694 lines
16 KiB
C
694 lines
16 KiB
C
/*
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* Regulator driver for TPS6524x PMIC
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*
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* Copyright (C) 2010 Texas Instruments
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation version 2.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
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* whether express or implied; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/err.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/spi/spi.h>
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#include <linux/regulator/driver.h>
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#include <linux/regulator/machine.h>
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#define REG_LDO_SET 0x0
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#define LDO_ILIM_MASK 1 /* 0 = 400-800, 1 = 900-1500 */
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#define LDO_VSEL_MASK 0x0f
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#define LDO2_ILIM_SHIFT 12
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#define LDO2_VSEL_SHIFT 4
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#define LDO1_ILIM_SHIFT 8
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#define LDO1_VSEL_SHIFT 0
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#define REG_BLOCK_EN 0x1
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#define BLOCK_MASK 1
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#define BLOCK_LDO1_SHIFT 0
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#define BLOCK_LDO2_SHIFT 1
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#define BLOCK_LCD_SHIFT 2
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#define BLOCK_USB_SHIFT 3
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#define REG_DCDC_SET 0x2
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#define DCDC_VDCDC_MASK 0x1f
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#define DCDC_VDCDC1_SHIFT 0
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#define DCDC_VDCDC2_SHIFT 5
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#define DCDC_VDCDC3_SHIFT 10
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#define REG_DCDC_EN 0x3
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#define DCDCDCDC_EN_MASK 0x1
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#define DCDCDCDC1_EN_SHIFT 0
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#define DCDCDCDC1_PG_MSK BIT(1)
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#define DCDCDCDC2_EN_SHIFT 2
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#define DCDCDCDC2_PG_MSK BIT(3)
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#define DCDCDCDC3_EN_SHIFT 4
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#define DCDCDCDC3_PG_MSK BIT(5)
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#define REG_USB 0x4
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#define USB_ILIM_SHIFT 0
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#define USB_ILIM_MASK 0x3
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#define USB_TSD_SHIFT 2
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#define USB_TSD_MASK 0x3
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#define USB_TWARN_SHIFT 4
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#define USB_TWARN_MASK 0x3
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#define USB_IWARN_SD BIT(6)
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#define USB_FAST_LOOP BIT(7)
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#define REG_ALARM 0x5
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#define ALARM_LDO1 BIT(0)
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#define ALARM_DCDC1 BIT(1)
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#define ALARM_DCDC2 BIT(2)
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#define ALARM_DCDC3 BIT(3)
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#define ALARM_LDO2 BIT(4)
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#define ALARM_USB_WARN BIT(5)
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#define ALARM_USB_ALARM BIT(6)
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#define ALARM_LCD BIT(9)
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#define ALARM_TEMP_WARM BIT(10)
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#define ALARM_TEMP_HOT BIT(11)
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#define ALARM_NRST BIT(14)
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#define ALARM_POWERUP BIT(15)
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#define REG_INT_ENABLE 0x6
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#define INT_LDO1 BIT(0)
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#define INT_DCDC1 BIT(1)
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#define INT_DCDC2 BIT(2)
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#define INT_DCDC3 BIT(3)
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#define INT_LDO2 BIT(4)
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#define INT_USB_WARN BIT(5)
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#define INT_USB_ALARM BIT(6)
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#define INT_LCD BIT(9)
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#define INT_TEMP_WARM BIT(10)
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#define INT_TEMP_HOT BIT(11)
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#define INT_GLOBAL_EN BIT(15)
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#define REG_INT_STATUS 0x7
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#define STATUS_LDO1 BIT(0)
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#define STATUS_DCDC1 BIT(1)
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#define STATUS_DCDC2 BIT(2)
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#define STATUS_DCDC3 BIT(3)
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#define STATUS_LDO2 BIT(4)
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#define STATUS_USB_WARN BIT(5)
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#define STATUS_USB_ALARM BIT(6)
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#define STATUS_LCD BIT(9)
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#define STATUS_TEMP_WARM BIT(10)
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#define STATUS_TEMP_HOT BIT(11)
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#define REG_SOFTWARE_RESET 0xb
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#define REG_WRITE_ENABLE 0xd
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#define REG_REV_ID 0xf
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#define N_DCDC 3
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#define N_LDO 2
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#define N_SWITCH 2
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#define N_REGULATORS (3 /* DCDC */ + \
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2 /* LDO */ + \
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2 /* switch */)
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#define FIXED_ILIMSEL BIT(0)
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#define FIXED_VOLTAGE BIT(1)
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#define CMD_READ(reg) ((reg) << 6)
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#define CMD_WRITE(reg) (BIT(5) | (reg) << 6)
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#define STAT_CLK BIT(3)
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#define STAT_WRITE BIT(2)
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#define STAT_INVALID BIT(1)
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#define STAT_WP BIT(0)
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struct field {
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int reg;
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int shift;
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int mask;
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};
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struct supply_info {
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const char *name;
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int n_voltages;
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const int *voltages;
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int fixed_voltage;
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int n_ilimsels;
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const int *ilimsels;
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int fixed_ilimsel;
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int flags;
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struct field enable, voltage, ilimsel;
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};
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struct tps6524x {
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struct device *dev;
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struct spi_device *spi;
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struct mutex lock;
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struct regulator_desc desc[N_REGULATORS];
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struct regulator_dev *rdev[N_REGULATORS];
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};
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static int __read_reg(struct tps6524x *hw, int reg)
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{
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int error = 0;
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u16 cmd = CMD_READ(reg), in;
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u8 status;
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struct spi_message m;
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struct spi_transfer t[3];
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spi_message_init(&m);
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memset(t, 0, sizeof(t));
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t[0].tx_buf = &cmd;
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t[0].len = 2;
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t[0].bits_per_word = 12;
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spi_message_add_tail(&t[0], &m);
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t[1].rx_buf = ∈
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t[1].len = 2;
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t[1].bits_per_word = 16;
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spi_message_add_tail(&t[1], &m);
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t[2].rx_buf = &status;
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t[2].len = 1;
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t[2].bits_per_word = 4;
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spi_message_add_tail(&t[2], &m);
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error = spi_sync(hw->spi, &m);
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if (error < 0)
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return error;
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dev_dbg(hw->dev, "read reg %d, data %x, status %x\n",
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reg, in, status);
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if (!(status & STAT_CLK) || (status & STAT_WRITE))
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return -EIO;
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if (status & STAT_INVALID)
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return -EINVAL;
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return in;
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}
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static int read_reg(struct tps6524x *hw, int reg)
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{
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int ret;
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mutex_lock(&hw->lock);
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ret = __read_reg(hw, reg);
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mutex_unlock(&hw->lock);
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return ret;
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}
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static int __write_reg(struct tps6524x *hw, int reg, int val)
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{
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int error = 0;
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u16 cmd = CMD_WRITE(reg), out = val;
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u8 status;
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struct spi_message m;
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struct spi_transfer t[3];
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spi_message_init(&m);
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memset(t, 0, sizeof(t));
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t[0].tx_buf = &cmd;
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t[0].len = 2;
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t[0].bits_per_word = 12;
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spi_message_add_tail(&t[0], &m);
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t[1].tx_buf = &out;
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t[1].len = 2;
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t[1].bits_per_word = 16;
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spi_message_add_tail(&t[1], &m);
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t[2].rx_buf = &status;
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t[2].len = 1;
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t[2].bits_per_word = 4;
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spi_message_add_tail(&t[2], &m);
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error = spi_sync(hw->spi, &m);
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if (error < 0)
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return error;
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dev_dbg(hw->dev, "wrote reg %d, data %x, status %x\n",
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reg, out, status);
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if (!(status & STAT_CLK) || !(status & STAT_WRITE))
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return -EIO;
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if (status & (STAT_INVALID | STAT_WP))
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return -EINVAL;
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return error;
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}
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static int __rmw_reg(struct tps6524x *hw, int reg, int mask, int val)
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{
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int ret;
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ret = __read_reg(hw, reg);
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if (ret < 0)
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return ret;
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ret &= ~mask;
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ret |= val;
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ret = __write_reg(hw, reg, ret);
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return (ret < 0) ? ret : 0;
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}
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static int rmw_protect(struct tps6524x *hw, int reg, int mask, int val)
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{
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int ret;
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mutex_lock(&hw->lock);
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ret = __write_reg(hw, REG_WRITE_ENABLE, 1);
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if (ret) {
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dev_err(hw->dev, "failed to set write enable\n");
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goto error;
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}
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ret = __rmw_reg(hw, reg, mask, val);
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if (ret)
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dev_err(hw->dev, "failed to rmw register %d\n", reg);
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ret = __write_reg(hw, REG_WRITE_ENABLE, 0);
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if (ret) {
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dev_err(hw->dev, "failed to clear write enable\n");
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goto error;
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}
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error:
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mutex_unlock(&hw->lock);
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return ret;
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}
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static int read_field(struct tps6524x *hw, const struct field *field)
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{
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int tmp;
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tmp = read_reg(hw, field->reg);
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if (tmp < 0)
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return tmp;
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return (tmp >> field->shift) & field->mask;
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}
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static int write_field(struct tps6524x *hw, const struct field *field,
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int val)
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{
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if (val & ~field->mask)
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return -EOVERFLOW;
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return rmw_protect(hw, field->reg,
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field->mask << field->shift,
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val << field->shift);
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}
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static const int dcdc1_voltages[] = {
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800000, 825000, 850000, 875000,
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900000, 925000, 950000, 975000,
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1000000, 1025000, 1050000, 1075000,
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1100000, 1125000, 1150000, 1175000,
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1200000, 1225000, 1250000, 1275000,
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1300000, 1325000, 1350000, 1375000,
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1400000, 1425000, 1450000, 1475000,
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1500000, 1525000, 1550000, 1575000,
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};
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static const int dcdc2_voltages[] = {
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1400000, 1450000, 1500000, 1550000,
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1600000, 1650000, 1700000, 1750000,
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1800000, 1850000, 1900000, 1950000,
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2000000, 2050000, 2100000, 2150000,
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2200000, 2250000, 2300000, 2350000,
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2400000, 2450000, 2500000, 2550000,
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2600000, 2650000, 2700000, 2750000,
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2800000, 2850000, 2900000, 2950000,
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};
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static const int dcdc3_voltages[] = {
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2400000, 2450000, 2500000, 2550000, 2600000,
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2650000, 2700000, 2750000, 2800000, 2850000,
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2900000, 2950000, 3000000, 3050000, 3100000,
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3150000, 3200000, 3250000, 3300000, 3350000,
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3400000, 3450000, 3500000, 3550000, 3600000,
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};
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static const int ldo1_voltages[] = {
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4300000, 4350000, 4400000, 4450000,
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4500000, 4550000, 4600000, 4650000,
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4700000, 4750000, 4800000, 4850000,
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4900000, 4950000, 5000000, 5050000,
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};
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static const int ldo2_voltages[] = {
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1100000, 1150000, 1200000, 1250000,
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1300000, 1700000, 1750000, 1800000,
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1850000, 1900000, 3150000, 3200000,
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3250000, 3300000, 3350000, 3400000,
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};
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static const int ldo_ilimsel[] = {
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400000, 1500000
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};
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static const int usb_ilimsel[] = {
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200000, 400000, 800000, 1000000
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};
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#define __MK_FIELD(_reg, _mask, _shift) \
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{ .reg = (_reg), .mask = (_mask), .shift = (_shift), }
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static const struct supply_info supply_info[N_REGULATORS] = {
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{
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.name = "DCDC1",
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.flags = FIXED_ILIMSEL,
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.n_voltages = ARRAY_SIZE(dcdc1_voltages),
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.voltages = dcdc1_voltages,
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.fixed_ilimsel = 2400000,
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.enable = __MK_FIELD(REG_DCDC_EN, DCDCDCDC_EN_MASK,
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DCDCDCDC1_EN_SHIFT),
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.voltage = __MK_FIELD(REG_DCDC_SET, DCDC_VDCDC_MASK,
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DCDC_VDCDC1_SHIFT),
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},
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{
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.name = "DCDC2",
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.flags = FIXED_ILIMSEL,
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.n_voltages = ARRAY_SIZE(dcdc2_voltages),
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.voltages = dcdc2_voltages,
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.fixed_ilimsel = 1200000,
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.enable = __MK_FIELD(REG_DCDC_EN, DCDCDCDC_EN_MASK,
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DCDCDCDC2_EN_SHIFT),
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.voltage = __MK_FIELD(REG_DCDC_SET, DCDC_VDCDC_MASK,
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DCDC_VDCDC2_SHIFT),
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},
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{
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.name = "DCDC3",
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.flags = FIXED_ILIMSEL,
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.n_voltages = ARRAY_SIZE(dcdc3_voltages),
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.voltages = dcdc3_voltages,
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.fixed_ilimsel = 1200000,
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.enable = __MK_FIELD(REG_DCDC_EN, DCDCDCDC_EN_MASK,
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DCDCDCDC3_EN_SHIFT),
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.voltage = __MK_FIELD(REG_DCDC_SET, DCDC_VDCDC_MASK,
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DCDC_VDCDC3_SHIFT),
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},
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{
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.name = "LDO1",
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.n_voltages = ARRAY_SIZE(ldo1_voltages),
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.voltages = ldo1_voltages,
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.n_ilimsels = ARRAY_SIZE(ldo_ilimsel),
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.ilimsels = ldo_ilimsel,
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.enable = __MK_FIELD(REG_BLOCK_EN, BLOCK_MASK,
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BLOCK_LDO1_SHIFT),
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.voltage = __MK_FIELD(REG_LDO_SET, LDO_VSEL_MASK,
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LDO1_VSEL_SHIFT),
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.ilimsel = __MK_FIELD(REG_LDO_SET, LDO_ILIM_MASK,
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LDO1_ILIM_SHIFT),
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},
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{
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.name = "LDO2",
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.n_voltages = ARRAY_SIZE(ldo2_voltages),
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.voltages = ldo2_voltages,
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.n_ilimsels = ARRAY_SIZE(ldo_ilimsel),
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.ilimsels = ldo_ilimsel,
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.enable = __MK_FIELD(REG_BLOCK_EN, BLOCK_MASK,
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BLOCK_LDO2_SHIFT),
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.voltage = __MK_FIELD(REG_LDO_SET, LDO_VSEL_MASK,
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LDO2_VSEL_SHIFT),
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.ilimsel = __MK_FIELD(REG_LDO_SET, LDO_ILIM_MASK,
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LDO2_ILIM_SHIFT),
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},
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{
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.name = "USB",
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.flags = FIXED_VOLTAGE,
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.fixed_voltage = 5000000,
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.n_ilimsels = ARRAY_SIZE(usb_ilimsel),
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.ilimsels = usb_ilimsel,
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.enable = __MK_FIELD(REG_BLOCK_EN, BLOCK_MASK,
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BLOCK_USB_SHIFT),
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.ilimsel = __MK_FIELD(REG_USB, USB_ILIM_MASK,
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USB_ILIM_SHIFT),
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},
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{
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.name = "LCD",
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.flags = FIXED_VOLTAGE | FIXED_ILIMSEL,
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.fixed_voltage = 5000000,
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.fixed_ilimsel = 400000,
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.enable = __MK_FIELD(REG_BLOCK_EN, BLOCK_MASK,
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BLOCK_LCD_SHIFT),
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},
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};
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static int list_voltage(struct regulator_dev *rdev, unsigned selector)
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{
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const struct supply_info *info;
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struct tps6524x *hw;
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hw = rdev_get_drvdata(rdev);
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info = &supply_info[rdev_get_id(rdev)];
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if (info->flags & FIXED_VOLTAGE)
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return selector ? -EINVAL : info->fixed_voltage;
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return ((selector < info->n_voltages) ?
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info->voltages[selector] : -EINVAL);
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}
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static int set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV,
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unsigned *selector)
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{
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const struct supply_info *info;
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struct tps6524x *hw;
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unsigned i;
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hw = rdev_get_drvdata(rdev);
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info = &supply_info[rdev_get_id(rdev)];
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if (info->flags & FIXED_VOLTAGE)
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return -EINVAL;
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for (i = 0; i < info->n_voltages; i++)
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if (min_uV <= info->voltages[i] &&
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max_uV >= info->voltages[i])
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break;
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if (i >= info->n_voltages)
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i = info->n_voltages - 1;
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*selector = info->voltages[i];
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return write_field(hw, &info->voltage, i);
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}
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static int get_voltage(struct regulator_dev *rdev)
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{
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const struct supply_info *info;
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struct tps6524x *hw;
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int ret;
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hw = rdev_get_drvdata(rdev);
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info = &supply_info[rdev_get_id(rdev)];
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if (info->flags & FIXED_VOLTAGE)
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return info->fixed_voltage;
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ret = read_field(hw, &info->voltage);
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if (ret < 0)
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return ret;
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if (WARN_ON(ret >= info->n_voltages))
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return -EIO;
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return info->voltages[ret];
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}
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static int set_current_limit(struct regulator_dev *rdev, int min_uA,
|
|
int max_uA)
|
|
{
|
|
const struct supply_info *info;
|
|
struct tps6524x *hw;
|
|
int i;
|
|
|
|
hw = rdev_get_drvdata(rdev);
|
|
info = &supply_info[rdev_get_id(rdev)];
|
|
|
|
if (info->flags & FIXED_ILIMSEL)
|
|
return -EINVAL;
|
|
|
|
for (i = 0; i < info->n_ilimsels; i++)
|
|
if (min_uA <= info->ilimsels[i] &&
|
|
max_uA >= info->ilimsels[i])
|
|
break;
|
|
|
|
if (i >= info->n_ilimsels)
|
|
return -EINVAL;
|
|
|
|
return write_field(hw, &info->ilimsel, i);
|
|
}
|
|
|
|
static int get_current_limit(struct regulator_dev *rdev)
|
|
{
|
|
const struct supply_info *info;
|
|
struct tps6524x *hw;
|
|
int ret;
|
|
|
|
hw = rdev_get_drvdata(rdev);
|
|
info = &supply_info[rdev_get_id(rdev)];
|
|
|
|
if (info->flags & FIXED_ILIMSEL)
|
|
return info->fixed_ilimsel;
|
|
|
|
ret = read_field(hw, &info->ilimsel);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (WARN_ON(ret >= info->n_ilimsels))
|
|
return -EIO;
|
|
|
|
return info->ilimsels[ret];
|
|
}
|
|
|
|
static int enable_supply(struct regulator_dev *rdev)
|
|
{
|
|
const struct supply_info *info;
|
|
struct tps6524x *hw;
|
|
|
|
hw = rdev_get_drvdata(rdev);
|
|
info = &supply_info[rdev_get_id(rdev)];
|
|
|
|
return write_field(hw, &info->enable, 1);
|
|
}
|
|
|
|
static int disable_supply(struct regulator_dev *rdev)
|
|
{
|
|
const struct supply_info *info;
|
|
struct tps6524x *hw;
|
|
|
|
hw = rdev_get_drvdata(rdev);
|
|
info = &supply_info[rdev_get_id(rdev)];
|
|
|
|
return write_field(hw, &info->enable, 0);
|
|
}
|
|
|
|
static int is_supply_enabled(struct regulator_dev *rdev)
|
|
{
|
|
const struct supply_info *info;
|
|
struct tps6524x *hw;
|
|
|
|
hw = rdev_get_drvdata(rdev);
|
|
info = &supply_info[rdev_get_id(rdev)];
|
|
|
|
return read_field(hw, &info->enable);
|
|
}
|
|
|
|
static struct regulator_ops regulator_ops = {
|
|
.is_enabled = is_supply_enabled,
|
|
.enable = enable_supply,
|
|
.disable = disable_supply,
|
|
.get_voltage = get_voltage,
|
|
.set_voltage = set_voltage,
|
|
.list_voltage = list_voltage,
|
|
.set_current_limit = set_current_limit,
|
|
.get_current_limit = get_current_limit,
|
|
};
|
|
|
|
static int pmic_remove(struct spi_device *spi)
|
|
{
|
|
struct tps6524x *hw = spi_get_drvdata(spi);
|
|
int i;
|
|
|
|
if (!hw)
|
|
return 0;
|
|
for (i = 0; i < N_REGULATORS; i++) {
|
|
if (hw->rdev[i])
|
|
regulator_unregister(hw->rdev[i]);
|
|
hw->rdev[i] = NULL;
|
|
}
|
|
spi_set_drvdata(spi, NULL);
|
|
kfree(hw);
|
|
return 0;
|
|
}
|
|
|
|
static int __devinit pmic_probe(struct spi_device *spi)
|
|
{
|
|
struct tps6524x *hw;
|
|
struct device *dev = &spi->dev;
|
|
const struct supply_info *info = supply_info;
|
|
struct regulator_init_data *init_data;
|
|
int ret = 0, i;
|
|
|
|
init_data = dev->platform_data;
|
|
if (!init_data) {
|
|
dev_err(dev, "could not find regulator platform data\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
hw = kzalloc(sizeof(struct tps6524x), GFP_KERNEL);
|
|
if (!hw) {
|
|
dev_err(dev, "cannot allocate regulator private data\n");
|
|
return -ENOMEM;
|
|
}
|
|
spi_set_drvdata(spi, hw);
|
|
|
|
memset(hw, 0, sizeof(struct tps6524x));
|
|
hw->dev = dev;
|
|
hw->spi = spi_dev_get(spi);
|
|
mutex_init(&hw->lock);
|
|
|
|
for (i = 0; i < N_REGULATORS; i++, info++, init_data++) {
|
|
hw->desc[i].name = info->name;
|
|
hw->desc[i].id = i;
|
|
hw->desc[i].n_voltages = info->n_voltages;
|
|
hw->desc[i].ops = ®ulator_ops;
|
|
hw->desc[i].type = REGULATOR_VOLTAGE;
|
|
hw->desc[i].owner = THIS_MODULE;
|
|
|
|
if (info->flags & FIXED_VOLTAGE)
|
|
hw->desc[i].n_voltages = 1;
|
|
|
|
hw->rdev[i] = regulator_register(&hw->desc[i], dev,
|
|
init_data, hw, NULL);
|
|
if (IS_ERR(hw->rdev[i])) {
|
|
ret = PTR_ERR(hw->rdev[i]);
|
|
hw->rdev[i] = NULL;
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
pmic_remove(spi);
|
|
return ret;
|
|
}
|
|
|
|
static struct spi_driver pmic_driver = {
|
|
.probe = pmic_probe,
|
|
.remove = __devexit_p(pmic_remove),
|
|
.driver = {
|
|
.name = "tps6524x",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
static int __init pmic_driver_init(void)
|
|
{
|
|
return spi_register_driver(&pmic_driver);
|
|
}
|
|
module_init(pmic_driver_init);
|
|
|
|
static void __exit pmic_driver_exit(void)
|
|
{
|
|
spi_unregister_driver(&pmic_driver);
|
|
}
|
|
module_exit(pmic_driver_exit);
|
|
|
|
MODULE_DESCRIPTION("TPS6524X PMIC Driver");
|
|
MODULE_AUTHOR("Cyril Chemparathy");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("spi:tps6524x");
|