drivers/media/platform/soc_camera/sh_mobile_csi2.c

   1 /*
   2  * Driver for the SH-Mobile MIPI CSI-2 unit
   3  *
   4  * Copyright (C) 2010, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <linux/delay.h>
  12 #include <linux/i2c.h>
  13 #include <linux/io.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/pm_runtime.h>
  16 #include <linux/slab.h>
  17 #include <linux/videodev2.h>
  18 #include <linux/module.h>
  19
  20 #include <media/sh_mobile_ceu.h>
  21 #include <media/sh_mobile_csi2.h>
  22 #include <media/soc_camera.h>
  23 #include <media/soc_mediabus.h>
  24 #include <media/v4l2-common.h>
  25 #include <media/v4l2-dev.h>
  26 #include <media/v4l2-device.h>
  27 #include <media/v4l2-mediabus.h>
  28 #include <media/v4l2-subdev.h>
  29
  30 #define SH_CSI2_TREF    0x00
  31 #define SH_CSI2_SRST    0x04
  32 #define SH_CSI2_PHYCNT  0x08
  33 #define SH_CSI2_CHKSUM  0x0C
  34 #define SH_CSI2_VCDT    0x10
  35
  36 struct sh_csi2 {
  37         struct v4l2_subdev              subdev;
  38         struct list_head                list;
  39         unsigned int                    irq;
  40         unsigned long                   mipi_flags;
  41         void __iomem                    *base;
  42         struct platform_device          *pdev;
  43         struct sh_csi2_client_config    *client;
  44 };
  45
  46 static int sh_csi2_try_fmt(struct v4l2_subdev *sd,
  47                            struct v4l2_mbus_framefmt *mf)
  48 {
  49         struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev);
  50         struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data;
  51
  52         if (mf->width > 8188)
  53                 mf->width = 8188;
  54         else if (mf->width & 1)
  55                 mf->width &= ~1;
  56
  57         switch (pdata->type) {
  58         case SH_CSI2C:
  59                 switch (mf->code) {
  60                 case V4L2_MBUS_FMT_UYVY8_2X8:           /* YUV422 */
  61                 case V4L2_MBUS_FMT_YUYV8_1_5X8:         /* YUV420 */
  62                 case V4L2_MBUS_FMT_Y8_1X8:              /* RAW8 */
  63                 case V4L2_MBUS_FMT_SBGGR8_1X8:
  64                 case V4L2_MBUS_FMT_SGRBG8_1X8:
  65                         break;
  66                 default:
  67                         /* All MIPI CSI-2 devices must support one of primary formats */
  68                         mf->code = V4L2_MBUS_FMT_YUYV8_2X8;
  69                 }
  70                 break;
  71         case SH_CSI2I:
  72                 switch (mf->code) {
  73                 case V4L2_MBUS_FMT_Y8_1X8:              /* RAW8 */
  74                 case V4L2_MBUS_FMT_SBGGR8_1X8:
  75                 case V4L2_MBUS_FMT_SGRBG8_1X8:
  76                 case V4L2_MBUS_FMT_SBGGR10_1X10:        /* RAW10 */
  77                 case V4L2_MBUS_FMT_SBGGR12_1X12:        /* RAW12 */
  78                         break;
  79                 default:
  80                         /* All MIPI CSI-2 devices must support one of primary formats */
  81                         mf->code = V4L2_MBUS_FMT_SBGGR8_1X8;
  82                 }
  83                 break;
  84         }
  85
  86         return 0;
  87 }
  88
  89 /*
  90  * We have done our best in try_fmt to try and tell the sensor, which formats
  91  * we support. If now the configuration is unsuitable for us we can only
  92  * error out.
  93  */
  94 static int sh_csi2_s_fmt(struct v4l2_subdev *sd,
  95                          struct v4l2_mbus_framefmt *mf)
  96 {
  97         struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev);
  98         u32 tmp = (priv->client->channel & 3) << 8;
  99
 100         dev_dbg(sd->v4l2_dev->dev, "%s(%u)\n", __func__, mf->code);
 101         if (mf->width > 8188 || mf->width & 1)
 102                 return -EINVAL;
 103
 104         switch (mf->code) {
 105         case V4L2_MBUS_FMT_UYVY8_2X8:
 106                 tmp |= 0x1e;    /* YUV422 8 bit */
 107                 break;
 108         case V4L2_MBUS_FMT_YUYV8_1_5X8:
 109                 tmp |= 0x18;    /* YUV420 8 bit */
 110                 break;
 111         case V4L2_MBUS_FMT_RGB555_2X8_PADHI_BE:
 112                 tmp |= 0x21;    /* RGB555 */
 113                 break;
 114         case V4L2_MBUS_FMT_RGB565_2X8_BE:
 115                 tmp |= 0x22;    /* RGB565 */
 116                 break;
 117         case V4L2_MBUS_FMT_Y8_1X8:
 118         case V4L2_MBUS_FMT_SBGGR8_1X8:
 119         case V4L2_MBUS_FMT_SGRBG8_1X8:
 120                 tmp |= 0x2a;    /* RAW8 */
 121                 break;
 122         default:
 123                 return -EINVAL;
 124         }
 125
 126         iowrite32(tmp, priv->base + SH_CSI2_VCDT);
 127
 128         return 0;
 129 }
 130
 131 static int sh_csi2_g_mbus_config(struct v4l2_subdev *sd,
 132                                  struct v4l2_mbus_config *cfg)
 133 {
 134         cfg->flags = V4L2_MBUS_PCLK_SAMPLE_RISING |
 135                 V4L2_MBUS_HSYNC_ACTIVE_HIGH | V4L2_MBUS_VSYNC_ACTIVE_HIGH |
 136                 V4L2_MBUS_MASTER | V4L2_MBUS_DATA_ACTIVE_HIGH;
 137         cfg->type = V4L2_MBUS_PARALLEL;
 138
 139         return 0;
 140 }
 141
 142 static int sh_csi2_s_mbus_config(struct v4l2_subdev *sd,
 143                                  const struct v4l2_mbus_config *cfg)
 144 {
 145         struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev);
 146         struct soc_camera_device *icd = v4l2_get_subdev_hostdata(sd);
 147         struct v4l2_subdev *client_sd = soc_camera_to_subdev(icd);
 148         struct v4l2_mbus_config client_cfg = {.type = V4L2_MBUS_CSI2,
 149                                               .flags = priv->mipi_flags};
 150
 151         return v4l2_subdev_call(client_sd, video, s_mbus_config, &client_cfg);
 152 }
 153
 154 static struct v4l2_subdev_video_ops sh_csi2_subdev_video_ops = {
 155         .s_mbus_fmt     = sh_csi2_s_fmt,
 156         .try_mbus_fmt   = sh_csi2_try_fmt,
 157         .g_mbus_config  = sh_csi2_g_mbus_config,
 158         .s_mbus_config  = sh_csi2_s_mbus_config,
 159 };
 160
 161 static void sh_csi2_hwinit(struct sh_csi2 *priv)
 162 {
 163         struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data;
 164         __u32 tmp = 0x10; /* Enable MIPI CSI clock lane */
 165
 166         /* Reflect registers immediately */
 167         iowrite32(0x00000001, priv->base + SH_CSI2_TREF);
 168         /* reset CSI2 harware */
 169         iowrite32(0x00000001, priv->base + SH_CSI2_SRST);
 170         udelay(5);
 171         iowrite32(0x00000000, priv->base + SH_CSI2_SRST);
 172
 173         switch (pdata->type) {
 174         case SH_CSI2C:
 175                 if (priv->client->lanes == 1)
 176                         tmp |= 1;
 177                 else
 178                         /* Default - both lanes */
 179                         tmp |= 3;
 180                 break;
 181         case SH_CSI2I:
 182                 if (!priv->client->lanes || priv->client->lanes > 4)
 183                         /* Default - all 4 lanes */
 184                         tmp |= 0xf;
 185                 else
 186                         tmp |= (1 << priv->client->lanes) - 1;
 187         }
 188
 189         if (priv->client->phy == SH_CSI2_PHY_MAIN)
 190                 tmp |= 0x8000;
 191
 192         iowrite32(tmp, priv->base + SH_CSI2_PHYCNT);
 193
 194         tmp = 0;
 195         if (pdata->flags & SH_CSI2_ECC)
 196                 tmp |= 2;
 197         if (pdata->flags & SH_CSI2_CRC)
 198                 tmp |= 1;
 199         iowrite32(tmp, priv->base + SH_CSI2_CHKSUM);
 200 }
 201
 202 static int sh_csi2_client_connect(struct sh_csi2 *priv)
 203 {
 204         struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data;
 205         struct soc_camera_device *icd = v4l2_get_subdev_hostdata(&priv->subdev);
 206         struct v4l2_subdev *client_sd = soc_camera_to_subdev(icd);
 207         struct device *dev = v4l2_get_subdevdata(&priv->subdev);
 208         struct v4l2_mbus_config cfg;
 209         unsigned long common_flags, csi2_flags;
 210         int i, ret;
 211
 212         if (priv->client)
 213                 return -EBUSY;
 214
 215         for (i = 0; i < pdata->num_clients; i++)
 216                 if (&pdata->clients[i].pdev->dev == icd->pdev)
 217                         break;
 218
 219         dev_dbg(dev, "%s(%p): found #%d\n", __func__, dev, i);
 220
 221         if (i == pdata->num_clients)
 222                 return -ENODEV;
 223
 224         /* Check if we can support this camera */
 225         csi2_flags = V4L2_MBUS_CSI2_CONTINUOUS_CLOCK | V4L2_MBUS_CSI2_1_LANE;
 226
 227         switch (pdata->type) {
 228         case SH_CSI2C:
 229                 if (pdata->clients[i].lanes != 1)
 230                         csi2_flags |= V4L2_MBUS_CSI2_2_LANE;
 231                 break;
 232         case SH_CSI2I:
 233                 switch (pdata->clients[i].lanes) {
 234                 default:
 235                         csi2_flags |= V4L2_MBUS_CSI2_4_LANE;
 236                 case 3:
 237                         csi2_flags |= V4L2_MBUS_CSI2_3_LANE;
 238                 case 2:
 239                         csi2_flags |= V4L2_MBUS_CSI2_2_LANE;
 240                 }
 241         }
 242
 243         cfg.type = V4L2_MBUS_CSI2;
 244         ret = v4l2_subdev_call(client_sd, video, g_mbus_config, &cfg);
 245         if (ret == -ENOIOCTLCMD)
 246                 common_flags = csi2_flags;
 247         else if (!ret)
 248                 common_flags = soc_mbus_config_compatible(&cfg,
 249                                                           csi2_flags);
 250         else
 251                 common_flags = 0;
 252
 253         if (!common_flags)
 254                 return -EINVAL;
 255
 256         /* All good: camera MIPI configuration supported */
 257         priv->mipi_flags = common_flags;
 258         priv->client = pdata->clients + i;
 259
 260         pm_runtime_get_sync(dev);
 261
 262         sh_csi2_hwinit(priv);
 263
 264         return 0;
 265 }
 266
 267 static void sh_csi2_client_disconnect(struct sh_csi2 *priv)
 268 {
 269         if (!priv->client)
 270                 return;
 271
 272         priv->client = NULL;
 273
 274         pm_runtime_put(v4l2_get_subdevdata(&priv->subdev));
 275 }
 276
 277 static int sh_csi2_s_power(struct v4l2_subdev *sd, int on)
 278 {
 279         struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev);
 280
 281         if (on)
 282                 return sh_csi2_client_connect(priv);
 283
 284         sh_csi2_client_disconnect(priv);
 285         return 0;
 286 }
 287
 288 static struct v4l2_subdev_core_ops sh_csi2_subdev_core_ops = {
 289         .s_power        = sh_csi2_s_power,
 290 };
 291
 292 static struct v4l2_subdev_ops sh_csi2_subdev_ops = {
 293         .core   = &sh_csi2_subdev_core_ops,
 294         .video  = &sh_csi2_subdev_video_ops,
 295 };
 296
 297 static __devinit int sh_csi2_probe(struct platform_device *pdev)
 298 {
 299         struct resource *res;
 300         unsigned int irq;
 301         int ret;
 302         struct sh_csi2 *priv;
 303         /* Platform data specify the PHY, lanes, ECC, CRC */
 304         struct sh_csi2_pdata *pdata = pdev->dev.platform_data;
 305
 306         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 307         /* Interrupt unused so far */
 308         irq = platform_get_irq(pdev, 0);
 309
 310         if (!res || (int)irq <= 0 || !pdata) {
 311                 dev_err(&pdev->dev, "Not enough CSI2 platform resources.\n");
 312                 return -ENODEV;
 313         }
 314
 315         /* TODO: Add support for CSI2I. Careful: different register layout! */
 316         if (pdata->type != SH_CSI2C) {
 317                 dev_err(&pdev->dev, "Only CSI2C supported ATM.\n");
 318                 return -EINVAL;
 319         }
 320
 321         priv = kzalloc(sizeof(struct sh_csi2), GFP_KERNEL);
 322         if (!priv)
 323                 return -ENOMEM;
 324
 325         priv->irq = irq;
 326
 327         if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
 328                 dev_err(&pdev->dev, "CSI2 register region already claimed\n");
 329                 ret = -EBUSY;
 330                 goto ereqreg;
 331         }
 332
 333         priv->base = ioremap(res->start, resource_size(res));
 334         if (!priv->base) {
 335                 ret = -ENXIO;
 336                 dev_err(&pdev->dev, "Unable to ioremap CSI2 registers.\n");
 337                 goto eremap;
 338         }
 339
 340         priv->pdev = pdev;
 341         platform_set_drvdata(pdev, priv);
 342
 343         v4l2_subdev_init(&priv->subdev, &sh_csi2_subdev_ops);
 344         v4l2_set_subdevdata(&priv->subdev, &pdev->dev);
 345
 346         snprintf(priv->subdev.name, V4L2_SUBDEV_NAME_SIZE, "%s.mipi-csi",
 347                  dev_name(pdata->v4l2_dev->dev));
 348         ret = v4l2_device_register_subdev(pdata->v4l2_dev, &priv->subdev);
 349         dev_dbg(&pdev->dev, "%s(%p): ret(register_subdev) = %d\n", __func__, priv, ret);
 350         if (ret < 0)
 351                 goto esdreg;
 352
 353         pm_runtime_enable(&pdev->dev);
 354
 355         dev_dbg(&pdev->dev, "CSI2 probed.\n");
 356
 357         return 0;
 358
 359 esdreg:
 360         iounmap(priv->base);
 361 eremap:
 362         release_mem_region(res->start, resource_size(res));
 363 ereqreg:
 364         kfree(priv);
 365
 366         return ret;
 367 }
 368
 369 static __devexit int sh_csi2_remove(struct platform_device *pdev)
 370 {
 371         struct sh_csi2 *priv = platform_get_drvdata(pdev);
 372         struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 373
 374         v4l2_device_unregister_subdev(&priv->subdev);
 375         pm_runtime_disable(&pdev->dev);
 376         iounmap(priv->base);
 377         release_mem_region(res->start, resource_size(res));
 378         platform_set_drvdata(pdev, NULL);
 379         kfree(priv);
 380
 381         return 0;
 382 }
 383
 384 static struct platform_driver __refdata sh_csi2_pdrv = {
 385         .remove = __devexit_p(sh_csi2_remove),
 386         .probe  = sh_csi2_probe,
 387         .driver = {
 388                 .name   = "sh-mobile-csi2",
 389                 .owner  = THIS_MODULE,
 390         },
 391 };
 392
 393 module_platform_driver(sh_csi2_pdrv);
 394
 395 MODULE_DESCRIPTION("SH-Mobile MIPI CSI-2 driver");
 396 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
 397 MODULE_LICENSE("GPL v2");
 398 MODULE_ALIAS("platform:sh-mobile-csi2");