mmc: sd: add support for uhs bus speed mode selection

This patch adds support for setting UHS-I bus speed mode during UHS-I
initialization procedure. Since both the host and card can support
more than one bus speed, we select the highest speed based on both of
their capabilities. First we set the bus speed mode for the card using
CMD6 mode 1, and then we program the host controller to support the
required speed mode. We also set High Speed Enable in case one of the
UHS-I modes is selected. We take care to reset SD clock before setting
UHS mode in the Host Control2 register, and then re-enable it as per
the Host Controller spec v3.00. We then set the clock frequency for
the UHS-I mode selected.

Tested by Zhangfei Gao with a Toshiba uhs card and general hs card,
on mmp2 in SDMA mode.

Signed-off-by: Arindam Nath <arindam.nath@amd.com>
Reviewed-by: Philip Rakity <prakity@marvell.com>
Tested-by: Philip Rakity <prakity@marvell.com>
Acked-by: Zhangfei Gao <zhangfei.gao@marvell.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

3 files changed, 108 insertions, 3 deletions

diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index 5b7c99855635..6970b82171f7 100644
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -452,6 +452,66 @@ static int sd_select_driver_type(struct mmc_card *card, u8 *status)
         return 0;
 }
 
+static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status)
+{
+        unsigned int bus_speed = 0, timing = 0;
+        int err;
+
+        /*
+         * If the host doesn't support any of the UHS-I modes, fallback on
+         * default speed.
+         */
+        if (!(card->host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
+            MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50)))
+                return 0;
+
+        if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
+            (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
+                        bus_speed = UHS_SDR104_BUS_SPEED;
+                        timing = MMC_TIMING_UHS_SDR104;
+                        card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
+        } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
+                   (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
+                        bus_speed = UHS_DDR50_BUS_SPEED;
+                        timing = MMC_TIMING_UHS_DDR50;
+                        card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
+        } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
+                    MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
+                    SD_MODE_UHS_SDR50)) {
+                        bus_speed = UHS_SDR50_BUS_SPEED;
+                        timing = MMC_TIMING_UHS_SDR50;
+                        card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
+        } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
+                    MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
+                   (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
+                        bus_speed = UHS_SDR25_BUS_SPEED;
+                        timing = MMC_TIMING_UHS_SDR25;
+                        card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
+        } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
+                    MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
+                    MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
+                    SD_MODE_UHS_SDR12)) {
+                        bus_speed = UHS_SDR12_BUS_SPEED;
+                        timing = MMC_TIMING_UHS_SDR12;
+                        card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
+        }
+
+        card->sd_bus_speed = bus_speed;
+        err = mmc_sd_switch(card, 1, 0, bus_speed, status);
+        if (err)
+                return err;
+
+        if ((status[16] & 0xF) != bus_speed)
+                printk(KERN_WARNING "%s: Problem setting bus speed mode!\n",
+                        mmc_hostname(card->host));
+        else {
+                mmc_set_timing(card->host, timing);
+                mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
+        }
+
+        return 0;
+}
+
 /*
  * UHS-I specific initialization procedure
  */
@@ -485,6 +545,11 @@ static int mmc_sd_init_uhs_card(struct mmc_card *card)
 
         /* Set the driver strength for the card */
         err = sd_select_driver_type(card, status);
+        if (err)
+                goto out;
+
+        /* Set bus speed mode of the card */
+        err = sd_set_bus_speed_mode(card, status);
 
 out:
         kfree(status);
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 409cde5970ae..8994493dd940 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1244,7 +1244,16 @@ static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
                 ctrl &= ~SDHCI_CTRL_HISPD;
 
         if (host->version >= SDHCI_SPEC_300) {
-                u16 ctrl_2;
+                u16 clk, ctrl_2;
+                unsigned int clock;
+
+                /* In case of UHS-I modes, set High Speed Enable */
+                if ((ios->timing == MMC_TIMING_UHS_SDR50) ||
+                    (ios->timing == MMC_TIMING_UHS_SDR104) ||
+                    (ios->timing == MMC_TIMING_UHS_DDR50) ||
+                    (ios->timing == MMC_TIMING_UHS_SDR25) ||
+                    (ios->timing == MMC_TIMING_UHS_SDR12))
+                        ctrl |= SDHCI_CTRL_HISPD;
 
                 ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
                 if (!(ctrl_2 & SDHCI_CTRL_PRESET_VAL_ENABLE)) {
@@ -1267,8 +1276,6 @@ static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
                          * need to reset SD Clock Enable before changing High
                          * Speed Enable to avoid generating clock gliches.
                          */
-                        u16 clk;
-                        unsigned int clock;
 
                         /* Reset SD Clock Enable */
                         clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
@@ -1282,6 +1289,33 @@ static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
                         host->clock = 0;
                         sdhci_set_clock(host, clock);
                 }
+
+                ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+
+                /* Select Bus Speed Mode for host */
+                ctrl_2 &= ~SDHCI_CTRL_UHS_MASK;
+                if (ios->timing == MMC_TIMING_UHS_SDR12)
+                        ctrl_2 |= SDHCI_CTRL_UHS_SDR12;
+                else if (ios->timing == MMC_TIMING_UHS_SDR25)
+                        ctrl_2 |= SDHCI_CTRL_UHS_SDR25;
+                else if (ios->timing == MMC_TIMING_UHS_SDR50)
+                        ctrl_2 |= SDHCI_CTRL_UHS_SDR50;
+                else if (ios->timing == MMC_TIMING_UHS_SDR104)
+                        ctrl_2 |= SDHCI_CTRL_UHS_SDR104;
+                else if (ios->timing == MMC_TIMING_UHS_DDR50)
+                        ctrl_2 |= SDHCI_CTRL_UHS_DDR50;
+
+                /* Reset SD Clock Enable */
+                clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
+                clk &= ~SDHCI_CLOCK_CARD_EN;
+                sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
+
+                sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
+
+                /* Re-enable SD Clock */
+                clock = host->clock;
+                host->clock = 0;
+                sdhci_set_clock(host, clock);
         } else
                 sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
 
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 667bf8874be7..d96f6afcca1f 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -149,6 +149,12 @@
 #define SDHCI_ACMD12_ERR        0x3C
 
 #define SDHCI_HOST_CONTROL2             0x3E
+#define  SDHCI_CTRL_UHS_MASK            0x0007
+#define   SDHCI_CTRL_UHS_SDR12          0x0000
+#define   SDHCI_CTRL_UHS_SDR25          0x0001
+#define   SDHCI_CTRL_UHS_SDR50          0x0002
+#define   SDHCI_CTRL_UHS_SDR104         0x0003
+#define   SDHCI_CTRL_UHS_DDR50          0x0004
 #define  SDHCI_CTRL_VDD_180             0x0008
 #define  SDHCI_CTRL_DRV_TYPE_MASK       0x0030
 #define   SDHCI_CTRL_DRV_TYPE_B         0x0000