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common/i2c: Add i2c write command 

Add i2c write command to write data from memory to i2c devices.

Signed-off-by: York Sun <yorksun@freescale.com>
This commit is contained in:
York Sun 2012-09-16 08:02:30 +00:00 committed by Heiko Schocher
parent f539094f48
commit ff5d2dce1e
1 changed files with 50 additions and 0 deletions
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50
common/cmd_i2c.c
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@ -223,6 +223,54 @@ static int do_i2c_read ( cmd_tbl_t *cmdtp, int flag, int argc, char * const argv
return 0;
}
static int do_i2c_write(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
u_char chip;
uint devaddr, alen, length;
u_char *memaddr;
if (argc != 5)
return cmd_usage(cmdtp);
/*
* memaddr is the address where to store things in memory
*/
memaddr = (u_char *)simple_strtoul(argv[1], NULL, 16);
/*
* I2C chip address
*/
chip = simple_strtoul(argv[2], NULL, 16);
/*
* I2C data address within the chip. This can be 1 or
* 2 bytes long. Some day it might be 3 bytes long :-).
*/
devaddr = simple_strtoul(argv[3], NULL, 16);
alen = get_alen(argv[3]);
if (alen > 3)
return cmd_usage(cmdtp);
/*
* Length is the number of objects, not number of bytes.
*/
length = simple_strtoul(argv[4], NULL, 16);
while (length-- > 0) {
if (i2c_write(chip, devaddr++, alen, memaddr++, 1) != 0) {
puts("Error writing to the chip.\n");
return 1;
}
/*
* No write delay with FRAM devices.
*/
#if !defined(CONFIG_SYS_I2C_FRAM)
udelay(11000);
#endif
}
return 0;
}
/*
* Syntax:
* i2c md {i2c_chip} {addr}{.0, .1, .2} {len}
@ -1282,6 +1330,7 @@ static cmd_tbl_t cmd_i2c_sub[] = {
U_BOOT_CMD_MKENT(nm, 2, 1, do_i2c_nm, "", ""),
U_BOOT_CMD_MKENT(probe, 0, 1, do_i2c_probe, "", ""),
U_BOOT_CMD_MKENT(read, 5, 1, do_i2c_read, "", ""),
U_BOOT_CMD_MKENT(write, 5, 0, do_i2c_write, "", ""),
U_BOOT_CMD_MKENT(reset, 0, 1, do_i2c_reset, "", ""),
#if defined(CONFIG_CMD_SDRAM)
U_BOOT_CMD_MKENT(sdram, 1, 1, do_sdram, "", ""),
@ -1333,6 +1382,7 @@ U_BOOT_CMD(
"i2c nm chip address[.0, .1, .2] - write to I2C device (constant address)\n"
"i2c probe - show devices on the I2C bus\n"
"i2c read chip address[.0, .1, .2] length memaddress - read to memory \n"
"i2c write memaddress chip address[.0, .1, .2] length - write memory to i2c\n"
"i2c reset - re-init the I2C Controller\n"
#if defined(CONFIG_CMD_SDRAM)
"i2c sdram chip - print SDRAM configuration information\n"