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 timeout;
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 timeout = wait_for_completion_timeout(&isi->complete,
261 msecs_to_jiffies(500));
262 if (timeout == 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 int ret;
563 struct v4l2_subdev_frame_size_enum fse = {
564 .code = isi_fmt->mbus_code,
565 .which = V4L2_SUBDEV_FORMAT_TRY,
566 };
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 sd_state->pads->try_crop.width = MAX_SUPPORT_WIDTH;
576 sd_state->pads->try_crop.height = MAX_SUPPORT_HEIGHT;
577 } else {
578 sd_state->pads->try_crop.width = fse.max_width;
579 sd_state->pads->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 .pads = &pad_cfg,
591 };
592 struct v4l2_subdev_format format = {
593 .which = V4L2_SUBDEV_FORMAT_TRY,
594 };
595 int ret;
596
597 isi_fmt = find_format_by_fourcc(isi, pixfmt->pixelformat);
598 if (!isi_fmt) {
599 isi_fmt = isi->user_formats[isi->num_user_formats - 1];
600 pixfmt->pixelformat = isi_fmt->fourcc;
601 }
602
603 /* Limit to Atmel ISI hardware capabilities */
604 pixfmt->width = clamp(pixfmt->width, 0U, MAX_SUPPORT_WIDTH);
605 pixfmt->height = clamp(pixfmt->height, 0U, MAX_SUPPORT_HEIGHT);
606
607 v4l2_fill_mbus_format(&format.format, pixfmt, isi_fmt->mbus_code);
608
609 isi_try_fse(isi, isi_fmt, &pad_state);
610
611 ret = v4l2_subdev_call(isi->entity.subdev, pad, set_fmt,
612 &pad_state, &format);
613 if (ret < 0)
614 return ret;
615
616 v4l2_fill_pix_format(pixfmt, &format.format);
617
618 pixfmt->field = V4L2_FIELD_NONE;
619 pixfmt->bytesperline = pixfmt->width * isi_fmt->bpp;
620 pixfmt->sizeimage = pixfmt->bytesperline * pixfmt->height;
621
622 if (current_fmt)
623 *current_fmt = isi_fmt;
624
625 return 0;
626 }
627
isi_set_fmt(struct atmel_isi * isi,struct v4l2_format * f)628 static int isi_set_fmt(struct atmel_isi *isi, struct v4l2_format *f)
629 {
630 struct v4l2_subdev_format format = {
631 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
632 };
633 const struct isi_format *current_fmt;
634 int ret;
635
636 ret = isi_try_fmt(isi, f, ¤t_fmt);
637 if (ret)
638 return ret;
639
640 v4l2_fill_mbus_format(&format.format, &f->fmt.pix,
641 current_fmt->mbus_code);
642 ret = v4l2_subdev_call(isi->entity.subdev, pad,
643 set_fmt, NULL, &format);
644 if (ret < 0)
645 return ret;
646
647 isi->fmt = *f;
648 isi->current_fmt = current_fmt;
649
650 return 0;
651 }
652
isi_s_fmt_vid_cap(struct file * file,void * priv,struct v4l2_format * f)653 static int isi_s_fmt_vid_cap(struct file *file, void *priv,
654 struct v4l2_format *f)
655 {
656 struct atmel_isi *isi = video_drvdata(file);
657
658 if (vb2_is_streaming(&isi->queue))
659 return -EBUSY;
660
661 return isi_set_fmt(isi, f);
662 }
663
isi_try_fmt_vid_cap(struct file * file,void * priv,struct v4l2_format * f)664 static int isi_try_fmt_vid_cap(struct file *file, void *priv,
665 struct v4l2_format *f)
666 {
667 struct atmel_isi *isi = video_drvdata(file);
668
669 return isi_try_fmt(isi, f, NULL);
670 }
671
isi_enum_fmt_vid_cap(struct file * file,void * priv,struct v4l2_fmtdesc * f)672 static int isi_enum_fmt_vid_cap(struct file *file, void *priv,
673 struct v4l2_fmtdesc *f)
674 {
675 struct atmel_isi *isi = video_drvdata(file);
676
677 if (f->index >= isi->num_user_formats)
678 return -EINVAL;
679
680 f->pixelformat = isi->user_formats[f->index]->fourcc;
681 return 0;
682 }
683
isi_querycap(struct file * file,void * priv,struct v4l2_capability * cap)684 static int isi_querycap(struct file *file, void *priv,
685 struct v4l2_capability *cap)
686 {
687 strscpy(cap->driver, "atmel-isi", sizeof(cap->driver));
688 strscpy(cap->card, "Atmel Image Sensor Interface", sizeof(cap->card));
689 strscpy(cap->bus_info, "platform:isi", sizeof(cap->bus_info));
690 return 0;
691 }
692
isi_enum_input(struct file * file,void * priv,struct v4l2_input * i)693 static int isi_enum_input(struct file *file, void *priv,
694 struct v4l2_input *i)
695 {
696 if (i->index != 0)
697 return -EINVAL;
698
699 i->type = V4L2_INPUT_TYPE_CAMERA;
700 strscpy(i->name, "Camera", sizeof(i->name));
701 return 0;
702 }
703
isi_g_input(struct file * file,void * priv,unsigned int * i)704 static int isi_g_input(struct file *file, void *priv, unsigned int *i)
705 {
706 *i = 0;
707 return 0;
708 }
709
isi_s_input(struct file * file,void * priv,unsigned int i)710 static int isi_s_input(struct file *file, void *priv, unsigned int i)
711 {
712 if (i > 0)
713 return -EINVAL;
714 return 0;
715 }
716
isi_g_parm(struct file * file,void * fh,struct v4l2_streamparm * a)717 static int isi_g_parm(struct file *file, void *fh, struct v4l2_streamparm *a)
718 {
719 struct atmel_isi *isi = video_drvdata(file);
720
721 return v4l2_g_parm_cap(video_devdata(file), isi->entity.subdev, a);
722 }
723
isi_s_parm(struct file * file,void * fh,struct v4l2_streamparm * a)724 static int isi_s_parm(struct file *file, void *fh, struct v4l2_streamparm *a)
725 {
726 struct atmel_isi *isi = video_drvdata(file);
727
728 return v4l2_s_parm_cap(video_devdata(file), isi->entity.subdev, a);
729 }
730
isi_enum_framesizes(struct file * file,void * fh,struct v4l2_frmsizeenum * fsize)731 static int isi_enum_framesizes(struct file *file, void *fh,
732 struct v4l2_frmsizeenum *fsize)
733 {
734 struct atmel_isi *isi = video_drvdata(file);
735 const struct isi_format *isi_fmt;
736 struct v4l2_subdev_frame_size_enum fse = {
737 .index = fsize->index,
738 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
739 };
740 int ret;
741
742 isi_fmt = find_format_by_fourcc(isi, fsize->pixel_format);
743 if (!isi_fmt)
744 return -EINVAL;
745
746 fse.code = isi_fmt->mbus_code;
747
748 ret = v4l2_subdev_call(isi->entity.subdev, pad, enum_frame_size,
749 NULL, &fse);
750 if (ret)
751 return ret;
752
753 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
754 fsize->discrete.width = fse.max_width;
755 fsize->discrete.height = fse.max_height;
756
757 return 0;
758 }
759
isi_enum_frameintervals(struct file * file,void * fh,struct v4l2_frmivalenum * fival)760 static int isi_enum_frameintervals(struct file *file, void *fh,
761 struct v4l2_frmivalenum *fival)
762 {
763 struct atmel_isi *isi = video_drvdata(file);
764 const struct isi_format *isi_fmt;
765 struct v4l2_subdev_frame_interval_enum fie = {
766 .index = fival->index,
767 .width = fival->width,
768 .height = fival->height,
769 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
770 };
771 int ret;
772
773 isi_fmt = find_format_by_fourcc(isi, fival->pixel_format);
774 if (!isi_fmt)
775 return -EINVAL;
776
777 fie.code = isi_fmt->mbus_code;
778
779 ret = v4l2_subdev_call(isi->entity.subdev, pad,
780 enum_frame_interval, NULL, &fie);
781 if (ret)
782 return ret;
783
784 fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
785 fival->discrete = fie.interval;
786
787 return 0;
788 }
789
isi_camera_set_bus_param(struct atmel_isi * isi)790 static int isi_camera_set_bus_param(struct atmel_isi *isi)
791 {
792 u32 cfg1 = 0;
793 int ret;
794
795 /* set bus param for ISI */
796 if (isi->pdata.hsync_act_low)
797 cfg1 |= ISI_CFG1_HSYNC_POL_ACTIVE_LOW;
798 if (isi->pdata.vsync_act_low)
799 cfg1 |= ISI_CFG1_VSYNC_POL_ACTIVE_LOW;
800 if (isi->pdata.pclk_act_falling)
801 cfg1 |= ISI_CFG1_PIXCLK_POL_ACTIVE_FALLING;
802 if (isi->pdata.has_emb_sync)
803 cfg1 |= ISI_CFG1_EMB_SYNC;
804 if (isi->pdata.full_mode)
805 cfg1 |= ISI_CFG1_FULL_MODE;
806
807 cfg1 |= ISI_CFG1_THMASK_BEATS_16;
808
809 /* Enable PM and peripheral clock before operate isi registers */
810 ret = pm_runtime_resume_and_get(isi->dev);
811 if (ret < 0)
812 return ret;
813
814 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
815 isi_writel(isi, ISI_CFG1, cfg1);
816
817 pm_runtime_put(isi->dev);
818
819 return 0;
820 }
821
822 /* -----------------------------------------------------------------------*/
atmel_isi_parse_dt(struct atmel_isi * isi,struct platform_device * pdev)823 static int atmel_isi_parse_dt(struct atmel_isi *isi,
824 struct platform_device *pdev)
825 {
826 struct device_node *np = pdev->dev.of_node;
827 struct v4l2_fwnode_endpoint ep = { .bus_type = 0 };
828 int err;
829
830 /* Default settings for ISI */
831 isi->pdata.full_mode = 1;
832 isi->pdata.frate = ISI_CFG1_FRATE_CAPTURE_ALL;
833
834 np = of_graph_get_next_endpoint(np, NULL);
835 if (!np) {
836 dev_err(&pdev->dev, "Could not find the endpoint\n");
837 return -EINVAL;
838 }
839
840 err = v4l2_fwnode_endpoint_parse(of_fwnode_handle(np), &ep);
841 of_node_put(np);
842 if (err) {
843 dev_err(&pdev->dev, "Could not parse the endpoint\n");
844 return err;
845 }
846
847 switch (ep.bus.parallel.bus_width) {
848 case 8:
849 isi->pdata.data_width_flags = ISI_DATAWIDTH_8;
850 break;
851 case 10:
852 isi->pdata.data_width_flags =
853 ISI_DATAWIDTH_8 | ISI_DATAWIDTH_10;
854 break;
855 default:
856 dev_err(&pdev->dev, "Unsupported bus width: %d\n",
857 ep.bus.parallel.bus_width);
858 return -EINVAL;
859 }
860
861 if (ep.bus.parallel.flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)
862 isi->pdata.hsync_act_low = true;
863 if (ep.bus.parallel.flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
864 isi->pdata.vsync_act_low = true;
865 if (ep.bus.parallel.flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)
866 isi->pdata.pclk_act_falling = true;
867
868 if (ep.bus_type == V4L2_MBUS_BT656)
869 isi->pdata.has_emb_sync = true;
870
871 return 0;
872 }
873
isi_open(struct file * file)874 static int isi_open(struct file *file)
875 {
876 struct atmel_isi *isi = video_drvdata(file);
877 struct v4l2_subdev *sd = isi->entity.subdev;
878 int ret;
879
880 if (mutex_lock_interruptible(&isi->lock))
881 return -ERESTARTSYS;
882
883 ret = v4l2_fh_open(file);
884 if (ret < 0)
885 goto unlock;
886
887 if (!v4l2_fh_is_singular_file(file))
888 goto fh_rel;
889
890 ret = v4l2_subdev_call(sd, core, s_power, 1);
891 if (ret < 0 && ret != -ENOIOCTLCMD)
892 goto fh_rel;
893
894 ret = isi_set_fmt(isi, &isi->fmt);
895 if (ret)
896 v4l2_subdev_call(sd, core, s_power, 0);
897 fh_rel:
898 if (ret)
899 v4l2_fh_release(file);
900 unlock:
901 mutex_unlock(&isi->lock);
902 return ret;
903 }
904
isi_release(struct file * file)905 static int isi_release(struct file *file)
906 {
907 struct atmel_isi *isi = video_drvdata(file);
908 struct v4l2_subdev *sd = isi->entity.subdev;
909 bool fh_singular;
910 int ret;
911
912 mutex_lock(&isi->lock);
913
914 fh_singular = v4l2_fh_is_singular_file(file);
915
916 ret = _vb2_fop_release(file, NULL);
917
918 if (fh_singular)
919 v4l2_subdev_call(sd, core, s_power, 0);
920
921 mutex_unlock(&isi->lock);
922
923 return ret;
924 }
925
926 static const struct v4l2_ioctl_ops isi_ioctl_ops = {
927 .vidioc_querycap = isi_querycap,
928
929 .vidioc_try_fmt_vid_cap = isi_try_fmt_vid_cap,
930 .vidioc_g_fmt_vid_cap = isi_g_fmt_vid_cap,
931 .vidioc_s_fmt_vid_cap = isi_s_fmt_vid_cap,
932 .vidioc_enum_fmt_vid_cap = isi_enum_fmt_vid_cap,
933
934 .vidioc_enum_input = isi_enum_input,
935 .vidioc_g_input = isi_g_input,
936 .vidioc_s_input = isi_s_input,
937
938 .vidioc_g_parm = isi_g_parm,
939 .vidioc_s_parm = isi_s_parm,
940 .vidioc_enum_framesizes = isi_enum_framesizes,
941 .vidioc_enum_frameintervals = isi_enum_frameintervals,
942
943 .vidioc_reqbufs = vb2_ioctl_reqbufs,
944 .vidioc_create_bufs = vb2_ioctl_create_bufs,
945 .vidioc_querybuf = vb2_ioctl_querybuf,
946 .vidioc_qbuf = vb2_ioctl_qbuf,
947 .vidioc_dqbuf = vb2_ioctl_dqbuf,
948 .vidioc_expbuf = vb2_ioctl_expbuf,
949 .vidioc_prepare_buf = vb2_ioctl_prepare_buf,
950 .vidioc_streamon = vb2_ioctl_streamon,
951 .vidioc_streamoff = vb2_ioctl_streamoff,
952
953 .vidioc_log_status = v4l2_ctrl_log_status,
954 .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
955 .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
956 };
957
958 static const struct v4l2_file_operations isi_fops = {
959 .owner = THIS_MODULE,
960 .unlocked_ioctl = video_ioctl2,
961 .open = isi_open,
962 .release = isi_release,
963 .poll = vb2_fop_poll,
964 .mmap = vb2_fop_mmap,
965 .read = vb2_fop_read,
966 };
967
isi_set_default_fmt(struct atmel_isi * isi)968 static int isi_set_default_fmt(struct atmel_isi *isi)
969 {
970 struct v4l2_format f = {
971 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
972 .fmt.pix = {
973 .width = VGA_WIDTH,
974 .height = VGA_HEIGHT,
975 .field = V4L2_FIELD_NONE,
976 .pixelformat = isi->user_formats[0]->fourcc,
977 },
978 };
979 int ret;
980
981 ret = isi_try_fmt(isi, &f, NULL);
982 if (ret)
983 return ret;
984 isi->current_fmt = isi->user_formats[0];
985 isi->fmt = f;
986 return 0;
987 }
988
989 static const struct isi_format isi_formats[] = {
990 {
991 .fourcc = V4L2_PIX_FMT_YUYV,
992 .mbus_code = MEDIA_BUS_FMT_YUYV8_2X8,
993 .bpp = 2,
994 .swap = ISI_CFG2_YCC_SWAP_DEFAULT,
995 }, {
996 .fourcc = V4L2_PIX_FMT_YUYV,
997 .mbus_code = MEDIA_BUS_FMT_YVYU8_2X8,
998 .bpp = 2,
999 .swap = ISI_CFG2_YCC_SWAP_MODE_1,
1000 }, {
1001 .fourcc = V4L2_PIX_FMT_YUYV,
1002 .mbus_code = MEDIA_BUS_FMT_UYVY8_2X8,
1003 .bpp = 2,
1004 .swap = ISI_CFG2_YCC_SWAP_MODE_2,
1005 }, {
1006 .fourcc = V4L2_PIX_FMT_YUYV,
1007 .mbus_code = MEDIA_BUS_FMT_VYUY8_2X8,
1008 .bpp = 2,
1009 .swap = ISI_CFG2_YCC_SWAP_MODE_3,
1010 }, {
1011 .fourcc = V4L2_PIX_FMT_RGB565,
1012 .mbus_code = MEDIA_BUS_FMT_YUYV8_2X8,
1013 .bpp = 2,
1014 .swap = ISI_CFG2_YCC_SWAP_MODE_2,
1015 }, {
1016 .fourcc = V4L2_PIX_FMT_RGB565,
1017 .mbus_code = MEDIA_BUS_FMT_YVYU8_2X8,
1018 .bpp = 2,
1019 .swap = ISI_CFG2_YCC_SWAP_MODE_3,
1020 }, {
1021 .fourcc = V4L2_PIX_FMT_RGB565,
1022 .mbus_code = MEDIA_BUS_FMT_UYVY8_2X8,
1023 .bpp = 2,
1024 .swap = ISI_CFG2_YCC_SWAP_DEFAULT,
1025 }, {
1026 .fourcc = V4L2_PIX_FMT_RGB565,
1027 .mbus_code = MEDIA_BUS_FMT_VYUY8_2X8,
1028 .bpp = 2,
1029 .swap = ISI_CFG2_YCC_SWAP_MODE_1,
1030 }, {
1031 .fourcc = V4L2_PIX_FMT_GREY,
1032 .mbus_code = MEDIA_BUS_FMT_Y10_1X10,
1033 .bpp = 1,
1034 .swap = ISI_CFG2_GS_MODE_2_PIXEL | ISI_CFG2_GRAYSCALE,
1035 }, {
1036 .fourcc = V4L2_PIX_FMT_Y16,
1037 .mbus_code = MEDIA_BUS_FMT_Y10_1X10,
1038 .bpp = 2,
1039 .swap = ISI_CFG2_GS_MODE_2_PIXEL | ISI_CFG2_GRAYSCALE,
1040 },
1041 };
1042
isi_formats_init(struct atmel_isi * isi)1043 static int isi_formats_init(struct atmel_isi *isi)
1044 {
1045 const struct isi_format *isi_fmts[ARRAY_SIZE(isi_formats)];
1046 unsigned int num_fmts = 0, i, j;
1047 struct v4l2_subdev *subdev = isi->entity.subdev;
1048 struct v4l2_subdev_mbus_code_enum mbus_code = {
1049 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1050 };
1051
1052 while (!v4l2_subdev_call(subdev, pad, enum_mbus_code,
1053 NULL, &mbus_code)) {
1054 for (i = 0; i < ARRAY_SIZE(isi_formats); i++) {
1055 if (isi_formats[i].mbus_code != mbus_code.code)
1056 continue;
1057
1058 /* Code supported, have we got this fourcc yet? */
1059 for (j = 0; j < num_fmts; j++)
1060 if (isi_fmts[j]->fourcc == isi_formats[i].fourcc)
1061 /* Already available */
1062 break;
1063 if (j == num_fmts)
1064 /* new */
1065 isi_fmts[num_fmts++] = isi_formats + i;
1066 }
1067 mbus_code.index++;
1068 }
1069
1070 if (!num_fmts)
1071 return -ENXIO;
1072
1073 isi->num_user_formats = num_fmts;
1074 isi->user_formats = devm_kcalloc(isi->dev,
1075 num_fmts, sizeof(struct isi_format *),
1076 GFP_KERNEL);
1077 if (!isi->user_formats)
1078 return -ENOMEM;
1079
1080 memcpy(isi->user_formats, isi_fmts,
1081 num_fmts * sizeof(struct isi_format *));
1082 isi->current_fmt = isi->user_formats[0];
1083
1084 return 0;
1085 }
1086
isi_graph_notify_complete(struct v4l2_async_notifier * notifier)1087 static int isi_graph_notify_complete(struct v4l2_async_notifier *notifier)
1088 {
1089 struct atmel_isi *isi = notifier_to_isi(notifier);
1090 int ret;
1091
1092 isi->vdev->ctrl_handler = isi->entity.subdev->ctrl_handler;
1093 ret = isi_formats_init(isi);
1094 if (ret) {
1095 dev_err(isi->dev, "No supported mediabus format found\n");
1096 return ret;
1097 }
1098 ret = isi_camera_set_bus_param(isi);
1099 if (ret) {
1100 dev_err(isi->dev, "Can't wake up device\n");
1101 return ret;
1102 }
1103
1104 ret = isi_set_default_fmt(isi);
1105 if (ret) {
1106 dev_err(isi->dev, "Could not set default format\n");
1107 return ret;
1108 }
1109
1110 ret = video_register_device(isi->vdev, VFL_TYPE_VIDEO, -1);
1111 if (ret) {
1112 dev_err(isi->dev, "Failed to register video device\n");
1113 return ret;
1114 }
1115
1116 dev_dbg(isi->dev, "Device registered as %s\n",
1117 video_device_node_name(isi->vdev));
1118 return 0;
1119 }
1120
isi_graph_notify_unbind(struct v4l2_async_notifier * notifier,struct v4l2_subdev * sd,struct v4l2_async_connection * asd)1121 static void isi_graph_notify_unbind(struct v4l2_async_notifier *notifier,
1122 struct v4l2_subdev *sd,
1123 struct v4l2_async_connection *asd)
1124 {
1125 struct atmel_isi *isi = notifier_to_isi(notifier);
1126
1127 dev_dbg(isi->dev, "Removing %s\n", video_device_node_name(isi->vdev));
1128
1129 /* Checks internally if vdev have been init or not */
1130 video_unregister_device(isi->vdev);
1131 }
1132
isi_graph_notify_bound(struct v4l2_async_notifier * notifier,struct v4l2_subdev * subdev,struct v4l2_async_connection * asd)1133 static int isi_graph_notify_bound(struct v4l2_async_notifier *notifier,
1134 struct v4l2_subdev *subdev,
1135 struct v4l2_async_connection *asd)
1136 {
1137 struct atmel_isi *isi = notifier_to_isi(notifier);
1138
1139 dev_dbg(isi->dev, "subdev %s bound\n", subdev->name);
1140
1141 isi->entity.subdev = subdev;
1142
1143 return 0;
1144 }
1145
1146 static const struct v4l2_async_notifier_operations isi_graph_notify_ops = {
1147 .bound = isi_graph_notify_bound,
1148 .unbind = isi_graph_notify_unbind,
1149 .complete = isi_graph_notify_complete,
1150 };
1151
isi_graph_init(struct atmel_isi * isi)1152 static int isi_graph_init(struct atmel_isi *isi)
1153 {
1154 struct v4l2_async_connection *asd;
1155 struct device_node *ep;
1156 int ret;
1157
1158 ep = of_graph_get_next_endpoint(isi->dev->of_node, NULL);
1159 if (!ep)
1160 return -EINVAL;
1161
1162 v4l2_async_nf_init(&isi->notifier, &isi->v4l2_dev);
1163
1164 asd = v4l2_async_nf_add_fwnode_remote(&isi->notifier,
1165 of_fwnode_handle(ep),
1166 struct v4l2_async_connection);
1167 of_node_put(ep);
1168
1169 if (IS_ERR(asd))
1170 return PTR_ERR(asd);
1171
1172 isi->notifier.ops = &isi_graph_notify_ops;
1173
1174 ret = v4l2_async_nf_register(&isi->notifier);
1175 if (ret < 0) {
1176 dev_err(isi->dev, "Notifier registration failed\n");
1177 v4l2_async_nf_cleanup(&isi->notifier);
1178 return ret;
1179 }
1180
1181 return 0;
1182 }
1183
1184
atmel_isi_probe(struct platform_device * pdev)1185 static int atmel_isi_probe(struct platform_device *pdev)
1186 {
1187 int irq;
1188 struct atmel_isi *isi;
1189 struct vb2_queue *q;
1190 int ret, i;
1191
1192 isi = devm_kzalloc(&pdev->dev, sizeof(struct atmel_isi), GFP_KERNEL);
1193 if (!isi)
1194 return -ENOMEM;
1195
1196 isi->pclk = devm_clk_get(&pdev->dev, "isi_clk");
1197 if (IS_ERR(isi->pclk))
1198 return PTR_ERR(isi->pclk);
1199
1200 ret = atmel_isi_parse_dt(isi, pdev);
1201 if (ret)
1202 return ret;
1203
1204 isi->active = NULL;
1205 isi->dev = &pdev->dev;
1206 mutex_init(&isi->lock);
1207 spin_lock_init(&isi->irqlock);
1208 INIT_LIST_HEAD(&isi->video_buffer_list);
1209 INIT_LIST_HEAD(&isi->dma_desc_head);
1210
1211 q = &isi->queue;
1212
1213 /* Initialize the top-level structure */
1214 ret = v4l2_device_register(&pdev->dev, &isi->v4l2_dev);
1215 if (ret)
1216 return ret;
1217
1218 isi->vdev = video_device_alloc();
1219 if (!isi->vdev) {
1220 ret = -ENOMEM;
1221 goto err_vdev_alloc;
1222 }
1223
1224 /* video node */
1225 isi->vdev->fops = &isi_fops;
1226 isi->vdev->v4l2_dev = &isi->v4l2_dev;
1227 isi->vdev->queue = &isi->queue;
1228 strscpy(isi->vdev->name, KBUILD_MODNAME, sizeof(isi->vdev->name));
1229 isi->vdev->release = video_device_release;
1230 isi->vdev->ioctl_ops = &isi_ioctl_ops;
1231 isi->vdev->lock = &isi->lock;
1232 isi->vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING |
1233 V4L2_CAP_READWRITE;
1234 video_set_drvdata(isi->vdev, isi);
1235
1236 /* buffer queue */
1237 q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1238 q->io_modes = VB2_MMAP | VB2_READ | VB2_DMABUF;
1239 q->lock = &isi->lock;
1240 q->drv_priv = isi;
1241 q->buf_struct_size = sizeof(struct frame_buffer);
1242 q->ops = &isi_video_qops;
1243 q->mem_ops = &vb2_dma_contig_memops;
1244 q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
1245 q->min_buffers_needed = 2;
1246 q->dev = &pdev->dev;
1247
1248 ret = vb2_queue_init(q);
1249 if (ret < 0) {
1250 dev_err(&pdev->dev, "failed to initialize VB2 queue\n");
1251 goto err_vb2_queue;
1252 }
1253 isi->p_fb_descriptors = dma_alloc_coherent(&pdev->dev,
1254 sizeof(struct fbd) * VIDEO_MAX_FRAME,
1255 &isi->fb_descriptors_phys,
1256 GFP_KERNEL);
1257 if (!isi->p_fb_descriptors) {
1258 dev_err(&pdev->dev, "Can't allocate descriptors!\n");
1259 ret = -ENOMEM;
1260 goto err_dma_alloc;
1261 }
1262
1263 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
1264 isi->dma_desc[i].p_fbd = isi->p_fb_descriptors + i;
1265 isi->dma_desc[i].fbd_phys = isi->fb_descriptors_phys +
1266 i * sizeof(struct fbd);
1267 list_add(&isi->dma_desc[i].list, &isi->dma_desc_head);
1268 }
1269
1270 isi->regs = devm_platform_ioremap_resource(pdev, 0);
1271 if (IS_ERR(isi->regs)) {
1272 ret = PTR_ERR(isi->regs);
1273 goto err_ioremap;
1274 }
1275
1276 if (isi->pdata.data_width_flags & ISI_DATAWIDTH_8)
1277 isi->width_flags = 1 << 7;
1278 if (isi->pdata.data_width_flags & ISI_DATAWIDTH_10)
1279 isi->width_flags |= 1 << 9;
1280
1281 irq = platform_get_irq(pdev, 0);
1282 if (irq < 0) {
1283 ret = irq;
1284 goto err_req_irq;
1285 }
1286
1287 ret = devm_request_irq(&pdev->dev, irq, isi_interrupt, 0, "isi", isi);
1288 if (ret) {
1289 dev_err(&pdev->dev, "Unable to request irq %d\n", irq);
1290 goto err_req_irq;
1291 }
1292 isi->irq = irq;
1293
1294 ret = isi_graph_init(isi);
1295 if (ret < 0)
1296 goto err_req_irq;
1297
1298 pm_suspend_ignore_children(&pdev->dev, true);
1299 pm_runtime_enable(&pdev->dev);
1300 platform_set_drvdata(pdev, isi);
1301 return 0;
1302
1303 err_req_irq:
1304 err_ioremap:
1305 dma_free_coherent(&pdev->dev,
1306 sizeof(struct fbd) * VIDEO_MAX_FRAME,
1307 isi->p_fb_descriptors,
1308 isi->fb_descriptors_phys);
1309 err_dma_alloc:
1310 err_vb2_queue:
1311 video_device_release(isi->vdev);
1312 err_vdev_alloc:
1313 v4l2_device_unregister(&isi->v4l2_dev);
1314
1315 return ret;
1316 }
1317
atmel_isi_remove(struct platform_device * pdev)1318 static void atmel_isi_remove(struct platform_device *pdev)
1319 {
1320 struct atmel_isi *isi = platform_get_drvdata(pdev);
1321
1322 dma_free_coherent(&pdev->dev,
1323 sizeof(struct fbd) * VIDEO_MAX_FRAME,
1324 isi->p_fb_descriptors,
1325 isi->fb_descriptors_phys);
1326 pm_runtime_disable(&pdev->dev);
1327 v4l2_async_nf_unregister(&isi->notifier);
1328 v4l2_async_nf_cleanup(&isi->notifier);
1329 v4l2_device_unregister(&isi->v4l2_dev);
1330 }
1331
1332 #ifdef CONFIG_PM
atmel_isi_runtime_suspend(struct device * dev)1333 static int atmel_isi_runtime_suspend(struct device *dev)
1334 {
1335 struct atmel_isi *isi = dev_get_drvdata(dev);
1336
1337 clk_disable_unprepare(isi->pclk);
1338
1339 return 0;
1340 }
atmel_isi_runtime_resume(struct device * dev)1341 static int atmel_isi_runtime_resume(struct device *dev)
1342 {
1343 struct atmel_isi *isi = dev_get_drvdata(dev);
1344
1345 return clk_prepare_enable(isi->pclk);
1346 }
1347 #endif /* CONFIG_PM */
1348
1349 static const struct dev_pm_ops atmel_isi_dev_pm_ops = {
1350 SET_RUNTIME_PM_OPS(atmel_isi_runtime_suspend,
1351 atmel_isi_runtime_resume, NULL)
1352 };
1353
1354 static const struct of_device_id atmel_isi_of_match[] = {
1355 { .compatible = "atmel,at91sam9g45-isi" },
1356 { }
1357 };
1358 MODULE_DEVICE_TABLE(of, atmel_isi_of_match);
1359
1360 static struct platform_driver atmel_isi_driver = {
1361 .driver = {
1362 .name = "atmel_isi",
1363 .of_match_table = of_match_ptr(atmel_isi_of_match),
1364 .pm = &atmel_isi_dev_pm_ops,
1365 },
1366 .probe = atmel_isi_probe,
1367 .remove_new = atmel_isi_remove,
1368 };
1369
1370 module_platform_driver(atmel_isi_driver);
1371
1372 MODULE_AUTHOR("Josh Wu <josh.wu@atmel.com>");
1373 MODULE_DESCRIPTION("The V4L2 driver for Atmel Linux");
1374 MODULE_LICENSE("GPL");
1375