afa58b49ac
The spinlock pkg_temp_lock has the potential of being taken in atomic context because it can be acquired from the thermal IRQ vector. It's static and limited scope so go ahead and make it a raw spinlock. Signed-off-by: Clark Williams <williams@redhat.com> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Zhang Rui <rui.zhang@intel.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Link: https://lore.kernel.org/r/20191008110021.2j44ayunal7fkb7i@linutronix.de
612 lines
14 KiB
C
612 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) STMicroelectronics 2018 - All Rights Reserved
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* Author: David Hernandez Sanchez <david.hernandezsanchez@st.com> for
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* STMicroelectronics.
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*/
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#include <linux/clk.h>
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#include <linux/clk-provider.h>
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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/iopoll.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_address.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/thermal.h>
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#include "../thermal_core.h"
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#include "../thermal_hwmon.h"
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/* DTS register offsets */
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#define DTS_CFGR1_OFFSET 0x0
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#define DTS_T0VALR1_OFFSET 0x8
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#define DTS_RAMPVALR_OFFSET 0X10
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#define DTS_ITR1_OFFSET 0x14
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#define DTS_DR_OFFSET 0x1C
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#define DTS_SR_OFFSET 0x20
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#define DTS_ITENR_OFFSET 0x24
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#define DTS_ICIFR_OFFSET 0x28
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/* DTS_CFGR1 register mask definitions */
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#define HSREF_CLK_DIV_MASK GENMASK(30, 24)
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#define TS1_SMP_TIME_MASK GENMASK(19, 16)
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#define TS1_INTRIG_SEL_MASK GENMASK(11, 8)
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/* DTS_T0VALR1 register mask definitions */
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#define TS1_T0_MASK GENMASK(17, 16)
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#define TS1_FMT0_MASK GENMASK(15, 0)
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/* DTS_RAMPVALR register mask definitions */
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#define TS1_RAMP_COEFF_MASK GENMASK(15, 0)
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/* DTS_ITR1 register mask definitions */
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#define TS1_HITTHD_MASK GENMASK(31, 16)
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#define TS1_LITTHD_MASK GENMASK(15, 0)
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/* DTS_DR register mask definitions */
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#define TS1_MFREQ_MASK GENMASK(15, 0)
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/* DTS_ITENR register mask definitions */
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#define ITENR_MASK (GENMASK(2, 0) | GENMASK(6, 4))
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/* DTS_ICIFR register mask definitions */
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#define ICIFR_MASK (GENMASK(2, 0) | GENMASK(6, 4))
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/* Less significant bit position definitions */
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#define TS1_T0_POS 16
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#define TS1_HITTHD_POS 16
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#define TS1_LITTHD_POS 0
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#define HSREF_CLK_DIV_POS 24
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/* DTS_CFGR1 bit definitions */
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#define TS1_EN BIT(0)
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#define TS1_START BIT(4)
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#define REFCLK_SEL BIT(20)
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#define REFCLK_LSE REFCLK_SEL
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#define Q_MEAS_OPT BIT(21)
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#define CALIBRATION_CONTROL Q_MEAS_OPT
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/* DTS_SR bit definitions */
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#define TS_RDY BIT(15)
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/* Bit definitions below are common for DTS_SR, DTS_ITENR and DTS_CIFR */
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#define HIGH_THRESHOLD BIT(2)
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#define LOW_THRESHOLD BIT(1)
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/* Constants */
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#define ADJUST 100
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#define ONE_MHZ 1000000
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#define POLL_TIMEOUT 5000
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#define STARTUP_TIME 40
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#define TS1_T0_VAL0 30000 /* 30 celsius */
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#define TS1_T0_VAL1 130000 /* 130 celsius */
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#define NO_HW_TRIG 0
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#define SAMPLING_TIME 15
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struct stm_thermal_sensor {
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struct device *dev;
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struct thermal_zone_device *th_dev;
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enum thermal_device_mode mode;
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struct clk *clk;
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unsigned int low_temp_enabled;
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unsigned int high_temp_enabled;
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int irq;
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void __iomem *base;
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int t0, fmt0, ramp_coeff;
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};
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static int stm_enable_irq(struct stm_thermal_sensor *sensor)
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{
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u32 value;
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dev_dbg(sensor->dev, "low:%d high:%d\n", sensor->low_temp_enabled,
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sensor->high_temp_enabled);
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/* Disable IT generation for low and high thresholds */
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value = readl_relaxed(sensor->base + DTS_ITENR_OFFSET);
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value &= ~(LOW_THRESHOLD | HIGH_THRESHOLD);
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if (sensor->low_temp_enabled)
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value |= HIGH_THRESHOLD;
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if (sensor->high_temp_enabled)
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value |= LOW_THRESHOLD;
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/* Enable interrupts */
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writel_relaxed(value, sensor->base + DTS_ITENR_OFFSET);
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return 0;
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}
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static irqreturn_t stm_thermal_irq_handler(int irq, void *sdata)
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{
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struct stm_thermal_sensor *sensor = sdata;
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dev_dbg(sensor->dev, "sr:%d\n",
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readl_relaxed(sensor->base + DTS_SR_OFFSET));
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thermal_zone_device_update(sensor->th_dev, THERMAL_EVENT_UNSPECIFIED);
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stm_enable_irq(sensor);
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/* Acknoledge all DTS irqs */
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writel_relaxed(ICIFR_MASK, sensor->base + DTS_ICIFR_OFFSET);
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return IRQ_HANDLED;
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}
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static int stm_sensor_power_on(struct stm_thermal_sensor *sensor)
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{
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int ret;
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u32 value;
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/* Enable sensor */
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value = readl_relaxed(sensor->base + DTS_CFGR1_OFFSET);
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value |= TS1_EN;
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writel_relaxed(value, sensor->base + DTS_CFGR1_OFFSET);
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/*
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* The DTS block can be enabled by setting TSx_EN bit in
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* DTS_CFGRx register. It requires a startup time of
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* 40μs. Use 5 ms as arbitrary timeout.
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*/
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ret = readl_poll_timeout(sensor->base + DTS_SR_OFFSET,
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value, (value & TS_RDY),
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STARTUP_TIME, POLL_TIMEOUT);
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if (ret)
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return ret;
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/* Start continuous measuring */
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value = readl_relaxed(sensor->base +
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DTS_CFGR1_OFFSET);
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value |= TS1_START;
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writel_relaxed(value, sensor->base +
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DTS_CFGR1_OFFSET);
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sensor->mode = THERMAL_DEVICE_ENABLED;
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return 0;
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}
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static int stm_sensor_power_off(struct stm_thermal_sensor *sensor)
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{
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u32 value;
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sensor->mode = THERMAL_DEVICE_DISABLED;
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/* Stop measuring */
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value = readl_relaxed(sensor->base + DTS_CFGR1_OFFSET);
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value &= ~TS1_START;
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writel_relaxed(value, sensor->base + DTS_CFGR1_OFFSET);
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/* Ensure stop is taken into account */
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usleep_range(STARTUP_TIME, POLL_TIMEOUT);
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/* Disable sensor */
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value = readl_relaxed(sensor->base + DTS_CFGR1_OFFSET);
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value &= ~TS1_EN;
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writel_relaxed(value, sensor->base + DTS_CFGR1_OFFSET);
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/* Ensure disable is taken into account */
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return readl_poll_timeout(sensor->base + DTS_SR_OFFSET, value,
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!(value & TS_RDY),
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STARTUP_TIME, POLL_TIMEOUT);
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}
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static int stm_thermal_calibration(struct stm_thermal_sensor *sensor)
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{
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u32 value, clk_freq;
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u32 prescaler;
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/* Figure out prescaler value for PCLK during calibration */
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clk_freq = clk_get_rate(sensor->clk);
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if (!clk_freq)
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return -EINVAL;
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prescaler = 0;
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clk_freq /= ONE_MHZ;
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if (clk_freq) {
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while (prescaler <= clk_freq)
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prescaler++;
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}
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value = readl_relaxed(sensor->base + DTS_CFGR1_OFFSET);
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/* Clear prescaler */
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value &= ~HSREF_CLK_DIV_MASK;
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/* Set prescaler. pclk_freq/prescaler < 1MHz */
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value |= (prescaler << HSREF_CLK_DIV_POS);
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/* Select PCLK as reference clock */
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value &= ~REFCLK_SEL;
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/* Set maximal sampling time for better precision */
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value |= TS1_SMP_TIME_MASK;
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/* Measure with calibration */
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value &= ~CALIBRATION_CONTROL;
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/* select trigger */
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value &= ~TS1_INTRIG_SEL_MASK;
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value |= NO_HW_TRIG;
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writel_relaxed(value, sensor->base + DTS_CFGR1_OFFSET);
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return 0;
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}
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/* Fill in DTS structure with factory sensor values */
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static int stm_thermal_read_factory_settings(struct stm_thermal_sensor *sensor)
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{
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/* Retrieve engineering calibration temperature */
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sensor->t0 = readl_relaxed(sensor->base + DTS_T0VALR1_OFFSET) &
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TS1_T0_MASK;
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if (!sensor->t0)
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sensor->t0 = TS1_T0_VAL0;
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else
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sensor->t0 = TS1_T0_VAL1;
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/* Retrieve fmt0 and put it on Hz */
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sensor->fmt0 = ADJUST * (readl_relaxed(sensor->base +
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DTS_T0VALR1_OFFSET) & TS1_FMT0_MASK);
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/* Retrieve ramp coefficient */
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sensor->ramp_coeff = readl_relaxed(sensor->base + DTS_RAMPVALR_OFFSET) &
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TS1_RAMP_COEFF_MASK;
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if (!sensor->fmt0 || !sensor->ramp_coeff) {
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dev_err(sensor->dev, "%s: wrong setting\n", __func__);
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return -EINVAL;
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}
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dev_dbg(sensor->dev, "%s: T0 = %doC, FMT0 = %dHz, RAMP_COEFF = %dHz/oC",
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__func__, sensor->t0, sensor->fmt0, sensor->ramp_coeff);
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return 0;
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}
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static int stm_thermal_calculate_threshold(struct stm_thermal_sensor *sensor,
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int temp, u32 *th)
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{
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int freqM;
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/* Figure out the CLK_PTAT frequency for a given temperature */
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freqM = ((temp - sensor->t0) * sensor->ramp_coeff) / 1000 +
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sensor->fmt0;
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/* Figure out the threshold sample number */
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*th = clk_get_rate(sensor->clk) * SAMPLING_TIME / freqM;
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if (!*th)
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return -EINVAL;
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dev_dbg(sensor->dev, "freqM=%d Hz, threshold=0x%x", freqM, *th);
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return 0;
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}
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/* Disable temperature interrupt */
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static int stm_disable_irq(struct stm_thermal_sensor *sensor)
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{
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u32 value;
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/* Disable IT generation */
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value = readl_relaxed(sensor->base + DTS_ITENR_OFFSET);
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value &= ~ITENR_MASK;
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writel_relaxed(value, sensor->base + DTS_ITENR_OFFSET);
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return 0;
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}
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static int stm_thermal_set_trips(void *data, int low, int high)
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{
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struct stm_thermal_sensor *sensor = data;
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u32 itr1, th;
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int ret;
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dev_dbg(sensor->dev, "set trips %d <--> %d\n", low, high);
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/* Erase threshold content */
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itr1 = readl_relaxed(sensor->base + DTS_ITR1_OFFSET);
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itr1 &= ~(TS1_LITTHD_MASK | TS1_HITTHD_MASK);
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/*
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* Disable low-temp if "low" is too small. As per thermal framework
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* API, we use -INT_MAX rather than INT_MIN.
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*/
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if (low > -INT_MAX) {
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sensor->low_temp_enabled = 1;
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/* add 0.5 of hysteresis due to measurement error */
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ret = stm_thermal_calculate_threshold(sensor, low - 500, &th);
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if (ret)
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return ret;
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itr1 |= (TS1_HITTHD_MASK & (th << TS1_HITTHD_POS));
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} else {
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sensor->low_temp_enabled = 0;
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}
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/* Disable high-temp if "high" is too big. */
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if (high < INT_MAX) {
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sensor->high_temp_enabled = 1;
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ret = stm_thermal_calculate_threshold(sensor, high, &th);
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if (ret)
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return ret;
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itr1 |= (TS1_LITTHD_MASK & (th << TS1_LITTHD_POS));
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} else {
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sensor->high_temp_enabled = 0;
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}
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/* Write new threshod values*/
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writel_relaxed(itr1, sensor->base + DTS_ITR1_OFFSET);
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return 0;
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}
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/* Callback to get temperature from HW */
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static int stm_thermal_get_temp(void *data, int *temp)
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{
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struct stm_thermal_sensor *sensor = data;
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u32 periods;
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int freqM, ret;
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if (sensor->mode != THERMAL_DEVICE_ENABLED)
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return -EAGAIN;
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/* Retrieve the number of periods sampled */
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ret = readl_relaxed_poll_timeout(sensor->base + DTS_DR_OFFSET, periods,
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(periods & TS1_MFREQ_MASK),
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STARTUP_TIME, POLL_TIMEOUT);
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if (ret)
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return ret;
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/* Figure out the CLK_PTAT frequency */
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freqM = (clk_get_rate(sensor->clk) * SAMPLING_TIME) / periods;
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if (!freqM)
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return -EINVAL;
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/* Figure out the temperature in mili celsius */
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*temp = (freqM - sensor->fmt0) * 1000 / sensor->ramp_coeff + sensor->t0;
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return 0;
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}
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/* Registers DTS irq to be visible by GIC */
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static int stm_register_irq(struct stm_thermal_sensor *sensor)
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{
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struct device *dev = sensor->dev;
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struct platform_device *pdev = to_platform_device(dev);
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int ret;
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sensor->irq = platform_get_irq(pdev, 0);
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if (sensor->irq < 0) {
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dev_err(dev, "%s: Unable to find IRQ\n", __func__);
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return sensor->irq;
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}
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ret = devm_request_threaded_irq(dev, sensor->irq,
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NULL,
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stm_thermal_irq_handler,
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IRQF_ONESHOT,
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dev->driver->name, sensor);
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if (ret) {
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dev_err(dev, "%s: Failed to register IRQ %d\n", __func__,
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sensor->irq);
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return ret;
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}
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dev_dbg(dev, "%s: thermal IRQ registered", __func__);
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return 0;
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}
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static int stm_thermal_sensor_off(struct stm_thermal_sensor *sensor)
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{
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int ret;
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stm_disable_irq(sensor);
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ret = stm_sensor_power_off(sensor);
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if (ret)
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return ret;
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clk_disable_unprepare(sensor->clk);
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return 0;
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}
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static int stm_thermal_prepare(struct stm_thermal_sensor *sensor)
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{
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int ret;
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ret = clk_prepare_enable(sensor->clk);
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if (ret)
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return ret;
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ret = stm_thermal_read_factory_settings(sensor);
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if (ret)
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goto thermal_unprepare;
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ret = stm_thermal_calibration(sensor);
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if (ret)
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goto thermal_unprepare;
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return 0;
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thermal_unprepare:
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clk_disable_unprepare(sensor->clk);
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return ret;
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}
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#ifdef CONFIG_PM_SLEEP
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static int stm_thermal_suspend(struct device *dev)
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{
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int ret;
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struct stm_thermal_sensor *sensor = dev_get_drvdata(dev);
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ret = stm_thermal_sensor_off(sensor);
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if (ret)
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return ret;
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return 0;
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}
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static int stm_thermal_resume(struct device *dev)
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{
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int ret;
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struct stm_thermal_sensor *sensor = dev_get_drvdata(dev);
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ret = stm_thermal_prepare(sensor);
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if (ret)
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return ret;
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ret = stm_sensor_power_on(sensor);
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if (ret)
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return ret;
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thermal_zone_device_update(sensor->th_dev, THERMAL_EVENT_UNSPECIFIED);
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stm_enable_irq(sensor);
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return 0;
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}
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#endif /* CONFIG_PM_SLEEP */
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static SIMPLE_DEV_PM_OPS(stm_thermal_pm_ops,
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stm_thermal_suspend, stm_thermal_resume);
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static const struct thermal_zone_of_device_ops stm_tz_ops = {
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.get_temp = stm_thermal_get_temp,
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.set_trips = stm_thermal_set_trips,
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};
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static const struct of_device_id stm_thermal_of_match[] = {
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{ .compatible = "st,stm32-thermal"},
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, stm_thermal_of_match);
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static int stm_thermal_probe(struct platform_device *pdev)
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{
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struct stm_thermal_sensor *sensor;
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struct resource *res;
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void __iomem *base;
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int ret;
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if (!pdev->dev.of_node) {
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dev_err(&pdev->dev, "%s: device tree node not found\n",
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__func__);
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return -EINVAL;
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}
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sensor = devm_kzalloc(&pdev->dev, sizeof(*sensor), GFP_KERNEL);
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if (!sensor)
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return -ENOMEM;
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platform_set_drvdata(pdev, sensor);
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sensor->dev = &pdev->dev;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
base = devm_ioremap_resource(&pdev->dev, res);
|
|
if (IS_ERR(base))
|
|
return PTR_ERR(base);
|
|
|
|
/* Populate sensor */
|
|
sensor->base = base;
|
|
|
|
sensor->clk = devm_clk_get(&pdev->dev, "pclk");
|
|
if (IS_ERR(sensor->clk)) {
|
|
dev_err(&pdev->dev, "%s: failed to fetch PCLK clock\n",
|
|
__func__);
|
|
return PTR_ERR(sensor->clk);
|
|
}
|
|
|
|
stm_disable_irq(sensor);
|
|
|
|
/* Clear irq flags */
|
|
writel_relaxed(ICIFR_MASK, sensor->base + DTS_ICIFR_OFFSET);
|
|
|
|
/* Configure and enable HW sensor */
|
|
ret = stm_thermal_prepare(sensor);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "Error prepare sensor: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = stm_sensor_power_on(sensor);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "Error power on sensor: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
sensor->th_dev = devm_thermal_zone_of_sensor_register(&pdev->dev, 0,
|
|
sensor,
|
|
&stm_tz_ops);
|
|
|
|
if (IS_ERR(sensor->th_dev)) {
|
|
dev_err(&pdev->dev, "%s: thermal zone sensor registering KO\n",
|
|
__func__);
|
|
ret = PTR_ERR(sensor->th_dev);
|
|
return ret;
|
|
}
|
|
|
|
/* Register IRQ into GIC */
|
|
ret = stm_register_irq(sensor);
|
|
if (ret)
|
|
goto err_tz;
|
|
|
|
stm_enable_irq(sensor);
|
|
|
|
/*
|
|
* Thermal_zone doesn't enable hwmon as default,
|
|
* enable it here
|
|
*/
|
|
sensor->th_dev->tzp->no_hwmon = false;
|
|
ret = thermal_add_hwmon_sysfs(sensor->th_dev);
|
|
if (ret)
|
|
goto err_tz;
|
|
|
|
dev_info(&pdev->dev, "%s: Driver initialized successfully\n",
|
|
__func__);
|
|
|
|
return 0;
|
|
|
|
err_tz:
|
|
thermal_zone_of_sensor_unregister(&pdev->dev, sensor->th_dev);
|
|
return ret;
|
|
}
|
|
|
|
static int stm_thermal_remove(struct platform_device *pdev)
|
|
{
|
|
struct stm_thermal_sensor *sensor = platform_get_drvdata(pdev);
|
|
|
|
stm_thermal_sensor_off(sensor);
|
|
thermal_remove_hwmon_sysfs(sensor->th_dev);
|
|
thermal_zone_of_sensor_unregister(&pdev->dev, sensor->th_dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver stm_thermal_driver = {
|
|
.driver = {
|
|
.name = "stm_thermal",
|
|
.pm = &stm_thermal_pm_ops,
|
|
.of_match_table = stm_thermal_of_match,
|
|
},
|
|
.probe = stm_thermal_probe,
|
|
.remove = stm_thermal_remove,
|
|
};
|
|
module_platform_driver(stm_thermal_driver);
|
|
|
|
MODULE_DESCRIPTION("STMicroelectronics STM32 Thermal Sensor Driver");
|
|
MODULE_AUTHOR("David Hernandez Sanchez <david.hernandezsanchez@st.com>");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_ALIAS("platform:stm_thermal");
|