2018-08-21 02:42:35 +08:00
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// SPDX-License-Identifier: GPL-2.0
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2016-12-22 18:38:21 +08:00
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/*
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* R-Car Gen3 THS thermal sensor driver
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* Based on rcar_thermal.c and work from Hien Dang and Khiem Nguyen.
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*
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* Copyright (C) 2016 Renesas Electronics Corporation.
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* Copyright (C) 2016 Sang Engineering
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*/
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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2017-10-17 19:36:13 +08:00
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#include <linux/sys_soc.h>
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2016-12-22 18:38:21 +08:00
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#include <linux/thermal.h>
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2017-03-30 02:43:54 +08:00
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#include "thermal_core.h"
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2019-02-12 03:56:20 +08:00
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#include "thermal_hwmon.h"
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2017-03-30 02:43:54 +08:00
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2016-12-22 18:38:21 +08:00
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/* Register offsets */
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#define REG_GEN3_IRQSTR 0x04
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#define REG_GEN3_IRQMSK 0x08
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#define REG_GEN3_IRQCTL 0x0C
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#define REG_GEN3_IRQEN 0x10
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#define REG_GEN3_IRQTEMP1 0x14
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#define REG_GEN3_IRQTEMP2 0x18
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#define REG_GEN3_IRQTEMP3 0x1C
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#define REG_GEN3_CTSR 0x20
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#define REG_GEN3_THCTR 0x20
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#define REG_GEN3_TEMP 0x28
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#define REG_GEN3_THCODE1 0x50
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#define REG_GEN3_THCODE2 0x54
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#define REG_GEN3_THCODE3 0x58
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2017-03-30 02:43:54 +08:00
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/* IRQ{STR,MSK,EN} bits */
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#define IRQ_TEMP1 BIT(0)
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#define IRQ_TEMP2 BIT(1)
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#define IRQ_TEMP3 BIT(2)
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#define IRQ_TEMPD1 BIT(3)
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#define IRQ_TEMPD2 BIT(4)
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#define IRQ_TEMPD3 BIT(5)
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2016-12-22 18:38:21 +08:00
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/* CTSR bits */
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#define CTSR_PONM BIT(8)
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#define CTSR_AOUT BIT(7)
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#define CTSR_THBGR BIT(5)
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#define CTSR_VMEN BIT(4)
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#define CTSR_VMST BIT(1)
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#define CTSR_THSST BIT(0)
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/* THCTR bits */
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#define THCTR_PONM BIT(6)
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#define THCTR_THSST BIT(0)
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#define CTEMP_MASK 0xFFF
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#define MCELSIUS(temp) ((temp) * 1000)
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#define GEN3_FUSE_MASK 0xFFF
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#define TSC_MAX_NUM 3
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/* Structure for thermal temperature calculation */
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struct equation_coefs {
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int a1;
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int b1;
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int a2;
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int b2;
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};
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struct rcar_gen3_thermal_tsc {
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void __iomem *base;
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struct thermal_zone_device *zone;
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struct equation_coefs coef;
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2017-03-30 02:43:56 +08:00
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int low;
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int high;
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2016-12-22 18:38:21 +08:00
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};
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struct rcar_gen3_thermal_priv {
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struct rcar_gen3_thermal_tsc *tscs[TSC_MAX_NUM];
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2017-03-30 02:43:53 +08:00
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unsigned int num_tscs;
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2016-12-22 18:38:21 +08:00
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void (*thermal_init)(struct rcar_gen3_thermal_tsc *tsc);
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};
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static inline u32 rcar_gen3_thermal_read(struct rcar_gen3_thermal_tsc *tsc,
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u32 reg)
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{
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return ioread32(tsc->base + reg);
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}
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static inline void rcar_gen3_thermal_write(struct rcar_gen3_thermal_tsc *tsc,
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u32 reg, u32 data)
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{
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iowrite32(data, tsc->base + reg);
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}
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/*
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* Linear approximation for temperature
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*
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* [reg] = [temp] * a + b => [temp] = ([reg] - b) / a
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*
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* The constants a and b are calculated using two triplets of int values PTAT
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* and THCODE. PTAT and THCODE can either be read from hardware or use hard
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* coded values from driver. The formula to calculate a and b are taken from
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* BSP and sparsely documented and understood.
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*
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* Examining the linear formula and the formula used to calculate constants a
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* and b while knowing that the span for PTAT and THCODE values are between
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* 0x000 and 0xfff the largest integer possible is 0xfff * 0xfff == 0xffe001.
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* Integer also needs to be signed so that leaves 7 bits for binary
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* fixed point scaling.
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*/
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#define FIXPT_SHIFT 7
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#define FIXPT_INT(_x) ((_x) << FIXPT_SHIFT)
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2017-03-30 02:43:54 +08:00
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#define INT_FIXPT(_x) ((_x) >> FIXPT_SHIFT)
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2016-12-22 18:38:21 +08:00
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#define FIXPT_DIV(_a, _b) DIV_ROUND_CLOSEST(((_a) << FIXPT_SHIFT), (_b))
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#define FIXPT_TO_MCELSIUS(_x) ((_x) * 1000 >> FIXPT_SHIFT)
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#define RCAR3_THERMAL_GRAN 500 /* mili Celsius */
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/* no idea where these constants come from */
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2018-04-18 04:57:46 +08:00
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#define TJ_1 116
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2016-12-22 18:38:21 +08:00
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#define TJ_3 -41
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static void rcar_gen3_thermal_calc_coefs(struct equation_coefs *coef,
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int *ptat, int *thcode)
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{
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int tj_2;
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/* TODO: Find documentation and document constant calculation formula */
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/*
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* Division is not scaled in BSP and if scaled it might overflow
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* the dividend (4095 * 4095 << 14 > INT_MAX) so keep it unscaled
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*/
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2018-04-18 04:57:46 +08:00
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tj_2 = (FIXPT_INT((ptat[1] - ptat[2]) * 157)
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2016-12-22 18:38:21 +08:00
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/ (ptat[0] - ptat[2])) - FIXPT_INT(41);
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coef->a1 = FIXPT_DIV(FIXPT_INT(thcode[1] - thcode[2]),
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tj_2 - FIXPT_INT(TJ_3));
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coef->b1 = FIXPT_INT(thcode[2]) - coef->a1 * TJ_3;
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coef->a2 = FIXPT_DIV(FIXPT_INT(thcode[1] - thcode[0]),
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tj_2 - FIXPT_INT(TJ_1));
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coef->b2 = FIXPT_INT(thcode[0]) - coef->a2 * TJ_1;
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}
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static int rcar_gen3_thermal_round(int temp)
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{
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int result, round_offs;
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round_offs = temp >= 0 ? RCAR3_THERMAL_GRAN / 2 :
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-RCAR3_THERMAL_GRAN / 2;
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result = (temp + round_offs) / RCAR3_THERMAL_GRAN;
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return result * RCAR3_THERMAL_GRAN;
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}
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static int rcar_gen3_thermal_get_temp(void *devdata, int *temp)
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{
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struct rcar_gen3_thermal_tsc *tsc = devdata;
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int mcelsius, val1, val2;
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u32 reg;
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/* Read register and convert to mili Celsius */
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reg = rcar_gen3_thermal_read(tsc, REG_GEN3_TEMP) & CTEMP_MASK;
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val1 = FIXPT_DIV(FIXPT_INT(reg) - tsc->coef.b1, tsc->coef.a1);
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val2 = FIXPT_DIV(FIXPT_INT(reg) - tsc->coef.b2, tsc->coef.a2);
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mcelsius = FIXPT_TO_MCELSIUS((val1 + val2) / 2);
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/* Make sure we are inside specifications */
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if ((mcelsius < MCELSIUS(-40)) || (mcelsius > MCELSIUS(125)))
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return -EIO;
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/* Round value to device granularity setting */
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*temp = rcar_gen3_thermal_round(mcelsius);
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return 0;
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}
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2017-03-30 02:43:54 +08:00
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static int rcar_gen3_thermal_mcelsius_to_temp(struct rcar_gen3_thermal_tsc *tsc,
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int mcelsius)
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{
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int celsius, val1, val2;
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celsius = DIV_ROUND_CLOSEST(mcelsius, 1000);
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val1 = celsius * tsc->coef.a1 + tsc->coef.b1;
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val2 = celsius * tsc->coef.a2 + tsc->coef.b2;
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return INT_FIXPT((val1 + val2) / 2);
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}
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static int rcar_gen3_thermal_set_trips(void *devdata, int low, int high)
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{
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struct rcar_gen3_thermal_tsc *tsc = devdata;
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2018-04-18 04:57:47 +08:00
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low = clamp_val(low, -40000, 120000);
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high = clamp_val(high, -40000, 120000);
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2017-03-30 02:43:54 +08:00
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rcar_gen3_thermal_write(tsc, REG_GEN3_IRQTEMP1,
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rcar_gen3_thermal_mcelsius_to_temp(tsc, low));
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rcar_gen3_thermal_write(tsc, REG_GEN3_IRQTEMP2,
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rcar_gen3_thermal_mcelsius_to_temp(tsc, high));
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2017-03-30 02:43:56 +08:00
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tsc->low = low;
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tsc->high = high;
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2017-03-30 02:43:54 +08:00
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return 0;
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}
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2017-08-08 23:08:57 +08:00
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static const struct thermal_zone_of_device_ops rcar_gen3_tz_of_ops = {
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2016-12-22 18:38:21 +08:00
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.get_temp = rcar_gen3_thermal_get_temp,
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2017-03-30 02:43:54 +08:00
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.set_trips = rcar_gen3_thermal_set_trips,
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2016-12-22 18:38:21 +08:00
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};
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2017-03-30 02:43:54 +08:00
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static void rcar_thermal_irq_set(struct rcar_gen3_thermal_priv *priv, bool on)
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{
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unsigned int i;
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u32 val = on ? IRQ_TEMPD1 | IRQ_TEMP2 : 0;
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for (i = 0; i < priv->num_tscs; i++)
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rcar_gen3_thermal_write(priv->tscs[i], REG_GEN3_IRQMSK, val);
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}
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static irqreturn_t rcar_gen3_thermal_irq(int irq, void *data)
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{
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struct rcar_gen3_thermal_priv *priv = data;
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u32 status;
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2019-04-24 13:11:44 +08:00
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int i;
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2017-03-30 02:43:54 +08:00
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for (i = 0; i < priv->num_tscs; i++) {
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status = rcar_gen3_thermal_read(priv->tscs[i], REG_GEN3_IRQSTR);
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rcar_gen3_thermal_write(priv->tscs[i], REG_GEN3_IRQSTR, 0);
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if (status)
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2019-04-24 13:11:44 +08:00
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thermal_zone_device_update(priv->tscs[i]->zone,
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THERMAL_EVENT_UNSPECIFIED);
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2017-03-30 02:43:54 +08:00
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}
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return IRQ_HANDLED;
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}
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2017-10-17 19:36:13 +08:00
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static const struct soc_device_attribute r8a7795es1[] = {
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{ .soc_id = "r8a7795", .revision = "ES1.*" },
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{ /* sentinel */ }
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};
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static void rcar_gen3_thermal_init_r8a7795es1(struct rcar_gen3_thermal_tsc *tsc)
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2016-12-22 18:38:21 +08:00
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{
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rcar_gen3_thermal_write(tsc, REG_GEN3_CTSR, CTSR_THBGR);
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rcar_gen3_thermal_write(tsc, REG_GEN3_CTSR, 0x0);
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usleep_range(1000, 2000);
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rcar_gen3_thermal_write(tsc, REG_GEN3_CTSR, CTSR_PONM);
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2017-03-30 02:43:54 +08:00
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2016-12-22 18:38:21 +08:00
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rcar_gen3_thermal_write(tsc, REG_GEN3_IRQCTL, 0x3F);
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2017-03-30 02:43:54 +08:00
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rcar_gen3_thermal_write(tsc, REG_GEN3_IRQMSK, 0);
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rcar_gen3_thermal_write(tsc, REG_GEN3_IRQEN, IRQ_TEMPD1 | IRQ_TEMP2);
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2016-12-22 18:38:21 +08:00
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rcar_gen3_thermal_write(tsc, REG_GEN3_CTSR,
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CTSR_PONM | CTSR_AOUT | CTSR_THBGR | CTSR_VMEN);
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usleep_range(100, 200);
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rcar_gen3_thermal_write(tsc, REG_GEN3_CTSR,
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CTSR_PONM | CTSR_AOUT | CTSR_THBGR | CTSR_VMEN |
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CTSR_VMST | CTSR_THSST);
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usleep_range(1000, 2000);
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}
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2017-10-17 19:36:13 +08:00
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static void rcar_gen3_thermal_init(struct rcar_gen3_thermal_tsc *tsc)
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2016-12-22 18:38:21 +08:00
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{
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u32 reg_val;
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reg_val = rcar_gen3_thermal_read(tsc, REG_GEN3_THCTR);
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reg_val &= ~THCTR_PONM;
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rcar_gen3_thermal_write(tsc, REG_GEN3_THCTR, reg_val);
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usleep_range(1000, 2000);
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2019-03-27 17:03:18 +08:00
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rcar_gen3_thermal_write(tsc, REG_GEN3_IRQCTL, 0);
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2017-03-30 02:43:54 +08:00
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rcar_gen3_thermal_write(tsc, REG_GEN3_IRQMSK, 0);
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rcar_gen3_thermal_write(tsc, REG_GEN3_IRQEN, IRQ_TEMPD1 | IRQ_TEMP2);
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2016-12-22 18:38:21 +08:00
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reg_val = rcar_gen3_thermal_read(tsc, REG_GEN3_THCTR);
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reg_val |= THCTR_THSST;
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rcar_gen3_thermal_write(tsc, REG_GEN3_THCTR, reg_val);
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2017-03-30 02:43:50 +08:00
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usleep_range(1000, 2000);
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2016-12-22 18:38:21 +08:00
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}
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static const struct of_device_id rcar_gen3_thermal_dt_ids[] = {
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2018-08-17 22:53:03 +08:00
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{ .compatible = "renesas,r8a774a1-thermal", },
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2017-10-17 19:36:13 +08:00
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{ .compatible = "renesas,r8a7795-thermal", },
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{ .compatible = "renesas,r8a7796-thermal", },
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2018-04-27 03:42:02 +08:00
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{ .compatible = "renesas,r8a77965-thermal", },
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2018-10-10 03:11:51 +08:00
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{ .compatible = "renesas,r8a77980-thermal", },
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2016-12-22 18:38:21 +08:00
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{},
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};
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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;
|
|
|
|
}
|
|
|
|
|
2019-02-12 03:56:20 +08:00
|
|
|
static void rcar_gen3_hwmon_action(void *data)
|
|
|
|
{
|
|
|
|
struct thermal_zone_device *zone = data;
|
|
|
|
|
|
|
|
thermal_remove_hwmon_sysfs(zone);
|
|
|
|
}
|
|
|
|
|
2016-12-22 18:38:21 +08:00
|
|
|
static int rcar_gen3_thermal_probe(struct platform_device *pdev)
|
|
|
|
{
|
|
|
|
struct rcar_gen3_thermal_priv *priv;
|
|
|
|
struct device *dev = &pdev->dev;
|
|
|
|
struct resource *res;
|
|
|
|
struct thermal_zone_device *zone;
|
2017-03-30 02:43:54 +08:00
|
|
|
int ret, irq, i;
|
|
|
|
char *irqname;
|
2016-12-22 18:38:21 +08:00
|
|
|
|
|
|
|
/* default values if FUSEs are missing */
|
|
|
|
/* TODO: Read values from hardware on supported platforms */
|
2018-04-18 04:57:46 +08:00
|
|
|
int ptat[3] = { 2631, 1509, 435 };
|
2016-12-22 18:38:21 +08:00
|
|
|
int thcode[TSC_MAX_NUM][3] = {
|
2018-04-18 04:57:46 +08:00
|
|
|
{ 3397, 2800, 2221 },
|
|
|
|
{ 3393, 2795, 2216 },
|
|
|
|
{ 3389, 2805, 2237 },
|
2016-12-22 18:38:21 +08:00
|
|
|
};
|
|
|
|
|
|
|
|
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
|
|
|
|
if (!priv)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
2017-10-17 19:36:13 +08:00
|
|
|
priv->thermal_init = rcar_gen3_thermal_init;
|
|
|
|
if (soc_device_match(r8a7795es1))
|
|
|
|
priv->thermal_init = rcar_gen3_thermal_init_r8a7795es1;
|
2017-03-30 02:43:55 +08:00
|
|
|
|
2016-12-22 18:38:21 +08:00
|
|
|
platform_set_drvdata(pdev, priv);
|
|
|
|
|
2017-03-30 02:43:54 +08:00
|
|
|
/*
|
|
|
|
* Request 2 (of the 3 possible) IRQs, the driver only needs to
|
|
|
|
* to trigger on the low and high trip points of the current
|
|
|
|
* temp window at this point.
|
|
|
|
*/
|
|
|
|
for (i = 0; i < 2; i++) {
|
|
|
|
irq = platform_get_irq(pdev, i);
|
|
|
|
if (irq < 0)
|
|
|
|
return irq;
|
|
|
|
|
|
|
|
irqname = devm_kasprintf(dev, GFP_KERNEL, "%s:ch%d",
|
|
|
|
dev_name(dev), i);
|
|
|
|
if (!irqname)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
2019-04-24 13:11:44 +08:00
|
|
|
ret = devm_request_threaded_irq(dev, irq, NULL,
|
|
|
|
rcar_gen3_thermal_irq,
|
|
|
|
IRQF_ONESHOT, irqname, priv);
|
2017-03-30 02:43:54 +08:00
|
|
|
if (ret)
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2016-12-22 18:38:21 +08:00
|
|
|
pm_runtime_enable(dev);
|
|
|
|
pm_runtime_get_sync(dev);
|
|
|
|
|
|
|
|
for (i = 0; i < TSC_MAX_NUM; i++) {
|
|
|
|
struct rcar_gen3_thermal_tsc *tsc;
|
|
|
|
|
2017-03-30 02:43:52 +08:00
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, i);
|
|
|
|
if (!res)
|
|
|
|
break;
|
|
|
|
|
2016-12-22 18:38:21 +08:00
|
|
|
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;
|
|
|
|
|
2017-10-17 19:36:13 +08:00
|
|
|
priv->thermal_init(tsc);
|
2016-12-22 18:38:21 +08:00
|
|
|
rcar_gen3_thermal_calc_coefs(&tsc->coef, ptat, thcode[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;
|
2017-03-30 02:43:54 +08:00
|
|
|
|
|
|
|
ret = of_thermal_get_ntrips(tsc->zone);
|
|
|
|
if (ret < 0)
|
|
|
|
goto error_unregister;
|
|
|
|
|
2019-02-12 03:56:20 +08:00
|
|
|
tsc->zone->tzp->no_hwmon = false;
|
|
|
|
ret = thermal_add_hwmon_sysfs(tsc->zone);
|
|
|
|
if (ret)
|
|
|
|
goto error_unregister;
|
|
|
|
|
|
|
|
ret = devm_add_action(dev, rcar_gen3_hwmon_action, zone);
|
|
|
|
if (ret) {
|
|
|
|
rcar_gen3_hwmon_action(zone);
|
|
|
|
goto error_unregister;
|
|
|
|
}
|
|
|
|
|
2017-03-30 02:43:54 +08:00
|
|
|
dev_info(dev, "TSC%d: Loaded %d trip points\n", i, ret);
|
2016-12-22 18:38:21 +08:00
|
|
|
}
|
|
|
|
|
2017-03-30 02:43:53 +08:00
|
|
|
priv->num_tscs = i;
|
|
|
|
|
|
|
|
if (!priv->num_tscs) {
|
|
|
|
ret = -ENODEV;
|
|
|
|
goto error_unregister;
|
|
|
|
}
|
|
|
|
|
2017-03-30 02:43:54 +08:00
|
|
|
rcar_thermal_irq_set(priv, true);
|
|
|
|
|
2016-12-22 18:38:21 +08:00
|
|
|
return 0;
|
|
|
|
|
|
|
|
error_unregister:
|
|
|
|
rcar_gen3_thermal_remove(pdev);
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2017-03-30 02:43:56 +08:00
|
|
|
static int __maybe_unused rcar_gen3_thermal_suspend(struct device *dev)
|
|
|
|
{
|
|
|
|
struct rcar_gen3_thermal_priv *priv = dev_get_drvdata(dev);
|
|
|
|
|
|
|
|
rcar_thermal_irq_set(priv, false);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
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];
|
|
|
|
|
2017-10-17 19:36:13 +08:00
|
|
|
priv->thermal_init(tsc);
|
2017-03-30 02:43:56 +08:00
|
|
|
rcar_gen3_thermal_set_trips(tsc, tsc->low, tsc->high);
|
|
|
|
}
|
|
|
|
|
|
|
|
rcar_thermal_irq_set(priv, true);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static SIMPLE_DEV_PM_OPS(rcar_gen3_thermal_pm_ops, rcar_gen3_thermal_suspend,
|
|
|
|
rcar_gen3_thermal_resume);
|
|
|
|
|
2016-12-22 18:38:21 +08:00
|
|
|
static struct platform_driver rcar_gen3_thermal_driver = {
|
|
|
|
.driver = {
|
|
|
|
.name = "rcar_gen3_thermal",
|
2017-03-30 02:43:56 +08:00
|
|
|
.pm = &rcar_gen3_thermal_pm_ops,
|
2016-12-22 18:38:21 +08:00
|
|
|
.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>");
|