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[deliverable/linux.git] / 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");
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