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[linux-2.6/next.git] / arch / arm / plat-omap / dma.c
blobc22217c2ee5f334adf95f01addd2d85ad7bdf28b
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 <asm/system.h>
40 #include <mach/hardware.h>
41 #include <plat/dma.h>
42
43 #include <plat/tc.h>
44
45 #undef DEBUG
46
47 #ifndef CONFIG_ARCH_OMAP1
48 enum { DMA_CH_ALLOC_DONE, DMA_CH_PARAMS_SET_DONE, DMA_CH_STARTED,
49 DMA_CH_QUEUED, DMA_CH_NOTSTARTED, DMA_CH_PAUSED, DMA_CH_LINK_ENABLED
50 };
51
52 enum { DMA_CHAIN_STARTED, DMA_CHAIN_NOTSTARTED };
53 #endif
54
55 #define OMAP_DMA_ACTIVE 0x01
56 #define OMAP2_DMA_CSR_CLEAR_MASK 0xffffffff
57
58 #define OMAP_FUNC_MUX_ARM_BASE (0xfffe1000 + 0xec)
59
60 static struct omap_system_dma_plat_info *p;
61 static struct omap_dma_dev_attr *d;
62
63 static int enable_1510_mode;
64 static u32 errata;
65
66 static struct omap_dma_global_context_registers {
67 u32 dma_irqenable_l0;
68 u32 dma_ocp_sysconfig;
69 u32 dma_gcr;
70 } omap_dma_global_context;
71
72 struct dma_link_info {
73 int *linked_dmach_q;
74 int no_of_lchs_linked;
75
76 int q_count;
77 int q_tail;
78 int q_head;
79
80 int chain_state;
81 int chain_mode;
82
83 };
84
85 static struct dma_link_info *dma_linked_lch;
86
87 #ifndef CONFIG_ARCH_OMAP1
88
89 /* Chain handling macros */
90 #define OMAP_DMA_CHAIN_QINIT(chain_id) \
91 do { \
92 dma_linked_lch[chain_id].q_head = \
93 dma_linked_lch[chain_id].q_tail = \
94 dma_linked_lch[chain_id].q_count = 0; \
95 } while (0)
96 #define OMAP_DMA_CHAIN_QFULL(chain_id) \
97 (dma_linked_lch[chain_id].no_of_lchs_linked == \
98 dma_linked_lch[chain_id].q_count)
99 #define OMAP_DMA_CHAIN_QLAST(chain_id) \
100 do { \
101 ((dma_linked_lch[chain_id].no_of_lchs_linked-1) == \
102 dma_linked_lch[chain_id].q_count) \
103 } while (0)
104 #define OMAP_DMA_CHAIN_QEMPTY(chain_id) \
105 (0 == dma_linked_lch[chain_id].q_count)
106 #define __OMAP_DMA_CHAIN_INCQ(end) \
107 ((end) = ((end)+1) % dma_linked_lch[chain_id].no_of_lchs_linked)
108 #define OMAP_DMA_CHAIN_INCQHEAD(chain_id) \
109 do { \
110 __OMAP_DMA_CHAIN_INCQ(dma_linked_lch[chain_id].q_head); \
111 dma_linked_lch[chain_id].q_count--; \
112 } while (0)
113
114 #define OMAP_DMA_CHAIN_INCQTAIL(chain_id) \
115 do { \
116 __OMAP_DMA_CHAIN_INCQ(dma_linked_lch[chain_id].q_tail); \
117 dma_linked_lch[chain_id].q_count++; \
118 } while (0)
119 #endif
120
121 static int dma_lch_count;
122 static int dma_chan_count;
123 static int omap_dma_reserve_channels;
124
125 static spinlock_t dma_chan_lock;
126 static struct omap_dma_lch *dma_chan;
127
128 static inline void disable_lnk(int lch);
129 static void omap_disable_channel_irq(int lch);
130 static inline void omap_enable_channel_irq(int lch);
131
132 #define REVISIT_24XX() printk(KERN_ERR "FIXME: no %s on 24xx\n", \
133 __func__);
134
135 #ifdef CONFIG_ARCH_OMAP15XX
136 /* Returns 1 if the DMA module is in OMAP1510-compatible mode, 0 otherwise */
137 static int omap_dma_in_1510_mode(void)
138 {
139 return enable_1510_mode;
140 }
141 #else
142 #define omap_dma_in_1510_mode() 0
143 #endif
144
145 #ifdef CONFIG_ARCH_OMAP1
146 static inline int get_gdma_dev(int req)
147 {
148 u32 reg = OMAP_FUNC_MUX_ARM_BASE + ((req - 1) / 5) * 4;
149 int shift = ((req - 1) % 5) * 6;
150
151 return ((omap_readl(reg) >> shift) & 0x3f) + 1;
152 }
153
154 static inline void set_gdma_dev(int req, int dev)
155 {
156 u32 reg = OMAP_FUNC_MUX_ARM_BASE + ((req - 1) / 5) * 4;
157 int shift = ((req - 1) % 5) * 6;
158 u32 l;
159
160 l = omap_readl(reg);
161 l &= ~(0x3f << shift);
162 l |= (dev - 1) << shift;
163 omap_writel(l, reg);
164 }
165 #else
166 #define set_gdma_dev(req, dev) do {} while (0)
167 #endif
168
169 void omap_set_dma_priority(int lch, int dst_port, int priority)
170 {
171 unsigned long reg;
172 u32 l;
173
174 if (cpu_class_is_omap1()) {
175 switch (dst_port) {
176 case OMAP_DMA_PORT_OCP_T1: /* FFFECC00 */
177 reg = OMAP_TC_OCPT1_PRIOR;
178 break;
179 case OMAP_DMA_PORT_OCP_T2: /* FFFECCD0 */
180 reg = OMAP_TC_OCPT2_PRIOR;
181 break;
182 case OMAP_DMA_PORT_EMIFF: /* FFFECC08 */
183 reg = OMAP_TC_EMIFF_PRIOR;
184 break;
185 case OMAP_DMA_PORT_EMIFS: /* FFFECC04 */
186 reg = OMAP_TC_EMIFS_PRIOR;
187 break;
188 default:
189 BUG();
190 return;
191 }
192 l = omap_readl(reg);
193 l &= ~(0xf << 8);
194 l |= (priority & 0xf) << 8;
195 omap_writel(l, reg);
196 }
197
198 if (cpu_class_is_omap2()) {
199 u32 ccr;
200
201 ccr = p->dma_read(CCR, lch);
202 if (priority)
203 ccr |= (1 << 6);
204 else
205 ccr &= ~(1 << 6);
206 p->dma_write(ccr, CCR, lch);
207 }
208 }
209 EXPORT_SYMBOL(omap_set_dma_priority);
210
211 void omap_set_dma_transfer_params(int lch, int data_type, int elem_count,
212 int frame_count, int sync_mode,
213 int dma_trigger, int src_or_dst_synch)
214 {
215 u32 l;
216
217 l = p->dma_read(CSDP, lch);
218 l &= ~0x03;
219 l |= data_type;
220 p->dma_write(l, CSDP, lch);
221
222 if (cpu_class_is_omap1()) {
223 u16 ccr;
224
225 ccr = p->dma_read(CCR, lch);
226 ccr &= ~(1 << 5);
227 if (sync_mode == OMAP_DMA_SYNC_FRAME)
228 ccr |= 1 << 5;
229 p->dma_write(ccr, CCR, lch);
230
231 ccr = p->dma_read(CCR2, lch);
232 ccr &= ~(1 << 2);
233 if (sync_mode == OMAP_DMA_SYNC_BLOCK)
234 ccr |= 1 << 2;
235 p->dma_write(ccr, CCR2, lch);
236 }
237
238 if (cpu_class_is_omap2() && dma_trigger) {
239 u32 val;
240
241 val = p->dma_read(CCR, lch);
242
243 /* DMA_SYNCHRO_CONTROL_UPPER depends on the channel number */
244 val &= ~((1 << 23) | (3 << 19) | 0x1f);
245 val |= (dma_trigger & ~0x1f) << 14;
246 val |= dma_trigger & 0x1f;
247
248 if (sync_mode & OMAP_DMA_SYNC_FRAME)
249 val |= 1 << 5;
250 else
251 val &= ~(1 << 5);
252
253 if (sync_mode & OMAP_DMA_SYNC_BLOCK)
254 val |= 1 << 18;
255 else
256 val &= ~(1 << 18);
257
258 if (src_or_dst_synch == OMAP_DMA_DST_SYNC_PREFETCH) {
259 val &= ~(1 << 24); /* dest synch */
260 val |= (1 << 23); /* Prefetch */
261 } else if (src_or_dst_synch) {
262 val |= 1 << 24; /* source synch */
263 } else {
264 val &= ~(1 << 24); /* dest synch */
265 }
266 p->dma_write(val, CCR, lch);
267 }
268
269 p->dma_write(elem_count, CEN, lch);
270 p->dma_write(frame_count, CFN, lch);
271 }
272 EXPORT_SYMBOL(omap_set_dma_transfer_params);
273
274 void omap_set_dma_color_mode(int lch, enum omap_dma_color_mode mode, u32 color)
275 {
276 BUG_ON(omap_dma_in_1510_mode());
277
278 if (cpu_class_is_omap1()) {
279 u16 w;
280
281 w = p->dma_read(CCR2, lch);
282 w &= ~0x03;
283
284 switch (mode) {
285 case OMAP_DMA_CONSTANT_FILL:
286 w |= 0x01;
287 break;
288 case OMAP_DMA_TRANSPARENT_COPY:
289 w |= 0x02;
290 break;
291 case OMAP_DMA_COLOR_DIS:
292 break;
293 default:
294 BUG();
295 }
296 p->dma_write(w, CCR2, lch);
297
298 w = p->dma_read(LCH_CTRL, lch);
299 w &= ~0x0f;
300 /* Default is channel type 2D */
301 if (mode) {
302 p->dma_write(color, COLOR, lch);
303 w |= 1; /* Channel type G */
304 }
305 p->dma_write(w, LCH_CTRL, lch);
306 }
307
308 if (cpu_class_is_omap2()) {
309 u32 val;
310
311 val = p->dma_read(CCR, lch);
312 val &= ~((1 << 17) | (1 << 16));
313
314 switch (mode) {
315 case OMAP_DMA_CONSTANT_FILL:
316 val |= 1 << 16;
317 break;
318 case OMAP_DMA_TRANSPARENT_COPY:
319 val |= 1 << 17;
320 break;
321 case OMAP_DMA_COLOR_DIS:
322 break;
323 default:
324 BUG();
325 }
326 p->dma_write(val, CCR, lch);
327
328 color &= 0xffffff;
329 p->dma_write(color, COLOR, lch);
330 }
331 }
332 EXPORT_SYMBOL(omap_set_dma_color_mode);
333
334 void omap_set_dma_write_mode(int lch, enum omap_dma_write_mode mode)
335 {
336 if (cpu_class_is_omap2()) {
337 u32 csdp;
338
339 csdp = p->dma_read(CSDP, lch);
340 csdp &= ~(0x3 << 16);
341 csdp |= (mode << 16);
342 p->dma_write(csdp, CSDP, lch);
343 }
344 }
345 EXPORT_SYMBOL(omap_set_dma_write_mode);
346
347 void omap_set_dma_channel_mode(int lch, enum omap_dma_channel_mode mode)
348 {
349 if (cpu_class_is_omap1() && !cpu_is_omap15xx()) {
350 u32 l;
351
352 l = p->dma_read(LCH_CTRL, lch);
353 l &= ~0x7;
354 l |= mode;
355 p->dma_write(l, LCH_CTRL, lch);
356 }
357 }
358 EXPORT_SYMBOL(omap_set_dma_channel_mode);
359
360 /* Note that src_port is only for omap1 */
361 void omap_set_dma_src_params(int lch, int src_port, int src_amode,
362 unsigned long src_start,
363 int src_ei, int src_fi)
364 {
365 u32 l;
366
367 if (cpu_class_is_omap1()) {
368 u16 w;
369
370 w = p->dma_read(CSDP, lch);
371 w &= ~(0x1f << 2);
372 w |= src_port << 2;
373 p->dma_write(w, CSDP, lch);
374 }
375
376 l = p->dma_read(CCR, lch);
377 l &= ~(0x03 << 12);
378 l |= src_amode << 12;
379 p->dma_write(l, CCR, lch);
380
381 p->dma_write(src_start, CSSA, lch);
382
383 p->dma_write(src_ei, CSEI, lch);
384 p->dma_write(src_fi, CSFI, lch);
385 }
386 EXPORT_SYMBOL(omap_set_dma_src_params);
387
388 void omap_set_dma_params(int lch, struct omap_dma_channel_params *params)
389 {
390 omap_set_dma_transfer_params(lch, params->data_type,
391 params->elem_count, params->frame_count,
392 params->sync_mode, params->trigger,
393 params->src_or_dst_synch);
394 omap_set_dma_src_params(lch, params->src_port,
395 params->src_amode, params->src_start,
396 params->src_ei, params->src_fi);
397
398 omap_set_dma_dest_params(lch, params->dst_port,
399 params->dst_amode, params->dst_start,
400 params->dst_ei, params->dst_fi);
401 if (params->read_prio || params->write_prio)
402 omap_dma_set_prio_lch(lch, params->read_prio,
403 params->write_prio);
404 }
405 EXPORT_SYMBOL(omap_set_dma_params);
406
407 void omap_set_dma_src_index(int lch, int eidx, int fidx)
408 {
409 if (cpu_class_is_omap2())
410 return;
411
412 p->dma_write(eidx, CSEI, lch);
413 p->dma_write(fidx, CSFI, lch);
414 }
415 EXPORT_SYMBOL(omap_set_dma_src_index);
416
417 void omap_set_dma_src_data_pack(int lch, int enable)
418 {
419 u32 l;
420
421 l = p->dma_read(CSDP, lch);
422 l &= ~(1 << 6);
423 if (enable)
424 l |= (1 << 6);
425 p->dma_write(l, CSDP, lch);
426 }
427 EXPORT_SYMBOL(omap_set_dma_src_data_pack);
428
429 void omap_set_dma_src_burst_mode(int lch, enum omap_dma_burst_mode burst_mode)
430 {
431 unsigned int burst = 0;
432 u32 l;
433
434 l = p->dma_read(CSDP, lch);
435 l &= ~(0x03 << 7);
436
437 switch (burst_mode) {
438 case OMAP_DMA_DATA_BURST_DIS:
439 break;
440 case OMAP_DMA_DATA_BURST_4:
441 if (cpu_class_is_omap2())
442 burst = 0x1;
443 else
444 burst = 0x2;
445 break;
446 case OMAP_DMA_DATA_BURST_8:
447 if (cpu_class_is_omap2()) {
448 burst = 0x2;
449 break;
450 }
451 /*
452 * not supported by current hardware on OMAP1
453 * w |= (0x03 << 7);
454 * fall through
455 */
456 case OMAP_DMA_DATA_BURST_16:
457 if (cpu_class_is_omap2()) {
458 burst = 0x3;
459 break;
460 }
461 /*
462 * OMAP1 don't support burst 16
463 * fall through
464 */
465 default:
466 BUG();
467 }
468
469 l |= (burst << 7);
470 p->dma_write(l, CSDP, lch);
471 }
472 EXPORT_SYMBOL(omap_set_dma_src_burst_mode);
473
474 /* Note that dest_port is only for OMAP1 */
475 void omap_set_dma_dest_params(int lch, int dest_port, int dest_amode,
476 unsigned long dest_start,
477 int dst_ei, int dst_fi)
478 {
479 u32 l;
480
481 if (cpu_class_is_omap1()) {
482 l = p->dma_read(CSDP, lch);
483 l &= ~(0x1f << 9);
484 l |= dest_port << 9;
485 p->dma_write(l, CSDP, lch);
486 }
487
488 l = p->dma_read(CCR, lch);
489 l &= ~(0x03 << 14);
490 l |= dest_amode << 14;
491 p->dma_write(l, CCR, lch);
492
493 p->dma_write(dest_start, CDSA, lch);
494
495 p->dma_write(dst_ei, CDEI, lch);
496 p->dma_write(dst_fi, CDFI, lch);
497 }
498 EXPORT_SYMBOL(omap_set_dma_dest_params);
499
500 void omap_set_dma_dest_index(int lch, int eidx, int fidx)
501 {
502 if (cpu_class_is_omap2())
503 return;
504
505 p->dma_write(eidx, CDEI, lch);
506 p->dma_write(fidx, CDFI, lch);
507 }
508 EXPORT_SYMBOL(omap_set_dma_dest_index);
509
510 void omap_set_dma_dest_data_pack(int lch, int enable)
511 {
512 u32 l;
513
514 l = p->dma_read(CSDP, lch);
515 l &= ~(1 << 13);
516 if (enable)
517 l |= 1 << 13;
518 p->dma_write(l, CSDP, lch);
519 }
520 EXPORT_SYMBOL(omap_set_dma_dest_data_pack);
521
522 void omap_set_dma_dest_burst_mode(int lch, enum omap_dma_burst_mode burst_mode)
523 {
524 unsigned int burst = 0;
525 u32 l;
526
527 l = p->dma_read(CSDP, lch);
528 l &= ~(0x03 << 14);
529
530 switch (burst_mode) {
531 case OMAP_DMA_DATA_BURST_DIS:
532 break;
533 case OMAP_DMA_DATA_BURST_4:
534 if (cpu_class_is_omap2())
535 burst = 0x1;
536 else
537 burst = 0x2;
538 break;
539 case OMAP_DMA_DATA_BURST_8:
540 if (cpu_class_is_omap2())
541 burst = 0x2;
542 else
543 burst = 0x3;
544 break;
545 case OMAP_DMA_DATA_BURST_16:
546 if (cpu_class_is_omap2()) {
547 burst = 0x3;
548 break;
549 }
550 /*
551 * OMAP1 don't support burst 16
552 * fall through
553 */
554 default:
555 printk(KERN_ERR "Invalid DMA burst mode\n");
556 BUG();
557 return;
558 }
559 l |= (burst << 14);
560 p->dma_write(l, CSDP, lch);
561 }
562 EXPORT_SYMBOL(omap_set_dma_dest_burst_mode);
563
564 static inline void omap_enable_channel_irq(int lch)
565 {
566 u32 status;
567
568 /* Clear CSR */
569 if (cpu_class_is_omap1())
570 status = p->dma_read(CSR, lch);
571 else if (cpu_class_is_omap2())
572 p->dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR, lch);
573
574 /* Enable some nice interrupts. */
575 p->dma_write(dma_chan[lch].enabled_irqs, CICR, lch);
576 }
577
578 static void omap_disable_channel_irq(int lch)
579 {
580 if (cpu_class_is_omap2())
581 p->dma_write(0, CICR, lch);
582 }
583
584 void omap_enable_dma_irq(int lch, u16 bits)
585 {
586 dma_chan[lch].enabled_irqs |= bits;
587 }
588 EXPORT_SYMBOL(omap_enable_dma_irq);
589
590 void omap_disable_dma_irq(int lch, u16 bits)
591 {
592 dma_chan[lch].enabled_irqs &= ~bits;
593 }
594 EXPORT_SYMBOL(omap_disable_dma_irq);
595
596 static inline void enable_lnk(int lch)
597 {
598 u32 l;
599
600 l = p->dma_read(CLNK_CTRL, lch);
601
602 if (cpu_class_is_omap1())
603 l &= ~(1 << 14);
604
605 /* Set the ENABLE_LNK bits */
606 if (dma_chan[lch].next_lch != -1)
607 l = dma_chan[lch].next_lch | (1 << 15);
608
609 #ifndef CONFIG_ARCH_OMAP1
610 if (cpu_class_is_omap2())
611 if (dma_chan[lch].next_linked_ch != -1)
612 l = dma_chan[lch].next_linked_ch | (1 << 15);
613 #endif
614
615 p->dma_write(l, CLNK_CTRL, lch);
616 }
617
618 static inline void disable_lnk(int lch)
619 {
620 u32 l;
621
622 l = p->dma_read(CLNK_CTRL, lch);
623
624 /* Disable interrupts */
625 if (cpu_class_is_omap1()) {
626 p->dma_write(0, CICR, lch);
627 /* Set the STOP_LNK bit */
628 l |= 1 << 14;
629 }
630
631 if (cpu_class_is_omap2()) {
632 omap_disable_channel_irq(lch);
633 /* Clear the ENABLE_LNK bit */
634 l &= ~(1 << 15);
635 }
636
637 p->dma_write(l, CLNK_CTRL, lch);
638 dma_chan[lch].flags &= ~OMAP_DMA_ACTIVE;
639 }
640
641 static inline void omap2_enable_irq_lch(int lch)
642 {
643 u32 val;
644 unsigned long flags;
645
646 if (!cpu_class_is_omap2())
647 return;
648
649 spin_lock_irqsave(&dma_chan_lock, flags);
650 val = p->dma_read(IRQENABLE_L0, lch);
651 val |= 1 << lch;
652 p->dma_write(val, IRQENABLE_L0, lch);
653 spin_unlock_irqrestore(&dma_chan_lock, flags);
654 }
655
656 static inline void omap2_disable_irq_lch(int lch)
657 {
658 u32 val;
659 unsigned long flags;
660
661 if (!cpu_class_is_omap2())
662 return;
663
664 spin_lock_irqsave(&dma_chan_lock, flags);
665 val = p->dma_read(IRQENABLE_L0, lch);
666 val &= ~(1 << lch);
667 p->dma_write(val, IRQENABLE_L0, lch);
668 spin_unlock_irqrestore(&dma_chan_lock, flags);
669 }
670
671 int omap_request_dma(int dev_id, const char *dev_name,
672 void (*callback)(int lch, u16 ch_status, void *data),
673 void *data, int *dma_ch_out)
674 {
675 int ch, free_ch = -1;
676 unsigned long flags;
677 struct omap_dma_lch *chan;
678
679 spin_lock_irqsave(&dma_chan_lock, flags);
680 for (ch = 0; ch < dma_chan_count; ch++) {
681 if (free_ch == -1 && dma_chan[ch].dev_id == -1) {
682 free_ch = ch;
683 if (dev_id == 0)
684 break;
685 }
686 }
687 if (free_ch == -1) {
688 spin_unlock_irqrestore(&dma_chan_lock, flags);
689 return -EBUSY;
690 }
691 chan = dma_chan + free_ch;
692 chan->dev_id = dev_id;
693
694 if (p->clear_lch_regs)
695 p->clear_lch_regs(free_ch);
696
697 if (cpu_class_is_omap2())
698 omap_clear_dma(free_ch);
699
700 spin_unlock_irqrestore(&dma_chan_lock, flags);
701
702 chan->dev_name = dev_name;
703 chan->callback = callback;
704 chan->data = data;
705 chan->flags = 0;
706
707 #ifndef CONFIG_ARCH_OMAP1
708 if (cpu_class_is_omap2()) {
709 chan->chain_id = -1;
710 chan->next_linked_ch = -1;
711 }
712 #endif
713
714 chan->enabled_irqs = OMAP_DMA_DROP_IRQ | OMAP_DMA_BLOCK_IRQ;
715
716 if (cpu_class_is_omap1())
717 chan->enabled_irqs |= OMAP1_DMA_TOUT_IRQ;
718 else if (cpu_class_is_omap2())
719 chan->enabled_irqs |= OMAP2_DMA_MISALIGNED_ERR_IRQ |
720 OMAP2_DMA_TRANS_ERR_IRQ;
721
722 if (cpu_is_omap16xx()) {
723 /* If the sync device is set, configure it dynamically. */
724 if (dev_id != 0) {
725 set_gdma_dev(free_ch + 1, dev_id);
726 dev_id = free_ch + 1;
727 }
728 /*
729 * Disable the 1510 compatibility mode and set the sync device
730 * id.
731 */
732 p->dma_write(dev_id | (1 << 10), CCR, free_ch);
733 } else if (cpu_is_omap7xx() || cpu_is_omap15xx()) {
734 p->dma_write(dev_id, CCR, free_ch);
735 }
736
737 if (cpu_class_is_omap2()) {
738 omap2_enable_irq_lch(free_ch);
739 omap_enable_channel_irq(free_ch);
740 /* Clear the CSR register and IRQ status register */
741 p->dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR, free_ch);
742 p->dma_write(1 << free_ch, IRQSTATUS_L0, 0);
743 }
744
745 *dma_ch_out = free_ch;
746
747 return 0;
748 }
749 EXPORT_SYMBOL(omap_request_dma);
750
751 void omap_free_dma(int lch)
752 {
753 unsigned long flags;
754
755 if (dma_chan[lch].dev_id == -1) {
756 pr_err("omap_dma: trying to free unallocated DMA channel %d\n",
757 lch);
758 return;
759 }
760
761 if (cpu_class_is_omap1()) {
762 /* Disable all DMA interrupts for the channel. */
763 p->dma_write(0, CICR, lch);
764 /* Make sure the DMA transfer is stopped. */
765 p->dma_write(0, CCR, lch);
766 }
767
768 if (cpu_class_is_omap2()) {
769 omap2_disable_irq_lch(lch);
770
771 /* Clear the CSR register and IRQ status register */
772 p->dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR, lch);
773 p->dma_write(1 << lch, IRQSTATUS_L0, lch);
774
775 /* Disable all DMA interrupts for the channel. */
776 p->dma_write(0, CICR, lch);
777
778 /* Make sure the DMA transfer is stopped. */
779 p->dma_write(0, CCR, lch);
780 omap_clear_dma(lch);
781 }
782
783 spin_lock_irqsave(&dma_chan_lock, flags);
784 dma_chan[lch].dev_id = -1;
785 dma_chan[lch].next_lch = -1;
786 dma_chan[lch].callback = NULL;
787 spin_unlock_irqrestore(&dma_chan_lock, flags);
788 }
789 EXPORT_SYMBOL(omap_free_dma);
790
791 /**
792 * @brief omap_dma_set_global_params : Set global priority settings for dma
793 *
794 * @param arb_rate
795 * @param max_fifo_depth
796 * @param tparams - Number of threads to reserve : DMA_THREAD_RESERVE_NORM
797 * DMA_THREAD_RESERVE_ONET
798 * DMA_THREAD_RESERVE_TWOT
799 * DMA_THREAD_RESERVE_THREET
800 */
801 void
802 omap_dma_set_global_params(int arb_rate, int max_fifo_depth, int tparams)
803 {
804 u32 reg;
805
806 if (!cpu_class_is_omap2()) {
807 printk(KERN_ERR "FIXME: no %s on 15xx/16xx\n", __func__);
808 return;
809 }
810
811 if (max_fifo_depth == 0)
812 max_fifo_depth = 1;
813 if (arb_rate == 0)
814 arb_rate = 1;
815
816 reg = 0xff & max_fifo_depth;
817 reg |= (0x3 & tparams) << 12;
818 reg |= (arb_rate & 0xff) << 16;
819
820 p->dma_write(reg, GCR, 0);
821 }
822 EXPORT_SYMBOL(omap_dma_set_global_params);
823
824 /**
825 * @brief omap_dma_set_prio_lch : Set channel wise priority settings
826 *
827 * @param lch
828 * @param read_prio - Read priority
829 * @param write_prio - Write priority
830 * Both of the above can be set with one of the following values :
831 * DMA_CH_PRIO_HIGH/DMA_CH_PRIO_LOW
832 */
833 int
834 omap_dma_set_prio_lch(int lch, unsigned char read_prio,
835 unsigned char write_prio)
836 {
837 u32 l;
838
839 if (unlikely((lch < 0 || lch >= dma_lch_count))) {
840 printk(KERN_ERR "Invalid channel id\n");
841 return -EINVAL;
842 }
843 l = p->dma_read(CCR, lch);
844 l &= ~((1 << 6) | (1 << 26));
845 if (cpu_is_omap2430() || cpu_is_omap34xx() || cpu_is_omap44xx())
846 l |= ((read_prio & 0x1) << 6) | ((write_prio & 0x1) << 26);
847 else
848 l |= ((read_prio & 0x1) << 6);
849
850 p->dma_write(l, CCR, lch);
851
852 return 0;
853 }
854 EXPORT_SYMBOL(omap_dma_set_prio_lch);
855
856 /*
857 * Clears any DMA state so the DMA engine is ready to restart with new buffers
858 * through omap_start_dma(). Any buffers in flight are discarded.
859 */
860 void omap_clear_dma(int lch)
861 {
862 unsigned long flags;
863
864 local_irq_save(flags);
865 p->clear_dma(lch);
866 local_irq_restore(flags);
867 }
868 EXPORT_SYMBOL(omap_clear_dma);
869
870 void omap_start_dma(int lch)
871 {
872 u32 l;
873
874 /*
875 * The CPC/CDAC register needs to be initialized to zero
876 * before starting dma transfer.
877 */
878 if (cpu_is_omap15xx())
879 p->dma_write(0, CPC, lch);
880 else
881 p->dma_write(0, CDAC, lch);
882
883 if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) {
884 int next_lch, cur_lch;
885 char dma_chan_link_map[dma_lch_count];
886
887 dma_chan_link_map[lch] = 1;
888 /* Set the link register of the first channel */
889 enable_lnk(lch);
890
891 memset(dma_chan_link_map, 0, sizeof(dma_chan_link_map));
892 cur_lch = dma_chan[lch].next_lch;
893 do {
894 next_lch = dma_chan[cur_lch].next_lch;
895
896 /* The loop case: we've been here already */
897 if (dma_chan_link_map[cur_lch])
898 break;
899 /* Mark the current channel */
900 dma_chan_link_map[cur_lch] = 1;
901
902 enable_lnk(cur_lch);
903 omap_enable_channel_irq(cur_lch);
904
905 cur_lch = next_lch;
906 } while (next_lch != -1);
907 } else if (IS_DMA_ERRATA(DMA_ERRATA_PARALLEL_CHANNELS))
908 p->dma_write(lch, CLNK_CTRL, lch);
909
910 omap_enable_channel_irq(lch);
911
912 l = p->dma_read(CCR, lch);
913
914 if (IS_DMA_ERRATA(DMA_ERRATA_IFRAME_BUFFERING))
915 l |= OMAP_DMA_CCR_BUFFERING_DISABLE;
916 l |= OMAP_DMA_CCR_EN;
917
918 p->dma_write(l, CCR, lch);
919
920 dma_chan[lch].flags |= OMAP_DMA_ACTIVE;
921 }
922 EXPORT_SYMBOL(omap_start_dma);
923
924 void omap_stop_dma(int lch)
925 {
926 u32 l;
927
928 /* Disable all interrupts on the channel */
929 if (cpu_class_is_omap1())
930 p->dma_write(0, CICR, lch);
931
932 l = p->dma_read(CCR, lch);
933 if (IS_DMA_ERRATA(DMA_ERRATA_i541) &&
934 (l & OMAP_DMA_CCR_SEL_SRC_DST_SYNC)) {
935 int i = 0;
936 u32 sys_cf;
937
938 /* Configure No-Standby */
939 l = p->dma_read(OCP_SYSCONFIG, lch);
940 sys_cf = l;
941 l &= ~DMA_SYSCONFIG_MIDLEMODE_MASK;
942 l |= DMA_SYSCONFIG_MIDLEMODE(DMA_IDLEMODE_NO_IDLE);
943 p->dma_write(l , OCP_SYSCONFIG, 0);
944
945 l = p->dma_read(CCR, lch);
946 l &= ~OMAP_DMA_CCR_EN;
947 p->dma_write(l, CCR, lch);
948
949 /* Wait for sDMA FIFO drain */
950 l = p->dma_read(CCR, lch);
951 while (i < 100 && (l & (OMAP_DMA_CCR_RD_ACTIVE |
952 OMAP_DMA_CCR_WR_ACTIVE))) {
953 udelay(5);
954 i++;
955 l = p->dma_read(CCR, lch);
956 }
957 if (i >= 100)
958 printk(KERN_ERR "DMA drain did not complete on "
959 "lch %d\n", lch);
960 /* Restore OCP_SYSCONFIG */
961 p->dma_write(sys_cf, OCP_SYSCONFIG, lch);
962 } else {
963 l &= ~OMAP_DMA_CCR_EN;
964 p->dma_write(l, CCR, lch);
965 }
966
967 if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) {
968 int next_lch, cur_lch = lch;
969 char dma_chan_link_map[dma_lch_count];
970
971 memset(dma_chan_link_map, 0, sizeof(dma_chan_link_map));
972 do {
973 /* The loop case: we've been here already */
974 if (dma_chan_link_map[cur_lch])
975 break;
976 /* Mark the current channel */
977 dma_chan_link_map[cur_lch] = 1;
978
979 disable_lnk(cur_lch);
980
981 next_lch = dma_chan[cur_lch].next_lch;
982 cur_lch = next_lch;
983 } while (next_lch != -1);
984 }
985
986 dma_chan[lch].flags &= ~OMAP_DMA_ACTIVE;
987 }
988 EXPORT_SYMBOL(omap_stop_dma);
989
990 /*
991 * Allows changing the DMA callback function or data. This may be needed if
992 * the driver shares a single DMA channel for multiple dma triggers.
993 */
994 int omap_set_dma_callback(int lch,
995 void (*callback)(int lch, u16 ch_status, void *data),
996 void *data)
997 {
998 unsigned long flags;
999
1000 if (lch < 0)
1001 return -ENODEV;
1002
1003 spin_lock_irqsave(&dma_chan_lock, flags);
1004 if (dma_chan[lch].dev_id == -1) {
1005 printk(KERN_ERR "DMA callback for not set for free channel\n");
1006 spin_unlock_irqrestore(&dma_chan_lock, flags);
1007 return -EINVAL;
1008 }
1009 dma_chan[lch].callback = callback;
1010 dma_chan[lch].data = data;
1011 spin_unlock_irqrestore(&dma_chan_lock, flags);
1012
1013 return 0;
1014 }
1015 EXPORT_SYMBOL(omap_set_dma_callback);
1016
1017 /*
1018 * Returns current physical source address for the given DMA channel.
1019 * If the channel is running the caller must disable interrupts prior calling
1020 * this function and process the returned value before re-enabling interrupt to
1021 * prevent races with the interrupt handler. Note that in continuous mode there
1022 * is a chance for CSSA_L register overflow between the two reads resulting
1023 * in incorrect return value.
1024 */
1025 dma_addr_t omap_get_dma_src_pos(int lch)
1026 {
1027 dma_addr_t offset = 0;
1028
1029 if (cpu_is_omap15xx())
1030 offset = p->dma_read(CPC, lch);
1031 else
1032 offset = p->dma_read(CSAC, lch);
1033
1034 if (IS_DMA_ERRATA(DMA_ERRATA_3_3) && offset == 0)
1035 offset = p->dma_read(CSAC, lch);
1036
1037 if (cpu_class_is_omap1())
1038 offset |= (p->dma_read(CSSA, lch) & 0xFFFF0000);
1039
1040 return offset;
1041 }
1042 EXPORT_SYMBOL(omap_get_dma_src_pos);
1043
1044 /*
1045 * Returns current physical destination address for the given DMA channel.
1046 * If the channel is running the caller must disable interrupts prior calling
1047 * this function and process the returned value before re-enabling interrupt to
1048 * prevent races with the interrupt handler. Note that in continuous mode there
1049 * is a chance for CDSA_L register overflow between the two reads resulting
1050 * in incorrect return value.
1051 */
1052 dma_addr_t omap_get_dma_dst_pos(int lch)
1053 {
1054 dma_addr_t offset = 0;
1055
1056 if (cpu_is_omap15xx())
1057 offset = p->dma_read(CPC, lch);
1058 else
1059 offset = p->dma_read(CDAC, lch);
1060
1061 /*
1062 * omap 3.2/3.3 erratum: sometimes 0 is returned if CSAC/CDAC is
1063 * read before the DMA controller finished disabling the channel.
1064 */
1065 if (!cpu_is_omap15xx() && offset == 0)
1066 offset = p->dma_read(CDAC, lch);
1067
1068 if (cpu_class_is_omap1())
1069 offset |= (p->dma_read(CDSA, lch) & 0xFFFF0000);
1070
1071 return offset;
1072 }
1073 EXPORT_SYMBOL(omap_get_dma_dst_pos);
1074
1075 int omap_get_dma_active_status(int lch)
1076 {
1077 return (p->dma_read(CCR, lch) & OMAP_DMA_CCR_EN) != 0;
1078 }
1079 EXPORT_SYMBOL(omap_get_dma_active_status);
1080
1081 int omap_dma_running(void)
1082 {
1083 int lch;
1084
1085 if (cpu_class_is_omap1())
1086 if (omap_lcd_dma_running())
1087 return 1;
1088
1089 for (lch = 0; lch < dma_chan_count; lch++)
1090 if (p->dma_read(CCR, lch) & OMAP_DMA_CCR_EN)
1091 return 1;
1092
1093 return 0;
1094 }
1095
1096 /*
1097 * lch_queue DMA will start right after lch_head one is finished.
1098 * For this DMA link to start, you still need to start (see omap_start_dma)
1099 * the first one. That will fire up the entire queue.
1100 */
1101 void omap_dma_link_lch(int lch_head, int lch_queue)
1102 {
1103 if (omap_dma_in_1510_mode()) {
1104 if (lch_head == lch_queue) {
1105 p->dma_write(p->dma_read(CCR, lch_head) | (3 << 8),
1106 CCR, lch_head);
1107 return;
1108 }
1109 printk(KERN_ERR "DMA linking is not supported in 1510 mode\n");
1110 BUG();
1111 return;
1112 }
1113
1114 if ((dma_chan[lch_head].dev_id == -1) ||
1115 (dma_chan[lch_queue].dev_id == -1)) {
1116 printk(KERN_ERR "omap_dma: trying to link "
1117 "non requested channels\n");
1118 dump_stack();
1119 }
1120
1121 dma_chan[lch_head].next_lch = lch_queue;
1122 }
1123 EXPORT_SYMBOL(omap_dma_link_lch);
1124
1125 /*
1126 * Once the DMA queue is stopped, we can destroy it.
1127 */
1128 void omap_dma_unlink_lch(int lch_head, int lch_queue)
1129 {
1130 if (omap_dma_in_1510_mode()) {
1131 if (lch_head == lch_queue) {
1132 p->dma_write(p->dma_read(CCR, lch_head) & ~(3 << 8),
1133 CCR, lch_head);
1134 return;
1135 }
1136 printk(KERN_ERR "DMA linking is not supported in 1510 mode\n");
1137 BUG();
1138 return;
1139 }
1140
1141 if (dma_chan[lch_head].next_lch != lch_queue ||
1142 dma_chan[lch_head].next_lch == -1) {
1143 printk(KERN_ERR "omap_dma: trying to unlink "
1144 "non linked channels\n");
1145 dump_stack();
1146 }
1147
1148 if ((dma_chan[lch_head].flags & OMAP_DMA_ACTIVE) ||
1149 (dma_chan[lch_queue].flags & OMAP_DMA_ACTIVE)) {
1150 printk(KERN_ERR "omap_dma: You need to stop the DMA channels "
1151 "before unlinking\n");
1152 dump_stack();
1153 }
1154
1155 dma_chan[lch_head].next_lch = -1;
1156 }
1157 EXPORT_SYMBOL(omap_dma_unlink_lch);
1158
1159 #ifndef CONFIG_ARCH_OMAP1
1160 /* Create chain of DMA channesls */
1161 static void create_dma_lch_chain(int lch_head, int lch_queue)
1162 {
1163 u32 l;
1164
1165 /* Check if this is the first link in chain */
1166 if (dma_chan[lch_head].next_linked_ch == -1) {
1167 dma_chan[lch_head].next_linked_ch = lch_queue;
1168 dma_chan[lch_head].prev_linked_ch = lch_queue;
1169 dma_chan[lch_queue].next_linked_ch = lch_head;
1170 dma_chan[lch_queue].prev_linked_ch = lch_head;
1171 }
1172
1173 /* a link exists, link the new channel in circular chain */
1174 else {
1175 dma_chan[lch_queue].next_linked_ch =
1176 dma_chan[lch_head].next_linked_ch;
1177 dma_chan[lch_queue].prev_linked_ch = lch_head;
1178 dma_chan[lch_head].next_linked_ch = lch_queue;
1179 dma_chan[dma_chan[lch_queue].next_linked_ch].prev_linked_ch =
1180 lch_queue;
1181 }
1182
1183 l = p->dma_read(CLNK_CTRL, lch_head);
1184 l &= ~(0x1f);
1185 l |= lch_queue;
1186 p->dma_write(l, CLNK_CTRL, lch_head);
1187
1188 l = p->dma_read(CLNK_CTRL, lch_queue);
1189 l &= ~(0x1f);
1190 l |= (dma_chan[lch_queue].next_linked_ch);
1191 p->dma_write(l, CLNK_CTRL, lch_queue);
1192 }
1193
1194 /**
1195 * @brief omap_request_dma_chain : Request a chain of DMA channels
1196 *
1197 * @param dev_id - Device id using the dma channel
1198 * @param dev_name - Device name
1199 * @param callback - Call back function
1200 * @chain_id -
1201 * @no_of_chans - Number of channels requested
1202 * @chain_mode - Dynamic or static chaining : OMAP_DMA_STATIC_CHAIN
1203 * OMAP_DMA_DYNAMIC_CHAIN
1204 * @params - Channel parameters
1205 *
1206 * @return - Success : 0
1207 * Failure: -EINVAL/-ENOMEM
1208 */
1209 int omap_request_dma_chain(int dev_id, const char *dev_name,
1210 void (*callback) (int lch, u16 ch_status,
1211 void *data),
1212 int *chain_id, int no_of_chans, int chain_mode,
1213 struct omap_dma_channel_params params)
1214 {
1215 int *channels;
1216 int i, err;
1217
1218 /* Is the chain mode valid ? */
1219 if (chain_mode != OMAP_DMA_STATIC_CHAIN
1220 && chain_mode != OMAP_DMA_DYNAMIC_CHAIN) {
1221 printk(KERN_ERR "Invalid chain mode requested\n");
1222 return -EINVAL;
1223 }
1224
1225 if (unlikely((no_of_chans < 1
1226 || no_of_chans > dma_lch_count))) {
1227 printk(KERN_ERR "Invalid Number of channels requested\n");
1228 return -EINVAL;
1229 }
1230
1231 /*
1232 * Allocate a queue to maintain the status of the channels
1233 * in the chain
1234 */
1235 channels = kmalloc(sizeof(*channels) * no_of_chans, GFP_KERNEL);
1236 if (channels == NULL) {
1237 printk(KERN_ERR "omap_dma: No memory for channel queue\n");
1238 return -ENOMEM;
1239 }
1240
1241 /* request and reserve DMA channels for the chain */
1242 for (i = 0; i < no_of_chans; i++) {
1243 err = omap_request_dma(dev_id, dev_name,
1244 callback, NULL, &channels[i]);
1245 if (err < 0) {
1246 int j;
1247 for (j = 0; j < i; j++)
1248 omap_free_dma(channels[j]);
1249 kfree(channels);
1250 printk(KERN_ERR "omap_dma: Request failed %d\n", err);
1251 return err;
1252 }
1253 dma_chan[channels[i]].prev_linked_ch = -1;
1254 dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
1255
1256 /*
1257 * Allowing client drivers to set common parameters now,
1258 * so that later only relevant (src_start, dest_start
1259 * and element count) can be set
1260 */
1261 omap_set_dma_params(channels[i], &params);
1262 }
1263
1264 *chain_id = channels[0];
1265 dma_linked_lch[*chain_id].linked_dmach_q = channels;
1266 dma_linked_lch[*chain_id].chain_mode = chain_mode;
1267 dma_linked_lch[*chain_id].chain_state = DMA_CHAIN_NOTSTARTED;
1268 dma_linked_lch[*chain_id].no_of_lchs_linked = no_of_chans;
1269
1270 for (i = 0; i < no_of_chans; i++)
1271 dma_chan[channels[i]].chain_id = *chain_id;
1272
1273 /* Reset the Queue pointers */
1274 OMAP_DMA_CHAIN_QINIT(*chain_id);
1275
1276 /* Set up the chain */
1277 if (no_of_chans == 1)
1278 create_dma_lch_chain(channels[0], channels[0]);
1279 else {
1280 for (i = 0; i < (no_of_chans - 1); i++)
1281 create_dma_lch_chain(channels[i], channels[i + 1]);
1282 }
1283
1284 return 0;
1285 }
1286 EXPORT_SYMBOL(omap_request_dma_chain);
1287
1288 /**
1289 * @brief omap_modify_dma_chain_param : Modify the chain's params - Modify the
1290 * params after setting it. Dont do this while dma is running!!
1291 *
1292 * @param chain_id - Chained logical channel id.
1293 * @param params
1294 *
1295 * @return - Success : 0
1296 * Failure : -EINVAL
1297 */
1298 int omap_modify_dma_chain_params(int chain_id,
1299 struct omap_dma_channel_params params)
1300 {
1301 int *channels;
1302 u32 i;
1303
1304 /* Check for input params */
1305 if (unlikely((chain_id < 0
1306 || chain_id >= dma_lch_count))) {
1307 printk(KERN_ERR "Invalid chain id\n");
1308 return -EINVAL;
1309 }
1310
1311 /* Check if the chain exists */
1312 if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1313 printk(KERN_ERR "Chain doesn't exists\n");
1314 return -EINVAL;
1315 }
1316 channels = dma_linked_lch[chain_id].linked_dmach_q;
1317
1318 for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
1319 /*
1320 * Allowing client drivers to set common parameters now,
1321 * so that later only relevant (src_start, dest_start
1322 * and element count) can be set
1323 */
1324 omap_set_dma_params(channels[i], &params);
1325 }
1326
1327 return 0;
1328 }
1329 EXPORT_SYMBOL(omap_modify_dma_chain_params);
1330
1331 /**
1332 * @brief omap_free_dma_chain - Free all the logical channels in a chain.
1333 *
1334 * @param chain_id
1335 *
1336 * @return - Success : 0
1337 * Failure : -EINVAL
1338 */
1339 int omap_free_dma_chain(int chain_id)
1340 {
1341 int *channels;
1342 u32 i;
1343
1344 /* Check for input params */
1345 if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1346 printk(KERN_ERR "Invalid chain id\n");
1347 return -EINVAL;
1348 }
1349
1350 /* Check if the chain exists */
1351 if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1352 printk(KERN_ERR "Chain doesn't exists\n");
1353 return -EINVAL;
1354 }
1355
1356 channels = dma_linked_lch[chain_id].linked_dmach_q;
1357 for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
1358 dma_chan[channels[i]].next_linked_ch = -1;
1359 dma_chan[channels[i]].prev_linked_ch = -1;
1360 dma_chan[channels[i]].chain_id = -1;
1361 dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
1362 omap_free_dma(channels[i]);
1363 }
1364
1365 kfree(channels);
1366
1367 dma_linked_lch[chain_id].linked_dmach_q = NULL;
1368 dma_linked_lch[chain_id].chain_mode = -1;
1369 dma_linked_lch[chain_id].chain_state = -1;
1370
1371 return (0);
1372 }
1373 EXPORT_SYMBOL(omap_free_dma_chain);
1374
1375 /**
1376 * @brief omap_dma_chain_status - Check if the chain is in
1377 * active / inactive state.
1378 * @param chain_id
1379 *
1380 * @return - Success : OMAP_DMA_CHAIN_ACTIVE/OMAP_DMA_CHAIN_INACTIVE
1381 * Failure : -EINVAL
1382 */
1383 int omap_dma_chain_status(int chain_id)
1384 {
1385 /* Check for input params */
1386 if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1387 printk(KERN_ERR "Invalid chain id\n");
1388 return -EINVAL;
1389 }
1390
1391 /* Check if the chain exists */
1392 if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1393 printk(KERN_ERR "Chain doesn't exists\n");
1394 return -EINVAL;
1395 }
1396 pr_debug("CHAINID=%d, qcnt=%d\n", chain_id,
1397 dma_linked_lch[chain_id].q_count);
1398
1399 if (OMAP_DMA_CHAIN_QEMPTY(chain_id))
1400 return OMAP_DMA_CHAIN_INACTIVE;
1401
1402 return OMAP_DMA_CHAIN_ACTIVE;
1403 }
1404 EXPORT_SYMBOL(omap_dma_chain_status);
1405
1406 /**
1407 * @brief omap_dma_chain_a_transfer - Get a free channel from a chain,
1408 * set the params and start the transfer.
1409 *
1410 * @param chain_id
1411 * @param src_start - buffer start address
1412 * @param dest_start - Dest address
1413 * @param elem_count
1414 * @param frame_count
1415 * @param callbk_data - channel callback parameter data.
1416 *
1417 * @return - Success : 0
1418 * Failure: -EINVAL/-EBUSY
1419 */
1420 int omap_dma_chain_a_transfer(int chain_id, int src_start, int dest_start,
1421 int elem_count, int frame_count, void *callbk_data)
1422 {
1423 int *channels;
1424 u32 l, lch;
1425 int start_dma = 0;
1426
1427 /*
1428 * if buffer size is less than 1 then there is
1429 * no use of starting the chain
1430 */
1431 if (elem_count < 1) {
1432 printk(KERN_ERR "Invalid buffer size\n");
1433 return -EINVAL;
1434 }
1435
1436 /* Check for input params */
1437 if (unlikely((chain_id < 0
1438 || chain_id >= dma_lch_count))) {
1439 printk(KERN_ERR "Invalid chain id\n");
1440 return -EINVAL;
1441 }
1442
1443 /* Check if the chain exists */
1444 if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1445 printk(KERN_ERR "Chain doesn't exist\n");
1446 return -EINVAL;
1447 }
1448
1449 /* Check if all the channels in chain are in use */
1450 if (OMAP_DMA_CHAIN_QFULL(chain_id))
1451 return -EBUSY;
1452
1453 /* Frame count may be negative in case of indexed transfers */
1454 channels = dma_linked_lch[chain_id].linked_dmach_q;
1455
1456 /* Get a free channel */
1457 lch = channels[dma_linked_lch[chain_id].q_tail];
1458
1459 /* Store the callback data */
1460 dma_chan[lch].data = callbk_data;
1461
1462 /* Increment the q_tail */
1463 OMAP_DMA_CHAIN_INCQTAIL(chain_id);
1464
1465 /* Set the params to the free channel */
1466 if (src_start != 0)
1467 p->dma_write(src_start, CSSA, lch);
1468 if (dest_start != 0)
1469 p->dma_write(dest_start, CDSA, lch);
1470
1471 /* Write the buffer size */
1472 p->dma_write(elem_count, CEN, lch);
1473 p->dma_write(frame_count, CFN, lch);
1474
1475 /*
1476 * If the chain is dynamically linked,
1477 * then we may have to start the chain if its not active
1478 */
1479 if (dma_linked_lch[chain_id].chain_mode == OMAP_DMA_DYNAMIC_CHAIN) {
1480
1481 /*
1482 * In Dynamic chain, if the chain is not started,
1483 * queue the channel
1484 */
1485 if (dma_linked_lch[chain_id].chain_state ==
1486 DMA_CHAIN_NOTSTARTED) {
1487 /* Enable the link in previous channel */
1488 if (dma_chan[dma_chan[lch].prev_linked_ch].state ==
1489 DMA_CH_QUEUED)
1490 enable_lnk(dma_chan[lch].prev_linked_ch);
1491 dma_chan[lch].state = DMA_CH_QUEUED;
1492 }
1493
1494 /*
1495 * Chain is already started, make sure its active,
1496 * if not then start the chain
1497 */
1498 else {
1499 start_dma = 1;
1500
1501 if (dma_chan[dma_chan[lch].prev_linked_ch].state ==
1502 DMA_CH_STARTED) {
1503 enable_lnk(dma_chan[lch].prev_linked_ch);
1504 dma_chan[lch].state = DMA_CH_QUEUED;
1505 start_dma = 0;
1506 if (0 == ((1 << 7) & p->dma_read(
1507 CCR, dma_chan[lch].prev_linked_ch))) {
1508 disable_lnk(dma_chan[lch].
1509 prev_linked_ch);
1510 pr_debug("\n prev ch is stopped\n");
1511 start_dma = 1;
1512 }
1513 }
1514
1515 else if (dma_chan[dma_chan[lch].prev_linked_ch].state
1516 == DMA_CH_QUEUED) {
1517 enable_lnk(dma_chan[lch].prev_linked_ch);
1518 dma_chan[lch].state = DMA_CH_QUEUED;
1519 start_dma = 0;
1520 }
1521 omap_enable_channel_irq(lch);
1522
1523 l = p->dma_read(CCR, lch);
1524
1525 if ((0 == (l & (1 << 24))))
1526 l &= ~(1 << 25);
1527 else
1528 l |= (1 << 25);
1529 if (start_dma == 1) {
1530 if (0 == (l & (1 << 7))) {
1531 l |= (1 << 7);
1532 dma_chan[lch].state = DMA_CH_STARTED;
1533 pr_debug("starting %d\n", lch);
1534 p->dma_write(l, CCR, lch);
1535 } else
1536 start_dma = 0;
1537 } else {
1538 if (0 == (l & (1 << 7)))
1539 p->dma_write(l, CCR, lch);
1540 }
1541 dma_chan[lch].flags |= OMAP_DMA_ACTIVE;
1542 }
1543 }
1544
1545 return 0;
1546 }
1547 EXPORT_SYMBOL(omap_dma_chain_a_transfer);
1548
1549 /**
1550 * @brief omap_start_dma_chain_transfers - Start the chain
1551 *
1552 * @param chain_id
1553 *
1554 * @return - Success : 0
1555 * Failure : -EINVAL/-EBUSY
1556 */
1557 int omap_start_dma_chain_transfers(int chain_id)
1558 {
1559 int *channels;
1560 u32 l, i;
1561
1562 if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1563 printk(KERN_ERR "Invalid chain id\n");
1564 return -EINVAL;
1565 }
1566
1567 channels = dma_linked_lch[chain_id].linked_dmach_q;
1568
1569 if (dma_linked_lch[channels[0]].chain_state == DMA_CHAIN_STARTED) {
1570 printk(KERN_ERR "Chain is already started\n");
1571 return -EBUSY;
1572 }
1573
1574 if (dma_linked_lch[chain_id].chain_mode == OMAP_DMA_STATIC_CHAIN) {
1575 for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked;
1576 i++) {
1577 enable_lnk(channels[i]);
1578 omap_enable_channel_irq(channels[i]);
1579 }
1580 } else {
1581 omap_enable_channel_irq(channels[0]);
1582 }
1583
1584 l = p->dma_read(CCR, channels[0]);
1585 l |= (1 << 7);
1586 dma_linked_lch[chain_id].chain_state = DMA_CHAIN_STARTED;
1587 dma_chan[channels[0]].state = DMA_CH_STARTED;
1588
1589 if ((0 == (l & (1 << 24))))
1590 l &= ~(1 << 25);
1591 else
1592 l |= (1 << 25);
1593 p->dma_write(l, CCR, channels[0]);
1594
1595 dma_chan[channels[0]].flags |= OMAP_DMA_ACTIVE;
1596
1597 return 0;
1598 }
1599 EXPORT_SYMBOL(omap_start_dma_chain_transfers);
1600
1601 /**
1602 * @brief omap_stop_dma_chain_transfers - Stop the dma transfer of a chain.
1603 *
1604 * @param chain_id
1605 *
1606 * @return - Success : 0
1607 * Failure : EINVAL
1608 */
1609 int omap_stop_dma_chain_transfers(int chain_id)
1610 {
1611 int *channels;
1612 u32 l, i;
1613 u32 sys_cf = 0;
1614
1615 /* Check for input params */
1616 if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1617 printk(KERN_ERR "Invalid chain id\n");
1618 return -EINVAL;
1619 }
1620
1621 /* Check if the chain exists */
1622 if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1623 printk(KERN_ERR "Chain doesn't exists\n");
1624 return -EINVAL;
1625 }
1626 channels = dma_linked_lch[chain_id].linked_dmach_q;
1627
1628 if (IS_DMA_ERRATA(DMA_ERRATA_i88)) {
1629 sys_cf = p->dma_read(OCP_SYSCONFIG, 0);
1630 l = sys_cf;
1631 /* Middle mode reg set no Standby */
1632 l &= ~((1 << 12)|(1 << 13));
1633 p->dma_write(l, OCP_SYSCONFIG, 0);
1634 }
1635
1636 for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
1637
1638 /* Stop the Channel transmission */
1639 l = p->dma_read(CCR, channels[i]);
1640 l &= ~(1 << 7);
1641 p->dma_write(l, CCR, channels[i]);
1642
1643 /* Disable the link in all the channels */
1644 disable_lnk(channels[i]);
1645 dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
1646
1647 }
1648 dma_linked_lch[chain_id].chain_state = DMA_CHAIN_NOTSTARTED;
1649
1650 /* Reset the Queue pointers */
1651 OMAP_DMA_CHAIN_QINIT(chain_id);
1652
1653 if (IS_DMA_ERRATA(DMA_ERRATA_i88))
1654 p->dma_write(sys_cf, OCP_SYSCONFIG, 0);
1655
1656 return 0;
1657 }
1658 EXPORT_SYMBOL(omap_stop_dma_chain_transfers);
1659
1660 /* Get the index of the ongoing DMA in chain */
1661 /**
1662 * @brief omap_get_dma_chain_index - Get the element and frame index
1663 * of the ongoing DMA in chain
1664 *
1665 * @param chain_id
1666 * @param ei - Element index
1667 * @param fi - Frame index
1668 *
1669 * @return - Success : 0
1670 * Failure : -EINVAL
1671 */
1672 int omap_get_dma_chain_index(int chain_id, int *ei, int *fi)
1673 {
1674 int lch;
1675 int *channels;
1676
1677 /* Check for input params */
1678 if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1679 printk(KERN_ERR "Invalid chain id\n");
1680 return -EINVAL;
1681 }
1682
1683 /* Check if the chain exists */
1684 if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1685 printk(KERN_ERR "Chain doesn't exists\n");
1686 return -EINVAL;
1687 }
1688 if ((!ei) || (!fi))
1689 return -EINVAL;
1690
1691 channels = dma_linked_lch[chain_id].linked_dmach_q;
1692
1693 /* Get the current channel */
1694 lch = channels[dma_linked_lch[chain_id].q_head];
1695
1696 *ei = p->dma_read(CCEN, lch);
1697 *fi = p->dma_read(CCFN, lch);
1698
1699 return 0;
1700 }
1701 EXPORT_SYMBOL(omap_get_dma_chain_index);
1702
1703 /**
1704 * @brief omap_get_dma_chain_dst_pos - Get the destination position of the
1705 * ongoing DMA in chain
1706 *
1707 * @param chain_id
1708 *
1709 * @return - Success : Destination position
1710 * Failure : -EINVAL
1711 */
1712 int omap_get_dma_chain_dst_pos(int chain_id)
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
1729 channels = dma_linked_lch[chain_id].linked_dmach_q;
1730
1731 /* Get the current channel */
1732 lch = channels[dma_linked_lch[chain_id].q_head];
1733
1734 return p->dma_read(CDAC, lch);
1735 }
1736 EXPORT_SYMBOL(omap_get_dma_chain_dst_pos);
1737
1738 /**
1739 * @brief omap_get_dma_chain_src_pos - Get the source position
1740 * of the ongoing DMA in chain
1741 * @param chain_id
1742 *
1743 * @return - Success : Destination position
1744 * Failure : -EINVAL
1745 */
1746 int omap_get_dma_chain_src_pos(int chain_id)
1747 {
1748 int lch;
1749 int *channels;
1750
1751 /* Check for input params */
1752 if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1753 printk(KERN_ERR "Invalid chain id\n");
1754 return -EINVAL;
1755 }
1756
1757 /* Check if the chain exists */
1758 if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1759 printk(KERN_ERR "Chain doesn't exists\n");
1760 return -EINVAL;
1761 }
1762
1763 channels = dma_linked_lch[chain_id].linked_dmach_q;
1764
1765 /* Get the current channel */
1766 lch = channels[dma_linked_lch[chain_id].q_head];
1767
1768 return p->dma_read(CSAC, lch);
1769 }
1770 EXPORT_SYMBOL(omap_get_dma_chain_src_pos);
1771 #endif /* ifndef CONFIG_ARCH_OMAP1 */
1772
1773 /*----------------------------------------------------------------------------*/
1774
1775 #ifdef CONFIG_ARCH_OMAP1
1776
1777 static int omap1_dma_handle_ch(int ch)
1778 {
1779 u32 csr;
1780
1781 if (enable_1510_mode && ch >= 6) {
1782 csr = dma_chan[ch].saved_csr;
1783 dma_chan[ch].saved_csr = 0;
1784 } else
1785 csr = p->dma_read(CSR, ch);
1786 if (enable_1510_mode && ch <= 2 && (csr >> 7) != 0) {
1787 dma_chan[ch + 6].saved_csr = csr >> 7;
1788 csr &= 0x7f;
1789 }
1790 if ((csr & 0x3f) == 0)
1791 return 0;
1792 if (unlikely(dma_chan[ch].dev_id == -1)) {
1793 printk(KERN_WARNING "Spurious interrupt from DMA channel "
1794 "%d (CSR %04x)\n", ch, csr);
1795 return 0;
1796 }
1797 if (unlikely(csr & OMAP1_DMA_TOUT_IRQ))
1798 printk(KERN_WARNING "DMA timeout with device %d\n",
1799 dma_chan[ch].dev_id);
1800 if (unlikely(csr & OMAP_DMA_DROP_IRQ))
1801 printk(KERN_WARNING "DMA synchronization event drop occurred "
1802 "with device %d\n", dma_chan[ch].dev_id);
1803 if (likely(csr & OMAP_DMA_BLOCK_IRQ))
1804 dma_chan[ch].flags &= ~OMAP_DMA_ACTIVE;
1805 if (likely(dma_chan[ch].callback != NULL))
1806 dma_chan[ch].callback(ch, csr, dma_chan[ch].data);
1807
1808 return 1;
1809 }
1810
1811 static irqreturn_t omap1_dma_irq_handler(int irq, void *dev_id)
1812 {
1813 int ch = ((int) dev_id) - 1;
1814 int handled = 0;
1815
1816 for (;;) {
1817 int handled_now = 0;
1818
1819 handled_now += omap1_dma_handle_ch(ch);
1820 if (enable_1510_mode && dma_chan[ch + 6].saved_csr)
1821 handled_now += omap1_dma_handle_ch(ch + 6);
1822 if (!handled_now)
1823 break;
1824 handled += handled_now;
1825 }
1826
1827 return handled ? IRQ_HANDLED : IRQ_NONE;
1828 }
1829
1830 #else
1831 #define omap1_dma_irq_handler NULL
1832 #endif
1833
1834 #ifdef CONFIG_ARCH_OMAP2PLUS
1835
1836 static int omap2_dma_handle_ch(int ch)
1837 {
1838 u32 status = p->dma_read(CSR, ch);
1839
1840 if (!status) {
1841 if (printk_ratelimit())
1842 printk(KERN_WARNING "Spurious DMA IRQ for lch %d\n",
1843 ch);
1844 p->dma_write(1 << ch, IRQSTATUS_L0, ch);
1845 return 0;
1846 }
1847 if (unlikely(dma_chan[ch].dev_id == -1)) {
1848 if (printk_ratelimit())
1849 printk(KERN_WARNING "IRQ %04x for non-allocated DMA"
1850 "channel %d\n", status, ch);
1851 return 0;
1852 }
1853 if (unlikely(status & OMAP_DMA_DROP_IRQ))
1854 printk(KERN_INFO
1855 "DMA synchronization event drop occurred with device "
1856 "%d\n", dma_chan[ch].dev_id);
1857 if (unlikely(status & OMAP2_DMA_TRANS_ERR_IRQ)) {
1858 printk(KERN_INFO "DMA transaction error with device %d\n",
1859 dma_chan[ch].dev_id);
1860 if (IS_DMA_ERRATA(DMA_ERRATA_i378)) {
1861 u32 ccr;
1862
1863 ccr = p->dma_read(CCR, ch);
1864 ccr &= ~OMAP_DMA_CCR_EN;
1865 p->dma_write(ccr, CCR, ch);
1866 dma_chan[ch].flags &= ~OMAP_DMA_ACTIVE;
1867 }
1868 }
1869 if (unlikely(status & OMAP2_DMA_SECURE_ERR_IRQ))
1870 printk(KERN_INFO "DMA secure error with device %d\n",
1871 dma_chan[ch].dev_id);
1872 if (unlikely(status & OMAP2_DMA_MISALIGNED_ERR_IRQ))
1873 printk(KERN_INFO "DMA misaligned error with device %d\n",
1874 dma_chan[ch].dev_id);
1875
1876 p->dma_write(status, CSR, ch);
1877 p->dma_write(1 << ch, IRQSTATUS_L0, ch);
1878 /* read back the register to flush the write */
1879 p->dma_read(IRQSTATUS_L0, ch);
1880
1881 /* If the ch is not chained then chain_id will be -1 */
1882 if (dma_chan[ch].chain_id != -1) {
1883 int chain_id = dma_chan[ch].chain_id;
1884 dma_chan[ch].state = DMA_CH_NOTSTARTED;
1885 if (p->dma_read(CLNK_CTRL, ch) & (1 << 15))
1886 dma_chan[dma_chan[ch].next_linked_ch].state =
1887 DMA_CH_STARTED;
1888 if (dma_linked_lch[chain_id].chain_mode ==
1889 OMAP_DMA_DYNAMIC_CHAIN)
1890 disable_lnk(ch);
1891
1892 if (!OMAP_DMA_CHAIN_QEMPTY(chain_id))
1893 OMAP_DMA_CHAIN_INCQHEAD(chain_id);
1894
1895 status = p->dma_read(CSR, ch);
1896 p->dma_write(status, CSR, ch);
1897 }
1898
1899 if (likely(dma_chan[ch].callback != NULL))
1900 dma_chan[ch].callback(ch, status, dma_chan[ch].data);
1901
1902 return 0;
1903 }
1904
1905 /* STATUS register count is from 1-32 while our is 0-31 */
1906 static irqreturn_t omap2_dma_irq_handler(int irq, void *dev_id)
1907 {
1908 u32 val, enable_reg;
1909 int i;
1910
1911 val = p->dma_read(IRQSTATUS_L0, 0);
1912 if (val == 0) {
1913 if (printk_ratelimit())
1914 printk(KERN_WARNING "Spurious DMA IRQ\n");
1915 return IRQ_HANDLED;
1916 }
1917 enable_reg = p->dma_read(IRQENABLE_L0, 0);
1918 val &= enable_reg; /* Dispatch only relevant interrupts */
1919 for (i = 0; i < dma_lch_count && val != 0; i++) {
1920 if (val & 1)
1921 omap2_dma_handle_ch(i);
1922 val >>= 1;
1923 }
1924
1925 return IRQ_HANDLED;
1926 }
1927
1928 static struct irqaction omap24xx_dma_irq = {
1929 .name = "DMA",
1930 .handler = omap2_dma_irq_handler,
1931 .flags = IRQF_DISABLED
1932 };
1933
1934 #else
1935 static struct irqaction omap24xx_dma_irq;
1936 #endif
1937
1938 /*----------------------------------------------------------------------------*/
1939
1940 void omap_dma_global_context_save(void)
1941 {
1942 omap_dma_global_context.dma_irqenable_l0 =
1943 p->dma_read(IRQENABLE_L0, 0);
1944 omap_dma_global_context.dma_ocp_sysconfig =
1945 p->dma_read(OCP_SYSCONFIG, 0);
1946 omap_dma_global_context.dma_gcr = p->dma_read(GCR, 0);
1947 }
1948
1949 void omap_dma_global_context_restore(void)
1950 {
1951 int ch;
1952
1953 p->dma_write(omap_dma_global_context.dma_gcr, GCR, 0);
1954 p->dma_write(omap_dma_global_context.dma_ocp_sysconfig,
1955 OCP_SYSCONFIG, 0);
1956 p->dma_write(omap_dma_global_context.dma_irqenable_l0,
1957 IRQENABLE_L0, 0);
1958
1959 if (IS_DMA_ERRATA(DMA_ROMCODE_BUG))
1960 p->dma_write(0x3 , IRQSTATUS_L0, 0);
1961
1962 for (ch = 0; ch < dma_chan_count; ch++)
1963 if (dma_chan[ch].dev_id != -1)
1964 omap_clear_dma(ch);
1965 }
1966
1967 static int __devinit omap_system_dma_probe(struct platform_device *pdev)
1968 {
1969 int ch, ret = 0;
1970 int dma_irq;
1971 char irq_name[4];
1972 int irq_rel;
1973
1974 p = pdev->dev.platform_data;
1975 if (!p) {
1976 dev_err(&pdev->dev, "%s: System DMA initialized without"
1977 "platform data\n", __func__);
1978 return -EINVAL;
1979 }
1980
1981 d = p->dma_attr;
1982 errata = p->errata;
1983
1984 if ((d->dev_caps & RESERVE_CHANNEL) && omap_dma_reserve_channels
1985 && (omap_dma_reserve_channels <= dma_lch_count))
1986 d->lch_count = omap_dma_reserve_channels;
1987
1988 dma_lch_count = d->lch_count;
1989 dma_chan_count = dma_lch_count;
1990 dma_chan = d->chan;
1991 enable_1510_mode = d->dev_caps & ENABLE_1510_MODE;
1992
1993 if (cpu_class_is_omap2()) {
1994 dma_linked_lch = kzalloc(sizeof(struct dma_link_info) *
1995 dma_lch_count, GFP_KERNEL);
1996 if (!dma_linked_lch) {
1997 ret = -ENOMEM;
1998 goto exit_dma_lch_fail;
1999 }
2000 }
2001
2002 spin_lock_init(&dma_chan_lock);
2003 for (ch = 0; ch < dma_chan_count; ch++) {
2004 omap_clear_dma(ch);
2005 if (cpu_class_is_omap2())
2006 omap2_disable_irq_lch(ch);
2007
2008 dma_chan[ch].dev_id = -1;
2009 dma_chan[ch].next_lch = -1;
2010
2011 if (ch >= 6 && enable_1510_mode)
2012 continue;
2013
2014 if (cpu_class_is_omap1()) {
2015 /*
2016 * request_irq() doesn't like dev_id (ie. ch) being
2017 * zero, so we have to kludge around this.
2018 */
2019 sprintf(&irq_name[0], "%d", ch);
2020 dma_irq = platform_get_irq_byname(pdev, irq_name);
2021
2022 if (dma_irq < 0) {
2023 ret = dma_irq;
2024 goto exit_dma_irq_fail;
2025 }
2026
2027 /* INT_DMA_LCD is handled in lcd_dma.c */
2028 if (dma_irq == INT_DMA_LCD)
2029 continue;
2030
2031 ret = request_irq(dma_irq,
2032 omap1_dma_irq_handler, 0, "DMA",
2033 (void *) (ch + 1));
2034 if (ret != 0)
2035 goto exit_dma_irq_fail;
2036 }
2037 }
2038
2039 if (cpu_is_omap2430() || cpu_is_omap34xx() || cpu_is_omap44xx())
2040 omap_dma_set_global_params(DMA_DEFAULT_ARB_RATE,
2041 DMA_DEFAULT_FIFO_DEPTH, 0);
2042
2043 if (cpu_class_is_omap2()) {
2044 strcpy(irq_name, "0");
2045 dma_irq = platform_get_irq_byname(pdev, irq_name);
2046 if (dma_irq < 0) {
2047 dev_err(&pdev->dev, "failed: request IRQ %d", dma_irq);
2048 goto exit_dma_lch_fail;
2049 }
2050 ret = setup_irq(dma_irq, &omap24xx_dma_irq);
2051 if (ret) {
2052 dev_err(&pdev->dev, "set_up failed for IRQ %d"
2053 "for DMA (error %d)\n", dma_irq, ret);
2054 goto exit_dma_lch_fail;
2055 }
2056 }
2057
2058 /* reserve dma channels 0 and 1 in high security devices */
2059 if (cpu_is_omap34xx() &&
2060 (omap_type() != OMAP2_DEVICE_TYPE_GP)) {
2061 printk(KERN_INFO "Reserving DMA channels 0 and 1 for "
2062 "HS ROM code\n");
2063 dma_chan[0].dev_id = 0;
2064 dma_chan[1].dev_id = 1;
2065 }
2066 p->show_dma_caps();
2067 return 0;
2068
2069 exit_dma_irq_fail:
2070 dev_err(&pdev->dev, "unable to request IRQ %d"
2071 "for DMA (error %d)\n", dma_irq, ret);
2072 for (irq_rel = 0; irq_rel < ch; irq_rel++) {
2073 dma_irq = platform_get_irq(pdev, irq_rel);
2074 free_irq(dma_irq, (void *)(irq_rel + 1));
2075 }
2076
2077 exit_dma_lch_fail:
2078 kfree(p);
2079 kfree(d);
2080 kfree(dma_chan);
2081 return ret;
2082 }
2083
2084 static int __devexit omap_system_dma_remove(struct platform_device *pdev)
2085 {
2086 int dma_irq;
2087
2088 if (cpu_class_is_omap2()) {
2089 char irq_name[4];
2090 strcpy(irq_name, "0");
2091 dma_irq = platform_get_irq_byname(pdev, irq_name);
2092 remove_irq(dma_irq, &omap24xx_dma_irq);
2093 } else {
2094 int irq_rel = 0;
2095 for ( ; irq_rel < dma_chan_count; irq_rel++) {
2096 dma_irq = platform_get_irq(pdev, irq_rel);
2097 free_irq(dma_irq, (void *)(irq_rel + 1));
2098 }
2099 }
2100 kfree(p);
2101 kfree(d);
2102 kfree(dma_chan);
2103 return 0;
2104 }
2105
2106 static struct platform_driver omap_system_dma_driver = {
2107 .probe = omap_system_dma_probe,
2108 .remove = omap_system_dma_remove,
2109 .driver = {
2110 .name = "omap_dma_system"
2111 },
2112 };
2113
2114 static int __init omap_system_dma_init(void)
2115 {
2116 return platform_driver_register(&omap_system_dma_driver);
2117 }
2118 arch_initcall(omap_system_dma_init);
2119
2120 static void __exit omap_system_dma_exit(void)
2121 {
2122 platform_driver_unregister(&omap_system_dma_driver);
2123 }
2124
2125 MODULE_DESCRIPTION("OMAP SYSTEM DMA DRIVER");
2126 MODULE_LICENSE("GPL");
2127 MODULE_ALIAS("platform:" DRIVER_NAME);
2128 MODULE_AUTHOR("Texas Instruments Inc");
2129
2130 /*
2131 * Reserve the omap SDMA channels using cmdline bootarg
2132 * "omap_dma_reserve_ch=". The valid range is 1 to 32
2133 */
2134 static int __init omap_dma_cmdline_reserve_ch(char *str)
2135 {
2136 if (get_option(&str, &omap_dma_reserve_channels) != 1)
2137 omap_dma_reserve_channels = 0;
2138 return 1;
2139 }
2140
2141 __setup("omap_dma_reserve_ch=", omap_dma_cmdline_reserve_ch);
2142
2143
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