2 * thermal support for the cell processor
4 * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
6 * Author: Christian Krafft <krafft@de.ibm.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2, or (at your option)
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 #include <linux/module.h>
24 #include <linux/sysdev.h>
25 #include <linux/kernel.h>
26 #include <linux/cpu.h>
32 #include "spu_priv1_mmio.h"
34 static struct cbe_pmd_regs __iomem *get_pmd_regs(struct sys_device *sysdev)
38 spu = container_of(sysdev, struct spu, sysdev);
40 return cbe_get_pmd_regs(spu_devnode(spu));
43 /* returns the value for a given spu in a given register */
44 static u8 spu_read_register_value(struct sys_device *sysdev, union spe_reg __iomem *reg)
50 /* getting the id from the reg attribute will not work on future device-tree layouts
51 * in future we should store the id to the spu struct and use it here */
52 spu = container_of(sysdev, struct spu, sysdev);
53 id = (unsigned int *)get_property(spu_devnode(spu), "reg", NULL);
54 value.val = in_be64(®->val);
56 return value.spe[*id];
59 static ssize_t spu_show_temp(struct sys_device *sysdev, char *buf)
62 struct cbe_pmd_regs __iomem *pmd_regs;
64 pmd_regs = get_pmd_regs(sysdev);
66 value = spu_read_register_value(sysdev, &pmd_regs->ts_ctsr1);
67 /* clear all other bits */
69 /* temp is stored in steps of 2 degrees */
71 /* base temp is 65 degrees */
74 return sprintf(buf, "%d\n", (int) value);
77 static ssize_t ppe_show_temp(struct sys_device *sysdev, char *buf, int pos)
79 struct cbe_pmd_regs __iomem *pmd_regs;
82 pmd_regs = cbe_get_cpu_pmd_regs(sysdev->id);
83 value = in_be64(&pmd_regs->ts_ctsr2);
85 /* access the corresponding byte */
87 /* clear all other bits */
89 /* temp is stored in steps of 2 degrees */
91 /* base temp is 65 degrees */
94 return sprintf(buf, "%d\n", (int) value);
98 /* shows the temperature of the DTS on the PPE,
99 * located near the linear thermal sensor */
100 static ssize_t ppe_show_temp0(struct sys_device *sysdev, char *buf)
102 return ppe_show_temp(sysdev, buf, 32);
105 /* shows the temperature of the second DTS on the PPE */
106 static ssize_t ppe_show_temp1(struct sys_device *sysdev, char *buf)
108 return ppe_show_temp(sysdev, buf, 0);
111 static struct sysdev_attribute attr_spu_temperature = {
112 .attr = {.name = "temperature", .mode = 0400 },
113 .show = spu_show_temp,
116 static struct attribute *spu_attributes[] = {
117 &attr_spu_temperature.attr,
120 static struct attribute_group spu_attribute_group = {
122 .attrs = spu_attributes,
125 static struct sysdev_attribute attr_ppe_temperature0 = {
126 .attr = {.name = "temperature0", .mode = 0400 },
127 .show = ppe_show_temp0,
130 static struct sysdev_attribute attr_ppe_temperature1 = {
131 .attr = {.name = "temperature1", .mode = 0400 },
132 .show = ppe_show_temp1,
135 static struct attribute *ppe_attributes[] = {
136 &attr_ppe_temperature0.attr,
137 &attr_ppe_temperature1.attr,
140 static struct attribute_group ppe_attribute_group = {
142 .attrs = ppe_attributes,
146 * initialize throttling with default values
148 static void __init init_default_values(void)
151 struct cbe_pmd_regs __iomem *pmd_regs;
152 struct sys_device *sysdev;
153 union ppe_spe_reg tpr;
162 * 08 - dynamic throttling starts if over 80 degrees
163 * 03 - dynamic throttling ceases if below 70 degrees */
166 * 10 - full stopped when over 96 degrees
167 * 08 - dynamic throttling starts if over 80 degrees
168 * 03 - dynamic throttling ceases if below 70 degrees
174 * 10 - stop 16 of 32 cycles
176 str1.val = 0x1010101010101010ull;
178 * 10 - stop 16 of 32 cycles
184 * 4 - normal operation
186 cr1.val = 0x0404040404040404ull;
188 * 4 - normal operation
192 for_each_possible_cpu (cpu) {
193 pr_debug("processing cpu %d\n", cpu);
194 sysdev = get_cpu_sysdev(cpu);
195 pmd_regs = cbe_get_cpu_pmd_regs(sysdev->id);
197 out_be64(&pmd_regs->tm_str2, str2);
198 out_be64(&pmd_regs->tm_str1.val, str1.val);
199 out_be64(&pmd_regs->tm_tpr.val, tpr.val);
200 out_be64(&pmd_regs->tm_cr1.val, cr1.val);
201 out_be64(&pmd_regs->tm_cr2, cr2);
206 static int __init thermal_init(void)
208 init_default_values();
210 spu_add_sysdev_attr_group(&spu_attribute_group);
211 cpu_add_sysdev_attr_group(&ppe_attribute_group);
215 module_init(thermal_init);
217 static void __exit thermal_exit(void)
219 spu_remove_sysdev_attr_group(&spu_attribute_group);
220 cpu_remove_sysdev_attr_group(&ppe_attribute_group);
222 module_exit(thermal_exit);
224 MODULE_LICENSE("GPL");
225 MODULE_AUTHOR("Christian Krafft <krafft@de.ibm.com>");