blob: d87f5ee04ca9b3c1638e99c7a0655256d7fc8e66 [file] [log] [blame]
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +11001/*
2 * Windfarm PowerMac thermal control. SMU "satellite" controller sensors.
3 *
4 * Copyright (C) 2005 Paul Mackerras, IBM Corp. <paulus@samba.org>
5 *
6 * Released under the terms of the GNU GPL v2.
7 */
8
9#include <linux/types.h>
10#include <linux/errno.h>
11#include <linux/kernel.h>
12#include <linux/slab.h>
13#include <linux/init.h>
14#include <linux/wait.h>
15#include <linux/i2c.h>
Daniel Walker56783c52008-05-03 06:34:02 +100016#include <linux/mutex.h>
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +110017#include <asm/prom.h>
18#include <asm/smu.h>
19#include <asm/pmac_low_i2c.h>
20
21#include "windfarm.h"
22
Benjamin Herrenschmidte326b302012-04-18 22:16:46 +000023#define VERSION "1.0"
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +110024
25#define DEBUG
26
27#ifdef DEBUG
28#define DBG(args...) printk(args)
29#else
30#define DBG(args...) do { } while(0)
31#endif
32
33/* If the cache is older than 800ms we'll refetch it */
34#define MAX_AGE msecs_to_jiffies(800)
35
36struct wf_sat {
Benjamin Herrenschmidte326b302012-04-18 22:16:46 +000037 struct kref ref;
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +110038 int nr;
Daniel Walker56783c52008-05-03 06:34:02 +100039 struct mutex mutex;
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +110040 unsigned long last_read; /* jiffies when cache last updated */
41 u8 cache[16];
Benjamin Herrenschmidte326b302012-04-18 22:16:46 +000042 struct list_head sensors;
Jean Delvare351ca3e2009-06-15 18:01:51 +020043 struct i2c_client *i2c;
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +110044 struct device_node *node;
45};
46
47static struct wf_sat *sats[2];
48
49struct wf_sat_sensor {
Benjamin Herrenschmidte326b302012-04-18 22:16:46 +000050 struct list_head link;
51 int index;
52 int index2; /* used for power sensors */
53 int shift;
54 struct wf_sat *sat;
55 struct wf_sensor sens;
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +110056};
57
58#define wf_to_sat(c) container_of(c, struct wf_sat_sensor, sens)
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +110059
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +110060struct smu_sdbp_header *smu_sat_get_sdb_partition(unsigned int sat_id, int id,
61 unsigned int *size)
62{
63 struct wf_sat *sat;
64 int err;
65 unsigned int i, len;
66 u8 *buf;
67 u8 data[4];
68
69 /* TODO: Add the resulting partition to the device-tree */
70
71 if (sat_id > 1 || (sat = sats[sat_id]) == NULL)
72 return NULL;
73
Jean Delvare351ca3e2009-06-15 18:01:51 +020074 err = i2c_smbus_write_word_data(sat->i2c, 8, id << 8);
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +110075 if (err) {
76 printk(KERN_ERR "smu_sat_get_sdb_part wr error %d\n", err);
77 return NULL;
78 }
79
Jean Delvare351ca3e2009-06-15 18:01:51 +020080 err = i2c_smbus_read_word_data(sat->i2c, 9);
roel kluin2fd091f2008-11-29 01:17:27 +000081 if (err < 0) {
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +110082 printk(KERN_ERR "smu_sat_get_sdb_part rd len error\n");
83 return NULL;
84 }
roel kluin2fd091f2008-11-29 01:17:27 +000085 len = err;
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +110086 if (len == 0) {
87 printk(KERN_ERR "smu_sat_get_sdb_part no partition %x\n", id);
88 return NULL;
89 }
90
91 len = le16_to_cpu(len);
92 len = (len + 3) & ~3;
93 buf = kmalloc(len, GFP_KERNEL);
94 if (buf == NULL)
95 return NULL;
96
97 for (i = 0; i < len; i += 4) {
Jean Delvare351ca3e2009-06-15 18:01:51 +020098 err = i2c_smbus_read_i2c_block_data(sat->i2c, 0xa, 4, data);
Jean Delvare4b2643d2007-07-12 14:12:29 +020099 if (err < 0) {
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100100 printk(KERN_ERR "smu_sat_get_sdb_part rd err %d\n",
101 err);
102 goto fail;
103 }
104 buf[i] = data[1];
105 buf[i+1] = data[0];
106 buf[i+2] = data[3];
107 buf[i+3] = data[2];
108 }
109#ifdef DEBUG
110 DBG(KERN_DEBUG "sat %d partition %x:", sat_id, id);
111 for (i = 0; i < len; ++i)
112 DBG(" %x", buf[i]);
113 DBG("\n");
114#endif
115
116 if (size)
117 *size = len;
118 return (struct smu_sdbp_header *) buf;
119
120 fail:
121 kfree(buf);
122 return NULL;
123}
Johannes Berg9127dd12006-02-17 13:52:54 -0800124EXPORT_SYMBOL_GPL(smu_sat_get_sdb_partition);
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100125
126/* refresh the cache */
127static int wf_sat_read_cache(struct wf_sat *sat)
128{
129 int err;
130
Jean Delvare351ca3e2009-06-15 18:01:51 +0200131 err = i2c_smbus_read_i2c_block_data(sat->i2c, 0x3f, 16, sat->cache);
Jean Delvare4b2643d2007-07-12 14:12:29 +0200132 if (err < 0)
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100133 return err;
134 sat->last_read = jiffies;
135#ifdef LOTSA_DEBUG
136 {
137 int i;
138 DBG(KERN_DEBUG "wf_sat_get: data is");
139 for (i = 0; i < 16; ++i)
140 DBG(" %.2x", sat->cache[i]);
141 DBG("\n");
142 }
143#endif
144 return 0;
145}
146
Benjamin Herrenschmidte326b302012-04-18 22:16:46 +0000147static int wf_sat_sensor_get(struct wf_sensor *sr, s32 *value)
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100148{
149 struct wf_sat_sensor *sens = wf_to_sat(sr);
150 struct wf_sat *sat = sens->sat;
151 int i, err;
152 s32 val;
153
Jean Delvare351ca3e2009-06-15 18:01:51 +0200154 if (sat->i2c == NULL)
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100155 return -ENODEV;
156
Daniel Walker56783c52008-05-03 06:34:02 +1000157 mutex_lock(&sat->mutex);
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100158 if (time_after(jiffies, (sat->last_read + MAX_AGE))) {
159 err = wf_sat_read_cache(sat);
160 if (err)
161 goto fail;
162 }
163
164 i = sens->index * 2;
165 val = ((sat->cache[i] << 8) + sat->cache[i+1]) << sens->shift;
166 if (sens->index2 >= 0) {
167 i = sens->index2 * 2;
168 /* 4.12 * 8.8 -> 12.20; shift right 4 to get 16.16 */
169 val = (val * ((sat->cache[i] << 8) + sat->cache[i+1])) >> 4;
170 }
171
172 *value = val;
173 err = 0;
174
175 fail:
Daniel Walker56783c52008-05-03 06:34:02 +1000176 mutex_unlock(&sat->mutex);
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100177 return err;
178}
179
Benjamin Herrenschmidte326b302012-04-18 22:16:46 +0000180static void wf_sat_release(struct kref *ref)
181{
182 struct wf_sat *sat = container_of(ref, struct wf_sat, ref);
183
184 if (sat->nr >= 0)
185 sats[sat->nr] = NULL;
186 kfree(sat);
187}
188
189static void wf_sat_sensor_release(struct wf_sensor *sr)
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100190{
191 struct wf_sat_sensor *sens = wf_to_sat(sr);
192 struct wf_sat *sat = sens->sat;
193
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100194 kfree(sens);
Benjamin Herrenschmidte326b302012-04-18 22:16:46 +0000195 kref_put(&sat->ref, wf_sat_release);
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100196}
197
198static struct wf_sensor_ops wf_sat_ops = {
Benjamin Herrenschmidte326b302012-04-18 22:16:46 +0000199 .get_value = wf_sat_sensor_get,
200 .release = wf_sat_sensor_release,
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100201 .owner = THIS_MODULE,
202};
203
Jean Delvare351ca3e2009-06-15 18:01:51 +0200204static int wf_sat_probe(struct i2c_client *client,
205 const struct i2c_device_id *id)
206{
Benjamin Herrenschmidt9525a082012-05-08 13:28:37 +1000207 struct device_node *dev = client->dev.of_node;
Jean Delvare351ca3e2009-06-15 18:01:51 +0200208 struct wf_sat *sat;
209 struct wf_sat_sensor *sens;
210 const u32 *reg;
211 const char *loc, *type;
212 u8 chip, core;
213 struct device_node *child;
214 int shift, cpu, index;
215 char *name;
216 int vsens[2], isens[2];
217
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100218 sat = kzalloc(sizeof(struct wf_sat), GFP_KERNEL);
219 if (sat == NULL)
Jean Delvare351ca3e2009-06-15 18:01:51 +0200220 return -ENOMEM;
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100221 sat->nr = -1;
222 sat->node = of_node_get(dev);
Benjamin Herrenschmidte326b302012-04-18 22:16:46 +0000223 kref_init(&sat->ref);
Daniel Walker56783c52008-05-03 06:34:02 +1000224 mutex_init(&sat->mutex);
Jean Delvare351ca3e2009-06-15 18:01:51 +0200225 sat->i2c = client;
Benjamin Herrenschmidte326b302012-04-18 22:16:46 +0000226 INIT_LIST_HEAD(&sat->sensors);
Jean Delvare351ca3e2009-06-15 18:01:51 +0200227 i2c_set_clientdata(client, sat);
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100228
229 vsens[0] = vsens[1] = -1;
230 isens[0] = isens[1] = -1;
231 child = NULL;
232 while ((child = of_get_next_child(dev, child)) != NULL) {
Stephen Rothwell01b27262007-04-27 13:41:15 +1000233 reg = of_get_property(child, "reg", NULL);
234 type = of_get_property(child, "device_type", NULL);
235 loc = of_get_property(child, "location", NULL);
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100236 if (reg == NULL || loc == NULL)
237 continue;
238
239 /* the cooked sensors are between 0x30 and 0x37 */
240 if (*reg < 0x30 || *reg > 0x37)
241 continue;
242 index = *reg - 0x30;
243
244 /* expect location to be CPU [AB][01] ... */
245 if (strncmp(loc, "CPU ", 4) != 0)
246 continue;
247 chip = loc[4] - 'A';
248 core = loc[5] - '0';
249 if (chip > 1 || core > 1) {
250 printk(KERN_ERR "wf_sat_create: don't understand "
251 "location %s for %s\n", loc, child->full_name);
252 continue;
253 }
254 cpu = 2 * chip + core;
255 if (sat->nr < 0)
256 sat->nr = chip;
257 else if (sat->nr != chip) {
258 printk(KERN_ERR "wf_sat_create: can't cope with "
259 "multiple CPU chips on one SAT (%s)\n", loc);
260 continue;
261 }
262
263 if (strcmp(type, "voltage-sensor") == 0) {
264 name = "cpu-voltage";
265 shift = 4;
266 vsens[core] = index;
267 } else if (strcmp(type, "current-sensor") == 0) {
268 name = "cpu-current";
269 shift = 8;
270 isens[core] = index;
271 } else if (strcmp(type, "temp-sensor") == 0) {
272 name = "cpu-temp";
273 shift = 10;
274 } else
275 continue; /* hmmm shouldn't happen */
276
277 /* the +16 is enough for "cpu-voltage-n" */
278 sens = kzalloc(sizeof(struct wf_sat_sensor) + 16, GFP_KERNEL);
279 if (sens == NULL) {
280 printk(KERN_ERR "wf_sat_create: couldn't create "
281 "%s sensor %d (no memory)\n", name, cpu);
282 continue;
283 }
284 sens->index = index;
285 sens->index2 = -1;
286 sens->shift = shift;
287 sens->sat = sat;
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100288 sens->sens.ops = &wf_sat_ops;
289 sens->sens.name = (char *) (sens + 1);
Stephen Rothwell43671cc2012-05-02 20:19:43 +0000290 snprintf((char *)sens->sens.name, 16, "%s-%d", name, cpu);
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100291
Benjamin Herrenschmidte326b302012-04-18 22:16:46 +0000292 if (wf_register_sensor(&sens->sens))
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100293 kfree(sens);
Benjamin Herrenschmidte326b302012-04-18 22:16:46 +0000294 else {
295 list_add(&sens->link, &sat->sensors);
296 kref_get(&sat->ref);
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100297 }
298 }
299
300 /* make the power sensors */
301 for (core = 0; core < 2; ++core) {
302 if (vsens[core] < 0 || isens[core] < 0)
303 continue;
304 cpu = 2 * sat->nr + core;
305 sens = kzalloc(sizeof(struct wf_sat_sensor) + 16, GFP_KERNEL);
306 if (sens == NULL) {
307 printk(KERN_ERR "wf_sat_create: couldn't create power "
308 "sensor %d (no memory)\n", cpu);
309 continue;
310 }
311 sens->index = vsens[core];
312 sens->index2 = isens[core];
313 sens->shift = 0;
314 sens->sat = sat;
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100315 sens->sens.ops = &wf_sat_ops;
316 sens->sens.name = (char *) (sens + 1);
Stephen Rothwell43671cc2012-05-02 20:19:43 +0000317 snprintf((char *)sens->sens.name, 16, "cpu-power-%d", cpu);
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100318
Benjamin Herrenschmidte326b302012-04-18 22:16:46 +0000319 if (wf_register_sensor(&sens->sens))
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100320 kfree(sens);
Benjamin Herrenschmidte326b302012-04-18 22:16:46 +0000321 else {
322 list_add(&sens->link, &sat->sensors);
323 kref_get(&sat->ref);
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100324 }
325 }
326
327 if (sat->nr >= 0)
328 sats[sat->nr] = sat;
329
Jean Delvare351ca3e2009-06-15 18:01:51 +0200330 return 0;
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100331}
332
Jean Delvare351ca3e2009-06-15 18:01:51 +0200333static int wf_sat_remove(struct i2c_client *client)
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100334{
Jean Delvare351ca3e2009-06-15 18:01:51 +0200335 struct wf_sat *sat = i2c_get_clientdata(client);
Benjamin Herrenschmidte326b302012-04-18 22:16:46 +0000336 struct wf_sat_sensor *sens;
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100337
Benjamin Herrenschmidte326b302012-04-18 22:16:46 +0000338 /* release sensors */
339 while(!list_empty(&sat->sensors)) {
340 sens = list_first_entry(&sat->sensors,
341 struct wf_sat_sensor, link);
342 list_del(&sens->link);
343 wf_unregister_sensor(&sens->sens);
344 }
Jean Delvare351ca3e2009-06-15 18:01:51 +0200345 sat->i2c = NULL;
Benjamin Herrenschmidte326b302012-04-18 22:16:46 +0000346 i2c_set_clientdata(client, NULL);
347 kref_put(&sat->ref, wf_sat_release);
348
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100349 return 0;
350}
351
Jean Delvare351ca3e2009-06-15 18:01:51 +0200352static const struct i2c_device_id wf_sat_id[] = {
Benjamin Herrenschmidte326b302012-04-18 22:16:46 +0000353 { "MAC,smu-sat", 0 },
Jean Delvare351ca3e2009-06-15 18:01:51 +0200354 { }
355};
Benjamin Herrenschmidte326b302012-04-18 22:16:46 +0000356MODULE_DEVICE_TABLE(i2c, wf_sat_id);
Jean Delvare351ca3e2009-06-15 18:01:51 +0200357
358static struct i2c_driver wf_sat_driver = {
359 .driver = {
360 .name = "wf_smu_sat",
361 },
Jean Delvare351ca3e2009-06-15 18:01:51 +0200362 .probe = wf_sat_probe,
363 .remove = wf_sat_remove,
364 .id_table = wf_sat_id,
365};
366
Wei Yongjunf7fb8622012-10-08 03:00:04 +0000367module_i2c_driver(wf_sat_driver);
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100368
369MODULE_AUTHOR("Paul Mackerras <paulus@samba.org>");
370MODULE_DESCRIPTION("SMU satellite sensors for PowerMac thermal control");
371MODULE_LICENSE("GPL");