Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753206AbdHKLlK (ORCPT ); Fri, 11 Aug 2017 07:41:10 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:56118 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752406AbdHKLlF (ORCPT ); Fri, 11 Aug 2017 07:41:05 -0400 DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org ED76960311 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=absahu@codeaurora.org From: Abhishek Sahu To: boris.brezillon@free-electrons.com Cc: dwmw2@infradead.org, computersforpeace@gmail.com, marek.vasut@gmail.com, richard@nod.at, cyrille.pitchen@wedev4u.fr, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mtd@lists.infradead.org, devicetree@vger.kernel.org, andy.gross@linaro.org, architt@codeaurora.org, sricharan@codeaurora.org, Abhishek Sahu Subject: [PATCH v4 15/20] mtd: nand: qcom: support for command descriptor formation Date: Fri, 11 Aug 2017 17:09:30 +0530 Message-Id: <1502451575-15712-16-git-send-email-absahu@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1502451575-15712-1-git-send-email-absahu@codeaurora.org> References: <1502451575-15712-1-git-send-email-absahu@codeaurora.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 6499 Lines: 198 1. Add the function for command descriptor preparation which will be used only by BAM DMA and it will form the DMA descriptors containing command elements 2. DMA_PREP_CMD flag should be used for forming command DMA descriptors Signed-off-by: Abhishek Sahu --- drivers/mtd/nand/qcom_nandc.c | 108 +++++++++++++++++++++++++++++++++++------- 1 file changed, 92 insertions(+), 16 deletions(-) diff --git a/drivers/mtd/nand/qcom_nandc.c b/drivers/mtd/nand/qcom_nandc.c index d17c466..f2cb696 100644 --- a/drivers/mtd/nand/qcom_nandc.c +++ b/drivers/mtd/nand/qcom_nandc.c @@ -194,6 +194,14 @@ ((size) << READ_LOCATION_SIZE) | \ ((is_last) << READ_LOCATION_LAST)) +/* Returns the NAND register physical address */ +#define nandc_reg_phys(chip, offset) ((chip)->base_phys + (offset)) + +/* Returns the dma address for reg read buffer */ +#define reg_buf_dma_addr(chip, vaddr) \ + ((chip)->reg_read_dma + \ + ((uint8_t *)(vaddr) - (uint8_t *)(chip)->reg_read_buf)) + /* Returns the actual register address for NAND_FLASH_DEV_* */ #define nandc_dev_addr(nandc, reg) ((nandc)->props->flash_dev_offset + (reg)) @@ -311,7 +319,8 @@ struct nandc_regs { * controller * @dev: parent device * @base: MMIO base - * @base_dma: physical base address of controller registers + * @base_phys: physical base address of controller registers + * @base_dma: dma base address of controller registers * @core_clk: controller clock * @aon_clk: another controller clock * @@ -344,6 +353,7 @@ struct qcom_nand_controller { struct device *dev; void __iomem *base; + phys_addr_t base_phys; dma_addr_t base_dma; struct clk *core_clk; @@ -745,6 +755,66 @@ static int prepare_bam_async_desc(struct qcom_nand_controller *nandc, } /* + * Prepares the command descriptor for BAM DMA which will be used for NAND + * register reads and writes. The command descriptor requires the command + * to be formed in command element type so this function uses the command + * element from bam transaction ce array and fills the same with required + * data. A single SGL can contain multiple command elements so + * NAND_BAM_NEXT_SGL will be used for starting the separate SGL + * after the current command element. + */ +static int prep_bam_dma_desc_cmd(struct qcom_nand_controller *nandc, bool read, + int reg_off, const void *vaddr, + int size, unsigned int flags) +{ + int bam_ce_size; + int i, ret; + struct bam_cmd_element *bam_ce_buffer; + struct bam_transaction *bam_txn = nandc->bam_txn; + + bam_ce_buffer = &bam_txn->bam_ce[bam_txn->bam_ce_pos]; + + /* fill the command desc */ + for (i = 0; i < size; i++) { + if (read) + bam_prep_ce(&bam_ce_buffer[i], + nandc_reg_phys(nandc, reg_off + 4 * i), + BAM_READ_COMMAND, + reg_buf_dma_addr(nandc, + (__le32 *)vaddr + i)); + else + bam_prep_ce_le32(&bam_ce_buffer[i], + nandc_reg_phys(nandc, reg_off + 4 * i), + BAM_WRITE_COMMAND, + *((__le32 *)vaddr + i)); + } + + bam_txn->bam_ce_pos += size; + + /* use the separate sgl after this command */ + if (flags & NAND_BAM_NEXT_SGL) { + bam_ce_buffer = &bam_txn->bam_ce[bam_txn->bam_ce_start]; + bam_ce_size = (bam_txn->bam_ce_pos - + bam_txn->bam_ce_start) * + sizeof(struct bam_cmd_element); + sg_set_buf(&bam_txn->cmd_sgl[bam_txn->cmd_sgl_pos], + bam_ce_buffer, bam_ce_size); + bam_txn->cmd_sgl_pos++; + bam_txn->bam_ce_start = bam_txn->bam_ce_pos; + + if (flags & NAND_BAM_NWD) { + ret = prepare_bam_async_desc(nandc, nandc->cmd_chan, + DMA_PREP_FENCE | + DMA_PREP_CMD); + if (ret) + return ret; + } + } + + return 0; +} + +/* * Prepares the data descriptor for BAM DMA which will be used for NAND * data reads and writes. */ @@ -861,19 +931,22 @@ static int read_reg_dma(struct qcom_nand_controller *nandc, int first, { bool flow_control = false; void *vaddr; - int size; - if (first == NAND_READ_ID || first == NAND_FLASH_STATUS) - flow_control = true; + vaddr = nandc->reg_read_buf + nandc->reg_read_pos; + nandc->reg_read_pos += num_regs; if (first == NAND_DEV_CMD_VLD || first == NAND_DEV_CMD1) first = nandc_dev_addr(nandc, first); - size = num_regs * sizeof(u32); - vaddr = nandc->reg_read_buf + nandc->reg_read_pos; - nandc->reg_read_pos += num_regs; + if (nandc->props->is_bam) + return prep_bam_dma_desc_cmd(nandc, true, first, vaddr, + num_regs, flags); - return prep_adm_dma_desc(nandc, true, first, vaddr, size, flow_control); + if (first == NAND_READ_ID || first == NAND_FLASH_STATUS) + flow_control = true; + + return prep_adm_dma_desc(nandc, true, first, vaddr, + num_regs * sizeof(u32), flow_control); } /* @@ -889,13 +962,9 @@ static int write_reg_dma(struct qcom_nand_controller *nandc, int first, bool flow_control = false; struct nandc_regs *regs = nandc->regs; void *vaddr; - int size; vaddr = offset_to_nandc_reg(regs, first); - if (first == NAND_FLASH_CMD) - flow_control = true; - if (first == NAND_ERASED_CW_DETECT_CFG) { if (flags & NAND_ERASED_CW_SET) vaddr = ®s->erased_cw_detect_cfg_set; @@ -912,10 +981,15 @@ static int write_reg_dma(struct qcom_nand_controller *nandc, int first, if (first == NAND_DEV_CMD_VLD_RESTORE || first == NAND_DEV_CMD_VLD) first = nandc_dev_addr(nandc, NAND_DEV_CMD_VLD); - size = num_regs * sizeof(u32); + if (nandc->props->is_bam) + return prep_bam_dma_desc_cmd(nandc, false, first, vaddr, + num_regs, flags); + + if (first == NAND_FLASH_CMD) + flow_control = true; - return prep_adm_dma_desc(nandc, false, first, vaddr, size, - flow_control); + return prep_adm_dma_desc(nandc, false, first, vaddr, + num_regs * sizeof(u32), flow_control); } /* @@ -1177,7 +1251,8 @@ static int submit_descs(struct qcom_nand_controller *nandc) } if (bam_txn->cmd_sgl_pos > bam_txn->cmd_sgl_start) { - r = prepare_bam_async_desc(nandc, nandc->cmd_chan, 0); + r = prepare_bam_async_desc(nandc, nandc->cmd_chan, + DMA_PREP_CMD); if (r) return r; } @@ -2713,6 +2788,7 @@ static int qcom_nandc_probe(struct platform_device *pdev) if (IS_ERR(nandc->base)) return PTR_ERR(nandc->base); + nandc->base_phys = res->start; nandc->base_dma = phys_to_dma(dev, (phys_addr_t)res->start); nandc->core_clk = devm_clk_get(dev, "core"); -- QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation