?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
e1000e: cleanup whitespace and indentation
[linux-2.6.git] / drivers / media / video / atmel-isi.c
blobec3f6a06f9c3baf5f92e09abbb4e2bcef54196bd
1 /*
2 * Copyright (c) 2011 Atmel Corporation
3 * Josh Wu, <josh.wu@atmel.com>
4 *
5 * Based on previous work by Lars Haring, <lars.haring@atmel.com>
6 * and Sedji Gaouaou
7 * Based on the bttv driver for Bt848 with respective copyright holders
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14 #include <linux/clk.h>
15 #include <linux/completion.h>
16 #include <linux/delay.h>
17 #include <linux/fs.h>
18 #include <linux/init.h>
19 #include <linux/interrupt.h>
20 #include <linux/kernel.h>
21 #include <linux/module.h>
22 #include <linux/platform_device.h>
23 #include <linux/slab.h>
24
25 #include <media/atmel-isi.h>
26 #include <media/soc_camera.h>
27 #include <media/soc_mediabus.h>
28 #include <media/videobuf2-dma-contig.h>
29
30 #define MAX_BUFFER_NUM 32
31 #define MAX_SUPPORT_WIDTH 2048
32 #define MAX_SUPPORT_HEIGHT 2048
33 #define VID_LIMIT_BYTES (16 * 1024 * 1024)
34 #define MIN_FRAME_RATE 15
35 #define FRAME_INTERVAL_MILLI_SEC (1000 / MIN_FRAME_RATE)
36
37 /* ISI states */
38 enum {
39 ISI_STATE_IDLE = 0,
40 ISI_STATE_READY,
41 ISI_STATE_WAIT_SOF,
42 };
43
44 /* Frame buffer descriptor */
45 struct fbd {
46 /* Physical address of the frame buffer */
47 u32 fb_address;
48 /* DMA Control Register(only in HISI2) */
49 u32 dma_ctrl;
50 /* Physical address of the next fbd */
51 u32 next_fbd_address;
52 };
53
54 static void set_dma_ctrl(struct fbd *fb_desc, u32 ctrl)
55 {
56 fb_desc->dma_ctrl = ctrl;
57 }
58
59 struct isi_dma_desc {
60 struct list_head list;
61 struct fbd *p_fbd;
62 u32 fbd_phys;
63 };
64
65 /* Frame buffer data */
66 struct frame_buffer {
67 struct vb2_buffer vb;
68 struct isi_dma_desc *p_dma_desc;
69 struct list_head list;
70 };
71
72 struct atmel_isi {
73 /* Protects the access of variables shared with the ISR */
74 spinlock_t lock;
75 void __iomem *regs;
76
77 int sequence;
78 /* State of the ISI module in capturing mode */
79 int state;
80
81 /* Wait queue for waiting for SOF */
82 wait_queue_head_t vsync_wq;
83
84 struct vb2_alloc_ctx *alloc_ctx;
85
86 /* Allocate descriptors for dma buffer use */
87 struct fbd *p_fb_descriptors;
88 u32 fb_descriptors_phys;
89 struct list_head dma_desc_head;
90 struct isi_dma_desc dma_desc[MAX_BUFFER_NUM];
91
92 struct completion complete;
93 /* ISI peripherial clock */
94 struct clk *pclk;
95 /* ISI_MCK, feed to camera sensor to generate pixel clock */
96 struct clk *mck;
97 unsigned int irq;
98
99 struct isi_platform_data *pdata;
100 u16 width_flags; /* max 12 bits */
101
102 struct list_head video_buffer_list;
103 struct frame_buffer *active;
104
105 struct soc_camera_device *icd;
106 struct soc_camera_host soc_host;
107 };
108
109 static void isi_writel(struct atmel_isi *isi, u32 reg, u32 val)
110 {
111 writel(val, isi->regs + reg);
112 }
113 static u32 isi_readl(struct atmel_isi *isi, u32 reg)
114 {
115 return readl(isi->regs + reg);
116 }
117
118 static int configure_geometry(struct atmel_isi *isi, u32 width,
119 u32 height, enum v4l2_mbus_pixelcode code)
120 {
121 u32 cfg2, cr;
122
123 switch (code) {
124 /* YUV, including grey */
125 case V4L2_MBUS_FMT_Y8_1X8:
126 cr = ISI_CFG2_GRAYSCALE;
127 break;
128 case V4L2_MBUS_FMT_UYVY8_2X8:
129 cr = ISI_CFG2_YCC_SWAP_MODE_3;
130 break;
131 case V4L2_MBUS_FMT_VYUY8_2X8:
132 cr = ISI_CFG2_YCC_SWAP_MODE_2;
133 break;
134 case V4L2_MBUS_FMT_YUYV8_2X8:
135 cr = ISI_CFG2_YCC_SWAP_MODE_1;
136 break;
137 case V4L2_MBUS_FMT_YVYU8_2X8:
138 cr = ISI_CFG2_YCC_SWAP_DEFAULT;
139 break;
140 /* RGB, TODO */
141 default:
142 return -EINVAL;
143 }
144
145 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
146
147 cfg2 = isi_readl(isi, ISI_CFG2);
148 cfg2 |= cr;
149 /* Set width */
150 cfg2 &= ~(ISI_CFG2_IM_HSIZE_MASK);
151 cfg2 |= ((width - 1) << ISI_CFG2_IM_HSIZE_OFFSET) &
152 ISI_CFG2_IM_HSIZE_MASK;
153 /* Set height */
154 cfg2 &= ~(ISI_CFG2_IM_VSIZE_MASK);
155 cfg2 |= ((height - 1) << ISI_CFG2_IM_VSIZE_OFFSET)
156 & ISI_CFG2_IM_VSIZE_MASK;
157 isi_writel(isi, ISI_CFG2, cfg2);
158
159 return 0;
160 }
161
162 static irqreturn_t atmel_isi_handle_streaming(struct atmel_isi *isi)
163 {
164 if (isi->active) {
165 struct vb2_buffer *vb = &isi->active->vb;
166 struct frame_buffer *buf = isi->active;
167
168 list_del_init(&buf->list);
169 do_gettimeofday(&vb->v4l2_buf.timestamp);
170 vb->v4l2_buf.sequence = isi->sequence++;
171 vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
172 }
173
174 if (list_empty(&isi->video_buffer_list)) {
175 isi->active = NULL;
176 } else {
177 /* start next dma frame. */
178 isi->active = list_entry(isi->video_buffer_list.next,
179 struct frame_buffer, list);
180 isi_writel(isi, ISI_DMA_C_DSCR,
181 isi->active->p_dma_desc->fbd_phys);
182 isi_writel(isi, ISI_DMA_C_CTRL,
183 ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
184 isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_C_CH);
185 }
186 return IRQ_HANDLED;
187 }
188
189 /* ISI interrupt service routine */
190 static irqreturn_t isi_interrupt(int irq, void *dev_id)
191 {
192 struct atmel_isi *isi = dev_id;
193 u32 status, mask, pending;
194 irqreturn_t ret = IRQ_NONE;
195
196 spin_lock(&isi->lock);
197
198 status = isi_readl(isi, ISI_STATUS);
199 mask = isi_readl(isi, ISI_INTMASK);
200 pending = status & mask;
201
202 if (pending & ISI_CTRL_SRST) {
203 complete(&isi->complete);
204 isi_writel(isi, ISI_INTDIS, ISI_CTRL_SRST);
205 ret = IRQ_HANDLED;
206 } else if (pending & ISI_CTRL_DIS) {
207 complete(&isi->complete);
208 isi_writel(isi, ISI_INTDIS, ISI_CTRL_DIS);
209 ret = IRQ_HANDLED;
210 } else {
211 if ((pending & ISI_SR_VSYNC) &&
212 (isi->state == ISI_STATE_IDLE)) {
213 isi->state = ISI_STATE_READY;
214 wake_up_interruptible(&isi->vsync_wq);
215 ret = IRQ_HANDLED;
216 }
217 if (likely(pending & ISI_SR_CXFR_DONE))
218 ret = atmel_isi_handle_streaming(isi);
219 }
220
221 spin_unlock(&isi->lock);
222 return ret;
223 }
224
225 #define WAIT_ISI_RESET 1
226 #define WAIT_ISI_DISABLE 0
227 static int atmel_isi_wait_status(struct atmel_isi *isi, int wait_reset)
228 {
229 unsigned long timeout;
230 /*
231 * The reset or disable will only succeed if we have a
232 * pixel clock from the camera.
233 */
234 init_completion(&isi->complete);
235
236 if (wait_reset) {
237 isi_writel(isi, ISI_INTEN, ISI_CTRL_SRST);
238 isi_writel(isi, ISI_CTRL, ISI_CTRL_SRST);
239 } else {
240 isi_writel(isi, ISI_INTEN, ISI_CTRL_DIS);
241 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
242 }
243
244 timeout = wait_for_completion_timeout(&isi->complete,
245 msecs_to_jiffies(100));
246 if (timeout == 0)
247 return -ETIMEDOUT;
248
249 return 0;
250 }
251
252 /* ------------------------------------------------------------------
253 Videobuf operations
254 ------------------------------------------------------------------*/
255 static int queue_setup(struct vb2_queue *vq, const struct v4l2_format *fmt,
256 unsigned int *nbuffers, unsigned int *nplanes,
257 unsigned int sizes[], void *alloc_ctxs[])
258 {
259 struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
260 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
261 struct atmel_isi *isi = ici->priv;
262 unsigned long size;
263 int ret, bytes_per_line;
264
265 /* Reset ISI */
266 ret = atmel_isi_wait_status(isi, WAIT_ISI_RESET);
267 if (ret < 0) {
268 dev_err(icd->parent, "Reset ISI timed out\n");
269 return ret;
270 }
271 /* Disable all interrupts */
272 isi_writel(isi, ISI_INTDIS, ~0UL);
273
274 bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
275 icd->current_fmt->host_fmt);
276
277 if (bytes_per_line < 0)
278 return bytes_per_line;
279
280 size = bytes_per_line * icd->user_height;
281
282 if (!*nbuffers || *nbuffers > MAX_BUFFER_NUM)
283 *nbuffers = MAX_BUFFER_NUM;
284
285 if (size * *nbuffers > VID_LIMIT_BYTES)
286 *nbuffers = VID_LIMIT_BYTES / size;
287
288 *nplanes = 1;
289 sizes[0] = size;
290 alloc_ctxs[0] = isi->alloc_ctx;
291
292 isi->sequence = 0;
293 isi->active = NULL;
294
295 dev_dbg(icd->parent, "%s, count=%d, size=%ld\n", __func__,
296 *nbuffers, size);
297
298 return 0;
299 }
300
301 static int buffer_init(struct vb2_buffer *vb)
302 {
303 struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
304
305 buf->p_dma_desc = NULL;
306 INIT_LIST_HEAD(&buf->list);
307
308 return 0;
309 }
310
311 static int buffer_prepare(struct vb2_buffer *vb)
312 {
313 struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
314 struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
315 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
316 struct atmel_isi *isi = ici->priv;
317 unsigned long size;
318 struct isi_dma_desc *desc;
319 int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
320 icd->current_fmt->host_fmt);
321
322 if (bytes_per_line < 0)
323 return bytes_per_line;
324
325 size = bytes_per_line * icd->user_height;
326
327 if (vb2_plane_size(vb, 0) < size) {
328 dev_err(icd->parent, "%s data will not fit into plane (%lu < %lu)\n",
329 __func__, vb2_plane_size(vb, 0), size);
330 return -EINVAL;
331 }
332
333 vb2_set_plane_payload(&buf->vb, 0, size);
334
335 if (!buf->p_dma_desc) {
336 if (list_empty(&isi->dma_desc_head)) {
337 dev_err(icd->parent, "Not enough dma descriptors.\n");
338 return -EINVAL;
339 } else {
340 /* Get an available descriptor */
341 desc = list_entry(isi->dma_desc_head.next,
342 struct isi_dma_desc, list);
343 /* Delete the descriptor since now it is used */
344 list_del_init(&desc->list);
345
346 /* Initialize the dma descriptor */
347 desc->p_fbd->fb_address =
348 vb2_dma_contig_plane_dma_addr(vb, 0);
349 desc->p_fbd->next_fbd_address = 0;
350 set_dma_ctrl(desc->p_fbd, ISI_DMA_CTRL_WB);
351
352 buf->p_dma_desc = desc;
353 }
354 }
355 return 0;
356 }
357
358 static void buffer_cleanup(struct vb2_buffer *vb)
359 {
360 struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
361 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
362 struct atmel_isi *isi = ici->priv;
363 struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
364
365 /* This descriptor is available now and we add to head list */
366 if (buf->p_dma_desc)
367 list_add(&buf->p_dma_desc->list, &isi->dma_desc_head);
368 }
369
370 static void start_dma(struct atmel_isi *isi, struct frame_buffer *buffer)
371 {
372 u32 ctrl, cfg1;
373
374 cfg1 = isi_readl(isi, ISI_CFG1);
375 /* Enable irq: cxfr for the codec path, pxfr for the preview path */
376 isi_writel(isi, ISI_INTEN,
377 ISI_SR_CXFR_DONE | ISI_SR_PXFR_DONE);
378
379 /* Check if already in a frame */
380 if (isi_readl(isi, ISI_STATUS) & ISI_CTRL_CDC) {
381 dev_err(isi->icd->parent, "Already in frame handling.\n");
382 return;
383 }
384
385 isi_writel(isi, ISI_DMA_C_DSCR, buffer->p_dma_desc->fbd_phys);
386 isi_writel(isi, ISI_DMA_C_CTRL, ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
387 isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_C_CH);
388
389 /* Enable linked list */
390 cfg1 |= isi->pdata->frate | ISI_CFG1_DISCR;
391
392 /* Enable codec path and ISI */
393 ctrl = ISI_CTRL_CDC | ISI_CTRL_EN;
394 isi_writel(isi, ISI_CTRL, ctrl);
395 isi_writel(isi, ISI_CFG1, cfg1);
396 }
397
398 static void buffer_queue(struct vb2_buffer *vb)
399 {
400 struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
401 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
402 struct atmel_isi *isi = ici->priv;
403 struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
404 unsigned long flags = 0;
405
406 spin_lock_irqsave(&isi->lock, flags);
407 list_add_tail(&buf->list, &isi->video_buffer_list);
408
409 if (isi->active == NULL) {
410 isi->active = buf;
411 if (vb2_is_streaming(vb->vb2_queue))
412 start_dma(isi, buf);
413 }
414 spin_unlock_irqrestore(&isi->lock, flags);
415 }
416
417 static int start_streaming(struct vb2_queue *vq, unsigned int count)
418 {
419 struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
420 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
421 struct atmel_isi *isi = ici->priv;
422
423 u32 sr = 0;
424 int ret;
425
426 spin_lock_irq(&isi->lock);
427 isi->state = ISI_STATE_IDLE;
428 /* Clear any pending SOF interrupt */
429 sr = isi_readl(isi, ISI_STATUS);
430 /* Enable VSYNC interrupt for SOF */
431 isi_writel(isi, ISI_INTEN, ISI_SR_VSYNC);
432 isi_writel(isi, ISI_CTRL, ISI_CTRL_EN);
433 spin_unlock_irq(&isi->lock);
434
435 dev_dbg(icd->parent, "Waiting for SOF\n");
436 ret = wait_event_interruptible(isi->vsync_wq,
437 isi->state != ISI_STATE_IDLE);
438 if (ret)
439 goto err;
440
441 if (isi->state != ISI_STATE_READY) {
442 ret = -EIO;
443 goto err;
444 }
445
446 spin_lock_irq(&isi->lock);
447 isi->state = ISI_STATE_WAIT_SOF;
448 isi_writel(isi, ISI_INTDIS, ISI_SR_VSYNC);
449 if (count)
450 start_dma(isi, isi->active);
451 spin_unlock_irq(&isi->lock);
452
453 return 0;
454 err:
455 isi->active = NULL;
456 isi->sequence = 0;
457 INIT_LIST_HEAD(&isi->video_buffer_list);
458 return ret;
459 }
460
461 /* abort streaming and wait for last buffer */
462 static int stop_streaming(struct vb2_queue *vq)
463 {
464 struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
465 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
466 struct atmel_isi *isi = ici->priv;
467 struct frame_buffer *buf, *node;
468 int ret = 0;
469 unsigned long timeout;
470
471 spin_lock_irq(&isi->lock);
472 isi->active = NULL;
473 /* Release all active buffers */
474 list_for_each_entry_safe(buf, node, &isi->video_buffer_list, list) {
475 list_del_init(&buf->list);
476 vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
477 }
478 spin_unlock_irq(&isi->lock);
479
480 timeout = jiffies + FRAME_INTERVAL_MILLI_SEC * HZ;
481 /* Wait until the end of the current frame. */
482 while ((isi_readl(isi, ISI_STATUS) & ISI_CTRL_CDC) &&
483 time_before(jiffies, timeout))
484 msleep(1);
485
486 if (time_after(jiffies, timeout)) {
487 dev_err(icd->parent,
488 "Timeout waiting for finishing codec request\n");
489 return -ETIMEDOUT;
490 }
491
492 /* Disable interrupts */
493 isi_writel(isi, ISI_INTDIS,
494 ISI_SR_CXFR_DONE | ISI_SR_PXFR_DONE);
495
496 /* Disable ISI and wait for it is done */
497 ret = atmel_isi_wait_status(isi, WAIT_ISI_DISABLE);
498 if (ret < 0)
499 dev_err(icd->parent, "Disable ISI timed out\n");
500
501 return ret;
502 }
503
504 static struct vb2_ops isi_video_qops = {
505 .queue_setup = queue_setup,
506 .buf_init = buffer_init,
507 .buf_prepare = buffer_prepare,
508 .buf_cleanup = buffer_cleanup,
509 .buf_queue = buffer_queue,
510 .start_streaming = start_streaming,
511 .stop_streaming = stop_streaming,
512 .wait_prepare = soc_camera_unlock,
513 .wait_finish = soc_camera_lock,
514 };
515
516 /* ------------------------------------------------------------------
517 SOC camera operations for the device
518 ------------------------------------------------------------------*/
519 static int isi_camera_init_videobuf(struct vb2_queue *q,
520 struct soc_camera_device *icd)
521 {
522 q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
523 q->io_modes = VB2_MMAP;
524 q->drv_priv = icd;
525 q->buf_struct_size = sizeof(struct frame_buffer);
526 q->ops = &isi_video_qops;
527 q->mem_ops = &vb2_dma_contig_memops;
528
529 return vb2_queue_init(q);
530 }
531
532 static int isi_camera_set_fmt(struct soc_camera_device *icd,
533 struct v4l2_format *f)
534 {
535 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
536 struct atmel_isi *isi = ici->priv;
537 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
538 const struct soc_camera_format_xlate *xlate;
539 struct v4l2_pix_format *pix = &f->fmt.pix;
540 struct v4l2_mbus_framefmt mf;
541 int ret;
542
543 xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
544 if (!xlate) {
545 dev_warn(icd->parent, "Format %x not found\n",
546 pix->pixelformat);
547 return -EINVAL;
548 }
549
550 dev_dbg(icd->parent, "Plan to set format %dx%d\n",
551 pix->width, pix->height);
552
553 mf.width = pix->width;
554 mf.height = pix->height;
555 mf.field = pix->field;
556 mf.colorspace = pix->colorspace;
557 mf.code = xlate->code;
558
559 ret = v4l2_subdev_call(sd, video, s_mbus_fmt, &mf);
560 if (ret < 0)
561 return ret;
562
563 if (mf.code != xlate->code)
564 return -EINVAL;
565
566 ret = configure_geometry(isi, pix->width, pix->height, xlate->code);
567 if (ret < 0)
568 return ret;
569
570 pix->width = mf.width;
571 pix->height = mf.height;
572 pix->field = mf.field;
573 pix->colorspace = mf.colorspace;
574 icd->current_fmt = xlate;
575
576 dev_dbg(icd->parent, "Finally set format %dx%d\n",
577 pix->width, pix->height);
578
579 return ret;
580 }
581
582 static int isi_camera_try_fmt(struct soc_camera_device *icd,
583 struct v4l2_format *f)
584 {
585 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
586 const struct soc_camera_format_xlate *xlate;
587 struct v4l2_pix_format *pix = &f->fmt.pix;
588 struct v4l2_mbus_framefmt mf;
589 u32 pixfmt = pix->pixelformat;
590 int ret;
591
592 xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
593 if (pixfmt && !xlate) {
594 dev_warn(icd->parent, "Format %x not found\n", pixfmt);
595 return -EINVAL;
596 }
597
598 /* limit to Atmel ISI hardware capabilities */
599 if (pix->height > MAX_SUPPORT_HEIGHT)
600 pix->height = MAX_SUPPORT_HEIGHT;
601 if (pix->width > MAX_SUPPORT_WIDTH)
602 pix->width = MAX_SUPPORT_WIDTH;
603
604 /* limit to sensor capabilities */
605 mf.width = pix->width;
606 mf.height = pix->height;
607 mf.field = pix->field;
608 mf.colorspace = pix->colorspace;
609 mf.code = xlate->code;
610
611 ret = v4l2_subdev_call(sd, video, try_mbus_fmt, &mf);
612 if (ret < 0)
613 return ret;
614
615 pix->width = mf.width;
616 pix->height = mf.height;
617 pix->colorspace = mf.colorspace;
618
619 switch (mf.field) {
620 case V4L2_FIELD_ANY:
621 pix->field = V4L2_FIELD_NONE;
622 break;
623 case V4L2_FIELD_NONE:
624 break;
625 default:
626 dev_err(icd->parent, "Field type %d unsupported.\n",
627 mf.field);
628 ret = -EINVAL;
629 }
630
631 return ret;
632 }
633
634 static const struct soc_mbus_pixelfmt isi_camera_formats[] = {
635 {
636 .fourcc = V4L2_PIX_FMT_YUYV,
637 .name = "Packed YUV422 16 bit",
638 .bits_per_sample = 8,
639 .packing = SOC_MBUS_PACKING_2X8_PADHI,
640 .order = SOC_MBUS_ORDER_LE,
641 },
642 };
643
644 /* This will be corrected as we get more formats */
645 static bool isi_camera_packing_supported(const struct soc_mbus_pixelfmt *fmt)
646 {
647 return fmt->packing == SOC_MBUS_PACKING_NONE ||
648 (fmt->bits_per_sample == 8 &&
649 fmt->packing == SOC_MBUS_PACKING_2X8_PADHI) ||
650 (fmt->bits_per_sample > 8 &&
651 fmt->packing == SOC_MBUS_PACKING_EXTEND16);
652 }
653
654 #define ISI_BUS_PARAM (V4L2_MBUS_MASTER | \
655 V4L2_MBUS_HSYNC_ACTIVE_HIGH | \
656 V4L2_MBUS_HSYNC_ACTIVE_LOW | \
657 V4L2_MBUS_VSYNC_ACTIVE_HIGH | \
658 V4L2_MBUS_VSYNC_ACTIVE_LOW | \
659 V4L2_MBUS_PCLK_SAMPLE_RISING | \
660 V4L2_MBUS_PCLK_SAMPLE_FALLING | \
661 V4L2_MBUS_DATA_ACTIVE_HIGH)
662
663 static int isi_camera_try_bus_param(struct soc_camera_device *icd,
664 unsigned char buswidth)
665 {
666 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
667 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
668 struct atmel_isi *isi = ici->priv;
669 struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
670 unsigned long common_flags;
671 int ret;
672
673 ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
674 if (!ret) {
675 common_flags = soc_mbus_config_compatible(&cfg,
676 ISI_BUS_PARAM);
677 if (!common_flags) {
678 dev_warn(icd->parent,
679 "Flags incompatible: camera 0x%x, host 0x%x\n",
680 cfg.flags, ISI_BUS_PARAM);
681 return -EINVAL;
682 }
683 } else if (ret != -ENOIOCTLCMD) {
684 return ret;
685 }
686
687 if ((1 << (buswidth - 1)) & isi->width_flags)
688 return 0;
689 return -EINVAL;
690 }
691
692
693 static int isi_camera_get_formats(struct soc_camera_device *icd,
694 unsigned int idx,
695 struct soc_camera_format_xlate *xlate)
696 {
697 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
698 int formats = 0, ret;
699 /* sensor format */
700 enum v4l2_mbus_pixelcode code;
701 /* soc camera host format */
702 const struct soc_mbus_pixelfmt *fmt;
703
704 ret = v4l2_subdev_call(sd, video, enum_mbus_fmt, idx, &code);
705 if (ret < 0)
706 /* No more formats */
707 return 0;
708
709 fmt = soc_mbus_get_fmtdesc(code);
710 if (!fmt) {
711 dev_err(icd->parent,
712 "Invalid format code #%u: %d\n", idx, code);
713 return 0;
714 }
715
716 /* This also checks support for the requested bits-per-sample */
717 ret = isi_camera_try_bus_param(icd, fmt->bits_per_sample);
718 if (ret < 0) {
719 dev_err(icd->parent,
720 "Fail to try the bus parameters.\n");
721 return 0;
722 }
723
724 switch (code) {
725 case V4L2_MBUS_FMT_UYVY8_2X8:
726 case V4L2_MBUS_FMT_VYUY8_2X8:
727 case V4L2_MBUS_FMT_YUYV8_2X8:
728 case V4L2_MBUS_FMT_YVYU8_2X8:
729 formats++;
730 if (xlate) {
731 xlate->host_fmt = &isi_camera_formats[0];
732 xlate->code = code;
733 xlate++;
734 dev_dbg(icd->parent, "Providing format %s using code %d\n",
735 isi_camera_formats[0].name, code);
736 }
737 break;
738 default:
739 if (!isi_camera_packing_supported(fmt))
740 return 0;
741 if (xlate)
742 dev_dbg(icd->parent,
743 "Providing format %s in pass-through mode\n",
744 fmt->name);
745 }
746
747 /* Generic pass-through */
748 formats++;
749 if (xlate) {
750 xlate->host_fmt = fmt;
751 xlate->code = code;
752 xlate++;
753 }
754
755 return formats;
756 }
757
758 /* Called with .video_lock held */
759 static int isi_camera_add_device(struct soc_camera_device *icd)
760 {
761 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
762 struct atmel_isi *isi = ici->priv;
763 int ret;
764
765 if (isi->icd)
766 return -EBUSY;
767
768 ret = clk_enable(isi->pclk);
769 if (ret)
770 return ret;
771
772 ret = clk_enable(isi->mck);
773 if (ret) {
774 clk_disable(isi->pclk);
775 return ret;
776 }
777
778 isi->icd = icd;
779 dev_dbg(icd->parent, "Atmel ISI Camera driver attached to camera %d\n",
780 icd->devnum);
781 return 0;
782 }
783 /* Called with .video_lock held */
784 static void isi_camera_remove_device(struct soc_camera_device *icd)
785 {
786 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
787 struct atmel_isi *isi = ici->priv;
788
789 BUG_ON(icd != isi->icd);
790
791 clk_disable(isi->mck);
792 clk_disable(isi->pclk);
793 isi->icd = NULL;
794
795 dev_dbg(icd->parent, "Atmel ISI Camera driver detached from camera %d\n",
796 icd->devnum);
797 }
798
799 static unsigned int isi_camera_poll(struct file *file, poll_table *pt)
800 {
801 struct soc_camera_device *icd = file->private_data;
802
803 return vb2_poll(&icd->vb2_vidq, file, pt);
804 }
805
806 static int isi_camera_querycap(struct soc_camera_host *ici,
807 struct v4l2_capability *cap)
808 {
809 strcpy(cap->driver, "atmel-isi");
810 strcpy(cap->card, "Atmel Image Sensor Interface");
811 cap->capabilities = (V4L2_CAP_VIDEO_CAPTURE |
812 V4L2_CAP_STREAMING);
813 return 0;
814 }
815
816 static int isi_camera_set_bus_param(struct soc_camera_device *icd)
817 {
818 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
819 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
820 struct atmel_isi *isi = ici->priv;
821 struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
822 unsigned long common_flags;
823 int ret;
824 u32 cfg1 = 0;
825
826 ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
827 if (!ret) {
828 common_flags = soc_mbus_config_compatible(&cfg,
829 ISI_BUS_PARAM);
830 if (!common_flags) {
831 dev_warn(icd->parent,
832 "Flags incompatible: camera 0x%x, host 0x%x\n",
833 cfg.flags, ISI_BUS_PARAM);
834 return -EINVAL;
835 }
836 } else if (ret != -ENOIOCTLCMD) {
837 return ret;
838 } else {
839 common_flags = ISI_BUS_PARAM;
840 }
841 dev_dbg(icd->parent, "Flags cam: 0x%x host: 0x%x common: 0x%lx\n",
842 cfg.flags, ISI_BUS_PARAM, common_flags);
843
844 /* Make choises, based on platform preferences */
845 if ((common_flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH) &&
846 (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)) {
847 if (isi->pdata->hsync_act_low)
848 common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_HIGH;
849 else
850 common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_LOW;
851 }
852
853 if ((common_flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH) &&
854 (common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)) {
855 if (isi->pdata->vsync_act_low)
856 common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_HIGH;
857 else
858 common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_LOW;
859 }
860
861 if ((common_flags & V4L2_MBUS_PCLK_SAMPLE_RISING) &&
862 (common_flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)) {
863 if (isi->pdata->pclk_act_falling)
864 common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_RISING;
865 else
866 common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_FALLING;
867 }
868
869 cfg.flags = common_flags;
870 ret = v4l2_subdev_call(sd, video, s_mbus_config, &cfg);
871 if (ret < 0 && ret != -ENOIOCTLCMD) {
872 dev_dbg(icd->parent, "camera s_mbus_config(0x%lx) returned %d\n",
873 common_flags, ret);
874 return ret;
875 }
876
877 /* set bus param for ISI */
878 if (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)
879 cfg1 |= ISI_CFG1_HSYNC_POL_ACTIVE_LOW;
880 if (common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
881 cfg1 |= ISI_CFG1_VSYNC_POL_ACTIVE_LOW;
882 if (common_flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)
883 cfg1 |= ISI_CFG1_PIXCLK_POL_ACTIVE_FALLING;
884
885 if (isi->pdata->has_emb_sync)
886 cfg1 |= ISI_CFG1_EMB_SYNC;
887 if (isi->pdata->full_mode)
888 cfg1 |= ISI_CFG1_FULL_MODE;
889
890 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
891 isi_writel(isi, ISI_CFG1, cfg1);
892
893 return 0;
894 }
895
896 static struct soc_camera_host_ops isi_soc_camera_host_ops = {
897 .owner = THIS_MODULE,
898 .add = isi_camera_add_device,
899 .remove = isi_camera_remove_device,
900 .set_fmt = isi_camera_set_fmt,
901 .try_fmt = isi_camera_try_fmt,
902 .get_formats = isi_camera_get_formats,
903 .init_videobuf2 = isi_camera_init_videobuf,
904 .poll = isi_camera_poll,
905 .querycap = isi_camera_querycap,
906 .set_bus_param = isi_camera_set_bus_param,
907 };
908
909 /* -----------------------------------------------------------------------*/
910 static int __devexit atmel_isi_remove(struct platform_device *pdev)
911 {
912 struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
913 struct atmel_isi *isi = container_of(soc_host,
914 struct atmel_isi, soc_host);
915
916 free_irq(isi->irq, isi);
917 soc_camera_host_unregister(soc_host);
918 vb2_dma_contig_cleanup_ctx(isi->alloc_ctx);
919 dma_free_coherent(&pdev->dev,
920 sizeof(struct fbd) * MAX_BUFFER_NUM,
921 isi->p_fb_descriptors,
922 isi->fb_descriptors_phys);
923
924 iounmap(isi->regs);
925 clk_unprepare(isi->mck);
926 clk_put(isi->mck);
927 clk_unprepare(isi->pclk);
928 clk_put(isi->pclk);
929 kfree(isi);
930
931 return 0;
932 }
933
934 static int __devinit atmel_isi_probe(struct platform_device *pdev)
935 {
936 unsigned int irq;
937 struct atmel_isi *isi;
938 struct clk *pclk;
939 struct resource *regs;
940 int ret, i;
941 struct device *dev = &pdev->dev;
942 struct soc_camera_host *soc_host;
943 struct isi_platform_data *pdata;
944
945 pdata = dev->platform_data;
946 if (!pdata || !pdata->data_width_flags || !pdata->mck_hz) {
947 dev_err(&pdev->dev,
948 "No config available for Atmel ISI\n");
949 return -EINVAL;
950 }
951
952 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
953 if (!regs)
954 return -ENXIO;
955
956 pclk = clk_get(&pdev->dev, "isi_clk");
957 if (IS_ERR(pclk))
958 return PTR_ERR(pclk);
959
960 ret = clk_prepare(pclk);
961 if (ret)
962 goto err_clk_prepare_pclk;
963
964 isi = kzalloc(sizeof(struct atmel_isi), GFP_KERNEL);
965 if (!isi) {
966 ret = -ENOMEM;
967 dev_err(&pdev->dev, "Can't allocate interface!\n");
968 goto err_alloc_isi;
969 }
970
971 isi->pclk = pclk;
972 isi->pdata = pdata;
973 isi->active = NULL;
974 spin_lock_init(&isi->lock);
975 init_waitqueue_head(&isi->vsync_wq);
976 INIT_LIST_HEAD(&isi->video_buffer_list);
977 INIT_LIST_HEAD(&isi->dma_desc_head);
978
979 /* Get ISI_MCK, provided by programmable clock or external clock */
980 isi->mck = clk_get(dev, "isi_mck");
981 if (IS_ERR(isi->mck)) {
982 dev_err(dev, "Failed to get isi_mck\n");
983 ret = PTR_ERR(isi->mck);
984 goto err_clk_get;
985 }
986
987 ret = clk_prepare(isi->mck);
988 if (ret)
989 goto err_clk_prepare_mck;
990
991 /* Set ISI_MCK's frequency, it should be faster than pixel clock */
992 ret = clk_set_rate(isi->mck, pdata->mck_hz);
993 if (ret < 0)
994 goto err_set_mck_rate;
995
996 isi->p_fb_descriptors = dma_alloc_coherent(&pdev->dev,
997 sizeof(struct fbd) * MAX_BUFFER_NUM,
998 &isi->fb_descriptors_phys,
999 GFP_KERNEL);
1000 if (!isi->p_fb_descriptors) {
1001 ret = -ENOMEM;
1002 dev_err(&pdev->dev, "Can't allocate descriptors!\n");
1003 goto err_alloc_descriptors;
1004 }
1005
1006 for (i = 0; i < MAX_BUFFER_NUM; i++) {
1007 isi->dma_desc[i].p_fbd = isi->p_fb_descriptors + i;
1008 isi->dma_desc[i].fbd_phys = isi->fb_descriptors_phys +
1009 i * sizeof(struct fbd);
1010 list_add(&isi->dma_desc[i].list, &isi->dma_desc_head);
1011 }
1012
1013 isi->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
1014 if (IS_ERR(isi->alloc_ctx)) {
1015 ret = PTR_ERR(isi->alloc_ctx);
1016 goto err_alloc_ctx;
1017 }
1018
1019 isi->regs = ioremap(regs->start, resource_size(regs));
1020 if (!isi->regs) {
1021 ret = -ENOMEM;
1022 goto err_ioremap;
1023 }
1024
1025 if (pdata->data_width_flags & ISI_DATAWIDTH_8)
1026 isi->width_flags = 1 << 7;
1027 if (pdata->data_width_flags & ISI_DATAWIDTH_10)
1028 isi->width_flags |= 1 << 9;
1029
1030 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
1031
1032 irq = platform_get_irq(pdev, 0);
1033 if (irq < 0) {
1034 ret = irq;
1035 goto err_req_irq;
1036 }
1037
1038 ret = request_irq(irq, isi_interrupt, 0, "isi", isi);
1039 if (ret) {
1040 dev_err(&pdev->dev, "Unable to request irq %d\n", irq);
1041 goto err_req_irq;
1042 }
1043 isi->irq = irq;
1044
1045 soc_host = &isi->soc_host;
1046 soc_host->drv_name = "isi-camera";
1047 soc_host->ops = &isi_soc_camera_host_ops;
1048 soc_host->priv = isi;
1049 soc_host->v4l2_dev.dev = &pdev->dev;
1050 soc_host->nr = pdev->id;
1051
1052 ret = soc_camera_host_register(soc_host);
1053 if (ret) {
1054 dev_err(&pdev->dev, "Unable to register soc camera host\n");
1055 goto err_register_soc_camera_host;
1056 }
1057 return 0;
1058
1059 err_register_soc_camera_host:
1060 free_irq(isi->irq, isi);
1061 err_req_irq:
1062 iounmap(isi->regs);
1063 err_ioremap:
1064 vb2_dma_contig_cleanup_ctx(isi->alloc_ctx);
1065 err_alloc_ctx:
1066 dma_free_coherent(&pdev->dev,
1067 sizeof(struct fbd) * MAX_BUFFER_NUM,
1068 isi->p_fb_descriptors,
1069 isi->fb_descriptors_phys);
1070 err_alloc_descriptors:
1071 err_set_mck_rate:
1072 clk_unprepare(isi->mck);
1073 err_clk_prepare_mck:
1074 clk_put(isi->mck);
1075 err_clk_get:
1076 kfree(isi);
1077 err_alloc_isi:
1078 clk_unprepare(pclk);
1079 err_clk_prepare_pclk:
1080 clk_put(pclk);
1081
1082 return ret;
1083 }
1084
1085 static struct platform_driver atmel_isi_driver = {
1086 .probe = atmel_isi_probe,
1087 .remove = __devexit_p(atmel_isi_remove),
1088 .driver = {
1089 .name = "atmel_isi",
1090 .owner = THIS_MODULE,
1091 },
1092 };
1093
1094 static int __init atmel_isi_init_module(void)
1095 {
1096 return platform_driver_probe(&atmel_isi_driver, &atmel_isi_probe);
1097 }
1098
1099 static void __exit atmel_isi_exit(void)
1100 {
1101 platform_driver_unregister(&atmel_isi_driver);
1102 }
1103 module_init(atmel_isi_init_module);
1104 module_exit(atmel_isi_exit);
1105
1106 MODULE_AUTHOR("Josh Wu <josh.wu@atmel.com>");
1107 MODULE_DESCRIPTION("The V4L2 driver for Atmel Linux");
1108 MODULE_LICENSE("GPL");
1109 MODULE_SUPPORTED_DEVICE("video");
Linus' kernel tree