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/system.h>
22 #include <asm/sections.h>
32 #define DBG(args...) printk(args)
34 #define DBG(args...) do { } while(0)
38 * SMU fans control object
41 static LIST_HEAD(smu_fans);
43 struct smu_fan_control {
44 struct list_head link;
45 int fan_type; /* 0 = rpm, 1 = pwm */
46 u32 reg; /* index in SMU */
47 s32 value; /* current value */
48 s32 min, max; /* min/max values */
49 struct wf_control ctrl;
51 #define to_smu_fan(c) container_of(c, struct smu_fan_control, ctrl)
53 static int smu_set_fan(int pwm, u8 id, u16 value)
57 DECLARE_COMPLETION(comp);
60 /* Fill SMU command structure */
61 cmd.cmd = SMU_CMD_FAN_COMMAND;
64 cmd.data_buf = cmd.reply_buf = buffer;
66 cmd.done = smu_done_complete;
69 /* Fill argument buffer */
70 memset(buffer, 0, 16);
71 buffer[0] = pwm ? 0x10 : 0x00;
72 buffer[1] = 0x01 << id;
73 *((u16 *)&buffer[2 + id * 2]) = value;
75 rc = smu_queue_cmd(&cmd);
78 wait_for_completion(&comp);
82 static void smu_fan_release(struct wf_control *ct)
84 struct smu_fan_control *fct = to_smu_fan(ct);
89 static int smu_fan_set(struct wf_control *ct, s32 value)
91 struct smu_fan_control *fct = to_smu_fan(ct);
99 return smu_set_fan(fct->fan_type, fct->reg, value);
102 static int smu_fan_get(struct wf_control *ct, s32 *value)
104 struct smu_fan_control *fct = to_smu_fan(ct);
105 *value = fct->value; /* todo: read from SMU */
109 static s32 smu_fan_min(struct wf_control *ct)
111 struct smu_fan_control *fct = to_smu_fan(ct);
115 static s32 smu_fan_max(struct wf_control *ct)
117 struct smu_fan_control *fct = to_smu_fan(ct);
121 static struct wf_control_ops smu_fan_ops = {
122 .set_value = smu_fan_set,
123 .get_value = smu_fan_get,
124 .get_min = smu_fan_min,
125 .get_max = smu_fan_max,
126 .release = smu_fan_release,
127 .owner = THIS_MODULE,
130 static struct smu_fan_control *smu_fan_create(struct device_node *node,
133 struct smu_fan_control *fct;
137 fct = kmalloc(sizeof(struct smu_fan_control), GFP_KERNEL);
140 fct->ctrl.ops = &smu_fan_ops;
141 l = (char *)get_property(node, "location", NULL);
145 fct->fan_type = pwm_fan;
146 fct->ctrl.type = pwm_fan ? WF_CONTROL_PWM_FAN : WF_CONTROL_RPM_FAN;
148 /* We use the name & location here the same way we do for SMU sensors,
149 * see the comment in windfarm_smu_sensors.c. The locations are a bit
150 * less consistent here between the iMac and the desktop models, but
151 * that is good enough for our needs for now at least.
153 * One problem though is that Apple seem to be inconsistent with case
154 * and the kernel doesn't have strcasecmp =P
157 fct->ctrl.name = NULL;
159 /* Names used on desktop models */
160 if (!strcmp(l, "Rear Fan 0") || !strcmp(l, "Rear Fan") ||
161 !strcmp(l, "Rear fan 0") || !strcmp(l, "Rear fan"))
162 fct->ctrl.name = "cpu-rear-fan-0";
163 else if (!strcmp(l, "Rear Fan 1") || !strcmp(l, "Rear fan 1"))
164 fct->ctrl.name = "cpu-rear-fan-1";
165 else if (!strcmp(l, "Front Fan 0") || !strcmp(l, "Front Fan") ||
166 !strcmp(l, "Front fan 0") || !strcmp(l, "Front fan"))
167 fct->ctrl.name = "cpu-front-fan-0";
168 else if (!strcmp(l, "Front Fan 1") || !strcmp(l, "Front fan 1"))
169 fct->ctrl.name = "cpu-front-fan-1";
170 else if (!strcmp(l, "Slots Fan") || !strcmp(l, "Slots fan"))
171 fct->ctrl.name = "slots-fan";
172 else if (!strcmp(l, "Drive Bay") || !strcmp(l, "Drive bay"))
173 fct->ctrl.name = "drive-bay-fan";
175 /* Names used on iMac models */
176 if (!strcmp(l, "System Fan") || !strcmp(l, "System fan"))
177 fct->ctrl.name = "system-fan";
178 else if (!strcmp(l, "CPU Fan") || !strcmp(l, "CPU fan"))
179 fct->ctrl.name = "cpu-fan";
180 else if (!strcmp(l, "Hard Drive") || !strcmp(l, "Hard drive"))
181 fct->ctrl.name = "drive-bay-fan";
183 /* Unrecognized fan, bail out */
184 if (fct->ctrl.name == NULL)
187 /* Get min & max values*/
188 v = (s32 *)get_property(node, "min-value", NULL);
192 v = (s32 *)get_property(node, "max-value", NULL);
197 /* Get "reg" value */
198 reg = (u32 *)get_property(node, "reg", NULL);
203 if (wf_register_control(&fct->ctrl))
213 static int __init smu_controls_init(void)
215 struct device_node *smu, *fans, *fan;
220 smu = of_find_node_by_type(NULL, "smu");
224 /* Look for RPM fans */
225 for (fans = NULL; (fans = of_get_next_child(smu, fans)) != NULL;)
226 if (!strcmp(fans->name, "rpm-fans"))
229 fans && (fan = of_get_next_child(fans, fan)) != NULL;) {
230 struct smu_fan_control *fct;
232 fct = smu_fan_create(fan, 0);
234 printk(KERN_WARNING "windfarm: Failed to create SMU "
235 "RPM fan %s\n", fan->name);
238 list_add(&fct->link, &smu_fans);
243 /* Look for PWM fans */
244 for (fans = NULL; (fans = of_get_next_child(smu, fans)) != NULL;)
245 if (!strcmp(fans->name, "pwm-fans"))
248 fans && (fan = of_get_next_child(fans, fan)) != NULL;) {
249 struct smu_fan_control *fct;
251 fct = smu_fan_create(fan, 1);
253 printk(KERN_WARNING "windfarm: Failed to create SMU "
254 "PWM fan %s\n", fan->name);
257 list_add(&fct->link, &smu_fans);
265 static void __exit smu_controls_exit(void)
267 struct smu_fan_control *fct;
269 while (!list_empty(&smu_fans)) {
270 fct = list_entry(smu_fans.next, struct smu_fan_control, link);
271 list_del(&fct->link);
272 wf_unregister_control(&fct->ctrl);
277 module_init(smu_controls_init);
278 module_exit(smu_controls_exit);
280 MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
281 MODULE_DESCRIPTION("SMU control objects for PowerMacs thermal control");
282 MODULE_LICENSE("GPL");