#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 u32 sdhci_st_readl(struct sdhci_host *host, int reg)
{
u32 ret;
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)) {
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);
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");
clk_disable_unprepare(clk);
err_of:
sdhci_pltfm_free(pdev);
+err_pltfm_init:
+ if (pdata->rstc)
+ reset_control_assert(pdata->rstc);
return ret;
}
{
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);
- return sdhci_pltfm_unregister(pdev);
+ if (pdata->rstc)
+ reset_control_assert(pdata->rstc);
+
+ return ret;
}
#ifdef CONFIG_PM_SLEEP
{
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;
{
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
projects / mirror_ubuntu-bionic-kernel.git / blobdiff