sdio: read and decode interesting parts of the CCCR

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

1 files changed, 63 insertions, 0 deletions

diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
index 444328581ce..7ce3e3104d2 100644
--- a/drivers/mmc/core/sdio.c
+++ b/drivers/mmc/core/sdio.c
@@ -13,6 +13,7 @@
 
 #include <linux/mmc/host.h>
 #include <linux/mmc/card.h>
+#include <linux/mmc/sdio.h>
 #include <linux/mmc/sdio_func.h>
 
 #include "core.h"
@@ -39,6 +40,61 @@ static int sdio_init_func(struct mmc_card *card, unsigned int fn)
         return 0;
 }
 
+static int sdio_read_cccr(struct mmc_card *card)
+{
+        int ret;
+        int cccr_vsn;
+        unsigned char data;
+
+        memset(&card->cccr, 0, sizeof(struct sdio_cccr));
+
+        ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
+        if (ret)
+                goto out;
+
+        cccr_vsn = data & 0x0f;
+
+        if (cccr_vsn > SDIO_CCCR_REV_1_20) {
+                printk(KERN_ERR "%s: unrecognised CCCR structure version %d\n",
+                        mmc_hostname(card->host), cccr_vsn);
+                return -EINVAL;
+        }
+
+        card->cccr.sdio_vsn = (data & 0xf0) >> 4;
+
+        ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
+        if (ret)
+                goto out;
+
+        if (data & SDIO_CCCR_CAP_SMB)
+                card->cccr.multi_block = 1;
+        if (data & SDIO_CCCR_CAP_LSC)
+                card->cccr.low_speed = 1;
+        if (data & SDIO_CCCR_CAP_4BLS)
+                card->cccr.wide_bus = 1;
+
+        if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
+                ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
+                if (ret)
+                        goto out;
+
+                if (data & SDIO_POWER_SMPC)
+                        card->cccr.high_power = 1;
+        }
+
+        if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
+                ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &data);
+                if (ret)
+                        goto out;
+
+                if (data & SDIO_SPEED_SHS)
+                        card->cccr.high_speed = 1;
+        }
+
+out:
+        return ret;
+}
+
 /*
  * Host is being removed. Free up the current card.
  */
@@ -181,6 +237,13 @@ int mmc_attach_sdio(struct mmc_host *host, u32 ocr)
                 goto remove;
 
         /*
+         * Read the common registers.
+         */
+        err = sdio_read_cccr(card);
+        if (err)
+                goto remove;
+
+        /*
          * Initialize (but don't add) all present functions.
          */
         for (i = 0;i < funcs;i++) {