mmci: Add support for ST Micro derivate

This patch adds support for the ST Microelectronics version of
the PL180 PrimeCell. They use designer ID 0x80 and have a few
alterations/bugfixes related to open drain and HW flow control.
They also add some SDIO registers, I am unsure if these are
in ST HW only or if this is things also added in later ARM
revisions, but they are included in the mmci.h file for
completeness.

Signed-off-by: Linus Walleij <linus.walleij@ericsson.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

2 files changed, 61 insertions, 4 deletions

diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 1bcbdd6763ac..2909bbc8ad00 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -430,6 +430,8 @@ static void mmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
                                 clk = 255;
                         host->cclk = host->mclk / (2 * (clk + 1));
                 }
+                if (host->hw_designer == 0x80)
+                        clk |= MCI_FCEN; /* Bug fix in ST IP block */
                 clk |= MCI_CLK_ENABLE;
         }
 
@@ -440,15 +442,27 @@ static void mmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
         case MMC_POWER_OFF:
                 break;
         case MMC_POWER_UP:
-                pwr |= MCI_PWR_UP;
-                break;
+                /* The ST version does not have this, fall through to POWER_ON */
+                if (host->hw_designer != 0x80) {
+                        pwr |= MCI_PWR_UP;
+                        break;
+                }
         case MMC_POWER_ON:
                 pwr |= MCI_PWR_ON;
                 break;
         }
 
-        if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
-                pwr |= MCI_ROD;
+        if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN) {
+                if (host->hw_designer != 0x80)
+                        pwr |= MCI_ROD;
+                else {
+                        /*
+                         * The ST Micro variant use the ROD bit for something
+                         * else and only has OD (Open Drain).
+                         */
+                        pwr |= MCI_OD;
+                }
+        }
 
         writel(clk, host->base + MMCICLOCK);
 
@@ -500,6 +514,12 @@ static int mmci_probe(struct amba_device *dev, void *id)
         }
 
         host = mmc_priv(mmc);
+        /* Bits 12 thru 19 is the designer */
+        host->hw_designer = (dev->periphid >> 12) & 0xff;
+        /* Bits 20 thru 23 is the revison */
+        host->hw_revision = (dev->periphid >> 20) & 0xf;
+        DBG(host, "designer ID = 0x%02x\n", host->hw_designer);
+        DBG(host, "revision = 0x%01x\n", host->hw_revision);
         host->clk = clk_get(&dev->dev, NULL);
         if (IS_ERR(host->clk)) {
                 ret = PTR_ERR(host->clk);
@@ -693,6 +713,15 @@ static struct amba_id mmci_ids[] = {
                 .id     = 0x00041181,
                 .mask   = 0x000fffff,
         },
+        /* ST Micro variants */
+        {
+                .id     = 0x00180180,
+                .mask   = 0x00ffffff,
+        },
+        {
+                .id     = 0x00280180,
+                .mask   = 0x00ffffff,
+        },
         { 0, 0 },
 };
 
diff --git a/drivers/mmc/host/mmci.h b/drivers/mmc/host/mmci.h
index 0f39c490f022..0441bac1c0ec 100644
--- a/drivers/mmc/host/mmci.h
+++ b/drivers/mmc/host/mmci.h
@@ -11,13 +11,23 @@
 #define MCI_PWR_OFF             0x00
 #define MCI_PWR_UP              0x02
 #define MCI_PWR_ON              0x03
+#define MCI_DATA2DIREN          (1 << 2)
+#define MCI_CMDDIREN            (1 << 3)
+#define MCI_DATA0DIREN          (1 << 4)
+#define MCI_DATA31DIREN         (1 << 5)
 #define MCI_OD                  (1 << 6)
 #define MCI_ROD                 (1 << 7)
+/* The ST Micro version does not have ROD */
+#define MCI_FBCLKEN             (1 << 7)
+#define MCI_DATA74DIREN         (1 << 8)
 
 #define MMCICLOCK               0x004
 #define MCI_CLK_ENABLE          (1 << 8)
 #define MCI_CLK_PWRSAVE         (1 << 9)
 #define MCI_CLK_BYPASS          (1 << 10)
+#define MCI_WIDE_BUS            (1 << 11)
+/* HW flow control on the ST Micro version */
+#define MCI_FCEN                (1 << 13)
 
 #define MMCIARGUMENT            0x008
 #define MMCICOMMAND             0x00c
@@ -26,6 +36,10 @@
 #define MCI_CPSM_INTERRUPT      (1 << 8)
 #define MCI_CPSM_PENDING        (1 << 9)
 #define MCI_CPSM_ENABLE         (1 << 10)
+#define MCI_SDIO_SUSP           (1 << 11)
+#define MCI_ENCMD_COMPL         (1 << 12)
+#define MCI_NIEN                (1 << 13)
+#define MCI_CE_ATACMD           (1 << 14)
 
 #define MMCIRESPCMD             0x010
 #define MMCIRESPONSE0           0x014
@@ -39,6 +53,11 @@
 #define MCI_DPSM_DIRECTION      (1 << 1)
 #define MCI_DPSM_MODE           (1 << 2)
 #define MCI_DPSM_DMAENABLE      (1 << 3)
+#define MCI_DPSM_BLOCKSIZE      (1 << 4)
+#define MCI_DPSM_RWSTART        (1 << 8)
+#define MCI_DPSM_RWSTOP         (1 << 9)
+#define MCI_DPSM_RWMOD          (1 << 10)
+#define MCI_DPSM_SDIOEN         (1 << 11)
 
 #define MMCIDATACNT             0x030
 #define MMCISTATUS              0x034
@@ -63,6 +82,8 @@
 #define MCI_RXFIFOEMPTY         (1 << 19)
 #define MCI_TXDATAAVLBL         (1 << 20)
 #define MCI_RXDATAAVLBL         (1 << 21)
+#define MCI_SDIOIT              (1 << 22)
+#define MCI_CEATAEND            (1 << 23)
 
 #define MMCICLEAR               0x038
 #define MCI_CMDCRCFAILCLR       (1 << 0)
@@ -75,6 +96,8 @@
 #define MCI_CMDSENTCLR          (1 << 7)
 #define MCI_DATAENDCLR          (1 << 8)
 #define MCI_DATABLOCKENDCLR     (1 << 10)
+#define MCI_SDIOITC             (1 << 22)
+#define MCI_CEATAENDC           (1 << 23)
 
 #define MMCIMASK0               0x03c
 #define MCI_CMDCRCFAILMASK      (1 << 0)
@@ -98,6 +121,8 @@
 #define MCI_RXFIFOEMPTYMASK     (1 << 19)
 #define MCI_TXDATAAVLBLMASK     (1 << 20)
 #define MCI_RXDATAAVLBLMASK     (1 << 21)
+#define MCI_SDIOITMASK          (1 << 22)
+#define MCI_CEATAENDMASK        (1 << 23)
 
 #define MMCIMASK1               0x040
 #define MMCIFIFOCNT             0x048
@@ -136,6 +161,9 @@ struct mmci_host {
         u32                     pwr;
         struct mmc_platform_data *plat;
 
+        u8                      hw_designer;
+        u8                      hw_revision:4;
+
         struct timer_list       timer;
         unsigned int            oldstat;