1 /*
2 * V4L2 Driver for PXA camera host
3 *
4 * Copyright (C) 2006, Sascha Hauer, Pengutronix
5 * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
6 *
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.
11 */
12
13 #include <linux/init.h>
14 #include <linux/module.h>
15 #include <linux/io.h>
16 #include <linux/delay.h>
17 #include <linux/dma-mapping.h>
18 #include <linux/err.h>
19 #include <linux/errno.h>
20 #include <linux/fs.h>
21 #include <linux/interrupt.h>
22 #include <linux/kernel.h>
23 #include <linux/mm.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>
31
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>
38
39 #include <linux/videodev2.h>
40
41 #include <mach/dma.h>
42 #include <linux/platform_data/camera-pxa.h>
43
44 #define PXA_CAM_VERSION "0.0.6"
45 #define PXA_CAM_DRV_NAME "pxa27x-camera"
46
47 /* Camera Interface */
48 #define CICR0 0x0000
49 #define CICR1 0x0004
50 #define CICR2 0x0008
51 #define CICR3 0x000C
52 #define CICR4 0x0010
53 #define CISR 0x0014
54 #define CIFR 0x0018
55 #define CITOR 0x001C
56 #define CIBR0 0x0028
57 #define CIBR1 0x0030
58 #define CIBR2 0x0038
59
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 */
76
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 */
87
88 #define CICR2_BLW (0xff << 24) /* Beginning-of-line pixel clock
89 wait count mask */
90 #define CICR2_ELW (0xff << 16) /* End-of-line pixel clock
91 wait count mask */
92 #define CICR2_HSW (0x3f << 10) /* Horizontal sync pulse width mask */
93 #define CICR2_BFPW (0x3f << 3) /* Beginning-of-frame pixel clock
94 wait count mask */
95 #define CICR2_FSW (0x7 << 0) /* Frame stabilization
96 wait count mask */
97
98 #define CICR3_BFW (0xff << 24) /* Beginning-of-frame line clock
99 wait count mask */
100 #define CICR3_EFW (0xff << 16) /* End-of-frame line clock
101 wait count mask */
102 #define CICR3_VSW (0x3f << 10) /* Vertical sync pulse width mask */
103 #define CICR3_BFPW (0x3f << 3) /* Beginning-of-frame pixel clock
104 wait count mask */
105 #define CICR3_LPF (0x7ff << 0) /* Lines per frame mask */
106
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 */
115
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 */
132
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 */
141
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)
147
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 */
153
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 */
159
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 */
164
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)
168
169 /*
170 * Structures
171 */
172 enum pxa_camera_active_dma {
173 DMA_Y = 0x1,
174 DMA_U = 0x2,
175 DMA_V = 0x4,
176 };
177
178 /* descriptor needed for the PXA DMA engine */
179 struct pxa_cam_dma {
180 dma_addr_t sg_dma;
181 struct pxa_dma_desc *sg_cpu;
182 size_t sg_size;
183 int sglen;
184 };
185
186 /* buffer for one video frame */
187 struct pxa_buffer {
188 /* common v4l buffer stuff -- must be first */
189 struct videobuf_buffer vb;
190 u32 code;
191 /* our descriptor lists for Y, U and V channels */
192 struct pxa_cam_dma dmas[3];
193 int inwork;
194 enum pxa_camera_active_dma active_dma;
195 };
196
197 struct pxa_camera_dev {
198 struct soc_camera_host soc_host;
199 /*
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
203 */
204 struct clk *clk;
205
206 unsigned int irq;
207 void __iomem *base;
208
209 int channels;
210 unsigned int dma_chans[3];
211
212 struct pxacamera_platform_data *pdata;
213 struct resource *res;
214 unsigned long platform_flags;
215 unsigned long ciclk;
216 unsigned long mclk;
217 u32 mclk_divisor;
218 u16 width_flags; /* max 10 bits */
219
220 struct list_head capture;
221
222 spinlock_t lock;
223
224 struct pxa_buffer *active;
225 struct pxa_dma_desc *sg_tail[3];
226
227 u32 save_cicr[5];
228 };
229
230 struct pxa_cam {
231 unsigned long flags;
232 };
233
234 static const char *pxa_cam_driver_description = "PXA_Camera";
235
236 static unsigned int vid_limit = 16; /* Video memory limit, in Mb */
237
238 /*
239 * Videobuf operations
240 */
pxa_videobuf_setup(struct videobuf_queue * vq,unsigned int * count,unsigned int * size)241 static int pxa_videobuf_setup(struct videobuf_queue *vq, unsigned int *count,
242 unsigned int *size)
243 {
244 struct soc_camera_device *icd = vq->priv_data;
245
246 dev_dbg(icd->parent, "count=%d, size=%d\n", *count, *size);
247
248 *size = icd->sizeimage;
249
250 if (0 == *count)
251 *count = 32;
252 if (*size * *count > vid_limit * 1024 * 1024)
253 *count = (vid_limit * 1024 * 1024) / *size;
254
255 return 0;
256 }
257
free_buffer(struct videobuf_queue * vq,struct pxa_buffer * buf)258 static void free_buffer(struct videobuf_queue *vq, struct pxa_buffer *buf)
259 {
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);
263 int i;
264
265 BUG_ON(in_interrupt());
266
267 dev_dbg(icd->parent, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
268 &buf->vb, buf->vb.baddr, buf->vb.bsize);
269
270 /*
271 * This waits until this buffer is out of danger, i.e., until it is no
272 * longer in STATE_QUEUED or STATE_ACTIVE
273 */
274 videobuf_waiton(vq, &buf->vb, 0, 0);
275 videobuf_dma_unmap(vq->dev, dma);
276 videobuf_dma_free(dma);
277
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,
282 buf->dmas[i].sg_cpu,
283 buf->dmas[i].sg_dma);
284 buf->dmas[i].sg_cpu = NULL;
285 }
286
287 buf->vb.state = VIDEOBUF_NEEDS_INIT;
288 }
289
calculate_dma_sglen(struct scatterlist * sglist,int sglen,int sg_first_ofs,int size)290 static int calculate_dma_sglen(struct scatterlist *sglist, int sglen,
291 int sg_first_ofs, int size)
292 {
293 int i, offset, dma_len, xfer_len;
294 struct scatterlist *sg;
295
296 offset = sg_first_ofs;
297 for_each_sg(sglist, sg, sglen, i) {
298 dma_len = sg_dma_len(sg);
299
300 /* PXA27x Developer's Manual 27.4.4.1: round up to 8 bytes */
301 xfer_len = roundup(min(dma_len - offset, size), 8);
302
303 size = max(0, size - xfer_len);
304 offset = 0;
305 if (size == 0)
306 break;
307 }
308
309 BUG_ON(size != 0);
310 return i + 1;
311 }
312
313 /**
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
323 *
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.
326 *
327 * Returns 0 or -ENOMEM if no coherent memory is available
328 */
pxa_init_dma_channel(struct pxa_camera_dev * pcdev,struct pxa_buffer * buf,struct videobuf_dmabuf * dma,int channel,int cibr,int size,struct scatterlist ** sg_first,int * sg_first_ofs)329 static int pxa_init_dma_channel(struct pxa_camera_dev *pcdev,
330 struct pxa_buffer *buf,
331 struct videobuf_dmabuf *dma, int channel,
332 int cibr, int size,
333 struct scatterlist **sg_first, int *sg_first_ofs)
334 {
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;
340
341 if (pxa_dma->sg_cpu)
342 dma_free_coherent(dev, pxa_dma->sg_size,
343 pxa_dma->sg_cpu, pxa_dma->sg_dma);
344
345 sglen = calculate_dma_sglen(*sg_first, dma->sglen,
346 *sg_first_ofs, size);
347
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)
352 return -ENOMEM;
353
354 pxa_dma->sglen = sglen;
355 offset = *sg_first_ofs;
356
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);
359
360
361 for_each_sg(*sg_first, sg, sglen, i) {
362 dma_len = sg_dma_len(sg);
363
364 /* PXA27x Developer's Manual 27.4.4.1: round up to 8 bytes */
365 xfer_len = roundup(min(dma_len - offset, size), 8);
366
367 size = max(0, size - xfer_len);
368
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;
373 #ifdef DEBUG
374 if (!i)
375 pxa_dma->sg_cpu[i].dcmd |= DCMD_STARTIRQEN;
376 #endif
377 pxa_dma->sg_cpu[i].ddadr =
378 pxa_dma->sg_dma + (i + 1) * sizeof(struct pxa_dma_desc);
379
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);
383 offset = 0;
384
385 if (size == 0)
386 break;
387 }
388
389 pxa_dma->sg_cpu[sglen].ddadr = DDADR_STOP;
390 pxa_dma->sg_cpu[sglen].dcmd = DCMD_FLOWSRC | DCMD_BURST8 | DCMD_ENDIRQEN;
391
392 /*
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
398 */
399 if (xfer_len >= dma_len) {
400 *sg_first_ofs = xfer_len - dma_len;
401 *sg_first = sg_next(sg);
402 } else {
403 *sg_first_ofs = xfer_len;
404 *sg_first = sg;
405 }
406
407 return 0;
408 }
409
pxa_videobuf_set_actdma(struct pxa_camera_dev * pcdev,struct pxa_buffer * buf)410 static void pxa_videobuf_set_actdma(struct pxa_camera_dev *pcdev,
411 struct pxa_buffer *buf)
412 {
413 buf->active_dma = DMA_Y;
414 if (pcdev->channels == 3)
415 buf->active_dma |= DMA_U | DMA_V;
416 }
417
418 /*
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.
423 */
pxa_videobuf_prepare(struct videobuf_queue * vq,struct videobuf_buffer * vb,enum v4l2_field field)424 static int pxa_videobuf_prepare(struct videobuf_queue *vq,
425 struct videobuf_buffer *vb, enum v4l2_field field)
426 {
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);
432 int ret;
433 int size_y, size_u = 0, size_v = 0;
434
435 dev_dbg(dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
436 vb, vb->baddr, vb->bsize);
437
438 /* Added list head initialization on alloc */
439 WARN_ON(!list_empty(&vb->queue));
440
441 #ifdef DEBUG
442 /*
443 * This can be useful if you want to see if we actually fill
444 * the buffer with something
445 */
446 memset((void *)vb->baddr, 0xaa, vb->bsize);
447 #endif
448
449 BUG_ON(NULL == icd->current_fmt);
450
451 /*
452 * I think, in buf_prepare you only have to protect global data,
453 * the actual buffer is yours
454 */
455 buf->inwork = 1;
456
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;
464 vb->field = field;
465 vb->state = VIDEOBUF_NEEDS_INIT;
466 }
467
468 vb->size = icd->sizeimage;
469 if (0 != vb->baddr && vb->bsize < vb->size) {
470 ret = -EINVAL;
471 goto out;
472 }
473
474 if (vb->state == VIDEOBUF_NEEDS_INIT) {
475 int size = vb->size;
476 int next_ofs = 0;
477 struct videobuf_dmabuf *dma = videobuf_to_dma(vb);
478 struct scatterlist *sg;
479
480 ret = videobuf_iolock(vq, vb, NULL);
481 if (ret)
482 goto fail;
483
484 if (pcdev->channels == 3) {
485 size_y = size / 2;
486 size_u = size_v = size / 4;
487 } else {
488 size_y = size;
489 }
490
491 sg = dma->sglist;
492
493 /* init DMA for Y channel */
494 ret = pxa_init_dma_channel(pcdev, buf, dma, 0, CIBR0, size_y,
495 &sg, &next_ofs);
496 if (ret) {
497 dev_err(dev, "DMA initialization for Y/RGB failed\n");
498 goto fail;
499 }
500
501 /* init DMA for U channel */
502 if (size_u)
503 ret = pxa_init_dma_channel(pcdev, buf, dma, 1, CIBR1,
504 size_u, &sg, &next_ofs);
505 if (ret) {
506 dev_err(dev, "DMA initialization for U failed\n");
507 goto fail_u;
508 }
509
510 /* init DMA for V channel */
511 if (size_v)
512 ret = pxa_init_dma_channel(pcdev, buf, dma, 2, CIBR2,
513 size_v, &sg, &next_ofs);
514 if (ret) {
515 dev_err(dev, "DMA initialization for V failed\n");
516 goto fail_v;
517 }
518
519 vb->state = VIDEOBUF_PREPARED;
520 }
521
522 buf->inwork = 0;
523 pxa_videobuf_set_actdma(pcdev, buf);
524
525 return 0;
526
527 fail_v:
528 dma_free_coherent(dev, buf->dmas[1].sg_size,
529 buf->dmas[1].sg_cpu, buf->dmas[1].sg_dma);
530 fail_u:
531 dma_free_coherent(dev, buf->dmas[0].sg_size,
532 buf->dmas[0].sg_cpu, buf->dmas[0].sg_dma);
533 fail:
534 free_buffer(vq, buf);
535 out:
536 buf->inwork = 0;
537 return ret;
538 }
539
540 /**
541 * pxa_dma_start_channels - start DMA channel for active buffer
542 * @pcdev: pxa camera device
543 *
544 * Initialize DMA channels to the beginning of the active video buffer, and
545 * start these channels.
546 */
pxa_dma_start_channels(struct pxa_camera_dev * pcdev)547 static void pxa_dma_start_channels(struct pxa_camera_dev *pcdev)
548 {
549 int i;
550 struct pxa_buffer *active;
551
552 active = pcdev->active;
553
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;
560 }
561 }
562
pxa_dma_stop_channels(struct pxa_camera_dev * pcdev)563 static void pxa_dma_stop_channels(struct pxa_camera_dev *pcdev)
564 {
565 int i;
566
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;
571 }
572 }
573
pxa_dma_add_tail_buf(struct pxa_camera_dev * pcdev,struct pxa_buffer * buf)574 static void pxa_dma_add_tail_buf(struct pxa_camera_dev *pcdev,
575 struct pxa_buffer *buf)
576 {
577 int i;
578 struct pxa_dma_desc *buf_last_desc;
579
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;
583
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;
587
588 /* Update the channel tail */
589 pcdev->sg_tail[i] = buf_last_desc;
590 }
591 }
592
593 /**
594 * pxa_camera_start_capture - start video capturing
595 * @pcdev: camera device
596 *
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.
600 */
pxa_camera_start_capture(struct pxa_camera_dev * pcdev)601 static void pxa_camera_start_capture(struct pxa_camera_dev *pcdev)
602 {
603 unsigned long cicr0;
604
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);
610 }
611
pxa_camera_stop_capture(struct pxa_camera_dev * pcdev)612 static void pxa_camera_stop_capture(struct pxa_camera_dev *pcdev)
613 {
614 unsigned long cicr0;
615
616 pxa_dma_stop_channels(pcdev);
617
618 cicr0 = __raw_readl(pcdev->base + CICR0) & ~CICR0_ENB;
619 __raw_writel(cicr0, pcdev->base + CICR0);
620
621 pcdev->active = NULL;
622 dev_dbg(pcdev->soc_host.v4l2_dev.dev, "%s\n", __func__);
623 }
624
625 /* Called under spinlock_irqsave(&pcdev->lock, ...) */
pxa_videobuf_queue(struct videobuf_queue * vq,struct videobuf_buffer * vb)626 static void pxa_videobuf_queue(struct videobuf_queue *vq,
627 struct videobuf_buffer *vb)
628 {
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);
633
634 dev_dbg(icd->parent, "%s (vb=0x%p) 0x%08lx %d active=%p\n",
635 __func__, vb, vb->baddr, vb->bsize, pcdev->active);
636
637 list_add_tail(&vb->queue, &pcdev->capture);
638
639 vb->state = VIDEOBUF_ACTIVE;
640 pxa_dma_add_tail_buf(pcdev, buf);
641
642 if (!pcdev->active)
643 pxa_camera_start_capture(pcdev);
644 }
645
pxa_videobuf_release(struct videobuf_queue * vq,struct videobuf_buffer * vb)646 static void pxa_videobuf_release(struct videobuf_queue *vq,
647 struct videobuf_buffer *vb)
648 {
649 struct pxa_buffer *buf = container_of(vb, struct pxa_buffer, vb);
650 #ifdef DEBUG
651 struct soc_camera_device *icd = vq->priv_data;
652 struct device *dev = icd->parent;
653
654 dev_dbg(dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
655 vb, vb->baddr, vb->bsize);
656
657 switch (vb->state) {
658 case VIDEOBUF_ACTIVE:
659 dev_dbg(dev, "%s (active)\n", __func__);
660 break;
661 case VIDEOBUF_QUEUED:
662 dev_dbg(dev, "%s (queued)\n", __func__);
663 break;
664 case VIDEOBUF_PREPARED:
665 dev_dbg(dev, "%s (prepared)\n", __func__);
666 break;
667 default:
668 dev_dbg(dev, "%s (unknown)\n", __func__);
669 break;
670 }
671 #endif
672
673 free_buffer(vq, buf);
674 }
675
pxa_camera_wakeup(struct pxa_camera_dev * pcdev,struct videobuf_buffer * vb,struct pxa_buffer * buf)676 static void pxa_camera_wakeup(struct pxa_camera_dev *pcdev,
677 struct videobuf_buffer *vb,
678 struct pxa_buffer *buf)
679 {
680 int i;
681
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);
686 vb->field_count++;
687 wake_up(&vb->done);
688 dev_dbg(pcdev->soc_host.v4l2_dev.dev, "%s dequeud buffer (vb=0x%p)\n",
689 __func__, vb);
690
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;
695 return;
696 }
697
698 pcdev->active = list_entry(pcdev->capture.next,
699 struct pxa_buffer, vb.queue);
700 }
701
702 /**
703 * pxa_camera_check_link_miss - check missed DMA linking
704 * @pcdev: camera device
705 *
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
712 *
713 * Please check the "DMA hot chaining timeslice issue" in
714 * Documentation/video4linux/pxa_camera.txt
715 *
716 * Context: should only be called within the dma irq handler
717 */
pxa_camera_check_link_miss(struct pxa_camera_dev * pcdev)718 static void pxa_camera_check_link_miss(struct pxa_camera_dev *pcdev)
719 {
720 int i, is_dma_stopped = 1;
721
722 for (i = 0; i < pcdev->channels; i++)
723 if (DDADR(pcdev->dma_chans[i]) != DDADR_STOP)
724 is_dma_stopped = 0;
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);
730 }
731
pxa_camera_dma_irq(int channel,struct pxa_camera_dev * pcdev,enum pxa_camera_active_dma act_dma)732 static void pxa_camera_dma_irq(int channel, struct pxa_camera_dev *pcdev,
733 enum pxa_camera_active_dma act_dma)
734 {
735 struct device *dev = pcdev->soc_host.v4l2_dev.dev;
736 struct pxa_buffer *buf;
737 unsigned long flags;
738 u32 status, camera_status, overrun;
739 struct videobuf_buffer *vb;
740
741 spin_lock_irqsave(&pcdev->lock, flags);
742
743 status = DCSR(channel);
744 DCSR(channel) = status;
745
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;
750
751 if (status & DCSR_BUSERR) {
752 dev_err(dev, "DMA Bus Error IRQ!\n");
753 goto out;
754 }
755
756 if (!(status & (DCSR_ENDINTR | DCSR_STARTINTR))) {
757 dev_err(dev, "Unknown DMA IRQ source, status: 0x%08x\n",
758 status);
759 goto out;
760 }
761
762 /*
763 * pcdev->active should not be NULL in DMA irq handler.
764 *
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.
767 *
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
772 * that is normal.
773 */
774 if (!pcdev->active)
775 goto out;
776
777 vb = &pcdev->active->vb;
778 buf = container_of(vb, struct pxa_buffer, vb);
779 WARN_ON(buf->inwork || list_empty(&vb->queue));
780
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));
784
785 if (status & DCSR_ENDINTR) {
786 /*
787 * It's normal if the last frame creates an overrun, as there
788 * are no more DMA descriptors to fetch from QCI fifos
789 */
790 if (camera_status & overrun &&
791 !list_is_last(pcdev->capture.next, &pcdev->capture)) {
792 dev_dbg(dev, "FIFO overrun! CISR: %x\n",
793 camera_status);
794 pxa_camera_stop_capture(pcdev);
795 pxa_camera_start_capture(pcdev);
796 goto out;
797 }
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);
802 }
803 }
804
805 out:
806 spin_unlock_irqrestore(&pcdev->lock, flags);
807 }
808
pxa_camera_dma_irq_y(int channel,void * data)809 static void pxa_camera_dma_irq_y(int channel, void *data)
810 {
811 struct pxa_camera_dev *pcdev = data;
812 pxa_camera_dma_irq(channel, pcdev, DMA_Y);
813 }
814
pxa_camera_dma_irq_u(int channel,void * data)815 static void pxa_camera_dma_irq_u(int channel, void *data)
816 {
817 struct pxa_camera_dev *pcdev = data;
818 pxa_camera_dma_irq(channel, pcdev, DMA_U);
819 }
820
pxa_camera_dma_irq_v(int channel,void * data)821 static void pxa_camera_dma_irq_v(int channel, void *data)
822 {
823 struct pxa_camera_dev *pcdev = data;
824 pxa_camera_dma_irq(channel, pcdev, DMA_V);
825 }
826
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,
832 };
833
pxa_camera_init_videobuf(struct videobuf_queue * q,struct soc_camera_device * icd)834 static void pxa_camera_init_videobuf(struct videobuf_queue *q,
835 struct soc_camera_device *icd)
836 {
837 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
838 struct pxa_camera_dev *pcdev = ici->priv;
839
840 /*
841 * We must pass NULL as dev pointer, then all pci_* dma operations
842 * transform to normal dma_* ones.
843 */
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);
847 }
848
mclk_get_divisor(struct platform_device * pdev,struct pxa_camera_dev * pcdev)849 static u32 mclk_get_divisor(struct platform_device *pdev,
850 struct pxa_camera_dev *pcdev)
851 {
852 unsigned long mclk = pcdev->mclk;
853 struct device *dev = &pdev->dev;
854 u32 div;
855 unsigned long lcdclk;
856
857 lcdclk = clk_get_rate(pcdev->clk);
858 pcdev->ciclk = lcdclk;
859
860 /* mclk <= ciclk / 4 (27.4.2) */
861 if (mclk > lcdclk / 4) {
862 mclk = lcdclk / 4;
863 dev_warn(dev, "Limiting master clock to %lu\n", mclk);
864 }
865
866 /* We verify mclk != 0, so if anyone breaks it, here comes their Oops */
867 div = (lcdclk + 2 * mclk - 1) / (2 * mclk) - 1;
868
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));
872
873 dev_dbg(dev, "LCD clock %luHz, target freq %luHz, divisor %u\n",
874 lcdclk, mclk, div);
875
876 return div;
877 }
878
recalculate_fifo_timeout(struct pxa_camera_dev * pcdev,unsigned long pclk)879 static void recalculate_fifo_timeout(struct pxa_camera_dev *pcdev,
880 unsigned long pclk)
881 {
882 /* We want a timeout > 1 pixel time, not ">=" */
883 u32 ciclk_per_pixel = pcdev->ciclk / pclk + 1;
884
885 __raw_writel(ciclk_per_pixel, pcdev->base + CITOR);
886 }
887
pxa_camera_activate(struct pxa_camera_dev * pcdev)888 static void pxa_camera_activate(struct pxa_camera_dev *pcdev)
889 {
890 u32 cicr4 = 0;
891
892 /* disable all interrupts */
893 __raw_writel(0x3ff, pcdev->base + CICR0);
894
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)
900 cicr4 |= CICR4_PCP;
901 if (pcdev->platform_flags & PXA_CAMERA_HSP)
902 cicr4 |= CICR4_HSP;
903 if (pcdev->platform_flags & PXA_CAMERA_VSP)
904 cicr4 |= CICR4_VSP;
905
906 __raw_writel(pcdev->mclk_divisor | cicr4, pcdev->base + CICR4);
907
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);
911 else
912 /* "Safe default" - 13MHz */
913 recalculate_fifo_timeout(pcdev, 13000000);
914
915 clk_prepare_enable(pcdev->clk);
916 }
917
pxa_camera_deactivate(struct pxa_camera_dev * pcdev)918 static void pxa_camera_deactivate(struct pxa_camera_dev *pcdev)
919 {
920 clk_disable_unprepare(pcdev->clk);
921 }
922
pxa_camera_irq(int irq,void * data)923 static irqreturn_t pxa_camera_irq(int irq, void *data)
924 {
925 struct pxa_camera_dev *pcdev = data;
926 unsigned long status, cifr, cicr0;
927 struct pxa_buffer *buf;
928 struct videobuf_buffer *vb;
929
930 status = __raw_readl(pcdev->base + CISR);
931 dev_dbg(pcdev->soc_host.v4l2_dev.dev,
932 "Camera interrupt status 0x%lx\n", status);
933
934 if (!status)
935 return IRQ_NONE;
936
937 __raw_writel(status, pcdev->base + CISR);
938
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);
943
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);
949
950 pxa_dma_start_channels(pcdev);
951
952 cicr0 = __raw_readl(pcdev->base + CICR0) | CICR0_EOFM;
953 __raw_writel(cicr0, pcdev->base + CICR0);
954 }
955
956 return IRQ_HANDLED;
957 }
958
pxa_camera_add_device(struct soc_camera_device * icd)959 static int pxa_camera_add_device(struct soc_camera_device *icd)
960 {
961 dev_info(icd->parent, "PXA Camera driver attached to camera %d\n",
962 icd->devnum);
963
964 return 0;
965 }
966
pxa_camera_remove_device(struct soc_camera_device * icd)967 static void pxa_camera_remove_device(struct soc_camera_device *icd)
968 {
969 dev_info(icd->parent, "PXA Camera driver detached from camera %d\n",
970 icd->devnum);
971 }
972
973 /*
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
977 */
pxa_camera_clock_start(struct soc_camera_host * ici)978 static int pxa_camera_clock_start(struct soc_camera_host *ici)
979 {
980 struct pxa_camera_dev *pcdev = ici->priv;
981
982 pxa_camera_activate(pcdev);
983
984 return 0;
985 }
986
987 /* Called with .host_lock held */
pxa_camera_clock_stop(struct soc_camera_host * ici)988 static void pxa_camera_clock_stop(struct soc_camera_host *ici)
989 {
990 struct pxa_camera_dev *pcdev = ici->priv;
991
992 /* disable capture, disable interrupts */
993 __raw_writel(0x3ff, pcdev->base + CICR0);
994
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;
999
1000 pxa_camera_deactivate(pcdev);
1001 }
1002
test_platform_param(struct pxa_camera_dev * pcdev,unsigned char buswidth,unsigned long * flags)1003 static int test_platform_param(struct pxa_camera_dev *pcdev,
1004 unsigned char buswidth, unsigned long *flags)
1005 {
1006 /*
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.
1010 */
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;
1020
1021 /* If requested data width is supported by the platform, use it */
1022 if ((1 << (buswidth - 1)) & pcdev->width_flags)
1023 return 0;
1024
1025 return -EINVAL;
1026 }
1027
pxa_camera_setup_cicr(struct soc_camera_device * icd,unsigned long flags,__u32 pixfmt)1028 static void pxa_camera_setup_cicr(struct soc_camera_device *icd,
1029 unsigned long flags, __u32 pixfmt)
1030 {
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);
1037
1038 if (ret < 0)
1039 y_skip_top = 0;
1040
1041 /*
1042 * Datawidth is now guaranteed to be equal to one of the three values.
1043 * We fix bit-per-pixel equal to data-width...
1044 */
1045 switch (icd->current_fmt->host_fmt->bits_per_sample) {
1046 case 10:
1047 dw = 4;
1048 bpp = 0x40;
1049 break;
1050 case 9:
1051 dw = 3;
1052 bpp = 0x20;
1053 break;
1054 default:
1055 /*
1056 * Actually it can only be 8 now,
1057 * default is just to silence compiler warnings
1058 */
1059 case 8:
1060 dw = 2;
1061 bpp = 0;
1062 }
1063
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)
1069 cicr4 |= CICR4_PCP;
1070 if (flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)
1071 cicr4 |= CICR4_HSP;
1072 if (flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
1073 cicr4 |= CICR4_VSP;
1074
1075 cicr0 = __raw_readl(pcdev->base + CICR0);
1076 if (cicr0 & CICR0_ENB)
1077 __raw_writel(cicr0 & ~CICR0_ENB, pcdev->base + CICR0);
1078
1079 cicr1 = CICR1_PPL_VAL(icd->user_width - 1) | bpp | dw;
1080
1081 switch (pixfmt) {
1082 case V4L2_PIX_FMT_YUV422P:
1083 pcdev->channels = 3;
1084 cicr1 |= CICR1_YCBCR_F;
1085 /*
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.
1091 */
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);
1097 break;
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);
1101 break;
1102 case V4L2_PIX_FMT_RGB565:
1103 cicr1 |= CICR1_COLOR_SP_VAL(1) | CICR1_RGB_BPP_VAL(2);
1104 break;
1105 }
1106
1107 cicr2 = 0;
1108 cicr3 = CICR3_LPF_VAL(icd->user_height - 1) |
1109 CICR3_BFW_VAL(min((u32)255, y_skip_top));
1110 cicr4 |= pcdev->mclk_divisor;
1111
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);
1116
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);
1122 }
1123
pxa_camera_set_bus_param(struct soc_camera_device * icd)1124 static int pxa_camera_set_bus_param(struct soc_camera_device *icd)
1125 {
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;
1132 int ret;
1133 struct pxa_cam *cam = icd->host_priv;
1134
1135 ret = test_platform_param(pcdev, icd->current_fmt->host_fmt->bits_per_sample,
1136 &bus_flags);
1137 if (ret < 0)
1138 return ret;
1139
1140 ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
1141 if (!ret) {
1142 common_flags = soc_mbus_config_compatible(&cfg,
1143 bus_flags);
1144 if (!common_flags) {
1145 dev_warn(icd->parent,
1146 "Flags incompatible: camera 0x%x, host 0x%lx\n",
1147 cfg.flags, bus_flags);
1148 return -EINVAL;
1149 }
1150 } else if (ret != -ENOIOCTLCMD) {
1151 return ret;
1152 } else {
1153 common_flags = bus_flags;
1154 }
1155
1156 pcdev->channels = 1;
1157
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;
1163 else
1164 common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_LOW;
1165 }
1166
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;
1171 else
1172 common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_LOW;
1173 }
1174
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;
1179 else
1180 common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_FALLING;
1181 }
1182
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",
1187 common_flags, ret);
1188 return ret;
1189 }
1190
1191 cam->flags = common_flags;
1192
1193 pxa_camera_setup_cicr(icd, common_flags, pixfmt);
1194
1195 return 0;
1196 }
1197
pxa_camera_try_bus_param(struct soc_camera_device * icd,unsigned char buswidth)1198 static int pxa_camera_try_bus_param(struct soc_camera_device *icd,
1199 unsigned char buswidth)
1200 {
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);
1207
1208 if (ret < 0)
1209 return ret;
1210
1211 ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
1212 if (!ret) {
1213 common_flags = soc_mbus_config_compatible(&cfg,
1214 bus_flags);
1215 if (!common_flags) {
1216 dev_warn(icd->parent,
1217 "Flags incompatible: camera 0x%x, host 0x%lx\n",
1218 cfg.flags, bus_flags);
1219 return -EINVAL;
1220 }
1221 } else if (ret == -ENOIOCTLCMD) {
1222 ret = 0;
1223 }
1224
1225 return ret;
1226 }
1227
1228 static const struct soc_mbus_pixelfmt pxa_camera_formats[] = {
1229 {
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,
1236 },
1237 };
1238
1239 /* This will be corrected as we get more formats */
pxa_camera_packing_supported(const struct soc_mbus_pixelfmt * fmt)1240 static bool pxa_camera_packing_supported(const struct soc_mbus_pixelfmt *fmt)
1241 {
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);
1247 }
1248
pxa_camera_get_formats(struct soc_camera_device * icd,unsigned int idx,struct soc_camera_format_xlate * xlate)1249 static int pxa_camera_get_formats(struct soc_camera_device *icd, unsigned int idx,
1250 struct soc_camera_format_xlate *xlate)
1251 {
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 u32 code;
1257 const struct soc_mbus_pixelfmt *fmt;
1258
1259 ret = v4l2_subdev_call(sd, video, enum_mbus_fmt, idx, &code);
1260 if (ret < 0)
1261 /* No more formats */
1262 return 0;
1263
1264 fmt = soc_mbus_get_fmtdesc(code);
1265 if (!fmt) {
1266 dev_err(dev, "Invalid format code #%u: %d\n", idx, code);
1267 return 0;
1268 }
1269
1270 /* This also checks support for the requested bits-per-sample */
1271 ret = pxa_camera_try_bus_param(icd, fmt->bits_per_sample);
1272 if (ret < 0)
1273 return 0;
1274
1275 if (!icd->host_priv) {
1276 cam = kzalloc(sizeof(*cam), GFP_KERNEL);
1277 if (!cam)
1278 return -ENOMEM;
1279
1280 icd->host_priv = cam;
1281 } else {
1282 cam = icd->host_priv;
1283 }
1284
1285 switch (code) {
1286 case MEDIA_BUS_FMT_UYVY8_2X8:
1287 formats++;
1288 if (xlate) {
1289 xlate->host_fmt = &pxa_camera_formats[0];
1290 xlate->code = code;
1291 xlate++;
1292 dev_dbg(dev, "Providing format %s using code %d\n",
1293 pxa_camera_formats[0].name, code);
1294 }
1295 case MEDIA_BUS_FMT_VYUY8_2X8:
1296 case MEDIA_BUS_FMT_YUYV8_2X8:
1297 case MEDIA_BUS_FMT_YVYU8_2X8:
1298 case MEDIA_BUS_FMT_RGB565_2X8_LE:
1299 case MEDIA_BUS_FMT_RGB555_2X8_PADHI_LE:
1300 if (xlate)
1301 dev_dbg(dev, "Providing format %s packed\n",
1302 fmt->name);
1303 break;
1304 default:
1305 if (!pxa_camera_packing_supported(fmt))
1306 return 0;
1307 if (xlate)
1308 dev_dbg(dev,
1309 "Providing format %s in pass-through mode\n",
1310 fmt->name);
1311 }
1312
1313 /* Generic pass-through */
1314 formats++;
1315 if (xlate) {
1316 xlate->host_fmt = fmt;
1317 xlate->code = code;
1318 xlate++;
1319 }
1320
1321 return formats;
1322 }
1323
pxa_camera_put_formats(struct soc_camera_device * icd)1324 static void pxa_camera_put_formats(struct soc_camera_device *icd)
1325 {
1326 kfree(icd->host_priv);
1327 icd->host_priv = NULL;
1328 }
1329
pxa_camera_check_frame(u32 width,u32 height)1330 static int pxa_camera_check_frame(u32 width, u32 height)
1331 {
1332 /* limit to pxa hardware capabilities */
1333 return height < 32 || height > 2048 || width < 48 || width > 2048 ||
1334 (width & 0x01);
1335 }
1336
pxa_camera_set_crop(struct soc_camera_device * icd,const struct v4l2_crop * a)1337 static int pxa_camera_set_crop(struct soc_camera_device *icd,
1338 const struct v4l2_crop *a)
1339 {
1340 const struct v4l2_rect *rect = &a->c;
1341 struct device *dev = icd->parent;
1342 struct soc_camera_host *ici = to_soc_camera_host(dev);
1343 struct pxa_camera_dev *pcdev = ici->priv;
1344 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1345 struct soc_camera_sense sense = {
1346 .master_clock = pcdev->mclk,
1347 .pixel_clock_max = pcdev->ciclk / 4,
1348 };
1349 struct v4l2_mbus_framefmt mf;
1350 struct pxa_cam *cam = icd->host_priv;
1351 u32 fourcc = icd->current_fmt->host_fmt->fourcc;
1352 int ret;
1353
1354 /* If PCLK is used to latch data from the sensor, check sense */
1355 if (pcdev->platform_flags & PXA_CAMERA_PCLK_EN)
1356 icd->sense = &sense;
1357
1358 ret = v4l2_subdev_call(sd, video, s_crop, a);
1359
1360 icd->sense = NULL;
1361
1362 if (ret < 0) {
1363 dev_warn(dev, "Failed to crop to %ux%u@%u:%u\n",
1364 rect->width, rect->height, rect->left, rect->top);
1365 return ret;
1366 }
1367
1368 ret = v4l2_subdev_call(sd, video, g_mbus_fmt, &mf);
1369 if (ret < 0)
1370 return ret;
1371
1372 if (pxa_camera_check_frame(mf.width, mf.height)) {
1373 /*
1374 * Camera cropping produced a frame beyond our capabilities.
1375 * FIXME: just extract a subframe, that we can process.
1376 */
1377 v4l_bound_align_image(&mf.width, 48, 2048, 1,
1378 &mf.height, 32, 2048, 0,
1379 fourcc == V4L2_PIX_FMT_YUV422P ? 4 : 0);
1380 ret = v4l2_subdev_call(sd, video, s_mbus_fmt, &mf);
1381 if (ret < 0)
1382 return ret;
1383
1384 if (pxa_camera_check_frame(mf.width, mf.height)) {
1385 dev_warn(icd->parent,
1386 "Inconsistent state. Use S_FMT to repair\n");
1387 return -EINVAL;
1388 }
1389 }
1390
1391 if (sense.flags & SOCAM_SENSE_PCLK_CHANGED) {
1392 if (sense.pixel_clock > sense.pixel_clock_max) {
1393 dev_err(dev,
1394 "pixel clock %lu set by the camera too high!",
1395 sense.pixel_clock);
1396 return -EIO;
1397 }
1398 recalculate_fifo_timeout(pcdev, sense.pixel_clock);
1399 }
1400
1401 icd->user_width = mf.width;
1402 icd->user_height = mf.height;
1403
1404 pxa_camera_setup_cicr(icd, cam->flags, fourcc);
1405
1406 return ret;
1407 }
1408
pxa_camera_set_fmt(struct soc_camera_device * icd,struct v4l2_format * f)1409 static int pxa_camera_set_fmt(struct soc_camera_device *icd,
1410 struct v4l2_format *f)
1411 {
1412 struct device *dev = icd->parent;
1413 struct soc_camera_host *ici = to_soc_camera_host(dev);
1414 struct pxa_camera_dev *pcdev = ici->priv;
1415 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1416 const struct soc_camera_format_xlate *xlate = NULL;
1417 struct soc_camera_sense sense = {
1418 .master_clock = pcdev->mclk,
1419 .pixel_clock_max = pcdev->ciclk / 4,
1420 };
1421 struct v4l2_pix_format *pix = &f->fmt.pix;
1422 struct v4l2_mbus_framefmt mf;
1423 int ret;
1424
1425 xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
1426 if (!xlate) {
1427 dev_warn(dev, "Format %x not found\n", pix->pixelformat);
1428 return -EINVAL;
1429 }
1430
1431 /* If PCLK is used to latch data from the sensor, check sense */
1432 if (pcdev->platform_flags & PXA_CAMERA_PCLK_EN)
1433 /* The caller holds a mutex. */
1434 icd->sense = &sense;
1435
1436 mf.width = pix->width;
1437 mf.height = pix->height;
1438 mf.field = pix->field;
1439 mf.colorspace = pix->colorspace;
1440 mf.code = xlate->code;
1441
1442 ret = v4l2_subdev_call(sd, video, s_mbus_fmt, &mf);
1443
1444 if (mf.code != xlate->code)
1445 return -EINVAL;
1446
1447 icd->sense = NULL;
1448
1449 if (ret < 0) {
1450 dev_warn(dev, "Failed to configure for format %x\n",
1451 pix->pixelformat);
1452 } else if (pxa_camera_check_frame(mf.width, mf.height)) {
1453 dev_warn(dev,
1454 "Camera driver produced an unsupported frame %dx%d\n",
1455 mf.width, mf.height);
1456 ret = -EINVAL;
1457 } else if (sense.flags & SOCAM_SENSE_PCLK_CHANGED) {
1458 if (sense.pixel_clock > sense.pixel_clock_max) {
1459 dev_err(dev,
1460 "pixel clock %lu set by the camera too high!",
1461 sense.pixel_clock);
1462 return -EIO;
1463 }
1464 recalculate_fifo_timeout(pcdev, sense.pixel_clock);
1465 }
1466
1467 if (ret < 0)
1468 return ret;
1469
1470 pix->width = mf.width;
1471 pix->height = mf.height;
1472 pix->field = mf.field;
1473 pix->colorspace = mf.colorspace;
1474 icd->current_fmt = xlate;
1475
1476 return ret;
1477 }
1478
pxa_camera_try_fmt(struct soc_camera_device * icd,struct v4l2_format * f)1479 static int pxa_camera_try_fmt(struct soc_camera_device *icd,
1480 struct v4l2_format *f)
1481 {
1482 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1483 const struct soc_camera_format_xlate *xlate;
1484 struct v4l2_pix_format *pix = &f->fmt.pix;
1485 struct v4l2_mbus_framefmt mf;
1486 __u32 pixfmt = pix->pixelformat;
1487 int ret;
1488
1489 xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1490 if (!xlate) {
1491 dev_warn(icd->parent, "Format %x not found\n", pixfmt);
1492 return -EINVAL;
1493 }
1494
1495 /*
1496 * Limit to pxa hardware capabilities. YUV422P planar format requires
1497 * images size to be a multiple of 16 bytes. If not, zeros will be
1498 * inserted between Y and U planes, and U and V planes, which violates
1499 * the YUV422P standard.
1500 */
1501 v4l_bound_align_image(&pix->width, 48, 2048, 1,
1502 &pix->height, 32, 2048, 0,
1503 pixfmt == V4L2_PIX_FMT_YUV422P ? 4 : 0);
1504
1505 /* limit to sensor capabilities */
1506 mf.width = pix->width;
1507 mf.height = pix->height;
1508 /* Only progressive video supported so far */
1509 mf.field = V4L2_FIELD_NONE;
1510 mf.colorspace = pix->colorspace;
1511 mf.code = xlate->code;
1512
1513 ret = v4l2_subdev_call(sd, video, try_mbus_fmt, &mf);
1514 if (ret < 0)
1515 return ret;
1516
1517 pix->width = mf.width;
1518 pix->height = mf.height;
1519 pix->colorspace = mf.colorspace;
1520
1521 switch (mf.field) {
1522 case V4L2_FIELD_ANY:
1523 case V4L2_FIELD_NONE:
1524 pix->field = V4L2_FIELD_NONE;
1525 break;
1526 default:
1527 /* TODO: support interlaced at least in pass-through mode */
1528 dev_err(icd->parent, "Field type %d unsupported.\n",
1529 mf.field);
1530 return -EINVAL;
1531 }
1532
1533 return ret;
1534 }
1535
pxa_camera_reqbufs(struct soc_camera_device * icd,struct v4l2_requestbuffers * p)1536 static int pxa_camera_reqbufs(struct soc_camera_device *icd,
1537 struct v4l2_requestbuffers *p)
1538 {
1539 int i;
1540
1541 /*
1542 * This is for locking debugging only. I removed spinlocks and now I
1543 * check whether .prepare is ever called on a linked buffer, or whether
1544 * a dma IRQ can occur for an in-work or unlinked buffer. Until now
1545 * it hadn't triggered
1546 */
1547 for (i = 0; i < p->count; i++) {
1548 struct pxa_buffer *buf = container_of(icd->vb_vidq.bufs[i],
1549 struct pxa_buffer, vb);
1550 buf->inwork = 0;
1551 INIT_LIST_HEAD(&buf->vb.queue);
1552 }
1553
1554 return 0;
1555 }
1556
pxa_camera_poll(struct file * file,poll_table * pt)1557 static unsigned int pxa_camera_poll(struct file *file, poll_table *pt)
1558 {
1559 struct soc_camera_device *icd = file->private_data;
1560 struct pxa_buffer *buf;
1561
1562 buf = list_entry(icd->vb_vidq.stream.next, struct pxa_buffer,
1563 vb.stream);
1564
1565 poll_wait(file, &buf->vb.done, pt);
1566
1567 if (buf->vb.state == VIDEOBUF_DONE ||
1568 buf->vb.state == VIDEOBUF_ERROR)
1569 return POLLIN|POLLRDNORM;
1570
1571 return 0;
1572 }
1573
pxa_camera_querycap(struct soc_camera_host * ici,struct v4l2_capability * cap)1574 static int pxa_camera_querycap(struct soc_camera_host *ici,
1575 struct v4l2_capability *cap)
1576 {
1577 /* cap->name is set by the firendly caller:-> */
1578 strlcpy(cap->card, pxa_cam_driver_description, sizeof(cap->card));
1579 cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
1580 cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
1581
1582 return 0;
1583 }
1584
pxa_camera_suspend(struct device * dev)1585 static int pxa_camera_suspend(struct device *dev)
1586 {
1587 struct soc_camera_host *ici = to_soc_camera_host(dev);
1588 struct pxa_camera_dev *pcdev = ici->priv;
1589 int i = 0, ret = 0;
1590
1591 pcdev->save_cicr[i++] = __raw_readl(pcdev->base + CICR0);
1592 pcdev->save_cicr[i++] = __raw_readl(pcdev->base + CICR1);
1593 pcdev->save_cicr[i++] = __raw_readl(pcdev->base + CICR2);
1594 pcdev->save_cicr[i++] = __raw_readl(pcdev->base + CICR3);
1595 pcdev->save_cicr[i++] = __raw_readl(pcdev->base + CICR4);
1596
1597 if (pcdev->soc_host.icd) {
1598 struct v4l2_subdev *sd = soc_camera_to_subdev(pcdev->soc_host.icd);
1599 ret = v4l2_subdev_call(sd, core, s_power, 0);
1600 if (ret == -ENOIOCTLCMD)
1601 ret = 0;
1602 }
1603
1604 return ret;
1605 }
1606
pxa_camera_resume(struct device * dev)1607 static int pxa_camera_resume(struct device *dev)
1608 {
1609 struct soc_camera_host *ici = to_soc_camera_host(dev);
1610 struct pxa_camera_dev *pcdev = ici->priv;
1611 int i = 0, ret = 0;
1612
1613 DRCMR(68) = pcdev->dma_chans[0] | DRCMR_MAPVLD;
1614 DRCMR(69) = pcdev->dma_chans[1] | DRCMR_MAPVLD;
1615 DRCMR(70) = pcdev->dma_chans[2] | DRCMR_MAPVLD;
1616
1617 __raw_writel(pcdev->save_cicr[i++] & ~CICR0_ENB, pcdev->base + CICR0);
1618 __raw_writel(pcdev->save_cicr[i++], pcdev->base + CICR1);
1619 __raw_writel(pcdev->save_cicr[i++], pcdev->base + CICR2);
1620 __raw_writel(pcdev->save_cicr[i++], pcdev->base + CICR3);
1621 __raw_writel(pcdev->save_cicr[i++], pcdev->base + CICR4);
1622
1623 if (pcdev->soc_host.icd) {
1624 struct v4l2_subdev *sd = soc_camera_to_subdev(pcdev->soc_host.icd);
1625 ret = v4l2_subdev_call(sd, core, s_power, 1);
1626 if (ret == -ENOIOCTLCMD)
1627 ret = 0;
1628 }
1629
1630 /* Restart frame capture if active buffer exists */
1631 if (!ret && pcdev->active)
1632 pxa_camera_start_capture(pcdev);
1633
1634 return ret;
1635 }
1636
1637 static struct soc_camera_host_ops pxa_soc_camera_host_ops = {
1638 .owner = THIS_MODULE,
1639 .add = pxa_camera_add_device,
1640 .remove = pxa_camera_remove_device,
1641 .clock_start = pxa_camera_clock_start,
1642 .clock_stop = pxa_camera_clock_stop,
1643 .set_crop = pxa_camera_set_crop,
1644 .get_formats = pxa_camera_get_formats,
1645 .put_formats = pxa_camera_put_formats,
1646 .set_fmt = pxa_camera_set_fmt,
1647 .try_fmt = pxa_camera_try_fmt,
1648 .init_videobuf = pxa_camera_init_videobuf,
1649 .reqbufs = pxa_camera_reqbufs,
1650 .poll = pxa_camera_poll,
1651 .querycap = pxa_camera_querycap,
1652 .set_bus_param = pxa_camera_set_bus_param,
1653 };
1654
pxa_camera_pdata_from_dt(struct device * dev,struct pxa_camera_dev * pcdev)1655 static int pxa_camera_pdata_from_dt(struct device *dev,
1656 struct pxa_camera_dev *pcdev)
1657 {
1658 u32 mclk_rate;
1659 struct device_node *np = dev->of_node;
1660 struct v4l2_of_endpoint ep;
1661 int err = of_property_read_u32(np, "clock-frequency",
1662 &mclk_rate);
1663 if (!err) {
1664 pcdev->platform_flags |= PXA_CAMERA_MCLK_EN;
1665 pcdev->mclk = mclk_rate;
1666 }
1667
1668 np = of_graph_get_next_endpoint(np, NULL);
1669 if (!np) {
1670 dev_err(dev, "could not find endpoint\n");
1671 return -EINVAL;
1672 }
1673
1674 err = v4l2_of_parse_endpoint(np, &ep);
1675 if (err) {
1676 dev_err(dev, "could not parse endpoint\n");
1677 goto out;
1678 }
1679
1680 switch (ep.bus.parallel.bus_width) {
1681 case 4:
1682 pcdev->platform_flags |= PXA_CAMERA_DATAWIDTH_4;
1683 break;
1684 case 5:
1685 pcdev->platform_flags |= PXA_CAMERA_DATAWIDTH_5;
1686 break;
1687 case 8:
1688 pcdev->platform_flags |= PXA_CAMERA_DATAWIDTH_8;
1689 break;
1690 case 9:
1691 pcdev->platform_flags |= PXA_CAMERA_DATAWIDTH_9;
1692 break;
1693 case 10:
1694 pcdev->platform_flags |= PXA_CAMERA_DATAWIDTH_10;
1695 break;
1696 default:
1697 break;
1698 }
1699
1700 if (ep.bus.parallel.flags & V4L2_MBUS_MASTER)
1701 pcdev->platform_flags |= PXA_CAMERA_MASTER;
1702 if (ep.bus.parallel.flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH)
1703 pcdev->platform_flags |= PXA_CAMERA_HSP;
1704 if (ep.bus.parallel.flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH)
1705 pcdev->platform_flags |= PXA_CAMERA_VSP;
1706 if (ep.bus.parallel.flags & V4L2_MBUS_PCLK_SAMPLE_RISING)
1707 pcdev->platform_flags |= PXA_CAMERA_PCLK_EN | PXA_CAMERA_PCP;
1708 if (ep.bus.parallel.flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)
1709 pcdev->platform_flags |= PXA_CAMERA_PCLK_EN;
1710
1711 out:
1712 of_node_put(np);
1713
1714 return err;
1715 }
1716
pxa_camera_probe(struct platform_device * pdev)1717 static int pxa_camera_probe(struct platform_device *pdev)
1718 {
1719 struct pxa_camera_dev *pcdev;
1720 struct resource *res;
1721 void __iomem *base;
1722 int irq;
1723 int err = 0;
1724
1725 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1726 irq = platform_get_irq(pdev, 0);
1727 if (!res || irq < 0)
1728 return -ENODEV;
1729
1730 pcdev = devm_kzalloc(&pdev->dev, sizeof(*pcdev), GFP_KERNEL);
1731 if (!pcdev) {
1732 dev_err(&pdev->dev, "Could not allocate pcdev\n");
1733 return -ENOMEM;
1734 }
1735
1736 pcdev->clk = devm_clk_get(&pdev->dev, NULL);
1737 if (IS_ERR(pcdev->clk))
1738 return PTR_ERR(pcdev->clk);
1739
1740 pcdev->res = res;
1741
1742 pcdev->pdata = pdev->dev.platform_data;
1743 if (&pdev->dev.of_node && !pcdev->pdata) {
1744 err = pxa_camera_pdata_from_dt(&pdev->dev, pcdev);
1745 } else {
1746 pcdev->platform_flags = pcdev->pdata->flags;
1747 pcdev->mclk = pcdev->pdata->mclk_10khz * 10000;
1748 }
1749 if (err < 0)
1750 return err;
1751
1752 if (!(pcdev->platform_flags & (PXA_CAMERA_DATAWIDTH_8 |
1753 PXA_CAMERA_DATAWIDTH_9 | PXA_CAMERA_DATAWIDTH_10))) {
1754 /*
1755 * Platform hasn't set available data widths. This is bad.
1756 * Warn and use a default.
1757 */
1758 dev_warn(&pdev->dev, "WARNING! Platform hasn't set available "
1759 "data widths, using default 10 bit\n");
1760 pcdev->platform_flags |= PXA_CAMERA_DATAWIDTH_10;
1761 }
1762 if (pcdev->platform_flags & PXA_CAMERA_DATAWIDTH_8)
1763 pcdev->width_flags = 1 << 7;
1764 if (pcdev->platform_flags & PXA_CAMERA_DATAWIDTH_9)
1765 pcdev->width_flags |= 1 << 8;
1766 if (pcdev->platform_flags & PXA_CAMERA_DATAWIDTH_10)
1767 pcdev->width_flags |= 1 << 9;
1768 if (!pcdev->mclk) {
1769 dev_warn(&pdev->dev,
1770 "mclk == 0! Please, fix your platform data. "
1771 "Using default 20MHz\n");
1772 pcdev->mclk = 20000000;
1773 }
1774
1775 pcdev->mclk_divisor = mclk_get_divisor(pdev, pcdev);
1776
1777 INIT_LIST_HEAD(&pcdev->capture);
1778 spin_lock_init(&pcdev->lock);
1779
1780 /*
1781 * Request the regions.
1782 */
1783 base = devm_ioremap_resource(&pdev->dev, res);
1784 if (IS_ERR(base))
1785 return PTR_ERR(base);
1786
1787 pcdev->irq = irq;
1788 pcdev->base = base;
1789
1790 /* request dma */
1791 err = pxa_request_dma("CI_Y", DMA_PRIO_HIGH,
1792 pxa_camera_dma_irq_y, pcdev);
1793 if (err < 0) {
1794 dev_err(&pdev->dev, "Can't request DMA for Y\n");
1795 return err;
1796 }
1797 pcdev->dma_chans[0] = err;
1798 dev_dbg(&pdev->dev, "got DMA channel %d\n", pcdev->dma_chans[0]);
1799
1800 err = pxa_request_dma("CI_U", DMA_PRIO_HIGH,
1801 pxa_camera_dma_irq_u, pcdev);
1802 if (err < 0) {
1803 dev_err(&pdev->dev, "Can't request DMA for U\n");
1804 goto exit_free_dma_y;
1805 }
1806 pcdev->dma_chans[1] = err;
1807 dev_dbg(&pdev->dev, "got DMA channel (U) %d\n", pcdev->dma_chans[1]);
1808
1809 err = pxa_request_dma("CI_V", DMA_PRIO_HIGH,
1810 pxa_camera_dma_irq_v, pcdev);
1811 if (err < 0) {
1812 dev_err(&pdev->dev, "Can't request DMA for V\n");
1813 goto exit_free_dma_u;
1814 }
1815 pcdev->dma_chans[2] = err;
1816 dev_dbg(&pdev->dev, "got DMA channel (V) %d\n", pcdev->dma_chans[2]);
1817
1818 DRCMR(68) = pcdev->dma_chans[0] | DRCMR_MAPVLD;
1819 DRCMR(69) = pcdev->dma_chans[1] | DRCMR_MAPVLD;
1820 DRCMR(70) = pcdev->dma_chans[2] | DRCMR_MAPVLD;
1821
1822 /* request irq */
1823 err = devm_request_irq(&pdev->dev, pcdev->irq, pxa_camera_irq, 0,
1824 PXA_CAM_DRV_NAME, pcdev);
1825 if (err) {
1826 dev_err(&pdev->dev, "Camera interrupt register failed\n");
1827 goto exit_free_dma;
1828 }
1829
1830 pcdev->soc_host.drv_name = PXA_CAM_DRV_NAME;
1831 pcdev->soc_host.ops = &pxa_soc_camera_host_ops;
1832 pcdev->soc_host.priv = pcdev;
1833 pcdev->soc_host.v4l2_dev.dev = &pdev->dev;
1834 pcdev->soc_host.nr = pdev->id;
1835
1836 err = soc_camera_host_register(&pcdev->soc_host);
1837 if (err)
1838 goto exit_free_dma;
1839
1840 return 0;
1841
1842 exit_free_dma:
1843 pxa_free_dma(pcdev->dma_chans[2]);
1844 exit_free_dma_u:
1845 pxa_free_dma(pcdev->dma_chans[1]);
1846 exit_free_dma_y:
1847 pxa_free_dma(pcdev->dma_chans[0]);
1848 return err;
1849 }
1850
pxa_camera_remove(struct platform_device * pdev)1851 static int pxa_camera_remove(struct platform_device *pdev)
1852 {
1853 struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
1854 struct pxa_camera_dev *pcdev = container_of(soc_host,
1855 struct pxa_camera_dev, soc_host);
1856
1857 pxa_free_dma(pcdev->dma_chans[0]);
1858 pxa_free_dma(pcdev->dma_chans[1]);
1859 pxa_free_dma(pcdev->dma_chans[2]);
1860
1861 soc_camera_host_unregister(soc_host);
1862
1863 dev_info(&pdev->dev, "PXA Camera driver unloaded\n");
1864
1865 return 0;
1866 }
1867
1868 static const struct dev_pm_ops pxa_camera_pm = {
1869 .suspend = pxa_camera_suspend,
1870 .resume = pxa_camera_resume,
1871 };
1872
1873 static const struct of_device_id pxa_camera_of_match[] = {
1874 { .compatible = "marvell,pxa270-qci", },
1875 {},
1876 };
1877 MODULE_DEVICE_TABLE(of, pxa_camera_of_match);
1878
1879 static struct platform_driver pxa_camera_driver = {
1880 .driver = {
1881 .name = PXA_CAM_DRV_NAME,
1882 .pm = &pxa_camera_pm,
1883 .of_match_table = of_match_ptr(pxa_camera_of_match),
1884 },
1885 .probe = pxa_camera_probe,
1886 .remove = pxa_camera_remove,
1887 };
1888
1889 module_platform_driver(pxa_camera_driver);
1890
1891 MODULE_DESCRIPTION("PXA27x SoC Camera Host driver");
1892 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
1893 MODULE_LICENSE("GPL");
1894 MODULE_VERSION(PXA_CAM_VERSION);
1895 MODULE_ALIAS("platform:" PXA_CAM_DRV_NAME);
1896