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authorKyungmin Park <kmpark@infradead.org>2010-08-10 18:01:36 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-08-11 08:59:02 -0700
commit6da24b786ed1963a7f872c1899627968c76d17d7 (patch)
tree992e2800e6aa88218f521ddd2f1cad879dcae380 /drivers/mmc/core/mmc.c
parenta892e2d7dcdfa6c76e60c50a8c7385c65587a2a6 (diff)
mmc: recognize CSD structure
The eMMC spec 4.4 and 4.3 + additional feature chips has CSD structure version 3 and version 3 have to check the CSD_STRUCTURE byte in the EXT_CSD register. Also fix EXT_CSD revision message. [akpm@linux-foundation.org: fix comment, per Chris Ball] Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Cc: Adrian Hunter <adrian.hunter@nokia.com> Cc: Chris Ball <cjb@laptop.org> Cc: <linux-mmc@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/mmc/core/mmc.c')
-rw-r--r--drivers/mmc/core/mmc.c26
1 files changed, 19 insertions, 7 deletions
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 89f7a25b7ac..cd8d3d2ea90 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -114,17 +114,18 @@ static int mmc_decode_cid(struct mmc_card *card)
static int mmc_decode_csd(struct mmc_card *card)
{
struct mmc_csd *csd = &card->csd;
- unsigned int e, m, csd_struct;
+ unsigned int e, m;
u32 *resp = card->raw_csd;
/*
* We only understand CSD structure v1.1 and v1.2.
* v1.2 has extra information in bits 15, 11 and 10.
+ * We also support eMMC v4.4 & v4.41.
*/
- csd_struct = UNSTUFF_BITS(resp, 126, 2);
- if (csd_struct != 1 && csd_struct != 2) {
+ csd->structure = UNSTUFF_BITS(resp, 126, 2);
+ if (csd->structure == 0) {
printk(KERN_ERR "%s: unrecognised CSD structure version %d\n",
- mmc_hostname(card->host), csd_struct);
+ mmc_hostname(card->host), csd->structure);
return -EINVAL;
}
@@ -207,11 +208,22 @@ static int mmc_read_ext_csd(struct mmc_card *card)
goto out;
}
+ /* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */
+ if (card->csd.structure == 3) {
+ int ext_csd_struct = ext_csd[EXT_CSD_STRUCTURE];
+ if (ext_csd_struct > 2) {
+ printk(KERN_ERR "%s: unrecognised EXT_CSD structure "
+ "version %d\n", mmc_hostname(card->host),
+ ext_csd_struct);
+ err = -EINVAL;
+ goto out;
+ }
+ }
+
card->ext_csd.rev = ext_csd[EXT_CSD_REV];
if (card->ext_csd.rev > 5) {
- printk(KERN_ERR "%s: unrecognised EXT_CSD structure "
- "version %d\n", mmc_hostname(card->host),
- card->ext_csd.rev);
+ printk(KERN_ERR "%s: unrecognised EXT_CSD revision %d\n",
+ mmc_hostname(card->host), card->ext_csd.rev);
err = -EINVAL;
goto out;
}