From: Ohad Ben-Cohen <o...@wizery.com>
Normally writes to SDIO function 0 outside the vendor specific CCCR
registers are prohibited.
To support embedded devices that require writes to SDIO function 0 outside
this range (e.g. TI WL127x embedded sdio wifi device),
MMC_QUIRK_LENIENT_FN0 is introduced.
A card quirks field is added to `struct mmc_card' to support non-standard
devices (e.g. embedded sdio devices).
[a...@linux-foundation.org: code in C, not cpp!]
Signed-off-by: Ohad Ben-Cohen <o...@wizery.com>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <a...@linux-foundation.org>
---
drivers/mmc/core/sdio_io.c | 2 +-
include/linux/mmc/card.h | 7 +++++++
2 files changed, 8 insertions(+), 1 deletion(-)
diff -puN drivers/mmc/core/sdio_io.c~sdio-add-mmc_quirk_lenient_fn0
drivers/mmc/core/sdio_io.c
--- a/drivers/mmc/core/sdio_io.c~sdio-add-mmc_quirk_lenient_fn0
+++ a/drivers/mmc/core/sdio_io.c
@@ -624,7 +624,7 @@ void sdio_f0_writeb(struct sdio_func *fu
BUG_ON(!func);
- if (addr < 0xF0 || addr > 0xFF) {
+ if ((addr < 0xF0 || addr > 0xFF) &&
(!mmc_card_lenient_fn0(func->card))) {
if (err_ret)
*err_ret = -EINVAL;
return;
diff -puN include/linux/mmc/card.h~sdio-add-mmc_quirk_lenient_fn0
include/linux/mmc/card.h
--- a/include/linux/mmc/card.h~sdio-add-mmc_quirk_lenient_fn0
+++ a/include/linux/mmc/card.h
@@ -97,6 +97,8 @@ struct mmc_card {
#define MMC_STATE_READONLY (1<<1) /* card is read-only */
#define MMC_STATE_HIGHSPEED (1<<2) /* card is in high speed mode */
#define MMC_STATE_BLOCKADDR (1<<3) /* card uses block-addressing */
+ unsigned int quirks; /* card quirks */
+#define MMC_QUIRK_LENIENT_FN0 (1<<0) /* allow SDIO FN0 writes
outside of the VS CCCR range */
u32 raw_cid[4]; /* raw card CID */
u32 raw_csd[4]; /* raw card CSD */
@@ -132,6 +134,11 @@ struct mmc_card {
#define mmc_card_set_highspeed(c) ((c)->state |= MMC_STATE_HIGHSPEED)
#define mmc_card_set_blockaddr(c) ((c)->state |= MMC_STATE_BLOCKADDR)
+static inline int mmc_card_lenient_fn0(const struct mmc_card *c)
+{
+ return c->quirks & MMC_QUIRK_LENIENT_FN0;
+}
+
#define mmc_card_name(c) ((c)->cid.prod_name)
#define mmc_card_id(c) (dev_name(&(c)->dev))
_
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