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>

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>
York Sun · Heiko Schocher
1 parent f539094f48
Showing 1 changed file with 50 additions and 0 deletions Side-by-side Diff
common/cmd_i2c.c
@@ -223,7 +223,55 @@
 	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 @@
 	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 @@
 	"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"
...	...	@@ -223,7 +223,55 @@
223	223	return 0;
224	224	}
225	225
	226	+static int do_i2c_write(cmd_tbl_t cmdtp, int flag, int argc, char const argv[])
	227	+{
	228	+ u_char chip;
	229	+ uint devaddr, alen, length;
	230	+ u_char *memaddr;
	231	+
	232	+ if (argc != 5)
	233	+ return cmd_usage(cmdtp);
	234	+
	235	+ /*
	236	+ * memaddr is the address where to store things in memory
	237	+ */
	238	+ memaddr = (u_char *)simple_strtoul(argv[1], NULL, 16);
	239	+
	240	+ /*
	241	+ * I2C chip address
	242	+ */
	243	+ chip = simple_strtoul(argv[2], NULL, 16);
	244	+
	245	+ /*
	246	+ * I2C data address within the chip. This can be 1 or
	247	+ * 2 bytes long. Some day it might be 3 bytes long :-).
	248	+ */
	249	+ devaddr = simple_strtoul(argv[3], NULL, 16);
	250	+ alen = get_alen(argv[3]);
	251	+ if (alen > 3)
	252	+ return cmd_usage(cmdtp);
	253	+
	254	+ /*
	255	+ * Length is the number of objects, not number of bytes.
	256	+ */
	257	+ length = simple_strtoul(argv[4], NULL, 16);
	258	+
	259	+ while (length-- > 0) {
	260	+ if (i2c_write(chip, devaddr++, alen, memaddr++, 1) != 0) {
	261	+ puts("Error writing to the chip.\n");
	262	+ return 1;
	263	+ }
226	264	/*
	265	+ * No write delay with FRAM devices.
	266	+ */
	267	+#if !defined(CONFIG_SYS_I2C_FRAM)
	268	+ udelay(11000);
	269	+#endif
	270	+ }
	271	+ return 0;
	272	+}
	273	+
	274	+/*
227	275	* Syntax:
228	276	* i2c md {i2c_chip} {addr}{.0, .1, .2} {len}
229	277	*/
...	...	@@ -1282,6 +1330,7 @@
1282	1330	U_BOOT_CMD_MKENT(nm, 2, 1, do_i2c_nm, "", ""),
1283	1331	U_BOOT_CMD_MKENT(probe, 0, 1, do_i2c_probe, "", ""),
1284	1332	U_BOOT_CMD_MKENT(read, 5, 1, do_i2c_read, "", ""),
	1333	+ U_BOOT_CMD_MKENT(write, 5, 0, do_i2c_write, "", ""),
1285	1334	U_BOOT_CMD_MKENT(reset, 0, 1, do_i2c_reset, "", ""),
1286	1335	#if defined(CONFIG_CMD_SDRAM)
1287	1336	U_BOOT_CMD_MKENT(sdram, 1, 1, do_sdram, "", ""),
...	...	@@ -1333,6 +1382,7 @@
1333	1382	"i2c nm chip address[.0, .1, .2] - write to I2C device (constant address)\n"
1334	1383	"i2c probe - show devices on the I2C bus\n"
1335	1384	"i2c read chip address[.0, .1, .2] length memaddress - read to memory \n"
	1385	+ "i2c write memaddress chip address[.0, .1, .2] length - write memory to i2c\n"
1336	1386	"i2c reset - re-init the I2C Controller\n"
1337	1387	#if defined(CONFIG_CMD_SDRAM)
1338	1388	"i2c sdram chip - print SDRAM configuration information\n"