2 * Windfarm PowerMac thermal control. SMU based controls
4 * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
5 * <benh@kernel.crashing.org>
7 * Released under the term of the GNU GPL v2.
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>
19 #include <asm/machdep.h>
21 #include <asm/sections.h>
31 #define DBG(args...) printk(args)
33 #define DBG(args...) do { } while(0)
36 static int smu_supports_new_fans_ops = 1;
39 * SMU fans control object
42 static LIST_HEAD(smu_fans);
44 struct smu_fan_control {
45 struct list_head link;
46 int fan_type; /* 0 = rpm, 1 = pwm */
47 u32 reg; /* index in SMU */
48 s32 value; /* current value */
49 s32 min, max; /* min/max values */
50 struct wf_control ctrl;
52 #define to_smu_fan(c) container_of(c, struct smu_fan_control, ctrl)
54 static int smu_set_fan(int pwm, u8 id, u16 value)
58 DECLARE_COMPLETION_ONSTACK(comp);
61 /* Fill SMU command structure */
62 cmd.cmd = SMU_CMD_FAN_COMMAND;
64 /* The SMU has an "old" and a "new" way of setting the fan speed
65 * Unfortunately, I found no reliable way to know which one works
66 * on a given machine model. After some investigations it appears
67 * that MacOS X just tries the new one, and if it fails fallbacks
68 * to the old ones ... Ugh.
71 if (smu_supports_new_fans_ops) {
74 *((u16 *)(&buffer[2])) = value;
79 /* Fill argument buffer */
80 memset(buffer, 0, 16);
81 buffer[0] = pwm ? 0x10 : 0x00;
82 buffer[1] = 0x01 << id;
83 *((u16 *)&buffer[2 + id * 2]) = value;
88 cmd.data_buf = cmd.reply_buf = buffer;
90 cmd.done = smu_done_complete;
93 rc = smu_queue_cmd(&cmd);
96 wait_for_completion(&comp);
98 /* Handle fallback (see coment above) */
99 if (cmd.status != 0 && smu_supports_new_fans_ops) {
100 printk(KERN_WARNING "windfarm: SMU failed new fan command "
101 "falling back to old method\n");
102 smu_supports_new_fans_ops = 0;
109 static void smu_fan_release(struct wf_control *ct)
111 struct smu_fan_control *fct = to_smu_fan(ct);
116 static int smu_fan_set(struct wf_control *ct, s32 value)
118 struct smu_fan_control *fct = to_smu_fan(ct);
120 if (value < fct->min)
122 if (value > fct->max)
126 return smu_set_fan(fct->fan_type, fct->reg, value);
129 static int smu_fan_get(struct wf_control *ct, s32 *value)
131 struct smu_fan_control *fct = to_smu_fan(ct);
132 *value = fct->value; /* todo: read from SMU */
136 static s32 smu_fan_min(struct wf_control *ct)
138 struct smu_fan_control *fct = to_smu_fan(ct);
142 static s32 smu_fan_max(struct wf_control *ct)
144 struct smu_fan_control *fct = to_smu_fan(ct);
148 static const struct wf_control_ops smu_fan_ops = {
149 .set_value = smu_fan_set,
150 .get_value = smu_fan_get,
151 .get_min = smu_fan_min,
152 .get_max = smu_fan_max,
153 .release = smu_fan_release,
154 .owner = THIS_MODULE,
157 static struct smu_fan_control *smu_fan_create(struct device_node *node,
160 struct smu_fan_control *fct;
165 fct = kmalloc(sizeof(struct smu_fan_control), GFP_KERNEL);
168 fct->ctrl.ops = &smu_fan_ops;
169 l = of_get_property(node, "location", NULL);
173 fct->fan_type = pwm_fan;
174 fct->ctrl.type = pwm_fan ? WF_CONTROL_PWM_FAN : WF_CONTROL_RPM_FAN;
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.
181 * One problem though is that Apple seem to be inconsistent with case
182 * and the kernel doesn't have strcasecmp =P
185 fct->ctrl.name = NULL;
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, "CPU B PUMP"))
205 fct->ctrl.name = "cpu-pump-1";
206 else if (!strcmp(l, "Slots Fan") || !strcmp(l, "Slots fan") ||
207 !strcmp(l, "EXPANSION SLOTS INTAKE"))
208 fct->ctrl.name = "slots-fan";
209 else if (!strcmp(l, "Drive Bay") || !strcmp(l, "Drive bay") ||
210 !strcmp(l, "DRIVE BAY A INTAKE"))
211 fct->ctrl.name = "drive-bay-fan";
212 else if (!strcmp(l, "BACKSIDE"))
213 fct->ctrl.name = "backside-fan";
215 /* Names used on iMac models */
216 if (!strcmp(l, "System Fan") || !strcmp(l, "System fan"))
217 fct->ctrl.name = "system-fan";
218 else if (!strcmp(l, "CPU Fan") || !strcmp(l, "CPU fan"))
219 fct->ctrl.name = "cpu-fan";
220 else if (!strcmp(l, "Hard Drive") || !strcmp(l, "Hard drive"))
221 fct->ctrl.name = "drive-bay-fan";
222 else if (!strcmp(l, "HDD Fan")) /* seen on iMac G5 iSight */
223 fct->ctrl.name = "hard-drive-fan";
224 else if (!strcmp(l, "ODD Fan")) /* same */
225 fct->ctrl.name = "optical-drive-fan";
227 /* Unrecognized fan, bail out */
228 if (fct->ctrl.name == NULL)
231 /* Get min & max values*/
232 v = of_get_property(node, "min-value", NULL);
236 v = of_get_property(node, "max-value", NULL);
241 /* Get "reg" value */
242 reg = of_get_property(node, "reg", NULL);
247 if (wf_register_control(&fct->ctrl))
257 static int __init smu_controls_init(void)
259 struct device_node *smu, *fans, *fan;
264 smu = of_find_node_by_type(NULL, "smu");
268 /* Look for RPM fans */
269 for (fans = NULL; (fans = of_get_next_child(smu, fans)) != NULL;)
270 if (!strcmp(fans->name, "rpm-fans") ||
271 of_device_is_compatible(fans, "smu-rpm-fans"))
274 fans && (fan = of_get_next_child(fans, fan)) != NULL;) {
275 struct smu_fan_control *fct;
277 fct = smu_fan_create(fan, 0);
279 printk(KERN_WARNING "windfarm: Failed to create SMU "
280 "RPM fan %s\n", fan->name);
283 list_add(&fct->link, &smu_fans);
288 /* Look for PWM fans */
289 for (fans = NULL; (fans = of_get_next_child(smu, fans)) != NULL;)
290 if (!strcmp(fans->name, "pwm-fans"))
293 fans && (fan = of_get_next_child(fans, fan)) != NULL;) {
294 struct smu_fan_control *fct;
296 fct = smu_fan_create(fan, 1);
298 printk(KERN_WARNING "windfarm: Failed to create SMU "
299 "PWM fan %s\n", fan->name);
302 list_add(&fct->link, &smu_fans);
310 static void __exit smu_controls_exit(void)
312 struct smu_fan_control *fct;
314 while (!list_empty(&smu_fans)) {
315 fct = list_entry(smu_fans.next, struct smu_fan_control, link);
316 list_del(&fct->link);
317 wf_unregister_control(&fct->ctrl);
322 module_init(smu_controls_init);
323 module_exit(smu_controls_exit);
325 MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
326 MODULE_DESCRIPTION("SMU control objects for PowerMacs thermal control");
327 MODULE_LICENSE("GPL");