diff options
Diffstat (limited to 'drivers/regulator/rtq2208-regulator.c')
| -rw-r--r-- | drivers/regulator/rtq2208-regulator.c | 583 |
1 files changed, 583 insertions, 0 deletions
diff --git a/drivers/regulator/rtq2208-regulator.c b/drivers/regulator/rtq2208-regulator.c new file mode 100644 index 0000000000..2d54844c42 --- /dev/null +++ b/drivers/regulator/rtq2208-regulator.c @@ -0,0 +1,583 @@ +// SPDX-License-Identifier: GPL-2.0+ + +#include <linux/bitops.h> +#include <linux/bitfield.h> +#include <linux/util_macros.h> +#include <linux/module.h> +#include <linux/i2c.h> +#include <linux/regmap.h> +#include <linux/regulator/driver.h> +#include <linux/regulator/machine.h> +#include <linux/regulator/of_regulator.h> +#include <linux/mod_devicetable.h> + +/* Register */ +#define RTQ2208_REG_GLOBAL_INT1 0x12 +#define RTQ2208_REG_FLT_RECORDBUCK_CB 0x18 +#define RTQ2208_REG_GLOBAL_INT1_MASK 0x1D +#define RTQ2208_REG_FLT_MASKBUCK_CB 0x1F +#define RTQ2208_REG_BUCK_C_CFG0 0x32 +#define RTQ2208_REG_BUCK_B_CFG0 0x42 +#define RTQ2208_REG_BUCK_A_CFG0 0x52 +#define RTQ2208_REG_BUCK_D_CFG0 0x62 +#define RTQ2208_REG_BUCK_G_CFG0 0x72 +#define RTQ2208_REG_BUCK_F_CFG0 0x82 +#define RTQ2208_REG_BUCK_E_CFG0 0x92 +#define RTQ2208_REG_BUCK_H_CFG0 0xA2 +#define RTQ2208_REG_LDO1_CFG 0xB1 +#define RTQ2208_REG_LDO2_CFG 0xC1 + +/* Mask */ +#define RTQ2208_BUCK_NR_MTP_SEL_MASK GENMASK(7, 0) +#define RTQ2208_BUCK_EN_NR_MTP_SEL0_MASK BIT(0) +#define RTQ2208_BUCK_EN_NR_MTP_SEL1_MASK BIT(1) +#define RTQ2208_BUCK_RSPUP_MASK GENMASK(6, 4) +#define RTQ2208_BUCK_RSPDN_MASK GENMASK(2, 0) +#define RTQ2208_BUCK_NRMODE_MASK BIT(5) +#define RTQ2208_BUCK_STRMODE_MASK BIT(5) +#define RTQ2208_BUCK_EN_STR_MASK BIT(0) +#define RTQ2208_LDO_EN_STR_MASK BIT(7) +#define RTQ2208_EN_DIS_MASK BIT(0) +#define RTQ2208_BUCK_RAMP_SEL_MASK GENMASK(2, 0) +#define RTQ2208_HD_INT_MASK BIT(0) + +/* Size */ +#define RTQ2208_VOUT_MAXNUM 256 +#define RTQ2208_BUCK_NUM_IRQ_REGS 5 +#define RTQ2208_STS_NUM_IRQ_REGS 2 + +/* Value */ +#define RTQ2208_RAMP_VALUE_MIN_uV 500 +#define RTQ2208_RAMP_VALUE_MAX_uV 64000 + +#define RTQ2208_BUCK_MASK(uv_irq, ov_irq) (1 << ((uv_irq) % 8) | 1 << ((ov_irq) % 8)) + +enum { + RTQ2208_BUCK_B = 0, + RTQ2208_BUCK_C, + RTQ2208_BUCK_D, + RTQ2208_BUCK_A, + RTQ2208_BUCK_F, + RTQ2208_BUCK_G, + RTQ2208_BUCK_H, + RTQ2208_BUCK_E, + RTQ2208_LDO2, + RTQ2208_LDO1, + RTQ2208_LDO_MAX, +}; + +enum { + RTQ2208_AUTO_MODE = 0, + RTQ2208_FCCM, +}; + +struct rtq2208_regulator_desc { + struct regulator_desc desc; + unsigned int mtp_sel_reg; + unsigned int mtp_sel_mask; + unsigned int mode_reg; + unsigned int mode_mask; + unsigned int suspend_config_reg; + unsigned int suspend_enable_mask; + unsigned int suspend_mode_mask; +}; + +struct rtq2208_rdev_map { + struct regulator_dev *rdev[RTQ2208_LDO_MAX]; + struct regmap *regmap; + struct device *dev; +}; + +/* set Normal Auto/FCCM mode */ +static int rtq2208_set_mode(struct regulator_dev *rdev, unsigned int mode) +{ + const struct rtq2208_regulator_desc *rdesc = + (const struct rtq2208_regulator_desc *)rdev->desc; + unsigned int val, shift; + + switch (mode) { + case REGULATOR_MODE_NORMAL: + val = RTQ2208_AUTO_MODE; + break; + case REGULATOR_MODE_FAST: + val = RTQ2208_FCCM; + break; + default: + return -EINVAL; + } + + shift = ffs(rdesc->mode_mask) - 1; + return regmap_update_bits(rdev->regmap, rdesc->mode_reg, + rdesc->mode_mask, val << shift); +} + +static unsigned int rtq2208_get_mode(struct regulator_dev *rdev) +{ + const struct rtq2208_regulator_desc *rdesc = + (const struct rtq2208_regulator_desc *)rdev->desc; + unsigned int mode_val; + int ret; + + ret = regmap_read(rdev->regmap, rdesc->mode_reg, &mode_val); + if (ret) + return REGULATOR_MODE_INVALID; + + return (mode_val & rdesc->mode_mask) ? REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL; +} + +static int rtq2208_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay) +{ + const struct regulator_desc *desc = rdev->desc; + unsigned int sel = 0, val; + + ramp_delay = max(ramp_delay, RTQ2208_RAMP_VALUE_MIN_uV); + ramp_delay = min(ramp_delay, RTQ2208_RAMP_VALUE_MAX_uV); + + ramp_delay /= RTQ2208_RAMP_VALUE_MIN_uV; + + /* + * fls(ramp_delay) - 1: doing LSB shift, let it starts from 0 + * + * RTQ2208_BUCK_RAMP_SEL_MASK - sel: doing descending order shifting. + * Because the relation of seleltion and value is like that + * + * seletion: value + * 000: 64mv + * 001: 32mv + * ... + * 111: 0.5mv + * + * For example, if I would like to select 64mv, the fls(ramp_delay) - 1 will be 0b111, + * and I need to use 0b111 - sel to do the shifting + */ + + sel = fls(ramp_delay) - 1; + sel = RTQ2208_BUCK_RAMP_SEL_MASK - sel; + + val = FIELD_PREP(RTQ2208_BUCK_RSPUP_MASK, sel) | FIELD_PREP(RTQ2208_BUCK_RSPDN_MASK, sel); + + return regmap_update_bits(rdev->regmap, desc->ramp_reg, + RTQ2208_BUCK_RSPUP_MASK | RTQ2208_BUCK_RSPDN_MASK, val); +} + +static int rtq2208_set_suspend_enable(struct regulator_dev *rdev) +{ + const struct rtq2208_regulator_desc *rdesc = + (const struct rtq2208_regulator_desc *)rdev->desc; + + return regmap_set_bits(rdev->regmap, rdesc->suspend_config_reg, rdesc->suspend_enable_mask); +} + +static int rtq2208_set_suspend_disable(struct regulator_dev *rdev) +{ + const struct rtq2208_regulator_desc *rdesc = + (const struct rtq2208_regulator_desc *)rdev->desc; + + return regmap_update_bits(rdev->regmap, rdesc->suspend_config_reg, rdesc->suspend_enable_mask, 0); +} + +static int rtq2208_set_suspend_mode(struct regulator_dev *rdev, unsigned int mode) +{ + const struct rtq2208_regulator_desc *rdesc = + (const struct rtq2208_regulator_desc *)rdev->desc; + unsigned int val, shift; + + switch (mode) { + case REGULATOR_MODE_NORMAL: + val = RTQ2208_AUTO_MODE; + break; + case REGULATOR_MODE_FAST: + val = RTQ2208_FCCM; + break; + default: + return -EINVAL; + } + + shift = ffs(rdesc->suspend_mode_mask) - 1; + + return regmap_update_bits(rdev->regmap, rdesc->suspend_config_reg, + rdesc->suspend_mode_mask, val << shift); +} + +static const struct regulator_ops rtq2208_regulator_buck_ops = { + .enable = regulator_enable_regmap, + .disable = regulator_disable_regmap, + .is_enabled = regulator_is_enabled_regmap, + .list_voltage = regulator_list_voltage_linear_range, + .set_voltage_sel = regulator_set_voltage_sel_regmap, + .get_voltage_sel = regulator_get_voltage_sel_regmap, + .set_mode = rtq2208_set_mode, + .get_mode = rtq2208_get_mode, + .set_ramp_delay = rtq2208_set_ramp_delay, + .set_active_discharge = regulator_set_active_discharge_regmap, + .set_suspend_enable = rtq2208_set_suspend_enable, + .set_suspend_disable = rtq2208_set_suspend_disable, + .set_suspend_mode = rtq2208_set_suspend_mode, +}; + +static const struct regulator_ops rtq2208_regulator_ldo_ops = { + .enable = regulator_enable_regmap, + .disable = regulator_disable_regmap, + .is_enabled = regulator_is_enabled_regmap, + .set_active_discharge = regulator_set_active_discharge_regmap, + .set_suspend_enable = rtq2208_set_suspend_enable, + .set_suspend_disable = rtq2208_set_suspend_disable, +}; + +static unsigned int rtq2208_of_map_mode(unsigned int mode) +{ + switch (mode) { + case RTQ2208_AUTO_MODE: + return REGULATOR_MODE_NORMAL; + case RTQ2208_FCCM: + return REGULATOR_MODE_FAST; + default: + return REGULATOR_MODE_INVALID; + } +} + +static int rtq2208_init_irq_mask(struct rtq2208_rdev_map *rdev_map, unsigned int *buck_masks) +{ + unsigned char buck_clr_masks[5] = {0x33, 0x33, 0x33, 0x33, 0x33}, + sts_clr_masks[2] = {0xE7, 0xF7}, sts_masks[2] = {0xE6, 0xF6}; + int ret; + + /* write clear all buck irq once */ + ret = regmap_bulk_write(rdev_map->regmap, RTQ2208_REG_FLT_RECORDBUCK_CB, buck_clr_masks, 5); + if (ret) + return dev_err_probe(rdev_map->dev, ret, "Failed to clr buck irqs\n"); + + /* write clear general irq once */ + ret = regmap_bulk_write(rdev_map->regmap, RTQ2208_REG_GLOBAL_INT1, sts_clr_masks, 2); + if (ret) + return dev_err_probe(rdev_map->dev, ret, "Failed to clr general irqs\n"); + + /* unmask buck ov/uv irq */ + ret = regmap_bulk_write(rdev_map->regmap, RTQ2208_REG_FLT_MASKBUCK_CB, buck_masks, 5); + if (ret) + return dev_err_probe(rdev_map->dev, ret, "Failed to unmask buck irqs\n"); + + /* unmask needed general irq */ + return regmap_bulk_write(rdev_map->regmap, RTQ2208_REG_GLOBAL_INT1_MASK, sts_masks, 2); +} + +static irqreturn_t rtq2208_irq_handler(int irqno, void *devid) +{ + unsigned char buck_flags[RTQ2208_BUCK_NUM_IRQ_REGS], sts_flags[RTQ2208_STS_NUM_IRQ_REGS]; + int ret = 0, i, uv_bit, ov_bit; + struct rtq2208_rdev_map *rdev_map = devid; + struct regulator_dev *rdev; + + if (!rdev_map) + return IRQ_NONE; + + /* read irq event */ + ret = regmap_bulk_read(rdev_map->regmap, RTQ2208_REG_FLT_RECORDBUCK_CB, + buck_flags, ARRAY_SIZE(buck_flags)); + if (ret) + return IRQ_NONE; + + ret = regmap_bulk_read(rdev_map->regmap, RTQ2208_REG_GLOBAL_INT1, + sts_flags, ARRAY_SIZE(sts_flags)); + if (ret) + return IRQ_NONE; + + /* clear irq event */ + ret = regmap_bulk_write(rdev_map->regmap, RTQ2208_REG_FLT_RECORDBUCK_CB, + buck_flags, ARRAY_SIZE(buck_flags)); + if (ret) + return IRQ_NONE; + + ret = regmap_bulk_write(rdev_map->regmap, RTQ2208_REG_GLOBAL_INT1, + sts_flags, ARRAY_SIZE(sts_flags)); + if (ret) + return IRQ_NONE; + + for (i = 0; i < RTQ2208_LDO_MAX; i++) { + if (!rdev_map->rdev[i]) + continue; + + rdev = rdev_map->rdev[i]; + /* uv irq */ + uv_bit = (i & 1) ? 4 : 0; + if (buck_flags[i >> 1] & (1 << uv_bit)) + regulator_notifier_call_chain(rdev, + REGULATOR_EVENT_UNDER_VOLTAGE, NULL); + /* ov irq */ + ov_bit = uv_bit + 1; + if (buck_flags[i >> 1] & (1 << ov_bit)) + regulator_notifier_call_chain(rdev, + REGULATOR_EVENT_REGULATION_OUT, NULL); + + /* hd irq */ + if (sts_flags[1] & RTQ2208_HD_INT_MASK) + regulator_notifier_call_chain(rdev, + REGULATOR_EVENT_OVER_TEMP, NULL); + } + + return IRQ_HANDLED; +} + +#define RTQ2208_REGULATOR_INFO(_name, _base) \ +{ \ + .name = #_name, \ + .base = _base, \ +} +#define BUCK_RG_BASE(_id) RTQ2208_REG_BUCK_##_id##_CFG0 +#define BUCK_RG_SHIFT(_base, _shift) (_base + _shift) +#define LDO_RG_BASE(_id) RTQ2208_REG_LDO##_id##_CFG +#define LDO_RG_SHIFT(_base, _shift) (_base + _shift) +#define VSEL_SHIFT(_sel) (_sel ? 3 : 1) +#define MTP_SEL_MASK(_sel) RTQ2208_BUCK_EN_NR_MTP_SEL##_sel##_MASK + +static const struct linear_range rtq2208_vout_range[] = { + REGULATOR_LINEAR_RANGE(400000, 0, 180, 5000), + REGULATOR_LINEAR_RANGE(1310000, 181, 255, 10000), +}; + +static int rtq2208_of_get_fixed_voltage(struct device *dev, + struct of_regulator_match *rtq2208_ldo_match, int n_fixed) +{ + struct device_node *np; + struct of_regulator_match *match; + struct rtq2208_regulator_desc *rdesc; + struct regulator_init_data *init_data; + int ret, i; + + if (!dev->of_node) + return -ENODEV; + + np = of_get_child_by_name(dev->of_node, "regulators"); + if (!np) + np = dev->of_node; + + ret = of_regulator_match(dev, np, rtq2208_ldo_match, n_fixed); + + of_node_put(np); + + if (ret < 0) + return ret; + + for (i = 0; i < n_fixed; i++) { + match = rtq2208_ldo_match + i; + init_data = match->init_data; + rdesc = (struct rtq2208_regulator_desc *)match->driver_data; + + if (!init_data || !rdesc) + continue; + + if (init_data->constraints.min_uV == init_data->constraints.max_uV) + rdesc->desc.fixed_uV = init_data->constraints.min_uV; + } + + return 0; +} + +static void rtq2208_init_regulator_desc(struct rtq2208_regulator_desc *rdesc, int mtp_sel, + int idx, struct of_regulator_match *rtq2208_ldo_match, int *ldo_idx) +{ + struct regulator_desc *desc; + static const struct { + char *name; + int base; + } regulator_info[] = { + RTQ2208_REGULATOR_INFO(buck-b, BUCK_RG_BASE(B)), + RTQ2208_REGULATOR_INFO(buck-c, BUCK_RG_BASE(C)), + RTQ2208_REGULATOR_INFO(buck-d, BUCK_RG_BASE(D)), + RTQ2208_REGULATOR_INFO(buck-a, BUCK_RG_BASE(A)), + RTQ2208_REGULATOR_INFO(buck-f, BUCK_RG_BASE(F)), + RTQ2208_REGULATOR_INFO(buck-g, BUCK_RG_BASE(G)), + RTQ2208_REGULATOR_INFO(buck-h, BUCK_RG_BASE(H)), + RTQ2208_REGULATOR_INFO(buck-e, BUCK_RG_BASE(E)), + RTQ2208_REGULATOR_INFO(ldo2, LDO_RG_BASE(2)), + RTQ2208_REGULATOR_INFO(ldo1, LDO_RG_BASE(1)), + }, *curr_info; + + curr_info = regulator_info + idx; + desc = &rdesc->desc; + desc->name = curr_info->name; + desc->of_match = of_match_ptr(curr_info->name); + desc->regulators_node = of_match_ptr("regulators"); + desc->id = idx; + desc->owner = THIS_MODULE; + desc->type = REGULATOR_VOLTAGE; + desc->enable_mask = mtp_sel ? MTP_SEL_MASK(1) : MTP_SEL_MASK(0); + desc->active_discharge_on = RTQ2208_EN_DIS_MASK; + desc->active_discharge_off = 0; + desc->active_discharge_mask = RTQ2208_EN_DIS_MASK; + + rdesc->mode_mask = RTQ2208_BUCK_NRMODE_MASK; + + if (idx >= RTQ2208_BUCK_B && idx <= RTQ2208_BUCK_E) { + /* init buck desc */ + desc->enable_reg = BUCK_RG_SHIFT(curr_info->base, 2); + desc->ops = &rtq2208_regulator_buck_ops; + desc->vsel_reg = curr_info->base + VSEL_SHIFT(mtp_sel); + desc->vsel_mask = RTQ2208_BUCK_NR_MTP_SEL_MASK; + desc->n_voltages = RTQ2208_VOUT_MAXNUM; + desc->linear_ranges = rtq2208_vout_range; + desc->n_linear_ranges = ARRAY_SIZE(rtq2208_vout_range); + desc->ramp_reg = BUCK_RG_SHIFT(curr_info->base, 5); + desc->active_discharge_reg = curr_info->base; + desc->of_map_mode = rtq2208_of_map_mode; + + rdesc->mode_reg = BUCK_RG_SHIFT(curr_info->base, 2); + rdesc->suspend_config_reg = BUCK_RG_SHIFT(curr_info->base, 4); + rdesc->suspend_enable_mask = RTQ2208_BUCK_EN_STR_MASK; + rdesc->suspend_mode_mask = RTQ2208_BUCK_STRMODE_MASK; + } else { + /* init ldo desc */ + desc->enable_reg = curr_info->base; + desc->ops = &rtq2208_regulator_ldo_ops; + desc->n_voltages = 1; + desc->active_discharge_reg = LDO_RG_SHIFT(curr_info->base, 2); + + rtq2208_ldo_match[*ldo_idx].name = desc->name; + rtq2208_ldo_match[*ldo_idx].driver_data = rdesc; + rtq2208_ldo_match[(*ldo_idx)++].desc = desc; + + rdesc->suspend_config_reg = curr_info->base; + rdesc->suspend_enable_mask = RTQ2208_LDO_EN_STR_MASK; + } +} + +static int rtq2208_parse_regulator_dt_data(int n_regulator, const unsigned int *regulator_idx_table, + struct rtq2208_regulator_desc *rdesc[RTQ2208_LDO_MAX], struct device *dev) +{ + struct of_regulator_match rtq2208_ldo_match[2]; + int mtp_sel, ret, i, idx, ldo_idx = 0; + + /* get mtp_sel0 or mtp_sel1 */ + mtp_sel = device_property_read_bool(dev, "richtek,mtp-sel-high"); + + for (i = 0; i < n_regulator; i++) { + idx = regulator_idx_table[i]; + + rdesc[i] = devm_kcalloc(dev, 1, sizeof(*rdesc[0]), GFP_KERNEL); + if (!rdesc[i]) + return -ENOMEM; + + rtq2208_init_regulator_desc(rdesc[i], mtp_sel, idx, rtq2208_ldo_match, &ldo_idx); + } + + /* init ldo fixed_uV */ + ret = rtq2208_of_get_fixed_voltage(dev, rtq2208_ldo_match, ldo_idx); + if (ret) + return dev_err_probe(dev, ret, "Failed to get ldo fixed_uV\n"); + + return 0; + +} + +/** different slave address corresponds different used bucks + * slave address 0x10: BUCK[BCA FGE] + * slave address 0x20: BUCK[BC FGHE] + * slave address 0x40: BUCK[C G] + */ +static int rtq2208_regulator_check(int slave_addr, int *num, + int *regulator_idx_table, unsigned int *buck_masks) +{ + static bool rtq2208_used_table[3][RTQ2208_LDO_MAX] = { + /* BUCK[BCA FGE], LDO[12] */ + {1, 1, 0, 1, 1, 1, 0, 1, 1, 1}, + /* BUCK[BC FGHE], LDO[12]*/ + {1, 1, 0, 0, 1, 1, 1, 1, 1, 1}, + /* BUCK[C G], LDO[12] */ + {0, 1, 0, 0, 0, 1, 0, 0, 1, 1}, + }; + int i, idx = ffs(slave_addr >> 4) - 1; + u8 mask; + + for (i = 0; i < RTQ2208_LDO_MAX; i++) { + if (!rtq2208_used_table[idx][i]) + continue; + + regulator_idx_table[(*num)++] = i; + + mask = RTQ2208_BUCK_MASK(4 * i, 4 * i + 1); + buck_masks[i >> 1] &= ~mask; + } + + return 0; +} + +static const struct regmap_config rtq2208_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = 0xEF, +}; + +static int rtq2208_probe(struct i2c_client *i2c) +{ + struct device *dev = &i2c->dev; + struct regmap *regmap; + struct rtq2208_regulator_desc *rdesc[RTQ2208_LDO_MAX]; + struct regulator_dev *rdev; + struct regulator_config cfg; + struct rtq2208_rdev_map *rdev_map; + int i, ret = 0, idx, n_regulator = 0; + unsigned int regulator_idx_table[RTQ2208_LDO_MAX], + buck_masks[RTQ2208_BUCK_NUM_IRQ_REGS] = {0x33, 0x33, 0x33, 0x33, 0x33}; + + rdev_map = devm_kzalloc(dev, sizeof(struct rtq2208_rdev_map), GFP_KERNEL); + if (!rdev_map) + return -ENOMEM; + + regmap = devm_regmap_init_i2c(i2c, &rtq2208_regmap_config); + if (IS_ERR(regmap)) + return dev_err_probe(dev, PTR_ERR(regmap), "Failed to allocate regmap\n"); + + /* get needed regulator */ + ret = rtq2208_regulator_check(i2c->addr, &n_regulator, regulator_idx_table, buck_masks); + if (ret) + return dev_err_probe(dev, ret, "Failed to check used regulators\n"); + + rdev_map->regmap = regmap; + rdev_map->dev = dev; + + cfg.dev = dev; + + /* init regulator desc */ + ret = rtq2208_parse_regulator_dt_data(n_regulator, regulator_idx_table, rdesc, dev); + if (ret) + return ret; + + for (i = 0; i < n_regulator; i++) { + idx = regulator_idx_table[i]; + + /* register regulator */ + rdev = devm_regulator_register(dev, &rdesc[i]->desc, &cfg); + if (IS_ERR(rdev)) + return PTR_ERR(rdev); + + rdev_map->rdev[idx] = rdev; + } + + /* init interrupt mask */ + ret = rtq2208_init_irq_mask(rdev_map, buck_masks); + if (ret) + return ret; + + /* register interrupt */ + return devm_request_threaded_irq(dev, i2c->irq, NULL, rtq2208_irq_handler, + IRQF_ONESHOT, dev_name(dev), rdev_map); +} + +static const struct of_device_id rtq2208_device_tables[] = { + { .compatible = "richtek,rtq2208" }, + {} +}; +MODULE_DEVICE_TABLE(of, rtq2208_device_tables); + +static struct i2c_driver rtq2208_driver = { + .driver = { + .name = "rtq2208", + .of_match_table = rtq2208_device_tables, + }, + .probe = rtq2208_probe, +}; +module_i2c_driver(rtq2208_driver); + +MODULE_AUTHOR("Alina Yu <alina_yu@richtek.com>"); +MODULE_DESCRIPTION("Richtek RTQ2208 Regulator Driver"); +MODULE_LICENSE("GPL"); |