arch/arm/plat-omap/fb.c

   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
  41 static struct omapfb_platform_data omapfb_config;
  42 static int config_invalid;
  43 static int configured_regions;
  44
  45 static u64 omap_fb_dma_mask = ~(u32)0;
  46
  47 static 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
  58 void omapfb_set_platform_data(struct omapfb_platform_data *data)
  59 {
  60 }
  61
  62 static 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
  69 static 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. */
  77 static 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  */
  97 static 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
 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)
 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
 139 static 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
 174 static int valid_sdram(unsigned long addr, unsigned long size)
 175 {
 176         return memblock_is_region_memory(addr, size);
 177 }
 178
 179 static int reserve_sdram(unsigned long addr, unsigned long size)
 180 {
 181         if (memblock_is_region_reserved(addr, size))
 182                 return -EBUSY;
 183         if (memblock_reserve(addr, size))
 184                 return -ENOMEM;
 185         return 0;
 186 }
 187
 188 /*
 189  * Called from map_io. We need to call to this early enough so that we
 190  * can reserve the fixed SDRAM regions before VM could get hold of them.
 191  */
 192 void __init omapfb_reserve_sdram_memblock(void)
 193 {
 194         unsigned long reserved = 0;
 195         int i;
 196
 197         if (config_invalid)
 198                 return;
 199
 200         for (i = 0; ; i++) {
 201                 struct omapfb_mem_region rg;
 202
 203                 if (get_fbmem_region(i, &rg) < 0)
 204                         break;
 205
 206                 if (i == OMAPFB_PLANE_NUM) {
 207                         pr_err("Extraneous FB mem configuration entries\n");
 208                         config_invalid = 1;
 209                         return;
 210                 }
 211
 212                 /* Check if it's our memory type. */
 213                 if (rg.type != OMAPFB_MEMTYPE_SDRAM)
 214                         continue;
 215
 216                 /* Check if the region falls within SDRAM */
 217                 if (rg.paddr && !valid_sdram(rg.paddr, rg.size))
 218                         continue;
 219
 220                 if (rg.size == 0) {
 221                         pr_err("Zero size for FB region %d\n", i);
 222                         config_invalid = 1;
 223                         return;
 224                 }
 225
 226                 if (rg.paddr) {
 227                         if (reserve_sdram(rg.paddr, rg.size)) {
 228                                 pr_err("Trying to use reserved memory for FB region %d\n",
 229                                         i);
 230                                 config_invalid = 1;
 231                                 return;
 232                         }
 233                         reserved += rg.size;
 234                 }
 235
 236                 if (omapfb_config.mem_desc.region[i].size) {
 237                         pr_err("FB region %d already set\n", i);
 238                         config_invalid = 1;
 239                         return;
 240                 }
 241
 242                 omapfb_config.mem_desc.region[i] = rg;
 243                 configured_regions++;
 244         }
 245         omapfb_config.mem_desc.region_cnt = i;
 246         if (reserved)
 247                 pr_info("Reserving %lu bytes SDRAM for frame buffer\n",
 248                          reserved);
 249 }
 250
 251 /*
 252  * Called at sram init time, before anything is pushed to the SRAM stack.
 253  * Because of the stack scheme, we will allocate everything from the
 254  * start of the lowest address region to the end of SRAM. This will also
 255  * include padding for page alignment and possible holes between regions.
 256  *
 257  * As opposed to the SDRAM case, we'll also do any dynamic allocations at
 258  * this point, since the driver built as a module would have problem with
 259  * freeing / reallocating the regions.
 260  */
 261 unsigned long omapfb_reserve_sram(unsigned long sram_pstart,
 262                                   unsigned long sram_vstart,
 263                                   unsigned long sram_size,
 264                                   unsigned long pstart_avail,
 265                                   unsigned long size_avail)
 266 {
 267         struct omapfb_mem_region        rg;
 268         unsigned long                   pend_avail;
 269         unsigned long                   reserved;
 270         int                             i;
 271
 272         if (config_invalid)
 273                 return 0;
 274
 275         reserved = 0;
 276         pend_avail = pstart_avail + size_avail;
 277         for (i = 0; ; i++) {
 278                 if (get_fbmem_region(i, &rg) < 0)
 279                         break;
 280                 if (i == OMAPFB_PLANE_NUM) {
 281                         printk(KERN_ERR
 282                                 "Extraneous FB mem configuration entries\n");
 283                         config_invalid = 1;
 284                         return 0;
 285                 }
 286
 287                 /* Check if it's our memory type. */
 288                 if (set_fbmem_region_type(&rg, OMAPFB_MEMTYPE_SRAM,
 289                                           sram_pstart, sram_size) < 0 ||
 290                     (rg.type != OMAPFB_MEMTYPE_SRAM))
 291                         continue;
 292                 BUG_ON(omapfb_config.mem_desc.region[i].size);
 293
 294                 if (check_fbmem_region(i, &rg, pstart_avail, size_avail) < 0) {
 295                         config_invalid = 1;
 296                         return 0;
 297                 }
 298
 299                 if (!rg.paddr) {
 300                         /* Dynamic allocation */
 301                         if ((size_avail & PAGE_MASK) < rg.size) {
 302                                 printk("Not enough SRAM for FB region %d\n",
 303                                         i);
 304                                 config_invalid = 1;
 305                                 return 0;
 306                         }
 307                         size_avail = (size_avail - rg.size) & PAGE_MASK;
 308                         rg.paddr = pstart_avail + size_avail;
 309                 }
 310                 /* Reserve everything above the start of the region. */
 311                 if (pend_avail - rg.paddr > reserved)
 312                         reserved = pend_avail - rg.paddr;
 313                 size_avail = pend_avail - reserved - pstart_avail;
 314
 315                 /*
 316                  * We have a kernel mapping for this already, so the
 317                  * driver won't have to make one.
 318                  */
 319                 rg.vaddr = (void *)(sram_vstart + rg.paddr - sram_pstart);
 320                 omapfb_config.mem_desc.region[i] = rg;
 321                 configured_regions++;
 322         }
 323         omapfb_config.mem_desc.region_cnt = i;
 324         if (reserved)
 325                 pr_info("Reserving %lu bytes SRAM for frame buffer\n",
 326                          reserved);
 327         return reserved;
 328 }
 329
 330 void omapfb_set_ctrl_platform_data(void *data)
 331 {
 332         omapfb_config.ctrl_platform_data = data;
 333 }
 334
 335 static inline int omap_init_fb(void)
 336 {
 337         const struct omap_lcd_config *conf;
 338
 339         if (config_invalid)
 340                 return 0;
 341         if (configured_regions != omapfb_config.mem_desc.region_cnt) {
 342                 printk(KERN_ERR "Invalid FB mem configuration entries\n");
 343                 return 0;
 344         }
 345         conf = omap_get_config(OMAP_TAG_LCD, struct omap_lcd_config);
 346         if (conf == NULL) {
 347                 if (configured_regions)
 348                         /* FB mem config, but no LCD config? */
 349                         printk(KERN_ERR "Missing LCD configuration\n");
 350                 return 0;
 351         }
 352         omapfb_config.lcd = *conf;
 353
 354         return platform_device_register(&omap_fb_device);
 355 }
 356
 357 arch_initcall(omap_init_fb);
 358
 359 #elif defined(CONFIG_FB_OMAP2) || defined(CONFIG_FB_OMAP2_MODULE)
 360
 361 static u64 omap_fb_dma_mask = ~(u32)0;
 362 static struct omapfb_platform_data omapfb_config;
 363
 364 static struct platform_device omap_fb_device = {
 365         .name           = "omapfb",
 366         .id             = -1,
 367         .dev = {
 368                 .dma_mask               = &omap_fb_dma_mask,
 369                 .coherent_dma_mask      = ~(u32)0,
 370                 .platform_data          = &omapfb_config,
 371         },
 372         .num_resources = 0,
 373 };
 374
 375 void omapfb_set_platform_data(struct omapfb_platform_data *data)
 376 {
 377         omapfb_config = *data;
 378 }
 379
 380 static inline int omap_init_fb(void)
 381 {
 382         return platform_device_register(&omap_fb_device);
 383 }
 384
 385 arch_initcall(omap_init_fb);
 386
 387 void omapfb_reserve_sdram_memblock(void)
 388 {
 389 }
 390
 391 unsigned long omapfb_reserve_sram(unsigned long sram_pstart,
 392                                   unsigned long sram_vstart,
 393                                   unsigned long sram_size,
 394                                   unsigned long start_avail,
 395                                   unsigned long size_avail)
 396 {
 397         return 0;
 398 }
 399
 400 #else
 401
 402 void omapfb_set_platform_data(struct omapfb_platform_data *data)
 403 {
 404 }
 405
 406 void omapfb_reserve_sdram_memblock(void)
 407 {
 408 }
 409
 410 unsigned long omapfb_reserve_sram(unsigned long sram_pstart,
 411                                   unsigned long sram_vstart,
 412                                   unsigned long sram_size,
 413                                   unsigned long start_avail,
 414                                   unsigned long size_avail)
 415 {
 416         return 0;
 417 }
 418
 419 #endif