The patch titled
sdio: recognize io card without powercycle
has been added to the -mm tree. Its filename is
sdio-recognize-io-card-without-powercycle.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find
out what to do about this
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: sdio: recognize io card without powercycle
From: Albert Herranz <albert_herranz@xxxxxxxx>
SDIO Simplified Specification V2.00 states that it is strongly recommended
that the host executes either a power reset or issues a CMD52 (I/O Reset)
to re-initialize an I/O only card or the I/O portion of a combo card.
Additionally, the CMD52 must be issued first because it cannot be issued
after a CMD0.
With this patch the Nintendo Wii SDIO-based WLAN card is detected after a
system reset, without requiring a complete system powercycle.
Signed-off-by: Albert Herranz <albert_herranz@xxxxxxxx>
Cc: <linux-mmc@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/mmc/core/core.c | 1
drivers/mmc/core/sdio_ops.c | 36 ++++++++++++++++++++++++++++------
drivers/mmc/core/sdio_ops.h | 1
3 files changed, 32 insertions(+), 6 deletions(-)
diff -puN drivers/mmc/core/core.c~sdio-recognize-io-card-without-powercycle drivers/mmc/core/core.c
--- a/drivers/mmc/core/core.c~sdio-recognize-io-card-without-powercycle
+++ a/drivers/mmc/core/core.c
@@ -1073,6 +1073,7 @@ void mmc_rescan(struct work_struct *work
mmc_claim_host(host);
mmc_power_up(host);
+ sdio_reset(host);
mmc_go_idle(host);
mmc_send_if_cond(host, host->ocr_avail);
diff -puN drivers/mmc/core/sdio_ops.c~sdio-recognize-io-card-without-powercycle drivers/mmc/core/sdio_ops.c
--- a/drivers/mmc/core/sdio_ops.c~sdio-recognize-io-card-without-powercycle
+++ a/drivers/mmc/core/sdio_ops.c
@@ -67,13 +67,13 @@ int mmc_send_io_op_cond(struct mmc_host
return err;
}
-int mmc_io_rw_direct(struct mmc_card *card, int write, unsigned fn,
- unsigned addr, u8 in, u8* out)
+static int mmc_io_rw_direct_host(struct mmc_host *host, int write, unsigned fn,
+ unsigned addr, u8 in, u8 *out)
{
struct mmc_command cmd;
int err;
- BUG_ON(!card);
+ BUG_ON(!host);
BUG_ON(fn > 7);
/* sanity check */
@@ -90,11 +90,11 @@ int mmc_io_rw_direct(struct mmc_card *ca
cmd.arg |= in;
cmd.flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_AC;
- err = mmc_wait_for_cmd(card->host, &cmd, 0);
+ err = mmc_wait_for_cmd(host, &cmd, 0);
if (err)
return err;
- if (mmc_host_is_spi(card->host)) {
+ if (mmc_host_is_spi(host)) {
/* host driver already reported errors */
} else {
if (cmd.resp[0] & R5_ERROR)
@@ -106,7 +106,7 @@ int mmc_io_rw_direct(struct mmc_card *ca
}
if (out) {
- if (mmc_host_is_spi(card->host))
+ if (mmc_host_is_spi(host))
*out = (cmd.resp[0] >> 8) & 0xFF;
else
*out = cmd.resp[0] & 0xFF;
@@ -115,6 +115,13 @@ int mmc_io_rw_direct(struct mmc_card *ca
return 0;
}
+int mmc_io_rw_direct(struct mmc_card *card, int write, unsigned fn,
+ unsigned addr, u8 in, u8 *out)
+{
+ BUG_ON(!card);
+ return mmc_io_rw_direct_host(card->host, write, fn, addr, in, out);
+}
+
int mmc_io_rw_extended(struct mmc_card *card, int write, unsigned fn,
unsigned addr, int incr_addr, u8 *buf, unsigned blocks, unsigned blksz)
{
@@ -182,3 +189,20 @@ int mmc_io_rw_extended(struct mmc_card *
return 0;
}
+int sdio_reset(struct mmc_host *host)
+{
+ int ret;
+ u8 abort;
+
+ /* SDIO Simplified Specification V2.0, 4.4 Reset for SDIO */
+
+ ret = mmc_io_rw_direct_host(host, 0, 0, SDIO_CCCR_ABORT, 0, &abort);
+ if (ret)
+ abort = 0x08;
+ else
+ abort |= 0x08;
+
+ ret = mmc_io_rw_direct_host(host, 1, 0, SDIO_CCCR_ABORT, abort, NULL);
+ return ret;
+}
+
diff -puN drivers/mmc/core/sdio_ops.h~sdio-recognize-io-card-without-powercycle drivers/mmc/core/sdio_ops.h
--- a/drivers/mmc/core/sdio_ops.h~sdio-recognize-io-card-without-powercycle
+++ a/drivers/mmc/core/sdio_ops.h
@@ -17,6 +17,7 @@ int mmc_io_rw_direct(struct mmc_card *ca
unsigned addr, u8 in, u8* out);
int mmc_io_rw_extended(struct mmc_card *card, int write, unsigned fn,
unsigned addr, int incr_addr, u8 *buf, unsigned blocks, unsigned blksz);
+int sdio_reset(struct mmc_host *host);
#endif
_
Patches currently in -mm which might be from albert_herranz@xxxxxxxx are
linux-next.patch
sdio-recognize-io-card-without-powercycle.patch
sdio-pass-whitelisted-cis-funce-tuples-to-sdio-drivers.patch
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