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