1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * s3c24xx/s3c64xx SoC series Camera Interface (CAMIF) driver
4 *
5 * Copyright (C) 2012 Sylwester Nawrocki <sylvester.nawrocki@gmail.com>
6 * Copyright (C) 2012 Tomasz Figa <tomasz.figa@gmail.com>
7 */
8 #define pr_fmt(fmt) "%s:%d " fmt, __func__, __LINE__
9
10 #include <linux/bug.h>
11 #include <linux/clk.h>
12 #include <linux/delay.h>
13 #include <linux/device.h>
14 #include <linux/errno.h>
15 #include <linux/gpio.h>
16 #include <linux/i2c.h>
17 #include <linux/interrupt.h>
18 #include <linux/io.h>
19 #include <linux/kernel.h>
20 #include <linux/list.h>
21 #include <linux/module.h>
22 #include <linux/platform_device.h>
23 #include <linux/pm_runtime.h>
24 #include <linux/slab.h>
25 #include <linux/types.h>
26
27 #include <media/media-device.h>
28 #include <media/v4l2-ctrls.h>
29 #include <media/v4l2-ioctl.h>
30 #include <media/videobuf2-v4l2.h>
31 #include <media/videobuf2-dma-contig.h>
32
33 #include "camif-core.h"
34
35 static char *camif_clocks[CLK_MAX_NUM] = {
36 /* HCLK CAMIF clock */
37 [CLK_GATE] = "camif",
38 /* CAMIF / external camera sensor master clock */
39 [CLK_CAM] = "camera",
40 };
41
42 static const struct camif_fmt camif_formats[] = {
43 {
44 .fourcc = V4L2_PIX_FMT_YUV422P,
45 .depth = 16,
46 .ybpp = 1,
47 .color = IMG_FMT_YCBCR422P,
48 .colplanes = 3,
49 .flags = FMT_FL_S3C24XX_CODEC |
50 FMT_FL_S3C64XX,
51 }, {
52 .fourcc = V4L2_PIX_FMT_YUV420,
53 .depth = 12,
54 .ybpp = 1,
55 .color = IMG_FMT_YCBCR420,
56 .colplanes = 3,
57 .flags = FMT_FL_S3C24XX_CODEC |
58 FMT_FL_S3C64XX,
59 }, {
60 .fourcc = V4L2_PIX_FMT_YVU420,
61 .depth = 12,
62 .ybpp = 1,
63 .color = IMG_FMT_YCRCB420,
64 .colplanes = 3,
65 .flags = FMT_FL_S3C24XX_CODEC |
66 FMT_FL_S3C64XX,
67 }, {
68 .fourcc = V4L2_PIX_FMT_RGB565X,
69 .depth = 16,
70 .ybpp = 2,
71 .color = IMG_FMT_RGB565,
72 .colplanes = 1,
73 .flags = FMT_FL_S3C24XX_PREVIEW |
74 FMT_FL_S3C64XX,
75 }, {
76 .fourcc = V4L2_PIX_FMT_RGB32,
77 .depth = 32,
78 .ybpp = 4,
79 .color = IMG_FMT_XRGB8888,
80 .colplanes = 1,
81 .flags = FMT_FL_S3C24XX_PREVIEW |
82 FMT_FL_S3C64XX,
83 }, {
84 .fourcc = V4L2_PIX_FMT_BGR666,
85 .depth = 32,
86 .ybpp = 4,
87 .color = IMG_FMT_RGB666,
88 .colplanes = 1,
89 .flags = FMT_FL_S3C64XX,
90 }
91 };
92
93 /**
94 * s3c_camif_find_format() - lookup camif color format by fourcc or an index
95 * @vp: video path (DMA) description (codec/preview)
96 * @pixelformat: fourcc to match, ignored if null
97 * @index: index to the camif_formats array, ignored if negative
98 */
s3c_camif_find_format(struct camif_vp * vp,const u32 * pixelformat,int index)99 const struct camif_fmt *s3c_camif_find_format(struct camif_vp *vp,
100 const u32 *pixelformat,
101 int index)
102 {
103 const struct camif_fmt *fmt, *def_fmt = NULL;
104 unsigned int i;
105 int id = 0;
106
107 if (index >= (int)ARRAY_SIZE(camif_formats))
108 return NULL;
109
110 for (i = 0; i < ARRAY_SIZE(camif_formats); ++i) {
111 fmt = &camif_formats[i];
112 if (vp && !(vp->fmt_flags & fmt->flags))
113 continue;
114 if (pixelformat && fmt->fourcc == *pixelformat)
115 return fmt;
116 if (index == id)
117 def_fmt = fmt;
118 id++;
119 }
120 return def_fmt;
121 }
122
camif_get_scaler_factor(u32 src,u32 tar,u32 * ratio,u32 * shift)123 static int camif_get_scaler_factor(u32 src, u32 tar, u32 *ratio, u32 *shift)
124 {
125 unsigned int sh = 6;
126
127 if (src >= 64 * tar)
128 return -EINVAL;
129
130 while (sh--) {
131 unsigned int tmp = 1 << sh;
132 if (src >= tar * tmp) {
133 *shift = sh;
134 *ratio = tmp;
135 return 0;
136 }
137 }
138 *shift = 0;
139 *ratio = 1;
140 return 0;
141 }
142
s3c_camif_get_scaler_config(struct camif_vp * vp,struct camif_scaler * scaler)143 int s3c_camif_get_scaler_config(struct camif_vp *vp,
144 struct camif_scaler *scaler)
145 {
146 struct v4l2_rect *camif_crop = &vp->camif->camif_crop;
147 int source_x = camif_crop->width;
148 int source_y = camif_crop->height;
149 int target_x = vp->out_frame.rect.width;
150 int target_y = vp->out_frame.rect.height;
151 int ret;
152
153 if (vp->rotation == 90 || vp->rotation == 270)
154 swap(target_x, target_y);
155
156 ret = camif_get_scaler_factor(source_x, target_x, &scaler->pre_h_ratio,
157 &scaler->h_shift);
158 if (ret < 0)
159 return ret;
160
161 ret = camif_get_scaler_factor(source_y, target_y, &scaler->pre_v_ratio,
162 &scaler->v_shift);
163 if (ret < 0)
164 return ret;
165
166 scaler->pre_dst_width = source_x / scaler->pre_h_ratio;
167 scaler->pre_dst_height = source_y / scaler->pre_v_ratio;
168
169 scaler->main_h_ratio = (source_x << 8) / (target_x << scaler->h_shift);
170 scaler->main_v_ratio = (source_y << 8) / (target_y << scaler->v_shift);
171
172 scaler->scaleup_h = (target_x >= source_x);
173 scaler->scaleup_v = (target_y >= source_y);
174
175 scaler->copy = 0;
176
177 pr_debug("H: ratio: %u, shift: %u. V: ratio: %u, shift: %u.\n",
178 scaler->pre_h_ratio, scaler->h_shift,
179 scaler->pre_v_ratio, scaler->v_shift);
180
181 pr_debug("Source: %dx%d, Target: %dx%d, scaleup_h/v: %d/%d\n",
182 source_x, source_y, target_x, target_y,
183 scaler->scaleup_h, scaler->scaleup_v);
184
185 return 0;
186 }
187
camif_register_sensor(struct camif_dev * camif)188 static int camif_register_sensor(struct camif_dev *camif)
189 {
190 struct s3c_camif_sensor_info *sensor = &camif->pdata.sensor;
191 struct v4l2_device *v4l2_dev = &camif->v4l2_dev;
192 struct i2c_adapter *adapter;
193 struct v4l2_subdev_format format = {
194 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
195 };
196 struct v4l2_subdev *sd;
197 int ret;
198
199 camif->sensor.sd = NULL;
200
201 if (sensor->i2c_board_info.addr == 0)
202 return -EINVAL;
203
204 adapter = i2c_get_adapter(sensor->i2c_bus_num);
205 if (adapter == NULL) {
206 v4l2_warn(v4l2_dev, "failed to get I2C adapter %d\n",
207 sensor->i2c_bus_num);
208 return -EPROBE_DEFER;
209 }
210
211 sd = v4l2_i2c_new_subdev_board(v4l2_dev, adapter,
212 &sensor->i2c_board_info, NULL);
213 if (sd == NULL) {
214 i2c_put_adapter(adapter);
215 v4l2_warn(v4l2_dev, "failed to acquire subdev %s\n",
216 sensor->i2c_board_info.type);
217 return -EPROBE_DEFER;
218 }
219 camif->sensor.sd = sd;
220
221 v4l2_info(v4l2_dev, "registered sensor subdevice %s\n", sd->name);
222
223 /* Get initial pixel format and set it at the camif sink pad */
224 format.pad = 0;
225 ret = v4l2_subdev_call(sd, pad, get_fmt, NULL, &format);
226
227 if (ret < 0)
228 return 0;
229
230 format.pad = CAMIF_SD_PAD_SINK;
231 v4l2_subdev_call(&camif->subdev, pad, set_fmt, NULL, &format);
232
233 v4l2_info(sd, "Initial format from sensor: %dx%d, %#x\n",
234 format.format.width, format.format.height,
235 format.format.code);
236 return 0;
237 }
238
camif_unregister_sensor(struct camif_dev * camif)239 static void camif_unregister_sensor(struct camif_dev *camif)
240 {
241 struct v4l2_subdev *sd = camif->sensor.sd;
242 struct i2c_client *client = sd ? v4l2_get_subdevdata(sd) : NULL;
243 struct i2c_adapter *adapter;
244
245 if (client == NULL)
246 return;
247
248 adapter = client->adapter;
249 v4l2_device_unregister_subdev(sd);
250 camif->sensor.sd = NULL;
251 i2c_unregister_device(client);
252 i2c_put_adapter(adapter);
253 }
254
camif_create_media_links(struct camif_dev * camif)255 static int camif_create_media_links(struct camif_dev *camif)
256 {
257 int i, ret;
258
259 ret = media_create_pad_link(&camif->sensor.sd->entity, 0,
260 &camif->subdev.entity, CAMIF_SD_PAD_SINK,
261 MEDIA_LNK_FL_IMMUTABLE |
262 MEDIA_LNK_FL_ENABLED);
263 if (ret)
264 return ret;
265
266 for (i = 1; i < CAMIF_SD_PADS_NUM && !ret; i++) {
267 ret = media_create_pad_link(&camif->subdev.entity, i,
268 &camif->vp[i - 1].vdev.entity, 0,
269 MEDIA_LNK_FL_IMMUTABLE |
270 MEDIA_LNK_FL_ENABLED);
271 }
272
273 return ret;
274 }
275
camif_register_video_nodes(struct camif_dev * camif)276 static int camif_register_video_nodes(struct camif_dev *camif)
277 {
278 int ret = s3c_camif_register_video_node(camif, VP_CODEC);
279 if (ret < 0)
280 return ret;
281
282 return s3c_camif_register_video_node(camif, VP_PREVIEW);
283 }
284
camif_unregister_video_nodes(struct camif_dev * camif)285 static void camif_unregister_video_nodes(struct camif_dev *camif)
286 {
287 s3c_camif_unregister_video_node(camif, VP_CODEC);
288 s3c_camif_unregister_video_node(camif, VP_PREVIEW);
289 }
290
camif_unregister_media_entities(struct camif_dev * camif)291 static void camif_unregister_media_entities(struct camif_dev *camif)
292 {
293 camif_unregister_video_nodes(camif);
294 camif_unregister_sensor(camif);
295 }
296
297 /*
298 * Media device
299 */
camif_media_dev_init(struct camif_dev * camif)300 static int camif_media_dev_init(struct camif_dev *camif)
301 {
302 struct media_device *md = &camif->media_dev;
303 struct v4l2_device *v4l2_dev = &camif->v4l2_dev;
304 unsigned int ip_rev = camif->variant->ip_revision;
305 int ret;
306
307 memset(md, 0, sizeof(*md));
308 snprintf(md->model, sizeof(md->model), "Samsung S3C%s CAMIF",
309 ip_rev == S3C6410_CAMIF_IP_REV ? "6410" : "244X");
310 strscpy(md->bus_info, "platform", sizeof(md->bus_info));
311 md->hw_revision = ip_rev;
312
313 md->dev = camif->dev;
314
315 strscpy(v4l2_dev->name, "s3c-camif", sizeof(v4l2_dev->name));
316 v4l2_dev->mdev = md;
317
318 media_device_init(md);
319
320 ret = v4l2_device_register(camif->dev, v4l2_dev);
321 if (ret < 0)
322 return ret;
323
324 return ret;
325 }
326
camif_clk_put(struct camif_dev * camif)327 static void camif_clk_put(struct camif_dev *camif)
328 {
329 int i;
330
331 for (i = 0; i < CLK_MAX_NUM; i++) {
332 if (IS_ERR(camif->clock[i]))
333 continue;
334 clk_unprepare(camif->clock[i]);
335 clk_put(camif->clock[i]);
336 camif->clock[i] = ERR_PTR(-EINVAL);
337 }
338 }
339
camif_clk_get(struct camif_dev * camif)340 static int camif_clk_get(struct camif_dev *camif)
341 {
342 int ret, i;
343
344 for (i = 1; i < CLK_MAX_NUM; i++)
345 camif->clock[i] = ERR_PTR(-EINVAL);
346
347 for (i = 0; i < CLK_MAX_NUM; i++) {
348 camif->clock[i] = clk_get(camif->dev, camif_clocks[i]);
349 if (IS_ERR(camif->clock[i])) {
350 ret = PTR_ERR(camif->clock[i]);
351 goto err;
352 }
353 ret = clk_prepare(camif->clock[i]);
354 if (ret < 0) {
355 clk_put(camif->clock[i]);
356 camif->clock[i] = NULL;
357 goto err;
358 }
359 }
360 return 0;
361 err:
362 camif_clk_put(camif);
363 dev_err(camif->dev, "failed to get clock: %s\n",
364 camif_clocks[i]);
365 return ret;
366 }
367
368 /*
369 * The CAMIF device has two relatively independent data processing paths
370 * that can source data from memory or the common camera input frontend.
371 * Register interrupts for each data processing path (camif_vp).
372 */
camif_request_irqs(struct platform_device * pdev,struct camif_dev * camif)373 static int camif_request_irqs(struct platform_device *pdev,
374 struct camif_dev *camif)
375 {
376 int irq, ret, i;
377
378 for (i = 0; i < CAMIF_VP_NUM; i++) {
379 struct camif_vp *vp = &camif->vp[i];
380
381 init_waitqueue_head(&vp->irq_queue);
382
383 irq = platform_get_irq(pdev, i);
384 if (irq < 0)
385 return irq;
386
387 ret = devm_request_irq(&pdev->dev, irq, s3c_camif_irq_handler,
388 0, dev_name(&pdev->dev), vp);
389 if (ret < 0) {
390 dev_err(&pdev->dev, "failed to install IRQ: %d\n", ret);
391 break;
392 }
393 }
394
395 return ret;
396 }
397
s3c_camif_probe(struct platform_device * pdev)398 static int s3c_camif_probe(struct platform_device *pdev)
399 {
400 struct device *dev = &pdev->dev;
401 struct s3c_camif_plat_data *pdata = dev->platform_data;
402 struct s3c_camif_drvdata *drvdata;
403 struct camif_dev *camif;
404 int ret = 0;
405
406 camif = devm_kzalloc(dev, sizeof(*camif), GFP_KERNEL);
407 if (!camif)
408 return -ENOMEM;
409
410 spin_lock_init(&camif->slock);
411 mutex_init(&camif->lock);
412
413 camif->dev = dev;
414
415 if (!pdata || !pdata->gpio_get || !pdata->gpio_put) {
416 dev_err(dev, "wrong platform data\n");
417 return -EINVAL;
418 }
419
420 camif->pdata = *pdata;
421 drvdata = (void *)platform_get_device_id(pdev)->driver_data;
422 camif->variant = drvdata->variant;
423
424 camif->io_base = devm_platform_ioremap_resource(pdev, 0);
425 if (IS_ERR(camif->io_base))
426 return PTR_ERR(camif->io_base);
427
428 ret = camif_request_irqs(pdev, camif);
429 if (ret < 0)
430 return ret;
431
432 ret = pdata->gpio_get();
433 if (ret < 0)
434 return ret;
435
436 ret = s3c_camif_create_subdev(camif);
437 if (ret < 0)
438 goto err_sd;
439
440 ret = camif_clk_get(camif);
441 if (ret < 0)
442 goto err_clk;
443
444 platform_set_drvdata(pdev, camif);
445 clk_set_rate(camif->clock[CLK_CAM],
446 camif->pdata.sensor.clock_frequency);
447
448 dev_info(dev, "sensor clock frequency: %lu\n",
449 clk_get_rate(camif->clock[CLK_CAM]));
450 /*
451 * Set initial pixel format, resolution and crop rectangle.
452 * Must be done before a sensor subdev is registered as some
453 * settings are overrode with values from sensor subdev.
454 */
455 s3c_camif_set_defaults(camif);
456
457 pm_runtime_enable(dev);
458
459 ret = pm_runtime_resume_and_get(dev);
460 if (ret < 0)
461 goto err_disable;
462
463 ret = camif_media_dev_init(camif);
464 if (ret < 0)
465 goto err_pm;
466
467 ret = camif_register_sensor(camif);
468 if (ret < 0)
469 goto err_sens;
470
471 ret = v4l2_device_register_subdev(&camif->v4l2_dev, &camif->subdev);
472 if (ret < 0)
473 goto err_sens;
474
475 ret = v4l2_device_register_subdev_nodes(&camif->v4l2_dev);
476 if (ret < 0)
477 goto err_sens;
478
479 ret = camif_register_video_nodes(camif);
480 if (ret < 0)
481 goto err_sens;
482
483 ret = camif_create_media_links(camif);
484 if (ret < 0)
485 goto err_sens;
486
487 ret = media_device_register(&camif->media_dev);
488 if (ret < 0)
489 goto err_sens;
490
491 pm_runtime_put(dev);
492 return 0;
493
494 err_sens:
495 v4l2_device_unregister(&camif->v4l2_dev);
496 media_device_unregister(&camif->media_dev);
497 media_device_cleanup(&camif->media_dev);
498 camif_unregister_media_entities(camif);
499 err_pm:
500 pm_runtime_put(dev);
501 err_disable:
502 pm_runtime_disable(dev);
503 camif_clk_put(camif);
504 err_clk:
505 s3c_camif_unregister_subdev(camif);
506 err_sd:
507 pdata->gpio_put();
508 return ret;
509 }
510
s3c_camif_remove(struct platform_device * pdev)511 static void s3c_camif_remove(struct platform_device *pdev)
512 {
513 struct camif_dev *camif = platform_get_drvdata(pdev);
514 struct s3c_camif_plat_data *pdata = &camif->pdata;
515
516 media_device_unregister(&camif->media_dev);
517 media_device_cleanup(&camif->media_dev);
518 camif_unregister_media_entities(camif);
519 v4l2_device_unregister(&camif->v4l2_dev);
520
521 pm_runtime_disable(&pdev->dev);
522 camif_clk_put(camif);
523 s3c_camif_unregister_subdev(camif);
524 pdata->gpio_put();
525 }
526
s3c_camif_runtime_resume(struct device * dev)527 static int s3c_camif_runtime_resume(struct device *dev)
528 {
529 struct camif_dev *camif = dev_get_drvdata(dev);
530
531 clk_enable(camif->clock[CLK_GATE]);
532 /* null op on s3c244x */
533 clk_enable(camif->clock[CLK_CAM]);
534 return 0;
535 }
536
s3c_camif_runtime_suspend(struct device * dev)537 static int s3c_camif_runtime_suspend(struct device *dev)
538 {
539 struct camif_dev *camif = dev_get_drvdata(dev);
540
541 /* null op on s3c244x */
542 clk_disable(camif->clock[CLK_CAM]);
543
544 clk_disable(camif->clock[CLK_GATE]);
545 return 0;
546 }
547
548 static const struct s3c_camif_variant s3c244x_camif_variant = {
549 .vp_pix_limits = {
550 [VP_CODEC] = {
551 .max_out_width = 4096,
552 .max_sc_out_width = 2048,
553 .out_width_align = 16,
554 .min_out_width = 16,
555 .max_height = 4096,
556 },
557 [VP_PREVIEW] = {
558 .max_out_width = 640,
559 .max_sc_out_width = 640,
560 .out_width_align = 16,
561 .min_out_width = 16,
562 .max_height = 480,
563 }
564 },
565 .pix_limits = {
566 .win_hor_offset_align = 8,
567 },
568 .ip_revision = S3C244X_CAMIF_IP_REV,
569 };
570
571 static struct s3c_camif_drvdata s3c244x_camif_drvdata = {
572 .variant = &s3c244x_camif_variant,
573 .bus_clk_freq = 24000000UL,
574 };
575
576 static const struct s3c_camif_variant s3c6410_camif_variant = {
577 .vp_pix_limits = {
578 [VP_CODEC] = {
579 .max_out_width = 4096,
580 .max_sc_out_width = 2048,
581 .out_width_align = 16,
582 .min_out_width = 16,
583 .max_height = 4096,
584 },
585 [VP_PREVIEW] = {
586 .max_out_width = 4096,
587 .max_sc_out_width = 720,
588 .out_width_align = 16,
589 .min_out_width = 16,
590 .max_height = 4096,
591 }
592 },
593 .pix_limits = {
594 .win_hor_offset_align = 8,
595 },
596 .ip_revision = S3C6410_CAMIF_IP_REV,
597 .has_img_effect = 1,
598 .vp_offset = 0x20,
599 };
600
601 static struct s3c_camif_drvdata s3c6410_camif_drvdata = {
602 .variant = &s3c6410_camif_variant,
603 .bus_clk_freq = 133000000UL,
604 };
605
606 static const struct platform_device_id s3c_camif_driver_ids[] = {
607 {
608 .name = "s3c2440-camif",
609 .driver_data = (unsigned long)&s3c244x_camif_drvdata,
610 }, {
611 .name = "s3c6410-camif",
612 .driver_data = (unsigned long)&s3c6410_camif_drvdata,
613 },
614 { /* sentinel */ },
615 };
616 MODULE_DEVICE_TABLE(platform, s3c_camif_driver_ids);
617
618 static const struct dev_pm_ops s3c_camif_pm_ops = {
619 .runtime_suspend = s3c_camif_runtime_suspend,
620 .runtime_resume = s3c_camif_runtime_resume,
621 };
622
623 static struct platform_driver s3c_camif_driver = {
624 .probe = s3c_camif_probe,
625 .remove_new = s3c_camif_remove,
626 .id_table = s3c_camif_driver_ids,
627 .driver = {
628 .name = S3C_CAMIF_DRIVER_NAME,
629 .pm = &s3c_camif_pm_ops,
630 }
631 };
632
633 module_platform_driver(s3c_camif_driver);
634
635 MODULE_AUTHOR("Sylwester Nawrocki <sylvester.nawrocki@gmail.com>");
636 MODULE_AUTHOR("Tomasz Figa <tomasz.figa@gmail.com>");
637 MODULE_DESCRIPTION("S3C24XX/S3C64XX SoC camera interface driver");
638 MODULE_LICENSE("GPL");
639