Merge git://git.infradead.org/~kmpark/onenand-mtd-2.6
[linux-2.6] / arch / arm / plat-omap / dma.c
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