On Wednesday, September 05, 2012, Thomas Abraham <thomas.abraham@xxxxxxxxxx> 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@xxxxxxxxxx>
> Acked-by: Will Newton <will.newton@xxxxxxxxxx>
> ---
> .../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@xxxxxxxxxxx");
> +MODULE_LICENSE("GPL v2");
> +MODULE_ALIAS("platform:dwmmc-exynos");
> --
> 1.6.6.rc2
>
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