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>
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"
+);