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
sh_csi2_set_fmt(struct v4l2_subdev * sd,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_format * format)48 static int sh_csi2_set_fmt(struct v4l2_subdev *sd,
49 struct v4l2_subdev_pad_config *cfg,
50 struct v4l2_subdev_format *format)
51 {
52 struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev);
53 struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data;
54 struct v4l2_mbus_framefmt *mf = &format->format;
55 u32 tmp = (priv->client->channel & 3) << 8;
56
57 if (format->pad)
58 return -EINVAL;
59
60 if (mf->width > 8188)
61 mf->width = 8188;
62 else if (mf->width & 1)
63 mf->width &= ~1;
64
65 switch (pdata->type) {
66 case SH_CSI2C:
67 switch (mf->code) {
68 case MEDIA_BUS_FMT_UYVY8_2X8: /* YUV422 */
69 case MEDIA_BUS_FMT_YUYV8_1_5X8: /* YUV420 */
70 case MEDIA_BUS_FMT_Y8_1X8: /* RAW8 */
71 case MEDIA_BUS_FMT_SBGGR8_1X8:
72 case MEDIA_BUS_FMT_SGRBG8_1X8:
73 break;
74 default:
75 /* All MIPI CSI-2 devices must support one of primary formats */
76 mf->code = MEDIA_BUS_FMT_YUYV8_2X8;
77 }
78 break;
79 case SH_CSI2I:
80 switch (mf->code) {
81 case MEDIA_BUS_FMT_Y8_1X8: /* RAW8 */
82 case MEDIA_BUS_FMT_SBGGR8_1X8:
83 case MEDIA_BUS_FMT_SGRBG8_1X8:
84 case MEDIA_BUS_FMT_SBGGR10_1X10: /* RAW10 */
85 case MEDIA_BUS_FMT_SBGGR12_1X12: /* RAW12 */
86 break;
87 default:
88 /* All MIPI CSI-2 devices must support one of primary formats */
89 mf->code = MEDIA_BUS_FMT_SBGGR8_1X8;
90 }
91 break;
92 }
93
94 if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
95 cfg->try_fmt = *mf;
96 return 0;
97 }
98
99 if (mf->width > 8188 || mf->width & 1)
100 return -EINVAL;
101
102 switch (mf->code) {
103 case MEDIA_BUS_FMT_UYVY8_2X8:
104 tmp |= 0x1e; /* YUV422 8 bit */
105 break;
106 case MEDIA_BUS_FMT_YUYV8_1_5X8:
107 tmp |= 0x18; /* YUV420 8 bit */
108 break;
109 case MEDIA_BUS_FMT_RGB555_2X8_PADHI_BE:
110 tmp |= 0x21; /* RGB555 */
111 break;
112 case MEDIA_BUS_FMT_RGB565_2X8_BE:
113 tmp |= 0x22; /* RGB565 */
114 break;
115 case MEDIA_BUS_FMT_Y8_1X8:
116 case MEDIA_BUS_FMT_SBGGR8_1X8:
117 case MEDIA_BUS_FMT_SGRBG8_1X8:
118 tmp |= 0x2a; /* RAW8 */
119 break;
120 default:
121 return -EINVAL;
122 }
123
124 iowrite32(tmp, priv->base + SH_CSI2_VCDT);
125
126 return 0;
127 }
128
sh_csi2_g_mbus_config(struct v4l2_subdev * sd,struct v4l2_mbus_config * cfg)129 static int sh_csi2_g_mbus_config(struct v4l2_subdev *sd,
130 struct v4l2_mbus_config *cfg)
131 {
132 struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev);
133
134 if (!priv->mipi_flags) {
135 struct soc_camera_device *icd = v4l2_get_subdev_hostdata(sd);
136 struct v4l2_subdev *client_sd = soc_camera_to_subdev(icd);
137 struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data;
138 unsigned long common_flags, csi2_flags;
139 struct v4l2_mbus_config client_cfg = {.type = V4L2_MBUS_CSI2,};
140 int ret;
141
142 /* Check if we can support this camera */
143 csi2_flags = V4L2_MBUS_CSI2_CONTINUOUS_CLOCK |
144 V4L2_MBUS_CSI2_1_LANE;
145
146 switch (pdata->type) {
147 case SH_CSI2C:
148 if (priv->client->lanes != 1)
149 csi2_flags |= V4L2_MBUS_CSI2_2_LANE;
150 break;
151 case SH_CSI2I:
152 switch (priv->client->lanes) {
153 default:
154 csi2_flags |= V4L2_MBUS_CSI2_4_LANE;
155 case 3:
156 csi2_flags |= V4L2_MBUS_CSI2_3_LANE;
157 case 2:
158 csi2_flags |= V4L2_MBUS_CSI2_2_LANE;
159 }
160 }
161
162 ret = v4l2_subdev_call(client_sd, video, g_mbus_config, &client_cfg);
163 if (ret == -ENOIOCTLCMD)
164 common_flags = csi2_flags;
165 else if (!ret)
166 common_flags = soc_mbus_config_compatible(&client_cfg,
167 csi2_flags);
168 else
169 common_flags = 0;
170
171 if (!common_flags)
172 return -EINVAL;
173
174 /* All good: camera MIPI configuration supported */
175 priv->mipi_flags = common_flags;
176 }
177
178 if (cfg) {
179 cfg->flags = V4L2_MBUS_PCLK_SAMPLE_RISING |
180 V4L2_MBUS_HSYNC_ACTIVE_HIGH | V4L2_MBUS_VSYNC_ACTIVE_HIGH |
181 V4L2_MBUS_MASTER | V4L2_MBUS_DATA_ACTIVE_HIGH;
182 cfg->type = V4L2_MBUS_PARALLEL;
183 }
184
185 return 0;
186 }
187
sh_csi2_s_mbus_config(struct v4l2_subdev * sd,const struct v4l2_mbus_config * cfg)188 static int sh_csi2_s_mbus_config(struct v4l2_subdev *sd,
189 const struct v4l2_mbus_config *cfg)
190 {
191 struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev);
192 struct soc_camera_device *icd = v4l2_get_subdev_hostdata(sd);
193 struct v4l2_subdev *client_sd = soc_camera_to_subdev(icd);
194 struct v4l2_mbus_config client_cfg = {.type = V4L2_MBUS_CSI2,};
195 int ret = sh_csi2_g_mbus_config(sd, NULL);
196
197 if (ret < 0)
198 return ret;
199
200 pm_runtime_get_sync(&priv->pdev->dev);
201
202 sh_csi2_hwinit(priv);
203
204 client_cfg.flags = priv->mipi_flags;
205
206 return v4l2_subdev_call(client_sd, video, s_mbus_config, &client_cfg);
207 }
208
209 static struct v4l2_subdev_video_ops sh_csi2_subdev_video_ops = {
210 .g_mbus_config = sh_csi2_g_mbus_config,
211 .s_mbus_config = sh_csi2_s_mbus_config,
212 };
213
214 static struct v4l2_subdev_pad_ops sh_csi2_subdev_pad_ops = {
215 .set_fmt = sh_csi2_set_fmt,
216 };
217
sh_csi2_hwinit(struct sh_csi2 * priv)218 static void sh_csi2_hwinit(struct sh_csi2 *priv)
219 {
220 struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data;
221 __u32 tmp = 0x10; /* Enable MIPI CSI clock lane */
222
223 /* Reflect registers immediately */
224 iowrite32(0x00000001, priv->base + SH_CSI2_TREF);
225 /* reset CSI2 harware */
226 iowrite32(0x00000001, priv->base + SH_CSI2_SRST);
227 udelay(5);
228 iowrite32(0x00000000, priv->base + SH_CSI2_SRST);
229
230 switch (pdata->type) {
231 case SH_CSI2C:
232 if (priv->client->lanes == 1)
233 tmp |= 1;
234 else
235 /* Default - both lanes */
236 tmp |= 3;
237 break;
238 case SH_CSI2I:
239 if (!priv->client->lanes || priv->client->lanes > 4)
240 /* Default - all 4 lanes */
241 tmp |= 0xf;
242 else
243 tmp |= (1 << priv->client->lanes) - 1;
244 }
245
246 if (priv->client->phy == SH_CSI2_PHY_MAIN)
247 tmp |= 0x8000;
248
249 iowrite32(tmp, priv->base + SH_CSI2_PHYCNT);
250
251 tmp = 0;
252 if (pdata->flags & SH_CSI2_ECC)
253 tmp |= 2;
254 if (pdata->flags & SH_CSI2_CRC)
255 tmp |= 1;
256 iowrite32(tmp, priv->base + SH_CSI2_CHKSUM);
257 }
258
sh_csi2_client_connect(struct sh_csi2 * priv)259 static int sh_csi2_client_connect(struct sh_csi2 *priv)
260 {
261 struct device *dev = v4l2_get_subdevdata(&priv->subdev);
262 struct sh_csi2_pdata *pdata = dev->platform_data;
263 struct soc_camera_device *icd = v4l2_get_subdev_hostdata(&priv->subdev);
264 int i;
265
266 if (priv->client)
267 return -EBUSY;
268
269 for (i = 0; i < pdata->num_clients; i++)
270 if ((pdata->clients[i].pdev &&
271 &pdata->clients[i].pdev->dev == icd->pdev) ||
272 (icd->control &&
273 strcmp(pdata->clients[i].name, dev_name(icd->control))))
274 break;
275
276 dev_dbg(dev, "%s(%p): found #%d\n", __func__, dev, i);
277
278 if (i == pdata->num_clients)
279 return -ENODEV;
280
281 priv->client = pdata->clients + i;
282
283 return 0;
284 }
285
sh_csi2_client_disconnect(struct sh_csi2 * priv)286 static void sh_csi2_client_disconnect(struct sh_csi2 *priv)
287 {
288 if (!priv->client)
289 return;
290
291 priv->client = NULL;
292
293 pm_runtime_put(v4l2_get_subdevdata(&priv->subdev));
294 }
295
sh_csi2_s_power(struct v4l2_subdev * sd,int on)296 static int sh_csi2_s_power(struct v4l2_subdev *sd, int on)
297 {
298 struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev);
299
300 if (on)
301 return sh_csi2_client_connect(priv);
302
303 sh_csi2_client_disconnect(priv);
304 return 0;
305 }
306
307 static struct v4l2_subdev_core_ops sh_csi2_subdev_core_ops = {
308 .s_power = sh_csi2_s_power,
309 };
310
311 static struct v4l2_subdev_ops sh_csi2_subdev_ops = {
312 .core = &sh_csi2_subdev_core_ops,
313 .video = &sh_csi2_subdev_video_ops,
314 .pad = &sh_csi2_subdev_pad_ops,
315 };
316
sh_csi2_probe(struct platform_device * pdev)317 static int sh_csi2_probe(struct platform_device *pdev)
318 {
319 struct resource *res;
320 unsigned int irq;
321 int ret;
322 struct sh_csi2 *priv;
323 /* Platform data specify the PHY, lanes, ECC, CRC */
324 struct sh_csi2_pdata *pdata = pdev->dev.platform_data;
325
326 if (!pdata)
327 return -EINVAL;
328
329 priv = devm_kzalloc(&pdev->dev, sizeof(struct sh_csi2), GFP_KERNEL);
330 if (!priv)
331 return -ENOMEM;
332
333 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
334 /* Interrupt unused so far */
335 irq = platform_get_irq(pdev, 0);
336
337 if (!res || (int)irq <= 0) {
338 dev_err(&pdev->dev, "Not enough CSI2 platform resources.\n");
339 return -ENODEV;
340 }
341
342 /* TODO: Add support for CSI2I. Careful: different register layout! */
343 if (pdata->type != SH_CSI2C) {
344 dev_err(&pdev->dev, "Only CSI2C supported ATM.\n");
345 return -EINVAL;
346 }
347
348 priv->irq = irq;
349
350 priv->base = devm_ioremap_resource(&pdev->dev, res);
351 if (IS_ERR(priv->base))
352 return PTR_ERR(priv->base);
353
354 priv->pdev = pdev;
355 priv->subdev.owner = THIS_MODULE;
356 priv->subdev.dev = &pdev->dev;
357 platform_set_drvdata(pdev, &priv->subdev);
358
359 v4l2_subdev_init(&priv->subdev, &sh_csi2_subdev_ops);
360 v4l2_set_subdevdata(&priv->subdev, &pdev->dev);
361
362 snprintf(priv->subdev.name, V4L2_SUBDEV_NAME_SIZE, "%s.mipi-csi",
363 dev_name(&pdev->dev));
364
365 ret = v4l2_async_register_subdev(&priv->subdev);
366 if (ret < 0)
367 return ret;
368
369 pm_runtime_enable(&pdev->dev);
370
371 dev_dbg(&pdev->dev, "CSI2 probed.\n");
372
373 return 0;
374 }
375
sh_csi2_remove(struct platform_device * pdev)376 static int sh_csi2_remove(struct platform_device *pdev)
377 {
378 struct v4l2_subdev *subdev = platform_get_drvdata(pdev);
379 struct sh_csi2 *priv = container_of(subdev, struct sh_csi2, subdev);
380
381 v4l2_async_unregister_subdev(&priv->subdev);
382 pm_runtime_disable(&pdev->dev);
383
384 return 0;
385 }
386
387 static struct platform_driver __refdata sh_csi2_pdrv = {
388 .remove = sh_csi2_remove,
389 .probe = sh_csi2_probe,
390 .driver = {
391 .name = "sh-mobile-csi2",
392 },
393 };
394
395 module_platform_driver(sh_csi2_pdrv);
396
397 MODULE_DESCRIPTION("SH-Mobile MIPI CSI-2 driver");
398 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
399 MODULE_LICENSE("GPL v2");
400 MODULE_ALIAS("platform:sh-mobile-csi2");
401