aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/video/omap2/vram.c
blob: b266ffae0bdea5f23d4d8ca4fa007ed9166f605e (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
/*
 * VRAM manager for OMAP
 *
 * Copyright (C) 2009 Nokia Corporation
 * Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

/*#define DEBUG*/

#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/list.h>
#include <linux/seq_file.h>
#include <linux/bootmem.h>
#include <linux/completion.h>
#include <linux/debugfs.h>
#include <linux/jiffies.h>
#include <linux/module.h>

#include <asm/setup.h>

#include <plat/sram.h>
#include <plat/vram.h>
#include <plat/dma.h>

#ifdef DEBUG
#define DBG(format, ...) pr_debug("VRAM: " format, ## __VA_ARGS__)
#else
#define DBG(format, ...)
#endif

#define OMAP2_SRAM_START		0x40200000
/* Maximum size, in reality this is smaller if SRAM is partially locked. */
#define OMAP2_SRAM_SIZE			0xa0000		/* 640k */

/* postponed regions are used to temporarily store region information at boot
 * time when we cannot yet allocate the region list */
#define MAX_POSTPONED_REGIONS 10

static bool vram_initialized;
static int postponed_cnt;
static struct {
	unsigned long paddr;
	size_t size;
} postponed_regions[MAX_POSTPONED_REGIONS];

struct vram_alloc {
	struct list_head list;
	unsigned long paddr;
	unsigned pages;
};

struct vram_region {
	struct list_head list;
	struct list_head alloc_list;
	unsigned long paddr;
	unsigned pages;
};

static DEFINE_MUTEX(region_mutex);
static LIST_HEAD(region_list);

static inline int region_mem_type(unsigned long paddr)
{
	if (paddr >= OMAP2_SRAM_START &&
	    paddr < OMAP2_SRAM_START + OMAP2_SRAM_SIZE)
		return OMAP_VRAM_MEMTYPE_SRAM;
	else
		return OMAP_VRAM_MEMTYPE_SDRAM;
}

static struct vram_region *omap_vram_create_region(unsigned long paddr,
		unsigned pages)
{
	struct vram_region *rm;

	rm = kzalloc(sizeof(*rm), GFP_KERNEL);

	if (rm) {
		INIT_LIST_HEAD(&rm->alloc_list);
		rm->paddr = paddr;
		rm->pages = pages;
	}

	return rm;
}

#if 0
static void omap_vram_free_region(struct vram_region *vr)
{
	list_del(&vr->list);
	kfree(vr);
}
#endif

static struct vram_alloc *omap_vram_create_allocation(struct vram_region *vr,
		unsigned long paddr, unsigned pages)
{
	struct vram_alloc *va;
	struct vram_alloc *new;

	new = kzalloc(sizeof(*va), GFP_KERNEL);

	if (!new)
		return NULL;

	new->paddr = paddr;
	new->pages = pages;

	list_for_each_entry(va, &vr->alloc_list, list) {
		if (va->paddr > new->paddr)
			break;
	}

	list_add_tail(&new->list, &va->list);

	return new;
}

static void omap_vram_free_allocation(struct vram_alloc *va)
{
	list_del(&va->list);
	kfree(va);
}

int omap_vram_add_region(unsigned long paddr, size_t size)
{
	struct vram_region *rm;
	unsigned pages;

	if (vram_initialized) {
		DBG("adding region paddr %08lx size %d\n",
				paddr, size);

		size &= PAGE_MASK;
		pages = size >> PAGE_SHIFT;

		rm = omap_vram_create_region(paddr, pages);
		if (rm == NULL)
			return -ENOMEM;

		list_add(&rm->list, &region_list);
	} else {
		if (postponed_cnt == MAX_POSTPONED_REGIONS)
			return -ENOMEM;

		postponed_regions[postponed_cnt].paddr = paddr;
		postponed_regions[postponed_cnt].size = size;

		++postponed_cnt;
	}
	return 0;
}

int omap_vram_free(unsigned long paddr, size_t size)
{
	struct vram_region *rm;
	struct vram_alloc *alloc;
	unsigned start, end;

	DBG("free mem paddr %08lx size %d\n", paddr, size);

	size = PAGE_ALIGN(size);

	mutex_lock(&region_mutex);

	list_for_each_entry(rm, &region_list, list) {
		list_for_each_entry(alloc, &rm->alloc_list, list) {
			start = alloc->paddr;
			end = alloc->paddr + (alloc->pages >> PAGE_SHIFT);

			if (start >= paddr && end < paddr + size)
				goto found;
		}
	}

	mutex_unlock(&region_mutex);
	return -EINVAL;

found:
	omap_vram_free_allocation(alloc);

	mutex_unlock(&region_mutex);
	return 0;
}
EXPORT_SYMBOL(omap_vram_free);

static int _omap_vram_reserve(unsigned long paddr, unsigned pages)
{
	struct vram_region *rm;
	struct vram_alloc *alloc;
	size_t size;

	size = pages << PAGE_SHIFT;

	list_for_each_entry(rm, &region_list, list) {
		unsigned long start, end;

		DBG("checking region %lx %d\n", rm->paddr, rm->pages);

		if (region_mem_type(rm->paddr) != region_mem_type(paddr))
			continue;

		start = rm->paddr;
		end = start + (rm->pages << PAGE_SHIFT) - 1;
		if (start > paddr || end < paddr + size - 1)
			continue;

		DBG("block ok, checking allocs\n");

		list_for_each_entry(alloc, &rm->alloc_list, list) {
			end = alloc->paddr - 1;

			if (start <= paddr && end >= paddr + size - 1)
				goto found;

			start = alloc->paddr + (alloc->pages << PAGE_SHIFT);
		}

		end = rm->paddr + (rm->pages << PAGE_SHIFT) - 1;

		if (!(start <= paddr && end >= paddr + size - 1))
			continue;
found:
		DBG("found area start %lx, end %lx\n", start, end);

		if (omap_vram_create_allocation(rm, paddr, pages) == NULL)
			return -ENOMEM;

		return 0;
	}

	return -ENOMEM;
}

int omap_vram_reserve(unsigned long paddr, size_t size)
{
	unsigned pages;
	int r;

	DBG("reserve mem paddr %08lx size %d\n", paddr, size);

	size = PAGE_ALIGN(size);
	pages = size >> PAGE_SHIFT;

	mutex_lock(&region_mutex);

	r = _omap_vram_reserve(paddr, pages);

	mutex_unlock(&region_mutex);

	return r;
}
EXPORT_SYMBOL(omap_vram_reserve);

static void _omap_vram_dma_cb(int lch, u16 ch_status, void *data)
{
	struct completion *compl = data;
	complete(compl);
}

static int _omap_vram_clear(u32 paddr, unsigned pages)
{
	struct completion compl;
	unsigned elem_count;
	unsigned frame_count;
	int r;
	int lch;

	init_completion(&compl);

	r = omap_request_dma(OMAP_DMA_NO_DEVICE, "VRAM DMA",
			_omap_vram_dma_cb,
			&compl, &lch);
	if (r) {
		pr_err("VRAM: request_dma failed for memory clear\n");
		return -EBUSY;
	}

	elem_count = pages * PAGE_SIZE / 4;
	frame_count = 1;

	omap_set_dma_transfer_params(lch, OMAP_DMA_DATA_TYPE_S32,
			elem_count, frame_count,
			OMAP_DMA_SYNC_ELEMENT,
			0, 0);

	omap_set_dma_dest_params(lch, 0, OMAP_DMA_AMODE_POST_INC,
			paddr, 0, 0);

	omap_set_dma_color_mode(lch, OMAP_DMA_CONSTANT_FILL, 0x000000);

	omap_start_dma(lch);

	if (wait_for_completion_timeout(&compl, msecs_to_jiffies(1000)) == 0) {
		omap_stop_dma(lch);
		pr_err("VRAM: dma timeout while clearing memory\n");
		r = -EIO;
		goto err;
	}

	r = 0;
err:
	omap_free_dma(lch);

	return r;
}

static int _omap_vram_alloc(int mtype, unsigned pages, unsigned long *paddr)
{
	struct vram_region *rm;
	struct vram_alloc *alloc;

	list_for_each_entry(rm, &region_list, list) {
		unsigned long start, end;

		DBG("checking region %lx %d\n", rm->paddr, rm->pages);

		if (region_mem_type(rm->paddr) != mtype)
			continue;

		start = rm->paddr;

		list_for_each_entry(alloc, &rm->alloc_list, list) {
			end = alloc->paddr;

			if (end - start >= pages << PAGE_SHIFT)
				goto found;

			start = alloc->paddr + (alloc->pages << PAGE_SHIFT);
		}

		end = rm->paddr + (rm->pages << PAGE_SHIFT);
found:
		if (end - start < pages << PAGE_SHIFT)
			continue;

		DBG("found %lx, end %lx\n", start, end);

		alloc = omap_vram_create_allocation(rm, start, pages);
		if (alloc == NULL)
			return -ENOMEM;

		*paddr = start;

		_omap_vram_clear(start, pages);

		return 0;
	}

	return -ENOMEM;
}

int omap_vram_alloc(int mtype, size_t size, unsigned long *paddr)
{
	unsigned pages;
	int r;

	BUG_ON(mtype > OMAP_VRAM_MEMTYPE_MAX || !size);

	DBG("alloc mem type %d size %d\n", mtype, size);

	size = PAGE_ALIGN(size);
	pages = size >> PAGE_SHIFT;

	mutex_lock(&region_mutex);

	r = _omap_vram_alloc(mtype, pages, paddr);

	mutex_unlock(&region_mutex);

	return r;
}
EXPORT_SYMBOL(omap_vram_alloc);

void omap_vram_get_info(unsigned long *vram,
		unsigned long *free_vram,
		unsigned long *largest_free_block)
{
	struct vram_region *vr;
	struct vram_alloc *va;

	*vram = 0;
	*free_vram = 0;
	*largest_free_block = 0;

	mutex_lock(&region_mutex);

	list_for_each_entry(vr, &region_list, list) {
		unsigned free;
		unsigned long pa;

		pa = vr->paddr;
		*vram += vr->pages << PAGE_SHIFT;

		list_for_each_entry(va, &vr->alloc_list, list) {
			free = va->paddr - pa;
			*free_vram += free;
			if (free > *largest_free_block)
				*largest_free_block = free;
			pa = va->paddr + (va->pages << PAGE_SHIFT);
		}

		free = vr->paddr + (vr->pages << PAGE_SHIFT) - pa;
		*free_vram += free;
		if (free > *largest_free_block)
			*largest_free_block = free;
	}

	mutex_unlock(&region_mutex);
}
EXPORT_SYMBOL(omap_vram_get_info);

#if defined(CONFIG_DEBUG_FS)
static int vram_debug_show(struct seq_file *s, void *unused)
{
	struct vram_region *vr;
	struct vram_alloc *va;
	unsigned size;

	mutex_lock(&region_mutex);

	list_for_each_entry(vr, &region_list, list) {
		size = vr->pages << PAGE_SHIFT;
		seq_printf(s, "%08lx-%08lx (%d bytes)\n",
				vr->paddr, vr->paddr + size - 1,
				size);

		list_for_each_entry(va, &vr->alloc_list, list) {
			size = va->pages << PAGE_SHIFT;
			seq_printf(s, "    %08lx-%08lx (%d bytes)\n",
					va->paddr, va->paddr + size - 1,
					size);
		}
	}

	mutex_unlock(&region_mutex);

	return 0;
}

static int vram_debug_open(struct inode *inode, struct file *file)
{
	return single_open(file, vram_debug_show, inode->i_private);
}

static const struct file_operations vram_debug_fops = {
	.open           = vram_debug_open,
	.read           = seq_read,
	.llseek         = seq_lseek,
	.release        = single_release,
};

static int __init omap_vram_create_debugfs(void)
{
	struct dentry *d;

	d = debugfs_create_file("vram", S_IRUGO, NULL,
			NULL, &vram_debug_fops);
	if (IS_ERR(d))
		return PTR_ERR(d);

	return 0;
}
#endif

static __init int omap_vram_init(void)
{
	int i;

	vram_initialized = 1;

	for (i = 0; i < postponed_cnt; i++)
		omap_vram_add_region(postponed_regions[i].paddr,
				postponed_regions[i].size);

#ifdef CONFIG_DEBUG_FS
	if (omap_vram_create_debugfs())
		pr_err("VRAM: Failed to create debugfs file\n");
#endif

	return 0;
}

arch_initcall(omap_vram_init);

/* boottime vram alloc stuff */

/* set from board file */
static u32 omap_vram_sram_start __initdata;
static u32 omap_vram_sram_size __initdata;

/* set from board file */
static u32 omap_vram_sdram_start __initdata;
static u32 omap_vram_sdram_size __initdata;

/* set from kernel cmdline */
static u32 omap_vram_def_sdram_size __initdata;
static u32 omap_vram_def_sdram_start __initdata;

static int __init omap_vram_early_vram(char *p)
{
	omap_vram_def_sdram_size = memparse(p, &p);
	if (*p == ',')
		omap_vram_def_sdram_start = simple_strtoul(p + 1, &p, 16);
	return 0;
}
early_param("vram", omap_vram_early_vram);

/*
 * Called from map_io. We need to call to this early enough so that we
 * can reserve the fixed SDRAM regions before VM could get hold of them.
 */
void __init omap_vram_reserve_sdram(void)
{
	struct bootmem_data	*bdata;
	unsigned long		sdram_start, sdram_size;
	u32 paddr;
	u32 size = 0;

	/* cmdline arg overrides the board file definition */
	if (omap_vram_def_sdram_size) {
		size = omap_vram_def_sdram_size;
		paddr = omap_vram_def_sdram_start;
	}

	if (!size) {
		size = omap_vram_sdram_size;
		paddr = omap_vram_sdram_start;
	}

#ifdef CONFIG_OMAP2_VRAM_SIZE
	if (!size) {
		size = CONFIG_OMAP2_VRAM_SIZE * 1024 * 1024;
		paddr = 0;
	}
#endif

	if (!size)
		return;

	size = PAGE_ALIGN(size);

	bdata = NODE_DATA(0)->bdata;
	sdram_start = bdata->node_min_pfn << PAGE_SHIFT;
	sdram_size = (bdata->node_low_pfn << PAGE_SHIFT) - sdram_start;

	if (paddr) {
		if ((paddr & ~PAGE_MASK) || paddr < sdram_start ||
				paddr + size > sdram_start + sdram_size) {
			pr_err("Illegal SDRAM region for VRAM\n");
			return;
		}

		if (reserve_bootmem(paddr, size, BOOTMEM_EXCLUSIVE) < 0) {
			pr_err("FB: failed to reserve VRAM\n");
			return;
		}
	} else {
		if (size > sdram_size) {
			pr_err("Illegal SDRAM size for VRAM\n");
			return;
		}

		paddr = virt_to_phys(alloc_bootmem_pages(size));
		BUG_ON(paddr & ~PAGE_MASK);
	}

	omap_vram_add_region(paddr, size);

	pr_info("Reserving %u bytes SDRAM for VRAM\n", size);
}

/*
 * Called at sram init time, before anything is pushed to the SRAM stack.
 * Because of the stack scheme, we will allocate everything from the
 * start of the lowest address region to the end of SRAM. This will also
 * include padding for page alignment and possible holes between regions.
 *
 * As opposed to the SDRAM case, we'll also do any dynamic allocations at
 * this point, since the driver built as a module would have problem with
 * freeing / reallocating the regions.
 */
unsigned long __init omap_vram_reserve_sram(unsigned long sram_pstart,
				  unsigned long sram_vstart,
				  unsigned long sram_size,
				  unsigned long pstart_avail,
				  unsigned long size_avail)
{
	unsigned long			pend_avail;
	unsigned long			reserved;
	u32 paddr;
	u32 size;

	paddr = omap_vram_sram_start;
	size = omap_vram_sram_size;

	if (!size)
		return 0;

	reserved = 0;
	pend_avail = pstart_avail + size_avail;

	if (!paddr) {
		/* Dynamic allocation */
		if ((size_avail & PAGE_MASK) < size) {
			pr_err("Not enough SRAM for VRAM\n");
			return 0;
		}
		size_avail = (size_avail - size) & PAGE_MASK;
		paddr = pstart_avail + size_avail;
	}

	if (paddr < sram_pstart ||
			paddr + size > sram_pstart + sram_size) {
		pr_err("Illegal SRAM region for VRAM\n");
		return 0;
	}

	/* Reserve everything above the start of the region. */
	if (pend_avail - paddr > reserved)
		reserved = pend_avail - paddr;
	size_avail = pend_avail - reserved - pstart_avail;

	omap_vram_add_region(paddr, size);

	if (reserved)
		pr_info("Reserving %lu bytes SRAM for VRAM\n", reserved);

	return reserved;
}

void __init omap_vram_set_sdram_vram(u32 size, u32 start)
{
	omap_vram_sdram_start = start;
	omap_vram_sdram_size = size;
}

void __init omap_vram_set_sram_vram(u32 size, u32 start)
{
	omap_vram_sram_start = start;
	omap_vram_sram_size = size;
}