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Linux/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/err.h>
 13 #include <linux/i2c.h>
 14 #include <linux/io.h>
 15 #include <linux/platform_device.h>
 16 #include <linux/pm_runtime.h>
 17 #include <linux/slab.h>
 18 #include <linux/videodev2.h>
 19 #include <linux/module.h>
 20 
 21 #include <media/sh_mobile_ceu.h>
 22 #include <media/sh_mobile_csi2.h>
 23 #include <media/soc_camera.h>
 24 #include <media/soc_mediabus.h>
 25 #include <media/v4l2-common.h>
 26 #include <media/v4l2-dev.h>
 27 #include <media/v4l2-device.h>
 28 #include <media/v4l2-mediabus.h>
 29 #include <media/v4l2-subdev.h>
 30 
 31 #define SH_CSI2_TREF    0x00
 32 #define SH_CSI2_SRST    0x04
 33 #define SH_CSI2_PHYCNT  0x08
 34 #define SH_CSI2_CHKSUM  0x0C
 35 #define SH_CSI2_VCDT    0x10
 36 
 37 struct sh_csi2 {
 38         struct v4l2_subdev              subdev;
 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 void sh_csi2_hwinit(struct sh_csi2 *priv);
 47 
 48 static int sh_csi2_try_fmt(struct v4l2_subdev *sd,
 49                            struct v4l2_mbus_framefmt *mf)
 50 {
 51         struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev);
 52         struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data;
 53 
 54         if (mf->width > 8188)
 55                 mf->width = 8188;
 56         else if (mf->width & 1)
 57                 mf->width &= ~1;
 58 
 59         switch (pdata->type) {
 60         case SH_CSI2C:
 61                 switch (mf->code) {
 62                 case V4L2_MBUS_FMT_UYVY8_2X8:           /* YUV422 */
 63                 case V4L2_MBUS_FMT_YUYV8_1_5X8:         /* YUV420 */
 64                 case V4L2_MBUS_FMT_Y8_1X8:              /* RAW8 */
 65                 case V4L2_MBUS_FMT_SBGGR8_1X8:
 66                 case V4L2_MBUS_FMT_SGRBG8_1X8:
 67                         break;
 68                 default:
 69                         /* All MIPI CSI-2 devices must support one of primary formats */
 70                         mf->code = V4L2_MBUS_FMT_YUYV8_2X8;
 71                 }
 72                 break;
 73         case SH_CSI2I:
 74                 switch (mf->code) {
 75                 case V4L2_MBUS_FMT_Y8_1X8:              /* RAW8 */
 76                 case V4L2_MBUS_FMT_SBGGR8_1X8:
 77                 case V4L2_MBUS_FMT_SGRBG8_1X8:
 78                 case V4L2_MBUS_FMT_SBGGR10_1X10:        /* RAW10 */
 79                 case V4L2_MBUS_FMT_SBGGR12_1X12:        /* RAW12 */
 80                         break;
 81                 default:
 82                         /* All MIPI CSI-2 devices must support one of primary formats */
 83                         mf->code = V4L2_MBUS_FMT_SBGGR8_1X8;
 84                 }
 85                 break;
 86         }
 87 
 88         return 0;
 89 }
 90 
 91 /*
 92  * We have done our best in try_fmt to try and tell the sensor, which formats
 93  * we support. If now the configuration is unsuitable for us we can only
 94  * error out.
 95  */
 96 static int sh_csi2_s_fmt(struct v4l2_subdev *sd,
 97                          struct v4l2_mbus_framefmt *mf)
 98 {
 99         struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev);
100         u32 tmp = (priv->client->channel & 3) << 8;
101 
102         dev_dbg(sd->v4l2_dev->dev, "%s(%u)\n", __func__, mf->code);
103         if (mf->width > 8188 || mf->width & 1)
104                 return -EINVAL;
105 
106         switch (mf->code) {
107         case V4L2_MBUS_FMT_UYVY8_2X8:
108                 tmp |= 0x1e;    /* YUV422 8 bit */
109                 break;
110         case V4L2_MBUS_FMT_YUYV8_1_5X8:
111                 tmp |= 0x18;    /* YUV420 8 bit */
112                 break;
113         case V4L2_MBUS_FMT_RGB555_2X8_PADHI_BE:
114                 tmp |= 0x21;    /* RGB555 */
115                 break;
116         case V4L2_MBUS_FMT_RGB565_2X8_BE:
117                 tmp |= 0x22;    /* RGB565 */
118                 break;
119         case V4L2_MBUS_FMT_Y8_1X8:
120         case V4L2_MBUS_FMT_SBGGR8_1X8:
121         case V4L2_MBUS_FMT_SGRBG8_1X8:
122                 tmp |= 0x2a;    /* RAW8 */
123                 break;
124         default:
125                 return -EINVAL;
126         }
127 
128         iowrite32(tmp, priv->base + SH_CSI2_VCDT);
129 
130         return 0;
131 }
132 
133 static int sh_csi2_g_mbus_config(struct v4l2_subdev *sd,
134                                  struct v4l2_mbus_config *cfg)
135 {
136         struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev);
137 
138         if (!priv->mipi_flags) {
139                 struct soc_camera_device *icd = v4l2_get_subdev_hostdata(sd);
140                 struct v4l2_subdev *client_sd = soc_camera_to_subdev(icd);
141                 struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data;
142                 unsigned long common_flags, csi2_flags;
143                 struct v4l2_mbus_config client_cfg = {.type = V4L2_MBUS_CSI2,};
144                 int ret;
145 
146                 /* Check if we can support this camera */
147                 csi2_flags = V4L2_MBUS_CSI2_CONTINUOUS_CLOCK |
148                         V4L2_MBUS_CSI2_1_LANE;
149 
150                 switch (pdata->type) {
151                 case SH_CSI2C:
152                         if (priv->client->lanes != 1)
153                                 csi2_flags |= V4L2_MBUS_CSI2_2_LANE;
154                         break;
155                 case SH_CSI2I:
156                         switch (priv->client->lanes) {
157                         default:
158                                 csi2_flags |= V4L2_MBUS_CSI2_4_LANE;
159                         case 3:
160                                 csi2_flags |= V4L2_MBUS_CSI2_3_LANE;
161                         case 2:
162                                 csi2_flags |= V4L2_MBUS_CSI2_2_LANE;
163                         }
164                 }
165 
166                 ret = v4l2_subdev_call(client_sd, video, g_mbus_config, &client_cfg);
167                 if (ret == -ENOIOCTLCMD)
168                         common_flags = csi2_flags;
169                 else if (!ret)
170                         common_flags = soc_mbus_config_compatible(&client_cfg,
171                                                                   csi2_flags);
172                 else
173                         common_flags = 0;
174 
175                 if (!common_flags)
176                         return -EINVAL;
177 
178                 /* All good: camera MIPI configuration supported */
179                 priv->mipi_flags = common_flags;
180         }
181 
182         if (cfg) {
183                 cfg->flags = V4L2_MBUS_PCLK_SAMPLE_RISING |
184                         V4L2_MBUS_HSYNC_ACTIVE_HIGH | V4L2_MBUS_VSYNC_ACTIVE_HIGH |
185                         V4L2_MBUS_MASTER | V4L2_MBUS_DATA_ACTIVE_HIGH;
186                 cfg->type = V4L2_MBUS_PARALLEL;
187         }
188 
189         return 0;
190 }
191 
192 static int sh_csi2_s_mbus_config(struct v4l2_subdev *sd,
193                                  const struct v4l2_mbus_config *cfg)
194 {
195         struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev);
196         struct soc_camera_device *icd = v4l2_get_subdev_hostdata(sd);
197         struct v4l2_subdev *client_sd = soc_camera_to_subdev(icd);
198         struct v4l2_mbus_config client_cfg = {.type = V4L2_MBUS_CSI2,};
199         int ret = sh_csi2_g_mbus_config(sd, NULL);
200 
201         if (ret < 0)
202                 return ret;
203 
204         pm_runtime_get_sync(&priv->pdev->dev);
205 
206         sh_csi2_hwinit(priv);
207 
208         client_cfg.flags = priv->mipi_flags;
209 
210         return v4l2_subdev_call(client_sd, video, s_mbus_config, &client_cfg);
211 }
212 
213 static struct v4l2_subdev_video_ops sh_csi2_subdev_video_ops = {
214         .s_mbus_fmt     = sh_csi2_s_fmt,
215         .try_mbus_fmt   = sh_csi2_try_fmt,
216         .g_mbus_config  = sh_csi2_g_mbus_config,
217         .s_mbus_config  = sh_csi2_s_mbus_config,
218 };
219 
220 static void sh_csi2_hwinit(struct sh_csi2 *priv)
221 {
222         struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data;
223         __u32 tmp = 0x10; /* Enable MIPI CSI clock lane */
224 
225         /* Reflect registers immediately */
226         iowrite32(0x00000001, priv->base + SH_CSI2_TREF);
227         /* reset CSI2 harware */
228         iowrite32(0x00000001, priv->base + SH_CSI2_SRST);
229         udelay(5);
230         iowrite32(0x00000000, priv->base + SH_CSI2_SRST);
231 
232         switch (pdata->type) {
233         case SH_CSI2C:
234                 if (priv->client->lanes == 1)
235                         tmp |= 1;
236                 else
237                         /* Default - both lanes */
238                         tmp |= 3;
239                 break;
240         case SH_CSI2I:
241                 if (!priv->client->lanes || priv->client->lanes > 4)
242                         /* Default - all 4 lanes */
243                         tmp |= 0xf;
244                 else
245                         tmp |= (1 << priv->client->lanes) - 1;
246         }
247 
248         if (priv->client->phy == SH_CSI2_PHY_MAIN)
249                 tmp |= 0x8000;
250 
251         iowrite32(tmp, priv->base + SH_CSI2_PHYCNT);
252 
253         tmp = 0;
254         if (pdata->flags & SH_CSI2_ECC)
255                 tmp |= 2;
256         if (pdata->flags & SH_CSI2_CRC)
257                 tmp |= 1;
258         iowrite32(tmp, priv->base + SH_CSI2_CHKSUM);
259 }
260 
261 static int sh_csi2_client_connect(struct sh_csi2 *priv)
262 {
263         struct device *dev = v4l2_get_subdevdata(&priv->subdev);
264         struct sh_csi2_pdata *pdata = dev->platform_data;
265         struct soc_camera_device *icd = v4l2_get_subdev_hostdata(&priv->subdev);
266         int i;
267 
268         if (priv->client)
269                 return -EBUSY;
270 
271         for (i = 0; i < pdata->num_clients; i++)
272                 if ((pdata->clients[i].pdev &&
273                      &pdata->clients[i].pdev->dev == icd->pdev) ||
274                     (icd->control &&
275                      strcmp(pdata->clients[i].name, dev_name(icd->control))))
276                         break;
277 
278         dev_dbg(dev, "%s(%p): found #%d\n", __func__, dev, i);
279 
280         if (i == pdata->num_clients)
281                 return -ENODEV;
282 
283         priv->client = pdata->clients + i;
284 
285         return 0;
286 }
287 
288 static void sh_csi2_client_disconnect(struct sh_csi2 *priv)
289 {
290         if (!priv->client)
291                 return;
292 
293         priv->client = NULL;
294 
295         pm_runtime_put(v4l2_get_subdevdata(&priv->subdev));
296 }
297 
298 static int sh_csi2_s_power(struct v4l2_subdev *sd, int on)
299 {
300         struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev);
301 
302         if (on)
303                 return sh_csi2_client_connect(priv);
304 
305         sh_csi2_client_disconnect(priv);
306         return 0;
307 }
308 
309 static struct v4l2_subdev_core_ops sh_csi2_subdev_core_ops = {
310         .s_power        = sh_csi2_s_power,
311 };
312 
313 static struct v4l2_subdev_ops sh_csi2_subdev_ops = {
314         .core   = &sh_csi2_subdev_core_ops,
315         .video  = &sh_csi2_subdev_video_ops,
316 };
317 
318 static int sh_csi2_probe(struct platform_device *pdev)
319 {
320         struct resource *res;
321         unsigned int irq;
322         int ret;
323         struct sh_csi2 *priv;
324         /* Platform data specify the PHY, lanes, ECC, CRC */
325         struct sh_csi2_pdata *pdata = pdev->dev.platform_data;
326 
327         if (!pdata)
328                 return -EINVAL;
329 
330         priv = devm_kzalloc(&pdev->dev, sizeof(struct sh_csi2), GFP_KERNEL);
331         if (!priv)
332                 return -ENOMEM;
333 
334         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
335         /* Interrupt unused so far */
336         irq = platform_get_irq(pdev, 0);
337 
338         if (!res || (int)irq <= 0) {
339                 dev_err(&pdev->dev, "Not enough CSI2 platform resources.\n");
340                 return -ENODEV;
341         }
342 
343         /* TODO: Add support for CSI2I. Careful: different register layout! */
344         if (pdata->type != SH_CSI2C) {
345                 dev_err(&pdev->dev, "Only CSI2C supported ATM.\n");
346                 return -EINVAL;
347         }
348 
349         priv->irq = irq;
350 
351         priv->base = devm_ioremap_resource(&pdev->dev, res);
352         if (IS_ERR(priv->base))
353                 return PTR_ERR(priv->base);
354 
355         priv->pdev = pdev;
356         priv->subdev.owner = THIS_MODULE;
357         priv->subdev.dev = &pdev->dev;
358         platform_set_drvdata(pdev, &priv->subdev);
359 
360         v4l2_subdev_init(&priv->subdev, &sh_csi2_subdev_ops);
361         v4l2_set_subdevdata(&priv->subdev, &pdev->dev);
362 
363         snprintf(priv->subdev.name, V4L2_SUBDEV_NAME_SIZE, "%s.mipi-csi",
364                  dev_name(&pdev->dev));
365 
366         ret = v4l2_async_register_subdev(&priv->subdev);
367         if (ret < 0)
368                 return ret;
369 
370         pm_runtime_enable(&pdev->dev);
371 
372         dev_dbg(&pdev->dev, "CSI2 probed.\n");
373 
374         return 0;
375 }
376 
377 static int sh_csi2_remove(struct platform_device *pdev)
378 {
379         struct v4l2_subdev *subdev = platform_get_drvdata(pdev);
380         struct sh_csi2 *priv = container_of(subdev, struct sh_csi2, subdev);
381 
382         v4l2_async_unregister_subdev(&priv->subdev);
383         v4l2_device_unregister_subdev(subdev);
384         pm_runtime_disable(&pdev->dev);
385 
386         return 0;
387 }
388 
389 static struct platform_driver __refdata sh_csi2_pdrv = {
390         .remove = sh_csi2_remove,
391         .probe  = sh_csi2_probe,
392         .driver = {
393                 .name   = "sh-mobile-csi2",
394                 .owner  = THIS_MODULE,
395         },
396 };
397 
398 module_platform_driver(sh_csi2_pdrv);
399 
400 MODULE_DESCRIPTION("SH-Mobile MIPI CSI-2 driver");
401 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
402 MODULE_LICENSE("GPL v2");
403 MODULE_ALIAS("platform:sh-mobile-csi2");
404 

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