ENGR00139213: Add read and change voltage support for mx6

dd read and change voltage support for mx6.
For help, pls type "help regul"
Detail command info:
regul list - List all regulators' name
regul show all - Display all regulators' voltage
regul show core - Show core voltage in mV
regul show periph - Show peripheral voltage in mV
regul show <regulator name> - Show regulator's voltage in mV
regul set core <voltage value> - Set core voltage in mV
regul set periph <voltage value> - Set periph voltage in mV
regul set <regulator name> <voltage value> - Set regulator's voltage in
mV

Example:
MX6Q ARM2 U-Boot > regul list
Name            Voltage
vddpu
vddcore
vddsoc
vdd2p5
vdd1p1
vdd3p0
MX6Q ARM2 U-Boot > regul show all
Name            Voltage
vddpu           1100000
vddcore         1100000
vddsoc          1200000
vdd2p5          2400000
vdd1p1          1100000
vdd3p0          3000000
MX6Q ARM2 U-Boot > regul show periph
Name            Voltage
periph:         1100000
MX6Q ARM2 U-Boot > regul show core
Name            Voltage
core:           1100000
MX6Q ARM2 U-Boot > regul set core 1100000
Set voltage succeed!
Name            Voltage
core:           1100000

Signed-off-by: Terry Lv <r65388@freescale.com>

2 files changed, 107 insertions, 0 deletions

diff --git a/common/Makefile b/common/Makefile
index 1f218e7b7e..413b18c1cb 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -136,6 +136,7 @@ endif
 COBJS-y += cmd_pcmcia.o
 COBJS-$(CONFIG_CMD_PORTIO) += cmd_portio.o
 COBJS-$(CONFIG_CMD_REGINFO) += cmd_reginfo.o
+COBJS-$(CONFIG_CMD_REGUL) += cmd_regul.o
 COBJS-$(CONFIG_CMD_REISER) += cmd_reiser.o
 COBJS-$(CONFIG_CMD_SATA) += cmd_sata.o
 COBJS-$(CONFIG_CMD_SF) += cmd_sf.o
diff --git a/common/cmd_regul.c b/common/cmd_regul.c
new file mode 100644
index 0000000000..343d616d90
--- /dev/null
+++ b/common/cmd_regul.c
@@ -0,0 +1,106 @@
+/*
+ * Copyright (C) 2012 Freescale Semiconductor, Inc.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <linux/types.h>
+#include <command.h>
+#include <common.h>
+#include <asm/regulator.h>
+
+int do_regulops(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+	int rc = 0;
+	int uv = 0;
+
+	switch (argc) {
+	case 2:
+		if (strcmp(argv[1], "list") == 0)
+			regul_list(0);
+		else
+			printf("Unsupported command: %s!\n", argv[1]);
+
+		break;
+	case 3:
+		if (strcmp(argv[1], "show") == 0) {
+			if (strcmp(argv[2], "all") == 0) {
+				regul_list(1);
+				break;
+			} else if (strcmp(argv[2], "core") == 0)
+				uv = regul_get_core();
+			else if (strcmp(argv[2], "periph") == 0)
+				uv = regul_get_periph();
+			else
+				uv = regul_get(argv[2]);
+
+			if (uv >= 0)
+				printf("Name\t\tVoltage\n");
+				printf("%s:\t\t%d\n", argv[2], uv);
+			else
+				printf("Can't get regulator's voltage!\n");
+		} else
+			printf("Unsupported command: %s!\n", argv[1]);
+		break;
+	case 4:
+		if (strcmp(argv[1], "set") == 0) {
+			uv = simple_strtoul(argv[3], NULL, 10);
+			if (strcmp(argv[2], "core") == 0)
+				rc = regul_set_core(uv);
+			else if (strcmp(argv[2], "periph") == 0)
+				rc = regul_set_periph(uv);
+			else
+				rc = regul_set(argv[2], uv);
+
+			if (!rc) {
+				printf("Set voltage succeed!\n");
+				printf("Name\t\tVoltage\n");
+				printf("%s:\t\t%d\n", argv[2], uv);
+			}
+		} else
+			printf("Unsupported command: %s!\n", argv[1]);
+		break;
+	default:
+		rc = 1;
+		printf("Too many or less parameters!\n");
+		break;
+	}
+
+	return rc;
+}
+
+U_BOOT_CMD(
+	regul, 4, 1, do_regulops,
+	"Regulator sub system",
+	"list - List all regulators' name\n"
+	"regul show all "
+	"- Display all regulators' voltage\n"
+	"regul show core "
+	"- Show core voltage in mV\n"
+	"regul show periph "
+	"- Show peripheral voltage in mV\n"
+	"regul show <regulator name> "
+	"- Show regulator's voltage in mV\n"
+	"regul set core <voltage value> "
+	"- Set core voltage in mV\n"
+	"regul set periph <voltage value> "
+	"- Set periph voltage in mV\n"
+	"regul set <regulator name> <voltage value> "
+	"- Set regulator's voltage in mV");
+