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-rw-r--r--src/drivers/power/Kconfig5
-rw-r--r--src/drivers/power/Makefile.inc20
-rw-r--r--src/drivers/power/max77686.c257
-rw-r--r--src/drivers/power/max77686.h134
4 files changed, 416 insertions, 0 deletions
diff --git a/src/drivers/power/Kconfig b/src/drivers/power/Kconfig
new file mode 100644
index 0000000000..84ace13dbf
--- /dev/null
+++ b/src/drivers/power/Kconfig
@@ -0,0 +1,5 @@
+config DRIVER_MAXIM_77686
+ bool "Maxim 77686"
+ default n
+ help
+ Maxim 77686 power regulator
diff --git a/src/drivers/power/Makefile.inc b/src/drivers/power/Makefile.inc
new file mode 100644
index 0000000000..3fc71042d5
--- /dev/null
+++ b/src/drivers/power/Makefile.inc
@@ -0,0 +1,20 @@
+##
+## This file is part of the coreboot project.
+##
+## Copyright (C) 2012 The ChromiumOS Authors
+##
+## 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; version 2 of the License.
+##
+## 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+##
+
+driver-$(CONFIG_DRIVER_MAXIM_77686) += max77686.c
diff --git a/src/drivers/power/max77686.c b/src/drivers/power/max77686.c
new file mode 100644
index 0000000000..8fbcb8fb31
--- /dev/null
+++ b/src/drivers/power/max77686.c
@@ -0,0 +1,257 @@
+/*
+ * Copyright (C) 2012 Samsung Electronics
+ * Alim Akhtar <alim.akhtar@samsung.com>
+ *
+ * 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 <common.h>
+#include <smbus.h>
+#include <max77686.h>
+
+/* Chip register numbers (not exported from this module) */
+enum {
+ REG_BBAT = 0x7e,
+
+ /* Bits for BBAT */
+ BBAT_BBCHOSTEN_MASK = 1 << 0,
+ BBAT_BBCVS_SHIFT = 3,
+ BBAT_BBCVS_MASK = 3 << BBAT_BBCVS_SHIFT,
+};
+
+/*
+ * Max77686 parameters values
+ * see max77686.h for parameters details
+ */
+struct max77686_para max77686_param[] = {/*{regnum, vol_addr, vol_bitpos,
+ vol_bitmask, reg_enaddr, reg_enbitpos, reg_enbitmask, reg_enbiton,
+ reg_enbitoff, vol_min, vol_div}*/
+ {PMIC_BUCK1, 0x11, 0x0, 0x3F, 0x10, 0x0, 0x3, 0x3, 0x0, 750, 50000},
+ {PMIC_BUCK2, 0x14, 0x0, 0xFF, 0x12, 0x4, 0x3, 0x1, 0x0, 600, 12500},
+ {PMIC_BUCK3, 0x1E, 0x0, 0xFF, 0x1C, 0x4, 0x3, 0x1, 0x0, 600, 12500},
+ {PMIC_BUCK4, 0x28, 0x0, 0xFF, 0x26, 0x4, 0x3, 0x1, 0x0, 600, 12500},
+ {PMIC_BUCK5, 0x31, 0x0, 0x3F, 0x30, 0x0, 0x3, 0x3, 0x0, 750, 50000},
+ {PMIC_BUCK6, 0x33, 0x0, 0x3F, 0x32, 0x0, 0x3, 0x3, 0x0, 750, 50000},
+ {PMIC_BUCK7, 0x35, 0x0, 0x3F, 0x34, 0x0, 0x3, 0x3, 0x0, 750, 50000},
+ {PMIC_BUCK8, 0x37, 0x0, 0x3F, 0x36, 0x0, 0x3, 0x3, 0x0, 750, 50000},
+ {PMIC_BUCK9, 0x39, 0x0, 0x3F, 0x38, 0x0, 0x3, 0x3, 0x0, 750, 50000},
+ {PMIC_LDO1, 0x40, 0x0, 0x3F, 0x40, 0x6, 0x3, 0x3, 0x0, 800, 25000},
+ {PMIC_LDO2, 0x41, 0x0, 0x3F, 0x41, 0x6, 0x3, 0x1, 0x0, 800, 25000},
+ {PMIC_LDO3, 0x42, 0x0, 0x3F, 0x42, 0x6, 0x3, 0x3, 0x0, 800, 50000},
+ {PMIC_LDO4, 0x43, 0x0, 0x3F, 0x43, 0x6, 0x3, 0x3, 0x0, 800, 50000},
+ {PMIC_LDO5, 0x44, 0x0, 0x3F, 0x44, 0x6, 0x3, 0x3, 0x0, 800, 50000},
+ {PMIC_LDO6, 0x45, 0x0, 0x3F, 0x45, 0x6, 0x3, 0x1, 0x0, 800, 25000},
+ {PMIC_LDO7, 0x46, 0x0, 0x3F, 0x46, 0x6, 0x3, 0x1, 0x0, 800, 25000},
+ {PMIC_LDO8, 0x47, 0x0, 0x3F, 0x47, 0x6, 0x3, 0x1, 0x0, 800, 25000},
+ {PMIC_LDO9, 0x48, 0x0, 0x3F, 0x48, 0x6, 0x3, 0x3, 0x0, 800, 50000},
+ {PMIC_LDO10, 0x49, 0x0, 0x3F, 0x49, 0x6, 0x3, 0x1, 0x0, 800, 50000},
+ {PMIC_LDO11, 0x4A, 0x0, 0x3F, 0x4A, 0x6, 0x3, 0x1, 0x0, 800, 50000},
+ {PMIC_LDO12, 0x4B, 0x0, 0x3F, 0x4B, 0x6, 0x3, 0x1, 0x0, 800, 50000},
+ {PMIC_LDO13, 0x4C, 0x0, 0x3F, 0x4C, 0x6, 0x3, 0x3, 0x0, 800, 50000},
+ {PMIC_LDO14, 0x4D, 0x0, 0x3F, 0x4D, 0x6, 0x3, 0x1, 0x0, 800, 50000},
+ {PMIC_LDO15, 0x4E, 0x0, 0x3F, 0x4E, 0x6, 0x3, 0x1, 0x0, 800, 25000},
+ {PMIC_LDO16, 0x4F, 0x0, 0x3F, 0x4F, 0x6, 0x3, 0x1, 0x0, 800, 50000},
+ {PMIC_LDO17, 0x50, 0x0, 0x3F, 0x50, 0x6, 0x3, 0x3, 0x0, 800, 50000},
+ {PMIC_LDO18, 0x51, 0x0, 0x3F, 0x51, 0x6, 0x3, 0x3, 0x0, 800, 50000},
+ {PMIC_LDO19, 0x52, 0x0, 0x3F, 0x52, 0x6, 0x3, 0x3, 0x0, 800, 50000},
+ {PMIC_LDO20, 0x53, 0x0, 0x3F, 0x53, 0x6, 0x3, 0x3, 0x0, 800, 50000},
+ {PMIC_LDO21, 0x54, 0x0, 0x3F, 0x54, 0x6, 0x3, 0x3, 0x0, 800, 50000},
+ {PMIC_LDO22, 0x55, 0x0, 0x3F, 0x55, 0x6, 0x3, 0x3, 0x0, 800, 50000},
+ {PMIC_LDO23, 0x56, 0x0, 0x3F, 0x56, 0x6, 0x3, 0x3, 0x0, 800, 50000},
+ {PMIC_LDO24, 0x57, 0x0, 0x3F, 0x57, 0x6, 0x3, 0x3, 0x0, 800, 50000},
+ {PMIC_LDO25, 0x58, 0x0, 0x3F, 0x58, 0x6, 0x3, 0x3, 0x0, 800, 50000},
+ {PMIC_LDO26, 0x59, 0x0, 0x3F, 0x59, 0x6, 0x3, 0x3, 0x0, 800, 50000},
+ {PMIC_EN32KHZ_CP, 0x0, 0x0, 0x0, 0x7F, 0x1, 0x1, 0x1, 0x0, 0x0, 0x0},
+};
+
+/*
+ * Write a value to a register
+ *
+ * @param chip_addr i2c addr for max77686
+ * @param reg reg number to write
+ * @param val value to be written
+ *
+ */
+static inline int max77686_i2c_write(unsigned char chip_addr,
+ unsigned int reg, unsigned char val)
+{
+ return i2c_write(chip_addr, reg, 1, &val, 1);
+}
+
+/*
+ * Read a value from a register
+ *
+ * @param chip_addr i2c addr for max77686
+ * @param reg reg number to write
+ * @param val value to be written
+ *
+ */
+static inline int max77686_i2c_read(unsigned char chip_addr,
+ unsigned int reg, unsigned char *val)
+{
+ return i2c_read(chip_addr, reg, 1, val, 1);
+}
+
+/*
+ * Enable the max77686 register
+ *
+ * @param reg register number of buck/ldo to be enabled
+ * @param enable enable or disable bit
+ *
+ * REG_DISABLE = 0,
+ needed to set the buck/ldo enable bit OFF
+ * @return Return 0 if ok, else -1
+ */
+static int max77686_enablereg(enum max77686_regnum reg, int enable)
+{
+ struct max77686_para *pmic;
+ unsigned char read_data;
+ int ret;
+
+ pmic = &max77686_param[reg];
+
+ ret = max77686_i2c_read(MAX77686_I2C_ADDR, pmic->reg_enaddr,
+ &read_data);
+ if (ret != 0) {
+ debug("max77686 i2c read failed.\n");
+ return -1;
+ }
+
+ if (enable == REG_DISABLE) {
+ clrbits_8(&read_data,
+ pmic->reg_enbitmask << pmic->reg_enbitpos);
+ } else {
+ clrsetbits_8(&read_data,
+ pmic->reg_enbitmask << pmic->reg_enbitpos,
+ pmic->reg_enbiton << pmic->reg_enbitpos);
+ }
+
+ ret = max77686_i2c_write(MAX77686_I2C_ADDR,
+ pmic->reg_enaddr, read_data);
+ if (ret != 0) {
+ debug("max77686 i2c write failed.\n");
+ return -1;
+ }
+
+ return 0;
+}
+
+static int max77686_do_volsetting(enum max77686_regnum reg, unsigned int volt,
+ int enable, int volt_units)
+{
+ struct max77686_para *pmic;
+ unsigned char read_data;
+ int vol_level = 0;
+ int ret;
+
+ pmic = &max77686_param[reg];
+
+ if (pmic->vol_addr == 0) {
+ debug("not a voltage register.\n");
+ return -1;
+ }
+
+ ret = max77686_i2c_read(MAX77686_I2C_ADDR, pmic->vol_addr, &read_data);
+ if (ret != 0) {
+ debug("max77686 i2c read failed.\n");
+ return -1;
+ }
+
+ if (volt_units == MAX77686_UV)
+ vol_level = volt - pmic->vol_min * 1000;
+ else
+ vol_level = (volt - pmic->vol_min) * 1000;
+
+ if (vol_level < 0) {
+ debug("Not a valid voltage level to set\n");
+ return -1;
+ }
+ vol_level /= pmic->vol_div;
+
+ clrsetbits_8(&read_data, pmic->vol_bitmask << pmic->vol_bitpos,
+ vol_level << pmic->vol_bitpos);
+
+ ret = max77686_i2c_write(MAX77686_I2C_ADDR, pmic->vol_addr, read_data);
+ if (ret != 0) {
+ debug("max77686 i2c write failed.\n");
+ return -1;
+ }
+
+ ret = max77686_enablereg(reg, enable);
+ if (ret != 0) {
+ debug("Failed to enable buck/ldo.\n");
+ return -1;
+ }
+
+ return 0;
+}
+
+int max77686_volsetting(enum max77686_regnum reg, unsigned int volt,
+ int enable, int volt_units)
+{
+ int old_bus = i2c_get_bus_num();
+ int ret;
+
+ i2c_set_bus_num(0);
+ ret = max77686_do_volsetting(reg, volt, enable, volt_units);
+ i2c_set_bus_num(old_bus);
+ return ret;
+}
+
+int max77686_enable_32khz_cp(void)
+{
+ i2c_set_bus_num(0);
+ return max77686_enablereg(PMIC_EN32KHZ_CP, REG_ENABLE);
+}
+
+int max77686_disable_backup_batt(void)
+{
+ unsigned char val;
+ int ret;
+
+ i2c_set_bus_num(0);
+ ret = max77686_i2c_read(MAX77686_I2C_ADDR, REG_BBAT, &val);
+ if (ret) {
+ debug("max77686 i2c read failed\n");
+ return ret;
+ }
+
+ /* If we already have the correct values, exit */
+ if ((val & (BBAT_BBCVS_MASK | BBAT_BBCHOSTEN_MASK)) ==
+ BBAT_BBCVS_MASK)
+ return 0;
+
+ /* First disable charging */
+ val &= ~BBAT_BBCHOSTEN_MASK;
+ ret = max77686_i2c_write(MAX77686_I2C_ADDR, REG_BBAT, val);
+ if (ret) {
+ debug("max77686 i2c write failed\n");
+ return -1;
+ }
+
+ /* Finally select 3.5V to minimize power consumption */
+ val |= BBAT_BBCVS_MASK;
+ ret = max77686_i2c_write(MAX77686_I2C_ADDR, REG_BBAT, val);
+ if (ret) {
+ debug("max77686 i2c write failed\n");
+ return -1;
+ }
+
+ return 0;
+}
diff --git a/src/drivers/power/max77686.h b/src/drivers/power/max77686.h
new file mode 100644
index 0000000000..345471eb21
--- /dev/null
+++ b/src/drivers/power/max77686.h
@@ -0,0 +1,134 @@
+/*
+ * Copyright (C) 2012 Samsung Electronics
+ * Alim Akhtar <alim.akhtar@samsung.com>
+ *
+ * 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
+ */
+
+#ifndef __MAX77686_H_
+#define __MAX77686_H_
+
+enum max77686_regnum {
+ PMIC_BUCK1 = 0,
+ PMIC_BUCK2,
+ PMIC_BUCK3,
+ PMIC_BUCK4,
+ PMIC_BUCK5,
+ PMIC_BUCK6,
+ PMIC_BUCK7,
+ PMIC_BUCK8,
+ PMIC_BUCK9,
+ PMIC_LDO1,
+ PMIC_LDO2,
+ PMIC_LDO3,
+ PMIC_LDO4,
+ PMIC_LDO5,
+ PMIC_LDO6,
+ PMIC_LDO7,
+ PMIC_LDO8,
+ PMIC_LDO9,
+ PMIC_LDO10,
+ PMIC_LDO11,
+ PMIC_LDO12,
+ PMIC_LDO13,
+ PMIC_LDO14,
+ PMIC_LDO15,
+ PMIC_LDO16,
+ PMIC_LDO17,
+ PMIC_LDO18,
+ PMIC_LDO19,
+ PMIC_LDO20,
+ PMIC_LDO21,
+ PMIC_LDO22,
+ PMIC_LDO23,
+ PMIC_LDO24,
+ PMIC_LDO25,
+ PMIC_LDO26,
+ PMIC_EN32KHZ_CP,
+};
+
+/**
+ * struct max77686_para - max77686 register parameters
+ * @param vol_addr i2c address of the given buck/ldo register
+ * @param vol_bitpos bit position to be set or clear within register
+ * @param vol_bitmask bit mask value
+ * @param reg_enaddr control register address, which enable the given
+ * given buck/ldo.
+ * @param reg_enbitpos bit position to be enabled
+ * @param reg_enbiton value to be written to buck/ldo to make it ON
+ * @param reg_enbitoff value to be written to buck/ldo to make it OFF
+ * @param vol_min minimum voltage level supported by given buck/ldo
+ * @param vol_div voltage division value of given buck/ldo
+ */
+struct max77686_para {
+ enum max77686_regnum regnum;
+ u8 vol_addr;
+ u8 vol_bitpos;
+ u8 vol_bitmask;
+ u8 reg_enaddr;
+ u8 reg_enbitpos;
+ u8 reg_enbitmask;
+ u8 reg_enbiton;
+ u8 reg_enbitoff;
+ u32 vol_min;
+ u32 vol_div;
+};
+
+/* I2C device address for pmic max77686 */
+#define MAX77686_I2C_ADDR (0x12 >> 1)
+
+enum {
+ REG_DISABLE = 0,
+ REG_ENABLE
+};
+
+enum {
+ MAX77686_MV = 0, /* mili volt */
+ MAX77686_UV /* micro volt */
+};
+
+/**
+ * This function enables the 32KHz coprocessor clock.
+ *
+ * Return 0 if ok, else -1
+ */
+int max77686_enable_32khz_cp(void);
+
+/**
+ * Set the required voltage level of pmic
+ *
+ * @param reg register number of buck/ldo to be set
+ * @param volt voltage level to be set
+ * @param enable enable or disable bit
+ * @param volt_units MAX77686_MV or MAX77686_UV, unit of the
+ * voltage parameters
+ *
+ * @return Return 0 if ok, else -1
+ */
+int max77686_volsetting(enum max77686_regnum reg, unsigned int volt,
+ int enable, int volt_units);
+
+/**
+ * Disable charging of the RTC backup battery
+ *
+ * @return Return 0 if ok, else -1
+ */
+int max77686_disable_backup_batt(void);
+
+#endif /* __MAX77686_PMIC_H_ */
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