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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> | |
17 | #include <asm/prom.h> | |
18 | #include <asm/machdep.h> | |
19 | #include <asm/io.h> | |
20 | #include <asm/system.h> | |
21 | #include <asm/sections.h> | |
22 | #include <asm/smu.h> | |
23 | ||
24 | #include "windfarm.h" | |
25 | ||
26 | #define VERSION "0.3" | |
27 | ||
28 | #undef DEBUG | |
29 | ||
30 | #ifdef DEBUG | |
31 | #define DBG(args...) printk(args) | |
32 | #else | |
33 | #define DBG(args...) do { } while(0) | |
34 | #endif | |
35 | ||
36 | /* | |
37 | * SMU fans control object | |
38 | */ | |
39 | ||
40 | static LIST_HEAD(smu_fans); | |
41 | ||
42 | struct smu_fan_control { | |
43 | struct list_head link; | |
44 | int fan_type; /* 0 = rpm, 1 = pwm */ | |
45 | u32 reg; /* index in SMU */ | |
46 | s32 value; /* current value */ | |
47 | s32 min, max; /* min/max values */ | |
48 | struct wf_control ctrl; | |
49 | }; | |
50 | #define to_smu_fan(c) container_of(c, struct smu_fan_control, ctrl) | |
51 | ||
52 | static int smu_set_fan(int pwm, u8 id, u16 value) | |
53 | { | |
54 | struct smu_cmd cmd; | |
55 | u8 buffer[16]; | |
56 | DECLARE_COMPLETION(comp); | |
57 | int rc; | |
58 | ||
59 | /* Fill SMU command structure */ | |
60 | cmd.cmd = SMU_CMD_FAN_COMMAND; | |
61 | cmd.data_len = 14; | |
62 | cmd.reply_len = 16; | |
63 | cmd.data_buf = cmd.reply_buf = buffer; | |
64 | cmd.status = 0; | |
65 | cmd.done = smu_done_complete; | |
66 | cmd.misc = ∁ | |
67 | ||
68 | /* Fill argument buffer */ | |
69 | memset(buffer, 0, 16); | |
70 | buffer[0] = pwm ? 0x10 : 0x00; | |
71 | buffer[1] = 0x01 << id; | |
72 | *((u16 *)&buffer[2 + id * 2]) = value; | |
73 | ||
74 | rc = smu_queue_cmd(&cmd); | |
75 | if (rc) | |
76 | return rc; | |
77 | wait_for_completion(&comp); | |
78 | return cmd.status; | |
79 | } | |
80 | ||
81 | static void smu_fan_release(struct wf_control *ct) | |
82 | { | |
83 | struct smu_fan_control *fct = to_smu_fan(ct); | |
84 | ||
85 | kfree(fct); | |
86 | } | |
87 | ||
88 | static int smu_fan_set(struct wf_control *ct, s32 value) | |
89 | { | |
90 | struct smu_fan_control *fct = to_smu_fan(ct); | |
91 | ||
92 | if (value < fct->min) | |
93 | value = fct->min; | |
94 | if (value > fct->max) | |
95 | value = fct->max; | |
96 | fct->value = value; | |
97 | ||
98 | return smu_set_fan(fct->fan_type, fct->reg, value); | |
99 | } | |
100 | ||
101 | static int smu_fan_get(struct wf_control *ct, s32 *value) | |
102 | { | |
103 | struct smu_fan_control *fct = to_smu_fan(ct); | |
104 | *value = fct->value; /* todo: read from SMU */ | |
105 | return 0; | |
106 | } | |
107 | ||
108 | static s32 smu_fan_min(struct wf_control *ct) | |
109 | { | |
110 | struct smu_fan_control *fct = to_smu_fan(ct); | |
111 | return fct->min; | |
112 | } | |
113 | ||
114 | static s32 smu_fan_max(struct wf_control *ct) | |
115 | { | |
116 | struct smu_fan_control *fct = to_smu_fan(ct); | |
117 | return fct->max; | |
118 | } | |
119 | ||
120 | static struct wf_control_ops smu_fan_ops = { | |
121 | .set_value = smu_fan_set, | |
122 | .get_value = smu_fan_get, | |
123 | .get_min = smu_fan_min, | |
124 | .get_max = smu_fan_max, | |
125 | .release = smu_fan_release, | |
126 | .owner = THIS_MODULE, | |
127 | }; | |
128 | ||
129 | static struct smu_fan_control *smu_fan_create(struct device_node *node, | |
130 | int pwm_fan) | |
131 | { | |
132 | struct smu_fan_control *fct; | |
133 | s32 *v; u32 *reg; | |
134 | char *l; | |
135 | ||
136 | fct = kmalloc(sizeof(struct smu_fan_control), GFP_KERNEL); | |
137 | if (fct == NULL) | |
138 | return NULL; | |
139 | fct->ctrl.ops = &smu_fan_ops; | |
140 | l = (char *)get_property(node, "location", NULL); | |
141 | if (l == NULL) | |
142 | goto fail; | |
143 | ||
144 | fct->fan_type = pwm_fan; | |
145 | fct->ctrl.type = pwm_fan ? WF_CONTROL_PWM_FAN : WF_CONTROL_RPM_FAN; | |
146 | ||
147 | /* We use the name & location here the same way we do for SMU sensors, | |
148 | * see the comment in windfarm_smu_sensors.c. The locations are a bit | |
149 | * less consistent here between the iMac and the desktop models, but | |
150 | * that is good enough for our needs for now at least. | |
151 | * | |
152 | * One problem though is that Apple seem to be inconsistent with case | |
153 | * and the kernel doesn't have strcasecmp =P | |
154 | */ | |
155 | ||
156 | fct->ctrl.name = NULL; | |
157 | ||
158 | /* Names used on desktop models */ | |
159 | if (!strcmp(l, "Rear Fan 0") || !strcmp(l, "Rear Fan") || | |
160 | !strcmp(l, "Rear fan 0") || !strcmp(l, "Rear fan")) | |
161 | fct->ctrl.name = "cpu-rear-fan-0"; | |
162 | else if (!strcmp(l, "Rear Fan 1") || !strcmp(l, "Rear fan 1")) | |
163 | fct->ctrl.name = "cpu-rear-fan-1"; | |
164 | else if (!strcmp(l, "Front Fan 0") || !strcmp(l, "Front Fan") || | |
165 | !strcmp(l, "Front fan 0") || !strcmp(l, "Front fan")) | |
166 | fct->ctrl.name = "cpu-front-fan-0"; | |
167 | else if (!strcmp(l, "Front Fan 1") || !strcmp(l, "Front fan 1")) | |
168 | fct->ctrl.name = "cpu-front-fan-1"; | |
169 | else if (!strcmp(l, "Slots Fan") || !strcmp(l, "Slots fan")) | |
170 | fct->ctrl.name = "slots-fan"; | |
171 | else if (!strcmp(l, "Drive Bay") || !strcmp(l, "Drive bay")) | |
172 | fct->ctrl.name = "drive-bay-fan"; | |
173 | ||
174 | /* Names used on iMac models */ | |
175 | if (!strcmp(l, "System Fan") || !strcmp(l, "System fan")) | |
176 | fct->ctrl.name = "system-fan"; | |
177 | else if (!strcmp(l, "CPU Fan") || !strcmp(l, "CPU fan")) | |
178 | fct->ctrl.name = "cpu-fan"; | |
179 | else if (!strcmp(l, "Hard Drive") || !strcmp(l, "Hard drive")) | |
180 | fct->ctrl.name = "drive-bay-fan"; | |
181 | ||
182 | /* Unrecognized fan, bail out */ | |
183 | if (fct->ctrl.name == NULL) | |
184 | goto fail; | |
185 | ||
186 | /* Get min & max values*/ | |
187 | v = (s32 *)get_property(node, "min-value", NULL); | |
188 | if (v == NULL) | |
189 | goto fail; | |
190 | fct->min = *v; | |
191 | v = (s32 *)get_property(node, "max-value", NULL); | |
192 | if (v == NULL) | |
193 | goto fail; | |
194 | fct->max = *v; | |
195 | ||
196 | /* Get "reg" value */ | |
197 | reg = (u32 *)get_property(node, "reg", NULL); | |
198 | if (reg == NULL) | |
199 | goto fail; | |
200 | fct->reg = *reg; | |
201 | ||
202 | if (wf_register_control(&fct->ctrl)) | |
203 | goto fail; | |
204 | ||
205 | return fct; | |
206 | fail: | |
207 | kfree(fct); | |
208 | return NULL; | |
209 | } | |
210 | ||
211 | ||
212 | static int __init smu_controls_init(void) | |
213 | { | |
214 | struct device_node *smu, *fans, *fan; | |
215 | ||
216 | if (!smu_present()) | |
217 | return -ENODEV; | |
218 | ||
219 | smu = of_find_node_by_type(NULL, "smu"); | |
220 | if (smu == NULL) | |
221 | return -ENODEV; | |
222 | ||
223 | /* Look for RPM fans */ | |
224 | for (fans = NULL; (fans = of_get_next_child(smu, fans)) != NULL;) | |
225 | if (!strcmp(fans->name, "rpm-fans")) | |
226 | break; | |
227 | for (fan = NULL; | |
228 | fans && (fan = of_get_next_child(fans, fan)) != NULL;) { | |
229 | struct smu_fan_control *fct; | |
230 | ||
231 | fct = smu_fan_create(fan, 0); | |
232 | if (fct == NULL) { | |
233 | printk(KERN_WARNING "windfarm: Failed to create SMU " | |
234 | "RPM fan %s\n", fan->name); | |
235 | continue; | |
236 | } | |
237 | list_add(&fct->link, &smu_fans); | |
238 | } | |
239 | of_node_put(fans); | |
240 | ||
241 | ||
242 | /* Look for PWM fans */ | |
243 | for (fans = NULL; (fans = of_get_next_child(smu, fans)) != NULL;) | |
244 | if (!strcmp(fans->name, "pwm-fans")) | |
245 | break; | |
246 | for (fan = NULL; | |
247 | fans && (fan = of_get_next_child(fans, fan)) != NULL;) { | |
248 | struct smu_fan_control *fct; | |
249 | ||
250 | fct = smu_fan_create(fan, 1); | |
251 | if (fct == NULL) { | |
252 | printk(KERN_WARNING "windfarm: Failed to create SMU " | |
253 | "PWM fan %s\n", fan->name); | |
254 | continue; | |
255 | } | |
256 | list_add(&fct->link, &smu_fans); | |
257 | } | |
258 | of_node_put(fans); | |
259 | of_node_put(smu); | |
260 | ||
261 | return 0; | |
262 | } | |
263 | ||
264 | static void __exit smu_controls_exit(void) | |
265 | { | |
266 | struct smu_fan_control *fct; | |
267 | ||
268 | while (!list_empty(&smu_fans)) { | |
269 | fct = list_entry(smu_fans.next, struct smu_fan_control, link); | |
270 | list_del(&fct->link); | |
271 | wf_unregister_control(&fct->ctrl); | |
272 | } | |
273 | } | |
274 | ||
275 | ||
276 | module_init(smu_controls_init); | |
277 | module_exit(smu_controls_exit); | |
278 | ||
279 | MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); | |
280 | MODULE_DESCRIPTION("SMU control objects for PowerMacs thermal control"); | |
281 | MODULE_LICENSE("GPL"); | |
282 |