1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2011 Atmel Corporation
4 * Josh Wu, <josh.wu@atmel.com>
5 *
6 * Based on previous work by Lars Haring, <lars.haring@atmel.com>
7 * and Sedji Gaouaou
8 * Based on the bttv driver for Bt848 with respective copyright holders
9 */
10
11 #include <linux/clk.h>
12 #include <linux/completion.h>
13 #include <linux/delay.h>
14 #include <linux/fs.h>
15 #include <linux/init.h>
16 #include <linux/interrupt.h>
17 #include <linux/kernel.h>
18 #include <linux/module.h>
19 #include <linux/of_graph.h>
20 #include <linux/platform_device.h>
21 #include <linux/pm_runtime.h>
22 #include <linux/slab.h>
23 #include <linux/of.h>
24
25 #include <linux/videodev2.h>
26 #include <media/v4l2-ctrls.h>
27 #include <media/v4l2-device.h>
28 #include <media/v4l2-dev.h>
29 #include <media/v4l2-ioctl.h>
30 #include <media/v4l2-event.h>
31 #include <media/v4l2-fwnode.h>
32 #include <media/videobuf2-dma-contig.h>
33 #include <media/v4l2-image-sizes.h>
34
35 #include "atmel-isi.h"
36
37 #define MAX_SUPPORT_WIDTH 2048U
38 #define MAX_SUPPORT_HEIGHT 2048U
39 #define MIN_FRAME_RATE 15
40 #define FRAME_INTERVAL_MILLI_SEC (1000 / MIN_FRAME_RATE)
41
42 /* Frame buffer descriptor */
43 struct fbd {
44 /* Physical address of the frame buffer */
45 u32 fb_address;
46 /* DMA Control Register(only in HISI2) */
47 u32 dma_ctrl;
48 /* Physical address of the next fbd */
49 u32 next_fbd_address;
50 };
51
set_dma_ctrl(struct fbd * fb_desc,u32 ctrl)52 static void set_dma_ctrl(struct fbd *fb_desc, u32 ctrl)
53 {
54 fb_desc->dma_ctrl = ctrl;
55 }
56
57 struct isi_dma_desc {
58 struct list_head list;
59 struct fbd *p_fbd;
60 dma_addr_t fbd_phys;
61 };
62
63 /* Frame buffer data */
64 struct frame_buffer {
65 struct vb2_v4l2_buffer vb;
66 struct isi_dma_desc *p_dma_desc;
67 struct list_head list;
68 };
69
70 struct isi_graph_entity {
71 struct device_node *node;
72
73 struct v4l2_subdev *subdev;
74 };
75
76 /*
77 * struct isi_format - ISI media bus format information
78 * @fourcc: Fourcc code for this format
79 * @mbus_code: V4L2 media bus format code.
80 * @bpp: Bytes per pixel (when stored in memory)
81 * @swap: Byte swap configuration value
82 * @support: Indicates format supported by subdev
83 * @skip: Skip duplicate format supported by subdev
84 */
85 struct isi_format {
86 u32 fourcc;
87 u32 mbus_code;
88 u8 bpp;
89 u32 swap;
90 };
91
92
93 struct atmel_isi {
94 /* Protects the access of variables shared with the ISR */
95 spinlock_t irqlock;
96 struct device *dev;
97 void __iomem *regs;
98
99 int sequence;
100
101 /* Allocate descriptors for dma buffer use */
102 struct fbd *p_fb_descriptors;
103 dma_addr_t fb_descriptors_phys;
104 struct list_head dma_desc_head;
105 struct isi_dma_desc dma_desc[VIDEO_MAX_FRAME];
106 bool enable_preview_path;
107
108 struct completion complete;
109 /* ISI peripheral clock */
110 struct clk *pclk;
111 unsigned int irq;
112
113 struct isi_platform_data pdata;
114 u16 width_flags; /* max 12 bits */
115
116 struct list_head video_buffer_list;
117 struct frame_buffer *active;
118
119 struct v4l2_device v4l2_dev;
120 struct video_device *vdev;
121 struct v4l2_async_notifier notifier;
122 struct isi_graph_entity entity;
123 struct v4l2_format fmt;
124
125 const struct isi_format **user_formats;
126 unsigned int num_user_formats;
127 const struct isi_format *current_fmt;
128
129 struct mutex lock;
130 struct vb2_queue queue;
131 };
132
133 #define notifier_to_isi(n) container_of(n, struct atmel_isi, notifier)
134
isi_writel(struct atmel_isi * isi,u32 reg,u32 val)135 static void isi_writel(struct atmel_isi *isi, u32 reg, u32 val)
136 {
137 writel(val, isi->regs + reg);
138 }
isi_readl(struct atmel_isi * isi,u32 reg)139 static u32 isi_readl(struct atmel_isi *isi, u32 reg)
140 {
141 return readl(isi->regs + reg);
142 }
143
configure_geometry(struct atmel_isi * isi)144 static void configure_geometry(struct atmel_isi *isi)
145 {
146 u32 cfg2, psize;
147 u32 fourcc = isi->current_fmt->fourcc;
148
149 isi->enable_preview_path = fourcc == V4L2_PIX_FMT_RGB565 ||
150 fourcc == V4L2_PIX_FMT_RGB32 ||
151 fourcc == V4L2_PIX_FMT_Y16;
152
153 /* According to sensor's output format to set cfg2 */
154 cfg2 = isi->current_fmt->swap;
155
156 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
157 /* Set width */
158 cfg2 |= ((isi->fmt.fmt.pix.width - 1) << ISI_CFG2_IM_HSIZE_OFFSET) &
159 ISI_CFG2_IM_HSIZE_MASK;
160 /* Set height */
161 cfg2 |= ((isi->fmt.fmt.pix.height - 1) << ISI_CFG2_IM_VSIZE_OFFSET)
162 & ISI_CFG2_IM_VSIZE_MASK;
163 isi_writel(isi, ISI_CFG2, cfg2);
164
165 /* No down sampling, preview size equal to sensor output size */
166 psize = ((isi->fmt.fmt.pix.width - 1) << ISI_PSIZE_PREV_HSIZE_OFFSET) &
167 ISI_PSIZE_PREV_HSIZE_MASK;
168 psize |= ((isi->fmt.fmt.pix.height - 1) << ISI_PSIZE_PREV_VSIZE_OFFSET) &
169 ISI_PSIZE_PREV_VSIZE_MASK;
170 isi_writel(isi, ISI_PSIZE, psize);
171 isi_writel(isi, ISI_PDECF, ISI_PDECF_NO_SAMPLING);
172 }
173
atmel_isi_handle_streaming(struct atmel_isi * isi)174 static irqreturn_t atmel_isi_handle_streaming(struct atmel_isi *isi)
175 {
176 if (isi->active) {
177 struct vb2_v4l2_buffer *vbuf = &isi->active->vb;
178 struct frame_buffer *buf = isi->active;
179
180 list_del_init(&buf->list);
181 vbuf->vb2_buf.timestamp = ktime_get_ns();
182 vbuf->sequence = isi->sequence++;
183 vbuf->field = V4L2_FIELD_NONE;
184 vb2_buffer_done(&vbuf->vb2_buf, VB2_BUF_STATE_DONE);
185 }
186
187 if (list_empty(&isi->video_buffer_list)) {
188 isi->active = NULL;
189 } else {
190 /* start next dma frame. */
191 isi->active = list_entry(isi->video_buffer_list.next,
192 struct frame_buffer, list);
193 if (!isi->enable_preview_path) {
194 isi_writel(isi, ISI_DMA_C_DSCR,
195 (u32)isi->active->p_dma_desc->fbd_phys);
196 isi_writel(isi, ISI_DMA_C_CTRL,
197 ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
198 isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_C_CH);
199 } else {
200 isi_writel(isi, ISI_DMA_P_DSCR,
201 (u32)isi->active->p_dma_desc->fbd_phys);
202 isi_writel(isi, ISI_DMA_P_CTRL,
203 ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
204 isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_P_CH);
205 }
206 }
207 return IRQ_HANDLED;
208 }
209
210 /* ISI interrupt service routine */
isi_interrupt(int irq,void * dev_id)211 static irqreturn_t isi_interrupt(int irq, void *dev_id)
212 {
213 struct atmel_isi *isi = dev_id;
214 u32 status, mask, pending;
215 irqreturn_t ret = IRQ_NONE;
216
217 spin_lock(&isi->irqlock);
218
219 status = isi_readl(isi, ISI_STATUS);
220 mask = isi_readl(isi, ISI_INTMASK);
221 pending = status & mask;
222
223 if (pending & ISI_CTRL_SRST) {
224 complete(&isi->complete);
225 isi_writel(isi, ISI_INTDIS, ISI_CTRL_SRST);
226 ret = IRQ_HANDLED;
227 } else if (pending & ISI_CTRL_DIS) {
228 complete(&isi->complete);
229 isi_writel(isi, ISI_INTDIS, ISI_CTRL_DIS);
230 ret = IRQ_HANDLED;
231 } else {
232 if (likely(pending & ISI_SR_CXFR_DONE) ||
233 likely(pending & ISI_SR_PXFR_DONE))
234 ret = atmel_isi_handle_streaming(isi);
235 }
236
237 spin_unlock(&isi->irqlock);
238 return ret;
239 }
240
241 #define WAIT_ISI_RESET 1
242 #define WAIT_ISI_DISABLE 0
atmel_isi_wait_status(struct atmel_isi * isi,int wait_reset)243 static int atmel_isi_wait_status(struct atmel_isi *isi, int wait_reset)
244 {
245 unsigned long time_left;
246 /*
247 * The reset or disable will only succeed if we have a
248 * pixel clock from the camera.
249 */
250 init_completion(&isi->complete);
251
252 if (wait_reset) {
253 isi_writel(isi, ISI_INTEN, ISI_CTRL_SRST);
254 isi_writel(isi, ISI_CTRL, ISI_CTRL_SRST);
255 } else {
256 isi_writel(isi, ISI_INTEN, ISI_CTRL_DIS);
257 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
258 }
259
260 time_left = wait_for_completion_timeout(&isi->complete,
261 msecs_to_jiffies(500));
262 if (time_left == 0)
263 return -ETIMEDOUT;
264
265 return 0;
266 }
267
268 /* ------------------------------------------------------------------
269 Videobuf operations
270 ------------------------------------------------------------------*/
queue_setup(struct vb2_queue * vq,unsigned int * nbuffers,unsigned int * nplanes,unsigned int sizes[],struct device * alloc_devs[])271 static int queue_setup(struct vb2_queue *vq,
272 unsigned int *nbuffers, unsigned int *nplanes,
273 unsigned int sizes[], struct device *alloc_devs[])
274 {
275 struct atmel_isi *isi = vb2_get_drv_priv(vq);
276 unsigned long size;
277
278 size = isi->fmt.fmt.pix.sizeimage;
279
280 /* Make sure the image size is large enough. */
281 if (*nplanes)
282 return sizes[0] < size ? -EINVAL : 0;
283
284 *nplanes = 1;
285 sizes[0] = size;
286
287 isi->active = NULL;
288
289 dev_dbg(isi->dev, "%s, count=%d, size=%ld\n", __func__,
290 *nbuffers, size);
291
292 return 0;
293 }
294
buffer_init(struct vb2_buffer * vb)295 static int buffer_init(struct vb2_buffer *vb)
296 {
297 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
298 struct frame_buffer *buf = container_of(vbuf, struct frame_buffer, vb);
299
300 buf->p_dma_desc = NULL;
301 INIT_LIST_HEAD(&buf->list);
302
303 return 0;
304 }
305
buffer_prepare(struct vb2_buffer * vb)306 static int buffer_prepare(struct vb2_buffer *vb)
307 {
308 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
309 struct frame_buffer *buf = container_of(vbuf, struct frame_buffer, vb);
310 struct atmel_isi *isi = vb2_get_drv_priv(vb->vb2_queue);
311 unsigned long size;
312 struct isi_dma_desc *desc;
313
314 size = isi->fmt.fmt.pix.sizeimage;
315
316 if (vb2_plane_size(vb, 0) < size) {
317 dev_err(isi->dev, "%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(vb, 0, size);
323
324 if (!buf->p_dma_desc) {
325 if (list_empty(&isi->dma_desc_head)) {
326 dev_err(isi->dev, "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
buffer_cleanup(struct vb2_buffer * vb)347 static void buffer_cleanup(struct vb2_buffer *vb)
348 {
349 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
350 struct atmel_isi *isi = vb2_get_drv_priv(vb->vb2_queue);
351 struct frame_buffer *buf = container_of(vbuf, struct frame_buffer, vb);
352
353 /* This descriptor is available now and we add to head list */
354 if (buf->p_dma_desc)
355 list_add(&buf->p_dma_desc->list, &isi->dma_desc_head);
356 }
357
start_dma(struct atmel_isi * isi,struct frame_buffer * buffer)358 static void start_dma(struct atmel_isi *isi, struct frame_buffer *buffer)
359 {
360 u32 ctrl, cfg1;
361
362 cfg1 = isi_readl(isi, ISI_CFG1);
363 /* Enable irq: cxfr for the codec path, pxfr for the preview path */
364 isi_writel(isi, ISI_INTEN,
365 ISI_SR_CXFR_DONE | ISI_SR_PXFR_DONE);
366
367 /* Check if already in a frame */
368 if (!isi->enable_preview_path) {
369 if (isi_readl(isi, ISI_STATUS) & ISI_CTRL_CDC) {
370 dev_err(isi->dev, "Already in frame handling.\n");
371 return;
372 }
373
374 isi_writel(isi, ISI_DMA_C_DSCR,
375 (u32)buffer->p_dma_desc->fbd_phys);
376 isi_writel(isi, ISI_DMA_C_CTRL,
377 ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
378 isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_C_CH);
379 } else {
380 isi_writel(isi, ISI_DMA_P_DSCR,
381 (u32)buffer->p_dma_desc->fbd_phys);
382 isi_writel(isi, ISI_DMA_P_CTRL,
383 ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
384 isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_P_CH);
385 }
386
387 cfg1 &= ~ISI_CFG1_FRATE_DIV_MASK;
388 /* Enable linked list */
389 cfg1 |= isi->pdata.frate | ISI_CFG1_DISCR;
390
391 /* Enable ISI */
392 ctrl = ISI_CTRL_EN;
393
394 if (!isi->enable_preview_path)
395 ctrl |= ISI_CTRL_CDC;
396
397 isi_writel(isi, ISI_CTRL, ctrl);
398 isi_writel(isi, ISI_CFG1, cfg1);
399 }
400
buffer_queue(struct vb2_buffer * vb)401 static void buffer_queue(struct vb2_buffer *vb)
402 {
403 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
404 struct atmel_isi *isi = vb2_get_drv_priv(vb->vb2_queue);
405 struct frame_buffer *buf = container_of(vbuf, struct frame_buffer, vb);
406 unsigned long flags = 0;
407
408 spin_lock_irqsave(&isi->irqlock, flags);
409 list_add_tail(&buf->list, &isi->video_buffer_list);
410
411 if (!isi->active) {
412 isi->active = buf;
413 if (vb2_is_streaming(vb->vb2_queue))
414 start_dma(isi, buf);
415 }
416 spin_unlock_irqrestore(&isi->irqlock, flags);
417 }
418
start_streaming(struct vb2_queue * vq,unsigned int count)419 static int start_streaming(struct vb2_queue *vq, unsigned int count)
420 {
421 struct atmel_isi *isi = vb2_get_drv_priv(vq);
422 struct frame_buffer *buf, *node;
423 int ret;
424
425 ret = pm_runtime_resume_and_get(isi->dev);
426 if (ret < 0)
427 return ret;
428
429 /* Enable stream on the sub device */
430 ret = v4l2_subdev_call(isi->entity.subdev, video, s_stream, 1);
431 if (ret && ret != -ENOIOCTLCMD) {
432 dev_err(isi->dev, "stream on failed in subdev\n");
433 goto err_start_stream;
434 }
435
436 /* Reset ISI */
437 ret = atmel_isi_wait_status(isi, WAIT_ISI_RESET);
438 if (ret < 0) {
439 dev_err(isi->dev, "Reset ISI timed out\n");
440 goto err_reset;
441 }
442 /* Disable all interrupts */
443 isi_writel(isi, ISI_INTDIS, (u32)~0UL);
444
445 isi->sequence = 0;
446 configure_geometry(isi);
447
448 spin_lock_irq(&isi->irqlock);
449 /* Clear any pending interrupt */
450 isi_readl(isi, ISI_STATUS);
451
452 start_dma(isi, isi->active);
453 spin_unlock_irq(&isi->irqlock);
454
455 return 0;
456
457 err_reset:
458 v4l2_subdev_call(isi->entity.subdev, video, s_stream, 0);
459
460 err_start_stream:
461 pm_runtime_put(isi->dev);
462
463 spin_lock_irq(&isi->irqlock);
464 isi->active = NULL;
465 /* Release all active buffers */
466 list_for_each_entry_safe(buf, node, &isi->video_buffer_list, list) {
467 list_del_init(&buf->list);
468 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_QUEUED);
469 }
470 spin_unlock_irq(&isi->irqlock);
471
472 return ret;
473 }
474
475 /* abort streaming and wait for last buffer */
stop_streaming(struct vb2_queue * vq)476 static void stop_streaming(struct vb2_queue *vq)
477 {
478 struct atmel_isi *isi = vb2_get_drv_priv(vq);
479 struct frame_buffer *buf, *node;
480 int ret = 0;
481 unsigned long timeout;
482
483 /* Disable stream on the sub device */
484 ret = v4l2_subdev_call(isi->entity.subdev, video, s_stream, 0);
485 if (ret && ret != -ENOIOCTLCMD)
486 dev_err(isi->dev, "stream off failed in subdev\n");
487
488 spin_lock_irq(&isi->irqlock);
489 isi->active = NULL;
490 /* Release all active buffers */
491 list_for_each_entry_safe(buf, node, &isi->video_buffer_list, list) {
492 list_del_init(&buf->list);
493 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
494 }
495 spin_unlock_irq(&isi->irqlock);
496
497 if (!isi->enable_preview_path) {
498 timeout = jiffies + (FRAME_INTERVAL_MILLI_SEC * HZ) / 1000;
499 /* Wait until the end of the current frame. */
500 while ((isi_readl(isi, ISI_STATUS) & ISI_CTRL_CDC) &&
501 time_before(jiffies, timeout))
502 msleep(1);
503
504 if (time_after(jiffies, timeout))
505 dev_err(isi->dev,
506 "Timeout waiting for finishing codec request\n");
507 }
508
509 /* Disable interrupts */
510 isi_writel(isi, ISI_INTDIS,
511 ISI_SR_CXFR_DONE | ISI_SR_PXFR_DONE);
512
513 /* Disable ISI and wait for it is done */
514 ret = atmel_isi_wait_status(isi, WAIT_ISI_DISABLE);
515 if (ret < 0)
516 dev_err(isi->dev, "Disable ISI timed out\n");
517
518 pm_runtime_put(isi->dev);
519 }
520
521 static const struct vb2_ops isi_video_qops = {
522 .queue_setup = queue_setup,
523 .buf_init = buffer_init,
524 .buf_prepare = buffer_prepare,
525 .buf_cleanup = buffer_cleanup,
526 .buf_queue = buffer_queue,
527 .start_streaming = start_streaming,
528 .stop_streaming = stop_streaming,
529 };
530
isi_g_fmt_vid_cap(struct file * file,void * priv,struct v4l2_format * fmt)531 static int isi_g_fmt_vid_cap(struct file *file, void *priv,
532 struct v4l2_format *fmt)
533 {
534 struct atmel_isi *isi = video_drvdata(file);
535
536 *fmt = isi->fmt;
537
538 return 0;
539 }
540
find_format_by_fourcc(struct atmel_isi * isi,unsigned int fourcc)541 static const struct isi_format *find_format_by_fourcc(struct atmel_isi *isi,
542 unsigned int fourcc)
543 {
544 unsigned int num_formats = isi->num_user_formats;
545 const struct isi_format *fmt;
546 unsigned int i;
547
548 for (i = 0; i < num_formats; i++) {
549 fmt = isi->user_formats[i];
550 if (fmt->fourcc == fourcc)
551 return fmt;
552 }
553
554 return NULL;
555 }
556
isi_try_fse(struct atmel_isi * isi,const struct isi_format * isi_fmt,struct v4l2_subdev_state * sd_state)557 static void isi_try_fse(struct atmel_isi *isi, const struct isi_format *isi_fmt,
558 struct v4l2_subdev_state *sd_state)
559 {
560 struct v4l2_rect *try_crop =
561 v4l2_subdev_state_get_crop(sd_state, 0);
562 struct v4l2_subdev_frame_size_enum fse = {
563 .code = isi_fmt->mbus_code,
564 .which = V4L2_SUBDEV_FORMAT_TRY,
565 };
566 int ret;
567
568 ret = v4l2_subdev_call(isi->entity.subdev, pad, enum_frame_size,
569 sd_state, &fse);
570 /*
571 * Attempt to obtain format size from subdev. If not available,
572 * just use the maximum ISI can receive.
573 */
574 if (ret) {
575 try_crop->width = MAX_SUPPORT_WIDTH;
576 try_crop->height = MAX_SUPPORT_HEIGHT;
577 } else {
578 try_crop->width = fse.max_width;
579 try_crop->height = fse.max_height;
580 }
581 }
582
isi_try_fmt(struct atmel_isi * isi,struct v4l2_format * f,const struct isi_format ** current_fmt)583 static int isi_try_fmt(struct atmel_isi *isi, struct v4l2_format *f,
584 const struct isi_format **current_fmt)
585 {
586 const struct isi_format *isi_fmt;
587 struct v4l2_pix_format *pixfmt = &f->fmt.pix;
588 struct v4l2_subdev_pad_config pad_cfg = {};
589 struct v4l2_subdev_state pad_state = {
590 .sd = isi->entity.subdev,
591 .pads = &pad_cfg,
592 };
593 struct v4l2_subdev_format format = {
594 .which = V4L2_SUBDEV_FORMAT_TRY,
595 };
596 int ret;
597
598 isi_fmt = find_format_by_fourcc(isi, pixfmt->pixelformat);
599 if (!isi_fmt) {
600 isi_fmt = isi->user_formats[isi->num_user_formats - 1];
601 pixfmt->pixelformat = isi_fmt->fourcc;
602 }
603
604 /* Limit to Atmel ISI hardware capabilities */
605 pixfmt->width = clamp(pixfmt->width, 0U, MAX_SUPPORT_WIDTH);
606 pixfmt->height = clamp(pixfmt->height, 0U, MAX_SUPPORT_HEIGHT);
607
608 v4l2_fill_mbus_format(&format.format, pixfmt, isi_fmt->mbus_code);
609
610 isi_try_fse(isi, isi_fmt, &pad_state);
611
612 ret = v4l2_subdev_call(isi->entity.subdev, pad, set_fmt,
613 &pad_state, &format);
614 if (ret < 0)
615 return ret;
616
617 v4l2_fill_pix_format(pixfmt, &format.format);
618
619 pixfmt->field = V4L2_FIELD_NONE;
620 pixfmt->bytesperline = pixfmt->width * isi_fmt->bpp;
621 pixfmt->sizeimage = pixfmt->bytesperline * pixfmt->height;
622
623 if (current_fmt)
624 *current_fmt = isi_fmt;
625
626 return 0;
627 }
628
isi_set_fmt(struct atmel_isi * isi,struct v4l2_format * f)629 static int isi_set_fmt(struct atmel_isi *isi, struct v4l2_format *f)
630 {
631 struct v4l2_subdev_format format = {
632 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
633 };
634 const struct isi_format *current_fmt;
635 int ret;
636
637 ret = isi_try_fmt(isi, f, ¤t_fmt);
638 if (ret)
639 return ret;
640
641 v4l2_fill_mbus_format(&format.format, &f->fmt.pix,
642 current_fmt->mbus_code);
643 ret = v4l2_subdev_call(isi->entity.subdev, pad,
644 set_fmt, NULL, &format);
645 if (ret < 0)
646 return ret;
647
648 isi->fmt = *f;
649 isi->current_fmt = current_fmt;
650
651 return 0;
652 }
653
isi_s_fmt_vid_cap(struct file * file,void * priv,struct v4l2_format * f)654 static int isi_s_fmt_vid_cap(struct file *file, void *priv,
655 struct v4l2_format *f)
656 {
657 struct atmel_isi *isi = video_drvdata(file);
658
659 if (vb2_is_streaming(&isi->queue))
660 return -EBUSY;
661
662 return isi_set_fmt(isi, f);
663 }
664
isi_try_fmt_vid_cap(struct file * file,void * priv,struct v4l2_format * f)665 static int isi_try_fmt_vid_cap(struct file *file, void *priv,
666 struct v4l2_format *f)
667 {
668 struct atmel_isi *isi = video_drvdata(file);
669
670 return isi_try_fmt(isi, f, NULL);
671 }
672
isi_enum_fmt_vid_cap(struct file * file,void * priv,struct v4l2_fmtdesc * f)673 static int isi_enum_fmt_vid_cap(struct file *file, void *priv,
674 struct v4l2_fmtdesc *f)
675 {
676 struct atmel_isi *isi = video_drvdata(file);
677
678 if (f->index >= isi->num_user_formats)
679 return -EINVAL;
680
681 f->pixelformat = isi->user_formats[f->index]->fourcc;
682 return 0;
683 }
684
isi_querycap(struct file * file,void * priv,struct v4l2_capability * cap)685 static int isi_querycap(struct file *file, void *priv,
686 struct v4l2_capability *cap)
687 {
688 strscpy(cap->driver, "atmel-isi", sizeof(cap->driver));
689 strscpy(cap->card, "Atmel Image Sensor Interface", sizeof(cap->card));
690 strscpy(cap->bus_info, "platform:isi", sizeof(cap->bus_info));
691 return 0;
692 }
693
isi_enum_input(struct file * file,void * priv,struct v4l2_input * i)694 static int isi_enum_input(struct file *file, void *priv,
695 struct v4l2_input *i)
696 {
697 if (i->index != 0)
698 return -EINVAL;
699
700 i->type = V4L2_INPUT_TYPE_CAMERA;
701 strscpy(i->name, "Camera", sizeof(i->name));
702 return 0;
703 }
704
isi_g_input(struct file * file,void * priv,unsigned int * i)705 static int isi_g_input(struct file *file, void *priv, unsigned int *i)
706 {
707 *i = 0;
708 return 0;
709 }
710
isi_s_input(struct file * file,void * priv,unsigned int i)711 static int isi_s_input(struct file *file, void *priv, unsigned int i)
712 {
713 if (i > 0)
714 return -EINVAL;
715 return 0;
716 }
717
isi_g_parm(struct file * file,void * fh,struct v4l2_streamparm * a)718 static int isi_g_parm(struct file *file, void *fh, struct v4l2_streamparm *a)
719 {
720 struct atmel_isi *isi = video_drvdata(file);
721
722 return v4l2_g_parm_cap(video_devdata(file), isi->entity.subdev, a);
723 }
724
isi_s_parm(struct file * file,void * fh,struct v4l2_streamparm * a)725 static int isi_s_parm(struct file *file, void *fh, struct v4l2_streamparm *a)
726 {
727 struct atmel_isi *isi = video_drvdata(file);
728
729 return v4l2_s_parm_cap(video_devdata(file), isi->entity.subdev, a);
730 }
731
isi_enum_framesizes(struct file * file,void * fh,struct v4l2_frmsizeenum * fsize)732 static int isi_enum_framesizes(struct file *file, void *fh,
733 struct v4l2_frmsizeenum *fsize)
734 {
735 struct atmel_isi *isi = video_drvdata(file);
736 const struct isi_format *isi_fmt;
737 struct v4l2_subdev_frame_size_enum fse = {
738 .index = fsize->index,
739 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
740 };
741 int ret;
742
743 isi_fmt = find_format_by_fourcc(isi, fsize->pixel_format);
744 if (!isi_fmt)
745 return -EINVAL;
746
747 fse.code = isi_fmt->mbus_code;
748
749 ret = v4l2_subdev_call(isi->entity.subdev, pad, enum_frame_size,
750 NULL, &fse);
751 if (ret)
752 return ret;
753
754 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
755 fsize->discrete.width = fse.max_width;
756 fsize->discrete.height = fse.max_height;
757
758 return 0;
759 }
760
isi_enum_frameintervals(struct file * file,void * fh,struct v4l2_frmivalenum * fival)761 static int isi_enum_frameintervals(struct file *file, void *fh,
762 struct v4l2_frmivalenum *fival)
763 {
764 struct atmel_isi *isi = video_drvdata(file);
765 const struct isi_format *isi_fmt;
766 struct v4l2_subdev_frame_interval_enum fie = {
767 .index = fival->index,
768 .width = fival->width,
769 .height = fival->height,
770 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
771 };
772 int ret;
773
774 isi_fmt = find_format_by_fourcc(isi, fival->pixel_format);
775 if (!isi_fmt)
776 return -EINVAL;
777
778 fie.code = isi_fmt->mbus_code;
779
780 ret = v4l2_subdev_call(isi->entity.subdev, pad,
781 enum_frame_interval, NULL, &fie);
782 if (ret)
783 return ret;
784
785 fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
786 fival->discrete = fie.interval;
787
788 return 0;
789 }
790
isi_camera_set_bus_param(struct atmel_isi * isi)791 static int isi_camera_set_bus_param(struct atmel_isi *isi)
792 {
793 u32 cfg1 = 0;
794 int ret;
795
796 /* set bus param for ISI */
797 if (isi->pdata.hsync_act_low)
798 cfg1 |= ISI_CFG1_HSYNC_POL_ACTIVE_LOW;
799 if (isi->pdata.vsync_act_low)
800 cfg1 |= ISI_CFG1_VSYNC_POL_ACTIVE_LOW;
801 if (isi->pdata.pclk_act_falling)
802 cfg1 |= ISI_CFG1_PIXCLK_POL_ACTIVE_FALLING;
803 if (isi->pdata.has_emb_sync)
804 cfg1 |= ISI_CFG1_EMB_SYNC;
805 if (isi->pdata.full_mode)
806 cfg1 |= ISI_CFG1_FULL_MODE;
807
808 cfg1 |= ISI_CFG1_THMASK_BEATS_16;
809
810 /* Enable PM and peripheral clock before operate isi registers */
811 ret = pm_runtime_resume_and_get(isi->dev);
812 if (ret < 0)
813 return ret;
814
815 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
816 isi_writel(isi, ISI_CFG1, cfg1);
817
818 pm_runtime_put(isi->dev);
819
820 return 0;
821 }
822
823 /* -----------------------------------------------------------------------*/
atmel_isi_parse_dt(struct atmel_isi * isi,struct platform_device * pdev)824 static int atmel_isi_parse_dt(struct atmel_isi *isi,
825 struct platform_device *pdev)
826 {
827 struct device_node *np = pdev->dev.of_node;
828 struct v4l2_fwnode_endpoint ep = { .bus_type = 0 };
829 int err;
830
831 /* Default settings for ISI */
832 isi->pdata.full_mode = 1;
833 isi->pdata.frate = ISI_CFG1_FRATE_CAPTURE_ALL;
834
835 np = of_graph_get_endpoint_by_regs(np, 0, -1);
836 if (!np) {
837 dev_err(&pdev->dev, "Could not find the endpoint\n");
838 return -EINVAL;
839 }
840
841 err = v4l2_fwnode_endpoint_parse(of_fwnode_handle(np), &ep);
842 of_node_put(np);
843 if (err) {
844 dev_err(&pdev->dev, "Could not parse the endpoint\n");
845 return err;
846 }
847
848 switch (ep.bus.parallel.bus_width) {
849 case 8:
850 isi->pdata.data_width_flags = ISI_DATAWIDTH_8;
851 break;
852 case 10:
853 isi->pdata.data_width_flags =
854 ISI_DATAWIDTH_8 | ISI_DATAWIDTH_10;
855 break;
856 default:
857 dev_err(&pdev->dev, "Unsupported bus width: %d\n",
858 ep.bus.parallel.bus_width);
859 return -EINVAL;
860 }
861
862 if (ep.bus.parallel.flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)
863 isi->pdata.hsync_act_low = true;
864 if (ep.bus.parallel.flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
865 isi->pdata.vsync_act_low = true;
866 if (ep.bus.parallel.flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)
867 isi->pdata.pclk_act_falling = true;
868
869 if (ep.bus_type == V4L2_MBUS_BT656)
870 isi->pdata.has_emb_sync = true;
871
872 return 0;
873 }
874
isi_open(struct file * file)875 static int isi_open(struct file *file)
876 {
877 struct atmel_isi *isi = video_drvdata(file);
878 struct v4l2_subdev *sd = isi->entity.subdev;
879 int ret;
880
881 if (mutex_lock_interruptible(&isi->lock))
882 return -ERESTARTSYS;
883
884 ret = v4l2_fh_open(file);
885 if (ret < 0)
886 goto unlock;
887
888 if (!v4l2_fh_is_singular_file(file))
889 goto fh_rel;
890
891 ret = v4l2_subdev_call(sd, core, s_power, 1);
892 if (ret < 0 && ret != -ENOIOCTLCMD)
893 goto fh_rel;
894
895 ret = isi_set_fmt(isi, &isi->fmt);
896 if (ret)
897 v4l2_subdev_call(sd, core, s_power, 0);
898 fh_rel:
899 if (ret)
900 v4l2_fh_release(file);
901 unlock:
902 mutex_unlock(&isi->lock);
903 return ret;
904 }
905
isi_release(struct file * file)906 static int isi_release(struct file *file)
907 {
908 struct atmel_isi *isi = video_drvdata(file);
909 struct v4l2_subdev *sd = isi->entity.subdev;
910 bool fh_singular;
911 int ret;
912
913 mutex_lock(&isi->lock);
914
915 fh_singular = v4l2_fh_is_singular_file(file);
916
917 ret = _vb2_fop_release(file, NULL);
918
919 if (fh_singular)
920 v4l2_subdev_call(sd, core, s_power, 0);
921
922 mutex_unlock(&isi->lock);
923
924 return ret;
925 }
926
927 static const struct v4l2_ioctl_ops isi_ioctl_ops = {
928 .vidioc_querycap = isi_querycap,
929
930 .vidioc_try_fmt_vid_cap = isi_try_fmt_vid_cap,
931 .vidioc_g_fmt_vid_cap = isi_g_fmt_vid_cap,
932 .vidioc_s_fmt_vid_cap = isi_s_fmt_vid_cap,
933 .vidioc_enum_fmt_vid_cap = isi_enum_fmt_vid_cap,
934
935 .vidioc_enum_input = isi_enum_input,
936 .vidioc_g_input = isi_g_input,
937 .vidioc_s_input = isi_s_input,
938
939 .vidioc_g_parm = isi_g_parm,
940 .vidioc_s_parm = isi_s_parm,
941 .vidioc_enum_framesizes = isi_enum_framesizes,
942 .vidioc_enum_frameintervals = isi_enum_frameintervals,
943
944 .vidioc_reqbufs = vb2_ioctl_reqbufs,
945 .vidioc_create_bufs = vb2_ioctl_create_bufs,
946 .vidioc_querybuf = vb2_ioctl_querybuf,
947 .vidioc_qbuf = vb2_ioctl_qbuf,
948 .vidioc_dqbuf = vb2_ioctl_dqbuf,
949 .vidioc_expbuf = vb2_ioctl_expbuf,
950 .vidioc_prepare_buf = vb2_ioctl_prepare_buf,
951 .vidioc_streamon = vb2_ioctl_streamon,
952 .vidioc_streamoff = vb2_ioctl_streamoff,
953
954 .vidioc_log_status = v4l2_ctrl_log_status,
955 .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
956 .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
957 };
958
959 static const struct v4l2_file_operations isi_fops = {
960 .owner = THIS_MODULE,
961 .unlocked_ioctl = video_ioctl2,
962 .open = isi_open,
963 .release = isi_release,
964 .poll = vb2_fop_poll,
965 .mmap = vb2_fop_mmap,
966 .read = vb2_fop_read,
967 };
968
isi_set_default_fmt(struct atmel_isi * isi)969 static int isi_set_default_fmt(struct atmel_isi *isi)
970 {
971 struct v4l2_format f = {
972 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
973 .fmt.pix = {
974 .width = VGA_WIDTH,
975 .height = VGA_HEIGHT,
976 .field = V4L2_FIELD_NONE,
977 .pixelformat = isi->user_formats[0]->fourcc,
978 },
979 };
980 int ret;
981
982 ret = isi_try_fmt(isi, &f, NULL);
983 if (ret)
984 return ret;
985 isi->current_fmt = isi->user_formats[0];
986 isi->fmt = f;
987 return 0;
988 }
989
990 static const struct isi_format isi_formats[] = {
991 {
992 .fourcc = V4L2_PIX_FMT_YUYV,
993 .mbus_code = MEDIA_BUS_FMT_YUYV8_2X8,
994 .bpp = 2,
995 .swap = ISI_CFG2_YCC_SWAP_DEFAULT,
996 }, {
997 .fourcc = V4L2_PIX_FMT_YUYV,
998 .mbus_code = MEDIA_BUS_FMT_YVYU8_2X8,
999 .bpp = 2,
1000 .swap = ISI_CFG2_YCC_SWAP_MODE_1,
1001 }, {
1002 .fourcc = V4L2_PIX_FMT_YUYV,
1003 .mbus_code = MEDIA_BUS_FMT_UYVY8_2X8,
1004 .bpp = 2,
1005 .swap = ISI_CFG2_YCC_SWAP_MODE_2,
1006 }, {
1007 .fourcc = V4L2_PIX_FMT_YUYV,
1008 .mbus_code = MEDIA_BUS_FMT_VYUY8_2X8,
1009 .bpp = 2,
1010 .swap = ISI_CFG2_YCC_SWAP_MODE_3,
1011 }, {
1012 .fourcc = V4L2_PIX_FMT_RGB565,
1013 .mbus_code = MEDIA_BUS_FMT_YUYV8_2X8,
1014 .bpp = 2,
1015 .swap = ISI_CFG2_YCC_SWAP_MODE_2,
1016 }, {
1017 .fourcc = V4L2_PIX_FMT_RGB565,
1018 .mbus_code = MEDIA_BUS_FMT_YVYU8_2X8,
1019 .bpp = 2,
1020 .swap = ISI_CFG2_YCC_SWAP_MODE_3,
1021 }, {
1022 .fourcc = V4L2_PIX_FMT_RGB565,
1023 .mbus_code = MEDIA_BUS_FMT_UYVY8_2X8,
1024 .bpp = 2,
1025 .swap = ISI_CFG2_YCC_SWAP_DEFAULT,
1026 }, {
1027 .fourcc = V4L2_PIX_FMT_RGB565,
1028 .mbus_code = MEDIA_BUS_FMT_VYUY8_2X8,
1029 .bpp = 2,
1030 .swap = ISI_CFG2_YCC_SWAP_MODE_1,
1031 }, {
1032 .fourcc = V4L2_PIX_FMT_GREY,
1033 .mbus_code = MEDIA_BUS_FMT_Y10_1X10,
1034 .bpp = 1,
1035 .swap = ISI_CFG2_GS_MODE_2_PIXEL | ISI_CFG2_GRAYSCALE,
1036 }, {
1037 .fourcc = V4L2_PIX_FMT_Y16,
1038 .mbus_code = MEDIA_BUS_FMT_Y10_1X10,
1039 .bpp = 2,
1040 .swap = ISI_CFG2_GS_MODE_2_PIXEL | ISI_CFG2_GRAYSCALE,
1041 },
1042 };
1043
isi_formats_init(struct atmel_isi * isi)1044 static int isi_formats_init(struct atmel_isi *isi)
1045 {
1046 const struct isi_format *isi_fmts[ARRAY_SIZE(isi_formats)];
1047 unsigned int num_fmts = 0, i, j;
1048 struct v4l2_subdev *subdev = isi->entity.subdev;
1049 struct v4l2_subdev_mbus_code_enum mbus_code = {
1050 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1051 };
1052
1053 while (!v4l2_subdev_call(subdev, pad, enum_mbus_code,
1054 NULL, &mbus_code)) {
1055 for (i = 0; i < ARRAY_SIZE(isi_formats); i++) {
1056 if (isi_formats[i].mbus_code != mbus_code.code)
1057 continue;
1058
1059 /* Code supported, have we got this fourcc yet? */
1060 for (j = 0; j < num_fmts; j++)
1061 if (isi_fmts[j]->fourcc == isi_formats[i].fourcc)
1062 /* Already available */
1063 break;
1064 if (j == num_fmts)
1065 /* new */
1066 isi_fmts[num_fmts++] = isi_formats + i;
1067 }
1068 mbus_code.index++;
1069 }
1070
1071 if (!num_fmts)
1072 return -ENXIO;
1073
1074 isi->num_user_formats = num_fmts;
1075 isi->user_formats = devm_kcalloc(isi->dev,
1076 num_fmts, sizeof(struct isi_format *),
1077 GFP_KERNEL);
1078 if (!isi->user_formats)
1079 return -ENOMEM;
1080
1081 memcpy(isi->user_formats, isi_fmts,
1082 num_fmts * sizeof(struct isi_format *));
1083 isi->current_fmt = isi->user_formats[0];
1084
1085 return 0;
1086 }
1087
isi_graph_notify_complete(struct v4l2_async_notifier * notifier)1088 static int isi_graph_notify_complete(struct v4l2_async_notifier *notifier)
1089 {
1090 struct atmel_isi *isi = notifier_to_isi(notifier);
1091 int ret;
1092
1093 isi->vdev->ctrl_handler = isi->entity.subdev->ctrl_handler;
1094 ret = isi_formats_init(isi);
1095 if (ret) {
1096 dev_err(isi->dev, "No supported mediabus format found\n");
1097 return ret;
1098 }
1099 ret = isi_camera_set_bus_param(isi);
1100 if (ret) {
1101 dev_err(isi->dev, "Can't wake up device\n");
1102 return ret;
1103 }
1104
1105 ret = isi_set_default_fmt(isi);
1106 if (ret) {
1107 dev_err(isi->dev, "Could not set default format\n");
1108 return ret;
1109 }
1110
1111 ret = video_register_device(isi->vdev, VFL_TYPE_VIDEO, -1);
1112 if (ret) {
1113 dev_err(isi->dev, "Failed to register video device\n");
1114 return ret;
1115 }
1116
1117 dev_dbg(isi->dev, "Device registered as %s\n",
1118 video_device_node_name(isi->vdev));
1119 return 0;
1120 }
1121
isi_graph_notify_unbind(struct v4l2_async_notifier * notifier,struct v4l2_subdev * sd,struct v4l2_async_connection * asd)1122 static void isi_graph_notify_unbind(struct v4l2_async_notifier *notifier,
1123 struct v4l2_subdev *sd,
1124 struct v4l2_async_connection *asd)
1125 {
1126 struct atmel_isi *isi = notifier_to_isi(notifier);
1127
1128 dev_dbg(isi->dev, "Removing %s\n", video_device_node_name(isi->vdev));
1129
1130 /* Checks internally if vdev have been init or not */
1131 video_unregister_device(isi->vdev);
1132 }
1133
isi_graph_notify_bound(struct v4l2_async_notifier * notifier,struct v4l2_subdev * subdev,struct v4l2_async_connection * asd)1134 static int isi_graph_notify_bound(struct v4l2_async_notifier *notifier,
1135 struct v4l2_subdev *subdev,
1136 struct v4l2_async_connection *asd)
1137 {
1138 struct atmel_isi *isi = notifier_to_isi(notifier);
1139
1140 dev_dbg(isi->dev, "subdev %s bound\n", subdev->name);
1141
1142 isi->entity.subdev = subdev;
1143
1144 return 0;
1145 }
1146
1147 static const struct v4l2_async_notifier_operations isi_graph_notify_ops = {
1148 .bound = isi_graph_notify_bound,
1149 .unbind = isi_graph_notify_unbind,
1150 .complete = isi_graph_notify_complete,
1151 };
1152
isi_graph_init(struct atmel_isi * isi)1153 static int isi_graph_init(struct atmel_isi *isi)
1154 {
1155 struct v4l2_async_connection *asd;
1156 struct device_node *ep;
1157 int ret;
1158
1159 ep = of_graph_get_endpoint_by_regs(isi->dev->of_node, 0, -1);
1160 if (!ep)
1161 return -EINVAL;
1162
1163 v4l2_async_nf_init(&isi->notifier, &isi->v4l2_dev);
1164
1165 asd = v4l2_async_nf_add_fwnode_remote(&isi->notifier,
1166 of_fwnode_handle(ep),
1167 struct v4l2_async_connection);
1168 of_node_put(ep);
1169
1170 if (IS_ERR(asd))
1171 return PTR_ERR(asd);
1172
1173 isi->notifier.ops = &isi_graph_notify_ops;
1174
1175 ret = v4l2_async_nf_register(&isi->notifier);
1176 if (ret < 0) {
1177 dev_err(isi->dev, "Notifier registration failed\n");
1178 v4l2_async_nf_cleanup(&isi->notifier);
1179 return ret;
1180 }
1181
1182 return 0;
1183 }
1184
1185
atmel_isi_probe(struct platform_device * pdev)1186 static int atmel_isi_probe(struct platform_device *pdev)
1187 {
1188 int irq;
1189 struct atmel_isi *isi;
1190 struct vb2_queue *q;
1191 int ret, i;
1192
1193 isi = devm_kzalloc(&pdev->dev, sizeof(struct atmel_isi), GFP_KERNEL);
1194 if (!isi)
1195 return -ENOMEM;
1196
1197 isi->pclk = devm_clk_get(&pdev->dev, "isi_clk");
1198 if (IS_ERR(isi->pclk))
1199 return PTR_ERR(isi->pclk);
1200
1201 ret = atmel_isi_parse_dt(isi, pdev);
1202 if (ret)
1203 return ret;
1204
1205 isi->active = NULL;
1206 isi->dev = &pdev->dev;
1207 mutex_init(&isi->lock);
1208 spin_lock_init(&isi->irqlock);
1209 INIT_LIST_HEAD(&isi->video_buffer_list);
1210 INIT_LIST_HEAD(&isi->dma_desc_head);
1211
1212 q = &isi->queue;
1213
1214 /* Initialize the top-level structure */
1215 ret = v4l2_device_register(&pdev->dev, &isi->v4l2_dev);
1216 if (ret)
1217 return ret;
1218
1219 isi->vdev = video_device_alloc();
1220 if (!isi->vdev) {
1221 ret = -ENOMEM;
1222 goto err_vdev_alloc;
1223 }
1224
1225 /* video node */
1226 isi->vdev->fops = &isi_fops;
1227 isi->vdev->v4l2_dev = &isi->v4l2_dev;
1228 isi->vdev->queue = &isi->queue;
1229 strscpy(isi->vdev->name, KBUILD_MODNAME, sizeof(isi->vdev->name));
1230 isi->vdev->release = video_device_release;
1231 isi->vdev->ioctl_ops = &isi_ioctl_ops;
1232 isi->vdev->lock = &isi->lock;
1233 isi->vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING |
1234 V4L2_CAP_READWRITE;
1235 video_set_drvdata(isi->vdev, isi);
1236
1237 /* buffer queue */
1238 q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1239 q->io_modes = VB2_MMAP | VB2_READ | VB2_DMABUF;
1240 q->lock = &isi->lock;
1241 q->drv_priv = isi;
1242 q->buf_struct_size = sizeof(struct frame_buffer);
1243 q->ops = &isi_video_qops;
1244 q->mem_ops = &vb2_dma_contig_memops;
1245 q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
1246 q->min_queued_buffers = 2;
1247 q->dev = &pdev->dev;
1248
1249 ret = vb2_queue_init(q);
1250 if (ret < 0) {
1251 dev_err(&pdev->dev, "failed to initialize VB2 queue\n");
1252 goto err_vb2_queue;
1253 }
1254 isi->p_fb_descriptors = dma_alloc_coherent(&pdev->dev,
1255 sizeof(struct fbd) * VIDEO_MAX_FRAME,
1256 &isi->fb_descriptors_phys,
1257 GFP_KERNEL);
1258 if (!isi->p_fb_descriptors) {
1259 dev_err(&pdev->dev, "Can't allocate descriptors!\n");
1260 ret = -ENOMEM;
1261 goto err_dma_alloc;
1262 }
1263
1264 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
1265 isi->dma_desc[i].p_fbd = isi->p_fb_descriptors + i;
1266 isi->dma_desc[i].fbd_phys = isi->fb_descriptors_phys +
1267 i * sizeof(struct fbd);
1268 list_add(&isi->dma_desc[i].list, &isi->dma_desc_head);
1269 }
1270
1271 isi->regs = devm_platform_ioremap_resource(pdev, 0);
1272 if (IS_ERR(isi->regs)) {
1273 ret = PTR_ERR(isi->regs);
1274 goto err_ioremap;
1275 }
1276
1277 if (isi->pdata.data_width_flags & ISI_DATAWIDTH_8)
1278 isi->width_flags = 1 << 7;
1279 if (isi->pdata.data_width_flags & ISI_DATAWIDTH_10)
1280 isi->width_flags |= 1 << 9;
1281
1282 irq = platform_get_irq(pdev, 0);
1283 if (irq < 0) {
1284 ret = irq;
1285 goto err_req_irq;
1286 }
1287
1288 ret = devm_request_irq(&pdev->dev, irq, isi_interrupt, 0, "isi", isi);
1289 if (ret) {
1290 dev_err(&pdev->dev, "Unable to request irq %d\n", irq);
1291 goto err_req_irq;
1292 }
1293 isi->irq = irq;
1294
1295 ret = isi_graph_init(isi);
1296 if (ret < 0)
1297 goto err_req_irq;
1298
1299 pm_suspend_ignore_children(&pdev->dev, true);
1300 pm_runtime_enable(&pdev->dev);
1301 platform_set_drvdata(pdev, isi);
1302 return 0;
1303
1304 err_req_irq:
1305 err_ioremap:
1306 dma_free_coherent(&pdev->dev,
1307 sizeof(struct fbd) * VIDEO_MAX_FRAME,
1308 isi->p_fb_descriptors,
1309 isi->fb_descriptors_phys);
1310 err_dma_alloc:
1311 err_vb2_queue:
1312 video_device_release(isi->vdev);
1313 err_vdev_alloc:
1314 v4l2_device_unregister(&isi->v4l2_dev);
1315
1316 return ret;
1317 }
1318
atmel_isi_remove(struct platform_device * pdev)1319 static void atmel_isi_remove(struct platform_device *pdev)
1320 {
1321 struct atmel_isi *isi = platform_get_drvdata(pdev);
1322
1323 dma_free_coherent(&pdev->dev,
1324 sizeof(struct fbd) * VIDEO_MAX_FRAME,
1325 isi->p_fb_descriptors,
1326 isi->fb_descriptors_phys);
1327 pm_runtime_disable(&pdev->dev);
1328 v4l2_async_nf_unregister(&isi->notifier);
1329 v4l2_async_nf_cleanup(&isi->notifier);
1330 v4l2_device_unregister(&isi->v4l2_dev);
1331 }
1332
1333 #ifdef CONFIG_PM
atmel_isi_runtime_suspend(struct device * dev)1334 static int atmel_isi_runtime_suspend(struct device *dev)
1335 {
1336 struct atmel_isi *isi = dev_get_drvdata(dev);
1337
1338 clk_disable_unprepare(isi->pclk);
1339
1340 return 0;
1341 }
atmel_isi_runtime_resume(struct device * dev)1342 static int atmel_isi_runtime_resume(struct device *dev)
1343 {
1344 struct atmel_isi *isi = dev_get_drvdata(dev);
1345
1346 return clk_prepare_enable(isi->pclk);
1347 }
1348 #endif /* CONFIG_PM */
1349
1350 static const struct dev_pm_ops atmel_isi_dev_pm_ops = {
1351 SET_RUNTIME_PM_OPS(atmel_isi_runtime_suspend,
1352 atmel_isi_runtime_resume, NULL)
1353 };
1354
1355 static const struct of_device_id atmel_isi_of_match[] = {
1356 { .compatible = "atmel,at91sam9g45-isi" },
1357 { }
1358 };
1359 MODULE_DEVICE_TABLE(of, atmel_isi_of_match);
1360
1361 static struct platform_driver atmel_isi_driver = {
1362 .driver = {
1363 .name = "atmel_isi",
1364 .of_match_table = of_match_ptr(atmel_isi_of_match),
1365 .pm = &atmel_isi_dev_pm_ops,
1366 },
1367 .probe = atmel_isi_probe,
1368 .remove = atmel_isi_remove,
1369 };
1370
1371 module_platform_driver(atmel_isi_driver);
1372
1373 MODULE_AUTHOR("Josh Wu <josh.wu@atmel.com>");
1374 MODULE_DESCRIPTION("The V4L2 driver for Atmel Linux");
1375 MODULE_LICENSE("GPL");
1376