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-rw-r--r--drivers/thermal/rcar_thermal.c590
1 files changed, 590 insertions, 0 deletions
diff --git a/drivers/thermal/rcar_thermal.c b/drivers/thermal/rcar_thermal.c
new file mode 100644
index 0000000000..293f8dd9fe
--- /dev/null
+++ b/drivers/thermal/rcar_thermal.c
@@ -0,0 +1,590 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * R-Car THS/TSC thermal sensor driver
+ *
+ * Copyright (C) 2012 Renesas Solutions Corp.
+ * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
+ */
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/reboot.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/thermal.h>
+
+#include "thermal_hwmon.h"
+
+#define IDLE_INTERVAL 5000
+
+#define COMMON_STR 0x00
+#define COMMON_ENR 0x04
+#define COMMON_INTMSK 0x0c
+
+#define REG_POSNEG 0x20
+#define REG_FILONOFF 0x28
+#define REG_THSCR 0x2c
+#define REG_THSSR 0x30
+#define REG_INTCTRL 0x34
+
+/* THSCR */
+#define CPCTL (1 << 12)
+
+/* THSSR */
+#define CTEMP 0x3f
+
+struct rcar_thermal_common {
+ void __iomem *base;
+ struct device *dev;
+ struct list_head head;
+ spinlock_t lock;
+};
+
+struct rcar_thermal_chip {
+ unsigned int use_of_thermal : 1;
+ unsigned int has_filonoff : 1;
+ unsigned int irq_per_ch : 1;
+ unsigned int needs_suspend_resume : 1;
+ unsigned int nirqs;
+ unsigned int ctemp_bands;
+};
+
+static const struct rcar_thermal_chip rcar_thermal = {
+ .use_of_thermal = 0,
+ .has_filonoff = 1,
+ .irq_per_ch = 0,
+ .needs_suspend_resume = 0,
+ .nirqs = 1,
+ .ctemp_bands = 1,
+};
+
+static const struct rcar_thermal_chip rcar_gen2_thermal = {
+ .use_of_thermal = 1,
+ .has_filonoff = 1,
+ .irq_per_ch = 0,
+ .needs_suspend_resume = 0,
+ .nirqs = 1,
+ .ctemp_bands = 1,
+};
+
+static const struct rcar_thermal_chip rcar_gen3_thermal = {
+ .use_of_thermal = 1,
+ .has_filonoff = 0,
+ .irq_per_ch = 1,
+ .needs_suspend_resume = 1,
+ /*
+ * The Gen3 chip has 3 interrupts, but this driver uses only 2
+ * interrupts to detect a temperature change, rise or fall.
+ */
+ .nirqs = 2,
+ .ctemp_bands = 2,
+};
+
+struct rcar_thermal_priv {
+ void __iomem *base;
+ struct rcar_thermal_common *common;
+ struct thermal_zone_device *zone;
+ const struct rcar_thermal_chip *chip;
+ struct delayed_work work;
+ struct mutex lock;
+ struct list_head list;
+ int id;
+};
+
+#define rcar_thermal_for_each_priv(pos, common) \
+ list_for_each_entry(pos, &common->head, list)
+
+#define MCELSIUS(temp) ((temp) * 1000)
+#define rcar_priv_to_dev(priv) ((priv)->common->dev)
+#define rcar_has_irq_support(priv) ((priv)->common->base)
+#define rcar_id_to_shift(priv) ((priv)->id * 8)
+
+static const struct of_device_id rcar_thermal_dt_ids[] = {
+ {
+ .compatible = "renesas,rcar-thermal",
+ .data = &rcar_thermal,
+ },
+ {
+ .compatible = "renesas,rcar-gen2-thermal",
+ .data = &rcar_gen2_thermal,
+ },
+ {
+ .compatible = "renesas,thermal-r8a774c0",
+ .data = &rcar_gen3_thermal,
+ },
+ {
+ .compatible = "renesas,thermal-r8a77970",
+ .data = &rcar_gen3_thermal,
+ },
+ {
+ .compatible = "renesas,thermal-r8a77990",
+ .data = &rcar_gen3_thermal,
+ },
+ {
+ .compatible = "renesas,thermal-r8a77995",
+ .data = &rcar_gen3_thermal,
+ },
+ {},
+};
+MODULE_DEVICE_TABLE(of, rcar_thermal_dt_ids);
+
+/*
+ * basic functions
+ */
+#define rcar_thermal_common_read(c, r) \
+ _rcar_thermal_common_read(c, COMMON_ ##r)
+static u32 _rcar_thermal_common_read(struct rcar_thermal_common *common,
+ u32 reg)
+{
+ return ioread32(common->base + reg);
+}
+
+#define rcar_thermal_common_write(c, r, d) \
+ _rcar_thermal_common_write(c, COMMON_ ##r, d)
+static void _rcar_thermal_common_write(struct rcar_thermal_common *common,
+ u32 reg, u32 data)
+{
+ iowrite32(data, common->base + reg);
+}
+
+#define rcar_thermal_common_bset(c, r, m, d) \
+ _rcar_thermal_common_bset(c, COMMON_ ##r, m, d)
+static void _rcar_thermal_common_bset(struct rcar_thermal_common *common,
+ u32 reg, u32 mask, u32 data)
+{
+ u32 val;
+
+ val = ioread32(common->base + reg);
+ val &= ~mask;
+ val |= (data & mask);
+ iowrite32(val, common->base + reg);
+}
+
+#define rcar_thermal_read(p, r) _rcar_thermal_read(p, REG_ ##r)
+static u32 _rcar_thermal_read(struct rcar_thermal_priv *priv, u32 reg)
+{
+ return ioread32(priv->base + reg);
+}
+
+#define rcar_thermal_write(p, r, d) _rcar_thermal_write(p, REG_ ##r, d)
+static void _rcar_thermal_write(struct rcar_thermal_priv *priv,
+ u32 reg, u32 data)
+{
+ iowrite32(data, priv->base + reg);
+}
+
+#define rcar_thermal_bset(p, r, m, d) _rcar_thermal_bset(p, REG_ ##r, m, d)
+static void _rcar_thermal_bset(struct rcar_thermal_priv *priv, u32 reg,
+ u32 mask, u32 data)
+{
+ u32 val;
+
+ val = ioread32(priv->base + reg);
+ val &= ~mask;
+ val |= (data & mask);
+ iowrite32(val, priv->base + reg);
+}
+
+/*
+ * zone device functions
+ */
+static int rcar_thermal_update_temp(struct rcar_thermal_priv *priv)
+{
+ struct device *dev = rcar_priv_to_dev(priv);
+ int old, new, ctemp = -EINVAL;
+ unsigned int i;
+
+ mutex_lock(&priv->lock);
+
+ /*
+ * TSC decides a value of CPTAP automatically,
+ * and this is the conditions which validate interrupt.
+ */
+ rcar_thermal_bset(priv, THSCR, CPCTL, CPCTL);
+
+ old = ~0;
+ for (i = 0; i < 128; i++) {
+ /*
+ * we need to wait 300us after changing comparator offset
+ * to get stable temperature.
+ * see "Usage Notes" on datasheet
+ */
+ usleep_range(300, 400);
+
+ new = rcar_thermal_read(priv, THSSR) & CTEMP;
+ if (new == old) {
+ ctemp = new;
+ break;
+ }
+ old = new;
+ }
+
+ if (ctemp < 0) {
+ dev_err(dev, "thermal sensor was broken\n");
+ goto err_out_unlock;
+ }
+
+ /*
+ * enable IRQ
+ */
+ if (rcar_has_irq_support(priv)) {
+ if (priv->chip->has_filonoff)
+ rcar_thermal_write(priv, FILONOFF, 0);
+
+ /* enable Rising/Falling edge interrupt */
+ rcar_thermal_write(priv, POSNEG, 0x1);
+ rcar_thermal_write(priv, INTCTRL, (((ctemp - 0) << 8) |
+ ((ctemp - 1) << 0)));
+ }
+
+err_out_unlock:
+ mutex_unlock(&priv->lock);
+
+ return ctemp;
+}
+
+static int rcar_thermal_get_current_temp(struct rcar_thermal_priv *priv,
+ int *temp)
+{
+ int ctemp;
+
+ ctemp = rcar_thermal_update_temp(priv);
+ if (ctemp < 0)
+ return ctemp;
+
+ /* Guaranteed operating range is -45C to 125C. */
+
+ if (priv->chip->ctemp_bands == 1)
+ *temp = MCELSIUS((ctemp * 5) - 65);
+ else if (ctemp < 24)
+ *temp = MCELSIUS(((ctemp * 55) - 720) / 10);
+ else
+ *temp = MCELSIUS((ctemp * 5) - 60);
+
+ return 0;
+}
+
+static int rcar_thermal_get_temp(struct thermal_zone_device *zone, int *temp)
+{
+ struct rcar_thermal_priv *priv = thermal_zone_device_priv(zone);
+
+ return rcar_thermal_get_current_temp(priv, temp);
+}
+
+static struct thermal_zone_device_ops rcar_thermal_zone_ops = {
+ .get_temp = rcar_thermal_get_temp,
+};
+
+static struct thermal_trip trips[] = {
+ { .type = THERMAL_TRIP_CRITICAL, .temperature = 90000 }
+};
+
+/*
+ * interrupt
+ */
+#define rcar_thermal_irq_enable(p) _rcar_thermal_irq_ctrl(p, 1)
+#define rcar_thermal_irq_disable(p) _rcar_thermal_irq_ctrl(p, 0)
+static void _rcar_thermal_irq_ctrl(struct rcar_thermal_priv *priv, int enable)
+{
+ struct rcar_thermal_common *common = priv->common;
+ unsigned long flags;
+ u32 mask = 0x3 << rcar_id_to_shift(priv); /* enable Rising/Falling */
+
+ if (!rcar_has_irq_support(priv))
+ return;
+
+ spin_lock_irqsave(&common->lock, flags);
+
+ rcar_thermal_common_bset(common, INTMSK, mask, enable ? 0 : mask);
+
+ spin_unlock_irqrestore(&common->lock, flags);
+}
+
+static void rcar_thermal_work(struct work_struct *work)
+{
+ struct rcar_thermal_priv *priv;
+ int ret;
+
+ priv = container_of(work, struct rcar_thermal_priv, work.work);
+
+ ret = rcar_thermal_update_temp(priv);
+ if (ret < 0)
+ return;
+
+ rcar_thermal_irq_enable(priv);
+
+ thermal_zone_device_update(priv->zone, THERMAL_EVENT_UNSPECIFIED);
+}
+
+static u32 rcar_thermal_had_changed(struct rcar_thermal_priv *priv, u32 status)
+{
+ struct device *dev = rcar_priv_to_dev(priv);
+
+ status = (status >> rcar_id_to_shift(priv)) & 0x3;
+
+ if (status) {
+ dev_dbg(dev, "thermal%d %s%s\n",
+ priv->id,
+ (status & 0x2) ? "Rising " : "",
+ (status & 0x1) ? "Falling" : "");
+ }
+
+ return status;
+}
+
+static irqreturn_t rcar_thermal_irq(int irq, void *data)
+{
+ struct rcar_thermal_common *common = data;
+ struct rcar_thermal_priv *priv;
+ u32 status, mask;
+
+ spin_lock(&common->lock);
+
+ mask = rcar_thermal_common_read(common, INTMSK);
+ status = rcar_thermal_common_read(common, STR);
+ rcar_thermal_common_write(common, STR, 0x000F0F0F & mask);
+
+ spin_unlock(&common->lock);
+
+ status = status & ~mask;
+
+ /*
+ * check the status
+ */
+ rcar_thermal_for_each_priv(priv, common) {
+ if (rcar_thermal_had_changed(priv, status)) {
+ rcar_thermal_irq_disable(priv);
+ queue_delayed_work(system_freezable_wq, &priv->work,
+ msecs_to_jiffies(300));
+ }
+ }
+
+ return IRQ_HANDLED;
+}
+
+/*
+ * platform functions
+ */
+static int rcar_thermal_remove(struct platform_device *pdev)
+{
+ struct rcar_thermal_common *common = platform_get_drvdata(pdev);
+ struct device *dev = &pdev->dev;
+ struct rcar_thermal_priv *priv;
+
+ rcar_thermal_for_each_priv(priv, common) {
+ rcar_thermal_irq_disable(priv);
+ cancel_delayed_work_sync(&priv->work);
+ if (priv->chip->use_of_thermal)
+ thermal_remove_hwmon_sysfs(priv->zone);
+ else
+ thermal_zone_device_unregister(priv->zone);
+ }
+
+ pm_runtime_put(dev);
+ pm_runtime_disable(dev);
+
+ return 0;
+}
+
+static int rcar_thermal_probe(struct platform_device *pdev)
+{
+ struct rcar_thermal_common *common;
+ struct rcar_thermal_priv *priv;
+ struct device *dev = &pdev->dev;
+ struct resource *res;
+ const struct rcar_thermal_chip *chip = of_device_get_match_data(dev);
+ int mres = 0;
+ int i;
+ int ret = -ENODEV;
+ int idle = IDLE_INTERVAL;
+ u32 enr_bits = 0;
+
+ common = devm_kzalloc(dev, sizeof(*common), GFP_KERNEL);
+ if (!common)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, common);
+
+ INIT_LIST_HEAD(&common->head);
+ spin_lock_init(&common->lock);
+ common->dev = dev;
+
+ pm_runtime_enable(dev);
+ pm_runtime_get_sync(dev);
+
+ for (i = 0; i < chip->nirqs; i++) {
+ int irq;
+
+ ret = platform_get_irq_optional(pdev, i);
+ if (ret < 0 && ret != -ENXIO)
+ goto error_unregister;
+ if (ret > 0)
+ irq = ret;
+ else
+ break;
+
+ if (!common->base) {
+ /*
+ * platform has IRQ support.
+ * Then, driver uses common registers
+ * rcar_has_irq_support() will be enabled
+ */
+ res = platform_get_resource(pdev, IORESOURCE_MEM,
+ mres++);
+ common->base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(common->base)) {
+ ret = PTR_ERR(common->base);
+ goto error_unregister;
+ }
+
+ idle = 0; /* polling delay is not needed */
+ }
+
+ ret = devm_request_irq(dev, irq, rcar_thermal_irq,
+ IRQF_SHARED, dev_name(dev), common);
+ if (ret) {
+ dev_err(dev, "irq request failed\n ");
+ goto error_unregister;
+ }
+
+ /* update ENR bits */
+ if (chip->irq_per_ch)
+ enr_bits |= 1 << i;
+ }
+
+ for (i = 0;; i++) {
+ res = platform_get_resource(pdev, IORESOURCE_MEM, mres++);
+ if (!res)
+ break;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv) {
+ ret = -ENOMEM;
+ goto error_unregister;
+ }
+
+ priv->base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(priv->base)) {
+ ret = PTR_ERR(priv->base);
+ goto error_unregister;
+ }
+
+ priv->common = common;
+ priv->id = i;
+ priv->chip = chip;
+ mutex_init(&priv->lock);
+ INIT_LIST_HEAD(&priv->list);
+ INIT_DELAYED_WORK(&priv->work, rcar_thermal_work);
+ ret = rcar_thermal_update_temp(priv);
+ if (ret < 0)
+ goto error_unregister;
+
+ if (chip->use_of_thermal) {
+ priv->zone = devm_thermal_of_zone_register(
+ dev, i, priv,
+ &rcar_thermal_zone_ops);
+ } else {
+ priv->zone = thermal_zone_device_register_with_trips(
+ "rcar_thermal", trips, ARRAY_SIZE(trips), 0, priv,
+ &rcar_thermal_zone_ops, NULL, 0,
+ idle);
+
+ ret = thermal_zone_device_enable(priv->zone);
+ if (ret) {
+ thermal_zone_device_unregister(priv->zone);
+ priv->zone = ERR_PTR(ret);
+ }
+ }
+ if (IS_ERR(priv->zone)) {
+ dev_err(dev, "can't register thermal zone\n");
+ ret = PTR_ERR(priv->zone);
+ priv->zone = NULL;
+ goto error_unregister;
+ }
+
+ if (chip->use_of_thermal) {
+ ret = thermal_add_hwmon_sysfs(priv->zone);
+ if (ret)
+ goto error_unregister;
+ }
+
+ rcar_thermal_irq_enable(priv);
+
+ list_move_tail(&priv->list, &common->head);
+
+ /* update ENR bits */
+ if (!chip->irq_per_ch)
+ enr_bits |= 3 << (i * 8);
+ }
+
+ if (common->base && enr_bits)
+ rcar_thermal_common_write(common, ENR, enr_bits);
+
+ dev_info(dev, "%d sensor probed\n", i);
+
+ return 0;
+
+error_unregister:
+ rcar_thermal_remove(pdev);
+
+ return ret;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int rcar_thermal_suspend(struct device *dev)
+{
+ struct rcar_thermal_common *common = dev_get_drvdata(dev);
+ struct rcar_thermal_priv *priv = list_first_entry(&common->head,
+ typeof(*priv), list);
+
+ if (priv->chip->needs_suspend_resume) {
+ rcar_thermal_common_write(common, ENR, 0);
+ rcar_thermal_irq_disable(priv);
+ rcar_thermal_bset(priv, THSCR, CPCTL, 0);
+ }
+
+ return 0;
+}
+
+static int rcar_thermal_resume(struct device *dev)
+{
+ struct rcar_thermal_common *common = dev_get_drvdata(dev);
+ struct rcar_thermal_priv *priv = list_first_entry(&common->head,
+ typeof(*priv), list);
+ int ret;
+
+ if (priv->chip->needs_suspend_resume) {
+ ret = rcar_thermal_update_temp(priv);
+ if (ret < 0)
+ return ret;
+ rcar_thermal_irq_enable(priv);
+ rcar_thermal_common_write(common, ENR, 0x03);
+ }
+
+ return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(rcar_thermal_pm_ops, rcar_thermal_suspend,
+ rcar_thermal_resume);
+
+static struct platform_driver rcar_thermal_driver = {
+ .driver = {
+ .name = "rcar_thermal",
+ .pm = &rcar_thermal_pm_ops,
+ .of_match_table = rcar_thermal_dt_ids,
+ },
+ .probe = rcar_thermal_probe,
+ .remove = rcar_thermal_remove,
+};
+module_platform_driver(rcar_thermal_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("R-Car THS/TSC thermal sensor driver");
+MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-14 02:18:05 +0000