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authorFrans Meulenbroeks <fransmeulenbroeks@gmail.com>2010-02-25 10:12:16 +0100
committerWolfgang Denk <wd@denx.de>2010-03-21 22:44:43 +0100
commit652e53546b23c25f80756287eaf607b713afdc87 (patch)
tree209fd8d210066dbc825b790e12fca18eca88372a /common/cmd_i2c.c
parentfb0070e9101a1f288d7054f7e80b3d808fd7ead2 (diff)
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cmd_i2c.c: added i2c read to memory function
Signed-off-by: Frans Meulenbroeks <fransmeulenbroeks@gmail.com>
Diffstat (limited to 'common/cmd_i2c.c')
-rw-r--r--common/cmd_i2c.c60
1 files changed, 59 insertions, 1 deletions
diff --git a/common/cmd_i2c.c b/common/cmd_i2c.c
index b51d0c9..ee9577c 100644
--- a/common/cmd_i2c.c
+++ b/common/cmd_i2c.c
@@ -154,6 +154,63 @@ int i2c_set_bus_speed(unsigned int)
*/
#define DISP_LINE_LEN 16
+/*
+ * Syntax:
+ * i2c read {i2c_chip} {devaddr}{.0, .1, .2} {len} {memaddr}
+ */
+
+int do_i2c_read ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+ u_char chip;
+ uint devaddr, alen, length;
+ u_char *memaddr;
+ int j;
+
+ if (argc != 5) {
+ cmd_usage(cmdtp);
+ return 1;
+ }
+
+ /*
+ * I2C chip address
+ */
+ chip = simple_strtoul(argv[1], 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[2], NULL, 16);
+ alen = 1;
+ for (j = 0; j < 8; j++) {
+ if (argv[2][j] == '.') {
+ alen = argv[2][j+1] - '0';
+ if (alen > 3) {
+ cmd_usage(cmdtp);
+ return 1;
+ }
+ break;
+ } else if (argv[2][j] == '\0')
+ break;
+ }
+
+ /*
+ * Length is the number of objects, not number of bytes.
+ */
+ length = simple_strtoul(argv[3], NULL, 16);
+
+ /*
+ * memaddr is the address where to store things in memory
+ */
+ memaddr = (u_char *)simple_strtoul(argv[4], NULL, 16);
+
+ if (i2c_read(chip, devaddr, alen, memaddr, length) != 0) {
+ puts ("Error reading the chip.\n");
+ return 1;
+ }
+ return 0;
+}
+
int do_i2c_md ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
u_char chip;
@@ -1272,6 +1329,7 @@ static cmd_tbl_t cmd_i2c_sub[] = {
U_BOOT_CMD_MKENT(mw, 3, 1, do_i2c_mw, "", ""),
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(reset, 0, 1, do_i2c_reset, "", ""),
#if defined(CONFIG_CMD_SDRAM)
U_BOOT_CMD_MKENT(sdram, 1, 1, do_sdram, "", ""),
@@ -1315,6 +1373,7 @@ U_BOOT_CMD(
"i2c mw chip address[.0, .1, .2] value [count] - write to I2C device (fill)\n"
"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 reset - re-init the I2C Controller\n"
#if defined(CONFIG_CMD_SDRAM)
"i2c sdram chip - print SDRAM configuration information\n"
@@ -1323,7 +1382,6 @@ U_BOOT_CMD(
);
#if defined(CONFIG_I2C_MUX)
-
int i2c_mux_add_device(I2C_MUX_DEVICE *dev)
{
I2C_MUX_DEVICE *devtmp = i2c_mux_devices;