[PATCH v5 07/18] thermal: exynos: Modify exynos thermal code to use device tree for cpu cooling configuration

Lukasz Majewski
2015-01-19T11:20:51Z

Up till now exynos_tmu_data.c was used for storing CPU cooling configuration
data. Now the Exynos thermal core code uses device tree to get this data.
For this purpose generic thermal code for configuring CPU cooling was
used.

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
---
Changes for v2:
- None
Changes for v3:
- Rewrite code responsible for registering CPU cooling device to not depend
on explicit "/cpus/cpu@0" path since now Exynos SoCs use new cpu node
names (e.g. cpu@A00). New approach iterates over "cpus" node children.
- Patch title changed to thermal: exynos
Changes for v4:
- None
Changes for v5:
- None

---
drivers/cpufreq/exynos-cpufreq.c | 30 +++++-
drivers/thermal/samsung/exynos_thermal_common.c | 122 ++++++++++++++----------
drivers/thermal/samsung/exynos_tmu.c | 7 --
drivers/thermal/samsung/exynos_tmu.h | 5 -
drivers/thermal/samsung/exynos_tmu_data.c | 42 +-------
5 files changed, 101 insertions(+), 105 deletions(-)

diff --git a/drivers/cpufreq/exynos-cpufreq.c b/drivers/cpufreq/exynos-cpufreq.c
index f99a0b0..32bc64d 100644
--- a/drivers/cpufreq/exynos-cpufreq.c
+++ b/drivers/cpufreq/exynos-cpufreq.c
@@ -18,10 +18,13 @@
#include <linux/cpufreq.h>
#include <linux/platform_device.h>
#include <linux/of.h>
+#include <linux/cpu_cooling.h>
+#include <linux/cpu.h>

#include "exynos-cpufreq.h"

static struct exynos_dvfs_info *exynos_info;
+static struct thermal_cooling_device *cdev;
static struct regulator *arm_regulator;
static unsigned int locking_frequency;

@@ -156,6 +159,7 @@ static struct cpufreq_driver exynos_driver = {

static int exynos_cpufreq_probe(struct platform_device *pdev)
{
+ struct device_node *cpus, *np;
int ret = -EINVAL;

exynos_info = kzalloc(sizeof(*exynos_info), GFP_KERNEL);
@@ -198,9 +202,31 @@ static int exynos_cpufreq_probe(struct platform_device *pdev)
/* Done here as we want to capture boot frequency */
locking_frequency = clk_get_rate(exynos_info->cpu_clk) / 1000;

- if (!cpufreq_register_driver(&exynos_driver))
- return 0;
+ if (cpufreq_register_driver(&exynos_driver))
+ goto err;

+ cpus = of_find_node_by_path("/cpus");
+ if (!cpus) {
+ pr_err("failed to find cpus node\n");
+ return -ENOENT;
+ }
+
+ for (np = of_get_next_child(cpus, NULL); np;
+ of_node_put(np), np = of_get_next_child(cpus, np)) {
+ if (of_find_property(np, "#cooling-cells", NULL)) {
+ cdev = of_cpufreq_cooling_register(np,
+ cpu_present_mask);
+ if (IS_ERR(cdev))
+ pr_err("running cpufreq without cooling device: %ld\n",
+ PTR_ERR(cdev));
+ break;
+ }
+ }
+ of_node_put(np);
+ of_node_put(cpus);
+
+ return 0;
+ err:
dev_err(&pdev->dev, "failed to register cpufreq driver\n");
regulator_put(arm_regulator);
err_vdd_arm:
diff --git a/drivers/thermal/samsung/exynos_thermal_common.c b/drivers/thermal/samsung/exynos_thermal_common.c
index 6dc3815..00aa688 100644
--- a/drivers/thermal/samsung/exynos_thermal_common.c
+++ b/drivers/thermal/samsung/exynos_thermal_common.c
@@ -133,47 +133,62 @@ static int exynos_get_crit_temp(struct thermal_zone_device *thermal,
static int exynos_bind(struct thermal_zone_device *thermal,
struct thermal_cooling_device *cdev)
{
- int ret = 0, i, tab_size, level;
- struct freq_clip_table *tab_ptr, *clip_data;
struct exynos_thermal_zone *th_zone = thermal->devdata;
struct thermal_sensor_conf *data = th_zone->sensor_conf;
+ struct device_node *child, *gchild, *np;
+ struct of_phandle_args cooling_spec;
+ unsigned long max, state = 0;
+ int ret = 0, i = 0;

- tab_ptr = (struct freq_clip_table *)data->cooling_data.freq_data;
- tab_size = data->cooling_data.freq_clip_count;
-
- if (tab_ptr == NULL || tab_size == 0)
+ /*
+ * Below code is necessary to skip binding when cpufreq's
+ * frequency table is not yet initialized.
+ */
+ cdev->ops->get_max_state(cdev, &state);
+ if (!state && !th_zone->cool_dev_size) {
+ th_zone->cool_dev_size = 1;
+ th_zone->cool_dev[0] = cdev;
+ th_zone->bind = false;
return 0;
+ }

- /* find the cooling device registered*/
- for (i = 0; i < th_zone->cool_dev_size; i++)
- if (cdev == th_zone->cool_dev[i])
- break;
+ np = of_find_node_by_path("/thermal-zones/cpu-thermal");
+ if (!np) {
+ pr_err("failed to find thmerla-zones/cpu-thermal node\n");
+ return -ENOENT;
+ }

- /* No matching cooling device */
- if (i == th_zone->cool_dev_size)
- return 0;
+ child = of_get_child_by_name(np, "cooling-maps");

- /* Bind the thermal zone to the cpufreq cooling device */
- for (i = 0; i < tab_size; i++) {
- clip_data = (struct freq_clip_table *)&(tab_ptr[i]);
- level = cpufreq_cooling_get_level(0, clip_data->freq_clip_max);
- if (level == THERMAL_CSTATE_INVALID)
- return 0;
- switch (GET_ZONE(i)) {
- case MONITOR_ZONE:
- case WARN_ZONE:
- if (thermal_zone_bind_cooling_device(thermal, i, cdev,
- level, 0)) {
- dev_err(data->dev,
- "error unbinding cdev inst=%d\n", i);
- ret = -EINVAL;
- }
- th_zone->bind = true;
- break;
- default:
+ for_each_child_of_node(child, gchild) {
+ ret = of_parse_phandle_with_args(gchild, "cooling-device",
+ "#cooling-cells",
+ 0, &cooling_spec);
+ if (ret < 0) {
+ pr_err("missing cooling_device property\n");
+ goto end;
+ }
+
+ if (cooling_spec.args_count < 2) {
ret = -EINVAL;
+ goto end;
}
+
+ max = cooling_spec.args[0];
+ if (thermal_zone_bind_cooling_device(thermal, i, cdev,
+ max, 0)) {
+ dev_err(data->dev,
+ "thermal error unbinding cdev inst=%d\n", i);
+
+ ret = -EINVAL;
+ goto end;
+ }
+ i++;
}
+ th_zone->bind = true;
+end:
+ of_node_put(child);
+ of_node_put(np);

return ret;
}
@@ -182,16 +197,12 @@ static int exynos_bind(struct thermal_zone_device *thermal,
static int exynos_unbind(struct thermal_zone_device *thermal,
struct thermal_cooling_device *cdev)
{
- int ret = 0, i, tab_size;
+ int ret = 0, i;
struct exynos_thermal_zone *th_zone = thermal->devdata;
struct thermal_sensor_conf *data = th_zone->sensor_conf;
+ struct device_node *child, *gchild, *np;

- if (th_zone->bind == false)
- return 0;
-
- tab_size = data->cooling_data.freq_clip_count;
-
- if (tab_size == 0)
+ if (th_zone->bind == false || !th_zone->cool_dev_size)
return 0;

/* find the cooling device registered*/
@@ -203,23 +214,30 @@ static int exynos_unbind(struct thermal_zone_device *thermal,
if (i == th_zone->cool_dev_size)
return 0;

- /* Bind the thermal zone to the cpufreq cooling device */
- for (i = 0; i < tab_size; i++) {
- switch (GET_ZONE(i)) {
- case MONITOR_ZONE:
- case WARN_ZONE:
- if (thermal_zone_unbind_cooling_device(thermal, i,
- cdev)) {
- dev_err(data->dev,
- "error unbinding cdev inst=%d\n", i);
- ret = -EINVAL;
- }
- th_zone->bind = false;
- break;
- default:
+ np = of_find_node_by_path("/thermal-zones/cpu-thermal");
+ if (!np) {
+ pr_err("failed to find thmerla-zones/cpu-thermal node\n");
+ return -ENOENT;
+ }
+
+ child = of_get_child_by_name(np, "cooling-maps");
+
+ i = 0;
+ for_each_child_of_node(child, gchild) {
+ if (thermal_zone_unbind_cooling_device(thermal, i,
+ cdev)) {
+ dev_err(data->dev,
+ "error unbinding cdev inst=%d\n", i);
ret = -EINVAL;
+ goto end;
}
+ i++;
}
+ th_zone->bind = false;
+end:
+ of_node_put(child);
+ of_node_put(np);
+
return ret;
}

diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c
index 5000727..ae30f6a 100644
--- a/drivers/thermal/samsung/exynos_tmu.c
+++ b/drivers/thermal/samsung/exynos_tmu.c
@@ -916,13 +916,6 @@ static int exynos_tmu_probe(struct platform_device *pdev)

sensor_conf->trip_data.trigger_falling = pdata->threshold_falling;

- sensor_conf->cooling_data.freq_clip_count = pdata->freq_tab_count;
- for (i = 0; i < pdata->freq_tab_count; i++) {
- sensor_conf->cooling_data.freq_data[i].freq_clip_max =
- pdata->freq_tab[i].freq_clip_max;
- sensor_conf->cooling_data.freq_data[i].temp_level =
- pdata->freq_tab[i].temp_level;
- }
sensor_conf->dev = &pdev->dev;
/* Register the sensor with thermal management interface */
ret = exynos_register_thermal(sensor_conf);
diff --git a/drivers/thermal/samsung/exynos_tmu.h b/drivers/thermal/samsung/exynos_tmu.h
index 7f880d2..627dec9 100644
--- a/drivers/thermal/samsung/exynos_tmu.h
+++ b/drivers/thermal/samsung/exynos_tmu.h
@@ -83,9 +83,6 @@ enum soc_type {
* @second_point_trim: temp value of the second point trimming
* @default_temp_offset: default temperature offset in case of no trimming
* @cal_type: calibration type for temperature
- * @freq_clip_table: Table representing frequency reduction percentage.
- * @freq_tab_count: Count of the above table as frequency reduction may
- * applicable to only some of the trigger levels.
*
* This structure is required for configuration of exynos_tmu driver.
*/
@@ -111,8 +108,6 @@ struct exynos_tmu_platform_data {
enum soc_type type;
u32 cal_type;
u32 cal_mode;
- struct freq_clip_table freq_tab[4];
- unsigned int freq_tab_count;
};

/**
diff --git a/drivers/thermal/samsung/exynos_tmu_data.c b/drivers/thermal/samsung/exynos_tmu_data.c
index b239100..a993f3d 100644
--- a/drivers/thermal/samsung/exynos_tmu_data.c
+++ b/drivers/thermal/samsung/exynos_tmu_data.c
@@ -47,15 +47,6 @@ struct exynos_tmu_init_data const exynos4210_default_tmu_data = {
.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,
},
},
@@ -87,16 +78,7 @@ struct exynos_tmu_init_data const exynos4210_default_tmu_data = {
.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 = 70, \
- }, \
- .freq_tab[1] = { \
- .freq_clip_max = 400 * 1000, \
- .temp_level = 95, \
- }, \
- .freq_tab_count = 2
+ .default_temp_offset = 50

struct exynos_tmu_init_data const exynos3250_default_tmu_data = {
.tmu_data = {
@@ -133,16 +115,7 @@ struct exynos_tmu_init_data const exynos3250_default_tmu_data = {
.max_efuse_value = 100, \
.first_point_trim = 25, \
.second_point_trim = 85, \
- .default_temp_offset = 50, \
- .freq_tab[0] = { \
- .freq_clip_max = 1400 * 1000, \
- .temp_level = 70, \
- }, \
- .freq_tab[1] = { \
- .freq_clip_max = 400 * 1000, \
- .temp_level = 95, \
- }, \
- .freq_tab_count = 2
+ .default_temp_offset = 50

struct exynos_tmu_init_data const exynos4412_default_tmu_data = {
.tmu_data = {
@@ -189,16 +162,7 @@ struct exynos_tmu_init_data const exynos5250_default_tmu_data = {
.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, \
+ .default_temp_offset = 50,

#define EXYNOS5260_TMU_DATA \
__EXYNOS5260_TMU_DATA \
--
2.0.0.rc2