[PATCH 5/5] mmc: dw_mmc: Add support DW SD/MMC driver on SOCFPGA
Dinh Nguyen
dinh.linux at gmail.com
Wed May 15 12:27:05 EDT 2013
Hi,
On 05/14/2013 11:28 PM, Jaehoon Chung wrote:
> On 05/15/2013 07:52 AM, dinguyen at altera.com 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
>> ---
>> 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 | 141 +++++++++++++++++++++++++++++++++++++
>> drivers/mmc/host/dw_mmc.h | 1 +
>> 5 files changed, 151 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
> SOCFPGA? I think good that should be changed more generic.
Not sure what you mean? SOCFPGA is the name of new ARM SOCs from Altera.
>> + 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..7eb3163
>> --- /dev/null
>> +++ b/drivers/mmc/host/dw_mmc-socfpga.c
>> @@ -0,0 +1,141 @@
>> +/*
>> + * 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/mmc/host.h>
>> +#include <linux/mmc/dw_mmc.h>
>> +#include <linux/module.h>
>> +#include <linux/of.h>
>> +#include <linux/platform_device.h>
>> +
>> +#include "dw_mmc.h"
>> +#include "dw_mmc-pltfm.h"
>> +
>> +#define SYSMGR_SDMMCGRP_CTRL_OFFSET 0x108
> Is it vendor specific register offset?
>> +#define DRV_CLK_PHASE_SHIFT_SEL_MASK 0x7
>> +#define SYSMGR_SDMMC_CTRL_SET(smplsel, drvsel) \
>> + ((((drvsel) << 0) & 0x7) | (((smplsel) << 3) & 0x38))
> Change more readable. ((drvsel & 0x7) << 0 | (smplsel & 0x7) << 3)?
>> +
>> +extern void __iomem *sys_manager_base_addr;
>> +
>> +/* SOCFPGA implementation specific driver private data */
>> +struct dw_mci_socfpga_priv_data {
>> + u8 ciu_div;
>> + u32 hs_timing;
>> +};
>> +
>> +static int dw_mci_socfpga_priv_init(struct dw_mci *host)
>> +{
>> + struct dw_mci_socfpga_priv_data *priv;
>> + struct device *dev = host->dev;
>> + int pwr_en;
>> +
>> + 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;
>> +
>> + if (of_property_read_u32(dev->of_node, "pwr-en", &pwr_en)) {
>> + dev_info(dev, "couldn't determine pwr-en, assuming pwr-en = 0\n");
>> + pwr_en = 0;
>> + }
>> +
>> + /* Set PWREN bit */
>> + mci_writel(host, PWREN, pwr_en);
> What is this setting? In dw-mmc.c, PWREN register should be set.
Ah..it was there before 3.9...I will adjust accordingly.
>> +
>> + return 0;
>> +}
>> +
>> +static int dw_mci_socfpga_setup_clock(struct dw_mci *host)
>> +{
>> + struct dw_mci_socfpga_priv_data *priv = host->priv;
>> +
>> + clk_disable(host->ciu_clk);
>> + writel(priv->hs_timing, sys_manager_base_addr +
>> + SYSMGR_SDMMCGRP_CTRL_OFFSET);
>> + clk_enable(host->ciu_clk);
> Why do you use the clk_disable/enable at this point?
Our implementation of the controller requires us to disable the clock
when we adjust the timing parameter.
>> +
>> + host->bus_hz /= priv->ciu_div;
> Didn't consider the "divide by zero"?
Will fix..
Thanks alot for the review.
Dinh
>> + 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;
>> +
>> + of_property_read_u32(np, "altr,dw-mshc-ciu-div", &div);
>> + 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)
>>
>
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