[media] marvell-cam: Basic working MMP camera driver
[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
19 #include <media/sh_mobile_csi2.h>
20 #include <media/soc_camera.h>
21 #include <media/v4l2-common.h>
22 #include <media/v4l2-dev.h>
23 #include <media/v4l2-device.h>
24 #include <media/v4l2-mediabus.h>
25 #include <media/v4l2-subdev.h>
26
27 #define SH_CSI2_TREF    0x00
28 #define SH_CSI2_SRST    0x04
29 #define SH_CSI2_PHYCNT  0x08
30 #define SH_CSI2_CHKSUM  0x0C
31 #define SH_CSI2_VCDT    0x10
32
33 struct sh_csi2 {
34         struct v4l2_subdev              subdev;
35         struct list_head                list;
36         struct notifier_block           notifier;
37         unsigned int                    irq;
38         void __iomem                    *base;
39         struct platform_device          *pdev;
40         struct sh_csi2_client_config    *client;
41         unsigned long (*query_bus_param)(struct soc_camera_device *);
42         int (*set_bus_param)(struct soc_camera_device *, unsigned long);
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 struct v4l2_subdev_video_ops sh_csi2_subdev_video_ops = {
131         .s_mbus_fmt     = sh_csi2_s_fmt,
132         .try_mbus_fmt   = sh_csi2_try_fmt,
133 };
134
135 static struct v4l2_subdev_core_ops sh_csi2_subdev_core_ops;
136
137 static struct v4l2_subdev_ops sh_csi2_subdev_ops = {
138         .core   = &sh_csi2_subdev_core_ops,
139         .video  = &sh_csi2_subdev_video_ops,
140 };
141
142 static void sh_csi2_hwinit(struct sh_csi2 *priv)
143 {
144         struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data;
145         __u32 tmp = 0x10; /* Enable MIPI CSI clock lane */
146
147         /* Reflect registers immediately */
148         iowrite32(0x00000001, priv->base + SH_CSI2_TREF);
149         /* reset CSI2 harware */
150         iowrite32(0x00000001, priv->base + SH_CSI2_SRST);
151         udelay(5);
152         iowrite32(0x00000000, priv->base + SH_CSI2_SRST);
153
154         if (priv->client->lanes & 3)
155                 tmp |= priv->client->lanes & 3;
156         else
157                 /* Default - both lanes */
158                 tmp |= 3;
159
160         if (priv->client->phy == SH_CSI2_PHY_MAIN)
161                 tmp |= 0x8000;
162
163         iowrite32(tmp, priv->base + SH_CSI2_PHYCNT);
164
165         tmp = 0;
166         if (pdata->flags & SH_CSI2_ECC)
167                 tmp |= 2;
168         if (pdata->flags & SH_CSI2_CRC)
169                 tmp |= 1;
170         iowrite32(tmp, priv->base + SH_CSI2_CHKSUM);
171 }
172
173 static int sh_csi2_set_bus_param(struct soc_camera_device *icd,
174                                  unsigned long flags)
175 {
176         return 0;
177 }
178
179 static unsigned long sh_csi2_query_bus_param(struct soc_camera_device *icd)
180 {
181         struct soc_camera_link *icl = to_soc_camera_link(icd);
182         const unsigned long flags = SOCAM_PCLK_SAMPLE_RISING |
183                 SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_HIGH |
184                 SOCAM_MASTER | SOCAM_DATAWIDTH_8 | SOCAM_DATA_ACTIVE_HIGH;
185
186         return soc_camera_apply_sensor_flags(icl, flags);
187 }
188
189 static int sh_csi2_notify(struct notifier_block *nb,
190                           unsigned long action, void *data)
191 {
192         struct device *dev = data;
193         struct soc_camera_device *icd = to_soc_camera_dev(dev);
194         struct v4l2_device *v4l2_dev = dev_get_drvdata(dev->parent);
195         struct sh_csi2 *priv =
196                 container_of(nb, struct sh_csi2, notifier);
197         struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data;
198         int ret, i;
199
200         for (i = 0; i < pdata->num_clients; i++)
201                 if (&pdata->clients[i].pdev->dev == icd->pdev)
202                         break;
203
204         dev_dbg(dev, "%s(%p): action = %lu, found #%d\n", __func__, dev, action, i);
205
206         if (i == pdata->num_clients)
207                 return NOTIFY_DONE;
208
209         switch (action) {
210         case BUS_NOTIFY_BOUND_DRIVER:
211                 snprintf(priv->subdev.name, V4L2_SUBDEV_NAME_SIZE, "%s%s",
212                          dev_name(v4l2_dev->dev), ".mipi-csi");
213                 priv->subdev.grp_id = (long)icd;
214                 ret = v4l2_device_register_subdev(v4l2_dev, &priv->subdev);
215                 dev_dbg(dev, "%s(%p): ret(register_subdev) = %d\n", __func__, priv, ret);
216                 if (ret < 0)
217                         return NOTIFY_DONE;
218
219                 priv->client = pdata->clients + i;
220
221                 priv->set_bus_param             = icd->ops->set_bus_param;
222                 priv->query_bus_param           = icd->ops->query_bus_param;
223                 icd->ops->set_bus_param         = sh_csi2_set_bus_param;
224                 icd->ops->query_bus_param       = sh_csi2_query_bus_param;
225
226                 pm_runtime_get_sync(v4l2_get_subdevdata(&priv->subdev));
227
228                 sh_csi2_hwinit(priv);
229                 break;
230         case BUS_NOTIFY_UNBIND_DRIVER:
231                 priv->client = NULL;
232
233                 /* Driver is about to be unbound */
234                 icd->ops->set_bus_param         = priv->set_bus_param;
235                 icd->ops->query_bus_param       = priv->query_bus_param;
236                 priv->set_bus_param             = NULL;
237                 priv->query_bus_param           = NULL;
238
239                 v4l2_device_unregister_subdev(&priv->subdev);
240
241                 pm_runtime_put(v4l2_get_subdevdata(&priv->subdev));
242                 break;
243         }
244
245         return NOTIFY_OK;
246 }
247
248 static __devinit int sh_csi2_probe(struct platform_device *pdev)
249 {
250         struct resource *res;
251         unsigned int irq;
252         int ret;
253         struct sh_csi2 *priv;
254         /* Platform data specify the PHY, lanes, ECC, CRC */
255         struct sh_csi2_pdata *pdata = pdev->dev.platform_data;
256
257         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
258         /* Interrupt unused so far */
259         irq = platform_get_irq(pdev, 0);
260
261         if (!res || (int)irq <= 0 || !pdata) {
262                 dev_err(&pdev->dev, "Not enough CSI2 platform resources.\n");
263                 return -ENODEV;
264         }
265
266         /* TODO: Add support for CSI2I. Careful: different register layout! */
267         if (pdata->type != SH_CSI2C) {
268                 dev_err(&pdev->dev, "Only CSI2C supported ATM.\n");
269                 return -EINVAL;
270         }
271
272         priv = kzalloc(sizeof(struct sh_csi2), GFP_KERNEL);
273         if (!priv)
274                 return -ENOMEM;
275
276         priv->irq = irq;
277         priv->notifier.notifier_call = sh_csi2_notify;
278
279         /* We MUST attach after the MIPI sensor */
280         ret = bus_register_notifier(&soc_camera_bus_type, &priv->notifier);
281         if (ret < 0) {
282                 dev_err(&pdev->dev, "CSI2 cannot register notifier\n");
283                 goto ernotify;
284         }
285
286         if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
287                 dev_err(&pdev->dev, "CSI2 register region already claimed\n");
288                 ret = -EBUSY;
289                 goto ereqreg;
290         }
291
292         priv->base = ioremap(res->start, resource_size(res));
293         if (!priv->base) {
294                 ret = -ENXIO;
295                 dev_err(&pdev->dev, "Unable to ioremap CSI2 registers.\n");
296                 goto eremap;
297         }
298
299         priv->pdev = pdev;
300
301         v4l2_subdev_init(&priv->subdev, &sh_csi2_subdev_ops);
302         v4l2_set_subdevdata(&priv->subdev, &pdev->dev);
303
304         platform_set_drvdata(pdev, priv);
305
306         pm_runtime_enable(&pdev->dev);
307
308         dev_dbg(&pdev->dev, "CSI2 probed.\n");
309
310         return 0;
311
312 eremap:
313         release_mem_region(res->start, resource_size(res));
314 ereqreg:
315         bus_unregister_notifier(&soc_camera_bus_type, &priv->notifier);
316 ernotify:
317         kfree(priv);
318
319         return ret;
320 }
321
322 static __devexit int sh_csi2_remove(struct platform_device *pdev)
323 {
324         struct sh_csi2 *priv = platform_get_drvdata(pdev);
325         struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
326
327         bus_unregister_notifier(&soc_camera_bus_type, &priv->notifier);
328         pm_runtime_disable(&pdev->dev);
329         iounmap(priv->base);
330         release_mem_region(res->start, resource_size(res));
331         platform_set_drvdata(pdev, NULL);
332         kfree(priv);
333
334         return 0;
335 }
336
337 static struct platform_driver __refdata sh_csi2_pdrv = {
338         .remove  = __devexit_p(sh_csi2_remove),
339         .driver  = {
340                 .name   = "sh-mobile-csi2",
341                 .owner  = THIS_MODULE,
342         },
343 };
344
345 static int __init sh_csi2_init(void)
346 {
347         return platform_driver_probe(&sh_csi2_pdrv, sh_csi2_probe);
348 }
349
350 static void __exit sh_csi2_exit(void)
351 {
352         platform_driver_unregister(&sh_csi2_pdrv);
353 }
354
355 module_init(sh_csi2_init);
356 module_exit(sh_csi2_exit);
357
358 MODULE_DESCRIPTION("SH-Mobile MIPI CSI-2 driver");
359 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
360 MODULE_LICENSE("GPL v2");
361 MODULE_ALIAS("platform:sh-mobile-csi2");