summaryrefslogtreecommitdiff
path: root/drivers/macintosh/windfarm_smu_controls.c
blob: e9957ad49a2af21c4f953daadce9021585a2429a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Windfarm PowerMac thermal control. SMU based controls
 *
 * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
 *                    <benh@kernel.crashing.org>
 */

#include <linux/types.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/wait.h>
#include <linux/completion.h>
#include <linux/of.h>

#include <asm/machdep.h>
#include <asm/io.h>
#include <asm/sections.h>
#include <asm/smu.h>

#include "windfarm.h"

#define VERSION "0.4"

#undef DEBUG

#ifdef DEBUG
#define DBG(args...)	printk(args)
#else
#define DBG(args...)	do { } while(0)
#endif

static int smu_supports_new_fans_ops = 1;

/*
 * SMU fans control object
 */

static LIST_HEAD(smu_fans);

struct smu_fan_control {
	struct list_head	link;
	int    			fan_type;	/* 0 = rpm, 1 = pwm */
	u32			reg;		/* index in SMU */
	s32			value;		/* current value */
	s32			min, max;	/* min/max values */
	struct wf_control	ctrl;
};
#define to_smu_fan(c) container_of(c, struct smu_fan_control, ctrl)

static int smu_set_fan(int pwm, u8 id, u16 value)
{
	struct smu_cmd cmd;
	u8 buffer[16];
	DECLARE_COMPLETION_ONSTACK(comp);
	int rc;

	/* Fill SMU command structure */
	cmd.cmd = SMU_CMD_FAN_COMMAND;

	/* The SMU has an "old" and a "new" way of setting the fan speed
	 * Unfortunately, I found no reliable way to know which one works
	 * on a given machine model. After some investigations it appears
	 * that MacOS X just tries the new one, and if it fails fallbacks
	 * to the old ones ... Ugh.
	 */
 retry:
	if (smu_supports_new_fans_ops) {
		buffer[0] = 0x30;
		buffer[1] = id;
		*((u16 *)(&buffer[2])) = value;
		cmd.data_len = 4;
	} else {
		if (id > 7)
			return -EINVAL;
		/* Fill argument buffer */
		memset(buffer, 0, 16);
		buffer[0] = pwm ? 0x10 : 0x00;
		buffer[1] = 0x01 << id;
		*((u16 *)&buffer[2 + id * 2]) = value;
		cmd.data_len = 14;
	}

	cmd.reply_len = 16;
	cmd.data_buf = cmd.reply_buf = buffer;
	cmd.status = 0;
	cmd.done = smu_done_complete;
	cmd.misc = &comp;

	rc = smu_queue_cmd(&cmd);
	if (rc)
		return rc;
	wait_for_completion(&comp);

	/* Handle fallback (see comment above) */
	if (cmd.status != 0 && smu_supports_new_fans_ops) {
		printk(KERN_WARNING "windfarm: SMU failed new fan command "
		       "falling back to old method\n");
		smu_supports_new_fans_ops = 0;
		goto retry;
	}

	return cmd.status;
}

static void smu_fan_release(struct wf_control *ct)
{
	struct smu_fan_control *fct = to_smu_fan(ct);

	kfree(fct);
}

static int smu_fan_set(struct wf_control *ct, s32 value)
{
	struct smu_fan_control *fct = to_smu_fan(ct);

	if (value < fct->min)
		value = fct->min;
	if (value > fct->max)
		value = fct->max;
	fct->value = value;

	return smu_set_fan(fct->fan_type, fct->reg, value);
}

static int smu_fan_get(struct wf_control *ct, s32 *value)
{
	struct smu_fan_control *fct = to_smu_fan(ct);
	*value = fct->value; /* todo: read from SMU */
	return 0;
}

static s32 smu_fan_min(struct wf_control *ct)
{
	struct smu_fan_control *fct = to_smu_fan(ct);
	return fct->min;
}

static s32 smu_fan_max(struct wf_control *ct)
{
	struct smu_fan_control *fct = to_smu_fan(ct);
	return fct->max;
}

static const struct wf_control_ops smu_fan_ops = {
	.set_value	= smu_fan_set,
	.get_value	= smu_fan_get,
	.get_min	= smu_fan_min,
	.get_max	= smu_fan_max,
	.release	= smu_fan_release,
	.owner		= THIS_MODULE,
};

static struct smu_fan_control *smu_fan_create(struct device_node *node,
					      int pwm_fan)
{
	struct smu_fan_control *fct;
	const s32 *v;
	const u32 *reg;
	const char *l;

	fct = kmalloc(sizeof(struct smu_fan_control), GFP_KERNEL);
	if (fct == NULL)
		return NULL;
	fct->ctrl.ops = &smu_fan_ops;
	l = of_get_property(node, "location", NULL);
	if (l == NULL)
		goto fail;

	fct->fan_type = pwm_fan;
	fct->ctrl.type = pwm_fan ? WF_CONTROL_PWM_FAN : WF_CONTROL_RPM_FAN;

	/* We use the name & location here the same way we do for SMU sensors,
	 * see the comment in windfarm_smu_sensors.c. The locations are a bit
	 * less consistent here between the iMac and the desktop models, but
	 * that is good enough for our needs for now at least.
	 *
	 * One problem though is that Apple seem to be inconsistent with case
	 * and the kernel doesn't have strcasecmp =P
	 */

	fct->ctrl.name = NULL;

	/* Names used on desktop models */
	if (!strcmp(l, "Rear Fan 0") || !strcmp(l, "Rear Fan") ||
	    !strcmp(l, "Rear fan 0") || !strcmp(l, "Rear fan") ||
	    !strcmp(l, "CPU A EXHAUST"))
		fct->ctrl.name = "cpu-rear-fan-0";
	else if (!strcmp(l, "Rear Fan 1") || !strcmp(l, "Rear fan 1") ||
		 !strcmp(l, "CPU B EXHAUST"))
		fct->ctrl.name = "cpu-rear-fan-1";
	else if (!strcmp(l, "Front Fan 0") || !strcmp(l, "Front Fan") ||
		 !strcmp(l, "Front fan 0") || !strcmp(l, "Front fan") ||
		 !strcmp(l, "CPU A INTAKE"))
		fct->ctrl.name = "cpu-front-fan-0";
	else if (!strcmp(l, "Front Fan 1") || !strcmp(l, "Front fan 1") ||
		 !strcmp(l, "CPU B INTAKE"))
		fct->ctrl.name = "cpu-front-fan-1";
	else if (!strcmp(l, "CPU A PUMP"))
		fct->ctrl.name = "cpu-pump-0";
	else if (!strcmp(l, "CPU B PUMP"))
		fct->ctrl.name = "cpu-pump-1";
	else if (!strcmp(l, "Slots Fan") || !strcmp(l, "Slots fan") ||
		 !strcmp(l, "EXPANSION SLOTS INTAKE"))
		fct->ctrl.name = "slots-fan";
	else if (!strcmp(l, "Drive Bay") || !strcmp(l, "Drive bay") ||
		 !strcmp(l, "DRIVE BAY A INTAKE"))
		fct->ctrl.name = "drive-bay-fan";
	else if (!strcmp(l, "BACKSIDE"))
		fct->ctrl.name = "backside-fan";

	/* Names used on iMac models */
	if (!strcmp(l, "System Fan") || !strcmp(l, "System fan"))
		fct->ctrl.name = "system-fan";
	else if (!strcmp(l, "CPU Fan") || !strcmp(l, "CPU fan"))
		fct->ctrl.name = "cpu-fan";
	else if (!strcmp(l, "Hard Drive") || !strcmp(l, "Hard drive"))
		fct->ctrl.name = "drive-bay-fan";
	else if (!strcmp(l, "HDD Fan")) /* seen on iMac G5 iSight */
		fct->ctrl.name = "hard-drive-fan";
	else if (!strcmp(l, "ODD Fan")) /* same */
		fct->ctrl.name = "optical-drive-fan";

	/* Unrecognized fan, bail out */
	if (fct->ctrl.name == NULL)
		goto fail;

	/* Get min & max values*/
	v = of_get_property(node, "min-value", NULL);
	if (v == NULL)
		goto fail;
	fct->min = *v;
	v = of_get_property(node, "max-value", NULL);
	if (v == NULL)
		goto fail;
	fct->max = *v;

	/* Get "reg" value */
	reg = of_get_property(node, "reg", NULL);
	if (reg == NULL)
		goto fail;
	fct->reg = *reg;

	if (wf_register_control(&fct->ctrl))
		goto fail;

	return fct;
 fail:
	kfree(fct);
	return NULL;
}


static int __init smu_controls_init(void)
{
	struct device_node *smu, *fans, *fan;

	if (!smu_present())
		return -ENODEV;

	smu = of_find_node_by_type(NULL, "smu");
	if (smu == NULL)
		return -ENODEV;

	/* Look for RPM fans */
	for (fans = NULL; (fans = of_get_next_child(smu, fans)) != NULL;)
		if (of_node_name_eq(fans, "rpm-fans") ||
		    of_device_is_compatible(fans, "smu-rpm-fans"))
			break;
	for (fan = NULL;
	     fans && (fan = of_get_next_child(fans, fan)) != NULL;) {
		struct smu_fan_control *fct;

		fct = smu_fan_create(fan, 0);
		if (fct == NULL) {
			printk(KERN_WARNING "windfarm: Failed to create SMU "
			       "RPM fan %pOFn\n", fan);
			continue;
		}
		list_add(&fct->link, &smu_fans);
	}
	of_node_put(fans);


	/* Look for PWM fans */
	for (fans = NULL; (fans = of_get_next_child(smu, fans)) != NULL;)
		if (of_node_name_eq(fans, "pwm-fans"))
			break;
	for (fan = NULL;
	     fans && (fan = of_get_next_child(fans, fan)) != NULL;) {
		struct smu_fan_control *fct;

		fct = smu_fan_create(fan, 1);
		if (fct == NULL) {
			printk(KERN_WARNING "windfarm: Failed to create SMU "
			       "PWM fan %pOFn\n", fan);
			continue;
		}
		list_add(&fct->link, &smu_fans);
	}
	of_node_put(fans);
	of_node_put(smu);

	return 0;
}

static void __exit smu_controls_exit(void)
{
	struct smu_fan_control *fct;

	while (!list_empty(&smu_fans)) {
		fct = list_entry(smu_fans.next, struct smu_fan_control, link);
		list_del(&fct->link);
		wf_unregister_control(&fct->ctrl);
	}
}


module_init(smu_controls_init);
module_exit(smu_controls_exit);

MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
MODULE_DESCRIPTION("SMU control objects for PowerMacs thermal control");
MODULE_LICENSE("GPL");