Version:  2.0.40 2.2.26 2.4.37 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19

Linux/drivers/media/platform/soc_camera/mx2_camera.c

  1 /*
  2  * V4L2 Driver for i.MX27 camera host
  3  *
  4  * Copyright (C) 2008, Sascha Hauer, Pengutronix
  5  * Copyright (C) 2010, Baruch Siach, Orex Computed Radiography
  6  * Copyright (C) 2012, Javier Martin, Vista Silicon S.L.
  7  *
  8  * This program is free software; you can redistribute it and/or modify
  9  * it under the terms of the GNU General Public License as published by
 10  * the Free Software Foundation; either version 2 of the License, or
 11  * (at your option) any later version.
 12  */
 13 
 14 #include <linux/init.h>
 15 #include <linux/module.h>
 16 #include <linux/io.h>
 17 #include <linux/delay.h>
 18 #include <linux/slab.h>
 19 #include <linux/dma-mapping.h>
 20 #include <linux/errno.h>
 21 #include <linux/fs.h>
 22 #include <linux/gcd.h>
 23 #include <linux/interrupt.h>
 24 #include <linux/kernel.h>
 25 #include <linux/math64.h>
 26 #include <linux/mm.h>
 27 #include <linux/moduleparam.h>
 28 #include <linux/time.h>
 29 #include <linux/device.h>
 30 #include <linux/platform_device.h>
 31 #include <linux/clk.h>
 32 
 33 #include <media/v4l2-common.h>
 34 #include <media/v4l2-dev.h>
 35 #include <media/videobuf2-core.h>
 36 #include <media/videobuf2-dma-contig.h>
 37 #include <media/soc_camera.h>
 38 #include <media/soc_mediabus.h>
 39 
 40 #include <linux/videodev2.h>
 41 
 42 #include <linux/platform_data/camera-mx2.h>
 43 
 44 #include <asm/dma.h>
 45 
 46 #define MX2_CAM_DRV_NAME "mx2-camera"
 47 #define MX2_CAM_VERSION "0.0.6"
 48 #define MX2_CAM_DRIVER_DESCRIPTION "i.MX2x_Camera"
 49 
 50 /* reset values */
 51 #define CSICR1_RESET_VAL        0x40000800
 52 #define CSICR2_RESET_VAL        0x0
 53 #define CSICR3_RESET_VAL        0x0
 54 
 55 /* csi control reg 1 */
 56 #define CSICR1_SWAP16_EN        (1 << 31)
 57 #define CSICR1_EXT_VSYNC        (1 << 30)
 58 #define CSICR1_EOF_INTEN        (1 << 29)
 59 #define CSICR1_PRP_IF_EN        (1 << 28)
 60 #define CSICR1_CCIR_MODE        (1 << 27)
 61 #define CSICR1_COF_INTEN        (1 << 26)
 62 #define CSICR1_SF_OR_INTEN      (1 << 25)
 63 #define CSICR1_RF_OR_INTEN      (1 << 24)
 64 #define CSICR1_STATFF_LEVEL     (3 << 22)
 65 #define CSICR1_STATFF_INTEN     (1 << 21)
 66 #define CSICR1_RXFF_LEVEL(l)    (((l) & 3) << 19)
 67 #define CSICR1_RXFF_INTEN       (1 << 18)
 68 #define CSICR1_SOF_POL          (1 << 17)
 69 #define CSICR1_SOF_INTEN        (1 << 16)
 70 #define CSICR1_MCLKDIV(d)       (((d) & 0xF) << 12)
 71 #define CSICR1_HSYNC_POL        (1 << 11)
 72 #define CSICR1_CCIR_EN          (1 << 10)
 73 #define CSICR1_MCLKEN           (1 << 9)
 74 #define CSICR1_FCC              (1 << 8)
 75 #define CSICR1_PACK_DIR         (1 << 7)
 76 #define CSICR1_CLR_STATFIFO     (1 << 6)
 77 #define CSICR1_CLR_RXFIFO       (1 << 5)
 78 #define CSICR1_GCLK_MODE        (1 << 4)
 79 #define CSICR1_INV_DATA         (1 << 3)
 80 #define CSICR1_INV_PCLK         (1 << 2)
 81 #define CSICR1_REDGE            (1 << 1)
 82 #define CSICR1_FMT_MASK         (CSICR1_PACK_DIR | CSICR1_SWAP16_EN)
 83 
 84 #define SHIFT_STATFF_LEVEL      22
 85 #define SHIFT_RXFF_LEVEL        19
 86 #define SHIFT_MCLKDIV           12
 87 
 88 #define SHIFT_FRMCNT            16
 89 
 90 #define CSICR1                  0x00
 91 #define CSICR2                  0x04
 92 #define CSISR                   0x08
 93 #define CSISTATFIFO             0x0c
 94 #define CSIRFIFO                0x10
 95 #define CSIRXCNT                0x14
 96 #define CSICR3                  0x1c
 97 #define CSIDMASA_STATFIFO       0x20
 98 #define CSIDMATA_STATFIFO       0x24
 99 #define CSIDMASA_FB1            0x28
100 #define CSIDMASA_FB2            0x2c
101 #define CSIFBUF_PARA            0x30
102 #define CSIIMAG_PARA            0x34
103 
104 /* EMMA PrP */
105 #define PRP_CNTL                        0x00
106 #define PRP_INTR_CNTL                   0x04
107 #define PRP_INTRSTATUS                  0x08
108 #define PRP_SOURCE_Y_PTR                0x0c
109 #define PRP_SOURCE_CB_PTR               0x10
110 #define PRP_SOURCE_CR_PTR               0x14
111 #define PRP_DEST_RGB1_PTR               0x18
112 #define PRP_DEST_RGB2_PTR               0x1c
113 #define PRP_DEST_Y_PTR                  0x20
114 #define PRP_DEST_CB_PTR                 0x24
115 #define PRP_DEST_CR_PTR                 0x28
116 #define PRP_SRC_FRAME_SIZE              0x2c
117 #define PRP_DEST_CH1_LINE_STRIDE        0x30
118 #define PRP_SRC_PIXEL_FORMAT_CNTL       0x34
119 #define PRP_CH1_PIXEL_FORMAT_CNTL       0x38
120 #define PRP_CH1_OUT_IMAGE_SIZE          0x3c
121 #define PRP_CH2_OUT_IMAGE_SIZE          0x40
122 #define PRP_SRC_LINE_STRIDE             0x44
123 #define PRP_CSC_COEF_012                0x48
124 #define PRP_CSC_COEF_345                0x4c
125 #define PRP_CSC_COEF_678                0x50
126 #define PRP_CH1_RZ_HORI_COEF1           0x54
127 #define PRP_CH1_RZ_HORI_COEF2           0x58
128 #define PRP_CH1_RZ_HORI_VALID           0x5c
129 #define PRP_CH1_RZ_VERT_COEF1           0x60
130 #define PRP_CH1_RZ_VERT_COEF2           0x64
131 #define PRP_CH1_RZ_VERT_VALID           0x68
132 #define PRP_CH2_RZ_HORI_COEF1           0x6c
133 #define PRP_CH2_RZ_HORI_COEF2           0x70
134 #define PRP_CH2_RZ_HORI_VALID           0x74
135 #define PRP_CH2_RZ_VERT_COEF1           0x78
136 #define PRP_CH2_RZ_VERT_COEF2           0x7c
137 #define PRP_CH2_RZ_VERT_VALID           0x80
138 
139 #define PRP_CNTL_CH1EN          (1 << 0)
140 #define PRP_CNTL_CH2EN          (1 << 1)
141 #define PRP_CNTL_CSIEN          (1 << 2)
142 #define PRP_CNTL_DATA_IN_YUV420 (0 << 3)
143 #define PRP_CNTL_DATA_IN_YUV422 (1 << 3)
144 #define PRP_CNTL_DATA_IN_RGB16  (2 << 3)
145 #define PRP_CNTL_DATA_IN_RGB32  (3 << 3)
146 #define PRP_CNTL_CH1_OUT_RGB8   (0 << 5)
147 #define PRP_CNTL_CH1_OUT_RGB16  (1 << 5)
148 #define PRP_CNTL_CH1_OUT_RGB32  (2 << 5)
149 #define PRP_CNTL_CH1_OUT_YUV422 (3 << 5)
150 #define PRP_CNTL_CH2_OUT_YUV420 (0 << 7)
151 #define PRP_CNTL_CH2_OUT_YUV422 (1 << 7)
152 #define PRP_CNTL_CH2_OUT_YUV444 (2 << 7)
153 #define PRP_CNTL_CH1_LEN        (1 << 9)
154 #define PRP_CNTL_CH2_LEN        (1 << 10)
155 #define PRP_CNTL_SKIP_FRAME     (1 << 11)
156 #define PRP_CNTL_SWRST          (1 << 12)
157 #define PRP_CNTL_CLKEN          (1 << 13)
158 #define PRP_CNTL_WEN            (1 << 14)
159 #define PRP_CNTL_CH1BYP         (1 << 15)
160 #define PRP_CNTL_IN_TSKIP(x)    ((x) << 16)
161 #define PRP_CNTL_CH1_TSKIP(x)   ((x) << 19)
162 #define PRP_CNTL_CH2_TSKIP(x)   ((x) << 22)
163 #define PRP_CNTL_INPUT_FIFO_LEVEL(x)    ((x) << 25)
164 #define PRP_CNTL_RZ_FIFO_LEVEL(x)       ((x) << 27)
165 #define PRP_CNTL_CH2B1EN        (1 << 29)
166 #define PRP_CNTL_CH2B2EN        (1 << 30)
167 #define PRP_CNTL_CH2FEN         (1 << 31)
168 
169 /* IRQ Enable and status register */
170 #define PRP_INTR_RDERR          (1 << 0)
171 #define PRP_INTR_CH1WERR        (1 << 1)
172 #define PRP_INTR_CH2WERR        (1 << 2)
173 #define PRP_INTR_CH1FC          (1 << 3)
174 #define PRP_INTR_CH2FC          (1 << 5)
175 #define PRP_INTR_LBOVF          (1 << 7)
176 #define PRP_INTR_CH2OVF         (1 << 8)
177 
178 /* Resizing registers */
179 #define PRP_RZ_VALID_TBL_LEN(x) ((x) << 24)
180 #define PRP_RZ_VALID_BILINEAR   (1 << 31)
181 
182 #define MAX_VIDEO_MEM   16
183 
184 #define RESIZE_NUM_MIN  1
185 #define RESIZE_NUM_MAX  20
186 #define BC_COEF         3
187 #define SZ_COEF         (1 << BC_COEF)
188 
189 #define RESIZE_DIR_H    0
190 #define RESIZE_DIR_V    1
191 
192 #define RESIZE_ALGO_BILINEAR 0
193 #define RESIZE_ALGO_AVERAGING 1
194 
195 struct mx2_prp_cfg {
196         int channel;
197         u32 in_fmt;
198         u32 out_fmt;
199         u32 src_pixel;
200         u32 ch1_pixel;
201         u32 irq_flags;
202         u32 csicr1;
203 };
204 
205 /* prp resizing parameters */
206 struct emma_prp_resize {
207         int             algo; /* type of algorithm used */
208         int             len; /* number of coefficients */
209         unsigned char   s[RESIZE_NUM_MAX]; /* table of coefficients */
210 };
211 
212 /* prp configuration for a client-host fmt pair */
213 struct mx2_fmt_cfg {
214         u32     in_fmt;
215         u32                             out_fmt;
216         struct mx2_prp_cfg              cfg;
217 };
218 
219 struct mx2_buf_internal {
220         struct list_head        queue;
221         int                     bufnum;
222         bool                    discard;
223 };
224 
225 /* buffer for one video frame */
226 struct mx2_buffer {
227         /* common v4l buffer stuff -- must be first */
228         struct vb2_buffer               vb;
229         struct mx2_buf_internal         internal;
230 };
231 
232 enum mx2_camera_type {
233         IMX27_CAMERA,
234 };
235 
236 struct mx2_camera_dev {
237         struct device           *dev;
238         struct soc_camera_host  soc_host;
239         struct clk              *clk_emma_ahb, *clk_emma_ipg;
240         struct clk              *clk_csi_ahb, *clk_csi_per;
241 
242         void __iomem            *base_csi, *base_emma;
243 
244         struct mx2_camera_platform_data *pdata;
245         unsigned long           platform_flags;
246 
247         struct list_head        capture;
248         struct list_head        active_bufs;
249         struct list_head        discard;
250 
251         spinlock_t              lock;
252 
253         int                     dma;
254         struct mx2_buffer       *active;
255         struct mx2_buffer       *fb1_active;
256         struct mx2_buffer       *fb2_active;
257 
258         u32                     csicr1;
259         enum mx2_camera_type    devtype;
260 
261         struct mx2_buf_internal buf_discard[2];
262         void                    *discard_buffer;
263         dma_addr_t              discard_buffer_dma;
264         size_t                  discard_size;
265         struct mx2_fmt_cfg      *emma_prp;
266         struct emma_prp_resize  resizing[2];
267         unsigned int            s_width, s_height;
268         u32                     frame_count;
269         struct vb2_alloc_ctx    *alloc_ctx;
270 };
271 
272 static struct platform_device_id mx2_camera_devtype[] = {
273         {
274                 .name = "imx27-camera",
275                 .driver_data = IMX27_CAMERA,
276         }, {
277                 /* sentinel */
278         }
279 };
280 MODULE_DEVICE_TABLE(platform, mx2_camera_devtype);
281 
282 static struct mx2_buffer *mx2_ibuf_to_buf(struct mx2_buf_internal *int_buf)
283 {
284         return container_of(int_buf, struct mx2_buffer, internal);
285 }
286 
287 static struct mx2_fmt_cfg mx27_emma_prp_table[] = {
288         /*
289          * This is a generic configuration which is valid for most
290          * prp input-output format combinations.
291          * We set the incoming and outgoing pixelformat to a
292          * 16 Bit wide format and adjust the bytesperline
293          * accordingly. With this configuration the inputdata
294          * will not be changed by the emma and could be any type
295          * of 16 Bit Pixelformat.
296          */
297         {
298                 .in_fmt         = 0,
299                 .out_fmt        = 0,
300                 .cfg            = {
301                         .channel        = 1,
302                         .in_fmt         = PRP_CNTL_DATA_IN_RGB16,
303                         .out_fmt        = PRP_CNTL_CH1_OUT_RGB16,
304                         .src_pixel      = 0x2ca00565, /* RGB565 */
305                         .ch1_pixel      = 0x2ca00565, /* RGB565 */
306                         .irq_flags      = PRP_INTR_RDERR | PRP_INTR_CH1WERR |
307                                                 PRP_INTR_CH1FC | PRP_INTR_LBOVF,
308                         .csicr1         = 0,
309                 }
310         },
311         {
312                 .in_fmt         = MEDIA_BUS_FMT_UYVY8_2X8,
313                 .out_fmt        = V4L2_PIX_FMT_YUYV,
314                 .cfg            = {
315                         .channel        = 1,
316                         .in_fmt         = PRP_CNTL_DATA_IN_YUV422,
317                         .out_fmt        = PRP_CNTL_CH1_OUT_YUV422,
318                         .src_pixel      = 0x22000888, /* YUV422 (YUYV) */
319                         .ch1_pixel      = 0x62000888, /* YUV422 (YUYV) */
320                         .irq_flags      = PRP_INTR_RDERR | PRP_INTR_CH1WERR |
321                                                 PRP_INTR_CH1FC | PRP_INTR_LBOVF,
322                         .csicr1         = CSICR1_SWAP16_EN,
323                 }
324         },
325         {
326                 .in_fmt         = MEDIA_BUS_FMT_YUYV8_2X8,
327                 .out_fmt        = V4L2_PIX_FMT_YUYV,
328                 .cfg            = {
329                         .channel        = 1,
330                         .in_fmt         = PRP_CNTL_DATA_IN_YUV422,
331                         .out_fmt        = PRP_CNTL_CH1_OUT_YUV422,
332                         .src_pixel      = 0x22000888, /* YUV422 (YUYV) */
333                         .ch1_pixel      = 0x62000888, /* YUV422 (YUYV) */
334                         .irq_flags      = PRP_INTR_RDERR | PRP_INTR_CH1WERR |
335                                                 PRP_INTR_CH1FC | PRP_INTR_LBOVF,
336                         .csicr1         = CSICR1_PACK_DIR,
337                 }
338         },
339         {
340                 .in_fmt         = MEDIA_BUS_FMT_YUYV8_2X8,
341                 .out_fmt        = V4L2_PIX_FMT_YUV420,
342                 .cfg            = {
343                         .channel        = 2,
344                         .in_fmt         = PRP_CNTL_DATA_IN_YUV422,
345                         .out_fmt        = PRP_CNTL_CH2_OUT_YUV420,
346                         .src_pixel      = 0x22000888, /* YUV422 (YUYV) */
347                         .irq_flags      = PRP_INTR_RDERR | PRP_INTR_CH2WERR |
348                                         PRP_INTR_CH2FC | PRP_INTR_LBOVF |
349                                         PRP_INTR_CH2OVF,
350                         .csicr1         = CSICR1_PACK_DIR,
351                 }
352         },
353         {
354                 .in_fmt         = MEDIA_BUS_FMT_UYVY8_2X8,
355                 .out_fmt        = V4L2_PIX_FMT_YUV420,
356                 .cfg            = {
357                         .channel        = 2,
358                         .in_fmt         = PRP_CNTL_DATA_IN_YUV422,
359                         .out_fmt        = PRP_CNTL_CH2_OUT_YUV420,
360                         .src_pixel      = 0x22000888, /* YUV422 (YUYV) */
361                         .irq_flags      = PRP_INTR_RDERR | PRP_INTR_CH2WERR |
362                                         PRP_INTR_CH2FC | PRP_INTR_LBOVF |
363                                         PRP_INTR_CH2OVF,
364                         .csicr1         = CSICR1_SWAP16_EN,
365                 }
366         },
367 };
368 
369 static struct mx2_fmt_cfg *mx27_emma_prp_get_format(u32 in_fmt, u32 out_fmt)
370 {
371         int i;
372 
373         for (i = 1; i < ARRAY_SIZE(mx27_emma_prp_table); i++)
374                 if ((mx27_emma_prp_table[i].in_fmt == in_fmt) &&
375                                 (mx27_emma_prp_table[i].out_fmt == out_fmt)) {
376                         return &mx27_emma_prp_table[i];
377                 }
378         /* If no match return the most generic configuration */
379         return &mx27_emma_prp_table[0];
380 };
381 
382 static void mx27_update_emma_buf(struct mx2_camera_dev *pcdev,
383                                  unsigned long phys, int bufnum)
384 {
385         struct mx2_fmt_cfg *prp = pcdev->emma_prp;
386 
387         if (prp->cfg.channel == 1) {
388                 writel(phys, pcdev->base_emma +
389                                 PRP_DEST_RGB1_PTR + 4 * bufnum);
390         } else {
391                 writel(phys, pcdev->base_emma +
392                         PRP_DEST_Y_PTR - 0x14 * bufnum);
393                 if (prp->out_fmt == V4L2_PIX_FMT_YUV420) {
394                         u32 imgsize = pcdev->soc_host.icd->user_height *
395                                         pcdev->soc_host.icd->user_width;
396 
397                         writel(phys + imgsize, pcdev->base_emma +
398                                 PRP_DEST_CB_PTR - 0x14 * bufnum);
399                         writel(phys + ((5 * imgsize) / 4), pcdev->base_emma +
400                                 PRP_DEST_CR_PTR - 0x14 * bufnum);
401                 }
402         }
403 }
404 
405 static void mx2_camera_deactivate(struct mx2_camera_dev *pcdev)
406 {
407         clk_disable_unprepare(pcdev->clk_csi_ahb);
408         clk_disable_unprepare(pcdev->clk_csi_per);
409         writel(0, pcdev->base_csi + CSICR1);
410         writel(0, pcdev->base_emma + PRP_CNTL);
411 }
412 
413 static int mx2_camera_add_device(struct soc_camera_device *icd)
414 {
415         dev_info(icd->parent, "Camera driver attached to camera %d\n",
416                  icd->devnum);
417 
418         return 0;
419 }
420 
421 static void mx2_camera_remove_device(struct soc_camera_device *icd)
422 {
423         dev_info(icd->parent, "Camera driver detached from camera %d\n",
424                  icd->devnum);
425 }
426 
427 /*
428  * The following two functions absolutely depend on the fact, that
429  * there can be only one camera on mx2 camera sensor interface
430  */
431 static int mx2_camera_clock_start(struct soc_camera_host *ici)
432 {
433         struct mx2_camera_dev *pcdev = ici->priv;
434         int ret;
435         u32 csicr1;
436 
437         ret = clk_prepare_enable(pcdev->clk_csi_ahb);
438         if (ret < 0)
439                 return ret;
440 
441         ret = clk_prepare_enable(pcdev->clk_csi_per);
442         if (ret < 0)
443                 goto exit_csi_ahb;
444 
445         csicr1 = CSICR1_MCLKEN | CSICR1_PRP_IF_EN | CSICR1_FCC |
446                 CSICR1_RXFF_LEVEL(0);
447 
448         pcdev->csicr1 = csicr1;
449         writel(pcdev->csicr1, pcdev->base_csi + CSICR1);
450 
451         pcdev->frame_count = 0;
452 
453         return 0;
454 
455 exit_csi_ahb:
456         clk_disable_unprepare(pcdev->clk_csi_ahb);
457 
458         return ret;
459 }
460 
461 static void mx2_camera_clock_stop(struct soc_camera_host *ici)
462 {
463         struct mx2_camera_dev *pcdev = ici->priv;
464 
465         mx2_camera_deactivate(pcdev);
466 }
467 
468 /*
469  *  Videobuf operations
470  */
471 static int mx2_videobuf_setup(struct vb2_queue *vq,
472                         const struct v4l2_format *fmt,
473                         unsigned int *count, unsigned int *num_planes,
474                         unsigned int sizes[], void *alloc_ctxs[])
475 {
476         struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
477         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
478         struct mx2_camera_dev *pcdev = ici->priv;
479 
480         dev_dbg(icd->parent, "count=%d, size=%d\n", *count, sizes[0]);
481 
482         /* TODO: support for VIDIOC_CREATE_BUFS not ready */
483         if (fmt != NULL)
484                 return -ENOTTY;
485 
486         alloc_ctxs[0] = pcdev->alloc_ctx;
487 
488         sizes[0] = icd->sizeimage;
489 
490         if (0 == *count)
491                 *count = 32;
492         if (!*num_planes &&
493             sizes[0] * *count > MAX_VIDEO_MEM * 1024 * 1024)
494                 *count = (MAX_VIDEO_MEM * 1024 * 1024) / sizes[0];
495 
496         *num_planes = 1;
497 
498         return 0;
499 }
500 
501 static int mx2_videobuf_prepare(struct vb2_buffer *vb)
502 {
503         struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
504         int ret = 0;
505 
506         dev_dbg(icd->parent, "%s (vb=0x%p) 0x%p %lu\n", __func__,
507                 vb, vb2_plane_vaddr(vb, 0), vb2_get_plane_payload(vb, 0));
508 
509 #ifdef DEBUG
510         /*
511          * This can be useful if you want to see if we actually fill
512          * the buffer with something
513          */
514         memset((void *)vb2_plane_vaddr(vb, 0),
515                0xaa, vb2_get_plane_payload(vb, 0));
516 #endif
517 
518         vb2_set_plane_payload(vb, 0, icd->sizeimage);
519         if (vb2_plane_vaddr(vb, 0) &&
520             vb2_get_plane_payload(vb, 0) > vb2_plane_size(vb, 0)) {
521                 ret = -EINVAL;
522                 goto out;
523         }
524 
525         return 0;
526 
527 out:
528         return ret;
529 }
530 
531 static void mx2_videobuf_queue(struct vb2_buffer *vb)
532 {
533         struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
534         struct soc_camera_host *ici =
535                 to_soc_camera_host(icd->parent);
536         struct mx2_camera_dev *pcdev = ici->priv;
537         struct mx2_buffer *buf = container_of(vb, struct mx2_buffer, vb);
538         unsigned long flags;
539 
540         dev_dbg(icd->parent, "%s (vb=0x%p) 0x%p %lu\n", __func__,
541                 vb, vb2_plane_vaddr(vb, 0), vb2_get_plane_payload(vb, 0));
542 
543         spin_lock_irqsave(&pcdev->lock, flags);
544 
545         list_add_tail(&buf->internal.queue, &pcdev->capture);
546 
547         spin_unlock_irqrestore(&pcdev->lock, flags);
548 }
549 
550 static void mx27_camera_emma_buf_init(struct soc_camera_device *icd,
551                 int bytesperline)
552 {
553         struct soc_camera_host *ici =
554                 to_soc_camera_host(icd->parent);
555         struct mx2_camera_dev *pcdev = ici->priv;
556         struct mx2_fmt_cfg *prp = pcdev->emma_prp;
557 
558         writel((pcdev->s_width << 16) | pcdev->s_height,
559                pcdev->base_emma + PRP_SRC_FRAME_SIZE);
560         writel(prp->cfg.src_pixel,
561                pcdev->base_emma + PRP_SRC_PIXEL_FORMAT_CNTL);
562         if (prp->cfg.channel == 1) {
563                 writel((icd->user_width << 16) | icd->user_height,
564                         pcdev->base_emma + PRP_CH1_OUT_IMAGE_SIZE);
565                 writel(bytesperline,
566                         pcdev->base_emma + PRP_DEST_CH1_LINE_STRIDE);
567                 writel(prp->cfg.ch1_pixel,
568                         pcdev->base_emma + PRP_CH1_PIXEL_FORMAT_CNTL);
569         } else { /* channel 2 */
570                 writel((icd->user_width << 16) | icd->user_height,
571                         pcdev->base_emma + PRP_CH2_OUT_IMAGE_SIZE);
572         }
573 
574         /* Enable interrupts */
575         writel(prp->cfg.irq_flags, pcdev->base_emma + PRP_INTR_CNTL);
576 }
577 
578 static void mx2_prp_resize_commit(struct mx2_camera_dev *pcdev)
579 {
580         int dir;
581 
582         for (dir = RESIZE_DIR_H; dir <= RESIZE_DIR_V; dir++) {
583                 unsigned char *s = pcdev->resizing[dir].s;
584                 int len = pcdev->resizing[dir].len;
585                 unsigned int coeff[2] = {0, 0};
586                 unsigned int valid  = 0;
587                 int i;
588 
589                 if (len == 0)
590                         continue;
591 
592                 for (i = RESIZE_NUM_MAX - 1; i >= 0; i--) {
593                         int j;
594 
595                         j = i > 9 ? 1 : 0;
596                         coeff[j] = (coeff[j] << BC_COEF) |
597                                         (s[i] & (SZ_COEF - 1));
598 
599                         if (i == 5 || i == 15)
600                                 coeff[j] <<= 1;
601 
602                         valid = (valid << 1) | (s[i] >> BC_COEF);
603                 }
604 
605                 valid |= PRP_RZ_VALID_TBL_LEN(len);
606 
607                 if (pcdev->resizing[dir].algo == RESIZE_ALGO_BILINEAR)
608                         valid |= PRP_RZ_VALID_BILINEAR;
609 
610                 if (pcdev->emma_prp->cfg.channel == 1) {
611                         if (dir == RESIZE_DIR_H) {
612                                 writel(coeff[0], pcdev->base_emma +
613                                                         PRP_CH1_RZ_HORI_COEF1);
614                                 writel(coeff[1], pcdev->base_emma +
615                                                         PRP_CH1_RZ_HORI_COEF2);
616                                 writel(valid, pcdev->base_emma +
617                                                         PRP_CH1_RZ_HORI_VALID);
618                         } else {
619                                 writel(coeff[0], pcdev->base_emma +
620                                                         PRP_CH1_RZ_VERT_COEF1);
621                                 writel(coeff[1], pcdev->base_emma +
622                                                         PRP_CH1_RZ_VERT_COEF2);
623                                 writel(valid, pcdev->base_emma +
624                                                         PRP_CH1_RZ_VERT_VALID);
625                         }
626                 } else {
627                         if (dir == RESIZE_DIR_H) {
628                                 writel(coeff[0], pcdev->base_emma +
629                                                         PRP_CH2_RZ_HORI_COEF1);
630                                 writel(coeff[1], pcdev->base_emma +
631                                                         PRP_CH2_RZ_HORI_COEF2);
632                                 writel(valid, pcdev->base_emma +
633                                                         PRP_CH2_RZ_HORI_VALID);
634                         } else {
635                                 writel(coeff[0], pcdev->base_emma +
636                                                         PRP_CH2_RZ_VERT_COEF1);
637                                 writel(coeff[1], pcdev->base_emma +
638                                                         PRP_CH2_RZ_VERT_COEF2);
639                                 writel(valid, pcdev->base_emma +
640                                                         PRP_CH2_RZ_VERT_VALID);
641                         }
642                 }
643         }
644 }
645 
646 static int mx2_start_streaming(struct vb2_queue *q, unsigned int count)
647 {
648         struct soc_camera_device *icd = soc_camera_from_vb2q(q);
649         struct soc_camera_host *ici =
650                 to_soc_camera_host(icd->parent);
651         struct mx2_camera_dev *pcdev = ici->priv;
652         struct mx2_fmt_cfg *prp = pcdev->emma_prp;
653         struct vb2_buffer *vb;
654         struct mx2_buffer *buf;
655         unsigned long phys;
656         int bytesperline;
657         unsigned long flags;
658 
659         if (count < 2)
660                 return -ENOBUFS;
661 
662         spin_lock_irqsave(&pcdev->lock, flags);
663 
664         buf = list_first_entry(&pcdev->capture, struct mx2_buffer,
665                                internal.queue);
666         buf->internal.bufnum = 0;
667         vb = &buf->vb;
668 
669         phys = vb2_dma_contig_plane_dma_addr(vb, 0);
670         mx27_update_emma_buf(pcdev, phys, buf->internal.bufnum);
671         list_move_tail(pcdev->capture.next, &pcdev->active_bufs);
672 
673         buf = list_first_entry(&pcdev->capture, struct mx2_buffer,
674                                internal.queue);
675         buf->internal.bufnum = 1;
676         vb = &buf->vb;
677 
678         phys = vb2_dma_contig_plane_dma_addr(vb, 0);
679         mx27_update_emma_buf(pcdev, phys, buf->internal.bufnum);
680         list_move_tail(pcdev->capture.next, &pcdev->active_bufs);
681 
682         bytesperline = soc_mbus_bytes_per_line(icd->user_width,
683                                                icd->current_fmt->host_fmt);
684         if (bytesperline < 0) {
685                 spin_unlock_irqrestore(&pcdev->lock, flags);
686                 return bytesperline;
687         }
688 
689         /*
690          * I didn't manage to properly enable/disable the prp
691          * on a per frame basis during running transfers,
692          * thus we allocate a buffer here and use it to
693          * discard frames when no buffer is available.
694          * Feel free to work on this ;)
695          */
696         pcdev->discard_size = icd->user_height * bytesperline;
697         pcdev->discard_buffer = dma_alloc_coherent(ici->v4l2_dev.dev,
698                                         pcdev->discard_size,
699                                         &pcdev->discard_buffer_dma, GFP_ATOMIC);
700         if (!pcdev->discard_buffer) {
701                 spin_unlock_irqrestore(&pcdev->lock, flags);
702                 return -ENOMEM;
703         }
704 
705         pcdev->buf_discard[0].discard = true;
706         list_add_tail(&pcdev->buf_discard[0].queue,
707                       &pcdev->discard);
708 
709         pcdev->buf_discard[1].discard = true;
710         list_add_tail(&pcdev->buf_discard[1].queue,
711                       &pcdev->discard);
712 
713         mx2_prp_resize_commit(pcdev);
714 
715         mx27_camera_emma_buf_init(icd, bytesperline);
716 
717         if (prp->cfg.channel == 1) {
718                 writel(PRP_CNTL_CH1EN |
719                        PRP_CNTL_CSIEN |
720                        prp->cfg.in_fmt |
721                        prp->cfg.out_fmt |
722                        PRP_CNTL_CH1_LEN |
723                        PRP_CNTL_CH1BYP |
724                        PRP_CNTL_CH1_TSKIP(0) |
725                        PRP_CNTL_IN_TSKIP(0),
726                        pcdev->base_emma + PRP_CNTL);
727         } else {
728                 writel(PRP_CNTL_CH2EN |
729                        PRP_CNTL_CSIEN |
730                        prp->cfg.in_fmt |
731                        prp->cfg.out_fmt |
732                        PRP_CNTL_CH2_LEN |
733                        PRP_CNTL_CH2_TSKIP(0) |
734                        PRP_CNTL_IN_TSKIP(0),
735                        pcdev->base_emma + PRP_CNTL);
736         }
737         spin_unlock_irqrestore(&pcdev->lock, flags);
738 
739         return 0;
740 }
741 
742 static void mx2_stop_streaming(struct vb2_queue *q)
743 {
744         struct soc_camera_device *icd = soc_camera_from_vb2q(q);
745         struct soc_camera_host *ici =
746                 to_soc_camera_host(icd->parent);
747         struct mx2_camera_dev *pcdev = ici->priv;
748         struct mx2_fmt_cfg *prp = pcdev->emma_prp;
749         unsigned long flags;
750         void *b;
751         u32 cntl;
752 
753         spin_lock_irqsave(&pcdev->lock, flags);
754 
755         cntl = readl(pcdev->base_emma + PRP_CNTL);
756         if (prp->cfg.channel == 1) {
757                 writel(cntl & ~PRP_CNTL_CH1EN,
758                        pcdev->base_emma + PRP_CNTL);
759         } else {
760                 writel(cntl & ~PRP_CNTL_CH2EN,
761                        pcdev->base_emma + PRP_CNTL);
762         }
763         INIT_LIST_HEAD(&pcdev->capture);
764         INIT_LIST_HEAD(&pcdev->active_bufs);
765         INIT_LIST_HEAD(&pcdev->discard);
766 
767         b = pcdev->discard_buffer;
768         pcdev->discard_buffer = NULL;
769 
770         spin_unlock_irqrestore(&pcdev->lock, flags);
771 
772         dma_free_coherent(ici->v4l2_dev.dev,
773                           pcdev->discard_size, b, pcdev->discard_buffer_dma);
774 }
775 
776 static struct vb2_ops mx2_videobuf_ops = {
777         .queue_setup     = mx2_videobuf_setup,
778         .buf_prepare     = mx2_videobuf_prepare,
779         .buf_queue       = mx2_videobuf_queue,
780         .start_streaming = mx2_start_streaming,
781         .stop_streaming  = mx2_stop_streaming,
782 };
783 
784 static int mx2_camera_init_videobuf(struct vb2_queue *q,
785                               struct soc_camera_device *icd)
786 {
787         q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
788         q->io_modes = VB2_MMAP | VB2_USERPTR;
789         q->drv_priv = icd;
790         q->ops = &mx2_videobuf_ops;
791         q->mem_ops = &vb2_dma_contig_memops;
792         q->buf_struct_size = sizeof(struct mx2_buffer);
793         q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
794 
795         return vb2_queue_init(q);
796 }
797 
798 #define MX2_BUS_FLAGS   (V4L2_MBUS_MASTER | \
799                         V4L2_MBUS_VSYNC_ACTIVE_HIGH | \
800                         V4L2_MBUS_VSYNC_ACTIVE_LOW | \
801                         V4L2_MBUS_HSYNC_ACTIVE_HIGH | \
802                         V4L2_MBUS_HSYNC_ACTIVE_LOW | \
803                         V4L2_MBUS_PCLK_SAMPLE_RISING | \
804                         V4L2_MBUS_PCLK_SAMPLE_FALLING | \
805                         V4L2_MBUS_DATA_ACTIVE_HIGH | \
806                         V4L2_MBUS_DATA_ACTIVE_LOW)
807 
808 static int mx27_camera_emma_prp_reset(struct mx2_camera_dev *pcdev)
809 {
810         int count = 0;
811 
812         readl(pcdev->base_emma + PRP_CNTL);
813         writel(PRP_CNTL_SWRST, pcdev->base_emma + PRP_CNTL);
814         while (count++ < 100) {
815                 if (!(readl(pcdev->base_emma + PRP_CNTL) & PRP_CNTL_SWRST))
816                         return 0;
817                 barrier();
818                 udelay(1);
819         }
820 
821         return -ETIMEDOUT;
822 }
823 
824 static int mx2_camera_set_bus_param(struct soc_camera_device *icd)
825 {
826         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
827         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
828         struct mx2_camera_dev *pcdev = ici->priv;
829         struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
830         unsigned long common_flags;
831         int ret;
832         int bytesperline;
833         u32 csicr1 = pcdev->csicr1;
834 
835         ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
836         if (!ret) {
837                 common_flags = soc_mbus_config_compatible(&cfg, MX2_BUS_FLAGS);
838                 if (!common_flags) {
839                         dev_warn(icd->parent,
840                                  "Flags incompatible: camera 0x%x, host 0x%x\n",
841                                  cfg.flags, MX2_BUS_FLAGS);
842                         return -EINVAL;
843                 }
844         } else if (ret != -ENOIOCTLCMD) {
845                 return ret;
846         } else {
847                 common_flags = MX2_BUS_FLAGS;
848         }
849 
850         if ((common_flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH) &&
851             (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)) {
852                 if (pcdev->platform_flags & MX2_CAMERA_HSYNC_HIGH)
853                         common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_LOW;
854                 else
855                         common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_HIGH;
856         }
857 
858         if ((common_flags & V4L2_MBUS_PCLK_SAMPLE_RISING) &&
859             (common_flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)) {
860                 if (pcdev->platform_flags & MX2_CAMERA_PCLK_SAMPLE_RISING)
861                         common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_FALLING;
862                 else
863                         common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_RISING;
864         }
865 
866         cfg.flags = common_flags;
867         ret = v4l2_subdev_call(sd, video, s_mbus_config, &cfg);
868         if (ret < 0 && ret != -ENOIOCTLCMD) {
869                 dev_dbg(icd->parent, "camera s_mbus_config(0x%lx) returned %d\n",
870                         common_flags, ret);
871                 return ret;
872         }
873 
874         csicr1 = (csicr1 & ~CSICR1_FMT_MASK) | pcdev->emma_prp->cfg.csicr1;
875 
876         if (common_flags & V4L2_MBUS_PCLK_SAMPLE_RISING)
877                 csicr1 |= CSICR1_REDGE;
878         if (common_flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH)
879                 csicr1 |= CSICR1_SOF_POL;
880         if (common_flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH)
881                 csicr1 |= CSICR1_HSYNC_POL;
882         if (pcdev->platform_flags & MX2_CAMERA_EXT_VSYNC)
883                 csicr1 |= CSICR1_EXT_VSYNC;
884         if (pcdev->platform_flags & MX2_CAMERA_CCIR)
885                 csicr1 |= CSICR1_CCIR_EN;
886         if (pcdev->platform_flags & MX2_CAMERA_CCIR_INTERLACE)
887                 csicr1 |= CSICR1_CCIR_MODE;
888         if (pcdev->platform_flags & MX2_CAMERA_GATED_CLOCK)
889                 csicr1 |= CSICR1_GCLK_MODE;
890         if (pcdev->platform_flags & MX2_CAMERA_INV_DATA)
891                 csicr1 |= CSICR1_INV_DATA;
892 
893         pcdev->csicr1 = csicr1;
894 
895         bytesperline = soc_mbus_bytes_per_line(icd->user_width,
896                         icd->current_fmt->host_fmt);
897         if (bytesperline < 0)
898                 return bytesperline;
899 
900         ret = mx27_camera_emma_prp_reset(pcdev);
901         if (ret)
902                 return ret;
903 
904         writel(pcdev->csicr1, pcdev->base_csi + CSICR1);
905 
906         return 0;
907 }
908 
909 static int mx2_camera_set_crop(struct soc_camera_device *icd,
910                                 const struct v4l2_crop *a)
911 {
912         struct v4l2_crop a_writable = *a;
913         struct v4l2_rect *rect = &a_writable.c;
914         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
915         struct v4l2_mbus_framefmt mf;
916         int ret;
917 
918         soc_camera_limit_side(&rect->left, &rect->width, 0, 2, 4096);
919         soc_camera_limit_side(&rect->top, &rect->height, 0, 2, 4096);
920 
921         ret = v4l2_subdev_call(sd, video, s_crop, a);
922         if (ret < 0)
923                 return ret;
924 
925         /* The capture device might have changed its output  */
926         ret = v4l2_subdev_call(sd, video, g_mbus_fmt, &mf);
927         if (ret < 0)
928                 return ret;
929 
930         dev_dbg(icd->parent, "Sensor cropped %dx%d\n",
931                 mf.width, mf.height);
932 
933         icd->user_width         = mf.width;
934         icd->user_height        = mf.height;
935 
936         return ret;
937 }
938 
939 static int mx2_camera_get_formats(struct soc_camera_device *icd,
940                                   unsigned int idx,
941                                   struct soc_camera_format_xlate *xlate)
942 {
943         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
944         const struct soc_mbus_pixelfmt *fmt;
945         struct device *dev = icd->parent;
946         u32 code;
947         int ret, formats = 0;
948 
949         ret = v4l2_subdev_call(sd, video, enum_mbus_fmt, idx, &code);
950         if (ret < 0)
951                 /* no more formats */
952                 return 0;
953 
954         fmt = soc_mbus_get_fmtdesc(code);
955         if (!fmt) {
956                 dev_err(dev, "Invalid format code #%u: %d\n", idx, code);
957                 return 0;
958         }
959 
960         if (code == MEDIA_BUS_FMT_YUYV8_2X8 ||
961             code == MEDIA_BUS_FMT_UYVY8_2X8) {
962                 formats++;
963                 if (xlate) {
964                         /*
965                          * CH2 can output YUV420 which is a standard format in
966                          * soc_mediabus.c
967                          */
968                         xlate->host_fmt =
969                                 soc_mbus_get_fmtdesc(MEDIA_BUS_FMT_YUYV8_1_5X8);
970                         xlate->code     = code;
971                         dev_dbg(dev, "Providing host format %s for sensor code %d\n",
972                                xlate->host_fmt->name, code);
973                         xlate++;
974                 }
975         }
976 
977         if (code == MEDIA_BUS_FMT_UYVY8_2X8) {
978                 formats++;
979                 if (xlate) {
980                         xlate->host_fmt =
981                                 soc_mbus_get_fmtdesc(MEDIA_BUS_FMT_YUYV8_2X8);
982                         xlate->code     = code;
983                         dev_dbg(dev, "Providing host format %s for sensor code %d\n",
984                                 xlate->host_fmt->name, code);
985                         xlate++;
986                 }
987         }
988 
989         /* Generic pass-trough */
990         formats++;
991         if (xlate) {
992                 xlate->host_fmt = fmt;
993                 xlate->code     = code;
994                 xlate++;
995         }
996         return formats;
997 }
998 
999 static int mx2_emmaprp_resize(struct mx2_camera_dev *pcdev,
1000                               struct v4l2_mbus_framefmt *mf_in,
1001                               struct v4l2_pix_format *pix_out, bool apply)
1002 {
1003         unsigned int num, den;
1004         unsigned long m;
1005         int i, dir;
1006 
1007         for (dir = RESIZE_DIR_H; dir <= RESIZE_DIR_V; dir++) {
1008                 struct emma_prp_resize tmprsz;
1009                 unsigned char *s = tmprsz.s;
1010                 int len = 0;
1011                 int in, out;
1012 
1013                 if (dir == RESIZE_DIR_H) {
1014                         in = mf_in->width;
1015                         out = pix_out->width;
1016                 } else {
1017                         in = mf_in->height;
1018                         out = pix_out->height;
1019                 }
1020 
1021                 if (in < out)
1022                         return -EINVAL;
1023                 else if (in == out)
1024                         continue;
1025 
1026                 /* Calculate ratio */
1027                 m = gcd(in, out);
1028                 num = in / m;
1029                 den = out / m;
1030                 if (num > RESIZE_NUM_MAX)
1031                         return -EINVAL;
1032 
1033                 if ((num >= 2 * den) && (den == 1) &&
1034                     (num < 9) && (!(num & 0x01))) {
1035                         int sum = 0;
1036                         int j;
1037 
1038                         /* Average scaling for >= 2:1 ratios */
1039                         /* Support can be added for num >=9 and odd values */
1040 
1041                         tmprsz.algo = RESIZE_ALGO_AVERAGING;
1042                         len = num;
1043 
1044                         for (i = 0; i < (len / 2); i++)
1045                                 s[i] = 8;
1046 
1047                         do {
1048                                 for (i = 0; i < (len / 2); i++) {
1049                                         s[i] = s[i] >> 1;
1050                                         sum = 0;
1051                                         for (j = 0; j < (len / 2); j++)
1052                                                 sum += s[j];
1053                                         if (sum == 4)
1054                                                 break;
1055                                 }
1056                         } while (sum != 4);
1057 
1058                         for (i = (len / 2); i < len; i++)
1059                                 s[i] = s[len - i - 1];
1060 
1061                         s[len - 1] |= SZ_COEF;
1062                 } else {
1063                         /* bilinear scaling for < 2:1 ratios */
1064                         int v; /* overflow counter */
1065                         int coeff, nxt; /* table output */
1066                         int in_pos_inc = 2 * den;
1067                         int out_pos = num;
1068                         int out_pos_inc = 2 * num;
1069                         int init_carry = num - den;
1070                         int carry = init_carry;
1071 
1072                         tmprsz.algo = RESIZE_ALGO_BILINEAR;
1073                         v = den + in_pos_inc;
1074                         do {
1075                                 coeff = v - out_pos;
1076                                 out_pos += out_pos_inc;
1077                                 carry += out_pos_inc;
1078                                 for (nxt = 0; v < out_pos; nxt++) {
1079                                         v += in_pos_inc;
1080                                         carry -= in_pos_inc;
1081                                 }
1082 
1083                                 if (len > RESIZE_NUM_MAX)
1084                                         return -EINVAL;
1085 
1086                                 coeff = ((coeff << BC_COEF) +
1087                                         (in_pos_inc >> 1)) / in_pos_inc;
1088 
1089                                 if (coeff >= (SZ_COEF - 1))
1090                                         coeff--;
1091 
1092                                 coeff |= SZ_COEF;
1093                                 s[len] = (unsigned char)coeff;
1094                                 len++;
1095 
1096                                 for (i = 1; i < nxt; i++) {
1097                                         if (len >= RESIZE_NUM_MAX)
1098                                                 return -EINVAL;
1099                                         s[len] = 0;
1100                                         len++;
1101                                 }
1102                         } while (carry != init_carry);
1103                 }
1104                 tmprsz.len = len;
1105                 if (dir == RESIZE_DIR_H)
1106                         mf_in->width = pix_out->width;
1107                 else
1108                         mf_in->height = pix_out->height;
1109 
1110                 if (apply)
1111                         memcpy(&pcdev->resizing[dir], &tmprsz, sizeof(tmprsz));
1112         }
1113         return 0;
1114 }
1115 
1116 static int mx2_camera_set_fmt(struct soc_camera_device *icd,
1117                                struct v4l2_format *f)
1118 {
1119         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1120         struct mx2_camera_dev *pcdev = ici->priv;
1121         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1122         const struct soc_camera_format_xlate *xlate;
1123         struct v4l2_pix_format *pix = &f->fmt.pix;
1124         struct v4l2_mbus_framefmt mf;
1125         int ret;
1126 
1127         dev_dbg(icd->parent, "%s: requested params: width = %d, height = %d\n",
1128                 __func__, pix->width, pix->height);
1129 
1130         xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
1131         if (!xlate) {
1132                 dev_warn(icd->parent, "Format %x not found\n",
1133                                 pix->pixelformat);
1134                 return -EINVAL;
1135         }
1136 
1137         mf.width        = pix->width;
1138         mf.height       = pix->height;
1139         mf.field        = pix->field;
1140         mf.colorspace   = pix->colorspace;
1141         mf.code         = xlate->code;
1142 
1143         ret = v4l2_subdev_call(sd, video, s_mbus_fmt, &mf);
1144         if (ret < 0 && ret != -ENOIOCTLCMD)
1145                 return ret;
1146 
1147         /* Store width and height returned by the sensor for resizing */
1148         pcdev->s_width = mf.width;
1149         pcdev->s_height = mf.height;
1150         dev_dbg(icd->parent, "%s: sensor params: width = %d, height = %d\n",
1151                 __func__, pcdev->s_width, pcdev->s_height);
1152 
1153         pcdev->emma_prp = mx27_emma_prp_get_format(xlate->code,
1154                                                    xlate->host_fmt->fourcc);
1155 
1156         memset(pcdev->resizing, 0, sizeof(pcdev->resizing));
1157         if ((mf.width != pix->width || mf.height != pix->height) &&
1158                 pcdev->emma_prp->cfg.in_fmt == PRP_CNTL_DATA_IN_YUV422) {
1159                 if (mx2_emmaprp_resize(pcdev, &mf, pix, true) < 0)
1160                         dev_dbg(icd->parent, "%s: can't resize\n", __func__);
1161         }
1162 
1163         if (mf.code != xlate->code)
1164                 return -EINVAL;
1165 
1166         pix->width              = mf.width;
1167         pix->height             = mf.height;
1168         pix->field              = mf.field;
1169         pix->colorspace         = mf.colorspace;
1170         icd->current_fmt        = xlate;
1171 
1172         dev_dbg(icd->parent, "%s: returned params: width = %d, height = %d\n",
1173                 __func__, pix->width, pix->height);
1174 
1175         return 0;
1176 }
1177 
1178 static int mx2_camera_try_fmt(struct soc_camera_device *icd,
1179                                   struct v4l2_format *f)
1180 {
1181         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1182         const struct soc_camera_format_xlate *xlate;
1183         struct v4l2_pix_format *pix = &f->fmt.pix;
1184         struct v4l2_mbus_framefmt mf;
1185         __u32 pixfmt = pix->pixelformat;
1186         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1187         struct mx2_camera_dev *pcdev = ici->priv;
1188         struct mx2_fmt_cfg *emma_prp;
1189         int ret;
1190 
1191         dev_dbg(icd->parent, "%s: requested params: width = %d, height = %d\n",
1192                 __func__, pix->width, pix->height);
1193 
1194         xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1195         if (pixfmt && !xlate) {
1196                 dev_warn(icd->parent, "Format %x not found\n", pixfmt);
1197                 return -EINVAL;
1198         }
1199 
1200         /*
1201          * limit to MX27 hardware capabilities: width must be a multiple of 8 as
1202          * requested by the CSI. (Table 39-2 in the i.MX27 Reference Manual).
1203          */
1204         pix->width &= ~0x7;
1205 
1206         /* limit to sensor capabilities */
1207         mf.width        = pix->width;
1208         mf.height       = pix->height;
1209         mf.field        = pix->field;
1210         mf.colorspace   = pix->colorspace;
1211         mf.code         = xlate->code;
1212 
1213         ret = v4l2_subdev_call(sd, video, try_mbus_fmt, &mf);
1214         if (ret < 0)
1215                 return ret;
1216 
1217         dev_dbg(icd->parent, "%s: sensor params: width = %d, height = %d\n",
1218                 __func__, pcdev->s_width, pcdev->s_height);
1219 
1220         /* If the sensor does not support image size try PrP resizing */
1221         emma_prp = mx27_emma_prp_get_format(xlate->code,
1222                                             xlate->host_fmt->fourcc);
1223 
1224         if ((mf.width != pix->width || mf.height != pix->height) &&
1225                 emma_prp->cfg.in_fmt == PRP_CNTL_DATA_IN_YUV422) {
1226                 if (mx2_emmaprp_resize(pcdev, &mf, pix, false) < 0)
1227                         dev_dbg(icd->parent, "%s: can't resize\n", __func__);
1228         }
1229 
1230         if (mf.field == V4L2_FIELD_ANY)
1231                 mf.field = V4L2_FIELD_NONE;
1232         /*
1233          * Driver supports interlaced images provided they have
1234          * both fields so that they can be processed as if they
1235          * were progressive.
1236          */
1237         if (mf.field != V4L2_FIELD_NONE && !V4L2_FIELD_HAS_BOTH(mf.field)) {
1238                 dev_err(icd->parent, "Field type %d unsupported.\n",
1239                                 mf.field);
1240                 return -EINVAL;
1241         }
1242 
1243         pix->width      = mf.width;
1244         pix->height     = mf.height;
1245         pix->field      = mf.field;
1246         pix->colorspace = mf.colorspace;
1247 
1248         dev_dbg(icd->parent, "%s: returned params: width = %d, height = %d\n",
1249                 __func__, pix->width, pix->height);
1250 
1251         return 0;
1252 }
1253 
1254 static int mx2_camera_querycap(struct soc_camera_host *ici,
1255                                struct v4l2_capability *cap)
1256 {
1257         /* cap->name is set by the friendly caller:-> */
1258         strlcpy(cap->card, MX2_CAM_DRIVER_DESCRIPTION, sizeof(cap->card));
1259         cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
1260         cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
1261 
1262         return 0;
1263 }
1264 
1265 static unsigned int mx2_camera_poll(struct file *file, poll_table *pt)
1266 {
1267         struct soc_camera_device *icd = file->private_data;
1268 
1269         return vb2_poll(&icd->vb2_vidq, file, pt);
1270 }
1271 
1272 static struct soc_camera_host_ops mx2_soc_camera_host_ops = {
1273         .owner          = THIS_MODULE,
1274         .add            = mx2_camera_add_device,
1275         .remove         = mx2_camera_remove_device,
1276         .clock_start    = mx2_camera_clock_start,
1277         .clock_stop     = mx2_camera_clock_stop,
1278         .set_fmt        = mx2_camera_set_fmt,
1279         .set_crop       = mx2_camera_set_crop,
1280         .get_formats    = mx2_camera_get_formats,
1281         .try_fmt        = mx2_camera_try_fmt,
1282         .init_videobuf2 = mx2_camera_init_videobuf,
1283         .poll           = mx2_camera_poll,
1284         .querycap       = mx2_camera_querycap,
1285         .set_bus_param  = mx2_camera_set_bus_param,
1286 };
1287 
1288 static void mx27_camera_frame_done_emma(struct mx2_camera_dev *pcdev,
1289                 int bufnum, bool err)
1290 {
1291 #ifdef DEBUG
1292         struct mx2_fmt_cfg *prp = pcdev->emma_prp;
1293 #endif
1294         struct mx2_buf_internal *ibuf;
1295         struct mx2_buffer *buf;
1296         struct vb2_buffer *vb;
1297         unsigned long phys;
1298 
1299         ibuf = list_first_entry(&pcdev->active_bufs, struct mx2_buf_internal,
1300                                queue);
1301 
1302         BUG_ON(ibuf->bufnum != bufnum);
1303 
1304         if (ibuf->discard) {
1305                 /*
1306                  * Discard buffer must not be returned to user space.
1307                  * Just return it to the discard queue.
1308                  */
1309                 list_move_tail(pcdev->active_bufs.next, &pcdev->discard);
1310         } else {
1311                 buf = mx2_ibuf_to_buf(ibuf);
1312 
1313                 vb = &buf->vb;
1314 #ifdef DEBUG
1315                 phys = vb2_dma_contig_plane_dma_addr(vb, 0);
1316                 if (prp->cfg.channel == 1) {
1317                         if (readl(pcdev->base_emma + PRP_DEST_RGB1_PTR +
1318                                 4 * bufnum) != phys) {
1319                                 dev_err(pcdev->dev, "%lx != %x\n", phys,
1320                                         readl(pcdev->base_emma +
1321                                         PRP_DEST_RGB1_PTR + 4 * bufnum));
1322                         }
1323                 } else {
1324                         if (readl(pcdev->base_emma + PRP_DEST_Y_PTR -
1325                                 0x14 * bufnum) != phys) {
1326                                 dev_err(pcdev->dev, "%lx != %x\n", phys,
1327                                         readl(pcdev->base_emma +
1328                                         PRP_DEST_Y_PTR - 0x14 * bufnum));
1329                         }
1330                 }
1331 #endif
1332                 dev_dbg(pcdev->dev, "%s (vb=0x%p) 0x%p %lu\n", __func__, vb,
1333                                 vb2_plane_vaddr(vb, 0),
1334                                 vb2_get_plane_payload(vb, 0));
1335 
1336                 list_del_init(&buf->internal.queue);
1337                 v4l2_get_timestamp(&vb->v4l2_buf.timestamp);
1338                 vb->v4l2_buf.sequence = pcdev->frame_count;
1339                 if (err)
1340                         vb2_buffer_done(vb, VB2_BUF_STATE_ERROR);
1341                 else
1342                         vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
1343         }
1344 
1345         pcdev->frame_count++;
1346 
1347         if (list_empty(&pcdev->capture)) {
1348                 if (list_empty(&pcdev->discard)) {
1349                         dev_warn(pcdev->dev, "%s: trying to access empty discard list\n",
1350                                  __func__);
1351                         return;
1352                 }
1353 
1354                 ibuf = list_first_entry(&pcdev->discard,
1355                                         struct mx2_buf_internal, queue);
1356                 ibuf->bufnum = bufnum;
1357 
1358                 list_move_tail(pcdev->discard.next, &pcdev->active_bufs);
1359                 mx27_update_emma_buf(pcdev, pcdev->discard_buffer_dma, bufnum);
1360                 return;
1361         }
1362 
1363         buf = list_first_entry(&pcdev->capture, struct mx2_buffer,
1364                                internal.queue);
1365 
1366         buf->internal.bufnum = bufnum;
1367 
1368         list_move_tail(pcdev->capture.next, &pcdev->active_bufs);
1369 
1370         vb = &buf->vb;
1371 
1372         phys = vb2_dma_contig_plane_dma_addr(vb, 0);
1373         mx27_update_emma_buf(pcdev, phys, bufnum);
1374 }
1375 
1376 static irqreturn_t mx27_camera_emma_irq(int irq_emma, void *data)
1377 {
1378         struct mx2_camera_dev *pcdev = data;
1379         unsigned int status = readl(pcdev->base_emma + PRP_INTRSTATUS);
1380         struct mx2_buf_internal *ibuf;
1381 
1382         spin_lock(&pcdev->lock);
1383 
1384         if (list_empty(&pcdev->active_bufs)) {
1385                 dev_warn(pcdev->dev, "%s: called while active list is empty\n",
1386                         __func__);
1387 
1388                 if (!status) {
1389                         spin_unlock(&pcdev->lock);
1390                         return IRQ_NONE;
1391                 }
1392         }
1393 
1394         if (status & (1 << 7)) { /* overflow */
1395                 u32 cntl = readl(pcdev->base_emma + PRP_CNTL);
1396                 writel(cntl & ~(PRP_CNTL_CH1EN | PRP_CNTL_CH2EN),
1397                        pcdev->base_emma + PRP_CNTL);
1398                 writel(cntl, pcdev->base_emma + PRP_CNTL);
1399 
1400                 ibuf = list_first_entry(&pcdev->active_bufs,
1401                                         struct mx2_buf_internal, queue);
1402                 mx27_camera_frame_done_emma(pcdev,
1403                                         ibuf->bufnum, true);
1404 
1405                 status &= ~(1 << 7);
1406         } else if (((status & (3 << 5)) == (3 << 5)) ||
1407                 ((status & (3 << 3)) == (3 << 3))) {
1408                 /*
1409                  * Both buffers have triggered, process the one we're expecting
1410                  * to first
1411                  */
1412                 ibuf = list_first_entry(&pcdev->active_bufs,
1413                                         struct mx2_buf_internal, queue);
1414                 mx27_camera_frame_done_emma(pcdev, ibuf->bufnum, false);
1415                 status &= ~(1 << (6 - ibuf->bufnum)); /* mark processed */
1416         } else if ((status & (1 << 6)) || (status & (1 << 4))) {
1417                 mx27_camera_frame_done_emma(pcdev, 0, false);
1418         } else if ((status & (1 << 5)) || (status & (1 << 3))) {
1419                 mx27_camera_frame_done_emma(pcdev, 1, false);
1420         }
1421 
1422         spin_unlock(&pcdev->lock);
1423         writel(status, pcdev->base_emma + PRP_INTRSTATUS);
1424 
1425         return IRQ_HANDLED;
1426 }
1427 
1428 static int mx27_camera_emma_init(struct platform_device *pdev)
1429 {
1430         struct mx2_camera_dev *pcdev = platform_get_drvdata(pdev);
1431         struct resource *res_emma;
1432         int irq_emma;
1433         int err = 0;
1434 
1435         res_emma = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1436         irq_emma = platform_get_irq(pdev, 1);
1437         if (!res_emma || !irq_emma) {
1438                 dev_err(pcdev->dev, "no EMMA resources\n");
1439                 err = -ENODEV;
1440                 goto out;
1441         }
1442 
1443         pcdev->base_emma = devm_ioremap_resource(pcdev->dev, res_emma);
1444         if (IS_ERR(pcdev->base_emma)) {
1445                 err = PTR_ERR(pcdev->base_emma);
1446                 goto out;
1447         }
1448 
1449         err = devm_request_irq(pcdev->dev, irq_emma, mx27_camera_emma_irq, 0,
1450                                MX2_CAM_DRV_NAME, pcdev);
1451         if (err) {
1452                 dev_err(pcdev->dev, "Camera EMMA interrupt register failed\n");
1453                 goto out;
1454         }
1455 
1456         pcdev->clk_emma_ipg = devm_clk_get(pcdev->dev, "emma-ipg");
1457         if (IS_ERR(pcdev->clk_emma_ipg)) {
1458                 err = PTR_ERR(pcdev->clk_emma_ipg);
1459                 goto out;
1460         }
1461 
1462         clk_prepare_enable(pcdev->clk_emma_ipg);
1463 
1464         pcdev->clk_emma_ahb = devm_clk_get(pcdev->dev, "emma-ahb");
1465         if (IS_ERR(pcdev->clk_emma_ahb)) {
1466                 err = PTR_ERR(pcdev->clk_emma_ahb);
1467                 goto exit_clk_emma_ipg;
1468         }
1469 
1470         clk_prepare_enable(pcdev->clk_emma_ahb);
1471 
1472         err = mx27_camera_emma_prp_reset(pcdev);
1473         if (err)
1474                 goto exit_clk_emma_ahb;
1475 
1476         return err;
1477 
1478 exit_clk_emma_ahb:
1479         clk_disable_unprepare(pcdev->clk_emma_ahb);
1480 exit_clk_emma_ipg:
1481         clk_disable_unprepare(pcdev->clk_emma_ipg);
1482 out:
1483         return err;
1484 }
1485 
1486 static int mx2_camera_probe(struct platform_device *pdev)
1487 {
1488         struct mx2_camera_dev *pcdev;
1489         struct resource *res_csi;
1490         int irq_csi;
1491         int err = 0;
1492 
1493         dev_dbg(&pdev->dev, "initialising\n");
1494 
1495         res_csi = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1496         irq_csi = platform_get_irq(pdev, 0);
1497         if (res_csi == NULL || irq_csi < 0) {
1498                 dev_err(&pdev->dev, "Missing platform resources data\n");
1499                 err = -ENODEV;
1500                 goto exit;
1501         }
1502 
1503         pcdev = devm_kzalloc(&pdev->dev, sizeof(*pcdev), GFP_KERNEL);
1504         if (!pcdev) {
1505                 dev_err(&pdev->dev, "Could not allocate pcdev\n");
1506                 err = -ENOMEM;
1507                 goto exit;
1508         }
1509 
1510         pcdev->clk_csi_ahb = devm_clk_get(&pdev->dev, "ahb");
1511         if (IS_ERR(pcdev->clk_csi_ahb)) {
1512                 dev_err(&pdev->dev, "Could not get csi ahb clock\n");
1513                 err = PTR_ERR(pcdev->clk_csi_ahb);
1514                 goto exit;
1515         }
1516 
1517         pcdev->clk_csi_per = devm_clk_get(&pdev->dev, "per");
1518         if (IS_ERR(pcdev->clk_csi_per)) {
1519                 dev_err(&pdev->dev, "Could not get csi per clock\n");
1520                 err = PTR_ERR(pcdev->clk_csi_per);
1521                 goto exit;
1522         }
1523 
1524         pcdev->pdata = pdev->dev.platform_data;
1525         if (pcdev->pdata) {
1526                 long rate;
1527 
1528                 pcdev->platform_flags = pcdev->pdata->flags;
1529 
1530                 rate = clk_round_rate(pcdev->clk_csi_per,
1531                                                 pcdev->pdata->clk * 2);
1532                 if (rate <= 0) {
1533                         err = -ENODEV;
1534                         goto exit;
1535                 }
1536                 err = clk_set_rate(pcdev->clk_csi_per, rate);
1537                 if (err < 0)
1538                         goto exit;
1539         }
1540 
1541         INIT_LIST_HEAD(&pcdev->capture);
1542         INIT_LIST_HEAD(&pcdev->active_bufs);
1543         INIT_LIST_HEAD(&pcdev->discard);
1544         spin_lock_init(&pcdev->lock);
1545 
1546         pcdev->base_csi = devm_ioremap_resource(&pdev->dev, res_csi);
1547         if (IS_ERR(pcdev->base_csi)) {
1548                 err = PTR_ERR(pcdev->base_csi);
1549                 goto exit;
1550         }
1551 
1552         pcdev->dev = &pdev->dev;
1553         platform_set_drvdata(pdev, pcdev);
1554 
1555         err = mx27_camera_emma_init(pdev);
1556         if (err)
1557                 goto exit;
1558 
1559         /*
1560          * We're done with drvdata here.  Clear the pointer so that
1561          * v4l2 core can start using drvdata on its purpose.
1562          */
1563         platform_set_drvdata(pdev, NULL);
1564 
1565         pcdev->soc_host.drv_name        = MX2_CAM_DRV_NAME,
1566         pcdev->soc_host.ops             = &mx2_soc_camera_host_ops,
1567         pcdev->soc_host.priv            = pcdev;
1568         pcdev->soc_host.v4l2_dev.dev    = &pdev->dev;
1569         pcdev->soc_host.nr              = pdev->id;
1570 
1571         pcdev->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
1572         if (IS_ERR(pcdev->alloc_ctx)) {
1573                 err = PTR_ERR(pcdev->alloc_ctx);
1574                 goto eallocctx;
1575         }
1576         err = soc_camera_host_register(&pcdev->soc_host);
1577         if (err)
1578                 goto exit_free_emma;
1579 
1580         dev_info(&pdev->dev, "MX2 Camera (CSI) driver probed, clock frequency: %ld\n",
1581                         clk_get_rate(pcdev->clk_csi_per));
1582 
1583         return 0;
1584 
1585 exit_free_emma:
1586         vb2_dma_contig_cleanup_ctx(pcdev->alloc_ctx);
1587 eallocctx:
1588         clk_disable_unprepare(pcdev->clk_emma_ipg);
1589         clk_disable_unprepare(pcdev->clk_emma_ahb);
1590 exit:
1591         return err;
1592 }
1593 
1594 static int mx2_camera_remove(struct platform_device *pdev)
1595 {
1596         struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
1597         struct mx2_camera_dev *pcdev = container_of(soc_host,
1598                         struct mx2_camera_dev, soc_host);
1599 
1600         soc_camera_host_unregister(&pcdev->soc_host);
1601 
1602         vb2_dma_contig_cleanup_ctx(pcdev->alloc_ctx);
1603 
1604         clk_disable_unprepare(pcdev->clk_emma_ipg);
1605         clk_disable_unprepare(pcdev->clk_emma_ahb);
1606 
1607         dev_info(&pdev->dev, "MX2 Camera driver unloaded\n");
1608 
1609         return 0;
1610 }
1611 
1612 static struct platform_driver mx2_camera_driver = {
1613         .driver         = {
1614                 .name   = MX2_CAM_DRV_NAME,
1615         },
1616         .id_table       = mx2_camera_devtype,
1617         .remove         = mx2_camera_remove,
1618 };
1619 
1620 module_platform_driver_probe(mx2_camera_driver, mx2_camera_probe);
1621 
1622 MODULE_DESCRIPTION("i.MX27 SoC Camera Host driver");
1623 MODULE_AUTHOR("Sascha Hauer <sha@pengutronix.de>");
1624 MODULE_LICENSE("GPL");
1625 MODULE_VERSION(MX2_CAM_VERSION);
1626 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us