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thermal: rockchip: add the notes for better reading 

To update the notes for keeping in mind that quickly in case
someone re-read this driver in the future.

Signed-off-by: Caesar Wang <wxt@rock-chips.com>
Cc: Zhang Rui <rui.zhang@intel.com>
Cc: Eduardo Valentin <edubezval@gmail.com>
Cc: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
hifive-unleashed-5.1
Caesar Wang 2016-04-18 11:35:58 +08:00 committed by Eduardo Valentin
parent 1cd6026937
commit 678065d5b7
1 changed files with 53 additions and 21 deletions
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74
drivers/thermal/rockchip_thermal.c
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@ -1,7 +1,5 @@
/*
* Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
*
* Copyright (c) 2015, Fuzhou Rockchip Electronics Co., Ltd
* Copyright (c) 2014-2016, Fuzhou Rockchip Electronics Co., Ltd
* Caesar Wang <wxt@rock-chips.com>
*
* This program is free software; you can redistribute it and/or modify it
@ -75,7 +73,7 @@ enum adc_sort_mode {
#define SOC_MAX_SENSORS 2
/**
* struct chip_tsadc_table: hold information about chip-specific differences
* struct chip_tsadc_table - hold information about chip-specific differences
* @id: conversion table
* @length: size of conversion table
* @data_mask: mask to apply on data inputs
@ -88,6 +86,20 @@ struct chip_tsadc_table {
enum adc_sort_mode mode;
};
/**
* struct rockchip_tsadc_chip - hold the private data of tsadc chip
* @chn_id[SOC_MAX_SENSORS]: the sensor id of chip correspond to the channel
* @chn_num: the channel number of tsadc chip
* @tshut_temp: the hardware-controlled shutdown temperature value
* @tshut_mode: the hardware-controlled shutdown mode (0:CRU 1:GPIO)
* @tshut_polarity: the hardware-controlled active polarity (0:LOW 1:HIGH)
* @initialize: SoC special initialize tsadc controller method
* @irq_ack: clear the interrupt
* @get_temp: get the temperature
* @set_tshut_temp: set the hardware-controlled shutdown temperature
* @set_tshut_mode: set the hardware-controlled shutdown mode
* @table: the chip-specific conversion table
*/
struct rockchip_tsadc_chip {
/* The sensor id of chip correspond to the ADC channel */
int chn_id[SOC_MAX_SENSORS];
@ -115,12 +127,32 @@ struct rockchip_tsadc_chip {
struct chip_tsadc_table table;
};
/**
* struct rockchip_thermal_sensor - hold the information of thermal sensor
* @thermal: pointer to the platform/configuration data
* @tzd: pointer to a thermal zone
* @id: identifier of the thermal sensor
*/
struct rockchip_thermal_sensor {
struct rockchip_thermal_data *thermal;
struct thermal_zone_device *tzd;
int id;
};
/**
* struct rockchip_thermal_data - hold the private data of thermal driver
* @chip: pointer to the platform/configuration data
* @pdev: platform device of thermal
* @reset: the reset controller of tsadc
* @sensors[SOC_MAX_SENSORS]: the thermal sensor
* @clk: the controller clock is divided by the exteral 24MHz
* @pclk: the advanced peripherals bus clock
* @grf: the general register file will be used to do static set by software
* @regs: the base address of tsadc controller
* @tshut_temp: the hardware-controlled shutdown temperature value
* @tshut_mode: the hardware-controlled shutdown mode (0:CRU 1:GPIO)
* @tshut_polarity: the hardware-controlled active polarity (0:LOW 1:HIGH)
*/
struct rockchip_thermal_data {
const struct rockchip_tsadc_chip *chip;
struct platform_device *pdev;
@ -160,12 +192,7 @@ struct rockchip_thermal_data {
#define TSADCV2_AUTO_EN BIT(0)
#define TSADCV2_AUTO_SRC_EN(chn) BIT(4 + (chn))
#define TSADCV2_AUTO_TSHUT_POLARITY_HIGH BIT(8)
/**
* TSADCV1_AUTO_Q_SEL_EN:
* whether select (1024 - tsadc_q) as output
* 1'b0:use tsadc_q as output(temperature-code is rising sequence)
* 1'b1:use(1024 - tsadc_q) as output (temperature-code is falling sequence)
*/
#define TSADCV3_AUTO_Q_SEL_EN BIT(1)
#define TSADCV2_INT_SRC_EN(chn) BIT(chn)
@ -193,18 +220,21 @@ struct rockchip_thermal_data {
#define GRF_SARADC_TESTBIT_ON (0x10001 << 2)
#define GRF_TSADC_TESTBIT_H_ON (0x10001 << 2)
/**
* struct tsadc_table - code to temperature conversion table
* @code: the value of adc channel
* @temp: the temperature
* Note:
* code to temperature mapping of the temperature sensor is a piece wise linear
* curve.Any temperature, code faling between to 2 give temperatures can be
* linearly interpolated.
* Code to Temperature mapping should be updated based on manufacturer results.
*/
struct tsadc_table {
u32 code;
int temp;
};
/**
* Note:
* Code to Temperature mapping of the Temperature sensor is a piece wise linear
* curve.Any temperature, code faling between to 2 give temperatures can be
* linearly interpolated.
* Code to Temperature mapping should be updated based on sillcon results.
*/
static const struct tsadc_table rk3228_code_table[] = {
{0, -40000},
{588, -40000},
@ -490,6 +520,7 @@ static void rk_tsadcv2_initialize(struct regmap *grf, void __iomem *regs,
/**
* rk_tsadcv3_initialize - initialize TASDC Controller.
*
* (1) The tsadc control power sequence.
*
* (2) Set TSADC_V2_AUTO_PERIOD:
@ -568,10 +599,11 @@ static void rk_tsadcv2_control(void __iomem *regs, bool enable)
}
/**
* @rk_tsadcv3_control:
* TSADC controller works at auto mode, and some SoCs need set the tsadc_q_sel
* bit on TSADCV2_AUTO_CON[1]. The (1024 - tsadc_q) as output adc value if
* setting this bit to enable.
* rk_tsadcv3_control - the tsadc controller is enabled or disabled.
*
* NOTE: TSADC controller works at auto mode, and some SoCs need set the
* tsadc_q_sel bit on TSADCV2_AUTO_CON[1]. The (1024 - tsadc_q) as output
* adc value if setting this bit to enable.
*/
static void rk_tsadcv3_control(void __iomem *regs, bool enable)
{