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authorHeiko Schocher <hs@denx.de>2009-02-24 11:30:37 +0100
committerKim Phillips <kim.phillips@freescale.com>2009-03-05 18:21:17 -0600
commitc1bce4fff750d734b1fa7467eb08f93902c97ca6 (patch)
tree396054d02b41529fb90a4c534d45d01ad912bf91
parent19f0e93041dbfe22f8d39b98e4f7f9ea87b77803 (diff)
downloadu-boot-linaro-stable-c1bce4fff750d734b1fa7467eb08f93902c97ca6.tar.gz
83xx, i2c: add mux support for fsl_i2c
This patch adds I2C mux support for the fsl_i2c driver. This allows you to add "new" i2c busses, which are reached over i2c muxes. For more infos, please look in the README and search for CONFIG_I2C_MUX. Signed-off-by: Heiko Schocher <hs@denx.de> Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
-rw-r--r--drivers/i2c/fsl_i2c.c22
1 files changed, 21 insertions, 1 deletions
diff --git a/drivers/i2c/fsl_i2c.c b/drivers/i2c/fsl_i2c.c
index ce646fd7e..6ab7d3d9f 100644
--- a/drivers/i2c/fsl_i2c.c
+++ b/drivers/i2c/fsl_i2c.c
@@ -42,6 +42,9 @@ DECLARE_GLOBAL_DATA_PTR;
#define CONFIG_SYS_SPD_BUS_NUM 0
#endif
static unsigned int i2c_bus_num __attribute__ ((section (".data"))) = CONFIG_SYS_SPD_BUS_NUM;
+#if defined(CONFIG_I2C_MUX)
+static unsigned int i2c_bus_num_mux __attribute__ ((section ("data"))) = 0;
+#endif
static unsigned int i2c_bus_speed[2] = {CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SPEED};
@@ -369,6 +372,19 @@ i2c_probe(uchar chip)
int i2c_set_bus_num(unsigned int bus)
{
+#if defined(CONFIG_I2C_MUX)
+ if (bus < CONFIG_SYS_MAX_I2C_BUS) {
+ i2c_bus_num = bus;
+ } else {
+ int ret;
+
+ ret = i2x_mux_select_mux(bus);
+ if (ret)
+ return ret;
+ i2c_bus_num = 0;
+ }
+ i2c_bus_num_mux = bus;
+#else
#ifdef CONFIG_SYS_I2C2_OFFSET
if (bus > 1) {
#else
@@ -378,7 +394,7 @@ int i2c_set_bus_num(unsigned int bus)
}
i2c_bus_num = bus;
-
+#endif
return 0;
}
@@ -396,7 +412,11 @@ int i2c_set_bus_speed(unsigned int speed)
unsigned int i2c_get_bus_num(void)
{
+#if defined(CONFIG_I2C_MUX)
+ return i2c_bus_num_mux;
+#else
return i2c_bus_num;
+#endif
}
unsigned int i2c_get_bus_speed(void)