drivers/media/video/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
  19 #include <media/sh_mobile_ceu.h>
  20 #include <media/sh_mobile_csi2.h>
  21 #include <media/soc_camera.h>
  22 #include <media/v4l2-common.h>
  23 #include <media/v4l2-dev.h>
  24 #include <media/v4l2-device.h>
  25 #include <media/v4l2-mediabus.h>
  26 #include <media/v4l2-subdev.h>
  27
  28 #define SH_CSI2_TREF    0x00
  29 #define SH_CSI2_SRST    0x04
  30 #define SH_CSI2_PHYCNT  0x08
  31 #define SH_CSI2_CHKSUM  0x0C
  32 #define SH_CSI2_VCDT    0x10
  33
  34 struct sh_csi2 {
  35         struct v4l2_subdev              subdev;
  36         struct list_head                list;
  37         unsigned int                    irq;
  38         void __iomem                    *base;
  39         struct platform_device          *pdev;
  40         struct sh_csi2_client_config    *client;
  41         unsigned long (*query_bus_param)(struct soc_camera_device *);
  42         int (*set_bus_param)(struct soc_camera_device *, unsigned long);
  43 };
  44
  45 static int sh_csi2_try_fmt(struct v4l2_subdev *sd,
  46                            struct v4l2_mbus_framefmt *mf)
  47 {
  48         struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev);
  49         struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data;
  50
  51         if (mf->width > 8188)
  52                 mf->width = 8188;
  53         else if (mf->width & 1)
  54                 mf->width &= ~1;
  55
  56         switch (pdata->type) {
  57         case SH_CSI2C:
  58                 switch (mf->code) {
  59                 case V4L2_MBUS_FMT_UYVY8_2X8:           /* YUV422 */
  60                 case V4L2_MBUS_FMT_YUYV8_1_5X8:         /* YUV420 */
  61                 case V4L2_MBUS_FMT_Y8_1X8:              /* RAW8 */
  62                 case V4L2_MBUS_FMT_SBGGR8_1X8:
  63                 case V4L2_MBUS_FMT_SGRBG8_1X8:
  64                         break;
  65                 default:
  66                         /* All MIPI CSI-2 devices must support one of primary formats */
  67                         mf->code = V4L2_MBUS_FMT_YUYV8_2X8;
  68                 }
  69                 break;
  70         case SH_CSI2I:
  71                 switch (mf->code) {
  72                 case V4L2_MBUS_FMT_Y8_1X8:              /* RAW8 */
  73                 case V4L2_MBUS_FMT_SBGGR8_1X8:
  74                 case V4L2_MBUS_FMT_SGRBG8_1X8:
  75                 case V4L2_MBUS_FMT_SBGGR10_1X10:        /* RAW10 */
  76                 case V4L2_MBUS_FMT_SBGGR12_1X12:        /* RAW12 */
  77                         break;
  78                 default:
  79                         /* All MIPI CSI-2 devices must support one of primary formats */
  80                         mf->code = V4L2_MBUS_FMT_SBGGR8_1X8;
  81                 }
  82                 break;
  83         }
  84
  85         return 0;
  86 }
  87
  88 /*
  89  * We have done our best in try_fmt to try and tell the sensor, which formats
  90  * we support. If now the configuration is unsuitable for us we can only
  91  * error out.
  92  */
  93 static int sh_csi2_s_fmt(struct v4l2_subdev *sd,
  94                          struct v4l2_mbus_framefmt *mf)
  95 {
  96         struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev);
  97         u32 tmp = (priv->client->channel & 3) << 8;
  98
  99         dev_dbg(sd->v4l2_dev->dev, "%s(%u)\n", __func__, mf->code);
 100         if (mf->width > 8188 || mf->width & 1)
 101                 return -EINVAL;
 102
 103         switch (mf->code) {
 104         case V4L2_MBUS_FMT_UYVY8_2X8:
 105                 tmp |= 0x1e;    /* YUV422 8 bit */
 106                 break;
 107         case V4L2_MBUS_FMT_YUYV8_1_5X8:
 108                 tmp |= 0x18;    /* YUV420 8 bit */
 109                 break;
 110         case V4L2_MBUS_FMT_RGB555_2X8_PADHI_BE:
 111                 tmp |= 0x21;    /* RGB555 */
 112                 break;
 113         case V4L2_MBUS_FMT_RGB565_2X8_BE:
 114                 tmp |= 0x22;    /* RGB565 */
 115                 break;
 116         case V4L2_MBUS_FMT_Y8_1X8:
 117         case V4L2_MBUS_FMT_SBGGR8_1X8:
 118         case V4L2_MBUS_FMT_SGRBG8_1X8:
 119                 tmp |= 0x2a;    /* RAW8 */
 120                 break;
 121         default:
 122                 return -EINVAL;
 123         }
 124
 125         iowrite32(tmp, priv->base + SH_CSI2_VCDT);
 126
 127         return 0;
 128 }
 129
 130 static struct v4l2_subdev_video_ops sh_csi2_subdev_video_ops = {
 131         .s_mbus_fmt     = sh_csi2_s_fmt,
 132         .try_mbus_fmt   = sh_csi2_try_fmt,
 133 };
 134
 135 static void sh_csi2_hwinit(struct sh_csi2 *priv)
 136 {
 137         struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data;
 138         __u32 tmp = 0x10; /* Enable MIPI CSI clock lane */
 139
 140         /* Reflect registers immediately */
 141         iowrite32(0x00000001, priv->base + SH_CSI2_TREF);
 142         /* reset CSI2 harware */
 143         iowrite32(0x00000001, priv->base + SH_CSI2_SRST);
 144         udelay(5);
 145         iowrite32(0x00000000, priv->base + SH_CSI2_SRST);
 146
 147         if (priv->client->lanes & 3)
 148                 tmp |= priv->client->lanes & 3;
 149         else
 150                 /* Default - both lanes */
 151                 tmp |= 3;
 152
 153         if (priv->client->phy == SH_CSI2_PHY_MAIN)
 154                 tmp |= 0x8000;
 155
 156         iowrite32(tmp, priv->base + SH_CSI2_PHYCNT);
 157
 158         tmp = 0;
 159         if (pdata->flags & SH_CSI2_ECC)
 160                 tmp |= 2;
 161         if (pdata->flags & SH_CSI2_CRC)
 162                 tmp |= 1;
 163         iowrite32(tmp, priv->base + SH_CSI2_CHKSUM);
 164 }
 165
 166 static int sh_csi2_set_bus_param(struct soc_camera_device *icd,
 167                                  unsigned long flags)
 168 {
 169         return 0;
 170 }
 171
 172 static unsigned long sh_csi2_query_bus_param(struct soc_camera_device *icd)
 173 {
 174         struct soc_camera_link *icl = to_soc_camera_link(icd);
 175         const unsigned long flags = SOCAM_PCLK_SAMPLE_RISING |
 176                 SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_HIGH |
 177                 SOCAM_MASTER | SOCAM_DATAWIDTH_8 | SOCAM_DATA_ACTIVE_HIGH;
 178
 179         return soc_camera_apply_sensor_flags(icl, flags);
 180 }
 181
 182 static int sh_csi2_client_connect(struct sh_csi2 *priv)
 183 {
 184         struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data;
 185         struct v4l2_subdev *sd, *csi2_sd = &priv->subdev;
 186         struct soc_camera_device *icd = NULL;
 187         struct device *dev = v4l2_get_subdevdata(&priv->subdev);
 188         int i;
 189
 190         v4l2_device_for_each_subdev(sd, csi2_sd->v4l2_dev)
 191                 if (sd->grp_id) {
 192                         icd = (struct soc_camera_device *)sd->grp_id;
 193                         break;
 194                 }
 195
 196         if (!icd)
 197                 return -EINVAL;
 198
 199         for (i = 0; i < pdata->num_clients; i++)
 200                 if (&pdata->clients[i].pdev->dev == icd->pdev)
 201                         break;
 202
 203         dev_dbg(dev, "%s(%p): found #%d\n", __func__, dev, i);
 204
 205         if (i == pdata->num_clients)
 206                 return -ENODEV;
 207
 208         priv->client = pdata->clients + i;
 209
 210         priv->set_bus_param             = icd->ops->set_bus_param;
 211         priv->query_bus_param           = icd->ops->query_bus_param;
 212         icd->ops->set_bus_param         = sh_csi2_set_bus_param;
 213         icd->ops->query_bus_param       = sh_csi2_query_bus_param;
 214
 215         csi2_sd->grp_id = (long)icd;
 216
 217         pm_runtime_get_sync(dev);
 218
 219         sh_csi2_hwinit(priv);
 220
 221         return 0;
 222 }
 223
 224 static void sh_csi2_client_disconnect(struct sh_csi2 *priv)
 225 {
 226         struct soc_camera_device *icd = (struct soc_camera_device *)priv->subdev.grp_id;
 227
 228         priv->client = NULL;
 229         priv->subdev.grp_id = 0;
 230
 231         /* Driver is about to be unbound */
 232         icd->ops->set_bus_param         = priv->set_bus_param;
 233         icd->ops->query_bus_param       = priv->query_bus_param;
 234         priv->set_bus_param             = NULL;
 235         priv->query_bus_param           = NULL;
 236
 237         pm_runtime_put(v4l2_get_subdevdata(&priv->subdev));
 238 }
 239
 240 static int sh_csi2_s_power(struct v4l2_subdev *sd, int on)
 241 {
 242         struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev);
 243
 244         if (on)
 245                 return sh_csi2_client_connect(priv);
 246
 247         sh_csi2_client_disconnect(priv);
 248         return 0;
 249 }
 250
 251 static struct v4l2_subdev_core_ops sh_csi2_subdev_core_ops = {
 252         .s_power        = sh_csi2_s_power,
 253 };
 254
 255 static struct v4l2_subdev_ops sh_csi2_subdev_ops = {
 256         .core   = &sh_csi2_subdev_core_ops,
 257         .video  = &sh_csi2_subdev_video_ops,
 258 };
 259
 260 static __devinit int sh_csi2_probe(struct platform_device *pdev)
 261 {
 262         struct resource *res;
 263         unsigned int irq;
 264         int ret;
 265         struct sh_csi2 *priv;
 266         /* Platform data specify the PHY, lanes, ECC, CRC */
 267         struct sh_csi2_pdata *pdata = pdev->dev.platform_data;
 268
 269         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 270         /* Interrupt unused so far */
 271         irq = platform_get_irq(pdev, 0);
 272
 273         if (!res || (int)irq <= 0 || !pdata) {
 274                 dev_err(&pdev->dev, "Not enough CSI2 platform resources.\n");
 275                 return -ENODEV;
 276         }
 277
 278         /* TODO: Add support for CSI2I. Careful: different register layout! */
 279         if (pdata->type != SH_CSI2C) {
 280                 dev_err(&pdev->dev, "Only CSI2C supported ATM.\n");
 281                 return -EINVAL;
 282         }
 283
 284         priv = kzalloc(sizeof(struct sh_csi2), GFP_KERNEL);
 285         if (!priv)
 286                 return -ENOMEM;
 287
 288         priv->irq = irq;
 289
 290         if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
 291                 dev_err(&pdev->dev, "CSI2 register region already claimed\n");
 292                 ret = -EBUSY;
 293                 goto ereqreg;
 294         }
 295
 296         priv->base = ioremap(res->start, resource_size(res));
 297         if (!priv->base) {
 298                 ret = -ENXIO;
 299                 dev_err(&pdev->dev, "Unable to ioremap CSI2 registers.\n");
 300                 goto eremap;
 301         }
 302
 303         priv->pdev = pdev;
 304         platform_set_drvdata(pdev, priv);
 305
 306         v4l2_subdev_init(&priv->subdev, &sh_csi2_subdev_ops);
 307         v4l2_set_subdevdata(&priv->subdev, &pdev->dev);
 308
 309         snprintf(priv->subdev.name, V4L2_SUBDEV_NAME_SIZE, "%s.mipi-csi",
 310                  dev_name(pdata->v4l2_dev->dev));
 311         ret = v4l2_device_register_subdev(pdata->v4l2_dev, &priv->subdev);
 312         dev_dbg(&pdev->dev, "%s(%p): ret(register_subdev) = %d\n", __func__, priv, ret);
 313         if (ret < 0)
 314                 goto esdreg;
 315
 316         pm_runtime_enable(&pdev->dev);
 317
 318         dev_dbg(&pdev->dev, "CSI2 probed.\n");
 319
 320         return 0;
 321
 322 esdreg:
 323         iounmap(priv->base);
 324 eremap:
 325         release_mem_region(res->start, resource_size(res));
 326 ereqreg:
 327         kfree(priv);
 328
 329         return ret;
 330 }
 331
 332 static __devexit int sh_csi2_remove(struct platform_device *pdev)
 333 {
 334         struct sh_csi2 *priv = platform_get_drvdata(pdev);
 335         struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 336
 337         v4l2_device_unregister_subdev(&priv->subdev);
 338         pm_runtime_disable(&pdev->dev);
 339         iounmap(priv->base);
 340         release_mem_region(res->start, resource_size(res));
 341         platform_set_drvdata(pdev, NULL);
 342         kfree(priv);
 343
 344         return 0;
 345 }
 346
 347 static struct platform_driver __refdata sh_csi2_pdrv = {
 348         .remove = __devexit_p(sh_csi2_remove),
 349         .probe  = sh_csi2_probe,
 350         .driver = {
 351                 .name   = "sh-mobile-csi2",
 352                 .owner  = THIS_MODULE,
 353         },
 354 };
 355
 356 static int __init sh_csi2_init(void)
 357 {
 358         return platform_driver_register(&sh_csi2_pdrv);
 359 }
 360
 361 static void __exit sh_csi2_exit(void)
 362 {
 363         platform_driver_unregister(&sh_csi2_pdrv);
 364 }
 365
 366 module_init(sh_csi2_init);
 367 module_exit(sh_csi2_exit);
 368
 369 MODULE_DESCRIPTION("SH-Mobile MIPI CSI-2 driver");
 370 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
 371 MODULE_LICENSE("GPL v2");
 372 MODULE_ALIAS("platform:sh-mobile-csi2");