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 #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/v4l2-common.h>
  24 #include <media/v4l2-dev.h>
  25 #include <media/v4l2-device.h>
  26 #include <media/v4l2-mediabus.h>
  27 #include <media/v4l2-subdev.h>
  28
  29 #define SH_CSI2_TREF    0x00
  30 #define SH_CSI2_SRST    0x04
  31 #define SH_CSI2_PHYCNT  0x08
  32 #define SH_CSI2_CHKSUM  0x0C
  33 #define SH_CSI2_VCDT    0x10
  34
  35 struct sh_csi2 {
  36         struct v4l2_subdev              subdev;
  37         struct list_head                list;
  38         unsigned int                    irq;
  39         void __iomem                    *base;
  40         struct platform_device          *pdev;
  41         struct sh_csi2_client_config    *client;
  42         unsigned long (*query_bus_param)(struct soc_camera_device *);
  43         int (*set_bus_param)(struct soc_camera_device *, unsigned long);
  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 struct v4l2_subdev_video_ops sh_csi2_subdev_video_ops = {
 132         .s_mbus_fmt     = sh_csi2_s_fmt,
 133         .try_mbus_fmt   = sh_csi2_try_fmt,
 134 };
 135
 136 static void sh_csi2_hwinit(struct sh_csi2 *priv)
 137 {
 138         struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data;
 139         __u32 tmp = 0x10; /* Enable MIPI CSI clock lane */
 140
 141         /* Reflect registers immediately */
 142         iowrite32(0x00000001, priv->base + SH_CSI2_TREF);
 143         /* reset CSI2 harware */
 144         iowrite32(0x00000001, priv->base + SH_CSI2_SRST);
 145         udelay(5);
 146         iowrite32(0x00000000, priv->base + SH_CSI2_SRST);
 147
 148         if (priv->client->lanes & 3)
 149                 tmp |= priv->client->lanes & 3;
 150         else
 151                 /* Default - both lanes */
 152                 tmp |= 3;
 153
 154         if (priv->client->phy == SH_CSI2_PHY_MAIN)
 155                 tmp |= 0x8000;
 156
 157         iowrite32(tmp, priv->base + SH_CSI2_PHYCNT);
 158
 159         tmp = 0;
 160         if (pdata->flags & SH_CSI2_ECC)
 161                 tmp |= 2;
 162         if (pdata->flags & SH_CSI2_CRC)
 163                 tmp |= 1;
 164         iowrite32(tmp, priv->base + SH_CSI2_CHKSUM);
 165 }
 166
 167 static int sh_csi2_set_bus_param(struct soc_camera_device *icd,
 168                                  unsigned long flags)
 169 {
 170         return 0;
 171 }
 172
 173 static unsigned long sh_csi2_query_bus_param(struct soc_camera_device *icd)
 174 {
 175         struct soc_camera_link *icl = to_soc_camera_link(icd);
 176         const unsigned long flags = SOCAM_PCLK_SAMPLE_RISING |
 177                 SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_HIGH |
 178                 SOCAM_MASTER | SOCAM_DATAWIDTH_8 | SOCAM_DATA_ACTIVE_HIGH;
 179
 180         return soc_camera_apply_sensor_flags(icl, flags);
 181 }
 182
 183 static int sh_csi2_client_connect(struct sh_csi2 *priv)
 184 {
 185         struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data;
 186         struct v4l2_subdev *sd, *csi2_sd = &priv->subdev;
 187         struct soc_camera_device *icd = NULL;
 188         struct device *dev = v4l2_get_subdevdata(&priv->subdev);
 189         int i;
 190
 191         v4l2_device_for_each_subdev(sd, csi2_sd->v4l2_dev)
 192                 if (sd->grp_id) {
 193                         icd = (struct soc_camera_device *)sd->grp_id;
 194                         break;
 195                 }
 196
 197         if (!icd)
 198                 return -EINVAL;
 199
 200         for (i = 0; i < pdata->num_clients; i++)
 201                 if (&pdata->clients[i].pdev->dev == icd->pdev)
 202                         break;
 203
 204         dev_dbg(dev, "%s(%p): found #%d\n", __func__, dev, i);
 205
 206         if (i == pdata->num_clients)
 207                 return -ENODEV;
 208
 209         priv->client = pdata->clients + i;
 210
 211         priv->set_bus_param             = icd->ops->set_bus_param;
 212         priv->query_bus_param           = icd->ops->query_bus_param;
 213         icd->ops->set_bus_param         = sh_csi2_set_bus_param;
 214         icd->ops->query_bus_param       = sh_csi2_query_bus_param;
 215
 216         csi2_sd->grp_id = (long)icd;
 217
 218         pm_runtime_get_sync(dev);
 219
 220         sh_csi2_hwinit(priv);
 221
 222         return 0;
 223 }
 224
 225 static void sh_csi2_client_disconnect(struct sh_csi2 *priv)
 226 {
 227         struct soc_camera_device *icd = (struct soc_camera_device *)priv->subdev.grp_id;
 228
 229         priv->client = NULL;
 230         priv->subdev.grp_id = 0;
 231
 232         /* Driver is about to be unbound */
 233         icd->ops->set_bus_param         = priv->set_bus_param;
 234         icd->ops->query_bus_param       = priv->query_bus_param;
 235         priv->set_bus_param             = NULL;
 236         priv->query_bus_param           = NULL;
 237
 238         pm_runtime_put(v4l2_get_subdevdata(&priv->subdev));
 239 }
 240
 241 static int sh_csi2_s_power(struct v4l2_subdev *sd, int on)
 242 {
 243         struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev);
 244
 245         if (on)
 246                 return sh_csi2_client_connect(priv);
 247
 248         sh_csi2_client_disconnect(priv);
 249         return 0;
 250 }
 251
 252 static struct v4l2_subdev_core_ops sh_csi2_subdev_core_ops = {
 253         .s_power        = sh_csi2_s_power,
 254 };
 255
 256 static struct v4l2_subdev_ops sh_csi2_subdev_ops = {
 257         .core   = &sh_csi2_subdev_core_ops,
 258         .video  = &sh_csi2_subdev_video_ops,
 259 };
 260
 261 static __devinit int sh_csi2_probe(struct platform_device *pdev)
 262 {
 263         struct resource *res;
 264         unsigned int irq;
 265         int ret;
 266         struct sh_csi2 *priv;
 267         /* Platform data specify the PHY, lanes, ECC, CRC */
 268         struct sh_csi2_pdata *pdata = pdev->dev.platform_data;
 269
 270         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 271         /* Interrupt unused so far */
 272         irq = platform_get_irq(pdev, 0);
 273
 274         if (!res || (int)irq <= 0 || !pdata) {
 275                 dev_err(&pdev->dev, "Not enough CSI2 platform resources.\n");
 276                 return -ENODEV;
 277         }
 278
 279         /* TODO: Add support for CSI2I. Careful: different register layout! */
 280         if (pdata->type != SH_CSI2C) {
 281                 dev_err(&pdev->dev, "Only CSI2C supported ATM.\n");
 282                 return -EINVAL;
 283         }
 284
 285         priv = kzalloc(sizeof(struct sh_csi2), GFP_KERNEL);
 286         if (!priv)
 287                 return -ENOMEM;
 288
 289         priv->irq = irq;
 290
 291         if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
 292                 dev_err(&pdev->dev, "CSI2 register region already claimed\n");
 293                 ret = -EBUSY;
 294                 goto ereqreg;
 295         }
 296
 297         priv->base = ioremap(res->start, resource_size(res));
 298         if (!priv->base) {
 299                 ret = -ENXIO;
 300                 dev_err(&pdev->dev, "Unable to ioremap CSI2 registers.\n");
 301                 goto eremap;
 302         }
 303
 304         priv->pdev = pdev;
 305         platform_set_drvdata(pdev, priv);
 306
 307         v4l2_subdev_init(&priv->subdev, &sh_csi2_subdev_ops);
 308         v4l2_set_subdevdata(&priv->subdev, &pdev->dev);
 309
 310         snprintf(priv->subdev.name, V4L2_SUBDEV_NAME_SIZE, "%s.mipi-csi",
 311                  dev_name(pdata->v4l2_dev->dev));
 312         ret = v4l2_device_register_subdev(pdata->v4l2_dev, &priv->subdev);
 313         dev_dbg(&pdev->dev, "%s(%p): ret(register_subdev) = %d\n", __func__, priv, ret);
 314         if (ret < 0)
 315                 goto esdreg;
 316
 317         pm_runtime_enable(&pdev->dev);
 318
 319         dev_dbg(&pdev->dev, "CSI2 probed.\n");
 320
 321         return 0;
 322
 323 esdreg:
 324         iounmap(priv->base);
 325 eremap:
 326         release_mem_region(res->start, resource_size(res));
 327 ereqreg:
 328         kfree(priv);
 329
 330         return ret;
 331 }
 332
 333 static __devexit int sh_csi2_remove(struct platform_device *pdev)
 334 {
 335         struct sh_csi2 *priv = platform_get_drvdata(pdev);
 336         struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 337
 338         v4l2_device_unregister_subdev(&priv->subdev);
 339         pm_runtime_disable(&pdev->dev);
 340         iounmap(priv->base);
 341         release_mem_region(res->start, resource_size(res));
 342         platform_set_drvdata(pdev, NULL);
 343         kfree(priv);
 344
 345         return 0;
 346 }
 347
 348 static struct platform_driver __refdata sh_csi2_pdrv = {
 349         .remove = __devexit_p(sh_csi2_remove),
 350         .probe  = sh_csi2_probe,
 351         .driver = {
 352                 .name   = "sh-mobile-csi2",
 353                 .owner  = THIS_MODULE,
 354         },
 355 };
 356
 357 static int __init sh_csi2_init(void)
 358 {
 359         return platform_driver_register(&sh_csi2_pdrv);
 360 }
 361
 362 static void __exit sh_csi2_exit(void)
 363 {
 364         platform_driver_unregister(&sh_csi2_pdrv);
 365 }
 366
 367 module_init(sh_csi2_init);
 368 module_exit(sh_csi2_exit);
 369
 370 MODULE_DESCRIPTION("SH-Mobile MIPI CSI-2 driver");
 371 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
 372 MODULE_LICENSE("GPL v2");
 373 MODULE_ALIAS("platform:sh-mobile-csi2");