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1/*
2 * Samsung Standard Definition Output (SDO) driver
3 *
4 * Copyright (c) 2010-2011 Samsung Electronics Co., Ltd.
5 *
6 * Tomasz Stanislawski, <t.stanislaws@samsung.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published
10 * by the Free Software Foundiation. either version 2 of the License,
11 * or (at your option) any later version
12 */
13
14#include <linux/clk.h>
15#include <linux/delay.h>
16#include <linux/kernel.h>
17#include <linux/module.h>
18#include <linux/interrupt.h>
19#include <linux/io.h>
20#include <linux/irq.h>
21#include <linux/platform_device.h>
22#include <linux/pm_runtime.h>
23#include <linux/regulator/consumer.h>
24#include <linux/slab.h>
25
26#include <media/v4l2-subdev.h>
27
28#include "regs-sdo.h"
29
30MODULE_AUTHOR("Tomasz Stanislawski, <t.stanislaws@samsung.com>");
31MODULE_DESCRIPTION("Samsung Standard Definition Output (SDO)");
32MODULE_LICENSE("GPL");
33
34#define SDO_DEFAULT_STD V4L2_STD_PAL
35
36struct sdo_format {
37 v4l2_std_id id;
38 /* all modes are 720 pixels wide */
39 unsigned int height;
40 unsigned int cookie;
41};
42
43struct sdo_device {
44 /** pointer to device parent */
45 struct device *dev;
46 /** base address of SDO registers */
47 void __iomem *regs;
48 /** SDO interrupt */
49 unsigned int irq;
50 /** DAC source clock */
51 struct clk *sclk_dac;
52 /** DAC clock */
53 struct clk *dac;
54 /** DAC physical interface */
55 struct clk *dacphy;
56 /** clock for control of VPLL */
57 struct clk *fout_vpll;
58 /** regulator for SDO IP power */
59 struct regulator *vdac;
60 /** regulator for SDO plug detection */
61 struct regulator *vdet;
62 /** subdev used as device interface */
63 struct v4l2_subdev sd;
64 /** current format */
65 const struct sdo_format *fmt;
66};
67
68static inline struct sdo_device *sd_to_sdev(struct v4l2_subdev *sd)
69{
70 return container_of(sd, struct sdo_device, sd);
71}
72
73static inline
74void sdo_write_mask(struct sdo_device *sdev, u32 reg_id, u32 value, u32 mask)
75{
76 u32 old = readl(sdev->regs + reg_id);
77 value = (value & mask) | (old & ~mask);
78 writel(value, sdev->regs + reg_id);
79}
80
81static inline
82void sdo_write(struct sdo_device *sdev, u32 reg_id, u32 value)
83{
84 writel(value, sdev->regs + reg_id);
85}
86
87static inline
88u32 sdo_read(struct sdo_device *sdev, u32 reg_id)
89{
90 return readl(sdev->regs + reg_id);
91}
92
93static irqreturn_t sdo_irq_handler(int irq, void *dev_data)
94{
95 struct sdo_device *sdev = dev_data;
96
97 /* clear interrupt */
98 sdo_write_mask(sdev, SDO_IRQ, ~0, SDO_VSYNC_IRQ_PEND);
99 return IRQ_HANDLED;
100}
101
102static void sdo_reg_debug(struct sdo_device *sdev)
103{
104#define DBGREG(reg_id) \
105 dev_info(sdev->dev, #reg_id " = %08x\n", \
106 sdo_read(sdev, reg_id))
107
108 DBGREG(SDO_CLKCON);
109 DBGREG(SDO_CONFIG);
110 DBGREG(SDO_VBI);
111 DBGREG(SDO_DAC);
112 DBGREG(SDO_IRQ);
113 DBGREG(SDO_IRQMASK);
114 DBGREG(SDO_VERSION);
115}
116
117static const struct sdo_format sdo_format[] = {
118 { V4L2_STD_PAL_N, .height = 576, .cookie = SDO_PAL_N },
119 { V4L2_STD_PAL_Nc, .height = 576, .cookie = SDO_PAL_NC },
120 { V4L2_STD_PAL_M, .height = 480, .cookie = SDO_PAL_M },
121 { V4L2_STD_PAL_60, .height = 480, .cookie = SDO_PAL_60 },
122 { V4L2_STD_NTSC_443, .height = 480, .cookie = SDO_NTSC_443 },
123 { V4L2_STD_PAL, .height = 576, .cookie = SDO_PAL_BGHID },
124 { V4L2_STD_NTSC_M, .height = 480, .cookie = SDO_NTSC_M },
125};
126
127static const struct sdo_format *sdo_find_format(v4l2_std_id id)
128{
129 int i;
130 for (i = 0; i < ARRAY_SIZE(sdo_format); ++i)
131 if (sdo_format[i].id & id)
132 return &sdo_format[i];
133 return NULL;
134}
135
136static int sdo_g_tvnorms_output(struct v4l2_subdev *sd, v4l2_std_id *std)
137{
138 *std = V4L2_STD_NTSC_M | V4L2_STD_PAL_M | V4L2_STD_PAL |
139 V4L2_STD_PAL_N | V4L2_STD_PAL_Nc |
140 V4L2_STD_NTSC_443 | V4L2_STD_PAL_60;
141 return 0;
142}
143
144static int sdo_s_std_output(struct v4l2_subdev *sd, v4l2_std_id std)
145{
146 struct sdo_device *sdev = sd_to_sdev(sd);
147 const struct sdo_format *fmt;
148 fmt = sdo_find_format(std);
149 if (fmt == NULL)
150 return -EINVAL;
151 sdev->fmt = fmt;
152 return 0;
153}
154
155static int sdo_g_std_output(struct v4l2_subdev *sd, v4l2_std_id *std)
156{
157 *std = sd_to_sdev(sd)->fmt->id;
158 return 0;
159}
160
161static int sdo_g_mbus_fmt(struct v4l2_subdev *sd,
162 struct v4l2_mbus_framefmt *fmt)
163{
164 struct sdo_device *sdev = sd_to_sdev(sd);
165
166 if (!sdev->fmt)
167 return -ENXIO;
168 /* all modes are 720 pixels wide */
169 fmt->width = 720;
170 fmt->height = sdev->fmt->height;
171 fmt->code = V4L2_MBUS_FMT_FIXED;
172 fmt->field = V4L2_FIELD_INTERLACED;
173 fmt->colorspace = V4L2_COLORSPACE_JPEG;
174 return 0;
175}
176
177static int sdo_s_power(struct v4l2_subdev *sd, int on)
178{
179 struct sdo_device *sdev = sd_to_sdev(sd);
180 struct device *dev = sdev->dev;
181 int ret;
182
183 dev_info(dev, "sdo_s_power(%d)\n", on);
184
185 if (on)
186 ret = pm_runtime_get_sync(dev);
187 else
188 ret = pm_runtime_put_sync(dev);
189
190 /* only values < 0 indicate errors */
191 return IS_ERR_VALUE(ret) ? ret : 0;
192}
193
194static int sdo_streamon(struct sdo_device *sdev)
195{
196 /* set proper clock for Timing Generator */
197 clk_set_rate(sdev->fout_vpll, 54000000);
198 dev_info(sdev->dev, "fout_vpll.rate = %lu\n",
199 clk_get_rate(sdev->fout_vpll));
200 /* enable clock in SDO */
201 sdo_write_mask(sdev, SDO_CLKCON, ~0, SDO_TVOUT_CLOCK_ON);
202 clk_enable(sdev->dacphy);
203 /* enable DAC */
204 sdo_write_mask(sdev, SDO_DAC, ~0, SDO_POWER_ON_DAC);
205 sdo_reg_debug(sdev);
206 return 0;
207}
208
209static int sdo_streamoff(struct sdo_device *sdev)
210{
211 int tries;
212
213 sdo_write_mask(sdev, SDO_DAC, 0, SDO_POWER_ON_DAC);
214 clk_disable(sdev->dacphy);
215 sdo_write_mask(sdev, SDO_CLKCON, 0, SDO_TVOUT_CLOCK_ON);
216 for (tries = 100; tries; --tries) {
217 if (sdo_read(sdev, SDO_CLKCON) & SDO_TVOUT_CLOCK_READY)
218 break;
219 mdelay(1);
220 }
221 if (tries == 0)
222 dev_err(sdev->dev, "failed to stop streaming\n");
223 return tries ? 0 : -EIO;
224}
225
226static int sdo_s_stream(struct v4l2_subdev *sd, int on)
227{
228 struct sdo_device *sdev = sd_to_sdev(sd);
229 return on ? sdo_streamon(sdev) : sdo_streamoff(sdev);
230}
231
232static const struct v4l2_subdev_core_ops sdo_sd_core_ops = {
233 .s_power = sdo_s_power,
234};
235
236static const struct v4l2_subdev_video_ops sdo_sd_video_ops = {
237 .s_std_output = sdo_s_std_output,
238 .g_std_output = sdo_g_std_output,
239 .g_tvnorms_output = sdo_g_tvnorms_output,
240 .g_mbus_fmt = sdo_g_mbus_fmt,
241 .s_stream = sdo_s_stream,
242};
243
244static const struct v4l2_subdev_ops sdo_sd_ops = {
245 .core = &sdo_sd_core_ops,
246 .video = &sdo_sd_video_ops,
247};
248
249static int sdo_runtime_suspend(struct device *dev)
250{
251 struct v4l2_subdev *sd = dev_get_drvdata(dev);
252 struct sdo_device *sdev = sd_to_sdev(sd);
253
254 dev_info(dev, "suspend\n");
255 regulator_disable(sdev->vdet);
256 regulator_disable(sdev->vdac);
257 clk_disable(sdev->sclk_dac);
258 return 0;
259}
260
261static int sdo_runtime_resume(struct device *dev)
262{
263 struct v4l2_subdev *sd = dev_get_drvdata(dev);
264 struct sdo_device *sdev = sd_to_sdev(sd);
265
266 dev_info(dev, "resume\n");
267 clk_enable(sdev->sclk_dac);
268 regulator_enable(sdev->vdac);
269 regulator_enable(sdev->vdet);
270
271 /* software reset */
272 sdo_write_mask(sdev, SDO_CLKCON, ~0, SDO_TVOUT_SW_RESET);
273 mdelay(10);
274 sdo_write_mask(sdev, SDO_CLKCON, 0, SDO_TVOUT_SW_RESET);
275
276 /* setting TV mode */
277 sdo_write_mask(sdev, SDO_CONFIG, sdev->fmt->cookie, SDO_STANDARD_MASK);
278 /* XXX: forcing interlaced mode using undocumented bit */
279 sdo_write_mask(sdev, SDO_CONFIG, 0, SDO_PROGRESSIVE);
280 /* turn all VBI off */
281 sdo_write_mask(sdev, SDO_VBI, 0, SDO_CVBS_WSS_INS |
282 SDO_CVBS_CLOSED_CAPTION_MASK);
283 /* turn all post processing off */
284 sdo_write_mask(sdev, SDO_CCCON, ~0, SDO_COMPENSATION_BHS_ADJ_OFF |
285 SDO_COMPENSATION_CVBS_COMP_OFF);
286 sdo_reg_debug(sdev);
287 return 0;
288}
289
290static const struct dev_pm_ops sdo_pm_ops = {
291 .runtime_suspend = sdo_runtime_suspend,
292 .runtime_resume = sdo_runtime_resume,
293};
294
295static int __devinit sdo_probe(struct platform_device *pdev)
296{
297 struct device *dev = &pdev->dev;
298 struct sdo_device *sdev;
299 struct resource *res;
300 int ret = 0;
301 struct clk *sclk_vpll;
302
303 dev_info(dev, "probe start\n");
304 sdev = devm_kzalloc(&pdev->dev, sizeof *sdev, GFP_KERNEL);
305 if (!sdev) {
306 dev_err(dev, "not enough memory.\n");
307 ret = -ENOMEM;
308 goto fail;
309 }
310 sdev->dev = dev;
311
312 /* mapping registers */
313 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
314 if (res == NULL) {
315 dev_err(dev, "get memory resource failed.\n");
316 ret = -ENXIO;
317 goto fail;
318 }
319
320 sdev->regs = devm_ioremap(&pdev->dev, res->start, resource_size(res));
321 if (sdev->regs == NULL) {
322 dev_err(dev, "register mapping failed.\n");
323 ret = -ENXIO;
324 goto fail;
325 }
326
327 /* acquiring interrupt */
328 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
329 if (res == NULL) {
330 dev_err(dev, "get interrupt resource failed.\n");
331 ret = -ENXIO;
332 goto fail;
333 }
334 ret = devm_request_irq(&pdev->dev, res->start, sdo_irq_handler, 0,
335 "s5p-sdo", sdev);
336 if (ret) {
337 dev_err(dev, "request interrupt failed.\n");
338 goto fail;
339 }
340 sdev->irq = res->start;
341
342 /* acquire clocks */
343 sdev->sclk_dac = clk_get(dev, "sclk_dac");
344 if (IS_ERR_OR_NULL(sdev->sclk_dac)) {
345 dev_err(dev, "failed to get clock 'sclk_dac'\n");
346 ret = -ENXIO;
347 goto fail;
348 }
349 sdev->dac = clk_get(dev, "dac");
350 if (IS_ERR_OR_NULL(sdev->dac)) {
351 dev_err(dev, "failed to get clock 'dac'\n");
352 ret = -ENXIO;
353 goto fail_sclk_dac;
354 }
355 sdev->dacphy = clk_get(dev, "dacphy");
356 if (IS_ERR_OR_NULL(sdev->dacphy)) {
357 dev_err(dev, "failed to get clock 'dacphy'\n");
358 ret = -ENXIO;
359 goto fail_dac;
360 }
361 sclk_vpll = clk_get(dev, "sclk_vpll");
362 if (IS_ERR_OR_NULL(sclk_vpll)) {
363 dev_err(dev, "failed to get clock 'sclk_vpll'\n");
364 ret = -ENXIO;
365 goto fail_dacphy;
366 }
367 clk_set_parent(sdev->sclk_dac, sclk_vpll);
368 clk_put(sclk_vpll);
369 sdev->fout_vpll = clk_get(dev, "fout_vpll");
370 if (IS_ERR_OR_NULL(sdev->fout_vpll)) {
371 dev_err(dev, "failed to get clock 'fout_vpll'\n");
372 goto fail_dacphy;
373 }
374 dev_info(dev, "fout_vpll.rate = %lu\n", clk_get_rate(sclk_vpll));
375
376 /* acquire regulator */
377 sdev->vdac = regulator_get(dev, "vdd33a_dac");
378 if (IS_ERR_OR_NULL(sdev->vdac)) {
379 dev_err(dev, "failed to get regulator 'vdac'\n");
380 goto fail_fout_vpll;
381 }
382 sdev->vdet = regulator_get(dev, "vdet");
383 if (IS_ERR_OR_NULL(sdev->vdet)) {
384 dev_err(dev, "failed to get regulator 'vdet'\n");
385 goto fail_vdac;
386 }
387
388 /* enable gate for dac clock, because mixer uses it */
389 clk_enable(sdev->dac);
390
391 /* configure power management */
392 pm_runtime_enable(dev);
393
394 /* configuration of interface subdevice */
395 v4l2_subdev_init(&sdev->sd, &sdo_sd_ops);
396 sdev->sd.owner = THIS_MODULE;
397 strlcpy(sdev->sd.name, "s5p-sdo", sizeof sdev->sd.name);
398
399 /* set default format */
400 sdev->fmt = sdo_find_format(SDO_DEFAULT_STD);
401 BUG_ON(sdev->fmt == NULL);
402
403 /* keeping subdev in device's private for use by other drivers */
404 dev_set_drvdata(dev, &sdev->sd);
405
406 dev_info(dev, "probe succeeded\n");
407 return 0;
408
409fail_vdac:
410 regulator_put(sdev->vdac);
411fail_fout_vpll:
412 clk_put(sdev->fout_vpll);
413fail_dacphy:
414 clk_put(sdev->dacphy);
415fail_dac:
416 clk_put(sdev->dac);
417fail_sclk_dac:
418 clk_put(sdev->sclk_dac);
419fail:
420 dev_info(dev, "probe failed\n");
421 return ret;
422}
423
424static int __devexit sdo_remove(struct platform_device *pdev)
425{
426 struct v4l2_subdev *sd = dev_get_drvdata(&pdev->dev);
427 struct sdo_device *sdev = sd_to_sdev(sd);
428
429 pm_runtime_disable(&pdev->dev);
430 clk_disable(sdev->dac);
431 regulator_put(sdev->vdet);
432 regulator_put(sdev->vdac);
433 clk_put(sdev->fout_vpll);
434 clk_put(sdev->dacphy);
435 clk_put(sdev->dac);
436 clk_put(sdev->sclk_dac);
437
438 dev_info(&pdev->dev, "remove successful\n");
439 return 0;
440}
441
442static struct platform_driver sdo_driver __refdata = {
443 .probe = sdo_probe,
444 .remove = __devexit_p(sdo_remove),
445 .driver = {
446 .name = "s5p-sdo",
447 .owner = THIS_MODULE,
448 .pm = &sdo_pm_ops,
449 }
450};
451
452module_platform_driver(sdo_driver);