sdio: recognize io card without powercycle
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@yahoo.es>
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_ops.c b/drivers/mmc/core/sdio_ops.c
index 4eb7825f..dea36d9 100644
--- a/drivers/mmc/core/sdio_ops.c
+++ b/drivers/mmc/core/sdio_ops.c
@@ -67,13 +67,13 @@
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 @@
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 @@
}
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 @@
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 @@
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;
+}
+