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Merge branch 'linus' into x86/mm
[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 * Support functions for the OMAP internal DMA channels.
14 *
15 * This program is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License version 2 as
17 * published by the Free Software Foundation.
18 *
19 */
20
21 #include <linux/module.h>
22 #include <linux/init.h>
23 #include <linux/sched.h>
24 #include <linux/spinlock.h>
25 #include <linux/errno.h>
26 #include <linux/interrupt.h>
27 #include <linux/irq.h>
28 #include <linux/io.h>
29
30 #include <asm/system.h>
31 #include <mach/hardware.h>
32 #include <mach/dma.h>
33
34 #include <mach/tc.h>
35
36 #undef DEBUG
37
38 #ifndef CONFIG_ARCH_OMAP1
39 enum { DMA_CH_ALLOC_DONE, DMA_CH_PARAMS_SET_DONE, DMA_CH_STARTED,
40 DMA_CH_QUEUED, DMA_CH_NOTSTARTED, DMA_CH_PAUSED, DMA_CH_LINK_ENABLED
41 };
42
43 enum { DMA_CHAIN_STARTED, DMA_CHAIN_NOTSTARTED };
44 #endif
45
46 #define OMAP_DMA_ACTIVE 0x01
47 #define OMAP_DMA_CCR_EN (1 << 7)
48 #define OMAP2_DMA_CSR_CLEAR_MASK 0xffe
49
50 #define OMAP_FUNC_MUX_ARM_BASE (0xfffe1000 + 0xec)
51
52 static int enable_1510_mode;
53
54 struct omap_dma_lch {
55 int next_lch;
56 int dev_id;
57 u16 saved_csr;
58 u16 enabled_irqs;
59 const char *dev_name;
60 void (*callback)(int lch, u16 ch_status, void *data);
61 void *data;
62
63 #ifndef CONFIG_ARCH_OMAP1
64 /* required for Dynamic chaining */
65 int prev_linked_ch;
66 int next_linked_ch;
67 int state;
68 int chain_id;
69
70 int status;
71 #endif
72 long flags;
73 };
74
75 struct dma_link_info {
76 int *linked_dmach_q;
77 int no_of_lchs_linked;
78
79 int q_count;
80 int q_tail;
81 int q_head;
82
83 int chain_state;
84 int chain_mode;
85
86 };
87
88 static struct dma_link_info *dma_linked_lch;
89
90 #ifndef CONFIG_ARCH_OMAP1
91
92 /* Chain handling macros */
93 #define OMAP_DMA_CHAIN_QINIT(chain_id) \
94 do { \
95 dma_linked_lch[chain_id].q_head = \
96 dma_linked_lch[chain_id].q_tail = \
97 dma_linked_lch[chain_id].q_count = 0; \
98 } while (0)
99 #define OMAP_DMA_CHAIN_QFULL(chain_id) \
100 (dma_linked_lch[chain_id].no_of_lchs_linked == \
101 dma_linked_lch[chain_id].q_count)
102 #define OMAP_DMA_CHAIN_QLAST(chain_id) \
103 do { \
104 ((dma_linked_lch[chain_id].no_of_lchs_linked-1) == \
105 dma_linked_lch[chain_id].q_count) \
106 } while (0)
107 #define OMAP_DMA_CHAIN_QEMPTY(chain_id) \
108 (0 == dma_linked_lch[chain_id].q_count)
109 #define __OMAP_DMA_CHAIN_INCQ(end) \
110 ((end) = ((end)+1) % dma_linked_lch[chain_id].no_of_lchs_linked)
111 #define OMAP_DMA_CHAIN_INCQHEAD(chain_id) \
112 do { \
113 __OMAP_DMA_CHAIN_INCQ(dma_linked_lch[chain_id].q_head); \
114 dma_linked_lch[chain_id].q_count--; \
115 } while (0)
116
117 #define OMAP_DMA_CHAIN_INCQTAIL(chain_id) \
118 do { \
119 __OMAP_DMA_CHAIN_INCQ(dma_linked_lch[chain_id].q_tail); \
120 dma_linked_lch[chain_id].q_count++; \
121 } while (0)
122 #endif
123
124 static int dma_lch_count;
125 static int dma_chan_count;
126 static int omap_dma_reserve_channels;
127
128 static spinlock_t dma_chan_lock;
129 static struct omap_dma_lch *dma_chan;
130 static void __iomem *omap_dma_base;
131
132 static const u8 omap1_dma_irq[OMAP1_LOGICAL_DMA_CH_COUNT] = {
133 INT_DMA_CH0_6, INT_DMA_CH1_7, INT_DMA_CH2_8, INT_DMA_CH3,
134 INT_DMA_CH4, INT_DMA_CH5, INT_1610_DMA_CH6, INT_1610_DMA_CH7,
135 INT_1610_DMA_CH8, INT_1610_DMA_CH9, INT_1610_DMA_CH10,
136 INT_1610_DMA_CH11, INT_1610_DMA_CH12, INT_1610_DMA_CH13,
137 INT_1610_DMA_CH14, INT_1610_DMA_CH15, INT_DMA_LCD
138 };
139
140 static inline void disable_lnk(int lch);
141 static void omap_disable_channel_irq(int lch);
142 static inline void omap_enable_channel_irq(int lch);
143
144 #define REVISIT_24XX() printk(KERN_ERR "FIXME: no %s on 24xx\n", \
145 __func__);
146
147 #define dma_read(reg) \
148 ({ \
149 u32 __val; \
150 if (cpu_class_is_omap1()) \
151 __val = __raw_readw(omap_dma_base + OMAP1_DMA_##reg); \
152 else \
153 __val = __raw_readl(omap_dma_base + OMAP_DMA4_##reg); \
154 __val; \
155 })
156
157 #define dma_write(val, reg) \
158 ({ \
159 if (cpu_class_is_omap1()) \
160 __raw_writew((u16)(val), omap_dma_base + OMAP1_DMA_##reg); \
161 else \
162 __raw_writel((val), omap_dma_base + OMAP_DMA4_##reg); \
163 })
164
165 #ifdef CONFIG_ARCH_OMAP15XX
166 /* Returns 1 if the DMA module is in OMAP1510-compatible mode, 0 otherwise */
167 int omap_dma_in_1510_mode(void)
168 {
169 return enable_1510_mode;
170 }
171 #else
172 #define omap_dma_in_1510_mode() 0
173 #endif
174
175 #ifdef CONFIG_ARCH_OMAP1
176 static inline int get_gdma_dev(int req)
177 {
178 u32 reg = OMAP_FUNC_MUX_ARM_BASE + ((req - 1) / 5) * 4;
179 int shift = ((req - 1) % 5) * 6;
180
181 return ((omap_readl(reg) >> shift) & 0x3f) + 1;
182 }
183
184 static inline void set_gdma_dev(int req, int dev)
185 {
186 u32 reg = OMAP_FUNC_MUX_ARM_BASE + ((req - 1) / 5) * 4;
187 int shift = ((req - 1) % 5) * 6;
188 u32 l;
189
190 l = omap_readl(reg);
191 l &= ~(0x3f << shift);
192 l |= (dev - 1) << shift;
193 omap_writel(l, reg);
194 }
195 #else
196 #define set_gdma_dev(req, dev) do {} while (0)
197 #endif
198
199 /* Omap1 only */
200 static void clear_lch_regs(int lch)
201 {
202 int i;
203 void __iomem *lch_base = omap_dma_base + OMAP1_DMA_CH_BASE(lch);
204
205 for (i = 0; i < 0x2c; i += 2)
206 __raw_writew(0, lch_base + i);
207 }
208
209 void omap_set_dma_priority(int lch, int dst_port, int priority)
210 {
211 unsigned long reg;
212 u32 l;
213
214 if (cpu_class_is_omap1()) {
215 switch (dst_port) {
216 case OMAP_DMA_PORT_OCP_T1: /* FFFECC00 */
217 reg = OMAP_TC_OCPT1_PRIOR;
218 break;
219 case OMAP_DMA_PORT_OCP_T2: /* FFFECCD0 */
220 reg = OMAP_TC_OCPT2_PRIOR;
221 break;
222 case OMAP_DMA_PORT_EMIFF: /* FFFECC08 */
223 reg = OMAP_TC_EMIFF_PRIOR;
224 break;
225 case OMAP_DMA_PORT_EMIFS: /* FFFECC04 */
226 reg = OMAP_TC_EMIFS_PRIOR;
227 break;
228 default:
229 BUG();
230 return;
231 }
232 l = omap_readl(reg);
233 l &= ~(0xf << 8);
234 l |= (priority & 0xf) << 8;
235 omap_writel(l, reg);
236 }
237
238 if (cpu_class_is_omap2()) {
239 u32 ccr;
240
241 ccr = dma_read(CCR(lch));
242 if (priority)
243 ccr |= (1 << 6);
244 else
245 ccr &= ~(1 << 6);
246 dma_write(ccr, CCR(lch));
247 }
248 }
249 EXPORT_SYMBOL(omap_set_dma_priority);
250
251 void omap_set_dma_transfer_params(int lch, int data_type, int elem_count,
252 int frame_count, int sync_mode,
253 int dma_trigger, int src_or_dst_synch)
254 {
255 u32 l;
256
257 l = dma_read(CSDP(lch));
258 l &= ~0x03;
259 l |= data_type;
260 dma_write(l, CSDP(lch));
261
262 if (cpu_class_is_omap1()) {
263 u16 ccr;
264
265 ccr = dma_read(CCR(lch));
266 ccr &= ~(1 << 5);
267 if (sync_mode == OMAP_DMA_SYNC_FRAME)
268 ccr |= 1 << 5;
269 dma_write(ccr, CCR(lch));
270
271 ccr = dma_read(CCR2(lch));
272 ccr &= ~(1 << 2);
273 if (sync_mode == OMAP_DMA_SYNC_BLOCK)
274 ccr |= 1 << 2;
275 dma_write(ccr, CCR2(lch));
276 }
277
278 if (cpu_class_is_omap2() && dma_trigger) {
279 u32 val;
280
281 val = dma_read(CCR(lch));
282
283 /* DMA_SYNCHRO_CONTROL_UPPER depends on the channel number */
284 val &= ~((3 << 19) | 0x1f);
285 val |= (dma_trigger & ~0x1f) << 14;
286 val |= dma_trigger & 0x1f;
287
288 if (sync_mode & OMAP_DMA_SYNC_FRAME)
289 val |= 1 << 5;
290 else
291 val &= ~(1 << 5);
292
293 if (sync_mode & OMAP_DMA_SYNC_BLOCK)
294 val |= 1 << 18;
295 else
296 val &= ~(1 << 18);
297
298 if (src_or_dst_synch)
299 val |= 1 << 24; /* source synch */
300 else
301 val &= ~(1 << 24); /* dest synch */
302
303 dma_write(val, CCR(lch));
304 }
305
306 dma_write(elem_count, CEN(lch));
307 dma_write(frame_count, CFN(lch));
308 }
309 EXPORT_SYMBOL(omap_set_dma_transfer_params);
310
311 void omap_set_dma_color_mode(int lch, enum omap_dma_color_mode mode, u32 color)
312 {
313 u16 w;
314
315 BUG_ON(omap_dma_in_1510_mode());
316
317 if (cpu_class_is_omap2()) {
318 REVISIT_24XX();
319 return;
320 }
321
322 w = dma_read(CCR2(lch));
323 w &= ~0x03;
324
325 switch (mode) {
326 case OMAP_DMA_CONSTANT_FILL:
327 w |= 0x01;
328 break;
329 case OMAP_DMA_TRANSPARENT_COPY:
330 w |= 0x02;
331 break;
332 case OMAP_DMA_COLOR_DIS:
333 break;
334 default:
335 BUG();
336 }
337 dma_write(w, CCR2(lch));
338
339 w = dma_read(LCH_CTRL(lch));
340 w &= ~0x0f;
341 /* Default is channel type 2D */
342 if (mode) {
343 dma_write((u16)color, COLOR_L(lch));
344 dma_write((u16)(color >> 16), COLOR_U(lch));
345 w |= 1; /* Channel type G */
346 }
347 dma_write(w, LCH_CTRL(lch));
348 }
349 EXPORT_SYMBOL(omap_set_dma_color_mode);
350
351 void omap_set_dma_write_mode(int lch, enum omap_dma_write_mode mode)
352 {
353 if (cpu_class_is_omap2()) {
354 u32 csdp;
355
356 csdp = dma_read(CSDP(lch));
357 csdp &= ~(0x3 << 16);
358 csdp |= (mode << 16);
359 dma_write(csdp, CSDP(lch));
360 }
361 }
362 EXPORT_SYMBOL(omap_set_dma_write_mode);
363
364 void omap_set_dma_channel_mode(int lch, enum omap_dma_channel_mode mode)
365 {
366 if (cpu_class_is_omap1() && !cpu_is_omap15xx()) {
367 u32 l;
368
369 l = dma_read(LCH_CTRL(lch));
370 l &= ~0x7;
371 l |= mode;
372 dma_write(l, LCH_CTRL(lch));
373 }
374 }
375 EXPORT_SYMBOL(omap_set_dma_channel_mode);
376
377 /* Note that src_port is only for omap1 */
378 void omap_set_dma_src_params(int lch, int src_port, int src_amode,
379 unsigned long src_start,
380 int src_ei, int src_fi)
381 {
382 u32 l;
383
384 if (cpu_class_is_omap1()) {
385 u16 w;
386
387 w = dma_read(CSDP(lch));
388 w &= ~(0x1f << 2);
389 w |= src_port << 2;
390 dma_write(w, CSDP(lch));
391 }
392
393 l = dma_read(CCR(lch));
394 l &= ~(0x03 << 12);
395 l |= src_amode << 12;
396 dma_write(l, CCR(lch));
397
398 if (cpu_class_is_omap1()) {
399 dma_write(src_start >> 16, CSSA_U(lch));
400 dma_write((u16)src_start, CSSA_L(lch));
401 }
402
403 if (cpu_class_is_omap2())
404 dma_write(src_start, CSSA(lch));
405
406 dma_write(src_ei, CSEI(lch));
407 dma_write(src_fi, CSFI(lch));
408 }
409 EXPORT_SYMBOL(omap_set_dma_src_params);
410
411 void omap_set_dma_params(int lch, struct omap_dma_channel_params *params)
412 {
413 omap_set_dma_transfer_params(lch, params->data_type,
414 params->elem_count, params->frame_count,
415 params->sync_mode, params->trigger,
416 params->src_or_dst_synch);
417 omap_set_dma_src_params(lch, params->src_port,
418 params->src_amode, params->src_start,
419 params->src_ei, params->src_fi);
420
421 omap_set_dma_dest_params(lch, params->dst_port,
422 params->dst_amode, params->dst_start,
423 params->dst_ei, params->dst_fi);
424 if (params->read_prio || params->write_prio)
425 omap_dma_set_prio_lch(lch, params->read_prio,
426 params->write_prio);
427 }
428 EXPORT_SYMBOL(omap_set_dma_params);
429
430 void omap_set_dma_src_index(int lch, int eidx, int fidx)
431 {
432 if (cpu_class_is_omap2())
433 return;
434
435 dma_write(eidx, CSEI(lch));
436 dma_write(fidx, CSFI(lch));
437 }
438 EXPORT_SYMBOL(omap_set_dma_src_index);
439
440 void omap_set_dma_src_data_pack(int lch, int enable)
441 {
442 u32 l;
443
444 l = dma_read(CSDP(lch));
445 l &= ~(1 << 6);
446 if (enable)
447 l |= (1 << 6);
448 dma_write(l, CSDP(lch));
449 }
450 EXPORT_SYMBOL(omap_set_dma_src_data_pack);
451
452 void omap_set_dma_src_burst_mode(int lch, enum omap_dma_burst_mode burst_mode)
453 {
454 unsigned int burst = 0;
455 u32 l;
456
457 l = dma_read(CSDP(lch));
458 l &= ~(0x03 << 7);
459
460 switch (burst_mode) {
461 case OMAP_DMA_DATA_BURST_DIS:
462 break;
463 case OMAP_DMA_DATA_BURST_4:
464 if (cpu_class_is_omap2())
465 burst = 0x1;
466 else
467 burst = 0x2;
468 break;
469 case OMAP_DMA_DATA_BURST_8:
470 if (cpu_class_is_omap2()) {
471 burst = 0x2;
472 break;
473 }
474 /* not supported by current hardware on OMAP1
475 * w |= (0x03 << 7);
476 * fall through
477 */
478 case OMAP_DMA_DATA_BURST_16:
479 if (cpu_class_is_omap2()) {
480 burst = 0x3;
481 break;
482 }
483 /* OMAP1 don't support burst 16
484 * fall through
485 */
486 default:
487 BUG();
488 }
489
490 l |= (burst << 7);
491 dma_write(l, CSDP(lch));
492 }
493 EXPORT_SYMBOL(omap_set_dma_src_burst_mode);
494
495 /* Note that dest_port is only for OMAP1 */
496 void omap_set_dma_dest_params(int lch, int dest_port, int dest_amode,
497 unsigned long dest_start,
498 int dst_ei, int dst_fi)
499 {
500 u32 l;
501
502 if (cpu_class_is_omap1()) {
503 l = dma_read(CSDP(lch));
504 l &= ~(0x1f << 9);
505 l |= dest_port << 9;
506 dma_write(l, CSDP(lch));
507 }
508
509 l = dma_read(CCR(lch));
510 l &= ~(0x03 << 14);
511 l |= dest_amode << 14;
512 dma_write(l, CCR(lch));
513
514 if (cpu_class_is_omap1()) {
515 dma_write(dest_start >> 16, CDSA_U(lch));
516 dma_write(dest_start, CDSA_L(lch));
517 }
518
519 if (cpu_class_is_omap2())
520 dma_write(dest_start, CDSA(lch));
521
522 dma_write(dst_ei, CDEI(lch));
523 dma_write(dst_fi, CDFI(lch));
524 }
525 EXPORT_SYMBOL(omap_set_dma_dest_params);
526
527 void omap_set_dma_dest_index(int lch, int eidx, int fidx)
528 {
529 if (cpu_class_is_omap2())
530 return;
531
532 dma_write(eidx, CDEI(lch));
533 dma_write(fidx, CDFI(lch));
534 }
535 EXPORT_SYMBOL(omap_set_dma_dest_index);
536
537 void omap_set_dma_dest_data_pack(int lch, int enable)
538 {
539 u32 l;
540
541 l = dma_read(CSDP(lch));
542 l &= ~(1 << 13);
543 if (enable)
544 l |= 1 << 13;
545 dma_write(l, CSDP(lch));
546 }
547 EXPORT_SYMBOL(omap_set_dma_dest_data_pack);
548
549 void omap_set_dma_dest_burst_mode(int lch, enum omap_dma_burst_mode burst_mode)
550 {
551 unsigned int burst = 0;
552 u32 l;
553
554 l = dma_read(CSDP(lch));
555 l &= ~(0x03 << 14);
556
557 switch (burst_mode) {
558 case OMAP_DMA_DATA_BURST_DIS:
559 break;
560 case OMAP_DMA_DATA_BURST_4:
561 if (cpu_class_is_omap2())
562 burst = 0x1;
563 else
564 burst = 0x2;
565 break;
566 case OMAP_DMA_DATA_BURST_8:
567 if (cpu_class_is_omap2())
568 burst = 0x2;
569 else
570 burst = 0x3;
571 break;
572 case OMAP_DMA_DATA_BURST_16:
573 if (cpu_class_is_omap2()) {
574 burst = 0x3;
575 break;
576 }
577 /* OMAP1 don't support burst 16
578 * fall through
579 */
580 default:
581 printk(KERN_ERR "Invalid DMA burst mode\n");
582 BUG();
583 return;
584 }
585 l |= (burst << 14);
586 dma_write(l, CSDP(lch));
587 }
588 EXPORT_SYMBOL(omap_set_dma_dest_burst_mode);
589
590 static inline void omap_enable_channel_irq(int lch)
591 {
592 u32 status;
593
594 /* Clear CSR */
595 if (cpu_class_is_omap1())
596 status = dma_read(CSR(lch));
597 else if (cpu_class_is_omap2())
598 dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR(lch));
599
600 /* Enable some nice interrupts. */
601 dma_write(dma_chan[lch].enabled_irqs, CICR(lch));
602 }
603
604 static void omap_disable_channel_irq(int lch)
605 {
606 if (cpu_class_is_omap2())
607 dma_write(0, CICR(lch));
608 }
609
610 void omap_enable_dma_irq(int lch, u16 bits)
611 {
612 dma_chan[lch].enabled_irqs |= bits;
613 }
614 EXPORT_SYMBOL(omap_enable_dma_irq);
615
616 void omap_disable_dma_irq(int lch, u16 bits)
617 {
618 dma_chan[lch].enabled_irqs &= ~bits;
619 }
620 EXPORT_SYMBOL(omap_disable_dma_irq);
621
622 static inline void enable_lnk(int lch)
623 {
624 u32 l;
625
626 l = dma_read(CLNK_CTRL(lch));
627
628 if (cpu_class_is_omap1())
629 l &= ~(1 << 14);
630
631 /* Set the ENABLE_LNK bits */
632 if (dma_chan[lch].next_lch != -1)
633 l = dma_chan[lch].next_lch | (1 << 15);
634
635 #ifndef CONFIG_ARCH_OMAP1
636 if (cpu_class_is_omap2())
637 if (dma_chan[lch].next_linked_ch != -1)
638 l = dma_chan[lch].next_linked_ch | (1 << 15);
639 #endif
640
641 dma_write(l, CLNK_CTRL(lch));
642 }
643
644 static inline void disable_lnk(int lch)
645 {
646 u32 l;
647
648 l = dma_read(CLNK_CTRL(lch));
649
650 /* Disable interrupts */
651 if (cpu_class_is_omap1()) {
652 dma_write(0, CICR(lch));
653 /* Set the STOP_LNK bit */
654 l |= 1 << 14;
655 }
656
657 if (cpu_class_is_omap2()) {
658 omap_disable_channel_irq(lch);
659 /* Clear the ENABLE_LNK bit */
660 l &= ~(1 << 15);
661 }
662
663 dma_write(l, CLNK_CTRL(lch));
664 dma_chan[lch].flags &= ~OMAP_DMA_ACTIVE;
665 }
666
667 static inline void omap2_enable_irq_lch(int lch)
668 {
669 u32 val;
670
671 if (!cpu_class_is_omap2())
672 return;
673
674 val = dma_read(IRQENABLE_L0);
675 val |= 1 << lch;
676 dma_write(val, IRQENABLE_L0);
677 }
678
679 int omap_request_dma(int dev_id, const char *dev_name,
680 void (*callback)(int lch, u16 ch_status, void *data),
681 void *data, int *dma_ch_out)
682 {
683 int ch, free_ch = -1;
684 unsigned long flags;
685 struct omap_dma_lch *chan;
686
687 spin_lock_irqsave(&dma_chan_lock, flags);
688 for (ch = 0; ch < dma_chan_count; ch++) {
689 if (free_ch == -1 && dma_chan[ch].dev_id == -1) {
690 free_ch = ch;
691 if (dev_id == 0)
692 break;
693 }
694 }
695 if (free_ch == -1) {
696 spin_unlock_irqrestore(&dma_chan_lock, flags);
697 return -EBUSY;
698 }
699 chan = dma_chan + free_ch;
700 chan->dev_id = dev_id;
701
702 if (cpu_class_is_omap1())
703 clear_lch_regs(free_ch);
704
705 if (cpu_class_is_omap2())
706 omap_clear_dma(free_ch);
707
708 spin_unlock_irqrestore(&dma_chan_lock, flags);
709
710 chan->dev_name = dev_name;
711 chan->callback = callback;
712 chan->data = data;
713 chan->flags = 0;
714
715 #ifndef CONFIG_ARCH_OMAP1
716 if (cpu_class_is_omap2()) {
717 chan->chain_id = -1;
718 chan->next_linked_ch = -1;
719 }
720 #endif
721
722 chan->enabled_irqs = OMAP_DMA_DROP_IRQ | OMAP_DMA_BLOCK_IRQ;
723
724 if (cpu_class_is_omap1())
725 chan->enabled_irqs |= OMAP1_DMA_TOUT_IRQ;
726 else if (cpu_class_is_omap2())
727 chan->enabled_irqs |= OMAP2_DMA_MISALIGNED_ERR_IRQ |
728 OMAP2_DMA_TRANS_ERR_IRQ;
729
730 if (cpu_is_omap16xx()) {
731 /* If the sync device is set, configure it dynamically. */
732 if (dev_id != 0) {
733 set_gdma_dev(free_ch + 1, dev_id);
734 dev_id = free_ch + 1;
735 }
736 /*
737 * Disable the 1510 compatibility mode and set the sync device
738 * id.
739 */
740 dma_write(dev_id | (1 << 10), CCR(free_ch));
741 } else if (cpu_is_omap7xx() || cpu_is_omap15xx()) {
742 dma_write(dev_id, CCR(free_ch));
743 }
744
745 if (cpu_class_is_omap2()) {
746 omap2_enable_irq_lch(free_ch);
747 omap_enable_channel_irq(free_ch);
748 /* Clear the CSR register and IRQ status register */
749 dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR(free_ch));
750 dma_write(1 << free_ch, IRQSTATUS_L0);
751 }
752
753 *dma_ch_out = free_ch;
754
755 return 0;
756 }
757 EXPORT_SYMBOL(omap_request_dma);
758
759 void omap_free_dma(int lch)
760 {
761 unsigned long flags;
762
763 spin_lock_irqsave(&dma_chan_lock, flags);
764 if (dma_chan[lch].dev_id == -1) {
765 pr_err("omap_dma: trying to free unallocated DMA channel %d\n",
766 lch);
767 spin_unlock_irqrestore(&dma_chan_lock, flags);
768 return;
769 }
770
771 dma_chan[lch].dev_id = -1;
772 dma_chan[lch].next_lch = -1;
773 dma_chan[lch].callback = NULL;
774 spin_unlock_irqrestore(&dma_chan_lock, flags);
775
776 if (cpu_class_is_omap1()) {
777 /* Disable all DMA interrupts for the channel. */
778 dma_write(0, CICR(lch));
779 /* Make sure the DMA transfer is stopped. */
780 dma_write(0, CCR(lch));
781 }
782
783 if (cpu_class_is_omap2()) {
784 u32 val;
785 /* Disable interrupts */
786 val = dma_read(IRQENABLE_L0);
787 val &= ~(1 << lch);
788 dma_write(val, IRQENABLE_L0);
789
790 /* Clear the CSR register and IRQ status register */
791 dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR(lch));
792 dma_write(1 << lch, IRQSTATUS_L0);
793
794 /* Disable all DMA interrupts for the channel. */
795 dma_write(0, CICR(lch));
796
797 /* Make sure the DMA transfer is stopped. */
798 dma_write(0, CCR(lch));
799 omap_clear_dma(lch);
800 }
801 }
802 EXPORT_SYMBOL(omap_free_dma);
803
804 /**
805 * @brief omap_dma_set_global_params : Set global priority settings for dma
806 *
807 * @param arb_rate
808 * @param max_fifo_depth
809 * @param tparams - Number of thereads to reserve : DMA_THREAD_RESERVE_NORM
810 * DMA_THREAD_RESERVE_ONET
811 * DMA_THREAD_RESERVE_TWOT
812 * DMA_THREAD_RESERVE_THREET
813 */
814 void
815 omap_dma_set_global_params(int arb_rate, int max_fifo_depth, int tparams)
816 {
817 u32 reg;
818
819 if (!cpu_class_is_omap2()) {
820 printk(KERN_ERR "FIXME: no %s on 15xx/16xx\n", __func__);
821 return;
822 }
823
824 if (arb_rate == 0)
825 arb_rate = 1;
826
827 reg = (arb_rate & 0xff) << 16;
828 reg |= (0xff & max_fifo_depth);
829
830 dma_write(reg, GCR);
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 = dma_read(CCR(lch));
854 l &= ~((1 << 6) | (1 << 26));
855 if (cpu_is_omap2430() || cpu_is_omap34xx())
856 l |= ((read_prio & 0x1) << 6) | ((write_prio & 0x1) << 26);
857 else
858 l |= ((read_prio & 0x1) << 6);
859
860 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
876 if (cpu_class_is_omap1()) {
877 u32 l;
878
879 l = dma_read(CCR(lch));
880 l &= ~OMAP_DMA_CCR_EN;
881 dma_write(l, CCR(lch));
882
883 /* Clear pending interrupts */
884 l = dma_read(CSR(lch));
885 }
886
887 if (cpu_class_is_omap2()) {
888 int i;
889 void __iomem *lch_base = omap_dma_base + OMAP_DMA4_CH_BASE(lch);
890 for (i = 0; i < 0x44; i += 4)
891 __raw_writel(0, lch_base + i);
892 }
893
894 local_irq_restore(flags);
895 }
896 EXPORT_SYMBOL(omap_clear_dma);
897
898 void omap_start_dma(int lch)
899 {
900 u32 l;
901
902 if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) {
903 int next_lch, cur_lch;
904 char dma_chan_link_map[OMAP_DMA4_LOGICAL_DMA_CH_COUNT];
905
906 dma_chan_link_map[lch] = 1;
907 /* Set the link register of the first channel */
908 enable_lnk(lch);
909
910 memset(dma_chan_link_map, 0, sizeof(dma_chan_link_map));
911 cur_lch = dma_chan[lch].next_lch;
912 do {
913 next_lch = dma_chan[cur_lch].next_lch;
914
915 /* The loop case: we've been here already */
916 if (dma_chan_link_map[cur_lch])
917 break;
918 /* Mark the current channel */
919 dma_chan_link_map[cur_lch] = 1;
920
921 enable_lnk(cur_lch);
922 omap_enable_channel_irq(cur_lch);
923
924 cur_lch = next_lch;
925 } while (next_lch != -1);
926 } else if (cpu_class_is_omap2()) {
927 /* Errata: Need to write lch even if not using chaining */
928 dma_write(lch, CLNK_CTRL(lch));
929 }
930
931 omap_enable_channel_irq(lch);
932
933 l = dma_read(CCR(lch));
934
935 /*
936 * Errata: On ES2.0 BUFFERING disable must be set.
937 * This will always fail on ES1.0
938 */
939 if (cpu_is_omap24xx())
940 l |= OMAP_DMA_CCR_EN;
941
942 l |= OMAP_DMA_CCR_EN;
943 dma_write(l, CCR(lch));
944
945 dma_chan[lch].flags |= OMAP_DMA_ACTIVE;
946 }
947 EXPORT_SYMBOL(omap_start_dma);
948
949 void omap_stop_dma(int lch)
950 {
951 u32 l;
952
953 if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) {
954 int next_lch, cur_lch = lch;
955 char dma_chan_link_map[OMAP_DMA4_LOGICAL_DMA_CH_COUNT];
956
957 memset(dma_chan_link_map, 0, sizeof(dma_chan_link_map));
958 do {
959 /* The loop case: we've been here already */
960 if (dma_chan_link_map[cur_lch])
961 break;
962 /* Mark the current channel */
963 dma_chan_link_map[cur_lch] = 1;
964
965 disable_lnk(cur_lch);
966
967 next_lch = dma_chan[cur_lch].next_lch;
968 cur_lch = next_lch;
969 } while (next_lch != -1);
970
971 return;
972 }
973
974 /* Disable all interrupts on the channel */
975 if (cpu_class_is_omap1())
976 dma_write(0, CICR(lch));
977
978 l = dma_read(CCR(lch));
979 l &= ~OMAP_DMA_CCR_EN;
980 dma_write(l, CCR(lch));
981
982 dma_chan[lch].flags &= ~OMAP_DMA_ACTIVE;
983 }
984 EXPORT_SYMBOL(omap_stop_dma);
985
986 /*
987 * Allows changing the DMA callback function or data. This may be needed if
988 * the driver shares a single DMA channel for multiple dma triggers.
989 */
990 int omap_set_dma_callback(int lch,
991 void (*callback)(int lch, u16 ch_status, void *data),
992 void *data)
993 {
994 unsigned long flags;
995
996 if (lch < 0)
997 return -ENODEV;
998
999 spin_lock_irqsave(&dma_chan_lock, flags);
1000 if (dma_chan[lch].dev_id == -1) {
1001 printk(KERN_ERR "DMA callback for not set for free channel\n");
1002 spin_unlock_irqrestore(&dma_chan_lock, flags);
1003 return -EINVAL;
1004 }
1005 dma_chan[lch].callback = callback;
1006 dma_chan[lch].data = data;
1007 spin_unlock_irqrestore(&dma_chan_lock, flags);
1008
1009 return 0;
1010 }
1011 EXPORT_SYMBOL(omap_set_dma_callback);
1012
1013 /*
1014 * Returns current physical source address for the given DMA channel.
1015 * If the channel is running the caller must disable interrupts prior calling
1016 * this function and process the returned value before re-enabling interrupt to
1017 * prevent races with the interrupt handler. Note that in continuous mode there
1018 * is a chance for CSSA_L register overflow inbetween the two reads resulting
1019 * in incorrect return value.
1020 */
1021 dma_addr_t omap_get_dma_src_pos(int lch)
1022 {
1023 dma_addr_t offset = 0;
1024
1025 if (cpu_is_omap15xx())
1026 offset = dma_read(CPC(lch));
1027 else
1028 offset = dma_read(CSAC(lch));
1029
1030 /*
1031 * omap 3.2/3.3 erratum: sometimes 0 is returned if CSAC/CDAC is
1032 * read before the DMA controller finished disabling the channel.
1033 */
1034 if (!cpu_is_omap15xx() && offset == 0)
1035 offset = dma_read(CSAC(lch));
1036
1037 if (cpu_class_is_omap1())
1038 offset |= (dma_read(CSSA_U(lch)) << 16);
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 inbetween 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 = dma_read(CPC(lch));
1058 else
1059 offset = 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 = dma_read(CDAC(lch));
1067
1068 if (cpu_class_is_omap1())
1069 offset |= (dma_read(CDSA_U(lch)) << 16);
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 (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 /* Check if LCD DMA is running */
1086 if (cpu_is_omap16xx())
1087 if (omap_readw(OMAP1610_DMA_LCD_CCR) & OMAP_DMA_CCR_EN)
1088 return 1;
1089
1090 for (lch = 0; lch < dma_chan_count; lch++)
1091 if (dma_read(CCR(lch)) & OMAP_DMA_CCR_EN)
1092 return 1;
1093
1094 return 0;
1095 }
1096
1097 /*
1098 * lch_queue DMA will start right after lch_head one is finished.
1099 * For this DMA link to start, you still need to start (see omap_start_dma)
1100 * the first one. That will fire up the entire queue.
1101 */
1102 void omap_dma_link_lch(int lch_head, int lch_queue)
1103 {
1104 if (omap_dma_in_1510_mode()) {
1105 printk(KERN_ERR "DMA linking is not supported in 1510 mode\n");
1106 BUG();
1107 return;
1108 }
1109
1110 if ((dma_chan[lch_head].dev_id == -1) ||
1111 (dma_chan[lch_queue].dev_id == -1)) {
1112 printk(KERN_ERR "omap_dma: trying to link "
1113 "non requested channels\n");
1114 dump_stack();
1115 }
1116
1117 dma_chan[lch_head].next_lch = lch_queue;
1118 }
1119 EXPORT_SYMBOL(omap_dma_link_lch);
1120
1121 /*
1122 * Once the DMA queue is stopped, we can destroy it.
1123 */
1124 void omap_dma_unlink_lch(int lch_head, int lch_queue)
1125 {
1126 if (omap_dma_in_1510_mode()) {
1127 printk(KERN_ERR "DMA linking is not supported in 1510 mode\n");
1128 BUG();
1129 return;
1130 }
1131
1132 if (dma_chan[lch_head].next_lch != lch_queue ||
1133 dma_chan[lch_head].next_lch == -1) {
1134 printk(KERN_ERR "omap_dma: trying to unlink "
1135 "non linked channels\n");
1136 dump_stack();
1137 }
1138
1139 if ((dma_chan[lch_head].flags & OMAP_DMA_ACTIVE) ||
1140 (dma_chan[lch_head].flags & OMAP_DMA_ACTIVE)) {
1141 printk(KERN_ERR "omap_dma: You need to stop the DMA channels "
1142 "before unlinking\n");
1143 dump_stack();
1144 }
1145
1146 dma_chan[lch_head].next_lch = -1;
1147 }
1148 EXPORT_SYMBOL(omap_dma_unlink_lch);
1149
1150 /*----------------------------------------------------------------------------*/
1151
1152 #ifndef CONFIG_ARCH_OMAP1
1153 /* Create chain of DMA channesls */
1154 static void create_dma_lch_chain(int lch_head, int lch_queue)
1155 {
1156 u32 l;
1157
1158 /* Check if this is the first link in chain */
1159 if (dma_chan[lch_head].next_linked_ch == -1) {
1160 dma_chan[lch_head].next_linked_ch = lch_queue;
1161 dma_chan[lch_head].prev_linked_ch = lch_queue;
1162 dma_chan[lch_queue].next_linked_ch = lch_head;
1163 dma_chan[lch_queue].prev_linked_ch = lch_head;
1164 }
1165
1166 /* a link exists, link the new channel in circular chain */
1167 else {
1168 dma_chan[lch_queue].next_linked_ch =
1169 dma_chan[lch_head].next_linked_ch;
1170 dma_chan[lch_queue].prev_linked_ch = lch_head;
1171 dma_chan[lch_head].next_linked_ch = lch_queue;
1172 dma_chan[dma_chan[lch_queue].next_linked_ch].prev_linked_ch =
1173 lch_queue;
1174 }
1175
1176 l = dma_read(CLNK_CTRL(lch_head));
1177 l &= ~(0x1f);
1178 l |= lch_queue;
1179 dma_write(l, CLNK_CTRL(lch_head));
1180
1181 l = dma_read(CLNK_CTRL(lch_queue));
1182 l &= ~(0x1f);
1183 l |= (dma_chan[lch_queue].next_linked_ch);
1184 dma_write(l, CLNK_CTRL(lch_queue));
1185 }
1186
1187 /**
1188 * @brief omap_request_dma_chain : Request a chain of DMA channels
1189 *
1190 * @param dev_id - Device id using the dma channel
1191 * @param dev_name - Device name
1192 * @param callback - Call back function
1193 * @chain_id -
1194 * @no_of_chans - Number of channels requested
1195 * @chain_mode - Dynamic or static chaining : OMAP_DMA_STATIC_CHAIN
1196 * OMAP_DMA_DYNAMIC_CHAIN
1197 * @params - Channel parameters
1198 *
1199 * @return - Succes : 0
1200 * Failure: -EINVAL/-ENOMEM
1201 */
1202 int omap_request_dma_chain(int dev_id, const char *dev_name,
1203 void (*callback) (int chain_id, u16 ch_status,
1204 void *data),
1205 int *chain_id, int no_of_chans, int chain_mode,
1206 struct omap_dma_channel_params params)
1207 {
1208 int *channels;
1209 int i, err;
1210
1211 /* Is the chain mode valid ? */
1212 if (chain_mode != OMAP_DMA_STATIC_CHAIN
1213 && chain_mode != OMAP_DMA_DYNAMIC_CHAIN) {
1214 printk(KERN_ERR "Invalid chain mode requested\n");
1215 return -EINVAL;
1216 }
1217
1218 if (unlikely((no_of_chans < 1
1219 || no_of_chans > dma_lch_count))) {
1220 printk(KERN_ERR "Invalid Number of channels requested\n");
1221 return -EINVAL;
1222 }
1223
1224 /* Allocate a queue to maintain the status of the channels
1225 * in the chain */
1226 channels = kmalloc(sizeof(*channels) * no_of_chans, GFP_KERNEL);
1227 if (channels == NULL) {
1228 printk(KERN_ERR "omap_dma: No memory for channel queue\n");
1229 return -ENOMEM;
1230 }
1231
1232 /* request and reserve DMA channels for the chain */
1233 for (i = 0; i < no_of_chans; i++) {
1234 err = omap_request_dma(dev_id, dev_name,
1235 callback, NULL, &channels[i]);
1236 if (err < 0) {
1237 int j;
1238 for (j = 0; j < i; j++)
1239 omap_free_dma(channels[j]);
1240 kfree(channels);
1241 printk(KERN_ERR "omap_dma: Request failed %d\n", err);
1242 return err;
1243 }
1244 dma_chan[channels[i]].prev_linked_ch = -1;
1245 dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
1246
1247 /*
1248 * Allowing client drivers to set common parameters now,
1249 * so that later only relevant (src_start, dest_start
1250 * and element count) can be set
1251 */
1252 omap_set_dma_params(channels[i], &params);
1253 }
1254
1255 *chain_id = channels[0];
1256 dma_linked_lch[*chain_id].linked_dmach_q = channels;
1257 dma_linked_lch[*chain_id].chain_mode = chain_mode;
1258 dma_linked_lch[*chain_id].chain_state = DMA_CHAIN_NOTSTARTED;
1259 dma_linked_lch[*chain_id].no_of_lchs_linked = no_of_chans;
1260
1261 for (i = 0; i < no_of_chans; i++)
1262 dma_chan[channels[i]].chain_id = *chain_id;
1263
1264 /* Reset the Queue pointers */
1265 OMAP_DMA_CHAIN_QINIT(*chain_id);
1266
1267 /* Set up the chain */
1268 if (no_of_chans == 1)
1269 create_dma_lch_chain(channels[0], channels[0]);
1270 else {
1271 for (i = 0; i < (no_of_chans - 1); i++)
1272 create_dma_lch_chain(channels[i], channels[i + 1]);
1273 }
1274
1275 return 0;
1276 }
1277 EXPORT_SYMBOL(omap_request_dma_chain);
1278
1279 /**
1280 * @brief omap_modify_dma_chain_param : Modify the chain's params - Modify the
1281 * params after setting it. Dont do this while dma is running!!
1282 *
1283 * @param chain_id - Chained logical channel id.
1284 * @param params
1285 *
1286 * @return - Success : 0
1287 * Failure : -EINVAL
1288 */
1289 int omap_modify_dma_chain_params(int chain_id,
1290 struct omap_dma_channel_params params)
1291 {
1292 int *channels;
1293 u32 i;
1294
1295 /* Check for input params */
1296 if (unlikely((chain_id < 0
1297 || chain_id >= dma_lch_count))) {
1298 printk(KERN_ERR "Invalid chain id\n");
1299 return -EINVAL;
1300 }
1301
1302 /* Check if the chain exists */
1303 if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1304 printk(KERN_ERR "Chain doesn't exists\n");
1305 return -EINVAL;
1306 }
1307 channels = dma_linked_lch[chain_id].linked_dmach_q;
1308
1309 for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
1310 /*
1311 * Allowing client drivers to set common parameters now,
1312 * so that later only relevant (src_start, dest_start
1313 * and element count) can be set
1314 */
1315 omap_set_dma_params(channels[i], &params);
1316 }
1317
1318 return 0;
1319 }
1320 EXPORT_SYMBOL(omap_modify_dma_chain_params);
1321
1322 /**
1323 * @brief omap_free_dma_chain - Free all the logical channels in a chain.
1324 *
1325 * @param chain_id
1326 *
1327 * @return - Success : 0
1328 * Failure : -EINVAL
1329 */
1330 int omap_free_dma_chain(int chain_id)
1331 {
1332 int *channels;
1333 u32 i;
1334
1335 /* Check for input params */
1336 if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1337 printk(KERN_ERR "Invalid chain id\n");
1338 return -EINVAL;
1339 }
1340
1341 /* Check if the chain exists */
1342 if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1343 printk(KERN_ERR "Chain doesn't exists\n");
1344 return -EINVAL;
1345 }
1346
1347 channels = dma_linked_lch[chain_id].linked_dmach_q;
1348 for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
1349 dma_chan[channels[i]].next_linked_ch = -1;
1350 dma_chan[channels[i]].prev_linked_ch = -1;
1351 dma_chan[channels[i]].chain_id = -1;
1352 dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
1353 omap_free_dma(channels[i]);
1354 }
1355
1356 kfree(channels);
1357
1358 dma_linked_lch[chain_id].linked_dmach_q = NULL;
1359 dma_linked_lch[chain_id].chain_mode = -1;
1360 dma_linked_lch[chain_id].chain_state = -1;
1361
1362 return (0);
1363 }
1364 EXPORT_SYMBOL(omap_free_dma_chain);
1365
1366 /**
1367 * @brief omap_dma_chain_status - Check if the chain is in
1368 * active / inactive state.
1369 * @param chain_id
1370 *
1371 * @return - Success : OMAP_DMA_CHAIN_ACTIVE/OMAP_DMA_CHAIN_INACTIVE
1372 * Failure : -EINVAL
1373 */
1374 int omap_dma_chain_status(int chain_id)
1375 {
1376 /* Check for input params */
1377 if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1378 printk(KERN_ERR "Invalid chain id\n");
1379 return -EINVAL;
1380 }
1381
1382 /* Check if the chain exists */
1383 if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1384 printk(KERN_ERR "Chain doesn't exists\n");
1385 return -EINVAL;
1386 }
1387 pr_debug("CHAINID=%d, qcnt=%d\n", chain_id,
1388 dma_linked_lch[chain_id].q_count);
1389
1390 if (OMAP_DMA_CHAIN_QEMPTY(chain_id))
1391 return OMAP_DMA_CHAIN_INACTIVE;
1392
1393 return OMAP_DMA_CHAIN_ACTIVE;
1394 }
1395 EXPORT_SYMBOL(omap_dma_chain_status);
1396
1397 /**
1398 * @brief omap_dma_chain_a_transfer - Get a free channel from a chain,
1399 * set the params and start the transfer.
1400 *
1401 * @param chain_id
1402 * @param src_start - buffer start address
1403 * @param dest_start - Dest address
1404 * @param elem_count
1405 * @param frame_count
1406 * @param callbk_data - channel callback parameter data.
1407 *
1408 * @return - Success : 0
1409 * Failure: -EINVAL/-EBUSY
1410 */
1411 int omap_dma_chain_a_transfer(int chain_id, int src_start, int dest_start,
1412 int elem_count, int frame_count, void *callbk_data)
1413 {
1414 int *channels;
1415 u32 l, lch;
1416 int start_dma = 0;
1417
1418 /*
1419 * if buffer size is less than 1 then there is
1420 * no use of starting the chain
1421 */
1422 if (elem_count < 1) {
1423 printk(KERN_ERR "Invalid buffer size\n");
1424 return -EINVAL;
1425 }
1426
1427 /* Check for input params */
1428 if (unlikely((chain_id < 0
1429 || chain_id >= dma_lch_count))) {
1430 printk(KERN_ERR "Invalid chain id\n");
1431 return -EINVAL;
1432 }
1433
1434 /* Check if the chain exists */
1435 if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1436 printk(KERN_ERR "Chain doesn't exist\n");
1437 return -EINVAL;
1438 }
1439
1440 /* Check if all the channels in chain are in use */
1441 if (OMAP_DMA_CHAIN_QFULL(chain_id))
1442 return -EBUSY;
1443
1444 /* Frame count may be negative in case of indexed transfers */
1445 channels = dma_linked_lch[chain_id].linked_dmach_q;
1446
1447 /* Get a free channel */
1448 lch = channels[dma_linked_lch[chain_id].q_tail];
1449
1450 /* Store the callback data */
1451 dma_chan[lch].data = callbk_data;
1452
1453 /* Increment the q_tail */
1454 OMAP_DMA_CHAIN_INCQTAIL(chain_id);
1455
1456 /* Set the params to the free channel */
1457 if (src_start != 0)
1458 dma_write(src_start, CSSA(lch));
1459 if (dest_start != 0)
1460 dma_write(dest_start, CDSA(lch));
1461
1462 /* Write the buffer size */
1463 dma_write(elem_count, CEN(lch));
1464 dma_write(frame_count, CFN(lch));
1465
1466 /*
1467 * If the chain is dynamically linked,
1468 * then we may have to start the chain if its not active
1469 */
1470 if (dma_linked_lch[chain_id].chain_mode == OMAP_DMA_DYNAMIC_CHAIN) {
1471
1472 /*
1473 * In Dynamic chain, if the chain is not started,
1474 * queue the channel
1475 */
1476 if (dma_linked_lch[chain_id].chain_state ==
1477 DMA_CHAIN_NOTSTARTED) {
1478 /* Enable the link in previous channel */
1479 if (dma_chan[dma_chan[lch].prev_linked_ch].state ==
1480 DMA_CH_QUEUED)
1481 enable_lnk(dma_chan[lch].prev_linked_ch);
1482 dma_chan[lch].state = DMA_CH_QUEUED;
1483 }
1484
1485 /*
1486 * Chain is already started, make sure its active,
1487 * if not then start the chain
1488 */
1489 else {
1490 start_dma = 1;
1491
1492 if (dma_chan[dma_chan[lch].prev_linked_ch].state ==
1493 DMA_CH_STARTED) {
1494 enable_lnk(dma_chan[lch].prev_linked_ch);
1495 dma_chan[lch].state = DMA_CH_QUEUED;
1496 start_dma = 0;
1497 if (0 == ((1 << 7) & dma_read(
1498 CCR(dma_chan[lch].prev_linked_ch)))) {
1499 disable_lnk(dma_chan[lch].
1500 prev_linked_ch);
1501 pr_debug("\n prev ch is stopped\n");
1502 start_dma = 1;
1503 }
1504 }
1505
1506 else if (dma_chan[dma_chan[lch].prev_linked_ch].state
1507 == DMA_CH_QUEUED) {
1508 enable_lnk(dma_chan[lch].prev_linked_ch);
1509 dma_chan[lch].state = DMA_CH_QUEUED;
1510 start_dma = 0;
1511 }
1512 omap_enable_channel_irq(lch);
1513
1514 l = dma_read(CCR(lch));
1515
1516 if ((0 == (l & (1 << 24))))
1517 l &= ~(1 << 25);
1518 else
1519 l |= (1 << 25);
1520 if (start_dma == 1) {
1521 if (0 == (l & (1 << 7))) {
1522 l |= (1 << 7);
1523 dma_chan[lch].state = DMA_CH_STARTED;
1524 pr_debug("starting %d\n", lch);
1525 dma_write(l, CCR(lch));
1526 } else
1527 start_dma = 0;
1528 } else {
1529 if (0 == (l & (1 << 7)))
1530 dma_write(l, CCR(lch));
1531 }
1532 dma_chan[lch].flags |= OMAP_DMA_ACTIVE;
1533 }
1534 }
1535
1536 return 0;
1537 }
1538 EXPORT_SYMBOL(omap_dma_chain_a_transfer);
1539
1540 /**
1541 * @brief omap_start_dma_chain_transfers - Start the chain
1542 *
1543 * @param chain_id
1544 *
1545 * @return - Success : 0
1546 * Failure : -EINVAL/-EBUSY
1547 */
1548 int omap_start_dma_chain_transfers(int chain_id)
1549 {
1550 int *channels;
1551 u32 l, i;
1552
1553 if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1554 printk(KERN_ERR "Invalid chain id\n");
1555 return -EINVAL;
1556 }
1557
1558 channels = dma_linked_lch[chain_id].linked_dmach_q;
1559
1560 if (dma_linked_lch[channels[0]].chain_state == DMA_CHAIN_STARTED) {
1561 printk(KERN_ERR "Chain is already started\n");
1562 return -EBUSY;
1563 }
1564
1565 if (dma_linked_lch[chain_id].chain_mode == OMAP_DMA_STATIC_CHAIN) {
1566 for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked;
1567 i++) {
1568 enable_lnk(channels[i]);
1569 omap_enable_channel_irq(channels[i]);
1570 }
1571 } else {
1572 omap_enable_channel_irq(channels[0]);
1573 }
1574
1575 l = dma_read(CCR(channels[0]));
1576 l |= (1 << 7);
1577 dma_linked_lch[chain_id].chain_state = DMA_CHAIN_STARTED;
1578 dma_chan[channels[0]].state = DMA_CH_STARTED;
1579
1580 if ((0 == (l & (1 << 24))))
1581 l &= ~(1 << 25);
1582 else
1583 l |= (1 << 25);
1584 dma_write(l, CCR(channels[0]));
1585
1586 dma_chan[channels[0]].flags |= OMAP_DMA_ACTIVE;
1587
1588 return 0;
1589 }
1590 EXPORT_SYMBOL(omap_start_dma_chain_transfers);
1591
1592 /**
1593 * @brief omap_stop_dma_chain_transfers - Stop the dma transfer of a chain.
1594 *
1595 * @param chain_id
1596 *
1597 * @return - Success : 0
1598 * Failure : EINVAL
1599 */
1600 int omap_stop_dma_chain_transfers(int chain_id)
1601 {
1602 int *channels;
1603 u32 l, i;
1604 u32 sys_cf;
1605
1606 /* Check for input params */
1607 if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1608 printk(KERN_ERR "Invalid chain id\n");
1609 return -EINVAL;
1610 }
1611
1612 /* Check if the chain exists */
1613 if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1614 printk(KERN_ERR "Chain doesn't exists\n");
1615 return -EINVAL;
1616 }
1617 channels = dma_linked_lch[chain_id].linked_dmach_q;
1618
1619 /*
1620 * DMA Errata:
1621 * Special programming model needed to disable DMA before end of block
1622 */
1623 sys_cf = dma_read(OCP_SYSCONFIG);
1624 l = sys_cf;
1625 /* Middle mode reg set no Standby */
1626 l &= ~((1 << 12)|(1 << 13));
1627 dma_write(l, OCP_SYSCONFIG);
1628
1629 for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
1630
1631 /* Stop the Channel transmission */
1632 l = dma_read(CCR(channels[i]));
1633 l &= ~(1 << 7);
1634 dma_write(l, CCR(channels[i]));
1635
1636 /* Disable the link in all the channels */
1637 disable_lnk(channels[i]);
1638 dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
1639
1640 }
1641 dma_linked_lch[chain_id].chain_state = DMA_CHAIN_NOTSTARTED;
1642
1643 /* Reset the Queue pointers */
1644 OMAP_DMA_CHAIN_QINIT(chain_id);
1645
1646 /* Errata - put in the old value */
1647 dma_write(sys_cf, OCP_SYSCONFIG);
1648
1649 return 0;
1650 }
1651 EXPORT_SYMBOL(omap_stop_dma_chain_transfers);
1652
1653 /* Get the index of the ongoing DMA in chain */
1654 /**
1655 * @brief omap_get_dma_chain_index - Get the element and frame index
1656 * of the ongoing DMA in chain
1657 *
1658 * @param chain_id
1659 * @param ei - Element index
1660 * @param fi - Frame index
1661 *
1662 * @return - Success : 0
1663 * Failure : -EINVAL
1664 */
1665 int omap_get_dma_chain_index(int chain_id, int *ei, int *fi)
1666 {
1667 int lch;
1668 int *channels;
1669
1670 /* Check for input params */
1671 if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1672 printk(KERN_ERR "Invalid chain id\n");
1673 return -EINVAL;
1674 }
1675
1676 /* Check if the chain exists */
1677 if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1678 printk(KERN_ERR "Chain doesn't exists\n");
1679 return -EINVAL;
1680 }
1681 if ((!ei) || (!fi))
1682 return -EINVAL;
1683
1684 channels = dma_linked_lch[chain_id].linked_dmach_q;
1685
1686 /* Get the current channel */
1687 lch = channels[dma_linked_lch[chain_id].q_head];
1688
1689 *ei = dma_read(CCEN(lch));
1690 *fi = dma_read(CCFN(lch));
1691
1692 return 0;
1693 }
1694 EXPORT_SYMBOL(omap_get_dma_chain_index);
1695
1696 /**
1697 * @brief omap_get_dma_chain_dst_pos - Get the destination position of the
1698 * ongoing DMA in chain
1699 *
1700 * @param chain_id
1701 *
1702 * @return - Success : Destination position
1703 * Failure : -EINVAL
1704 */
1705 int omap_get_dma_chain_dst_pos(int chain_id)
1706 {
1707 int lch;
1708 int *channels;
1709
1710 /* Check for input params */
1711 if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1712 printk(KERN_ERR "Invalid chain id\n");
1713 return -EINVAL;
1714 }
1715
1716 /* Check if the chain exists */
1717 if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1718 printk(KERN_ERR "Chain doesn't exists\n");
1719 return -EINVAL;
1720 }
1721
1722 channels = dma_linked_lch[chain_id].linked_dmach_q;
1723
1724 /* Get the current channel */
1725 lch = channels[dma_linked_lch[chain_id].q_head];
1726
1727 return dma_read(CDAC(lch));
1728 }
1729 EXPORT_SYMBOL(omap_get_dma_chain_dst_pos);
1730
1731 /**
1732 * @brief omap_get_dma_chain_src_pos - Get the source position
1733 * of the ongoing DMA in chain
1734 * @param chain_id
1735 *
1736 * @return - Success : Destination position
1737 * Failure : -EINVAL
1738 */
1739 int omap_get_dma_chain_src_pos(int chain_id)
1740 {
1741 int lch;
1742 int *channels;
1743
1744 /* Check for input params */
1745 if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1746 printk(KERN_ERR "Invalid chain id\n");
1747 return -EINVAL;
1748 }
1749
1750 /* Check if the chain exists */
1751 if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1752 printk(KERN_ERR "Chain doesn't exists\n");
1753 return -EINVAL;
1754 }
1755
1756 channels = dma_linked_lch[chain_id].linked_dmach_q;
1757
1758 /* Get the current channel */
1759 lch = channels[dma_linked_lch[chain_id].q_head];
1760
1761 return dma_read(CSAC(lch));
1762 }
1763 EXPORT_SYMBOL(omap_get_dma_chain_src_pos);
1764 #endif /* ifndef CONFIG_ARCH_OMAP1 */
1765
1766 /*----------------------------------------------------------------------------*/
1767
1768 #ifdef CONFIG_ARCH_OMAP1
1769
1770 static int omap1_dma_handle_ch(int ch)
1771 {
1772 u32 csr;
1773
1774 if (enable_1510_mode && ch >= 6) {
1775 csr = dma_chan[ch].saved_csr;
1776 dma_chan[ch].saved_csr = 0;
1777 } else
1778 csr = dma_read(CSR(ch));
1779 if (enable_1510_mode && ch <= 2 && (csr >> 7) != 0) {
1780 dma_chan[ch + 6].saved_csr = csr >> 7;
1781 csr &= 0x7f;
1782 }
1783 if ((csr & 0x3f) == 0)
1784 return 0;
1785 if (unlikely(dma_chan[ch].dev_id == -1)) {
1786 printk(KERN_WARNING "Spurious interrupt from DMA channel "
1787 "%d (CSR %04x)\n", ch, csr);
1788 return 0;
1789 }
1790 if (unlikely(csr & OMAP1_DMA_TOUT_IRQ))
1791 printk(KERN_WARNING "DMA timeout with device %d\n",
1792 dma_chan[ch].dev_id);
1793 if (unlikely(csr & OMAP_DMA_DROP_IRQ))
1794 printk(KERN_WARNING "DMA synchronization event drop occurred "
1795 "with device %d\n", dma_chan[ch].dev_id);
1796 if (likely(csr & OMAP_DMA_BLOCK_IRQ))
1797 dma_chan[ch].flags &= ~OMAP_DMA_ACTIVE;
1798 if (likely(dma_chan[ch].callback != NULL))
1799 dma_chan[ch].callback(ch, csr, dma_chan[ch].data);
1800
1801 return 1;
1802 }
1803
1804 static irqreturn_t omap1_dma_irq_handler(int irq, void *dev_id)
1805 {
1806 int ch = ((int) dev_id) - 1;
1807 int handled = 0;
1808
1809 for (;;) {
1810 int handled_now = 0;
1811
1812 handled_now += omap1_dma_handle_ch(ch);
1813 if (enable_1510_mode && dma_chan[ch + 6].saved_csr)
1814 handled_now += omap1_dma_handle_ch(ch + 6);
1815 if (!handled_now)
1816 break;
1817 handled += handled_now;
1818 }
1819
1820 return handled ? IRQ_HANDLED : IRQ_NONE;
1821 }
1822
1823 #else
1824 #define omap1_dma_irq_handler NULL
1825 #endif
1826
1827 #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
1828
1829 static int omap2_dma_handle_ch(int ch)
1830 {
1831 u32 status = dma_read(CSR(ch));
1832
1833 if (!status) {
1834 if (printk_ratelimit())
1835 printk(KERN_WARNING "Spurious DMA IRQ for lch %d\n",
1836 ch);
1837 dma_write(1 << ch, IRQSTATUS_L0);
1838 return 0;
1839 }
1840 if (unlikely(dma_chan[ch].dev_id == -1)) {
1841 if (printk_ratelimit())
1842 printk(KERN_WARNING "IRQ %04x for non-allocated DMA"
1843 "channel %d\n", status, ch);
1844 return 0;
1845 }
1846 if (unlikely(status & OMAP_DMA_DROP_IRQ))
1847 printk(KERN_INFO
1848 "DMA synchronization event drop occurred with device "
1849 "%d\n", dma_chan[ch].dev_id);
1850 if (unlikely(status & OMAP2_DMA_TRANS_ERR_IRQ)) {
1851 printk(KERN_INFO "DMA transaction error with device %d\n",
1852 dma_chan[ch].dev_id);
1853 if (cpu_class_is_omap2()) {
1854 /* Errata: sDMA Channel is not disabled
1855 * after a transaction error. So we explicitely
1856 * disable the channel
1857 */
1858 u32 ccr;
1859
1860 ccr = dma_read(CCR(ch));
1861 ccr &= ~OMAP_DMA_CCR_EN;
1862 dma_write(ccr, CCR(ch));
1863 dma_chan[ch].flags &= ~OMAP_DMA_ACTIVE;
1864 }
1865 }
1866 if (unlikely(status & OMAP2_DMA_SECURE_ERR_IRQ))
1867 printk(KERN_INFO "DMA secure error with device %d\n",
1868 dma_chan[ch].dev_id);
1869 if (unlikely(status & OMAP2_DMA_MISALIGNED_ERR_IRQ))
1870 printk(KERN_INFO "DMA misaligned error with device %d\n",
1871 dma_chan[ch].dev_id);
1872
1873 dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR(ch));
1874 dma_write(1 << ch, IRQSTATUS_L0);
1875
1876 /* If the ch is not chained then chain_id will be -1 */
1877 if (dma_chan[ch].chain_id != -1) {
1878 int chain_id = dma_chan[ch].chain_id;
1879 dma_chan[ch].state = DMA_CH_NOTSTARTED;
1880 if (dma_read(CLNK_CTRL(ch)) & (1 << 15))
1881 dma_chan[dma_chan[ch].next_linked_ch].state =
1882 DMA_CH_STARTED;
1883 if (dma_linked_lch[chain_id].chain_mode ==
1884 OMAP_DMA_DYNAMIC_CHAIN)
1885 disable_lnk(ch);
1886
1887 if (!OMAP_DMA_CHAIN_QEMPTY(chain_id))
1888 OMAP_DMA_CHAIN_INCQHEAD(chain_id);
1889
1890 status = dma_read(CSR(ch));
1891 }
1892
1893 dma_write(status, CSR(ch));
1894
1895 if (likely(dma_chan[ch].callback != NULL))
1896 dma_chan[ch].callback(ch, status, dma_chan[ch].data);
1897
1898 return 0;
1899 }
1900
1901 /* STATUS register count is from 1-32 while our is 0-31 */
1902 static irqreturn_t omap2_dma_irq_handler(int irq, void *dev_id)
1903 {
1904 u32 val, enable_reg;
1905 int i;
1906
1907 val = dma_read(IRQSTATUS_L0);
1908 if (val == 0) {
1909 if (printk_ratelimit())
1910 printk(KERN_WARNING "Spurious DMA IRQ\n");
1911 return IRQ_HANDLED;
1912 }
1913 enable_reg = dma_read(IRQENABLE_L0);
1914 val &= enable_reg; /* Dispatch only relevant interrupts */
1915 for (i = 0; i < dma_lch_count && val != 0; i++) {
1916 if (val & 1)
1917 omap2_dma_handle_ch(i);
1918 val >>= 1;
1919 }
1920
1921 return IRQ_HANDLED;
1922 }
1923
1924 static struct irqaction omap24xx_dma_irq = {
1925 .name = "DMA",
1926 .handler = omap2_dma_irq_handler,
1927 .flags = IRQF_DISABLED
1928 };
1929
1930 #else
1931 static struct irqaction omap24xx_dma_irq;
1932 #endif
1933
1934 /*----------------------------------------------------------------------------*/
1935
1936 static struct lcd_dma_info {
1937 spinlock_t lock;
1938 int reserved;
1939 void (*callback)(u16 status, void *data);
1940 void *cb_data;
1941
1942 int active;
1943 unsigned long addr, size;
1944 int rotate, data_type, xres, yres;
1945 int vxres;
1946 int mirror;
1947 int xscale, yscale;
1948 int ext_ctrl;
1949 int src_port;
1950 int single_transfer;
1951 } lcd_dma;
1952
1953 void omap_set_lcd_dma_b1(unsigned long addr, u16 fb_xres, u16 fb_yres,
1954 int data_type)
1955 {
1956 lcd_dma.addr = addr;
1957 lcd_dma.data_type = data_type;
1958 lcd_dma.xres = fb_xres;
1959 lcd_dma.yres = fb_yres;
1960 }
1961 EXPORT_SYMBOL(omap_set_lcd_dma_b1);
1962
1963 void omap_set_lcd_dma_src_port(int port)
1964 {
1965 lcd_dma.src_port = port;
1966 }
1967
1968 void omap_set_lcd_dma_ext_controller(int external)
1969 {
1970 lcd_dma.ext_ctrl = external;
1971 }
1972 EXPORT_SYMBOL(omap_set_lcd_dma_ext_controller);
1973
1974 void omap_set_lcd_dma_single_transfer(int single)
1975 {
1976 lcd_dma.single_transfer = single;
1977 }
1978 EXPORT_SYMBOL(omap_set_lcd_dma_single_transfer);
1979
1980 void omap_set_lcd_dma_b1_rotation(int rotate)
1981 {
1982 if (omap_dma_in_1510_mode()) {
1983 printk(KERN_ERR "DMA rotation is not supported in 1510 mode\n");
1984 BUG();
1985 return;
1986 }
1987 lcd_dma.rotate = rotate;
1988 }
1989 EXPORT_SYMBOL(omap_set_lcd_dma_b1_rotation);
1990
1991 void omap_set_lcd_dma_b1_mirror(int mirror)
1992 {
1993 if (omap_dma_in_1510_mode()) {
1994 printk(KERN_ERR "DMA mirror is not supported in 1510 mode\n");
1995 BUG();
1996 }
1997 lcd_dma.mirror = mirror;
1998 }
1999 EXPORT_SYMBOL(omap_set_lcd_dma_b1_mirror);
2000
2001 void omap_set_lcd_dma_b1_vxres(unsigned long vxres)
2002 {
2003 if (omap_dma_in_1510_mode()) {
2004 printk(KERN_ERR "DMA virtual resulotion is not supported "
2005 "in 1510 mode\n");
2006 BUG();
2007 }
2008 lcd_dma.vxres = vxres;
2009 }
2010 EXPORT_SYMBOL(omap_set_lcd_dma_b1_vxres);
2011
2012 void omap_set_lcd_dma_b1_scale(unsigned int xscale, unsigned int yscale)
2013 {
2014 if (omap_dma_in_1510_mode()) {
2015 printk(KERN_ERR "DMA scale is not supported in 1510 mode\n");
2016 BUG();
2017 }
2018 lcd_dma.xscale = xscale;
2019 lcd_dma.yscale = yscale;
2020 }
2021 EXPORT_SYMBOL(omap_set_lcd_dma_b1_scale);
2022
2023 static void set_b1_regs(void)
2024 {
2025 unsigned long top, bottom;
2026 int es;
2027 u16 w;
2028 unsigned long en, fn;
2029 long ei, fi;
2030 unsigned long vxres;
2031 unsigned int xscale, yscale;
2032
2033 switch (lcd_dma.data_type) {
2034 case OMAP_DMA_DATA_TYPE_S8:
2035 es = 1;
2036 break;
2037 case OMAP_DMA_DATA_TYPE_S16:
2038 es = 2;
2039 break;
2040 case OMAP_DMA_DATA_TYPE_S32:
2041 es = 4;
2042 break;
2043 default:
2044 BUG();
2045 return;
2046 }
2047
2048 vxres = lcd_dma.vxres ? lcd_dma.vxres : lcd_dma.xres;
2049 xscale = lcd_dma.xscale ? lcd_dma.xscale : 1;
2050 yscale = lcd_dma.yscale ? lcd_dma.yscale : 1;
2051 BUG_ON(vxres < lcd_dma.xres);
2052
2053 #define PIXADDR(x, y) (lcd_dma.addr + \
2054 ((y) * vxres * yscale + (x) * xscale) * es)
2055 #define PIXSTEP(sx, sy, dx, dy) (PIXADDR(dx, dy) - PIXADDR(sx, sy) - es + 1)
2056
2057 switch (lcd_dma.rotate) {
2058 case 0:
2059 if (!lcd_dma.mirror) {
2060 top = PIXADDR(0, 0);
2061 bottom = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
2062 /* 1510 DMA requires the bottom address to be 2 more
2063 * than the actual last memory access location. */
2064 if (omap_dma_in_1510_mode() &&
2065 lcd_dma.data_type == OMAP_DMA_DATA_TYPE_S32)
2066 bottom += 2;
2067 ei = PIXSTEP(0, 0, 1, 0);
2068 fi = PIXSTEP(lcd_dma.xres - 1, 0, 0, 1);
2069 } else {
2070 top = PIXADDR(lcd_dma.xres - 1, 0);
2071 bottom = PIXADDR(0, lcd_dma.yres - 1);
2072 ei = PIXSTEP(1, 0, 0, 0);
2073 fi = PIXSTEP(0, 0, lcd_dma.xres - 1, 1);
2074 }
2075 en = lcd_dma.xres;
2076 fn = lcd_dma.yres;
2077 break;
2078 case 90:
2079 if (!lcd_dma.mirror) {
2080 top = PIXADDR(0, lcd_dma.yres - 1);
2081 bottom = PIXADDR(lcd_dma.xres - 1, 0);
2082 ei = PIXSTEP(0, 1, 0, 0);
2083 fi = PIXSTEP(0, 0, 1, lcd_dma.yres - 1);
2084 } else {
2085 top = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
2086 bottom = PIXADDR(0, 0);
2087 ei = PIXSTEP(0, 1, 0, 0);
2088 fi = PIXSTEP(1, 0, 0, lcd_dma.yres - 1);
2089 }
2090 en = lcd_dma.yres;
2091 fn = lcd_dma.xres;
2092 break;
2093 case 180:
2094 if (!lcd_dma.mirror) {
2095 top = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
2096 bottom = PIXADDR(0, 0);
2097 ei = PIXSTEP(1, 0, 0, 0);
2098 fi = PIXSTEP(0, 1, lcd_dma.xres - 1, 0);
2099 } else {
2100 top = PIXADDR(0, lcd_dma.yres - 1);
2101 bottom = PIXADDR(lcd_dma.xres - 1, 0);
2102 ei = PIXSTEP(0, 0, 1, 0);
2103 fi = PIXSTEP(lcd_dma.xres - 1, 1, 0, 0);
2104 }
2105 en = lcd_dma.xres;
2106 fn = lcd_dma.yres;
2107 break;
2108 case 270:
2109 if (!lcd_dma.mirror) {
2110 top = PIXADDR(lcd_dma.xres - 1, 0);
2111 bottom = PIXADDR(0, lcd_dma.yres - 1);
2112 ei = PIXSTEP(0, 0, 0, 1);
2113 fi = PIXSTEP(1, lcd_dma.yres - 1, 0, 0);
2114 } else {
2115 top = PIXADDR(0, 0);
2116 bottom = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
2117 ei = PIXSTEP(0, 0, 0, 1);
2118 fi = PIXSTEP(0, lcd_dma.yres - 1, 1, 0);
2119 }
2120 en = lcd_dma.yres;
2121 fn = lcd_dma.xres;
2122 break;
2123 default:
2124 BUG();
2125 return; /* Suppress warning about uninitialized vars */
2126 }
2127
2128 if (omap_dma_in_1510_mode()) {
2129 omap_writew(top >> 16, OMAP1510_DMA_LCD_TOP_F1_U);
2130 omap_writew(top, OMAP1510_DMA_LCD_TOP_F1_L);
2131 omap_writew(bottom >> 16, OMAP1510_DMA_LCD_BOT_F1_U);
2132 omap_writew(bottom, OMAP1510_DMA_LCD_BOT_F1_L);
2133
2134 return;
2135 }
2136
2137 /* 1610 regs */
2138 omap_writew(top >> 16, OMAP1610_DMA_LCD_TOP_B1_U);
2139 omap_writew(top, OMAP1610_DMA_LCD_TOP_B1_L);
2140 omap_writew(bottom >> 16, OMAP1610_DMA_LCD_BOT_B1_U);
2141 omap_writew(bottom, OMAP1610_DMA_LCD_BOT_B1_L);
2142
2143 omap_writew(en, OMAP1610_DMA_LCD_SRC_EN_B1);
2144 omap_writew(fn, OMAP1610_DMA_LCD_SRC_FN_B1);
2145
2146 w = omap_readw(OMAP1610_DMA_LCD_CSDP);
2147 w &= ~0x03;
2148 w |= lcd_dma.data_type;
2149 omap_writew(w, OMAP1610_DMA_LCD_CSDP);
2150
2151 w = omap_readw(OMAP1610_DMA_LCD_CTRL);
2152 /* Always set the source port as SDRAM for now*/
2153 w &= ~(0x03 << 6);
2154 if (lcd_dma.callback != NULL)
2155 w |= 1 << 1; /* Block interrupt enable */
2156 else
2157 w &= ~(1 << 1);
2158 omap_writew(w, OMAP1610_DMA_LCD_CTRL);
2159
2160 if (!(lcd_dma.rotate || lcd_dma.mirror ||
2161 lcd_dma.vxres || lcd_dma.xscale || lcd_dma.yscale))
2162 return;
2163
2164 w = omap_readw(OMAP1610_DMA_LCD_CCR);
2165 /* Set the double-indexed addressing mode */
2166 w |= (0x03 << 12);
2167 omap_writew(w, OMAP1610_DMA_LCD_CCR);
2168
2169 omap_writew(ei, OMAP1610_DMA_LCD_SRC_EI_B1);
2170 omap_writew(fi >> 16, OMAP1610_DMA_LCD_SRC_FI_B1_U);
2171 omap_writew(fi, OMAP1610_DMA_LCD_SRC_FI_B1_L);
2172 }
2173
2174 static irqreturn_t lcd_dma_irq_handler(int irq, void *dev_id)
2175 {
2176 u16 w;
2177
2178 w = omap_readw(OMAP1610_DMA_LCD_CTRL);
2179 if (unlikely(!(w & (1 << 3)))) {
2180 printk(KERN_WARNING "Spurious LCD DMA IRQ\n");
2181 return IRQ_NONE;
2182 }
2183 /* Ack the IRQ */
2184 w |= (1 << 3);
2185 omap_writew(w, OMAP1610_DMA_LCD_CTRL);
2186 lcd_dma.active = 0;
2187 if (lcd_dma.callback != NULL)
2188 lcd_dma.callback(w, lcd_dma.cb_data);
2189
2190 return IRQ_HANDLED;
2191 }
2192
2193 int omap_request_lcd_dma(void (*callback)(u16 status, void *data),
2194 void *data)
2195 {
2196 spin_lock_irq(&lcd_dma.lock);
2197 if (lcd_dma.reserved) {
2198 spin_unlock_irq(&lcd_dma.lock);
2199 printk(KERN_ERR "LCD DMA channel already reserved\n");
2200 BUG();
2201 return -EBUSY;
2202 }
2203 lcd_dma.reserved = 1;
2204 spin_unlock_irq(&lcd_dma.lock);
2205 lcd_dma.callback = callback;
2206 lcd_dma.cb_data = data;
2207 lcd_dma.active = 0;
2208 lcd_dma.single_transfer = 0;
2209 lcd_dma.rotate = 0;
2210 lcd_dma.vxres = 0;
2211 lcd_dma.mirror = 0;
2212 lcd_dma.xscale = 0;
2213 lcd_dma.yscale = 0;
2214 lcd_dma.ext_ctrl = 0;
2215 lcd_dma.src_port = 0;
2216
2217 return 0;
2218 }
2219 EXPORT_SYMBOL(omap_request_lcd_dma);
2220
2221 void omap_free_lcd_dma(void)
2222 {
2223 spin_lock(&lcd_dma.lock);
2224 if (!lcd_dma.reserved) {
2225 spin_unlock(&lcd_dma.lock);
2226 printk(KERN_ERR "LCD DMA is not reserved\n");
2227 BUG();
2228 return;
2229 }
2230 if (!enable_1510_mode)
2231 omap_writew(omap_readw(OMAP1610_DMA_LCD_CCR) & ~1,
2232 OMAP1610_DMA_LCD_CCR);
2233 lcd_dma.reserved = 0;
2234 spin_unlock(&lcd_dma.lock);
2235 }
2236 EXPORT_SYMBOL(omap_free_lcd_dma);
2237
2238 void omap_enable_lcd_dma(void)
2239 {
2240 u16 w;
2241
2242 /*
2243 * Set the Enable bit only if an external controller is
2244 * connected. Otherwise the OMAP internal controller will
2245 * start the transfer when it gets enabled.
2246 */
2247 if (enable_1510_mode || !lcd_dma.ext_ctrl)
2248 return;
2249
2250 w = omap_readw(OMAP1610_DMA_LCD_CTRL);
2251 w |= 1 << 8;
2252 omap_writew(w, OMAP1610_DMA_LCD_CTRL);
2253
2254 lcd_dma.active = 1;
2255
2256 w = omap_readw(OMAP1610_DMA_LCD_CCR);
2257 w |= 1 << 7;
2258 omap_writew(w, OMAP1610_DMA_LCD_CCR);
2259 }
2260 EXPORT_SYMBOL(omap_enable_lcd_dma);
2261
2262 void omap_setup_lcd_dma(void)
2263 {
2264 BUG_ON(lcd_dma.active);
2265 if (!enable_1510_mode) {
2266 /* Set some reasonable defaults */
2267 omap_writew(0x5440, OMAP1610_DMA_LCD_CCR);
2268 omap_writew(0x9102, OMAP1610_DMA_LCD_CSDP);
2269 omap_writew(0x0004, OMAP1610_DMA_LCD_LCH_CTRL);
2270 }
2271 set_b1_regs();
2272 if (!enable_1510_mode) {
2273 u16 w;
2274
2275 w = omap_readw(OMAP1610_DMA_LCD_CCR);
2276 /*
2277 * If DMA was already active set the end_prog bit to have
2278 * the programmed register set loaded into the active
2279 * register set.
2280 */
2281 w |= 1 << 11; /* End_prog */
2282 if (!lcd_dma.single_transfer)
2283 w |= (3 << 8); /* Auto_init, repeat */
2284 omap_writew(w, OMAP1610_DMA_LCD_CCR);
2285 }
2286 }
2287 EXPORT_SYMBOL(omap_setup_lcd_dma);
2288
2289 void omap_stop_lcd_dma(void)
2290 {
2291 u16 w;
2292
2293 lcd_dma.active = 0;
2294 if (enable_1510_mode || !lcd_dma.ext_ctrl)
2295 return;
2296
2297 w = omap_readw(OMAP1610_DMA_LCD_CCR);
2298 w &= ~(1 << 7);
2299 omap_writew(w, OMAP1610_DMA_LCD_CCR);
2300
2301 w = omap_readw(OMAP1610_DMA_LCD_CTRL);
2302 w &= ~(1 << 8);
2303 omap_writew(w, OMAP1610_DMA_LCD_CTRL);
2304 }
2305 EXPORT_SYMBOL(omap_stop_lcd_dma);
2306
2307 /*----------------------------------------------------------------------------*/
2308
2309 static int __init omap_init_dma(void)
2310 {
2311 int ch, r;
2312
2313 if (cpu_class_is_omap1()) {
2314 omap_dma_base = IO_ADDRESS(OMAP1_DMA_BASE);
2315 dma_lch_count = OMAP1_LOGICAL_DMA_CH_COUNT;
2316 } else if (cpu_is_omap24xx()) {
2317 omap_dma_base = IO_ADDRESS(OMAP24XX_DMA4_BASE);
2318 dma_lch_count = OMAP_DMA4_LOGICAL_DMA_CH_COUNT;
2319 } else if (cpu_is_omap34xx()) {
2320 omap_dma_base = IO_ADDRESS(OMAP34XX_DMA4_BASE);
2321 dma_lch_count = OMAP_DMA4_LOGICAL_DMA_CH_COUNT;
2322 } else {
2323 pr_err("DMA init failed for unsupported omap\n");
2324 return -ENODEV;
2325 }
2326
2327 if (cpu_class_is_omap2() && omap_dma_reserve_channels
2328 && (omap_dma_reserve_channels <= dma_lch_count))
2329 dma_lch_count = omap_dma_reserve_channels;
2330
2331 dma_chan = kzalloc(sizeof(struct omap_dma_lch) * dma_lch_count,
2332 GFP_KERNEL);
2333 if (!dma_chan)
2334 return -ENOMEM;
2335
2336 if (cpu_class_is_omap2()) {
2337 dma_linked_lch = kzalloc(sizeof(struct dma_link_info) *
2338 dma_lch_count, GFP_KERNEL);
2339 if (!dma_linked_lch) {
2340 kfree(dma_chan);
2341 return -ENOMEM;
2342 }
2343 }
2344
2345 if (cpu_is_omap15xx()) {
2346 printk(KERN_INFO "DMA support for OMAP15xx initialized\n");
2347 dma_chan_count = 9;
2348 enable_1510_mode = 1;
2349 } else if (cpu_is_omap16xx() || cpu_is_omap7xx()) {
2350 printk(KERN_INFO "OMAP DMA hardware version %d\n",
2351 dma_read(HW_ID));
2352 printk(KERN_INFO "DMA capabilities: %08x:%08x:%04x:%04x:%04x\n",
2353 (dma_read(CAPS_0_U) << 16) |
2354 dma_read(CAPS_0_L),
2355 (dma_read(CAPS_1_U) << 16) |
2356 dma_read(CAPS_1_L),
2357 dma_read(CAPS_2), dma_read(CAPS_3),
2358 dma_read(CAPS_4));
2359 if (!enable_1510_mode) {
2360 u16 w;
2361
2362 /* Disable OMAP 3.0/3.1 compatibility mode. */
2363 w = dma_read(GSCR);
2364 w |= 1 << 3;
2365 dma_write(w, GSCR);
2366 dma_chan_count = 16;
2367 } else
2368 dma_chan_count = 9;
2369 if (cpu_is_omap16xx()) {
2370 u16 w;
2371
2372 /* this would prevent OMAP sleep */
2373 w = omap_readw(OMAP1610_DMA_LCD_CTRL);
2374 w &= ~(1 << 8);
2375 omap_writew(w, OMAP1610_DMA_LCD_CTRL);
2376 }
2377 } else if (cpu_class_is_omap2()) {
2378 u8 revision = dma_read(REVISION) & 0xff;
2379 printk(KERN_INFO "OMAP DMA hardware revision %d.%d\n",
2380 revision >> 4, revision & 0xf);
2381 dma_chan_count = dma_lch_count;
2382 } else {
2383 dma_chan_count = 0;
2384 return 0;
2385 }
2386
2387 spin_lock_init(&lcd_dma.lock);
2388 spin_lock_init(&dma_chan_lock);
2389
2390 for (ch = 0; ch < dma_chan_count; ch++) {
2391 omap_clear_dma(ch);
2392 dma_chan[ch].dev_id = -1;
2393 dma_chan[ch].next_lch = -1;
2394
2395 if (ch >= 6 && enable_1510_mode)
2396 continue;
2397
2398 if (cpu_class_is_omap1()) {
2399 /*
2400 * request_irq() doesn't like dev_id (ie. ch) being
2401 * zero, so we have to kludge around this.
2402 */
2403 r = request_irq(omap1_dma_irq[ch],
2404 omap1_dma_irq_handler, 0, "DMA",
2405 (void *) (ch + 1));
2406 if (r != 0) {
2407 int i;
2408
2409 printk(KERN_ERR "unable to request IRQ %d "
2410 "for DMA (error %d)\n",
2411 omap1_dma_irq[ch], r);
2412 for (i = 0; i < ch; i++)
2413 free_irq(omap1_dma_irq[i],
2414 (void *) (i + 1));
2415 return r;
2416 }
2417 }
2418 }
2419
2420 if (cpu_is_omap2430() || cpu_is_omap34xx())
2421 omap_dma_set_global_params(DMA_DEFAULT_ARB_RATE,
2422 DMA_DEFAULT_FIFO_DEPTH, 0);
2423
2424 if (cpu_class_is_omap2())
2425 setup_irq(INT_24XX_SDMA_IRQ0, &omap24xx_dma_irq);
2426
2427 /* FIXME: Update LCD DMA to work on 24xx */
2428 if (cpu_class_is_omap1()) {
2429 r = request_irq(INT_DMA_LCD, lcd_dma_irq_handler, 0,
2430 "LCD DMA", NULL);
2431 if (r != 0) {
2432 int i;
2433
2434 printk(KERN_ERR "unable to request IRQ for LCD DMA "
2435 "(error %d)\n", r);
2436 for (i = 0; i < dma_chan_count; i++)
2437 free_irq(omap1_dma_irq[i], (void *) (i + 1));
2438 return r;
2439 }
2440 }
2441
2442 return 0;
2443 }
2444
2445 arch_initcall(omap_init_dma);
2446
2447 /*
2448 * Reserve the omap SDMA channels using cmdline bootarg
2449 * "omap_dma_reserve_ch=". The valid range is 1 to 32
2450 */
2451 static int __init omap_dma_cmdline_reserve_ch(char *str)
2452 {
2453 if (get_option(&str, &omap_dma_reserve_channels) != 1)
2454 omap_dma_reserve_channels = 0;
2455 return 1;
2456 }
2457
2458 __setup("omap_dma_reserve_ch=", omap_dma_cmdline_reserve_ch);
2459
2460
Linux kernel - Deliverables
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