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674 lines
17 KiB
674 lines
17 KiB
/* |
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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 <[email protected]> |
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* Leo Yan <[email protected]> |
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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_CLUSTER0_SENSOR 2 |
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#define HI6220_CLUSTER1_SENSOR 1 |
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#define HI3660_LITTLE_SENSOR 0 |
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#define HI3660_BIG_SENSOR 1 |
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#define HI3660_G3D_SENSOR 2 |
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#define HI3660_MODEM_SENSOR 3 |
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struct hisi_thermal_data; |
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struct hisi_thermal_sensor { |
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struct hisi_thermal_data *data; |
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struct thermal_zone_device *tzd; |
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const char *irq_name; |
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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_ops { |
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int (*get_temp)(struct hisi_thermal_sensor *sensor); |
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int (*enable_sensor)(struct hisi_thermal_sensor *sensor); |
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int (*disable_sensor)(struct hisi_thermal_sensor *sensor); |
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int (*irq_handler)(struct hisi_thermal_sensor *sensor); |
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int (*probe)(struct hisi_thermal_data *data); |
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}; |
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struct hisi_thermal_data { |
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const struct hisi_thermal_ops *ops; |
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struct hisi_thermal_sensor *sensor; |
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struct platform_device *pdev; |
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struct clk *clk; |
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void __iomem *regs; |
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int nr_sensors; |
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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_sensor *sensor) |
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{ |
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struct hisi_thermal_data *data = sensor->data; |
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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_sensor *sensor) |
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{ |
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struct hisi_thermal_data *data = sensor->data; |
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hi3660_thermal_alarm_clear(data->regs, 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_sensor *sensor) |
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{ |
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struct hisi_thermal_data *data = sensor->data; |
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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_sensor *sensor) |
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{ |
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struct hisi_thermal_data *data = sensor->data; |
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return hi3660_thermal_get_temperature(data->regs, sensor->id); |
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} |
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static int hi6220_thermal_disable_sensor(struct hisi_thermal_sensor *sensor) |
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{ |
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struct hisi_thermal_data *data = sensor->data; |
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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_sensor *sensor) |
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{ |
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struct hisi_thermal_data *data = sensor->data; |
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/* disable sensor module */ |
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hi3660_thermal_alarm_enable(data->regs, 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_sensor *sensor) |
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{ |
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struct hisi_thermal_data *data = sensor->data; |
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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_sensor *sensor) |
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{ |
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unsigned int value; |
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struct hisi_thermal_data *data = sensor->data; |
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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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int ret; |
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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->sensor = devm_kzalloc(dev, sizeof(*data->sensor), GFP_KERNEL); |
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if (!data->sensor) |
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return -ENOMEM; |
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data->sensor[0].id = HI6220_CLUSTER0_SENSOR; |
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data->sensor[0].irq_name = "tsensor_intr"; |
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data->sensor[0].data = data; |
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data->nr_sensors = 1; |
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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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data->nr_sensors = 1; |
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data->sensor = devm_kzalloc(dev, sizeof(*data->sensor) * |
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data->nr_sensors, GFP_KERNEL); |
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if (!data->sensor) |
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return -ENOMEM; |
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data->sensor[0].id = HI3660_BIG_SENSOR; |
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data->sensor[0].irq_name = "tsensor_a73"; |
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data->sensor[0].data = data; |
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data->sensor[1].id = HI3660_LITTLE_SENSOR; |
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data->sensor[1].irq_name = "tsensor_a53"; |
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data->sensor[1].data = data; |
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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_sensor *sensor = __data; |
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struct hisi_thermal_data *data = sensor->data; |
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*temp = data->ops->get_temp(sensor); |
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dev_dbg(&data->pdev->dev, "tzd=%p, id=%d, temp=%d, thres=%d\n", |
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sensor->tzd, 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_sensor *sensor = dev; |
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struct hisi_thermal_data *data = sensor->data; |
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int temp = 0; |
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data->ops->irq_handler(sensor); |
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hisi_thermal_get_temp(sensor, &temp); |
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if (temp >= sensor->thres_temp) { |
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dev_crit(&data->pdev->dev, |
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"sensor <%d> THERMAL ALARM: %d > %d\n", |
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sensor->id, temp, sensor->thres_temp); |
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thermal_zone_device_update(sensor->tzd, |
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THERMAL_EVENT_UNSPECIFIED); |
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} else { |
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dev_crit(&data->pdev->dev, |
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"sensor <%d> THERMAL ALARM stopped: %d < %d\n", |
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sensor->id, 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_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, sensor, |
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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++) { |
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if (trip[i].type == THERMAL_TRIP_PASSIVE) { |
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sensor->thres_temp = trip[i].temperature; |
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break; |
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} |
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} |
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return 0; |
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} |
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static const struct hisi_thermal_ops hi6220_ops = { |
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.get_temp = hi6220_thermal_get_temp, |
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.enable_sensor = hi6220_thermal_enable_sensor, |
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.disable_sensor = hi6220_thermal_disable_sensor, |
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.irq_handler = hi6220_thermal_irq_handler, |
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.probe = hi6220_thermal_probe, |
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}; |
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static const struct hisi_thermal_ops hi3660_ops = { |
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.get_temp = hi3660_thermal_get_temp, |
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.enable_sensor = hi3660_thermal_enable_sensor, |
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.disable_sensor = hi3660_thermal_disable_sensor, |
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.irq_handler = hi3660_thermal_irq_handler, |
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.probe = hi3660_thermal_probe, |
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}; |
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static const struct of_device_id of_hisi_thermal_match[] = { |
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{ |
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.compatible = "hisilicon,tsensor", |
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.data = &hi6220_ops, |
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}, |
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{ |
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.compatible = "hisilicon,hi3660-tsensor", |
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.data = &hi3660_ops, |
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}, |
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{ /* end */ } |
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}; |
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MODULE_DEVICE_TABLE(of, of_hisi_thermal_match); |
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|
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static void hisi_thermal_toggle_sensor(struct hisi_thermal_sensor *sensor, |
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bool on) |
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{ |
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struct thermal_zone_device *tzd = sensor->tzd; |
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if (on) |
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thermal_zone_device_enable(tzd); |
|
else |
|
thermal_zone_device_disable(tzd); |
|
} |
|
|
|
static int hisi_thermal_probe(struct platform_device *pdev) |
|
{ |
|
struct hisi_thermal_data *data; |
|
struct device *dev = &pdev->dev; |
|
struct resource *res; |
|
int i, ret; |
|
|
|
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); |
|
if (!data) |
|
return -ENOMEM; |
|
|
|
data->pdev = pdev; |
|
platform_set_drvdata(pdev, data); |
|
data->ops = of_device_get_match_data(dev); |
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
|
data->regs = devm_ioremap_resource(dev, res); |
|
if (IS_ERR(data->regs)) |
|
return PTR_ERR(data->regs); |
|
|
|
ret = data->ops->probe(data); |
|
if (ret) |
|
return ret; |
|
|
|
for (i = 0; i < data->nr_sensors; i++) { |
|
struct hisi_thermal_sensor *sensor = &data->sensor[i]; |
|
|
|
ret = hisi_thermal_register_sensor(pdev, sensor); |
|
if (ret) { |
|
dev_err(dev, "failed to register thermal sensor: %d\n", |
|
ret); |
|
return ret; |
|
} |
|
|
|
ret = platform_get_irq(pdev, 0); |
|
if (ret < 0) |
|
return ret; |
|
|
|
ret = devm_request_threaded_irq(dev, ret, NULL, |
|
hisi_thermal_alarm_irq_thread, |
|
IRQF_ONESHOT, sensor->irq_name, |
|
sensor); |
|
if (ret < 0) { |
|
dev_err(dev, "Failed to request alarm irq: %d\n", ret); |
|
return ret; |
|
} |
|
|
|
ret = data->ops->enable_sensor(sensor); |
|
if (ret) { |
|
dev_err(dev, "Failed to setup the sensor: %d\n", ret); |
|
return ret; |
|
} |
|
|
|
hisi_thermal_toggle_sensor(sensor, true); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int hisi_thermal_remove(struct platform_device *pdev) |
|
{ |
|
struct hisi_thermal_data *data = platform_get_drvdata(pdev); |
|
int i; |
|
|
|
for (i = 0; i < data->nr_sensors; i++) { |
|
struct hisi_thermal_sensor *sensor = &data->sensor[i]; |
|
|
|
hisi_thermal_toggle_sensor(sensor, false); |
|
data->ops->disable_sensor(sensor); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
#ifdef CONFIG_PM_SLEEP |
|
static int hisi_thermal_suspend(struct device *dev) |
|
{ |
|
struct hisi_thermal_data *data = dev_get_drvdata(dev); |
|
int i; |
|
|
|
for (i = 0; i < data->nr_sensors; i++) |
|
data->ops->disable_sensor(&data->sensor[i]); |
|
|
|
return 0; |
|
} |
|
|
|
static int hisi_thermal_resume(struct device *dev) |
|
{ |
|
struct hisi_thermal_data *data = dev_get_drvdata(dev); |
|
int i, ret = 0; |
|
|
|
for (i = 0; i < data->nr_sensors; i++) |
|
ret |= data->ops->enable_sensor(&data->sensor[i]); |
|
|
|
return ret; |
|
} |
|
#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 <[email protected]>"); |
|
MODULE_AUTHOR("Leo Yan <[email protected]>"); |
|
MODULE_DESCRIPTION("HiSilicon thermal driver"); |
|
MODULE_LICENSE("GPL v2");
|
|
|