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[PATCH] ARM: 2812/1: OMAP update 7c/11: Move arch-omap to plat-omap
[linux-2.6/btrfs-unstable.git] / arch / arm / plat-omap / dma.c
blob015bd2cf869f70ec708558f1d37980a8b4968604
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 * Some functions based on earlier dma-omap.c Copyright (C) 2001 RidgeRun, Inc.
10 *
11 * Support functions for the OMAP internal DMA channels.
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
16 *
17 */
18
19 #include <linux/module.h>
20 #include <linux/init.h>
21 #include <linux/sched.h>
22 #include <linux/spinlock.h>
23 #include <linux/errno.h>
24 #include <linux/interrupt.h>
25
26 #include <asm/system.h>
27 #include <asm/irq.h>
28 #include <asm/hardware.h>
29 #include <asm/dma.h>
30 #include <asm/io.h>
31
32 #include <asm/arch/tc.h>
33
34 #define OMAP_DMA_ACTIVE 0x01
35
36 #define OMAP_DMA_CCR_EN (1 << 7)
37
38 #define OMAP_FUNC_MUX_ARM_BASE (0xfffe1000 + 0xec)
39
40 static int enable_1510_mode = 0;
41
42 struct omap_dma_lch {
43 int next_lch;
44 int dev_id;
45 u16 saved_csr;
46 u16 enabled_irqs;
47 const char *dev_name;
48 void (* callback)(int lch, u16 ch_status, void *data);
49 void *data;
50 long flags;
51 };
52
53 static int dma_chan_count;
54
55 static spinlock_t dma_chan_lock;
56 static struct omap_dma_lch dma_chan[OMAP_LOGICAL_DMA_CH_COUNT];
57
58 const static u8 dma_irq[OMAP_LOGICAL_DMA_CH_COUNT] = {
59 INT_DMA_CH0_6, INT_DMA_CH1_7, INT_DMA_CH2_8, INT_DMA_CH3,
60 INT_DMA_CH4, INT_DMA_CH5, INT_1610_DMA_CH6, INT_1610_DMA_CH7,
61 INT_1610_DMA_CH8, INT_1610_DMA_CH9, INT_1610_DMA_CH10,
62 INT_1610_DMA_CH11, INT_1610_DMA_CH12, INT_1610_DMA_CH13,
63 INT_1610_DMA_CH14, INT_1610_DMA_CH15, INT_DMA_LCD
64 };
65
66 static inline int get_gdma_dev(int req)
67 {
68 u32 reg = OMAP_FUNC_MUX_ARM_BASE + ((req - 1) / 5) * 4;
69 int shift = ((req - 1) % 5) * 6;
70
71 return ((omap_readl(reg) >> shift) & 0x3f) + 1;
72 }
73
74 static inline void set_gdma_dev(int req, int dev)
75 {
76 u32 reg = OMAP_FUNC_MUX_ARM_BASE + ((req - 1) / 5) * 4;
77 int shift = ((req - 1) % 5) * 6;
78 u32 l;
79
80 l = omap_readl(reg);
81 l &= ~(0x3f << shift);
82 l |= (dev - 1) << shift;
83 omap_writel(l, reg);
84 }
85
86 static void clear_lch_regs(int lch)
87 {
88 int i;
89 u32 lch_base = OMAP_DMA_BASE + lch * 0x40;
90
91 for (i = 0; i < 0x2c; i += 2)
92 omap_writew(0, lch_base + i);
93 }
94
95 void omap_set_dma_priority(int dst_port, int priority)
96 {
97 unsigned long reg;
98 u32 l;
99
100 switch (dst_port) {
101 case OMAP_DMA_PORT_OCP_T1: /* FFFECC00 */
102 reg = OMAP_TC_OCPT1_PRIOR;
103 break;
104 case OMAP_DMA_PORT_OCP_T2: /* FFFECCD0 */
105 reg = OMAP_TC_OCPT2_PRIOR;
106 break;
107 case OMAP_DMA_PORT_EMIFF: /* FFFECC08 */
108 reg = OMAP_TC_EMIFF_PRIOR;
109 break;
110 case OMAP_DMA_PORT_EMIFS: /* FFFECC04 */
111 reg = OMAP_TC_EMIFS_PRIOR;
112 break;
113 default:
114 BUG();
115 return;
116 }
117 l = omap_readl(reg);
118 l &= ~(0xf << 8);
119 l |= (priority & 0xf) << 8;
120 omap_writel(l, reg);
121 }
122
123 void omap_set_dma_transfer_params(int lch, int data_type, int elem_count,
124 int frame_count, int sync_mode)
125 {
126 u16 w;
127
128 w = omap_readw(OMAP_DMA_CSDP(lch));
129 w &= ~0x03;
130 w |= data_type;
131 omap_writew(w, OMAP_DMA_CSDP(lch));
132
133 w = omap_readw(OMAP_DMA_CCR(lch));
134 w &= ~(1 << 5);
135 if (sync_mode == OMAP_DMA_SYNC_FRAME)
136 w |= 1 << 5;
137 omap_writew(w, OMAP_DMA_CCR(lch));
138
139 w = omap_readw(OMAP_DMA_CCR2(lch));
140 w &= ~(1 << 2);
141 if (sync_mode == OMAP_DMA_SYNC_BLOCK)
142 w |= 1 << 2;
143 omap_writew(w, OMAP_DMA_CCR2(lch));
144
145 omap_writew(elem_count, OMAP_DMA_CEN(lch));
146 omap_writew(frame_count, OMAP_DMA_CFN(lch));
147
148 }
149 void omap_set_dma_color_mode(int lch, enum omap_dma_color_mode mode, u32 color)
150 {
151 u16 w;
152
153 BUG_ON(omap_dma_in_1510_mode());
154
155 w = omap_readw(OMAP_DMA_CCR2(lch)) & ~0x03;
156 switch (mode) {
157 case OMAP_DMA_CONSTANT_FILL:
158 w |= 0x01;
159 break;
160 case OMAP_DMA_TRANSPARENT_COPY:
161 w |= 0x02;
162 break;
163 case OMAP_DMA_COLOR_DIS:
164 break;
165 default:
166 BUG();
167 }
168 omap_writew(w, OMAP_DMA_CCR2(lch));
169
170 w = omap_readw(OMAP_DMA_LCH_CTRL(lch)) & ~0x0f;
171 /* Default is channel type 2D */
172 if (mode) {
173 omap_writew((u16)color, OMAP_DMA_COLOR_L(lch));
174 omap_writew((u16)(color >> 16), OMAP_DMA_COLOR_U(lch));
175 w |= 1; /* Channel type G */
176 }
177 omap_writew(w, OMAP_DMA_LCH_CTRL(lch));
178 }
179
180
181 void omap_set_dma_src_params(int lch, int src_port, int src_amode,
182 unsigned long src_start)
183 {
184 u16 w;
185
186 w = omap_readw(OMAP_DMA_CSDP(lch));
187 w &= ~(0x1f << 2);
188 w |= src_port << 2;
189 omap_writew(w, OMAP_DMA_CSDP(lch));
190
191 w = omap_readw(OMAP_DMA_CCR(lch));
192 w &= ~(0x03 << 12);
193 w |= src_amode << 12;
194 omap_writew(w, OMAP_DMA_CCR(lch));
195
196 omap_writew(src_start >> 16, OMAP_DMA_CSSA_U(lch));
197 omap_writew(src_start, OMAP_DMA_CSSA_L(lch));
198 }
199
200 void omap_set_dma_src_index(int lch, int eidx, int fidx)
201 {
202 omap_writew(eidx, OMAP_DMA_CSEI(lch));
203 omap_writew(fidx, OMAP_DMA_CSFI(lch));
204 }
205
206 void omap_set_dma_src_data_pack(int lch, int enable)
207 {
208 u16 w;
209
210 w = omap_readw(OMAP_DMA_CSDP(lch)) & ~(1 << 6);
211 w |= enable ? (1 << 6) : 0;
212 omap_writew(w, OMAP_DMA_CSDP(lch));
213 }
214
215 void omap_set_dma_src_burst_mode(int lch, enum omap_dma_burst_mode burst_mode)
216 {
217 u16 w;
218
219 w = omap_readw(OMAP_DMA_CSDP(lch)) & ~(0x03 << 7);
220 switch (burst_mode) {
221 case OMAP_DMA_DATA_BURST_DIS:
222 break;
223 case OMAP_DMA_DATA_BURST_4:
224 w |= (0x01 << 7);
225 break;
226 case OMAP_DMA_DATA_BURST_8:
227 /* not supported by current hardware
228 * w |= (0x03 << 7);
229 * fall through
230 */
231 default:
232 BUG();
233 }
234 omap_writew(w, OMAP_DMA_CSDP(lch));
235 }
236
237 void omap_set_dma_dest_params(int lch, int dest_port, int dest_amode,
238 unsigned long dest_start)
239 {
240 u16 w;
241
242 w = omap_readw(OMAP_DMA_CSDP(lch));
243 w &= ~(0x1f << 9);
244 w |= dest_port << 9;
245 omap_writew(w, OMAP_DMA_CSDP(lch));
246
247 w = omap_readw(OMAP_DMA_CCR(lch));
248 w &= ~(0x03 << 14);
249 w |= dest_amode << 14;
250 omap_writew(w, OMAP_DMA_CCR(lch));
251
252 omap_writew(dest_start >> 16, OMAP_DMA_CDSA_U(lch));
253 omap_writew(dest_start, OMAP_DMA_CDSA_L(lch));
254 }
255
256 void omap_set_dma_dest_index(int lch, int eidx, int fidx)
257 {
258 omap_writew(eidx, OMAP_DMA_CDEI(lch));
259 omap_writew(fidx, OMAP_DMA_CDFI(lch));
260 }
261
262 void omap_set_dma_dest_data_pack(int lch, int enable)
263 {
264 u16 w;
265
266 w = omap_readw(OMAP_DMA_CSDP(lch)) & ~(1 << 13);
267 w |= enable ? (1 << 13) : 0;
268 omap_writew(w, OMAP_DMA_CSDP(lch));
269 }
270
271 void omap_set_dma_dest_burst_mode(int lch, enum omap_dma_burst_mode burst_mode)
272 {
273 u16 w;
274
275 w = omap_readw(OMAP_DMA_CSDP(lch)) & ~(0x03 << 14);
276 switch (burst_mode) {
277 case OMAP_DMA_DATA_BURST_DIS:
278 break;
279 case OMAP_DMA_DATA_BURST_4:
280 w |= (0x01 << 14);
281 break;
282 case OMAP_DMA_DATA_BURST_8:
283 w |= (0x03 << 14);
284 break;
285 default:
286 printk(KERN_ERR "Invalid DMA burst mode\n");
287 BUG();
288 return;
289 }
290 omap_writew(w, OMAP_DMA_CSDP(lch));
291 }
292
293 static inline void init_intr(int lch)
294 {
295 u16 w;
296
297 /* Read CSR to make sure it's cleared. */
298 w = omap_readw(OMAP_DMA_CSR(lch));
299 /* Enable some nice interrupts. */
300 omap_writew(dma_chan[lch].enabled_irqs, OMAP_DMA_CICR(lch));
301 dma_chan[lch].flags |= OMAP_DMA_ACTIVE;
302 }
303
304 static inline void enable_lnk(int lch)
305 {
306 u16 w;
307
308 /* Clear the STOP_LNK bits */
309 w = omap_readw(OMAP_DMA_CLNK_CTRL(lch));
310 w &= ~(1 << 14);
311 omap_writew(w, OMAP_DMA_CLNK_CTRL(lch));
312
313 /* And set the ENABLE_LNK bits */
314 if (dma_chan[lch].next_lch != -1)
315 omap_writew(dma_chan[lch].next_lch | (1 << 15),
316 OMAP_DMA_CLNK_CTRL(lch));
317 }
318
319 static inline void disable_lnk(int lch)
320 {
321 u16 w;
322
323 /* Disable interrupts */
324 omap_writew(0, OMAP_DMA_CICR(lch));
325
326 /* Set the STOP_LNK bit */
327 w = omap_readw(OMAP_DMA_CLNK_CTRL(lch));
328 w |= (1 << 14);
329 w = omap_writew(w, OMAP_DMA_CLNK_CTRL(lch));
330
331 dma_chan[lch].flags &= ~OMAP_DMA_ACTIVE;
332 }
333
334 void omap_start_dma(int lch)
335 {
336 u16 w;
337
338 if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) {
339 int next_lch, cur_lch;
340 char dma_chan_link_map[OMAP_LOGICAL_DMA_CH_COUNT];
341
342 dma_chan_link_map[lch] = 1;
343 /* Set the link register of the first channel */
344 enable_lnk(lch);
345
346 memset(dma_chan_link_map, 0, sizeof(dma_chan_link_map));
347 cur_lch = dma_chan[lch].next_lch;
348 do {
349 next_lch = dma_chan[cur_lch].next_lch;
350
351 /* The loop case: we've been here already */
352 if (dma_chan_link_map[cur_lch])
353 break;
354 /* Mark the current channel */
355 dma_chan_link_map[cur_lch] = 1;
356
357 enable_lnk(cur_lch);
358 init_intr(cur_lch);
359
360 cur_lch = next_lch;
361 } while (next_lch != -1);
362 }
363
364 init_intr(lch);
365
366 w = omap_readw(OMAP_DMA_CCR(lch));
367 w |= OMAP_DMA_CCR_EN;
368 omap_writew(w, OMAP_DMA_CCR(lch));
369 dma_chan[lch].flags |= OMAP_DMA_ACTIVE;
370 }
371
372 void omap_stop_dma(int lch)
373 {
374 u16 w;
375
376 if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) {
377 int next_lch, cur_lch = lch;
378 char dma_chan_link_map[OMAP_LOGICAL_DMA_CH_COUNT];
379
380 memset(dma_chan_link_map, 0, sizeof(dma_chan_link_map));
381 do {
382 /* The loop case: we've been here already */
383 if (dma_chan_link_map[cur_lch])
384 break;
385 /* Mark the current channel */
386 dma_chan_link_map[cur_lch] = 1;
387
388 disable_lnk(cur_lch);
389
390 next_lch = dma_chan[cur_lch].next_lch;
391 cur_lch = next_lch;
392 } while (next_lch != -1);
393
394 return;
395 }
396 /* Disable all interrupts on the channel */
397 omap_writew(0, OMAP_DMA_CICR(lch));
398
399 w = omap_readw(OMAP_DMA_CCR(lch));
400 w &= ~OMAP_DMA_CCR_EN;
401 omap_writew(w, OMAP_DMA_CCR(lch));
402 dma_chan[lch].flags &= ~OMAP_DMA_ACTIVE;
403 }
404
405 void omap_enable_dma_irq(int lch, u16 bits)
406 {
407 dma_chan[lch].enabled_irqs |= bits;
408 }
409
410 void omap_disable_dma_irq(int lch, u16 bits)
411 {
412 dma_chan[lch].enabled_irqs &= ~bits;
413 }
414
415 static int dma_handle_ch(int ch)
416 {
417 u16 csr;
418
419 if (enable_1510_mode && ch >= 6) {
420 csr = dma_chan[ch].saved_csr;
421 dma_chan[ch].saved_csr = 0;
422 } else
423 csr = omap_readw(OMAP_DMA_CSR(ch));
424 if (enable_1510_mode && ch <= 2 && (csr >> 7) != 0) {
425 dma_chan[ch + 6].saved_csr = csr >> 7;
426 csr &= 0x7f;
427 }
428 if (!csr)
429 return 0;
430 if (unlikely(dma_chan[ch].dev_id == -1)) {
431 printk(KERN_WARNING "Spurious interrupt from DMA channel %d (CSR %04x)\n",
432 ch, csr);
433 return 0;
434 }
435 if (unlikely(csr & OMAP_DMA_TOUT_IRQ))
436 printk(KERN_WARNING "DMA timeout with device %d\n", dma_chan[ch].dev_id);
437 if (unlikely(csr & OMAP_DMA_DROP_IRQ))
438 printk(KERN_WARNING "DMA synchronization event drop occurred with device %d\n",
439 dma_chan[ch].dev_id);
440 if (likely(csr & OMAP_DMA_BLOCK_IRQ))
441 dma_chan[ch].flags &= ~OMAP_DMA_ACTIVE;
442 if (likely(dma_chan[ch].callback != NULL))
443 dma_chan[ch].callback(ch, csr, dma_chan[ch].data);
444 return 1;
445 }
446
447 static irqreturn_t dma_irq_handler(int irq, void *dev_id, struct pt_regs *regs)
448 {
449 int ch = ((int) dev_id) - 1;
450 int handled = 0;
451
452 for (;;) {
453 int handled_now = 0;
454
455 handled_now += dma_handle_ch(ch);
456 if (enable_1510_mode && dma_chan[ch + 6].saved_csr)
457 handled_now += dma_handle_ch(ch + 6);
458 if (!handled_now)
459 break;
460 handled += handled_now;
461 }
462
463 return handled ? IRQ_HANDLED : IRQ_NONE;
464 }
465
466 int omap_request_dma(int dev_id, const char *dev_name,
467 void (* callback)(int lch, u16 ch_status, void *data),
468 void *data, int *dma_ch_out)
469 {
470 int ch, free_ch = -1;
471 unsigned long flags;
472 struct omap_dma_lch *chan;
473
474 spin_lock_irqsave(&dma_chan_lock, flags);
475 for (ch = 0; ch < dma_chan_count; ch++) {
476 if (free_ch == -1 && dma_chan[ch].dev_id == -1) {
477 free_ch = ch;
478 if (dev_id == 0)
479 break;
480 }
481 }
482 if (free_ch == -1) {
483 spin_unlock_irqrestore(&dma_chan_lock, flags);
484 return -EBUSY;
485 }
486 chan = dma_chan + free_ch;
487 chan->dev_id = dev_id;
488 clear_lch_regs(free_ch);
489 spin_unlock_irqrestore(&dma_chan_lock, flags);
490
491 chan->dev_id = dev_id;
492 chan->dev_name = dev_name;
493 chan->callback = callback;
494 chan->data = data;
495 chan->enabled_irqs = OMAP_DMA_TOUT_IRQ | OMAP_DMA_DROP_IRQ | OMAP_DMA_BLOCK_IRQ;
496
497 if (cpu_is_omap16xx()) {
498 /* If the sync device is set, configure it dynamically. */
499 if (dev_id != 0) {
500 set_gdma_dev(free_ch + 1, dev_id);
501 dev_id = free_ch + 1;
502 }
503 /* Disable the 1510 compatibility mode and set the sync device
504 * id. */
505 omap_writew(dev_id | (1 << 10), OMAP_DMA_CCR(free_ch));
506 } else {
507 omap_writew(dev_id, OMAP_DMA_CCR(free_ch));
508 }
509 *dma_ch_out = free_ch;
510
511 return 0;
512 }
513
514 void omap_free_dma(int ch)
515 {
516 unsigned long flags;
517
518 spin_lock_irqsave(&dma_chan_lock, flags);
519 if (dma_chan[ch].dev_id == -1) {
520 printk("omap_dma: trying to free nonallocated DMA channel %d\n", ch);
521 spin_unlock_irqrestore(&dma_chan_lock, flags);
522 return;
523 }
524 dma_chan[ch].dev_id = -1;
525 spin_unlock_irqrestore(&dma_chan_lock, flags);
526
527 /* Disable all DMA interrupts for the channel. */
528 omap_writew(0, OMAP_DMA_CICR(ch));
529 /* Make sure the DMA transfer is stopped. */
530 omap_writew(0, OMAP_DMA_CCR(ch));
531 }
532
533 int omap_dma_in_1510_mode(void)
534 {
535 return enable_1510_mode;
536 }
537
538 /*
539 * lch_queue DMA will start right after lch_head one is finished.
540 * For this DMA link to start, you still need to start (see omap_start_dma)
541 * the first one. That will fire up the entire queue.
542 */
543 void omap_dma_link_lch (int lch_head, int lch_queue)
544 {
545 if (omap_dma_in_1510_mode()) {
546 printk(KERN_ERR "DMA linking is not supported in 1510 mode\n");
547 BUG();
548 return;
549 }
550
551 if ((dma_chan[lch_head].dev_id == -1) ||
552 (dma_chan[lch_queue].dev_id == -1)) {
553 printk(KERN_ERR "omap_dma: trying to link non requested channels\n");
554 dump_stack();
555 }
556
557 dma_chan[lch_head].next_lch = lch_queue;
558 }
559
560 /*
561 * Once the DMA queue is stopped, we can destroy it.
562 */
563 void omap_dma_unlink_lch (int lch_head, int lch_queue)
564 {
565 if (omap_dma_in_1510_mode()) {
566 printk(KERN_ERR "DMA linking is not supported in 1510 mode\n");
567 BUG();
568 return;
569 }
570
571 if (dma_chan[lch_head].next_lch != lch_queue ||
572 dma_chan[lch_head].next_lch == -1) {
573 printk(KERN_ERR "omap_dma: trying to unlink non linked channels\n");
574 dump_stack();
575 }
576
577
578 if ((dma_chan[lch_head].flags & OMAP_DMA_ACTIVE) ||
579 (dma_chan[lch_head].flags & OMAP_DMA_ACTIVE)) {
580 printk(KERN_ERR "omap_dma: You need to stop the DMA channels before unlinking\n");
581 dump_stack();
582 }
583
584 dma_chan[lch_head].next_lch = -1;
585 }
586
587
588 static struct lcd_dma_info {
589 spinlock_t lock;
590 int reserved;
591 void (* callback)(u16 status, void *data);
592 void *cb_data;
593
594 int active;
595 unsigned long addr, size;
596 int rotate, data_type, xres, yres;
597 int vxres;
598 int mirror;
599 int xscale, yscale;
600 int ext_ctrl;
601 int src_port;
602 int single_transfer;
603 } lcd_dma;
604
605 void omap_set_lcd_dma_b1(unsigned long addr, u16 fb_xres, u16 fb_yres,
606 int data_type)
607 {
608 lcd_dma.addr = addr;
609 lcd_dma.data_type = data_type;
610 lcd_dma.xres = fb_xres;
611 lcd_dma.yres = fb_yres;
612 }
613
614 void omap_set_lcd_dma_src_port(int port)
615 {
616 lcd_dma.src_port = port;
617 }
618
619 void omap_set_lcd_dma_ext_controller(int external)
620 {
621 lcd_dma.ext_ctrl = external;
622 }
623
624 void omap_set_lcd_dma_single_transfer(int single)
625 {
626 lcd_dma.single_transfer = single;
627 }
628
629
630 void omap_set_lcd_dma_b1_rotation(int rotate)
631 {
632 if (omap_dma_in_1510_mode()) {
633 printk(KERN_ERR "DMA rotation is not supported in 1510 mode\n");
634 BUG();
635 return;
636 }
637 lcd_dma.rotate = rotate;
638 }
639
640 void omap_set_lcd_dma_b1_mirror(int mirror)
641 {
642 if (omap_dma_in_1510_mode()) {
643 printk(KERN_ERR "DMA mirror is not supported in 1510 mode\n");
644 BUG();
645 }
646 lcd_dma.mirror = mirror;
647 }
648
649 void omap_set_lcd_dma_b1_vxres(unsigned long vxres)
650 {
651 if (omap_dma_in_1510_mode()) {
652 printk(KERN_ERR "DMA virtual resulotion is not supported "
653 "in 1510 mode\n");
654 BUG();
655 }
656 lcd_dma.vxres = vxres;
657 }
658
659 void omap_set_lcd_dma_b1_scale(unsigned int xscale, unsigned int yscale)
660 {
661 if (omap_dma_in_1510_mode()) {
662 printk(KERN_ERR "DMA scale is not supported in 1510 mode\n");
663 BUG();
664 }
665 lcd_dma.xscale = xscale;
666 lcd_dma.yscale = yscale;
667 }
668
669 static void set_b1_regs(void)
670 {
671 unsigned long top, bottom;
672 int es;
673 u16 w;
674 unsigned long en, fn;
675 long ei, fi;
676 unsigned long vxres;
677 unsigned int xscale, yscale;
678
679 switch (lcd_dma.data_type) {
680 case OMAP_DMA_DATA_TYPE_S8:
681 es = 1;
682 break;
683 case OMAP_DMA_DATA_TYPE_S16:
684 es = 2;
685 break;
686 case OMAP_DMA_DATA_TYPE_S32:
687 es = 4;
688 break;
689 default:
690 BUG();
691 return;
692 }
693
694 vxres = lcd_dma.vxres ? lcd_dma.vxres : lcd_dma.xres;
695 xscale = lcd_dma.xscale ? lcd_dma.xscale : 1;
696 yscale = lcd_dma.yscale ? lcd_dma.yscale : 1;
697 BUG_ON(vxres < lcd_dma.xres);
698 #define PIXADDR(x,y) (lcd_dma.addr + ((y) * vxres * yscale + (x) * xscale) * es)
699 #define PIXSTEP(sx, sy, dx, dy) (PIXADDR(dx, dy) - PIXADDR(sx, sy) - es + 1)
700 switch (lcd_dma.rotate) {
701 case 0:
702 if (!lcd_dma.mirror) {
703 top = PIXADDR(0, 0);
704 bottom = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
705 /* 1510 DMA requires the bottom address to be 2 more
706 * than the actual last memory access location. */
707 if (omap_dma_in_1510_mode() &&
708 lcd_dma.data_type == OMAP_DMA_DATA_TYPE_S32)
709 bottom += 2;
710 ei = PIXSTEP(0, 0, 1, 0);
711 fi = PIXSTEP(lcd_dma.xres - 1, 0, 0, 1);
712 } else {
713 top = PIXADDR(lcd_dma.xres - 1, 0);
714 bottom = PIXADDR(0, lcd_dma.yres - 1);
715 ei = PIXSTEP(1, 0, 0, 0);
716 fi = PIXSTEP(0, 0, lcd_dma.xres - 1, 1);
717 }
718 en = lcd_dma.xres;
719 fn = lcd_dma.yres;
720 break;
721 case 90:
722 if (!lcd_dma.mirror) {
723 top = PIXADDR(0, lcd_dma.yres - 1);
724 bottom = PIXADDR(lcd_dma.xres - 1, 0);
725 ei = PIXSTEP(0, 1, 0, 0);
726 fi = PIXSTEP(0, 0, 1, lcd_dma.yres - 1);
727 } else {
728 top = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
729 bottom = PIXADDR(0, 0);
730 ei = PIXSTEP(0, 1, 0, 0);
731 fi = PIXSTEP(1, 0, 0, lcd_dma.yres - 1);
732 }
733 en = lcd_dma.yres;
734 fn = lcd_dma.xres;
735 break;
736 case 180:
737 if (!lcd_dma.mirror) {
738 top = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
739 bottom = PIXADDR(0, 0);
740 ei = PIXSTEP(1, 0, 0, 0);
741 fi = PIXSTEP(0, 1, lcd_dma.xres - 1, 0);
742 } else {
743 top = PIXADDR(0, lcd_dma.yres - 1);
744 bottom = PIXADDR(lcd_dma.xres - 1, 0);
745 ei = PIXSTEP(0, 0, 1, 0);
746 fi = PIXSTEP(lcd_dma.xres - 1, 1, 0, 0);
747 }
748 en = lcd_dma.xres;
749 fn = lcd_dma.yres;
750 break;
751 case 270:
752 if (!lcd_dma.mirror) {
753 top = PIXADDR(lcd_dma.xres - 1, 0);
754 bottom = PIXADDR(0, lcd_dma.yres - 1);
755 ei = PIXSTEP(0, 0, 0, 1);
756 fi = PIXSTEP(1, lcd_dma.yres - 1, 0, 0);
757 } else {
758 top = PIXADDR(0, 0);
759 bottom = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
760 ei = PIXSTEP(0, 0, 0, 1);
761 fi = PIXSTEP(0, lcd_dma.yres - 1, 1, 0);
762 }
763 en = lcd_dma.yres;
764 fn = lcd_dma.xres;
765 break;
766 default:
767 BUG();
768 return; /* Supress warning about uninitialized vars */
769 }
770
771 if (omap_dma_in_1510_mode()) {
772 omap_writew(top >> 16, OMAP1510_DMA_LCD_TOP_F1_U);
773 omap_writew(top, OMAP1510_DMA_LCD_TOP_F1_L);
774 omap_writew(bottom >> 16, OMAP1510_DMA_LCD_BOT_F1_U);
775 omap_writew(bottom, OMAP1510_DMA_LCD_BOT_F1_L);
776
777 return;
778 }
779
780 /* 1610 regs */
781 omap_writew(top >> 16, OMAP1610_DMA_LCD_TOP_B1_U);
782 omap_writew(top, OMAP1610_DMA_LCD_TOP_B1_L);
783 omap_writew(bottom >> 16, OMAP1610_DMA_LCD_BOT_B1_U);
784 omap_writew(bottom, OMAP1610_DMA_LCD_BOT_B1_L);
785
786 omap_writew(en, OMAP1610_DMA_LCD_SRC_EN_B1);
787 omap_writew(fn, OMAP1610_DMA_LCD_SRC_FN_B1);
788
789 w = omap_readw(OMAP1610_DMA_LCD_CSDP);
790 w &= ~0x03;
791 w |= lcd_dma.data_type;
792 omap_writew(w, OMAP1610_DMA_LCD_CSDP);
793
794 w = omap_readw(OMAP1610_DMA_LCD_CTRL);
795 /* Always set the source port as SDRAM for now*/
796 w &= ~(0x03 << 6);
797 if (lcd_dma.ext_ctrl)
798 w |= 1 << 8;
799 else
800 w &= ~(1 << 8);
801 if (lcd_dma.callback != NULL)
802 w |= 1 << 1; /* Block interrupt enable */
803 else
804 w &= ~(1 << 1);
805 omap_writew(w, OMAP1610_DMA_LCD_CTRL);
806
807 if (!(lcd_dma.rotate || lcd_dma.mirror ||
808 lcd_dma.vxres || lcd_dma.xscale || lcd_dma.yscale))
809 return;
810
811 w = omap_readw(OMAP1610_DMA_LCD_CCR);
812 /* Set the double-indexed addressing mode */
813 w |= (0x03 << 12);
814 omap_writew(w, OMAP1610_DMA_LCD_CCR);
815
816 omap_writew(ei, OMAP1610_DMA_LCD_SRC_EI_B1);
817 omap_writew(fi >> 16, OMAP1610_DMA_LCD_SRC_FI_B1_U);
818 omap_writew(fi, OMAP1610_DMA_LCD_SRC_FI_B1_L);
819 }
820
821 static irqreturn_t lcd_dma_irq_handler(int irq, void *dev_id, struct pt_regs *regs)
822 {
823 u16 w;
824
825 w = omap_readw(OMAP1610_DMA_LCD_CTRL);
826 if (unlikely(!(w & (1 << 3)))) {
827 printk(KERN_WARNING "Spurious LCD DMA IRQ\n");
828 return IRQ_NONE;
829 }
830 /* Ack the IRQ */
831 w |= (1 << 3);
832 omap_writew(w, OMAP1610_DMA_LCD_CTRL);
833 lcd_dma.active = 0;
834 if (lcd_dma.callback != NULL)
835 lcd_dma.callback(w, lcd_dma.cb_data);
836
837 return IRQ_HANDLED;
838 }
839
840 int omap_request_lcd_dma(void (* callback)(u16 status, void *data),
841 void *data)
842 {
843 spin_lock_irq(&lcd_dma.lock);
844 if (lcd_dma.reserved) {
845 spin_unlock_irq(&lcd_dma.lock);
846 printk(KERN_ERR "LCD DMA channel already reserved\n");
847 BUG();
848 return -EBUSY;
849 }
850 lcd_dma.reserved = 1;
851 spin_unlock_irq(&lcd_dma.lock);
852 lcd_dma.callback = callback;
853 lcd_dma.cb_data = data;
854 lcd_dma.active = 0;
855 lcd_dma.single_transfer = 0;
856 lcd_dma.rotate = 0;
857 lcd_dma.vxres = 0;
858 lcd_dma.mirror = 0;
859 lcd_dma.xscale = 0;
860 lcd_dma.yscale = 0;
861 lcd_dma.ext_ctrl = 0;
862 lcd_dma.src_port = 0;
863
864 return 0;
865 }
866
867 void omap_free_lcd_dma(void)
868 {
869 spin_lock(&lcd_dma.lock);
870 if (!lcd_dma.reserved) {
871 spin_unlock(&lcd_dma.lock);
872 printk(KERN_ERR "LCD DMA is not reserved\n");
873 BUG();
874 return;
875 }
876 if (!enable_1510_mode)
877 omap_writew(omap_readw(OMAP1610_DMA_LCD_CCR) & ~1, OMAP1610_DMA_LCD_CCR);
878 lcd_dma.reserved = 0;
879 spin_unlock(&lcd_dma.lock);
880 }
881
882 void omap_enable_lcd_dma(void)
883 {
884 u16 w;
885
886 /* Set the Enable bit only if an external controller is
887 * connected. Otherwise the OMAP internal controller will
888 * start the transfer when it gets enabled.
889 */
890 if (enable_1510_mode || !lcd_dma.ext_ctrl)
891 return;
892 w = omap_readw(OMAP1610_DMA_LCD_CCR);
893 w |= 1 << 7;
894 omap_writew(w, OMAP1610_DMA_LCD_CCR);
895 lcd_dma.active = 1;
896 }
897
898 void omap_setup_lcd_dma(void)
899 {
900 BUG_ON(lcd_dma.active);
901 if (!enable_1510_mode) {
902 /* Set some reasonable defaults */
903 omap_writew(0x5440, OMAP1610_DMA_LCD_CCR);
904 omap_writew(0x9102, OMAP1610_DMA_LCD_CSDP);
905 omap_writew(0x0004, OMAP1610_DMA_LCD_LCH_CTRL);
906 }
907 set_b1_regs();
908 if (!enable_1510_mode) {
909 u16 w;
910
911 w = omap_readw(OMAP1610_DMA_LCD_CCR);
912 /* If DMA was already active set the end_prog bit to have
913 * the programmed register set loaded into the active
914 * register set.
915 */
916 w |= 1 << 11; /* End_prog */
917 if (!lcd_dma.single_transfer)
918 w |= (3 << 8); /* Auto_init, repeat */
919 omap_writew(w, OMAP1610_DMA_LCD_CCR);
920 }
921 }
922
923 void omap_stop_lcd_dma(void)
924 {
925 lcd_dma.active = 0;
926 if (!enable_1510_mode && lcd_dma.ext_ctrl)
927 omap_writew(omap_readw(OMAP1610_DMA_LCD_CCR) & ~(1 << 7),
928 OMAP1610_DMA_LCD_CCR);
929 }
930
931 /*
932 * Clears any DMA state so the DMA engine is ready to restart with new buffers
933 * through omap_start_dma(). Any buffers in flight are discarded.
934 */
935 void omap_clear_dma(int lch)
936 {
937 unsigned long flags;
938 int status;
939
940 local_irq_save(flags);
941 omap_writew(omap_readw(OMAP_DMA_CCR(lch)) & ~OMAP_DMA_CCR_EN,
942 OMAP_DMA_CCR(lch));
943 status = OMAP_DMA_CSR(lch); /* clear pending interrupts */
944 local_irq_restore(flags);
945 }
946
947 /*
948 * Returns current physical source address for the given DMA channel.
949 * If the channel is running the caller must disable interrupts prior calling
950 * this function and process the returned value before re-enabling interrupt to
951 * prevent races with the interrupt handler. Note that in continuous mode there
952 * is a chance for CSSA_L register overflow inbetween the two reads resulting
953 * in incorrect return value.
954 */
955 dma_addr_t omap_get_dma_src_pos(int lch)
956 {
957 return (dma_addr_t) (OMAP_DMA_CSSA_L(lch) |
958 (OMAP_DMA_CSSA_U(lch) << 16));
959 }
960
961 /*
962 * Returns current physical destination address for the given DMA channel.
963 * If the channel is running the caller must disable interrupts prior calling
964 * this function and process the returned value before re-enabling interrupt to
965 * prevent races with the interrupt handler. Note that in continuous mode there
966 * is a chance for CDSA_L register overflow inbetween the two reads resulting
967 * in incorrect return value.
968 */
969 dma_addr_t omap_get_dma_dst_pos(int lch)
970 {
971 return (dma_addr_t) (OMAP_DMA_CDSA_L(lch) |
972 (OMAP_DMA_CDSA_U(lch) << 16));
973 }
974
975 static int __init omap_init_dma(void)
976 {
977 int ch, r;
978
979 if (cpu_is_omap1510()) {
980 printk(KERN_INFO "DMA support for OMAP1510 initialized\n");
981 dma_chan_count = 9;
982 enable_1510_mode = 1;
983 } else if (cpu_is_omap16xx() || cpu_is_omap730()) {
984 printk(KERN_INFO "OMAP DMA hardware version %d\n",
985 omap_readw(OMAP_DMA_HW_ID));
986 printk(KERN_INFO "DMA capabilities: %08x:%08x:%04x:%04x:%04x\n",
987 (omap_readw(OMAP_DMA_CAPS_0_U) << 16) | omap_readw(OMAP_DMA_CAPS_0_L),
988 (omap_readw(OMAP_DMA_CAPS_1_U) << 16) | omap_readw(OMAP_DMA_CAPS_1_L),
989 omap_readw(OMAP_DMA_CAPS_2), omap_readw(OMAP_DMA_CAPS_3),
990 omap_readw(OMAP_DMA_CAPS_4));
991 if (!enable_1510_mode) {
992 u16 w;
993
994 /* Disable OMAP 3.0/3.1 compatibility mode. */
995 w = omap_readw(OMAP_DMA_GSCR);
996 w |= 1 << 3;
997 omap_writew(w, OMAP_DMA_GSCR);
998 dma_chan_count = 16;
999 } else
1000 dma_chan_count = 9;
1001 } else {
1002 dma_chan_count = 0;
1003 return 0;
1004 }
1005
1006 memset(&lcd_dma, 0, sizeof(lcd_dma));
1007 spin_lock_init(&lcd_dma.lock);
1008 spin_lock_init(&dma_chan_lock);
1009 memset(&dma_chan, 0, sizeof(dma_chan));
1010
1011 for (ch = 0; ch < dma_chan_count; ch++) {
1012 dma_chan[ch].dev_id = -1;
1013 dma_chan[ch].next_lch = -1;
1014
1015 if (ch >= 6 && enable_1510_mode)
1016 continue;
1017
1018 /* request_irq() doesn't like dev_id (ie. ch) being zero,
1019 * so we have to kludge around this. */
1020 r = request_irq(dma_irq[ch], dma_irq_handler, 0, "DMA",
1021 (void *) (ch + 1));
1022 if (r != 0) {
1023 int i;
1024
1025 printk(KERN_ERR "unable to request IRQ %d for DMA (error %d)\n",
1026 dma_irq[ch], r);
1027 for (i = 0; i < ch; i++)
1028 free_irq(dma_irq[i], (void *) (i + 1));
1029 return r;
1030 }
1031 }
1032 r = request_irq(INT_DMA_LCD, lcd_dma_irq_handler, 0, "LCD DMA", NULL);
1033 if (r != 0) {
1034 int i;
1035
1036 printk(KERN_ERR "unable to request IRQ for LCD DMA (error %d)\n", r);
1037 for (i = 0; i < dma_chan_count; i++)
1038 free_irq(dma_irq[i], (void *) (i + 1));
1039 return r;
1040 }
1041 return 0;
1042 }
1043
1044 arch_initcall(omap_init_dma);
1045
1046
1047 EXPORT_SYMBOL(omap_get_dma_src_pos);
1048 EXPORT_SYMBOL(omap_get_dma_dst_pos);
1049 EXPORT_SYMBOL(omap_clear_dma);
1050 EXPORT_SYMBOL(omap_set_dma_priority);
1051 EXPORT_SYMBOL(omap_request_dma);
1052 EXPORT_SYMBOL(omap_free_dma);
1053 EXPORT_SYMBOL(omap_start_dma);
1054 EXPORT_SYMBOL(omap_stop_dma);
1055 EXPORT_SYMBOL(omap_enable_dma_irq);
1056 EXPORT_SYMBOL(omap_disable_dma_irq);
1057
1058 EXPORT_SYMBOL(omap_set_dma_transfer_params);
1059 EXPORT_SYMBOL(omap_set_dma_color_mode);
1060
1061 EXPORT_SYMBOL(omap_set_dma_src_params);
1062 EXPORT_SYMBOL(omap_set_dma_src_index);
1063 EXPORT_SYMBOL(omap_set_dma_src_data_pack);
1064 EXPORT_SYMBOL(omap_set_dma_src_burst_mode);
1065
1066 EXPORT_SYMBOL(omap_set_dma_dest_params);
1067 EXPORT_SYMBOL(omap_set_dma_dest_index);
1068 EXPORT_SYMBOL(omap_set_dma_dest_data_pack);
1069 EXPORT_SYMBOL(omap_set_dma_dest_burst_mode);
1070
1071 EXPORT_SYMBOL(omap_dma_link_lch);
1072 EXPORT_SYMBOL(omap_dma_unlink_lch);
1073
1074 EXPORT_SYMBOL(omap_request_lcd_dma);
1075 EXPORT_SYMBOL(omap_free_lcd_dma);
1076 EXPORT_SYMBOL(omap_enable_lcd_dma);
1077 EXPORT_SYMBOL(omap_setup_lcd_dma);
1078 EXPORT_SYMBOL(omap_stop_lcd_dma);
1079 EXPORT_SYMBOL(omap_set_lcd_dma_b1);
1080 EXPORT_SYMBOL(omap_set_lcd_dma_single_transfer);
1081 EXPORT_SYMBOL(omap_set_lcd_dma_ext_controller);
1082 EXPORT_SYMBOL(omap_set_lcd_dma_b1_rotation);
1083 EXPORT_SYMBOL(omap_set_lcd_dma_b1_vxres);
1084 EXPORT_SYMBOL(omap_set_lcd_dma_b1_scale);
1085 EXPORT_SYMBOL(omap_set_lcd_dma_b1_mirror);
1086
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