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)