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Subject[PATCH 1/2] 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>
Index: linux/drivers/mmc/mmc.c
===================================================================
--- linux/drivers/mmc/mmc.c (revision 151)
+++ linux/drivers/mmc/mmc.c (working copy)
@@ -457,6 +457,11 @@
{
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 @@
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 @@

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 @@
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);
}
Index: linux/include/linux/mmc/host.h
===================================================================
--- linux/include/linux/mmc/host.h (revision 151)
+++ linux/include/linux/mmc/host.h (working copy)
@@ -46,6 +46,12 @@
#define MMC_BUSMODE_OPENDRAIN 1
#define MMC_BUSMODE_PUSHPULL 2

+ unsigned char chip_select; /* SPI chip select */
+
+#define MMC_CS_DONTCARE 0
+#define MMC_CS_HIGH 1
+#define MMC_CS_LOW 2
+
unsigned char power_mode; /* power supply mode */

#define MMC_POWER_OFF 0
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