This is an add-on series to the main SoC Sparx5 series
(Message-ID: <[email protected]>
It adds eMMC support for Sparx5, by adding a driver for the SoC SDHCI
controller, DT configuration and DT binding documentation.
Changes in v3:
- Add dt-bindings for property "microchip,clock-delay"
- Enforce "microchip,clock-delay" valid range in driver
- Removed a noisy pr_debug() in sdhci_sparx5_adma_write_desc()
Changes in v2:
- Changes in driver as per review comments
- Drop debug code
- Drop sysfs code
- use usleep_range()
- use mmc_hostname() in pr_debug()
- Remove deactivated code
- Minor cosmetics
Lars Povlsen (3):
dt-bindings: mmc: Add Sparx5 SDHCI controller bindings
sdhci: sparx5: Add Sparx5 SoC eMMC driver
arm64: dts: sparx5: Add Sparx5 eMMC support
.../mmc/microchip,dw-sparx5-sdhci.yaml | 65 +++++
arch/arm64/boot/dts/microchip/sparx5.dtsi | 24 ++
.../boot/dts/microchip/sparx5_pcb125.dts | 23 ++
.../boot/dts/microchip/sparx5_pcb134_emmc.dts | 23 ++
.../boot/dts/microchip/sparx5_pcb135_emmc.dts | 23 ++
drivers/mmc/host/Kconfig | 13 +
drivers/mmc/host/Makefile | 1 +
drivers/mmc/host/sdhci-of-sparx5.c | 269 ++++++++++++++++++
8 files changed, 441 insertions(+)
create mode 100644 Documentation/devicetree/bindings/mmc/microchip,dw-sparx5-sdhci.yaml
create mode 100644 drivers/mmc/host/sdhci-of-sparx5.c
--
2.27.0
This adds the eMMC driver for the Sparx5 SoC. It is based upon the
designware IP, but requires some extra initialization and quirks.
Signed-off-by: Lars Povlsen <[email protected]>
---
drivers/mmc/host/Kconfig | 13 ++
drivers/mmc/host/Makefile | 1 +
drivers/mmc/host/sdhci-of-sparx5.c | 269 +++++++++++++++++++++++++++++
3 files changed, 283 insertions(+)
create mode 100644 drivers/mmc/host/sdhci-of-sparx5.c
diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index 3b706af35ec31..a3bad4b4ed7ea 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -213,6 +213,19 @@ config MMC_SDHCI_OF_DWCMSHC
If you have a controller with this interface, say Y or M here.
If unsure, say N.
+config MMC_SDHCI_OF_SPARX5
+ tristate "SDHCI OF support for the MCHP Sparx5 SoC"
+ depends on MMC_SDHCI_PLTFM
+ depends on ARCH_SPARX5
+ select MMC_SDHCI_IO_ACCESSORS
+ help
+ This selects the Secure Digital Host Controller Interface (SDHCI)
+ found in the MCHP Sparx5 SoC.
+
+ If you have a Sparx5 SoC with this interface, say Y or M here.
+
+ If unsure, say N.
+
config MMC_SDHCI_CADENCE
tristate "SDHCI support for the Cadence SD/SDIO/eMMC controller"
depends on MMC_SDHCI_PLTFM
diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index 4d5bcb0144a0a..451c25fc2c692 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -94,6 +94,7 @@ obj-$(CONFIG_MMC_SDHCI_OF_AT91) += sdhci-of-at91.o
obj-$(CONFIG_MMC_SDHCI_OF_ESDHC) += sdhci-of-esdhc.o
obj-$(CONFIG_MMC_SDHCI_OF_HLWD) += sdhci-of-hlwd.o
obj-$(CONFIG_MMC_SDHCI_OF_DWCMSHC) += sdhci-of-dwcmshc.o
+obj-$(CONFIG_MMC_SDHCI_OF_SPARX5) += sdhci-of-sparx5.o
obj-$(CONFIG_MMC_SDHCI_BCM_KONA) += sdhci-bcm-kona.o
obj-$(CONFIG_MMC_SDHCI_IPROC) += sdhci-iproc.o
obj-$(CONFIG_MMC_SDHCI_MSM) += sdhci-msm.o
diff --git a/drivers/mmc/host/sdhci-of-sparx5.c b/drivers/mmc/host/sdhci-of-sparx5.c
new file mode 100644
index 0000000000000..972942fed4a68
--- /dev/null
+++ b/drivers/mmc/host/sdhci-of-sparx5.c
@@ -0,0 +1,269 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * drivers/mmc/host/sdhci-of-sparx5.c
+ *
+ * MCHP Sparx5 SoC Secure Digital Host Controller Interface.
+ *
+ * Copyright (c) 2019 Microchip Inc.
+ *
+ * Author: Lars Povlsen <[email protected]>
+ */
+
+#include <linux/sizes.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/of_device.h>
+#include <linux/mfd/syscon.h>
+#include <linux/dma-mapping.h>
+
+#include "sdhci-pltfm.h"
+
+#define CPU_REGS_GENERAL_CTRL (0x22 * 4)
+#define MSHC_DLY_CC_MASK GENMASK(16, 13)
+#define MSHC_DLY_CC_SHIFT 13
+#define MSHC_DLY_CC_MAX 15
+
+#define CPU_REGS_PROC_CTRL (0x2C * 4)
+#define ACP_CACHE_FORCE_ENA BIT(4)
+#define ACP_AWCACHE BIT(3)
+#define ACP_ARCACHE BIT(2)
+#define ACP_CACHE_MASK (ACP_CACHE_FORCE_ENA|ACP_AWCACHE|ACP_ARCACHE)
+
+#define MSHC2_VERSION 0x500 /* Off 0x140, reg 0x0 */
+#define MSHC2_TYPE 0x504 /* Off 0x140, reg 0x1 */
+#define MSHC2_EMMC_CTRL 0x52c /* Off 0x140, reg 0xB */
+#define MSHC2_EMMC_CTRL_EMMC_RST_N BIT(2)
+#define MSHC2_EMMC_CTRL_IS_EMMC BIT(0)
+
+struct sdhci_sparx5_data {
+ struct sdhci_host *host;
+ struct regmap *cpu_ctrl;
+ int delay_clock;
+};
+
+#define BOUNDARY_OK(addr, len) \
+ ((addr | (SZ_128M - 1)) == ((addr + len - 1) | (SZ_128M - 1)))
+
+/*
+ * If DMA addr spans 128MB boundary, we split the DMA transfer into two
+ * so that each DMA transfer doesn't exceed the boundary.
+ */
+static void sdhci_sparx5_adma_write_desc(struct sdhci_host *host, void **desc,
+ dma_addr_t addr, int len,
+ unsigned int cmd)
+{
+ int tmplen, offset;
+
+ if (likely(!len || BOUNDARY_OK(addr, len))) {
+ sdhci_adma_write_desc(host, desc, addr, len, cmd);
+ return;
+ }
+
+ pr_debug("%s: write_desc: splitting dma len %d, offset 0x%0llx\n",
+ mmc_hostname(host->mmc), len, addr);
+
+ offset = addr & (SZ_128M - 1);
+ tmplen = SZ_128M - offset;
+ sdhci_adma_write_desc(host, desc, addr, tmplen, cmd);
+
+ addr += tmplen;
+ len -= tmplen;
+ sdhci_adma_write_desc(host, desc, addr, len, cmd);
+}
+
+static void sparx5_set_cacheable(struct sdhci_host *host, u32 value)
+{
+ struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+ struct sdhci_sparx5_data *sdhci_sparx5 = sdhci_pltfm_priv(pltfm_host);
+
+ pr_debug("%s: Set Cacheable = 0x%x\n", mmc_hostname(host->mmc), value);
+
+ /* Update ACP caching attributes in HW */
+ regmap_update_bits(sdhci_sparx5->cpu_ctrl,
+ CPU_REGS_PROC_CTRL, ACP_CACHE_MASK, value);
+}
+
+static void sparx5_set_delay(struct sdhci_host *host, u8 value)
+{
+ struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+ struct sdhci_sparx5_data *sdhci_sparx5 = sdhci_pltfm_priv(pltfm_host);
+
+ pr_debug("%s: Set DLY_CC = %u\n", mmc_hostname(host->mmc), value);
+
+ /* Update DLY_CC in HW */
+ regmap_update_bits(sdhci_sparx5->cpu_ctrl,
+ CPU_REGS_GENERAL_CTRL,
+ MSHC_DLY_CC_MASK,
+ (value << MSHC_DLY_CC_SHIFT));
+}
+
+static void sdhci_sparx5_set_emmc(struct sdhci_host *host)
+{
+ if (!mmc_card_is_removable(host->mmc)) {
+ u8 value;
+
+ value = sdhci_readb(host, MSHC2_EMMC_CTRL);
+ if (!(value & MSHC2_EMMC_CTRL_IS_EMMC)) {
+ value |= MSHC2_EMMC_CTRL_IS_EMMC;
+ pr_debug("%s: Set EMMC_CTRL: 0x%08x\n",
+ mmc_hostname(host->mmc), value);
+ sdhci_writeb(host, value, MSHC2_EMMC_CTRL);
+ }
+ }
+}
+
+static void sdhci_sparx5_reset_emmc(struct sdhci_host *host)
+{
+ u8 value;
+
+ pr_debug("%s: Toggle EMMC_CTRL.EMMC_RST_N\n", mmc_hostname(host->mmc));
+ value = sdhci_readb(host, MSHC2_EMMC_CTRL) &
+ ~MSHC2_EMMC_CTRL_EMMC_RST_N;
+ sdhci_writeb(host, value, MSHC2_EMMC_CTRL);
+ /* For eMMC, minimum is 1us but give it 10us for good measure */
+ usleep_range(10, 20);
+ sdhci_writeb(host, value | MSHC2_EMMC_CTRL_EMMC_RST_N,
+ MSHC2_EMMC_CTRL);
+ /* For eMMC, minimum is 200us but give it 300us for good measure */
+ usleep_range(300, 400);
+}
+
+static void sdhci_sparx5_reset(struct sdhci_host *host, u8 mask)
+{
+ pr_debug("%s: *** RESET: mask %d\n", mmc_hostname(host->mmc), mask);
+
+ sdhci_reset(host, mask);
+
+ /* Be sure CARD_IS_EMMC stays set */
+ sdhci_sparx5_set_emmc(host);
+}
+
+static const struct sdhci_ops sdhci_sparx5_ops = {
+ .set_clock = sdhci_set_clock,
+ .set_bus_width = sdhci_set_bus_width,
+ .set_uhs_signaling = sdhci_set_uhs_signaling,
+ .get_max_clock = sdhci_pltfm_clk_get_max_clock,
+ .reset = sdhci_sparx5_reset,
+ .adma_write_desc = sdhci_sparx5_adma_write_desc,
+};
+
+static const struct sdhci_pltfm_data sdhci_sparx5_pdata = {
+ .quirks = 0,
+ .quirks2 = SDHCI_QUIRK2_HOST_NO_CMD23 | /* Controller issue */
+ SDHCI_QUIRK2_NO_1_8_V, /* No sdr104, ddr50, etc */
+ .ops = &sdhci_sparx5_ops,
+};
+
+int sdhci_sparx5_probe(struct platform_device *pdev)
+{
+ int ret;
+ const char *syscon = "microchip,sparx5-cpu-syscon";
+ struct sdhci_host *host;
+ struct sdhci_pltfm_host *pltfm_host;
+ struct sdhci_sparx5_data *sdhci_sparx5;
+ struct device_node *np = pdev->dev.of_node;
+ u32 value;
+ u32 extra;
+
+ host = sdhci_pltfm_init(pdev, &sdhci_sparx5_pdata,
+ sizeof(*sdhci_sparx5));
+
+ if (IS_ERR(host))
+ return PTR_ERR(host);
+
+ /*
+ * extra adma table cnt for cross 128M boundary handling.
+ */
+ extra = DIV_ROUND_UP_ULL(dma_get_required_mask(&pdev->dev), SZ_128M);
+ if (extra > SDHCI_MAX_SEGS)
+ extra = SDHCI_MAX_SEGS;
+ host->adma_table_cnt += extra;
+
+ pltfm_host = sdhci_priv(host);
+ sdhci_sparx5 = sdhci_pltfm_priv(pltfm_host);
+ sdhci_sparx5->host = host;
+
+ pltfm_host->clk = devm_clk_get(&pdev->dev, "core");
+ if (IS_ERR(pltfm_host->clk)) {
+ ret = PTR_ERR(pltfm_host->clk);
+ dev_err(&pdev->dev, "failed to get core clk: %d\n", ret);
+ goto free_pltfm;
+ }
+ ret = clk_prepare_enable(pltfm_host->clk);
+ if (ret)
+ goto free_pltfm;
+
+ if (!of_property_read_u32(np, "microchip,clock-delay", &value) &&
+ (value > 0 && value <= MSHC_DLY_CC_MAX))
+ sdhci_sparx5->delay_clock = value;
+
+ sdhci_get_of_property(pdev);
+
+ ret = mmc_of_parse(host->mmc);
+ if (ret)
+ goto err_clk;
+
+ sdhci_sparx5->cpu_ctrl = syscon_regmap_lookup_by_compatible(syscon);
+ if (IS_ERR(sdhci_sparx5->cpu_ctrl)) {
+ dev_err(&pdev->dev, "No CPU syscon regmap !\n");
+ ret = PTR_ERR(sdhci_sparx5->cpu_ctrl);
+ goto err_clk;
+ }
+
+ if (sdhci_sparx5->delay_clock >= 0)
+ sparx5_set_delay(host, sdhci_sparx5->delay_clock);
+
+ if (!mmc_card_is_removable(host->mmc)) {
+ /* Do a HW reset of eMMC card */
+ sdhci_sparx5_reset_emmc(host);
+ /* Update EMMC_CTRL */
+ sdhci_sparx5_set_emmc(host);
+ /* If eMMC, disable SD and SDIO */
+ host->mmc->caps2 |= (MMC_CAP2_NO_SDIO|MMC_CAP2_NO_SD);
+ }
+
+ ret = sdhci_add_host(host);
+ if (ret)
+ dev_err(&pdev->dev, "sdhci_add_host() failed (%d)\n", ret);
+
+ /* Set AXI bus master to use un-cached access (for DMA) */
+ if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA) &&
+ IS_ENABLED(CONFIG_DMA_DECLARE_COHERENT))
+ sparx5_set_cacheable(host, ACP_CACHE_FORCE_ENA);
+
+ pr_debug("%s: SDHC version: 0x%08x\n",
+ mmc_hostname(host->mmc), sdhci_readl(host, MSHC2_VERSION));
+ pr_debug("%s: SDHC type: 0x%08x\n",
+ mmc_hostname(host->mmc), sdhci_readl(host, MSHC2_TYPE));
+
+ return ret;
+
+err_clk:
+ clk_disable_unprepare(pltfm_host->clk);
+free_pltfm:
+ sdhci_pltfm_free(pdev);
+ return ret;
+}
+
+static const struct of_device_id sdhci_sparx5_of_match[] = {
+ { .compatible = "microchip,dw-sparx5-sdhci" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, sdhci_sparx5_of_match);
+
+static struct platform_driver sdhci_sparx5_driver = {
+ .driver = {
+ .name = "sdhci-sparx5",
+ .of_match_table = sdhci_sparx5_of_match,
+ .pm = &sdhci_pltfm_pmops,
+ },
+ .probe = sdhci_sparx5_probe,
+ .remove = sdhci_pltfm_unregister,
+};
+
+module_platform_driver(sdhci_sparx5_driver);
+
+MODULE_DESCRIPTION("Sparx5 SDHCI OF driver");
+MODULE_AUTHOR("Lars Povlsen <[email protected]>");
+MODULE_LICENSE("GPL v2");
--
2.27.0
The Sparx5 SDHCI controller is based on the Designware controller IP.
Signed-off-by: Lars Povlsen <[email protected]>
---
.../mmc/microchip,dw-sparx5-sdhci.yaml | 65 +++++++++++++++++++
1 file changed, 65 insertions(+)
create mode 100644 Documentation/devicetree/bindings/mmc/microchip,dw-sparx5-sdhci.yaml
diff --git a/Documentation/devicetree/bindings/mmc/microchip,dw-sparx5-sdhci.yaml b/Documentation/devicetree/bindings/mmc/microchip,dw-sparx5-sdhci.yaml
new file mode 100644
index 0000000000000..55883290543b9
--- /dev/null
+++ b/Documentation/devicetree/bindings/mmc/microchip,dw-sparx5-sdhci.yaml
@@ -0,0 +1,65 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mmc/microchip,dw-sparx5-sdhci.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Microchip Sparx5 Mobile Storage Host Controller Binding
+
+allOf:
+ - $ref: "mmc-controller.yaml"
+
+maintainers:
+ - Lars Povlsen <[email protected]>
+
+# Everything else is described in the common file
+properties:
+ compatible:
+ const: microchip,dw-sparx5-sdhci
+
+ reg:
+ maxItems: 1
+
+ interrupts:
+ maxItems: 1
+
+ clocks:
+ maxItems: 1
+ description:
+ Handle to "core" clock for the sdhci controller.
+
+ clock-names:
+ items:
+ - const: core
+
+ microchip,clock-delay:
+ description: Delay clock to card to meet setup time requirements.
+ Each step increase by 1.25ns.
+ $ref: "/schemas/types.yaml#/definitions/uint32"
+ minimum: 1
+ maximum: 15
+
+required:
+ - compatible
+ - reg
+ - interrupts
+ - clocks
+ - clock-names
+
+examples:
+ - |
+ #include <dt-bindings/interrupt-controller/arm-gic.h>
+ #include <dt-bindings/clock/microchip,sparx5.h>
+ sdhci0: mmc@600800000 {
+ compatible = "microchip,dw-sparx5-sdhci";
+ reg = <0x00800000 0x1000>;
+ pinctrl-0 = <&emmc_pins>;
+ pinctrl-names = "default";
+ clocks = <&clks CLK_ID_AUX1>;
+ clock-names = "core";
+ assigned-clocks = <&clks CLK_ID_AUX1>;
+ assigned-clock-rates = <800000000>;
+ interrupts = <GIC_SPI 4 IRQ_TYPE_LEVEL_HIGH>;
+ bus-width = <8>;
+ microchip,clock-delay = <10>;
+ };
--
2.27.0
This adds eMMC support to the applicable Sparx5 board configuration
files.
Signed-off-by: Lars Povlsen <[email protected]>
---
arch/arm64/boot/dts/microchip/sparx5.dtsi | 24 +++++++++++++++++++
.../boot/dts/microchip/sparx5_pcb125.dts | 23 ++++++++++++++++++
.../boot/dts/microchip/sparx5_pcb134_emmc.dts | 23 ++++++++++++++++++
.../boot/dts/microchip/sparx5_pcb135_emmc.dts | 23 ++++++++++++++++++
4 files changed, 93 insertions(+)
diff --git a/arch/arm64/boot/dts/microchip/sparx5.dtsi b/arch/arm64/boot/dts/microchip/sparx5.dtsi
index 84bca999420ef..c9dbd1a8b22b6 100644
--- a/arch/arm64/boot/dts/microchip/sparx5.dtsi
+++ b/arch/arm64/boot/dts/microchip/sparx5.dtsi
@@ -5,6 +5,7 @@
#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/interrupt-controller/arm-gic.h>
+#include <dt-bindings/clock/microchip,sparx5.h>
/ {
compatible = "microchip,sparx5";
@@ -162,6 +163,20 @@ timer1: timer@600105000 {
interrupts = <GIC_SPI 6 IRQ_TYPE_LEVEL_HIGH>;
};
+ sdhci0: sdhci@600800000 {
+ compatible = "microchip,dw-sparx5-sdhci";
+ status = "disabled";
+ reg = <0x6 0x00800000 0x1000>;
+ pinctrl-0 = <&emmc_pins>;
+ pinctrl-names = "default";
+ clocks = <&clks CLK_ID_AUX1>;
+ clock-names = "core";
+ assigned-clocks = <&clks CLK_ID_AUX1>;
+ assigned-clock-rates = <800000000>;
+ interrupts = <GIC_SPI 4 IRQ_TYPE_LEVEL_HIGH>;
+ bus-width = <8>;
+ };
+
gpio: pinctrl@6110101e0 {
compatible = "microchip,sparx5-pinctrl";
reg = <0x6 0x110101e0 0x90>, <0x6 0x10508010 0x100>;
@@ -191,6 +206,15 @@ i2c2_pins: i2c2-pins {
pins = "GPIO_28", "GPIO_29";
function = "twi2";
};
+
+ emmc_pins: emmc-pins {
+ pins = "GPIO_34", "GPIO_35", "GPIO_36",
+ "GPIO_37", "GPIO_38", "GPIO_39",
+ "GPIO_40", "GPIO_41", "GPIO_42",
+ "GPIO_43", "GPIO_44", "GPIO_45",
+ "GPIO_46", "GPIO_47";
+ function = "emmc";
+ };
};
i2c0: i2c@600101000 {
diff --git a/arch/arm64/boot/dts/microchip/sparx5_pcb125.dts b/arch/arm64/boot/dts/microchip/sparx5_pcb125.dts
index 91ee5b6cfc37a..573309fe45823 100644
--- a/arch/arm64/boot/dts/microchip/sparx5_pcb125.dts
+++ b/arch/arm64/boot/dts/microchip/sparx5_pcb125.dts
@@ -16,6 +16,29 @@ memory@0 {
};
};
+&gpio {
+ emmc_pins: emmc-pins {
+ /* NB: No "GPIO_35", "GPIO_36", "GPIO_37"
+ * (N/A: CARD_nDETECT, CARD_WP, CARD_LED)
+ */
+ pins = "GPIO_34", "GPIO_38", "GPIO_39",
+ "GPIO_40", "GPIO_41", "GPIO_42",
+ "GPIO_43", "GPIO_44", "GPIO_45",
+ "GPIO_46", "GPIO_47";
+ drive-strength = <3>;
+ function = "emmc";
+ };
+};
+
+&sdhci0 {
+ status = "okay";
+ bus-width = <8>;
+ non-removable;
+ pinctrl-0 = <&emmc_pins>;
+ max-frequency = <8000000>;
+ microchip,clock-delay = <10>;
+};
+
&i2c1 {
status = "okay";
};
diff --git a/arch/arm64/boot/dts/microchip/sparx5_pcb134_emmc.dts b/arch/arm64/boot/dts/microchip/sparx5_pcb134_emmc.dts
index 10081a66961bb..bbb9852c1f151 100644
--- a/arch/arm64/boot/dts/microchip/sparx5_pcb134_emmc.dts
+++ b/arch/arm64/boot/dts/microchip/sparx5_pcb134_emmc.dts
@@ -15,3 +15,26 @@ memory@0 {
reg = <0x00000000 0x00000000 0x10000000>;
};
};
+
+&gpio {
+ emmc_pins: emmc-pins {
+ /* NB: No "GPIO_35", "GPIO_36", "GPIO_37"
+ * (N/A: CARD_nDETECT, CARD_WP, CARD_LED)
+ */
+ pins = "GPIO_34", "GPIO_38", "GPIO_39",
+ "GPIO_40", "GPIO_41", "GPIO_42",
+ "GPIO_43", "GPIO_44", "GPIO_45",
+ "GPIO_46", "GPIO_47";
+ drive-strength = <3>;
+ function = "emmc";
+ };
+};
+
+&sdhci0 {
+ status = "okay";
+ pinctrl-0 = <&emmc_pins>;
+ non-removable;
+ max-frequency = <52000000>;
+ bus-width = <8>;
+ microchip,clock-delay = <10>;
+};
diff --git a/arch/arm64/boot/dts/microchip/sparx5_pcb135_emmc.dts b/arch/arm64/boot/dts/microchip/sparx5_pcb135_emmc.dts
index 741f0e12260e5..f82266fe2ad49 100644
--- a/arch/arm64/boot/dts/microchip/sparx5_pcb135_emmc.dts
+++ b/arch/arm64/boot/dts/microchip/sparx5_pcb135_emmc.dts
@@ -15,3 +15,26 @@ memory@0 {
reg = <0x00000000 0x00000000 0x10000000>;
};
};
+
+&gpio {
+ emmc_pins: emmc-pins {
+ /* NB: No "GPIO_35", "GPIO_36", "GPIO_37"
+ * (N/A: CARD_nDETECT, CARD_WP, CARD_LED)
+ */
+ pins = "GPIO_34", "GPIO_38", "GPIO_39",
+ "GPIO_40", "GPIO_41", "GPIO_42",
+ "GPIO_43", "GPIO_44", "GPIO_45",
+ "GPIO_46", "GPIO_47";
+ drive-strength = <3>;
+ function = "emmc";
+ };
+};
+
+&sdhci0 {
+ status = "okay";
+ pinctrl-0 = <&emmc_pins>;
+ non-removable;
+ max-frequency = <52000000>;
+ bus-width = <8>;
+ microchip,clock-delay = <10>;
+};
--
2.27.0
On 16/06/20 5:00 pm, Lars Povlsen wrote:
> This adds the eMMC driver for the Sparx5 SoC. It is based upon the
> designware IP, but requires some extra initialization and quirks.
>
> Signed-off-by: Lars Povlsen <[email protected]>
> ---
> drivers/mmc/host/Kconfig | 13 ++
> drivers/mmc/host/Makefile | 1 +
> drivers/mmc/host/sdhci-of-sparx5.c | 269 +++++++++++++++++++++++++++++
> 3 files changed, 283 insertions(+)
> create mode 100644 drivers/mmc/host/sdhci-of-sparx5.c
>
> diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
> index 3b706af35ec31..a3bad4b4ed7ea 100644
> --- a/drivers/mmc/host/Kconfig
> +++ b/drivers/mmc/host/Kconfig
> @@ -213,6 +213,19 @@ config MMC_SDHCI_OF_DWCMSHC
> If you have a controller with this interface, say Y or M here.
> If unsure, say N.
>
> +config MMC_SDHCI_OF_SPARX5
> + tristate "SDHCI OF support for the MCHP Sparx5 SoC"
> + depends on MMC_SDHCI_PLTFM
> + depends on ARCH_SPARX5
> + select MMC_SDHCI_IO_ACCESSORS
> + help
> + This selects the Secure Digital Host Controller Interface (SDHCI)
> + found in the MCHP Sparx5 SoC.
> +
> + If you have a Sparx5 SoC with this interface, say Y or M here.
> +
> + If unsure, say N.
> +
> config MMC_SDHCI_CADENCE
> tristate "SDHCI support for the Cadence SD/SDIO/eMMC controller"
> depends on MMC_SDHCI_PLTFM
> diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
> index 4d5bcb0144a0a..451c25fc2c692 100644
> --- a/drivers/mmc/host/Makefile
> +++ b/drivers/mmc/host/Makefile
> @@ -94,6 +94,7 @@ obj-$(CONFIG_MMC_SDHCI_OF_AT91) += sdhci-of-at91.o
> obj-$(CONFIG_MMC_SDHCI_OF_ESDHC) += sdhci-of-esdhc.o
> obj-$(CONFIG_MMC_SDHCI_OF_HLWD) += sdhci-of-hlwd.o
> obj-$(CONFIG_MMC_SDHCI_OF_DWCMSHC) += sdhci-of-dwcmshc.o
> +obj-$(CONFIG_MMC_SDHCI_OF_SPARX5) += sdhci-of-sparx5.o
> obj-$(CONFIG_MMC_SDHCI_BCM_KONA) += sdhci-bcm-kona.o
> obj-$(CONFIG_MMC_SDHCI_IPROC) += sdhci-iproc.o
> obj-$(CONFIG_MMC_SDHCI_MSM) += sdhci-msm.o
> diff --git a/drivers/mmc/host/sdhci-of-sparx5.c b/drivers/mmc/host/sdhci-of-sparx5.c
> new file mode 100644
> index 0000000000000..972942fed4a68
> --- /dev/null
> +++ b/drivers/mmc/host/sdhci-of-sparx5.c
> @@ -0,0 +1,269 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * drivers/mmc/host/sdhci-of-sparx5.c
> + *
> + * MCHP Sparx5 SoC Secure Digital Host Controller Interface.
> + *
> + * Copyright (c) 2019 Microchip Inc.
> + *
> + * Author: Lars Povlsen <[email protected]>
> + */
> +
> +#include <linux/sizes.h>
> +#include <linux/delay.h>
> +#include <linux/module.h>
> +#include <linux/regmap.h>
> +#include <linux/of_device.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/dma-mapping.h>
> +
> +#include "sdhci-pltfm.h"
> +
> +#define CPU_REGS_GENERAL_CTRL (0x22 * 4)
> +#define MSHC_DLY_CC_MASK GENMASK(16, 13)
> +#define MSHC_DLY_CC_SHIFT 13
> +#define MSHC_DLY_CC_MAX 15
> +
> +#define CPU_REGS_PROC_CTRL (0x2C * 4)
> +#define ACP_CACHE_FORCE_ENA BIT(4)
> +#define ACP_AWCACHE BIT(3)
> +#define ACP_ARCACHE BIT(2)
> +#define ACP_CACHE_MASK (ACP_CACHE_FORCE_ENA|ACP_AWCACHE|ACP_ARCACHE)
> +
> +#define MSHC2_VERSION 0x500 /* Off 0x140, reg 0x0 */
> +#define MSHC2_TYPE 0x504 /* Off 0x140, reg 0x1 */
> +#define MSHC2_EMMC_CTRL 0x52c /* Off 0x140, reg 0xB */
> +#define MSHC2_EMMC_CTRL_EMMC_RST_N BIT(2)
> +#define MSHC2_EMMC_CTRL_IS_EMMC BIT(0)
> +
> +struct sdhci_sparx5_data {
> + struct sdhci_host *host;
> + struct regmap *cpu_ctrl;
> + int delay_clock;
> +};
> +
> +#define BOUNDARY_OK(addr, len) \
> + ((addr | (SZ_128M - 1)) == ((addr + len - 1) | (SZ_128M - 1)))
> +
> +/*
> + * If DMA addr spans 128MB boundary, we split the DMA transfer into two
> + * so that each DMA transfer doesn't exceed the boundary.
> + */
> +static void sdhci_sparx5_adma_write_desc(struct sdhci_host *host, void **desc,
> + dma_addr_t addr, int len,
> + unsigned int cmd)
> +{
> + int tmplen, offset;
> +
> + if (likely(!len || BOUNDARY_OK(addr, len))) {
> + sdhci_adma_write_desc(host, desc, addr, len, cmd);
> + return;
> + }
> +
> + pr_debug("%s: write_desc: splitting dma len %d, offset 0x%0llx\n",
> + mmc_hostname(host->mmc), len, addr);
> +
> + offset = addr & (SZ_128M - 1);
> + tmplen = SZ_128M - offset;
> + sdhci_adma_write_desc(host, desc, addr, tmplen, cmd);
> +
> + addr += tmplen;
> + len -= tmplen;
> + sdhci_adma_write_desc(host, desc, addr, len, cmd);
> +}
> +
> +static void sparx5_set_cacheable(struct sdhci_host *host, u32 value)
> +{
> + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> + struct sdhci_sparx5_data *sdhci_sparx5 = sdhci_pltfm_priv(pltfm_host);
> +
> + pr_debug("%s: Set Cacheable = 0x%x\n", mmc_hostname(host->mmc), value);
> +
> + /* Update ACP caching attributes in HW */
> + regmap_update_bits(sdhci_sparx5->cpu_ctrl,
> + CPU_REGS_PROC_CTRL, ACP_CACHE_MASK, value);
> +}
> +
> +static void sparx5_set_delay(struct sdhci_host *host, u8 value)
> +{
> + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> + struct sdhci_sparx5_data *sdhci_sparx5 = sdhci_pltfm_priv(pltfm_host);
> +
> + pr_debug("%s: Set DLY_CC = %u\n", mmc_hostname(host->mmc), value);
> +
> + /* Update DLY_CC in HW */
> + regmap_update_bits(sdhci_sparx5->cpu_ctrl,
> + CPU_REGS_GENERAL_CTRL,
> + MSHC_DLY_CC_MASK,
> + (value << MSHC_DLY_CC_SHIFT));
> +}
> +
> +static void sdhci_sparx5_set_emmc(struct sdhci_host *host)
> +{
> + if (!mmc_card_is_removable(host->mmc)) {
> + u8 value;
> +
> + value = sdhci_readb(host, MSHC2_EMMC_CTRL);
> + if (!(value & MSHC2_EMMC_CTRL_IS_EMMC)) {
> + value |= MSHC2_EMMC_CTRL_IS_EMMC;
> + pr_debug("%s: Set EMMC_CTRL: 0x%08x\n",
> + mmc_hostname(host->mmc), value);
> + sdhci_writeb(host, value, MSHC2_EMMC_CTRL);
> + }
> + }
> +}
> +
> +static void sdhci_sparx5_reset_emmc(struct sdhci_host *host)
> +{
> + u8 value;
> +
> + pr_debug("%s: Toggle EMMC_CTRL.EMMC_RST_N\n", mmc_hostname(host->mmc));
> + value = sdhci_readb(host, MSHC2_EMMC_CTRL) &
> + ~MSHC2_EMMC_CTRL_EMMC_RST_N;
> + sdhci_writeb(host, value, MSHC2_EMMC_CTRL);
> + /* For eMMC, minimum is 1us but give it 10us for good measure */
> + usleep_range(10, 20);
> + sdhci_writeb(host, value | MSHC2_EMMC_CTRL_EMMC_RST_N,
> + MSHC2_EMMC_CTRL);
> + /* For eMMC, minimum is 200us but give it 300us for good measure */
> + usleep_range(300, 400);
> +}
> +
> +static void sdhci_sparx5_reset(struct sdhci_host *host, u8 mask)
> +{
> + pr_debug("%s: *** RESET: mask %d\n", mmc_hostname(host->mmc), mask);
> +
> + sdhci_reset(host, mask);
> +
> + /* Be sure CARD_IS_EMMC stays set */
> + sdhci_sparx5_set_emmc(host);
> +}
> +
> +static const struct sdhci_ops sdhci_sparx5_ops = {
> + .set_clock = sdhci_set_clock,
> + .set_bus_width = sdhci_set_bus_width,
> + .set_uhs_signaling = sdhci_set_uhs_signaling,
> + .get_max_clock = sdhci_pltfm_clk_get_max_clock,
> + .reset = sdhci_sparx5_reset,
> + .adma_write_desc = sdhci_sparx5_adma_write_desc,
> +};
> +
> +static const struct sdhci_pltfm_data sdhci_sparx5_pdata = {
> + .quirks = 0,
> + .quirks2 = SDHCI_QUIRK2_HOST_NO_CMD23 | /* Controller issue */
> + SDHCI_QUIRK2_NO_1_8_V, /* No sdr104, ddr50, etc */
> + .ops = &sdhci_sparx5_ops,
> +};
> +
> +int sdhci_sparx5_probe(struct platform_device *pdev)
> +{
> + int ret;
> + const char *syscon = "microchip,sparx5-cpu-syscon";
> + struct sdhci_host *host;
> + struct sdhci_pltfm_host *pltfm_host;
> + struct sdhci_sparx5_data *sdhci_sparx5;
> + struct device_node *np = pdev->dev.of_node;
> + u32 value;
> + u32 extra;
> +
> + host = sdhci_pltfm_init(pdev, &sdhci_sparx5_pdata,
> + sizeof(*sdhci_sparx5));
> +
> + if (IS_ERR(host))
> + return PTR_ERR(host);
> +
> + /*
> + * extra adma table cnt for cross 128M boundary handling.
> + */
> + extra = DIV_ROUND_UP_ULL(dma_get_required_mask(&pdev->dev), SZ_128M);
> + if (extra > SDHCI_MAX_SEGS)
> + extra = SDHCI_MAX_SEGS;
> + host->adma_table_cnt += extra;
> +
> + pltfm_host = sdhci_priv(host);
> + sdhci_sparx5 = sdhci_pltfm_priv(pltfm_host);
> + sdhci_sparx5->host = host;
> +
> + pltfm_host->clk = devm_clk_get(&pdev->dev, "core");
> + if (IS_ERR(pltfm_host->clk)) {
> + ret = PTR_ERR(pltfm_host->clk);
> + dev_err(&pdev->dev, "failed to get core clk: %d\n", ret);
> + goto free_pltfm;
> + }
> + ret = clk_prepare_enable(pltfm_host->clk);
> + if (ret)
> + goto free_pltfm;
> +
> + if (!of_property_read_u32(np, "microchip,clock-delay", &value) &&
> + (value > 0 && value <= MSHC_DLY_CC_MAX))
> + sdhci_sparx5->delay_clock = value;
> +
> + sdhci_get_of_property(pdev);
> +
> + ret = mmc_of_parse(host->mmc);
> + if (ret)
> + goto err_clk;
> +
> + sdhci_sparx5->cpu_ctrl = syscon_regmap_lookup_by_compatible(syscon);
> + if (IS_ERR(sdhci_sparx5->cpu_ctrl)) {
> + dev_err(&pdev->dev, "No CPU syscon regmap !\n");
> + ret = PTR_ERR(sdhci_sparx5->cpu_ctrl);
> + goto err_clk;
> + }
> +
> + if (sdhci_sparx5->delay_clock >= 0)
> + sparx5_set_delay(host, sdhci_sparx5->delay_clock);
> +
> + if (!mmc_card_is_removable(host->mmc)) {
> + /* Do a HW reset of eMMC card */
> + sdhci_sparx5_reset_emmc(host);
> + /* Update EMMC_CTRL */
> + sdhci_sparx5_set_emmc(host);
> + /* If eMMC, disable SD and SDIO */
> + host->mmc->caps2 |= (MMC_CAP2_NO_SDIO|MMC_CAP2_NO_SD);
> + }
> +
> + ret = sdhci_add_host(host);
> + if (ret)
> + dev_err(&pdev->dev, "sdhci_add_host() failed (%d)\n", ret);
Shouldn't this goto err_clk;
Also, the error message is not really needed if ret == -EPROBE_DEFER
> +
> + /* Set AXI bus master to use un-cached access (for DMA) */
> + if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA) &&
> + IS_ENABLED(CONFIG_DMA_DECLARE_COHERENT))
> + sparx5_set_cacheable(host, ACP_CACHE_FORCE_ENA);
> +
> + pr_debug("%s: SDHC version: 0x%08x\n",
> + mmc_hostname(host->mmc), sdhci_readl(host, MSHC2_VERSION));
> + pr_debug("%s: SDHC type: 0x%08x\n",
> + mmc_hostname(host->mmc), sdhci_readl(host, MSHC2_TYPE));
> +
> + return ret;
> +
> +err_clk:
> + clk_disable_unprepare(pltfm_host->clk);
> +free_pltfm:
> + sdhci_pltfm_free(pdev);
> + return ret;
> +}
> +
> +static const struct of_device_id sdhci_sparx5_of_match[] = {
> + { .compatible = "microchip,dw-sparx5-sdhci" },
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, sdhci_sparx5_of_match);
> +
> +static struct platform_driver sdhci_sparx5_driver = {
> + .driver = {
> + .name = "sdhci-sparx5",
> + .of_match_table = sdhci_sparx5_of_match,
> + .pm = &sdhci_pltfm_pmops,
> + },
> + .probe = sdhci_sparx5_probe,
> + .remove = sdhci_pltfm_unregister,
> +};
> +
> +module_platform_driver(sdhci_sparx5_driver);
> +
> +MODULE_DESCRIPTION("Sparx5 SDHCI OF driver");
> +MODULE_AUTHOR("Lars Povlsen <[email protected]>");
> +MODULE_LICENSE("GPL v2");
>
On Tue, 16 Jun 2020 16:00:25 +0200, Lars Povlsen wrote:
> The Sparx5 SDHCI controller is based on the Designware controller IP.
>
> Signed-off-by: Lars Povlsen <[email protected]>
> ---
> .../mmc/microchip,dw-sparx5-sdhci.yaml | 65 +++++++++++++++++++
> 1 file changed, 65 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/mmc/microchip,dw-sparx5-sdhci.yaml
>
My bot found errors running 'make dt_binding_check' on your patch:
Documentation/devicetree/bindings/mmc/microchip,dw-sparx5-sdhci.example.dts:20:18: fatal error: dt-bindings/clock/microchip,sparx5.h: No such file or directory
#include <dt-bindings/clock/microchip,sparx5.h>
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
scripts/Makefile.lib:315: recipe for target 'Documentation/devicetree/bindings/mmc/microchip,dw-sparx5-sdhci.example.dt.yaml' failed
make[1]: *** [Documentation/devicetree/bindings/mmc/microchip,dw-sparx5-sdhci.example.dt.yaml] Error 1
make[1]: *** Waiting for unfinished jobs....
Makefile:1347: recipe for target 'dt_binding_check' failed
make: *** [dt_binding_check] Error 2
See https://patchwork.ozlabs.org/patch/1310435
If you already ran 'make dt_binding_check' and didn't see the above
error(s), then make sure dt-schema is up to date:
pip3 install git+https://github.com/devicetree-org/dt-schema.git@master --upgrade
Please check and re-submit.