MX: Added Freescale Power Management Driver

The patch add supports for the Freescale's Power
Management Controller (known as Atlas) used together with i.MX31/51
processors. It was tested with a MC13783 (MX31) and
MC13892 (MX51).

Signed-off-by: Stefano Babic <sbabic@denx.de>

2 files changed, 201 insertions, 0 deletions

diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 685ae8c..0c88a69 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -34,6 +34,7 @@ COBJS-$(CONFIG_IMX_PWM) += imx_pwm.o
 COBJS-$(CONFIG_NS87308) += ns87308.o
 COBJS-$(CONFIG_STATUS_LED) += status_led.o
 COBJS-$(CONFIG_TWL4030_LED) += twl4030_led.o
+COBJS-$(CONFIG_FSL_PMIC) += fsl_pmic.o
 
 COBJS	:= $(COBJS-y)
 SRCS	:= $(COBJS:.o=.c)
diff --git a/drivers/misc/fsl_pmic.c b/drivers/misc/fsl_pmic.c
new file mode 100644
index 0000000..87f0aed
--- /dev/null
+++ b/drivers/misc/fsl_pmic.c
@@ -0,0 +1,200 @@
+/*
+ * (C) Copyright 2008-2009 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 <config.h>
+#include <common.h>
+#include <spi.h>
+#include <asm/errno.h>
+#include <linux/types.h>
+#include <fsl_pmic.h>
+
+static struct spi_slave *slave;
+
+struct spi_slave *pmic_spi_probe(void)
+{
+	return spi_setup_slave(CONFIG_FSL_PMIC_BUS,
+		CONFIG_FSL_PMIC_CS,
+		CONFIG_FSL_PMIC_CLK,
+		CONFIG_FSL_PMIC_MODE);
+}
+
+void pmic_spi_free(struct spi_slave *slave)
+{
+	if (slave)
+		spi_free_slave(slave);
+}
+
+u32 pmic_reg(u32 reg, u32 val, u32 write)
+{
+	u32 pmic_tx, pmic_rx;
+
+	if (!slave) {
+		slave = pmic_spi_probe();
+
+		if (!slave)
+			return -1;
+	}
+
+	if (reg > 63 || write > 1) {
+		printf("<reg num> = %d is invalid. Should be less then 63\n",
+			reg);
+		return -1;
+	}
+
+	if (spi_claim_bus(slave))
+		return -1;
+
+	pmic_tx = (write << 31) | (reg << 25) | (val & 0x00FFFFFF);
+
+	if (spi_xfer(slave, 4 << 3, &pmic_tx, &pmic_rx,
+			SPI_XFER_BEGIN | SPI_XFER_END)) {
+		spi_release_bus(slave);
+		return -1;
+	}
+
+	if (write) {
+		pmic_tx &= ~(1 << 31);
+		if (spi_xfer(slave, 4 << 3, &pmic_tx, &pmic_rx,
+			SPI_XFER_BEGIN | SPI_XFER_END)) {
+			spi_release_bus(slave);
+			return -1;
+		}
+	}
+
+	spi_release_bus(slave);
+	return pmic_rx;
+}
+
+void pmic_reg_write(u32 reg, u32 value)
+{
+	pmic_reg(reg, value, 1);
+}
+
+u32 pmic_reg_read(u32 reg)
+{
+	return pmic_reg(reg, 0, 0);
+}
+
+void pmic_show_pmic_info(void)
+{
+	u32 rev_id;
+
+	rev_id = pmic_reg_read(REG_IDENTIFICATION);
+	printf("PMIC ID: 0x%08x [Rev: ", rev_id);
+	switch (rev_id & 0x1F) {
+	case 0x1:
+		puts("1.0");
+		break;
+	case 0x9:
+		puts("1.1");
+		break;
+	case 0xA:
+		puts("1.2");
+		break;
+	case 0x10:
+		puts("2.0");
+		break;
+	case 0x11:
+		puts("2.1");
+		break;
+	case 0x18:
+		puts("3.0");
+		break;
+	case 0x19:
+		puts("3.1");
+		break;
+	case 0x1A:
+		puts("3.2");
+		break;
+	case 0x2:
+		puts("3.2A");
+		break;
+	case 0x1B:
+		puts("3.3");
+		break;
+	case 0x1D:
+		puts("3.5");
+		break;
+	default:
+		puts("unknown");
+		break;
+	}
+	puts("]\n");
+}
+
+static void pmic_dump(int numregs)
+{
+	u32 val;
+	int i;
+
+	pmic_show_pmic_info();
+	for (i = 0; i < numregs; i++) {
+		val = pmic_reg_read(i);
+		if (!(i % 8))
+			printf ("\n0x%02x: ", i);
+		printf("%08x ", val);
+	}
+	puts("\n");
+}
+
+int do_pmic(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+	char *cmd;
+	int nregs;
+	u32 val;
+
+	/* at least two arguments please */
+	if (argc < 2) {
+		cmd_usage(cmdtp);
+		return 1;
+	}
+
+	cmd = argv[1];
+	if (strcmp(cmd, "dump") == 0) {
+		if (argc < 3) {
+			cmd_usage(cmdtp);
+			return 1;
+		}
+		nregs = simple_strtoul(argv[2], NULL, 16);
+		pmic_dump(nregs);
+		return 0;
+	}
+	if (strcmp(cmd, "write") == 0) {
+		if (argc < 4) {
+			cmd_usage(cmdtp);
+			return 1;
+		}
+		nregs = simple_strtoul(argv[2], NULL, 16);
+		val = simple_strtoul(argv[3], NULL, 16);
+		pmic_reg_write(nregs, val);
+		return 0;
+	}
+	/* No subcommand found */
+	return 1;
+}
+
+U_BOOT_CMD(
+	pmic,	CONFIG_SYS_MAXARGS, 1, do_pmic,
+	"Freescale PMIC (Atlas)",
+	"dump [numregs] dump registers\n"
+	"pmic write <reg> <value> - write register"
+);