1/* 2 * File: arch/arm/plat-omap/fb.c 3 * 4 * Framebuffer device registration for TI OMAP platforms 5 * 6 * Copyright (C) 2006 Nokia Corporation 7 * Author: Imre Deak <imre.deak@nokia.com> 8 * 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. 13 * 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. 18 * 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. 22 */ 23 24#include <linux/module.h> 25#include <linux/kernel.h> 26#include <linux/mm.h> 27#include <linux/init.h> 28#include <linux/platform_device.h> 29#include <linux/memblock.h> 30#include <linux/io.h> 31#include <linux/omapfb.h> 32 33#include <mach/hardware.h> 34#include <asm/mach/map.h> 35 36#include <plat/board.h> 37#include <plat/sram.h> 38 39#if defined(CONFIG_FB_OMAP) || defined(CONFIG_FB_OMAP_MODULE) 40 41static struct omapfb_platform_data omapfb_config; 42static int config_invalid; 43static int configured_regions; 44 45static u64 omap_fb_dma_mask = ~(u32)0; 46 47static struct platform_device omap_fb_device = { 48 .name = "omapfb", 49 .id = -1, 50 .dev = { 51 .dma_mask = &omap_fb_dma_mask, 52 .coherent_dma_mask = ~(u32)0, 53 .platform_data = &omapfb_config, 54 }, 55 .num_resources = 0, 56}; 57 58void omapfb_set_platform_data(struct omapfb_platform_data *data) 59{ 60} 61 62static inline int ranges_overlap(unsigned long start1, unsigned long size1, 63 unsigned long start2, unsigned long size2) 64{ 65 return (start1 >= start2 && start1 < start2 + size2) || 66 (start2 >= start1 && start2 < start1 + size1); 67} 68 69static inline int range_included(unsigned long start1, unsigned long size1, 70 unsigned long start2, unsigned long size2) 71{ 72 return start1 >= start2 && start1 + size1 <= start2 + size2; 73} 74 75 76/* Check if there is an overlapping region. */ 77static int fbmem_region_reserved(unsigned long start, size_t size) 78{ 79 struct omapfb_mem_region *rg; 80 int i; 81 82 rg = &omapfb_config.mem_desc.region[0]; 83 for (i = 0; i < OMAPFB_PLANE_NUM; i++, rg++) { 84 if (!rg->paddr) 85 /* Empty slot. */ 86 continue; 87 if (ranges_overlap(start, size, rg->paddr, rg->size)) 88 return 1; 89 } 90 return 0; 91} 92 93/* 94 * Get the region_idx`th region from board config/ATAG and convert it to 95 * our internal format. 96 */ 97static int get_fbmem_region(int region_idx, struct omapfb_mem_region *rg) 98{ 99 const struct omap_fbmem_config *conf; 100 u32 paddr; 101 102 conf = omap_get_nr_config(OMAP_TAG_FBMEM, 103 struct omap_fbmem_config, region_idx); 104 if (conf == NULL) 105 return -ENOENT; 106 107 paddr = conf->start; 108 /* 109 * Low bits encode the page allocation mode, if high bits 110 * are zero. Otherwise we need a page aligned fixed 111 * address. 112 */ 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); 117 return 0; 118} 119 120static int set_fbmem_region_type(struct omapfb_mem_region *rg, int mem_type, 121 unsigned long mem_start, 122 unsigned long mem_size) 123{ 124 /* 125 * Check if the configuration specifies the type explicitly. 126 * type = 0 && paddr = 0, a default don't care case maps to 127 * the SDRAM type. 128 */ 129 if (rg->type || (!rg->type && !rg->paddr)) 130 return 0; 131 if (ranges_overlap(rg->paddr, rg->size, mem_start, mem_size)) { 132 rg->type = mem_type; 133 return 0; 134 } 135 /* Can't determine it. */ 136 return -1; 137} 138 139static int check_fbmem_region(int region_idx, struct omapfb_mem_region *rg, 140 unsigned long start_avail, unsigned size_avail) 141{ 142 unsigned long paddr = rg->paddr; 143 size_t size = rg->size; 144 145 if (rg->type > OMAPFB_MEMTYPE_MAX) { 146 printk(KERN_ERR 147 "Invalid start address for FB region %d\n", region_idx); 148 return -EINVAL; 149 } 150 151 if (!rg->size) { 152 printk(KERN_ERR "Zero size for FB region %d\n", region_idx); 153 return -EINVAL; 154 } 155 156 if (!paddr) 157 /* Allocate this dynamically, leave paddr 0 for now. */ 158 return 0; 159 160 /* 161 * Fixed region for the given RAM range. Check if it's already 162 * reserved by the FB code or someone else. 163 */ 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); 168 return -EINVAL; 169 } 170 171 return 0; 172} 173 174static int valid_sdram(unsigned long addr, unsigned long size) 175{ 176 struct memblock_property res; 177 178 res.base = addr; 179 res.size = size; 180 return !memblock_find(&res) && res.base == addr && res.size == size; 181} 182 183static int reserve_sdram(unsigned long addr, unsigned long size) 184{ 185 if (memblock_is_region_reserved(addr, size)) 186 return -EBUSY; 187 if (memblock_reserve(addr, size)) 188 return -ENOMEM; 189 return 0; 190} 191 192/* 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. 195 */ 196void __init omapfb_reserve_sdram_memblock(void) 197{ 198 unsigned long reserved = 0; 199 int i; 200 201 if (config_invalid) 202 return; 203 204 for (i = 0; ; i++) { 205 struct omapfb_mem_region rg; 206 207 if (get_fbmem_region(i, &rg) < 0) 208 break; 209 210 if (i == OMAPFB_PLANE_NUM) { 211 pr_err("Extraneous FB mem configuration entries\n"); 212 config_invalid = 1; 213 return; 214 } 215 216 /* Check if it's our memory type. */ 217 if (rg.type != OMAPFB_MEMTYPE_SDRAM) 218 continue; 219 220 /* Check if the region falls within SDRAM */ 221 if (rg.paddr && !valid_sdram(rg.paddr, rg.size)) 222 continue; 223 224 if (rg.size == 0) { 225 pr_err("Zero size for FB region %d\n", i); 226 config_invalid = 1; 227 return; 228 } 229 230 if (rg.paddr) { 231 if (reserve_sdram(rg.paddr, rg.size)) { 232 pr_err("Trying to use reserved memory for FB region %d\n", 233 i); 234 config_invalid = 1; 235 return; 236 } 237 reserved += rg.size; 238 } 239 240 if (omapfb_config.mem_desc.region[i].size) { 241 pr_err("FB region %d already set\n", i); 242 config_invalid = 1; 243 return; 244 } 245 246 omapfb_config.mem_desc.region[i] = rg; 247 configured_regions++; 248 } 249 omapfb_config.mem_desc.region_cnt = i; 250 if (reserved) 251 pr_info("Reserving %lu bytes SDRAM for frame buffer\n", 252 reserved); 253} 254 255/* 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. 260 * 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. 264 */ 265unsigned 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) 270{ 271 struct omapfb_mem_region rg; 272 unsigned long pend_avail; 273 unsigned long reserved; 274 int i; 275 276 if (config_invalid) 277 return 0; 278 279 reserved = 0; 280 pend_avail = pstart_avail + size_avail; 281 for (i = 0; ; i++) { 282 if (get_fbmem_region(i, &rg) < 0) 283 break; 284 if (i == OMAPFB_PLANE_NUM) { 285 printk(KERN_ERR 286 "Extraneous FB mem configuration entries\n"); 287 config_invalid = 1; 288 return 0; 289 } 290 291 /* 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)) 295 continue; 296 BUG_ON(omapfb_config.mem_desc.region[i].size); 297 298 if (check_fbmem_region(i, &rg, pstart_avail, size_avail) < 0) { 299 config_invalid = 1; 300 return 0; 301 } 302 303 if (!rg.paddr) { 304 /* Dynamic allocation */ 305 if ((size_avail & PAGE_MASK) < rg.size) { 306 printk("Not enough SRAM for FB region %d\n", 307 i); 308 config_invalid = 1; 309 return 0; 310 } 311 size_avail = (size_avail - rg.size) & PAGE_MASK; 312 rg.paddr = pstart_avail + size_avail; 313 } 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; 318 319 /* 320 * We have a kernel mapping for this already, so the 321 * driver won't have to make one. 322 */ 323 rg.vaddr = (void *)(sram_vstart + rg.paddr - sram_pstart); 324 omapfb_config.mem_desc.region[i] = rg; 325 configured_regions++; 326 } 327 omapfb_config.mem_desc.region_cnt = i; 328 if (reserved) 329 pr_info("Reserving %lu bytes SRAM for frame buffer\n", 330 reserved); 331 return reserved; 332} 333 334void omapfb_set_ctrl_platform_data(void *data) 335{ 336 omapfb_config.ctrl_platform_data = data; 337} 338 339static inline int omap_init_fb(void) 340{ 341 const struct omap_lcd_config *conf; 342 343 if (config_invalid) 344 return 0; 345 if (configured_regions != omapfb_config.mem_desc.region_cnt) { 346 printk(KERN_ERR "Invalid FB mem configuration entries\n"); 347 return 0; 348 } 349 conf = omap_get_config(OMAP_TAG_LCD, struct omap_lcd_config); 350 if (conf == NULL) { 351 if (configured_regions) 352 /* FB mem config, but no LCD config? */ 353 printk(KERN_ERR "Missing LCD configuration\n"); 354 return 0; 355 } 356 omapfb_config.lcd = *conf; 357 358 return platform_device_register(&omap_fb_device); 359} 360 361arch_initcall(omap_init_fb); 362 363#elif defined(CONFIG_FB_OMAP2) || defined(CONFIG_FB_OMAP2_MODULE) 364 365static u64 omap_fb_dma_mask = ~(u32)0; 366static struct omapfb_platform_data omapfb_config; 367 368static struct platform_device omap_fb_device = { 369 .name = "omapfb", 370 .id = -1, 371 .dev = { 372 .dma_mask = &omap_fb_dma_mask, 373 .coherent_dma_mask = ~(u32)0, 374 .platform_data = &omapfb_config, 375 }, 376 .num_resources = 0, 377}; 378 379void omapfb_set_platform_data(struct omapfb_platform_data *data) 380{ 381 omapfb_config = *data; 382} 383 384static inline int omap_init_fb(void) 385{ 386 return platform_device_register(&omap_fb_device); 387} 388 389arch_initcall(omap_init_fb); 390 391void omapfb_reserve_sdram_memblock(void) 392{ 393} 394 395unsigned 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) 400{ 401 return 0; 402} 403 404#else 405 406void omapfb_set_platform_data(struct omapfb_platform_data *data) 407{ 408} 409 410void omapfb_reserve_sdram_memblock(void) 411{ 412} 413 414unsigned 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) 419{ 420 return 0; 421} 422 423#endif 424