summaryrefslogtreecommitdiffstats
path: root/arch/arm/plat-omap/fb.c
blob: bb78c1532faed1297e0ad79f483baf15ec3d361d (plain)
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
/*
 * File: arch/arm/plat-omap/fb.c
 *
 * Framebuffer device registration for TI OMAP platforms
 *
 * Copyright (C) 2006 Nokia Corporation
 * Author: Imre Deak <imre.deak@nokia.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 *
 * 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.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/memblock.h>
#include <linux/io.h>
#include <linux/omapfb.h>

#include <mach/hardware.h>
#include <asm/mach/map.h>

#include <plat/board.h>
#include <plat/sram.h>

#include "fb.h"

#if defined(CONFIG_FB_OMAP) || defined(CONFIG_FB_OMAP_MODULE)

static struct omapfb_platform_data omapfb_config;
static int config_invalid;
static int configured_regions;

static u64 omap_fb_dma_mask = ~(u32)0;

static struct platform_device omap_fb_device = {
	.name		= "omapfb",
	.id		= -1,
	.dev = {
		.dma_mask		= &omap_fb_dma_mask,
		.coherent_dma_mask	= ~(u32)0,
		.platform_data		= &omapfb_config,
	},
	.num_resources = 0,
};

void omapfb_set_platform_data(struct omapfb_platform_data *data)
{
}

static inline int ranges_overlap(unsigned long start1, unsigned long size1,
				 unsigned long start2, unsigned long size2)
{
	return (start1 >= start2 && start1 < start2 + size2) ||
	       (start2 >= start1 && start2 < start1 + size1);
}

static inline int range_included(unsigned long start1, unsigned long size1,
				 unsigned long start2, unsigned long size2)
{
	return start1 >= start2 && start1 + size1 <= start2 + size2;
}


/* Check if there is an overlapping region. */
static int fbmem_region_reserved(unsigned long start, size_t size)
{
	struct omapfb_mem_region *rg;
	int i;

	rg = &omapfb_config.mem_desc.region[0];
	for (i = 0; i < OMAPFB_PLANE_NUM; i++, rg++) {
		if (!rg->paddr)
			/* Empty slot. */
			continue;
		if (ranges_overlap(start, size, rg->paddr, rg->size))
			return 1;
	}
	return 0;
}

/*
 * Get the region_idx`th region from board config/ATAG and convert it to
 * our internal format.
 */
static int get_fbmem_region(int region_idx, struct omapfb_mem_region *rg)
{
	const struct omap_fbmem_config	*conf;
	u32				paddr;

	conf = omap_get_nr_config(OMAP_TAG_FBMEM,
				  struct omap_fbmem_config, region_idx);
	if (conf == NULL)
		return -ENOENT;

	paddr = conf->start;
	/*
	 * Low bits encode the page allocation mode, if high bits
	 * are zero. Otherwise we need a page aligned fixed
	 * address.
	 */
	memset(rg, 0, sizeof(*rg));
	rg->type = paddr & ~PAGE_MASK;
	rg->paddr = paddr & PAGE_MASK;
	rg->size = PAGE_ALIGN(conf->size);
	return 0;
}

static int set_fbmem_region_type(struct omapfb_mem_region *rg, int mem_type,
				  unsigned long mem_start,
				  unsigned long mem_size)
{
	/*
	 * Check if the configuration specifies the type explicitly.
	 * type = 0 && paddr = 0, a default don't care case maps to
	 * the SDRAM type.
	 */
	if (rg->type || (!rg->type && !rg->paddr))
		return 0;
	if (ranges_overlap(rg->paddr, rg->size, mem_start, mem_size)) {
		rg->type = mem_type;
		return 0;
	}
	/* Can't determine it. */
	return -1;
}

static int check_fbmem_region(int region_idx, struct omapfb_mem_region *rg,
			      unsigned long start_avail, unsigned size_avail)
{
	unsigned long	paddr = rg->paddr;
	size_t		size = rg->size;

	if (rg->type > OMAPFB_MEMTYPE_MAX) {
		printk(KERN_ERR
			"Invalid start address for FB region %d\n", region_idx);
		return -EINVAL;
	}

	if (!rg->size) {
		printk(KERN_ERR "Zero size for FB region %d\n", region_idx);
		return -EINVAL;
	}

	if (!paddr)
		/* Allocate this dynamically, leave paddr 0 for now. */
		return 0;

	/*
	 * Fixed region for the given RAM range. Check if it's already
	 * reserved by the FB code or someone else.
	 */
	if (fbmem_region_reserved(paddr, size) ||
	    !range_included(paddr, size, start_avail, size_avail)) {
		printk(KERN_ERR "Trying to use reserved memory "
			"for FB region %d\n", region_idx);
		return -EINVAL;
	}

	return 0;
}

static int valid_sdram(unsigned long addr, unsigned long size)
{
	return memblock_is_region_memory(addr, size);
}

static int reserve_sdram(unsigned long addr, unsigned long size)
{
	if (memblock_is_region_reserved(addr, size))
		return -EBUSY;
	if (memblock_reserve(addr, size))
		return -ENOMEM;
	return 0;
}

/*
 * 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 omapfb_reserve_sdram_memblock(void)
{
	unsigned long reserved = 0;
	int i;

	if (config_invalid)
		return;

	for (i = 0; ; i++) {
		struct omapfb_mem_region rg;

		if (get_fbmem_region(i, &rg) < 0)
			break;

		if (i == OMAPFB_PLANE_NUM) {
			pr_err("Extraneous FB mem configuration entries\n");
			config_invalid = 1;
			return;
		}

		/* Check if it's our memory type. */
		if (rg.type != OMAPFB_MEMTYPE_SDRAM)
			continue;

		/* Check if the region falls within SDRAM */
		if (rg.paddr && !valid_sdram(rg.paddr, rg.size))
			continue;

		if (rg.size == 0) {
			pr_err("Zero size for FB region %d\n", i);
			config_invalid = 1;
			return;
		}

		if (rg.paddr) {
			if (reserve_sdram(rg.paddr, rg.size)) {
				pr_err("Trying to use reserved memory for FB region %d\n",
					i);
				config_invalid = 1;
				return;
			}
			reserved += rg.size;
		}

		if (omapfb_config.mem_desc.region[i].size) {
			pr_err("FB region %d already set\n", i);
			config_invalid = 1;
			return;
		}

		omapfb_config.mem_desc.region[i] = rg;
		configured_regions++;
	}
	omapfb_config.mem_desc.region_cnt = i;
	if (reserved)
		pr_info("Reserving %lu bytes SDRAM for frame buffer\n",
			 reserved);
}

/*
 * 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 omapfb_reserve_sram(unsigned long sram_pstart,
				  unsigned long sram_vstart,
				  unsigned long sram_size,
				  unsigned long pstart_avail,
				  unsigned long size_avail)
{
	struct omapfb_mem_region	rg;
	unsigned long			pend_avail;
	unsigned long			reserved;
	int				i;

	if (config_invalid)
		return 0;

	reserved = 0;
	pend_avail = pstart_avail + size_avail;
	for (i = 0; ; i++) {
		if (get_fbmem_region(i, &rg) < 0)
			break;
		if (i == OMAPFB_PLANE_NUM) {
			printk(KERN_ERR
				"Extraneous FB mem configuration entries\n");
			config_invalid = 1;
			return 0;
		}

		/* Check if it's our memory type. */
		if (set_fbmem_region_type(&rg, OMAPFB_MEMTYPE_SRAM,
				          sram_pstart, sram_size) < 0 ||
		    (rg.type != OMAPFB_MEMTYPE_SRAM))
			continue;
		BUG_ON(omapfb_config.mem_desc.region[i].size);

		if (check_fbmem_region(i, &rg, pstart_avail, size_avail) < 0) {
			config_invalid = 1;
			return 0;
		}

		if (!rg.paddr) {
			/* Dynamic allocation */
			if ((size_avail & PAGE_MASK) < rg.size) {
				printk("Not enough SRAM for FB region %d\n",
					i);
				config_invalid = 1;
				return 0;
			}
			size_avail = (size_avail - rg.size) & PAGE_MASK;
			rg.paddr = pstart_avail + size_avail;
		}
		/* Reserve everything above the start of the region. */
		if (pend_avail - rg.paddr > reserved)
			reserved = pend_avail - rg.paddr;
		size_avail = pend_avail - reserved - pstart_avail;

		/*
		 * We have a kernel mapping for this already, so the
		 * driver won't have to make one.
		 */
		rg.vaddr = (void *)(sram_vstart + rg.paddr - sram_pstart);
		omapfb_config.mem_desc.region[i] = rg;
		configured_regions++;
	}
	omapfb_config.mem_desc.region_cnt = i;
	if (reserved)
		pr_info("Reserving %lu bytes SRAM for frame buffer\n",
			 reserved);
	return reserved;
}

void omapfb_set_ctrl_platform_data(void *data)
{
	omapfb_config.ctrl_platform_data = data;
}

static inline int omap_init_fb(void)
{
	const struct omap_lcd_config *conf;

	if (config_invalid)
		return 0;
	if (configured_regions != omapfb_config.mem_desc.region_cnt) {
		printk(KERN_ERR "Invalid FB mem configuration entries\n");
		return 0;
	}
	conf = omap_get_config(OMAP_TAG_LCD, struct omap_lcd_config);
	if (conf == NULL) {
		if (configured_regions)
			/* FB mem config, but no LCD config? */
			printk(KERN_ERR "Missing LCD configuration\n");
		return 0;
	}
	omapfb_config.lcd = *conf;

	return platform_device_register(&omap_fb_device);
}

arch_initcall(omap_init_fb);

#elif defined(CONFIG_FB_OMAP2) || defined(CONFIG_FB_OMAP2_MODULE)

static u64 omap_fb_dma_mask = ~(u32)0;
static struct omapfb_platform_data omapfb_config;

static struct platform_device omap_fb_device = {
	.name		= "omapfb",
	.id		= -1,
	.dev = {
		.dma_mask		= &omap_fb_dma_mask,
		.coherent_dma_mask	= ~(u32)0,
		.platform_data		= &omapfb_config,
	},
	.num_resources = 0,
};

void omapfb_set_platform_data(struct omapfb_platform_data *data)
{
	omapfb_config = *data;
}

static inline int omap_init_fb(void)
{
	return platform_device_register(&omap_fb_device);
}

arch_initcall(omap_init_fb);

void omapfb_reserve_sdram_memblock(void)
{
}

unsigned long omapfb_reserve_sram(unsigned long sram_pstart,
				  unsigned long sram_vstart,
				  unsigned long sram_size,
				  unsigned long start_avail,
				  unsigned long size_avail)
{
	return 0;
}

#else

void omapfb_set_platform_data(struct omapfb_platform_data *data)
{
}

void omapfb_reserve_sdram_memblock(void)
{
}

unsigned long omapfb_reserve_sram(unsigned long sram_pstart,
				  unsigned long sram_vstart,
				  unsigned long sram_size,
				  unsigned long start_avail,
				  unsigned long size_avail)
{
	return 0;
}

#endif
OpenPOWER on IntegriCloud