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 .wait_prepare = vb2_ops_wait_prepare,
530 .wait_finish = vb2_ops_wait_finish,
531 };
532
isi_g_fmt_vid_cap(struct file * file,void * priv,struct v4l2_format * fmt)533 static int isi_g_fmt_vid_cap(struct file *file, void *priv,
534 struct v4l2_format *fmt)
535 {
536 struct atmel_isi *isi = video_drvdata(file);
537
538 *fmt = isi->fmt;
539
540 return 0;
541 }
542
find_format_by_fourcc(struct atmel_isi * isi,unsigned int fourcc)543 static const struct isi_format *find_format_by_fourcc(struct atmel_isi *isi,
544 unsigned int fourcc)
545 {
546 unsigned int num_formats = isi->num_user_formats;
547 const struct isi_format *fmt;
548 unsigned int i;
549
550 for (i = 0; i < num_formats; i++) {
551 fmt = isi->user_formats[i];
552 if (fmt->fourcc == fourcc)
553 return fmt;
554 }
555
556 return NULL;
557 }
558
isi_try_fse(struct atmel_isi * isi,const struct isi_format * isi_fmt,struct v4l2_subdev_state * sd_state)559 static void isi_try_fse(struct atmel_isi *isi, const struct isi_format *isi_fmt,
560 struct v4l2_subdev_state *sd_state)
561 {
562 struct v4l2_rect *try_crop =
563 v4l2_subdev_state_get_crop(sd_state, 0);
564 struct v4l2_subdev_frame_size_enum fse = {
565 .code = isi_fmt->mbus_code,
566 .which = V4L2_SUBDEV_FORMAT_TRY,
567 };
568 int ret;
569
570 ret = v4l2_subdev_call(isi->entity.subdev, pad, enum_frame_size,
571 sd_state, &fse);
572 /*
573 * Attempt to obtain format size from subdev. If not available,
574 * just use the maximum ISI can receive.
575 */
576 if (ret) {
577 try_crop->width = MAX_SUPPORT_WIDTH;
578 try_crop->height = MAX_SUPPORT_HEIGHT;
579 } else {
580 try_crop->width = fse.max_width;
581 try_crop->height = fse.max_height;
582 }
583 }
584
isi_try_fmt(struct atmel_isi * isi,struct v4l2_format * f,const struct isi_format ** current_fmt)585 static int isi_try_fmt(struct atmel_isi *isi, struct v4l2_format *f,
586 const struct isi_format **current_fmt)
587 {
588 const struct isi_format *isi_fmt;
589 struct v4l2_pix_format *pixfmt = &f->fmt.pix;
590 struct v4l2_subdev_pad_config pad_cfg = {};
591 struct v4l2_subdev_state pad_state = {
592 .sd = isi->entity.subdev,
593 .pads = &pad_cfg,
594 };
595 struct v4l2_subdev_format format = {
596 .which = V4L2_SUBDEV_FORMAT_TRY,
597 };
598 int ret;
599
600 isi_fmt = find_format_by_fourcc(isi, pixfmt->pixelformat);
601 if (!isi_fmt) {
602 isi_fmt = isi->user_formats[isi->num_user_formats - 1];
603 pixfmt->pixelformat = isi_fmt->fourcc;
604 }
605
606 /* Limit to Atmel ISI hardware capabilities */
607 pixfmt->width = clamp(pixfmt->width, 0U, MAX_SUPPORT_WIDTH);
608 pixfmt->height = clamp(pixfmt->height, 0U, MAX_SUPPORT_HEIGHT);
609
610 v4l2_fill_mbus_format(&format.format, pixfmt, isi_fmt->mbus_code);
611
612 isi_try_fse(isi, isi_fmt, &pad_state);
613
614 ret = v4l2_subdev_call(isi->entity.subdev, pad, set_fmt,
615 &pad_state, &format);
616 if (ret < 0)
617 return ret;
618
619 v4l2_fill_pix_format(pixfmt, &format.format);
620
621 pixfmt->field = V4L2_FIELD_NONE;
622 pixfmt->bytesperline = pixfmt->width * isi_fmt->bpp;
623 pixfmt->sizeimage = pixfmt->bytesperline * pixfmt->height;
624
625 if (current_fmt)
626 *current_fmt = isi_fmt;
627
628 return 0;
629 }
630
isi_set_fmt(struct atmel_isi * isi,struct v4l2_format * f)631 static int isi_set_fmt(struct atmel_isi *isi, struct v4l2_format *f)
632 {
633 struct v4l2_subdev_format format = {
634 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
635 };
636 const struct isi_format *current_fmt;
637 int ret;
638
639 ret = isi_try_fmt(isi, f, ¤t_fmt);
640 if (ret)
641 return ret;
642
643 v4l2_fill_mbus_format(&format.format, &f->fmt.pix,
644 current_fmt->mbus_code);
645 ret = v4l2_subdev_call(isi->entity.subdev, pad,
646 set_fmt, NULL, &format);
647 if (ret < 0)
648 return ret;
649
650 isi->fmt = *f;
651 isi->current_fmt = current_fmt;
652
653 return 0;
654 }
655
isi_s_fmt_vid_cap(struct file * file,void * priv,struct v4l2_format * f)656 static int isi_s_fmt_vid_cap(struct file *file, void *priv,
657 struct v4l2_format *f)
658 {
659 struct atmel_isi *isi = video_drvdata(file);
660
661 if (vb2_is_streaming(&isi->queue))
662 return -EBUSY;
663
664 return isi_set_fmt(isi, f);
665 }
666
isi_try_fmt_vid_cap(struct file * file,void * priv,struct v4l2_format * f)667 static int isi_try_fmt_vid_cap(struct file *file, void *priv,
668 struct v4l2_format *f)
669 {
670 struct atmel_isi *isi = video_drvdata(file);
671
672 return isi_try_fmt(isi, f, NULL);
673 }
674
isi_enum_fmt_vid_cap(struct file * file,void * priv,struct v4l2_fmtdesc * f)675 static int isi_enum_fmt_vid_cap(struct file *file, void *priv,
676 struct v4l2_fmtdesc *f)
677 {
678 struct atmel_isi *isi = video_drvdata(file);
679
680 if (f->index >= isi->num_user_formats)
681 return -EINVAL;
682
683 f->pixelformat = isi->user_formats[f->index]->fourcc;
684 return 0;
685 }
686
isi_querycap(struct file * file,void * priv,struct v4l2_capability * cap)687 static int isi_querycap(struct file *file, void *priv,
688 struct v4l2_capability *cap)
689 {
690 strscpy(cap->driver, "atmel-isi", sizeof(cap->driver));
691 strscpy(cap->card, "Atmel Image Sensor Interface", sizeof(cap->card));
692 strscpy(cap->bus_info, "platform:isi", sizeof(cap->bus_info));
693 return 0;
694 }
695
isi_enum_input(struct file * file,void * priv,struct v4l2_input * i)696 static int isi_enum_input(struct file *file, void *priv,
697 struct v4l2_input *i)
698 {
699 if (i->index != 0)
700 return -EINVAL;
701
702 i->type = V4L2_INPUT_TYPE_CAMERA;
703 strscpy(i->name, "Camera", sizeof(i->name));
704 return 0;
705 }
706
isi_g_input(struct file * file,void * priv,unsigned int * i)707 static int isi_g_input(struct file *file, void *priv, unsigned int *i)
708 {
709 *i = 0;
710 return 0;
711 }
712
isi_s_input(struct file * file,void * priv,unsigned int i)713 static int isi_s_input(struct file *file, void *priv, unsigned int i)
714 {
715 if (i > 0)
716 return -EINVAL;
717 return 0;
718 }
719
isi_g_parm(struct file * file,void * fh,struct v4l2_streamparm * a)720 static int isi_g_parm(struct file *file, void *fh, struct v4l2_streamparm *a)
721 {
722 struct atmel_isi *isi = video_drvdata(file);
723
724 return v4l2_g_parm_cap(video_devdata(file), isi->entity.subdev, a);
725 }
726
isi_s_parm(struct file * file,void * fh,struct v4l2_streamparm * a)727 static int isi_s_parm(struct file *file, void *fh, struct v4l2_streamparm *a)
728 {
729 struct atmel_isi *isi = video_drvdata(file);
730
731 return v4l2_s_parm_cap(video_devdata(file), isi->entity.subdev, a);
732 }
733
isi_enum_framesizes(struct file * file,void * fh,struct v4l2_frmsizeenum * fsize)734 static int isi_enum_framesizes(struct file *file, void *fh,
735 struct v4l2_frmsizeenum *fsize)
736 {
737 struct atmel_isi *isi = video_drvdata(file);
738 const struct isi_format *isi_fmt;
739 struct v4l2_subdev_frame_size_enum fse = {
740 .index = fsize->index,
741 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
742 };
743 int ret;
744
745 isi_fmt = find_format_by_fourcc(isi, fsize->pixel_format);
746 if (!isi_fmt)
747 return -EINVAL;
748
749 fse.code = isi_fmt->mbus_code;
750
751 ret = v4l2_subdev_call(isi->entity.subdev, pad, enum_frame_size,
752 NULL, &fse);
753 if (ret)
754 return ret;
755
756 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
757 fsize->discrete.width = fse.max_width;
758 fsize->discrete.height = fse.max_height;
759
760 return 0;
761 }
762
isi_enum_frameintervals(struct file * file,void * fh,struct v4l2_frmivalenum * fival)763 static int isi_enum_frameintervals(struct file *file, void *fh,
764 struct v4l2_frmivalenum *fival)
765 {
766 struct atmel_isi *isi = video_drvdata(file);
767 const struct isi_format *isi_fmt;
768 struct v4l2_subdev_frame_interval_enum fie = {
769 .index = fival->index,
770 .width = fival->width,
771 .height = fival->height,
772 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
773 };
774 int ret;
775
776 isi_fmt = find_format_by_fourcc(isi, fival->pixel_format);
777 if (!isi_fmt)
778 return -EINVAL;
779
780 fie.code = isi_fmt->mbus_code;
781
782 ret = v4l2_subdev_call(isi->entity.subdev, pad,
783 enum_frame_interval, NULL, &fie);
784 if (ret)
785 return ret;
786
787 fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
788 fival->discrete = fie.interval;
789
790 return 0;
791 }
792
isi_camera_set_bus_param(struct atmel_isi * isi)793 static int isi_camera_set_bus_param(struct atmel_isi *isi)
794 {
795 u32 cfg1 = 0;
796 int ret;
797
798 /* set bus param for ISI */
799 if (isi->pdata.hsync_act_low)
800 cfg1 |= ISI_CFG1_HSYNC_POL_ACTIVE_LOW;
801 if (isi->pdata.vsync_act_low)
802 cfg1 |= ISI_CFG1_VSYNC_POL_ACTIVE_LOW;
803 if (isi->pdata.pclk_act_falling)
804 cfg1 |= ISI_CFG1_PIXCLK_POL_ACTIVE_FALLING;
805 if (isi->pdata.has_emb_sync)
806 cfg1 |= ISI_CFG1_EMB_SYNC;
807 if (isi->pdata.full_mode)
808 cfg1 |= ISI_CFG1_FULL_MODE;
809
810 cfg1 |= ISI_CFG1_THMASK_BEATS_16;
811
812 /* Enable PM and peripheral clock before operate isi registers */
813 ret = pm_runtime_resume_and_get(isi->dev);
814 if (ret < 0)
815 return ret;
816
817 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
818 isi_writel(isi, ISI_CFG1, cfg1);
819
820 pm_runtime_put(isi->dev);
821
822 return 0;
823 }
824
825 /* -----------------------------------------------------------------------*/
atmel_isi_parse_dt(struct atmel_isi * isi,struct platform_device * pdev)826 static int atmel_isi_parse_dt(struct atmel_isi *isi,
827 struct platform_device *pdev)
828 {
829 struct device_node *np = pdev->dev.of_node;
830 struct v4l2_fwnode_endpoint ep = { .bus_type = 0 };
831 int err;
832
833 /* Default settings for ISI */
834 isi->pdata.full_mode = 1;
835 isi->pdata.frate = ISI_CFG1_FRATE_CAPTURE_ALL;
836
837 np = of_graph_get_endpoint_by_regs(np, 0, -1);
838 if (!np) {
839 dev_err(&pdev->dev, "Could not find the endpoint\n");
840 return -EINVAL;
841 }
842
843 err = v4l2_fwnode_endpoint_parse(of_fwnode_handle(np), &ep);
844 of_node_put(np);
845 if (err) {
846 dev_err(&pdev->dev, "Could not parse the endpoint\n");
847 return err;
848 }
849
850 switch (ep.bus.parallel.bus_width) {
851 case 8:
852 isi->pdata.data_width_flags = ISI_DATAWIDTH_8;
853 break;
854 case 10:
855 isi->pdata.data_width_flags =
856 ISI_DATAWIDTH_8 | ISI_DATAWIDTH_10;
857 break;
858 default:
859 dev_err(&pdev->dev, "Unsupported bus width: %d\n",
860 ep.bus.parallel.bus_width);
861 return -EINVAL;
862 }
863
864 if (ep.bus.parallel.flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)
865 isi->pdata.hsync_act_low = true;
866 if (ep.bus.parallel.flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
867 isi->pdata.vsync_act_low = true;
868 if (ep.bus.parallel.flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)
869 isi->pdata.pclk_act_falling = true;
870
871 if (ep.bus_type == V4L2_MBUS_BT656)
872 isi->pdata.has_emb_sync = true;
873
874 return 0;
875 }
876
isi_open(struct file * file)877 static int isi_open(struct file *file)
878 {
879 struct atmel_isi *isi = video_drvdata(file);
880 struct v4l2_subdev *sd = isi->entity.subdev;
881 int ret;
882
883 if (mutex_lock_interruptible(&isi->lock))
884 return -ERESTARTSYS;
885
886 ret = v4l2_fh_open(file);
887 if (ret < 0)
888 goto unlock;
889
890 if (!v4l2_fh_is_singular_file(file))
891 goto fh_rel;
892
893 ret = v4l2_subdev_call(sd, core, s_power, 1);
894 if (ret < 0 && ret != -ENOIOCTLCMD)
895 goto fh_rel;
896
897 ret = isi_set_fmt(isi, &isi->fmt);
898 if (ret)
899 v4l2_subdev_call(sd, core, s_power, 0);
900 fh_rel:
901 if (ret)
902 v4l2_fh_release(file);
903 unlock:
904 mutex_unlock(&isi->lock);
905 return ret;
906 }
907
isi_release(struct file * file)908 static int isi_release(struct file *file)
909 {
910 struct atmel_isi *isi = video_drvdata(file);
911 struct v4l2_subdev *sd = isi->entity.subdev;
912 bool fh_singular;
913 int ret;
914
915 mutex_lock(&isi->lock);
916
917 fh_singular = v4l2_fh_is_singular_file(file);
918
919 ret = _vb2_fop_release(file, NULL);
920
921 if (fh_singular)
922 v4l2_subdev_call(sd, core, s_power, 0);
923
924 mutex_unlock(&isi->lock);
925
926 return ret;
927 }
928
929 static const struct v4l2_ioctl_ops isi_ioctl_ops = {
930 .vidioc_querycap = isi_querycap,
931
932 .vidioc_try_fmt_vid_cap = isi_try_fmt_vid_cap,
933 .vidioc_g_fmt_vid_cap = isi_g_fmt_vid_cap,
934 .vidioc_s_fmt_vid_cap = isi_s_fmt_vid_cap,
935 .vidioc_enum_fmt_vid_cap = isi_enum_fmt_vid_cap,
936
937 .vidioc_enum_input = isi_enum_input,
938 .vidioc_g_input = isi_g_input,
939 .vidioc_s_input = isi_s_input,
940
941 .vidioc_g_parm = isi_g_parm,
942 .vidioc_s_parm = isi_s_parm,
943 .vidioc_enum_framesizes = isi_enum_framesizes,
944 .vidioc_enum_frameintervals = isi_enum_frameintervals,
945
946 .vidioc_reqbufs = vb2_ioctl_reqbufs,
947 .vidioc_create_bufs = vb2_ioctl_create_bufs,
948 .vidioc_querybuf = vb2_ioctl_querybuf,
949 .vidioc_qbuf = vb2_ioctl_qbuf,
950 .vidioc_dqbuf = vb2_ioctl_dqbuf,
951 .vidioc_expbuf = vb2_ioctl_expbuf,
952 .vidioc_prepare_buf = vb2_ioctl_prepare_buf,
953 .vidioc_streamon = vb2_ioctl_streamon,
954 .vidioc_streamoff = vb2_ioctl_streamoff,
955
956 .vidioc_log_status = v4l2_ctrl_log_status,
957 .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
958 .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
959 };
960
961 static const struct v4l2_file_operations isi_fops = {
962 .owner = THIS_MODULE,
963 .unlocked_ioctl = video_ioctl2,
964 .open = isi_open,
965 .release = isi_release,
966 .poll = vb2_fop_poll,
967 .mmap = vb2_fop_mmap,
968 .read = vb2_fop_read,
969 };
970
isi_set_default_fmt(struct atmel_isi * isi)971 static int isi_set_default_fmt(struct atmel_isi *isi)
972 {
973 struct v4l2_format f = {
974 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
975 .fmt.pix = {
976 .width = VGA_WIDTH,
977 .height = VGA_HEIGHT,
978 .field = V4L2_FIELD_NONE,
979 .pixelformat = isi->user_formats[0]->fourcc,
980 },
981 };
982 int ret;
983
984 ret = isi_try_fmt(isi, &f, NULL);
985 if (ret)
986 return ret;
987 isi->current_fmt = isi->user_formats[0];
988 isi->fmt = f;
989 return 0;
990 }
991
992 static const struct isi_format isi_formats[] = {
993 {
994 .fourcc = V4L2_PIX_FMT_YUYV,
995 .mbus_code = MEDIA_BUS_FMT_YUYV8_2X8,
996 .bpp = 2,
997 .swap = ISI_CFG2_YCC_SWAP_DEFAULT,
998 }, {
999 .fourcc = V4L2_PIX_FMT_YUYV,
1000 .mbus_code = MEDIA_BUS_FMT_YVYU8_2X8,
1001 .bpp = 2,
1002 .swap = ISI_CFG2_YCC_SWAP_MODE_1,
1003 }, {
1004 .fourcc = V4L2_PIX_FMT_YUYV,
1005 .mbus_code = MEDIA_BUS_FMT_UYVY8_2X8,
1006 .bpp = 2,
1007 .swap = ISI_CFG2_YCC_SWAP_MODE_2,
1008 }, {
1009 .fourcc = V4L2_PIX_FMT_YUYV,
1010 .mbus_code = MEDIA_BUS_FMT_VYUY8_2X8,
1011 .bpp = 2,
1012 .swap = ISI_CFG2_YCC_SWAP_MODE_3,
1013 }, {
1014 .fourcc = V4L2_PIX_FMT_RGB565,
1015 .mbus_code = MEDIA_BUS_FMT_YUYV8_2X8,
1016 .bpp = 2,
1017 .swap = ISI_CFG2_YCC_SWAP_MODE_2,
1018 }, {
1019 .fourcc = V4L2_PIX_FMT_RGB565,
1020 .mbus_code = MEDIA_BUS_FMT_YVYU8_2X8,
1021 .bpp = 2,
1022 .swap = ISI_CFG2_YCC_SWAP_MODE_3,
1023 }, {
1024 .fourcc = V4L2_PIX_FMT_RGB565,
1025 .mbus_code = MEDIA_BUS_FMT_UYVY8_2X8,
1026 .bpp = 2,
1027 .swap = ISI_CFG2_YCC_SWAP_DEFAULT,
1028 }, {
1029 .fourcc = V4L2_PIX_FMT_RGB565,
1030 .mbus_code = MEDIA_BUS_FMT_VYUY8_2X8,
1031 .bpp = 2,
1032 .swap = ISI_CFG2_YCC_SWAP_MODE_1,
1033 }, {
1034 .fourcc = V4L2_PIX_FMT_GREY,
1035 .mbus_code = MEDIA_BUS_FMT_Y10_1X10,
1036 .bpp = 1,
1037 .swap = ISI_CFG2_GS_MODE_2_PIXEL | ISI_CFG2_GRAYSCALE,
1038 }, {
1039 .fourcc = V4L2_PIX_FMT_Y16,
1040 .mbus_code = MEDIA_BUS_FMT_Y10_1X10,
1041 .bpp = 2,
1042 .swap = ISI_CFG2_GS_MODE_2_PIXEL | ISI_CFG2_GRAYSCALE,
1043 },
1044 };
1045
isi_formats_init(struct atmel_isi * isi)1046 static int isi_formats_init(struct atmel_isi *isi)
1047 {
1048 const struct isi_format *isi_fmts[ARRAY_SIZE(isi_formats)];
1049 unsigned int num_fmts = 0, i, j;
1050 struct v4l2_subdev *subdev = isi->entity.subdev;
1051 struct v4l2_subdev_mbus_code_enum mbus_code = {
1052 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1053 };
1054
1055 while (!v4l2_subdev_call(subdev, pad, enum_mbus_code,
1056 NULL, &mbus_code)) {
1057 for (i = 0; i < ARRAY_SIZE(isi_formats); i++) {
1058 if (isi_formats[i].mbus_code != mbus_code.code)
1059 continue;
1060
1061 /* Code supported, have we got this fourcc yet? */
1062 for (j = 0; j < num_fmts; j++)
1063 if (isi_fmts[j]->fourcc == isi_formats[i].fourcc)
1064 /* Already available */
1065 break;
1066 if (j == num_fmts)
1067 /* new */
1068 isi_fmts[num_fmts++] = isi_formats + i;
1069 }
1070 mbus_code.index++;
1071 }
1072
1073 if (!num_fmts)
1074 return -ENXIO;
1075
1076 isi->num_user_formats = num_fmts;
1077 isi->user_formats = devm_kcalloc(isi->dev,
1078 num_fmts, sizeof(struct isi_format *),
1079 GFP_KERNEL);
1080 if (!isi->user_formats)
1081 return -ENOMEM;
1082
1083 memcpy(isi->user_formats, isi_fmts,
1084 num_fmts * sizeof(struct isi_format *));
1085 isi->current_fmt = isi->user_formats[0];
1086
1087 return 0;
1088 }
1089
isi_graph_notify_complete(struct v4l2_async_notifier * notifier)1090 static int isi_graph_notify_complete(struct v4l2_async_notifier *notifier)
1091 {
1092 struct atmel_isi *isi = notifier_to_isi(notifier);
1093 int ret;
1094
1095 isi->vdev->ctrl_handler = isi->entity.subdev->ctrl_handler;
1096 ret = isi_formats_init(isi);
1097 if (ret) {
1098 dev_err(isi->dev, "No supported mediabus format found\n");
1099 return ret;
1100 }
1101 ret = isi_camera_set_bus_param(isi);
1102 if (ret) {
1103 dev_err(isi->dev, "Can't wake up device\n");
1104 return ret;
1105 }
1106
1107 ret = isi_set_default_fmt(isi);
1108 if (ret) {
1109 dev_err(isi->dev, "Could not set default format\n");
1110 return ret;
1111 }
1112
1113 ret = video_register_device(isi->vdev, VFL_TYPE_VIDEO, -1);
1114 if (ret) {
1115 dev_err(isi->dev, "Failed to register video device\n");
1116 return ret;
1117 }
1118
1119 dev_dbg(isi->dev, "Device registered as %s\n",
1120 video_device_node_name(isi->vdev));
1121 return 0;
1122 }
1123
isi_graph_notify_unbind(struct v4l2_async_notifier * notifier,struct v4l2_subdev * sd,struct v4l2_async_connection * asd)1124 static void isi_graph_notify_unbind(struct v4l2_async_notifier *notifier,
1125 struct v4l2_subdev *sd,
1126 struct v4l2_async_connection *asd)
1127 {
1128 struct atmel_isi *isi = notifier_to_isi(notifier);
1129
1130 dev_dbg(isi->dev, "Removing %s\n", video_device_node_name(isi->vdev));
1131
1132 /* Checks internally if vdev have been init or not */
1133 video_unregister_device(isi->vdev);
1134 }
1135
isi_graph_notify_bound(struct v4l2_async_notifier * notifier,struct v4l2_subdev * subdev,struct v4l2_async_connection * asd)1136 static int isi_graph_notify_bound(struct v4l2_async_notifier *notifier,
1137 struct v4l2_subdev *subdev,
1138 struct v4l2_async_connection *asd)
1139 {
1140 struct atmel_isi *isi = notifier_to_isi(notifier);
1141
1142 dev_dbg(isi->dev, "subdev %s bound\n", subdev->name);
1143
1144 isi->entity.subdev = subdev;
1145
1146 return 0;
1147 }
1148
1149 static const struct v4l2_async_notifier_operations isi_graph_notify_ops = {
1150 .bound = isi_graph_notify_bound,
1151 .unbind = isi_graph_notify_unbind,
1152 .complete = isi_graph_notify_complete,
1153 };
1154
isi_graph_init(struct atmel_isi * isi)1155 static int isi_graph_init(struct atmel_isi *isi)
1156 {
1157 struct v4l2_async_connection *asd;
1158 struct device_node *ep;
1159 int ret;
1160
1161 ep = of_graph_get_endpoint_by_regs(isi->dev->of_node, 0, -1);
1162 if (!ep)
1163 return -EINVAL;
1164
1165 v4l2_async_nf_init(&isi->notifier, &isi->v4l2_dev);
1166
1167 asd = v4l2_async_nf_add_fwnode_remote(&isi->notifier,
1168 of_fwnode_handle(ep),
1169 struct v4l2_async_connection);
1170 of_node_put(ep);
1171
1172 if (IS_ERR(asd))
1173 return PTR_ERR(asd);
1174
1175 isi->notifier.ops = &isi_graph_notify_ops;
1176
1177 ret = v4l2_async_nf_register(&isi->notifier);
1178 if (ret < 0) {
1179 dev_err(isi->dev, "Notifier registration failed\n");
1180 v4l2_async_nf_cleanup(&isi->notifier);
1181 return ret;
1182 }
1183
1184 return 0;
1185 }
1186
1187
atmel_isi_probe(struct platform_device * pdev)1188 static int atmel_isi_probe(struct platform_device *pdev)
1189 {
1190 int irq;
1191 struct atmel_isi *isi;
1192 struct vb2_queue *q;
1193 int ret, i;
1194
1195 isi = devm_kzalloc(&pdev->dev, sizeof(struct atmel_isi), GFP_KERNEL);
1196 if (!isi)
1197 return -ENOMEM;
1198
1199 isi->pclk = devm_clk_get(&pdev->dev, "isi_clk");
1200 if (IS_ERR(isi->pclk))
1201 return PTR_ERR(isi->pclk);
1202
1203 ret = atmel_isi_parse_dt(isi, pdev);
1204 if (ret)
1205 return ret;
1206
1207 isi->active = NULL;
1208 isi->dev = &pdev->dev;
1209 mutex_init(&isi->lock);
1210 spin_lock_init(&isi->irqlock);
1211 INIT_LIST_HEAD(&isi->video_buffer_list);
1212 INIT_LIST_HEAD(&isi->dma_desc_head);
1213
1214 q = &isi->queue;
1215
1216 /* Initialize the top-level structure */
1217 ret = v4l2_device_register(&pdev->dev, &isi->v4l2_dev);
1218 if (ret)
1219 return ret;
1220
1221 isi->vdev = video_device_alloc();
1222 if (!isi->vdev) {
1223 ret = -ENOMEM;
1224 goto err_vdev_alloc;
1225 }
1226
1227 /* video node */
1228 isi->vdev->fops = &isi_fops;
1229 isi->vdev->v4l2_dev = &isi->v4l2_dev;
1230 isi->vdev->queue = &isi->queue;
1231 strscpy(isi->vdev->name, KBUILD_MODNAME, sizeof(isi->vdev->name));
1232 isi->vdev->release = video_device_release;
1233 isi->vdev->ioctl_ops = &isi_ioctl_ops;
1234 isi->vdev->lock = &isi->lock;
1235 isi->vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING |
1236 V4L2_CAP_READWRITE;
1237 video_set_drvdata(isi->vdev, isi);
1238
1239 /* buffer queue */
1240 q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1241 q->io_modes = VB2_MMAP | VB2_READ | VB2_DMABUF;
1242 q->lock = &isi->lock;
1243 q->drv_priv = isi;
1244 q->buf_struct_size = sizeof(struct frame_buffer);
1245 q->ops = &isi_video_qops;
1246 q->mem_ops = &vb2_dma_contig_memops;
1247 q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
1248 q->min_queued_buffers = 2;
1249 q->dev = &pdev->dev;
1250
1251 ret = vb2_queue_init(q);
1252 if (ret < 0) {
1253 dev_err(&pdev->dev, "failed to initialize VB2 queue\n");
1254 goto err_vb2_queue;
1255 }
1256 isi->p_fb_descriptors = dma_alloc_coherent(&pdev->dev,
1257 sizeof(struct fbd) * VIDEO_MAX_FRAME,
1258 &isi->fb_descriptors_phys,
1259 GFP_KERNEL);
1260 if (!isi->p_fb_descriptors) {
1261 dev_err(&pdev->dev, "Can't allocate descriptors!\n");
1262 ret = -ENOMEM;
1263 goto err_dma_alloc;
1264 }
1265
1266 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
1267 isi->dma_desc[i].p_fbd = isi->p_fb_descriptors + i;
1268 isi->dma_desc[i].fbd_phys = isi->fb_descriptors_phys +
1269 i * sizeof(struct fbd);
1270 list_add(&isi->dma_desc[i].list, &isi->dma_desc_head);
1271 }
1272
1273 isi->regs = devm_platform_ioremap_resource(pdev, 0);
1274 if (IS_ERR(isi->regs)) {
1275 ret = PTR_ERR(isi->regs);
1276 goto err_ioremap;
1277 }
1278
1279 if (isi->pdata.data_width_flags & ISI_DATAWIDTH_8)
1280 isi->width_flags = 1 << 7;
1281 if (isi->pdata.data_width_flags & ISI_DATAWIDTH_10)
1282 isi->width_flags |= 1 << 9;
1283
1284 irq = platform_get_irq(pdev, 0);
1285 if (irq < 0) {
1286 ret = irq;
1287 goto err_req_irq;
1288 }
1289
1290 ret = devm_request_irq(&pdev->dev, irq, isi_interrupt, 0, "isi", isi);
1291 if (ret) {
1292 dev_err(&pdev->dev, "Unable to request irq %d\n", irq);
1293 goto err_req_irq;
1294 }
1295 isi->irq = irq;
1296
1297 ret = isi_graph_init(isi);
1298 if (ret < 0)
1299 goto err_req_irq;
1300
1301 pm_suspend_ignore_children(&pdev->dev, true);
1302 pm_runtime_enable(&pdev->dev);
1303 platform_set_drvdata(pdev, isi);
1304 return 0;
1305
1306 err_req_irq:
1307 err_ioremap:
1308 dma_free_coherent(&pdev->dev,
1309 sizeof(struct fbd) * VIDEO_MAX_FRAME,
1310 isi->p_fb_descriptors,
1311 isi->fb_descriptors_phys);
1312 err_dma_alloc:
1313 err_vb2_queue:
1314 video_device_release(isi->vdev);
1315 err_vdev_alloc:
1316 v4l2_device_unregister(&isi->v4l2_dev);
1317
1318 return ret;
1319 }
1320
atmel_isi_remove(struct platform_device * pdev)1321 static void atmel_isi_remove(struct platform_device *pdev)
1322 {
1323 struct atmel_isi *isi = platform_get_drvdata(pdev);
1324
1325 dma_free_coherent(&pdev->dev,
1326 sizeof(struct fbd) * VIDEO_MAX_FRAME,
1327 isi->p_fb_descriptors,
1328 isi->fb_descriptors_phys);
1329 pm_runtime_disable(&pdev->dev);
1330 v4l2_async_nf_unregister(&isi->notifier);
1331 v4l2_async_nf_cleanup(&isi->notifier);
1332 v4l2_device_unregister(&isi->v4l2_dev);
1333 }
1334
1335 #ifdef CONFIG_PM
atmel_isi_runtime_suspend(struct device * dev)1336 static int atmel_isi_runtime_suspend(struct device *dev)
1337 {
1338 struct atmel_isi *isi = dev_get_drvdata(dev);
1339
1340 clk_disable_unprepare(isi->pclk);
1341
1342 return 0;
1343 }
atmel_isi_runtime_resume(struct device * dev)1344 static int atmel_isi_runtime_resume(struct device *dev)
1345 {
1346 struct atmel_isi *isi = dev_get_drvdata(dev);
1347
1348 return clk_prepare_enable(isi->pclk);
1349 }
1350 #endif /* CONFIG_PM */
1351
1352 static const struct dev_pm_ops atmel_isi_dev_pm_ops = {
1353 SET_RUNTIME_PM_OPS(atmel_isi_runtime_suspend,
1354 atmel_isi_runtime_resume, NULL)
1355 };
1356
1357 static const struct of_device_id atmel_isi_of_match[] = {
1358 { .compatible = "atmel,at91sam9g45-isi" },
1359 { }
1360 };
1361 MODULE_DEVICE_TABLE(of, atmel_isi_of_match);
1362
1363 static struct platform_driver atmel_isi_driver = {
1364 .driver = {
1365 .name = "atmel_isi",
1366 .of_match_table = of_match_ptr(atmel_isi_of_match),
1367 .pm = &atmel_isi_dev_pm_ops,
1368 },
1369 .probe = atmel_isi_probe,
1370 .remove_new = atmel_isi_remove,
1371 };
1372
1373 module_platform_driver(atmel_isi_driver);
1374
1375 MODULE_AUTHOR("Josh Wu <josh.wu@atmel.com>");
1376 MODULE_DESCRIPTION("The V4L2 driver for Atmel Linux");
1377 MODULE_LICENSE("GPL");
1378