forked from rrcarlosr/Jetpack
628 lines
16 KiB
C
628 lines
16 KiB
C
/*
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* Hisilicon thermal sensor driver
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*
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* Copyright (c) 2014-2015 Hisilicon Limited.
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* Copyright (c) 2014-2015 Linaro Limited.
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*
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* Xinwei Kong <kong.kongxinwei@hisilicon.com>
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* Leo Yan <leo.yan@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/cpufreq.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/io.h>
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#include <linux/of_device.h>
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#include "thermal_core.h"
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#define HI6220_TEMP0_LAG (0x0)
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#define HI6220_TEMP0_TH (0x4)
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#define HI6220_TEMP0_RST_TH (0x8)
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#define HI6220_TEMP0_CFG (0xC)
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#define HI6220_TEMP0_CFG_SS_MSK (0xF000)
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#define HI6220_TEMP0_CFG_HDAK_MSK (0x30)
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#define HI6220_TEMP0_EN (0x10)
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#define HI6220_TEMP0_INT_EN (0x14)
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#define HI6220_TEMP0_INT_CLR (0x18)
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#define HI6220_TEMP0_RST_MSK (0x1C)
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#define HI6220_TEMP0_VALUE (0x28)
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#define HI3660_OFFSET(chan) ((chan) * 0x40)
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#define HI3660_TEMP(chan) (HI3660_OFFSET(chan) + 0x1C)
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#define HI3660_TH(chan) (HI3660_OFFSET(chan) + 0x20)
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#define HI3660_LAG(chan) (HI3660_OFFSET(chan) + 0x28)
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#define HI3660_INT_EN(chan) (HI3660_OFFSET(chan) + 0x2C)
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#define HI3660_INT_CLR(chan) (HI3660_OFFSET(chan) + 0x30)
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#define HI6220_TEMP_BASE (-60000)
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#define HI6220_TEMP_RESET (100000)
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#define HI6220_TEMP_STEP (785)
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#define HI6220_TEMP_LAG (3500)
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#define HI3660_TEMP_BASE (-63780)
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#define HI3660_TEMP_STEP (205)
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#define HI3660_TEMP_LAG (4000)
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#define HI6220_DEFAULT_SENSOR 2
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#define HI3660_DEFAULT_SENSOR 1
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struct hisi_thermal_sensor {
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struct thermal_zone_device *tzd;
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uint32_t id;
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uint32_t thres_temp;
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};
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struct hisi_thermal_data {
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int (*get_temp)(struct hisi_thermal_data *data);
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int (*enable_sensor)(struct hisi_thermal_data *data);
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int (*disable_sensor)(struct hisi_thermal_data *data);
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int (*irq_handler)(struct hisi_thermal_data *data);
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struct platform_device *pdev;
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struct clk *clk;
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struct hisi_thermal_sensor sensor;
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void __iomem *regs;
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int irq;
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};
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/*
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* The temperature computation on the tsensor is as follow:
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* Unit: millidegree Celsius
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* Step: 200/255 (0.7843)
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* Temperature base: -60°C
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*
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* The register is programmed in temperature steps, every step is 785
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* millidegree and begins at -60 000 m°C
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*
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* The temperature from the steps:
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*
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* Temp = TempBase + (steps x 785)
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*
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* and the steps from the temperature:
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*
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* steps = (Temp - TempBase) / 785
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*
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*/
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static inline int hi6220_thermal_step_to_temp(int step)
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{
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return HI6220_TEMP_BASE + (step * HI6220_TEMP_STEP);
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}
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static inline int hi6220_thermal_temp_to_step(int temp)
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{
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return DIV_ROUND_UP(temp - HI6220_TEMP_BASE, HI6220_TEMP_STEP);
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}
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/*
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* for Hi3660,
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* Step: 189/922 (0.205)
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* Temperature base: -63.780°C
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*
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* The register is programmed in temperature steps, every step is 205
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* millidegree and begins at -63 780 m°C
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*/
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static inline int hi3660_thermal_step_to_temp(int step)
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{
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return HI3660_TEMP_BASE + step * HI3660_TEMP_STEP;
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}
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static inline int hi3660_thermal_temp_to_step(int temp)
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{
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return DIV_ROUND_UP(temp - HI3660_TEMP_BASE, HI3660_TEMP_STEP);
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}
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/*
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* The lag register contains 5 bits encoding the temperature in steps.
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*
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* Each time the temperature crosses the threshold boundary, an
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* interrupt is raised. It could be when the temperature is going
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* above the threshold or below. However, if the temperature is
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* fluctuating around this value due to the load, we can receive
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* several interrupts which may not desired.
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*
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* We can setup a temperature representing the delta between the
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* threshold and the current temperature when the temperature is
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* decreasing.
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*
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* For instance: the lag register is 5°C, the threshold is 65°C, when
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* the temperature reaches 65°C an interrupt is raised and when the
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* temperature decrease to 65°C - 5°C another interrupt is raised.
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*
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* A very short lag can lead to an interrupt storm, a long lag
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* increase the latency to react to the temperature changes. In our
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* case, that is not really a problem as we are polling the
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* temperature.
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*
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* [0:4] : lag register
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*
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* The temperature is coded in steps, cf. HI6220_TEMP_STEP.
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*
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* Min : 0x00 : 0.0 °C
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* Max : 0x1F : 24.3 °C
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*
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* The 'value' parameter is in milliCelsius.
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*/
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static inline void hi6220_thermal_set_lag(void __iomem *addr, int value)
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{
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writel(DIV_ROUND_UP(value, HI6220_TEMP_STEP) & 0x1F,
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addr + HI6220_TEMP0_LAG);
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}
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static inline void hi6220_thermal_alarm_clear(void __iomem *addr, int value)
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{
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writel(value, addr + HI6220_TEMP0_INT_CLR);
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}
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static inline void hi6220_thermal_alarm_enable(void __iomem *addr, int value)
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{
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writel(value, addr + HI6220_TEMP0_INT_EN);
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}
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static inline void hi6220_thermal_alarm_set(void __iomem *addr, int temp)
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{
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writel(hi6220_thermal_temp_to_step(temp) | 0x0FFFFFF00,
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addr + HI6220_TEMP0_TH);
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}
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static inline void hi6220_thermal_reset_set(void __iomem *addr, int temp)
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{
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writel(hi6220_thermal_temp_to_step(temp), addr + HI6220_TEMP0_RST_TH);
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}
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static inline void hi6220_thermal_reset_enable(void __iomem *addr, int value)
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{
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writel(value, addr + HI6220_TEMP0_RST_MSK);
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}
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static inline void hi6220_thermal_enable(void __iomem *addr, int value)
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{
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writel(value, addr + HI6220_TEMP0_EN);
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}
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static inline int hi6220_thermal_get_temperature(void __iomem *addr)
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{
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return hi6220_thermal_step_to_temp(readl(addr + HI6220_TEMP0_VALUE));
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}
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/*
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* [0:6] lag register
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*
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* The temperature is coded in steps, cf. HI3660_TEMP_STEP.
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*
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* Min : 0x00 : 0.0 °C
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* Max : 0x7F : 26.0 °C
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*
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*/
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static inline void hi3660_thermal_set_lag(void __iomem *addr,
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int id, int value)
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{
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writel(DIV_ROUND_UP(value, HI3660_TEMP_STEP) & 0x7F,
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addr + HI3660_LAG(id));
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}
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static inline void hi3660_thermal_alarm_clear(void __iomem *addr,
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int id, int value)
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{
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writel(value, addr + HI3660_INT_CLR(id));
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}
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static inline void hi3660_thermal_alarm_enable(void __iomem *addr,
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int id, int value)
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{
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writel(value, addr + HI3660_INT_EN(id));
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}
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static inline void hi3660_thermal_alarm_set(void __iomem *addr,
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int id, int value)
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{
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writel(value, addr + HI3660_TH(id));
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}
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static inline int hi3660_thermal_get_temperature(void __iomem *addr, int id)
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{
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return hi3660_thermal_step_to_temp(readl(addr + HI3660_TEMP(id)));
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}
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/*
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* Temperature configuration register - Sensor selection
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*
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* Bits [19:12]
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*
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* 0x0: local sensor (default)
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* 0x1: remote sensor 1 (ACPU cluster 1)
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* 0x2: remote sensor 2 (ACPU cluster 0)
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* 0x3: remote sensor 3 (G3D)
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*/
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static inline void hi6220_thermal_sensor_select(void __iomem *addr, int sensor)
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{
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writel((readl(addr + HI6220_TEMP0_CFG) & ~HI6220_TEMP0_CFG_SS_MSK) |
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(sensor << 12), addr + HI6220_TEMP0_CFG);
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}
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/*
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* Temperature configuration register - Hdak conversion polling interval
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*
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* Bits [5:4]
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*
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* 0x0 : 0.768 ms
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* 0x1 : 6.144 ms
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* 0x2 : 49.152 ms
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* 0x3 : 393.216 ms
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*/
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static inline void hi6220_thermal_hdak_set(void __iomem *addr, int value)
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{
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writel((readl(addr + HI6220_TEMP0_CFG) & ~HI6220_TEMP0_CFG_HDAK_MSK) |
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(value << 4), addr + HI6220_TEMP0_CFG);
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}
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static int hi6220_thermal_irq_handler(struct hisi_thermal_data *data)
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{
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hi6220_thermal_alarm_clear(data->regs, 1);
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return 0;
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}
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static int hi3660_thermal_irq_handler(struct hisi_thermal_data *data)
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{
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hi3660_thermal_alarm_clear(data->regs, data->sensor.id, 1);
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return 0;
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}
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static int hi6220_thermal_get_temp(struct hisi_thermal_data *data)
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{
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return hi6220_thermal_get_temperature(data->regs);
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}
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static int hi3660_thermal_get_temp(struct hisi_thermal_data *data)
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{
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return hi3660_thermal_get_temperature(data->regs, data->sensor.id);
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}
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static int hi6220_thermal_disable_sensor(struct hisi_thermal_data *data)
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{
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/* disable sensor module */
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hi6220_thermal_enable(data->regs, 0);
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hi6220_thermal_alarm_enable(data->regs, 0);
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hi6220_thermal_reset_enable(data->regs, 0);
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clk_disable_unprepare(data->clk);
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return 0;
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}
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static int hi3660_thermal_disable_sensor(struct hisi_thermal_data *data)
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{
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/* disable sensor module */
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hi3660_thermal_alarm_enable(data->regs, data->sensor.id, 0);
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return 0;
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}
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static int hi6220_thermal_enable_sensor(struct hisi_thermal_data *data)
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{
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struct hisi_thermal_sensor *sensor = &data->sensor;
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int ret;
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/* enable clock for tsensor */
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ret = clk_prepare_enable(data->clk);
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if (ret)
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return ret;
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/* disable module firstly */
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hi6220_thermal_reset_enable(data->regs, 0);
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hi6220_thermal_enable(data->regs, 0);
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/* select sensor id */
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hi6220_thermal_sensor_select(data->regs, sensor->id);
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/* setting the hdak time */
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hi6220_thermal_hdak_set(data->regs, 0);
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/* setting lag value between current temp and the threshold */
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hi6220_thermal_set_lag(data->regs, HI6220_TEMP_LAG);
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/* enable for interrupt */
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hi6220_thermal_alarm_set(data->regs, sensor->thres_temp);
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hi6220_thermal_reset_set(data->regs, HI6220_TEMP_RESET);
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/* enable module */
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hi6220_thermal_reset_enable(data->regs, 1);
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hi6220_thermal_enable(data->regs, 1);
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hi6220_thermal_alarm_clear(data->regs, 0);
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hi6220_thermal_alarm_enable(data->regs, 1);
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return 0;
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}
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static int hi3660_thermal_enable_sensor(struct hisi_thermal_data *data)
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{
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unsigned int value;
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struct hisi_thermal_sensor *sensor = &data->sensor;
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/* disable interrupt */
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hi3660_thermal_alarm_enable(data->regs, sensor->id, 0);
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/* setting lag value between current temp and the threshold */
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hi3660_thermal_set_lag(data->regs, sensor->id, HI3660_TEMP_LAG);
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/* set interrupt threshold */
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value = hi3660_thermal_temp_to_step(sensor->thres_temp);
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hi3660_thermal_alarm_set(data->regs, sensor->id, value);
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/* enable interrupt */
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hi3660_thermal_alarm_clear(data->regs, sensor->id, 1);
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hi3660_thermal_alarm_enable(data->regs, sensor->id, 1);
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return 0;
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}
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static int hi6220_thermal_probe(struct hisi_thermal_data *data)
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{
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struct platform_device *pdev = data->pdev;
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struct device *dev = &pdev->dev;
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struct resource *res;
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int ret;
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data->get_temp = hi6220_thermal_get_temp;
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data->enable_sensor = hi6220_thermal_enable_sensor;
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data->disable_sensor = hi6220_thermal_disable_sensor;
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data->irq_handler = hi6220_thermal_irq_handler;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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data->regs = devm_ioremap_resource(dev, res);
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if (IS_ERR(data->regs)) {
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dev_err(dev, "failed to get io address\n");
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return PTR_ERR(data->regs);
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}
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data->clk = devm_clk_get(dev, "thermal_clk");
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if (IS_ERR(data->clk)) {
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ret = PTR_ERR(data->clk);
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if (ret != -EPROBE_DEFER)
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dev_err(dev, "failed to get thermal clk: %d\n", ret);
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return ret;
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}
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data->irq = platform_get_irq(pdev, 0);
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if (data->irq < 0)
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return data->irq;
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data->sensor.id = HI6220_DEFAULT_SENSOR;
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return 0;
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}
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static int hi3660_thermal_probe(struct hisi_thermal_data *data)
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{
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struct platform_device *pdev = data->pdev;
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struct device *dev = &pdev->dev;
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struct resource *res;
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data->get_temp = hi3660_thermal_get_temp;
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data->enable_sensor = hi3660_thermal_enable_sensor;
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data->disable_sensor = hi3660_thermal_disable_sensor;
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data->irq_handler = hi3660_thermal_irq_handler;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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data->regs = devm_ioremap_resource(dev, res);
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if (IS_ERR(data->regs)) {
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dev_err(dev, "failed to get io address\n");
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return PTR_ERR(data->regs);
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}
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data->irq = platform_get_irq(pdev, 0);
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if (data->irq < 0)
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return data->irq;
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data->sensor.id = HI3660_DEFAULT_SENSOR;
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return 0;
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}
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static int hisi_thermal_get_temp(void *__data, int *temp)
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{
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struct hisi_thermal_data *data = __data;
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struct hisi_thermal_sensor *sensor = &data->sensor;
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*temp = data->get_temp(data);
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dev_dbg(&data->pdev->dev, "id=%d, temp=%d, thres=%d\n",
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sensor->id, *temp, sensor->thres_temp);
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return 0;
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}
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static const struct thermal_zone_of_device_ops hisi_of_thermal_ops = {
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.get_temp = hisi_thermal_get_temp,
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};
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static irqreturn_t hisi_thermal_alarm_irq_thread(int irq, void *dev)
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{
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struct hisi_thermal_data *data = dev;
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struct hisi_thermal_sensor *sensor = &data->sensor;
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int temp = 0;
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data->irq_handler(data);
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hisi_thermal_get_temp(data, &temp);
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if (temp >= sensor->thres_temp) {
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dev_crit(&data->pdev->dev, "THERMAL ALARM: %d > %d\n",
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temp, sensor->thres_temp);
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thermal_zone_device_update(data->sensor.tzd,
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THERMAL_EVENT_UNSPECIFIED);
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} else {
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dev_crit(&data->pdev->dev, "THERMAL ALARM stopped: %d < %d\n",
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temp, sensor->thres_temp);
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}
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return IRQ_HANDLED;
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}
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static int hisi_thermal_register_sensor(struct platform_device *pdev,
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struct hisi_thermal_data *data,
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struct hisi_thermal_sensor *sensor)
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{
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int ret, i;
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const struct thermal_trip *trip;
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sensor->tzd = devm_thermal_zone_of_sensor_register(&pdev->dev,
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sensor->id, data,
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&hisi_of_thermal_ops);
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if (IS_ERR(sensor->tzd)) {
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ret = PTR_ERR(sensor->tzd);
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sensor->tzd = NULL;
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dev_err(&pdev->dev, "failed to register sensor id %d: %d\n",
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sensor->id, ret);
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return ret;
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}
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trip = of_thermal_get_trip_points(sensor->tzd);
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|
|
for (i = 0; i < of_thermal_get_ntrips(sensor->tzd); i++) {
|
|
if (trip[i].type == THERMAL_TRIP_PASSIVE) {
|
|
sensor->thres_temp = trip[i].temperature;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id of_hisi_thermal_match[] = {
|
|
{
|
|
.compatible = "hisilicon,tsensor",
|
|
.data = hi6220_thermal_probe
|
|
},
|
|
{
|
|
.compatible = "hisilicon,hi3660-tsensor",
|
|
.data = hi3660_thermal_probe
|
|
},
|
|
{ /* end */ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, of_hisi_thermal_match);
|
|
|
|
static void hisi_thermal_toggle_sensor(struct hisi_thermal_sensor *sensor,
|
|
bool on)
|
|
{
|
|
struct thermal_zone_device *tzd = sensor->tzd;
|
|
|
|
tzd->ops->set_mode(tzd,
|
|
on ? THERMAL_DEVICE_ENABLED : THERMAL_DEVICE_DISABLED);
|
|
}
|
|
|
|
static int hisi_thermal_probe(struct platform_device *pdev)
|
|
{
|
|
struct hisi_thermal_data *data;
|
|
int const (*platform_probe)(struct hisi_thermal_data *);
|
|
struct device *dev = &pdev->dev;
|
|
int ret;
|
|
|
|
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
data->pdev = pdev;
|
|
platform_set_drvdata(pdev, data);
|
|
|
|
platform_probe = of_device_get_match_data(dev);
|
|
if (!platform_probe) {
|
|
dev_err(dev, "failed to get probe func\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = platform_probe(data);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = hisi_thermal_register_sensor(pdev, data,
|
|
&data->sensor);
|
|
if (ret) {
|
|
dev_err(dev, "failed to register thermal sensor: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = data->enable_sensor(data);
|
|
if (ret) {
|
|
dev_err(dev, "Failed to setup the sensor: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
if (data->irq) {
|
|
ret = devm_request_threaded_irq(dev, data->irq, NULL,
|
|
hisi_thermal_alarm_irq_thread,
|
|
IRQF_ONESHOT, "hisi_thermal", data);
|
|
if (ret < 0) {
|
|
dev_err(dev, "failed to request alarm irq: %d\n", ret);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
hisi_thermal_toggle_sensor(&data->sensor, true);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int hisi_thermal_remove(struct platform_device *pdev)
|
|
{
|
|
struct hisi_thermal_data *data = platform_get_drvdata(pdev);
|
|
struct hisi_thermal_sensor *sensor = &data->sensor;
|
|
|
|
hisi_thermal_toggle_sensor(sensor, false);
|
|
|
|
data->disable_sensor(data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int hisi_thermal_suspend(struct device *dev)
|
|
{
|
|
struct hisi_thermal_data *data = dev_get_drvdata(dev);
|
|
|
|
data->disable_sensor(data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int hisi_thermal_resume(struct device *dev)
|
|
{
|
|
struct hisi_thermal_data *data = dev_get_drvdata(dev);
|
|
|
|
return data->enable_sensor(data);
|
|
}
|
|
#endif
|
|
|
|
static SIMPLE_DEV_PM_OPS(hisi_thermal_pm_ops,
|
|
hisi_thermal_suspend, hisi_thermal_resume);
|
|
|
|
static struct platform_driver hisi_thermal_driver = {
|
|
.driver = {
|
|
.name = "hisi_thermal",
|
|
.pm = &hisi_thermal_pm_ops,
|
|
.of_match_table = of_hisi_thermal_match,
|
|
},
|
|
.probe = hisi_thermal_probe,
|
|
.remove = hisi_thermal_remove,
|
|
};
|
|
|
|
module_platform_driver(hisi_thermal_driver);
|
|
|
|
MODULE_AUTHOR("Xinwei Kong <kong.kongxinwei@hisilicon.com>");
|
|
MODULE_AUTHOR("Leo Yan <leo.yan@linaro.org>");
|
|
MODULE_DESCRIPTION("Hisilicon thermal driver");
|
|
MODULE_LICENSE("GPL v2");
|