kernel/drivers/media/platform/exynos4-is/mipi-csis.c

   1 /*
   2  * Samsung S5P/EXYNOS SoC series MIPI-CSI receiver driver
   3  *
   4  * Copyright (C) 2011 - 2013 Samsung Electronics Co., Ltd.
   5  * Author: 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/of.h>
  23 #include <linux/of_graph.h>
  24 #include <linux/phy/phy.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/pm_runtime.h>
  27 #include <linux/regulator/consumer.h>
  28 #include <linux/sizes.h>
  29 #include <linux/slab.h>
  30 #include <linux/spinlock.h>
  31 #include <linux/videodev2.h>
  32 #include <media/exynos-fimc.h>
  33 #include <media/v4l2-of.h>
  34 #include <media/v4l2-subdev.h>
  35
  36 #include "mipi-csis.h"
  37
  38 static int debug;
  39 module_param(debug, int, 0644);
  40 MODULE_PARM_DESC(debug, "Debug level (0-2)");
  41
  42 /* Register map definition */
  43
  44 /* CSIS global control */
  45 #define S5PCSIS_CTRL                    0x00
  46 #define S5PCSIS_CTRL_DPDN_DEFAULT       (0 << 31)
  47 #define S5PCSIS_CTRL_DPDN_SWAP          (1 << 31)
  48 #define S5PCSIS_CTRL_ALIGN_32BIT        (1 << 20)
  49 #define S5PCSIS_CTRL_UPDATE_SHADOW      (1 << 16)
  50 #define S5PCSIS_CTRL_WCLK_EXTCLK        (1 << 8)
  51 #define S5PCSIS_CTRL_RESET              (1 << 4)
  52 #define S5PCSIS_CTRL_ENABLE             (1 << 0)
  53
  54 /* D-PHY control */
  55 #define S5PCSIS_DPHYCTRL                0x04
  56 #define S5PCSIS_DPHYCTRL_HSS_MASK       (0x1f << 27)
  57 #define S5PCSIS_DPHYCTRL_ENABLE         (0x1f << 0)
  58
  59 #define S5PCSIS_CONFIG                  0x08
  60 #define S5PCSIS_CFG_FMT_YCBCR422_8BIT   (0x1e << 2)
  61 #define S5PCSIS_CFG_FMT_RAW8            (0x2a << 2)
  62 #define S5PCSIS_CFG_FMT_RAW10           (0x2b << 2)
  63 #define S5PCSIS_CFG_FMT_RAW12           (0x2c << 2)
  64 /* User defined formats, x = 1...4 */
  65 #define S5PCSIS_CFG_FMT_USER(x)         ((0x30 + x - 1) << 2)
  66 #define S5PCSIS_CFG_FMT_MASK            (0x3f << 2)
  67 #define S5PCSIS_CFG_NR_LANE_MASK        3
  68
  69 /* Interrupt mask */
  70 #define S5PCSIS_INTMSK                  0x10
  71 #define S5PCSIS_INTMSK_EVEN_BEFORE      (1 << 31)
  72 #define S5PCSIS_INTMSK_EVEN_AFTER       (1 << 30)
  73 #define S5PCSIS_INTMSK_ODD_BEFORE       (1 << 29)
  74 #define S5PCSIS_INTMSK_ODD_AFTER        (1 << 28)
  75 #define S5PCSIS_INTMSK_FRAME_START      (1 << 27)
  76 #define S5PCSIS_INTMSK_FRAME_END        (1 << 26)
  77 #define S5PCSIS_INTMSK_ERR_SOT_HS       (1 << 12)
  78 #define S5PCSIS_INTMSK_ERR_LOST_FS      (1 << 5)
  79 #define S5PCSIS_INTMSK_ERR_LOST_FE      (1 << 4)
  80 #define S5PCSIS_INTMSK_ERR_OVER         (1 << 3)
  81 #define S5PCSIS_INTMSK_ERR_ECC          (1 << 2)
  82 #define S5PCSIS_INTMSK_ERR_CRC          (1 << 1)
  83 #define S5PCSIS_INTMSK_ERR_UNKNOWN      (1 << 0)
  84 #define S5PCSIS_INTMSK_EXYNOS4_EN_ALL   0xf000103f
  85 #define S5PCSIS_INTMSK_EXYNOS5_EN_ALL   0xfc00103f
  86
  87 /* Interrupt source */
  88 #define S5PCSIS_INTSRC                  0x14
  89 #define S5PCSIS_INTSRC_EVEN_BEFORE      (1 << 31)
  90 #define S5PCSIS_INTSRC_EVEN_AFTER       (1 << 30)
  91 #define S5PCSIS_INTSRC_EVEN             (0x3 << 30)
  92 #define S5PCSIS_INTSRC_ODD_BEFORE       (1 << 29)
  93 #define S5PCSIS_INTSRC_ODD_AFTER        (1 << 28)
  94 #define S5PCSIS_INTSRC_ODD              (0x3 << 28)
  95 #define S5PCSIS_INTSRC_NON_IMAGE_DATA   (0xf << 28)
  96 #define S5PCSIS_INTSRC_FRAME_START      (1 << 27)
  97 #define S5PCSIS_INTSRC_FRAME_END        (1 << 26)
  98 #define S5PCSIS_INTSRC_ERR_SOT_HS       (0xf << 12)
  99 #define S5PCSIS_INTSRC_ERR_LOST_FS      (1 << 5)
 100 #define S5PCSIS_INTSRC_ERR_LOST_FE      (1 << 4)
 101 #define S5PCSIS_INTSRC_ERR_OVER         (1 << 3)
 102 #define S5PCSIS_INTSRC_ERR_ECC          (1 << 2)
 103 #define S5PCSIS_INTSRC_ERR_CRC          (1 << 1)
 104 #define S5PCSIS_INTSRC_ERR_UNKNOWN      (1 << 0)
 105 #define S5PCSIS_INTSRC_ERRORS           0xf03f
 106
 107 /* Pixel resolution */
 108 #define S5PCSIS_RESOL                   0x2c
 109 #define CSIS_MAX_PIX_WIDTH              0xffff
 110 #define CSIS_MAX_PIX_HEIGHT             0xffff
 111
 112 /* Non-image packet data buffers */
 113 #define S5PCSIS_PKTDATA_ODD             0x2000
 114 #define S5PCSIS_PKTDATA_EVEN            0x3000
 115 #define S5PCSIS_PKTDATA_SIZE            SZ_4K
 116
 117 enum {
 118         CSIS_CLK_MUX,
 119         CSIS_CLK_GATE,
 120 };
 121
 122 static char *csi_clock_name[] = {
 123         [CSIS_CLK_MUX]  = "sclk_csis",
 124         [CSIS_CLK_GATE] = "csis",
 125 };
 126 #define NUM_CSIS_CLOCKS ARRAY_SIZE(csi_clock_name)
 127 #define DEFAULT_SCLK_CSIS_FREQ  166000000UL
 128
 129 static const char * const csis_supply_name[] = {
 130         "vddcore",  /* CSIS Core (1.0V, 1.1V or 1.2V) suppply */
 131         "vddio",    /* CSIS I/O and PLL (1.8V) supply */
 132 };
 133 #define CSIS_NUM_SUPPLIES ARRAY_SIZE(csis_supply_name)
 134
 135 enum {
 136         ST_POWERED      = 1,
 137         ST_STREAMING    = 2,
 138         ST_SUSPENDED    = 4,
 139 };
 140
 141 struct s5pcsis_event {
 142         u32 mask;
 143         const char * const name;
 144         unsigned int counter;
 145 };
 146
 147 static const struct s5pcsis_event s5pcsis_events[] = {
 148         /* Errors */
 149         { S5PCSIS_INTSRC_ERR_SOT_HS,    "SOT Error" },
 150         { S5PCSIS_INTSRC_ERR_LOST_FS,   "Lost Frame Start Error" },
 151         { S5PCSIS_INTSRC_ERR_LOST_FE,   "Lost Frame End Error" },
 152         { S5PCSIS_INTSRC_ERR_OVER,      "FIFO Overflow Error" },
 153         { S5PCSIS_INTSRC_ERR_ECC,       "ECC Error" },
 154         { S5PCSIS_INTSRC_ERR_CRC,       "CRC Error" },
 155         { S5PCSIS_INTSRC_ERR_UNKNOWN,   "Unknown Error" },
 156         /* Non-image data receive events */
 157         { S5PCSIS_INTSRC_EVEN_BEFORE,   "Non-image data before even frame" },
 158         { S5PCSIS_INTSRC_EVEN_AFTER,    "Non-image data after even frame" },
 159         { S5PCSIS_INTSRC_ODD_BEFORE,    "Non-image data before odd frame" },
 160         { S5PCSIS_INTSRC_ODD_AFTER,     "Non-image data after odd frame" },
 161         /* Frame start/end */
 162         { S5PCSIS_INTSRC_FRAME_START,   "Frame Start" },
 163         { S5PCSIS_INTSRC_FRAME_END,     "Frame End" },
 164 };
 165 #define S5PCSIS_NUM_EVENTS ARRAY_SIZE(s5pcsis_events)
 166
 167 struct csis_pktbuf {
 168         u32 *data;
 169         unsigned int len;
 170 };
 171
 172 struct csis_drvdata {
 173         /* Mask of all used interrupts in S5PCSIS_INTMSK register */
 174         u32 interrupt_mask;
 175 };
 176
 177 /**
 178  * struct csis_state - the driver's internal state data structure
 179  * @lock: mutex serializing the subdev and power management operations,
 180  *        protecting @format and @flags members
 181  * @pads: CSIS pads array
 182  * @sd: v4l2_subdev associated with CSIS device instance
 183  * @index: the hardware instance index
 184  * @pdev: CSIS platform device
 185  * @phy: pointer to the CSIS generic PHY
 186  * @regs: mmaped I/O registers memory
 187  * @supplies: CSIS regulator supplies
 188  * @clock: CSIS clocks
 189  * @irq: requested s5p-mipi-csis irq number
 190  * @interrupt_mask: interrupt mask of the all used interrupts
 191  * @flags: the state variable for power and streaming control
 192  * @clock_frequency: device bus clock frequency
 193  * @hs_settle: HS-RX settle time
 194  * @num_lanes: number of MIPI-CSI data lanes used
 195  * @max_num_lanes: maximum number of MIPI-CSI data lanes supported
 196  * @wclk_ext: CSI wrapper clock: 0 - bus clock, 1 - external SCLK_CAM
 197  * @csis_fmt: current CSIS pixel format
 198  * @format: common media bus format for the source and sink pad
 199  * @slock: spinlock protecting structure members below
 200  * @pkt_buf: the frame embedded (non-image) data buffer
 201  * @events: MIPI-CSIS event (error) counters
 202  */
 203 struct csis_state {
 204         struct mutex lock;
 205         struct media_pad pads[CSIS_PADS_NUM];
 206         struct v4l2_subdev sd;
 207         u8 index;
 208         struct platform_device *pdev;
 209         struct phy *phy;
 210         void __iomem *regs;
 211         struct regulator_bulk_data supplies[CSIS_NUM_SUPPLIES];
 212         struct clk *clock[NUM_CSIS_CLOCKS];
 213         int irq;
 214         u32 interrupt_mask;
 215         u32 flags;
 216
 217         u32 clk_frequency;
 218         u32 hs_settle;
 219         u32 num_lanes;
 220         u32 max_num_lanes;
 221         u8 wclk_ext;
 222
 223         const struct csis_pix_format *csis_fmt;
 224         struct v4l2_mbus_framefmt format;
 225
 226         spinlock_t slock;
 227         struct csis_pktbuf pkt_buf;
 228         struct s5pcsis_event events[S5PCSIS_NUM_EVENTS];
 229 };
 230
 231 /**
 232  * struct csis_pix_format - CSIS pixel format description
 233  * @pix_width_alignment: horizontal pixel alignment, width will be
 234  *                       multiple of 2^pix_width_alignment
 235  * @code: corresponding media bus code
 236  * @fmt_reg: S5PCSIS_CONFIG register value
 237  * @data_alignment: MIPI-CSI data alignment in bits
 238  */
 239 struct csis_pix_format {
 240         unsigned int pix_width_alignment;
 241         u32 code;
 242         u32 fmt_reg;
 243         u8 data_alignment;
 244 };
 245
 246 static const struct csis_pix_format s5pcsis_formats[] = {
 247         {
 248                 .code = MEDIA_BUS_FMT_VYUY8_2X8,
 249                 .fmt_reg = S5PCSIS_CFG_FMT_YCBCR422_8BIT,
 250                 .data_alignment = 32,
 251         }, {
 252                 .code = MEDIA_BUS_FMT_JPEG_1X8,
 253                 .fmt_reg = S5PCSIS_CFG_FMT_USER(1),
 254                 .data_alignment = 32,
 255         }, {
 256                 .code = MEDIA_BUS_FMT_S5C_UYVY_JPEG_1X8,
 257                 .fmt_reg = S5PCSIS_CFG_FMT_USER(1),
 258                 .data_alignment = 32,
 259         }, {
 260                 .code = MEDIA_BUS_FMT_SGRBG8_1X8,
 261                 .fmt_reg = S5PCSIS_CFG_FMT_RAW8,
 262                 .data_alignment = 24,
 263         }, {
 264                 .code = MEDIA_BUS_FMT_SGRBG10_1X10,
 265                 .fmt_reg = S5PCSIS_CFG_FMT_RAW10,
 266                 .data_alignment = 24,
 267         }, {
 268                 .code = MEDIA_BUS_FMT_SGRBG12_1X12,
 269                 .fmt_reg = S5PCSIS_CFG_FMT_RAW12,
 270                 .data_alignment = 24,
 271         }
 272 };
 273
 274 #define s5pcsis_write(__csis, __r, __v) writel(__v, __csis->regs + __r)
 275 #define s5pcsis_read(__csis, __r) readl(__csis->regs + __r)
 276
 277 static struct csis_state *sd_to_csis_state(struct v4l2_subdev *sdev)
 278 {
 279         return container_of(sdev, struct csis_state, sd);
 280 }
 281
 282 static const struct csis_pix_format *find_csis_format(
 283         struct v4l2_mbus_framefmt *mf)
 284 {
 285         int i;
 286
 287         for (i = 0; i < ARRAY_SIZE(s5pcsis_formats); i++)
 288                 if (mf->code == s5pcsis_formats[i].code)
 289                         return &s5pcsis_formats[i];
 290         return NULL;
 291 }
 292
 293 static void s5pcsis_enable_interrupts(struct csis_state *state, bool on)
 294 {
 295         u32 val = s5pcsis_read(state, S5PCSIS_INTMSK);
 296         if (on)
 297                 val |= state->interrupt_mask;
 298         else
 299                 val &= ~state->interrupt_mask;
 300         s5pcsis_write(state, S5PCSIS_INTMSK, val);
 301 }
 302
 303 static void s5pcsis_reset(struct csis_state *state)
 304 {
 305         u32 val = s5pcsis_read(state, S5PCSIS_CTRL);
 306
 307         s5pcsis_write(state, S5PCSIS_CTRL, val | S5PCSIS_CTRL_RESET);
 308         udelay(10);
 309 }
 310
 311 static void s5pcsis_system_enable(struct csis_state *state, int on)
 312 {
 313         u32 val, mask;
 314
 315         val = s5pcsis_read(state, S5PCSIS_CTRL);
 316         if (on)
 317                 val |= S5PCSIS_CTRL_ENABLE;
 318         else
 319                 val &= ~S5PCSIS_CTRL_ENABLE;
 320         s5pcsis_write(state, S5PCSIS_CTRL, val);
 321
 322         val = s5pcsis_read(state, S5PCSIS_DPHYCTRL);
 323         val &= ~S5PCSIS_DPHYCTRL_ENABLE;
 324         if (on) {
 325                 mask = (1 << (state->num_lanes + 1)) - 1;
 326                 val |= (mask & S5PCSIS_DPHYCTRL_ENABLE);
 327         }
 328         s5pcsis_write(state, S5PCSIS_DPHYCTRL, val);
 329 }
 330
 331 /* Called with the state.lock mutex held */
 332 static void __s5pcsis_set_format(struct csis_state *state)
 333 {
 334         struct v4l2_mbus_framefmt *mf = &state->format;
 335         u32 val;
 336
 337         v4l2_dbg(1, debug, &state->sd, "fmt: %#x, %d x %d\n",
 338                  mf->code, mf->width, mf->height);
 339
 340         /* Color format */
 341         val = s5pcsis_read(state, S5PCSIS_CONFIG);
 342         val = (val & ~S5PCSIS_CFG_FMT_MASK) | state->csis_fmt->fmt_reg;
 343         s5pcsis_write(state, S5PCSIS_CONFIG, val);
 344
 345         /* Pixel resolution */
 346         val = (mf->width << 16) | mf->height;
 347         s5pcsis_write(state, S5PCSIS_RESOL, val);
 348 }
 349
 350 static void s5pcsis_set_hsync_settle(struct csis_state *state, int settle)
 351 {
 352         u32 val = s5pcsis_read(state, S5PCSIS_DPHYCTRL);
 353
 354         val = (val & ~S5PCSIS_DPHYCTRL_HSS_MASK) | (settle << 27);
 355         s5pcsis_write(state, S5PCSIS_DPHYCTRL, val);
 356 }
 357
 358 static void s5pcsis_set_params(struct csis_state *state)
 359 {
 360         u32 val;
 361
 362         val = s5pcsis_read(state, S5PCSIS_CONFIG);
 363         val = (val & ~S5PCSIS_CFG_NR_LANE_MASK) | (state->num_lanes - 1);
 364         s5pcsis_write(state, S5PCSIS_CONFIG, val);
 365
 366         __s5pcsis_set_format(state);
 367         s5pcsis_set_hsync_settle(state, state->hs_settle);
 368
 369         val = s5pcsis_read(state, S5PCSIS_CTRL);
 370         if (state->csis_fmt->data_alignment == 32)
 371                 val |= S5PCSIS_CTRL_ALIGN_32BIT;
 372         else /* 24-bits */
 373                 val &= ~S5PCSIS_CTRL_ALIGN_32BIT;
 374
 375         val &= ~S5PCSIS_CTRL_WCLK_EXTCLK;
 376         if (state->wclk_ext)
 377                 val |= S5PCSIS_CTRL_WCLK_EXTCLK;
 378         s5pcsis_write(state, S5PCSIS_CTRL, val);
 379
 380         /* Update the shadow register. */
 381         val = s5pcsis_read(state, S5PCSIS_CTRL);
 382         s5pcsis_write(state, S5PCSIS_CTRL, val | S5PCSIS_CTRL_UPDATE_SHADOW);
 383 }
 384
 385 static void s5pcsis_clk_put(struct csis_state *state)
 386 {
 387         int i;
 388
 389         for (i = 0; i < NUM_CSIS_CLOCKS; i++) {
 390                 if (IS_ERR(state->clock[i]))
 391                         continue;
 392                 clk_unprepare(state->clock[i]);
 393                 clk_put(state->clock[i]);
 394                 state->clock[i] = ERR_PTR(-EINVAL);
 395         }
 396 }
 397
 398 static int s5pcsis_clk_get(struct csis_state *state)
 399 {
 400         struct device *dev = &state->pdev->dev;
 401         int i, ret;
 402
 403         for (i = 0; i < NUM_CSIS_CLOCKS; i++)
 404                 state->clock[i] = ERR_PTR(-EINVAL);
 405
 406         for (i = 0; i < NUM_CSIS_CLOCKS; i++) {
 407                 state->clock[i] = clk_get(dev, csi_clock_name[i]);
 408                 if (IS_ERR(state->clock[i])) {
 409                         ret = PTR_ERR(state->clock[i]);
 410                         goto err;
 411                 }
 412                 ret = clk_prepare(state->clock[i]);
 413                 if (ret < 0) {
 414                         clk_put(state->clock[i]);
 415                         state->clock[i] = ERR_PTR(-EINVAL);
 416                         goto err;
 417                 }
 418         }
 419         return 0;
 420 err:
 421         s5pcsis_clk_put(state);
 422         dev_err(dev, "failed to get clock: %s\n", csi_clock_name[i]);
 423         return ret;
 424 }
 425
 426 static void dump_regs(struct csis_state *state, const char *label)
 427 {
 428         struct {
 429                 u32 offset;
 430                 const char * const name;
 431         } registers[] = {
 432                 { 0x00, "CTRL" },
 433                 { 0x04, "DPHYCTRL" },
 434                 { 0x08, "CONFIG" },
 435                 { 0x0c, "DPHYSTS" },
 436                 { 0x10, "INTMSK" },
 437                 { 0x2c, "RESOL" },
 438                 { 0x38, "SDW_CONFIG" },
 439         };
 440         u32 i;
 441
 442         v4l2_info(&state->sd, "--- %s ---\n", label);
 443
 444         for (i = 0; i < ARRAY_SIZE(registers); i++) {
 445                 u32 cfg = s5pcsis_read(state, registers[i].offset);
 446                 v4l2_info(&state->sd, "%10s: 0x%08x\n", registers[i].name, cfg);
 447         }
 448 }
 449
 450 static void s5pcsis_start_stream(struct csis_state *state)
 451 {
 452         s5pcsis_reset(state);
 453         s5pcsis_set_params(state);
 454         s5pcsis_system_enable(state, true);
 455         s5pcsis_enable_interrupts(state, true);
 456 }
 457
 458 static void s5pcsis_stop_stream(struct csis_state *state)
 459 {
 460         s5pcsis_enable_interrupts(state, false);
 461         s5pcsis_system_enable(state, false);
 462 }
 463
 464 static void s5pcsis_clear_counters(struct csis_state *state)
 465 {
 466         unsigned long flags;
 467         int i;
 468
 469         spin_lock_irqsave(&state->slock, flags);
 470         for (i = 0; i < S5PCSIS_NUM_EVENTS; i++)
 471                 state->events[i].counter = 0;
 472         spin_unlock_irqrestore(&state->slock, flags);
 473 }
 474
 475 static void s5pcsis_log_counters(struct csis_state *state, bool non_errors)
 476 {
 477         int i = non_errors ? S5PCSIS_NUM_EVENTS : S5PCSIS_NUM_EVENTS - 4;
 478         unsigned long flags;
 479
 480         spin_lock_irqsave(&state->slock, flags);
 481
 482         for (i--; i >= 0; i--) {
 483                 if (state->events[i].counter > 0 || debug)
 484                         v4l2_info(&state->sd, "%s events: %d\n",
 485                                   state->events[i].name,
 486                                   state->events[i].counter);
 487         }
 488         spin_unlock_irqrestore(&state->slock, flags);
 489 }
 490
 491 /*
 492  * V4L2 subdev operations
 493  */
 494 static int s5pcsis_s_power(struct v4l2_subdev *sd, int on)
 495 {
 496         struct csis_state *state = sd_to_csis_state(sd);
 497         struct device *dev = &state->pdev->dev;
 498
 499         if (on)
 500                 return pm_runtime_get_sync(dev);
 501
 502         return pm_runtime_put_sync(dev);
 503 }
 504
 505 static int s5pcsis_s_stream(struct v4l2_subdev *sd, int enable)
 506 {
 507         struct csis_state *state = sd_to_csis_state(sd);
 508         int ret = 0;
 509
 510         v4l2_dbg(1, debug, sd, "%s: %d, state: 0x%x\n",
 511                  __func__, enable, state->flags);
 512
 513         if (enable) {
 514                 s5pcsis_clear_counters(state);
 515                 ret = pm_runtime_get_sync(&state->pdev->dev);
 516                 if (ret && ret != 1)
 517                         return ret;
 518         }
 519
 520         mutex_lock(&state->lock);
 521         if (enable) {
 522                 if (state->flags & ST_SUSPENDED) {
 523                         ret = -EBUSY;
 524                         goto unlock;
 525                 }
 526                 s5pcsis_start_stream(state);
 527                 state->flags |= ST_STREAMING;
 528         } else {
 529                 s5pcsis_stop_stream(state);
 530                 state->flags &= ~ST_STREAMING;
 531                 if (debug > 0)
 532                         s5pcsis_log_counters(state, true);
 533         }
 534 unlock:
 535         mutex_unlock(&state->lock);
 536         if (!enable)
 537                 pm_runtime_put(&state->pdev->dev);
 538
 539         return ret == 1 ? 0 : ret;
 540 }
 541
 542 static int s5pcsis_enum_mbus_code(struct v4l2_subdev *sd,
 543                                   struct v4l2_subdev_pad_config *cfg,
 544                                   struct v4l2_subdev_mbus_code_enum *code)
 545 {
 546         if (code->index >= ARRAY_SIZE(s5pcsis_formats))
 547                 return -EINVAL;
 548
 549         code->code = s5pcsis_formats[code->index].code;
 550         return 0;
 551 }
 552
 553 static struct csis_pix_format const *s5pcsis_try_format(
 554         struct v4l2_mbus_framefmt *mf)
 555 {
 556         struct csis_pix_format const *csis_fmt;
 557
 558         csis_fmt = find_csis_format(mf);
 559         if (csis_fmt == NULL)
 560                 csis_fmt = &s5pcsis_formats[0];
 561
 562         mf->code = csis_fmt->code;
 563         v4l_bound_align_image(&mf->width, 1, CSIS_MAX_PIX_WIDTH,
 564                               csis_fmt->pix_width_alignment,
 565                               &mf->height, 1, CSIS_MAX_PIX_HEIGHT, 1,
 566                               0);
 567         return csis_fmt;
 568 }
 569
 570 static struct v4l2_mbus_framefmt *__s5pcsis_get_format(
 571                 struct csis_state *state, struct v4l2_subdev_pad_config *cfg,
 572                 enum v4l2_subdev_format_whence which)
 573 {
 574         if (which == V4L2_SUBDEV_FORMAT_TRY)
 575                 return cfg ? v4l2_subdev_get_try_format(&state->sd, cfg, 0) : NULL;
 576
 577         return &state->format;
 578 }
 579
 580 static int s5pcsis_set_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_pad_config *cfg,
 581                            struct v4l2_subdev_format *fmt)
 582 {
 583         struct csis_state *state = sd_to_csis_state(sd);
 584         struct csis_pix_format const *csis_fmt;
 585         struct v4l2_mbus_framefmt *mf;
 586
 587         mf = __s5pcsis_get_format(state, cfg, fmt->which);
 588
 589         if (fmt->pad == CSIS_PAD_SOURCE) {
 590                 if (mf) {
 591                         mutex_lock(&state->lock);
 592                         fmt->format = *mf;
 593                         mutex_unlock(&state->lock);
 594                 }
 595                 return 0;
 596         }
 597         csis_fmt = s5pcsis_try_format(&fmt->format);
 598         if (mf) {
 599                 mutex_lock(&state->lock);
 600                 *mf = fmt->format;
 601                 if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE)
 602                         state->csis_fmt = csis_fmt;
 603                 mutex_unlock(&state->lock);
 604         }
 605         return 0;
 606 }
 607
 608 static int s5pcsis_get_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_pad_config *cfg,
 609                            struct v4l2_subdev_format *fmt)
 610 {
 611         struct csis_state *state = sd_to_csis_state(sd);
 612         struct v4l2_mbus_framefmt *mf;
 613
 614         mf = __s5pcsis_get_format(state, cfg, fmt->which);
 615         if (!mf)
 616                 return -EINVAL;
 617
 618         mutex_lock(&state->lock);
 619         fmt->format = *mf;
 620         mutex_unlock(&state->lock);
 621         return 0;
 622 }
 623
 624 static int s5pcsis_s_rx_buffer(struct v4l2_subdev *sd, void *buf,
 625                                unsigned int *size)
 626 {
 627         struct csis_state *state = sd_to_csis_state(sd);
 628         unsigned long flags;
 629
 630         *size = min_t(unsigned int, *size, S5PCSIS_PKTDATA_SIZE);
 631
 632         spin_lock_irqsave(&state->slock, flags);
 633         state->pkt_buf.data = buf;
 634         state->pkt_buf.len = *size;
 635         spin_unlock_irqrestore(&state->slock, flags);
 636
 637         return 0;
 638 }
 639
 640 static int s5pcsis_log_status(struct v4l2_subdev *sd)
 641 {
 642         struct csis_state *state = sd_to_csis_state(sd);
 643
 644         mutex_lock(&state->lock);
 645         s5pcsis_log_counters(state, true);
 646         if (debug && (state->flags & ST_POWERED))
 647                 dump_regs(state, __func__);
 648         mutex_unlock(&state->lock);
 649         return 0;
 650 }
 651
 652 static int s5pcsis_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
 653 {
 654         struct v4l2_mbus_framefmt *format = v4l2_subdev_get_try_format(sd, fh->pad, 0);
 655
 656         format->colorspace = V4L2_COLORSPACE_JPEG;
 657         format->code = s5pcsis_formats[0].code;
 658         format->width = S5PCSIS_DEF_PIX_WIDTH;
 659         format->height = S5PCSIS_DEF_PIX_HEIGHT;
 660         format->field = V4L2_FIELD_NONE;
 661
 662         return 0;
 663 }
 664
 665 static const struct v4l2_subdev_internal_ops s5pcsis_sd_internal_ops = {
 666         .open = s5pcsis_open,
 667 };
 668
 669 static struct v4l2_subdev_core_ops s5pcsis_core_ops = {
 670         .s_power = s5pcsis_s_power,
 671         .log_status = s5pcsis_log_status,
 672 };
 673
 674 static struct v4l2_subdev_pad_ops s5pcsis_pad_ops = {
 675         .enum_mbus_code = s5pcsis_enum_mbus_code,
 676         .get_fmt = s5pcsis_get_fmt,
 677         .set_fmt = s5pcsis_set_fmt,
 678 };
 679
 680 static struct v4l2_subdev_video_ops s5pcsis_video_ops = {
 681         .s_rx_buffer = s5pcsis_s_rx_buffer,
 682         .s_stream = s5pcsis_s_stream,
 683 };
 684
 685 static struct v4l2_subdev_ops s5pcsis_subdev_ops = {
 686         .core = &s5pcsis_core_ops,
 687         .pad = &s5pcsis_pad_ops,
 688         .video = &s5pcsis_video_ops,
 689 };
 690
 691 static irqreturn_t s5pcsis_irq_handler(int irq, void *dev_id)
 692 {
 693         struct csis_state *state = dev_id;
 694         struct csis_pktbuf *pktbuf = &state->pkt_buf;
 695         unsigned long flags;
 696         u32 status;
 697
 698         status = s5pcsis_read(state, S5PCSIS_INTSRC);
 699         spin_lock_irqsave(&state->slock, flags);
 700
 701         if ((status & S5PCSIS_INTSRC_NON_IMAGE_DATA) && pktbuf->data) {
 702                 u32 offset;
 703
 704                 if (status & S5PCSIS_INTSRC_EVEN)
 705                         offset = S5PCSIS_PKTDATA_EVEN;
 706                 else
 707                         offset = S5PCSIS_PKTDATA_ODD;
 708
 709                 memcpy(pktbuf->data, state->regs + offset, pktbuf->len);
 710                 pktbuf->data = NULL;
 711                 rmb();
 712         }
 713
 714         /* Update the event/error counters */
 715         if ((status & S5PCSIS_INTSRC_ERRORS) || debug) {
 716                 int i;
 717                 for (i = 0; i < S5PCSIS_NUM_EVENTS; i++) {
 718                         if (!(status & state->events[i].mask))
 719                                 continue;
 720                         state->events[i].counter++;
 721                         v4l2_dbg(2, debug, &state->sd, "%s: %d\n",
 722                                  state->events[i].name,
 723                                  state->events[i].counter);
 724                 }
 725                 v4l2_dbg(2, debug, &state->sd, "status: %08x\n", status);
 726         }
 727         spin_unlock_irqrestore(&state->slock, flags);
 728
 729         s5pcsis_write(state, S5PCSIS_INTSRC, status);
 730         return IRQ_HANDLED;
 731 }
 732
 733 static int s5pcsis_parse_dt(struct platform_device *pdev,
 734                             struct csis_state *state)
 735 {
 736         struct device_node *node = pdev->dev.of_node;
 737         struct v4l2_of_endpoint endpoint;
 738
 739         if (of_property_read_u32(node, "clock-frequency",
 740                                  &state->clk_frequency))
 741                 state->clk_frequency = DEFAULT_SCLK_CSIS_FREQ;
 742         if (of_property_read_u32(node, "bus-width",
 743                                  &state->max_num_lanes))
 744                 return -EINVAL;
 745
 746         node = of_graph_get_next_endpoint(node, NULL);
 747         if (!node) {
 748                 dev_err(&pdev->dev, "No port node at %s\n",
 749                                 pdev->dev.of_node->full_name);
 750                 return -EINVAL;
 751         }
 752         /* Get port node and validate MIPI-CSI channel id. */
 753         v4l2_of_parse_endpoint(node, &endpoint);
 754
 755         state->index = endpoint.base.port - FIMC_INPUT_MIPI_CSI2_0;
 756         if (state->index >= CSIS_MAX_ENTITIES)
 757                 return -ENXIO;
 758
 759         /* Get MIPI CSI-2 bus configration from the endpoint node. */
 760         of_property_read_u32(node, "samsung,csis-hs-settle",
 761                                         &state->hs_settle);
 762         state->wclk_ext = of_property_read_bool(node,
 763                                         "samsung,csis-wclk");
 764
 765         state->num_lanes = endpoint.bus.mipi_csi2.num_data_lanes;
 766         of_node_put(node);
 767
 768         return 0;
 769 }
 770
 771 static int s5pcsis_pm_resume(struct device *dev, bool runtime);
 772 static const struct of_device_id s5pcsis_of_match[];
 773
 774 static int s5pcsis_probe(struct platform_device *pdev)
 775 {
 776         const struct of_device_id *of_id;
 777         const struct csis_drvdata *drv_data;
 778         struct device *dev = &pdev->dev;
 779         struct resource *mem_res;
 780         struct csis_state *state;
 781         int ret = -ENOMEM;
 782         int i;
 783
 784         state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL);
 785         if (!state)
 786                 return -ENOMEM;
 787
 788         mutex_init(&state->lock);
 789         spin_lock_init(&state->slock);
 790         state->pdev = pdev;
 791
 792         of_id = of_match_node(s5pcsis_of_match, dev->of_node);
 793         if (WARN_ON(of_id == NULL))
 794                 return -EINVAL;
 795
 796         drv_data = of_id->data;
 797         state->interrupt_mask = drv_data->interrupt_mask;
 798
 799         ret = s5pcsis_parse_dt(pdev, state);
 800         if (ret < 0)
 801                 return ret;
 802
 803         if (state->num_lanes == 0 || state->num_lanes > state->max_num_lanes) {
 804                 dev_err(dev, "Unsupported number of data lanes: %d (max. %d)\n",
 805                         state->num_lanes, state->max_num_lanes);
 806                 return -EINVAL;
 807         }
 808
 809         state->phy = devm_phy_get(dev, "csis");
 810         if (IS_ERR(state->phy))
 811                 return PTR_ERR(state->phy);
 812
 813         mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 814         state->regs = devm_ioremap_resource(dev, mem_res);
 815         if (IS_ERR(state->regs))
 816                 return PTR_ERR(state->regs);
 817
 818         state->irq = platform_get_irq(pdev, 0);
 819         if (state->irq < 0) {
 820                 dev_err(dev, "Failed to get irq\n");
 821                 return state->irq;
 822         }
 823
 824         for (i = 0; i < CSIS_NUM_SUPPLIES; i++)
 825                 state->supplies[i].supply = csis_supply_name[i];
 826
 827         ret = devm_regulator_bulk_get(dev, CSIS_NUM_SUPPLIES,
 828                                  state->supplies);
 829         if (ret)
 830                 return ret;
 831
 832         ret = s5pcsis_clk_get(state);
 833         if (ret < 0)
 834                 return ret;
 835
 836         if (state->clk_frequency)
 837                 ret = clk_set_rate(state->clock[CSIS_CLK_MUX],
 838                                    state->clk_frequency);
 839         else
 840                 dev_WARN(dev, "No clock frequency specified!\n");
 841         if (ret < 0)
 842                 goto e_clkput;
 843
 844         ret = clk_enable(state->clock[CSIS_CLK_MUX]);
 845         if (ret < 0)
 846                 goto e_clkput;
 847
 848         ret = devm_request_irq(dev, state->irq, s5pcsis_irq_handler,
 849                                0, dev_name(dev), state);
 850         if (ret) {
 851                 dev_err(dev, "Interrupt request failed\n");
 852                 goto e_clkdis;
 853         }
 854
 855         v4l2_subdev_init(&state->sd, &s5pcsis_subdev_ops);
 856         state->sd.owner = THIS_MODULE;
 857         snprintf(state->sd.name, sizeof(state->sd.name), "%s.%d",
 858                  CSIS_SUBDEV_NAME, state->index);
 859         state->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
 860         state->csis_fmt = &s5pcsis_formats[0];
 861
 862         state->format.code = s5pcsis_formats[0].code;
 863         state->format.width = S5PCSIS_DEF_PIX_WIDTH;
 864         state->format.height = S5PCSIS_DEF_PIX_HEIGHT;
 865
 866         state->pads[CSIS_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
 867         state->pads[CSIS_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
 868         ret = media_entity_init(&state->sd.entity,
 869                                 CSIS_PADS_NUM, state->pads, 0);
 870         if (ret < 0)
 871                 goto e_clkdis;
 872
 873         /* This allows to retrieve the platform device id by the host driver */
 874         v4l2_set_subdevdata(&state->sd, pdev);
 875
 876         /* .. and a pointer to the subdev. */
 877         platform_set_drvdata(pdev, &state->sd);
 878         memcpy(state->events, s5pcsis_events, sizeof(state->events));
 879
 880         pm_runtime_enable(dev);
 881         if (!pm_runtime_enabled(dev)) {
 882                 ret = s5pcsis_pm_resume(dev, true);
 883                 if (ret < 0)
 884                         goto e_m_ent;
 885         }
 886
 887         dev_info(&pdev->dev, "lanes: %d, hs_settle: %d, wclk: %d, freq: %u\n",
 888                  state->num_lanes, state->hs_settle, state->wclk_ext,
 889                  state->clk_frequency);
 890         return 0;
 891
 892 e_m_ent:
 893         media_entity_cleanup(&state->sd.entity);
 894 e_clkdis:
 895         clk_disable(state->clock[CSIS_CLK_MUX]);
 896 e_clkput:
 897         s5pcsis_clk_put(state);
 898         return ret;
 899 }
 900
 901 static int s5pcsis_pm_suspend(struct device *dev, bool runtime)
 902 {
 903         struct platform_device *pdev = to_platform_device(dev);
 904         struct v4l2_subdev *sd = platform_get_drvdata(pdev);
 905         struct csis_state *state = sd_to_csis_state(sd);
 906         int ret = 0;
 907
 908         v4l2_dbg(1, debug, sd, "%s: flags: 0x%x\n",
 909                  __func__, state->flags);
 910
 911         mutex_lock(&state->lock);
 912         if (state->flags & ST_POWERED) {
 913                 s5pcsis_stop_stream(state);
 914                 ret = phy_power_off(state->phy);
 915                 if (ret)
 916                         goto unlock;
 917                 ret = regulator_bulk_disable(CSIS_NUM_SUPPLIES,
 918                                              state->supplies);
 919                 if (ret)
 920                         goto unlock;
 921                 clk_disable(state->clock[CSIS_CLK_GATE]);
 922                 state->flags &= ~ST_POWERED;
 923                 if (!runtime)
 924                         state->flags |= ST_SUSPENDED;
 925         }
 926  unlock:
 927         mutex_unlock(&state->lock);
 928         return ret ? -EAGAIN : 0;
 929 }
 930
 931 static int s5pcsis_pm_resume(struct device *dev, bool runtime)
 932 {
 933         struct platform_device *pdev = to_platform_device(dev);
 934         struct v4l2_subdev *sd = platform_get_drvdata(pdev);
 935         struct csis_state *state = sd_to_csis_state(sd);
 936         int ret = 0;
 937
 938         v4l2_dbg(1, debug, sd, "%s: flags: 0x%x\n",
 939                  __func__, state->flags);
 940
 941         mutex_lock(&state->lock);
 942         if (!runtime && !(state->flags & ST_SUSPENDED))
 943                 goto unlock;
 944
 945         if (!(state->flags & ST_POWERED)) {
 946                 ret = regulator_bulk_enable(CSIS_NUM_SUPPLIES,
 947                                             state->supplies);
 948                 if (ret)
 949                         goto unlock;
 950                 ret = phy_power_on(state->phy);
 951                 if (!ret) {
 952                         state->flags |= ST_POWERED;
 953                 } else {
 954                         regulator_bulk_disable(CSIS_NUM_SUPPLIES,
 955                                                state->supplies);
 956                         goto unlock;
 957                 }
 958                 clk_enable(state->clock[CSIS_CLK_GATE]);
 959         }
 960         if (state->flags & ST_STREAMING)
 961                 s5pcsis_start_stream(state);
 962
 963         state->flags &= ~ST_SUSPENDED;
 964  unlock:
 965         mutex_unlock(&state->lock);
 966         return ret ? -EAGAIN : 0;
 967 }
 968
 969 #ifdef CONFIG_PM_SLEEP
 970 static int s5pcsis_suspend(struct device *dev)
 971 {
 972         return s5pcsis_pm_suspend(dev, false);
 973 }
 974
 975 static int s5pcsis_resume(struct device *dev)
 976 {
 977         return s5pcsis_pm_resume(dev, false);
 978 }
 979 #endif
 980
 981 #ifdef CONFIG_PM
 982 static int s5pcsis_runtime_suspend(struct device *dev)
 983 {
 984         return s5pcsis_pm_suspend(dev, true);
 985 }
 986
 987 static int s5pcsis_runtime_resume(struct device *dev)
 988 {
 989         return s5pcsis_pm_resume(dev, true);
 990 }
 991 #endif
 992
 993 static int s5pcsis_remove(struct platform_device *pdev)
 994 {
 995         struct v4l2_subdev *sd = platform_get_drvdata(pdev);
 996         struct csis_state *state = sd_to_csis_state(sd);
 997
 998         pm_runtime_disable(&pdev->dev);
 999         s5pcsis_pm_suspend(&pdev->dev, true);
1000         clk_disable(state->clock[CSIS_CLK_MUX]);
1001         pm_runtime_set_suspended(&pdev->dev);
1002         s5pcsis_clk_put(state);
1003
1004         media_entity_cleanup(&state->sd.entity);
1005
1006         return 0;
1007 }
1008
1009 static const struct dev_pm_ops s5pcsis_pm_ops = {
1010         SET_RUNTIME_PM_OPS(s5pcsis_runtime_suspend, s5pcsis_runtime_resume,
1011                            NULL)
1012         SET_SYSTEM_SLEEP_PM_OPS(s5pcsis_suspend, s5pcsis_resume)
1013 };
1014
1015 static const struct csis_drvdata exynos4_csis_drvdata = {
1016         .interrupt_mask = S5PCSIS_INTMSK_EXYNOS4_EN_ALL,
1017 };
1018
1019 static const struct csis_drvdata exynos5_csis_drvdata = {
1020         .interrupt_mask = S5PCSIS_INTMSK_EXYNOS5_EN_ALL,
1021 };
1022
1023 static const struct of_device_id s5pcsis_of_match[] = {
1024         {
1025                 .compatible = "samsung,s5pv210-csis",
1026                 .data = &exynos4_csis_drvdata,
1027         }, {
1028                 .compatible = "samsung,exynos4210-csis",
1029                 .data = &exynos4_csis_drvdata,
1030         }, {
1031                 .compatible = "samsung,exynos5250-csis",
1032                 .data = &exynos5_csis_drvdata,
1033         },
1034         { /* sentinel */ },
1035 };
1036 MODULE_DEVICE_TABLE(of, s5pcsis_of_match);
1037
1038 static struct platform_driver s5pcsis_driver = {
1039         .probe          = s5pcsis_probe,
1040         .remove         = s5pcsis_remove,
1041         .driver         = {
1042                 .of_match_table = s5pcsis_of_match,
1043                 .name           = CSIS_DRIVER_NAME,
1044                 .pm             = &s5pcsis_pm_ops,
1045         },
1046 };
1047
1048 module_platform_driver(s5pcsis_driver);
1049
1050 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
1051 MODULE_DESCRIPTION("Samsung S5P/EXYNOS SoC MIPI-CSI2 receiver driver");
1052 MODULE_LICENSE("GPL");