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Merge 2.6.38-rc5 into staging-next
[deliverable/linux.git] / drivers / dma / ipu / ipu_idmac.c
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/init.h>
13 #include <linux/platform_device.h>
14 #include <linux/err.h>
15 #include <linux/spinlock.h>
16 #include <linux/delay.h>
17 #include <linux/list.h>
18 #include <linux/clk.h>
19 #include <linux/vmalloc.h>
20 #include <linux/string.h>
21 #include <linux/interrupt.h>
22 #include <linux/io.h>
23
24 #include <mach/ipu.h>
25
26 #include "ipu_intern.h"
27
28 #define FS_VF_IN_VALID 0x00000002
29 #define FS_ENC_IN_VALID 0x00000001
30
31 static int ipu_disable_channel(struct idmac *idmac, struct idmac_channel *ichan,
32 bool wait_for_stop);
33
34 /*
35 * There can be only one, we could allocate it dynamically, but then we'd have
36 * to add an extra parameter to some functions, and use something as ugly as
37 * struct ipu *ipu = to_ipu(to_idmac(ichan->dma_chan.device));
38 * in the ISR
39 */
40 static struct ipu ipu_data;
41
42 #define to_ipu(id) container_of(id, struct ipu, idmac)
43
44 static u32 __idmac_read_icreg(struct ipu *ipu, unsigned long reg)
45 {
46 return __raw_readl(ipu->reg_ic + reg);
47 }
48
49 #define idmac_read_icreg(ipu, reg) __idmac_read_icreg(ipu, reg - IC_CONF)
50
51 static void __idmac_write_icreg(struct ipu *ipu, u32 value, unsigned long reg)
52 {
53 __raw_writel(value, ipu->reg_ic + reg);
54 }
55
56 #define idmac_write_icreg(ipu, v, reg) __idmac_write_icreg(ipu, v, reg - IC_CONF)
57
58 static u32 idmac_read_ipureg(struct ipu *ipu, unsigned long reg)
59 {
60 return __raw_readl(ipu->reg_ipu + reg);
61 }
62
63 static void idmac_write_ipureg(struct ipu *ipu, u32 value, unsigned long reg)
64 {
65 __raw_writel(value, ipu->reg_ipu + reg);
66 }
67
68 /*****************************************************************************
69 * IPU / IC common functions
70 */
71 static void dump_idmac_reg(struct ipu *ipu)
72 {
73 dev_dbg(ipu->dev, "IDMAC_CONF 0x%x, IC_CONF 0x%x, IDMAC_CHA_EN 0x%x, "
74 "IDMAC_CHA_PRI 0x%x, IDMAC_CHA_BUSY 0x%x\n",
75 idmac_read_icreg(ipu, IDMAC_CONF),
76 idmac_read_icreg(ipu, IC_CONF),
77 idmac_read_icreg(ipu, IDMAC_CHA_EN),
78 idmac_read_icreg(ipu, IDMAC_CHA_PRI),
79 idmac_read_icreg(ipu, IDMAC_CHA_BUSY));
80 dev_dbg(ipu->dev, "BUF0_RDY 0x%x, BUF1_RDY 0x%x, CUR_BUF 0x%x, "
81 "DB_MODE 0x%x, TASKS_STAT 0x%x\n",
82 idmac_read_ipureg(ipu, IPU_CHA_BUF0_RDY),
83 idmac_read_ipureg(ipu, IPU_CHA_BUF1_RDY),
84 idmac_read_ipureg(ipu, IPU_CHA_CUR_BUF),
85 idmac_read_ipureg(ipu, IPU_CHA_DB_MODE_SEL),
86 idmac_read_ipureg(ipu, IPU_TASKS_STAT));
87 }
88
89 static uint32_t bytes_per_pixel(enum pixel_fmt fmt)
90 {
91 switch (fmt) {
92 case IPU_PIX_FMT_GENERIC: /* generic data */
93 case IPU_PIX_FMT_RGB332:
94 case IPU_PIX_FMT_YUV420P:
95 case IPU_PIX_FMT_YUV422P:
96 default:
97 return 1;
98 case IPU_PIX_FMT_RGB565:
99 case IPU_PIX_FMT_YUYV:
100 case IPU_PIX_FMT_UYVY:
101 return 2;
102 case IPU_PIX_FMT_BGR24:
103 case IPU_PIX_FMT_RGB24:
104 return 3;
105 case IPU_PIX_FMT_GENERIC_32: /* generic data */
106 case IPU_PIX_FMT_BGR32:
107 case IPU_PIX_FMT_RGB32:
108 case IPU_PIX_FMT_ABGR32:
109 return 4;
110 }
111 }
112
113 /* Enable direct write to memory by the Camera Sensor Interface */
114 static void ipu_ic_enable_task(struct ipu *ipu, enum ipu_channel channel)
115 {
116 uint32_t ic_conf, mask;
117
118 switch (channel) {
119 case IDMAC_IC_0:
120 mask = IC_CONF_PRPENC_EN;
121 break;
122 case IDMAC_IC_7:
123 mask = IC_CONF_RWS_EN | IC_CONF_PRPENC_EN;
124 break;
125 default:
126 return;
127 }
128 ic_conf = idmac_read_icreg(ipu, IC_CONF) | mask;
129 idmac_write_icreg(ipu, ic_conf, IC_CONF);
130 }
131
132 /* Called under spin_lock_irqsave(&ipu_data.lock) */
133 static void ipu_ic_disable_task(struct ipu *ipu, enum ipu_channel channel)
134 {
135 uint32_t ic_conf, mask;
136
137 switch (channel) {
138 case IDMAC_IC_0:
139 mask = IC_CONF_PRPENC_EN;
140 break;
141 case IDMAC_IC_7:
142 mask = IC_CONF_RWS_EN | IC_CONF_PRPENC_EN;
143 break;
144 default:
145 return;
146 }
147 ic_conf = idmac_read_icreg(ipu, IC_CONF) & ~mask;
148 idmac_write_icreg(ipu, ic_conf, IC_CONF);
149 }
150
151 static uint32_t ipu_channel_status(struct ipu *ipu, enum ipu_channel channel)
152 {
153 uint32_t stat = TASK_STAT_IDLE;
154 uint32_t task_stat_reg = idmac_read_ipureg(ipu, IPU_TASKS_STAT);
155
156 switch (channel) {
157 case IDMAC_IC_7:
158 stat = (task_stat_reg & TSTAT_CSI2MEM_MASK) >>
159 TSTAT_CSI2MEM_OFFSET;
160 break;
161 case IDMAC_IC_0:
162 case IDMAC_SDC_0:
163 case IDMAC_SDC_1:
164 default:
165 break;
166 }
167 return stat;
168 }
169
170 struct chan_param_mem_planar {
171 /* Word 0 */
172 u32 xv:10;
173 u32 yv:10;
174 u32 xb:12;
175
176 u32 yb:12;
177 u32 res1:2;
178 u32 nsb:1;
179 u32 lnpb:6;
180 u32 ubo_l:11;
181
182 u32 ubo_h:15;
183 u32 vbo_l:17;
184
185 u32 vbo_h:9;
186 u32 res2:3;
187 u32 fw:12;
188 u32 fh_l:8;
189
190 u32 fh_h:4;
191 u32 res3:28;
192
193 /* Word 1 */
194 u32 eba0;
195
196 u32 eba1;
197
198 u32 bpp:3;
199 u32 sl:14;
200 u32 pfs:3;
201 u32 bam:3;
202 u32 res4:2;
203 u32 npb:6;
204 u32 res5:1;
205
206 u32 sat:2;
207 u32 res6:30;
208 } __attribute__ ((packed));
209
210 struct chan_param_mem_interleaved {
211 /* Word 0 */
212 u32 xv:10;
213 u32 yv:10;
214 u32 xb:12;
215
216 u32 yb:12;
217 u32 sce:1;
218 u32 res1:1;
219 u32 nsb:1;
220 u32 lnpb:6;
221 u32 sx:10;
222 u32 sy_l:1;
223
224 u32 sy_h:9;
225 u32 ns:10;
226 u32 sm:10;
227 u32 sdx_l:3;
228
229 u32 sdx_h:2;
230 u32 sdy:5;
231 u32 sdrx:1;
232 u32 sdry:1;
233 u32 sdr1:1;
234 u32 res2:2;
235 u32 fw:12;
236 u32 fh_l:8;
237
238 u32 fh_h:4;
239 u32 res3:28;
240
241 /* Word 1 */
242 u32 eba0;
243
244 u32 eba1;
245
246 u32 bpp:3;
247 u32 sl:14;
248 u32 pfs:3;
249 u32 bam:3;
250 u32 res4:2;
251 u32 npb:6;
252 u32 res5:1;
253
254 u32 sat:2;
255 u32 scc:1;
256 u32 ofs0:5;
257 u32 ofs1:5;
258 u32 ofs2:5;
259 u32 ofs3:5;
260 u32 wid0:3;
261 u32 wid1:3;
262 u32 wid2:3;
263
264 u32 wid3:3;
265 u32 dec_sel:1;
266 u32 res6:28;
267 } __attribute__ ((packed));
268
269 union chan_param_mem {
270 struct chan_param_mem_planar pp;
271 struct chan_param_mem_interleaved ip;
272 };
273
274 static void ipu_ch_param_set_plane_offset(union chan_param_mem *params,
275 u32 u_offset, u32 v_offset)
276 {
277 params->pp.ubo_l = u_offset & 0x7ff;
278 params->pp.ubo_h = u_offset >> 11;
279 params->pp.vbo_l = v_offset & 0x1ffff;
280 params->pp.vbo_h = v_offset >> 17;
281 }
282
283 static void ipu_ch_param_set_size(union chan_param_mem *params,
284 uint32_t pixel_fmt, uint16_t width,
285 uint16_t height, uint16_t stride)
286 {
287 u32 u_offset;
288 u32 v_offset;
289
290 params->pp.fw = width - 1;
291 params->pp.fh_l = height - 1;
292 params->pp.fh_h = (height - 1) >> 8;
293 params->pp.sl = stride - 1;
294
295 switch (pixel_fmt) {
296 case IPU_PIX_FMT_GENERIC:
297 /*Represents 8-bit Generic data */
298 params->pp.bpp = 3;
299 params->pp.pfs = 7;
300 params->pp.npb = 31;
301 params->pp.sat = 2; /* SAT = use 32-bit access */
302 break;
303 case IPU_PIX_FMT_GENERIC_32:
304 /*Represents 32-bit Generic data */
305 params->pp.bpp = 0;
306 params->pp.pfs = 7;
307 params->pp.npb = 7;
308 params->pp.sat = 2; /* SAT = use 32-bit access */
309 break;
310 case IPU_PIX_FMT_RGB565:
311 params->ip.bpp = 2;
312 params->ip.pfs = 4;
313 params->ip.npb = 7;
314 params->ip.sat = 2; /* SAT = 32-bit access */
315 params->ip.ofs0 = 0; /* Red bit offset */
316 params->ip.ofs1 = 5; /* Green bit offset */
317 params->ip.ofs2 = 11; /* Blue bit offset */
318 params->ip.ofs3 = 16; /* Alpha bit offset */
319 params->ip.wid0 = 4; /* Red bit width - 1 */
320 params->ip.wid1 = 5; /* Green bit width - 1 */
321 params->ip.wid2 = 4; /* Blue bit width - 1 */
322 break;
323 case IPU_PIX_FMT_BGR24:
324 params->ip.bpp = 1; /* 24 BPP & RGB PFS */
325 params->ip.pfs = 4;
326 params->ip.npb = 7;
327 params->ip.sat = 2; /* SAT = 32-bit access */
328 params->ip.ofs0 = 0; /* Red bit offset */
329 params->ip.ofs1 = 8; /* Green bit offset */
330 params->ip.ofs2 = 16; /* Blue bit offset */
331 params->ip.ofs3 = 24; /* Alpha bit offset */
332 params->ip.wid0 = 7; /* Red bit width - 1 */
333 params->ip.wid1 = 7; /* Green bit width - 1 */
334 params->ip.wid2 = 7; /* Blue bit width - 1 */
335 break;
336 case IPU_PIX_FMT_RGB24:
337 params->ip.bpp = 1; /* 24 BPP & RGB PFS */
338 params->ip.pfs = 4;
339 params->ip.npb = 7;
340 params->ip.sat = 2; /* SAT = 32-bit access */
341 params->ip.ofs0 = 16; /* Red bit offset */
342 params->ip.ofs1 = 8; /* Green bit offset */
343 params->ip.ofs2 = 0; /* Blue bit offset */
344 params->ip.ofs3 = 24; /* Alpha bit offset */
345 params->ip.wid0 = 7; /* Red bit width - 1 */
346 params->ip.wid1 = 7; /* Green bit width - 1 */
347 params->ip.wid2 = 7; /* Blue bit width - 1 */
348 break;
349 case IPU_PIX_FMT_BGRA32:
350 case IPU_PIX_FMT_BGR32:
351 case IPU_PIX_FMT_ABGR32:
352 params->ip.bpp = 0;
353 params->ip.pfs = 4;
354 params->ip.npb = 7;
355 params->ip.sat = 2; /* SAT = 32-bit access */
356 params->ip.ofs0 = 8; /* Red bit offset */
357 params->ip.ofs1 = 16; /* Green bit offset */
358 params->ip.ofs2 = 24; /* Blue bit offset */
359 params->ip.ofs3 = 0; /* Alpha bit offset */
360 params->ip.wid0 = 7; /* Red bit width - 1 */
361 params->ip.wid1 = 7; /* Green bit width - 1 */
362 params->ip.wid2 = 7; /* Blue bit width - 1 */
363 params->ip.wid3 = 7; /* Alpha bit width - 1 */
364 break;
365 case IPU_PIX_FMT_RGBA32:
366 case IPU_PIX_FMT_RGB32:
367 params->ip.bpp = 0;
368 params->ip.pfs = 4;
369 params->ip.npb = 7;
370 params->ip.sat = 2; /* SAT = 32-bit access */
371 params->ip.ofs0 = 24; /* Red bit offset */
372 params->ip.ofs1 = 16; /* Green bit offset */
373 params->ip.ofs2 = 8; /* Blue bit offset */
374 params->ip.ofs3 = 0; /* Alpha bit offset */
375 params->ip.wid0 = 7; /* Red bit width - 1 */
376 params->ip.wid1 = 7; /* Green bit width - 1 */
377 params->ip.wid2 = 7; /* Blue bit width - 1 */
378 params->ip.wid3 = 7; /* Alpha bit width - 1 */
379 break;
380 case IPU_PIX_FMT_UYVY:
381 params->ip.bpp = 2;
382 params->ip.pfs = 6;
383 params->ip.npb = 7;
384 params->ip.sat = 2; /* SAT = 32-bit access */
385 break;
386 case IPU_PIX_FMT_YUV420P2:
387 case IPU_PIX_FMT_YUV420P:
388 params->ip.bpp = 3;
389 params->ip.pfs = 3;
390 params->ip.npb = 7;
391 params->ip.sat = 2; /* SAT = 32-bit access */
392 u_offset = stride * height;
393 v_offset = u_offset + u_offset / 4;
394 ipu_ch_param_set_plane_offset(params, u_offset, v_offset);
395 break;
396 case IPU_PIX_FMT_YVU422P:
397 params->ip.bpp = 3;
398 params->ip.pfs = 2;
399 params->ip.npb = 7;
400 params->ip.sat = 2; /* SAT = 32-bit access */
401 v_offset = stride * height;
402 u_offset = v_offset + v_offset / 2;
403 ipu_ch_param_set_plane_offset(params, u_offset, v_offset);
404 break;
405 case IPU_PIX_FMT_YUV422P:
406 params->ip.bpp = 3;
407 params->ip.pfs = 2;
408 params->ip.npb = 7;
409 params->ip.sat = 2; /* SAT = 32-bit access */
410 u_offset = stride * height;
411 v_offset = u_offset + u_offset / 2;
412 ipu_ch_param_set_plane_offset(params, u_offset, v_offset);
413 break;
414 default:
415 dev_err(ipu_data.dev,
416 "mx3 ipu: unimplemented pixel format %d\n", pixel_fmt);
417 break;
418 }
419
420 params->pp.nsb = 1;
421 }
422
423 static void ipu_ch_param_set_burst_size(union chan_param_mem *params,
424 uint16_t burst_pixels)
425 {
426 params->pp.npb = burst_pixels - 1;
427 }
428
429 static void ipu_ch_param_set_buffer(union chan_param_mem *params,
430 dma_addr_t buf0, dma_addr_t buf1)
431 {
432 params->pp.eba0 = buf0;
433 params->pp.eba1 = buf1;
434 }
435
436 static void ipu_ch_param_set_rotation(union chan_param_mem *params,
437 enum ipu_rotate_mode rotate)
438 {
439 params->pp.bam = rotate;
440 }
441
442 static void ipu_write_param_mem(uint32_t addr, uint32_t *data,
443 uint32_t num_words)
444 {
445 for (; num_words > 0; num_words--) {
446 dev_dbg(ipu_data.dev,
447 "write param mem - addr = 0x%08X, data = 0x%08X\n",
448 addr, *data);
449 idmac_write_ipureg(&ipu_data, addr, IPU_IMA_ADDR);
450 idmac_write_ipureg(&ipu_data, *data++, IPU_IMA_DATA);
451 addr++;
452 if ((addr & 0x7) == 5) {
453 addr &= ~0x7; /* set to word 0 */
454 addr += 8; /* increment to next row */
455 }
456 }
457 }
458
459 static int calc_resize_coeffs(uint32_t in_size, uint32_t out_size,
460 uint32_t *resize_coeff,
461 uint32_t *downsize_coeff)
462 {
463 uint32_t temp_size;
464 uint32_t temp_downsize;
465
466 *resize_coeff = 1 << 13;
467 *downsize_coeff = 1 << 13;
468
469 /* Cannot downsize more than 8:1 */
470 if (out_size << 3 < in_size)
471 return -EINVAL;
472
473 /* compute downsizing coefficient */
474 temp_downsize = 0;
475 temp_size = in_size;
476 while (temp_size >= out_size * 2 && temp_downsize < 2) {
477 temp_size >>= 1;
478 temp_downsize++;
479 }
480 *downsize_coeff = temp_downsize;
481
482 /*
483 * compute resizing coefficient using the following formula:
484 * resize_coeff = M*(SI -1)/(SO - 1)
485 * where M = 2^13, SI - input size, SO - output size
486 */
487 *resize_coeff = (8192L * (temp_size - 1)) / (out_size - 1);
488 if (*resize_coeff >= 16384L) {
489 dev_err(ipu_data.dev, "Warning! Overflow on resize coeff.\n");
490 *resize_coeff = 0x3FFF;
491 }
492
493 dev_dbg(ipu_data.dev, "resizing from %u -> %u pixels, "
494 "downsize=%u, resize=%u.%lu (reg=%u)\n", in_size, out_size,
495 *downsize_coeff, *resize_coeff >= 8192L ? 1 : 0,
496 ((*resize_coeff & 0x1FFF) * 10000L) / 8192L, *resize_coeff);
497
498 return 0;
499 }
500
501 static enum ipu_color_space format_to_colorspace(enum pixel_fmt fmt)
502 {
503 switch (fmt) {
504 case IPU_PIX_FMT_RGB565:
505 case IPU_PIX_FMT_BGR24:
506 case IPU_PIX_FMT_RGB24:
507 case IPU_PIX_FMT_BGR32:
508 case IPU_PIX_FMT_RGB32:
509 return IPU_COLORSPACE_RGB;
510 default:
511 return IPU_COLORSPACE_YCBCR;
512 }
513 }
514
515 static int ipu_ic_init_prpenc(struct ipu *ipu,
516 union ipu_channel_param *params, bool src_is_csi)
517 {
518 uint32_t reg, ic_conf;
519 uint32_t downsize_coeff, resize_coeff;
520 enum ipu_color_space in_fmt, out_fmt;
521
522 /* Setup vertical resizing */
523 calc_resize_coeffs(params->video.in_height,
524 params->video.out_height,
525 &resize_coeff, &downsize_coeff);
526 reg = (downsize_coeff << 30) | (resize_coeff << 16);
527
528 /* Setup horizontal resizing */
529 calc_resize_coeffs(params->video.in_width,
530 params->video.out_width,
531 &resize_coeff, &downsize_coeff);
532 reg |= (downsize_coeff << 14) | resize_coeff;
533
534 /* Setup color space conversion */
535 in_fmt = format_to_colorspace(params->video.in_pixel_fmt);
536 out_fmt = format_to_colorspace(params->video.out_pixel_fmt);
537
538 /*
539 * Colourspace conversion unsupported yet - see _init_csc() in
540 * Freescale sources
541 */
542 if (in_fmt != out_fmt) {
543 dev_err(ipu->dev, "Colourspace conversion unsupported!\n");
544 return -EOPNOTSUPP;
545 }
546
547 idmac_write_icreg(ipu, reg, IC_PRP_ENC_RSC);
548
549 ic_conf = idmac_read_icreg(ipu, IC_CONF);
550
551 if (src_is_csi)
552 ic_conf &= ~IC_CONF_RWS_EN;
553 else
554 ic_conf |= IC_CONF_RWS_EN;
555
556 idmac_write_icreg(ipu, ic_conf, IC_CONF);
557
558 return 0;
559 }
560
561 static uint32_t dma_param_addr(uint32_t dma_ch)
562 {
563 /* Channel Parameter Memory */
564 return 0x10000 | (dma_ch << 4);
565 }
566
567 static void ipu_channel_set_priority(struct ipu *ipu, enum ipu_channel channel,
568 bool prio)
569 {
570 u32 reg = idmac_read_icreg(ipu, IDMAC_CHA_PRI);
571
572 if (prio)
573 reg |= 1UL << channel;
574 else
575 reg &= ~(1UL << channel);
576
577 idmac_write_icreg(ipu, reg, IDMAC_CHA_PRI);
578
579 dump_idmac_reg(ipu);
580 }
581
582 static uint32_t ipu_channel_conf_mask(enum ipu_channel channel)
583 {
584 uint32_t mask;
585
586 switch (channel) {
587 case IDMAC_IC_0:
588 case IDMAC_IC_7:
589 mask = IPU_CONF_CSI_EN | IPU_CONF_IC_EN;
590 break;
591 case IDMAC_SDC_0:
592 case IDMAC_SDC_1:
593 mask = IPU_CONF_SDC_EN | IPU_CONF_DI_EN;
594 break;
595 default:
596 mask = 0;
597 break;
598 }
599
600 return mask;
601 }
602
603 /**
604 * ipu_enable_channel() - enable an IPU channel.
605 * @idmac: IPU DMAC context.
606 * @ichan: IDMAC channel.
607 * @return: 0 on success or negative error code on failure.
608 */
609 static int ipu_enable_channel(struct idmac *idmac, struct idmac_channel *ichan)
610 {
611 struct ipu *ipu = to_ipu(idmac);
612 enum ipu_channel channel = ichan->dma_chan.chan_id;
613 uint32_t reg;
614 unsigned long flags;
615
616 spin_lock_irqsave(&ipu->lock, flags);
617
618 /* Reset to buffer 0 */
619 idmac_write_ipureg(ipu, 1UL << channel, IPU_CHA_CUR_BUF);
620 ichan->active_buffer = 0;
621 ichan->status = IPU_CHANNEL_ENABLED;
622
623 switch (channel) {
624 case IDMAC_SDC_0:
625 case IDMAC_SDC_1:
626 case IDMAC_IC_7:
627 ipu_channel_set_priority(ipu, channel, true);
628 default:
629 break;
630 }
631
632 reg = idmac_read_icreg(ipu, IDMAC_CHA_EN);
633
634 idmac_write_icreg(ipu, reg | (1UL << channel), IDMAC_CHA_EN);
635
636 ipu_ic_enable_task(ipu, channel);
637
638 spin_unlock_irqrestore(&ipu->lock, flags);
639 return 0;
640 }
641
642 /**
643 * ipu_init_channel_buffer() - initialize a buffer for logical IPU channel.
644 * @ichan: IDMAC channel.
645 * @pixel_fmt: pixel format of buffer. Pixel format is a FOURCC ASCII code.
646 * @width: width of buffer in pixels.
647 * @height: height of buffer in pixels.
648 * @stride: stride length of buffer in pixels.
649 * @rot_mode: rotation mode of buffer. A rotation setting other than
650 * IPU_ROTATE_VERT_FLIP should only be used for input buffers of
651 * rotation channels.
652 * @phyaddr_0: buffer 0 physical address.
653 * @phyaddr_1: buffer 1 physical address. Setting this to a value other than
654 * NULL enables double buffering mode.
655 * @return: 0 on success or negative error code on failure.
656 */
657 static int ipu_init_channel_buffer(struct idmac_channel *ichan,
658 enum pixel_fmt pixel_fmt,
659 uint16_t width, uint16_t height,
660 uint32_t stride,
661 enum ipu_rotate_mode rot_mode,
662 dma_addr_t phyaddr_0, dma_addr_t phyaddr_1)
663 {
664 enum ipu_channel channel = ichan->dma_chan.chan_id;
665 struct idmac *idmac = to_idmac(ichan->dma_chan.device);
666 struct ipu *ipu = to_ipu(idmac);
667 union chan_param_mem params = {};
668 unsigned long flags;
669 uint32_t reg;
670 uint32_t stride_bytes;
671
672 stride_bytes = stride * bytes_per_pixel(pixel_fmt);
673
674 if (stride_bytes % 4) {
675 dev_err(ipu->dev,
676 "Stride length must be 32-bit aligned, stride = %d, bytes = %d\n",
677 stride, stride_bytes);
678 return -EINVAL;
679 }
680
681 /* IC channel's stride must be a multiple of 8 pixels */
682 if ((channel <= IDMAC_IC_13) && (stride % 8)) {
683 dev_err(ipu->dev, "Stride must be 8 pixel multiple\n");
684 return -EINVAL;
685 }
686
687 /* Build parameter memory data for DMA channel */
688 ipu_ch_param_set_size(&params, pixel_fmt, width, height, stride_bytes);
689 ipu_ch_param_set_buffer(&params, phyaddr_0, phyaddr_1);
690 ipu_ch_param_set_rotation(&params, rot_mode);
691 /* Some channels (rotation) have restriction on burst length */
692 switch (channel) {
693 case IDMAC_IC_7: /* Hangs with burst 8, 16, other values
694 invalid - Table 44-30 */
695 /*
696 ipu_ch_param_set_burst_size(&params, 8);
697 */
698 break;
699 case IDMAC_SDC_0:
700 case IDMAC_SDC_1:
701 /* In original code only IPU_PIX_FMT_RGB565 was setting burst */
702 ipu_ch_param_set_burst_size(&params, 16);
703 break;
704 case IDMAC_IC_0:
705 default:
706 break;
707 }
708
709 spin_lock_irqsave(&ipu->lock, flags);
710
711 ipu_write_param_mem(dma_param_addr(channel), (uint32_t *)&params, 10);
712
713 reg = idmac_read_ipureg(ipu, IPU_CHA_DB_MODE_SEL);
714
715 if (phyaddr_1)
716 reg |= 1UL << channel;
717 else
718 reg &= ~(1UL << channel);
719
720 idmac_write_ipureg(ipu, reg, IPU_CHA_DB_MODE_SEL);
721
722 ichan->status = IPU_CHANNEL_READY;
723
724 spin_unlock_irqrestore(&ipu->lock, flags);
725
726 return 0;
727 }
728
729 /**
730 * ipu_select_buffer() - mark a channel's buffer as ready.
731 * @channel: channel ID.
732 * @buffer_n: buffer number to mark ready.
733 */
734 static void ipu_select_buffer(enum ipu_channel channel, int buffer_n)
735 {
736 /* No locking - this is a write-one-to-set register, cleared by IPU */
737 if (buffer_n == 0)
738 /* Mark buffer 0 as ready. */
739 idmac_write_ipureg(&ipu_data, 1UL << channel, IPU_CHA_BUF0_RDY);
740 else
741 /* Mark buffer 1 as ready. */
742 idmac_write_ipureg(&ipu_data, 1UL << channel, IPU_CHA_BUF1_RDY);
743 }
744
745 /**
746 * ipu_update_channel_buffer() - update physical address of a channel buffer.
747 * @ichan: IDMAC channel.
748 * @buffer_n: buffer number to update.
749 * 0 or 1 are the only valid values.
750 * @phyaddr: buffer physical address.
751 */
752 /* Called under spin_lock(_irqsave)(&ichan->lock) */
753 static void ipu_update_channel_buffer(struct idmac_channel *ichan,
754 int buffer_n, dma_addr_t phyaddr)
755 {
756 enum ipu_channel channel = ichan->dma_chan.chan_id;
757 uint32_t reg;
758 unsigned long flags;
759
760 spin_lock_irqsave(&ipu_data.lock, flags);
761
762 if (buffer_n == 0) {
763 reg = idmac_read_ipureg(&ipu_data, IPU_CHA_BUF0_RDY);
764 if (reg & (1UL << channel)) {
765 ipu_ic_disable_task(&ipu_data, channel);
766 ichan->status = IPU_CHANNEL_READY;
767 }
768
769 /* 44.3.3.1.9 - Row Number 1 (WORD1, offset 0) */
770 idmac_write_ipureg(&ipu_data, dma_param_addr(channel) +
771 0x0008UL, IPU_IMA_ADDR);
772 idmac_write_ipureg(&ipu_data, phyaddr, IPU_IMA_DATA);
773 } else {
774 reg = idmac_read_ipureg(&ipu_data, IPU_CHA_BUF1_RDY);
775 if (reg & (1UL << channel)) {
776 ipu_ic_disable_task(&ipu_data, channel);
777 ichan->status = IPU_CHANNEL_READY;
778 }
779
780 /* Check if double-buffering is already enabled */
781 reg = idmac_read_ipureg(&ipu_data, IPU_CHA_DB_MODE_SEL);
782
783 if (!(reg & (1UL << channel)))
784 idmac_write_ipureg(&ipu_data, reg | (1UL << channel),
785 IPU_CHA_DB_MODE_SEL);
786
787 /* 44.3.3.1.9 - Row Number 1 (WORD1, offset 1) */
788 idmac_write_ipureg(&ipu_data, dma_param_addr(channel) +
789 0x0009UL, IPU_IMA_ADDR);
790 idmac_write_ipureg(&ipu_data, phyaddr, IPU_IMA_DATA);
791 }
792
793 spin_unlock_irqrestore(&ipu_data.lock, flags);
794 }
795
796 /* Called under spin_lock_irqsave(&ichan->lock) */
797 static int ipu_submit_buffer(struct idmac_channel *ichan,
798 struct idmac_tx_desc *desc, struct scatterlist *sg, int buf_idx)
799 {
800 unsigned int chan_id = ichan->dma_chan.chan_id;
801 struct device *dev = &ichan->dma_chan.dev->device;
802
803 if (async_tx_test_ack(&desc->txd))
804 return -EINTR;
805
806 /*
807 * On first invocation this shouldn't be necessary, the call to
808 * ipu_init_channel_buffer() above will set addresses for us, so we
809 * could make it conditional on status >= IPU_CHANNEL_ENABLED, but
810 * doing it again shouldn't hurt either.
811 */
812 ipu_update_channel_buffer(ichan, buf_idx, sg_dma_address(sg));
813
814 ipu_select_buffer(chan_id, buf_idx);
815 dev_dbg(dev, "Updated sg %p on channel 0x%x buffer %d\n",
816 sg, chan_id, buf_idx);
817
818 return 0;
819 }
820
821 /* Called under spin_lock_irqsave(&ichan->lock) */
822 static int ipu_submit_channel_buffers(struct idmac_channel *ichan,
823 struct idmac_tx_desc *desc)
824 {
825 struct scatterlist *sg;
826 int i, ret = 0;
827
828 for (i = 0, sg = desc->sg; i < 2 && sg; i++) {
829 if (!ichan->sg[i]) {
830 ichan->sg[i] = sg;
831
832 ret = ipu_submit_buffer(ichan, desc, sg, i);
833 if (ret < 0)
834 return ret;
835
836 sg = sg_next(sg);
837 }
838 }
839
840 return ret;
841 }
842
843 static dma_cookie_t idmac_tx_submit(struct dma_async_tx_descriptor *tx)
844 {
845 struct idmac_tx_desc *desc = to_tx_desc(tx);
846 struct idmac_channel *ichan = to_idmac_chan(tx->chan);
847 struct idmac *idmac = to_idmac(tx->chan->device);
848 struct ipu *ipu = to_ipu(idmac);
849 struct device *dev = &ichan->dma_chan.dev->device;
850 dma_cookie_t cookie;
851 unsigned long flags;
852 int ret;
853
854 /* Sanity check */
855 if (!list_empty(&desc->list)) {
856 /* The descriptor doesn't belong to client */
857 dev_err(dev, "Descriptor %p not prepared!\n", tx);
858 return -EBUSY;
859 }
860
861 mutex_lock(&ichan->chan_mutex);
862
863 async_tx_clear_ack(tx);
864
865 if (ichan->status < IPU_CHANNEL_READY) {
866 struct idmac_video_param *video = &ichan->params.video;
867 /*
868 * Initial buffer assignment - the first two sg-entries from
869 * the descriptor will end up in the IDMAC buffers
870 */
871 dma_addr_t dma_1 = sg_is_last(desc->sg) ? 0 :
872 sg_dma_address(&desc->sg[1]);
873
874 WARN_ON(ichan->sg[0] || ichan->sg[1]);
875
876 cookie = ipu_init_channel_buffer(ichan,
877 video->out_pixel_fmt,
878 video->out_width,
879 video->out_height,
880 video->out_stride,
881 IPU_ROTATE_NONE,
882 sg_dma_address(&desc->sg[0]),
883 dma_1);
884 if (cookie < 0)
885 goto out;
886 }
887
888 dev_dbg(dev, "Submitting sg %p\n", &desc->sg[0]);
889
890 cookie = ichan->dma_chan.cookie;
891
892 if (++cookie < 0)
893 cookie = 1;
894
895 /* from dmaengine.h: "last cookie value returned to client" */
896 ichan->dma_chan.cookie = cookie;
897 tx->cookie = cookie;
898
899 /* ipu->lock can be taken under ichan->lock, but not v.v. */
900 spin_lock_irqsave(&ichan->lock, flags);
901
902 list_add_tail(&desc->list, &ichan->queue);
903 /* submit_buffers() atomically verifies and fills empty sg slots */
904 ret = ipu_submit_channel_buffers(ichan, desc);
905
906 spin_unlock_irqrestore(&ichan->lock, flags);
907
908 if (ret < 0) {
909 cookie = ret;
910 goto dequeue;
911 }
912
913 if (ichan->status < IPU_CHANNEL_ENABLED) {
914 ret = ipu_enable_channel(idmac, ichan);
915 if (ret < 0) {
916 cookie = ret;
917 goto dequeue;
918 }
919 }
920
921 dump_idmac_reg(ipu);
922
923 dequeue:
924 if (cookie < 0) {
925 spin_lock_irqsave(&ichan->lock, flags);
926 list_del_init(&desc->list);
927 spin_unlock_irqrestore(&ichan->lock, flags);
928 tx->cookie = cookie;
929 ichan->dma_chan.cookie = cookie;
930 }
931
932 out:
933 mutex_unlock(&ichan->chan_mutex);
934
935 return cookie;
936 }
937
938 /* Called with ichan->chan_mutex held */
939 static int idmac_desc_alloc(struct idmac_channel *ichan, int n)
940 {
941 struct idmac_tx_desc *desc = vmalloc(n * sizeof(struct idmac_tx_desc));
942 struct idmac *idmac = to_idmac(ichan->dma_chan.device);
943
944 if (!desc)
945 return -ENOMEM;
946
947 /* No interrupts, just disable the tasklet for a moment */
948 tasklet_disable(&to_ipu(idmac)->tasklet);
949
950 ichan->n_tx_desc = n;
951 ichan->desc = desc;
952 INIT_LIST_HEAD(&ichan->queue);
953 INIT_LIST_HEAD(&ichan->free_list);
954
955 while (n--) {
956 struct dma_async_tx_descriptor *txd = &desc->txd;
957
958 memset(txd, 0, sizeof(*txd));
959 dma_async_tx_descriptor_init(txd, &ichan->dma_chan);
960 txd->tx_submit = idmac_tx_submit;
961
962 list_add(&desc->list, &ichan->free_list);
963
964 desc++;
965 }
966
967 tasklet_enable(&to_ipu(idmac)->tasklet);
968
969 return 0;
970 }
971
972 /**
973 * ipu_init_channel() - initialize an IPU channel.
974 * @idmac: IPU DMAC context.
975 * @ichan: pointer to the channel object.
976 * @return 0 on success or negative error code on failure.
977 */
978 static int ipu_init_channel(struct idmac *idmac, struct idmac_channel *ichan)
979 {
980 union ipu_channel_param *params = &ichan->params;
981 uint32_t ipu_conf;
982 enum ipu_channel channel = ichan->dma_chan.chan_id;
983 unsigned long flags;
984 uint32_t reg;
985 struct ipu *ipu = to_ipu(idmac);
986 int ret = 0, n_desc = 0;
987
988 dev_dbg(ipu->dev, "init channel = %d\n", channel);
989
990 if (channel != IDMAC_SDC_0 && channel != IDMAC_SDC_1 &&
991 channel != IDMAC_IC_7)
992 return -EINVAL;
993
994 spin_lock_irqsave(&ipu->lock, flags);
995
996 switch (channel) {
997 case IDMAC_IC_7:
998 n_desc = 16;
999 reg = idmac_read_icreg(ipu, IC_CONF);
1000 idmac_write_icreg(ipu, reg & ~IC_CONF_CSI_MEM_WR_EN, IC_CONF);
1001 break;
1002 case IDMAC_IC_0:
1003 n_desc = 16;
1004 reg = idmac_read_ipureg(ipu, IPU_FS_PROC_FLOW);
1005 idmac_write_ipureg(ipu, reg & ~FS_ENC_IN_VALID, IPU_FS_PROC_FLOW);
1006 ret = ipu_ic_init_prpenc(ipu, params, true);
1007 break;
1008 case IDMAC_SDC_0:
1009 case IDMAC_SDC_1:
1010 n_desc = 4;
1011 default:
1012 break;
1013 }
1014
1015 ipu->channel_init_mask |= 1L << channel;
1016
1017 /* Enable IPU sub module */
1018 ipu_conf = idmac_read_ipureg(ipu, IPU_CONF) |
1019 ipu_channel_conf_mask(channel);
1020 idmac_write_ipureg(ipu, ipu_conf, IPU_CONF);
1021
1022 spin_unlock_irqrestore(&ipu->lock, flags);
1023
1024 if (n_desc && !ichan->desc)
1025 ret = idmac_desc_alloc(ichan, n_desc);
1026
1027 dump_idmac_reg(ipu);
1028
1029 return ret;
1030 }
1031
1032 /**
1033 * ipu_uninit_channel() - uninitialize an IPU channel.
1034 * @idmac: IPU DMAC context.
1035 * @ichan: pointer to the channel object.
1036 */
1037 static void ipu_uninit_channel(struct idmac *idmac, struct idmac_channel *ichan)
1038 {
1039 enum ipu_channel channel = ichan->dma_chan.chan_id;
1040 unsigned long flags;
1041 uint32_t reg;
1042 unsigned long chan_mask = 1UL << channel;
1043 uint32_t ipu_conf;
1044 struct ipu *ipu = to_ipu(idmac);
1045
1046 spin_lock_irqsave(&ipu->lock, flags);
1047
1048 if (!(ipu->channel_init_mask & chan_mask)) {
1049 dev_err(ipu->dev, "Channel already uninitialized %d\n",
1050 channel);
1051 spin_unlock_irqrestore(&ipu->lock, flags);
1052 return;
1053 }
1054
1055 /* Reset the double buffer */
1056 reg = idmac_read_ipureg(ipu, IPU_CHA_DB_MODE_SEL);
1057 idmac_write_ipureg(ipu, reg & ~chan_mask, IPU_CHA_DB_MODE_SEL);
1058
1059 ichan->sec_chan_en = false;
1060
1061 switch (channel) {
1062 case IDMAC_IC_7:
1063 reg = idmac_read_icreg(ipu, IC_CONF);
1064 idmac_write_icreg(ipu, reg & ~(IC_CONF_RWS_EN | IC_CONF_PRPENC_EN),
1065 IC_CONF);
1066 break;
1067 case IDMAC_IC_0:
1068 reg = idmac_read_icreg(ipu, IC_CONF);
1069 idmac_write_icreg(ipu, reg & ~(IC_CONF_PRPENC_EN | IC_CONF_PRPENC_CSC1),
1070 IC_CONF);
1071 break;
1072 case IDMAC_SDC_0:
1073 case IDMAC_SDC_1:
1074 default:
1075 break;
1076 }
1077
1078 ipu->channel_init_mask &= ~(1L << channel);
1079
1080 ipu_conf = idmac_read_ipureg(ipu, IPU_CONF) &
1081 ~ipu_channel_conf_mask(channel);
1082 idmac_write_ipureg(ipu, ipu_conf, IPU_CONF);
1083
1084 spin_unlock_irqrestore(&ipu->lock, flags);
1085
1086 ichan->n_tx_desc = 0;
1087 vfree(ichan->desc);
1088 ichan->desc = NULL;
1089 }
1090
1091 /**
1092 * ipu_disable_channel() - disable an IPU channel.
1093 * @idmac: IPU DMAC context.
1094 * @ichan: channel object pointer.
1095 * @wait_for_stop: flag to set whether to wait for channel end of frame or
1096 * return immediately.
1097 * @return: 0 on success or negative error code on failure.
1098 */
1099 static int ipu_disable_channel(struct idmac *idmac, struct idmac_channel *ichan,
1100 bool wait_for_stop)
1101 {
1102 enum ipu_channel channel = ichan->dma_chan.chan_id;
1103 struct ipu *ipu = to_ipu(idmac);
1104 uint32_t reg;
1105 unsigned long flags;
1106 unsigned long chan_mask = 1UL << channel;
1107 unsigned int timeout;
1108
1109 if (wait_for_stop && channel != IDMAC_SDC_1 && channel != IDMAC_SDC_0) {
1110 timeout = 40;
1111 /* This waiting always fails. Related to spurious irq problem */
1112 while ((idmac_read_icreg(ipu, IDMAC_CHA_BUSY) & chan_mask) ||
1113 (ipu_channel_status(ipu, channel) == TASK_STAT_ACTIVE)) {
1114 timeout--;
1115 msleep(10);
1116
1117 if (!timeout) {
1118 dev_dbg(ipu->dev,
1119 "Warning: timeout waiting for channel %u to "
1120 "stop: buf0_rdy = 0x%08X, buf1_rdy = 0x%08X, "
1121 "busy = 0x%08X, tstat = 0x%08X\n", channel,
1122 idmac_read_ipureg(ipu, IPU_CHA_BUF0_RDY),
1123 idmac_read_ipureg(ipu, IPU_CHA_BUF1_RDY),
1124 idmac_read_icreg(ipu, IDMAC_CHA_BUSY),
1125 idmac_read_ipureg(ipu, IPU_TASKS_STAT));
1126 break;
1127 }
1128 }
1129 dev_dbg(ipu->dev, "timeout = %d * 10ms\n", 40 - timeout);
1130 }
1131 /* SDC BG and FG must be disabled before DMA is disabled */
1132 if (wait_for_stop && (channel == IDMAC_SDC_0 ||
1133 channel == IDMAC_SDC_1)) {
1134 for (timeout = 5;
1135 timeout && !ipu_irq_status(ichan->eof_irq); timeout--)
1136 msleep(5);
1137 }
1138
1139 spin_lock_irqsave(&ipu->lock, flags);
1140
1141 /* Disable IC task */
1142 ipu_ic_disable_task(ipu, channel);
1143
1144 /* Disable DMA channel(s) */
1145 reg = idmac_read_icreg(ipu, IDMAC_CHA_EN);
1146 idmac_write_icreg(ipu, reg & ~chan_mask, IDMAC_CHA_EN);
1147
1148 spin_unlock_irqrestore(&ipu->lock, flags);
1149
1150 return 0;
1151 }
1152
1153 static struct scatterlist *idmac_sg_next(struct idmac_channel *ichan,
1154 struct idmac_tx_desc **desc, struct scatterlist *sg)
1155 {
1156 struct scatterlist *sgnew = sg ? sg_next(sg) : NULL;
1157
1158 if (sgnew)
1159 /* next sg-element in this list */
1160 return sgnew;
1161
1162 if ((*desc)->list.next == &ichan->queue)
1163 /* No more descriptors on the queue */
1164 return NULL;
1165
1166 /* Fetch next descriptor */
1167 *desc = list_entry((*desc)->list.next, struct idmac_tx_desc, list);
1168 return (*desc)->sg;
1169 }
1170
1171 /*
1172 * We have several possibilities here:
1173 * current BUF next BUF
1174 *
1175 * not last sg next not last sg
1176 * not last sg next last sg
1177 * last sg first sg from next descriptor
1178 * last sg NULL
1179 *
1180 * Besides, the descriptor queue might be empty or not. We process all these
1181 * cases carefully.
1182 */
1183 static irqreturn_t idmac_interrupt(int irq, void *dev_id)
1184 {
1185 struct idmac_channel *ichan = dev_id;
1186 struct device *dev = &ichan->dma_chan.dev->device;
1187 unsigned int chan_id = ichan->dma_chan.chan_id;
1188 struct scatterlist **sg, *sgnext, *sgnew = NULL;
1189 /* Next transfer descriptor */
1190 struct idmac_tx_desc *desc, *descnew;
1191 dma_async_tx_callback callback;
1192 void *callback_param;
1193 bool done = false;
1194 u32 ready0, ready1, curbuf, err;
1195 unsigned long flags;
1196
1197 /* IDMAC has cleared the respective BUFx_RDY bit, we manage the buffer */
1198
1199 dev_dbg(dev, "IDMAC irq %d, buf %d\n", irq, ichan->active_buffer);
1200
1201 spin_lock_irqsave(&ipu_data.lock, flags);
1202
1203 ready0 = idmac_read_ipureg(&ipu_data, IPU_CHA_BUF0_RDY);
1204 ready1 = idmac_read_ipureg(&ipu_data, IPU_CHA_BUF1_RDY);
1205 curbuf = idmac_read_ipureg(&ipu_data, IPU_CHA_CUR_BUF);
1206 err = idmac_read_ipureg(&ipu_data, IPU_INT_STAT_4);
1207
1208 if (err & (1 << chan_id)) {
1209 idmac_write_ipureg(&ipu_data, 1 << chan_id, IPU_INT_STAT_4);
1210 spin_unlock_irqrestore(&ipu_data.lock, flags);
1211 /*
1212 * Doing this
1213 * ichan->sg[0] = ichan->sg[1] = NULL;
1214 * you can force channel re-enable on the next tx_submit(), but
1215 * this is dirty - think about descriptors with multiple
1216 * sg elements.
1217 */
1218 dev_warn(dev, "NFB4EOF on channel %d, ready %x, %x, cur %x\n",
1219 chan_id, ready0, ready1, curbuf);
1220 return IRQ_HANDLED;
1221 }
1222 spin_unlock_irqrestore(&ipu_data.lock, flags);
1223
1224 /* Other interrupts do not interfere with this channel */
1225 spin_lock(&ichan->lock);
1226 if (unlikely((ichan->active_buffer && (ready1 >> chan_id) & 1) ||
1227 (!ichan->active_buffer && (ready0 >> chan_id) & 1)
1228 )) {
1229 spin_unlock(&ichan->lock);
1230 dev_dbg(dev,
1231 "IRQ with active buffer still ready on channel %x, "
1232 "active %d, ready %x, %x!\n", chan_id,
1233 ichan->active_buffer, ready0, ready1);
1234 return IRQ_NONE;
1235 }
1236
1237 if (unlikely(list_empty(&ichan->queue))) {
1238 ichan->sg[ichan->active_buffer] = NULL;
1239 spin_unlock(&ichan->lock);
1240 dev_err(dev,
1241 "IRQ without queued buffers on channel %x, active %d, "
1242 "ready %x, %x!\n", chan_id,
1243 ichan->active_buffer, ready0, ready1);
1244 return IRQ_NONE;
1245 }
1246
1247 /*
1248 * active_buffer is a software flag, it shows which buffer we are
1249 * currently expecting back from the hardware, IDMAC should be
1250 * processing the other buffer already
1251 */
1252 sg = &ichan->sg[ichan->active_buffer];
1253 sgnext = ichan->sg[!ichan->active_buffer];
1254
1255 if (!*sg) {
1256 spin_unlock(&ichan->lock);
1257 return IRQ_HANDLED;
1258 }
1259
1260 desc = list_entry(ichan->queue.next, struct idmac_tx_desc, list);
1261 descnew = desc;
1262
1263 dev_dbg(dev, "IDMAC irq %d, dma 0x%08x, next dma 0x%08x, current %d, curbuf 0x%08x\n",
1264 irq, sg_dma_address(*sg), sgnext ? sg_dma_address(sgnext) : 0, ichan->active_buffer, curbuf);
1265
1266 /* Find the descriptor of sgnext */
1267 sgnew = idmac_sg_next(ichan, &descnew, *sg);
1268 if (sgnext != sgnew)
1269 dev_err(dev, "Submitted buffer %p, next buffer %p\n", sgnext, sgnew);
1270
1271 /*
1272 * if sgnext == NULL sg must be the last element in a scatterlist and
1273 * queue must be empty
1274 */
1275 if (unlikely(!sgnext)) {
1276 if (!WARN_ON(sg_next(*sg)))
1277 dev_dbg(dev, "Underrun on channel %x\n", chan_id);
1278 ichan->sg[!ichan->active_buffer] = sgnew;
1279
1280 if (unlikely(sgnew)) {
1281 ipu_submit_buffer(ichan, descnew, sgnew, !ichan->active_buffer);
1282 } else {
1283 spin_lock_irqsave(&ipu_data.lock, flags);
1284 ipu_ic_disable_task(&ipu_data, chan_id);
1285 spin_unlock_irqrestore(&ipu_data.lock, flags);
1286 ichan->status = IPU_CHANNEL_READY;
1287 /* Continue to check for complete descriptor */
1288 }
1289 }
1290
1291 /* Calculate and submit the next sg element */
1292 sgnew = idmac_sg_next(ichan, &descnew, sgnew);
1293
1294 if (unlikely(!sg_next(*sg)) || !sgnext) {
1295 /*
1296 * Last element in scatterlist done, remove from the queue,
1297 * _init for debugging
1298 */
1299 list_del_init(&desc->list);
1300 done = true;
1301 }
1302
1303 *sg = sgnew;
1304
1305 if (likely(sgnew) &&
1306 ipu_submit_buffer(ichan, descnew, sgnew, ichan->active_buffer) < 0) {
1307 callback = descnew->txd.callback;
1308 callback_param = descnew->txd.callback_param;
1309 spin_unlock(&ichan->lock);
1310 if (callback)
1311 callback(callback_param);
1312 spin_lock(&ichan->lock);
1313 }
1314
1315 /* Flip the active buffer - even if update above failed */
1316 ichan->active_buffer = !ichan->active_buffer;
1317 if (done)
1318 ichan->completed = desc->txd.cookie;
1319
1320 callback = desc->txd.callback;
1321 callback_param = desc->txd.callback_param;
1322
1323 spin_unlock(&ichan->lock);
1324
1325 if (done && (desc->txd.flags & DMA_PREP_INTERRUPT) && callback)
1326 callback(callback_param);
1327
1328 return IRQ_HANDLED;
1329 }
1330
1331 static void ipu_gc_tasklet(unsigned long arg)
1332 {
1333 struct ipu *ipu = (struct ipu *)arg;
1334 int i;
1335
1336 for (i = 0; i < IPU_CHANNELS_NUM; i++) {
1337 struct idmac_channel *ichan = ipu->channel + i;
1338 struct idmac_tx_desc *desc;
1339 unsigned long flags;
1340 struct scatterlist *sg;
1341 int j, k;
1342
1343 for (j = 0; j < ichan->n_tx_desc; j++) {
1344 desc = ichan->desc + j;
1345 spin_lock_irqsave(&ichan->lock, flags);
1346 if (async_tx_test_ack(&desc->txd)) {
1347 list_move(&desc->list, &ichan->free_list);
1348 for_each_sg(desc->sg, sg, desc->sg_len, k) {
1349 if (ichan->sg[0] == sg)
1350 ichan->sg[0] = NULL;
1351 else if (ichan->sg[1] == sg)
1352 ichan->sg[1] = NULL;
1353 }
1354 async_tx_clear_ack(&desc->txd);
1355 }
1356 spin_unlock_irqrestore(&ichan->lock, flags);
1357 }
1358 }
1359 }
1360
1361 /* Allocate and initialise a transfer descriptor. */
1362 static struct dma_async_tx_descriptor *idmac_prep_slave_sg(struct dma_chan *chan,
1363 struct scatterlist *sgl, unsigned int sg_len,
1364 enum dma_data_direction direction, unsigned long tx_flags)
1365 {
1366 struct idmac_channel *ichan = to_idmac_chan(chan);
1367 struct idmac_tx_desc *desc = NULL;
1368 struct dma_async_tx_descriptor *txd = NULL;
1369 unsigned long flags;
1370
1371 /* We only can handle these three channels so far */
1372 if (chan->chan_id != IDMAC_SDC_0 && chan->chan_id != IDMAC_SDC_1 &&
1373 chan->chan_id != IDMAC_IC_7)
1374 return NULL;
1375
1376 if (direction != DMA_FROM_DEVICE && direction != DMA_TO_DEVICE) {
1377 dev_err(chan->device->dev, "Invalid DMA direction %d!\n", direction);
1378 return NULL;
1379 }
1380
1381 mutex_lock(&ichan->chan_mutex);
1382
1383 spin_lock_irqsave(&ichan->lock, flags);
1384 if (!list_empty(&ichan->free_list)) {
1385 desc = list_entry(ichan->free_list.next,
1386 struct idmac_tx_desc, list);
1387
1388 list_del_init(&desc->list);
1389
1390 desc->sg_len = sg_len;
1391 desc->sg = sgl;
1392 txd = &desc->txd;
1393 txd->flags = tx_flags;
1394 }
1395 spin_unlock_irqrestore(&ichan->lock, flags);
1396
1397 mutex_unlock(&ichan->chan_mutex);
1398
1399 tasklet_schedule(&to_ipu(to_idmac(chan->device))->tasklet);
1400
1401 return txd;
1402 }
1403
1404 /* Re-select the current buffer and re-activate the channel */
1405 static void idmac_issue_pending(struct dma_chan *chan)
1406 {
1407 struct idmac_channel *ichan = to_idmac_chan(chan);
1408 struct idmac *idmac = to_idmac(chan->device);
1409 struct ipu *ipu = to_ipu(idmac);
1410 unsigned long flags;
1411
1412 /* This is not always needed, but doesn't hurt either */
1413 spin_lock_irqsave(&ipu->lock, flags);
1414 ipu_select_buffer(chan->chan_id, ichan->active_buffer);
1415 spin_unlock_irqrestore(&ipu->lock, flags);
1416
1417 /*
1418 * Might need to perform some parts of initialisation from
1419 * ipu_enable_channel(), but not all, we do not want to reset to buffer
1420 * 0, don't need to set priority again either, but re-enabling the task
1421 * and the channel might be a good idea.
1422 */
1423 }
1424
1425 static int __idmac_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
1426 unsigned long arg)
1427 {
1428 struct idmac_channel *ichan = to_idmac_chan(chan);
1429 struct idmac *idmac = to_idmac(chan->device);
1430 unsigned long flags;
1431 int i;
1432
1433 /* Only supports DMA_TERMINATE_ALL */
1434 if (cmd != DMA_TERMINATE_ALL)
1435 return -ENXIO;
1436
1437 ipu_disable_channel(idmac, ichan,
1438 ichan->status >= IPU_CHANNEL_ENABLED);
1439
1440 tasklet_disable(&to_ipu(idmac)->tasklet);
1441
1442 /* ichan->queue is modified in ISR, have to spinlock */
1443 spin_lock_irqsave(&ichan->lock, flags);
1444 list_splice_init(&ichan->queue, &ichan->free_list);
1445
1446 if (ichan->desc)
1447 for (i = 0; i < ichan->n_tx_desc; i++) {
1448 struct idmac_tx_desc *desc = ichan->desc + i;
1449 if (list_empty(&desc->list))
1450 /* Descriptor was prepared, but not submitted */
1451 list_add(&desc->list, &ichan->free_list);
1452
1453 async_tx_clear_ack(&desc->txd);
1454 }
1455
1456 ichan->sg[0] = NULL;
1457 ichan->sg[1] = NULL;
1458 spin_unlock_irqrestore(&ichan->lock, flags);
1459
1460 tasklet_enable(&to_ipu(idmac)->tasklet);
1461
1462 ichan->status = IPU_CHANNEL_INITIALIZED;
1463
1464 return 0;
1465 }
1466
1467 static int idmac_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
1468 unsigned long arg)
1469 {
1470 struct idmac_channel *ichan = to_idmac_chan(chan);
1471 int ret;
1472
1473 mutex_lock(&ichan->chan_mutex);
1474
1475 ret = __idmac_control(chan, cmd, arg);
1476
1477 mutex_unlock(&ichan->chan_mutex);
1478
1479 return ret;
1480 }
1481
1482 #ifdef DEBUG
1483 static irqreturn_t ic_sof_irq(int irq, void *dev_id)
1484 {
1485 struct idmac_channel *ichan = dev_id;
1486 printk(KERN_DEBUG "Got SOF IRQ %d on Channel %d\n",
1487 irq, ichan->dma_chan.chan_id);
1488 disable_irq_nosync(irq);
1489 return IRQ_HANDLED;
1490 }
1491
1492 static irqreturn_t ic_eof_irq(int irq, void *dev_id)
1493 {
1494 struct idmac_channel *ichan = dev_id;
1495 printk(KERN_DEBUG "Got EOF IRQ %d on Channel %d\n",
1496 irq, ichan->dma_chan.chan_id);
1497 disable_irq_nosync(irq);
1498 return IRQ_HANDLED;
1499 }
1500
1501 static int ic_sof = -EINVAL, ic_eof = -EINVAL;
1502 #endif
1503
1504 static int idmac_alloc_chan_resources(struct dma_chan *chan)
1505 {
1506 struct idmac_channel *ichan = to_idmac_chan(chan);
1507 struct idmac *idmac = to_idmac(chan->device);
1508 int ret;
1509
1510 /* dmaengine.c now guarantees to only offer free channels */
1511 BUG_ON(chan->client_count > 1);
1512 WARN_ON(ichan->status != IPU_CHANNEL_FREE);
1513
1514 chan->cookie = 1;
1515 ichan->completed = -ENXIO;
1516
1517 ret = ipu_irq_map(chan->chan_id);
1518 if (ret < 0)
1519 goto eimap;
1520
1521 ichan->eof_irq = ret;
1522
1523 /*
1524 * Important to first disable the channel, because maybe someone
1525 * used it before us, e.g., the bootloader
1526 */
1527 ipu_disable_channel(idmac, ichan, true);
1528
1529 ret = ipu_init_channel(idmac, ichan);
1530 if (ret < 0)
1531 goto eichan;
1532
1533 ret = request_irq(ichan->eof_irq, idmac_interrupt, 0,
1534 ichan->eof_name, ichan);
1535 if (ret < 0)
1536 goto erirq;
1537
1538 #ifdef DEBUG
1539 if (chan->chan_id == IDMAC_IC_7) {
1540 ic_sof = ipu_irq_map(69);
1541 if (ic_sof > 0)
1542 request_irq(ic_sof, ic_sof_irq, 0, "IC SOF", ichan);
1543 ic_eof = ipu_irq_map(70);
1544 if (ic_eof > 0)
1545 request_irq(ic_eof, ic_eof_irq, 0, "IC EOF", ichan);
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_control(chan, DMA_TERMINATE_ALL, 0);
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 struct idmac_channel *ichan = to_idmac_chan(chan);
1605
1606 dma_set_tx_state(txstate, ichan->completed, chan->cookie, 0);
1607 if (cookie != chan->cookie)
1608 return DMA_ERROR;
1609 return DMA_SUCCESS;
1610 }
1611
1612 static int __init ipu_idmac_init(struct ipu *ipu)
1613 {
1614 struct idmac *idmac = &ipu->idmac;
1615 struct dma_device *dma = &idmac->dma;
1616 int i;
1617
1618 dma_cap_set(DMA_SLAVE, dma->cap_mask);
1619 dma_cap_set(DMA_PRIVATE, dma->cap_mask);
1620
1621 /* Compulsory common fields */
1622 dma->dev = ipu->dev;
1623 dma->device_alloc_chan_resources = idmac_alloc_chan_resources;
1624 dma->device_free_chan_resources = idmac_free_chan_resources;
1625 dma->device_tx_status = idmac_tx_status;
1626 dma->device_issue_pending = idmac_issue_pending;
1627
1628 /* Compulsory for DMA_SLAVE fields */
1629 dma->device_prep_slave_sg = idmac_prep_slave_sg;
1630 dma->device_control = idmac_control;
1631
1632 INIT_LIST_HEAD(&dma->channels);
1633 for (i = 0; i < IPU_CHANNELS_NUM; i++) {
1634 struct idmac_channel *ichan = ipu->channel + i;
1635 struct dma_chan *dma_chan = &ichan->dma_chan;
1636
1637 spin_lock_init(&ichan->lock);
1638 mutex_init(&ichan->chan_mutex);
1639
1640 ichan->status = IPU_CHANNEL_FREE;
1641 ichan->sec_chan_en = false;
1642 ichan->completed = -ENXIO;
1643 snprintf(ichan->eof_name, sizeof(ichan->eof_name), "IDMAC EOF %d", i);
1644
1645 dma_chan->device = &idmac->dma;
1646 dma_chan->cookie = 1;
1647 dma_chan->chan_id = i;
1648 list_add_tail(&dma_chan->device_node, &dma->channels);
1649 }
1650
1651 idmac_write_icreg(ipu, 0x00000070, IDMAC_CONF);
1652
1653 return dma_async_device_register(&idmac->dma);
1654 }
1655
1656 static void __exit ipu_idmac_exit(struct ipu *ipu)
1657 {
1658 int i;
1659 struct idmac *idmac = &ipu->idmac;
1660
1661 for (i = 0; i < IPU_CHANNELS_NUM; i++) {
1662 struct idmac_channel *ichan = ipu->channel + i;
1663
1664 idmac_control(&ichan->dma_chan, DMA_TERMINATE_ALL, 0);
1665 idmac_prep_slave_sg(&ichan->dma_chan, NULL, 0, DMA_NONE, 0);
1666 }
1667
1668 dma_async_device_unregister(&idmac->dma);
1669 }
1670
1671 /*****************************************************************************
1672 * IPU common probe / remove
1673 */
1674
1675 static int __init ipu_probe(struct platform_device *pdev)
1676 {
1677 struct ipu_platform_data *pdata = pdev->dev.platform_data;
1678 struct resource *mem_ipu, *mem_ic;
1679 int ret;
1680
1681 spin_lock_init(&ipu_data.lock);
1682
1683 mem_ipu = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1684 mem_ic = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1685 if (!pdata || !mem_ipu || !mem_ic)
1686 return -EINVAL;
1687
1688 ipu_data.dev = &pdev->dev;
1689
1690 platform_set_drvdata(pdev, &ipu_data);
1691
1692 ret = platform_get_irq(pdev, 0);
1693 if (ret < 0)
1694 goto err_noirq;
1695
1696 ipu_data.irq_fn = ret;
1697 ret = platform_get_irq(pdev, 1);
1698 if (ret < 0)
1699 goto err_noirq;
1700
1701 ipu_data.irq_err = ret;
1702 ipu_data.irq_base = pdata->irq_base;
1703
1704 dev_dbg(&pdev->dev, "fn irq %u, err irq %u, irq-base %u\n",
1705 ipu_data.irq_fn, ipu_data.irq_err, ipu_data.irq_base);
1706
1707 /* Remap IPU common registers */
1708 ipu_data.reg_ipu = ioremap(mem_ipu->start,
1709 mem_ipu->end - mem_ipu->start + 1);
1710 if (!ipu_data.reg_ipu) {
1711 ret = -ENOMEM;
1712 goto err_ioremap_ipu;
1713 }
1714
1715 /* Remap Image Converter and Image DMA Controller registers */
1716 ipu_data.reg_ic = ioremap(mem_ic->start,
1717 mem_ic->end - mem_ic->start + 1);
1718 if (!ipu_data.reg_ic) {
1719 ret = -ENOMEM;
1720 goto err_ioremap_ic;
1721 }
1722
1723 /* Get IPU clock */
1724 ipu_data.ipu_clk = clk_get(&pdev->dev, NULL);
1725 if (IS_ERR(ipu_data.ipu_clk)) {
1726 ret = PTR_ERR(ipu_data.ipu_clk);
1727 goto err_clk_get;
1728 }
1729
1730 /* Make sure IPU HSP clock is running */
1731 clk_enable(ipu_data.ipu_clk);
1732
1733 /* Disable all interrupts */
1734 idmac_write_ipureg(&ipu_data, 0, IPU_INT_CTRL_1);
1735 idmac_write_ipureg(&ipu_data, 0, IPU_INT_CTRL_2);
1736 idmac_write_ipureg(&ipu_data, 0, IPU_INT_CTRL_3);
1737 idmac_write_ipureg(&ipu_data, 0, IPU_INT_CTRL_4);
1738 idmac_write_ipureg(&ipu_data, 0, IPU_INT_CTRL_5);
1739
1740 dev_dbg(&pdev->dev, "%s @ 0x%08lx, fn irq %u, err irq %u\n", pdev->name,
1741 (unsigned long)mem_ipu->start, ipu_data.irq_fn, ipu_data.irq_err);
1742
1743 ret = ipu_irq_attach_irq(&ipu_data, pdev);
1744 if (ret < 0)
1745 goto err_attach_irq;
1746
1747 /* Initialize DMA engine */
1748 ret = ipu_idmac_init(&ipu_data);
1749 if (ret < 0)
1750 goto err_idmac_init;
1751
1752 tasklet_init(&ipu_data.tasklet, ipu_gc_tasklet, (unsigned long)&ipu_data);
1753
1754 ipu_data.dev = &pdev->dev;
1755
1756 dev_dbg(ipu_data.dev, "IPU initialized\n");
1757
1758 return 0;
1759
1760 err_idmac_init:
1761 err_attach_irq:
1762 ipu_irq_detach_irq(&ipu_data, pdev);
1763 clk_disable(ipu_data.ipu_clk);
1764 clk_put(ipu_data.ipu_clk);
1765 err_clk_get:
1766 iounmap(ipu_data.reg_ic);
1767 err_ioremap_ic:
1768 iounmap(ipu_data.reg_ipu);
1769 err_ioremap_ipu:
1770 err_noirq:
1771 dev_err(&pdev->dev, "Failed to probe IPU: %d\n", ret);
1772 return ret;
1773 }
1774
1775 static int __exit ipu_remove(struct platform_device *pdev)
1776 {
1777 struct ipu *ipu = platform_get_drvdata(pdev);
1778
1779 ipu_idmac_exit(ipu);
1780 ipu_irq_detach_irq(ipu, pdev);
1781 clk_disable(ipu->ipu_clk);
1782 clk_put(ipu->ipu_clk);
1783 iounmap(ipu->reg_ic);
1784 iounmap(ipu->reg_ipu);
1785 tasklet_kill(&ipu->tasklet);
1786 platform_set_drvdata(pdev, NULL);
1787
1788 return 0;
1789 }
1790
1791 /*
1792 * We need two MEM resources - with IPU-common and Image Converter registers,
1793 * including PF_CONF and IDMAC_* registers, and two IRQs - function and error
1794 */
1795 static struct platform_driver ipu_platform_driver = {
1796 .driver = {
1797 .name = "ipu-core",
1798 .owner = THIS_MODULE,
1799 },
1800 .remove = __exit_p(ipu_remove),
1801 };
1802
1803 static int __init ipu_init(void)
1804 {
1805 return platform_driver_probe(&ipu_platform_driver, ipu_probe);
1806 }
1807 subsys_initcall(ipu_init);
1808
1809 MODULE_DESCRIPTION("IPU core driver");
1810 MODULE_LICENSE("GPL v2");
1811 MODULE_AUTHOR("Guennadi Liakhovetski <lg@denx.de>");
1812 MODULE_ALIAS("platform:ipu-core");
Linux kernel - Deliverables
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