Merge branch 'fixes-hwmod-regression' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6.git] / 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/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 = (struct soc_camera_device *)sd->grp_id;
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 = (struct soc_camera_device *)priv->subdev.grp_id;
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 static int __init sh_csi2_init(void)
394 {
395         return platform_driver_register(&sh_csi2_pdrv);
396 }
397
398 static void __exit sh_csi2_exit(void)
399 {
400         platform_driver_unregister(&sh_csi2_pdrv);
401 }
402
403 module_init(sh_csi2_init);
404 module_exit(sh_csi2_exit);
405
406 MODULE_DESCRIPTION("SH-Mobile MIPI CSI-2 driver");
407 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
408 MODULE_LICENSE("GPL v2");
409 MODULE_ALIAS("platform:sh-mobile-csi2");