diff options
Diffstat (limited to 'drivers/regulator/twl-regulator.c')
| -rw-r--r-- | drivers/regulator/twl-regulator.c | 579 |
1 files changed, 579 insertions, 0 deletions
diff --git a/drivers/regulator/twl-regulator.c b/drivers/regulator/twl-regulator.c new file mode 100644 index 00000000000..7ea1c3a3108 --- /dev/null +++ b/drivers/regulator/twl-regulator.c @@ -0,0 +1,579 @@ +/* + * 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/init.h> +#include <linux/err.h> +#include <linux/platform_device.h> +#include <linux/regulator/driver.h> +#include <linux/regulator/machine.h> +#include <linux/i2c/twl.h> + + +/* + * The TWL4030/TW5030/TPS659x0/TWL6030 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; + + /* chip constraints on regulator behavior */ + u16 min_mV; + + /* used by regulator core */ + struct regulator_desc desc; +}; + + +/* 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 */ +/* TWL6030 register offsets */ +#define VREG_TRANS 1 +#define VREG_STATE 2 +#define VREG_VOLTAGE 3 +/* TWL6030 Misc register offsets */ +#define VREG_BC_ALL 1 +#define VREG_BC_REF 2 +#define VREG_BC_PROC 3 +#define VREG_BC_CLK_RST 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 twlreg_is_enabled(struct regulator_dev *rdev) +{ + int state = twlreg_grp(rdev); + + if (state < 0) + return state; + + if (twl_class_is_4030()) + state &= P1_GRP_4030; + else + state &= P1_GRP_6030; + return state; +} + +static int twlreg_enable(struct regulator_dev *rdev) +{ + struct twlreg_info *info = rdev_get_drvdata(rdev); + int grp; + + grp = twlreg_read(info, TWL_MODULE_PM_RECEIVER, VREG_GRP); + if (grp < 0) + return grp; + + if (twl_class_is_4030()) + grp |= P1_GRP_4030; + else + grp |= P1_GRP_6030; + + return twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_GRP, grp); +} + +static int twlreg_disable(struct regulator_dev *rdev) +{ + struct twlreg_info *info = rdev_get_drvdata(rdev); + int grp; + + grp = twlreg_read(info, TWL_MODULE_PM_RECEIVER, VREG_GRP); + if (grp < 0) + return grp; + + if (twl_class_is_4030()) + grp &= ~P1_GRP_4030; + else + grp &= ~P1_GRP_6030; + + return twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_GRP, grp); +} + +static int twlreg_get_status(struct regulator_dev *rdev) +{ + int state = twlreg_grp(rdev); + + if (twl_class_is_6030()) + return 0; /* FIXME return for 6030 regulator */ + + 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 twlreg_set_mode(struct regulator_dev *rdev, unsigned mode) +{ + struct twlreg_info *info = rdev_get_drvdata(rdev); + unsigned message; + int status; + + if (twl_class_is_6030()) + return 0; /* FIXME return for 6030 regulator */ + + /* 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; + } + + /* Ensure the resource is associated with some group */ + status = twlreg_grp(rdev); + if (status < 0) + return status; + if (!(status & (P3_GRP_4030 | P2_GRP_4030 | P1_GRP_4030))) + return -EACCES; + + status = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, + message >> 8, 0x15 /* PB_WORD_MSB */ ); + if (status >= 0) + return status; + + return twl_i2c_write_u8(TWL_MODULE_PM_MASTER, + message, 0x16 /* PB_WORD_LSB */ ); +} + +/*----------------------------------------------------------------------*/ + +/* + * 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. + */ +#ifdef CONFIG_TWL4030_ALLOW_UNSUPPORTED +#define UNSUP_MASK 0x0000 +#else +#define UNSUP_MASK 0x8000 +#endif + +#define UNSUP(x) (UNSUP_MASK | (x)) +#define IS_UNSUP(x) (UNSUP_MASK & (x)) +#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 VAUX1_6030_VSEL_table[] = { + 1000, 1300, 1800, 2500, + 2800, 2900, 3000, 3000, +}; +static const u16 VAUX2_6030_VSEL_table[] = { + 1200, 1800, 2500, 2750, + 2800, 2800, 2800, 2800, +}; +static const u16 VAUX3_6030_VSEL_table[] = { + 1000, 1200, 1300, 1800, + 2500, 2800, 3000, 3000, +}; +static const u16 VMMC_VSEL_table[] = { + 1200, 1800, 2800, 2900, + 3000, 3000, 3000, 3000, +}; +static const u16 VPP_VSEL_table[] = { + 1800, 1900, 2000, 2100, + 2200, 2300, 2400, 2500, +}; +static const u16 VUSIM_VSEL_table[] = { + 1200, 1800, 2500, 2900, +}; + +static int twlldo_list_voltage(struct regulator_dev *rdev, unsigned index) +{ + struct twlreg_info *info = rdev_get_drvdata(rdev); + int mV = info->table[index]; + + return IS_UNSUP(mV) ? 0 : (LDO_MV(mV) * 1000); +} + +static int +twlldo_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV) +{ + struct twlreg_info *info = rdev_get_drvdata(rdev); + int vsel; + + for (vsel = 0; vsel < info->table_len; vsel++) { + int mV = info->table[vsel]; + int uV; + + if (IS_UNSUP(mV)) + continue; + uV = LDO_MV(mV) * 1000; + + /* REVISIT for VAUX2, first match may not be best/lowest */ + + /* use the first in-range value */ + if (min_uV <= uV && uV <= max_uV) + return twlreg_write(info, TWL_MODULE_PM_RECEIVER, + VREG_VOLTAGE, vsel); + } + + return -EDOM; +} + +static int twlldo_get_voltage(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 LDO_MV(info->table[vsel]) * 1000; +} + +static struct regulator_ops twlldo_ops = { + .list_voltage = twlldo_list_voltage, + + .set_voltage = twlldo_set_voltage, + .get_voltage = twlldo_get_voltage, + + .enable = twlreg_enable, + .disable = twlreg_disable, + .is_enabled = twlreg_is_enabled, + + .set_mode = twlreg_set_mode, + + .get_status = twlreg_get_status, +}; + +/*----------------------------------------------------------------------*/ + +/* + * Fixed voltage LDOs don't have a VSEL field to update. + */ +static int twlfixed_list_voltage(struct regulator_dev *rdev, unsigned index) +{ + struct twlreg_info *info = rdev_get_drvdata(rdev); + + return info->min_mV * 1000; +} + +static int twlfixed_get_voltage(struct regulator_dev *rdev) +{ + struct twlreg_info *info = rdev_get_drvdata(rdev); + + return info->min_mV * 1000; +} + +static struct regulator_ops twlfixed_ops = { + .list_voltage = twlfixed_list_voltage, + + .get_voltage = twlfixed_get_voltage, + + .enable = twlreg_enable, + .disable = twlreg_disable, + .is_enabled = twlreg_is_enabled, + + .set_mode = twlreg_set_mode, + + .get_status = twlreg_get_status, +}; + +/*----------------------------------------------------------------------*/ + +#define TWL4030_ADJUSTABLE_LDO(label, offset, num) \ + TWL_ADJUSTABLE_LDO(label, offset, num, TWL4030) +#define TWL4030_FIXED_LDO(label, offset, mVolts, num) \ + TWL_FIXED_LDO(label, offset, mVolts, num, TWL4030) +#define TWL6030_ADJUSTABLE_LDO(label, offset, num) \ + TWL_ADJUSTABLE_LDO(label, offset, num, TWL6030) +#define TWL6030_FIXED_LDO(label, offset, mVolts, num) \ + TWL_FIXED_LDO(label, offset, mVolts, num, TWL6030) + +#define TWL_ADJUSTABLE_LDO(label, offset, num, family) { \ + .base = offset, \ + .id = num, \ + .table_len = ARRAY_SIZE(label##_VSEL_table), \ + .table = label##_VSEL_table, \ + .desc = { \ + .name = #label, \ + .id = family##_REG_##label, \ + .n_voltages = ARRAY_SIZE(label##_VSEL_table), \ + .ops = &twlldo_ops, \ + .type = REGULATOR_VOLTAGE, \ + .owner = THIS_MODULE, \ + }, \ + } + +#define TWL_FIXED_LDO(label, offset, mVolts, num, family) { \ + .base = offset, \ + .id = num, \ + .min_mV = mVolts, \ + .desc = { \ + .name = #label, \ + .id = family##_REG_##label, \ + .n_voltages = 1, \ + .ops = &twlfixed_ops, \ + .type = REGULATOR_VOLTAGE, \ + .owner = THIS_MODULE, \ + }, \ + } + +/* + * We list regulators here if systems need some level of + * software control over them after boot. + */ +static struct twlreg_info twl_regs[] = { + TWL4030_ADJUSTABLE_LDO(VAUX1, 0x17, 1), + TWL4030_ADJUSTABLE_LDO(VAUX2_4030, 0x1b, 2), + TWL4030_ADJUSTABLE_LDO(VAUX2, 0x1b, 2), + TWL4030_ADJUSTABLE_LDO(VAUX3, 0x1f, 3), + TWL4030_ADJUSTABLE_LDO(VAUX4, 0x23, 4), + TWL4030_ADJUSTABLE_LDO(VMMC1, 0x27, 5), + TWL4030_ADJUSTABLE_LDO(VMMC2, 0x2b, 6), + /* + TWL4030_ADJUSTABLE_LDO(VPLL1, 0x2f, 7), + */ + TWL4030_ADJUSTABLE_LDO(VPLL2, 0x33, 8), + TWL4030_ADJUSTABLE_LDO(VSIM, 0x37, 9), + TWL4030_ADJUSTABLE_LDO(VDAC, 0x3b, 10), + /* + TWL4030_ADJUSTABLE_LDO(VINTANA1, 0x3f, 11), + TWL4030_ADJUSTABLE_LDO(VINTANA2, 0x43, 12), + TWL4030_ADJUSTABLE_LDO(VINTDIG, 0x47, 13), + TWL4030_SMPS(VIO, 0x4b, 14), + TWL4030_SMPS(VDD1, 0x55, 15), + TWL4030_SMPS(VDD2, 0x63, 16), + */ + TWL4030_FIXED_LDO(VUSB1V5, 0x71, 1500, 17), + TWL4030_FIXED_LDO(VUSB1V8, 0x74, 1800, 18), + TWL4030_FIXED_LDO(VUSB3V1, 0x77, 3100, 19), + /* VUSBCP is managed *only* by the USB subchip */ + + /* 6030 REG with base as PMC Slave Misc : 0x0030 */ + TWL6030_ADJUSTABLE_LDO(VAUX1_6030, 0x54, 1), + TWL6030_ADJUSTABLE_LDO(VAUX2_6030, 0x58, 2), + TWL6030_ADJUSTABLE_LDO(VAUX3_6030, 0x5c, 3), + TWL6030_ADJUSTABLE_LDO(VMMC, 0x68, 4), + TWL6030_ADJUSTABLE_LDO(VPP, 0x6c, 5), + TWL6030_ADJUSTABLE_LDO(VUSIM, 0x74, 7), + TWL6030_FIXED_LDO(VANA, 0x50, 2100, 15), + TWL6030_FIXED_LDO(VCXIO, 0x60, 1800, 16), + TWL6030_FIXED_LDO(VDAC, 0x64, 1800, 17), + TWL6030_FIXED_LDO(VUSB, 0x70, 3300, 18) +}; + +static int twlreg_probe(struct platform_device *pdev) +{ + int i; + struct twlreg_info *info; + struct regulator_init_data *initdata; + struct regulation_constraints *c; + struct regulator_dev *rdev; + + for (i = 0, info = NULL; i < ARRAY_SIZE(twl_regs); i++) { + if (twl_regs[i].desc.id != pdev->id) + continue; + info = twl_regs + i; + break; + } + if (!info) + return -ENODEV; + + initdata = pdev->dev.platform_data; + if (!initdata) + return -EINVAL; + + /* 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; + + rdev = regulator_register(&info->desc, &pdev->dev, initdata, info); + 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); + + /* 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; +} + +static int __devexit twlreg_remove(struct platform_device *pdev) +{ + regulator_unregister(platform_get_drvdata(pdev)); + return 0; +} + +MODULE_ALIAS("platform:twl_reg"); + +static struct platform_driver twlreg_driver = { + .probe = twlreg_probe, + .remove = __devexit_p(twlreg_remove), + /* NOTE: short name, to work around driver model truncation of + * "twl_regulator.12" (and friends) to "twl_regulator.1". + */ + .driver.name = "twl_reg", + .driver.owner = THIS_MODULE, +}; + +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("TWL regulator driver"); +MODULE_LICENSE("GPL"); |