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authorGrazvydas Ignotas <notasas@gmail.com>2010-08-10 18:01:50 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-08-11 08:59:04 -0700
commit6f51be3d37dff73cf8db771df4169f4c2f1cbf66 (patch)
tree0d79099cab112a4bd694d2868fbd9c35fd3cdd3a /drivers/mmc
parent20b1597bcf4a76ccab232fa032f5f9ad30069167 (diff)
downloadlinux-6f51be3d37dff73cf8db771df4169f4c2f1cbf66.tar.bz2
sdio: allow non-standard SDIO cards
There are some chips (like TI WL12xx series) that can be interfaced over SDIO but don't support the SDIO specification, meaning that they are missing CIA (Common I/O Area) with all it's registers. Current Linux SDIO implementation relies on those registers to identify and configure the card, so non-standard cards can not function and cause lots of warnings from the core when it reads invalid data from non-existent registers. After this patch, init_card() host callback can now set new quirk MMC_QUIRK_NONSTD_SDIO, which means that SDIO core should not try to access any standard SDIO registers and rely on init_card() to fill all SDIO structures instead. As those cards are usually embedded chips, all the required information can be obtained from machine board files by the host driver when it's called through init_card() callback. Signed-off-by: Grazvydas Ignotas <notasas@gmail.com> Cc: Adrian Hunter <adrian.hunter@nokia.com> Cc: Tony Lindgren <tony@atomide.com> Cc: Bob Copeland <me@bobcopeland.com> Cc: Kalle Valo <kvalo@adurom.com> Cc: Madhusudhan Chikkature <madhu.cr@ti.com> Cc: Kishore Kadiyala <kishore.kadiyala@ti.com> Cc: Russell King <linux@arm.linux.org.uk> 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')
-rw-r--r--drivers/mmc/core/sdio.c36
1 files changed, 30 insertions, 6 deletions
diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
index b0b6ce93e519..bd2755e8d9a3 100644
--- a/drivers/mmc/core/sdio.c
+++ b/drivers/mmc/core/sdio.c
@@ -63,13 +63,19 @@ static int sdio_init_func(struct mmc_card *card, unsigned int fn)
func->num = fn;
- ret = sdio_read_fbr(func);
- if (ret)
- goto fail;
+ if (!(card->quirks & MMC_QUIRK_NONSTD_SDIO)) {
+ ret = sdio_read_fbr(func);
+ if (ret)
+ goto fail;
- ret = sdio_read_func_cis(func);
- if (ret)
- goto fail;
+ ret = sdio_read_func_cis(func);
+ if (ret)
+ goto fail;
+ } else {
+ func->vendor = func->card->cis.vendor;
+ func->device = func->card->cis.device;
+ func->max_blksize = func->card->cis.blksize;
+ }
card->sdio_func[fn - 1] = func;
@@ -412,6 +418,23 @@ static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
goto remove;
}
+ if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
+ /*
+ * This is non-standard SDIO device, meaning it doesn't
+ * have any CIA (Common I/O area) registers present.
+ * It's host's responsibility to fill cccr and cis
+ * structures in init_card().
+ */
+ mmc_set_clock(host, card->cis.max_dtr);
+
+ if (card->cccr.high_speed) {
+ mmc_card_set_highspeed(card);
+ mmc_set_timing(card->host, MMC_TIMING_SD_HS);
+ }
+
+ goto finish;
+ }
+
/*
* Read the common registers.
*/
@@ -480,6 +503,7 @@ static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
else if (err)
goto remove;
+finish:
if (!oldcard)
host->card = card;
return 0;