RE: [PATCH v5 9/9] mmc: dw_mmc: add support for exynos specific implementation of dw-mshc

[Seungwon Jeon <tgih.jun@samsung.com>]

On Wednesday, September 05, 2012, Thomas Abraham <thomas.abraham@linaro.org> wrote:
Version 6 is right?

> Samsung Exynos SoC's extend the dw-mshc controller for additional clock and bus
> control. Add support for these extensions and include provide device tree based
> discovery suppory as well.
> 
> Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
> Acked-by: Will Newton <will.newton@imgtec.com>
> ---
>  .../devicetree/bindings/mmc/exynos-dw-mshc.txt     |   86 +++++++
>  drivers/mmc/host/Kconfig                           |    9 +
>  drivers/mmc/host/Makefile                          |    1 +
>  drivers/mmc/host/dw_mmc-exynos.c                   |  253 ++++++++++++++++++++
>  4 files changed, 349 insertions(+), 0 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/mmc/exynos-dw-mshc.txt
>  create mode 100644 drivers/mmc/host/dw_mmc-exynos.c
> 
> diff --git a/Documentation/devicetree/bindings/mmc/exynos-dw-mshc.txt
> b/Documentation/devicetree/bindings/mmc/exynos-dw-mshc.txt
> new file mode 100644
> index 0000000..323a891
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mmc/exynos-dw-mshc.txt
> @@ -0,0 +1,86 @@
> +* Samsung Exynos specific extensions to the Synopsis Designware Mobile
> +  Storage Host Controller
> +
> +The Synopsis designware mobile storage host controller is used to interface
> +a SoC with storage medium such as eMMC or SD/MMC cards. This file documents
> +differences between the core Synopsis dw mshc controller properties described
> +by synposis-dw-mshc.txt and the properties used by the Samsung Exynos specific
> +extensions to the Synopsis Designware Mobile Storage Host Controller.
> +
> +Required Properties:
> +
> +* compatible: should be
> +	- "samsung,exynos4210-dw-mshc": for controllers with Samsung Exynos4210
> +	  specific extentions.
> +	- "samsung,exynos4412-dw-mshc": for controllers with Samsung Exynos4412
> +	  specific extentions.
> +	- "samsung,exynos5250-dw-mshc": for controllers with Samsung Exynos5250
> +	  specific extentions.
> +
> +* samsung,dw-mshc-ciu-div: Specifies the divider value for the card interface
> +  unit (ciu) clock. This property is applicable only for Exynos5 SoC's and
> +  ignored for Exynos4 SoC's. The valid range of divider value is 0 to 7.
> +
> +* samsung,dw-mshc-sdr-timing: Specifies the value of CIU clock phase shift value
> +  in transmit mode and CIU clock phase shift value in receive mode for single
> +  data rate mode operation. Refer notes below for the order of the cells and the
> +  valid values.
> +
> +* samsung,dw-mshc-ddr-timing: Specifies the value of CUI clock phase shift value
> +  in transmit mode and CIU clock phase shift value in receive mode for double
> +  data rate mode operation. Refer notes below for the order of the cells and the
> +  valid values.
> +
> +  Notes for the sdr-timing and ddr-timing values:
> +
> +    The order of the cells should be
> +      - First Cell: CIU clock phase shift value for tx mode.
> +      - Second Cell: CIU clock phase shift value for rx mode.
> +
> +    Valid values for SDR and DDR CIU clock timing for Exynos5250:
> +      - valid value for tx phase shift and rx phase shift is 0 to 7.
> +      - when CIU clock divider value is set to 3, all possible 8 phase shift
> +        values can be used.
> +      - if CIU clock divider value is 0 (that is divide by 1), both tx and rx
> +        phase shift clocks should be 0.
> +
> +Required properties for a slot:
> +
> +* gpios: specifies a list of gpios used for command, clock and data bus. The
> +  first gpio is the command line and the second gpio is the clock line. The
> +  rest of the gpios (depending on the bus-width property) are the data lines in
> +  no particular order. The format of the gpio specifier depends on the gpio
> +  controller.
> +
> +Example:
> +
> +  The MSHC controller node can be split into two portions, SoC specific and
> +  board specific portions as listed below.
> +
> +	dwmmc0@12200000 {
> +		compatible = "samsung,exynos5250-dw-mshc";
> +		reg = <0x12200000 0x1000>;
> +		interrupts = <0 75 0>;
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +	};
> +
> +	dwmmc0@12200000 {
> +		num-slots = <1>;
> +		supports-highspeed;
> +		broken-cd;
> +		fifo-depth = <0x80>;
> +		card-detect-delay = <200>;
> +		samsung,dw-mshc-sdr-timing = <2 3 3>;
> +		samsung,dw-mshc-ddr-timing = <1 2 3>;
Third filed is still useful?


> +
> +		slot@0 {
> +			reg = <0>;
> +			bus-width = <8>;
> +			gpios = <&gpc0 0 2 0 3>, <&gpc0 1 2 0 3>,
> +				<&gpc1 0 2 3 3>, <&gpc1 1 2 3 3>,
> +				<&gpc1 2 2 3 3>, <&gpc1 3 2 3 3>,
> +				<&gpc0 3 2 3 3>, <&gpc0 4 2 3 3>,
> +				<&gpc0 5 2 3 3>, <&gpc0 6 2 3 3>;
> +		};
> +	};
> diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
> index aa131b3..9bf10e7 100644
> --- a/drivers/mmc/host/Kconfig
> +++ b/drivers/mmc/host/Kconfig
> @@ -540,6 +540,15 @@ config MMC_DW_PLTFM
> 
>  	  If unsure, say Y.
> 
> +config MMC_DW_EXYNOS
> +	tristate "Exynos specific extentions for Synopsys DW Memory Card Interface"
> +	depends on MMC_DW
> +	select MMC_DW_PLTFM
> +	help
> +	  This selects support for Samsung Exynos SoC specific extensions to the
> +	  Synopsys DesignWare Memory Card Interface driver. Select this option
> +	  for platforms based on Exynos4 and Exynos5 SoC's.
> +
>  config MMC_DW_PCI
>  	tristate "Synopsys Designware MCI support on PCI bus"
>  	depends on MMC_DW && PCI
> diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
> index 8922b06..17ad0a7 100644
> --- a/drivers/mmc/host/Makefile
> +++ b/drivers/mmc/host/Makefile
> @@ -39,6 +39,7 @@ obj-$(CONFIG_MMC_VIA_SDMMC)	+= via-sdmmc.o
>  obj-$(CONFIG_SDH_BFIN)		+= bfin_sdh.o
>  obj-$(CONFIG_MMC_DW)		+= dw_mmc.o
>  obj-$(CONFIG_MMC_DW_PLTFM)	+= dw_mmc-pltfm.o
> +obj-$(CONFIG_MMC_DW_EXYNOS)	+= dw_mmc-exynos.o
>  obj-$(CONFIG_MMC_DW_PCI)	+= dw_mmc-pci.o
>  obj-$(CONFIG_MMC_SH_MMCIF)	+= sh_mmcif.o
>  obj-$(CONFIG_MMC_JZ4740)	+= jz4740_mmc.o
> diff --git a/drivers/mmc/host/dw_mmc-exynos.c b/drivers/mmc/host/dw_mmc-exynos.c
> new file mode 100644
> index 0000000..313f364
> --- /dev/null
> +++ b/drivers/mmc/host/dw_mmc-exynos.c
> @@ -0,0 +1,253 @@
> +/*
> + * Exynos Specific Extensions for Synopsys DW Multimedia Card Interface driver
> + *
> + * Copyright (C) 2012, Samsung Electronics Co., Ltd.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + */
> +
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/clk.h>
> +#include <linux/mmc/host.h>
> +#include <linux/mmc/dw_mmc.h>
> +#include <linux/of.h>
> +#include <linux/of_gpio.h>
> +
> +#include "dw_mmc.h"
> +#include "dw_mmc-pltfm.h"
> +
> +#define NUM_PINS(x)			(x + 2)
> +
> +#define SDMMC_CLKSEL			0x09C
> +#define SDMMC_CLKSEL_CCLK_SAMPLE(x)	(((x) & 7) << 0)
> +#define SDMMC_CLKSEL_CCLK_DRIVE(x)	(((x) & 7) << 16)
> +#define SDMMC_CLKSEL_CCLK_DIVIDER(x)	(((x) & 7) << 24)
> +#define SDMMC_CLKSEL_GET_DRV_WD3(x)	(((x) >> 16) & 0x7)
> +#define SDMMC_CLKSEL_TIMING(x, y, z)	(SDMMC_CLKSEL_CCLK_SAMPLE(x) |	\
> +					SDMMC_CLKSEL_CCLK_DRIVE(y) |	\
> +					SDMMC_CLKSEL_CCLK_DIVIDER(z))
> +
> +#define SDMMC_CMD_USE_HOLD_REG		BIT(29)
> +
> +#define EXYNOS4210_FIXED_CIU_CLK_DIV	2
> +#define EXYNOS4412_FIXED_CIU_CLK_DIV	4
> +
> +/* Variations in Exynos specific dw-mshc controller */
> +enum dw_mci_exynos_type {
> +	DW_MCI_TYPE_EXYNOS4210,
> +	DW_MCI_TYPE_EXYNOS4412,
> +	DW_MCI_TYPE_EXYNOS5250,
> +};
> +
> +/* Exynos implementation specific driver private data */
> +struct dw_mci_exynos_priv_data {
> +	enum dw_mci_exynos_type		ctrl_type;
> +	u8				ciu_div;
> +	u32				sdr_timing;
> +	u32				ddr_timing;
> +};
> +
> +static struct dw_mci_exynos_compatible {
> +	char				*compatible;
> +	enum dw_mci_exynos_type		ctrl_type;
> +} exynos_compat[] = {
> +	{
> +		.compatible	= "samsung,exynos4210-dw-mshc",
> +		.ctrl_type	= DW_MCI_TYPE_EXYNOS4210,
> +	}, {
> +		.compatible	= "samsung,exynos4412-dw-mshc",
> +		.ctrl_type	= DW_MCI_TYPE_EXYNOS4412,
> +	}, {
> +		.compatible	= "samsung,exynos5250-dw-mshc",
> +		.ctrl_type	= DW_MCI_TYPE_EXYNOS5250,
> +	},
> +};
> +
> +static int dw_mci_exynos_priv_init(struct dw_mci *host)
> +{
> +	struct dw_mci_exynos_priv_data *priv;
> +	int idx;
> +
> +	priv = devm_kzalloc(host->dev, sizeof(*priv), GFP_KERNEL);
> +	if (!priv) {
> +		dev_err(host->dev, "mem alloc failed for private data\n");
> +		return -ENOMEM;
> +	}
> +
> +	for (idx = 0; idx < ARRAY_SIZE(exynos_compat); idx++) {
> +		if (of_device_is_compatible(host->dev->of_node,
> +					exynos_compat[idx].compatible))
> +			priv->ctrl_type = exynos_compat[idx].ctrl_type;
> +	}
> +
> +	host->priv = priv;
> +	return 0;
> +}
> +
> +static int dw_mci_exynos_setup_clock(struct dw_mci *host)
> +{
> +	struct dw_mci_exynos_priv_data *priv = host->priv;
> +
It assume that initial bus_hz is from clk_get_rate.
Can it be ensured? If value of bus_hz is set from platform, calculation is wrong below.

> +	if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS5250)
> +		host->bus_hz /= (priv->ciu_div + 1);
> +	else if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS4412)
> +		host->bus_hz /= EXYNOS4412_FIXED_CIU_CLK_DIV;
> +	else if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS4210)
> +		host->bus_hz /= EXYNOS4210_FIXED_CIU_CLK_DIV;
> +
> +	return 0;
Here,  returning is any meaning?
There seems to be no error case.

> +}
> +
> +static void dw_mci_exynos_prepare_command(struct dw_mci *host, u32 *cmdr)
> +{
> +	/*
> +	 * Exynos4412 and Exynos5250 extends the use of CMD register with the
> +	 * use of bit 29 (which is reserved on standard MSHC controllers) for
> +	 * optionally bypassing the HOLD register for command and data. The
> +	 * HOLD register should be bypassed in case there is no phase shift
> +	 * applied on CMD/DATA that is sent to the card.
> +	 */
> +	if (SDMMC_CLKSEL_GET_DRV_WD3(mci_readl(host, CLKSEL)))
> +		*cmdr |= SDMMC_CMD_USE_HOLD_REG;
> +}
> +
> +static void dw_mci_exynos_set_ios(struct dw_mci *host, struct mmc_ios *ios)
> +{
> +	struct dw_mci_exynos_priv_data *priv = host->priv;
> +
> +	if (ios->timing == MMC_TIMING_UHS_DDR50)
> +		mci_writel(host, CLKSEL, priv->ddr_timing);
> +	else
> +		mci_writel(host, CLKSEL, priv->sdr_timing);
> +}
> +
> +static int dw_mci_exynos_parse_dt(struct dw_mci *host)
> +{
> +	struct dw_mci_exynos_priv_data *priv = host->priv;
> +	struct device_node *np = host->dev->of_node;
> +	u32 timing[3];
u32 timing[2] is enough.

Thanks,
Seungwon Jeon

> +	u32 div = 0;
> +	int ret;
> +
> +	of_property_read_u32(np, "samsung,dw-mshc-ciu-div", &div);
> +	priv->ciu_div = div;
> +
> +	ret = of_property_read_u32_array(np,
> +			"samsung,dw-mshc-sdr-timing", timing, 2);
> +	if (ret)
> +		return ret;
> +
> +	priv->sdr_timing = SDMMC_CLKSEL_TIMING(timing[0], timing[1], div);
> +
> +	ret = of_property_read_u32_array(np,
> +			"samsung,dw-mshc-ddr-timing", timing, 2);
> +	if (ret)
> +		return ret;
> +
> +	priv->ddr_timing = SDMMC_CLKSEL_TIMING(timing[0], timing[1], div);
> +	return 0;
> +}
> +
> +static int dw_mci_exynos_setup_bus(struct dw_mci *host,
> +				struct device_node *slot_np, u8 bus_width)
> +{
> +	int idx, gpio, ret;
> +
> +	if (!slot_np)
> +		return -EINVAL;
> +
> +	/* cmd + clock + bus-width pins */
> +	for (idx = 0; idx < NUM_PINS(bus_width); idx++) {
> +		gpio = of_get_gpio(slot_np, idx);
> +		if (!gpio_is_valid(gpio)) {
> +			dev_err(host->dev, "invalid gpio: %d\n", gpio);
> +			return -EINVAL;
> +		}
> +
> +		ret = devm_gpio_request(host->dev, gpio, "dw-mci-bus");
> +		if (ret) {
> +			dev_err(host->dev, "gpio [%d] request failed\n", gpio);
> +			return -EBUSY;
> +		}
> +	}
> +
> +	gpio = of_get_named_gpio(slot_np, "wp-gpios", 0);
> +	if (gpio_is_valid(gpio)) {
> +		if (devm_gpio_request(host->dev, gpio, "dw-mci-wp"))
> +			dev_info(host->dev, "gpio [%d] request failed\n",
> +						gpio);
> +	} else {
> +		dev_info(host->dev, "wp gpio not available");
> +		host->pdata->quirks |= DW_MCI_QUIRK_NO_WRITE_PROTECT;
> +	}
> +
> +	if (host->pdata->quirks & DW_MCI_QUIRK_BROKEN_CARD_DETECTION)
> +		return 0;
> +
> +	gpio = of_get_named_gpio(slot_np, "samsung,cd-pinmux-gpio", 0);
> +	if (gpio_is_valid(gpio)) {
> +		if (devm_gpio_request(host->dev, gpio, "dw-mci-cd"))
> +			dev_err(host->dev, "gpio [%d] request failed\n", gpio);
> +	} else {
> +		dev_info(host->dev, "cd gpio not available");
> +	}
> +
> +	return 0;
> +}
> +
> +/* Exynos5250 controller specific capabilities */
> +static unsigned long exynos5250_dwmmc_caps[4] = {
> +	MMC_CAP_UHS_DDR50 | MMC_CAP_1_8V_DDR |
> +		MMC_CAP_8_BIT_DATA | MMC_CAP_CMD23,
> +	MMC_CAP_CMD23,
> +	MMC_CAP_CMD23,
> +	MMC_CAP_CMD23,
> +};
> +
> +static struct dw_mci_drv_data exynos5250_drv_data = {
> +	.caps			= exynos5250_dwmmc_caps,
> +	.init			= dw_mci_exynos_priv_init,
> +	.setup_clock		= dw_mci_exynos_setup_clock,
> +	.prepare_command	= dw_mci_exynos_prepare_command,
> +	.set_ios		= dw_mci_exynos_set_ios,
> +	.parse_dt		= dw_mci_exynos_parse_dt,
> +	.setup_bus		= dw_mci_exynos_setup_bus,
> +};
> +
> +static const struct of_device_id dw_mci_exynos_match[] = {
> +	{ .compatible = "samsung,exynos5250-dw-mshc",
> +			.data = (void *)&exynos5250_drv_data, },
> +	{},
> +};
> +MODULE_DEVICE_TABLE(of, dw_mci_pltfm_match);
> +
> +int dw_mci_exynos_probe(struct platform_device *pdev)
> +{
> +	struct dw_mci_drv_data *drv_data;
> +	const struct of_device_id *match;
> +
> +	match = of_match_node(dw_mci_exynos_match, pdev->dev.of_node);
> +	drv_data = match->data;
> +	return dw_mci_pltfm_register(pdev, drv_data);
> +}
> +
> +static struct platform_driver dw_mci_exynos_pltfm_driver = {
> +	.probe		= dw_mci_exynos_probe,
> +	.remove		= __exit_p(dw_mci_pltfm_remove),
> +	.driver		= {
> +		.name		= "dwmmc_exynos",
> +		.of_match_table	= of_match_ptr(dw_mci_exynos_match),
> +		.pm		= &dw_mci_pltfm_pmops,
> +	},
> +};
> +
> +module_platform_driver(dw_mci_exynos_pltfm_driver);
> +
> +MODULE_DESCRIPTION("Samsung Specific DW-MSHC Driver Extension");
> +MODULE_AUTHOR("Thomas Abraham <thomas.ab@samsung.com");
> +MODULE_LICENSE("GPL v2");
> +MODULE_ALIAS("platform:dwmmc-exynos");
> --
> 1.6.6.rc2
> 
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