/* * twl-regulator.c -- support regulators in twl4030/twl6030 family chips * * Copyright (C) 2008 David Brownell * * 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. */ #include <linux/module.h> #include <linux/string.h> #include <linux/slab.h> #include <linux/init.h> #include <linux/err.h> #include <linux/platform_device.h> #include <linux/of.h> #include <linux/of_device.h> #include <linux/regulator/driver.h> #include <linux/regulator/machine.h> #include <linux/regulator/of_regulator.h> #include <linux/mfd/twl.h> #include <linux/delay.h> /* * The TWL4030/TW5030/TPS659x0 family chips include power management, a * USB OTG transceiver, an RTC, ADC, PWM, and lots more. Some versions * include an audio codec, battery charger, and more voltage regulators. * These chips are often used in OMAP-based systems. * * This driver implements software-based resource control for various * voltage regulators. This is usually augmented with state machine * based control. */ struct twlreg_info { /* start of regulator's PM_RECEIVER control register bank */ u8 base; /* twl resource ID, for resource control state machine */ u8 id; /* voltage in mV = table[VSEL]; table_len must be a power-of-two */ u8 table_len; const u16 *table; /* State REMAP default configuration */ u8 remap; /* used by regulator core */ struct regulator_desc desc; /* chip specific features */ unsigned long features; /* data passed from board for external get/set voltage */ void *data; }; /* LDO control registers ... offset is from the base of its register bank. * The first three registers of all power resource banks help hardware to * manage the various resource groups. */ /* Common offset in TWL4030/6030 */ #define VREG_GRP 0 /* TWL4030 register offsets */ #define VREG_TYPE 1 #define VREG_REMAP 2 #define VREG_DEDICATED 3 /* LDO control */ #define VREG_VOLTAGE_SMPS_4030 9 /* TWL6030 register offsets */ #define VREG_TRANS 1 #define VREG_STATE 2 #define VREG_VOLTAGE 3 #define VREG_VOLTAGE_SMPS 4 static inline int twlreg_read(struct twlreg_info *info, unsigned slave_subgp, unsigned offset) { u8 value; int status; status = twl_i2c_read_u8(slave_subgp, &value, info->base + offset); return (status < 0) ? status : value; } static inline int twlreg_write(struct twlreg_info *info, unsigned slave_subgp, unsigned offset, u8 value) { return twl_i2c_write_u8(slave_subgp, value, info->base + offset); } /*----------------------------------------------------------------------*/ /* generic power resource operations, which work on all regulators */ static int twlreg_grp(struct regulator_dev *rdev) { return twlreg_read(rdev_get_drvdata(rdev), TWL_MODULE_PM_RECEIVER, VREG_GRP); } /* * Enable/disable regulators by joining/leaving the P1 (processor) group. * We assume nobody else is updating the DEV_GRP registers. */ /* definition for 4030 family */ #define P3_GRP_4030 BIT(7) /* "peripherals" */ #define P2_GRP_4030 BIT(6) /* secondary processor, modem, etc */ #define P1_GRP_4030 BIT(5) /* CPU/Linux */ /* definition for 6030 family */ #define P3_GRP_6030 BIT(2) /* secondary processor, modem, etc */ #define P2_GRP_6030 BIT(1) /* "peripherals" */ #define P1_GRP_6030 BIT(0) /* CPU/Linux */ static int twl4030reg_is_enabled(struct regulator_dev *rdev) { int state = twlreg_grp(rdev); if (state < 0) return state; return state & P1_GRP_4030; } #define PB_I2C_BUSY BIT(0) #define PB_I2C_BWEN BIT(1) /* Wait until buffer empty/ready to send a word on power bus. */ static int twl4030_wait_pb_ready(void) { int ret; int timeout = 10; u8 val; do { ret = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &val, TWL4030_PM_MASTER_PB_CFG); if (ret < 0) return ret; if (!(val & PB_I2C_BUSY)) return 0; mdelay(1); timeout--; } while (timeout); return -ETIMEDOUT; } /* Send a word over the powerbus */ static int twl4030_send_pb_msg(unsigned msg) { u8 val; int ret; /* save powerbus configuration */ ret = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &val, TWL4030_PM_MASTER_PB_CFG); if (ret < 0) return ret; /* Enable i2c access to powerbus */ ret = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, val | PB_I2C_BWEN, TWL4030_PM_MASTER_PB_CFG); if (ret < 0) return ret; ret = twl4030_wait_pb_ready(); if (ret < 0) return ret; ret = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, msg >> 8, TWL4030_PM_MASTER_PB_WORD_MSB); if (ret < 0) return ret; ret = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, msg & 0xff, TWL4030_PM_MASTER_PB_WORD_LSB); if (ret < 0) return ret; ret = twl4030_wait_pb_ready(); if (ret < 0) return ret; /* Restore powerbus configuration */ return twl_i2c_write_u8(TWL_MODULE_PM_MASTER, val, TWL4030_PM_MASTER_PB_CFG); } static int twl4030reg_enable(struct regulator_dev *rdev) { struct twlreg_info *info = rdev_get_drvdata(rdev); int grp; int ret; grp = twlreg_grp(rdev); if (grp < 0) return grp; grp |= P1_GRP_4030; ret = twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_GRP, grp); return ret; } static int twl4030reg_disable(struct regulator_dev *rdev) { struct twlreg_info *info = rdev_get_drvdata(rdev); int grp; int ret; grp = twlreg_grp(rdev); if (grp < 0) return grp; grp &= ~(P1_GRP_4030 | P2_GRP_4030 | P3_GRP_4030); ret = twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_GRP, grp); return ret; } static int twl4030reg_get_status(struct regulator_dev *rdev) { int state = twlreg_grp(rdev); if (state < 0) return state; state &= 0x0f; /* assume state != WARM_RESET; we'd not be running... */ if (!state) return REGULATOR_STATUS_OFF; return (state & BIT(3)) ? REGULATOR_STATUS_NORMAL : REGULATOR_STATUS_STANDBY; } static int twl4030reg_set_mode(struct regulator_dev *rdev, unsigned mode) { struct twlreg_info *info = rdev_get_drvdata(rdev); unsigned message; /* We can only set the mode through state machine commands... */ switch (mode) { case REGULATOR_MODE_NORMAL: message = MSG_SINGULAR(DEV_GRP_P1, info->id, RES_STATE_ACTIVE); break; case REGULATOR_MODE_STANDBY: message = MSG_SINGULAR(DEV_GRP_P1, info->id, RES_STATE_SLEEP); break; default: return -EINVAL; } return twl4030_send_pb_msg(message); } static inline unsigned int twl4030reg_map_mode(unsigned int mode) { switch (mode) { case RES_STATE_ACTIVE: return REGULATOR_MODE_NORMAL; case RES_STATE_SLEEP: return REGULATOR_MODE_STANDBY; default: return -EINVAL; } } /*----------------------------------------------------------------------*/ /* * Support for adjustable-voltage LDOs uses a four bit (or less) voltage * select field in its control register. We use tables indexed by VSEL * to record voltages in milliVolts. (Accuracy is about three percent.) * * Note that VSEL values for VAUX2 changed in twl5030 and newer silicon; * currently handled by listing two slightly different VAUX2 regulators, * only one of which will be configured. * * VSEL values documented as "TI cannot support these values" are flagged * in these tables as UNSUP() values; we normally won't assign them. * * VAUX3 at 3V is incorrectly listed in some TI manuals as unsupported. * TI are revising the twl5030/tps659x0 specs to support that 3.0V setting. */ #define UNSUP_MASK 0x8000 #define UNSUP(x) (UNSUP_MASK | (x)) #define IS_UNSUP(info, x) \ ((UNSUP_MASK & (x)) && \ !((info)->features & TWL4030_ALLOW_UNSUPPORTED)) #define LDO_MV(x) (~UNSUP_MASK & (x)) static const u16 VAUX1_VSEL_table[] = { UNSUP(1500), UNSUP(1800), 2500, 2800, 3000, 3000, 3000, 3000, }; static const u16 VAUX2_4030_VSEL_table[] = { UNSUP(1000), UNSUP(1000), UNSUP(1200), 1300, 1500, 1800, UNSUP(1850), 2500, UNSUP(2600), 2800, UNSUP(2850), UNSUP(3000), UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150), }; static const u16 VAUX2_VSEL_table[] = { 1700, 1700, 1900, 1300, 1500, 1800, 2000, 2500, 2100, 2800, 2200, 2300, 2400, 2400, 2400, 2400, }; static const u16 VAUX3_VSEL_table[] = { 1500, 1800, 2500, 2800, 3000, 3000, 3000, 3000, }; static const u16 VAUX4_VSEL_table[] = { 700, 1000, 1200, UNSUP(1300), 1500, 1800, UNSUP(1850), 2500, UNSUP(2600), 2800, UNSUP(2850), UNSUP(3000), UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150), }; static const u16 VMMC1_VSEL_table[] = { 1850, 2850, 3000, 3150, }; static const u16 VMMC2_VSEL_table[] = { UNSUP(1000), UNSUP(1000), UNSUP(1200), UNSUP(1300), UNSUP(1500), UNSUP(1800), 1850, UNSUP(2500), 2600, 2800, 2850, 3000, 3150, 3150, 3150, 3150, }; static const u16 VPLL1_VSEL_table[] = { 1000, 1200, 1300, 1800, UNSUP(2800), UNSUP(3000), UNSUP(3000), UNSUP(3000), }; static const u16 VPLL2_VSEL_table[] = { 700, 1000, 1200, 1300, UNSUP(1500), 1800, UNSUP(1850), UNSUP(2500), UNSUP(2600), UNSUP(2800), UNSUP(2850), UNSUP(3000), UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150), }; static const u16 VSIM_VSEL_table[] = { UNSUP(1000), UNSUP(1200), UNSUP(1300), 1800, 2800, 3000, 3000, 3000, }; static const u16 VDAC_VSEL_table[] = { 1200, 1300, 1800, 1800, }; static const u16 VIO_VSEL_table[] = { 1800, 1850, }; static const u16 VINTANA2_VSEL_table[] = { 2500, 2750, }; static int twl4030ldo_list_voltage(struct regulator_dev *rdev, unsigned index) { struct twlreg_info *info = rdev_get_drvdata(rdev); int mV = info->table[index]; return IS_UNSUP(info, mV) ? 0 : (LDO_MV(mV) * 1000); } static int twl4030ldo_set_voltage_sel(struct regulator_dev *rdev, unsigned selector) { struct twlreg_info *info = rdev_get_drvdata(rdev); return twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_VOLTAGE, selector); } static int twl4030ldo_get_voltage_sel(struct regulator_dev *rdev) { struct twlreg_info *info = rdev_get_drvdata(rdev); int vsel = twlreg_read(info, TWL_MODULE_PM_RECEIVER, VREG_VOLTAGE); if (vsel < 0) return vsel; vsel &= info->table_len - 1; return vsel; } static struct regulator_ops twl4030ldo_ops = { .list_voltage = twl4030ldo_list_voltage, .set_voltage_sel = twl4030ldo_set_voltage_sel, .get_voltage_sel = twl4030ldo_get_voltage_sel, .enable = twl4030reg_enable, .disable = twl4030reg_disable, .is_enabled = twl4030reg_is_enabled, .set_mode = twl4030reg_set_mode, .get_status = twl4030reg_get_status, }; static int twl4030smps_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV, unsigned *selector) { struct twlreg_info *info = rdev_get_drvdata(rdev); int vsel = DIV_ROUND_UP(min_uV - 600000, 12500); twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_VOLTAGE_SMPS_4030, vsel); return 0; } static int twl4030smps_get_voltage(struct regulator_dev *rdev) { struct twlreg_info *info = rdev_get_drvdata(rdev); int vsel; vsel = twlreg_read(info, TWL_MODULE_PM_RECEIVER, VREG_VOLTAGE_SMPS_4030); return vsel * 12500 + 600000; } static struct regulator_ops twl4030smps_ops = { .set_voltage = twl4030smps_set_voltage, .get_voltage = twl4030smps_get_voltage, }; /*----------------------------------------------------------------------*/ static struct regulator_ops twl4030fixed_ops = { .list_voltage = regulator_list_voltage_linear, .enable = twl4030reg_enable, .disable = twl4030reg_disable, .is_enabled = twl4030reg_is_enabled, .set_mode = twl4030reg_set_mode, .get_status = twl4030reg_get_status, }; /*----------------------------------------------------------------------*/ #define TWL4030_ADJUSTABLE_LDO(label, offset, num, turnon_delay, remap_conf) \ static const struct twlreg_info TWL4030_INFO_##label = { \ .base = offset, \ .id = num, \ .table_len = ARRAY_SIZE(label##_VSEL_table), \ .table = label##_VSEL_table, \ .remap = remap_conf, \ .desc = { \ .name = #label, \ .id = TWL4030_REG_##label, \ .n_voltages = ARRAY_SIZE(label##_VSEL_table), \ .ops = &twl4030ldo_ops, \ .type = REGULATOR_VOLTAGE, \ .owner = THIS_MODULE, \ .enable_time = turnon_delay, \ .of_map_mode = twl4030reg_map_mode, \ }, \ } #define TWL4030_ADJUSTABLE_SMPS(label, offset, num, turnon_delay, remap_conf) \ static const struct twlreg_info TWL4030_INFO_##label = { \ .base = offset, \ .id = num, \ .remap = remap_conf, \ .desc = { \ .name = #label, \ .id = TWL4030_REG_##label, \ .ops = &twl4030smps_ops, \ .type = REGULATOR_VOLTAGE, \ .owner = THIS_MODULE, \ .enable_time = turnon_delay, \ .of_map_mode = twl4030reg_map_mode, \ }, \ } #define TWL4030_FIXED_LDO(label, offset, mVolts, num, turnon_delay, \ remap_conf) \ static const struct twlreg_info TWLFIXED_INFO_##label = { \ .base = offset, \ .id = num, \ .remap = remap_conf, \ .desc = { \ .name = #label, \ .id = TWL4030##_REG_##label, \ .n_voltages = 1, \ .ops = &twl4030fixed_ops, \ .type = REGULATOR_VOLTAGE, \ .owner = THIS_MODULE, \ .min_uV = mVolts * 1000, \ .enable_time = turnon_delay, \ .of_map_mode = twl4030reg_map_mode, \ }, \ } /* * We list regulators here if systems need some level of * software control over them after boot. */ TWL4030_ADJUSTABLE_LDO(VAUX1, 0x17, 1, 100, 0x08); TWL4030_ADJUSTABLE_LDO(VAUX2_4030, 0x1b, 2, 100, 0x08); TWL4030_ADJUSTABLE_LDO(VAUX2, 0x1b, 2, 100, 0x08); TWL4030_ADJUSTABLE_LDO(VAUX3, 0x1f, 3, 100, 0x08); TWL4030_ADJUSTABLE_LDO(VAUX4, 0x23, 4, 100, 0x08); TWL4030_ADJUSTABLE_LDO(VMMC1, 0x27, 5, 100, 0x08); TWL4030_ADJUSTABLE_LDO(VMMC2, 0x2b, 6, 100, 0x08); TWL4030_ADJUSTABLE_LDO(VPLL1, 0x2f, 7, 100, 0x00); TWL4030_ADJUSTABLE_LDO(VPLL2, 0x33, 8, 100, 0x08); TWL4030_ADJUSTABLE_LDO(VSIM, 0x37, 9, 100, 0x00); TWL4030_ADJUSTABLE_LDO(VDAC, 0x3b, 10, 100, 0x08); TWL4030_ADJUSTABLE_LDO(VINTANA2, 0x43, 12, 100, 0x08); TWL4030_ADJUSTABLE_LDO(VIO, 0x4b, 14, 1000, 0x08); TWL4030_ADJUSTABLE_SMPS(VDD1, 0x55, 15, 1000, 0x08); TWL4030_ADJUSTABLE_SMPS(VDD2, 0x63, 16, 1000, 0x08); /* VUSBCP is managed *only* by the USB subchip */ TWL4030_FIXED_LDO(VINTANA1, 0x3f, 1500, 11, 100, 0x08); TWL4030_FIXED_LDO(VINTDIG, 0x47, 1500, 13, 100, 0x08); TWL4030_FIXED_LDO(VUSB1V5, 0x71, 1500, 17, 100, 0x08); TWL4030_FIXED_LDO(VUSB1V8, 0x74, 1800, 18, 100, 0x08); TWL4030_FIXED_LDO(VUSB3V1, 0x77, 3100, 19, 150, 0x08); #define TWL_OF_MATCH(comp, family, label) \ { \ .compatible = comp, \ .data = &family##_INFO_##label, \ } #define TWL4030_OF_MATCH(comp, label) TWL_OF_MATCH(comp, TWL4030, label) #define TWL6030_OF_MATCH(comp, label) TWL_OF_MATCH(comp, TWL6030, label) #define TWL6032_OF_MATCH(comp, label) TWL_OF_MATCH(comp, TWL6032, label) #define TWLFIXED_OF_MATCH(comp, label) TWL_OF_MATCH(comp, TWLFIXED, label) #define TWLSMPS_OF_MATCH(comp, label) TWL_OF_MATCH(comp, TWLSMPS, label) static const struct of_device_id twl_of_match[] = { TWL4030_OF_MATCH("ti,twl4030-vaux1", VAUX1), TWL4030_OF_MATCH("ti,twl4030-vaux2", VAUX2_4030), TWL4030_OF_MATCH("ti,twl5030-vaux2", VAUX2), TWL4030_OF_MATCH("ti,twl4030-vaux3", VAUX3), TWL4030_OF_MATCH("ti,twl4030-vaux4", VAUX4), TWL4030_OF_MATCH("ti,twl4030-vmmc1", VMMC1), TWL4030_OF_MATCH("ti,twl4030-vmmc2", VMMC2), TWL4030_OF_MATCH("ti,twl4030-vpll1", VPLL1), TWL4030_OF_MATCH("ti,twl4030-vpll2", VPLL2), TWL4030_OF_MATCH("ti,twl4030-vsim", VSIM), TWL4030_OF_MATCH("ti,twl4030-vdac", VDAC), TWL4030_OF_MATCH("ti,twl4030-vintana2", VINTANA2), TWL4030_OF_MATCH("ti,twl4030-vio", VIO), TWL4030_OF_MATCH("ti,twl4030-vdd1", VDD1), TWL4030_OF_MATCH("ti,twl4030-vdd2", VDD2), TWLFIXED_OF_MATCH("ti,twl4030-vintana1", VINTANA1), TWLFIXED_OF_MATCH("ti,twl4030-vintdig", VINTDIG), TWLFIXED_OF_MATCH("ti,twl4030-vusb1v5", VUSB1V5), TWLFIXED_OF_MATCH("ti,twl4030-vusb1v8", VUSB1V8), TWLFIXED_OF_MATCH("ti,twl4030-vusb3v1", VUSB3V1), {}, }; MODULE_DEVICE_TABLE(of, twl_of_match); static int twlreg_probe(struct platform_device *pdev) { int id; struct twlreg_info *info; const struct twlreg_info *template; struct regulator_init_data *initdata; struct regulation_constraints *c; struct regulator_dev *rdev; const struct of_device_id *match; struct regulator_config config = { }; match = of_match_device(twl_of_match, &pdev->dev); if (!match) return -ENODEV; template = match->data; if (!template) return -ENODEV; id = template->desc.id; initdata = of_get_regulator_init_data(&pdev->dev, pdev->dev.of_node, &template->desc); if (!initdata) return -EINVAL; info = devm_kmemdup(&pdev->dev, template, sizeof(*info), GFP_KERNEL); if (!info) return -ENOMEM; /* Constrain board-specific capabilities according to what * this driver and the chip itself can actually do. */ c = &initdata->constraints; c->valid_modes_mask &= REGULATOR_MODE_NORMAL | REGULATOR_MODE_STANDBY; c->valid_ops_mask &= REGULATOR_CHANGE_VOLTAGE | REGULATOR_CHANGE_MODE | REGULATOR_CHANGE_STATUS; switch (id) { case TWL4030_REG_VIO: case TWL4030_REG_VDD1: case TWL4030_REG_VDD2: case TWL4030_REG_VPLL1: case TWL4030_REG_VINTANA1: case TWL4030_REG_VINTANA2: case TWL4030_REG_VINTDIG: c->always_on = true; break; default: break; } config.dev = &pdev->dev; config.init_data = initdata; config.driver_data = info; config.of_node = pdev->dev.of_node; rdev = devm_regulator_register(&pdev->dev, &info->desc, &config); if (IS_ERR(rdev)) { dev_err(&pdev->dev, "can't register %s, %ld\n", info->desc.name, PTR_ERR(rdev)); return PTR_ERR(rdev); } platform_set_drvdata(pdev, rdev); twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_REMAP, info->remap); /* NOTE: many regulators support short-circuit IRQs (presentable * as REGULATOR_OVER_CURRENT notifications?) configured via: * - SC_CONFIG * - SC_DETECT1 (vintana2, vmmc1/2, vaux1/2/3/4) * - SC_DETECT2 (vusb, vdac, vio, vdd1/2, vpll2) * - IT_CONFIG */ return 0; } MODULE_ALIAS("platform:twl4030_reg"); static struct platform_driver twlreg_driver = { .probe = twlreg_probe, /* NOTE: short name, to work around driver model truncation of * "twl_regulator.12" (and friends) to "twl_regulator.1". */ .driver = { .name = "twl4030_reg", .of_match_table = of_match_ptr(twl_of_match), }, }; static int __init twlreg_init(void) { return platform_driver_register(&twlreg_driver); } subsys_initcall(twlreg_init); static void __exit twlreg_exit(void) { platform_driver_unregister(&twlreg_driver); } module_exit(twlreg_exit) MODULE_DESCRIPTION("TWL4030 regulator driver"); MODULE_LICENSE("GPL");