| // SPDX-License-Identifier: GPL-2.0 |
| /** |
| * uniphier_thermal.c - Socionext UniPhier thermal driver |
| * Copyright 2014 Panasonic Corporation |
| * Copyright 2016-2017 Socionext Inc. |
| * Author: |
| * Kunihiko Hayashi <hayashi.kunihiko@socionext.com> |
| */ |
| |
| #include <linux/bitops.h> |
| #include <linux/interrupt.h> |
| #include <linux/mfd/syscon.h> |
| #include <linux/module.h> |
| #include <linux/of.h> |
| #include <linux/of_device.h> |
| #include <linux/platform_device.h> |
| #include <linux/regmap.h> |
| #include <linux/thermal.h> |
| |
| #include "thermal_core.h" |
| |
| /* |
| * block registers |
| * addresses are the offset from .block_base |
| */ |
| #define PVTCTLEN 0x0000 |
| #define PVTCTLEN_EN BIT(0) |
| |
| #define PVTCTLMODE 0x0004 |
| #define PVTCTLMODE_MASK 0xf |
| #define PVTCTLMODE_TEMPMON 0x5 |
| |
| #define EMONREPEAT 0x0040 |
| #define EMONREPEAT_ENDLESS BIT(24) |
| #define EMONREPEAT_PERIOD GENMASK(3, 0) |
| #define EMONREPEAT_PERIOD_1000000 0x9 |
| |
| /* |
| * common registers |
| * addresses are the offset from .map_base |
| */ |
| #define PVTCTLSEL 0x0900 |
| #define PVTCTLSEL_MASK GENMASK(2, 0) |
| #define PVTCTLSEL_MONITOR 0 |
| |
| #define SETALERT0 0x0910 |
| #define SETALERT1 0x0914 |
| #define SETALERT2 0x0918 |
| #define SETALERT_TEMP_OVF (GENMASK(7, 0) << 16) |
| #define SETALERT_TEMP_OVF_VALUE(val) (((val) & GENMASK(7, 0)) << 16) |
| #define SETALERT_EN BIT(0) |
| |
| #define PMALERTINTCTL 0x0920 |
| #define PMALERTINTCTL_CLR(ch) BIT(4 * (ch) + 2) |
| #define PMALERTINTCTL_SET(ch) BIT(4 * (ch) + 1) |
| #define PMALERTINTCTL_EN(ch) BIT(4 * (ch) + 0) |
| #define PMALERTINTCTL_MASK (GENMASK(10, 8) | GENMASK(6, 4) | \ |
| GENMASK(2, 0)) |
| |
| #define TMOD 0x0928 |
| #define TMOD_WIDTH 9 |
| |
| #define TMODCOEF 0x0e5c |
| |
| #define TMODSETUP0_EN BIT(30) |
| #define TMODSETUP0_VAL(val) (((val) & GENMASK(13, 0)) << 16) |
| #define TMODSETUP1_EN BIT(15) |
| #define TMODSETUP1_VAL(val) ((val) & GENMASK(14, 0)) |
| |
| /* SoC critical temperature */ |
| #define CRITICAL_TEMP_LIMIT (120 * 1000) |
| |
| /* Max # of alert channels */ |
| #define ALERT_CH_NUM 3 |
| |
| /* SoC specific thermal sensor data */ |
| struct uniphier_tm_soc_data { |
| u32 map_base; |
| u32 block_base; |
| u32 tmod_setup_addr; |
| }; |
| |
| struct uniphier_tm_dev { |
| struct regmap *regmap; |
| struct device *dev; |
| bool alert_en[ALERT_CH_NUM]; |
| struct thermal_zone_device *tz_dev; |
| const struct uniphier_tm_soc_data *data; |
| }; |
| |
| static int uniphier_tm_initialize_sensor(struct uniphier_tm_dev *tdev) |
| { |
| struct regmap *map = tdev->regmap; |
| u32 val; |
| u32 tmod_calib[2]; |
| int ret; |
| |
| /* stop PVT */ |
| regmap_write_bits(map, tdev->data->block_base + PVTCTLEN, |
| PVTCTLEN_EN, 0); |
| |
| /* |
| * Since SoC has a calibrated value that was set in advance, |
| * TMODCOEF shows non-zero and PVT refers the value internally. |
| * |
| * If TMODCOEF shows zero, the boards don't have the calibrated |
| * value, and the driver has to set default value from DT. |
| */ |
| ret = regmap_read(map, tdev->data->map_base + TMODCOEF, &val); |
| if (ret) |
| return ret; |
| if (!val) { |
| /* look for the default values in DT */ |
| ret = of_property_read_u32_array(tdev->dev->of_node, |
| "socionext,tmod-calibration", |
| tmod_calib, |
| ARRAY_SIZE(tmod_calib)); |
| if (ret) |
| return ret; |
| |
| regmap_write(map, tdev->data->tmod_setup_addr, |
| TMODSETUP0_EN | TMODSETUP0_VAL(tmod_calib[0]) | |
| TMODSETUP1_EN | TMODSETUP1_VAL(tmod_calib[1])); |
| } |
| |
| /* select temperature mode */ |
| regmap_write_bits(map, tdev->data->block_base + PVTCTLMODE, |
| PVTCTLMODE_MASK, PVTCTLMODE_TEMPMON); |
| |
| /* set monitoring period */ |
| regmap_write_bits(map, tdev->data->block_base + EMONREPEAT, |
| EMONREPEAT_ENDLESS | EMONREPEAT_PERIOD, |
| EMONREPEAT_ENDLESS | EMONREPEAT_PERIOD_1000000); |
| |
| /* set monitor mode */ |
| regmap_write_bits(map, tdev->data->map_base + PVTCTLSEL, |
| PVTCTLSEL_MASK, PVTCTLSEL_MONITOR); |
| |
| return 0; |
| } |
| |
| static void uniphier_tm_set_alert(struct uniphier_tm_dev *tdev, u32 ch, |
| u32 temp) |
| { |
| struct regmap *map = tdev->regmap; |
| |
| /* set alert temperature */ |
| regmap_write_bits(map, tdev->data->map_base + SETALERT0 + (ch << 2), |
| SETALERT_EN | SETALERT_TEMP_OVF, |
| SETALERT_EN | |
| SETALERT_TEMP_OVF_VALUE(temp / 1000)); |
| } |
| |
| static void uniphier_tm_enable_sensor(struct uniphier_tm_dev *tdev) |
| { |
| struct regmap *map = tdev->regmap; |
| int i; |
| u32 bits = 0; |
| |
| for (i = 0; i < ALERT_CH_NUM; i++) |
| if (tdev->alert_en[i]) |
| bits |= PMALERTINTCTL_EN(i); |
| |
| /* enable alert interrupt */ |
| regmap_write_bits(map, tdev->data->map_base + PMALERTINTCTL, |
| PMALERTINTCTL_MASK, bits); |
| |
| /* start PVT */ |
| regmap_write_bits(map, tdev->data->block_base + PVTCTLEN, |
| PVTCTLEN_EN, PVTCTLEN_EN); |
| |
| usleep_range(700, 1500); /* The spec note says at least 700us */ |
| } |
| |
| static void uniphier_tm_disable_sensor(struct uniphier_tm_dev *tdev) |
| { |
| struct regmap *map = tdev->regmap; |
| |
| /* disable alert interrupt */ |
| regmap_write_bits(map, tdev->data->map_base + PMALERTINTCTL, |
| PMALERTINTCTL_MASK, 0); |
| |
| /* stop PVT */ |
| regmap_write_bits(map, tdev->data->block_base + PVTCTLEN, |
| PVTCTLEN_EN, 0); |
| |
| usleep_range(1000, 2000); /* The spec note says at least 1ms */ |
| } |
| |
| static int uniphier_tm_get_temp(void *data, int *out_temp) |
| { |
| struct uniphier_tm_dev *tdev = data; |
| struct regmap *map = tdev->regmap; |
| int ret; |
| u32 temp; |
| |
| ret = regmap_read(map, tdev->data->map_base + TMOD, &temp); |
| if (ret) |
| return ret; |
| |
| /* MSB of the TMOD field is a sign bit */ |
| *out_temp = sign_extend32(temp, TMOD_WIDTH - 1) * 1000; |
| |
| return 0; |
| } |
| |
| static const struct thermal_zone_of_device_ops uniphier_of_thermal_ops = { |
| .get_temp = uniphier_tm_get_temp, |
| }; |
| |
| static void uniphier_tm_irq_clear(struct uniphier_tm_dev *tdev) |
| { |
| u32 mask = 0, bits = 0; |
| int i; |
| |
| for (i = 0; i < ALERT_CH_NUM; i++) { |
| mask |= (PMALERTINTCTL_CLR(i) | PMALERTINTCTL_SET(i)); |
| bits |= PMALERTINTCTL_CLR(i); |
| } |
| |
| /* clear alert interrupt */ |
| regmap_write_bits(tdev->regmap, |
| tdev->data->map_base + PMALERTINTCTL, mask, bits); |
| } |
| |
| static irqreturn_t uniphier_tm_alarm_irq(int irq, void *_tdev) |
| { |
| struct uniphier_tm_dev *tdev = _tdev; |
| |
| disable_irq_nosync(irq); |
| uniphier_tm_irq_clear(tdev); |
| |
| return IRQ_WAKE_THREAD; |
| } |
| |
| static irqreturn_t uniphier_tm_alarm_irq_thread(int irq, void *_tdev) |
| { |
| struct uniphier_tm_dev *tdev = _tdev; |
| |
| thermal_zone_device_update(tdev->tz_dev, THERMAL_EVENT_UNSPECIFIED); |
| |
| return IRQ_HANDLED; |
| } |
| |
| static int uniphier_tm_probe(struct platform_device *pdev) |
| { |
| struct device *dev = &pdev->dev; |
| struct regmap *regmap; |
| struct device_node *parent; |
| struct uniphier_tm_dev *tdev; |
| const struct thermal_trip *trips; |
| int i, ret, irq, ntrips, crit_temp = INT_MAX; |
| |
| tdev = devm_kzalloc(dev, sizeof(*tdev), GFP_KERNEL); |
| if (!tdev) |
| return -ENOMEM; |
| tdev->dev = dev; |
| |
| tdev->data = of_device_get_match_data(dev); |
| if (WARN_ON(!tdev->data)) |
| return -EINVAL; |
| |
| irq = platform_get_irq(pdev, 0); |
| if (irq < 0) |
| return irq; |
| |
| /* get regmap from syscon node */ |
| parent = of_get_parent(dev->of_node); /* parent should be syscon node */ |
| regmap = syscon_node_to_regmap(parent); |
| of_node_put(parent); |
| if (IS_ERR(regmap)) { |
| dev_err(dev, "failed to get regmap (error %ld)\n", |
| PTR_ERR(regmap)); |
| return PTR_ERR(regmap); |
| } |
| tdev->regmap = regmap; |
| |
| ret = uniphier_tm_initialize_sensor(tdev); |
| if (ret) { |
| dev_err(dev, "failed to initialize sensor\n"); |
| return ret; |
| } |
| |
| ret = devm_request_threaded_irq(dev, irq, uniphier_tm_alarm_irq, |
| uniphier_tm_alarm_irq_thread, |
| 0, "thermal", tdev); |
| if (ret) |
| return ret; |
| |
| platform_set_drvdata(pdev, tdev); |
| |
| tdev->tz_dev = devm_thermal_zone_of_sensor_register(dev, 0, tdev, |
| &uniphier_of_thermal_ops); |
| if (IS_ERR(tdev->tz_dev)) { |
| dev_err(dev, "failed to register sensor device\n"); |
| return PTR_ERR(tdev->tz_dev); |
| } |
| |
| /* get trip points */ |
| trips = of_thermal_get_trip_points(tdev->tz_dev); |
| ntrips = of_thermal_get_ntrips(tdev->tz_dev); |
| if (ntrips > ALERT_CH_NUM) { |
| dev_err(dev, "thermal zone has too many trips\n"); |
| return -E2BIG; |
| } |
| |
| /* set alert temperatures */ |
| for (i = 0; i < ntrips; i++) { |
| if (trips[i].type == THERMAL_TRIP_CRITICAL && |
| trips[i].temperature < crit_temp) |
| crit_temp = trips[i].temperature; |
| uniphier_tm_set_alert(tdev, i, trips[i].temperature); |
| tdev->alert_en[i] = true; |
| } |
| if (crit_temp > CRITICAL_TEMP_LIMIT) { |
| dev_err(dev, "critical trip is over limit(>%d), or not set\n", |
| CRITICAL_TEMP_LIMIT); |
| return -EINVAL; |
| } |
| |
| uniphier_tm_enable_sensor(tdev); |
| |
| return 0; |
| } |
| |
| static int uniphier_tm_remove(struct platform_device *pdev) |
| { |
| struct uniphier_tm_dev *tdev = platform_get_drvdata(pdev); |
| |
| /* disable sensor */ |
| uniphier_tm_disable_sensor(tdev); |
| |
| return 0; |
| } |
| |
| static const struct uniphier_tm_soc_data uniphier_pxs2_tm_data = { |
| .map_base = 0xe000, |
| .block_base = 0xe000, |
| .tmod_setup_addr = 0xe904, |
| }; |
| |
| static const struct uniphier_tm_soc_data uniphier_ld20_tm_data = { |
| .map_base = 0xe000, |
| .block_base = 0xe800, |
| .tmod_setup_addr = 0xe938, |
| }; |
| |
| static const struct of_device_id uniphier_tm_dt_ids[] = { |
| { |
| .compatible = "socionext,uniphier-pxs2-thermal", |
| .data = &uniphier_pxs2_tm_data, |
| }, |
| { |
| .compatible = "socionext,uniphier-ld20-thermal", |
| .data = &uniphier_ld20_tm_data, |
| }, |
| { |
| .compatible = "socionext,uniphier-pxs3-thermal", |
| .data = &uniphier_ld20_tm_data, |
| }, |
| { /* sentinel */ } |
| }; |
| MODULE_DEVICE_TABLE(of, uniphier_tm_dt_ids); |
| |
| static struct platform_driver uniphier_tm_driver = { |
| .probe = uniphier_tm_probe, |
| .remove = uniphier_tm_remove, |
| .driver = { |
| .name = "uniphier-thermal", |
| .of_match_table = uniphier_tm_dt_ids, |
| }, |
| }; |
| module_platform_driver(uniphier_tm_driver); |
| |
| MODULE_AUTHOR("Kunihiko Hayashi <hayashi.kunihiko@socionext.com>"); |
| MODULE_DESCRIPTION("UniPhier thermal driver"); |
| MODULE_LICENSE("GPL v2"); |