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path: root/drivers/thermal/rcar_thermal.c
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Diffstat (limited to 'drivers/thermal/rcar_thermal.c')
-rw-r--r--drivers/thermal/rcar_thermal.c490
1 files changed, 369 insertions, 121 deletions
diff --git a/drivers/thermal/rcar_thermal.c b/drivers/thermal/rcar_thermal.c
index 90db951725da..28f091994013 100644
--- a/drivers/thermal/rcar_thermal.c
+++ b/drivers/thermal/rcar_thermal.c
@@ -19,225 +19,473 @@
*/
#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/platform_device.h>
+#include <linux/reboot.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/thermal.h>
-#define THSCR 0x2c
-#define THSSR 0x30
+#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 CPTAP 0xf
+#define CPCTL (1 << 12)
/* THSSR */
#define CTEMP 0x3f
-
-struct rcar_thermal_priv {
+struct rcar_thermal_common {
void __iomem *base;
struct device *dev;
+ struct list_head head;
spinlock_t lock;
- u32 comp;
};
+struct rcar_thermal_priv {
+ void __iomem *base;
+ struct rcar_thermal_common *common;
+ struct thermal_zone_device *zone;
+ struct delayed_work work;
+ struct mutex lock;
+ struct list_head list;
+ int id;
+ int ctemp;
+};
+
+#define rcar_thermal_for_each_priv(pos, common) \
+ list_for_each_entry(pos, &common->head, list)
+
#define MCELSIUS(temp) ((temp) * 1000)
-#define rcar_zone_to_priv(zone) (zone->devdata)
+#define rcar_zone_to_priv(zone) ((zone)->devdata)
+#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)
+
+#ifdef DEBUG
+# define rcar_force_update_temp(priv) 1
+#else
+# define rcar_force_update_temp(priv) 0
+#endif
/*
* basic functions
*/
-static u32 rcar_thermal_read(struct rcar_thermal_priv *priv, u32 reg)
+#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)
{
- unsigned long flags;
- u32 ret;
-
- spin_lock_irqsave(&priv->lock, flags);
+ return ioread32(common->base + reg);
+}
- ret = ioread32(priv->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);
+}
- spin_unlock_irqrestore(&priv->lock, flags);
+#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;
- return ret;
+ val = ioread32(common->base + reg);
+ val &= ~mask;
+ val |= (data & mask);
+ iowrite32(val, common->base + reg);
}
-#if 0 /* no user at this point */
-static void rcar_thermal_write(struct rcar_thermal_priv *priv,
- u32 reg, u32 data)
+#define rcar_thermal_read(p, r) _rcar_thermal_read(p, REG_ ##r)
+static u32 _rcar_thermal_read(struct rcar_thermal_priv *priv, u32 reg)
{
- unsigned long flags;
-
- spin_lock_irqsave(&priv->lock, flags);
+ 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);
-
- spin_unlock_irqrestore(&priv->lock, flags);
}
-#endif
-static void rcar_thermal_bset(struct rcar_thermal_priv *priv, u32 reg,
- u32 mask, u32 data)
+#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)
{
- unsigned long flags;
u32 val;
- spin_lock_irqsave(&priv->lock, flags);
-
val = ioread32(priv->base + reg);
val &= ~mask;
val |= (data & mask);
iowrite32(val, priv->base + reg);
-
- spin_unlock_irqrestore(&priv->lock, flags);
}
/*
* zone device functions
*/
-static int rcar_thermal_get_temp(struct thermal_zone_device *zone,
- unsigned long *temp)
+static int rcar_thermal_update_temp(struct rcar_thermal_priv *priv)
{
- struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
- int val, min, max, tmp;
-
- tmp = -200; /* default */
- while (1) {
- if (priv->comp < 1 || priv->comp > 12) {
- dev_err(priv->dev,
- "THSSR invalid data (%d)\n", priv->comp);
- priv->comp = 4; /* for next thermal */
- return -EINVAL;
- }
+ struct device *dev = rcar_priv_to_dev(priv);
+ int i;
+ int ctemp, old, new;
- /*
- * THS comparator offset and the reference temperature
- *
- * Comparator | reference | Temperature field
- * offset | temperature | measurement
- * | (degrees C) | (degrees C)
- * -------------+---------------+-------------------
- * 1 | -45 | -45 to -30
- * 2 | -30 | -30 to -15
- * 3 | -15 | -15 to 0
- * 4 | 0 | 0 to +15
- * 5 | +15 | +15 to +30
- * 6 | +30 | +30 to +45
- * 7 | +45 | +45 to +60
- * 8 | +60 | +60 to +75
- * 9 | +75 | +75 to +90
- * 10 | +90 | +90 to +105
- * 11 | +105 | +105 to +120
- * 12 | +120 | +120 to +135
- */
+ mutex_lock(&priv->lock);
- /* calculate thermal limitation */
- min = (priv->comp * 15) - 60;
- max = min + 15;
+ /*
+ * TSC decides a value of CPTAP automatically,
+ * and this is the conditions which validate interrupt.
+ */
+ rcar_thermal_bset(priv, THSCR, CPCTL, CPCTL);
+ ctemp = 0;
+ 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
*/
- rcar_thermal_bset(priv, THSCR, CPTAP, priv->comp);
udelay(300);
- /* calculate current temperature */
- val = rcar_thermal_read(priv, THSSR) & CTEMP;
- val = (val * 5) - 65;
+ new = rcar_thermal_read(priv, THSSR) & CTEMP;
+ if (new == old) {
+ ctemp = new;
+ break;
+ }
+ old = new;
+ }
- dev_dbg(priv->dev, "comp/min/max/val = %d/%d/%d/%d\n",
- priv->comp, min, max, val);
+ if (!ctemp) {
+ dev_err(dev, "thermal sensor was broken\n");
+ return -EINVAL;
+ }
- /*
- * If val is same as min/max, then,
- * it should try again on next comparator.
- * But the val might be correct temperature.
- * Keep it on "tmp" and compare with next val.
- */
- if (tmp == val)
- break;
+ /*
+ * enable IRQ
+ */
+ if (rcar_has_irq_support(priv)) {
+ rcar_thermal_write(priv, FILONOFF, 0);
- if (val <= min) {
- tmp = min;
- priv->comp--; /* try again */
- } else if (val >= max) {
- tmp = max;
- priv->comp++; /* try again */
- } else {
- tmp = val;
- break;
- }
+ /* enable Rising/Falling edge interrupt */
+ rcar_thermal_write(priv, POSNEG, 0x1);
+ rcar_thermal_write(priv, INTCTRL, (((ctemp - 0) << 8) |
+ ((ctemp - 1) << 0)));
+ }
+
+ dev_dbg(dev, "thermal%d %d -> %d\n", priv->id, priv->ctemp, ctemp);
+
+ priv->ctemp = ctemp;
+
+ mutex_unlock(&priv->lock);
+
+ return 0;
+}
+
+static int rcar_thermal_get_temp(struct thermal_zone_device *zone,
+ unsigned long *temp)
+{
+ struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
+
+ if (!rcar_has_irq_support(priv) || rcar_force_update_temp(priv))
+ rcar_thermal_update_temp(priv);
+
+ mutex_lock(&priv->lock);
+ *temp = MCELSIUS((priv->ctemp * 5) - 65);
+ mutex_unlock(&priv->lock);
+
+ return 0;
+}
+
+static int rcar_thermal_get_trip_type(struct thermal_zone_device *zone,
+ int trip, enum thermal_trip_type *type)
+{
+ struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
+ struct device *dev = rcar_priv_to_dev(priv);
+
+ /* see rcar_thermal_get_temp() */
+ switch (trip) {
+ case 0: /* +90 <= temp */
+ *type = THERMAL_TRIP_CRITICAL;
+ break;
+ default:
+ dev_err(dev, "rcar driver trip error\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int rcar_thermal_get_trip_temp(struct thermal_zone_device *zone,
+ int trip, unsigned long *temp)
+{
+ struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
+ struct device *dev = rcar_priv_to_dev(priv);
+
+ /* see rcar_thermal_get_temp() */
+ switch (trip) {
+ case 0: /* +90 <= temp */
+ *temp = MCELSIUS(90);
+ break;
+ default:
+ dev_err(dev, "rcar driver trip error\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int rcar_thermal_notify(struct thermal_zone_device *zone,
+ int trip, enum thermal_trip_type type)
+{
+ struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
+ struct device *dev = rcar_priv_to_dev(priv);
+
+ switch (type) {
+ case THERMAL_TRIP_CRITICAL:
+ /* FIXME */
+ dev_warn(dev, "Thermal reached to critical temperature\n");
+ break;
+ default:
+ break;
}
- *temp = MCELSIUS(tmp);
return 0;
}
static struct thermal_zone_device_ops rcar_thermal_zone_ops = {
- .get_temp = rcar_thermal_get_temp,
+ .get_temp = rcar_thermal_get_temp,
+ .get_trip_type = rcar_thermal_get_trip_type,
+ .get_trip_temp = rcar_thermal_get_trip_temp,
+ .notify = rcar_thermal_notify,
};
/*
- * platform functions
+ * interrupt
*/
-static int rcar_thermal_probe(struct platform_device *pdev)
+#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 */
+
+ 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 thermal_zone_device *zone;
struct rcar_thermal_priv *priv;
- struct resource *res;
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!res) {
- dev_err(&pdev->dev, "Could not get platform resource\n");
- return -ENODEV;
+ priv = container_of(work, struct rcar_thermal_priv, work.work);
+
+ rcar_thermal_update_temp(priv);
+ rcar_thermal_irq_enable(priv);
+ thermal_zone_device_update(priv->zone);
+}
+
+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 & 0x3) {
+ dev_dbg(dev, "thermal%d %s%s\n",
+ priv->id,
+ (status & 0x2) ? "Rising " : "",
+ (status & 0x1) ? "Falling" : "");
}
- priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
- if (!priv) {
- dev_err(&pdev->dev, "Could not allocate priv\n");
- return -ENOMEM;
+ return status;
+}
+
+static irqreturn_t rcar_thermal_irq(int irq, void *data)
+{
+ struct rcar_thermal_common *common = data;
+ struct rcar_thermal_priv *priv;
+ unsigned long flags;
+ u32 status, mask;
+
+ spin_lock_irqsave(&common->lock, flags);
+
+ mask = rcar_thermal_common_read(common, INTMSK);
+ status = rcar_thermal_common_read(common, STR);
+ rcar_thermal_common_write(common, STR, 0x000F0F0F & mask);
+
+ spin_unlock_irqrestore(&common->lock, flags);
+
+ 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);
+ schedule_delayed_work(&priv->work,
+ msecs_to_jiffies(300));
+ }
}
- priv->comp = 4; /* basic setup */
- priv->dev = &pdev->dev;
- spin_lock_init(&priv->lock);
- priv->base = devm_ioremap_nocache(&pdev->dev,
- res->start, resource_size(res));
- if (!priv->base) {
- dev_err(&pdev->dev, "Unable to ioremap thermal register\n");
+ return IRQ_HANDLED;
+}
+
+/*
+ * platform functions
+ */
+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, *irq;
+ int mres = 0;
+ int i;
+ int idle = IDLE_INTERVAL;
+
+ common = devm_kzalloc(dev, sizeof(*common), GFP_KERNEL);
+ if (!common) {
+ dev_err(dev, "Could not allocate common\n");
return -ENOMEM;
}
- zone = thermal_zone_device_register("rcar_thermal", 0, 0, priv,
- &rcar_thermal_zone_ops, NULL, 0, 0);
- if (IS_ERR(zone)) {
- dev_err(&pdev->dev, "thermal zone device is NULL\n");
- return PTR_ERR(zone);
+ INIT_LIST_HEAD(&common->head);
+ spin_lock_init(&common->lock);
+ common->dev = dev;
+
+ irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+ if (irq) {
+ int ret;
+
+ /*
+ * platform has IRQ support.
+ * Then, drier use common register
+ */
+ res = platform_get_resource(pdev, IORESOURCE_MEM, mres++);
+ if (!res) {
+ dev_err(dev, "Could not get platform resource\n");
+ return -ENODEV;
+ }
+
+ ret = devm_request_irq(dev, irq->start, rcar_thermal_irq, 0,
+ dev_name(dev), common);
+ if (ret) {
+ dev_err(dev, "irq request failed\n ");
+ return ret;
+ }
+
+ /*
+ * rcar_has_irq_support() will be enabled
+ */
+ common->base = devm_request_and_ioremap(dev, res);
+ if (!common->base) {
+ dev_err(dev, "Unable to ioremap thermal register\n");
+ return -ENOMEM;
+ }
+
+ /* enable temperature comparation */
+ rcar_thermal_common_write(common, ENR, 0x00030303);
+
+ idle = 0; /* polling delaye is not needed */
}
- platform_set_drvdata(pdev, zone);
+ 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) {
+ dev_err(dev, "Could not allocate priv\n");
+ return -ENOMEM;
+ }
+
+ priv->base = devm_request_and_ioremap(dev, res);
+ if (!priv->base) {
+ dev_err(dev, "Unable to ioremap priv register\n");
+ return -ENOMEM;
+ }
- dev_info(&pdev->dev, "proved\n");
+ priv->common = common;
+ priv->id = i;
+ mutex_init(&priv->lock);
+ INIT_LIST_HEAD(&priv->list);
+ INIT_DELAYED_WORK(&priv->work, rcar_thermal_work);
+ rcar_thermal_update_temp(priv);
+
+ priv->zone = thermal_zone_device_register("rcar_thermal",
+ 1, 0, priv,
+ &rcar_thermal_zone_ops, NULL, 0,
+ idle);
+ if (IS_ERR(priv->zone)) {
+ dev_err(dev, "can't register thermal zone\n");
+ goto error_unregister;
+ }
+
+ list_move_tail(&priv->list, &common->head);
+
+ if (rcar_has_irq_support(priv))
+ rcar_thermal_irq_enable(priv);
+ }
+
+ platform_set_drvdata(pdev, common);
+
+ dev_info(dev, "%d sensor proved\n", i);
return 0;
+
+error_unregister:
+ rcar_thermal_for_each_priv(priv, common)
+ thermal_zone_device_unregister(priv->zone);
+
+ return -ENODEV;
}
static int rcar_thermal_remove(struct platform_device *pdev)
{
- struct thermal_zone_device *zone = platform_get_drvdata(pdev);
+ struct rcar_thermal_common *common = platform_get_drvdata(pdev);
+ struct rcar_thermal_priv *priv;
+
+ rcar_thermal_for_each_priv(priv, common)
+ thermal_zone_device_unregister(priv->zone);
- thermal_zone_device_unregister(zone);
platform_set_drvdata(pdev, NULL);
return 0;
}
+static const struct of_device_id rcar_thermal_dt_ids[] = {
+ { .compatible = "renesas,rcar-thermal", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, rcar_thermal_dt_ids);
+
static struct platform_driver rcar_thermal_driver = {
.driver = {
.name = "rcar_thermal",
+ .of_match_table = rcar_thermal_dt_ids,
},
.probe = rcar_thermal_probe,
.remove = rcar_thermal_remove,