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373 lines
10 KiB
373 lines
10 KiB
/*
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* thermal support for the cell processor
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*
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* This module adds some sysfs attributes to cpu and spu nodes.
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* Base for measurements are the digital thermal sensors (DTS)
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* located on the chip.
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* The accuracy is 2 degrees, starting from 65 up to 125 degrees celsius
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* The attributes can be found under
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* /sys/devices/system/cpu/cpuX/thermal
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* /sys/devices/system/spu/spuX/thermal
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*
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* The following attributes are added for each node:
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* temperature:
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* contains the current temperature measured by the DTS
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* throttle_begin:
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* throttling begins when temperature is greater or equal to
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* throttle_begin. Setting this value to 125 prevents throttling.
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* throttle_end:
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* throttling is being ceased, if the temperature is lower than
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* throttle_end. Due to a delay between applying throttling and
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* a reduced temperature this value should be less than throttle_begin.
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* A value equal to throttle_begin provides only a very little hysteresis.
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* throttle_full_stop:
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* If the temperatrue is greater or equal to throttle_full_stop,
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* full throttling is applied to the cpu or spu. This value should be
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* greater than throttle_begin and throttle_end. Setting this value to
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* 65 prevents the unit from running code at all.
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*
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* (C) Copyright IBM Deutschland Entwicklung GmbH 2005
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*
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* Author: Christian Krafft <krafft@de.ibm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/sysdev.h>
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#include <linux/kernel.h>
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#include <linux/cpu.h>
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#include <asm/spu.h>
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#include <asm/io.h>
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#include <asm/prom.h>
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#include "cbe_regs.h"
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#include "spu_priv1_mmio.h"
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#define TEMP_MIN 65
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#define TEMP_MAX 125
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#define SYSDEV_PREFIX_ATTR(_prefix,_name,_mode) \
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struct sysdev_attribute attr_ ## _prefix ## _ ## _name = { \
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.attr = { .name = __stringify(_name), .mode = _mode }, \
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.show = _prefix ## _show_ ## _name, \
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.store = _prefix ## _store_ ## _name, \
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};
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static inline u8 reg_to_temp(u8 reg_value)
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{
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return ((reg_value & 0x3f) << 1) + TEMP_MIN;
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}
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static inline u8 temp_to_reg(u8 temp)
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{
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return ((temp - TEMP_MIN) >> 1) & 0x3f;
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}
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static struct cbe_pmd_regs __iomem *get_pmd_regs(struct sys_device *sysdev)
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{
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struct spu *spu;
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spu = container_of(sysdev, struct spu, sysdev);
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return cbe_get_pmd_regs(spu_devnode(spu));
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}
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/* returns the value for a given spu in a given register */
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static u8 spu_read_register_value(struct sys_device *sysdev, union spe_reg __iomem *reg)
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{
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const unsigned int *id;
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union spe_reg value;
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struct spu *spu;
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/* getting the id from the reg attribute will not work on future device-tree layouts
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* in future we should store the id to the spu struct and use it here */
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spu = container_of(sysdev, struct spu, sysdev);
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id = of_get_property(spu_devnode(spu), "reg", NULL);
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value.val = in_be64(®->val);
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return value.spe[*id];
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}
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static ssize_t spu_show_temp(struct sys_device *sysdev, char *buf)
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{
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u8 value;
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struct cbe_pmd_regs __iomem *pmd_regs;
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pmd_regs = get_pmd_regs(sysdev);
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value = spu_read_register_value(sysdev, &pmd_regs->ts_ctsr1);
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return sprintf(buf, "%d\n", reg_to_temp(value));
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}
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static ssize_t show_throttle(struct cbe_pmd_regs __iomem *pmd_regs, char *buf, int pos)
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{
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u64 value;
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value = in_be64(&pmd_regs->tm_tpr.val);
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/* access the corresponding byte */
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value >>= pos;
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value &= 0x3F;
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return sprintf(buf, "%d\n", reg_to_temp(value));
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}
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static ssize_t store_throttle(struct cbe_pmd_regs __iomem *pmd_regs, const char *buf, size_t size, int pos)
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{
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u64 reg_value;
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int temp;
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u64 new_value;
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int ret;
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ret = sscanf(buf, "%u", &temp);
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if (ret != 1 || temp < TEMP_MIN || temp > TEMP_MAX)
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return -EINVAL;
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new_value = temp_to_reg(temp);
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reg_value = in_be64(&pmd_regs->tm_tpr.val);
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/* zero out bits for new value */
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reg_value &= ~(0xffull << pos);
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/* set bits to new value */
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reg_value |= new_value << pos;
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out_be64(&pmd_regs->tm_tpr.val, reg_value);
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return size;
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}
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static ssize_t spu_show_throttle_end(struct sys_device *sysdev, char *buf)
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{
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return show_throttle(get_pmd_regs(sysdev), buf, 0);
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}
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static ssize_t spu_show_throttle_begin(struct sys_device *sysdev, char *buf)
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{
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return show_throttle(get_pmd_regs(sysdev), buf, 8);
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}
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static ssize_t spu_show_throttle_full_stop(struct sys_device *sysdev, char *buf)
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{
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return show_throttle(get_pmd_regs(sysdev), buf, 16);
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}
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static ssize_t spu_store_throttle_end(struct sys_device *sysdev, const char *buf, size_t size)
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{
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return store_throttle(get_pmd_regs(sysdev), buf, size, 0);
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}
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static ssize_t spu_store_throttle_begin(struct sys_device *sysdev, const char *buf, size_t size)
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{
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return store_throttle(get_pmd_regs(sysdev), buf, size, 8);
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}
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static ssize_t spu_store_throttle_full_stop(struct sys_device *sysdev, const char *buf, size_t size)
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{
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return store_throttle(get_pmd_regs(sysdev), buf, size, 16);
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}
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static ssize_t ppe_show_temp(struct sys_device *sysdev, char *buf, int pos)
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{
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struct cbe_pmd_regs __iomem *pmd_regs;
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u64 value;
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pmd_regs = cbe_get_cpu_pmd_regs(sysdev->id);
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value = in_be64(&pmd_regs->ts_ctsr2);
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value = (value >> pos) & 0x3f;
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return sprintf(buf, "%d\n", reg_to_temp(value));
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}
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/* shows the temperature of the DTS on the PPE,
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* located near the linear thermal sensor */
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static ssize_t ppe_show_temp0(struct sys_device *sysdev, char *buf)
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{
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return ppe_show_temp(sysdev, buf, 32);
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}
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/* shows the temperature of the second DTS on the PPE */
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static ssize_t ppe_show_temp1(struct sys_device *sysdev, char *buf)
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{
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return ppe_show_temp(sysdev, buf, 0);
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}
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static ssize_t ppe_show_throttle_end(struct sys_device *sysdev, char *buf)
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{
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return show_throttle(cbe_get_cpu_pmd_regs(sysdev->id), buf, 32);
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}
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static ssize_t ppe_show_throttle_begin(struct sys_device *sysdev, char *buf)
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{
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return show_throttle(cbe_get_cpu_pmd_regs(sysdev->id), buf, 40);
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}
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static ssize_t ppe_show_throttle_full_stop(struct sys_device *sysdev, char *buf)
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{
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return show_throttle(cbe_get_cpu_pmd_regs(sysdev->id), buf, 48);
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}
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static ssize_t ppe_store_throttle_end(struct sys_device *sysdev, const char *buf, size_t size)
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{
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return store_throttle(cbe_get_cpu_pmd_regs(sysdev->id), buf, size, 32);
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}
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static ssize_t ppe_store_throttle_begin(struct sys_device *sysdev, const char *buf, size_t size)
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{
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return store_throttle(cbe_get_cpu_pmd_regs(sysdev->id), buf, size, 40);
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}
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static ssize_t ppe_store_throttle_full_stop(struct sys_device *sysdev, const char *buf, size_t size)
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{
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return store_throttle(cbe_get_cpu_pmd_regs(sysdev->id), buf, size, 48);
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}
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static struct sysdev_attribute attr_spu_temperature = {
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.attr = {.name = "temperature", .mode = 0400 },
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.show = spu_show_temp,
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};
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static SYSDEV_PREFIX_ATTR(spu, throttle_end, 0600);
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static SYSDEV_PREFIX_ATTR(spu, throttle_begin, 0600);
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static SYSDEV_PREFIX_ATTR(spu, throttle_full_stop, 0600);
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static struct attribute *spu_attributes[] = {
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&attr_spu_temperature.attr,
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&attr_spu_throttle_end.attr,
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&attr_spu_throttle_begin.attr,
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&attr_spu_throttle_full_stop.attr,
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NULL,
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};
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static struct attribute_group spu_attribute_group = {
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.name = "thermal",
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.attrs = spu_attributes,
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};
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static struct sysdev_attribute attr_ppe_temperature0 = {
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.attr = {.name = "temperature0", .mode = 0400 },
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.show = ppe_show_temp0,
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};
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static struct sysdev_attribute attr_ppe_temperature1 = {
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.attr = {.name = "temperature1", .mode = 0400 },
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.show = ppe_show_temp1,
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};
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static SYSDEV_PREFIX_ATTR(ppe, throttle_end, 0600);
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static SYSDEV_PREFIX_ATTR(ppe, throttle_begin, 0600);
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static SYSDEV_PREFIX_ATTR(ppe, throttle_full_stop, 0600);
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static struct attribute *ppe_attributes[] = {
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&attr_ppe_temperature0.attr,
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&attr_ppe_temperature1.attr,
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&attr_ppe_throttle_end.attr,
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&attr_ppe_throttle_begin.attr,
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&attr_ppe_throttle_full_stop.attr,
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NULL,
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};
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static struct attribute_group ppe_attribute_group = {
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.name = "thermal",
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.attrs = ppe_attributes,
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};
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/*
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* initialize throttling with default values
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*/
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static void __init init_default_values(void)
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{
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int cpu;
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struct cbe_pmd_regs __iomem *pmd_regs;
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struct sys_device *sysdev;
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union ppe_spe_reg tpr;
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union spe_reg str1;
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u64 str2;
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union spe_reg cr1;
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u64 cr2;
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/* TPR defaults */
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/* ppe
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* 1F - no full stop
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* 08 - dynamic throttling starts if over 80 degrees
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* 03 - dynamic throttling ceases if below 70 degrees */
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tpr.ppe = 0x1F0803;
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/* spe
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* 10 - full stopped when over 96 degrees
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* 08 - dynamic throttling starts if over 80 degrees
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* 03 - dynamic throttling ceases if below 70 degrees
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*/
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tpr.spe = 0x100803;
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/* STR defaults */
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/* str1
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* 10 - stop 16 of 32 cycles
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*/
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str1.val = 0x1010101010101010ull;
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/* str2
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* 10 - stop 16 of 32 cycles
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*/
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str2 = 0x10;
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/* CR defaults */
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/* cr1
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* 4 - normal operation
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*/
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cr1.val = 0x0404040404040404ull;
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/* cr2
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* 4 - normal operation
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*/
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cr2 = 0x04;
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for_each_possible_cpu (cpu) {
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pr_debug("processing cpu %d\n", cpu);
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sysdev = get_cpu_sysdev(cpu);
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pmd_regs = cbe_get_cpu_pmd_regs(sysdev->id);
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out_be64(&pmd_regs->tm_str2, str2);
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out_be64(&pmd_regs->tm_str1.val, str1.val);
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out_be64(&pmd_regs->tm_tpr.val, tpr.val);
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out_be64(&pmd_regs->tm_cr1.val, cr1.val);
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out_be64(&pmd_regs->tm_cr2, cr2);
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}
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}
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static int __init thermal_init(void)
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{
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init_default_values();
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spu_add_sysdev_attr_group(&spu_attribute_group);
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cpu_add_sysdev_attr_group(&ppe_attribute_group);
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return 0;
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}
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module_init(thermal_init);
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static void __exit thermal_exit(void)
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{
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spu_remove_sysdev_attr_group(&spu_attribute_group);
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cpu_remove_sysdev_attr_group(&ppe_attribute_group);
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}
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module_exit(thermal_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Christian Krafft <krafft@de.ibm.com>");
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