[MMC] ios for mmc chip select

Adds a new ios for setting the chip select pin on MMC cards. Needed on
SD controllers which use this pin for other things and therefore cannot
have it pulled high at all times.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index 3c5904834fe8..0a8165974ba7 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -457,6 +457,11 @@ static void mmc_idle_cards(struct mmc_host *host)
 {
         struct mmc_command cmd;
 
+        host->ios.chip_select = MMC_CS_HIGH;
+        host->ops->set_ios(host, &host->ios);
+
+        mmc_delay(1);
+
         cmd.opcode = MMC_GO_IDLE_STATE;
         cmd.arg = 0;
         cmd.flags = MMC_RSP_NONE;
@@ -464,6 +469,11 @@ static void mmc_idle_cards(struct mmc_host *host)
         mmc_wait_for_cmd(host, &cmd, 0);
 
         mmc_delay(1);
+
+        host->ios.chip_select = MMC_CS_DONTCARE;
+        host->ops->set_ios(host, &host->ios);
+
+        mmc_delay(1);
 }
 
 /*
@@ -475,6 +485,7 @@ static void mmc_power_up(struct mmc_host *host)
 
         host->ios.vdd = bit;
         host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
+        host->ios.chip_select = MMC_CS_DONTCARE;
         host->ios.power_mode = MMC_POWER_UP;
         host->ops->set_ios(host, &host->ios);
 
@@ -492,6 +503,7 @@ static void mmc_power_off(struct mmc_host *host)
         host->ios.clock = 0;
         host->ios.vdd = 0;
         host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
+        host->ios.chip_select = MMC_CS_DONTCARE;
         host->ios.power_mode = MMC_POWER_OFF;
         host->ops->set_ios(host, &host->ios);
 }