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authorHeiko Schocher <hs@denx.de>2008-10-15 09:33:30 +0200
committerWolfgang Denk <wd@denx.de>2008-10-18 21:54:01 +0200
commite43a27c49712203fe8848a17714330623edfb2eb (patch)
tree66b24fe19b73696228ebc958fa430b78d65f0927 /common/cmd_i2c.c
parent86e9cdf8c415c1a9725e9dae5237ba1e7bd9f686 (diff)
downloadu-boot-linaro-natty-e43a27c49712203fe8848a17714330623edfb2eb.tar.gz
I2C: add new command i2c reset.
If I2C Bus is blocked (see doc/I2C_Edge_Conditions), it is not possible to get out of this, until the complete Hardware gets a reset. This new commando calls again i2c_init (and that calls i2c_init_board if defined), which will deblock the I2C Bus. Signed-off-by: Heiko Schocher <hs@denx.de> Signed-off-by: Wolfgang Denk <wd@denx.de>
Diffstat (limited to 'common/cmd_i2c.c')
-rw-r--r--common/cmd_i2c.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/common/cmd_i2c.c b/common/cmd_i2c.c
index ea80e8ae0..ef9123ebf 100644
--- a/common/cmd_i2c.c
+++ b/common/cmd_i2c.c
@@ -1182,6 +1182,12 @@ int do_sdram (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
#endif
#if defined(CONFIG_I2C_CMD_TREE)
+int do_i2c_reset(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
+{
+ i2c_init (CFG_I2C_SPEED, CFG_I2C_SLAVE);
+ return 0;
+}
+
#if defined(CONFIG_I2C_MULTI_BUS)
int do_i2c_bus_num(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
{
@@ -1238,6 +1244,8 @@ int do_i2c(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
return do_i2c_crc(cmdtp, flag, --argc, ++argv);
if (!strncmp(argv[1], "pr", 2))
return do_i2c_probe(cmdtp, flag, --argc, ++argv);
+ if (!strncmp(argv[1], "re", 2))
+ return do_i2c_reset(cmdtp, flag, --argc, ++argv);
if (!strncmp(argv[1], "lo", 2))
return do_i2c_loop(cmdtp, flag, --argc, ++argv);
#if defined(CONFIG_CMD_SDRAM)
@@ -1266,6 +1274,7 @@ U_BOOT_CMD(
"i2c nm chip address[.0, .1, .2] - write to I2C device (constant address)\n"
"i2c crc32 chip address[.0, .1, .2] count - compute CRC32 checksum\n"
"i2c probe - show devices on the I2C bus\n"
+ "i2c reset - re-init the I2C Controller\n"
"i2c loop chip address[.0, .1, .2] [# of objects] - looping read of device\n"
#if defined(CONFIG_CMD_SDRAM)
"i2c sdram chip - print SDRAM configuration information\n"