1 /*
2 * Copyright (c) 2011 Atmel Corporation
3 * Josh Wu, <josh.wu@atmel.com>
4 *
5 * Based on previous work by Lars Haring, <lars.haring@atmel.com>
6 * and Sedji Gaouaou
7 * Based on the bttv driver for Bt848 with respective copyright holders
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14 #include <linux/clk.h>
15 #include <linux/completion.h>
16 #include <linux/delay.h>
17 #include <linux/fs.h>
18 #include <linux/init.h>
19 #include <linux/interrupt.h>
20 #include <linux/kernel.h>
21 #include <linux/module.h>
22 #include <linux/platform_device.h>
23 #include <linux/slab.h>
24
25 #include <media/atmel-isi.h>
26 #include <media/soc_camera.h>
27 #include <media/soc_mediabus.h>
28 #include <media/videobuf2-dma-contig.h>
29
30 #define MAX_BUFFER_NUM 32
31 #define MAX_SUPPORT_WIDTH 2048
32 #define MAX_SUPPORT_HEIGHT 2048
33 #define VID_LIMIT_BYTES (16 * 1024 * 1024)
34 #define MIN_FRAME_RATE 15
35 #define FRAME_INTERVAL_MILLI_SEC (1000 / MIN_FRAME_RATE)
36
37 /* ISI states */
38 enum {
39 ISI_STATE_IDLE = 0,
40 ISI_STATE_READY,
41 ISI_STATE_WAIT_SOF,
42 };
43
44 /* Frame buffer descriptor */
45 struct fbd {
46 /* Physical address of the frame buffer */
47 u32 fb_address;
48 /* DMA Control Register(only in HISI2) */
49 u32 dma_ctrl;
50 /* Physical address of the next fbd */
51 u32 next_fbd_address;
52 };
53
set_dma_ctrl(struct fbd * fb_desc,u32 ctrl)54 static void set_dma_ctrl(struct fbd *fb_desc, u32 ctrl)
55 {
56 fb_desc->dma_ctrl = ctrl;
57 }
58
59 struct isi_dma_desc {
60 struct list_head list;
61 struct fbd *p_fbd;
62 u32 fbd_phys;
63 };
64
65 /* Frame buffer data */
66 struct frame_buffer {
67 struct vb2_buffer vb;
68 struct isi_dma_desc *p_dma_desc;
69 struct list_head list;
70 };
71
72 struct atmel_isi {
73 /* Protects the access of variables shared with the ISR */
74 spinlock_t lock;
75 void __iomem *regs;
76
77 int sequence;
78 /* State of the ISI module in capturing mode */
79 int state;
80
81 /* Wait queue for waiting for SOF */
82 wait_queue_head_t vsync_wq;
83
84 struct vb2_alloc_ctx *alloc_ctx;
85
86 /* Allocate descriptors for dma buffer use */
87 struct fbd *p_fb_descriptors;
88 u32 fb_descriptors_phys;
89 struct list_head dma_desc_head;
90 struct isi_dma_desc dma_desc[MAX_BUFFER_NUM];
91
92 struct completion complete;
93 /* ISI peripherial clock */
94 struct clk *pclk;
95 /* ISI_MCK, feed to camera sensor to generate pixel clock */
96 struct clk *mck;
97 unsigned int irq;
98
99 struct isi_platform_data *pdata;
100 u16 width_flags; /* max 12 bits */
101
102 struct list_head video_buffer_list;
103 struct frame_buffer *active;
104
105 struct soc_camera_device *icd;
106 struct soc_camera_host soc_host;
107 };
108
isi_writel(struct atmel_isi * isi,u32 reg,u32 val)109 static void isi_writel(struct atmel_isi *isi, u32 reg, u32 val)
110 {
111 writel(val, isi->regs + reg);
112 }
isi_readl(struct atmel_isi * isi,u32 reg)113 static u32 isi_readl(struct atmel_isi *isi, u32 reg)
114 {
115 return readl(isi->regs + reg);
116 }
117
configure_geometry(struct atmel_isi * isi,u32 width,u32 height,enum v4l2_mbus_pixelcode code)118 static int configure_geometry(struct atmel_isi *isi, u32 width,
119 u32 height, enum v4l2_mbus_pixelcode code)
120 {
121 u32 cfg2, cr;
122
123 switch (code) {
124 /* YUV, including grey */
125 case V4L2_MBUS_FMT_Y8_1X8:
126 cr = ISI_CFG2_GRAYSCALE;
127 break;
128 case V4L2_MBUS_FMT_UYVY8_2X8:
129 cr = ISI_CFG2_YCC_SWAP_MODE_3;
130 break;
131 case V4L2_MBUS_FMT_VYUY8_2X8:
132 cr = ISI_CFG2_YCC_SWAP_MODE_2;
133 break;
134 case V4L2_MBUS_FMT_YUYV8_2X8:
135 cr = ISI_CFG2_YCC_SWAP_MODE_1;
136 break;
137 case V4L2_MBUS_FMT_YVYU8_2X8:
138 cr = ISI_CFG2_YCC_SWAP_DEFAULT;
139 break;
140 /* RGB, TODO */
141 default:
142 return -EINVAL;
143 }
144
145 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
146
147 cfg2 = isi_readl(isi, ISI_CFG2);
148 cfg2 |= cr;
149 /* Set width */
150 cfg2 &= ~(ISI_CFG2_IM_HSIZE_MASK);
151 cfg2 |= ((width - 1) << ISI_CFG2_IM_HSIZE_OFFSET) &
152 ISI_CFG2_IM_HSIZE_MASK;
153 /* Set height */
154 cfg2 &= ~(ISI_CFG2_IM_VSIZE_MASK);
155 cfg2 |= ((height - 1) << ISI_CFG2_IM_VSIZE_OFFSET)
156 & ISI_CFG2_IM_VSIZE_MASK;
157 isi_writel(isi, ISI_CFG2, cfg2);
158
159 return 0;
160 }
161
atmel_isi_handle_streaming(struct atmel_isi * isi)162 static irqreturn_t atmel_isi_handle_streaming(struct atmel_isi *isi)
163 {
164 if (isi->active) {
165 struct vb2_buffer *vb = &isi->active->vb;
166 struct frame_buffer *buf = isi->active;
167
168 list_del_init(&buf->list);
169 v4l2_get_timestamp(&vb->v4l2_buf.timestamp);
170 vb->v4l2_buf.sequence = isi->sequence++;
171 vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
172 }
173
174 if (list_empty(&isi->video_buffer_list)) {
175 isi->active = NULL;
176 } else {
177 /* start next dma frame. */
178 isi->active = list_entry(isi->video_buffer_list.next,
179 struct frame_buffer, list);
180 isi_writel(isi, ISI_DMA_C_DSCR,
181 isi->active->p_dma_desc->fbd_phys);
182 isi_writel(isi, ISI_DMA_C_CTRL,
183 ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
184 isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_C_CH);
185 }
186 return IRQ_HANDLED;
187 }
188
189 /* ISI interrupt service routine */
isi_interrupt(int irq,void * dev_id)190 static irqreturn_t isi_interrupt(int irq, void *dev_id)
191 {
192 struct atmel_isi *isi = dev_id;
193 u32 status, mask, pending;
194 irqreturn_t ret = IRQ_NONE;
195
196 spin_lock(&isi->lock);
197
198 status = isi_readl(isi, ISI_STATUS);
199 mask = isi_readl(isi, ISI_INTMASK);
200 pending = status & mask;
201
202 if (pending & ISI_CTRL_SRST) {
203 complete(&isi->complete);
204 isi_writel(isi, ISI_INTDIS, ISI_CTRL_SRST);
205 ret = IRQ_HANDLED;
206 } else if (pending & ISI_CTRL_DIS) {
207 complete(&isi->complete);
208 isi_writel(isi, ISI_INTDIS, ISI_CTRL_DIS);
209 ret = IRQ_HANDLED;
210 } else {
211 if ((pending & ISI_SR_VSYNC) &&
212 (isi->state == ISI_STATE_IDLE)) {
213 isi->state = ISI_STATE_READY;
214 wake_up_interruptible(&isi->vsync_wq);
215 ret = IRQ_HANDLED;
216 }
217 if (likely(pending & ISI_SR_CXFR_DONE))
218 ret = atmel_isi_handle_streaming(isi);
219 }
220
221 spin_unlock(&isi->lock);
222 return ret;
223 }
224
225 #define WAIT_ISI_RESET 1
226 #define WAIT_ISI_DISABLE 0
atmel_isi_wait_status(struct atmel_isi * isi,int wait_reset)227 static int atmel_isi_wait_status(struct atmel_isi *isi, int wait_reset)
228 {
229 unsigned long timeout;
230 /*
231 * The reset or disable will only succeed if we have a
232 * pixel clock from the camera.
233 */
234 init_completion(&isi->complete);
235
236 if (wait_reset) {
237 isi_writel(isi, ISI_INTEN, ISI_CTRL_SRST);
238 isi_writel(isi, ISI_CTRL, ISI_CTRL_SRST);
239 } else {
240 isi_writel(isi, ISI_INTEN, ISI_CTRL_DIS);
241 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
242 }
243
244 timeout = wait_for_completion_timeout(&isi->complete,
245 msecs_to_jiffies(100));
246 if (timeout == 0)
247 return -ETIMEDOUT;
248
249 return 0;
250 }
251
252 /* ------------------------------------------------------------------
253 Videobuf operations
254 ------------------------------------------------------------------*/
queue_setup(struct vb2_queue * vq,const struct v4l2_format * fmt,unsigned int * nbuffers,unsigned int * nplanes,unsigned int sizes[],void * alloc_ctxs[])255 static int queue_setup(struct vb2_queue *vq, const struct v4l2_format *fmt,
256 unsigned int *nbuffers, unsigned int *nplanes,
257 unsigned int sizes[], void *alloc_ctxs[])
258 {
259 struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
260 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
261 struct atmel_isi *isi = ici->priv;
262 unsigned long size;
263 int ret;
264
265 /* Reset ISI */
266 ret = atmel_isi_wait_status(isi, WAIT_ISI_RESET);
267 if (ret < 0) {
268 dev_err(icd->parent, "Reset ISI timed out\n");
269 return ret;
270 }
271 /* Disable all interrupts */
272 isi_writel(isi, ISI_INTDIS, ~0UL);
273
274 size = icd->sizeimage;
275
276 if (!*nbuffers || *nbuffers > MAX_BUFFER_NUM)
277 *nbuffers = MAX_BUFFER_NUM;
278
279 if (size * *nbuffers > VID_LIMIT_BYTES)
280 *nbuffers = VID_LIMIT_BYTES / size;
281
282 *nplanes = 1;
283 sizes[0] = size;
284 alloc_ctxs[0] = isi->alloc_ctx;
285
286 isi->sequence = 0;
287 isi->active = NULL;
288
289 dev_dbg(icd->parent, "%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 frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
298
299 buf->p_dma_desc = NULL;
300 INIT_LIST_HEAD(&buf->list);
301
302 return 0;
303 }
304
buffer_prepare(struct vb2_buffer * vb)305 static int buffer_prepare(struct vb2_buffer *vb)
306 {
307 struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
308 struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
309 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
310 struct atmel_isi *isi = ici->priv;
311 unsigned long size;
312 struct isi_dma_desc *desc;
313
314 size = icd->sizeimage;
315
316 if (vb2_plane_size(vb, 0) < size) {
317 dev_err(icd->parent, "%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(&buf->vb, 0, size);
323
324 if (!buf->p_dma_desc) {
325 if (list_empty(&isi->dma_desc_head)) {
326 dev_err(icd->parent, "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 soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
350 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
351 struct atmel_isi *isi = ici->priv;
352 struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
353
354 /* This descriptor is available now and we add to head list */
355 if (buf->p_dma_desc)
356 list_add(&buf->p_dma_desc->list, &isi->dma_desc_head);
357 }
358
start_dma(struct atmel_isi * isi,struct frame_buffer * buffer)359 static void start_dma(struct atmel_isi *isi, struct frame_buffer *buffer)
360 {
361 u32 ctrl, cfg1;
362
363 cfg1 = isi_readl(isi, ISI_CFG1);
364 /* Enable irq: cxfr for the codec path, pxfr for the preview path */
365 isi_writel(isi, ISI_INTEN,
366 ISI_SR_CXFR_DONE | ISI_SR_PXFR_DONE);
367
368 /* Check if already in a frame */
369 if (isi_readl(isi, ISI_STATUS) & ISI_CTRL_CDC) {
370 dev_err(isi->icd->parent, "Already in frame handling.\n");
371 return;
372 }
373
374 isi_writel(isi, ISI_DMA_C_DSCR, buffer->p_dma_desc->fbd_phys);
375 isi_writel(isi, ISI_DMA_C_CTRL, ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
376 isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_C_CH);
377
378 /* Enable linked list */
379 cfg1 |= isi->pdata->frate | ISI_CFG1_DISCR;
380
381 /* Enable codec path and ISI */
382 ctrl = ISI_CTRL_CDC | ISI_CTRL_EN;
383 isi_writel(isi, ISI_CTRL, ctrl);
384 isi_writel(isi, ISI_CFG1, cfg1);
385 }
386
buffer_queue(struct vb2_buffer * vb)387 static void buffer_queue(struct vb2_buffer *vb)
388 {
389 struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
390 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
391 struct atmel_isi *isi = ici->priv;
392 struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
393 unsigned long flags = 0;
394
395 spin_lock_irqsave(&isi->lock, flags);
396 list_add_tail(&buf->list, &isi->video_buffer_list);
397
398 if (isi->active == NULL) {
399 isi->active = buf;
400 if (vb2_is_streaming(vb->vb2_queue))
401 start_dma(isi, buf);
402 }
403 spin_unlock_irqrestore(&isi->lock, flags);
404 }
405
start_streaming(struct vb2_queue * vq,unsigned int count)406 static int start_streaming(struct vb2_queue *vq, unsigned int count)
407 {
408 struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
409 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
410 struct atmel_isi *isi = ici->priv;
411
412 u32 sr = 0;
413 int ret;
414
415 spin_lock_irq(&isi->lock);
416 isi->state = ISI_STATE_IDLE;
417 /* Clear any pending SOF interrupt */
418 sr = isi_readl(isi, ISI_STATUS);
419 /* Enable VSYNC interrupt for SOF */
420 isi_writel(isi, ISI_INTEN, ISI_SR_VSYNC);
421 isi_writel(isi, ISI_CTRL, ISI_CTRL_EN);
422 spin_unlock_irq(&isi->lock);
423
424 dev_dbg(icd->parent, "Waiting for SOF\n");
425 ret = wait_event_interruptible(isi->vsync_wq,
426 isi->state != ISI_STATE_IDLE);
427 if (ret)
428 goto err;
429
430 if (isi->state != ISI_STATE_READY) {
431 ret = -EIO;
432 goto err;
433 }
434
435 spin_lock_irq(&isi->lock);
436 isi->state = ISI_STATE_WAIT_SOF;
437 isi_writel(isi, ISI_INTDIS, ISI_SR_VSYNC);
438 if (count)
439 start_dma(isi, isi->active);
440 spin_unlock_irq(&isi->lock);
441
442 return 0;
443 err:
444 isi->active = NULL;
445 isi->sequence = 0;
446 INIT_LIST_HEAD(&isi->video_buffer_list);
447 return ret;
448 }
449
450 /* abort streaming and wait for last buffer */
stop_streaming(struct vb2_queue * vq)451 static int stop_streaming(struct vb2_queue *vq)
452 {
453 struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
454 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
455 struct atmel_isi *isi = ici->priv;
456 struct frame_buffer *buf, *node;
457 int ret = 0;
458 unsigned long timeout;
459
460 spin_lock_irq(&isi->lock);
461 isi->active = NULL;
462 /* Release all active buffers */
463 list_for_each_entry_safe(buf, node, &isi->video_buffer_list, list) {
464 list_del_init(&buf->list);
465 vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
466 }
467 spin_unlock_irq(&isi->lock);
468
469 timeout = jiffies + FRAME_INTERVAL_MILLI_SEC * HZ;
470 /* Wait until the end of the current frame. */
471 while ((isi_readl(isi, ISI_STATUS) & ISI_CTRL_CDC) &&
472 time_before(jiffies, timeout))
473 msleep(1);
474
475 if (time_after(jiffies, timeout)) {
476 dev_err(icd->parent,
477 "Timeout waiting for finishing codec request\n");
478 return -ETIMEDOUT;
479 }
480
481 /* Disable interrupts */
482 isi_writel(isi, ISI_INTDIS,
483 ISI_SR_CXFR_DONE | ISI_SR_PXFR_DONE);
484
485 /* Disable ISI and wait for it is done */
486 ret = atmel_isi_wait_status(isi, WAIT_ISI_DISABLE);
487 if (ret < 0)
488 dev_err(icd->parent, "Disable ISI timed out\n");
489
490 return ret;
491 }
492
493 static struct vb2_ops isi_video_qops = {
494 .queue_setup = queue_setup,
495 .buf_init = buffer_init,
496 .buf_prepare = buffer_prepare,
497 .buf_cleanup = buffer_cleanup,
498 .buf_queue = buffer_queue,
499 .start_streaming = start_streaming,
500 .stop_streaming = stop_streaming,
501 .wait_prepare = soc_camera_unlock,
502 .wait_finish = soc_camera_lock,
503 };
504
505 /* ------------------------------------------------------------------
506 SOC camera operations for the device
507 ------------------------------------------------------------------*/
isi_camera_init_videobuf(struct vb2_queue * q,struct soc_camera_device * icd)508 static int isi_camera_init_videobuf(struct vb2_queue *q,
509 struct soc_camera_device *icd)
510 {
511 q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
512 q->io_modes = VB2_MMAP;
513 q->drv_priv = icd;
514 q->buf_struct_size = sizeof(struct frame_buffer);
515 q->ops = &isi_video_qops;
516 q->mem_ops = &vb2_dma_contig_memops;
517 q->timestamp_type = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
518
519 return vb2_queue_init(q);
520 }
521
isi_camera_set_fmt(struct soc_camera_device * icd,struct v4l2_format * f)522 static int isi_camera_set_fmt(struct soc_camera_device *icd,
523 struct v4l2_format *f)
524 {
525 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
526 struct atmel_isi *isi = ici->priv;
527 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
528 const struct soc_camera_format_xlate *xlate;
529 struct v4l2_pix_format *pix = &f->fmt.pix;
530 struct v4l2_mbus_framefmt mf;
531 int ret;
532
533 xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
534 if (!xlate) {
535 dev_warn(icd->parent, "Format %x not found\n",
536 pix->pixelformat);
537 return -EINVAL;
538 }
539
540 dev_dbg(icd->parent, "Plan to set format %dx%d\n",
541 pix->width, pix->height);
542
543 mf.width = pix->width;
544 mf.height = pix->height;
545 mf.field = pix->field;
546 mf.colorspace = pix->colorspace;
547 mf.code = xlate->code;
548
549 ret = v4l2_subdev_call(sd, video, s_mbus_fmt, &mf);
550 if (ret < 0)
551 return ret;
552
553 if (mf.code != xlate->code)
554 return -EINVAL;
555
556 ret = configure_geometry(isi, pix->width, pix->height, xlate->code);
557 if (ret < 0)
558 return ret;
559
560 pix->width = mf.width;
561 pix->height = mf.height;
562 pix->field = mf.field;
563 pix->colorspace = mf.colorspace;
564 icd->current_fmt = xlate;
565
566 dev_dbg(icd->parent, "Finally set format %dx%d\n",
567 pix->width, pix->height);
568
569 return ret;
570 }
571
isi_camera_try_fmt(struct soc_camera_device * icd,struct v4l2_format * f)572 static int isi_camera_try_fmt(struct soc_camera_device *icd,
573 struct v4l2_format *f)
574 {
575 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
576 const struct soc_camera_format_xlate *xlate;
577 struct v4l2_pix_format *pix = &f->fmt.pix;
578 struct v4l2_mbus_framefmt mf;
579 u32 pixfmt = pix->pixelformat;
580 int ret;
581
582 xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
583 if (pixfmt && !xlate) {
584 dev_warn(icd->parent, "Format %x not found\n", pixfmt);
585 return -EINVAL;
586 }
587
588 /* limit to Atmel ISI hardware capabilities */
589 if (pix->height > MAX_SUPPORT_HEIGHT)
590 pix->height = MAX_SUPPORT_HEIGHT;
591 if (pix->width > MAX_SUPPORT_WIDTH)
592 pix->width = MAX_SUPPORT_WIDTH;
593
594 /* limit to sensor capabilities */
595 mf.width = pix->width;
596 mf.height = pix->height;
597 mf.field = pix->field;
598 mf.colorspace = pix->colorspace;
599 mf.code = xlate->code;
600
601 ret = v4l2_subdev_call(sd, video, try_mbus_fmt, &mf);
602 if (ret < 0)
603 return ret;
604
605 pix->width = mf.width;
606 pix->height = mf.height;
607 pix->colorspace = mf.colorspace;
608
609 switch (mf.field) {
610 case V4L2_FIELD_ANY:
611 pix->field = V4L2_FIELD_NONE;
612 break;
613 case V4L2_FIELD_NONE:
614 break;
615 default:
616 dev_err(icd->parent, "Field type %d unsupported.\n",
617 mf.field);
618 ret = -EINVAL;
619 }
620
621 return ret;
622 }
623
624 static const struct soc_mbus_pixelfmt isi_camera_formats[] = {
625 {
626 .fourcc = V4L2_PIX_FMT_YUYV,
627 .name = "Packed YUV422 16 bit",
628 .bits_per_sample = 8,
629 .packing = SOC_MBUS_PACKING_2X8_PADHI,
630 .order = SOC_MBUS_ORDER_LE,
631 .layout = SOC_MBUS_LAYOUT_PACKED,
632 },
633 };
634
635 /* This will be corrected as we get more formats */
isi_camera_packing_supported(const struct soc_mbus_pixelfmt * fmt)636 static bool isi_camera_packing_supported(const struct soc_mbus_pixelfmt *fmt)
637 {
638 return fmt->packing == SOC_MBUS_PACKING_NONE ||
639 (fmt->bits_per_sample == 8 &&
640 fmt->packing == SOC_MBUS_PACKING_2X8_PADHI) ||
641 (fmt->bits_per_sample > 8 &&
642 fmt->packing == SOC_MBUS_PACKING_EXTEND16);
643 }
644
645 #define ISI_BUS_PARAM (V4L2_MBUS_MASTER | \
646 V4L2_MBUS_HSYNC_ACTIVE_HIGH | \
647 V4L2_MBUS_HSYNC_ACTIVE_LOW | \
648 V4L2_MBUS_VSYNC_ACTIVE_HIGH | \
649 V4L2_MBUS_VSYNC_ACTIVE_LOW | \
650 V4L2_MBUS_PCLK_SAMPLE_RISING | \
651 V4L2_MBUS_PCLK_SAMPLE_FALLING | \
652 V4L2_MBUS_DATA_ACTIVE_HIGH)
653
isi_camera_try_bus_param(struct soc_camera_device * icd,unsigned char buswidth)654 static int isi_camera_try_bus_param(struct soc_camera_device *icd,
655 unsigned char buswidth)
656 {
657 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
658 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
659 struct atmel_isi *isi = ici->priv;
660 struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
661 unsigned long common_flags;
662 int ret;
663
664 ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
665 if (!ret) {
666 common_flags = soc_mbus_config_compatible(&cfg,
667 ISI_BUS_PARAM);
668 if (!common_flags) {
669 dev_warn(icd->parent,
670 "Flags incompatible: camera 0x%x, host 0x%x\n",
671 cfg.flags, ISI_BUS_PARAM);
672 return -EINVAL;
673 }
674 } else if (ret != -ENOIOCTLCMD) {
675 return ret;
676 }
677
678 if ((1 << (buswidth - 1)) & isi->width_flags)
679 return 0;
680 return -EINVAL;
681 }
682
683
isi_camera_get_formats(struct soc_camera_device * icd,unsigned int idx,struct soc_camera_format_xlate * xlate)684 static int isi_camera_get_formats(struct soc_camera_device *icd,
685 unsigned int idx,
686 struct soc_camera_format_xlate *xlate)
687 {
688 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
689 int formats = 0, ret;
690 /* sensor format */
691 enum v4l2_mbus_pixelcode code;
692 /* soc camera host format */
693 const struct soc_mbus_pixelfmt *fmt;
694
695 ret = v4l2_subdev_call(sd, video, enum_mbus_fmt, idx, &code);
696 if (ret < 0)
697 /* No more formats */
698 return 0;
699
700 fmt = soc_mbus_get_fmtdesc(code);
701 if (!fmt) {
702 dev_err(icd->parent,
703 "Invalid format code #%u: %d\n", idx, code);
704 return 0;
705 }
706
707 /* This also checks support for the requested bits-per-sample */
708 ret = isi_camera_try_bus_param(icd, fmt->bits_per_sample);
709 if (ret < 0) {
710 dev_err(icd->parent,
711 "Fail to try the bus parameters.\n");
712 return 0;
713 }
714
715 switch (code) {
716 case V4L2_MBUS_FMT_UYVY8_2X8:
717 case V4L2_MBUS_FMT_VYUY8_2X8:
718 case V4L2_MBUS_FMT_YUYV8_2X8:
719 case V4L2_MBUS_FMT_YVYU8_2X8:
720 formats++;
721 if (xlate) {
722 xlate->host_fmt = &isi_camera_formats[0];
723 xlate->code = code;
724 xlate++;
725 dev_dbg(icd->parent, "Providing format %s using code %d\n",
726 isi_camera_formats[0].name, code);
727 }
728 break;
729 default:
730 if (!isi_camera_packing_supported(fmt))
731 return 0;
732 if (xlate)
733 dev_dbg(icd->parent,
734 "Providing format %s in pass-through mode\n",
735 fmt->name);
736 }
737
738 /* Generic pass-through */
739 formats++;
740 if (xlate) {
741 xlate->host_fmt = fmt;
742 xlate->code = code;
743 xlate++;
744 }
745
746 return formats;
747 }
748
749 /* Called with .host_lock held */
isi_camera_add_device(struct soc_camera_device * icd)750 static int isi_camera_add_device(struct soc_camera_device *icd)
751 {
752 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
753 struct atmel_isi *isi = ici->priv;
754 int ret;
755
756 if (isi->icd)
757 return -EBUSY;
758
759 ret = clk_enable(isi->pclk);
760 if (ret)
761 return ret;
762
763 ret = clk_enable(isi->mck);
764 if (ret) {
765 clk_disable(isi->pclk);
766 return ret;
767 }
768
769 isi->icd = icd;
770 dev_dbg(icd->parent, "Atmel ISI Camera driver attached to camera %d\n",
771 icd->devnum);
772 return 0;
773 }
774 /* Called with .host_lock held */
isi_camera_remove_device(struct soc_camera_device * icd)775 static void isi_camera_remove_device(struct soc_camera_device *icd)
776 {
777 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
778 struct atmel_isi *isi = ici->priv;
779
780 BUG_ON(icd != isi->icd);
781
782 clk_disable(isi->mck);
783 clk_disable(isi->pclk);
784 isi->icd = NULL;
785
786 dev_dbg(icd->parent, "Atmel ISI Camera driver detached from camera %d\n",
787 icd->devnum);
788 }
789
isi_camera_poll(struct file * file,poll_table * pt)790 static unsigned int isi_camera_poll(struct file *file, poll_table *pt)
791 {
792 struct soc_camera_device *icd = file->private_data;
793
794 return vb2_poll(&icd->vb2_vidq, file, pt);
795 }
796
isi_camera_querycap(struct soc_camera_host * ici,struct v4l2_capability * cap)797 static int isi_camera_querycap(struct soc_camera_host *ici,
798 struct v4l2_capability *cap)
799 {
800 strcpy(cap->driver, "atmel-isi");
801 strcpy(cap->card, "Atmel Image Sensor Interface");
802 cap->capabilities = (V4L2_CAP_VIDEO_CAPTURE |
803 V4L2_CAP_STREAMING);
804 return 0;
805 }
806
isi_camera_set_bus_param(struct soc_camera_device * icd)807 static int isi_camera_set_bus_param(struct soc_camera_device *icd)
808 {
809 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
810 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
811 struct atmel_isi *isi = ici->priv;
812 struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
813 unsigned long common_flags;
814 int ret;
815 u32 cfg1 = 0;
816
817 ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
818 if (!ret) {
819 common_flags = soc_mbus_config_compatible(&cfg,
820 ISI_BUS_PARAM);
821 if (!common_flags) {
822 dev_warn(icd->parent,
823 "Flags incompatible: camera 0x%x, host 0x%x\n",
824 cfg.flags, ISI_BUS_PARAM);
825 return -EINVAL;
826 }
827 } else if (ret != -ENOIOCTLCMD) {
828 return ret;
829 } else {
830 common_flags = ISI_BUS_PARAM;
831 }
832 dev_dbg(icd->parent, "Flags cam: 0x%x host: 0x%x common: 0x%lx\n",
833 cfg.flags, ISI_BUS_PARAM, common_flags);
834
835 /* Make choises, based on platform preferences */
836 if ((common_flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH) &&
837 (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)) {
838 if (isi->pdata->hsync_act_low)
839 common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_HIGH;
840 else
841 common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_LOW;
842 }
843
844 if ((common_flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH) &&
845 (common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)) {
846 if (isi->pdata->vsync_act_low)
847 common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_HIGH;
848 else
849 common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_LOW;
850 }
851
852 if ((common_flags & V4L2_MBUS_PCLK_SAMPLE_RISING) &&
853 (common_flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)) {
854 if (isi->pdata->pclk_act_falling)
855 common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_RISING;
856 else
857 common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_FALLING;
858 }
859
860 cfg.flags = common_flags;
861 ret = v4l2_subdev_call(sd, video, s_mbus_config, &cfg);
862 if (ret < 0 && ret != -ENOIOCTLCMD) {
863 dev_dbg(icd->parent, "camera s_mbus_config(0x%lx) returned %d\n",
864 common_flags, ret);
865 return ret;
866 }
867
868 /* set bus param for ISI */
869 if (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)
870 cfg1 |= ISI_CFG1_HSYNC_POL_ACTIVE_LOW;
871 if (common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
872 cfg1 |= ISI_CFG1_VSYNC_POL_ACTIVE_LOW;
873 if (common_flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)
874 cfg1 |= ISI_CFG1_PIXCLK_POL_ACTIVE_FALLING;
875
876 if (isi->pdata->has_emb_sync)
877 cfg1 |= ISI_CFG1_EMB_SYNC;
878 if (isi->pdata->full_mode)
879 cfg1 |= ISI_CFG1_FULL_MODE;
880
881 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
882 isi_writel(isi, ISI_CFG1, cfg1);
883
884 return 0;
885 }
886
887 static struct soc_camera_host_ops isi_soc_camera_host_ops = {
888 .owner = THIS_MODULE,
889 .add = isi_camera_add_device,
890 .remove = isi_camera_remove_device,
891 .set_fmt = isi_camera_set_fmt,
892 .try_fmt = isi_camera_try_fmt,
893 .get_formats = isi_camera_get_formats,
894 .init_videobuf2 = isi_camera_init_videobuf,
895 .poll = isi_camera_poll,
896 .querycap = isi_camera_querycap,
897 .set_bus_param = isi_camera_set_bus_param,
898 };
899
900 /* -----------------------------------------------------------------------*/
atmel_isi_remove(struct platform_device * pdev)901 static int atmel_isi_remove(struct platform_device *pdev)
902 {
903 struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
904 struct atmel_isi *isi = container_of(soc_host,
905 struct atmel_isi, soc_host);
906
907 free_irq(isi->irq, isi);
908 soc_camera_host_unregister(soc_host);
909 vb2_dma_contig_cleanup_ctx(isi->alloc_ctx);
910 dma_free_coherent(&pdev->dev,
911 sizeof(struct fbd) * MAX_BUFFER_NUM,
912 isi->p_fb_descriptors,
913 isi->fb_descriptors_phys);
914
915 iounmap(isi->regs);
916 clk_unprepare(isi->mck);
917 clk_put(isi->mck);
918 clk_unprepare(isi->pclk);
919 clk_put(isi->pclk);
920 kfree(isi);
921
922 return 0;
923 }
924
atmel_isi_probe(struct platform_device * pdev)925 static int atmel_isi_probe(struct platform_device *pdev)
926 {
927 unsigned int irq;
928 struct atmel_isi *isi;
929 struct clk *pclk;
930 struct resource *regs;
931 int ret, i;
932 struct device *dev = &pdev->dev;
933 struct soc_camera_host *soc_host;
934 struct isi_platform_data *pdata;
935
936 pdata = dev->platform_data;
937 if (!pdata || !pdata->data_width_flags || !pdata->mck_hz) {
938 dev_err(&pdev->dev,
939 "No config available for Atmel ISI\n");
940 return -EINVAL;
941 }
942
943 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
944 if (!regs)
945 return -ENXIO;
946
947 pclk = clk_get(&pdev->dev, "isi_clk");
948 if (IS_ERR(pclk))
949 return PTR_ERR(pclk);
950
951 ret = clk_prepare(pclk);
952 if (ret)
953 goto err_clk_prepare_pclk;
954
955 isi = kzalloc(sizeof(struct atmel_isi), GFP_KERNEL);
956 if (!isi) {
957 ret = -ENOMEM;
958 dev_err(&pdev->dev, "Can't allocate interface!\n");
959 goto err_alloc_isi;
960 }
961
962 isi->pclk = pclk;
963 isi->pdata = pdata;
964 isi->active = NULL;
965 spin_lock_init(&isi->lock);
966 init_waitqueue_head(&isi->vsync_wq);
967 INIT_LIST_HEAD(&isi->video_buffer_list);
968 INIT_LIST_HEAD(&isi->dma_desc_head);
969
970 /* Get ISI_MCK, provided by programmable clock or external clock */
971 isi->mck = clk_get(dev, "isi_mck");
972 if (IS_ERR(isi->mck)) {
973 dev_err(dev, "Failed to get isi_mck\n");
974 ret = PTR_ERR(isi->mck);
975 goto err_clk_get;
976 }
977
978 ret = clk_prepare(isi->mck);
979 if (ret)
980 goto err_clk_prepare_mck;
981
982 /* Set ISI_MCK's frequency, it should be faster than pixel clock */
983 ret = clk_set_rate(isi->mck, pdata->mck_hz);
984 if (ret < 0)
985 goto err_set_mck_rate;
986
987 isi->p_fb_descriptors = dma_alloc_coherent(&pdev->dev,
988 sizeof(struct fbd) * MAX_BUFFER_NUM,
989 &isi->fb_descriptors_phys,
990 GFP_KERNEL);
991 if (!isi->p_fb_descriptors) {
992 ret = -ENOMEM;
993 dev_err(&pdev->dev, "Can't allocate descriptors!\n");
994 goto err_alloc_descriptors;
995 }
996
997 for (i = 0; i < MAX_BUFFER_NUM; i++) {
998 isi->dma_desc[i].p_fbd = isi->p_fb_descriptors + i;
999 isi->dma_desc[i].fbd_phys = isi->fb_descriptors_phys +
1000 i * sizeof(struct fbd);
1001 list_add(&isi->dma_desc[i].list, &isi->dma_desc_head);
1002 }
1003
1004 isi->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
1005 if (IS_ERR(isi->alloc_ctx)) {
1006 ret = PTR_ERR(isi->alloc_ctx);
1007 goto err_alloc_ctx;
1008 }
1009
1010 isi->regs = ioremap(regs->start, resource_size(regs));
1011 if (!isi->regs) {
1012 ret = -ENOMEM;
1013 goto err_ioremap;
1014 }
1015
1016 if (pdata->data_width_flags & ISI_DATAWIDTH_8)
1017 isi->width_flags = 1 << 7;
1018 if (pdata->data_width_flags & ISI_DATAWIDTH_10)
1019 isi->width_flags |= 1 << 9;
1020
1021 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
1022
1023 irq = platform_get_irq(pdev, 0);
1024 if (IS_ERR_VALUE(irq)) {
1025 ret = irq;
1026 goto err_req_irq;
1027 }
1028
1029 ret = request_irq(irq, isi_interrupt, 0, "isi", isi);
1030 if (ret) {
1031 dev_err(&pdev->dev, "Unable to request irq %d\n", irq);
1032 goto err_req_irq;
1033 }
1034 isi->irq = irq;
1035
1036 soc_host = &isi->soc_host;
1037 soc_host->drv_name = "isi-camera";
1038 soc_host->ops = &isi_soc_camera_host_ops;
1039 soc_host->priv = isi;
1040 soc_host->v4l2_dev.dev = &pdev->dev;
1041 soc_host->nr = pdev->id;
1042
1043 ret = soc_camera_host_register(soc_host);
1044 if (ret) {
1045 dev_err(&pdev->dev, "Unable to register soc camera host\n");
1046 goto err_register_soc_camera_host;
1047 }
1048 return 0;
1049
1050 err_register_soc_camera_host:
1051 free_irq(isi->irq, isi);
1052 err_req_irq:
1053 iounmap(isi->regs);
1054 err_ioremap:
1055 vb2_dma_contig_cleanup_ctx(isi->alloc_ctx);
1056 err_alloc_ctx:
1057 dma_free_coherent(&pdev->dev,
1058 sizeof(struct fbd) * MAX_BUFFER_NUM,
1059 isi->p_fb_descriptors,
1060 isi->fb_descriptors_phys);
1061 err_alloc_descriptors:
1062 err_set_mck_rate:
1063 clk_unprepare(isi->mck);
1064 err_clk_prepare_mck:
1065 clk_put(isi->mck);
1066 err_clk_get:
1067 kfree(isi);
1068 err_alloc_isi:
1069 clk_unprepare(pclk);
1070 err_clk_prepare_pclk:
1071 clk_put(pclk);
1072
1073 return ret;
1074 }
1075
1076 static struct platform_driver atmel_isi_driver = {
1077 .remove = atmel_isi_remove,
1078 .driver = {
1079 .name = "atmel_isi",
1080 .owner = THIS_MODULE,
1081 },
1082 };
1083
1084 module_platform_driver_probe(atmel_isi_driver, atmel_isi_probe);
1085
1086 MODULE_AUTHOR("Josh Wu <josh.wu@atmel.com>");
1087 MODULE_DESCRIPTION("The V4L2 driver for Atmel Linux");
1088 MODULE_LICENSE("GPL");
1089 MODULE_SUPPORTED_DEVICE("video");
1090