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Date: Fri, 21 Jun 2013 18:16:03 +0530
From: amit daniel kachhap <amit.daniel@...sung.com>
To: Eduardo Valentin <eduardo.valentin@...com>
Cc: linux-pm@...r.kernel.org, Zhang Rui <rui.zhang@...el.com>,
linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
Kukjin Kim <kgene.kim@...sung.com>, jonghwa3.lee@...sung.com
Subject: Re: [PATCH V6 18/30] thermal: exynos: Add support to handle many
instances of TMU
Hi Eduardo,
On Thu, Jun 20, 2013 at 4:57 AM, Eduardo Valentin
<eduardo.valentin@...com> wrote:
> On 17-06-2013 02:46, Amit Daniel Kachhap wrote:
>> This patch adds support to handle multiple instances of the TMU controllers.
>> This is done by removing the static structure to register with the core thermal
>> and creating it dynamically for each instance of the TMU controller. The
>> interrupt is made shared type to handle shared interrupts. Also
>> the identifier of the TMU controller is extracted from device tree alias.
>>
>> Acked-by: Kukjin Kim <kgene.kim@...sung.com>
>> Acked-by: Jonghwa Lee <jonghwa3.lee@...sung.com>
>> Signed-off-by: Amit Daniel Kachhap <amit.daniel@...sung.com>
>> ---
>> drivers/thermal/samsung/exynos_thermal_common.h | 1 +
>> drivers/thermal/samsung/exynos_tmu.c | 147 ++++++++++++++++-------
>> drivers/thermal/samsung/exynos_tmu.h | 13 ++
>> drivers/thermal/samsung/exynos_tmu_data.c | 145 ++++++++++++----------
>> drivers/thermal/samsung/exynos_tmu_data.h | 4 +-
>> 5 files changed, 197 insertions(+), 113 deletions(-)
>>
>> diff --git a/drivers/thermal/samsung/exynos_thermal_common.h b/drivers/thermal/samsung/exynos_thermal_common.h
>> index dd0077e..0c189d6 100644
>> --- a/drivers/thermal/samsung/exynos_thermal_common.h
>> +++ b/drivers/thermal/samsung/exynos_thermal_common.h
>> @@ -84,6 +84,7 @@ struct thermal_sensor_conf {
>> struct thermal_cooling_conf cooling_data;
>> void *driver_data;
>> void *pzone_data;
>> + struct device *dev;
>> };
>>
>> /*Functions used exynos based thermal sensor driver*/
>> diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c
>> index 4356118..1880c4e 100644
>> --- a/drivers/thermal/samsung/exynos_tmu.c
>> +++ b/drivers/thermal/samsung/exynos_tmu.c
>> @@ -26,15 +26,32 @@
>> #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 "exynos_thermal_common.h"
>> #include "exynos_tmu.h"
>> #include "exynos_tmu_data.h"
>>
>> +/**
>> + * struct exynos_tmu_data : A structure to hold the private data of the TMU
>> + driver
>> + * @id: identifier of the one instance of the TMU controller.
>> + * @pdata: pointer to the tmu platform/configuration data
>> + * @base: base address of the single instance of the TMU controller.
>> + * @irq: irq number of the TMU controller.
>> + * @soc: id of the SOC type.
>> + * @irq_work: pointer to the irq work structure.
>> + * @lock: lock to implement synchronization.
>> + * @clk: pointer to the clock structure.
>> + * @temp_error1: fused value of the first point trim.
>> + * @temp_error2: fused value of the second point trim.
>> + * @reg_conf: pointer to structure to register with core thermal.
>> + */
>> struct exynos_tmu_data {
>> + int id;
>> struct exynos_tmu_platform_data *pdata;
>> - struct resource *mem;
>> void __iomem *base;
>> int irq;
>> enum soc_type soc;
>> @@ -42,6 +59,7 @@ struct exynos_tmu_data {
>> struct mutex lock;
>> struct clk *clk;
>> u8 temp_error1, temp_error2;
>> + struct thermal_sensor_conf *reg_conf;
>> };
>>
>> /*
>> @@ -345,12 +363,6 @@ static int exynos_tmu_set_emulation(void *drv_data, unsigned long temp)
>> { return -EINVAL; }
>> #endif/*CONFIG_THERMAL_EMULATION*/
>>
>> -static struct thermal_sensor_conf exynos_sensor_conf = {
>> - .name = "exynos-therm",
>> - .read_temperature = (int (*)(void *))exynos_tmu_read,
>> - .write_emul_temp = exynos_tmu_set_emulation,
>> -};
>> -
>> static void exynos_tmu_work(struct work_struct *work)
>> {
>> struct exynos_tmu_data *data = container_of(work,
>> @@ -359,7 +371,7 @@ static void exynos_tmu_work(struct work_struct *work)
>> const struct exynos_tmu_registers *reg = pdata->registers;
>> unsigned int val_irq;
>>
>> - exynos_report_trigger(&exynos_sensor_conf);
>> + exynos_report_trigger(data->reg_conf);
>> mutex_lock(&data->lock);
>> clk_enable(data->clk);
>>
>> @@ -404,33 +416,73 @@ MODULE_DEVICE_TABLE(of, exynos_tmu_match);
>> #endif
>>
>> static inline struct exynos_tmu_platform_data *exynos_get_driver_data(
>> - struct platform_device *pdev)
>> + struct platform_device *pdev, int id)
>> {
>> + struct exynos_tmu_init_data *data_table;
>> + struct exynos_tmu_platform_data *tmu_data;
>> #ifdef CONFIG_OF
>> if (pdev->dev.of_node) {
>> const struct of_device_id *match;
>> match = of_match_node(exynos_tmu_match, pdev->dev.of_node);
>> if (!match)
>> return NULL;
>> - return (struct exynos_tmu_platform_data *) match->data;
>> + data_table = (struct exynos_tmu_init_data *) match->data;
>> + if (!data_table || id >= data_table->tmu_count)
>> + return NULL;
>> + tmu_data = data_table->tmu_data;
>> + return (struct exynos_tmu_platform_data *) (tmu_data + id);
>> }
>> #endif
>> return NULL;
>> }
>>
>> -static int exynos_tmu_probe(struct platform_device *pdev)
>> +static int exynos_map_dt_data(struct platform_device *pdev)
>> {
>> - struct exynos_tmu_data *data;
>> - struct exynos_tmu_platform_data *pdata = pdev->dev.platform_data;
>> - int ret, i;
>> + struct exynos_tmu_data *data = platform_get_drvdata(pdev);
>> + struct exynos_tmu_platform_data *pdata;
>> + struct resource res;
>>
>> - if (!pdata)
>> - pdata = exynos_get_driver_data(pdev);
>> + if (!data)
>> + return -ENODEV;
>> +
>> + data->id = of_alias_get_id(pdev->dev.of_node, "tmuctrl");
>> + if (data->id < 0)
>> + data->id = 0;
>>
>> + data->irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
>> + if (data->irq <= 0) {
>> + dev_err(&pdev->dev, "failed to get IRQ\n");
>> + return -ENODEV;
>> + }
>> +
>> + if (of_address_to_resource(pdev->dev.of_node, 0, &res)) {
>> + dev_err(&pdev->dev, "failed to get Resource 0\n");
>> + return -ENODEV;
>> + }
>> +
>> + data->base = devm_ioremap(&pdev->dev, res.start, resource_size(&res));
>> + if (!data->base) {
>> + dev_err(&pdev->dev, "Failed to ioremap memory\n");
>> + return -EADDRNOTAVAIL;
>> + }
>> +
>> + pdata = exynos_get_driver_data(pdev, data->id);
>> if (!pdata) {
>> dev_err(&pdev->dev, "No platform init data supplied.\n");
>> return -ENODEV;
>> }
>> + data->pdata = pdata;
>> +
>> + return 0;
>> +}
>> +
>> +static int exynos_tmu_probe(struct platform_device *pdev)
>> +{
>> + struct exynos_tmu_data *data;
>> + struct exynos_tmu_platform_data *pdata;
>> + struct thermal_sensor_conf *sensor_conf;
>> + int ret, i;
>> +
>> data = devm_kzalloc(&pdev->dev, sizeof(struct exynos_tmu_data),
>> GFP_KERNEL);
>> if (!data) {
>> @@ -438,21 +490,18 @@ static int exynos_tmu_probe(struct platform_device *pdev)
>> return -ENOMEM;
>> }
>>
>> - data->irq = platform_get_irq(pdev, 0);
>> - if (data->irq < 0) {
>> - dev_err(&pdev->dev, "Failed to get platform irq\n");
>> - return data->irq;
>> - }
>> + platform_set_drvdata(pdev, data);
>> + mutex_init(&data->lock);
>>
>> - INIT_WORK(&data->irq_work, exynos_tmu_work);
>> + ret = exynos_map_dt_data(pdev);
>> + if (ret)
>> + return ret;
>>
>> - data->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> - data->base = devm_ioremap_resource(&pdev->dev, data->mem);
>> - if (IS_ERR(data->base))
>> - return PTR_ERR(data->base);
>> + pdata = data->pdata;
>>
>> + INIT_WORK(&data->irq_work, exynos_tmu_work);
>> ret = devm_request_irq(&pdev->dev, data->irq, exynos_tmu_irq,
>> - IRQF_TRIGGER_RISING, "exynos-tmu", data);
>> + IRQF_TRIGGER_RISING | IRQF_SHARED, dev_name(&pdev->dev), data);
>
> Lets think about this poing: You request the IRQ before data->reg_conf
> is allocated (below). Does it mean, from this point you can get called
> to the IRQ handler even if reg_conf is not set? What happens then? I see
> your irqhandler/worker use it.
Good catch. Will put a check in the IRQ handler.
Thanks,
Amit Daniel
>
>> if (ret) {
>> dev_err(&pdev->dev, "Failed to request irq: %d\n", data->irq);
>> return ret;
>> @@ -477,10 +526,6 @@ static int exynos_tmu_probe(struct platform_device *pdev)
>> goto err_clk;
>> }
>>
>> - data->pdata = pdata;
>> - platform_set_drvdata(pdev, data);
>> - mutex_init(&data->lock);
>> -
>> ret = exynos_tmu_initialize(pdev);
>> if (ret) {
>> dev_err(&pdev->dev, "Failed to initialize TMU\n");
>> @@ -489,31 +534,43 @@ static int exynos_tmu_probe(struct platform_device *pdev)
>>
>> exynos_tmu_control(pdev, true);
>>
>> - /* Register the sensor with thermal management interface */
>> - (&exynos_sensor_conf)->driver_data = data;
>> - exynos_sensor_conf.trip_data.trip_count = pdata->trigger_enable[0] +
>> + /* Allocate a structure to register with the exynos core thermal */
>> + sensor_conf = devm_kzalloc(&pdev->dev,
>> + sizeof(struct thermal_sensor_conf), GFP_KERNEL);
>> + if (!sensor_conf) {
>> + dev_err(&pdev->dev, "Failed to allocate registration struct\n");
>> + ret = -ENOMEM;
>> + goto err_clk;
>> + }
>> + data->reg_conf = sensor_conf;
>> + sprintf(sensor_conf->name, "therm_zone%d", data->id);
>> + sensor_conf->read_temperature = (int (*)(void *))exynos_tmu_read;
>> + sensor_conf->write_emul_temp =
>> + (int (*)(void *, unsigned long))exynos_tmu_set_emulation;
>> + sensor_conf->driver_data = data;
>> + sensor_conf->trip_data.trip_count = pdata->trigger_enable[0] +
>> pdata->trigger_enable[1] + pdata->trigger_enable[2]+
>> pdata->trigger_enable[3];
>>
>> - for (i = 0; i < exynos_sensor_conf.trip_data.trip_count; i++) {
>> - exynos_sensor_conf.trip_data.trip_val[i] =
>> + for (i = 0; i < sensor_conf->trip_data.trip_count; i++) {
>> + sensor_conf->trip_data.trip_val[i] =
>> pdata->threshold + pdata->trigger_levels[i];
>> - exynos_sensor_conf.trip_data.trip_type[i] =
>> + sensor_conf->trip_data.trip_type[i] =
>> pdata->trigger_type[i];
>> }
>>
>> - exynos_sensor_conf.trip_data.trigger_falling = pdata->threshold_falling;
>> + sensor_conf->trip_data.trigger_falling = pdata->threshold_falling;
>>
>> - exynos_sensor_conf.cooling_data.freq_clip_count =
>> - pdata->freq_tab_count;
>> + sensor_conf->cooling_data.freq_clip_count = pdata->freq_tab_count;
>> for (i = 0; i < pdata->freq_tab_count; i++) {
>> - exynos_sensor_conf.cooling_data.freq_data[i].freq_clip_max =
>> + sensor_conf->cooling_data.freq_data[i].freq_clip_max =
>> pdata->freq_tab[i].freq_clip_max;
>> - exynos_sensor_conf.cooling_data.freq_data[i].temp_level =
>> + sensor_conf->cooling_data.freq_data[i].temp_level =
>> pdata->freq_tab[i].temp_level;
>> }
>> -
>> - ret = exynos_register_thermal(&exynos_sensor_conf);
>> + sensor_conf->dev = &pdev->dev;
>> + /* Register the sensor with thermal management interface */
>> + ret = exynos_register_thermal(sensor_conf);
>> if (ret) {
>> dev_err(&pdev->dev, "Failed to register thermal interface\n");
>> goto err_clk;
>> @@ -531,7 +588,7 @@ static int exynos_tmu_remove(struct platform_device *pdev)
>>
>> exynos_tmu_control(pdev, false);
>>
>> - exynos_unregister_thermal(&exynos_sensor_conf);
>> + exynos_unregister_thermal(data->reg_conf);
>>
>> clk_unprepare(data->clk);
>>
>> diff --git a/drivers/thermal/samsung/exynos_tmu.h b/drivers/thermal/samsung/exynos_tmu.h
>> index 619a34c..b614407 100644
>> --- a/drivers/thermal/samsung/exynos_tmu.h
>> +++ b/drivers/thermal/samsung/exynos_tmu.h
>> @@ -248,4 +248,17 @@ struct exynos_tmu_platform_data {
>> unsigned int freq_tab_count;
>> const struct exynos_tmu_registers *registers;
>> };
>> +
>> +/**
>> + * struct exynos_tmu_init_data
>> + * @tmu_count: number of TMU instances.
>> + * @tmu_data: platform data of all TMU instances.
>> + * This structure is required to store data for multi-instance exynos tmu
>> + * driver.
>> + */
>> +struct exynos_tmu_init_data {
>> + int tmu_count;
>> + struct exynos_tmu_platform_data tmu_data[];
>> +};
>> +
>> #endif /* _EXYNOS_TMU_H */
>> diff --git a/drivers/thermal/samsung/exynos_tmu_data.c b/drivers/thermal/samsung/exynos_tmu_data.c
>> index 7fcf183..06ecfb0 100644
>> --- a/drivers/thermal/samsung/exynos_tmu_data.c
>> +++ b/drivers/thermal/samsung/exynos_tmu_data.c
>> @@ -48,38 +48,44 @@ static const struct exynos_tmu_registers exynos4210_tmu_registers = {
>> .tmu_intstat = EXYNOS_TMU_REG_INTSTAT,
>> .tmu_intclear = EXYNOS_TMU_REG_INTCLEAR,
>> };
>> -struct exynos_tmu_platform_data const exynos4210_default_tmu_data = {
>> - .threshold = 80,
>> - .trigger_levels[0] = 5,
>> - .trigger_levels[1] = 20,
>> - .trigger_levels[2] = 30,
>> - .trigger_enable[0] = 1,
>> - .trigger_enable[1] = 1,
>> - .trigger_enable[2] = 1,
>> - .trigger_enable[3] = 0,
>> - .trigger_type[0] = THROTTLE_ACTIVE,
>> - .trigger_type[1] = THROTTLE_ACTIVE,
>> - .trigger_type[2] = SW_TRIP,
>> - .max_trigger_level = 4,
>> - .gain = 15,
>> - .reference_voltage = 7,
>> - .cal_type = TYPE_ONE_POINT_TRIMMING,
>> - .min_efuse_value = 40,
>> - .max_efuse_value = 100,
>> - .first_point_trim = 25,
>> - .second_point_trim = 85,
>> - .default_temp_offset = 50,
>> - .freq_tab[0] = {
>> - .freq_clip_max = 800 * 1000,
>> - .temp_level = 85,
>> - },
>> - .freq_tab[1] = {
>> - .freq_clip_max = 200 * 1000,
>> - .temp_level = 100,
>> +
>> +struct exynos_tmu_init_data const exynos4210_default_tmu_data = {
>> + .tmu_data = {
>> + {
>> + .threshold = 80,
>> + .trigger_levels[0] = 5,
>> + .trigger_levels[1] = 20,
>> + .trigger_levels[2] = 30,
>> + .trigger_enable[0] = 1,
>> + .trigger_enable[1] = 1,
>> + .trigger_enable[2] = 1,
>> + .trigger_enable[3] = 0,
>> + .trigger_type[0] = THROTTLE_ACTIVE,
>> + .trigger_type[1] = THROTTLE_ACTIVE,
>> + .trigger_type[2] = SW_TRIP,
>> + .max_trigger_level = 4,
>> + .gain = 15,
>> + .reference_voltage = 7,
>> + .cal_type = TYPE_ONE_POINT_TRIMMING,
>> + .min_efuse_value = 40,
>> + .max_efuse_value = 100,
>> + .first_point_trim = 25,
>> + .second_point_trim = 85,
>> + .default_temp_offset = 50,
>> + .freq_tab[0] = {
>> + .freq_clip_max = 800 * 1000,
>> + .temp_level = 85,
>> + },
>> + .freq_tab[1] = {
>> + .freq_clip_max = 200 * 1000,
>> + .temp_level = 100,
>> + },
>> + .freq_tab_count = 2,
>> + .type = SOC_ARCH_EXYNOS4210,
>> + .registers = &exynos4210_tmu_registers,
>> + },
>> },
>> - .freq_tab_count = 2,
>> - .type = SOC_ARCH_EXYNOS4210,
>> - .registers = &exynos4210_tmu_registers,
>> + .tmu_count = 1,
>> };
>> #endif
>>
>> @@ -120,41 +126,48 @@ static const struct exynos_tmu_registers exynos5250_tmu_registers = {
>> .emul_time_shift = EXYNOS_EMUL_TIME_SHIFT,
>> .emul_time_mask = EXYNOS_EMUL_TIME_MASK,
>> };
>> -struct exynos_tmu_platform_data const exynos5250_default_tmu_data = {
>> - .threshold_falling = 10,
>> - .trigger_levels[0] = 85,
>> - .trigger_levels[1] = 103,
>> - .trigger_levels[2] = 110,
>> - .trigger_levels[3] = 120,
>> - .trigger_enable[0] = 1,
>> - .trigger_enable[1] = 1,
>> - .trigger_enable[2] = 1,
>> - .trigger_enable[3] = 0,
>> - .trigger_type[0] = THROTTLE_ACTIVE,
>> - .trigger_type[1] = THROTTLE_ACTIVE,
>> - .trigger_type[2] = SW_TRIP,
>> - .trigger_type[3] = HW_TRIP,
>> - .max_trigger_level = 4,
>> - .gain = 8,
>> - .reference_voltage = 16,
>> - .noise_cancel_mode = 4,
>> - .cal_type = TYPE_ONE_POINT_TRIMMING,
>> - .efuse_value = 55,
>> - .min_efuse_value = 40,
>> - .max_efuse_value = 100,
>> - .first_point_trim = 25,
>> - .second_point_trim = 85,
>> - .default_temp_offset = 50,
>> - .freq_tab[0] = {
>> - .freq_clip_max = 800 * 1000,
>> - .temp_level = 85,
>> - },
>> - .freq_tab[1] = {
>> - .freq_clip_max = 200 * 1000,
>> - .temp_level = 103,
>> - },
>> - .freq_tab_count = 2,
>> - .type = SOC_ARCH_EXYNOS,
>> +
>> +#define EXYNOS5250_TMU_DATA \
>> + .threshold_falling = 10, \
>> + .trigger_levels[0] = 85, \
>> + .trigger_levels[1] = 103, \
>> + .trigger_levels[2] = 110, \
>> + .trigger_levels[3] = 120, \
>> + .trigger_enable[0] = 1, \
>> + .trigger_enable[1] = 1, \
>> + .trigger_enable[2] = 1, \
>> + .trigger_enable[3] = 0, \
>> + .trigger_type[0] = THROTTLE_ACTIVE, \
>> + .trigger_type[1] = THROTTLE_ACTIVE, \
>> + .trigger_type[2] = SW_TRIP, \
>> + .trigger_type[3] = HW_TRIP, \
>> + .max_trigger_level = 4, \
>> + .gain = 8, \
>> + .reference_voltage = 16, \
>> + .noise_cancel_mode = 4, \
>> + .cal_type = TYPE_ONE_POINT_TRIMMING, \
>> + .efuse_value = 55, \
>> + .min_efuse_value = 40, \
>> + .max_efuse_value = 100, \
>> + .first_point_trim = 25, \
>> + .second_point_trim = 85, \
>> + .default_temp_offset = 50, \
>> + .freq_tab[0] = { \
>> + .freq_clip_max = 800 * 1000, \
>> + .temp_level = 85, \
>> + }, \
>> + .freq_tab[1] = { \
>> + .freq_clip_max = 200 * 1000, \
>> + .temp_level = 103, \
>> + }, \
>> + .freq_tab_count = 2, \
>> + .type = SOC_ARCH_EXYNOS, \
>> .registers = &exynos5250_tmu_registers,
>> +
>> +struct exynos_tmu_init_data const exynos5250_default_tmu_data = {
>> + .tmu_data = {
>> + { EXYNOS5250_TMU_DATA },
>> + },
>> + .tmu_count = 1,
>> };
>> #endif
>> diff --git a/drivers/thermal/samsung/exynos_tmu_data.h b/drivers/thermal/samsung/exynos_tmu_data.h
>> index 4acf070..139dbbb 100644
>> --- a/drivers/thermal/samsung/exynos_tmu_data.h
>> +++ b/drivers/thermal/samsung/exynos_tmu_data.h
>> @@ -94,14 +94,14 @@
>> #define EXYNOS_MAX_TRIGGER_PER_REG 4
>>
>> #if defined(CONFIG_CPU_EXYNOS4210)
>> -extern struct exynos_tmu_platform_data const exynos4210_default_tmu_data;
>> +extern struct exynos_tmu_init_data const exynos4210_default_tmu_data;
>> #define EXYNOS4210_TMU_DRV_DATA (&exynos4210_default_tmu_data)
>> #else
>> #define EXYNOS4210_TMU_DRV_DATA (NULL)
>> #endif
>>
>> #if (defined(CONFIG_SOC_EXYNOS5250) || defined(CONFIG_SOC_EXYNOS4412))
>> -extern struct exynos_tmu_platform_data const exynos5250_default_tmu_data;
>> +extern struct exynos_tmu_init_data const exynos5250_default_tmu_data;
>> #define EXYNOS5250_TMU_DRV_DATA (&exynos5250_default_tmu_data)
>> #else
>> #define EXYNOS5250_TMU_DRV_DATA (NULL)
>>
>
>
> --
> You have got to be excited about what you are doing. (L. Lamport)
>
> Eduardo Valentin
>
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