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/bootmem.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 static inline int ranges_overlap(unsigned long start1, unsigned long size1,
59 unsigned long start2, unsigned long size2)
61 return (start1 >= start2 && start1 < start2 + size2) ||
62 (start2 >= start1 && start2 < start1 + size1);
65 static inline int range_included(unsigned long start1, unsigned long size1,
66 unsigned long start2, unsigned long size2)
68 return start1 >= start2 && start1 + size1 <= start2 + size2;
72 /* Check if there is an overlapping region. */
73 static int fbmem_region_reserved(unsigned long start, size_t size)
75 struct omapfb_mem_region *rg;
78 rg = &omapfb_config.mem_desc.region[0];
79 for (i = 0; i < OMAPFB_PLANE_NUM; i++, rg++) {
83 if (ranges_overlap(start, size, rg->paddr, rg->size))
90 * Get the region_idx`th region from board config/ATAG and convert it to
91 * our internal format.
93 static int get_fbmem_region(int region_idx, struct omapfb_mem_region *rg)
95 const struct omap_fbmem_config *conf;
98 conf = omap_get_nr_config(OMAP_TAG_FBMEM,
99 struct omap_fbmem_config, region_idx);
105 * Low bits encode the page allocation mode, if high bits
106 * are zero. Otherwise we need a page aligned fixed
109 memset(rg, 0, sizeof(*rg));
110 rg->type = paddr & ~PAGE_MASK;
111 rg->paddr = paddr & PAGE_MASK;
112 rg->size = PAGE_ALIGN(conf->size);
116 static int set_fbmem_region_type(struct omapfb_mem_region *rg, int mem_type,
117 unsigned long mem_start,
118 unsigned long mem_size)
121 * Check if the configuration specifies the type explicitly.
122 * type = 0 && paddr = 0, a default don't care case maps to
125 if (rg->type || (!rg->type && !rg->paddr))
127 if (ranges_overlap(rg->paddr, rg->size, mem_start, mem_size)) {
131 /* Can't determine it. */
135 static int check_fbmem_region(int region_idx, struct omapfb_mem_region *rg,
136 unsigned long start_avail, unsigned size_avail)
138 unsigned long paddr = rg->paddr;
139 size_t size = rg->size;
141 if (rg->type > OMAPFB_MEMTYPE_MAX) {
143 "Invalid start address for FB region %d\n", region_idx);
148 printk(KERN_ERR "Zero size for FB region %d\n", region_idx);
153 /* Allocate this dynamically, leave paddr 0 for now. */
157 * Fixed region for the given RAM range. Check if it's already
158 * reserved by the FB code or someone else.
160 if (fbmem_region_reserved(paddr, size) ||
161 !range_included(paddr, size, start_avail, size_avail)) {
162 printk(KERN_ERR "Trying to use reserved memory "
163 "for FB region %d\n", region_idx);
171 * Called from map_io. We need to call to this early enough so that we
172 * can reserve the fixed SDRAM regions before VM could get hold of them.
174 void __init omapfb_reserve_sdram(void)
176 struct bootmem_data *bdata;
177 unsigned long sdram_start, sdram_size;
178 unsigned long reserved;
184 bdata = NODE_DATA(0)->bdata;
185 sdram_start = bdata->node_min_pfn << PAGE_SHIFT;
186 sdram_size = (bdata->node_low_pfn << PAGE_SHIFT) - sdram_start;
189 struct omapfb_mem_region rg;
191 if (get_fbmem_region(i, &rg) < 0)
193 if (i == OMAPFB_PLANE_NUM) {
195 "Extraneous FB mem configuration entries\n");
199 /* Check if it's our memory type. */
200 if (set_fbmem_region_type(&rg, OMAPFB_MEMTYPE_SDRAM,
201 sdram_start, sdram_size) < 0 ||
202 (rg.type != OMAPFB_MEMTYPE_SDRAM))
204 BUG_ON(omapfb_config.mem_desc.region[i].size);
205 if (check_fbmem_region(i, &rg, sdram_start, sdram_size) < 0) {
210 reserve_bootmem(rg.paddr, rg.size, BOOTMEM_DEFAULT);
213 omapfb_config.mem_desc.region[i] = rg;
214 configured_regions++;
216 omapfb_config.mem_desc.region_cnt = i;
218 pr_info("Reserving %lu bytes SDRAM for frame buffer\n",
223 * Called at sram init time, before anything is pushed to the SRAM stack.
224 * Because of the stack scheme, we will allocate everything from the
225 * start of the lowest address region to the end of SRAM. This will also
226 * include padding for page alignment and possible holes between regions.
228 * As opposed to the SDRAM case, we'll also do any dynamic allocations at
229 * this point, since the driver built as a module would have problem with
230 * freeing / reallocating the regions.
232 unsigned long omapfb_reserve_sram(unsigned long sram_pstart,
233 unsigned long sram_vstart,
234 unsigned long sram_size,
235 unsigned long pstart_avail,
236 unsigned long size_avail)
238 struct omapfb_mem_region rg;
239 unsigned long pend_avail;
240 unsigned long reserved;
247 pend_avail = pstart_avail + size_avail;
249 if (get_fbmem_region(i, &rg) < 0)
251 if (i == OMAPFB_PLANE_NUM) {
253 "Extraneous FB mem configuration entries\n");
258 /* Check if it's our memory type. */
259 if (set_fbmem_region_type(&rg, OMAPFB_MEMTYPE_SRAM,
260 sram_pstart, sram_size) < 0 ||
261 (rg.type != OMAPFB_MEMTYPE_SRAM))
263 BUG_ON(omapfb_config.mem_desc.region[i].size);
265 if (check_fbmem_region(i, &rg, pstart_avail, size_avail) < 0) {
271 /* Dynamic allocation */
272 if ((size_avail & PAGE_MASK) < rg.size) {
273 printk("Not enough SRAM for FB region %d\n",
278 size_avail = (size_avail - rg.size) & PAGE_MASK;
279 rg.paddr = pstart_avail + size_avail;
281 /* Reserve everything above the start of the region. */
282 if (pend_avail - rg.paddr > reserved)
283 reserved = pend_avail - rg.paddr;
284 size_avail = pend_avail - reserved - pstart_avail;
287 * We have a kernel mapping for this already, so the
288 * driver won't have to make one.
290 rg.vaddr = (void *)(sram_vstart + rg.paddr - sram_pstart);
291 omapfb_config.mem_desc.region[i] = rg;
292 configured_regions++;
294 omapfb_config.mem_desc.region_cnt = i;
296 pr_info("Reserving %lu bytes SRAM for frame buffer\n",
301 void omapfb_set_ctrl_platform_data(void *data)
303 omapfb_config.ctrl_platform_data = data;
306 static inline int omap_init_fb(void)
308 const struct omap_lcd_config *conf;
312 if (configured_regions != omapfb_config.mem_desc.region_cnt) {
313 printk(KERN_ERR "Invalid FB mem configuration entries\n");
316 conf = omap_get_config(OMAP_TAG_LCD, struct omap_lcd_config);
318 if (configured_regions)
319 /* FB mem config, but no LCD config? */
320 printk(KERN_ERR "Missing LCD configuration\n");
323 omapfb_config.lcd = *conf;
325 return platform_device_register(&omap_fb_device);
328 arch_initcall(omap_init_fb);
332 void omapfb_reserve_sdram(void) {}
333 unsigned long omapfb_reserve_sram(unsigned long sram_pstart,
334 unsigned long sram_vstart,
335 unsigned long sram_size,
336 unsigned long start_avail,
337 unsigned long size_avail)