[PATCH v7 1/5] thermal: rockchip: add driver for thermal
Caesar Wang
caesar.wang at rock-chips.com
Wed Oct 8 00:29:40 PDT 2014
Dear Dmitry,
在 2014年10月08日 07:39, Dmitry Torokhov 写道:
> Hi Caesar,
>
> On Sun, Sep 28, 2014 at 06:38:09PM +0800, Caesar Wang wrote:
>> Thermal is TS-ADC Controller module supports
>> user-defined mode and automatic mode.
>>
>> User-defined mode refers,TSADC all the control signals entirely by
>> software writing to register for direct control.
>>
>> Automaic mode refers to the module automatically poll TSADC output,
>> and the results were checked.If you find that the temperature High
>> in a period of time,an interrupt is generated to the processor
>> down-measures taken;If the temperature over a period of time High,
>> the resulting TSHUT gave CRU module,let it reset the entire chip,
>> or via GPIO give PMIC.
>>
>> Signed-off-by: zhaoyifeng <zyf at rock-chips.com>
>> Signed-off-by: Caesar Wang <caesar.wang at rock-chips.com>
>> ---
>> drivers/thermal/Kconfig | 10 +
>> drivers/thermal/Makefile | 1 +
>> drivers/thermal/rockchip_thermal.c | 608 +++++++++++++++++++++++++++++++++++++
>> 3 files changed, 619 insertions(+)
>> create mode 100644 drivers/thermal/rockchip_thermal.c
>>
>> diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
>> index f9a1386..84f3fc0 100644
>> --- a/drivers/thermal/Kconfig
>> +++ b/drivers/thermal/Kconfig
>> @@ -133,6 +133,16 @@ config SPEAR_THERMAL
>> Enable this to plug the SPEAr thermal sensor driver into the Linux
>> thermal framework.
>>
>> +config ROCKCHIP_THERMAL
>> + tristate "Rockchip thermal driver"
>> + depends on ARCH_ROCKCHIP
>> + help
>> + Rockchip thermal driver provides support for Temperature sensor
>> + ADC (TS-ADC) found on Rockchip SoCs. It supports one critical
>> + trip point and one passive trip point. Cpufreq is used as the
>> + cooling device and will throttle CPUs when the Temperature
>> + crosses the passive trip point.
>> +
>> config RCAR_THERMAL
>> tristate "Renesas R-Car thermal driver"
>> depends on ARCH_SHMOBILE || COMPILE_TEST
>> diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
>> index de0636a..930554f 100644
>> --- a/drivers/thermal/Makefile
>> +++ b/drivers/thermal/Makefile
>> @@ -19,6 +19,7 @@ thermal_sys-$(CONFIG_CPU_THERMAL) += cpu_cooling.o
>>
>> # platform thermal drivers
>> obj-$(CONFIG_SPEAR_THERMAL) += spear_thermal.o
>> +obj-$(CONFIG_ROCKCHIP_THERMAL) += rockchip_thermal.o
>> obj-$(CONFIG_RCAR_THERMAL) += rcar_thermal.o
>> obj-$(CONFIG_KIRKWOOD_THERMAL) += kirkwood_thermal.o
>> obj-y += samsung/
>> diff --git a/drivers/thermal/rockchip_thermal.c b/drivers/thermal/rockchip_thermal.c
>> new file mode 100644
>> index 0000000..9e3e8e8
>> --- /dev/null
>> +++ b/drivers/thermal/rockchip_thermal.c
>> @@ -0,0 +1,608 @@
>> +/*
>> + * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
>> + *
>> + * This program is free software; you can redistribute it and/or modify it
>> + * under the terms and conditions of the GNU General Public License,
>> + * version 2, as published by the Free Software Foundation.
>> + *
>> + * This program is distributed in the hope it will be useful, but WITHOUT
>> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
>> + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
>> + * more details.
>> + */
>> +
>> +#include <linux/clk.h>
>> +#include <linux/gpio/consumer.h>
>> +#include <linux/io.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/module.h>
>> +#include <linux/of.h>
>> +#include <linux/of_address.h>
>> +#include <linux/of_irq.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/regulator/consumer.h>
>> +#include <linux/cpu_cooling.h>
>> +#include <linux/thermal.h>
>> +
>> +struct rockchip_thermal_data {
>> + const struct rockchip_tsadc_platform_data *pdata;
>> + struct thermal_zone_device *tz;
>> + struct thermal_cooling_device *cdev;
>> + void __iomem *regs;
>> +
>> + unsigned long temp_passive;
>> + unsigned long temp_critical;
>> + unsigned long hw_shut_temp;
>> + unsigned long alarm_temp;
>> + unsigned long last_temp;
>> + bool irq_enabled;
>> + int irq;
>> +
>> + struct clk *clk;
>> + struct clk *pclk;
>> + struct gpio_desc *reset_gpio;
>> +};
>> +
>> +struct rockchip_tsadc_platform_data {
>> + u8 irq_en;
>> + unsigned long hw_shut_temp;
>> +
>> + int (*irq_handle)(void __iomem *reg);
>> + int (*initialize)(void __iomem *reg, unsigned long hw_shut_temp);
>> + int (*control)(void __iomem *reg, bool on);
>> + int (*code_to_temp)(u32 code);
>> + u32 (*temp_to_code)(int temp);
>> + void (*set_alarm_temp)(void __iomem *regs, unsigned long alarm_temp);
>> +};
>> +
>> +/* TSADC V2 Sensor info define: */
>> +#define TSADCV2_AUTO_CON 0x04
>> +#define TSADCV2_INT_EN 0x08
>> +#define TSADCV2_INT_PD 0x0c
>> +#define TSADCV2_DATA1 0x24
>> +#define TSADCV2_COMP1_INT 0x34
>> +#define TSADCV2_COMP1_SHUT 0x44
>> +#define TSADCV2_AUTO_PERIOD 0x68
>> +#define TSADCV2_AUTO_PERIOD_HT 0x6c
>> +
>> +#define TSADCV2_AUTO_SRC1_EN BIT(5)
>> +#define TSADCV2_AUTO_EN BIT(0)
>> +#define TSADCV2_AUTO_DISABLE ~BIT(0)
>> +#define TSADCV2_AUTO_STAS_BUSY BIT(16)
>> +#define TSADCV2_AUTO_STAS_BUSY_MASK BIT(16)
>> +#define TSADCV2_SHUT_2GPIO_SRC1_EN BIT(5)
>> +#define TSADCV2_INT_SRC1_EN BIT(1)
>> +#define TSADCV2_SHUT_SRC1_STATUS BIT(5)
>> +#define TSADCV2_INT_SRC1_STATUS BIT(1)
>> +#define TSADCV2_INT_PD_CLEAR ~BIT(8)
>> +
>> +#define TSADCV2_DATA_MASK 0xfff
>> +#define TSADCV2_HIGHT_INT_DEBOUNCE 0x60
>> +#define TSADCV2_HIGHT_TSHUT_DEBOUNCE 0x64
>> +#define TSADCV2_HIGHT_INT_DEBOUNCE_TIME 0x0a
>> +#define TSADCV2_HIGHT_TSHUT_DEBOUNCE_TIME 0x0a
>> +#define TSADCV2_AUTO_PERIOD_TIME 0x03e8
>> +#define TSADCV2_AUTO_PERIOD_HT_TIME 0x64
>> +
>> +struct tsadc_table {
>> + unsigned long code;
>> + int temp;
>> +};
>> +
>> +static const struct tsadc_table v2_code_table[] = {
>> + {TSADCV2_DATA_MASK, -40000},
>> + {3800, -40000},
>> + {3792, -35000},
>> + {3783, -30000},
>> + {3774, -25000},
>> + {3765, -20000},
>> + {3756, -15000},
>> + {3747, -10000},
>> + {3737, -5000},
>> + {3728, 0},
>> + {3718, 5000},
>> + {3708, 10000},
>> + {3698, 15000},
>> + {3688, 20000},
>> + {3678, 25000},
>> + {3667, 30000},
>> + {3656, 35000},
>> + {3645, 40000},
>> + {3634, 45000},
>> + {3623, 50000},
>> + {3611, 55000},
>> + {3600, 60000},
>> + {3588, 65000},
>> + {3575, 70000},
>> + {3563, 75000},
>> + {3550, 80000},
>> + {3537, 85000},
>> + {3524, 90000},
>> + {3510, 95000},
>> + {3496, 100000},
>> + {3482, 105000},
>> + {3467, 110000},
>> + {3452, 115000},
>> + {3437, 120000},
>> + {3421, 125000},
>> + {0, 125000},
>> +};
>> +
>> +static int rk_tsadcv2_irq_handle(void __iomem *regs)
>> +{
>> + u32 val;
>> +
>> + val = readl_relaxed(regs + TSADCV2_INT_PD);
>> + writel_relaxed(val & TSADCV2_INT_PD_CLEAR, regs + TSADCV2_INT_PD);
>> +
>> + return 0;
>> +}
>> +
>> +static u32 rk_tsadcv2_temp_to_code(int temp)
>> +{
>> + int high, low, mid, ret = 0;
>> +
>> + low = 0;
>> + high = ARRAY_SIZE(v2_code_table) - 1;
>> + mid = (high + low) / 2;
>> +
>> + if (temp < v2_code_table[low].temp || temp > v2_code_table[high].temp) {
>> + ret = -ERANGE;
>> + goto exit;
>> + }
>> +
>> + while (low <= high) {
>> + if (temp == v2_code_table[mid].temp)
>> + return v2_code_table[mid].code;
>> + else if (temp < v2_code_table[mid].temp)
>> + high = mid - 1;
>> + else
>> + low = mid + 1;
>> + mid = (low + high) / 2;
>> + }
>> +
>> + return 0;
>> +
>> +exit:
>> + return ret;
>> +}
>> +
>> +static int rk_tsadcv2_code_to_temp(u32 code)
>> +{
>> + int i;
>> +
>> + for (i = 0; i < ARRAY_SIZE(v2_code_table) - 1; i++) {
>> + if (code >= v2_code_table[i].code)
>> + return v2_code_table[i].temp;
>> + }
>> +
>> + /* No code available,return max temperture */
>> + return 125000;
>> +}
>> +
>> +static int rk_tsadcv2_initialize(void __iomem *regs,
>> + unsigned long hw_shut_temp)
>> +{
>> + u32 shutdown_value;
>> +
>> + shutdown_value = rk_tsadcv2_temp_to_code(hw_shut_temp);
>> +
>> + /* Enable measurements at ~ 10 Hz */
>> + writel_relaxed(0, regs + TSADCV2_AUTO_CON);
>> + writel_relaxed(TSADCV2_AUTO_PERIOD_TIME, regs + TSADCV2_AUTO_PERIOD);
>> + writel_relaxed(TSADCV2_AUTO_PERIOD_HT_TIME, regs +
>> + TSADCV2_AUTO_PERIOD_HT);
>> + writel_relaxed(shutdown_value, regs + TSADCV2_COMP1_SHUT);
>> + writel_relaxed(TSADCV2_HIGHT_INT_DEBOUNCE_TIME, regs +
>> + TSADCV2_HIGHT_INT_DEBOUNCE);
>> + writel_relaxed(TSADCV2_HIGHT_TSHUT_DEBOUNCE_TIME, regs +
>> + TSADCV2_HIGHT_TSHUT_DEBOUNCE);
>> + writel_relaxed(TSADCV2_SHUT_2GPIO_SRC1_EN | TSADCV2_INT_SRC1_EN, regs +
>> + TSADCV2_INT_EN);
>> + writel_relaxed(TSADCV2_AUTO_SRC1_EN | TSADCV2_AUTO_EN, regs +
>> + TSADCV2_AUTO_CON);
>> +
>> + return 0;
>> +}
>> +
>> +static int rk_tsadcv2_control(void __iomem *regs, bool on)
>> +{
>> + u32 val;
>> +
>> + if (on) {
>> + val = readl_relaxed(regs + TSADCV2_AUTO_CON);
>> + writel_relaxed(val | TSADCV2_AUTO_EN, regs + TSADCV2_AUTO_CON);
>> + } else {
>> + val = readl_relaxed(regs + TSADCV2_AUTO_CON);
>> + writel_relaxed(val & TSADCV2_AUTO_DISABLE,
>> + regs + TSADCV2_AUTO_CON);
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static void rk_tsadcv2_alarm_temp(void __iomem *regs, unsigned long alarm_temp)
>> +{
>> + u32 alarm_value;
>> +
>> + alarm_value = rk_tsadcv2_temp_to_code(alarm_temp);
>> +
>> + writel_relaxed(alarm_value, regs + TSADCV2_COMP1_INT);
>> +}
>> +
>> +static const struct rockchip_tsadc_platform_data rk3288_tsadc_data = {
>> + .irq_en = 1,
>> + .hw_shut_temp = 115000,
>> + .irq_handle = rk_tsadcv2_irq_handle,
>> + .initialize = rk_tsadcv2_initialize,
>> + .control = rk_tsadcv2_control,
>> + .code_to_temp = rk_tsadcv2_code_to_temp,
>> + .temp_to_code = rk_tsadcv2_temp_to_code,
>> + .set_alarm_temp = rk_tsadcv2_alarm_temp,
>> +};
>> +
>> +static const struct of_device_id of_rockchip_thermal_match[] = {
>> + {
>> + .compatible = "rockchip,rk3288-tsadc",
>> + .data = (void *)&rk3288_tsadc_data,
>> + },
>> + { /* end */ },
>> +};
>> +MODULE_DEVICE_TABLE(of, of_rockchip_thermal_match);
>> +
>> +static void rockchip_set_alarm_temp(struct rockchip_thermal_data *data,
>> + int alarm_temp)
>> +{
>> + const struct rockchip_tsadc_platform_data *p_tsadc_data = data->pdata;
>> +
>> + data->alarm_temp = alarm_temp;
>> + if (p_tsadc_data->set_alarm_temp)
>> + p_tsadc_data->set_alarm_temp(data->regs, alarm_temp);
>> +}
>> +
>> +static int rockchip_thermal_initialize(struct rockchip_thermal_data *data)
>> +{
>> + const struct rockchip_tsadc_platform_data *p_tsadc_data = data->pdata;
>> +
>> + if (p_tsadc_data->initialize)
>> + p_tsadc_data->initialize(data->regs, data->hw_shut_temp);
>> + rockchip_set_alarm_temp(data, data->temp_passive);
>> +
>> + return 0;
>> +}
>> +
>> +static void rockchip_thermal_control(struct rockchip_thermal_data *data,
>> + bool on)
>> +{
>> + const struct rockchip_tsadc_platform_data *p_tsadc_data = data->pdata;
>> +
>> + if (p_tsadc_data->control)
>> + p_tsadc_data->control(data->regs, on);
>> +
>> + if (on) {
>> + data->irq_enabled = true;
>> + data->tz->ops->set_mode(data->tz, THERMAL_DEVICE_ENABLED);
>> + } else {
>> + data->irq_enabled = false;
>> + data->tz->ops->set_mode(data->tz, THERMAL_DEVICE_DISABLED);
>> + }
>> +}
>> +
>> +static irqreturn_t rockchip_thermal_alarm_irq_thread(int irq, void *dev)
>> +{
>> + struct rockchip_thermal_data *data = dev;
>> + const struct rockchip_tsadc_platform_data *p_tsadc_data = data->pdata;
>> +
>> + unsigned long current_temp;
>> + int err;
>> +
>> + dev_dbg(&data->tz->device, "THERMAL ALARM: T > %lu\n",
>> + data->alarm_temp / 1000);
>> +
>> + if (p_tsadc_data->irq_en && p_tsadc_data->irq_handle)
>> + p_tsadc_data->irq_handle(data->regs);
>> +
>> + thermal_zone_device_update(data->tz);
>> +
>> + /* Ensure to over shutdown temp after irq be generated */
>> + err = data->tz->ops->get_temp(data->tz, ¤t_temp);
>> + if (err)
>> + return err;
>> +
>> + if (current_temp > data->hw_shut_temp) {
>> + dev_info(&data->tz->device, "over temp restarting...\n");
>> + gpiod_direction_output(data->reset_gpio, 1);
>> + }
> I am a bit confused with the purpose of data->hw_shut_temp. We first
> write it as a shutdown value during initialization (which I assume will
> cause hardware to shut off immediately). We also set an alarm with it
> and toggle reset ping if defined. On top of that, if I read this
> correctly) we have generic thermal code issuing shutdown when critical
> trip point is reached. This seems like 2 ways too many of handling the
> shut off.
I'm rewriting it.
I will remove "reset-gpios", and the about way is not need.
> Also it seems that we fetch data->temp_critical from DT but never use
> it.
>
> Can we say that we define safeguard value (hardcoded, not a DT properly)
> that causes immediate thermal shutdown via hardware, and let generic
> framework continue orderly shutting down if we trip over critical point?
>
> This way rockchip_thermal_alarm_irq_thread() will only need to ack the
> interrupt and call thermal_zone_device_update(data->tz);
>
>> +
>> + return IRQ_HANDLED;
>> +}
>> +
>> +static int rockchip_thermal_get_temp(void *zone, long *out_temp)
>> +{
>> + struct rockchip_thermal_data *data = zone;
>> + const struct rockchip_tsadc_platform_data *p_tsadc_data = data->pdata;
>> + u32 val;
>> +
>> + val = readl_relaxed(data->regs + TSADCV2_DATA1);
>> + if (val == 0)
>> + return -EPROBE_DEFER;
>> +
>> + *out_temp = p_tsadc_data->code_to_temp(val);
>> +
>> + /* Update alarm value to next higher trip point */
>> + if (data->alarm_temp == data->temp_passive && *out_temp >=
>> + data->temp_passive)
>> + rockchip_set_alarm_temp(data, data->hw_shut_temp);
>> +
>> + if (data->alarm_temp == data->temp_passive && *out_temp <
>> + data->temp_passive) {
>> + rockchip_set_alarm_temp(data, data->temp_passive);
>> + dev_dbg(&data->tz->device, "thermal alarm off: T < %lu\n",
>> + data->alarm_temp / 1000);
>> + }
>> +
>> + if (*out_temp != data->last_temp) {
>> + dev_dbg(&data->tz->device, "millicelsius: %ld\n", *out_temp);
>> + data->last_temp = *out_temp;
>> + }
>> +
>> + /* Reenable alarm IRQ if temperature below alarm temperature */
>> + if (!data->irq_enabled && *out_temp < data->alarm_temp) {
>> + data->irq_enabled = true;
>> + enable_irq(data->irq);
>> + }
> I think instead of changing alarm settings here we should be doing it in
> the set_trips() callback. Also, it seems that we are resetting the alarm
> once temperature subsides, but should not we advance alarm to the next
> trip point as temperature is rising (in case it raises too fast compared
> to our polling frequency)?
>
> Thanks.
Hmmm, Maybe I should fix it as the follows:
static int rockchip_thermal_set_trips(void *zone, long low, long high)
{
struct rockchip_thermal_data *data = zone;
const struct rockchip_tsadc_platform_data *tsadc = data->pdata;
u32 val;
long *out_temp;
low = clamp_val(low, LONG_MIN, LONG_MAX);
high = clamp_val(high, LONG_MIN, LONG_MAX);
val = readl_relaxed(data->regs + TSADCV2_DATA(tsadc->chn));
if (val == 0)
return -EPROBE_DEFER;
*out_temp = tsadc->code_to_temp(val);
/* Update alarm value to next higher TSHUT trip point */
if (data->alarm_temp == data->temp_passive && *out_temp >=
data->temp_passive)
high = data->hw_shut_temp;
if (data->alarm_temp >= data->temp_passive && *out_temp <
data->temp_passive) {
dev_dbg(&data->tz->device, "thermal alarm off: T < %lu\n",
data->alarm_temp / 1000);
high = data->temp_passive;
}
return 0;
}
....
and set TSHUT temperture into
thermal_zone_of_sensor_register(...,rockchip_thermal_set_trips)
--
Best regards,
Caesar
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