diff options
Diffstat (limited to 'drivers/mmc/host/sdhci-st.c')
| -rw-r--r-- | drivers/mmc/host/sdhci-st.c | 346 |
1 files changed, 341 insertions, 5 deletions
diff --git a/drivers/mmc/host/sdhci-st.c b/drivers/mmc/host/sdhci-st.c index 882b07e9667e..682f2bb0f4bf 100644 --- a/drivers/mmc/host/sdhci-st.c +++ b/drivers/mmc/host/sdhci-st.c @@ -23,9 +23,295 @@ #include <linux/module.h> #include <linux/err.h> #include <linux/mmc/host.h> - +#include <linux/reset.h> #include "sdhci-pltfm.h" +struct st_mmc_platform_data { + struct reset_control *rstc; + void __iomem *top_ioaddr; +}; + +/* MMCSS glue logic to setup the HC on some ST SoCs (e.g. STiH407 family) */ + +#define ST_MMC_CCONFIG_REG_1 0x400 +#define ST_MMC_CCONFIG_TIMEOUT_CLK_UNIT BIT(24) +#define ST_MMC_CCONFIG_TIMEOUT_CLK_FREQ BIT(12) +#define ST_MMC_CCONFIG_TUNING_COUNT_DEFAULT BIT(8) +#define ST_MMC_CCONFIG_ASYNC_WAKEUP BIT(0) +#define ST_MMC_CCONFIG_1_DEFAULT \ + ((ST_MMC_CCONFIG_TIMEOUT_CLK_UNIT) | \ + (ST_MMC_CCONFIG_TIMEOUT_CLK_FREQ) | \ + (ST_MMC_CCONFIG_TUNING_COUNT_DEFAULT)) + +#define ST_MMC_CCONFIG_REG_2 0x404 +#define ST_MMC_CCONFIG_HIGH_SPEED BIT(28) +#define ST_MMC_CCONFIG_ADMA2 BIT(24) +#define ST_MMC_CCONFIG_8BIT BIT(20) +#define ST_MMC_CCONFIG_MAX_BLK_LEN 16 +#define MAX_BLK_LEN_1024 1 +#define MAX_BLK_LEN_2048 2 +#define BASE_CLK_FREQ_200 0xc8 +#define BASE_CLK_FREQ_100 0x64 +#define BASE_CLK_FREQ_50 0x32 +#define ST_MMC_CCONFIG_2_DEFAULT \ + (ST_MMC_CCONFIG_HIGH_SPEED | ST_MMC_CCONFIG_ADMA2 | \ + ST_MMC_CCONFIG_8BIT | \ + (MAX_BLK_LEN_1024 << ST_MMC_CCONFIG_MAX_BLK_LEN)) + +#define ST_MMC_CCONFIG_REG_3 0x408 +#define ST_MMC_CCONFIG_EMMC_SLOT_TYPE BIT(28) +#define ST_MMC_CCONFIG_64BIT BIT(24) +#define ST_MMC_CCONFIG_ASYNCH_INTR_SUPPORT BIT(20) +#define ST_MMC_CCONFIG_1P8_VOLT BIT(16) +#define ST_MMC_CCONFIG_3P0_VOLT BIT(12) +#define ST_MMC_CCONFIG_3P3_VOLT BIT(8) +#define ST_MMC_CCONFIG_SUSP_RES_SUPPORT BIT(4) +#define ST_MMC_CCONFIG_SDMA BIT(0) +#define ST_MMC_CCONFIG_3_DEFAULT \ + (ST_MMC_CCONFIG_ASYNCH_INTR_SUPPORT | \ + ST_MMC_CCONFIG_3P3_VOLT | \ + ST_MMC_CCONFIG_SUSP_RES_SUPPORT | \ + ST_MMC_CCONFIG_SDMA) + +#define ST_MMC_CCONFIG_REG_4 0x40c +#define ST_MMC_CCONFIG_D_DRIVER BIT(20) +#define ST_MMC_CCONFIG_C_DRIVER BIT(16) +#define ST_MMC_CCONFIG_A_DRIVER BIT(12) +#define ST_MMC_CCONFIG_DDR50 BIT(8) +#define ST_MMC_CCONFIG_SDR104 BIT(4) +#define ST_MMC_CCONFIG_SDR50 BIT(0) +#define ST_MMC_CCONFIG_4_DEFAULT 0 + +#define ST_MMC_CCONFIG_REG_5 0x410 +#define ST_MMC_CCONFIG_TUNING_FOR_SDR50 BIT(8) +#define RETUNING_TIMER_CNT_MAX 0xf +#define ST_MMC_CCONFIG_5_DEFAULT 0 + +/* I/O configuration for Arasan IP */ +#define ST_MMC_GP_OUTPUT 0x450 +#define ST_MMC_GP_OUTPUT_CD BIT(12) + +#define ST_MMC_STATUS_R 0x460 + +#define ST_TOP_MMC_DLY_FIX_OFF(x) (x - 0x8) + +/* TOP config registers to manage static and dynamic delay */ +#define ST_TOP_MMC_TX_CLK_DLY ST_TOP_MMC_DLY_FIX_OFF(0x8) +#define ST_TOP_MMC_RX_CLK_DLY ST_TOP_MMC_DLY_FIX_OFF(0xc) +/* MMC delay control register */ +#define ST_TOP_MMC_DLY_CTRL ST_TOP_MMC_DLY_FIX_OFF(0x18) +#define ST_TOP_MMC_DLY_CTRL_DLL_BYPASS_CMD BIT(0) +#define ST_TOP_MMC_DLY_CTRL_DLL_BYPASS_PH_SEL BIT(1) +#define ST_TOP_MMC_DLY_CTRL_TX_DLL_ENABLE BIT(8) +#define ST_TOP_MMC_DLY_CTRL_RX_DLL_ENABLE BIT(9) +#define ST_TOP_MMC_DLY_CTRL_ATUNE_NOT_CFG_DLY BIT(10) +#define ST_TOP_MMC_START_DLL_LOCK BIT(11) + +/* register to provide the phase-shift value for DLL */ +#define ST_TOP_MMC_TX_DLL_STEP_DLY ST_TOP_MMC_DLY_FIX_OFF(0x1c) +#define ST_TOP_MMC_RX_DLL_STEP_DLY ST_TOP_MMC_DLY_FIX_OFF(0x20) +#define ST_TOP_MMC_RX_CMD_STEP_DLY ST_TOP_MMC_DLY_FIX_OFF(0x24) + +/* phase shift delay on the tx clk 2.188ns */ +#define ST_TOP_MMC_TX_DLL_STEP_DLY_VALID 0x6 + +#define ST_TOP_MMC_DLY_MAX 0xf + +#define ST_TOP_MMC_DYN_DLY_CONF \ + (ST_TOP_MMC_DLY_CTRL_TX_DLL_ENABLE | \ + ST_TOP_MMC_DLY_CTRL_ATUNE_NOT_CFG_DLY | \ + ST_TOP_MMC_START_DLL_LOCK) + +/* + * For clock speeds greater than 90MHz, we need to check that the + * DLL procedure has finished before switching to ultra-speed modes. + */ +#define CLK_TO_CHECK_DLL_LOCK 90000000 + +static inline void st_mmcss_set_static_delay(void __iomem *ioaddr) +{ + if (!ioaddr) + return; + + writel_relaxed(0x0, ioaddr + ST_TOP_MMC_DLY_CTRL); + writel_relaxed(ST_TOP_MMC_DLY_MAX, + ioaddr + ST_TOP_MMC_TX_CLK_DLY); +} + +/** + * st_mmcss_cconfig: configure the Arasan HC inside the flashSS. + * @np: dt device node. + * @host: sdhci host + * Description: this function is to configure the Arasan host controller. + * On some ST SoCs, i.e. STiH407 family, the MMC devices inside a dedicated + * flashSS sub-system which needs to be configured to be compliant to eMMC 4.5 + * or eMMC4.3. This has to be done before registering the sdhci host. + */ +static void st_mmcss_cconfig(struct device_node *np, struct sdhci_host *host) +{ + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct mmc_host *mhost = host->mmc; + u32 cconf2, cconf3, cconf4, cconf5; + + if (!of_device_is_compatible(np, "st,sdhci-stih407")) + return; + + cconf2 = ST_MMC_CCONFIG_2_DEFAULT; + cconf3 = ST_MMC_CCONFIG_3_DEFAULT; + cconf4 = ST_MMC_CCONFIG_4_DEFAULT; + cconf5 = ST_MMC_CCONFIG_5_DEFAULT; + + writel_relaxed(ST_MMC_CCONFIG_1_DEFAULT, + host->ioaddr + ST_MMC_CCONFIG_REG_1); + + /* Set clock frequency, default to 50MHz if max-frequency is not + * provided */ + + switch (mhost->f_max) { + case 200000000: + clk_set_rate(pltfm_host->clk, mhost->f_max); + cconf2 |= BASE_CLK_FREQ_200; + break; + case 100000000: + clk_set_rate(pltfm_host->clk, mhost->f_max); + cconf2 |= BASE_CLK_FREQ_100; + break; + default: + clk_set_rate(pltfm_host->clk, 50000000); + cconf2 |= BASE_CLK_FREQ_50; + } + + writel_relaxed(cconf2, host->ioaddr + ST_MMC_CCONFIG_REG_2); + + if (mhost->caps & MMC_CAP_NONREMOVABLE) + cconf3 |= ST_MMC_CCONFIG_EMMC_SLOT_TYPE; + else + /* CARD _D ET_CTRL */ + writel_relaxed(ST_MMC_GP_OUTPUT_CD, + host->ioaddr + ST_MMC_GP_OUTPUT); + + if (mhost->caps & MMC_CAP_UHS_SDR50) { + /* use 1.8V */ + cconf3 |= ST_MMC_CCONFIG_1P8_VOLT; + cconf4 |= ST_MMC_CCONFIG_SDR50; + /* Use tuning */ + cconf5 |= ST_MMC_CCONFIG_TUNING_FOR_SDR50; + /* Max timeout for retuning */ + cconf5 |= RETUNING_TIMER_CNT_MAX; + } + + if (mhost->caps & MMC_CAP_UHS_SDR104) { + /* + * SDR104 implies the HC can support HS200 mode, so + * it's mandatory to use 1.8V + */ + cconf3 |= ST_MMC_CCONFIG_1P8_VOLT; + cconf4 |= ST_MMC_CCONFIG_SDR104; + /* Max timeout for retuning */ + cconf5 |= RETUNING_TIMER_CNT_MAX; + } + + if (mhost->caps & MMC_CAP_UHS_DDR50) + cconf4 |= ST_MMC_CCONFIG_DDR50; + + writel_relaxed(cconf3, host->ioaddr + ST_MMC_CCONFIG_REG_3); + writel_relaxed(cconf4, host->ioaddr + ST_MMC_CCONFIG_REG_4); + writel_relaxed(cconf5, host->ioaddr + ST_MMC_CCONFIG_REG_5); +} + +static inline void st_mmcss_set_dll(void __iomem *ioaddr) +{ + if (!ioaddr) + return; + + writel_relaxed(ST_TOP_MMC_DYN_DLY_CONF, ioaddr + ST_TOP_MMC_DLY_CTRL); + writel_relaxed(ST_TOP_MMC_TX_DLL_STEP_DLY_VALID, + ioaddr + ST_TOP_MMC_TX_DLL_STEP_DLY); +} + +static int st_mmcss_lock_dll(void __iomem *ioaddr) +{ + unsigned long curr, value; + unsigned long finish = jiffies + HZ; + + /* Checks if the DLL procedure is finished */ + do { + curr = jiffies; + value = readl(ioaddr + ST_MMC_STATUS_R); + if (value & 0x1) + return 0; + + cpu_relax(); + } while (!time_after_eq(curr, finish)); + + return -EBUSY; +} + +static int sdhci_st_set_dll_for_clock(struct sdhci_host *host) +{ + int ret = 0; + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct st_mmc_platform_data *pdata = pltfm_host->priv; + + if (host->clock > CLK_TO_CHECK_DLL_LOCK) { + st_mmcss_set_dll(pdata->top_ioaddr); + ret = st_mmcss_lock_dll(host->ioaddr); + } + + return ret; +} + +static void sdhci_st_set_uhs_signaling(struct sdhci_host *host, + unsigned int uhs) +{ + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct st_mmc_platform_data *pdata = pltfm_host->priv; + u16 ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2); + int ret = 0; + + /* Select Bus Speed Mode for host */ + ctrl_2 &= ~SDHCI_CTRL_UHS_MASK; + switch (uhs) { + /* + * Set V18_EN -- UHS modes do not work without this. + * does not change signaling voltage + */ + + case MMC_TIMING_UHS_SDR12: + st_mmcss_set_static_delay(pdata->top_ioaddr); + ctrl_2 |= SDHCI_CTRL_UHS_SDR12 | SDHCI_CTRL_VDD_180; + break; + case MMC_TIMING_UHS_SDR25: + st_mmcss_set_static_delay(pdata->top_ioaddr); + ctrl_2 |= SDHCI_CTRL_UHS_SDR25 | SDHCI_CTRL_VDD_180; + break; + case MMC_TIMING_UHS_SDR50: + st_mmcss_set_static_delay(pdata->top_ioaddr); + ctrl_2 |= SDHCI_CTRL_UHS_SDR50 | SDHCI_CTRL_VDD_180; + ret = sdhci_st_set_dll_for_clock(host); + break; + case MMC_TIMING_UHS_SDR104: + case MMC_TIMING_MMC_HS200: + st_mmcss_set_static_delay(pdata->top_ioaddr); + ctrl_2 |= SDHCI_CTRL_UHS_SDR104 | SDHCI_CTRL_VDD_180; + ret = sdhci_st_set_dll_for_clock(host); + break; + case MMC_TIMING_UHS_DDR50: + case MMC_TIMING_MMC_DDR52: + st_mmcss_set_static_delay(pdata->top_ioaddr); + ctrl_2 |= SDHCI_CTRL_UHS_DDR50 | SDHCI_CTRL_VDD_180; + break; + } + + if (ret) + dev_warn(mmc_dev(host->mmc), "Error setting dll for clock " + "(uhs %d)\n", uhs); + + dev_dbg(mmc_dev(host->mmc), "uhs %d, ctrl_2 %04X\n", uhs, ctrl_2); + + sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2); +} + static u32 sdhci_st_readl(struct sdhci_host *host, int reg) { u32 ret; @@ -48,22 +334,33 @@ static const struct sdhci_ops sdhci_st_ops = { .set_bus_width = sdhci_set_bus_width, .read_l = sdhci_st_readl, .reset = sdhci_reset, + .set_uhs_signaling = sdhci_st_set_uhs_signaling, }; static const struct sdhci_pltfm_data sdhci_st_pdata = { .ops = &sdhci_st_ops, .quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC | - SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN, + SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN | + SDHCI_QUIRK_NO_HISPD_BIT, + .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN | + SDHCI_QUIRK2_STOP_WITH_TC, }; static int sdhci_st_probe(struct platform_device *pdev) { + struct device_node *np = pdev->dev.of_node; struct sdhci_host *host; + struct st_mmc_platform_data *pdata; struct sdhci_pltfm_host *pltfm_host; struct clk *clk; int ret = 0; u16 host_version; + struct resource *res; + + pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) + return -ENOMEM; clk = devm_clk_get(&pdev->dev, "mmc"); if (IS_ERR(clk)) { @@ -71,10 +368,17 @@ static int sdhci_st_probe(struct platform_device *pdev) return PTR_ERR(clk); } + pdata->rstc = devm_reset_control_get(&pdev->dev, NULL); + if (IS_ERR(pdata->rstc)) + pdata->rstc = NULL; + else + reset_control_deassert(pdata->rstc); + host = sdhci_pltfm_init(pdev, &sdhci_st_pdata, 0); if (IS_ERR(host)) { dev_err(&pdev->dev, "Failed sdhci_pltfm_init\n"); - return PTR_ERR(host); + ret = PTR_ERR(host); + goto err_pltfm_init; } ret = mmc_of_parse(host->mmc); @@ -85,9 +389,22 @@ static int sdhci_st_probe(struct platform_device *pdev) clk_prepare_enable(clk); + /* Configure the FlashSS Top registers for setting eMMC TX/RX delay */ + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, + "top-mmc-delay"); + pdata->top_ioaddr = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(pdata->top_ioaddr)) { + dev_warn(&pdev->dev, "FlashSS Top Dly registers not available"); + pdata->top_ioaddr = NULL; + } + pltfm_host = sdhci_priv(host); + pltfm_host->priv = pdata; pltfm_host->clk = clk; + /* Configure the Arasan HC inside the flashSS */ + st_mmcss_cconfig(np, host); + ret = sdhci_add_host(host); if (ret) { dev_err(&pdev->dev, "Failed sdhci_add_host\n"); @@ -109,6 +426,9 @@ err_out: clk_disable_unprepare(clk); err_of: sdhci_pltfm_free(pdev); +err_pltfm_init: + if (pdata->rstc) + reset_control_assert(pdata->rstc); return ret; } @@ -117,10 +437,15 @@ static int sdhci_st_remove(struct platform_device *pdev) { struct sdhci_host *host = platform_get_drvdata(pdev); struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct st_mmc_platform_data *pdata = pltfm_host->priv; + int ret; - clk_disable_unprepare(pltfm_host->clk); + ret = sdhci_pltfm_unregister(pdev); + + if (pdata->rstc) + reset_control_assert(pdata->rstc); - return sdhci_pltfm_unregister(pdev); + return ret; } #ifdef CONFIG_PM_SLEEP @@ -128,11 +453,15 @@ static int sdhci_st_suspend(struct device *dev) { struct sdhci_host *host = dev_get_drvdata(dev); struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct st_mmc_platform_data *pdata = pltfm_host->priv; int ret = sdhci_suspend_host(host); if (ret) goto out; + if (pdata->rstc) + reset_control_assert(pdata->rstc); + clk_disable_unprepare(pltfm_host->clk); out: return ret; @@ -142,9 +471,16 @@ static int sdhci_st_resume(struct device *dev) { struct sdhci_host *host = dev_get_drvdata(dev); struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct st_mmc_platform_data *pdata = pltfm_host->priv; + struct device_node *np = dev->of_node; clk_prepare_enable(pltfm_host->clk); + if (pdata->rstc) + reset_control_deassert(pdata->rstc); + + st_mmcss_cconfig(np, host); + return sdhci_resume_host(host); } #endif |