[PATCH] I2C: Add support for multiple I2C busses for RTC & DTT

[u-boot] / common / soft_i2c.c

diff --git a/common/soft_i2c.c b/common/soft_i2c.c
index f7ca49840a08173e8e037e99310076bbfe59ffc1..edad51bc4180517a2093622296ce18bf0b27f2b4 100644 (file)
--- a/common/soft_i2c.c
+++ b/common/soft_i2c.c
@@ -33,12 +33,19 @@
 #include <asm/io.h>
 #include <asm/arch/hardware.h>
 #endif
+#ifdef CONFIG_IXP425                   /* only valid for IXP425 */
+#include <asm/arch/ixp425.h>
+#endif
 #include <i2c.h>
 
 #if defined(CONFIG_SOFT_I2C)
 
 /* #define     DEBUG_I2C       */
 
+#ifdef DEBUG_I2C
+DECLARE_GLOBAL_DATA_PTR;
+#endif
+
 
 /*-----------------------------------------------------------------------
  * Definitions
@@ -53,7 +60,6 @@
 
 #ifdef DEBUG_I2C
 #define PRINTD(fmt,args...)    do {    \
-       DECLARE_GLOBAL_DATA_PTR;        \
        if (gd->have_console)           \
                printf (fmt ,##args);   \
        } while (0)
@@ -164,13 +170,10 @@ static void send_ack(int ack)
        volatile immap_t *immr = (immap_t *)CFG_IMMR;
 #endif
 
-       I2C_ACTIVE;
        I2C_SCL(0);
        I2C_DELAY;
-
-       I2C_SDA(ack);
-
        I2C_ACTIVE;
+       I2C_SDA(ack);
        I2C_DELAY;
        I2C_SCL(1);
        I2C_DELAY;
@@ -288,7 +291,10 @@ int i2c_probe(uchar addr)
 {
        int rc;
 
-       /* perform 1 byte read transaction */
+       /*
+        * perform 1 byte write transaction with just address byte
+        * (fake write)
+        */
        send_start();
        rc = write_byte ((addr << 1) | 0);
        send_stop();
@@ -399,7 +405,7 @@ int  i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len)
  */
 uchar i2c_reg_read(uchar i2c_addr, uchar reg)
 {
-       char buf;
+       uchar buf;
 
        i2c_read(i2c_addr, reg, 1, &buf, 1);