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x86: cpa self-test, WARN_ON()
[wrt350n-kernel.git] / arch / arm / plat-omap / dma.c
blobdcbba07cf98aad648367b62b5d47bc2ba51b52e2
1 /*
2 * linux/arch/arm/plat-omap/dma.c
3 *
4 * Copyright (C) 2003 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 support Copyright (C) 2004-2005 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
29 #include <asm/system.h>
30 #include <asm/hardware.h>
31 #include <asm/dma.h>
32 #include <asm/io.h>
33
34 #include <asm/arch/tc.h>
35
36 #define DEBUG_PRINTS
37 #undef DEBUG_PRINTS
38 #ifdef DEBUG_PRINTS
39 #define debug_printk(x) printk x
40 #else
41 #define debug_printk(x)
42 #endif
43
44 #define OMAP_DMA_ACTIVE 0x01
45 #define OMAP_DMA_CCR_EN (1 << 7)
46 #define OMAP2_DMA_CSR_CLEAR_MASK 0xffe
47
48 #define OMAP_FUNC_MUX_ARM_BASE (0xfffe1000 + 0xec)
49
50 static int enable_1510_mode = 0;
51
52 struct omap_dma_lch {
53 int next_lch;
54 int dev_id;
55 u16 saved_csr;
56 u16 enabled_irqs;
57 const char *dev_name;
58 void (* callback)(int lch, u16 ch_status, void *data);
59 void *data;
60 long flags;
61 };
62
63 static int dma_chan_count;
64
65 static spinlock_t dma_chan_lock;
66 static struct omap_dma_lch dma_chan[OMAP_LOGICAL_DMA_CH_COUNT];
67
68 static const u8 omap1_dma_irq[OMAP_LOGICAL_DMA_CH_COUNT] = {
69 INT_DMA_CH0_6, INT_DMA_CH1_7, INT_DMA_CH2_8, INT_DMA_CH3,
70 INT_DMA_CH4, INT_DMA_CH5, INT_1610_DMA_CH6, INT_1610_DMA_CH7,
71 INT_1610_DMA_CH8, INT_1610_DMA_CH9, INT_1610_DMA_CH10,
72 INT_1610_DMA_CH11, INT_1610_DMA_CH12, INT_1610_DMA_CH13,
73 INT_1610_DMA_CH14, INT_1610_DMA_CH15, INT_DMA_LCD
74 };
75
76 #define REVISIT_24XX() printk(KERN_ERR "FIXME: no %s on 24xx\n", \
77 __FUNCTION__);
78
79 #ifdef CONFIG_ARCH_OMAP15XX
80 /* Returns 1 if the DMA module is in OMAP1510-compatible mode, 0 otherwise */
81 int omap_dma_in_1510_mode(void)
82 {
83 return enable_1510_mode;
84 }
85 #else
86 #define omap_dma_in_1510_mode() 0
87 #endif
88
89 #ifdef CONFIG_ARCH_OMAP1
90 static inline int get_gdma_dev(int req)
91 {
92 u32 reg = OMAP_FUNC_MUX_ARM_BASE + ((req - 1) / 5) * 4;
93 int shift = ((req - 1) % 5) * 6;
94
95 return ((omap_readl(reg) >> shift) & 0x3f) + 1;
96 }
97
98 static inline void set_gdma_dev(int req, int dev)
99 {
100 u32 reg = OMAP_FUNC_MUX_ARM_BASE + ((req - 1) / 5) * 4;
101 int shift = ((req - 1) % 5) * 6;
102 u32 l;
103
104 l = omap_readl(reg);
105 l &= ~(0x3f << shift);
106 l |= (dev - 1) << shift;
107 omap_writel(l, reg);
108 }
109 #else
110 #define set_gdma_dev(req, dev) do {} while (0)
111 #endif
112
113 static void clear_lch_regs(int lch)
114 {
115 int i;
116 u32 lch_base = OMAP_DMA_BASE + lch * 0x40;
117
118 for (i = 0; i < 0x2c; i += 2)
119 omap_writew(0, lch_base + i);
120 }
121
122 void omap_set_dma_priority(int lch, int dst_port, int priority)
123 {
124 unsigned long reg;
125 u32 l;
126
127 if (cpu_class_is_omap1()) {
128 switch (dst_port) {
129 case OMAP_DMA_PORT_OCP_T1: /* FFFECC00 */
130 reg = OMAP_TC_OCPT1_PRIOR;
131 break;
132 case OMAP_DMA_PORT_OCP_T2: /* FFFECCD0 */
133 reg = OMAP_TC_OCPT2_PRIOR;
134 break;
135 case OMAP_DMA_PORT_EMIFF: /* FFFECC08 */
136 reg = OMAP_TC_EMIFF_PRIOR;
137 break;
138 case OMAP_DMA_PORT_EMIFS: /* FFFECC04 */
139 reg = OMAP_TC_EMIFS_PRIOR;
140 break;
141 default:
142 BUG();
143 return;
144 }
145 l = omap_readl(reg);
146 l &= ~(0xf << 8);
147 l |= (priority & 0xf) << 8;
148 omap_writel(l, reg);
149 }
150
151 if (cpu_is_omap24xx()) {
152 if (priority)
153 OMAP_DMA_CCR_REG(lch) |= (1 << 6);
154 else
155 OMAP_DMA_CCR_REG(lch) &= ~(1 << 6);
156 }
157 }
158
159 void omap_set_dma_transfer_params(int lch, int data_type, int elem_count,
160 int frame_count, int sync_mode,
161 int dma_trigger, int src_or_dst_synch)
162 {
163 OMAP_DMA_CSDP_REG(lch) &= ~0x03;
164 OMAP_DMA_CSDP_REG(lch) |= data_type;
165
166 if (cpu_class_is_omap1()) {
167 OMAP_DMA_CCR_REG(lch) &= ~(1 << 5);
168 if (sync_mode == OMAP_DMA_SYNC_FRAME)
169 OMAP_DMA_CCR_REG(lch) |= 1 << 5;
170
171 OMAP1_DMA_CCR2_REG(lch) &= ~(1 << 2);
172 if (sync_mode == OMAP_DMA_SYNC_BLOCK)
173 OMAP1_DMA_CCR2_REG(lch) |= 1 << 2;
174 }
175
176 if (cpu_is_omap24xx() && dma_trigger) {
177 u32 val = OMAP_DMA_CCR_REG(lch);
178
179 val &= ~(3 << 19);
180 if (dma_trigger > 63)
181 val |= 1 << 20;
182 if (dma_trigger > 31)
183 val |= 1 << 19;
184
185 val &= ~(0x1f);
186 val |= (dma_trigger & 0x1f);
187
188 if (sync_mode & OMAP_DMA_SYNC_FRAME)
189 val |= 1 << 5;
190 else
191 val &= ~(1 << 5);
192
193 if (sync_mode & OMAP_DMA_SYNC_BLOCK)
194 val |= 1 << 18;
195 else
196 val &= ~(1 << 18);
197
198 if (src_or_dst_synch)
199 val |= 1 << 24; /* source synch */
200 else
201 val &= ~(1 << 24); /* dest synch */
202
203 OMAP_DMA_CCR_REG(lch) = val;
204 }
205
206 OMAP_DMA_CEN_REG(lch) = elem_count;
207 OMAP_DMA_CFN_REG(lch) = frame_count;
208 }
209
210 void omap_set_dma_color_mode(int lch, enum omap_dma_color_mode mode, u32 color)
211 {
212 u16 w;
213
214 BUG_ON(omap_dma_in_1510_mode());
215
216 if (cpu_is_omap24xx()) {
217 REVISIT_24XX();
218 return;
219 }
220
221 w = OMAP1_DMA_CCR2_REG(lch) & ~0x03;
222 switch (mode) {
223 case OMAP_DMA_CONSTANT_FILL:
224 w |= 0x01;
225 break;
226 case OMAP_DMA_TRANSPARENT_COPY:
227 w |= 0x02;
228 break;
229 case OMAP_DMA_COLOR_DIS:
230 break;
231 default:
232 BUG();
233 }
234 OMAP1_DMA_CCR2_REG(lch) = w;
235
236 w = OMAP1_DMA_LCH_CTRL_REG(lch) & ~0x0f;
237 /* Default is channel type 2D */
238 if (mode) {
239 OMAP1_DMA_COLOR_L_REG(lch) = (u16)color;
240 OMAP1_DMA_COLOR_U_REG(lch) = (u16)(color >> 16);
241 w |= 1; /* Channel type G */
242 }
243 OMAP1_DMA_LCH_CTRL_REG(lch) = w;
244 }
245
246 void omap_set_dma_write_mode(int lch, enum omap_dma_write_mode mode)
247 {
248 if (cpu_is_omap24xx()) {
249 OMAP_DMA_CSDP_REG(lch) &= ~(0x3 << 16);
250 OMAP_DMA_CSDP_REG(lch) |= (mode << 16);
251 }
252 }
253
254 /* Note that src_port is only for omap1 */
255 void omap_set_dma_src_params(int lch, int src_port, int src_amode,
256 unsigned long src_start,
257 int src_ei, int src_fi)
258 {
259 if (cpu_class_is_omap1()) {
260 OMAP_DMA_CSDP_REG(lch) &= ~(0x1f << 2);
261 OMAP_DMA_CSDP_REG(lch) |= src_port << 2;
262 }
263
264 OMAP_DMA_CCR_REG(lch) &= ~(0x03 << 12);
265 OMAP_DMA_CCR_REG(lch) |= src_amode << 12;
266
267 if (cpu_class_is_omap1()) {
268 OMAP1_DMA_CSSA_U_REG(lch) = src_start >> 16;
269 OMAP1_DMA_CSSA_L_REG(lch) = src_start;
270 }
271
272 if (cpu_is_omap24xx())
273 OMAP2_DMA_CSSA_REG(lch) = src_start;
274
275 OMAP_DMA_CSEI_REG(lch) = src_ei;
276 OMAP_DMA_CSFI_REG(lch) = src_fi;
277 }
278
279 void omap_set_dma_params(int lch, struct omap_dma_channel_params * params)
280 {
281 omap_set_dma_transfer_params(lch, params->data_type,
282 params->elem_count, params->frame_count,
283 params->sync_mode, params->trigger,
284 params->src_or_dst_synch);
285 omap_set_dma_src_params(lch, params->src_port,
286 params->src_amode, params->src_start,
287 params->src_ei, params->src_fi);
288
289 omap_set_dma_dest_params(lch, params->dst_port,
290 params->dst_amode, params->dst_start,
291 params->dst_ei, params->dst_fi);
292 }
293
294 void omap_set_dma_src_index(int lch, int eidx, int fidx)
295 {
296 if (cpu_is_omap24xx()) {
297 REVISIT_24XX();
298 return;
299 }
300 OMAP_DMA_CSEI_REG(lch) = eidx;
301 OMAP_DMA_CSFI_REG(lch) = fidx;
302 }
303
304 void omap_set_dma_src_data_pack(int lch, int enable)
305 {
306 OMAP_DMA_CSDP_REG(lch) &= ~(1 << 6);
307 if (enable)
308 OMAP_DMA_CSDP_REG(lch) |= (1 << 6);
309 }
310
311 void omap_set_dma_src_burst_mode(int lch, enum omap_dma_burst_mode burst_mode)
312 {
313 unsigned int burst = 0;
314 OMAP_DMA_CSDP_REG(lch) &= ~(0x03 << 7);
315
316 switch (burst_mode) {
317 case OMAP_DMA_DATA_BURST_DIS:
318 break;
319 case OMAP_DMA_DATA_BURST_4:
320 if (cpu_is_omap24xx())
321 burst = 0x1;
322 else
323 burst = 0x2;
324 break;
325 case OMAP_DMA_DATA_BURST_8:
326 if (cpu_is_omap24xx()) {
327 burst = 0x2;
328 break;
329 }
330 /* not supported by current hardware on OMAP1
331 * w |= (0x03 << 7);
332 * fall through
333 */
334 case OMAP_DMA_DATA_BURST_16:
335 if (cpu_is_omap24xx()) {
336 burst = 0x3;
337 break;
338 }
339 /* OMAP1 don't support burst 16
340 * fall through
341 */
342 default:
343 BUG();
344 }
345 OMAP_DMA_CSDP_REG(lch) |= (burst << 7);
346 }
347
348 /* Note that dest_port is only for OMAP1 */
349 void omap_set_dma_dest_params(int lch, int dest_port, int dest_amode,
350 unsigned long dest_start,
351 int dst_ei, int dst_fi)
352 {
353 if (cpu_class_is_omap1()) {
354 OMAP_DMA_CSDP_REG(lch) &= ~(0x1f << 9);
355 OMAP_DMA_CSDP_REG(lch) |= dest_port << 9;
356 }
357
358 OMAP_DMA_CCR_REG(lch) &= ~(0x03 << 14);
359 OMAP_DMA_CCR_REG(lch) |= dest_amode << 14;
360
361 if (cpu_class_is_omap1()) {
362 OMAP1_DMA_CDSA_U_REG(lch) = dest_start >> 16;
363 OMAP1_DMA_CDSA_L_REG(lch) = dest_start;
364 }
365
366 if (cpu_is_omap24xx())
367 OMAP2_DMA_CDSA_REG(lch) = dest_start;
368
369 OMAP_DMA_CDEI_REG(lch) = dst_ei;
370 OMAP_DMA_CDFI_REG(lch) = dst_fi;
371 }
372
373 void omap_set_dma_dest_index(int lch, int eidx, int fidx)
374 {
375 if (cpu_is_omap24xx()) {
376 REVISIT_24XX();
377 return;
378 }
379 OMAP_DMA_CDEI_REG(lch) = eidx;
380 OMAP_DMA_CDFI_REG(lch) = fidx;
381 }
382
383 void omap_set_dma_dest_data_pack(int lch, int enable)
384 {
385 OMAP_DMA_CSDP_REG(lch) &= ~(1 << 13);
386 if (enable)
387 OMAP_DMA_CSDP_REG(lch) |= 1 << 13;
388 }
389
390 void omap_set_dma_dest_burst_mode(int lch, enum omap_dma_burst_mode burst_mode)
391 {
392 unsigned int burst = 0;
393 OMAP_DMA_CSDP_REG(lch) &= ~(0x03 << 14);
394
395 switch (burst_mode) {
396 case OMAP_DMA_DATA_BURST_DIS:
397 break;
398 case OMAP_DMA_DATA_BURST_4:
399 if (cpu_is_omap24xx())
400 burst = 0x1;
401 else
402 burst = 0x2;
403 break;
404 case OMAP_DMA_DATA_BURST_8:
405 if (cpu_is_omap24xx())
406 burst = 0x2;
407 else
408 burst = 0x3;
409 break;
410 case OMAP_DMA_DATA_BURST_16:
411 if (cpu_is_omap24xx()) {
412 burst = 0x3;
413 break;
414 }
415 /* OMAP1 don't support burst 16
416 * fall through
417 */
418 default:
419 printk(KERN_ERR "Invalid DMA burst mode\n");
420 BUG();
421 return;
422 }
423 OMAP_DMA_CSDP_REG(lch) |= (burst << 14);
424 }
425
426 static inline void omap_enable_channel_irq(int lch)
427 {
428 u32 status;
429
430 /* Clear CSR */
431 if (cpu_class_is_omap1())
432 status = OMAP_DMA_CSR_REG(lch);
433 else if (cpu_is_omap24xx())
434 OMAP_DMA_CSR_REG(lch) = OMAP2_DMA_CSR_CLEAR_MASK;
435
436 /* Enable some nice interrupts. */
437 OMAP_DMA_CICR_REG(lch) = dma_chan[lch].enabled_irqs;
438
439 dma_chan[lch].flags |= OMAP_DMA_ACTIVE;
440 }
441
442 static void omap_disable_channel_irq(int lch)
443 {
444 if (cpu_is_omap24xx())
445 OMAP_DMA_CICR_REG(lch) = 0;
446 }
447
448 void omap_enable_dma_irq(int lch, u16 bits)
449 {
450 dma_chan[lch].enabled_irqs |= bits;
451 }
452
453 void omap_disable_dma_irq(int lch, u16 bits)
454 {
455 dma_chan[lch].enabled_irqs &= ~bits;
456 }
457
458 static inline void enable_lnk(int lch)
459 {
460 if (cpu_class_is_omap1())
461 OMAP_DMA_CLNK_CTRL_REG(lch) &= ~(1 << 14);
462
463 /* Set the ENABLE_LNK bits */
464 if (dma_chan[lch].next_lch != -1)
465 OMAP_DMA_CLNK_CTRL_REG(lch) =
466 dma_chan[lch].next_lch | (1 << 15);
467 }
468
469 static inline void disable_lnk(int lch)
470 {
471 /* Disable interrupts */
472 if (cpu_class_is_omap1()) {
473 OMAP_DMA_CICR_REG(lch) = 0;
474 /* Set the STOP_LNK bit */
475 OMAP_DMA_CLNK_CTRL_REG(lch) |= 1 << 14;
476 }
477
478 if (cpu_is_omap24xx()) {
479 omap_disable_channel_irq(lch);
480 /* Clear the ENABLE_LNK bit */
481 OMAP_DMA_CLNK_CTRL_REG(lch) &= ~(1 << 15);
482 }
483
484 dma_chan[lch].flags &= ~OMAP_DMA_ACTIVE;
485 }
486
487 static inline void omap2_enable_irq_lch(int lch)
488 {
489 u32 val;
490
491 if (!cpu_is_omap24xx())
492 return;
493
494 val = omap_readl(OMAP_DMA4_IRQENABLE_L0);
495 val |= 1 << lch;
496 omap_writel(val, OMAP_DMA4_IRQENABLE_L0);
497 }
498
499 int omap_request_dma(int dev_id, const char *dev_name,
500 void (* callback)(int lch, u16 ch_status, void *data),
501 void *data, int *dma_ch_out)
502 {
503 int ch, free_ch = -1;
504 unsigned long flags;
505 struct omap_dma_lch *chan;
506
507 spin_lock_irqsave(&dma_chan_lock, flags);
508 for (ch = 0; ch < dma_chan_count; ch++) {
509 if (free_ch == -1 && dma_chan[ch].dev_id == -1) {
510 free_ch = ch;
511 if (dev_id == 0)
512 break;
513 }
514 }
515 if (free_ch == -1) {
516 spin_unlock_irqrestore(&dma_chan_lock, flags);
517 return -EBUSY;
518 }
519 chan = dma_chan + free_ch;
520 chan->dev_id = dev_id;
521
522 if (cpu_class_is_omap1())
523 clear_lch_regs(free_ch);
524
525 if (cpu_is_omap24xx())
526 omap_clear_dma(free_ch);
527
528 spin_unlock_irqrestore(&dma_chan_lock, flags);
529
530 chan->dev_name = dev_name;
531 chan->callback = callback;
532 chan->data = data;
533 chan->enabled_irqs = OMAP_DMA_DROP_IRQ | OMAP_DMA_BLOCK_IRQ;
534
535 if (cpu_class_is_omap1())
536 chan->enabled_irqs |= OMAP1_DMA_TOUT_IRQ;
537 else if (cpu_is_omap24xx())
538 chan->enabled_irqs |= OMAP2_DMA_MISALIGNED_ERR_IRQ |
539 OMAP2_DMA_TRANS_ERR_IRQ;
540
541 if (cpu_is_omap16xx()) {
542 /* If the sync device is set, configure it dynamically. */
543 if (dev_id != 0) {
544 set_gdma_dev(free_ch + 1, dev_id);
545 dev_id = free_ch + 1;
546 }
547 /* Disable the 1510 compatibility mode and set the sync device
548 * id. */
549 OMAP_DMA_CCR_REG(free_ch) = dev_id | (1 << 10);
550 } else if (cpu_is_omap730() || cpu_is_omap15xx()) {
551 OMAP_DMA_CCR_REG(free_ch) = dev_id;
552 }
553
554 if (cpu_is_omap24xx()) {
555 omap2_enable_irq_lch(free_ch);
556
557 omap_enable_channel_irq(free_ch);
558 /* Clear the CSR register and IRQ status register */
559 OMAP_DMA_CSR_REG(free_ch) = OMAP2_DMA_CSR_CLEAR_MASK;
560 omap_writel(1 << free_ch, OMAP_DMA4_IRQSTATUS_L0);
561 }
562
563 *dma_ch_out = free_ch;
564
565 return 0;
566 }
567
568 void omap_free_dma(int lch)
569 {
570 unsigned long flags;
571
572 spin_lock_irqsave(&dma_chan_lock, flags);
573 if (dma_chan[lch].dev_id == -1) {
574 printk("omap_dma: trying to free nonallocated DMA channel %d\n",
575 lch);
576 spin_unlock_irqrestore(&dma_chan_lock, flags);
577 return;
578 }
579 dma_chan[lch].dev_id = -1;
580 dma_chan[lch].next_lch = -1;
581 dma_chan[lch].callback = NULL;
582 spin_unlock_irqrestore(&dma_chan_lock, flags);
583
584 if (cpu_class_is_omap1()) {
585 /* Disable all DMA interrupts for the channel. */
586 OMAP_DMA_CICR_REG(lch) = 0;
587 /* Make sure the DMA transfer is stopped. */
588 OMAP_DMA_CCR_REG(lch) = 0;
589 }
590
591 if (cpu_is_omap24xx()) {
592 u32 val;
593 /* Disable interrupts */
594 val = omap_readl(OMAP_DMA4_IRQENABLE_L0);
595 val &= ~(1 << lch);
596 omap_writel(val, OMAP_DMA4_IRQENABLE_L0);
597
598 /* Clear the CSR register and IRQ status register */
599 OMAP_DMA_CSR_REG(lch) = OMAP2_DMA_CSR_CLEAR_MASK;
600 omap_writel(1 << lch, OMAP_DMA4_IRQSTATUS_L0);
601
602 /* Disable all DMA interrupts for the channel. */
603 OMAP_DMA_CICR_REG(lch) = 0;
604
605 /* Make sure the DMA transfer is stopped. */
606 OMAP_DMA_CCR_REG(lch) = 0;
607 omap_clear_dma(lch);
608 }
609 }
610
611 /*
612 * Clears any DMA state so the DMA engine is ready to restart with new buffers
613 * through omap_start_dma(). Any buffers in flight are discarded.
614 */
615 void omap_clear_dma(int lch)
616 {
617 unsigned long flags;
618
619 local_irq_save(flags);
620
621 if (cpu_class_is_omap1()) {
622 int status;
623 OMAP_DMA_CCR_REG(lch) &= ~OMAP_DMA_CCR_EN;
624
625 /* Clear pending interrupts */
626 status = OMAP_DMA_CSR_REG(lch);
627 }
628
629 if (cpu_is_omap24xx()) {
630 int i;
631 u32 lch_base = OMAP24XX_DMA_BASE + lch * 0x60 + 0x80;
632 for (i = 0; i < 0x44; i += 4)
633 omap_writel(0, lch_base + i);
634 }
635
636 local_irq_restore(flags);
637 }
638
639 void omap_start_dma(int lch)
640 {
641 if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) {
642 int next_lch, cur_lch;
643 char dma_chan_link_map[OMAP_LOGICAL_DMA_CH_COUNT];
644
645 dma_chan_link_map[lch] = 1;
646 /* Set the link register of the first channel */
647 enable_lnk(lch);
648
649 memset(dma_chan_link_map, 0, sizeof(dma_chan_link_map));
650 cur_lch = dma_chan[lch].next_lch;
651 do {
652 next_lch = dma_chan[cur_lch].next_lch;
653
654 /* The loop case: we've been here already */
655 if (dma_chan_link_map[cur_lch])
656 break;
657 /* Mark the current channel */
658 dma_chan_link_map[cur_lch] = 1;
659
660 enable_lnk(cur_lch);
661 omap_enable_channel_irq(cur_lch);
662
663 cur_lch = next_lch;
664 } while (next_lch != -1);
665 } else if (cpu_is_omap24xx()) {
666 /* Errata: Need to write lch even if not using chaining */
667 OMAP_DMA_CLNK_CTRL_REG(lch) = lch;
668 }
669
670 omap_enable_channel_irq(lch);
671
672 /* Errata: On ES2.0 BUFFERING disable must be set.
673 * This will always fail on ES1.0 */
674 if (cpu_is_omap24xx()) {
675 OMAP_DMA_CCR_REG(lch) |= OMAP_DMA_CCR_EN;
676 }
677
678 OMAP_DMA_CCR_REG(lch) |= OMAP_DMA_CCR_EN;
679
680 dma_chan[lch].flags |= OMAP_DMA_ACTIVE;
681 }
682
683 void omap_stop_dma(int lch)
684 {
685 if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) {
686 int next_lch, cur_lch = lch;
687 char dma_chan_link_map[OMAP_LOGICAL_DMA_CH_COUNT];
688
689 memset(dma_chan_link_map, 0, sizeof(dma_chan_link_map));
690 do {
691 /* The loop case: we've been here already */
692 if (dma_chan_link_map[cur_lch])
693 break;
694 /* Mark the current channel */
695 dma_chan_link_map[cur_lch] = 1;
696
697 disable_lnk(cur_lch);
698
699 next_lch = dma_chan[cur_lch].next_lch;
700 cur_lch = next_lch;
701 } while (next_lch != -1);
702
703 return;
704 }
705
706 /* Disable all interrupts on the channel */
707 if (cpu_class_is_omap1())
708 OMAP_DMA_CICR_REG(lch) = 0;
709
710 OMAP_DMA_CCR_REG(lch) &= ~OMAP_DMA_CCR_EN;
711 dma_chan[lch].flags &= ~OMAP_DMA_ACTIVE;
712 }
713
714 /*
715 * Allows changing the DMA callback function or data. This may be needed if
716 * the driver shares a single DMA channel for multiple dma triggers.
717 */
718 int omap_set_dma_callback(int lch,
719 void (* callback)(int lch, u16 ch_status, void *data),
720 void *data)
721 {
722 unsigned long flags;
723
724 if (lch < 0)
725 return -ENODEV;
726
727 spin_lock_irqsave(&dma_chan_lock, flags);
728 if (dma_chan[lch].dev_id == -1) {
729 printk(KERN_ERR "DMA callback for not set for free channel\n");
730 spin_unlock_irqrestore(&dma_chan_lock, flags);
731 return -EINVAL;
732 }
733 dma_chan[lch].callback = callback;
734 dma_chan[lch].data = data;
735 spin_unlock_irqrestore(&dma_chan_lock, flags);
736
737 return 0;
738 }
739
740 /*
741 * Returns current physical source address for the given DMA channel.
742 * If the channel is running the caller must disable interrupts prior calling
743 * this function and process the returned value before re-enabling interrupt to
744 * prevent races with the interrupt handler. Note that in continuous mode there
745 * is a chance for CSSA_L register overflow inbetween the two reads resulting
746 * in incorrect return value.
747 */
748 dma_addr_t omap_get_dma_src_pos(int lch)
749 {
750 dma_addr_t offset = 0;
751
752 if (cpu_class_is_omap1())
753 offset = (dma_addr_t) (OMAP1_DMA_CSSA_L_REG(lch) |
754 (OMAP1_DMA_CSSA_U_REG(lch) << 16));
755
756 if (cpu_is_omap24xx())
757 offset = OMAP_DMA_CSAC_REG(lch);
758
759 return offset;
760 }
761
762 /*
763 * Returns current physical destination address for the given DMA channel.
764 * If the channel is running the caller must disable interrupts prior calling
765 * this function and process the returned value before re-enabling interrupt to
766 * prevent races with the interrupt handler. Note that in continuous mode there
767 * is a chance for CDSA_L register overflow inbetween the two reads resulting
768 * in incorrect return value.
769 */
770 dma_addr_t omap_get_dma_dst_pos(int lch)
771 {
772 dma_addr_t offset = 0;
773
774 if (cpu_class_is_omap1())
775 offset = (dma_addr_t) (OMAP1_DMA_CDSA_L_REG(lch) |
776 (OMAP1_DMA_CDSA_U_REG(lch) << 16));
777
778 if (cpu_is_omap24xx())
779 offset = OMAP2_DMA_CDSA_REG(lch);
780
781 return offset;
782 }
783
784 /*
785 * Returns current source transfer counting for the given DMA channel.
786 * Can be used to monitor the progress of a transfer inside a block.
787 * It must be called with disabled interrupts.
788 */
789 int omap_get_dma_src_addr_counter(int lch)
790 {
791 return (dma_addr_t) OMAP_DMA_CSAC_REG(lch);
792 }
793
794 int omap_dma_running(void)
795 {
796 int lch;
797
798 /* Check if LCD DMA is running */
799 if (cpu_is_omap16xx())
800 if (omap_readw(OMAP1610_DMA_LCD_CCR) & OMAP_DMA_CCR_EN)
801 return 1;
802
803 for (lch = 0; lch < dma_chan_count; lch++)
804 if (OMAP_DMA_CCR_REG(lch) & OMAP_DMA_CCR_EN)
805 return 1;
806
807 return 0;
808 }
809
810 /*
811 * lch_queue DMA will start right after lch_head one is finished.
812 * For this DMA link to start, you still need to start (see omap_start_dma)
813 * the first one. That will fire up the entire queue.
814 */
815 void omap_dma_link_lch (int lch_head, int lch_queue)
816 {
817 if (omap_dma_in_1510_mode()) {
818 printk(KERN_ERR "DMA linking is not supported in 1510 mode\n");
819 BUG();
820 return;
821 }
822
823 if ((dma_chan[lch_head].dev_id == -1) ||
824 (dma_chan[lch_queue].dev_id == -1)) {
825 printk(KERN_ERR "omap_dma: trying to link "
826 "non requested channels\n");
827 dump_stack();
828 }
829
830 dma_chan[lch_head].next_lch = lch_queue;
831 }
832
833 /*
834 * Once the DMA queue is stopped, we can destroy it.
835 */
836 void omap_dma_unlink_lch (int lch_head, int lch_queue)
837 {
838 if (omap_dma_in_1510_mode()) {
839 printk(KERN_ERR "DMA linking is not supported in 1510 mode\n");
840 BUG();
841 return;
842 }
843
844 if (dma_chan[lch_head].next_lch != lch_queue ||
845 dma_chan[lch_head].next_lch == -1) {
846 printk(KERN_ERR "omap_dma: trying to unlink "
847 "non linked channels\n");
848 dump_stack();
849 }
850
851
852 if ((dma_chan[lch_head].flags & OMAP_DMA_ACTIVE) ||
853 (dma_chan[lch_head].flags & OMAP_DMA_ACTIVE)) {
854 printk(KERN_ERR "omap_dma: You need to stop the DMA channels "
855 "before unlinking\n");
856 dump_stack();
857 }
858
859 dma_chan[lch_head].next_lch = -1;
860 }
861
862 /*----------------------------------------------------------------------------*/
863
864 #ifdef CONFIG_ARCH_OMAP1
865
866 static int omap1_dma_handle_ch(int ch)
867 {
868 u16 csr;
869
870 if (enable_1510_mode && ch >= 6) {
871 csr = dma_chan[ch].saved_csr;
872 dma_chan[ch].saved_csr = 0;
873 } else
874 csr = OMAP_DMA_CSR_REG(ch);
875 if (enable_1510_mode && ch <= 2 && (csr >> 7) != 0) {
876 dma_chan[ch + 6].saved_csr = csr >> 7;
877 csr &= 0x7f;
878 }
879 if ((csr & 0x3f) == 0)
880 return 0;
881 if (unlikely(dma_chan[ch].dev_id == -1)) {
882 printk(KERN_WARNING "Spurious interrupt from DMA channel "
883 "%d (CSR %04x)\n", ch, csr);
884 return 0;
885 }
886 if (unlikely(csr & OMAP1_DMA_TOUT_IRQ))
887 printk(KERN_WARNING "DMA timeout with device %d\n",
888 dma_chan[ch].dev_id);
889 if (unlikely(csr & OMAP_DMA_DROP_IRQ))
890 printk(KERN_WARNING "DMA synchronization event drop occurred "
891 "with device %d\n", dma_chan[ch].dev_id);
892 if (likely(csr & OMAP_DMA_BLOCK_IRQ))
893 dma_chan[ch].flags &= ~OMAP_DMA_ACTIVE;
894 if (likely(dma_chan[ch].callback != NULL))
895 dma_chan[ch].callback(ch, csr, dma_chan[ch].data);
896 return 1;
897 }
898
899 static irqreturn_t omap1_dma_irq_handler(int irq, void *dev_id)
900 {
901 int ch = ((int) dev_id) - 1;
902 int handled = 0;
903
904 for (;;) {
905 int handled_now = 0;
906
907 handled_now += omap1_dma_handle_ch(ch);
908 if (enable_1510_mode && dma_chan[ch + 6].saved_csr)
909 handled_now += omap1_dma_handle_ch(ch + 6);
910 if (!handled_now)
911 break;
912 handled += handled_now;
913 }
914
915 return handled ? IRQ_HANDLED : IRQ_NONE;
916 }
917
918 #else
919 #define omap1_dma_irq_handler NULL
920 #endif
921
922 #ifdef CONFIG_ARCH_OMAP2
923
924 static int omap2_dma_handle_ch(int ch)
925 {
926 u32 status = OMAP_DMA_CSR_REG(ch);
927
928 if (!status) {
929 if (printk_ratelimit())
930 printk(KERN_WARNING "Spurious DMA IRQ for lch %d\n", ch);
931 return 0;
932 }
933 if (unlikely(dma_chan[ch].dev_id == -1)) {
934 if (printk_ratelimit())
935 printk(KERN_WARNING "IRQ %04x for non-allocated DMA"
936 "channel %d\n", status, ch);
937 return 0;
938 }
939 if (unlikely(status & OMAP_DMA_DROP_IRQ))
940 printk(KERN_INFO
941 "DMA synchronization event drop occurred with device "
942 "%d\n", dma_chan[ch].dev_id);
943 if (unlikely(status & OMAP2_DMA_TRANS_ERR_IRQ))
944 printk(KERN_INFO "DMA transaction error with device %d\n",
945 dma_chan[ch].dev_id);
946 if (unlikely(status & OMAP2_DMA_SECURE_ERR_IRQ))
947 printk(KERN_INFO "DMA secure error with device %d\n",
948 dma_chan[ch].dev_id);
949 if (unlikely(status & OMAP2_DMA_MISALIGNED_ERR_IRQ))
950 printk(KERN_INFO "DMA misaligned error with device %d\n",
951 dma_chan[ch].dev_id);
952
953 OMAP_DMA_CSR_REG(ch) = OMAP2_DMA_CSR_CLEAR_MASK;
954 omap_writel(1 << ch, OMAP_DMA4_IRQSTATUS_L0);
955
956 if (likely(dma_chan[ch].callback != NULL))
957 dma_chan[ch].callback(ch, status, dma_chan[ch].data);
958
959 return 0;
960 }
961
962 /* STATUS register count is from 1-32 while our is 0-31 */
963 static irqreturn_t omap2_dma_irq_handler(int irq, void *dev_id)
964 {
965 u32 val;
966 int i;
967
968 val = omap_readl(OMAP_DMA4_IRQSTATUS_L0);
969 if (val == 0) {
970 if (printk_ratelimit())
971 printk(KERN_WARNING "Spurious DMA IRQ\n");
972 return IRQ_HANDLED;
973 }
974 for (i = 0; i < OMAP_LOGICAL_DMA_CH_COUNT && val != 0; i++) {
975 if (val & 1)
976 omap2_dma_handle_ch(i);
977 val >>= 1;
978 }
979
980 return IRQ_HANDLED;
981 }
982
983 static struct irqaction omap24xx_dma_irq = {
984 .name = "DMA",
985 .handler = omap2_dma_irq_handler,
986 .flags = IRQF_DISABLED
987 };
988
989 #else
990 static struct irqaction omap24xx_dma_irq;
991 #endif
992
993 /*----------------------------------------------------------------------------*/
994
995 static struct lcd_dma_info {
996 spinlock_t lock;
997 int reserved;
998 void (* callback)(u16 status, void *data);
999 void *cb_data;
1000
1001 int active;
1002 unsigned long addr, size;
1003 int rotate, data_type, xres, yres;
1004 int vxres;
1005 int mirror;
1006 int xscale, yscale;
1007 int ext_ctrl;
1008 int src_port;
1009 int single_transfer;
1010 } lcd_dma;
1011
1012 void omap_set_lcd_dma_b1(unsigned long addr, u16 fb_xres, u16 fb_yres,
1013 int data_type)
1014 {
1015 lcd_dma.addr = addr;
1016 lcd_dma.data_type = data_type;
1017 lcd_dma.xres = fb_xres;
1018 lcd_dma.yres = fb_yres;
1019 }
1020
1021 void omap_set_lcd_dma_src_port(int port)
1022 {
1023 lcd_dma.src_port = port;
1024 }
1025
1026 void omap_set_lcd_dma_ext_controller(int external)
1027 {
1028 lcd_dma.ext_ctrl = external;
1029 }
1030
1031 void omap_set_lcd_dma_single_transfer(int single)
1032 {
1033 lcd_dma.single_transfer = single;
1034 }
1035
1036
1037 void omap_set_lcd_dma_b1_rotation(int rotate)
1038 {
1039 if (omap_dma_in_1510_mode()) {
1040 printk(KERN_ERR "DMA rotation is not supported in 1510 mode\n");
1041 BUG();
1042 return;
1043 }
1044 lcd_dma.rotate = rotate;
1045 }
1046
1047 void omap_set_lcd_dma_b1_mirror(int mirror)
1048 {
1049 if (omap_dma_in_1510_mode()) {
1050 printk(KERN_ERR "DMA mirror is not supported in 1510 mode\n");
1051 BUG();
1052 }
1053 lcd_dma.mirror = mirror;
1054 }
1055
1056 void omap_set_lcd_dma_b1_vxres(unsigned long vxres)
1057 {
1058 if (omap_dma_in_1510_mode()) {
1059 printk(KERN_ERR "DMA virtual resulotion is not supported "
1060 "in 1510 mode\n");
1061 BUG();
1062 }
1063 lcd_dma.vxres = vxres;
1064 }
1065
1066 void omap_set_lcd_dma_b1_scale(unsigned int xscale, unsigned int yscale)
1067 {
1068 if (omap_dma_in_1510_mode()) {
1069 printk(KERN_ERR "DMA scale is not supported in 1510 mode\n");
1070 BUG();
1071 }
1072 lcd_dma.xscale = xscale;
1073 lcd_dma.yscale = yscale;
1074 }
1075
1076 static void set_b1_regs(void)
1077 {
1078 unsigned long top, bottom;
1079 int es;
1080 u16 w;
1081 unsigned long en, fn;
1082 long ei, fi;
1083 unsigned long vxres;
1084 unsigned int xscale, yscale;
1085
1086 switch (lcd_dma.data_type) {
1087 case OMAP_DMA_DATA_TYPE_S8:
1088 es = 1;
1089 break;
1090 case OMAP_DMA_DATA_TYPE_S16:
1091 es = 2;
1092 break;
1093 case OMAP_DMA_DATA_TYPE_S32:
1094 es = 4;
1095 break;
1096 default:
1097 BUG();
1098 return;
1099 }
1100
1101 vxres = lcd_dma.vxres ? lcd_dma.vxres : lcd_dma.xres;
1102 xscale = lcd_dma.xscale ? lcd_dma.xscale : 1;
1103 yscale = lcd_dma.yscale ? lcd_dma.yscale : 1;
1104 BUG_ON(vxres < lcd_dma.xres);
1105 #define PIXADDR(x,y) (lcd_dma.addr + ((y) * vxres * yscale + (x) * xscale) * es)
1106 #define PIXSTEP(sx, sy, dx, dy) (PIXADDR(dx, dy) - PIXADDR(sx, sy) - es + 1)
1107 switch (lcd_dma.rotate) {
1108 case 0:
1109 if (!lcd_dma.mirror) {
1110 top = PIXADDR(0, 0);
1111 bottom = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
1112 /* 1510 DMA requires the bottom address to be 2 more
1113 * than the actual last memory access location. */
1114 if (omap_dma_in_1510_mode() &&
1115 lcd_dma.data_type == OMAP_DMA_DATA_TYPE_S32)
1116 bottom += 2;
1117 ei = PIXSTEP(0, 0, 1, 0);
1118 fi = PIXSTEP(lcd_dma.xres - 1, 0, 0, 1);
1119 } else {
1120 top = PIXADDR(lcd_dma.xres - 1, 0);
1121 bottom = PIXADDR(0, lcd_dma.yres - 1);
1122 ei = PIXSTEP(1, 0, 0, 0);
1123 fi = PIXSTEP(0, 0, lcd_dma.xres - 1, 1);
1124 }
1125 en = lcd_dma.xres;
1126 fn = lcd_dma.yres;
1127 break;
1128 case 90:
1129 if (!lcd_dma.mirror) {
1130 top = PIXADDR(0, lcd_dma.yres - 1);
1131 bottom = PIXADDR(lcd_dma.xres - 1, 0);
1132 ei = PIXSTEP(0, 1, 0, 0);
1133 fi = PIXSTEP(0, 0, 1, lcd_dma.yres - 1);
1134 } else {
1135 top = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
1136 bottom = PIXADDR(0, 0);
1137 ei = PIXSTEP(0, 1, 0, 0);
1138 fi = PIXSTEP(1, 0, 0, lcd_dma.yres - 1);
1139 }
1140 en = lcd_dma.yres;
1141 fn = lcd_dma.xres;
1142 break;
1143 case 180:
1144 if (!lcd_dma.mirror) {
1145 top = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
1146 bottom = PIXADDR(0, 0);
1147 ei = PIXSTEP(1, 0, 0, 0);
1148 fi = PIXSTEP(0, 1, lcd_dma.xres - 1, 0);
1149 } else {
1150 top = PIXADDR(0, lcd_dma.yres - 1);
1151 bottom = PIXADDR(lcd_dma.xres - 1, 0);
1152 ei = PIXSTEP(0, 0, 1, 0);
1153 fi = PIXSTEP(lcd_dma.xres - 1, 1, 0, 0);
1154 }
1155 en = lcd_dma.xres;
1156 fn = lcd_dma.yres;
1157 break;
1158 case 270:
1159 if (!lcd_dma.mirror) {
1160 top = PIXADDR(lcd_dma.xres - 1, 0);
1161 bottom = PIXADDR(0, lcd_dma.yres - 1);
1162 ei = PIXSTEP(0, 0, 0, 1);
1163 fi = PIXSTEP(1, lcd_dma.yres - 1, 0, 0);
1164 } else {
1165 top = PIXADDR(0, 0);
1166 bottom = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
1167 ei = PIXSTEP(0, 0, 0, 1);
1168 fi = PIXSTEP(0, lcd_dma.yres - 1, 1, 0);
1169 }
1170 en = lcd_dma.yres;
1171 fn = lcd_dma.xres;
1172 break;
1173 default:
1174 BUG();
1175 return; /* Suppress warning about uninitialized vars */
1176 }
1177
1178 if (omap_dma_in_1510_mode()) {
1179 omap_writew(top >> 16, OMAP1510_DMA_LCD_TOP_F1_U);
1180 omap_writew(top, OMAP1510_DMA_LCD_TOP_F1_L);
1181 omap_writew(bottom >> 16, OMAP1510_DMA_LCD_BOT_F1_U);
1182 omap_writew(bottom, OMAP1510_DMA_LCD_BOT_F1_L);
1183
1184 return;
1185 }
1186
1187 /* 1610 regs */
1188 omap_writew(top >> 16, OMAP1610_DMA_LCD_TOP_B1_U);
1189 omap_writew(top, OMAP1610_DMA_LCD_TOP_B1_L);
1190 omap_writew(bottom >> 16, OMAP1610_DMA_LCD_BOT_B1_U);
1191 omap_writew(bottom, OMAP1610_DMA_LCD_BOT_B1_L);
1192
1193 omap_writew(en, OMAP1610_DMA_LCD_SRC_EN_B1);
1194 omap_writew(fn, OMAP1610_DMA_LCD_SRC_FN_B1);
1195
1196 w = omap_readw(OMAP1610_DMA_LCD_CSDP);
1197 w &= ~0x03;
1198 w |= lcd_dma.data_type;
1199 omap_writew(w, OMAP1610_DMA_LCD_CSDP);
1200
1201 w = omap_readw(OMAP1610_DMA_LCD_CTRL);
1202 /* Always set the source port as SDRAM for now*/
1203 w &= ~(0x03 << 6);
1204 if (lcd_dma.callback != NULL)
1205 w |= 1 << 1; /* Block interrupt enable */
1206 else
1207 w &= ~(1 << 1);
1208 omap_writew(w, OMAP1610_DMA_LCD_CTRL);
1209
1210 if (!(lcd_dma.rotate || lcd_dma.mirror ||
1211 lcd_dma.vxres || lcd_dma.xscale || lcd_dma.yscale))
1212 return;
1213
1214 w = omap_readw(OMAP1610_DMA_LCD_CCR);
1215 /* Set the double-indexed addressing mode */
1216 w |= (0x03 << 12);
1217 omap_writew(w, OMAP1610_DMA_LCD_CCR);
1218
1219 omap_writew(ei, OMAP1610_DMA_LCD_SRC_EI_B1);
1220 omap_writew(fi >> 16, OMAP1610_DMA_LCD_SRC_FI_B1_U);
1221 omap_writew(fi, OMAP1610_DMA_LCD_SRC_FI_B1_L);
1222 }
1223
1224 static irqreturn_t lcd_dma_irq_handler(int irq, void *dev_id)
1225 {
1226 u16 w;
1227
1228 w = omap_readw(OMAP1610_DMA_LCD_CTRL);
1229 if (unlikely(!(w & (1 << 3)))) {
1230 printk(KERN_WARNING "Spurious LCD DMA IRQ\n");
1231 return IRQ_NONE;
1232 }
1233 /* Ack the IRQ */
1234 w |= (1 << 3);
1235 omap_writew(w, OMAP1610_DMA_LCD_CTRL);
1236 lcd_dma.active = 0;
1237 if (lcd_dma.callback != NULL)
1238 lcd_dma.callback(w, lcd_dma.cb_data);
1239
1240 return IRQ_HANDLED;
1241 }
1242
1243 int omap_request_lcd_dma(void (* callback)(u16 status, void *data),
1244 void *data)
1245 {
1246 spin_lock_irq(&lcd_dma.lock);
1247 if (lcd_dma.reserved) {
1248 spin_unlock_irq(&lcd_dma.lock);
1249 printk(KERN_ERR "LCD DMA channel already reserved\n");
1250 BUG();
1251 return -EBUSY;
1252 }
1253 lcd_dma.reserved = 1;
1254 spin_unlock_irq(&lcd_dma.lock);
1255 lcd_dma.callback = callback;
1256 lcd_dma.cb_data = data;
1257 lcd_dma.active = 0;
1258 lcd_dma.single_transfer = 0;
1259 lcd_dma.rotate = 0;
1260 lcd_dma.vxres = 0;
1261 lcd_dma.mirror = 0;
1262 lcd_dma.xscale = 0;
1263 lcd_dma.yscale = 0;
1264 lcd_dma.ext_ctrl = 0;
1265 lcd_dma.src_port = 0;
1266
1267 return 0;
1268 }
1269
1270 void omap_free_lcd_dma(void)
1271 {
1272 spin_lock(&lcd_dma.lock);
1273 if (!lcd_dma.reserved) {
1274 spin_unlock(&lcd_dma.lock);
1275 printk(KERN_ERR "LCD DMA is not reserved\n");
1276 BUG();
1277 return;
1278 }
1279 if (!enable_1510_mode)
1280 omap_writew(omap_readw(OMAP1610_DMA_LCD_CCR) & ~1,
1281 OMAP1610_DMA_LCD_CCR);
1282 lcd_dma.reserved = 0;
1283 spin_unlock(&lcd_dma.lock);
1284 }
1285
1286 void omap_enable_lcd_dma(void)
1287 {
1288 u16 w;
1289
1290 /* Set the Enable bit only if an external controller is
1291 * connected. Otherwise the OMAP internal controller will
1292 * start the transfer when it gets enabled.
1293 */
1294 if (enable_1510_mode || !lcd_dma.ext_ctrl)
1295 return;
1296
1297 w = omap_readw(OMAP1610_DMA_LCD_CTRL);
1298 w |= 1 << 8;
1299 omap_writew(w, OMAP1610_DMA_LCD_CTRL);
1300
1301 lcd_dma.active = 1;
1302
1303 w = omap_readw(OMAP1610_DMA_LCD_CCR);
1304 w |= 1 << 7;
1305 omap_writew(w, OMAP1610_DMA_LCD_CCR);
1306 }
1307
1308 void omap_setup_lcd_dma(void)
1309 {
1310 BUG_ON(lcd_dma.active);
1311 if (!enable_1510_mode) {
1312 /* Set some reasonable defaults */
1313 omap_writew(0x5440, OMAP1610_DMA_LCD_CCR);
1314 omap_writew(0x9102, OMAP1610_DMA_LCD_CSDP);
1315 omap_writew(0x0004, OMAP1610_DMA_LCD_LCH_CTRL);
1316 }
1317 set_b1_regs();
1318 if (!enable_1510_mode) {
1319 u16 w;
1320
1321 w = omap_readw(OMAP1610_DMA_LCD_CCR);
1322 /* If DMA was already active set the end_prog bit to have
1323 * the programmed register set loaded into the active
1324 * register set.
1325 */
1326 w |= 1 << 11; /* End_prog */
1327 if (!lcd_dma.single_transfer)
1328 w |= (3 << 8); /* Auto_init, repeat */
1329 omap_writew(w, OMAP1610_DMA_LCD_CCR);
1330 }
1331 }
1332
1333 void omap_stop_lcd_dma(void)
1334 {
1335 u16 w;
1336
1337 lcd_dma.active = 0;
1338 if (enable_1510_mode || !lcd_dma.ext_ctrl)
1339 return;
1340
1341 w = omap_readw(OMAP1610_DMA_LCD_CCR);
1342 w &= ~(1 << 7);
1343 omap_writew(w, OMAP1610_DMA_LCD_CCR);
1344
1345 w = omap_readw(OMAP1610_DMA_LCD_CTRL);
1346 w &= ~(1 << 8);
1347 omap_writew(w, OMAP1610_DMA_LCD_CTRL);
1348 }
1349
1350 /*----------------------------------------------------------------------------*/
1351
1352 static int __init omap_init_dma(void)
1353 {
1354 int ch, r;
1355
1356 if (cpu_is_omap15xx()) {
1357 printk(KERN_INFO "DMA support for OMAP15xx initialized\n");
1358 dma_chan_count = 9;
1359 enable_1510_mode = 1;
1360 } else if (cpu_is_omap16xx() || cpu_is_omap730()) {
1361 printk(KERN_INFO "OMAP DMA hardware version %d\n",
1362 omap_readw(OMAP_DMA_HW_ID));
1363 printk(KERN_INFO "DMA capabilities: %08x:%08x:%04x:%04x:%04x\n",
1364 (omap_readw(OMAP_DMA_CAPS_0_U) << 16) |
1365 omap_readw(OMAP_DMA_CAPS_0_L),
1366 (omap_readw(OMAP_DMA_CAPS_1_U) << 16) |
1367 omap_readw(OMAP_DMA_CAPS_1_L),
1368 omap_readw(OMAP_DMA_CAPS_2), omap_readw(OMAP_DMA_CAPS_3),
1369 omap_readw(OMAP_DMA_CAPS_4));
1370 if (!enable_1510_mode) {
1371 u16 w;
1372
1373 /* Disable OMAP 3.0/3.1 compatibility mode. */
1374 w = omap_readw(OMAP_DMA_GSCR);
1375 w |= 1 << 3;
1376 omap_writew(w, OMAP_DMA_GSCR);
1377 dma_chan_count = 16;
1378 } else
1379 dma_chan_count = 9;
1380 if (cpu_is_omap16xx()) {
1381 u16 w;
1382
1383 /* this would prevent OMAP sleep */
1384 w = omap_readw(OMAP1610_DMA_LCD_CTRL);
1385 w &= ~(1 << 8);
1386 omap_writew(w, OMAP1610_DMA_LCD_CTRL);
1387 }
1388 } else if (cpu_is_omap24xx()) {
1389 u8 revision = omap_readb(OMAP_DMA4_REVISION);
1390 printk(KERN_INFO "OMAP DMA hardware revision %d.%d\n",
1391 revision >> 4, revision & 0xf);
1392 dma_chan_count = OMAP_LOGICAL_DMA_CH_COUNT;
1393 } else {
1394 dma_chan_count = 0;
1395 return 0;
1396 }
1397
1398 memset(&lcd_dma, 0, sizeof(lcd_dma));
1399 spin_lock_init(&lcd_dma.lock);
1400 spin_lock_init(&dma_chan_lock);
1401 memset(&dma_chan, 0, sizeof(dma_chan));
1402
1403 for (ch = 0; ch < dma_chan_count; ch++) {
1404 omap_clear_dma(ch);
1405 dma_chan[ch].dev_id = -1;
1406 dma_chan[ch].next_lch = -1;
1407
1408 if (ch >= 6 && enable_1510_mode)
1409 continue;
1410
1411 if (cpu_class_is_omap1()) {
1412 /* request_irq() doesn't like dev_id (ie. ch) being
1413 * zero, so we have to kludge around this. */
1414 r = request_irq(omap1_dma_irq[ch],
1415 omap1_dma_irq_handler, 0, "DMA",
1416 (void *) (ch + 1));
1417 if (r != 0) {
1418 int i;
1419
1420 printk(KERN_ERR "unable to request IRQ %d "
1421 "for DMA (error %d)\n",
1422 omap1_dma_irq[ch], r);
1423 for (i = 0; i < ch; i++)
1424 free_irq(omap1_dma_irq[i],
1425 (void *) (i + 1));
1426 return r;
1427 }
1428 }
1429 }
1430
1431 if (cpu_is_omap24xx())
1432 setup_irq(INT_24XX_SDMA_IRQ0, &omap24xx_dma_irq);
1433
1434 /* FIXME: Update LCD DMA to work on 24xx */
1435 if (cpu_class_is_omap1()) {
1436 r = request_irq(INT_DMA_LCD, lcd_dma_irq_handler, 0,
1437 "LCD DMA", NULL);
1438 if (r != 0) {
1439 int i;
1440
1441 printk(KERN_ERR "unable to request IRQ for LCD DMA "
1442 "(error %d)\n", r);
1443 for (i = 0; i < dma_chan_count; i++)
1444 free_irq(omap1_dma_irq[i], (void *) (i + 1));
1445 return r;
1446 }
1447 }
1448
1449 return 0;
1450 }
1451
1452 arch_initcall(omap_init_dma);
1453
1454 EXPORT_SYMBOL(omap_get_dma_src_pos);
1455 EXPORT_SYMBOL(omap_get_dma_dst_pos);
1456 EXPORT_SYMBOL(omap_get_dma_src_addr_counter);
1457 EXPORT_SYMBOL(omap_clear_dma);
1458 EXPORT_SYMBOL(omap_set_dma_priority);
1459 EXPORT_SYMBOL(omap_request_dma);
1460 EXPORT_SYMBOL(omap_free_dma);
1461 EXPORT_SYMBOL(omap_start_dma);
1462 EXPORT_SYMBOL(omap_stop_dma);
1463 EXPORT_SYMBOL(omap_set_dma_callback);
1464 EXPORT_SYMBOL(omap_enable_dma_irq);
1465 EXPORT_SYMBOL(omap_disable_dma_irq);
1466
1467 EXPORT_SYMBOL(omap_set_dma_transfer_params);
1468 EXPORT_SYMBOL(omap_set_dma_color_mode);
1469 EXPORT_SYMBOL(omap_set_dma_write_mode);
1470
1471 EXPORT_SYMBOL(omap_set_dma_src_params);
1472 EXPORT_SYMBOL(omap_set_dma_src_index);
1473 EXPORT_SYMBOL(omap_set_dma_src_data_pack);
1474 EXPORT_SYMBOL(omap_set_dma_src_burst_mode);
1475
1476 EXPORT_SYMBOL(omap_set_dma_dest_params);
1477 EXPORT_SYMBOL(omap_set_dma_dest_index);
1478 EXPORT_SYMBOL(omap_set_dma_dest_data_pack);
1479 EXPORT_SYMBOL(omap_set_dma_dest_burst_mode);
1480
1481 EXPORT_SYMBOL(omap_set_dma_params);
1482
1483 EXPORT_SYMBOL(omap_dma_link_lch);
1484 EXPORT_SYMBOL(omap_dma_unlink_lch);
1485
1486 EXPORT_SYMBOL(omap_request_lcd_dma);
1487 EXPORT_SYMBOL(omap_free_lcd_dma);
1488 EXPORT_SYMBOL(omap_enable_lcd_dma);
1489 EXPORT_SYMBOL(omap_setup_lcd_dma);
1490 EXPORT_SYMBOL(omap_stop_lcd_dma);
1491 EXPORT_SYMBOL(omap_set_lcd_dma_b1);
1492 EXPORT_SYMBOL(omap_set_lcd_dma_single_transfer);
1493 EXPORT_SYMBOL(omap_set_lcd_dma_ext_controller);
1494 EXPORT_SYMBOL(omap_set_lcd_dma_b1_rotation);
1495 EXPORT_SYMBOL(omap_set_lcd_dma_b1_vxres);
1496 EXPORT_SYMBOL(omap_set_lcd_dma_b1_scale);
1497 EXPORT_SYMBOL(omap_set_lcd_dma_b1_mirror);
1498
WRT350N Kernel Patches