[PATCHv3 6/6] mmc: dw_mmc: Add support DW SD/MMC driver on SOCFPGA
Seungwon Jeon
tgih.jun at samsung.com
Fri May 24 00:07:58 EDT 2013
Just one minor comment below.
On 05/24/13, 6:37 AM, Dinh Nguyen wrote:
> From: Dinh Nguyen <dinguyen at altera.com>
>
> Add platform specific functionality for the DW SD/MMC driver for
> SoCFPGA. Move SDMMC_CMD_USE_HOLD_REG to dw_mmc.h so other platforms
> can use this define.
>
> Signed-off-by: Dinh Nguyen <dinguyen at altera.com>
> CC: Seungwon Jeon <tgih.jun at samsung.com>
> CC: Jaehoon Chung <jh80.chung at samsung.com>
> CC: Arnd Bergmann <arnd at arndb.de>
> CC: Olof Johansson <olof at lixom.net>
> CC: Pavel Machek <pavel at denx.de>
> CC: linux-mmc at vger.kernel.org
>
> v3:
> - Addressed comments from Seugwon, Jaehoon, and Pavel
> - Use clk_disable_unprepare/clk_prepare_enable
>
> v2:
> - Use syscon and regmap
> - Avoid divide by zero
> - Remove the need to set PWR_EN
> ---
> drivers/mmc/host/Kconfig | 8 +++
> drivers/mmc/host/Makefile | 1 +
> drivers/mmc/host/dw_mmc-exynos.c | 2 -
> drivers/mmc/host/dw_mmc-socfpga.c | 139 +++++++++++++++++++++++++++++++++++++
> drivers/mmc/host/dw_mmc.h | 1 +
> 5 files changed, 149 insertions(+), 2 deletions(-)
> create mode 100644 drivers/mmc/host/dw_mmc-socfpga.c
>
> diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
> index 9ab8f8d..1be2289 100644
> --- a/drivers/mmc/host/Kconfig
> +++ b/drivers/mmc/host/Kconfig
> @@ -556,6 +556,14 @@ config MMC_DW_EXYNOS
> Synopsys DesignWare Memory Card Interface driver. Select this option
> for platforms based on Exynos4 and Exynos5 SoC's.
>
> +config MMC_DW_SOCFPGA
> + tristate "SOCFPGA specific extensions for Synopsys DW Memory Card Interface"
> + depends on MMC_DW
> + select MMC_DW_PLTFM
> + help
> + This selects support for Altera SoCFPGA specific extensions to the
> + Synopsys DesignWare Memory Card Interface driver.
> +
> 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 cd32280..67718c1 100644
> --- a/drivers/mmc/host/Makefile
> +++ b/drivers/mmc/host/Makefile
> @@ -42,6 +42,7 @@ 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-$(CONFIG_MMC_DW_SOCFPGA) += dw_mmc-socfpga.o
> obj-$(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
> index f013e7e..866edef 100644
> --- a/drivers/mmc/host/dw_mmc-exynos.c
> +++ b/drivers/mmc/host/dw_mmc-exynos.c
> @@ -31,8 +31,6 @@
> 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
>
> diff --git a/drivers/mmc/host/dw_mmc-socfpga.c b/drivers/mmc/host/dw_mmc-socfpga.c
> new file mode 100644
> index 0000000..3cc1afc
> --- /dev/null
> +++ b/drivers/mmc/host/dw_mmc-socfpga.c
> @@ -0,0 +1,139 @@
> +/*
> + * Altera SoCFPGA Specific Extensions for Synopsys DW Multimedia Card Interface driver
> + *
> + * Copyright (C) 2012, Samsung Electronics Co., Ltd.
> + * Copyright (C) 2013 Altera Corporation
> + *
> + * 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.
> + *
> + * Taken from dw_mmc-exynos.c
> + */
> +#include <linux/clk.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/mmc/host.h>
> +#include <linux/mmc/dw_mmc.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +
> +#include "dw_mmc.h"
> +#include "dw_mmc-pltfm.h"
> +
> +#define SYSMGR_SDMMCGRP_CTRL_OFFSET 0x108
> +#define DRV_CLK_PHASE_SHIFT_SEL_MASK 0x7
> +#define SYSMGR_SDMMC_CTRL_SET(smplsel, drvsel) \
> + ((((smplsel) & 0x38) << 3) | (((drvsel) & 0x7) << 0))
> +
> +/* SOCFPGA implementation specific driver private data */
> +struct dw_mci_socfpga_priv_data {
> + u8 ciu_div; /* card interface unit divisor */
> + u32 hs_timing; /* bitmask for CIU clock phase shift */
> + struct regmap *sysreg; /* regmap for system manager register */
> +};
> +
> +static int dw_mci_socfpga_priv_init(struct dw_mci *host)
> +{
> + struct dw_mci_socfpga_priv_data *priv;
> +
> + priv = devm_kzalloc(host->dev, sizeof(*priv), GFP_KERNEL);
> + if (!priv) {
> + dev_err(host->dev, "mem alloc failed for private data\n");
> + return -ENOMEM;
> + }
> +
> + host->priv = priv;
> +
> + priv->sysreg = syscon_regmap_lookup_by_compatible("altr,sys-mgr");
> + if (IS_ERR(priv->sysreg)) {
> + dev_err(host->dev, "regmap for altr,sys-mgr lookup failed.\n");
> + return PTR_ERR(priv->sysreg);
> + }
'host->priv = priv;' is expected here after all is done with success.
Thanks,
Seungwon Jeon
> +
> + return 0;
> +}
> +
> +static int dw_mci_socfpga_setup_clock(struct dw_mci *host)
> +{
> + struct dw_mci_socfpga_priv_data *priv = host->priv;
> +
> + clk_disable_unprepare(host->ciu_clk);
> + regmap_write(priv->sysreg, SYSMGR_SDMMCGRP_CTRL_OFFSET, priv->hs_timing);
> + clk_prepare_enable(host->ciu_clk);
> +
> + host->bus_hz /= (priv->ciu_div + 1);
> + return 0;
> +}
> +
> +static void dw_mci_socfpga_prepare_command(struct dw_mci *host, u32 *cmdr)
> +{
> + struct dw_mci_socfpga_priv_data *priv = host->priv;
> +
> + if (priv->hs_timing & DRV_CLK_PHASE_SHIFT_SEL_MASK)
> + *cmdr |= SDMMC_CMD_USE_HOLD_REG;
> +}
> +
> +static int dw_mci_socfpga_parse_dt(struct dw_mci *host)
> +{
> + struct dw_mci_socfpga_priv_data *priv = host->priv;
> + struct device_node *np = host->dev->of_node;
> + u32 timing[2];
> + u32 div = 0;
> + int ret;
> +
> + ret = of_property_read_u32(np, "altr,dw-mshc-ciu-div", &div);
> + if (ret)
> + dev_info(host->dev, "No dw-mshc-ciu-div specified, assuming 1");
> + priv->ciu_div = div;
> +
> + ret = of_property_read_u32_array(np,
> + "altr,dw-mshc-sdr-timing", timing, 2);
> + if (ret)
> + return ret;
> +
> + priv->hs_timing = SYSMGR_SDMMC_CTRL_SET(timing[0], timing[1]);
> + return 0;
> +}
> +
> +static const struct dw_mci_drv_data socfpga_drv_data = {
> + .init = dw_mci_socfpga_priv_init,
> + .setup_clock = dw_mci_socfpga_setup_clock,
> + .prepare_command = dw_mci_socfpga_prepare_command,
> + .parse_dt = dw_mci_socfpga_parse_dt,
> +};
> +
> +static const struct of_device_id dw_mci_socfpga_match[] = {
> + { .compatible = "altr,socfpga-dw-mshc",
> + .data = &socfpga_drv_data, },
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, dw_mci_socfpga_match);
> +
> +int dw_mci_socfpga_probe(struct platform_device *pdev)
> +{
> + const struct dw_mci_drv_data *drv_data;
> + const struct of_device_id *match;
> +
> + match = of_match_node(dw_mci_socfpga_match, pdev->dev.of_node);
> + drv_data = match->data;
> + return dw_mci_pltfm_register(pdev, drv_data);
> +}
> +
> +static struct platform_driver dw_mci_socfpga_pltfm_driver = {
> + .probe = dw_mci_socfpga_probe,
> + .remove = __exit_p(dw_mci_pltfm_remove),
> + .driver = {
> + .name = "dwmmc_socfpga",
> + .of_match_table = of_match_ptr(dw_mci_socfpga_match),
> + .pm = &dw_mci_pltfm_pmops,
> + },
> +};
> +
> +module_platform_driver(dw_mci_socfpga_pltfm_driver);
> +
> +MODULE_DESCRIPTION("Altera SOCFPGA Specific DW-MSHC Driver Extension");
> +MODULE_LICENSE("GPL v2");
> +MODULE_ALIAS("platform:dwmmc-socfpga");
> diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h
> index 0b74189..3700cb2 100644
> --- a/drivers/mmc/host/dw_mmc.h
> +++ b/drivers/mmc/host/dw_mmc.h
> @@ -111,6 +111,7 @@
> #define SDMMC_INT_ERROR 0xbfc2
> /* Command register defines */
> #define SDMMC_CMD_START BIT(31)
> +#define SDMMC_CMD_USE_HOLD_REG BIT(29)
> #define SDMMC_CMD_CCS_EXP BIT(23)
> #define SDMMC_CMD_CEATA_RD BIT(22)
> #define SDMMC_CMD_UPD_CLK BIT(21)
> --
> 1.7.9.5
>
>
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