--- /dev/null
+/**
+ * uniphier_thermal.c - Socionext UniPhier thermal driver
+ *
+ * Copyright 2014 Panasonic Corporation
+ * Copyright 2016-2017 Socionext Inc.
+ * All rights reserved.
+ *
+ * Author:
+ * Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 of
+ * the License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#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,
+ },
+ { /* 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");
projects / platform / kernel / linux-rpi.git / commitdiff