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-rw-r--r--drivers/macintosh/windfarm_smu_controls.c282
1 files changed, 282 insertions, 0 deletions
diff --git a/drivers/macintosh/windfarm_smu_controls.c b/drivers/macintosh/windfarm_smu_controls.c
new file mode 100644
index 000000000000..2c3158c81ff2
--- /dev/null
+++ b/drivers/macintosh/windfarm_smu_controls.c
@@ -0,0 +1,282 @@
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
40static LIST_HEAD(smu_fans);
41
42struct 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
52static 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 = &comp;
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
81static 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
88static 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
101static 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
108static 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
114static 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
120static 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
129static 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
212static 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
264static 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
276module_init(smu_controls_init);
277module_exit(smu_controls_exit);
278
279MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
280MODULE_DESCRIPTION("SMU control objects for PowerMacs thermal control");
281MODULE_LICENSE("GPL");
282
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-14 01:39:45 -0500