thermal: rcar: add interrupt support
This patch adds interrupt support for R-Car thermal driver.
New generation R-Car thermal sensor interrupt controller was
different from old generation.
This patch supports new generation sensor only,
since the old generation interrupt controller had never been used before,
and will never be used in the future.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
diff --git a/drivers/thermal/rcar_thermal.c b/drivers/thermal/rcar_thermal.c
index cf6aa98..80aae3c 100644
--- a/drivers/thermal/rcar_thermal.c
+++ b/drivers/thermal/rcar_thermal.c
@@ -19,6 +19,8 @@
*/
#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>
@@ -29,8 +31,15 @@
#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)
@@ -42,14 +51,18 @@
void __iomem *base;
struct device *dev;
struct list_head head;
+ spinlock_t lock;
};
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) \
@@ -59,11 +72,17 @@
#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
*/
-#if 0
#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,
@@ -92,7 +111,6 @@
val |= (data & mask);
iowrite32(val, common->base + reg);
}
-#endif
#define rcar_thermal_read(p, r) _rcar_thermal_read(p, REG_ ##r)
static u32 _rcar_thermal_read(struct rcar_thermal_priv *priv, u32 reg)
@@ -100,14 +118,12 @@
return ioread32(priv->base + reg);
}
-#if 0 /* no user at this point */
#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);
}
-#endif
#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,
@@ -124,10 +140,8 @@
/*
* 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);
struct device *dev = rcar_priv_to_dev(priv);
int i;
int ctemp, old, new;
@@ -163,8 +177,37 @@
return -EINVAL;
}
- *temp = MCELSIUS((ctemp * 5) - 65);
+ /*
+ * enable IRQ
+ */
+ if (rcar_has_irq_support(priv)) {
+ 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)));
+ }
+
+ 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;
@@ -235,6 +278,82 @@
};
/*
+ * 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 */
+
+ 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;
+
+ 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" : "");
+ }
+
+ 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));
+ }
+ }
+
+ return IRQ_HANDLED;
+}
+
+/*
* platform functions
*/
static int rcar_thermal_probe(struct platform_device *pdev)
@@ -245,6 +364,7 @@
struct resource *res, *irq;
int mres = 0;
int i;
+ int idle = IDLE_INTERVAL;
common = devm_kzalloc(dev, sizeof(*common), GFP_KERNEL);
if (!common) {
@@ -253,10 +373,13 @@
}
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
@@ -267,6 +390,13 @@
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
*/
@@ -275,6 +405,11 @@
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 */
}
for (i = 0;; i++) {
@@ -295,19 +430,25 @@
}
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_INTERVAL);
+ 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);