Add support for the NAND flash controller found on NVIDIA
Tegra 2 SoCs. This implementation does not make use of the
command queue feature. Regular operations/data transfers are
done in PIO mode. Page read/writes with hardware ECC make
use of the DMA for data transfer.
Signed-off-by: Lucas Stach <[email protected]>
Signed-off-by: Stefan Agner <[email protected]>
---
MAINTAINERS | 7 +
drivers/mtd/nand/raw/Kconfig | 6 +
drivers/mtd/nand/raw/Makefile | 1 +
drivers/mtd/nand/raw/tegra_nand.c | 999 ++++++++++++++++++++++++++++++
4 files changed, 1013 insertions(+)
create mode 100644 drivers/mtd/nand/raw/tegra_nand.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 58b9861ccf99..8cbbb7111742 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -13844,6 +13844,13 @@ M: Laxman Dewangan <[email protected]>
S: Supported
F: drivers/input/keyboard/tegra-kbc.c
+TEGRA NAND DRIVER
+M: Stefan Agner <[email protected]>
+M: Lucas Stach <[email protected]>
+S: Maintained
+F: Documentation/devicetree/bindings/mtd/nvidia,tegra20-nand.txt
+F: drivers/mtd/nand/raw/tegra_nand.c
+
TEGRA PWM DRIVER
M: Thierry Reding <[email protected]>
S: Supported
diff --git a/drivers/mtd/nand/raw/Kconfig b/drivers/mtd/nand/raw/Kconfig
index 19a2b283fbbe..012c63c6ab47 100644
--- a/drivers/mtd/nand/raw/Kconfig
+++ b/drivers/mtd/nand/raw/Kconfig
@@ -534,4 +534,10 @@ config MTD_NAND_MTK
Enables support for NAND controller on MTK SoCs.
This controller is found on mt27xx, mt81xx, mt65xx SoCs.
+config MTD_NAND_TEGRA
+ tristate "Support for NAND on NVIDIA Tegra"
+ depends on ARCH_TEGRA || COMPILE_TEST
+ help
+ Enables support for NAND flash on NVIDIA Tegra SoC based boards.
+
endif # MTD_NAND
diff --git a/drivers/mtd/nand/raw/Makefile b/drivers/mtd/nand/raw/Makefile
index 165b7ef9e9a1..d5a5f9832b88 100644
--- a/drivers/mtd/nand/raw/Makefile
+++ b/drivers/mtd/nand/raw/Makefile
@@ -56,6 +56,7 @@ obj-$(CONFIG_MTD_NAND_HISI504) += hisi504_nand.o
obj-$(CONFIG_MTD_NAND_BRCMNAND) += brcmnand/
obj-$(CONFIG_MTD_NAND_QCOM) += qcom_nandc.o
obj-$(CONFIG_MTD_NAND_MTK) += mtk_ecc.o mtk_nand.o
+obj-$(CONFIG_MTD_NAND_TEGRA) += tegra_nand.o
nand-objs := nand_base.o nand_bbt.o nand_timings.o nand_ids.o
nand-objs += nand_amd.o
diff --git a/drivers/mtd/nand/raw/tegra_nand.c b/drivers/mtd/nand/raw/tegra_nand.c
new file mode 100644
index 000000000000..1a0833d97472
--- /dev/null
+++ b/drivers/mtd/nand/raw/tegra_nand.c
@@ -0,0 +1,999 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2018 Stefan Agner <[email protected]>
+ * Copyright (C) 2014-2015 Lucas Stach <[email protected]>
+ * Copyright (C) 2012 Avionic Design GmbH
+ */
+
+#include <linux/clk.h>
+#include <linux/completion.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/err.h>
+#include <linux/gpio/consumer.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/mtd/partitions.h>
+#include <linux/mtd/rawnand.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/reset.h>
+
+#define CMD 0x00
+#define CMD_GO (1 << 31)
+#define CMD_CLE (1 << 30)
+#define CMD_ALE (1 << 29)
+#define CMD_PIO (1 << 28)
+#define CMD_TX (1 << 27)
+#define CMD_RX (1 << 26)
+#define CMD_SEC_CMD (1 << 25)
+#define CMD_AFT_DAT (1 << 24)
+#define CMD_TRANS_SIZE(x) (((x - 1) & 0xf) << 20)
+#define CMD_A_VALID (1 << 19)
+#define CMD_B_VALID (1 << 18)
+#define CMD_RD_STATUS_CHK (1 << 17)
+#define CMD_RBSY_CHK (1 << 16)
+#define CMD_CE(x) (1 << (8 + ((x) & 0x7)))
+#define CMD_CLE_SIZE(x) (((x - 1) & 0x3) << 4)
+#define CMD_ALE_SIZE(x) (((x - 1) & 0xf) << 0)
+
+#define STATUS 0x04
+
+#define ISR 0x08
+#define ISR_CORRFAIL_ERR (1 << 24)
+#define ISR_UND (1 << 7)
+#define ISR_OVR (1 << 6)
+#define ISR_CMD_DONE (1 << 5)
+#define ISR_ECC_ERR (1 << 4)
+
+#define IER 0x0c
+#define IER_ERR_TRIG_VAL(x) (((x) & 0xf) << 16)
+#define IER_UND (1 << 7)
+#define IER_OVR (1 << 6)
+#define IER_CMD_DONE (1 << 5)
+#define IER_ECC_ERR (1 << 4)
+#define IER_GIE (1 << 0)
+
+#define CFG 0x10
+#define CFG_HW_ECC (1 << 31)
+#define CFG_ECC_SEL (1 << 30)
+#define CFG_ERR_COR (1 << 29)
+#define CFG_PIPE_EN (1 << 28)
+#define CFG_TVAL_4 (0 << 24)
+#define CFG_TVAL_6 (1 << 24)
+#define CFG_TVAL_8 (2 << 24)
+#define CFG_SKIP_SPARE (1 << 23)
+#define CFG_BUS_WIDTH_8 (0 << 21)
+#define CFG_BUS_WIDTH_16 (1 << 21)
+#define CFG_COM_BSY (1 << 20)
+#define CFG_PS_256 (0 << 16)
+#define CFG_PS_512 (1 << 16)
+#define CFG_PS_1024 (2 << 16)
+#define CFG_PS_2048 (3 << 16)
+#define CFG_PS_4096 (4 << 16)
+#define CFG_SKIP_SPARE_SIZE_4 (0 << 14)
+#define CFG_SKIP_SPARE_SIZE_8 (1 << 14)
+#define CFG_SKIP_SPARE_SIZE_12 (2 << 14)
+#define CFG_SKIP_SPARE_SIZE_16 (3 << 14)
+#define CFG_TAG_BYTE_SIZE(x) ((x) & 0xff)
+
+#define TIMING_1 0x14
+#define TIMING_TRP_RESP(x) (((x) & 0xf) << 28)
+#define TIMING_TWB(x) (((x) & 0xf) << 24)
+#define TIMING_TCR_TAR_TRR(x) (((x) & 0xf) << 20)
+#define TIMING_TWHR(x) (((x) & 0xf) << 16)
+#define TIMING_TCS(x) (((x) & 0x3) << 14)
+#define TIMING_TWH(x) (((x) & 0x3) << 12)
+#define TIMING_TWP(x) (((x) & 0xf) << 8)
+#define TIMING_TRH(x) (((x) & 0xf) << 4)
+#define TIMING_TRP(x) (((x) & 0xf) << 0)
+
+#define RESP 0x18
+
+#define TIMING_2 0x1c
+#define TIMING_TADL(x) ((x) & 0xf)
+
+#define CMD_1 0x20
+#define CMD_2 0x24
+#define ADDR_1 0x28
+#define ADDR_2 0x2c
+
+#define DMA_CTRL 0x30
+#define DMA_CTRL_GO (1 << 31)
+#define DMA_CTRL_IN (0 << 30)
+#define DMA_CTRL_OUT (1 << 30)
+#define DMA_CTRL_PERF_EN (1 << 29)
+#define DMA_CTRL_IE_DONE (1 << 28)
+#define DMA_CTRL_REUSE (1 << 27)
+#define DMA_CTRL_BURST_1 (2 << 24)
+#define DMA_CTRL_BURST_4 (3 << 24)
+#define DMA_CTRL_BURST_8 (4 << 24)
+#define DMA_CTRL_BURST_16 (5 << 24)
+#define DMA_CTRL_IS_DONE (1 << 20)
+#define DMA_CTRL_EN_A (1 << 2)
+#define DMA_CTRL_EN_B (1 << 1)
+
+#define DMA_CFG_A 0x34
+#define DMA_CFG_B 0x38
+
+#define FIFO_CTRL 0x3c
+#define FIFO_CTRL_CLR_ALL (1 << 3)
+
+#define DATA_PTR 0x40
+#define TAG_PTR 0x44
+#define ECC_PTR 0x48
+
+#define DEC_STATUS 0x4c
+#define DEC_STATUS_A_ECC_FAIL (1 << 1)
+#define DEC_STATUS_ERR_COUNT_MASK 0x00ff0000
+#define DEC_STATUS_ERR_COUNT_SHIFT 16
+
+#define HWSTATUS_CMD 0x50
+#define HWSTATUS_MASK 0x54
+#define HWSTATUS_RDSTATUS_MASK(x) (((x) & 0xff) << 24)
+#define HWSTATUS_RDSTATUS_VALUE(x) (((x) & 0xff) << 16)
+#define HWSTATUS_RBSY_MASK(x) (((x) & 0xff) << 8)
+#define HWSTATUS_RBSY_VALUE(x) (((x) & 0xff) << 0)
+
+#define BCH_CONFIG 0xcc
+#define BCH_ENABLE (1 << 0)
+#define BCH_TVAL_4 (0 << 4)
+#define BCH_TVAL_8 (1 << 4)
+#define BCH_TVAL_14 (2 << 4)
+#define BCH_TVAL_16 (3 << 4)
+
+#define DEC_STAT_RESULT 0xd0
+#define DEC_STAT_BUF 0xd4
+#define DEC_STAT_BUF_FAIL_SEC_FLAG_MASK 0xff000000
+#define DEC_STAT_BUF_FAIL_SEC_FLAG_SHIFT 24
+#define DEC_STAT_BUF_CORR_SEC_FLAG_MASK 0x00ff0000
+#define DEC_STAT_BUF_CORR_SEC_FLAG_SHIFT 16
+#define DEC_STAT_BUF_MAX_CORR_CNT_MASK 0x00001f00
+#define DEC_STAT_BUF_MAX_CORR_CNT_SHIFT 8
+
+#define SKIP_SPARE_BYTES 4
+#define BITS_PER_STEP_RS 18
+#define BITS_PER_STEP_BCH 13
+
+struct tegra_nand_controller {
+ struct nand_hw_control controller;
+ void __iomem *regs;
+ struct clk *clk;
+ struct device *dev;
+ struct completion command_complete;
+ struct completion dma_complete;
+ bool last_read_error;
+ int cur_chip;
+ struct nand_chip *chip;
+};
+
+struct tegra_nand_chip {
+ struct nand_chip chip;
+ struct gpio_desc *wp_gpio;
+};
+
+static inline struct tegra_nand_controller *to_tegra_ctrl(
+ struct nand_hw_control *hw_ctrl)
+{
+ return container_of(hw_ctrl, struct tegra_nand_controller, controller);
+}
+
+static int tegra_nand_ooblayout_rs_ecc(struct mtd_info *mtd, int section,
+ struct mtd_oob_region *oobregion)
+{
+ struct nand_chip *chip = mtd_to_nand(mtd);
+ int bytes_per_step = (BITS_PER_STEP_RS * chip->ecc.strength) / 8;
+
+ if (section > 0)
+ return -ERANGE;
+
+ oobregion->offset = SKIP_SPARE_BYTES;
+ oobregion->length = round_up(bytes_per_step * chip->ecc.steps, 4);
+
+ return 0;
+}
+
+static int tegra_nand_ooblayout_rs_free(struct mtd_info *mtd, int section,
+ struct mtd_oob_region *oobregion)
+{
+ struct nand_chip *chip = mtd_to_nand(mtd);
+ int bytes_per_step = DIV_ROUND_UP(BITS_PER_STEP_RS * chip->ecc.strength, 8);
+
+ if (section > 0)
+ return -ERANGE;
+
+ oobregion->offset = SKIP_SPARE_BYTES +
+ round_up(bytes_per_step * chip->ecc.steps, 4);
+ oobregion->length = mtd->oobsize - oobregion->offset;
+
+ return 0;
+}
+
+static const struct mtd_ooblayout_ops tegra_nand_oob_rs_ops = {
+ .ecc = tegra_nand_ooblayout_rs_ecc,
+ .free = tegra_nand_ooblayout_rs_free,
+};
+
+static int tegra_nand_ooblayout_bch_ecc(struct mtd_info *mtd, int section,
+ struct mtd_oob_region *oobregion)
+{
+ struct nand_chip *chip = mtd_to_nand(mtd);
+ int bytes_per_step = DIV_ROUND_UP(BITS_PER_STEP_BCH * chip->ecc.strength, 8);
+
+ if (section > 0)
+ return -ERANGE;
+
+ oobregion->offset = SKIP_SPARE_BYTES;
+ oobregion->length = round_up(bytes_per_step * chip->ecc.steps, 4);
+
+ return 0;
+}
+
+static int tegra_nand_ooblayout_bch_free(struct mtd_info *mtd, int section,
+ struct mtd_oob_region *oobregion)
+{
+ struct nand_chip *chip = mtd_to_nand(mtd);
+ int bytes_per_step = (BITS_PER_STEP_BCH * chip->ecc.strength) / 8;
+
+ if (section > 0)
+ return -ERANGE;
+
+ oobregion->offset = SKIP_SPARE_BYTES +
+ round_up(bytes_per_step * chip->ecc.steps, 4);
+ oobregion->length = mtd->oobsize - oobregion->offset;
+
+ return 0;
+}
+
+/*
+ * Layout with tag bytes is
+ *
+ * --------------------------------------------------------------------------
+ * | main area | skip bytes | tag bytes | parity | .. |
+ * --------------------------------------------------------------------------
+ *
+ * If not tag bytes are written, parity moves right after skip bytes!
+ */
+static const struct mtd_ooblayout_ops tegra_nand_oob_bch_ops = {
+ .ecc = tegra_nand_ooblayout_bch_ecc,
+ .free = tegra_nand_ooblayout_bch_free,
+};
+
+static irqreturn_t tegra_nand_irq(int irq, void *data)
+{
+ struct tegra_nand_controller *ctrl = data;
+ u32 isr, dma;
+
+ isr = readl_relaxed(ctrl->regs + ISR);
+ dma = readl_relaxed(ctrl->regs + DMA_CTRL);
+ dev_dbg(ctrl->dev, "isr %08x\n", isr);
+
+ if (!isr && !(dma & DMA_CTRL_IS_DONE))
+ return IRQ_NONE;
+
+ if (isr & ISR_CORRFAIL_ERR)
+ ctrl->last_read_error = true;
+
+ if (isr & ISR_CMD_DONE)
+ complete(&ctrl->command_complete);
+
+ if (isr & ISR_UND)
+ dev_dbg(ctrl->dev, "FIFO underrun\n");
+
+ if (isr & ISR_OVR)
+ dev_dbg(ctrl->dev, "FIFO overrun\n");
+
+ /* handle DMA interrupts */
+ if (dma & DMA_CTRL_IS_DONE) {
+ writel(dma, ctrl->regs + DMA_CTRL);
+ complete(&ctrl->dma_complete);
+ }
+
+ /* clear interrupts */
+ writel(isr, ctrl->regs + ISR);
+
+ return IRQ_HANDLED;
+}
+
+static int tegra_nand_cmd(struct nand_chip *chip,
+ const struct nand_subop *subop)
+{
+ const struct nand_op_instr *instr;
+ const struct nand_op_instr *instr_data_in = NULL;
+ struct tegra_nand_controller *ctrl = to_tegra_ctrl(chip->controller);
+ unsigned int op_id = -1, trfr_in_sz = 0, trfr_out_sz = 0, offset = 0;
+ bool first_cmd = true;
+ u32 cmd = 0;
+ u32 value;
+
+ for (op_id = 0; op_id < subop->ninstrs; op_id++) {
+ unsigned int naddrs, i;
+ const u8 *addrs;
+ u32 addr1 = 0, addr2 = 0;
+
+ instr = &subop->instrs[op_id];
+
+ switch (instr->type) {
+ case NAND_OP_CMD_INSTR:
+ if (first_cmd) {
+ cmd |= CMD_CLE;
+ writel(instr->ctx.cmd.opcode, ctrl->regs + CMD_1);
+ } else {
+ cmd |= CMD_SEC_CMD;
+ writel(instr->ctx.cmd.opcode, ctrl->regs + CMD_2);
+ }
+ first_cmd = false;
+ break;
+ case NAND_OP_ADDR_INSTR:
+ offset = nand_subop_get_addr_start_off(subop, op_id);
+ naddrs = nand_subop_get_num_addr_cyc(subop, op_id);
+ addrs = &instr->ctx.addr.addrs[offset];
+
+ cmd |= CMD_ALE | CMD_ALE_SIZE(naddrs);
+ for (i = 0; i < min_t(unsigned int, 4, naddrs); i++)
+ addr1 |= *addrs++ << (8 * i);
+ naddrs -= i;
+ for (i = 0; i < min_t(unsigned int, 4, naddrs); i++)
+ addr2 |= *addrs++ << (8 * i);
+ writel(addr1, ctrl->regs + ADDR_1);
+ writel(addr2, ctrl->regs + ADDR_2);
+ break;
+
+ case NAND_OP_DATA_IN_INSTR:
+ trfr_in_sz = nand_subop_get_data_len(subop, op_id);
+ offset = nand_subop_get_data_start_off(subop, op_id);
+
+ cmd |= CMD_TRANS_SIZE(trfr_in_sz) | CMD_PIO | CMD_RX | CMD_A_VALID;
+
+ instr_data_in = instr;
+ break;
+
+ case NAND_OP_DATA_OUT_INSTR:
+ trfr_out_sz = nand_subop_get_data_len(subop, op_id);
+ offset = nand_subop_get_data_start_off(subop, op_id);
+ trfr_out_sz = min_t(size_t, trfr_out_sz, 4);
+
+ cmd |= CMD_TRANS_SIZE(trfr_out_sz) | CMD_PIO | CMD_TX | CMD_A_VALID;
+
+ memcpy(&value, instr->ctx.data.buf.out + offset, trfr_out_sz);
+ writel(value, ctrl->regs + RESP);
+
+ break;
+ case NAND_OP_WAITRDY_INSTR:
+ cmd |= CMD_RBSY_CHK;
+ break;
+
+ }
+ }
+
+
+ cmd |= CMD_GO | CMD_CE(ctrl->cur_chip);
+ writel(cmd, ctrl->regs + CMD);
+ wait_for_completion(&ctrl->command_complete);
+
+ if (instr_data_in) {
+ u32 value;
+ size_t n = min_t(size_t, trfr_in_sz, 4);
+
+ value = readl(ctrl->regs + RESP);
+ memcpy(instr_data_in->ctx.data.buf.in + offset, &value, n);
+ }
+
+ return 0;
+}
+
+static const struct nand_op_parser tegra_nand_op_parser = NAND_OP_PARSER(
+ NAND_OP_PARSER_PATTERN(tegra_nand_cmd,
+ NAND_OP_PARSER_PAT_CMD_ELEM(true),
+ NAND_OP_PARSER_PAT_ADDR_ELEM(true, 8),
+ NAND_OP_PARSER_PAT_CMD_ELEM(true),
+ NAND_OP_PARSER_PAT_WAITRDY_ELEM(true)),
+ NAND_OP_PARSER_PATTERN(tegra_nand_cmd,
+ NAND_OP_PARSER_PAT_DATA_OUT_ELEM(false, 4)),
+ NAND_OP_PARSER_PATTERN(tegra_nand_cmd,
+ NAND_OP_PARSER_PAT_CMD_ELEM(true),
+ NAND_OP_PARSER_PAT_ADDR_ELEM(true, 8),
+ NAND_OP_PARSER_PAT_CMD_ELEM(true),
+ NAND_OP_PARSER_PAT_WAITRDY_ELEM(true),
+ NAND_OP_PARSER_PAT_DATA_IN_ELEM(true, 4)),
+ );
+
+static int tegra_nand_exec_op(struct nand_chip *chip,
+ const struct nand_operation *op,
+ bool check_only)
+{
+ return nand_op_parser_exec_op(chip, &tegra_nand_op_parser, op,
+ check_only);
+}
+static void tegra_nand_select_chip(struct mtd_info *mtd, int chip_nr)
+{
+ struct nand_chip *chip = mtd_to_nand(mtd);
+ struct tegra_nand_controller *ctrl = to_tegra_ctrl(chip->controller);
+
+ ctrl->cur_chip = chip_nr;
+}
+
+static u32 tegra_nand_fill_address(struct tegra_nand_controller *ctrl,
+ struct nand_chip *chip, int page)
+{
+ /* Lower 16-bits are column, always 0 */
+ writel(page << 16, ctrl->regs + ADDR_1);
+
+ if (chip->options & NAND_ROW_ADDR_3) {
+ writel(page >> 16, ctrl->regs + ADDR_2);
+ return 5;
+ }
+
+ return 4;
+}
+
+static void tegra_nand_hw_ecc(struct tegra_nand_controller *ctrl,
+ struct nand_chip *chip, bool enable)
+{
+ u32 value;
+
+ switch (chip->ecc.algo) {
+ case NAND_ECC_RS:
+ value = readl(ctrl->regs + CFG);
+ if (enable)
+ value |= CFG_HW_ECC | CFG_ERR_COR;
+ else
+ value &= ~(CFG_HW_ECC | CFG_ERR_COR);
+ writel(value, ctrl->regs + CFG);
+ break;
+ case NAND_ECC_BCH:
+ value = readl(ctrl->regs + BCH_CONFIG);
+ if (enable)
+ value |= BCH_ENABLE;
+ else
+ value &= ~BCH_ENABLE;
+ writel(value, ctrl->regs + BCH_CONFIG);
+ break;
+ default:
+ dev_err(ctrl->dev, "Unsupported hardware ECC algorithm\n");
+ break;
+ }
+}
+
+static int tegra_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
+ uint8_t *buf, int oob_required, int page)
+{
+ struct tegra_nand_controller *ctrl = to_tegra_ctrl(chip->controller);
+ dma_addr_t dma_addr;
+ u32 value, addrs;
+ int ret, dma_len;
+
+ writel(NAND_CMD_READ0, ctrl->regs + CMD_1);
+ writel(NAND_CMD_READSTART, ctrl->regs + CMD_2);
+
+ addrs = tegra_nand_fill_address(ctrl, chip, page);
+
+ dma_len = mtd->writesize + (oob_required ? mtd->oobsize : 0);
+ dma_addr = dma_map_single(ctrl->dev, buf, dma_len, DMA_FROM_DEVICE);
+ ret = dma_mapping_error(ctrl->dev, dma_addr);
+ if (ret) {
+ dev_err(ctrl->dev, "dma mapping error\n");
+ return -EINVAL;
+ }
+
+ writel(mtd->writesize - 1, ctrl->regs + DMA_CFG_A);
+ writel(dma_addr, ctrl->regs + DATA_PTR);
+
+ if (oob_required) {
+ struct mtd_oob_region oobregion;
+ dma_addr_t dma_addr_oob = dma_addr + mtd->writesize;
+
+ mtd_ooblayout_free(mtd, 0, &oobregion);
+
+ writel(oobregion.length - 1, ctrl->regs + DMA_CFG_B);
+ writel(dma_addr_oob + oobregion.offset, ctrl->regs + TAG_PTR);
+ } else {
+ writel(0, ctrl->regs + DMA_CFG_B);
+ writel(0, ctrl->regs + TAG_PTR);
+ }
+
+ value = DMA_CTRL_GO | DMA_CTRL_IN | DMA_CTRL_PERF_EN |
+ DMA_CTRL_REUSE | DMA_CTRL_IE_DONE | DMA_CTRL_IS_DONE |
+ DMA_CTRL_BURST_16 | DMA_CTRL_EN_A;
+ if (oob_required)
+ value |= DMA_CTRL_EN_B;
+ writel(value, ctrl->regs + DMA_CTRL);
+
+ value = CMD_CLE | CMD_ALE | CMD_ALE_SIZE(addrs) | CMD_SEC_CMD |
+ CMD_RBSY_CHK | CMD_GO | CMD_RX | CMD_TRANS_SIZE(9) |
+ CMD_A_VALID | CMD_CE(ctrl->cur_chip);
+ if (oob_required)
+ value |= CMD_B_VALID;
+ writel(value, ctrl->regs + CMD);
+
+ wait_for_completion(&ctrl->command_complete);
+ wait_for_completion(&ctrl->dma_complete);
+
+ dma_unmap_single(ctrl->dev, dma_addr, dma_len, DMA_FROM_DEVICE);
+
+ return 0;
+}
+
+static int tegra_nand_read_page_hwecc(struct mtd_info *mtd,
+ struct nand_chip *chip,
+ uint8_t *buf, int oob_required, int page)
+{
+ struct tegra_nand_controller *ctrl = to_tegra_ctrl(chip->controller);
+ u32 value;
+ int ret;
+
+ tegra_nand_hw_ecc(ctrl, chip, true);
+ ret = tegra_nand_read_page(mtd, chip, buf, oob_required, page);
+ tegra_nand_hw_ecc(ctrl, chip, false);
+ if (ret)
+ return ret;
+
+ /* If no correctable or un-correctable errors occured we can return 0 */
+ if (!ctrl->last_read_error)
+ return 0;
+
+ /*
+ * Correctable or un-correctable errors did occure. NAND dec status
+ * contains information for all ECC selections
+ */
+ ctrl->last_read_error = false;
+ value = readl(ctrl->regs + DEC_STAT_BUF);
+
+ if (value & DEC_STAT_BUF_FAIL_SEC_FLAG_MASK) {
+ /*
+ * The ECC isn't smart enough to figure out if a page is
+ * completely erased and flags an error in this case. So we
+ * check the read data here to figure out if it's a legitimate
+ * error or a false positive.
+ */
+ int i, ret;
+ int flips_threshold = chip->ecc.strength / 2;
+ int max_bitflips = 0;
+
+ for (i = 0; i < chip->ecc.steps; i++) {
+ u8 *data = buf + (chip->ecc.size * i);
+
+ ret = nand_check_erased_ecc_chunk(data, chip->ecc.size,
+ NULL, 0,
+ NULL, 0,
+ flips_threshold);
+ if (ret < 0)
+ mtd->ecc_stats.failed++;
+ else
+ max_bitflips = max(ret, max_bitflips);
+ }
+
+ return max_bitflips;
+ } else {
+ int max_corr_cnt, corr_sec_flag;
+
+ corr_sec_flag = (value & DEC_STAT_BUF_CORR_SEC_FLAG_MASK) >>
+ DEC_STAT_BUF_CORR_SEC_FLAG_SHIFT;
+ max_corr_cnt = (value & DEC_STAT_BUF_MAX_CORR_CNT_MASK) >>
+ DEC_STAT_BUF_MAX_CORR_CNT_SHIFT;
+
+ /*
+ * The value returned in the register is the maximum of
+ * bitflips encountered in any of the ECC regions. As there is
+ * no way to get the number of bitflips in a specific regions
+ * we are not able to deliver correct stats but instead
+ * overestimate the number of corrected bitflips by assuming
+ * that all regions where errors have been corrected
+ * encountered the maximum number of bitflips.
+ */
+ mtd->ecc_stats.corrected += max_corr_cnt * hweight8(corr_sec_flag);
+
+ return max_corr_cnt;
+ }
+
+}
+
+static int tegra_nand_write_page(struct mtd_info *mtd, struct nand_chip *chip,
+ const uint8_t *buf, int oob_required, int page)
+{
+ struct tegra_nand_controller *ctrl = to_tegra_ctrl(chip->controller);
+ dma_addr_t dma_addr;
+ u32 value, addrs;
+ int ret, dma_len;
+
+ writel(NAND_CMD_SEQIN, ctrl->regs + CMD_1);
+ writel(NAND_CMD_PAGEPROG, ctrl->regs + CMD_2);
+
+ addrs = tegra_nand_fill_address(ctrl, chip, page);
+
+ dma_len = mtd->writesize + (oob_required ? mtd->oobsize : 0);
+ dma_addr = dma_map_single(ctrl->dev, (void *)buf, dma_len, DMA_TO_DEVICE);
+ ret = dma_mapping_error(ctrl->dev, dma_addr);
+ if (ret) {
+ dev_err(ctrl->dev, "dma mapping error\n");
+ return -EINVAL;
+ }
+
+ writel(mtd->writesize - 1, ctrl->regs + DMA_CFG_A);
+ writel(dma_addr, ctrl->regs + DATA_PTR);
+
+ if (oob_required) {
+ struct mtd_oob_region oobregion;
+ dma_addr_t dma_addr_oob = dma_addr + mtd->writesize;
+
+ mtd_ooblayout_free(mtd, 0, &oobregion);
+
+ writel(oobregion.length - 1, ctrl->regs + DMA_CFG_B);
+ writel(dma_addr_oob + oobregion.offset, ctrl->regs + TAG_PTR);
+ } else {
+ writel(0, ctrl->regs + DMA_CFG_B);
+ writel(0, ctrl->regs + TAG_PTR);
+ }
+
+ value = DMA_CTRL_GO | DMA_CTRL_OUT | DMA_CTRL_PERF_EN |
+ DMA_CTRL_IE_DONE | DMA_CTRL_IS_DONE |
+ DMA_CTRL_BURST_16 | DMA_CTRL_EN_A;
+ if (oob_required)
+ value |= DMA_CTRL_EN_B;
+ writel(value, ctrl->regs + DMA_CTRL);
+
+ value = CMD_CLE | CMD_ALE | CMD_ALE_SIZE(addrs) | CMD_SEC_CMD |
+ CMD_AFT_DAT | CMD_RBSY_CHK | CMD_GO | CMD_TX | CMD_A_VALID |
+ CMD_TRANS_SIZE(9) | CMD_CE(ctrl->cur_chip);
+ if (oob_required)
+ value |= CMD_B_VALID;
+ writel(value, ctrl->regs + CMD);
+
+ wait_for_completion(&ctrl->command_complete);
+ wait_for_completion(&ctrl->dma_complete);
+
+
+ dma_unmap_single(ctrl->dev, dma_addr, dma_len, DMA_TO_DEVICE);
+
+ return 0;
+}
+
+static int tegra_nand_write_page_hwecc(struct mtd_info *mtd,
+ struct nand_chip *chip,
+ const uint8_t *buf, int oob_required,
+ int page)
+{
+ struct tegra_nand_controller *ctrl = to_tegra_ctrl(chip->controller);
+ int ret;
+
+ tegra_nand_hw_ecc(ctrl, chip, true);
+ ret = tegra_nand_write_page(mtd, chip, buf, oob_required, page);
+ tegra_nand_hw_ecc(ctrl, chip, false);
+
+ return ret;
+}
+
+static void tegra_nand_setup_timing(struct tegra_nand_controller *ctrl,
+ const struct nand_sdr_timings *timings)
+{
+ /*
+ * The period (and all other timings in this function) is in ps,
+ * so need to take care here to avoid integer overflows.
+ */
+ unsigned int rate = clk_get_rate(ctrl->clk) / 1000000;
+ unsigned int period = DIV_ROUND_UP(1000000, rate);
+ u32 val, reg = 0;
+
+ val = DIV_ROUND_UP(max3(timings->tAR_min, timings->tRR_min,
+ timings->tRC_min), period);
+ if (val > 2)
+ val -= 3;
+ reg |= TIMING_TCR_TAR_TRR(val);
+
+ val = DIV_ROUND_UP(max(max(timings->tCS_min, timings->tCH_min),
+ max(timings->tALS_min, timings->tALH_min)),
+ period);
+ if (val > 1)
+ val -= 2;
+ reg |= TIMING_TCS(val);
+
+ val = DIV_ROUND_UP(max(timings->tRP_min, timings->tREA_max) + 6000,
+ period);
+ reg |= TIMING_TRP(val) | TIMING_TRP_RESP(val);
+
+ reg |= TIMING_TWB(DIV_ROUND_UP(timings->tWB_max, period));
+ reg |= TIMING_TWHR(DIV_ROUND_UP(timings->tWHR_min, period));
+ reg |= TIMING_TWH(DIV_ROUND_UP(timings->tWH_min, period));
+ reg |= TIMING_TWP(DIV_ROUND_UP(timings->tWP_min, period));
+ reg |= TIMING_TRH(DIV_ROUND_UP(timings->tRHW_min, period));
+
+ writel(reg, ctrl->regs + TIMING_1);
+
+ val = DIV_ROUND_UP(timings->tADL_min, period);
+ if (val > 2)
+ val -= 3;
+ reg = TIMING_TADL(val);
+
+ writel(reg, ctrl->regs + TIMING_2);
+}
+
+static int tegra_nand_setup_data_interface(struct mtd_info *mtd, int csline,
+ const struct nand_data_interface *conf)
+{
+ struct nand_chip *chip = mtd_to_nand(mtd);
+ struct tegra_nand_controller *ctrl = to_tegra_ctrl(chip->controller);
+ const struct nand_sdr_timings *timings;
+
+ timings = nand_get_sdr_timings(conf);
+ if (IS_ERR(timings))
+ return PTR_ERR(timings);
+
+ if (csline == NAND_DATA_IFACE_CHECK_ONLY)
+ return 0;
+
+ tegra_nand_setup_timing(ctrl, timings);
+
+ return 0;
+}
+
+static int tegra_nand_chips_init(struct device *dev,
+ struct tegra_nand_controller *ctrl)
+{
+ struct device_node *np = dev->of_node;
+ struct device_node *np_nand;
+ int nchips = of_get_child_count(np);
+ struct tegra_nand_chip *nand;
+ struct mtd_info *mtd;
+ struct nand_chip *chip;
+ unsigned long config, bch_config = 0;
+ int bits_per_step;
+ int err;
+
+ if (nchips != 1) {
+ dev_err(dev, "currently only one NAND chip supported\n");
+ return -EINVAL;
+ }
+
+ np_nand = of_get_next_child(np, NULL);
+
+ nand = devm_kzalloc(dev, sizeof(*nand), GFP_KERNEL);
+ if (!nand) {
+ dev_err(dev, "could not allocate chip structure\n");
+ return -ENOMEM;
+ }
+
+ nand->wp_gpio = devm_gpiod_get_optional(dev, "wp", GPIOD_OUT_LOW);
+
+ if (IS_ERR(nand->wp_gpio)) {
+ err = PTR_ERR(nand->wp_gpio);
+ dev_err(dev, "failed to request WP GPIO: %d\n", err);
+ return err;
+ }
+
+ chip = &nand->chip;
+ chip->controller = &ctrl->controller;
+ ctrl->chip = chip;
+
+ mtd = nand_to_mtd(chip);
+
+ mtd->dev.parent = dev;
+ mtd->name = "tegra_nand";
+ mtd->owner = THIS_MODULE;
+
+ nand_set_flash_node(chip, np_nand);
+
+ chip->options = NAND_NO_SUBPAGE_WRITE | NAND_USE_BOUNCE_BUFFER;
+ chip->exec_op = tegra_nand_exec_op;
+ chip->select_chip = tegra_nand_select_chip;
+ chip->setup_data_interface = tegra_nand_setup_data_interface;
+
+ err = nand_scan_ident(mtd, 1, NULL);
+ if (err)
+ return err;
+
+ if (chip->bbt_options & NAND_BBT_USE_FLASH)
+ chip->bbt_options |= NAND_BBT_NO_OOB;
+
+ chip->ecc.mode = NAND_ECC_HW;
+ if (!chip->ecc.size)
+ chip->ecc.size = 512;
+ if (chip->ecc.size != 512)
+ return -EINVAL;
+
+ chip->ecc.read_page = tegra_nand_read_page_hwecc;
+ chip->ecc.write_page = tegra_nand_write_page_hwecc;
+ /* Not functional for unknown reason...
+ chip->ecc.read_page_raw = tegra_nand_read_page;
+ chip->ecc.write_page_raw = tegra_nand_write_page;
+ */
+ config = readl(ctrl->regs + CFG);
+ config |= CFG_PIPE_EN | CFG_SKIP_SPARE | CFG_SKIP_SPARE_SIZE_4;
+
+ if (chip->options & NAND_BUSWIDTH_16)
+ config |= CFG_BUS_WIDTH_16;
+
+ switch (chip->ecc.algo) {
+ case NAND_ECC_RS:
+ bits_per_step = BITS_PER_STEP_RS * chip->ecc.strength;
+ mtd_set_ooblayout(mtd, &tegra_nand_oob_rs_ops);
+ switch (chip->ecc.strength) {
+ case 4:
+ config |= CFG_ECC_SEL | CFG_TVAL_4;
+ break;
+ case 6:
+ config |= CFG_ECC_SEL | CFG_TVAL_6;
+ break;
+ case 8:
+ config |= CFG_ECC_SEL | CFG_TVAL_8;
+ break;
+ default:
+ dev_err(dev, "ECC strength %d not supported\n",
+ chip->ecc.strength);
+ return -EINVAL;
+ }
+ break;
+ case NAND_ECC_BCH:
+ bits_per_step = BITS_PER_STEP_BCH * chip->ecc.strength;
+ mtd_set_ooblayout(mtd, &tegra_nand_oob_bch_ops);
+ switch (chip->ecc.strength) {
+ case 4:
+ bch_config = BCH_TVAL_4;
+ break;
+ case 8:
+ bch_config = BCH_TVAL_8;
+ break;
+ case 14:
+ bch_config = BCH_TVAL_14;
+ break;
+ case 16:
+ bch_config = BCH_TVAL_16;
+ break;
+ default:
+ dev_err(dev, "ECC strength %d not supported\n",
+ chip->ecc.strength);
+ return -EINVAL;
+ }
+ break;
+ default:
+ dev_err(dev, "ECC algorithm not supported\n");
+ return -EINVAL;
+ }
+
+ chip->ecc.bytes = DIV_ROUND_UP(bits_per_step, 8);
+
+ switch (mtd->writesize) {
+ case 256:
+ config |= CFG_PS_256;
+ break;
+ case 512:
+ config |= CFG_PS_512;
+ break;
+ case 1024:
+ config |= CFG_PS_1024;
+ break;
+ case 2048:
+ config |= CFG_PS_2048;
+ break;
+ case 4096:
+ config |= CFG_PS_4096;
+ break;
+ default:
+ dev_err(dev, "unhandled writesize %d\n", mtd->writesize);
+ return -ENODEV;
+ }
+
+ writel(config, ctrl->regs + CFG);
+ writel(bch_config, ctrl->regs + BCH_CONFIG);
+
+ err = nand_scan_tail(mtd);
+ if (err)
+ return err;
+
+ config |= CFG_TAG_BYTE_SIZE(mtd_ooblayout_count_freebytes(mtd) - 1);
+ writel(config, ctrl->regs + CFG);
+
+ err = mtd_device_register(mtd, NULL, 0);
+ if (err)
+ return err;
+
+ return 0;
+}
+
+static int tegra_nand_probe(struct platform_device *pdev)
+{
+ struct reset_control *rst;
+ struct tegra_nand_controller *ctrl;
+ struct resource *res;
+ unsigned long value;
+ int irq, err = 0;
+
+ ctrl = devm_kzalloc(&pdev->dev, sizeof(*ctrl), GFP_KERNEL);
+ if (!ctrl)
+ return -ENOMEM;
+
+ ctrl->dev = &pdev->dev;
+ nand_hw_control_init(&ctrl->controller);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ ctrl->regs = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(ctrl->regs))
+ return PTR_ERR(ctrl->regs);
+
+ rst = devm_reset_control_get(&pdev->dev, "nand");
+ if (IS_ERR(rst))
+ return PTR_ERR(rst);
+
+ ctrl->clk = devm_clk_get(&pdev->dev, "nand");
+ if (IS_ERR(ctrl->clk))
+ return PTR_ERR(ctrl->clk);
+
+ err = clk_prepare_enable(ctrl->clk);
+ if (err)
+ return err;
+
+ reset_control_reset(rst);
+
+ value = HWSTATUS_RDSTATUS_MASK(1) | HWSTATUS_RDSTATUS_VALUE(0) |
+ HWSTATUS_RBSY_MASK(NAND_STATUS_READY) |
+ HWSTATUS_RBSY_VALUE(NAND_STATUS_READY);
+ writel(NAND_CMD_STATUS, ctrl->regs + HWSTATUS_CMD);
+ writel(value, ctrl->regs + HWSTATUS_MASK);
+
+ init_completion(&ctrl->command_complete);
+ init_completion(&ctrl->dma_complete);
+
+ /* clear interrupts */
+ value = readl(ctrl->regs + ISR);
+ writel(value, ctrl->regs + ISR);
+
+ irq = platform_get_irq(pdev, 0);
+ err = devm_request_irq(&pdev->dev, irq, tegra_nand_irq, 0,
+ dev_name(&pdev->dev), ctrl);
+ if (err)
+ goto err_disable_clk;
+
+ writel(DMA_CTRL_IS_DONE, ctrl->regs + DMA_CTRL);
+
+ /* enable interrupts */
+ value = IER_UND | IER_OVR | IER_CMD_DONE | IER_ECC_ERR | IER_GIE;
+ writel(value, ctrl->regs + IER);
+
+ /* reset config */
+ writel(0, ctrl->regs + CFG);
+
+ err = tegra_nand_chips_init(ctrl->dev, ctrl);
+ if (err)
+ goto err_disable_clk;
+
+ platform_set_drvdata(pdev, ctrl);
+
+ return 0;
+
+err_disable_clk:
+ clk_disable_unprepare(ctrl->clk);
+ return err;
+}
+
+static int tegra_nand_remove(struct platform_device *pdev)
+{
+ struct tegra_nand_controller *ctrl = platform_get_drvdata(pdev);
+
+ nand_release(nand_to_mtd(ctrl->chip));
+
+ clk_disable_unprepare(ctrl->clk);
+
+ return 0;
+}
+
+static const struct of_device_id tegra_nand_of_match[] = {
+ { .compatible = "nvidia,tegra20-nand" },
+ { /* sentinel */ }
+};
+
+static struct platform_driver tegra_nand_driver = {
+ .driver = {
+ .name = "tegra-nand",
+ .of_match_table = tegra_nand_of_match,
+ },
+ .probe = tegra_nand_probe,
+ .remove = tegra_nand_remove,
+};
+module_platform_driver(tegra_nand_driver);
+
+MODULE_DESCRIPTION("NVIDIA Tegra NAND driver");
+MODULE_AUTHOR("Thierry Reding <[email protected]>");
+MODULE_AUTHOR("Lucas Stach <[email protected]>");
+MODULE_AUTHOR("Stefan Agner <[email protected]>");
+MODULE_LICENSE("GPL v2");
+MODULE_DEVICE_TABLE(of, tegra_nand_of_match);
--
2.17.0
Hi Stefan,
A few more comments here.
On Sun, 27 May 2018 23:54:39 +0200, Stefan Agner <[email protected]>
wrote:
> Add support for the NAND flash controller found on NVIDIA
> Tegra 2 SoCs. This implementation does not make use of the
> command queue feature. Regular operations/data transfers are
> done in PIO mode. Page read/writes with hardware ECC make
> use of the DMA for data transfer.
>
> Signed-off-by: Lucas Stach <[email protected]>
> Signed-off-by: Stefan Agner <[email protected]>
> ---
> MAINTAINERS | 7 +
> drivers/mtd/nand/raw/Kconfig | 6 +
> drivers/mtd/nand/raw/Makefile | 1 +
> drivers/mtd/nand/raw/tegra_nand.c | 999 ++++++++++++++++++++++++++++++
> 4 files changed, 1013 insertions(+)
> create mode 100644 drivers/mtd/nand/raw/tegra_nand.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 58b9861ccf99..8cbbb7111742 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -13844,6 +13844,13 @@ M: Laxman Dewangan <[email protected]>
> S: Supported
> F: drivers/input/keyboard/tegra-kbc.c
>
> +TEGRA NAND DRIVER
> +M: Stefan Agner <[email protected]>
> +M: Lucas Stach <[email protected]>
> +S: Maintained
> +F: Documentation/devicetree/bindings/mtd/nvidia,tegra20-nand.txt
I think most MTD bindings use '-' instead of ','. I don't have a
preference, it's just for coherence.
> +F: drivers/mtd/nand/raw/tegra_nand.c
> +
> TEGRA PWM DRIVER
> M: Thierry Reding <[email protected]>
> S: Supported
> diff --git a/drivers/mtd/nand/raw/Kconfig b/drivers/mtd/nand/raw/Kconfig
> index 19a2b283fbbe..012c63c6ab47 100644
> --- a/drivers/mtd/nand/raw/Kconfig
> +++ b/drivers/mtd/nand/raw/Kconfig
> @@ -534,4 +534,10 @@ config MTD_NAND_MTK
> Enables support for NAND controller on MTK SoCs.
> This controller is found on mt27xx, mt81xx, mt65xx SoCs.
>
> +config MTD_NAND_TEGRA
> + tristate "Support for NAND on NVIDIA Tegra"
> + depends on ARCH_TEGRA || COMPILE_TEST
> + help
> + Enables support for NAND flash on NVIDIA Tegra SoC based boards.
Please make the term "controller" appear because it's mostly a
controller driver that you're adding.
> +
> endif # MTD_NAND
> diff --git a/drivers/mtd/nand/raw/Makefile b/drivers/mtd/nand/raw/Makefile
> index 165b7ef9e9a1..d5a5f9832b88 100644
> --- a/drivers/mtd/nand/raw/Makefile
> +++ b/drivers/mtd/nand/raw/Makefile
> @@ -56,6 +56,7 @@ obj-$(CONFIG_MTD_NAND_HISI504) += hisi504_nand.o
> obj-$(CONFIG_MTD_NAND_BRCMNAND) += brcmnand/
> obj-$(CONFIG_MTD_NAND_QCOM) += qcom_nandc.o
> obj-$(CONFIG_MTD_NAND_MTK) += mtk_ecc.o mtk_nand.o
> +obj-$(CONFIG_MTD_NAND_TEGRA) += tegra_nand.o
>
> nand-objs := nand_base.o nand_bbt.o nand_timings.o nand_ids.o
> nand-objs += nand_amd.o
[...]
> +static int tegra_nand_setup_data_interface(struct mtd_info *mtd, int csline,
> + const struct nand_data_interface *conf)
> +{
> + struct nand_chip *chip = mtd_to_nand(mtd);
> + struct tegra_nand_controller *ctrl = to_tegra_ctrl(chip->controller);
> + const struct nand_sdr_timings *timings;
> +
> + timings = nand_get_sdr_timings(conf);
> + if (IS_ERR(timings))
> + return PTR_ERR(timings);
> +
> + if (csline == NAND_DATA_IFACE_CHECK_ONLY)
> + return 0;
> +
> + tegra_nand_setup_timing(ctrl, timings);
Is this indirection really needed?
> +
> + return 0;
> +}
> +
> +static int tegra_nand_chips_init(struct device *dev,
> + struct tegra_nand_controller *ctrl)
> +{
> + struct device_node *np = dev->of_node;
> + struct device_node *np_nand;
> + int nchips = of_get_child_count(np);
> + struct tegra_nand_chip *nand;
> + struct mtd_info *mtd;
> + struct nand_chip *chip;
> + unsigned long config, bch_config = 0;
> + int bits_per_step;
> + int err;
> +
> + if (nchips != 1) {
> + dev_err(dev, "currently only one NAND chip supported\n");
> + return -EINVAL;
> + }
> +
> + np_nand = of_get_next_child(np, NULL);
> +
> + nand = devm_kzalloc(dev, sizeof(*nand), GFP_KERNEL);
> + if (!nand) {
> + dev_err(dev, "could not allocate chip structure\n");
> + return -ENOMEM;
> + }
> +
> + nand->wp_gpio = devm_gpiod_get_optional(dev, "wp", GPIOD_OUT_LOW);
> +
> + if (IS_ERR(nand->wp_gpio)) {
> + err = PTR_ERR(nand->wp_gpio);
> + dev_err(dev, "failed to request WP GPIO: %d\n", err);
> + return err;
> + }
> +
> + chip = &nand->chip;
> + chip->controller = &ctrl->controller;
> + ctrl->chip = chip;
> +
> + mtd = nand_to_mtd(chip);
> +
> + mtd->dev.parent = dev;
> + mtd->name = "tegra_nand";
> + mtd->owner = THIS_MODULE;
> +
> + nand_set_flash_node(chip, np_nand);
> +
> + chip->options = NAND_NO_SUBPAGE_WRITE | NAND_USE_BOUNCE_BUFFER;
> + chip->exec_op = tegra_nand_exec_op;
> + chip->select_chip = tegra_nand_select_chip;
> + chip->setup_data_interface = tegra_nand_setup_data_interface;
> +
> + err = nand_scan_ident(mtd, 1, NULL);
> + if (err)
> + return err;
> +
> + if (chip->bbt_options & NAND_BBT_USE_FLASH)
> + chip->bbt_options |= NAND_BBT_NO_OOB;
> +
> + chip->ecc.mode = NAND_ECC_HW;
> + if (!chip->ecc.size)
> + chip->ecc.size = 512;
> + if (chip->ecc.size != 512)
> + return -EINVAL;
This is useless. You can force ecc.size to 512 and forget about the DT
property (please update the DT bindings).
> +
> + chip->ecc.read_page = tegra_nand_read_page_hwecc;
> + chip->ecc.write_page = tegra_nand_write_page_hwecc;
> + /* Not functional for unknown reason...
> + chip->ecc.read_page_raw = tegra_nand_read_page;
> + chip->ecc.write_page_raw = tegra_nand_write_page;
Please add the _raw suffix to these helpers.
> + */
> + config = readl(ctrl->regs + CFG);
> + config |= CFG_PIPE_EN | CFG_SKIP_SPARE | CFG_SKIP_SPARE_SIZE_4;
> +
> + if (chip->options & NAND_BUSWIDTH_16)
> + config |= CFG_BUS_WIDTH_16;
> +
> + switch (chip->ecc.algo) {
> + case NAND_ECC_RS:
> + bits_per_step = BITS_PER_STEP_RS * chip->ecc.strength;
> + mtd_set_ooblayout(mtd, &tegra_nand_oob_rs_ops);
> + switch (chip->ecc.strength) {
> + case 4:
> + config |= CFG_ECC_SEL | CFG_TVAL_4;
> + break;
> + case 6:
> + config |= CFG_ECC_SEL | CFG_TVAL_6;
> + break;
> + case 8:
> + config |= CFG_ECC_SEL | CFG_TVAL_8;
> + break;
> + default:
> + dev_err(dev, "ECC strength %d not supported\n",
> + chip->ecc.strength);
> + return -EINVAL;
> + }
> + break;
> + case NAND_ECC_BCH:
> + bits_per_step = BITS_PER_STEP_BCH * chip->ecc.strength;
> + mtd_set_ooblayout(mtd, &tegra_nand_oob_bch_ops);
> + switch (chip->ecc.strength) {
> + case 4:
> + bch_config = BCH_TVAL_4;
> + break;
> + case 8:
> + bch_config = BCH_TVAL_8;
> + break;
> + case 14:
> + bch_config = BCH_TVAL_14;
> + break;
> + case 16:
> + bch_config = BCH_TVAL_16;
> + break;
> + default:
> + dev_err(dev, "ECC strength %d not supported\n",
> + chip->ecc.strength);
> + return -EINVAL;
> + }
> + break;
> + default:
> + dev_err(dev, "ECC algorithm not supported\n");
> + return -EINVAL;
> + }
> +
> + chip->ecc.bytes = DIV_ROUND_UP(bits_per_step, 8);
> +
> + switch (mtd->writesize) {
> + case 256:
> + config |= CFG_PS_256;
> + break;
> + case 512:
> + config |= CFG_PS_512;
> + break;
> + case 1024:
> + config |= CFG_PS_1024;
> + break;
> + case 2048:
> + config |= CFG_PS_2048;
> + break;
> + case 4096:
> + config |= CFG_PS_4096;
> + break;
> + default:
> + dev_err(dev, "unhandled writesize %d\n", mtd->writesize);
> + return -ENODEV;
> + }
> +
> + writel(config, ctrl->regs + CFG);
> + writel(bch_config, ctrl->regs + BCH_CONFIG);
> +
> + err = nand_scan_tail(mtd);
> + if (err)
> + return err;
> +
> + config |= CFG_TAG_BYTE_SIZE(mtd_ooblayout_count_freebytes(mtd) - 1);
> + writel(config, ctrl->regs + CFG);
> +
> + err = mtd_device_register(mtd, NULL, 0);
> + if (err)
Missing nand_cleanup() in the error path.
> + return err;
> +
> + return 0;
> +}
> +
[...]
On 28.05.2018 00:54, Stefan Agner wrote:
> Add support for the NAND flash controller found on NVIDIA
> Tegra 2 SoCs. This implementation does not make use of the
> command queue feature. Regular operations/data transfers are
> done in PIO mode. Page read/writes with hardware ECC make
> use of the DMA for data transfer.
>
> Signed-off-by: Lucas Stach <[email protected]>
> Signed-off-by: Stefan Agner <[email protected]>
> ---
> MAINTAINERS | 7 +
> drivers/mtd/nand/raw/Kconfig | 6 +
> drivers/mtd/nand/raw/Makefile | 1 +
> drivers/mtd/nand/raw/tegra_nand.c | 999 ++++++++++++++++++++++++++++++
> 4 files changed, 1013 insertions(+)
> create mode 100644 drivers/mtd/nand/raw/tegra_nand.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 58b9861ccf99..8cbbb7111742 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -13844,6 +13844,13 @@ M: Laxman Dewangan <[email protected]>
> S: Supported
> F: drivers/input/keyboard/tegra-kbc.c
>
> +TEGRA NAND DRIVER
> +M: Stefan Agner <[email protected]>
> +M: Lucas Stach <[email protected]>
> +S: Maintained
> +F: Documentation/devicetree/bindings/mtd/nvidia,tegra20-nand.txt
> +F: drivers/mtd/nand/raw/tegra_nand.c
> +
> TEGRA PWM DRIVER
> M: Thierry Reding <[email protected]>
> S: Supported
> diff --git a/drivers/mtd/nand/raw/Kconfig b/drivers/mtd/nand/raw/Kconfig
> index 19a2b283fbbe..012c63c6ab47 100644
> --- a/drivers/mtd/nand/raw/Kconfig
> +++ b/drivers/mtd/nand/raw/Kconfig
> @@ -534,4 +534,10 @@ config MTD_NAND_MTK
> Enables support for NAND controller on MTK SoCs.
> This controller is found on mt27xx, mt81xx, mt65xx SoCs.
>
> +config MTD_NAND_TEGRA
> + tristate "Support for NAND on NVIDIA Tegra"
> + depends on ARCH_TEGRA || COMPILE_TEST
> + help
> + Enables support for NAND flash on NVIDIA Tegra SoC based boards.
> +
> endif # MTD_NAND
> diff --git a/drivers/mtd/nand/raw/Makefile b/drivers/mtd/nand/raw/Makefile
> index 165b7ef9e9a1..d5a5f9832b88 100644
> --- a/drivers/mtd/nand/raw/Makefile
> +++ b/drivers/mtd/nand/raw/Makefile
> @@ -56,6 +56,7 @@ obj-$(CONFIG_MTD_NAND_HISI504) += hisi504_nand.o
> obj-$(CONFIG_MTD_NAND_BRCMNAND) += brcmnand/
> obj-$(CONFIG_MTD_NAND_QCOM) += qcom_nandc.o
> obj-$(CONFIG_MTD_NAND_MTK) += mtk_ecc.o mtk_nand.o
> +obj-$(CONFIG_MTD_NAND_TEGRA) += tegra_nand.o
>
> nand-objs := nand_base.o nand_bbt.o nand_timings.o nand_ids.o
> nand-objs += nand_amd.o
> diff --git a/drivers/mtd/nand/raw/tegra_nand.c b/drivers/mtd/nand/raw/tegra_nand.c
> new file mode 100644
> index 000000000000..1a0833d97472
> --- /dev/null
> +++ b/drivers/mtd/nand/raw/tegra_nand.c
> @@ -0,0 +1,999 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2018 Stefan Agner <[email protected]>
> + * Copyright (C) 2014-2015 Lucas Stach <[email protected]>
> + * Copyright (C) 2012 Avionic Design GmbH
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/completion.h>
> +#include <linux/delay.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/err.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/mtd/partitions.h>
> +#include <linux/mtd/rawnand.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/reset.h>
> +
> +#define CMD 0x00
> +#define CMD_GO (1 << 31)
> +#define CMD_CLE (1 << 30)
> +#define CMD_ALE (1 << 29)
> +#define CMD_PIO (1 << 28)
> +#define CMD_TX (1 << 27)
> +#define CMD_RX (1 << 26)
> +#define CMD_SEC_CMD (1 << 25)
> +#define CMD_AFT_DAT (1 << 24)
> +#define CMD_TRANS_SIZE(x) (((x - 1) & 0xf) << 20)
> +#define CMD_A_VALID (1 << 19)
> +#define CMD_B_VALID (1 << 18)
> +#define CMD_RD_STATUS_CHK (1 << 17)
> +#define CMD_RBSY_CHK (1 << 16)
> +#define CMD_CE(x) (1 << (8 + ((x) & 0x7)))
> +#define CMD_CLE_SIZE(x) (((x - 1) & 0x3) << 4)
> +#define CMD_ALE_SIZE(x) (((x - 1) & 0xf) << 0)
> +
> +#define STATUS 0x04
> +
> +#define ISR 0x08
> +#define ISR_CORRFAIL_ERR (1 << 24)
> +#define ISR_UND (1 << 7)
> +#define ISR_OVR (1 << 6)
> +#define ISR_CMD_DONE (1 << 5)
> +#define ISR_ECC_ERR (1 << 4)
> +
> +#define IER 0x0c
> +#define IER_ERR_TRIG_VAL(x) (((x) & 0xf) << 16)
> +#define IER_UND (1 << 7)
> +#define IER_OVR (1 << 6)
> +#define IER_CMD_DONE (1 << 5)
> +#define IER_ECC_ERR (1 << 4)
> +#define IER_GIE (1 << 0)
> +
> +#define CFG 0x10
> +#define CFG_HW_ECC (1 << 31)
> +#define CFG_ECC_SEL (1 << 30)
> +#define CFG_ERR_COR (1 << 29)
> +#define CFG_PIPE_EN (1 << 28)
> +#define CFG_TVAL_4 (0 << 24)
> +#define CFG_TVAL_6 (1 << 24)
> +#define CFG_TVAL_8 (2 << 24)
> +#define CFG_SKIP_SPARE (1 << 23)
> +#define CFG_BUS_WIDTH_8 (0 << 21)
> +#define CFG_BUS_WIDTH_16 (1 << 21)
> +#define CFG_COM_BSY (1 << 20)
> +#define CFG_PS_256 (0 << 16)
> +#define CFG_PS_512 (1 << 16)
> +#define CFG_PS_1024 (2 << 16)
> +#define CFG_PS_2048 (3 << 16)
> +#define CFG_PS_4096 (4 << 16)
> +#define CFG_SKIP_SPARE_SIZE_4 (0 << 14)
> +#define CFG_SKIP_SPARE_SIZE_8 (1 << 14)
> +#define CFG_SKIP_SPARE_SIZE_12 (2 << 14)
> +#define CFG_SKIP_SPARE_SIZE_16 (3 << 14)
> +#define CFG_TAG_BYTE_SIZE(x) ((x) & 0xff)
> +
> +#define TIMING_1 0x14
> +#define TIMING_TRP_RESP(x) (((x) & 0xf) << 28)
> +#define TIMING_TWB(x) (((x) & 0xf) << 24)
> +#define TIMING_TCR_TAR_TRR(x) (((x) & 0xf) << 20)
> +#define TIMING_TWHR(x) (((x) & 0xf) << 16)
> +#define TIMING_TCS(x) (((x) & 0x3) << 14)
> +#define TIMING_TWH(x) (((x) & 0x3) << 12)
> +#define TIMING_TWP(x) (((x) & 0xf) << 8)
> +#define TIMING_TRH(x) (((x) & 0xf) << 4)
> +#define TIMING_TRP(x) (((x) & 0xf) << 0)
> +
> +#define RESP 0x18
> +
> +#define TIMING_2 0x1c
> +#define TIMING_TADL(x) ((x) & 0xf)
> +
> +#define CMD_1 0x20
> +#define CMD_2 0x24
> +#define ADDR_1 0x28
> +#define ADDR_2 0x2c
> +
> +#define DMA_CTRL 0x30
> +#define DMA_CTRL_GO (1 << 31)
> +#define DMA_CTRL_IN (0 << 30)
> +#define DMA_CTRL_OUT (1 << 30)
> +#define DMA_CTRL_PERF_EN (1 << 29)
> +#define DMA_CTRL_IE_DONE (1 << 28)
> +#define DMA_CTRL_REUSE (1 << 27)
> +#define DMA_CTRL_BURST_1 (2 << 24)
> +#define DMA_CTRL_BURST_4 (3 << 24)
> +#define DMA_CTRL_BURST_8 (4 << 24)
> +#define DMA_CTRL_BURST_16 (5 << 24)
> +#define DMA_CTRL_IS_DONE (1 << 20)
> +#define DMA_CTRL_EN_A (1 << 2)
> +#define DMA_CTRL_EN_B (1 << 1)
> +
> +#define DMA_CFG_A 0x34
> +#define DMA_CFG_B 0x38
> +
> +#define FIFO_CTRL 0x3c
> +#define FIFO_CTRL_CLR_ALL (1 << 3)
> +
> +#define DATA_PTR 0x40
> +#define TAG_PTR 0x44
> +#define ECC_PTR 0x48
> +
> +#define DEC_STATUS 0x4c
> +#define DEC_STATUS_A_ECC_FAIL (1 << 1)
> +#define DEC_STATUS_ERR_COUNT_MASK 0x00ff0000
> +#define DEC_STATUS_ERR_COUNT_SHIFT 16
> +
> +#define HWSTATUS_CMD 0x50
> +#define HWSTATUS_MASK 0x54
> +#define HWSTATUS_RDSTATUS_MASK(x) (((x) & 0xff) << 24)
> +#define HWSTATUS_RDSTATUS_VALUE(x) (((x) & 0xff) << 16)
> +#define HWSTATUS_RBSY_MASK(x) (((x) & 0xff) << 8)
> +#define HWSTATUS_RBSY_VALUE(x) (((x) & 0xff) << 0)
> +
> +#define BCH_CONFIG 0xcc
> +#define BCH_ENABLE (1 << 0)
> +#define BCH_TVAL_4 (0 << 4)
> +#define BCH_TVAL_8 (1 << 4)
> +#define BCH_TVAL_14 (2 << 4)
> +#define BCH_TVAL_16 (3 << 4)
> +
> +#define DEC_STAT_RESULT 0xd0
> +#define DEC_STAT_BUF 0xd4
> +#define DEC_STAT_BUF_FAIL_SEC_FLAG_MASK 0xff000000
> +#define DEC_STAT_BUF_FAIL_SEC_FLAG_SHIFT 24
> +#define DEC_STAT_BUF_CORR_SEC_FLAG_MASK 0x00ff0000
> +#define DEC_STAT_BUF_CORR_SEC_FLAG_SHIFT 16
> +#define DEC_STAT_BUF_MAX_CORR_CNT_MASK 0x00001f00
> +#define DEC_STAT_BUF_MAX_CORR_CNT_SHIFT 8
> +
> +#define SKIP_SPARE_BYTES 4
> +#define BITS_PER_STEP_RS 18
> +#define BITS_PER_STEP_BCH 13
> +
> +struct tegra_nand_controller {
> + struct nand_hw_control controller;
> + void __iomem *regs;
> + struct clk *clk;
> + struct device *dev;
> + struct completion command_complete;
> + struct completion dma_complete;
> + bool last_read_error;
> + int cur_chip;
> + struct nand_chip *chip;
> +};
> +
> +struct tegra_nand_chip {
> + struct nand_chip chip;
> + struct gpio_desc *wp_gpio;
> +};
> +
> +static inline struct tegra_nand_controller *to_tegra_ctrl(
> + struct nand_hw_control *hw_ctrl)
> +{
> + return container_of(hw_ctrl, struct tegra_nand_controller, controller);
> +}
> +
> +static int tegra_nand_ooblayout_rs_ecc(struct mtd_info *mtd, int section,
> + struct mtd_oob_region *oobregion)
> +{
> + struct nand_chip *chip = mtd_to_nand(mtd);
> + int bytes_per_step = (BITS_PER_STEP_RS * chip->ecc.strength) / 8;
> +
> + if (section > 0)
> + return -ERANGE;
> +
> + oobregion->offset = SKIP_SPARE_BYTES;
> + oobregion->length = round_up(bytes_per_step * chip->ecc.steps, 4);
> +
> + return 0;
> +}
> +
> +static int tegra_nand_ooblayout_rs_free(struct mtd_info *mtd, int section,
> + struct mtd_oob_region *oobregion)
> +{
> + struct nand_chip *chip = mtd_to_nand(mtd);
> + int bytes_per_step = DIV_ROUND_UP(BITS_PER_STEP_RS * chip->ecc.strength, 8);
> +
> + if (section > 0)
> + return -ERANGE;
> +
> + oobregion->offset = SKIP_SPARE_BYTES +
> + round_up(bytes_per_step * chip->ecc.steps, 4);
> + oobregion->length = mtd->oobsize - oobregion->offset;
> +
> + return 0;
> +}
> +
> +static const struct mtd_ooblayout_ops tegra_nand_oob_rs_ops = {
> + .ecc = tegra_nand_ooblayout_rs_ecc,
> + .free = tegra_nand_ooblayout_rs_free,
> +};
> +
> +static int tegra_nand_ooblayout_bch_ecc(struct mtd_info *mtd, int section,
> + struct mtd_oob_region *oobregion)
> +{
> + struct nand_chip *chip = mtd_to_nand(mtd);
> + int bytes_per_step = DIV_ROUND_UP(BITS_PER_STEP_BCH * chip->ecc.strength, 8);
> +
> + if (section > 0)
> + return -ERANGE;
> +
> + oobregion->offset = SKIP_SPARE_BYTES;
> + oobregion->length = round_up(bytes_per_step * chip->ecc.steps, 4);
> +
> + return 0;
> +}
> +
> +static int tegra_nand_ooblayout_bch_free(struct mtd_info *mtd, int section,
> + struct mtd_oob_region *oobregion)
> +{
> + struct nand_chip *chip = mtd_to_nand(mtd);
> + int bytes_per_step = (BITS_PER_STEP_BCH * chip->ecc.strength) / 8;
> +
> + if (section > 0)
> + return -ERANGE;
> +
> + oobregion->offset = SKIP_SPARE_BYTES +
> + round_up(bytes_per_step * chip->ecc.steps, 4);
> + oobregion->length = mtd->oobsize - oobregion->offset;
> +
> + return 0;
> +}
> +
> +/*
> + * Layout with tag bytes is
> + *
> + * --------------------------------------------------------------------------
> + * | main area | skip bytes | tag bytes | parity | .. |
> + * --------------------------------------------------------------------------
> + *
> + * If not tag bytes are written, parity moves right after skip bytes!
> + */
> +static const struct mtd_ooblayout_ops tegra_nand_oob_bch_ops = {
> + .ecc = tegra_nand_ooblayout_bch_ecc,
> + .free = tegra_nand_ooblayout_bch_free,
> +};
> +
> +static irqreturn_t tegra_nand_irq(int irq, void *data)
> +{
> + struct tegra_nand_controller *ctrl = data;
> + u32 isr, dma;
> +
> + isr = readl_relaxed(ctrl->regs + ISR);
> + dma = readl_relaxed(ctrl->regs + DMA_CTRL);
> + dev_dbg(ctrl->dev, "isr %08x\n", isr);
> +
> + if (!isr && !(dma & DMA_CTRL_IS_DONE))
> + return IRQ_NONE;
> +
> + if (isr & ISR_CORRFAIL_ERR)
> + ctrl->last_read_error = true;
> +
> + if (isr & ISR_CMD_DONE)
> + complete(&ctrl->command_complete);
> +
> + if (isr & ISR_UND)
> + dev_dbg(ctrl->dev, "FIFO underrun\n");
> +
> + if (isr & ISR_OVR)
> + dev_dbg(ctrl->dev, "FIFO overrun\n");
> +
> + /* handle DMA interrupts */
> + if (dma & DMA_CTRL_IS_DONE) {
> + writel(dma, ctrl->regs + DMA_CTRL);
> + complete(&ctrl->dma_complete);
> + }
> +
> + /* clear interrupts */
> + writel(isr, ctrl->regs + ISR);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static int tegra_nand_cmd(struct nand_chip *chip,
> + const struct nand_subop *subop)
> +{
> + const struct nand_op_instr *instr;
> + const struct nand_op_instr *instr_data_in = NULL;
> + struct tegra_nand_controller *ctrl = to_tegra_ctrl(chip->controller);
> + unsigned int op_id = -1, trfr_in_sz = 0, trfr_out_sz = 0, offset = 0;
> + bool first_cmd = true;
> + u32 cmd = 0;
> + u32 value;
> +
> + for (op_id = 0; op_id < subop->ninstrs; op_id++) {
> + unsigned int naddrs, i;
> + const u8 *addrs;
> + u32 addr1 = 0, addr2 = 0;
> +
> + instr = &subop->instrs[op_id];
> +
> + switch (instr->type) {
> + case NAND_OP_CMD_INSTR:
> + if (first_cmd) {
> + cmd |= CMD_CLE;
> + writel(instr->ctx.cmd.opcode, ctrl->regs + CMD_1);
> + } else {
> + cmd |= CMD_SEC_CMD;
> + writel(instr->ctx.cmd.opcode, ctrl->regs + CMD_2);
> + }
> + first_cmd = false;
> + break;
> + case NAND_OP_ADDR_INSTR:
> + offset = nand_subop_get_addr_start_off(subop, op_id);
> + naddrs = nand_subop_get_num_addr_cyc(subop, op_id);
> + addrs = &instr->ctx.addr.addrs[offset];
> +
> + cmd |= CMD_ALE | CMD_ALE_SIZE(naddrs);
> + for (i = 0; i < min_t(unsigned int, 4, naddrs); i++)
> + addr1 |= *addrs++ << (8 * i);
> + naddrs -= i;
> + for (i = 0; i < min_t(unsigned int, 4, naddrs); i++)
> + addr2 |= *addrs++ << (8 * i);
> + writel(addr1, ctrl->regs + ADDR_1);
> + writel(addr2, ctrl->regs + ADDR_2);
> + break;
> +
> + case NAND_OP_DATA_IN_INSTR:
> + trfr_in_sz = nand_subop_get_data_len(subop, op_id);
> + offset = nand_subop_get_data_start_off(subop, op_id);
> +
> + cmd |= CMD_TRANS_SIZE(trfr_in_sz) | CMD_PIO | CMD_RX | CMD_A_VALID;
> +
> + instr_data_in = instr;
> + break;
> +
> + case NAND_OP_DATA_OUT_INSTR:
> + trfr_out_sz = nand_subop_get_data_len(subop, op_id);
> + offset = nand_subop_get_data_start_off(subop, op_id);
> + trfr_out_sz = min_t(size_t, trfr_out_sz, 4);
> +
> + cmd |= CMD_TRANS_SIZE(trfr_out_sz) | CMD_PIO | CMD_TX | CMD_A_VALID;
> +
> + memcpy(&value, instr->ctx.data.buf.out + offset, trfr_out_sz);
> + writel(value, ctrl->regs + RESP);
> +
> + break;
> + case NAND_OP_WAITRDY_INSTR:
> + cmd |= CMD_RBSY_CHK;
> + break;
> +
> + }
> + }
> +
> +
> + cmd |= CMD_GO | CMD_CE(ctrl->cur_chip);
> + writel(cmd, ctrl->regs + CMD);
> + wait_for_completion(&ctrl->command_complete);
Could this and other completions stuck forever? What about
wait_for_completion_timeout() + HW reset / re-init on timeout?
> +
> + if (instr_data_in) {
> + u32 value;
> + size_t n = min_t(size_t, trfr_in_sz, 4);
> +
> + value = readl(ctrl->regs + RESP);
> + memcpy(instr_data_in->ctx.data.buf.in + offset, &value, n);
> + }
> +
> + return 0;
> +}
> +
> +static const struct nand_op_parser tegra_nand_op_parser = NAND_OP_PARSER(
> + NAND_OP_PARSER_PATTERN(tegra_nand_cmd,
> + NAND_OP_PARSER_PAT_CMD_ELEM(true),
> + NAND_OP_PARSER_PAT_ADDR_ELEM(true, 8),
> + NAND_OP_PARSER_PAT_CMD_ELEM(true),
> + NAND_OP_PARSER_PAT_WAITRDY_ELEM(true)),
> + NAND_OP_PARSER_PATTERN(tegra_nand_cmd,
> + NAND_OP_PARSER_PAT_DATA_OUT_ELEM(false, 4)),
> + NAND_OP_PARSER_PATTERN(tegra_nand_cmd,
> + NAND_OP_PARSER_PAT_CMD_ELEM(true),
> + NAND_OP_PARSER_PAT_ADDR_ELEM(true, 8),
> + NAND_OP_PARSER_PAT_CMD_ELEM(true),
> + NAND_OP_PARSER_PAT_WAITRDY_ELEM(true),
> + NAND_OP_PARSER_PAT_DATA_IN_ELEM(true, 4)),
> + );
> +
> +static int tegra_nand_exec_op(struct nand_chip *chip,
> + const struct nand_operation *op,
> + bool check_only)
> +{
> + return nand_op_parser_exec_op(chip, &tegra_nand_op_parser, op,
> + check_only);
> +}
> +static void tegra_nand_select_chip(struct mtd_info *mtd, int chip_nr)
> +{
> + struct nand_chip *chip = mtd_to_nand(mtd);
> + struct tegra_nand_controller *ctrl = to_tegra_ctrl(chip->controller);
> +
> + ctrl->cur_chip = chip_nr;
> +}
> +
> +static u32 tegra_nand_fill_address(struct tegra_nand_controller *ctrl,
> + struct nand_chip *chip, int page)
> +{
> + /* Lower 16-bits are column, always 0 */
> + writel(page << 16, ctrl->regs + ADDR_1);
> +
> + if (chip->options & NAND_ROW_ADDR_3) {
> + writel(page >> 16, ctrl->regs + ADDR_2);
> + return 5;
> + }
> +
> + return 4;
> +}
> +
> +static void tegra_nand_hw_ecc(struct tegra_nand_controller *ctrl,
> + struct nand_chip *chip, bool enable)
> +{
> + u32 value;
> +
> + switch (chip->ecc.algo) {
> + case NAND_ECC_RS:
> + value = readl(ctrl->regs + CFG);
> + if (enable)
> + value |= CFG_HW_ECC | CFG_ERR_COR;
> + else
> + value &= ~(CFG_HW_ECC | CFG_ERR_COR);
> + writel(value, ctrl->regs + CFG);
> + break;
> + case NAND_ECC_BCH:
> + value = readl(ctrl->regs + BCH_CONFIG);
> + if (enable)
> + value |= BCH_ENABLE;
> + else
> + value &= ~BCH_ENABLE;
> + writel(value, ctrl->regs + BCH_CONFIG);
> + break;
> + default:
> + dev_err(ctrl->dev, "Unsupported hardware ECC algorithm\n");
> + break;
> + }
> +}
> +
> +static int tegra_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
> + uint8_t *buf, int oob_required, int page)
> +{
> + struct tegra_nand_controller *ctrl = to_tegra_ctrl(chip->controller);
> + dma_addr_t dma_addr;
> + u32 value, addrs;
> + int ret, dma_len;
> +
> + writel(NAND_CMD_READ0, ctrl->regs + CMD_1);
> + writel(NAND_CMD_READSTART, ctrl->regs + CMD_2);
> +
> + addrs = tegra_nand_fill_address(ctrl, chip, page);
> +
> + dma_len = mtd->writesize + (oob_required ? mtd->oobsize : 0);
> + dma_addr = dma_map_single(ctrl->dev, buf, dma_len, DMA_FROM_DEVICE);
> + ret = dma_mapping_error(ctrl->dev, dma_addr);
> + if (ret) {
> + dev_err(ctrl->dev, "dma mapping error\n");
> + return -EINVAL;
> + }
> +
> + writel(mtd->writesize - 1, ctrl->regs + DMA_CFG_A);
> + writel(dma_addr, ctrl->regs + DATA_PTR);
> +
> + if (oob_required) {
> + struct mtd_oob_region oobregion;
> + dma_addr_t dma_addr_oob = dma_addr + mtd->writesize;
> +
> + mtd_ooblayout_free(mtd, 0, &oobregion);
> +
> + writel(oobregion.length - 1, ctrl->regs + DMA_CFG_B);
> + writel(dma_addr_oob + oobregion.offset, ctrl->regs + TAG_PTR);
> + } else {
> + writel(0, ctrl->regs + DMA_CFG_B);
> + writel(0, ctrl->regs + TAG_PTR);
> + }
> +
> + value = DMA_CTRL_GO | DMA_CTRL_IN | DMA_CTRL_PERF_EN |
> + DMA_CTRL_REUSE | DMA_CTRL_IE_DONE | DMA_CTRL_IS_DONE |
> + DMA_CTRL_BURST_16 | DMA_CTRL_EN_A;
> + if (oob_required)
> + value |= DMA_CTRL_EN_B;
> + writel(value, ctrl->regs + DMA_CTRL);
> +
> + value = CMD_CLE | CMD_ALE | CMD_ALE_SIZE(addrs) | CMD_SEC_CMD |
> + CMD_RBSY_CHK | CMD_GO | CMD_RX | CMD_TRANS_SIZE(9) |
> + CMD_A_VALID | CMD_CE(ctrl->cur_chip);
> + if (oob_required)
> + value |= CMD_B_VALID;
> + writel(value, ctrl->regs + CMD);
> +
> + wait_for_completion(&ctrl->command_complete);
> + wait_for_completion(&ctrl->dma_complete);
> +
> + dma_unmap_single(ctrl->dev, dma_addr, dma_len, DMA_FROM_DEVICE);
> +
> + return 0;
> +}
> +
> +static int tegra_nand_read_page_hwecc(struct mtd_info *mtd,
> + struct nand_chip *chip,
> + uint8_t *buf, int oob_required, int page)
> +{
> + struct tegra_nand_controller *ctrl = to_tegra_ctrl(chip->controller);
> + u32 value;
> + int ret;
> +
> + tegra_nand_hw_ecc(ctrl, chip, true);
> + ret = tegra_nand_read_page(mtd, chip, buf, oob_required, page);
> + tegra_nand_hw_ecc(ctrl, chip, false);
> + if (ret)
> + return ret;
> +
> + /* If no correctable or un-correctable errors occured we can return 0 */
> + if (!ctrl->last_read_error)
> + return 0;
> +
> + /*
> + * Correctable or un-correctable errors did occure. NAND dec status
> + * contains information for all ECC selections
> + */
> + ctrl->last_read_error = false;
> + value = readl(ctrl->regs + DEC_STAT_BUF);
> +
> + if (value & DEC_STAT_BUF_FAIL_SEC_FLAG_MASK) {
> + /*
> + * The ECC isn't smart enough to figure out if a page is
> + * completely erased and flags an error in this case. So we
> + * check the read data here to figure out if it's a legitimate
> + * error or a false positive.
> + */
> + int i, ret;
> + int flips_threshold = chip->ecc.strength / 2;
> + int max_bitflips = 0;
> +
> + for (i = 0; i < chip->ecc.steps; i++) {
> + u8 *data = buf + (chip->ecc.size * i);
> +
> + ret = nand_check_erased_ecc_chunk(data, chip->ecc.size,
> + NULL, 0,
> + NULL, 0,
> + flips_threshold);
> + if (ret < 0)
> + mtd->ecc_stats.failed++;
> + else
> + max_bitflips = max(ret, max_bitflips);
> + }
> +
> + return max_bitflips;
> + } else {
> + int max_corr_cnt, corr_sec_flag;
> +
> + corr_sec_flag = (value & DEC_STAT_BUF_CORR_SEC_FLAG_MASK) >>
> + DEC_STAT_BUF_CORR_SEC_FLAG_SHIFT;
> + max_corr_cnt = (value & DEC_STAT_BUF_MAX_CORR_CNT_MASK) >>
> + DEC_STAT_BUF_MAX_CORR_CNT_SHIFT;
> +
> + /*
> + * The value returned in the register is the maximum of
> + * bitflips encountered in any of the ECC regions. As there is
> + * no way to get the number of bitflips in a specific regions
> + * we are not able to deliver correct stats but instead
> + * overestimate the number of corrected bitflips by assuming
> + * that all regions where errors have been corrected
> + * encountered the maximum number of bitflips.
> + */
> + mtd->ecc_stats.corrected += max_corr_cnt * hweight8(corr_sec_flag);
> +
> + return max_corr_cnt;
> + }
> +
> +}
> +
> +static int tegra_nand_write_page(struct mtd_info *mtd, struct nand_chip *chip,
> + const uint8_t *buf, int oob_required, int page)
> +{
> + struct tegra_nand_controller *ctrl = to_tegra_ctrl(chip->controller);
> + dma_addr_t dma_addr;
> + u32 value, addrs;
> + int ret, dma_len;
> +
> + writel(NAND_CMD_SEQIN, ctrl->regs + CMD_1);
> + writel(NAND_CMD_PAGEPROG, ctrl->regs + CMD_2);
> +
> + addrs = tegra_nand_fill_address(ctrl, chip, page);
> +
> + dma_len = mtd->writesize + (oob_required ? mtd->oobsize : 0);
> + dma_addr = dma_map_single(ctrl->dev, (void *)buf, dma_len, DMA_TO_DEVICE);
> + ret = dma_mapping_error(ctrl->dev, dma_addr);
> + if (ret) {
> + dev_err(ctrl->dev, "dma mapping error\n");
> + return -EINVAL;
> + }
> +
> + writel(mtd->writesize - 1, ctrl->regs + DMA_CFG_A);
> + writel(dma_addr, ctrl->regs + DATA_PTR);
> +
> + if (oob_required) {
> + struct mtd_oob_region oobregion;
> + dma_addr_t dma_addr_oob = dma_addr + mtd->writesize;
> +
> + mtd_ooblayout_free(mtd, 0, &oobregion);
> +
> + writel(oobregion.length - 1, ctrl->regs + DMA_CFG_B);
> + writel(dma_addr_oob + oobregion.offset, ctrl->regs + TAG_PTR);
> + } else {
> + writel(0, ctrl->regs + DMA_CFG_B);
> + writel(0, ctrl->regs + TAG_PTR);
> + }
> +
> + value = DMA_CTRL_GO | DMA_CTRL_OUT | DMA_CTRL_PERF_EN |
> + DMA_CTRL_IE_DONE | DMA_CTRL_IS_DONE |
> + DMA_CTRL_BURST_16 | DMA_CTRL_EN_A;
> + if (oob_required)
> + value |= DMA_CTRL_EN_B;
> + writel(value, ctrl->regs + DMA_CTRL);
> +
> + value = CMD_CLE | CMD_ALE | CMD_ALE_SIZE(addrs) | CMD_SEC_CMD |
> + CMD_AFT_DAT | CMD_RBSY_CHK | CMD_GO | CMD_TX | CMD_A_VALID |
> + CMD_TRANS_SIZE(9) | CMD_CE(ctrl->cur_chip);
> + if (oob_required)
> + value |= CMD_B_VALID;
> + writel(value, ctrl->regs + CMD);
> +
> + wait_for_completion(&ctrl->command_complete);
> + wait_for_completion(&ctrl->dma_complete);
> +
> +
> + dma_unmap_single(ctrl->dev, dma_addr, dma_len, DMA_TO_DEVICE);
> +
> + return 0;
> +}
> +
> +static int tegra_nand_write_page_hwecc(struct mtd_info *mtd,
> + struct nand_chip *chip,
> + const uint8_t *buf, int oob_required,
> + int page)
> +{
> + struct tegra_nand_controller *ctrl = to_tegra_ctrl(chip->controller);
> + int ret;
> +
> + tegra_nand_hw_ecc(ctrl, chip, true);
> + ret = tegra_nand_write_page(mtd, chip, buf, oob_required, page);
> + tegra_nand_hw_ecc(ctrl, chip, false);
> +
> + return ret;
> +}
> +
> +static void tegra_nand_setup_timing(struct tegra_nand_controller *ctrl,
> + const struct nand_sdr_timings *timings)
> +{
> + /*
> + * The period (and all other timings in this function) is in ps,
> + * so need to take care here to avoid integer overflows.
> + */
> + unsigned int rate = clk_get_rate(ctrl->clk) / 1000000;
> + unsigned int period = DIV_ROUND_UP(1000000, rate);
> + u32 val, reg = 0;
> +
> + val = DIV_ROUND_UP(max3(timings->tAR_min, timings->tRR_min,
> + timings->tRC_min), period);
> + if (val > 2)
> + val -= 3;
> + reg |= TIMING_TCR_TAR_TRR(val);
> +
> + val = DIV_ROUND_UP(max(max(timings->tCS_min, timings->tCH_min),
> + max(timings->tALS_min, timings->tALH_min)),
> + period);
> + if (val > 1)
> + val -= 2;
> + reg |= TIMING_TCS(val);
> +
> + val = DIV_ROUND_UP(max(timings->tRP_min, timings->tREA_max) + 6000,
> + period);
> + reg |= TIMING_TRP(val) | TIMING_TRP_RESP(val);
> +
> + reg |= TIMING_TWB(DIV_ROUND_UP(timings->tWB_max, period));
> + reg |= TIMING_TWHR(DIV_ROUND_UP(timings->tWHR_min, period));
> + reg |= TIMING_TWH(DIV_ROUND_UP(timings->tWH_min, period));
> + reg |= TIMING_TWP(DIV_ROUND_UP(timings->tWP_min, period));
> + reg |= TIMING_TRH(DIV_ROUND_UP(timings->tRHW_min, period));
> +
> + writel(reg, ctrl->regs + TIMING_1);
> +
> + val = DIV_ROUND_UP(timings->tADL_min, period);
> + if (val > 2)
> + val -= 3;
> + reg = TIMING_TADL(val);
> +
> + writel(reg, ctrl->regs + TIMING_2);
> +}
> +
> +static int tegra_nand_setup_data_interface(struct mtd_info *mtd, int csline,
> + const struct nand_data_interface *conf)
> +{
> + struct nand_chip *chip = mtd_to_nand(mtd);
> + struct tegra_nand_controller *ctrl = to_tegra_ctrl(chip->controller);
> + const struct nand_sdr_timings *timings;
> +
> + timings = nand_get_sdr_timings(conf);
> + if (IS_ERR(timings))
> + return PTR_ERR(timings);
> +
> + if (csline == NAND_DATA_IFACE_CHECK_ONLY)
> + return 0;
> +
> + tegra_nand_setup_timing(ctrl, timings);
> +
> + return 0;
> +}
> +
> +static int tegra_nand_chips_init(struct device *dev,
> + struct tegra_nand_controller *ctrl)
> +{
> + struct device_node *np = dev->of_node;
> + struct device_node *np_nand;
> + int nchips = of_get_child_count(np);
> + struct tegra_nand_chip *nand;
> + struct mtd_info *mtd;
> + struct nand_chip *chip;
> + unsigned long config, bch_config = 0;
> + int bits_per_step;
> + int err;
> +
> + if (nchips != 1) {
> + dev_err(dev, "currently only one NAND chip supported\n");
> + return -EINVAL;
> + }
> +
> + np_nand = of_get_next_child(np, NULL);
> +
> + nand = devm_kzalloc(dev, sizeof(*nand), GFP_KERNEL);
> + if (!nand) {
> + dev_err(dev, "could not allocate chip structure\n");
> + return -ENOMEM;
> + }
> +
> + nand->wp_gpio = devm_gpiod_get_optional(dev, "wp", GPIOD_OUT_LOW);
> +
> + if (IS_ERR(nand->wp_gpio)) {
> + err = PTR_ERR(nand->wp_gpio);
> + dev_err(dev, "failed to request WP GPIO: %d\n", err);
> + return err;
> + }
> +
> + chip = &nand->chip;
> + chip->controller = &ctrl->controller;
> + ctrl->chip = chip;
> +
> + mtd = nand_to_mtd(chip);
> +
> + mtd->dev.parent = dev;
> + mtd->name = "tegra_nand";
> + mtd->owner = THIS_MODULE;
> +
> + nand_set_flash_node(chip, np_nand);
> +
> + chip->options = NAND_NO_SUBPAGE_WRITE | NAND_USE_BOUNCE_BUFFER;
> + chip->exec_op = tegra_nand_exec_op;
> + chip->select_chip = tegra_nand_select_chip;
> + chip->setup_data_interface = tegra_nand_setup_data_interface;
> +
> + err = nand_scan_ident(mtd, 1, NULL);
> + if (err)
> + return err;
> +
> + if (chip->bbt_options & NAND_BBT_USE_FLASH)
> + chip->bbt_options |= NAND_BBT_NO_OOB;
> +
> + chip->ecc.mode = NAND_ECC_HW;
> + if (!chip->ecc.size)
> + chip->ecc.size = 512;
> + if (chip->ecc.size != 512)
> + return -EINVAL;
> +
> + chip->ecc.read_page = tegra_nand_read_page_hwecc;
> + chip->ecc.write_page = tegra_nand_write_page_hwecc;
> + /* Not functional for unknown reason...
> + chip->ecc.read_page_raw = tegra_nand_read_page;
> + chip->ecc.write_page_raw = tegra_nand_write_page;
> + */
> + config = readl(ctrl->regs + CFG);
> + config |= CFG_PIPE_EN | CFG_SKIP_SPARE | CFG_SKIP_SPARE_SIZE_4;
> +
> + if (chip->options & NAND_BUSWIDTH_16)
> + config |= CFG_BUS_WIDTH_16;
> +
> + switch (chip->ecc.algo) {
> + case NAND_ECC_RS:
> + bits_per_step = BITS_PER_STEP_RS * chip->ecc.strength;
> + mtd_set_ooblayout(mtd, &tegra_nand_oob_rs_ops);
> + switch (chip->ecc.strength) {
> + case 4:
> + config |= CFG_ECC_SEL | CFG_TVAL_4;
> + break;
> + case 6:
> + config |= CFG_ECC_SEL | CFG_TVAL_6;
> + break;
> + case 8:
> + config |= CFG_ECC_SEL | CFG_TVAL_8;
> + break;
> + default:
> + dev_err(dev, "ECC strength %d not supported\n",
> + chip->ecc.strength);
> + return -EINVAL;
> + }
> + break;
> + case NAND_ECC_BCH:
> + bits_per_step = BITS_PER_STEP_BCH * chip->ecc.strength;
> + mtd_set_ooblayout(mtd, &tegra_nand_oob_bch_ops);
> + switch (chip->ecc.strength) {
> + case 4:
> + bch_config = BCH_TVAL_4;
> + break;
> + case 8:
> + bch_config = BCH_TVAL_8;
> + break;
> + case 14:
> + bch_config = BCH_TVAL_14;
> + break;
> + case 16:
> + bch_config = BCH_TVAL_16;
> + break;
> + default:
> + dev_err(dev, "ECC strength %d not supported\n",
> + chip->ecc.strength);
> + return -EINVAL;
> + }
> + break;
> + default:
> + dev_err(dev, "ECC algorithm not supported\n");
> + return -EINVAL;
> + }
> +
> + chip->ecc.bytes = DIV_ROUND_UP(bits_per_step, 8);
> +
> + switch (mtd->writesize) {
> + case 256:
> + config |= CFG_PS_256;
> + break;
> + case 512:
> + config |= CFG_PS_512;
> + break;
> + case 1024:
> + config |= CFG_PS_1024;
> + break;
> + case 2048:
> + config |= CFG_PS_2048;
> + break;
> + case 4096:
> + config |= CFG_PS_4096;
> + break;
> + default:
> + dev_err(dev, "unhandled writesize %d\n", mtd->writesize);
> + return -ENODEV;
> + }
> +
> + writel(config, ctrl->regs + CFG);
> + writel(bch_config, ctrl->regs + BCH_CONFIG);
> +
> + err = nand_scan_tail(mtd);
> + if (err)
> + return err;
> +
> + config |= CFG_TAG_BYTE_SIZE(mtd_ooblayout_count_freebytes(mtd) - 1);
> + writel(config, ctrl->regs + CFG);
> +
> + err = mtd_device_register(mtd, NULL, 0);
> + if (err)
> + return err;
> +
> + return 0;
> +}
> +
> +static int tegra_nand_probe(struct platform_device *pdev)
> +{
> + struct reset_control *rst;
> + struct tegra_nand_controller *ctrl;
> + struct resource *res;
> + unsigned long value;
> + int irq, err = 0;
> +
> + ctrl = devm_kzalloc(&pdev->dev, sizeof(*ctrl), GFP_KERNEL);
> + if (!ctrl)
> + return -ENOMEM;
> +
> + ctrl->dev = &pdev->dev;
> + nand_hw_control_init(&ctrl->controller);
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + ctrl->regs = devm_ioremap_resource(&pdev->dev, res);
> + if (IS_ERR(ctrl->regs))
> + return PTR_ERR(ctrl->regs);
> +
> + rst = devm_reset_control_get(&pdev->dev, "nand");
> + if (IS_ERR(rst))
> + return PTR_ERR(rst);
> +
> + ctrl->clk = devm_clk_get(&pdev->dev, "nand");
> + if (IS_ERR(ctrl->clk))
> + return PTR_ERR(ctrl->clk);
> +
> + err = clk_prepare_enable(ctrl->clk);
> + if (err)
> + return err;
> +
> + reset_control_reset(rst);
Technically reset_control_reset() could fail, so this should be:
err = reset_control_reset(rst);
if (err)
goto err_disable_clk;
> +
> + value = HWSTATUS_RDSTATUS_MASK(1) | HWSTATUS_RDSTATUS_VALUE(0) |
> + HWSTATUS_RBSY_MASK(NAND_STATUS_READY) |
> + HWSTATUS_RBSY_VALUE(NAND_STATUS_READY);
> + writel(NAND_CMD_STATUS, ctrl->regs + HWSTATUS_CMD);
> + writel(value, ctrl->regs + HWSTATUS_MASK);
> +
> + init_completion(&ctrl->command_complete);
> + init_completion(&ctrl->dma_complete);
> +
> + /* clear interrupts */
> + value = readl(ctrl->regs + ISR);
> + writel(value, ctrl->regs + ISR);
> +
> + irq = platform_get_irq(pdev, 0);
> + err = devm_request_irq(&pdev->dev, irq, tegra_nand_irq, 0,
> + dev_name(&pdev->dev), ctrl);
> + if (err)
> + goto err_disable_clk;
> +
> + writel(DMA_CTRL_IS_DONE, ctrl->regs + DMA_CTRL);
> +
> + /* enable interrupts */
> + value = IER_UND | IER_OVR | IER_CMD_DONE | IER_ECC_ERR | IER_GIE;
> + writel(value, ctrl->regs + IER);
> +
> + /* reset config */
> + writel(0, ctrl->regs + CFG);
> +
> + err = tegra_nand_chips_init(ctrl->dev, ctrl);
> + if (err)
> + goto err_disable_clk;
> +
> + platform_set_drvdata(pdev, ctrl);
> +
> + return 0;
> +
> +err_disable_clk:
> + clk_disable_unprepare(ctrl->clk);
> + return err;
> +}
> +
> +static int tegra_nand_remove(struct platform_device *pdev)
> +{
> + struct tegra_nand_controller *ctrl = platform_get_drvdata(pdev);
> +
> + nand_release(nand_to_mtd(ctrl->chip));
> +
> + clk_disable_unprepare(ctrl->clk);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id tegra_nand_of_match[] = {
> + { .compatible = "nvidia,tegra20-nand" },
> + { /* sentinel */ }
> +};
> +
> +static struct platform_driver tegra_nand_driver = {
> + .driver = {
> + .name = "tegra-nand",
> + .of_match_table = tegra_nand_of_match,
> + },
> + .probe = tegra_nand_probe,
> + .remove = tegra_nand_remove,
> +};
> +module_platform_driver(tegra_nand_driver);
> +
> +MODULE_DESCRIPTION("NVIDIA Tegra NAND driver");
> +MODULE_AUTHOR("Thierry Reding <[email protected]>");
> +MODULE_AUTHOR("Lucas Stach <[email protected]>");
> +MODULE_AUTHOR("Stefan Agner <[email protected]>");
> +MODULE_LICENSE("GPL v2");
> +MODULE_DEVICE_TABLE(of, tegra_nand_of_match);
>
On 28.05.2018 00:19, Miquel Raynal wrote:
> Hi Stefan,
>
> A few more comments here.
>
> On Sun, 27 May 2018 23:54:39 +0200, Stefan Agner <[email protected]>
> wrote:
>
>> Add support for the NAND flash controller found on NVIDIA
>> Tegra 2 SoCs. This implementation does not make use of the
>> command queue feature. Regular operations/data transfers are
>> done in PIO mode. Page read/writes with hardware ECC make
>> use of the DMA for data transfer.
>>
>> Signed-off-by: Lucas Stach <[email protected]>
>> Signed-off-by: Stefan Agner <[email protected]>
>> ---
>> MAINTAINERS | 7 +
>> drivers/mtd/nand/raw/Kconfig | 6 +
>> drivers/mtd/nand/raw/Makefile | 1 +
>> drivers/mtd/nand/raw/tegra_nand.c | 999 ++++++++++++++++++++++++++++++
>> 4 files changed, 1013 insertions(+)
>> create mode 100644 drivers/mtd/nand/raw/tegra_nand.c
>>
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index 58b9861ccf99..8cbbb7111742 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -13844,6 +13844,13 @@ M: Laxman Dewangan <[email protected]>
>> S: Supported
>> F: drivers/input/keyboard/tegra-kbc.c
>>
>> +TEGRA NAND DRIVER
>> +M: Stefan Agner <[email protected]>
>> +M: Lucas Stach <[email protected]>
>> +S: Maintained
>> +F: Documentation/devicetree/bindings/mtd/nvidia,tegra20-nand.txt
>
> I think most MTD bindings use '-' instead of ','. I don't have a
> preference, it's just for coherence.
>
Sure, will use a dash.
>> +F: drivers/mtd/nand/raw/tegra_nand.c
>> +
>> TEGRA PWM DRIVER
>> M: Thierry Reding <[email protected]>
>> S: Supported
>> diff --git a/drivers/mtd/nand/raw/Kconfig b/drivers/mtd/nand/raw/Kconfig
>> index 19a2b283fbbe..012c63c6ab47 100644
>> --- a/drivers/mtd/nand/raw/Kconfig
>> +++ b/drivers/mtd/nand/raw/Kconfig
>> @@ -534,4 +534,10 @@ config MTD_NAND_MTK
>> Enables support for NAND controller on MTK SoCs.
>> This controller is found on mt27xx, mt81xx, mt65xx SoCs.
>>
>> +config MTD_NAND_TEGRA
>> + tristate "Support for NAND on NVIDIA Tegra"
>> + depends on ARCH_TEGRA || COMPILE_TEST
>> + help
>> + Enables support for NAND flash on NVIDIA Tegra SoC based boards.
>
> Please make the term "controller" appear because it's mostly a
> controller driver that you're adding.
>
Ok.
>> +
>> endif # MTD_NAND
>> diff --git a/drivers/mtd/nand/raw/Makefile b/drivers/mtd/nand/raw/Makefile
>> index 165b7ef9e9a1..d5a5f9832b88 100644
>> --- a/drivers/mtd/nand/raw/Makefile
>> +++ b/drivers/mtd/nand/raw/Makefile
>> @@ -56,6 +56,7 @@ obj-$(CONFIG_MTD_NAND_HISI504) += hisi504_nand.o
>> obj-$(CONFIG_MTD_NAND_BRCMNAND) += brcmnand/
>> obj-$(CONFIG_MTD_NAND_QCOM) += qcom_nandc.o
>> obj-$(CONFIG_MTD_NAND_MTK) += mtk_ecc.o mtk_nand.o
>> +obj-$(CONFIG_MTD_NAND_TEGRA) += tegra_nand.o
>>
>> nand-objs := nand_base.o nand_bbt.o nand_timings.o nand_ids.o
>> nand-objs += nand_amd.o
>
> [...]
>
>> +static int tegra_nand_setup_data_interface(struct mtd_info *mtd, int csline,
>> + const struct nand_data_interface *conf)
>> +{
>> + struct nand_chip *chip = mtd_to_nand(mtd);
>> + struct tegra_nand_controller *ctrl = to_tegra_ctrl(chip->controller);
>> + const struct nand_sdr_timings *timings;
>> +
>> + timings = nand_get_sdr_timings(conf);
>> + if (IS_ERR(timings))
>> + return PTR_ERR(timings);
>> +
>> + if (csline == NAND_DATA_IFACE_CHECK_ONLY)
>> + return 0;
>> +
>> + tegra_nand_setup_timing(ctrl, timings);
>
> Is this indirection really needed?
>
This evolved due to historic reasons, will get rid of it.
>> +
>> + return 0;
>> +}
>> +
>> +static int tegra_nand_chips_init(struct device *dev,
>> + struct tegra_nand_controller *ctrl)
>> +{
>> + struct device_node *np = dev->of_node;
>> + struct device_node *np_nand;
>> + int nchips = of_get_child_count(np);
>> + struct tegra_nand_chip *nand;
>> + struct mtd_info *mtd;
>> + struct nand_chip *chip;
>> + unsigned long config, bch_config = 0;
>> + int bits_per_step;
>> + int err;
>> +
>> + if (nchips != 1) {
>> + dev_err(dev, "currently only one NAND chip supported\n");
>> + return -EINVAL;
>> + }
>> +
>> + np_nand = of_get_next_child(np, NULL);
>> +
>> + nand = devm_kzalloc(dev, sizeof(*nand), GFP_KERNEL);
>> + if (!nand) {
>> + dev_err(dev, "could not allocate chip structure\n");
>> + return -ENOMEM;
>> + }
>> +
>> + nand->wp_gpio = devm_gpiod_get_optional(dev, "wp", GPIOD_OUT_LOW);
>> +
>> + if (IS_ERR(nand->wp_gpio)) {
>> + err = PTR_ERR(nand->wp_gpio);
>> + dev_err(dev, "failed to request WP GPIO: %d\n", err);
>> + return err;
>> + }
>> +
>> + chip = &nand->chip;
>> + chip->controller = &ctrl->controller;
>> + ctrl->chip = chip;
>> +
>> + mtd = nand_to_mtd(chip);
>> +
>> + mtd->dev.parent = dev;
>> + mtd->name = "tegra_nand";
>> + mtd->owner = THIS_MODULE;
>> +
>> + nand_set_flash_node(chip, np_nand);
>> +
>> + chip->options = NAND_NO_SUBPAGE_WRITE | NAND_USE_BOUNCE_BUFFER;
>> + chip->exec_op = tegra_nand_exec_op;
>> + chip->select_chip = tegra_nand_select_chip;
>> + chip->setup_data_interface = tegra_nand_setup_data_interface;
>> +
>> + err = nand_scan_ident(mtd, 1, NULL);
>> + if (err)
>> + return err;
>> +
>> + if (chip->bbt_options & NAND_BBT_USE_FLASH)
>> + chip->bbt_options |= NAND_BBT_NO_OOB;
>> +
>> + chip->ecc.mode = NAND_ECC_HW;
>> + if (!chip->ecc.size)
>> + chip->ecc.size = 512;
>> + if (chip->ecc.size != 512)
>> + return -EINVAL;
>
> This is useless. You can force ecc.size to 512 and forget about the DT
> property (please update the DT bindings).
>
Ok.
>> +
>> + chip->ecc.read_page = tegra_nand_read_page_hwecc;
>> + chip->ecc.write_page = tegra_nand_write_page_hwecc;
>> + /* Not functional for unknown reason...
>> + chip->ecc.read_page_raw = tegra_nand_read_page;
>> + chip->ecc.write_page_raw = tegra_nand_write_page;
>
> Please add the _raw suffix to these helpers.
>
They are also used from tegra_nand_read_page_hwecc, that is why I was
hesitant to add _raw...
>> + */
>> + config = readl(ctrl->regs + CFG);
>> + config |= CFG_PIPE_EN | CFG_SKIP_SPARE | CFG_SKIP_SPARE_SIZE_4;
>> +
>> + if (chip->options & NAND_BUSWIDTH_16)
>> + config |= CFG_BUS_WIDTH_16;
>> +
>> + switch (chip->ecc.algo) {
>> + case NAND_ECC_RS:
>> + bits_per_step = BITS_PER_STEP_RS * chip->ecc.strength;
>> + mtd_set_ooblayout(mtd, &tegra_nand_oob_rs_ops);
>> + switch (chip->ecc.strength) {
>> + case 4:
>> + config |= CFG_ECC_SEL | CFG_TVAL_4;
>> + break;
>> + case 6:
>> + config |= CFG_ECC_SEL | CFG_TVAL_6;
>> + break;
>> + case 8:
>> + config |= CFG_ECC_SEL | CFG_TVAL_8;
>> + break;
>> + default:
>> + dev_err(dev, "ECC strength %d not supported\n",
>> + chip->ecc.strength);
>> + return -EINVAL;
>> + }
>> + break;
>> + case NAND_ECC_BCH:
>> + bits_per_step = BITS_PER_STEP_BCH * chip->ecc.strength;
>> + mtd_set_ooblayout(mtd, &tegra_nand_oob_bch_ops);
>> + switch (chip->ecc.strength) {
>> + case 4:
>> + bch_config = BCH_TVAL_4;
>> + break;
>> + case 8:
>> + bch_config = BCH_TVAL_8;
>> + break;
>> + case 14:
>> + bch_config = BCH_TVAL_14;
>> + break;
>> + case 16:
>> + bch_config = BCH_TVAL_16;
>> + break;
>> + default:
>> + dev_err(dev, "ECC strength %d not supported\n",
>> + chip->ecc.strength);
>> + return -EINVAL;
>> + }
>> + break;
>> + default:
>> + dev_err(dev, "ECC algorithm not supported\n");
>> + return -EINVAL;
>> + }
>> +
>> + chip->ecc.bytes = DIV_ROUND_UP(bits_per_step, 8);
>> +
>> + switch (mtd->writesize) {
>> + case 256:
>> + config |= CFG_PS_256;
>> + break;
>> + case 512:
>> + config |= CFG_PS_512;
>> + break;
>> + case 1024:
>> + config |= CFG_PS_1024;
>> + break;
>> + case 2048:
>> + config |= CFG_PS_2048;
>> + break;
>> + case 4096:
>> + config |= CFG_PS_4096;
>> + break;
>> + default:
>> + dev_err(dev, "unhandled writesize %d\n", mtd->writesize);
>> + return -ENODEV;
>> + }
>> +
>> + writel(config, ctrl->regs + CFG);
>> + writel(bch_config, ctrl->regs + BCH_CONFIG);
>> +
>> + err = nand_scan_tail(mtd);
>> + if (err)
>> + return err;
>> +
>> + config |= CFG_TAG_BYTE_SIZE(mtd_ooblayout_count_freebytes(mtd) - 1);
>> + writel(config, ctrl->regs + CFG);
>> +
>> + err = mtd_device_register(mtd, NULL, 0);
>> + if (err)
>
> Missing nand_cleanup() in the error path.
>
Ok.
--
Stefan
>> + return err;
>> +
>> + return 0;
>> +}
>> +
>
> [...]
On 28.05.2018 13:57, Dmitry Osipenko wrote:
> On 28.05.2018 00:54, Stefan Agner wrote:
>> Add support for the NAND flash controller found on NVIDIA
>> Tegra 2 SoCs. This implementation does not make use of the
>> command queue feature. Regular operations/data transfers are
>> done in PIO mode. Page read/writes with hardware ECC make
>> use of the DMA for data transfer.
>>
>> Signed-off-by: Lucas Stach <[email protected]>
>> Signed-off-by: Stefan Agner <[email protected]>
>> ---
>> MAINTAINERS | 7 +
>> drivers/mtd/nand/raw/Kconfig | 6 +
>> drivers/mtd/nand/raw/Makefile | 1 +
>> drivers/mtd/nand/raw/tegra_nand.c | 999 ++++++++++++++++++++++++++++++
>> 4 files changed, 1013 insertions(+)
>> create mode 100644 drivers/mtd/nand/raw/tegra_nand.c
>>
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index 58b9861ccf99..8cbbb7111742 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -13844,6 +13844,13 @@ M: Laxman Dewangan <[email protected]>
>> S: Supported
>> F: drivers/input/keyboard/tegra-kbc.c
>>
>> +TEGRA NAND DRIVER
>> +M: Stefan Agner <[email protected]>
>> +M: Lucas Stach <[email protected]>
>> +S: Maintained
>> +F: Documentation/devicetree/bindings/mtd/nvidia,tegra20-nand.txt
>> +F: drivers/mtd/nand/raw/tegra_nand.c
>> +
>> TEGRA PWM DRIVER
>> M: Thierry Reding <[email protected]>
>> S: Supported
>> diff --git a/drivers/mtd/nand/raw/Kconfig b/drivers/mtd/nand/raw/Kconfig
>> index 19a2b283fbbe..012c63c6ab47 100644
>> --- a/drivers/mtd/nand/raw/Kconfig
>> +++ b/drivers/mtd/nand/raw/Kconfig
>> @@ -534,4 +534,10 @@ config MTD_NAND_MTK
>> Enables support for NAND controller on MTK SoCs.
>> This controller is found on mt27xx, mt81xx, mt65xx SoCs.
>>
>> +config MTD_NAND_TEGRA
>> + tristate "Support for NAND on NVIDIA Tegra"
>> + depends on ARCH_TEGRA || COMPILE_TEST
>> + help
>> + Enables support for NAND flash on NVIDIA Tegra SoC based boards.
>> +
>> endif # MTD_NAND
>> diff --git a/drivers/mtd/nand/raw/Makefile b/drivers/mtd/nand/raw/Makefile
>> index 165b7ef9e9a1..d5a5f9832b88 100644
>> --- a/drivers/mtd/nand/raw/Makefile
>> +++ b/drivers/mtd/nand/raw/Makefile
>> @@ -56,6 +56,7 @@ obj-$(CONFIG_MTD_NAND_HISI504) += hisi504_nand.o
>> obj-$(CONFIG_MTD_NAND_BRCMNAND) += brcmnand/
>> obj-$(CONFIG_MTD_NAND_QCOM) += qcom_nandc.o
>> obj-$(CONFIG_MTD_NAND_MTK) += mtk_ecc.o mtk_nand.o
>> +obj-$(CONFIG_MTD_NAND_TEGRA) += tegra_nand.o
>>
>> nand-objs := nand_base.o nand_bbt.o nand_timings.o nand_ids.o
>> nand-objs += nand_amd.o
>> diff --git a/drivers/mtd/nand/raw/tegra_nand.c b/drivers/mtd/nand/raw/tegra_nand.c
>> new file mode 100644
>> index 000000000000..1a0833d97472
>> --- /dev/null
>> +++ b/drivers/mtd/nand/raw/tegra_nand.c
>> @@ -0,0 +1,999 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * Copyright (C) 2018 Stefan Agner <[email protected]>
>> + * Copyright (C) 2014-2015 Lucas Stach <[email protected]>
>> + * Copyright (C) 2012 Avionic Design GmbH
>> + */
>> +
>> +#include <linux/clk.h>
>> +#include <linux/completion.h>
>> +#include <linux/delay.h>
>> +#include <linux/dma-mapping.h>
>> +#include <linux/err.h>
>> +#include <linux/gpio/consumer.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/io.h>
>> +#include <linux/module.h>
>> +#include <linux/mtd/partitions.h>
>> +#include <linux/mtd/rawnand.h>
>> +#include <linux/of.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/reset.h>
>> +
>> +#define CMD 0x00
>> +#define CMD_GO (1 << 31)
>> +#define CMD_CLE (1 << 30)
>> +#define CMD_ALE (1 << 29)
>> +#define CMD_PIO (1 << 28)
>> +#define CMD_TX (1 << 27)
>> +#define CMD_RX (1 << 26)
>> +#define CMD_SEC_CMD (1 << 25)
>> +#define CMD_AFT_DAT (1 << 24)
>> +#define CMD_TRANS_SIZE(x) (((x - 1) & 0xf) << 20)
>> +#define CMD_A_VALID (1 << 19)
>> +#define CMD_B_VALID (1 << 18)
>> +#define CMD_RD_STATUS_CHK (1 << 17)
>> +#define CMD_RBSY_CHK (1 << 16)
>> +#define CMD_CE(x) (1 << (8 + ((x) & 0x7)))
>> +#define CMD_CLE_SIZE(x) (((x - 1) & 0x3) << 4)
>> +#define CMD_ALE_SIZE(x) (((x - 1) & 0xf) << 0)
>> +
>> +#define STATUS 0x04
>> +
>> +#define ISR 0x08
>> +#define ISR_CORRFAIL_ERR (1 << 24)
>> +#define ISR_UND (1 << 7)
>> +#define ISR_OVR (1 << 6)
>> +#define ISR_CMD_DONE (1 << 5)
>> +#define ISR_ECC_ERR (1 << 4)
>> +
>> +#define IER 0x0c
>> +#define IER_ERR_TRIG_VAL(x) (((x) & 0xf) << 16)
>> +#define IER_UND (1 << 7)
>> +#define IER_OVR (1 << 6)
>> +#define IER_CMD_DONE (1 << 5)
>> +#define IER_ECC_ERR (1 << 4)
>> +#define IER_GIE (1 << 0)
>> +
>> +#define CFG 0x10
>> +#define CFG_HW_ECC (1 << 31)
>> +#define CFG_ECC_SEL (1 << 30)
>> +#define CFG_ERR_COR (1 << 29)
>> +#define CFG_PIPE_EN (1 << 28)
>> +#define CFG_TVAL_4 (0 << 24)
>> +#define CFG_TVAL_6 (1 << 24)
>> +#define CFG_TVAL_8 (2 << 24)
>> +#define CFG_SKIP_SPARE (1 << 23)
>> +#define CFG_BUS_WIDTH_8 (0 << 21)
>> +#define CFG_BUS_WIDTH_16 (1 << 21)
>> +#define CFG_COM_BSY (1 << 20)
>> +#define CFG_PS_256 (0 << 16)
>> +#define CFG_PS_512 (1 << 16)
>> +#define CFG_PS_1024 (2 << 16)
>> +#define CFG_PS_2048 (3 << 16)
>> +#define CFG_PS_4096 (4 << 16)
>> +#define CFG_SKIP_SPARE_SIZE_4 (0 << 14)
>> +#define CFG_SKIP_SPARE_SIZE_8 (1 << 14)
>> +#define CFG_SKIP_SPARE_SIZE_12 (2 << 14)
>> +#define CFG_SKIP_SPARE_SIZE_16 (3 << 14)
>> +#define CFG_TAG_BYTE_SIZE(x) ((x) & 0xff)
>> +
>> +#define TIMING_1 0x14
>> +#define TIMING_TRP_RESP(x) (((x) & 0xf) << 28)
>> +#define TIMING_TWB(x) (((x) & 0xf) << 24)
>> +#define TIMING_TCR_TAR_TRR(x) (((x) & 0xf) << 20)
>> +#define TIMING_TWHR(x) (((x) & 0xf) << 16)
>> +#define TIMING_TCS(x) (((x) & 0x3) << 14)
>> +#define TIMING_TWH(x) (((x) & 0x3) << 12)
>> +#define TIMING_TWP(x) (((x) & 0xf) << 8)
>> +#define TIMING_TRH(x) (((x) & 0xf) << 4)
>> +#define TIMING_TRP(x) (((x) & 0xf) << 0)
>> +
>> +#define RESP 0x18
>> +
>> +#define TIMING_2 0x1c
>> +#define TIMING_TADL(x) ((x) & 0xf)
>> +
>> +#define CMD_1 0x20
>> +#define CMD_2 0x24
>> +#define ADDR_1 0x28
>> +#define ADDR_2 0x2c
>> +
>> +#define DMA_CTRL 0x30
>> +#define DMA_CTRL_GO (1 << 31)
>> +#define DMA_CTRL_IN (0 << 30)
>> +#define DMA_CTRL_OUT (1 << 30)
>> +#define DMA_CTRL_PERF_EN (1 << 29)
>> +#define DMA_CTRL_IE_DONE (1 << 28)
>> +#define DMA_CTRL_REUSE (1 << 27)
>> +#define DMA_CTRL_BURST_1 (2 << 24)
>> +#define DMA_CTRL_BURST_4 (3 << 24)
>> +#define DMA_CTRL_BURST_8 (4 << 24)
>> +#define DMA_CTRL_BURST_16 (5 << 24)
>> +#define DMA_CTRL_IS_DONE (1 << 20)
>> +#define DMA_CTRL_EN_A (1 << 2)
>> +#define DMA_CTRL_EN_B (1 << 1)
>> +
>> +#define DMA_CFG_A 0x34
>> +#define DMA_CFG_B 0x38
>> +
>> +#define FIFO_CTRL 0x3c
>> +#define FIFO_CTRL_CLR_ALL (1 << 3)
>> +
>> +#define DATA_PTR 0x40
>> +#define TAG_PTR 0x44
>> +#define ECC_PTR 0x48
>> +
>> +#define DEC_STATUS 0x4c
>> +#define DEC_STATUS_A_ECC_FAIL (1 << 1)
>> +#define DEC_STATUS_ERR_COUNT_MASK 0x00ff0000
>> +#define DEC_STATUS_ERR_COUNT_SHIFT 16
>> +
>> +#define HWSTATUS_CMD 0x50
>> +#define HWSTATUS_MASK 0x54
>> +#define HWSTATUS_RDSTATUS_MASK(x) (((x) & 0xff) << 24)
>> +#define HWSTATUS_RDSTATUS_VALUE(x) (((x) & 0xff) << 16)
>> +#define HWSTATUS_RBSY_MASK(x) (((x) & 0xff) << 8)
>> +#define HWSTATUS_RBSY_VALUE(x) (((x) & 0xff) << 0)
>> +
>> +#define BCH_CONFIG 0xcc
>> +#define BCH_ENABLE (1 << 0)
>> +#define BCH_TVAL_4 (0 << 4)
>> +#define BCH_TVAL_8 (1 << 4)
>> +#define BCH_TVAL_14 (2 << 4)
>> +#define BCH_TVAL_16 (3 << 4)
>> +
>> +#define DEC_STAT_RESULT 0xd0
>> +#define DEC_STAT_BUF 0xd4
>> +#define DEC_STAT_BUF_FAIL_SEC_FLAG_MASK 0xff000000
>> +#define DEC_STAT_BUF_FAIL_SEC_FLAG_SHIFT 24
>> +#define DEC_STAT_BUF_CORR_SEC_FLAG_MASK 0x00ff0000
>> +#define DEC_STAT_BUF_CORR_SEC_FLAG_SHIFT 16
>> +#define DEC_STAT_BUF_MAX_CORR_CNT_MASK 0x00001f00
>> +#define DEC_STAT_BUF_MAX_CORR_CNT_SHIFT 8
>> +
>> +#define SKIP_SPARE_BYTES 4
>> +#define BITS_PER_STEP_RS 18
>> +#define BITS_PER_STEP_BCH 13
>> +
>> +struct tegra_nand_controller {
>> + struct nand_hw_control controller;
>> + void __iomem *regs;
>> + struct clk *clk;
>> + struct device *dev;
>> + struct completion command_complete;
>> + struct completion dma_complete;
>> + bool last_read_error;
>> + int cur_chip;
>> + struct nand_chip *chip;
>> +};
>> +
>> +struct tegra_nand_chip {
>> + struct nand_chip chip;
>> + struct gpio_desc *wp_gpio;
>> +};
>> +
>> +static inline struct tegra_nand_controller *to_tegra_ctrl(
>> + struct nand_hw_control *hw_ctrl)
>> +{
>> + return container_of(hw_ctrl, struct tegra_nand_controller, controller);
>> +}
>> +
>> +static int tegra_nand_ooblayout_rs_ecc(struct mtd_info *mtd, int section,
>> + struct mtd_oob_region *oobregion)
>> +{
>> + struct nand_chip *chip = mtd_to_nand(mtd);
>> + int bytes_per_step = (BITS_PER_STEP_RS * chip->ecc.strength) / 8;
>> +
>> + if (section > 0)
>> + return -ERANGE;
>> +
>> + oobregion->offset = SKIP_SPARE_BYTES;
>> + oobregion->length = round_up(bytes_per_step * chip->ecc.steps, 4);
>> +
>> + return 0;
>> +}
>> +
>> +static int tegra_nand_ooblayout_rs_free(struct mtd_info *mtd, int section,
>> + struct mtd_oob_region *oobregion)
>> +{
>> + struct nand_chip *chip = mtd_to_nand(mtd);
>> + int bytes_per_step = DIV_ROUND_UP(BITS_PER_STEP_RS * chip->ecc.strength, 8);
>> +
>> + if (section > 0)
>> + return -ERANGE;
>> +
>> + oobregion->offset = SKIP_SPARE_BYTES +
>> + round_up(bytes_per_step * chip->ecc.steps, 4);
>> + oobregion->length = mtd->oobsize - oobregion->offset;
>> +
>> + return 0;
>> +}
>> +
>> +static const struct mtd_ooblayout_ops tegra_nand_oob_rs_ops = {
>> + .ecc = tegra_nand_ooblayout_rs_ecc,
>> + .free = tegra_nand_ooblayout_rs_free,
>> +};
>> +
>> +static int tegra_nand_ooblayout_bch_ecc(struct mtd_info *mtd, int section,
>> + struct mtd_oob_region *oobregion)
>> +{
>> + struct nand_chip *chip = mtd_to_nand(mtd);
>> + int bytes_per_step = DIV_ROUND_UP(BITS_PER_STEP_BCH * chip->ecc.strength, 8);
>> +
>> + if (section > 0)
>> + return -ERANGE;
>> +
>> + oobregion->offset = SKIP_SPARE_BYTES;
>> + oobregion->length = round_up(bytes_per_step * chip->ecc.steps, 4);
>> +
>> + return 0;
>> +}
>> +
>> +static int tegra_nand_ooblayout_bch_free(struct mtd_info *mtd, int section,
>> + struct mtd_oob_region *oobregion)
>> +{
>> + struct nand_chip *chip = mtd_to_nand(mtd);
>> + int bytes_per_step = (BITS_PER_STEP_BCH * chip->ecc.strength) / 8;
>> +
>> + if (section > 0)
>> + return -ERANGE;
>> +
>> + oobregion->offset = SKIP_SPARE_BYTES +
>> + round_up(bytes_per_step * chip->ecc.steps, 4);
>> + oobregion->length = mtd->oobsize - oobregion->offset;
>> +
>> + return 0;
>> +}
>> +
>> +/*
>> + * Layout with tag bytes is
>> + *
>> + * --------------------------------------------------------------------------
>> + * | main area | skip bytes | tag bytes | parity | .. |
>> + * --------------------------------------------------------------------------
>> + *
>> + * If not tag bytes are written, parity moves right after skip bytes!
>> + */
>> +static const struct mtd_ooblayout_ops tegra_nand_oob_bch_ops = {
>> + .ecc = tegra_nand_ooblayout_bch_ecc,
>> + .free = tegra_nand_ooblayout_bch_free,
>> +};
>> +
>> +static irqreturn_t tegra_nand_irq(int irq, void *data)
>> +{
>> + struct tegra_nand_controller *ctrl = data;
>> + u32 isr, dma;
>> +
>> + isr = readl_relaxed(ctrl->regs + ISR);
>> + dma = readl_relaxed(ctrl->regs + DMA_CTRL);
>> + dev_dbg(ctrl->dev, "isr %08x\n", isr);
>> +
>> + if (!isr && !(dma & DMA_CTRL_IS_DONE))
>> + return IRQ_NONE;
>> +
>> + if (isr & ISR_CORRFAIL_ERR)
>> + ctrl->last_read_error = true;
>> +
>> + if (isr & ISR_CMD_DONE)
>> + complete(&ctrl->command_complete);
>> +
>> + if (isr & ISR_UND)
>> + dev_dbg(ctrl->dev, "FIFO underrun\n");
>> +
>> + if (isr & ISR_OVR)
>> + dev_dbg(ctrl->dev, "FIFO overrun\n");
>> +
>> + /* handle DMA interrupts */
>> + if (dma & DMA_CTRL_IS_DONE) {
>> + writel(dma, ctrl->regs + DMA_CTRL);
>> + complete(&ctrl->dma_complete);
>> + }
>> +
>> + /* clear interrupts */
>> + writel(isr, ctrl->regs + ISR);
>> +
>> + return IRQ_HANDLED;
>> +}
>> +
>> +static int tegra_nand_cmd(struct nand_chip *chip,
>> + const struct nand_subop *subop)
>> +{
>> + const struct nand_op_instr *instr;
>> + const struct nand_op_instr *instr_data_in = NULL;
>> + struct tegra_nand_controller *ctrl = to_tegra_ctrl(chip->controller);
>> + unsigned int op_id = -1, trfr_in_sz = 0, trfr_out_sz = 0, offset = 0;
>> + bool first_cmd = true;
>> + u32 cmd = 0;
>> + u32 value;
>> +
>> + for (op_id = 0; op_id < subop->ninstrs; op_id++) {
>> + unsigned int naddrs, i;
>> + const u8 *addrs;
>> + u32 addr1 = 0, addr2 = 0;
>> +
>> + instr = &subop->instrs[op_id];
>> +
>> + switch (instr->type) {
>> + case NAND_OP_CMD_INSTR:
>> + if (first_cmd) {
>> + cmd |= CMD_CLE;
>> + writel(instr->ctx.cmd.opcode, ctrl->regs + CMD_1);
>> + } else {
>> + cmd |= CMD_SEC_CMD;
>> + writel(instr->ctx.cmd.opcode, ctrl->regs + CMD_2);
>> + }
>> + first_cmd = false;
>> + break;
>> + case NAND_OP_ADDR_INSTR:
>> + offset = nand_subop_get_addr_start_off(subop, op_id);
>> + naddrs = nand_subop_get_num_addr_cyc(subop, op_id);
>> + addrs = &instr->ctx.addr.addrs[offset];
>> +
>> + cmd |= CMD_ALE | CMD_ALE_SIZE(naddrs);
>> + for (i = 0; i < min_t(unsigned int, 4, naddrs); i++)
>> + addr1 |= *addrs++ << (8 * i);
>> + naddrs -= i;
>> + for (i = 0; i < min_t(unsigned int, 4, naddrs); i++)
>> + addr2 |= *addrs++ << (8 * i);
>> + writel(addr1, ctrl->regs + ADDR_1);
>> + writel(addr2, ctrl->regs + ADDR_2);
>> + break;
>> +
>> + case NAND_OP_DATA_IN_INSTR:
>> + trfr_in_sz = nand_subop_get_data_len(subop, op_id);
>> + offset = nand_subop_get_data_start_off(subop, op_id);
>> +
>> + cmd |= CMD_TRANS_SIZE(trfr_in_sz) | CMD_PIO | CMD_RX | CMD_A_VALID;
>> +
>> + instr_data_in = instr;
>> + break;
>> +
>> + case NAND_OP_DATA_OUT_INSTR:
>> + trfr_out_sz = nand_subop_get_data_len(subop, op_id);
>> + offset = nand_subop_get_data_start_off(subop, op_id);
>> + trfr_out_sz = min_t(size_t, trfr_out_sz, 4);
>> +
>> + cmd |= CMD_TRANS_SIZE(trfr_out_sz) | CMD_PIO | CMD_TX | CMD_A_VALID;
>> +
>> + memcpy(&value, instr->ctx.data.buf.out + offset, trfr_out_sz);
>> + writel(value, ctrl->regs + RESP);
>> +
>> + break;
>> + case NAND_OP_WAITRDY_INSTR:
>> + cmd |= CMD_RBSY_CHK;
>> + break;
>> +
>> + }
>> + }
>> +
>> +
>> + cmd |= CMD_GO | CMD_CE(ctrl->cur_chip);
>> + writel(cmd, ctrl->regs + CMD);
>> + wait_for_completion(&ctrl->command_complete);
>
> Could this and other completions stuck forever? What about
> wait_for_completion_timeout() + HW reset / re-init on timeout?
>
They actually get stuck forever when I try to use DMA without HW ECC...
I haven't seen it with HW ECC.
But yes, _timeout variant makes sense here. Not sure if re-init is
necessary since we rewrite all the relevant settings.
>> +
>> + if (instr_data_in) {
>> + u32 value;
>> + size_t n = min_t(size_t, trfr_in_sz, 4);
>> +
>> + value = readl(ctrl->regs + RESP);
>> + memcpy(instr_data_in->ctx.data.buf.in + offset, &value, n);
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static const struct nand_op_parser tegra_nand_op_parser = NAND_OP_PARSER(
>> + NAND_OP_PARSER_PATTERN(tegra_nand_cmd,
>> + NAND_OP_PARSER_PAT_CMD_ELEM(true),
>> + NAND_OP_PARSER_PAT_ADDR_ELEM(true, 8),
>> + NAND_OP_PARSER_PAT_CMD_ELEM(true),
>> + NAND_OP_PARSER_PAT_WAITRDY_ELEM(true)),
>> + NAND_OP_PARSER_PATTERN(tegra_nand_cmd,
>> + NAND_OP_PARSER_PAT_DATA_OUT_ELEM(false, 4)),
>> + NAND_OP_PARSER_PATTERN(tegra_nand_cmd,
>> + NAND_OP_PARSER_PAT_CMD_ELEM(true),
>> + NAND_OP_PARSER_PAT_ADDR_ELEM(true, 8),
>> + NAND_OP_PARSER_PAT_CMD_ELEM(true),
>> + NAND_OP_PARSER_PAT_WAITRDY_ELEM(true),
>> + NAND_OP_PARSER_PAT_DATA_IN_ELEM(true, 4)),
>> + );
>> +
>> +static int tegra_nand_exec_op(struct nand_chip *chip,
>> + const struct nand_operation *op,
>> + bool check_only)
>> +{
>> + return nand_op_parser_exec_op(chip, &tegra_nand_op_parser, op,
>> + check_only);
>> +}
>> +static void tegra_nand_select_chip(struct mtd_info *mtd, int chip_nr)
>> +{
>> + struct nand_chip *chip = mtd_to_nand(mtd);
>> + struct tegra_nand_controller *ctrl = to_tegra_ctrl(chip->controller);
>> +
>> + ctrl->cur_chip = chip_nr;
>> +}
>> +
>> +static u32 tegra_nand_fill_address(struct tegra_nand_controller *ctrl,
>> + struct nand_chip *chip, int page)
>> +{
>> + /* Lower 16-bits are column, always 0 */
>> + writel(page << 16, ctrl->regs + ADDR_1);
>> +
>> + if (chip->options & NAND_ROW_ADDR_3) {
>> + writel(page >> 16, ctrl->regs + ADDR_2);
>> + return 5;
>> + }
>> +
>> + return 4;
>> +}
>> +
>> +static void tegra_nand_hw_ecc(struct tegra_nand_controller *ctrl,
>> + struct nand_chip *chip, bool enable)
>> +{
>> + u32 value;
>> +
>> + switch (chip->ecc.algo) {
>> + case NAND_ECC_RS:
>> + value = readl(ctrl->regs + CFG);
>> + if (enable)
>> + value |= CFG_HW_ECC | CFG_ERR_COR;
>> + else
>> + value &= ~(CFG_HW_ECC | CFG_ERR_COR);
>> + writel(value, ctrl->regs + CFG);
>> + break;
>> + case NAND_ECC_BCH:
>> + value = readl(ctrl->regs + BCH_CONFIG);
>> + if (enable)
>> + value |= BCH_ENABLE;
>> + else
>> + value &= ~BCH_ENABLE;
>> + writel(value, ctrl->regs + BCH_CONFIG);
>> + break;
>> + default:
>> + dev_err(ctrl->dev, "Unsupported hardware ECC algorithm\n");
>> + break;
>> + }
>> +}
>> +
>> +static int tegra_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
>> + uint8_t *buf, int oob_required, int page)
>> +{
>> + struct tegra_nand_controller *ctrl = to_tegra_ctrl(chip->controller);
>> + dma_addr_t dma_addr;
>> + u32 value, addrs;
>> + int ret, dma_len;
>> +
>> + writel(NAND_CMD_READ0, ctrl->regs + CMD_1);
>> + writel(NAND_CMD_READSTART, ctrl->regs + CMD_2);
>> +
>> + addrs = tegra_nand_fill_address(ctrl, chip, page);
>> +
>> + dma_len = mtd->writesize + (oob_required ? mtd->oobsize : 0);
>> + dma_addr = dma_map_single(ctrl->dev, buf, dma_len, DMA_FROM_DEVICE);
>> + ret = dma_mapping_error(ctrl->dev, dma_addr);
>> + if (ret) {
>> + dev_err(ctrl->dev, "dma mapping error\n");
>> + return -EINVAL;
>> + }
>> +
>> + writel(mtd->writesize - 1, ctrl->regs + DMA_CFG_A);
>> + writel(dma_addr, ctrl->regs + DATA_PTR);
>> +
>> + if (oob_required) {
>> + struct mtd_oob_region oobregion;
>> + dma_addr_t dma_addr_oob = dma_addr + mtd->writesize;
>> +
>> + mtd_ooblayout_free(mtd, 0, &oobregion);
>> +
>> + writel(oobregion.length - 1, ctrl->regs + DMA_CFG_B);
>> + writel(dma_addr_oob + oobregion.offset, ctrl->regs + TAG_PTR);
>> + } else {
>> + writel(0, ctrl->regs + DMA_CFG_B);
>> + writel(0, ctrl->regs + TAG_PTR);
>> + }
>> +
>> + value = DMA_CTRL_GO | DMA_CTRL_IN | DMA_CTRL_PERF_EN |
>> + DMA_CTRL_REUSE | DMA_CTRL_IE_DONE | DMA_CTRL_IS_DONE |
>> + DMA_CTRL_BURST_16 | DMA_CTRL_EN_A;
>> + if (oob_required)
>> + value |= DMA_CTRL_EN_B;
>> + writel(value, ctrl->regs + DMA_CTRL);
>> +
>> + value = CMD_CLE | CMD_ALE | CMD_ALE_SIZE(addrs) | CMD_SEC_CMD |
>> + CMD_RBSY_CHK | CMD_GO | CMD_RX | CMD_TRANS_SIZE(9) |
>> + CMD_A_VALID | CMD_CE(ctrl->cur_chip);
>> + if (oob_required)
>> + value |= CMD_B_VALID;
>> + writel(value, ctrl->regs + CMD);
>> +
>> + wait_for_completion(&ctrl->command_complete);
>> + wait_for_completion(&ctrl->dma_complete);
>> +
>> + dma_unmap_single(ctrl->dev, dma_addr, dma_len, DMA_FROM_DEVICE);
>> +
>> + return 0;
>> +}
>> +
>> +static int tegra_nand_read_page_hwecc(struct mtd_info *mtd,
>> + struct nand_chip *chip,
>> + uint8_t *buf, int oob_required, int page)
>> +{
>> + struct tegra_nand_controller *ctrl = to_tegra_ctrl(chip->controller);
>> + u32 value;
>> + int ret;
>> +
>> + tegra_nand_hw_ecc(ctrl, chip, true);
>> + ret = tegra_nand_read_page(mtd, chip, buf, oob_required, page);
>> + tegra_nand_hw_ecc(ctrl, chip, false);
>> + if (ret)
>> + return ret;
>> +
>> + /* If no correctable or un-correctable errors occured we can return 0 */
>> + if (!ctrl->last_read_error)
>> + return 0;
>> +
>> + /*
>> + * Correctable or un-correctable errors did occure. NAND dec status
>> + * contains information for all ECC selections
>> + */
>> + ctrl->last_read_error = false;
>> + value = readl(ctrl->regs + DEC_STAT_BUF);
>> +
>> + if (value & DEC_STAT_BUF_FAIL_SEC_FLAG_MASK) {
>> + /*
>> + * The ECC isn't smart enough to figure out if a page is
>> + * completely erased and flags an error in this case. So we
>> + * check the read data here to figure out if it's a legitimate
>> + * error or a false positive.
>> + */
>> + int i, ret;
>> + int flips_threshold = chip->ecc.strength / 2;
>> + int max_bitflips = 0;
>> +
>> + for (i = 0; i < chip->ecc.steps; i++) {
>> + u8 *data = buf + (chip->ecc.size * i);
>> +
>> + ret = nand_check_erased_ecc_chunk(data, chip->ecc.size,
>> + NULL, 0,
>> + NULL, 0,
>> + flips_threshold);
>> + if (ret < 0)
>> + mtd->ecc_stats.failed++;
>> + else
>> + max_bitflips = max(ret, max_bitflips);
>> + }
>> +
>> + return max_bitflips;
>> + } else {
>> + int max_corr_cnt, corr_sec_flag;
>> +
>> + corr_sec_flag = (value & DEC_STAT_BUF_CORR_SEC_FLAG_MASK) >>
>> + DEC_STAT_BUF_CORR_SEC_FLAG_SHIFT;
>> + max_corr_cnt = (value & DEC_STAT_BUF_MAX_CORR_CNT_MASK) >>
>> + DEC_STAT_BUF_MAX_CORR_CNT_SHIFT;
>> +
>> + /*
>> + * The value returned in the register is the maximum of
>> + * bitflips encountered in any of the ECC regions. As there is
>> + * no way to get the number of bitflips in a specific regions
>> + * we are not able to deliver correct stats but instead
>> + * overestimate the number of corrected bitflips by assuming
>> + * that all regions where errors have been corrected
>> + * encountered the maximum number of bitflips.
>> + */
>> + mtd->ecc_stats.corrected += max_corr_cnt * hweight8(corr_sec_flag);
>> +
>> + return max_corr_cnt;
>> + }
>> +
>> +}
>> +
>> +static int tegra_nand_write_page(struct mtd_info *mtd, struct nand_chip *chip,
>> + const uint8_t *buf, int oob_required, int page)
>> +{
>> + struct tegra_nand_controller *ctrl = to_tegra_ctrl(chip->controller);
>> + dma_addr_t dma_addr;
>> + u32 value, addrs;
>> + int ret, dma_len;
>> +
>> + writel(NAND_CMD_SEQIN, ctrl->regs + CMD_1);
>> + writel(NAND_CMD_PAGEPROG, ctrl->regs + CMD_2);
>> +
>> + addrs = tegra_nand_fill_address(ctrl, chip, page);
>> +
>> + dma_len = mtd->writesize + (oob_required ? mtd->oobsize : 0);
>> + dma_addr = dma_map_single(ctrl->dev, (void *)buf, dma_len, DMA_TO_DEVICE);
>> + ret = dma_mapping_error(ctrl->dev, dma_addr);
>> + if (ret) {
>> + dev_err(ctrl->dev, "dma mapping error\n");
>> + return -EINVAL;
>> + }
>> +
>> + writel(mtd->writesize - 1, ctrl->regs + DMA_CFG_A);
>> + writel(dma_addr, ctrl->regs + DATA_PTR);
>> +
>> + if (oob_required) {
>> + struct mtd_oob_region oobregion;
>> + dma_addr_t dma_addr_oob = dma_addr + mtd->writesize;
>> +
>> + mtd_ooblayout_free(mtd, 0, &oobregion);
>> +
>> + writel(oobregion.length - 1, ctrl->regs + DMA_CFG_B);
>> + writel(dma_addr_oob + oobregion.offset, ctrl->regs + TAG_PTR);
>> + } else {
>> + writel(0, ctrl->regs + DMA_CFG_B);
>> + writel(0, ctrl->regs + TAG_PTR);
>> + }
>> +
>> + value = DMA_CTRL_GO | DMA_CTRL_OUT | DMA_CTRL_PERF_EN |
>> + DMA_CTRL_IE_DONE | DMA_CTRL_IS_DONE |
>> + DMA_CTRL_BURST_16 | DMA_CTRL_EN_A;
>> + if (oob_required)
>> + value |= DMA_CTRL_EN_B;
>> + writel(value, ctrl->regs + DMA_CTRL);
>> +
>> + value = CMD_CLE | CMD_ALE | CMD_ALE_SIZE(addrs) | CMD_SEC_CMD |
>> + CMD_AFT_DAT | CMD_RBSY_CHK | CMD_GO | CMD_TX | CMD_A_VALID |
>> + CMD_TRANS_SIZE(9) | CMD_CE(ctrl->cur_chip);
>> + if (oob_required)
>> + value |= CMD_B_VALID;
>> + writel(value, ctrl->regs + CMD);
>> +
>> + wait_for_completion(&ctrl->command_complete);
>> + wait_for_completion(&ctrl->dma_complete);
>> +
>> +
>> + dma_unmap_single(ctrl->dev, dma_addr, dma_len, DMA_TO_DEVICE);
>> +
>> + return 0;
>> +}
>> +
>> +static int tegra_nand_write_page_hwecc(struct mtd_info *mtd,
>> + struct nand_chip *chip,
>> + const uint8_t *buf, int oob_required,
>> + int page)
>> +{
>> + struct tegra_nand_controller *ctrl = to_tegra_ctrl(chip->controller);
>> + int ret;
>> +
>> + tegra_nand_hw_ecc(ctrl, chip, true);
>> + ret = tegra_nand_write_page(mtd, chip, buf, oob_required, page);
>> + tegra_nand_hw_ecc(ctrl, chip, false);
>> +
>> + return ret;
>> +}
>> +
>> +static void tegra_nand_setup_timing(struct tegra_nand_controller *ctrl,
>> + const struct nand_sdr_timings *timings)
>> +{
>> + /*
>> + * The period (and all other timings in this function) is in ps,
>> + * so need to take care here to avoid integer overflows.
>> + */
>> + unsigned int rate = clk_get_rate(ctrl->clk) / 1000000;
>> + unsigned int period = DIV_ROUND_UP(1000000, rate);
>> + u32 val, reg = 0;
>> +
>> + val = DIV_ROUND_UP(max3(timings->tAR_min, timings->tRR_min,
>> + timings->tRC_min), period);
>> + if (val > 2)
>> + val -= 3;
>> + reg |= TIMING_TCR_TAR_TRR(val);
>> +
>> + val = DIV_ROUND_UP(max(max(timings->tCS_min, timings->tCH_min),
>> + max(timings->tALS_min, timings->tALH_min)),
>> + period);
>> + if (val > 1)
>> + val -= 2;
>> + reg |= TIMING_TCS(val);
>> +
>> + val = DIV_ROUND_UP(max(timings->tRP_min, timings->tREA_max) + 6000,
>> + period);
>> + reg |= TIMING_TRP(val) | TIMING_TRP_RESP(val);
>> +
>> + reg |= TIMING_TWB(DIV_ROUND_UP(timings->tWB_max, period));
>> + reg |= TIMING_TWHR(DIV_ROUND_UP(timings->tWHR_min, period));
>> + reg |= TIMING_TWH(DIV_ROUND_UP(timings->tWH_min, period));
>> + reg |= TIMING_TWP(DIV_ROUND_UP(timings->tWP_min, period));
>> + reg |= TIMING_TRH(DIV_ROUND_UP(timings->tRHW_min, period));
>> +
>> + writel(reg, ctrl->regs + TIMING_1);
>> +
>> + val = DIV_ROUND_UP(timings->tADL_min, period);
>> + if (val > 2)
>> + val -= 3;
>> + reg = TIMING_TADL(val);
>> +
>> + writel(reg, ctrl->regs + TIMING_2);
>> +}
>> +
>> +static int tegra_nand_setup_data_interface(struct mtd_info *mtd, int csline,
>> + const struct nand_data_interface *conf)
>> +{
>> + struct nand_chip *chip = mtd_to_nand(mtd);
>> + struct tegra_nand_controller *ctrl = to_tegra_ctrl(chip->controller);
>> + const struct nand_sdr_timings *timings;
>> +
>> + timings = nand_get_sdr_timings(conf);
>> + if (IS_ERR(timings))
>> + return PTR_ERR(timings);
>> +
>> + if (csline == NAND_DATA_IFACE_CHECK_ONLY)
>> + return 0;
>> +
>> + tegra_nand_setup_timing(ctrl, timings);
>> +
>> + return 0;
>> +}
>> +
>> +static int tegra_nand_chips_init(struct device *dev,
>> + struct tegra_nand_controller *ctrl)
>> +{
>> + struct device_node *np = dev->of_node;
>> + struct device_node *np_nand;
>> + int nchips = of_get_child_count(np);
>> + struct tegra_nand_chip *nand;
>> + struct mtd_info *mtd;
>> + struct nand_chip *chip;
>> + unsigned long config, bch_config = 0;
>> + int bits_per_step;
>> + int err;
>> +
>> + if (nchips != 1) {
>> + dev_err(dev, "currently only one NAND chip supported\n");
>> + return -EINVAL;
>> + }
>> +
>> + np_nand = of_get_next_child(np, NULL);
>> +
>> + nand = devm_kzalloc(dev, sizeof(*nand), GFP_KERNEL);
>> + if (!nand) {
>> + dev_err(dev, "could not allocate chip structure\n");
>> + return -ENOMEM;
>> + }
>> +
>> + nand->wp_gpio = devm_gpiod_get_optional(dev, "wp", GPIOD_OUT_LOW);
>> +
>> + if (IS_ERR(nand->wp_gpio)) {
>> + err = PTR_ERR(nand->wp_gpio);
>> + dev_err(dev, "failed to request WP GPIO: %d\n", err);
>> + return err;
>> + }
>> +
>> + chip = &nand->chip;
>> + chip->controller = &ctrl->controller;
>> + ctrl->chip = chip;
>> +
>> + mtd = nand_to_mtd(chip);
>> +
>> + mtd->dev.parent = dev;
>> + mtd->name = "tegra_nand";
>> + mtd->owner = THIS_MODULE;
>> +
>> + nand_set_flash_node(chip, np_nand);
>> +
>> + chip->options = NAND_NO_SUBPAGE_WRITE | NAND_USE_BOUNCE_BUFFER;
>> + chip->exec_op = tegra_nand_exec_op;
>> + chip->select_chip = tegra_nand_select_chip;
>> + chip->setup_data_interface = tegra_nand_setup_data_interface;
>> +
>> + err = nand_scan_ident(mtd, 1, NULL);
>> + if (err)
>> + return err;
>> +
>> + if (chip->bbt_options & NAND_BBT_USE_FLASH)
>> + chip->bbt_options |= NAND_BBT_NO_OOB;
>> +
>> + chip->ecc.mode = NAND_ECC_HW;
>> + if (!chip->ecc.size)
>> + chip->ecc.size = 512;
>> + if (chip->ecc.size != 512)
>> + return -EINVAL;
>> +
>> + chip->ecc.read_page = tegra_nand_read_page_hwecc;
>> + chip->ecc.write_page = tegra_nand_write_page_hwecc;
>> + /* Not functional for unknown reason...
>> + chip->ecc.read_page_raw = tegra_nand_read_page;
>> + chip->ecc.write_page_raw = tegra_nand_write_page;
>> + */
>> + config = readl(ctrl->regs + CFG);
>> + config |= CFG_PIPE_EN | CFG_SKIP_SPARE | CFG_SKIP_SPARE_SIZE_4;
>> +
>> + if (chip->options & NAND_BUSWIDTH_16)
>> + config |= CFG_BUS_WIDTH_16;
>> +
>> + switch (chip->ecc.algo) {
>> + case NAND_ECC_RS:
>> + bits_per_step = BITS_PER_STEP_RS * chip->ecc.strength;
>> + mtd_set_ooblayout(mtd, &tegra_nand_oob_rs_ops);
>> + switch (chip->ecc.strength) {
>> + case 4:
>> + config |= CFG_ECC_SEL | CFG_TVAL_4;
>> + break;
>> + case 6:
>> + config |= CFG_ECC_SEL | CFG_TVAL_6;
>> + break;
>> + case 8:
>> + config |= CFG_ECC_SEL | CFG_TVAL_8;
>> + break;
>> + default:
>> + dev_err(dev, "ECC strength %d not supported\n",
>> + chip->ecc.strength);
>> + return -EINVAL;
>> + }
>> + break;
>> + case NAND_ECC_BCH:
>> + bits_per_step = BITS_PER_STEP_BCH * chip->ecc.strength;
>> + mtd_set_ooblayout(mtd, &tegra_nand_oob_bch_ops);
>> + switch (chip->ecc.strength) {
>> + case 4:
>> + bch_config = BCH_TVAL_4;
>> + break;
>> + case 8:
>> + bch_config = BCH_TVAL_8;
>> + break;
>> + case 14:
>> + bch_config = BCH_TVAL_14;
>> + break;
>> + case 16:
>> + bch_config = BCH_TVAL_16;
>> + break;
>> + default:
>> + dev_err(dev, "ECC strength %d not supported\n",
>> + chip->ecc.strength);
>> + return -EINVAL;
>> + }
>> + break;
>> + default:
>> + dev_err(dev, "ECC algorithm not supported\n");
>> + return -EINVAL;
>> + }
>> +
>> + chip->ecc.bytes = DIV_ROUND_UP(bits_per_step, 8);
>> +
>> + switch (mtd->writesize) {
>> + case 256:
>> + config |= CFG_PS_256;
>> + break;
>> + case 512:
>> + config |= CFG_PS_512;
>> + break;
>> + case 1024:
>> + config |= CFG_PS_1024;
>> + break;
>> + case 2048:
>> + config |= CFG_PS_2048;
>> + break;
>> + case 4096:
>> + config |= CFG_PS_4096;
>> + break;
>> + default:
>> + dev_err(dev, "unhandled writesize %d\n", mtd->writesize);
>> + return -ENODEV;
>> + }
>> +
>> + writel(config, ctrl->regs + CFG);
>> + writel(bch_config, ctrl->regs + BCH_CONFIG);
>> +
>> + err = nand_scan_tail(mtd);
>> + if (err)
>> + return err;
>> +
>> + config |= CFG_TAG_BYTE_SIZE(mtd_ooblayout_count_freebytes(mtd) - 1);
>> + writel(config, ctrl->regs + CFG);
>> +
>> + err = mtd_device_register(mtd, NULL, 0);
>> + if (err)
>> + return err;
>> +
>> + return 0;
>> +}
>> +
>> +static int tegra_nand_probe(struct platform_device *pdev)
>> +{
>> + struct reset_control *rst;
>> + struct tegra_nand_controller *ctrl;
>> + struct resource *res;
>> + unsigned long value;
>> + int irq, err = 0;
>> +
>> + ctrl = devm_kzalloc(&pdev->dev, sizeof(*ctrl), GFP_KERNEL);
>> + if (!ctrl)
>> + return -ENOMEM;
>> +
>> + ctrl->dev = &pdev->dev;
>> + nand_hw_control_init(&ctrl->controller);
>> +
>> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> + ctrl->regs = devm_ioremap_resource(&pdev->dev, res);
>> + if (IS_ERR(ctrl->regs))
>> + return PTR_ERR(ctrl->regs);
>> +
>> + rst = devm_reset_control_get(&pdev->dev, "nand");
>> + if (IS_ERR(rst))
>> + return PTR_ERR(rst);
>> +
>> + ctrl->clk = devm_clk_get(&pdev->dev, "nand");
>> + if (IS_ERR(ctrl->clk))
>> + return PTR_ERR(ctrl->clk);
>> +
>> + err = clk_prepare_enable(ctrl->clk);
>> + if (err)
>> + return err;
>> +
>> + reset_control_reset(rst);
>
> Technically reset_control_reset() could fail, so this should be:
>
> err = reset_control_reset(rst);
> if (err)
> goto err_disable_clk;
>
Ok.
--
Stefan
>> +
>> + value = HWSTATUS_RDSTATUS_MASK(1) | HWSTATUS_RDSTATUS_VALUE(0) |
>> + HWSTATUS_RBSY_MASK(NAND_STATUS_READY) |
>> + HWSTATUS_RBSY_VALUE(NAND_STATUS_READY);
>> + writel(NAND_CMD_STATUS, ctrl->regs + HWSTATUS_CMD);
>> + writel(value, ctrl->regs + HWSTATUS_MASK);
>> +
>> + init_completion(&ctrl->command_complete);
>> + init_completion(&ctrl->dma_complete);
>> +
>> + /* clear interrupts */
>> + value = readl(ctrl->regs + ISR);
>> + writel(value, ctrl->regs + ISR);
>> +
>> + irq = platform_get_irq(pdev, 0);
>> + err = devm_request_irq(&pdev->dev, irq, tegra_nand_irq, 0,
>> + dev_name(&pdev->dev), ctrl);
>> + if (err)
>> + goto err_disable_clk;
>> +
>> + writel(DMA_CTRL_IS_DONE, ctrl->regs + DMA_CTRL);
>> +
>> + /* enable interrupts */
>> + value = IER_UND | IER_OVR | IER_CMD_DONE | IER_ECC_ERR | IER_GIE;
>> + writel(value, ctrl->regs + IER);
>> +
>> + /* reset config */
>> + writel(0, ctrl->regs + CFG);
>> +
>> + err = tegra_nand_chips_init(ctrl->dev, ctrl);
>> + if (err)
>> + goto err_disable_clk;
>> +
>> + platform_set_drvdata(pdev, ctrl);
>> +
>> + return 0;
>> +
>> +err_disable_clk:
>> + clk_disable_unprepare(ctrl->clk);
>> + return err;
>> +}
>> +
>> +static int tegra_nand_remove(struct platform_device *pdev)
>> +{
>> + struct tegra_nand_controller *ctrl = platform_get_drvdata(pdev);
>> +
>> + nand_release(nand_to_mtd(ctrl->chip));
>> +
>> + clk_disable_unprepare(ctrl->clk);
>> +
>> + return 0;
>> +}
>> +
>> +static const struct of_device_id tegra_nand_of_match[] = {
>> + { .compatible = "nvidia,tegra20-nand" },
>> + { /* sentinel */ }
>> +};
>> +
>> +static struct platform_driver tegra_nand_driver = {
>> + .driver = {
>> + .name = "tegra-nand",
>> + .of_match_table = tegra_nand_of_match,
>> + },
>> + .probe = tegra_nand_probe,
>> + .remove = tegra_nand_remove,
>> +};
>> +module_platform_driver(tegra_nand_driver);
>> +
>> +MODULE_DESCRIPTION("NVIDIA Tegra NAND driver");
>> +MODULE_AUTHOR("Thierry Reding <[email protected]>");
>> +MODULE_AUTHOR("Lucas Stach <[email protected]>");
>> +MODULE_AUTHOR("Stefan Agner <[email protected]>");
>> +MODULE_LICENSE("GPL v2");
>> +MODULE_DEVICE_TABLE(of, tegra_nand_of_match);
>>
Note that it's certainly possible to encode U-Boot and kernel with
RS[4] and still use RS[8] for the rootfs even if the boot rom doesn't
support it. This whole 'use-bootable-ecc-only' business seems a bit
overengineered.
2018-05-28 14:43 GMT+02:00 Stefan Agner <[email protected]>:
> On 28.05.2018 13:57, Dmitry Osipenko wrote:
>> On 28.05.2018 00:54, Stefan Agner wrote:
>>> Add support for the NAND flash controller found on NVIDIA
>>> Tegra 2 SoCs. This implementation does not make use of the
>>> command queue feature. Regular operations/data transfers are
>>> done in PIO mode. Page read/writes with hardware ECC make
>>> use of the DMA for data transfer.
>>>
>>> Signed-off-by: Lucas Stach <[email protected]>
>>> Signed-off-by: Stefan Agner <[email protected]>
>>> ---
>>> MAINTAINERS | 7 +
>>> drivers/mtd/nand/raw/Kconfig | 6 +
>>> drivers/mtd/nand/raw/Makefile | 1 +
>>> drivers/mtd/nand/raw/tegra_nand.c | 999 ++++++++++++++++++++++++++++++
>>> 4 files changed, 1013 insertions(+)
>>> create mode 100644 drivers/mtd/nand/raw/tegra_nand.c
>>>
>>> diff --git a/MAINTAINERS b/MAINTAINERS
>>> index 58b9861ccf99..8cbbb7111742 100644
>>> --- a/MAINTAINERS
>>> +++ b/MAINTAINERS
>>> @@ -13844,6 +13844,13 @@ M: Laxman Dewangan <[email protected]>
>>> S: Supported
>>> F: drivers/input/keyboard/tegra-kbc.c
>>>
>>> +TEGRA NAND DRIVER
>>> +M: Stefan Agner <[email protected]>
>>> +M: Lucas Stach <[email protected]>
>>> +S: Maintained
>>> +F: Documentation/devicetree/bindings/mtd/nvidia,tegra20-nand.txt
>>> +F: drivers/mtd/nand/raw/tegra_nand.c
>>> +
>>> TEGRA PWM DRIVER
>>> M: Thierry Reding <[email protected]>
>>> S: Supported
>>> diff --git a/drivers/mtd/nand/raw/Kconfig b/drivers/mtd/nand/raw/Kconfig
>>> index 19a2b283fbbe..012c63c6ab47 100644
>>> --- a/drivers/mtd/nand/raw/Kconfig
>>> +++ b/drivers/mtd/nand/raw/Kconfig
>>> @@ -534,4 +534,10 @@ config MTD_NAND_MTK
>>> Enables support for NAND controller on MTK SoCs.
>>> This controller is found on mt27xx, mt81xx, mt65xx SoCs.
>>>
>>> +config MTD_NAND_TEGRA
>>> + tristate "Support for NAND on NVIDIA Tegra"
>>> + depends on ARCH_TEGRA || COMPILE_TEST
>>> + help
>>> + Enables support for NAND flash on NVIDIA Tegra SoC based boards.
>>> +
>>> endif # MTD_NAND
>>> diff --git a/drivers/mtd/nand/raw/Makefile b/drivers/mtd/nand/raw/Makefile
>>> index 165b7ef9e9a1..d5a5f9832b88 100644
>>> --- a/drivers/mtd/nand/raw/Makefile
>>> +++ b/drivers/mtd/nand/raw/Makefile
>>> @@ -56,6 +56,7 @@ obj-$(CONFIG_MTD_NAND_HISI504) += hisi504_nand.o
>>> obj-$(CONFIG_MTD_NAND_BRCMNAND) += brcmnand/
>>> obj-$(CONFIG_MTD_NAND_QCOM) += qcom_nandc.o
>>> obj-$(CONFIG_MTD_NAND_MTK) += mtk_ecc.o mtk_nand.o
>>> +obj-$(CONFIG_MTD_NAND_TEGRA) += tegra_nand.o
>>>
>>> nand-objs := nand_base.o nand_bbt.o nand_timings.o nand_ids.o
>>> nand-objs += nand_amd.o
>>> diff --git a/drivers/mtd/nand/raw/tegra_nand.c b/drivers/mtd/nand/raw/tegra_nand.c
>>> new file mode 100644
>>> index 000000000000..1a0833d97472
>>> --- /dev/null
>>> +++ b/drivers/mtd/nand/raw/tegra_nand.c
>>> @@ -0,0 +1,999 @@
>>> +// SPDX-License-Identifier: GPL-2.0
>>> +/*
>>> + * Copyright (C) 2018 Stefan Agner <[email protected]>
>>> + * Copyright (C) 2014-2015 Lucas Stach <[email protected]>
>>> + * Copyright (C) 2012 Avionic Design GmbH
>>> + */
>>> +
>>> +#include <linux/clk.h>
>>> +#include <linux/completion.h>
>>> +#include <linux/delay.h>
>>> +#include <linux/dma-mapping.h>
>>> +#include <linux/err.h>
>>> +#include <linux/gpio/consumer.h>
>>> +#include <linux/interrupt.h>
>>> +#include <linux/io.h>
>>> +#include <linux/module.h>
>>> +#include <linux/mtd/partitions.h>
>>> +#include <linux/mtd/rawnand.h>
>>> +#include <linux/of.h>
>>> +#include <linux/platform_device.h>
>>> +#include <linux/reset.h>
>>> +
>>> +#define CMD 0x00
>>> +#define CMD_GO (1 << 31)
>>> +#define CMD_CLE (1 << 30)
>>> +#define CMD_ALE (1 << 29)
>>> +#define CMD_PIO (1 << 28)
>>> +#define CMD_TX (1 << 27)
>>> +#define CMD_RX (1 << 26)
>>> +#define CMD_SEC_CMD (1 << 25)
>>> +#define CMD_AFT_DAT (1 << 24)
>>> +#define CMD_TRANS_SIZE(x) (((x - 1) & 0xf) << 20)
>>> +#define CMD_A_VALID (1 << 19)
>>> +#define CMD_B_VALID (1 << 18)
>>> +#define CMD_RD_STATUS_CHK (1 << 17)
>>> +#define CMD_RBSY_CHK (1 << 16)
>>> +#define CMD_CE(x) (1 << (8 + ((x) & 0x7)))
>>> +#define CMD_CLE_SIZE(x) (((x - 1) & 0x3) << 4)
>>> +#define CMD_ALE_SIZE(x) (((x - 1) & 0xf) << 0)
>>> +
>>> +#define STATUS 0x04
>>> +
>>> +#define ISR 0x08
>>> +#define ISR_CORRFAIL_ERR (1 << 24)
>>> +#define ISR_UND (1 << 7)
>>> +#define ISR_OVR (1 << 6)
>>> +#define ISR_CMD_DONE (1 << 5)
>>> +#define ISR_ECC_ERR (1 << 4)
>>> +
>>> +#define IER 0x0c
>>> +#define IER_ERR_TRIG_VAL(x) (((x) & 0xf) << 16)
>>> +#define IER_UND (1 << 7)
>>> +#define IER_OVR (1 << 6)
>>> +#define IER_CMD_DONE (1 << 5)
>>> +#define IER_ECC_ERR (1 << 4)
>>> +#define IER_GIE (1 << 0)
>>> +
>>> +#define CFG 0x10
>>> +#define CFG_HW_ECC (1 << 31)
>>> +#define CFG_ECC_SEL (1 << 30)
>>> +#define CFG_ERR_COR (1 << 29)
>>> +#define CFG_PIPE_EN (1 << 28)
>>> +#define CFG_TVAL_4 (0 << 24)
>>> +#define CFG_TVAL_6 (1 << 24)
>>> +#define CFG_TVAL_8 (2 << 24)
>>> +#define CFG_SKIP_SPARE (1 << 23)
>>> +#define CFG_BUS_WIDTH_8 (0 << 21)
>>> +#define CFG_BUS_WIDTH_16 (1 << 21)
>>> +#define CFG_COM_BSY (1 << 20)
>>> +#define CFG_PS_256 (0 << 16)
>>> +#define CFG_PS_512 (1 << 16)
>>> +#define CFG_PS_1024 (2 << 16)
>>> +#define CFG_PS_2048 (3 << 16)
>>> +#define CFG_PS_4096 (4 << 16)
>>> +#define CFG_SKIP_SPARE_SIZE_4 (0 << 14)
>>> +#define CFG_SKIP_SPARE_SIZE_8 (1 << 14)
>>> +#define CFG_SKIP_SPARE_SIZE_12 (2 << 14)
>>> +#define CFG_SKIP_SPARE_SIZE_16 (3 << 14)
>>> +#define CFG_TAG_BYTE_SIZE(x) ((x) & 0xff)
>>> +
>>> +#define TIMING_1 0x14
>>> +#define TIMING_TRP_RESP(x) (((x) & 0xf) << 28)
>>> +#define TIMING_TWB(x) (((x) & 0xf) << 24)
>>> +#define TIMING_TCR_TAR_TRR(x) (((x) & 0xf) << 20)
>>> +#define TIMING_TWHR(x) (((x) & 0xf) << 16)
>>> +#define TIMING_TCS(x) (((x) & 0x3) << 14)
>>> +#define TIMING_TWH(x) (((x) & 0x3) << 12)
>>> +#define TIMING_TWP(x) (((x) & 0xf) << 8)
>>> +#define TIMING_TRH(x) (((x) & 0xf) << 4)
>>> +#define TIMING_TRP(x) (((x) & 0xf) << 0)
>>> +
>>> +#define RESP 0x18
>>> +
>>> +#define TIMING_2 0x1c
>>> +#define TIMING_TADL(x) ((x) & 0xf)
>>> +
>>> +#define CMD_1 0x20
>>> +#define CMD_2 0x24
>>> +#define ADDR_1 0x28
>>> +#define ADDR_2 0x2c
>>> +
>>> +#define DMA_CTRL 0x30
>>> +#define DMA_CTRL_GO (1 << 31)
>>> +#define DMA_CTRL_IN (0 << 30)
>>> +#define DMA_CTRL_OUT (1 << 30)
>>> +#define DMA_CTRL_PERF_EN (1 << 29)
>>> +#define DMA_CTRL_IE_DONE (1 << 28)
>>> +#define DMA_CTRL_REUSE (1 << 27)
>>> +#define DMA_CTRL_BURST_1 (2 << 24)
>>> +#define DMA_CTRL_BURST_4 (3 << 24)
>>> +#define DMA_CTRL_BURST_8 (4 << 24)
>>> +#define DMA_CTRL_BURST_16 (5 << 24)
>>> +#define DMA_CTRL_IS_DONE (1 << 20)
>>> +#define DMA_CTRL_EN_A (1 << 2)
>>> +#define DMA_CTRL_EN_B (1 << 1)
>>> +
>>> +#define DMA_CFG_A 0x34
>>> +#define DMA_CFG_B 0x38
>>> +
>>> +#define FIFO_CTRL 0x3c
>>> +#define FIFO_CTRL_CLR_ALL (1 << 3)
>>> +
>>> +#define DATA_PTR 0x40
>>> +#define TAG_PTR 0x44
>>> +#define ECC_PTR 0x48
>>> +
>>> +#define DEC_STATUS 0x4c
>>> +#define DEC_STATUS_A_ECC_FAIL (1 << 1)
>>> +#define DEC_STATUS_ERR_COUNT_MASK 0x00ff0000
>>> +#define DEC_STATUS_ERR_COUNT_SHIFT 16
>>> +
>>> +#define HWSTATUS_CMD 0x50
>>> +#define HWSTATUS_MASK 0x54
>>> +#define HWSTATUS_RDSTATUS_MASK(x) (((x) & 0xff) << 24)
>>> +#define HWSTATUS_RDSTATUS_VALUE(x) (((x) & 0xff) << 16)
>>> +#define HWSTATUS_RBSY_MASK(x) (((x) & 0xff) << 8)
>>> +#define HWSTATUS_RBSY_VALUE(x) (((x) & 0xff) << 0)
>>> +
>>> +#define BCH_CONFIG 0xcc
>>> +#define BCH_ENABLE (1 << 0)
>>> +#define BCH_TVAL_4 (0 << 4)
>>> +#define BCH_TVAL_8 (1 << 4)
>>> +#define BCH_TVAL_14 (2 << 4)
>>> +#define BCH_TVAL_16 (3 << 4)
>>> +
>>> +#define DEC_STAT_RESULT 0xd0
>>> +#define DEC_STAT_BUF 0xd4
>>> +#define DEC_STAT_BUF_FAIL_SEC_FLAG_MASK 0xff000000
>>> +#define DEC_STAT_BUF_FAIL_SEC_FLAG_SHIFT 24
>>> +#define DEC_STAT_BUF_CORR_SEC_FLAG_MASK 0x00ff0000
>>> +#define DEC_STAT_BUF_CORR_SEC_FLAG_SHIFT 16
>>> +#define DEC_STAT_BUF_MAX_CORR_CNT_MASK 0x00001f00
>>> +#define DEC_STAT_BUF_MAX_CORR_CNT_SHIFT 8
>>> +
>>> +#define SKIP_SPARE_BYTES 4
>>> +#define BITS_PER_STEP_RS 18
>>> +#define BITS_PER_STEP_BCH 13
>>> +
>>> +struct tegra_nand_controller {
>>> + struct nand_hw_control controller;
>>> + void __iomem *regs;
>>> + struct clk *clk;
>>> + struct device *dev;
>>> + struct completion command_complete;
>>> + struct completion dma_complete;
>>> + bool last_read_error;
>>> + int cur_chip;
>>> + struct nand_chip *chip;
>>> +};
>>> +
>>> +struct tegra_nand_chip {
>>> + struct nand_chip chip;
>>> + struct gpio_desc *wp_gpio;
>>> +};
>>> +
>>> +static inline struct tegra_nand_controller *to_tegra_ctrl(
>>> + struct nand_hw_control *hw_ctrl)
>>> +{
>>> + return container_of(hw_ctrl, struct tegra_nand_controller, controller);
>>> +}
>>> +
>>> +static int tegra_nand_ooblayout_rs_ecc(struct mtd_info *mtd, int section,
>>> + struct mtd_oob_region *oobregion)
>>> +{
>>> + struct nand_chip *chip = mtd_to_nand(mtd);
>>> + int bytes_per_step = (BITS_PER_STEP_RS * chip->ecc.strength) / 8;
>>> +
>>> + if (section > 0)
>>> + return -ERANGE;
>>> +
>>> + oobregion->offset = SKIP_SPARE_BYTES;
>>> + oobregion->length = round_up(bytes_per_step * chip->ecc.steps, 4);
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +static int tegra_nand_ooblayout_rs_free(struct mtd_info *mtd, int section,
>>> + struct mtd_oob_region *oobregion)
>>> +{
>>> + struct nand_chip *chip = mtd_to_nand(mtd);
>>> + int bytes_per_step = DIV_ROUND_UP(BITS_PER_STEP_RS * chip->ecc.strength, 8);
>>> +
>>> + if (section > 0)
>>> + return -ERANGE;
>>> +
>>> + oobregion->offset = SKIP_SPARE_BYTES +
>>> + round_up(bytes_per_step * chip->ecc.steps, 4);
>>> + oobregion->length = mtd->oobsize - oobregion->offset;
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +static const struct mtd_ooblayout_ops tegra_nand_oob_rs_ops = {
>>> + .ecc = tegra_nand_ooblayout_rs_ecc,
>>> + .free = tegra_nand_ooblayout_rs_free,
>>> +};
>>> +
>>> +static int tegra_nand_ooblayout_bch_ecc(struct mtd_info *mtd, int section,
>>> + struct mtd_oob_region *oobregion)
>>> +{
>>> + struct nand_chip *chip = mtd_to_nand(mtd);
>>> + int bytes_per_step = DIV_ROUND_UP(BITS_PER_STEP_BCH * chip->ecc.strength, 8);
>>> +
>>> + if (section > 0)
>>> + return -ERANGE;
>>> +
>>> + oobregion->offset = SKIP_SPARE_BYTES;
>>> + oobregion->length = round_up(bytes_per_step * chip->ecc.steps, 4);
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +static int tegra_nand_ooblayout_bch_free(struct mtd_info *mtd, int section,
>>> + struct mtd_oob_region *oobregion)
>>> +{
>>> + struct nand_chip *chip = mtd_to_nand(mtd);
>>> + int bytes_per_step = (BITS_PER_STEP_BCH * chip->ecc.strength) / 8;
>>> +
>>> + if (section > 0)
>>> + return -ERANGE;
>>> +
>>> + oobregion->offset = SKIP_SPARE_BYTES +
>>> + round_up(bytes_per_step * chip->ecc.steps, 4);
>>> + oobregion->length = mtd->oobsize - oobregion->offset;
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +/*
>>> + * Layout with tag bytes is
>>> + *
>>> + * --------------------------------------------------------------------------
>>> + * | main area | skip bytes | tag bytes | parity | .. |
>>> + * --------------------------------------------------------------------------
>>> + *
>>> + * If not tag bytes are written, parity moves right after skip bytes!
>>> + */
>>> +static const struct mtd_ooblayout_ops tegra_nand_oob_bch_ops = {
>>> + .ecc = tegra_nand_ooblayout_bch_ecc,
>>> + .free = tegra_nand_ooblayout_bch_free,
>>> +};
>>> +
>>> +static irqreturn_t tegra_nand_irq(int irq, void *data)
>>> +{
>>> + struct tegra_nand_controller *ctrl = data;
>>> + u32 isr, dma;
>>> +
>>> + isr = readl_relaxed(ctrl->regs + ISR);
>>> + dma = readl_relaxed(ctrl->regs + DMA_CTRL);
>>> + dev_dbg(ctrl->dev, "isr %08x\n", isr);
>>> +
>>> + if (!isr && !(dma & DMA_CTRL_IS_DONE))
>>> + return IRQ_NONE;
>>> +
>>> + if (isr & ISR_CORRFAIL_ERR)
>>> + ctrl->last_read_error = true;
>>> +
>>> + if (isr & ISR_CMD_DONE)
>>> + complete(&ctrl->command_complete);
>>> +
>>> + if (isr & ISR_UND)
>>> + dev_dbg(ctrl->dev, "FIFO underrun\n");
>>> +
>>> + if (isr & ISR_OVR)
>>> + dev_dbg(ctrl->dev, "FIFO overrun\n");
>>> +
>>> + /* handle DMA interrupts */
>>> + if (dma & DMA_CTRL_IS_DONE) {
>>> + writel(dma, ctrl->regs + DMA_CTRL);
>>> + complete(&ctrl->dma_complete);
>>> + }
>>> +
>>> + /* clear interrupts */
>>> + writel(isr, ctrl->regs + ISR);
>>> +
>>> + return IRQ_HANDLED;
>>> +}
>>> +
>>> +static int tegra_nand_cmd(struct nand_chip *chip,
>>> + const struct nand_subop *subop)
>>> +{
>>> + const struct nand_op_instr *instr;
>>> + const struct nand_op_instr *instr_data_in = NULL;
>>> + struct tegra_nand_controller *ctrl = to_tegra_ctrl(chip->controller);
>>> + unsigned int op_id = -1, trfr_in_sz = 0, trfr_out_sz = 0, offset = 0;
>>> + bool first_cmd = true;
>>> + u32 cmd = 0;
>>> + u32 value;
>>> +
>>> + for (op_id = 0; op_id < subop->ninstrs; op_id++) {
>>> + unsigned int naddrs, i;
>>> + const u8 *addrs;
>>> + u32 addr1 = 0, addr2 = 0;
>>> +
>>> + instr = &subop->instrs[op_id];
>>> +
>>> + switch (instr->type) {
>>> + case NAND_OP_CMD_INSTR:
>>> + if (first_cmd) {
>>> + cmd |= CMD_CLE;
>>> + writel(instr->ctx.cmd.opcode, ctrl->regs + CMD_1);
>>> + } else {
>>> + cmd |= CMD_SEC_CMD;
>>> + writel(instr->ctx.cmd.opcode, ctrl->regs + CMD_2);
>>> + }
>>> + first_cmd = false;
>>> + break;
>>> + case NAND_OP_ADDR_INSTR:
>>> + offset = nand_subop_get_addr_start_off(subop, op_id);
>>> + naddrs = nand_subop_get_num_addr_cyc(subop, op_id);
>>> + addrs = &instr->ctx.addr.addrs[offset];
>>> +
>>> + cmd |= CMD_ALE | CMD_ALE_SIZE(naddrs);
>>> + for (i = 0; i < min_t(unsigned int, 4, naddrs); i++)
>>> + addr1 |= *addrs++ << (8 * i);
>>> + naddrs -= i;
>>> + for (i = 0; i < min_t(unsigned int, 4, naddrs); i++)
>>> + addr2 |= *addrs++ << (8 * i);
>>> + writel(addr1, ctrl->regs + ADDR_1);
>>> + writel(addr2, ctrl->regs + ADDR_2);
>>> + break;
>>> +
>>> + case NAND_OP_DATA_IN_INSTR:
>>> + trfr_in_sz = nand_subop_get_data_len(subop, op_id);
>>> + offset = nand_subop_get_data_start_off(subop, op_id);
>>> +
>>> + cmd |= CMD_TRANS_SIZE(trfr_in_sz) | CMD_PIO | CMD_RX | CMD_A_VALID;
>>> +
>>> + instr_data_in = instr;
>>> + break;
>>> +
>>> + case NAND_OP_DATA_OUT_INSTR:
>>> + trfr_out_sz = nand_subop_get_data_len(subop, op_id);
>>> + offset = nand_subop_get_data_start_off(subop, op_id);
>>> + trfr_out_sz = min_t(size_t, trfr_out_sz, 4);
>>> +
>>> + cmd |= CMD_TRANS_SIZE(trfr_out_sz) | CMD_PIO | CMD_TX | CMD_A_VALID;
>>> +
>>> + memcpy(&value, instr->ctx.data.buf.out + offset, trfr_out_sz);
>>> + writel(value, ctrl->regs + RESP);
>>> +
>>> + break;
>>> + case NAND_OP_WAITRDY_INSTR:
>>> + cmd |= CMD_RBSY_CHK;
>>> + break;
>>> +
>>> + }
>>> + }
>>> +
>>> +
>>> + cmd |= CMD_GO | CMD_CE(ctrl->cur_chip);
>>> + writel(cmd, ctrl->regs + CMD);
>>> + wait_for_completion(&ctrl->command_complete);
>>
>> Could this and other completions stuck forever? What about
>> wait_for_completion_timeout() + HW reset / re-init on timeout?
>>
>
> They actually get stuck forever when I try to use DMA without HW ECC...
> I haven't seen it with HW ECC.
>
> But yes, _timeout variant makes sense here. Not sure if re-init is
> necessary since we rewrite all the relevant settings.
>
>
>>> +
>>> + if (instr_data_in) {
>>> + u32 value;
>>> + size_t n = min_t(size_t, trfr_in_sz, 4);
>>> +
>>> + value = readl(ctrl->regs + RESP);
>>> + memcpy(instr_data_in->ctx.data.buf.in + offset, &value, n);
>>> + }
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +static const struct nand_op_parser tegra_nand_op_parser = NAND_OP_PARSER(
>>> + NAND_OP_PARSER_PATTERN(tegra_nand_cmd,
>>> + NAND_OP_PARSER_PAT_CMD_ELEM(true),
>>> + NAND_OP_PARSER_PAT_ADDR_ELEM(true, 8),
>>> + NAND_OP_PARSER_PAT_CMD_ELEM(true),
>>> + NAND_OP_PARSER_PAT_WAITRDY_ELEM(true)),
>>> + NAND_OP_PARSER_PATTERN(tegra_nand_cmd,
>>> + NAND_OP_PARSER_PAT_DATA_OUT_ELEM(false, 4)),
>>> + NAND_OP_PARSER_PATTERN(tegra_nand_cmd,
>>> + NAND_OP_PARSER_PAT_CMD_ELEM(true),
>>> + NAND_OP_PARSER_PAT_ADDR_ELEM(true, 8),
>>> + NAND_OP_PARSER_PAT_CMD_ELEM(true),
>>> + NAND_OP_PARSER_PAT_WAITRDY_ELEM(true),
>>> + NAND_OP_PARSER_PAT_DATA_IN_ELEM(true, 4)),
>>> + );
>>> +
>>> +static int tegra_nand_exec_op(struct nand_chip *chip,
>>> + const struct nand_operation *op,
>>> + bool check_only)
>>> +{
>>> + return nand_op_parser_exec_op(chip, &tegra_nand_op_parser, op,
>>> + check_only);
>>> +}
>>> +static void tegra_nand_select_chip(struct mtd_info *mtd, int chip_nr)
>>> +{
>>> + struct nand_chip *chip = mtd_to_nand(mtd);
>>> + struct tegra_nand_controller *ctrl = to_tegra_ctrl(chip->controller);
>>> +
>>> + ctrl->cur_chip = chip_nr;
>>> +}
>>> +
>>> +static u32 tegra_nand_fill_address(struct tegra_nand_controller *ctrl,
>>> + struct nand_chip *chip, int page)
>>> +{
>>> + /* Lower 16-bits are column, always 0 */
>>> + writel(page << 16, ctrl->regs + ADDR_1);
>>> +
>>> + if (chip->options & NAND_ROW_ADDR_3) {
>>> + writel(page >> 16, ctrl->regs + ADDR_2);
>>> + return 5;
>>> + }
>>> +
>>> + return 4;
>>> +}
>>> +
>>> +static void tegra_nand_hw_ecc(struct tegra_nand_controller *ctrl,
>>> + struct nand_chip *chip, bool enable)
>>> +{
>>> + u32 value;
>>> +
>>> + switch (chip->ecc.algo) {
>>> + case NAND_ECC_RS:
>>> + value = readl(ctrl->regs + CFG);
>>> + if (enable)
>>> + value |= CFG_HW_ECC | CFG_ERR_COR;
>>> + else
>>> + value &= ~(CFG_HW_ECC | CFG_ERR_COR);
>>> + writel(value, ctrl->regs + CFG);
>>> + break;
>>> + case NAND_ECC_BCH:
>>> + value = readl(ctrl->regs + BCH_CONFIG);
>>> + if (enable)
>>> + value |= BCH_ENABLE;
>>> + else
>>> + value &= ~BCH_ENABLE;
>>> + writel(value, ctrl->regs + BCH_CONFIG);
>>> + break;
>>> + default:
>>> + dev_err(ctrl->dev, "Unsupported hardware ECC algorithm\n");
>>> + break;
>>> + }
>>> +}
>>> +
>>> +static int tegra_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
>>> + uint8_t *buf, int oob_required, int page)
>>> +{
>>> + struct tegra_nand_controller *ctrl = to_tegra_ctrl(chip->controller);
>>> + dma_addr_t dma_addr;
>>> + u32 value, addrs;
>>> + int ret, dma_len;
>>> +
>>> + writel(NAND_CMD_READ0, ctrl->regs + CMD_1);
>>> + writel(NAND_CMD_READSTART, ctrl->regs + CMD_2);
>>> +
>>> + addrs = tegra_nand_fill_address(ctrl, chip, page);
>>> +
>>> + dma_len = mtd->writesize + (oob_required ? mtd->oobsize : 0);
>>> + dma_addr = dma_map_single(ctrl->dev, buf, dma_len, DMA_FROM_DEVICE);
>>> + ret = dma_mapping_error(ctrl->dev, dma_addr);
>>> + if (ret) {
>>> + dev_err(ctrl->dev, "dma mapping error\n");
>>> + return -EINVAL;
>>> + }
>>> +
>>> + writel(mtd->writesize - 1, ctrl->regs + DMA_CFG_A);
>>> + writel(dma_addr, ctrl->regs + DATA_PTR);
>>> +
>>> + if (oob_required) {
>>> + struct mtd_oob_region oobregion;
>>> + dma_addr_t dma_addr_oob = dma_addr + mtd->writesize;
>>> +
>>> + mtd_ooblayout_free(mtd, 0, &oobregion);
>>> +
>>> + writel(oobregion.length - 1, ctrl->regs + DMA_CFG_B);
>>> + writel(dma_addr_oob + oobregion.offset, ctrl->regs + TAG_PTR);
>>> + } else {
>>> + writel(0, ctrl->regs + DMA_CFG_B);
>>> + writel(0, ctrl->regs + TAG_PTR);
>>> + }
>>> +
>>> + value = DMA_CTRL_GO | DMA_CTRL_IN | DMA_CTRL_PERF_EN |
>>> + DMA_CTRL_REUSE | DMA_CTRL_IE_DONE | DMA_CTRL_IS_DONE |
>>> + DMA_CTRL_BURST_16 | DMA_CTRL_EN_A;
>>> + if (oob_required)
>>> + value |= DMA_CTRL_EN_B;
>>> + writel(value, ctrl->regs + DMA_CTRL);
>>> +
>>> + value = CMD_CLE | CMD_ALE | CMD_ALE_SIZE(addrs) | CMD_SEC_CMD |
>>> + CMD_RBSY_CHK | CMD_GO | CMD_RX | CMD_TRANS_SIZE(9) |
>>> + CMD_A_VALID | CMD_CE(ctrl->cur_chip);
>>> + if (oob_required)
>>> + value |= CMD_B_VALID;
>>> + writel(value, ctrl->regs + CMD);
>>> +
>>> + wait_for_completion(&ctrl->command_complete);
>>> + wait_for_completion(&ctrl->dma_complete);
>>> +
>>> + dma_unmap_single(ctrl->dev, dma_addr, dma_len, DMA_FROM_DEVICE);
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +static int tegra_nand_read_page_hwecc(struct mtd_info *mtd,
>>> + struct nand_chip *chip,
>>> + uint8_t *buf, int oob_required, int page)
>>> +{
>>> + struct tegra_nand_controller *ctrl = to_tegra_ctrl(chip->controller);
>>> + u32 value;
>>> + int ret;
>>> +
>>> + tegra_nand_hw_ecc(ctrl, chip, true);
>>> + ret = tegra_nand_read_page(mtd, chip, buf, oob_required, page);
>>> + tegra_nand_hw_ecc(ctrl, chip, false);
>>> + if (ret)
>>> + return ret;
>>> +
>>> + /* If no correctable or un-correctable errors occured we can return 0 */
>>> + if (!ctrl->last_read_error)
>>> + return 0;
>>> +
>>> + /*
>>> + * Correctable or un-correctable errors did occure. NAND dec status
>>> + * contains information for all ECC selections
>>> + */
>>> + ctrl->last_read_error = false;
>>> + value = readl(ctrl->regs + DEC_STAT_BUF);
>>> +
>>> + if (value & DEC_STAT_BUF_FAIL_SEC_FLAG_MASK) {
>>> + /*
>>> + * The ECC isn't smart enough to figure out if a page is
>>> + * completely erased and flags an error in this case. So we
>>> + * check the read data here to figure out if it's a legitimate
>>> + * error or a false positive.
>>> + */
>>> + int i, ret;
>>> + int flips_threshold = chip->ecc.strength / 2;
>>> + int max_bitflips = 0;
>>> +
>>> + for (i = 0; i < chip->ecc.steps; i++) {
>>> + u8 *data = buf + (chip->ecc.size * i);
>>> +
>>> + ret = nand_check_erased_ecc_chunk(data, chip->ecc.size,
>>> + NULL, 0,
>>> + NULL, 0,
>>> + flips_threshold);
>>> + if (ret < 0)
>>> + mtd->ecc_stats.failed++;
>>> + else
>>> + max_bitflips = max(ret, max_bitflips);
>>> + }
>>> +
>>> + return max_bitflips;
>>> + } else {
>>> + int max_corr_cnt, corr_sec_flag;
>>> +
>>> + corr_sec_flag = (value & DEC_STAT_BUF_CORR_SEC_FLAG_MASK) >>
>>> + DEC_STAT_BUF_CORR_SEC_FLAG_SHIFT;
>>> + max_corr_cnt = (value & DEC_STAT_BUF_MAX_CORR_CNT_MASK) >>
>>> + DEC_STAT_BUF_MAX_CORR_CNT_SHIFT;
>>> +
>>> + /*
>>> + * The value returned in the register is the maximum of
>>> + * bitflips encountered in any of the ECC regions. As there is
>>> + * no way to get the number of bitflips in a specific regions
>>> + * we are not able to deliver correct stats but instead
>>> + * overestimate the number of corrected bitflips by assuming
>>> + * that all regions where errors have been corrected
>>> + * encountered the maximum number of bitflips.
>>> + */
>>> + mtd->ecc_stats.corrected += max_corr_cnt * hweight8(corr_sec_flag);
>>> +
>>> + return max_corr_cnt;
>>> + }
>>> +
>>> +}
>>> +
>>> +static int tegra_nand_write_page(struct mtd_info *mtd, struct nand_chip *chip,
>>> + const uint8_t *buf, int oob_required, int page)
>>> +{
>>> + struct tegra_nand_controller *ctrl = to_tegra_ctrl(chip->controller);
>>> + dma_addr_t dma_addr;
>>> + u32 value, addrs;
>>> + int ret, dma_len;
>>> +
>>> + writel(NAND_CMD_SEQIN, ctrl->regs + CMD_1);
>>> + writel(NAND_CMD_PAGEPROG, ctrl->regs + CMD_2);
>>> +
>>> + addrs = tegra_nand_fill_address(ctrl, chip, page);
>>> +
>>> + dma_len = mtd->writesize + (oob_required ? mtd->oobsize : 0);
>>> + dma_addr = dma_map_single(ctrl->dev, (void *)buf, dma_len, DMA_TO_DEVICE);
>>> + ret = dma_mapping_error(ctrl->dev, dma_addr);
>>> + if (ret) {
>>> + dev_err(ctrl->dev, "dma mapping error\n");
>>> + return -EINVAL;
>>> + }
>>> +
>>> + writel(mtd->writesize - 1, ctrl->regs + DMA_CFG_A);
>>> + writel(dma_addr, ctrl->regs + DATA_PTR);
>>> +
>>> + if (oob_required) {
>>> + struct mtd_oob_region oobregion;
>>> + dma_addr_t dma_addr_oob = dma_addr + mtd->writesize;
>>> +
>>> + mtd_ooblayout_free(mtd, 0, &oobregion);
>>> +
>>> + writel(oobregion.length - 1, ctrl->regs + DMA_CFG_B);
>>> + writel(dma_addr_oob + oobregion.offset, ctrl->regs + TAG_PTR);
>>> + } else {
>>> + writel(0, ctrl->regs + DMA_CFG_B);
>>> + writel(0, ctrl->regs + TAG_PTR);
>>> + }
>>> +
>>> + value = DMA_CTRL_GO | DMA_CTRL_OUT | DMA_CTRL_PERF_EN |
>>> + DMA_CTRL_IE_DONE | DMA_CTRL_IS_DONE |
>>> + DMA_CTRL_BURST_16 | DMA_CTRL_EN_A;
>>> + if (oob_required)
>>> + value |= DMA_CTRL_EN_B;
>>> + writel(value, ctrl->regs + DMA_CTRL);
>>> +
>>> + value = CMD_CLE | CMD_ALE | CMD_ALE_SIZE(addrs) | CMD_SEC_CMD |
>>> + CMD_AFT_DAT | CMD_RBSY_CHK | CMD_GO | CMD_TX | CMD_A_VALID |
>>> + CMD_TRANS_SIZE(9) | CMD_CE(ctrl->cur_chip);
>>> + if (oob_required)
>>> + value |= CMD_B_VALID;
>>> + writel(value, ctrl->regs + CMD);
>>> +
>>> + wait_for_completion(&ctrl->command_complete);
>>> + wait_for_completion(&ctrl->dma_complete);
>>> +
>>> +
>>> + dma_unmap_single(ctrl->dev, dma_addr, dma_len, DMA_TO_DEVICE);
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +static int tegra_nand_write_page_hwecc(struct mtd_info *mtd,
>>> + struct nand_chip *chip,
>>> + const uint8_t *buf, int oob_required,
>>> + int page)
>>> +{
>>> + struct tegra_nand_controller *ctrl = to_tegra_ctrl(chip->controller);
>>> + int ret;
>>> +
>>> + tegra_nand_hw_ecc(ctrl, chip, true);
>>> + ret = tegra_nand_write_page(mtd, chip, buf, oob_required, page);
>>> + tegra_nand_hw_ecc(ctrl, chip, false);
>>> +
>>> + return ret;
>>> +}
>>> +
>>> +static void tegra_nand_setup_timing(struct tegra_nand_controller *ctrl,
>>> + const struct nand_sdr_timings *timings)
>>> +{
>>> + /*
>>> + * The period (and all other timings in this function) is in ps,
>>> + * so need to take care here to avoid integer overflows.
>>> + */
>>> + unsigned int rate = clk_get_rate(ctrl->clk) / 1000000;
>>> + unsigned int period = DIV_ROUND_UP(1000000, rate);
>>> + u32 val, reg = 0;
>>> +
>>> + val = DIV_ROUND_UP(max3(timings->tAR_min, timings->tRR_min,
>>> + timings->tRC_min), period);
>>> + if (val > 2)
>>> + val -= 3;
>>> + reg |= TIMING_TCR_TAR_TRR(val);
>>> +
>>> + val = DIV_ROUND_UP(max(max(timings->tCS_min, timings->tCH_min),
>>> + max(timings->tALS_min, timings->tALH_min)),
>>> + period);
>>> + if (val > 1)
>>> + val -= 2;
>>> + reg |= TIMING_TCS(val);
>>> +
>>> + val = DIV_ROUND_UP(max(timings->tRP_min, timings->tREA_max) + 6000,
>>> + period);
>>> + reg |= TIMING_TRP(val) | TIMING_TRP_RESP(val);
>>> +
>>> + reg |= TIMING_TWB(DIV_ROUND_UP(timings->tWB_max, period));
>>> + reg |= TIMING_TWHR(DIV_ROUND_UP(timings->tWHR_min, period));
>>> + reg |= TIMING_TWH(DIV_ROUND_UP(timings->tWH_min, period));
>>> + reg |= TIMING_TWP(DIV_ROUND_UP(timings->tWP_min, period));
>>> + reg |= TIMING_TRH(DIV_ROUND_UP(timings->tRHW_min, period));
>>> +
>>> + writel(reg, ctrl->regs + TIMING_1);
>>> +
>>> + val = DIV_ROUND_UP(timings->tADL_min, period);
>>> + if (val > 2)
>>> + val -= 3;
>>> + reg = TIMING_TADL(val);
>>> +
>>> + writel(reg, ctrl->regs + TIMING_2);
>>> +}
>>> +
>>> +static int tegra_nand_setup_data_interface(struct mtd_info *mtd, int csline,
>>> + const struct nand_data_interface *conf)
>>> +{
>>> + struct nand_chip *chip = mtd_to_nand(mtd);
>>> + struct tegra_nand_controller *ctrl = to_tegra_ctrl(chip->controller);
>>> + const struct nand_sdr_timings *timings;
>>> +
>>> + timings = nand_get_sdr_timings(conf);
>>> + if (IS_ERR(timings))
>>> + return PTR_ERR(timings);
>>> +
>>> + if (csline == NAND_DATA_IFACE_CHECK_ONLY)
>>> + return 0;
>>> +
>>> + tegra_nand_setup_timing(ctrl, timings);
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +static int tegra_nand_chips_init(struct device *dev,
>>> + struct tegra_nand_controller *ctrl)
>>> +{
>>> + struct device_node *np = dev->of_node;
>>> + struct device_node *np_nand;
>>> + int nchips = of_get_child_count(np);
>>> + struct tegra_nand_chip *nand;
>>> + struct mtd_info *mtd;
>>> + struct nand_chip *chip;
>>> + unsigned long config, bch_config = 0;
>>> + int bits_per_step;
>>> + int err;
>>> +
>>> + if (nchips != 1) {
>>> + dev_err(dev, "currently only one NAND chip supported\n");
>>> + return -EINVAL;
>>> + }
>>> +
>>> + np_nand = of_get_next_child(np, NULL);
>>> +
>>> + nand = devm_kzalloc(dev, sizeof(*nand), GFP_KERNEL);
>>> + if (!nand) {
>>> + dev_err(dev, "could not allocate chip structure\n");
>>> + return -ENOMEM;
>>> + }
>>> +
>>> + nand->wp_gpio = devm_gpiod_get_optional(dev, "wp", GPIOD_OUT_LOW);
>>> +
>>> + if (IS_ERR(nand->wp_gpio)) {
>>> + err = PTR_ERR(nand->wp_gpio);
>>> + dev_err(dev, "failed to request WP GPIO: %d\n", err);
>>> + return err;
>>> + }
>>> +
>>> + chip = &nand->chip;
>>> + chip->controller = &ctrl->controller;
>>> + ctrl->chip = chip;
>>> +
>>> + mtd = nand_to_mtd(chip);
>>> +
>>> + mtd->dev.parent = dev;
>>> + mtd->name = "tegra_nand";
>>> + mtd->owner = THIS_MODULE;
>>> +
>>> + nand_set_flash_node(chip, np_nand);
>>> +
>>> + chip->options = NAND_NO_SUBPAGE_WRITE | NAND_USE_BOUNCE_BUFFER;
>>> + chip->exec_op = tegra_nand_exec_op;
>>> + chip->select_chip = tegra_nand_select_chip;
>>> + chip->setup_data_interface = tegra_nand_setup_data_interface;
>>> +
>>> + err = nand_scan_ident(mtd, 1, NULL);
>>> + if (err)
>>> + return err;
>>> +
>>> + if (chip->bbt_options & NAND_BBT_USE_FLASH)
>>> + chip->bbt_options |= NAND_BBT_NO_OOB;
>>> +
>>> + chip->ecc.mode = NAND_ECC_HW;
>>> + if (!chip->ecc.size)
>>> + chip->ecc.size = 512;
>>> + if (chip->ecc.size != 512)
>>> + return -EINVAL;
>>> +
>>> + chip->ecc.read_page = tegra_nand_read_page_hwecc;
>>> + chip->ecc.write_page = tegra_nand_write_page_hwecc;
>>> + /* Not functional for unknown reason...
>>> + chip->ecc.read_page_raw = tegra_nand_read_page;
>>> + chip->ecc.write_page_raw = tegra_nand_write_page;
>>> + */
>>> + config = readl(ctrl->regs + CFG);
>>> + config |= CFG_PIPE_EN | CFG_SKIP_SPARE | CFG_SKIP_SPARE_SIZE_4;
>>> +
>>> + if (chip->options & NAND_BUSWIDTH_16)
>>> + config |= CFG_BUS_WIDTH_16;
>>> +
>>> + switch (chip->ecc.algo) {
>>> + case NAND_ECC_RS:
>>> + bits_per_step = BITS_PER_STEP_RS * chip->ecc.strength;
>>> + mtd_set_ooblayout(mtd, &tegra_nand_oob_rs_ops);
>>> + switch (chip->ecc.strength) {
>>> + case 4:
>>> + config |= CFG_ECC_SEL | CFG_TVAL_4;
>>> + break;
>>> + case 6:
>>> + config |= CFG_ECC_SEL | CFG_TVAL_6;
>>> + break;
>>> + case 8:
>>> + config |= CFG_ECC_SEL | CFG_TVAL_8;
>>> + break;
>>> + default:
>>> + dev_err(dev, "ECC strength %d not supported\n",
>>> + chip->ecc.strength);
>>> + return -EINVAL;
>>> + }
>>> + break;
>>> + case NAND_ECC_BCH:
>>> + bits_per_step = BITS_PER_STEP_BCH * chip->ecc.strength;
>>> + mtd_set_ooblayout(mtd, &tegra_nand_oob_bch_ops);
>>> + switch (chip->ecc.strength) {
>>> + case 4:
>>> + bch_config = BCH_TVAL_4;
>>> + break;
>>> + case 8:
>>> + bch_config = BCH_TVAL_8;
>>> + break;
>>> + case 14:
>>> + bch_config = BCH_TVAL_14;
>>> + break;
>>> + case 16:
>>> + bch_config = BCH_TVAL_16;
>>> + break;
>>> + default:
>>> + dev_err(dev, "ECC strength %d not supported\n",
>>> + chip->ecc.strength);
>>> + return -EINVAL;
>>> + }
>>> + break;
>>> + default:
>>> + dev_err(dev, "ECC algorithm not supported\n");
>>> + return -EINVAL;
>>> + }
>>> +
>>> + chip->ecc.bytes = DIV_ROUND_UP(bits_per_step, 8);
>>> +
>>> + switch (mtd->writesize) {
>>> + case 256:
>>> + config |= CFG_PS_256;
>>> + break;
>>> + case 512:
>>> + config |= CFG_PS_512;
>>> + break;
>>> + case 1024:
>>> + config |= CFG_PS_1024;
>>> + break;
>>> + case 2048:
>>> + config |= CFG_PS_2048;
>>> + break;
>>> + case 4096:
>>> + config |= CFG_PS_4096;
>>> + break;
>>> + default:
>>> + dev_err(dev, "unhandled writesize %d\n", mtd->writesize);
>>> + return -ENODEV;
>>> + }
>>> +
>>> + writel(config, ctrl->regs + CFG);
>>> + writel(bch_config, ctrl->regs + BCH_CONFIG);
>>> +
>>> + err = nand_scan_tail(mtd);
>>> + if (err)
>>> + return err;
>>> +
>>> + config |= CFG_TAG_BYTE_SIZE(mtd_ooblayout_count_freebytes(mtd) - 1);
>>> + writel(config, ctrl->regs + CFG);
>>> +
>>> + err = mtd_device_register(mtd, NULL, 0);
>>> + if (err)
>>> + return err;
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +static int tegra_nand_probe(struct platform_device *pdev)
>>> +{
>>> + struct reset_control *rst;
>>> + struct tegra_nand_controller *ctrl;
>>> + struct resource *res;
>>> + unsigned long value;
>>> + int irq, err = 0;
>>> +
>>> + ctrl = devm_kzalloc(&pdev->dev, sizeof(*ctrl), GFP_KERNEL);
>>> + if (!ctrl)
>>> + return -ENOMEM;
>>> +
>>> + ctrl->dev = &pdev->dev;
>>> + nand_hw_control_init(&ctrl->controller);
>>> +
>>> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>>> + ctrl->regs = devm_ioremap_resource(&pdev->dev, res);
>>> + if (IS_ERR(ctrl->regs))
>>> + return PTR_ERR(ctrl->regs);
>>> +
>>> + rst = devm_reset_control_get(&pdev->dev, "nand");
>>> + if (IS_ERR(rst))
>>> + return PTR_ERR(rst);
>>> +
>>> + ctrl->clk = devm_clk_get(&pdev->dev, "nand");
>>> + if (IS_ERR(ctrl->clk))
>>> + return PTR_ERR(ctrl->clk);
>>> +
>>> + err = clk_prepare_enable(ctrl->clk);
>>> + if (err)
>>> + return err;
>>> +
>>> + reset_control_reset(rst);
>>
>> Technically reset_control_reset() could fail, so this should be:
>>
>> err = reset_control_reset(rst);
>> if (err)
>> goto err_disable_clk;
>>
>
> Ok.
>
> --
> Stefan
>
>>> +
>>> + value = HWSTATUS_RDSTATUS_MASK(1) | HWSTATUS_RDSTATUS_VALUE(0) |
>>> + HWSTATUS_RBSY_MASK(NAND_STATUS_READY) |
>>> + HWSTATUS_RBSY_VALUE(NAND_STATUS_READY);
>>> + writel(NAND_CMD_STATUS, ctrl->regs + HWSTATUS_CMD);
>>> + writel(value, ctrl->regs + HWSTATUS_MASK);
>>> +
>>> + init_completion(&ctrl->command_complete);
>>> + init_completion(&ctrl->dma_complete);
>>> +
>>> + /* clear interrupts */
>>> + value = readl(ctrl->regs + ISR);
>>> + writel(value, ctrl->regs + ISR);
>>> +
>>> + irq = platform_get_irq(pdev, 0);
>>> + err = devm_request_irq(&pdev->dev, irq, tegra_nand_irq, 0,
>>> + dev_name(&pdev->dev), ctrl);
>>> + if (err)
>>> + goto err_disable_clk;
>>> +
>>> + writel(DMA_CTRL_IS_DONE, ctrl->regs + DMA_CTRL);
>>> +
>>> + /* enable interrupts */
>>> + value = IER_UND | IER_OVR | IER_CMD_DONE | IER_ECC_ERR | IER_GIE;
>>> + writel(value, ctrl->regs + IER);
>>> +
>>> + /* reset config */
>>> + writel(0, ctrl->regs + CFG);
>>> +
>>> + err = tegra_nand_chips_init(ctrl->dev, ctrl);
>>> + if (err)
>>> + goto err_disable_clk;
>>> +
>>> + platform_set_drvdata(pdev, ctrl);
>>> +
>>> + return 0;
>>> +
>>> +err_disable_clk:
>>> + clk_disable_unprepare(ctrl->clk);
>>> + return err;
>>> +}
>>> +
>>> +static int tegra_nand_remove(struct platform_device *pdev)
>>> +{
>>> + struct tegra_nand_controller *ctrl = platform_get_drvdata(pdev);
>>> +
>>> + nand_release(nand_to_mtd(ctrl->chip));
>>> +
>>> + clk_disable_unprepare(ctrl->clk);
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +static const struct of_device_id tegra_nand_of_match[] = {
>>> + { .compatible = "nvidia,tegra20-nand" },
>>> + { /* sentinel */ }
>>> +};
>>> +
>>> +static struct platform_driver tegra_nand_driver = {
>>> + .driver = {
>>> + .name = "tegra-nand",
>>> + .of_match_table = tegra_nand_of_match,
>>> + },
>>> + .probe = tegra_nand_probe,
>>> + .remove = tegra_nand_remove,
>>> +};
>>> +module_platform_driver(tegra_nand_driver);
>>> +
>>> +MODULE_DESCRIPTION("NVIDIA Tegra NAND driver");
>>> +MODULE_AUTHOR("Thierry Reding <[email protected]>");
>>> +MODULE_AUTHOR("Lucas Stach <[email protected]>");
>>> +MODULE_AUTHOR("Stefan Agner <[email protected]>");
>>> +MODULE_LICENSE("GPL v2");
>>> +MODULE_DEVICE_TABLE(of, tegra_nand_of_match);
>>>
On Mon, 28 May 2018 18:41:26 +0200
Benjamin Lindqvist <[email protected]> wrote:
> Note that it's certainly possible to encode U-Boot and kernel with
> RS[4] and still use RS[8] for the rootfs even if the boot rom doesn't
> support it.
Not if you want to read/write from/to the uboot partition from Linux.
Per-partition ECC setup is not supported, so the only solutions we have
right now are:
1/ use the same ECC config as the one use by the bootrom
2/ only access uboot partition in raw mode from Linux (that implies
generating images containing the ECC bytes so that they can be
flashed to the device in raw mode)
3/ never access uboot partitions from Linux (not sure we want that)
> This whole 'use-bootable-ecc-only' business seems a bit
> overengineered.
>
Hm, I don't find it over-engineered.
On 27.05.2018 23:54, Stefan Agner wrote:
> Add support for the NAND flash controller found on NVIDIA
> Tegra 2 SoCs. This implementation does not make use of the
> command queue feature. Regular operations/data transfers are
> done in PIO mode. Page read/writes with hardware ECC make
> use of the DMA for data transfer.
>
> Signed-off-by: Lucas Stach <[email protected]>
> Signed-off-by: Stefan Agner <[email protected]>
> ---
> MAINTAINERS | 7 +
> drivers/mtd/nand/raw/Kconfig | 6 +
> drivers/mtd/nand/raw/Makefile | 1 +
> drivers/mtd/nand/raw/tegra_nand.c | 999 ++++++++++++++++++++++++++++++
> 4 files changed, 1013 insertions(+)
> create mode 100644 drivers/mtd/nand/raw/tegra_nand.c
>
[...]
> +
> + chip->ecc.read_page = tegra_nand_read_page_hwecc;
> + chip->ecc.write_page = tegra_nand_write_page_hwecc;
> + /* Not functional for unknown reason...
> + chip->ecc.read_page_raw = tegra_nand_read_page;
> + chip->ecc.write_page_raw = tegra_nand_write_page;
> + */
I am giving up on these raw read/write_page functions. Using DMA without
HW ECC just seems not to work.
I do not get the CMD_DONE interrupt as I do when using DMA with HW ECC.
I tried with the same settings, just not enabling DMA (HW_ECC not set,
HW_ERR_CORRECTION not set, and also with/without PIPELINE_EN).
A register dump after a successful read with HW ECC looks like this:
[ 196.935199] CMD: 0x66890104
[ 196.938003] STATUS: 0x00000101
[ 196.941049] ISR: 0x00000000
[ 196.943865] CONFIG: 0x0084000b
[ 196.946914] DMA_MST_CTRL: 0x15000004
[ 196.950481] DMA_CFG_A: 0x00000fff
[ 196.954361] DMA_CFG_B: 0x00000000
[ 196.957670] FIFO: 0x0000aa00
Whereas without HW ECC completion times out (using
wait_for_completion_timeout already):
[ 226.128618] tegra-nand 70008000.nand: CMD timeout, last CMD:
0xe6890104
[ 226.135375] CMD: 0xe6890104
[ 226.138201] STATUS: 0x00000100
[ 226.141280] ISR: 0x00000100
[ 226.153372] CONFIG: 0x0084000b
[ 226.156423] DMA_MST_CTRL: 0x95000004
[ 226.159989] DMA_CFG_A: 0x00000fff
[ 226.164084] DMA_CFG_B: 0x00000000
[ 226.167393] FIFO: 0x0000aa00
It looks to me as if the DMA just does not start the data cycle. The
NAND seems to have read the page (RBSY0 is set).
Note that it is never explicitly stated whether DMA without HW ECC is
supported. There is some indication that it should: There are separated
bits to enable HW ECC/DMA, the reference manual states "If HW ECC is
enabled... " and a block diagram shows separate blocks for the ECC
Engine and NAND DMA control.
There is also indication that it does not: The chapter Restrictions
reads: "HW_ERR_CORRECTION = 0/1, doesn’t alter controller hardware
behavior. Software error correction scheme with HW_ERR_CORRECTION = 0,
is deprecated in Tegra 2 Processor."
Note that the default implementations nand_(read|write)_page_raw which
use exec_op do work fine! Unfortunately, the PIO mode only allows 4
bytes in a read cycle, hence raw read/write is slow...
--
Stefan
> + config = readl(ctrl->regs + CFG);
> + config |= CFG_PIPE_EN | CFG_SKIP_SPARE | CFG_SKIP_SPARE_SIZE_4;
> +
> + if (chip->options & NAND_BUSWIDTH_16)
> + config |= CFG_BUS_WIDTH_16;
> +
> + switch (chip->ecc.algo) {
> + case NAND_ECC_RS:
> + bits_per_step = BITS_PER_STEP_RS * chip->ecc.strength;
> + mtd_set_ooblayout(mtd, &tegra_nand_oob_rs_ops);
> + switch (chip->ecc.strength) {
> + case 4:
> + config |= CFG_ECC_SEL | CFG_TVAL_4;
> + break;
> + case 6:
> + config |= CFG_ECC_SEL | CFG_TVAL_6;
> + break;
> + case 8:
> + config |= CFG_ECC_SEL | CFG_TVAL_8;
> + break;
> + default:
> + dev_err(dev, "ECC strength %d not supported\n",
> + chip->ecc.strength);
> + return -EINVAL;
> + }
> + break;
> + case NAND_ECC_BCH:
> + bits_per_step = BITS_PER_STEP_BCH * chip->ecc.strength;
> + mtd_set_ooblayout(mtd, &tegra_nand_oob_bch_ops);
> + switch (chip->ecc.strength) {
> + case 4:
> + bch_config = BCH_TVAL_4;
> + break;
> + case 8:
> + bch_config = BCH_TVAL_8;
> + break;
> + case 14:
> + bch_config = BCH_TVAL_14;
> + break;
> + case 16:
> + bch_config = BCH_TVAL_16;
> + break;
> + default:
> + dev_err(dev, "ECC strength %d not supported\n",
> + chip->ecc.strength);
> + return -EINVAL;
> + }
> + break;
> + default:
> + dev_err(dev, "ECC algorithm not supported\n");
> + return -EINVAL;
> + }
> +
> + chip->ecc.bytes = DIV_ROUND_UP(bits_per_step, 8);
> +
> + switch (mtd->writesize) {
> + case 256:
> + config |= CFG_PS_256;
> + break;
> + case 512:
> + config |= CFG_PS_512;
> + break;
> + case 1024:
> + config |= CFG_PS_1024;
> + break;
> + case 2048:
> + config |= CFG_PS_2048;
> + break;
> + case 4096:
> + config |= CFG_PS_4096;
> + break;
> + default:
> + dev_err(dev, "unhandled writesize %d\n", mtd->writesize);
> + return -ENODEV;
> + }
> +
> + writel(config, ctrl->regs + CFG);
> + writel(bch_config, ctrl->regs + BCH_CONFIG);
> +
> + err = nand_scan_tail(mtd);
> + if (err)
> + return err;
> +
> + config |= CFG_TAG_BYTE_SIZE(mtd_ooblayout_count_freebytes(mtd) - 1);
> + writel(config, ctrl->regs + CFG);
> +
> + err = mtd_device_register(mtd, NULL, 0);
> + if (err)
> + return err;
> +
> + return 0;
> +}
> +
> +static int tegra_nand_probe(struct platform_device *pdev)
> +{
> + struct reset_control *rst;
> + struct tegra_nand_controller *ctrl;
> + struct resource *res;
> + unsigned long value;
> + int irq, err = 0;
> +
> + ctrl = devm_kzalloc(&pdev->dev, sizeof(*ctrl), GFP_KERNEL);
> + if (!ctrl)
> + return -ENOMEM;
> +
> + ctrl->dev = &pdev->dev;
> + nand_hw_control_init(&ctrl->controller);
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + ctrl->regs = devm_ioremap_resource(&pdev->dev, res);
> + if (IS_ERR(ctrl->regs))
> + return PTR_ERR(ctrl->regs);
> +
> + rst = devm_reset_control_get(&pdev->dev, "nand");
> + if (IS_ERR(rst))
> + return PTR_ERR(rst);
> +
> + ctrl->clk = devm_clk_get(&pdev->dev, "nand");
> + if (IS_ERR(ctrl->clk))
> + return PTR_ERR(ctrl->clk);
> +
> + err = clk_prepare_enable(ctrl->clk);
> + if (err)
> + return err;
> +
> + reset_control_reset(rst);
> +
> + value = HWSTATUS_RDSTATUS_MASK(1) | HWSTATUS_RDSTATUS_VALUE(0) |
> + HWSTATUS_RBSY_MASK(NAND_STATUS_READY) |
> + HWSTATUS_RBSY_VALUE(NAND_STATUS_READY);
> + writel(NAND_CMD_STATUS, ctrl->regs + HWSTATUS_CMD);
> + writel(value, ctrl->regs + HWSTATUS_MASK);
> +
> + init_completion(&ctrl->command_complete);
> + init_completion(&ctrl->dma_complete);
> +
> + /* clear interrupts */
> + value = readl(ctrl->regs + ISR);
> + writel(value, ctrl->regs + ISR);
> +
> + irq = platform_get_irq(pdev, 0);
> + err = devm_request_irq(&pdev->dev, irq, tegra_nand_irq, 0,
> + dev_name(&pdev->dev), ctrl);
> + if (err)
> + goto err_disable_clk;
> +
> + writel(DMA_CTRL_IS_DONE, ctrl->regs + DMA_CTRL);
> +
> + /* enable interrupts */
> + value = IER_UND | IER_OVR | IER_CMD_DONE | IER_ECC_ERR | IER_GIE;
> + writel(value, ctrl->regs + IER);
> +
> + /* reset config */
> + writel(0, ctrl->regs + CFG);
> +
> + err = tegra_nand_chips_init(ctrl->dev, ctrl);
> + if (err)
> + goto err_disable_clk;
> +
> + platform_set_drvdata(pdev, ctrl);
> +
> + return 0;
> +
> +err_disable_clk:
> + clk_disable_unprepare(ctrl->clk);
> + return err;
> +}
> +
> +static int tegra_nand_remove(struct platform_device *pdev)
> +{
> + struct tegra_nand_controller *ctrl = platform_get_drvdata(pdev);
> +
> + nand_release(nand_to_mtd(ctrl->chip));
> +
> + clk_disable_unprepare(ctrl->clk);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id tegra_nand_of_match[] = {
> + { .compatible = "nvidia,tegra20-nand" },
> + { /* sentinel */ }
> +};
> +
> +static struct platform_driver tegra_nand_driver = {
> + .driver = {
> + .name = "tegra-nand",
> + .of_match_table = tegra_nand_of_match,
> + },
> + .probe = tegra_nand_probe,
> + .remove = tegra_nand_remove,
> +};
> +module_platform_driver(tegra_nand_driver);
> +
> +MODULE_DESCRIPTION("NVIDIA Tegra NAND driver");
> +MODULE_AUTHOR("Thierry Reding <[email protected]>");
> +MODULE_AUTHOR("Lucas Stach <[email protected]>");
> +MODULE_AUTHOR("Stefan Agner <[email protected]>");
> +MODULE_LICENSE("GPL v2");
> +MODULE_DEVICE_TABLE(of, tegra_nand_of_match);
On 31.05.2018 11:37, Stefan Agner wrote:
> On 27.05.2018 23:54, Stefan Agner wrote:
>> Add support for the NAND flash controller found on NVIDIA
>> Tegra 2 SoCs. This implementation does not make use of the
>> command queue feature. Regular operations/data transfers are
>> done in PIO mode. Page read/writes with hardware ECC make
>> use of the DMA for data transfer.
>>
>> Signed-off-by: Lucas Stach <[email protected]>
>> Signed-off-by: Stefan Agner <[email protected]>
>> ---
>> MAINTAINERS | 7 +
>> drivers/mtd/nand/raw/Kconfig | 6 +
>> drivers/mtd/nand/raw/Makefile | 1 +
>> drivers/mtd/nand/raw/tegra_nand.c | 999 ++++++++++++++++++++++++++++++
>> 4 files changed, 1013 insertions(+)
>> create mode 100644 drivers/mtd/nand/raw/tegra_nand.c
>>
> [...]
>> +
>> + chip->ecc.read_page = tegra_nand_read_page_hwecc;
>> + chip->ecc.write_page = tegra_nand_write_page_hwecc;
>> + /* Not functional for unknown reason...
>> + chip->ecc.read_page_raw = tegra_nand_read_page;
>> + chip->ecc.write_page_raw = tegra_nand_write_page;
>> + */
>
> I am giving up on these raw read/write_page functions. Using DMA without
> HW ECC just seems not to work.
>
> I do not get the CMD_DONE interrupt as I do when using DMA with HW ECC.
> I tried with the same settings, just not enabling DMA (HW_ECC not set,
> HW_ERR_CORRECTION not set, and also with/without PIPELINE_EN).
s/not enabling DMA/not enabling HW ECC/
>
> A register dump after a successful read with HW ECC looks like this:
> [ 196.935199] CMD: 0x66890104
> [ 196.938003] STATUS: 0x00000101
> [ 196.941049] ISR: 0x00000000
> [ 196.943865] CONFIG: 0x0084000b
> [ 196.946914] DMA_MST_CTRL: 0x15000004
> [ 196.950481] DMA_CFG_A: 0x00000fff
> [ 196.954361] DMA_CFG_B: 0x00000000
> [ 196.957670] FIFO: 0x0000aa00
>
> Whereas without HW ECC completion times out (using
> wait_for_completion_timeout already):
> [ 226.128618] tegra-nand 70008000.nand: CMD timeout, last CMD:
> 0xe6890104
> [ 226.135375] CMD: 0xe6890104
> [ 226.138201] STATUS: 0x00000100
> [ 226.141280] ISR: 0x00000100
> [ 226.153372] CONFIG: 0x0084000b
> [ 226.156423] DMA_MST_CTRL: 0x95000004
> [ 226.159989] DMA_CFG_A: 0x00000fff
> [ 226.164084] DMA_CFG_B: 0x00000000
> [ 226.167393] FIFO: 0x0000aa00
>
> It looks to me as if the DMA just does not start the data cycle. The
> NAND seems to have read the page (RBSY0 is set).
>
>
> Note that it is never explicitly stated whether DMA without HW ECC is
> supported. There is some indication that it should: There are separated
> bits to enable HW ECC/DMA, the reference manual states "If HW ECC is
> enabled... " and a block diagram shows separate blocks for the ECC
> Engine and NAND DMA control.
>
> There is also indication that it does not: The chapter Restrictions
> reads: "HW_ERR_CORRECTION = 0/1, doesn’t alter controller hardware
> behavior. Software error correction scheme with HW_ERR_CORRECTION = 0,
> is deprecated in Tegra 2 Processor."
>
> Note that the default implementations nand_(read|write)_page_raw which
> use exec_op do work fine! Unfortunately, the PIO mode only allows 4
> bytes in a read cycle, hence raw read/write is slow...
>
> --
> Stefan
>
>
>> + config = readl(ctrl->regs + CFG);
>> + config |= CFG_PIPE_EN | CFG_SKIP_SPARE | CFG_SKIP_SPARE_SIZE_4;
>> +
>> + if (chip->options & NAND_BUSWIDTH_16)
>> + config |= CFG_BUS_WIDTH_16;
>> +
>> + switch (chip->ecc.algo) {
>> + case NAND_ECC_RS:
>> + bits_per_step = BITS_PER_STEP_RS * chip->ecc.strength;
>> + mtd_set_ooblayout(mtd, &tegra_nand_oob_rs_ops);
>> + switch (chip->ecc.strength) {
>> + case 4:
>> + config |= CFG_ECC_SEL | CFG_TVAL_4;
>> + break;
>> + case 6:
>> + config |= CFG_ECC_SEL | CFG_TVAL_6;
>> + break;
>> + case 8:
>> + config |= CFG_ECC_SEL | CFG_TVAL_8;
>> + break;
>> + default:
>> + dev_err(dev, "ECC strength %d not supported\n",
>> + chip->ecc.strength);
>> + return -EINVAL;
>> + }
>> + break;
>> + case NAND_ECC_BCH:
>> + bits_per_step = BITS_PER_STEP_BCH * chip->ecc.strength;
>> + mtd_set_ooblayout(mtd, &tegra_nand_oob_bch_ops);
>> + switch (chip->ecc.strength) {
>> + case 4:
>> + bch_config = BCH_TVAL_4;
>> + break;
>> + case 8:
>> + bch_config = BCH_TVAL_8;
>> + break;
>> + case 14:
>> + bch_config = BCH_TVAL_14;
>> + break;
>> + case 16:
>> + bch_config = BCH_TVAL_16;
>> + break;
>> + default:
>> + dev_err(dev, "ECC strength %d not supported\n",
>> + chip->ecc.strength);
>> + return -EINVAL;
>> + }
>> + break;
>> + default:
>> + dev_err(dev, "ECC algorithm not supported\n");
>> + return -EINVAL;
>> + }
>> +
>> + chip->ecc.bytes = DIV_ROUND_UP(bits_per_step, 8);
>> +
>> + switch (mtd->writesize) {
>> + case 256:
>> + config |= CFG_PS_256;
>> + break;
>> + case 512:
>> + config |= CFG_PS_512;
>> + break;
>> + case 1024:
>> + config |= CFG_PS_1024;
>> + break;
>> + case 2048:
>> + config |= CFG_PS_2048;
>> + break;
>> + case 4096:
>> + config |= CFG_PS_4096;
>> + break;
>> + default:
>> + dev_err(dev, "unhandled writesize %d\n", mtd->writesize);
>> + return -ENODEV;
>> + }
>> +
>> + writel(config, ctrl->regs + CFG);
>> + writel(bch_config, ctrl->regs + BCH_CONFIG);
>> +
>> + err = nand_scan_tail(mtd);
>> + if (err)
>> + return err;
>> +
>> + config |= CFG_TAG_BYTE_SIZE(mtd_ooblayout_count_freebytes(mtd) - 1);
>> + writel(config, ctrl->regs + CFG);
>> +
>> + err = mtd_device_register(mtd, NULL, 0);
>> + if (err)
>> + return err;
>> +
>> + return 0;
>> +}
>> +
>> +static int tegra_nand_probe(struct platform_device *pdev)
>> +{
>> + struct reset_control *rst;
>> + struct tegra_nand_controller *ctrl;
>> + struct resource *res;
>> + unsigned long value;
>> + int irq, err = 0;
>> +
>> + ctrl = devm_kzalloc(&pdev->dev, sizeof(*ctrl), GFP_KERNEL);
>> + if (!ctrl)
>> + return -ENOMEM;
>> +
>> + ctrl->dev = &pdev->dev;
>> + nand_hw_control_init(&ctrl->controller);
>> +
>> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> + ctrl->regs = devm_ioremap_resource(&pdev->dev, res);
>> + if (IS_ERR(ctrl->regs))
>> + return PTR_ERR(ctrl->regs);
>> +
>> + rst = devm_reset_control_get(&pdev->dev, "nand");
>> + if (IS_ERR(rst))
>> + return PTR_ERR(rst);
>> +
>> + ctrl->clk = devm_clk_get(&pdev->dev, "nand");
>> + if (IS_ERR(ctrl->clk))
>> + return PTR_ERR(ctrl->clk);
>> +
>> + err = clk_prepare_enable(ctrl->clk);
>> + if (err)
>> + return err;
>> +
>> + reset_control_reset(rst);
>> +
>> + value = HWSTATUS_RDSTATUS_MASK(1) | HWSTATUS_RDSTATUS_VALUE(0) |
>> + HWSTATUS_RBSY_MASK(NAND_STATUS_READY) |
>> + HWSTATUS_RBSY_VALUE(NAND_STATUS_READY);
>> + writel(NAND_CMD_STATUS, ctrl->regs + HWSTATUS_CMD);
>> + writel(value, ctrl->regs + HWSTATUS_MASK);
>> +
>> + init_completion(&ctrl->command_complete);
>> + init_completion(&ctrl->dma_complete);
>> +
>> + /* clear interrupts */
>> + value = readl(ctrl->regs + ISR);
>> + writel(value, ctrl->regs + ISR);
>> +
>> + irq = platform_get_irq(pdev, 0);
>> + err = devm_request_irq(&pdev->dev, irq, tegra_nand_irq, 0,
>> + dev_name(&pdev->dev), ctrl);
>> + if (err)
>> + goto err_disable_clk;
>> +
>> + writel(DMA_CTRL_IS_DONE, ctrl->regs + DMA_CTRL);
>> +
>> + /* enable interrupts */
>> + value = IER_UND | IER_OVR | IER_CMD_DONE | IER_ECC_ERR | IER_GIE;
>> + writel(value, ctrl->regs + IER);
>> +
>> + /* reset config */
>> + writel(0, ctrl->regs + CFG);
>> +
>> + err = tegra_nand_chips_init(ctrl->dev, ctrl);
>> + if (err)
>> + goto err_disable_clk;
>> +
>> + platform_set_drvdata(pdev, ctrl);
>> +
>> + return 0;
>> +
>> +err_disable_clk:
>> + clk_disable_unprepare(ctrl->clk);
>> + return err;
>> +}
>> +
>> +static int tegra_nand_remove(struct platform_device *pdev)
>> +{
>> + struct tegra_nand_controller *ctrl = platform_get_drvdata(pdev);
>> +
>> + nand_release(nand_to_mtd(ctrl->chip));
>> +
>> + clk_disable_unprepare(ctrl->clk);
>> +
>> + return 0;
>> +}
>> +
>> +static const struct of_device_id tegra_nand_of_match[] = {
>> + { .compatible = "nvidia,tegra20-nand" },
>> + { /* sentinel */ }
>> +};
>> +
>> +static struct platform_driver tegra_nand_driver = {
>> + .driver = {
>> + .name = "tegra-nand",
>> + .of_match_table = tegra_nand_of_match,
>> + },
>> + .probe = tegra_nand_probe,
>> + .remove = tegra_nand_remove,
>> +};
>> +module_platform_driver(tegra_nand_driver);
>> +
>> +MODULE_DESCRIPTION("NVIDIA Tegra NAND driver");
>> +MODULE_AUTHOR("Thierry Reding <[email protected]>");
>> +MODULE_AUTHOR("Lucas Stach <[email protected]>");
>> +MODULE_AUTHOR("Stefan Agner <[email protected]>");
>> +MODULE_LICENSE("GPL v2");
>> +MODULE_DEVICE_TABLE(of, tegra_nand_of_match);