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path: root/drivers/mmc/host/sdhci-msm.c
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Diffstat (limited to 'drivers/mmc/host/sdhci-msm.c')
-rw-r--r--drivers/mmc/host/sdhci-msm.c377
1 files changed, 225 insertions, 152 deletions
diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
index 32879b845b75..10cdc84d5113 100644
--- a/drivers/mmc/host/sdhci-msm.c
+++ b/drivers/mmc/host/sdhci-msm.c
@@ -69,6 +69,7 @@
#define CORE_DLL_CLOCK_DISABLE BIT(21)
#define CORE_VENDOR_SPEC 0x10c
+#define CORE_VENDOR_SPEC_POR_VAL 0xa1c
#define CORE_CLK_PWRSAVE BIT(1)
#define CORE_HC_MCLK_SEL_DFLT (2 << 8)
#define CORE_HC_MCLK_SEL_HS400 (3 << 8)
@@ -102,6 +103,7 @@
#define CORE_DDR_200_CFG 0x184
#define CORE_CDC_T4_DLY_SEL BIT(0)
+#define CORE_CMDIN_RCLK_EN BIT(1)
#define CORE_START_CDC_TRAFFIC BIT(6)
#define CORE_VENDOR_SPEC3 0x1b0
#define CORE_PWRSAVE_DLL BIT(3)
@@ -138,6 +140,46 @@ struct sdhci_msm_host {
bool use_cdclp533;
};
+static unsigned int msm_get_clock_rate_for_bus_mode(struct sdhci_host *host,
+ unsigned int clock)
+{
+ struct mmc_ios ios = host->mmc->ios;
+ /*
+ * The SDHC requires internal clock frequency to be double the
+ * actual clock that will be set for DDR mode. The controller
+ * uses the faster clock(100/400MHz) for some of its parts and
+ * send the actual required clock (50/200MHz) to the card.
+ */
+ if (ios.timing == MMC_TIMING_UHS_DDR50 ||
+ ios.timing == MMC_TIMING_MMC_DDR52 ||
+ ios.timing == MMC_TIMING_MMC_HS400 ||
+ host->flags & SDHCI_HS400_TUNING)
+ clock *= 2;
+ return clock;
+}
+
+static void msm_set_clock_rate_for_bus_mode(struct sdhci_host *host,
+ unsigned int clock)
+{
+ struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+ struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
+ struct mmc_ios curr_ios = host->mmc->ios;
+ int rc;
+
+ clock = msm_get_clock_rate_for_bus_mode(host, clock);
+ rc = clk_set_rate(msm_host->clk, clock);
+ if (rc) {
+ pr_err("%s: Failed to set clock at rate %u at timing %d\n",
+ mmc_hostname(host->mmc), clock,
+ curr_ios.timing);
+ return;
+ }
+ msm_host->clk_rate = clock;
+ pr_debug("%s: Setting clock at rate %lu at timing %d\n",
+ mmc_hostname(host->mmc), clk_get_rate(msm_host->clk),
+ curr_ios.timing);
+}
+
/* Platform specific tuning */
static inline int msm_dll_poll_ck_out_en(struct sdhci_host *host, u8 poll)
{
@@ -464,6 +506,122 @@ static int msm_init_cm_dll(struct sdhci_host *host)
return 0;
}
+static void msm_hc_select_default(struct sdhci_host *host)
+{
+ struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+ struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
+ u32 config;
+
+ if (!msm_host->use_cdclp533) {
+ config = readl_relaxed(host->ioaddr +
+ CORE_VENDOR_SPEC3);
+ config &= ~CORE_PWRSAVE_DLL;
+ writel_relaxed(config, host->ioaddr +
+ CORE_VENDOR_SPEC3);
+ }
+
+ config = readl_relaxed(host->ioaddr + CORE_VENDOR_SPEC);
+ config &= ~CORE_HC_MCLK_SEL_MASK;
+ config |= CORE_HC_MCLK_SEL_DFLT;
+ writel_relaxed(config, host->ioaddr + CORE_VENDOR_SPEC);
+
+ /*
+ * Disable HC_SELECT_IN to be able to use the UHS mode select
+ * configuration from Host Control2 register for all other
+ * modes.
+ * Write 0 to HC_SELECT_IN and HC_SELECT_IN_EN field
+ * in VENDOR_SPEC_FUNC
+ */
+ config = readl_relaxed(host->ioaddr + CORE_VENDOR_SPEC);
+ config &= ~CORE_HC_SELECT_IN_EN;
+ config &= ~CORE_HC_SELECT_IN_MASK;
+ writel_relaxed(config, host->ioaddr + CORE_VENDOR_SPEC);
+
+ /*
+ * Make sure above writes impacting free running MCLK are completed
+ * before changing the clk_rate at GCC.
+ */
+ wmb();
+}
+
+static void msm_hc_select_hs400(struct sdhci_host *host)
+{
+ struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+ struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
+ struct mmc_ios ios = host->mmc->ios;
+ u32 config, dll_lock;
+ int rc;
+
+ /* Select the divided clock (free running MCLK/2) */
+ config = readl_relaxed(host->ioaddr + CORE_VENDOR_SPEC);
+ config &= ~CORE_HC_MCLK_SEL_MASK;
+ config |= CORE_HC_MCLK_SEL_HS400;
+
+ writel_relaxed(config, host->ioaddr + CORE_VENDOR_SPEC);
+ /*
+ * Select HS400 mode using the HC_SELECT_IN from VENDOR SPEC
+ * register
+ */
+ if ((msm_host->tuning_done || ios.enhanced_strobe) &&
+ !msm_host->calibration_done) {
+ config = readl_relaxed(host->ioaddr + CORE_VENDOR_SPEC);
+ config |= CORE_HC_SELECT_IN_HS400;
+ config |= CORE_HC_SELECT_IN_EN;
+ writel_relaxed(config, host->ioaddr + CORE_VENDOR_SPEC);
+ }
+ if (!msm_host->clk_rate && !msm_host->use_cdclp533) {
+ /*
+ * Poll on DLL_LOCK or DDR_DLL_LOCK bits in
+ * CORE_DLL_STATUS to be set. This should get set
+ * within 15 us at 200 MHz.
+ */
+ rc = readl_relaxed_poll_timeout(host->ioaddr +
+ CORE_DLL_STATUS,
+ dll_lock,
+ (dll_lock &
+ (CORE_DLL_LOCK |
+ CORE_DDR_DLL_LOCK)), 10,
+ 1000);
+ if (rc == -ETIMEDOUT)
+ pr_err("%s: Unable to get DLL_LOCK/DDR_DLL_LOCK, dll_status: 0x%08x\n",
+ mmc_hostname(host->mmc), dll_lock);
+ }
+ /*
+ * Make sure above writes impacting free running MCLK are completed
+ * before changing the clk_rate at GCC.
+ */
+ wmb();
+}
+
+/*
+ * sdhci_msm_hc_select_mode :- In general all timing modes are
+ * controlled via UHS mode select in Host Control2 register.
+ * eMMC specific HS200/HS400 doesn't have their respective modes
+ * defined here, hence we use these values.
+ *
+ * HS200 - SDR104 (Since they both are equivalent in functionality)
+ * HS400 - This involves multiple configurations
+ * Initially SDR104 - when tuning is required as HS200
+ * Then when switching to DDR @ 400MHz (HS400) we use
+ * the vendor specific HC_SELECT_IN to control the mode.
+ *
+ * In addition to controlling the modes we also need to select the
+ * correct input clock for DLL depending on the mode.
+ *
+ * HS400 - divided clock (free running MCLK/2)
+ * All other modes - default (free running MCLK)
+ */
+void sdhci_msm_hc_select_mode(struct sdhci_host *host)
+{
+ struct mmc_ios ios = host->mmc->ios;
+
+ if (ios.timing == MMC_TIMING_MMC_HS400 ||
+ host->flags & SDHCI_HS400_TUNING)
+ msm_hc_select_hs400(host);
+ else
+ msm_hc_select_default(host);
+}
+
static int sdhci_msm_cdclp533_calibration(struct sdhci_host *host)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
@@ -506,19 +664,7 @@ static int sdhci_msm_cdclp533_calibration(struct sdhci_host *host)
config &= ~CORE_START_CDC_TRAFFIC;
writel_relaxed(config, host->ioaddr + CORE_DDR_200_CFG);
- /*
- * Perform CDC Register Initialization Sequence
- *
- * CORE_CSR_CDC_CTLR_CFG0 0x11800EC
- * CORE_CSR_CDC_CTLR_CFG1 0x3011111
- * CORE_CSR_CDC_CAL_TIMER_CFG0 0x1201000
- * CORE_CSR_CDC_CAL_TIMER_CFG1 0x4
- * CORE_CSR_CDC_REFCOUNT_CFG 0xCB732020
- * CORE_CSR_CDC_COARSE_CAL_CFG 0xB19
- * CORE_CSR_CDC_DELAY_CFG 0x3AC
- * CORE_CDC_OFFSET_CFG 0x0
- * CORE_CDC_SLAVE_DDA_CFG 0x16334
- */
+ /* Perform CDC Register Initialization Sequence */
writel_relaxed(0x11800EC, host->ioaddr + CORE_CSR_CDC_CTLR_CFG0);
writel_relaxed(0x3011111, host->ioaddr + CORE_CSR_CDC_CTLR_CFG1);
@@ -526,7 +672,7 @@ static int sdhci_msm_cdclp533_calibration(struct sdhci_host *host)
writel_relaxed(0x4, host->ioaddr + CORE_CSR_CDC_CAL_TIMER_CFG1);
writel_relaxed(0xCB732020, host->ioaddr + CORE_CSR_CDC_REFCOUNT_CFG);
writel_relaxed(0xB19, host->ioaddr + CORE_CSR_CDC_COARSE_CAL_CFG);
- writel_relaxed(0x3AC, host->ioaddr + CORE_CSR_CDC_DELAY_CFG);
+ writel_relaxed(0x4E2, host->ioaddr + CORE_CSR_CDC_DELAY_CFG);
writel_relaxed(0x0, host->ioaddr + CORE_CDC_OFFSET_CFG);
writel_relaxed(0x16334, host->ioaddr + CORE_CDC_SLAVE_DDA_CFG);
@@ -579,6 +725,7 @@ out:
static int sdhci_msm_cm_dll_sdc4_calibration(struct sdhci_host *host)
{
+ struct mmc_host *mmc = host->mmc;
u32 dll_status, config;
int ret;
@@ -593,6 +740,12 @@ static int sdhci_msm_cm_dll_sdc4_calibration(struct sdhci_host *host)
*/
writel_relaxed(DDR_CONFIG_POR_VAL, host->ioaddr + CORE_DDR_CONFIG);
+ if (mmc->ios.enhanced_strobe) {
+ config = readl_relaxed(host->ioaddr + CORE_DDR_200_CFG);
+ config |= CORE_CMDIN_RCLK_EN;
+ writel_relaxed(config, host->ioaddr + CORE_DDR_200_CFG);
+ }
+
config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG_2);
config |= CORE_DDR_CAL_EN;
writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG_2);
@@ -627,6 +780,7 @@ static int sdhci_msm_hs400_dll_calibration(struct sdhci_host *host)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
+ struct mmc_host *mmc = host->mmc;
int ret;
u32 config;
@@ -640,14 +794,17 @@ static int sdhci_msm_hs400_dll_calibration(struct sdhci_host *host)
if (ret)
goto out;
- /* Set the selected phase in delay line hw block */
- ret = msm_config_cm_dll_phase(host, msm_host->saved_tuning_phase);
- if (ret)
- goto out;
+ if (!mmc->ios.enhanced_strobe) {
+ /* Set the selected phase in delay line hw block */
+ ret = msm_config_cm_dll_phase(host,
+ msm_host->saved_tuning_phase);
+ if (ret)
+ goto out;
+ config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG);
+ config |= CORE_CMD_DAT_TRACK_SEL;
+ writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG);
+ }
- config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG);
- config |= CORE_CMD_DAT_TRACK_SEL;
- writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG);
if (msm_host->use_cdclp533)
ret = sdhci_msm_cdclp533_calibration(host);
else
@@ -658,12 +815,12 @@ out:
return ret;
}
-static int sdhci_msm_execute_tuning(struct sdhci_host *host, u32 opcode)
+static int sdhci_msm_execute_tuning(struct mmc_host *mmc, u32 opcode)
{
+ struct sdhci_host *host = mmc_priv(mmc);
int tuning_seq_cnt = 3;
u8 phase, tuned_phases[16], tuned_phase_cnt = 0;
int rc;
- struct mmc_host *mmc = host->mmc;
struct mmc_ios ios = host->mmc->ios;
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
@@ -678,6 +835,17 @@ static int sdhci_msm_execute_tuning(struct sdhci_host *host, u32 opcode)
ios.timing == MMC_TIMING_UHS_SDR104))
return 0;
+ /*
+ * For HS400 tuning in HS200 timing requires:
+ * - select MCLK/2 in VENDOR_SPEC
+ * - program MCLK to 400MHz (or nearest supported) in GCC
+ */
+ if (host->flags & SDHCI_HS400_TUNING) {
+ sdhci_msm_hc_select_mode(host);
+ msm_set_clock_rate_for_bus_mode(host, ios.clock);
+ host->flags &= ~SDHCI_HS400_TUNING;
+ }
+
retry:
/* First of all reset the tuning block */
rc = msm_init_cm_dll(host);
@@ -732,6 +900,30 @@ retry:
return rc;
}
+/*
+ * sdhci_msm_hs400 - Calibrate the DLL for HS400 bus speed mode operation.
+ * This needs to be done for both tuning and enhanced_strobe mode.
+ * DLL operation is only needed for clock > 100MHz. For clock <= 100MHz
+ * fixed feedback clock is used.
+ */
+static void sdhci_msm_hs400(struct sdhci_host *host, struct mmc_ios *ios)
+{
+ struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+ struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
+ int ret;
+
+ if (host->clock > CORE_FREQ_100MHZ &&
+ (msm_host->tuning_done || ios->enhanced_strobe) &&
+ !msm_host->calibration_done) {
+ ret = sdhci_msm_hs400_dll_calibration(host);
+ if (!ret)
+ msm_host->calibration_done = true;
+ else
+ pr_err("%s: Failed to calibrate DLL for hs400 mode (%d)\n",
+ mmc_hostname(host->mmc), ret);
+ }
+}
+
static void sdhci_msm_set_uhs_signaling(struct sdhci_host *host,
unsigned int uhs)
{
@@ -800,12 +992,10 @@ static void sdhci_msm_set_uhs_signaling(struct sdhci_host *host,
sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
spin_unlock_irq(&host->lock);
- /* CDCLP533 HW calibration is only required for HS400 mode*/
- if (host->clock > CORE_FREQ_100MHZ &&
- msm_host->tuning_done && !msm_host->calibration_done &&
- mmc->ios.timing == MMC_TIMING_MMC_HS400)
- if (!sdhci_msm_hs400_dll_calibration(host))
- msm_host->calibration_done = true;
+
+ if (mmc->ios.timing == MMC_TIMING_MMC_HS400)
+ sdhci_msm_hs400(host, &mmc->ios);
+
spin_lock_irq(&host->lock);
}
@@ -893,9 +1083,6 @@ static void sdhci_msm_set_clock(struct sdhci_host *host, unsigned int clock)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
- struct mmc_ios curr_ios = host->mmc->ios;
- u32 config, dll_lock;
- int rc;
if (!clock) {
msm_host->clk_rate = clock;
@@ -903,117 +1090,11 @@ static void sdhci_msm_set_clock(struct sdhci_host *host, unsigned int clock)
}
spin_unlock_irq(&host->lock);
- /*
- * The SDHC requires internal clock frequency to be double the
- * actual clock that will be set for DDR mode. The controller
- * uses the faster clock(100/400MHz) for some of its parts and
- * send the actual required clock (50/200MHz) to the card.
- */
- if (curr_ios.timing == MMC_TIMING_UHS_DDR50 ||
- curr_ios.timing == MMC_TIMING_MMC_DDR52 ||
- curr_ios.timing == MMC_TIMING_MMC_HS400)
- clock *= 2;
- /*
- * In general all timing modes are controlled via UHS mode select in
- * Host Control2 register. eMMC specific HS200/HS400 doesn't have
- * their respective modes defined here, hence we use these values.
- *
- * HS200 - SDR104 (Since they both are equivalent in functionality)
- * HS400 - This involves multiple configurations
- * Initially SDR104 - when tuning is required as HS200
- * Then when switching to DDR @ 400MHz (HS400) we use
- * the vendor specific HC_SELECT_IN to control the mode.
- *
- * In addition to controlling the modes we also need to select the
- * correct input clock for DLL depending on the mode.
- *
- * HS400 - divided clock (free running MCLK/2)
- * All other modes - default (free running MCLK)
- */
- if (curr_ios.timing == MMC_TIMING_MMC_HS400) {
- /* Select the divided clock (free running MCLK/2) */
- config = readl_relaxed(host->ioaddr + CORE_VENDOR_SPEC);
- config &= ~CORE_HC_MCLK_SEL_MASK;
- config |= CORE_HC_MCLK_SEL_HS400;
- writel_relaxed(config, host->ioaddr + CORE_VENDOR_SPEC);
- /*
- * Select HS400 mode using the HC_SELECT_IN from VENDOR SPEC
- * register
- */
- if (msm_host->tuning_done && !msm_host->calibration_done) {
- /*
- * Write 0x6 to HC_SELECT_IN and 1 to HC_SELECT_IN_EN
- * field in VENDOR_SPEC_FUNC
- */
- config = readl_relaxed(host->ioaddr + CORE_VENDOR_SPEC);
- config |= CORE_HC_SELECT_IN_HS400;
- config |= CORE_HC_SELECT_IN_EN;
- writel_relaxed(config, host->ioaddr + CORE_VENDOR_SPEC);
- }
- if (!msm_host->clk_rate && !msm_host->use_cdclp533) {
- /*
- * Poll on DLL_LOCK or DDR_DLL_LOCK bits in
- * CORE_DLL_STATUS to be set. This should get set
- * within 15 us at 200 MHz.
- */
- rc = readl_relaxed_poll_timeout(host->ioaddr +
- CORE_DLL_STATUS,
- dll_lock,
- (dll_lock &
- (CORE_DLL_LOCK |
- CORE_DDR_DLL_LOCK)), 10,
- 1000);
- if (rc == -ETIMEDOUT)
- pr_err("%s: Unable to get DLL_LOCK/DDR_DLL_LOCK, dll_status: 0x%08x\n",
- mmc_hostname(host->mmc), dll_lock);
- }
- } else {
- if (!msm_host->use_cdclp533) {
- config = readl_relaxed(host->ioaddr +
- CORE_VENDOR_SPEC3);
- config &= ~CORE_PWRSAVE_DLL;
- writel_relaxed(config, host->ioaddr +
- CORE_VENDOR_SPEC3);
- }
+ sdhci_msm_hc_select_mode(host);
- config = readl_relaxed(host->ioaddr + CORE_VENDOR_SPEC);
- config &= ~CORE_HC_MCLK_SEL_MASK;
- config |= CORE_HC_MCLK_SEL_DFLT;
- writel_relaxed(config, host->ioaddr + CORE_VENDOR_SPEC);
+ msm_set_clock_rate_for_bus_mode(host, clock);
- /*
- * Disable HC_SELECT_IN to be able to use the UHS mode select
- * configuration from Host Control2 register for all other
- * modes.
- * Write 0 to HC_SELECT_IN and HC_SELECT_IN_EN field
- * in VENDOR_SPEC_FUNC
- */
- config = readl_relaxed(host->ioaddr + CORE_VENDOR_SPEC);
- config &= ~CORE_HC_SELECT_IN_EN;
- config &= ~CORE_HC_SELECT_IN_MASK;
- writel_relaxed(config, host->ioaddr + CORE_VENDOR_SPEC);
- }
-
- /*
- * Make sure above writes impacting free running MCLK are completed
- * before changing the clk_rate at GCC.
- */
- wmb();
-
- rc = clk_set_rate(msm_host->clk, clock);
- if (rc) {
- pr_err("%s: Failed to set clock at rate %u at timing %d\n",
- mmc_hostname(host->mmc), clock,
- curr_ios.timing);
- goto out_lock;
- }
- msm_host->clk_rate = clock;
- pr_debug("%s: Setting clock at rate %lu at timing %d\n",
- mmc_hostname(host->mmc), clk_get_rate(msm_host->clk),
- curr_ios.timing);
-
-out_lock:
spin_lock_irq(&host->lock);
out:
__sdhci_msm_set_clock(host, clock);
@@ -1027,7 +1108,6 @@ static const struct of_device_id sdhci_msm_dt_match[] = {
MODULE_DEVICE_TABLE(of, sdhci_msm_dt_match);
static const struct sdhci_ops sdhci_msm_ops = {
- .platform_execute_tuning = sdhci_msm_execute_tuning,
.reset = sdhci_reset,
.set_clock = sdhci_msm_set_clock,
.get_min_clock = sdhci_msm_get_min_clock,
@@ -1134,17 +1214,9 @@ static int sdhci_msm_probe(struct platform_device *pdev)
goto clk_disable;
}
- config = readl_relaxed(msm_host->core_mem + CORE_POWER);
- config |= CORE_SW_RST;
- writel_relaxed(config, msm_host->core_mem + CORE_POWER);
-
- /* SW reset can take upto 10HCLK + 15MCLK cycles. (min 40us) */
- usleep_range(1000, 5000);
- if (readl(msm_host->core_mem + CORE_POWER) & CORE_SW_RST) {
- dev_err(&pdev->dev, "Stuck in reset\n");
- ret = -ETIMEDOUT;
- goto clk_disable;
- }
+ /* Reset the vendor spec register to power on reset state */
+ writel_relaxed(CORE_VENDOR_SPEC_POR_VAL,
+ host->ioaddr + CORE_VENDOR_SPEC);
/* Set HC_MODE_EN bit in HC_MODE register */
writel_relaxed(HC_MODE_EN, (msm_host->core_mem + CORE_HC_MODE));
@@ -1210,6 +1282,7 @@ static int sdhci_msm_probe(struct platform_device *pdev)
MSM_MMC_AUTOSUSPEND_DELAY_MS);
pm_runtime_use_autosuspend(&pdev->dev);
+ host->mmc_host_ops.execute_tuning = sdhci_msm_execute_tuning;
ret = sdhci_add_host(host);
if (ret)
goto pm_runtime_disable;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.