350 lines
9.0 KiB
C
350 lines
9.0 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Broadcom STB AVS TMON thermal sensor driver
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*
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* Copyright (c) 2015-2017 Broadcom
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*/
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#define DRV_NAME "brcmstb_thermal"
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#define pr_fmt(fmt) DRV_NAME ": " fmt
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#include <linux/bitops.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/irqreturn.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/of_device.h>
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#include <linux/thermal.h>
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#define AVS_TMON_STATUS 0x00
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#define AVS_TMON_STATUS_valid_msk BIT(11)
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#define AVS_TMON_STATUS_data_msk GENMASK(10, 1)
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#define AVS_TMON_STATUS_data_shift 1
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#define AVS_TMON_EN_OVERTEMP_RESET 0x04
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#define AVS_TMON_EN_OVERTEMP_RESET_msk BIT(0)
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#define AVS_TMON_RESET_THRESH 0x08
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#define AVS_TMON_RESET_THRESH_msk GENMASK(10, 1)
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#define AVS_TMON_RESET_THRESH_shift 1
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#define AVS_TMON_INT_IDLE_TIME 0x10
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#define AVS_TMON_EN_TEMP_INT_SRCS 0x14
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#define AVS_TMON_EN_TEMP_INT_SRCS_high BIT(1)
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#define AVS_TMON_EN_TEMP_INT_SRCS_low BIT(0)
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#define AVS_TMON_INT_THRESH 0x18
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#define AVS_TMON_INT_THRESH_high_msk GENMASK(26, 17)
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#define AVS_TMON_INT_THRESH_high_shift 17
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#define AVS_TMON_INT_THRESH_low_msk GENMASK(10, 1)
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#define AVS_TMON_INT_THRESH_low_shift 1
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#define AVS_TMON_TEMP_INT_CODE 0x1c
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#define AVS_TMON_TP_TEST_ENABLE 0x20
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/* Default coefficients */
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#define AVS_TMON_TEMP_SLOPE 487
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#define AVS_TMON_TEMP_OFFSET 410040
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/* HW related temperature constants */
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#define AVS_TMON_TEMP_MAX 0x3ff
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#define AVS_TMON_TEMP_MIN -88161
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#define AVS_TMON_TEMP_MASK AVS_TMON_TEMP_MAX
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enum avs_tmon_trip_type {
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TMON_TRIP_TYPE_LOW = 0,
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TMON_TRIP_TYPE_HIGH,
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TMON_TRIP_TYPE_RESET,
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TMON_TRIP_TYPE_MAX,
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};
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struct avs_tmon_trip {
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/* HW bit to enable the trip */
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u32 enable_offs;
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u32 enable_mask;
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/* HW field to read the trip temperature */
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u32 reg_offs;
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u32 reg_msk;
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int reg_shift;
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};
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static struct avs_tmon_trip avs_tmon_trips[] = {
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/* Trips when temperature is below threshold */
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[TMON_TRIP_TYPE_LOW] = {
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.enable_offs = AVS_TMON_EN_TEMP_INT_SRCS,
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.enable_mask = AVS_TMON_EN_TEMP_INT_SRCS_low,
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.reg_offs = AVS_TMON_INT_THRESH,
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.reg_msk = AVS_TMON_INT_THRESH_low_msk,
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.reg_shift = AVS_TMON_INT_THRESH_low_shift,
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},
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/* Trips when temperature is above threshold */
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[TMON_TRIP_TYPE_HIGH] = {
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.enable_offs = AVS_TMON_EN_TEMP_INT_SRCS,
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.enable_mask = AVS_TMON_EN_TEMP_INT_SRCS_high,
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.reg_offs = AVS_TMON_INT_THRESH,
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.reg_msk = AVS_TMON_INT_THRESH_high_msk,
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.reg_shift = AVS_TMON_INT_THRESH_high_shift,
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},
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/* Automatically resets chip when above threshold */
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[TMON_TRIP_TYPE_RESET] = {
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.enable_offs = AVS_TMON_EN_OVERTEMP_RESET,
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.enable_mask = AVS_TMON_EN_OVERTEMP_RESET_msk,
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.reg_offs = AVS_TMON_RESET_THRESH,
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.reg_msk = AVS_TMON_RESET_THRESH_msk,
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.reg_shift = AVS_TMON_RESET_THRESH_shift,
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},
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};
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struct brcmstb_thermal_priv {
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void __iomem *tmon_base;
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struct device *dev;
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struct thermal_zone_device *thermal;
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};
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/* Convert a HW code to a temperature reading (millidegree celsius) */
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static inline int avs_tmon_code_to_temp(struct thermal_zone_device *tz,
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u32 code)
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{
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return (AVS_TMON_TEMP_OFFSET -
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(int)((code & AVS_TMON_TEMP_MAX) * AVS_TMON_TEMP_SLOPE));
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}
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/*
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* Convert a temperature value (millidegree celsius) to a HW code
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*
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* @temp: temperature to convert
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* @low: if true, round toward the low side
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*/
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static inline u32 avs_tmon_temp_to_code(struct thermal_zone_device *tz,
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int temp, bool low)
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{
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if (temp < AVS_TMON_TEMP_MIN)
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return AVS_TMON_TEMP_MAX; /* Maximum code value */
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if (temp >= AVS_TMON_TEMP_OFFSET)
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return 0; /* Minimum code value */
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if (low)
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return (u32)(DIV_ROUND_UP(AVS_TMON_TEMP_OFFSET - temp,
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AVS_TMON_TEMP_SLOPE));
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else
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return (u32)((AVS_TMON_TEMP_OFFSET - temp) /
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AVS_TMON_TEMP_SLOPE);
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}
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static int brcmstb_get_temp(void *data, int *temp)
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{
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struct brcmstb_thermal_priv *priv = data;
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u32 val;
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long t;
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val = __raw_readl(priv->tmon_base + AVS_TMON_STATUS);
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if (!(val & AVS_TMON_STATUS_valid_msk)) {
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dev_err(priv->dev, "reading not valid\n");
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return -EIO;
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}
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val = (val & AVS_TMON_STATUS_data_msk) >> AVS_TMON_STATUS_data_shift;
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t = avs_tmon_code_to_temp(priv->thermal, val);
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if (t < 0)
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*temp = 0;
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else
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*temp = t;
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return 0;
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}
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static void avs_tmon_trip_enable(struct brcmstb_thermal_priv *priv,
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enum avs_tmon_trip_type type, int en)
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{
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struct avs_tmon_trip *trip = &avs_tmon_trips[type];
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u32 val = __raw_readl(priv->tmon_base + trip->enable_offs);
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dev_dbg(priv->dev, "%sable trip, type %d\n", en ? "en" : "dis", type);
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if (en)
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val |= trip->enable_mask;
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else
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val &= ~trip->enable_mask;
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__raw_writel(val, priv->tmon_base + trip->enable_offs);
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}
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static int avs_tmon_get_trip_temp(struct brcmstb_thermal_priv *priv,
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enum avs_tmon_trip_type type)
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{
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struct avs_tmon_trip *trip = &avs_tmon_trips[type];
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u32 val = __raw_readl(priv->tmon_base + trip->reg_offs);
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val &= trip->reg_msk;
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val >>= trip->reg_shift;
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return avs_tmon_code_to_temp(priv->thermal, val);
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}
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static void avs_tmon_set_trip_temp(struct brcmstb_thermal_priv *priv,
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enum avs_tmon_trip_type type,
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int temp)
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{
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struct avs_tmon_trip *trip = &avs_tmon_trips[type];
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u32 val, orig;
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dev_dbg(priv->dev, "set temp %d to %d\n", type, temp);
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/* round toward low temp for the low interrupt */
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val = avs_tmon_temp_to_code(priv->thermal, temp,
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type == TMON_TRIP_TYPE_LOW);
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val <<= trip->reg_shift;
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val &= trip->reg_msk;
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orig = __raw_readl(priv->tmon_base + trip->reg_offs);
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orig &= ~trip->reg_msk;
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orig |= val;
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__raw_writel(orig, priv->tmon_base + trip->reg_offs);
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}
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static int avs_tmon_get_intr_temp(struct brcmstb_thermal_priv *priv)
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{
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u32 val;
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val = __raw_readl(priv->tmon_base + AVS_TMON_TEMP_INT_CODE);
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return avs_tmon_code_to_temp(priv->thermal, val);
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}
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static irqreturn_t brcmstb_tmon_irq_thread(int irq, void *data)
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{
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struct brcmstb_thermal_priv *priv = data;
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int low, high, intr;
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low = avs_tmon_get_trip_temp(priv, TMON_TRIP_TYPE_LOW);
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high = avs_tmon_get_trip_temp(priv, TMON_TRIP_TYPE_HIGH);
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intr = avs_tmon_get_intr_temp(priv);
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dev_dbg(priv->dev, "low/intr/high: %d/%d/%d\n",
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low, intr, high);
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/* Disable high-temp until next threshold shift */
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if (intr >= high)
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avs_tmon_trip_enable(priv, TMON_TRIP_TYPE_HIGH, 0);
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/* Disable low-temp until next threshold shift */
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if (intr <= low)
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avs_tmon_trip_enable(priv, TMON_TRIP_TYPE_LOW, 0);
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/*
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* Notify using the interrupt temperature, in case the temperature
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* changes before it can next be read out
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*/
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thermal_zone_device_update(priv->thermal, intr);
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return IRQ_HANDLED;
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}
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static int brcmstb_set_trips(void *data, int low, int high)
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{
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struct brcmstb_thermal_priv *priv = data;
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dev_dbg(priv->dev, "set trips %d <--> %d\n", low, high);
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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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avs_tmon_trip_enable(priv, TMON_TRIP_TYPE_LOW, 0);
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} else {
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avs_tmon_set_trip_temp(priv, TMON_TRIP_TYPE_LOW, low);
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avs_tmon_trip_enable(priv, TMON_TRIP_TYPE_LOW, 1);
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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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avs_tmon_trip_enable(priv, TMON_TRIP_TYPE_HIGH, 0);
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} else {
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avs_tmon_set_trip_temp(priv, TMON_TRIP_TYPE_HIGH, high);
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avs_tmon_trip_enable(priv, TMON_TRIP_TYPE_HIGH, 1);
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}
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return 0;
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}
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static const struct thermal_zone_of_device_ops of_ops = {
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.get_temp = brcmstb_get_temp,
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.set_trips = brcmstb_set_trips,
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};
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static const struct of_device_id brcmstb_thermal_id_table[] = {
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{ .compatible = "brcm,avs-tmon" },
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{},
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};
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MODULE_DEVICE_TABLE(of, brcmstb_thermal_id_table);
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static int brcmstb_thermal_probe(struct platform_device *pdev)
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{
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struct thermal_zone_device *thermal;
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struct brcmstb_thermal_priv *priv;
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struct resource *res;
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int irq, ret;
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priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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priv->tmon_base = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(priv->tmon_base))
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return PTR_ERR(priv->tmon_base);
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priv->dev = &pdev->dev;
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platform_set_drvdata(pdev, priv);
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thermal = devm_thermal_zone_of_sensor_register(&pdev->dev, 0, priv,
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&of_ops);
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if (IS_ERR(thermal)) {
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ret = PTR_ERR(thermal);
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dev_err(&pdev->dev, "could not register sensor: %d\n", ret);
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return ret;
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}
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priv->thermal = thermal;
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irq = platform_get_irq(pdev, 0);
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if (irq < 0) {
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dev_err(&pdev->dev, "could not get IRQ\n");
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return irq;
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}
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ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
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brcmstb_tmon_irq_thread, IRQF_ONESHOT,
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DRV_NAME, priv);
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if (ret < 0) {
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dev_err(&pdev->dev, "could not request IRQ: %d\n", ret);
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return ret;
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}
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dev_info(&pdev->dev, "registered AVS TMON of-sensor driver\n");
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return 0;
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}
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static struct platform_driver brcmstb_thermal_driver = {
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.probe = brcmstb_thermal_probe,
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.driver = {
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.name = DRV_NAME,
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.of_match_table = brcmstb_thermal_id_table,
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},
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};
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module_platform_driver(brcmstb_thermal_driver);
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Brian Norris");
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MODULE_DESCRIPTION("Broadcom STB AVS TMON thermal driver");
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