summaryrefslogtreecommitdiff
path: root/drivers/mmc
diff options
context:
space:
mode:
authorPhilip Rakity <prakity@marvell.com>2011-02-14 10:13:09 +0300
committerChris Ball <cjb@laptop.org>2011-03-16 19:30:25 +0300
commitb676f0391a5f6816c047cbd1e2ad2a897f3c161a (patch)
treee054461c7796123904f57fe4969134e94c2eb8ec /drivers/mmc
parent2f94e55ae5ddad83e661002985d2ea11b6d51d3d (diff)
downloadlinux-b676f0391a5f6816c047cbd1e2ad2a897f3c161a.tar.xz
mmc: check if mmc cards < 2GB do sector addressing
Some TOSHIBA MMC cards only support sector addressing even though the size is < 2GB. According to JEDEC Spec JESD84-A441-1 the ocr register (bits 30, 29) determine byte/sector mode. Use them. Signed-off-by: Philip Rakity <prakity@marvell.com> Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/core/mmc.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 6396c5d98e85..14e95f39a7bf 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -421,6 +421,7 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
int err, ddr = 0;
u32 cid[4];
unsigned int max_dtr;
+ u32 rocr;
BUG_ON(!host);
WARN_ON(!host->claimed);
@@ -434,7 +435,7 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
mmc_go_idle(host);
/* The extra bit indicates that we support high capacity */
- err = mmc_send_op_cond(host, ocr | (1 << 30), NULL);
+ err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
if (err)
goto err;
@@ -522,6 +523,15 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
err = mmc_read_ext_csd(card);
if (err)
goto free_card;
+
+ /* If doing byte addressing, check if required to do sector
+ * addressing. Handle the case of <2GB cards needing sector
+ * addressing. See section 8.1 JEDEC Standard JED84-A441;
+ * ocr register has bit 30 set for sector addressing.
+ */
+ if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30)))
+ mmc_card_set_blockaddr(card);
+
/* Erase size depends on CSD and Extended CSD */
mmc_set_erase_size(card);
}