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-core.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         enum v4l2_mbus_pixelcode        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_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         = V4L2_MBUS_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         = V4L2_MBUS_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         = V4L2_MBUS_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         = V4L2_MBUS_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(
 370                                         enum v4l2_mbus_pixelcode in_fmt,
 371                                         u32 out_fmt)
 372 {
 373         int i;
 374
 375         for (i = 1; i < ARRAY_SIZE(mx27_emma_prp_table); i++)
 376                 if ((mx27_emma_prp_table[i].in_fmt == in_fmt) &&
 377                                 (mx27_emma_prp_table[i].out_fmt == out_fmt)) {
 378                         return &mx27_emma_prp_table[i];
 379                 }
 380         /* If no match return the most generic configuration */
 381         return &mx27_emma_prp_table[0];
 382 };
 383
 384 static void mx27_update_emma_buf(struct mx2_camera_dev *pcdev,
 385                                  unsigned long phys, int bufnum)
 386 {
 387         struct mx2_fmt_cfg *prp = pcdev->emma_prp;
 388
 389         if (prp->cfg.channel == 1) {
 390                 writel(phys, pcdev->base_emma +
 391                                 PRP_DEST_RGB1_PTR + 4 * bufnum);
 392         } else {
 393                 writel(phys, pcdev->base_emma +
 394                         PRP_DEST_Y_PTR - 0x14 * bufnum);
 395                 if (prp->out_fmt == V4L2_PIX_FMT_YUV420) {
 396                         u32 imgsize = pcdev->soc_host.icd->user_height *
 397                                         pcdev->soc_host.icd->user_width;
 398
 399                         writel(phys + imgsize, pcdev->base_emma +
 400                                 PRP_DEST_CB_PTR - 0x14 * bufnum);
 401                         writel(phys + ((5 * imgsize) / 4), pcdev->base_emma +
 402                                 PRP_DEST_CR_PTR - 0x14 * bufnum);
 403                 }
 404         }
 405 }
 406
 407 static void mx2_camera_deactivate(struct mx2_camera_dev *pcdev)
 408 {
 409         clk_disable_unprepare(pcdev->clk_csi_ahb);
 410         clk_disable_unprepare(pcdev->clk_csi_per);
 411         writel(0, pcdev->base_csi + CSICR1);
 412         writel(0, pcdev->base_emma + PRP_CNTL);
 413 }
 414
 415 static int mx2_camera_add_device(struct soc_camera_device *icd)
 416 {
 417         dev_info(icd->parent, "Camera driver attached to camera %d\n",
 418                  icd->devnum);
 419
 420         return 0;
 421 }
 422
 423 static void mx2_camera_remove_device(struct soc_camera_device *icd)
 424 {
 425         dev_info(icd->parent, "Camera driver detached from camera %d\n",
 426                  icd->devnum);
 427 }
 428
 429 /*
 430  * The following two functions absolutely depend on the fact, that
 431  * there can be only one camera on mx2 camera sensor interface
 432  */
 433 static int mx2_camera_clock_start(struct soc_camera_host *ici)
 434 {
 435         struct mx2_camera_dev *pcdev = ici->priv;
 436         int ret;
 437         u32 csicr1;
 438
 439         ret = clk_prepare_enable(pcdev->clk_csi_ahb);
 440         if (ret < 0)
 441                 return ret;
 442
 443         ret = clk_prepare_enable(pcdev->clk_csi_per);
 444         if (ret < 0)
 445                 goto exit_csi_ahb;
 446
 447         csicr1 = CSICR1_MCLKEN | CSICR1_PRP_IF_EN | CSICR1_FCC |
 448                 CSICR1_RXFF_LEVEL(0);
 449
 450         pcdev->csicr1 = csicr1;
 451         writel(pcdev->csicr1, pcdev->base_csi + CSICR1);
 452
 453         pcdev->frame_count = 0;
 454
 455         return 0;
 456
 457 exit_csi_ahb:
 458         clk_disable_unprepare(pcdev->clk_csi_ahb);
 459
 460         return ret;
 461 }
 462
 463 static void mx2_camera_clock_stop(struct soc_camera_host *ici)
 464 {
 465         struct mx2_camera_dev *pcdev = ici->priv;
 466
 467         mx2_camera_deactivate(pcdev);
 468 }
 469
 470 /*
 471  *  Videobuf operations
 472  */
 473 static int mx2_videobuf_setup(struct vb2_queue *vq,
 474                         const struct v4l2_format *fmt,
 475                         unsigned int *count, unsigned int *num_planes,
 476                         unsigned int sizes[], void *alloc_ctxs[])
 477 {
 478         struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
 479         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 480         struct mx2_camera_dev *pcdev = ici->priv;
 481
 482         dev_dbg(icd->parent, "count=%d, size=%d\n", *count, sizes[0]);
 483
 484         /* TODO: support for VIDIOC_CREATE_BUFS not ready */
 485         if (fmt != NULL)
 486                 return -ENOTTY;
 487
 488         alloc_ctxs[0] = pcdev->alloc_ctx;
 489
 490         sizes[0] = icd->sizeimage;
 491
 492         if (0 == *count)
 493                 *count = 32;
 494         if (!*num_planes &&
 495             sizes[0] * *count > MAX_VIDEO_MEM * 1024 * 1024)
 496                 *count = (MAX_VIDEO_MEM * 1024 * 1024) / sizes[0];
 497
 498         *num_planes = 1;
 499
 500         return 0;
 501 }
 502
 503 static int mx2_videobuf_prepare(struct vb2_buffer *vb)
 504 {
 505         struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
 506         int ret = 0;
 507
 508         dev_dbg(icd->parent, "%s (vb=0x%p) 0x%p %lu\n", __func__,
 509                 vb, vb2_plane_vaddr(vb, 0), vb2_get_plane_payload(vb, 0));
 510
 511 #ifdef DEBUG
 512         /*
 513          * This can be useful if you want to see if we actually fill
 514          * the buffer with something
 515          */
 516         memset((void *)vb2_plane_vaddr(vb, 0),
 517                0xaa, vb2_get_plane_payload(vb, 0));
 518 #endif
 519
 520         vb2_set_plane_payload(vb, 0, icd->sizeimage);
 521         if (vb2_plane_vaddr(vb, 0) &&
 522             vb2_get_plane_payload(vb, 0) > vb2_plane_size(vb, 0)) {
 523                 ret = -EINVAL;
 524                 goto out;
 525         }
 526
 527         return 0;
 528
 529 out:
 530         return ret;
 531 }
 532
 533 static void mx2_videobuf_queue(struct vb2_buffer *vb)
 534 {
 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(vb, 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;
 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;
 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         u32 cntl;
 813         int count = 0;
 814
 815         cntl = readl(pcdev->base_emma + PRP_CNTL);
 816         writel(PRP_CNTL_SWRST, pcdev->base_emma + PRP_CNTL);
 817         while (count++ < 100) {
 818                 if (!(readl(pcdev->base_emma + PRP_CNTL) & PRP_CNTL_SWRST))
 819                         return 0;
 820                 barrier();
 821                 udelay(1);
 822         }
 823
 824         return -ETIMEDOUT;
 825 }
 826
 827 static int mx2_camera_set_bus_param(struct soc_camera_device *icd)
 828 {
 829         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
 830         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 831         struct mx2_camera_dev *pcdev = ici->priv;
 832         struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
 833         unsigned long common_flags;
 834         int ret;
 835         int bytesperline;
 836         u32 csicr1 = pcdev->csicr1;
 837
 838         ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
 839         if (!ret) {
 840                 common_flags = soc_mbus_config_compatible(&cfg, MX2_BUS_FLAGS);
 841                 if (!common_flags) {
 842                         dev_warn(icd->parent,
 843                                  "Flags incompatible: camera 0x%x, host 0x%x\n",
 844                                  cfg.flags, MX2_BUS_FLAGS);
 845                         return -EINVAL;
 846                 }
 847         } else if (ret != -ENOIOCTLCMD) {
 848                 return ret;
 849         } else {
 850                 common_flags = MX2_BUS_FLAGS;
 851         }
 852
 853         if ((common_flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH) &&
 854             (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)) {
 855                 if (pcdev->platform_flags & MX2_CAMERA_HSYNC_HIGH)
 856                         common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_LOW;
 857                 else
 858                         common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_HIGH;
 859         }
 860
 861         if ((common_flags & V4L2_MBUS_PCLK_SAMPLE_RISING) &&
 862             (common_flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)) {
 863                 if (pcdev->platform_flags & MX2_CAMERA_PCLK_SAMPLE_RISING)
 864                         common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_FALLING;
 865                 else
 866                         common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_RISING;
 867         }
 868
 869         cfg.flags = common_flags;
 870         ret = v4l2_subdev_call(sd, video, s_mbus_config, &cfg);
 871         if (ret < 0 && ret != -ENOIOCTLCMD) {
 872                 dev_dbg(icd->parent, "camera s_mbus_config(0x%lx) returned %d\n",
 873                         common_flags, ret);
 874                 return ret;
 875         }
 876
 877         csicr1 = (csicr1 & ~CSICR1_FMT_MASK) | pcdev->emma_prp->cfg.csicr1;
 878
 879         if (common_flags & V4L2_MBUS_PCLK_SAMPLE_RISING)
 880                 csicr1 |= CSICR1_REDGE;
 881         if (common_flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH)
 882                 csicr1 |= CSICR1_SOF_POL;
 883         if (common_flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH)
 884                 csicr1 |= CSICR1_HSYNC_POL;
 885         if (pcdev->platform_flags & MX2_CAMERA_EXT_VSYNC)
 886                 csicr1 |= CSICR1_EXT_VSYNC;
 887         if (pcdev->platform_flags & MX2_CAMERA_CCIR)
 888                 csicr1 |= CSICR1_CCIR_EN;
 889         if (pcdev->platform_flags & MX2_CAMERA_CCIR_INTERLACE)
 890                 csicr1 |= CSICR1_CCIR_MODE;
 891         if (pcdev->platform_flags & MX2_CAMERA_GATED_CLOCK)
 892                 csicr1 |= CSICR1_GCLK_MODE;
 893         if (pcdev->platform_flags & MX2_CAMERA_INV_DATA)
 894                 csicr1 |= CSICR1_INV_DATA;
 895
 896         pcdev->csicr1 = csicr1;
 897
 898         bytesperline = soc_mbus_bytes_per_line(icd->user_width,
 899                         icd->current_fmt->host_fmt);
 900         if (bytesperline < 0)
 901                 return bytesperline;
 902
 903         ret = mx27_camera_emma_prp_reset(pcdev);
 904         if (ret)
 905                 return ret;
 906
 907         writel(pcdev->csicr1, pcdev->base_csi + CSICR1);
 908
 909         return 0;
 910 }
 911
 912 static int mx2_camera_set_crop(struct soc_camera_device *icd,
 913                                 const struct v4l2_crop *a)
 914 {
 915         struct v4l2_crop a_writable = *a;
 916         struct v4l2_rect *rect = &a_writable.c;
 917         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
 918         struct v4l2_mbus_framefmt mf;
 919         int ret;
 920
 921         soc_camera_limit_side(&rect->left, &rect->width, 0, 2, 4096);
 922         soc_camera_limit_side(&rect->top, &rect->height, 0, 2, 4096);
 923
 924         ret = v4l2_subdev_call(sd, video, s_crop, a);
 925         if (ret < 0)
 926                 return ret;
 927
 928         /* The capture device might have changed its output  */
 929         ret = v4l2_subdev_call(sd, video, g_mbus_fmt, &mf);
 930         if (ret < 0)
 931                 return ret;
 932
 933         dev_dbg(icd->parent, "Sensor cropped %dx%d\n",
 934                 mf.width, mf.height);
 935
 936         icd->user_width         = mf.width;
 937         icd->user_height        = mf.height;
 938
 939         return ret;
 940 }
 941
 942 static int mx2_camera_get_formats(struct soc_camera_device *icd,
 943                                   unsigned int idx,
 944                                   struct soc_camera_format_xlate *xlate)
 945 {
 946         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
 947         const struct soc_mbus_pixelfmt *fmt;
 948         struct device *dev = icd->parent;
 949         enum v4l2_mbus_pixelcode code;
 950         int ret, formats = 0;
 951
 952         ret = v4l2_subdev_call(sd, video, enum_mbus_fmt, idx, &code);
 953         if (ret < 0)
 954                 /* no more formats */
 955                 return 0;
 956
 957         fmt = soc_mbus_get_fmtdesc(code);
 958         if (!fmt) {
 959                 dev_err(dev, "Invalid format code #%u: %d\n", idx, code);
 960                 return 0;
 961         }
 962
 963         if (code == V4L2_MBUS_FMT_YUYV8_2X8 ||
 964             code == V4L2_MBUS_FMT_UYVY8_2X8) {
 965                 formats++;
 966                 if (xlate) {
 967                         /*
 968                          * CH2 can output YUV420 which is a standard format in
 969                          * soc_mediabus.c
 970                          */
 971                         xlate->host_fmt =
 972                                 soc_mbus_get_fmtdesc(V4L2_MBUS_FMT_YUYV8_1_5X8);
 973                         xlate->code     = code;
 974                         dev_dbg(dev, "Providing host format %s for sensor code %d\n",
 975                                xlate->host_fmt->name, code);
 976                         xlate++;
 977                 }
 978         }
 979
 980         if (code == V4L2_MBUS_FMT_UYVY8_2X8) {
 981                 formats++;
 982                 if (xlate) {
 983                         xlate->host_fmt =
 984                                 soc_mbus_get_fmtdesc(V4L2_MBUS_FMT_YUYV8_2X8);
 985                         xlate->code     = code;
 986                         dev_dbg(dev, "Providing host format %s for sensor code %d\n",
 987                                 xlate->host_fmt->name, code);
 988                         xlate++;
 989                 }
 990         }
 991
 992         /* Generic pass-trough */
 993         formats++;
 994         if (xlate) {
 995                 xlate->host_fmt = fmt;
 996                 xlate->code     = code;
 997                 xlate++;
 998         }
 999         return formats;
1000 }
1001
1002 static int mx2_emmaprp_resize(struct mx2_camera_dev *pcdev,
1003                               struct v4l2_mbus_framefmt *mf_in,
1004                               struct v4l2_pix_format *pix_out, bool apply)
1005 {
1006         int num, den;
1007         unsigned long m;
1008         int i, dir;
1009
1010         for (dir = RESIZE_DIR_H; dir <= RESIZE_DIR_V; dir++) {
1011                 struct emma_prp_resize tmprsz;
1012                 unsigned char *s = tmprsz.s;
1013                 int len = 0;
1014                 int in, out;
1015
1016                 if (dir == RESIZE_DIR_H) {
1017                         in = mf_in->width;
1018                         out = pix_out->width;
1019                 } else {
1020                         in = mf_in->height;
1021                         out = pix_out->height;
1022                 }
1023
1024                 if (in < out)
1025                         return -EINVAL;
1026                 else if (in == out)
1027                         continue;
1028
1029                 /* Calculate ratio */
1030                 m = gcd(in, out);
1031                 num = in / m;
1032                 den = out / m;
1033                 if (num > RESIZE_NUM_MAX)
1034                         return -EINVAL;
1035
1036                 if ((num >= 2 * den) && (den == 1) &&
1037                     (num < 9) && (!(num & 0x01))) {
1038                         int sum = 0;
1039                         int j;
1040
1041                         /* Average scaling for >= 2:1 ratios */
1042                         /* Support can be added for num >=9 and odd values */
1043
1044                         tmprsz.algo = RESIZE_ALGO_AVERAGING;
1045                         len = num;
1046
1047                         for (i = 0; i < (len / 2); i++)
1048                                 s[i] = 8;
1049
1050                         do {
1051                                 for (i = 0; i < (len / 2); i++) {
1052                                         s[i] = s[i] >> 1;
1053                                         sum = 0;
1054                                         for (j = 0; j < (len / 2); j++)
1055                                                 sum += s[j];
1056                                         if (sum == 4)
1057                                                 break;
1058                                 }
1059                         } while (sum != 4);
1060
1061                         for (i = (len / 2); i < len; i++)
1062                                 s[i] = s[len - i - 1];
1063
1064                         s[len - 1] |= SZ_COEF;
1065                 } else {
1066                         /* bilinear scaling for < 2:1 ratios */
1067                         int v; /* overflow counter */
1068                         int coeff, nxt; /* table output */
1069                         int in_pos_inc = 2 * den;
1070                         int out_pos = num;
1071                         int out_pos_inc = 2 * num;
1072                         int init_carry = num - den;
1073                         int carry = init_carry;
1074
1075                         tmprsz.algo = RESIZE_ALGO_BILINEAR;
1076                         v = den + in_pos_inc;
1077                         do {
1078                                 coeff = v - out_pos;
1079                                 out_pos += out_pos_inc;
1080                                 carry += out_pos_inc;
1081                                 for (nxt = 0; v < out_pos; nxt++) {
1082                                         v += in_pos_inc;
1083                                         carry -= in_pos_inc;
1084                                 }
1085
1086                                 if (len > RESIZE_NUM_MAX)
1087                                         return -EINVAL;
1088
1089                                 coeff = ((coeff << BC_COEF) +
1090                                         (in_pos_inc >> 1)) / in_pos_inc;
1091
1092                                 if (coeff >= (SZ_COEF - 1))
1093                                         coeff--;
1094
1095                                 coeff |= SZ_COEF;
1096                                 s[len] = (unsigned char)coeff;
1097                                 len++;
1098
1099                                 for (i = 1; i < nxt; i++) {
1100                                         if (len >= RESIZE_NUM_MAX)
1101                                                 return -EINVAL;
1102                                         s[len] = 0;
1103                                         len++;
1104                                 }
1105                         } while (carry != init_carry);
1106                 }
1107                 tmprsz.len = len;
1108                 if (dir == RESIZE_DIR_H)
1109                         mf_in->width = pix_out->width;
1110                 else
1111                         mf_in->height = pix_out->height;
1112
1113                 if (apply)
1114                         memcpy(&pcdev->resizing[dir], &tmprsz, sizeof(tmprsz));
1115         }
1116         return 0;
1117 }
1118
1119 static int mx2_camera_set_fmt(struct soc_camera_device *icd,
1120                                struct v4l2_format *f)
1121 {
1122         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1123         struct mx2_camera_dev *pcdev = ici->priv;
1124         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1125         const struct soc_camera_format_xlate *xlate;
1126         struct v4l2_pix_format *pix = &f->fmt.pix;
1127         struct v4l2_mbus_framefmt mf;
1128         int ret;
1129
1130         dev_dbg(icd->parent, "%s: requested params: width = %d, height = %d\n",
1131                 __func__, pix->width, pix->height);
1132
1133         xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
1134         if (!xlate) {
1135                 dev_warn(icd->parent, "Format %x not found\n",
1136                                 pix->pixelformat);
1137                 return -EINVAL;
1138         }
1139
1140         mf.width        = pix->width;
1141         mf.height       = pix->height;
1142         mf.field        = pix->field;
1143         mf.colorspace   = pix->colorspace;
1144         mf.code         = xlate->code;
1145
1146         ret = v4l2_subdev_call(sd, video, s_mbus_fmt, &mf);
1147         if (ret < 0 && ret != -ENOIOCTLCMD)
1148                 return ret;
1149
1150         /* Store width and height returned by the sensor for resizing */
1151         pcdev->s_width = mf.width;
1152         pcdev->s_height = mf.height;
1153         dev_dbg(icd->parent, "%s: sensor params: width = %d, height = %d\n",
1154                 __func__, pcdev->s_width, pcdev->s_height);
1155
1156         pcdev->emma_prp = mx27_emma_prp_get_format(xlate->code,
1157                                                    xlate->host_fmt->fourcc);
1158
1159         memset(pcdev->resizing, 0, sizeof(pcdev->resizing));
1160         if ((mf.width != pix->width || mf.height != pix->height) &&
1161                 pcdev->emma_prp->cfg.in_fmt == PRP_CNTL_DATA_IN_YUV422) {
1162                 if (mx2_emmaprp_resize(pcdev, &mf, pix, true) < 0)
1163                         dev_dbg(icd->parent, "%s: can't resize\n", __func__);
1164         }
1165
1166         if (mf.code != xlate->code)
1167                 return -EINVAL;
1168
1169         pix->width              = mf.width;
1170         pix->height             = mf.height;
1171         pix->field              = mf.field;
1172         pix->colorspace         = mf.colorspace;
1173         icd->current_fmt        = xlate;
1174
1175         dev_dbg(icd->parent, "%s: returned params: width = %d, height = %d\n",
1176                 __func__, pix->width, pix->height);
1177
1178         return 0;
1179 }
1180
1181 static int mx2_camera_try_fmt(struct soc_camera_device *icd,
1182                                   struct v4l2_format *f)
1183 {
1184         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1185         const struct soc_camera_format_xlate *xlate;
1186         struct v4l2_pix_format *pix = &f->fmt.pix;
1187         struct v4l2_mbus_framefmt mf;
1188         __u32 pixfmt = pix->pixelformat;
1189         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1190         struct mx2_camera_dev *pcdev = ici->priv;
1191         struct mx2_fmt_cfg *emma_prp;
1192         int ret;
1193
1194         dev_dbg(icd->parent, "%s: requested params: width = %d, height = %d\n",
1195                 __func__, pix->width, pix->height);
1196
1197         xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1198         if (pixfmt && !xlate) {
1199                 dev_warn(icd->parent, "Format %x not found\n", pixfmt);
1200                 return -EINVAL;
1201         }
1202
1203         /*
1204          * limit to MX27 hardware capabilities: width must be a multiple of 8 as
1205          * requested by the CSI. (Table 39-2 in the i.MX27 Reference Manual).
1206          */
1207         pix->width &= ~0x7;
1208
1209         /* limit to sensor capabilities */
1210         mf.width        = pix->width;
1211         mf.height       = pix->height;
1212         mf.field        = pix->field;
1213         mf.colorspace   = pix->colorspace;
1214         mf.code         = xlate->code;
1215
1216         ret = v4l2_subdev_call(sd, video, try_mbus_fmt, &mf);
1217         if (ret < 0)
1218                 return ret;
1219
1220         dev_dbg(icd->parent, "%s: sensor params: width = %d, height = %d\n",
1221                 __func__, pcdev->s_width, pcdev->s_height);
1222
1223         /* If the sensor does not support image size try PrP resizing */
1224         emma_prp = mx27_emma_prp_get_format(xlate->code,
1225                                             xlate->host_fmt->fourcc);
1226
1227         if ((mf.width != pix->width || mf.height != pix->height) &&
1228                 emma_prp->cfg.in_fmt == PRP_CNTL_DATA_IN_YUV422) {
1229                 if (mx2_emmaprp_resize(pcdev, &mf, pix, false) < 0)
1230                         dev_dbg(icd->parent, "%s: can't resize\n", __func__);
1231         }
1232
1233         if (mf.field == V4L2_FIELD_ANY)
1234                 mf.field = V4L2_FIELD_NONE;
1235         /*
1236          * Driver supports interlaced images provided they have
1237          * both fields so that they can be processed as if they
1238          * were progressive.
1239          */
1240         if (mf.field != V4L2_FIELD_NONE && !V4L2_FIELD_HAS_BOTH(mf.field)) {
1241                 dev_err(icd->parent, "Field type %d unsupported.\n",
1242                                 mf.field);
1243                 return -EINVAL;
1244         }
1245
1246         pix->width      = mf.width;
1247         pix->height     = mf.height;
1248         pix->field      = mf.field;
1249         pix->colorspace = mf.colorspace;
1250
1251         dev_dbg(icd->parent, "%s: returned params: width = %d, height = %d\n",
1252                 __func__, pix->width, pix->height);
1253
1254         return 0;
1255 }
1256
1257 static int mx2_camera_querycap(struct soc_camera_host *ici,
1258                                struct v4l2_capability *cap)
1259 {
1260         /* cap->name is set by the friendly caller:-> */
1261         strlcpy(cap->card, MX2_CAM_DRIVER_DESCRIPTION, sizeof(cap->card));
1262         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
1263
1264         return 0;
1265 }
1266
1267 static unsigned int mx2_camera_poll(struct file *file, poll_table *pt)
1268 {
1269         struct soc_camera_device *icd = file->private_data;
1270
1271         return vb2_poll(&icd->vb2_vidq, file, pt);
1272 }
1273
1274 static struct soc_camera_host_ops mx2_soc_camera_host_ops = {
1275         .owner          = THIS_MODULE,
1276         .add            = mx2_camera_add_device,
1277         .remove         = mx2_camera_remove_device,
1278         .clock_start    = mx2_camera_clock_start,
1279         .clock_stop     = mx2_camera_clock_stop,
1280         .set_fmt        = mx2_camera_set_fmt,
1281         .set_crop       = mx2_camera_set_crop,
1282         .get_formats    = mx2_camera_get_formats,
1283         .try_fmt        = mx2_camera_try_fmt,
1284         .init_videobuf2 = mx2_camera_init_videobuf,
1285         .poll           = mx2_camera_poll,
1286         .querycap       = mx2_camera_querycap,
1287         .set_bus_param  = mx2_camera_set_bus_param,
1288 };
1289
1290 static void mx27_camera_frame_done_emma(struct mx2_camera_dev *pcdev,
1291                 int bufnum, bool err)
1292 {
1293 #ifdef DEBUG
1294         struct mx2_fmt_cfg *prp = pcdev->emma_prp;
1295 #endif
1296         struct mx2_buf_internal *ibuf;
1297         struct mx2_buffer *buf;
1298         struct vb2_buffer *vb;
1299         unsigned long phys;
1300
1301         ibuf = list_first_entry(&pcdev->active_bufs, struct mx2_buf_internal,
1302                                queue);
1303
1304         BUG_ON(ibuf->bufnum != bufnum);
1305
1306         if (ibuf->discard) {
1307                 /*
1308                  * Discard buffer must not be returned to user space.
1309                  * Just return it to the discard queue.
1310                  */
1311                 list_move_tail(pcdev->active_bufs.next, &pcdev->discard);
1312         } else {
1313                 buf = mx2_ibuf_to_buf(ibuf);
1314
1315                 vb = &buf->vb;
1316 #ifdef DEBUG
1317                 phys = vb2_dma_contig_plane_dma_addr(vb, 0);
1318                 if (prp->cfg.channel == 1) {
1319                         if (readl(pcdev->base_emma + PRP_DEST_RGB1_PTR +
1320                                 4 * bufnum) != phys) {
1321                                 dev_err(pcdev->dev, "%lx != %x\n", phys,
1322                                         readl(pcdev->base_emma +
1323                                         PRP_DEST_RGB1_PTR + 4 * bufnum));
1324                         }
1325                 } else {
1326                         if (readl(pcdev->base_emma + PRP_DEST_Y_PTR -
1327                                 0x14 * bufnum) != phys) {
1328                                 dev_err(pcdev->dev, "%lx != %x\n", phys,
1329                                         readl(pcdev->base_emma +
1330                                         PRP_DEST_Y_PTR - 0x14 * bufnum));
1331                         }
1332                 }
1333 #endif
1334                 dev_dbg(pcdev->dev, "%s (vb=0x%p) 0x%p %lu\n", __func__, vb,
1335                                 vb2_plane_vaddr(vb, 0),
1336                                 vb2_get_plane_payload(vb, 0));
1337
1338                 list_del_init(&buf->internal.queue);
1339                 v4l2_get_timestamp(&vb->v4l2_buf.timestamp);
1340                 vb->v4l2_buf.sequence = pcdev->frame_count;
1341                 if (err)
1342                         vb2_buffer_done(vb, VB2_BUF_STATE_ERROR);
1343                 else
1344                         vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
1345         }
1346
1347         pcdev->frame_count++;
1348
1349         if (list_empty(&pcdev->capture)) {
1350                 if (list_empty(&pcdev->discard)) {
1351                         dev_warn(pcdev->dev, "%s: trying to access empty discard list\n",
1352                                  __func__);
1353                         return;
1354                 }
1355
1356                 ibuf = list_first_entry(&pcdev->discard,
1357                                         struct mx2_buf_internal, queue);
1358                 ibuf->bufnum = bufnum;
1359
1360                 list_move_tail(pcdev->discard.next, &pcdev->active_bufs);
1361                 mx27_update_emma_buf(pcdev, pcdev->discard_buffer_dma, bufnum);
1362                 return;
1363         }
1364
1365         buf = list_first_entry(&pcdev->capture, struct mx2_buffer,
1366                                internal.queue);
1367
1368         buf->internal.bufnum = bufnum;
1369
1370         list_move_tail(pcdev->capture.next, &pcdev->active_bufs);
1371
1372         vb = &buf->vb;
1373
1374         phys = vb2_dma_contig_plane_dma_addr(vb, 0);
1375         mx27_update_emma_buf(pcdev, phys, bufnum);
1376 }
1377
1378 static irqreturn_t mx27_camera_emma_irq(int irq_emma, void *data)
1379 {
1380         struct mx2_camera_dev *pcdev = data;
1381         unsigned int status = readl(pcdev->base_emma + PRP_INTRSTATUS);
1382         struct mx2_buf_internal *ibuf;
1383
1384         spin_lock(&pcdev->lock);
1385
1386         if (list_empty(&pcdev->active_bufs)) {
1387                 dev_warn(pcdev->dev, "%s: called while active list is empty\n",
1388                         __func__);
1389
1390                 if (!status) {
1391                         spin_unlock(&pcdev->lock);
1392                         return IRQ_NONE;
1393                 }
1394         }
1395
1396         if (status & (1 << 7)) { /* overflow */
1397                 u32 cntl = readl(pcdev->base_emma + PRP_CNTL);
1398                 writel(cntl & ~(PRP_CNTL_CH1EN | PRP_CNTL_CH2EN),
1399                        pcdev->base_emma + PRP_CNTL);
1400                 writel(cntl, pcdev->base_emma + PRP_CNTL);
1401
1402                 ibuf = list_first_entry(&pcdev->active_bufs,
1403                                         struct mx2_buf_internal, queue);
1404                 mx27_camera_frame_done_emma(pcdev,
1405                                         ibuf->bufnum, true);
1406
1407                 status &= ~(1 << 7);
1408         } else if (((status & (3 << 5)) == (3 << 5)) ||
1409                 ((status & (3 << 3)) == (3 << 3))) {
1410                 /*
1411                  * Both buffers have triggered, process the one we're expecting
1412                  * to first
1413                  */
1414                 ibuf = list_first_entry(&pcdev->active_bufs,
1415                                         struct mx2_buf_internal, queue);
1416                 mx27_camera_frame_done_emma(pcdev, ibuf->bufnum, false);
1417                 status &= ~(1 << (6 - ibuf->bufnum)); /* mark processed */
1418         } else if ((status & (1 << 6)) || (status & (1 << 4))) {
1419                 mx27_camera_frame_done_emma(pcdev, 0, false);
1420         } else if ((status & (1 << 5)) || (status & (1 << 3))) {
1421                 mx27_camera_frame_done_emma(pcdev, 1, false);
1422         }
1423
1424         spin_unlock(&pcdev->lock);
1425         writel(status, pcdev->base_emma + PRP_INTRSTATUS);
1426
1427         return IRQ_HANDLED;
1428 }
1429
1430 static int mx27_camera_emma_init(struct platform_device *pdev)
1431 {
1432         struct mx2_camera_dev *pcdev = platform_get_drvdata(pdev);
1433         struct resource *res_emma;
1434         int irq_emma;
1435         int err = 0;
1436
1437         res_emma = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1438         irq_emma = platform_get_irq(pdev, 1);
1439         if (!res_emma || !irq_emma) {
1440                 dev_err(pcdev->dev, "no EMMA resources\n");
1441                 err = -ENODEV;
1442                 goto out;
1443         }
1444
1445         pcdev->base_emma = devm_ioremap_resource(pcdev->dev, res_emma);
1446         if (IS_ERR(pcdev->base_emma)) {
1447                 err = PTR_ERR(pcdev->base_emma);
1448                 goto out;
1449         }
1450
1451         err = devm_request_irq(pcdev->dev, irq_emma, mx27_camera_emma_irq, 0,
1452                                MX2_CAM_DRV_NAME, pcdev);
1453         if (err) {
1454                 dev_err(pcdev->dev, "Camera EMMA interrupt register failed\n");
1455                 goto out;
1456         }
1457
1458         pcdev->clk_emma_ipg = devm_clk_get(pcdev->dev, "emma-ipg");
1459         if (IS_ERR(pcdev->clk_emma_ipg)) {
1460                 err = PTR_ERR(pcdev->clk_emma_ipg);
1461                 goto out;
1462         }
1463
1464         clk_prepare_enable(pcdev->clk_emma_ipg);
1465
1466         pcdev->clk_emma_ahb = devm_clk_get(pcdev->dev, "emma-ahb");
1467         if (IS_ERR(pcdev->clk_emma_ahb)) {
1468                 err = PTR_ERR(pcdev->clk_emma_ahb);
1469                 goto exit_clk_emma_ipg;
1470         }
1471
1472         clk_prepare_enable(pcdev->clk_emma_ahb);
1473
1474         err = mx27_camera_emma_prp_reset(pcdev);
1475         if (err)
1476                 goto exit_clk_emma_ahb;
1477
1478         return err;
1479
1480 exit_clk_emma_ahb:
1481         clk_disable_unprepare(pcdev->clk_emma_ahb);
1482 exit_clk_emma_ipg:
1483         clk_disable_unprepare(pcdev->clk_emma_ipg);
1484 out:
1485         return err;
1486 }
1487
1488 static int mx2_camera_probe(struct platform_device *pdev)
1489 {
1490         struct mx2_camera_dev *pcdev;
1491         struct resource *res_csi;
1492         int irq_csi;
1493         int err = 0;
1494
1495         dev_dbg(&pdev->dev, "initialising\n");
1496
1497         res_csi = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1498         irq_csi = platform_get_irq(pdev, 0);
1499         if (res_csi == NULL || irq_csi < 0) {
1500                 dev_err(&pdev->dev, "Missing platform resources data\n");
1501                 err = -ENODEV;
1502                 goto exit;
1503         }
1504
1505         pcdev = devm_kzalloc(&pdev->dev, sizeof(*pcdev), GFP_KERNEL);
1506         if (!pcdev) {
1507                 dev_err(&pdev->dev, "Could not allocate pcdev\n");
1508                 err = -ENOMEM;
1509                 goto exit;
1510         }
1511
1512         pcdev->clk_csi_ahb = devm_clk_get(&pdev->dev, "ahb");
1513         if (IS_ERR(pcdev->clk_csi_ahb)) {
1514                 dev_err(&pdev->dev, "Could not get csi ahb clock\n");
1515                 err = PTR_ERR(pcdev->clk_csi_ahb);
1516                 goto exit;
1517         }
1518
1519         pcdev->clk_csi_per = devm_clk_get(&pdev->dev, "per");
1520         if (IS_ERR(pcdev->clk_csi_per)) {
1521                 dev_err(&pdev->dev, "Could not get csi per clock\n");
1522                 err = PTR_ERR(pcdev->clk_csi_per);
1523                 goto exit;
1524         }
1525
1526         pcdev->pdata = pdev->dev.platform_data;
1527         if (pcdev->pdata) {
1528                 long rate;
1529
1530                 pcdev->platform_flags = pcdev->pdata->flags;
1531
1532                 rate = clk_round_rate(pcdev->clk_csi_per,
1533                                                 pcdev->pdata->clk * 2);
1534                 if (rate <= 0) {
1535                         err = -ENODEV;
1536                         goto exit;
1537                 }
1538                 err = clk_set_rate(pcdev->clk_csi_per, rate);
1539                 if (err < 0)
1540                         goto exit;
1541         }
1542
1543         INIT_LIST_HEAD(&pcdev->capture);
1544         INIT_LIST_HEAD(&pcdev->active_bufs);
1545         INIT_LIST_HEAD(&pcdev->discard);
1546         spin_lock_init(&pcdev->lock);
1547
1548         pcdev->base_csi = devm_ioremap_resource(&pdev->dev, res_csi);
1549         if (IS_ERR(pcdev->base_csi)) {
1550                 err = PTR_ERR(pcdev->base_csi);
1551                 goto exit;
1552         }
1553
1554         pcdev->dev = &pdev->dev;
1555         platform_set_drvdata(pdev, pcdev);
1556
1557         err = mx27_camera_emma_init(pdev);
1558         if (err)
1559                 goto exit;
1560
1561         /*
1562          * We're done with drvdata here.  Clear the pointer so that
1563          * v4l2 core can start using drvdata on its purpose.
1564          */
1565         platform_set_drvdata(pdev, NULL);
1566
1567         pcdev->soc_host.drv_name        = MX2_CAM_DRV_NAME,
1568         pcdev->soc_host.ops             = &mx2_soc_camera_host_ops,
1569         pcdev->soc_host.priv            = pcdev;
1570         pcdev->soc_host.v4l2_dev.dev    = &pdev->dev;
1571         pcdev->soc_host.nr              = pdev->id;
1572
1573         pcdev->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
1574         if (IS_ERR(pcdev->alloc_ctx)) {
1575                 err = PTR_ERR(pcdev->alloc_ctx);
1576                 goto eallocctx;
1577         }
1578         err = soc_camera_host_register(&pcdev->soc_host);
1579         if (err)
1580                 goto exit_free_emma;
1581
1582         dev_info(&pdev->dev, "MX2 Camera (CSI) driver probed, clock frequency: %ld\n",
1583                         clk_get_rate(pcdev->clk_csi_per));
1584
1585         return 0;
1586
1587 exit_free_emma:
1588         vb2_dma_contig_cleanup_ctx(pcdev->alloc_ctx);
1589 eallocctx:
1590         clk_disable_unprepare(pcdev->clk_emma_ipg);
1591         clk_disable_unprepare(pcdev->clk_emma_ahb);
1592 exit:
1593         return err;
1594 }
1595
1596 static int mx2_camera_remove(struct platform_device *pdev)
1597 {
1598         struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
1599         struct mx2_camera_dev *pcdev = container_of(soc_host,
1600                         struct mx2_camera_dev, soc_host);
1601
1602         soc_camera_host_unregister(&pcdev->soc_host);
1603
1604         vb2_dma_contig_cleanup_ctx(pcdev->alloc_ctx);
1605
1606         clk_disable_unprepare(pcdev->clk_emma_ipg);
1607         clk_disable_unprepare(pcdev->clk_emma_ahb);
1608
1609         dev_info(&pdev->dev, "MX2 Camera driver unloaded\n");
1610
1611         return 0;
1612 }
1613
1614 static struct platform_driver mx2_camera_driver = {
1615         .driver         = {
1616                 .name   = MX2_CAM_DRV_NAME,
1617         },
1618         .id_table       = mx2_camera_devtype,
1619         .remove         = mx2_camera_remove,
1620 };
1621
1622 module_platform_driver_probe(mx2_camera_driver, mx2_camera_probe);
1623
1624 MODULE_DESCRIPTION("i.MX27 SoC Camera Host driver");
1625 MODULE_AUTHOR("Sascha Hauer <sha@pengutronix.de>");
1626 MODULE_LICENSE("GPL");
1627 MODULE_VERSION(MX2_CAM_VERSION);