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>
18 #include <asm/machdep.h>
20 #include <asm/system.h>
21 #include <asm/sections.h>
31 #define DBG(args...) printk(args)
33 #define DBG(args...) do { } while(0)
37 * SMU fans control object
40 static LIST_HEAD(smu_fans);
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;
50 #define to_smu_fan(c) container_of(c, struct smu_fan_control, ctrl)
52 static int smu_set_fan(int pwm, u8 id, u16 value)
56 DECLARE_COMPLETION(comp);
59 /* Fill SMU command structure */
60 cmd.cmd = SMU_CMD_FAN_COMMAND;
63 cmd.data_buf = cmd.reply_buf = buffer;
65 cmd.done = smu_done_complete;
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;
74 rc = smu_queue_cmd(&cmd);
77 wait_for_completion(&comp);
81 static void smu_fan_release(struct wf_control *ct)
83 struct smu_fan_control *fct = to_smu_fan(ct);
88 static int smu_fan_set(struct wf_control *ct, s32 value)
90 struct smu_fan_control *fct = to_smu_fan(ct);
98 return smu_set_fan(fct->fan_type, fct->reg, value);
101 static int smu_fan_get(struct wf_control *ct, s32 *value)
103 struct smu_fan_control *fct = to_smu_fan(ct);
104 *value = fct->value; /* todo: read from SMU */
108 static s32 smu_fan_min(struct wf_control *ct)
110 struct smu_fan_control *fct = to_smu_fan(ct);
114 static s32 smu_fan_max(struct wf_control *ct)
116 struct smu_fan_control *fct = to_smu_fan(ct);
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,
129 static struct smu_fan_control *smu_fan_create(struct device_node *node,
132 struct smu_fan_control *fct;
136 fct = kmalloc(sizeof(struct smu_fan_control), GFP_KERNEL);
139 fct->ctrl.ops = &smu_fan_ops;
140 l = (char *)get_property(node, "location", NULL);
144 fct->fan_type = pwm_fan;
145 fct->ctrl.type = pwm_fan ? WF_CONTROL_PWM_FAN : WF_CONTROL_RPM_FAN;
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.
152 * One problem though is that Apple seem to be inconsistent with case
153 * and the kernel doesn't have strcasecmp =P
156 fct->ctrl.name = NULL;
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";
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";
182 /* Unrecognized fan, bail out */
183 if (fct->ctrl.name == NULL)
186 /* Get min & max values*/
187 v = (s32 *)get_property(node, "min-value", NULL);
191 v = (s32 *)get_property(node, "max-value", NULL);
196 /* Get "reg" value */
197 reg = (u32 *)get_property(node, "reg", NULL);
202 if (wf_register_control(&fct->ctrl))
212 static int __init smu_controls_init(void)
214 struct device_node *smu, *fans, *fan;
219 smu = of_find_node_by_type(NULL, "smu");
223 /* Look for RPM fans */
224 for (fans = NULL; (fans = of_get_next_child(smu, fans)) != NULL;)
225 if (!strcmp(fans->name, "rpm-fans"))
228 fans && (fan = of_get_next_child(fans, fan)) != NULL;) {
229 struct smu_fan_control *fct;
231 fct = smu_fan_create(fan, 0);
233 printk(KERN_WARNING "windfarm: Failed to create SMU "
234 "RPM fan %s\n", fan->name);
237 list_add(&fct->link, &smu_fans);
242 /* Look for PWM fans */
243 for (fans = NULL; (fans = of_get_next_child(smu, fans)) != NULL;)
244 if (!strcmp(fans->name, "pwm-fans"))
247 fans && (fan = of_get_next_child(fans, fan)) != NULL;) {
248 struct smu_fan_control *fct;
250 fct = smu_fan_create(fan, 1);
252 printk(KERN_WARNING "windfarm: Failed to create SMU "
253 "PWM fan %s\n", fan->name);
256 list_add(&fct->link, &smu_fans);
264 static void __exit smu_controls_exit(void)
266 struct smu_fan_control *fct;
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);
276 module_init(smu_controls_init);
277 module_exit(smu_controls_exit);
279 MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
280 MODULE_DESCRIPTION("SMU control objects for PowerMacs thermal control");
281 MODULE_LICENSE("GPL");