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[PATCH] hrtimers: fix HRTIMER_CB_IRQSAFE_NO_SOFTIRQ description
[wrt350n-kernel.git] / drivers / char / drm / mga_dma.c
blobc2a4bac14521f2b50d9257544ae45066e44620b4
1 /* mga_dma.c -- DMA support for mga g200/g400 -*- linux-c -*-
2 * Created: Mon Dec 13 01:50:01 1999 by jhartmann@precisioninsight.com
3 *
4 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
5 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
6 * All Rights Reserved.
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the "Software"),
10 * to deal in the Software without restriction, including without limitation
11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
12 * and/or sell copies of the Software, and to permit persons to whom the
13 * Software is furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice (including the next
16 * paragraph) shall be included in all copies or substantial portions of the
17 * Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
23 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
24 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
25 * DEALINGS IN THE SOFTWARE.
26 */
27
28 /**
29 * \file mga_dma.c
30 * DMA support for MGA G200 / G400.
31 *
32 * \author Rickard E. (Rik) Faith <faith@valinux.com>
33 * \author Jeff Hartmann <jhartmann@valinux.com>
34 * \author Keith Whitwell <keith@tungstengraphics.com>
35 * \author Gareth Hughes <gareth@valinux.com>
36 */
37
38 #include "drmP.h"
39 #include "drm.h"
40 #include "drm_sarea.h"
41 #include "mga_drm.h"
42 #include "mga_drv.h"
43
44 #define MGA_DEFAULT_USEC_TIMEOUT 10000
45 #define MGA_FREELIST_DEBUG 0
46
47 #define MINIMAL_CLEANUP 0
48 #define FULL_CLEANUP 1
49 static int mga_do_cleanup_dma(drm_device_t *dev, int full_cleanup);
50
51 /* ================================================================
52 * Engine control
53 */
54
55 int mga_do_wait_for_idle(drm_mga_private_t * dev_priv)
56 {
57 u32 status = 0;
58 int i;
59 DRM_DEBUG("\n");
60
61 for (i = 0; i < dev_priv->usec_timeout; i++) {
62 status = MGA_READ(MGA_STATUS) & MGA_ENGINE_IDLE_MASK;
63 if (status == MGA_ENDPRDMASTS) {
64 MGA_WRITE8(MGA_CRTC_INDEX, 0);
65 return 0;
66 }
67 DRM_UDELAY(1);
68 }
69
70 #if MGA_DMA_DEBUG
71 DRM_ERROR("failed!\n");
72 DRM_INFO(" status=0x%08x\n", status);
73 #endif
74 return DRM_ERR(EBUSY);
75 }
76
77 static int mga_do_dma_reset(drm_mga_private_t * dev_priv)
78 {
79 drm_mga_sarea_t *sarea_priv = dev_priv->sarea_priv;
80 drm_mga_primary_buffer_t *primary = &dev_priv->prim;
81
82 DRM_DEBUG("\n");
83
84 /* The primary DMA stream should look like new right about now.
85 */
86 primary->tail = 0;
87 primary->space = primary->size;
88 primary->last_flush = 0;
89
90 sarea_priv->last_wrap = 0;
91
92 /* FIXME: Reset counters, buffer ages etc...
93 */
94
95 /* FIXME: What else do we need to reinitialize? WARP stuff?
96 */
97
98 return 0;
99 }
100
101 /* ================================================================
102 * Primary DMA stream
103 */
104
105 void mga_do_dma_flush(drm_mga_private_t * dev_priv)
106 {
107 drm_mga_primary_buffer_t *primary = &dev_priv->prim;
108 u32 head, tail;
109 u32 status = 0;
110 int i;
111 DMA_LOCALS;
112 DRM_DEBUG("\n");
113
114 /* We need to wait so that we can do an safe flush */
115 for (i = 0; i < dev_priv->usec_timeout; i++) {
116 status = MGA_READ(MGA_STATUS) & MGA_ENGINE_IDLE_MASK;
117 if (status == MGA_ENDPRDMASTS)
118 break;
119 DRM_UDELAY(1);
120 }
121
122 if (primary->tail == primary->last_flush) {
123 DRM_DEBUG(" bailing out...\n");
124 return;
125 }
126
127 tail = primary->tail + dev_priv->primary->offset;
128
129 /* We need to pad the stream between flushes, as the card
130 * actually (partially?) reads the first of these commands.
131 * See page 4-16 in the G400 manual, middle of the page or so.
132 */
133 BEGIN_DMA(1);
134
135 DMA_BLOCK(MGA_DMAPAD, 0x00000000,
136 MGA_DMAPAD, 0x00000000,
137 MGA_DMAPAD, 0x00000000, MGA_DMAPAD, 0x00000000);
138
139 ADVANCE_DMA();
140
141 primary->last_flush = primary->tail;
142
143 head = MGA_READ(MGA_PRIMADDRESS);
144
145 if (head <= tail) {
146 primary->space = primary->size - primary->tail;
147 } else {
148 primary->space = head - tail;
149 }
150
151 DRM_DEBUG(" head = 0x%06lx\n", head - dev_priv->primary->offset);
152 DRM_DEBUG(" tail = 0x%06lx\n", tail - dev_priv->primary->offset);
153 DRM_DEBUG(" space = 0x%06x\n", primary->space);
154
155 mga_flush_write_combine();
156 MGA_WRITE(MGA_PRIMEND, tail | dev_priv->dma_access);
157
158 DRM_DEBUG("done.\n");
159 }
160
161 void mga_do_dma_wrap_start(drm_mga_private_t * dev_priv)
162 {
163 drm_mga_primary_buffer_t *primary = &dev_priv->prim;
164 u32 head, tail;
165 DMA_LOCALS;
166 DRM_DEBUG("\n");
167
168 BEGIN_DMA_WRAP();
169
170 DMA_BLOCK(MGA_DMAPAD, 0x00000000,
171 MGA_DMAPAD, 0x00000000,
172 MGA_DMAPAD, 0x00000000, MGA_DMAPAD, 0x00000000);
173
174 ADVANCE_DMA();
175
176 tail = primary->tail + dev_priv->primary->offset;
177
178 primary->tail = 0;
179 primary->last_flush = 0;
180 primary->last_wrap++;
181
182 head = MGA_READ(MGA_PRIMADDRESS);
183
184 if (head == dev_priv->primary->offset) {
185 primary->space = primary->size;
186 } else {
187 primary->space = head - dev_priv->primary->offset;
188 }
189
190 DRM_DEBUG(" head = 0x%06lx\n", head - dev_priv->primary->offset);
191 DRM_DEBUG(" tail = 0x%06x\n", primary->tail);
192 DRM_DEBUG(" wrap = %d\n", primary->last_wrap);
193 DRM_DEBUG(" space = 0x%06x\n", primary->space);
194
195 mga_flush_write_combine();
196 MGA_WRITE(MGA_PRIMEND, tail | dev_priv->dma_access);
197
198 set_bit(0, &primary->wrapped);
199 DRM_DEBUG("done.\n");
200 }
201
202 void mga_do_dma_wrap_end(drm_mga_private_t * dev_priv)
203 {
204 drm_mga_primary_buffer_t *primary = &dev_priv->prim;
205 drm_mga_sarea_t *sarea_priv = dev_priv->sarea_priv;
206 u32 head = dev_priv->primary->offset;
207 DRM_DEBUG("\n");
208
209 sarea_priv->last_wrap++;
210 DRM_DEBUG(" wrap = %d\n", sarea_priv->last_wrap);
211
212 mga_flush_write_combine();
213 MGA_WRITE(MGA_PRIMADDRESS, head | MGA_DMA_GENERAL);
214
215 clear_bit(0, &primary->wrapped);
216 DRM_DEBUG("done.\n");
217 }
218
219 /* ================================================================
220 * Freelist management
221 */
222
223 #define MGA_BUFFER_USED ~0
224 #define MGA_BUFFER_FREE 0
225
226 #if MGA_FREELIST_DEBUG
227 static void mga_freelist_print(drm_device_t * dev)
228 {
229 drm_mga_private_t *dev_priv = dev->dev_private;
230 drm_mga_freelist_t *entry;
231
232 DRM_INFO("\n");
233 DRM_INFO("current dispatch: last=0x%x done=0x%x\n",
234 dev_priv->sarea_priv->last_dispatch,
235 (unsigned int)(MGA_READ(MGA_PRIMADDRESS) -
236 dev_priv->primary->offset));
237 DRM_INFO("current freelist:\n");
238
239 for (entry = dev_priv->head->next; entry; entry = entry->next) {
240 DRM_INFO(" %p idx=%2d age=0x%x 0x%06lx\n",
241 entry, entry->buf->idx, entry->age.head,
242 entry->age.head - dev_priv->primary->offset);
243 }
244 DRM_INFO("\n");
245 }
246 #endif
247
248 static int mga_freelist_init(drm_device_t * dev, drm_mga_private_t * dev_priv)
249 {
250 drm_device_dma_t *dma = dev->dma;
251 drm_buf_t *buf;
252 drm_mga_buf_priv_t *buf_priv;
253 drm_mga_freelist_t *entry;
254 int i;
255 DRM_DEBUG("count=%d\n", dma->buf_count);
256
257 dev_priv->head = drm_alloc(sizeof(drm_mga_freelist_t), DRM_MEM_DRIVER);
258 if (dev_priv->head == NULL)
259 return DRM_ERR(ENOMEM);
260
261 memset(dev_priv->head, 0, sizeof(drm_mga_freelist_t));
262 SET_AGE(&dev_priv->head->age, MGA_BUFFER_USED, 0);
263
264 for (i = 0; i < dma->buf_count; i++) {
265 buf = dma->buflist[i];
266 buf_priv = buf->dev_private;
267
268 entry = drm_alloc(sizeof(drm_mga_freelist_t), DRM_MEM_DRIVER);
269 if (entry == NULL)
270 return DRM_ERR(ENOMEM);
271
272 memset(entry, 0, sizeof(drm_mga_freelist_t));
273
274 entry->next = dev_priv->head->next;
275 entry->prev = dev_priv->head;
276 SET_AGE(&entry->age, MGA_BUFFER_FREE, 0);
277 entry->buf = buf;
278
279 if (dev_priv->head->next != NULL)
280 dev_priv->head->next->prev = entry;
281 if (entry->next == NULL)
282 dev_priv->tail = entry;
283
284 buf_priv->list_entry = entry;
285 buf_priv->discard = 0;
286 buf_priv->dispatched = 0;
287
288 dev_priv->head->next = entry;
289 }
290
291 return 0;
292 }
293
294 static void mga_freelist_cleanup(drm_device_t * dev)
295 {
296 drm_mga_private_t *dev_priv = dev->dev_private;
297 drm_mga_freelist_t *entry;
298 drm_mga_freelist_t *next;
299 DRM_DEBUG("\n");
300
301 entry = dev_priv->head;
302 while (entry) {
303 next = entry->next;
304 drm_free(entry, sizeof(drm_mga_freelist_t), DRM_MEM_DRIVER);
305 entry = next;
306 }
307
308 dev_priv->head = dev_priv->tail = NULL;
309 }
310
311 #if 0
312 /* FIXME: Still needed?
313 */
314 static void mga_freelist_reset(drm_device_t * dev)
315 {
316 drm_device_dma_t *dma = dev->dma;
317 drm_buf_t *buf;
318 drm_mga_buf_priv_t *buf_priv;
319 int i;
320
321 for (i = 0; i < dma->buf_count; i++) {
322 buf = dma->buflist[i];
323 buf_priv = buf->dev_private;
324 SET_AGE(&buf_priv->list_entry->age, MGA_BUFFER_FREE, 0);
325 }
326 }
327 #endif
328
329 static drm_buf_t *mga_freelist_get(drm_device_t * dev)
330 {
331 drm_mga_private_t *dev_priv = dev->dev_private;
332 drm_mga_freelist_t *next;
333 drm_mga_freelist_t *prev;
334 drm_mga_freelist_t *tail = dev_priv->tail;
335 u32 head, wrap;
336 DRM_DEBUG("\n");
337
338 head = MGA_READ(MGA_PRIMADDRESS);
339 wrap = dev_priv->sarea_priv->last_wrap;
340
341 DRM_DEBUG(" tail=0x%06lx %d\n",
342 tail->age.head ?
343 tail->age.head - dev_priv->primary->offset : 0,
344 tail->age.wrap);
345 DRM_DEBUG(" head=0x%06lx %d\n",
346 head - dev_priv->primary->offset, wrap);
347
348 if (TEST_AGE(&tail->age, head, wrap)) {
349 prev = dev_priv->tail->prev;
350 next = dev_priv->tail;
351 prev->next = NULL;
352 next->prev = next->next = NULL;
353 dev_priv->tail = prev;
354 SET_AGE(&next->age, MGA_BUFFER_USED, 0);
355 return next->buf;
356 }
357
358 DRM_DEBUG("returning NULL!\n");
359 return NULL;
360 }
361
362 int mga_freelist_put(drm_device_t * dev, drm_buf_t * buf)
363 {
364 drm_mga_private_t *dev_priv = dev->dev_private;
365 drm_mga_buf_priv_t *buf_priv = buf->dev_private;
366 drm_mga_freelist_t *head, *entry, *prev;
367
368 DRM_DEBUG("age=0x%06lx wrap=%d\n",
369 buf_priv->list_entry->age.head -
370 dev_priv->primary->offset, buf_priv->list_entry->age.wrap);
371
372 entry = buf_priv->list_entry;
373 head = dev_priv->head;
374
375 if (buf_priv->list_entry->age.head == MGA_BUFFER_USED) {
376 SET_AGE(&entry->age, MGA_BUFFER_FREE, 0);
377 prev = dev_priv->tail;
378 prev->next = entry;
379 entry->prev = prev;
380 entry->next = NULL;
381 } else {
382 prev = head->next;
383 head->next = entry;
384 prev->prev = entry;
385 entry->prev = head;
386 entry->next = prev;
387 }
388
389 return 0;
390 }
391
392 /* ================================================================
393 * DMA initialization, cleanup
394 */
395
396 int mga_driver_load(drm_device_t * dev, unsigned long flags)
397 {
398 drm_mga_private_t *dev_priv;
399
400 dev_priv = drm_alloc(sizeof(drm_mga_private_t), DRM_MEM_DRIVER);
401 if (!dev_priv)
402 return DRM_ERR(ENOMEM);
403
404 dev->dev_private = (void *)dev_priv;
405 memset(dev_priv, 0, sizeof(drm_mga_private_t));
406
407 dev_priv->usec_timeout = MGA_DEFAULT_USEC_TIMEOUT;
408 dev_priv->chipset = flags;
409
410 dev_priv->mmio_base = drm_get_resource_start(dev, 1);
411 dev_priv->mmio_size = drm_get_resource_len(dev, 1);
412
413 dev->counters += 3;
414 dev->types[6] = _DRM_STAT_IRQ;
415 dev->types[7] = _DRM_STAT_PRIMARY;
416 dev->types[8] = _DRM_STAT_SECONDARY;
417
418 return 0;
419 }
420
421 #if __OS_HAS_AGP
422 /**
423 * Bootstrap the driver for AGP DMA.
424 *
425 * \todo
426 * Investigate whether there is any benifit to storing the WARP microcode in
427 * AGP memory. If not, the microcode may as well always be put in PCI
428 * memory.
429 *
430 * \todo
431 * This routine needs to set dma_bs->agp_mode to the mode actually configured
432 * in the hardware. Looking just at the Linux AGP driver code, I don't see
433 * an easy way to determine this.
434 *
435 * \sa mga_do_dma_bootstrap, mga_do_pci_dma_bootstrap
436 */
437 static int mga_do_agp_dma_bootstrap(drm_device_t * dev,
438 drm_mga_dma_bootstrap_t * dma_bs)
439 {
440 drm_mga_private_t *const dev_priv =
441 (drm_mga_private_t *) dev->dev_private;
442 unsigned int warp_size = mga_warp_microcode_size(dev_priv);
443 int err;
444 unsigned offset;
445 const unsigned secondary_size = dma_bs->secondary_bin_count
446 * dma_bs->secondary_bin_size;
447 const unsigned agp_size = (dma_bs->agp_size << 20);
448 drm_buf_desc_t req;
449 drm_agp_mode_t mode;
450 drm_agp_info_t info;
451 drm_agp_buffer_t agp_req;
452 drm_agp_binding_t bind_req;
453
454 /* Acquire AGP. */
455 err = drm_agp_acquire(dev);
456 if (err) {
457 DRM_ERROR("Unable to acquire AGP: %d\n", err);
458 return err;
459 }
460
461 err = drm_agp_info(dev, &info);
462 if (err) {
463 DRM_ERROR("Unable to get AGP info: %d\n", err);
464 return err;
465 }
466
467 mode.mode = (info.mode & ~0x07) | dma_bs->agp_mode;
468 err = drm_agp_enable(dev, mode);
469 if (err) {
470 DRM_ERROR("Unable to enable AGP (mode = 0x%lx)\n", mode.mode);
471 return err;
472 }
473
474 /* In addition to the usual AGP mode configuration, the G200 AGP cards
475 * need to have the AGP mode "manually" set.
476 */
477
478 if (dev_priv->chipset == MGA_CARD_TYPE_G200) {
479 if (mode.mode & 0x02) {
480 MGA_WRITE(MGA_AGP_PLL, MGA_AGP2XPLL_ENABLE);
481 } else {
482 MGA_WRITE(MGA_AGP_PLL, MGA_AGP2XPLL_DISABLE);
483 }
484 }
485
486 /* Allocate and bind AGP memory. */
487 agp_req.size = agp_size;
488 agp_req.type = 0;
489 err = drm_agp_alloc(dev, &agp_req);
490 if (err) {
491 dev_priv->agp_size = 0;
492 DRM_ERROR("Unable to allocate %uMB AGP memory\n",
493 dma_bs->agp_size);
494 return err;
495 }
496
497 dev_priv->agp_size = agp_size;
498 dev_priv->agp_handle = agp_req.handle;
499
500 bind_req.handle = agp_req.handle;
501 bind_req.offset = 0;
502 err = drm_agp_bind(dev, &bind_req);
503 if (err) {
504 DRM_ERROR("Unable to bind AGP memory: %d\n", err);
505 return err;
506 }
507
508 /* Make drm_addbufs happy by not trying to create a mapping for less
509 * than a page.
510 */
511 if (warp_size < PAGE_SIZE)
512 warp_size = PAGE_SIZE;
513
514 offset = 0;
515 err = drm_addmap(dev, offset, warp_size,
516 _DRM_AGP, _DRM_READ_ONLY, &dev_priv->warp);
517 if (err) {
518 DRM_ERROR("Unable to map WARP microcode: %d\n", err);
519 return err;
520 }
521
522 offset += warp_size;
523 err = drm_addmap(dev, offset, dma_bs->primary_size,
524 _DRM_AGP, _DRM_READ_ONLY, &dev_priv->primary);
525 if (err) {
526 DRM_ERROR("Unable to map primary DMA region: %d\n", err);
527 return err;
528 }
529
530 offset += dma_bs->primary_size;
531 err = drm_addmap(dev, offset, secondary_size,
532 _DRM_AGP, 0, &dev->agp_buffer_map);
533 if (err) {
534 DRM_ERROR("Unable to map secondary DMA region: %d\n", err);
535 return err;
536 }
537
538 (void)memset(&req, 0, sizeof(req));
539 req.count = dma_bs->secondary_bin_count;
540 req.size = dma_bs->secondary_bin_size;
541 req.flags = _DRM_AGP_BUFFER;
542 req.agp_start = offset;
543
544 err = drm_addbufs_agp(dev, &req);
545 if (err) {
546 DRM_ERROR("Unable to add secondary DMA buffers: %d\n", err);
547 return err;
548 }
549
550 {
551 drm_map_list_t *_entry;
552 unsigned long agp_token = 0;
553
554 list_for_each_entry(_entry, &dev->maplist->head, head) {
555 if (_entry->map == dev->agp_buffer_map)
556 agp_token = _entry->user_token;
557 }
558 if (!agp_token)
559 return -EFAULT;
560
561 dev->agp_buffer_token = agp_token;
562 }
563
564 offset += secondary_size;
565 err = drm_addmap(dev, offset, agp_size - offset,
566 _DRM_AGP, 0, &dev_priv->agp_textures);
567 if (err) {
568 DRM_ERROR("Unable to map AGP texture region %d\n", err);
569 return err;
570 }
571
572 drm_core_ioremap(dev_priv->warp, dev);
573 drm_core_ioremap(dev_priv->primary, dev);
574 drm_core_ioremap(dev->agp_buffer_map, dev);
575
576 if (!dev_priv->warp->handle ||
577 !dev_priv->primary->handle || !dev->agp_buffer_map->handle) {
578 DRM_ERROR("failed to ioremap agp regions! (%p, %p, %p)\n",
579 dev_priv->warp->handle, dev_priv->primary->handle,
580 dev->agp_buffer_map->handle);
581 return DRM_ERR(ENOMEM);
582 }
583
584 dev_priv->dma_access = MGA_PAGPXFER;
585 dev_priv->wagp_enable = MGA_WAGP_ENABLE;
586
587 DRM_INFO("Initialized card for AGP DMA.\n");
588 return 0;
589 }
590 #else
591 static int mga_do_agp_dma_bootstrap(drm_device_t * dev,
592 drm_mga_dma_bootstrap_t * dma_bs)
593 {
594 return -EINVAL;
595 }
596 #endif
597
598 /**
599 * Bootstrap the driver for PCI DMA.
600 *
601 * \todo
602 * The algorithm for decreasing the size of the primary DMA buffer could be
603 * better. The size should be rounded up to the nearest page size, then
604 * decrease the request size by a single page each pass through the loop.
605 *
606 * \todo
607 * Determine whether the maximum address passed to drm_pci_alloc is correct.
608 * The same goes for drm_addbufs_pci.
609 *
610 * \sa mga_do_dma_bootstrap, mga_do_agp_dma_bootstrap
611 */
612 static int mga_do_pci_dma_bootstrap(drm_device_t * dev,
613 drm_mga_dma_bootstrap_t * dma_bs)
614 {
615 drm_mga_private_t *const dev_priv =
616 (drm_mga_private_t *) dev->dev_private;
617 unsigned int warp_size = mga_warp_microcode_size(dev_priv);
618 unsigned int primary_size;
619 unsigned int bin_count;
620 int err;
621 drm_buf_desc_t req;
622
623 if (dev->dma == NULL) {
624 DRM_ERROR("dev->dma is NULL\n");
625 return DRM_ERR(EFAULT);
626 }
627
628 /* Make drm_addbufs happy by not trying to create a mapping for less
629 * than a page.
630 */
631 if (warp_size < PAGE_SIZE)
632 warp_size = PAGE_SIZE;
633
634 /* The proper alignment is 0x100 for this mapping */
635 err = drm_addmap(dev, 0, warp_size, _DRM_CONSISTENT,
636 _DRM_READ_ONLY, &dev_priv->warp);
637 if (err != 0) {
638 DRM_ERROR("Unable to create mapping for WARP microcode: %d\n",
639 err);
640 return err;
641 }
642
643 /* Other than the bottom two bits being used to encode other
644 * information, there don't appear to be any restrictions on the
645 * alignment of the primary or secondary DMA buffers.
646 */
647
648 for (primary_size = dma_bs->primary_size; primary_size != 0;
649 primary_size >>= 1) {
650 /* The proper alignment for this mapping is 0x04 */
651 err = drm_addmap(dev, 0, primary_size, _DRM_CONSISTENT,
652 _DRM_READ_ONLY, &dev_priv->primary);
653 if (!err)
654 break;
655 }
656
657 if (err != 0) {
658 DRM_ERROR("Unable to allocate primary DMA region: %d\n", err);
659 return DRM_ERR(ENOMEM);
660 }
661
662 if (dev_priv->primary->size != dma_bs->primary_size) {
663 DRM_INFO("Primary DMA buffer size reduced from %u to %u.\n",
664 dma_bs->primary_size,
665 (unsigned)dev_priv->primary->size);
666 dma_bs->primary_size = dev_priv->primary->size;
667 }
668
669 for (bin_count = dma_bs->secondary_bin_count; bin_count > 0;
670 bin_count--) {
671 (void)memset(&req, 0, sizeof(req));
672 req.count = bin_count;
673 req.size = dma_bs->secondary_bin_size;
674
675 err = drm_addbufs_pci(dev, &req);
676 if (!err) {
677 break;
678 }
679 }
680
681 if (bin_count == 0) {
682 DRM_ERROR("Unable to add secondary DMA buffers: %d\n", err);
683 return err;
684 }
685
686 if (bin_count != dma_bs->secondary_bin_count) {
687 DRM_INFO("Secondary PCI DMA buffer bin count reduced from %u "
688 "to %u.\n", dma_bs->secondary_bin_count, bin_count);
689
690 dma_bs->secondary_bin_count = bin_count;
691 }
692
693 dev_priv->dma_access = 0;
694 dev_priv->wagp_enable = 0;
695
696 dma_bs->agp_mode = 0;
697
698 DRM_INFO("Initialized card for PCI DMA.\n");
699 return 0;
700 }
701
702 static int mga_do_dma_bootstrap(drm_device_t * dev,
703 drm_mga_dma_bootstrap_t * dma_bs)
704 {
705 const int is_agp = (dma_bs->agp_mode != 0) && drm_device_is_agp(dev);
706 int err;
707 drm_mga_private_t *const dev_priv =
708 (drm_mga_private_t *) dev->dev_private;
709
710 dev_priv->used_new_dma_init = 1;
711
712 /* The first steps are the same for both PCI and AGP based DMA. Map
713 * the cards MMIO registers and map a status page.
714 */
715 err = drm_addmap(dev, dev_priv->mmio_base, dev_priv->mmio_size,
716 _DRM_REGISTERS, _DRM_READ_ONLY, &dev_priv->mmio);
717 if (err) {
718 DRM_ERROR("Unable to map MMIO region: %d\n", err);
719 return err;
720 }
721
722 err = drm_addmap(dev, 0, SAREA_MAX, _DRM_SHM,
723 _DRM_READ_ONLY | _DRM_LOCKED | _DRM_KERNEL,
724 &dev_priv->status);
725 if (err) {
726 DRM_ERROR("Unable to map status region: %d\n", err);
727 return err;
728 }
729
730 /* The DMA initialization procedure is slightly different for PCI and
731 * AGP cards. AGP cards just allocate a large block of AGP memory and
732 * carve off portions of it for internal uses. The remaining memory
733 * is returned to user-mode to be used for AGP textures.
734 */
735 if (is_agp) {
736 err = mga_do_agp_dma_bootstrap(dev, dma_bs);
737 }
738
739 /* If we attempted to initialize the card for AGP DMA but failed,
740 * clean-up any mess that may have been created.
741 */
742
743 if (err) {
744 mga_do_cleanup_dma(dev, MINIMAL_CLEANUP);
745 }
746
747 /* Not only do we want to try and initialized PCI cards for PCI DMA,
748 * but we also try to initialized AGP cards that could not be
749 * initialized for AGP DMA. This covers the case where we have an AGP
750 * card in a system with an unsupported AGP chipset. In that case the
751 * card will be detected as AGP, but we won't be able to allocate any
752 * AGP memory, etc.
753 */
754
755 if (!is_agp || err) {
756 err = mga_do_pci_dma_bootstrap(dev, dma_bs);
757 }
758
759 return err;
760 }
761
762 int mga_dma_bootstrap(DRM_IOCTL_ARGS)
763 {
764 DRM_DEVICE;
765 drm_mga_dma_bootstrap_t bootstrap;
766 int err;
767 static const int modes[] = { 0, 1, 2, 2, 4, 4, 4, 4 };
768 const drm_mga_private_t *const dev_priv =
769 (drm_mga_private_t *) dev->dev_private;
770
771 DRM_COPY_FROM_USER_IOCTL(bootstrap,
772 (drm_mga_dma_bootstrap_t __user *) data,
773 sizeof(bootstrap));
774
775 err = mga_do_dma_bootstrap(dev, &bootstrap);
776 if (err) {
777 mga_do_cleanup_dma(dev, FULL_CLEANUP);
778 return err;
779 }
780
781 if (dev_priv->agp_textures != NULL) {
782 bootstrap.texture_handle = dev_priv->agp_textures->offset;
783 bootstrap.texture_size = dev_priv->agp_textures->size;
784 } else {
785 bootstrap.texture_handle = 0;
786 bootstrap.texture_size = 0;
787 }
788
789 bootstrap.agp_mode = modes[bootstrap.agp_mode & 0x07];
790 DRM_COPY_TO_USER_IOCTL((drm_mga_dma_bootstrap_t __user *)data,
791 bootstrap, sizeof(bootstrap));
792
793 return err;
794 }
795
796 static int mga_do_init_dma(drm_device_t * dev, drm_mga_init_t * init)
797 {
798 drm_mga_private_t *dev_priv;
799 int ret;
800 DRM_DEBUG("\n");
801
802 dev_priv = dev->dev_private;
803
804 if (init->sgram) {
805 dev_priv->clear_cmd = MGA_DWGCTL_CLEAR | MGA_ATYPE_BLK;
806 } else {
807 dev_priv->clear_cmd = MGA_DWGCTL_CLEAR | MGA_ATYPE_RSTR;
808 }
809 dev_priv->maccess = init->maccess;
810
811 dev_priv->fb_cpp = init->fb_cpp;
812 dev_priv->front_offset = init->front_offset;
813 dev_priv->front_pitch = init->front_pitch;
814 dev_priv->back_offset = init->back_offset;
815 dev_priv->back_pitch = init->back_pitch;
816
817 dev_priv->depth_cpp = init->depth_cpp;
818 dev_priv->depth_offset = init->depth_offset;
819 dev_priv->depth_pitch = init->depth_pitch;
820
821 /* FIXME: Need to support AGP textures...
822 */
823 dev_priv->texture_offset = init->texture_offset[0];
824 dev_priv->texture_size = init->texture_size[0];
825
826 DRM_GETSAREA();
827
828 if (!dev_priv->sarea) {
829 DRM_ERROR("failed to find sarea!\n");
830 return DRM_ERR(EINVAL);
831 }
832
833 if (!dev_priv->used_new_dma_init) {
834
835 dev_priv->dma_access = MGA_PAGPXFER;
836 dev_priv->wagp_enable = MGA_WAGP_ENABLE;
837
838 dev_priv->status = drm_core_findmap(dev, init->status_offset);
839 if (!dev_priv->status) {
840 DRM_ERROR("failed to find status page!\n");
841 return DRM_ERR(EINVAL);
842 }
843 dev_priv->mmio = drm_core_findmap(dev, init->mmio_offset);
844 if (!dev_priv->mmio) {
845 DRM_ERROR("failed to find mmio region!\n");
846 return DRM_ERR(EINVAL);
847 }
848 dev_priv->warp = drm_core_findmap(dev, init->warp_offset);
849 if (!dev_priv->warp) {
850 DRM_ERROR("failed to find warp microcode region!\n");
851 return DRM_ERR(EINVAL);
852 }
853 dev_priv->primary = drm_core_findmap(dev, init->primary_offset);
854 if (!dev_priv->primary) {
855 DRM_ERROR("failed to find primary dma region!\n");
856 return DRM_ERR(EINVAL);
857 }
858 dev->agp_buffer_token = init->buffers_offset;
859 dev->agp_buffer_map =
860 drm_core_findmap(dev, init->buffers_offset);
861 if (!dev->agp_buffer_map) {
862 DRM_ERROR("failed to find dma buffer region!\n");
863 return DRM_ERR(EINVAL);
864 }
865
866 drm_core_ioremap(dev_priv->warp, dev);
867 drm_core_ioremap(dev_priv->primary, dev);
868 drm_core_ioremap(dev->agp_buffer_map, dev);
869 }
870
871 dev_priv->sarea_priv =
872 (drm_mga_sarea_t *) ((u8 *) dev_priv->sarea->handle +
873 init->sarea_priv_offset);
874
875 if (!dev_priv->warp->handle ||
876 !dev_priv->primary->handle ||
877 ((dev_priv->dma_access != 0) &&
878 ((dev->agp_buffer_map == NULL) ||
879 (dev->agp_buffer_map->handle == NULL)))) {
880 DRM_ERROR("failed to ioremap agp regions!\n");
881 return DRM_ERR(ENOMEM);
882 }
883
884 ret = mga_warp_install_microcode(dev_priv);
885 if (ret < 0) {
886 DRM_ERROR("failed to install WARP ucode!: %d\n", ret);
887 return ret;
888 }
889
890 ret = mga_warp_init(dev_priv);
891 if (ret < 0) {
892 DRM_ERROR("failed to init WARP engine!: %d\n", ret);
893 return ret;
894 }
895
896 dev_priv->prim.status = (u32 *) dev_priv->status->handle;
897
898 mga_do_wait_for_idle(dev_priv);
899
900 /* Init the primary DMA registers.
901 */
902 MGA_WRITE(MGA_PRIMADDRESS, dev_priv->primary->offset | MGA_DMA_GENERAL);
903 #if 0
904 MGA_WRITE(MGA_PRIMPTR, virt_to_bus((void *)dev_priv->prim.status) | MGA_PRIMPTREN0 | /* Soft trap, SECEND, SETUPEND */
905 MGA_PRIMPTREN1); /* DWGSYNC */
906 #endif
907
908 dev_priv->prim.start = (u8 *) dev_priv->primary->handle;
909 dev_priv->prim.end = ((u8 *) dev_priv->primary->handle
910 + dev_priv->primary->size);
911 dev_priv->prim.size = dev_priv->primary->size;
912
913 dev_priv->prim.tail = 0;
914 dev_priv->prim.space = dev_priv->prim.size;
915 dev_priv->prim.wrapped = 0;
916
917 dev_priv->prim.last_flush = 0;
918 dev_priv->prim.last_wrap = 0;
919
920 dev_priv->prim.high_mark = 256 * DMA_BLOCK_SIZE;
921
922 dev_priv->prim.status[0] = dev_priv->primary->offset;
923 dev_priv->prim.status[1] = 0;
924
925 dev_priv->sarea_priv->last_wrap = 0;
926 dev_priv->sarea_priv->last_frame.head = 0;
927 dev_priv->sarea_priv->last_frame.wrap = 0;
928
929 if (mga_freelist_init(dev, dev_priv) < 0) {
930 DRM_ERROR("could not initialize freelist\n");
931 return DRM_ERR(ENOMEM);
932 }
933
934 return 0;
935 }
936
937 static int mga_do_cleanup_dma(drm_device_t *dev, int full_cleanup)
938 {
939 int err = 0;
940 DRM_DEBUG("\n");
941
942 /* Make sure interrupts are disabled here because the uninstall ioctl
943 * may not have been called from userspace and after dev_private
944 * is freed, it's too late.
945 */
946 if (dev->irq_enabled)
947 drm_irq_uninstall(dev);
948
949 if (dev->dev_private) {
950 drm_mga_private_t *dev_priv = dev->dev_private;
951
952 if ((dev_priv->warp != NULL)
953 && (dev_priv->warp->type != _DRM_CONSISTENT))
954 drm_core_ioremapfree(dev_priv->warp, dev);
955
956 if ((dev_priv->primary != NULL)
957 && (dev_priv->primary->type != _DRM_CONSISTENT))
958 drm_core_ioremapfree(dev_priv->primary, dev);
959
960 if (dev->agp_buffer_map != NULL)
961 drm_core_ioremapfree(dev->agp_buffer_map, dev);
962
963 if (dev_priv->used_new_dma_init) {
964 #if __OS_HAS_AGP
965 if (dev_priv->agp_handle != 0) {
966 drm_agp_binding_t unbind_req;
967 drm_agp_buffer_t free_req;
968
969 unbind_req.handle = dev_priv->agp_handle;
970 drm_agp_unbind(dev, &unbind_req);
971
972 free_req.handle = dev_priv->agp_handle;
973 drm_agp_free(dev, &free_req);
974
975 dev_priv->agp_textures = NULL;
976 dev_priv->agp_size = 0;
977 dev_priv->agp_handle = 0;
978 }
979
980 if ((dev->agp != NULL) && dev->agp->acquired) {
981 err = drm_agp_release(dev);
982 }
983 #endif
984 }
985
986 dev_priv->warp = NULL;
987 dev_priv->primary = NULL;
988 dev_priv->sarea = NULL;
989 dev_priv->sarea_priv = NULL;
990 dev->agp_buffer_map = NULL;
991
992 if (full_cleanup) {
993 dev_priv->mmio = NULL;
994 dev_priv->status = NULL;
995 dev_priv->used_new_dma_init = 0;
996 }
997
998 memset(&dev_priv->prim, 0, sizeof(dev_priv->prim));
999 dev_priv->warp_pipe = 0;
1000 memset(dev_priv->warp_pipe_phys, 0,
1001 sizeof(dev_priv->warp_pipe_phys));
1002
1003 if (dev_priv->head != NULL) {
1004 mga_freelist_cleanup(dev);
1005 }
1006 }
1007
1008 return 0;
1009 }
1010
1011 int mga_dma_init(DRM_IOCTL_ARGS)
1012 {
1013 DRM_DEVICE;
1014 drm_mga_init_t init;
1015 int err;
1016
1017 LOCK_TEST_WITH_RETURN(dev, filp);
1018
1019 DRM_COPY_FROM_USER_IOCTL(init, (drm_mga_init_t __user *) data,
1020 sizeof(init));
1021
1022 switch (init.func) {
1023 case MGA_INIT_DMA:
1024 err = mga_do_init_dma(dev, &init);
1025 if (err) {
1026 (void)mga_do_cleanup_dma(dev, FULL_CLEANUP);
1027 }
1028 return err;
1029 case MGA_CLEANUP_DMA:
1030 return mga_do_cleanup_dma(dev, FULL_CLEANUP);
1031 }
1032
1033 return DRM_ERR(EINVAL);
1034 }
1035
1036 /* ================================================================
1037 * Primary DMA stream management
1038 */
1039
1040 int mga_dma_flush(DRM_IOCTL_ARGS)
1041 {
1042 DRM_DEVICE;
1043 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
1044 drm_lock_t lock;
1045
1046 LOCK_TEST_WITH_RETURN(dev, filp);
1047
1048 DRM_COPY_FROM_USER_IOCTL(lock, (drm_lock_t __user *) data,
1049 sizeof(lock));
1050
1051 DRM_DEBUG("%s%s%s\n",
1052 (lock.flags & _DRM_LOCK_FLUSH) ? "flush, " : "",
1053 (lock.flags & _DRM_LOCK_FLUSH_ALL) ? "flush all, " : "",
1054 (lock.flags & _DRM_LOCK_QUIESCENT) ? "idle, " : "");
1055
1056 WRAP_WAIT_WITH_RETURN(dev_priv);
1057
1058 if (lock.flags & (_DRM_LOCK_FLUSH | _DRM_LOCK_FLUSH_ALL)) {
1059 mga_do_dma_flush(dev_priv);
1060 }
1061
1062 if (lock.flags & _DRM_LOCK_QUIESCENT) {
1063 #if MGA_DMA_DEBUG
1064 int ret = mga_do_wait_for_idle(dev_priv);
1065 if (ret < 0)
1066 DRM_INFO("%s: -EBUSY\n", __FUNCTION__);
1067 return ret;
1068 #else
1069 return mga_do_wait_for_idle(dev_priv);
1070 #endif
1071 } else {
1072 return 0;
1073 }
1074 }
1075
1076 int mga_dma_reset(DRM_IOCTL_ARGS)
1077 {
1078 DRM_DEVICE;
1079 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
1080
1081 LOCK_TEST_WITH_RETURN(dev, filp);
1082
1083 return mga_do_dma_reset(dev_priv);
1084 }
1085
1086 /* ================================================================
1087 * DMA buffer management
1088 */
1089
1090 static int mga_dma_get_buffers(DRMFILE filp, drm_device_t * dev, drm_dma_t * d)
1091 {
1092 drm_buf_t *buf;
1093 int i;
1094
1095 for (i = d->granted_count; i < d->request_count; i++) {
1096 buf = mga_freelist_get(dev);
1097 if (!buf)
1098 return DRM_ERR(EAGAIN);
1099
1100 buf->filp = filp;
1101
1102 if (DRM_COPY_TO_USER(&d->request_indices[i],
1103 &buf->idx, sizeof(buf->idx)))
1104 return DRM_ERR(EFAULT);
1105 if (DRM_COPY_TO_USER(&d->request_sizes[i],
1106 &buf->total, sizeof(buf->total)))
1107 return DRM_ERR(EFAULT);
1108
1109 d->granted_count++;
1110 }
1111 return 0;
1112 }
1113
1114 int mga_dma_buffers(DRM_IOCTL_ARGS)
1115 {
1116 DRM_DEVICE;
1117 drm_device_dma_t *dma = dev->dma;
1118 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
1119 drm_dma_t __user *argp = (void __user *)data;
1120 drm_dma_t d;
1121 int ret = 0;
1122
1123 LOCK_TEST_WITH_RETURN(dev, filp);
1124
1125 DRM_COPY_FROM_USER_IOCTL(d, argp, sizeof(d));
1126
1127 /* Please don't send us buffers.
1128 */
1129 if (d.send_count != 0) {
1130 DRM_ERROR("Process %d trying to send %d buffers via drmDMA\n",
1131 DRM_CURRENTPID, d.send_count);
1132 return DRM_ERR(EINVAL);
1133 }
1134
1135 /* We'll send you buffers.
1136 */
1137 if (d.request_count < 0 || d.request_count > dma->buf_count) {
1138 DRM_ERROR("Process %d trying to get %d buffers (of %d max)\n",
1139 DRM_CURRENTPID, d.request_count, dma->buf_count);
1140 return DRM_ERR(EINVAL);
1141 }
1142
1143 WRAP_TEST_WITH_RETURN(dev_priv);
1144
1145 d.granted_count = 0;
1146
1147 if (d.request_count) {
1148 ret = mga_dma_get_buffers(filp, dev, &d);
1149 }
1150
1151 DRM_COPY_TO_USER_IOCTL(argp, d, sizeof(d));
1152
1153 return ret;
1154 }
1155
1156 /**
1157 * Called just before the module is unloaded.
1158 */
1159 int mga_driver_unload(drm_device_t * dev)
1160 {
1161 drm_free(dev->dev_private, sizeof(drm_mga_private_t), DRM_MEM_DRIVER);
1162 dev->dev_private = NULL;
1163
1164 return 0;
1165 }
1166
1167 /**
1168 * Called when the last opener of the device is closed.
1169 */
1170 void mga_driver_lastclose(drm_device_t * dev)
1171 {
1172 mga_do_cleanup_dma(dev, FULL_CLEANUP);
1173 }
1174
1175 int mga_driver_dma_quiescent(drm_device_t * dev)
1176 {
1177 drm_mga_private_t *dev_priv = dev->dev_private;
1178 return mga_do_wait_for_idle(dev_priv);
1179 }
WRT350N Kernel Patches