drivers/media/platform/soc_camera/mx2_camera.c

   1 /*
   2  * V4L2 Driver for i.MX27 camera host
   3  *
   4  * Copyright (C) 2008, Sascha Hauer, Pengutronix
   5  * Copyright (C) 2010, Baruch Siach, Orex Computed Radiography
   6  * Copyright (C) 2012, Javier Martin, Vista Silicon S.L.
   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/init.h>
  15 #include <linux/module.h>
  16 #include <linux/io.h>
  17 #include <linux/delay.h>
  18 #include <linux/slab.h>
  19 #include <linux/dma-mapping.h>
  20 #include <linux/errno.h>
  21 #include <linux/fs.h>
  22 #include <linux/gcd.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/kernel.h>
  25 #include <linux/math64.h>
  26 #include <linux/mm.h>
  27 #include <linux/moduleparam.h>
  28 #include <linux/time.h>
  29 #include <linux/device.h>
  30 #include <linux/platform_device.h>
  31 #include <linux/clk.h>
  32
  33 #include <media/v4l2-common.h>
  34 #include <media/v4l2-dev.h>
  35 #include <media/videobuf2-v4l2.h>
  36 #include <media/videobuf2-dma-contig.h>
  37 #include <media/soc_camera.h>
  38 #include <media/soc_mediabus.h>
  39
  40 #include <linux/videodev2.h>
  41
  42 #include <linux/platform_data/camera-mx2.h>
  43
  44 #include <asm/dma.h>
  45
  46 #define MX2_CAM_DRV_NAME "mx2-camera"
  47 #define MX2_CAM_VERSION "0.0.6"
  48 #define MX2_CAM_DRIVER_DESCRIPTION "i.MX2x_Camera"
  49
  50 /* reset values */
  51 #define CSICR1_RESET_VAL        0x40000800
  52 #define CSICR2_RESET_VAL        0x0
  53 #define CSICR3_RESET_VAL        0x0
  54
  55 /* csi control reg 1 */
  56 #define CSICR1_SWAP16_EN        (1 << 31)
  57 #define CSICR1_EXT_VSYNC        (1 << 30)
  58 #define CSICR1_EOF_INTEN        (1 << 29)
  59 #define CSICR1_PRP_IF_EN        (1 << 28)
  60 #define CSICR1_CCIR_MODE        (1 << 27)
  61 #define CSICR1_COF_INTEN        (1 << 26)
  62 #define CSICR1_SF_OR_INTEN      (1 << 25)
  63 #define CSICR1_RF_OR_INTEN      (1 << 24)
  64 #define CSICR1_STATFF_LEVEL     (3 << 22)
  65 #define CSICR1_STATFF_INTEN     (1 << 21)
  66 #define CSICR1_RXFF_LEVEL(l)    (((l) & 3) << 19)
  67 #define CSICR1_RXFF_INTEN       (1 << 18)
  68 #define CSICR1_SOF_POL          (1 << 17)
  69 #define CSICR1_SOF_INTEN        (1 << 16)
  70 #define CSICR1_MCLKDIV(d)       (((d) & 0xF) << 12)
  71 #define CSICR1_HSYNC_POL        (1 << 11)
  72 #define CSICR1_CCIR_EN          (1 << 10)
  73 #define CSICR1_MCLKEN           (1 << 9)
  74 #define CSICR1_FCC              (1 << 8)
  75 #define CSICR1_PACK_DIR         (1 << 7)
  76 #define CSICR1_CLR_STATFIFO     (1 << 6)
  77 #define CSICR1_CLR_RXFIFO       (1 << 5)
  78 #define CSICR1_GCLK_MODE        (1 << 4)
  79 #define CSICR1_INV_DATA         (1 << 3)
  80 #define CSICR1_INV_PCLK         (1 << 2)
  81 #define CSICR1_REDGE            (1 << 1)
  82 #define CSICR1_FMT_MASK         (CSICR1_PACK_DIR | CSICR1_SWAP16_EN)
  83
  84 #define SHIFT_STATFF_LEVEL      22
  85 #define SHIFT_RXFF_LEVEL        19
  86 #define SHIFT_MCLKDIV           12
  87
  88 #define SHIFT_FRMCNT            16
  89
  90 #define CSICR1                  0x00
  91 #define CSICR2                  0x04
  92 #define CSISR                   0x08
  93 #define CSISTATFIFO             0x0c
  94 #define CSIRFIFO                0x10
  95 #define CSIRXCNT                0x14
  96 #define CSICR3                  0x1c
  97 #define CSIDMASA_STATFIFO       0x20
  98 #define CSIDMATA_STATFIFO       0x24
  99 #define CSIDMASA_FB1            0x28
 100 #define CSIDMASA_FB2            0x2c
 101 #define CSIFBUF_PARA            0x30
 102 #define CSIIMAG_PARA            0x34
 103
 104 /* EMMA PrP */
 105 #define PRP_CNTL                        0x00
 106 #define PRP_INTR_CNTL                   0x04
 107 #define PRP_INTRSTATUS                  0x08
 108 #define PRP_SOURCE_Y_PTR                0x0c
 109 #define PRP_SOURCE_CB_PTR               0x10
 110 #define PRP_SOURCE_CR_PTR               0x14
 111 #define PRP_DEST_RGB1_PTR               0x18
 112 #define PRP_DEST_RGB2_PTR               0x1c
 113 #define PRP_DEST_Y_PTR                  0x20
 114 #define PRP_DEST_CB_PTR                 0x24
 115 #define PRP_DEST_CR_PTR                 0x28
 116 #define PRP_SRC_FRAME_SIZE              0x2c
 117 #define PRP_DEST_CH1_LINE_STRIDE        0x30
 118 #define PRP_SRC_PIXEL_FORMAT_CNTL       0x34
 119 #define PRP_CH1_PIXEL_FORMAT_CNTL       0x38
 120 #define PRP_CH1_OUT_IMAGE_SIZE          0x3c
 121 #define PRP_CH2_OUT_IMAGE_SIZE          0x40
 122 #define PRP_SRC_LINE_STRIDE             0x44
 123 #define PRP_CSC_COEF_012                0x48
 124 #define PRP_CSC_COEF_345                0x4c
 125 #define PRP_CSC_COEF_678                0x50
 126 #define PRP_CH1_RZ_HORI_COEF1           0x54
 127 #define PRP_CH1_RZ_HORI_COEF2           0x58
 128 #define PRP_CH1_RZ_HORI_VALID           0x5c
 129 #define PRP_CH1_RZ_VERT_COEF1           0x60
 130 #define PRP_CH1_RZ_VERT_COEF2           0x64
 131 #define PRP_CH1_RZ_VERT_VALID           0x68
 132 #define PRP_CH2_RZ_HORI_COEF1           0x6c
 133 #define PRP_CH2_RZ_HORI_COEF2           0x70
 134 #define PRP_CH2_RZ_HORI_VALID           0x74
 135 #define PRP_CH2_RZ_VERT_COEF1           0x78
 136 #define PRP_CH2_RZ_VERT_COEF2           0x7c
 137 #define PRP_CH2_RZ_VERT_VALID           0x80
 138
 139 #define PRP_CNTL_CH1EN          (1 << 0)
 140 #define PRP_CNTL_CH2EN          (1 << 1)
 141 #define PRP_CNTL_CSIEN          (1 << 2)
 142 #define PRP_CNTL_DATA_IN_YUV420 (0 << 3)
 143 #define PRP_CNTL_DATA_IN_YUV422 (1 << 3)
 144 #define PRP_CNTL_DATA_IN_RGB16  (2 << 3)
 145 #define PRP_CNTL_DATA_IN_RGB32  (3 << 3)
 146 #define PRP_CNTL_CH1_OUT_RGB8   (0 << 5)
 147 #define PRP_CNTL_CH1_OUT_RGB16  (1 << 5)
 148 #define PRP_CNTL_CH1_OUT_RGB32  (2 << 5)
 149 #define PRP_CNTL_CH1_OUT_YUV422 (3 << 5)
 150 #define PRP_CNTL_CH2_OUT_YUV420 (0 << 7)
 151 #define PRP_CNTL_CH2_OUT_YUV422 (1 << 7)
 152 #define PRP_CNTL_CH2_OUT_YUV444 (2 << 7)
 153 #define PRP_CNTL_CH1_LEN        (1 << 9)
 154 #define PRP_CNTL_CH2_LEN        (1 << 10)
 155 #define PRP_CNTL_SKIP_FRAME     (1 << 11)
 156 #define PRP_CNTL_SWRST          (1 << 12)
 157 #define PRP_CNTL_CLKEN          (1 << 13)
 158 #define PRP_CNTL_WEN            (1 << 14)
 159 #define PRP_CNTL_CH1BYP         (1 << 15)
 160 #define PRP_CNTL_IN_TSKIP(x)    ((x) << 16)
 161 #define PRP_CNTL_CH1_TSKIP(x)   ((x) << 19)
 162 #define PRP_CNTL_CH2_TSKIP(x)   ((x) << 22)
 163 #define PRP_CNTL_INPUT_FIFO_LEVEL(x)    ((x) << 25)
 164 #define PRP_CNTL_RZ_FIFO_LEVEL(x)       ((x) << 27)
 165 #define PRP_CNTL_CH2B1EN        (1 << 29)
 166 #define PRP_CNTL_CH2B2EN        (1 << 30)
 167 #define PRP_CNTL_CH2FEN         (1 << 31)
 168
 169 /* IRQ Enable and status register */
 170 #define PRP_INTR_RDERR          (1 << 0)
 171 #define PRP_INTR_CH1WERR        (1 << 1)
 172 #define PRP_INTR_CH2WERR        (1 << 2)
 173 #define PRP_INTR_CH1FC          (1 << 3)
 174 #define PRP_INTR_CH2FC          (1 << 5)
 175 #define PRP_INTR_LBOVF          (1 << 7)
 176 #define PRP_INTR_CH2OVF         (1 << 8)
 177
 178 /* Resizing registers */
 179 #define PRP_RZ_VALID_TBL_LEN(x) ((x) << 24)
 180 #define PRP_RZ_VALID_BILINEAR   (1 << 31)
 181
 182 #define MAX_VIDEO_MEM   16
 183
 184 #define RESIZE_NUM_MIN  1
 185 #define RESIZE_NUM_MAX  20
 186 #define BC_COEF         3
 187 #define SZ_COEF         (1 << BC_COEF)
 188
 189 #define RESIZE_DIR_H    0
 190 #define RESIZE_DIR_V    1
 191
 192 #define RESIZE_ALGO_BILINEAR 0
 193 #define RESIZE_ALGO_AVERAGING 1
 194
 195 struct mx2_prp_cfg {
 196         int channel;
 197         u32 in_fmt;
 198         u32 out_fmt;
 199         u32 src_pixel;
 200         u32 ch1_pixel;
 201         u32 irq_flags;
 202         u32 csicr1;
 203 };
 204
 205 /* prp resizing parameters */
 206 struct emma_prp_resize {
 207         int             algo; /* type of algorithm used */
 208         int             len; /* number of coefficients */
 209         unsigned char   s[RESIZE_NUM_MAX]; /* table of coefficients */
 210 };
 211
 212 /* prp configuration for a client-host fmt pair */
 213 struct mx2_fmt_cfg {
 214         u32     in_fmt;
 215         u32                             out_fmt;
 216         struct mx2_prp_cfg              cfg;
 217 };
 218
 219 struct mx2_buf_internal {
 220         struct list_head        queue;
 221         int                     bufnum;
 222         bool                    discard;
 223 };
 224
 225 /* buffer for one video frame */
 226 struct mx2_buffer {
 227         /* common v4l buffer stuff -- must be first */
 228         struct vb2_v4l2_buffer vb;
 229         struct mx2_buf_internal         internal;
 230 };
 231
 232 enum mx2_camera_type {
 233         IMX27_CAMERA,
 234 };
 235
 236 struct mx2_camera_dev {
 237         struct device           *dev;
 238         struct soc_camera_host  soc_host;
 239         struct clk              *clk_emma_ahb, *clk_emma_ipg;
 240         struct clk              *clk_csi_ahb, *clk_csi_per;
 241
 242         void __iomem            *base_csi, *base_emma;
 243
 244         struct mx2_camera_platform_data *pdata;
 245         unsigned long           platform_flags;
 246
 247         struct list_head        capture;
 248         struct list_head        active_bufs;
 249         struct list_head        discard;
 250
 251         spinlock_t              lock;
 252
 253         int                     dma;
 254         struct mx2_buffer       *active;
 255         struct mx2_buffer       *fb1_active;
 256         struct mx2_buffer       *fb2_active;
 257
 258         u32                     csicr1;
 259         enum mx2_camera_type    devtype;
 260
 261         struct mx2_buf_internal buf_discard[2];
 262         void                    *discard_buffer;
 263         dma_addr_t              discard_buffer_dma;
 264         size_t                  discard_size;
 265         struct mx2_fmt_cfg      *emma_prp;
 266         struct emma_prp_resize  resizing[2];
 267         unsigned int            s_width, s_height;
 268         u32                     frame_count;
 269         struct vb2_alloc_ctx    *alloc_ctx;
 270 };
 271
 272 static struct platform_device_id mx2_camera_devtype[] = {
 273         {
 274                 .name = "imx27-camera",
 275                 .driver_data = IMX27_CAMERA,
 276         }, {
 277                 /* sentinel */
 278         }
 279 };
 280 MODULE_DEVICE_TABLE(platform, mx2_camera_devtype);
 281
 282 static struct mx2_buffer *mx2_ibuf_to_buf(struct mx2_buf_internal *int_buf)
 283 {
 284         return container_of(int_buf, struct mx2_buffer, internal);
 285 }
 286
 287 static struct mx2_fmt_cfg mx27_emma_prp_table[] = {
 288         /*
 289          * This is a generic configuration which is valid for most
 290          * prp input-output format combinations.
 291          * We set the incoming and outgoing pixelformat to a
 292          * 16 Bit wide format and adjust the bytesperline
 293          * accordingly. With this configuration the inputdata
 294          * will not be changed by the emma and could be any type
 295          * of 16 Bit Pixelformat.
 296          */
 297         {
 298                 .in_fmt         = 0,
 299                 .out_fmt        = 0,
 300                 .cfg            = {
 301                         .channel        = 1,
 302                         .in_fmt         = PRP_CNTL_DATA_IN_RGB16,
 303                         .out_fmt        = PRP_CNTL_CH1_OUT_RGB16,
 304                         .src_pixel      = 0x2ca00565, /* RGB565 */
 305                         .ch1_pixel      = 0x2ca00565, /* RGB565 */
 306                         .irq_flags      = PRP_INTR_RDERR | PRP_INTR_CH1WERR |
 307                                                 PRP_INTR_CH1FC | PRP_INTR_LBOVF,
 308                         .csicr1         = 0,
 309                 }
 310         },
 311         {
 312                 .in_fmt         = MEDIA_BUS_FMT_UYVY8_2X8,
 313                 .out_fmt        = V4L2_PIX_FMT_YUYV,
 314                 .cfg            = {
 315                         .channel        = 1,
 316                         .in_fmt         = PRP_CNTL_DATA_IN_YUV422,
 317                         .out_fmt        = PRP_CNTL_CH1_OUT_YUV422,
 318                         .src_pixel      = 0x22000888, /* YUV422 (YUYV) */
 319                         .ch1_pixel      = 0x62000888, /* YUV422 (YUYV) */
 320                         .irq_flags      = PRP_INTR_RDERR | PRP_INTR_CH1WERR |
 321                                                 PRP_INTR_CH1FC | PRP_INTR_LBOVF,
 322                         .csicr1         = CSICR1_SWAP16_EN,
 323                 }
 324         },
 325         {
 326                 .in_fmt         = MEDIA_BUS_FMT_YUYV8_2X8,
 327                 .out_fmt        = V4L2_PIX_FMT_YUYV,
 328                 .cfg            = {
 329                         .channel        = 1,
 330                         .in_fmt         = PRP_CNTL_DATA_IN_YUV422,
 331                         .out_fmt        = PRP_CNTL_CH1_OUT_YUV422,
 332                         .src_pixel      = 0x22000888, /* YUV422 (YUYV) */
 333                         .ch1_pixel      = 0x62000888, /* YUV422 (YUYV) */
 334                         .irq_flags      = PRP_INTR_RDERR | PRP_INTR_CH1WERR |
 335                                                 PRP_INTR_CH1FC | PRP_INTR_LBOVF,
 336                         .csicr1         = CSICR1_PACK_DIR,
 337                 }
 338         },
 339         {
 340                 .in_fmt         = MEDIA_BUS_FMT_YUYV8_2X8,
 341                 .out_fmt        = V4L2_PIX_FMT_YUV420,
 342                 .cfg            = {
 343                         .channel        = 2,
 344                         .in_fmt         = PRP_CNTL_DATA_IN_YUV422,
 345                         .out_fmt        = PRP_CNTL_CH2_OUT_YUV420,
 346                         .src_pixel      = 0x22000888, /* YUV422 (YUYV) */
 347                         .irq_flags      = PRP_INTR_RDERR | PRP_INTR_CH2WERR |
 348                                         PRP_INTR_CH2FC | PRP_INTR_LBOVF |
 349                                         PRP_INTR_CH2OVF,
 350                         .csicr1         = CSICR1_PACK_DIR,
 351                 }
 352         },
 353         {
 354                 .in_fmt         = MEDIA_BUS_FMT_UYVY8_2X8,
 355                 .out_fmt        = V4L2_PIX_FMT_YUV420,
 356                 .cfg            = {
 357                         .channel        = 2,
 358                         .in_fmt         = PRP_CNTL_DATA_IN_YUV422,
 359                         .out_fmt        = PRP_CNTL_CH2_OUT_YUV420,
 360                         .src_pixel      = 0x22000888, /* YUV422 (YUYV) */
 361                         .irq_flags      = PRP_INTR_RDERR | PRP_INTR_CH2WERR |
 362                                         PRP_INTR_CH2FC | PRP_INTR_LBOVF |
 363                                         PRP_INTR_CH2OVF,
 364                         .csicr1         = CSICR1_SWAP16_EN,
 365                 }
 366         },
 367 };
 368
 369 static struct mx2_fmt_cfg *mx27_emma_prp_get_format(u32 in_fmt, u32 out_fmt)
 370 {
 371         int i;
 372
 373         for (i = 1; i < ARRAY_SIZE(mx27_emma_prp_table); i++)
 374                 if ((mx27_emma_prp_table[i].in_fmt == in_fmt) &&
 375                                 (mx27_emma_prp_table[i].out_fmt == out_fmt)) {
 376                         return &mx27_emma_prp_table[i];
 377                 }
 378         /* If no match return the most generic configuration */
 379         return &mx27_emma_prp_table[0];
 380 };
 381
 382 static void mx27_update_emma_buf(struct mx2_camera_dev *pcdev,
 383                                  unsigned long phys, int bufnum)
 384 {
 385         struct mx2_fmt_cfg *prp = pcdev->emma_prp;
 386
 387         if (prp->cfg.channel == 1) {
 388                 writel(phys, pcdev->base_emma +
 389                                 PRP_DEST_RGB1_PTR + 4 * bufnum);
 390         } else {
 391                 writel(phys, pcdev->base_emma +
 392                         PRP_DEST_Y_PTR - 0x14 * bufnum);
 393                 if (prp->out_fmt == V4L2_PIX_FMT_YUV420) {
 394                         u32 imgsize = pcdev->soc_host.icd->user_height *
 395                                         pcdev->soc_host.icd->user_width;
 396
 397                         writel(phys + imgsize, pcdev->base_emma +
 398                                 PRP_DEST_CB_PTR - 0x14 * bufnum);
 399                         writel(phys + ((5 * imgsize) / 4), pcdev->base_emma +
 400                                 PRP_DEST_CR_PTR - 0x14 * bufnum);
 401                 }
 402         }
 403 }
 404
 405 static void mx2_camera_deactivate(struct mx2_camera_dev *pcdev)
 406 {
 407         clk_disable_unprepare(pcdev->clk_csi_ahb);
 408         clk_disable_unprepare(pcdev->clk_csi_per);
 409         writel(0, pcdev->base_csi + CSICR1);
 410         writel(0, pcdev->base_emma + PRP_CNTL);
 411 }
 412
 413 static int mx2_camera_add_device(struct soc_camera_device *icd)
 414 {
 415         dev_info(icd->parent, "Camera driver attached to camera %d\n",
 416                  icd->devnum);
 417
 418         return 0;
 419 }
 420
 421 static void mx2_camera_remove_device(struct soc_camera_device *icd)
 422 {
 423         dev_info(icd->parent, "Camera driver detached from camera %d\n",
 424                  icd->devnum);
 425 }
 426
 427 /*
 428  * The following two functions absolutely depend on the fact, that
 429  * there can be only one camera on mx2 camera sensor interface
 430  */
 431 static int mx2_camera_clock_start(struct soc_camera_host *ici)
 432 {
 433         struct mx2_camera_dev *pcdev = ici->priv;
 434         int ret;
 435         u32 csicr1;
 436
 437         ret = clk_prepare_enable(pcdev->clk_csi_ahb);
 438         if (ret < 0)
 439                 return ret;
 440
 441         ret = clk_prepare_enable(pcdev->clk_csi_per);
 442         if (ret < 0)
 443                 goto exit_csi_ahb;
 444
 445         csicr1 = CSICR1_MCLKEN | CSICR1_PRP_IF_EN | CSICR1_FCC |
 446                 CSICR1_RXFF_LEVEL(0);
 447
 448         pcdev->csicr1 = csicr1;
 449         writel(pcdev->csicr1, pcdev->base_csi + CSICR1);
 450
 451         pcdev->frame_count = 0;
 452
 453         return 0;
 454
 455 exit_csi_ahb:
 456         clk_disable_unprepare(pcdev->clk_csi_ahb);
 457
 458         return ret;
 459 }
 460
 461 static void mx2_camera_clock_stop(struct soc_camera_host *ici)
 462 {
 463         struct mx2_camera_dev *pcdev = ici->priv;
 464
 465         mx2_camera_deactivate(pcdev);
 466 }
 467
 468 /*
 469  *  Videobuf operations
 470  */
 471 static int mx2_videobuf_setup(struct vb2_queue *vq,
 472                         const void *parg,
 473                         unsigned int *count, unsigned int *num_planes,
 474                         unsigned int sizes[], void *alloc_ctxs[])
 475 {
 476         const struct v4l2_format *fmt = parg;
 477         struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
 478         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 479         struct mx2_camera_dev *pcdev = ici->priv;
 480
 481         dev_dbg(icd->parent, "count=%d, size=%d\n", *count, sizes[0]);
 482
 483         /* TODO: support for VIDIOC_CREATE_BUFS not ready */
 484         if (fmt != NULL)
 485                 return -ENOTTY;
 486
 487         alloc_ctxs[0] = pcdev->alloc_ctx;
 488
 489         sizes[0] = icd->sizeimage;
 490
 491         if (0 == *count)
 492                 *count = 32;
 493         if (!*num_planes &&
 494             sizes[0] * *count > MAX_VIDEO_MEM * 1024 * 1024)
 495                 *count = (MAX_VIDEO_MEM * 1024 * 1024) / sizes[0];
 496
 497         *num_planes = 1;
 498
 499         return 0;
 500 }
 501
 502 static int mx2_videobuf_prepare(struct vb2_buffer *vb)
 503 {
 504         struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
 505         int ret = 0;
 506
 507         dev_dbg(icd->parent, "%s (vb=0x%p) 0x%p %lu\n", __func__,
 508                 vb, vb2_plane_vaddr(vb, 0), vb2_get_plane_payload(vb, 0));
 509
 510 #ifdef DEBUG
 511         /*
 512          * This can be useful if you want to see if we actually fill
 513          * the buffer with something
 514          */
 515         memset((void *)vb2_plane_vaddr(vb, 0),
 516                0xaa, vb2_get_plane_payload(vb, 0));
 517 #endif
 518
 519         vb2_set_plane_payload(vb, 0, icd->sizeimage);
 520         if (vb2_plane_vaddr(vb, 0) &&
 521             vb2_get_plane_payload(vb, 0) > vb2_plane_size(vb, 0)) {
 522                 ret = -EINVAL;
 523                 goto out;
 524         }
 525
 526         return 0;
 527
 528 out:
 529         return ret;
 530 }
 531
 532 static void mx2_videobuf_queue(struct vb2_buffer *vb)
 533 {
 534         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 535         struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
 536         struct soc_camera_host *ici =
 537                 to_soc_camera_host(icd->parent);
 538         struct mx2_camera_dev *pcdev = ici->priv;
 539         struct mx2_buffer *buf = container_of(vbuf, struct mx2_buffer, vb);
 540         unsigned long flags;
 541
 542         dev_dbg(icd->parent, "%s (vb=0x%p) 0x%p %lu\n", __func__,
 543                 vb, vb2_plane_vaddr(vb, 0), vb2_get_plane_payload(vb, 0));
 544
 545         spin_lock_irqsave(&pcdev->lock, flags);
 546
 547         list_add_tail(&buf->internal.queue, &pcdev->capture);
 548
 549         spin_unlock_irqrestore(&pcdev->lock, flags);
 550 }
 551
 552 static void mx27_camera_emma_buf_init(struct soc_camera_device *icd,
 553                 int bytesperline)
 554 {
 555         struct soc_camera_host *ici =
 556                 to_soc_camera_host(icd->parent);
 557         struct mx2_camera_dev *pcdev = ici->priv;
 558         struct mx2_fmt_cfg *prp = pcdev->emma_prp;
 559
 560         writel((pcdev->s_width << 16) | pcdev->s_height,
 561                pcdev->base_emma + PRP_SRC_FRAME_SIZE);
 562         writel(prp->cfg.src_pixel,
 563                pcdev->base_emma + PRP_SRC_PIXEL_FORMAT_CNTL);
 564         if (prp->cfg.channel == 1) {
 565                 writel((icd->user_width << 16) | icd->user_height,
 566                         pcdev->base_emma + PRP_CH1_OUT_IMAGE_SIZE);
 567                 writel(bytesperline,
 568                         pcdev->base_emma + PRP_DEST_CH1_LINE_STRIDE);
 569                 writel(prp->cfg.ch1_pixel,
 570                         pcdev->base_emma + PRP_CH1_PIXEL_FORMAT_CNTL);
 571         } else { /* channel 2 */
 572                 writel((icd->user_width << 16) | icd->user_height,
 573                         pcdev->base_emma + PRP_CH2_OUT_IMAGE_SIZE);
 574         }
 575
 576         /* Enable interrupts */
 577         writel(prp->cfg.irq_flags, pcdev->base_emma + PRP_INTR_CNTL);
 578 }
 579
 580 static void mx2_prp_resize_commit(struct mx2_camera_dev *pcdev)
 581 {
 582         int dir;
 583
 584         for (dir = RESIZE_DIR_H; dir <= RESIZE_DIR_V; dir++) {
 585                 unsigned char *s = pcdev->resizing[dir].s;
 586                 int len = pcdev->resizing[dir].len;
 587                 unsigned int coeff[2] = {0, 0};
 588                 unsigned int valid  = 0;
 589                 int i;
 590
 591                 if (len == 0)
 592                         continue;
 593
 594                 for (i = RESIZE_NUM_MAX - 1; i >= 0; i--) {
 595                         int j;
 596
 597                         j = i > 9 ? 1 : 0;
 598                         coeff[j] = (coeff[j] << BC_COEF) |
 599                                         (s[i] & (SZ_COEF - 1));
 600
 601                         if (i == 5 || i == 15)
 602                                 coeff[j] <<= 1;
 603
 604                         valid = (valid << 1) | (s[i] >> BC_COEF);
 605                 }
 606
 607                 valid |= PRP_RZ_VALID_TBL_LEN(len);
 608
 609                 if (pcdev->resizing[dir].algo == RESIZE_ALGO_BILINEAR)
 610                         valid |= PRP_RZ_VALID_BILINEAR;
 611
 612                 if (pcdev->emma_prp->cfg.channel == 1) {
 613                         if (dir == RESIZE_DIR_H) {
 614                                 writel(coeff[0], pcdev->base_emma +
 615                                                         PRP_CH1_RZ_HORI_COEF1);
 616                                 writel(coeff[1], pcdev->base_emma +
 617                                                         PRP_CH1_RZ_HORI_COEF2);
 618                                 writel(valid, pcdev->base_emma +
 619                                                         PRP_CH1_RZ_HORI_VALID);
 620                         } else {
 621                                 writel(coeff[0], pcdev->base_emma +
 622                                                         PRP_CH1_RZ_VERT_COEF1);
 623                                 writel(coeff[1], pcdev->base_emma +
 624                                                         PRP_CH1_RZ_VERT_COEF2);
 625                                 writel(valid, pcdev->base_emma +
 626                                                         PRP_CH1_RZ_VERT_VALID);
 627                         }
 628                 } else {
 629                         if (dir == RESIZE_DIR_H) {
 630                                 writel(coeff[0], pcdev->base_emma +
 631                                                         PRP_CH2_RZ_HORI_COEF1);
 632                                 writel(coeff[1], pcdev->base_emma +
 633                                                         PRP_CH2_RZ_HORI_COEF2);
 634                                 writel(valid, pcdev->base_emma +
 635                                                         PRP_CH2_RZ_HORI_VALID);
 636                         } else {
 637                                 writel(coeff[0], pcdev->base_emma +
 638                                                         PRP_CH2_RZ_VERT_COEF1);
 639                                 writel(coeff[1], pcdev->base_emma +
 640                                                         PRP_CH2_RZ_VERT_COEF2);
 641                                 writel(valid, pcdev->base_emma +
 642                                                         PRP_CH2_RZ_VERT_VALID);
 643                         }
 644                 }
 645         }
 646 }
 647
 648 static int mx2_start_streaming(struct vb2_queue *q, unsigned int count)
 649 {
 650         struct soc_camera_device *icd = soc_camera_from_vb2q(q);
 651         struct soc_camera_host *ici =
 652                 to_soc_camera_host(icd->parent);
 653         struct mx2_camera_dev *pcdev = ici->priv;
 654         struct mx2_fmt_cfg *prp = pcdev->emma_prp;
 655         struct vb2_buffer *vb;
 656         struct mx2_buffer *buf;
 657         unsigned long phys;
 658         int bytesperline;
 659         unsigned long flags;
 660
 661         if (count < 2)
 662                 return -ENOBUFS;
 663
 664         spin_lock_irqsave(&pcdev->lock, flags);
 665
 666         buf = list_first_entry(&pcdev->capture, struct mx2_buffer,
 667                                internal.queue);
 668         buf->internal.bufnum = 0;
 669         vb = &buf->vb.vb2_buf;
 670
 671         phys = vb2_dma_contig_plane_dma_addr(vb, 0);
 672         mx27_update_emma_buf(pcdev, phys, buf->internal.bufnum);
 673         list_move_tail(pcdev->capture.next, &pcdev->active_bufs);
 674
 675         buf = list_first_entry(&pcdev->capture, struct mx2_buffer,
 676                                internal.queue);
 677         buf->internal.bufnum = 1;
 678         vb = &buf->vb.vb2_buf;
 679
 680         phys = vb2_dma_contig_plane_dma_addr(vb, 0);
 681         mx27_update_emma_buf(pcdev, phys, buf->internal.bufnum);
 682         list_move_tail(pcdev->capture.next, &pcdev->active_bufs);
 683
 684         bytesperline = soc_mbus_bytes_per_line(icd->user_width,
 685                                                icd->current_fmt->host_fmt);
 686         if (bytesperline < 0) {
 687                 spin_unlock_irqrestore(&pcdev->lock, flags);
 688                 return bytesperline;
 689         }
 690
 691         /*
 692          * I didn't manage to properly enable/disable the prp
 693          * on a per frame basis during running transfers,
 694          * thus we allocate a buffer here and use it to
 695          * discard frames when no buffer is available.
 696          * Feel free to work on this ;)
 697          */
 698         pcdev->discard_size = icd->user_height * bytesperline;
 699         pcdev->discard_buffer = dma_alloc_coherent(ici->v4l2_dev.dev,
 700                                         pcdev->discard_size,
 701                                         &pcdev->discard_buffer_dma, GFP_ATOMIC);
 702         if (!pcdev->discard_buffer) {
 703                 spin_unlock_irqrestore(&pcdev->lock, flags);
 704                 return -ENOMEM;
 705         }
 706
 707         pcdev->buf_discard[0].discard = true;
 708         list_add_tail(&pcdev->buf_discard[0].queue,
 709                       &pcdev->discard);
 710
 711         pcdev->buf_discard[1].discard = true;
 712         list_add_tail(&pcdev->buf_discard[1].queue,
 713                       &pcdev->discard);
 714
 715         mx2_prp_resize_commit(pcdev);
 716
 717         mx27_camera_emma_buf_init(icd, bytesperline);
 718
 719         if (prp->cfg.channel == 1) {
 720                 writel(PRP_CNTL_CH1EN |
 721                        PRP_CNTL_CSIEN |
 722                        prp->cfg.in_fmt |
 723                        prp->cfg.out_fmt |
 724                        PRP_CNTL_CH1_LEN |
 725                        PRP_CNTL_CH1BYP |
 726                        PRP_CNTL_CH1_TSKIP(0) |
 727                        PRP_CNTL_IN_TSKIP(0),
 728                        pcdev->base_emma + PRP_CNTL);
 729         } else {
 730                 writel(PRP_CNTL_CH2EN |
 731                        PRP_CNTL_CSIEN |
 732                        prp->cfg.in_fmt |
 733                        prp->cfg.out_fmt |
 734                        PRP_CNTL_CH2_LEN |
 735                        PRP_CNTL_CH2_TSKIP(0) |
 736                        PRP_CNTL_IN_TSKIP(0),
 737                        pcdev->base_emma + PRP_CNTL);
 738         }
 739         spin_unlock_irqrestore(&pcdev->lock, flags);
 740
 741         return 0;
 742 }
 743
 744 static void mx2_stop_streaming(struct vb2_queue *q)
 745 {
 746         struct soc_camera_device *icd = soc_camera_from_vb2q(q);
 747         struct soc_camera_host *ici =
 748                 to_soc_camera_host(icd->parent);
 749         struct mx2_camera_dev *pcdev = ici->priv;
 750         struct mx2_fmt_cfg *prp = pcdev->emma_prp;
 751         unsigned long flags;
 752         void *b;
 753         u32 cntl;
 754
 755         spin_lock_irqsave(&pcdev->lock, flags);
 756
 757         cntl = readl(pcdev->base_emma + PRP_CNTL);
 758         if (prp->cfg.channel == 1) {
 759                 writel(cntl & ~PRP_CNTL_CH1EN,
 760                        pcdev->base_emma + PRP_CNTL);
 761         } else {
 762                 writel(cntl & ~PRP_CNTL_CH2EN,
 763                        pcdev->base_emma + PRP_CNTL);
 764         }
 765         INIT_LIST_HEAD(&pcdev->capture);
 766         INIT_LIST_HEAD(&pcdev->active_bufs);
 767         INIT_LIST_HEAD(&pcdev->discard);
 768
 769         b = pcdev->discard_buffer;
 770         pcdev->discard_buffer = NULL;
 771
 772         spin_unlock_irqrestore(&pcdev->lock, flags);
 773
 774         dma_free_coherent(ici->v4l2_dev.dev,
 775                           pcdev->discard_size, b, pcdev->discard_buffer_dma);
 776 }
 777
 778 static struct vb2_ops mx2_videobuf_ops = {
 779         .queue_setup     = mx2_videobuf_setup,
 780         .buf_prepare     = mx2_videobuf_prepare,
 781         .buf_queue       = mx2_videobuf_queue,
 782         .start_streaming = mx2_start_streaming,
 783         .stop_streaming  = mx2_stop_streaming,
 784 };
 785
 786 static int mx2_camera_init_videobuf(struct vb2_queue *q,
 787                               struct soc_camera_device *icd)
 788 {
 789         q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 790         q->io_modes = VB2_MMAP | VB2_USERPTR;
 791         q->drv_priv = icd;
 792         q->ops = &mx2_videobuf_ops;
 793         q->mem_ops = &vb2_dma_contig_memops;
 794         q->buf_struct_size = sizeof(struct mx2_buffer);
 795         q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
 796
 797         return vb2_queue_init(q);
 798 }
 799
 800 #define MX2_BUS_FLAGS   (V4L2_MBUS_MASTER | \
 801                         V4L2_MBUS_VSYNC_ACTIVE_HIGH | \
 802                         V4L2_MBUS_VSYNC_ACTIVE_LOW | \
 803                         V4L2_MBUS_HSYNC_ACTIVE_HIGH | \
 804                         V4L2_MBUS_HSYNC_ACTIVE_LOW | \
 805                         V4L2_MBUS_PCLK_SAMPLE_RISING | \
 806                         V4L2_MBUS_PCLK_SAMPLE_FALLING | \
 807                         V4L2_MBUS_DATA_ACTIVE_HIGH | \
 808                         V4L2_MBUS_DATA_ACTIVE_LOW)
 809
 810 static int mx27_camera_emma_prp_reset(struct mx2_camera_dev *pcdev)
 811 {
 812         int count = 0;
 813
 814         readl(pcdev->base_emma + PRP_CNTL);
 815         writel(PRP_CNTL_SWRST, pcdev->base_emma + PRP_CNTL);
 816         while (count++ < 100) {
 817                 if (!(readl(pcdev->base_emma + PRP_CNTL) & PRP_CNTL_SWRST))
 818                         return 0;
 819                 barrier();
 820                 udelay(1);
 821         }
 822
 823         return -ETIMEDOUT;
 824 }
 825
 826 static int mx2_camera_set_bus_param(struct soc_camera_device *icd)
 827 {
 828         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
 829         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 830         struct mx2_camera_dev *pcdev = ici->priv;
 831         struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
 832         unsigned long common_flags;
 833         int ret;
 834         int bytesperline;
 835         u32 csicr1 = pcdev->csicr1;
 836
 837         ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
 838         if (!ret) {
 839                 common_flags = soc_mbus_config_compatible(&cfg, MX2_BUS_FLAGS);
 840                 if (!common_flags) {
 841                         dev_warn(icd->parent,
 842                                  "Flags incompatible: camera 0x%x, host 0x%x\n",
 843                                  cfg.flags, MX2_BUS_FLAGS);
 844                         return -EINVAL;
 845                 }
 846         } else if (ret != -ENOIOCTLCMD) {
 847                 return ret;
 848         } else {
 849                 common_flags = MX2_BUS_FLAGS;
 850         }
 851
 852         if ((common_flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH) &&
 853             (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)) {
 854                 if (pcdev->platform_flags & MX2_CAMERA_HSYNC_HIGH)
 855                         common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_LOW;
 856                 else
 857                         common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_HIGH;
 858         }
 859
 860         if ((common_flags & V4L2_MBUS_PCLK_SAMPLE_RISING) &&
 861             (common_flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)) {
 862                 if (pcdev->platform_flags & MX2_CAMERA_PCLK_SAMPLE_RISING)
 863                         common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_FALLING;
 864                 else
 865                         common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_RISING;
 866         }
 867
 868         cfg.flags = common_flags;
 869         ret = v4l2_subdev_call(sd, video, s_mbus_config, &cfg);
 870         if (ret < 0 && ret != -ENOIOCTLCMD) {
 871                 dev_dbg(icd->parent, "camera s_mbus_config(0x%lx) returned %d\n",
 872                         common_flags, ret);
 873                 return ret;
 874         }
 875
 876         csicr1 = (csicr1 & ~CSICR1_FMT_MASK) | pcdev->emma_prp->cfg.csicr1;
 877
 878         if (common_flags & V4L2_MBUS_PCLK_SAMPLE_RISING)
 879                 csicr1 |= CSICR1_REDGE;
 880         if (common_flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH)
 881                 csicr1 |= CSICR1_SOF_POL;
 882         if (common_flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH)
 883                 csicr1 |= CSICR1_HSYNC_POL;
 884         if (pcdev->platform_flags & MX2_CAMERA_EXT_VSYNC)
 885                 csicr1 |= CSICR1_EXT_VSYNC;
 886         if (pcdev->platform_flags & MX2_CAMERA_CCIR)
 887                 csicr1 |= CSICR1_CCIR_EN;
 888         if (pcdev->platform_flags & MX2_CAMERA_CCIR_INTERLACE)
 889                 csicr1 |= CSICR1_CCIR_MODE;
 890         if (pcdev->platform_flags & MX2_CAMERA_GATED_CLOCK)
 891                 csicr1 |= CSICR1_GCLK_MODE;
 892         if (pcdev->platform_flags & MX2_CAMERA_INV_DATA)
 893                 csicr1 |= CSICR1_INV_DATA;
 894
 895         pcdev->csicr1 = csicr1;
 896
 897         bytesperline = soc_mbus_bytes_per_line(icd->user_width,
 898                         icd->current_fmt->host_fmt);
 899         if (bytesperline < 0)
 900                 return bytesperline;
 901
 902         ret = mx27_camera_emma_prp_reset(pcdev);
 903         if (ret)
 904                 return ret;
 905
 906         writel(pcdev->csicr1, pcdev->base_csi + CSICR1);
 907
 908         return 0;
 909 }
 910
 911 static int mx2_camera_set_crop(struct soc_camera_device *icd,
 912                                 const struct v4l2_crop *a)
 913 {
 914         struct v4l2_crop a_writable = *a;
 915         struct v4l2_rect *rect = &a_writable.c;
 916         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
 917         struct v4l2_subdev_format fmt = {
 918                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
 919         };
 920         struct v4l2_mbus_framefmt *mf = &fmt.format;
 921         int ret;
 922
 923         soc_camera_limit_side(&rect->left, &rect->width, 0, 2, 4096);
 924         soc_camera_limit_side(&rect->top, &rect->height, 0, 2, 4096);
 925
 926         ret = v4l2_subdev_call(sd, video, s_crop, a);
 927         if (ret < 0)
 928                 return ret;
 929
 930         /* The capture device might have changed its output  */
 931         ret = v4l2_subdev_call(sd, pad, get_fmt, NULL, &fmt);
 932         if (ret < 0)
 933                 return ret;
 934
 935         dev_dbg(icd->parent, "Sensor cropped %dx%d\n",
 936                 mf->width, mf->height);
 937
 938         icd->user_width         = mf->width;
 939         icd->user_height        = mf->height;
 940
 941         return ret;
 942 }
 943
 944 static int mx2_camera_get_formats(struct soc_camera_device *icd,
 945                                   unsigned int idx,
 946                                   struct soc_camera_format_xlate *xlate)
 947 {
 948         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
 949         const struct soc_mbus_pixelfmt *fmt;
 950         struct device *dev = icd->parent;
 951         struct v4l2_subdev_mbus_code_enum code = {
 952                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
 953                 .index = idx,
 954         };
 955         int ret, formats = 0;
 956
 957         ret = v4l2_subdev_call(sd, pad, enum_mbus_code, NULL, &code);
 958         if (ret < 0)
 959                 /* no more formats */
 960                 return 0;
 961
 962         fmt = soc_mbus_get_fmtdesc(code.code);
 963         if (!fmt) {
 964                 dev_err(dev, "Invalid format code #%u: %d\n", idx, code.code);
 965                 return 0;
 966         }
 967
 968         if (code.code == MEDIA_BUS_FMT_YUYV8_2X8 ||
 969             code.code == MEDIA_BUS_FMT_UYVY8_2X8) {
 970                 formats++;
 971                 if (xlate) {
 972                         /*
 973                          * CH2 can output YUV420 which is a standard format in
 974                          * soc_mediabus.c
 975                          */
 976                         xlate->host_fmt =
 977                                 soc_mbus_get_fmtdesc(MEDIA_BUS_FMT_YUYV8_1_5X8);
 978                         xlate->code     = code.code;
 979                         dev_dbg(dev, "Providing host format %s for sensor code %d\n",
 980                                xlate->host_fmt->name, code.code);
 981                         xlate++;
 982                 }
 983         }
 984
 985         if (code.code == MEDIA_BUS_FMT_UYVY8_2X8) {
 986                 formats++;
 987                 if (xlate) {
 988                         xlate->host_fmt =
 989                                 soc_mbus_get_fmtdesc(MEDIA_BUS_FMT_YUYV8_2X8);
 990                         xlate->code     = code.code;
 991                         dev_dbg(dev, "Providing host format %s for sensor code %d\n",
 992                                 xlate->host_fmt->name, code.code);
 993                         xlate++;
 994                 }
 995         }
 996
 997         /* Generic pass-trough */
 998         formats++;
 999         if (xlate) {
1000                 xlate->host_fmt = fmt;
1001                 xlate->code     = code.code;
1002                 xlate++;
1003         }
1004         return formats;
1005 }
1006
1007 static int mx2_emmaprp_resize(struct mx2_camera_dev *pcdev,
1008                               struct v4l2_mbus_framefmt *mf_in,
1009                               struct v4l2_pix_format *pix_out, bool apply)
1010 {
1011         unsigned int num, den;
1012         unsigned long m;
1013         int i, dir;
1014
1015         for (dir = RESIZE_DIR_H; dir <= RESIZE_DIR_V; dir++) {
1016                 struct emma_prp_resize tmprsz;
1017                 unsigned char *s = tmprsz.s;
1018                 int len = 0;
1019                 int in, out;
1020
1021                 if (dir == RESIZE_DIR_H) {
1022                         in = mf_in->width;
1023                         out = pix_out->width;
1024                 } else {
1025                         in = mf_in->height;
1026                         out = pix_out->height;
1027                 }
1028
1029                 if (in < out)
1030                         return -EINVAL;
1031                 else if (in == out)
1032                         continue;
1033
1034                 /* Calculate ratio */
1035                 m = gcd(in, out);
1036                 num = in / m;
1037                 den = out / m;
1038                 if (num > RESIZE_NUM_MAX)
1039                         return -EINVAL;
1040
1041                 if ((num >= 2 * den) && (den == 1) &&
1042                     (num < 9) && (!(num & 0x01))) {
1043                         int sum = 0;
1044                         int j;
1045
1046                         /* Average scaling for >= 2:1 ratios */
1047                         /* Support can be added for num >=9 and odd values */
1048
1049                         tmprsz.algo = RESIZE_ALGO_AVERAGING;
1050                         len = num;
1051
1052                         for (i = 0; i < (len / 2); i++)
1053                                 s[i] = 8;
1054
1055                         do {
1056                                 for (i = 0; i < (len / 2); i++) {
1057                                         s[i] = s[i] >> 1;
1058                                         sum = 0;
1059                                         for (j = 0; j < (len / 2); j++)
1060                                                 sum += s[j];
1061                                         if (sum == 4)
1062                                                 break;
1063                                 }
1064                         } while (sum != 4);
1065
1066                         for (i = (len / 2); i < len; i++)
1067                                 s[i] = s[len - i - 1];
1068
1069                         s[len - 1] |= SZ_COEF;
1070                 } else {
1071                         /* bilinear scaling for < 2:1 ratios */
1072                         int v; /* overflow counter */
1073                         int coeff, nxt; /* table output */
1074                         int in_pos_inc = 2 * den;
1075                         int out_pos = num;
1076                         int out_pos_inc = 2 * num;
1077                         int init_carry = num - den;
1078                         int carry = init_carry;
1079
1080                         tmprsz.algo = RESIZE_ALGO_BILINEAR;
1081                         v = den + in_pos_inc;
1082                         do {
1083                                 coeff = v - out_pos;
1084                                 out_pos += out_pos_inc;
1085                                 carry += out_pos_inc;
1086                                 for (nxt = 0; v < out_pos; nxt++) {
1087                                         v += in_pos_inc;
1088                                         carry -= in_pos_inc;
1089                                 }
1090
1091                                 if (len > RESIZE_NUM_MAX)
1092                                         return -EINVAL;
1093
1094                                 coeff = ((coeff << BC_COEF) +
1095                                         (in_pos_inc >> 1)) / in_pos_inc;
1096
1097                                 if (coeff >= (SZ_COEF - 1))
1098                                         coeff--;
1099
1100                                 coeff |= SZ_COEF;
1101                                 s[len] = (unsigned char)coeff;
1102                                 len++;
1103
1104                                 for (i = 1; i < nxt; i++) {
1105                                         if (len >= RESIZE_NUM_MAX)
1106                                                 return -EINVAL;
1107                                         s[len] = 0;
1108                                         len++;
1109                                 }
1110                         } while (carry != init_carry);
1111                 }
1112                 tmprsz.len = len;
1113                 if (dir == RESIZE_DIR_H)
1114                         mf_in->width = pix_out->width;
1115                 else
1116                         mf_in->height = pix_out->height;
1117
1118                 if (apply)
1119                         memcpy(&pcdev->resizing[dir], &tmprsz, sizeof(tmprsz));
1120         }
1121         return 0;
1122 }
1123
1124 static int mx2_camera_set_fmt(struct soc_camera_device *icd,
1125                                struct v4l2_format *f)
1126 {
1127         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1128         struct mx2_camera_dev *pcdev = ici->priv;
1129         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1130         const struct soc_camera_format_xlate *xlate;
1131         struct v4l2_pix_format *pix = &f->fmt.pix;
1132         struct v4l2_subdev_format format = {
1133                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1134         };
1135         struct v4l2_mbus_framefmt *mf = &format.format;
1136         int ret;
1137
1138         dev_dbg(icd->parent, "%s: requested params: width = %d, height = %d\n",
1139                 __func__, pix->width, pix->height);
1140
1141         xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
1142         if (!xlate) {
1143                 dev_warn(icd->parent, "Format %x not found\n",
1144                                 pix->pixelformat);
1145                 return -EINVAL;
1146         }
1147
1148         mf->width       = pix->width;
1149         mf->height      = pix->height;
1150         mf->field       = pix->field;
1151         mf->colorspace  = pix->colorspace;
1152         mf->code        = xlate->code;
1153
1154         ret = v4l2_subdev_call(sd, pad, set_fmt, NULL, &format);
1155         if (ret < 0 && ret != -ENOIOCTLCMD)
1156                 return ret;
1157
1158         /* Store width and height returned by the sensor for resizing */
1159         pcdev->s_width = mf->width;
1160         pcdev->s_height = mf->height;
1161         dev_dbg(icd->parent, "%s: sensor params: width = %d, height = %d\n",
1162                 __func__, pcdev->s_width, pcdev->s_height);
1163
1164         pcdev->emma_prp = mx27_emma_prp_get_format(xlate->code,
1165                                                    xlate->host_fmt->fourcc);
1166
1167         memset(pcdev->resizing, 0, sizeof(pcdev->resizing));
1168         if ((mf->width != pix->width || mf->height != pix->height) &&
1169                 pcdev->emma_prp->cfg.in_fmt == PRP_CNTL_DATA_IN_YUV422) {
1170                 if (mx2_emmaprp_resize(pcdev, mf, pix, true) < 0)
1171                         dev_dbg(icd->parent, "%s: can't resize\n", __func__);
1172         }
1173
1174         if (mf->code != xlate->code)
1175                 return -EINVAL;
1176
1177         pix->width              = mf->width;
1178         pix->height             = mf->height;
1179         pix->field              = mf->field;
1180         pix->colorspace         = mf->colorspace;
1181         icd->current_fmt        = xlate;
1182
1183         dev_dbg(icd->parent, "%s: returned params: width = %d, height = %d\n",
1184                 __func__, pix->width, pix->height);
1185
1186         return 0;
1187 }
1188
1189 static int mx2_camera_try_fmt(struct soc_camera_device *icd,
1190                                   struct v4l2_format *f)
1191 {
1192         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1193         const struct soc_camera_format_xlate *xlate;
1194         struct v4l2_pix_format *pix = &f->fmt.pix;
1195         struct v4l2_subdev_pad_config pad_cfg;
1196         struct v4l2_subdev_format format = {
1197                 .which = V4L2_SUBDEV_FORMAT_TRY,
1198         };
1199         struct v4l2_mbus_framefmt *mf = &format.format;
1200         __u32 pixfmt = pix->pixelformat;
1201         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1202         struct mx2_camera_dev *pcdev = ici->priv;
1203         struct mx2_fmt_cfg *emma_prp;
1204         int ret;
1205
1206         dev_dbg(icd->parent, "%s: requested params: width = %d, height = %d\n",
1207                 __func__, pix->width, pix->height);
1208
1209         xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1210         if (pixfmt && !xlate) {
1211                 dev_warn(icd->parent, "Format %x not found\n", pixfmt);
1212                 return -EINVAL;
1213         }
1214
1215         /*
1216          * limit to MX27 hardware capabilities: width must be a multiple of 8 as
1217          * requested by the CSI. (Table 39-2 in the i.MX27 Reference Manual).
1218          */
1219         pix->width &= ~0x7;
1220
1221         /* limit to sensor capabilities */
1222         mf->width       = pix->width;
1223         mf->height      = pix->height;
1224         mf->field       = pix->field;
1225         mf->colorspace  = pix->colorspace;
1226         mf->code        = xlate->code;
1227
1228         ret = v4l2_subdev_call(sd, pad, set_fmt, &pad_cfg, &format);
1229         if (ret < 0)
1230                 return ret;
1231
1232         dev_dbg(icd->parent, "%s: sensor params: width = %d, height = %d\n",
1233                 __func__, pcdev->s_width, pcdev->s_height);
1234
1235         /* If the sensor does not support image size try PrP resizing */
1236         emma_prp = mx27_emma_prp_get_format(xlate->code,
1237                                             xlate->host_fmt->fourcc);
1238
1239         if ((mf->width != pix->width || mf->height != pix->height) &&
1240                 emma_prp->cfg.in_fmt == PRP_CNTL_DATA_IN_YUV422) {
1241                 if (mx2_emmaprp_resize(pcdev, mf, pix, false) < 0)
1242                         dev_dbg(icd->parent, "%s: can't resize\n", __func__);
1243         }
1244
1245         if (mf->field == V4L2_FIELD_ANY)
1246                 mf->field = V4L2_FIELD_NONE;
1247         /*
1248          * Driver supports interlaced images provided they have
1249          * both fields so that they can be processed as if they
1250          * were progressive.
1251          */
1252         if (mf->field != V4L2_FIELD_NONE && !V4L2_FIELD_HAS_BOTH(mf->field)) {
1253                 dev_err(icd->parent, "Field type %d unsupported.\n",
1254                                 mf->field);
1255                 return -EINVAL;
1256         }
1257
1258         pix->width      = mf->width;
1259         pix->height     = mf->height;
1260         pix->field      = mf->field;
1261         pix->colorspace = mf->colorspace;
1262
1263         dev_dbg(icd->parent, "%s: returned params: width = %d, height = %d\n",
1264                 __func__, pix->width, pix->height);
1265
1266         return 0;
1267 }
1268
1269 static int mx2_camera_querycap(struct soc_camera_host *ici,
1270                                struct v4l2_capability *cap)
1271 {
1272         /* cap->name is set by the friendly caller:-> */
1273         strlcpy(cap->card, MX2_CAM_DRIVER_DESCRIPTION, sizeof(cap->card));
1274         cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
1275         cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
1276
1277         return 0;
1278 }
1279
1280 static unsigned int mx2_camera_poll(struct file *file, poll_table *pt)
1281 {
1282         struct soc_camera_device *icd = file->private_data;
1283
1284         return vb2_poll(&icd->vb2_vidq, file, pt);
1285 }
1286
1287 static struct soc_camera_host_ops mx2_soc_camera_host_ops = {
1288         .owner          = THIS_MODULE,
1289         .add            = mx2_camera_add_device,
1290         .remove         = mx2_camera_remove_device,
1291         .clock_start    = mx2_camera_clock_start,
1292         .clock_stop     = mx2_camera_clock_stop,
1293         .set_fmt        = mx2_camera_set_fmt,
1294         .set_crop       = mx2_camera_set_crop,
1295         .get_formats    = mx2_camera_get_formats,
1296         .try_fmt        = mx2_camera_try_fmt,
1297         .init_videobuf2 = mx2_camera_init_videobuf,
1298         .poll           = mx2_camera_poll,
1299         .querycap       = mx2_camera_querycap,
1300         .set_bus_param  = mx2_camera_set_bus_param,
1301 };
1302
1303 static void mx27_camera_frame_done_emma(struct mx2_camera_dev *pcdev,
1304                 int bufnum, bool err)
1305 {
1306 #ifdef DEBUG
1307         struct mx2_fmt_cfg *prp = pcdev->emma_prp;
1308 #endif
1309         struct mx2_buf_internal *ibuf;
1310         struct mx2_buffer *buf;
1311         struct vb2_buffer *vb;
1312         struct vb2_v4l2_buffer *vbuf;
1313         unsigned long phys;
1314
1315         ibuf = list_first_entry(&pcdev->active_bufs, struct mx2_buf_internal,
1316                                queue);
1317
1318         BUG_ON(ibuf->bufnum != bufnum);
1319
1320         if (ibuf->discard) {
1321                 /*
1322                  * Discard buffer must not be returned to user space.
1323                  * Just return it to the discard queue.
1324                  */
1325                 list_move_tail(pcdev->active_bufs.next, &pcdev->discard);
1326         } else {
1327                 buf = mx2_ibuf_to_buf(ibuf);
1328
1329                 vb = &buf->vb.vb2_buf;
1330                 vbuf = to_vb2_v4l2_buffer(vb);
1331 #ifdef DEBUG
1332                 phys = vb2_dma_contig_plane_dma_addr(vb, 0);
1333                 if (prp->cfg.channel == 1) {
1334                         if (readl(pcdev->base_emma + PRP_DEST_RGB1_PTR +
1335                                 4 * bufnum) != phys) {
1336                                 dev_err(pcdev->dev, "%lx != %x\n", phys,
1337                                         readl(pcdev->base_emma +
1338                                         PRP_DEST_RGB1_PTR + 4 * bufnum));
1339                         }
1340                 } else {
1341                         if (readl(pcdev->base_emma + PRP_DEST_Y_PTR -
1342                                 0x14 * bufnum) != phys) {
1343                                 dev_err(pcdev->dev, "%lx != %x\n", phys,
1344                                         readl(pcdev->base_emma +
1345                                         PRP_DEST_Y_PTR - 0x14 * bufnum));
1346                         }
1347                 }
1348 #endif
1349                 dev_dbg(pcdev->dev, "%s (vb=0x%p) 0x%p %lu\n", __func__, vb,
1350                                 vb2_plane_vaddr(vb, 0),
1351                                 vb2_get_plane_payload(vb, 0));
1352
1353                 list_del_init(&buf->internal.queue);
1354                 v4l2_get_timestamp(&vbuf->timestamp);
1355                 vbuf->sequence = pcdev->frame_count;
1356                 if (err)
1357                         vb2_buffer_done(vb, VB2_BUF_STATE_ERROR);
1358                 else
1359                         vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
1360         }
1361
1362         pcdev->frame_count++;
1363
1364         if (list_empty(&pcdev->capture)) {
1365                 if (list_empty(&pcdev->discard)) {
1366                         dev_warn(pcdev->dev, "%s: trying to access empty discard list\n",
1367                                  __func__);
1368                         return;
1369                 }
1370
1371                 ibuf = list_first_entry(&pcdev->discard,
1372                                         struct mx2_buf_internal, queue);
1373                 ibuf->bufnum = bufnum;
1374
1375                 list_move_tail(pcdev->discard.next, &pcdev->active_bufs);
1376                 mx27_update_emma_buf(pcdev, pcdev->discard_buffer_dma, bufnum);
1377                 return;
1378         }
1379
1380         buf = list_first_entry(&pcdev->capture, struct mx2_buffer,
1381                                internal.queue);
1382
1383         buf->internal.bufnum = bufnum;
1384
1385         list_move_tail(pcdev->capture.next, &pcdev->active_bufs);
1386
1387         vb = &buf->vb.vb2_buf;
1388
1389         phys = vb2_dma_contig_plane_dma_addr(vb, 0);
1390         mx27_update_emma_buf(pcdev, phys, bufnum);
1391 }
1392
1393 static irqreturn_t mx27_camera_emma_irq(int irq_emma, void *data)
1394 {
1395         struct mx2_camera_dev *pcdev = data;
1396         unsigned int status = readl(pcdev->base_emma + PRP_INTRSTATUS);
1397         struct mx2_buf_internal *ibuf;
1398
1399         spin_lock(&pcdev->lock);
1400
1401         if (list_empty(&pcdev->active_bufs)) {
1402                 dev_warn(pcdev->dev, "%s: called while active list is empty\n",
1403                         __func__);
1404
1405                 if (!status) {
1406                         spin_unlock(&pcdev->lock);
1407                         return IRQ_NONE;
1408                 }
1409         }
1410
1411         if (status & (1 << 7)) { /* overflow */
1412                 u32 cntl = readl(pcdev->base_emma + PRP_CNTL);
1413                 writel(cntl & ~(PRP_CNTL_CH1EN | PRP_CNTL_CH2EN),
1414                        pcdev->base_emma + PRP_CNTL);
1415                 writel(cntl, pcdev->base_emma + PRP_CNTL);
1416
1417                 ibuf = list_first_entry(&pcdev->active_bufs,
1418                                         struct mx2_buf_internal, queue);
1419                 mx27_camera_frame_done_emma(pcdev,
1420                                         ibuf->bufnum, true);
1421
1422                 status &= ~(1 << 7);
1423         } else if (((status & (3 << 5)) == (3 << 5)) ||
1424                 ((status & (3 << 3)) == (3 << 3))) {
1425                 /*
1426                  * Both buffers have triggered, process the one we're expecting
1427                  * to first
1428                  */
1429                 ibuf = list_first_entry(&pcdev->active_bufs,
1430                                         struct mx2_buf_internal, queue);
1431                 mx27_camera_frame_done_emma(pcdev, ibuf->bufnum, false);
1432                 status &= ~(1 << (6 - ibuf->bufnum)); /* mark processed */
1433         } else if ((status & (1 << 6)) || (status & (1 << 4))) {
1434                 mx27_camera_frame_done_emma(pcdev, 0, false);
1435         } else if ((status & (1 << 5)) || (status & (1 << 3))) {
1436                 mx27_camera_frame_done_emma(pcdev, 1, false);
1437         }
1438
1439         spin_unlock(&pcdev->lock);
1440         writel(status, pcdev->base_emma + PRP_INTRSTATUS);
1441
1442         return IRQ_HANDLED;
1443 }
1444
1445 static int mx27_camera_emma_init(struct platform_device *pdev)
1446 {
1447         struct mx2_camera_dev *pcdev = platform_get_drvdata(pdev);
1448         struct resource *res_emma;
1449         int irq_emma;
1450         int err = 0;
1451
1452         res_emma = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1453         irq_emma = platform_get_irq(pdev, 1);
1454         if (!res_emma || !irq_emma) {
1455                 dev_err(pcdev->dev, "no EMMA resources\n");
1456                 err = -ENODEV;
1457                 goto out;
1458         }
1459
1460         pcdev->base_emma = devm_ioremap_resource(pcdev->dev, res_emma);
1461         if (IS_ERR(pcdev->base_emma)) {
1462                 err = PTR_ERR(pcdev->base_emma);
1463                 goto out;
1464         }
1465
1466         err = devm_request_irq(pcdev->dev, irq_emma, mx27_camera_emma_irq, 0,
1467                                MX2_CAM_DRV_NAME, pcdev);
1468         if (err) {
1469                 dev_err(pcdev->dev, "Camera EMMA interrupt register failed\n");
1470                 goto out;
1471         }
1472
1473         pcdev->clk_emma_ipg = devm_clk_get(pcdev->dev, "emma-ipg");
1474         if (IS_ERR(pcdev->clk_emma_ipg)) {
1475                 err = PTR_ERR(pcdev->clk_emma_ipg);
1476                 goto out;
1477         }
1478
1479         clk_prepare_enable(pcdev->clk_emma_ipg);
1480
1481         pcdev->clk_emma_ahb = devm_clk_get(pcdev->dev, "emma-ahb");
1482         if (IS_ERR(pcdev->clk_emma_ahb)) {
1483                 err = PTR_ERR(pcdev->clk_emma_ahb);
1484                 goto exit_clk_emma_ipg;
1485         }
1486
1487         clk_prepare_enable(pcdev->clk_emma_ahb);
1488
1489         err = mx27_camera_emma_prp_reset(pcdev);
1490         if (err)
1491                 goto exit_clk_emma_ahb;
1492
1493         return err;
1494
1495 exit_clk_emma_ahb:
1496         clk_disable_unprepare(pcdev->clk_emma_ahb);
1497 exit_clk_emma_ipg:
1498         clk_disable_unprepare(pcdev->clk_emma_ipg);
1499 out:
1500         return err;
1501 }
1502
1503 static int mx2_camera_probe(struct platform_device *pdev)
1504 {
1505         struct mx2_camera_dev *pcdev;
1506         struct resource *res_csi;
1507         int irq_csi;
1508         int err = 0;
1509
1510         dev_dbg(&pdev->dev, "initialising\n");
1511
1512         res_csi = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1513         irq_csi = platform_get_irq(pdev, 0);
1514         if (res_csi == NULL || irq_csi < 0) {
1515                 dev_err(&pdev->dev, "Missing platform resources data\n");
1516                 err = -ENODEV;
1517                 goto exit;
1518         }
1519
1520         pcdev = devm_kzalloc(&pdev->dev, sizeof(*pcdev), GFP_KERNEL);
1521         if (!pcdev) {
1522                 dev_err(&pdev->dev, "Could not allocate pcdev\n");
1523                 err = -ENOMEM;
1524                 goto exit;
1525         }
1526
1527         pcdev->clk_csi_ahb = devm_clk_get(&pdev->dev, "ahb");
1528         if (IS_ERR(pcdev->clk_csi_ahb)) {
1529                 dev_err(&pdev->dev, "Could not get csi ahb clock\n");
1530                 err = PTR_ERR(pcdev->clk_csi_ahb);
1531                 goto exit;
1532         }
1533
1534         pcdev->clk_csi_per = devm_clk_get(&pdev->dev, "per");
1535         if (IS_ERR(pcdev->clk_csi_per)) {
1536                 dev_err(&pdev->dev, "Could not get csi per clock\n");
1537                 err = PTR_ERR(pcdev->clk_csi_per);
1538                 goto exit;
1539         }
1540
1541         pcdev->pdata = pdev->dev.platform_data;
1542         if (pcdev->pdata) {
1543                 long rate;
1544
1545                 pcdev->platform_flags = pcdev->pdata->flags;
1546
1547                 rate = clk_round_rate(pcdev->clk_csi_per,
1548                                                 pcdev->pdata->clk * 2);
1549                 if (rate <= 0) {
1550                         err = -ENODEV;
1551                         goto exit;
1552                 }
1553                 err = clk_set_rate(pcdev->clk_csi_per, rate);
1554                 if (err < 0)
1555                         goto exit;
1556         }
1557
1558         INIT_LIST_HEAD(&pcdev->capture);
1559         INIT_LIST_HEAD(&pcdev->active_bufs);
1560         INIT_LIST_HEAD(&pcdev->discard);
1561         spin_lock_init(&pcdev->lock);
1562
1563         pcdev->base_csi = devm_ioremap_resource(&pdev->dev, res_csi);
1564         if (IS_ERR(pcdev->base_csi)) {
1565                 err = PTR_ERR(pcdev->base_csi);
1566                 goto exit;
1567         }
1568
1569         pcdev->dev = &pdev->dev;
1570         platform_set_drvdata(pdev, pcdev);
1571
1572         err = mx27_camera_emma_init(pdev);
1573         if (err)
1574                 goto exit;
1575
1576         /*
1577          * We're done with drvdata here.  Clear the pointer so that
1578          * v4l2 core can start using drvdata on its purpose.
1579          */
1580         platform_set_drvdata(pdev, NULL);
1581
1582         pcdev->soc_host.drv_name        = MX2_CAM_DRV_NAME,
1583         pcdev->soc_host.ops             = &mx2_soc_camera_host_ops,
1584         pcdev->soc_host.priv            = pcdev;
1585         pcdev->soc_host.v4l2_dev.dev    = &pdev->dev;
1586         pcdev->soc_host.nr              = pdev->id;
1587
1588         pcdev->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
1589         if (IS_ERR(pcdev->alloc_ctx)) {
1590                 err = PTR_ERR(pcdev->alloc_ctx);
1591                 goto eallocctx;
1592         }
1593         err = soc_camera_host_register(&pcdev->soc_host);
1594         if (err)
1595                 goto exit_free_emma;
1596
1597         dev_info(&pdev->dev, "MX2 Camera (CSI) driver probed, clock frequency: %ld\n",
1598                         clk_get_rate(pcdev->clk_csi_per));
1599
1600         return 0;
1601
1602 exit_free_emma:
1603         vb2_dma_contig_cleanup_ctx(pcdev->alloc_ctx);
1604 eallocctx:
1605         clk_disable_unprepare(pcdev->clk_emma_ipg);
1606         clk_disable_unprepare(pcdev->clk_emma_ahb);
1607 exit:
1608         return err;
1609 }
1610
1611 static int mx2_camera_remove(struct platform_device *pdev)
1612 {
1613         struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
1614         struct mx2_camera_dev *pcdev = container_of(soc_host,
1615                         struct mx2_camera_dev, soc_host);
1616
1617         soc_camera_host_unregister(&pcdev->soc_host);
1618
1619         vb2_dma_contig_cleanup_ctx(pcdev->alloc_ctx);
1620
1621         clk_disable_unprepare(pcdev->clk_emma_ipg);
1622         clk_disable_unprepare(pcdev->clk_emma_ahb);
1623
1624         dev_info(&pdev->dev, "MX2 Camera driver unloaded\n");
1625
1626         return 0;
1627 }
1628
1629 static struct platform_driver mx2_camera_driver = {
1630         .driver         = {
1631                 .name   = MX2_CAM_DRV_NAME,
1632         },
1633         .id_table       = mx2_camera_devtype,
1634         .remove         = mx2_camera_remove,
1635 };
1636
1637 module_platform_driver_probe(mx2_camera_driver, mx2_camera_probe);
1638
1639 MODULE_DESCRIPTION("i.MX27 SoC Camera Host driver");
1640 MODULE_AUTHOR("Sascha Hauer <sha@pengutronix.de>");
1641 MODULE_LICENSE("GPL");
1642 MODULE_VERSION(MX2_CAM_VERSION);