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Merge tag 'block-5.11-2021-01-10' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / drivers / dma / ipu / ipu_idmac.c
blob104ad420abbeef91e444bfc51c326ac753b1fc18
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2008
4 * Guennadi Liakhovetski, DENX Software Engineering, <lg@denx.de>
5 *
6 * Copyright (C) 2005-2007 Freescale Semiconductor, Inc. All Rights Reserved.
7 */
8
9 #include <linux/dma-mapping.h>
10 #include <linux/init.h>
11 #include <linux/platform_device.h>
12 #include <linux/err.h>
13 #include <linux/spinlock.h>
14 #include <linux/delay.h>
15 #include <linux/list.h>
16 #include <linux/clk.h>
17 #include <linux/vmalloc.h>
18 #include <linux/string.h>
19 #include <linux/interrupt.h>
20 #include <linux/io.h>
21 #include <linux/module.h>
22 #include <linux/dma/ipu-dma.h>
23
24 #include "../dmaengine.h"
25 #include "ipu_intern.h"
26
27 #define FS_VF_IN_VALID 0x00000002
28 #define FS_ENC_IN_VALID 0x00000001
29
30 static int ipu_disable_channel(struct idmac *idmac, struct idmac_channel *ichan,
31 bool wait_for_stop);
32
33 /*
34 * There can be only one, we could allocate it dynamically, but then we'd have
35 * to add an extra parameter to some functions, and use something as ugly as
36 * struct ipu *ipu = to_ipu(to_idmac(ichan->dma_chan.device));
37 * in the ISR
38 */
39 static struct ipu ipu_data;
40
41 #define to_ipu(id) container_of(id, struct ipu, idmac)
42
43 static u32 __idmac_read_icreg(struct ipu *ipu, unsigned long reg)
44 {
45 return __raw_readl(ipu->reg_ic + reg);
46 }
47
48 #define idmac_read_icreg(ipu, reg) __idmac_read_icreg(ipu, reg - IC_CONF)
49
50 static void __idmac_write_icreg(struct ipu *ipu, u32 value, unsigned long reg)
51 {
52 __raw_writel(value, ipu->reg_ic + reg);
53 }
54
55 #define idmac_write_icreg(ipu, v, reg) __idmac_write_icreg(ipu, v, reg - IC_CONF)
56
57 static u32 idmac_read_ipureg(struct ipu *ipu, unsigned long reg)
58 {
59 return __raw_readl(ipu->reg_ipu + reg);
60 }
61
62 static void idmac_write_ipureg(struct ipu *ipu, u32 value, unsigned long reg)
63 {
64 __raw_writel(value, ipu->reg_ipu + reg);
65 }
66
67 /*****************************************************************************
68 * IPU / IC common functions
69 */
70 static void dump_idmac_reg(struct ipu *ipu)
71 {
72 dev_dbg(ipu->dev, "IDMAC_CONF 0x%x, IC_CONF 0x%x, IDMAC_CHA_EN 0x%x, "
73 "IDMAC_CHA_PRI 0x%x, IDMAC_CHA_BUSY 0x%x\n",
74 idmac_read_icreg(ipu, IDMAC_CONF),
75 idmac_read_icreg(ipu, IC_CONF),
76 idmac_read_icreg(ipu, IDMAC_CHA_EN),
77 idmac_read_icreg(ipu, IDMAC_CHA_PRI),
78 idmac_read_icreg(ipu, IDMAC_CHA_BUSY));
79 dev_dbg(ipu->dev, "BUF0_RDY 0x%x, BUF1_RDY 0x%x, CUR_BUF 0x%x, "
80 "DB_MODE 0x%x, TASKS_STAT 0x%x\n",
81 idmac_read_ipureg(ipu, IPU_CHA_BUF0_RDY),
82 idmac_read_ipureg(ipu, IPU_CHA_BUF1_RDY),
83 idmac_read_ipureg(ipu, IPU_CHA_CUR_BUF),
84 idmac_read_ipureg(ipu, IPU_CHA_DB_MODE_SEL),
85 idmac_read_ipureg(ipu, IPU_TASKS_STAT));
86 }
87
88 static uint32_t bytes_per_pixel(enum pixel_fmt fmt)
89 {
90 switch (fmt) {
91 case IPU_PIX_FMT_GENERIC: /* generic data */
92 case IPU_PIX_FMT_RGB332:
93 case IPU_PIX_FMT_YUV420P:
94 case IPU_PIX_FMT_YUV422P:
95 default:
96 return 1;
97 case IPU_PIX_FMT_RGB565:
98 case IPU_PIX_FMT_YUYV:
99 case IPU_PIX_FMT_UYVY:
100 return 2;
101 case IPU_PIX_FMT_BGR24:
102 case IPU_PIX_FMT_RGB24:
103 return 3;
104 case IPU_PIX_FMT_GENERIC_32: /* generic data */
105 case IPU_PIX_FMT_BGR32:
106 case IPU_PIX_FMT_RGB32:
107 case IPU_PIX_FMT_ABGR32:
108 return 4;
109 }
110 }
111
112 /* Enable direct write to memory by the Camera Sensor Interface */
113 static void ipu_ic_enable_task(struct ipu *ipu, enum ipu_channel channel)
114 {
115 uint32_t ic_conf, mask;
116
117 switch (channel) {
118 case IDMAC_IC_0:
119 mask = IC_CONF_PRPENC_EN;
120 break;
121 case IDMAC_IC_7:
122 mask = IC_CONF_RWS_EN | IC_CONF_PRPENC_EN;
123 break;
124 default:
125 return;
126 }
127 ic_conf = idmac_read_icreg(ipu, IC_CONF) | mask;
128 idmac_write_icreg(ipu, ic_conf, IC_CONF);
129 }
130
131 /* Called under spin_lock_irqsave(&ipu_data.lock) */
132 static void ipu_ic_disable_task(struct ipu *ipu, enum ipu_channel channel)
133 {
134 uint32_t ic_conf, mask;
135
136 switch (channel) {
137 case IDMAC_IC_0:
138 mask = IC_CONF_PRPENC_EN;
139 break;
140 case IDMAC_IC_7:
141 mask = IC_CONF_RWS_EN | IC_CONF_PRPENC_EN;
142 break;
143 default:
144 return;
145 }
146 ic_conf = idmac_read_icreg(ipu, IC_CONF) & ~mask;
147 idmac_write_icreg(ipu, ic_conf, IC_CONF);
148 }
149
150 static uint32_t ipu_channel_status(struct ipu *ipu, enum ipu_channel channel)
151 {
152 uint32_t stat = TASK_STAT_IDLE;
153 uint32_t task_stat_reg = idmac_read_ipureg(ipu, IPU_TASKS_STAT);
154
155 switch (channel) {
156 case IDMAC_IC_7:
157 stat = (task_stat_reg & TSTAT_CSI2MEM_MASK) >>
158 TSTAT_CSI2MEM_OFFSET;
159 break;
160 case IDMAC_IC_0:
161 case IDMAC_SDC_0:
162 case IDMAC_SDC_1:
163 default:
164 break;
165 }
166 return stat;
167 }
168
169 struct chan_param_mem_planar {
170 /* Word 0 */
171 u32 xv:10;
172 u32 yv:10;
173 u32 xb:12;
174
175 u32 yb:12;
176 u32 res1:2;
177 u32 nsb:1;
178 u32 lnpb:6;
179 u32 ubo_l:11;
180
181 u32 ubo_h:15;
182 u32 vbo_l:17;
183
184 u32 vbo_h:9;
185 u32 res2:3;
186 u32 fw:12;
187 u32 fh_l:8;
188
189 u32 fh_h:4;
190 u32 res3:28;
191
192 /* Word 1 */
193 u32 eba0;
194
195 u32 eba1;
196
197 u32 bpp:3;
198 u32 sl:14;
199 u32 pfs:3;
200 u32 bam:3;
201 u32 res4:2;
202 u32 npb:6;
203 u32 res5:1;
204
205 u32 sat:2;
206 u32 res6:30;
207 } __attribute__ ((packed));
208
209 struct chan_param_mem_interleaved {
210 /* Word 0 */
211 u32 xv:10;
212 u32 yv:10;
213 u32 xb:12;
214
215 u32 yb:12;
216 u32 sce:1;
217 u32 res1:1;
218 u32 nsb:1;
219 u32 lnpb:6;
220 u32 sx:10;
221 u32 sy_l:1;
222
223 u32 sy_h:9;
224 u32 ns:10;
225 u32 sm:10;
226 u32 sdx_l:3;
227
228 u32 sdx_h:2;
229 u32 sdy:5;
230 u32 sdrx:1;
231 u32 sdry:1;
232 u32 sdr1:1;
233 u32 res2:2;
234 u32 fw:12;
235 u32 fh_l:8;
236
237 u32 fh_h:4;
238 u32 res3:28;
239
240 /* Word 1 */
241 u32 eba0;
242
243 u32 eba1;
244
245 u32 bpp:3;
246 u32 sl:14;
247 u32 pfs:3;
248 u32 bam:3;
249 u32 res4:2;
250 u32 npb:6;
251 u32 res5:1;
252
253 u32 sat:2;
254 u32 scc:1;
255 u32 ofs0:5;
256 u32 ofs1:5;
257 u32 ofs2:5;
258 u32 ofs3:5;
259 u32 wid0:3;
260 u32 wid1:3;
261 u32 wid2:3;
262
263 u32 wid3:3;
264 u32 dec_sel:1;
265 u32 res6:28;
266 } __attribute__ ((packed));
267
268 union chan_param_mem {
269 struct chan_param_mem_planar pp;
270 struct chan_param_mem_interleaved ip;
271 };
272
273 static void ipu_ch_param_set_plane_offset(union chan_param_mem *params,
274 u32 u_offset, u32 v_offset)
275 {
276 params->pp.ubo_l = u_offset & 0x7ff;
277 params->pp.ubo_h = u_offset >> 11;
278 params->pp.vbo_l = v_offset & 0x1ffff;
279 params->pp.vbo_h = v_offset >> 17;
280 }
281
282 static void ipu_ch_param_set_size(union chan_param_mem *params,
283 uint32_t pixel_fmt, uint16_t width,
284 uint16_t height, uint16_t stride)
285 {
286 u32 u_offset;
287 u32 v_offset;
288
289 params->pp.fw = width - 1;
290 params->pp.fh_l = height - 1;
291 params->pp.fh_h = (height - 1) >> 8;
292 params->pp.sl = stride - 1;
293
294 switch (pixel_fmt) {
295 case IPU_PIX_FMT_GENERIC:
296 /*Represents 8-bit Generic data */
297 params->pp.bpp = 3;
298 params->pp.pfs = 7;
299 params->pp.npb = 31;
300 params->pp.sat = 2; /* SAT = use 32-bit access */
301 break;
302 case IPU_PIX_FMT_GENERIC_32:
303 /*Represents 32-bit Generic data */
304 params->pp.bpp = 0;
305 params->pp.pfs = 7;
306 params->pp.npb = 7;
307 params->pp.sat = 2; /* SAT = use 32-bit access */
308 break;
309 case IPU_PIX_FMT_RGB565:
310 params->ip.bpp = 2;
311 params->ip.pfs = 4;
312 params->ip.npb = 15;
313 params->ip.sat = 2; /* SAT = 32-bit access */
314 params->ip.ofs0 = 0; /* Red bit offset */
315 params->ip.ofs1 = 5; /* Green bit offset */
316 params->ip.ofs2 = 11; /* Blue bit offset */
317 params->ip.ofs3 = 16; /* Alpha bit offset */
318 params->ip.wid0 = 4; /* Red bit width - 1 */
319 params->ip.wid1 = 5; /* Green bit width - 1 */
320 params->ip.wid2 = 4; /* Blue bit width - 1 */
321 break;
322 case IPU_PIX_FMT_BGR24:
323 params->ip.bpp = 1; /* 24 BPP & RGB PFS */
324 params->ip.pfs = 4;
325 params->ip.npb = 7;
326 params->ip.sat = 2; /* SAT = 32-bit access */
327 params->ip.ofs0 = 0; /* Red bit offset */
328 params->ip.ofs1 = 8; /* Green bit offset */
329 params->ip.ofs2 = 16; /* Blue bit offset */
330 params->ip.ofs3 = 24; /* Alpha bit offset */
331 params->ip.wid0 = 7; /* Red bit width - 1 */
332 params->ip.wid1 = 7; /* Green bit width - 1 */
333 params->ip.wid2 = 7; /* Blue bit width - 1 */
334 break;
335 case IPU_PIX_FMT_RGB24:
336 params->ip.bpp = 1; /* 24 BPP & RGB PFS */
337 params->ip.pfs = 4;
338 params->ip.npb = 7;
339 params->ip.sat = 2; /* SAT = 32-bit access */
340 params->ip.ofs0 = 16; /* Red bit offset */
341 params->ip.ofs1 = 8; /* Green bit offset */
342 params->ip.ofs2 = 0; /* Blue bit offset */
343 params->ip.ofs3 = 24; /* Alpha bit offset */
344 params->ip.wid0 = 7; /* Red bit width - 1 */
345 params->ip.wid1 = 7; /* Green bit width - 1 */
346 params->ip.wid2 = 7; /* Blue bit width - 1 */
347 break;
348 case IPU_PIX_FMT_BGRA32:
349 case IPU_PIX_FMT_BGR32:
350 case IPU_PIX_FMT_ABGR32:
351 params->ip.bpp = 0;
352 params->ip.pfs = 4;
353 params->ip.npb = 7;
354 params->ip.sat = 2; /* SAT = 32-bit access */
355 params->ip.ofs0 = 8; /* Red bit offset */
356 params->ip.ofs1 = 16; /* Green bit offset */
357 params->ip.ofs2 = 24; /* Blue bit offset */
358 params->ip.ofs3 = 0; /* Alpha bit offset */
359 params->ip.wid0 = 7; /* Red bit width - 1 */
360 params->ip.wid1 = 7; /* Green bit width - 1 */
361 params->ip.wid2 = 7; /* Blue bit width - 1 */
362 params->ip.wid3 = 7; /* Alpha bit width - 1 */
363 break;
364 case IPU_PIX_FMT_RGBA32:
365 case IPU_PIX_FMT_RGB32:
366 params->ip.bpp = 0;
367 params->ip.pfs = 4;
368 params->ip.npb = 7;
369 params->ip.sat = 2; /* SAT = 32-bit access */
370 params->ip.ofs0 = 24; /* Red bit offset */
371 params->ip.ofs1 = 16; /* Green bit offset */
372 params->ip.ofs2 = 8; /* Blue bit offset */
373 params->ip.ofs3 = 0; /* Alpha bit offset */
374 params->ip.wid0 = 7; /* Red bit width - 1 */
375 params->ip.wid1 = 7; /* Green bit width - 1 */
376 params->ip.wid2 = 7; /* Blue bit width - 1 */
377 params->ip.wid3 = 7; /* Alpha bit width - 1 */
378 break;
379 case IPU_PIX_FMT_UYVY:
380 params->ip.bpp = 2;
381 params->ip.pfs = 6;
382 params->ip.npb = 7;
383 params->ip.sat = 2; /* SAT = 32-bit access */
384 break;
385 case IPU_PIX_FMT_YUV420P2:
386 case IPU_PIX_FMT_YUV420P:
387 params->ip.bpp = 3;
388 params->ip.pfs = 3;
389 params->ip.npb = 7;
390 params->ip.sat = 2; /* SAT = 32-bit access */
391 u_offset = stride * height;
392 v_offset = u_offset + u_offset / 4;
393 ipu_ch_param_set_plane_offset(params, u_offset, v_offset);
394 break;
395 case IPU_PIX_FMT_YVU422P:
396 params->ip.bpp = 3;
397 params->ip.pfs = 2;
398 params->ip.npb = 7;
399 params->ip.sat = 2; /* SAT = 32-bit access */
400 v_offset = stride * height;
401 u_offset = v_offset + v_offset / 2;
402 ipu_ch_param_set_plane_offset(params, u_offset, v_offset);
403 break;
404 case IPU_PIX_FMT_YUV422P:
405 params->ip.bpp = 3;
406 params->ip.pfs = 2;
407 params->ip.npb = 7;
408 params->ip.sat = 2; /* SAT = 32-bit access */
409 u_offset = stride * height;
410 v_offset = u_offset + u_offset / 2;
411 ipu_ch_param_set_plane_offset(params, u_offset, v_offset);
412 break;
413 default:
414 dev_err(ipu_data.dev,
415 "mx3 ipu: unimplemented pixel format %d\n", pixel_fmt);
416 break;
417 }
418
419 params->pp.nsb = 1;
420 }
421
422 static void ipu_ch_param_set_buffer(union chan_param_mem *params,
423 dma_addr_t buf0, dma_addr_t buf1)
424 {
425 params->pp.eba0 = buf0;
426 params->pp.eba1 = buf1;
427 }
428
429 static void ipu_ch_param_set_rotation(union chan_param_mem *params,
430 enum ipu_rotate_mode rotate)
431 {
432 params->pp.bam = rotate;
433 }
434
435 static void ipu_write_param_mem(uint32_t addr, uint32_t *data,
436 uint32_t num_words)
437 {
438 for (; num_words > 0; num_words--) {
439 dev_dbg(ipu_data.dev,
440 "write param mem - addr = 0x%08X, data = 0x%08X\n",
441 addr, *data);
442 idmac_write_ipureg(&ipu_data, addr, IPU_IMA_ADDR);
443 idmac_write_ipureg(&ipu_data, *data++, IPU_IMA_DATA);
444 addr++;
445 if ((addr & 0x7) == 5) {
446 addr &= ~0x7; /* set to word 0 */
447 addr += 8; /* increment to next row */
448 }
449 }
450 }
451
452 static int calc_resize_coeffs(uint32_t in_size, uint32_t out_size,
453 uint32_t *resize_coeff,
454 uint32_t *downsize_coeff)
455 {
456 uint32_t temp_size;
457 uint32_t temp_downsize;
458
459 *resize_coeff = 1 << 13;
460 *downsize_coeff = 1 << 13;
461
462 /* Cannot downsize more than 8:1 */
463 if (out_size << 3 < in_size)
464 return -EINVAL;
465
466 /* compute downsizing coefficient */
467 temp_downsize = 0;
468 temp_size = in_size;
469 while (temp_size >= out_size * 2 && temp_downsize < 2) {
470 temp_size >>= 1;
471 temp_downsize++;
472 }
473 *downsize_coeff = temp_downsize;
474
475 /*
476 * compute resizing coefficient using the following formula:
477 * resize_coeff = M*(SI -1)/(SO - 1)
478 * where M = 2^13, SI - input size, SO - output size
479 */
480 *resize_coeff = (8192L * (temp_size - 1)) / (out_size - 1);
481 if (*resize_coeff >= 16384L) {
482 dev_err(ipu_data.dev, "Warning! Overflow on resize coeff.\n");
483 *resize_coeff = 0x3FFF;
484 }
485
486 dev_dbg(ipu_data.dev, "resizing from %u -> %u pixels, "
487 "downsize=%u, resize=%u.%lu (reg=%u)\n", in_size, out_size,
488 *downsize_coeff, *resize_coeff >= 8192L ? 1 : 0,
489 ((*resize_coeff & 0x1FFF) * 10000L) / 8192L, *resize_coeff);
490
491 return 0;
492 }
493
494 static enum ipu_color_space format_to_colorspace(enum pixel_fmt fmt)
495 {
496 switch (fmt) {
497 case IPU_PIX_FMT_RGB565:
498 case IPU_PIX_FMT_BGR24:
499 case IPU_PIX_FMT_RGB24:
500 case IPU_PIX_FMT_BGR32:
501 case IPU_PIX_FMT_RGB32:
502 return IPU_COLORSPACE_RGB;
503 default:
504 return IPU_COLORSPACE_YCBCR;
505 }
506 }
507
508 static int ipu_ic_init_prpenc(struct ipu *ipu,
509 union ipu_channel_param *params, bool src_is_csi)
510 {
511 uint32_t reg, ic_conf;
512 uint32_t downsize_coeff, resize_coeff;
513 enum ipu_color_space in_fmt, out_fmt;
514
515 /* Setup vertical resizing */
516 calc_resize_coeffs(params->video.in_height,
517 params->video.out_height,
518 &resize_coeff, &downsize_coeff);
519 reg = (downsize_coeff << 30) | (resize_coeff << 16);
520
521 /* Setup horizontal resizing */
522 calc_resize_coeffs(params->video.in_width,
523 params->video.out_width,
524 &resize_coeff, &downsize_coeff);
525 reg |= (downsize_coeff << 14) | resize_coeff;
526
527 /* Setup color space conversion */
528 in_fmt = format_to_colorspace(params->video.in_pixel_fmt);
529 out_fmt = format_to_colorspace(params->video.out_pixel_fmt);
530
531 /*
532 * Colourspace conversion unsupported yet - see _init_csc() in
533 * Freescale sources
534 */
535 if (in_fmt != out_fmt) {
536 dev_err(ipu->dev, "Colourspace conversion unsupported!\n");
537 return -EOPNOTSUPP;
538 }
539
540 idmac_write_icreg(ipu, reg, IC_PRP_ENC_RSC);
541
542 ic_conf = idmac_read_icreg(ipu, IC_CONF);
543
544 if (src_is_csi)
545 ic_conf &= ~IC_CONF_RWS_EN;
546 else
547 ic_conf |= IC_CONF_RWS_EN;
548
549 idmac_write_icreg(ipu, ic_conf, IC_CONF);
550
551 return 0;
552 }
553
554 static uint32_t dma_param_addr(uint32_t dma_ch)
555 {
556 /* Channel Parameter Memory */
557 return 0x10000 | (dma_ch << 4);
558 }
559
560 static void ipu_channel_set_priority(struct ipu *ipu, enum ipu_channel channel,
561 bool prio)
562 {
563 u32 reg = idmac_read_icreg(ipu, IDMAC_CHA_PRI);
564
565 if (prio)
566 reg |= 1UL << channel;
567 else
568 reg &= ~(1UL << channel);
569
570 idmac_write_icreg(ipu, reg, IDMAC_CHA_PRI);
571
572 dump_idmac_reg(ipu);
573 }
574
575 static uint32_t ipu_channel_conf_mask(enum ipu_channel channel)
576 {
577 uint32_t mask;
578
579 switch (channel) {
580 case IDMAC_IC_0:
581 case IDMAC_IC_7:
582 mask = IPU_CONF_CSI_EN | IPU_CONF_IC_EN;
583 break;
584 case IDMAC_SDC_0:
585 case IDMAC_SDC_1:
586 mask = IPU_CONF_SDC_EN | IPU_CONF_DI_EN;
587 break;
588 default:
589 mask = 0;
590 break;
591 }
592
593 return mask;
594 }
595
596 /**
597 * ipu_enable_channel() - enable an IPU channel.
598 * @idmac: IPU DMAC context.
599 * @ichan: IDMAC channel.
600 * @return: 0 on success or negative error code on failure.
601 */
602 static int ipu_enable_channel(struct idmac *idmac, struct idmac_channel *ichan)
603 {
604 struct ipu *ipu = to_ipu(idmac);
605 enum ipu_channel channel = ichan->dma_chan.chan_id;
606 uint32_t reg;
607 unsigned long flags;
608
609 spin_lock_irqsave(&ipu->lock, flags);
610
611 /* Reset to buffer 0 */
612 idmac_write_ipureg(ipu, 1UL << channel, IPU_CHA_CUR_BUF);
613 ichan->active_buffer = 0;
614 ichan->status = IPU_CHANNEL_ENABLED;
615
616 switch (channel) {
617 case IDMAC_SDC_0:
618 case IDMAC_SDC_1:
619 case IDMAC_IC_7:
620 ipu_channel_set_priority(ipu, channel, true);
621 default:
622 break;
623 }
624
625 reg = idmac_read_icreg(ipu, IDMAC_CHA_EN);
626
627 idmac_write_icreg(ipu, reg | (1UL << channel), IDMAC_CHA_EN);
628
629 ipu_ic_enable_task(ipu, channel);
630
631 spin_unlock_irqrestore(&ipu->lock, flags);
632 return 0;
633 }
634
635 /**
636 * ipu_init_channel_buffer() - initialize a buffer for logical IPU channel.
637 * @ichan: IDMAC channel.
638 * @pixel_fmt: pixel format of buffer. Pixel format is a FOURCC ASCII code.
639 * @width: width of buffer in pixels.
640 * @height: height of buffer in pixels.
641 * @stride: stride length of buffer in pixels.
642 * @rot_mode: rotation mode of buffer. A rotation setting other than
643 * IPU_ROTATE_VERT_FLIP should only be used for input buffers of
644 * rotation channels.
645 * @phyaddr_0: buffer 0 physical address.
646 * @phyaddr_1: buffer 1 physical address. Setting this to a value other than
647 * NULL enables double buffering mode.
648 * @return: 0 on success or negative error code on failure.
649 */
650 static int ipu_init_channel_buffer(struct idmac_channel *ichan,
651 enum pixel_fmt pixel_fmt,
652 uint16_t width, uint16_t height,
653 uint32_t stride,
654 enum ipu_rotate_mode rot_mode,
655 dma_addr_t phyaddr_0, dma_addr_t phyaddr_1)
656 {
657 enum ipu_channel channel = ichan->dma_chan.chan_id;
658 struct idmac *idmac = to_idmac(ichan->dma_chan.device);
659 struct ipu *ipu = to_ipu(idmac);
660 union chan_param_mem params = {};
661 unsigned long flags;
662 uint32_t reg;
663 uint32_t stride_bytes;
664
665 stride_bytes = stride * bytes_per_pixel(pixel_fmt);
666
667 if (stride_bytes % 4) {
668 dev_err(ipu->dev,
669 "Stride length must be 32-bit aligned, stride = %d, bytes = %d\n",
670 stride, stride_bytes);
671 return -EINVAL;
672 }
673
674 /* IC channel's stride must be a multiple of 8 pixels */
675 if ((channel <= IDMAC_IC_13) && (stride % 8)) {
676 dev_err(ipu->dev, "Stride must be 8 pixel multiple\n");
677 return -EINVAL;
678 }
679
680 /* Build parameter memory data for DMA channel */
681 ipu_ch_param_set_size(&params, pixel_fmt, width, height, stride_bytes);
682 ipu_ch_param_set_buffer(&params, phyaddr_0, phyaddr_1);
683 ipu_ch_param_set_rotation(&params, rot_mode);
684
685 spin_lock_irqsave(&ipu->lock, flags);
686
687 ipu_write_param_mem(dma_param_addr(channel), (uint32_t *)&params, 10);
688
689 reg = idmac_read_ipureg(ipu, IPU_CHA_DB_MODE_SEL);
690
691 if (phyaddr_1)
692 reg |= 1UL << channel;
693 else
694 reg &= ~(1UL << channel);
695
696 idmac_write_ipureg(ipu, reg, IPU_CHA_DB_MODE_SEL);
697
698 ichan->status = IPU_CHANNEL_READY;
699
700 spin_unlock_irqrestore(&ipu->lock, flags);
701
702 return 0;
703 }
704
705 /**
706 * ipu_select_buffer() - mark a channel's buffer as ready.
707 * @channel: channel ID.
708 * @buffer_n: buffer number to mark ready.
709 */
710 static void ipu_select_buffer(enum ipu_channel channel, int buffer_n)
711 {
712 /* No locking - this is a write-one-to-set register, cleared by IPU */
713 if (buffer_n == 0)
714 /* Mark buffer 0 as ready. */
715 idmac_write_ipureg(&ipu_data, 1UL << channel, IPU_CHA_BUF0_RDY);
716 else
717 /* Mark buffer 1 as ready. */
718 idmac_write_ipureg(&ipu_data, 1UL << channel, IPU_CHA_BUF1_RDY);
719 }
720
721 /**
722 * ipu_update_channel_buffer() - update physical address of a channel buffer.
723 * @ichan: IDMAC channel.
724 * @buffer_n: buffer number to update.
725 * 0 or 1 are the only valid values.
726 * @phyaddr: buffer physical address.
727 */
728 /* Called under spin_lock(_irqsave)(&ichan->lock) */
729 static void ipu_update_channel_buffer(struct idmac_channel *ichan,
730 int buffer_n, dma_addr_t phyaddr)
731 {
732 enum ipu_channel channel = ichan->dma_chan.chan_id;
733 uint32_t reg;
734 unsigned long flags;
735
736 spin_lock_irqsave(&ipu_data.lock, flags);
737
738 if (buffer_n == 0) {
739 reg = idmac_read_ipureg(&ipu_data, IPU_CHA_BUF0_RDY);
740 if (reg & (1UL << channel)) {
741 ipu_ic_disable_task(&ipu_data, channel);
742 ichan->status = IPU_CHANNEL_READY;
743 }
744
745 /* 44.3.3.1.9 - Row Number 1 (WORD1, offset 0) */
746 idmac_write_ipureg(&ipu_data, dma_param_addr(channel) +
747 0x0008UL, IPU_IMA_ADDR);
748 idmac_write_ipureg(&ipu_data, phyaddr, IPU_IMA_DATA);
749 } else {
750 reg = idmac_read_ipureg(&ipu_data, IPU_CHA_BUF1_RDY);
751 if (reg & (1UL << channel)) {
752 ipu_ic_disable_task(&ipu_data, channel);
753 ichan->status = IPU_CHANNEL_READY;
754 }
755
756 /* Check if double-buffering is already enabled */
757 reg = idmac_read_ipureg(&ipu_data, IPU_CHA_DB_MODE_SEL);
758
759 if (!(reg & (1UL << channel)))
760 idmac_write_ipureg(&ipu_data, reg | (1UL << channel),
761 IPU_CHA_DB_MODE_SEL);
762
763 /* 44.3.3.1.9 - Row Number 1 (WORD1, offset 1) */
764 idmac_write_ipureg(&ipu_data, dma_param_addr(channel) +
765 0x0009UL, IPU_IMA_ADDR);
766 idmac_write_ipureg(&ipu_data, phyaddr, IPU_IMA_DATA);
767 }
768
769 spin_unlock_irqrestore(&ipu_data.lock, flags);
770 }
771
772 /* Called under spin_lock_irqsave(&ichan->lock) */
773 static int ipu_submit_buffer(struct idmac_channel *ichan,
774 struct idmac_tx_desc *desc, struct scatterlist *sg, int buf_idx)
775 {
776 unsigned int chan_id = ichan->dma_chan.chan_id;
777 struct device *dev = &ichan->dma_chan.dev->device;
778
779 if (async_tx_test_ack(&desc->txd))
780 return -EINTR;
781
782 /*
783 * On first invocation this shouldn't be necessary, the call to
784 * ipu_init_channel_buffer() above will set addresses for us, so we
785 * could make it conditional on status >= IPU_CHANNEL_ENABLED, but
786 * doing it again shouldn't hurt either.
787 */
788 ipu_update_channel_buffer(ichan, buf_idx, sg_dma_address(sg));
789
790 ipu_select_buffer(chan_id, buf_idx);
791 dev_dbg(dev, "Updated sg %p on channel 0x%x buffer %d\n",
792 sg, chan_id, buf_idx);
793
794 return 0;
795 }
796
797 /* Called under spin_lock_irqsave(&ichan->lock) */
798 static int ipu_submit_channel_buffers(struct idmac_channel *ichan,
799 struct idmac_tx_desc *desc)
800 {
801 struct scatterlist *sg;
802 int i, ret = 0;
803
804 for (i = 0, sg = desc->sg; i < 2 && sg; i++) {
805 if (!ichan->sg[i]) {
806 ichan->sg[i] = sg;
807
808 ret = ipu_submit_buffer(ichan, desc, sg, i);
809 if (ret < 0)
810 return ret;
811
812 sg = sg_next(sg);
813 }
814 }
815
816 return ret;
817 }
818
819 static dma_cookie_t idmac_tx_submit(struct dma_async_tx_descriptor *tx)
820 {
821 struct idmac_tx_desc *desc = to_tx_desc(tx);
822 struct idmac_channel *ichan = to_idmac_chan(tx->chan);
823 struct idmac *idmac = to_idmac(tx->chan->device);
824 struct ipu *ipu = to_ipu(idmac);
825 struct device *dev = &ichan->dma_chan.dev->device;
826 dma_cookie_t cookie;
827 unsigned long flags;
828 int ret;
829
830 /* Sanity check */
831 if (!list_empty(&desc->list)) {
832 /* The descriptor doesn't belong to client */
833 dev_err(dev, "Descriptor %p not prepared!\n", tx);
834 return -EBUSY;
835 }
836
837 mutex_lock(&ichan->chan_mutex);
838
839 async_tx_clear_ack(tx);
840
841 if (ichan->status < IPU_CHANNEL_READY) {
842 struct idmac_video_param *video = &ichan->params.video;
843 /*
844 * Initial buffer assignment - the first two sg-entries from
845 * the descriptor will end up in the IDMAC buffers
846 */
847 dma_addr_t dma_1 = sg_is_last(desc->sg) ? 0 :
848 sg_dma_address(&desc->sg[1]);
849
850 WARN_ON(ichan->sg[0] || ichan->sg[1]);
851
852 cookie = ipu_init_channel_buffer(ichan,
853 video->out_pixel_fmt,
854 video->out_width,
855 video->out_height,
856 video->out_stride,
857 IPU_ROTATE_NONE,
858 sg_dma_address(&desc->sg[0]),
859 dma_1);
860 if (cookie < 0)
861 goto out;
862 }
863
864 dev_dbg(dev, "Submitting sg %p\n", &desc->sg[0]);
865
866 cookie = dma_cookie_assign(tx);
867
868 /* ipu->lock can be taken under ichan->lock, but not v.v. */
869 spin_lock_irqsave(&ichan->lock, flags);
870
871 list_add_tail(&desc->list, &ichan->queue);
872 /* submit_buffers() atomically verifies and fills empty sg slots */
873 ret = ipu_submit_channel_buffers(ichan, desc);
874
875 spin_unlock_irqrestore(&ichan->lock, flags);
876
877 if (ret < 0) {
878 cookie = ret;
879 goto dequeue;
880 }
881
882 if (ichan->status < IPU_CHANNEL_ENABLED) {
883 ret = ipu_enable_channel(idmac, ichan);
884 if (ret < 0) {
885 cookie = ret;
886 goto dequeue;
887 }
888 }
889
890 dump_idmac_reg(ipu);
891
892 dequeue:
893 if (cookie < 0) {
894 spin_lock_irqsave(&ichan->lock, flags);
895 list_del_init(&desc->list);
896 spin_unlock_irqrestore(&ichan->lock, flags);
897 tx->cookie = cookie;
898 ichan->dma_chan.cookie = cookie;
899 }
900
901 out:
902 mutex_unlock(&ichan->chan_mutex);
903
904 return cookie;
905 }
906
907 /* Called with ichan->chan_mutex held */
908 static int idmac_desc_alloc(struct idmac_channel *ichan, int n)
909 {
910 struct idmac_tx_desc *desc =
911 vmalloc(array_size(n, sizeof(struct idmac_tx_desc)));
912 struct idmac *idmac = to_idmac(ichan->dma_chan.device);
913
914 if (!desc)
915 return -ENOMEM;
916
917 /* No interrupts, just disable the tasklet for a moment */
918 tasklet_disable(&to_ipu(idmac)->tasklet);
919
920 ichan->n_tx_desc = n;
921 ichan->desc = desc;
922 INIT_LIST_HEAD(&ichan->queue);
923 INIT_LIST_HEAD(&ichan->free_list);
924
925 while (n--) {
926 struct dma_async_tx_descriptor *txd = &desc->txd;
927
928 memset(txd, 0, sizeof(*txd));
929 dma_async_tx_descriptor_init(txd, &ichan->dma_chan);
930 txd->tx_submit = idmac_tx_submit;
931
932 list_add(&desc->list, &ichan->free_list);
933
934 desc++;
935 }
936
937 tasklet_enable(&to_ipu(idmac)->tasklet);
938
939 return 0;
940 }
941
942 /**
943 * ipu_init_channel() - initialize an IPU channel.
944 * @idmac: IPU DMAC context.
945 * @ichan: pointer to the channel object.
946 * @return 0 on success or negative error code on failure.
947 */
948 static int ipu_init_channel(struct idmac *idmac, struct idmac_channel *ichan)
949 {
950 union ipu_channel_param *params = &ichan->params;
951 uint32_t ipu_conf;
952 enum ipu_channel channel = ichan->dma_chan.chan_id;
953 unsigned long flags;
954 uint32_t reg;
955 struct ipu *ipu = to_ipu(idmac);
956 int ret = 0, n_desc = 0;
957
958 dev_dbg(ipu->dev, "init channel = %d\n", channel);
959
960 if (channel != IDMAC_SDC_0 && channel != IDMAC_SDC_1 &&
961 channel != IDMAC_IC_7)
962 return -EINVAL;
963
964 spin_lock_irqsave(&ipu->lock, flags);
965
966 switch (channel) {
967 case IDMAC_IC_7:
968 n_desc = 16;
969 reg = idmac_read_icreg(ipu, IC_CONF);
970 idmac_write_icreg(ipu, reg & ~IC_CONF_CSI_MEM_WR_EN, IC_CONF);
971 break;
972 case IDMAC_IC_0:
973 n_desc = 16;
974 reg = idmac_read_ipureg(ipu, IPU_FS_PROC_FLOW);
975 idmac_write_ipureg(ipu, reg & ~FS_ENC_IN_VALID, IPU_FS_PROC_FLOW);
976 ret = ipu_ic_init_prpenc(ipu, params, true);
977 break;
978 case IDMAC_SDC_0:
979 case IDMAC_SDC_1:
980 n_desc = 4;
981 default:
982 break;
983 }
984
985 ipu->channel_init_mask |= 1L << channel;
986
987 /* Enable IPU sub module */
988 ipu_conf = idmac_read_ipureg(ipu, IPU_CONF) |
989 ipu_channel_conf_mask(channel);
990 idmac_write_ipureg(ipu, ipu_conf, IPU_CONF);
991
992 spin_unlock_irqrestore(&ipu->lock, flags);
993
994 if (n_desc && !ichan->desc)
995 ret = idmac_desc_alloc(ichan, n_desc);
996
997 dump_idmac_reg(ipu);
998
999 return ret;
1000 }
1001
1002 /**
1003 * ipu_uninit_channel() - uninitialize an IPU channel.
1004 * @idmac: IPU DMAC context.
1005 * @ichan: pointer to the channel object.
1006 */
1007 static void ipu_uninit_channel(struct idmac *idmac, struct idmac_channel *ichan)
1008 {
1009 enum ipu_channel channel = ichan->dma_chan.chan_id;
1010 unsigned long flags;
1011 uint32_t reg;
1012 unsigned long chan_mask = 1UL << channel;
1013 uint32_t ipu_conf;
1014 struct ipu *ipu = to_ipu(idmac);
1015
1016 spin_lock_irqsave(&ipu->lock, flags);
1017
1018 if (!(ipu->channel_init_mask & chan_mask)) {
1019 dev_err(ipu->dev, "Channel already uninitialized %d\n",
1020 channel);
1021 spin_unlock_irqrestore(&ipu->lock, flags);
1022 return;
1023 }
1024
1025 /* Reset the double buffer */
1026 reg = idmac_read_ipureg(ipu, IPU_CHA_DB_MODE_SEL);
1027 idmac_write_ipureg(ipu, reg & ~chan_mask, IPU_CHA_DB_MODE_SEL);
1028
1029 ichan->sec_chan_en = false;
1030
1031 switch (channel) {
1032 case IDMAC_IC_7:
1033 reg = idmac_read_icreg(ipu, IC_CONF);
1034 idmac_write_icreg(ipu, reg & ~(IC_CONF_RWS_EN | IC_CONF_PRPENC_EN),
1035 IC_CONF);
1036 break;
1037 case IDMAC_IC_0:
1038 reg = idmac_read_icreg(ipu, IC_CONF);
1039 idmac_write_icreg(ipu, reg & ~(IC_CONF_PRPENC_EN | IC_CONF_PRPENC_CSC1),
1040 IC_CONF);
1041 break;
1042 case IDMAC_SDC_0:
1043 case IDMAC_SDC_1:
1044 default:
1045 break;
1046 }
1047
1048 ipu->channel_init_mask &= ~(1L << channel);
1049
1050 ipu_conf = idmac_read_ipureg(ipu, IPU_CONF) &
1051 ~ipu_channel_conf_mask(channel);
1052 idmac_write_ipureg(ipu, ipu_conf, IPU_CONF);
1053
1054 spin_unlock_irqrestore(&ipu->lock, flags);
1055
1056 ichan->n_tx_desc = 0;
1057 vfree(ichan->desc);
1058 ichan->desc = NULL;
1059 }
1060
1061 /**
1062 * ipu_disable_channel() - disable an IPU channel.
1063 * @idmac: IPU DMAC context.
1064 * @ichan: channel object pointer.
1065 * @wait_for_stop: flag to set whether to wait for channel end of frame or
1066 * return immediately.
1067 * @return: 0 on success or negative error code on failure.
1068 */
1069 static int ipu_disable_channel(struct idmac *idmac, struct idmac_channel *ichan,
1070 bool wait_for_stop)
1071 {
1072 enum ipu_channel channel = ichan->dma_chan.chan_id;
1073 struct ipu *ipu = to_ipu(idmac);
1074 uint32_t reg;
1075 unsigned long flags;
1076 unsigned long chan_mask = 1UL << channel;
1077 unsigned int timeout;
1078
1079 if (wait_for_stop && channel != IDMAC_SDC_1 && channel != IDMAC_SDC_0) {
1080 timeout = 40;
1081 /* This waiting always fails. Related to spurious irq problem */
1082 while ((idmac_read_icreg(ipu, IDMAC_CHA_BUSY) & chan_mask) ||
1083 (ipu_channel_status(ipu, channel) == TASK_STAT_ACTIVE)) {
1084 timeout--;
1085 msleep(10);
1086
1087 if (!timeout) {
1088 dev_dbg(ipu->dev,
1089 "Warning: timeout waiting for channel %u to "
1090 "stop: buf0_rdy = 0x%08X, buf1_rdy = 0x%08X, "
1091 "busy = 0x%08X, tstat = 0x%08X\n", channel,
1092 idmac_read_ipureg(ipu, IPU_CHA_BUF0_RDY),
1093 idmac_read_ipureg(ipu, IPU_CHA_BUF1_RDY),
1094 idmac_read_icreg(ipu, IDMAC_CHA_BUSY),
1095 idmac_read_ipureg(ipu, IPU_TASKS_STAT));
1096 break;
1097 }
1098 }
1099 dev_dbg(ipu->dev, "timeout = %d * 10ms\n", 40 - timeout);
1100 }
1101 /* SDC BG and FG must be disabled before DMA is disabled */
1102 if (wait_for_stop && (channel == IDMAC_SDC_0 ||
1103 channel == IDMAC_SDC_1)) {
1104 for (timeout = 5;
1105 timeout && !ipu_irq_status(ichan->eof_irq); timeout--)
1106 msleep(5);
1107 }
1108
1109 spin_lock_irqsave(&ipu->lock, flags);
1110
1111 /* Disable IC task */
1112 ipu_ic_disable_task(ipu, channel);
1113
1114 /* Disable DMA channel(s) */
1115 reg = idmac_read_icreg(ipu, IDMAC_CHA_EN);
1116 idmac_write_icreg(ipu, reg & ~chan_mask, IDMAC_CHA_EN);
1117
1118 spin_unlock_irqrestore(&ipu->lock, flags);
1119
1120 return 0;
1121 }
1122
1123 static struct scatterlist *idmac_sg_next(struct idmac_channel *ichan,
1124 struct idmac_tx_desc **desc, struct scatterlist *sg)
1125 {
1126 struct scatterlist *sgnew = sg ? sg_next(sg) : NULL;
1127
1128 if (sgnew)
1129 /* next sg-element in this list */
1130 return sgnew;
1131
1132 if ((*desc)->list.next == &ichan->queue)
1133 /* No more descriptors on the queue */
1134 return NULL;
1135
1136 /* Fetch next descriptor */
1137 *desc = list_entry((*desc)->list.next, struct idmac_tx_desc, list);
1138 return (*desc)->sg;
1139 }
1140
1141 /*
1142 * We have several possibilities here:
1143 * current BUF next BUF
1144 *
1145 * not last sg next not last sg
1146 * not last sg next last sg
1147 * last sg first sg from next descriptor
1148 * last sg NULL
1149 *
1150 * Besides, the descriptor queue might be empty or not. We process all these
1151 * cases carefully.
1152 */
1153 static irqreturn_t idmac_interrupt(int irq, void *dev_id)
1154 {
1155 struct idmac_channel *ichan = dev_id;
1156 struct device *dev = &ichan->dma_chan.dev->device;
1157 unsigned int chan_id = ichan->dma_chan.chan_id;
1158 struct scatterlist **sg, *sgnext, *sgnew = NULL;
1159 /* Next transfer descriptor */
1160 struct idmac_tx_desc *desc, *descnew;
1161 bool done = false;
1162 u32 ready0, ready1, curbuf, err;
1163 struct dmaengine_desc_callback cb;
1164
1165 /* IDMAC has cleared the respective BUFx_RDY bit, we manage the buffer */
1166
1167 dev_dbg(dev, "IDMAC irq %d, buf %d\n", irq, ichan->active_buffer);
1168
1169 spin_lock(&ipu_data.lock);
1170
1171 ready0 = idmac_read_ipureg(&ipu_data, IPU_CHA_BUF0_RDY);
1172 ready1 = idmac_read_ipureg(&ipu_data, IPU_CHA_BUF1_RDY);
1173 curbuf = idmac_read_ipureg(&ipu_data, IPU_CHA_CUR_BUF);
1174 err = idmac_read_ipureg(&ipu_data, IPU_INT_STAT_4);
1175
1176 if (err & (1 << chan_id)) {
1177 idmac_write_ipureg(&ipu_data, 1 << chan_id, IPU_INT_STAT_4);
1178 spin_unlock(&ipu_data.lock);
1179 /*
1180 * Doing this
1181 * ichan->sg[0] = ichan->sg[1] = NULL;
1182 * you can force channel re-enable on the next tx_submit(), but
1183 * this is dirty - think about descriptors with multiple
1184 * sg elements.
1185 */
1186 dev_warn(dev, "NFB4EOF on channel %d, ready %x, %x, cur %x\n",
1187 chan_id, ready0, ready1, curbuf);
1188 return IRQ_HANDLED;
1189 }
1190 spin_unlock(&ipu_data.lock);
1191
1192 /* Other interrupts do not interfere with this channel */
1193 spin_lock(&ichan->lock);
1194 if (unlikely((ichan->active_buffer && (ready1 >> chan_id) & 1) ||
1195 (!ichan->active_buffer && (ready0 >> chan_id) & 1)
1196 )) {
1197 spin_unlock(&ichan->lock);
1198 dev_dbg(dev,
1199 "IRQ with active buffer still ready on channel %x, "
1200 "active %d, ready %x, %x!\n", chan_id,
1201 ichan->active_buffer, ready0, ready1);
1202 return IRQ_NONE;
1203 }
1204
1205 if (unlikely(list_empty(&ichan->queue))) {
1206 ichan->sg[ichan->active_buffer] = NULL;
1207 spin_unlock(&ichan->lock);
1208 dev_err(dev,
1209 "IRQ without queued buffers on channel %x, active %d, "
1210 "ready %x, %x!\n", chan_id,
1211 ichan->active_buffer, ready0, ready1);
1212 return IRQ_NONE;
1213 }
1214
1215 /*
1216 * active_buffer is a software flag, it shows which buffer we are
1217 * currently expecting back from the hardware, IDMAC should be
1218 * processing the other buffer already
1219 */
1220 sg = &ichan->sg[ichan->active_buffer];
1221 sgnext = ichan->sg[!ichan->active_buffer];
1222
1223 if (!*sg) {
1224 spin_unlock(&ichan->lock);
1225 return IRQ_HANDLED;
1226 }
1227
1228 desc = list_entry(ichan->queue.next, struct idmac_tx_desc, list);
1229 descnew = desc;
1230
1231 dev_dbg(dev, "IDMAC irq %d, dma %#llx, next dma %#llx, current %d, curbuf %#x\n",
1232 irq, (u64)sg_dma_address(*sg),
1233 sgnext ? (u64)sg_dma_address(sgnext) : 0,
1234 ichan->active_buffer, curbuf);
1235
1236 /* Find the descriptor of sgnext */
1237 sgnew = idmac_sg_next(ichan, &descnew, *sg);
1238 if (sgnext != sgnew)
1239 dev_err(dev, "Submitted buffer %p, next buffer %p\n", sgnext, sgnew);
1240
1241 /*
1242 * if sgnext == NULL sg must be the last element in a scatterlist and
1243 * queue must be empty
1244 */
1245 if (unlikely(!sgnext)) {
1246 if (!WARN_ON(sg_next(*sg)))
1247 dev_dbg(dev, "Underrun on channel %x\n", chan_id);
1248 ichan->sg[!ichan->active_buffer] = sgnew;
1249
1250 if (unlikely(sgnew)) {
1251 ipu_submit_buffer(ichan, descnew, sgnew, !ichan->active_buffer);
1252 } else {
1253 spin_lock(&ipu_data.lock);
1254 ipu_ic_disable_task(&ipu_data, chan_id);
1255 spin_unlock(&ipu_data.lock);
1256 ichan->status = IPU_CHANNEL_READY;
1257 /* Continue to check for complete descriptor */
1258 }
1259 }
1260
1261 /* Calculate and submit the next sg element */
1262 sgnew = idmac_sg_next(ichan, &descnew, sgnew);
1263
1264 if (unlikely(!sg_next(*sg)) || !sgnext) {
1265 /*
1266 * Last element in scatterlist done, remove from the queue,
1267 * _init for debugging
1268 */
1269 list_del_init(&desc->list);
1270 done = true;
1271 }
1272
1273 *sg = sgnew;
1274
1275 if (likely(sgnew) &&
1276 ipu_submit_buffer(ichan, descnew, sgnew, ichan->active_buffer) < 0) {
1277 dmaengine_desc_get_callback(&descnew->txd, &cb);
1278
1279 list_del_init(&descnew->list);
1280 spin_unlock(&ichan->lock);
1281
1282 dmaengine_desc_callback_invoke(&cb, NULL);
1283 spin_lock(&ichan->lock);
1284 }
1285
1286 /* Flip the active buffer - even if update above failed */
1287 ichan->active_buffer = !ichan->active_buffer;
1288 if (done)
1289 dma_cookie_complete(&desc->txd);
1290
1291 dmaengine_desc_get_callback(&desc->txd, &cb);
1292
1293 spin_unlock(&ichan->lock);
1294
1295 if (done && (desc->txd.flags & DMA_PREP_INTERRUPT))
1296 dmaengine_desc_callback_invoke(&cb, NULL);
1297
1298 return IRQ_HANDLED;
1299 }
1300
1301 static void ipu_gc_tasklet(struct tasklet_struct *t)
1302 {
1303 struct ipu *ipu = from_tasklet(ipu, t, tasklet);
1304 int i;
1305
1306 for (i = 0; i < IPU_CHANNELS_NUM; i++) {
1307 struct idmac_channel *ichan = ipu->channel + i;
1308 struct idmac_tx_desc *desc;
1309 unsigned long flags;
1310 struct scatterlist *sg;
1311 int j, k;
1312
1313 for (j = 0; j < ichan->n_tx_desc; j++) {
1314 desc = ichan->desc + j;
1315 spin_lock_irqsave(&ichan->lock, flags);
1316 if (async_tx_test_ack(&desc->txd)) {
1317 list_move(&desc->list, &ichan->free_list);
1318 for_each_sg(desc->sg, sg, desc->sg_len, k) {
1319 if (ichan->sg[0] == sg)
1320 ichan->sg[0] = NULL;
1321 else if (ichan->sg[1] == sg)
1322 ichan->sg[1] = NULL;
1323 }
1324 async_tx_clear_ack(&desc->txd);
1325 }
1326 spin_unlock_irqrestore(&ichan->lock, flags);
1327 }
1328 }
1329 }
1330
1331 /* Allocate and initialise a transfer descriptor. */
1332 static struct dma_async_tx_descriptor *idmac_prep_slave_sg(struct dma_chan *chan,
1333 struct scatterlist *sgl, unsigned int sg_len,
1334 enum dma_transfer_direction direction, unsigned long tx_flags,
1335 void *context)
1336 {
1337 struct idmac_channel *ichan = to_idmac_chan(chan);
1338 struct idmac_tx_desc *desc = NULL;
1339 struct dma_async_tx_descriptor *txd = NULL;
1340 unsigned long flags;
1341
1342 /* We only can handle these three channels so far */
1343 if (chan->chan_id != IDMAC_SDC_0 && chan->chan_id != IDMAC_SDC_1 &&
1344 chan->chan_id != IDMAC_IC_7)
1345 return NULL;
1346
1347 if (!is_slave_direction(direction)) {
1348 dev_err(chan->device->dev, "Invalid DMA direction %d!\n", direction);
1349 return NULL;
1350 }
1351
1352 mutex_lock(&ichan->chan_mutex);
1353
1354 spin_lock_irqsave(&ichan->lock, flags);
1355 if (!list_empty(&ichan->free_list)) {
1356 desc = list_entry(ichan->free_list.next,
1357 struct idmac_tx_desc, list);
1358
1359 list_del_init(&desc->list);
1360
1361 desc->sg_len = sg_len;
1362 desc->sg = sgl;
1363 txd = &desc->txd;
1364 txd->flags = tx_flags;
1365 }
1366 spin_unlock_irqrestore(&ichan->lock, flags);
1367
1368 mutex_unlock(&ichan->chan_mutex);
1369
1370 tasklet_schedule(&to_ipu(to_idmac(chan->device))->tasklet);
1371
1372 return txd;
1373 }
1374
1375 /* Re-select the current buffer and re-activate the channel */
1376 static void idmac_issue_pending(struct dma_chan *chan)
1377 {
1378 struct idmac_channel *ichan = to_idmac_chan(chan);
1379 struct idmac *idmac = to_idmac(chan->device);
1380 struct ipu *ipu = to_ipu(idmac);
1381 unsigned long flags;
1382
1383 /* This is not always needed, but doesn't hurt either */
1384 spin_lock_irqsave(&ipu->lock, flags);
1385 ipu_select_buffer(chan->chan_id, ichan->active_buffer);
1386 spin_unlock_irqrestore(&ipu->lock, flags);
1387
1388 /*
1389 * Might need to perform some parts of initialisation from
1390 * ipu_enable_channel(), but not all, we do not want to reset to buffer
1391 * 0, don't need to set priority again either, but re-enabling the task
1392 * and the channel might be a good idea.
1393 */
1394 }
1395
1396 static int idmac_pause(struct dma_chan *chan)
1397 {
1398 struct idmac_channel *ichan = to_idmac_chan(chan);
1399 struct idmac *idmac = to_idmac(chan->device);
1400 struct ipu *ipu = to_ipu(idmac);
1401 struct list_head *list, *tmp;
1402 unsigned long flags;
1403
1404 mutex_lock(&ichan->chan_mutex);
1405
1406 spin_lock_irqsave(&ipu->lock, flags);
1407 ipu_ic_disable_task(ipu, chan->chan_id);
1408
1409 /* Return all descriptors into "prepared" state */
1410 list_for_each_safe(list, tmp, &ichan->queue)
1411 list_del_init(list);
1412
1413 ichan->sg[0] = NULL;
1414 ichan->sg[1] = NULL;
1415
1416 spin_unlock_irqrestore(&ipu->lock, flags);
1417
1418 ichan->status = IPU_CHANNEL_INITIALIZED;
1419
1420 mutex_unlock(&ichan->chan_mutex);
1421
1422 return 0;
1423 }
1424
1425 static int __idmac_terminate_all(struct dma_chan *chan)
1426 {
1427 struct idmac_channel *ichan = to_idmac_chan(chan);
1428 struct idmac *idmac = to_idmac(chan->device);
1429 struct ipu *ipu = to_ipu(idmac);
1430 unsigned long flags;
1431 int i;
1432
1433 ipu_disable_channel(idmac, ichan,
1434 ichan->status >= IPU_CHANNEL_ENABLED);
1435
1436 tasklet_disable(&ipu->tasklet);
1437
1438 /* ichan->queue is modified in ISR, have to spinlock */
1439 spin_lock_irqsave(&ichan->lock, flags);
1440 list_splice_init(&ichan->queue, &ichan->free_list);
1441
1442 if (ichan->desc)
1443 for (i = 0; i < ichan->n_tx_desc; i++) {
1444 struct idmac_tx_desc *desc = ichan->desc + i;
1445 if (list_empty(&desc->list))
1446 /* Descriptor was prepared, but not submitted */
1447 list_add(&desc->list, &ichan->free_list);
1448
1449 async_tx_clear_ack(&desc->txd);
1450 }
1451
1452 ichan->sg[0] = NULL;
1453 ichan->sg[1] = NULL;
1454 spin_unlock_irqrestore(&ichan->lock, flags);
1455
1456 tasklet_enable(&ipu->tasklet);
1457
1458 ichan->status = IPU_CHANNEL_INITIALIZED;
1459
1460 return 0;
1461 }
1462
1463 static int idmac_terminate_all(struct dma_chan *chan)
1464 {
1465 struct idmac_channel *ichan = to_idmac_chan(chan);
1466 int ret;
1467
1468 mutex_lock(&ichan->chan_mutex);
1469
1470 ret = __idmac_terminate_all(chan);
1471
1472 mutex_unlock(&ichan->chan_mutex);
1473
1474 return ret;
1475 }
1476
1477 #ifdef DEBUG
1478 static irqreturn_t ic_sof_irq(int irq, void *dev_id)
1479 {
1480 struct idmac_channel *ichan = dev_id;
1481 printk(KERN_DEBUG "Got SOF IRQ %d on Channel %d\n",
1482 irq, ichan->dma_chan.chan_id);
1483 disable_irq_nosync(irq);
1484 return IRQ_HANDLED;
1485 }
1486
1487 static irqreturn_t ic_eof_irq(int irq, void *dev_id)
1488 {
1489 struct idmac_channel *ichan = dev_id;
1490 printk(KERN_DEBUG "Got EOF IRQ %d on Channel %d\n",
1491 irq, ichan->dma_chan.chan_id);
1492 disable_irq_nosync(irq);
1493 return IRQ_HANDLED;
1494 }
1495
1496 static int ic_sof = -EINVAL, ic_eof = -EINVAL;
1497 #endif
1498
1499 static int idmac_alloc_chan_resources(struct dma_chan *chan)
1500 {
1501 struct idmac_channel *ichan = to_idmac_chan(chan);
1502 struct idmac *idmac = to_idmac(chan->device);
1503 int ret;
1504
1505 /* dmaengine.c now guarantees to only offer free channels */
1506 BUG_ON(chan->client_count > 1);
1507 WARN_ON(ichan->status != IPU_CHANNEL_FREE);
1508
1509 dma_cookie_init(chan);
1510
1511 ret = ipu_irq_map(chan->chan_id);
1512 if (ret < 0)
1513 goto eimap;
1514
1515 ichan->eof_irq = ret;
1516
1517 /*
1518 * Important to first disable the channel, because maybe someone
1519 * used it before us, e.g., the bootloader
1520 */
1521 ipu_disable_channel(idmac, ichan, true);
1522
1523 ret = ipu_init_channel(idmac, ichan);
1524 if (ret < 0)
1525 goto eichan;
1526
1527 ret = request_irq(ichan->eof_irq, idmac_interrupt, 0,
1528 ichan->eof_name, ichan);
1529 if (ret < 0)
1530 goto erirq;
1531
1532 #ifdef DEBUG
1533 if (chan->chan_id == IDMAC_IC_7) {
1534 ic_sof = ipu_irq_map(69);
1535 if (ic_sof > 0) {
1536 ret = request_irq(ic_sof, ic_sof_irq, 0, "IC SOF", ichan);
1537 if (ret)
1538 dev_err(&chan->dev->device, "request irq failed for IC SOF");
1539 }
1540 ic_eof = ipu_irq_map(70);
1541 if (ic_eof > 0) {
1542 ret = request_irq(ic_eof, ic_eof_irq, 0, "IC EOF", ichan);
1543 if (ret)
1544 dev_err(&chan->dev->device, "request irq failed for IC EOF");
1545 }
1546 }
1547 #endif
1548
1549 ichan->status = IPU_CHANNEL_INITIALIZED;
1550
1551 dev_dbg(&chan->dev->device, "Found channel 0x%x, irq %d\n",
1552 chan->chan_id, ichan->eof_irq);
1553
1554 return ret;
1555
1556 erirq:
1557 ipu_uninit_channel(idmac, ichan);
1558 eichan:
1559 ipu_irq_unmap(chan->chan_id);
1560 eimap:
1561 return ret;
1562 }
1563
1564 static void idmac_free_chan_resources(struct dma_chan *chan)
1565 {
1566 struct idmac_channel *ichan = to_idmac_chan(chan);
1567 struct idmac *idmac = to_idmac(chan->device);
1568
1569 mutex_lock(&ichan->chan_mutex);
1570
1571 __idmac_terminate_all(chan);
1572
1573 if (ichan->status > IPU_CHANNEL_FREE) {
1574 #ifdef DEBUG
1575 if (chan->chan_id == IDMAC_IC_7) {
1576 if (ic_sof > 0) {
1577 free_irq(ic_sof, ichan);
1578 ipu_irq_unmap(69);
1579 ic_sof = -EINVAL;
1580 }
1581 if (ic_eof > 0) {
1582 free_irq(ic_eof, ichan);
1583 ipu_irq_unmap(70);
1584 ic_eof = -EINVAL;
1585 }
1586 }
1587 #endif
1588 free_irq(ichan->eof_irq, ichan);
1589 ipu_irq_unmap(chan->chan_id);
1590 }
1591
1592 ichan->status = IPU_CHANNEL_FREE;
1593
1594 ipu_uninit_channel(idmac, ichan);
1595
1596 mutex_unlock(&ichan->chan_mutex);
1597
1598 tasklet_schedule(&to_ipu(idmac)->tasklet);
1599 }
1600
1601 static enum dma_status idmac_tx_status(struct dma_chan *chan,
1602 dma_cookie_t cookie, struct dma_tx_state *txstate)
1603 {
1604 return dma_cookie_status(chan, cookie, txstate);
1605 }
1606
1607 static int __init ipu_idmac_init(struct ipu *ipu)
1608 {
1609 struct idmac *idmac = &ipu->idmac;
1610 struct dma_device *dma = &idmac->dma;
1611 int i;
1612
1613 dma_cap_set(DMA_SLAVE, dma->cap_mask);
1614 dma_cap_set(DMA_PRIVATE, dma->cap_mask);
1615
1616 /* Compulsory common fields */
1617 dma->dev = ipu->dev;
1618 dma->device_alloc_chan_resources = idmac_alloc_chan_resources;
1619 dma->device_free_chan_resources = idmac_free_chan_resources;
1620 dma->device_tx_status = idmac_tx_status;
1621 dma->device_issue_pending = idmac_issue_pending;
1622
1623 /* Compulsory for DMA_SLAVE fields */
1624 dma->device_prep_slave_sg = idmac_prep_slave_sg;
1625 dma->device_pause = idmac_pause;
1626 dma->device_terminate_all = idmac_terminate_all;
1627
1628 INIT_LIST_HEAD(&dma->channels);
1629 for (i = 0; i < IPU_CHANNELS_NUM; i++) {
1630 struct idmac_channel *ichan = ipu->channel + i;
1631 struct dma_chan *dma_chan = &ichan->dma_chan;
1632
1633 spin_lock_init(&ichan->lock);
1634 mutex_init(&ichan->chan_mutex);
1635
1636 ichan->status = IPU_CHANNEL_FREE;
1637 ichan->sec_chan_en = false;
1638 snprintf(ichan->eof_name, sizeof(ichan->eof_name), "IDMAC EOF %d", i);
1639
1640 dma_chan->device = &idmac->dma;
1641 dma_cookie_init(dma_chan);
1642 dma_chan->chan_id = i;
1643 list_add_tail(&dma_chan->device_node, &dma->channels);
1644 }
1645
1646 idmac_write_icreg(ipu, 0x00000070, IDMAC_CONF);
1647
1648 return dma_async_device_register(&idmac->dma);
1649 }
1650
1651 static void ipu_idmac_exit(struct ipu *ipu)
1652 {
1653 int i;
1654 struct idmac *idmac = &ipu->idmac;
1655
1656 for (i = 0; i < IPU_CHANNELS_NUM; i++) {
1657 struct idmac_channel *ichan = ipu->channel + i;
1658
1659 idmac_terminate_all(&ichan->dma_chan);
1660 }
1661
1662 dma_async_device_unregister(&idmac->dma);
1663 }
1664
1665 /*****************************************************************************
1666 * IPU common probe / remove
1667 */
1668
1669 static int __init ipu_probe(struct platform_device *pdev)
1670 {
1671 struct resource *mem_ipu, *mem_ic;
1672 int ret;
1673
1674 spin_lock_init(&ipu_data.lock);
1675
1676 mem_ipu = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1677 mem_ic = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1678 if (!mem_ipu || !mem_ic)
1679 return -EINVAL;
1680
1681 ipu_data.dev = &pdev->dev;
1682
1683 platform_set_drvdata(pdev, &ipu_data);
1684
1685 ret = platform_get_irq(pdev, 0);
1686 if (ret < 0)
1687 goto err_noirq;
1688
1689 ipu_data.irq_fn = ret;
1690 ret = platform_get_irq(pdev, 1);
1691 if (ret < 0)
1692 goto err_noirq;
1693
1694 ipu_data.irq_err = ret;
1695
1696 dev_dbg(&pdev->dev, "fn irq %u, err irq %u\n",
1697 ipu_data.irq_fn, ipu_data.irq_err);
1698
1699 /* Remap IPU common registers */
1700 ipu_data.reg_ipu = ioremap(mem_ipu->start, resource_size(mem_ipu));
1701 if (!ipu_data.reg_ipu) {
1702 ret = -ENOMEM;
1703 goto err_ioremap_ipu;
1704 }
1705
1706 /* Remap Image Converter and Image DMA Controller registers */
1707 ipu_data.reg_ic = ioremap(mem_ic->start, resource_size(mem_ic));
1708 if (!ipu_data.reg_ic) {
1709 ret = -ENOMEM;
1710 goto err_ioremap_ic;
1711 }
1712
1713 /* Get IPU clock */
1714 ipu_data.ipu_clk = clk_get(&pdev->dev, NULL);
1715 if (IS_ERR(ipu_data.ipu_clk)) {
1716 ret = PTR_ERR(ipu_data.ipu_clk);
1717 goto err_clk_get;
1718 }
1719
1720 /* Make sure IPU HSP clock is running */
1721 clk_prepare_enable(ipu_data.ipu_clk);
1722
1723 /* Disable all interrupts */
1724 idmac_write_ipureg(&ipu_data, 0, IPU_INT_CTRL_1);
1725 idmac_write_ipureg(&ipu_data, 0, IPU_INT_CTRL_2);
1726 idmac_write_ipureg(&ipu_data, 0, IPU_INT_CTRL_3);
1727 idmac_write_ipureg(&ipu_data, 0, IPU_INT_CTRL_4);
1728 idmac_write_ipureg(&ipu_data, 0, IPU_INT_CTRL_5);
1729
1730 dev_dbg(&pdev->dev, "%s @ 0x%08lx, fn irq %u, err irq %u\n", pdev->name,
1731 (unsigned long)mem_ipu->start, ipu_data.irq_fn, ipu_data.irq_err);
1732
1733 ret = ipu_irq_attach_irq(&ipu_data, pdev);
1734 if (ret < 0)
1735 goto err_attach_irq;
1736
1737 /* Initialize DMA engine */
1738 ret = ipu_idmac_init(&ipu_data);
1739 if (ret < 0)
1740 goto err_idmac_init;
1741
1742 tasklet_setup(&ipu_data.tasklet, ipu_gc_tasklet);
1743
1744 ipu_data.dev = &pdev->dev;
1745
1746 dev_dbg(ipu_data.dev, "IPU initialized\n");
1747
1748 return 0;
1749
1750 err_idmac_init:
1751 err_attach_irq:
1752 ipu_irq_detach_irq(&ipu_data, pdev);
1753 clk_disable_unprepare(ipu_data.ipu_clk);
1754 clk_put(ipu_data.ipu_clk);
1755 err_clk_get:
1756 iounmap(ipu_data.reg_ic);
1757 err_ioremap_ic:
1758 iounmap(ipu_data.reg_ipu);
1759 err_ioremap_ipu:
1760 err_noirq:
1761 dev_err(&pdev->dev, "Failed to probe IPU: %d\n", ret);
1762 return ret;
1763 }
1764
1765 static int ipu_remove(struct platform_device *pdev)
1766 {
1767 struct ipu *ipu = platform_get_drvdata(pdev);
1768
1769 ipu_idmac_exit(ipu);
1770 ipu_irq_detach_irq(ipu, pdev);
1771 clk_disable_unprepare(ipu->ipu_clk);
1772 clk_put(ipu->ipu_clk);
1773 iounmap(ipu->reg_ic);
1774 iounmap(ipu->reg_ipu);
1775 tasklet_kill(&ipu->tasklet);
1776
1777 return 0;
1778 }
1779
1780 /*
1781 * We need two MEM resources - with IPU-common and Image Converter registers,
1782 * including PF_CONF and IDMAC_* registers, and two IRQs - function and error
1783 */
1784 static struct platform_driver ipu_platform_driver = {
1785 .driver = {
1786 .name = "ipu-core",
1787 },
1788 .remove = ipu_remove,
1789 };
1790
1791 static int __init ipu_init(void)
1792 {
1793 return platform_driver_probe(&ipu_platform_driver, ipu_probe);
1794 }
1795 subsys_initcall(ipu_init);
1796
1797 MODULE_DESCRIPTION("IPU core driver");
1798 MODULE_LICENSE("GPL v2");
1799 MODULE_AUTHOR("Guennadi Liakhovetski <lg@denx.de>");
1800 MODULE_ALIAS("platform:ipu-core");
Linux with added FPC-III support