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![Ansuel Smith](/assets/img/avatar_default.png)
The function can loop and lock the system if for whatever reason the bit for the target sensor is NEVER valid. This is the case if a sensor is disabled by the factory and the valid bit is never reported as actually valid. Add a timeout check and exit if a timeout occurs. As this is a very rare condition, handle the timeout only if the first read fails. While at it also rework the function to improve readability and convert to poll_timeout generic macro. Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Link: https://lore.kernel.org/r/20211007172859.583-1-ansuelsmth@gmail.com Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
1188 lines
30 KiB
C
1188 lines
30 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2015, The Linux Foundation. All rights reserved.
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* Copyright (c) 2019, 2020, Linaro Ltd.
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*/
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#include <linux/debugfs.h>
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#include <linux/err.h>
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#include <linux/io.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.h>
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#include <linux/of_address.h>
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#include <linux/of_platform.h>
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#include <linux/mfd/syscon.h>
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#include <linux/platform_device.h>
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#include <linux/pm.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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#include <linux/thermal.h>
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#include "tsens.h"
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/**
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* struct tsens_irq_data - IRQ status and temperature violations
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* @up_viol: upper threshold violated
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* @up_thresh: upper threshold temperature value
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* @up_irq_mask: mask register for upper threshold irqs
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* @up_irq_clear: clear register for uppper threshold irqs
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* @low_viol: lower threshold violated
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* @low_thresh: lower threshold temperature value
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* @low_irq_mask: mask register for lower threshold irqs
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* @low_irq_clear: clear register for lower threshold irqs
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* @crit_viol: critical threshold violated
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* @crit_thresh: critical threshold temperature value
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* @crit_irq_mask: mask register for critical threshold irqs
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* @crit_irq_clear: clear register for critical threshold irqs
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*
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* Structure containing data about temperature threshold settings and
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* irq status if they were violated.
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*/
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struct tsens_irq_data {
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u32 up_viol;
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int up_thresh;
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u32 up_irq_mask;
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u32 up_irq_clear;
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u32 low_viol;
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int low_thresh;
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u32 low_irq_mask;
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u32 low_irq_clear;
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u32 crit_viol;
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u32 crit_thresh;
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u32 crit_irq_mask;
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u32 crit_irq_clear;
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};
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char *qfprom_read(struct device *dev, const char *cname)
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{
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struct nvmem_cell *cell;
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ssize_t data;
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char *ret;
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cell = nvmem_cell_get(dev, cname);
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if (IS_ERR(cell))
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return ERR_CAST(cell);
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ret = nvmem_cell_read(cell, &data);
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nvmem_cell_put(cell);
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return ret;
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}
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/*
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* Use this function on devices where slope and offset calculations
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* depend on calibration data read from qfprom. On others the slope
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* and offset values are derived from tz->tzp->slope and tz->tzp->offset
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* resp.
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*/
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void compute_intercept_slope(struct tsens_priv *priv, u32 *p1,
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u32 *p2, u32 mode)
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{
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int i;
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int num, den;
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for (i = 0; i < priv->num_sensors; i++) {
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dev_dbg(priv->dev,
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"%s: sensor%d - data_point1:%#x data_point2:%#x\n",
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__func__, i, p1[i], p2[i]);
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if (!priv->sensor[i].slope)
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priv->sensor[i].slope = SLOPE_DEFAULT;
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if (mode == TWO_PT_CALIB) {
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/*
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* slope (m) = adc_code2 - adc_code1 (y2 - y1)/
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* temp_120_degc - temp_30_degc (x2 - x1)
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*/
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num = p2[i] - p1[i];
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num *= SLOPE_FACTOR;
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den = CAL_DEGC_PT2 - CAL_DEGC_PT1;
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priv->sensor[i].slope = num / den;
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}
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priv->sensor[i].offset = (p1[i] * SLOPE_FACTOR) -
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(CAL_DEGC_PT1 *
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priv->sensor[i].slope);
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dev_dbg(priv->dev, "%s: offset:%d\n", __func__,
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priv->sensor[i].offset);
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}
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}
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static inline u32 degc_to_code(int degc, const struct tsens_sensor *s)
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{
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u64 code = div_u64(((u64)degc * s->slope + s->offset), SLOPE_FACTOR);
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pr_debug("%s: raw_code: 0x%llx, degc:%d\n", __func__, code, degc);
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return clamp_val(code, THRESHOLD_MIN_ADC_CODE, THRESHOLD_MAX_ADC_CODE);
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}
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static inline int code_to_degc(u32 adc_code, const struct tsens_sensor *s)
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{
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int degc, num, den;
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num = (adc_code * SLOPE_FACTOR) - s->offset;
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den = s->slope;
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if (num > 0)
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degc = num + (den / 2);
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else if (num < 0)
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degc = num - (den / 2);
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else
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degc = num;
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degc /= den;
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return degc;
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}
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/**
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* tsens_hw_to_mC - Return sign-extended temperature in mCelsius.
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* @s: Pointer to sensor struct
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* @field: Index into regmap_field array pointing to temperature data
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*
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* This function handles temperature returned in ADC code or deciCelsius
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* depending on IP version.
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*
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* Return: Temperature in milliCelsius on success, a negative errno will
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* be returned in error cases
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*/
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static int tsens_hw_to_mC(const struct tsens_sensor *s, int field)
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{
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struct tsens_priv *priv = s->priv;
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u32 resolution;
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u32 temp = 0;
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int ret;
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resolution = priv->fields[LAST_TEMP_0].msb -
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priv->fields[LAST_TEMP_0].lsb;
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ret = regmap_field_read(priv->rf[field], &temp);
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if (ret)
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return ret;
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/* Convert temperature from ADC code to milliCelsius */
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if (priv->feat->adc)
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return code_to_degc(temp, s) * 1000;
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/* deciCelsius -> milliCelsius along with sign extension */
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return sign_extend32(temp, resolution) * 100;
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}
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/**
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* tsens_mC_to_hw - Convert temperature to hardware register value
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* @s: Pointer to sensor struct
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* @temp: temperature in milliCelsius to be programmed to hardware
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*
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* This function outputs the value to be written to hardware in ADC code
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* or deciCelsius depending on IP version.
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*
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* Return: ADC code or temperature in deciCelsius.
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*/
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static int tsens_mC_to_hw(const struct tsens_sensor *s, int temp)
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{
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struct tsens_priv *priv = s->priv;
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/* milliC to adc code */
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if (priv->feat->adc)
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return degc_to_code(temp / 1000, s);
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/* milliC to deciC */
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return temp / 100;
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}
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static inline enum tsens_ver tsens_version(struct tsens_priv *priv)
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{
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return priv->feat->ver_major;
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}
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static void tsens_set_interrupt_v1(struct tsens_priv *priv, u32 hw_id,
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enum tsens_irq_type irq_type, bool enable)
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{
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u32 index = 0;
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switch (irq_type) {
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case UPPER:
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index = UP_INT_CLEAR_0 + hw_id;
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break;
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case LOWER:
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index = LOW_INT_CLEAR_0 + hw_id;
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break;
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case CRITICAL:
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/* No critical interrupts before v2 */
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return;
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}
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regmap_field_write(priv->rf[index], enable ? 0 : 1);
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}
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static void tsens_set_interrupt_v2(struct tsens_priv *priv, u32 hw_id,
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enum tsens_irq_type irq_type, bool enable)
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{
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u32 index_mask = 0, index_clear = 0;
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/*
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* To enable the interrupt flag for a sensor:
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* - clear the mask bit
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* To disable the interrupt flag for a sensor:
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* - Mask further interrupts for this sensor
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* - Write 1 followed by 0 to clear the interrupt
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*/
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switch (irq_type) {
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case UPPER:
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index_mask = UP_INT_MASK_0 + hw_id;
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index_clear = UP_INT_CLEAR_0 + hw_id;
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break;
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case LOWER:
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index_mask = LOW_INT_MASK_0 + hw_id;
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index_clear = LOW_INT_CLEAR_0 + hw_id;
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break;
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case CRITICAL:
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index_mask = CRIT_INT_MASK_0 + hw_id;
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index_clear = CRIT_INT_CLEAR_0 + hw_id;
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break;
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}
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if (enable) {
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regmap_field_write(priv->rf[index_mask], 0);
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} else {
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regmap_field_write(priv->rf[index_mask], 1);
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regmap_field_write(priv->rf[index_clear], 1);
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regmap_field_write(priv->rf[index_clear], 0);
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}
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}
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/**
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* tsens_set_interrupt - Set state of an interrupt
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* @priv: Pointer to tsens controller private data
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* @hw_id: Hardware ID aka. sensor number
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* @irq_type: irq_type from enum tsens_irq_type
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* @enable: false = disable, true = enable
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*
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* Call IP-specific function to set state of an interrupt
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*
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* Return: void
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*/
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static void tsens_set_interrupt(struct tsens_priv *priv, u32 hw_id,
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enum tsens_irq_type irq_type, bool enable)
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{
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dev_dbg(priv->dev, "[%u] %s: %s -> %s\n", hw_id, __func__,
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irq_type ? ((irq_type == 1) ? "UP" : "CRITICAL") : "LOW",
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enable ? "en" : "dis");
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if (tsens_version(priv) > VER_1_X)
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tsens_set_interrupt_v2(priv, hw_id, irq_type, enable);
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else
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tsens_set_interrupt_v1(priv, hw_id, irq_type, enable);
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}
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/**
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* tsens_threshold_violated - Check if a sensor temperature violated a preset threshold
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* @priv: Pointer to tsens controller private data
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* @hw_id: Hardware ID aka. sensor number
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* @d: Pointer to irq state data
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*
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* Return: 0 if threshold was not violated, 1 if it was violated and negative
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* errno in case of errors
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*/
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static int tsens_threshold_violated(struct tsens_priv *priv, u32 hw_id,
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struct tsens_irq_data *d)
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{
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int ret;
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ret = regmap_field_read(priv->rf[UPPER_STATUS_0 + hw_id], &d->up_viol);
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if (ret)
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return ret;
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ret = regmap_field_read(priv->rf[LOWER_STATUS_0 + hw_id], &d->low_viol);
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if (ret)
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return ret;
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if (priv->feat->crit_int) {
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ret = regmap_field_read(priv->rf[CRITICAL_STATUS_0 + hw_id],
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&d->crit_viol);
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if (ret)
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return ret;
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}
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if (d->up_viol || d->low_viol || d->crit_viol)
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return 1;
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return 0;
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}
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static int tsens_read_irq_state(struct tsens_priv *priv, u32 hw_id,
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const struct tsens_sensor *s,
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struct tsens_irq_data *d)
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{
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int ret;
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ret = regmap_field_read(priv->rf[UP_INT_CLEAR_0 + hw_id], &d->up_irq_clear);
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if (ret)
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return ret;
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ret = regmap_field_read(priv->rf[LOW_INT_CLEAR_0 + hw_id], &d->low_irq_clear);
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if (ret)
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return ret;
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if (tsens_version(priv) > VER_1_X) {
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ret = regmap_field_read(priv->rf[UP_INT_MASK_0 + hw_id], &d->up_irq_mask);
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if (ret)
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return ret;
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ret = regmap_field_read(priv->rf[LOW_INT_MASK_0 + hw_id], &d->low_irq_mask);
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if (ret)
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return ret;
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ret = regmap_field_read(priv->rf[CRIT_INT_CLEAR_0 + hw_id],
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&d->crit_irq_clear);
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if (ret)
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return ret;
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ret = regmap_field_read(priv->rf[CRIT_INT_MASK_0 + hw_id],
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&d->crit_irq_mask);
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if (ret)
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return ret;
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d->crit_thresh = tsens_hw_to_mC(s, CRIT_THRESH_0 + hw_id);
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} else {
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/* No mask register on older TSENS */
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d->up_irq_mask = 0;
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d->low_irq_mask = 0;
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d->crit_irq_clear = 0;
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d->crit_irq_mask = 0;
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d->crit_thresh = 0;
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}
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d->up_thresh = tsens_hw_to_mC(s, UP_THRESH_0 + hw_id);
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d->low_thresh = tsens_hw_to_mC(s, LOW_THRESH_0 + hw_id);
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dev_dbg(priv->dev, "[%u] %s%s: status(%u|%u|%u) | clr(%u|%u|%u) | mask(%u|%u|%u)\n",
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hw_id, __func__,
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(d->up_viol || d->low_viol || d->crit_viol) ? "(V)" : "",
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d->low_viol, d->up_viol, d->crit_viol,
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d->low_irq_clear, d->up_irq_clear, d->crit_irq_clear,
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d->low_irq_mask, d->up_irq_mask, d->crit_irq_mask);
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dev_dbg(priv->dev, "[%u] %s%s: thresh: (%d:%d:%d)\n", hw_id, __func__,
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(d->up_viol || d->low_viol || d->crit_viol) ? "(V)" : "",
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d->low_thresh, d->up_thresh, d->crit_thresh);
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return 0;
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}
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static inline u32 masked_irq(u32 hw_id, u32 mask, enum tsens_ver ver)
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{
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if (ver > VER_1_X)
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return mask & (1 << hw_id);
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/* v1, v0.1 don't have a irq mask register */
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return 0;
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}
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/**
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* tsens_critical_irq_thread() - Threaded handler for critical interrupts
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* @irq: irq number
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* @data: tsens controller private data
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*
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* Check FSM watchdog bark status and clear if needed.
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* Check all sensors to find ones that violated their critical threshold limits.
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* Clear and then re-enable the interrupt.
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*
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* The level-triggered interrupt might deassert if the temperature returned to
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* within the threshold limits by the time the handler got scheduled. We
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* consider the irq to have been handled in that case.
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*
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* Return: IRQ_HANDLED
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*/
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static irqreturn_t tsens_critical_irq_thread(int irq, void *data)
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{
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struct tsens_priv *priv = data;
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struct tsens_irq_data d;
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int temp, ret, i;
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u32 wdog_status, wdog_count;
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if (priv->feat->has_watchdog) {
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ret = regmap_field_read(priv->rf[WDOG_BARK_STATUS],
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&wdog_status);
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if (ret)
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return ret;
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if (wdog_status) {
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/* Clear WDOG interrupt */
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regmap_field_write(priv->rf[WDOG_BARK_CLEAR], 1);
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regmap_field_write(priv->rf[WDOG_BARK_CLEAR], 0);
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ret = regmap_field_read(priv->rf[WDOG_BARK_COUNT],
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&wdog_count);
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if (ret)
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return ret;
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if (wdog_count)
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dev_dbg(priv->dev, "%s: watchdog count: %d\n",
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__func__, wdog_count);
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/* Fall through to handle critical interrupts if any */
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}
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}
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for (i = 0; i < priv->num_sensors; i++) {
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const struct tsens_sensor *s = &priv->sensor[i];
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u32 hw_id = s->hw_id;
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if (!s->tzd)
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continue;
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if (!tsens_threshold_violated(priv, hw_id, &d))
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continue;
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ret = get_temp_tsens_valid(s, &temp);
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if (ret) {
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dev_err(priv->dev, "[%u] %s: error reading sensor\n",
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hw_id, __func__);
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continue;
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}
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tsens_read_irq_state(priv, hw_id, s, &d);
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if (d.crit_viol &&
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!masked_irq(hw_id, d.crit_irq_mask, tsens_version(priv))) {
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/* Mask critical interrupts, unused on Linux */
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tsens_set_interrupt(priv, hw_id, CRITICAL, false);
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}
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}
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return IRQ_HANDLED;
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}
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/**
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* tsens_irq_thread - Threaded interrupt handler for uplow interrupts
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* @irq: irq number
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* @data: tsens controller private data
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*
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* Check all sensors to find ones that violated their threshold limits. If the
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* temperature is still outside the limits, call thermal_zone_device_update() to
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* update the thresholds, else re-enable the interrupts.
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*
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* The level-triggered interrupt might deassert if the temperature returned to
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* within the threshold limits by the time the handler got scheduled. We
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* consider the irq to have been handled in that case.
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*
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* Return: IRQ_HANDLED
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*/
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static irqreturn_t tsens_irq_thread(int irq, void *data)
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{
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struct tsens_priv *priv = data;
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struct tsens_irq_data d;
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bool enable = true, disable = false;
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unsigned long flags;
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int temp, ret, i;
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for (i = 0; i < priv->num_sensors; i++) {
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bool trigger = false;
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const struct tsens_sensor *s = &priv->sensor[i];
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u32 hw_id = s->hw_id;
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if (!s->tzd)
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continue;
|
|
if (!tsens_threshold_violated(priv, hw_id, &d))
|
|
continue;
|
|
ret = get_temp_tsens_valid(s, &temp);
|
|
if (ret) {
|
|
dev_err(priv->dev, "[%u] %s: error reading sensor\n",
|
|
hw_id, __func__);
|
|
continue;
|
|
}
|
|
|
|
spin_lock_irqsave(&priv->ul_lock, flags);
|
|
|
|
tsens_read_irq_state(priv, hw_id, s, &d);
|
|
|
|
if (d.up_viol &&
|
|
!masked_irq(hw_id, d.up_irq_mask, tsens_version(priv))) {
|
|
tsens_set_interrupt(priv, hw_id, UPPER, disable);
|
|
if (d.up_thresh > temp) {
|
|
dev_dbg(priv->dev, "[%u] %s: re-arm upper\n",
|
|
hw_id, __func__);
|
|
tsens_set_interrupt(priv, hw_id, UPPER, enable);
|
|
} else {
|
|
trigger = true;
|
|
/* Keep irq masked */
|
|
}
|
|
} else if (d.low_viol &&
|
|
!masked_irq(hw_id, d.low_irq_mask, tsens_version(priv))) {
|
|
tsens_set_interrupt(priv, hw_id, LOWER, disable);
|
|
if (d.low_thresh < temp) {
|
|
dev_dbg(priv->dev, "[%u] %s: re-arm low\n",
|
|
hw_id, __func__);
|
|
tsens_set_interrupt(priv, hw_id, LOWER, enable);
|
|
} else {
|
|
trigger = true;
|
|
/* Keep irq masked */
|
|
}
|
|
}
|
|
|
|
spin_unlock_irqrestore(&priv->ul_lock, flags);
|
|
|
|
if (trigger) {
|
|
dev_dbg(priv->dev, "[%u] %s: TZ update trigger (%d mC)\n",
|
|
hw_id, __func__, temp);
|
|
thermal_zone_device_update(s->tzd,
|
|
THERMAL_EVENT_UNSPECIFIED);
|
|
} else {
|
|
dev_dbg(priv->dev, "[%u] %s: no violation: %d\n",
|
|
hw_id, __func__, temp);
|
|
}
|
|
|
|
if (tsens_version(priv) < VER_0_1) {
|
|
/* Constraint: There is only 1 interrupt control register for all
|
|
* 11 temperature sensor. So monitoring more than 1 sensor based
|
|
* on interrupts will yield inconsistent result. To overcome this
|
|
* issue we will monitor only sensor 0 which is the master sensor.
|
|
*/
|
|
break;
|
|
}
|
|
}
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int tsens_set_trips(void *_sensor, int low, int high)
|
|
{
|
|
struct tsens_sensor *s = _sensor;
|
|
struct tsens_priv *priv = s->priv;
|
|
struct device *dev = priv->dev;
|
|
struct tsens_irq_data d;
|
|
unsigned long flags;
|
|
int high_val, low_val, cl_high, cl_low;
|
|
u32 hw_id = s->hw_id;
|
|
|
|
if (tsens_version(priv) < VER_0_1) {
|
|
/* Pre v0.1 IP had a single register for each type of interrupt
|
|
* and thresholds
|
|
*/
|
|
hw_id = 0;
|
|
}
|
|
|
|
dev_dbg(dev, "[%u] %s: proposed thresholds: (%d:%d)\n",
|
|
hw_id, __func__, low, high);
|
|
|
|
cl_high = clamp_val(high, -40000, 120000);
|
|
cl_low = clamp_val(low, -40000, 120000);
|
|
|
|
high_val = tsens_mC_to_hw(s, cl_high);
|
|
low_val = tsens_mC_to_hw(s, cl_low);
|
|
|
|
spin_lock_irqsave(&priv->ul_lock, flags);
|
|
|
|
tsens_read_irq_state(priv, hw_id, s, &d);
|
|
|
|
/* Write the new thresholds and clear the status */
|
|
regmap_field_write(priv->rf[LOW_THRESH_0 + hw_id], low_val);
|
|
regmap_field_write(priv->rf[UP_THRESH_0 + hw_id], high_val);
|
|
tsens_set_interrupt(priv, hw_id, LOWER, true);
|
|
tsens_set_interrupt(priv, hw_id, UPPER, true);
|
|
|
|
spin_unlock_irqrestore(&priv->ul_lock, flags);
|
|
|
|
dev_dbg(dev, "[%u] %s: (%d:%d)->(%d:%d)\n",
|
|
hw_id, __func__, d.low_thresh, d.up_thresh, cl_low, cl_high);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tsens_enable_irq(struct tsens_priv *priv)
|
|
{
|
|
int ret;
|
|
int val = tsens_version(priv) > VER_1_X ? 7 : 1;
|
|
|
|
ret = regmap_field_write(priv->rf[INT_EN], val);
|
|
if (ret < 0)
|
|
dev_err(priv->dev, "%s: failed to enable interrupts\n",
|
|
__func__);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void tsens_disable_irq(struct tsens_priv *priv)
|
|
{
|
|
regmap_field_write(priv->rf[INT_EN], 0);
|
|
}
|
|
|
|
int get_temp_tsens_valid(const struct tsens_sensor *s, int *temp)
|
|
{
|
|
struct tsens_priv *priv = s->priv;
|
|
int hw_id = s->hw_id;
|
|
u32 temp_idx = LAST_TEMP_0 + hw_id;
|
|
u32 valid_idx = VALID_0 + hw_id;
|
|
u32 valid;
|
|
int ret;
|
|
|
|
/* VER_0 doesn't have VALID bit */
|
|
if (tsens_version(priv) == VER_0)
|
|
goto get_temp;
|
|
|
|
/* Valid bit is 0 for 6 AHB clock cycles.
|
|
* At 19.2MHz, 1 AHB clock is ~60ns.
|
|
* We should enter this loop very, very rarely.
|
|
* Wait 1 us since it's the min of poll_timeout macro.
|
|
* Old value was 400 ns.
|
|
*/
|
|
ret = regmap_field_read_poll_timeout(priv->rf[valid_idx], valid,
|
|
valid, 1, 20 * USEC_PER_MSEC);
|
|
if (ret)
|
|
return ret;
|
|
|
|
get_temp:
|
|
/* Valid bit is set, OK to read the temperature */
|
|
*temp = tsens_hw_to_mC(s, temp_idx);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int get_temp_common(const struct tsens_sensor *s, int *temp)
|
|
{
|
|
struct tsens_priv *priv = s->priv;
|
|
int hw_id = s->hw_id;
|
|
int last_temp = 0, ret, trdy;
|
|
unsigned long timeout;
|
|
|
|
timeout = jiffies + usecs_to_jiffies(TIMEOUT_US);
|
|
do {
|
|
if (tsens_version(priv) == VER_0) {
|
|
ret = regmap_field_read(priv->rf[TRDY], &trdy);
|
|
if (ret)
|
|
return ret;
|
|
if (!trdy)
|
|
continue;
|
|
}
|
|
|
|
ret = regmap_field_read(priv->rf[LAST_TEMP_0 + hw_id], &last_temp);
|
|
if (ret)
|
|
return ret;
|
|
|
|
*temp = code_to_degc(last_temp, s) * 1000;
|
|
|
|
return 0;
|
|
} while (time_before(jiffies, timeout));
|
|
|
|
return -ETIMEDOUT;
|
|
}
|
|
|
|
#ifdef CONFIG_DEBUG_FS
|
|
static int dbg_sensors_show(struct seq_file *s, void *data)
|
|
{
|
|
struct platform_device *pdev = s->private;
|
|
struct tsens_priv *priv = platform_get_drvdata(pdev);
|
|
int i;
|
|
|
|
seq_printf(s, "max: %2d\nnum: %2d\n\n",
|
|
priv->feat->max_sensors, priv->num_sensors);
|
|
|
|
seq_puts(s, " id slope offset\n--------------------------\n");
|
|
for (i = 0; i < priv->num_sensors; i++) {
|
|
seq_printf(s, "%8d %8d %8d\n", priv->sensor[i].hw_id,
|
|
priv->sensor[i].slope, priv->sensor[i].offset);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int dbg_version_show(struct seq_file *s, void *data)
|
|
{
|
|
struct platform_device *pdev = s->private;
|
|
struct tsens_priv *priv = platform_get_drvdata(pdev);
|
|
u32 maj_ver, min_ver, step_ver;
|
|
int ret;
|
|
|
|
if (tsens_version(priv) > VER_0_1) {
|
|
ret = regmap_field_read(priv->rf[VER_MAJOR], &maj_ver);
|
|
if (ret)
|
|
return ret;
|
|
ret = regmap_field_read(priv->rf[VER_MINOR], &min_ver);
|
|
if (ret)
|
|
return ret;
|
|
ret = regmap_field_read(priv->rf[VER_STEP], &step_ver);
|
|
if (ret)
|
|
return ret;
|
|
seq_printf(s, "%d.%d.%d\n", maj_ver, min_ver, step_ver);
|
|
} else {
|
|
seq_puts(s, "0.1.0\n");
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
DEFINE_SHOW_ATTRIBUTE(dbg_version);
|
|
DEFINE_SHOW_ATTRIBUTE(dbg_sensors);
|
|
|
|
static void tsens_debug_init(struct platform_device *pdev)
|
|
{
|
|
struct tsens_priv *priv = platform_get_drvdata(pdev);
|
|
struct dentry *root, *file;
|
|
|
|
root = debugfs_lookup("tsens", NULL);
|
|
if (!root)
|
|
priv->debug_root = debugfs_create_dir("tsens", NULL);
|
|
else
|
|
priv->debug_root = root;
|
|
|
|
file = debugfs_lookup("version", priv->debug_root);
|
|
if (!file)
|
|
debugfs_create_file("version", 0444, priv->debug_root,
|
|
pdev, &dbg_version_fops);
|
|
|
|
/* A directory for each instance of the TSENS IP */
|
|
priv->debug = debugfs_create_dir(dev_name(&pdev->dev), priv->debug_root);
|
|
debugfs_create_file("sensors", 0444, priv->debug, pdev, &dbg_sensors_fops);
|
|
}
|
|
#else
|
|
static inline void tsens_debug_init(struct platform_device *pdev) {}
|
|
#endif
|
|
|
|
static const struct regmap_config tsens_config = {
|
|
.name = "tm",
|
|
.reg_bits = 32,
|
|
.val_bits = 32,
|
|
.reg_stride = 4,
|
|
};
|
|
|
|
static const struct regmap_config tsens_srot_config = {
|
|
.name = "srot",
|
|
.reg_bits = 32,
|
|
.val_bits = 32,
|
|
.reg_stride = 4,
|
|
};
|
|
|
|
int __init init_common(struct tsens_priv *priv)
|
|
{
|
|
void __iomem *tm_base, *srot_base;
|
|
struct device *dev = priv->dev;
|
|
u32 ver_minor;
|
|
struct resource *res;
|
|
u32 enabled;
|
|
int ret, i, j;
|
|
struct platform_device *op = of_find_device_by_node(priv->dev->of_node);
|
|
|
|
if (!op)
|
|
return -EINVAL;
|
|
|
|
if (op->num_resources > 1) {
|
|
/* DT with separate SROT and TM address space */
|
|
priv->tm_offset = 0;
|
|
res = platform_get_resource(op, IORESOURCE_MEM, 1);
|
|
srot_base = devm_ioremap_resource(dev, res);
|
|
if (IS_ERR(srot_base)) {
|
|
ret = PTR_ERR(srot_base);
|
|
goto err_put_device;
|
|
}
|
|
|
|
priv->srot_map = devm_regmap_init_mmio(dev, srot_base,
|
|
&tsens_srot_config);
|
|
if (IS_ERR(priv->srot_map)) {
|
|
ret = PTR_ERR(priv->srot_map);
|
|
goto err_put_device;
|
|
}
|
|
} else {
|
|
/* old DTs where SROT and TM were in a contiguous 2K block */
|
|
priv->tm_offset = 0x1000;
|
|
}
|
|
|
|
if (tsens_version(priv) >= VER_0_1) {
|
|
res = platform_get_resource(op, IORESOURCE_MEM, 0);
|
|
tm_base = devm_ioremap_resource(dev, res);
|
|
if (IS_ERR(tm_base)) {
|
|
ret = PTR_ERR(tm_base);
|
|
goto err_put_device;
|
|
}
|
|
|
|
priv->tm_map = devm_regmap_init_mmio(dev, tm_base, &tsens_config);
|
|
} else { /* VER_0 share the same gcc regs using a syscon */
|
|
struct device *parent = priv->dev->parent;
|
|
|
|
if (parent)
|
|
priv->tm_map = syscon_node_to_regmap(parent->of_node);
|
|
}
|
|
|
|
if (IS_ERR_OR_NULL(priv->tm_map)) {
|
|
if (!priv->tm_map)
|
|
ret = -ENODEV;
|
|
else
|
|
ret = PTR_ERR(priv->tm_map);
|
|
goto err_put_device;
|
|
}
|
|
|
|
/* VER_0 have only tm_map */
|
|
if (!priv->srot_map)
|
|
priv->srot_map = priv->tm_map;
|
|
|
|
if (tsens_version(priv) > VER_0_1) {
|
|
for (i = VER_MAJOR; i <= VER_STEP; i++) {
|
|
priv->rf[i] = devm_regmap_field_alloc(dev, priv->srot_map,
|
|
priv->fields[i]);
|
|
if (IS_ERR(priv->rf[i])) {
|
|
ret = PTR_ERR(priv->rf[i]);
|
|
goto err_put_device;
|
|
}
|
|
}
|
|
ret = regmap_field_read(priv->rf[VER_MINOR], &ver_minor);
|
|
if (ret)
|
|
goto err_put_device;
|
|
}
|
|
|
|
priv->rf[TSENS_EN] = devm_regmap_field_alloc(dev, priv->srot_map,
|
|
priv->fields[TSENS_EN]);
|
|
if (IS_ERR(priv->rf[TSENS_EN])) {
|
|
ret = PTR_ERR(priv->rf[TSENS_EN]);
|
|
goto err_put_device;
|
|
}
|
|
/* in VER_0 TSENS need to be explicitly enabled */
|
|
if (tsens_version(priv) == VER_0)
|
|
regmap_field_write(priv->rf[TSENS_EN], 1);
|
|
|
|
ret = regmap_field_read(priv->rf[TSENS_EN], &enabled);
|
|
if (ret)
|
|
goto err_put_device;
|
|
if (!enabled) {
|
|
dev_err(dev, "%s: device not enabled\n", __func__);
|
|
ret = -ENODEV;
|
|
goto err_put_device;
|
|
}
|
|
|
|
priv->rf[SENSOR_EN] = devm_regmap_field_alloc(dev, priv->srot_map,
|
|
priv->fields[SENSOR_EN]);
|
|
if (IS_ERR(priv->rf[SENSOR_EN])) {
|
|
ret = PTR_ERR(priv->rf[SENSOR_EN]);
|
|
goto err_put_device;
|
|
}
|
|
priv->rf[INT_EN] = devm_regmap_field_alloc(dev, priv->tm_map,
|
|
priv->fields[INT_EN]);
|
|
if (IS_ERR(priv->rf[INT_EN])) {
|
|
ret = PTR_ERR(priv->rf[INT_EN]);
|
|
goto err_put_device;
|
|
}
|
|
|
|
priv->rf[TSENS_SW_RST] =
|
|
devm_regmap_field_alloc(dev, priv->srot_map, priv->fields[TSENS_SW_RST]);
|
|
if (IS_ERR(priv->rf[TSENS_SW_RST])) {
|
|
ret = PTR_ERR(priv->rf[TSENS_SW_RST]);
|
|
goto err_put_device;
|
|
}
|
|
|
|
priv->rf[TRDY] = devm_regmap_field_alloc(dev, priv->tm_map, priv->fields[TRDY]);
|
|
if (IS_ERR(priv->rf[TRDY])) {
|
|
ret = PTR_ERR(priv->rf[TRDY]);
|
|
goto err_put_device;
|
|
}
|
|
|
|
/* This loop might need changes if enum regfield_ids is reordered */
|
|
for (j = LAST_TEMP_0; j <= UP_THRESH_15; j += 16) {
|
|
for (i = 0; i < priv->feat->max_sensors; i++) {
|
|
int idx = j + i;
|
|
|
|
priv->rf[idx] = devm_regmap_field_alloc(dev,
|
|
priv->tm_map,
|
|
priv->fields[idx]);
|
|
if (IS_ERR(priv->rf[idx])) {
|
|
ret = PTR_ERR(priv->rf[idx]);
|
|
goto err_put_device;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (priv->feat->crit_int || tsens_version(priv) < VER_0_1) {
|
|
/* Loop might need changes if enum regfield_ids is reordered */
|
|
for (j = CRITICAL_STATUS_0; j <= CRIT_THRESH_15; j += 16) {
|
|
for (i = 0; i < priv->feat->max_sensors; i++) {
|
|
int idx = j + i;
|
|
|
|
priv->rf[idx] =
|
|
devm_regmap_field_alloc(dev,
|
|
priv->tm_map,
|
|
priv->fields[idx]);
|
|
if (IS_ERR(priv->rf[idx])) {
|
|
ret = PTR_ERR(priv->rf[idx]);
|
|
goto err_put_device;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (tsens_version(priv) > VER_1_X && ver_minor > 2) {
|
|
/* Watchdog is present only on v2.3+ */
|
|
priv->feat->has_watchdog = 1;
|
|
for (i = WDOG_BARK_STATUS; i <= CC_MON_MASK; i++) {
|
|
priv->rf[i] = devm_regmap_field_alloc(dev, priv->tm_map,
|
|
priv->fields[i]);
|
|
if (IS_ERR(priv->rf[i])) {
|
|
ret = PTR_ERR(priv->rf[i]);
|
|
goto err_put_device;
|
|
}
|
|
}
|
|
/*
|
|
* Watchdog is already enabled, unmask the bark.
|
|
* Disable cycle completion monitoring
|
|
*/
|
|
regmap_field_write(priv->rf[WDOG_BARK_MASK], 0);
|
|
regmap_field_write(priv->rf[CC_MON_MASK], 1);
|
|
}
|
|
|
|
spin_lock_init(&priv->ul_lock);
|
|
|
|
/* VER_0 interrupt doesn't need to be enabled */
|
|
if (tsens_version(priv) >= VER_0_1)
|
|
tsens_enable_irq(priv);
|
|
|
|
tsens_debug_init(op);
|
|
|
|
err_put_device:
|
|
put_device(&op->dev);
|
|
return ret;
|
|
}
|
|
|
|
static int tsens_get_temp(void *data, int *temp)
|
|
{
|
|
struct tsens_sensor *s = data;
|
|
struct tsens_priv *priv = s->priv;
|
|
|
|
return priv->ops->get_temp(s, temp);
|
|
}
|
|
|
|
static int tsens_get_trend(void *data, int trip, enum thermal_trend *trend)
|
|
{
|
|
struct tsens_sensor *s = data;
|
|
struct tsens_priv *priv = s->priv;
|
|
|
|
if (priv->ops->get_trend)
|
|
return priv->ops->get_trend(s, trend);
|
|
|
|
return -ENOTSUPP;
|
|
}
|
|
|
|
static int __maybe_unused tsens_suspend(struct device *dev)
|
|
{
|
|
struct tsens_priv *priv = dev_get_drvdata(dev);
|
|
|
|
if (priv->ops && priv->ops->suspend)
|
|
return priv->ops->suspend(priv);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused tsens_resume(struct device *dev)
|
|
{
|
|
struct tsens_priv *priv = dev_get_drvdata(dev);
|
|
|
|
if (priv->ops && priv->ops->resume)
|
|
return priv->ops->resume(priv);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static SIMPLE_DEV_PM_OPS(tsens_pm_ops, tsens_suspend, tsens_resume);
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static const struct of_device_id tsens_table[] = {
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{
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.compatible = "qcom,ipq8064-tsens",
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.data = &data_8960,
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}, {
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.compatible = "qcom,mdm9607-tsens",
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.data = &data_9607,
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}, {
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.compatible = "qcom,msm8916-tsens",
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.data = &data_8916,
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}, {
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.compatible = "qcom,msm8939-tsens",
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.data = &data_8939,
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}, {
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.compatible = "qcom,msm8974-tsens",
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.data = &data_8974,
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}, {
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.compatible = "qcom,msm8976-tsens",
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.data = &data_8976,
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}, {
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.compatible = "qcom,msm8996-tsens",
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.data = &data_8996,
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}, {
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.compatible = "qcom,tsens-v1",
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.data = &data_tsens_v1,
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}, {
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.compatible = "qcom,tsens-v2",
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.data = &data_tsens_v2,
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},
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{}
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};
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MODULE_DEVICE_TABLE(of, tsens_table);
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static const struct thermal_zone_of_device_ops tsens_of_ops = {
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.get_temp = tsens_get_temp,
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.get_trend = tsens_get_trend,
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.set_trips = tsens_set_trips,
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};
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static int tsens_register_irq(struct tsens_priv *priv, char *irqname,
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irq_handler_t thread_fn)
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{
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struct platform_device *pdev;
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int ret, irq;
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pdev = of_find_device_by_node(priv->dev->of_node);
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if (!pdev)
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return -ENODEV;
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|
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irq = platform_get_irq_byname(pdev, irqname);
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if (irq < 0) {
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ret = irq;
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/* For old DTs with no IRQ defined */
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if (irq == -ENXIO)
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ret = 0;
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} else {
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/* VER_0 interrupt is TRIGGER_RISING, VER_0_1 and up is ONESHOT */
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if (tsens_version(priv) == VER_0)
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ret = devm_request_threaded_irq(&pdev->dev, irq,
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thread_fn, NULL,
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IRQF_TRIGGER_RISING,
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dev_name(&pdev->dev),
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priv);
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else
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ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
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thread_fn, IRQF_ONESHOT,
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dev_name(&pdev->dev),
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priv);
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if (ret)
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dev_err(&pdev->dev, "%s: failed to get irq\n",
|
|
__func__);
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else
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enable_irq_wake(irq);
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}
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|
|
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put_device(&pdev->dev);
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return ret;
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}
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static int tsens_register(struct tsens_priv *priv)
|
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{
|
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int i, ret;
|
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struct thermal_zone_device *tzd;
|
|
|
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for (i = 0; i < priv->num_sensors; i++) {
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priv->sensor[i].priv = priv;
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tzd = devm_thermal_zone_of_sensor_register(priv->dev, priv->sensor[i].hw_id,
|
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&priv->sensor[i],
|
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&tsens_of_ops);
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if (IS_ERR(tzd))
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continue;
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priv->sensor[i].tzd = tzd;
|
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if (priv->ops->enable)
|
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priv->ops->enable(priv, i);
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}
|
|
|
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/* VER_0 require to set MIN and MAX THRESH
|
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* These 2 regs are set using the:
|
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* - CRIT_THRESH_0 for MAX THRESH hardcoded to 120°C
|
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* - CRIT_THRESH_1 for MIN THRESH hardcoded to 0°C
|
|
*/
|
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if (tsens_version(priv) < VER_0_1) {
|
|
regmap_field_write(priv->rf[CRIT_THRESH_0],
|
|
tsens_mC_to_hw(priv->sensor, 120000));
|
|
|
|
regmap_field_write(priv->rf[CRIT_THRESH_1],
|
|
tsens_mC_to_hw(priv->sensor, 0));
|
|
}
|
|
|
|
ret = tsens_register_irq(priv, "uplow", tsens_irq_thread);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (priv->feat->crit_int)
|
|
ret = tsens_register_irq(priv, "critical",
|
|
tsens_critical_irq_thread);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int tsens_probe(struct platform_device *pdev)
|
|
{
|
|
int ret, i;
|
|
struct device *dev;
|
|
struct device_node *np;
|
|
struct tsens_priv *priv;
|
|
const struct tsens_plat_data *data;
|
|
const struct of_device_id *id;
|
|
u32 num_sensors;
|
|
|
|
if (pdev->dev.of_node)
|
|
dev = &pdev->dev;
|
|
else
|
|
dev = pdev->dev.parent;
|
|
|
|
np = dev->of_node;
|
|
|
|
id = of_match_node(tsens_table, np);
|
|
if (id)
|
|
data = id->data;
|
|
else
|
|
data = &data_8960;
|
|
|
|
num_sensors = data->num_sensors;
|
|
|
|
if (np)
|
|
of_property_read_u32(np, "#qcom,sensors", &num_sensors);
|
|
|
|
if (num_sensors <= 0) {
|
|
dev_err(dev, "%s: invalid number of sensors\n", __func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
priv = devm_kzalloc(dev,
|
|
struct_size(priv, sensor, num_sensors),
|
|
GFP_KERNEL);
|
|
if (!priv)
|
|
return -ENOMEM;
|
|
|
|
priv->dev = dev;
|
|
priv->num_sensors = num_sensors;
|
|
priv->ops = data->ops;
|
|
for (i = 0; i < priv->num_sensors; i++) {
|
|
if (data->hw_ids)
|
|
priv->sensor[i].hw_id = data->hw_ids[i];
|
|
else
|
|
priv->sensor[i].hw_id = i;
|
|
}
|
|
priv->feat = data->feat;
|
|
priv->fields = data->fields;
|
|
|
|
platform_set_drvdata(pdev, priv);
|
|
|
|
if (!priv->ops || !priv->ops->init || !priv->ops->get_temp)
|
|
return -EINVAL;
|
|
|
|
ret = priv->ops->init(priv);
|
|
if (ret < 0) {
|
|
dev_err(dev, "%s: init failed\n", __func__);
|
|
return ret;
|
|
}
|
|
|
|
if (priv->ops->calibrate) {
|
|
ret = priv->ops->calibrate(priv);
|
|
if (ret < 0) {
|
|
if (ret != -EPROBE_DEFER)
|
|
dev_err(dev, "%s: calibration failed\n", __func__);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
return tsens_register(priv);
|
|
}
|
|
|
|
static int tsens_remove(struct platform_device *pdev)
|
|
{
|
|
struct tsens_priv *priv = platform_get_drvdata(pdev);
|
|
|
|
debugfs_remove_recursive(priv->debug_root);
|
|
tsens_disable_irq(priv);
|
|
if (priv->ops->disable)
|
|
priv->ops->disable(priv);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver tsens_driver = {
|
|
.probe = tsens_probe,
|
|
.remove = tsens_remove,
|
|
.driver = {
|
|
.name = "qcom-tsens",
|
|
.pm = &tsens_pm_ops,
|
|
.of_match_table = tsens_table,
|
|
},
|
|
};
|
|
module_platform_driver(tsens_driver);
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_DESCRIPTION("QCOM Temperature Sensor driver");
|
|
MODULE_ALIAS("platform:qcom-tsens");
|