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[media] V4L: sh_mobile_csi2: do not guess the client, the host tells us
[linux-2.6.git] / drivers / media / video / sh_mobile_csi2.c
blob91c680a728498ece068d4fc932ecc4744a1baba0
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/soc_mediabus.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 unsigned long mipi_flags;
40 void __iomem *base;
41 struct platform_device *pdev;
42 struct sh_csi2_client_config *client;
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 int sh_csi2_g_mbus_config(struct v4l2_subdev *sd,
131 struct v4l2_mbus_config *cfg)
132 {
133 cfg->flags = V4L2_MBUS_PCLK_SAMPLE_RISING |
134 V4L2_MBUS_HSYNC_ACTIVE_HIGH | V4L2_MBUS_VSYNC_ACTIVE_HIGH |
135 V4L2_MBUS_MASTER | V4L2_MBUS_DATA_ACTIVE_HIGH;
136 cfg->type = V4L2_MBUS_PARALLEL;
137
138 return 0;
139 }
140
141 static int sh_csi2_s_mbus_config(struct v4l2_subdev *sd,
142 const struct v4l2_mbus_config *cfg)
143 {
144 struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev);
145 struct soc_camera_device *icd = (struct soc_camera_device *)sd->grp_id;
146 struct v4l2_subdev *client_sd = soc_camera_to_subdev(icd);
147 struct v4l2_mbus_config client_cfg = {.type = V4L2_MBUS_CSI2,
148 .flags = priv->mipi_flags};
149
150 return v4l2_subdev_call(client_sd, video, s_mbus_config, &client_cfg);
151 }
152
153 static struct v4l2_subdev_video_ops sh_csi2_subdev_video_ops = {
154 .s_mbus_fmt = sh_csi2_s_fmt,
155 .try_mbus_fmt = sh_csi2_try_fmt,
156 .g_mbus_config = sh_csi2_g_mbus_config,
157 .s_mbus_config = sh_csi2_s_mbus_config,
158 };
159
160 static void sh_csi2_hwinit(struct sh_csi2 *priv)
161 {
162 struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data;
163 __u32 tmp = 0x10; /* Enable MIPI CSI clock lane */
164
165 /* Reflect registers immediately */
166 iowrite32(0x00000001, priv->base + SH_CSI2_TREF);
167 /* reset CSI2 harware */
168 iowrite32(0x00000001, priv->base + SH_CSI2_SRST);
169 udelay(5);
170 iowrite32(0x00000000, priv->base + SH_CSI2_SRST);
171
172 switch (pdata->type) {
173 case SH_CSI2C:
174 if (priv->client->lanes == 1)
175 tmp |= 1;
176 else
177 /* Default - both lanes */
178 tmp |= 3;
179 break;
180 case SH_CSI2I:
181 if (!priv->client->lanes || priv->client->lanes > 4)
182 /* Default - all 4 lanes */
183 tmp |= 0xf;
184 else
185 tmp |= (1 << priv->client->lanes) - 1;
186 }
187
188 if (priv->client->phy == SH_CSI2_PHY_MAIN)
189 tmp |= 0x8000;
190
191 iowrite32(tmp, priv->base + SH_CSI2_PHYCNT);
192
193 tmp = 0;
194 if (pdata->flags & SH_CSI2_ECC)
195 tmp |= 2;
196 if (pdata->flags & SH_CSI2_CRC)
197 tmp |= 1;
198 iowrite32(tmp, priv->base + SH_CSI2_CHKSUM);
199 }
200
201 static int sh_csi2_client_connect(struct sh_csi2 *priv)
202 {
203 struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data;
204 struct soc_camera_device *icd = (struct soc_camera_device *)priv->subdev.grp_id;
205 struct v4l2_subdev *client_sd = soc_camera_to_subdev(icd);
206 struct device *dev = v4l2_get_subdevdata(&priv->subdev);
207 struct v4l2_mbus_config cfg;
208 unsigned long common_flags, csi2_flags;
209 int i, ret;
210
211 for (i = 0; i < pdata->num_clients; i++)
212 if (&pdata->clients[i].pdev->dev == icd->pdev)
213 break;
214
215 dev_dbg(dev, "%s(%p): found #%d\n", __func__, dev, i);
216
217 if (i == pdata->num_clients)
218 return -ENODEV;
219
220 /* Check if we can support this camera */
221 csi2_flags = V4L2_MBUS_CSI2_CONTINUOUS_CLOCK | V4L2_MBUS_CSI2_1_LANE;
222
223 switch (pdata->type) {
224 case SH_CSI2C:
225 if (pdata->clients[i].lanes != 1)
226 csi2_flags |= V4L2_MBUS_CSI2_2_LANE;
227 break;
228 case SH_CSI2I:
229 switch (pdata->clients[i].lanes) {
230 default:
231 csi2_flags |= V4L2_MBUS_CSI2_4_LANE;
232 case 3:
233 csi2_flags |= V4L2_MBUS_CSI2_3_LANE;
234 case 2:
235 csi2_flags |= V4L2_MBUS_CSI2_2_LANE;
236 }
237 }
238
239 cfg.type = V4L2_MBUS_CSI2;
240 ret = v4l2_subdev_call(client_sd, video, g_mbus_config, &cfg);
241 if (ret == -ENOIOCTLCMD)
242 common_flags = csi2_flags;
243 else if (!ret)
244 common_flags = soc_mbus_config_compatible(&cfg,
245 csi2_flags);
246 else
247 common_flags = 0;
248
249 if (!common_flags)
250 return -EINVAL;
251
252 /* All good: camera MIPI configuration supported */
253 priv->mipi_flags = common_flags;
254 priv->client = pdata->clients + i;
255
256 pm_runtime_get_sync(dev);
257
258 sh_csi2_hwinit(priv);
259
260 return 0;
261 }
262
263 static void sh_csi2_client_disconnect(struct sh_csi2 *priv)
264 {
265 priv->client = NULL;
266
267 pm_runtime_put(v4l2_get_subdevdata(&priv->subdev));
268 }
269
270 static int sh_csi2_s_power(struct v4l2_subdev *sd, int on)
271 {
272 struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev);
273
274 if (on)
275 return sh_csi2_client_connect(priv);
276
277 sh_csi2_client_disconnect(priv);
278 return 0;
279 }
280
281 static struct v4l2_subdev_core_ops sh_csi2_subdev_core_ops = {
282 .s_power = sh_csi2_s_power,
283 };
284
285 static struct v4l2_subdev_ops sh_csi2_subdev_ops = {
286 .core = &sh_csi2_subdev_core_ops,
287 .video = &sh_csi2_subdev_video_ops,
288 };
289
290 static __devinit int sh_csi2_probe(struct platform_device *pdev)
291 {
292 struct resource *res;
293 unsigned int irq;
294 int ret;
295 struct sh_csi2 *priv;
296 /* Platform data specify the PHY, lanes, ECC, CRC */
297 struct sh_csi2_pdata *pdata = pdev->dev.platform_data;
298
299 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
300 /* Interrupt unused so far */
301 irq = platform_get_irq(pdev, 0);
302
303 if (!res || (int)irq <= 0 || !pdata) {
304 dev_err(&pdev->dev, "Not enough CSI2 platform resources.\n");
305 return -ENODEV;
306 }
307
308 /* TODO: Add support for CSI2I. Careful: different register layout! */
309 if (pdata->type != SH_CSI2C) {
310 dev_err(&pdev->dev, "Only CSI2C supported ATM.\n");
311 return -EINVAL;
312 }
313
314 priv = kzalloc(sizeof(struct sh_csi2), GFP_KERNEL);
315 if (!priv)
316 return -ENOMEM;
317
318 priv->irq = irq;
319
320 if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
321 dev_err(&pdev->dev, "CSI2 register region already claimed\n");
322 ret = -EBUSY;
323 goto ereqreg;
324 }
325
326 priv->base = ioremap(res->start, resource_size(res));
327 if (!priv->base) {
328 ret = -ENXIO;
329 dev_err(&pdev->dev, "Unable to ioremap CSI2 registers.\n");
330 goto eremap;
331 }
332
333 priv->pdev = pdev;
334 platform_set_drvdata(pdev, priv);
335
336 v4l2_subdev_init(&priv->subdev, &sh_csi2_subdev_ops);
337 v4l2_set_subdevdata(&priv->subdev, &pdev->dev);
338
339 snprintf(priv->subdev.name, V4L2_SUBDEV_NAME_SIZE, "%s.mipi-csi",
340 dev_name(pdata->v4l2_dev->dev));
341 ret = v4l2_device_register_subdev(pdata->v4l2_dev, &priv->subdev);
342 dev_dbg(&pdev->dev, "%s(%p): ret(register_subdev) = %d\n", __func__, priv, ret);
343 if (ret < 0)
344 goto esdreg;
345
346 pm_runtime_enable(&pdev->dev);
347
348 dev_dbg(&pdev->dev, "CSI2 probed.\n");
349
350 return 0;
351
352 esdreg:
353 iounmap(priv->base);
354 eremap:
355 release_mem_region(res->start, resource_size(res));
356 ereqreg:
357 kfree(priv);
358
359 return ret;
360 }
361
362 static __devexit int sh_csi2_remove(struct platform_device *pdev)
363 {
364 struct sh_csi2 *priv = platform_get_drvdata(pdev);
365 struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
366
367 v4l2_device_unregister_subdev(&priv->subdev);
368 pm_runtime_disable(&pdev->dev);
369 iounmap(priv->base);
370 release_mem_region(res->start, resource_size(res));
371 platform_set_drvdata(pdev, NULL);
372 kfree(priv);
373
374 return 0;
375 }
376
377 static struct platform_driver __refdata sh_csi2_pdrv = {
378 .remove = __devexit_p(sh_csi2_remove),
379 .probe = sh_csi2_probe,
380 .driver = {
381 .name = "sh-mobile-csi2",
382 .owner = THIS_MODULE,
383 },
384 };
385
386 static int __init sh_csi2_init(void)
387 {
388 return platform_driver_register(&sh_csi2_pdrv);
389 }
390
391 static void __exit sh_csi2_exit(void)
392 {
393 platform_driver_unregister(&sh_csi2_pdrv);
394 }
395
396 module_init(sh_csi2_init);
397 module_exit(sh_csi2_exit);
398
399 MODULE_DESCRIPTION("SH-Mobile MIPI CSI-2 driver");
400 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
401 MODULE_LICENSE("GPL v2");
402 MODULE_ALIAS("platform:sh-mobile-csi2");
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