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>
41 #if defined(CONFIG_FB_OMAP) || defined(CONFIG_FB_OMAP_MODULE)
43 static struct omapfb_platform_data omapfb_config
;
44 static int config_invalid
;
45 static int configured_regions
;
47 static u64 omap_fb_dma_mask
= ~(u32
)0;
49 static struct platform_device omap_fb_device
= {
53 .dma_mask
= &omap_fb_dma_mask
,
54 .coherent_dma_mask
= ~(u32
)0,
55 .platform_data
= &omapfb_config
,
60 void omapfb_set_platform_data(struct omapfb_platform_data
*data
)
64 static inline int ranges_overlap(unsigned long start1
, unsigned long size1
,
65 unsigned long start2
, unsigned long size2
)
67 return (start1
>= start2
&& start1
< start2
+ size2
) ||
68 (start2
>= start1
&& start2
< start1
+ size1
);
71 static inline int range_included(unsigned long start1
, unsigned long size1
,
72 unsigned long start2
, unsigned long size2
)
74 return start1
>= start2
&& start1
+ size1
<= start2
+ size2
;
78 /* Check if there is an overlapping region. */
79 static int fbmem_region_reserved(unsigned long start
, size_t size
)
81 struct omapfb_mem_region
*rg
;
84 rg
= &omapfb_config
.mem_desc
.region
[0];
85 for (i
= 0; i
< OMAPFB_PLANE_NUM
; i
++, rg
++) {
89 if (ranges_overlap(start
, size
, rg
->paddr
, rg
->size
))
96 * Get the region_idx`th region from board config/ATAG and convert it to
97 * our internal format.
99 static int __init
get_fbmem_region(int region_idx
, struct omapfb_mem_region
*rg
)
101 const struct omap_fbmem_config
*conf
;
104 conf
= omap_get_nr_config(OMAP_TAG_FBMEM
,
105 struct omap_fbmem_config
, region_idx
);
111 * Low bits encode the page allocation mode, if high bits
112 * are zero. Otherwise we need a page aligned fixed
115 memset(rg
, 0, sizeof(*rg
));
116 rg
->type
= paddr
& ~PAGE_MASK
;
117 rg
->paddr
= paddr
& PAGE_MASK
;
118 rg
->size
= PAGE_ALIGN(conf
->size
);
122 static int set_fbmem_region_type(struct omapfb_mem_region
*rg
, int mem_type
,
123 unsigned long mem_start
,
124 unsigned long mem_size
)
127 * Check if the configuration specifies the type explicitly.
128 * type = 0 && paddr = 0, a default don't care case maps to
131 if (rg
->type
|| !rg
->paddr
)
133 if (ranges_overlap(rg
->paddr
, rg
->size
, mem_start
, mem_size
)) {
137 /* Can't determine it. */
141 static int check_fbmem_region(int region_idx
, struct omapfb_mem_region
*rg
,
142 unsigned long start_avail
, unsigned size_avail
)
144 unsigned long paddr
= rg
->paddr
;
145 size_t size
= rg
->size
;
147 if (rg
->type
> OMAPFB_MEMTYPE_MAX
) {
149 "Invalid start address for FB region %d\n", region_idx
);
154 printk(KERN_ERR
"Zero size for FB region %d\n", region_idx
);
159 /* Allocate this dynamically, leave paddr 0 for now. */
163 * Fixed region for the given RAM range. Check if it's already
164 * reserved by the FB code or someone else.
166 if (fbmem_region_reserved(paddr
, size
) ||
167 !range_included(paddr
, size
, start_avail
, size_avail
)) {
168 printk(KERN_ERR
"Trying to use reserved memory "
169 "for FB region %d\n", region_idx
);
176 static int valid_sdram(unsigned long addr
, unsigned long size
)
178 return memblock_is_region_memory(addr
, size
);
181 static int reserve_sdram(unsigned long addr
, unsigned long size
)
183 if (memblock_is_region_reserved(addr
, size
))
185 if (memblock_reserve(addr
, size
))
191 * Called from map_io. We need to call to this early enough so that we
192 * can reserve the fixed SDRAM regions before VM could get hold of them.
194 void __init
omapfb_reserve_sdram_memblock(void)
196 unsigned long reserved
= 0;
203 struct omapfb_mem_region rg
;
205 if (get_fbmem_region(i
, &rg
) < 0)
208 if (i
== OMAPFB_PLANE_NUM
) {
209 pr_err("Extraneous FB mem configuration entries\n");
214 /* Check if it's our memory type. */
215 if (rg
.type
!= OMAPFB_MEMTYPE_SDRAM
)
218 /* Check if the region falls within SDRAM */
219 if (rg
.paddr
&& !valid_sdram(rg
.paddr
, rg
.size
))
223 pr_err("Zero size for FB region %d\n", i
);
229 if (reserve_sdram(rg
.paddr
, rg
.size
)) {
230 pr_err("Trying to use reserved memory for FB region %d\n",
238 if (omapfb_config
.mem_desc
.region
[i
].size
) {
239 pr_err("FB region %d already set\n", i
);
244 omapfb_config
.mem_desc
.region
[i
] = rg
;
245 configured_regions
++;
247 omapfb_config
.mem_desc
.region_cnt
= i
;
249 pr_info("Reserving %lu bytes SDRAM for frame buffer\n",
254 * Called at sram init time, before anything is pushed to the SRAM stack.
255 * Because of the stack scheme, we will allocate everything from the
256 * start of the lowest address region to the end of SRAM. This will also
257 * include padding for page alignment and possible holes between regions.
259 * As opposed to the SDRAM case, we'll also do any dynamic allocations at
260 * this point, since the driver built as a module would have problem with
261 * freeing / reallocating the regions.
263 unsigned long __init
omapfb_reserve_sram(unsigned long sram_pstart
,
264 unsigned long sram_vstart
,
265 unsigned long sram_size
,
266 unsigned long pstart_avail
,
267 unsigned long size_avail
)
269 struct omapfb_mem_region rg
;
270 unsigned long pend_avail
;
271 unsigned long reserved
;
278 pend_avail
= pstart_avail
+ size_avail
;
280 if (get_fbmem_region(i
, &rg
) < 0)
282 if (i
== OMAPFB_PLANE_NUM
) {
284 "Extraneous FB mem configuration entries\n");
289 /* Check if it's our memory type. */
290 if (set_fbmem_region_type(&rg
, OMAPFB_MEMTYPE_SRAM
,
291 sram_pstart
, sram_size
) < 0 ||
292 (rg
.type
!= OMAPFB_MEMTYPE_SRAM
))
294 BUG_ON(omapfb_config
.mem_desc
.region
[i
].size
);
296 if (check_fbmem_region(i
, &rg
, pstart_avail
, size_avail
) < 0) {
302 /* Dynamic allocation */
303 if ((size_avail
& PAGE_MASK
) < rg
.size
) {
304 printk("Not enough SRAM for FB region %d\n",
309 size_avail
= (size_avail
- rg
.size
) & PAGE_MASK
;
310 rg
.paddr
= pstart_avail
+ size_avail
;
312 /* Reserve everything above the start of the region. */
313 if (pend_avail
- rg
.paddr
> reserved
)
314 reserved
= pend_avail
- rg
.paddr
;
315 size_avail
= pend_avail
- reserved
- pstart_avail
;
318 * We have a kernel mapping for this already, so the
319 * driver won't have to make one.
321 rg
.vaddr
= (void *)(sram_vstart
+ rg
.paddr
- sram_pstart
);
322 omapfb_config
.mem_desc
.region
[i
] = rg
;
323 configured_regions
++;
325 omapfb_config
.mem_desc
.region_cnt
= i
;
327 pr_info("Reserving %lu bytes SRAM for frame buffer\n",
332 void omapfb_set_ctrl_platform_data(void *data
)
334 omapfb_config
.ctrl_platform_data
= data
;
337 static int __init
omap_init_fb(void)
339 const struct omap_lcd_config
*conf
;
343 if (configured_regions
!= omapfb_config
.mem_desc
.region_cnt
) {
344 printk(KERN_ERR
"Invalid FB mem configuration entries\n");
347 conf
= omap_get_config(OMAP_TAG_LCD
, struct omap_lcd_config
);
349 if (configured_regions
)
350 /* FB mem config, but no LCD config? */
351 printk(KERN_ERR
"Missing LCD configuration\n");
354 omapfb_config
.lcd
= *conf
;
356 return platform_device_register(&omap_fb_device
);
359 arch_initcall(omap_init_fb
);
361 #elif defined(CONFIG_FB_OMAP2) || defined(CONFIG_FB_OMAP2_MODULE)
363 static u64 omap_fb_dma_mask
= ~(u32
)0;
364 static struct omapfb_platform_data omapfb_config
;
366 static struct platform_device omap_fb_device
= {
370 .dma_mask
= &omap_fb_dma_mask
,
371 .coherent_dma_mask
= ~(u32
)0,
372 .platform_data
= &omapfb_config
,
377 void omapfb_set_platform_data(struct omapfb_platform_data
*data
)
379 omapfb_config
= *data
;
382 static int __init
omap_init_fb(void)
384 return platform_device_register(&omap_fb_device
);
387 arch_initcall(omap_init_fb
);
389 void omapfb_reserve_sdram_memblock(void)
393 unsigned long __init
omapfb_reserve_sram(unsigned long sram_pstart
,
394 unsigned long sram_vstart
,
395 unsigned long sram_size
,
396 unsigned long start_avail
,
397 unsigned long size_avail
)
404 void omapfb_set_platform_data(struct omapfb_platform_data
*data
)
408 void omapfb_reserve_sdram_memblock(void)
412 unsigned long __init
omapfb_reserve_sram(unsigned long sram_pstart
,
413 unsigned long sram_vstart
,
414 unsigned long sram_size
,
415 unsigned long start_avail
,
416 unsigned long size_avail
)