summaryrefslogtreecommitdiffstats
path: root/drivers/media/video/s5p-tv/sdo_drv.c
blob: 4dddd6bd635be25a2a4412c4bfa35215267f9b68 (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
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
/*
 * Samsung Standard Definition Output (SDO) driver
 *
 * Copyright (c) 2010-2011 Samsung Electronics Co., Ltd.
 *
 * Tomasz Stanislawski, <t.stanislaws@samsung.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published
 * by the Free Software Foundiation. either version 2 of the License,
 * or (at your option) any later version
 */

#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>

#include <media/v4l2-subdev.h>

#include "regs-sdo.h"

MODULE_AUTHOR("Tomasz Stanislawski, <t.stanislaws@samsung.com>");
MODULE_DESCRIPTION("Samsung Standard Definition Output (SDO)");
MODULE_LICENSE("GPL");

#define SDO_DEFAULT_STD	V4L2_STD_PAL

struct sdo_format {
	v4l2_std_id id;
	/* all modes are 720 pixels wide */
	unsigned int height;
	unsigned int cookie;
};

struct sdo_device {
	/** pointer to device parent */
	struct device *dev;
	/** base address of SDO registers */
	void __iomem *regs;
	/** SDO interrupt */
	unsigned int irq;
	/** DAC source clock */
	struct clk *sclk_dac;
	/** DAC clock */
	struct clk *dac;
	/** DAC physical interface */
	struct clk *dacphy;
	/** clock for control of VPLL */
	struct clk *fout_vpll;
	/** regulator for SDO IP power */
	struct regulator *vdac;
	/** regulator for SDO plug detection */
	struct regulator *vdet;
	/** subdev used as device interface */
	struct v4l2_subdev sd;
	/** current format */
	const struct sdo_format *fmt;
};

static inline struct sdo_device *sd_to_sdev(struct v4l2_subdev *sd)
{
	return container_of(sd, struct sdo_device, sd);
}

static inline
void sdo_write_mask(struct sdo_device *sdev, u32 reg_id, u32 value, u32 mask)
{
	u32 old = readl(sdev->regs + reg_id);
	value = (value & mask) | (old & ~mask);
	writel(value, sdev->regs + reg_id);
}

static inline
void sdo_write(struct sdo_device *sdev, u32 reg_id, u32 value)
{
	writel(value, sdev->regs + reg_id);
}

static inline
u32 sdo_read(struct sdo_device *sdev, u32 reg_id)
{
	return readl(sdev->regs + reg_id);
}

static irqreturn_t sdo_irq_handler(int irq, void *dev_data)
{
	struct sdo_device *sdev = dev_data;

	/* clear interrupt */
	sdo_write_mask(sdev, SDO_IRQ, ~0, SDO_VSYNC_IRQ_PEND);
	return IRQ_HANDLED;
}

static void sdo_reg_debug(struct sdo_device *sdev)
{
#define DBGREG(reg_id) \
	dev_info(sdev->dev, #reg_id " = %08x\n", \
		sdo_read(sdev, reg_id))

	DBGREG(SDO_CLKCON);
	DBGREG(SDO_CONFIG);
	DBGREG(SDO_VBI);
	DBGREG(SDO_DAC);
	DBGREG(SDO_IRQ);
	DBGREG(SDO_IRQMASK);
	DBGREG(SDO_VERSION);
}

static const struct sdo_format sdo_format[] = {
	{ V4L2_STD_PAL_N,	.height = 576, .cookie = SDO_PAL_N },
	{ V4L2_STD_PAL_Nc,	.height = 576, .cookie = SDO_PAL_NC },
	{ V4L2_STD_PAL_M,	.height = 480, .cookie = SDO_PAL_M },
	{ V4L2_STD_PAL_60,	.height = 480, .cookie = SDO_PAL_60 },
	{ V4L2_STD_NTSC_443,	.height = 480, .cookie = SDO_NTSC_443 },
	{ V4L2_STD_PAL,		.height = 576, .cookie = SDO_PAL_BGHID },
	{ V4L2_STD_NTSC_M,	.height = 480, .cookie = SDO_NTSC_M },
};

static const struct sdo_format *sdo_find_format(v4l2_std_id id)
{
	int i;
	for (i = 0; i < ARRAY_SIZE(sdo_format); ++i)
		if (sdo_format[i].id & id)
			return &sdo_format[i];
	return NULL;
}

static int sdo_g_tvnorms_output(struct v4l2_subdev *sd, v4l2_std_id *std)
{
	*std = V4L2_STD_NTSC_M | V4L2_STD_PAL_M | V4L2_STD_PAL |
		V4L2_STD_PAL_N | V4L2_STD_PAL_Nc |
		V4L2_STD_NTSC_443 | V4L2_STD_PAL_60;
	return 0;
}

static int sdo_s_std_output(struct v4l2_subdev *sd, v4l2_std_id std)
{
	struct sdo_device *sdev = sd_to_sdev(sd);
	const struct sdo_format *fmt;
	fmt = sdo_find_format(std);
	if (fmt == NULL)
		return -EINVAL;
	sdev->fmt = fmt;
	return 0;
}

static int sdo_g_std_output(struct v4l2_subdev *sd, v4l2_std_id *std)
{
	*std = sd_to_sdev(sd)->fmt->id;
	return 0;
}

static int sdo_g_mbus_fmt(struct v4l2_subdev *sd,
	struct v4l2_mbus_framefmt *fmt)
{
	struct sdo_device *sdev = sd_to_sdev(sd);

	if (!sdev->fmt)
		return -ENXIO;
	/* all modes are 720 pixels wide */
	fmt->width = 720;
	fmt->height = sdev->fmt->height;
	fmt->code = V4L2_MBUS_FMT_FIXED;
	fmt->field = V4L2_FIELD_INTERLACED;
	return 0;
}

static int sdo_s_power(struct v4l2_subdev *sd, int on)
{
	struct sdo_device *sdev = sd_to_sdev(sd);
	struct device *dev = sdev->dev;
	int ret;

	dev_info(dev, "sdo_s_power(%d)\n", on);

	if (on)
		ret = pm_runtime_get_sync(dev);
	else
		ret = pm_runtime_put_sync(dev);

	/* only values < 0 indicate errors */
	return IS_ERR_VALUE(ret) ? ret : 0;
}

static int sdo_streamon(struct sdo_device *sdev)
{
	/* set proper clock for Timing Generator */
	clk_set_rate(sdev->fout_vpll, 54000000);
	dev_info(sdev->dev, "fout_vpll.rate = %lu\n",
	clk_get_rate(sdev->fout_vpll));
	/* enable clock in SDO */
	sdo_write_mask(sdev, SDO_CLKCON, ~0, SDO_TVOUT_CLOCK_ON);
	clk_enable(sdev->dacphy);
	/* enable DAC */
	sdo_write_mask(sdev, SDO_DAC, ~0, SDO_POWER_ON_DAC);
	sdo_reg_debug(sdev);
	return 0;
}

static int sdo_streamoff(struct sdo_device *sdev)
{
	int tries;

	sdo_write_mask(sdev, SDO_DAC, 0, SDO_POWER_ON_DAC);
	clk_disable(sdev->dacphy);
	sdo_write_mask(sdev, SDO_CLKCON, 0, SDO_TVOUT_CLOCK_ON);
	for (tries = 100; tries; --tries) {
		if (sdo_read(sdev, SDO_CLKCON) & SDO_TVOUT_CLOCK_READY)
			break;
		mdelay(1);
	}
	if (tries == 0)
		dev_err(sdev->dev, "failed to stop streaming\n");
	return tries ? 0 : -EIO;
}

static int sdo_s_stream(struct v4l2_subdev *sd, int on)
{
	struct sdo_device *sdev = sd_to_sdev(sd);
	return on ? sdo_streamon(sdev) : sdo_streamoff(sdev);
}

static const struct v4l2_subdev_core_ops sdo_sd_core_ops = {
	.s_power = sdo_s_power,
};

static const struct v4l2_subdev_video_ops sdo_sd_video_ops = {
	.s_std_output = sdo_s_std_output,
	.g_std_output = sdo_g_std_output,
	.g_tvnorms_output = sdo_g_tvnorms_output,
	.g_mbus_fmt = sdo_g_mbus_fmt,
	.s_stream = sdo_s_stream,
};

static const struct v4l2_subdev_ops sdo_sd_ops = {
	.core = &sdo_sd_core_ops,
	.video = &sdo_sd_video_ops,
};

static int sdo_runtime_suspend(struct device *dev)
{
	struct v4l2_subdev *sd = dev_get_drvdata(dev);
	struct sdo_device *sdev = sd_to_sdev(sd);

	dev_info(dev, "suspend\n");
	regulator_disable(sdev->vdet);
	regulator_disable(sdev->vdac);
	clk_disable(sdev->sclk_dac);
	return 0;
}

static int sdo_runtime_resume(struct device *dev)
{
	struct v4l2_subdev *sd = dev_get_drvdata(dev);
	struct sdo_device *sdev = sd_to_sdev(sd);

	dev_info(dev, "resume\n");
	clk_enable(sdev->sclk_dac);
	regulator_enable(sdev->vdac);
	regulator_enable(sdev->vdet);

	/* software reset */
	sdo_write_mask(sdev, SDO_CLKCON, ~0, SDO_TVOUT_SW_RESET);
	mdelay(10);
	sdo_write_mask(sdev, SDO_CLKCON, 0, SDO_TVOUT_SW_RESET);

	/* setting TV mode */
	sdo_write_mask(sdev, SDO_CONFIG, sdev->fmt->cookie, SDO_STANDARD_MASK);
	/* XXX: forcing interlaced mode using undocumented bit */
	sdo_write_mask(sdev, SDO_CONFIG, 0, SDO_PROGRESSIVE);
	/* turn all VBI off */
	sdo_write_mask(sdev, SDO_VBI, 0, SDO_CVBS_WSS_INS |
		SDO_CVBS_CLOSED_CAPTION_MASK);
	/* turn all post processing off */
	sdo_write_mask(sdev, SDO_CCCON, ~0, SDO_COMPENSATION_BHS_ADJ_OFF |
		SDO_COMPENSATION_CVBS_COMP_OFF);
	sdo_reg_debug(sdev);
	return 0;
}

static const struct dev_pm_ops sdo_pm_ops = {
	.runtime_suspend = sdo_runtime_suspend,
	.runtime_resume	 = sdo_runtime_resume,
};

static int __devinit sdo_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct sdo_device *sdev;
	struct resource *res;
	int ret = 0;
	struct clk *sclk_vpll;

	dev_info(dev, "probe start\n");
	sdev = kzalloc(sizeof *sdev, GFP_KERNEL);
	if (!sdev) {
		dev_err(dev, "not enough memory.\n");
		ret = -ENOMEM;
		goto fail;
	}
	sdev->dev = dev;

	/* mapping registers */
	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (res == NULL) {
		dev_err(dev, "get memory resource failed.\n");
		ret = -ENXIO;
		goto fail_sdev;
	}

	sdev->regs = ioremap(res->start, resource_size(res));
	if (sdev->regs == NULL) {
		dev_err(dev, "register mapping failed.\n");
		ret = -ENXIO;
		goto fail_sdev;
	}

	/* acquiring interrupt */
	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	if (res == NULL) {
		dev_err(dev, "get interrupt resource failed.\n");
		ret = -ENXIO;
		goto fail_regs;
	}
	ret = request_irq(res->start, sdo_irq_handler, 0, "s5p-sdo", sdev);
	if (ret) {
		dev_err(dev, "request interrupt failed.\n");
		goto fail_regs;
	}
	sdev->irq = res->start;

	/* acquire clocks */
	sdev->sclk_dac = clk_get(dev, "sclk_dac");
	if (IS_ERR_OR_NULL(sdev->sclk_dac)) {
		dev_err(dev, "failed to get clock 'sclk_dac'\n");
		ret = -ENXIO;
		goto fail_irq;
	}
	sdev->dac = clk_get(dev, "dac");
	if (IS_ERR_OR_NULL(sdev->dac)) {
		dev_err(dev, "failed to get clock 'dac'\n");
		ret = -ENXIO;
		goto fail_sclk_dac;
	}
	sdev->dacphy = clk_get(dev, "dacphy");
	if (IS_ERR_OR_NULL(sdev->dacphy)) {
		dev_err(dev, "failed to get clock 'dacphy'\n");
		ret = -ENXIO;
		goto fail_dac;
	}
	sclk_vpll = clk_get(dev, "sclk_vpll");
	if (IS_ERR_OR_NULL(sclk_vpll)) {
		dev_err(dev, "failed to get clock 'sclk_vpll'\n");
		ret = -ENXIO;
		goto fail_dacphy;
	}
	clk_set_parent(sdev->sclk_dac, sclk_vpll);
	clk_put(sclk_vpll);
	sdev->fout_vpll = clk_get(dev, "fout_vpll");
	if (IS_ERR_OR_NULL(sdev->fout_vpll)) {
		dev_err(dev, "failed to get clock 'fout_vpll'\n");
		goto fail_dacphy;
	}
	dev_info(dev, "fout_vpll.rate = %lu\n", clk_get_rate(sclk_vpll));

	/* acquire regulator */
	sdev->vdac = regulator_get(dev, "vdd33a_dac");
	if (IS_ERR_OR_NULL(sdev->vdac)) {
		dev_err(dev, "failed to get regulator 'vdac'\n");
		goto fail_fout_vpll;
	}
	sdev->vdet = regulator_get(dev, "vdet");
	if (IS_ERR_OR_NULL(sdev->vdet)) {
		dev_err(dev, "failed to get regulator 'vdet'\n");
		goto fail_vdac;
	}

	/* enable gate for dac clock, because mixer uses it */
	clk_enable(sdev->dac);

	/* configure power management */
	pm_runtime_enable(dev);

	/* configuration of interface subdevice */
	v4l2_subdev_init(&sdev->sd, &sdo_sd_ops);
	sdev->sd.owner = THIS_MODULE;
	strlcpy(sdev->sd.name, "s5p-sdo", sizeof sdev->sd.name);

	/* set default format */
	sdev->fmt = sdo_find_format(SDO_DEFAULT_STD);
	BUG_ON(sdev->fmt == NULL);

	/* keeping subdev in device's private for use by other drivers */
	dev_set_drvdata(dev, &sdev->sd);

	dev_info(dev, "probe succeeded\n");
	return 0;

fail_vdac:
	regulator_put(sdev->vdac);
fail_fout_vpll:
	clk_put(sdev->fout_vpll);
fail_dacphy:
	clk_put(sdev->dacphy);
fail_dac:
	clk_put(sdev->dac);
fail_sclk_dac:
	clk_put(sdev->sclk_dac);
fail_irq:
	free_irq(sdev->irq, sdev);
fail_regs:
	iounmap(sdev->regs);
fail_sdev:
	kfree(sdev);
fail:
	dev_info(dev, "probe failed\n");
	return ret;
}

static int __devexit sdo_remove(struct platform_device *pdev)
{
	struct v4l2_subdev *sd = dev_get_drvdata(&pdev->dev);
	struct sdo_device *sdev = sd_to_sdev(sd);

	pm_runtime_disable(&pdev->dev);
	clk_disable(sdev->dac);
	regulator_put(sdev->vdet);
	regulator_put(sdev->vdac);
	clk_put(sdev->fout_vpll);
	clk_put(sdev->dacphy);
	clk_put(sdev->dac);
	clk_put(sdev->sclk_dac);
	free_irq(sdev->irq, sdev);
	iounmap(sdev->regs);
	kfree(sdev);

	dev_info(&pdev->dev, "remove successful\n");
	return 0;
}

static struct platform_driver sdo_driver __refdata = {
	.probe = sdo_probe,
	.remove = __devexit_p(sdo_remove),
	.driver = {
		.name = "s5p-sdo",
		.owner = THIS_MODULE,
		.pm = &sdo_pm_ops,
	}
};

static int __init sdo_init(void)
{
	int ret;
	static const char banner[] __initdata = KERN_INFO \
		"Samsung Standard Definition Output (SDO) driver, "
		"(c) 2010-2011 Samsung Electronics Co., Ltd.\n";
	printk(banner);

	ret = platform_driver_register(&sdo_driver);
	if (ret)
		printk(KERN_ERR "SDO platform driver register failed\n");

	return ret;
}
module_init(sdo_init);

static void __exit sdo_exit(void)
{
	platform_driver_unregister(&sdo_driver);
}
module_exit(sdo_exit);
OpenPOWER on IntegriCloud