summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/nouveau/nouveau_gpio.c
blob: 82c19e82ff02e6914fd1b8923b87dd3fe44fe60e (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
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
/*
 * Copyright 2011 Red Hat Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors: Ben Skeggs
 */

#include "drmP.h"
#include "nouveau_drv.h"
#include "nouveau_i2c.h"
#include "nouveau_gpio.h"

static u8 *
dcb_gpio_table(struct drm_device *dev)
{
	u8 *dcb = dcb_table(dev);
	if (dcb) {
		if (dcb[0] >= 0x30 && dcb[1] >= 0x0c)
			return ROMPTR(dev, dcb[0x0a]);
		if (dcb[0] >= 0x22 && dcb[-1] >= 0x13)
			return ROMPTR(dev, dcb[-15]);
	}
	return NULL;
}

static u8 *
dcb_gpio_entry(struct drm_device *dev, int idx, int ent, u8 *version)
{
	u8 *table = dcb_gpio_table(dev);
	if (table) {
		*version = table[0];
		if (*version < 0x30 && ent < table[2])
			return table + 3 + (ent * table[1]);
		else if (ent < table[2])
			return table + table[1] + (ent * table[3]);
	}
	return NULL;
}

int
nouveau_gpio_drive(struct drm_device *dev, int idx, int line, int dir, int out)
{
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;

	return pgpio->drive ? pgpio->drive(dev, line, dir, out) : -ENODEV;
}

int
nouveau_gpio_sense(struct drm_device *dev, int idx, int line)
{
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;

	return pgpio->sense ? pgpio->sense(dev, line) : -ENODEV;
}

int
nouveau_gpio_find(struct drm_device *dev, int idx, u8 func, u8 line,
		  struct gpio_func *gpio)
{
	u8 *table, *entry, version;
	int i = -1;

	if (line == 0xff && func == 0xff)
		return -EINVAL;

	while ((entry = dcb_gpio_entry(dev, idx, ++i, &version))) {
		if (version < 0x40) {
			u16 data = ROM16(entry[0]);
			*gpio = (struct gpio_func) {
				.line = (data & 0x001f) >> 0,
				.func = (data & 0x07e0) >> 5,
				.log[0] = (data & 0x1800) >> 11,
				.log[1] = (data & 0x6000) >> 13,
			};
		} else
		if (version < 0x41) {
			*gpio = (struct gpio_func) {
				.line = entry[0] & 0x1f,
				.func = entry[1],
				.log[0] = (entry[3] & 0x18) >> 3,
				.log[1] = (entry[3] & 0x60) >> 5,
			};
		} else {
			*gpio = (struct gpio_func) {
				.line = entry[0] & 0x3f,
				.func = entry[1],
				.log[0] = (entry[4] & 0x30) >> 4,
				.log[1] = (entry[4] & 0xc0) >> 6,
			};
		}

		if ((line == 0xff || line == gpio->line) &&
		    (func == 0xff || func == gpio->func))
			return 0;
	}

	/* DCB 2.2, fixed TVDAC GPIO data */
	if ((table = dcb_table(dev)) && table[0] >= 0x22) {
		if (func == DCB_GPIO_TVDAC0) {
			*gpio = (struct gpio_func) {
				.func = DCB_GPIO_TVDAC0,
				.line = table[-4] >> 4,
				.log[0] = !!(table[-5] & 2),
				.log[1] =  !(table[-5] & 2),
			};
			return 0;
		}
	}

	/* Apple iMac G4 NV18 */
	if (nv_match_device(dev, 0x0189, 0x10de, 0x0010)) {
		if (func == DCB_GPIO_TVDAC0) {
			*gpio = (struct gpio_func) {
				.func = DCB_GPIO_TVDAC0,
				.line = 4,
				.log[0] = 0,
				.log[1] = 1,
			};
			return 0;
		}
	}

	return -EINVAL;
}

int
nouveau_gpio_set(struct drm_device *dev, int idx, u8 tag, u8 line, int state)
{
	struct gpio_func gpio;
	int ret;

	ret = nouveau_gpio_find(dev, idx, tag, line, &gpio);
	if (ret == 0) {
		int dir = !!(gpio.log[state] & 0x02);
		int out = !!(gpio.log[state] & 0x01);
		ret = nouveau_gpio_drive(dev, idx, gpio.line, dir, out);
	}

	return ret;
}

int
nouveau_gpio_get(struct drm_device *dev, int idx, u8 tag, u8 line)
{
	struct gpio_func gpio;
	int ret;

	ret = nouveau_gpio_find(dev, idx, tag, line, &gpio);
	if (ret == 0) {
		ret = nouveau_gpio_sense(dev, idx, gpio.line);
		if (ret >= 0)
			ret = (ret == (gpio.log[1] & 1));
	}

	return ret;
}

int
nouveau_gpio_irq(struct drm_device *dev, int idx, u8 tag, u8 line, bool on)
{
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;
	struct gpio_func gpio;
	int ret;

	ret = nouveau_gpio_find(dev, idx, tag, line, &gpio);
	if (ret == 0) {
		if (idx == 0 && pgpio->irq_enable)
			pgpio->irq_enable(dev, gpio.line, on);
		else
			ret = -ENODEV;
	}

	return ret;
}

struct gpio_isr {
	struct drm_device *dev;
	struct list_head head;
	struct work_struct work;
	int idx;
	struct gpio_func func;
	void (*handler)(void *, int);
	void *data;
	bool inhibit;
};

static void
nouveau_gpio_isr_bh(struct work_struct *work)
{
	struct gpio_isr *isr = container_of(work, struct gpio_isr, work);
	struct drm_device *dev = isr->dev;
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;
	unsigned long flags;
	int state;

	state = nouveau_gpio_get(dev, isr->idx, isr->func.func, isr->func.line);
	if (state >= 0)
		isr->handler(isr->data, state);

	spin_lock_irqsave(&pgpio->lock, flags);
	isr->inhibit = false;
	spin_unlock_irqrestore(&pgpio->lock, flags);
}

void
nouveau_gpio_isr(struct drm_device *dev, int idx, u32 line_mask)
{
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;
	struct gpio_isr *isr;

	if (idx != 0)
		return;

	spin_lock(&pgpio->lock);
	list_for_each_entry(isr, &pgpio->isr, head) {
		if (line_mask & (1 << isr->func.line)) {
			if (isr->inhibit)
				continue;
			isr->inhibit = true;
			schedule_work(&isr->work);
		}
	}
	spin_unlock(&pgpio->lock);
}

int
nouveau_gpio_isr_add(struct drm_device *dev, int idx, u8 tag, u8 line,
		     void (*handler)(void *, int), void *data)
{
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;
	struct gpio_isr *isr;
	unsigned long flags;
	int ret;

	isr = kzalloc(sizeof(*isr), GFP_KERNEL);
	if (!isr)
		return -ENOMEM;

	ret = nouveau_gpio_find(dev, idx, tag, line, &isr->func);
	if (ret) {
		kfree(isr);
		return ret;
	}

	INIT_WORK(&isr->work, nouveau_gpio_isr_bh);
	isr->dev = dev;
	isr->handler = handler;
	isr->data = data;
	isr->idx = idx;

	spin_lock_irqsave(&pgpio->lock, flags);
	list_add(&isr->head, &pgpio->isr);
	spin_unlock_irqrestore(&pgpio->lock, flags);
	return 0;
}

void
nouveau_gpio_isr_del(struct drm_device *dev, int idx, u8 tag, u8 line,
		     void (*handler)(void *, int), void *data)
{
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;
	struct gpio_isr *isr, *tmp;
	struct gpio_func func;
	unsigned long flags;
	LIST_HEAD(tofree);
	int ret;

	ret = nouveau_gpio_find(dev, idx, tag, line, &func);
	if (ret == 0) {
		spin_lock_irqsave(&pgpio->lock, flags);
		list_for_each_entry_safe(isr, tmp, &pgpio->isr, head) {
			if (memcmp(&isr->func, &func, sizeof(func)) ||
			    isr->idx != idx ||
			    isr->handler != handler || isr->data != data)
				continue;
			list_move(&isr->head, &tofree);
		}
		spin_unlock_irqrestore(&pgpio->lock, flags);

		list_for_each_entry_safe(isr, tmp, &tofree, head) {
			flush_work_sync(&isr->work);
			kfree(isr);
		}
	}
}

int
nouveau_gpio_create(struct drm_device *dev)
{
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;

	INIT_LIST_HEAD(&pgpio->isr);
	spin_lock_init(&pgpio->lock);

	return nouveau_gpio_init(dev);
}

void
nouveau_gpio_destroy(struct drm_device *dev)
{
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;

	nouveau_gpio_fini(dev);
	BUG_ON(!list_empty(&pgpio->isr));
}

int
nouveau_gpio_init(struct drm_device *dev)
{
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;
	int ret = 0;

	if (pgpio->init)
		ret = pgpio->init(dev);

	return ret;
}

void
nouveau_gpio_fini(struct drm_device *dev)
{
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;

	if (pgpio->fini)
		pgpio->fini(dev);
}

void
nouveau_gpio_reset(struct drm_device *dev)
{
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	u8 *entry, version;
	int ent = -1;

	while ((entry = dcb_gpio_entry(dev, 0, ++ent, &version))) {
		u8 func = 0xff, line, defs, unk0, unk1;
		if (version >= 0x41) {
			defs = !!(entry[0] & 0x80);
			line = entry[0] & 0x3f;
			func = entry[1];
			unk0 = entry[2];
			unk1 = entry[3] & 0x1f;
		} else
		if (version >= 0x40) {
			line = entry[0] & 0x1f;
			func = entry[1];
			defs = !!(entry[3] & 0x01);
			unk0 = !!(entry[3] & 0x02);
			unk1 = !!(entry[3] & 0x04);
		} else {
			break;
		}

		if (func == 0xff)
			continue;

		nouveau_gpio_func_set(dev, func, defs);

		if (dev_priv->card_type >= NV_D0) {
			nv_mask(dev, 0x00d610 + (line * 4), 0xff, unk0);
			if (unk1--)
				nv_mask(dev, 0x00d740 + (unk1 * 4), 0xff, line);
		} else
		if (dev_priv->card_type >= NV_50) {
			static const u32 regs[] = { 0xe100, 0xe28c };
			u32 val = (unk1 << 16) | unk0;
			u32 reg = regs[line >> 4]; line &= 0x0f;

			nv_mask(dev, reg, 0x00010001 << line, val << line);
		}
	}
}
OpenPOWER on IntegriCloud