2 * File: arch/arm/plat-omap/fb.c
4 * Framebuffer device registration for TI OMAP platforms
6 * Copyright (C) 2006 Nokia Corporation
7 * Author: Imre Deak <imre.deak@nokia.com>
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 #include <linux/module.h>
25 #include <linux/kernel.h>
27 #include <linux/init.h>
28 #include <linux/platform_device.h>
29 #include <linux/memblock.h>
31 #include <linux/omapfb.h>
33 #include <mach/hardware.h>
34 #include <asm/mach/map.h>
36 #include <plat/board.h>
37 #include <plat/sram.h>
39 #if defined(CONFIG_FB_OMAP) || defined(CONFIG_FB_OMAP_MODULE)
41 static struct omapfb_platform_data omapfb_config
;
42 static int config_invalid
;
43 static int configured_regions
;
45 static u64 omap_fb_dma_mask
= ~(u32
)0;
47 static struct platform_device omap_fb_device
= {
51 .dma_mask
= &omap_fb_dma_mask
,
52 .coherent_dma_mask
= ~(u32
)0,
53 .platform_data
= &omapfb_config
,
58 void omapfb_set_platform_data(struct omapfb_platform_data
*data
)
62 static inline int ranges_overlap(unsigned long start1
, unsigned long size1
,
63 unsigned long start2
, unsigned long size2
)
65 return (start1
>= start2
&& start1
< start2
+ size2
) ||
66 (start2
>= start1
&& start2
< start1
+ size1
);
69 static inline int range_included(unsigned long start1
, unsigned long size1
,
70 unsigned long start2
, unsigned long size2
)
72 return start1
>= start2
&& start1
+ size1
<= start2
+ size2
;
76 /* Check if there is an overlapping region. */
77 static int fbmem_region_reserved(unsigned long start
, size_t size
)
79 struct omapfb_mem_region
*rg
;
82 rg
= &omapfb_config
.mem_desc
.region
[0];
83 for (i
= 0; i
< OMAPFB_PLANE_NUM
; i
++, rg
++) {
87 if (ranges_overlap(start
, size
, rg
->paddr
, rg
->size
))
94 * Get the region_idx`th region from board config/ATAG and convert it to
95 * our internal format.
97 static int get_fbmem_region(int region_idx
, struct omapfb_mem_region
*rg
)
99 const struct omap_fbmem_config
*conf
;
102 conf
= omap_get_nr_config(OMAP_TAG_FBMEM
,
103 struct omap_fbmem_config
, region_idx
);
109 * Low bits encode the page allocation mode, if high bits
110 * are zero. Otherwise we need a page aligned fixed
113 memset(rg
, 0, sizeof(*rg
));
114 rg
->type
= paddr
& ~PAGE_MASK
;
115 rg
->paddr
= paddr
& PAGE_MASK
;
116 rg
->size
= PAGE_ALIGN(conf
->size
);
120 static int set_fbmem_region_type(struct omapfb_mem_region
*rg
, int mem_type
,
121 unsigned long mem_start
,
122 unsigned long mem_size
)
125 * Check if the configuration specifies the type explicitly.
126 * type = 0 && paddr = 0, a default don't care case maps to
129 if (rg
->type
|| (!rg
->type
&& !rg
->paddr
))
131 if (ranges_overlap(rg
->paddr
, rg
->size
, mem_start
, mem_size
)) {
135 /* Can't determine it. */
139 static int check_fbmem_region(int region_idx
, struct omapfb_mem_region
*rg
,
140 unsigned long start_avail
, unsigned size_avail
)
142 unsigned long paddr
= rg
->paddr
;
143 size_t size
= rg
->size
;
145 if (rg
->type
> OMAPFB_MEMTYPE_MAX
) {
147 "Invalid start address for FB region %d\n", region_idx
);
152 printk(KERN_ERR
"Zero size for FB region %d\n", region_idx
);
157 /* Allocate this dynamically, leave paddr 0 for now. */
161 * Fixed region for the given RAM range. Check if it's already
162 * reserved by the FB code or someone else.
164 if (fbmem_region_reserved(paddr
, size
) ||
165 !range_included(paddr
, size
, start_avail
, size_avail
)) {
166 printk(KERN_ERR
"Trying to use reserved memory "
167 "for FB region %d\n", region_idx
);
174 static int valid_sdram(unsigned long addr
, unsigned long size
)
176 struct memblock_property res
;
180 return !memblock_find(&res
) && res
.base
== addr
&& res
.size
== size
;
183 static int reserve_sdram(unsigned long addr
, unsigned long size
)
185 if (memblock_is_region_reserved(addr
, size
))
187 if (memblock_reserve(addr
, size
))
193 * Called from map_io. We need to call to this early enough so that we
194 * can reserve the fixed SDRAM regions before VM could get hold of them.
196 void __init
omapfb_reserve_sdram_memblock(void)
198 unsigned long reserved
= 0;
205 struct omapfb_mem_region rg
;
207 if (get_fbmem_region(i
, &rg
) < 0)
210 if (i
== OMAPFB_PLANE_NUM
) {
211 pr_err("Extraneous FB mem configuration entries\n");
216 /* Check if it's our memory type. */
217 if (rg
.type
!= OMAPFB_MEMTYPE_SDRAM
)
220 /* Check if the region falls within SDRAM */
221 if (rg
.paddr
&& !valid_sdram(rg
.paddr
, rg
.size
))
225 pr_err("Zero size for FB region %d\n", i
);
231 if (reserve_sdram(rg
.paddr
, rg
.size
)) {
232 pr_err("Trying to use reserved memory for FB region %d\n",
240 if (omapfb_config
.mem_desc
.region
[i
].size
) {
241 pr_err("FB region %d already set\n", i
);
246 omapfb_config
.mem_desc
.region
[i
] = rg
;
247 configured_regions
++;
249 omapfb_config
.mem_desc
.region_cnt
= i
;
251 pr_info("Reserving %lu bytes SDRAM for frame buffer\n",
256 * Called at sram init time, before anything is pushed to the SRAM stack.
257 * Because of the stack scheme, we will allocate everything from the
258 * start of the lowest address region to the end of SRAM. This will also
259 * include padding for page alignment and possible holes between regions.
261 * As opposed to the SDRAM case, we'll also do any dynamic allocations at
262 * this point, since the driver built as a module would have problem with
263 * freeing / reallocating the regions.
265 unsigned long omapfb_reserve_sram(unsigned long sram_pstart
,
266 unsigned long sram_vstart
,
267 unsigned long sram_size
,
268 unsigned long pstart_avail
,
269 unsigned long size_avail
)
271 struct omapfb_mem_region rg
;
272 unsigned long pend_avail
;
273 unsigned long reserved
;
280 pend_avail
= pstart_avail
+ size_avail
;
282 if (get_fbmem_region(i
, &rg
) < 0)
284 if (i
== OMAPFB_PLANE_NUM
) {
286 "Extraneous FB mem configuration entries\n");
291 /* Check if it's our memory type. */
292 if (set_fbmem_region_type(&rg
, OMAPFB_MEMTYPE_SRAM
,
293 sram_pstart
, sram_size
) < 0 ||
294 (rg
.type
!= OMAPFB_MEMTYPE_SRAM
))
296 BUG_ON(omapfb_config
.mem_desc
.region
[i
].size
);
298 if (check_fbmem_region(i
, &rg
, pstart_avail
, size_avail
) < 0) {
304 /* Dynamic allocation */
305 if ((size_avail
& PAGE_MASK
) < rg
.size
) {
306 printk("Not enough SRAM for FB region %d\n",
311 size_avail
= (size_avail
- rg
.size
) & PAGE_MASK
;
312 rg
.paddr
= pstart_avail
+ size_avail
;
314 /* Reserve everything above the start of the region. */
315 if (pend_avail
- rg
.paddr
> reserved
)
316 reserved
= pend_avail
- rg
.paddr
;
317 size_avail
= pend_avail
- reserved
- pstart_avail
;
320 * We have a kernel mapping for this already, so the
321 * driver won't have to make one.
323 rg
.vaddr
= (void *)(sram_vstart
+ rg
.paddr
- sram_pstart
);
324 omapfb_config
.mem_desc
.region
[i
] = rg
;
325 configured_regions
++;
327 omapfb_config
.mem_desc
.region_cnt
= i
;
329 pr_info("Reserving %lu bytes SRAM for frame buffer\n",
334 void omapfb_set_ctrl_platform_data(void *data
)
336 omapfb_config
.ctrl_platform_data
= data
;
339 static inline int omap_init_fb(void)
341 const struct omap_lcd_config
*conf
;
345 if (configured_regions
!= omapfb_config
.mem_desc
.region_cnt
) {
346 printk(KERN_ERR
"Invalid FB mem configuration entries\n");
349 conf
= omap_get_config(OMAP_TAG_LCD
, struct omap_lcd_config
);
351 if (configured_regions
)
352 /* FB mem config, but no LCD config? */
353 printk(KERN_ERR
"Missing LCD configuration\n");
356 omapfb_config
.lcd
= *conf
;
358 return platform_device_register(&omap_fb_device
);
361 arch_initcall(omap_init_fb
);
363 #elif defined(CONFIG_FB_OMAP2) || defined(CONFIG_FB_OMAP2_MODULE)
365 static u64 omap_fb_dma_mask
= ~(u32
)0;
366 static struct omapfb_platform_data omapfb_config
;
368 static struct platform_device omap_fb_device
= {
372 .dma_mask
= &omap_fb_dma_mask
,
373 .coherent_dma_mask
= ~(u32
)0,
374 .platform_data
= &omapfb_config
,
379 void omapfb_set_platform_data(struct omapfb_platform_data
*data
)
381 omapfb_config
= *data
;
384 static inline int omap_init_fb(void)
386 return platform_device_register(&omap_fb_device
);
389 arch_initcall(omap_init_fb
);
391 void omapfb_reserve_sdram_memblock(void)
395 unsigned long omapfb_reserve_sram(unsigned long sram_pstart
,
396 unsigned long sram_vstart
,
397 unsigned long sram_size
,
398 unsigned long start_avail
,
399 unsigned long size_avail
)
406 void omapfb_set_platform_data(struct omapfb_platform_data
*data
)
410 void omapfb_reserve_sdram_memblock(void)
414 unsigned long omapfb_reserve_sram(unsigned long sram_pstart
,
415 unsigned long sram_vstart
,
416 unsigned long sram_size
,
417 unsigned long start_avail
,
418 unsigned long size_avail
)