[PATCH] mmc: wbsd Secure Digital support

Add support for Secure Digital specific features in the wbsd driver.  Adds
support for read-only switch and wide bus transfers.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 57 insertions, 6 deletions

diff --git a/drivers/mmc/wbsd.c b/drivers/mmc/wbsd.c
index 08ae22aed9e8..dec01d38c782 100644
--- a/drivers/mmc/wbsd.c
+++ b/drivers/mmc/wbsd.c
@@ -720,11 +720,28 @@ static void wbsd_prepare_data(struct wbsd_host* host, struct mmc_data* data)
          * calculate CRC.
          *
          * Space for CRC must be included in the size.
+         * Two bytes are needed for each data line.
          */
-        blksize = (1 << data->blksz_bits) + 2;
+        if (host->bus_width == MMC_BUS_WIDTH_1)
+        {
+                blksize = (1 << data->blksz_bits) + 2;
+
+                wbsd_write_index(host, WBSD_IDX_PBSMSB, (blksize >> 4) & 0xF0);
+                wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF);
+        }
+        else if (host->bus_width == MMC_BUS_WIDTH_4)
+        {
+                blksize = (1 << data->blksz_bits) + 2 * 4;
         
-        wbsd_write_index(host, WBSD_IDX_PBSMSB, (blksize >> 4) & 0xF0);
-        wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF);
+                wbsd_write_index(host, WBSD_IDX_PBSMSB, ((blksize >> 4) & 0xF0)
+                        | WBSD_DATA_WIDTH);
+                wbsd_write_index(host, WBSD_IDX_PBSLSB, blksize & 0xFF);
+        }
+        else
+        {
+                data->error = MMC_ERR_INVALID;
+                return;
+        }
 
         /*
          * Clear the FIFO. This is needed even for DMA
@@ -960,9 +977,9 @@ static void wbsd_set_ios(struct mmc_host* mmc, struct mmc_ios* ios)
         struct wbsd_host* host = mmc_priv(mmc);
         u8 clk, setup, pwr;
         
-        DBGF("clock %uHz busmode %u powermode %u cs %u Vdd %u\n",
-                ios->clock, ios->bus_mode, ios->power_mode, ios->chip_select,
-                ios->vdd);
+        DBGF("clock %uHz busmode %u powermode %u cs %u Vdd %u width %u\n",
+             ios->clock, ios->bus_mode, ios->power_mode, ios->chip_select,
+             ios->vdd, ios->bus_width);
 
         spin_lock_bh(&host->lock);
 
@@ -1010,6 +1027,7 @@ static void wbsd_set_ios(struct mmc_host* mmc, struct mmc_ios* ios)
         setup = wbsd_read_index(host, WBSD_IDX_SETUP);
         if (ios->chip_select == MMC_CS_HIGH)
         {
+                BUG_ON(ios->bus_width != MMC_BUS_WIDTH_1);
                 setup |= WBSD_DAT3_H;
                 host->flags |= WBSD_FIGNORE_DETECT;
         }
@@ -1025,12 +1043,41 @@ static void wbsd_set_ios(struct mmc_host* mmc, struct mmc_ios* ios)
         }
         wbsd_write_index(host, WBSD_IDX_SETUP, setup);
         
+        /*
+         * Store bus width for later. Will be used when
+         * setting up the data transfer.
+         */
+        host->bus_width = ios->bus_width;
+
         spin_unlock_bh(&host->lock);
 }
 
+static int wbsd_get_ro(struct mmc_host* mmc)
+{
+        struct wbsd_host* host = mmc_priv(mmc);
+        u8 csr;
+
+        spin_lock_bh(&host->lock);
+
+        csr = inb(host->base + WBSD_CSR);
+        csr |= WBSD_MSLED;
+        outb(csr, host->base + WBSD_CSR);
+
+        mdelay(1);
+
+        csr = inb(host->base + WBSD_CSR);
+        csr &= ~WBSD_MSLED;
+        outb(csr, host->base + WBSD_CSR);
+
+        spin_unlock_bh(&host->lock);
+
+        return csr & WBSD_WRPT;
+}
+
 static struct mmc_host_ops wbsd_ops = {
         .request        = wbsd_request,
         .set_ios        = wbsd_set_ios,
+        .get_ro         = wbsd_get_ro,
 };
 
 /*****************************************************************************\
@@ -1355,6 +1402,7 @@ static int __devinit wbsd_alloc_mmc(struct device* dev)
         mmc->f_min = 375000;
         mmc->f_max = 24000000;
         mmc->ocr_avail = MMC_VDD_32_33|MMC_VDD_33_34;
+        mmc->caps = MMC_CAP_4_BIT_DATA;
         
         spin_lock_init(&host->lock);
         
diff --git a/drivers/mmc/wbsd.h b/drivers/mmc/wbsd.h
index 8af43549f5d5..9005b5241b3c 100644
--- a/drivers/mmc/wbsd.h
+++ b/drivers/mmc/wbsd.h
@@ -106,6 +106,8 @@
 #define WBSD_CLK_16M            0x02
 #define WBSD_CLK_24M            0x03
 
+#define WBSD_DATA_WIDTH         0x01
+
 #define WBSD_DAT3_H             0x08
 #define WBSD_FIFO_RESET         0x04
 #define WBSD_SOFT_RESET         0x02
@@ -164,6 +166,7 @@ struct wbsd_host
         int                     firsterr;       /* See fifo functions */
         
         u8                      clk;            /* Current clock speed */
+        unsigned char           bus_width;      /* Current bus width */
         
         int                     config;         /* Config port */
         u8                      unlock_code;    /* Code to unlock config */