555 lines
13 KiB
C
555 lines
13 KiB
C
/*
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* TI LP8788 MFD - buck regulator driver
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*
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* Copyright 2012 Texas Instruments
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*
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* Author: Milo(Woogyom) Kim <milo.kim@ti.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/err.h>
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#include <linux/platform_device.h>
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#include <linux/regulator/driver.h>
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#include <linux/mfd/lp8788.h>
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#include <linux/gpio.h>
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/* register address */
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#define LP8788_EN_BUCK 0x0C
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#define LP8788_BUCK_DVS_SEL 0x1D
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#define LP8788_BUCK1_VOUT0 0x1E
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#define LP8788_BUCK1_VOUT1 0x1F
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#define LP8788_BUCK1_VOUT2 0x20
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#define LP8788_BUCK1_VOUT3 0x21
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#define LP8788_BUCK2_VOUT0 0x22
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#define LP8788_BUCK2_VOUT1 0x23
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#define LP8788_BUCK2_VOUT2 0x24
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#define LP8788_BUCK2_VOUT3 0x25
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#define LP8788_BUCK3_VOUT 0x26
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#define LP8788_BUCK4_VOUT 0x27
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#define LP8788_BUCK1_TIMESTEP 0x28
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#define LP8788_BUCK_PWM 0x2D
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/* mask/shift bits */
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#define LP8788_EN_BUCK1_M BIT(0) /* Addr 0Ch */
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#define LP8788_EN_BUCK2_M BIT(1)
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#define LP8788_EN_BUCK3_M BIT(2)
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#define LP8788_EN_BUCK4_M BIT(3)
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#define LP8788_BUCK1_DVS_SEL_M 0x04 /* Addr 1Dh */
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#define LP8788_BUCK1_DVS_M 0x03
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#define LP8788_BUCK1_DVS_S 0
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#define LP8788_BUCK2_DVS_SEL_M 0x40
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#define LP8788_BUCK2_DVS_M 0x30
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#define LP8788_BUCK2_DVS_S 4
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#define LP8788_BUCK1_DVS_I2C BIT(2)
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#define LP8788_BUCK2_DVS_I2C BIT(6)
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#define LP8788_BUCK1_DVS_PIN (0 << 2)
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#define LP8788_BUCK2_DVS_PIN (0 << 6)
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#define LP8788_VOUT_M 0x1F /* Addr 1Eh ~ 27h */
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#define LP8788_STARTUP_TIME_M 0xF8 /* Addr 28h ~ 2Bh */
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#define LP8788_STARTUP_TIME_S 3
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#define LP8788_FPWM_BUCK1_M BIT(0) /* Addr 2Dh */
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#define LP8788_FPWM_BUCK1_S 0
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#define LP8788_FPWM_BUCK2_M BIT(1)
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#define LP8788_FPWM_BUCK2_S 1
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#define LP8788_FPWM_BUCK3_M BIT(2)
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#define LP8788_FPWM_BUCK3_S 2
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#define LP8788_FPWM_BUCK4_M BIT(3)
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#define LP8788_FPWM_BUCK4_S 3
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#define INVALID_ADDR 0xFF
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#define LP8788_FORCE_PWM 1
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#define LP8788_AUTO_PWM 0
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#define PIN_LOW 0
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#define PIN_HIGH 1
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#define ENABLE_TIME_USEC 32
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#define BUCK_FPWM_MASK(x) (1 << (x))
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#define BUCK_FPWM_SHIFT(x) (x)
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enum lp8788_dvs_state {
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DVS_LOW = GPIOF_OUT_INIT_LOW,
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DVS_HIGH = GPIOF_OUT_INIT_HIGH,
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};
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enum lp8788_dvs_mode {
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REGISTER,
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EXTPIN,
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};
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enum lp8788_buck_id {
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BUCK1,
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BUCK2,
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BUCK3,
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BUCK4,
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};
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struct lp8788_buck {
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struct lp8788 *lp;
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struct regulator_dev *regulator;
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void *dvs;
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};
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/* BUCK 1 ~ 4 voltage table */
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static const int lp8788_buck_vtbl[] = {
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500000, 800000, 850000, 900000, 950000, 1000000, 1050000, 1100000,
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1150000, 1200000, 1250000, 1300000, 1350000, 1400000, 1450000, 1500000,
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1550000, 1600000, 1650000, 1700000, 1750000, 1800000, 1850000, 1900000,
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1950000, 2000000,
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};
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static void lp8788_buck1_set_dvs(struct lp8788_buck *buck)
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{
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struct lp8788_buck1_dvs *dvs = (struct lp8788_buck1_dvs *)buck->dvs;
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enum lp8788_dvs_state pinstate;
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if (!dvs)
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return;
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pinstate = dvs->vsel == DVS_SEL_V0 ? DVS_LOW : DVS_HIGH;
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if (gpio_is_valid(dvs->gpio))
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gpio_set_value(dvs->gpio, pinstate);
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}
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static void lp8788_buck2_set_dvs(struct lp8788_buck *buck)
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{
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struct lp8788_buck2_dvs *dvs = (struct lp8788_buck2_dvs *)buck->dvs;
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enum lp8788_dvs_state pin1, pin2;
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if (!dvs)
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return;
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switch (dvs->vsel) {
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case DVS_SEL_V0:
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pin1 = DVS_LOW;
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pin2 = DVS_LOW;
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break;
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case DVS_SEL_V1:
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pin1 = DVS_HIGH;
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pin2 = DVS_LOW;
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break;
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case DVS_SEL_V2:
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pin1 = DVS_LOW;
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pin2 = DVS_HIGH;
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break;
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case DVS_SEL_V3:
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pin1 = DVS_HIGH;
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pin2 = DVS_HIGH;
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break;
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default:
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return;
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}
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if (gpio_is_valid(dvs->gpio[0]))
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gpio_set_value(dvs->gpio[0], pin1);
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if (gpio_is_valid(dvs->gpio[1]))
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gpio_set_value(dvs->gpio[1], pin2);
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}
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static void lp8788_set_dvs(struct lp8788_buck *buck, enum lp8788_buck_id id)
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{
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switch (id) {
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case BUCK1:
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lp8788_buck1_set_dvs(buck);
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break;
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case BUCK2:
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lp8788_buck2_set_dvs(buck);
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break;
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default:
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break;
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}
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}
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static enum lp8788_dvs_mode
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lp8788_get_buck_dvs_ctrl_mode(struct lp8788_buck *buck, enum lp8788_buck_id id)
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{
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u8 val, mask;
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switch (id) {
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case BUCK1:
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mask = LP8788_BUCK1_DVS_SEL_M;
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break;
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case BUCK2:
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mask = LP8788_BUCK2_DVS_SEL_M;
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break;
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default:
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return REGISTER;
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}
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lp8788_read_byte(buck->lp, LP8788_BUCK_DVS_SEL, &val);
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return val & mask ? REGISTER : EXTPIN;
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}
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static bool lp8788_is_valid_buck_addr(u8 addr)
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{
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switch (addr) {
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case LP8788_BUCK1_VOUT0:
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case LP8788_BUCK1_VOUT1:
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case LP8788_BUCK1_VOUT2:
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case LP8788_BUCK1_VOUT3:
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case LP8788_BUCK2_VOUT0:
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case LP8788_BUCK2_VOUT1:
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case LP8788_BUCK2_VOUT2:
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case LP8788_BUCK2_VOUT3:
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return true;
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default:
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return false;
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}
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}
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static u8 lp8788_select_buck_vout_addr(struct lp8788_buck *buck,
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enum lp8788_buck_id id)
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{
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enum lp8788_dvs_mode mode = lp8788_get_buck_dvs_ctrl_mode(buck, id);
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struct lp8788_buck1_dvs *b1_dvs;
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struct lp8788_buck2_dvs *b2_dvs;
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u8 val, idx, addr;
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int pin1, pin2;
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switch (id) {
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case BUCK1:
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if (mode == EXTPIN) {
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b1_dvs = (struct lp8788_buck1_dvs *)buck->dvs;
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if (!b1_dvs)
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goto err;
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idx = gpio_get_value(b1_dvs->gpio) ? 1 : 0;
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} else {
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lp8788_read_byte(buck->lp, LP8788_BUCK_DVS_SEL, &val);
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idx = (val & LP8788_BUCK1_DVS_M) >> LP8788_BUCK1_DVS_S;
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}
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addr = LP8788_BUCK1_VOUT0 + idx;
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break;
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case BUCK2:
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if (mode == EXTPIN) {
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b2_dvs = (struct lp8788_buck2_dvs *)buck->dvs;
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if (!b2_dvs)
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goto err;
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pin1 = gpio_get_value(b2_dvs->gpio[0]);
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pin2 = gpio_get_value(b2_dvs->gpio[1]);
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if (pin1 == PIN_LOW && pin2 == PIN_LOW)
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idx = 0;
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else if (pin1 == PIN_LOW && pin2 == PIN_HIGH)
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idx = 2;
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else if (pin1 == PIN_HIGH && pin2 == PIN_LOW)
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idx = 1;
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else
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idx = 3;
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} else {
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lp8788_read_byte(buck->lp, LP8788_BUCK_DVS_SEL, &val);
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idx = (val & LP8788_BUCK2_DVS_M) >> LP8788_BUCK2_DVS_S;
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}
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addr = LP8788_BUCK2_VOUT0 + idx;
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break;
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default:
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goto err;
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}
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return addr;
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err:
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return INVALID_ADDR;
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}
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static int lp8788_buck12_set_voltage_sel(struct regulator_dev *rdev,
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unsigned selector)
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{
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struct lp8788_buck *buck = rdev_get_drvdata(rdev);
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enum lp8788_buck_id id = rdev_get_id(rdev);
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u8 addr;
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if (buck->dvs)
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lp8788_set_dvs(buck, id);
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addr = lp8788_select_buck_vout_addr(buck, id);
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if (!lp8788_is_valid_buck_addr(addr))
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return -EINVAL;
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return lp8788_update_bits(buck->lp, addr, LP8788_VOUT_M, selector);
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}
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static int lp8788_buck12_get_voltage_sel(struct regulator_dev *rdev)
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{
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struct lp8788_buck *buck = rdev_get_drvdata(rdev);
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enum lp8788_buck_id id = rdev_get_id(rdev);
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int ret;
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u8 val, addr;
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addr = lp8788_select_buck_vout_addr(buck, id);
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if (!lp8788_is_valid_buck_addr(addr))
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return -EINVAL;
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ret = lp8788_read_byte(buck->lp, addr, &val);
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if (ret)
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return ret;
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return val & LP8788_VOUT_M;
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}
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static int lp8788_buck_enable_time(struct regulator_dev *rdev)
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{
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struct lp8788_buck *buck = rdev_get_drvdata(rdev);
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enum lp8788_buck_id id = rdev_get_id(rdev);
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u8 val, addr = LP8788_BUCK1_TIMESTEP + id;
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if (lp8788_read_byte(buck->lp, addr, &val))
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return -EINVAL;
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val = (val & LP8788_STARTUP_TIME_M) >> LP8788_STARTUP_TIME_S;
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return ENABLE_TIME_USEC * val;
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}
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static int lp8788_buck_set_mode(struct regulator_dev *rdev, unsigned int mode)
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{
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struct lp8788_buck *buck = rdev_get_drvdata(rdev);
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enum lp8788_buck_id id = rdev_get_id(rdev);
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u8 mask, val;
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mask = BUCK_FPWM_MASK(id);
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switch (mode) {
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case REGULATOR_MODE_FAST:
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val = LP8788_FORCE_PWM << BUCK_FPWM_SHIFT(id);
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break;
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case REGULATOR_MODE_NORMAL:
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val = LP8788_AUTO_PWM << BUCK_FPWM_SHIFT(id);
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break;
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default:
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return -EINVAL;
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}
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return lp8788_update_bits(buck->lp, LP8788_BUCK_PWM, mask, val);
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}
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static unsigned int lp8788_buck_get_mode(struct regulator_dev *rdev)
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{
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struct lp8788_buck *buck = rdev_get_drvdata(rdev);
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enum lp8788_buck_id id = rdev_get_id(rdev);
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u8 val;
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int ret;
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ret = lp8788_read_byte(buck->lp, LP8788_BUCK_PWM, &val);
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if (ret)
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return ret;
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return val & BUCK_FPWM_MASK(id) ?
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REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;
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}
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static struct regulator_ops lp8788_buck12_ops = {
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.list_voltage = regulator_list_voltage_table,
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.map_voltage = regulator_map_voltage_ascend,
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.set_voltage_sel = lp8788_buck12_set_voltage_sel,
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.get_voltage_sel = lp8788_buck12_get_voltage_sel,
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.enable = regulator_enable_regmap,
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.disable = regulator_disable_regmap,
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.is_enabled = regulator_is_enabled_regmap,
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.enable_time = lp8788_buck_enable_time,
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.set_mode = lp8788_buck_set_mode,
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.get_mode = lp8788_buck_get_mode,
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};
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static struct regulator_ops lp8788_buck34_ops = {
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.list_voltage = regulator_list_voltage_table,
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.map_voltage = regulator_map_voltage_ascend,
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.set_voltage_sel = regulator_set_voltage_sel_regmap,
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.get_voltage_sel = regulator_get_voltage_sel_regmap,
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.enable = regulator_enable_regmap,
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.disable = regulator_disable_regmap,
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.is_enabled = regulator_is_enabled_regmap,
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.enable_time = lp8788_buck_enable_time,
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.set_mode = lp8788_buck_set_mode,
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.get_mode = lp8788_buck_get_mode,
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};
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static struct regulator_desc lp8788_buck_desc[] = {
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{
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.name = "buck1",
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.id = BUCK1,
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.ops = &lp8788_buck12_ops,
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.n_voltages = ARRAY_SIZE(lp8788_buck_vtbl),
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.volt_table = lp8788_buck_vtbl,
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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.enable_reg = LP8788_EN_BUCK,
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.enable_mask = LP8788_EN_BUCK1_M,
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},
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{
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.name = "buck2",
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.id = BUCK2,
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.ops = &lp8788_buck12_ops,
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.n_voltages = ARRAY_SIZE(lp8788_buck_vtbl),
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.volt_table = lp8788_buck_vtbl,
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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.enable_reg = LP8788_EN_BUCK,
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.enable_mask = LP8788_EN_BUCK2_M,
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},
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{
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.name = "buck3",
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.id = BUCK3,
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.ops = &lp8788_buck34_ops,
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.n_voltages = ARRAY_SIZE(lp8788_buck_vtbl),
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.volt_table = lp8788_buck_vtbl,
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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.vsel_reg = LP8788_BUCK3_VOUT,
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.vsel_mask = LP8788_VOUT_M,
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.enable_reg = LP8788_EN_BUCK,
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.enable_mask = LP8788_EN_BUCK3_M,
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},
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{
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.name = "buck4",
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.id = BUCK4,
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.ops = &lp8788_buck34_ops,
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.n_voltages = ARRAY_SIZE(lp8788_buck_vtbl),
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.volt_table = lp8788_buck_vtbl,
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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.vsel_reg = LP8788_BUCK4_VOUT,
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.vsel_mask = LP8788_VOUT_M,
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.enable_reg = LP8788_EN_BUCK,
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.enable_mask = LP8788_EN_BUCK4_M,
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},
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};
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static int lp8788_dvs_gpio_request(struct platform_device *pdev,
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struct lp8788_buck *buck,
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enum lp8788_buck_id id)
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{
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struct lp8788_platform_data *pdata = buck->lp->pdata;
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char *b1_name = "LP8788_B1_DVS";
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char *b2_name[] = { "LP8788_B2_DVS1", "LP8788_B2_DVS2" };
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int i, gpio, ret;
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switch (id) {
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case BUCK1:
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gpio = pdata->buck1_dvs->gpio;
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ret = devm_gpio_request_one(&pdev->dev, gpio, DVS_LOW,
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b1_name);
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if (ret)
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return ret;
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buck->dvs = pdata->buck1_dvs;
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break;
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case BUCK2:
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for (i = 0; i < LP8788_NUM_BUCK2_DVS; i++) {
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gpio = pdata->buck2_dvs->gpio[i];
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ret = devm_gpio_request_one(&pdev->dev, gpio,
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DVS_LOW, b2_name[i]);
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if (ret)
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return ret;
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}
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buck->dvs = pdata->buck2_dvs;
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break;
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default:
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break;
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}
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return 0;
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}
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static int lp8788_init_dvs(struct platform_device *pdev,
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struct lp8788_buck *buck, enum lp8788_buck_id id)
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{
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struct lp8788_platform_data *pdata = buck->lp->pdata;
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u8 mask[] = { LP8788_BUCK1_DVS_SEL_M, LP8788_BUCK2_DVS_SEL_M };
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u8 val[] = { LP8788_BUCK1_DVS_PIN, LP8788_BUCK2_DVS_PIN };
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u8 default_dvs_mode[] = { LP8788_BUCK1_DVS_I2C, LP8788_BUCK2_DVS_I2C };
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/* no dvs for buck3, 4 */
|
|
if (id > BUCK2)
|
|
return 0;
|
|
|
|
/* no dvs platform data, then dvs will be selected by I2C registers */
|
|
if (!pdata)
|
|
goto set_default_dvs_mode;
|
|
|
|
if ((id == BUCK1 && !pdata->buck1_dvs) ||
|
|
(id == BUCK2 && !pdata->buck2_dvs))
|
|
goto set_default_dvs_mode;
|
|
|
|
if (lp8788_dvs_gpio_request(pdev, buck, id))
|
|
goto set_default_dvs_mode;
|
|
|
|
return lp8788_update_bits(buck->lp, LP8788_BUCK_DVS_SEL, mask[id],
|
|
val[id]);
|
|
|
|
set_default_dvs_mode:
|
|
return lp8788_update_bits(buck->lp, LP8788_BUCK_DVS_SEL, mask[id],
|
|
default_dvs_mode[id]);
|
|
}
|
|
|
|
static int lp8788_buck_probe(struct platform_device *pdev)
|
|
{
|
|
struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent);
|
|
int id = pdev->id;
|
|
struct lp8788_buck *buck;
|
|
struct regulator_config cfg = { };
|
|
struct regulator_dev *rdev;
|
|
int ret;
|
|
|
|
if (id >= LP8788_NUM_BUCKS)
|
|
return -EINVAL;
|
|
|
|
buck = devm_kzalloc(&pdev->dev, sizeof(struct lp8788_buck), GFP_KERNEL);
|
|
if (!buck)
|
|
return -ENOMEM;
|
|
|
|
buck->lp = lp;
|
|
|
|
ret = lp8788_init_dvs(pdev, buck, id);
|
|
if (ret)
|
|
return ret;
|
|
|
|
cfg.dev = pdev->dev.parent;
|
|
cfg.init_data = lp->pdata ? lp->pdata->buck_data[id] : NULL;
|
|
cfg.driver_data = buck;
|
|
cfg.regmap = lp->regmap;
|
|
|
|
rdev = devm_regulator_register(&pdev->dev, &lp8788_buck_desc[id], &cfg);
|
|
if (IS_ERR(rdev)) {
|
|
ret = PTR_ERR(rdev);
|
|
dev_err(&pdev->dev, "BUCK%d regulator register err = %d\n",
|
|
id + 1, ret);
|
|
return ret;
|
|
}
|
|
|
|
buck->regulator = rdev;
|
|
platform_set_drvdata(pdev, buck);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver lp8788_buck_driver = {
|
|
.probe = lp8788_buck_probe,
|
|
.driver = {
|
|
.name = LP8788_DEV_BUCK,
|
|
},
|
|
};
|
|
|
|
static int __init lp8788_buck_init(void)
|
|
{
|
|
return platform_driver_register(&lp8788_buck_driver);
|
|
}
|
|
subsys_initcall(lp8788_buck_init);
|
|
|
|
static void __exit lp8788_buck_exit(void)
|
|
{
|
|
platform_driver_unregister(&lp8788_buck_driver);
|
|
}
|
|
module_exit(lp8788_buck_exit);
|
|
|
|
MODULE_DESCRIPTION("TI LP8788 BUCK Driver");
|
|
MODULE_AUTHOR("Milo Kim");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:lp8788-buck");
|