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Date: Fri, 10 May 2013 08:02:18 +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>
Subject: Re: [PATCH V3 15/21] thermal: exynos: Add support to handle many
instances of TMU
On Thu, May 9, 2013 at 8:23 PM, Eduardo Valentin
<eduardo.valentin@...com> wrote:
> On 07-05-2013 09:01, 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 interrupts for all the TMU. Also
>> the identifier of the TMU controller is extracted from device tree alias.
>>
>> Acked-by: Kukjin Kim <kgene.kim@...sung.com>
>> Signed-off-by: Amit Daniel Kachhap <amit.daniel@...sung.com>
>> ---
>> drivers/thermal/samsung/exynos_tmu.c | 125 +++++++++++++++++++++++-----------
>> 1 files changed, 84 insertions(+), 41 deletions(-)
>>
>> diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c
>> index bdf40ef..94d6e8e 100644
>> --- a/drivers/thermal/samsung/exynos_tmu.c
>> +++ b/drivers/thermal/samsung/exynos_tmu.c
>> @@ -29,6 +29,8 @@
>> #include <linux/module.h>
>> #include <linux/mutex.h>
>> #include <linux/of.h>
>> +#include <linux/of_address.h>
>> +#include <linux/of_irq.h>
>> #include <linux/platform_device.h>
>> #include <linux/slab.h>
>> #include <linux/workqueue.h>
>> @@ -36,9 +38,24 @@
>> #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;
>> @@ -46,6 +63,7 @@ struct exynos_tmu_data {
>> struct mutex lock;
>> struct clk *clk;
>> u8 temp_error1, temp_error2;
>> + struct thermal_sensor_conf *reg_conf;
>> };
>>
>> /*
>> @@ -319,12 +337,6 @@ 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,
>> @@ -333,7 +345,7 @@ static void exynos_tmu_work(struct work_struct *work)
>> 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);
>>
>> @@ -405,10 +417,42 @@ static inline struct exynos_tmu_platform_data *exynos_get_driver_data(
>> platform_get_device_id(pdev)->driver_data;
>> }
>>
>> +static int exynos_map_dt_data(struct platform_device *pdev)
>> +{
>> + struct exynos_tmu_data *data = platform_get_drvdata(pdev);
>> + struct resource res;
>> +
>> + 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\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 -ENOMEM;
>
> looks like the statement below fits better here:
> return ERR_PTR(-EADDRNOTAVAIL);
Ok.
>
>> + }
>
> blank line?
Ok.
>
>> + return 0;
>> +}
>> +
>> static int exynos_tmu_probe(struct platform_device *pdev)
>> {
>> struct exynos_tmu_data *data;
>> struct exynos_tmu_platform_data *pdata = pdev->dev.platform_data;
>> + struct thermal_sensor_conf *sensor_conf;
>> int ret, i;
>>
>> if (!pdata)
>> @@ -425,26 +469,17 @@ 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;
>> - }
>> -
>> - INIT_WORK(&data->irq_work, exynos_tmu_work);
>> -
>> - data->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> - if (!data->mem) {
>> - dev_err(&pdev->dev, "Failed to get platform resource\n");
>> - return -ENOENT;
>> - }
>> + data->pdata = pdata;
>> + platform_set_drvdata(pdev, data);
>> + mutex_init(&data->lock);
>>
>> - data->base = devm_ioremap_resource(&pdev->dev, data->mem);
>> - if (IS_ERR(data->base))
>> - return PTR_ERR(data->base);
>> + ret = exynos_map_dt_data(pdev);
>> + if (ret)
>> + return ret;
>>
>> + 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);
>> if (ret) {
>> dev_err(&pdev->dev, "Failed to request irq: %d\n", data->irq);
>> return ret;
>> @@ -469,10 +504,6 @@ 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");
>> @@ -481,28 +512,40 @@ 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.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);
>> + /* 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;
>> @@ -521,7 +564,7 @@ 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);
>>
>>
>
>
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