1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * V4L2 Driver for PXA camera host
4  *
5  * Copyright (C) 2006, Sascha Hauer, Pengutronix
6  * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
7  * Copyright (C) 2016, Robert Jarzmik <robert.jarzmik@free.fr>
8  */
9 
10 #include <linux/init.h>
11 #include <linux/module.h>
12 #include <linux/io.h>
13 #include <linux/delay.h>
14 #include <linux/device.h>
15 #include <linux/dma-mapping.h>
16 #include <linux/err.h>
17 #include <linux/errno.h>
18 #include <linux/fs.h>
19 #include <linux/interrupt.h>
20 #include <linux/kernel.h>
21 #include <linux/mm.h>
22 #include <linux/moduleparam.h>
23 #include <linux/of.h>
24 #include <linux/of_graph.h>
25 #include <linux/time.h>
26 #include <linux/platform_device.h>
27 #include <linux/clk.h>
28 #include <linux/sched.h>
29 #include <linux/slab.h>
30 #include <linux/dmaengine.h>
31 #include <linux/dma/pxa-dma.h>
32 
33 #include <media/v4l2-async.h>
34 #include <media/v4l2-common.h>
35 #include <media/v4l2-ctrls.h>
36 #include <media/v4l2-device.h>
37 #include <media/v4l2-event.h>
38 #include <media/v4l2-ioctl.h>
39 #include <media/v4l2-fwnode.h>
40 
41 #include <media/videobuf2-dma-sg.h>
42 
43 #include <linux/videodev2.h>
44 
45 #include <linux/platform_data/media/camera-pxa.h>
46 
47 #define PXA_CAM_VERSION "0.0.6"
48 #define PXA_CAM_DRV_NAME "pxa27x-camera"
49 
50 #define DEFAULT_WIDTH	640
51 #define DEFAULT_HEIGHT	480
52 
53 /* Camera Interface */
54 #define CICR0		0x0000
55 #define CICR1		0x0004
56 #define CICR2		0x0008
57 #define CICR3		0x000C
58 #define CICR4		0x0010
59 #define CISR		0x0014
60 #define CIFR		0x0018
61 #define CITOR		0x001C
62 #define CIBR0		0x0028
63 #define CIBR1		0x0030
64 #define CIBR2		0x0038
65 
66 #define CICR0_DMAEN	(1UL << 31)	/* DMA request enable */
67 #define CICR0_PAR_EN	(1 << 30)	/* Parity enable */
68 #define CICR0_SL_CAP_EN	(1 << 29)	/* Capture enable for slave mode */
69 #define CICR0_ENB	(1 << 28)	/* Camera interface enable */
70 #define CICR0_DIS	(1 << 27)	/* Camera interface disable */
71 #define CICR0_SIM	(0x7 << 24)	/* Sensor interface mode mask */
72 #define CICR0_TOM	(1 << 9)	/* Time-out mask */
73 #define CICR0_RDAVM	(1 << 8)	/* Receive-data-available mask */
74 #define CICR0_FEM	(1 << 7)	/* FIFO-empty mask */
75 #define CICR0_EOLM	(1 << 6)	/* End-of-line mask */
76 #define CICR0_PERRM	(1 << 5)	/* Parity-error mask */
77 #define CICR0_QDM	(1 << 4)	/* Quick-disable mask */
78 #define CICR0_CDM	(1 << 3)	/* Disable-done mask */
79 #define CICR0_SOFM	(1 << 2)	/* Start-of-frame mask */
80 #define CICR0_EOFM	(1 << 1)	/* End-of-frame mask */
81 #define CICR0_FOM	(1 << 0)	/* FIFO-overrun mask */
82 
83 #define CICR1_TBIT	(1UL << 31)	/* Transparency bit */
84 #define CICR1_RGBT_CONV	(0x3 << 29)	/* RGBT conversion mask */
85 #define CICR1_PPL	(0x7ff << 15)	/* Pixels per line mask */
86 #define CICR1_RGB_CONV	(0x7 << 12)	/* RGB conversion mask */
87 #define CICR1_RGB_F	(1 << 11)	/* RGB format */
88 #define CICR1_YCBCR_F	(1 << 10)	/* YCbCr format */
89 #define CICR1_RGB_BPP	(0x7 << 7)	/* RGB bis per pixel mask */
90 #define CICR1_RAW_BPP	(0x3 << 5)	/* Raw bis per pixel mask */
91 #define CICR1_COLOR_SP	(0x3 << 3)	/* Color space mask */
92 #define CICR1_DW	(0x7 << 0)	/* Data width mask */
93 
94 #define CICR2_BLW	(0xff << 24)	/* Beginning-of-line pixel clock
95 					   wait count mask */
96 #define CICR2_ELW	(0xff << 16)	/* End-of-line pixel clock
97 					   wait count mask */
98 #define CICR2_HSW	(0x3f << 10)	/* Horizontal sync pulse width mask */
99 #define CICR2_BFPW	(0x3f << 3)	/* Beginning-of-frame pixel clock
100 					   wait count mask */
101 #define CICR2_FSW	(0x7 << 0)	/* Frame stabilization
102 					   wait count mask */
103 
104 #define CICR3_BFW	(0xff << 24)	/* Beginning-of-frame line clock
105 					   wait count mask */
106 #define CICR3_EFW	(0xff << 16)	/* End-of-frame line clock
107 					   wait count mask */
108 #define CICR3_VSW	(0x3f << 10)	/* Vertical sync pulse width mask */
109 #define CICR3_BFPW	(0x3f << 3)	/* Beginning-of-frame pixel clock
110 					   wait count mask */
111 #define CICR3_LPF	(0x7ff << 0)	/* Lines per frame mask */
112 
113 #define CICR4_MCLK_DLY	(0x3 << 24)	/* MCLK Data Capture Delay mask */
114 #define CICR4_PCLK_EN	(1 << 23)	/* Pixel clock enable */
115 #define CICR4_PCP	(1 << 22)	/* Pixel clock polarity */
116 #define CICR4_HSP	(1 << 21)	/* Horizontal sync polarity */
117 #define CICR4_VSP	(1 << 20)	/* Vertical sync polarity */
118 #define CICR4_MCLK_EN	(1 << 19)	/* MCLK enable */
119 #define CICR4_FR_RATE	(0x7 << 8)	/* Frame rate mask */
120 #define CICR4_DIV	(0xff << 0)	/* Clock divisor mask */
121 
122 #define CISR_FTO	(1 << 15)	/* FIFO time-out */
123 #define CISR_RDAV_2	(1 << 14)	/* Channel 2 receive data available */
124 #define CISR_RDAV_1	(1 << 13)	/* Channel 1 receive data available */
125 #define CISR_RDAV_0	(1 << 12)	/* Channel 0 receive data available */
126 #define CISR_FEMPTY_2	(1 << 11)	/* Channel 2 FIFO empty */
127 #define CISR_FEMPTY_1	(1 << 10)	/* Channel 1 FIFO empty */
128 #define CISR_FEMPTY_0	(1 << 9)	/* Channel 0 FIFO empty */
129 #define CISR_EOL	(1 << 8)	/* End of line */
130 #define CISR_PAR_ERR	(1 << 7)	/* Parity error */
131 #define CISR_CQD	(1 << 6)	/* Camera interface quick disable */
132 #define CISR_CDD	(1 << 5)	/* Camera interface disable done */
133 #define CISR_SOF	(1 << 4)	/* Start of frame */
134 #define CISR_EOF	(1 << 3)	/* End of frame */
135 #define CISR_IFO_2	(1 << 2)	/* FIFO overrun for Channel 2 */
136 #define CISR_IFO_1	(1 << 1)	/* FIFO overrun for Channel 1 */
137 #define CISR_IFO_0	(1 << 0)	/* FIFO overrun for Channel 0 */
138 
139 #define CIFR_FLVL2	(0x7f << 23)	/* FIFO 2 level mask */
140 #define CIFR_FLVL1	(0x7f << 16)	/* FIFO 1 level mask */
141 #define CIFR_FLVL0	(0xff << 8)	/* FIFO 0 level mask */
142 #define CIFR_THL_0	(0x3 << 4)	/* Threshold Level for Channel 0 FIFO */
143 #define CIFR_RESET_F	(1 << 3)	/* Reset input FIFOs */
144 #define CIFR_FEN2	(1 << 2)	/* FIFO enable for channel 2 */
145 #define CIFR_FEN1	(1 << 1)	/* FIFO enable for channel 1 */
146 #define CIFR_FEN0	(1 << 0)	/* FIFO enable for channel 0 */
147 
148 #define CICR0_SIM_MP	(0 << 24)
149 #define CICR0_SIM_SP	(1 << 24)
150 #define CICR0_SIM_MS	(2 << 24)
151 #define CICR0_SIM_EP	(3 << 24)
152 #define CICR0_SIM_ES	(4 << 24)
153 
154 #define CICR1_DW_VAL(x)   ((x) & CICR1_DW)	    /* Data bus width */
155 #define CICR1_PPL_VAL(x)  (((x) << 15) & CICR1_PPL) /* Pixels per line */
156 #define CICR1_COLOR_SP_VAL(x)	(((x) << 3) & CICR1_COLOR_SP)	/* color space */
157 #define CICR1_RGB_BPP_VAL(x)	(((x) << 7) & CICR1_RGB_BPP)	/* bpp for rgb */
158 #define CICR1_RGBT_CONV_VAL(x)	(((x) << 29) & CICR1_RGBT_CONV)	/* rgbt conv */
159 
160 #define CICR2_BLW_VAL(x)  (((x) << 24) & CICR2_BLW) /* Beginning-of-line pixel clock wait count */
161 #define CICR2_ELW_VAL(x)  (((x) << 16) & CICR2_ELW) /* End-of-line pixel clock wait count */
162 #define CICR2_HSW_VAL(x)  (((x) << 10) & CICR2_HSW) /* Horizontal sync pulse width */
163 #define CICR2_BFPW_VAL(x) (((x) << 3) & CICR2_BFPW) /* Beginning-of-frame pixel clock wait count */
164 #define CICR2_FSW_VAL(x)  (((x) << 0) & CICR2_FSW)  /* Frame stabilization wait count */
165 
166 #define CICR3_BFW_VAL(x)  (((x) << 24) & CICR3_BFW) /* Beginning-of-frame line clock wait count  */
167 #define CICR3_EFW_VAL(x)  (((x) << 16) & CICR3_EFW) /* End-of-frame line clock wait count */
168 #define CICR3_VSW_VAL(x)  (((x) << 11) & CICR3_VSW) /* Vertical sync pulse width */
169 #define CICR3_LPF_VAL(x)  (((x) << 0) & CICR3_LPF)  /* Lines per frame */
170 
171 #define CICR0_IRQ_MASK (CICR0_TOM | CICR0_RDAVM | CICR0_FEM | CICR0_EOLM | \
172 			CICR0_PERRM | CICR0_QDM | CICR0_CDM | CICR0_SOFM | \
173 			CICR0_EOFM | CICR0_FOM)
174 
175 #define sensor_call(cam, o, f, args...) \
176 	v4l2_subdev_call(cam->sensor, o, f, ##args)
177 
178 /*
179  * Format handling
180  */
181 
182 /**
183  * enum pxa_mbus_packing - data packing types on the media-bus
184  * @PXA_MBUS_PACKING_NONE:	no packing, bit-for-bit transfer to RAM, one
185  *				sample represents one pixel
186  * @PXA_MBUS_PACKING_2X8_PADHI:	16 bits transferred in 2 8-bit samples, in the
187  *				possibly incomplete byte high bits are padding
188  * @PXA_MBUS_PACKING_EXTEND16:	sample width (e.g., 10 bits) has to be extended
189  *				to 16 bits
190  */
191 enum pxa_mbus_packing {
192 	PXA_MBUS_PACKING_NONE,
193 	PXA_MBUS_PACKING_2X8_PADHI,
194 	PXA_MBUS_PACKING_EXTEND16,
195 };
196 
197 /**
198  * enum pxa_mbus_order - sample order on the media bus
199  * @PXA_MBUS_ORDER_LE:		least significant sample first
200  * @PXA_MBUS_ORDER_BE:		most significant sample first
201  */
202 enum pxa_mbus_order {
203 	PXA_MBUS_ORDER_LE,
204 	PXA_MBUS_ORDER_BE,
205 };
206 
207 /**
208  * enum pxa_mbus_layout - planes layout in memory
209  * @PXA_MBUS_LAYOUT_PACKED:		color components packed
210  * @PXA_MBUS_LAYOUT_PLANAR_2Y_U_V:	YUV components stored in 3 planes (4:2:2)
211  * @PXA_MBUS_LAYOUT_PLANAR_2Y_C:	YUV components stored in a luma and a
212  *					chroma plane (C plane is half the size
213  *					of Y plane)
214  * @PXA_MBUS_LAYOUT_PLANAR_Y_C:		YUV components stored in a luma and a
215  *					chroma plane (C plane is the same size
216  *					as Y plane)
217  */
218 enum pxa_mbus_layout {
219 	PXA_MBUS_LAYOUT_PACKED = 0,
220 	PXA_MBUS_LAYOUT_PLANAR_2Y_U_V,
221 	PXA_MBUS_LAYOUT_PLANAR_2Y_C,
222 	PXA_MBUS_LAYOUT_PLANAR_Y_C,
223 };
224 
225 /**
226  * struct pxa_mbus_pixelfmt - Data format on the media bus
227  * @name:		Name of the format
228  * @fourcc:		Fourcc code, that will be obtained if the data is
229  *			stored in memory in the following way:
230  * @packing:		Type of sample-packing, that has to be used
231  * @order:		Sample order when storing in memory
232  * @layout:		Planes layout in memory
233  * @bits_per_sample:	How many bits the bridge has to sample
234  */
235 struct pxa_mbus_pixelfmt {
236 	const char		*name;
237 	u32			fourcc;
238 	enum pxa_mbus_packing	packing;
239 	enum pxa_mbus_order	order;
240 	enum pxa_mbus_layout	layout;
241 	u8			bits_per_sample;
242 };
243 
244 /**
245  * struct pxa_mbus_lookup - Lookup FOURCC IDs by mediabus codes for pass-through
246  * @code:	mediabus pixel-code
247  * @fmt:	pixel format description
248  */
249 struct pxa_mbus_lookup {
250 	u32	code;
251 	struct pxa_mbus_pixelfmt	fmt;
252 };
253 
254 static const struct pxa_mbus_lookup mbus_fmt[] = {
255 {
256 	.code = MEDIA_BUS_FMT_YUYV8_2X8,
257 	.fmt = {
258 		.fourcc			= V4L2_PIX_FMT_YUYV,
259 		.name			= "YUYV",
260 		.bits_per_sample	= 8,
261 		.packing		= PXA_MBUS_PACKING_2X8_PADHI,
262 		.order			= PXA_MBUS_ORDER_LE,
263 		.layout			= PXA_MBUS_LAYOUT_PACKED,
264 	},
265 }, {
266 	.code = MEDIA_BUS_FMT_YVYU8_2X8,
267 	.fmt = {
268 		.fourcc			= V4L2_PIX_FMT_YVYU,
269 		.name			= "YVYU",
270 		.bits_per_sample	= 8,
271 		.packing		= PXA_MBUS_PACKING_2X8_PADHI,
272 		.order			= PXA_MBUS_ORDER_LE,
273 		.layout			= PXA_MBUS_LAYOUT_PACKED,
274 	},
275 }, {
276 	.code = MEDIA_BUS_FMT_UYVY8_2X8,
277 	.fmt = {
278 		.fourcc			= V4L2_PIX_FMT_UYVY,
279 		.name			= "UYVY",
280 		.bits_per_sample	= 8,
281 		.packing		= PXA_MBUS_PACKING_2X8_PADHI,
282 		.order			= PXA_MBUS_ORDER_LE,
283 		.layout			= PXA_MBUS_LAYOUT_PACKED,
284 	},
285 }, {
286 	.code = MEDIA_BUS_FMT_VYUY8_2X8,
287 	.fmt = {
288 		.fourcc			= V4L2_PIX_FMT_VYUY,
289 		.name			= "VYUY",
290 		.bits_per_sample	= 8,
291 		.packing		= PXA_MBUS_PACKING_2X8_PADHI,
292 		.order			= PXA_MBUS_ORDER_LE,
293 		.layout			= PXA_MBUS_LAYOUT_PACKED,
294 	},
295 }, {
296 	.code = MEDIA_BUS_FMT_RGB555_2X8_PADHI_LE,
297 	.fmt = {
298 		.fourcc			= V4L2_PIX_FMT_RGB555,
299 		.name			= "RGB555",
300 		.bits_per_sample	= 8,
301 		.packing		= PXA_MBUS_PACKING_2X8_PADHI,
302 		.order			= PXA_MBUS_ORDER_LE,
303 		.layout			= PXA_MBUS_LAYOUT_PACKED,
304 	},
305 }, {
306 	.code = MEDIA_BUS_FMT_RGB555_2X8_PADHI_BE,
307 	.fmt = {
308 		.fourcc			= V4L2_PIX_FMT_RGB555X,
309 		.name			= "RGB555X",
310 		.bits_per_sample	= 8,
311 		.packing		= PXA_MBUS_PACKING_2X8_PADHI,
312 		.order			= PXA_MBUS_ORDER_BE,
313 		.layout			= PXA_MBUS_LAYOUT_PACKED,
314 	},
315 }, {
316 	.code = MEDIA_BUS_FMT_RGB565_2X8_LE,
317 	.fmt = {
318 		.fourcc			= V4L2_PIX_FMT_RGB565,
319 		.name			= "RGB565",
320 		.bits_per_sample	= 8,
321 		.packing		= PXA_MBUS_PACKING_2X8_PADHI,
322 		.order			= PXA_MBUS_ORDER_LE,
323 		.layout			= PXA_MBUS_LAYOUT_PACKED,
324 	},
325 }, {
326 	.code = MEDIA_BUS_FMT_RGB565_2X8_BE,
327 	.fmt = {
328 		.fourcc			= V4L2_PIX_FMT_RGB565X,
329 		.name			= "RGB565X",
330 		.bits_per_sample	= 8,
331 		.packing		= PXA_MBUS_PACKING_2X8_PADHI,
332 		.order			= PXA_MBUS_ORDER_BE,
333 		.layout			= PXA_MBUS_LAYOUT_PACKED,
334 	},
335 }, {
336 	.code = MEDIA_BUS_FMT_SBGGR8_1X8,
337 	.fmt = {
338 		.fourcc			= V4L2_PIX_FMT_SBGGR8,
339 		.name			= "Bayer 8 BGGR",
340 		.bits_per_sample	= 8,
341 		.packing		= PXA_MBUS_PACKING_NONE,
342 		.order			= PXA_MBUS_ORDER_LE,
343 		.layout			= PXA_MBUS_LAYOUT_PACKED,
344 	},
345 }, {
346 	.code = MEDIA_BUS_FMT_SGBRG8_1X8,
347 	.fmt = {
348 		.fourcc			= V4L2_PIX_FMT_SGBRG8,
349 		.name			= "Bayer 8 GBRG",
350 		.bits_per_sample	= 8,
351 		.packing		= PXA_MBUS_PACKING_NONE,
352 		.order			= PXA_MBUS_ORDER_LE,
353 		.layout			= PXA_MBUS_LAYOUT_PACKED,
354 	},
355 }, {
356 	.code = MEDIA_BUS_FMT_SGRBG8_1X8,
357 	.fmt = {
358 		.fourcc			= V4L2_PIX_FMT_SGRBG8,
359 		.name			= "Bayer 8 GRBG",
360 		.bits_per_sample	= 8,
361 		.packing		= PXA_MBUS_PACKING_NONE,
362 		.order			= PXA_MBUS_ORDER_LE,
363 		.layout			= PXA_MBUS_LAYOUT_PACKED,
364 	},
365 }, {
366 	.code = MEDIA_BUS_FMT_SRGGB8_1X8,
367 	.fmt = {
368 		.fourcc			= V4L2_PIX_FMT_SRGGB8,
369 		.name			= "Bayer 8 RGGB",
370 		.bits_per_sample	= 8,
371 		.packing		= PXA_MBUS_PACKING_NONE,
372 		.order			= PXA_MBUS_ORDER_LE,
373 		.layout			= PXA_MBUS_LAYOUT_PACKED,
374 	},
375 }, {
376 	.code = MEDIA_BUS_FMT_SBGGR10_1X10,
377 	.fmt = {
378 		.fourcc			= V4L2_PIX_FMT_SBGGR10,
379 		.name			= "Bayer 10 BGGR",
380 		.bits_per_sample	= 10,
381 		.packing		= PXA_MBUS_PACKING_EXTEND16,
382 		.order			= PXA_MBUS_ORDER_LE,
383 		.layout			= PXA_MBUS_LAYOUT_PACKED,
384 	},
385 }, {
386 	.code = MEDIA_BUS_FMT_Y8_1X8,
387 	.fmt = {
388 		.fourcc			= V4L2_PIX_FMT_GREY,
389 		.name			= "Grey",
390 		.bits_per_sample	= 8,
391 		.packing		= PXA_MBUS_PACKING_NONE,
392 		.order			= PXA_MBUS_ORDER_LE,
393 		.layout			= PXA_MBUS_LAYOUT_PACKED,
394 	},
395 }, {
396 	.code = MEDIA_BUS_FMT_Y10_1X10,
397 	.fmt = {
398 		.fourcc			= V4L2_PIX_FMT_Y10,
399 		.name			= "Grey 10bit",
400 		.bits_per_sample	= 10,
401 		.packing		= PXA_MBUS_PACKING_EXTEND16,
402 		.order			= PXA_MBUS_ORDER_LE,
403 		.layout			= PXA_MBUS_LAYOUT_PACKED,
404 	},
405 }, {
406 	.code = MEDIA_BUS_FMT_SBGGR10_2X8_PADHI_LE,
407 	.fmt = {
408 		.fourcc			= V4L2_PIX_FMT_SBGGR10,
409 		.name			= "Bayer 10 BGGR",
410 		.bits_per_sample	= 8,
411 		.packing		= PXA_MBUS_PACKING_2X8_PADHI,
412 		.order			= PXA_MBUS_ORDER_LE,
413 		.layout			= PXA_MBUS_LAYOUT_PACKED,
414 	},
415 }, {
416 	.code = MEDIA_BUS_FMT_SBGGR10_2X8_PADHI_BE,
417 	.fmt = {
418 		.fourcc			= V4L2_PIX_FMT_SBGGR10,
419 		.name			= "Bayer 10 BGGR",
420 		.bits_per_sample	= 8,
421 		.packing		= PXA_MBUS_PACKING_2X8_PADHI,
422 		.order			= PXA_MBUS_ORDER_BE,
423 		.layout			= PXA_MBUS_LAYOUT_PACKED,
424 	},
425 }, {
426 	.code = MEDIA_BUS_FMT_RGB444_2X8_PADHI_BE,
427 	.fmt = {
428 		.fourcc			= V4L2_PIX_FMT_RGB444,
429 		.name			= "RGB444",
430 		.bits_per_sample	= 8,
431 		.packing		= PXA_MBUS_PACKING_2X8_PADHI,
432 		.order			= PXA_MBUS_ORDER_BE,
433 		.layout			= PXA_MBUS_LAYOUT_PACKED,
434 	},
435 }, {
436 	.code = MEDIA_BUS_FMT_UYVY8_1X16,
437 	.fmt = {
438 		.fourcc			= V4L2_PIX_FMT_UYVY,
439 		.name			= "UYVY 16bit",
440 		.bits_per_sample	= 16,
441 		.packing		= PXA_MBUS_PACKING_EXTEND16,
442 		.order			= PXA_MBUS_ORDER_LE,
443 		.layout			= PXA_MBUS_LAYOUT_PACKED,
444 	},
445 }, {
446 	.code = MEDIA_BUS_FMT_VYUY8_1X16,
447 	.fmt = {
448 		.fourcc			= V4L2_PIX_FMT_VYUY,
449 		.name			= "VYUY 16bit",
450 		.bits_per_sample	= 16,
451 		.packing		= PXA_MBUS_PACKING_EXTEND16,
452 		.order			= PXA_MBUS_ORDER_LE,
453 		.layout			= PXA_MBUS_LAYOUT_PACKED,
454 	},
455 }, {
456 	.code = MEDIA_BUS_FMT_YUYV8_1X16,
457 	.fmt = {
458 		.fourcc			= V4L2_PIX_FMT_YUYV,
459 		.name			= "YUYV 16bit",
460 		.bits_per_sample	= 16,
461 		.packing		= PXA_MBUS_PACKING_EXTEND16,
462 		.order			= PXA_MBUS_ORDER_LE,
463 		.layout			= PXA_MBUS_LAYOUT_PACKED,
464 	},
465 }, {
466 	.code = MEDIA_BUS_FMT_YVYU8_1X16,
467 	.fmt = {
468 		.fourcc			= V4L2_PIX_FMT_YVYU,
469 		.name			= "YVYU 16bit",
470 		.bits_per_sample	= 16,
471 		.packing		= PXA_MBUS_PACKING_EXTEND16,
472 		.order			= PXA_MBUS_ORDER_LE,
473 		.layout			= PXA_MBUS_LAYOUT_PACKED,
474 	},
475 }, {
476 	.code = MEDIA_BUS_FMT_SGRBG10_DPCM8_1X8,
477 	.fmt = {
478 		.fourcc			= V4L2_PIX_FMT_SGRBG10DPCM8,
479 		.name			= "Bayer 10 BGGR DPCM 8",
480 		.bits_per_sample	= 8,
481 		.packing		= PXA_MBUS_PACKING_NONE,
482 		.order			= PXA_MBUS_ORDER_LE,
483 		.layout			= PXA_MBUS_LAYOUT_PACKED,
484 	},
485 }, {
486 	.code = MEDIA_BUS_FMT_SGBRG10_1X10,
487 	.fmt = {
488 		.fourcc			= V4L2_PIX_FMT_SGBRG10,
489 		.name			= "Bayer 10 GBRG",
490 		.bits_per_sample	= 10,
491 		.packing		= PXA_MBUS_PACKING_EXTEND16,
492 		.order			= PXA_MBUS_ORDER_LE,
493 		.layout			= PXA_MBUS_LAYOUT_PACKED,
494 	},
495 }, {
496 	.code = MEDIA_BUS_FMT_SGRBG10_1X10,
497 	.fmt = {
498 		.fourcc			= V4L2_PIX_FMT_SGRBG10,
499 		.name			= "Bayer 10 GRBG",
500 		.bits_per_sample	= 10,
501 		.packing		= PXA_MBUS_PACKING_EXTEND16,
502 		.order			= PXA_MBUS_ORDER_LE,
503 		.layout			= PXA_MBUS_LAYOUT_PACKED,
504 	},
505 }, {
506 	.code = MEDIA_BUS_FMT_SRGGB10_1X10,
507 	.fmt = {
508 		.fourcc			= V4L2_PIX_FMT_SRGGB10,
509 		.name			= "Bayer 10 RGGB",
510 		.bits_per_sample	= 10,
511 		.packing		= PXA_MBUS_PACKING_EXTEND16,
512 		.order			= PXA_MBUS_ORDER_LE,
513 		.layout			= PXA_MBUS_LAYOUT_PACKED,
514 	},
515 }, {
516 	.code = MEDIA_BUS_FMT_SBGGR12_1X12,
517 	.fmt = {
518 		.fourcc			= V4L2_PIX_FMT_SBGGR12,
519 		.name			= "Bayer 12 BGGR",
520 		.bits_per_sample	= 12,
521 		.packing		= PXA_MBUS_PACKING_EXTEND16,
522 		.order			= PXA_MBUS_ORDER_LE,
523 		.layout			= PXA_MBUS_LAYOUT_PACKED,
524 	},
525 }, {
526 	.code = MEDIA_BUS_FMT_SGBRG12_1X12,
527 	.fmt = {
528 		.fourcc			= V4L2_PIX_FMT_SGBRG12,
529 		.name			= "Bayer 12 GBRG",
530 		.bits_per_sample	= 12,
531 		.packing		= PXA_MBUS_PACKING_EXTEND16,
532 		.order			= PXA_MBUS_ORDER_LE,
533 		.layout			= PXA_MBUS_LAYOUT_PACKED,
534 	},
535 }, {
536 	.code = MEDIA_BUS_FMT_SGRBG12_1X12,
537 	.fmt = {
538 		.fourcc			= V4L2_PIX_FMT_SGRBG12,
539 		.name			= "Bayer 12 GRBG",
540 		.bits_per_sample	= 12,
541 		.packing		= PXA_MBUS_PACKING_EXTEND16,
542 		.order			= PXA_MBUS_ORDER_LE,
543 		.layout			= PXA_MBUS_LAYOUT_PACKED,
544 	},
545 }, {
546 	.code = MEDIA_BUS_FMT_SRGGB12_1X12,
547 	.fmt = {
548 		.fourcc			= V4L2_PIX_FMT_SRGGB12,
549 		.name			= "Bayer 12 RGGB",
550 		.bits_per_sample	= 12,
551 		.packing		= PXA_MBUS_PACKING_EXTEND16,
552 		.order			= PXA_MBUS_ORDER_LE,
553 		.layout			= PXA_MBUS_LAYOUT_PACKED,
554 	},
555 },
556 };
557 
pxa_mbus_bytes_per_line(u32 width,const struct pxa_mbus_pixelfmt * mf)558 static s32 pxa_mbus_bytes_per_line(u32 width, const struct pxa_mbus_pixelfmt *mf)
559 {
560 	if (mf->layout != PXA_MBUS_LAYOUT_PACKED)
561 		return width * mf->bits_per_sample / 8;
562 
563 	switch (mf->packing) {
564 	case PXA_MBUS_PACKING_NONE:
565 		return width * mf->bits_per_sample / 8;
566 	case PXA_MBUS_PACKING_2X8_PADHI:
567 	case PXA_MBUS_PACKING_EXTEND16:
568 		return width * 2;
569 	}
570 	return -EINVAL;
571 }
572 
pxa_mbus_image_size(const struct pxa_mbus_pixelfmt * mf,u32 bytes_per_line,u32 height)573 static s32 pxa_mbus_image_size(const struct pxa_mbus_pixelfmt *mf,
574 			u32 bytes_per_line, u32 height)
575 {
576 	if (mf->layout == PXA_MBUS_LAYOUT_PACKED)
577 		return bytes_per_line * height;
578 
579 	switch (mf->packing) {
580 	case PXA_MBUS_PACKING_2X8_PADHI:
581 		return bytes_per_line * height * 2;
582 	default:
583 		return -EINVAL;
584 	}
585 }
586 
pxa_mbus_find_fmtdesc(u32 code,const struct pxa_mbus_lookup * lookup,int n)587 static const struct pxa_mbus_pixelfmt *pxa_mbus_find_fmtdesc(
588 	u32 code,
589 	const struct pxa_mbus_lookup *lookup,
590 	int n)
591 {
592 	int i;
593 
594 	for (i = 0; i < n; i++)
595 		if (lookup[i].code == code)
596 			return &lookup[i].fmt;
597 
598 	return NULL;
599 }
600 
pxa_mbus_get_fmtdesc(u32 code)601 static const struct pxa_mbus_pixelfmt *pxa_mbus_get_fmtdesc(
602 	u32 code)
603 {
604 	return pxa_mbus_find_fmtdesc(code, mbus_fmt, ARRAY_SIZE(mbus_fmt));
605 }
606 
607 /**
608  * struct pxa_camera_format_xlate - match between host and sensor formats
609  * @code: code of a sensor provided format
610  * @host_fmt: host format after host translation from code
611  *
612  * Host and sensor translation structure. Used in table of host and sensor
613  * formats matchings in pxa_camera_device. A host can override the generic list
614  * generation by implementing get_formats(), and use it for format checks and
615  * format setup.
616  */
617 struct pxa_camera_format_xlate {
618 	u32 code;
619 	const struct pxa_mbus_pixelfmt *host_fmt;
620 };
621 
622 /*
623  * Structures
624  */
625 enum pxa_camera_active_dma {
626 	DMA_Y = 0x1,
627 	DMA_U = 0x2,
628 	DMA_V = 0x4,
629 };
630 
631 /* buffer for one video frame */
632 struct pxa_buffer {
633 	/* common v4l buffer stuff -- must be first */
634 	struct vb2_v4l2_buffer		vbuf;
635 	struct list_head		queue;
636 	u32	code;
637 	int				nb_planes;
638 	/* our descriptor lists for Y, U and V channels */
639 	struct dma_async_tx_descriptor	*descs[3];
640 	dma_cookie_t			cookie[3];
641 	struct scatterlist		*sg[3];
642 	int				sg_len[3];
643 	size_t				plane_sizes[3];
644 	int				inwork;
645 	enum pxa_camera_active_dma	active_dma;
646 };
647 
648 struct pxa_camera_dev {
649 	struct v4l2_device	v4l2_dev;
650 	struct video_device	vdev;
651 	struct v4l2_async_notifier notifier;
652 	struct vb2_queue	vb2_vq;
653 	struct v4l2_subdev	*sensor;
654 	struct pxa_camera_format_xlate *user_formats;
655 	const struct pxa_camera_format_xlate *current_fmt;
656 	struct v4l2_pix_format	current_pix;
657 
658 	/*
659 	 * PXA27x is only supposed to handle one camera on its Quick Capture
660 	 * interface. If anyone ever builds hardware to enable more than
661 	 * one camera, they will have to modify this driver too
662 	 */
663 	struct clk		*clk;
664 
665 	unsigned int		irq;
666 	void __iomem		*base;
667 
668 	int			channels;
669 	struct dma_chan		*dma_chans[3];
670 
671 	struct pxacamera_platform_data *pdata;
672 	struct resource		*res;
673 	unsigned long		platform_flags;
674 	unsigned long		ciclk;
675 	unsigned long		mclk;
676 	u32			mclk_divisor;
677 	u16			width_flags;	/* max 10 bits */
678 
679 	struct list_head	capture;
680 
681 	spinlock_t		lock;
682 	struct mutex		mlock;
683 	unsigned int		buf_sequence;
684 
685 	struct pxa_buffer	*active;
686 	struct tasklet_struct	task_eof;
687 
688 	u32			save_cicr[5];
689 };
690 
691 struct pxa_cam {
692 	unsigned long flags;
693 };
694 
695 static const char *pxa_cam_driver_description = "PXA_Camera";
696 
697 /*
698  * Format translation functions
699  */
700 static const struct pxa_camera_format_xlate
pxa_mbus_xlate_by_fourcc(struct pxa_camera_format_xlate * user_formats,unsigned int fourcc)701 *pxa_mbus_xlate_by_fourcc(struct pxa_camera_format_xlate *user_formats,
702 			  unsigned int fourcc)
703 {
704 	unsigned int i;
705 
706 	for (i = 0; user_formats[i].code; i++)
707 		if (user_formats[i].host_fmt->fourcc == fourcc)
708 			return user_formats + i;
709 	return NULL;
710 }
711 
pxa_mbus_build_fmts_xlate(struct v4l2_device * v4l2_dev,struct v4l2_subdev * subdev,int (* get_formats)(struct v4l2_device *,unsigned int,struct pxa_camera_format_xlate * xlate))712 static struct pxa_camera_format_xlate *pxa_mbus_build_fmts_xlate(
713 	struct v4l2_device *v4l2_dev, struct v4l2_subdev *subdev,
714 	int (*get_formats)(struct v4l2_device *, unsigned int,
715 			   struct pxa_camera_format_xlate *xlate))
716 {
717 	unsigned int i, fmts = 0, raw_fmts = 0;
718 	int ret;
719 	struct v4l2_subdev_mbus_code_enum code = {
720 		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
721 	};
722 	struct pxa_camera_format_xlate *user_formats;
723 
724 	while (!v4l2_subdev_call(subdev, pad, enum_mbus_code, NULL, &code)) {
725 		raw_fmts++;
726 		code.index++;
727 	}
728 
729 	/*
730 	 * First pass - only count formats this host-sensor
731 	 * configuration can provide
732 	 */
733 	for (i = 0; i < raw_fmts; i++) {
734 		ret = get_formats(v4l2_dev, i, NULL);
735 		if (ret < 0)
736 			return ERR_PTR(ret);
737 		fmts += ret;
738 	}
739 
740 	if (!fmts)
741 		return ERR_PTR(-ENXIO);
742 
743 	user_formats = kcalloc(fmts + 1, sizeof(*user_formats), GFP_KERNEL);
744 	if (!user_formats)
745 		return ERR_PTR(-ENOMEM);
746 
747 	/* Second pass - actually fill data formats */
748 	fmts = 0;
749 	for (i = 0; i < raw_fmts; i++) {
750 		ret = get_formats(v4l2_dev, i, user_formats + fmts);
751 		if (ret < 0)
752 			goto egfmt;
753 		fmts += ret;
754 	}
755 	user_formats[fmts].code = 0;
756 
757 	return user_formats;
758 egfmt:
759 	kfree(user_formats);
760 	return ERR_PTR(ret);
761 }
762 
763 /*
764  *  Videobuf operations
765  */
vb2_to_pxa_buffer(struct vb2_buffer * vb)766 static struct pxa_buffer *vb2_to_pxa_buffer(struct vb2_buffer *vb)
767 {
768 	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
769 
770 	return container_of(vbuf, struct pxa_buffer, vbuf);
771 }
772 
pcdev_to_dev(struct pxa_camera_dev * pcdev)773 static struct device *pcdev_to_dev(struct pxa_camera_dev *pcdev)
774 {
775 	return pcdev->v4l2_dev.dev;
776 }
777 
v4l2_dev_to_pcdev(struct v4l2_device * v4l2_dev)778 static struct pxa_camera_dev *v4l2_dev_to_pcdev(struct v4l2_device *v4l2_dev)
779 {
780 	return container_of(v4l2_dev, struct pxa_camera_dev, v4l2_dev);
781 }
782 
783 static void pxa_camera_dma_irq(struct pxa_camera_dev *pcdev,
784 			       enum pxa_camera_active_dma act_dma);
785 
pxa_camera_dma_irq_y(void * data)786 static void pxa_camera_dma_irq_y(void *data)
787 {
788 	struct pxa_camera_dev *pcdev = data;
789 
790 	pxa_camera_dma_irq(pcdev, DMA_Y);
791 }
792 
pxa_camera_dma_irq_u(void * data)793 static void pxa_camera_dma_irq_u(void *data)
794 {
795 	struct pxa_camera_dev *pcdev = data;
796 
797 	pxa_camera_dma_irq(pcdev, DMA_U);
798 }
799 
pxa_camera_dma_irq_v(void * data)800 static void pxa_camera_dma_irq_v(void *data)
801 {
802 	struct pxa_camera_dev *pcdev = data;
803 
804 	pxa_camera_dma_irq(pcdev, DMA_V);
805 }
806 
807 /**
808  * pxa_init_dma_channel - init dma descriptors
809  * @pcdev: pxa camera device
810  * @buf: pxa camera buffer
811  * @channel: dma channel (0 => 'Y', 1 => 'U', 2 => 'V')
812  * @sg: dma scatter list
813  * @sglen: dma scatter list length
814  *
815  * Prepares the pxa dma descriptors to transfer one camera channel.
816  *
817  * Returns 0 if success or -ENOMEM if no memory is available
818  */
pxa_init_dma_channel(struct pxa_camera_dev * pcdev,struct pxa_buffer * buf,int channel,struct scatterlist * sg,int sglen)819 static int pxa_init_dma_channel(struct pxa_camera_dev *pcdev,
820 				struct pxa_buffer *buf, int channel,
821 				struct scatterlist *sg, int sglen)
822 {
823 	struct dma_chan *dma_chan = pcdev->dma_chans[channel];
824 	struct dma_async_tx_descriptor *tx;
825 
826 	tx = dmaengine_prep_slave_sg(dma_chan, sg, sglen, DMA_DEV_TO_MEM,
827 				     DMA_PREP_INTERRUPT | DMA_CTRL_REUSE);
828 	if (!tx) {
829 		dev_err(pcdev_to_dev(pcdev),
830 			"dmaengine_prep_slave_sg failed\n");
831 		goto fail;
832 	}
833 
834 	tx->callback_param = pcdev;
835 	switch (channel) {
836 	case 0:
837 		tx->callback = pxa_camera_dma_irq_y;
838 		break;
839 	case 1:
840 		tx->callback = pxa_camera_dma_irq_u;
841 		break;
842 	case 2:
843 		tx->callback = pxa_camera_dma_irq_v;
844 		break;
845 	}
846 
847 	buf->descs[channel] = tx;
848 	return 0;
849 fail:
850 	dev_dbg(pcdev_to_dev(pcdev),
851 		"%s (vb=%p) dma_tx=%p\n",
852 		__func__, buf, tx);
853 
854 	return -ENOMEM;
855 }
856 
pxa_video_buf_set_actdma(struct pxa_camera_dev * pcdev,struct pxa_buffer * buf)857 static void pxa_video_buf_set_actdma(struct pxa_camera_dev *pcdev,
858 				    struct pxa_buffer *buf)
859 {
860 	buf->active_dma = DMA_Y;
861 	if (buf->nb_planes == 3)
862 		buf->active_dma |= DMA_U | DMA_V;
863 }
864 
865 /**
866  * pxa_dma_start_channels - start DMA channel for active buffer
867  * @pcdev: pxa camera device
868  *
869  * Initialize DMA channels to the beginning of the active video buffer, and
870  * start these channels.
871  */
pxa_dma_start_channels(struct pxa_camera_dev * pcdev)872 static void pxa_dma_start_channels(struct pxa_camera_dev *pcdev)
873 {
874 	int i;
875 
876 	for (i = 0; i < pcdev->channels; i++) {
877 		dev_dbg(pcdev_to_dev(pcdev),
878 			"%s (channel=%d)\n", __func__, i);
879 		dma_async_issue_pending(pcdev->dma_chans[i]);
880 	}
881 }
882 
pxa_dma_stop_channels(struct pxa_camera_dev * pcdev)883 static void pxa_dma_stop_channels(struct pxa_camera_dev *pcdev)
884 {
885 	int i;
886 
887 	for (i = 0; i < pcdev->channels; i++) {
888 		dev_dbg(pcdev_to_dev(pcdev),
889 			"%s (channel=%d)\n", __func__, i);
890 		dmaengine_terminate_all(pcdev->dma_chans[i]);
891 	}
892 }
893 
pxa_dma_add_tail_buf(struct pxa_camera_dev * pcdev,struct pxa_buffer * buf)894 static void pxa_dma_add_tail_buf(struct pxa_camera_dev *pcdev,
895 				 struct pxa_buffer *buf)
896 {
897 	int i;
898 
899 	for (i = 0; i < pcdev->channels; i++) {
900 		buf->cookie[i] = dmaengine_submit(buf->descs[i]);
901 		dev_dbg(pcdev_to_dev(pcdev),
902 			"%s (channel=%d) : submit vb=%p cookie=%d\n",
903 			__func__, i, buf, buf->descs[i]->cookie);
904 	}
905 }
906 
907 /**
908  * pxa_camera_start_capture - start video capturing
909  * @pcdev: camera device
910  *
911  * Launch capturing. DMA channels should not be active yet. They should get
912  * activated at the end of frame interrupt, to capture only whole frames, and
913  * never begin the capture of a partial frame.
914  */
pxa_camera_start_capture(struct pxa_camera_dev * pcdev)915 static void pxa_camera_start_capture(struct pxa_camera_dev *pcdev)
916 {
917 	unsigned long cicr0;
918 
919 	dev_dbg(pcdev_to_dev(pcdev), "%s\n", __func__);
920 	__raw_writel(__raw_readl(pcdev->base + CISR), pcdev->base + CISR);
921 	/* Enable End-Of-Frame Interrupt */
922 	cicr0 = __raw_readl(pcdev->base + CICR0) | CICR0_ENB;
923 	cicr0 &= ~CICR0_EOFM;
924 	__raw_writel(cicr0, pcdev->base + CICR0);
925 }
926 
pxa_camera_stop_capture(struct pxa_camera_dev * pcdev)927 static void pxa_camera_stop_capture(struct pxa_camera_dev *pcdev)
928 {
929 	unsigned long cicr0;
930 
931 	pxa_dma_stop_channels(pcdev);
932 
933 	cicr0 = __raw_readl(pcdev->base + CICR0) & ~CICR0_ENB;
934 	__raw_writel(cicr0, pcdev->base + CICR0);
935 
936 	pcdev->active = NULL;
937 	dev_dbg(pcdev_to_dev(pcdev), "%s\n", __func__);
938 }
939 
pxa_camera_wakeup(struct pxa_camera_dev * pcdev,struct pxa_buffer * buf,enum vb2_buffer_state state)940 static void pxa_camera_wakeup(struct pxa_camera_dev *pcdev,
941 			      struct pxa_buffer *buf,
942 			      enum vb2_buffer_state state)
943 {
944 	struct vb2_buffer *vb = &buf->vbuf.vb2_buf;
945 	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
946 
947 	/* _init is used to debug races, see comment in pxa_camera_reqbufs() */
948 	list_del_init(&buf->queue);
949 	vb->timestamp = ktime_get_ns();
950 	vbuf->sequence = pcdev->buf_sequence++;
951 	vbuf->field = V4L2_FIELD_NONE;
952 	vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
953 	dev_dbg(pcdev_to_dev(pcdev), "%s dequeued buffer (buf=0x%p)\n",
954 		__func__, buf);
955 
956 	if (list_empty(&pcdev->capture)) {
957 		pxa_camera_stop_capture(pcdev);
958 		return;
959 	}
960 
961 	pcdev->active = list_entry(pcdev->capture.next,
962 				   struct pxa_buffer, queue);
963 }
964 
965 /**
966  * pxa_camera_check_link_miss - check missed DMA linking
967  * @pcdev: camera device
968  * @last_submitted: an opaque DMA cookie for last submitted
969  * @last_issued: an opaque DMA cookie for last issued
970  *
971  * The DMA chaining is done with DMA running. This means a tiny temporal window
972  * remains, where a buffer is queued on the chain, while the chain is already
973  * stopped. This means the tailed buffer would never be transferred by DMA.
974  * This function restarts the capture for this corner case, where :
975  *  - DADR() == DADDR_STOP
976  *  - a video buffer is queued on the pcdev->capture list
977  *
978  * Please check the "DMA hot chaining timeslice issue" in
979  *   Documentation/driver-api/media/drivers/pxa_camera.rst
980  *
981  * Context: should only be called within the dma irq handler
982  */
pxa_camera_check_link_miss(struct pxa_camera_dev * pcdev,dma_cookie_t last_submitted,dma_cookie_t last_issued)983 static void pxa_camera_check_link_miss(struct pxa_camera_dev *pcdev,
984 				       dma_cookie_t last_submitted,
985 				       dma_cookie_t last_issued)
986 {
987 	bool is_dma_stopped = last_submitted != last_issued;
988 
989 	dev_dbg(pcdev_to_dev(pcdev),
990 		"%s : top queued buffer=%p, is_dma_stopped=%d\n",
991 		__func__, pcdev->active, is_dma_stopped);
992 
993 	if (pcdev->active && is_dma_stopped)
994 		pxa_camera_start_capture(pcdev);
995 }
996 
pxa_camera_dma_irq(struct pxa_camera_dev * pcdev,enum pxa_camera_active_dma act_dma)997 static void pxa_camera_dma_irq(struct pxa_camera_dev *pcdev,
998 			       enum pxa_camera_active_dma act_dma)
999 {
1000 	struct pxa_buffer *buf, *last_buf;
1001 	unsigned long flags;
1002 	u32 camera_status, overrun;
1003 	int chan;
1004 	enum dma_status last_status;
1005 	dma_cookie_t last_issued;
1006 
1007 	spin_lock_irqsave(&pcdev->lock, flags);
1008 
1009 	camera_status = __raw_readl(pcdev->base + CISR);
1010 	dev_dbg(pcdev_to_dev(pcdev), "camera dma irq, cisr=0x%x dma=%d\n",
1011 		camera_status, act_dma);
1012 	overrun = CISR_IFO_0;
1013 	if (pcdev->channels == 3)
1014 		overrun |= CISR_IFO_1 | CISR_IFO_2;
1015 
1016 	/*
1017 	 * pcdev->active should not be NULL in DMA irq handler.
1018 	 *
1019 	 * But there is one corner case : if capture was stopped due to an
1020 	 * overrun of channel 1, and at that same channel 2 was completed.
1021 	 *
1022 	 * When handling the overrun in DMA irq for channel 1, we'll stop the
1023 	 * capture and restart it (and thus set pcdev->active to NULL). But the
1024 	 * DMA irq handler will already be pending for channel 2. So on entering
1025 	 * the DMA irq handler for channel 2 there will be no active buffer, yet
1026 	 * that is normal.
1027 	 */
1028 	if (!pcdev->active)
1029 		goto out;
1030 
1031 	buf = pcdev->active;
1032 	WARN_ON(buf->inwork || list_empty(&buf->queue));
1033 
1034 	/*
1035 	 * It's normal if the last frame creates an overrun, as there
1036 	 * are no more DMA descriptors to fetch from QCI fifos
1037 	 */
1038 	switch (act_dma) {
1039 	case DMA_U:
1040 		chan = 1;
1041 		break;
1042 	case DMA_V:
1043 		chan = 2;
1044 		break;
1045 	default:
1046 		chan = 0;
1047 		break;
1048 	}
1049 	last_buf = list_entry(pcdev->capture.prev,
1050 			      struct pxa_buffer, queue);
1051 	last_status = dma_async_is_tx_complete(pcdev->dma_chans[chan],
1052 					       last_buf->cookie[chan],
1053 					       NULL, &last_issued);
1054 	if (camera_status & overrun &&
1055 	    last_status != DMA_COMPLETE) {
1056 		dev_dbg(pcdev_to_dev(pcdev), "FIFO overrun! CISR: %x\n",
1057 			camera_status);
1058 		pxa_camera_stop_capture(pcdev);
1059 		list_for_each_entry(buf, &pcdev->capture, queue)
1060 			pxa_dma_add_tail_buf(pcdev, buf);
1061 		pxa_camera_start_capture(pcdev);
1062 		goto out;
1063 	}
1064 	buf->active_dma &= ~act_dma;
1065 	if (!buf->active_dma) {
1066 		pxa_camera_wakeup(pcdev, buf, VB2_BUF_STATE_DONE);
1067 		pxa_camera_check_link_miss(pcdev, last_buf->cookie[chan],
1068 					   last_issued);
1069 	}
1070 
1071 out:
1072 	spin_unlock_irqrestore(&pcdev->lock, flags);
1073 }
1074 
mclk_get_divisor(struct platform_device * pdev,struct pxa_camera_dev * pcdev)1075 static u32 mclk_get_divisor(struct platform_device *pdev,
1076 			    struct pxa_camera_dev *pcdev)
1077 {
1078 	unsigned long mclk = pcdev->mclk;
1079 	u32 div;
1080 	unsigned long lcdclk;
1081 
1082 	lcdclk = clk_get_rate(pcdev->clk);
1083 	pcdev->ciclk = lcdclk;
1084 
1085 	/* mclk <= ciclk / 4 (27.4.2) */
1086 	if (mclk > lcdclk / 4) {
1087 		mclk = lcdclk / 4;
1088 		dev_warn(&pdev->dev,
1089 			 "Limiting master clock to %lu\n", mclk);
1090 	}
1091 
1092 	/* We verify mclk != 0, so if anyone breaks it, here comes their Oops */
1093 	div = (lcdclk + 2 * mclk - 1) / (2 * mclk) - 1;
1094 
1095 	/* If we're not supplying MCLK, leave it at 0 */
1096 	if (pcdev->platform_flags & PXA_CAMERA_MCLK_EN)
1097 		pcdev->mclk = lcdclk / (2 * (div + 1));
1098 
1099 	dev_dbg(&pdev->dev, "LCD clock %luHz, target freq %luHz, divisor %u\n",
1100 		lcdclk, mclk, div);
1101 
1102 	return div;
1103 }
1104 
recalculate_fifo_timeout(struct pxa_camera_dev * pcdev,unsigned long pclk)1105 static void recalculate_fifo_timeout(struct pxa_camera_dev *pcdev,
1106 				     unsigned long pclk)
1107 {
1108 	/* We want a timeout > 1 pixel time, not ">=" */
1109 	u32 ciclk_per_pixel = pcdev->ciclk / pclk + 1;
1110 
1111 	__raw_writel(ciclk_per_pixel, pcdev->base + CITOR);
1112 }
1113 
pxa_camera_activate(struct pxa_camera_dev * pcdev)1114 static void pxa_camera_activate(struct pxa_camera_dev *pcdev)
1115 {
1116 	u32 cicr4 = 0;
1117 
1118 	/* disable all interrupts */
1119 	__raw_writel(0x3ff, pcdev->base + CICR0);
1120 
1121 	if (pcdev->platform_flags & PXA_CAMERA_PCLK_EN)
1122 		cicr4 |= CICR4_PCLK_EN;
1123 	if (pcdev->platform_flags & PXA_CAMERA_MCLK_EN)
1124 		cicr4 |= CICR4_MCLK_EN;
1125 	if (pcdev->platform_flags & PXA_CAMERA_PCP)
1126 		cicr4 |= CICR4_PCP;
1127 	if (pcdev->platform_flags & PXA_CAMERA_HSP)
1128 		cicr4 |= CICR4_HSP;
1129 	if (pcdev->platform_flags & PXA_CAMERA_VSP)
1130 		cicr4 |= CICR4_VSP;
1131 
1132 	__raw_writel(pcdev->mclk_divisor | cicr4, pcdev->base + CICR4);
1133 
1134 	if (pcdev->platform_flags & PXA_CAMERA_MCLK_EN)
1135 		/* Initialise the timeout under the assumption pclk = mclk */
1136 		recalculate_fifo_timeout(pcdev, pcdev->mclk);
1137 	else
1138 		/* "Safe default" - 13MHz */
1139 		recalculate_fifo_timeout(pcdev, 13000000);
1140 
1141 	clk_prepare_enable(pcdev->clk);
1142 }
1143 
pxa_camera_deactivate(struct pxa_camera_dev * pcdev)1144 static void pxa_camera_deactivate(struct pxa_camera_dev *pcdev)
1145 {
1146 	clk_disable_unprepare(pcdev->clk);
1147 }
1148 
pxa_camera_eof(struct tasklet_struct * t)1149 static void pxa_camera_eof(struct tasklet_struct *t)
1150 {
1151 	struct pxa_camera_dev *pcdev = from_tasklet(pcdev, t, task_eof);
1152 	unsigned long cifr;
1153 	struct pxa_buffer *buf;
1154 
1155 	dev_dbg(pcdev_to_dev(pcdev),
1156 		"Camera interrupt status 0x%x\n",
1157 		__raw_readl(pcdev->base + CISR));
1158 
1159 	/* Reset the FIFOs */
1160 	cifr = __raw_readl(pcdev->base + CIFR) | CIFR_RESET_F;
1161 	__raw_writel(cifr, pcdev->base + CIFR);
1162 
1163 	pcdev->active = list_first_entry(&pcdev->capture,
1164 					 struct pxa_buffer, queue);
1165 	buf = pcdev->active;
1166 	pxa_video_buf_set_actdma(pcdev, buf);
1167 
1168 	pxa_dma_start_channels(pcdev);
1169 }
1170 
pxa_camera_irq(int irq,void * data)1171 static irqreturn_t pxa_camera_irq(int irq, void *data)
1172 {
1173 	struct pxa_camera_dev *pcdev = data;
1174 	unsigned long status, cicr0;
1175 
1176 	status = __raw_readl(pcdev->base + CISR);
1177 	dev_dbg(pcdev_to_dev(pcdev),
1178 		"Camera interrupt status 0x%lx\n", status);
1179 
1180 	if (!status)
1181 		return IRQ_NONE;
1182 
1183 	__raw_writel(status, pcdev->base + CISR);
1184 
1185 	if (status & CISR_EOF) {
1186 		cicr0 = __raw_readl(pcdev->base + CICR0) | CICR0_EOFM;
1187 		__raw_writel(cicr0, pcdev->base + CICR0);
1188 		tasklet_schedule(&pcdev->task_eof);
1189 	}
1190 
1191 	return IRQ_HANDLED;
1192 }
1193 
pxa_camera_setup_cicr(struct pxa_camera_dev * pcdev,unsigned long flags,__u32 pixfmt)1194 static void pxa_camera_setup_cicr(struct pxa_camera_dev *pcdev,
1195 				  unsigned long flags, __u32 pixfmt)
1196 {
1197 	unsigned long dw, bpp;
1198 	u32 cicr0, cicr1, cicr2, cicr3, cicr4 = 0, y_skip_top;
1199 	int ret = sensor_call(pcdev, sensor, g_skip_top_lines, &y_skip_top);
1200 
1201 	if (ret < 0)
1202 		y_skip_top = 0;
1203 
1204 	/*
1205 	 * Datawidth is now guaranteed to be equal to one of the three values.
1206 	 * We fix bit-per-pixel equal to data-width...
1207 	 */
1208 	switch (pcdev->current_fmt->host_fmt->bits_per_sample) {
1209 	case 10:
1210 		dw = 4;
1211 		bpp = 0x40;
1212 		break;
1213 	case 9:
1214 		dw = 3;
1215 		bpp = 0x20;
1216 		break;
1217 	default:
1218 		/*
1219 		 * Actually it can only be 8 now,
1220 		 * default is just to silence compiler warnings
1221 		 */
1222 	case 8:
1223 		dw = 2;
1224 		bpp = 0;
1225 	}
1226 
1227 	if (pcdev->platform_flags & PXA_CAMERA_PCLK_EN)
1228 		cicr4 |= CICR4_PCLK_EN;
1229 	if (pcdev->platform_flags & PXA_CAMERA_MCLK_EN)
1230 		cicr4 |= CICR4_MCLK_EN;
1231 	if (flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)
1232 		cicr4 |= CICR4_PCP;
1233 	if (flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)
1234 		cicr4 |= CICR4_HSP;
1235 	if (flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
1236 		cicr4 |= CICR4_VSP;
1237 
1238 	cicr0 = __raw_readl(pcdev->base + CICR0);
1239 	if (cicr0 & CICR0_ENB)
1240 		__raw_writel(cicr0 & ~CICR0_ENB, pcdev->base + CICR0);
1241 
1242 	cicr1 = CICR1_PPL_VAL(pcdev->current_pix.width - 1) | bpp | dw;
1243 
1244 	switch (pixfmt) {
1245 	case V4L2_PIX_FMT_YUV422P:
1246 		pcdev->channels = 3;
1247 		cicr1 |= CICR1_YCBCR_F;
1248 		/*
1249 		 * Normally, pxa bus wants as input UYVY format. We allow all
1250 		 * reorderings of the YUV422 format, as no processing is done,
1251 		 * and the YUV stream is just passed through without any
1252 		 * transformation. Note that UYVY is the only format that
1253 		 * should be used if pxa framebuffer Overlay2 is used.
1254 		 */
1255 		fallthrough;
1256 	case V4L2_PIX_FMT_UYVY:
1257 	case V4L2_PIX_FMT_VYUY:
1258 	case V4L2_PIX_FMT_YUYV:
1259 	case V4L2_PIX_FMT_YVYU:
1260 		cicr1 |= CICR1_COLOR_SP_VAL(2);
1261 		break;
1262 	case V4L2_PIX_FMT_RGB555:
1263 		cicr1 |= CICR1_RGB_BPP_VAL(1) | CICR1_RGBT_CONV_VAL(2) |
1264 			CICR1_TBIT | CICR1_COLOR_SP_VAL(1);
1265 		break;
1266 	case V4L2_PIX_FMT_RGB565:
1267 		cicr1 |= CICR1_COLOR_SP_VAL(1) | CICR1_RGB_BPP_VAL(2);
1268 		break;
1269 	}
1270 
1271 	cicr2 = 0;
1272 	cicr3 = CICR3_LPF_VAL(pcdev->current_pix.height - 1) |
1273 		CICR3_BFW_VAL(min((u32)255, y_skip_top));
1274 	cicr4 |= pcdev->mclk_divisor;
1275 
1276 	__raw_writel(cicr1, pcdev->base + CICR1);
1277 	__raw_writel(cicr2, pcdev->base + CICR2);
1278 	__raw_writel(cicr3, pcdev->base + CICR3);
1279 	__raw_writel(cicr4, pcdev->base + CICR4);
1280 
1281 	/* CIF interrupts are not used, only DMA */
1282 	cicr0 = (cicr0 & CICR0_ENB) | (pcdev->platform_flags & PXA_CAMERA_MASTER ?
1283 		CICR0_SIM_MP : (CICR0_SL_CAP_EN | CICR0_SIM_SP));
1284 	cicr0 |= CICR0_DMAEN | CICR0_IRQ_MASK;
1285 	__raw_writel(cicr0, pcdev->base + CICR0);
1286 }
1287 
1288 /*
1289  * Videobuf2 section
1290  */
pxa_buffer_cleanup(struct pxa_buffer * buf)1291 static void pxa_buffer_cleanup(struct pxa_buffer *buf)
1292 {
1293 	int i;
1294 
1295 	for (i = 0; i < 3 && buf->descs[i]; i++) {
1296 		dmaengine_desc_free(buf->descs[i]);
1297 		kfree(buf->sg[i]);
1298 		buf->descs[i] = NULL;
1299 		buf->sg[i] = NULL;
1300 		buf->sg_len[i] = 0;
1301 		buf->plane_sizes[i] = 0;
1302 	}
1303 	buf->nb_planes = 0;
1304 }
1305 
pxa_buffer_init(struct pxa_camera_dev * pcdev,struct pxa_buffer * buf)1306 static int pxa_buffer_init(struct pxa_camera_dev *pcdev,
1307 			   struct pxa_buffer *buf)
1308 {
1309 	struct vb2_buffer *vb = &buf->vbuf.vb2_buf;
1310 	struct sg_table *sgt = vb2_dma_sg_plane_desc(vb, 0);
1311 	int nb_channels = pcdev->channels;
1312 	int i, ret = 0;
1313 	unsigned long size = vb2_plane_size(vb, 0);
1314 
1315 	switch (nb_channels) {
1316 	case 1:
1317 		buf->plane_sizes[0] = size;
1318 		break;
1319 	case 3:
1320 		buf->plane_sizes[0] = size / 2;
1321 		buf->plane_sizes[1] = size / 4;
1322 		buf->plane_sizes[2] = size / 4;
1323 		break;
1324 	default:
1325 		return -EINVAL;
1326 	}
1327 	buf->nb_planes = nb_channels;
1328 
1329 	ret = sg_split(sgt->sgl, sgt->nents, 0, nb_channels,
1330 		       buf->plane_sizes, buf->sg, buf->sg_len, GFP_KERNEL);
1331 	if (ret < 0) {
1332 		dev_err(pcdev_to_dev(pcdev),
1333 			"sg_split failed: %d\n", ret);
1334 		return ret;
1335 	}
1336 	for (i = 0; i < nb_channels; i++) {
1337 		ret = pxa_init_dma_channel(pcdev, buf, i,
1338 					   buf->sg[i], buf->sg_len[i]);
1339 		if (ret) {
1340 			pxa_buffer_cleanup(buf);
1341 			return ret;
1342 		}
1343 	}
1344 	INIT_LIST_HEAD(&buf->queue);
1345 
1346 	return ret;
1347 }
1348 
pxac_vb2_cleanup(struct vb2_buffer * vb)1349 static void pxac_vb2_cleanup(struct vb2_buffer *vb)
1350 {
1351 	struct pxa_buffer *buf = vb2_to_pxa_buffer(vb);
1352 	struct pxa_camera_dev *pcdev = vb2_get_drv_priv(vb->vb2_queue);
1353 
1354 	dev_dbg(pcdev_to_dev(pcdev),
1355 		 "%s(vb=%p)\n", __func__, vb);
1356 	pxa_buffer_cleanup(buf);
1357 }
1358 
pxac_vb2_queue(struct vb2_buffer * vb)1359 static void pxac_vb2_queue(struct vb2_buffer *vb)
1360 {
1361 	struct pxa_buffer *buf = vb2_to_pxa_buffer(vb);
1362 	struct pxa_camera_dev *pcdev = vb2_get_drv_priv(vb->vb2_queue);
1363 
1364 	dev_dbg(pcdev_to_dev(pcdev),
1365 		 "%s(vb=%p) nb_channels=%d size=%lu active=%p\n",
1366 		__func__, vb, pcdev->channels, vb2_get_plane_payload(vb, 0),
1367 		pcdev->active);
1368 
1369 	list_add_tail(&buf->queue, &pcdev->capture);
1370 
1371 	pxa_dma_add_tail_buf(pcdev, buf);
1372 }
1373 
1374 /*
1375  * Please check the DMA prepared buffer structure in :
1376  *   Documentation/driver-api/media/drivers/pxa_camera.rst
1377  * Please check also in pxa_camera_check_link_miss() to understand why DMA chain
1378  * modification while DMA chain is running will work anyway.
1379  */
pxac_vb2_prepare(struct vb2_buffer * vb)1380 static int pxac_vb2_prepare(struct vb2_buffer *vb)
1381 {
1382 	struct pxa_camera_dev *pcdev = vb2_get_drv_priv(vb->vb2_queue);
1383 	struct pxa_buffer *buf = vb2_to_pxa_buffer(vb);
1384 	int ret = 0;
1385 #ifdef DEBUG
1386 	int i;
1387 #endif
1388 
1389 	switch (pcdev->channels) {
1390 	case 1:
1391 	case 3:
1392 		vb2_set_plane_payload(vb, 0, pcdev->current_pix.sizeimage);
1393 		break;
1394 	default:
1395 		return -EINVAL;
1396 	}
1397 
1398 	dev_dbg(pcdev_to_dev(pcdev),
1399 		 "%s (vb=%p) nb_channels=%d size=%lu\n",
1400 		__func__, vb, pcdev->channels, vb2_get_plane_payload(vb, 0));
1401 
1402 	WARN_ON(!pcdev->current_fmt);
1403 
1404 #ifdef DEBUG
1405 	/*
1406 	 * This can be useful if you want to see if we actually fill
1407 	 * the buffer with something
1408 	 */
1409 	for (i = 0; i < vb->num_planes; i++)
1410 		memset((void *)vb2_plane_vaddr(vb, i),
1411 		       0xaa, vb2_get_plane_payload(vb, i));
1412 #endif
1413 
1414 	/*
1415 	 * I think, in buf_prepare you only have to protect global data,
1416 	 * the actual buffer is yours
1417 	 */
1418 	buf->inwork = 0;
1419 	pxa_video_buf_set_actdma(pcdev, buf);
1420 
1421 	return ret;
1422 }
1423 
pxac_vb2_init(struct vb2_buffer * vb)1424 static int pxac_vb2_init(struct vb2_buffer *vb)
1425 {
1426 	struct pxa_camera_dev *pcdev = vb2_get_drv_priv(vb->vb2_queue);
1427 	struct pxa_buffer *buf = vb2_to_pxa_buffer(vb);
1428 
1429 	dev_dbg(pcdev_to_dev(pcdev),
1430 		 "%s(nb_channels=%d)\n",
1431 		__func__, pcdev->channels);
1432 
1433 	return pxa_buffer_init(pcdev, buf);
1434 }
1435 
pxac_vb2_queue_setup(struct vb2_queue * vq,unsigned int * nbufs,unsigned int * num_planes,unsigned int sizes[],struct device * alloc_devs[])1436 static int pxac_vb2_queue_setup(struct vb2_queue *vq,
1437 				unsigned int *nbufs,
1438 				unsigned int *num_planes, unsigned int sizes[],
1439 				struct device *alloc_devs[])
1440 {
1441 	struct pxa_camera_dev *pcdev = vb2_get_drv_priv(vq);
1442 	int size = pcdev->current_pix.sizeimage;
1443 
1444 	dev_dbg(pcdev_to_dev(pcdev),
1445 		 "%s(vq=%p nbufs=%d num_planes=%d size=%d)\n",
1446 		__func__, vq, *nbufs, *num_planes, size);
1447 	/*
1448 	 * Called from VIDIOC_REQBUFS or in compatibility mode For YUV422P
1449 	 * format, even if there are 3 planes Y, U and V, we reply there is only
1450 	 * one plane, containing Y, U and V data, one after the other.
1451 	 */
1452 	if (*num_planes)
1453 		return sizes[0] < size ? -EINVAL : 0;
1454 
1455 	*num_planes = 1;
1456 	switch (pcdev->channels) {
1457 	case 1:
1458 	case 3:
1459 		sizes[0] = size;
1460 		break;
1461 	default:
1462 		return -EINVAL;
1463 	}
1464 
1465 	if (!*nbufs)
1466 		*nbufs = 1;
1467 
1468 	return 0;
1469 }
1470 
pxac_vb2_start_streaming(struct vb2_queue * vq,unsigned int count)1471 static int pxac_vb2_start_streaming(struct vb2_queue *vq, unsigned int count)
1472 {
1473 	struct pxa_camera_dev *pcdev = vb2_get_drv_priv(vq);
1474 
1475 	dev_dbg(pcdev_to_dev(pcdev), "%s(count=%d) active=%p\n",
1476 		__func__, count, pcdev->active);
1477 
1478 	pcdev->buf_sequence = 0;
1479 	if (!pcdev->active)
1480 		pxa_camera_start_capture(pcdev);
1481 
1482 	return 0;
1483 }
1484 
pxac_vb2_stop_streaming(struct vb2_queue * vq)1485 static void pxac_vb2_stop_streaming(struct vb2_queue *vq)
1486 {
1487 	struct pxa_camera_dev *pcdev = vb2_get_drv_priv(vq);
1488 	struct pxa_buffer *buf, *tmp;
1489 
1490 	dev_dbg(pcdev_to_dev(pcdev), "%s active=%p\n",
1491 		__func__, pcdev->active);
1492 	pxa_camera_stop_capture(pcdev);
1493 
1494 	list_for_each_entry_safe(buf, tmp, &pcdev->capture, queue)
1495 		pxa_camera_wakeup(pcdev, buf, VB2_BUF_STATE_ERROR);
1496 }
1497 
1498 static const struct vb2_ops pxac_vb2_ops = {
1499 	.queue_setup		= pxac_vb2_queue_setup,
1500 	.buf_init		= pxac_vb2_init,
1501 	.buf_prepare		= pxac_vb2_prepare,
1502 	.buf_queue		= pxac_vb2_queue,
1503 	.buf_cleanup		= pxac_vb2_cleanup,
1504 	.start_streaming	= pxac_vb2_start_streaming,
1505 	.stop_streaming		= pxac_vb2_stop_streaming,
1506 	.wait_prepare		= vb2_ops_wait_prepare,
1507 	.wait_finish		= vb2_ops_wait_finish,
1508 };
1509 
pxa_camera_init_videobuf2(struct pxa_camera_dev * pcdev)1510 static int pxa_camera_init_videobuf2(struct pxa_camera_dev *pcdev)
1511 {
1512 	int ret;
1513 	struct vb2_queue *vq = &pcdev->vb2_vq;
1514 
1515 	memset(vq, 0, sizeof(*vq));
1516 	vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1517 	vq->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
1518 	vq->drv_priv = pcdev;
1519 	vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
1520 	vq->buf_struct_size = sizeof(struct pxa_buffer);
1521 	vq->dev = pcdev->v4l2_dev.dev;
1522 
1523 	vq->ops = &pxac_vb2_ops;
1524 	vq->mem_ops = &vb2_dma_sg_memops;
1525 	vq->lock = &pcdev->mlock;
1526 
1527 	ret = vb2_queue_init(vq);
1528 	dev_dbg(pcdev_to_dev(pcdev),
1529 		 "vb2_queue_init(vq=%p): %d\n", vq, ret);
1530 
1531 	return ret;
1532 }
1533 
1534 /*
1535  * Video ioctls section
1536  */
pxa_camera_set_bus_param(struct pxa_camera_dev * pcdev)1537 static int pxa_camera_set_bus_param(struct pxa_camera_dev *pcdev)
1538 {
1539 	unsigned int bus_width = pcdev->current_fmt->host_fmt->bits_per_sample;
1540 	struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
1541 	u32 pixfmt = pcdev->current_fmt->host_fmt->fourcc;
1542 	int mbus_config;
1543 	int ret;
1544 
1545 	if (!((1 << (bus_width - 1)) & pcdev->width_flags)) {
1546 		dev_err(pcdev_to_dev(pcdev), "Unsupported bus width %u",
1547 			bus_width);
1548 		return -EINVAL;
1549 	}
1550 
1551 	pcdev->channels = 1;
1552 
1553 	/* Make choices, based on platform preferences */
1554 	mbus_config = 0;
1555 	if (pcdev->platform_flags & PXA_CAMERA_MASTER)
1556 		mbus_config |= V4L2_MBUS_MASTER;
1557 	else
1558 		mbus_config |= V4L2_MBUS_SLAVE;
1559 
1560 	if (pcdev->platform_flags & PXA_CAMERA_HSP)
1561 		mbus_config |= V4L2_MBUS_HSYNC_ACTIVE_HIGH;
1562 	else
1563 		mbus_config |= V4L2_MBUS_HSYNC_ACTIVE_LOW;
1564 
1565 	if (pcdev->platform_flags & PXA_CAMERA_VSP)
1566 		mbus_config |= V4L2_MBUS_VSYNC_ACTIVE_HIGH;
1567 	else
1568 		mbus_config |= V4L2_MBUS_VSYNC_ACTIVE_LOW;
1569 
1570 	if (pcdev->platform_flags & PXA_CAMERA_PCP)
1571 		mbus_config |= V4L2_MBUS_PCLK_SAMPLE_RISING;
1572 	else
1573 		mbus_config |= V4L2_MBUS_PCLK_SAMPLE_FALLING;
1574 	mbus_config |= V4L2_MBUS_DATA_ACTIVE_HIGH;
1575 
1576 	ret = sensor_call(pcdev, pad, get_mbus_config, 0, &cfg);
1577 	if (ret < 0 && ret != -ENOIOCTLCMD) {
1578 		dev_err(pcdev_to_dev(pcdev),
1579 			"Failed to call get_mbus_config: %d\n", ret);
1580 		return ret;
1581 	}
1582 
1583 	/*
1584 	 * If the media bus configuration of the sensor differs, make sure it
1585 	 * is supported by the platform.
1586 	 *
1587 	 * PXA does not support V4L2_MBUS_DATA_ACTIVE_LOW and the bus mastering
1588 	 * roles should match.
1589 	 */
1590 	if (cfg.bus.parallel.flags != mbus_config) {
1591 		unsigned int pxa_mbus_role = mbus_config & (V4L2_MBUS_MASTER |
1592 							    V4L2_MBUS_SLAVE);
1593 		unsigned int flags = cfg.bus.parallel.flags;
1594 
1595 		if (pxa_mbus_role != (flags & (V4L2_MBUS_MASTER |
1596 					       V4L2_MBUS_SLAVE))) {
1597 			dev_err(pcdev_to_dev(pcdev),
1598 				"Unsupported mbus configuration: bus mastering\n");
1599 			return -EINVAL;
1600 		}
1601 
1602 		if (flags & V4L2_MBUS_DATA_ACTIVE_LOW) {
1603 			dev_err(pcdev_to_dev(pcdev),
1604 				"Unsupported mbus configuration: DATA_ACTIVE_LOW\n");
1605 			return -EINVAL;
1606 		}
1607 	}
1608 
1609 	pxa_camera_setup_cicr(pcdev, cfg.bus.parallel.flags, pixfmt);
1610 
1611 	return 0;
1612 }
1613 
1614 static const struct pxa_mbus_pixelfmt pxa_camera_formats[] = {
1615 	{
1616 		.fourcc			= V4L2_PIX_FMT_YUV422P,
1617 		.name			= "Planar YUV422 16 bit",
1618 		.bits_per_sample	= 8,
1619 		.packing		= PXA_MBUS_PACKING_2X8_PADHI,
1620 		.order			= PXA_MBUS_ORDER_LE,
1621 		.layout			= PXA_MBUS_LAYOUT_PLANAR_2Y_U_V,
1622 	},
1623 };
1624 
1625 /* This will be corrected as we get more formats */
pxa_camera_packing_supported(const struct pxa_mbus_pixelfmt * fmt)1626 static bool pxa_camera_packing_supported(const struct pxa_mbus_pixelfmt *fmt)
1627 {
1628 	return	fmt->packing == PXA_MBUS_PACKING_NONE ||
1629 		(fmt->bits_per_sample == 8 &&
1630 		 fmt->packing == PXA_MBUS_PACKING_2X8_PADHI) ||
1631 		(fmt->bits_per_sample > 8 &&
1632 		 fmt->packing == PXA_MBUS_PACKING_EXTEND16);
1633 }
1634 
pxa_camera_get_formats(struct v4l2_device * v4l2_dev,unsigned int idx,struct pxa_camera_format_xlate * xlate)1635 static int pxa_camera_get_formats(struct v4l2_device *v4l2_dev,
1636 				  unsigned int idx,
1637 				  struct pxa_camera_format_xlate *xlate)
1638 {
1639 	struct pxa_camera_dev *pcdev = v4l2_dev_to_pcdev(v4l2_dev);
1640 	int formats = 0, ret;
1641 	struct v4l2_subdev_mbus_code_enum code = {
1642 		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
1643 		.index = idx,
1644 	};
1645 	const struct pxa_mbus_pixelfmt *fmt;
1646 
1647 	ret = sensor_call(pcdev, pad, enum_mbus_code, NULL, &code);
1648 	if (ret < 0)
1649 		/* No more formats */
1650 		return 0;
1651 
1652 	fmt = pxa_mbus_get_fmtdesc(code.code);
1653 	if (!fmt) {
1654 		dev_err(pcdev_to_dev(pcdev),
1655 			"Invalid format code #%u: %d\n", idx, code.code);
1656 		return 0;
1657 	}
1658 
1659 	switch (code.code) {
1660 	case MEDIA_BUS_FMT_UYVY8_2X8:
1661 		formats++;
1662 		if (xlate) {
1663 			xlate->host_fmt	= &pxa_camera_formats[0];
1664 			xlate->code	= code.code;
1665 			xlate++;
1666 			dev_dbg(pcdev_to_dev(pcdev),
1667 				"Providing format %s using code %d\n",
1668 				pxa_camera_formats[0].name, code.code);
1669 		}
1670 		fallthrough;
1671 	case MEDIA_BUS_FMT_VYUY8_2X8:
1672 	case MEDIA_BUS_FMT_YUYV8_2X8:
1673 	case MEDIA_BUS_FMT_YVYU8_2X8:
1674 	case MEDIA_BUS_FMT_RGB565_2X8_LE:
1675 	case MEDIA_BUS_FMT_RGB555_2X8_PADHI_LE:
1676 		if (xlate)
1677 			dev_dbg(pcdev_to_dev(pcdev),
1678 				"Providing format %s packed\n",
1679 				fmt->name);
1680 		break;
1681 	default:
1682 		if (!pxa_camera_packing_supported(fmt))
1683 			return 0;
1684 		if (xlate)
1685 			dev_dbg(pcdev_to_dev(pcdev),
1686 				"Providing format %s in pass-through mode\n",
1687 				fmt->name);
1688 		break;
1689 	}
1690 
1691 	/* Generic pass-through */
1692 	formats++;
1693 	if (xlate) {
1694 		xlate->host_fmt	= fmt;
1695 		xlate->code	= code.code;
1696 		xlate++;
1697 	}
1698 
1699 	return formats;
1700 }
1701 
pxa_camera_build_formats(struct pxa_camera_dev * pcdev)1702 static int pxa_camera_build_formats(struct pxa_camera_dev *pcdev)
1703 {
1704 	struct pxa_camera_format_xlate *xlate;
1705 
1706 	xlate = pxa_mbus_build_fmts_xlate(&pcdev->v4l2_dev, pcdev->sensor,
1707 					  pxa_camera_get_formats);
1708 	if (IS_ERR(xlate))
1709 		return PTR_ERR(xlate);
1710 
1711 	pcdev->user_formats = xlate;
1712 	return 0;
1713 }
1714 
pxa_camera_destroy_formats(struct pxa_camera_dev * pcdev)1715 static void pxa_camera_destroy_formats(struct pxa_camera_dev *pcdev)
1716 {
1717 	kfree(pcdev->user_formats);
1718 }
1719 
pxa_camera_check_frame(u32 width,u32 height)1720 static int pxa_camera_check_frame(u32 width, u32 height)
1721 {
1722 	/* limit to pxa hardware capabilities */
1723 	return height < 32 || height > 2048 || width < 48 || width > 2048 ||
1724 		(width & 0x01);
1725 }
1726 
1727 #ifdef CONFIG_VIDEO_ADV_DEBUG
pxac_vidioc_g_register(struct file * file,void * priv,struct v4l2_dbg_register * reg)1728 static int pxac_vidioc_g_register(struct file *file, void *priv,
1729 				  struct v4l2_dbg_register *reg)
1730 {
1731 	struct pxa_camera_dev *pcdev = video_drvdata(file);
1732 
1733 	if (reg->reg > CIBR2)
1734 		return -ERANGE;
1735 
1736 	reg->val = __raw_readl(pcdev->base + reg->reg);
1737 	reg->size = sizeof(__u32);
1738 	return 0;
1739 }
1740 
pxac_vidioc_s_register(struct file * file,void * priv,const struct v4l2_dbg_register * reg)1741 static int pxac_vidioc_s_register(struct file *file, void *priv,
1742 				  const struct v4l2_dbg_register *reg)
1743 {
1744 	struct pxa_camera_dev *pcdev = video_drvdata(file);
1745 
1746 	if (reg->reg > CIBR2)
1747 		return -ERANGE;
1748 	if (reg->size != sizeof(__u32))
1749 		return -EINVAL;
1750 	__raw_writel(reg->val, pcdev->base + reg->reg);
1751 	return 0;
1752 }
1753 #endif
1754 
pxac_vidioc_enum_fmt_vid_cap(struct file * filp,void * priv,struct v4l2_fmtdesc * f)1755 static int pxac_vidioc_enum_fmt_vid_cap(struct file *filp, void  *priv,
1756 					struct v4l2_fmtdesc *f)
1757 {
1758 	struct pxa_camera_dev *pcdev = video_drvdata(filp);
1759 	const struct pxa_mbus_pixelfmt *format;
1760 	unsigned int idx;
1761 
1762 	for (idx = 0; pcdev->user_formats[idx].code; idx++);
1763 	if (f->index >= idx)
1764 		return -EINVAL;
1765 
1766 	format = pcdev->user_formats[f->index].host_fmt;
1767 	f->pixelformat = format->fourcc;
1768 	return 0;
1769 }
1770 
pxac_vidioc_g_fmt_vid_cap(struct file * filp,void * priv,struct v4l2_format * f)1771 static int pxac_vidioc_g_fmt_vid_cap(struct file *filp, void *priv,
1772 				    struct v4l2_format *f)
1773 {
1774 	struct pxa_camera_dev *pcdev = video_drvdata(filp);
1775 	struct v4l2_pix_format *pix = &f->fmt.pix;
1776 
1777 	pix->width		= pcdev->current_pix.width;
1778 	pix->height		= pcdev->current_pix.height;
1779 	pix->bytesperline	= pcdev->current_pix.bytesperline;
1780 	pix->sizeimage		= pcdev->current_pix.sizeimage;
1781 	pix->field		= pcdev->current_pix.field;
1782 	pix->pixelformat	= pcdev->current_fmt->host_fmt->fourcc;
1783 	pix->colorspace		= pcdev->current_pix.colorspace;
1784 	dev_dbg(pcdev_to_dev(pcdev), "current_fmt->fourcc: 0x%08x\n",
1785 		pcdev->current_fmt->host_fmt->fourcc);
1786 	return 0;
1787 }
1788 
pxac_vidioc_try_fmt_vid_cap(struct file * filp,void * priv,struct v4l2_format * f)1789 static int pxac_vidioc_try_fmt_vid_cap(struct file *filp, void *priv,
1790 				      struct v4l2_format *f)
1791 {
1792 	struct pxa_camera_dev *pcdev = video_drvdata(filp);
1793 	const struct pxa_camera_format_xlate *xlate;
1794 	struct v4l2_pix_format *pix = &f->fmt.pix;
1795 	struct v4l2_subdev_pad_config pad_cfg;
1796 	struct v4l2_subdev_state pad_state = {
1797 		.pads = &pad_cfg,
1798 	};
1799 	struct v4l2_subdev_format format = {
1800 		.which = V4L2_SUBDEV_FORMAT_TRY,
1801 	};
1802 	struct v4l2_mbus_framefmt *mf = &format.format;
1803 	__u32 pixfmt = pix->pixelformat;
1804 	int ret;
1805 
1806 	xlate = pxa_mbus_xlate_by_fourcc(pcdev->user_formats, pixfmt);
1807 	if (!xlate) {
1808 		dev_warn(pcdev_to_dev(pcdev), "Format %x not found\n", pixfmt);
1809 		return -EINVAL;
1810 	}
1811 
1812 	/*
1813 	 * Limit to pxa hardware capabilities.  YUV422P planar format requires
1814 	 * images size to be a multiple of 16 bytes.  If not, zeros will be
1815 	 * inserted between Y and U planes, and U and V planes, which violates
1816 	 * the YUV422P standard.
1817 	 */
1818 	v4l_bound_align_image(&pix->width, 48, 2048, 1,
1819 			      &pix->height, 32, 2048, 0,
1820 			      pixfmt == V4L2_PIX_FMT_YUV422P ? 4 : 0);
1821 
1822 	v4l2_fill_mbus_format(mf, pix, xlate->code);
1823 	ret = sensor_call(pcdev, pad, set_fmt, &pad_state, &format);
1824 	if (ret < 0)
1825 		return ret;
1826 
1827 	v4l2_fill_pix_format(pix, mf);
1828 
1829 	/* Only progressive video supported so far */
1830 	switch (mf->field) {
1831 	case V4L2_FIELD_ANY:
1832 	case V4L2_FIELD_NONE:
1833 		pix->field = V4L2_FIELD_NONE;
1834 		break;
1835 	default:
1836 		/* TODO: support interlaced at least in pass-through mode */
1837 		dev_err(pcdev_to_dev(pcdev), "Field type %d unsupported.\n",
1838 			mf->field);
1839 		return -EINVAL;
1840 	}
1841 
1842 	ret = pxa_mbus_bytes_per_line(pix->width, xlate->host_fmt);
1843 	if (ret < 0)
1844 		return ret;
1845 
1846 	pix->bytesperline = ret;
1847 	ret = pxa_mbus_image_size(xlate->host_fmt, pix->bytesperline,
1848 				  pix->height);
1849 	if (ret < 0)
1850 		return ret;
1851 
1852 	pix->sizeimage = ret;
1853 	return 0;
1854 }
1855 
pxac_vidioc_s_fmt_vid_cap(struct file * filp,void * priv,struct v4l2_format * f)1856 static int pxac_vidioc_s_fmt_vid_cap(struct file *filp, void *priv,
1857 				    struct v4l2_format *f)
1858 {
1859 	struct pxa_camera_dev *pcdev = video_drvdata(filp);
1860 	const struct pxa_camera_format_xlate *xlate;
1861 	struct v4l2_pix_format *pix = &f->fmt.pix;
1862 	struct v4l2_subdev_format format = {
1863 		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
1864 	};
1865 	unsigned long flags;
1866 	int ret, is_busy;
1867 
1868 	dev_dbg(pcdev_to_dev(pcdev),
1869 		"s_fmt_vid_cap(pix=%dx%d:%x)\n",
1870 		pix->width, pix->height, pix->pixelformat);
1871 
1872 	spin_lock_irqsave(&pcdev->lock, flags);
1873 	is_busy = pcdev->active || vb2_is_busy(&pcdev->vb2_vq);
1874 	spin_unlock_irqrestore(&pcdev->lock, flags);
1875 
1876 	if (is_busy)
1877 		return -EBUSY;
1878 
1879 	ret = pxac_vidioc_try_fmt_vid_cap(filp, priv, f);
1880 	if (ret)
1881 		return ret;
1882 
1883 	xlate = pxa_mbus_xlate_by_fourcc(pcdev->user_formats,
1884 					 pix->pixelformat);
1885 	v4l2_fill_mbus_format(&format.format, pix, xlate->code);
1886 	ret = sensor_call(pcdev, pad, set_fmt, NULL, &format);
1887 	if (ret < 0) {
1888 		dev_warn(pcdev_to_dev(pcdev),
1889 			 "Failed to configure for format %x\n",
1890 			 pix->pixelformat);
1891 	} else if (pxa_camera_check_frame(pix->width, pix->height)) {
1892 		dev_warn(pcdev_to_dev(pcdev),
1893 			 "Camera driver produced an unsupported frame %dx%d\n",
1894 			 pix->width, pix->height);
1895 		return -EINVAL;
1896 	}
1897 
1898 	pcdev->current_fmt = xlate;
1899 	pcdev->current_pix = *pix;
1900 
1901 	ret = pxa_camera_set_bus_param(pcdev);
1902 	return ret;
1903 }
1904 
pxac_vidioc_querycap(struct file * file,void * priv,struct v4l2_capability * cap)1905 static int pxac_vidioc_querycap(struct file *file, void *priv,
1906 				struct v4l2_capability *cap)
1907 {
1908 	strscpy(cap->bus_info, "platform:pxa-camera", sizeof(cap->bus_info));
1909 	strscpy(cap->driver, PXA_CAM_DRV_NAME, sizeof(cap->driver));
1910 	strscpy(cap->card, pxa_cam_driver_description, sizeof(cap->card));
1911 	return 0;
1912 }
1913 
pxac_vidioc_enum_input(struct file * file,void * priv,struct v4l2_input * i)1914 static int pxac_vidioc_enum_input(struct file *file, void *priv,
1915 				  struct v4l2_input *i)
1916 {
1917 	if (i->index > 0)
1918 		return -EINVAL;
1919 
1920 	i->type = V4L2_INPUT_TYPE_CAMERA;
1921 	strscpy(i->name, "Camera", sizeof(i->name));
1922 
1923 	return 0;
1924 }
1925 
pxac_vidioc_g_input(struct file * file,void * priv,unsigned int * i)1926 static int pxac_vidioc_g_input(struct file *file, void *priv, unsigned int *i)
1927 {
1928 	*i = 0;
1929 
1930 	return 0;
1931 }
1932 
pxac_vidioc_s_input(struct file * file,void * priv,unsigned int i)1933 static int pxac_vidioc_s_input(struct file *file, void *priv, unsigned int i)
1934 {
1935 	if (i > 0)
1936 		return -EINVAL;
1937 
1938 	return 0;
1939 }
1940 
pxac_sensor_set_power(struct pxa_camera_dev * pcdev,int on)1941 static int pxac_sensor_set_power(struct pxa_camera_dev *pcdev, int on)
1942 {
1943 	int ret;
1944 
1945 	ret = sensor_call(pcdev, core, s_power, on);
1946 	if (ret == -ENOIOCTLCMD)
1947 		ret = 0;
1948 	if (ret) {
1949 		dev_warn(pcdev_to_dev(pcdev),
1950 			 "Failed to put subdevice in %s mode: %d\n",
1951 			 on ? "normal operation" : "power saving", ret);
1952 	}
1953 
1954 	return ret;
1955 }
1956 
pxac_fops_camera_open(struct file * filp)1957 static int pxac_fops_camera_open(struct file *filp)
1958 {
1959 	struct pxa_camera_dev *pcdev = video_drvdata(filp);
1960 	int ret;
1961 
1962 	mutex_lock(&pcdev->mlock);
1963 	ret = v4l2_fh_open(filp);
1964 	if (ret < 0)
1965 		goto out;
1966 
1967 	if (!v4l2_fh_is_singular_file(filp))
1968 		goto out;
1969 
1970 	ret = pxac_sensor_set_power(pcdev, 1);
1971 	if (ret)
1972 		v4l2_fh_release(filp);
1973 out:
1974 	mutex_unlock(&pcdev->mlock);
1975 	return ret;
1976 }
1977 
pxac_fops_camera_release(struct file * filp)1978 static int pxac_fops_camera_release(struct file *filp)
1979 {
1980 	struct pxa_camera_dev *pcdev = video_drvdata(filp);
1981 	int ret;
1982 	bool fh_singular;
1983 
1984 	mutex_lock(&pcdev->mlock);
1985 
1986 	fh_singular = v4l2_fh_is_singular_file(filp);
1987 
1988 	ret = _vb2_fop_release(filp, NULL);
1989 
1990 	if (fh_singular)
1991 		ret = pxac_sensor_set_power(pcdev, 0);
1992 
1993 	mutex_unlock(&pcdev->mlock);
1994 
1995 	return ret;
1996 }
1997 
1998 static const struct v4l2_file_operations pxa_camera_fops = {
1999 	.owner		= THIS_MODULE,
2000 	.open		= pxac_fops_camera_open,
2001 	.release	= pxac_fops_camera_release,
2002 	.read		= vb2_fop_read,
2003 	.poll		= vb2_fop_poll,
2004 	.mmap		= vb2_fop_mmap,
2005 	.unlocked_ioctl = video_ioctl2,
2006 };
2007 
2008 static const struct v4l2_ioctl_ops pxa_camera_ioctl_ops = {
2009 	.vidioc_querycap		= pxac_vidioc_querycap,
2010 
2011 	.vidioc_enum_input		= pxac_vidioc_enum_input,
2012 	.vidioc_g_input			= pxac_vidioc_g_input,
2013 	.vidioc_s_input			= pxac_vidioc_s_input,
2014 
2015 	.vidioc_enum_fmt_vid_cap	= pxac_vidioc_enum_fmt_vid_cap,
2016 	.vidioc_g_fmt_vid_cap		= pxac_vidioc_g_fmt_vid_cap,
2017 	.vidioc_s_fmt_vid_cap		= pxac_vidioc_s_fmt_vid_cap,
2018 	.vidioc_try_fmt_vid_cap		= pxac_vidioc_try_fmt_vid_cap,
2019 
2020 	.vidioc_reqbufs			= vb2_ioctl_reqbufs,
2021 	.vidioc_create_bufs		= vb2_ioctl_create_bufs,
2022 	.vidioc_querybuf		= vb2_ioctl_querybuf,
2023 	.vidioc_qbuf			= vb2_ioctl_qbuf,
2024 	.vidioc_dqbuf			= vb2_ioctl_dqbuf,
2025 	.vidioc_expbuf			= vb2_ioctl_expbuf,
2026 	.vidioc_streamon		= vb2_ioctl_streamon,
2027 	.vidioc_streamoff		= vb2_ioctl_streamoff,
2028 #ifdef CONFIG_VIDEO_ADV_DEBUG
2029 	.vidioc_g_register		= pxac_vidioc_g_register,
2030 	.vidioc_s_register		= pxac_vidioc_s_register,
2031 #endif
2032 	.vidioc_subscribe_event		= v4l2_ctrl_subscribe_event,
2033 	.vidioc_unsubscribe_event	= v4l2_event_unsubscribe,
2034 };
2035 
2036 static const struct video_device pxa_camera_videodev_template = {
2037 	.name = "pxa-camera",
2038 	.minor = -1,
2039 	.fops = &pxa_camera_fops,
2040 	.ioctl_ops = &pxa_camera_ioctl_ops,
2041 	.release = video_device_release_empty,
2042 	.device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING,
2043 };
2044 
pxa_camera_sensor_bound(struct v4l2_async_notifier * notifier,struct v4l2_subdev * subdev,struct v4l2_async_connection * asd)2045 static int pxa_camera_sensor_bound(struct v4l2_async_notifier *notifier,
2046 		     struct v4l2_subdev *subdev,
2047 		     struct v4l2_async_connection *asd)
2048 {
2049 	int err;
2050 	struct v4l2_device *v4l2_dev = notifier->v4l2_dev;
2051 	struct pxa_camera_dev *pcdev = v4l2_dev_to_pcdev(v4l2_dev);
2052 	struct video_device *vdev = &pcdev->vdev;
2053 	struct v4l2_pix_format *pix = &pcdev->current_pix;
2054 	struct v4l2_subdev_format format = {
2055 		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
2056 	};
2057 	struct v4l2_mbus_framefmt *mf = &format.format;
2058 
2059 	dev_info(pcdev_to_dev(pcdev), "%s(): trying to bind a device\n",
2060 		 __func__);
2061 	mutex_lock(&pcdev->mlock);
2062 	*vdev = pxa_camera_videodev_template;
2063 	vdev->v4l2_dev = v4l2_dev;
2064 	vdev->lock = &pcdev->mlock;
2065 	pcdev->sensor = subdev;
2066 	pcdev->vdev.queue = &pcdev->vb2_vq;
2067 	pcdev->vdev.v4l2_dev = &pcdev->v4l2_dev;
2068 	pcdev->vdev.ctrl_handler = subdev->ctrl_handler;
2069 	video_set_drvdata(&pcdev->vdev, pcdev);
2070 
2071 	err = pxa_camera_build_formats(pcdev);
2072 	if (err) {
2073 		dev_err(pcdev_to_dev(pcdev), "building formats failed: %d\n",
2074 			err);
2075 		goto out;
2076 	}
2077 
2078 	pcdev->current_fmt = pcdev->user_formats;
2079 	pix->field = V4L2_FIELD_NONE;
2080 	pix->width = DEFAULT_WIDTH;
2081 	pix->height = DEFAULT_HEIGHT;
2082 	pix->bytesperline =
2083 		pxa_mbus_bytes_per_line(pix->width,
2084 					pcdev->current_fmt->host_fmt);
2085 	pix->sizeimage =
2086 		pxa_mbus_image_size(pcdev->current_fmt->host_fmt,
2087 				    pix->bytesperline, pix->height);
2088 	pix->pixelformat = pcdev->current_fmt->host_fmt->fourcc;
2089 	v4l2_fill_mbus_format(mf, pix, pcdev->current_fmt->code);
2090 
2091 	err = pxac_sensor_set_power(pcdev, 1);
2092 	if (err)
2093 		goto out;
2094 
2095 	err = sensor_call(pcdev, pad, set_fmt, NULL, &format);
2096 	if (err)
2097 		goto out_sensor_poweroff;
2098 
2099 	v4l2_fill_pix_format(pix, mf);
2100 	pr_info("%s(): colorspace=0x%x pixfmt=0x%x\n",
2101 		__func__, pix->colorspace, pix->pixelformat);
2102 
2103 	err = pxa_camera_init_videobuf2(pcdev);
2104 	if (err)
2105 		goto out_sensor_poweroff;
2106 
2107 	err = video_register_device(&pcdev->vdev, VFL_TYPE_VIDEO, -1);
2108 	if (err) {
2109 		v4l2_err(v4l2_dev, "register video device failed: %d\n", err);
2110 		pcdev->sensor = NULL;
2111 	} else {
2112 		dev_info(pcdev_to_dev(pcdev),
2113 			 "PXA Camera driver attached to camera %s\n",
2114 			 subdev->name);
2115 	}
2116 
2117 out_sensor_poweroff:
2118 	err = pxac_sensor_set_power(pcdev, 0);
2119 out:
2120 	mutex_unlock(&pcdev->mlock);
2121 	return err;
2122 }
2123 
pxa_camera_sensor_unbind(struct v4l2_async_notifier * notifier,struct v4l2_subdev * subdev,struct v4l2_async_connection * asd)2124 static void pxa_camera_sensor_unbind(struct v4l2_async_notifier *notifier,
2125 		     struct v4l2_subdev *subdev,
2126 		     struct v4l2_async_connection *asd)
2127 {
2128 	struct pxa_camera_dev *pcdev = v4l2_dev_to_pcdev(notifier->v4l2_dev);
2129 
2130 	mutex_lock(&pcdev->mlock);
2131 	dev_info(pcdev_to_dev(pcdev),
2132 		 "PXA Camera driver detached from camera %s\n",
2133 		 subdev->name);
2134 
2135 	/* disable capture, disable interrupts */
2136 	__raw_writel(0x3ff, pcdev->base + CICR0);
2137 
2138 	/* Stop DMA engine */
2139 	pxa_dma_stop_channels(pcdev);
2140 
2141 	pxa_camera_destroy_formats(pcdev);
2142 
2143 	video_unregister_device(&pcdev->vdev);
2144 	pcdev->sensor = NULL;
2145 
2146 	mutex_unlock(&pcdev->mlock);
2147 }
2148 
2149 static const struct v4l2_async_notifier_operations pxa_camera_sensor_ops = {
2150 	.bound = pxa_camera_sensor_bound,
2151 	.unbind = pxa_camera_sensor_unbind,
2152 };
2153 
2154 /*
2155  * Driver probe, remove, suspend and resume operations
2156  */
pxa_camera_suspend(struct device * dev)2157 static int pxa_camera_suspend(struct device *dev)
2158 {
2159 	struct pxa_camera_dev *pcdev = dev_get_drvdata(dev);
2160 	int i = 0, ret = 0;
2161 
2162 	pcdev->save_cicr[i++] = __raw_readl(pcdev->base + CICR0);
2163 	pcdev->save_cicr[i++] = __raw_readl(pcdev->base + CICR1);
2164 	pcdev->save_cicr[i++] = __raw_readl(pcdev->base + CICR2);
2165 	pcdev->save_cicr[i++] = __raw_readl(pcdev->base + CICR3);
2166 	pcdev->save_cicr[i++] = __raw_readl(pcdev->base + CICR4);
2167 
2168 	if (pcdev->sensor)
2169 		ret = pxac_sensor_set_power(pcdev, 0);
2170 
2171 	return ret;
2172 }
2173 
pxa_camera_resume(struct device * dev)2174 static int pxa_camera_resume(struct device *dev)
2175 {
2176 	struct pxa_camera_dev *pcdev = dev_get_drvdata(dev);
2177 	int i = 0, ret = 0;
2178 
2179 	__raw_writel(pcdev->save_cicr[i++] & ~CICR0_ENB, pcdev->base + CICR0);
2180 	__raw_writel(pcdev->save_cicr[i++], pcdev->base + CICR1);
2181 	__raw_writel(pcdev->save_cicr[i++], pcdev->base + CICR2);
2182 	__raw_writel(pcdev->save_cicr[i++], pcdev->base + CICR3);
2183 	__raw_writel(pcdev->save_cicr[i++], pcdev->base + CICR4);
2184 
2185 	if (pcdev->sensor) {
2186 		ret = pxac_sensor_set_power(pcdev, 1);
2187 	}
2188 
2189 	/* Restart frame capture if active buffer exists */
2190 	if (!ret && pcdev->active)
2191 		pxa_camera_start_capture(pcdev);
2192 
2193 	return ret;
2194 }
2195 
pxa_camera_pdata_from_dt(struct device * dev,struct pxa_camera_dev * pcdev)2196 static int pxa_camera_pdata_from_dt(struct device *dev,
2197 				    struct pxa_camera_dev *pcdev)
2198 {
2199 	u32 mclk_rate;
2200 	struct v4l2_async_connection *asd;
2201 	struct device_node *np = dev->of_node;
2202 	struct v4l2_fwnode_endpoint ep = { .bus_type = 0 };
2203 	int err = of_property_read_u32(np, "clock-frequency",
2204 				       &mclk_rate);
2205 	if (!err) {
2206 		pcdev->platform_flags |= PXA_CAMERA_MCLK_EN;
2207 		pcdev->mclk = mclk_rate;
2208 	}
2209 
2210 	np = of_graph_get_next_endpoint(np, NULL);
2211 	if (!np) {
2212 		dev_err(dev, "could not find endpoint\n");
2213 		return -EINVAL;
2214 	}
2215 
2216 	err = v4l2_fwnode_endpoint_parse(of_fwnode_handle(np), &ep);
2217 	if (err) {
2218 		dev_err(dev, "could not parse endpoint\n");
2219 		goto out;
2220 	}
2221 
2222 	switch (ep.bus.parallel.bus_width) {
2223 	case 4:
2224 		pcdev->platform_flags |= PXA_CAMERA_DATAWIDTH_4;
2225 		break;
2226 	case 5:
2227 		pcdev->platform_flags |= PXA_CAMERA_DATAWIDTH_5;
2228 		break;
2229 	case 8:
2230 		pcdev->platform_flags |= PXA_CAMERA_DATAWIDTH_8;
2231 		break;
2232 	case 9:
2233 		pcdev->platform_flags |= PXA_CAMERA_DATAWIDTH_9;
2234 		break;
2235 	case 10:
2236 		pcdev->platform_flags |= PXA_CAMERA_DATAWIDTH_10;
2237 		break;
2238 	default:
2239 		break;
2240 	}
2241 
2242 	if (ep.bus.parallel.flags & V4L2_MBUS_MASTER)
2243 		pcdev->platform_flags |= PXA_CAMERA_MASTER;
2244 	if (ep.bus.parallel.flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH)
2245 		pcdev->platform_flags |= PXA_CAMERA_HSP;
2246 	if (ep.bus.parallel.flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH)
2247 		pcdev->platform_flags |= PXA_CAMERA_VSP;
2248 	if (ep.bus.parallel.flags & V4L2_MBUS_PCLK_SAMPLE_RISING)
2249 		pcdev->platform_flags |= PXA_CAMERA_PCLK_EN | PXA_CAMERA_PCP;
2250 	if (ep.bus.parallel.flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)
2251 		pcdev->platform_flags |= PXA_CAMERA_PCLK_EN;
2252 
2253 	asd = v4l2_async_nf_add_fwnode_remote(&pcdev->notifier,
2254 					      of_fwnode_handle(np),
2255 					      struct v4l2_async_connection);
2256 	if (IS_ERR(asd))
2257 		err = PTR_ERR(asd);
2258 out:
2259 	of_node_put(np);
2260 
2261 	return err;
2262 }
2263 
pxa_camera_probe(struct platform_device * pdev)2264 static int pxa_camera_probe(struct platform_device *pdev)
2265 {
2266 	struct pxa_camera_dev *pcdev;
2267 	struct resource *res;
2268 	void __iomem *base;
2269 	struct dma_slave_config config = {
2270 		.src_addr_width = 0,
2271 		.src_maxburst = 8,
2272 		.direction = DMA_DEV_TO_MEM,
2273 	};
2274 	int irq;
2275 	int err = 0, i;
2276 
2277 	irq = platform_get_irq(pdev, 0);
2278 	if (irq < 0)
2279 		return -ENODEV;
2280 
2281 	pcdev = devm_kzalloc(&pdev->dev, sizeof(*pcdev), GFP_KERNEL);
2282 	if (!pcdev) {
2283 		dev_err(&pdev->dev, "Could not allocate pcdev\n");
2284 		return -ENOMEM;
2285 	}
2286 
2287 	pcdev->clk = devm_clk_get(&pdev->dev, NULL);
2288 	if (IS_ERR(pcdev->clk))
2289 		return PTR_ERR(pcdev->clk);
2290 
2291 	/*
2292 	 * Request the regions.
2293 	 */
2294 	base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
2295 	if (IS_ERR(base))
2296 		return PTR_ERR(base);
2297 
2298 	pcdev->irq = irq;
2299 	pcdev->base = base;
2300 
2301 	err = v4l2_device_register(&pdev->dev, &pcdev->v4l2_dev);
2302 	if (err)
2303 		return err;
2304 
2305 	v4l2_async_nf_init(&pcdev->notifier, &pcdev->v4l2_dev);
2306 	pcdev->res = res;
2307 	pcdev->pdata = pdev->dev.platform_data;
2308 	if (pcdev->pdata) {
2309 		struct v4l2_async_connection *asd;
2310 
2311 		pcdev->platform_flags = pcdev->pdata->flags;
2312 		pcdev->mclk = pcdev->pdata->mclk_10khz * 10000;
2313 		asd = v4l2_async_nf_add_i2c(&pcdev->notifier,
2314 					    pcdev->pdata->sensor_i2c_adapter_id,
2315 					    pcdev->pdata->sensor_i2c_address,
2316 					    struct v4l2_async_connection);
2317 		if (IS_ERR(asd))
2318 			err = PTR_ERR(asd);
2319 	} else if (pdev->dev.of_node) {
2320 		err = pxa_camera_pdata_from_dt(&pdev->dev, pcdev);
2321 	} else {
2322 		err = -ENODEV;
2323 	}
2324 	if (err < 0)
2325 		goto exit_v4l2_device_unregister;
2326 
2327 	if (!(pcdev->platform_flags & (PXA_CAMERA_DATAWIDTH_8 |
2328 			PXA_CAMERA_DATAWIDTH_9 | PXA_CAMERA_DATAWIDTH_10))) {
2329 		/*
2330 		 * Platform hasn't set available data widths. This is bad.
2331 		 * Warn and use a default.
2332 		 */
2333 		dev_warn(&pdev->dev, "WARNING! Platform hasn't set available data widths, using default 10 bit\n");
2334 		pcdev->platform_flags |= PXA_CAMERA_DATAWIDTH_10;
2335 	}
2336 	if (pcdev->platform_flags & PXA_CAMERA_DATAWIDTH_8)
2337 		pcdev->width_flags = 1 << 7;
2338 	if (pcdev->platform_flags & PXA_CAMERA_DATAWIDTH_9)
2339 		pcdev->width_flags |= 1 << 8;
2340 	if (pcdev->platform_flags & PXA_CAMERA_DATAWIDTH_10)
2341 		pcdev->width_flags |= 1 << 9;
2342 	if (!pcdev->mclk) {
2343 		dev_warn(&pdev->dev,
2344 			 "mclk == 0! Please, fix your platform data. Using default 20MHz\n");
2345 		pcdev->mclk = 20000000;
2346 	}
2347 
2348 	pcdev->mclk_divisor = mclk_get_divisor(pdev, pcdev);
2349 
2350 	INIT_LIST_HEAD(&pcdev->capture);
2351 	spin_lock_init(&pcdev->lock);
2352 	mutex_init(&pcdev->mlock);
2353 
2354 	/* request dma */
2355 	pcdev->dma_chans[0] = dma_request_chan(&pdev->dev, "CI_Y");
2356 	if (IS_ERR(pcdev->dma_chans[0])) {
2357 		dev_err(&pdev->dev, "Can't request DMA for Y\n");
2358 		err = PTR_ERR(pcdev->dma_chans[0]);
2359 		goto exit_notifier_cleanup;
2360 	}
2361 
2362 	pcdev->dma_chans[1] = dma_request_chan(&pdev->dev, "CI_U");
2363 	if (IS_ERR(pcdev->dma_chans[1])) {
2364 		dev_err(&pdev->dev, "Can't request DMA for U\n");
2365 		err = PTR_ERR(pcdev->dma_chans[1]);
2366 		goto exit_free_dma_y;
2367 	}
2368 
2369 	pcdev->dma_chans[2] = dma_request_chan(&pdev->dev, "CI_V");
2370 	if (IS_ERR(pcdev->dma_chans[2])) {
2371 		dev_err(&pdev->dev, "Can't request DMA for V\n");
2372 		err = PTR_ERR(pcdev->dma_chans[2]);
2373 		goto exit_free_dma_u;
2374 	}
2375 
2376 	for (i = 0; i < 3; i++) {
2377 		config.src_addr = pcdev->res->start + CIBR0 + i * 8;
2378 		err = dmaengine_slave_config(pcdev->dma_chans[i], &config);
2379 		if (err < 0) {
2380 			dev_err(&pdev->dev, "dma slave config failed: %d\n",
2381 				err);
2382 			goto exit_free_dma;
2383 		}
2384 	}
2385 
2386 	tasklet_setup(&pcdev->task_eof, pxa_camera_eof);
2387 
2388 	pxa_camera_activate(pcdev);
2389 
2390 	platform_set_drvdata(pdev, pcdev);
2391 
2392 	err = pxa_camera_init_videobuf2(pcdev);
2393 	if (err)
2394 		goto exit_deactivate;
2395 
2396 	/* request irq */
2397 	err = devm_request_irq(&pdev->dev, pcdev->irq, pxa_camera_irq, 0,
2398 			       PXA_CAM_DRV_NAME, pcdev);
2399 	if (err) {
2400 		dev_err(&pdev->dev, "Camera interrupt register failed\n");
2401 		goto exit_deactivate;
2402 	}
2403 
2404 	pcdev->notifier.ops = &pxa_camera_sensor_ops;
2405 	err = v4l2_async_nf_register(&pcdev->notifier);
2406 	if (err)
2407 		goto exit_deactivate;
2408 
2409 	return 0;
2410 exit_deactivate:
2411 	pxa_camera_deactivate(pcdev);
2412 	tasklet_kill(&pcdev->task_eof);
2413 exit_free_dma:
2414 	dma_release_channel(pcdev->dma_chans[2]);
2415 exit_free_dma_u:
2416 	dma_release_channel(pcdev->dma_chans[1]);
2417 exit_free_dma_y:
2418 	dma_release_channel(pcdev->dma_chans[0]);
2419 exit_notifier_cleanup:
2420 	v4l2_async_nf_cleanup(&pcdev->notifier);
2421 exit_v4l2_device_unregister:
2422 	v4l2_device_unregister(&pcdev->v4l2_dev);
2423 	return err;
2424 }
2425 
pxa_camera_remove(struct platform_device * pdev)2426 static void pxa_camera_remove(struct platform_device *pdev)
2427 {
2428 	struct pxa_camera_dev *pcdev = platform_get_drvdata(pdev);
2429 
2430 	pxa_camera_deactivate(pcdev);
2431 	tasklet_kill(&pcdev->task_eof);
2432 	dma_release_channel(pcdev->dma_chans[0]);
2433 	dma_release_channel(pcdev->dma_chans[1]);
2434 	dma_release_channel(pcdev->dma_chans[2]);
2435 
2436 	v4l2_async_nf_unregister(&pcdev->notifier);
2437 	v4l2_async_nf_cleanup(&pcdev->notifier);
2438 
2439 	v4l2_device_unregister(&pcdev->v4l2_dev);
2440 
2441 	dev_info(&pdev->dev, "PXA Camera driver unloaded\n");
2442 }
2443 
2444 static const struct dev_pm_ops pxa_camera_pm = {
2445 	.suspend	= pxa_camera_suspend,
2446 	.resume		= pxa_camera_resume,
2447 };
2448 
2449 static const struct of_device_id pxa_camera_of_match[] = {
2450 	{ .compatible = "marvell,pxa270-qci", },
2451 	{},
2452 };
2453 MODULE_DEVICE_TABLE(of, pxa_camera_of_match);
2454 
2455 static struct platform_driver pxa_camera_driver = {
2456 	.driver		= {
2457 		.name	= PXA_CAM_DRV_NAME,
2458 		.pm	= &pxa_camera_pm,
2459 		.of_match_table = pxa_camera_of_match,
2460 	},
2461 	.probe		= pxa_camera_probe,
2462 	.remove_new	= pxa_camera_remove,
2463 };
2464 
2465 module_platform_driver(pxa_camera_driver);
2466 
2467 MODULE_DESCRIPTION("PXA27x Camera Driver");
2468 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
2469 MODULE_LICENSE("GPL");
2470 MODULE_VERSION(PXA_CAM_VERSION);
2471 MODULE_ALIAS("platform:" PXA_CAM_DRV_NAME);
2472