[POWERPC] cell: add temperature to SPU and CPU sysfs entries (b3d7dc19) · Commits · e / devices / android_kernel_teracube_emerald

arch/powerpc/configs/cell_defconfig

+1 −0

Original line number	Diff line number	Diff line
		@@ -149,6 +149,7 @@ CONFIG_MMIO_NVRAM=y
		CONFIG_SPU_FS=m
		CONFIG_SPU_BASE=y
		CONFIG_CBE_RAS=y
		CONFIG_CBE_THERM=m

		#
		# Kernel options

arch/powerpc/platforms/cell/Kconfig

+5 −0

Original line number	Diff line number	Diff line
		@@ -20,4 +20,9 @@ config CBE_RAS
		bool "RAS features for bare metal Cell BE"
		default y

		config CBE_THERM
		tristate "CBE thermal support"
		default m
		depends on CBE_RAS

		endmenu

arch/powerpc/platforms/cell/Makefile

+2 −0

Original line number	Diff line number	Diff line
		@@ -3,6 +3,8 @@ obj-$(CONFIG_PPC_CELL_NATIVE) += interrupt.o iommu.o setup.o \
		pmu.o
		obj-$(CONFIG_CBE_RAS) += ras.o

		obj-$(CONFIG_CBE_THERM) += cbe_thermal.o

		ifeq ($(CONFIG_SMP),y)
		obj-$(CONFIG_PPC_CELL_NATIVE) += smp.o
		endif

arch/powerpc/platforms/cell/cbe_thermal.c

0 → 100644

+225 −0

Original line number	Diff line number	Diff line
		/*
		* thermal support for the cell processor
		*
		* (C) Copyright IBM Deutschland Entwicklung GmbH 2005
		*
		* Author: Christian Krafft <krafft@de.ibm.com>
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License as published by
		* the Free Software Foundation; either version 2, or (at your option)
		* any later version.
		*
		* This program is distributed in the hope that 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.
		*
		* You should have received a copy of the GNU General Public License
		* along with this program; if not, write to the Free Software
		* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
		*/

		#include <linux/module.h>
		#include <linux/sysdev.h>
		#include <linux/kernel.h>
		#include <linux/cpu.h>
		#include <asm/spu.h>
		#include <asm/io.h>
		#include <asm/prom.h>

		#include "cbe_regs.h"

		static struct cbe_pmd_regs __iomem get_pmd_regs(struct sys_device sysdev)
		{
		struct spu *spu;

		spu = container_of(sysdev, struct spu, sysdev);

		return cbe_get_pmd_regs(spu->devnode);
		}

		/* returns the value for a given spu in a given register */
		static u8 spu_read_register_value(struct sys_device sysdev, union spe_reg __iomem reg)
		{
		unsigned int *id;
		union spe_reg value;
		struct spu *spu;

		/* getting the id from the reg attribute will not work on future device-tree layouts
		* in future we should store the id to the spu struct and use it here */
		spu = container_of(sysdev, struct spu, sysdev);
		id = (unsigned int *)get_property(spu->devnode, "reg", NULL);
		value.val = in_be64(&reg->val);

		return value.spe[*id];
		}

		static ssize_t spu_show_temp(struct sys_device sysdev, char buf)
		{
		int value;
		struct cbe_pmd_regs __iomem *pmd_regs;

		pmd_regs = get_pmd_regs(sysdev);

		value = spu_read_register_value(sysdev, &pmd_regs->ts_ctsr1);
		/* clear all other bits */
		value &= 0x3F;
		/* temp is stored in steps of 2 degrees */
		value *= 2;
		/* base temp is 65 degrees */
		value += 65;

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

		static ssize_t ppe_show_temp(struct sys_device sysdev, char buf, int pos)
		{
		struct cbe_pmd_regs __iomem *pmd_regs;
		u64 value;

		pmd_regs = cbe_get_cpu_pmd_regs(sysdev->id);
		value = in_be64(&pmd_regs->ts_ctsr2);

		/* access the corresponding byte */
		value >>= pos;
		/* clear all other bits */
		value &= 0x3F;
		/* temp is stored in steps of 2 degrees */
		value *= 2;
		/* base temp is 65 degrees */
		value += 65;

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


		/* shows the temperature of the DTS on the PPE,
		* located near the linear thermal sensor */
		static ssize_t ppe_show_temp0(struct sys_device sysdev, char buf)
		{
		return ppe_show_temp(sysdev, buf, 32);
		}

		/* shows the temperature of the second DTS on the PPE */
		static ssize_t ppe_show_temp1(struct sys_device sysdev, char buf)
		{
		return ppe_show_temp(sysdev, buf, 0);
		}

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

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

		static struct attribute_group spu_attribute_group = {
		.name = "thermal",
		.attrs = spu_attributes,
		};

		static struct sysdev_attribute attr_ppe_temperature0 = {
		.attr = {.name = "temperature0", .mode = 0400 },
		.show = ppe_show_temp0,
		};

		static struct sysdev_attribute attr_ppe_temperature1 = {
		.attr = {.name = "temperature1", .mode = 0400 },
		.show = ppe_show_temp1,
		};

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

		static struct attribute_group ppe_attribute_group = {
		.name = "thermal",
		.attrs = ppe_attributes,
		};

		/*
		* initialize throttling with default values
		*/
		static void __init init_default_values(void)
		{
		int cpu;
		struct cbe_pmd_regs __iomem *pmd_regs;
		struct sys_device *sysdev;
		union ppe_spe_reg tpr;
		union spe_reg str1;
		u64 str2;
		union spe_reg cr1;
		u64 cr2;

		/* TPR defaults */
		/* ppe
		* 1F - no full stop
		* 08 - dynamic throttling starts if over 80 degrees
		* 03 - dynamic throttling ceases if below 70 degrees */
		tpr.ppe = 0x1F0803;
		/* spe
		* 10 - full stopped when over 96 degrees
		* 08 - dynamic throttling starts if over 80 degrees
		* 03 - dynamic throttling ceases if below 70 degrees
		*/
		tpr.spe = 0x100803;

		/* STR defaults */
		/* str1
		* 10 - stop 16 of 32 cycles
		*/
		str1.val = 0x1010101010101010ull;
		/* str2
		* 10 - stop 16 of 32 cycles
		*/
		str2 = 0x10;

		/* CR defaults */
		/* cr1
		* 4 - normal operation
		*/
		cr1.val = 0x0404040404040404ull;
		/* cr2
		* 4 - normal operation
		*/
		cr2 = 0x04;

		for_each_possible_cpu (cpu) {
		pr_debug("processing cpu %d\n", cpu);
		sysdev = get_cpu_sysdev(cpu);
		pmd_regs = cbe_get_cpu_pmd_regs(sysdev->id);

		out_be64(&pmd_regs->tm_str2, str2);
		out_be64(&pmd_regs->tm_str1.val, str1.val);
		out_be64(&pmd_regs->tm_tpr.val, tpr.val);
		out_be64(&pmd_regs->tm_cr1.val, cr1.val);
		out_be64(&pmd_regs->tm_cr2, cr2);
		}
		}


		static int __init thermal_init(void)
		{
		init_default_values();

		spu_add_sysdev_attr_group(&spu_attribute_group);
		cpu_add_sysdev_attr_group(&ppe_attribute_group);

		return 0;
		}
		module_init(thermal_init);

		static void __exit thermal_exit(void)
		{
		spu_remove_sysdev_attr_group(&spu_attribute_group);
		cpu_remove_sysdev_attr_group(&ppe_attribute_group);
		}
		module_exit(thermal_exit);

		MODULE_LICENSE("GPL");
		MODULE_AUTHOR("Christian Krafft <krafft@de.ibm.com>");