1 /*
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>
17 #include <linux/completion.h>
18 #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
27 #define VERSION "0.4"
28
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
37 static int smu_supports_new_fans_ops = 1;
38
39 /*
40 * SMU fans control object
41 */
42
43 static LIST_HEAD(smu_fans);
44
45 struct 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
55 static int smu_set_fan(int pwm, u8 id, u16 value)
56 {
57 struct smu_cmd cmd;
58 u8 buffer[16];
59 DECLARE_COMPLETION(comp);
60 int rc;
61
62 /* Fill SMU command structure */
63 cmd.cmd = SMU_CMD_FAN_COMMAND;
64
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
88 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 = ∁
93
94 rc = smu_queue_cmd(&cmd);
95 if (rc)
96 return rc;
97 wait_for_completion(&comp);
98
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
107 return cmd.status;
108 }
109
110 static 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
117 static 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
130 static 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
137 static 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
143 static 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
149 static 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
158 static struct smu_fan_control *smu_fan_create(struct device_node *node,
159 int pwm_fan)
160 {
161 struct smu_fan_control *fct;
162 s32 *v; u32 *reg;
163 char *l;
164
165 fct = kmalloc(sizeof(struct smu_fan_control), GFP_KERNEL);
166 if (fct == NULL)
167 return NULL;
168 fct->ctrl.ops = &smu_fan_ops;
169 l = (char *)get_property(node, "location", NULL);
170 if (l == NULL)
171 goto fail;
172
173 fct->fan_type = pwm_fan;
174 fct->ctrl.type = pwm_fan ? WF_CONTROL_PWM_FAN : WF_CONTROL_RPM_FAN;
175
176 /* We use the name & location here the same way we do for SMU sensors,
177 * see the comment in windfarm_smu_sensors.c. The locations are a bit
178 * less consistent here between the iMac and the desktop models, but
179 * that is good enough for our needs for now at least.
180 *
181 * One problem though is that Apple seem to be inconsistent with case
182 * and the kernel doesn't have strcasecmp =P
183 */
184
185 fct->ctrl.name = NULL;
186
187 /* Names used on desktop models */
188 if (!strcmp(l, "Rear Fan 0") || !strcmp(l, "Rear Fan") ||
189 !strcmp(l, "Rear fan 0") || !strcmp(l, "Rear fan") ||
190 !strcmp(l, "CPU A EXHAUST"))
191 fct->ctrl.name = "cpu-rear-fan-0";
192 else if (!strcmp(l, "Rear Fan 1") || !strcmp(l, "Rear fan 1") ||
193 !strcmp(l, "CPU B EXHAUST"))
194 fct->ctrl.name = "cpu-rear-fan-1";
195 else if (!strcmp(l, "Front Fan 0") || !strcmp(l, "Front Fan") ||
196 !strcmp(l, "Front fan 0") || !strcmp(l, "Front fan") ||
197 !strcmp(l, "CPU A INTAKE"))
198 fct->ctrl.name = "cpu-front-fan-0";
199 else if (!strcmp(l, "Front Fan 1") || !strcmp(l, "Front fan 1") ||
200 !strcmp(l, "CPU B INTAKE"))
201 fct->ctrl.name = "cpu-front-fan-1";
202 else if (!strcmp(l, "CPU A PUMP"))
203 fct->ctrl.name = "cpu-pump-0";
204 else if (!strcmp(l, "Slots Fan") || !strcmp(l, "Slots fan") ||
205 !strcmp(l, "EXPANSION SLOTS INTAKE"))
206 fct->ctrl.name = "slots-fan";
207 else if (!strcmp(l, "Drive Bay") || !strcmp(l, "Drive bay") ||
208 !strcmp(l, "DRIVE BAY A INTAKE"))
209 fct->ctrl.name = "drive-bay-fan";
210 else if (!strcmp(l, "BACKSIDE"))
211 fct->ctrl.name = "backside-fan";
212
213 /* Names used on iMac models */
214 if (!strcmp(l, "System Fan") || !strcmp(l, "System fan"))
215 fct->ctrl.name = "system-fan";
216 else if (!strcmp(l, "CPU Fan") || !strcmp(l, "CPU fan"))
217 fct->ctrl.name = "cpu-fan";
218 else if (!strcmp(l, "Hard Drive") || !strcmp(l, "Hard drive"))
219 fct->ctrl.name = "drive-bay-fan";
220
221 /* Unrecognized fan, bail out */
222 if (fct->ctrl.name == NULL)
223 goto fail;
224
225 /* Get min & max values*/
226 v = (s32 *)get_property(node, "min-value", NULL);
227 if (v == NULL)
228 goto fail;
229 fct->min = *v;
230 v = (s32 *)get_property(node, "max-value", NULL);
231 if (v == NULL)
232 goto fail;
233 fct->max = *v;
234
235 /* Get "reg" value */
236 reg = (u32 *)get_property(node, "reg", NULL);
237 if (reg == NULL)
238 goto fail;
239 fct->reg = *reg;
240
241 if (wf_register_control(&fct->ctrl))
242 goto fail;
243
244 return fct;
245 fail:
246 kfree(fct);
247 return NULL;
248 }
249
250
251 static int __init smu_controls_init(void)
252 {
253 struct device_node *smu, *fans, *fan;
254
255 if (!smu_present())
256 return -ENODEV;
257
258 smu = of_find_node_by_type(NULL, "smu");
259 if (smu == NULL)
260 return -ENODEV;
261
262 /* Look for RPM fans */
263 for (fans = NULL; (fans = of_get_next_child(smu, fans)) != NULL;)
264 if (!strcmp(fans->name, "rpm-fans") ||
265 device_is_compatible(fans, "smu-rpm-fans"))
266 break;
267 for (fan = NULL;
268 fans && (fan = of_get_next_child(fans, fan)) != NULL;) {
269 struct smu_fan_control *fct;
270
271 fct = smu_fan_create(fan, 0);
272 if (fct == NULL) {
273 printk(KERN_WARNING "windfarm: Failed to create SMU "
274 "RPM fan %s\n", fan->name);
275 continue;
276 }
277 list_add(&fct->link, &smu_fans);
278 }
279 of_node_put(fans);
280
281
282 /* Look for PWM fans */
283 for (fans = NULL; (fans = of_get_next_child(smu, fans)) != NULL;)
284 if (!strcmp(fans->name, "pwm-fans"))
285 break;
286 for (fan = NULL;
287 fans && (fan = of_get_next_child(fans, fan)) != NULL;) {
288 struct smu_fan_control *fct;
289
290 fct = smu_fan_create(fan, 1);
291 if (fct == NULL) {
292 printk(KERN_WARNING "windfarm: Failed to create SMU "
293 "PWM fan %s\n", fan->name);
294 continue;
295 }
296 list_add(&fct->link, &smu_fans);
297 }
298 of_node_put(fans);
299 of_node_put(smu);
300
301 return 0;
302 }
303
304 static void __exit smu_controls_exit(void)
305 {
306 struct smu_fan_control *fct;
307
308 while (!list_empty(&smu_fans)) {
309 fct = list_entry(smu_fans.next, struct smu_fan_control, link);
310 list_del(&fct->link);
311 wf_unregister_control(&fct->ctrl);
312 }
313 }
314
315
316 module_init(smu_controls_init);
317 module_exit(smu_controls_exit);
318
319 MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
320 MODULE_DESCRIPTION("SMU control objects for PowerMacs thermal control");
321 MODULE_LICENSE("GPL");
322
323
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