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linux-next/drivers/thermal/rcar_thermal.c
Niklas Söderlund b03628b735 thermal: rcar_thermal: Clean up rcar_thermal_update_temp()
Moving the ctemp variable out of the private data structure made it
possible to clean up rcar_thermal_update_temp(). Initialize the local
ctemp to the error code to return if the reading fails and just return
it at the end of the function.

It's OK to change the datatype of old, new and ctemp to int as all
values are ANDed with CTEMP (0x3f) before being stored. While at it
change the datatype of the loop variable 'i' to to unsigned int.

Suggested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20200514152505.1927634-1-niklas.soderlund+renesas@ragnatech.se
2020-05-22 21:09:59 +02:00

651 lines
15 KiB
C

// 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_device.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_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)
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_of_get_temp(void *data, int *temp)
{
struct rcar_thermal_priv *priv = data;
return rcar_thermal_get_current_temp(priv, temp);
}
static int rcar_thermal_get_temp(struct thermal_zone_device *zone, int *temp)
{
struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
return rcar_thermal_get_current_temp(priv, temp);
}
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 const struct thermal_zone_of_device_ops rcar_thermal_zone_of_ops = {
.get_temp = rcar_thermal_of_get_temp,
};
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 */
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;
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);
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, *irq;
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++) {
irq = platform_get_resource(pdev, IORESOURCE_IRQ, i);
if (!irq)
continue;
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->start, 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_zone_of_sensor_register(
dev, i, priv,
&rcar_thermal_zone_of_ops);
else
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);
priv->zone = NULL;
goto error_unregister;
}
if (chip->use_of_thermal) {
/*
* thermal_zone doesn't enable hwmon as default,
* but, enable it here to keep compatible
*/
priv->zone->tzp->no_hwmon = false;
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>");