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Merge git://git.kvack.org/~bcrl/aio-next
[deliverable/linux.git] / arch / arm / plat-omap / dma.c
1 /*
2 * linux/arch/arm/plat-omap/dma.c
3 *
4 * Copyright (C) 2003 - 2008 Nokia Corporation
5 * Author: Juha Yrjölä <juha.yrjola@nokia.com>
6 * DMA channel linking for 1610 by Samuel Ortiz <samuel.ortiz@nokia.com>
7 * Graphics DMA and LCD DMA graphics tranformations
8 * by Imre Deak <imre.deak@nokia.com>
9 * OMAP2/3 support Copyright (C) 2004-2007 Texas Instruments, Inc.
10 * Merged to support both OMAP1 and OMAP2 by Tony Lindgren <tony@atomide.com>
11 * Some functions based on earlier dma-omap.c Copyright (C) 2001 RidgeRun, Inc.
12 *
13 * Copyright (C) 2009 Texas Instruments
14 * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
15 *
16 * Support functions for the OMAP internal DMA channels.
17 *
18 * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
19 * Converted DMA library into DMA platform driver.
20 * - G, Manjunath Kondaiah <manjugk@ti.com>
21 *
22 * This program is free software; you can redistribute it and/or modify
23 * it under the terms of the GNU General Public License version 2 as
24 * published by the Free Software Foundation.
25 *
26 */
27
28 #include <linux/module.h>
29 #include <linux/init.h>
30 #include <linux/sched.h>
31 #include <linux/spinlock.h>
32 #include <linux/errno.h>
33 #include <linux/interrupt.h>
34 #include <linux/irq.h>
35 #include <linux/io.h>
36 #include <linux/slab.h>
37 #include <linux/delay.h>
38
39 #include <linux/omap-dma.h>
40
41 /*
42 * MAX_LOGICAL_DMA_CH_COUNT: the maximum number of logical DMA
43 * channels that an instance of the SDMA IP block can support. Used
44 * to size arrays. (The actual maximum on a particular SoC may be less
45 * than this -- for example, OMAP1 SDMA instances only support 17 logical
46 * DMA channels.)
47 */
48 #define MAX_LOGICAL_DMA_CH_COUNT 32
49
50 #undef DEBUG
51
52 #ifndef CONFIG_ARCH_OMAP1
53 enum { DMA_CH_ALLOC_DONE, DMA_CH_PARAMS_SET_DONE, DMA_CH_STARTED,
54 DMA_CH_QUEUED, DMA_CH_NOTSTARTED, DMA_CH_PAUSED, DMA_CH_LINK_ENABLED
55 };
56
57 enum { DMA_CHAIN_STARTED, DMA_CHAIN_NOTSTARTED };
58 #endif
59
60 #define OMAP_DMA_ACTIVE 0x01
61 #define OMAP2_DMA_CSR_CLEAR_MASK 0xffffffff
62
63 #define OMAP_FUNC_MUX_ARM_BASE (0xfffe1000 + 0xec)
64
65 static struct omap_system_dma_plat_info *p;
66 static struct omap_dma_dev_attr *d;
67
68 static int enable_1510_mode;
69 static u32 errata;
70
71 static struct omap_dma_global_context_registers {
72 u32 dma_irqenable_l0;
73 u32 dma_ocp_sysconfig;
74 u32 dma_gcr;
75 } omap_dma_global_context;
76
77 struct dma_link_info {
78 int *linked_dmach_q;
79 int no_of_lchs_linked;
80
81 int q_count;
82 int q_tail;
83 int q_head;
84
85 int chain_state;
86 int chain_mode;
87
88 };
89
90 static struct dma_link_info *dma_linked_lch;
91
92 #ifndef CONFIG_ARCH_OMAP1
93
94 /* Chain handling macros */
95 #define OMAP_DMA_CHAIN_QINIT(chain_id) \
96 do { \
97 dma_linked_lch[chain_id].q_head = \
98 dma_linked_lch[chain_id].q_tail = \
99 dma_linked_lch[chain_id].q_count = 0; \
100 } while (0)
101 #define OMAP_DMA_CHAIN_QFULL(chain_id) \
102 (dma_linked_lch[chain_id].no_of_lchs_linked == \
103 dma_linked_lch[chain_id].q_count)
104 #define OMAP_DMA_CHAIN_QLAST(chain_id) \
105 do { \
106 ((dma_linked_lch[chain_id].no_of_lchs_linked-1) == \
107 dma_linked_lch[chain_id].q_count) \
108 } while (0)
109 #define OMAP_DMA_CHAIN_QEMPTY(chain_id) \
110 (0 == dma_linked_lch[chain_id].q_count)
111 #define __OMAP_DMA_CHAIN_INCQ(end) \
112 ((end) = ((end)+1) % dma_linked_lch[chain_id].no_of_lchs_linked)
113 #define OMAP_DMA_CHAIN_INCQHEAD(chain_id) \
114 do { \
115 __OMAP_DMA_CHAIN_INCQ(dma_linked_lch[chain_id].q_head); \
116 dma_linked_lch[chain_id].q_count--; \
117 } while (0)
118
119 #define OMAP_DMA_CHAIN_INCQTAIL(chain_id) \
120 do { \
121 __OMAP_DMA_CHAIN_INCQ(dma_linked_lch[chain_id].q_tail); \
122 dma_linked_lch[chain_id].q_count++; \
123 } while (0)
124 #endif
125
126 static int dma_lch_count;
127 static int dma_chan_count;
128 static int omap_dma_reserve_channels;
129
130 static spinlock_t dma_chan_lock;
131 static struct omap_dma_lch *dma_chan;
132
133 static inline void disable_lnk(int lch);
134 static void omap_disable_channel_irq(int lch);
135 static inline void omap_enable_channel_irq(int lch);
136
137 #define REVISIT_24XX() printk(KERN_ERR "FIXME: no %s on 24xx\n", \
138 __func__);
139
140 #ifdef CONFIG_ARCH_OMAP15XX
141 /* Returns 1 if the DMA module is in OMAP1510-compatible mode, 0 otherwise */
142 static int omap_dma_in_1510_mode(void)
143 {
144 return enable_1510_mode;
145 }
146 #else
147 #define omap_dma_in_1510_mode() 0
148 #endif
149
150 #ifdef CONFIG_ARCH_OMAP1
151 static inline int get_gdma_dev(int req)
152 {
153 u32 reg = OMAP_FUNC_MUX_ARM_BASE + ((req - 1) / 5) * 4;
154 int shift = ((req - 1) % 5) * 6;
155
156 return ((omap_readl(reg) >> shift) & 0x3f) + 1;
157 }
158
159 static inline void set_gdma_dev(int req, int dev)
160 {
161 u32 reg = OMAP_FUNC_MUX_ARM_BASE + ((req - 1) / 5) * 4;
162 int shift = ((req - 1) % 5) * 6;
163 u32 l;
164
165 l = omap_readl(reg);
166 l &= ~(0x3f << shift);
167 l |= (dev - 1) << shift;
168 omap_writel(l, reg);
169 }
170 #else
171 #define set_gdma_dev(req, dev) do {} while (0)
172 #define omap_readl(reg) 0
173 #define omap_writel(val, reg) do {} while (0)
174 #endif
175
176 #ifdef CONFIG_ARCH_OMAP1
177 void omap_set_dma_priority(int lch, int dst_port, int priority)
178 {
179 unsigned long reg;
180 u32 l;
181
182 if (dma_omap1()) {
183 switch (dst_port) {
184 case OMAP_DMA_PORT_OCP_T1: /* FFFECC00 */
185 reg = OMAP_TC_OCPT1_PRIOR;
186 break;
187 case OMAP_DMA_PORT_OCP_T2: /* FFFECCD0 */
188 reg = OMAP_TC_OCPT2_PRIOR;
189 break;
190 case OMAP_DMA_PORT_EMIFF: /* FFFECC08 */
191 reg = OMAP_TC_EMIFF_PRIOR;
192 break;
193 case OMAP_DMA_PORT_EMIFS: /* FFFECC04 */
194 reg = OMAP_TC_EMIFS_PRIOR;
195 break;
196 default:
197 BUG();
198 return;
199 }
200 l = omap_readl(reg);
201 l &= ~(0xf << 8);
202 l |= (priority & 0xf) << 8;
203 omap_writel(l, reg);
204 }
205 }
206 #endif
207
208 #ifdef CONFIG_ARCH_OMAP2PLUS
209 void omap_set_dma_priority(int lch, int dst_port, int priority)
210 {
211 u32 ccr;
212
213 ccr = p->dma_read(CCR, lch);
214 if (priority)
215 ccr |= (1 << 6);
216 else
217 ccr &= ~(1 << 6);
218 p->dma_write(ccr, CCR, lch);
219 }
220 #endif
221 EXPORT_SYMBOL(omap_set_dma_priority);
222
223 void omap_set_dma_transfer_params(int lch, int data_type, int elem_count,
224 int frame_count, int sync_mode,
225 int dma_trigger, int src_or_dst_synch)
226 {
227 u32 l;
228
229 l = p->dma_read(CSDP, lch);
230 l &= ~0x03;
231 l |= data_type;
232 p->dma_write(l, CSDP, lch);
233
234 if (dma_omap1()) {
235 u16 ccr;
236
237 ccr = p->dma_read(CCR, lch);
238 ccr &= ~(1 << 5);
239 if (sync_mode == OMAP_DMA_SYNC_FRAME)
240 ccr |= 1 << 5;
241 p->dma_write(ccr, CCR, lch);
242
243 ccr = p->dma_read(CCR2, lch);
244 ccr &= ~(1 << 2);
245 if (sync_mode == OMAP_DMA_SYNC_BLOCK)
246 ccr |= 1 << 2;
247 p->dma_write(ccr, CCR2, lch);
248 }
249
250 if (dma_omap2plus() && dma_trigger) {
251 u32 val;
252
253 val = p->dma_read(CCR, lch);
254
255 /* DMA_SYNCHRO_CONTROL_UPPER depends on the channel number */
256 val &= ~((1 << 23) | (3 << 19) | 0x1f);
257 val |= (dma_trigger & ~0x1f) << 14;
258 val |= dma_trigger & 0x1f;
259
260 if (sync_mode & OMAP_DMA_SYNC_FRAME)
261 val |= 1 << 5;
262 else
263 val &= ~(1 << 5);
264
265 if (sync_mode & OMAP_DMA_SYNC_BLOCK)
266 val |= 1 << 18;
267 else
268 val &= ~(1 << 18);
269
270 if (src_or_dst_synch == OMAP_DMA_DST_SYNC_PREFETCH) {
271 val &= ~(1 << 24); /* dest synch */
272 val |= (1 << 23); /* Prefetch */
273 } else if (src_or_dst_synch) {
274 val |= 1 << 24; /* source synch */
275 } else {
276 val &= ~(1 << 24); /* dest synch */
277 }
278 p->dma_write(val, CCR, lch);
279 }
280
281 p->dma_write(elem_count, CEN, lch);
282 p->dma_write(frame_count, CFN, lch);
283 }
284 EXPORT_SYMBOL(omap_set_dma_transfer_params);
285
286 void omap_set_dma_color_mode(int lch, enum omap_dma_color_mode mode, u32 color)
287 {
288 BUG_ON(omap_dma_in_1510_mode());
289
290 if (dma_omap1()) {
291 u16 w;
292
293 w = p->dma_read(CCR2, lch);
294 w &= ~0x03;
295
296 switch (mode) {
297 case OMAP_DMA_CONSTANT_FILL:
298 w |= 0x01;
299 break;
300 case OMAP_DMA_TRANSPARENT_COPY:
301 w |= 0x02;
302 break;
303 case OMAP_DMA_COLOR_DIS:
304 break;
305 default:
306 BUG();
307 }
308 p->dma_write(w, CCR2, lch);
309
310 w = p->dma_read(LCH_CTRL, lch);
311 w &= ~0x0f;
312 /* Default is channel type 2D */
313 if (mode) {
314 p->dma_write(color, COLOR, lch);
315 w |= 1; /* Channel type G */
316 }
317 p->dma_write(w, LCH_CTRL, lch);
318 }
319
320 if (dma_omap2plus()) {
321 u32 val;
322
323 val = p->dma_read(CCR, lch);
324 val &= ~((1 << 17) | (1 << 16));
325
326 switch (mode) {
327 case OMAP_DMA_CONSTANT_FILL:
328 val |= 1 << 16;
329 break;
330 case OMAP_DMA_TRANSPARENT_COPY:
331 val |= 1 << 17;
332 break;
333 case OMAP_DMA_COLOR_DIS:
334 break;
335 default:
336 BUG();
337 }
338 p->dma_write(val, CCR, lch);
339
340 color &= 0xffffff;
341 p->dma_write(color, COLOR, lch);
342 }
343 }
344 EXPORT_SYMBOL(omap_set_dma_color_mode);
345
346 void omap_set_dma_write_mode(int lch, enum omap_dma_write_mode mode)
347 {
348 if (dma_omap2plus()) {
349 u32 csdp;
350
351 csdp = p->dma_read(CSDP, lch);
352 csdp &= ~(0x3 << 16);
353 csdp |= (mode << 16);
354 p->dma_write(csdp, CSDP, lch);
355 }
356 }
357 EXPORT_SYMBOL(omap_set_dma_write_mode);
358
359 void omap_set_dma_channel_mode(int lch, enum omap_dma_channel_mode mode)
360 {
361 if (dma_omap1() && !dma_omap15xx()) {
362 u32 l;
363
364 l = p->dma_read(LCH_CTRL, lch);
365 l &= ~0x7;
366 l |= mode;
367 p->dma_write(l, LCH_CTRL, lch);
368 }
369 }
370 EXPORT_SYMBOL(omap_set_dma_channel_mode);
371
372 /* Note that src_port is only for omap1 */
373 void omap_set_dma_src_params(int lch, int src_port, int src_amode,
374 unsigned long src_start,
375 int src_ei, int src_fi)
376 {
377 u32 l;
378
379 if (dma_omap1()) {
380 u16 w;
381
382 w = p->dma_read(CSDP, lch);
383 w &= ~(0x1f << 2);
384 w |= src_port << 2;
385 p->dma_write(w, CSDP, lch);
386 }
387
388 l = p->dma_read(CCR, lch);
389 l &= ~(0x03 << 12);
390 l |= src_amode << 12;
391 p->dma_write(l, CCR, lch);
392
393 p->dma_write(src_start, CSSA, lch);
394
395 p->dma_write(src_ei, CSEI, lch);
396 p->dma_write(src_fi, CSFI, lch);
397 }
398 EXPORT_SYMBOL(omap_set_dma_src_params);
399
400 void omap_set_dma_params(int lch, struct omap_dma_channel_params *params)
401 {
402 omap_set_dma_transfer_params(lch, params->data_type,
403 params->elem_count, params->frame_count,
404 params->sync_mode, params->trigger,
405 params->src_or_dst_synch);
406 omap_set_dma_src_params(lch, params->src_port,
407 params->src_amode, params->src_start,
408 params->src_ei, params->src_fi);
409
410 omap_set_dma_dest_params(lch, params->dst_port,
411 params->dst_amode, params->dst_start,
412 params->dst_ei, params->dst_fi);
413 if (params->read_prio || params->write_prio)
414 omap_dma_set_prio_lch(lch, params->read_prio,
415 params->write_prio);
416 }
417 EXPORT_SYMBOL(omap_set_dma_params);
418
419 void omap_set_dma_src_index(int lch, int eidx, int fidx)
420 {
421 if (dma_omap2plus())
422 return;
423
424 p->dma_write(eidx, CSEI, lch);
425 p->dma_write(fidx, CSFI, lch);
426 }
427 EXPORT_SYMBOL(omap_set_dma_src_index);
428
429 void omap_set_dma_src_data_pack(int lch, int enable)
430 {
431 u32 l;
432
433 l = p->dma_read(CSDP, lch);
434 l &= ~(1 << 6);
435 if (enable)
436 l |= (1 << 6);
437 p->dma_write(l, CSDP, lch);
438 }
439 EXPORT_SYMBOL(omap_set_dma_src_data_pack);
440
441 void omap_set_dma_src_burst_mode(int lch, enum omap_dma_burst_mode burst_mode)
442 {
443 unsigned int burst = 0;
444 u32 l;
445
446 l = p->dma_read(CSDP, lch);
447 l &= ~(0x03 << 7);
448
449 switch (burst_mode) {
450 case OMAP_DMA_DATA_BURST_DIS:
451 break;
452 case OMAP_DMA_DATA_BURST_4:
453 if (dma_omap2plus())
454 burst = 0x1;
455 else
456 burst = 0x2;
457 break;
458 case OMAP_DMA_DATA_BURST_8:
459 if (dma_omap2plus()) {
460 burst = 0x2;
461 break;
462 }
463 /*
464 * not supported by current hardware on OMAP1
465 * w |= (0x03 << 7);
466 * fall through
467 */
468 case OMAP_DMA_DATA_BURST_16:
469 if (dma_omap2plus()) {
470 burst = 0x3;
471 break;
472 }
473 /*
474 * OMAP1 don't support burst 16
475 * fall through
476 */
477 default:
478 BUG();
479 }
480
481 l |= (burst << 7);
482 p->dma_write(l, CSDP, lch);
483 }
484 EXPORT_SYMBOL(omap_set_dma_src_burst_mode);
485
486 /* Note that dest_port is only for OMAP1 */
487 void omap_set_dma_dest_params(int lch, int dest_port, int dest_amode,
488 unsigned long dest_start,
489 int dst_ei, int dst_fi)
490 {
491 u32 l;
492
493 if (dma_omap1()) {
494 l = p->dma_read(CSDP, lch);
495 l &= ~(0x1f << 9);
496 l |= dest_port << 9;
497 p->dma_write(l, CSDP, lch);
498 }
499
500 l = p->dma_read(CCR, lch);
501 l &= ~(0x03 << 14);
502 l |= dest_amode << 14;
503 p->dma_write(l, CCR, lch);
504
505 p->dma_write(dest_start, CDSA, lch);
506
507 p->dma_write(dst_ei, CDEI, lch);
508 p->dma_write(dst_fi, CDFI, lch);
509 }
510 EXPORT_SYMBOL(omap_set_dma_dest_params);
511
512 void omap_set_dma_dest_index(int lch, int eidx, int fidx)
513 {
514 if (dma_omap2plus())
515 return;
516
517 p->dma_write(eidx, CDEI, lch);
518 p->dma_write(fidx, CDFI, lch);
519 }
520 EXPORT_SYMBOL(omap_set_dma_dest_index);
521
522 void omap_set_dma_dest_data_pack(int lch, int enable)
523 {
524 u32 l;
525
526 l = p->dma_read(CSDP, lch);
527 l &= ~(1 << 13);
528 if (enable)
529 l |= 1 << 13;
530 p->dma_write(l, CSDP, lch);
531 }
532 EXPORT_SYMBOL(omap_set_dma_dest_data_pack);
533
534 void omap_set_dma_dest_burst_mode(int lch, enum omap_dma_burst_mode burst_mode)
535 {
536 unsigned int burst = 0;
537 u32 l;
538
539 l = p->dma_read(CSDP, lch);
540 l &= ~(0x03 << 14);
541
542 switch (burst_mode) {
543 case OMAP_DMA_DATA_BURST_DIS:
544 break;
545 case OMAP_DMA_DATA_BURST_4:
546 if (dma_omap2plus())
547 burst = 0x1;
548 else
549 burst = 0x2;
550 break;
551 case OMAP_DMA_DATA_BURST_8:
552 if (dma_omap2plus())
553 burst = 0x2;
554 else
555 burst = 0x3;
556 break;
557 case OMAP_DMA_DATA_BURST_16:
558 if (dma_omap2plus()) {
559 burst = 0x3;
560 break;
561 }
562 /*
563 * OMAP1 don't support burst 16
564 * fall through
565 */
566 default:
567 printk(KERN_ERR "Invalid DMA burst mode\n");
568 BUG();
569 return;
570 }
571 l |= (burst << 14);
572 p->dma_write(l, CSDP, lch);
573 }
574 EXPORT_SYMBOL(omap_set_dma_dest_burst_mode);
575
576 static inline void omap_enable_channel_irq(int lch)
577 {
578 /* Clear CSR */
579 if (dma_omap1())
580 p->dma_read(CSR, lch);
581 else
582 p->dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR, lch);
583
584 /* Enable some nice interrupts. */
585 p->dma_write(dma_chan[lch].enabled_irqs, CICR, lch);
586 }
587
588 static inline void omap_disable_channel_irq(int lch)
589 {
590 /* disable channel interrupts */
591 p->dma_write(0, CICR, lch);
592 /* Clear CSR */
593 if (dma_omap1())
594 p->dma_read(CSR, lch);
595 else
596 p->dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR, lch);
597 }
598
599 void omap_enable_dma_irq(int lch, u16 bits)
600 {
601 dma_chan[lch].enabled_irqs |= bits;
602 }
603 EXPORT_SYMBOL(omap_enable_dma_irq);
604
605 void omap_disable_dma_irq(int lch, u16 bits)
606 {
607 dma_chan[lch].enabled_irqs &= ~bits;
608 }
609 EXPORT_SYMBOL(omap_disable_dma_irq);
610
611 static inline void enable_lnk(int lch)
612 {
613 u32 l;
614
615 l = p->dma_read(CLNK_CTRL, lch);
616
617 if (dma_omap1())
618 l &= ~(1 << 14);
619
620 /* Set the ENABLE_LNK bits */
621 if (dma_chan[lch].next_lch != -1)
622 l = dma_chan[lch].next_lch | (1 << 15);
623
624 #ifndef CONFIG_ARCH_OMAP1
625 if (dma_omap2plus())
626 if (dma_chan[lch].next_linked_ch != -1)
627 l = dma_chan[lch].next_linked_ch | (1 << 15);
628 #endif
629
630 p->dma_write(l, CLNK_CTRL, lch);
631 }
632
633 static inline void disable_lnk(int lch)
634 {
635 u32 l;
636
637 l = p->dma_read(CLNK_CTRL, lch);
638
639 /* Disable interrupts */
640 omap_disable_channel_irq(lch);
641
642 if (dma_omap1()) {
643 /* Set the STOP_LNK bit */
644 l |= 1 << 14;
645 }
646
647 if (dma_omap2plus()) {
648 /* Clear the ENABLE_LNK bit */
649 l &= ~(1 << 15);
650 }
651
652 p->dma_write(l, CLNK_CTRL, lch);
653 dma_chan[lch].flags &= ~OMAP_DMA_ACTIVE;
654 }
655
656 static inline void omap2_enable_irq_lch(int lch)
657 {
658 u32 val;
659 unsigned long flags;
660
661 if (dma_omap1())
662 return;
663
664 spin_lock_irqsave(&dma_chan_lock, flags);
665 /* clear IRQ STATUS */
666 p->dma_write(1 << lch, IRQSTATUS_L0, lch);
667 /* Enable interrupt */
668 val = p->dma_read(IRQENABLE_L0, lch);
669 val |= 1 << lch;
670 p->dma_write(val, IRQENABLE_L0, lch);
671 spin_unlock_irqrestore(&dma_chan_lock, flags);
672 }
673
674 static inline void omap2_disable_irq_lch(int lch)
675 {
676 u32 val;
677 unsigned long flags;
678
679 if (dma_omap1())
680 return;
681
682 spin_lock_irqsave(&dma_chan_lock, flags);
683 /* Disable interrupt */
684 val = p->dma_read(IRQENABLE_L0, lch);
685 val &= ~(1 << lch);
686 p->dma_write(val, IRQENABLE_L0, lch);
687 /* clear IRQ STATUS */
688 p->dma_write(1 << lch, IRQSTATUS_L0, lch);
689 spin_unlock_irqrestore(&dma_chan_lock, flags);
690 }
691
692 int omap_request_dma(int dev_id, const char *dev_name,
693 void (*callback)(int lch, u16 ch_status, void *data),
694 void *data, int *dma_ch_out)
695 {
696 int ch, free_ch = -1;
697 unsigned long flags;
698 struct omap_dma_lch *chan;
699
700 spin_lock_irqsave(&dma_chan_lock, flags);
701 for (ch = 0; ch < dma_chan_count; ch++) {
702 if (free_ch == -1 && dma_chan[ch].dev_id == -1) {
703 free_ch = ch;
704 /* Exit after first free channel found */
705 break;
706 }
707 }
708 if (free_ch == -1) {
709 spin_unlock_irqrestore(&dma_chan_lock, flags);
710 return -EBUSY;
711 }
712 chan = dma_chan + free_ch;
713 chan->dev_id = dev_id;
714
715 if (p->clear_lch_regs)
716 p->clear_lch_regs(free_ch);
717
718 if (dma_omap2plus())
719 omap_clear_dma(free_ch);
720
721 spin_unlock_irqrestore(&dma_chan_lock, flags);
722
723 chan->dev_name = dev_name;
724 chan->callback = callback;
725 chan->data = data;
726 chan->flags = 0;
727
728 #ifndef CONFIG_ARCH_OMAP1
729 if (dma_omap2plus()) {
730 chan->chain_id = -1;
731 chan->next_linked_ch = -1;
732 }
733 #endif
734
735 chan->enabled_irqs = OMAP_DMA_DROP_IRQ | OMAP_DMA_BLOCK_IRQ;
736
737 if (dma_omap1())
738 chan->enabled_irqs |= OMAP1_DMA_TOUT_IRQ;
739 else if (dma_omap2plus())
740 chan->enabled_irqs |= OMAP2_DMA_MISALIGNED_ERR_IRQ |
741 OMAP2_DMA_TRANS_ERR_IRQ;
742
743 if (dma_omap16xx()) {
744 /* If the sync device is set, configure it dynamically. */
745 if (dev_id != 0) {
746 set_gdma_dev(free_ch + 1, dev_id);
747 dev_id = free_ch + 1;
748 }
749 /*
750 * Disable the 1510 compatibility mode and set the sync device
751 * id.
752 */
753 p->dma_write(dev_id | (1 << 10), CCR, free_ch);
754 } else if (dma_omap1()) {
755 p->dma_write(dev_id, CCR, free_ch);
756 }
757
758 if (dma_omap2plus()) {
759 omap_enable_channel_irq(free_ch);
760 omap2_enable_irq_lch(free_ch);
761 }
762
763 *dma_ch_out = free_ch;
764
765 return 0;
766 }
767 EXPORT_SYMBOL(omap_request_dma);
768
769 void omap_free_dma(int lch)
770 {
771 unsigned long flags;
772
773 if (dma_chan[lch].dev_id == -1) {
774 pr_err("omap_dma: trying to free unallocated DMA channel %d\n",
775 lch);
776 return;
777 }
778
779 /* Disable interrupt for logical channel */
780 if (dma_omap2plus())
781 omap2_disable_irq_lch(lch);
782
783 /* Disable all DMA interrupts for the channel. */
784 omap_disable_channel_irq(lch);
785
786 /* Make sure the DMA transfer is stopped. */
787 p->dma_write(0, CCR, lch);
788
789 /* Clear registers */
790 if (dma_omap2plus())
791 omap_clear_dma(lch);
792
793 spin_lock_irqsave(&dma_chan_lock, flags);
794 dma_chan[lch].dev_id = -1;
795 dma_chan[lch].next_lch = -1;
796 dma_chan[lch].callback = NULL;
797 spin_unlock_irqrestore(&dma_chan_lock, flags);
798 }
799 EXPORT_SYMBOL(omap_free_dma);
800
801 /**
802 * @brief omap_dma_set_global_params : Set global priority settings for dma
803 *
804 * @param arb_rate
805 * @param max_fifo_depth
806 * @param tparams - Number of threads to reserve : DMA_THREAD_RESERVE_NORM
807 * DMA_THREAD_RESERVE_ONET
808 * DMA_THREAD_RESERVE_TWOT
809 * DMA_THREAD_RESERVE_THREET
810 */
811 void
812 omap_dma_set_global_params(int arb_rate, int max_fifo_depth, int tparams)
813 {
814 u32 reg;
815
816 if (dma_omap1()) {
817 printk(KERN_ERR "FIXME: no %s on 15xx/16xx\n", __func__);
818 return;
819 }
820
821 if (max_fifo_depth == 0)
822 max_fifo_depth = 1;
823 if (arb_rate == 0)
824 arb_rate = 1;
825
826 reg = 0xff & max_fifo_depth;
827 reg |= (0x3 & tparams) << 12;
828 reg |= (arb_rate & 0xff) << 16;
829
830 p->dma_write(reg, GCR, 0);
831 }
832 EXPORT_SYMBOL(omap_dma_set_global_params);
833
834 /**
835 * @brief omap_dma_set_prio_lch : Set channel wise priority settings
836 *
837 * @param lch
838 * @param read_prio - Read priority
839 * @param write_prio - Write priority
840 * Both of the above can be set with one of the following values :
841 * DMA_CH_PRIO_HIGH/DMA_CH_PRIO_LOW
842 */
843 int
844 omap_dma_set_prio_lch(int lch, unsigned char read_prio,
845 unsigned char write_prio)
846 {
847 u32 l;
848
849 if (unlikely((lch < 0 || lch >= dma_lch_count))) {
850 printk(KERN_ERR "Invalid channel id\n");
851 return -EINVAL;
852 }
853 l = p->dma_read(CCR, lch);
854 l &= ~((1 << 6) | (1 << 26));
855 if (d->dev_caps & IS_RW_PRIORITY)
856 l |= ((read_prio & 0x1) << 6) | ((write_prio & 0x1) << 26);
857 else
858 l |= ((read_prio & 0x1) << 6);
859
860 p->dma_write(l, CCR, lch);
861
862 return 0;
863 }
864 EXPORT_SYMBOL(omap_dma_set_prio_lch);
865
866 /*
867 * Clears any DMA state so the DMA engine is ready to restart with new buffers
868 * through omap_start_dma(). Any buffers in flight are discarded.
869 */
870 void omap_clear_dma(int lch)
871 {
872 unsigned long flags;
873
874 local_irq_save(flags);
875 p->clear_dma(lch);
876 local_irq_restore(flags);
877 }
878 EXPORT_SYMBOL(omap_clear_dma);
879
880 void omap_start_dma(int lch)
881 {
882 u32 l;
883
884 /*
885 * The CPC/CDAC register needs to be initialized to zero
886 * before starting dma transfer.
887 */
888 if (dma_omap15xx())
889 p->dma_write(0, CPC, lch);
890 else
891 p->dma_write(0, CDAC, lch);
892
893 if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) {
894 int next_lch, cur_lch;
895 char dma_chan_link_map[MAX_LOGICAL_DMA_CH_COUNT];
896
897 /* Set the link register of the first channel */
898 enable_lnk(lch);
899
900 memset(dma_chan_link_map, 0, sizeof(dma_chan_link_map));
901 dma_chan_link_map[lch] = 1;
902
903 cur_lch = dma_chan[lch].next_lch;
904 do {
905 next_lch = dma_chan[cur_lch].next_lch;
906
907 /* The loop case: we've been here already */
908 if (dma_chan_link_map[cur_lch])
909 break;
910 /* Mark the current channel */
911 dma_chan_link_map[cur_lch] = 1;
912
913 enable_lnk(cur_lch);
914 omap_enable_channel_irq(cur_lch);
915
916 cur_lch = next_lch;
917 } while (next_lch != -1);
918 } else if (IS_DMA_ERRATA(DMA_ERRATA_PARALLEL_CHANNELS))
919 p->dma_write(lch, CLNK_CTRL, lch);
920
921 omap_enable_channel_irq(lch);
922
923 l = p->dma_read(CCR, lch);
924
925 if (IS_DMA_ERRATA(DMA_ERRATA_IFRAME_BUFFERING))
926 l |= OMAP_DMA_CCR_BUFFERING_DISABLE;
927 l |= OMAP_DMA_CCR_EN;
928
929 /*
930 * As dma_write() uses IO accessors which are weakly ordered, there
931 * is no guarantee that data in coherent DMA memory will be visible
932 * to the DMA device. Add a memory barrier here to ensure that any
933 * such data is visible prior to enabling DMA.
934 */
935 mb();
936 p->dma_write(l, CCR, lch);
937
938 dma_chan[lch].flags |= OMAP_DMA_ACTIVE;
939 }
940 EXPORT_SYMBOL(omap_start_dma);
941
942 void omap_stop_dma(int lch)
943 {
944 u32 l;
945
946 /* Disable all interrupts on the channel */
947 omap_disable_channel_irq(lch);
948
949 l = p->dma_read(CCR, lch);
950 if (IS_DMA_ERRATA(DMA_ERRATA_i541) &&
951 (l & OMAP_DMA_CCR_SEL_SRC_DST_SYNC)) {
952 int i = 0;
953 u32 sys_cf;
954
955 /* Configure No-Standby */
956 l = p->dma_read(OCP_SYSCONFIG, lch);
957 sys_cf = l;
958 l &= ~DMA_SYSCONFIG_MIDLEMODE_MASK;
959 l |= DMA_SYSCONFIG_MIDLEMODE(DMA_IDLEMODE_NO_IDLE);
960 p->dma_write(l , OCP_SYSCONFIG, 0);
961
962 l = p->dma_read(CCR, lch);
963 l &= ~OMAP_DMA_CCR_EN;
964 p->dma_write(l, CCR, lch);
965
966 /* Wait for sDMA FIFO drain */
967 l = p->dma_read(CCR, lch);
968 while (i < 100 && (l & (OMAP_DMA_CCR_RD_ACTIVE |
969 OMAP_DMA_CCR_WR_ACTIVE))) {
970 udelay(5);
971 i++;
972 l = p->dma_read(CCR, lch);
973 }
974 if (i >= 100)
975 pr_err("DMA drain did not complete on lch %d\n", lch);
976 /* Restore OCP_SYSCONFIG */
977 p->dma_write(sys_cf, OCP_SYSCONFIG, lch);
978 } else {
979 l &= ~OMAP_DMA_CCR_EN;
980 p->dma_write(l, CCR, lch);
981 }
982
983 /*
984 * Ensure that data transferred by DMA is visible to any access
985 * after DMA has been disabled. This is important for coherent
986 * DMA regions.
987 */
988 mb();
989
990 if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) {
991 int next_lch, cur_lch = lch;
992 char dma_chan_link_map[MAX_LOGICAL_DMA_CH_COUNT];
993
994 memset(dma_chan_link_map, 0, sizeof(dma_chan_link_map));
995 do {
996 /* The loop case: we've been here already */
997 if (dma_chan_link_map[cur_lch])
998 break;
999 /* Mark the current channel */
1000 dma_chan_link_map[cur_lch] = 1;
1001
1002 disable_lnk(cur_lch);
1003
1004 next_lch = dma_chan[cur_lch].next_lch;
1005 cur_lch = next_lch;
1006 } while (next_lch != -1);
1007 }
1008
1009 dma_chan[lch].flags &= ~OMAP_DMA_ACTIVE;
1010 }
1011 EXPORT_SYMBOL(omap_stop_dma);
1012
1013 /*
1014 * Allows changing the DMA callback function or data. This may be needed if
1015 * the driver shares a single DMA channel for multiple dma triggers.
1016 */
1017 int omap_set_dma_callback(int lch,
1018 void (*callback)(int lch, u16 ch_status, void *data),
1019 void *data)
1020 {
1021 unsigned long flags;
1022
1023 if (lch < 0)
1024 return -ENODEV;
1025
1026 spin_lock_irqsave(&dma_chan_lock, flags);
1027 if (dma_chan[lch].dev_id == -1) {
1028 printk(KERN_ERR "DMA callback for not set for free channel\n");
1029 spin_unlock_irqrestore(&dma_chan_lock, flags);
1030 return -EINVAL;
1031 }
1032 dma_chan[lch].callback = callback;
1033 dma_chan[lch].data = data;
1034 spin_unlock_irqrestore(&dma_chan_lock, flags);
1035
1036 return 0;
1037 }
1038 EXPORT_SYMBOL(omap_set_dma_callback);
1039
1040 /*
1041 * Returns current physical source address for the given DMA channel.
1042 * If the channel is running the caller must disable interrupts prior calling
1043 * this function and process the returned value before re-enabling interrupt to
1044 * prevent races with the interrupt handler. Note that in continuous mode there
1045 * is a chance for CSSA_L register overflow between the two reads resulting
1046 * in incorrect return value.
1047 */
1048 dma_addr_t omap_get_dma_src_pos(int lch)
1049 {
1050 dma_addr_t offset = 0;
1051
1052 if (dma_omap15xx())
1053 offset = p->dma_read(CPC, lch);
1054 else
1055 offset = p->dma_read(CSAC, lch);
1056
1057 if (IS_DMA_ERRATA(DMA_ERRATA_3_3) && offset == 0)
1058 offset = p->dma_read(CSAC, lch);
1059
1060 if (!dma_omap15xx()) {
1061 /*
1062 * CDAC == 0 indicates that the DMA transfer on the channel has
1063 * not been started (no data has been transferred so far).
1064 * Return the programmed source start address in this case.
1065 */
1066 if (likely(p->dma_read(CDAC, lch)))
1067 offset = p->dma_read(CSAC, lch);
1068 else
1069 offset = p->dma_read(CSSA, lch);
1070 }
1071
1072 if (dma_omap1())
1073 offset |= (p->dma_read(CSSA, lch) & 0xFFFF0000);
1074
1075 return offset;
1076 }
1077 EXPORT_SYMBOL(omap_get_dma_src_pos);
1078
1079 /*
1080 * Returns current physical destination address for the given DMA channel.
1081 * If the channel is running the caller must disable interrupts prior calling
1082 * this function and process the returned value before re-enabling interrupt to
1083 * prevent races with the interrupt handler. Note that in continuous mode there
1084 * is a chance for CDSA_L register overflow between the two reads resulting
1085 * in incorrect return value.
1086 */
1087 dma_addr_t omap_get_dma_dst_pos(int lch)
1088 {
1089 dma_addr_t offset = 0;
1090
1091 if (dma_omap15xx())
1092 offset = p->dma_read(CPC, lch);
1093 else
1094 offset = p->dma_read(CDAC, lch);
1095
1096 /*
1097 * omap 3.2/3.3 erratum: sometimes 0 is returned if CSAC/CDAC is
1098 * read before the DMA controller finished disabling the channel.
1099 */
1100 if (!dma_omap15xx() && offset == 0) {
1101 offset = p->dma_read(CDAC, lch);
1102 /*
1103 * CDAC == 0 indicates that the DMA transfer on the channel has
1104 * not been started (no data has been transferred so far).
1105 * Return the programmed destination start address in this case.
1106 */
1107 if (unlikely(!offset))
1108 offset = p->dma_read(CDSA, lch);
1109 }
1110
1111 if (dma_omap1())
1112 offset |= (p->dma_read(CDSA, lch) & 0xFFFF0000);
1113
1114 return offset;
1115 }
1116 EXPORT_SYMBOL(omap_get_dma_dst_pos);
1117
1118 int omap_get_dma_active_status(int lch)
1119 {
1120 return (p->dma_read(CCR, lch) & OMAP_DMA_CCR_EN) != 0;
1121 }
1122 EXPORT_SYMBOL(omap_get_dma_active_status);
1123
1124 int omap_dma_running(void)
1125 {
1126 int lch;
1127
1128 if (dma_omap1())
1129 if (omap_lcd_dma_running())
1130 return 1;
1131
1132 for (lch = 0; lch < dma_chan_count; lch++)
1133 if (p->dma_read(CCR, lch) & OMAP_DMA_CCR_EN)
1134 return 1;
1135
1136 return 0;
1137 }
1138
1139 /*
1140 * lch_queue DMA will start right after lch_head one is finished.
1141 * For this DMA link to start, you still need to start (see omap_start_dma)
1142 * the first one. That will fire up the entire queue.
1143 */
1144 void omap_dma_link_lch(int lch_head, int lch_queue)
1145 {
1146 if (omap_dma_in_1510_mode()) {
1147 if (lch_head == lch_queue) {
1148 p->dma_write(p->dma_read(CCR, lch_head) | (3 << 8),
1149 CCR, lch_head);
1150 return;
1151 }
1152 printk(KERN_ERR "DMA linking is not supported in 1510 mode\n");
1153 BUG();
1154 return;
1155 }
1156
1157 if ((dma_chan[lch_head].dev_id == -1) ||
1158 (dma_chan[lch_queue].dev_id == -1)) {
1159 pr_err("omap_dma: trying to link non requested channels\n");
1160 dump_stack();
1161 }
1162
1163 dma_chan[lch_head].next_lch = lch_queue;
1164 }
1165 EXPORT_SYMBOL(omap_dma_link_lch);
1166
1167 /*
1168 * Once the DMA queue is stopped, we can destroy it.
1169 */
1170 void omap_dma_unlink_lch(int lch_head, int lch_queue)
1171 {
1172 if (omap_dma_in_1510_mode()) {
1173 if (lch_head == lch_queue) {
1174 p->dma_write(p->dma_read(CCR, lch_head) & ~(3 << 8),
1175 CCR, lch_head);
1176 return;
1177 }
1178 printk(KERN_ERR "DMA linking is not supported in 1510 mode\n");
1179 BUG();
1180 return;
1181 }
1182
1183 if (dma_chan[lch_head].next_lch != lch_queue ||
1184 dma_chan[lch_head].next_lch == -1) {
1185 pr_err("omap_dma: trying to unlink non linked channels\n");
1186 dump_stack();
1187 }
1188
1189 if ((dma_chan[lch_head].flags & OMAP_DMA_ACTIVE) ||
1190 (dma_chan[lch_queue].flags & OMAP_DMA_ACTIVE)) {
1191 pr_err("omap_dma: You need to stop the DMA channels before unlinking\n");
1192 dump_stack();
1193 }
1194
1195 dma_chan[lch_head].next_lch = -1;
1196 }
1197 EXPORT_SYMBOL(omap_dma_unlink_lch);
1198
1199 #ifndef CONFIG_ARCH_OMAP1
1200 /* Create chain of DMA channesls */
1201 static void create_dma_lch_chain(int lch_head, int lch_queue)
1202 {
1203 u32 l;
1204
1205 /* Check if this is the first link in chain */
1206 if (dma_chan[lch_head].next_linked_ch == -1) {
1207 dma_chan[lch_head].next_linked_ch = lch_queue;
1208 dma_chan[lch_head].prev_linked_ch = lch_queue;
1209 dma_chan[lch_queue].next_linked_ch = lch_head;
1210 dma_chan[lch_queue].prev_linked_ch = lch_head;
1211 }
1212
1213 /* a link exists, link the new channel in circular chain */
1214 else {
1215 dma_chan[lch_queue].next_linked_ch =
1216 dma_chan[lch_head].next_linked_ch;
1217 dma_chan[lch_queue].prev_linked_ch = lch_head;
1218 dma_chan[lch_head].next_linked_ch = lch_queue;
1219 dma_chan[dma_chan[lch_queue].next_linked_ch].prev_linked_ch =
1220 lch_queue;
1221 }
1222
1223 l = p->dma_read(CLNK_CTRL, lch_head);
1224 l &= ~(0x1f);
1225 l |= lch_queue;
1226 p->dma_write(l, CLNK_CTRL, lch_head);
1227
1228 l = p->dma_read(CLNK_CTRL, lch_queue);
1229 l &= ~(0x1f);
1230 l |= (dma_chan[lch_queue].next_linked_ch);
1231 p->dma_write(l, CLNK_CTRL, lch_queue);
1232 }
1233
1234 /**
1235 * @brief omap_request_dma_chain : Request a chain of DMA channels
1236 *
1237 * @param dev_id - Device id using the dma channel
1238 * @param dev_name - Device name
1239 * @param callback - Call back function
1240 * @chain_id -
1241 * @no_of_chans - Number of channels requested
1242 * @chain_mode - Dynamic or static chaining : OMAP_DMA_STATIC_CHAIN
1243 * OMAP_DMA_DYNAMIC_CHAIN
1244 * @params - Channel parameters
1245 *
1246 * @return - Success : 0
1247 * Failure: -EINVAL/-ENOMEM
1248 */
1249 int omap_request_dma_chain(int dev_id, const char *dev_name,
1250 void (*callback) (int lch, u16 ch_status,
1251 void *data),
1252 int *chain_id, int no_of_chans, int chain_mode,
1253 struct omap_dma_channel_params params)
1254 {
1255 int *channels;
1256 int i, err;
1257
1258 /* Is the chain mode valid ? */
1259 if (chain_mode != OMAP_DMA_STATIC_CHAIN
1260 && chain_mode != OMAP_DMA_DYNAMIC_CHAIN) {
1261 printk(KERN_ERR "Invalid chain mode requested\n");
1262 return -EINVAL;
1263 }
1264
1265 if (unlikely((no_of_chans < 1
1266 || no_of_chans > dma_lch_count))) {
1267 printk(KERN_ERR "Invalid Number of channels requested\n");
1268 return -EINVAL;
1269 }
1270
1271 /*
1272 * Allocate a queue to maintain the status of the channels
1273 * in the chain
1274 */
1275 channels = kmalloc(sizeof(*channels) * no_of_chans, GFP_KERNEL);
1276 if (channels == NULL) {
1277 printk(KERN_ERR "omap_dma: No memory for channel queue\n");
1278 return -ENOMEM;
1279 }
1280
1281 /* request and reserve DMA channels for the chain */
1282 for (i = 0; i < no_of_chans; i++) {
1283 err = omap_request_dma(dev_id, dev_name,
1284 callback, NULL, &channels[i]);
1285 if (err < 0) {
1286 int j;
1287 for (j = 0; j < i; j++)
1288 omap_free_dma(channels[j]);
1289 kfree(channels);
1290 printk(KERN_ERR "omap_dma: Request failed %d\n", err);
1291 return err;
1292 }
1293 dma_chan[channels[i]].prev_linked_ch = -1;
1294 dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
1295
1296 /*
1297 * Allowing client drivers to set common parameters now,
1298 * so that later only relevant (src_start, dest_start
1299 * and element count) can be set
1300 */
1301 omap_set_dma_params(channels[i], &params);
1302 }
1303
1304 *chain_id = channels[0];
1305 dma_linked_lch[*chain_id].linked_dmach_q = channels;
1306 dma_linked_lch[*chain_id].chain_mode = chain_mode;
1307 dma_linked_lch[*chain_id].chain_state = DMA_CHAIN_NOTSTARTED;
1308 dma_linked_lch[*chain_id].no_of_lchs_linked = no_of_chans;
1309
1310 for (i = 0; i < no_of_chans; i++)
1311 dma_chan[channels[i]].chain_id = *chain_id;
1312
1313 /* Reset the Queue pointers */
1314 OMAP_DMA_CHAIN_QINIT(*chain_id);
1315
1316 /* Set up the chain */
1317 if (no_of_chans == 1)
1318 create_dma_lch_chain(channels[0], channels[0]);
1319 else {
1320 for (i = 0; i < (no_of_chans - 1); i++)
1321 create_dma_lch_chain(channels[i], channels[i + 1]);
1322 }
1323
1324 return 0;
1325 }
1326 EXPORT_SYMBOL(omap_request_dma_chain);
1327
1328 /**
1329 * @brief omap_modify_dma_chain_param : Modify the chain's params - Modify the
1330 * params after setting it. Dont do this while dma is running!!
1331 *
1332 * @param chain_id - Chained logical channel id.
1333 * @param params
1334 *
1335 * @return - Success : 0
1336 * Failure : -EINVAL
1337 */
1338 int omap_modify_dma_chain_params(int chain_id,
1339 struct omap_dma_channel_params params)
1340 {
1341 int *channels;
1342 u32 i;
1343
1344 /* Check for input params */
1345 if (unlikely((chain_id < 0
1346 || chain_id >= dma_lch_count))) {
1347 printk(KERN_ERR "Invalid chain id\n");
1348 return -EINVAL;
1349 }
1350
1351 /* Check if the chain exists */
1352 if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1353 printk(KERN_ERR "Chain doesn't exists\n");
1354 return -EINVAL;
1355 }
1356 channels = dma_linked_lch[chain_id].linked_dmach_q;
1357
1358 for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
1359 /*
1360 * Allowing client drivers to set common parameters now,
1361 * so that later only relevant (src_start, dest_start
1362 * and element count) can be set
1363 */
1364 omap_set_dma_params(channels[i], &params);
1365 }
1366
1367 return 0;
1368 }
1369 EXPORT_SYMBOL(omap_modify_dma_chain_params);
1370
1371 /**
1372 * @brief omap_free_dma_chain - Free all the logical channels in a chain.
1373 *
1374 * @param chain_id
1375 *
1376 * @return - Success : 0
1377 * Failure : -EINVAL
1378 */
1379 int omap_free_dma_chain(int chain_id)
1380 {
1381 int *channels;
1382 u32 i;
1383
1384 /* Check for input params */
1385 if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1386 printk(KERN_ERR "Invalid chain id\n");
1387 return -EINVAL;
1388 }
1389
1390 /* Check if the chain exists */
1391 if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1392 printk(KERN_ERR "Chain doesn't exists\n");
1393 return -EINVAL;
1394 }
1395
1396 channels = dma_linked_lch[chain_id].linked_dmach_q;
1397 for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
1398 dma_chan[channels[i]].next_linked_ch = -1;
1399 dma_chan[channels[i]].prev_linked_ch = -1;
1400 dma_chan[channels[i]].chain_id = -1;
1401 dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
1402 omap_free_dma(channels[i]);
1403 }
1404
1405 kfree(channels);
1406
1407 dma_linked_lch[chain_id].linked_dmach_q = NULL;
1408 dma_linked_lch[chain_id].chain_mode = -1;
1409 dma_linked_lch[chain_id].chain_state = -1;
1410
1411 return (0);
1412 }
1413 EXPORT_SYMBOL(omap_free_dma_chain);
1414
1415 /**
1416 * @brief omap_dma_chain_status - Check if the chain is in
1417 * active / inactive state.
1418 * @param chain_id
1419 *
1420 * @return - Success : OMAP_DMA_CHAIN_ACTIVE/OMAP_DMA_CHAIN_INACTIVE
1421 * Failure : -EINVAL
1422 */
1423 int omap_dma_chain_status(int chain_id)
1424 {
1425 /* Check for input params */
1426 if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1427 printk(KERN_ERR "Invalid chain id\n");
1428 return -EINVAL;
1429 }
1430
1431 /* Check if the chain exists */
1432 if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1433 printk(KERN_ERR "Chain doesn't exists\n");
1434 return -EINVAL;
1435 }
1436 pr_debug("CHAINID=%d, qcnt=%d\n", chain_id,
1437 dma_linked_lch[chain_id].q_count);
1438
1439 if (OMAP_DMA_CHAIN_QEMPTY(chain_id))
1440 return OMAP_DMA_CHAIN_INACTIVE;
1441
1442 return OMAP_DMA_CHAIN_ACTIVE;
1443 }
1444 EXPORT_SYMBOL(omap_dma_chain_status);
1445
1446 /**
1447 * @brief omap_dma_chain_a_transfer - Get a free channel from a chain,
1448 * set the params and start the transfer.
1449 *
1450 * @param chain_id
1451 * @param src_start - buffer start address
1452 * @param dest_start - Dest address
1453 * @param elem_count
1454 * @param frame_count
1455 * @param callbk_data - channel callback parameter data.
1456 *
1457 * @return - Success : 0
1458 * Failure: -EINVAL/-EBUSY
1459 */
1460 int omap_dma_chain_a_transfer(int chain_id, int src_start, int dest_start,
1461 int elem_count, int frame_count, void *callbk_data)
1462 {
1463 int *channels;
1464 u32 l, lch;
1465 int start_dma = 0;
1466
1467 /*
1468 * if buffer size is less than 1 then there is
1469 * no use of starting the chain
1470 */
1471 if (elem_count < 1) {
1472 printk(KERN_ERR "Invalid buffer size\n");
1473 return -EINVAL;
1474 }
1475
1476 /* Check for input params */
1477 if (unlikely((chain_id < 0
1478 || chain_id >= dma_lch_count))) {
1479 printk(KERN_ERR "Invalid chain id\n");
1480 return -EINVAL;
1481 }
1482
1483 /* Check if the chain exists */
1484 if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1485 printk(KERN_ERR "Chain doesn't exist\n");
1486 return -EINVAL;
1487 }
1488
1489 /* Check if all the channels in chain are in use */
1490 if (OMAP_DMA_CHAIN_QFULL(chain_id))
1491 return -EBUSY;
1492
1493 /* Frame count may be negative in case of indexed transfers */
1494 channels = dma_linked_lch[chain_id].linked_dmach_q;
1495
1496 /* Get a free channel */
1497 lch = channels[dma_linked_lch[chain_id].q_tail];
1498
1499 /* Store the callback data */
1500 dma_chan[lch].data = callbk_data;
1501
1502 /* Increment the q_tail */
1503 OMAP_DMA_CHAIN_INCQTAIL(chain_id);
1504
1505 /* Set the params to the free channel */
1506 if (src_start != 0)
1507 p->dma_write(src_start, CSSA, lch);
1508 if (dest_start != 0)
1509 p->dma_write(dest_start, CDSA, lch);
1510
1511 /* Write the buffer size */
1512 p->dma_write(elem_count, CEN, lch);
1513 p->dma_write(frame_count, CFN, lch);
1514
1515 /*
1516 * If the chain is dynamically linked,
1517 * then we may have to start the chain if its not active
1518 */
1519 if (dma_linked_lch[chain_id].chain_mode == OMAP_DMA_DYNAMIC_CHAIN) {
1520
1521 /*
1522 * In Dynamic chain, if the chain is not started,
1523 * queue the channel
1524 */
1525 if (dma_linked_lch[chain_id].chain_state ==
1526 DMA_CHAIN_NOTSTARTED) {
1527 /* Enable the link in previous channel */
1528 if (dma_chan[dma_chan[lch].prev_linked_ch].state ==
1529 DMA_CH_QUEUED)
1530 enable_lnk(dma_chan[lch].prev_linked_ch);
1531 dma_chan[lch].state = DMA_CH_QUEUED;
1532 }
1533
1534 /*
1535 * Chain is already started, make sure its active,
1536 * if not then start the chain
1537 */
1538 else {
1539 start_dma = 1;
1540
1541 if (dma_chan[dma_chan[lch].prev_linked_ch].state ==
1542 DMA_CH_STARTED) {
1543 enable_lnk(dma_chan[lch].prev_linked_ch);
1544 dma_chan[lch].state = DMA_CH_QUEUED;
1545 start_dma = 0;
1546 if (0 == ((1 << 7) & p->dma_read(
1547 CCR, dma_chan[lch].prev_linked_ch))) {
1548 disable_lnk(dma_chan[lch].
1549 prev_linked_ch);
1550 pr_debug("\n prev ch is stopped\n");
1551 start_dma = 1;
1552 }
1553 }
1554
1555 else if (dma_chan[dma_chan[lch].prev_linked_ch].state
1556 == DMA_CH_QUEUED) {
1557 enable_lnk(dma_chan[lch].prev_linked_ch);
1558 dma_chan[lch].state = DMA_CH_QUEUED;
1559 start_dma = 0;
1560 }
1561 omap_enable_channel_irq(lch);
1562
1563 l = p->dma_read(CCR, lch);
1564
1565 if ((0 == (l & (1 << 24))))
1566 l &= ~(1 << 25);
1567 else
1568 l |= (1 << 25);
1569 if (start_dma == 1) {
1570 if (0 == (l & (1 << 7))) {
1571 l |= (1 << 7);
1572 dma_chan[lch].state = DMA_CH_STARTED;
1573 pr_debug("starting %d\n", lch);
1574 p->dma_write(l, CCR, lch);
1575 } else
1576 start_dma = 0;
1577 } else {
1578 if (0 == (l & (1 << 7)))
1579 p->dma_write(l, CCR, lch);
1580 }
1581 dma_chan[lch].flags |= OMAP_DMA_ACTIVE;
1582 }
1583 }
1584
1585 return 0;
1586 }
1587 EXPORT_SYMBOL(omap_dma_chain_a_transfer);
1588
1589 /**
1590 * @brief omap_start_dma_chain_transfers - Start the chain
1591 *
1592 * @param chain_id
1593 *
1594 * @return - Success : 0
1595 * Failure : -EINVAL/-EBUSY
1596 */
1597 int omap_start_dma_chain_transfers(int chain_id)
1598 {
1599 int *channels;
1600 u32 l, i;
1601
1602 if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1603 printk(KERN_ERR "Invalid chain id\n");
1604 return -EINVAL;
1605 }
1606
1607 channels = dma_linked_lch[chain_id].linked_dmach_q;
1608
1609 if (dma_linked_lch[channels[0]].chain_state == DMA_CHAIN_STARTED) {
1610 printk(KERN_ERR "Chain is already started\n");
1611 return -EBUSY;
1612 }
1613
1614 if (dma_linked_lch[chain_id].chain_mode == OMAP_DMA_STATIC_CHAIN) {
1615 for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked;
1616 i++) {
1617 enable_lnk(channels[i]);
1618 omap_enable_channel_irq(channels[i]);
1619 }
1620 } else {
1621 omap_enable_channel_irq(channels[0]);
1622 }
1623
1624 l = p->dma_read(CCR, channels[0]);
1625 l |= (1 << 7);
1626 dma_linked_lch[chain_id].chain_state = DMA_CHAIN_STARTED;
1627 dma_chan[channels[0]].state = DMA_CH_STARTED;
1628
1629 if ((0 == (l & (1 << 24))))
1630 l &= ~(1 << 25);
1631 else
1632 l |= (1 << 25);
1633 p->dma_write(l, CCR, channels[0]);
1634
1635 dma_chan[channels[0]].flags |= OMAP_DMA_ACTIVE;
1636
1637 return 0;
1638 }
1639 EXPORT_SYMBOL(omap_start_dma_chain_transfers);
1640
1641 /**
1642 * @brief omap_stop_dma_chain_transfers - Stop the dma transfer of a chain.
1643 *
1644 * @param chain_id
1645 *
1646 * @return - Success : 0
1647 * Failure : EINVAL
1648 */
1649 int omap_stop_dma_chain_transfers(int chain_id)
1650 {
1651 int *channels;
1652 u32 l, i;
1653 u32 sys_cf = 0;
1654
1655 /* Check for input params */
1656 if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1657 printk(KERN_ERR "Invalid chain id\n");
1658 return -EINVAL;
1659 }
1660
1661 /* Check if the chain exists */
1662 if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1663 printk(KERN_ERR "Chain doesn't exists\n");
1664 return -EINVAL;
1665 }
1666 channels = dma_linked_lch[chain_id].linked_dmach_q;
1667
1668 if (IS_DMA_ERRATA(DMA_ERRATA_i88)) {
1669 sys_cf = p->dma_read(OCP_SYSCONFIG, 0);
1670 l = sys_cf;
1671 /* Middle mode reg set no Standby */
1672 l &= ~((1 << 12)|(1 << 13));
1673 p->dma_write(l, OCP_SYSCONFIG, 0);
1674 }
1675
1676 for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
1677
1678 /* Stop the Channel transmission */
1679 l = p->dma_read(CCR, channels[i]);
1680 l &= ~(1 << 7);
1681 p->dma_write(l, CCR, channels[i]);
1682
1683 /* Disable the link in all the channels */
1684 disable_lnk(channels[i]);
1685 dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
1686
1687 }
1688 dma_linked_lch[chain_id].chain_state = DMA_CHAIN_NOTSTARTED;
1689
1690 /* Reset the Queue pointers */
1691 OMAP_DMA_CHAIN_QINIT(chain_id);
1692
1693 if (IS_DMA_ERRATA(DMA_ERRATA_i88))
1694 p->dma_write(sys_cf, OCP_SYSCONFIG, 0);
1695
1696 return 0;
1697 }
1698 EXPORT_SYMBOL(omap_stop_dma_chain_transfers);
1699
1700 /* Get the index of the ongoing DMA in chain */
1701 /**
1702 * @brief omap_get_dma_chain_index - Get the element and frame index
1703 * of the ongoing DMA in chain
1704 *
1705 * @param chain_id
1706 * @param ei - Element index
1707 * @param fi - Frame index
1708 *
1709 * @return - Success : 0
1710 * Failure : -EINVAL
1711 */
1712 int omap_get_dma_chain_index(int chain_id, int *ei, int *fi)
1713 {
1714 int lch;
1715 int *channels;
1716
1717 /* Check for input params */
1718 if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1719 printk(KERN_ERR "Invalid chain id\n");
1720 return -EINVAL;
1721 }
1722
1723 /* Check if the chain exists */
1724 if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1725 printk(KERN_ERR "Chain doesn't exists\n");
1726 return -EINVAL;
1727 }
1728 if ((!ei) || (!fi))
1729 return -EINVAL;
1730
1731 channels = dma_linked_lch[chain_id].linked_dmach_q;
1732
1733 /* Get the current channel */
1734 lch = channels[dma_linked_lch[chain_id].q_head];
1735
1736 *ei = p->dma_read(CCEN, lch);
1737 *fi = p->dma_read(CCFN, lch);
1738
1739 return 0;
1740 }
1741 EXPORT_SYMBOL(omap_get_dma_chain_index);
1742
1743 /**
1744 * @brief omap_get_dma_chain_dst_pos - Get the destination position of the
1745 * ongoing DMA in chain
1746 *
1747 * @param chain_id
1748 *
1749 * @return - Success : Destination position
1750 * Failure : -EINVAL
1751 */
1752 int omap_get_dma_chain_dst_pos(int chain_id)
1753 {
1754 int lch;
1755 int *channels;
1756
1757 /* Check for input params */
1758 if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1759 printk(KERN_ERR "Invalid chain id\n");
1760 return -EINVAL;
1761 }
1762
1763 /* Check if the chain exists */
1764 if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1765 printk(KERN_ERR "Chain doesn't exists\n");
1766 return -EINVAL;
1767 }
1768
1769 channels = dma_linked_lch[chain_id].linked_dmach_q;
1770
1771 /* Get the current channel */
1772 lch = channels[dma_linked_lch[chain_id].q_head];
1773
1774 return p->dma_read(CDAC, lch);
1775 }
1776 EXPORT_SYMBOL(omap_get_dma_chain_dst_pos);
1777
1778 /**
1779 * @brief omap_get_dma_chain_src_pos - Get the source position
1780 * of the ongoing DMA in chain
1781 * @param chain_id
1782 *
1783 * @return - Success : Destination position
1784 * Failure : -EINVAL
1785 */
1786 int omap_get_dma_chain_src_pos(int chain_id)
1787 {
1788 int lch;
1789 int *channels;
1790
1791 /* Check for input params */
1792 if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1793 printk(KERN_ERR "Invalid chain id\n");
1794 return -EINVAL;
1795 }
1796
1797 /* Check if the chain exists */
1798 if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1799 printk(KERN_ERR "Chain doesn't exists\n");
1800 return -EINVAL;
1801 }
1802
1803 channels = dma_linked_lch[chain_id].linked_dmach_q;
1804
1805 /* Get the current channel */
1806 lch = channels[dma_linked_lch[chain_id].q_head];
1807
1808 return p->dma_read(CSAC, lch);
1809 }
1810 EXPORT_SYMBOL(omap_get_dma_chain_src_pos);
1811 #endif /* ifndef CONFIG_ARCH_OMAP1 */
1812
1813 /*----------------------------------------------------------------------------*/
1814
1815 #ifdef CONFIG_ARCH_OMAP1
1816
1817 static int omap1_dma_handle_ch(int ch)
1818 {
1819 u32 csr;
1820
1821 if (enable_1510_mode && ch >= 6) {
1822 csr = dma_chan[ch].saved_csr;
1823 dma_chan[ch].saved_csr = 0;
1824 } else
1825 csr = p->dma_read(CSR, ch);
1826 if (enable_1510_mode && ch <= 2 && (csr >> 7) != 0) {
1827 dma_chan[ch + 6].saved_csr = csr >> 7;
1828 csr &= 0x7f;
1829 }
1830 if ((csr & 0x3f) == 0)
1831 return 0;
1832 if (unlikely(dma_chan[ch].dev_id == -1)) {
1833 pr_warn("Spurious interrupt from DMA channel %d (CSR %04x)\n",
1834 ch, csr);
1835 return 0;
1836 }
1837 if (unlikely(csr & OMAP1_DMA_TOUT_IRQ))
1838 pr_warn("DMA timeout with device %d\n", dma_chan[ch].dev_id);
1839 if (unlikely(csr & OMAP_DMA_DROP_IRQ))
1840 pr_warn("DMA synchronization event drop occurred with device %d\n",
1841 dma_chan[ch].dev_id);
1842 if (likely(csr & OMAP_DMA_BLOCK_IRQ))
1843 dma_chan[ch].flags &= ~OMAP_DMA_ACTIVE;
1844 if (likely(dma_chan[ch].callback != NULL))
1845 dma_chan[ch].callback(ch, csr, dma_chan[ch].data);
1846
1847 return 1;
1848 }
1849
1850 static irqreturn_t omap1_dma_irq_handler(int irq, void *dev_id)
1851 {
1852 int ch = ((int) dev_id) - 1;
1853 int handled = 0;
1854
1855 for (;;) {
1856 int handled_now = 0;
1857
1858 handled_now += omap1_dma_handle_ch(ch);
1859 if (enable_1510_mode && dma_chan[ch + 6].saved_csr)
1860 handled_now += omap1_dma_handle_ch(ch + 6);
1861 if (!handled_now)
1862 break;
1863 handled += handled_now;
1864 }
1865
1866 return handled ? IRQ_HANDLED : IRQ_NONE;
1867 }
1868
1869 #else
1870 #define omap1_dma_irq_handler NULL
1871 #endif
1872
1873 #ifdef CONFIG_ARCH_OMAP2PLUS
1874
1875 static int omap2_dma_handle_ch(int ch)
1876 {
1877 u32 status = p->dma_read(CSR, ch);
1878
1879 if (!status) {
1880 if (printk_ratelimit())
1881 pr_warn("Spurious DMA IRQ for lch %d\n", ch);
1882 p->dma_write(1 << ch, IRQSTATUS_L0, ch);
1883 return 0;
1884 }
1885 if (unlikely(dma_chan[ch].dev_id == -1)) {
1886 if (printk_ratelimit())
1887 pr_warn("IRQ %04x for non-allocated DMA channel %d\n",
1888 status, ch);
1889 return 0;
1890 }
1891 if (unlikely(status & OMAP_DMA_DROP_IRQ))
1892 pr_info("DMA synchronization event drop occurred with device %d\n",
1893 dma_chan[ch].dev_id);
1894 if (unlikely(status & OMAP2_DMA_TRANS_ERR_IRQ)) {
1895 printk(KERN_INFO "DMA transaction error with device %d\n",
1896 dma_chan[ch].dev_id);
1897 if (IS_DMA_ERRATA(DMA_ERRATA_i378)) {
1898 u32 ccr;
1899
1900 ccr = p->dma_read(CCR, ch);
1901 ccr &= ~OMAP_DMA_CCR_EN;
1902 p->dma_write(ccr, CCR, ch);
1903 dma_chan[ch].flags &= ~OMAP_DMA_ACTIVE;
1904 }
1905 }
1906 if (unlikely(status & OMAP2_DMA_SECURE_ERR_IRQ))
1907 printk(KERN_INFO "DMA secure error with device %d\n",
1908 dma_chan[ch].dev_id);
1909 if (unlikely(status & OMAP2_DMA_MISALIGNED_ERR_IRQ))
1910 printk(KERN_INFO "DMA misaligned error with device %d\n",
1911 dma_chan[ch].dev_id);
1912
1913 p->dma_write(status, CSR, ch);
1914 p->dma_write(1 << ch, IRQSTATUS_L0, ch);
1915 /* read back the register to flush the write */
1916 p->dma_read(IRQSTATUS_L0, ch);
1917
1918 /* If the ch is not chained then chain_id will be -1 */
1919 if (dma_chan[ch].chain_id != -1) {
1920 int chain_id = dma_chan[ch].chain_id;
1921 dma_chan[ch].state = DMA_CH_NOTSTARTED;
1922 if (p->dma_read(CLNK_CTRL, ch) & (1 << 15))
1923 dma_chan[dma_chan[ch].next_linked_ch].state =
1924 DMA_CH_STARTED;
1925 if (dma_linked_lch[chain_id].chain_mode ==
1926 OMAP_DMA_DYNAMIC_CHAIN)
1927 disable_lnk(ch);
1928
1929 if (!OMAP_DMA_CHAIN_QEMPTY(chain_id))
1930 OMAP_DMA_CHAIN_INCQHEAD(chain_id);
1931
1932 status = p->dma_read(CSR, ch);
1933 p->dma_write(status, CSR, ch);
1934 }
1935
1936 if (likely(dma_chan[ch].callback != NULL))
1937 dma_chan[ch].callback(ch, status, dma_chan[ch].data);
1938
1939 return 0;
1940 }
1941
1942 /* STATUS register count is from 1-32 while our is 0-31 */
1943 static irqreturn_t omap2_dma_irq_handler(int irq, void *dev_id)
1944 {
1945 u32 val, enable_reg;
1946 int i;
1947
1948 val = p->dma_read(IRQSTATUS_L0, 0);
1949 if (val == 0) {
1950 if (printk_ratelimit())
1951 printk(KERN_WARNING "Spurious DMA IRQ\n");
1952 return IRQ_HANDLED;
1953 }
1954 enable_reg = p->dma_read(IRQENABLE_L0, 0);
1955 val &= enable_reg; /* Dispatch only relevant interrupts */
1956 for (i = 0; i < dma_lch_count && val != 0; i++) {
1957 if (val & 1)
1958 omap2_dma_handle_ch(i);
1959 val >>= 1;
1960 }
1961
1962 return IRQ_HANDLED;
1963 }
1964
1965 static struct irqaction omap24xx_dma_irq = {
1966 .name = "DMA",
1967 .handler = omap2_dma_irq_handler,
1968 };
1969
1970 #else
1971 static struct irqaction omap24xx_dma_irq;
1972 #endif
1973
1974 /*----------------------------------------------------------------------------*/
1975
1976 void omap_dma_global_context_save(void)
1977 {
1978 omap_dma_global_context.dma_irqenable_l0 =
1979 p->dma_read(IRQENABLE_L0, 0);
1980 omap_dma_global_context.dma_ocp_sysconfig =
1981 p->dma_read(OCP_SYSCONFIG, 0);
1982 omap_dma_global_context.dma_gcr = p->dma_read(GCR, 0);
1983 }
1984
1985 void omap_dma_global_context_restore(void)
1986 {
1987 int ch;
1988
1989 p->dma_write(omap_dma_global_context.dma_gcr, GCR, 0);
1990 p->dma_write(omap_dma_global_context.dma_ocp_sysconfig,
1991 OCP_SYSCONFIG, 0);
1992 p->dma_write(omap_dma_global_context.dma_irqenable_l0,
1993 IRQENABLE_L0, 0);
1994
1995 if (IS_DMA_ERRATA(DMA_ROMCODE_BUG))
1996 p->dma_write(0x3 , IRQSTATUS_L0, 0);
1997
1998 for (ch = 0; ch < dma_chan_count; ch++)
1999 if (dma_chan[ch].dev_id != -1)
2000 omap_clear_dma(ch);
2001 }
2002
2003 static int omap_system_dma_probe(struct platform_device *pdev)
2004 {
2005 int ch, ret = 0;
2006 int dma_irq;
2007 char irq_name[4];
2008 int irq_rel;
2009
2010 p = pdev->dev.platform_data;
2011 if (!p) {
2012 dev_err(&pdev->dev,
2013 "%s: System DMA initialized without platform data\n",
2014 __func__);
2015 return -EINVAL;
2016 }
2017
2018 d = p->dma_attr;
2019 errata = p->errata;
2020
2021 if ((d->dev_caps & RESERVE_CHANNEL) && omap_dma_reserve_channels
2022 && (omap_dma_reserve_channels < d->lch_count))
2023 d->lch_count = omap_dma_reserve_channels;
2024
2025 dma_lch_count = d->lch_count;
2026 dma_chan_count = dma_lch_count;
2027 dma_chan = d->chan;
2028 enable_1510_mode = d->dev_caps & ENABLE_1510_MODE;
2029
2030 if (dma_omap2plus()) {
2031 dma_linked_lch = kzalloc(sizeof(struct dma_link_info) *
2032 dma_lch_count, GFP_KERNEL);
2033 if (!dma_linked_lch) {
2034 ret = -ENOMEM;
2035 goto exit_dma_lch_fail;
2036 }
2037 }
2038
2039 spin_lock_init(&dma_chan_lock);
2040 for (ch = 0; ch < dma_chan_count; ch++) {
2041 omap_clear_dma(ch);
2042 if (dma_omap2plus())
2043 omap2_disable_irq_lch(ch);
2044
2045 dma_chan[ch].dev_id = -1;
2046 dma_chan[ch].next_lch = -1;
2047
2048 if (ch >= 6 && enable_1510_mode)
2049 continue;
2050
2051 if (dma_omap1()) {
2052 /*
2053 * request_irq() doesn't like dev_id (ie. ch) being
2054 * zero, so we have to kludge around this.
2055 */
2056 sprintf(&irq_name[0], "%d", ch);
2057 dma_irq = platform_get_irq_byname(pdev, irq_name);
2058
2059 if (dma_irq < 0) {
2060 ret = dma_irq;
2061 goto exit_dma_irq_fail;
2062 }
2063
2064 /* INT_DMA_LCD is handled in lcd_dma.c */
2065 if (dma_irq == INT_DMA_LCD)
2066 continue;
2067
2068 ret = request_irq(dma_irq,
2069 omap1_dma_irq_handler, 0, "DMA",
2070 (void *) (ch + 1));
2071 if (ret != 0)
2072 goto exit_dma_irq_fail;
2073 }
2074 }
2075
2076 if (d->dev_caps & IS_RW_PRIORITY)
2077 omap_dma_set_global_params(DMA_DEFAULT_ARB_RATE,
2078 DMA_DEFAULT_FIFO_DEPTH, 0);
2079
2080 if (dma_omap2plus()) {
2081 strcpy(irq_name, "0");
2082 dma_irq = platform_get_irq_byname(pdev, irq_name);
2083 if (dma_irq < 0) {
2084 dev_err(&pdev->dev, "failed: request IRQ %d", dma_irq);
2085 ret = dma_irq;
2086 goto exit_dma_lch_fail;
2087 }
2088 ret = setup_irq(dma_irq, &omap24xx_dma_irq);
2089 if (ret) {
2090 dev_err(&pdev->dev, "set_up failed for IRQ %d for DMA (error %d)\n",
2091 dma_irq, ret);
2092 goto exit_dma_lch_fail;
2093 }
2094 }
2095
2096 /* reserve dma channels 0 and 1 in high security devices on 34xx */
2097 if (d->dev_caps & HS_CHANNELS_RESERVED) {
2098 pr_info("Reserving DMA channels 0 and 1 for HS ROM code\n");
2099 dma_chan[0].dev_id = 0;
2100 dma_chan[1].dev_id = 1;
2101 }
2102 p->show_dma_caps();
2103 return 0;
2104
2105 exit_dma_irq_fail:
2106 dev_err(&pdev->dev, "unable to request IRQ %d for DMA (error %d)\n",
2107 dma_irq, ret);
2108 for (irq_rel = 0; irq_rel < ch; irq_rel++) {
2109 dma_irq = platform_get_irq(pdev, irq_rel);
2110 free_irq(dma_irq, (void *)(irq_rel + 1));
2111 }
2112
2113 exit_dma_lch_fail:
2114 kfree(dma_chan);
2115 return ret;
2116 }
2117
2118 static int omap_system_dma_remove(struct platform_device *pdev)
2119 {
2120 int dma_irq;
2121
2122 if (dma_omap2plus()) {
2123 char irq_name[4];
2124 strcpy(irq_name, "0");
2125 dma_irq = platform_get_irq_byname(pdev, irq_name);
2126 remove_irq(dma_irq, &omap24xx_dma_irq);
2127 } else {
2128 int irq_rel = 0;
2129 for ( ; irq_rel < dma_chan_count; irq_rel++) {
2130 dma_irq = platform_get_irq(pdev, irq_rel);
2131 free_irq(dma_irq, (void *)(irq_rel + 1));
2132 }
2133 }
2134 kfree(dma_chan);
2135 return 0;
2136 }
2137
2138 static struct platform_driver omap_system_dma_driver = {
2139 .probe = omap_system_dma_probe,
2140 .remove = omap_system_dma_remove,
2141 .driver = {
2142 .name = "omap_dma_system"
2143 },
2144 };
2145
2146 static int __init omap_system_dma_init(void)
2147 {
2148 return platform_driver_register(&omap_system_dma_driver);
2149 }
2150 arch_initcall(omap_system_dma_init);
2151
2152 static void __exit omap_system_dma_exit(void)
2153 {
2154 platform_driver_unregister(&omap_system_dma_driver);
2155 }
2156
2157 MODULE_DESCRIPTION("OMAP SYSTEM DMA DRIVER");
2158 MODULE_LICENSE("GPL");
2159 MODULE_ALIAS("platform:" DRIVER_NAME);
2160 MODULE_AUTHOR("Texas Instruments Inc");
2161
2162 /*
2163 * Reserve the omap SDMA channels using cmdline bootarg
2164 * "omap_dma_reserve_ch=". The valid range is 1 to 32
2165 */
2166 static int __init omap_dma_cmdline_reserve_ch(char *str)
2167 {
2168 if (get_option(&str, &omap_dma_reserve_channels) != 1)
2169 omap_dma_reserve_channels = 0;
2170 return 1;
2171 }
2172
2173 __setup("omap_dma_reserve_ch=", omap_dma_cmdline_reserve_ch);
2174
2175
Linux kernel - Deliverables
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