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_csi2.h>
  20 #include <media/soc_camera.h>
  21 #include <media/v4l2-common.h>
  22 #include <media/v4l2-dev.h>
  23 #include <media/v4l2-device.h>
  24 #include <media/v4l2-mediabus.h>
  25 #include <media/v4l2-subdev.h>
  26
  27 #define SH_CSI2_TREF    0x00
  28 #define SH_CSI2_SRST    0x04
  29 #define SH_CSI2_PHYCNT  0x08
  30 #define SH_CSI2_CHKSUM  0x0C
  31 #define SH_CSI2_VCDT    0x10
  32
  33 struct sh_csi2 {
  34         struct v4l2_subdev              subdev;
  35         struct list_head                list;
  36         struct notifier_block           notifier;
  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 struct v4l2_subdev_core_ops sh_csi2_subdev_core_ops;
 136
 137 static struct v4l2_subdev_ops sh_csi2_subdev_ops = {
 138         .core   = &sh_csi2_subdev_core_ops,
 139         .video  = &sh_csi2_subdev_video_ops,
 140 };
 141
 142 static void sh_csi2_hwinit(struct sh_csi2 *priv)
 143 {
 144         struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data;
 145         __u32 tmp = 0x10; /* Enable MIPI CSI clock lane */
 146
 147         /* Reflect registers immediately */
 148         iowrite32(0x00000001, priv->base + SH_CSI2_TREF);
 149         /* reset CSI2 harware */
 150         iowrite32(0x00000001, priv->base + SH_CSI2_SRST);
 151         udelay(5);
 152         iowrite32(0x00000000, priv->base + SH_CSI2_SRST);
 153
 154         if (priv->client->lanes & 3)
 155                 tmp |= priv->client->lanes & 3;
 156         else
 157                 /* Default - both lanes */
 158                 tmp |= 3;
 159
 160         if (priv->client->phy == SH_CSI2_PHY_MAIN)
 161                 tmp |= 0x8000;
 162
 163         iowrite32(tmp, priv->base + SH_CSI2_PHYCNT);
 164
 165         tmp = 0;
 166         if (pdata->flags & SH_CSI2_ECC)
 167                 tmp |= 2;
 168         if (pdata->flags & SH_CSI2_CRC)
 169                 tmp |= 1;
 170         iowrite32(tmp, priv->base + SH_CSI2_CHKSUM);
 171 }
 172
 173 static int sh_csi2_set_bus_param(struct soc_camera_device *icd,
 174                                  unsigned long flags)
 175 {
 176         return 0;
 177 }
 178
 179 static unsigned long sh_csi2_query_bus_param(struct soc_camera_device *icd)
 180 {
 181         struct soc_camera_link *icl = to_soc_camera_link(icd);
 182         const unsigned long flags = SOCAM_PCLK_SAMPLE_RISING |
 183                 SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_HIGH |
 184                 SOCAM_MASTER | SOCAM_DATAWIDTH_8 | SOCAM_DATA_ACTIVE_HIGH;
 185
 186         return soc_camera_apply_sensor_flags(icl, flags);
 187 }
 188
 189 static int sh_csi2_notify(struct notifier_block *nb,
 190                           unsigned long action, void *data)
 191 {
 192         struct device *dev = data;
 193         struct soc_camera_device *icd = to_soc_camera_dev(dev);
 194         struct v4l2_device *v4l2_dev = dev_get_drvdata(dev->parent);
 195         struct sh_csi2 *priv =
 196                 container_of(nb, struct sh_csi2, notifier);
 197         struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data;
 198         int ret, i;
 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): action = %lu, found #%d\n", __func__, dev, action, i);
 205
 206         if (i == pdata->num_clients)
 207                 return NOTIFY_DONE;
 208
 209         switch (action) {
 210         case BUS_NOTIFY_BOUND_DRIVER:
 211                 snprintf(priv->subdev.name, V4L2_SUBDEV_NAME_SIZE, "%s%s",
 212                          dev_name(v4l2_dev->dev), ".mipi-csi");
 213                 priv->subdev.grp_id = (long)icd;
 214                 ret = v4l2_device_register_subdev(v4l2_dev, &priv->subdev);
 215                 dev_dbg(dev, "%s(%p): ret(register_subdev) = %d\n", __func__, priv, ret);
 216                 if (ret < 0)
 217                         return NOTIFY_DONE;
 218
 219                 priv->client = pdata->clients + i;
 220
 221                 priv->set_bus_param             = icd->ops->set_bus_param;
 222                 priv->query_bus_param           = icd->ops->query_bus_param;
 223                 icd->ops->set_bus_param         = sh_csi2_set_bus_param;
 224                 icd->ops->query_bus_param       = sh_csi2_query_bus_param;
 225
 226                 pm_runtime_get_sync(v4l2_get_subdevdata(&priv->subdev));
 227
 228                 sh_csi2_hwinit(priv);
 229                 break;
 230         case BUS_NOTIFY_UNBIND_DRIVER:
 231                 priv->client = NULL;
 232
 233                 /* Driver is about to be unbound */
 234                 icd->ops->set_bus_param         = priv->set_bus_param;
 235                 icd->ops->query_bus_param       = priv->query_bus_param;
 236                 priv->set_bus_param             = NULL;
 237                 priv->query_bus_param           = NULL;
 238
 239                 v4l2_device_unregister_subdev(&priv->subdev);
 240
 241                 pm_runtime_put(v4l2_get_subdevdata(&priv->subdev));
 242                 break;
 243         }
 244
 245         return NOTIFY_OK;
 246 }
 247
 248 static __devinit int sh_csi2_probe(struct platform_device *pdev)
 249 {
 250         struct resource *res;
 251         unsigned int irq;
 252         int ret;
 253         struct sh_csi2 *priv;
 254         /* Platform data specify the PHY, lanes, ECC, CRC */
 255         struct sh_csi2_pdata *pdata = pdev->dev.platform_data;
 256
 257         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 258         /* Interrupt unused so far */
 259         irq = platform_get_irq(pdev, 0);
 260
 261         if (!res || (int)irq <= 0 || !pdata) {
 262                 dev_err(&pdev->dev, "Not enough CSI2 platform resources.\n");
 263                 return -ENODEV;
 264         }
 265
 266         /* TODO: Add support for CSI2I. Careful: different register layout! */
 267         if (pdata->type != SH_CSI2C) {
 268                 dev_err(&pdev->dev, "Only CSI2C supported ATM.\n");
 269                 return -EINVAL;
 270         }
 271
 272         priv = kzalloc(sizeof(struct sh_csi2), GFP_KERNEL);
 273         if (!priv)
 274                 return -ENOMEM;
 275
 276         priv->irq = irq;
 277         priv->notifier.notifier_call = sh_csi2_notify;
 278
 279         /* We MUST attach after the MIPI sensor */
 280         ret = bus_register_notifier(&soc_camera_bus_type, &priv->notifier);
 281         if (ret < 0) {
 282                 dev_err(&pdev->dev, "CSI2 cannot register notifier\n");
 283                 goto ernotify;
 284         }
 285
 286         if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
 287                 dev_err(&pdev->dev, "CSI2 register region already claimed\n");
 288                 ret = -EBUSY;
 289                 goto ereqreg;
 290         }
 291
 292         priv->base = ioremap(res->start, resource_size(res));
 293         if (!priv->base) {
 294                 ret = -ENXIO;
 295                 dev_err(&pdev->dev, "Unable to ioremap CSI2 registers.\n");
 296                 goto eremap;
 297         }
 298
 299         priv->pdev = pdev;
 300
 301         v4l2_subdev_init(&priv->subdev, &sh_csi2_subdev_ops);
 302         v4l2_set_subdevdata(&priv->subdev, &pdev->dev);
 303
 304         platform_set_drvdata(pdev, priv);
 305
 306         pm_runtime_enable(&pdev->dev);
 307
 308         dev_dbg(&pdev->dev, "CSI2 probed.\n");
 309
 310         return 0;
 311
 312 eremap:
 313         release_mem_region(res->start, resource_size(res));
 314 ereqreg:
 315         bus_unregister_notifier(&soc_camera_bus_type, &priv->notifier);
 316 ernotify:
 317         kfree(priv);
 318
 319         return ret;
 320 }
 321
 322 static __devexit int sh_csi2_remove(struct platform_device *pdev)
 323 {
 324         struct sh_csi2 *priv = platform_get_drvdata(pdev);
 325         struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 326
 327         bus_unregister_notifier(&soc_camera_bus_type, &priv->notifier);
 328         pm_runtime_disable(&pdev->dev);
 329         iounmap(priv->base);
 330         release_mem_region(res->start, resource_size(res));
 331         platform_set_drvdata(pdev, NULL);
 332         kfree(priv);
 333
 334         return 0;
 335 }
 336
 337 static struct platform_driver __refdata sh_csi2_pdrv = {
 338         .remove  = __devexit_p(sh_csi2_remove),
 339         .driver  = {
 340                 .name   = "sh-mobile-csi2",
 341                 .owner  = THIS_MODULE,
 342         },
 343 };
 344
 345 static int __init sh_csi2_init(void)
 346 {
 347         return platform_driver_probe(&sh_csi2_pdrv, sh_csi2_probe);
 348 }
 349
 350 static void __exit sh_csi2_exit(void)
 351 {
 352         platform_driver_unregister(&sh_csi2_pdrv);
 353 }
 354
 355 module_init(sh_csi2_init);
 356 module_exit(sh_csi2_exit);
 357
 358 MODULE_DESCRIPTION("SH-Mobile MIPI CSI-2 driver");
 359 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
 360 MODULE_LICENSE("GPL v2");
 361 MODULE_ALIAS("platform:sh-mobile-csi2");