[U-Boot] ColdFire I2C implementing I2C idle [PATCH] -- resent in git format

[Michael Durrant]

drivers_i2c_fsl_i2c.patch
   - need to set I2C to be idle according to the MCF5282 user's manual

   If I2SR[IBB] is set when the I2C bus module is enabled,
   execute the following code sequence before proceeding with
   normal initialization code. This issues a STOP command to the
   slave device, placing it in idle state as if it were just
   power-cycled on.

   I2CR = 0x0
   I2CR = 0xA
   dummy read of I2DR
   I2SR = 0x0
   I2CR = 0x0

Signed-off-by: David Wu <davidwu at arcturusnetworks.com>
Signed-off-by: Michael Durrant <mdurrant at arcturusnetworks.com>
---
 drivers/i2c/fsl_i2c.c |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/drivers/i2c/fsl_i2c.c b/drivers/i2c/fsl_i2c.c
index 2241990..bce750c 100644
--- a/drivers/i2c/fsl_i2c.c
+++ b/drivers/i2c/fsl_i2c.c
@@ -251,12 +251,25 @@ i2c_init(int speed, int slaveadd)
 #endif
 }
 
+static __inline__ int i2c_set_idle(void)
+{
+    writeb(0, &i2c_dev[i2c_bus_num]->cr);
+    writeb(I2C_CR_MEN | I2C_CR_MSTA, &i2c_dev[i2c_bus_num]->cr);
+    readb(&i2c_dev[i2c_bus_num]->dr);
+    writeb(0, &i2c_dev[i2c_bus_num]->sr);
+    writeb(0, &i2c_dev[i2c_bus_num]->cr);
+    writeb(I2C_CR_MEN, &i2c_dev[i2c_bus_num]->cr);
+}
+
 static int
 i2c_wait4bus(void)
 {
     unsigned long long timeval = get_ticks();
     const unsigned long long timeout = usec2ticks(CONFIG_I2C_MBB_TIMEOUT);
 
+    if (readb(&i2c_dev[i2c_bus_num]->sr) & I2C_SR_MBB)
+        i2c_set_idle();
+
     while (readb(&i2c_dev[i2c_bus_num]->sr) & I2C_SR_MBB) {
         if ((get_ticks() - timeval) > timeout)
             return -1;
-- 1.4.3.4