drivers/staging/media/omap4iss/iss_resizer.c

   1 /*
   2  * TI OMAP4 ISS V4L2 Driver - ISP RESIZER module
   3  *
   4  * Copyright (C) 2012 Texas Instruments, Inc.
   5  *
   6  * Author: Sergio Aguirre <sergio.a.aguirre@gmail.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 by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/uaccess.h>
  16 #include <linux/delay.h>
  17 #include <linux/device.h>
  18 #include <linux/dma-mapping.h>
  19 #include <linux/mm.h>
  20 #include <linux/sched.h>
  21
  22 #include "iss.h"
  23 #include "iss_regs.h"
  24 #include "iss_resizer.h"
  25
  26 static const unsigned int resizer_fmts[] = {
  27         MEDIA_BUS_FMT_UYVY8_1X16,
  28         MEDIA_BUS_FMT_YUYV8_1X16,
  29 };
  30
  31 /*
  32  * resizer_print_status - Print current RESIZER Module register values.
  33  * @resizer: Pointer to ISS ISP RESIZER device.
  34  *
  35  * Also prints other debug information stored in the RESIZER module.
  36  */
  37 #define RSZ_PRINT_REGISTER(iss, name)\
  38         dev_dbg(iss->dev, "###RSZ " #name "=0x%08x\n", \
  39                 iss_reg_read(iss, OMAP4_ISS_MEM_ISP_RESIZER, RSZ_##name))
  40
  41 #define RZA_PRINT_REGISTER(iss, name)\
  42         dev_dbg(iss->dev, "###RZA " #name "=0x%08x\n", \
  43                 iss_reg_read(iss, OMAP4_ISS_MEM_ISP_RESIZER, RZA_##name))
  44
  45 static void resizer_print_status(struct iss_resizer_device *resizer)
  46 {
  47         struct iss_device *iss = to_iss_device(resizer);
  48
  49         dev_dbg(iss->dev, "-------------RESIZER Register dump-------------\n");
  50
  51         RSZ_PRINT_REGISTER(iss, SYSCONFIG);
  52         RSZ_PRINT_REGISTER(iss, IN_FIFO_CTRL);
  53         RSZ_PRINT_REGISTER(iss, FRACDIV);
  54         RSZ_PRINT_REGISTER(iss, SRC_EN);
  55         RSZ_PRINT_REGISTER(iss, SRC_MODE);
  56         RSZ_PRINT_REGISTER(iss, SRC_FMT0);
  57         RSZ_PRINT_REGISTER(iss, SRC_FMT1);
  58         RSZ_PRINT_REGISTER(iss, SRC_VPS);
  59         RSZ_PRINT_REGISTER(iss, SRC_VSZ);
  60         RSZ_PRINT_REGISTER(iss, SRC_HPS);
  61         RSZ_PRINT_REGISTER(iss, SRC_HSZ);
  62         RSZ_PRINT_REGISTER(iss, DMA_RZA);
  63         RSZ_PRINT_REGISTER(iss, DMA_RZB);
  64         RSZ_PRINT_REGISTER(iss, DMA_STA);
  65         RSZ_PRINT_REGISTER(iss, GCK_MMR);
  66         RSZ_PRINT_REGISTER(iss, GCK_SDR);
  67         RSZ_PRINT_REGISTER(iss, IRQ_RZA);
  68         RSZ_PRINT_REGISTER(iss, IRQ_RZB);
  69         RSZ_PRINT_REGISTER(iss, YUV_Y_MIN);
  70         RSZ_PRINT_REGISTER(iss, YUV_Y_MAX);
  71         RSZ_PRINT_REGISTER(iss, YUV_C_MIN);
  72         RSZ_PRINT_REGISTER(iss, YUV_C_MAX);
  73         RSZ_PRINT_REGISTER(iss, SEQ);
  74
  75         RZA_PRINT_REGISTER(iss, EN);
  76         RZA_PRINT_REGISTER(iss, MODE);
  77         RZA_PRINT_REGISTER(iss, 420);
  78         RZA_PRINT_REGISTER(iss, I_VPS);
  79         RZA_PRINT_REGISTER(iss, I_HPS);
  80         RZA_PRINT_REGISTER(iss, O_VSZ);
  81         RZA_PRINT_REGISTER(iss, O_HSZ);
  82         RZA_PRINT_REGISTER(iss, V_PHS_Y);
  83         RZA_PRINT_REGISTER(iss, V_PHS_C);
  84         RZA_PRINT_REGISTER(iss, V_DIF);
  85         RZA_PRINT_REGISTER(iss, V_TYP);
  86         RZA_PRINT_REGISTER(iss, V_LPF);
  87         RZA_PRINT_REGISTER(iss, H_PHS);
  88         RZA_PRINT_REGISTER(iss, H_DIF);
  89         RZA_PRINT_REGISTER(iss, H_TYP);
  90         RZA_PRINT_REGISTER(iss, H_LPF);
  91         RZA_PRINT_REGISTER(iss, DWN_EN);
  92         RZA_PRINT_REGISTER(iss, SDR_Y_BAD_H);
  93         RZA_PRINT_REGISTER(iss, SDR_Y_BAD_L);
  94         RZA_PRINT_REGISTER(iss, SDR_Y_SAD_H);
  95         RZA_PRINT_REGISTER(iss, SDR_Y_SAD_L);
  96         RZA_PRINT_REGISTER(iss, SDR_Y_OFT);
  97         RZA_PRINT_REGISTER(iss, SDR_Y_PTR_S);
  98         RZA_PRINT_REGISTER(iss, SDR_Y_PTR_E);
  99         RZA_PRINT_REGISTER(iss, SDR_C_BAD_H);
 100         RZA_PRINT_REGISTER(iss, SDR_C_BAD_L);
 101         RZA_PRINT_REGISTER(iss, SDR_C_SAD_H);
 102         RZA_PRINT_REGISTER(iss, SDR_C_SAD_L);
 103         RZA_PRINT_REGISTER(iss, SDR_C_OFT);
 104         RZA_PRINT_REGISTER(iss, SDR_C_PTR_S);
 105         RZA_PRINT_REGISTER(iss, SDR_C_PTR_E);
 106
 107         dev_dbg(iss->dev, "-----------------------------------------------\n");
 108 }
 109
 110 /*
 111  * resizer_enable - Enable/Disable RESIZER.
 112  * @enable: enable flag
 113  *
 114  */
 115 static void resizer_enable(struct iss_resizer_device *resizer, u8 enable)
 116 {
 117         struct iss_device *iss = to_iss_device(resizer);
 118
 119         iss_reg_update(iss, OMAP4_ISS_MEM_ISP_RESIZER, RSZ_SRC_EN,
 120                        RSZ_SRC_EN_SRC_EN, enable ? RSZ_SRC_EN_SRC_EN : 0);
 121
 122         /* TODO: Enable RSZB */
 123         iss_reg_update(iss, OMAP4_ISS_MEM_ISP_RESIZER, RZA_EN, RSZ_EN_EN,
 124                        enable ? RSZ_EN_EN : 0);
 125 }
 126
 127 /* -----------------------------------------------------------------------------
 128  * Format- and pipeline-related configuration helpers
 129  */
 130
 131 /*
 132  * resizer_set_outaddr - Set memory address to save output image
 133  * @resizer: Pointer to ISP RESIZER device.
 134  * @addr: 32-bit memory address aligned on 32 byte boundary.
 135  *
 136  * Sets the memory address where the output will be saved.
 137  */
 138 static void resizer_set_outaddr(struct iss_resizer_device *resizer, u32 addr)
 139 {
 140         struct iss_device *iss = to_iss_device(resizer);
 141         struct v4l2_mbus_framefmt *informat, *outformat;
 142
 143         informat = &resizer->formats[RESIZER_PAD_SINK];
 144         outformat = &resizer->formats[RESIZER_PAD_SOURCE_MEM];
 145
 146         /* Save address split in Base Address H & L */
 147         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_RESIZER, RZA_SDR_Y_BAD_H,
 148                       (addr >> 16) & 0xffff);
 149         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_RESIZER, RZA_SDR_Y_BAD_L,
 150                       addr & 0xffff);
 151
 152         /* SAD = BAD */
 153         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_RESIZER, RZA_SDR_Y_SAD_H,
 154                       (addr >> 16) & 0xffff);
 155         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_RESIZER, RZA_SDR_Y_SAD_L,
 156                       addr & 0xffff);
 157
 158         /* Program UV buffer address... Hardcoded to be contiguous! */
 159         if ((informat->code == MEDIA_BUS_FMT_UYVY8_1X16) &&
 160             (outformat->code == MEDIA_BUS_FMT_YUYV8_1_5X8)) {
 161                 u32 c_addr = addr + resizer->video_out.bpl_value
 162                            * outformat->height;
 163
 164                 /* Ensure Y_BAD_L[6:0] = C_BAD_L[6:0]*/
 165                 if ((c_addr ^ addr) & 0x7f) {
 166                         c_addr &= ~0x7f;
 167                         c_addr += 0x80;
 168                         c_addr |= addr & 0x7f;
 169                 }
 170
 171                 /* Save address split in Base Address H & L */
 172                 iss_reg_write(iss, OMAP4_ISS_MEM_ISP_RESIZER, RZA_SDR_C_BAD_H,
 173                               (c_addr >> 16) & 0xffff);
 174                 iss_reg_write(iss, OMAP4_ISS_MEM_ISP_RESIZER, RZA_SDR_C_BAD_L,
 175                               c_addr & 0xffff);
 176
 177                 /* SAD = BAD */
 178                 iss_reg_write(iss, OMAP4_ISS_MEM_ISP_RESIZER, RZA_SDR_C_SAD_H,
 179                               (c_addr >> 16) & 0xffff);
 180                 iss_reg_write(iss, OMAP4_ISS_MEM_ISP_RESIZER, RZA_SDR_C_SAD_L,
 181                               c_addr & 0xffff);
 182         }
 183 }
 184
 185 static void resizer_configure(struct iss_resizer_device *resizer)
 186 {
 187         struct iss_device *iss = to_iss_device(resizer);
 188         struct v4l2_mbus_framefmt *informat, *outformat;
 189
 190         informat = &resizer->formats[RESIZER_PAD_SINK];
 191         outformat = &resizer->formats[RESIZER_PAD_SOURCE_MEM];
 192
 193         /* Disable pass-through more. Despite its name, the BYPASS bit controls
 194          * pass-through mode, not bypass mode.
 195          */
 196         iss_reg_clr(iss, OMAP4_ISS_MEM_ISP_RESIZER, RSZ_SRC_FMT0,
 197                     RSZ_SRC_FMT0_BYPASS);
 198
 199         /* Select RSZ input */
 200         iss_reg_update(iss, OMAP4_ISS_MEM_ISP_RESIZER, RSZ_SRC_FMT0,
 201                        RSZ_SRC_FMT0_SEL,
 202                        resizer->input == RESIZER_INPUT_IPIPEIF ?
 203                        RSZ_SRC_FMT0_SEL : 0);
 204
 205         /* RSZ ignores WEN signal from IPIPE/IPIPEIF */
 206         iss_reg_clr(iss, OMAP4_ISS_MEM_ISP_RESIZER, RSZ_SRC_MODE,
 207                     RSZ_SRC_MODE_WRT);
 208
 209         /* Set Resizer in free-running mode */
 210         iss_reg_clr(iss, OMAP4_ISS_MEM_ISP_RESIZER, RSZ_SRC_MODE,
 211                     RSZ_SRC_MODE_OST);
 212
 213         /* Init Resizer A */
 214         iss_reg_clr(iss, OMAP4_ISS_MEM_ISP_RESIZER, RZA_MODE,
 215                     RZA_MODE_ONE_SHOT);
 216
 217         /* Set size related things now */
 218         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_RESIZER, RSZ_SRC_VPS, 0);
 219         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_RESIZER, RSZ_SRC_HPS, 0);
 220         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_RESIZER, RSZ_SRC_VSZ,
 221                       informat->height - 2);
 222         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_RESIZER, RSZ_SRC_HSZ,
 223                       informat->width - 1);
 224
 225         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_RESIZER, RZA_I_VPS, 0);
 226         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_RESIZER, RZA_I_HPS, 0);
 227
 228         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_RESIZER, RZA_O_VSZ,
 229                       outformat->height - 2);
 230         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_RESIZER, RZA_O_HSZ,
 231                       outformat->width - 1);
 232
 233         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_RESIZER, RZA_V_DIF, 0x100);
 234         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_RESIZER, RZA_H_DIF, 0x100);
 235
 236         /* Buffer output settings */
 237         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_RESIZER, RZA_SDR_Y_PTR_S, 0);
 238         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_RESIZER, RZA_SDR_Y_PTR_E,
 239                       outformat->height - 1);
 240
 241         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_RESIZER, RZA_SDR_Y_OFT,
 242                       resizer->video_out.bpl_value);
 243
 244         /* UYVY -> NV12 conversion */
 245         if ((informat->code == MEDIA_BUS_FMT_UYVY8_1X16) &&
 246             (outformat->code == MEDIA_BUS_FMT_YUYV8_1_5X8)) {
 247                 iss_reg_write(iss, OMAP4_ISS_MEM_ISP_RESIZER, RZA_420,
 248                               RSZ_420_CEN | RSZ_420_YEN);
 249
 250                 /* UV Buffer output settings */
 251                 iss_reg_write(iss, OMAP4_ISS_MEM_ISP_RESIZER, RZA_SDR_C_PTR_S,
 252                               0);
 253                 iss_reg_write(iss, OMAP4_ISS_MEM_ISP_RESIZER, RZA_SDR_C_PTR_E,
 254                               outformat->height - 1);
 255
 256                 iss_reg_write(iss, OMAP4_ISS_MEM_ISP_RESIZER, RZA_SDR_C_OFT,
 257                               resizer->video_out.bpl_value);
 258         } else {
 259                 iss_reg_write(iss, OMAP4_ISS_MEM_ISP_RESIZER, RZA_420, 0);
 260         }
 261 }
 262
 263 /* -----------------------------------------------------------------------------
 264  * Interrupt handling
 265  */
 266
 267 static void resizer_isr_buffer(struct iss_resizer_device *resizer)
 268 {
 269         struct iss_buffer *buffer;
 270
 271         /* The whole resizer needs to be stopped. Disabling RZA only produces
 272          * input FIFO overflows, most probably when the next frame is received.
 273          */
 274         resizer_enable(resizer, 0);
 275
 276         buffer = omap4iss_video_buffer_next(&resizer->video_out);
 277         if (!buffer)
 278                 return;
 279
 280         resizer_set_outaddr(resizer, buffer->iss_addr);
 281
 282         resizer_enable(resizer, 1);
 283 }
 284
 285 /*
 286  * omap4iss_resizer_isr - Configure resizer during interframe time.
 287  * @resizer: Pointer to ISP RESIZER device.
 288  * @events: RESIZER events
 289  */
 290 void omap4iss_resizer_isr(struct iss_resizer_device *resizer, u32 events)
 291 {
 292         struct iss_device *iss = to_iss_device(resizer);
 293         struct iss_pipeline *pipe =
 294                              to_iss_pipeline(&resizer->subdev.entity);
 295
 296         if (events & (ISP5_IRQ_RSZ_FIFO_IN_BLK_ERR |
 297                       ISP5_IRQ_RSZ_FIFO_OVF)) {
 298                 dev_dbg(iss->dev, "RSZ Err: FIFO_IN_BLK:%d, FIFO_OVF:%d\n",
 299                         events & ISP5_IRQ_RSZ_FIFO_IN_BLK_ERR ? 1 : 0,
 300                         events & ISP5_IRQ_RSZ_FIFO_OVF ? 1 : 0);
 301                 omap4iss_pipeline_cancel_stream(pipe);
 302         }
 303
 304         if (omap4iss_module_sync_is_stopping(&resizer->wait,
 305                                              &resizer->stopping))
 306                 return;
 307
 308         if (events & ISP5_IRQ_RSZ_INT_DMA)
 309                 resizer_isr_buffer(resizer);
 310 }
 311
 312 /* -----------------------------------------------------------------------------
 313  * ISS video operations
 314  */
 315
 316 static int resizer_video_queue(struct iss_video *video,
 317                                struct iss_buffer *buffer)
 318 {
 319         struct iss_resizer_device *resizer = container_of(video,
 320                                 struct iss_resizer_device, video_out);
 321
 322         if (!(resizer->output & RESIZER_OUTPUT_MEMORY))
 323                 return -ENODEV;
 324
 325         resizer_set_outaddr(resizer, buffer->iss_addr);
 326
 327         /*
 328          * If streaming was enabled before there was a buffer queued
 329          * or underrun happened in the ISR, the hardware was not enabled
 330          * and DMA queue flag ISS_VIDEO_DMAQUEUE_UNDERRUN is still set.
 331          * Enable it now.
 332          */
 333         if (video->dmaqueue_flags & ISS_VIDEO_DMAQUEUE_UNDERRUN) {
 334                 resizer_enable(resizer, 1);
 335                 iss_video_dmaqueue_flags_clr(video);
 336         }
 337
 338         return 0;
 339 }
 340
 341 static const struct iss_video_operations resizer_video_ops = {
 342         .queue = resizer_video_queue,
 343 };
 344
 345 /* -----------------------------------------------------------------------------
 346  * V4L2 subdev operations
 347  */
 348
 349 /*
 350  * resizer_set_stream - Enable/Disable streaming on the RESIZER module
 351  * @sd: ISP RESIZER V4L2 subdevice
 352  * @enable: Enable/disable stream
 353  */
 354 static int resizer_set_stream(struct v4l2_subdev *sd, int enable)
 355 {
 356         struct iss_resizer_device *resizer = v4l2_get_subdevdata(sd);
 357         struct iss_device *iss = to_iss_device(resizer);
 358         struct iss_video *video_out = &resizer->video_out;
 359         int ret = 0;
 360
 361         if (resizer->state == ISS_PIPELINE_STREAM_STOPPED) {
 362                 if (enable == ISS_PIPELINE_STREAM_STOPPED)
 363                         return 0;
 364
 365                 omap4iss_isp_subclk_enable(iss, OMAP4_ISS_ISP_SUBCLK_RSZ);
 366
 367                 iss_reg_set(iss, OMAP4_ISS_MEM_ISP_RESIZER, RSZ_GCK_MMR,
 368                             RSZ_GCK_MMR_MMR);
 369                 iss_reg_set(iss, OMAP4_ISS_MEM_ISP_RESIZER, RSZ_GCK_SDR,
 370                             RSZ_GCK_SDR_CORE);
 371
 372                 /* FIXME: Enable RSZB also */
 373                 iss_reg_set(iss, OMAP4_ISS_MEM_ISP_RESIZER, RSZ_SYSCONFIG,
 374                             RSZ_SYSCONFIG_RSZA_CLK_EN);
 375         }
 376
 377         switch (enable) {
 378         case ISS_PIPELINE_STREAM_CONTINUOUS:
 379
 380                 resizer_configure(resizer);
 381                 resizer_print_status(resizer);
 382
 383                 /*
 384                  * When outputting to memory with no buffer available, let the
 385                  * buffer queue handler start the hardware. A DMA queue flag
 386                  * ISS_VIDEO_DMAQUEUE_QUEUED will be set as soon as there is
 387                  * a buffer available.
 388                  */
 389                 if (resizer->output & RESIZER_OUTPUT_MEMORY &&
 390                     !(video_out->dmaqueue_flags & ISS_VIDEO_DMAQUEUE_QUEUED))
 391                         break;
 392
 393                 atomic_set(&resizer->stopping, 0);
 394                 resizer_enable(resizer, 1);
 395                 iss_video_dmaqueue_flags_clr(video_out);
 396                 break;
 397
 398         case ISS_PIPELINE_STREAM_STOPPED:
 399                 if (resizer->state == ISS_PIPELINE_STREAM_STOPPED)
 400                         return 0;
 401                 if (omap4iss_module_sync_idle(&sd->entity, &resizer->wait,
 402                                               &resizer->stopping))
 403                         ret = -ETIMEDOUT;
 404
 405                 resizer_enable(resizer, 0);
 406                 iss_reg_clr(iss, OMAP4_ISS_MEM_ISP_RESIZER, RSZ_SYSCONFIG,
 407                             RSZ_SYSCONFIG_RSZA_CLK_EN);
 408                 iss_reg_clr(iss, OMAP4_ISS_MEM_ISP_RESIZER, RSZ_GCK_SDR,
 409                             RSZ_GCK_SDR_CORE);
 410                 iss_reg_clr(iss, OMAP4_ISS_MEM_ISP_RESIZER, RSZ_GCK_MMR,
 411                             RSZ_GCK_MMR_MMR);
 412                 omap4iss_isp_subclk_disable(iss, OMAP4_ISS_ISP_SUBCLK_RSZ);
 413                 iss_video_dmaqueue_flags_clr(video_out);
 414                 break;
 415         }
 416
 417         resizer->state = enable;
 418         return ret;
 419 }
 420
 421 static struct v4l2_mbus_framefmt *
 422 __resizer_get_format(struct iss_resizer_device *resizer,
 423                      struct v4l2_subdev_pad_config *cfg, unsigned int pad,
 424                      enum v4l2_subdev_format_whence which)
 425 {
 426         if (which == V4L2_SUBDEV_FORMAT_TRY)
 427                 return v4l2_subdev_get_try_format(&resizer->subdev, cfg, pad);
 428         return &resizer->formats[pad];
 429 }
 430
 431 /*
 432  * resizer_try_format - Try video format on a pad
 433  * @resizer: ISS RESIZER device
 434  * @cfg: V4L2 subdev pad config
 435  * @pad: Pad number
 436  * @fmt: Format
 437  */
 438 static void
 439 resizer_try_format(struct iss_resizer_device *resizer,
 440                    struct v4l2_subdev_pad_config *cfg, unsigned int pad,
 441                    struct v4l2_mbus_framefmt *fmt,
 442                    enum v4l2_subdev_format_whence which)
 443 {
 444         u32 pixelcode;
 445         struct v4l2_mbus_framefmt *format;
 446         unsigned int width = fmt->width;
 447         unsigned int height = fmt->height;
 448         unsigned int i;
 449
 450         switch (pad) {
 451         case RESIZER_PAD_SINK:
 452                 for (i = 0; i < ARRAY_SIZE(resizer_fmts); i++) {
 453                         if (fmt->code == resizer_fmts[i])
 454                                 break;
 455                 }
 456
 457                 /* If not found, use UYVY as default */
 458                 if (i >= ARRAY_SIZE(resizer_fmts))
 459                         fmt->code = MEDIA_BUS_FMT_UYVY8_1X16;
 460
 461                 /* Clamp the input size. */
 462                 fmt->width = clamp_t(u32, width, 1, 8192);
 463                 fmt->height = clamp_t(u32, height, 1, 8192);
 464                 break;
 465
 466         case RESIZER_PAD_SOURCE_MEM:
 467                 pixelcode = fmt->code;
 468                 format = __resizer_get_format(resizer, cfg, RESIZER_PAD_SINK,
 469                                               which);
 470                 memcpy(fmt, format, sizeof(*fmt));
 471
 472                 if ((pixelcode == MEDIA_BUS_FMT_YUYV8_1_5X8) &&
 473                     (fmt->code == MEDIA_BUS_FMT_UYVY8_1X16))
 474                         fmt->code = pixelcode;
 475
 476                 /* The data formatter truncates the number of horizontal output
 477                  * pixels to a multiple of 16. To avoid clipping data, allow
 478                  * callers to request an output size bigger than the input size
 479                  * up to the nearest multiple of 16.
 480                  */
 481                 fmt->width = clamp_t(u32, width, 32, (fmt->width + 15) & ~15);
 482                 fmt->width &= ~15;
 483                 fmt->height = clamp_t(u32, height, 32, fmt->height);
 484                 break;
 485         }
 486
 487         fmt->colorspace = V4L2_COLORSPACE_JPEG;
 488         fmt->field = V4L2_FIELD_NONE;
 489 }
 490
 491 /*
 492  * resizer_enum_mbus_code - Handle pixel format enumeration
 493  * @sd     : pointer to v4l2 subdev structure
 494  * @cfg: V4L2 subdev pad config
 495  * @code   : pointer to v4l2_subdev_mbus_code_enum structure
 496  * return -EINVAL or zero on success
 497  */
 498 static int resizer_enum_mbus_code(struct v4l2_subdev *sd,
 499                                   struct v4l2_subdev_pad_config *cfg,
 500                                   struct v4l2_subdev_mbus_code_enum *code)
 501 {
 502         struct iss_resizer_device *resizer = v4l2_get_subdevdata(sd);
 503         struct v4l2_mbus_framefmt *format;
 504
 505         switch (code->pad) {
 506         case RESIZER_PAD_SINK:
 507                 if (code->index >= ARRAY_SIZE(resizer_fmts))
 508                         return -EINVAL;
 509
 510                 code->code = resizer_fmts[code->index];
 511                 break;
 512
 513         case RESIZER_PAD_SOURCE_MEM:
 514                 format = __resizer_get_format(resizer, cfg, RESIZER_PAD_SINK,
 515                                               code->which);
 516
 517                 if (code->index == 0) {
 518                         code->code = format->code;
 519                         break;
 520                 }
 521
 522                 switch (format->code) {
 523                 case MEDIA_BUS_FMT_UYVY8_1X16:
 524                         if (code->index == 1)
 525                                 code->code = MEDIA_BUS_FMT_YUYV8_1_5X8;
 526                         else
 527                                 return -EINVAL;
 528                         break;
 529                 default:
 530                         if (code->index != 0)
 531                                 return -EINVAL;
 532                 }
 533
 534                 break;
 535
 536         default:
 537                 return -EINVAL;
 538         }
 539
 540         return 0;
 541 }
 542
 543 static int resizer_enum_frame_size(struct v4l2_subdev *sd,
 544                                    struct v4l2_subdev_pad_config *cfg,
 545                                    struct v4l2_subdev_frame_size_enum *fse)
 546 {
 547         struct iss_resizer_device *resizer = v4l2_get_subdevdata(sd);
 548         struct v4l2_mbus_framefmt format;
 549
 550         if (fse->index != 0)
 551                 return -EINVAL;
 552
 553         format.code = fse->code;
 554         format.width = 1;
 555         format.height = 1;
 556         resizer_try_format(resizer, cfg, fse->pad, &format, fse->which);
 557         fse->min_width = format.width;
 558         fse->min_height = format.height;
 559
 560         if (format.code != fse->code)
 561                 return -EINVAL;
 562
 563         format.code = fse->code;
 564         format.width = -1;
 565         format.height = -1;
 566         resizer_try_format(resizer, cfg, fse->pad, &format, fse->which);
 567         fse->max_width = format.width;
 568         fse->max_height = format.height;
 569
 570         return 0;
 571 }
 572
 573 /*
 574  * resizer_get_format - Retrieve the video format on a pad
 575  * @sd : ISP RESIZER V4L2 subdevice
 576  * @cfg: V4L2 subdev pad config
 577  * @fmt: Format
 578  *
 579  * Return 0 on success or -EINVAL if the pad is invalid or doesn't correspond
 580  * to the format type.
 581  */
 582 static int resizer_get_format(struct v4l2_subdev *sd,
 583                               struct v4l2_subdev_pad_config *cfg,
 584                               struct v4l2_subdev_format *fmt)
 585 {
 586         struct iss_resizer_device *resizer = v4l2_get_subdevdata(sd);
 587         struct v4l2_mbus_framefmt *format;
 588
 589         format = __resizer_get_format(resizer, cfg, fmt->pad, fmt->which);
 590         if (!format)
 591                 return -EINVAL;
 592
 593         fmt->format = *format;
 594         return 0;
 595 }
 596
 597 /*
 598  * resizer_set_format - Set the video format on a pad
 599  * @sd : ISP RESIZER V4L2 subdevice
 600  * @cfg: V4L2 subdev pad config
 601  * @fmt: Format
 602  *
 603  * Return 0 on success or -EINVAL if the pad is invalid or doesn't correspond
 604  * to the format type.
 605  */
 606 static int resizer_set_format(struct v4l2_subdev *sd,
 607                               struct v4l2_subdev_pad_config *cfg,
 608                               struct v4l2_subdev_format *fmt)
 609 {
 610         struct iss_resizer_device *resizer = v4l2_get_subdevdata(sd);
 611         struct v4l2_mbus_framefmt *format;
 612
 613         format = __resizer_get_format(resizer, cfg, fmt->pad, fmt->which);
 614         if (!format)
 615                 return -EINVAL;
 616
 617         resizer_try_format(resizer, cfg, fmt->pad, &fmt->format, fmt->which);
 618         *format = fmt->format;
 619
 620         /* Propagate the format from sink to source */
 621         if (fmt->pad == RESIZER_PAD_SINK) {
 622                 format = __resizer_get_format(resizer, cfg,
 623                                               RESIZER_PAD_SOURCE_MEM,
 624                                               fmt->which);
 625                 *format = fmt->format;
 626                 resizer_try_format(resizer, cfg, RESIZER_PAD_SOURCE_MEM, format,
 627                                    fmt->which);
 628         }
 629
 630         return 0;
 631 }
 632
 633 static int resizer_link_validate(struct v4l2_subdev *sd,
 634                                  struct media_link *link,
 635                                  struct v4l2_subdev_format *source_fmt,
 636                                  struct v4l2_subdev_format *sink_fmt)
 637 {
 638         /* Check if the two ends match */
 639         if (source_fmt->format.width != sink_fmt->format.width ||
 640             source_fmt->format.height != sink_fmt->format.height)
 641                 return -EPIPE;
 642
 643         if (source_fmt->format.code != sink_fmt->format.code)
 644                 return -EPIPE;
 645
 646         return 0;
 647 }
 648
 649 /*
 650  * resizer_init_formats - Initialize formats on all pads
 651  * @sd: ISP RESIZER V4L2 subdevice
 652  * @fh: V4L2 subdev file handle
 653  *
 654  * Initialize all pad formats with default values. If fh is not NULL, try
 655  * formats are initialized on the file handle. Otherwise active formats are
 656  * initialized on the device.
 657  */
 658 static int resizer_init_formats(struct v4l2_subdev *sd,
 659                                 struct v4l2_subdev_fh *fh)
 660 {
 661         struct v4l2_subdev_format format;
 662
 663         memset(&format, 0, sizeof(format));
 664         format.pad = RESIZER_PAD_SINK;
 665         format.which = fh ? V4L2_SUBDEV_FORMAT_TRY : V4L2_SUBDEV_FORMAT_ACTIVE;
 666         format.format.code = MEDIA_BUS_FMT_UYVY8_1X16;
 667         format.format.width = 4096;
 668         format.format.height = 4096;
 669         resizer_set_format(sd, fh ? fh->pad : NULL, &format);
 670
 671         return 0;
 672 }
 673
 674 /* V4L2 subdev video operations */
 675 static const struct v4l2_subdev_video_ops resizer_v4l2_video_ops = {
 676         .s_stream = resizer_set_stream,
 677 };
 678
 679 /* V4L2 subdev pad operations */
 680 static const struct v4l2_subdev_pad_ops resizer_v4l2_pad_ops = {
 681         .enum_mbus_code = resizer_enum_mbus_code,
 682         .enum_frame_size = resizer_enum_frame_size,
 683         .get_fmt = resizer_get_format,
 684         .set_fmt = resizer_set_format,
 685         .link_validate = resizer_link_validate,
 686 };
 687
 688 /* V4L2 subdev operations */
 689 static const struct v4l2_subdev_ops resizer_v4l2_ops = {
 690         .video = &resizer_v4l2_video_ops,
 691         .pad = &resizer_v4l2_pad_ops,
 692 };
 693
 694 /* V4L2 subdev internal operations */
 695 static const struct v4l2_subdev_internal_ops resizer_v4l2_internal_ops = {
 696         .open = resizer_init_formats,
 697 };
 698
 699 /* -----------------------------------------------------------------------------
 700  * Media entity operations
 701  */
 702
 703 /*
 704  * resizer_link_setup - Setup RESIZER connections
 705  * @entity: RESIZER media entity
 706  * @local: Pad at the local end of the link
 707  * @remote: Pad at the remote end of the link
 708  * @flags: Link flags
 709  *
 710  * return -EINVAL or zero on success
 711  */
 712 static int resizer_link_setup(struct media_entity *entity,
 713                               const struct media_pad *local,
 714                               const struct media_pad *remote, u32 flags)
 715 {
 716         struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
 717         struct iss_resizer_device *resizer = v4l2_get_subdevdata(sd);
 718         struct iss_device *iss = to_iss_device(resizer);
 719
 720         switch (local->index | media_entity_type(remote->entity)) {
 721         case RESIZER_PAD_SINK | MEDIA_ENT_T_V4L2_SUBDEV:
 722                 /* Read from IPIPE or IPIPEIF. */
 723                 if (!(flags & MEDIA_LNK_FL_ENABLED)) {
 724                         resizer->input = RESIZER_INPUT_NONE;
 725                         break;
 726                 }
 727
 728                 if (resizer->input != RESIZER_INPUT_NONE)
 729                         return -EBUSY;
 730
 731                 if (remote->entity == &iss->ipipeif.subdev.entity)
 732                         resizer->input = RESIZER_INPUT_IPIPEIF;
 733                 else if (remote->entity == &iss->ipipe.subdev.entity)
 734                         resizer->input = RESIZER_INPUT_IPIPE;
 735
 736                 break;
 737
 738         case RESIZER_PAD_SOURCE_MEM | MEDIA_ENT_T_DEVNODE:
 739                 /* Write to memory */
 740                 if (flags & MEDIA_LNK_FL_ENABLED) {
 741                         if (resizer->output & ~RESIZER_OUTPUT_MEMORY)
 742                                 return -EBUSY;
 743                         resizer->output |= RESIZER_OUTPUT_MEMORY;
 744                 } else {
 745                         resizer->output &= ~RESIZER_OUTPUT_MEMORY;
 746                 }
 747                 break;
 748
 749         default:
 750                 return -EINVAL;
 751         }
 752
 753         return 0;
 754 }
 755
 756 /* media operations */
 757 static const struct media_entity_operations resizer_media_ops = {
 758         .link_setup = resizer_link_setup,
 759         .link_validate = v4l2_subdev_link_validate,
 760 };
 761
 762 /*
 763  * resizer_init_entities - Initialize V4L2 subdev and media entity
 764  * @resizer: ISS ISP RESIZER module
 765  *
 766  * Return 0 on success and a negative error code on failure.
 767  */
 768 static int resizer_init_entities(struct iss_resizer_device *resizer)
 769 {
 770         struct v4l2_subdev *sd = &resizer->subdev;
 771         struct media_pad *pads = resizer->pads;
 772         struct media_entity *me = &sd->entity;
 773         int ret;
 774
 775         resizer->input = RESIZER_INPUT_NONE;
 776
 777         v4l2_subdev_init(sd, &resizer_v4l2_ops);
 778         sd->internal_ops = &resizer_v4l2_internal_ops;
 779         strlcpy(sd->name, "OMAP4 ISS ISP resizer", sizeof(sd->name));
 780         sd->grp_id = 1 << 16;   /* group ID for iss subdevs */
 781         v4l2_set_subdevdata(sd, resizer);
 782         sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
 783
 784         pads[RESIZER_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
 785         pads[RESIZER_PAD_SOURCE_MEM].flags = MEDIA_PAD_FL_SOURCE;
 786
 787         me->ops = &resizer_media_ops;
 788         ret = media_entity_init(me, RESIZER_PADS_NUM, pads);
 789         if (ret < 0)
 790                 return ret;
 791
 792         resizer_init_formats(sd, NULL);
 793
 794         resizer->video_out.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 795         resizer->video_out.ops = &resizer_video_ops;
 796         resizer->video_out.iss = to_iss_device(resizer);
 797         resizer->video_out.capture_mem = PAGE_ALIGN(4096 * 4096) * 3;
 798         resizer->video_out.bpl_alignment = 32;
 799         resizer->video_out.bpl_zero_padding = 1;
 800         resizer->video_out.bpl_max = 0x1ffe0;
 801
 802         return omap4iss_video_init(&resizer->video_out, "ISP resizer a");
 803 }
 804
 805 void omap4iss_resizer_unregister_entities(struct iss_resizer_device *resizer)
 806 {
 807         v4l2_device_unregister_subdev(&resizer->subdev);
 808         omap4iss_video_unregister(&resizer->video_out);
 809 }
 810
 811 int omap4iss_resizer_register_entities(struct iss_resizer_device *resizer,
 812                                        struct v4l2_device *vdev)
 813 {
 814         int ret;
 815
 816         /* Register the subdev and video node. */
 817         ret = v4l2_device_register_subdev(vdev, &resizer->subdev);
 818         if (ret < 0)
 819                 goto error;
 820
 821         ret = omap4iss_video_register(&resizer->video_out, vdev);
 822         if (ret < 0)
 823                 goto error;
 824
 825         return 0;
 826
 827 error:
 828         omap4iss_resizer_unregister_entities(resizer);
 829         return ret;
 830 }
 831
 832 /* -----------------------------------------------------------------------------
 833  * ISP RESIZER initialisation and cleanup
 834  */
 835
 836 /*
 837  * omap4iss_resizer_init - RESIZER module initialization.
 838  * @iss: Device pointer specific to the OMAP4 ISS.
 839  *
 840  * TODO: Get the initialisation values from platform data.
 841  *
 842  * Return 0 on success or a negative error code otherwise.
 843  */
 844 int omap4iss_resizer_init(struct iss_device *iss)
 845 {
 846         struct iss_resizer_device *resizer = &iss->resizer;
 847
 848         resizer->state = ISS_PIPELINE_STREAM_STOPPED;
 849         init_waitqueue_head(&resizer->wait);
 850
 851         return resizer_init_entities(resizer);
 852 }
 853
 854 /*
 855  * omap4iss_resizer_create_pads_links() - RESIZER pads links creation
 856  * @iss: Pointer to ISS device
 857  *
 858  * return negative error code or zero on success
 859  */
 860 int omap4iss_resizer_create_pads_links(struct iss_device *iss)
 861 {
 862         struct iss_resizer_device *resizer = &iss->resizer;
 863
 864         /* Connect the RESIZER subdev to the video node. */
 865         return media_create_pad_link(&resizer->subdev.entity,
 866                                      RESIZER_PAD_SOURCE_MEM,
 867                                      &resizer->video_out.video.entity, 0, 0);
 868 }
 869
 870 /*
 871  * omap4iss_resizer_cleanup - RESIZER module cleanup.
 872  * @iss: Device pointer specific to the OMAP4 ISS.
 873  */
 874 void omap4iss_resizer_cleanup(struct iss_device *iss)
 875 {
 876         struct iss_resizer_device *resizer = &iss->resizer;
 877
 878         media_entity_cleanup(&resizer->subdev.entity);
 879 }