video: tegra: host: module debugger framework
[linux-3.10.git] / drivers / macintosh / windfarm_smu_sat.c
1 /*
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>
16 #include <linux/mutex.h>
17 #include <asm/prom.h>
18 #include <asm/smu.h>
19 #include <asm/pmac_low_i2c.h>
20
21 #include "windfarm.h"
22
23 #define VERSION "1.0"
24
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
36 struct wf_sat {
37         struct kref             ref;
38         int                     nr;
39         struct mutex            mutex;
40         unsigned long           last_read; /* jiffies when cache last updated */
41         u8                      cache[16];
42         struct list_head        sensors;
43         struct i2c_client       *i2c;
44         struct device_node      *node;
45 };
46
47 static struct wf_sat *sats[2];
48
49 struct wf_sat_sensor {
50         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;
56 };
57
58 #define wf_to_sat(c)    container_of(c, struct wf_sat_sensor, sens)
59
60 struct 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
74         err = i2c_smbus_write_word_data(sat->i2c, 8, id << 8);
75         if (err) {
76                 printk(KERN_ERR "smu_sat_get_sdb_part wr error %d\n", err);
77                 return NULL;
78         }
79
80         err = i2c_smbus_read_word_data(sat->i2c, 9);
81         if (err < 0) {
82                 printk(KERN_ERR "smu_sat_get_sdb_part rd len error\n");
83                 return NULL;
84         }
85         len = err;
86         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) {
98                 err = i2c_smbus_read_i2c_block_data(sat->i2c, 0xa, 4, data);
99                 if (err < 0) {
100                         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 }
124 EXPORT_SYMBOL_GPL(smu_sat_get_sdb_partition);
125
126 /* refresh the cache */
127 static int wf_sat_read_cache(struct wf_sat *sat)
128 {
129         int err;
130
131         err = i2c_smbus_read_i2c_block_data(sat->i2c, 0x3f, 16, sat->cache);
132         if (err < 0)
133                 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
147 static int wf_sat_sensor_get(struct wf_sensor *sr, s32 *value)
148 {
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
154         if (sat->i2c == NULL)
155                 return -ENODEV;
156
157         mutex_lock(&sat->mutex);
158         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:
176         mutex_unlock(&sat->mutex);
177         return err;
178 }
179
180 static 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
189 static void wf_sat_sensor_release(struct wf_sensor *sr)
190 {
191         struct wf_sat_sensor *sens = wf_to_sat(sr);
192         struct wf_sat *sat = sens->sat;
193
194         kfree(sens);
195         kref_put(&sat->ref, wf_sat_release);
196 }
197
198 static struct wf_sensor_ops wf_sat_ops = {
199         .get_value      = wf_sat_sensor_get,
200         .release        = wf_sat_sensor_release,
201         .owner          = THIS_MODULE,
202 };
203
204 static int wf_sat_probe(struct i2c_client *client,
205                         const struct i2c_device_id *id)
206 {
207         struct device_node *dev = client->dev.of_node;
208         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
218         sat = kzalloc(sizeof(struct wf_sat), GFP_KERNEL);
219         if (sat == NULL)
220                 return -ENOMEM;
221         sat->nr = -1;
222         sat->node = of_node_get(dev);
223         kref_init(&sat->ref);
224         mutex_init(&sat->mutex);
225         sat->i2c = client;
226         INIT_LIST_HEAD(&sat->sensors);
227         i2c_set_clientdata(client, sat);
228
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) {
233                 reg = of_get_property(child, "reg", NULL);
234                 type = of_get_property(child, "device_type", NULL);
235                 loc = of_get_property(child, "location", NULL);
236                 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;
288                 sens->sens.ops = &wf_sat_ops;
289                 sens->sens.name = (char *) (sens + 1);
290                 snprintf((char *)sens->sens.name, 16, "%s-%d", name, cpu);
291
292                 if (wf_register_sensor(&sens->sens))
293                         kfree(sens);
294                 else {
295                         list_add(&sens->link, &sat->sensors);
296                         kref_get(&sat->ref);
297                 }
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;
315                 sens->sens.ops = &wf_sat_ops;
316                 sens->sens.name = (char *) (sens + 1);
317                 snprintf((char *)sens->sens.name, 16, "cpu-power-%d", cpu);
318
319                 if (wf_register_sensor(&sens->sens))
320                         kfree(sens);
321                 else {
322                         list_add(&sens->link, &sat->sensors);
323                         kref_get(&sat->ref);
324                 }
325         }
326
327         if (sat->nr >= 0)
328                 sats[sat->nr] = sat;
329
330         return 0;
331 }
332
333 static int wf_sat_remove(struct i2c_client *client)
334 {
335         struct wf_sat *sat = i2c_get_clientdata(client);
336         struct wf_sat_sensor *sens;
337
338         /* 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         }
345         sat->i2c = NULL;
346         i2c_set_clientdata(client, NULL);
347         kref_put(&sat->ref, wf_sat_release);
348
349         return 0;
350 }
351
352 static const struct i2c_device_id wf_sat_id[] = {
353         { "MAC,smu-sat", 0 },
354         { }
355 };
356 MODULE_DEVICE_TABLE(i2c, wf_sat_id);
357
358 static struct i2c_driver wf_sat_driver = {
359         .driver = {
360                 .name           = "wf_smu_sat",
361         },
362         .probe          = wf_sat_probe,
363         .remove         = wf_sat_remove,
364         .id_table       = wf_sat_id,
365 };
366
367 module_i2c_driver(wf_sat_driver);
368
369 MODULE_AUTHOR("Paul Mackerras <paulus@samba.org>");
370 MODULE_DESCRIPTION("SMU satellite sensors for PowerMac thermal control");
371 MODULE_LICENSE("GPL");