2 * Driver for the SH-Mobile MIPI CSI-2 unit
4 * Copyright (C) 2010, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
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.
11 #include <linux/delay.h>
12 #include <linux/i2c.h>
14 #include <linux/platform_device.h>
15 #include <linux/pm_runtime.h>
16 #include <linux/slab.h>
17 #include <linux/videodev2.h>
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>
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
36 struct v4l2_subdev subdev;
37 struct list_head list;
39 unsigned long mipi_flags;
41 struct platform_device *pdev;
42 struct sh_csi2_client_config *client;
45 static int sh_csi2_try_fmt(struct v4l2_subdev *sd,
46 struct v4l2_mbus_framefmt *mf)
48 struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev);
49 struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data;
53 else if (mf->width & 1)
56 switch (pdata->type) {
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:
66 /* All MIPI CSI-2 devices must support one of primary formats */
67 mf->code = V4L2_MBUS_FMT_YUYV8_2X8;
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 */
79 /* All MIPI CSI-2 devices must support one of primary formats */
80 mf->code = V4L2_MBUS_FMT_SBGGR8_1X8;
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
93 static int sh_csi2_s_fmt(struct v4l2_subdev *sd,
94 struct v4l2_mbus_framefmt *mf)
96 struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev);
97 u32 tmp = (priv->client->channel & 3) << 8;
99 dev_dbg(sd->v4l2_dev->dev, "%s(%u)\n", __func__, mf->code);
100 if (mf->width > 8188 || mf->width & 1)
104 case V4L2_MBUS_FMT_UYVY8_2X8:
105 tmp |= 0x1e; /* YUV422 8 bit */
107 case V4L2_MBUS_FMT_YUYV8_1_5X8:
108 tmp |= 0x18; /* YUV420 8 bit */
110 case V4L2_MBUS_FMT_RGB555_2X8_PADHI_BE:
111 tmp |= 0x21; /* RGB555 */
113 case V4L2_MBUS_FMT_RGB565_2X8_BE:
114 tmp |= 0x22; /* RGB565 */
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 */
125 iowrite32(tmp, priv->base + SH_CSI2_VCDT);
130 static int sh_csi2_g_mbus_config(struct v4l2_subdev *sd,
131 struct v4l2_mbus_config *cfg)
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;
141 static int sh_csi2_s_mbus_config(struct v4l2_subdev *sd,
142 const struct v4l2_mbus_config *cfg)
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};
150 return v4l2_subdev_call(client_sd, video, s_mbus_config, &client_cfg);
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,
160 static void sh_csi2_hwinit(struct sh_csi2 *priv)
162 struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data;
163 __u32 tmp = 0x10; /* Enable MIPI CSI clock lane */
165 /* Reflect registers immediately */
166 iowrite32(0x00000001, priv->base + SH_CSI2_TREF);
167 /* reset CSI2 harware */
168 iowrite32(0x00000001, priv->base + SH_CSI2_SRST);
170 iowrite32(0x00000000, priv->base + SH_CSI2_SRST);
172 switch (pdata->type) {
174 if (priv->client->lanes == 1)
177 /* Default - both lanes */
181 if (!priv->client->lanes || priv->client->lanes > 4)
182 /* Default - all 4 lanes */
185 tmp |= (1 << priv->client->lanes) - 1;
188 if (priv->client->phy == SH_CSI2_PHY_MAIN)
191 iowrite32(tmp, priv->base + SH_CSI2_PHYCNT);
194 if (pdata->flags & SH_CSI2_ECC)
196 if (pdata->flags & SH_CSI2_CRC)
198 iowrite32(tmp, priv->base + SH_CSI2_CHKSUM);
201 static int sh_csi2_client_connect(struct sh_csi2 *priv)
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;
214 for (i = 0; i < pdata->num_clients; i++)
215 if (&pdata->clients[i].pdev->dev == icd->pdev)
218 dev_dbg(dev, "%s(%p): found #%d\n", __func__, dev, i);
220 if (i == pdata->num_clients)
223 /* Check if we can support this camera */
224 csi2_flags = V4L2_MBUS_CSI2_CONTINUOUS_CLOCK | V4L2_MBUS_CSI2_1_LANE;
226 switch (pdata->type) {
228 if (pdata->clients[i].lanes != 1)
229 csi2_flags |= V4L2_MBUS_CSI2_2_LANE;
232 switch (pdata->clients[i].lanes) {
234 csi2_flags |= V4L2_MBUS_CSI2_4_LANE;
236 csi2_flags |= V4L2_MBUS_CSI2_3_LANE;
238 csi2_flags |= V4L2_MBUS_CSI2_2_LANE;
242 cfg.type = V4L2_MBUS_CSI2;
243 ret = v4l2_subdev_call(client_sd, video, g_mbus_config, &cfg);
244 if (ret == -ENOIOCTLCMD)
245 common_flags = csi2_flags;
247 common_flags = soc_mbus_config_compatible(&cfg,
255 /* All good: camera MIPI configuration supported */
256 priv->mipi_flags = common_flags;
257 priv->client = pdata->clients + i;
259 pm_runtime_get_sync(dev);
261 sh_csi2_hwinit(priv);
266 static void sh_csi2_client_disconnect(struct sh_csi2 *priv)
273 pm_runtime_put(v4l2_get_subdevdata(&priv->subdev));
276 static int sh_csi2_s_power(struct v4l2_subdev *sd, int on)
278 struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev);
281 return sh_csi2_client_connect(priv);
283 sh_csi2_client_disconnect(priv);
287 static struct v4l2_subdev_core_ops sh_csi2_subdev_core_ops = {
288 .s_power = sh_csi2_s_power,
291 static struct v4l2_subdev_ops sh_csi2_subdev_ops = {
292 .core = &sh_csi2_subdev_core_ops,
293 .video = &sh_csi2_subdev_video_ops,
296 static __devinit int sh_csi2_probe(struct platform_device *pdev)
298 struct resource *res;
301 struct sh_csi2 *priv;
302 /* Platform data specify the PHY, lanes, ECC, CRC */
303 struct sh_csi2_pdata *pdata = pdev->dev.platform_data;
305 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
306 /* Interrupt unused so far */
307 irq = platform_get_irq(pdev, 0);
309 if (!res || (int)irq <= 0 || !pdata) {
310 dev_err(&pdev->dev, "Not enough CSI2 platform resources.\n");
314 /* TODO: Add support for CSI2I. Careful: different register layout! */
315 if (pdata->type != SH_CSI2C) {
316 dev_err(&pdev->dev, "Only CSI2C supported ATM.\n");
320 priv = kzalloc(sizeof(struct sh_csi2), GFP_KERNEL);
326 if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
327 dev_err(&pdev->dev, "CSI2 register region already claimed\n");
332 priv->base = ioremap(res->start, resource_size(res));
335 dev_err(&pdev->dev, "Unable to ioremap CSI2 registers.\n");
340 platform_set_drvdata(pdev, priv);
342 v4l2_subdev_init(&priv->subdev, &sh_csi2_subdev_ops);
343 v4l2_set_subdevdata(&priv->subdev, &pdev->dev);
345 snprintf(priv->subdev.name, V4L2_SUBDEV_NAME_SIZE, "%s.mipi-csi",
346 dev_name(pdata->v4l2_dev->dev));
347 ret = v4l2_device_register_subdev(pdata->v4l2_dev, &priv->subdev);
348 dev_dbg(&pdev->dev, "%s(%p): ret(register_subdev) = %d\n", __func__, priv, ret);
352 pm_runtime_enable(&pdev->dev);
354 dev_dbg(&pdev->dev, "CSI2 probed.\n");
361 release_mem_region(res->start, resource_size(res));
368 static __devexit int sh_csi2_remove(struct platform_device *pdev)
370 struct sh_csi2 *priv = platform_get_drvdata(pdev);
371 struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
373 v4l2_device_unregister_subdev(&priv->subdev);
374 pm_runtime_disable(&pdev->dev);
376 release_mem_region(res->start, resource_size(res));
377 platform_set_drvdata(pdev, NULL);
383 static struct platform_driver __refdata sh_csi2_pdrv = {
384 .remove = __devexit_p(sh_csi2_remove),
385 .probe = sh_csi2_probe,
387 .name = "sh-mobile-csi2",
388 .owner = THIS_MODULE,
392 static int __init sh_csi2_init(void)
394 return platform_driver_register(&sh_csi2_pdrv);
397 static void __exit sh_csi2_exit(void)
399 platform_driver_unregister(&sh_csi2_pdrv);
402 module_init(sh_csi2_init);
403 module_exit(sh_csi2_exit);
405 MODULE_DESCRIPTION("SH-Mobile MIPI CSI-2 driver");
406 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
407 MODULE_LICENSE("GPL v2");
408 MODULE_ALIAS("platform:sh-mobile-csi2");