mmc: MMC sector based cards

Support for MMC 4.2 sector based cards. This tweaks the init a
bit and reads a new field out of the EXT_CSD.

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

1 files changed, 22 insertions, 3 deletions

diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index 2ba46273496b..f772df93a398 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -1106,11 +1106,29 @@ static void mmc_process_ext_csds(struct mmc_host *host)
                 mmc_wait_for_req(host, &mrq);
 
                 if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE) {
-                        printk("%s: unable to read EXT_CSD, performance "
-                                "might suffer.\n", mmc_hostname(card->host));
+                        if (card->csd.capacity == (4096 * 512)) {
+                                printk(KERN_ERR "%s: unable to read EXT_CSD "
+                                        "on a possible high capacity card. "
+                                        "Card will be ignored.\n",
+                                        mmc_hostname(card->host));
+                                mmc_card_set_dead(card);
+                        } else {
+                                printk(KERN_WARNING "%s: unable to read "
+                                        "EXT_CSD, performance might "
+                                        "suffer.\n",
+                                        mmc_hostname(card->host));
+                        }
                         continue;
                 }
 
+                card->ext_csd.sectors =
+                        ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
+                        ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
+                        ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
+                        ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
+                if (card->ext_csd.sectors)
+                        mmc_card_set_blockaddr(card);
+
                 switch (ext_csd[EXT_CSD_CARD_TYPE]) {
                 case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
                         card->ext_csd.hs_max_dtr = 52000000;
@@ -1499,7 +1517,8 @@ static void mmc_setup(struct mmc_host *host)
                         mmc_send_app_op_cond(host, host->ocr | (sd2 << 30), NULL);
                 }
         } else {
-                mmc_send_op_cond(host, host->ocr, NULL);
+                /* The extra bit indicates that we support high capacity */
+                mmc_send_op_cond(host, host->ocr | (1 << 30), NULL);
         }
 
         mmc_discover_cards(host);