diff options
Diffstat (limited to 'drivers/regulator/ab8500.c')
| -rw-r--r-- | drivers/regulator/ab8500.c | 427 |
1 files changed, 427 insertions, 0 deletions
diff --git a/drivers/regulator/ab8500.c b/drivers/regulator/ab8500.c new file mode 100644 index 000000000000..dc3f1a491675 --- /dev/null +++ b/drivers/regulator/ab8500.c @@ -0,0 +1,427 @@ +/* + * Copyright (C) ST-Ericsson SA 2010 + * + * License Terms: GNU General Public License v2 + * + * Author: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson + * + * AB8500 peripheral regulators + * + * AB8500 supports the following regulators, + * LDOs - VAUDIO, VANAMIC2/2, VDIGMIC, VINTCORE12, VTVOUT, + * VAUX1/2/3, VANA + * + * for DB8500 cut 1.0 and previous versions of the silicon, all accesses + * to registers are through the DB8500 SPI. In cut 1.1 onwards, these + * accesses are through the DB8500 PRCMU I2C + * + */ +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/err.h> +#include <linux/platform_device.h> +#include <linux/mfd/ab8500.h> +#include <linux/regulator/driver.h> +#include <linux/regulator/machine.h> +#include <linux/regulator/ab8500.h> + +/** + * struct ab8500_regulator_info - ab8500 regulator information + * @desc: regulator description + * @ab8500: ab8500 parent + * @regulator_dev: regulator device + * @max_uV: maximum voltage (for variable voltage supplies) + * @min_uV: minimum voltage (for variable voltage supplies) + * @fixed_uV: typical voltage (for fixed voltage supplies) + * @update_reg: register to control on/off + * @mask: mask to enable/disable regulator + * @enable: bits to enable the regulator in normal(high power) mode + * @voltage_reg: register to control regulator voltage + * @voltage_mask: mask to control regulator voltage + * @supported_voltages: supported voltage table + * @voltages_len: number of supported voltages for the regulator + */ +struct ab8500_regulator_info { + struct device *dev; + struct regulator_desc desc; + struct ab8500 *ab8500; + struct regulator_dev *regulator; + int max_uV; + int min_uV; + int fixed_uV; + int update_reg; + int mask; + int enable; + int voltage_reg; + int voltage_mask; + int const *supported_voltages; + int voltages_len; +}; + +/* voltage tables for the vauxn/vintcore supplies */ +static const int ldo_vauxn_voltages[] = { + 1100000, + 1200000, + 1300000, + 1400000, + 1500000, + 1800000, + 1850000, + 1900000, + 2500000, + 2650000, + 2700000, + 2750000, + 2800000, + 2900000, + 3000000, + 3300000, +}; + +static const int ldo_vintcore_voltages[] = { + 1200000, + 1225000, + 1250000, + 1275000, + 1300000, + 1325000, + 1350000, +}; + +static int ab8500_regulator_enable(struct regulator_dev *rdev) +{ + int regulator_id, ret; + struct ab8500_regulator_info *info = rdev_get_drvdata(rdev); + + regulator_id = rdev_get_id(rdev); + if (regulator_id >= AB8500_NUM_REGULATORS) + return -EINVAL; + + ret = ab8500_set_bits(info->ab8500, info->update_reg, + info->mask, info->enable); + if (ret < 0) + dev_err(rdev_get_dev(rdev), + "couldn't set enable bits for regulator\n"); + return ret; +} + +static int ab8500_regulator_disable(struct regulator_dev *rdev) +{ + int regulator_id, ret; + struct ab8500_regulator_info *info = rdev_get_drvdata(rdev); + + regulator_id = rdev_get_id(rdev); + if (regulator_id >= AB8500_NUM_REGULATORS) + return -EINVAL; + + ret = ab8500_set_bits(info->ab8500, info->update_reg, + info->mask, 0x0); + if (ret < 0) + dev_err(rdev_get_dev(rdev), + "couldn't set disable bits for regulator\n"); + return ret; +} + +static int ab8500_regulator_is_enabled(struct regulator_dev *rdev) +{ + int regulator_id, ret; + struct ab8500_regulator_info *info = rdev_get_drvdata(rdev); + + regulator_id = rdev_get_id(rdev); + if (regulator_id >= AB8500_NUM_REGULATORS) + return -EINVAL; + + ret = ab8500_read(info->ab8500, info->update_reg); + if (ret < 0) { + dev_err(rdev_get_dev(rdev), + "couldn't read 0x%x register\n", info->update_reg); + return ret; + } + + if (ret & info->mask) + return true; + else + return false; +} + +static int ab8500_list_voltage(struct regulator_dev *rdev, unsigned selector) +{ + int regulator_id; + struct ab8500_regulator_info *info = rdev_get_drvdata(rdev); + + regulator_id = rdev_get_id(rdev); + if (regulator_id >= AB8500_NUM_REGULATORS) + return -EINVAL; + + /* return the uV for the fixed regulators */ + if (info->fixed_uV) + return info->fixed_uV; + + if (selector > info->voltages_len) + return -EINVAL; + + return info->supported_voltages[selector]; +} + +static int ab8500_regulator_get_voltage(struct regulator_dev *rdev) +{ + int regulator_id, ret, val; + struct ab8500_regulator_info *info = rdev_get_drvdata(rdev); + + regulator_id = rdev_get_id(rdev); + if (regulator_id >= AB8500_NUM_REGULATORS) + return -EINVAL; + + ret = ab8500_read(info->ab8500, info->voltage_reg); + if (ret < 0) { + dev_err(rdev_get_dev(rdev), + "couldn't read voltage reg for regulator\n"); + return ret; + } + + /* vintcore has a different layout */ + val = ret & info->voltage_mask; + if (regulator_id == AB8500_LDO_INTCORE) + ret = info->supported_voltages[val >> 0x3]; + else + ret = info->supported_voltages[val]; + + return ret; +} + +static int ab8500_get_best_voltage_index(struct regulator_dev *rdev, + int min_uV, int max_uV) +{ + struct ab8500_regulator_info *info = rdev_get_drvdata(rdev); + int i; + + /* check the supported voltage */ + for (i = 0; i < info->voltages_len; i++) { + if ((info->supported_voltages[i] >= min_uV) && + (info->supported_voltages[i] <= max_uV)) + return i; + } + + return -EINVAL; +} + +static int ab8500_regulator_set_voltage(struct regulator_dev *rdev, + int min_uV, int max_uV) +{ + int regulator_id, ret; + struct ab8500_regulator_info *info = rdev_get_drvdata(rdev); + + regulator_id = rdev_get_id(rdev); + if (regulator_id >= AB8500_NUM_REGULATORS) + return -EINVAL; + + /* get the appropriate voltages within the range */ + ret = ab8500_get_best_voltage_index(rdev, min_uV, max_uV); + if (ret < 0) { + dev_err(rdev_get_dev(rdev), + "couldn't get best voltage for regulator\n"); + return ret; + } + + /* set the registers for the request */ + ret = ab8500_set_bits(info->ab8500, info->voltage_reg, + info->voltage_mask, ret); + if (ret < 0) + dev_err(rdev_get_dev(rdev), + "couldn't set voltage reg for regulator\n"); + + return ret; +} + +static struct regulator_ops ab8500_regulator_ops = { + .enable = ab8500_regulator_enable, + .disable = ab8500_regulator_disable, + .is_enabled = ab8500_regulator_is_enabled, + .get_voltage = ab8500_regulator_get_voltage, + .set_voltage = ab8500_regulator_set_voltage, + .list_voltage = ab8500_list_voltage, +}; + +static int ab8500_fixed_get_voltage(struct regulator_dev *rdev) +{ + int regulator_id; + struct ab8500_regulator_info *info = rdev_get_drvdata(rdev); + + regulator_id = rdev_get_id(rdev); + if (regulator_id >= AB8500_NUM_REGULATORS) + return -EINVAL; + + return info->fixed_uV; +} + +static struct regulator_ops ab8500_ldo_fixed_ops = { + .enable = ab8500_regulator_enable, + .disable = ab8500_regulator_disable, + .is_enabled = ab8500_regulator_is_enabled, + .get_voltage = ab8500_fixed_get_voltage, + .list_voltage = ab8500_list_voltage, +}; + +#define AB8500_LDO(_id, min, max, reg, reg_mask, reg_enable, \ + volt_reg, volt_mask, voltages, \ + len_volts) \ +{ \ + .desc = { \ + .name = "LDO-" #_id, \ + .ops = &ab8500_regulator_ops, \ + .type = REGULATOR_VOLTAGE, \ + .id = AB8500_LDO_##_id, \ + .owner = THIS_MODULE, \ + }, \ + .min_uV = (min) * 1000, \ + .max_uV = (max) * 1000, \ + .update_reg = reg, \ + .mask = reg_mask, \ + .enable = reg_enable, \ + .voltage_reg = volt_reg, \ + .voltage_mask = volt_mask, \ + .supported_voltages = voltages, \ + .voltages_len = len_volts, \ + .fixed_uV = 0, \ +} + +#define AB8500_FIXED_LDO(_id, fixed, reg, reg_mask, \ + reg_enable) \ +{ \ + .desc = { \ + .name = "LDO-" #_id, \ + .ops = &ab8500_ldo_fixed_ops, \ + .type = REGULATOR_VOLTAGE, \ + .id = AB8500_LDO_##_id, \ + .owner = THIS_MODULE, \ + }, \ + .fixed_uV = fixed * 1000, \ + .update_reg = reg, \ + .mask = reg_mask, \ + .enable = reg_enable, \ +} + +static struct ab8500_regulator_info ab8500_regulator_info[] = { + /* + * Variable Voltage LDOs + * name, min uV, max uV, ctrl reg, reg mask, enable mask, + * volt ctrl reg, volt ctrl mask, volt table, num supported volts + */ + AB8500_LDO(AUX1, 1100, 3300, 0x0409, 0x3, 0x1, 0x041f, 0xf, + ldo_vauxn_voltages, ARRAY_SIZE(ldo_vauxn_voltages)), + AB8500_LDO(AUX2, 1100, 3300, 0x0409, 0xc, 0x4, 0x0420, 0xf, + ldo_vauxn_voltages, ARRAY_SIZE(ldo_vauxn_voltages)), + AB8500_LDO(AUX3, 1100, 3300, 0x040a, 0x3, 0x1, 0x0421, 0xf, + ldo_vauxn_voltages, ARRAY_SIZE(ldo_vauxn_voltages)), + AB8500_LDO(INTCORE, 1100, 3300, 0x0380, 0x4, 0x4, 0x0380, 0x38, + ldo_vintcore_voltages, ARRAY_SIZE(ldo_vintcore_voltages)), + + /* + * Fixed Voltage LDOs + * name, o/p uV, ctrl reg, enable, disable + */ + AB8500_FIXED_LDO(TVOUT, 2000, 0x0380, 0x2, 0x2), + AB8500_FIXED_LDO(AUDIO, 2000, 0x0383, 0x2, 0x2), + AB8500_FIXED_LDO(ANAMIC1, 2050, 0x0383, 0x4, 0x4), + AB8500_FIXED_LDO(ANAMIC2, 2050, 0x0383, 0x8, 0x8), + AB8500_FIXED_LDO(DMIC, 1800, 0x0383, 0x10, 0x10), + AB8500_FIXED_LDO(ANA, 1200, 0x0383, 0xc, 0x4), +}; + +static inline struct ab8500_regulator_info *find_regulator_info(int id) +{ + struct ab8500_regulator_info *info; + int i; + + for (i = 0; i < ARRAY_SIZE(ab8500_regulator_info); i++) { + info = &ab8500_regulator_info[i]; + if (info->desc.id == id) + return info; + } + return NULL; +} + +static __devinit int ab8500_regulator_probe(struct platform_device *pdev) +{ + struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent); + struct ab8500_platform_data *pdata = dev_get_platdata(ab8500->dev); + int i, err; + + if (!ab8500) { + dev_err(&pdev->dev, "null mfd parent\n"); + return -EINVAL; + } + + /* register all regulators */ + for (i = 0; i < ARRAY_SIZE(ab8500_regulator_info); i++) { + struct ab8500_regulator_info *info = NULL; + + /* assign per-regulator data */ + info = &ab8500_regulator_info[i]; + info->dev = &pdev->dev; + info->ab8500 = ab8500; + + info->regulator = regulator_register(&info->desc, &pdev->dev, + pdata->regulator[i], info); + if (IS_ERR(info->regulator)) { + err = PTR_ERR(info->regulator); + dev_err(&pdev->dev, "failed to register regulator %s\n", + info->desc.name); + /* when we fail, un-register all earlier regulators */ + i--; + while (i > 0) { + info = &ab8500_regulator_info[i]; + regulator_unregister(info->regulator); + i--; + } + return err; + } + } + + return 0; +} + +static __devexit int ab8500_regulator_remove(struct platform_device *pdev) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(ab8500_regulator_info); i++) { + struct ab8500_regulator_info *info = NULL; + info = &ab8500_regulator_info[i]; + regulator_unregister(info->regulator); + } + + return 0; +} + +static struct platform_driver ab8500_regulator_driver = { + .probe = ab8500_regulator_probe, + .remove = __devexit_p(ab8500_regulator_remove), + .driver = { + .name = "ab8500-regulator", + .owner = THIS_MODULE, + }, +}; + +static int __init ab8500_regulator_init(void) +{ + int ret; + + ret = platform_driver_register(&ab8500_regulator_driver); + if (ret != 0) + pr_err("Failed to register ab8500 regulator: %d\n", ret); + + return ret; +} +subsys_initcall(ab8500_regulator_init); + +static void __exit ab8500_regulator_exit(void) +{ + platform_driver_unregister(&ab8500_regulator_driver); +} +module_exit(ab8500_regulator_exit); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Sundar Iyer <sundar.iyer@stericsson.com>"); +MODULE_DESCRIPTION("Regulator Driver for ST-Ericsson AB8500 Mixed-Sig PMIC"); +MODULE_ALIAS("platform:ab8500-regulator"); |