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/errno.h>
20 #include <linux/interrupt.h>
21 #include <linux/kernel.h>
23 #include <linux/moduleparam.h>
24 #include <linux/time.h>
25 #include <linux/device.h>
26 #include <linux/platform_device.h>
27 #include <linux/clk.h>
28 #include <linux/sched.h>
29 #include <linux/slab.h>
31 #include <media/v4l2-common.h>
32 #include <media/v4l2-dev.h>
33 #include <media/videobuf-dma-sg.h>
34 #include <media/soc_camera.h>
35 #include <media/soc_mediabus.h>
37 #include <linux/videodev2.h>
40 #include <mach/camera.h>
42 #define PXA_CAM_VERSION "0.0.6"
43 #define PXA_CAM_DRV_NAME "pxa27x-camera"
45 /* Camera Interface */
58 #define CICR0_DMAEN (1 << 31) /* DMA request enable */
59 #define CICR0_PAR_EN (1 << 30) /* Parity enable */
60 #define CICR0_SL_CAP_EN (1 << 29) /* Capture enable for slave mode */
61 #define CICR0_ENB (1 << 28) /* Camera interface enable */
62 #define CICR0_DIS (1 << 27) /* Camera interface disable */
63 #define CICR0_SIM (0x7 << 24) /* Sensor interface mode mask */
64 #define CICR0_TOM (1 << 9) /* Time-out mask */
65 #define CICR0_RDAVM (1 << 8) /* Receive-data-available mask */
66 #define CICR0_FEM (1 << 7) /* FIFO-empty mask */
67 #define CICR0_EOLM (1 << 6) /* End-of-line mask */
68 #define CICR0_PERRM (1 << 5) /* Parity-error mask */
69 #define CICR0_QDM (1 << 4) /* Quick-disable mask */
70 #define CICR0_CDM (1 << 3) /* Disable-done mask */
71 #define CICR0_SOFM (1 << 2) /* Start-of-frame mask */
72 #define CICR0_EOFM (1 << 1) /* End-of-frame mask */
73 #define CICR0_FOM (1 << 0) /* FIFO-overrun mask */
75 #define CICR1_TBIT (1 << 31) /* Transparency bit */
76 #define CICR1_RGBT_CONV (0x3 << 29) /* RGBT conversion mask */
77 #define CICR1_PPL (0x7ff << 15) /* Pixels per line mask */
78 #define CICR1_RGB_CONV (0x7 << 12) /* RGB conversion mask */
79 #define CICR1_RGB_F (1 << 11) /* RGB format */
80 #define CICR1_YCBCR_F (1 << 10) /* YCbCr format */
81 #define CICR1_RGB_BPP (0x7 << 7) /* RGB bis per pixel mask */
82 #define CICR1_RAW_BPP (0x3 << 5) /* Raw bis per pixel mask */
83 #define CICR1_COLOR_SP (0x3 << 3) /* Color space mask */
84 #define CICR1_DW (0x7 << 0) /* Data width mask */
86 #define CICR2_BLW (0xff << 24) /* Beginning-of-line pixel clock
88 #define CICR2_ELW (0xff << 16) /* End-of-line pixel clock
90 #define CICR2_HSW (0x3f << 10) /* Horizontal sync pulse width mask */
91 #define CICR2_BFPW (0x3f << 3) /* Beginning-of-frame pixel clock
93 #define CICR2_FSW (0x7 << 0) /* Frame stabilization
96 #define CICR3_BFW (0xff << 24) /* Beginning-of-frame line clock
98 #define CICR3_EFW (0xff << 16) /* End-of-frame line clock
100 #define CICR3_VSW (0x3f << 10) /* Vertical sync pulse width mask */
101 #define CICR3_BFPW (0x3f << 3) /* Beginning-of-frame pixel clock
103 #define CICR3_LPF (0x7ff << 0) /* Lines per frame mask */
105 #define CICR4_MCLK_DLY (0x3 << 24) /* MCLK Data Capture Delay mask */
106 #define CICR4_PCLK_EN (1 << 23) /* Pixel clock enable */
107 #define CICR4_PCP (1 << 22) /* Pixel clock polarity */
108 #define CICR4_HSP (1 << 21) /* Horizontal sync polarity */
109 #define CICR4_VSP (1 << 20) /* Vertical sync polarity */
110 #define CICR4_MCLK_EN (1 << 19) /* MCLK enable */
111 #define CICR4_FR_RATE (0x7 << 8) /* Frame rate mask */
112 #define CICR4_DIV (0xff << 0) /* Clock divisor mask */
114 #define CISR_FTO (1 << 15) /* FIFO time-out */
115 #define CISR_RDAV_2 (1 << 14) /* Channel 2 receive data available */
116 #define CISR_RDAV_1 (1 << 13) /* Channel 1 receive data available */
117 #define CISR_RDAV_0 (1 << 12) /* Channel 0 receive data available */
118 #define CISR_FEMPTY_2 (1 << 11) /* Channel 2 FIFO empty */
119 #define CISR_FEMPTY_1 (1 << 10) /* Channel 1 FIFO empty */
120 #define CISR_FEMPTY_0 (1 << 9) /* Channel 0 FIFO empty */
121 #define CISR_EOL (1 << 8) /* End of line */
122 #define CISR_PAR_ERR (1 << 7) /* Parity error */
123 #define CISR_CQD (1 << 6) /* Camera interface quick disable */
124 #define CISR_CDD (1 << 5) /* Camera interface disable done */
125 #define CISR_SOF (1 << 4) /* Start of frame */
126 #define CISR_EOF (1 << 3) /* End of frame */
127 #define CISR_IFO_2 (1 << 2) /* FIFO overrun for Channel 2 */
128 #define CISR_IFO_1 (1 << 1) /* FIFO overrun for Channel 1 */
129 #define CISR_IFO_0 (1 << 0) /* FIFO overrun for Channel 0 */
131 #define CIFR_FLVL2 (0x7f << 23) /* FIFO 2 level mask */
132 #define CIFR_FLVL1 (0x7f << 16) /* FIFO 1 level mask */
133 #define CIFR_FLVL0 (0xff << 8) /* FIFO 0 level mask */
134 #define CIFR_THL_0 (0x3 << 4) /* Threshold Level for Channel 0 FIFO */
135 #define CIFR_RESET_F (1 << 3) /* Reset input FIFOs */
136 #define CIFR_FEN2 (1 << 2) /* FIFO enable for channel 2 */
137 #define CIFR_FEN1 (1 << 1) /* FIFO enable for channel 1 */
138 #define CIFR_FEN0 (1 << 0) /* FIFO enable for channel 0 */
140 #define CICR0_SIM_MP (0 << 24)
141 #define CICR0_SIM_SP (1 << 24)
142 #define CICR0_SIM_MS (2 << 24)
143 #define CICR0_SIM_EP (3 << 24)
144 #define CICR0_SIM_ES (4 << 24)
146 #define CICR1_DW_VAL(x) ((x) & CICR1_DW) /* Data bus width */
147 #define CICR1_PPL_VAL(x) (((x) << 15) & CICR1_PPL) /* Pixels per line */
148 #define CICR1_COLOR_SP_VAL(x) (((x) << 3) & CICR1_COLOR_SP) /* color space */
149 #define CICR1_RGB_BPP_VAL(x) (((x) << 7) & CICR1_RGB_BPP) /* bpp for rgb */
150 #define CICR1_RGBT_CONV_VAL(x) (((x) << 29) & CICR1_RGBT_CONV) /* rgbt conv */
152 #define CICR2_BLW_VAL(x) (((x) << 24) & CICR2_BLW) /* Beginning-of-line pixel clock wait count */
153 #define CICR2_ELW_VAL(x) (((x) << 16) & CICR2_ELW) /* End-of-line pixel clock wait count */
154 #define CICR2_HSW_VAL(x) (((x) << 10) & CICR2_HSW) /* Horizontal sync pulse width */
155 #define CICR2_BFPW_VAL(x) (((x) << 3) & CICR2_BFPW) /* Beginning-of-frame pixel clock wait count */
156 #define CICR2_FSW_VAL(x) (((x) << 0) & CICR2_FSW) /* Frame stabilization wait count */
158 #define CICR3_BFW_VAL(x) (((x) << 24) & CICR3_BFW) /* Beginning-of-frame line clock wait count */
159 #define CICR3_EFW_VAL(x) (((x) << 16) & CICR3_EFW) /* End-of-frame line clock wait count */
160 #define CICR3_VSW_VAL(x) (((x) << 11) & CICR3_VSW) /* Vertical sync pulse width */
161 #define CICR3_LPF_VAL(x) (((x) << 0) & CICR3_LPF) /* Lines per frame */
163 #define CICR0_IRQ_MASK (CICR0_TOM | CICR0_RDAVM | CICR0_FEM | CICR0_EOLM | \
164 CICR0_PERRM | CICR0_QDM | CICR0_CDM | CICR0_SOFM | \
165 CICR0_EOFM | CICR0_FOM)
170 enum pxa_camera_active_dma
{
176 /* descriptor needed for the PXA DMA engine */
179 struct pxa_dma_desc
*sg_cpu
;
184 /* buffer for one video frame */
186 /* common v4l buffer stuff -- must be first */
187 struct videobuf_buffer vb
;
188 enum v4l2_mbus_pixelcode code
;
189 /* our descriptor lists for Y, U and V channels */
190 struct pxa_cam_dma dmas
[3];
192 enum pxa_camera_active_dma active_dma
;
195 struct pxa_camera_dev
{
196 struct soc_camera_host soc_host
;
198 * PXA27x is only supposed to handle one camera on its Quick Capture
199 * interface. If anyone ever builds hardware to enable more than
200 * one camera, they will have to modify this driver too
202 struct soc_camera_device
*icd
;
209 unsigned int dma_chans
[3];
211 struct pxacamera_platform_data
*pdata
;
212 struct resource
*res
;
213 unsigned long platform_flags
;
217 u16 width_flags
; /* max 10 bits */
219 struct list_head capture
;
223 struct pxa_buffer
*active
;
224 struct pxa_dma_desc
*sg_tail
[3];
233 static const char *pxa_cam_driver_description
= "PXA_Camera";
235 static unsigned int vid_limit
= 16; /* Video memory limit, in Mb */
238 * Videobuf operations
240 static int pxa_videobuf_setup(struct videobuf_queue
*vq
, unsigned int *count
,
243 struct soc_camera_device
*icd
= vq
->priv_data
;
244 int bytes_per_line
= soc_mbus_bytes_per_line(icd
->user_width
,
245 icd
->current_fmt
->host_fmt
);
247 if (bytes_per_line
< 0)
248 return bytes_per_line
;
250 dev_dbg(icd
->parent
, "count=%d, size=%d\n", *count
, *size
);
252 *size
= bytes_per_line
* icd
->user_height
;
256 if (*size
* *count
> vid_limit
* 1024 * 1024)
257 *count
= (vid_limit
* 1024 * 1024) / *size
;
262 static void free_buffer(struct videobuf_queue
*vq
, struct pxa_buffer
*buf
)
264 struct soc_camera_device
*icd
= vq
->priv_data
;
265 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->parent
);
266 struct videobuf_dmabuf
*dma
= videobuf_to_dma(&buf
->vb
);
269 BUG_ON(in_interrupt());
271 dev_dbg(icd
->parent
, "%s (vb=0x%p) 0x%08lx %d\n", __func__
,
272 &buf
->vb
, buf
->vb
.baddr
, buf
->vb
.bsize
);
275 * This waits until this buffer is out of danger, i.e., until it is no
276 * longer in STATE_QUEUED or STATE_ACTIVE
278 videobuf_waiton(vq
, &buf
->vb
, 0, 0);
279 videobuf_dma_unmap(vq
->dev
, dma
);
280 videobuf_dma_free(dma
);
282 for (i
= 0; i
< ARRAY_SIZE(buf
->dmas
); i
++) {
283 if (buf
->dmas
[i
].sg_cpu
)
284 dma_free_coherent(ici
->v4l2_dev
.dev
,
285 buf
->dmas
[i
].sg_size
,
287 buf
->dmas
[i
].sg_dma
);
288 buf
->dmas
[i
].sg_cpu
= NULL
;
291 buf
->vb
.state
= VIDEOBUF_NEEDS_INIT
;
294 static int calculate_dma_sglen(struct scatterlist
*sglist
, int sglen
,
295 int sg_first_ofs
, int size
)
297 int i
, offset
, dma_len
, xfer_len
;
298 struct scatterlist
*sg
;
300 offset
= sg_first_ofs
;
301 for_each_sg(sglist
, sg
, sglen
, i
) {
302 dma_len
= sg_dma_len(sg
);
304 /* PXA27x Developer's Manual 27.4.4.1: round up to 8 bytes */
305 xfer_len
= roundup(min(dma_len
- offset
, size
), 8);
307 size
= max(0, size
- xfer_len
);
318 * pxa_init_dma_channel - init dma descriptors
319 * @pcdev: pxa camera device
320 * @buf: pxa buffer to find pxa dma channel
321 * @dma: dma video buffer
322 * @channel: dma channel (0 => 'Y', 1 => 'U', 2 => 'V')
323 * @cibr: camera Receive Buffer Register
324 * @size: bytes to transfer
325 * @sg_first: first element of sg_list
326 * @sg_first_ofs: offset in first element of sg_list
328 * Prepares the pxa dma descriptors to transfer one camera channel.
329 * Beware sg_first and sg_first_ofs are both input and output parameters.
331 * Returns 0 or -ENOMEM if no coherent memory is available
333 static int pxa_init_dma_channel(struct pxa_camera_dev
*pcdev
,
334 struct pxa_buffer
*buf
,
335 struct videobuf_dmabuf
*dma
, int channel
,
337 struct scatterlist
**sg_first
, int *sg_first_ofs
)
339 struct pxa_cam_dma
*pxa_dma
= &buf
->dmas
[channel
];
340 struct device
*dev
= pcdev
->soc_host
.v4l2_dev
.dev
;
341 struct scatterlist
*sg
;
342 int i
, offset
, sglen
;
343 int dma_len
= 0, xfer_len
= 0;
346 dma_free_coherent(dev
, pxa_dma
->sg_size
,
347 pxa_dma
->sg_cpu
, pxa_dma
->sg_dma
);
349 sglen
= calculate_dma_sglen(*sg_first
, dma
->sglen
,
350 *sg_first_ofs
, size
);
352 pxa_dma
->sg_size
= (sglen
+ 1) * sizeof(struct pxa_dma_desc
);
353 pxa_dma
->sg_cpu
= dma_alloc_coherent(dev
, pxa_dma
->sg_size
,
354 &pxa_dma
->sg_dma
, GFP_KERNEL
);
355 if (!pxa_dma
->sg_cpu
)
358 pxa_dma
->sglen
= sglen
;
359 offset
= *sg_first_ofs
;
361 dev_dbg(dev
, "DMA: sg_first=%p, sglen=%d, ofs=%d, dma.desc=%x\n",
362 *sg_first
, sglen
, *sg_first_ofs
, pxa_dma
->sg_dma
);
365 for_each_sg(*sg_first
, sg
, sglen
, i
) {
366 dma_len
= sg_dma_len(sg
);
368 /* PXA27x Developer's Manual 27.4.4.1: round up to 8 bytes */
369 xfer_len
= roundup(min(dma_len
- offset
, size
), 8);
371 size
= max(0, size
- xfer_len
);
373 pxa_dma
->sg_cpu
[i
].dsadr
= pcdev
->res
->start
+ cibr
;
374 pxa_dma
->sg_cpu
[i
].dtadr
= sg_dma_address(sg
) + offset
;
375 pxa_dma
->sg_cpu
[i
].dcmd
=
376 DCMD_FLOWSRC
| DCMD_BURST8
| DCMD_INCTRGADDR
| xfer_len
;
379 pxa_dma
->sg_cpu
[i
].dcmd
|= DCMD_STARTIRQEN
;
381 pxa_dma
->sg_cpu
[i
].ddadr
=
382 pxa_dma
->sg_dma
+ (i
+ 1) * sizeof(struct pxa_dma_desc
);
384 dev_vdbg(dev
, "DMA: desc.%08x->@phys=0x%08x, len=%d\n",
385 pxa_dma
->sg_dma
+ i
* sizeof(struct pxa_dma_desc
),
386 sg_dma_address(sg
) + offset
, xfer_len
);
393 pxa_dma
->sg_cpu
[sglen
].ddadr
= DDADR_STOP
;
394 pxa_dma
->sg_cpu
[sglen
].dcmd
= DCMD_FLOWSRC
| DCMD_BURST8
| DCMD_ENDIRQEN
;
397 * Handle 1 special case :
398 * - in 3 planes (YUV422P format), we might finish with xfer_len equal
399 * to dma_len (end on PAGE boundary). In this case, the sg element
400 * for next plane should be the next after the last used to store the
401 * last scatter gather RAM page
403 if (xfer_len
>= dma_len
) {
404 *sg_first_ofs
= xfer_len
- dma_len
;
405 *sg_first
= sg_next(sg
);
407 *sg_first_ofs
= xfer_len
;
414 static void pxa_videobuf_set_actdma(struct pxa_camera_dev
*pcdev
,
415 struct pxa_buffer
*buf
)
417 buf
->active_dma
= DMA_Y
;
418 if (pcdev
->channels
== 3)
419 buf
->active_dma
|= DMA_U
| DMA_V
;
423 * Please check the DMA prepared buffer structure in :
424 * Documentation/video4linux/pxa_camera.txt
425 * Please check also in pxa_camera_check_link_miss() to understand why DMA chain
426 * modification while DMA chain is running will work anyway.
428 static int pxa_videobuf_prepare(struct videobuf_queue
*vq
,
429 struct videobuf_buffer
*vb
, enum v4l2_field field
)
431 struct soc_camera_device
*icd
= vq
->priv_data
;
432 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->parent
);
433 struct pxa_camera_dev
*pcdev
= ici
->priv
;
434 struct device
*dev
= pcdev
->soc_host
.v4l2_dev
.dev
;
435 struct pxa_buffer
*buf
= container_of(vb
, struct pxa_buffer
, vb
);
437 int size_y
, size_u
= 0, size_v
= 0;
438 int bytes_per_line
= soc_mbus_bytes_per_line(icd
->user_width
,
439 icd
->current_fmt
->host_fmt
);
441 if (bytes_per_line
< 0)
442 return bytes_per_line
;
444 dev_dbg(dev
, "%s (vb=0x%p) 0x%08lx %d\n", __func__
,
445 vb
, vb
->baddr
, vb
->bsize
);
447 /* Added list head initialization on alloc */
448 WARN_ON(!list_empty(&vb
->queue
));
452 * This can be useful if you want to see if we actually fill
453 * the buffer with something
455 memset((void *)vb
->baddr
, 0xaa, vb
->bsize
);
458 BUG_ON(NULL
== icd
->current_fmt
);
461 * I think, in buf_prepare you only have to protect global data,
462 * the actual buffer is yours
466 if (buf
->code
!= icd
->current_fmt
->code
||
467 vb
->width
!= icd
->user_width
||
468 vb
->height
!= icd
->user_height
||
469 vb
->field
!= field
) {
470 buf
->code
= icd
->current_fmt
->code
;
471 vb
->width
= icd
->user_width
;
472 vb
->height
= icd
->user_height
;
474 vb
->state
= VIDEOBUF_NEEDS_INIT
;
477 vb
->size
= bytes_per_line
* vb
->height
;
478 if (0 != vb
->baddr
&& vb
->bsize
< vb
->size
) {
483 if (vb
->state
== VIDEOBUF_NEEDS_INIT
) {
486 struct videobuf_dmabuf
*dma
= videobuf_to_dma(vb
);
487 struct scatterlist
*sg
;
489 ret
= videobuf_iolock(vq
, vb
, NULL
);
493 if (pcdev
->channels
== 3) {
495 size_u
= size_v
= size
/ 4;
502 /* init DMA for Y channel */
503 ret
= pxa_init_dma_channel(pcdev
, buf
, dma
, 0, CIBR0
, size_y
,
506 dev_err(dev
, "DMA initialization for Y/RGB failed\n");
510 /* init DMA for U channel */
512 ret
= pxa_init_dma_channel(pcdev
, buf
, dma
, 1, CIBR1
,
513 size_u
, &sg
, &next_ofs
);
515 dev_err(dev
, "DMA initialization for U failed\n");
519 /* init DMA for V channel */
521 ret
= pxa_init_dma_channel(pcdev
, buf
, dma
, 2, CIBR2
,
522 size_v
, &sg
, &next_ofs
);
524 dev_err(dev
, "DMA initialization for V failed\n");
528 vb
->state
= VIDEOBUF_PREPARED
;
532 pxa_videobuf_set_actdma(pcdev
, buf
);
537 dma_free_coherent(dev
, buf
->dmas
[1].sg_size
,
538 buf
->dmas
[1].sg_cpu
, buf
->dmas
[1].sg_dma
);
540 dma_free_coherent(dev
, buf
->dmas
[0].sg_size
,
541 buf
->dmas
[0].sg_cpu
, buf
->dmas
[0].sg_dma
);
543 free_buffer(vq
, buf
);
550 * pxa_dma_start_channels - start DMA channel for active buffer
551 * @pcdev: pxa camera device
553 * Initialize DMA channels to the beginning of the active video buffer, and
554 * start these channels.
556 static void pxa_dma_start_channels(struct pxa_camera_dev
*pcdev
)
559 struct pxa_buffer
*active
;
561 active
= pcdev
->active
;
563 for (i
= 0; i
< pcdev
->channels
; i
++) {
564 dev_dbg(pcdev
->soc_host
.v4l2_dev
.dev
,
565 "%s (channel=%d) ddadr=%08x\n", __func__
,
566 i
, active
->dmas
[i
].sg_dma
);
567 DDADR(pcdev
->dma_chans
[i
]) = active
->dmas
[i
].sg_dma
;
568 DCSR(pcdev
->dma_chans
[i
]) = DCSR_RUN
;
572 static void pxa_dma_stop_channels(struct pxa_camera_dev
*pcdev
)
576 for (i
= 0; i
< pcdev
->channels
; i
++) {
577 dev_dbg(pcdev
->soc_host
.v4l2_dev
.dev
,
578 "%s (channel=%d)\n", __func__
, i
);
579 DCSR(pcdev
->dma_chans
[i
]) = 0;
583 static void pxa_dma_add_tail_buf(struct pxa_camera_dev
*pcdev
,
584 struct pxa_buffer
*buf
)
587 struct pxa_dma_desc
*buf_last_desc
;
589 for (i
= 0; i
< pcdev
->channels
; i
++) {
590 buf_last_desc
= buf
->dmas
[i
].sg_cpu
+ buf
->dmas
[i
].sglen
;
591 buf_last_desc
->ddadr
= DDADR_STOP
;
593 if (pcdev
->sg_tail
[i
])
594 /* Link the new buffer to the old tail */
595 pcdev
->sg_tail
[i
]->ddadr
= buf
->dmas
[i
].sg_dma
;
597 /* Update the channel tail */
598 pcdev
->sg_tail
[i
] = buf_last_desc
;
603 * pxa_camera_start_capture - start video capturing
604 * @pcdev: camera device
606 * Launch capturing. DMA channels should not be active yet. They should get
607 * activated at the end of frame interrupt, to capture only whole frames, and
608 * never begin the capture of a partial frame.
610 static void pxa_camera_start_capture(struct pxa_camera_dev
*pcdev
)
614 dev_dbg(pcdev
->soc_host
.v4l2_dev
.dev
, "%s\n", __func__
);
615 /* Enable End-Of-Frame Interrupt */
616 cicr0
= __raw_readl(pcdev
->base
+ CICR0
) | CICR0_ENB
;
617 cicr0
&= ~CICR0_EOFM
;
618 __raw_writel(cicr0
, pcdev
->base
+ CICR0
);
621 static void pxa_camera_stop_capture(struct pxa_camera_dev
*pcdev
)
625 pxa_dma_stop_channels(pcdev
);
627 cicr0
= __raw_readl(pcdev
->base
+ CICR0
) & ~CICR0_ENB
;
628 __raw_writel(cicr0
, pcdev
->base
+ CICR0
);
630 pcdev
->active
= NULL
;
631 dev_dbg(pcdev
->soc_host
.v4l2_dev
.dev
, "%s\n", __func__
);
634 /* Called under spinlock_irqsave(&pcdev->lock, ...) */
635 static void pxa_videobuf_queue(struct videobuf_queue
*vq
,
636 struct videobuf_buffer
*vb
)
638 struct soc_camera_device
*icd
= vq
->priv_data
;
639 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->parent
);
640 struct pxa_camera_dev
*pcdev
= ici
->priv
;
641 struct pxa_buffer
*buf
= container_of(vb
, struct pxa_buffer
, vb
);
643 dev_dbg(icd
->parent
, "%s (vb=0x%p) 0x%08lx %d active=%p\n",
644 __func__
, vb
, vb
->baddr
, vb
->bsize
, pcdev
->active
);
646 list_add_tail(&vb
->queue
, &pcdev
->capture
);
648 vb
->state
= VIDEOBUF_ACTIVE
;
649 pxa_dma_add_tail_buf(pcdev
, buf
);
652 pxa_camera_start_capture(pcdev
);
655 static void pxa_videobuf_release(struct videobuf_queue
*vq
,
656 struct videobuf_buffer
*vb
)
658 struct pxa_buffer
*buf
= container_of(vb
, struct pxa_buffer
, vb
);
660 struct soc_camera_device
*icd
= vq
->priv_data
;
661 struct device
*dev
= icd
->parent
;
663 dev_dbg(dev
, "%s (vb=0x%p) 0x%08lx %d\n", __func__
,
664 vb
, vb
->baddr
, vb
->bsize
);
667 case VIDEOBUF_ACTIVE
:
668 dev_dbg(dev
, "%s (active)\n", __func__
);
670 case VIDEOBUF_QUEUED
:
671 dev_dbg(dev
, "%s (queued)\n", __func__
);
673 case VIDEOBUF_PREPARED
:
674 dev_dbg(dev
, "%s (prepared)\n", __func__
);
677 dev_dbg(dev
, "%s (unknown)\n", __func__
);
682 free_buffer(vq
, buf
);
685 static void pxa_camera_wakeup(struct pxa_camera_dev
*pcdev
,
686 struct videobuf_buffer
*vb
,
687 struct pxa_buffer
*buf
)
691 /* _init is used to debug races, see comment in pxa_camera_reqbufs() */
692 list_del_init(&vb
->queue
);
693 vb
->state
= VIDEOBUF_DONE
;
694 do_gettimeofday(&vb
->ts
);
697 dev_dbg(pcdev
->soc_host
.v4l2_dev
.dev
, "%s dequeud buffer (vb=0x%p)\n",
700 if (list_empty(&pcdev
->capture
)) {
701 pxa_camera_stop_capture(pcdev
);
702 for (i
= 0; i
< pcdev
->channels
; i
++)
703 pcdev
->sg_tail
[i
] = NULL
;
707 pcdev
->active
= list_entry(pcdev
->capture
.next
,
708 struct pxa_buffer
, vb
.queue
);
712 * pxa_camera_check_link_miss - check missed DMA linking
713 * @pcdev: camera device
715 * The DMA chaining is done with DMA running. This means a tiny temporal window
716 * remains, where a buffer is queued on the chain, while the chain is already
717 * stopped. This means the tailed buffer would never be transferred by DMA.
718 * This function restarts the capture for this corner case, where :
719 * - DADR() == DADDR_STOP
720 * - a videobuffer is queued on the pcdev->capture list
722 * Please check the "DMA hot chaining timeslice issue" in
723 * Documentation/video4linux/pxa_camera.txt
725 * Context: should only be called within the dma irq handler
727 static void pxa_camera_check_link_miss(struct pxa_camera_dev
*pcdev
)
729 int i
, is_dma_stopped
= 1;
731 for (i
= 0; i
< pcdev
->channels
; i
++)
732 if (DDADR(pcdev
->dma_chans
[i
]) != DDADR_STOP
)
734 dev_dbg(pcdev
->soc_host
.v4l2_dev
.dev
,
735 "%s : top queued buffer=%p, dma_stopped=%d\n",
736 __func__
, pcdev
->active
, is_dma_stopped
);
737 if (pcdev
->active
&& is_dma_stopped
)
738 pxa_camera_start_capture(pcdev
);
741 static void pxa_camera_dma_irq(int channel
, struct pxa_camera_dev
*pcdev
,
742 enum pxa_camera_active_dma act_dma
)
744 struct device
*dev
= pcdev
->soc_host
.v4l2_dev
.dev
;
745 struct pxa_buffer
*buf
;
747 u32 status
, camera_status
, overrun
;
748 struct videobuf_buffer
*vb
;
750 spin_lock_irqsave(&pcdev
->lock
, flags
);
752 status
= DCSR(channel
);
753 DCSR(channel
) = status
;
755 camera_status
= __raw_readl(pcdev
->base
+ CISR
);
756 overrun
= CISR_IFO_0
;
757 if (pcdev
->channels
== 3)
758 overrun
|= CISR_IFO_1
| CISR_IFO_2
;
760 if (status
& DCSR_BUSERR
) {
761 dev_err(dev
, "DMA Bus Error IRQ!\n");
765 if (!(status
& (DCSR_ENDINTR
| DCSR_STARTINTR
))) {
766 dev_err(dev
, "Unknown DMA IRQ source, status: 0x%08x\n",
772 * pcdev->active should not be NULL in DMA irq handler.
774 * But there is one corner case : if capture was stopped due to an
775 * overrun of channel 1, and at that same channel 2 was completed.
777 * When handling the overrun in DMA irq for channel 1, we'll stop the
778 * capture and restart it (and thus set pcdev->active to NULL). But the
779 * DMA irq handler will already be pending for channel 2. So on entering
780 * the DMA irq handler for channel 2 there will be no active buffer, yet
786 vb
= &pcdev
->active
->vb
;
787 buf
= container_of(vb
, struct pxa_buffer
, vb
);
788 WARN_ON(buf
->inwork
|| list_empty(&vb
->queue
));
790 dev_dbg(dev
, "%s channel=%d %s%s(vb=0x%p) dma.desc=%x\n",
791 __func__
, channel
, status
& DCSR_STARTINTR
? "SOF " : "",
792 status
& DCSR_ENDINTR
? "EOF " : "", vb
, DDADR(channel
));
794 if (status
& DCSR_ENDINTR
) {
796 * It's normal if the last frame creates an overrun, as there
797 * are no more DMA descriptors to fetch from QCI fifos
799 if (camera_status
& overrun
&&
800 !list_is_last(pcdev
->capture
.next
, &pcdev
->capture
)) {
801 dev_dbg(dev
, "FIFO overrun! CISR: %x\n",
803 pxa_camera_stop_capture(pcdev
);
804 pxa_camera_start_capture(pcdev
);
807 buf
->active_dma
&= ~act_dma
;
808 if (!buf
->active_dma
) {
809 pxa_camera_wakeup(pcdev
, vb
, buf
);
810 pxa_camera_check_link_miss(pcdev
);
815 spin_unlock_irqrestore(&pcdev
->lock
, flags
);
818 static void pxa_camera_dma_irq_y(int channel
, void *data
)
820 struct pxa_camera_dev
*pcdev
= data
;
821 pxa_camera_dma_irq(channel
, pcdev
, DMA_Y
);
824 static void pxa_camera_dma_irq_u(int channel
, void *data
)
826 struct pxa_camera_dev
*pcdev
= data
;
827 pxa_camera_dma_irq(channel
, pcdev
, DMA_U
);
830 static void pxa_camera_dma_irq_v(int channel
, void *data
)
832 struct pxa_camera_dev
*pcdev
= data
;
833 pxa_camera_dma_irq(channel
, pcdev
, DMA_V
);
836 static struct videobuf_queue_ops pxa_videobuf_ops
= {
837 .buf_setup
= pxa_videobuf_setup
,
838 .buf_prepare
= pxa_videobuf_prepare
,
839 .buf_queue
= pxa_videobuf_queue
,
840 .buf_release
= pxa_videobuf_release
,
843 static void pxa_camera_init_videobuf(struct videobuf_queue
*q
,
844 struct soc_camera_device
*icd
)
846 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->parent
);
847 struct pxa_camera_dev
*pcdev
= ici
->priv
;
850 * We must pass NULL as dev pointer, then all pci_* dma operations
851 * transform to normal dma_* ones.
853 videobuf_queue_sg_init(q
, &pxa_videobuf_ops
, NULL
, &pcdev
->lock
,
854 V4L2_BUF_TYPE_VIDEO_CAPTURE
, V4L2_FIELD_NONE
,
855 sizeof(struct pxa_buffer
), icd
, &icd
->video_lock
);
858 static u32
mclk_get_divisor(struct platform_device
*pdev
,
859 struct pxa_camera_dev
*pcdev
)
861 unsigned long mclk
= pcdev
->mclk
;
862 struct device
*dev
= &pdev
->dev
;
864 unsigned long lcdclk
;
866 lcdclk
= clk_get_rate(pcdev
->clk
);
867 pcdev
->ciclk
= lcdclk
;
869 /* mclk <= ciclk / 4 (27.4.2) */
870 if (mclk
> lcdclk
/ 4) {
872 dev_warn(dev
, "Limiting master clock to %lu\n", mclk
);
875 /* We verify mclk != 0, so if anyone breaks it, here comes their Oops */
876 div
= (lcdclk
+ 2 * mclk
- 1) / (2 * mclk
) - 1;
878 /* If we're not supplying MCLK, leave it at 0 */
879 if (pcdev
->platform_flags
& PXA_CAMERA_MCLK_EN
)
880 pcdev
->mclk
= lcdclk
/ (2 * (div
+ 1));
882 dev_dbg(dev
, "LCD clock %luHz, target freq %luHz, divisor %u\n",
888 static void recalculate_fifo_timeout(struct pxa_camera_dev
*pcdev
,
891 /* We want a timeout > 1 pixel time, not ">=" */
892 u32 ciclk_per_pixel
= pcdev
->ciclk
/ pclk
+ 1;
894 __raw_writel(ciclk_per_pixel
, pcdev
->base
+ CITOR
);
897 static void pxa_camera_activate(struct pxa_camera_dev
*pcdev
)
901 /* disable all interrupts */
902 __raw_writel(0x3ff, pcdev
->base
+ CICR0
);
904 if (pcdev
->platform_flags
& PXA_CAMERA_PCLK_EN
)
905 cicr4
|= CICR4_PCLK_EN
;
906 if (pcdev
->platform_flags
& PXA_CAMERA_MCLK_EN
)
907 cicr4
|= CICR4_MCLK_EN
;
908 if (pcdev
->platform_flags
& PXA_CAMERA_PCP
)
910 if (pcdev
->platform_flags
& PXA_CAMERA_HSP
)
912 if (pcdev
->platform_flags
& PXA_CAMERA_VSP
)
915 __raw_writel(pcdev
->mclk_divisor
| cicr4
, pcdev
->base
+ CICR4
);
917 if (pcdev
->platform_flags
& PXA_CAMERA_MCLK_EN
)
918 /* Initialise the timeout under the assumption pclk = mclk */
919 recalculate_fifo_timeout(pcdev
, pcdev
->mclk
);
921 /* "Safe default" - 13MHz */
922 recalculate_fifo_timeout(pcdev
, 13000000);
924 clk_enable(pcdev
->clk
);
927 static void pxa_camera_deactivate(struct pxa_camera_dev
*pcdev
)
929 clk_disable(pcdev
->clk
);
932 static irqreturn_t
pxa_camera_irq(int irq
, void *data
)
934 struct pxa_camera_dev
*pcdev
= data
;
935 unsigned long status
, cifr
, cicr0
;
936 struct pxa_buffer
*buf
;
937 struct videobuf_buffer
*vb
;
939 status
= __raw_readl(pcdev
->base
+ CISR
);
940 dev_dbg(pcdev
->soc_host
.v4l2_dev
.dev
,
941 "Camera interrupt status 0x%lx\n", status
);
946 __raw_writel(status
, pcdev
->base
+ CISR
);
948 if (status
& CISR_EOF
) {
949 /* Reset the FIFOs */
950 cifr
= __raw_readl(pcdev
->base
+ CIFR
) | CIFR_RESET_F
;
951 __raw_writel(cifr
, pcdev
->base
+ CIFR
);
953 pcdev
->active
= list_first_entry(&pcdev
->capture
,
954 struct pxa_buffer
, vb
.queue
);
955 vb
= &pcdev
->active
->vb
;
956 buf
= container_of(vb
, struct pxa_buffer
, vb
);
957 pxa_videobuf_set_actdma(pcdev
, buf
);
959 pxa_dma_start_channels(pcdev
);
961 cicr0
= __raw_readl(pcdev
->base
+ CICR0
) | CICR0_EOFM
;
962 __raw_writel(cicr0
, pcdev
->base
+ CICR0
);
969 * The following two functions absolutely depend on the fact, that
970 * there can be only one camera on PXA quick capture interface
971 * Called with .video_lock held
973 static int pxa_camera_add_device(struct soc_camera_device
*icd
)
975 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->parent
);
976 struct pxa_camera_dev
*pcdev
= ici
->priv
;
981 pxa_camera_activate(pcdev
);
985 dev_info(icd
->parent
, "PXA Camera driver attached to camera %d\n",
991 /* Called with .video_lock held */
992 static void pxa_camera_remove_device(struct soc_camera_device
*icd
)
994 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->parent
);
995 struct pxa_camera_dev
*pcdev
= ici
->priv
;
997 BUG_ON(icd
!= pcdev
->icd
);
999 dev_info(icd
->parent
, "PXA Camera driver detached from camera %d\n",
1002 /* disable capture, disable interrupts */
1003 __raw_writel(0x3ff, pcdev
->base
+ CICR0
);
1005 /* Stop DMA engine */
1006 DCSR(pcdev
->dma_chans
[0]) = 0;
1007 DCSR(pcdev
->dma_chans
[1]) = 0;
1008 DCSR(pcdev
->dma_chans
[2]) = 0;
1010 pxa_camera_deactivate(pcdev
);
1015 static int test_platform_param(struct pxa_camera_dev
*pcdev
,
1016 unsigned char buswidth
, unsigned long *flags
)
1019 * Platform specified synchronization and pixel clock polarities are
1020 * only a recommendation and are only used during probing. The PXA270
1021 * quick capture interface supports both.
1023 *flags
= (pcdev
->platform_flags
& PXA_CAMERA_MASTER
?
1024 V4L2_MBUS_MASTER
: V4L2_MBUS_SLAVE
) |
1025 V4L2_MBUS_HSYNC_ACTIVE_HIGH
|
1026 V4L2_MBUS_HSYNC_ACTIVE_LOW
|
1027 V4L2_MBUS_VSYNC_ACTIVE_HIGH
|
1028 V4L2_MBUS_VSYNC_ACTIVE_LOW
|
1029 V4L2_MBUS_DATA_ACTIVE_HIGH
|
1030 V4L2_MBUS_PCLK_SAMPLE_RISING
|
1031 V4L2_MBUS_PCLK_SAMPLE_FALLING
;
1033 /* If requested data width is supported by the platform, use it */
1034 if ((1 << (buswidth
- 1)) & pcdev
->width_flags
)
1040 static void pxa_camera_setup_cicr(struct soc_camera_device
*icd
,
1041 unsigned long flags
, __u32 pixfmt
)
1043 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->parent
);
1044 struct pxa_camera_dev
*pcdev
= ici
->priv
;
1045 struct v4l2_subdev
*sd
= soc_camera_to_subdev(icd
);
1046 unsigned long dw
, bpp
;
1047 u32 cicr0
, cicr1
, cicr2
, cicr3
, cicr4
= 0, y_skip_top
;
1048 int ret
= v4l2_subdev_call(sd
, sensor
, g_skip_top_lines
, &y_skip_top
);
1054 * Datawidth is now guaranteed to be equal to one of the three values.
1055 * We fix bit-per-pixel equal to data-width...
1057 switch (icd
->current_fmt
->host_fmt
->bits_per_sample
) {
1068 * Actually it can only be 8 now,
1069 * default is just to silence compiler warnings
1076 if (pcdev
->platform_flags
& PXA_CAMERA_PCLK_EN
)
1077 cicr4
|= CICR4_PCLK_EN
;
1078 if (pcdev
->platform_flags
& PXA_CAMERA_MCLK_EN
)
1079 cicr4
|= CICR4_MCLK_EN
;
1080 if (flags
& V4L2_MBUS_PCLK_SAMPLE_FALLING
)
1082 if (flags
& V4L2_MBUS_HSYNC_ACTIVE_LOW
)
1084 if (flags
& V4L2_MBUS_VSYNC_ACTIVE_LOW
)
1087 cicr0
= __raw_readl(pcdev
->base
+ CICR0
);
1088 if (cicr0
& CICR0_ENB
)
1089 __raw_writel(cicr0
& ~CICR0_ENB
, pcdev
->base
+ CICR0
);
1091 cicr1
= CICR1_PPL_VAL(icd
->user_width
- 1) | bpp
| dw
;
1094 case V4L2_PIX_FMT_YUV422P
:
1095 pcdev
->channels
= 3;
1096 cicr1
|= CICR1_YCBCR_F
;
1098 * Normally, pxa bus wants as input UYVY format. We allow all
1099 * reorderings of the YUV422 format, as no processing is done,
1100 * and the YUV stream is just passed through without any
1101 * transformation. Note that UYVY is the only format that
1102 * should be used if pxa framebuffer Overlay2 is used.
1104 case V4L2_PIX_FMT_UYVY
:
1105 case V4L2_PIX_FMT_VYUY
:
1106 case V4L2_PIX_FMT_YUYV
:
1107 case V4L2_PIX_FMT_YVYU
:
1108 cicr1
|= CICR1_COLOR_SP_VAL(2);
1110 case V4L2_PIX_FMT_RGB555
:
1111 cicr1
|= CICR1_RGB_BPP_VAL(1) | CICR1_RGBT_CONV_VAL(2) |
1112 CICR1_TBIT
| CICR1_COLOR_SP_VAL(1);
1114 case V4L2_PIX_FMT_RGB565
:
1115 cicr1
|= CICR1_COLOR_SP_VAL(1) | CICR1_RGB_BPP_VAL(2);
1120 cicr3
= CICR3_LPF_VAL(icd
->user_height
- 1) |
1121 CICR3_BFW_VAL(min((u32
)255, y_skip_top
));
1122 cicr4
|= pcdev
->mclk_divisor
;
1124 __raw_writel(cicr1
, pcdev
->base
+ CICR1
);
1125 __raw_writel(cicr2
, pcdev
->base
+ CICR2
);
1126 __raw_writel(cicr3
, pcdev
->base
+ CICR3
);
1127 __raw_writel(cicr4
, pcdev
->base
+ CICR4
);
1129 /* CIF interrupts are not used, only DMA */
1130 cicr0
= (cicr0
& CICR0_ENB
) | (pcdev
->platform_flags
& PXA_CAMERA_MASTER
?
1131 CICR0_SIM_MP
: (CICR0_SL_CAP_EN
| CICR0_SIM_SP
));
1132 cicr0
|= CICR0_DMAEN
| CICR0_IRQ_MASK
;
1133 __raw_writel(cicr0
, pcdev
->base
+ CICR0
);
1136 static int pxa_camera_set_bus_param(struct soc_camera_device
*icd
)
1138 struct v4l2_subdev
*sd
= soc_camera_to_subdev(icd
);
1139 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->parent
);
1140 struct pxa_camera_dev
*pcdev
= ici
->priv
;
1141 struct v4l2_mbus_config cfg
= {.type
= V4L2_MBUS_PARALLEL
,};
1142 u32 pixfmt
= icd
->current_fmt
->host_fmt
->fourcc
;
1143 unsigned long bus_flags
, common_flags
;
1145 struct pxa_cam
*cam
= icd
->host_priv
;
1147 ret
= test_platform_param(pcdev
, icd
->current_fmt
->host_fmt
->bits_per_sample
,
1152 ret
= v4l2_subdev_call(sd
, video
, g_mbus_config
, &cfg
);
1154 common_flags
= soc_mbus_config_compatible(&cfg
,
1156 if (!common_flags
) {
1157 dev_warn(icd
->parent
,
1158 "Flags incompatible: camera 0x%x, host 0x%lx\n",
1159 cfg
.flags
, bus_flags
);
1162 } else if (ret
!= -ENOIOCTLCMD
) {
1165 common_flags
= bus_flags
;
1168 pcdev
->channels
= 1;
1170 /* Make choises, based on platform preferences */
1171 if ((common_flags
& V4L2_MBUS_HSYNC_ACTIVE_HIGH
) &&
1172 (common_flags
& V4L2_MBUS_HSYNC_ACTIVE_LOW
)) {
1173 if (pcdev
->platform_flags
& PXA_CAMERA_HSP
)
1174 common_flags
&= ~V4L2_MBUS_HSYNC_ACTIVE_HIGH
;
1176 common_flags
&= ~V4L2_MBUS_HSYNC_ACTIVE_LOW
;
1179 if ((common_flags
& V4L2_MBUS_VSYNC_ACTIVE_HIGH
) &&
1180 (common_flags
& V4L2_MBUS_VSYNC_ACTIVE_LOW
)) {
1181 if (pcdev
->platform_flags
& PXA_CAMERA_VSP
)
1182 common_flags
&= ~V4L2_MBUS_VSYNC_ACTIVE_HIGH
;
1184 common_flags
&= ~V4L2_MBUS_VSYNC_ACTIVE_LOW
;
1187 if ((common_flags
& V4L2_MBUS_PCLK_SAMPLE_RISING
) &&
1188 (common_flags
& V4L2_MBUS_PCLK_SAMPLE_FALLING
)) {
1189 if (pcdev
->platform_flags
& PXA_CAMERA_PCP
)
1190 common_flags
&= ~V4L2_MBUS_PCLK_SAMPLE_RISING
;
1192 common_flags
&= ~V4L2_MBUS_PCLK_SAMPLE_FALLING
;
1195 cfg
.flags
= common_flags
;
1196 ret
= v4l2_subdev_call(sd
, video
, s_mbus_config
, &cfg
);
1197 if (ret
< 0 && ret
!= -ENOIOCTLCMD
) {
1198 dev_dbg(icd
->parent
, "camera s_mbus_config(0x%lx) returned %d\n",
1203 cam
->flags
= common_flags
;
1205 pxa_camera_setup_cicr(icd
, common_flags
, pixfmt
);
1210 static int pxa_camera_try_bus_param(struct soc_camera_device
*icd
,
1211 unsigned char buswidth
)
1213 struct v4l2_subdev
*sd
= soc_camera_to_subdev(icd
);
1214 struct soc_camera_host
*ici
= to_soc_camera_host(icd
->parent
);
1215 struct pxa_camera_dev
*pcdev
= ici
->priv
;
1216 struct v4l2_mbus_config cfg
= {.type
= V4L2_MBUS_PARALLEL
,};
1217 unsigned long bus_flags
, common_flags
;
1218 int ret
= test_platform_param(pcdev
, buswidth
, &bus_flags
);
1223 ret
= v4l2_subdev_call(sd
, video
, g_mbus_config
, &cfg
);
1225 common_flags
= soc_mbus_config_compatible(&cfg
,
1227 if (!common_flags
) {
1228 dev_warn(icd
->parent
,
1229 "Flags incompatible: camera 0x%x, host 0x%lx\n",
1230 cfg
.flags
, bus_flags
);
1233 } else if (ret
== -ENOIOCTLCMD
) {
1240 static const struct soc_mbus_pixelfmt pxa_camera_formats
[] = {
1242 .fourcc
= V4L2_PIX_FMT_YUV422P
,
1243 .name
= "Planar YUV422 16 bit",
1244 .bits_per_sample
= 8,
1245 .packing
= SOC_MBUS_PACKING_2X8_PADHI
,
1246 .order
= SOC_MBUS_ORDER_LE
,
1250 /* This will be corrected as we get more formats */
1251 static bool pxa_camera_packing_supported(const struct soc_mbus_pixelfmt
*fmt
)
1253 return fmt
->packing
== SOC_MBUS_PACKING_NONE
||
1254 (fmt
->bits_per_sample
== 8 &&
1255 fmt
->packing
== SOC_MBUS_PACKING_2X8_PADHI
) ||
1256 (fmt
->bits_per_sample
> 8 &&
1257 fmt
->packing
== SOC_MBUS_PACKING_EXTEND16
);
1260 static int pxa_camera_get_formats(struct soc_camera_device
*icd
, unsigned int idx
,
1261 struct soc_camera_format_xlate
*xlate
)
1263 struct v4l2_subdev
*sd
= soc_camera_to_subdev(icd
);
1264 struct device
*dev
= icd
->parent
;
1265 int formats
= 0, ret
;
1266 struct pxa_cam
*cam
;
1267 enum v4l2_mbus_pixelcode code
;
1268 const struct soc_mbus_pixelfmt
*fmt
;
1270 ret
= v4l2_subdev_call(sd
, video
, enum_mbus_fmt
, idx
, &code
);
1272 /* No more formats */
1275 fmt
= soc_mbus_get_fmtdesc(code
);
1277 dev_err(dev
, "Invalid format code #%u: %d\n", idx
, code
);
1281 /* This also checks support for the requested bits-per-sample */
1282 ret
= pxa_camera_try_bus_param(icd
, fmt
->bits_per_sample
);
1286 if (!icd
->host_priv
) {
1287 cam
= kzalloc(sizeof(*cam
), GFP_KERNEL
);
1291 icd
->host_priv
= cam
;
1293 cam
= icd
->host_priv
;
1297 case V4L2_MBUS_FMT_UYVY8_2X8
:
1300 xlate
->host_fmt
= &pxa_camera_formats
[0];
1303 dev_dbg(dev
, "Providing format %s using code %d\n",
1304 pxa_camera_formats
[0].name
, code
);
1306 case V4L2_MBUS_FMT_VYUY8_2X8
:
1307 case V4L2_MBUS_FMT_YUYV8_2X8
:
1308 case V4L2_MBUS_FMT_YVYU8_2X8
:
1309 case V4L2_MBUS_FMT_RGB565_2X8_LE
:
1310 case V4L2_MBUS_FMT_RGB555_2X8_PADHI_LE
:
1312 dev_dbg(dev
, "Providing format %s packed\n",
1316 if (!pxa_camera_packing_supported(fmt
))
1320 "Providing format %s in pass-through mode\n",
1324 /* Generic pass-through */
1327 xlate
->host_fmt
= fmt
;
1335 static void pxa_camera_put_formats(struct soc_camera_device
*icd
)
1337 kfree(icd
->host_priv
);
1338 icd
->host_priv
= NULL
;
1341 static int pxa_camera_check_frame(u32 width
, u32 height
)
1343 /* limit to pxa hardware capabilities */
1344 return height
< 32 || height
> 2048 || width
< 48 || width
> 2048 ||
1348 static int pxa_camera_set_crop(struct soc_camera_device
*icd
,
1349 struct v4l2_crop
*a
)
1351 struct v4l2_rect
*rect
= &a
->c
;
1352 struct device
*dev
= icd
->parent
;
1353 struct soc_camera_host
*ici
= to_soc_camera_host(dev
);
1354 struct pxa_camera_dev
*pcdev
= ici
->priv
;
1355 struct v4l2_subdev
*sd
= soc_camera_to_subdev(icd
);
1356 struct soc_camera_sense sense
= {
1357 .master_clock
= pcdev
->mclk
,
1358 .pixel_clock_max
= pcdev
->ciclk
/ 4,
1360 struct v4l2_mbus_framefmt mf
;
1361 struct pxa_cam
*cam
= icd
->host_priv
;
1362 u32 fourcc
= icd
->current_fmt
->host_fmt
->fourcc
;
1365 /* If PCLK is used to latch data from the sensor, check sense */
1366 if (pcdev
->platform_flags
& PXA_CAMERA_PCLK_EN
)
1367 icd
->sense
= &sense
;
1369 ret
= v4l2_subdev_call(sd
, video
, s_crop
, a
);
1374 dev_warn(dev
, "Failed to crop to %ux%u@%u:%u\n",
1375 rect
->width
, rect
->height
, rect
->left
, rect
->top
);
1379 ret
= v4l2_subdev_call(sd
, video
, g_mbus_fmt
, &mf
);
1383 if (pxa_camera_check_frame(mf
.width
, mf
.height
)) {
1385 * Camera cropping produced a frame beyond our capabilities.
1386 * FIXME: just extract a subframe, that we can process.
1388 v4l_bound_align_image(&mf
.width
, 48, 2048, 1,
1389 &mf
.height
, 32, 2048, 0,
1390 fourcc
== V4L2_PIX_FMT_YUV422P
? 4 : 0);
1391 ret
= v4l2_subdev_call(sd
, video
, s_mbus_fmt
, &mf
);
1395 if (pxa_camera_check_frame(mf
.width
, mf
.height
)) {
1396 dev_warn(icd
->parent
,
1397 "Inconsistent state. Use S_FMT to repair\n");
1402 if (sense
.flags
& SOCAM_SENSE_PCLK_CHANGED
) {
1403 if (sense
.pixel_clock
> sense
.pixel_clock_max
) {
1405 "pixel clock %lu set by the camera too high!",
1409 recalculate_fifo_timeout(pcdev
, sense
.pixel_clock
);
1412 icd
->user_width
= mf
.width
;
1413 icd
->user_height
= mf
.height
;
1415 pxa_camera_setup_cicr(icd
, cam
->flags
, fourcc
);
1420 static int pxa_camera_set_fmt(struct soc_camera_device
*icd
,
1421 struct v4l2_format
*f
)
1423 struct device
*dev
= icd
->parent
;
1424 struct soc_camera_host
*ici
= to_soc_camera_host(dev
);
1425 struct pxa_camera_dev
*pcdev
= ici
->priv
;
1426 struct v4l2_subdev
*sd
= soc_camera_to_subdev(icd
);
1427 const struct soc_camera_format_xlate
*xlate
= NULL
;
1428 struct soc_camera_sense sense
= {
1429 .master_clock
= pcdev
->mclk
,
1430 .pixel_clock_max
= pcdev
->ciclk
/ 4,
1432 struct v4l2_pix_format
*pix
= &f
->fmt
.pix
;
1433 struct v4l2_mbus_framefmt mf
;
1436 xlate
= soc_camera_xlate_by_fourcc(icd
, pix
->pixelformat
);
1438 dev_warn(dev
, "Format %x not found\n", pix
->pixelformat
);
1442 /* If PCLK is used to latch data from the sensor, check sense */
1443 if (pcdev
->platform_flags
& PXA_CAMERA_PCLK_EN
)
1444 /* The caller holds a mutex. */
1445 icd
->sense
= &sense
;
1447 mf
.width
= pix
->width
;
1448 mf
.height
= pix
->height
;
1449 mf
.field
= pix
->field
;
1450 mf
.colorspace
= pix
->colorspace
;
1451 mf
.code
= xlate
->code
;
1453 ret
= v4l2_subdev_call(sd
, video
, s_mbus_fmt
, &mf
);
1455 if (mf
.code
!= xlate
->code
)
1461 dev_warn(dev
, "Failed to configure for format %x\n",
1463 } else if (pxa_camera_check_frame(mf
.width
, mf
.height
)) {
1465 "Camera driver produced an unsupported frame %dx%d\n",
1466 mf
.width
, mf
.height
);
1468 } else if (sense
.flags
& SOCAM_SENSE_PCLK_CHANGED
) {
1469 if (sense
.pixel_clock
> sense
.pixel_clock_max
) {
1471 "pixel clock %lu set by the camera too high!",
1475 recalculate_fifo_timeout(pcdev
, sense
.pixel_clock
);
1481 pix
->width
= mf
.width
;
1482 pix
->height
= mf
.height
;
1483 pix
->field
= mf
.field
;
1484 pix
->colorspace
= mf
.colorspace
;
1485 icd
->current_fmt
= xlate
;
1490 static int pxa_camera_try_fmt(struct soc_camera_device
*icd
,
1491 struct v4l2_format
*f
)
1493 struct v4l2_subdev
*sd
= soc_camera_to_subdev(icd
);
1494 const struct soc_camera_format_xlate
*xlate
;
1495 struct v4l2_pix_format
*pix
= &f
->fmt
.pix
;
1496 struct v4l2_mbus_framefmt mf
;
1497 __u32 pixfmt
= pix
->pixelformat
;
1500 xlate
= soc_camera_xlate_by_fourcc(icd
, pixfmt
);
1502 dev_warn(icd
->parent
, "Format %x not found\n", pixfmt
);
1507 * Limit to pxa hardware capabilities. YUV422P planar format requires
1508 * images size to be a multiple of 16 bytes. If not, zeros will be
1509 * inserted between Y and U planes, and U and V planes, which violates
1510 * the YUV422P standard.
1512 v4l_bound_align_image(&pix
->width
, 48, 2048, 1,
1513 &pix
->height
, 32, 2048, 0,
1514 pixfmt
== V4L2_PIX_FMT_YUV422P
? 4 : 0);
1516 /* limit to sensor capabilities */
1517 mf
.width
= pix
->width
;
1518 mf
.height
= pix
->height
;
1519 /* Only progressive video supported so far */
1520 mf
.field
= V4L2_FIELD_NONE
;
1521 mf
.colorspace
= pix
->colorspace
;
1522 mf
.code
= xlate
->code
;
1524 ret
= v4l2_subdev_call(sd
, video
, try_mbus_fmt
, &mf
);
1528 pix
->width
= mf
.width
;
1529 pix
->height
= mf
.height
;
1530 pix
->colorspace
= mf
.colorspace
;
1533 case V4L2_FIELD_ANY
:
1534 case V4L2_FIELD_NONE
:
1535 pix
->field
= V4L2_FIELD_NONE
;
1538 /* TODO: support interlaced at least in pass-through mode */
1539 dev_err(icd
->parent
, "Field type %d unsupported.\n",
1547 static int pxa_camera_reqbufs(struct soc_camera_device
*icd
,
1548 struct v4l2_requestbuffers
*p
)
1553 * This is for locking debugging only. I removed spinlocks and now I
1554 * check whether .prepare is ever called on a linked buffer, or whether
1555 * a dma IRQ can occur for an in-work or unlinked buffer. Until now
1556 * it hadn't triggered
1558 for (i
= 0; i
< p
->count
; i
++) {
1559 struct pxa_buffer
*buf
= container_of(icd
->vb_vidq
.bufs
[i
],
1560 struct pxa_buffer
, vb
);
1562 INIT_LIST_HEAD(&buf
->vb
.queue
);
1568 static unsigned int pxa_camera_poll(struct file
*file
, poll_table
*pt
)
1570 struct soc_camera_device
*icd
= file
->private_data
;
1571 struct pxa_buffer
*buf
;
1573 buf
= list_entry(icd
->vb_vidq
.stream
.next
, struct pxa_buffer
,
1576 poll_wait(file
, &buf
->vb
.done
, pt
);
1578 if (buf
->vb
.state
== VIDEOBUF_DONE
||
1579 buf
->vb
.state
== VIDEOBUF_ERROR
)
1580 return POLLIN
|POLLRDNORM
;
1585 static int pxa_camera_querycap(struct soc_camera_host
*ici
,
1586 struct v4l2_capability
*cap
)
1588 /* cap->name is set by the firendly caller:-> */
1589 strlcpy(cap
->card
, pxa_cam_driver_description
, sizeof(cap
->card
));
1590 cap
->capabilities
= V4L2_CAP_VIDEO_CAPTURE
| V4L2_CAP_STREAMING
;
1595 static int pxa_camera_suspend(struct device
*dev
)
1597 struct soc_camera_host
*ici
= to_soc_camera_host(dev
);
1598 struct pxa_camera_dev
*pcdev
= ici
->priv
;
1601 pcdev
->save_cicr
[i
++] = __raw_readl(pcdev
->base
+ CICR0
);
1602 pcdev
->save_cicr
[i
++] = __raw_readl(pcdev
->base
+ CICR1
);
1603 pcdev
->save_cicr
[i
++] = __raw_readl(pcdev
->base
+ CICR2
);
1604 pcdev
->save_cicr
[i
++] = __raw_readl(pcdev
->base
+ CICR3
);
1605 pcdev
->save_cicr
[i
++] = __raw_readl(pcdev
->base
+ CICR4
);
1608 struct v4l2_subdev
*sd
= soc_camera_to_subdev(pcdev
->icd
);
1609 ret
= v4l2_subdev_call(sd
, core
, s_power
, 0);
1610 if (ret
== -ENOIOCTLCMD
)
1617 static int pxa_camera_resume(struct device
*dev
)
1619 struct soc_camera_host
*ici
= to_soc_camera_host(dev
);
1620 struct pxa_camera_dev
*pcdev
= ici
->priv
;
1623 DRCMR(68) = pcdev
->dma_chans
[0] | DRCMR_MAPVLD
;
1624 DRCMR(69) = pcdev
->dma_chans
[1] | DRCMR_MAPVLD
;
1625 DRCMR(70) = pcdev
->dma_chans
[2] | DRCMR_MAPVLD
;
1627 __raw_writel(pcdev
->save_cicr
[i
++] & ~CICR0_ENB
, pcdev
->base
+ CICR0
);
1628 __raw_writel(pcdev
->save_cicr
[i
++], pcdev
->base
+ CICR1
);
1629 __raw_writel(pcdev
->save_cicr
[i
++], pcdev
->base
+ CICR2
);
1630 __raw_writel(pcdev
->save_cicr
[i
++], pcdev
->base
+ CICR3
);
1631 __raw_writel(pcdev
->save_cicr
[i
++], pcdev
->base
+ CICR4
);
1634 struct v4l2_subdev
*sd
= soc_camera_to_subdev(pcdev
->icd
);
1635 ret
= v4l2_subdev_call(sd
, core
, s_power
, 1);
1636 if (ret
== -ENOIOCTLCMD
)
1640 /* Restart frame capture if active buffer exists */
1641 if (!ret
&& pcdev
->active
)
1642 pxa_camera_start_capture(pcdev
);
1647 static struct soc_camera_host_ops pxa_soc_camera_host_ops
= {
1648 .owner
= THIS_MODULE
,
1649 .add
= pxa_camera_add_device
,
1650 .remove
= pxa_camera_remove_device
,
1651 .set_crop
= pxa_camera_set_crop
,
1652 .get_formats
= pxa_camera_get_formats
,
1653 .put_formats
= pxa_camera_put_formats
,
1654 .set_fmt
= pxa_camera_set_fmt
,
1655 .try_fmt
= pxa_camera_try_fmt
,
1656 .init_videobuf
= pxa_camera_init_videobuf
,
1657 .reqbufs
= pxa_camera_reqbufs
,
1658 .poll
= pxa_camera_poll
,
1659 .querycap
= pxa_camera_querycap
,
1660 .set_bus_param
= pxa_camera_set_bus_param
,
1663 static int __devinit
pxa_camera_probe(struct platform_device
*pdev
)
1665 struct pxa_camera_dev
*pcdev
;
1666 struct resource
*res
;
1671 res
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
1672 irq
= platform_get_irq(pdev
, 0);
1673 if (!res
|| irq
< 0) {
1678 pcdev
= kzalloc(sizeof(*pcdev
), GFP_KERNEL
);
1680 dev_err(&pdev
->dev
, "Could not allocate pcdev\n");
1685 pcdev
->clk
= clk_get(&pdev
->dev
, NULL
);
1686 if (IS_ERR(pcdev
->clk
)) {
1687 err
= PTR_ERR(pcdev
->clk
);
1693 pcdev
->pdata
= pdev
->dev
.platform_data
;
1694 pcdev
->platform_flags
= pcdev
->pdata
->flags
;
1695 if (!(pcdev
->platform_flags
& (PXA_CAMERA_DATAWIDTH_8
|
1696 PXA_CAMERA_DATAWIDTH_9
| PXA_CAMERA_DATAWIDTH_10
))) {
1698 * Platform hasn't set available data widths. This is bad.
1699 * Warn and use a default.
1701 dev_warn(&pdev
->dev
, "WARNING! Platform hasn't set available "
1702 "data widths, using default 10 bit\n");
1703 pcdev
->platform_flags
|= PXA_CAMERA_DATAWIDTH_10
;
1705 if (pcdev
->platform_flags
& PXA_CAMERA_DATAWIDTH_8
)
1706 pcdev
->width_flags
= 1 << 7;
1707 if (pcdev
->platform_flags
& PXA_CAMERA_DATAWIDTH_9
)
1708 pcdev
->width_flags
|= 1 << 8;
1709 if (pcdev
->platform_flags
& PXA_CAMERA_DATAWIDTH_10
)
1710 pcdev
->width_flags
|= 1 << 9;
1711 pcdev
->mclk
= pcdev
->pdata
->mclk_10khz
* 10000;
1713 dev_warn(&pdev
->dev
,
1714 "mclk == 0! Please, fix your platform data. "
1715 "Using default 20MHz\n");
1716 pcdev
->mclk
= 20000000;
1719 pcdev
->mclk_divisor
= mclk_get_divisor(pdev
, pcdev
);
1721 INIT_LIST_HEAD(&pcdev
->capture
);
1722 spin_lock_init(&pcdev
->lock
);
1725 * Request the regions.
1727 if (!request_mem_region(res
->start
, resource_size(res
),
1728 PXA_CAM_DRV_NAME
)) {
1733 base
= ioremap(res
->start
, resource_size(res
));
1742 err
= pxa_request_dma("CI_Y", DMA_PRIO_HIGH
,
1743 pxa_camera_dma_irq_y
, pcdev
);
1745 dev_err(&pdev
->dev
, "Can't request DMA for Y\n");
1748 pcdev
->dma_chans
[0] = err
;
1749 dev_dbg(&pdev
->dev
, "got DMA channel %d\n", pcdev
->dma_chans
[0]);
1751 err
= pxa_request_dma("CI_U", DMA_PRIO_HIGH
,
1752 pxa_camera_dma_irq_u
, pcdev
);
1754 dev_err(&pdev
->dev
, "Can't request DMA for U\n");
1755 goto exit_free_dma_y
;
1757 pcdev
->dma_chans
[1] = err
;
1758 dev_dbg(&pdev
->dev
, "got DMA channel (U) %d\n", pcdev
->dma_chans
[1]);
1760 err
= pxa_request_dma("CI_V", DMA_PRIO_HIGH
,
1761 pxa_camera_dma_irq_v
, pcdev
);
1763 dev_err(&pdev
->dev
, "Can't request DMA for V\n");
1764 goto exit_free_dma_u
;
1766 pcdev
->dma_chans
[2] = err
;
1767 dev_dbg(&pdev
->dev
, "got DMA channel (V) %d\n", pcdev
->dma_chans
[2]);
1769 DRCMR(68) = pcdev
->dma_chans
[0] | DRCMR_MAPVLD
;
1770 DRCMR(69) = pcdev
->dma_chans
[1] | DRCMR_MAPVLD
;
1771 DRCMR(70) = pcdev
->dma_chans
[2] | DRCMR_MAPVLD
;
1774 err
= request_irq(pcdev
->irq
, pxa_camera_irq
, 0, PXA_CAM_DRV_NAME
,
1777 dev_err(&pdev
->dev
, "Camera interrupt register failed \n");
1781 pcdev
->soc_host
.drv_name
= PXA_CAM_DRV_NAME
;
1782 pcdev
->soc_host
.ops
= &pxa_soc_camera_host_ops
;
1783 pcdev
->soc_host
.priv
= pcdev
;
1784 pcdev
->soc_host
.v4l2_dev
.dev
= &pdev
->dev
;
1785 pcdev
->soc_host
.nr
= pdev
->id
;
1787 err
= soc_camera_host_register(&pcdev
->soc_host
);
1794 free_irq(pcdev
->irq
, pcdev
);
1796 pxa_free_dma(pcdev
->dma_chans
[2]);
1798 pxa_free_dma(pcdev
->dma_chans
[1]);
1800 pxa_free_dma(pcdev
->dma_chans
[0]);
1804 release_mem_region(res
->start
, resource_size(res
));
1806 clk_put(pcdev
->clk
);
1813 static int __devexit
pxa_camera_remove(struct platform_device
*pdev
)
1815 struct soc_camera_host
*soc_host
= to_soc_camera_host(&pdev
->dev
);
1816 struct pxa_camera_dev
*pcdev
= container_of(soc_host
,
1817 struct pxa_camera_dev
, soc_host
);
1818 struct resource
*res
;
1820 clk_put(pcdev
->clk
);
1822 pxa_free_dma(pcdev
->dma_chans
[0]);
1823 pxa_free_dma(pcdev
->dma_chans
[1]);
1824 pxa_free_dma(pcdev
->dma_chans
[2]);
1825 free_irq(pcdev
->irq
, pcdev
);
1827 soc_camera_host_unregister(soc_host
);
1829 iounmap(pcdev
->base
);
1832 release_mem_region(res
->start
, resource_size(res
));
1836 dev_info(&pdev
->dev
, "PXA Camera driver unloaded\n");
1841 static struct dev_pm_ops pxa_camera_pm
= {
1842 .suspend
= pxa_camera_suspend
,
1843 .resume
= pxa_camera_resume
,
1846 static struct platform_driver pxa_camera_driver
= {
1848 .name
= PXA_CAM_DRV_NAME
,
1849 .pm
= &pxa_camera_pm
,
1851 .probe
= pxa_camera_probe
,
1852 .remove
= __devexit_p(pxa_camera_remove
),
1855 module_platform_driver(pxa_camera_driver
);
1857 MODULE_DESCRIPTION("PXA27x SoC Camera Host driver");
1858 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
1859 MODULE_LICENSE("GPL");
1860 MODULE_VERSION(PXA_CAM_VERSION
);
1861 MODULE_ALIAS("platform:" PXA_CAM_DRV_NAME
);