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authorStefan Bigler <stefan.bigler@keymile.com>2011-04-08 16:24:08 +0200
committerHeiko Schocher <hs@denx.de>2011-04-28 10:56:54 +0200
commitc649dda537a1a585e51066169e6fdb67e2b8f59e (patch)
tree3e9059b78166e3b1e2e083948107a36d902e4959
parenta000b7950da938d2df37ec5e081cd0680e6e4bbe (diff)
downloadu-boot-linaro-natty-c649dda537a1a585e51066169e6fdb67e2b8f59e.tar.gz
i2c: add i2c deblock sequence before and after every mux config
To make sure that the mux can be configured a deblocking sequence is done before the mux configuration. After the mux switch the new leaf of, the i2c tree must be again deblocked. Signed-off-by: Stefan Bigler <stefan.bigler@keymile.com> Acked-by: Heiko Schocher <hs@denx.de> cc: Wolfgang Denk <wd@denx.de> cc: Detlev Zundel <dzu@denx.de> cc: Prafulla Wadaskar <prafulla@marvell.com> cc: Valentin Longchamp <valentin.longchamp@keymile.com> cc: Holger Brunck <holger.brunck@keymile.com> Signed-off-by: Valentin Longchamp <valentin.longchamp@keymile.com>
-rw-r--r--common/cmd_i2c.c12
-rw-r--r--include/i2c.h2
2 files changed, 12 insertions, 2 deletions
diff --git a/common/cmd_i2c.c b/common/cmd_i2c.c
index c272b0dd4..d913e1366 100644
--- a/common/cmd_i2c.c
+++ b/common/cmd_i2c.c
@@ -132,6 +132,14 @@ DECLARE_GLOBAL_DATA_PTR;
#define DISP_LINE_LEN 16
+/* implement possible board specific board init */
+void __def_i2c_init_board(void)
+{
+ return;
+}
+void i2c_init_board(void)
+ __attribute__((weak, alias("__def_i2c_init_board")));
+
/* TODO: Implement architecture-specific get/set functions */
unsigned int __def_i2c_get_bus_speed(void)
{
@@ -1541,6 +1549,8 @@ int i2x_mux_select_mux(int bus)
mux = dev->mux;
while (mux != NULL) {
+ /* do deblocking on each level of mux, before mux config */
+ i2c_init_board();
if (i2c_write(mux->chip, 0, 0, &mux->channel, 1) != 0) {
printf ("Error setting Mux: chip:%x channel: \
%x\n", mux->chip, mux->channel);
@@ -1548,6 +1558,8 @@ int i2x_mux_select_mux(int bus)
}
mux = mux->next;
}
+ /* do deblocking on each level of mux and after mux config */
+ i2c_init_board();
return 0;
}
#endif /* CONFIG_I2C_MUX */
diff --git a/include/i2c.h b/include/i2c.h
index cd23c8ac1..8ceb4c852 100644
--- a/include/i2c.h
+++ b/include/i2c.h
@@ -108,9 +108,7 @@
* repeatedly to change the speed and slave addresses.
*/
void i2c_init(int speed, int slaveaddr);
-#ifdef CONFIG_SYS_I2C_INIT_BOARD
void i2c_init_board(void);
-#endif
#ifdef CONFIG_SYS_I2C_BOARD_LATE_INIT
void i2c_board_late_init(void);
#endif