![Christian Krafft](/assets/img/avatar_default.png)
This patch adds NULL to the initialization of the attribute_groups. The spu_attributes and ppe_attributes arrays are arrays of pointers that need to be terminated with a NULL entry. Signed-off-by: Christian Krafft <krafft@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
229 lines
5.5 KiB
C
229 lines
5.5 KiB
C
/*
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* thermal support for the cell processor
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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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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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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 = (unsigned int *)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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int 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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/* clear all other bits */
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value &= 0x3F;
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/* temp is stored in steps of 2 degrees */
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value *= 2;
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/* base temp is 65 degrees */
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value += 65;
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return sprintf(buf, "%d\n", (int) value);
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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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/* access the corresponding byte */
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value >>= pos;
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/* clear all other bits */
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value &= 0x3F;
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/* temp is stored in steps of 2 degrees */
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value *= 2;
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/* base temp is 65 degrees */
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value += 65;
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return sprintf(buf, "%d\n", (int) 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 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 struct attribute *spu_attributes[] = {
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&attr_spu_temperature.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 struct attribute *ppe_attributes[] = {
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&attr_ppe_temperature0.attr,
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&attr_ppe_temperature1.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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