aboutsummaryrefslogtreecommitdiff
path: root/arch/powerpc/platforms/cell/cbe_thermal.c
blob: 17831a92d91e15de08c6021c3f13ddb769d6084e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
/*
 * 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>");