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[media] media: vb2: change queue initialization order
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / media / video / atmel-isi.c
blob774715d2f84f33a52cc4b9fd98fbf667b2630abf
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 struct clk *pclk;
94 unsigned int irq;
95
96 struct isi_platform_data *pdata;
97
98 struct list_head video_buffer_list;
99 struct frame_buffer *active;
100
101 struct soc_camera_device *icd;
102 struct soc_camera_host soc_host;
103 };
104
105 static void isi_writel(struct atmel_isi *isi, u32 reg, u32 val)
106 {
107 writel(val, isi->regs + reg);
108 }
109 static u32 isi_readl(struct atmel_isi *isi, u32 reg)
110 {
111 return readl(isi->regs + reg);
112 }
113
114 static int configure_geometry(struct atmel_isi *isi, u32 width,
115 u32 height, enum v4l2_mbus_pixelcode code)
116 {
117 u32 cfg2, cr;
118
119 switch (code) {
120 /* YUV, including grey */
121 case V4L2_MBUS_FMT_Y8_1X8:
122 cr = ISI_CFG2_GRAYSCALE;
123 break;
124 case V4L2_MBUS_FMT_UYVY8_2X8:
125 cr = ISI_CFG2_YCC_SWAP_MODE_3;
126 break;
127 case V4L2_MBUS_FMT_VYUY8_2X8:
128 cr = ISI_CFG2_YCC_SWAP_MODE_2;
129 break;
130 case V4L2_MBUS_FMT_YUYV8_2X8:
131 cr = ISI_CFG2_YCC_SWAP_MODE_1;
132 break;
133 case V4L2_MBUS_FMT_YVYU8_2X8:
134 cr = ISI_CFG2_YCC_SWAP_DEFAULT;
135 break;
136 /* RGB, TODO */
137 default:
138 return -EINVAL;
139 }
140
141 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
142
143 cfg2 = isi_readl(isi, ISI_CFG2);
144 cfg2 |= cr;
145 /* Set width */
146 cfg2 &= ~(ISI_CFG2_IM_HSIZE_MASK);
147 cfg2 |= ((width - 1) << ISI_CFG2_IM_HSIZE_OFFSET) &
148 ISI_CFG2_IM_HSIZE_MASK;
149 /* Set height */
150 cfg2 &= ~(ISI_CFG2_IM_VSIZE_MASK);
151 cfg2 |= ((height - 1) << ISI_CFG2_IM_VSIZE_OFFSET)
152 & ISI_CFG2_IM_VSIZE_MASK;
153 isi_writel(isi, ISI_CFG2, cfg2);
154
155 return 0;
156 }
157
158 static irqreturn_t atmel_isi_handle_streaming(struct atmel_isi *isi)
159 {
160 if (isi->active) {
161 struct vb2_buffer *vb = &isi->active->vb;
162 struct frame_buffer *buf = isi->active;
163
164 list_del_init(&buf->list);
165 do_gettimeofday(&vb->v4l2_buf.timestamp);
166 vb->v4l2_buf.sequence = isi->sequence++;
167 vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
168 }
169
170 if (list_empty(&isi->video_buffer_list)) {
171 isi->active = NULL;
172 } else {
173 /* start next dma frame. */
174 isi->active = list_entry(isi->video_buffer_list.next,
175 struct frame_buffer, list);
176 isi_writel(isi, ISI_DMA_C_DSCR,
177 isi->active->p_dma_desc->fbd_phys);
178 isi_writel(isi, ISI_DMA_C_CTRL,
179 ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
180 isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_C_CH);
181 }
182 return IRQ_HANDLED;
183 }
184
185 /* ISI interrupt service routine */
186 static irqreturn_t isi_interrupt(int irq, void *dev_id)
187 {
188 struct atmel_isi *isi = dev_id;
189 u32 status, mask, pending;
190 irqreturn_t ret = IRQ_NONE;
191
192 spin_lock(&isi->lock);
193
194 status = isi_readl(isi, ISI_STATUS);
195 mask = isi_readl(isi, ISI_INTMASK);
196 pending = status & mask;
197
198 if (pending & ISI_CTRL_SRST) {
199 complete(&isi->complete);
200 isi_writel(isi, ISI_INTDIS, ISI_CTRL_SRST);
201 ret = IRQ_HANDLED;
202 } else if (pending & ISI_CTRL_DIS) {
203 complete(&isi->complete);
204 isi_writel(isi, ISI_INTDIS, ISI_CTRL_DIS);
205 ret = IRQ_HANDLED;
206 } else {
207 if ((pending & ISI_SR_VSYNC) &&
208 (isi->state == ISI_STATE_IDLE)) {
209 isi->state = ISI_STATE_READY;
210 wake_up_interruptible(&isi->vsync_wq);
211 ret = IRQ_HANDLED;
212 }
213 if (likely(pending & ISI_SR_CXFR_DONE))
214 ret = atmel_isi_handle_streaming(isi);
215 }
216
217 spin_unlock(&isi->lock);
218 return ret;
219 }
220
221 #define WAIT_ISI_RESET 1
222 #define WAIT_ISI_DISABLE 0
223 static int atmel_isi_wait_status(struct atmel_isi *isi, int wait_reset)
224 {
225 unsigned long timeout;
226 /*
227 * The reset or disable will only succeed if we have a
228 * pixel clock from the camera.
229 */
230 init_completion(&isi->complete);
231
232 if (wait_reset) {
233 isi_writel(isi, ISI_INTEN, ISI_CTRL_SRST);
234 isi_writel(isi, ISI_CTRL, ISI_CTRL_SRST);
235 } else {
236 isi_writel(isi, ISI_INTEN, ISI_CTRL_DIS);
237 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
238 }
239
240 timeout = wait_for_completion_timeout(&isi->complete,
241 msecs_to_jiffies(100));
242 if (timeout == 0)
243 return -ETIMEDOUT;
244
245 return 0;
246 }
247
248 /* ------------------------------------------------------------------
249 Videobuf operations
250 ------------------------------------------------------------------*/
251 static int queue_setup(struct vb2_queue *vq, unsigned int *nbuffers,
252 unsigned int *nplanes, unsigned int sizes[],
253 void *alloc_ctxs[])
254 {
255 struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
256 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
257 struct atmel_isi *isi = ici->priv;
258 unsigned long size;
259 int ret, bytes_per_line;
260
261 /* Reset ISI */
262 ret = atmel_isi_wait_status(isi, WAIT_ISI_RESET);
263 if (ret < 0) {
264 dev_err(icd->parent, "Reset ISI timed out\n");
265 return ret;
266 }
267 /* Disable all interrupts */
268 isi_writel(isi, ISI_INTDIS, ~0UL);
269
270 bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
271 icd->current_fmt->host_fmt);
272
273 if (bytes_per_line < 0)
274 return bytes_per_line;
275
276 size = bytes_per_line * icd->user_height;
277
278 if (!*nbuffers || *nbuffers > MAX_BUFFER_NUM)
279 *nbuffers = MAX_BUFFER_NUM;
280
281 if (size * *nbuffers > VID_LIMIT_BYTES)
282 *nbuffers = VID_LIMIT_BYTES / size;
283
284 *nplanes = 1;
285 sizes[0] = size;
286 alloc_ctxs[0] = isi->alloc_ctx;
287
288 isi->sequence = 0;
289 isi->active = NULL;
290
291 dev_dbg(icd->parent, "%s, count=%d, size=%ld\n", __func__,
292 *nbuffers, size);
293
294 return 0;
295 }
296
297 static int buffer_init(struct vb2_buffer *vb)
298 {
299 struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
300
301 buf->p_dma_desc = NULL;
302 INIT_LIST_HEAD(&buf->list);
303
304 return 0;
305 }
306
307 static int buffer_prepare(struct vb2_buffer *vb)
308 {
309 struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
310 struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
311 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
312 struct atmel_isi *isi = ici->priv;
313 unsigned long size;
314 struct isi_dma_desc *desc;
315 int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
316 icd->current_fmt->host_fmt);
317
318 if (bytes_per_line < 0)
319 return bytes_per_line;
320
321 size = bytes_per_line * icd->user_height;
322
323 if (vb2_plane_size(vb, 0) < size) {
324 dev_err(icd->parent, "%s data will not fit into plane (%lu < %lu)\n",
325 __func__, vb2_plane_size(vb, 0), size);
326 return -EINVAL;
327 }
328
329 vb2_set_plane_payload(&buf->vb, 0, size);
330
331 if (!buf->p_dma_desc) {
332 if (list_empty(&isi->dma_desc_head)) {
333 dev_err(icd->parent, "Not enough dma descriptors.\n");
334 return -EINVAL;
335 } else {
336 /* Get an available descriptor */
337 desc = list_entry(isi->dma_desc_head.next,
338 struct isi_dma_desc, list);
339 /* Delete the descriptor since now it is used */
340 list_del_init(&desc->list);
341
342 /* Initialize the dma descriptor */
343 desc->p_fbd->fb_address =
344 vb2_dma_contig_plane_dma_addr(vb, 0);
345 desc->p_fbd->next_fbd_address = 0;
346 set_dma_ctrl(desc->p_fbd, ISI_DMA_CTRL_WB);
347
348 buf->p_dma_desc = desc;
349 }
350 }
351 return 0;
352 }
353
354 static void buffer_cleanup(struct vb2_buffer *vb)
355 {
356 struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
357 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
358 struct atmel_isi *isi = ici->priv;
359 struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
360
361 /* This descriptor is available now and we add to head list */
362 if (buf->p_dma_desc)
363 list_add(&buf->p_dma_desc->list, &isi->dma_desc_head);
364 }
365
366 static void start_dma(struct atmel_isi *isi, struct frame_buffer *buffer)
367 {
368 u32 ctrl, cfg1;
369
370 cfg1 = isi_readl(isi, ISI_CFG1);
371 /* Enable irq: cxfr for the codec path, pxfr for the preview path */
372 isi_writel(isi, ISI_INTEN,
373 ISI_SR_CXFR_DONE | ISI_SR_PXFR_DONE);
374
375 /* Check if already in a frame */
376 if (isi_readl(isi, ISI_STATUS) & ISI_CTRL_CDC) {
377 dev_err(isi->icd->parent, "Already in frame handling.\n");
378 return;
379 }
380
381 isi_writel(isi, ISI_DMA_C_DSCR, buffer->p_dma_desc->fbd_phys);
382 isi_writel(isi, ISI_DMA_C_CTRL, ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
383 isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_C_CH);
384
385 /* Enable linked list */
386 cfg1 |= isi->pdata->frate | ISI_CFG1_DISCR;
387
388 /* Enable codec path and ISI */
389 ctrl = ISI_CTRL_CDC | ISI_CTRL_EN;
390 isi_writel(isi, ISI_CTRL, ctrl);
391 isi_writel(isi, ISI_CFG1, cfg1);
392 }
393
394 static void buffer_queue(struct vb2_buffer *vb)
395 {
396 struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
397 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
398 struct atmel_isi *isi = ici->priv;
399 struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
400 unsigned long flags = 0;
401
402 spin_lock_irqsave(&isi->lock, flags);
403 list_add_tail(&buf->list, &isi->video_buffer_list);
404
405 if (isi->active == NULL) {
406 isi->active = buf;
407 if (vb2_is_streaming(vb->vb2_queue))
408 start_dma(isi, buf);
409 }
410 spin_unlock_irqrestore(&isi->lock, flags);
411 }
412
413 static int start_streaming(struct vb2_queue *vq, unsigned int count)
414 {
415 struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
416 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
417 struct atmel_isi *isi = ici->priv;
418
419 u32 sr = 0;
420 int ret;
421
422 spin_lock_irq(&isi->lock);
423 isi->state = ISI_STATE_IDLE;
424 /* Clear any pending SOF interrupt */
425 sr = isi_readl(isi, ISI_STATUS);
426 /* Enable VSYNC interrupt for SOF */
427 isi_writel(isi, ISI_INTEN, ISI_SR_VSYNC);
428 isi_writel(isi, ISI_CTRL, ISI_CTRL_EN);
429 spin_unlock_irq(&isi->lock);
430
431 dev_dbg(icd->parent, "Waiting for SOF\n");
432 ret = wait_event_interruptible(isi->vsync_wq,
433 isi->state != ISI_STATE_IDLE);
434 if (ret)
435 goto err;
436
437 if (isi->state != ISI_STATE_READY) {
438 ret = -EIO;
439 goto err;
440 }
441
442 spin_lock_irq(&isi->lock);
443 isi->state = ISI_STATE_WAIT_SOF;
444 isi_writel(isi, ISI_INTDIS, ISI_SR_VSYNC);
445 if (count)
446 start_dma(isi, isi->active);
447 spin_unlock_irq(&isi->lock);
448
449 return 0;
450 err:
451 isi->active = NULL;
452 isi->sequence = 0;
453 INIT_LIST_HEAD(&isi->video_buffer_list);
454 return ret;
455 }
456
457 /* abort streaming and wait for last buffer */
458 static int stop_streaming(struct vb2_queue *vq)
459 {
460 struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
461 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
462 struct atmel_isi *isi = ici->priv;
463 struct frame_buffer *buf, *node;
464 int ret = 0;
465 unsigned long timeout;
466
467 spin_lock_irq(&isi->lock);
468 isi->active = NULL;
469 /* Release all active buffers */
470 list_for_each_entry_safe(buf, node, &isi->video_buffer_list, list) {
471 list_del_init(&buf->list);
472 vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
473 }
474 spin_unlock_irq(&isi->lock);
475
476 timeout = jiffies + FRAME_INTERVAL_MILLI_SEC * HZ;
477 /* Wait until the end of the current frame. */
478 while ((isi_readl(isi, ISI_STATUS) & ISI_CTRL_CDC) &&
479 time_before(jiffies, timeout))
480 msleep(1);
481
482 if (time_after(jiffies, timeout)) {
483 dev_err(icd->parent,
484 "Timeout waiting for finishing codec request\n");
485 return -ETIMEDOUT;
486 }
487
488 /* Disable interrupts */
489 isi_writel(isi, ISI_INTDIS,
490 ISI_SR_CXFR_DONE | ISI_SR_PXFR_DONE);
491
492 /* Disable ISI and wait for it is done */
493 ret = atmel_isi_wait_status(isi, WAIT_ISI_DISABLE);
494 if (ret < 0)
495 dev_err(icd->parent, "Disable ISI timed out\n");
496
497 return ret;
498 }
499
500 static struct vb2_ops isi_video_qops = {
501 .queue_setup = queue_setup,
502 .buf_init = buffer_init,
503 .buf_prepare = buffer_prepare,
504 .buf_cleanup = buffer_cleanup,
505 .buf_queue = buffer_queue,
506 .start_streaming = start_streaming,
507 .stop_streaming = stop_streaming,
508 .wait_prepare = soc_camera_unlock,
509 .wait_finish = soc_camera_lock,
510 };
511
512 /* ------------------------------------------------------------------
513 SOC camera operations for the device
514 ------------------------------------------------------------------*/
515 static int isi_camera_init_videobuf(struct vb2_queue *q,
516 struct soc_camera_device *icd)
517 {
518 q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
519 q->io_modes = VB2_MMAP;
520 q->drv_priv = icd;
521 q->buf_struct_size = sizeof(struct frame_buffer);
522 q->ops = &isi_video_qops;
523 q->mem_ops = &vb2_dma_contig_memops;
524
525 return vb2_queue_init(q);
526 }
527
528 static int isi_camera_set_fmt(struct soc_camera_device *icd,
529 struct v4l2_format *f)
530 {
531 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
532 struct atmel_isi *isi = ici->priv;
533 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
534 const struct soc_camera_format_xlate *xlate;
535 struct v4l2_pix_format *pix = &f->fmt.pix;
536 struct v4l2_mbus_framefmt mf;
537 int ret;
538
539 xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
540 if (!xlate) {
541 dev_warn(icd->parent, "Format %x not found\n",
542 pix->pixelformat);
543 return -EINVAL;
544 }
545
546 dev_dbg(icd->parent, "Plan to set format %dx%d\n",
547 pix->width, pix->height);
548
549 mf.width = pix->width;
550 mf.height = pix->height;
551 mf.field = pix->field;
552 mf.colorspace = pix->colorspace;
553 mf.code = xlate->code;
554
555 ret = v4l2_subdev_call(sd, video, s_mbus_fmt, &mf);
556 if (ret < 0)
557 return ret;
558
559 if (mf.code != xlate->code)
560 return -EINVAL;
561
562 ret = configure_geometry(isi, pix->width, pix->height, xlate->code);
563 if (ret < 0)
564 return ret;
565
566 pix->width = mf.width;
567 pix->height = mf.height;
568 pix->field = mf.field;
569 pix->colorspace = mf.colorspace;
570 icd->current_fmt = xlate;
571
572 dev_dbg(icd->parent, "Finally set format %dx%d\n",
573 pix->width, pix->height);
574
575 return ret;
576 }
577
578 static int isi_camera_try_fmt(struct soc_camera_device *icd,
579 struct v4l2_format *f)
580 {
581 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
582 const struct soc_camera_format_xlate *xlate;
583 struct v4l2_pix_format *pix = &f->fmt.pix;
584 struct v4l2_mbus_framefmt mf;
585 u32 pixfmt = pix->pixelformat;
586 int ret;
587
588 xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
589 if (pixfmt && !xlate) {
590 dev_warn(icd->parent, "Format %x not found\n", pixfmt);
591 return -EINVAL;
592 }
593
594 /* limit to Atmel ISI hardware capabilities */
595 if (pix->height > MAX_SUPPORT_HEIGHT)
596 pix->height = MAX_SUPPORT_HEIGHT;
597 if (pix->width > MAX_SUPPORT_WIDTH)
598 pix->width = MAX_SUPPORT_WIDTH;
599
600 /* limit to sensor capabilities */
601 mf.width = pix->width;
602 mf.height = pix->height;
603 mf.field = pix->field;
604 mf.colorspace = pix->colorspace;
605 mf.code = xlate->code;
606
607 ret = v4l2_subdev_call(sd, video, try_mbus_fmt, &mf);
608 if (ret < 0)
609 return ret;
610
611 pix->width = mf.width;
612 pix->height = mf.height;
613 pix->colorspace = mf.colorspace;
614
615 switch (mf.field) {
616 case V4L2_FIELD_ANY:
617 pix->field = V4L2_FIELD_NONE;
618 break;
619 case V4L2_FIELD_NONE:
620 break;
621 default:
622 dev_err(icd->parent, "Field type %d unsupported.\n",
623 mf.field);
624 ret = -EINVAL;
625 }
626
627 return ret;
628 }
629
630 static const struct soc_mbus_pixelfmt isi_camera_formats[] = {
631 {
632 .fourcc = V4L2_PIX_FMT_YUYV,
633 .name = "Packed YUV422 16 bit",
634 .bits_per_sample = 8,
635 .packing = SOC_MBUS_PACKING_2X8_PADHI,
636 .order = SOC_MBUS_ORDER_LE,
637 },
638 };
639
640 /* This will be corrected as we get more formats */
641 static bool isi_camera_packing_supported(const struct soc_mbus_pixelfmt *fmt)
642 {
643 return fmt->packing == SOC_MBUS_PACKING_NONE ||
644 (fmt->bits_per_sample == 8 &&
645 fmt->packing == SOC_MBUS_PACKING_2X8_PADHI) ||
646 (fmt->bits_per_sample > 8 &&
647 fmt->packing == SOC_MBUS_PACKING_EXTEND16);
648 }
649
650 static unsigned long make_bus_param(struct atmel_isi *isi)
651 {
652 unsigned long flags;
653 /*
654 * Platform specified synchronization and pixel clock polarities are
655 * only a recommendation and are only used during probing. Atmel ISI
656 * camera interface only works in master mode, i.e., uses HSYNC and
657 * VSYNC signals from the sensor
658 */
659 flags = SOCAM_MASTER |
660 SOCAM_HSYNC_ACTIVE_HIGH |
661 SOCAM_HSYNC_ACTIVE_LOW |
662 SOCAM_VSYNC_ACTIVE_HIGH |
663 SOCAM_VSYNC_ACTIVE_LOW |
664 SOCAM_PCLK_SAMPLE_RISING |
665 SOCAM_PCLK_SAMPLE_FALLING |
666 SOCAM_DATA_ACTIVE_HIGH;
667
668 if (isi->pdata->data_width_flags & ISI_DATAWIDTH_10)
669 flags |= SOCAM_DATAWIDTH_10;
670
671 if (isi->pdata->data_width_flags & ISI_DATAWIDTH_8)
672 flags |= SOCAM_DATAWIDTH_8;
673
674 if (flags & SOCAM_DATAWIDTH_MASK)
675 return flags;
676
677 return 0;
678 }
679
680 static int isi_camera_try_bus_param(struct soc_camera_device *icd,
681 unsigned char buswidth)
682 {
683 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
684 struct atmel_isi *isi = ici->priv;
685 unsigned long camera_flags;
686 int ret;
687
688 camera_flags = icd->ops->query_bus_param(icd);
689 ret = soc_camera_bus_param_compatible(camera_flags,
690 make_bus_param(isi));
691 if (!ret)
692 return -EINVAL;
693 return 0;
694 }
695
696
697 static int isi_camera_get_formats(struct soc_camera_device *icd,
698 unsigned int idx,
699 struct soc_camera_format_xlate *xlate)
700 {
701 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
702 int formats = 0, ret;
703 /* sensor format */
704 enum v4l2_mbus_pixelcode code;
705 /* soc camera host format */
706 const struct soc_mbus_pixelfmt *fmt;
707
708 ret = v4l2_subdev_call(sd, video, enum_mbus_fmt, idx, &code);
709 if (ret < 0)
710 /* No more formats */
711 return 0;
712
713 fmt = soc_mbus_get_fmtdesc(code);
714 if (!fmt) {
715 dev_err(icd->parent,
716 "Invalid format code #%u: %d\n", idx, code);
717 return 0;
718 }
719
720 /* This also checks support for the requested bits-per-sample */
721 ret = isi_camera_try_bus_param(icd, fmt->bits_per_sample);
722 if (ret < 0) {
723 dev_err(icd->parent,
724 "Fail to try the bus parameters.\n");
725 return 0;
726 }
727
728 switch (code) {
729 case V4L2_MBUS_FMT_UYVY8_2X8:
730 case V4L2_MBUS_FMT_VYUY8_2X8:
731 case V4L2_MBUS_FMT_YUYV8_2X8:
732 case V4L2_MBUS_FMT_YVYU8_2X8:
733 formats++;
734 if (xlate) {
735 xlate->host_fmt = &isi_camera_formats[0];
736 xlate->code = code;
737 xlate++;
738 dev_dbg(icd->parent, "Providing format %s using code %d\n",
739 isi_camera_formats[0].name, code);
740 }
741 break;
742 default:
743 if (!isi_camera_packing_supported(fmt))
744 return 0;
745 if (xlate)
746 dev_dbg(icd->parent,
747 "Providing format %s in pass-through mode\n",
748 fmt->name);
749 }
750
751 /* Generic pass-through */
752 formats++;
753 if (xlate) {
754 xlate->host_fmt = fmt;
755 xlate->code = code;
756 xlate++;
757 }
758
759 return formats;
760 }
761
762 /* Called with .video_lock held */
763 static int isi_camera_add_device(struct soc_camera_device *icd)
764 {
765 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
766 struct atmel_isi *isi = ici->priv;
767 int ret;
768
769 if (isi->icd)
770 return -EBUSY;
771
772 ret = clk_enable(isi->pclk);
773 if (ret)
774 return ret;
775
776 isi->icd = icd;
777 dev_dbg(icd->parent, "Atmel ISI Camera driver attached to camera %d\n",
778 icd->devnum);
779 return 0;
780 }
781 /* Called with .video_lock held */
782 static void isi_camera_remove_device(struct soc_camera_device *icd)
783 {
784 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
785 struct atmel_isi *isi = ici->priv;
786
787 BUG_ON(icd != isi->icd);
788
789 clk_disable(isi->pclk);
790 isi->icd = NULL;
791
792 dev_dbg(icd->parent, "Atmel ISI Camera driver detached from camera %d\n",
793 icd->devnum);
794 }
795
796 static unsigned int isi_camera_poll(struct file *file, poll_table *pt)
797 {
798 struct soc_camera_device *icd = file->private_data;
799
800 return vb2_poll(&icd->vb2_vidq, file, pt);
801 }
802
803 static int isi_camera_querycap(struct soc_camera_host *ici,
804 struct v4l2_capability *cap)
805 {
806 strcpy(cap->driver, "atmel-isi");
807 strcpy(cap->card, "Atmel Image Sensor Interface");
808 cap->capabilities = (V4L2_CAP_VIDEO_CAPTURE |
809 V4L2_CAP_STREAMING);
810 return 0;
811 }
812
813 static int isi_camera_set_bus_param(struct soc_camera_device *icd, u32 pixfmt)
814 {
815 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
816 struct atmel_isi *isi = ici->priv;
817 unsigned long bus_flags, camera_flags, common_flags;
818 int ret;
819 u32 cfg1 = 0;
820
821 camera_flags = icd->ops->query_bus_param(icd);
822
823 bus_flags = make_bus_param(isi);
824 common_flags = soc_camera_bus_param_compatible(camera_flags, bus_flags);
825 dev_dbg(icd->parent, "Flags cam: 0x%lx host: 0x%lx common: 0x%lx\n",
826 camera_flags, bus_flags, common_flags);
827 if (!common_flags)
828 return -EINVAL;
829
830 /* Make choises, based on platform preferences */
831 if ((common_flags & SOCAM_HSYNC_ACTIVE_HIGH) &&
832 (common_flags & SOCAM_HSYNC_ACTIVE_LOW)) {
833 if (isi->pdata->hsync_act_low)
834 common_flags &= ~SOCAM_HSYNC_ACTIVE_HIGH;
835 else
836 common_flags &= ~SOCAM_HSYNC_ACTIVE_LOW;
837 }
838
839 if ((common_flags & SOCAM_VSYNC_ACTIVE_HIGH) &&
840 (common_flags & SOCAM_VSYNC_ACTIVE_LOW)) {
841 if (isi->pdata->vsync_act_low)
842 common_flags &= ~SOCAM_VSYNC_ACTIVE_HIGH;
843 else
844 common_flags &= ~SOCAM_VSYNC_ACTIVE_LOW;
845 }
846
847 if ((common_flags & SOCAM_PCLK_SAMPLE_RISING) &&
848 (common_flags & SOCAM_PCLK_SAMPLE_FALLING)) {
849 if (isi->pdata->pclk_act_falling)
850 common_flags &= ~SOCAM_PCLK_SAMPLE_RISING;
851 else
852 common_flags &= ~SOCAM_PCLK_SAMPLE_FALLING;
853 }
854
855 ret = icd->ops->set_bus_param(icd, common_flags);
856 if (ret < 0) {
857 dev_dbg(icd->parent, "Camera set_bus_param(%lx) returned %d\n",
858 common_flags, ret);
859 return ret;
860 }
861
862 /* set bus param for ISI */
863 if (common_flags & SOCAM_HSYNC_ACTIVE_LOW)
864 cfg1 |= ISI_CFG1_HSYNC_POL_ACTIVE_LOW;
865 if (common_flags & SOCAM_VSYNC_ACTIVE_LOW)
866 cfg1 |= ISI_CFG1_VSYNC_POL_ACTIVE_LOW;
867 if (common_flags & SOCAM_PCLK_SAMPLE_FALLING)
868 cfg1 |= ISI_CFG1_PIXCLK_POL_ACTIVE_FALLING;
869
870 if (isi->pdata->has_emb_sync)
871 cfg1 |= ISI_CFG1_EMB_SYNC;
872 if (isi->pdata->isi_full_mode)
873 cfg1 |= ISI_CFG1_FULL_MODE;
874
875 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
876 isi_writel(isi, ISI_CFG1, cfg1);
877
878 return 0;
879 }
880
881 static struct soc_camera_host_ops isi_soc_camera_host_ops = {
882 .owner = THIS_MODULE,
883 .add = isi_camera_add_device,
884 .remove = isi_camera_remove_device,
885 .set_fmt = isi_camera_set_fmt,
886 .try_fmt = isi_camera_try_fmt,
887 .get_formats = isi_camera_get_formats,
888 .init_videobuf2 = isi_camera_init_videobuf,
889 .poll = isi_camera_poll,
890 .querycap = isi_camera_querycap,
891 .set_bus_param = isi_camera_set_bus_param,
892 };
893
894 /* -----------------------------------------------------------------------*/
895 static int __devexit atmel_isi_remove(struct platform_device *pdev)
896 {
897 struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
898 struct atmel_isi *isi = container_of(soc_host,
899 struct atmel_isi, soc_host);
900
901 free_irq(isi->irq, isi);
902 soc_camera_host_unregister(soc_host);
903 vb2_dma_contig_cleanup_ctx(isi->alloc_ctx);
904 dma_free_coherent(&pdev->dev,
905 sizeof(struct fbd) * MAX_BUFFER_NUM,
906 isi->p_fb_descriptors,
907 isi->fb_descriptors_phys);
908
909 iounmap(isi->regs);
910 clk_put(isi->pclk);
911 kfree(isi);
912
913 return 0;
914 }
915
916 static int __devinit atmel_isi_probe(struct platform_device *pdev)
917 {
918 unsigned int irq;
919 struct atmel_isi *isi;
920 struct clk *pclk;
921 struct resource *regs;
922 int ret, i;
923 struct device *dev = &pdev->dev;
924 struct soc_camera_host *soc_host;
925 struct isi_platform_data *pdata;
926
927 pdata = dev->platform_data;
928 if (!pdata || !pdata->data_width_flags) {
929 dev_err(&pdev->dev,
930 "No config available for Atmel ISI\n");
931 return -EINVAL;
932 }
933
934 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
935 if (!regs)
936 return -ENXIO;
937
938 pclk = clk_get(&pdev->dev, "isi_clk");
939 if (IS_ERR(pclk))
940 return PTR_ERR(pclk);
941
942 isi = kzalloc(sizeof(struct atmel_isi), GFP_KERNEL);
943 if (!isi) {
944 ret = -ENOMEM;
945 dev_err(&pdev->dev, "Can't allocate interface!\n");
946 goto err_alloc_isi;
947 }
948
949 isi->pclk = pclk;
950 isi->pdata = pdata;
951 isi->active = NULL;
952 spin_lock_init(&isi->lock);
953 init_waitqueue_head(&isi->vsync_wq);
954 INIT_LIST_HEAD(&isi->video_buffer_list);
955 INIT_LIST_HEAD(&isi->dma_desc_head);
956
957 isi->p_fb_descriptors = dma_alloc_coherent(&pdev->dev,
958 sizeof(struct fbd) * MAX_BUFFER_NUM,
959 &isi->fb_descriptors_phys,
960 GFP_KERNEL);
961 if (!isi->p_fb_descriptors) {
962 ret = -ENOMEM;
963 dev_err(&pdev->dev, "Can't allocate descriptors!\n");
964 goto err_alloc_descriptors;
965 }
966
967 for (i = 0; i < MAX_BUFFER_NUM; i++) {
968 isi->dma_desc[i].p_fbd = isi->p_fb_descriptors + i;
969 isi->dma_desc[i].fbd_phys = isi->fb_descriptors_phys +
970 i * sizeof(struct fbd);
971 list_add(&isi->dma_desc[i].list, &isi->dma_desc_head);
972 }
973
974 isi->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
975 if (IS_ERR(isi->alloc_ctx)) {
976 ret = PTR_ERR(isi->alloc_ctx);
977 goto err_alloc_ctx;
978 }
979
980 isi->regs = ioremap(regs->start, resource_size(regs));
981 if (!isi->regs) {
982 ret = -ENOMEM;
983 goto err_ioremap;
984 }
985
986 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
987
988 irq = platform_get_irq(pdev, 0);
989 if (irq < 0) {
990 ret = irq;
991 goto err_req_irq;
992 }
993
994 ret = request_irq(irq, isi_interrupt, 0, "isi", isi);
995 if (ret) {
996 dev_err(&pdev->dev, "Unable to request irq %d\n", irq);
997 goto err_req_irq;
998 }
999 isi->irq = irq;
1000
1001 soc_host = &isi->soc_host;
1002 soc_host->drv_name = "isi-camera";
1003 soc_host->ops = &isi_soc_camera_host_ops;
1004 soc_host->priv = isi;
1005 soc_host->v4l2_dev.dev = &pdev->dev;
1006 soc_host->nr = pdev->id;
1007
1008 ret = soc_camera_host_register(soc_host);
1009 if (ret) {
1010 dev_err(&pdev->dev, "Unable to register soc camera host\n");
1011 goto err_register_soc_camera_host;
1012 }
1013 return 0;
1014
1015 err_register_soc_camera_host:
1016 free_irq(isi->irq, isi);
1017 err_req_irq:
1018 iounmap(isi->regs);
1019 err_ioremap:
1020 vb2_dma_contig_cleanup_ctx(isi->alloc_ctx);
1021 err_alloc_ctx:
1022 dma_free_coherent(&pdev->dev,
1023 sizeof(struct fbd) * MAX_BUFFER_NUM,
1024 isi->p_fb_descriptors,
1025 isi->fb_descriptors_phys);
1026 err_alloc_descriptors:
1027 kfree(isi);
1028 err_alloc_isi:
1029 clk_put(isi->pclk);
1030
1031 return ret;
1032 }
1033
1034 static struct platform_driver atmel_isi_driver = {
1035 .probe = atmel_isi_probe,
1036 .remove = __devexit_p(atmel_isi_remove),
1037 .driver = {
1038 .name = "atmel_isi",
1039 .owner = THIS_MODULE,
1040 },
1041 };
1042
1043 static int __init atmel_isi_init_module(void)
1044 {
1045 return platform_driver_probe(&atmel_isi_driver, &atmel_isi_probe);
1046 }
1047
1048 static void __exit atmel_isi_exit(void)
1049 {
1050 platform_driver_unregister(&atmel_isi_driver);
1051 }
1052 module_init(atmel_isi_init_module);
1053 module_exit(atmel_isi_exit);
1054
1055 MODULE_AUTHOR("Josh Wu <josh.wu@atmel.com>");
1056 MODULE_DESCRIPTION("The V4L2 driver for Atmel Linux");
1057 MODULE_LICENSE("GPL");
1058 MODULE_SUPPORTED_DEVICE("video");
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