1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * ispcsi2.c
4  *
5  * TI OMAP3 ISP - CSI2 module
6  *
7  * Copyright (C) 2010 Nokia Corporation
8  * Copyright (C) 2009 Texas Instruments, Inc.
9  *
10  * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
11  *	     Sakari Ailus <sakari.ailus@iki.fi>
12  */
13 #include <linux/delay.h>
14 #include <media/v4l2-common.h>
15 #include <linux/v4l2-mediabus.h>
16 #include <linux/mm.h>
17 
18 #include "isp.h"
19 #include "ispreg.h"
20 #include "ispcsi2.h"
21 
22 /*
23  * csi2_if_enable - Enable CSI2 Receiver interface.
24  * @enable: enable flag
25  *
26  */
27 static void csi2_if_enable(struct isp_device *isp,
28 			   struct isp_csi2_device *csi2, u8 enable)
29 {
30 	struct isp_csi2_ctrl_cfg *currctrl = &csi2->ctrl;
31 
32 	isp_reg_clr_set(isp, csi2->regs1, ISPCSI2_CTRL, ISPCSI2_CTRL_IF_EN,
33 			enable ? ISPCSI2_CTRL_IF_EN : 0);
34 
35 	currctrl->if_enable = enable;
36 }
37 
38 /*
39  * csi2_recv_config - CSI2 receiver module configuration.
40  * @currctrl: isp_csi2_ctrl_cfg structure
41  *
42  */
43 static void csi2_recv_config(struct isp_device *isp,
44 			     struct isp_csi2_device *csi2,
45 			     struct isp_csi2_ctrl_cfg *currctrl)
46 {
47 	u32 reg;
48 
49 	reg = isp_reg_readl(isp, csi2->regs1, ISPCSI2_CTRL);
50 
51 	if (currctrl->frame_mode)
52 		reg |= ISPCSI2_CTRL_FRAME;
53 	else
54 		reg &= ~ISPCSI2_CTRL_FRAME;
55 
56 	if (currctrl->vp_clk_enable)
57 		reg |= ISPCSI2_CTRL_VP_CLK_EN;
58 	else
59 		reg &= ~ISPCSI2_CTRL_VP_CLK_EN;
60 
61 	if (currctrl->vp_only_enable)
62 		reg |= ISPCSI2_CTRL_VP_ONLY_EN;
63 	else
64 		reg &= ~ISPCSI2_CTRL_VP_ONLY_EN;
65 
66 	reg &= ~ISPCSI2_CTRL_VP_OUT_CTRL_MASK;
67 	reg |= currctrl->vp_out_ctrl << ISPCSI2_CTRL_VP_OUT_CTRL_SHIFT;
68 
69 	if (currctrl->ecc_enable)
70 		reg |= ISPCSI2_CTRL_ECC_EN;
71 	else
72 		reg &= ~ISPCSI2_CTRL_ECC_EN;
73 
74 	isp_reg_writel(isp, reg, csi2->regs1, ISPCSI2_CTRL);
75 }
76 
77 static const unsigned int csi2_input_fmts[] = {
78 	MEDIA_BUS_FMT_SGRBG10_1X10,
79 	MEDIA_BUS_FMT_SGRBG10_DPCM8_1X8,
80 	MEDIA_BUS_FMT_SRGGB10_1X10,
81 	MEDIA_BUS_FMT_SRGGB10_DPCM8_1X8,
82 	MEDIA_BUS_FMT_SBGGR10_1X10,
83 	MEDIA_BUS_FMT_SBGGR10_DPCM8_1X8,
84 	MEDIA_BUS_FMT_SGBRG10_1X10,
85 	MEDIA_BUS_FMT_SGBRG10_DPCM8_1X8,
86 	MEDIA_BUS_FMT_YUYV8_2X8,
87 };
88 
89 /* To set the format on the CSI2 requires a mapping function that takes
90  * the following inputs:
91  * - 3 different formats (at this time)
92  * - 2 destinations (mem, vp+mem) (vp only handled separately)
93  * - 2 decompression options (on, off)
94  * - 2 isp revisions (certain format must be handled differently on OMAP3630)
95  * Output should be CSI2 frame format code
96  * Array indices as follows: [format][dest][decompr][is_3630]
97  * Not all combinations are valid. 0 means invalid.
98  */
99 static const u16 __csi2_fmt_map[3][2][2][2] = {
100 	/* RAW10 formats */
101 	{
102 		/* Output to memory */
103 		{
104 			/* No DPCM decompression */
105 			{ CSI2_PIX_FMT_RAW10_EXP16, CSI2_PIX_FMT_RAW10_EXP16 },
106 			/* DPCM decompression */
107 			{ 0, 0 },
108 		},
109 		/* Output to both */
110 		{
111 			/* No DPCM decompression */
112 			{ CSI2_PIX_FMT_RAW10_EXP16_VP,
113 			  CSI2_PIX_FMT_RAW10_EXP16_VP },
114 			/* DPCM decompression */
115 			{ 0, 0 },
116 		},
117 	},
118 	/* RAW10 DPCM8 formats */
119 	{
120 		/* Output to memory */
121 		{
122 			/* No DPCM decompression */
123 			{ CSI2_PIX_FMT_RAW8, CSI2_USERDEF_8BIT_DATA1 },
124 			/* DPCM decompression */
125 			{ CSI2_PIX_FMT_RAW8_DPCM10_EXP16,
126 			  CSI2_USERDEF_8BIT_DATA1_DPCM10 },
127 		},
128 		/* Output to both */
129 		{
130 			/* No DPCM decompression */
131 			{ CSI2_PIX_FMT_RAW8_VP,
132 			  CSI2_PIX_FMT_RAW8_VP },
133 			/* DPCM decompression */
134 			{ CSI2_PIX_FMT_RAW8_DPCM10_VP,
135 			  CSI2_USERDEF_8BIT_DATA1_DPCM10_VP },
136 		},
137 	},
138 	/* YUYV8 2X8 formats */
139 	{
140 		/* Output to memory */
141 		{
142 			/* No DPCM decompression */
143 			{ CSI2_PIX_FMT_YUV422_8BIT,
144 			  CSI2_PIX_FMT_YUV422_8BIT },
145 			/* DPCM decompression */
146 			{ 0, 0 },
147 		},
148 		/* Output to both */
149 		{
150 			/* No DPCM decompression */
151 			{ CSI2_PIX_FMT_YUV422_8BIT_VP,
152 			  CSI2_PIX_FMT_YUV422_8BIT_VP },
153 			/* DPCM decompression */
154 			{ 0, 0 },
155 		},
156 	},
157 };
158 
159 /*
160  * csi2_ctx_map_format - Map CSI2 sink media bus format to CSI2 format ID
161  * @csi2: ISP CSI2 device
162  *
163  * Returns CSI2 physical format id
164  */
165 static u16 csi2_ctx_map_format(struct isp_csi2_device *csi2)
166 {
167 	const struct v4l2_mbus_framefmt *fmt = &csi2->formats[CSI2_PAD_SINK];
168 	int fmtidx, destidx, is_3630;
169 
170 	switch (fmt->code) {
171 	case MEDIA_BUS_FMT_SGRBG10_1X10:
172 	case MEDIA_BUS_FMT_SRGGB10_1X10:
173 	case MEDIA_BUS_FMT_SBGGR10_1X10:
174 	case MEDIA_BUS_FMT_SGBRG10_1X10:
175 		fmtidx = 0;
176 		break;
177 	case MEDIA_BUS_FMT_SGRBG10_DPCM8_1X8:
178 	case MEDIA_BUS_FMT_SRGGB10_DPCM8_1X8:
179 	case MEDIA_BUS_FMT_SBGGR10_DPCM8_1X8:
180 	case MEDIA_BUS_FMT_SGBRG10_DPCM8_1X8:
181 		fmtidx = 1;
182 		break;
183 	case MEDIA_BUS_FMT_YUYV8_2X8:
184 		fmtidx = 2;
185 		break;
186 	default:
187 		WARN(1, KERN_ERR "CSI2: pixel format %08x unsupported!\n",
188 		     fmt->code);
189 		return 0;
190 	}
191 
192 	if (!(csi2->output & CSI2_OUTPUT_CCDC) &&
193 	    !(csi2->output & CSI2_OUTPUT_MEMORY)) {
194 		/* Neither output enabled is a valid combination */
195 		return CSI2_PIX_FMT_OTHERS;
196 	}
197 
198 	/* If we need to skip frames at the beginning of the stream disable the
199 	 * video port to avoid sending the skipped frames to the CCDC.
200 	 */
201 	destidx = csi2->frame_skip ? 0 : !!(csi2->output & CSI2_OUTPUT_CCDC);
202 	is_3630 = csi2->isp->revision == ISP_REVISION_15_0;
203 
204 	return __csi2_fmt_map[fmtidx][destidx][csi2->dpcm_decompress][is_3630];
205 }
206 
207 /*
208  * csi2_set_outaddr - Set memory address to save output image
209  * @csi2: Pointer to ISP CSI2a device.
210  * @addr: ISP MMU Mapped 32-bit memory address aligned on 32 byte boundary.
211  *
212  * Sets the memory address where the output will be saved.
213  *
214  * Returns 0 if successful, or -EINVAL if the address is not in the 32 byte
215  * boundary.
216  */
217 static void csi2_set_outaddr(struct isp_csi2_device *csi2, u32 addr)
218 {
219 	struct isp_device *isp = csi2->isp;
220 	struct isp_csi2_ctx_cfg *ctx = &csi2->contexts[0];
221 
222 	ctx->ping_addr = addr;
223 	ctx->pong_addr = addr;
224 	isp_reg_writel(isp, ctx->ping_addr,
225 		       csi2->regs1, ISPCSI2_CTX_DAT_PING_ADDR(ctx->ctxnum));
226 	isp_reg_writel(isp, ctx->pong_addr,
227 		       csi2->regs1, ISPCSI2_CTX_DAT_PONG_ADDR(ctx->ctxnum));
228 }
229 
230 /*
231  * is_usr_def_mapping - Checks whether USER_DEF_MAPPING should
232  *			be enabled by CSI2.
233  * @format_id: mapped format id
234  *
235  */
236 static inline int is_usr_def_mapping(u32 format_id)
237 {
238 	return (format_id & 0x40) ? 1 : 0;
239 }
240 
241 /*
242  * csi2_ctx_enable - Enable specified CSI2 context
243  * @ctxnum: Context number, valid between 0 and 7 values.
244  * @enable: enable
245  *
246  */
247 static void csi2_ctx_enable(struct isp_device *isp,
248 			    struct isp_csi2_device *csi2, u8 ctxnum, u8 enable)
249 {
250 	struct isp_csi2_ctx_cfg *ctx = &csi2->contexts[ctxnum];
251 	unsigned int skip = 0;
252 	u32 reg;
253 
254 	reg = isp_reg_readl(isp, csi2->regs1, ISPCSI2_CTX_CTRL1(ctxnum));
255 
256 	if (enable) {
257 		if (csi2->frame_skip)
258 			skip = csi2->frame_skip;
259 		else if (csi2->output & CSI2_OUTPUT_MEMORY)
260 			skip = 1;
261 
262 		reg &= ~ISPCSI2_CTX_CTRL1_COUNT_MASK;
263 		reg |= ISPCSI2_CTX_CTRL1_COUNT_UNLOCK
264 		    |  (skip << ISPCSI2_CTX_CTRL1_COUNT_SHIFT)
265 		    |  ISPCSI2_CTX_CTRL1_CTX_EN;
266 	} else {
267 		reg &= ~ISPCSI2_CTX_CTRL1_CTX_EN;
268 	}
269 
270 	isp_reg_writel(isp, reg, csi2->regs1, ISPCSI2_CTX_CTRL1(ctxnum));
271 	ctx->enabled = enable;
272 }
273 
274 /*
275  * csi2_ctx_config - CSI2 context configuration.
276  * @ctx: context configuration
277  *
278  */
279 static void csi2_ctx_config(struct isp_device *isp,
280 			    struct isp_csi2_device *csi2,
281 			    struct isp_csi2_ctx_cfg *ctx)
282 {
283 	u32 reg;
284 
285 	/* Set up CSI2_CTx_CTRL1 */
286 	reg = isp_reg_readl(isp, csi2->regs1, ISPCSI2_CTX_CTRL1(ctx->ctxnum));
287 
288 	if (ctx->eof_enabled)
289 		reg |= ISPCSI2_CTX_CTRL1_EOF_EN;
290 	else
291 		reg &= ~ISPCSI2_CTX_CTRL1_EOF_EN;
292 
293 	if (ctx->eol_enabled)
294 		reg |= ISPCSI2_CTX_CTRL1_EOL_EN;
295 	else
296 		reg &= ~ISPCSI2_CTX_CTRL1_EOL_EN;
297 
298 	if (ctx->checksum_enabled)
299 		reg |= ISPCSI2_CTX_CTRL1_CS_EN;
300 	else
301 		reg &= ~ISPCSI2_CTX_CTRL1_CS_EN;
302 
303 	isp_reg_writel(isp, reg, csi2->regs1, ISPCSI2_CTX_CTRL1(ctx->ctxnum));
304 
305 	/* Set up CSI2_CTx_CTRL2 */
306 	reg = isp_reg_readl(isp, csi2->regs1, ISPCSI2_CTX_CTRL2(ctx->ctxnum));
307 
308 	reg &= ~(ISPCSI2_CTX_CTRL2_VIRTUAL_ID_MASK);
309 	reg |= ctx->virtual_id << ISPCSI2_CTX_CTRL2_VIRTUAL_ID_SHIFT;
310 
311 	reg &= ~(ISPCSI2_CTX_CTRL2_FORMAT_MASK);
312 	reg |= ctx->format_id << ISPCSI2_CTX_CTRL2_FORMAT_SHIFT;
313 
314 	if (ctx->dpcm_decompress) {
315 		if (ctx->dpcm_predictor)
316 			reg |= ISPCSI2_CTX_CTRL2_DPCM_PRED;
317 		else
318 			reg &= ~ISPCSI2_CTX_CTRL2_DPCM_PRED;
319 	}
320 
321 	if (is_usr_def_mapping(ctx->format_id)) {
322 		reg &= ~ISPCSI2_CTX_CTRL2_USER_DEF_MAP_MASK;
323 		reg |= 2 << ISPCSI2_CTX_CTRL2_USER_DEF_MAP_SHIFT;
324 	}
325 
326 	isp_reg_writel(isp, reg, csi2->regs1, ISPCSI2_CTX_CTRL2(ctx->ctxnum));
327 
328 	/* Set up CSI2_CTx_CTRL3 */
329 	reg = isp_reg_readl(isp, csi2->regs1, ISPCSI2_CTX_CTRL3(ctx->ctxnum));
330 	reg &= ~(ISPCSI2_CTX_CTRL3_ALPHA_MASK);
331 	reg |= (ctx->alpha << ISPCSI2_CTX_CTRL3_ALPHA_SHIFT);
332 
333 	isp_reg_writel(isp, reg, csi2->regs1, ISPCSI2_CTX_CTRL3(ctx->ctxnum));
334 
335 	/* Set up CSI2_CTx_DAT_OFST */
336 	reg = isp_reg_readl(isp, csi2->regs1,
337 			    ISPCSI2_CTX_DAT_OFST(ctx->ctxnum));
338 	reg &= ~ISPCSI2_CTX_DAT_OFST_OFST_MASK;
339 	reg |= ctx->data_offset << ISPCSI2_CTX_DAT_OFST_OFST_SHIFT;
340 	isp_reg_writel(isp, reg, csi2->regs1,
341 		       ISPCSI2_CTX_DAT_OFST(ctx->ctxnum));
342 
343 	isp_reg_writel(isp, ctx->ping_addr,
344 		       csi2->regs1, ISPCSI2_CTX_DAT_PING_ADDR(ctx->ctxnum));
345 
346 	isp_reg_writel(isp, ctx->pong_addr,
347 		       csi2->regs1, ISPCSI2_CTX_DAT_PONG_ADDR(ctx->ctxnum));
348 }
349 
350 /*
351  * csi2_timing_config - CSI2 timing configuration.
352  * @timing: csi2_timing_cfg structure
353  */
354 static void csi2_timing_config(struct isp_device *isp,
355 			       struct isp_csi2_device *csi2,
356 			       struct isp_csi2_timing_cfg *timing)
357 {
358 	u32 reg;
359 
360 	reg = isp_reg_readl(isp, csi2->regs1, ISPCSI2_TIMING);
361 
362 	if (timing->force_rx_mode)
363 		reg |= ISPCSI2_TIMING_FORCE_RX_MODE_IO(timing->ionum);
364 	else
365 		reg &= ~ISPCSI2_TIMING_FORCE_RX_MODE_IO(timing->ionum);
366 
367 	if (timing->stop_state_16x)
368 		reg |= ISPCSI2_TIMING_STOP_STATE_X16_IO(timing->ionum);
369 	else
370 		reg &= ~ISPCSI2_TIMING_STOP_STATE_X16_IO(timing->ionum);
371 
372 	if (timing->stop_state_4x)
373 		reg |= ISPCSI2_TIMING_STOP_STATE_X4_IO(timing->ionum);
374 	else
375 		reg &= ~ISPCSI2_TIMING_STOP_STATE_X4_IO(timing->ionum);
376 
377 	reg &= ~ISPCSI2_TIMING_STOP_STATE_COUNTER_IO_MASK(timing->ionum);
378 	reg |= timing->stop_state_counter <<
379 	       ISPCSI2_TIMING_STOP_STATE_COUNTER_IO_SHIFT(timing->ionum);
380 
381 	isp_reg_writel(isp, reg, csi2->regs1, ISPCSI2_TIMING);
382 }
383 
384 /*
385  * csi2_irq_ctx_set - Enables CSI2 Context IRQs.
386  * @enable: Enable/disable CSI2 Context interrupts
387  */
388 static void csi2_irq_ctx_set(struct isp_device *isp,
389 			     struct isp_csi2_device *csi2, int enable)
390 {
391 	int i;
392 
393 	for (i = 0; i < 8; i++) {
394 		isp_reg_writel(isp, ISPCSI2_CTX_IRQSTATUS_FE_IRQ, csi2->regs1,
395 			       ISPCSI2_CTX_IRQSTATUS(i));
396 		if (enable)
397 			isp_reg_set(isp, csi2->regs1, ISPCSI2_CTX_IRQENABLE(i),
398 				    ISPCSI2_CTX_IRQSTATUS_FE_IRQ);
399 		else
400 			isp_reg_clr(isp, csi2->regs1, ISPCSI2_CTX_IRQENABLE(i),
401 				    ISPCSI2_CTX_IRQSTATUS_FE_IRQ);
402 	}
403 }
404 
405 /*
406  * csi2_irq_complexio1_set - Enables CSI2 ComplexIO IRQs.
407  * @enable: Enable/disable CSI2 ComplexIO #1 interrupts
408  */
409 static void csi2_irq_complexio1_set(struct isp_device *isp,
410 				    struct isp_csi2_device *csi2, int enable)
411 {
412 	u32 reg;
413 	reg = ISPCSI2_PHY_IRQENABLE_STATEALLULPMEXIT |
414 		ISPCSI2_PHY_IRQENABLE_STATEALLULPMENTER |
415 		ISPCSI2_PHY_IRQENABLE_STATEULPM5 |
416 		ISPCSI2_PHY_IRQENABLE_ERRCONTROL5 |
417 		ISPCSI2_PHY_IRQENABLE_ERRESC5 |
418 		ISPCSI2_PHY_IRQENABLE_ERRSOTSYNCHS5 |
419 		ISPCSI2_PHY_IRQENABLE_ERRSOTHS5 |
420 		ISPCSI2_PHY_IRQENABLE_STATEULPM4 |
421 		ISPCSI2_PHY_IRQENABLE_ERRCONTROL4 |
422 		ISPCSI2_PHY_IRQENABLE_ERRESC4 |
423 		ISPCSI2_PHY_IRQENABLE_ERRSOTSYNCHS4 |
424 		ISPCSI2_PHY_IRQENABLE_ERRSOTHS4 |
425 		ISPCSI2_PHY_IRQENABLE_STATEULPM3 |
426 		ISPCSI2_PHY_IRQENABLE_ERRCONTROL3 |
427 		ISPCSI2_PHY_IRQENABLE_ERRESC3 |
428 		ISPCSI2_PHY_IRQENABLE_ERRSOTSYNCHS3 |
429 		ISPCSI2_PHY_IRQENABLE_ERRSOTHS3 |
430 		ISPCSI2_PHY_IRQENABLE_STATEULPM2 |
431 		ISPCSI2_PHY_IRQENABLE_ERRCONTROL2 |
432 		ISPCSI2_PHY_IRQENABLE_ERRESC2 |
433 		ISPCSI2_PHY_IRQENABLE_ERRSOTSYNCHS2 |
434 		ISPCSI2_PHY_IRQENABLE_ERRSOTHS2 |
435 		ISPCSI2_PHY_IRQENABLE_STATEULPM1 |
436 		ISPCSI2_PHY_IRQENABLE_ERRCONTROL1 |
437 		ISPCSI2_PHY_IRQENABLE_ERRESC1 |
438 		ISPCSI2_PHY_IRQENABLE_ERRSOTSYNCHS1 |
439 		ISPCSI2_PHY_IRQENABLE_ERRSOTHS1;
440 	isp_reg_writel(isp, reg, csi2->regs1, ISPCSI2_PHY_IRQSTATUS);
441 	if (enable)
442 		reg |= isp_reg_readl(isp, csi2->regs1, ISPCSI2_PHY_IRQENABLE);
443 	else
444 		reg = 0;
445 	isp_reg_writel(isp, reg, csi2->regs1, ISPCSI2_PHY_IRQENABLE);
446 }
447 
448 /*
449  * csi2_irq_status_set - Enables CSI2 Status IRQs.
450  * @enable: Enable/disable CSI2 Status interrupts
451  */
452 static void csi2_irq_status_set(struct isp_device *isp,
453 				struct isp_csi2_device *csi2, int enable)
454 {
455 	u32 reg;
456 	reg = ISPCSI2_IRQSTATUS_OCP_ERR_IRQ |
457 		ISPCSI2_IRQSTATUS_SHORT_PACKET_IRQ |
458 		ISPCSI2_IRQSTATUS_ECC_CORRECTION_IRQ |
459 		ISPCSI2_IRQSTATUS_ECC_NO_CORRECTION_IRQ |
460 		ISPCSI2_IRQSTATUS_COMPLEXIO2_ERR_IRQ |
461 		ISPCSI2_IRQSTATUS_COMPLEXIO1_ERR_IRQ |
462 		ISPCSI2_IRQSTATUS_FIFO_OVF_IRQ |
463 		ISPCSI2_IRQSTATUS_CONTEXT(0);
464 	isp_reg_writel(isp, reg, csi2->regs1, ISPCSI2_IRQSTATUS);
465 	if (enable)
466 		reg |= isp_reg_readl(isp, csi2->regs1, ISPCSI2_IRQENABLE);
467 	else
468 		reg = 0;
469 
470 	isp_reg_writel(isp, reg, csi2->regs1, ISPCSI2_IRQENABLE);
471 }
472 
473 /*
474  * omap3isp_csi2_reset - Resets the CSI2 module.
475  *
476  * Must be called with the phy lock held.
477  *
478  * Returns 0 if successful, or -EBUSY if power command didn't respond.
479  */
480 int omap3isp_csi2_reset(struct isp_csi2_device *csi2)
481 {
482 	struct isp_device *isp = csi2->isp;
483 	u8 soft_reset_retries = 0;
484 	u32 reg;
485 	int i;
486 
487 	if (!csi2->available)
488 		return -ENODEV;
489 
490 	if (csi2->phy->entity)
491 		return -EBUSY;
492 
493 	isp_reg_set(isp, csi2->regs1, ISPCSI2_SYSCONFIG,
494 		    ISPCSI2_SYSCONFIG_SOFT_RESET);
495 
496 	do {
497 		reg = isp_reg_readl(isp, csi2->regs1, ISPCSI2_SYSSTATUS) &
498 				    ISPCSI2_SYSSTATUS_RESET_DONE;
499 		if (reg == ISPCSI2_SYSSTATUS_RESET_DONE)
500 			break;
501 		soft_reset_retries++;
502 		if (soft_reset_retries < 5)
503 			udelay(100);
504 	} while (soft_reset_retries < 5);
505 
506 	if (soft_reset_retries == 5) {
507 		dev_err(isp->dev, "CSI2: Soft reset try count exceeded!\n");
508 		return -EBUSY;
509 	}
510 
511 	if (isp->revision == ISP_REVISION_15_0)
512 		isp_reg_set(isp, csi2->regs1, ISPCSI2_PHY_CFG,
513 			    ISPCSI2_PHY_CFG_RESET_CTRL);
514 
515 	i = 100;
516 	do {
517 		reg = isp_reg_readl(isp, csi2->phy->phy_regs, ISPCSIPHY_REG1)
518 		    & ISPCSIPHY_REG1_RESET_DONE_CTRLCLK;
519 		if (reg == ISPCSIPHY_REG1_RESET_DONE_CTRLCLK)
520 			break;
521 		udelay(100);
522 	} while (--i > 0);
523 
524 	if (i == 0) {
525 		dev_err(isp->dev,
526 			"CSI2: Reset for CSI2_96M_FCLK domain Failed!\n");
527 		return -EBUSY;
528 	}
529 
530 	if (isp->autoidle)
531 		isp_reg_clr_set(isp, csi2->regs1, ISPCSI2_SYSCONFIG,
532 				ISPCSI2_SYSCONFIG_MSTANDBY_MODE_MASK |
533 				ISPCSI2_SYSCONFIG_AUTO_IDLE,
534 				ISPCSI2_SYSCONFIG_MSTANDBY_MODE_SMART |
535 				((isp->revision == ISP_REVISION_15_0) ?
536 				 ISPCSI2_SYSCONFIG_AUTO_IDLE : 0));
537 	else
538 		isp_reg_clr_set(isp, csi2->regs1, ISPCSI2_SYSCONFIG,
539 				ISPCSI2_SYSCONFIG_MSTANDBY_MODE_MASK |
540 				ISPCSI2_SYSCONFIG_AUTO_IDLE,
541 				ISPCSI2_SYSCONFIG_MSTANDBY_MODE_NO);
542 
543 	return 0;
544 }
545 
546 static int csi2_configure(struct isp_csi2_device *csi2)
547 {
548 	struct isp_pipeline *pipe = to_isp_pipeline(&csi2->subdev.entity);
549 	const struct isp_bus_cfg *buscfg;
550 	struct isp_device *isp = csi2->isp;
551 	struct isp_csi2_timing_cfg *timing = &csi2->timing[0];
552 	struct v4l2_subdev *sensor;
553 	struct media_pad *pad;
554 
555 	/*
556 	 * CSI2 fields that can be updated while the context has
557 	 * been enabled or the interface has been enabled are not
558 	 * updated dynamically currently. So we do not allow to
559 	 * reconfigure if either has been enabled
560 	 */
561 	if (csi2->contexts[0].enabled || csi2->ctrl.if_enable)
562 		return -EBUSY;
563 
564 	pad = media_pad_remote_pad_first(&csi2->pads[CSI2_PAD_SINK]);
565 	sensor = media_entity_to_v4l2_subdev(pad->entity);
566 	buscfg = v4l2_subdev_to_bus_cfg(pipe->external);
567 	if (WARN_ON(!buscfg))
568 		return -EPIPE;
569 
570 	csi2->frame_skip = 0;
571 	v4l2_subdev_call(sensor, sensor, g_skip_frames, &csi2->frame_skip);
572 
573 	csi2->ctrl.vp_out_ctrl =
574 		clamp_t(unsigned int, pipe->l3_ick / pipe->external_rate - 1,
575 			1, 3);
576 	dev_dbg(isp->dev, "%s: l3_ick %lu, external_rate %u, vp_out_ctrl %u\n",
577 		__func__, pipe->l3_ick,  pipe->external_rate,
578 		csi2->ctrl.vp_out_ctrl);
579 	csi2->ctrl.frame_mode = ISP_CSI2_FRAME_IMMEDIATE;
580 	csi2->ctrl.ecc_enable = buscfg->bus.csi2.crc;
581 
582 	timing->ionum = 1;
583 	timing->force_rx_mode = 1;
584 	timing->stop_state_16x = 1;
585 	timing->stop_state_4x = 1;
586 	timing->stop_state_counter = 0x1FF;
587 
588 	/*
589 	 * The CSI2 receiver can't do any format conversion except DPCM
590 	 * decompression, so every set_format call configures both pads
591 	 * and enables DPCM decompression as a special case:
592 	 */
593 	if (csi2->formats[CSI2_PAD_SINK].code !=
594 	    csi2->formats[CSI2_PAD_SOURCE].code)
595 		csi2->dpcm_decompress = true;
596 	else
597 		csi2->dpcm_decompress = false;
598 
599 	csi2->contexts[0].format_id = csi2_ctx_map_format(csi2);
600 
601 	if (csi2->video_out.bpl_padding == 0)
602 		csi2->contexts[0].data_offset = 0;
603 	else
604 		csi2->contexts[0].data_offset = csi2->video_out.bpl_value;
605 
606 	/*
607 	 * Enable end of frame and end of line signals generation for
608 	 * context 0. These signals are generated from CSI2 receiver to
609 	 * qualify the last pixel of a frame and the last pixel of a line.
610 	 * Without enabling the signals CSI2 receiver writes data to memory
611 	 * beyond buffer size and/or data line offset is not handled correctly.
612 	 */
613 	csi2->contexts[0].eof_enabled = 1;
614 	csi2->contexts[0].eol_enabled = 1;
615 
616 	csi2_irq_complexio1_set(isp, csi2, 1);
617 	csi2_irq_ctx_set(isp, csi2, 1);
618 	csi2_irq_status_set(isp, csi2, 1);
619 
620 	/* Set configuration (timings, format and links) */
621 	csi2_timing_config(isp, csi2, timing);
622 	csi2_recv_config(isp, csi2, &csi2->ctrl);
623 	csi2_ctx_config(isp, csi2, &csi2->contexts[0]);
624 
625 	return 0;
626 }
627 
628 /*
629  * csi2_print_status - Prints CSI2 debug information.
630  */
631 #define CSI2_PRINT_REGISTER(isp, regs, name)\
632 	dev_dbg(isp->dev, "###CSI2 " #name "=0x%08x\n", \
633 		isp_reg_readl(isp, regs, ISPCSI2_##name))
634 
635 static void csi2_print_status(struct isp_csi2_device *csi2)
636 {
637 	struct isp_device *isp = csi2->isp;
638 
639 	if (!csi2->available)
640 		return;
641 
642 	dev_dbg(isp->dev, "-------------CSI2 Register dump-------------\n");
643 
644 	CSI2_PRINT_REGISTER(isp, csi2->regs1, SYSCONFIG);
645 	CSI2_PRINT_REGISTER(isp, csi2->regs1, SYSSTATUS);
646 	CSI2_PRINT_REGISTER(isp, csi2->regs1, IRQENABLE);
647 	CSI2_PRINT_REGISTER(isp, csi2->regs1, IRQSTATUS);
648 	CSI2_PRINT_REGISTER(isp, csi2->regs1, CTRL);
649 	CSI2_PRINT_REGISTER(isp, csi2->regs1, DBG_H);
650 	CSI2_PRINT_REGISTER(isp, csi2->regs1, GNQ);
651 	CSI2_PRINT_REGISTER(isp, csi2->regs1, PHY_CFG);
652 	CSI2_PRINT_REGISTER(isp, csi2->regs1, PHY_IRQSTATUS);
653 	CSI2_PRINT_REGISTER(isp, csi2->regs1, SHORT_PACKET);
654 	CSI2_PRINT_REGISTER(isp, csi2->regs1, PHY_IRQENABLE);
655 	CSI2_PRINT_REGISTER(isp, csi2->regs1, DBG_P);
656 	CSI2_PRINT_REGISTER(isp, csi2->regs1, TIMING);
657 	CSI2_PRINT_REGISTER(isp, csi2->regs1, CTX_CTRL1(0));
658 	CSI2_PRINT_REGISTER(isp, csi2->regs1, CTX_CTRL2(0));
659 	CSI2_PRINT_REGISTER(isp, csi2->regs1, CTX_DAT_OFST(0));
660 	CSI2_PRINT_REGISTER(isp, csi2->regs1, CTX_DAT_PING_ADDR(0));
661 	CSI2_PRINT_REGISTER(isp, csi2->regs1, CTX_DAT_PONG_ADDR(0));
662 	CSI2_PRINT_REGISTER(isp, csi2->regs1, CTX_IRQENABLE(0));
663 	CSI2_PRINT_REGISTER(isp, csi2->regs1, CTX_IRQSTATUS(0));
664 	CSI2_PRINT_REGISTER(isp, csi2->regs1, CTX_CTRL3(0));
665 
666 	dev_dbg(isp->dev, "--------------------------------------------\n");
667 }
668 
669 /* -----------------------------------------------------------------------------
670  * Interrupt handling
671  */
672 
673 /*
674  * csi2_isr_buffer - Does buffer handling at end-of-frame
675  * when writing to memory.
676  */
677 static void csi2_isr_buffer(struct isp_csi2_device *csi2)
678 {
679 	struct isp_device *isp = csi2->isp;
680 	struct isp_buffer *buffer;
681 
682 	csi2_ctx_enable(isp, csi2, 0, 0);
683 
684 	buffer = omap3isp_video_buffer_next(&csi2->video_out);
685 
686 	/*
687 	 * Let video queue operation restart engine if there is an underrun
688 	 * condition.
689 	 */
690 	if (buffer == NULL)
691 		return;
692 
693 	csi2_set_outaddr(csi2, buffer->dma);
694 	csi2_ctx_enable(isp, csi2, 0, 1);
695 }
696 
697 static void csi2_isr_ctx(struct isp_csi2_device *csi2,
698 			 struct isp_csi2_ctx_cfg *ctx)
699 {
700 	struct isp_device *isp = csi2->isp;
701 	unsigned int n = ctx->ctxnum;
702 	u32 status;
703 
704 	status = isp_reg_readl(isp, csi2->regs1, ISPCSI2_CTX_IRQSTATUS(n));
705 	isp_reg_writel(isp, status, csi2->regs1, ISPCSI2_CTX_IRQSTATUS(n));
706 
707 	if (!(status & ISPCSI2_CTX_IRQSTATUS_FE_IRQ))
708 		return;
709 
710 	/* Skip interrupts until we reach the frame skip count. The CSI2 will be
711 	 * automatically disabled, as the frame skip count has been programmed
712 	 * in the CSI2_CTx_CTRL1::COUNT field, so re-enable it.
713 	 *
714 	 * It would have been nice to rely on the FRAME_NUMBER interrupt instead
715 	 * but it turned out that the interrupt is only generated when the CSI2
716 	 * writes to memory (the CSI2_CTx_CTRL1::COUNT field is decreased
717 	 * correctly and reaches 0 when data is forwarded to the video port only
718 	 * but no interrupt arrives). Maybe a CSI2 hardware bug.
719 	 */
720 	if (csi2->frame_skip) {
721 		csi2->frame_skip--;
722 		if (csi2->frame_skip == 0) {
723 			ctx->format_id = csi2_ctx_map_format(csi2);
724 			csi2_ctx_config(isp, csi2, ctx);
725 			csi2_ctx_enable(isp, csi2, n, 1);
726 		}
727 		return;
728 	}
729 
730 	if (csi2->output & CSI2_OUTPUT_MEMORY)
731 		csi2_isr_buffer(csi2);
732 }
733 
734 /*
735  * omap3isp_csi2_isr - CSI2 interrupt handling.
736  */
737 void omap3isp_csi2_isr(struct isp_csi2_device *csi2)
738 {
739 	struct isp_pipeline *pipe = to_isp_pipeline(&csi2->subdev.entity);
740 	u32 csi2_irqstatus, cpxio1_irqstatus;
741 	struct isp_device *isp = csi2->isp;
742 
743 	if (!csi2->available)
744 		return;
745 
746 	csi2_irqstatus = isp_reg_readl(isp, csi2->regs1, ISPCSI2_IRQSTATUS);
747 	isp_reg_writel(isp, csi2_irqstatus, csi2->regs1, ISPCSI2_IRQSTATUS);
748 
749 	/* Failure Cases */
750 	if (csi2_irqstatus & ISPCSI2_IRQSTATUS_COMPLEXIO1_ERR_IRQ) {
751 		cpxio1_irqstatus = isp_reg_readl(isp, csi2->regs1,
752 						 ISPCSI2_PHY_IRQSTATUS);
753 		isp_reg_writel(isp, cpxio1_irqstatus,
754 			       csi2->regs1, ISPCSI2_PHY_IRQSTATUS);
755 		dev_dbg(isp->dev, "CSI2: ComplexIO Error IRQ %x\n",
756 			cpxio1_irqstatus);
757 		pipe->error = true;
758 	}
759 
760 	if (csi2_irqstatus & (ISPCSI2_IRQSTATUS_OCP_ERR_IRQ |
761 			      ISPCSI2_IRQSTATUS_SHORT_PACKET_IRQ |
762 			      ISPCSI2_IRQSTATUS_ECC_NO_CORRECTION_IRQ |
763 			      ISPCSI2_IRQSTATUS_COMPLEXIO2_ERR_IRQ |
764 			      ISPCSI2_IRQSTATUS_FIFO_OVF_IRQ)) {
765 		dev_dbg(isp->dev,
766 			"CSI2 Err: OCP:%d, Short_pack:%d, ECC:%d, CPXIO2:%d, FIFO_OVF:%d,\n",
767 			(csi2_irqstatus &
768 			 ISPCSI2_IRQSTATUS_OCP_ERR_IRQ) ? 1 : 0,
769 			(csi2_irqstatus &
770 			 ISPCSI2_IRQSTATUS_SHORT_PACKET_IRQ) ? 1 : 0,
771 			(csi2_irqstatus &
772 			 ISPCSI2_IRQSTATUS_ECC_NO_CORRECTION_IRQ) ? 1 : 0,
773 			(csi2_irqstatus &
774 			 ISPCSI2_IRQSTATUS_COMPLEXIO2_ERR_IRQ) ? 1 : 0,
775 			(csi2_irqstatus &
776 			 ISPCSI2_IRQSTATUS_FIFO_OVF_IRQ) ? 1 : 0);
777 		pipe->error = true;
778 	}
779 
780 	if (omap3isp_module_sync_is_stopping(&csi2->wait, &csi2->stopping))
781 		return;
782 
783 	/* Successful cases */
784 	if (csi2_irqstatus & ISPCSI2_IRQSTATUS_CONTEXT(0))
785 		csi2_isr_ctx(csi2, &csi2->contexts[0]);
786 
787 	if (csi2_irqstatus & ISPCSI2_IRQSTATUS_ECC_CORRECTION_IRQ)
788 		dev_dbg(isp->dev, "CSI2: ECC correction done\n");
789 }
790 
791 /* -----------------------------------------------------------------------------
792  * ISP video operations
793  */
794 
795 /*
796  * csi2_queue - Queues the first buffer when using memory output
797  * @video: The video node
798  * @buffer: buffer to queue
799  */
800 static int csi2_queue(struct isp_video *video, struct isp_buffer *buffer)
801 {
802 	struct isp_device *isp = video->isp;
803 	struct isp_csi2_device *csi2 = &isp->isp_csi2a;
804 
805 	csi2_set_outaddr(csi2, buffer->dma);
806 
807 	/*
808 	 * If streaming was enabled before there was a buffer queued
809 	 * or underrun happened in the ISR, the hardware was not enabled
810 	 * and DMA queue flag ISP_VIDEO_DMAQUEUE_UNDERRUN is still set.
811 	 * Enable it now.
812 	 */
813 	if (csi2->video_out.dmaqueue_flags & ISP_VIDEO_DMAQUEUE_UNDERRUN) {
814 		/* Enable / disable context 0 and IRQs */
815 		csi2_if_enable(isp, csi2, 1);
816 		csi2_ctx_enable(isp, csi2, 0, 1);
817 		isp_video_dmaqueue_flags_clr(&csi2->video_out);
818 	}
819 
820 	return 0;
821 }
822 
823 static const struct isp_video_operations csi2_ispvideo_ops = {
824 	.queue = csi2_queue,
825 };
826 
827 /* -----------------------------------------------------------------------------
828  * V4L2 subdev operations
829  */
830 
831 static struct v4l2_mbus_framefmt *
832 __csi2_get_format(struct isp_csi2_device *csi2,
833 		  struct v4l2_subdev_state *sd_state,
834 		  unsigned int pad, enum v4l2_subdev_format_whence which)
835 {
836 	if (which == V4L2_SUBDEV_FORMAT_TRY)
837 		return v4l2_subdev_get_try_format(&csi2->subdev, sd_state,
838 						  pad);
839 	else
840 		return &csi2->formats[pad];
841 }
842 
843 static void
844 csi2_try_format(struct isp_csi2_device *csi2,
845 		struct v4l2_subdev_state *sd_state,
846 		unsigned int pad, struct v4l2_mbus_framefmt *fmt,
847 		enum v4l2_subdev_format_whence which)
848 {
849 	u32 pixelcode;
850 	struct v4l2_mbus_framefmt *format;
851 	const struct isp_format_info *info;
852 	unsigned int i;
853 
854 	switch (pad) {
855 	case CSI2_PAD_SINK:
856 		/* Clamp the width and height to valid range (1-8191). */
857 		for (i = 0; i < ARRAY_SIZE(csi2_input_fmts); i++) {
858 			if (fmt->code == csi2_input_fmts[i])
859 				break;
860 		}
861 
862 		/* If not found, use SGRBG10 as default */
863 		if (i >= ARRAY_SIZE(csi2_input_fmts))
864 			fmt->code = MEDIA_BUS_FMT_SGRBG10_1X10;
865 
866 		fmt->width = clamp_t(u32, fmt->width, 1, 8191);
867 		fmt->height = clamp_t(u32, fmt->height, 1, 8191);
868 		break;
869 
870 	case CSI2_PAD_SOURCE:
871 		/* Source format same as sink format, except for DPCM
872 		 * compression.
873 		 */
874 		pixelcode = fmt->code;
875 		format = __csi2_get_format(csi2, sd_state, CSI2_PAD_SINK,
876 					   which);
877 		memcpy(fmt, format, sizeof(*fmt));
878 
879 		/*
880 		 * Only Allow DPCM decompression, and check that the
881 		 * pattern is preserved
882 		 */
883 		info = omap3isp_video_format_info(fmt->code);
884 		if (info->uncompressed == pixelcode)
885 			fmt->code = pixelcode;
886 		break;
887 	}
888 
889 	/* RGB, non-interlaced */
890 	fmt->colorspace = V4L2_COLORSPACE_SRGB;
891 	fmt->field = V4L2_FIELD_NONE;
892 }
893 
894 /*
895  * csi2_enum_mbus_code - Handle pixel format enumeration
896  * @sd     : pointer to v4l2 subdev structure
897  * @cfg: V4L2 subdev pad configuration
898  * @code   : pointer to v4l2_subdev_mbus_code_enum structure
899  * return -EINVAL or zero on success
900  */
901 static int csi2_enum_mbus_code(struct v4l2_subdev *sd,
902 			       struct v4l2_subdev_state *sd_state,
903 			       struct v4l2_subdev_mbus_code_enum *code)
904 {
905 	struct isp_csi2_device *csi2 = v4l2_get_subdevdata(sd);
906 	struct v4l2_mbus_framefmt *format;
907 	const struct isp_format_info *info;
908 
909 	if (code->pad == CSI2_PAD_SINK) {
910 		if (code->index >= ARRAY_SIZE(csi2_input_fmts))
911 			return -EINVAL;
912 
913 		code->code = csi2_input_fmts[code->index];
914 	} else {
915 		format = __csi2_get_format(csi2, sd_state, CSI2_PAD_SINK,
916 					   code->which);
917 		switch (code->index) {
918 		case 0:
919 			/* Passthrough sink pad code */
920 			code->code = format->code;
921 			break;
922 		case 1:
923 			/* Uncompressed code */
924 			info = omap3isp_video_format_info(format->code);
925 			if (info->uncompressed == format->code)
926 				return -EINVAL;
927 
928 			code->code = info->uncompressed;
929 			break;
930 		default:
931 			return -EINVAL;
932 		}
933 	}
934 
935 	return 0;
936 }
937 
938 static int csi2_enum_frame_size(struct v4l2_subdev *sd,
939 				struct v4l2_subdev_state *sd_state,
940 				struct v4l2_subdev_frame_size_enum *fse)
941 {
942 	struct isp_csi2_device *csi2 = v4l2_get_subdevdata(sd);
943 	struct v4l2_mbus_framefmt format;
944 
945 	if (fse->index != 0)
946 		return -EINVAL;
947 
948 	format.code = fse->code;
949 	format.width = 1;
950 	format.height = 1;
951 	csi2_try_format(csi2, sd_state, fse->pad, &format, fse->which);
952 	fse->min_width = format.width;
953 	fse->min_height = format.height;
954 
955 	if (format.code != fse->code)
956 		return -EINVAL;
957 
958 	format.code = fse->code;
959 	format.width = -1;
960 	format.height = -1;
961 	csi2_try_format(csi2, sd_state, fse->pad, &format, fse->which);
962 	fse->max_width = format.width;
963 	fse->max_height = format.height;
964 
965 	return 0;
966 }
967 
968 /*
969  * csi2_get_format - Handle get format by pads subdev method
970  * @sd : pointer to v4l2 subdev structure
971  * @cfg: V4L2 subdev pad configuration
972  * @fmt: pointer to v4l2 subdev format structure
973  * return -EINVAL or zero on success
974  */
975 static int csi2_get_format(struct v4l2_subdev *sd,
976 			   struct v4l2_subdev_state *sd_state,
977 			   struct v4l2_subdev_format *fmt)
978 {
979 	struct isp_csi2_device *csi2 = v4l2_get_subdevdata(sd);
980 	struct v4l2_mbus_framefmt *format;
981 
982 	format = __csi2_get_format(csi2, sd_state, fmt->pad, fmt->which);
983 	if (format == NULL)
984 		return -EINVAL;
985 
986 	fmt->format = *format;
987 	return 0;
988 }
989 
990 /*
991  * csi2_set_format - Handle set format by pads subdev method
992  * @sd : pointer to v4l2 subdev structure
993  * @cfg: V4L2 subdev pad configuration
994  * @fmt: pointer to v4l2 subdev format structure
995  * return -EINVAL or zero on success
996  */
997 static int csi2_set_format(struct v4l2_subdev *sd,
998 			   struct v4l2_subdev_state *sd_state,
999 			   struct v4l2_subdev_format *fmt)
1000 {
1001 	struct isp_csi2_device *csi2 = v4l2_get_subdevdata(sd);
1002 	struct v4l2_mbus_framefmt *format;
1003 
1004 	format = __csi2_get_format(csi2, sd_state, fmt->pad, fmt->which);
1005 	if (format == NULL)
1006 		return -EINVAL;
1007 
1008 	csi2_try_format(csi2, sd_state, fmt->pad, &fmt->format, fmt->which);
1009 	*format = fmt->format;
1010 
1011 	/* Propagate the format from sink to source */
1012 	if (fmt->pad == CSI2_PAD_SINK) {
1013 		format = __csi2_get_format(csi2, sd_state, CSI2_PAD_SOURCE,
1014 					   fmt->which);
1015 		*format = fmt->format;
1016 		csi2_try_format(csi2, sd_state, CSI2_PAD_SOURCE, format,
1017 				fmt->which);
1018 	}
1019 
1020 	return 0;
1021 }
1022 
1023 /*
1024  * csi2_init_formats - Initialize formats on all pads
1025  * @sd: ISP CSI2 V4L2 subdevice
1026  * @fh: V4L2 subdev file handle
1027  *
1028  * Initialize all pad formats with default values. If fh is not NULL, try
1029  * formats are initialized on the file handle. Otherwise active formats are
1030  * initialized on the device.
1031  */
1032 static int csi2_init_formats(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
1033 {
1034 	struct v4l2_subdev_format format;
1035 
1036 	memset(&format, 0, sizeof(format));
1037 	format.pad = CSI2_PAD_SINK;
1038 	format.which = fh ? V4L2_SUBDEV_FORMAT_TRY : V4L2_SUBDEV_FORMAT_ACTIVE;
1039 	format.format.code = MEDIA_BUS_FMT_SGRBG10_1X10;
1040 	format.format.width = 4096;
1041 	format.format.height = 4096;
1042 	csi2_set_format(sd, fh ? fh->state : NULL, &format);
1043 
1044 	return 0;
1045 }
1046 
1047 /*
1048  * csi2_set_stream - Enable/Disable streaming on the CSI2 module
1049  * @sd: ISP CSI2 V4L2 subdevice
1050  * @enable: ISP pipeline stream state
1051  *
1052  * Return 0 on success or a negative error code otherwise.
1053  */
1054 static int csi2_set_stream(struct v4l2_subdev *sd, int enable)
1055 {
1056 	struct isp_csi2_device *csi2 = v4l2_get_subdevdata(sd);
1057 	struct isp_device *isp = csi2->isp;
1058 	struct isp_video *video_out = &csi2->video_out;
1059 
1060 	switch (enable) {
1061 	case ISP_PIPELINE_STREAM_CONTINUOUS:
1062 		if (omap3isp_csiphy_acquire(csi2->phy, &sd->entity) < 0)
1063 			return -ENODEV;
1064 		if (csi2->output & CSI2_OUTPUT_MEMORY)
1065 			omap3isp_sbl_enable(isp, OMAP3_ISP_SBL_CSI2A_WRITE);
1066 		csi2_configure(csi2);
1067 		csi2_print_status(csi2);
1068 
1069 		/*
1070 		 * When outputting to memory with no buffer available, let the
1071 		 * buffer queue handler start the hardware. A DMA queue flag
1072 		 * ISP_VIDEO_DMAQUEUE_QUEUED will be set as soon as there is
1073 		 * a buffer available.
1074 		 */
1075 		if (csi2->output & CSI2_OUTPUT_MEMORY &&
1076 		    !(video_out->dmaqueue_flags & ISP_VIDEO_DMAQUEUE_QUEUED))
1077 			break;
1078 		/* Enable context 0 and IRQs */
1079 		atomic_set(&csi2->stopping, 0);
1080 		csi2_ctx_enable(isp, csi2, 0, 1);
1081 		csi2_if_enable(isp, csi2, 1);
1082 		isp_video_dmaqueue_flags_clr(video_out);
1083 		break;
1084 
1085 	case ISP_PIPELINE_STREAM_STOPPED:
1086 		if (csi2->state == ISP_PIPELINE_STREAM_STOPPED)
1087 			return 0;
1088 		if (omap3isp_module_sync_idle(&sd->entity, &csi2->wait,
1089 					      &csi2->stopping))
1090 			dev_dbg(isp->dev, "%s: module stop timeout.\n",
1091 				sd->name);
1092 		csi2_ctx_enable(isp, csi2, 0, 0);
1093 		csi2_if_enable(isp, csi2, 0);
1094 		csi2_irq_ctx_set(isp, csi2, 0);
1095 		omap3isp_csiphy_release(csi2->phy);
1096 		isp_video_dmaqueue_flags_clr(video_out);
1097 		omap3isp_sbl_disable(isp, OMAP3_ISP_SBL_CSI2A_WRITE);
1098 		break;
1099 	}
1100 
1101 	csi2->state = enable;
1102 	return 0;
1103 }
1104 
1105 /* subdev video operations */
1106 static const struct v4l2_subdev_video_ops csi2_video_ops = {
1107 	.s_stream = csi2_set_stream,
1108 };
1109 
1110 /* subdev pad operations */
1111 static const struct v4l2_subdev_pad_ops csi2_pad_ops = {
1112 	.enum_mbus_code = csi2_enum_mbus_code,
1113 	.enum_frame_size = csi2_enum_frame_size,
1114 	.get_fmt = csi2_get_format,
1115 	.set_fmt = csi2_set_format,
1116 };
1117 
1118 /* subdev operations */
1119 static const struct v4l2_subdev_ops csi2_ops = {
1120 	.video = &csi2_video_ops,
1121 	.pad = &csi2_pad_ops,
1122 };
1123 
1124 /* subdev internal operations */
1125 static const struct v4l2_subdev_internal_ops csi2_internal_ops = {
1126 	.open = csi2_init_formats,
1127 };
1128 
1129 /* -----------------------------------------------------------------------------
1130  * Media entity operations
1131  */
1132 
1133 /*
1134  * csi2_link_setup - Setup CSI2 connections.
1135  * @entity : Pointer to media entity structure
1136  * @local  : Pointer to local pad array
1137  * @remote : Pointer to remote pad array
1138  * @flags  : Link flags
1139  * return -EINVAL or zero on success
1140  */
1141 static int csi2_link_setup(struct media_entity *entity,
1142 			   const struct media_pad *local,
1143 			   const struct media_pad *remote, u32 flags)
1144 {
1145 	struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
1146 	struct isp_csi2_device *csi2 = v4l2_get_subdevdata(sd);
1147 	struct isp_csi2_ctrl_cfg *ctrl = &csi2->ctrl;
1148 	unsigned int index = local->index;
1149 
1150 	/*
1151 	 * The ISP core doesn't support pipelines with multiple video outputs.
1152 	 * Revisit this when it will be implemented, and return -EBUSY for now.
1153 	 */
1154 
1155 	/* FIXME: this is actually a hack! */
1156 	if (is_media_entity_v4l2_subdev(remote->entity))
1157 		index |= 2 << 16;
1158 
1159 	switch (index) {
1160 	case CSI2_PAD_SOURCE:
1161 		if (flags & MEDIA_LNK_FL_ENABLED) {
1162 			if (csi2->output & ~CSI2_OUTPUT_MEMORY)
1163 				return -EBUSY;
1164 			csi2->output |= CSI2_OUTPUT_MEMORY;
1165 		} else {
1166 			csi2->output &= ~CSI2_OUTPUT_MEMORY;
1167 		}
1168 		break;
1169 
1170 	case CSI2_PAD_SOURCE | 2 << 16:
1171 		if (flags & MEDIA_LNK_FL_ENABLED) {
1172 			if (csi2->output & ~CSI2_OUTPUT_CCDC)
1173 				return -EBUSY;
1174 			csi2->output |= CSI2_OUTPUT_CCDC;
1175 		} else {
1176 			csi2->output &= ~CSI2_OUTPUT_CCDC;
1177 		}
1178 		break;
1179 
1180 	default:
1181 		/* Link from camera to CSI2 is fixed... */
1182 		return -EINVAL;
1183 	}
1184 
1185 	ctrl->vp_only_enable =
1186 		(csi2->output & CSI2_OUTPUT_MEMORY) ? false : true;
1187 	ctrl->vp_clk_enable = !!(csi2->output & CSI2_OUTPUT_CCDC);
1188 
1189 	return 0;
1190 }
1191 
1192 /* media operations */
1193 static const struct media_entity_operations csi2_media_ops = {
1194 	.link_setup = csi2_link_setup,
1195 	.link_validate = v4l2_subdev_link_validate,
1196 };
1197 
1198 void omap3isp_csi2_unregister_entities(struct isp_csi2_device *csi2)
1199 {
1200 	v4l2_device_unregister_subdev(&csi2->subdev);
1201 	omap3isp_video_unregister(&csi2->video_out);
1202 }
1203 
1204 int omap3isp_csi2_register_entities(struct isp_csi2_device *csi2,
1205 				    struct v4l2_device *vdev)
1206 {
1207 	int ret;
1208 
1209 	/* Register the subdev and video nodes. */
1210 	csi2->subdev.dev = vdev->mdev->dev;
1211 	ret = v4l2_device_register_subdev(vdev, &csi2->subdev);
1212 	if (ret < 0)
1213 		goto error;
1214 
1215 	ret = omap3isp_video_register(&csi2->video_out, vdev);
1216 	if (ret < 0)
1217 		goto error;
1218 
1219 	return 0;
1220 
1221 error:
1222 	omap3isp_csi2_unregister_entities(csi2);
1223 	return ret;
1224 }
1225 
1226 /* -----------------------------------------------------------------------------
1227  * ISP CSI2 initialisation and cleanup
1228  */
1229 
1230 /*
1231  * csi2_init_entities - Initialize subdev and media entity.
1232  * @csi2: Pointer to csi2 structure.
1233  * return -ENOMEM or zero on success
1234  */
1235 static int csi2_init_entities(struct isp_csi2_device *csi2)
1236 {
1237 	struct v4l2_subdev *sd = &csi2->subdev;
1238 	struct media_pad *pads = csi2->pads;
1239 	struct media_entity *me = &sd->entity;
1240 	int ret;
1241 
1242 	v4l2_subdev_init(sd, &csi2_ops);
1243 	sd->internal_ops = &csi2_internal_ops;
1244 	strscpy(sd->name, "OMAP3 ISP CSI2a", sizeof(sd->name));
1245 
1246 	sd->grp_id = 1 << 16;	/* group ID for isp subdevs */
1247 	v4l2_set_subdevdata(sd, csi2);
1248 	sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
1249 
1250 	pads[CSI2_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
1251 	pads[CSI2_PAD_SINK].flags = MEDIA_PAD_FL_SINK
1252 				    | MEDIA_PAD_FL_MUST_CONNECT;
1253 
1254 	me->ops = &csi2_media_ops;
1255 	ret = media_entity_pads_init(me, CSI2_PADS_NUM, pads);
1256 	if (ret < 0)
1257 		return ret;
1258 
1259 	csi2_init_formats(sd, NULL);
1260 
1261 	/* Video device node */
1262 	csi2->video_out.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1263 	csi2->video_out.ops = &csi2_ispvideo_ops;
1264 	csi2->video_out.bpl_alignment = 32;
1265 	csi2->video_out.bpl_zero_padding = 1;
1266 	csi2->video_out.bpl_max = 0x1ffe0;
1267 	csi2->video_out.isp = csi2->isp;
1268 	csi2->video_out.capture_mem = PAGE_ALIGN(4096 * 4096) * 3;
1269 
1270 	ret = omap3isp_video_init(&csi2->video_out, "CSI2a");
1271 	if (ret < 0)
1272 		goto error_video;
1273 
1274 	return 0;
1275 
1276 error_video:
1277 	media_entity_cleanup(&csi2->subdev.entity);
1278 	return ret;
1279 }
1280 
1281 /*
1282  * omap3isp_csi2_init - Routine for module driver init
1283  */
1284 int omap3isp_csi2_init(struct isp_device *isp)
1285 {
1286 	struct isp_csi2_device *csi2a = &isp->isp_csi2a;
1287 	struct isp_csi2_device *csi2c = &isp->isp_csi2c;
1288 	int ret;
1289 
1290 	csi2a->isp = isp;
1291 	csi2a->available = 1;
1292 	csi2a->regs1 = OMAP3_ISP_IOMEM_CSI2A_REGS1;
1293 	csi2a->regs2 = OMAP3_ISP_IOMEM_CSI2A_REGS2;
1294 	csi2a->phy = &isp->isp_csiphy2;
1295 	csi2a->state = ISP_PIPELINE_STREAM_STOPPED;
1296 	init_waitqueue_head(&csi2a->wait);
1297 
1298 	ret = csi2_init_entities(csi2a);
1299 	if (ret < 0)
1300 		return ret;
1301 
1302 	if (isp->revision == ISP_REVISION_15_0) {
1303 		csi2c->isp = isp;
1304 		csi2c->available = 1;
1305 		csi2c->regs1 = OMAP3_ISP_IOMEM_CSI2C_REGS1;
1306 		csi2c->regs2 = OMAP3_ISP_IOMEM_CSI2C_REGS2;
1307 		csi2c->phy = &isp->isp_csiphy1;
1308 		csi2c->state = ISP_PIPELINE_STREAM_STOPPED;
1309 		init_waitqueue_head(&csi2c->wait);
1310 	}
1311 
1312 	return 0;
1313 }
1314 
1315 /*
1316  * omap3isp_csi2_cleanup - Routine for module driver cleanup
1317  */
1318 void omap3isp_csi2_cleanup(struct isp_device *isp)
1319 {
1320 	struct isp_csi2_device *csi2a = &isp->isp_csi2a;
1321 
1322 	omap3isp_video_cleanup(&csi2a->video_out);
1323 	media_entity_cleanup(&csi2a->subdev.entity);
1324 }
1325