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mm: vma_adjust: remove superfluous check for next not NULL
[linux/fpc-iii.git] / drivers / dma / ipu / ipu_idmac.c
blobed76044ce4b92a41bccfd0169df7df66b58841ca
1 /*
2 * Copyright (C) 2008
3 * Guennadi Liakhovetski, DENX Software Engineering, <lg@denx.de>
4 *
5 * Copyright (C) 2005-2007 Freescale Semiconductor, Inc. All Rights Reserved.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12 #include <linux/dma-mapping.h>
13 #include <linux/init.h>
14 #include <linux/platform_device.h>
15 #include <linux/err.h>
16 #include <linux/spinlock.h>
17 #include <linux/delay.h>
18 #include <linux/list.h>
19 #include <linux/clk.h>
20 #include <linux/vmalloc.h>
21 #include <linux/string.h>
22 #include <linux/interrupt.h>
23 #include <linux/io.h>
24 #include <linux/module.h>
25 #include <linux/dma/ipu-dma.h>
26
27 #include "../dmaengine.h"
28 #include "ipu_intern.h"
29
30 #define FS_VF_IN_VALID 0x00000002
31 #define FS_ENC_IN_VALID 0x00000001
32
33 static int ipu_disable_channel(struct idmac *idmac, struct idmac_channel *ichan,
34 bool wait_for_stop);
35
36 /*
37 * There can be only one, we could allocate it dynamically, but then we'd have
38 * to add an extra parameter to some functions, and use something as ugly as
39 * struct ipu *ipu = to_ipu(to_idmac(ichan->dma_chan.device));
40 * in the ISR
41 */
42 static struct ipu ipu_data;
43
44 #define to_ipu(id) container_of(id, struct ipu, idmac)
45
46 static u32 __idmac_read_icreg(struct ipu *ipu, unsigned long reg)
47 {
48 return __raw_readl(ipu->reg_ic + reg);
49 }
50
51 #define idmac_read_icreg(ipu, reg) __idmac_read_icreg(ipu, reg - IC_CONF)
52
53 static void __idmac_write_icreg(struct ipu *ipu, u32 value, unsigned long reg)
54 {
55 __raw_writel(value, ipu->reg_ic + reg);
56 }
57
58 #define idmac_write_icreg(ipu, v, reg) __idmac_write_icreg(ipu, v, reg - IC_CONF)
59
60 static u32 idmac_read_ipureg(struct ipu *ipu, unsigned long reg)
61 {
62 return __raw_readl(ipu->reg_ipu + reg);
63 }
64
65 static void idmac_write_ipureg(struct ipu *ipu, u32 value, unsigned long reg)
66 {
67 __raw_writel(value, ipu->reg_ipu + reg);
68 }
69
70 /*****************************************************************************
71 * IPU / IC common functions
72 */
73 static void dump_idmac_reg(struct ipu *ipu)
74 {
75 dev_dbg(ipu->dev, "IDMAC_CONF 0x%x, IC_CONF 0x%x, IDMAC_CHA_EN 0x%x, "
76 "IDMAC_CHA_PRI 0x%x, IDMAC_CHA_BUSY 0x%x\n",
77 idmac_read_icreg(ipu, IDMAC_CONF),
78 idmac_read_icreg(ipu, IC_CONF),
79 idmac_read_icreg(ipu, IDMAC_CHA_EN),
80 idmac_read_icreg(ipu, IDMAC_CHA_PRI),
81 idmac_read_icreg(ipu, IDMAC_CHA_BUSY));
82 dev_dbg(ipu->dev, "BUF0_RDY 0x%x, BUF1_RDY 0x%x, CUR_BUF 0x%x, "
83 "DB_MODE 0x%x, TASKS_STAT 0x%x\n",
84 idmac_read_ipureg(ipu, IPU_CHA_BUF0_RDY),
85 idmac_read_ipureg(ipu, IPU_CHA_BUF1_RDY),
86 idmac_read_ipureg(ipu, IPU_CHA_CUR_BUF),
87 idmac_read_ipureg(ipu, IPU_CHA_DB_MODE_SEL),
88 idmac_read_ipureg(ipu, IPU_TASKS_STAT));
89 }
90
91 static uint32_t bytes_per_pixel(enum pixel_fmt fmt)
92 {
93 switch (fmt) {
94 case IPU_PIX_FMT_GENERIC: /* generic data */
95 case IPU_PIX_FMT_RGB332:
96 case IPU_PIX_FMT_YUV420P:
97 case IPU_PIX_FMT_YUV422P:
98 default:
99 return 1;
100 case IPU_PIX_FMT_RGB565:
101 case IPU_PIX_FMT_YUYV:
102 case IPU_PIX_FMT_UYVY:
103 return 2;
104 case IPU_PIX_FMT_BGR24:
105 case IPU_PIX_FMT_RGB24:
106 return 3;
107 case IPU_PIX_FMT_GENERIC_32: /* generic data */
108 case IPU_PIX_FMT_BGR32:
109 case IPU_PIX_FMT_RGB32:
110 case IPU_PIX_FMT_ABGR32:
111 return 4;
112 }
113 }
114
115 /* Enable direct write to memory by the Camera Sensor Interface */
116 static void ipu_ic_enable_task(struct ipu *ipu, enum ipu_channel channel)
117 {
118 uint32_t ic_conf, mask;
119
120 switch (channel) {
121 case IDMAC_IC_0:
122 mask = IC_CONF_PRPENC_EN;
123 break;
124 case IDMAC_IC_7:
125 mask = IC_CONF_RWS_EN | IC_CONF_PRPENC_EN;
126 break;
127 default:
128 return;
129 }
130 ic_conf = idmac_read_icreg(ipu, IC_CONF) | mask;
131 idmac_write_icreg(ipu, ic_conf, IC_CONF);
132 }
133
134 /* Called under spin_lock_irqsave(&ipu_data.lock) */
135 static void ipu_ic_disable_task(struct ipu *ipu, enum ipu_channel channel)
136 {
137 uint32_t ic_conf, mask;
138
139 switch (channel) {
140 case IDMAC_IC_0:
141 mask = IC_CONF_PRPENC_EN;
142 break;
143 case IDMAC_IC_7:
144 mask = IC_CONF_RWS_EN | IC_CONF_PRPENC_EN;
145 break;
146 default:
147 return;
148 }
149 ic_conf = idmac_read_icreg(ipu, IC_CONF) & ~mask;
150 idmac_write_icreg(ipu, ic_conf, IC_CONF);
151 }
152
153 static uint32_t ipu_channel_status(struct ipu *ipu, enum ipu_channel channel)
154 {
155 uint32_t stat = TASK_STAT_IDLE;
156 uint32_t task_stat_reg = idmac_read_ipureg(ipu, IPU_TASKS_STAT);
157
158 switch (channel) {
159 case IDMAC_IC_7:
160 stat = (task_stat_reg & TSTAT_CSI2MEM_MASK) >>
161 TSTAT_CSI2MEM_OFFSET;
162 break;
163 case IDMAC_IC_0:
164 case IDMAC_SDC_0:
165 case IDMAC_SDC_1:
166 default:
167 break;
168 }
169 return stat;
170 }
171
172 struct chan_param_mem_planar {
173 /* Word 0 */
174 u32 xv:10;
175 u32 yv:10;
176 u32 xb:12;
177
178 u32 yb:12;
179 u32 res1:2;
180 u32 nsb:1;
181 u32 lnpb:6;
182 u32 ubo_l:11;
183
184 u32 ubo_h:15;
185 u32 vbo_l:17;
186
187 u32 vbo_h:9;
188 u32 res2:3;
189 u32 fw:12;
190 u32 fh_l:8;
191
192 u32 fh_h:4;
193 u32 res3:28;
194
195 /* Word 1 */
196 u32 eba0;
197
198 u32 eba1;
199
200 u32 bpp:3;
201 u32 sl:14;
202 u32 pfs:3;
203 u32 bam:3;
204 u32 res4:2;
205 u32 npb:6;
206 u32 res5:1;
207
208 u32 sat:2;
209 u32 res6:30;
210 } __attribute__ ((packed));
211
212 struct chan_param_mem_interleaved {
213 /* Word 0 */
214 u32 xv:10;
215 u32 yv:10;
216 u32 xb:12;
217
218 u32 yb:12;
219 u32 sce:1;
220 u32 res1:1;
221 u32 nsb:1;
222 u32 lnpb:6;
223 u32 sx:10;
224 u32 sy_l:1;
225
226 u32 sy_h:9;
227 u32 ns:10;
228 u32 sm:10;
229 u32 sdx_l:3;
230
231 u32 sdx_h:2;
232 u32 sdy:5;
233 u32 sdrx:1;
234 u32 sdry:1;
235 u32 sdr1:1;
236 u32 res2:2;
237 u32 fw:12;
238 u32 fh_l:8;
239
240 u32 fh_h:4;
241 u32 res3:28;
242
243 /* Word 1 */
244 u32 eba0;
245
246 u32 eba1;
247
248 u32 bpp:3;
249 u32 sl:14;
250 u32 pfs:3;
251 u32 bam:3;
252 u32 res4:2;
253 u32 npb:6;
254 u32 res5:1;
255
256 u32 sat:2;
257 u32 scc:1;
258 u32 ofs0:5;
259 u32 ofs1:5;
260 u32 ofs2:5;
261 u32 ofs3:5;
262 u32 wid0:3;
263 u32 wid1:3;
264 u32 wid2:3;
265
266 u32 wid3:3;
267 u32 dec_sel:1;
268 u32 res6:28;
269 } __attribute__ ((packed));
270
271 union chan_param_mem {
272 struct chan_param_mem_planar pp;
273 struct chan_param_mem_interleaved ip;
274 };
275
276 static void ipu_ch_param_set_plane_offset(union chan_param_mem *params,
277 u32 u_offset, u32 v_offset)
278 {
279 params->pp.ubo_l = u_offset & 0x7ff;
280 params->pp.ubo_h = u_offset >> 11;
281 params->pp.vbo_l = v_offset & 0x1ffff;
282 params->pp.vbo_h = v_offset >> 17;
283 }
284
285 static void ipu_ch_param_set_size(union chan_param_mem *params,
286 uint32_t pixel_fmt, uint16_t width,
287 uint16_t height, uint16_t stride)
288 {
289 u32 u_offset;
290 u32 v_offset;
291
292 params->pp.fw = width - 1;
293 params->pp.fh_l = height - 1;
294 params->pp.fh_h = (height - 1) >> 8;
295 params->pp.sl = stride - 1;
296
297 switch (pixel_fmt) {
298 case IPU_PIX_FMT_GENERIC:
299 /*Represents 8-bit Generic data */
300 params->pp.bpp = 3;
301 params->pp.pfs = 7;
302 params->pp.npb = 31;
303 params->pp.sat = 2; /* SAT = use 32-bit access */
304 break;
305 case IPU_PIX_FMT_GENERIC_32:
306 /*Represents 32-bit Generic data */
307 params->pp.bpp = 0;
308 params->pp.pfs = 7;
309 params->pp.npb = 7;
310 params->pp.sat = 2; /* SAT = use 32-bit access */
311 break;
312 case IPU_PIX_FMT_RGB565:
313 params->ip.bpp = 2;
314 params->ip.pfs = 4;
315 params->ip.npb = 15;
316 params->ip.sat = 2; /* SAT = 32-bit access */
317 params->ip.ofs0 = 0; /* Red bit offset */
318 params->ip.ofs1 = 5; /* Green bit offset */
319 params->ip.ofs2 = 11; /* Blue bit offset */
320 params->ip.ofs3 = 16; /* Alpha bit offset */
321 params->ip.wid0 = 4; /* Red bit width - 1 */
322 params->ip.wid1 = 5; /* Green bit width - 1 */
323 params->ip.wid2 = 4; /* Blue bit width - 1 */
324 break;
325 case IPU_PIX_FMT_BGR24:
326 params->ip.bpp = 1; /* 24 BPP & RGB PFS */
327 params->ip.pfs = 4;
328 params->ip.npb = 7;
329 params->ip.sat = 2; /* SAT = 32-bit access */
330 params->ip.ofs0 = 0; /* Red bit offset */
331 params->ip.ofs1 = 8; /* Green bit offset */
332 params->ip.ofs2 = 16; /* Blue bit offset */
333 params->ip.ofs3 = 24; /* Alpha bit offset */
334 params->ip.wid0 = 7; /* Red bit width - 1 */
335 params->ip.wid1 = 7; /* Green bit width - 1 */
336 params->ip.wid2 = 7; /* Blue bit width - 1 */
337 break;
338 case IPU_PIX_FMT_RGB24:
339 params->ip.bpp = 1; /* 24 BPP & RGB PFS */
340 params->ip.pfs = 4;
341 params->ip.npb = 7;
342 params->ip.sat = 2; /* SAT = 32-bit access */
343 params->ip.ofs0 = 16; /* Red bit offset */
344 params->ip.ofs1 = 8; /* Green bit offset */
345 params->ip.ofs2 = 0; /* Blue bit offset */
346 params->ip.ofs3 = 24; /* Alpha bit offset */
347 params->ip.wid0 = 7; /* Red bit width - 1 */
348 params->ip.wid1 = 7; /* Green bit width - 1 */
349 params->ip.wid2 = 7; /* Blue bit width - 1 */
350 break;
351 case IPU_PIX_FMT_BGRA32:
352 case IPU_PIX_FMT_BGR32:
353 case IPU_PIX_FMT_ABGR32:
354 params->ip.bpp = 0;
355 params->ip.pfs = 4;
356 params->ip.npb = 7;
357 params->ip.sat = 2; /* SAT = 32-bit access */
358 params->ip.ofs0 = 8; /* Red bit offset */
359 params->ip.ofs1 = 16; /* Green bit offset */
360 params->ip.ofs2 = 24; /* Blue bit offset */
361 params->ip.ofs3 = 0; /* Alpha bit offset */
362 params->ip.wid0 = 7; /* Red bit width - 1 */
363 params->ip.wid1 = 7; /* Green bit width - 1 */
364 params->ip.wid2 = 7; /* Blue bit width - 1 */
365 params->ip.wid3 = 7; /* Alpha bit width - 1 */
366 break;
367 case IPU_PIX_FMT_RGBA32:
368 case IPU_PIX_FMT_RGB32:
369 params->ip.bpp = 0;
370 params->ip.pfs = 4;
371 params->ip.npb = 7;
372 params->ip.sat = 2; /* SAT = 32-bit access */
373 params->ip.ofs0 = 24; /* Red bit offset */
374 params->ip.ofs1 = 16; /* Green bit offset */
375 params->ip.ofs2 = 8; /* Blue bit offset */
376 params->ip.ofs3 = 0; /* Alpha bit offset */
377 params->ip.wid0 = 7; /* Red bit width - 1 */
378 params->ip.wid1 = 7; /* Green bit width - 1 */
379 params->ip.wid2 = 7; /* Blue bit width - 1 */
380 params->ip.wid3 = 7; /* Alpha bit width - 1 */
381 break;
382 case IPU_PIX_FMT_UYVY:
383 params->ip.bpp = 2;
384 params->ip.pfs = 6;
385 params->ip.npb = 7;
386 params->ip.sat = 2; /* SAT = 32-bit access */
387 break;
388 case IPU_PIX_FMT_YUV420P2:
389 case IPU_PIX_FMT_YUV420P:
390 params->ip.bpp = 3;
391 params->ip.pfs = 3;
392 params->ip.npb = 7;
393 params->ip.sat = 2; /* SAT = 32-bit access */
394 u_offset = stride * height;
395 v_offset = u_offset + u_offset / 4;
396 ipu_ch_param_set_plane_offset(params, u_offset, v_offset);
397 break;
398 case IPU_PIX_FMT_YVU422P:
399 params->ip.bpp = 3;
400 params->ip.pfs = 2;
401 params->ip.npb = 7;
402 params->ip.sat = 2; /* SAT = 32-bit access */
403 v_offset = stride * height;
404 u_offset = v_offset + v_offset / 2;
405 ipu_ch_param_set_plane_offset(params, u_offset, v_offset);
406 break;
407 case IPU_PIX_FMT_YUV422P:
408 params->ip.bpp = 3;
409 params->ip.pfs = 2;
410 params->ip.npb = 7;
411 params->ip.sat = 2; /* SAT = 32-bit access */
412 u_offset = stride * height;
413 v_offset = u_offset + u_offset / 2;
414 ipu_ch_param_set_plane_offset(params, u_offset, v_offset);
415 break;
416 default:
417 dev_err(ipu_data.dev,
418 "mx3 ipu: unimplemented pixel format %d\n", pixel_fmt);
419 break;
420 }
421
422 params->pp.nsb = 1;
423 }
424
425 static void ipu_ch_param_set_buffer(union chan_param_mem *params,
426 dma_addr_t buf0, dma_addr_t buf1)
427 {
428 params->pp.eba0 = buf0;
429 params->pp.eba1 = buf1;
430 }
431
432 static void ipu_ch_param_set_rotation(union chan_param_mem *params,
433 enum ipu_rotate_mode rotate)
434 {
435 params->pp.bam = rotate;
436 }
437
438 static void ipu_write_param_mem(uint32_t addr, uint32_t *data,
439 uint32_t num_words)
440 {
441 for (; num_words > 0; num_words--) {
442 dev_dbg(ipu_data.dev,
443 "write param mem - addr = 0x%08X, data = 0x%08X\n",
444 addr, *data);
445 idmac_write_ipureg(&ipu_data, addr, IPU_IMA_ADDR);
446 idmac_write_ipureg(&ipu_data, *data++, IPU_IMA_DATA);
447 addr++;
448 if ((addr & 0x7) == 5) {
449 addr &= ~0x7; /* set to word 0 */
450 addr += 8; /* increment to next row */
451 }
452 }
453 }
454
455 static int calc_resize_coeffs(uint32_t in_size, uint32_t out_size,
456 uint32_t *resize_coeff,
457 uint32_t *downsize_coeff)
458 {
459 uint32_t temp_size;
460 uint32_t temp_downsize;
461
462 *resize_coeff = 1 << 13;
463 *downsize_coeff = 1 << 13;
464
465 /* Cannot downsize more than 8:1 */
466 if (out_size << 3 < in_size)
467 return -EINVAL;
468
469 /* compute downsizing coefficient */
470 temp_downsize = 0;
471 temp_size = in_size;
472 while (temp_size >= out_size * 2 && temp_downsize < 2) {
473 temp_size >>= 1;
474 temp_downsize++;
475 }
476 *downsize_coeff = temp_downsize;
477
478 /*
479 * compute resizing coefficient using the following formula:
480 * resize_coeff = M*(SI -1)/(SO - 1)
481 * where M = 2^13, SI - input size, SO - output size
482 */
483 *resize_coeff = (8192L * (temp_size - 1)) / (out_size - 1);
484 if (*resize_coeff >= 16384L) {
485 dev_err(ipu_data.dev, "Warning! Overflow on resize coeff.\n");
486 *resize_coeff = 0x3FFF;
487 }
488
489 dev_dbg(ipu_data.dev, "resizing from %u -> %u pixels, "
490 "downsize=%u, resize=%u.%lu (reg=%u)\n", in_size, out_size,
491 *downsize_coeff, *resize_coeff >= 8192L ? 1 : 0,
492 ((*resize_coeff & 0x1FFF) * 10000L) / 8192L, *resize_coeff);
493
494 return 0;
495 }
496
497 static enum ipu_color_space format_to_colorspace(enum pixel_fmt fmt)
498 {
499 switch (fmt) {
500 case IPU_PIX_FMT_RGB565:
501 case IPU_PIX_FMT_BGR24:
502 case IPU_PIX_FMT_RGB24:
503 case IPU_PIX_FMT_BGR32:
504 case IPU_PIX_FMT_RGB32:
505 return IPU_COLORSPACE_RGB;
506 default:
507 return IPU_COLORSPACE_YCBCR;
508 }
509 }
510
511 static int ipu_ic_init_prpenc(struct ipu *ipu,
512 union ipu_channel_param *params, bool src_is_csi)
513 {
514 uint32_t reg, ic_conf;
515 uint32_t downsize_coeff, resize_coeff;
516 enum ipu_color_space in_fmt, out_fmt;
517
518 /* Setup vertical resizing */
519 calc_resize_coeffs(params->video.in_height,
520 params->video.out_height,
521 &resize_coeff, &downsize_coeff);
522 reg = (downsize_coeff << 30) | (resize_coeff << 16);
523
524 /* Setup horizontal resizing */
525 calc_resize_coeffs(params->video.in_width,
526 params->video.out_width,
527 &resize_coeff, &downsize_coeff);
528 reg |= (downsize_coeff << 14) | resize_coeff;
529
530 /* Setup color space conversion */
531 in_fmt = format_to_colorspace(params->video.in_pixel_fmt);
532 out_fmt = format_to_colorspace(params->video.out_pixel_fmt);
533
534 /*
535 * Colourspace conversion unsupported yet - see _init_csc() in
536 * Freescale sources
537 */
538 if (in_fmt != out_fmt) {
539 dev_err(ipu->dev, "Colourspace conversion unsupported!\n");
540 return -EOPNOTSUPP;
541 }
542
543 idmac_write_icreg(ipu, reg, IC_PRP_ENC_RSC);
544
545 ic_conf = idmac_read_icreg(ipu, IC_CONF);
546
547 if (src_is_csi)
548 ic_conf &= ~IC_CONF_RWS_EN;
549 else
550 ic_conf |= IC_CONF_RWS_EN;
551
552 idmac_write_icreg(ipu, ic_conf, IC_CONF);
553
554 return 0;
555 }
556
557 static uint32_t dma_param_addr(uint32_t dma_ch)
558 {
559 /* Channel Parameter Memory */
560 return 0x10000 | (dma_ch << 4);
561 }
562
563 static void ipu_channel_set_priority(struct ipu *ipu, enum ipu_channel channel,
564 bool prio)
565 {
566 u32 reg = idmac_read_icreg(ipu, IDMAC_CHA_PRI);
567
568 if (prio)
569 reg |= 1UL << channel;
570 else
571 reg &= ~(1UL << channel);
572
573 idmac_write_icreg(ipu, reg, IDMAC_CHA_PRI);
574
575 dump_idmac_reg(ipu);
576 }
577
578 static uint32_t ipu_channel_conf_mask(enum ipu_channel channel)
579 {
580 uint32_t mask;
581
582 switch (channel) {
583 case IDMAC_IC_0:
584 case IDMAC_IC_7:
585 mask = IPU_CONF_CSI_EN | IPU_CONF_IC_EN;
586 break;
587 case IDMAC_SDC_0:
588 case IDMAC_SDC_1:
589 mask = IPU_CONF_SDC_EN | IPU_CONF_DI_EN;
590 break;
591 default:
592 mask = 0;
593 break;
594 }
595
596 return mask;
597 }
598
599 /**
600 * ipu_enable_channel() - enable an IPU channel.
601 * @idmac: IPU DMAC context.
602 * @ichan: IDMAC channel.
603 * @return: 0 on success or negative error code on failure.
604 */
605 static int ipu_enable_channel(struct idmac *idmac, struct idmac_channel *ichan)
606 {
607 struct ipu *ipu = to_ipu(idmac);
608 enum ipu_channel channel = ichan->dma_chan.chan_id;
609 uint32_t reg;
610 unsigned long flags;
611
612 spin_lock_irqsave(&ipu->lock, flags);
613
614 /* Reset to buffer 0 */
615 idmac_write_ipureg(ipu, 1UL << channel, IPU_CHA_CUR_BUF);
616 ichan->active_buffer = 0;
617 ichan->status = IPU_CHANNEL_ENABLED;
618
619 switch (channel) {
620 case IDMAC_SDC_0:
621 case IDMAC_SDC_1:
622 case IDMAC_IC_7:
623 ipu_channel_set_priority(ipu, channel, true);
624 default:
625 break;
626 }
627
628 reg = idmac_read_icreg(ipu, IDMAC_CHA_EN);
629
630 idmac_write_icreg(ipu, reg | (1UL << channel), IDMAC_CHA_EN);
631
632 ipu_ic_enable_task(ipu, channel);
633
634 spin_unlock_irqrestore(&ipu->lock, flags);
635 return 0;
636 }
637
638 /**
639 * ipu_init_channel_buffer() - initialize a buffer for logical IPU channel.
640 * @ichan: IDMAC channel.
641 * @pixel_fmt: pixel format of buffer. Pixel format is a FOURCC ASCII code.
642 * @width: width of buffer in pixels.
643 * @height: height of buffer in pixels.
644 * @stride: stride length of buffer in pixels.
645 * @rot_mode: rotation mode of buffer. A rotation setting other than
646 * IPU_ROTATE_VERT_FLIP should only be used for input buffers of
647 * rotation channels.
648 * @phyaddr_0: buffer 0 physical address.
649 * @phyaddr_1: buffer 1 physical address. Setting this to a value other than
650 * NULL enables double buffering mode.
651 * @return: 0 on success or negative error code on failure.
652 */
653 static int ipu_init_channel_buffer(struct idmac_channel *ichan,
654 enum pixel_fmt pixel_fmt,
655 uint16_t width, uint16_t height,
656 uint32_t stride,
657 enum ipu_rotate_mode rot_mode,
658 dma_addr_t phyaddr_0, dma_addr_t phyaddr_1)
659 {
660 enum ipu_channel channel = ichan->dma_chan.chan_id;
661 struct idmac *idmac = to_idmac(ichan->dma_chan.device);
662 struct ipu *ipu = to_ipu(idmac);
663 union chan_param_mem params = {};
664 unsigned long flags;
665 uint32_t reg;
666 uint32_t stride_bytes;
667
668 stride_bytes = stride * bytes_per_pixel(pixel_fmt);
669
670 if (stride_bytes % 4) {
671 dev_err(ipu->dev,
672 "Stride length must be 32-bit aligned, stride = %d, bytes = %d\n",
673 stride, stride_bytes);
674 return -EINVAL;
675 }
676
677 /* IC channel's stride must be a multiple of 8 pixels */
678 if ((channel <= IDMAC_IC_13) && (stride % 8)) {
679 dev_err(ipu->dev, "Stride must be 8 pixel multiple\n");
680 return -EINVAL;
681 }
682
683 /* Build parameter memory data for DMA channel */
684 ipu_ch_param_set_size(&params, pixel_fmt, width, height, stride_bytes);
685 ipu_ch_param_set_buffer(&params, phyaddr_0, phyaddr_1);
686 ipu_ch_param_set_rotation(&params, rot_mode);
687
688 spin_lock_irqsave(&ipu->lock, flags);
689
690 ipu_write_param_mem(dma_param_addr(channel), (uint32_t *)&params, 10);
691
692 reg = idmac_read_ipureg(ipu, IPU_CHA_DB_MODE_SEL);
693
694 if (phyaddr_1)
695 reg |= 1UL << channel;
696 else
697 reg &= ~(1UL << channel);
698
699 idmac_write_ipureg(ipu, reg, IPU_CHA_DB_MODE_SEL);
700
701 ichan->status = IPU_CHANNEL_READY;
702
703 spin_unlock_irqrestore(&ipu->lock, flags);
704
705 return 0;
706 }
707
708 /**
709 * ipu_select_buffer() - mark a channel's buffer as ready.
710 * @channel: channel ID.
711 * @buffer_n: buffer number to mark ready.
712 */
713 static void ipu_select_buffer(enum ipu_channel channel, int buffer_n)
714 {
715 /* No locking - this is a write-one-to-set register, cleared by IPU */
716 if (buffer_n == 0)
717 /* Mark buffer 0 as ready. */
718 idmac_write_ipureg(&ipu_data, 1UL << channel, IPU_CHA_BUF0_RDY);
719 else
720 /* Mark buffer 1 as ready. */
721 idmac_write_ipureg(&ipu_data, 1UL << channel, IPU_CHA_BUF1_RDY);
722 }
723
724 /**
725 * ipu_update_channel_buffer() - update physical address of a channel buffer.
726 * @ichan: IDMAC channel.
727 * @buffer_n: buffer number to update.
728 * 0 or 1 are the only valid values.
729 * @phyaddr: buffer physical address.
730 */
731 /* Called under spin_lock(_irqsave)(&ichan->lock) */
732 static void ipu_update_channel_buffer(struct idmac_channel *ichan,
733 int buffer_n, dma_addr_t phyaddr)
734 {
735 enum ipu_channel channel = ichan->dma_chan.chan_id;
736 uint32_t reg;
737 unsigned long flags;
738
739 spin_lock_irqsave(&ipu_data.lock, flags);
740
741 if (buffer_n == 0) {
742 reg = idmac_read_ipureg(&ipu_data, IPU_CHA_BUF0_RDY);
743 if (reg & (1UL << channel)) {
744 ipu_ic_disable_task(&ipu_data, channel);
745 ichan->status = IPU_CHANNEL_READY;
746 }
747
748 /* 44.3.3.1.9 - Row Number 1 (WORD1, offset 0) */
749 idmac_write_ipureg(&ipu_data, dma_param_addr(channel) +
750 0x0008UL, IPU_IMA_ADDR);
751 idmac_write_ipureg(&ipu_data, phyaddr, IPU_IMA_DATA);
752 } else {
753 reg = idmac_read_ipureg(&ipu_data, IPU_CHA_BUF1_RDY);
754 if (reg & (1UL << channel)) {
755 ipu_ic_disable_task(&ipu_data, channel);
756 ichan->status = IPU_CHANNEL_READY;
757 }
758
759 /* Check if double-buffering is already enabled */
760 reg = idmac_read_ipureg(&ipu_data, IPU_CHA_DB_MODE_SEL);
761
762 if (!(reg & (1UL << channel)))
763 idmac_write_ipureg(&ipu_data, reg | (1UL << channel),
764 IPU_CHA_DB_MODE_SEL);
765
766 /* 44.3.3.1.9 - Row Number 1 (WORD1, offset 1) */
767 idmac_write_ipureg(&ipu_data, dma_param_addr(channel) +
768 0x0009UL, IPU_IMA_ADDR);
769 idmac_write_ipureg(&ipu_data, phyaddr, IPU_IMA_DATA);
770 }
771
772 spin_unlock_irqrestore(&ipu_data.lock, flags);
773 }
774
775 /* Called under spin_lock_irqsave(&ichan->lock) */
776 static int ipu_submit_buffer(struct idmac_channel *ichan,
777 struct idmac_tx_desc *desc, struct scatterlist *sg, int buf_idx)
778 {
779 unsigned int chan_id = ichan->dma_chan.chan_id;
780 struct device *dev = &ichan->dma_chan.dev->device;
781
782 if (async_tx_test_ack(&desc->txd))
783 return -EINTR;
784
785 /*
786 * On first invocation this shouldn't be necessary, the call to
787 * ipu_init_channel_buffer() above will set addresses for us, so we
788 * could make it conditional on status >= IPU_CHANNEL_ENABLED, but
789 * doing it again shouldn't hurt either.
790 */
791 ipu_update_channel_buffer(ichan, buf_idx, sg_dma_address(sg));
792
793 ipu_select_buffer(chan_id, buf_idx);
794 dev_dbg(dev, "Updated sg %p on channel 0x%x buffer %d\n",
795 sg, chan_id, buf_idx);
796
797 return 0;
798 }
799
800 /* Called under spin_lock_irqsave(&ichan->lock) */
801 static int ipu_submit_channel_buffers(struct idmac_channel *ichan,
802 struct idmac_tx_desc *desc)
803 {
804 struct scatterlist *sg;
805 int i, ret = 0;
806
807 for (i = 0, sg = desc->sg; i < 2 && sg; i++) {
808 if (!ichan->sg[i]) {
809 ichan->sg[i] = sg;
810
811 ret = ipu_submit_buffer(ichan, desc, sg, i);
812 if (ret < 0)
813 return ret;
814
815 sg = sg_next(sg);
816 }
817 }
818
819 return ret;
820 }
821
822 static dma_cookie_t idmac_tx_submit(struct dma_async_tx_descriptor *tx)
823 {
824 struct idmac_tx_desc *desc = to_tx_desc(tx);
825 struct idmac_channel *ichan = to_idmac_chan(tx->chan);
826 struct idmac *idmac = to_idmac(tx->chan->device);
827 struct ipu *ipu = to_ipu(idmac);
828 struct device *dev = &ichan->dma_chan.dev->device;
829 dma_cookie_t cookie;
830 unsigned long flags;
831 int ret;
832
833 /* Sanity check */
834 if (!list_empty(&desc->list)) {
835 /* The descriptor doesn't belong to client */
836 dev_err(dev, "Descriptor %p not prepared!\n", tx);
837 return -EBUSY;
838 }
839
840 mutex_lock(&ichan->chan_mutex);
841
842 async_tx_clear_ack(tx);
843
844 if (ichan->status < IPU_CHANNEL_READY) {
845 struct idmac_video_param *video = &ichan->params.video;
846 /*
847 * Initial buffer assignment - the first two sg-entries from
848 * the descriptor will end up in the IDMAC buffers
849 */
850 dma_addr_t dma_1 = sg_is_last(desc->sg) ? 0 :
851 sg_dma_address(&desc->sg[1]);
852
853 WARN_ON(ichan->sg[0] || ichan->sg[1]);
854
855 cookie = ipu_init_channel_buffer(ichan,
856 video->out_pixel_fmt,
857 video->out_width,
858 video->out_height,
859 video->out_stride,
860 IPU_ROTATE_NONE,
861 sg_dma_address(&desc->sg[0]),
862 dma_1);
863 if (cookie < 0)
864 goto out;
865 }
866
867 dev_dbg(dev, "Submitting sg %p\n", &desc->sg[0]);
868
869 cookie = dma_cookie_assign(tx);
870
871 /* ipu->lock can be taken under ichan->lock, but not v.v. */
872 spin_lock_irqsave(&ichan->lock, flags);
873
874 list_add_tail(&desc->list, &ichan->queue);
875 /* submit_buffers() atomically verifies and fills empty sg slots */
876 ret = ipu_submit_channel_buffers(ichan, desc);
877
878 spin_unlock_irqrestore(&ichan->lock, flags);
879
880 if (ret < 0) {
881 cookie = ret;
882 goto dequeue;
883 }
884
885 if (ichan->status < IPU_CHANNEL_ENABLED) {
886 ret = ipu_enable_channel(idmac, ichan);
887 if (ret < 0) {
888 cookie = ret;
889 goto dequeue;
890 }
891 }
892
893 dump_idmac_reg(ipu);
894
895 dequeue:
896 if (cookie < 0) {
897 spin_lock_irqsave(&ichan->lock, flags);
898 list_del_init(&desc->list);
899 spin_unlock_irqrestore(&ichan->lock, flags);
900 tx->cookie = cookie;
901 ichan->dma_chan.cookie = cookie;
902 }
903
904 out:
905 mutex_unlock(&ichan->chan_mutex);
906
907 return cookie;
908 }
909
910 /* Called with ichan->chan_mutex held */
911 static int idmac_desc_alloc(struct idmac_channel *ichan, int n)
912 {
913 struct idmac_tx_desc *desc = vmalloc(n * sizeof(struct idmac_tx_desc));
914 struct idmac *idmac = to_idmac(ichan->dma_chan.device);
915
916 if (!desc)
917 return -ENOMEM;
918
919 /* No interrupts, just disable the tasklet for a moment */
920 tasklet_disable(&to_ipu(idmac)->tasklet);
921
922 ichan->n_tx_desc = n;
923 ichan->desc = desc;
924 INIT_LIST_HEAD(&ichan->queue);
925 INIT_LIST_HEAD(&ichan->free_list);
926
927 while (n--) {
928 struct dma_async_tx_descriptor *txd = &desc->txd;
929
930 memset(txd, 0, sizeof(*txd));
931 dma_async_tx_descriptor_init(txd, &ichan->dma_chan);
932 txd->tx_submit = idmac_tx_submit;
933
934 list_add(&desc->list, &ichan->free_list);
935
936 desc++;
937 }
938
939 tasklet_enable(&to_ipu(idmac)->tasklet);
940
941 return 0;
942 }
943
944 /**
945 * ipu_init_channel() - initialize an IPU channel.
946 * @idmac: IPU DMAC context.
947 * @ichan: pointer to the channel object.
948 * @return 0 on success or negative error code on failure.
949 */
950 static int ipu_init_channel(struct idmac *idmac, struct idmac_channel *ichan)
951 {
952 union ipu_channel_param *params = &ichan->params;
953 uint32_t ipu_conf;
954 enum ipu_channel channel = ichan->dma_chan.chan_id;
955 unsigned long flags;
956 uint32_t reg;
957 struct ipu *ipu = to_ipu(idmac);
958 int ret = 0, n_desc = 0;
959
960 dev_dbg(ipu->dev, "init channel = %d\n", channel);
961
962 if (channel != IDMAC_SDC_0 && channel != IDMAC_SDC_1 &&
963 channel != IDMAC_IC_7)
964 return -EINVAL;
965
966 spin_lock_irqsave(&ipu->lock, flags);
967
968 switch (channel) {
969 case IDMAC_IC_7:
970 n_desc = 16;
971 reg = idmac_read_icreg(ipu, IC_CONF);
972 idmac_write_icreg(ipu, reg & ~IC_CONF_CSI_MEM_WR_EN, IC_CONF);
973 break;
974 case IDMAC_IC_0:
975 n_desc = 16;
976 reg = idmac_read_ipureg(ipu, IPU_FS_PROC_FLOW);
977 idmac_write_ipureg(ipu, reg & ~FS_ENC_IN_VALID, IPU_FS_PROC_FLOW);
978 ret = ipu_ic_init_prpenc(ipu, params, true);
979 break;
980 case IDMAC_SDC_0:
981 case IDMAC_SDC_1:
982 n_desc = 4;
983 default:
984 break;
985 }
986
987 ipu->channel_init_mask |= 1L << channel;
988
989 /* Enable IPU sub module */
990 ipu_conf = idmac_read_ipureg(ipu, IPU_CONF) |
991 ipu_channel_conf_mask(channel);
992 idmac_write_ipureg(ipu, ipu_conf, IPU_CONF);
993
994 spin_unlock_irqrestore(&ipu->lock, flags);
995
996 if (n_desc && !ichan->desc)
997 ret = idmac_desc_alloc(ichan, n_desc);
998
999 dump_idmac_reg(ipu);
1000
1001 return ret;
1002 }
1003
1004 /**
1005 * ipu_uninit_channel() - uninitialize an IPU channel.
1006 * @idmac: IPU DMAC context.
1007 * @ichan: pointer to the channel object.
1008 */
1009 static void ipu_uninit_channel(struct idmac *idmac, struct idmac_channel *ichan)
1010 {
1011 enum ipu_channel channel = ichan->dma_chan.chan_id;
1012 unsigned long flags;
1013 uint32_t reg;
1014 unsigned long chan_mask = 1UL << channel;
1015 uint32_t ipu_conf;
1016 struct ipu *ipu = to_ipu(idmac);
1017
1018 spin_lock_irqsave(&ipu->lock, flags);
1019
1020 if (!(ipu->channel_init_mask & chan_mask)) {
1021 dev_err(ipu->dev, "Channel already uninitialized %d\n",
1022 channel);
1023 spin_unlock_irqrestore(&ipu->lock, flags);
1024 return;
1025 }
1026
1027 /* Reset the double buffer */
1028 reg = idmac_read_ipureg(ipu, IPU_CHA_DB_MODE_SEL);
1029 idmac_write_ipureg(ipu, reg & ~chan_mask, IPU_CHA_DB_MODE_SEL);
1030
1031 ichan->sec_chan_en = false;
1032
1033 switch (channel) {
1034 case IDMAC_IC_7:
1035 reg = idmac_read_icreg(ipu, IC_CONF);
1036 idmac_write_icreg(ipu, reg & ~(IC_CONF_RWS_EN | IC_CONF_PRPENC_EN),
1037 IC_CONF);
1038 break;
1039 case IDMAC_IC_0:
1040 reg = idmac_read_icreg(ipu, IC_CONF);
1041 idmac_write_icreg(ipu, reg & ~(IC_CONF_PRPENC_EN | IC_CONF_PRPENC_CSC1),
1042 IC_CONF);
1043 break;
1044 case IDMAC_SDC_0:
1045 case IDMAC_SDC_1:
1046 default:
1047 break;
1048 }
1049
1050 ipu->channel_init_mask &= ~(1L << channel);
1051
1052 ipu_conf = idmac_read_ipureg(ipu, IPU_CONF) &
1053 ~ipu_channel_conf_mask(channel);
1054 idmac_write_ipureg(ipu, ipu_conf, IPU_CONF);
1055
1056 spin_unlock_irqrestore(&ipu->lock, flags);
1057
1058 ichan->n_tx_desc = 0;
1059 vfree(ichan->desc);
1060 ichan->desc = NULL;
1061 }
1062
1063 /**
1064 * ipu_disable_channel() - disable an IPU channel.
1065 * @idmac: IPU DMAC context.
1066 * @ichan: channel object pointer.
1067 * @wait_for_stop: flag to set whether to wait for channel end of frame or
1068 * return immediately.
1069 * @return: 0 on success or negative error code on failure.
1070 */
1071 static int ipu_disable_channel(struct idmac *idmac, struct idmac_channel *ichan,
1072 bool wait_for_stop)
1073 {
1074 enum ipu_channel channel = ichan->dma_chan.chan_id;
1075 struct ipu *ipu = to_ipu(idmac);
1076 uint32_t reg;
1077 unsigned long flags;
1078 unsigned long chan_mask = 1UL << channel;
1079 unsigned int timeout;
1080
1081 if (wait_for_stop && channel != IDMAC_SDC_1 && channel != IDMAC_SDC_0) {
1082 timeout = 40;
1083 /* This waiting always fails. Related to spurious irq problem */
1084 while ((idmac_read_icreg(ipu, IDMAC_CHA_BUSY) & chan_mask) ||
1085 (ipu_channel_status(ipu, channel) == TASK_STAT_ACTIVE)) {
1086 timeout--;
1087 msleep(10);
1088
1089 if (!timeout) {
1090 dev_dbg(ipu->dev,
1091 "Warning: timeout waiting for channel %u to "
1092 "stop: buf0_rdy = 0x%08X, buf1_rdy = 0x%08X, "
1093 "busy = 0x%08X, tstat = 0x%08X\n", channel,
1094 idmac_read_ipureg(ipu, IPU_CHA_BUF0_RDY),
1095 idmac_read_ipureg(ipu, IPU_CHA_BUF1_RDY),
1096 idmac_read_icreg(ipu, IDMAC_CHA_BUSY),
1097 idmac_read_ipureg(ipu, IPU_TASKS_STAT));
1098 break;
1099 }
1100 }
1101 dev_dbg(ipu->dev, "timeout = %d * 10ms\n", 40 - timeout);
1102 }
1103 /* SDC BG and FG must be disabled before DMA is disabled */
1104 if (wait_for_stop && (channel == IDMAC_SDC_0 ||
1105 channel == IDMAC_SDC_1)) {
1106 for (timeout = 5;
1107 timeout && !ipu_irq_status(ichan->eof_irq); timeout--)
1108 msleep(5);
1109 }
1110
1111 spin_lock_irqsave(&ipu->lock, flags);
1112
1113 /* Disable IC task */
1114 ipu_ic_disable_task(ipu, channel);
1115
1116 /* Disable DMA channel(s) */
1117 reg = idmac_read_icreg(ipu, IDMAC_CHA_EN);
1118 idmac_write_icreg(ipu, reg & ~chan_mask, IDMAC_CHA_EN);
1119
1120 spin_unlock_irqrestore(&ipu->lock, flags);
1121
1122 return 0;
1123 }
1124
1125 static struct scatterlist *idmac_sg_next(struct idmac_channel *ichan,
1126 struct idmac_tx_desc **desc, struct scatterlist *sg)
1127 {
1128 struct scatterlist *sgnew = sg ? sg_next(sg) : NULL;
1129
1130 if (sgnew)
1131 /* next sg-element in this list */
1132 return sgnew;
1133
1134 if ((*desc)->list.next == &ichan->queue)
1135 /* No more descriptors on the queue */
1136 return NULL;
1137
1138 /* Fetch next descriptor */
1139 *desc = list_entry((*desc)->list.next, struct idmac_tx_desc, list);
1140 return (*desc)->sg;
1141 }
1142
1143 /*
1144 * We have several possibilities here:
1145 * current BUF next BUF
1146 *
1147 * not last sg next not last sg
1148 * not last sg next last sg
1149 * last sg first sg from next descriptor
1150 * last sg NULL
1151 *
1152 * Besides, the descriptor queue might be empty or not. We process all these
1153 * cases carefully.
1154 */
1155 static irqreturn_t idmac_interrupt(int irq, void *dev_id)
1156 {
1157 struct idmac_channel *ichan = dev_id;
1158 struct device *dev = &ichan->dma_chan.dev->device;
1159 unsigned int chan_id = ichan->dma_chan.chan_id;
1160 struct scatterlist **sg, *sgnext, *sgnew = NULL;
1161 /* Next transfer descriptor */
1162 struct idmac_tx_desc *desc, *descnew;
1163 bool done = false;
1164 u32 ready0, ready1, curbuf, err;
1165 unsigned long flags;
1166 struct dmaengine_desc_callback cb;
1167
1168 /* IDMAC has cleared the respective BUFx_RDY bit, we manage the buffer */
1169
1170 dev_dbg(dev, "IDMAC irq %d, buf %d\n", irq, ichan->active_buffer);
1171
1172 spin_lock_irqsave(&ipu_data.lock, flags);
1173
1174 ready0 = idmac_read_ipureg(&ipu_data, IPU_CHA_BUF0_RDY);
1175 ready1 = idmac_read_ipureg(&ipu_data, IPU_CHA_BUF1_RDY);
1176 curbuf = idmac_read_ipureg(&ipu_data, IPU_CHA_CUR_BUF);
1177 err = idmac_read_ipureg(&ipu_data, IPU_INT_STAT_4);
1178
1179 if (err & (1 << chan_id)) {
1180 idmac_write_ipureg(&ipu_data, 1 << chan_id, IPU_INT_STAT_4);
1181 spin_unlock_irqrestore(&ipu_data.lock, flags);
1182 /*
1183 * Doing this
1184 * ichan->sg[0] = ichan->sg[1] = NULL;
1185 * you can force channel re-enable on the next tx_submit(), but
1186 * this is dirty - think about descriptors with multiple
1187 * sg elements.
1188 */
1189 dev_warn(dev, "NFB4EOF on channel %d, ready %x, %x, cur %x\n",
1190 chan_id, ready0, ready1, curbuf);
1191 return IRQ_HANDLED;
1192 }
1193 spin_unlock_irqrestore(&ipu_data.lock, flags);
1194
1195 /* Other interrupts do not interfere with this channel */
1196 spin_lock(&ichan->lock);
1197 if (unlikely((ichan->active_buffer && (ready1 >> chan_id) & 1) ||
1198 (!ichan->active_buffer && (ready0 >> chan_id) & 1)
1199 )) {
1200 spin_unlock(&ichan->lock);
1201 dev_dbg(dev,
1202 "IRQ with active buffer still ready on channel %x, "
1203 "active %d, ready %x, %x!\n", chan_id,
1204 ichan->active_buffer, ready0, ready1);
1205 return IRQ_NONE;
1206 }
1207
1208 if (unlikely(list_empty(&ichan->queue))) {
1209 ichan->sg[ichan->active_buffer] = NULL;
1210 spin_unlock(&ichan->lock);
1211 dev_err(dev,
1212 "IRQ without queued buffers on channel %x, active %d, "
1213 "ready %x, %x!\n", chan_id,
1214 ichan->active_buffer, ready0, ready1);
1215 return IRQ_NONE;
1216 }
1217
1218 /*
1219 * active_buffer is a software flag, it shows which buffer we are
1220 * currently expecting back from the hardware, IDMAC should be
1221 * processing the other buffer already
1222 */
1223 sg = &ichan->sg[ichan->active_buffer];
1224 sgnext = ichan->sg[!ichan->active_buffer];
1225
1226 if (!*sg) {
1227 spin_unlock(&ichan->lock);
1228 return IRQ_HANDLED;
1229 }
1230
1231 desc = list_entry(ichan->queue.next, struct idmac_tx_desc, list);
1232 descnew = desc;
1233
1234 dev_dbg(dev, "IDMAC irq %d, dma %#llx, next dma %#llx, current %d, curbuf %#x\n",
1235 irq, (u64)sg_dma_address(*sg),
1236 sgnext ? (u64)sg_dma_address(sgnext) : 0,
1237 ichan->active_buffer, curbuf);
1238
1239 /* Find the descriptor of sgnext */
1240 sgnew = idmac_sg_next(ichan, &descnew, *sg);
1241 if (sgnext != sgnew)
1242 dev_err(dev, "Submitted buffer %p, next buffer %p\n", sgnext, sgnew);
1243
1244 /*
1245 * if sgnext == NULL sg must be the last element in a scatterlist and
1246 * queue must be empty
1247 */
1248 if (unlikely(!sgnext)) {
1249 if (!WARN_ON(sg_next(*sg)))
1250 dev_dbg(dev, "Underrun on channel %x\n", chan_id);
1251 ichan->sg[!ichan->active_buffer] = sgnew;
1252
1253 if (unlikely(sgnew)) {
1254 ipu_submit_buffer(ichan, descnew, sgnew, !ichan->active_buffer);
1255 } else {
1256 spin_lock_irqsave(&ipu_data.lock, flags);
1257 ipu_ic_disable_task(&ipu_data, chan_id);
1258 spin_unlock_irqrestore(&ipu_data.lock, flags);
1259 ichan->status = IPU_CHANNEL_READY;
1260 /* Continue to check for complete descriptor */
1261 }
1262 }
1263
1264 /* Calculate and submit the next sg element */
1265 sgnew = idmac_sg_next(ichan, &descnew, sgnew);
1266
1267 if (unlikely(!sg_next(*sg)) || !sgnext) {
1268 /*
1269 * Last element in scatterlist done, remove from the queue,
1270 * _init for debugging
1271 */
1272 list_del_init(&desc->list);
1273 done = true;
1274 }
1275
1276 *sg = sgnew;
1277
1278 if (likely(sgnew) &&
1279 ipu_submit_buffer(ichan, descnew, sgnew, ichan->active_buffer) < 0) {
1280 dmaengine_desc_get_callback(&descnew->txd, &cb);
1281
1282 list_del_init(&descnew->list);
1283 spin_unlock(&ichan->lock);
1284
1285 dmaengine_desc_callback_invoke(&cb, NULL);
1286 spin_lock(&ichan->lock);
1287 }
1288
1289 /* Flip the active buffer - even if update above failed */
1290 ichan->active_buffer = !ichan->active_buffer;
1291 if (done)
1292 dma_cookie_complete(&desc->txd);
1293
1294 dmaengine_desc_get_callback(&desc->txd, &cb);
1295
1296 spin_unlock(&ichan->lock);
1297
1298 if (done && (desc->txd.flags & DMA_PREP_INTERRUPT))
1299 dmaengine_desc_callback_invoke(&cb, NULL);
1300
1301 return IRQ_HANDLED;
1302 }
1303
1304 static void ipu_gc_tasklet(unsigned long arg)
1305 {
1306 struct ipu *ipu = (struct ipu *)arg;
1307 int i;
1308
1309 for (i = 0; i < IPU_CHANNELS_NUM; i++) {
1310 struct idmac_channel *ichan = ipu->channel + i;
1311 struct idmac_tx_desc *desc;
1312 unsigned long flags;
1313 struct scatterlist *sg;
1314 int j, k;
1315
1316 for (j = 0; j < ichan->n_tx_desc; j++) {
1317 desc = ichan->desc + j;
1318 spin_lock_irqsave(&ichan->lock, flags);
1319 if (async_tx_test_ack(&desc->txd)) {
1320 list_move(&desc->list, &ichan->free_list);
1321 for_each_sg(desc->sg, sg, desc->sg_len, k) {
1322 if (ichan->sg[0] == sg)
1323 ichan->sg[0] = NULL;
1324 else if (ichan->sg[1] == sg)
1325 ichan->sg[1] = NULL;
1326 }
1327 async_tx_clear_ack(&desc->txd);
1328 }
1329 spin_unlock_irqrestore(&ichan->lock, flags);
1330 }
1331 }
1332 }
1333
1334 /* Allocate and initialise a transfer descriptor. */
1335 static struct dma_async_tx_descriptor *idmac_prep_slave_sg(struct dma_chan *chan,
1336 struct scatterlist *sgl, unsigned int sg_len,
1337 enum dma_transfer_direction direction, unsigned long tx_flags,
1338 void *context)
1339 {
1340 struct idmac_channel *ichan = to_idmac_chan(chan);
1341 struct idmac_tx_desc *desc = NULL;
1342 struct dma_async_tx_descriptor *txd = NULL;
1343 unsigned long flags;
1344
1345 /* We only can handle these three channels so far */
1346 if (chan->chan_id != IDMAC_SDC_0 && chan->chan_id != IDMAC_SDC_1 &&
1347 chan->chan_id != IDMAC_IC_7)
1348 return NULL;
1349
1350 if (!is_slave_direction(direction)) {
1351 dev_err(chan->device->dev, "Invalid DMA direction %d!\n", direction);
1352 return NULL;
1353 }
1354
1355 mutex_lock(&ichan->chan_mutex);
1356
1357 spin_lock_irqsave(&ichan->lock, flags);
1358 if (!list_empty(&ichan->free_list)) {
1359 desc = list_entry(ichan->free_list.next,
1360 struct idmac_tx_desc, list);
1361
1362 list_del_init(&desc->list);
1363
1364 desc->sg_len = sg_len;
1365 desc->sg = sgl;
1366 txd = &desc->txd;
1367 txd->flags = tx_flags;
1368 }
1369 spin_unlock_irqrestore(&ichan->lock, flags);
1370
1371 mutex_unlock(&ichan->chan_mutex);
1372
1373 tasklet_schedule(&to_ipu(to_idmac(chan->device))->tasklet);
1374
1375 return txd;
1376 }
1377
1378 /* Re-select the current buffer and re-activate the channel */
1379 static void idmac_issue_pending(struct dma_chan *chan)
1380 {
1381 struct idmac_channel *ichan = to_idmac_chan(chan);
1382 struct idmac *idmac = to_idmac(chan->device);
1383 struct ipu *ipu = to_ipu(idmac);
1384 unsigned long flags;
1385
1386 /* This is not always needed, but doesn't hurt either */
1387 spin_lock_irqsave(&ipu->lock, flags);
1388 ipu_select_buffer(chan->chan_id, ichan->active_buffer);
1389 spin_unlock_irqrestore(&ipu->lock, flags);
1390
1391 /*
1392 * Might need to perform some parts of initialisation from
1393 * ipu_enable_channel(), but not all, we do not want to reset to buffer
1394 * 0, don't need to set priority again either, but re-enabling the task
1395 * and the channel might be a good idea.
1396 */
1397 }
1398
1399 static int idmac_pause(struct dma_chan *chan)
1400 {
1401 struct idmac_channel *ichan = to_idmac_chan(chan);
1402 struct idmac *idmac = to_idmac(chan->device);
1403 struct ipu *ipu = to_ipu(idmac);
1404 struct list_head *list, *tmp;
1405 unsigned long flags;
1406
1407 mutex_lock(&ichan->chan_mutex);
1408
1409 spin_lock_irqsave(&ipu->lock, flags);
1410 ipu_ic_disable_task(ipu, chan->chan_id);
1411
1412 /* Return all descriptors into "prepared" state */
1413 list_for_each_safe(list, tmp, &ichan->queue)
1414 list_del_init(list);
1415
1416 ichan->sg[0] = NULL;
1417 ichan->sg[1] = NULL;
1418
1419 spin_unlock_irqrestore(&ipu->lock, flags);
1420
1421 ichan->status = IPU_CHANNEL_INITIALIZED;
1422
1423 mutex_unlock(&ichan->chan_mutex);
1424
1425 return 0;
1426 }
1427
1428 static int __idmac_terminate_all(struct dma_chan *chan)
1429 {
1430 struct idmac_channel *ichan = to_idmac_chan(chan);
1431 struct idmac *idmac = to_idmac(chan->device);
1432 struct ipu *ipu = to_ipu(idmac);
1433 unsigned long flags;
1434 int i;
1435
1436 ipu_disable_channel(idmac, ichan,
1437 ichan->status >= IPU_CHANNEL_ENABLED);
1438
1439 tasklet_disable(&ipu->tasklet);
1440
1441 /* ichan->queue is modified in ISR, have to spinlock */
1442 spin_lock_irqsave(&ichan->lock, flags);
1443 list_splice_init(&ichan->queue, &ichan->free_list);
1444
1445 if (ichan->desc)
1446 for (i = 0; i < ichan->n_tx_desc; i++) {
1447 struct idmac_tx_desc *desc = ichan->desc + i;
1448 if (list_empty(&desc->list))
1449 /* Descriptor was prepared, but not submitted */
1450 list_add(&desc->list, &ichan->free_list);
1451
1452 async_tx_clear_ack(&desc->txd);
1453 }
1454
1455 ichan->sg[0] = NULL;
1456 ichan->sg[1] = NULL;
1457 spin_unlock_irqrestore(&ichan->lock, flags);
1458
1459 tasklet_enable(&ipu->tasklet);
1460
1461 ichan->status = IPU_CHANNEL_INITIALIZED;
1462
1463 return 0;
1464 }
1465
1466 static int idmac_terminate_all(struct dma_chan *chan)
1467 {
1468 struct idmac_channel *ichan = to_idmac_chan(chan);
1469 int ret;
1470
1471 mutex_lock(&ichan->chan_mutex);
1472
1473 ret = __idmac_terminate_all(chan);
1474
1475 mutex_unlock(&ichan->chan_mutex);
1476
1477 return ret;
1478 }
1479
1480 #ifdef DEBUG
1481 static irqreturn_t ic_sof_irq(int irq, void *dev_id)
1482 {
1483 struct idmac_channel *ichan = dev_id;
1484 printk(KERN_DEBUG "Got SOF IRQ %d on Channel %d\n",
1485 irq, ichan->dma_chan.chan_id);
1486 disable_irq_nosync(irq);
1487 return IRQ_HANDLED;
1488 }
1489
1490 static irqreturn_t ic_eof_irq(int irq, void *dev_id)
1491 {
1492 struct idmac_channel *ichan = dev_id;
1493 printk(KERN_DEBUG "Got EOF IRQ %d on Channel %d\n",
1494 irq, ichan->dma_chan.chan_id);
1495 disable_irq_nosync(irq);
1496 return IRQ_HANDLED;
1497 }
1498
1499 static int ic_sof = -EINVAL, ic_eof = -EINVAL;
1500 #endif
1501
1502 static int idmac_alloc_chan_resources(struct dma_chan *chan)
1503 {
1504 struct idmac_channel *ichan = to_idmac_chan(chan);
1505 struct idmac *idmac = to_idmac(chan->device);
1506 int ret;
1507
1508 /* dmaengine.c now guarantees to only offer free channels */
1509 BUG_ON(chan->client_count > 1);
1510 WARN_ON(ichan->status != IPU_CHANNEL_FREE);
1511
1512 dma_cookie_init(chan);
1513
1514 ret = ipu_irq_map(chan->chan_id);
1515 if (ret < 0)
1516 goto eimap;
1517
1518 ichan->eof_irq = ret;
1519
1520 /*
1521 * Important to first disable the channel, because maybe someone
1522 * used it before us, e.g., the bootloader
1523 */
1524 ipu_disable_channel(idmac, ichan, true);
1525
1526 ret = ipu_init_channel(idmac, ichan);
1527 if (ret < 0)
1528 goto eichan;
1529
1530 ret = request_irq(ichan->eof_irq, idmac_interrupt, 0,
1531 ichan->eof_name, ichan);
1532 if (ret < 0)
1533 goto erirq;
1534
1535 #ifdef DEBUG
1536 if (chan->chan_id == IDMAC_IC_7) {
1537 ic_sof = ipu_irq_map(69);
1538 if (ic_sof > 0) {
1539 ret = request_irq(ic_sof, ic_sof_irq, 0, "IC SOF", ichan);
1540 if (ret)
1541 dev_err(&chan->dev->device, "request irq failed for IC SOF");
1542 }
1543 ic_eof = ipu_irq_map(70);
1544 if (ic_eof > 0) {
1545 ret = request_irq(ic_eof, ic_eof_irq, 0, "IC EOF", ichan);
1546 if (ret)
1547 dev_err(&chan->dev->device, "request irq failed for IC EOF");
1548 }
1549 }
1550 #endif
1551
1552 ichan->status = IPU_CHANNEL_INITIALIZED;
1553
1554 dev_dbg(&chan->dev->device, "Found channel 0x%x, irq %d\n",
1555 chan->chan_id, ichan->eof_irq);
1556
1557 return ret;
1558
1559 erirq:
1560 ipu_uninit_channel(idmac, ichan);
1561 eichan:
1562 ipu_irq_unmap(chan->chan_id);
1563 eimap:
1564 return ret;
1565 }
1566
1567 static void idmac_free_chan_resources(struct dma_chan *chan)
1568 {
1569 struct idmac_channel *ichan = to_idmac_chan(chan);
1570 struct idmac *idmac = to_idmac(chan->device);
1571
1572 mutex_lock(&ichan->chan_mutex);
1573
1574 __idmac_terminate_all(chan);
1575
1576 if (ichan->status > IPU_CHANNEL_FREE) {
1577 #ifdef DEBUG
1578 if (chan->chan_id == IDMAC_IC_7) {
1579 if (ic_sof > 0) {
1580 free_irq(ic_sof, ichan);
1581 ipu_irq_unmap(69);
1582 ic_sof = -EINVAL;
1583 }
1584 if (ic_eof > 0) {
1585 free_irq(ic_eof, ichan);
1586 ipu_irq_unmap(70);
1587 ic_eof = -EINVAL;
1588 }
1589 }
1590 #endif
1591 free_irq(ichan->eof_irq, ichan);
1592 ipu_irq_unmap(chan->chan_id);
1593 }
1594
1595 ichan->status = IPU_CHANNEL_FREE;
1596
1597 ipu_uninit_channel(idmac, ichan);
1598
1599 mutex_unlock(&ichan->chan_mutex);
1600
1601 tasklet_schedule(&to_ipu(idmac)->tasklet);
1602 }
1603
1604 static enum dma_status idmac_tx_status(struct dma_chan *chan,
1605 dma_cookie_t cookie, struct dma_tx_state *txstate)
1606 {
1607 return dma_cookie_status(chan, cookie, txstate);
1608 }
1609
1610 static int __init ipu_idmac_init(struct ipu *ipu)
1611 {
1612 struct idmac *idmac = &ipu->idmac;
1613 struct dma_device *dma = &idmac->dma;
1614 int i;
1615
1616 dma_cap_set(DMA_SLAVE, dma->cap_mask);
1617 dma_cap_set(DMA_PRIVATE, dma->cap_mask);
1618
1619 /* Compulsory common fields */
1620 dma->dev = ipu->dev;
1621 dma->device_alloc_chan_resources = idmac_alloc_chan_resources;
1622 dma->device_free_chan_resources = idmac_free_chan_resources;
1623 dma->device_tx_status = idmac_tx_status;
1624 dma->device_issue_pending = idmac_issue_pending;
1625
1626 /* Compulsory for DMA_SLAVE fields */
1627 dma->device_prep_slave_sg = idmac_prep_slave_sg;
1628 dma->device_pause = idmac_pause;
1629 dma->device_terminate_all = idmac_terminate_all;
1630
1631 INIT_LIST_HEAD(&dma->channels);
1632 for (i = 0; i < IPU_CHANNELS_NUM; i++) {
1633 struct idmac_channel *ichan = ipu->channel + i;
1634 struct dma_chan *dma_chan = &ichan->dma_chan;
1635
1636 spin_lock_init(&ichan->lock);
1637 mutex_init(&ichan->chan_mutex);
1638
1639 ichan->status = IPU_CHANNEL_FREE;
1640 ichan->sec_chan_en = false;
1641 snprintf(ichan->eof_name, sizeof(ichan->eof_name), "IDMAC EOF %d", i);
1642
1643 dma_chan->device = &idmac->dma;
1644 dma_cookie_init(dma_chan);
1645 dma_chan->chan_id = i;
1646 list_add_tail(&dma_chan->device_node, &dma->channels);
1647 }
1648
1649 idmac_write_icreg(ipu, 0x00000070, IDMAC_CONF);
1650
1651 return dma_async_device_register(&idmac->dma);
1652 }
1653
1654 static void ipu_idmac_exit(struct ipu *ipu)
1655 {
1656 int i;
1657 struct idmac *idmac = &ipu->idmac;
1658
1659 for (i = 0; i < IPU_CHANNELS_NUM; i++) {
1660 struct idmac_channel *ichan = ipu->channel + i;
1661
1662 idmac_terminate_all(&ichan->dma_chan);
1663 }
1664
1665 dma_async_device_unregister(&idmac->dma);
1666 }
1667
1668 /*****************************************************************************
1669 * IPU common probe / remove
1670 */
1671
1672 static int __init ipu_probe(struct platform_device *pdev)
1673 {
1674 struct resource *mem_ipu, *mem_ic;
1675 int ret;
1676
1677 spin_lock_init(&ipu_data.lock);
1678
1679 mem_ipu = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1680 mem_ic = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1681 if (!mem_ipu || !mem_ic)
1682 return -EINVAL;
1683
1684 ipu_data.dev = &pdev->dev;
1685
1686 platform_set_drvdata(pdev, &ipu_data);
1687
1688 ret = platform_get_irq(pdev, 0);
1689 if (ret < 0)
1690 goto err_noirq;
1691
1692 ipu_data.irq_fn = ret;
1693 ret = platform_get_irq(pdev, 1);
1694 if (ret < 0)
1695 goto err_noirq;
1696
1697 ipu_data.irq_err = ret;
1698
1699 dev_dbg(&pdev->dev, "fn irq %u, err irq %u\n",
1700 ipu_data.irq_fn, ipu_data.irq_err);
1701
1702 /* Remap IPU common registers */
1703 ipu_data.reg_ipu = ioremap(mem_ipu->start, resource_size(mem_ipu));
1704 if (!ipu_data.reg_ipu) {
1705 ret = -ENOMEM;
1706 goto err_ioremap_ipu;
1707 }
1708
1709 /* Remap Image Converter and Image DMA Controller registers */
1710 ipu_data.reg_ic = ioremap(mem_ic->start, resource_size(mem_ic));
1711 if (!ipu_data.reg_ic) {
1712 ret = -ENOMEM;
1713 goto err_ioremap_ic;
1714 }
1715
1716 /* Get IPU clock */
1717 ipu_data.ipu_clk = clk_get(&pdev->dev, NULL);
1718 if (IS_ERR(ipu_data.ipu_clk)) {
1719 ret = PTR_ERR(ipu_data.ipu_clk);
1720 goto err_clk_get;
1721 }
1722
1723 /* Make sure IPU HSP clock is running */
1724 clk_prepare_enable(ipu_data.ipu_clk);
1725
1726 /* Disable all interrupts */
1727 idmac_write_ipureg(&ipu_data, 0, IPU_INT_CTRL_1);
1728 idmac_write_ipureg(&ipu_data, 0, IPU_INT_CTRL_2);
1729 idmac_write_ipureg(&ipu_data, 0, IPU_INT_CTRL_3);
1730 idmac_write_ipureg(&ipu_data, 0, IPU_INT_CTRL_4);
1731 idmac_write_ipureg(&ipu_data, 0, IPU_INT_CTRL_5);
1732
1733 dev_dbg(&pdev->dev, "%s @ 0x%08lx, fn irq %u, err irq %u\n", pdev->name,
1734 (unsigned long)mem_ipu->start, ipu_data.irq_fn, ipu_data.irq_err);
1735
1736 ret = ipu_irq_attach_irq(&ipu_data, pdev);
1737 if (ret < 0)
1738 goto err_attach_irq;
1739
1740 /* Initialize DMA engine */
1741 ret = ipu_idmac_init(&ipu_data);
1742 if (ret < 0)
1743 goto err_idmac_init;
1744
1745 tasklet_init(&ipu_data.tasklet, ipu_gc_tasklet, (unsigned long)&ipu_data);
1746
1747 ipu_data.dev = &pdev->dev;
1748
1749 dev_dbg(ipu_data.dev, "IPU initialized\n");
1750
1751 return 0;
1752
1753 err_idmac_init:
1754 err_attach_irq:
1755 ipu_irq_detach_irq(&ipu_data, pdev);
1756 clk_disable_unprepare(ipu_data.ipu_clk);
1757 clk_put(ipu_data.ipu_clk);
1758 err_clk_get:
1759 iounmap(ipu_data.reg_ic);
1760 err_ioremap_ic:
1761 iounmap(ipu_data.reg_ipu);
1762 err_ioremap_ipu:
1763 err_noirq:
1764 dev_err(&pdev->dev, "Failed to probe IPU: %d\n", ret);
1765 return ret;
1766 }
1767
1768 static int ipu_remove(struct platform_device *pdev)
1769 {
1770 struct ipu *ipu = platform_get_drvdata(pdev);
1771
1772 ipu_idmac_exit(ipu);
1773 ipu_irq_detach_irq(ipu, pdev);
1774 clk_disable_unprepare(ipu->ipu_clk);
1775 clk_put(ipu->ipu_clk);
1776 iounmap(ipu->reg_ic);
1777 iounmap(ipu->reg_ipu);
1778 tasklet_kill(&ipu->tasklet);
1779
1780 return 0;
1781 }
1782
1783 /*
1784 * We need two MEM resources - with IPU-common and Image Converter registers,
1785 * including PF_CONF and IDMAC_* registers, and two IRQs - function and error
1786 */
1787 static struct platform_driver ipu_platform_driver = {
1788 .driver = {
1789 .name = "ipu-core",
1790 },
1791 .remove = ipu_remove,
1792 };
1793
1794 static int __init ipu_init(void)
1795 {
1796 return platform_driver_probe(&ipu_platform_driver, ipu_probe);
1797 }
1798 subsys_initcall(ipu_init);
1799
1800 MODULE_DESCRIPTION("IPU core driver");
1801 MODULE_LICENSE("GPL v2");
1802 MODULE_AUTHOR("Guennadi Liakhovetski <lg@denx.de>");
1803 MODULE_ALIAS("platform:ipu-core");
Linux with added FPC-III support