[POWERPC] cbe_thermal: add throttling attributes to cpu and spu nodes (5f7bdaee) · Commits · e / devices / android_kernel_teracube_2e

arch/powerpc/platforms/cell/cbe_thermal.c

+154 −1

Original line number	Diff line number	Diff line
		/*
		* thermal support for the cell processor
		*
		* This module adds some sysfs attributes to cpu and spu nodes.
		* Base for measurements are the digital thermal sensors (DTS)
		* located on the chip.
		* The accuracy is 2 degrees, starting from 65 up to 125 degrees celsius
		* The attributes can be found under
		* /sys/devices/system/cpu/cpuX/thermal
		* /sys/devices/system/spu/spuX/thermal
		*
		* The following attributes are added for each node:
		* temperature:
		* contains the current temperature measured by the DTS
		* throttle_begin:
		* throttling begins when temperature is greater or equal to
		* throttle_begin. Setting this value to 125 prevents throttling.
		* throttle_end:
		* throttling is being ceased, if the temperature is lower than
		* throttle_end. Due to a delay between applying throttling and
		* a reduced temperature this value should be less than throttle_begin.
		* A value equal to throttle_begin provides only a very little hysteresis.
		* throttle_full_stop:
		* If the temperatrue is greater or equal to throttle_full_stop,
		* full throttling is applied to the cpu or spu. This value should be
		* greater than throttle_begin and throttle_end. Setting this value to
		* 65 prevents the unit from running code at all.
		*
		* (C) Copyright IBM Deutschland Entwicklung GmbH 2005
		*
		* Author: Christian Krafft <krafft@de.ibm.com>
		@@ -31,9 +56,24 @@
		#include "cbe_regs.h"
		#include "spu_priv1_mmio.h"

		#define TEMP_MIN 65
		#define TEMP_MAX 125

		#define SYSDEV_PREFIX_ATTR(_prefix,_name,_mode) \
		struct sysdev_attribute attr_ ## _prefix ## _ ## _name = { \
		.attr = { .name = __stringify(_name), .mode = _mode }, \
		.show = _prefix ## _show_ ## _name, \
		.store = _prefix ## _store_ ## _name, \
		};

		static inline u8 reg_to_temp(u8 reg_value)
		{
		return ((reg_value & 0x3f) << 1) + 65;
		return ((reg_value & 0x3f) << 1) + TEMP_MIN;
		}

		static inline u8 temp_to_reg(u8 temp)
		{
		return ((temp - TEMP_MIN) >> 1) & 0x3f;
		}

		static struct cbe_pmd_regs __iomem get_pmd_regs(struct sys_device sysdev)
		@@ -73,6 +113,73 @@ static ssize_t spu_show_temp(struct sys_device sysdev, char buf)
		return sprintf(buf, "%d\n", reg_to_temp(value));
		}

		static ssize_t show_throttle(struct cbe_pmd_regs __iomem pmd_regs, char buf, int pos)
		{
		u64 value;

		value = in_be64(&pmd_regs->tm_tpr.val);
		/* access the corresponding byte */
		value >>= pos;
		value &= 0x3F;

		return sprintf(buf, "%d\n", reg_to_temp(value));
		}

		static ssize_t store_throttle(struct cbe_pmd_regs __iomem pmd_regs, const char buf, size_t size, int pos)
		{
		u64 reg_value;
		int temp;
		u64 new_value;
		int ret;

		ret = sscanf(buf, "%u", &temp);

		if (ret != 1 \|\| temp < TEMP_MIN \|\| temp > TEMP_MAX)
		return -EINVAL;

		new_value = temp_to_reg(temp);

		reg_value = in_be64(&pmd_regs->tm_tpr.val);

		/* zero out bits for new value */
		reg_value &= ~(0xffull << pos);
		/* set bits to new value */
		reg_value \|= new_value << pos;

		out_be64(&pmd_regs->tm_tpr.val, reg_value);
		return size;
		}

		static ssize_t spu_show_throttle_end(struct sys_device sysdev, char buf)
		{
		return show_throttle(get_pmd_regs(sysdev), buf, 0);
		}

		static ssize_t spu_show_throttle_begin(struct sys_device sysdev, char buf)
		{
		return show_throttle(get_pmd_regs(sysdev), buf, 8);
		}

		static ssize_t spu_show_throttle_full_stop(struct sys_device sysdev, char buf)
		{
		return show_throttle(get_pmd_regs(sysdev), buf, 16);
		}

		static ssize_t spu_store_throttle_end(struct sys_device sysdev, const char buf, size_t size)
		{
		return store_throttle(get_pmd_regs(sysdev), buf, size, 0);
		}

		static ssize_t spu_store_throttle_begin(struct sys_device sysdev, const char buf, size_t size)
		{
		return store_throttle(get_pmd_regs(sysdev), buf, size, 8);
		}

		static ssize_t spu_store_throttle_full_stop(struct sys_device sysdev, const char buf, size_t size)
		{
		return store_throttle(get_pmd_regs(sysdev), buf, size, 16);
		}

		static ssize_t ppe_show_temp(struct sys_device sysdev, char buf, int pos)
		{
		struct cbe_pmd_regs __iomem *pmd_regs;
		@@ -100,13 +207,52 @@ static ssize_t ppe_show_temp1(struct sys_device sysdev, char buf)
		return ppe_show_temp(sysdev, buf, 0);
		}

		static ssize_t ppe_show_throttle_end(struct sys_device sysdev, char buf)
		{
		return show_throttle(cbe_get_cpu_pmd_regs(sysdev->id), buf, 32);
		}

		static ssize_t ppe_show_throttle_begin(struct sys_device sysdev, char buf)
		{
		return show_throttle(cbe_get_cpu_pmd_regs(sysdev->id), buf, 40);
		}

		static ssize_t ppe_show_throttle_full_stop(struct sys_device sysdev, char buf)
		{
		return show_throttle(cbe_get_cpu_pmd_regs(sysdev->id), buf, 48);
		}

		static ssize_t ppe_store_throttle_end(struct sys_device sysdev, const char buf, size_t size)
		{
		return store_throttle(cbe_get_cpu_pmd_regs(sysdev->id), buf, size, 32);
		}

		static ssize_t ppe_store_throttle_begin(struct sys_device sysdev, const char buf, size_t size)
		{
		return store_throttle(cbe_get_cpu_pmd_regs(sysdev->id), buf, size, 40);
		}

		static ssize_t ppe_store_throttle_full_stop(struct sys_device sysdev, const char buf, size_t size)
		{
		return store_throttle(cbe_get_cpu_pmd_regs(sysdev->id), buf, size, 48);
		}


		static struct sysdev_attribute attr_spu_temperature = {
		.attr = {.name = "temperature", .mode = 0400 },
		.show = spu_show_temp,
		};

		static SYSDEV_PREFIX_ATTR(spu, throttle_end, 0600);
		static SYSDEV_PREFIX_ATTR(spu, throttle_begin, 0600);
		static SYSDEV_PREFIX_ATTR(spu, throttle_full_stop, 0600);


		static struct attribute *spu_attributes[] = {
		&attr_spu_temperature.attr,
		&attr_spu_throttle_end.attr,
		&attr_spu_throttle_begin.attr,
		&attr_spu_throttle_full_stop.attr,
		NULL,
		};

		@@ -125,9 +271,16 @@ static struct sysdev_attribute attr_ppe_temperature1 = {
		.show = ppe_show_temp1,
		};

		static SYSDEV_PREFIX_ATTR(ppe, throttle_end, 0600);
		static SYSDEV_PREFIX_ATTR(ppe, throttle_begin, 0600);
		static SYSDEV_PREFIX_ATTR(ppe, throttle_full_stop, 0600);

		static struct attribute *ppe_attributes[] = {
		&attr_ppe_temperature0.attr,
		&attr_ppe_temperature1.attr,
		&attr_ppe_throttle_end.attr,
		&attr_ppe_throttle_begin.attr,
		&attr_ppe_throttle_full_stop.attr,
		NULL,
		};