aboutsummaryrefslogtreecommitdiff
path: root/sound/aoa/soundbus/i2sbus/i2sbus-core.c
blob: 4f0c17eddece7ca7a77ac415eb9140c3cc3565b6 (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
/*
 * i2sbus driver
 *
 * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
 *
 * GPL v2, can be found in COPYING.
 */

#include <linux/module.h>
#include <asm/macio.h>
#include <asm/dbdma.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <sound/driver.h>
#include <sound/core.h>
#include <linux/dma-mapping.h>
#include "../soundbus.h"
#include "i2sbus.h"

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
MODULE_DESCRIPTION("Apple Soundbus: I2S support");
/* for auto-loading, declare that we handle this weird
 * string that macio puts into the relevant device */
MODULE_ALIAS("of:Ni2sTi2sC");

static struct of_device_id i2sbus_match[] = {
	{ .name = "i2s" },
	{ }
};

static int alloc_dbdma_descriptor_ring(struct i2sbus_dev *i2sdev,
				       struct dbdma_command_mem *r,
				       int numcmds)
{
	/* one more for rounding */
	r->size = (numcmds+1) * sizeof(struct dbdma_cmd);
	/* We use the PCI APIs for now until the generic one gets fixed
	 * enough or until we get some macio-specific versions
	 */
	r->space = dma_alloc_coherent(
			&macio_get_pci_dev(i2sdev->macio)->dev,
			r->size,
			&r->bus_addr,
			GFP_KERNEL);

	if (!r->space) return -ENOMEM;

	memset(r->space, 0, r->size);
	r->cmds = (void*)DBDMA_ALIGN(r->space);
	r->bus_cmd_start = r->bus_addr +
			   (dma_addr_t)((char*)r->cmds - (char*)r->space);

	return 0;
}

static void free_dbdma_descriptor_ring(struct i2sbus_dev *i2sdev,
				       struct dbdma_command_mem *r)
{
	if (!r->space) return;
	
	dma_free_coherent(&macio_get_pci_dev(i2sdev->macio)->dev,
			    r->size, r->space, r->bus_addr);
}

static void i2sbus_release_dev(struct device *dev)
{
	struct i2sbus_dev *i2sdev;
	int i;

	i2sdev = container_of(dev, struct i2sbus_dev, sound.ofdev.dev);

 	if (i2sdev->intfregs) iounmap(i2sdev->intfregs);
 	if (i2sdev->out.dbdma) iounmap(i2sdev->out.dbdma);
 	if (i2sdev->in.dbdma) iounmap(i2sdev->in.dbdma);
	for (i=0;i<3;i++)
		if (i2sdev->allocated_resource[i])
			release_and_free_resource(i2sdev->allocated_resource[i]);
	free_dbdma_descriptor_ring(i2sdev, &i2sdev->out.dbdma_ring);
	free_dbdma_descriptor_ring(i2sdev, &i2sdev->in.dbdma_ring);
	for (i=0;i<3;i++)
		free_irq(i2sdev->interrupts[i], i2sdev);
	i2sbus_control_remove_dev(i2sdev->control, i2sdev);
	mutex_destroy(&i2sdev->lock);
	kfree(i2sdev);
}

static irqreturn_t i2sbus_bus_intr(int irq, void *devid, struct pt_regs *regs)
{
	struct i2sbus_dev *dev = devid;
	u32 intreg;

	spin_lock(&dev->low_lock);
	intreg = in_le32(&dev->intfregs->intr_ctl);

	/* acknowledge interrupt reasons */
	out_le32(&dev->intfregs->intr_ctl, intreg);

	spin_unlock(&dev->low_lock);

	return IRQ_HANDLED;
}

static int force;
module_param(force, int, 0444);
MODULE_PARM_DESC(force, "Force loading i2sbus even when"
			" no layout-id property is present");

/* FIXME: look at device node refcounting */
static int i2sbus_add_dev(struct macio_dev *macio,
			  struct i2sbus_control *control,
			  struct device_node *np)
{
	struct i2sbus_dev *dev;
	struct device_node *child = NULL, *sound = NULL;
	int i;
	static const char *rnames[] = { "i2sbus: %s (control)",
					"i2sbus: %s (tx)",
					"i2sbus: %s (rx)" };
	static irqreturn_t (*ints[])(int irq, void *devid,
				     struct pt_regs *regs) = {
		i2sbus_bus_intr,
		i2sbus_tx_intr,
		i2sbus_rx_intr
	};

	if (strlen(np->name) != 5)
		return 0;
	if (strncmp(np->name, "i2s-", 4))
		return 0;

	dev = kzalloc(sizeof(struct i2sbus_dev), GFP_KERNEL);
	if (!dev)
		return 0;

	i = 0;
	while ((child = of_get_next_child(np, child))) {
		if (strcmp(child->name, "sound") == 0) {
			i++;
			sound = child;
		}
	}
	if (i == 1) {
		u32 *layout_id;
		layout_id = (u32*) get_property(sound, "layout-id", NULL);
		if (layout_id) {
			snprintf(dev->sound.modalias, 32,
				 "sound-layout-%d", *layout_id);
			force = 1;
		}
	}
	/* for the time being, until we can handle non-layout-id
	 * things in some fabric, refuse to attach if there is no
	 * layout-id property or we haven't been forced to attach.
	 * When there are two i2s busses and only one has a layout-id,
	 * then this depends on the order, but that isn't important
	 * either as the second one in that case is just a modem. */
	if (!force) {
		kfree(dev);
		return -ENODEV;
	}

	mutex_init(&dev->lock);
	spin_lock_init(&dev->low_lock);
	dev->sound.ofdev.node = np;
	dev->sound.ofdev.dma_mask = macio->ofdev.dma_mask;
	dev->sound.ofdev.dev.dma_mask = &dev->sound.ofdev.dma_mask;
	dev->sound.ofdev.dev.parent = &macio->ofdev.dev;
	dev->sound.ofdev.dev.release = i2sbus_release_dev;
	dev->sound.attach_codec = i2sbus_attach_codec;
	dev->sound.detach_codec = i2sbus_detach_codec;
	dev->sound.pcmid = -1;
	dev->macio = macio;
	dev->control = control;
	dev->bus_number = np->name[4] - 'a';
	INIT_LIST_HEAD(&dev->sound.codec_list);

	for (i=0;i<3;i++) {
		dev->interrupts[i] = -1;
		snprintf(dev->rnames[i], sizeof(dev->rnames[i]), rnames[i], np->name);
	}
	for (i=0;i<3;i++) {
		int irq = irq_of_parse_and_map(np, i);
		if (request_irq(irq, ints[i], 0, dev->rnames[i], dev))
			goto err;
		dev->interrupts[i] = irq;
	}

	for (i=0;i<3;i++) {
		if (of_address_to_resource(np, i, &dev->resources[i]))
			goto err;
		/* if only we could use our resource dev->resources[i]...
		 * but request_resource doesn't know about parents and
		 * contained resources... */
		dev->allocated_resource[i] = 
			request_mem_region(dev->resources[i].start,
					   dev->resources[i].end -
					   dev->resources[i].start + 1,
					   dev->rnames[i]);
		if (!dev->allocated_resource[i]) {
			printk(KERN_ERR "i2sbus: failed to claim resource %d!\n", i);
			goto err;
		}
	}
	/* should do sanity checking here about length of them */
	dev->intfregs = ioremap(dev->resources[0].start,
				dev->resources[0].end-dev->resources[0].start+1);
	dev->out.dbdma = ioremap(dev->resources[1].start,
			 	 dev->resources[1].end-dev->resources[1].start+1);
	dev->in.dbdma = ioremap(dev->resources[2].start,
				dev->resources[2].end-dev->resources[2].start+1);
	if (!dev->intfregs || !dev->out.dbdma || !dev->in.dbdma)
		goto err;

	if (alloc_dbdma_descriptor_ring(dev, &dev->out.dbdma_ring,
					MAX_DBDMA_COMMANDS))
		goto err;
	if (alloc_dbdma_descriptor_ring(dev, &dev->in.dbdma_ring,
					MAX_DBDMA_COMMANDS))
		goto err;

	if (i2sbus_control_add_dev(dev->control, dev)) {
		printk(KERN_ERR "i2sbus: control layer didn't like bus\n");
		goto err;
	}

	if (soundbus_add_one(&dev->sound)) {
		printk(KERN_DEBUG "i2sbus: device registration error!\n");
		goto err;
	}

	/* enable this cell */
	i2sbus_control_cell(dev->control, dev, 1);
	i2sbus_control_enable(dev->control, dev);
	i2sbus_control_clock(dev->control, dev, 1);

	return 1;
 err:
	for (i=0;i<3;i++)
		if (dev->interrupts[i] != -1)
			free_irq(dev->interrupts[i], dev);
	free_dbdma_descriptor_ring(dev, &dev->out.dbdma_ring);
	free_dbdma_descriptor_ring(dev, &dev->in.dbdma_ring);
	if (dev->intfregs) iounmap(dev->intfregs);
	if (dev->out.dbdma) iounmap(dev->out.dbdma);
	if (dev->in.dbdma) iounmap(dev->in.dbdma);
	for (i=0;i<3;i++)
		if (dev->allocated_resource[i])
			release_and_free_resource(dev->allocated_resource[i]);
	mutex_destroy(&dev->lock);
	kfree(dev);
	return 0;
}

static int i2sbus_probe(struct macio_dev* dev, const struct of_device_id *match)
{
	struct device_node *np = NULL;
	int got = 0, err;
	struct i2sbus_control *control = NULL;

	err = i2sbus_control_init(dev, &control);
	if (err)
		return err;
	if (!control) {
		printk(KERN_ERR "i2sbus_control_init API breakage\n");
		return -ENODEV;
	}

	while ((np = of_get_next_child(dev->ofdev.node, np))) {
		if (device_is_compatible(np, "i2sbus") ||
		    device_is_compatible(np, "i2s-modem")) {
			got += i2sbus_add_dev(dev, control, np);
		}
	}

	if (!got) {
		/* found none, clean up */
		i2sbus_control_destroy(control);
		return -ENODEV;
	}

	dev->ofdev.dev.driver_data = control;

	return 0;
}

static int i2sbus_remove(struct macio_dev* dev)
{
	struct i2sbus_control *control = dev->ofdev.dev.driver_data;
	struct i2sbus_dev *i2sdev, *tmp;

	list_for_each_entry_safe(i2sdev, tmp, &control->list, item)
		soundbus_remove_one(&i2sdev->sound);

	return 0;
}

#ifdef CONFIG_PM
static int i2sbus_suspend(struct macio_dev* dev, pm_message_t state)
{
	struct i2sbus_control *control = dev->ofdev.dev.driver_data;
	struct codec_info_item *cii;
	struct i2sbus_dev* i2sdev;
	int err, ret = 0;

	list_for_each_entry(i2sdev, &control->list, item) {
		/* Notify Alsa */
		if (i2sdev->sound.pcm) {
			/* Suspend PCM streams */
			snd_pcm_suspend_all(i2sdev->sound.pcm);
			/* Probably useless as we handle
			 * power transitions ourselves */
			snd_power_change_state(i2sdev->sound.pcm->card,
					       SNDRV_CTL_POWER_D3hot);
		}
		/* Notify codecs */
		list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
			err = 0;
			if (cii->codec->suspend)
				err = cii->codec->suspend(cii, state);
			if (err)
				ret = err;
		}
	}
	return ret;
}

static int i2sbus_resume(struct macio_dev* dev)
{
	struct i2sbus_control *control = dev->ofdev.dev.driver_data;
	struct codec_info_item *cii;
	struct i2sbus_dev* i2sdev;
	int err, ret = 0;

	list_for_each_entry(i2sdev, &control->list, item) {
		/* Notify codecs so they can re-initialize */
		list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
			err = 0;
			if (cii->codec->resume)
				err = cii->codec->resume(cii);
			if (err)
				ret = err;
		}
		/* Notify Alsa */
		if (i2sdev->sound.pcm) {
			/* Same comment as above, probably useless */
			snd_power_change_state(i2sdev->sound.pcm->card,
					       SNDRV_CTL_POWER_D0);
		}
	}

	return ret;
}
#endif /* CONFIG_PM */

static int i2sbus_shutdown(struct macio_dev* dev)
{
	return 0;
}

static struct macio_driver i2sbus_drv = {
	.name = "soundbus-i2s",
	.owner = THIS_MODULE,
	.match_table = i2sbus_match,
	.probe = i2sbus_probe,
	.remove = i2sbus_remove,
#ifdef CONFIG_PM
	.suspend = i2sbus_suspend,
	.resume = i2sbus_resume,
#endif
	.shutdown = i2sbus_shutdown,
};

static int __init soundbus_i2sbus_init(void)
{
	return macio_register_driver(&i2sbus_drv);
}

static void __exit soundbus_i2sbus_exit(void)
{
	macio_unregister_driver(&i2sbus_drv);
}

module_init(soundbus_i2sbus_init);
module_exit(soundbus_i2sbus_exit);