blob: 58c2590f05ecd587770127ffeb55ee37b7c55cc3 [file] [log] [blame]
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +11001/*
2 * Windfarm PowerMac thermal control. SMU based controls
3 *
4 * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
5 * <benh@kernel.crashing.org>
6 *
7 * Released under the term of the GNU GPL v2.
8 */
9
10#include <linux/types.h>
11#include <linux/errno.h>
12#include <linux/kernel.h>
13#include <linux/delay.h>
14#include <linux/slab.h>
15#include <linux/init.h>
16#include <linux/wait.h>
Tim Schmielaude259682006-01-08 01:02:05 -080017#include <linux/completion.h>
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +110018#include <asm/prom.h>
19#include <asm/machdep.h>
20#include <asm/io.h>
21#include <asm/system.h>
22#include <asm/sections.h>
23#include <asm/smu.h>
24
25#include "windfarm.h"
26
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +110027#define VERSION "0.4"
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +110028
29#undef DEBUG
30
31#ifdef DEBUG
32#define DBG(args...) printk(args)
33#else
34#define DBG(args...) do { } while(0)
35#endif
36
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +110037static int smu_supports_new_fans_ops = 1;
38
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +110039/*
40 * SMU fans control object
41 */
42
43static LIST_HEAD(smu_fans);
44
45struct smu_fan_control {
46 struct list_head link;
47 int fan_type; /* 0 = rpm, 1 = pwm */
48 u32 reg; /* index in SMU */
49 s32 value; /* current value */
50 s32 min, max; /* min/max values */
51 struct wf_control ctrl;
52};
53#define to_smu_fan(c) container_of(c, struct smu_fan_control, ctrl)
54
55static int smu_set_fan(int pwm, u8 id, u16 value)
56{
57 struct smu_cmd cmd;
58 u8 buffer[16];
Peter Zijlstra6e9a4732006-09-30 23:28:10 -070059 DECLARE_COMPLETION_ONSTACK(comp);
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +110060 int rc;
61
62 /* Fill SMU command structure */
63 cmd.cmd = SMU_CMD_FAN_COMMAND;
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +110064
65 /* The SMU has an "old" and a "new" way of setting the fan speed
66 * Unfortunately, I found no reliable way to know which one works
67 * on a given machine model. After some investigations it appears
68 * that MacOS X just tries the new one, and if it fails fallbacks
69 * to the old ones ... Ugh.
70 */
71 retry:
72 if (smu_supports_new_fans_ops) {
73 buffer[0] = 0x30;
74 buffer[1] = id;
75 *((u16 *)(&buffer[2])) = value;
76 cmd.data_len = 4;
77 } else {
78 if (id > 7)
79 return -EINVAL;
80 /* Fill argument buffer */
81 memset(buffer, 0, 16);
82 buffer[0] = pwm ? 0x10 : 0x00;
83 buffer[1] = 0x01 << id;
84 *((u16 *)&buffer[2 + id * 2]) = value;
85 cmd.data_len = 14;
86 }
87
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +110088 cmd.reply_len = 16;
89 cmd.data_buf = cmd.reply_buf = buffer;
90 cmd.status = 0;
91 cmd.done = smu_done_complete;
92 cmd.misc = &comp;
93
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +110094 rc = smu_queue_cmd(&cmd);
95 if (rc)
96 return rc;
97 wait_for_completion(&comp);
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +110098
99 /* Handle fallback (see coment above) */
100 if (cmd.status != 0 && smu_supports_new_fans_ops) {
101 printk(KERN_WARNING "windfarm: SMU failed new fan command "
102 "falling back to old method\n");
103 smu_supports_new_fans_ops = 0;
104 goto retry;
105 }
106
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100107 return cmd.status;
108}
109
110static void smu_fan_release(struct wf_control *ct)
111{
112 struct smu_fan_control *fct = to_smu_fan(ct);
113
114 kfree(fct);
115}
116
117static int smu_fan_set(struct wf_control *ct, s32 value)
118{
119 struct smu_fan_control *fct = to_smu_fan(ct);
120
121 if (value < fct->min)
122 value = fct->min;
123 if (value > fct->max)
124 value = fct->max;
125 fct->value = value;
126
127 return smu_set_fan(fct->fan_type, fct->reg, value);
128}
129
130static int smu_fan_get(struct wf_control *ct, s32 *value)
131{
132 struct smu_fan_control *fct = to_smu_fan(ct);
133 *value = fct->value; /* todo: read from SMU */
134 return 0;
135}
136
137static s32 smu_fan_min(struct wf_control *ct)
138{
139 struct smu_fan_control *fct = to_smu_fan(ct);
140 return fct->min;
141}
142
143static s32 smu_fan_max(struct wf_control *ct)
144{
145 struct smu_fan_control *fct = to_smu_fan(ct);
146 return fct->max;
147}
148
149static struct wf_control_ops smu_fan_ops = {
150 .set_value = smu_fan_set,
151 .get_value = smu_fan_get,
152 .get_min = smu_fan_min,
153 .get_max = smu_fan_max,
154 .release = smu_fan_release,
155 .owner = THIS_MODULE,
156};
157
158static struct smu_fan_control *smu_fan_create(struct device_node *node,
159 int pwm_fan)
160{
161 struct smu_fan_control *fct;
Jeremy Kerr018a3d12006-07-12 15:40:29 +1000162 const s32 *v;
163 const u32 *reg;
164 const char *l;
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100165
166 fct = kmalloc(sizeof(struct smu_fan_control), GFP_KERNEL);
167 if (fct == NULL)
168 return NULL;
169 fct->ctrl.ops = &smu_fan_ops;
Stephen Rothwell01b27262007-04-27 13:41:15 +1000170 l = of_get_property(node, "location", NULL);
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100171 if (l == NULL)
172 goto fail;
173
174 fct->fan_type = pwm_fan;
175 fct->ctrl.type = pwm_fan ? WF_CONTROL_PWM_FAN : WF_CONTROL_RPM_FAN;
176
177 /* We use the name & location here the same way we do for SMU sensors,
178 * see the comment in windfarm_smu_sensors.c. The locations are a bit
179 * less consistent here between the iMac and the desktop models, but
180 * that is good enough for our needs for now at least.
181 *
182 * One problem though is that Apple seem to be inconsistent with case
183 * and the kernel doesn't have strcasecmp =P
184 */
185
186 fct->ctrl.name = NULL;
187
188 /* Names used on desktop models */
189 if (!strcmp(l, "Rear Fan 0") || !strcmp(l, "Rear Fan") ||
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100190 !strcmp(l, "Rear fan 0") || !strcmp(l, "Rear fan") ||
191 !strcmp(l, "CPU A EXHAUST"))
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100192 fct->ctrl.name = "cpu-rear-fan-0";
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100193 else if (!strcmp(l, "Rear Fan 1") || !strcmp(l, "Rear fan 1") ||
194 !strcmp(l, "CPU B EXHAUST"))
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100195 fct->ctrl.name = "cpu-rear-fan-1";
196 else if (!strcmp(l, "Front Fan 0") || !strcmp(l, "Front Fan") ||
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100197 !strcmp(l, "Front fan 0") || !strcmp(l, "Front fan") ||
198 !strcmp(l, "CPU A INTAKE"))
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100199 fct->ctrl.name = "cpu-front-fan-0";
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100200 else if (!strcmp(l, "Front Fan 1") || !strcmp(l, "Front fan 1") ||
201 !strcmp(l, "CPU B INTAKE"))
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100202 fct->ctrl.name = "cpu-front-fan-1";
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100203 else if (!strcmp(l, "CPU A PUMP"))
204 fct->ctrl.name = "cpu-pump-0";
205 else if (!strcmp(l, "Slots Fan") || !strcmp(l, "Slots fan") ||
206 !strcmp(l, "EXPANSION SLOTS INTAKE"))
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100207 fct->ctrl.name = "slots-fan";
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100208 else if (!strcmp(l, "Drive Bay") || !strcmp(l, "Drive bay") ||
209 !strcmp(l, "DRIVE BAY A INTAKE"))
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100210 fct->ctrl.name = "drive-bay-fan";
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100211 else if (!strcmp(l, "BACKSIDE"))
212 fct->ctrl.name = "backside-fan";
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100213
214 /* Names used on iMac models */
215 if (!strcmp(l, "System Fan") || !strcmp(l, "System fan"))
216 fct->ctrl.name = "system-fan";
217 else if (!strcmp(l, "CPU Fan") || !strcmp(l, "CPU fan"))
218 fct->ctrl.name = "cpu-fan";
219 else if (!strcmp(l, "Hard Drive") || !strcmp(l, "Hard drive"))
220 fct->ctrl.name = "drive-bay-fan";
221
222 /* Unrecognized fan, bail out */
223 if (fct->ctrl.name == NULL)
224 goto fail;
225
226 /* Get min & max values*/
Stephen Rothwell01b27262007-04-27 13:41:15 +1000227 v = of_get_property(node, "min-value", NULL);
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100228 if (v == NULL)
229 goto fail;
230 fct->min = *v;
Stephen Rothwell01b27262007-04-27 13:41:15 +1000231 v = of_get_property(node, "max-value", NULL);
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100232 if (v == NULL)
233 goto fail;
234 fct->max = *v;
235
236 /* Get "reg" value */
Stephen Rothwell01b27262007-04-27 13:41:15 +1000237 reg = of_get_property(node, "reg", NULL);
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100238 if (reg == NULL)
239 goto fail;
240 fct->reg = *reg;
241
242 if (wf_register_control(&fct->ctrl))
243 goto fail;
244
245 return fct;
246 fail:
247 kfree(fct);
248 return NULL;
249}
250
251
252static int __init smu_controls_init(void)
253{
254 struct device_node *smu, *fans, *fan;
255
256 if (!smu_present())
257 return -ENODEV;
258
259 smu = of_find_node_by_type(NULL, "smu");
260 if (smu == NULL)
261 return -ENODEV;
262
263 /* Look for RPM fans */
264 for (fans = NULL; (fans = of_get_next_child(smu, fans)) != NULL;)
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100265 if (!strcmp(fans->name, "rpm-fans") ||
Stephen Rothwell55b61fe2007-05-03 17:26:52 +1000266 of_device_is_compatible(fans, "smu-rpm-fans"))
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100267 break;
268 for (fan = NULL;
269 fans && (fan = of_get_next_child(fans, fan)) != NULL;) {
270 struct smu_fan_control *fct;
271
272 fct = smu_fan_create(fan, 0);
273 if (fct == NULL) {
274 printk(KERN_WARNING "windfarm: Failed to create SMU "
275 "RPM fan %s\n", fan->name);
276 continue;
277 }
278 list_add(&fct->link, &smu_fans);
279 }
280 of_node_put(fans);
281
282
283 /* Look for PWM fans */
284 for (fans = NULL; (fans = of_get_next_child(smu, fans)) != NULL;)
285 if (!strcmp(fans->name, "pwm-fans"))
286 break;
287 for (fan = NULL;
288 fans && (fan = of_get_next_child(fans, fan)) != NULL;) {
289 struct smu_fan_control *fct;
290
291 fct = smu_fan_create(fan, 1);
292 if (fct == NULL) {
293 printk(KERN_WARNING "windfarm: Failed to create SMU "
294 "PWM fan %s\n", fan->name);
295 continue;
296 }
297 list_add(&fct->link, &smu_fans);
298 }
299 of_node_put(fans);
300 of_node_put(smu);
301
302 return 0;
303}
304
305static void __exit smu_controls_exit(void)
306{
307 struct smu_fan_control *fct;
308
309 while (!list_empty(&smu_fans)) {
310 fct = list_entry(smu_fans.next, struct smu_fan_control, link);
311 list_del(&fct->link);
312 wf_unregister_control(&fct->ctrl);
313 }
314}
315
316
317module_init(smu_controls_init);
318module_exit(smu_controls_exit);
319
320MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
321MODULE_DESCRIPTION("SMU control objects for PowerMacs thermal control");
322MODULE_LICENSE("GPL");
323