linux/drivers/thermal/rcar_thermal.c
Sascha Hauer 17e8351a77 thermal: consistently use int for temperatures
The thermal code uses int, long and unsigned long for temperatures
in different places.

Using an unsigned type limits the thermal framework to positive
temperatures without need. Also several drivers currently will report
temperatures near UINT_MAX for temperatures below 0°C. This will probably
immediately shut the machine down due to overtemperature if started below
0°C.

'long' is 64bit on several architectures. This is not needed since INT_MAX °mC
is above the melting point of all known materials.

Consistently use a plain 'int' for temperatures throughout the thermal code and
the drivers. This only changes the places in the drivers where the temperature
is passed around as pointer, when drivers internally use another type this is
not changed.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Reviewed-by: Lukasz Majewski <l.majewski@samsung.com>
Reviewed-by: Darren Hart <dvhart@linux.intel.com>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Peter Feuerer <peter@piie.net>
Cc: Punit Agrawal <punit.agrawal@arm.com>
Cc: Zhang Rui <rui.zhang@intel.com>
Cc: Eduardo Valentin <edubezval@gmail.com>
Cc: linux-pm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: Jean Delvare <jdelvare@suse.de>
Cc: Peter Feuerer <peter@piie.net>
Cc: Heiko Stuebner <heiko@sntech.de>
Cc: Lukasz Majewski <l.majewski@samsung.com>
Cc: Stephen Warren <swarren@wwwdotorg.org>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: linux-acpi@vger.kernel.org
Cc: platform-driver-x86@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-omap@vger.kernel.org
Cc: linux-samsung-soc@vger.kernel.org
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
Cc: Maxime Ripard <maxime.ripard@free-electrons.com>
Cc: Darren Hart <dvhart@infradead.org>
Cc: lm-sensors@lm-sensors.org
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
2015-08-03 23:15:50 +08:00

513 lines
12 KiB
C

/*
* R-Car THS/TSC thermal sensor driver
*
* Copyright (C) 2012 Renesas Solutions Corp.
* Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* 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.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#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/pm_runtime.h>
#include <linux/reboot.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/thermal.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_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;
u32 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_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
*/
#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 i;
u32 ctemp, old, new;
int ret = -EINVAL;
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);
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
*/
udelay(300);
new = rcar_thermal_read(priv, THSSR) & CTEMP;
if (new == old) {
ctemp = new;
break;
}
old = new;
}
if (!ctemp) {
dev_err(dev, "thermal sensor was broken\n");
goto err_out_unlock;
}
/*
* 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;
ret = 0;
err_out_unlock:
mutex_unlock(&priv->lock);
return ret;
}
static int rcar_thermal_get_temp(struct thermal_zone_device *zone, int *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, int *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;
}
return 0;
}
static struct thermal_zone_device_ops rcar_thermal_zone_ops = {
.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,
};
/*
* 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;
int cctemp, nctemp;
priv = container_of(work, struct rcar_thermal_priv, work.work);
rcar_thermal_get_temp(priv->zone, &cctemp);
rcar_thermal_update_temp(priv);
rcar_thermal_irq_enable(priv);
rcar_thermal_get_temp(priv->zone, &nctemp);
if (nctemp != cctemp)
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) {
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)
{
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 ret = -ENODEV;
int idle = IDLE_INTERVAL;
u32 enr_bits = 0;
common = devm_kzalloc(dev, sizeof(*common), GFP_KERNEL);
if (!common)
return -ENOMEM;
INIT_LIST_HEAD(&common->head);
spin_lock_init(&common->lock);
common->dev = dev;
pm_runtime_enable(dev);
pm_runtime_get_sync(dev);
irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (irq) {
/*
* 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))
return PTR_ERR(common->base);
idle = 0; /* polling delay is not needed */
}
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;
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");
ret = PTR_ERR(priv->zone);
goto error_unregister;
}
if (rcar_has_irq_support(priv))
rcar_thermal_irq_enable(priv);
list_move_tail(&priv->list, &common->head);
/* update ENR bits */
enr_bits |= 3 << (i * 8);
}
/* enable temperature comparation */
if (irq) {
ret = devm_request_irq(dev, irq->start, rcar_thermal_irq, 0,
dev_name(dev), common);
if (ret) {
dev_err(dev, "irq request failed\n ");
goto error_unregister;
}
rcar_thermal_common_write(common, ENR, enr_bits);
}
platform_set_drvdata(pdev, common);
dev_info(dev, "%d sensor probed\n", i);
return 0;
error_unregister:
rcar_thermal_for_each_priv(priv, common) {
if (rcar_has_irq_support(priv))
rcar_thermal_irq_disable(priv);
thermal_zone_device_unregister(priv->zone);
}
pm_runtime_put(dev);
pm_runtime_disable(dev);
return ret;
}
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) {
if (rcar_has_irq_support(priv))
rcar_thermal_irq_disable(priv);
thermal_zone_device_unregister(priv->zone);
}
pm_runtime_put(dev);
pm_runtime_disable(dev);
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,
};
module_platform_driver(rcar_thermal_driver);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("R-Car THS/TSC thermal sensor driver");
MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");