Add i2c write command to write data from memory to i2c devices.
Signed-off-by: York Sun yorksun@freescale.com --- common/cmd_i2c.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+)
diff --git a/common/cmd_i2c.c b/common/cmd_i2c.c index 2cdc4ed..6099115 100644 --- a/common/cmd_i2c.c +++ b/common/cmd_i2c.c @@ -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"