sdio: add MMC_QUIRK_LENIENT_FN0

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).

[akpm@linux-foundation.org: code in C, not cpp!]
Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/mmc/core/sdio_io.c b/drivers/mmc/core/sdio_io.c
index f61fc2d..f9aa8a7 100644 (file)
--- a/drivers/mmc/core/sdio_io.c
+++ b/drivers/mmc/core/sdio_io.c
@@ -624,7 +624,7 @@ void sdio_f0_writeb(struct sdio_func *func, unsigned char b, unsigned int addr,
 
        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 --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index 00db39c..2ee22e8 100644 (file)
--- a/include/linux/mmc/card.h
+++ b/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))