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Commit | Line | Data |
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75722d39 BH |
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> | |
de25968c | 17 | #include <linux/completion.h> |
75722d39 BH |
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 | ||
ac171c46 | 27 | #define VERSION "0.4" |
75722d39 BH |
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 | ||
ac171c46 BH |
37 | static int smu_supports_new_fans_ops = 1; |
38 | ||
75722d39 BH |
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]; | |
6e9a4738 | 59 | DECLARE_COMPLETION_ONSTACK(comp); |
75722d39 BH |
60 | int rc; |
61 | ||
62 | /* Fill SMU command structure */ | |
63 | cmd.cmd = SMU_CMD_FAN_COMMAND; | |
ac171c46 BH |
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 | ||
75722d39 BH |
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 | ||
75722d39 BH |
94 | rc = smu_queue_cmd(&cmd); |
95 | if (rc) | |
96 | return rc; | |
97 | wait_for_completion(&comp); | |
ac171c46 BH |
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 | ||
75722d39 BH |
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; | |
018a3d1d JK |
162 | const s32 *v; |
163 | const u32 *reg; | |
164 | const char *l; | |
75722d39 BH |
165 | |
166 | fct = kmalloc(sizeof(struct smu_fan_control), GFP_KERNEL); | |
167 | if (fct == NULL) | |
168 | return NULL; | |
169 | fct->ctrl.ops = &smu_fan_ops; | |
01b2726d | 170 | l = of_get_property(node, "location", NULL); |
75722d39 BH |
171 | 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") || | |
ac171c46 BH |
190 | !strcmp(l, "Rear fan 0") || !strcmp(l, "Rear fan") || |
191 | !strcmp(l, "CPU A EXHAUST")) | |
75722d39 | 192 | fct->ctrl.name = "cpu-rear-fan-0"; |
ac171c46 BH |
193 | else if (!strcmp(l, "Rear Fan 1") || !strcmp(l, "Rear fan 1") || |
194 | !strcmp(l, "CPU B EXHAUST")) | |
75722d39 BH |
195 | fct->ctrl.name = "cpu-rear-fan-1"; |
196 | else if (!strcmp(l, "Front Fan 0") || !strcmp(l, "Front Fan") || | |
ac171c46 BH |
197 | !strcmp(l, "Front fan 0") || !strcmp(l, "Front fan") || |
198 | !strcmp(l, "CPU A INTAKE")) | |
75722d39 | 199 | fct->ctrl.name = "cpu-front-fan-0"; |
ac171c46 BH |
200 | else if (!strcmp(l, "Front Fan 1") || !strcmp(l, "Front fan 1") || |
201 | !strcmp(l, "CPU B INTAKE")) | |
75722d39 | 202 | fct->ctrl.name = "cpu-front-fan-1"; |
ac171c46 BH |
203 | 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")) | |
75722d39 | 207 | fct->ctrl.name = "slots-fan"; |
ac171c46 BH |
208 | else if (!strcmp(l, "Drive Bay") || !strcmp(l, "Drive bay") || |
209 | !strcmp(l, "DRIVE BAY A INTAKE")) | |
75722d39 | 210 | fct->ctrl.name = "drive-bay-fan"; |
ac171c46 BH |
211 | else if (!strcmp(l, "BACKSIDE")) |
212 | fct->ctrl.name = "backside-fan"; | |
75722d39 BH |
213 | |
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"; | |
80ff974d ÉB |
221 | else if (!strcmp(l, "HDD Fan")) /* seen on iMac G5 iSight */ |
222 | fct->ctrl.name = "hard-drive-fan"; | |
223 | else if (!strcmp(l, "ODD Fan")) /* same */ | |
224 | fct->ctrl.name = "optical-drive-fan"; | |
75722d39 BH |
225 | |
226 | /* Unrecognized fan, bail out */ | |
227 | if (fct->ctrl.name == NULL) | |
228 | goto fail; | |
229 | ||
230 | /* Get min & max values*/ | |
01b2726d | 231 | v = of_get_property(node, "min-value", NULL); |
75722d39 BH |
232 | if (v == NULL) |
233 | goto fail; | |
234 | fct->min = *v; | |
01b2726d | 235 | v = of_get_property(node, "max-value", NULL); |
75722d39 BH |
236 | if (v == NULL) |
237 | goto fail; | |
238 | fct->max = *v; | |
239 | ||
240 | /* Get "reg" value */ | |
01b2726d | 241 | reg = of_get_property(node, "reg", NULL); |
75722d39 BH |
242 | if (reg == NULL) |
243 | goto fail; | |
244 | fct->reg = *reg; | |
245 | ||
246 | if (wf_register_control(&fct->ctrl)) | |
247 | goto fail; | |
248 | ||
249 | return fct; | |
250 | fail: | |
251 | kfree(fct); | |
252 | return NULL; | |
253 | } | |
254 | ||
255 | ||
256 | static int __init smu_controls_init(void) | |
257 | { | |
258 | struct device_node *smu, *fans, *fan; | |
259 | ||
260 | if (!smu_present()) | |
261 | return -ENODEV; | |
262 | ||
263 | smu = of_find_node_by_type(NULL, "smu"); | |
264 | if (smu == NULL) | |
265 | return -ENODEV; | |
266 | ||
267 | /* Look for RPM fans */ | |
268 | for (fans = NULL; (fans = of_get_next_child(smu, fans)) != NULL;) | |
ac171c46 | 269 | if (!strcmp(fans->name, "rpm-fans") || |
55b61fec | 270 | of_device_is_compatible(fans, "smu-rpm-fans")) |
75722d39 BH |
271 | break; |
272 | for (fan = NULL; | |
273 | fans && (fan = of_get_next_child(fans, fan)) != NULL;) { | |
274 | struct smu_fan_control *fct; | |
275 | ||
276 | fct = smu_fan_create(fan, 0); | |
277 | if (fct == NULL) { | |
278 | printk(KERN_WARNING "windfarm: Failed to create SMU " | |
279 | "RPM fan %s\n", fan->name); | |
280 | continue; | |
281 | } | |
282 | list_add(&fct->link, &smu_fans); | |
283 | } | |
284 | of_node_put(fans); | |
285 | ||
286 | ||
287 | /* Look for PWM fans */ | |
288 | for (fans = NULL; (fans = of_get_next_child(smu, fans)) != NULL;) | |
289 | if (!strcmp(fans->name, "pwm-fans")) | |
290 | break; | |
291 | for (fan = NULL; | |
292 | fans && (fan = of_get_next_child(fans, fan)) != NULL;) { | |
293 | struct smu_fan_control *fct; | |
294 | ||
295 | fct = smu_fan_create(fan, 1); | |
296 | if (fct == NULL) { | |
297 | printk(KERN_WARNING "windfarm: Failed to create SMU " | |
298 | "PWM fan %s\n", fan->name); | |
299 | continue; | |
300 | } | |
301 | list_add(&fct->link, &smu_fans); | |
302 | } | |
303 | of_node_put(fans); | |
304 | of_node_put(smu); | |
305 | ||
306 | return 0; | |
307 | } | |
308 | ||
309 | static void __exit smu_controls_exit(void) | |
310 | { | |
311 | struct smu_fan_control *fct; | |
312 | ||
313 | while (!list_empty(&smu_fans)) { | |
314 | fct = list_entry(smu_fans.next, struct smu_fan_control, link); | |
315 | list_del(&fct->link); | |
316 | wf_unregister_control(&fct->ctrl); | |
317 | } | |
318 | } | |
319 | ||
320 | ||
321 | module_init(smu_controls_init); | |
322 | module_exit(smu_controls_exit); | |
323 | ||
324 | MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); | |
325 | MODULE_DESCRIPTION("SMU control objects for PowerMacs thermal control"); | |
326 | MODULE_LICENSE("GPL"); | |
327 |