2 * V4L2 Driver for PXA camera host
4 * Copyright (C) 2006, Sascha Hauer, Pengutronix
5 * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
13 #include <linux/init.h>
14 #include <linux/module.h>
16 #include <linux/delay.h>
17 #include <linux/dma-mapping.h>
18 #include <linux/err.h>
19 #include <linux/errno.h>
21 #include <linux/interrupt.h>
22 #include <linux/kernel.h>
24 #include <linux/moduleparam.h>
25 #include <linux/time.h>
26 #include <linux/device.h>
27 #include <linux/platform_device.h>
28 #include <linux/clk.h>
29 #include <linux/sched.h>
30 #include <linux/slab.h>
32 #include <media/v4l2-common.h>
33 #include <media/v4l2-dev.h>
34 #include <media/videobuf-dma-sg.h>
35 #include <media/soc_camera.h>
36 #include <media/soc_mediabus.h>
37 #include <media/v4l2-of.h>
39 #include <linux/videodev2.h>
42 #include <linux/platform_data/camera-pxa.h>
44 #define PXA_CAM_VERSION "0.0.6"
45 #define PXA_CAM_DRV_NAME "pxa27x-camera"
47 /* Camera Interface */
60 #define CICR0_DMAEN (1 << 31) /* DMA request enable */
61 #define CICR0_PAR_EN (1 << 30) /* Parity enable */
62 #define CICR0_SL_CAP_EN (1 << 29) /* Capture enable for slave mode */
63 #define CICR0_ENB (1 << 28) /* Camera interface enable */
64 #define CICR0_DIS (1 << 27) /* Camera interface disable */
65 #define CICR0_SIM (0x7 << 24) /* Sensor interface mode mask */
66 #define CICR0_TOM (1 << 9) /* Time-out mask */
67 #define CICR0_RDAVM (1 << 8) /* Receive-data-available mask */
68 #define CICR0_FEM (1 << 7) /* FIFO-empty mask */
69 #define CICR0_EOLM (1 << 6) /* End-of-line mask */
70 #define CICR0_PERRM (1 << 5) /* Parity-error mask */
71 #define CICR0_QDM (1 << 4) /* Quick-disable mask */
72 #define CICR0_CDM (1 << 3) /* Disable-done mask */
73 #define CICR0_SOFM (1 << 2) /* Start-of-frame mask */
74 #define CICR0_EOFM (1 << 1) /* End-of-frame mask */
75 #define CICR0_FOM (1 << 0) /* FIFO-overrun mask */
77 #define CICR1_TBIT (1 << 31) /* Transparency bit */
78 #define CICR1_RGBT_CONV (0x3 << 29) /* RGBT conversion mask */
79 #define CICR1_PPL (0x7ff << 15) /* Pixels per line mask */
80 #define CICR1_RGB_CONV (0x7 << 12) /* RGB conversion mask */
81 #define CICR1_RGB_F (1 << 11) /* RGB format */
82 #define CICR1_YCBCR_F (1 << 10) /* YCbCr format */
83 #define CICR1_RGB_BPP (0x7 << 7) /* RGB bis per pixel mask */
84 #define CICR1_RAW_BPP (0x3 << 5) /* Raw bis per pixel mask */
85 #define CICR1_COLOR_SP (0x3 << 3) /* Color space mask */
86 #define CICR1_DW (0x7 << 0) /* Data width mask */
88 #define CICR2_BLW (0xff << 24) /* Beginning-of-line pixel clock
90 #define CICR2_ELW (0xff << 16) /* End-of-line pixel clock
92 #define CICR2_HSW (0x3f << 10) /* Horizontal sync pulse width mask */
93 #define CICR2_BFPW (0x3f << 3) /* Beginning-of-frame pixel clock
95 #define CICR2_FSW (0x7 << 0) /* Frame stabilization
98 #define CICR3_BFW (0xff << 24) /* Beginning-of-frame line clock
100 #define CICR3_EFW (0xff << 16) /* End-of-frame line clock
102 #define CICR3_VSW (0x3f << 10) /* Vertical sync pulse width mask */
103 #define CICR3_BFPW (0x3f << 3) /* Beginning-of-frame pixel clock
105 #define CICR3_LPF (0x7ff << 0) /* Lines per frame mask */
107 #define CICR4_MCLK_DLY (0x3 << 24) /* MCLK Data Capture Delay mask */
108 #define CICR4_PCLK_EN (1 << 23) /* Pixel clock enable */
109 #define CICR4_PCP (1 << 22) /* Pixel clock polarity */
110 #define CICR4_HSP (1 << 21) /* Horizontal sync polarity */
111 #define CICR4_VSP (1 << 20) /* Vertical sync polarity */
112 #define CICR4_MCLK_EN (1 << 19) /* MCLK enable */
113 #define CICR4_FR_RATE (0x7 << 8) /* Frame rate mask */
114 #define CICR4_DIV (0xff << 0) /* Clock divisor mask */
116 #define CISR_FTO (1 << 15) /* FIFO time-out */
117 #define CISR_RDAV_2 (1 << 14) /* Channel 2 receive data available */
118 #define CISR_RDAV_1 (1 << 13) /* Channel 1 receive data available */
119 #define CISR_RDAV_0 (1 << 12) /* Channel 0 receive data available */
120 #define CISR_FEMPTY_2 (1 << 11) /* Channel 2 FIFO empty */
121 #define CISR_FEMPTY_1 (1 << 10) /* Channel 1 FIFO empty */
122 #define CISR_FEMPTY_0 (1 << 9) /* Channel 0 FIFO empty */
123 #define CISR_EOL (1 << 8) /* End of line */
124 #define CISR_PAR_ERR (1 << 7) /* Parity error */
125 #define CISR_CQD (1 << 6) /* Camera interface quick disable */
126 #define CISR_CDD (1 << 5) /* Camera interface disable done */
127 #define CISR_SOF (1 << 4) /* Start of frame */
128 #define CISR_EOF (1 << 3) /* End of frame */
129 #define CISR_IFO_2 (1 << 2) /* FIFO overrun for Channel 2 */
130 #define CISR_IFO_1 (1 << 1) /* FIFO overrun for Channel 1 */
131 #define CISR_IFO_0 (1 << 0) /* FIFO overrun for Channel 0 */
133 #define CIFR_FLVL2 (0x7f << 23) /* FIFO 2 level mask */
134 #define CIFR_FLVL1 (0x7f << 16) /* FIFO 1 level mask */
135 #define CIFR_FLVL0 (0xff << 8) /* FIFO 0 level mask */
136 #define CIFR_THL_0 (0x3 << 4) /* Threshold Level for Channel 0 FIFO */
137 #define CIFR_RESET_F (1 << 3) /* Reset input FIFOs */
138 #define CIFR_FEN2 (1 << 2) /* FIFO enable for channel 2 */
139 #define CIFR_FEN1 (1 << 1) /* FIFO enable for channel 1 */
140 #define CIFR_FEN0 (1 << 0) /* FIFO enable for channel 0 */
142 #define CICR0_SIM_MP (0 << 24)
143 #define CICR0_SIM_SP (1 << 24)
144 #define CICR0_SIM_MS (2 << 24)
145 #define CICR0_SIM_EP (3 << 24)
146 #define CICR0_SIM_ES (4 << 24)
148 #define CICR1_DW_VAL(x) ((x) & CICR1_DW) /* Data bus width */
149 #define CICR1_PPL_VAL(x) (((x) << 15) & CICR1_PPL) /* Pixels per line */
150 #define CICR1_COLOR_SP_VAL(x) (((x) << 3) & CICR1_COLOR_SP) /* color space */
151 #define CICR1_RGB_BPP_VAL(x) (((x) << 7) & CICR1_RGB_BPP) /* bpp for rgb */
152 #define CICR1_RGBT_CONV_VAL(x) (((x) << 29) & CICR1_RGBT_CONV) /* rgbt conv */
154 #define CICR2_BLW_VAL(x) (((x) << 24) & CICR2_BLW) /* Beginning-of-line pixel clock wait count */
155 #define CICR2_ELW_VAL(x) (((x) << 16) & CICR2_ELW) /* End-of-line pixel clock wait count */
156 #define CICR2_HSW_VAL(x) (((x) << 10) & CICR2_HSW) /* Horizontal sync pulse width */
157 #define CICR2_BFPW_VAL(x) (((x) << 3) & CICR2_BFPW) /* Beginning-of-frame pixel clock wait count */
158 #define CICR2_FSW_VAL(x) (((x) << 0) & CICR2_FSW) /* Frame stabilization wait count */
160 #define CICR3_BFW_VAL(x) (((x) << 24) & CICR3_BFW) /* Beginning-of-frame line clock wait count */
161 #define CICR3_EFW_VAL(x) (((x) << 16) & CICR3_EFW) /* End-of-frame line clock wait count */
162 #define CICR3_VSW_VAL(x) (((x) << 11) & CICR3_VSW) /* Vertical sync pulse width */
163 #define CICR3_LPF_VAL(x) (((x) << 0) & CICR3_LPF) /* Lines per frame */
165 #define CICR0_IRQ_MASK (CICR0_TOM | CICR0_RDAVM | CICR0_FEM | CICR0_EOLM | \
166 CICR0_PERRM | CICR0_QDM | CICR0_CDM | CICR0_SOFM | \
167 CICR0_EOFM | CICR0_FOM)
172 enum pxa_camera_active_dma {
178 /* descriptor needed for the PXA DMA engine */
181 struct pxa_dma_desc *sg_cpu;
186 /* buffer for one video frame */
188 /* common v4l buffer stuff -- must be first */
189 struct videobuf_buffer vb;
191 /* our descriptor lists for Y, U and V channels */
192 struct pxa_cam_dma dmas[3];
194 enum pxa_camera_active_dma active_dma;
197 struct pxa_camera_dev {
198 struct soc_camera_host soc_host;
200 * PXA27x is only supposed to handle one camera on its Quick Capture
201 * interface. If anyone ever builds hardware to enable more than
202 * one camera, they will have to modify this driver too
210 unsigned int dma_chans[3];
212 struct pxacamera_platform_data *pdata;
213 struct resource *res;
214 unsigned long platform_flags;
218 u16 width_flags; /* max 10 bits */
220 struct list_head capture;
224 struct pxa_buffer *active;
225 struct pxa_dma_desc *sg_tail[3];
234 static const char *pxa_cam_driver_description = "PXA_Camera";
236 static unsigned int vid_limit = 16; /* Video memory limit, in Mb */
239 * Videobuf operations
241 static int pxa_videobuf_setup(struct videobuf_queue *vq, unsigned int *count,
244 struct soc_camera_device *icd = vq->priv_data;
246 dev_dbg(icd->parent, "count=%d, size=%d\n", *count, *size);
248 *size = icd->sizeimage;
252 if (*size * *count > vid_limit * 1024 * 1024)
253 *count = (vid_limit * 1024 * 1024) / *size;
258 static void free_buffer(struct videobuf_queue *vq, struct pxa_buffer *buf)
260 struct soc_camera_device *icd = vq->priv_data;
261 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
262 struct videobuf_dmabuf *dma = videobuf_to_dma(&buf->vb);
265 BUG_ON(in_interrupt());
267 dev_dbg(icd->parent, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
268 &buf->vb, buf->vb.baddr, buf->vb.bsize);
271 * This waits until this buffer is out of danger, i.e., until it is no
272 * longer in STATE_QUEUED or STATE_ACTIVE
274 videobuf_waiton(vq, &buf->vb, 0, 0);
275 videobuf_dma_unmap(vq->dev, dma);
276 videobuf_dma_free(dma);
278 for (i = 0; i < ARRAY_SIZE(buf->dmas); i++) {
279 if (buf->dmas[i].sg_cpu)
280 dma_free_coherent(ici->v4l2_dev.dev,
281 buf->dmas[i].sg_size,
283 buf->dmas[i].sg_dma);
284 buf->dmas[i].sg_cpu = NULL;
287 buf->vb.state = VIDEOBUF_NEEDS_INIT;
290 static int calculate_dma_sglen(struct scatterlist *sglist, int sglen,
291 int sg_first_ofs, int size)
293 int i, offset, dma_len, xfer_len;
294 struct scatterlist *sg;
296 offset = sg_first_ofs;
297 for_each_sg(sglist, sg, sglen, i) {
298 dma_len = sg_dma_len(sg);
300 /* PXA27x Developer's Manual 27.4.4.1: round up to 8 bytes */
301 xfer_len = roundup(min(dma_len - offset, size), 8);
303 size = max(0, size - xfer_len);
314 * pxa_init_dma_channel - init dma descriptors
315 * @pcdev: pxa camera device
316 * @buf: pxa buffer to find pxa dma channel
317 * @dma: dma video buffer
318 * @channel: dma channel (0 => 'Y', 1 => 'U', 2 => 'V')
319 * @cibr: camera Receive Buffer Register
320 * @size: bytes to transfer
321 * @sg_first: first element of sg_list
322 * @sg_first_ofs: offset in first element of sg_list
324 * Prepares the pxa dma descriptors to transfer one camera channel.
325 * Beware sg_first and sg_first_ofs are both input and output parameters.
327 * Returns 0 or -ENOMEM if no coherent memory is available
329 static int pxa_init_dma_channel(struct pxa_camera_dev *pcdev,
330 struct pxa_buffer *buf,
331 struct videobuf_dmabuf *dma, int channel,
333 struct scatterlist **sg_first, int *sg_first_ofs)
335 struct pxa_cam_dma *pxa_dma = &buf->dmas[channel];
336 struct device *dev = pcdev->soc_host.v4l2_dev.dev;
337 struct scatterlist *sg;
338 int i, offset, sglen;
339 int dma_len = 0, xfer_len = 0;
342 dma_free_coherent(dev, pxa_dma->sg_size,
343 pxa_dma->sg_cpu, pxa_dma->sg_dma);
345 sglen = calculate_dma_sglen(*sg_first, dma->sglen,
346 *sg_first_ofs, size);
348 pxa_dma->sg_size = (sglen + 1) * sizeof(struct pxa_dma_desc);
349 pxa_dma->sg_cpu = dma_alloc_coherent(dev, pxa_dma->sg_size,
350 &pxa_dma->sg_dma, GFP_KERNEL);
351 if (!pxa_dma->sg_cpu)
354 pxa_dma->sglen = sglen;
355 offset = *sg_first_ofs;
357 dev_dbg(dev, "DMA: sg_first=%p, sglen=%d, ofs=%d, dma.desc=%x\n",
358 *sg_first, sglen, *sg_first_ofs, pxa_dma->sg_dma);
361 for_each_sg(*sg_first, sg, sglen, i) {
362 dma_len = sg_dma_len(sg);
364 /* PXA27x Developer's Manual 27.4.4.1: round up to 8 bytes */
365 xfer_len = roundup(min(dma_len - offset, size), 8);
367 size = max(0, size - xfer_len);
369 pxa_dma->sg_cpu[i].dsadr = pcdev->res->start + cibr;
370 pxa_dma->sg_cpu[i].dtadr = sg_dma_address(sg) + offset;
371 pxa_dma->sg_cpu[i].dcmd =
372 DCMD_FLOWSRC | DCMD_BURST8 | DCMD_INCTRGADDR | xfer_len;
375 pxa_dma->sg_cpu[i].dcmd |= DCMD_STARTIRQEN;
377 pxa_dma->sg_cpu[i].ddadr =
378 pxa_dma->sg_dma + (i + 1) * sizeof(struct pxa_dma_desc);
380 dev_vdbg(dev, "DMA: desc.%08x->@phys=0x%08x, len=%d\n",
381 pxa_dma->sg_dma + i * sizeof(struct pxa_dma_desc),
382 sg_dma_address(sg) + offset, xfer_len);
389 pxa_dma->sg_cpu[sglen].ddadr = DDADR_STOP;
390 pxa_dma->sg_cpu[sglen].dcmd = DCMD_FLOWSRC | DCMD_BURST8 | DCMD_ENDIRQEN;
393 * Handle 1 special case :
394 * - in 3 planes (YUV422P format), we might finish with xfer_len equal
395 * to dma_len (end on PAGE boundary). In this case, the sg element
396 * for next plane should be the next after the last used to store the
397 * last scatter gather RAM page
399 if (xfer_len >= dma_len) {
400 *sg_first_ofs = xfer_len - dma_len;
401 *sg_first = sg_next(sg);
403 *sg_first_ofs = xfer_len;
410 static void pxa_videobuf_set_actdma(struct pxa_camera_dev *pcdev,
411 struct pxa_buffer *buf)
413 buf->active_dma = DMA_Y;
414 if (pcdev->channels == 3)
415 buf->active_dma |= DMA_U | DMA_V;
419 * Please check the DMA prepared buffer structure in :
420 * Documentation/video4linux/pxa_camera.txt
421 * Please check also in pxa_camera_check_link_miss() to understand why DMA chain
422 * modification while DMA chain is running will work anyway.
424 static int pxa_videobuf_prepare(struct videobuf_queue *vq,
425 struct videobuf_buffer *vb, enum v4l2_field field)
427 struct soc_camera_device *icd = vq->priv_data;
428 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
429 struct pxa_camera_dev *pcdev = ici->priv;
430 struct device *dev = pcdev->soc_host.v4l2_dev.dev;
431 struct pxa_buffer *buf = container_of(vb, struct pxa_buffer, vb);
433 int size_y, size_u = 0, size_v = 0;
435 dev_dbg(dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
436 vb, vb->baddr, vb->bsize);
438 /* Added list head initialization on alloc */
439 WARN_ON(!list_empty(&vb->queue));
443 * This can be useful if you want to see if we actually fill
444 * the buffer with something
446 memset((void *)vb->baddr, 0xaa, vb->bsize);
449 BUG_ON(NULL == icd->current_fmt);
452 * I think, in buf_prepare you only have to protect global data,
453 * the actual buffer is yours
457 if (buf->code != icd->current_fmt->code ||
458 vb->width != icd->user_width ||
459 vb->height != icd->user_height ||
460 vb->field != field) {
461 buf->code = icd->current_fmt->code;
462 vb->width = icd->user_width;
463 vb->height = icd->user_height;
465 vb->state = VIDEOBUF_NEEDS_INIT;
468 vb->size = icd->sizeimage;
469 if (0 != vb->baddr && vb->bsize < vb->size) {
474 if (vb->state == VIDEOBUF_NEEDS_INIT) {
477 struct videobuf_dmabuf *dma = videobuf_to_dma(vb);
478 struct scatterlist *sg;
480 ret = videobuf_iolock(vq, vb, NULL);
484 if (pcdev->channels == 3) {
486 size_u = size_v = size / 4;
493 /* init DMA for Y channel */
494 ret = pxa_init_dma_channel(pcdev, buf, dma, 0, CIBR0, size_y,
497 dev_err(dev, "DMA initialization for Y/RGB failed\n");
501 /* init DMA for U channel */
503 ret = pxa_init_dma_channel(pcdev, buf, dma, 1, CIBR1,
504 size_u, &sg, &next_ofs);
506 dev_err(dev, "DMA initialization for U failed\n");
510 /* init DMA for V channel */
512 ret = pxa_init_dma_channel(pcdev, buf, dma, 2, CIBR2,
513 size_v, &sg, &next_ofs);
515 dev_err(dev, "DMA initialization for V failed\n");
519 vb->state = VIDEOBUF_PREPARED;
523 pxa_videobuf_set_actdma(pcdev, buf);
528 dma_free_coherent(dev, buf->dmas[1].sg_size,
529 buf->dmas[1].sg_cpu, buf->dmas[1].sg_dma);
531 dma_free_coherent(dev, buf->dmas[0].sg_size,
532 buf->dmas[0].sg_cpu, buf->dmas[0].sg_dma);
534 free_buffer(vq, buf);
541 * pxa_dma_start_channels - start DMA channel for active buffer
542 * @pcdev: pxa camera device
544 * Initialize DMA channels to the beginning of the active video buffer, and
545 * start these channels.
547 static void pxa_dma_start_channels(struct pxa_camera_dev *pcdev)
550 struct pxa_buffer *active;
552 active = pcdev->active;
554 for (i = 0; i < pcdev->channels; i++) {
555 dev_dbg(pcdev->soc_host.v4l2_dev.dev,
556 "%s (channel=%d) ddadr=%08x\n", __func__,
557 i, active->dmas[i].sg_dma);
558 DDADR(pcdev->dma_chans[i]) = active->dmas[i].sg_dma;
559 DCSR(pcdev->dma_chans[i]) = DCSR_RUN;
563 static void pxa_dma_stop_channels(struct pxa_camera_dev *pcdev)
567 for (i = 0; i < pcdev->channels; i++) {
568 dev_dbg(pcdev->soc_host.v4l2_dev.dev,
569 "%s (channel=%d)\n", __func__, i);
570 DCSR(pcdev->dma_chans[i]) = 0;
574 static void pxa_dma_add_tail_buf(struct pxa_camera_dev *pcdev,
575 struct pxa_buffer *buf)
578 struct pxa_dma_desc *buf_last_desc;
580 for (i = 0; i < pcdev->channels; i++) {
581 buf_last_desc = buf->dmas[i].sg_cpu + buf->dmas[i].sglen;
582 buf_last_desc->ddadr = DDADR_STOP;
584 if (pcdev->sg_tail[i])
585 /* Link the new buffer to the old tail */
586 pcdev->sg_tail[i]->ddadr = buf->dmas[i].sg_dma;
588 /* Update the channel tail */
589 pcdev->sg_tail[i] = buf_last_desc;
594 * pxa_camera_start_capture - start video capturing
595 * @pcdev: camera device
597 * Launch capturing. DMA channels should not be active yet. They should get
598 * activated at the end of frame interrupt, to capture only whole frames, and
599 * never begin the capture of a partial frame.
601 static void pxa_camera_start_capture(struct pxa_camera_dev *pcdev)
605 dev_dbg(pcdev->soc_host.v4l2_dev.dev, "%s\n", __func__);
606 /* Enable End-Of-Frame Interrupt */
607 cicr0 = __raw_readl(pcdev->base + CICR0) | CICR0_ENB;
608 cicr0 &= ~CICR0_EOFM;
609 __raw_writel(cicr0, pcdev->base + CICR0);
612 static void pxa_camera_stop_capture(struct pxa_camera_dev *pcdev)
616 pxa_dma_stop_channels(pcdev);
618 cicr0 = __raw_readl(pcdev->base + CICR0) & ~CICR0_ENB;
619 __raw_writel(cicr0, pcdev->base + CICR0);
621 pcdev->active = NULL;
622 dev_dbg(pcdev->soc_host.v4l2_dev.dev, "%s\n", __func__);
625 /* Called under spinlock_irqsave(&pcdev->lock, ...) */
626 static void pxa_videobuf_queue(struct videobuf_queue *vq,
627 struct videobuf_buffer *vb)
629 struct soc_camera_device *icd = vq->priv_data;
630 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
631 struct pxa_camera_dev *pcdev = ici->priv;
632 struct pxa_buffer *buf = container_of(vb, struct pxa_buffer, vb);
634 dev_dbg(icd->parent, "%s (vb=0x%p) 0x%08lx %d active=%p\n",
635 __func__, vb, vb->baddr, vb->bsize, pcdev->active);
637 list_add_tail(&vb->queue, &pcdev->capture);
639 vb->state = VIDEOBUF_ACTIVE;
640 pxa_dma_add_tail_buf(pcdev, buf);
643 pxa_camera_start_capture(pcdev);
646 static void pxa_videobuf_release(struct videobuf_queue *vq,
647 struct videobuf_buffer *vb)
649 struct pxa_buffer *buf = container_of(vb, struct pxa_buffer, vb);
651 struct soc_camera_device *icd = vq->priv_data;
652 struct device *dev = icd->parent;
654 dev_dbg(dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
655 vb, vb->baddr, vb->bsize);
658 case VIDEOBUF_ACTIVE:
659 dev_dbg(dev, "%s (active)\n", __func__);
661 case VIDEOBUF_QUEUED:
662 dev_dbg(dev, "%s (queued)\n", __func__);
664 case VIDEOBUF_PREPARED:
665 dev_dbg(dev, "%s (prepared)\n", __func__);
668 dev_dbg(dev, "%s (unknown)\n", __func__);
673 free_buffer(vq, buf);
676 static void pxa_camera_wakeup(struct pxa_camera_dev *pcdev,
677 struct videobuf_buffer *vb,
678 struct pxa_buffer *buf)
682 /* _init is used to debug races, see comment in pxa_camera_reqbufs() */
683 list_del_init(&vb->queue);
684 vb->state = VIDEOBUF_DONE;
685 v4l2_get_timestamp(&vb->ts);
688 dev_dbg(pcdev->soc_host.v4l2_dev.dev, "%s dequeud buffer (vb=0x%p)\n",
691 if (list_empty(&pcdev->capture)) {
692 pxa_camera_stop_capture(pcdev);
693 for (i = 0; i < pcdev->channels; i++)
694 pcdev->sg_tail[i] = NULL;
698 pcdev->active = list_entry(pcdev->capture.next,
699 struct pxa_buffer, vb.queue);
703 * pxa_camera_check_link_miss - check missed DMA linking
704 * @pcdev: camera device
706 * The DMA chaining is done with DMA running. This means a tiny temporal window
707 * remains, where a buffer is queued on the chain, while the chain is already
708 * stopped. This means the tailed buffer would never be transferred by DMA.
709 * This function restarts the capture for this corner case, where :
710 * - DADR() == DADDR_STOP
711 * - a videobuffer is queued on the pcdev->capture list
713 * Please check the "DMA hot chaining timeslice issue" in
714 * Documentation/video4linux/pxa_camera.txt
716 * Context: should only be called within the dma irq handler
718 static void pxa_camera_check_link_miss(struct pxa_camera_dev *pcdev)
720 int i, is_dma_stopped = 1;
722 for (i = 0; i < pcdev->channels; i++)
723 if (DDADR(pcdev->dma_chans[i]) != DDADR_STOP)
725 dev_dbg(pcdev->soc_host.v4l2_dev.dev,
726 "%s : top queued buffer=%p, dma_stopped=%d\n",
727 __func__, pcdev->active, is_dma_stopped);
728 if (pcdev->active && is_dma_stopped)
729 pxa_camera_start_capture(pcdev);
732 static void pxa_camera_dma_irq(int channel, struct pxa_camera_dev *pcdev,
733 enum pxa_camera_active_dma act_dma)
735 struct device *dev = pcdev->soc_host.v4l2_dev.dev;
736 struct pxa_buffer *buf;
738 u32 status, camera_status, overrun;
739 struct videobuf_buffer *vb;
741 spin_lock_irqsave(&pcdev->lock, flags);
743 status = DCSR(channel);
744 DCSR(channel) = status;
746 camera_status = __raw_readl(pcdev->base + CISR);
747 overrun = CISR_IFO_0;
748 if (pcdev->channels == 3)
749 overrun |= CISR_IFO_1 | CISR_IFO_2;
751 if (status & DCSR_BUSERR) {
752 dev_err(dev, "DMA Bus Error IRQ!\n");
756 if (!(status & (DCSR_ENDINTR | DCSR_STARTINTR))) {
757 dev_err(dev, "Unknown DMA IRQ source, status: 0x%08x\n",
763 * pcdev->active should not be NULL in DMA irq handler.
765 * But there is one corner case : if capture was stopped due to an
766 * overrun of channel 1, and at that same channel 2 was completed.
768 * When handling the overrun in DMA irq for channel 1, we'll stop the
769 * capture and restart it (and thus set pcdev->active to NULL). But the
770 * DMA irq handler will already be pending for channel 2. So on entering
771 * the DMA irq handler for channel 2 there will be no active buffer, yet
777 vb = &pcdev->active->vb;
778 buf = container_of(vb, struct pxa_buffer, vb);
779 WARN_ON(buf->inwork || list_empty(&vb->queue));
781 dev_dbg(dev, "%s channel=%d %s%s(vb=0x%p) dma.desc=%x\n",
782 __func__, channel, status & DCSR_STARTINTR ? "SOF " : "",
783 status & DCSR_ENDINTR ? "EOF " : "", vb, DDADR(channel));
785 if (status & DCSR_ENDINTR) {
787 * It's normal if the last frame creates an overrun, as there
788 * are no more DMA descriptors to fetch from QCI fifos
790 if (camera_status & overrun &&
791 !list_is_last(pcdev->capture.next, &pcdev->capture)) {
792 dev_dbg(dev, "FIFO overrun! CISR: %x\n",
794 pxa_camera_stop_capture(pcdev);
795 pxa_camera_start_capture(pcdev);
798 buf->active_dma &= ~act_dma;
799 if (!buf->active_dma) {
800 pxa_camera_wakeup(pcdev, vb, buf);
801 pxa_camera_check_link_miss(pcdev);
806 spin_unlock_irqrestore(&pcdev->lock, flags);
809 static void pxa_camera_dma_irq_y(int channel, void *data)
811 struct pxa_camera_dev *pcdev = data;
812 pxa_camera_dma_irq(channel, pcdev, DMA_Y);
815 static void pxa_camera_dma_irq_u(int channel, void *data)
817 struct pxa_camera_dev *pcdev = data;
818 pxa_camera_dma_irq(channel, pcdev, DMA_U);
821 static void pxa_camera_dma_irq_v(int channel, void *data)
823 struct pxa_camera_dev *pcdev = data;
824 pxa_camera_dma_irq(channel, pcdev, DMA_V);
827 static struct videobuf_queue_ops pxa_videobuf_ops = {
828 .buf_setup = pxa_videobuf_setup,
829 .buf_prepare = pxa_videobuf_prepare,
830 .buf_queue = pxa_videobuf_queue,
831 .buf_release = pxa_videobuf_release,
834 static void pxa_camera_init_videobuf(struct videobuf_queue *q,
835 struct soc_camera_device *icd)
837 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
838 struct pxa_camera_dev *pcdev = ici->priv;
841 * We must pass NULL as dev pointer, then all pci_* dma operations
842 * transform to normal dma_* ones.
844 videobuf_queue_sg_init(q, &pxa_videobuf_ops, NULL, &pcdev->lock,
845 V4L2_BUF_TYPE_VIDEO_CAPTURE, V4L2_FIELD_NONE,
846 sizeof(struct pxa_buffer), icd, &ici->host_lock);
849 static u32 mclk_get_divisor(struct platform_device *pdev,
850 struct pxa_camera_dev *pcdev)
852 unsigned long mclk = pcdev->mclk;
853 struct device *dev = &pdev->dev;
855 unsigned long lcdclk;
857 lcdclk = clk_get_rate(pcdev->clk);
858 pcdev->ciclk = lcdclk;
860 /* mclk <= ciclk / 4 (27.4.2) */
861 if (mclk > lcdclk / 4) {
863 dev_warn(dev, "Limiting master clock to %lu\n", mclk);
866 /* We verify mclk != 0, so if anyone breaks it, here comes their Oops */
867 div = (lcdclk + 2 * mclk - 1) / (2 * mclk) - 1;
869 /* If we're not supplying MCLK, leave it at 0 */
870 if (pcdev->platform_flags & PXA_CAMERA_MCLK_EN)
871 pcdev->mclk = lcdclk / (2 * (div + 1));
873 dev_dbg(dev, "LCD clock %luHz, target freq %luHz, divisor %u\n",
879 static void recalculate_fifo_timeout(struct pxa_camera_dev *pcdev,
882 /* We want a timeout > 1 pixel time, not ">=" */
883 u32 ciclk_per_pixel = pcdev->ciclk / pclk + 1;
885 __raw_writel(ciclk_per_pixel, pcdev->base + CITOR);
888 static void pxa_camera_activate(struct pxa_camera_dev *pcdev)
892 /* disable all interrupts */
893 __raw_writel(0x3ff, pcdev->base + CICR0);
895 if (pcdev->platform_flags & PXA_CAMERA_PCLK_EN)
896 cicr4 |= CICR4_PCLK_EN;
897 if (pcdev->platform_flags & PXA_CAMERA_MCLK_EN)
898 cicr4 |= CICR4_MCLK_EN;
899 if (pcdev->platform_flags & PXA_CAMERA_PCP)
901 if (pcdev->platform_flags & PXA_CAMERA_HSP)
903 if (pcdev->platform_flags & PXA_CAMERA_VSP)
906 __raw_writel(pcdev->mclk_divisor | cicr4, pcdev->base + CICR4);
908 if (pcdev->platform_flags & PXA_CAMERA_MCLK_EN)
909 /* Initialise the timeout under the assumption pclk = mclk */
910 recalculate_fifo_timeout(pcdev, pcdev->mclk);
912 /* "Safe default" - 13MHz */
913 recalculate_fifo_timeout(pcdev, 13000000);
915 clk_prepare_enable(pcdev->clk);
918 static void pxa_camera_deactivate(struct pxa_camera_dev *pcdev)
920 clk_disable_unprepare(pcdev->clk);
923 static irqreturn_t pxa_camera_irq(int irq, void *data)
925 struct pxa_camera_dev *pcdev = data;
926 unsigned long status, cifr, cicr0;
927 struct pxa_buffer *buf;
928 struct videobuf_buffer *vb;
930 status = __raw_readl(pcdev->base + CISR);
931 dev_dbg(pcdev->soc_host.v4l2_dev.dev,
932 "Camera interrupt status 0x%lx\n", status);
937 __raw_writel(status, pcdev->base + CISR);
939 if (status & CISR_EOF) {
940 /* Reset the FIFOs */
941 cifr = __raw_readl(pcdev->base + CIFR) | CIFR_RESET_F;
942 __raw_writel(cifr, pcdev->base + CIFR);
944 pcdev->active = list_first_entry(&pcdev->capture,
945 struct pxa_buffer, vb.queue);
946 vb = &pcdev->active->vb;
947 buf = container_of(vb, struct pxa_buffer, vb);
948 pxa_videobuf_set_actdma(pcdev, buf);
950 pxa_dma_start_channels(pcdev);
952 cicr0 = __raw_readl(pcdev->base + CICR0) | CICR0_EOFM;
953 __raw_writel(cicr0, pcdev->base + CICR0);
959 static int pxa_camera_add_device(struct soc_camera_device *icd)
961 dev_info(icd->parent, "PXA Camera driver attached to camera %d\n",
967 static void pxa_camera_remove_device(struct soc_camera_device *icd)
969 dev_info(icd->parent, "PXA Camera driver detached from camera %d\n",
974 * The following two functions absolutely depend on the fact, that
975 * there can be only one camera on PXA quick capture interface
976 * Called with .host_lock held
978 static int pxa_camera_clock_start(struct soc_camera_host *ici)
980 struct pxa_camera_dev *pcdev = ici->priv;
982 pxa_camera_activate(pcdev);
987 /* Called with .host_lock held */
988 static void pxa_camera_clock_stop(struct soc_camera_host *ici)
990 struct pxa_camera_dev *pcdev = ici->priv;
992 /* disable capture, disable interrupts */
993 __raw_writel(0x3ff, pcdev->base + CICR0);
995 /* Stop DMA engine */
996 DCSR(pcdev->dma_chans[0]) = 0;
997 DCSR(pcdev->dma_chans[1]) = 0;
998 DCSR(pcdev->dma_chans[2]) = 0;
1000 pxa_camera_deactivate(pcdev);
1003 static int test_platform_param(struct pxa_camera_dev *pcdev,
1004 unsigned char buswidth, unsigned long *flags)
1007 * Platform specified synchronization and pixel clock polarities are
1008 * only a recommendation and are only used during probing. The PXA270
1009 * quick capture interface supports both.
1011 *flags = (pcdev->platform_flags & PXA_CAMERA_MASTER ?
1012 V4L2_MBUS_MASTER : V4L2_MBUS_SLAVE) |
1013 V4L2_MBUS_HSYNC_ACTIVE_HIGH |
1014 V4L2_MBUS_HSYNC_ACTIVE_LOW |
1015 V4L2_MBUS_VSYNC_ACTIVE_HIGH |
1016 V4L2_MBUS_VSYNC_ACTIVE_LOW |
1017 V4L2_MBUS_DATA_ACTIVE_HIGH |
1018 V4L2_MBUS_PCLK_SAMPLE_RISING |
1019 V4L2_MBUS_PCLK_SAMPLE_FALLING;
1021 /* If requested data width is supported by the platform, use it */
1022 if ((1 << (buswidth - 1)) & pcdev->width_flags)
1028 static void pxa_camera_setup_cicr(struct soc_camera_device *icd,
1029 unsigned long flags, __u32 pixfmt)
1031 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1032 struct pxa_camera_dev *pcdev = ici->priv;
1033 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1034 unsigned long dw, bpp;
1035 u32 cicr0, cicr1, cicr2, cicr3, cicr4 = 0, y_skip_top;
1036 int ret = v4l2_subdev_call(sd, sensor, g_skip_top_lines, &y_skip_top);
1042 * Datawidth is now guaranteed to be equal to one of the three values.
1043 * We fix bit-per-pixel equal to data-width...
1045 switch (icd->current_fmt->host_fmt->bits_per_sample) {
1056 * Actually it can only be 8 now,
1057 * default is just to silence compiler warnings
1064 if (pcdev->platform_flags & PXA_CAMERA_PCLK_EN)
1065 cicr4 |= CICR4_PCLK_EN;
1066 if (pcdev->platform_flags & PXA_CAMERA_MCLK_EN)
1067 cicr4 |= CICR4_MCLK_EN;
1068 if (flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)
1070 if (flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)
1072 if (flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
1075 cicr0 = __raw_readl(pcdev->base + CICR0);
1076 if (cicr0 & CICR0_ENB)
1077 __raw_writel(cicr0 & ~CICR0_ENB, pcdev->base + CICR0);
1079 cicr1 = CICR1_PPL_VAL(icd->user_width - 1) | bpp | dw;
1082 case V4L2_PIX_FMT_YUV422P:
1083 pcdev->channels = 3;
1084 cicr1 |= CICR1_YCBCR_F;
1086 * Normally, pxa bus wants as input UYVY format. We allow all
1087 * reorderings of the YUV422 format, as no processing is done,
1088 * and the YUV stream is just passed through without any
1089 * transformation. Note that UYVY is the only format that
1090 * should be used if pxa framebuffer Overlay2 is used.
1092 case V4L2_PIX_FMT_UYVY:
1093 case V4L2_PIX_FMT_VYUY:
1094 case V4L2_PIX_FMT_YUYV:
1095 case V4L2_PIX_FMT_YVYU:
1096 cicr1 |= CICR1_COLOR_SP_VAL(2);
1098 case V4L2_PIX_FMT_RGB555:
1099 cicr1 |= CICR1_RGB_BPP_VAL(1) | CICR1_RGBT_CONV_VAL(2) |
1100 CICR1_TBIT | CICR1_COLOR_SP_VAL(1);
1102 case V4L2_PIX_FMT_RGB565:
1103 cicr1 |= CICR1_COLOR_SP_VAL(1) | CICR1_RGB_BPP_VAL(2);
1108 cicr3 = CICR3_LPF_VAL(icd->user_height - 1) |
1109 CICR3_BFW_VAL(min((u32)255, y_skip_top));
1110 cicr4 |= pcdev->mclk_divisor;
1112 __raw_writel(cicr1, pcdev->base + CICR1);
1113 __raw_writel(cicr2, pcdev->base + CICR2);
1114 __raw_writel(cicr3, pcdev->base + CICR3);
1115 __raw_writel(cicr4, pcdev->base + CICR4);
1117 /* CIF interrupts are not used, only DMA */
1118 cicr0 = (cicr0 & CICR0_ENB) | (pcdev->platform_flags & PXA_CAMERA_MASTER ?
1119 CICR0_SIM_MP : (CICR0_SL_CAP_EN | CICR0_SIM_SP));
1120 cicr0 |= CICR0_DMAEN | CICR0_IRQ_MASK;
1121 __raw_writel(cicr0, pcdev->base + CICR0);
1124 static int pxa_camera_set_bus_param(struct soc_camera_device *icd)
1126 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1127 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1128 struct pxa_camera_dev *pcdev = ici->priv;
1129 struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
1130 u32 pixfmt = icd->current_fmt->host_fmt->fourcc;
1131 unsigned long bus_flags, common_flags;
1133 struct pxa_cam *cam = icd->host_priv;
1135 ret = test_platform_param(pcdev, icd->current_fmt->host_fmt->bits_per_sample,
1140 ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
1142 common_flags = soc_mbus_config_compatible(&cfg,
1144 if (!common_flags) {
1145 dev_warn(icd->parent,
1146 "Flags incompatible: camera 0x%x, host 0x%lx\n",
1147 cfg.flags, bus_flags);
1150 } else if (ret != -ENOIOCTLCMD) {
1153 common_flags = bus_flags;
1156 pcdev->channels = 1;
1158 /* Make choises, based on platform preferences */
1159 if ((common_flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH) &&
1160 (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)) {
1161 if (pcdev->platform_flags & PXA_CAMERA_HSP)
1162 common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_HIGH;
1164 common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_LOW;
1167 if ((common_flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH) &&
1168 (common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)) {
1169 if (pcdev->platform_flags & PXA_CAMERA_VSP)
1170 common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_HIGH;
1172 common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_LOW;
1175 if ((common_flags & V4L2_MBUS_PCLK_SAMPLE_RISING) &&
1176 (common_flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)) {
1177 if (pcdev->platform_flags & PXA_CAMERA_PCP)
1178 common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_RISING;
1180 common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_FALLING;
1183 cfg.flags = common_flags;
1184 ret = v4l2_subdev_call(sd, video, s_mbus_config, &cfg);
1185 if (ret < 0 && ret != -ENOIOCTLCMD) {
1186 dev_dbg(icd->parent, "camera s_mbus_config(0x%lx) returned %d\n",
1191 cam->flags = common_flags;
1193 pxa_camera_setup_cicr(icd, common_flags, pixfmt);
1198 static int pxa_camera_try_bus_param(struct soc_camera_device *icd,
1199 unsigned char buswidth)
1201 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1202 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1203 struct pxa_camera_dev *pcdev = ici->priv;
1204 struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
1205 unsigned long bus_flags, common_flags;
1206 int ret = test_platform_param(pcdev, buswidth, &bus_flags);
1211 ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
1213 common_flags = soc_mbus_config_compatible(&cfg,
1215 if (!common_flags) {
1216 dev_warn(icd->parent,
1217 "Flags incompatible: camera 0x%x, host 0x%lx\n",
1218 cfg.flags, bus_flags);
1221 } else if (ret == -ENOIOCTLCMD) {
1228 static const struct soc_mbus_pixelfmt pxa_camera_formats[] = {
1230 .fourcc = V4L2_PIX_FMT_YUV422P,
1231 .name = "Planar YUV422 16 bit",
1232 .bits_per_sample = 8,
1233 .packing = SOC_MBUS_PACKING_2X8_PADHI,
1234 .order = SOC_MBUS_ORDER_LE,
1235 .layout = SOC_MBUS_LAYOUT_PLANAR_2Y_U_V,
1239 /* This will be corrected as we get more formats */
1240 static bool pxa_camera_packing_supported(const struct soc_mbus_pixelfmt *fmt)
1242 return fmt->packing == SOC_MBUS_PACKING_NONE ||
1243 (fmt->bits_per_sample == 8 &&
1244 fmt->packing == SOC_MBUS_PACKING_2X8_PADHI) ||
1245 (fmt->bits_per_sample > 8 &&
1246 fmt->packing == SOC_MBUS_PACKING_EXTEND16);
1249 static int pxa_camera_get_formats(struct soc_camera_device *icd, unsigned int idx,
1250 struct soc_camera_format_xlate *xlate)
1252 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1253 struct device *dev = icd->parent;
1254 int formats = 0, ret;
1255 struct pxa_cam *cam;
1256 struct v4l2_subdev_mbus_code_enum code = {
1257 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1260 const struct soc_mbus_pixelfmt *fmt;
1262 ret = v4l2_subdev_call(sd, pad, enum_mbus_code, NULL, &code);
1264 /* No more formats */
1267 fmt = soc_mbus_get_fmtdesc(code.code);
1269 dev_err(dev, "Invalid format code #%u: %d\n", idx, code.code);
1273 /* This also checks support for the requested bits-per-sample */
1274 ret = pxa_camera_try_bus_param(icd, fmt->bits_per_sample);
1278 if (!icd->host_priv) {
1279 cam = kzalloc(sizeof(*cam), GFP_KERNEL);
1283 icd->host_priv = cam;
1285 cam = icd->host_priv;
1288 switch (code.code) {
1289 case MEDIA_BUS_FMT_UYVY8_2X8:
1292 xlate->host_fmt = &pxa_camera_formats[0];
1293 xlate->code = code.code;
1295 dev_dbg(dev, "Providing format %s using code %d\n",
1296 pxa_camera_formats[0].name, code.code);
1298 case MEDIA_BUS_FMT_VYUY8_2X8:
1299 case MEDIA_BUS_FMT_YUYV8_2X8:
1300 case MEDIA_BUS_FMT_YVYU8_2X8:
1301 case MEDIA_BUS_FMT_RGB565_2X8_LE:
1302 case MEDIA_BUS_FMT_RGB555_2X8_PADHI_LE:
1304 dev_dbg(dev, "Providing format %s packed\n",
1308 if (!pxa_camera_packing_supported(fmt))
1312 "Providing format %s in pass-through mode\n",
1316 /* Generic pass-through */
1319 xlate->host_fmt = fmt;
1320 xlate->code = code.code;
1327 static void pxa_camera_put_formats(struct soc_camera_device *icd)
1329 kfree(icd->host_priv);
1330 icd->host_priv = NULL;
1333 static int pxa_camera_check_frame(u32 width, u32 height)
1335 /* limit to pxa hardware capabilities */
1336 return height < 32 || height > 2048 || width < 48 || width > 2048 ||
1340 static int pxa_camera_set_crop(struct soc_camera_device *icd,
1341 const struct v4l2_crop *a)
1343 const struct v4l2_rect *rect = &a->c;
1344 struct device *dev = icd->parent;
1345 struct soc_camera_host *ici = to_soc_camera_host(dev);
1346 struct pxa_camera_dev *pcdev = ici->priv;
1347 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1348 struct soc_camera_sense sense = {
1349 .master_clock = pcdev->mclk,
1350 .pixel_clock_max = pcdev->ciclk / 4,
1352 struct v4l2_subdev_format fmt = {
1353 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1355 struct v4l2_mbus_framefmt *mf = &fmt.format;
1356 struct pxa_cam *cam = icd->host_priv;
1357 u32 fourcc = icd->current_fmt->host_fmt->fourcc;
1360 /* If PCLK is used to latch data from the sensor, check sense */
1361 if (pcdev->platform_flags & PXA_CAMERA_PCLK_EN)
1362 icd->sense = &sense;
1364 ret = v4l2_subdev_call(sd, video, s_crop, a);
1369 dev_warn(dev, "Failed to crop to %ux%u@%u:%u\n",
1370 rect->width, rect->height, rect->left, rect->top);
1374 ret = v4l2_subdev_call(sd, pad, get_fmt, NULL, &fmt);
1378 if (pxa_camera_check_frame(mf->width, mf->height)) {
1380 * Camera cropping produced a frame beyond our capabilities.
1381 * FIXME: just extract a subframe, that we can process.
1383 v4l_bound_align_image(&mf->width, 48, 2048, 1,
1384 &mf->height, 32, 2048, 0,
1385 fourcc == V4L2_PIX_FMT_YUV422P ? 4 : 0);
1386 ret = v4l2_subdev_call(sd, pad, set_fmt, NULL, &fmt);
1390 if (pxa_camera_check_frame(mf->width, mf->height)) {
1391 dev_warn(icd->parent,
1392 "Inconsistent state. Use S_FMT to repair\n");
1397 if (sense.flags & SOCAM_SENSE_PCLK_CHANGED) {
1398 if (sense.pixel_clock > sense.pixel_clock_max) {
1400 "pixel clock %lu set by the camera too high!",
1404 recalculate_fifo_timeout(pcdev, sense.pixel_clock);
1407 icd->user_width = mf->width;
1408 icd->user_height = mf->height;
1410 pxa_camera_setup_cicr(icd, cam->flags, fourcc);
1415 static int pxa_camera_set_fmt(struct soc_camera_device *icd,
1416 struct v4l2_format *f)
1418 struct device *dev = icd->parent;
1419 struct soc_camera_host *ici = to_soc_camera_host(dev);
1420 struct pxa_camera_dev *pcdev = ici->priv;
1421 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1422 const struct soc_camera_format_xlate *xlate = NULL;
1423 struct soc_camera_sense sense = {
1424 .master_clock = pcdev->mclk,
1425 .pixel_clock_max = pcdev->ciclk / 4,
1427 struct v4l2_pix_format *pix = &f->fmt.pix;
1428 struct v4l2_subdev_format format = {
1429 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1431 struct v4l2_mbus_framefmt *mf = &format.format;
1434 xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
1436 dev_warn(dev, "Format %x not found\n", pix->pixelformat);
1440 /* If PCLK is used to latch data from the sensor, check sense */
1441 if (pcdev->platform_flags & PXA_CAMERA_PCLK_EN)
1442 /* The caller holds a mutex. */
1443 icd->sense = &sense;
1445 mf->width = pix->width;
1446 mf->height = pix->height;
1447 mf->field = pix->field;
1448 mf->colorspace = pix->colorspace;
1449 mf->code = xlate->code;
1451 ret = v4l2_subdev_call(sd, pad, set_fmt, NULL, &format);
1453 if (mf->code != xlate->code)
1459 dev_warn(dev, "Failed to configure for format %x\n",
1461 } else if (pxa_camera_check_frame(mf->width, mf->height)) {
1463 "Camera driver produced an unsupported frame %dx%d\n",
1464 mf->width, mf->height);
1466 } else if (sense.flags & SOCAM_SENSE_PCLK_CHANGED) {
1467 if (sense.pixel_clock > sense.pixel_clock_max) {
1469 "pixel clock %lu set by the camera too high!",
1473 recalculate_fifo_timeout(pcdev, sense.pixel_clock);
1479 pix->width = mf->width;
1480 pix->height = mf->height;
1481 pix->field = mf->field;
1482 pix->colorspace = mf->colorspace;
1483 icd->current_fmt = xlate;
1488 static int pxa_camera_try_fmt(struct soc_camera_device *icd,
1489 struct v4l2_format *f)
1491 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1492 const struct soc_camera_format_xlate *xlate;
1493 struct v4l2_pix_format *pix = &f->fmt.pix;
1494 struct v4l2_subdev_pad_config pad_cfg;
1495 struct v4l2_subdev_format format = {
1496 .which = V4L2_SUBDEV_FORMAT_TRY,
1498 struct v4l2_mbus_framefmt *mf = &format.format;
1499 __u32 pixfmt = pix->pixelformat;
1502 xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1504 dev_warn(icd->parent, "Format %x not found\n", pixfmt);
1509 * Limit to pxa hardware capabilities. YUV422P planar format requires
1510 * images size to be a multiple of 16 bytes. If not, zeros will be
1511 * inserted between Y and U planes, and U and V planes, which violates
1512 * the YUV422P standard.
1514 v4l_bound_align_image(&pix->width, 48, 2048, 1,
1515 &pix->height, 32, 2048, 0,
1516 pixfmt == V4L2_PIX_FMT_YUV422P ? 4 : 0);
1518 /* limit to sensor capabilities */
1519 mf->width = pix->width;
1520 mf->height = pix->height;
1521 /* Only progressive video supported so far */
1522 mf->field = V4L2_FIELD_NONE;
1523 mf->colorspace = pix->colorspace;
1524 mf->code = xlate->code;
1526 ret = v4l2_subdev_call(sd, pad, set_fmt, &pad_cfg, &format);
1530 pix->width = mf->width;
1531 pix->height = mf->height;
1532 pix->colorspace = mf->colorspace;
1534 switch (mf->field) {
1535 case V4L2_FIELD_ANY:
1536 case V4L2_FIELD_NONE:
1537 pix->field = V4L2_FIELD_NONE;
1540 /* TODO: support interlaced at least in pass-through mode */
1541 dev_err(icd->parent, "Field type %d unsupported.\n",
1549 static int pxa_camera_reqbufs(struct soc_camera_device *icd,
1550 struct v4l2_requestbuffers *p)
1555 * This is for locking debugging only. I removed spinlocks and now I
1556 * check whether .prepare is ever called on a linked buffer, or whether
1557 * a dma IRQ can occur for an in-work or unlinked buffer. Until now
1558 * it hadn't triggered
1560 for (i = 0; i < p->count; i++) {
1561 struct pxa_buffer *buf = container_of(icd->vb_vidq.bufs[i],
1562 struct pxa_buffer, vb);
1564 INIT_LIST_HEAD(&buf->vb.queue);
1570 static unsigned int pxa_camera_poll(struct file *file, poll_table *pt)
1572 struct soc_camera_device *icd = file->private_data;
1573 struct pxa_buffer *buf;
1575 buf = list_entry(icd->vb_vidq.stream.next, struct pxa_buffer,
1578 poll_wait(file, &buf->vb.done, pt);
1580 if (buf->vb.state == VIDEOBUF_DONE ||
1581 buf->vb.state == VIDEOBUF_ERROR)
1582 return POLLIN|POLLRDNORM;
1587 static int pxa_camera_querycap(struct soc_camera_host *ici,
1588 struct v4l2_capability *cap)
1590 /* cap->name is set by the firendly caller:-> */
1591 strlcpy(cap->card, pxa_cam_driver_description, sizeof(cap->card));
1592 cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
1593 cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
1598 static int pxa_camera_suspend(struct device *dev)
1600 struct soc_camera_host *ici = to_soc_camera_host(dev);
1601 struct pxa_camera_dev *pcdev = ici->priv;
1604 pcdev->save_cicr[i++] = __raw_readl(pcdev->base + CICR0);
1605 pcdev->save_cicr[i++] = __raw_readl(pcdev->base + CICR1);
1606 pcdev->save_cicr[i++] = __raw_readl(pcdev->base + CICR2);
1607 pcdev->save_cicr[i++] = __raw_readl(pcdev->base + CICR3);
1608 pcdev->save_cicr[i++] = __raw_readl(pcdev->base + CICR4);
1610 if (pcdev->soc_host.icd) {
1611 struct v4l2_subdev *sd = soc_camera_to_subdev(pcdev->soc_host.icd);
1612 ret = v4l2_subdev_call(sd, core, s_power, 0);
1613 if (ret == -ENOIOCTLCMD)
1620 static int pxa_camera_resume(struct device *dev)
1622 struct soc_camera_host *ici = to_soc_camera_host(dev);
1623 struct pxa_camera_dev *pcdev = ici->priv;
1626 DRCMR(68) = pcdev->dma_chans[0] | DRCMR_MAPVLD;
1627 DRCMR(69) = pcdev->dma_chans[1] | DRCMR_MAPVLD;
1628 DRCMR(70) = pcdev->dma_chans[2] | DRCMR_MAPVLD;
1630 __raw_writel(pcdev->save_cicr[i++] & ~CICR0_ENB, pcdev->base + CICR0);
1631 __raw_writel(pcdev->save_cicr[i++], pcdev->base + CICR1);
1632 __raw_writel(pcdev->save_cicr[i++], pcdev->base + CICR2);
1633 __raw_writel(pcdev->save_cicr[i++], pcdev->base + CICR3);
1634 __raw_writel(pcdev->save_cicr[i++], pcdev->base + CICR4);
1636 if (pcdev->soc_host.icd) {
1637 struct v4l2_subdev *sd = soc_camera_to_subdev(pcdev->soc_host.icd);
1638 ret = v4l2_subdev_call(sd, core, s_power, 1);
1639 if (ret == -ENOIOCTLCMD)
1643 /* Restart frame capture if active buffer exists */
1644 if (!ret && pcdev->active)
1645 pxa_camera_start_capture(pcdev);
1650 static struct soc_camera_host_ops pxa_soc_camera_host_ops = {
1651 .owner = THIS_MODULE,
1652 .add = pxa_camera_add_device,
1653 .remove = pxa_camera_remove_device,
1654 .clock_start = pxa_camera_clock_start,
1655 .clock_stop = pxa_camera_clock_stop,
1656 .set_crop = pxa_camera_set_crop,
1657 .get_formats = pxa_camera_get_formats,
1658 .put_formats = pxa_camera_put_formats,
1659 .set_fmt = pxa_camera_set_fmt,
1660 .try_fmt = pxa_camera_try_fmt,
1661 .init_videobuf = pxa_camera_init_videobuf,
1662 .reqbufs = pxa_camera_reqbufs,
1663 .poll = pxa_camera_poll,
1664 .querycap = pxa_camera_querycap,
1665 .set_bus_param = pxa_camera_set_bus_param,
1668 static int pxa_camera_pdata_from_dt(struct device *dev,
1669 struct pxa_camera_dev *pcdev)
1672 struct device_node *np = dev->of_node;
1673 struct v4l2_of_endpoint ep;
1674 int err = of_property_read_u32(np, "clock-frequency",
1677 pcdev->platform_flags |= PXA_CAMERA_MCLK_EN;
1678 pcdev->mclk = mclk_rate;
1681 np = of_graph_get_next_endpoint(np, NULL);
1683 dev_err(dev, "could not find endpoint\n");
1687 err = v4l2_of_parse_endpoint(np, &ep);
1689 dev_err(dev, "could not parse endpoint\n");
1693 switch (ep.bus.parallel.bus_width) {
1695 pcdev->platform_flags |= PXA_CAMERA_DATAWIDTH_4;
1698 pcdev->platform_flags |= PXA_CAMERA_DATAWIDTH_5;
1701 pcdev->platform_flags |= PXA_CAMERA_DATAWIDTH_8;
1704 pcdev->platform_flags |= PXA_CAMERA_DATAWIDTH_9;
1707 pcdev->platform_flags |= PXA_CAMERA_DATAWIDTH_10;
1713 if (ep.bus.parallel.flags & V4L2_MBUS_MASTER)
1714 pcdev->platform_flags |= PXA_CAMERA_MASTER;
1715 if (ep.bus.parallel.flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH)
1716 pcdev->platform_flags |= PXA_CAMERA_HSP;
1717 if (ep.bus.parallel.flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH)
1718 pcdev->platform_flags |= PXA_CAMERA_VSP;
1719 if (ep.bus.parallel.flags & V4L2_MBUS_PCLK_SAMPLE_RISING)
1720 pcdev->platform_flags |= PXA_CAMERA_PCLK_EN | PXA_CAMERA_PCP;
1721 if (ep.bus.parallel.flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)
1722 pcdev->platform_flags |= PXA_CAMERA_PCLK_EN;
1730 static int pxa_camera_probe(struct platform_device *pdev)
1732 struct pxa_camera_dev *pcdev;
1733 struct resource *res;
1738 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1739 irq = platform_get_irq(pdev, 0);
1740 if (!res || irq < 0)
1743 pcdev = devm_kzalloc(&pdev->dev, sizeof(*pcdev), GFP_KERNEL);
1745 dev_err(&pdev->dev, "Could not allocate pcdev\n");
1749 pcdev->clk = devm_clk_get(&pdev->dev, NULL);
1750 if (IS_ERR(pcdev->clk))
1751 return PTR_ERR(pcdev->clk);
1755 pcdev->pdata = pdev->dev.platform_data;
1756 if (&pdev->dev.of_node && !pcdev->pdata) {
1757 err = pxa_camera_pdata_from_dt(&pdev->dev, pcdev);
1759 pcdev->platform_flags = pcdev->pdata->flags;
1760 pcdev->mclk = pcdev->pdata->mclk_10khz * 10000;
1765 if (!(pcdev->platform_flags & (PXA_CAMERA_DATAWIDTH_8 |
1766 PXA_CAMERA_DATAWIDTH_9 | PXA_CAMERA_DATAWIDTH_10))) {
1768 * Platform hasn't set available data widths. This is bad.
1769 * Warn and use a default.
1771 dev_warn(&pdev->dev, "WARNING! Platform hasn't set available "
1772 "data widths, using default 10 bit\n");
1773 pcdev->platform_flags |= PXA_CAMERA_DATAWIDTH_10;
1775 if (pcdev->platform_flags & PXA_CAMERA_DATAWIDTH_8)
1776 pcdev->width_flags = 1 << 7;
1777 if (pcdev->platform_flags & PXA_CAMERA_DATAWIDTH_9)
1778 pcdev->width_flags |= 1 << 8;
1779 if (pcdev->platform_flags & PXA_CAMERA_DATAWIDTH_10)
1780 pcdev->width_flags |= 1 << 9;
1782 dev_warn(&pdev->dev,
1783 "mclk == 0! Please, fix your platform data. "
1784 "Using default 20MHz\n");
1785 pcdev->mclk = 20000000;
1788 pcdev->mclk_divisor = mclk_get_divisor(pdev, pcdev);
1790 INIT_LIST_HEAD(&pcdev->capture);
1791 spin_lock_init(&pcdev->lock);
1794 * Request the regions.
1796 base = devm_ioremap_resource(&pdev->dev, res);
1798 return PTR_ERR(base);
1804 err = pxa_request_dma("CI_Y", DMA_PRIO_HIGH,
1805 pxa_camera_dma_irq_y, pcdev);
1807 dev_err(&pdev->dev, "Can't request DMA for Y\n");
1810 pcdev->dma_chans[0] = err;
1811 dev_dbg(&pdev->dev, "got DMA channel %d\n", pcdev->dma_chans[0]);
1813 err = pxa_request_dma("CI_U", DMA_PRIO_HIGH,
1814 pxa_camera_dma_irq_u, pcdev);
1816 dev_err(&pdev->dev, "Can't request DMA for U\n");
1817 goto exit_free_dma_y;
1819 pcdev->dma_chans[1] = err;
1820 dev_dbg(&pdev->dev, "got DMA channel (U) %d\n", pcdev->dma_chans[1]);
1822 err = pxa_request_dma("CI_V", DMA_PRIO_HIGH,
1823 pxa_camera_dma_irq_v, pcdev);
1825 dev_err(&pdev->dev, "Can't request DMA for V\n");
1826 goto exit_free_dma_u;
1828 pcdev->dma_chans[2] = err;
1829 dev_dbg(&pdev->dev, "got DMA channel (V) %d\n", pcdev->dma_chans[2]);
1831 DRCMR(68) = pcdev->dma_chans[0] | DRCMR_MAPVLD;
1832 DRCMR(69) = pcdev->dma_chans[1] | DRCMR_MAPVLD;
1833 DRCMR(70) = pcdev->dma_chans[2] | DRCMR_MAPVLD;
1836 err = devm_request_irq(&pdev->dev, pcdev->irq, pxa_camera_irq, 0,
1837 PXA_CAM_DRV_NAME, pcdev);
1839 dev_err(&pdev->dev, "Camera interrupt register failed\n");
1843 pcdev->soc_host.drv_name = PXA_CAM_DRV_NAME;
1844 pcdev->soc_host.ops = &pxa_soc_camera_host_ops;
1845 pcdev->soc_host.priv = pcdev;
1846 pcdev->soc_host.v4l2_dev.dev = &pdev->dev;
1847 pcdev->soc_host.nr = pdev->id;
1849 err = soc_camera_host_register(&pcdev->soc_host);
1856 pxa_free_dma(pcdev->dma_chans[2]);
1858 pxa_free_dma(pcdev->dma_chans[1]);
1860 pxa_free_dma(pcdev->dma_chans[0]);
1864 static int pxa_camera_remove(struct platform_device *pdev)
1866 struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
1867 struct pxa_camera_dev *pcdev = container_of(soc_host,
1868 struct pxa_camera_dev, soc_host);
1870 pxa_free_dma(pcdev->dma_chans[0]);
1871 pxa_free_dma(pcdev->dma_chans[1]);
1872 pxa_free_dma(pcdev->dma_chans[2]);
1874 soc_camera_host_unregister(soc_host);
1876 dev_info(&pdev->dev, "PXA Camera driver unloaded\n");
1881 static const struct dev_pm_ops pxa_camera_pm = {
1882 .suspend = pxa_camera_suspend,
1883 .resume = pxa_camera_resume,
1886 static const struct of_device_id pxa_camera_of_match[] = {
1887 { .compatible = "marvell,pxa270-qci", },
1890 MODULE_DEVICE_TABLE(of, pxa_camera_of_match);
1892 static struct platform_driver pxa_camera_driver = {
1894 .name = PXA_CAM_DRV_NAME,
1895 .pm = &pxa_camera_pm,
1896 .of_match_table = of_match_ptr(pxa_camera_of_match),
1898 .probe = pxa_camera_probe,
1899 .remove = pxa_camera_remove,
1902 module_platform_driver(pxa_camera_driver);
1904 MODULE_DESCRIPTION("PXA27x SoC Camera Host driver");
1905 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
1906 MODULE_LICENSE("GPL");
1907 MODULE_VERSION(PXA_CAM_VERSION);
1908 MODULE_ALIAS("platform:" PXA_CAM_DRV_NAME);