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linux/drivers/thermal/rcar_gen3_thermal.c
Niklas Söderlund c3131bd558 thermal: rcar_gen3_thermal: Read calibration from hardware 
In production hardware the calibration values used to convert register
values to temperatures can be read from hardware. While pre-production
hardware still depends on pseudo values hard-coded in the driver.

Add support for reading out calibration values from hardware if it's
fused. The presence of fused calibration is indicated in the THSCP
register.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Tested-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20211014103816.1939782-3-niklas.soderlund+renesas@ragnatech.se
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2021-10-15 09:15:52 +02:00

583 lines
15 KiB
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// SPDX-License-Identifier: GPL-2.0
/*
* R-Car Gen3 THS thermal sensor driver
* Based on rcar_thermal.c and work from Hien Dang and Khiem Nguyen.
*
* Copyright (C) 2016 Renesas Electronics Corporation.
* Copyright (C) 2016 Sang Engineering
*/
#include <linux/delay.h>
#include <linux/err.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/sys_soc.h>
#include <linux/thermal.h>
#include "thermal_core.h"
#include "thermal_hwmon.h"
/* Register offsets */
#define REG_GEN3_IRQSTR 0x04
#define REG_GEN3_IRQMSK 0x08
#define REG_GEN3_IRQCTL 0x0C
#define REG_GEN3_IRQEN 0x10
#define REG_GEN3_IRQTEMP1 0x14
#define REG_GEN3_IRQTEMP2 0x18
#define REG_GEN3_IRQTEMP3 0x1C
#define REG_GEN3_CTSR 0x20
#define REG_GEN3_THCTR 0x20
#define REG_GEN3_TEMP 0x28
#define REG_GEN3_THCODE1 0x50
#define REG_GEN3_THCODE2 0x54
#define REG_GEN3_THCODE3 0x58
#define REG_GEN3_PTAT1 0x5c
#define REG_GEN3_PTAT2 0x60
#define REG_GEN3_PTAT3 0x64
#define REG_GEN3_THSCP 0x68
/* IRQ{STR,MSK,EN} bits */
#define IRQ_TEMP1 BIT(0)
#define IRQ_TEMP2 BIT(1)
#define IRQ_TEMP3 BIT(2)
#define IRQ_TEMPD1 BIT(3)
#define IRQ_TEMPD2 BIT(4)
#define IRQ_TEMPD3 BIT(5)
/* CTSR bits */
#define CTSR_PONM BIT(8)
#define CTSR_AOUT BIT(7)
#define CTSR_THBGR BIT(5)
#define CTSR_VMEN BIT(4)
#define CTSR_VMST BIT(1)
#define CTSR_THSST BIT(0)
/* THCTR bits */
#define THCTR_PONM BIT(6)
#define THCTR_THSST BIT(0)
/* THSCP bits */
#define THSCP_COR_PARA_VLD (BIT(15) | BIT(14))
#define CTEMP_MASK 0xFFF
#define MCELSIUS(temp) ((temp) * 1000)
#define GEN3_FUSE_MASK 0xFFF
#define TSC_MAX_NUM 5
/* Structure for thermal temperature calculation */
struct equation_coefs {
int a1;
int b1;
int a2;
int b2;
};
struct rcar_gen3_thermal_tsc {
void __iomem *base;
struct thermal_zone_device *zone;
struct equation_coefs coef;
int tj_t;
int thcode[3];
};
struct rcar_gen3_thermal_priv {
struct rcar_gen3_thermal_tsc *tscs[TSC_MAX_NUM];
unsigned int num_tscs;
void (*thermal_init)(struct rcar_gen3_thermal_tsc *tsc);
int ptat[3];
};
static inline u32 rcar_gen3_thermal_read(struct rcar_gen3_thermal_tsc *tsc,
u32 reg)
{
return ioread32(tsc->base + reg);
}
static inline void rcar_gen3_thermal_write(struct rcar_gen3_thermal_tsc *tsc,
u32 reg, u32 data)
{
iowrite32(data, tsc->base + reg);
}
/*
* Linear approximation for temperature
*
* [reg] = [temp] * a + b => [temp] = ([reg] - b) / a
*
* The constants a and b are calculated using two triplets of int values PTAT
* and THCODE. PTAT and THCODE can either be read from hardware or use hard
* coded values from driver. The formula to calculate a and b are taken from
* BSP and sparsely documented and understood.
*
* Examining the linear formula and the formula used to calculate constants a
* and b while knowing that the span for PTAT and THCODE values are between
* 0x000 and 0xfff the largest integer possible is 0xfff * 0xfff == 0xffe001.
* Integer also needs to be signed so that leaves 7 bits for binary
* fixed point scaling.
*/
#define FIXPT_SHIFT 7
#define FIXPT_INT(_x) ((_x) << FIXPT_SHIFT)
#define INT_FIXPT(_x) ((_x) >> FIXPT_SHIFT)
#define FIXPT_DIV(_a, _b) DIV_ROUND_CLOSEST(((_a) << FIXPT_SHIFT), (_b))
#define FIXPT_TO_MCELSIUS(_x) ((_x) * 1000 >> FIXPT_SHIFT)
#define RCAR3_THERMAL_GRAN 500 /* mili Celsius */
/* no idea where these constants come from */
#define TJ_3 -41
static void rcar_gen3_thermal_calc_coefs(struct rcar_gen3_thermal_priv *priv,
struct rcar_gen3_thermal_tsc *tsc,
int ths_tj_1)
{
/* TODO: Find documentation and document constant calculation formula */
/*
* Division is not scaled in BSP and if scaled it might overflow
* the dividend (4095 * 4095 << 14 > INT_MAX) so keep it unscaled
*/
tsc->tj_t = (FIXPT_INT((priv->ptat[1] - priv->ptat[2]) * (ths_tj_1 - TJ_3))
/ (priv->ptat[0] - priv->ptat[2])) + FIXPT_INT(TJ_3);
tsc->coef.a1 = FIXPT_DIV(FIXPT_INT(tsc->thcode[1] - tsc->thcode[2]),
tsc->tj_t - FIXPT_INT(TJ_3));
tsc->coef.b1 = FIXPT_INT(tsc->thcode[2]) - tsc->coef.a1 * TJ_3;
tsc->coef.a2 = FIXPT_DIV(FIXPT_INT(tsc->thcode[1] - tsc->thcode[0]),
tsc->tj_t - FIXPT_INT(ths_tj_1));
tsc->coef.b2 = FIXPT_INT(tsc->thcode[0]) - tsc->coef.a2 * ths_tj_1;
}
static int rcar_gen3_thermal_round(int temp)
{
int result, round_offs;
round_offs = temp >= 0 ? RCAR3_THERMAL_GRAN / 2 :
-RCAR3_THERMAL_GRAN / 2;
result = (temp + round_offs) / RCAR3_THERMAL_GRAN;
return result * RCAR3_THERMAL_GRAN;
}
static int rcar_gen3_thermal_get_temp(void *devdata, int *temp)
{
struct rcar_gen3_thermal_tsc *tsc = devdata;
int mcelsius, val;
int reg;
/* Read register and convert to mili Celsius */
reg = rcar_gen3_thermal_read(tsc, REG_GEN3_TEMP) & CTEMP_MASK;
if (reg <= tsc->thcode[1])
val = FIXPT_DIV(FIXPT_INT(reg) - tsc->coef.b1,
tsc->coef.a1);
else
val = FIXPT_DIV(FIXPT_INT(reg) - tsc->coef.b2,
tsc->coef.a2);
mcelsius = FIXPT_TO_MCELSIUS(val);
/* Guaranteed operating range is -40C to 125C. */
/* Round value to device granularity setting */
*temp = rcar_gen3_thermal_round(mcelsius);
return 0;
}
static int rcar_gen3_thermal_mcelsius_to_temp(struct rcar_gen3_thermal_tsc *tsc,
int mcelsius)
{
int celsius, val;
celsius = DIV_ROUND_CLOSEST(mcelsius, 1000);
if (celsius <= INT_FIXPT(tsc->tj_t))
val = celsius * tsc->coef.a1 + tsc->coef.b1;
else
val = celsius * tsc->coef.a2 + tsc->coef.b2;
return INT_FIXPT(val);
}
static int rcar_gen3_thermal_set_trips(void *devdata, int low, int high)
{
struct rcar_gen3_thermal_tsc *tsc = devdata;
u32 irqmsk = 0;
if (low != -INT_MAX) {
irqmsk |= IRQ_TEMPD1;
rcar_gen3_thermal_write(tsc, REG_GEN3_IRQTEMP1,
rcar_gen3_thermal_mcelsius_to_temp(tsc, low));
}
if (high != INT_MAX) {
irqmsk |= IRQ_TEMP2;
rcar_gen3_thermal_write(tsc, REG_GEN3_IRQTEMP2,
rcar_gen3_thermal_mcelsius_to_temp(tsc, high));
}
rcar_gen3_thermal_write(tsc, REG_GEN3_IRQMSK, irqmsk);
return 0;
}
static struct thermal_zone_of_device_ops rcar_gen3_tz_of_ops = {
.get_temp = rcar_gen3_thermal_get_temp,
.set_trips = rcar_gen3_thermal_set_trips,
};
static irqreturn_t rcar_gen3_thermal_irq(int irq, void *data)
{
struct rcar_gen3_thermal_priv *priv = data;
unsigned int i;
u32 status;
for (i = 0; i < priv->num_tscs; i++) {
status = rcar_gen3_thermal_read(priv->tscs[i], REG_GEN3_IRQSTR);
rcar_gen3_thermal_write(priv->tscs[i], REG_GEN3_IRQSTR, 0);
if (status)
thermal_zone_device_update(priv->tscs[i]->zone,
THERMAL_EVENT_UNSPECIFIED);
}
return IRQ_HANDLED;
}
static const struct soc_device_attribute r8a7795es1[] = {
{ .soc_id = "r8a7795", .revision = "ES1.*" },
{ /* sentinel */ }
};
static bool rcar_gen3_thermal_read_fuses(struct rcar_gen3_thermal_priv *priv)
{
unsigned int i;
u32 thscp;
/* If fuses are not set, fallback to pseudo values. */
thscp = rcar_gen3_thermal_read(priv->tscs[0], REG_GEN3_THSCP);
if ((thscp & THSCP_COR_PARA_VLD) != THSCP_COR_PARA_VLD) {
/* Default THCODE values in case FUSEs are not set. */
static const int thcodes[TSC_MAX_NUM][3] = {
{ 3397, 2800, 2221 },
{ 3393, 2795, 2216 },
{ 3389, 2805, 2237 },
{ 3415, 2694, 2195 },
{ 3356, 2724, 2244 },
};
priv->ptat[0] = 2631;
priv->ptat[1] = 1509;
priv->ptat[2] = 435;
for (i = 0; i < priv->num_tscs; i++) {
struct rcar_gen3_thermal_tsc *tsc = priv->tscs[i];
tsc->thcode[0] = thcodes[i][0];
tsc->thcode[1] = thcodes[i][1];
tsc->thcode[2] = thcodes[i][2];
}
return false;
}
/*
* Set the pseudo calibration points with fused values.
* PTAT is shared between all TSCs but only fused for the first
* TSC while THCODEs are fused for each TSC.
*/
priv->ptat[0] = rcar_gen3_thermal_read(priv->tscs[0], REG_GEN3_PTAT1) &
GEN3_FUSE_MASK;
priv->ptat[1] = rcar_gen3_thermal_read(priv->tscs[0], REG_GEN3_PTAT2) &
GEN3_FUSE_MASK;
priv->ptat[2] = rcar_gen3_thermal_read(priv->tscs[0], REG_GEN3_PTAT3) &
GEN3_FUSE_MASK;
for (i = 0; i < priv->num_tscs; i++) {
struct rcar_gen3_thermal_tsc *tsc = priv->tscs[i];
tsc->thcode[0] = rcar_gen3_thermal_read(tsc, REG_GEN3_THCODE1) &
GEN3_FUSE_MASK;
tsc->thcode[1] = rcar_gen3_thermal_read(tsc, REG_GEN3_THCODE2) &
GEN3_FUSE_MASK;
tsc->thcode[2] = rcar_gen3_thermal_read(tsc, REG_GEN3_THCODE3) &
GEN3_FUSE_MASK;
}
return true;
}
static void rcar_gen3_thermal_init_r8a7795es1(struct rcar_gen3_thermal_tsc *tsc)
{
rcar_gen3_thermal_write(tsc, REG_GEN3_CTSR, CTSR_THBGR);
rcar_gen3_thermal_write(tsc, REG_GEN3_CTSR, 0x0);
usleep_range(1000, 2000);
rcar_gen3_thermal_write(tsc, REG_GEN3_CTSR, CTSR_PONM);
rcar_gen3_thermal_write(tsc, REG_GEN3_IRQCTL, 0x3F);
rcar_gen3_thermal_write(tsc, REG_GEN3_IRQMSK, 0);
if (tsc->zone->ops->set_trips)
rcar_gen3_thermal_write(tsc, REG_GEN3_IRQEN,
IRQ_TEMPD1 | IRQ_TEMP2);
rcar_gen3_thermal_write(tsc, REG_GEN3_CTSR,
CTSR_PONM | CTSR_AOUT | CTSR_THBGR | CTSR_VMEN);
usleep_range(100, 200);
rcar_gen3_thermal_write(tsc, REG_GEN3_CTSR,
CTSR_PONM | CTSR_AOUT | CTSR_THBGR | CTSR_VMEN |
CTSR_VMST | CTSR_THSST);
usleep_range(1000, 2000);
}
static void rcar_gen3_thermal_init(struct rcar_gen3_thermal_tsc *tsc)
{
u32 reg_val;
reg_val = rcar_gen3_thermal_read(tsc, REG_GEN3_THCTR);
reg_val &= ~THCTR_PONM;
rcar_gen3_thermal_write(tsc, REG_GEN3_THCTR, reg_val);
usleep_range(1000, 2000);
rcar_gen3_thermal_write(tsc, REG_GEN3_IRQCTL, 0);
rcar_gen3_thermal_write(tsc, REG_GEN3_IRQMSK, 0);
if (tsc->zone->ops->set_trips)
rcar_gen3_thermal_write(tsc, REG_GEN3_IRQEN,
IRQ_TEMPD1 | IRQ_TEMP2);
reg_val = rcar_gen3_thermal_read(tsc, REG_GEN3_THCTR);
reg_val |= THCTR_THSST;
rcar_gen3_thermal_write(tsc, REG_GEN3_THCTR, reg_val);
usleep_range(1000, 2000);
}
static const int rcar_gen3_ths_tj_1 = 126;
static const int rcar_gen3_ths_tj_1_m3_w = 116;
static const struct of_device_id rcar_gen3_thermal_dt_ids[] = {
{
.compatible = "renesas,r8a774a1-thermal",
.data = &rcar_gen3_ths_tj_1_m3_w,
},
{
.compatible = "renesas,r8a774b1-thermal",
.data = &rcar_gen3_ths_tj_1,
},
{
.compatible = "renesas,r8a774e1-thermal",
.data = &rcar_gen3_ths_tj_1,
},
{
.compatible = "renesas,r8a7795-thermal",
.data = &rcar_gen3_ths_tj_1,
},
{
.compatible = "renesas,r8a7796-thermal",
.data = &rcar_gen3_ths_tj_1_m3_w,
},
{
.compatible = "renesas,r8a77961-thermal",
.data = &rcar_gen3_ths_tj_1_m3_w,
},
{
.compatible = "renesas,r8a77965-thermal",
.data = &rcar_gen3_ths_tj_1,
},
{
.compatible = "renesas,r8a77980-thermal",
.data = &rcar_gen3_ths_tj_1,
},
{
.compatible = "renesas,r8a779a0-thermal",
.data = &rcar_gen3_ths_tj_1,
},
{},
};
MODULE_DEVICE_TABLE(of, rcar_gen3_thermal_dt_ids);
static int rcar_gen3_thermal_remove(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
pm_runtime_put(dev);
pm_runtime_disable(dev);
return 0;
}
static void rcar_gen3_hwmon_action(void *data)
{
struct thermal_zone_device *zone = data;
thermal_remove_hwmon_sysfs(zone);
}
static int rcar_gen3_thermal_request_irqs(struct rcar_gen3_thermal_priv *priv,
struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
unsigned int i;
char *irqname;
int ret, irq;
for (i = 0; i < 2; i++) {
irq = platform_get_irq_optional(pdev, i);
if (irq < 0)
return irq;
irqname = devm_kasprintf(dev, GFP_KERNEL, "%s:ch%d",
dev_name(dev), i);
if (!irqname)
return -ENOMEM;
ret = devm_request_threaded_irq(dev, irq, NULL,
rcar_gen3_thermal_irq,
IRQF_ONESHOT, irqname, priv);
if (ret)
return ret;
}
return 0;
}
static int rcar_gen3_thermal_probe(struct platform_device *pdev)
{
struct rcar_gen3_thermal_priv *priv;
struct device *dev = &pdev->dev;
const int *ths_tj_1 = of_device_get_match_data(dev);
struct resource *res;
struct thermal_zone_device *zone;
unsigned int i;
int ret;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->thermal_init = rcar_gen3_thermal_init;
if (soc_device_match(r8a7795es1))
priv->thermal_init = rcar_gen3_thermal_init_r8a7795es1;
platform_set_drvdata(pdev, priv);
if (rcar_gen3_thermal_request_irqs(priv, pdev))
rcar_gen3_tz_of_ops.set_trips = NULL;
pm_runtime_enable(dev);
pm_runtime_get_sync(dev);
for (i = 0; i < TSC_MAX_NUM; i++) {
struct rcar_gen3_thermal_tsc *tsc;
res = platform_get_resource(pdev, IORESOURCE_MEM, i);
if (!res)
break;
tsc = devm_kzalloc(dev, sizeof(*tsc), GFP_KERNEL);
if (!tsc) {
ret = -ENOMEM;
goto error_unregister;
}
tsc->base = devm_ioremap_resource(dev, res);
if (IS_ERR(tsc->base)) {
ret = PTR_ERR(tsc->base);
goto error_unregister;
}
priv->tscs[i] = tsc;
}
priv->num_tscs = i;
if (!rcar_gen3_thermal_read_fuses(priv))
dev_info(dev, "No calibration values fused, fallback to driver values\n");
for (i = 0; i < priv->num_tscs; i++) {
struct rcar_gen3_thermal_tsc *tsc = priv->tscs[i];
zone = devm_thermal_zone_of_sensor_register(dev, i, tsc,
&rcar_gen3_tz_of_ops);
if (IS_ERR(zone)) {
dev_err(dev, "Can't register thermal zone\n");
ret = PTR_ERR(zone);
goto error_unregister;
}
tsc->zone = zone;
priv->thermal_init(tsc);
rcar_gen3_thermal_calc_coefs(priv, tsc, *ths_tj_1);
tsc->zone->tzp->no_hwmon = false;
ret = thermal_add_hwmon_sysfs(tsc->zone);
if (ret)
goto error_unregister;
ret = devm_add_action_or_reset(dev, rcar_gen3_hwmon_action, zone);
if (ret)
goto error_unregister;
ret = of_thermal_get_ntrips(tsc->zone);
if (ret < 0)
goto error_unregister;
dev_info(dev, "TSC%u: Loaded %d trip points\n", i, ret);
}
if (!priv->num_tscs) {
ret = -ENODEV;
goto error_unregister;
}
return 0;
error_unregister:
rcar_gen3_thermal_remove(pdev);
return ret;
}
static int __maybe_unused rcar_gen3_thermal_resume(struct device *dev)
{
struct rcar_gen3_thermal_priv *priv = dev_get_drvdata(dev);
unsigned int i;
for (i = 0; i < priv->num_tscs; i++) {
struct rcar_gen3_thermal_tsc *tsc = priv->tscs[i];
struct thermal_zone_device *zone = tsc->zone;
priv->thermal_init(tsc);
if (zone->ops->set_trips)
rcar_gen3_thermal_set_trips(tsc, zone->prev_low_trip,
zone->prev_high_trip);
}
return 0;
}
static SIMPLE_DEV_PM_OPS(rcar_gen3_thermal_pm_ops, NULL,
rcar_gen3_thermal_resume);
static struct platform_driver rcar_gen3_thermal_driver = {
.driver = {
.name = "rcar_gen3_thermal",
.pm = &rcar_gen3_thermal_pm_ops,
.of_match_table = rcar_gen3_thermal_dt_ids,
},
.probe = rcar_gen3_thermal_probe,
.remove = rcar_gen3_thermal_remove,
};
module_platform_driver(rcar_gen3_thermal_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("R-Car Gen3 THS thermal sensor driver");
MODULE_AUTHOR("Wolfram Sang <wsa+renesas@sang-engineering.com>");
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