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Commit | Line | Data |
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b3d7dc19 CK |
1 | /* |
2 | * thermal support for the cell processor | |
3 | * | |
5f7bdaee CK |
4 | * This module adds some sysfs attributes to cpu and spu nodes. |
5 | * Base for measurements are the digital thermal sensors (DTS) | |
6 | * located on the chip. | |
7 | * The accuracy is 2 degrees, starting from 65 up to 125 degrees celsius | |
8 | * The attributes can be found under | |
9 | * /sys/devices/system/cpu/cpuX/thermal | |
10 | * /sys/devices/system/spu/spuX/thermal | |
11 | * | |
12 | * The following attributes are added for each node: | |
13 | * temperature: | |
14 | * contains the current temperature measured by the DTS | |
15 | * throttle_begin: | |
16 | * throttling begins when temperature is greater or equal to | |
17 | * throttle_begin. Setting this value to 125 prevents throttling. | |
18 | * throttle_end: | |
19 | * throttling is being ceased, if the temperature is lower than | |
20 | * throttle_end. Due to a delay between applying throttling and | |
21 | * a reduced temperature this value should be less than throttle_begin. | |
22 | * A value equal to throttle_begin provides only a very little hysteresis. | |
23 | * throttle_full_stop: | |
24 | * If the temperatrue is greater or equal to throttle_full_stop, | |
25 | * full throttling is applied to the cpu or spu. This value should be | |
26 | * greater than throttle_begin and throttle_end. Setting this value to | |
27 | * 65 prevents the unit from running code at all. | |
28 | * | |
b3d7dc19 CK |
29 | * (C) Copyright IBM Deutschland Entwicklung GmbH 2005 |
30 | * | |
31 | * Author: Christian Krafft <krafft@de.ibm.com> | |
32 | * | |
33 | * This program is free software; you can redistribute it and/or modify | |
34 | * it under the terms of the GNU General Public License as published by | |
35 | * the Free Software Foundation; either version 2, or (at your option) | |
36 | * any later version. | |
37 | * | |
38 | * This program is distributed in the hope that it will be useful, | |
39 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
40 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
41 | * GNU General Public License for more details. | |
42 | * | |
43 | * You should have received a copy of the GNU General Public License | |
44 | * along with this program; if not, write to the Free Software | |
45 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
46 | */ | |
47 | ||
48 | #include <linux/module.h> | |
8a25a2fd | 49 | #include <linux/device.h> |
b3d7dc19 CK |
50 | #include <linux/kernel.h> |
51 | #include <linux/cpu.h> | |
5c35a02c | 52 | #include <linux/stringify.h> |
b3d7dc19 CK |
53 | #include <asm/spu.h> |
54 | #include <asm/io.h> | |
55 | #include <asm/prom.h> | |
eef686a0 | 56 | #include <asm/cell-regs.h> |
b3d7dc19 | 57 | |
e28b0031 | 58 | #include "spu_priv1_mmio.h" |
b3d7dc19 | 59 | |
5f7bdaee CK |
60 | #define TEMP_MIN 65 |
61 | #define TEMP_MAX 125 | |
62 | ||
8a25a2fd KS |
63 | #define DEVICE_PREFIX_ATTR(_prefix,_name,_mode) \ |
64 | struct device_attribute attr_ ## _prefix ## _ ## _name = { \ | |
5f7bdaee CK |
65 | .attr = { .name = __stringify(_name), .mode = _mode }, \ |
66 | .show = _prefix ## _show_ ## _name, \ | |
67 | .store = _prefix ## _store_ ## _name, \ | |
68 | }; | |
69 | ||
24d560d7 CK |
70 | static inline u8 reg_to_temp(u8 reg_value) |
71 | { | |
5f7bdaee CK |
72 | return ((reg_value & 0x3f) << 1) + TEMP_MIN; |
73 | } | |
74 | ||
75 | static inline u8 temp_to_reg(u8 temp) | |
76 | { | |
77 | return ((temp - TEMP_MIN) >> 1) & 0x3f; | |
24d560d7 CK |
78 | } |
79 | ||
8a25a2fd | 80 | static struct cbe_pmd_regs __iomem *get_pmd_regs(struct device *dev) |
b3d7dc19 CK |
81 | { |
82 | struct spu *spu; | |
83 | ||
8a25a2fd | 84 | spu = container_of(dev, struct spu, dev); |
b3d7dc19 | 85 | |
e28b0031 | 86 | return cbe_get_pmd_regs(spu_devnode(spu)); |
b3d7dc19 CK |
87 | } |
88 | ||
89 | /* returns the value for a given spu in a given register */ | |
8a25a2fd | 90 | static u8 spu_read_register_value(struct device *dev, union spe_reg __iomem *reg) |
b3d7dc19 | 91 | { |
b3d7dc19 CK |
92 | union spe_reg value; |
93 | struct spu *spu; | |
94 | ||
8a25a2fd | 95 | spu = container_of(dev, struct spu, dev); |
b3d7dc19 CK |
96 | value.val = in_be64(®->val); |
97 | ||
fa7f374b | 98 | return value.spe[spu->spe_id]; |
b3d7dc19 CK |
99 | } |
100 | ||
8a25a2fd | 101 | static ssize_t spu_show_temp(struct device *dev, struct device_attribute *attr, |
4a0b2b4d | 102 | char *buf) |
b3d7dc19 | 103 | { |
24d560d7 | 104 | u8 value; |
b3d7dc19 CK |
105 | struct cbe_pmd_regs __iomem *pmd_regs; |
106 | ||
8a25a2fd | 107 | pmd_regs = get_pmd_regs(dev); |
b3d7dc19 | 108 | |
8a25a2fd | 109 | value = spu_read_register_value(dev, &pmd_regs->ts_ctsr1); |
24d560d7 CK |
110 | |
111 | return sprintf(buf, "%d\n", reg_to_temp(value)); | |
b3d7dc19 CK |
112 | } |
113 | ||
5f7bdaee CK |
114 | static ssize_t show_throttle(struct cbe_pmd_regs __iomem *pmd_regs, char *buf, int pos) |
115 | { | |
116 | u64 value; | |
117 | ||
118 | value = in_be64(&pmd_regs->tm_tpr.val); | |
119 | /* access the corresponding byte */ | |
120 | value >>= pos; | |
121 | value &= 0x3F; | |
122 | ||
123 | return sprintf(buf, "%d\n", reg_to_temp(value)); | |
124 | } | |
125 | ||
126 | static ssize_t store_throttle(struct cbe_pmd_regs __iomem *pmd_regs, const char *buf, size_t size, int pos) | |
127 | { | |
128 | u64 reg_value; | |
f5fc8229 | 129 | unsigned int temp; |
5f7bdaee CK |
130 | u64 new_value; |
131 | int ret; | |
132 | ||
133 | ret = sscanf(buf, "%u", &temp); | |
134 | ||
135 | if (ret != 1 || temp < TEMP_MIN || temp > TEMP_MAX) | |
136 | return -EINVAL; | |
137 | ||
138 | new_value = temp_to_reg(temp); | |
139 | ||
140 | reg_value = in_be64(&pmd_regs->tm_tpr.val); | |
141 | ||
142 | /* zero out bits for new value */ | |
143 | reg_value &= ~(0xffull << pos); | |
144 | /* set bits to new value */ | |
145 | reg_value |= new_value << pos; | |
146 | ||
147 | out_be64(&pmd_regs->tm_tpr.val, reg_value); | |
148 | return size; | |
149 | } | |
150 | ||
8a25a2fd KS |
151 | static ssize_t spu_show_throttle_end(struct device *dev, |
152 | struct device_attribute *attr, char *buf) | |
5f7bdaee | 153 | { |
8a25a2fd | 154 | return show_throttle(get_pmd_regs(dev), buf, 0); |
5f7bdaee CK |
155 | } |
156 | ||
8a25a2fd KS |
157 | static ssize_t spu_show_throttle_begin(struct device *dev, |
158 | struct device_attribute *attr, char *buf) | |
5f7bdaee | 159 | { |
8a25a2fd | 160 | return show_throttle(get_pmd_regs(dev), buf, 8); |
5f7bdaee CK |
161 | } |
162 | ||
8a25a2fd KS |
163 | static ssize_t spu_show_throttle_full_stop(struct device *dev, |
164 | struct device_attribute *attr, char *buf) | |
5f7bdaee | 165 | { |
8a25a2fd | 166 | return show_throttle(get_pmd_regs(dev), buf, 16); |
5f7bdaee CK |
167 | } |
168 | ||
8a25a2fd KS |
169 | static ssize_t spu_store_throttle_end(struct device *dev, |
170 | struct device_attribute *attr, const char *buf, size_t size) | |
5f7bdaee | 171 | { |
8a25a2fd | 172 | return store_throttle(get_pmd_regs(dev), buf, size, 0); |
5f7bdaee CK |
173 | } |
174 | ||
8a25a2fd KS |
175 | static ssize_t spu_store_throttle_begin(struct device *dev, |
176 | struct device_attribute *attr, const char *buf, size_t size) | |
5f7bdaee | 177 | { |
8a25a2fd | 178 | return store_throttle(get_pmd_regs(dev), buf, size, 8); |
5f7bdaee CK |
179 | } |
180 | ||
8a25a2fd KS |
181 | static ssize_t spu_store_throttle_full_stop(struct device *dev, |
182 | struct device_attribute *attr, const char *buf, size_t size) | |
5f7bdaee | 183 | { |
8a25a2fd | 184 | return store_throttle(get_pmd_regs(dev), buf, size, 16); |
5f7bdaee CK |
185 | } |
186 | ||
8a25a2fd | 187 | static ssize_t ppe_show_temp(struct device *dev, char *buf, int pos) |
b3d7dc19 CK |
188 | { |
189 | struct cbe_pmd_regs __iomem *pmd_regs; | |
190 | u64 value; | |
191 | ||
8a25a2fd | 192 | pmd_regs = cbe_get_cpu_pmd_regs(dev->id); |
b3d7dc19 CK |
193 | value = in_be64(&pmd_regs->ts_ctsr2); |
194 | ||
24d560d7 | 195 | value = (value >> pos) & 0x3f; |
b3d7dc19 | 196 | |
24d560d7 | 197 | return sprintf(buf, "%d\n", reg_to_temp(value)); |
b3d7dc19 CK |
198 | } |
199 | ||
200 | ||
201 | /* shows the temperature of the DTS on the PPE, | |
202 | * located near the linear thermal sensor */ | |
8a25a2fd KS |
203 | static ssize_t ppe_show_temp0(struct device *dev, |
204 | struct device_attribute *attr, char *buf) | |
b3d7dc19 | 205 | { |
8a25a2fd | 206 | return ppe_show_temp(dev, buf, 32); |
b3d7dc19 CK |
207 | } |
208 | ||
209 | /* shows the temperature of the second DTS on the PPE */ | |
8a25a2fd KS |
210 | static ssize_t ppe_show_temp1(struct device *dev, |
211 | struct device_attribute *attr, char *buf) | |
b3d7dc19 | 212 | { |
8a25a2fd | 213 | return ppe_show_temp(dev, buf, 0); |
b3d7dc19 CK |
214 | } |
215 | ||
8a25a2fd KS |
216 | static ssize_t ppe_show_throttle_end(struct device *dev, |
217 | struct device_attribute *attr, char *buf) | |
5f7bdaee | 218 | { |
8a25a2fd | 219 | return show_throttle(cbe_get_cpu_pmd_regs(dev->id), buf, 32); |
5f7bdaee CK |
220 | } |
221 | ||
8a25a2fd KS |
222 | static ssize_t ppe_show_throttle_begin(struct device *dev, |
223 | struct device_attribute *attr, char *buf) | |
5f7bdaee | 224 | { |
8a25a2fd | 225 | return show_throttle(cbe_get_cpu_pmd_regs(dev->id), buf, 40); |
5f7bdaee CK |
226 | } |
227 | ||
8a25a2fd KS |
228 | static ssize_t ppe_show_throttle_full_stop(struct device *dev, |
229 | struct device_attribute *attr, char *buf) | |
5f7bdaee | 230 | { |
8a25a2fd | 231 | return show_throttle(cbe_get_cpu_pmd_regs(dev->id), buf, 48); |
5f7bdaee CK |
232 | } |
233 | ||
8a25a2fd KS |
234 | static ssize_t ppe_store_throttle_end(struct device *dev, |
235 | struct device_attribute *attr, const char *buf, size_t size) | |
5f7bdaee | 236 | { |
8a25a2fd | 237 | return store_throttle(cbe_get_cpu_pmd_regs(dev->id), buf, size, 32); |
5f7bdaee CK |
238 | } |
239 | ||
8a25a2fd KS |
240 | static ssize_t ppe_store_throttle_begin(struct device *dev, |
241 | struct device_attribute *attr, const char *buf, size_t size) | |
5f7bdaee | 242 | { |
8a25a2fd | 243 | return store_throttle(cbe_get_cpu_pmd_regs(dev->id), buf, size, 40); |
5f7bdaee CK |
244 | } |
245 | ||
8a25a2fd KS |
246 | static ssize_t ppe_store_throttle_full_stop(struct device *dev, |
247 | struct device_attribute *attr, const char *buf, size_t size) | |
5f7bdaee | 248 | { |
8a25a2fd | 249 | return store_throttle(cbe_get_cpu_pmd_regs(dev->id), buf, size, 48); |
5f7bdaee CK |
250 | } |
251 | ||
252 | ||
8a25a2fd | 253 | static struct device_attribute attr_spu_temperature = { |
b3d7dc19 CK |
254 | .attr = {.name = "temperature", .mode = 0400 }, |
255 | .show = spu_show_temp, | |
256 | }; | |
257 | ||
8a25a2fd KS |
258 | static DEVICE_PREFIX_ATTR(spu, throttle_end, 0600); |
259 | static DEVICE_PREFIX_ATTR(spu, throttle_begin, 0600); | |
260 | static DEVICE_PREFIX_ATTR(spu, throttle_full_stop, 0600); | |
5f7bdaee CK |
261 | |
262 | ||
b3d7dc19 CK |
263 | static struct attribute *spu_attributes[] = { |
264 | &attr_spu_temperature.attr, | |
5f7bdaee CK |
265 | &attr_spu_throttle_end.attr, |
266 | &attr_spu_throttle_begin.attr, | |
267 | &attr_spu_throttle_full_stop.attr, | |
22b6e590 | 268 | NULL, |
b3d7dc19 CK |
269 | }; |
270 | ||
271 | static struct attribute_group spu_attribute_group = { | |
272 | .name = "thermal", | |
273 | .attrs = spu_attributes, | |
274 | }; | |
275 | ||
8a25a2fd | 276 | static struct device_attribute attr_ppe_temperature0 = { |
b3d7dc19 CK |
277 | .attr = {.name = "temperature0", .mode = 0400 }, |
278 | .show = ppe_show_temp0, | |
279 | }; | |
280 | ||
8a25a2fd | 281 | static struct device_attribute attr_ppe_temperature1 = { |
b3d7dc19 CK |
282 | .attr = {.name = "temperature1", .mode = 0400 }, |
283 | .show = ppe_show_temp1, | |
284 | }; | |
285 | ||
8a25a2fd KS |
286 | static DEVICE_PREFIX_ATTR(ppe, throttle_end, 0600); |
287 | static DEVICE_PREFIX_ATTR(ppe, throttle_begin, 0600); | |
288 | static DEVICE_PREFIX_ATTR(ppe, throttle_full_stop, 0600); | |
5f7bdaee | 289 | |
b3d7dc19 CK |
290 | static struct attribute *ppe_attributes[] = { |
291 | &attr_ppe_temperature0.attr, | |
292 | &attr_ppe_temperature1.attr, | |
5f7bdaee CK |
293 | &attr_ppe_throttle_end.attr, |
294 | &attr_ppe_throttle_begin.attr, | |
295 | &attr_ppe_throttle_full_stop.attr, | |
22b6e590 | 296 | NULL, |
b3d7dc19 CK |
297 | }; |
298 | ||
299 | static struct attribute_group ppe_attribute_group = { | |
300 | .name = "thermal", | |
301 | .attrs = ppe_attributes, | |
302 | }; | |
303 | ||
304 | /* | |
305 | * initialize throttling with default values | |
306 | */ | |
827e3648 | 307 | static int __init init_default_values(void) |
b3d7dc19 CK |
308 | { |
309 | int cpu; | |
310 | struct cbe_pmd_regs __iomem *pmd_regs; | |
8a25a2fd | 311 | struct device *dev; |
b3d7dc19 CK |
312 | union ppe_spe_reg tpr; |
313 | union spe_reg str1; | |
314 | u64 str2; | |
315 | union spe_reg cr1; | |
316 | u64 cr2; | |
317 | ||
318 | /* TPR defaults */ | |
319 | /* ppe | |
320 | * 1F - no full stop | |
321 | * 08 - dynamic throttling starts if over 80 degrees | |
322 | * 03 - dynamic throttling ceases if below 70 degrees */ | |
323 | tpr.ppe = 0x1F0803; | |
324 | /* spe | |
325 | * 10 - full stopped when over 96 degrees | |
326 | * 08 - dynamic throttling starts if over 80 degrees | |
327 | * 03 - dynamic throttling ceases if below 70 degrees | |
328 | */ | |
329 | tpr.spe = 0x100803; | |
330 | ||
331 | /* STR defaults */ | |
332 | /* str1 | |
333 | * 10 - stop 16 of 32 cycles | |
334 | */ | |
335 | str1.val = 0x1010101010101010ull; | |
336 | /* str2 | |
337 | * 10 - stop 16 of 32 cycles | |
338 | */ | |
339 | str2 = 0x10; | |
340 | ||
341 | /* CR defaults */ | |
342 | /* cr1 | |
343 | * 4 - normal operation | |
344 | */ | |
345 | cr1.val = 0x0404040404040404ull; | |
346 | /* cr2 | |
347 | * 4 - normal operation | |
348 | */ | |
349 | cr2 = 0x04; | |
350 | ||
351 | for_each_possible_cpu (cpu) { | |
352 | pr_debug("processing cpu %d\n", cpu); | |
8a25a2fd | 353 | dev = get_cpu_device(cpu); |
827e3648 | 354 | |
8a25a2fd KS |
355 | if (!dev) { |
356 | pr_info("invalid dev pointer for cbe_thermal\n"); | |
827e3648 JCD |
357 | return -EINVAL; |
358 | } | |
359 | ||
8a25a2fd | 360 | pmd_regs = cbe_get_cpu_pmd_regs(dev->id); |
b3d7dc19 | 361 | |
827e3648 JCD |
362 | if (!pmd_regs) { |
363 | pr_info("invalid CBE regs pointer for cbe_thermal\n"); | |
364 | return -EINVAL; | |
365 | } | |
366 | ||
b3d7dc19 CK |
367 | out_be64(&pmd_regs->tm_str2, str2); |
368 | out_be64(&pmd_regs->tm_str1.val, str1.val); | |
369 | out_be64(&pmd_regs->tm_tpr.val, tpr.val); | |
370 | out_be64(&pmd_regs->tm_cr1.val, cr1.val); | |
371 | out_be64(&pmd_regs->tm_cr2, cr2); | |
372 | } | |
827e3648 JCD |
373 | |
374 | return 0; | |
b3d7dc19 CK |
375 | } |
376 | ||
377 | ||
378 | static int __init thermal_init(void) | |
379 | { | |
827e3648 | 380 | int rc = init_default_values(); |
b3d7dc19 | 381 | |
827e3648 | 382 | if (rc == 0) { |
8a25a2fd KS |
383 | spu_add_dev_attr_group(&spu_attribute_group); |
384 | cpu_add_dev_attr_group(&ppe_attribute_group); | |
827e3648 | 385 | } |
b3d7dc19 | 386 | |
827e3648 | 387 | return rc; |
b3d7dc19 CK |
388 | } |
389 | module_init(thermal_init); | |
390 | ||
391 | static void __exit thermal_exit(void) | |
392 | { | |
8a25a2fd KS |
393 | spu_remove_dev_attr_group(&spu_attribute_group); |
394 | cpu_remove_dev_attr_group(&ppe_attribute_group); | |
b3d7dc19 CK |
395 | } |
396 | module_exit(thermal_exit); | |
397 | ||
398 | MODULE_LICENSE("GPL"); | |
399 | MODULE_AUTHOR("Christian Krafft <krafft@de.ibm.com>"); | |
400 |