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ARM: 7630/1: mmc: mmci: Fixup and cleanup code for DMA handling
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / media / platform / soc_camera / atmel-isi.c
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;
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 size = icd->sizeimage;
275
276 if (!*nbuffers || *nbuffers > MAX_BUFFER_NUM)
277 *nbuffers = MAX_BUFFER_NUM;
278
279 if (size * *nbuffers > VID_LIMIT_BYTES)
280 *nbuffers = VID_LIMIT_BYTES / size;
281
282 *nplanes = 1;
283 sizes[0] = size;
284 alloc_ctxs[0] = isi->alloc_ctx;
285
286 isi->sequence = 0;
287 isi->active = NULL;
288
289 dev_dbg(icd->parent, "%s, count=%d, size=%ld\n", __func__,
290 *nbuffers, size);
291
292 return 0;
293 }
294
295 static int buffer_init(struct vb2_buffer *vb)
296 {
297 struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
298
299 buf->p_dma_desc = NULL;
300 INIT_LIST_HEAD(&buf->list);
301
302 return 0;
303 }
304
305 static int buffer_prepare(struct vb2_buffer *vb)
306 {
307 struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
308 struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
309 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
310 struct atmel_isi *isi = ici->priv;
311 unsigned long size;
312 struct isi_dma_desc *desc;
313
314 size = icd->sizeimage;
315
316 if (vb2_plane_size(vb, 0) < size) {
317 dev_err(icd->parent, "%s data will not fit into plane (%lu < %lu)\n",
318 __func__, vb2_plane_size(vb, 0), size);
319 return -EINVAL;
320 }
321
322 vb2_set_plane_payload(&buf->vb, 0, size);
323
324 if (!buf->p_dma_desc) {
325 if (list_empty(&isi->dma_desc_head)) {
326 dev_err(icd->parent, "Not enough dma descriptors.\n");
327 return -EINVAL;
328 } else {
329 /* Get an available descriptor */
330 desc = list_entry(isi->dma_desc_head.next,
331 struct isi_dma_desc, list);
332 /* Delete the descriptor since now it is used */
333 list_del_init(&desc->list);
334
335 /* Initialize the dma descriptor */
336 desc->p_fbd->fb_address =
337 vb2_dma_contig_plane_dma_addr(vb, 0);
338 desc->p_fbd->next_fbd_address = 0;
339 set_dma_ctrl(desc->p_fbd, ISI_DMA_CTRL_WB);
340
341 buf->p_dma_desc = desc;
342 }
343 }
344 return 0;
345 }
346
347 static void buffer_cleanup(struct vb2_buffer *vb)
348 {
349 struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
350 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
351 struct atmel_isi *isi = ici->priv;
352 struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
353
354 /* This descriptor is available now and we add to head list */
355 if (buf->p_dma_desc)
356 list_add(&buf->p_dma_desc->list, &isi->dma_desc_head);
357 }
358
359 static void start_dma(struct atmel_isi *isi, struct frame_buffer *buffer)
360 {
361 u32 ctrl, cfg1;
362
363 cfg1 = isi_readl(isi, ISI_CFG1);
364 /* Enable irq: cxfr for the codec path, pxfr for the preview path */
365 isi_writel(isi, ISI_INTEN,
366 ISI_SR_CXFR_DONE | ISI_SR_PXFR_DONE);
367
368 /* Check if already in a frame */
369 if (isi_readl(isi, ISI_STATUS) & ISI_CTRL_CDC) {
370 dev_err(isi->icd->parent, "Already in frame handling.\n");
371 return;
372 }
373
374 isi_writel(isi, ISI_DMA_C_DSCR, buffer->p_dma_desc->fbd_phys);
375 isi_writel(isi, ISI_DMA_C_CTRL, ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
376 isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_C_CH);
377
378 /* Enable linked list */
379 cfg1 |= isi->pdata->frate | ISI_CFG1_DISCR;
380
381 /* Enable codec path and ISI */
382 ctrl = ISI_CTRL_CDC | ISI_CTRL_EN;
383 isi_writel(isi, ISI_CTRL, ctrl);
384 isi_writel(isi, ISI_CFG1, cfg1);
385 }
386
387 static void buffer_queue(struct vb2_buffer *vb)
388 {
389 struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
390 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
391 struct atmel_isi *isi = ici->priv;
392 struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
393 unsigned long flags = 0;
394
395 spin_lock_irqsave(&isi->lock, flags);
396 list_add_tail(&buf->list, &isi->video_buffer_list);
397
398 if (isi->active == NULL) {
399 isi->active = buf;
400 if (vb2_is_streaming(vb->vb2_queue))
401 start_dma(isi, buf);
402 }
403 spin_unlock_irqrestore(&isi->lock, flags);
404 }
405
406 static int start_streaming(struct vb2_queue *vq, unsigned int count)
407 {
408 struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
409 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
410 struct atmel_isi *isi = ici->priv;
411
412 u32 sr = 0;
413 int ret;
414
415 spin_lock_irq(&isi->lock);
416 isi->state = ISI_STATE_IDLE;
417 /* Clear any pending SOF interrupt */
418 sr = isi_readl(isi, ISI_STATUS);
419 /* Enable VSYNC interrupt for SOF */
420 isi_writel(isi, ISI_INTEN, ISI_SR_VSYNC);
421 isi_writel(isi, ISI_CTRL, ISI_CTRL_EN);
422 spin_unlock_irq(&isi->lock);
423
424 dev_dbg(icd->parent, "Waiting for SOF\n");
425 ret = wait_event_interruptible(isi->vsync_wq,
426 isi->state != ISI_STATE_IDLE);
427 if (ret)
428 goto err;
429
430 if (isi->state != ISI_STATE_READY) {
431 ret = -EIO;
432 goto err;
433 }
434
435 spin_lock_irq(&isi->lock);
436 isi->state = ISI_STATE_WAIT_SOF;
437 isi_writel(isi, ISI_INTDIS, ISI_SR_VSYNC);
438 if (count)
439 start_dma(isi, isi->active);
440 spin_unlock_irq(&isi->lock);
441
442 return 0;
443 err:
444 isi->active = NULL;
445 isi->sequence = 0;
446 INIT_LIST_HEAD(&isi->video_buffer_list);
447 return ret;
448 }
449
450 /* abort streaming and wait for last buffer */
451 static int stop_streaming(struct vb2_queue *vq)
452 {
453 struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
454 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
455 struct atmel_isi *isi = ici->priv;
456 struct frame_buffer *buf, *node;
457 int ret = 0;
458 unsigned long timeout;
459
460 spin_lock_irq(&isi->lock);
461 isi->active = NULL;
462 /* Release all active buffers */
463 list_for_each_entry_safe(buf, node, &isi->video_buffer_list, list) {
464 list_del_init(&buf->list);
465 vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
466 }
467 spin_unlock_irq(&isi->lock);
468
469 timeout = jiffies + FRAME_INTERVAL_MILLI_SEC * HZ;
470 /* Wait until the end of the current frame. */
471 while ((isi_readl(isi, ISI_STATUS) & ISI_CTRL_CDC) &&
472 time_before(jiffies, timeout))
473 msleep(1);
474
475 if (time_after(jiffies, timeout)) {
476 dev_err(icd->parent,
477 "Timeout waiting for finishing codec request\n");
478 return -ETIMEDOUT;
479 }
480
481 /* Disable interrupts */
482 isi_writel(isi, ISI_INTDIS,
483 ISI_SR_CXFR_DONE | ISI_SR_PXFR_DONE);
484
485 /* Disable ISI and wait for it is done */
486 ret = atmel_isi_wait_status(isi, WAIT_ISI_DISABLE);
487 if (ret < 0)
488 dev_err(icd->parent, "Disable ISI timed out\n");
489
490 return ret;
491 }
492
493 static struct vb2_ops isi_video_qops = {
494 .queue_setup = queue_setup,
495 .buf_init = buffer_init,
496 .buf_prepare = buffer_prepare,
497 .buf_cleanup = buffer_cleanup,
498 .buf_queue = buffer_queue,
499 .start_streaming = start_streaming,
500 .stop_streaming = stop_streaming,
501 .wait_prepare = soc_camera_unlock,
502 .wait_finish = soc_camera_lock,
503 };
504
505 /* ------------------------------------------------------------------
506 SOC camera operations for the device
507 ------------------------------------------------------------------*/
508 static int isi_camera_init_videobuf(struct vb2_queue *q,
509 struct soc_camera_device *icd)
510 {
511 q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
512 q->io_modes = VB2_MMAP;
513 q->drv_priv = icd;
514 q->buf_struct_size = sizeof(struct frame_buffer);
515 q->ops = &isi_video_qops;
516 q->mem_ops = &vb2_dma_contig_memops;
517
518 return vb2_queue_init(q);
519 }
520
521 static int isi_camera_set_fmt(struct soc_camera_device *icd,
522 struct v4l2_format *f)
523 {
524 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
525 struct atmel_isi *isi = ici->priv;
526 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
527 const struct soc_camera_format_xlate *xlate;
528 struct v4l2_pix_format *pix = &f->fmt.pix;
529 struct v4l2_mbus_framefmt mf;
530 int ret;
531
532 xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
533 if (!xlate) {
534 dev_warn(icd->parent, "Format %x not found\n",
535 pix->pixelformat);
536 return -EINVAL;
537 }
538
539 dev_dbg(icd->parent, "Plan to set format %dx%d\n",
540 pix->width, pix->height);
541
542 mf.width = pix->width;
543 mf.height = pix->height;
544 mf.field = pix->field;
545 mf.colorspace = pix->colorspace;
546 mf.code = xlate->code;
547
548 ret = v4l2_subdev_call(sd, video, s_mbus_fmt, &mf);
549 if (ret < 0)
550 return ret;
551
552 if (mf.code != xlate->code)
553 return -EINVAL;
554
555 ret = configure_geometry(isi, pix->width, pix->height, xlate->code);
556 if (ret < 0)
557 return ret;
558
559 pix->width = mf.width;
560 pix->height = mf.height;
561 pix->field = mf.field;
562 pix->colorspace = mf.colorspace;
563 icd->current_fmt = xlate;
564
565 dev_dbg(icd->parent, "Finally set format %dx%d\n",
566 pix->width, pix->height);
567
568 return ret;
569 }
570
571 static int isi_camera_try_fmt(struct soc_camera_device *icd,
572 struct v4l2_format *f)
573 {
574 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
575 const struct soc_camera_format_xlate *xlate;
576 struct v4l2_pix_format *pix = &f->fmt.pix;
577 struct v4l2_mbus_framefmt mf;
578 u32 pixfmt = pix->pixelformat;
579 int ret;
580
581 xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
582 if (pixfmt && !xlate) {
583 dev_warn(icd->parent, "Format %x not found\n", pixfmt);
584 return -EINVAL;
585 }
586
587 /* limit to Atmel ISI hardware capabilities */
588 if (pix->height > MAX_SUPPORT_HEIGHT)
589 pix->height = MAX_SUPPORT_HEIGHT;
590 if (pix->width > MAX_SUPPORT_WIDTH)
591 pix->width = MAX_SUPPORT_WIDTH;
592
593 /* limit to sensor capabilities */
594 mf.width = pix->width;
595 mf.height = pix->height;
596 mf.field = pix->field;
597 mf.colorspace = pix->colorspace;
598 mf.code = xlate->code;
599
600 ret = v4l2_subdev_call(sd, video, try_mbus_fmt, &mf);
601 if (ret < 0)
602 return ret;
603
604 pix->width = mf.width;
605 pix->height = mf.height;
606 pix->colorspace = mf.colorspace;
607
608 switch (mf.field) {
609 case V4L2_FIELD_ANY:
610 pix->field = V4L2_FIELD_NONE;
611 break;
612 case V4L2_FIELD_NONE:
613 break;
614 default:
615 dev_err(icd->parent, "Field type %d unsupported.\n",
616 mf.field);
617 ret = -EINVAL;
618 }
619
620 return ret;
621 }
622
623 static const struct soc_mbus_pixelfmt isi_camera_formats[] = {
624 {
625 .fourcc = V4L2_PIX_FMT_YUYV,
626 .name = "Packed YUV422 16 bit",
627 .bits_per_sample = 8,
628 .packing = SOC_MBUS_PACKING_2X8_PADHI,
629 .order = SOC_MBUS_ORDER_LE,
630 .layout = SOC_MBUS_LAYOUT_PACKED,
631 },
632 };
633
634 /* This will be corrected as we get more formats */
635 static bool isi_camera_packing_supported(const struct soc_mbus_pixelfmt *fmt)
636 {
637 return fmt->packing == SOC_MBUS_PACKING_NONE ||
638 (fmt->bits_per_sample == 8 &&
639 fmt->packing == SOC_MBUS_PACKING_2X8_PADHI) ||
640 (fmt->bits_per_sample > 8 &&
641 fmt->packing == SOC_MBUS_PACKING_EXTEND16);
642 }
643
644 #define ISI_BUS_PARAM (V4L2_MBUS_MASTER | \
645 V4L2_MBUS_HSYNC_ACTIVE_HIGH | \
646 V4L2_MBUS_HSYNC_ACTIVE_LOW | \
647 V4L2_MBUS_VSYNC_ACTIVE_HIGH | \
648 V4L2_MBUS_VSYNC_ACTIVE_LOW | \
649 V4L2_MBUS_PCLK_SAMPLE_RISING | \
650 V4L2_MBUS_PCLK_SAMPLE_FALLING | \
651 V4L2_MBUS_DATA_ACTIVE_HIGH)
652
653 static int isi_camera_try_bus_param(struct soc_camera_device *icd,
654 unsigned char buswidth)
655 {
656 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
657 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
658 struct atmel_isi *isi = ici->priv;
659 struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
660 unsigned long common_flags;
661 int ret;
662
663 ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
664 if (!ret) {
665 common_flags = soc_mbus_config_compatible(&cfg,
666 ISI_BUS_PARAM);
667 if (!common_flags) {
668 dev_warn(icd->parent,
669 "Flags incompatible: camera 0x%x, host 0x%x\n",
670 cfg.flags, ISI_BUS_PARAM);
671 return -EINVAL;
672 }
673 } else if (ret != -ENOIOCTLCMD) {
674 return ret;
675 }
676
677 if ((1 << (buswidth - 1)) & isi->width_flags)
678 return 0;
679 return -EINVAL;
680 }
681
682
683 static int isi_camera_get_formats(struct soc_camera_device *icd,
684 unsigned int idx,
685 struct soc_camera_format_xlate *xlate)
686 {
687 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
688 int formats = 0, ret;
689 /* sensor format */
690 enum v4l2_mbus_pixelcode code;
691 /* soc camera host format */
692 const struct soc_mbus_pixelfmt *fmt;
693
694 ret = v4l2_subdev_call(sd, video, enum_mbus_fmt, idx, &code);
695 if (ret < 0)
696 /* No more formats */
697 return 0;
698
699 fmt = soc_mbus_get_fmtdesc(code);
700 if (!fmt) {
701 dev_err(icd->parent,
702 "Invalid format code #%u: %d\n", idx, code);
703 return 0;
704 }
705
706 /* This also checks support for the requested bits-per-sample */
707 ret = isi_camera_try_bus_param(icd, fmt->bits_per_sample);
708 if (ret < 0) {
709 dev_err(icd->parent,
710 "Fail to try the bus parameters.\n");
711 return 0;
712 }
713
714 switch (code) {
715 case V4L2_MBUS_FMT_UYVY8_2X8:
716 case V4L2_MBUS_FMT_VYUY8_2X8:
717 case V4L2_MBUS_FMT_YUYV8_2X8:
718 case V4L2_MBUS_FMT_YVYU8_2X8:
719 formats++;
720 if (xlate) {
721 xlate->host_fmt = &isi_camera_formats[0];
722 xlate->code = code;
723 xlate++;
724 dev_dbg(icd->parent, "Providing format %s using code %d\n",
725 isi_camera_formats[0].name, code);
726 }
727 break;
728 default:
729 if (!isi_camera_packing_supported(fmt))
730 return 0;
731 if (xlate)
732 dev_dbg(icd->parent,
733 "Providing format %s in pass-through mode\n",
734 fmt->name);
735 }
736
737 /* Generic pass-through */
738 formats++;
739 if (xlate) {
740 xlate->host_fmt = fmt;
741 xlate->code = code;
742 xlate++;
743 }
744
745 return formats;
746 }
747
748 /* Called with .video_lock held */
749 static int isi_camera_add_device(struct soc_camera_device *icd)
750 {
751 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
752 struct atmel_isi *isi = ici->priv;
753 int ret;
754
755 if (isi->icd)
756 return -EBUSY;
757
758 ret = clk_enable(isi->pclk);
759 if (ret)
760 return ret;
761
762 ret = clk_enable(isi->mck);
763 if (ret) {
764 clk_disable(isi->pclk);
765 return ret;
766 }
767
768 isi->icd = icd;
769 dev_dbg(icd->parent, "Atmel ISI Camera driver attached to camera %d\n",
770 icd->devnum);
771 return 0;
772 }
773 /* Called with .video_lock held */
774 static void isi_camera_remove_device(struct soc_camera_device *icd)
775 {
776 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
777 struct atmel_isi *isi = ici->priv;
778
779 BUG_ON(icd != isi->icd);
780
781 clk_disable(isi->mck);
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)
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->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_unprepare(isi->mck);
916 clk_put(isi->mck);
917 clk_unprepare(isi->pclk);
918 clk_put(isi->pclk);
919 kfree(isi);
920
921 return 0;
922 }
923
924 static int __devinit atmel_isi_probe(struct platform_device *pdev)
925 {
926 unsigned int irq;
927 struct atmel_isi *isi;
928 struct clk *pclk;
929 struct resource *regs;
930 int ret, i;
931 struct device *dev = &pdev->dev;
932 struct soc_camera_host *soc_host;
933 struct isi_platform_data *pdata;
934
935 pdata = dev->platform_data;
936 if (!pdata || !pdata->data_width_flags || !pdata->mck_hz) {
937 dev_err(&pdev->dev,
938 "No config available for Atmel ISI\n");
939 return -EINVAL;
940 }
941
942 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
943 if (!regs)
944 return -ENXIO;
945
946 pclk = clk_get(&pdev->dev, "isi_clk");
947 if (IS_ERR(pclk))
948 return PTR_ERR(pclk);
949
950 ret = clk_prepare(pclk);
951 if (ret)
952 goto err_clk_prepare_pclk;
953
954 isi = kzalloc(sizeof(struct atmel_isi), GFP_KERNEL);
955 if (!isi) {
956 ret = -ENOMEM;
957 dev_err(&pdev->dev, "Can't allocate interface!\n");
958 goto err_alloc_isi;
959 }
960
961 isi->pclk = pclk;
962 isi->pdata = pdata;
963 isi->active = NULL;
964 spin_lock_init(&isi->lock);
965 init_waitqueue_head(&isi->vsync_wq);
966 INIT_LIST_HEAD(&isi->video_buffer_list);
967 INIT_LIST_HEAD(&isi->dma_desc_head);
968
969 /* Get ISI_MCK, provided by programmable clock or external clock */
970 isi->mck = clk_get(dev, "isi_mck");
971 if (IS_ERR(isi->mck)) {
972 dev_err(dev, "Failed to get isi_mck\n");
973 ret = PTR_ERR(isi->mck);
974 goto err_clk_get;
975 }
976
977 ret = clk_prepare(isi->mck);
978 if (ret)
979 goto err_clk_prepare_mck;
980
981 /* Set ISI_MCK's frequency, it should be faster than pixel clock */
982 ret = clk_set_rate(isi->mck, pdata->mck_hz);
983 if (ret < 0)
984 goto err_set_mck_rate;
985
986 isi->p_fb_descriptors = dma_alloc_coherent(&pdev->dev,
987 sizeof(struct fbd) * MAX_BUFFER_NUM,
988 &isi->fb_descriptors_phys,
989 GFP_KERNEL);
990 if (!isi->p_fb_descriptors) {
991 ret = -ENOMEM;
992 dev_err(&pdev->dev, "Can't allocate descriptors!\n");
993 goto err_alloc_descriptors;
994 }
995
996 for (i = 0; i < MAX_BUFFER_NUM; i++) {
997 isi->dma_desc[i].p_fbd = isi->p_fb_descriptors + i;
998 isi->dma_desc[i].fbd_phys = isi->fb_descriptors_phys +
999 i * sizeof(struct fbd);
1000 list_add(&isi->dma_desc[i].list, &isi->dma_desc_head);
1001 }
1002
1003 isi->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
1004 if (IS_ERR(isi->alloc_ctx)) {
1005 ret = PTR_ERR(isi->alloc_ctx);
1006 goto err_alloc_ctx;
1007 }
1008
1009 isi->regs = ioremap(regs->start, resource_size(regs));
1010 if (!isi->regs) {
1011 ret = -ENOMEM;
1012 goto err_ioremap;
1013 }
1014
1015 if (pdata->data_width_flags & ISI_DATAWIDTH_8)
1016 isi->width_flags = 1 << 7;
1017 if (pdata->data_width_flags & ISI_DATAWIDTH_10)
1018 isi->width_flags |= 1 << 9;
1019
1020 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
1021
1022 irq = platform_get_irq(pdev, 0);
1023 if (irq < 0) {
1024 ret = irq;
1025 goto err_req_irq;
1026 }
1027
1028 ret = request_irq(irq, isi_interrupt, 0, "isi", isi);
1029 if (ret) {
1030 dev_err(&pdev->dev, "Unable to request irq %d\n", irq);
1031 goto err_req_irq;
1032 }
1033 isi->irq = irq;
1034
1035 soc_host = &isi->soc_host;
1036 soc_host->drv_name = "isi-camera";
1037 soc_host->ops = &isi_soc_camera_host_ops;
1038 soc_host->priv = isi;
1039 soc_host->v4l2_dev.dev = &pdev->dev;
1040 soc_host->nr = pdev->id;
1041
1042 ret = soc_camera_host_register(soc_host);
1043 if (ret) {
1044 dev_err(&pdev->dev, "Unable to register soc camera host\n");
1045 goto err_register_soc_camera_host;
1046 }
1047 return 0;
1048
1049 err_register_soc_camera_host:
1050 free_irq(isi->irq, isi);
1051 err_req_irq:
1052 iounmap(isi->regs);
1053 err_ioremap:
1054 vb2_dma_contig_cleanup_ctx(isi->alloc_ctx);
1055 err_alloc_ctx:
1056 dma_free_coherent(&pdev->dev,
1057 sizeof(struct fbd) * MAX_BUFFER_NUM,
1058 isi->p_fb_descriptors,
1059 isi->fb_descriptors_phys);
1060 err_alloc_descriptors:
1061 err_set_mck_rate:
1062 clk_unprepare(isi->mck);
1063 err_clk_prepare_mck:
1064 clk_put(isi->mck);
1065 err_clk_get:
1066 kfree(isi);
1067 err_alloc_isi:
1068 clk_unprepare(pclk);
1069 err_clk_prepare_pclk:
1070 clk_put(pclk);
1071
1072 return ret;
1073 }
1074
1075 static struct platform_driver atmel_isi_driver = {
1076 .probe = atmel_isi_probe,
1077 .remove = __devexit_p(atmel_isi_remove),
1078 .driver = {
1079 .name = "atmel_isi",
1080 .owner = THIS_MODULE,
1081 },
1082 };
1083
1084 static int __init atmel_isi_init_module(void)
1085 {
1086 return platform_driver_probe(&atmel_isi_driver, &atmel_isi_probe);
1087 }
1088
1089 static void __exit atmel_isi_exit(void)
1090 {
1091 platform_driver_unregister(&atmel_isi_driver);
1092 }
1093 module_init(atmel_isi_init_module);
1094 module_exit(atmel_isi_exit);
1095
1096 MODULE_AUTHOR("Josh Wu <josh.wu@atmel.com>");
1097 MODULE_DESCRIPTION("The V4L2 driver for Atmel Linux");
1098 MODULE_LICENSE("GPL");
1099 MODULE_SUPPORTED_DEVICE("video");
kernel source for telekom puls (alcatel/mediatek)