thermal: sprd: Add Spreadtrum thermal driver support
This patch adds the support for Spreadtrum thermal sensor controller, which can support maximum 8 sensors. Signed-off-by: Freeman Liu <freeman.liu@unisoc.com> Co-developed-with: Baolin Wang <baolin.wang@unisoc.com> Signed-off-by: Baolin Wang <baolin.wang7@gmail.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Link: https://lore.kernel.org/r/ebeb2839cff4d4027b37e787427c5af0e11880c8.1582013101.git.baolin.wang7@gmail.com
This commit is contained in:
Freeman Liu
Daniel Lezcano
parent
f2ccf917ad
commit
554fdbaf19
@ -460,4 +460,11 @@ config UNIPHIER_THERMAL
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Enable this to plug in UniPhier on-chip PVT thermal driver into the
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thermal framework. The driver supports CPU thermal zone temperature
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reporting and a couple of trip points.
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config SPRD_THERMAL
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tristate "Temperature sensor on Spreadtrum SoCs"
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depends on ARCH_SPRD || COMPILE_TEST
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help
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Support for the Spreadtrum thermal sensor driver in the Linux thermal
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framework.
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endif
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@ -57,3 +57,4 @@ obj-$(CONFIG_GENERIC_ADC_THERMAL) += thermal-generic-adc.o
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obj-$(CONFIG_ZX2967_THERMAL) += zx2967_thermal.o
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obj-$(CONFIG_UNIPHIER_THERMAL) += uniphier_thermal.o
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obj-$(CONFIG_AMLOGIC_THERMAL) += amlogic_thermal.o
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obj-$(CONFIG_SPRD_THERMAL) += sprd_thermal.o
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552
drivers/thermal/sprd_thermal.c
Normal file
552
drivers/thermal/sprd_thermal.c
Normal file
@ -0,0 +1,552 @@
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2020 Spreadtrum Communications Inc.
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#include <linux/clk.h>
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#include <linux/io.h>
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#include <linux/iopoll.h>
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#include <linux/module.h>
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#include <linux/nvmem-consumer.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/slab.h>
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#include <linux/thermal.h>
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#define SPRD_THM_CTL 0x0
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#define SPRD_THM_INT_EN 0x4
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#define SPRD_THM_INT_STS 0x8
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#define SPRD_THM_INT_RAW_STS 0xc
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#define SPRD_THM_DET_PERIOD 0x10
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#define SPRD_THM_INT_CLR 0x14
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#define SPRD_THM_INT_CLR_ST 0x18
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#define SPRD_THM_MON_PERIOD 0x4c
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#define SPRD_THM_MON_CTL 0x50
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#define SPRD_THM_INTERNAL_STS1 0x54
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#define SPRD_THM_RAW_READ_MSK 0x3ff
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#define SPRD_THM_OFFSET(id) ((id) * 0x4)
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#define SPRD_THM_TEMP(id) (SPRD_THM_OFFSET(id) + 0x5c)
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#define SPRD_THM_THRES(id) (SPRD_THM_OFFSET(id) + 0x2c)
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#define SPRD_THM_SEN(id) BIT((id) + 2)
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#define SPRD_THM_SEN_OVERHEAT_EN(id) BIT((id) + 8)
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#define SPRD_THM_SEN_OVERHEAT_ALARM_EN(id) BIT((id) + 0)
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/* bits definitions for register THM_CTL */
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#define SPRD_THM_SET_RDY_ST BIT(13)
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#define SPRD_THM_SET_RDY BIT(12)
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#define SPRD_THM_MON_EN BIT(1)
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#define SPRD_THM_EN BIT(0)
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/* bits definitions for register THM_INT_CTL */
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#define SPRD_THM_BIT_INT_EN BIT(26)
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#define SPRD_THM_OVERHEAT_EN BIT(25)
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#define SPRD_THM_OTP_TRIP_SHIFT 10
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/* bits definitions for register SPRD_THM_INTERNAL_STS1 */
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#define SPRD_THM_TEMPER_RDY BIT(0)
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#define SPRD_THM_DET_PERIOD_DATA 0x800
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#define SPRD_THM_DET_PERIOD_MASK GENMASK(19, 0)
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#define SPRD_THM_MON_MODE 0x7
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#define SPRD_THM_MON_MODE_MASK GENMASK(3, 0)
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#define SPRD_THM_MON_PERIOD_DATA 0x10
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#define SPRD_THM_MON_PERIOD_MASK GENMASK(15, 0)
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#define SPRD_THM_THRES_MASK GENMASK(19, 0)
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#define SPRD_THM_INT_CLR_MASK GENMASK(24, 0)
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/* thermal sensor calibration parameters */
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#define SPRD_THM_TEMP_LOW -40000
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#define SPRD_THM_TEMP_HIGH 120000
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#define SPRD_THM_OTP_TEMP 120000
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#define SPRD_THM_HOT_TEMP 75000
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#define SPRD_THM_RAW_DATA_LOW 0
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#define SPRD_THM_RAW_DATA_HIGH 1000
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#define SPRD_THM_SEN_NUM 8
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#define SPRD_THM_DT_OFFSET 24
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#define SPRD_THM_RATION_OFFSET 17
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#define SPRD_THM_RATION_SIGN 16
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#define SPRD_THM_RDYST_POLLING_TIME 10
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#define SPRD_THM_RDYST_TIMEOUT 700
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#define SPRD_THM_TEMP_READY_POLL_TIME 10000
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#define SPRD_THM_TEMP_READY_TIMEOUT 600000
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#define SPRD_THM_MAX_SENSOR 8
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struct sprd_thermal_sensor {
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struct thermal_zone_device *tzd;
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struct sprd_thermal_data *data;
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struct device *dev;
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int cal_slope;
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int cal_offset;
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int id;
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};
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struct sprd_thermal_data {
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const struct sprd_thm_variant_data *var_data;
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struct sprd_thermal_sensor *sensor[SPRD_THM_MAX_SENSOR];
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struct clk *clk;
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void __iomem *base;
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u32 ratio_off;
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int ratio_sign;
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int nr_sensors;
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};
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/*
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* The conversion between ADC and temperature is based on linear relationship,
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* and use idea_k to specify the slope and ideal_b to specify the offset.
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*
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* Since different Spreadtrum SoCs have different ideal_k and ideal_b,
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* we should save ideal_k and ideal_b in the device data structure.
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*/
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struct sprd_thm_variant_data {
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u32 ideal_k;
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u32 ideal_b;
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};
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static const struct sprd_thm_variant_data ums512_data = {
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.ideal_k = 262,
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.ideal_b = 66400,
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};
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static inline void sprd_thm_update_bits(void __iomem *reg, u32 mask, u32 val)
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{
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u32 tmp, orig;
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orig = readl(reg);
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tmp = orig & ~mask;
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tmp |= val & mask;
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writel(tmp, reg);
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}
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static int sprd_thm_cal_read(struct device_node *np, const char *cell_id,
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u32 *val)
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{
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struct nvmem_cell *cell;
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void *buf;
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size_t len;
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cell = of_nvmem_cell_get(np, cell_id);
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if (IS_ERR(cell))
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return PTR_ERR(cell);
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buf = nvmem_cell_read(cell, &len);
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nvmem_cell_put(cell);
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if (IS_ERR(buf))
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return PTR_ERR(buf);
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if (len > sizeof(u32)) {
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kfree(buf);
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return -EINVAL;
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}
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memcpy(val, buf, len);
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kfree(buf);
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return 0;
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}
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static int sprd_thm_sensor_calibration(struct device_node *np,
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struct sprd_thermal_data *thm,
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struct sprd_thermal_sensor *sen)
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{
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int ret;
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/*
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* According to thermal datasheet, the default calibration offset is 64,
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* and the default ratio is 1000.
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*/
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int dt_offset = 64, ratio = 1000;
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ret = sprd_thm_cal_read(np, "sen_delta_cal", &dt_offset);
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if (ret)
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return ret;
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ratio += thm->ratio_sign * thm->ratio_off;
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/*
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* According to the ideal slope K and ideal offset B, combined with
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* calibration value of thermal from efuse, then calibrate the real
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* slope k and offset b:
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* k_cal = (k * ratio) / 1000.
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* b_cal = b + (dt_offset - 64) * 500.
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*/
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sen->cal_slope = (thm->var_data->ideal_k * ratio) / 1000;
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sen->cal_offset = thm->var_data->ideal_b + (dt_offset - 128) * 250;
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return 0;
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}
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static int sprd_thm_rawdata_to_temp(struct sprd_thermal_sensor *sen,
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u32 rawdata)
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{
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clamp(rawdata, (u32)SPRD_THM_RAW_DATA_LOW, (u32)SPRD_THM_RAW_DATA_HIGH);
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/*
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* According to the thermal datasheet, the formula of converting
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* adc value to the temperature value should be:
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* T_final = k_cal * x - b_cal.
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*/
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return sen->cal_slope * rawdata - sen->cal_offset;
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}
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static int sprd_thm_temp_to_rawdata(int temp, struct sprd_thermal_sensor *sen)
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{
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u32 val;
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clamp(temp, (int)SPRD_THM_TEMP_LOW, (int)SPRD_THM_TEMP_HIGH);
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/*
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* According to the thermal datasheet, the formula of converting
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* adc value to the temperature value should be:
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* T_final = k_cal * x - b_cal.
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*/
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val = (temp + sen->cal_offset) / sen->cal_slope;
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return clamp(val, val, (u32)(SPRD_THM_RAW_DATA_HIGH - 1));
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}
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static int sprd_thm_read_temp(void *devdata, int *temp)
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{
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struct sprd_thermal_sensor *sen = devdata;
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u32 data;
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data = readl(sen->data->base + SPRD_THM_TEMP(sen->id)) &
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SPRD_THM_RAW_READ_MSK;
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*temp = sprd_thm_rawdata_to_temp(sen, data);
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return 0;
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}
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static const struct thermal_zone_of_device_ops sprd_thm_ops = {
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.get_temp = sprd_thm_read_temp,
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};
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static int sprd_thm_poll_ready_status(struct sprd_thermal_data *thm)
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{
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u32 val;
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int ret;
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/*
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* Wait for thermal ready status before configuring thermal parameters.
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*/
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ret = readl_poll_timeout(thm->base + SPRD_THM_CTL, val,
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!(val & SPRD_THM_SET_RDY_ST),
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SPRD_THM_RDYST_POLLING_TIME,
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SPRD_THM_RDYST_TIMEOUT);
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if (ret)
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return ret;
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sprd_thm_update_bits(thm->base + SPRD_THM_CTL, SPRD_THM_MON_EN,
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SPRD_THM_MON_EN);
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sprd_thm_update_bits(thm->base + SPRD_THM_CTL, SPRD_THM_SET_RDY,
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SPRD_THM_SET_RDY);
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return 0;
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}
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static int sprd_thm_wait_temp_ready(struct sprd_thermal_data *thm)
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{
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u32 val;
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/* Wait for first temperature data ready before reading temperature */
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return readl_poll_timeout(thm->base + SPRD_THM_INTERNAL_STS1, val,
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!(val & SPRD_THM_TEMPER_RDY),
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SPRD_THM_TEMP_READY_POLL_TIME,
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SPRD_THM_TEMP_READY_TIMEOUT);
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}
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static int sprd_thm_set_ready(struct sprd_thermal_data *thm)
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{
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int ret;
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ret = sprd_thm_poll_ready_status(thm);
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if (ret)
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return ret;
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/*
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* Clear interrupt status, enable thermal interrupt and enable thermal.
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*
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* The SPRD thermal controller integrates a hardware interrupt signal,
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* which means if the temperature is overheat, it will generate an
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* interrupt and notify the event to PMIC automatically to shutdown the
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* system. So here we should enable the interrupt bits, though we have
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* not registered an irq handler.
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*/
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writel(SPRD_THM_INT_CLR_MASK, thm->base + SPRD_THM_INT_CLR);
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sprd_thm_update_bits(thm->base + SPRD_THM_INT_EN,
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SPRD_THM_BIT_INT_EN, SPRD_THM_BIT_INT_EN);
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sprd_thm_update_bits(thm->base + SPRD_THM_CTL,
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SPRD_THM_EN, SPRD_THM_EN);
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return 0;
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}
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static void sprd_thm_sensor_init(struct sprd_thermal_data *thm,
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struct sprd_thermal_sensor *sen)
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{
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u32 otp_rawdata, hot_rawdata;
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otp_rawdata = sprd_thm_temp_to_rawdata(SPRD_THM_OTP_TEMP, sen);
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hot_rawdata = sprd_thm_temp_to_rawdata(SPRD_THM_HOT_TEMP, sen);
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/* Enable the sensor' overheat temperature protection interrupt */
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sprd_thm_update_bits(thm->base + SPRD_THM_INT_EN,
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SPRD_THM_SEN_OVERHEAT_ALARM_EN(sen->id),
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SPRD_THM_SEN_OVERHEAT_ALARM_EN(sen->id));
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/* Set the sensor' overheat and hot threshold temperature */
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sprd_thm_update_bits(thm->base + SPRD_THM_THRES(sen->id),
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SPRD_THM_THRES_MASK,
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(otp_rawdata << SPRD_THM_OTP_TRIP_SHIFT) |
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hot_rawdata);
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/* Enable the corresponding sensor */
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sprd_thm_update_bits(thm->base + SPRD_THM_CTL, SPRD_THM_SEN(sen->id),
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SPRD_THM_SEN(sen->id));
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}
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static void sprd_thm_para_config(struct sprd_thermal_data *thm)
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{
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/* Set the period of two valid temperature detection action */
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sprd_thm_update_bits(thm->base + SPRD_THM_DET_PERIOD,
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SPRD_THM_DET_PERIOD_MASK, SPRD_THM_DET_PERIOD);
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/* Set the sensors' monitor mode */
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sprd_thm_update_bits(thm->base + SPRD_THM_MON_CTL,
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SPRD_THM_MON_MODE_MASK, SPRD_THM_MON_MODE);
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/* Set the sensors' monitor period */
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sprd_thm_update_bits(thm->base + SPRD_THM_MON_PERIOD,
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SPRD_THM_MON_PERIOD_MASK, SPRD_THM_MON_PERIOD);
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}
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static void sprd_thm_toggle_sensor(struct sprd_thermal_sensor *sen, bool on)
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{
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struct thermal_zone_device *tzd = sen->tzd;
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tzd->ops->set_mode(tzd,
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on ? THERMAL_DEVICE_ENABLED : THERMAL_DEVICE_DISABLED);
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}
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static int sprd_thm_probe(struct platform_device *pdev)
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{
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struct device_node *np = pdev->dev.of_node;
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struct device_node *sen_child;
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struct sprd_thermal_data *thm;
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struct sprd_thermal_sensor *sen;
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const struct sprd_thm_variant_data *pdata;
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int ret, i;
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u32 val;
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pdata = of_device_get_match_data(&pdev->dev);
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if (!pdata) {
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dev_err(&pdev->dev, "No matching driver data found\n");
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return -EINVAL;
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}
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thm = devm_kzalloc(&pdev->dev, sizeof(*thm), GFP_KERNEL);
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if (!thm)
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return -ENOMEM;
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thm->var_data = pdata;
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thm->base = devm_platform_ioremap_resource(pdev, 0);
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if (!thm->base)
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return -ENOMEM;
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thm->nr_sensors = of_get_child_count(np);
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if (thm->nr_sensors == 0 || thm->nr_sensors > SPRD_THM_MAX_SENSOR) {
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dev_err(&pdev->dev, "incorrect sensor count\n");
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return -EINVAL;
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}
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thm->clk = devm_clk_get(&pdev->dev, "enable");
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if (IS_ERR(thm->clk)) {
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dev_err(&pdev->dev, "failed to get enable clock\n");
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return PTR_ERR(thm->clk);
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}
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ret = clk_prepare_enable(thm->clk);
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if (ret)
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return ret;
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sprd_thm_para_config(thm);
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ret = sprd_thm_cal_read(np, "thm_sign_cal", &val);
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if (ret)
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goto disable_clk;
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if (val > 0)
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thm->ratio_sign = -1;
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else
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thm->ratio_sign = 1;
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ret = sprd_thm_cal_read(np, "thm_ratio_cal", &thm->ratio_off);
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if (ret)
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goto disable_clk;
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for_each_child_of_node(np, sen_child) {
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sen = devm_kzalloc(&pdev->dev, sizeof(*sen), GFP_KERNEL);
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if (!sen) {
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ret = -ENOMEM;
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goto disable_clk;
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}
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sen->data = thm;
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sen->dev = &pdev->dev;
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ret = of_property_read_u32(sen_child, "reg", &sen->id);
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if (ret) {
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dev_err(&pdev->dev, "get sensor reg failed");
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goto disable_clk;
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}
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ret = sprd_thm_sensor_calibration(sen_child, thm, sen);
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if (ret) {
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dev_err(&pdev->dev, "efuse cal analysis failed");
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goto disable_clk;
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}
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sprd_thm_sensor_init(thm, sen);
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sen->tzd = devm_thermal_zone_of_sensor_register(sen->dev,
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sen->id,
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sen,
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&sprd_thm_ops);
|
||||
if (IS_ERR(sen->tzd)) {
|
||||
dev_err(&pdev->dev, "register thermal zone failed %d\n",
|
||||
sen->id);
|
||||
ret = PTR_ERR(sen->tzd);
|
||||
goto disable_clk;
|
||||
}
|
||||
|
||||
thm->sensor[sen->id] = sen;
|
||||
}
|
||||
|
||||
ret = sprd_thm_set_ready(thm);
|
||||
if (ret)
|
||||
goto disable_clk;
|
||||
|
||||
ret = sprd_thm_wait_temp_ready(thm);
|
||||
if (ret)
|
||||
goto disable_clk;
|
||||
|
||||
for (i = 0; i < thm->nr_sensors; i++)
|
||||
sprd_thm_toggle_sensor(thm->sensor[i], true);
|
||||
|
||||
platform_set_drvdata(pdev, thm);
|
||||
return 0;
|
||||
|
||||
disable_clk:
|
||||
clk_disable_unprepare(thm->clk);
|
||||
return ret;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_PM_SLEEP
|
||||
static void sprd_thm_hw_suspend(struct sprd_thermal_data *thm)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; i < thm->nr_sensors; i++) {
|
||||
sprd_thm_update_bits(thm->base + SPRD_THM_CTL,
|
||||
SPRD_THM_SEN(thm->sensor[i]->id), 0);
|
||||
}
|
||||
|
||||
sprd_thm_update_bits(thm->base + SPRD_THM_CTL,
|
||||
SPRD_THM_EN, 0x0);
|
||||
}
|
||||
|
||||
static int sprd_thm_suspend(struct device *dev)
|
||||
{
|
||||
struct sprd_thermal_data *thm = dev_get_drvdata(dev);
|
||||
int i;
|
||||
|
||||
for (i = 0; i < thm->nr_sensors; i++)
|
||||
sprd_thm_toggle_sensor(thm->sensor[i], false);
|
||||
|
||||
sprd_thm_hw_suspend(thm);
|
||||
clk_disable_unprepare(thm->clk);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int sprd_thm_hw_resume(struct sprd_thermal_data *thm)
|
||||
{
|
||||
int ret, i;
|
||||
|
||||
for (i = 0; i < thm->nr_sensors; i++) {
|
||||
sprd_thm_update_bits(thm->base + SPRD_THM_CTL,
|
||||
SPRD_THM_SEN(thm->sensor[i]->id),
|
||||
SPRD_THM_SEN(thm->sensor[i]->id));
|
||||
}
|
||||
|
||||
ret = sprd_thm_poll_ready_status(thm);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
writel(SPRD_THM_INT_CLR_MASK, thm->base + SPRD_THM_INT_CLR);
|
||||
sprd_thm_update_bits(thm->base + SPRD_THM_CTL,
|
||||
SPRD_THM_EN, SPRD_THM_EN);
|
||||
return sprd_thm_wait_temp_ready(thm);
|
||||
}
|
||||
|
||||
static int sprd_thm_resume(struct device *dev)
|
||||
{
|
||||
struct sprd_thermal_data *thm = dev_get_drvdata(dev);
|
||||
int ret, i;
|
||||
|
||||
ret = clk_prepare_enable(thm->clk);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = sprd_thm_hw_resume(thm);
|
||||
if (ret)
|
||||
goto disable_clk;
|
||||
|
||||
for (i = 0; i < thm->nr_sensors; i++)
|
||||
sprd_thm_toggle_sensor(thm->sensor[i], true);
|
||||
|
||||
return 0;
|
||||
|
||||
disable_clk:
|
||||
clk_disable_unprepare(thm->clk);
|
||||
return ret;
|
||||
}
|
||||
#endif
|
||||
|
||||
static int sprd_thm_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct sprd_thermal_data *thm = platform_get_drvdata(pdev);
|
||||
int i;
|
||||
|
||||
for (i = 0; i < thm->nr_sensors; i++) {
|
||||
sprd_thm_toggle_sensor(thm->sensor[i], false);
|
||||
devm_thermal_zone_of_sensor_unregister(&pdev->dev,
|
||||
thm->sensor[i]->tzd);
|
||||
}
|
||||
|
||||
clk_disable_unprepare(thm->clk);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct of_device_id sprd_thermal_of_match[] = {
|
||||
{ .compatible = "sprd,ums512-thermal", .data = &ums512_data },
|
||||
{ },
|
||||
};
|
||||
|
||||
static const struct dev_pm_ops sprd_thermal_pm_ops = {
|
||||
SET_SYSTEM_SLEEP_PM_OPS(sprd_thm_suspend, sprd_thm_resume)
|
||||
};
|
||||
|
||||
static struct platform_driver sprd_thermal_driver = {
|
||||
.probe = sprd_thm_probe,
|
||||
.remove = sprd_thm_remove,
|
||||
.driver = {
|
||||
.name = "sprd-thermal",
|
||||
.pm = &sprd_thermal_pm_ops,
|
||||
.of_match_table = sprd_thermal_of_match,
|
||||
},
|
||||
};
|
||||
|
||||
module_platform_driver(sprd_thermal_driver);
|
||||
|
||||
MODULE_AUTHOR("Freeman Liu <freeman.liu@unisoc.com>");
|
||||
MODULE_DESCRIPTION("Spreadtrum thermal driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
Loading…
Reference in New Issue
Block a user