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Merge tag 'sound-fix-3.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai...
[deliverable/linux.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/v4l2-of.h>
29 #include <media/videobuf2-dma-contig.h>
30
31 #define MAX_BUFFER_NUM 32
32 #define MAX_SUPPORT_WIDTH 2048
33 #define MAX_SUPPORT_HEIGHT 2048
34 #define VID_LIMIT_BYTES (16 * 1024 * 1024)
35 #define MIN_FRAME_RATE 15
36 #define FRAME_INTERVAL_MILLI_SEC (1000 / MIN_FRAME_RATE)
37 #define ISI_DEFAULT_MCLK_FREQ 25000000
38
39 /* Frame buffer descriptor */
40 struct fbd {
41 /* Physical address of the frame buffer */
42 u32 fb_address;
43 /* DMA Control Register(only in HISI2) */
44 u32 dma_ctrl;
45 /* Physical address of the next fbd */
46 u32 next_fbd_address;
47 };
48
49 static void set_dma_ctrl(struct fbd *fb_desc, u32 ctrl)
50 {
51 fb_desc->dma_ctrl = ctrl;
52 }
53
54 struct isi_dma_desc {
55 struct list_head list;
56 struct fbd *p_fbd;
57 dma_addr_t fbd_phys;
58 };
59
60 /* Frame buffer data */
61 struct frame_buffer {
62 struct vb2_buffer vb;
63 struct isi_dma_desc *p_dma_desc;
64 struct list_head list;
65 };
66
67 struct atmel_isi {
68 /* Protects the access of variables shared with the ISR */
69 spinlock_t lock;
70 void __iomem *regs;
71
72 int sequence;
73
74 struct vb2_alloc_ctx *alloc_ctx;
75
76 /* Allocate descriptors for dma buffer use */
77 struct fbd *p_fb_descriptors;
78 dma_addr_t fb_descriptors_phys;
79 struct list_head dma_desc_head;
80 struct isi_dma_desc dma_desc[MAX_BUFFER_NUM];
81
82 struct completion complete;
83 /* ISI peripherial clock */
84 struct clk *pclk;
85 /* ISI_MCK, feed to camera sensor to generate pixel clock */
86 struct clk *mck;
87 unsigned int irq;
88
89 struct isi_platform_data pdata;
90 u16 width_flags; /* max 12 bits */
91
92 struct list_head video_buffer_list;
93 struct frame_buffer *active;
94
95 struct soc_camera_host soc_host;
96 };
97
98 static void isi_writel(struct atmel_isi *isi, u32 reg, u32 val)
99 {
100 writel(val, isi->regs + reg);
101 }
102 static u32 isi_readl(struct atmel_isi *isi, u32 reg)
103 {
104 return readl(isi->regs + reg);
105 }
106
107 static int configure_geometry(struct atmel_isi *isi, u32 width,
108 u32 height, enum v4l2_mbus_pixelcode code)
109 {
110 u32 cfg2, cr;
111
112 switch (code) {
113 /* YUV, including grey */
114 case V4L2_MBUS_FMT_Y8_1X8:
115 cr = ISI_CFG2_GRAYSCALE;
116 break;
117 case V4L2_MBUS_FMT_VYUY8_2X8:
118 cr = ISI_CFG2_YCC_SWAP_MODE_3;
119 break;
120 case V4L2_MBUS_FMT_UYVY8_2X8:
121 cr = ISI_CFG2_YCC_SWAP_MODE_2;
122 break;
123 case V4L2_MBUS_FMT_YVYU8_2X8:
124 cr = ISI_CFG2_YCC_SWAP_MODE_1;
125 break;
126 case V4L2_MBUS_FMT_YUYV8_2X8:
127 cr = ISI_CFG2_YCC_SWAP_DEFAULT;
128 break;
129 /* RGB, TODO */
130 default:
131 return -EINVAL;
132 }
133
134 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
135
136 cfg2 = isi_readl(isi, ISI_CFG2);
137 /* Set YCC swap mode */
138 cfg2 &= ~ISI_CFG2_YCC_SWAP_MODE_MASK;
139 cfg2 |= cr;
140 /* Set width */
141 cfg2 &= ~(ISI_CFG2_IM_HSIZE_MASK);
142 cfg2 |= ((width - 1) << ISI_CFG2_IM_HSIZE_OFFSET) &
143 ISI_CFG2_IM_HSIZE_MASK;
144 /* Set height */
145 cfg2 &= ~(ISI_CFG2_IM_VSIZE_MASK);
146 cfg2 |= ((height - 1) << ISI_CFG2_IM_VSIZE_OFFSET)
147 & ISI_CFG2_IM_VSIZE_MASK;
148 isi_writel(isi, ISI_CFG2, cfg2);
149
150 return 0;
151 }
152
153 static irqreturn_t atmel_isi_handle_streaming(struct atmel_isi *isi)
154 {
155 if (isi->active) {
156 struct vb2_buffer *vb = &isi->active->vb;
157 struct frame_buffer *buf = isi->active;
158
159 list_del_init(&buf->list);
160 v4l2_get_timestamp(&vb->v4l2_buf.timestamp);
161 vb->v4l2_buf.sequence = isi->sequence++;
162 vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
163 }
164
165 if (list_empty(&isi->video_buffer_list)) {
166 isi->active = NULL;
167 } else {
168 /* start next dma frame. */
169 isi->active = list_entry(isi->video_buffer_list.next,
170 struct frame_buffer, list);
171 isi_writel(isi, ISI_DMA_C_DSCR,
172 (u32)isi->active->p_dma_desc->fbd_phys);
173 isi_writel(isi, ISI_DMA_C_CTRL,
174 ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
175 isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_C_CH);
176 }
177 return IRQ_HANDLED;
178 }
179
180 /* ISI interrupt service routine */
181 static irqreturn_t isi_interrupt(int irq, void *dev_id)
182 {
183 struct atmel_isi *isi = dev_id;
184 u32 status, mask, pending;
185 irqreturn_t ret = IRQ_NONE;
186
187 spin_lock(&isi->lock);
188
189 status = isi_readl(isi, ISI_STATUS);
190 mask = isi_readl(isi, ISI_INTMASK);
191 pending = status & mask;
192
193 if (pending & ISI_CTRL_SRST) {
194 complete(&isi->complete);
195 isi_writel(isi, ISI_INTDIS, ISI_CTRL_SRST);
196 ret = IRQ_HANDLED;
197 } else if (pending & ISI_CTRL_DIS) {
198 complete(&isi->complete);
199 isi_writel(isi, ISI_INTDIS, ISI_CTRL_DIS);
200 ret = IRQ_HANDLED;
201 } else {
202 if (likely(pending & ISI_SR_CXFR_DONE))
203 ret = atmel_isi_handle_streaming(isi);
204 }
205
206 spin_unlock(&isi->lock);
207 return ret;
208 }
209
210 #define WAIT_ISI_RESET 1
211 #define WAIT_ISI_DISABLE 0
212 static int atmel_isi_wait_status(struct atmel_isi *isi, int wait_reset)
213 {
214 unsigned long timeout;
215 /*
216 * The reset or disable will only succeed if we have a
217 * pixel clock from the camera.
218 */
219 init_completion(&isi->complete);
220
221 if (wait_reset) {
222 isi_writel(isi, ISI_INTEN, ISI_CTRL_SRST);
223 isi_writel(isi, ISI_CTRL, ISI_CTRL_SRST);
224 } else {
225 isi_writel(isi, ISI_INTEN, ISI_CTRL_DIS);
226 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
227 }
228
229 timeout = wait_for_completion_timeout(&isi->complete,
230 msecs_to_jiffies(100));
231 if (timeout == 0)
232 return -ETIMEDOUT;
233
234 return 0;
235 }
236
237 /* ------------------------------------------------------------------
238 Videobuf operations
239 ------------------------------------------------------------------*/
240 static int queue_setup(struct vb2_queue *vq, const struct v4l2_format *fmt,
241 unsigned int *nbuffers, unsigned int *nplanes,
242 unsigned int sizes[], void *alloc_ctxs[])
243 {
244 struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
245 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
246 struct atmel_isi *isi = ici->priv;
247 unsigned long size;
248
249 size = icd->sizeimage;
250
251 if (!*nbuffers || *nbuffers > MAX_BUFFER_NUM)
252 *nbuffers = MAX_BUFFER_NUM;
253
254 if (size * *nbuffers > VID_LIMIT_BYTES)
255 *nbuffers = VID_LIMIT_BYTES / size;
256
257 *nplanes = 1;
258 sizes[0] = size;
259 alloc_ctxs[0] = isi->alloc_ctx;
260
261 isi->sequence = 0;
262 isi->active = NULL;
263
264 dev_dbg(icd->parent, "%s, count=%d, size=%ld\n", __func__,
265 *nbuffers, size);
266
267 return 0;
268 }
269
270 static int buffer_init(struct vb2_buffer *vb)
271 {
272 struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
273
274 buf->p_dma_desc = NULL;
275 INIT_LIST_HEAD(&buf->list);
276
277 return 0;
278 }
279
280 static int buffer_prepare(struct vb2_buffer *vb)
281 {
282 struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
283 struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
284 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
285 struct atmel_isi *isi = ici->priv;
286 unsigned long size;
287 struct isi_dma_desc *desc;
288
289 size = icd->sizeimage;
290
291 if (vb2_plane_size(vb, 0) < size) {
292 dev_err(icd->parent, "%s data will not fit into plane (%lu < %lu)\n",
293 __func__, vb2_plane_size(vb, 0), size);
294 return -EINVAL;
295 }
296
297 vb2_set_plane_payload(&buf->vb, 0, size);
298
299 if (!buf->p_dma_desc) {
300 if (list_empty(&isi->dma_desc_head)) {
301 dev_err(icd->parent, "Not enough dma descriptors.\n");
302 return -EINVAL;
303 } else {
304 /* Get an available descriptor */
305 desc = list_entry(isi->dma_desc_head.next,
306 struct isi_dma_desc, list);
307 /* Delete the descriptor since now it is used */
308 list_del_init(&desc->list);
309
310 /* Initialize the dma descriptor */
311 desc->p_fbd->fb_address =
312 vb2_dma_contig_plane_dma_addr(vb, 0);
313 desc->p_fbd->next_fbd_address = 0;
314 set_dma_ctrl(desc->p_fbd, ISI_DMA_CTRL_WB);
315
316 buf->p_dma_desc = desc;
317 }
318 }
319 return 0;
320 }
321
322 static void buffer_cleanup(struct vb2_buffer *vb)
323 {
324 struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
325 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
326 struct atmel_isi *isi = ici->priv;
327 struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
328
329 /* This descriptor is available now and we add to head list */
330 if (buf->p_dma_desc)
331 list_add(&buf->p_dma_desc->list, &isi->dma_desc_head);
332 }
333
334 static void start_dma(struct atmel_isi *isi, struct frame_buffer *buffer)
335 {
336 u32 ctrl, cfg1;
337
338 cfg1 = isi_readl(isi, ISI_CFG1);
339 /* Enable irq: cxfr for the codec path, pxfr for the preview path */
340 isi_writel(isi, ISI_INTEN,
341 ISI_SR_CXFR_DONE | ISI_SR_PXFR_DONE);
342
343 /* Check if already in a frame */
344 if (isi_readl(isi, ISI_STATUS) & ISI_CTRL_CDC) {
345 dev_err(isi->soc_host.icd->parent, "Already in frame handling.\n");
346 return;
347 }
348
349 isi_writel(isi, ISI_DMA_C_DSCR, (u32)buffer->p_dma_desc->fbd_phys);
350 isi_writel(isi, ISI_DMA_C_CTRL, ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
351 isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_C_CH);
352
353 cfg1 &= ~ISI_CFG1_FRATE_DIV_MASK;
354 /* Enable linked list */
355 cfg1 |= isi->pdata.frate | ISI_CFG1_DISCR;
356
357 /* Enable codec path and ISI */
358 ctrl = ISI_CTRL_CDC | ISI_CTRL_EN;
359 isi_writel(isi, ISI_CTRL, ctrl);
360 isi_writel(isi, ISI_CFG1, cfg1);
361 }
362
363 static void buffer_queue(struct vb2_buffer *vb)
364 {
365 struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
366 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
367 struct atmel_isi *isi = ici->priv;
368 struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
369 unsigned long flags = 0;
370
371 spin_lock_irqsave(&isi->lock, flags);
372 list_add_tail(&buf->list, &isi->video_buffer_list);
373
374 if (isi->active == NULL) {
375 isi->active = buf;
376 if (vb2_is_streaming(vb->vb2_queue))
377 start_dma(isi, buf);
378 }
379 spin_unlock_irqrestore(&isi->lock, flags);
380 }
381
382 static int start_streaming(struct vb2_queue *vq, unsigned int count)
383 {
384 struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
385 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
386 struct atmel_isi *isi = ici->priv;
387 int ret;
388
389 /* Reset ISI */
390 ret = atmel_isi_wait_status(isi, WAIT_ISI_RESET);
391 if (ret < 0) {
392 dev_err(icd->parent, "Reset ISI timed out\n");
393 return ret;
394 }
395 /* Disable all interrupts */
396 isi_writel(isi, ISI_INTDIS, (u32)~0UL);
397
398 spin_lock_irq(&isi->lock);
399 /* Clear any pending interrupt */
400 isi_readl(isi, ISI_STATUS);
401
402 if (count)
403 start_dma(isi, isi->active);
404 spin_unlock_irq(&isi->lock);
405
406 return 0;
407 }
408
409 /* abort streaming and wait for last buffer */
410 static void stop_streaming(struct vb2_queue *vq)
411 {
412 struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
413 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
414 struct atmel_isi *isi = ici->priv;
415 struct frame_buffer *buf, *node;
416 int ret = 0;
417 unsigned long timeout;
418
419 spin_lock_irq(&isi->lock);
420 isi->active = NULL;
421 /* Release all active buffers */
422 list_for_each_entry_safe(buf, node, &isi->video_buffer_list, list) {
423 list_del_init(&buf->list);
424 vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
425 }
426 spin_unlock_irq(&isi->lock);
427
428 timeout = jiffies + FRAME_INTERVAL_MILLI_SEC * HZ;
429 /* Wait until the end of the current frame. */
430 while ((isi_readl(isi, ISI_STATUS) & ISI_CTRL_CDC) &&
431 time_before(jiffies, timeout))
432 msleep(1);
433
434 if (time_after(jiffies, timeout)) {
435 dev_err(icd->parent,
436 "Timeout waiting for finishing codec request\n");
437 return;
438 }
439
440 /* Disable interrupts */
441 isi_writel(isi, ISI_INTDIS,
442 ISI_SR_CXFR_DONE | ISI_SR_PXFR_DONE);
443
444 /* Disable ISI and wait for it is done */
445 ret = atmel_isi_wait_status(isi, WAIT_ISI_DISABLE);
446 if (ret < 0)
447 dev_err(icd->parent, "Disable ISI timed out\n");
448 }
449
450 static struct vb2_ops isi_video_qops = {
451 .queue_setup = queue_setup,
452 .buf_init = buffer_init,
453 .buf_prepare = buffer_prepare,
454 .buf_cleanup = buffer_cleanup,
455 .buf_queue = buffer_queue,
456 .start_streaming = start_streaming,
457 .stop_streaming = stop_streaming,
458 .wait_prepare = soc_camera_unlock,
459 .wait_finish = soc_camera_lock,
460 };
461
462 /* ------------------------------------------------------------------
463 SOC camera operations for the device
464 ------------------------------------------------------------------*/
465 static int isi_camera_init_videobuf(struct vb2_queue *q,
466 struct soc_camera_device *icd)
467 {
468 q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
469 q->io_modes = VB2_MMAP;
470 q->drv_priv = icd;
471 q->buf_struct_size = sizeof(struct frame_buffer);
472 q->ops = &isi_video_qops;
473 q->mem_ops = &vb2_dma_contig_memops;
474 q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
475
476 return vb2_queue_init(q);
477 }
478
479 static int isi_camera_set_fmt(struct soc_camera_device *icd,
480 struct v4l2_format *f)
481 {
482 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
483 struct atmel_isi *isi = ici->priv;
484 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
485 const struct soc_camera_format_xlate *xlate;
486 struct v4l2_pix_format *pix = &f->fmt.pix;
487 struct v4l2_mbus_framefmt mf;
488 int ret;
489
490 xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
491 if (!xlate) {
492 dev_warn(icd->parent, "Format %x not found\n",
493 pix->pixelformat);
494 return -EINVAL;
495 }
496
497 dev_dbg(icd->parent, "Plan to set format %dx%d\n",
498 pix->width, pix->height);
499
500 mf.width = pix->width;
501 mf.height = pix->height;
502 mf.field = pix->field;
503 mf.colorspace = pix->colorspace;
504 mf.code = xlate->code;
505
506 ret = v4l2_subdev_call(sd, video, s_mbus_fmt, &mf);
507 if (ret < 0)
508 return ret;
509
510 if (mf.code != xlate->code)
511 return -EINVAL;
512
513 ret = configure_geometry(isi, pix->width, pix->height, xlate->code);
514 if (ret < 0)
515 return ret;
516
517 pix->width = mf.width;
518 pix->height = mf.height;
519 pix->field = mf.field;
520 pix->colorspace = mf.colorspace;
521 icd->current_fmt = xlate;
522
523 dev_dbg(icd->parent, "Finally set format %dx%d\n",
524 pix->width, pix->height);
525
526 return ret;
527 }
528
529 static int isi_camera_try_fmt(struct soc_camera_device *icd,
530 struct v4l2_format *f)
531 {
532 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
533 const struct soc_camera_format_xlate *xlate;
534 struct v4l2_pix_format *pix = &f->fmt.pix;
535 struct v4l2_mbus_framefmt mf;
536 u32 pixfmt = pix->pixelformat;
537 int ret;
538
539 xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
540 if (pixfmt && !xlate) {
541 dev_warn(icd->parent, "Format %x not found\n", pixfmt);
542 return -EINVAL;
543 }
544
545 /* limit to Atmel ISI hardware capabilities */
546 if (pix->height > MAX_SUPPORT_HEIGHT)
547 pix->height = MAX_SUPPORT_HEIGHT;
548 if (pix->width > MAX_SUPPORT_WIDTH)
549 pix->width = MAX_SUPPORT_WIDTH;
550
551 /* limit to sensor capabilities */
552 mf.width = pix->width;
553 mf.height = pix->height;
554 mf.field = pix->field;
555 mf.colorspace = pix->colorspace;
556 mf.code = xlate->code;
557
558 ret = v4l2_subdev_call(sd, video, try_mbus_fmt, &mf);
559 if (ret < 0)
560 return ret;
561
562 pix->width = mf.width;
563 pix->height = mf.height;
564 pix->colorspace = mf.colorspace;
565
566 switch (mf.field) {
567 case V4L2_FIELD_ANY:
568 pix->field = V4L2_FIELD_NONE;
569 break;
570 case V4L2_FIELD_NONE:
571 break;
572 default:
573 dev_err(icd->parent, "Field type %d unsupported.\n",
574 mf.field);
575 ret = -EINVAL;
576 }
577
578 return ret;
579 }
580
581 static const struct soc_mbus_pixelfmt isi_camera_formats[] = {
582 {
583 .fourcc = V4L2_PIX_FMT_YUYV,
584 .name = "Packed YUV422 16 bit",
585 .bits_per_sample = 8,
586 .packing = SOC_MBUS_PACKING_2X8_PADHI,
587 .order = SOC_MBUS_ORDER_LE,
588 .layout = SOC_MBUS_LAYOUT_PACKED,
589 },
590 };
591
592 /* This will be corrected as we get more formats */
593 static bool isi_camera_packing_supported(const struct soc_mbus_pixelfmt *fmt)
594 {
595 return fmt->packing == SOC_MBUS_PACKING_NONE ||
596 (fmt->bits_per_sample == 8 &&
597 fmt->packing == SOC_MBUS_PACKING_2X8_PADHI) ||
598 (fmt->bits_per_sample > 8 &&
599 fmt->packing == SOC_MBUS_PACKING_EXTEND16);
600 }
601
602 #define ISI_BUS_PARAM (V4L2_MBUS_MASTER | \
603 V4L2_MBUS_HSYNC_ACTIVE_HIGH | \
604 V4L2_MBUS_HSYNC_ACTIVE_LOW | \
605 V4L2_MBUS_VSYNC_ACTIVE_HIGH | \
606 V4L2_MBUS_VSYNC_ACTIVE_LOW | \
607 V4L2_MBUS_PCLK_SAMPLE_RISING | \
608 V4L2_MBUS_PCLK_SAMPLE_FALLING | \
609 V4L2_MBUS_DATA_ACTIVE_HIGH)
610
611 static int isi_camera_try_bus_param(struct soc_camera_device *icd,
612 unsigned char buswidth)
613 {
614 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
615 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
616 struct atmel_isi *isi = ici->priv;
617 struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
618 unsigned long common_flags;
619 int ret;
620
621 ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
622 if (!ret) {
623 common_flags = soc_mbus_config_compatible(&cfg,
624 ISI_BUS_PARAM);
625 if (!common_flags) {
626 dev_warn(icd->parent,
627 "Flags incompatible: camera 0x%x, host 0x%x\n",
628 cfg.flags, ISI_BUS_PARAM);
629 return -EINVAL;
630 }
631 } else if (ret != -ENOIOCTLCMD) {
632 return ret;
633 }
634
635 if ((1 << (buswidth - 1)) & isi->width_flags)
636 return 0;
637 return -EINVAL;
638 }
639
640
641 static int isi_camera_get_formats(struct soc_camera_device *icd,
642 unsigned int idx,
643 struct soc_camera_format_xlate *xlate)
644 {
645 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
646 int formats = 0, ret;
647 /* sensor format */
648 enum v4l2_mbus_pixelcode code;
649 /* soc camera host format */
650 const struct soc_mbus_pixelfmt *fmt;
651
652 ret = v4l2_subdev_call(sd, video, enum_mbus_fmt, idx, &code);
653 if (ret < 0)
654 /* No more formats */
655 return 0;
656
657 fmt = soc_mbus_get_fmtdesc(code);
658 if (!fmt) {
659 dev_err(icd->parent,
660 "Invalid format code #%u: %d\n", idx, code);
661 return 0;
662 }
663
664 /* This also checks support for the requested bits-per-sample */
665 ret = isi_camera_try_bus_param(icd, fmt->bits_per_sample);
666 if (ret < 0) {
667 dev_err(icd->parent,
668 "Fail to try the bus parameters.\n");
669 return 0;
670 }
671
672 switch (code) {
673 case V4L2_MBUS_FMT_UYVY8_2X8:
674 case V4L2_MBUS_FMT_VYUY8_2X8:
675 case V4L2_MBUS_FMT_YUYV8_2X8:
676 case V4L2_MBUS_FMT_YVYU8_2X8:
677 formats++;
678 if (xlate) {
679 xlate->host_fmt = &isi_camera_formats[0];
680 xlate->code = code;
681 xlate++;
682 dev_dbg(icd->parent, "Providing format %s using code %d\n",
683 isi_camera_formats[0].name, code);
684 }
685 break;
686 default:
687 if (!isi_camera_packing_supported(fmt))
688 return 0;
689 if (xlate)
690 dev_dbg(icd->parent,
691 "Providing format %s in pass-through mode\n",
692 fmt->name);
693 }
694
695 /* Generic pass-through */
696 formats++;
697 if (xlate) {
698 xlate->host_fmt = fmt;
699 xlate->code = code;
700 xlate++;
701 }
702
703 return formats;
704 }
705
706 static int isi_camera_add_device(struct soc_camera_device *icd)
707 {
708 dev_dbg(icd->parent, "Atmel ISI Camera driver attached to camera %d\n",
709 icd->devnum);
710
711 return 0;
712 }
713
714 static void isi_camera_remove_device(struct soc_camera_device *icd)
715 {
716 dev_dbg(icd->parent, "Atmel ISI Camera driver detached from camera %d\n",
717 icd->devnum);
718 }
719
720 /* Called with .host_lock held */
721 static int isi_camera_clock_start(struct soc_camera_host *ici)
722 {
723 struct atmel_isi *isi = ici->priv;
724 int ret;
725
726 ret = clk_prepare_enable(isi->pclk);
727 if (ret)
728 return ret;
729
730 if (!IS_ERR(isi->mck)) {
731 ret = clk_prepare_enable(isi->mck);
732 if (ret) {
733 clk_disable_unprepare(isi->pclk);
734 return ret;
735 }
736 }
737
738 return 0;
739 }
740
741 /* Called with .host_lock held */
742 static void isi_camera_clock_stop(struct soc_camera_host *ici)
743 {
744 struct atmel_isi *isi = ici->priv;
745
746 if (!IS_ERR(isi->mck))
747 clk_disable_unprepare(isi->mck);
748 clk_disable_unprepare(isi->pclk);
749 }
750
751 static unsigned int isi_camera_poll(struct file *file, poll_table *pt)
752 {
753 struct soc_camera_device *icd = file->private_data;
754
755 return vb2_poll(&icd->vb2_vidq, file, pt);
756 }
757
758 static int isi_camera_querycap(struct soc_camera_host *ici,
759 struct v4l2_capability *cap)
760 {
761 strcpy(cap->driver, "atmel-isi");
762 strcpy(cap->card, "Atmel Image Sensor Interface");
763 cap->capabilities = (V4L2_CAP_VIDEO_CAPTURE |
764 V4L2_CAP_STREAMING);
765 return 0;
766 }
767
768 static int isi_camera_set_bus_param(struct soc_camera_device *icd)
769 {
770 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
771 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
772 struct atmel_isi *isi = ici->priv;
773 struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
774 unsigned long common_flags;
775 int ret;
776 u32 cfg1 = 0;
777
778 ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
779 if (!ret) {
780 common_flags = soc_mbus_config_compatible(&cfg,
781 ISI_BUS_PARAM);
782 if (!common_flags) {
783 dev_warn(icd->parent,
784 "Flags incompatible: camera 0x%x, host 0x%x\n",
785 cfg.flags, ISI_BUS_PARAM);
786 return -EINVAL;
787 }
788 } else if (ret != -ENOIOCTLCMD) {
789 return ret;
790 } else {
791 common_flags = ISI_BUS_PARAM;
792 }
793 dev_dbg(icd->parent, "Flags cam: 0x%x host: 0x%x common: 0x%lx\n",
794 cfg.flags, ISI_BUS_PARAM, common_flags);
795
796 /* Make choises, based on platform preferences */
797 if ((common_flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH) &&
798 (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)) {
799 if (isi->pdata.hsync_act_low)
800 common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_HIGH;
801 else
802 common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_LOW;
803 }
804
805 if ((common_flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH) &&
806 (common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)) {
807 if (isi->pdata.vsync_act_low)
808 common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_HIGH;
809 else
810 common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_LOW;
811 }
812
813 if ((common_flags & V4L2_MBUS_PCLK_SAMPLE_RISING) &&
814 (common_flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)) {
815 if (isi->pdata.pclk_act_falling)
816 common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_RISING;
817 else
818 common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_FALLING;
819 }
820
821 cfg.flags = common_flags;
822 ret = v4l2_subdev_call(sd, video, s_mbus_config, &cfg);
823 if (ret < 0 && ret != -ENOIOCTLCMD) {
824 dev_dbg(icd->parent, "camera s_mbus_config(0x%lx) returned %d\n",
825 common_flags, ret);
826 return ret;
827 }
828
829 /* set bus param for ISI */
830 if (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)
831 cfg1 |= ISI_CFG1_HSYNC_POL_ACTIVE_LOW;
832 if (common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
833 cfg1 |= ISI_CFG1_VSYNC_POL_ACTIVE_LOW;
834 if (common_flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)
835 cfg1 |= ISI_CFG1_PIXCLK_POL_ACTIVE_FALLING;
836
837 if (isi->pdata.has_emb_sync)
838 cfg1 |= ISI_CFG1_EMB_SYNC;
839 if (isi->pdata.full_mode)
840 cfg1 |= ISI_CFG1_FULL_MODE;
841
842 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
843 isi_writel(isi, ISI_CFG1, cfg1);
844
845 return 0;
846 }
847
848 static struct soc_camera_host_ops isi_soc_camera_host_ops = {
849 .owner = THIS_MODULE,
850 .add = isi_camera_add_device,
851 .remove = isi_camera_remove_device,
852 .clock_start = isi_camera_clock_start,
853 .clock_stop = isi_camera_clock_stop,
854 .set_fmt = isi_camera_set_fmt,
855 .try_fmt = isi_camera_try_fmt,
856 .get_formats = isi_camera_get_formats,
857 .init_videobuf2 = isi_camera_init_videobuf,
858 .poll = isi_camera_poll,
859 .querycap = isi_camera_querycap,
860 .set_bus_param = isi_camera_set_bus_param,
861 };
862
863 /* -----------------------------------------------------------------------*/
864 static int atmel_isi_remove(struct platform_device *pdev)
865 {
866 struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
867 struct atmel_isi *isi = container_of(soc_host,
868 struct atmel_isi, soc_host);
869
870 soc_camera_host_unregister(soc_host);
871 vb2_dma_contig_cleanup_ctx(isi->alloc_ctx);
872 dma_free_coherent(&pdev->dev,
873 sizeof(struct fbd) * MAX_BUFFER_NUM,
874 isi->p_fb_descriptors,
875 isi->fb_descriptors_phys);
876
877 return 0;
878 }
879
880 static int atmel_isi_probe_dt(struct atmel_isi *isi,
881 struct platform_device *pdev)
882 {
883 struct device_node *np= pdev->dev.of_node;
884 struct v4l2_of_endpoint ep;
885 int err;
886
887 /* Default settings for ISI */
888 isi->pdata.full_mode = 1;
889 isi->pdata.mck_hz = ISI_DEFAULT_MCLK_FREQ;
890 isi->pdata.frate = ISI_CFG1_FRATE_CAPTURE_ALL;
891
892 np = of_graph_get_next_endpoint(np, NULL);
893 if (!np) {
894 dev_err(&pdev->dev, "Could not find the endpoint\n");
895 return -EINVAL;
896 }
897
898 err = v4l2_of_parse_endpoint(np, &ep);
899 if (err) {
900 dev_err(&pdev->dev, "Could not parse the endpoint\n");
901 goto err_probe_dt;
902 }
903
904 switch (ep.bus.parallel.bus_width) {
905 case 8:
906 isi->pdata.data_width_flags = ISI_DATAWIDTH_8;
907 break;
908 case 10:
909 isi->pdata.data_width_flags =
910 ISI_DATAWIDTH_8 | ISI_DATAWIDTH_10;
911 break;
912 default:
913 dev_err(&pdev->dev, "Unsupported bus width: %d\n",
914 ep.bus.parallel.bus_width);
915 err = -EINVAL;
916 goto err_probe_dt;
917 }
918
919 err_probe_dt:
920 of_node_put(np);
921
922 return err;
923 }
924
925 static int atmel_isi_probe(struct platform_device *pdev)
926 {
927 unsigned int irq;
928 struct atmel_isi *isi;
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) && !pdev->dev.of_node) {
937 dev_err(&pdev->dev,
938 "No config available for Atmel ISI\n");
939 return -EINVAL;
940 }
941
942 isi = devm_kzalloc(&pdev->dev, sizeof(struct atmel_isi), GFP_KERNEL);
943 if (!isi) {
944 dev_err(&pdev->dev, "Can't allocate interface!\n");
945 return -ENOMEM;
946 }
947
948 isi->pclk = devm_clk_get(&pdev->dev, "isi_clk");
949 if (IS_ERR(isi->pclk))
950 return PTR_ERR(isi->pclk);
951
952 if (pdata) {
953 memcpy(&isi->pdata, pdata, sizeof(isi->pdata));
954 } else {
955 ret = atmel_isi_probe_dt(isi, pdev);
956 if (ret)
957 return ret;
958 }
959
960 isi->active = NULL;
961 spin_lock_init(&isi->lock);
962 INIT_LIST_HEAD(&isi->video_buffer_list);
963 INIT_LIST_HEAD(&isi->dma_desc_head);
964
965 /* ISI_MCK is the sensor master clock. It should be handled by the
966 * sensor driver directly, as the ISI has no use for that clock. Make
967 * the clock optional here while platforms transition to the correct
968 * model.
969 */
970 isi->mck = devm_clk_get(dev, "isi_mck");
971 if (!IS_ERR(isi->mck)) {
972 /* Set ISI_MCK's frequency, it should be faster than pixel
973 * clock.
974 */
975 ret = clk_set_rate(isi->mck, isi->pdata.mck_hz);
976 if (ret < 0)
977 return ret;
978 }
979
980 isi->p_fb_descriptors = dma_alloc_coherent(&pdev->dev,
981 sizeof(struct fbd) * MAX_BUFFER_NUM,
982 &isi->fb_descriptors_phys,
983 GFP_KERNEL);
984 if (!isi->p_fb_descriptors) {
985 dev_err(&pdev->dev, "Can't allocate descriptors!\n");
986 return -ENOMEM;
987 }
988
989 for (i = 0; i < MAX_BUFFER_NUM; i++) {
990 isi->dma_desc[i].p_fbd = isi->p_fb_descriptors + i;
991 isi->dma_desc[i].fbd_phys = isi->fb_descriptors_phys +
992 i * sizeof(struct fbd);
993 list_add(&isi->dma_desc[i].list, &isi->dma_desc_head);
994 }
995
996 isi->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
997 if (IS_ERR(isi->alloc_ctx)) {
998 ret = PTR_ERR(isi->alloc_ctx);
999 goto err_alloc_ctx;
1000 }
1001
1002 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1003 isi->regs = devm_ioremap_resource(&pdev->dev, regs);
1004 if (IS_ERR(isi->regs)) {
1005 ret = PTR_ERR(isi->regs);
1006 goto err_ioremap;
1007 }
1008
1009 if (isi->pdata.data_width_flags & ISI_DATAWIDTH_8)
1010 isi->width_flags = 1 << 7;
1011 if (isi->pdata.data_width_flags & ISI_DATAWIDTH_10)
1012 isi->width_flags |= 1 << 9;
1013
1014 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
1015
1016 irq = platform_get_irq(pdev, 0);
1017 if (IS_ERR_VALUE(irq)) {
1018 ret = irq;
1019 goto err_req_irq;
1020 }
1021
1022 ret = devm_request_irq(&pdev->dev, irq, isi_interrupt, 0, "isi", isi);
1023 if (ret) {
1024 dev_err(&pdev->dev, "Unable to request irq %d\n", irq);
1025 goto err_req_irq;
1026 }
1027 isi->irq = irq;
1028
1029 soc_host = &isi->soc_host;
1030 soc_host->drv_name = "isi-camera";
1031 soc_host->ops = &isi_soc_camera_host_ops;
1032 soc_host->priv = isi;
1033 soc_host->v4l2_dev.dev = &pdev->dev;
1034 soc_host->nr = pdev->id;
1035
1036 if (isi->pdata.asd_sizes) {
1037 soc_host->asd = isi->pdata.asd;
1038 soc_host->asd_sizes = isi->pdata.asd_sizes;
1039 }
1040
1041 ret = soc_camera_host_register(soc_host);
1042 if (ret) {
1043 dev_err(&pdev->dev, "Unable to register soc camera host\n");
1044 goto err_register_soc_camera_host;
1045 }
1046 return 0;
1047
1048 err_register_soc_camera_host:
1049 err_req_irq:
1050 err_ioremap:
1051 vb2_dma_contig_cleanup_ctx(isi->alloc_ctx);
1052 err_alloc_ctx:
1053 dma_free_coherent(&pdev->dev,
1054 sizeof(struct fbd) * MAX_BUFFER_NUM,
1055 isi->p_fb_descriptors,
1056 isi->fb_descriptors_phys);
1057
1058 return ret;
1059 }
1060
1061 static const struct of_device_id atmel_isi_of_match[] = {
1062 { .compatible = "atmel,at91sam9g45-isi" },
1063 { }
1064 };
1065 MODULE_DEVICE_TABLE(of, atmel_isi_of_match);
1066
1067 static struct platform_driver atmel_isi_driver = {
1068 .remove = atmel_isi_remove,
1069 .driver = {
1070 .name = "atmel_isi",
1071 .owner = THIS_MODULE,
1072 .of_match_table = of_match_ptr(atmel_isi_of_match),
1073 },
1074 };
1075
1076 module_platform_driver_probe(atmel_isi_driver, atmel_isi_probe);
1077
1078 MODULE_AUTHOR("Josh Wu <josh.wu@atmel.com>");
1079 MODULE_DESCRIPTION("The V4L2 driver for Atmel Linux");
1080 MODULE_LICENSE("GPL");
1081 MODULE_SUPPORTED_DEVICE("video");
Linux kernel - Deliverables
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