drivers/media/platform/s5p-fimc/mipi-csis.c

   1 /*
   2  * Samsung S5P/EXYNOS4 SoC series MIPI-CSI receiver driver
   3  *
   4  * Copyright (C) 2011 - 2012 Samsung Electronics Co., Ltd.
   5  * Sylwester Nawrocki <s.nawrocki@samsung.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/clk.h>
  13 #include <linux/delay.h>
  14 #include <linux/device.h>
  15 #include <linux/errno.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/io.h>
  18 #include <linux/irq.h>
  19 #include <linux/kernel.h>
  20 #include <linux/memory.h>
  21 #include <linux/module.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/pm_runtime.h>
  24 #include <linux/regulator/consumer.h>
  25 #include <linux/slab.h>
  26 #include <linux/spinlock.h>
  27 #include <linux/videodev2.h>
  28 #include <media/v4l2-subdev.h>
  29 #include <linux/platform_data/mipi-csis.h>
  30 #include "mipi-csis.h"
  31
  32 static int debug;
  33 module_param(debug, int, 0644);
  34 MODULE_PARM_DESC(debug, "Debug level (0-2)");
  35
  36 /* Register map definition */
  37
  38 /* CSIS global control */
  39 #define S5PCSIS_CTRL                    0x00
  40 #define S5PCSIS_CTRL_DPDN_DEFAULT       (0 << 31)
  41 #define S5PCSIS_CTRL_DPDN_SWAP          (1 << 31)
  42 #define S5PCSIS_CTRL_ALIGN_32BIT        (1 << 20)
  43 #define S5PCSIS_CTRL_UPDATE_SHADOW      (1 << 16)
  44 #define S5PCSIS_CTRL_WCLK_EXTCLK        (1 << 8)
  45 #define S5PCSIS_CTRL_RESET              (1 << 4)
  46 #define S5PCSIS_CTRL_ENABLE             (1 << 0)
  47
  48 /* D-PHY control */
  49 #define S5PCSIS_DPHYCTRL                0x04
  50 #define S5PCSIS_DPHYCTRL_HSS_MASK       (0x1f << 27)
  51 #define S5PCSIS_DPHYCTRL_ENABLE         (0x1f << 0)
  52
  53 #define S5PCSIS_CONFIG                  0x08
  54 #define S5PCSIS_CFG_FMT_YCBCR422_8BIT   (0x1e << 2)
  55 #define S5PCSIS_CFG_FMT_RAW8            (0x2a << 2)
  56 #define S5PCSIS_CFG_FMT_RAW10           (0x2b << 2)
  57 #define S5PCSIS_CFG_FMT_RAW12           (0x2c << 2)
  58 /* User defined formats, x = 1...4 */
  59 #define S5PCSIS_CFG_FMT_USER(x)         ((0x30 + x - 1) << 2)
  60 #define S5PCSIS_CFG_FMT_MASK            (0x3f << 2)
  61 #define S5PCSIS_CFG_NR_LANE_MASK        3
  62
  63 /* Interrupt mask */
  64 #define S5PCSIS_INTMSK                  0x10
  65 #define S5PCSIS_INTMSK_EN_ALL           0xf000103f
  66 #define S5PCSIS_INTMSK_EVEN_BEFORE      (1 << 31)
  67 #define S5PCSIS_INTMSK_EVEN_AFTER       (1 << 30)
  68 #define S5PCSIS_INTMSK_ODD_BEFORE       (1 << 29)
  69 #define S5PCSIS_INTMSK_ODD_AFTER        (1 << 28)
  70 #define S5PCSIS_INTMSK_ERR_SOT_HS       (1 << 12)
  71 #define S5PCSIS_INTMSK_ERR_LOST_FS      (1 << 5)
  72 #define S5PCSIS_INTMSK_ERR_LOST_FE      (1 << 4)
  73 #define S5PCSIS_INTMSK_ERR_OVER         (1 << 3)
  74 #define S5PCSIS_INTMSK_ERR_ECC          (1 << 2)
  75 #define S5PCSIS_INTMSK_ERR_CRC          (1 << 1)
  76 #define S5PCSIS_INTMSK_ERR_UNKNOWN      (1 << 0)
  77
  78 /* Interrupt source */
  79 #define S5PCSIS_INTSRC                  0x14
  80 #define S5PCSIS_INTSRC_EVEN_BEFORE      (1 << 31)
  81 #define S5PCSIS_INTSRC_EVEN_AFTER       (1 << 30)
  82 #define S5PCSIS_INTSRC_EVEN             (0x3 << 30)
  83 #define S5PCSIS_INTSRC_ODD_BEFORE       (1 << 29)
  84 #define S5PCSIS_INTSRC_ODD_AFTER        (1 << 28)
  85 #define S5PCSIS_INTSRC_ODD              (0x3 << 28)
  86 #define S5PCSIS_INTSRC_NON_IMAGE_DATA   (0xff << 28)
  87 #define S5PCSIS_INTSRC_ERR_SOT_HS       (0xf << 12)
  88 #define S5PCSIS_INTSRC_ERR_LOST_FS      (1 << 5)
  89 #define S5PCSIS_INTSRC_ERR_LOST_FE      (1 << 4)
  90 #define S5PCSIS_INTSRC_ERR_OVER         (1 << 3)
  91 #define S5PCSIS_INTSRC_ERR_ECC          (1 << 2)
  92 #define S5PCSIS_INTSRC_ERR_CRC          (1 << 1)
  93 #define S5PCSIS_INTSRC_ERR_UNKNOWN      (1 << 0)
  94 #define S5PCSIS_INTSRC_ERRORS           0xf03f
  95
  96 /* Pixel resolution */
  97 #define S5PCSIS_RESOL                   0x2c
  98 #define CSIS_MAX_PIX_WIDTH              0xffff
  99 #define CSIS_MAX_PIX_HEIGHT             0xffff
 100
 101 /* Non-image packet data buffers */
 102 #define S5PCSIS_PKTDATA_ODD             0x2000
 103 #define S5PCSIS_PKTDATA_EVEN            0x3000
 104 #define S5PCSIS_PKTDATA_SIZE            SZ_4K
 105
 106 enum {
 107         CSIS_CLK_MUX,
 108         CSIS_CLK_GATE,
 109 };
 110
 111 static char *csi_clock_name[] = {
 112         [CSIS_CLK_MUX]  = "sclk_csis",
 113         [CSIS_CLK_GATE] = "csis",
 114 };
 115 #define NUM_CSIS_CLOCKS ARRAY_SIZE(csi_clock_name)
 116
 117 static const char * const csis_supply_name[] = {
 118         "vddcore",  /* CSIS Core (1.0V, 1.1V or 1.2V) suppply */
 119         "vddio",    /* CSIS I/O and PLL (1.8V) supply */
 120 };
 121 #define CSIS_NUM_SUPPLIES ARRAY_SIZE(csis_supply_name)
 122
 123 enum {
 124         ST_POWERED      = 1,
 125         ST_STREAMING    = 2,
 126         ST_SUSPENDED    = 4,
 127 };
 128
 129 struct s5pcsis_event {
 130         u32 mask;
 131         const char * const name;
 132         unsigned int counter;
 133 };
 134
 135 static const struct s5pcsis_event s5pcsis_events[] = {
 136         /* Errors */
 137         { S5PCSIS_INTSRC_ERR_SOT_HS,    "SOT Error" },
 138         { S5PCSIS_INTSRC_ERR_LOST_FS,   "Lost Frame Start Error" },
 139         { S5PCSIS_INTSRC_ERR_LOST_FE,   "Lost Frame End Error" },
 140         { S5PCSIS_INTSRC_ERR_OVER,      "FIFO Overflow Error" },
 141         { S5PCSIS_INTSRC_ERR_ECC,       "ECC Error" },
 142         { S5PCSIS_INTSRC_ERR_CRC,       "CRC Error" },
 143         { S5PCSIS_INTSRC_ERR_UNKNOWN,   "Unknown Error" },
 144         /* Non-image data receive events */
 145         { S5PCSIS_INTSRC_EVEN_BEFORE,   "Non-image data before even frame" },
 146         { S5PCSIS_INTSRC_EVEN_AFTER,    "Non-image data after even frame" },
 147         { S5PCSIS_INTSRC_ODD_BEFORE,    "Non-image data before odd frame" },
 148         { S5PCSIS_INTSRC_ODD_AFTER,     "Non-image data after odd frame" },
 149 };
 150 #define S5PCSIS_NUM_EVENTS ARRAY_SIZE(s5pcsis_events)
 151
 152 struct csis_pktbuf {
 153         u32 *data;
 154         unsigned int len;
 155 };
 156
 157 /**
 158  * struct csis_state - the driver's internal state data structure
 159  * @lock: mutex serializing the subdev and power management operations,
 160  *        protecting @format and @flags members
 161  * @pads: CSIS pads array
 162  * @sd: v4l2_subdev associated with CSIS device instance
 163  * @index: the hardware instance index
 164  * @pdev: CSIS platform device
 165  * @regs: mmaped I/O registers memory
 166  * @supplies: CSIS regulator supplies
 167  * @clock: CSIS clocks
 168  * @irq: requested s5p-mipi-csis irq number
 169  * @flags: the state variable for power and streaming control
 170  * @csis_fmt: current CSIS pixel format
 171  * @format: common media bus format for the source and sink pad
 172  * @slock: spinlock protecting structure members below
 173  * @pkt_buf: the frame embedded (non-image) data buffer
 174  * @events: MIPI-CSIS event (error) counters
 175  */
 176 struct csis_state {
 177         struct mutex lock;
 178         struct media_pad pads[CSIS_PADS_NUM];
 179         struct v4l2_subdev sd;
 180         u8 index;
 181         struct platform_device *pdev;
 182         void __iomem *regs;
 183         struct regulator_bulk_data supplies[CSIS_NUM_SUPPLIES];
 184         struct clk *clock[NUM_CSIS_CLOCKS];
 185         int irq;
 186         u32 flags;
 187         const struct csis_pix_format *csis_fmt;
 188         struct v4l2_mbus_framefmt format;
 189
 190         struct spinlock slock;
 191         struct csis_pktbuf pkt_buf;
 192         struct s5pcsis_event events[S5PCSIS_NUM_EVENTS];
 193 };
 194
 195 /**
 196  * struct csis_pix_format - CSIS pixel format description
 197  * @pix_width_alignment: horizontal pixel alignment, width will be
 198  *                       multiple of 2^pix_width_alignment
 199  * @code: corresponding media bus code
 200  * @fmt_reg: S5PCSIS_CONFIG register value
 201  * @data_alignment: MIPI-CSI data alignment in bits
 202  */
 203 struct csis_pix_format {
 204         unsigned int pix_width_alignment;
 205         enum v4l2_mbus_pixelcode code;
 206         u32 fmt_reg;
 207         u8 data_alignment;
 208 };
 209
 210 static const struct csis_pix_format s5pcsis_formats[] = {
 211         {
 212                 .code = V4L2_MBUS_FMT_VYUY8_2X8,
 213                 .fmt_reg = S5PCSIS_CFG_FMT_YCBCR422_8BIT,
 214                 .data_alignment = 32,
 215         }, {
 216                 .code = V4L2_MBUS_FMT_JPEG_1X8,
 217                 .fmt_reg = S5PCSIS_CFG_FMT_USER(1),
 218                 .data_alignment = 32,
 219         }, {
 220                 .code = V4L2_MBUS_FMT_S5C_UYVY_JPEG_1X8,
 221                 .fmt_reg = S5PCSIS_CFG_FMT_USER(1),
 222                 .data_alignment = 32,
 223         }
 224 };
 225
 226 #define s5pcsis_write(__csis, __r, __v) writel(__v, __csis->regs + __r)
 227 #define s5pcsis_read(__csis, __r) readl(__csis->regs + __r)
 228
 229 static struct csis_state *sd_to_csis_state(struct v4l2_subdev *sdev)
 230 {
 231         return container_of(sdev, struct csis_state, sd);
 232 }
 233
 234 static const struct csis_pix_format *find_csis_format(
 235         struct v4l2_mbus_framefmt *mf)
 236 {
 237         int i;
 238
 239         for (i = 0; i < ARRAY_SIZE(s5pcsis_formats); i++)
 240                 if (mf->code == s5pcsis_formats[i].code)
 241                         return &s5pcsis_formats[i];
 242         return NULL;
 243 }
 244
 245 static void s5pcsis_enable_interrupts(struct csis_state *state, bool on)
 246 {
 247         u32 val = s5pcsis_read(state, S5PCSIS_INTMSK);
 248
 249         val = on ? val | S5PCSIS_INTMSK_EN_ALL :
 250                    val & ~S5PCSIS_INTMSK_EN_ALL;
 251         s5pcsis_write(state, S5PCSIS_INTMSK, val);
 252 }
 253
 254 static void s5pcsis_reset(struct csis_state *state)
 255 {
 256         u32 val = s5pcsis_read(state, S5PCSIS_CTRL);
 257
 258         s5pcsis_write(state, S5PCSIS_CTRL, val | S5PCSIS_CTRL_RESET);
 259         udelay(10);
 260 }
 261
 262 static void s5pcsis_system_enable(struct csis_state *state, int on)
 263 {
 264         u32 val;
 265
 266         val = s5pcsis_read(state, S5PCSIS_CTRL);
 267         if (on)
 268                 val |= S5PCSIS_CTRL_ENABLE;
 269         else
 270                 val &= ~S5PCSIS_CTRL_ENABLE;
 271         s5pcsis_write(state, S5PCSIS_CTRL, val);
 272
 273         val = s5pcsis_read(state, S5PCSIS_DPHYCTRL);
 274         if (on)
 275                 val |= S5PCSIS_DPHYCTRL_ENABLE;
 276         else
 277                 val &= ~S5PCSIS_DPHYCTRL_ENABLE;
 278         s5pcsis_write(state, S5PCSIS_DPHYCTRL, val);
 279 }
 280
 281 /* Called with the state.lock mutex held */
 282 static void __s5pcsis_set_format(struct csis_state *state)
 283 {
 284         struct v4l2_mbus_framefmt *mf = &state->format;
 285         u32 val;
 286
 287         v4l2_dbg(1, debug, &state->sd, "fmt: %#x, %d x %d\n",
 288                  mf->code, mf->width, mf->height);
 289
 290         /* Color format */
 291         val = s5pcsis_read(state, S5PCSIS_CONFIG);
 292         val = (val & ~S5PCSIS_CFG_FMT_MASK) | state->csis_fmt->fmt_reg;
 293         s5pcsis_write(state, S5PCSIS_CONFIG, val);
 294
 295         /* Pixel resolution */
 296         val = (mf->width << 16) | mf->height;
 297         s5pcsis_write(state, S5PCSIS_RESOL, val);
 298 }
 299
 300 static void s5pcsis_set_hsync_settle(struct csis_state *state, int settle)
 301 {
 302         u32 val = s5pcsis_read(state, S5PCSIS_DPHYCTRL);
 303
 304         val = (val & ~S5PCSIS_DPHYCTRL_HSS_MASK) | (settle << 27);
 305         s5pcsis_write(state, S5PCSIS_DPHYCTRL, val);
 306 }
 307
 308 static void s5pcsis_set_params(struct csis_state *state)
 309 {
 310         struct s5p_platform_mipi_csis *pdata = state->pdev->dev.platform_data;
 311         u32 val;
 312
 313         val = s5pcsis_read(state, S5PCSIS_CONFIG);
 314         val = (val & ~S5PCSIS_CFG_NR_LANE_MASK) | (pdata->lanes - 1);
 315         s5pcsis_write(state, S5PCSIS_CONFIG, val);
 316
 317         __s5pcsis_set_format(state);
 318         s5pcsis_set_hsync_settle(state, pdata->hs_settle);
 319
 320         val = s5pcsis_read(state, S5PCSIS_CTRL);
 321         if (state->csis_fmt->data_alignment == 32)
 322                 val |= S5PCSIS_CTRL_ALIGN_32BIT;
 323         else /* 24-bits */
 324                 val &= ~S5PCSIS_CTRL_ALIGN_32BIT;
 325
 326         val &= ~S5PCSIS_CTRL_WCLK_EXTCLK;
 327         if (pdata->wclk_source)
 328                 val |= S5PCSIS_CTRL_WCLK_EXTCLK;
 329         s5pcsis_write(state, S5PCSIS_CTRL, val);
 330
 331         /* Update the shadow register. */
 332         val = s5pcsis_read(state, S5PCSIS_CTRL);
 333         s5pcsis_write(state, S5PCSIS_CTRL, val | S5PCSIS_CTRL_UPDATE_SHADOW);
 334 }
 335
 336 static void s5pcsis_clk_put(struct csis_state *state)
 337 {
 338         int i;
 339
 340         for (i = 0; i < NUM_CSIS_CLOCKS; i++) {
 341                 if (IS_ERR_OR_NULL(state->clock[i]))
 342                         continue;
 343                 clk_unprepare(state->clock[i]);
 344                 clk_put(state->clock[i]);
 345                 state->clock[i] = NULL;
 346         }
 347 }
 348
 349 static int s5pcsis_clk_get(struct csis_state *state)
 350 {
 351         struct device *dev = &state->pdev->dev;
 352         int i, ret;
 353
 354         for (i = 0; i < NUM_CSIS_CLOCKS; i++) {
 355                 state->clock[i] = clk_get(dev, csi_clock_name[i]);
 356                 if (IS_ERR(state->clock[i]))
 357                         goto err;
 358                 ret = clk_prepare(state->clock[i]);
 359                 if (ret < 0) {
 360                         clk_put(state->clock[i]);
 361                         state->clock[i] = NULL;
 362                         goto err;
 363                 }
 364         }
 365         return 0;
 366 err:
 367         s5pcsis_clk_put(state);
 368         dev_err(dev, "failed to get clock: %s\n", csi_clock_name[i]);
 369         return -ENXIO;
 370 }
 371
 372 static void s5pcsis_start_stream(struct csis_state *state)
 373 {
 374         s5pcsis_reset(state);
 375         s5pcsis_set_params(state);
 376         s5pcsis_system_enable(state, true);
 377         s5pcsis_enable_interrupts(state, true);
 378 }
 379
 380 static void s5pcsis_stop_stream(struct csis_state *state)
 381 {
 382         s5pcsis_enable_interrupts(state, false);
 383         s5pcsis_system_enable(state, false);
 384 }
 385
 386 static void s5pcsis_clear_counters(struct csis_state *state)
 387 {
 388         unsigned long flags;
 389         int i;
 390
 391         spin_lock_irqsave(&state->slock, flags);
 392         for (i = 0; i < S5PCSIS_NUM_EVENTS; i++)
 393                 state->events[i].counter = 0;
 394         spin_unlock_irqrestore(&state->slock, flags);
 395 }
 396
 397 static void s5pcsis_log_counters(struct csis_state *state, bool non_errors)
 398 {
 399         int i = non_errors ? S5PCSIS_NUM_EVENTS : S5PCSIS_NUM_EVENTS - 4;
 400         unsigned long flags;
 401
 402         spin_lock_irqsave(&state->slock, flags);
 403
 404         for (i--; i >= 0; i--)
 405                 if (state->events[i].counter >= 0)
 406                         v4l2_info(&state->sd, "%s events: %d\n",
 407                                   state->events[i].name,
 408                                   state->events[i].counter);
 409
 410         spin_unlock_irqrestore(&state->slock, flags);
 411 }
 412
 413 /*
 414  * V4L2 subdev operations
 415  */
 416 static int s5pcsis_s_power(struct v4l2_subdev *sd, int on)
 417 {
 418         struct csis_state *state = sd_to_csis_state(sd);
 419         struct device *dev = &state->pdev->dev;
 420
 421         if (on)
 422                 return pm_runtime_get_sync(dev);
 423
 424         return pm_runtime_put_sync(dev);
 425 }
 426
 427 static int s5pcsis_s_stream(struct v4l2_subdev *sd, int enable)
 428 {
 429         struct csis_state *state = sd_to_csis_state(sd);
 430         int ret = 0;
 431
 432         v4l2_dbg(1, debug, sd, "%s: %d, state: 0x%x\n",
 433                  __func__, enable, state->flags);
 434
 435         if (enable) {
 436                 s5pcsis_clear_counters(state);
 437                 ret = pm_runtime_get_sync(&state->pdev->dev);
 438                 if (ret && ret != 1)
 439                         return ret;
 440         }
 441
 442         mutex_lock(&state->lock);
 443         if (enable) {
 444                 if (state->flags & ST_SUSPENDED) {
 445                         ret = -EBUSY;
 446                         goto unlock;
 447                 }
 448                 s5pcsis_start_stream(state);
 449                 state->flags |= ST_STREAMING;
 450         } else {
 451                 s5pcsis_stop_stream(state);
 452                 state->flags &= ~ST_STREAMING;
 453                 if (debug > 0)
 454                         s5pcsis_log_counters(state, true);
 455         }
 456 unlock:
 457         mutex_unlock(&state->lock);
 458         if (!enable)
 459                 pm_runtime_put(&state->pdev->dev);
 460
 461         return ret == 1 ? 0 : ret;
 462 }
 463
 464 static int s5pcsis_enum_mbus_code(struct v4l2_subdev *sd,
 465                                   struct v4l2_subdev_fh *fh,
 466                                   struct v4l2_subdev_mbus_code_enum *code)
 467 {
 468         if (code->index >= ARRAY_SIZE(s5pcsis_formats))
 469                 return -EINVAL;
 470
 471         code->code = s5pcsis_formats[code->index].code;
 472         return 0;
 473 }
 474
 475 static struct csis_pix_format const *s5pcsis_try_format(
 476         struct v4l2_mbus_framefmt *mf)
 477 {
 478         struct csis_pix_format const *csis_fmt;
 479
 480         csis_fmt = find_csis_format(mf);
 481         if (csis_fmt == NULL)
 482                 csis_fmt = &s5pcsis_formats[0];
 483
 484         mf->code = csis_fmt->code;
 485         v4l_bound_align_image(&mf->width, 1, CSIS_MAX_PIX_WIDTH,
 486                               csis_fmt->pix_width_alignment,
 487                               &mf->height, 1, CSIS_MAX_PIX_HEIGHT, 1,
 488                               0);
 489         return csis_fmt;
 490 }
 491
 492 static struct v4l2_mbus_framefmt *__s5pcsis_get_format(
 493                 struct csis_state *state, struct v4l2_subdev_fh *fh,
 494                 u32 pad, enum v4l2_subdev_format_whence which)
 495 {
 496         if (which == V4L2_SUBDEV_FORMAT_TRY)
 497                 return fh ? v4l2_subdev_get_try_format(fh, pad) : NULL;
 498
 499         return &state->format;
 500 }
 501
 502 static int s5pcsis_set_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
 503                            struct v4l2_subdev_format *fmt)
 504 {
 505         struct csis_state *state = sd_to_csis_state(sd);
 506         struct csis_pix_format const *csis_fmt;
 507         struct v4l2_mbus_framefmt *mf;
 508
 509         if (fmt->pad != CSIS_PAD_SOURCE && fmt->pad != CSIS_PAD_SINK)
 510                 return -EINVAL;
 511
 512         mf = __s5pcsis_get_format(state, fh, fmt->pad, fmt->which);
 513
 514         if (fmt->pad == CSIS_PAD_SOURCE) {
 515                 if (mf) {
 516                         mutex_lock(&state->lock);
 517                         fmt->format = *mf;
 518                         mutex_unlock(&state->lock);
 519                 }
 520                 return 0;
 521         }
 522         csis_fmt = s5pcsis_try_format(&fmt->format);
 523         if (mf) {
 524                 mutex_lock(&state->lock);
 525                 *mf = fmt->format;
 526                 if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE)
 527                         state->csis_fmt = csis_fmt;
 528                 mutex_unlock(&state->lock);
 529         }
 530         return 0;
 531 }
 532
 533 static int s5pcsis_get_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
 534                            struct v4l2_subdev_format *fmt)
 535 {
 536         struct csis_state *state = sd_to_csis_state(sd);
 537         struct v4l2_mbus_framefmt *mf;
 538
 539         if (fmt->pad != CSIS_PAD_SOURCE && fmt->pad != CSIS_PAD_SINK)
 540                 return -EINVAL;
 541
 542         mf = __s5pcsis_get_format(state, fh, fmt->pad, fmt->which);
 543         if (!mf)
 544                 return -EINVAL;
 545
 546         mutex_lock(&state->lock);
 547         fmt->format = *mf;
 548         mutex_unlock(&state->lock);
 549         return 0;
 550 }
 551
 552 static int s5pcsis_s_rx_buffer(struct v4l2_subdev *sd, void *buf,
 553                                unsigned int *size)
 554 {
 555         struct csis_state *state = sd_to_csis_state(sd);
 556         unsigned long flags;
 557
 558         *size = min_t(unsigned int, *size, S5PCSIS_PKTDATA_SIZE);
 559
 560         spin_lock_irqsave(&state->slock, flags);
 561         state->pkt_buf.data = buf;
 562         state->pkt_buf.len = *size;
 563         spin_unlock_irqrestore(&state->slock, flags);
 564
 565         return 0;
 566 }
 567
 568 static int s5pcsis_log_status(struct v4l2_subdev *sd)
 569 {
 570         struct csis_state *state = sd_to_csis_state(sd);
 571
 572         s5pcsis_log_counters(state, true);
 573         return 0;
 574 }
 575
 576 static int s5pcsis_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
 577 {
 578         struct v4l2_mbus_framefmt *format = v4l2_subdev_get_try_format(fh, 0);
 579
 580         format->colorspace = V4L2_COLORSPACE_JPEG;
 581         format->code = s5pcsis_formats[0].code;
 582         format->width = S5PCSIS_DEF_PIX_WIDTH;
 583         format->height = S5PCSIS_DEF_PIX_HEIGHT;
 584         format->field = V4L2_FIELD_NONE;
 585
 586         return 0;
 587 }
 588
 589 static const struct v4l2_subdev_internal_ops s5pcsis_sd_internal_ops = {
 590         .open = s5pcsis_open,
 591 };
 592
 593 static struct v4l2_subdev_core_ops s5pcsis_core_ops = {
 594         .s_power = s5pcsis_s_power,
 595         .log_status = s5pcsis_log_status,
 596 };
 597
 598 static struct v4l2_subdev_pad_ops s5pcsis_pad_ops = {
 599         .enum_mbus_code = s5pcsis_enum_mbus_code,
 600         .get_fmt = s5pcsis_get_fmt,
 601         .set_fmt = s5pcsis_set_fmt,
 602 };
 603
 604 static struct v4l2_subdev_video_ops s5pcsis_video_ops = {
 605         .s_rx_buffer = s5pcsis_s_rx_buffer,
 606         .s_stream = s5pcsis_s_stream,
 607 };
 608
 609 static struct v4l2_subdev_ops s5pcsis_subdev_ops = {
 610         .core = &s5pcsis_core_ops,
 611         .pad = &s5pcsis_pad_ops,
 612         .video = &s5pcsis_video_ops,
 613 };
 614
 615 static irqreturn_t s5pcsis_irq_handler(int irq, void *dev_id)
 616 {
 617         struct csis_state *state = dev_id;
 618         struct csis_pktbuf *pktbuf = &state->pkt_buf;
 619         unsigned long flags;
 620         u32 status;
 621
 622         status = s5pcsis_read(state, S5PCSIS_INTSRC);
 623         spin_lock_irqsave(&state->slock, flags);
 624
 625         if ((status & S5PCSIS_INTSRC_NON_IMAGE_DATA) && pktbuf->data) {
 626                 u32 offset;
 627
 628                 if (status & S5PCSIS_INTSRC_EVEN)
 629                         offset = S5PCSIS_PKTDATA_EVEN;
 630                 else
 631                         offset = S5PCSIS_PKTDATA_ODD;
 632
 633                 memcpy(pktbuf->data, state->regs + offset, pktbuf->len);
 634                 pktbuf->data = NULL;
 635                 rmb();
 636         }
 637
 638         /* Update the event/error counters */
 639         if ((status & S5PCSIS_INTSRC_ERRORS) || debug) {
 640                 int i;
 641                 for (i = 0; i < S5PCSIS_NUM_EVENTS; i++) {
 642                         if (!(status & state->events[i].mask))
 643                                 continue;
 644                         state->events[i].counter++;
 645                         v4l2_dbg(2, debug, &state->sd, "%s: %d\n",
 646                                  state->events[i].name,
 647                                  state->events[i].counter);
 648                 }
 649                 v4l2_dbg(2, debug, &state->sd, "status: %08x\n", status);
 650         }
 651         spin_unlock_irqrestore(&state->slock, flags);
 652
 653         s5pcsis_write(state, S5PCSIS_INTSRC, status);
 654         return IRQ_HANDLED;
 655 }
 656
 657 static int s5pcsis_probe(struct platform_device *pdev)
 658 {
 659         struct s5p_platform_mipi_csis *pdata;
 660         struct resource *mem_res;
 661         struct csis_state *state;
 662         int ret = -ENOMEM;
 663         int i;
 664
 665         state = devm_kzalloc(&pdev->dev, sizeof(*state), GFP_KERNEL);
 666         if (!state)
 667                 return -ENOMEM;
 668
 669         mutex_init(&state->lock);
 670         spin_lock_init(&state->slock);
 671
 672         state->pdev = pdev;
 673         state->index = max(0, pdev->id);
 674
 675         pdata = pdev->dev.platform_data;
 676         if (pdata == NULL) {
 677                 dev_err(&pdev->dev, "Platform data not fully specified\n");
 678                 return -EINVAL;
 679         }
 680
 681         if ((state->index == 1 && pdata->lanes > CSIS1_MAX_LANES) ||
 682             pdata->lanes > CSIS0_MAX_LANES) {
 683                 dev_err(&pdev->dev, "Unsupported number of data lanes: %d\n",
 684                         pdata->lanes);
 685                 return -EINVAL;
 686         }
 687
 688         mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 689         state->regs = devm_request_and_ioremap(&pdev->dev, mem_res);
 690         if (state->regs == NULL) {
 691                 dev_err(&pdev->dev, "Failed to request and remap io memory\n");
 692                 return -ENXIO;
 693         }
 694
 695         state->irq = platform_get_irq(pdev, 0);
 696         if (state->irq < 0) {
 697                 dev_err(&pdev->dev, "Failed to get irq\n");
 698                 return state->irq;
 699         }
 700
 701         for (i = 0; i < CSIS_NUM_SUPPLIES; i++)
 702                 state->supplies[i].supply = csis_supply_name[i];
 703
 704         ret = regulator_bulk_get(&pdev->dev, CSIS_NUM_SUPPLIES,
 705                                  state->supplies);
 706         if (ret)
 707                 return ret;
 708
 709         ret = s5pcsis_clk_get(state);
 710         if (ret)
 711                 goto e_clkput;
 712
 713         clk_enable(state->clock[CSIS_CLK_MUX]);
 714         if (pdata->clk_rate)
 715                 clk_set_rate(state->clock[CSIS_CLK_MUX], pdata->clk_rate);
 716         else
 717                 dev_WARN(&pdev->dev, "No clock frequency specified!\n");
 718
 719         ret = devm_request_irq(&pdev->dev, state->irq, s5pcsis_irq_handler,
 720                                0, dev_name(&pdev->dev), state);
 721         if (ret) {
 722                 dev_err(&pdev->dev, "Interrupt request failed\n");
 723                 goto e_regput;
 724         }
 725
 726         v4l2_subdev_init(&state->sd, &s5pcsis_subdev_ops);
 727         state->sd.owner = THIS_MODULE;
 728         strlcpy(state->sd.name, dev_name(&pdev->dev), sizeof(state->sd.name));
 729         state->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
 730         state->csis_fmt = &s5pcsis_formats[0];
 731
 732         state->format.code = s5pcsis_formats[0].code;
 733         state->format.width = S5PCSIS_DEF_PIX_WIDTH;
 734         state->format.height = S5PCSIS_DEF_PIX_HEIGHT;
 735
 736         state->pads[CSIS_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
 737         state->pads[CSIS_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
 738         ret = media_entity_init(&state->sd.entity,
 739                                 CSIS_PADS_NUM, state->pads, 0);
 740         if (ret < 0)
 741                 goto e_clkput;
 742
 743         /* This allows to retrieve the platform device id by the host driver */
 744         v4l2_set_subdevdata(&state->sd, pdev);
 745
 746         /* .. and a pointer to the subdev. */
 747         platform_set_drvdata(pdev, &state->sd);
 748
 749         memcpy(state->events, s5pcsis_events, sizeof(state->events));
 750
 751         pm_runtime_enable(&pdev->dev);
 752         return 0;
 753
 754 e_regput:
 755         regulator_bulk_free(CSIS_NUM_SUPPLIES, state->supplies);
 756 e_clkput:
 757         clk_disable(state->clock[CSIS_CLK_MUX]);
 758         s5pcsis_clk_put(state);
 759         return ret;
 760 }
 761
 762 static int s5pcsis_pm_suspend(struct device *dev, bool runtime)
 763 {
 764         struct platform_device *pdev = to_platform_device(dev);
 765         struct v4l2_subdev *sd = platform_get_drvdata(pdev);
 766         struct csis_state *state = sd_to_csis_state(sd);
 767         int ret = 0;
 768
 769         v4l2_dbg(1, debug, sd, "%s: flags: 0x%x\n",
 770                  __func__, state->flags);
 771
 772         mutex_lock(&state->lock);
 773         if (state->flags & ST_POWERED) {
 774                 s5pcsis_stop_stream(state);
 775                 ret = s5p_csis_phy_enable(state->index, false);
 776                 if (ret)
 777                         goto unlock;
 778                 ret = regulator_bulk_disable(CSIS_NUM_SUPPLIES,
 779                                              state->supplies);
 780                 if (ret)
 781                         goto unlock;
 782                 clk_disable(state->clock[CSIS_CLK_GATE]);
 783                 state->flags &= ~ST_POWERED;
 784                 if (!runtime)
 785                         state->flags |= ST_SUSPENDED;
 786         }
 787  unlock:
 788         mutex_unlock(&state->lock);
 789         return ret ? -EAGAIN : 0;
 790 }
 791
 792 static int s5pcsis_pm_resume(struct device *dev, bool runtime)
 793 {
 794         struct platform_device *pdev = to_platform_device(dev);
 795         struct v4l2_subdev *sd = platform_get_drvdata(pdev);
 796         struct csis_state *state = sd_to_csis_state(sd);
 797         int ret = 0;
 798
 799         v4l2_dbg(1, debug, sd, "%s: flags: 0x%x\n",
 800                  __func__, state->flags);
 801
 802         mutex_lock(&state->lock);
 803         if (!runtime && !(state->flags & ST_SUSPENDED))
 804                 goto unlock;
 805
 806         if (!(state->flags & ST_POWERED)) {
 807                 ret = regulator_bulk_enable(CSIS_NUM_SUPPLIES,
 808                                             state->supplies);
 809                 if (ret)
 810                         goto unlock;
 811                 ret = s5p_csis_phy_enable(state->index, true);
 812                 if (!ret) {
 813                         state->flags |= ST_POWERED;
 814                 } else {
 815                         regulator_bulk_disable(CSIS_NUM_SUPPLIES,
 816                                                state->supplies);
 817                         goto unlock;
 818                 }
 819                 clk_enable(state->clock[CSIS_CLK_GATE]);
 820         }
 821         if (state->flags & ST_STREAMING)
 822                 s5pcsis_start_stream(state);
 823
 824         state->flags &= ~ST_SUSPENDED;
 825  unlock:
 826         mutex_unlock(&state->lock);
 827         return ret ? -EAGAIN : 0;
 828 }
 829
 830 #ifdef CONFIG_PM_SLEEP
 831 static int s5pcsis_suspend(struct device *dev)
 832 {
 833         return s5pcsis_pm_suspend(dev, false);
 834 }
 835
 836 static int s5pcsis_resume(struct device *dev)
 837 {
 838         return s5pcsis_pm_resume(dev, false);
 839 }
 840 #endif
 841
 842 #ifdef CONFIG_PM_RUNTIME
 843 static int s5pcsis_runtime_suspend(struct device *dev)
 844 {
 845         return s5pcsis_pm_suspend(dev, true);
 846 }
 847
 848 static int s5pcsis_runtime_resume(struct device *dev)
 849 {
 850         return s5pcsis_pm_resume(dev, true);
 851 }
 852 #endif
 853
 854 static int s5pcsis_remove(struct platform_device *pdev)
 855 {
 856         struct v4l2_subdev *sd = platform_get_drvdata(pdev);
 857         struct csis_state *state = sd_to_csis_state(sd);
 858
 859         pm_runtime_disable(&pdev->dev);
 860         s5pcsis_pm_suspend(&pdev->dev, false);
 861         clk_disable(state->clock[CSIS_CLK_MUX]);
 862         pm_runtime_set_suspended(&pdev->dev);
 863         s5pcsis_clk_put(state);
 864         regulator_bulk_free(CSIS_NUM_SUPPLIES, state->supplies);
 865
 866         media_entity_cleanup(&state->sd.entity);
 867
 868         return 0;
 869 }
 870
 871 static const struct dev_pm_ops s5pcsis_pm_ops = {
 872         SET_RUNTIME_PM_OPS(s5pcsis_runtime_suspend, s5pcsis_runtime_resume,
 873                            NULL)
 874         SET_SYSTEM_SLEEP_PM_OPS(s5pcsis_suspend, s5pcsis_resume)
 875 };
 876
 877 static struct platform_driver s5pcsis_driver = {
 878         .probe          = s5pcsis_probe,
 879         .remove         = s5pcsis_remove,
 880         .driver         = {
 881                 .name   = CSIS_DRIVER_NAME,
 882                 .owner  = THIS_MODULE,
 883                 .pm     = &s5pcsis_pm_ops,
 884         },
 885 };
 886
 887 module_platform_driver(s5pcsis_driver);
 888
 889 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
 890 MODULE_DESCRIPTION("Samsung S5P/EXYNOS SoC MIPI-CSI2 receiver driver");
 891 MODULE_LICENSE("GPL");