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dev_err_probe() can reduce code size, uniform error handling and record the defer probe reason etc., use it to simplify the code. Signed-off-by: Anson Huang <Anson.Huang@nxp.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Link: https://lore.kernel.org/r/1597129185-8460-1-git-send-email-Anson.Huang@nxp.com
899 lines
24 KiB
C
899 lines
24 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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// Copyright 2013 Freescale Semiconductor, Inc.
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#include <linux/clk.h>
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#include <linux/cpufreq.h>
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#include <linux/cpu_cooling.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/mfd/syscon.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/regmap.h>
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#include <linux/thermal.h>
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#include <linux/nvmem-consumer.h>
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#define REG_SET 0x4
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#define REG_CLR 0x8
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#define REG_TOG 0xc
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/* i.MX6 specific */
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#define IMX6_MISC0 0x0150
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#define IMX6_MISC0_REFTOP_SELBIASOFF (1 << 3)
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#define IMX6_MISC1 0x0160
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#define IMX6_MISC1_IRQ_TEMPHIGH (1 << 29)
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/* Below LOW and PANIC bits are only for TEMPMON_IMX6SX */
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#define IMX6_MISC1_IRQ_TEMPLOW (1 << 28)
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#define IMX6_MISC1_IRQ_TEMPPANIC (1 << 27)
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#define IMX6_TEMPSENSE0 0x0180
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#define IMX6_TEMPSENSE0_ALARM_VALUE_SHIFT 20
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#define IMX6_TEMPSENSE0_ALARM_VALUE_MASK (0xfff << 20)
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#define IMX6_TEMPSENSE0_TEMP_CNT_SHIFT 8
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#define IMX6_TEMPSENSE0_TEMP_CNT_MASK (0xfff << 8)
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#define IMX6_TEMPSENSE0_FINISHED (1 << 2)
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#define IMX6_TEMPSENSE0_MEASURE_TEMP (1 << 1)
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#define IMX6_TEMPSENSE0_POWER_DOWN (1 << 0)
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#define IMX6_TEMPSENSE1 0x0190
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#define IMX6_TEMPSENSE1_MEASURE_FREQ 0xffff
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#define IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT 0
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#define OCOTP_MEM0 0x0480
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#define OCOTP_ANA1 0x04e0
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/* Below TEMPSENSE2 is only for TEMPMON_IMX6SX */
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#define IMX6_TEMPSENSE2 0x0290
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#define IMX6_TEMPSENSE2_LOW_VALUE_SHIFT 0
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#define IMX6_TEMPSENSE2_LOW_VALUE_MASK 0xfff
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#define IMX6_TEMPSENSE2_PANIC_VALUE_SHIFT 16
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#define IMX6_TEMPSENSE2_PANIC_VALUE_MASK 0xfff0000
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/* i.MX7 specific */
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#define IMX7_ANADIG_DIGPROG 0x800
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#define IMX7_TEMPSENSE0 0x300
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#define IMX7_TEMPSENSE0_PANIC_ALARM_SHIFT 18
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#define IMX7_TEMPSENSE0_PANIC_ALARM_MASK (0x1ff << 18)
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#define IMX7_TEMPSENSE0_HIGH_ALARM_SHIFT 9
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#define IMX7_TEMPSENSE0_HIGH_ALARM_MASK (0x1ff << 9)
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#define IMX7_TEMPSENSE0_LOW_ALARM_SHIFT 0
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#define IMX7_TEMPSENSE0_LOW_ALARM_MASK 0x1ff
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#define IMX7_TEMPSENSE1 0x310
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#define IMX7_TEMPSENSE1_MEASURE_FREQ_SHIFT 16
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#define IMX7_TEMPSENSE1_MEASURE_FREQ_MASK (0xffff << 16)
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#define IMX7_TEMPSENSE1_FINISHED (1 << 11)
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#define IMX7_TEMPSENSE1_MEASURE_TEMP (1 << 10)
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#define IMX7_TEMPSENSE1_POWER_DOWN (1 << 9)
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#define IMX7_TEMPSENSE1_TEMP_VALUE_SHIFT 0
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#define IMX7_TEMPSENSE1_TEMP_VALUE_MASK 0x1ff
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/* The driver supports 1 passive trip point and 1 critical trip point */
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enum imx_thermal_trip {
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IMX_TRIP_PASSIVE,
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IMX_TRIP_CRITICAL,
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IMX_TRIP_NUM,
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};
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#define IMX_POLLING_DELAY 2000 /* millisecond */
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#define IMX_PASSIVE_DELAY 1000
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#define TEMPMON_IMX6Q 1
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#define TEMPMON_IMX6SX 2
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#define TEMPMON_IMX7D 3
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struct thermal_soc_data {
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u32 version;
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u32 sensor_ctrl;
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u32 power_down_mask;
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u32 measure_temp_mask;
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u32 measure_freq_ctrl;
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u32 measure_freq_mask;
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u32 measure_freq_shift;
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u32 temp_data;
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u32 temp_value_mask;
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u32 temp_value_shift;
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u32 temp_valid_mask;
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u32 panic_alarm_ctrl;
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u32 panic_alarm_mask;
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u32 panic_alarm_shift;
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u32 high_alarm_ctrl;
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u32 high_alarm_mask;
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u32 high_alarm_shift;
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u32 low_alarm_ctrl;
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u32 low_alarm_mask;
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u32 low_alarm_shift;
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};
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static struct thermal_soc_data thermal_imx6q_data = {
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.version = TEMPMON_IMX6Q,
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.sensor_ctrl = IMX6_TEMPSENSE0,
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.power_down_mask = IMX6_TEMPSENSE0_POWER_DOWN,
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.measure_temp_mask = IMX6_TEMPSENSE0_MEASURE_TEMP,
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.measure_freq_ctrl = IMX6_TEMPSENSE1,
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.measure_freq_shift = IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT,
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.measure_freq_mask = IMX6_TEMPSENSE1_MEASURE_FREQ,
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.temp_data = IMX6_TEMPSENSE0,
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.temp_value_mask = IMX6_TEMPSENSE0_TEMP_CNT_MASK,
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.temp_value_shift = IMX6_TEMPSENSE0_TEMP_CNT_SHIFT,
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.temp_valid_mask = IMX6_TEMPSENSE0_FINISHED,
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.high_alarm_ctrl = IMX6_TEMPSENSE0,
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.high_alarm_mask = IMX6_TEMPSENSE0_ALARM_VALUE_MASK,
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.high_alarm_shift = IMX6_TEMPSENSE0_ALARM_VALUE_SHIFT,
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};
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static struct thermal_soc_data thermal_imx6sx_data = {
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.version = TEMPMON_IMX6SX,
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.sensor_ctrl = IMX6_TEMPSENSE0,
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.power_down_mask = IMX6_TEMPSENSE0_POWER_DOWN,
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.measure_temp_mask = IMX6_TEMPSENSE0_MEASURE_TEMP,
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.measure_freq_ctrl = IMX6_TEMPSENSE1,
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.measure_freq_shift = IMX6_TEMPSENSE1_MEASURE_FREQ_SHIFT,
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.measure_freq_mask = IMX6_TEMPSENSE1_MEASURE_FREQ,
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.temp_data = IMX6_TEMPSENSE0,
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.temp_value_mask = IMX6_TEMPSENSE0_TEMP_CNT_MASK,
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.temp_value_shift = IMX6_TEMPSENSE0_TEMP_CNT_SHIFT,
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.temp_valid_mask = IMX6_TEMPSENSE0_FINISHED,
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.high_alarm_ctrl = IMX6_TEMPSENSE0,
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.high_alarm_mask = IMX6_TEMPSENSE0_ALARM_VALUE_MASK,
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.high_alarm_shift = IMX6_TEMPSENSE0_ALARM_VALUE_SHIFT,
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.panic_alarm_ctrl = IMX6_TEMPSENSE2,
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.panic_alarm_mask = IMX6_TEMPSENSE2_PANIC_VALUE_MASK,
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.panic_alarm_shift = IMX6_TEMPSENSE2_PANIC_VALUE_SHIFT,
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.low_alarm_ctrl = IMX6_TEMPSENSE2,
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.low_alarm_mask = IMX6_TEMPSENSE2_LOW_VALUE_MASK,
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.low_alarm_shift = IMX6_TEMPSENSE2_LOW_VALUE_SHIFT,
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};
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static struct thermal_soc_data thermal_imx7d_data = {
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.version = TEMPMON_IMX7D,
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.sensor_ctrl = IMX7_TEMPSENSE1,
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.power_down_mask = IMX7_TEMPSENSE1_POWER_DOWN,
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.measure_temp_mask = IMX7_TEMPSENSE1_MEASURE_TEMP,
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.measure_freq_ctrl = IMX7_TEMPSENSE1,
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.measure_freq_shift = IMX7_TEMPSENSE1_MEASURE_FREQ_SHIFT,
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.measure_freq_mask = IMX7_TEMPSENSE1_MEASURE_FREQ_MASK,
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.temp_data = IMX7_TEMPSENSE1,
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.temp_value_mask = IMX7_TEMPSENSE1_TEMP_VALUE_MASK,
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.temp_value_shift = IMX7_TEMPSENSE1_TEMP_VALUE_SHIFT,
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.temp_valid_mask = IMX7_TEMPSENSE1_FINISHED,
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.panic_alarm_ctrl = IMX7_TEMPSENSE1,
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.panic_alarm_mask = IMX7_TEMPSENSE0_PANIC_ALARM_MASK,
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.panic_alarm_shift = IMX7_TEMPSENSE0_PANIC_ALARM_SHIFT,
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.high_alarm_ctrl = IMX7_TEMPSENSE0,
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.high_alarm_mask = IMX7_TEMPSENSE0_HIGH_ALARM_MASK,
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.high_alarm_shift = IMX7_TEMPSENSE0_HIGH_ALARM_SHIFT,
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.low_alarm_ctrl = IMX7_TEMPSENSE0,
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.low_alarm_mask = IMX7_TEMPSENSE0_LOW_ALARM_MASK,
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.low_alarm_shift = IMX7_TEMPSENSE0_LOW_ALARM_SHIFT,
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};
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struct imx_thermal_data {
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struct cpufreq_policy *policy;
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struct thermal_zone_device *tz;
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struct thermal_cooling_device *cdev;
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struct regmap *tempmon;
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u32 c1, c2; /* See formula in imx_init_calib() */
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int temp_passive;
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int temp_critical;
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int temp_max;
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int alarm_temp;
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int last_temp;
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bool irq_enabled;
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int irq;
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struct clk *thermal_clk;
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const struct thermal_soc_data *socdata;
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const char *temp_grade;
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};
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static void imx_set_panic_temp(struct imx_thermal_data *data,
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int panic_temp)
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{
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const struct thermal_soc_data *soc_data = data->socdata;
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struct regmap *map = data->tempmon;
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int critical_value;
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critical_value = (data->c2 - panic_temp) / data->c1;
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regmap_write(map, soc_data->panic_alarm_ctrl + REG_CLR,
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soc_data->panic_alarm_mask);
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regmap_write(map, soc_data->panic_alarm_ctrl + REG_SET,
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critical_value << soc_data->panic_alarm_shift);
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}
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static void imx_set_alarm_temp(struct imx_thermal_data *data,
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int alarm_temp)
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{
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struct regmap *map = data->tempmon;
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const struct thermal_soc_data *soc_data = data->socdata;
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int alarm_value;
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data->alarm_temp = alarm_temp;
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if (data->socdata->version == TEMPMON_IMX7D)
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alarm_value = alarm_temp / 1000 + data->c1 - 25;
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else
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alarm_value = (data->c2 - alarm_temp) / data->c1;
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regmap_write(map, soc_data->high_alarm_ctrl + REG_CLR,
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soc_data->high_alarm_mask);
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regmap_write(map, soc_data->high_alarm_ctrl + REG_SET,
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alarm_value << soc_data->high_alarm_shift);
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}
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static int imx_get_temp(struct thermal_zone_device *tz, int *temp)
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{
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struct imx_thermal_data *data = tz->devdata;
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const struct thermal_soc_data *soc_data = data->socdata;
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struct regmap *map = data->tempmon;
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unsigned int n_meas;
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bool wait, run_measurement;
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u32 val;
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run_measurement = !data->irq_enabled;
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if (!run_measurement) {
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/* Check if a measurement is currently in progress */
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regmap_read(map, soc_data->temp_data, &val);
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wait = !(val & soc_data->temp_valid_mask);
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} else {
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/*
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* Every time we measure the temperature, we will power on the
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* temperature sensor, enable measurements, take a reading,
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* disable measurements, power off the temperature sensor.
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*/
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regmap_write(map, soc_data->sensor_ctrl + REG_CLR,
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soc_data->power_down_mask);
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regmap_write(map, soc_data->sensor_ctrl + REG_SET,
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soc_data->measure_temp_mask);
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wait = true;
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}
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/*
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* According to the temp sensor designers, it may require up to ~17us
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* to complete a measurement.
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*/
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if (wait)
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usleep_range(20, 50);
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regmap_read(map, soc_data->temp_data, &val);
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if (run_measurement) {
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regmap_write(map, soc_data->sensor_ctrl + REG_CLR,
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soc_data->measure_temp_mask);
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regmap_write(map, soc_data->sensor_ctrl + REG_SET,
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soc_data->power_down_mask);
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}
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if ((val & soc_data->temp_valid_mask) == 0) {
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dev_dbg(&tz->device, "temp measurement never finished\n");
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return -EAGAIN;
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}
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n_meas = (val & soc_data->temp_value_mask)
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>> soc_data->temp_value_shift;
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/* See imx_init_calib() for formula derivation */
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if (data->socdata->version == TEMPMON_IMX7D)
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*temp = (n_meas - data->c1 + 25) * 1000;
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else
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*temp = data->c2 - n_meas * data->c1;
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/* Update alarm value to next higher trip point for TEMPMON_IMX6Q */
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if (data->socdata->version == TEMPMON_IMX6Q) {
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if (data->alarm_temp == data->temp_passive &&
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*temp >= data->temp_passive)
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imx_set_alarm_temp(data, data->temp_critical);
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if (data->alarm_temp == data->temp_critical &&
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*temp < data->temp_passive) {
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imx_set_alarm_temp(data, data->temp_passive);
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dev_dbg(&tz->device, "thermal alarm off: T < %d\n",
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data->alarm_temp / 1000);
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}
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}
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if (*temp != data->last_temp) {
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dev_dbg(&tz->device, "millicelsius: %d\n", *temp);
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data->last_temp = *temp;
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}
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/* Reenable alarm IRQ if temperature below alarm temperature */
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if (!data->irq_enabled && *temp < data->alarm_temp) {
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data->irq_enabled = true;
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enable_irq(data->irq);
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}
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return 0;
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}
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static int imx_change_mode(struct thermal_zone_device *tz,
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enum thermal_device_mode mode)
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{
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struct imx_thermal_data *data = tz->devdata;
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struct regmap *map = data->tempmon;
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const struct thermal_soc_data *soc_data = data->socdata;
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if (mode == THERMAL_DEVICE_ENABLED) {
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regmap_write(map, soc_data->sensor_ctrl + REG_CLR,
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soc_data->power_down_mask);
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regmap_write(map, soc_data->sensor_ctrl + REG_SET,
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soc_data->measure_temp_mask);
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if (!data->irq_enabled) {
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data->irq_enabled = true;
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enable_irq(data->irq);
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}
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} else {
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regmap_write(map, soc_data->sensor_ctrl + REG_CLR,
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soc_data->measure_temp_mask);
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regmap_write(map, soc_data->sensor_ctrl + REG_SET,
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soc_data->power_down_mask);
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if (data->irq_enabled) {
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disable_irq(data->irq);
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data->irq_enabled = false;
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}
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}
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return 0;
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}
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static int imx_get_trip_type(struct thermal_zone_device *tz, int trip,
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enum thermal_trip_type *type)
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{
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*type = (trip == IMX_TRIP_PASSIVE) ? THERMAL_TRIP_PASSIVE :
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THERMAL_TRIP_CRITICAL;
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return 0;
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}
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static int imx_get_crit_temp(struct thermal_zone_device *tz, int *temp)
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{
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struct imx_thermal_data *data = tz->devdata;
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*temp = data->temp_critical;
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return 0;
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}
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static int imx_get_trip_temp(struct thermal_zone_device *tz, int trip,
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int *temp)
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{
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struct imx_thermal_data *data = tz->devdata;
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*temp = (trip == IMX_TRIP_PASSIVE) ? data->temp_passive :
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data->temp_critical;
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return 0;
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}
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static int imx_set_trip_temp(struct thermal_zone_device *tz, int trip,
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int temp)
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{
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struct imx_thermal_data *data = tz->devdata;
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/* do not allow changing critical threshold */
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if (trip == IMX_TRIP_CRITICAL)
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return -EPERM;
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/* do not allow passive to be set higher than critical */
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if (temp < 0 || temp > data->temp_critical)
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return -EINVAL;
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data->temp_passive = temp;
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imx_set_alarm_temp(data, temp);
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return 0;
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}
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static int imx_bind(struct thermal_zone_device *tz,
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struct thermal_cooling_device *cdev)
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{
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int ret;
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ret = thermal_zone_bind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev,
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THERMAL_NO_LIMIT,
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THERMAL_NO_LIMIT,
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THERMAL_WEIGHT_DEFAULT);
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if (ret) {
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dev_err(&tz->device,
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"binding zone %s with cdev %s failed:%d\n",
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tz->type, cdev->type, ret);
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return ret;
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}
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return 0;
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}
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static int imx_unbind(struct thermal_zone_device *tz,
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struct thermal_cooling_device *cdev)
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{
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int ret;
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ret = thermal_zone_unbind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev);
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if (ret) {
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dev_err(&tz->device,
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"unbinding zone %s with cdev %s failed:%d\n",
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tz->type, cdev->type, ret);
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return ret;
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}
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return 0;
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}
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static struct thermal_zone_device_ops imx_tz_ops = {
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.bind = imx_bind,
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.unbind = imx_unbind,
|
|
.get_temp = imx_get_temp,
|
|
.change_mode = imx_change_mode,
|
|
.get_trip_type = imx_get_trip_type,
|
|
.get_trip_temp = imx_get_trip_temp,
|
|
.get_crit_temp = imx_get_crit_temp,
|
|
.set_trip_temp = imx_set_trip_temp,
|
|
};
|
|
|
|
static int imx_init_calib(struct platform_device *pdev, u32 ocotp_ana1)
|
|
{
|
|
struct imx_thermal_data *data = platform_get_drvdata(pdev);
|
|
int n1;
|
|
u64 temp64;
|
|
|
|
if (ocotp_ana1 == 0 || ocotp_ana1 == ~0) {
|
|
dev_err(&pdev->dev, "invalid sensor calibration data\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* On i.MX7D, we only use the calibration data at 25C to get the temp,
|
|
* Tmeas = ( Nmeas - n1) + 25; n1 is the fuse value for 25C.
|
|
*/
|
|
if (data->socdata->version == TEMPMON_IMX7D) {
|
|
data->c1 = (ocotp_ana1 >> 9) & 0x1ff;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* The sensor is calibrated at 25 °C (aka T1) and the value measured
|
|
* (aka N1) at this temperature is provided in bits [31:20] in the
|
|
* i.MX's OCOTP value ANA1.
|
|
* To find the actual temperature T, the following formula has to be used
|
|
* when reading value n from the sensor:
|
|
*
|
|
* T = T1 + (N - N1) / (0.4148468 - 0.0015423 * N1) °C + 3.580661 °C
|
|
* = [T1' - N1 / (0.4148468 - 0.0015423 * N1) °C] + N / (0.4148468 - 0.0015423 * N1) °C
|
|
* = [T1' + N1 / (0.0015423 * N1 - 0.4148468) °C] - N / (0.0015423 * N1 - 0.4148468) °C
|
|
* = c2 - c1 * N
|
|
*
|
|
* with
|
|
*
|
|
* T1' = 28.580661 °C
|
|
* c1 = 1 / (0.0015423 * N1 - 0.4297157) °C
|
|
* c2 = T1' + N1 / (0.0015423 * N1 - 0.4148468) °C
|
|
* = T1' + N1 * c1
|
|
*/
|
|
n1 = ocotp_ana1 >> 20;
|
|
|
|
temp64 = 10000000; /* use 10^7 as fixed point constant for values in formula */
|
|
temp64 *= 1000; /* to get result in °mC */
|
|
do_div(temp64, 15423 * n1 - 4148468);
|
|
data->c1 = temp64;
|
|
data->c2 = n1 * data->c1 + 28581;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void imx_init_temp_grade(struct platform_device *pdev, u32 ocotp_mem0)
|
|
{
|
|
struct imx_thermal_data *data = platform_get_drvdata(pdev);
|
|
|
|
/* The maximum die temp is specified by the Temperature Grade */
|
|
switch ((ocotp_mem0 >> 6) & 0x3) {
|
|
case 0: /* Commercial (0 to 95 °C) */
|
|
data->temp_grade = "Commercial";
|
|
data->temp_max = 95000;
|
|
break;
|
|
case 1: /* Extended Commercial (-20 °C to 105 °C) */
|
|
data->temp_grade = "Extended Commercial";
|
|
data->temp_max = 105000;
|
|
break;
|
|
case 2: /* Industrial (-40 °C to 105 °C) */
|
|
data->temp_grade = "Industrial";
|
|
data->temp_max = 105000;
|
|
break;
|
|
case 3: /* Automotive (-40 °C to 125 °C) */
|
|
data->temp_grade = "Automotive";
|
|
data->temp_max = 125000;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Set the critical trip point at 5 °C under max
|
|
* Set the passive trip point at 10 °C under max (changeable via sysfs)
|
|
*/
|
|
data->temp_critical = data->temp_max - (1000 * 5);
|
|
data->temp_passive = data->temp_max - (1000 * 10);
|
|
}
|
|
|
|
static int imx_init_from_tempmon_data(struct platform_device *pdev)
|
|
{
|
|
struct regmap *map;
|
|
int ret;
|
|
u32 val;
|
|
|
|
map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
|
|
"fsl,tempmon-data");
|
|
if (IS_ERR(map)) {
|
|
ret = PTR_ERR(map);
|
|
dev_err(&pdev->dev, "failed to get sensor regmap: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = regmap_read(map, OCOTP_ANA1, &val);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret);
|
|
return ret;
|
|
}
|
|
ret = imx_init_calib(pdev, val);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = regmap_read(map, OCOTP_MEM0, &val);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret);
|
|
return ret;
|
|
}
|
|
imx_init_temp_grade(pdev, val);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int imx_init_from_nvmem_cells(struct platform_device *pdev)
|
|
{
|
|
int ret;
|
|
u32 val;
|
|
|
|
ret = nvmem_cell_read_u32(&pdev->dev, "calib", &val);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = imx_init_calib(pdev, val);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = nvmem_cell_read_u32(&pdev->dev, "temp_grade", &val);
|
|
if (ret)
|
|
return ret;
|
|
imx_init_temp_grade(pdev, val);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static irqreturn_t imx_thermal_alarm_irq(int irq, void *dev)
|
|
{
|
|
struct imx_thermal_data *data = dev;
|
|
|
|
disable_irq_nosync(irq);
|
|
data->irq_enabled = false;
|
|
|
|
return IRQ_WAKE_THREAD;
|
|
}
|
|
|
|
static irqreturn_t imx_thermal_alarm_irq_thread(int irq, void *dev)
|
|
{
|
|
struct imx_thermal_data *data = dev;
|
|
|
|
dev_dbg(&data->tz->device, "THERMAL ALARM: T > %d\n",
|
|
data->alarm_temp / 1000);
|
|
|
|
thermal_zone_device_update(data->tz, THERMAL_EVENT_UNSPECIFIED);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static const struct of_device_id of_imx_thermal_match[] = {
|
|
{ .compatible = "fsl,imx6q-tempmon", .data = &thermal_imx6q_data, },
|
|
{ .compatible = "fsl,imx6sx-tempmon", .data = &thermal_imx6sx_data, },
|
|
{ .compatible = "fsl,imx7d-tempmon", .data = &thermal_imx7d_data, },
|
|
{ /* end */ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, of_imx_thermal_match);
|
|
|
|
#ifdef CONFIG_CPU_FREQ
|
|
/*
|
|
* Create cooling device in case no #cooling-cells property is available in
|
|
* CPU node
|
|
*/
|
|
static int imx_thermal_register_legacy_cooling(struct imx_thermal_data *data)
|
|
{
|
|
struct device_node *np;
|
|
int ret = 0;
|
|
|
|
data->policy = cpufreq_cpu_get(0);
|
|
if (!data->policy) {
|
|
pr_debug("%s: CPUFreq policy not found\n", __func__);
|
|
return -EPROBE_DEFER;
|
|
}
|
|
|
|
np = of_get_cpu_node(data->policy->cpu, NULL);
|
|
|
|
if (!np || !of_find_property(np, "#cooling-cells", NULL)) {
|
|
data->cdev = cpufreq_cooling_register(data->policy);
|
|
if (IS_ERR(data->cdev)) {
|
|
ret = PTR_ERR(data->cdev);
|
|
cpufreq_cpu_put(data->policy);
|
|
}
|
|
}
|
|
|
|
of_node_put(np);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void imx_thermal_unregister_legacy_cooling(struct imx_thermal_data *data)
|
|
{
|
|
cpufreq_cooling_unregister(data->cdev);
|
|
cpufreq_cpu_put(data->policy);
|
|
}
|
|
|
|
#else
|
|
|
|
static inline int imx_thermal_register_legacy_cooling(struct imx_thermal_data *data)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void imx_thermal_unregister_legacy_cooling(struct imx_thermal_data *data)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
static int imx_thermal_probe(struct platform_device *pdev)
|
|
{
|
|
struct imx_thermal_data *data;
|
|
struct regmap *map;
|
|
int measure_freq;
|
|
int ret;
|
|
|
|
data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "fsl,tempmon");
|
|
if (IS_ERR(map)) {
|
|
ret = PTR_ERR(map);
|
|
dev_err(&pdev->dev, "failed to get tempmon regmap: %d\n", ret);
|
|
return ret;
|
|
}
|
|
data->tempmon = map;
|
|
|
|
data->socdata = of_device_get_match_data(&pdev->dev);
|
|
if (!data->socdata) {
|
|
dev_err(&pdev->dev, "no device match found\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* make sure the IRQ flag is clear before enabling irq on i.MX6SX */
|
|
if (data->socdata->version == TEMPMON_IMX6SX) {
|
|
regmap_write(map, IMX6_MISC1 + REG_CLR,
|
|
IMX6_MISC1_IRQ_TEMPHIGH | IMX6_MISC1_IRQ_TEMPLOW
|
|
| IMX6_MISC1_IRQ_TEMPPANIC);
|
|
/*
|
|
* reset value of LOW ALARM is incorrect, set it to lowest
|
|
* value to avoid false trigger of low alarm.
|
|
*/
|
|
regmap_write(map, data->socdata->low_alarm_ctrl + REG_SET,
|
|
data->socdata->low_alarm_mask);
|
|
}
|
|
|
|
data->irq = platform_get_irq(pdev, 0);
|
|
if (data->irq < 0)
|
|
return data->irq;
|
|
|
|
platform_set_drvdata(pdev, data);
|
|
|
|
if (of_find_property(pdev->dev.of_node, "nvmem-cells", NULL)) {
|
|
ret = imx_init_from_nvmem_cells(pdev);
|
|
if (ret)
|
|
return dev_err_probe(&pdev->dev, ret,
|
|
"failed to init from nvmem\n");
|
|
} else {
|
|
ret = imx_init_from_tempmon_data(pdev);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "failed to init from fsl,tempmon-data\n");
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
/* Make sure sensor is in known good state for measurements */
|
|
regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
|
|
data->socdata->power_down_mask);
|
|
regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
|
|
data->socdata->measure_temp_mask);
|
|
regmap_write(map, data->socdata->measure_freq_ctrl + REG_CLR,
|
|
data->socdata->measure_freq_mask);
|
|
if (data->socdata->version != TEMPMON_IMX7D)
|
|
regmap_write(map, IMX6_MISC0 + REG_SET,
|
|
IMX6_MISC0_REFTOP_SELBIASOFF);
|
|
regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
|
|
data->socdata->power_down_mask);
|
|
|
|
ret = imx_thermal_register_legacy_cooling(data);
|
|
if (ret)
|
|
return dev_err_probe(&pdev->dev, ret,
|
|
"failed to register cpufreq cooling device\n");
|
|
|
|
data->thermal_clk = devm_clk_get(&pdev->dev, NULL);
|
|
if (IS_ERR(data->thermal_clk)) {
|
|
ret = PTR_ERR(data->thermal_clk);
|
|
if (ret != -EPROBE_DEFER)
|
|
dev_err(&pdev->dev,
|
|
"failed to get thermal clk: %d\n", ret);
|
|
goto legacy_cleanup;
|
|
}
|
|
|
|
/*
|
|
* Thermal sensor needs clk on to get correct value, normally
|
|
* we should enable its clk before taking measurement and disable
|
|
* clk after measurement is done, but if alarm function is enabled,
|
|
* hardware will auto measure the temperature periodically, so we
|
|
* need to keep the clk always on for alarm function.
|
|
*/
|
|
ret = clk_prepare_enable(data->thermal_clk);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "failed to enable thermal clk: %d\n", ret);
|
|
goto legacy_cleanup;
|
|
}
|
|
|
|
data->tz = thermal_zone_device_register("imx_thermal_zone",
|
|
IMX_TRIP_NUM,
|
|
BIT(IMX_TRIP_PASSIVE), data,
|
|
&imx_tz_ops, NULL,
|
|
IMX_PASSIVE_DELAY,
|
|
IMX_POLLING_DELAY);
|
|
if (IS_ERR(data->tz)) {
|
|
ret = PTR_ERR(data->tz);
|
|
dev_err(&pdev->dev,
|
|
"failed to register thermal zone device %d\n", ret);
|
|
goto clk_disable;
|
|
}
|
|
|
|
dev_info(&pdev->dev, "%s CPU temperature grade - max:%dC"
|
|
" critical:%dC passive:%dC\n", data->temp_grade,
|
|
data->temp_max / 1000, data->temp_critical / 1000,
|
|
data->temp_passive / 1000);
|
|
|
|
/* Enable measurements at ~ 10 Hz */
|
|
regmap_write(map, data->socdata->measure_freq_ctrl + REG_CLR,
|
|
data->socdata->measure_freq_mask);
|
|
measure_freq = DIV_ROUND_UP(32768, 10); /* 10 Hz */
|
|
regmap_write(map, data->socdata->measure_freq_ctrl + REG_SET,
|
|
measure_freq << data->socdata->measure_freq_shift);
|
|
imx_set_alarm_temp(data, data->temp_passive);
|
|
|
|
if (data->socdata->version == TEMPMON_IMX6SX)
|
|
imx_set_panic_temp(data, data->temp_critical);
|
|
|
|
regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
|
|
data->socdata->power_down_mask);
|
|
regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
|
|
data->socdata->measure_temp_mask);
|
|
|
|
data->irq_enabled = true;
|
|
ret = thermal_zone_device_enable(data->tz);
|
|
if (ret)
|
|
goto thermal_zone_unregister;
|
|
|
|
ret = devm_request_threaded_irq(&pdev->dev, data->irq,
|
|
imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread,
|
|
0, "imx_thermal", data);
|
|
if (ret < 0) {
|
|
dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret);
|
|
goto thermal_zone_unregister;
|
|
}
|
|
|
|
return 0;
|
|
|
|
thermal_zone_unregister:
|
|
thermal_zone_device_unregister(data->tz);
|
|
clk_disable:
|
|
clk_disable_unprepare(data->thermal_clk);
|
|
legacy_cleanup:
|
|
imx_thermal_unregister_legacy_cooling(data);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int imx_thermal_remove(struct platform_device *pdev)
|
|
{
|
|
struct imx_thermal_data *data = platform_get_drvdata(pdev);
|
|
struct regmap *map = data->tempmon;
|
|
|
|
/* Disable measurements */
|
|
regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
|
|
data->socdata->power_down_mask);
|
|
if (!IS_ERR(data->thermal_clk))
|
|
clk_disable_unprepare(data->thermal_clk);
|
|
|
|
thermal_zone_device_unregister(data->tz);
|
|
imx_thermal_unregister_legacy_cooling(data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused imx_thermal_suspend(struct device *dev)
|
|
{
|
|
struct imx_thermal_data *data = dev_get_drvdata(dev);
|
|
int ret;
|
|
|
|
/*
|
|
* Need to disable thermal sensor, otherwise, when thermal core
|
|
* try to get temperature before thermal sensor resume, a wrong
|
|
* temperature will be read as the thermal sensor is powered
|
|
* down. This is done in change_mode() operation called from
|
|
* thermal_zone_device_disable()
|
|
*/
|
|
ret = thermal_zone_device_disable(data->tz);
|
|
if (ret)
|
|
return ret;
|
|
clk_disable_unprepare(data->thermal_clk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused imx_thermal_resume(struct device *dev)
|
|
{
|
|
struct imx_thermal_data *data = dev_get_drvdata(dev);
|
|
int ret;
|
|
|
|
ret = clk_prepare_enable(data->thermal_clk);
|
|
if (ret)
|
|
return ret;
|
|
/* Enabled thermal sensor after resume */
|
|
ret = thermal_zone_device_enable(data->tz);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static SIMPLE_DEV_PM_OPS(imx_thermal_pm_ops,
|
|
imx_thermal_suspend, imx_thermal_resume);
|
|
|
|
static struct platform_driver imx_thermal = {
|
|
.driver = {
|
|
.name = "imx_thermal",
|
|
.pm = &imx_thermal_pm_ops,
|
|
.of_match_table = of_imx_thermal_match,
|
|
},
|
|
.probe = imx_thermal_probe,
|
|
.remove = imx_thermal_remove,
|
|
};
|
|
module_platform_driver(imx_thermal);
|
|
|
|
MODULE_AUTHOR("Freescale Semiconductor, Inc.");
|
|
MODULE_DESCRIPTION("Thermal driver for Freescale i.MX SoCs");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_ALIAS("platform:imx-thermal");
|