From: Ai Kyuse <ai.kyuse.uw@xxxxxxxxxxx>
Add eMMC HS400 support to SDHI driver.
In this mode of operation tuning uses 4 taps rather than 8 on
hardware currently supported in mainline.
Signed-off-by: Ai Kyuse <ai.kyuse.uw@xxxxxxxxxxx>
Signed-off-by: Masaharu Hayakawa <masaharu.hayakawa.ry@xxxxxxxxxxx>
Signed-off-by: Simon Horman <horms+renesas@xxxxxxxxxxxx>
---
v1 [Simon Horman]
- Combined patched by Ai Kyuse and Masaharu Hayakawa
- Rebase
v0 [Ai Kyuse]
---
drivers/mmc/host/renesas_sdhi_core.c | 123 ++++++++++++++++++++++++++++++-----
1 file changed, 107 insertions(+), 16 deletions(-)
diff --git a/drivers/mmc/host/renesas_sdhi_core.c b/drivers/mmc/host/renesas_sdhi_core.c
index fcf7235d5742..73b963e506ab 100644
--- a/drivers/mmc/host/renesas_sdhi_core.c
+++ b/drivers/mmc/host/renesas_sdhi_core.c
@@ -223,6 +223,7 @@ static int renesas_sdhi_start_signal_voltage_switch(struct mmc_host *mmc,
#define SH_MOBILE_SDHI_SCC_CKSEL 0x006
#define SH_MOBILE_SDHI_SCC_RVSCNTL 0x008
#define SH_MOBILE_SDHI_SCC_RVSREQ 0x00A
+#define SH_MOBILE_SDHI_SCC_TMPPORT2 0x00E
/* Definitions for values the SH_MOBILE_SDHI_SCC_DTCNTL register */
#define SH_MOBILE_SDHI_SCC_DTCNTL_TAPEN BIT(0)
@@ -235,6 +236,9 @@ static int renesas_sdhi_start_signal_voltage_switch(struct mmc_host *mmc,
#define SH_MOBILE_SDHI_SCC_RVSCNTL_RVSEN BIT(0)
/* Definitions for values the SH_MOBILE_SDHI_SCC_RVSREQ register */
#define SH_MOBILE_SDHI_SCC_RVSREQ_RVSERR BIT(2)
+/* Definitions for values the SH_MOBILE_SDHI_SCC_TMPPORT2 register */
+#define SH_MOBILE_SDHI_SCC_TMPPORT2_HS400EN BIT(31)
+#define SH_MOBILE_SDHI_SCC_TMPPORT2_HS400OSEL BIT(4)
static inline u32 sd_scc_read32(struct tmio_mmc_host *host,
struct renesas_sdhi *priv, int addr)
@@ -249,39 +253,57 @@ static inline void sd_scc_write32(struct tmio_mmc_host *host,
writel(val, priv->scc_ctl + (addr << host->bus_shift));
}
+
+static void renesas_sdhi_disable_scc(struct mmc_host *mmc)
+{
+ struct tmio_mmc_host *host = mmc_priv(mmc);
+ struct renesas_sdhi *priv = host_to_priv(host);
+
+ sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN &
+ sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
+
+ sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_CKSEL,
+ ~SH_MOBILE_SDHI_SCC_CKSEL_DTSEL &
+ sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_CKSEL));
+
+ sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_DTCNTL,
+ ~SH_MOBILE_SDHI_SCC_DTCNTL_TAPEN &
+ sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_DTCNTL));
+
+ sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN |
+ sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
+}
+
static unsigned int renesas_sdhi_init_tuning(struct tmio_mmc_host *host)
{
struct renesas_sdhi *priv;
priv = host_to_priv(host);
- /* set sampling clock selection range */
- sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_DTCNTL,
- 0x8 << SH_MOBILE_SDHI_SCC_DTCNTL_TAPNUM_SHIFT);
-
/* Initialize SCC */
sd_ctrl_write32_as_16_and_16(host, CTL_STATUS, 0x0);
- sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_DTCNTL,
- SH_MOBILE_SDHI_SCC_DTCNTL_TAPEN |
- sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_DTCNTL));
-
sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN &
sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
+ /* set sampling clock selection range */
+ sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_DTCNTL,
+ SH_MOBILE_SDHI_SCC_DTCNTL_TAPEN |
+ 0x8 << SH_MOBILE_SDHI_SCC_DTCNTL_TAPNUM_SHIFT);
+
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_CKSEL,
SH_MOBILE_SDHI_SCC_CKSEL_DTSEL |
sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_CKSEL));
- sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN |
- sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
-
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL,
~SH_MOBILE_SDHI_SCC_RVSCNTL_RVSEN &
sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL));
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_DT2FF, host->scc_tappos);
+ sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN |
+ sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
+
/* Read TAPNUM */
return (sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_DTCNTL) >>
SH_MOBILE_SDHI_SCC_DTCNTL_TAPNUM_SHIFT) &
@@ -297,13 +319,69 @@ static void renesas_sdhi_prepare_tuning(struct tmio_mmc_host *host,
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TAPSET, tap);
}
+static void renesas_sdhi_prepare_hs400_tuning(struct mmc_host *mmc,
+ struct mmc_ios *ios)
+{
+ struct tmio_mmc_host *host = mmc_priv(mmc);
+ struct renesas_sdhi *priv = host_to_priv(host);
+
+ sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN &
+ sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
+
+ /* Set HS400 mode */
+ sd_ctrl_write16(host, CTL_SDIF_MODE, 0x0001 |
+ sd_ctrl_read16(host, CTL_SDIF_MODE));
+ sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT2,
+ SH_MOBILE_SDHI_SCC_TMPPORT2_HS400EN |
+ SH_MOBILE_SDHI_SCC_TMPPORT2_HS400OSEL |
+ sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT2));
+
+
+ /* HS400 mode sets sampling clock selection range to 4 */
+ sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_DTCNTL,
+ SH_MOBILE_SDHI_SCC_DTCNTL_TAPEN |
+ 0x4 << SH_MOBILE_SDHI_SCC_DTCNTL_TAPNUM_SHIFT);
+
+ sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TAPSET,
+ host->tap_set / 2);
+
+ sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_CKSEL,
+ SH_MOBILE_SDHI_SCC_CKSEL_DTSEL |
+ sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_CKSEL));
+
+ sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN |
+ sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
+}
+
+static void renesas_sdhi_reset_hs400_mode(struct mmc_host *mmc)
+{
+ struct tmio_mmc_host *host = mmc_priv(mmc);
+ struct renesas_sdhi *priv = host_to_priv(host);
+
+ if (!priv->scc_ctl)
+ return;
+
+ sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN &
+ sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
+
+ /* Reset HS400 mode */
+ sd_ctrl_write16(host, CTL_SDIF_MODE, ~0x0001 &
+ sd_ctrl_read16(host, CTL_SDIF_MODE));
+ sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT2,
+ ~(SH_MOBILE_SDHI_SCC_TMPPORT2_HS400EN |
+ SH_MOBILE_SDHI_SCC_TMPPORT2_HS400OSEL) &
+ sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT2));
+
+ sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN |
+ sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
+}
+
#define SH_MOBILE_SDHI_MAX_TAP 3
static int renesas_sdhi_select_tuning(struct tmio_mmc_host *host)
{
struct renesas_sdhi *priv = host_to_priv(host);
unsigned long tap_cnt; /* counter of tuning success */
- unsigned long tap_set; /* tap position */
unsigned long tap_start;/* start position of tuning success */
unsigned long tap_end; /* end position of tuning success */
unsigned long ntap; /* temporary counter of tuning success */
@@ -341,12 +419,12 @@ static int renesas_sdhi_select_tuning(struct tmio_mmc_host *host)
}
if (tap_cnt >= SH_MOBILE_SDHI_MAX_TAP)
- tap_set = (tap_start + tap_end) / 2 % host->tap_num;
+ host->tap_set = (tap_start + tap_end) / 2 % host->tap_num;
else
return -EIO;
/* Set SCC */
- sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TAPSET, tap_set);
+ sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TAPSET, host->tap_set);
/* Enable auto re-tuning */
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL,
@@ -387,6 +465,14 @@ static void renesas_sdhi_hw_reset(struct tmio_mmc_host *host)
~SH_MOBILE_SDHI_SCC_CKSEL_DTSEL &
sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_CKSEL));
+ /* Reset HS400 mode */
+ sd_ctrl_write16(host, CTL_SDIF_MODE, ~0x0001 &
+ sd_ctrl_read16(host, CTL_SDIF_MODE));
+ sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT2,
+ ~(SH_MOBILE_SDHI_SCC_TMPPORT2_HS400EN |
+ SH_MOBILE_SDHI_SCC_TMPPORT2_HS400OSEL) &
+ sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT2));
+
sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN |
sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
@@ -597,7 +683,8 @@ int renesas_sdhi_probe(struct platform_device *pdev,
/* Enable tuning iff we have an SCC and a supported mode */
if (of_data && of_data->scc_offset &&
(host->mmc->caps & MMC_CAP_UHS_SDR104 ||
- host->mmc->caps2 & MMC_CAP2_HS200_1_8V_SDR)) {
+ host->mmc->caps2 & (MMC_CAP2_HS200_1_8V_SDR |
+ MMC_CAP2_HS400_1_8V))) {
const struct renesas_sdhi_scc *taps = of_data->taps;
bool hit = false;
@@ -619,8 +706,12 @@ int renesas_sdhi_probe(struct platform_device *pdev,
host->init_tuning = renesas_sdhi_init_tuning;
host->prepare_tuning = renesas_sdhi_prepare_tuning;
host->select_tuning = renesas_sdhi_select_tuning;
- host->check_scc_error = renesas_sdhi_check_scc_error;
+ if (!(host->mmc->caps2 & MMC_CAP2_HS400_1_8V))
+ host->check_scc_error = renesas_sdhi_check_scc_error;
host->hw_reset = renesas_sdhi_hw_reset;
+ host->disable_scc = renesas_sdhi_disable_scc;
+ host->prepare_hs400_tuning = renesas_sdhi_prepare_hs400_tuning;
+ host->reset_hs400_mode = renesas_sdhi_reset_hs400_mode;
}
i = 0;
--
2.11.0
