GNU Linux-libre 6.8.7-gnu
[releases.git] / drivers / staging / media / omap4iss / iss_ipipeif.c
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * TI OMAP4 ISS V4L2 Driver - ISP IPIPEIF module
4  *
5  * Copyright (C) 2012 Texas Instruments, Inc.
6  *
7  * Author: Sergio Aguirre <sergio.a.aguirre@gmail.com>
8  */
9
10 #include <linux/module.h>
11 #include <linux/uaccess.h>
12 #include <linux/delay.h>
13 #include <linux/device.h>
14 #include <linux/dma-mapping.h>
15 #include <linux/mm.h>
16 #include <linux/sched.h>
17
18 #include "iss.h"
19 #include "iss_regs.h"
20 #include "iss_ipipeif.h"
21
22 static const unsigned int ipipeif_fmts[] = {
23         MEDIA_BUS_FMT_SGRBG10_1X10,
24         MEDIA_BUS_FMT_SRGGB10_1X10,
25         MEDIA_BUS_FMT_SBGGR10_1X10,
26         MEDIA_BUS_FMT_SGBRG10_1X10,
27         MEDIA_BUS_FMT_UYVY8_1X16,
28         MEDIA_BUS_FMT_YUYV8_1X16,
29 };
30
31 /*
32  * ipipeif_print_status - Print current IPIPEIF Module register values.
33  * @ipipeif: Pointer to ISS ISP IPIPEIF device.
34  *
35  * Also prints other debug information stored in the IPIPEIF module.
36  */
37 #define IPIPEIF_PRINT_REGISTER(iss, name)\
38         dev_dbg(iss->dev, "###IPIPEIF " #name "=0x%08x\n", \
39                 iss_reg_read(iss, OMAP4_ISS_MEM_ISP_IPIPEIF, IPIPEIF_##name))
40
41 #define ISIF_PRINT_REGISTER(iss, name)\
42         dev_dbg(iss->dev, "###ISIF " #name "=0x%08x\n", \
43                 iss_reg_read(iss, OMAP4_ISS_MEM_ISP_ISIF, ISIF_##name))
44
45 #define ISP5_PRINT_REGISTER(iss, name)\
46         dev_dbg(iss->dev, "###ISP5 " #name "=0x%08x\n", \
47                 iss_reg_read(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_##name))
48
49 static void ipipeif_print_status(struct iss_ipipeif_device *ipipeif)
50 {
51         struct iss_device *iss = to_iss_device(ipipeif);
52
53         dev_dbg(iss->dev, "-------------IPIPEIF Register dump-------------\n");
54
55         IPIPEIF_PRINT_REGISTER(iss, CFG1);
56         IPIPEIF_PRINT_REGISTER(iss, CFG2);
57
58         ISIF_PRINT_REGISTER(iss, SYNCEN);
59         ISIF_PRINT_REGISTER(iss, CADU);
60         ISIF_PRINT_REGISTER(iss, CADL);
61         ISIF_PRINT_REGISTER(iss, MODESET);
62         ISIF_PRINT_REGISTER(iss, CCOLP);
63         ISIF_PRINT_REGISTER(iss, SPH);
64         ISIF_PRINT_REGISTER(iss, LNH);
65         ISIF_PRINT_REGISTER(iss, LNV);
66         ISIF_PRINT_REGISTER(iss, VDINT(0));
67         ISIF_PRINT_REGISTER(iss, HSIZE);
68
69         ISP5_PRINT_REGISTER(iss, SYSCONFIG);
70         ISP5_PRINT_REGISTER(iss, CTRL);
71         ISP5_PRINT_REGISTER(iss, IRQSTATUS(0));
72         ISP5_PRINT_REGISTER(iss, IRQENABLE_SET(0));
73         ISP5_PRINT_REGISTER(iss, IRQENABLE_CLR(0));
74
75         dev_dbg(iss->dev, "-----------------------------------------------\n");
76 }
77
78 static void ipipeif_write_enable(struct iss_ipipeif_device *ipipeif, u8 enable)
79 {
80         struct iss_device *iss = to_iss_device(ipipeif);
81
82         iss_reg_update(iss, OMAP4_ISS_MEM_ISP_ISIF, ISIF_SYNCEN,
83                        ISIF_SYNCEN_DWEN, enable ? ISIF_SYNCEN_DWEN : 0);
84 }
85
86 /*
87  * ipipeif_enable - Enable/Disable IPIPEIF.
88  * @enable: enable flag
89  *
90  */
91 static void ipipeif_enable(struct iss_ipipeif_device *ipipeif, u8 enable)
92 {
93         struct iss_device *iss = to_iss_device(ipipeif);
94
95         iss_reg_update(iss, OMAP4_ISS_MEM_ISP_ISIF, ISIF_SYNCEN,
96                        ISIF_SYNCEN_SYEN, enable ? ISIF_SYNCEN_SYEN : 0);
97 }
98
99 /* -----------------------------------------------------------------------------
100  * Format- and pipeline-related configuration helpers
101  */
102
103 /*
104  * ipipeif_set_outaddr - Set memory address to save output image
105  * @ipipeif: Pointer to ISP IPIPEIF device.
106  * @addr: 32-bit memory address aligned on 32 byte boundary.
107  *
108  * Sets the memory address where the output will be saved.
109  */
110 static void ipipeif_set_outaddr(struct iss_ipipeif_device *ipipeif, u32 addr)
111 {
112         struct iss_device *iss = to_iss_device(ipipeif);
113
114         /* Save address split in Base Address H & L */
115         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_ISIF, ISIF_CADU,
116                       (addr >> (16 + 5)) & ISIF_CADU_MASK);
117         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_ISIF, ISIF_CADL,
118                       (addr >> 5) & ISIF_CADL_MASK);
119 }
120
121 static void ipipeif_configure(struct iss_ipipeif_device *ipipeif)
122 {
123         struct iss_device *iss = to_iss_device(ipipeif);
124         const struct iss_format_info *info;
125         struct v4l2_mbus_framefmt *format;
126         u32 isif_ccolp = 0;
127
128         omap4iss_configure_bridge(iss, ipipeif->input);
129
130         /* IPIPEIF_PAD_SINK */
131         format = &ipipeif->formats[IPIPEIF_PAD_SINK];
132
133         /* IPIPEIF with YUV422 input from ISIF */
134         iss_reg_clr(iss, OMAP4_ISS_MEM_ISP_IPIPEIF, IPIPEIF_CFG1,
135                     IPIPEIF_CFG1_INPSRC1_MASK | IPIPEIF_CFG1_INPSRC2_MASK);
136
137         /* Select ISIF/IPIPEIF input format */
138         switch (format->code) {
139         case MEDIA_BUS_FMT_UYVY8_1X16:
140         case MEDIA_BUS_FMT_YUYV8_1X16:
141                 iss_reg_update(iss, OMAP4_ISS_MEM_ISP_ISIF, ISIF_MODESET,
142                                ISIF_MODESET_CCDMD | ISIF_MODESET_INPMOD_MASK |
143                                ISIF_MODESET_CCDW_MASK,
144                                ISIF_MODESET_INPMOD_YCBCR16);
145
146                 iss_reg_update(iss, OMAP4_ISS_MEM_ISP_IPIPEIF, IPIPEIF_CFG2,
147                                IPIPEIF_CFG2_YUV8, IPIPEIF_CFG2_YUV16);
148
149                 break;
150         case MEDIA_BUS_FMT_SGRBG10_1X10:
151                 isif_ccolp = ISIF_CCOLP_CP0_F0_GR |
152                         ISIF_CCOLP_CP1_F0_R |
153                         ISIF_CCOLP_CP2_F0_B |
154                         ISIF_CCOLP_CP3_F0_GB;
155                 goto cont_raw;
156         case MEDIA_BUS_FMT_SRGGB10_1X10:
157                 isif_ccolp = ISIF_CCOLP_CP0_F0_R |
158                         ISIF_CCOLP_CP1_F0_GR |
159                         ISIF_CCOLP_CP2_F0_GB |
160                         ISIF_CCOLP_CP3_F0_B;
161                 goto cont_raw;
162         case MEDIA_BUS_FMT_SBGGR10_1X10:
163                 isif_ccolp = ISIF_CCOLP_CP0_F0_B |
164                         ISIF_CCOLP_CP1_F0_GB |
165                         ISIF_CCOLP_CP2_F0_GR |
166                         ISIF_CCOLP_CP3_F0_R;
167                 goto cont_raw;
168         case MEDIA_BUS_FMT_SGBRG10_1X10:
169                 isif_ccolp = ISIF_CCOLP_CP0_F0_GB |
170                         ISIF_CCOLP_CP1_F0_B |
171                         ISIF_CCOLP_CP2_F0_R |
172                         ISIF_CCOLP_CP3_F0_GR;
173 cont_raw:
174                 iss_reg_clr(iss, OMAP4_ISS_MEM_ISP_IPIPEIF, IPIPEIF_CFG2,
175                             IPIPEIF_CFG2_YUV16);
176
177                 iss_reg_update(iss, OMAP4_ISS_MEM_ISP_ISIF, ISIF_MODESET,
178                                ISIF_MODESET_CCDMD | ISIF_MODESET_INPMOD_MASK |
179                                ISIF_MODESET_CCDW_MASK, ISIF_MODESET_INPMOD_RAW |
180                                ISIF_MODESET_CCDW_2BIT);
181
182                 info = omap4iss_video_format_info(format->code);
183                 iss_reg_update(iss, OMAP4_ISS_MEM_ISP_ISIF, ISIF_CGAMMAWD,
184                                ISIF_CGAMMAWD_GWDI_MASK,
185                                ISIF_CGAMMAWD_GWDI(info->bpp));
186
187                 /* Set RAW Bayer pattern */
188                 iss_reg_write(iss, OMAP4_ISS_MEM_ISP_ISIF, ISIF_CCOLP,
189                               isif_ccolp);
190                 break;
191         }
192
193         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_ISIF, ISIF_SPH, 0 & ISIF_SPH_MASK);
194         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_ISIF, ISIF_LNH,
195                       (format->width - 1) & ISIF_LNH_MASK);
196         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_ISIF, ISIF_LNV,
197                       (format->height - 1) & ISIF_LNV_MASK);
198
199         /* Generate ISIF0 on the last line of the image */
200         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_ISIF, ISIF_VDINT(0),
201                       format->height - 1);
202
203         /* IPIPEIF_PAD_SOURCE_ISIF_SF */
204         format = &ipipeif->formats[IPIPEIF_PAD_SOURCE_ISIF_SF];
205
206         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_ISIF, ISIF_HSIZE,
207                       (ipipeif->video_out.bpl_value >> 5) &
208                       ISIF_HSIZE_HSIZE_MASK);
209
210         /* IPIPEIF_PAD_SOURCE_VP */
211         /* Do nothing? */
212 }
213
214 /* -----------------------------------------------------------------------------
215  * Interrupt handling
216  */
217
218 static void ipipeif_isr_buffer(struct iss_ipipeif_device *ipipeif)
219 {
220         struct iss_buffer *buffer;
221
222         /* The ISIF generates VD0 interrupts even when writes are disabled.
223          * deal with it anyway). Disabling the ISIF when no buffer is available
224          * is thus not be enough, we need to handle the situation explicitly.
225          */
226         if (list_empty(&ipipeif->video_out.dmaqueue))
227                 return;
228
229         ipipeif_write_enable(ipipeif, 0);
230
231         buffer = omap4iss_video_buffer_next(&ipipeif->video_out);
232         if (!buffer)
233                 return;
234
235         ipipeif_set_outaddr(ipipeif, buffer->iss_addr);
236
237         ipipeif_write_enable(ipipeif, 1);
238 }
239
240 /*
241  * omap4iss_ipipeif_isr - Configure ipipeif during interframe time.
242  * @ipipeif: Pointer to ISP IPIPEIF device.
243  * @events: IPIPEIF events
244  */
245 void omap4iss_ipipeif_isr(struct iss_ipipeif_device *ipipeif, u32 events)
246 {
247         if (omap4iss_module_sync_is_stopping(&ipipeif->wait,
248                                              &ipipeif->stopping))
249                 return;
250
251         if ((events & ISP5_IRQ_ISIF_INT(0)) &&
252             (ipipeif->output & IPIPEIF_OUTPUT_MEMORY))
253                 ipipeif_isr_buffer(ipipeif);
254 }
255
256 /* -----------------------------------------------------------------------------
257  * ISP video operations
258  */
259
260 static int ipipeif_video_queue(struct iss_video *video,
261                                struct iss_buffer *buffer)
262 {
263         struct iss_ipipeif_device *ipipeif = container_of(video,
264                                 struct iss_ipipeif_device, video_out);
265
266         if (!(ipipeif->output & IPIPEIF_OUTPUT_MEMORY))
267                 return -ENODEV;
268
269         ipipeif_set_outaddr(ipipeif, buffer->iss_addr);
270
271         /*
272          * If streaming was enabled before there was a buffer queued
273          * or underrun happened in the ISR, the hardware was not enabled
274          * and DMA queue flag ISS_VIDEO_DMAQUEUE_UNDERRUN is still set.
275          * Enable it now.
276          */
277         if (video->dmaqueue_flags & ISS_VIDEO_DMAQUEUE_UNDERRUN) {
278                 if (ipipeif->output & IPIPEIF_OUTPUT_MEMORY)
279                         ipipeif_write_enable(ipipeif, 1);
280                 ipipeif_enable(ipipeif, 1);
281                 iss_video_dmaqueue_flags_clr(video);
282         }
283
284         return 0;
285 }
286
287 static const struct iss_video_operations ipipeif_video_ops = {
288         .queue = ipipeif_video_queue,
289 };
290
291 /* -----------------------------------------------------------------------------
292  * V4L2 subdev operations
293  */
294
295 #define IPIPEIF_DRV_SUBCLK_MASK (OMAP4_ISS_ISP_SUBCLK_IPIPEIF |\
296                                  OMAP4_ISS_ISP_SUBCLK_ISIF)
297 /*
298  * ipipeif_set_stream - Enable/Disable streaming on the IPIPEIF module
299  * @sd: ISP IPIPEIF V4L2 subdevice
300  * @enable: Enable/disable stream
301  */
302 static int ipipeif_set_stream(struct v4l2_subdev *sd, int enable)
303 {
304         struct iss_ipipeif_device *ipipeif = v4l2_get_subdevdata(sd);
305         struct iss_device *iss = to_iss_device(ipipeif);
306         struct iss_video *video_out = &ipipeif->video_out;
307         int ret = 0;
308
309         if (ipipeif->state == ISS_PIPELINE_STREAM_STOPPED) {
310                 if (enable == ISS_PIPELINE_STREAM_STOPPED)
311                         return 0;
312
313                 omap4iss_isp_subclk_enable(iss, IPIPEIF_DRV_SUBCLK_MASK);
314         }
315
316         switch (enable) {
317         case ISS_PIPELINE_STREAM_CONTINUOUS:
318
319                 ipipeif_configure(ipipeif);
320                 ipipeif_print_status(ipipeif);
321
322                 /*
323                  * When outputting to memory with no buffer available, let the
324                  * buffer queue handler start the hardware. A DMA queue flag
325                  * ISS_VIDEO_DMAQUEUE_QUEUED will be set as soon as there is
326                  * a buffer available.
327                  */
328                 if (ipipeif->output & IPIPEIF_OUTPUT_MEMORY &&
329                     !(video_out->dmaqueue_flags & ISS_VIDEO_DMAQUEUE_QUEUED))
330                         break;
331
332                 atomic_set(&ipipeif->stopping, 0);
333                 if (ipipeif->output & IPIPEIF_OUTPUT_MEMORY)
334                         ipipeif_write_enable(ipipeif, 1);
335                 ipipeif_enable(ipipeif, 1);
336                 iss_video_dmaqueue_flags_clr(video_out);
337                 break;
338
339         case ISS_PIPELINE_STREAM_STOPPED:
340                 if (ipipeif->state == ISS_PIPELINE_STREAM_STOPPED)
341                         return 0;
342                 if (omap4iss_module_sync_idle(&sd->entity, &ipipeif->wait,
343                                               &ipipeif->stopping))
344                         ret = -ETIMEDOUT;
345
346                 if (ipipeif->output & IPIPEIF_OUTPUT_MEMORY)
347                         ipipeif_write_enable(ipipeif, 0);
348                 ipipeif_enable(ipipeif, 0);
349                 omap4iss_isp_subclk_disable(iss, IPIPEIF_DRV_SUBCLK_MASK);
350                 iss_video_dmaqueue_flags_clr(video_out);
351                 break;
352         }
353
354         ipipeif->state = enable;
355         return ret;
356 }
357
358 static struct v4l2_mbus_framefmt *
359 __ipipeif_get_format(struct iss_ipipeif_device *ipipeif,
360                      struct v4l2_subdev_state *sd_state, unsigned int pad,
361                      enum v4l2_subdev_format_whence which)
362 {
363         if (which == V4L2_SUBDEV_FORMAT_TRY)
364                 return v4l2_subdev_state_get_format(sd_state, pad);
365         return &ipipeif->formats[pad];
366 }
367
368 /*
369  * ipipeif_try_format - Try video format on a pad
370  * @ipipeif: ISS IPIPEIF device
371  * @sd_state: V4L2 subdev state
372  * @pad: Pad number
373  * @fmt: Format
374  */
375 static void
376 ipipeif_try_format(struct iss_ipipeif_device *ipipeif,
377                    struct v4l2_subdev_state *sd_state, unsigned int pad,
378                    struct v4l2_mbus_framefmt *fmt,
379                    enum v4l2_subdev_format_whence which)
380 {
381         struct v4l2_mbus_framefmt *format;
382         unsigned int width = fmt->width;
383         unsigned int height = fmt->height;
384         unsigned int i;
385
386         switch (pad) {
387         case IPIPEIF_PAD_SINK:
388                 /* TODO: If the IPIPEIF output formatter pad is connected
389                  * directly to the resizer, only YUV formats can be used.
390                  */
391                 for (i = 0; i < ARRAY_SIZE(ipipeif_fmts); i++) {
392                         if (fmt->code == ipipeif_fmts[i])
393                                 break;
394                 }
395
396                 /* If not found, use SGRBG10 as default */
397                 if (i >= ARRAY_SIZE(ipipeif_fmts))
398                         fmt->code = MEDIA_BUS_FMT_SGRBG10_1X10;
399
400                 /* Clamp the input size. */
401                 fmt->width = clamp_t(u32, width, 1, 8192);
402                 fmt->height = clamp_t(u32, height, 1, 8192);
403                 break;
404
405         case IPIPEIF_PAD_SOURCE_ISIF_SF:
406                 format = __ipipeif_get_format(ipipeif, sd_state,
407                                               IPIPEIF_PAD_SINK,
408                                               which);
409                 memcpy(fmt, format, sizeof(*fmt));
410
411                 /* The data formatter truncates the number of horizontal output
412                  * pixels to a multiple of 16. To avoid clipping data, allow
413                  * callers to request an output size bigger than the input size
414                  * up to the nearest multiple of 16.
415                  */
416                 fmt->width = clamp_t(u32, width, 32, (fmt->width + 15) & ~15);
417                 fmt->width &= ~15;
418                 fmt->height = clamp_t(u32, height, 32, fmt->height);
419                 break;
420
421         case IPIPEIF_PAD_SOURCE_VP:
422                 format = __ipipeif_get_format(ipipeif, sd_state,
423                                               IPIPEIF_PAD_SINK,
424                                               which);
425                 memcpy(fmt, format, sizeof(*fmt));
426
427                 fmt->width = clamp_t(u32, width, 32, fmt->width);
428                 fmt->height = clamp_t(u32, height, 32, fmt->height);
429                 break;
430         }
431
432         /* Data is written to memory unpacked, each 10-bit or 12-bit pixel is
433          * stored on 2 bytes.
434          */
435         fmt->colorspace = V4L2_COLORSPACE_SRGB;
436         fmt->field = V4L2_FIELD_NONE;
437 }
438
439 /*
440  * ipipeif_enum_mbus_code - Handle pixel format enumeration
441  * @sd     : pointer to v4l2 subdev structure
442  * @sd_state: V4L2 subdev state
443  * @code   : pointer to v4l2_subdev_mbus_code_enum structure
444  * return -EINVAL or zero on success
445  */
446 static int ipipeif_enum_mbus_code(struct v4l2_subdev *sd,
447                                   struct v4l2_subdev_state *sd_state,
448                                   struct v4l2_subdev_mbus_code_enum *code)
449 {
450         struct iss_ipipeif_device *ipipeif = v4l2_get_subdevdata(sd);
451         struct v4l2_mbus_framefmt *format;
452
453         switch (code->pad) {
454         case IPIPEIF_PAD_SINK:
455                 if (code->index >= ARRAY_SIZE(ipipeif_fmts))
456                         return -EINVAL;
457
458                 code->code = ipipeif_fmts[code->index];
459                 break;
460
461         case IPIPEIF_PAD_SOURCE_ISIF_SF:
462         case IPIPEIF_PAD_SOURCE_VP:
463                 /* No format conversion inside IPIPEIF */
464                 if (code->index != 0)
465                         return -EINVAL;
466
467                 format = __ipipeif_get_format(ipipeif, sd_state,
468                                               IPIPEIF_PAD_SINK,
469                                               code->which);
470
471                 code->code = format->code;
472                 break;
473
474         default:
475                 return -EINVAL;
476         }
477
478         return 0;
479 }
480
481 static int ipipeif_enum_frame_size(struct v4l2_subdev *sd,
482                                    struct v4l2_subdev_state *sd_state,
483                                    struct v4l2_subdev_frame_size_enum *fse)
484 {
485         struct iss_ipipeif_device *ipipeif = v4l2_get_subdevdata(sd);
486         struct v4l2_mbus_framefmt format;
487
488         if (fse->index != 0)
489                 return -EINVAL;
490
491         format.code = fse->code;
492         format.width = 1;
493         format.height = 1;
494         ipipeif_try_format(ipipeif, sd_state, fse->pad, &format, fse->which);
495         fse->min_width = format.width;
496         fse->min_height = format.height;
497
498         if (format.code != fse->code)
499                 return -EINVAL;
500
501         format.code = fse->code;
502         format.width = -1;
503         format.height = -1;
504         ipipeif_try_format(ipipeif, sd_state, fse->pad, &format, fse->which);
505         fse->max_width = format.width;
506         fse->max_height = format.height;
507
508         return 0;
509 }
510
511 /*
512  * ipipeif_get_format - Retrieve the video format on a pad
513  * @sd : ISP IPIPEIF V4L2 subdevice
514  * @sd_state: V4L2 subdev state
515  * @fmt: Format
516  *
517  * Return 0 on success or -EINVAL if the pad is invalid or doesn't correspond
518  * to the format type.
519  */
520 static int ipipeif_get_format(struct v4l2_subdev *sd,
521                               struct v4l2_subdev_state *sd_state,
522                               struct v4l2_subdev_format *fmt)
523 {
524         struct iss_ipipeif_device *ipipeif = v4l2_get_subdevdata(sd);
525         struct v4l2_mbus_framefmt *format;
526
527         format = __ipipeif_get_format(ipipeif, sd_state, fmt->pad, fmt->which);
528         if (!format)
529                 return -EINVAL;
530
531         fmt->format = *format;
532         return 0;
533 }
534
535 /*
536  * ipipeif_set_format - Set the video format on a pad
537  * @sd : ISP IPIPEIF V4L2 subdevice
538  * @sd_state: V4L2 subdev state
539  * @fmt: Format
540  *
541  * Return 0 on success or -EINVAL if the pad is invalid or doesn't correspond
542  * to the format type.
543  */
544 static int ipipeif_set_format(struct v4l2_subdev *sd,
545                               struct v4l2_subdev_state *sd_state,
546                               struct v4l2_subdev_format *fmt)
547 {
548         struct iss_ipipeif_device *ipipeif = v4l2_get_subdevdata(sd);
549         struct v4l2_mbus_framefmt *format;
550
551         format = __ipipeif_get_format(ipipeif, sd_state, fmt->pad, fmt->which);
552         if (!format)
553                 return -EINVAL;
554
555         ipipeif_try_format(ipipeif, sd_state, fmt->pad, &fmt->format,
556                            fmt->which);
557         *format = fmt->format;
558
559         /* Propagate the format from sink to source */
560         if (fmt->pad == IPIPEIF_PAD_SINK) {
561                 format = __ipipeif_get_format(ipipeif, sd_state,
562                                               IPIPEIF_PAD_SOURCE_ISIF_SF,
563                                               fmt->which);
564                 *format = fmt->format;
565                 ipipeif_try_format(ipipeif, sd_state,
566                                    IPIPEIF_PAD_SOURCE_ISIF_SF,
567                                    format, fmt->which);
568
569                 format = __ipipeif_get_format(ipipeif, sd_state,
570                                               IPIPEIF_PAD_SOURCE_VP,
571                                               fmt->which);
572                 *format = fmt->format;
573                 ipipeif_try_format(ipipeif, sd_state, IPIPEIF_PAD_SOURCE_VP,
574                                    format,
575                                    fmt->which);
576         }
577
578         return 0;
579 }
580
581 static int ipipeif_link_validate(struct v4l2_subdev *sd,
582                                  struct media_link *link,
583                                  struct v4l2_subdev_format *source_fmt,
584                                  struct v4l2_subdev_format *sink_fmt)
585 {
586         /* Check if the two ends match */
587         if (source_fmt->format.width != sink_fmt->format.width ||
588             source_fmt->format.height != sink_fmt->format.height)
589                 return -EPIPE;
590
591         if (source_fmt->format.code != sink_fmt->format.code)
592                 return -EPIPE;
593
594         return 0;
595 }
596
597 /*
598  * ipipeif_init_formats - Initialize formats on all pads
599  * @sd: ISP IPIPEIF V4L2 subdevice
600  * @fh: V4L2 subdev file handle
601  *
602  * Initialize all pad formats with default values. If fh is not NULL, try
603  * formats are initialized on the file handle. Otherwise active formats are
604  * initialized on the device.
605  */
606 static int ipipeif_init_formats(struct v4l2_subdev *sd,
607                                 struct v4l2_subdev_fh *fh)
608 {
609         struct v4l2_subdev_format format;
610
611         memset(&format, 0, sizeof(format));
612         format.pad = IPIPEIF_PAD_SINK;
613         format.which = fh ? V4L2_SUBDEV_FORMAT_TRY : V4L2_SUBDEV_FORMAT_ACTIVE;
614         format.format.code = MEDIA_BUS_FMT_SGRBG10_1X10;
615         format.format.width = 4096;
616         format.format.height = 4096;
617         ipipeif_set_format(sd, fh ? fh->state : NULL, &format);
618
619         return 0;
620 }
621
622 /* V4L2 subdev video operations */
623 static const struct v4l2_subdev_video_ops ipipeif_v4l2_video_ops = {
624         .s_stream = ipipeif_set_stream,
625 };
626
627 /* V4L2 subdev pad operations */
628 static const struct v4l2_subdev_pad_ops ipipeif_v4l2_pad_ops = {
629         .enum_mbus_code = ipipeif_enum_mbus_code,
630         .enum_frame_size = ipipeif_enum_frame_size,
631         .get_fmt = ipipeif_get_format,
632         .set_fmt = ipipeif_set_format,
633         .link_validate = ipipeif_link_validate,
634 };
635
636 /* V4L2 subdev operations */
637 static const struct v4l2_subdev_ops ipipeif_v4l2_ops = {
638         .video = &ipipeif_v4l2_video_ops,
639         .pad = &ipipeif_v4l2_pad_ops,
640 };
641
642 /* V4L2 subdev internal operations */
643 static const struct v4l2_subdev_internal_ops ipipeif_v4l2_internal_ops = {
644         .open = ipipeif_init_formats,
645 };
646
647 /* -----------------------------------------------------------------------------
648  * Media entity operations
649  */
650
651 /*
652  * ipipeif_link_setup - Setup IPIPEIF connections
653  * @entity: IPIPEIF media entity
654  * @local: Pad at the local end of the link
655  * @remote: Pad at the remote end of the link
656  * @flags: Link flags
657  *
658  * return -EINVAL or zero on success
659  */
660 static int ipipeif_link_setup(struct media_entity *entity,
661                               const struct media_pad *local,
662                               const struct media_pad *remote, u32 flags)
663 {
664         struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
665         struct iss_ipipeif_device *ipipeif = v4l2_get_subdevdata(sd);
666         struct iss_device *iss = to_iss_device(ipipeif);
667         unsigned int index = local->index;
668
669         /* FIXME: this is actually a hack! */
670         if (is_media_entity_v4l2_subdev(remote->entity))
671                 index |= 2 << 16;
672
673         switch (index) {
674         case IPIPEIF_PAD_SINK | 2 << 16:
675                 /* Read from the sensor CSI2a or CSI2b. */
676                 if (!(flags & MEDIA_LNK_FL_ENABLED)) {
677                         ipipeif->input = IPIPEIF_INPUT_NONE;
678                         break;
679                 }
680
681                 if (ipipeif->input != IPIPEIF_INPUT_NONE)
682                         return -EBUSY;
683
684                 if (remote->entity == &iss->csi2a.subdev.entity)
685                         ipipeif->input = IPIPEIF_INPUT_CSI2A;
686                 else if (remote->entity == &iss->csi2b.subdev.entity)
687                         ipipeif->input = IPIPEIF_INPUT_CSI2B;
688
689                 break;
690
691         case IPIPEIF_PAD_SOURCE_ISIF_SF:
692                 /* Write to memory */
693                 if (flags & MEDIA_LNK_FL_ENABLED) {
694                         if (ipipeif->output & ~IPIPEIF_OUTPUT_MEMORY)
695                                 return -EBUSY;
696                         ipipeif->output |= IPIPEIF_OUTPUT_MEMORY;
697                 } else {
698                         ipipeif->output &= ~IPIPEIF_OUTPUT_MEMORY;
699                 }
700                 break;
701
702         case IPIPEIF_PAD_SOURCE_VP | 2 << 16:
703                 /* Send to IPIPE/RESIZER */
704                 if (flags & MEDIA_LNK_FL_ENABLED) {
705                         if (ipipeif->output & ~IPIPEIF_OUTPUT_VP)
706                                 return -EBUSY;
707                         ipipeif->output |= IPIPEIF_OUTPUT_VP;
708                 } else {
709                         ipipeif->output &= ~IPIPEIF_OUTPUT_VP;
710                 }
711                 break;
712
713         default:
714                 return -EINVAL;
715         }
716
717         return 0;
718 }
719
720 /* media operations */
721 static const struct media_entity_operations ipipeif_media_ops = {
722         .link_setup = ipipeif_link_setup,
723         .link_validate = v4l2_subdev_link_validate,
724 };
725
726 /*
727  * ipipeif_init_entities - Initialize V4L2 subdev and media entity
728  * @ipipeif: ISS ISP IPIPEIF module
729  *
730  * Return 0 on success and a negative error code on failure.
731  */
732 static int ipipeif_init_entities(struct iss_ipipeif_device *ipipeif)
733 {
734         struct v4l2_subdev *sd = &ipipeif->subdev;
735         struct media_pad *pads = ipipeif->pads;
736         struct media_entity *me = &sd->entity;
737         int ret;
738
739         ipipeif->input = IPIPEIF_INPUT_NONE;
740
741         v4l2_subdev_init(sd, &ipipeif_v4l2_ops);
742         sd->internal_ops = &ipipeif_v4l2_internal_ops;
743         strscpy(sd->name, "OMAP4 ISS ISP IPIPEIF", sizeof(sd->name));
744         sd->grp_id = BIT(16);   /* group ID for iss subdevs */
745         v4l2_set_subdevdata(sd, ipipeif);
746         sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
747
748         pads[IPIPEIF_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
749         pads[IPIPEIF_PAD_SOURCE_ISIF_SF].flags = MEDIA_PAD_FL_SOURCE;
750         pads[IPIPEIF_PAD_SOURCE_VP].flags = MEDIA_PAD_FL_SOURCE;
751
752         me->ops = &ipipeif_media_ops;
753         ret = media_entity_pads_init(me, IPIPEIF_PADS_NUM, pads);
754         if (ret < 0)
755                 return ret;
756
757         ipipeif_init_formats(sd, NULL);
758
759         ipipeif->video_out.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
760         ipipeif->video_out.ops = &ipipeif_video_ops;
761         ipipeif->video_out.iss = to_iss_device(ipipeif);
762         ipipeif->video_out.capture_mem = PAGE_ALIGN(4096 * 4096) * 3;
763         ipipeif->video_out.bpl_alignment = 32;
764         ipipeif->video_out.bpl_zero_padding = 1;
765         ipipeif->video_out.bpl_max = 0x1ffe0;
766
767         return omap4iss_video_init(&ipipeif->video_out, "ISP IPIPEIF");
768 }
769
770 void omap4iss_ipipeif_unregister_entities(struct iss_ipipeif_device *ipipeif)
771 {
772         v4l2_device_unregister_subdev(&ipipeif->subdev);
773         omap4iss_video_unregister(&ipipeif->video_out);
774 }
775
776 int omap4iss_ipipeif_register_entities(struct iss_ipipeif_device *ipipeif,
777                                        struct v4l2_device *vdev)
778 {
779         int ret;
780
781         /* Register the subdev and video node. */
782         ret = v4l2_device_register_subdev(vdev, &ipipeif->subdev);
783         if (ret < 0)
784                 goto error;
785
786         ret = omap4iss_video_register(&ipipeif->video_out, vdev);
787         if (ret < 0)
788                 goto error;
789
790         return 0;
791
792 error:
793         omap4iss_ipipeif_unregister_entities(ipipeif);
794         return ret;
795 }
796
797 /* -----------------------------------------------------------------------------
798  * ISP IPIPEIF initialisation and cleanup
799  */
800
801 /*
802  * omap4iss_ipipeif_init - IPIPEIF module initialization.
803  * @iss: Device pointer specific to the OMAP4 ISS.
804  *
805  * TODO: Get the initialisation values from platform data.
806  *
807  * Return 0 on success or a negative error code otherwise.
808  */
809 int omap4iss_ipipeif_init(struct iss_device *iss)
810 {
811         struct iss_ipipeif_device *ipipeif = &iss->ipipeif;
812
813         ipipeif->state = ISS_PIPELINE_STREAM_STOPPED;
814         init_waitqueue_head(&ipipeif->wait);
815
816         return ipipeif_init_entities(ipipeif);
817 }
818
819 /*
820  * omap4iss_ipipeif_create_links() - IPIPEIF pads links creation
821  * @iss: Pointer to ISS device
822  *
823  * return negative error code or zero on success
824  */
825 int omap4iss_ipipeif_create_links(struct iss_device *iss)
826 {
827         struct iss_ipipeif_device *ipipeif = &iss->ipipeif;
828
829         /* Connect the IPIPEIF subdev to the video node. */
830         return media_create_pad_link(&ipipeif->subdev.entity,
831                                      IPIPEIF_PAD_SOURCE_ISIF_SF,
832                                      &ipipeif->video_out.video.entity, 0, 0);
833 }
834
835 /*
836  * omap4iss_ipipeif_cleanup - IPIPEIF module cleanup.
837  * @iss: Device pointer specific to the OMAP4 ISS.
838  */
839 void omap4iss_ipipeif_cleanup(struct iss_device *iss)
840 {
841         struct iss_ipipeif_device *ipipeif = &iss->ipipeif;
842
843         media_entity_cleanup(&ipipeif->subdev.entity);
844 }