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Merge tag 'md/4.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md
[deliverable/linux.git] / drivers / media / platform / soc_camera / atmel-isi.c
1 /*
2 * Copyright (c) 2011 Atmel Corporation
3 * Josh Wu, <josh.wu@atmel.com>
4 *
5 * Based on previous work by Lars Haring, <lars.haring@atmel.com>
6 * and Sedji Gaouaou
7 * Based on the bttv driver for Bt848 with respective copyright holders
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14 #include <linux/clk.h>
15 #include <linux/completion.h>
16 #include <linux/delay.h>
17 #include <linux/fs.h>
18 #include <linux/init.h>
19 #include <linux/interrupt.h>
20 #include <linux/kernel.h>
21 #include <linux/module.h>
22 #include <linux/platform_device.h>
23 #include <linux/pm_runtime.h>
24 #include <linux/slab.h>
25
26 #include <media/soc_camera.h>
27 #include <media/drv-intf/soc_mediabus.h>
28 #include <media/v4l2-of.h>
29 #include <media/videobuf2-dma-contig.h>
30
31 #include "atmel-isi.h"
32
33 #define MAX_BUFFER_NUM 32
34 #define MAX_SUPPORT_WIDTH 2048
35 #define MAX_SUPPORT_HEIGHT 2048
36 #define VID_LIMIT_BYTES (16 * 1024 * 1024)
37 #define MIN_FRAME_RATE 15
38 #define FRAME_INTERVAL_MILLI_SEC (1000 / MIN_FRAME_RATE)
39
40 /* Frame buffer descriptor */
41 struct fbd {
42 /* Physical address of the frame buffer */
43 u32 fb_address;
44 /* DMA Control Register(only in HISI2) */
45 u32 dma_ctrl;
46 /* Physical address of the next fbd */
47 u32 next_fbd_address;
48 };
49
50 static void set_dma_ctrl(struct fbd *fb_desc, u32 ctrl)
51 {
52 fb_desc->dma_ctrl = ctrl;
53 }
54
55 struct isi_dma_desc {
56 struct list_head list;
57 struct fbd *p_fbd;
58 dma_addr_t fbd_phys;
59 };
60
61 /* Frame buffer data */
62 struct frame_buffer {
63 struct vb2_v4l2_buffer vb;
64 struct isi_dma_desc *p_dma_desc;
65 struct list_head list;
66 };
67
68 struct atmel_isi {
69 /* Protects the access of variables shared with the ISR */
70 spinlock_t lock;
71 void __iomem *regs;
72
73 int sequence;
74
75 struct vb2_alloc_ctx *alloc_ctx;
76
77 /* Allocate descriptors for dma buffer use */
78 struct fbd *p_fb_descriptors;
79 dma_addr_t fb_descriptors_phys;
80 struct list_head dma_desc_head;
81 struct isi_dma_desc dma_desc[MAX_BUFFER_NUM];
82 bool enable_preview_path;
83
84 struct completion complete;
85 /* ISI peripherial clock */
86 struct clk *pclk;
87 unsigned int irq;
88
89 struct isi_platform_data pdata;
90 u16 width_flags; /* max 12 bits */
91
92 struct list_head video_buffer_list;
93 struct frame_buffer *active;
94
95 struct soc_camera_host soc_host;
96 };
97
98 static void isi_writel(struct atmel_isi *isi, u32 reg, u32 val)
99 {
100 writel(val, isi->regs + reg);
101 }
102 static u32 isi_readl(struct atmel_isi *isi, u32 reg)
103 {
104 return readl(isi->regs + reg);
105 }
106
107 static u32 setup_cfg2_yuv_swap(struct atmel_isi *isi,
108 const struct soc_camera_format_xlate *xlate)
109 {
110 if (xlate->host_fmt->fourcc == V4L2_PIX_FMT_YUYV) {
111 /* all convert to YUYV */
112 switch (xlate->code) {
113 case MEDIA_BUS_FMT_VYUY8_2X8:
114 return ISI_CFG2_YCC_SWAP_MODE_3;
115 case MEDIA_BUS_FMT_UYVY8_2X8:
116 return ISI_CFG2_YCC_SWAP_MODE_2;
117 case MEDIA_BUS_FMT_YVYU8_2X8:
118 return ISI_CFG2_YCC_SWAP_MODE_1;
119 }
120 } else if (xlate->host_fmt->fourcc == V4L2_PIX_FMT_RGB565) {
121 /*
122 * Preview path is enabled, it will convert UYVY to RGB format.
123 * But if sensor output format is not UYVY, we need to set
124 * YCC_SWAP_MODE to convert it as UYVY.
125 */
126 switch (xlate->code) {
127 case MEDIA_BUS_FMT_VYUY8_2X8:
128 return ISI_CFG2_YCC_SWAP_MODE_1;
129 case MEDIA_BUS_FMT_YUYV8_2X8:
130 return ISI_CFG2_YCC_SWAP_MODE_2;
131 case MEDIA_BUS_FMT_YVYU8_2X8:
132 return ISI_CFG2_YCC_SWAP_MODE_3;
133 }
134 }
135
136 /*
137 * By default, no swap for the codec path of Atmel ISI. So codec
138 * output is same as sensor's output.
139 * For instance, if sensor's output is YUYV, then codec outputs YUYV.
140 * And if sensor's output is UYVY, then codec outputs UYVY.
141 */
142 return ISI_CFG2_YCC_SWAP_DEFAULT;
143 }
144
145 static void configure_geometry(struct atmel_isi *isi, u32 width,
146 u32 height, const struct soc_camera_format_xlate *xlate)
147 {
148 u32 cfg2, psize;
149 u32 fourcc = xlate->host_fmt->fourcc;
150
151 isi->enable_preview_path = fourcc == V4L2_PIX_FMT_RGB565 ||
152 fourcc == V4L2_PIX_FMT_RGB32;
153
154 /* According to sensor's output format to set cfg2 */
155 switch (xlate->code) {
156 default:
157 /* Grey */
158 case MEDIA_BUS_FMT_Y8_1X8:
159 cfg2 = ISI_CFG2_GRAYSCALE | ISI_CFG2_COL_SPACE_YCbCr;
160 break;
161 /* YUV */
162 case MEDIA_BUS_FMT_VYUY8_2X8:
163 case MEDIA_BUS_FMT_UYVY8_2X8:
164 case MEDIA_BUS_FMT_YVYU8_2X8:
165 case MEDIA_BUS_FMT_YUYV8_2X8:
166 cfg2 = ISI_CFG2_COL_SPACE_YCbCr |
167 setup_cfg2_yuv_swap(isi, xlate);
168 break;
169 /* RGB, TODO */
170 }
171
172 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
173 /* Set width */
174 cfg2 |= ((width - 1) << ISI_CFG2_IM_HSIZE_OFFSET) &
175 ISI_CFG2_IM_HSIZE_MASK;
176 /* Set height */
177 cfg2 |= ((height - 1) << ISI_CFG2_IM_VSIZE_OFFSET)
178 & ISI_CFG2_IM_VSIZE_MASK;
179 isi_writel(isi, ISI_CFG2, cfg2);
180
181 /* No down sampling, preview size equal to sensor output size */
182 psize = ((width - 1) << ISI_PSIZE_PREV_HSIZE_OFFSET) &
183 ISI_PSIZE_PREV_HSIZE_MASK;
184 psize |= ((height - 1) << ISI_PSIZE_PREV_VSIZE_OFFSET) &
185 ISI_PSIZE_PREV_VSIZE_MASK;
186 isi_writel(isi, ISI_PSIZE, psize);
187 isi_writel(isi, ISI_PDECF, ISI_PDECF_NO_SAMPLING);
188
189 return;
190 }
191
192 static bool is_supported(struct soc_camera_device *icd,
193 const u32 pixformat)
194 {
195 switch (pixformat) {
196 /* YUV, including grey */
197 case V4L2_PIX_FMT_GREY:
198 case V4L2_PIX_FMT_YUYV:
199 case V4L2_PIX_FMT_UYVY:
200 case V4L2_PIX_FMT_YVYU:
201 case V4L2_PIX_FMT_VYUY:
202 /* RGB */
203 case V4L2_PIX_FMT_RGB565:
204 return true;
205 default:
206 return false;
207 }
208 }
209
210 static irqreturn_t atmel_isi_handle_streaming(struct atmel_isi *isi)
211 {
212 if (isi->active) {
213 struct vb2_v4l2_buffer *vbuf = &isi->active->vb;
214 struct frame_buffer *buf = isi->active;
215
216 list_del_init(&buf->list);
217 vbuf->vb2_buf.timestamp = ktime_get_ns();
218 vbuf->sequence = isi->sequence++;
219 vb2_buffer_done(&vbuf->vb2_buf, VB2_BUF_STATE_DONE);
220 }
221
222 if (list_empty(&isi->video_buffer_list)) {
223 isi->active = NULL;
224 } else {
225 /* start next dma frame. */
226 isi->active = list_entry(isi->video_buffer_list.next,
227 struct frame_buffer, list);
228 if (!isi->enable_preview_path) {
229 isi_writel(isi, ISI_DMA_C_DSCR,
230 (u32)isi->active->p_dma_desc->fbd_phys);
231 isi_writel(isi, ISI_DMA_C_CTRL,
232 ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
233 isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_C_CH);
234 } else {
235 isi_writel(isi, ISI_DMA_P_DSCR,
236 (u32)isi->active->p_dma_desc->fbd_phys);
237 isi_writel(isi, ISI_DMA_P_CTRL,
238 ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
239 isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_P_CH);
240 }
241 }
242 return IRQ_HANDLED;
243 }
244
245 /* ISI interrupt service routine */
246 static irqreturn_t isi_interrupt(int irq, void *dev_id)
247 {
248 struct atmel_isi *isi = dev_id;
249 u32 status, mask, pending;
250 irqreturn_t ret = IRQ_NONE;
251
252 spin_lock(&isi->lock);
253
254 status = isi_readl(isi, ISI_STATUS);
255 mask = isi_readl(isi, ISI_INTMASK);
256 pending = status & mask;
257
258 if (pending & ISI_CTRL_SRST) {
259 complete(&isi->complete);
260 isi_writel(isi, ISI_INTDIS, ISI_CTRL_SRST);
261 ret = IRQ_HANDLED;
262 } else if (pending & ISI_CTRL_DIS) {
263 complete(&isi->complete);
264 isi_writel(isi, ISI_INTDIS, ISI_CTRL_DIS);
265 ret = IRQ_HANDLED;
266 } else {
267 if (likely(pending & ISI_SR_CXFR_DONE) ||
268 likely(pending & ISI_SR_PXFR_DONE))
269 ret = atmel_isi_handle_streaming(isi);
270 }
271
272 spin_unlock(&isi->lock);
273 return ret;
274 }
275
276 #define WAIT_ISI_RESET 1
277 #define WAIT_ISI_DISABLE 0
278 static int atmel_isi_wait_status(struct atmel_isi *isi, int wait_reset)
279 {
280 unsigned long timeout;
281 /*
282 * The reset or disable will only succeed if we have a
283 * pixel clock from the camera.
284 */
285 init_completion(&isi->complete);
286
287 if (wait_reset) {
288 isi_writel(isi, ISI_INTEN, ISI_CTRL_SRST);
289 isi_writel(isi, ISI_CTRL, ISI_CTRL_SRST);
290 } else {
291 isi_writel(isi, ISI_INTEN, ISI_CTRL_DIS);
292 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
293 }
294
295 timeout = wait_for_completion_timeout(&isi->complete,
296 msecs_to_jiffies(500));
297 if (timeout == 0)
298 return -ETIMEDOUT;
299
300 return 0;
301 }
302
303 /* ------------------------------------------------------------------
304 Videobuf operations
305 ------------------------------------------------------------------*/
306 static int queue_setup(struct vb2_queue *vq,
307 unsigned int *nbuffers, unsigned int *nplanes,
308 unsigned int sizes[], void *alloc_ctxs[])
309 {
310 struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
311 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
312 struct atmel_isi *isi = ici->priv;
313 unsigned long size;
314
315 size = icd->sizeimage;
316
317 if (!*nbuffers || *nbuffers > MAX_BUFFER_NUM)
318 *nbuffers = MAX_BUFFER_NUM;
319
320 if (size * *nbuffers > VID_LIMIT_BYTES)
321 *nbuffers = VID_LIMIT_BYTES / size;
322
323 *nplanes = 1;
324 sizes[0] = size;
325 alloc_ctxs[0] = isi->alloc_ctx;
326
327 isi->sequence = 0;
328 isi->active = NULL;
329
330 dev_dbg(icd->parent, "%s, count=%d, size=%ld\n", __func__,
331 *nbuffers, size);
332
333 return 0;
334 }
335
336 static int buffer_init(struct vb2_buffer *vb)
337 {
338 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
339 struct frame_buffer *buf = container_of(vbuf, struct frame_buffer, vb);
340
341 buf->p_dma_desc = NULL;
342 INIT_LIST_HEAD(&buf->list);
343
344 return 0;
345 }
346
347 static int buffer_prepare(struct vb2_buffer *vb)
348 {
349 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
350 struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
351 struct frame_buffer *buf = container_of(vbuf, struct frame_buffer, vb);
352 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
353 struct atmel_isi *isi = ici->priv;
354 unsigned long size;
355 struct isi_dma_desc *desc;
356
357 size = icd->sizeimage;
358
359 if (vb2_plane_size(vb, 0) < size) {
360 dev_err(icd->parent, "%s data will not fit into plane (%lu < %lu)\n",
361 __func__, vb2_plane_size(vb, 0), size);
362 return -EINVAL;
363 }
364
365 vb2_set_plane_payload(vb, 0, size);
366
367 if (!buf->p_dma_desc) {
368 if (list_empty(&isi->dma_desc_head)) {
369 dev_err(icd->parent, "Not enough dma descriptors.\n");
370 return -EINVAL;
371 } else {
372 /* Get an available descriptor */
373 desc = list_entry(isi->dma_desc_head.next,
374 struct isi_dma_desc, list);
375 /* Delete the descriptor since now it is used */
376 list_del_init(&desc->list);
377
378 /* Initialize the dma descriptor */
379 desc->p_fbd->fb_address =
380 vb2_dma_contig_plane_dma_addr(vb, 0);
381 desc->p_fbd->next_fbd_address = 0;
382 set_dma_ctrl(desc->p_fbd, ISI_DMA_CTRL_WB);
383
384 buf->p_dma_desc = desc;
385 }
386 }
387 return 0;
388 }
389
390 static void buffer_cleanup(struct vb2_buffer *vb)
391 {
392 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
393 struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
394 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
395 struct atmel_isi *isi = ici->priv;
396 struct frame_buffer *buf = container_of(vbuf, struct frame_buffer, vb);
397
398 /* This descriptor is available now and we add to head list */
399 if (buf->p_dma_desc)
400 list_add(&buf->p_dma_desc->list, &isi->dma_desc_head);
401 }
402
403 static void start_dma(struct atmel_isi *isi, struct frame_buffer *buffer)
404 {
405 u32 ctrl, cfg1;
406
407 cfg1 = isi_readl(isi, ISI_CFG1);
408 /* Enable irq: cxfr for the codec path, pxfr for the preview path */
409 isi_writel(isi, ISI_INTEN,
410 ISI_SR_CXFR_DONE | ISI_SR_PXFR_DONE);
411
412 /* Check if already in a frame */
413 if (!isi->enable_preview_path) {
414 if (isi_readl(isi, ISI_STATUS) & ISI_CTRL_CDC) {
415 dev_err(isi->soc_host.icd->parent, "Already in frame handling.\n");
416 return;
417 }
418
419 isi_writel(isi, ISI_DMA_C_DSCR,
420 (u32)buffer->p_dma_desc->fbd_phys);
421 isi_writel(isi, ISI_DMA_C_CTRL,
422 ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
423 isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_C_CH);
424 } else {
425 isi_writel(isi, ISI_DMA_P_DSCR,
426 (u32)buffer->p_dma_desc->fbd_phys);
427 isi_writel(isi, ISI_DMA_P_CTRL,
428 ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
429 isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_P_CH);
430 }
431
432 cfg1 &= ~ISI_CFG1_FRATE_DIV_MASK;
433 /* Enable linked list */
434 cfg1 |= isi->pdata.frate | ISI_CFG1_DISCR;
435
436 /* Enable ISI */
437 ctrl = ISI_CTRL_EN;
438
439 if (!isi->enable_preview_path)
440 ctrl |= ISI_CTRL_CDC;
441
442 isi_writel(isi, ISI_CTRL, ctrl);
443 isi_writel(isi, ISI_CFG1, cfg1);
444 }
445
446 static void buffer_queue(struct vb2_buffer *vb)
447 {
448 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
449 struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
450 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
451 struct atmel_isi *isi = ici->priv;
452 struct frame_buffer *buf = container_of(vbuf, struct frame_buffer, vb);
453 unsigned long flags = 0;
454
455 spin_lock_irqsave(&isi->lock, flags);
456 list_add_tail(&buf->list, &isi->video_buffer_list);
457
458 if (isi->active == NULL) {
459 isi->active = buf;
460 if (vb2_is_streaming(vb->vb2_queue))
461 start_dma(isi, buf);
462 }
463 spin_unlock_irqrestore(&isi->lock, flags);
464 }
465
466 static int start_streaming(struct vb2_queue *vq, unsigned int count)
467 {
468 struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
469 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
470 struct atmel_isi *isi = ici->priv;
471 int ret;
472
473 pm_runtime_get_sync(ici->v4l2_dev.dev);
474
475 /* Reset ISI */
476 ret = atmel_isi_wait_status(isi, WAIT_ISI_RESET);
477 if (ret < 0) {
478 dev_err(icd->parent, "Reset ISI timed out\n");
479 pm_runtime_put(ici->v4l2_dev.dev);
480 return ret;
481 }
482 /* Disable all interrupts */
483 isi_writel(isi, ISI_INTDIS, (u32)~0UL);
484
485 configure_geometry(isi, icd->user_width, icd->user_height,
486 icd->current_fmt);
487
488 spin_lock_irq(&isi->lock);
489 /* Clear any pending interrupt */
490 isi_readl(isi, ISI_STATUS);
491
492 if (count)
493 start_dma(isi, isi->active);
494 spin_unlock_irq(&isi->lock);
495
496 return 0;
497 }
498
499 /* abort streaming and wait for last buffer */
500 static void stop_streaming(struct vb2_queue *vq)
501 {
502 struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
503 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
504 struct atmel_isi *isi = ici->priv;
505 struct frame_buffer *buf, *node;
506 int ret = 0;
507 unsigned long timeout;
508
509 spin_lock_irq(&isi->lock);
510 isi->active = NULL;
511 /* Release all active buffers */
512 list_for_each_entry_safe(buf, node, &isi->video_buffer_list, list) {
513 list_del_init(&buf->list);
514 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
515 }
516 spin_unlock_irq(&isi->lock);
517
518 if (!isi->enable_preview_path) {
519 timeout = jiffies + FRAME_INTERVAL_MILLI_SEC * HZ;
520 /* Wait until the end of the current frame. */
521 while ((isi_readl(isi, ISI_STATUS) & ISI_CTRL_CDC) &&
522 time_before(jiffies, timeout))
523 msleep(1);
524
525 if (time_after(jiffies, timeout))
526 dev_err(icd->parent,
527 "Timeout waiting for finishing codec request\n");
528 }
529
530 /* Disable interrupts */
531 isi_writel(isi, ISI_INTDIS,
532 ISI_SR_CXFR_DONE | ISI_SR_PXFR_DONE);
533
534 /* Disable ISI and wait for it is done */
535 ret = atmel_isi_wait_status(isi, WAIT_ISI_DISABLE);
536 if (ret < 0)
537 dev_err(icd->parent, "Disable ISI timed out\n");
538
539 pm_runtime_put(ici->v4l2_dev.dev);
540 }
541
542 static struct vb2_ops isi_video_qops = {
543 .queue_setup = queue_setup,
544 .buf_init = buffer_init,
545 .buf_prepare = buffer_prepare,
546 .buf_cleanup = buffer_cleanup,
547 .buf_queue = buffer_queue,
548 .start_streaming = start_streaming,
549 .stop_streaming = stop_streaming,
550 .wait_prepare = vb2_ops_wait_prepare,
551 .wait_finish = vb2_ops_wait_finish,
552 };
553
554 /* ------------------------------------------------------------------
555 SOC camera operations for the device
556 ------------------------------------------------------------------*/
557 static int isi_camera_init_videobuf(struct vb2_queue *q,
558 struct soc_camera_device *icd)
559 {
560 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
561
562 q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
563 q->io_modes = VB2_MMAP;
564 q->drv_priv = icd;
565 q->buf_struct_size = sizeof(struct frame_buffer);
566 q->ops = &isi_video_qops;
567 q->mem_ops = &vb2_dma_contig_memops;
568 q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
569 q->lock = &ici->host_lock;
570
571 return vb2_queue_init(q);
572 }
573
574 static int isi_camera_set_fmt(struct soc_camera_device *icd,
575 struct v4l2_format *f)
576 {
577 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
578 const struct soc_camera_format_xlate *xlate;
579 struct v4l2_pix_format *pix = &f->fmt.pix;
580 struct v4l2_subdev_format format = {
581 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
582 };
583 struct v4l2_mbus_framefmt *mf = &format.format;
584 int ret;
585
586 /* check with atmel-isi support format, if not support use YUYV */
587 if (!is_supported(icd, pix->pixelformat))
588 pix->pixelformat = V4L2_PIX_FMT_YUYV;
589
590 xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
591 if (!xlate) {
592 dev_warn(icd->parent, "Format %x not found\n",
593 pix->pixelformat);
594 return -EINVAL;
595 }
596
597 dev_dbg(icd->parent, "Plan to set format %dx%d\n",
598 pix->width, pix->height);
599
600 mf->width = pix->width;
601 mf->height = pix->height;
602 mf->field = pix->field;
603 mf->colorspace = pix->colorspace;
604 mf->code = xlate->code;
605
606 ret = v4l2_subdev_call(sd, pad, set_fmt, NULL, &format);
607 if (ret < 0)
608 return ret;
609
610 if (mf->code != xlate->code)
611 return -EINVAL;
612
613 pix->width = mf->width;
614 pix->height = mf->height;
615 pix->field = mf->field;
616 pix->colorspace = mf->colorspace;
617 icd->current_fmt = xlate;
618
619 dev_dbg(icd->parent, "Finally set format %dx%d\n",
620 pix->width, pix->height);
621
622 return ret;
623 }
624
625 static int isi_camera_try_fmt(struct soc_camera_device *icd,
626 struct v4l2_format *f)
627 {
628 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
629 const struct soc_camera_format_xlate *xlate;
630 struct v4l2_pix_format *pix = &f->fmt.pix;
631 struct v4l2_subdev_pad_config pad_cfg;
632 struct v4l2_subdev_format format = {
633 .which = V4L2_SUBDEV_FORMAT_TRY,
634 };
635 struct v4l2_mbus_framefmt *mf = &format.format;
636 u32 pixfmt = pix->pixelformat;
637 int ret;
638
639 /* check with atmel-isi support format, if not support use YUYV */
640 if (!is_supported(icd, pix->pixelformat))
641 pix->pixelformat = V4L2_PIX_FMT_YUYV;
642
643 xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
644 if (pixfmt && !xlate) {
645 dev_warn(icd->parent, "Format %x not found\n", pixfmt);
646 return -EINVAL;
647 }
648
649 /* limit to Atmel ISI hardware capabilities */
650 if (pix->height > MAX_SUPPORT_HEIGHT)
651 pix->height = MAX_SUPPORT_HEIGHT;
652 if (pix->width > MAX_SUPPORT_WIDTH)
653 pix->width = MAX_SUPPORT_WIDTH;
654
655 /* limit to sensor capabilities */
656 mf->width = pix->width;
657 mf->height = pix->height;
658 mf->field = pix->field;
659 mf->colorspace = pix->colorspace;
660 mf->code = xlate->code;
661
662 ret = v4l2_subdev_call(sd, pad, set_fmt, &pad_cfg, &format);
663 if (ret < 0)
664 return ret;
665
666 pix->width = mf->width;
667 pix->height = mf->height;
668 pix->colorspace = mf->colorspace;
669
670 switch (mf->field) {
671 case V4L2_FIELD_ANY:
672 pix->field = V4L2_FIELD_NONE;
673 break;
674 case V4L2_FIELD_NONE:
675 break;
676 default:
677 dev_err(icd->parent, "Field type %d unsupported.\n",
678 mf->field);
679 ret = -EINVAL;
680 }
681
682 return ret;
683 }
684
685 static const struct soc_mbus_pixelfmt isi_camera_formats[] = {
686 {
687 .fourcc = V4L2_PIX_FMT_YUYV,
688 .name = "Packed YUV422 16 bit",
689 .bits_per_sample = 8,
690 .packing = SOC_MBUS_PACKING_2X8_PADHI,
691 .order = SOC_MBUS_ORDER_LE,
692 .layout = SOC_MBUS_LAYOUT_PACKED,
693 },
694 {
695 .fourcc = V4L2_PIX_FMT_RGB565,
696 .name = "RGB565",
697 .bits_per_sample = 8,
698 .packing = SOC_MBUS_PACKING_2X8_PADHI,
699 .order = SOC_MBUS_ORDER_LE,
700 .layout = SOC_MBUS_LAYOUT_PACKED,
701 },
702 };
703
704 /* This will be corrected as we get more formats */
705 static bool isi_camera_packing_supported(const struct soc_mbus_pixelfmt *fmt)
706 {
707 return fmt->packing == SOC_MBUS_PACKING_NONE ||
708 (fmt->bits_per_sample == 8 &&
709 fmt->packing == SOC_MBUS_PACKING_2X8_PADHI) ||
710 (fmt->bits_per_sample > 8 &&
711 fmt->packing == SOC_MBUS_PACKING_EXTEND16);
712 }
713
714 #define ISI_BUS_PARAM (V4L2_MBUS_MASTER | \
715 V4L2_MBUS_HSYNC_ACTIVE_HIGH | \
716 V4L2_MBUS_HSYNC_ACTIVE_LOW | \
717 V4L2_MBUS_VSYNC_ACTIVE_HIGH | \
718 V4L2_MBUS_VSYNC_ACTIVE_LOW | \
719 V4L2_MBUS_PCLK_SAMPLE_RISING | \
720 V4L2_MBUS_PCLK_SAMPLE_FALLING | \
721 V4L2_MBUS_DATA_ACTIVE_HIGH)
722
723 static int isi_camera_try_bus_param(struct soc_camera_device *icd,
724 unsigned char buswidth)
725 {
726 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
727 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
728 struct atmel_isi *isi = ici->priv;
729 struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
730 unsigned long common_flags;
731 int ret;
732
733 ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
734 if (!ret) {
735 common_flags = soc_mbus_config_compatible(&cfg,
736 ISI_BUS_PARAM);
737 if (!common_flags) {
738 dev_warn(icd->parent,
739 "Flags incompatible: camera 0x%x, host 0x%x\n",
740 cfg.flags, ISI_BUS_PARAM);
741 return -EINVAL;
742 }
743 } else if (ret != -ENOIOCTLCMD) {
744 return ret;
745 }
746
747 if ((1 << (buswidth - 1)) & isi->width_flags)
748 return 0;
749 return -EINVAL;
750 }
751
752
753 static int isi_camera_get_formats(struct soc_camera_device *icd,
754 unsigned int idx,
755 struct soc_camera_format_xlate *xlate)
756 {
757 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
758 int formats = 0, ret, i, n;
759 /* sensor format */
760 struct v4l2_subdev_mbus_code_enum code = {
761 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
762 .index = idx,
763 };
764 /* soc camera host format */
765 const struct soc_mbus_pixelfmt *fmt;
766
767 ret = v4l2_subdev_call(sd, pad, enum_mbus_code, NULL, &code);
768 if (ret < 0)
769 /* No more formats */
770 return 0;
771
772 fmt = soc_mbus_get_fmtdesc(code.code);
773 if (!fmt) {
774 dev_err(icd->parent,
775 "Invalid format code #%u: %d\n", idx, code.code);
776 return 0;
777 }
778
779 /* This also checks support for the requested bits-per-sample */
780 ret = isi_camera_try_bus_param(icd, fmt->bits_per_sample);
781 if (ret < 0) {
782 dev_err(icd->parent,
783 "Fail to try the bus parameters.\n");
784 return 0;
785 }
786
787 switch (code.code) {
788 case MEDIA_BUS_FMT_UYVY8_2X8:
789 case MEDIA_BUS_FMT_VYUY8_2X8:
790 case MEDIA_BUS_FMT_YUYV8_2X8:
791 case MEDIA_BUS_FMT_YVYU8_2X8:
792 n = ARRAY_SIZE(isi_camera_formats);
793 formats += n;
794 for (i = 0; xlate && i < n; i++, xlate++) {
795 xlate->host_fmt = &isi_camera_formats[i];
796 xlate->code = code.code;
797 dev_dbg(icd->parent, "Providing format %s using code %d\n",
798 xlate->host_fmt->name, xlate->code);
799 }
800 break;
801 default:
802 if (!isi_camera_packing_supported(fmt))
803 return 0;
804 if (xlate)
805 dev_dbg(icd->parent,
806 "Providing format %s in pass-through mode\n",
807 fmt->name);
808 }
809
810 /* Generic pass-through */
811 formats++;
812 if (xlate) {
813 xlate->host_fmt = fmt;
814 xlate->code = code.code;
815 xlate++;
816 }
817
818 return formats;
819 }
820
821 static int isi_camera_add_device(struct soc_camera_device *icd)
822 {
823 dev_dbg(icd->parent, "Atmel ISI Camera driver attached to camera %d\n",
824 icd->devnum);
825
826 return 0;
827 }
828
829 static void isi_camera_remove_device(struct soc_camera_device *icd)
830 {
831 dev_dbg(icd->parent, "Atmel ISI Camera driver detached from camera %d\n",
832 icd->devnum);
833 }
834
835 static unsigned int isi_camera_poll(struct file *file, poll_table *pt)
836 {
837 struct soc_camera_device *icd = file->private_data;
838
839 return vb2_poll(&icd->vb2_vidq, file, pt);
840 }
841
842 static int isi_camera_querycap(struct soc_camera_host *ici,
843 struct v4l2_capability *cap)
844 {
845 strcpy(cap->driver, "atmel-isi");
846 strcpy(cap->card, "Atmel Image Sensor Interface");
847 cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
848 cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
849
850 return 0;
851 }
852
853 static int isi_camera_set_bus_param(struct soc_camera_device *icd)
854 {
855 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
856 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
857 struct atmel_isi *isi = ici->priv;
858 struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
859 unsigned long common_flags;
860 int ret;
861 u32 cfg1 = 0;
862
863 ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
864 if (!ret) {
865 common_flags = soc_mbus_config_compatible(&cfg,
866 ISI_BUS_PARAM);
867 if (!common_flags) {
868 dev_warn(icd->parent,
869 "Flags incompatible: camera 0x%x, host 0x%x\n",
870 cfg.flags, ISI_BUS_PARAM);
871 return -EINVAL;
872 }
873 } else if (ret != -ENOIOCTLCMD) {
874 return ret;
875 } else {
876 common_flags = ISI_BUS_PARAM;
877 }
878 dev_dbg(icd->parent, "Flags cam: 0x%x host: 0x%x common: 0x%lx\n",
879 cfg.flags, ISI_BUS_PARAM, common_flags);
880
881 /* Make choises, based on platform preferences */
882 if ((common_flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH) &&
883 (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)) {
884 if (isi->pdata.hsync_act_low)
885 common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_HIGH;
886 else
887 common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_LOW;
888 }
889
890 if ((common_flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH) &&
891 (common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)) {
892 if (isi->pdata.vsync_act_low)
893 common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_HIGH;
894 else
895 common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_LOW;
896 }
897
898 if ((common_flags & V4L2_MBUS_PCLK_SAMPLE_RISING) &&
899 (common_flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)) {
900 if (isi->pdata.pclk_act_falling)
901 common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_RISING;
902 else
903 common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_FALLING;
904 }
905
906 cfg.flags = common_flags;
907 ret = v4l2_subdev_call(sd, video, s_mbus_config, &cfg);
908 if (ret < 0 && ret != -ENOIOCTLCMD) {
909 dev_dbg(icd->parent, "camera s_mbus_config(0x%lx) returned %d\n",
910 common_flags, ret);
911 return ret;
912 }
913
914 /* set bus param for ISI */
915 if (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)
916 cfg1 |= ISI_CFG1_HSYNC_POL_ACTIVE_LOW;
917 if (common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
918 cfg1 |= ISI_CFG1_VSYNC_POL_ACTIVE_LOW;
919 if (common_flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)
920 cfg1 |= ISI_CFG1_PIXCLK_POL_ACTIVE_FALLING;
921
922 dev_dbg(icd->parent, "vsync active %s, hsync active %s, sampling on pix clock %s edge\n",
923 common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW ? "low" : "high",
924 common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW ? "low" : "high",
925 common_flags & V4L2_MBUS_PCLK_SAMPLE_FALLING ? "falling" : "rising");
926
927 if (isi->pdata.has_emb_sync)
928 cfg1 |= ISI_CFG1_EMB_SYNC;
929 if (isi->pdata.full_mode)
930 cfg1 |= ISI_CFG1_FULL_MODE;
931
932 cfg1 |= ISI_CFG1_THMASK_BEATS_16;
933
934 /* Enable PM and peripheral clock before operate isi registers */
935 pm_runtime_get_sync(ici->v4l2_dev.dev);
936
937 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
938 isi_writel(isi, ISI_CFG1, cfg1);
939
940 pm_runtime_put(ici->v4l2_dev.dev);
941
942 return 0;
943 }
944
945 static struct soc_camera_host_ops isi_soc_camera_host_ops = {
946 .owner = THIS_MODULE,
947 .add = isi_camera_add_device,
948 .remove = isi_camera_remove_device,
949 .set_fmt = isi_camera_set_fmt,
950 .try_fmt = isi_camera_try_fmt,
951 .get_formats = isi_camera_get_formats,
952 .init_videobuf2 = isi_camera_init_videobuf,
953 .poll = isi_camera_poll,
954 .querycap = isi_camera_querycap,
955 .set_bus_param = isi_camera_set_bus_param,
956 };
957
958 /* -----------------------------------------------------------------------*/
959 static int atmel_isi_remove(struct platform_device *pdev)
960 {
961 struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
962 struct atmel_isi *isi = container_of(soc_host,
963 struct atmel_isi, soc_host);
964
965 soc_camera_host_unregister(soc_host);
966 vb2_dma_contig_cleanup_ctx(isi->alloc_ctx);
967 dma_free_coherent(&pdev->dev,
968 sizeof(struct fbd) * MAX_BUFFER_NUM,
969 isi->p_fb_descriptors,
970 isi->fb_descriptors_phys);
971 pm_runtime_disable(&pdev->dev);
972
973 return 0;
974 }
975
976 static int atmel_isi_parse_dt(struct atmel_isi *isi,
977 struct platform_device *pdev)
978 {
979 struct device_node *np= pdev->dev.of_node;
980 struct v4l2_of_endpoint ep;
981 int err;
982
983 /* Default settings for ISI */
984 isi->pdata.full_mode = 1;
985 isi->pdata.frate = ISI_CFG1_FRATE_CAPTURE_ALL;
986
987 np = of_graph_get_next_endpoint(np, NULL);
988 if (!np) {
989 dev_err(&pdev->dev, "Could not find the endpoint\n");
990 return -EINVAL;
991 }
992
993 err = v4l2_of_parse_endpoint(np, &ep);
994 of_node_put(np);
995 if (err) {
996 dev_err(&pdev->dev, "Could not parse the endpoint\n");
997 return err;
998 }
999
1000 switch (ep.bus.parallel.bus_width) {
1001 case 8:
1002 isi->pdata.data_width_flags = ISI_DATAWIDTH_8;
1003 break;
1004 case 10:
1005 isi->pdata.data_width_flags =
1006 ISI_DATAWIDTH_8 | ISI_DATAWIDTH_10;
1007 break;
1008 default:
1009 dev_err(&pdev->dev, "Unsupported bus width: %d\n",
1010 ep.bus.parallel.bus_width);
1011 return -EINVAL;
1012 }
1013
1014 if (ep.bus.parallel.flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)
1015 isi->pdata.hsync_act_low = true;
1016 if (ep.bus.parallel.flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
1017 isi->pdata.vsync_act_low = true;
1018 if (ep.bus.parallel.flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)
1019 isi->pdata.pclk_act_falling = true;
1020
1021 if (ep.bus_type == V4L2_MBUS_BT656)
1022 isi->pdata.has_emb_sync = true;
1023
1024 return 0;
1025 }
1026
1027 static int atmel_isi_probe(struct platform_device *pdev)
1028 {
1029 int irq;
1030 struct atmel_isi *isi;
1031 struct resource *regs;
1032 int ret, i;
1033 struct soc_camera_host *soc_host;
1034
1035 isi = devm_kzalloc(&pdev->dev, sizeof(struct atmel_isi), GFP_KERNEL);
1036 if (!isi) {
1037 dev_err(&pdev->dev, "Can't allocate interface!\n");
1038 return -ENOMEM;
1039 }
1040
1041 isi->pclk = devm_clk_get(&pdev->dev, "isi_clk");
1042 if (IS_ERR(isi->pclk))
1043 return PTR_ERR(isi->pclk);
1044
1045 ret = atmel_isi_parse_dt(isi, pdev);
1046 if (ret)
1047 return ret;
1048
1049 isi->active = NULL;
1050 spin_lock_init(&isi->lock);
1051 INIT_LIST_HEAD(&isi->video_buffer_list);
1052 INIT_LIST_HEAD(&isi->dma_desc_head);
1053
1054 isi->p_fb_descriptors = dma_alloc_coherent(&pdev->dev,
1055 sizeof(struct fbd) * MAX_BUFFER_NUM,
1056 &isi->fb_descriptors_phys,
1057 GFP_KERNEL);
1058 if (!isi->p_fb_descriptors) {
1059 dev_err(&pdev->dev, "Can't allocate descriptors!\n");
1060 return -ENOMEM;
1061 }
1062
1063 for (i = 0; i < MAX_BUFFER_NUM; i++) {
1064 isi->dma_desc[i].p_fbd = isi->p_fb_descriptors + i;
1065 isi->dma_desc[i].fbd_phys = isi->fb_descriptors_phys +
1066 i * sizeof(struct fbd);
1067 list_add(&isi->dma_desc[i].list, &isi->dma_desc_head);
1068 }
1069
1070 isi->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
1071 if (IS_ERR(isi->alloc_ctx)) {
1072 ret = PTR_ERR(isi->alloc_ctx);
1073 goto err_alloc_ctx;
1074 }
1075
1076 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1077 isi->regs = devm_ioremap_resource(&pdev->dev, regs);
1078 if (IS_ERR(isi->regs)) {
1079 ret = PTR_ERR(isi->regs);
1080 goto err_ioremap;
1081 }
1082
1083 if (isi->pdata.data_width_flags & ISI_DATAWIDTH_8)
1084 isi->width_flags = 1 << 7;
1085 if (isi->pdata.data_width_flags & ISI_DATAWIDTH_10)
1086 isi->width_flags |= 1 << 9;
1087
1088 irq = platform_get_irq(pdev, 0);
1089 if (irq < 0) {
1090 ret = irq;
1091 goto err_req_irq;
1092 }
1093
1094 ret = devm_request_irq(&pdev->dev, irq, isi_interrupt, 0, "isi", isi);
1095 if (ret) {
1096 dev_err(&pdev->dev, "Unable to request irq %d\n", irq);
1097 goto err_req_irq;
1098 }
1099 isi->irq = irq;
1100
1101 soc_host = &isi->soc_host;
1102 soc_host->drv_name = "isi-camera";
1103 soc_host->ops = &isi_soc_camera_host_ops;
1104 soc_host->priv = isi;
1105 soc_host->v4l2_dev.dev = &pdev->dev;
1106 soc_host->nr = pdev->id;
1107
1108 pm_suspend_ignore_children(&pdev->dev, true);
1109 pm_runtime_enable(&pdev->dev);
1110
1111 ret = soc_camera_host_register(soc_host);
1112 if (ret) {
1113 dev_err(&pdev->dev, "Unable to register soc camera host\n");
1114 goto err_register_soc_camera_host;
1115 }
1116 return 0;
1117
1118 err_register_soc_camera_host:
1119 pm_runtime_disable(&pdev->dev);
1120 err_req_irq:
1121 err_ioremap:
1122 vb2_dma_contig_cleanup_ctx(isi->alloc_ctx);
1123 err_alloc_ctx:
1124 dma_free_coherent(&pdev->dev,
1125 sizeof(struct fbd) * MAX_BUFFER_NUM,
1126 isi->p_fb_descriptors,
1127 isi->fb_descriptors_phys);
1128
1129 return ret;
1130 }
1131
1132 #ifdef CONFIG_PM
1133 static int atmel_isi_runtime_suspend(struct device *dev)
1134 {
1135 struct soc_camera_host *soc_host = to_soc_camera_host(dev);
1136 struct atmel_isi *isi = container_of(soc_host,
1137 struct atmel_isi, soc_host);
1138
1139 clk_disable_unprepare(isi->pclk);
1140
1141 return 0;
1142 }
1143 static int atmel_isi_runtime_resume(struct device *dev)
1144 {
1145 struct soc_camera_host *soc_host = to_soc_camera_host(dev);
1146 struct atmel_isi *isi = container_of(soc_host,
1147 struct atmel_isi, soc_host);
1148
1149 return clk_prepare_enable(isi->pclk);
1150 }
1151 #endif /* CONFIG_PM */
1152
1153 static const struct dev_pm_ops atmel_isi_dev_pm_ops = {
1154 SET_RUNTIME_PM_OPS(atmel_isi_runtime_suspend,
1155 atmel_isi_runtime_resume, NULL)
1156 };
1157
1158 static const struct of_device_id atmel_isi_of_match[] = {
1159 { .compatible = "atmel,at91sam9g45-isi" },
1160 { }
1161 };
1162 MODULE_DEVICE_TABLE(of, atmel_isi_of_match);
1163
1164 static struct platform_driver atmel_isi_driver = {
1165 .remove = atmel_isi_remove,
1166 .driver = {
1167 .name = "atmel_isi",
1168 .of_match_table = of_match_ptr(atmel_isi_of_match),
1169 .pm = &atmel_isi_dev_pm_ops,
1170 },
1171 };
1172
1173 module_platform_driver_probe(atmel_isi_driver, atmel_isi_probe);
1174
1175 MODULE_AUTHOR("Josh Wu <josh.wu@atmel.com>");
1176 MODULE_DESCRIPTION("The V4L2 driver for Atmel Linux");
1177 MODULE_LICENSE("GPL");
1178 MODULE_SUPPORTED_DEVICE("video");
Linux kernel - Deliverables
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