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         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
 183 static 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  */
 196 void __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  */
 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)
 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
 334 void omapfb_set_ctrl_platform_data(void *data)
 335 {
 336         omapfb_config.ctrl_platform_data = data;
 337 }
 338
 339 static 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
 361 arch_initcall(omap_init_fb);
 362
 363 #elif defined(CONFIG_FB_OMAP2) || defined(CONFIG_FB_OMAP2_MODULE)
 364
 365 static u64 omap_fb_dma_mask = ~(u32)0;
 366 static struct omapfb_platform_data omapfb_config;
 367
 368 static 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
 379 void omapfb_set_platform_data(struct omapfb_platform_data *data)
 380 {
 381         omapfb_config = *data;
 382 }
 383
 384 static inline int omap_init_fb(void)
 385 {
 386         return platform_device_register(&omap_fb_device);
 387 }
 388
 389 arch_initcall(omap_init_fb);
 390
 391 void omapfb_reserve_sdram_memblock(void)
 392 {
 393 }
 394
 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)
 400 {
 401         return 0;
 402 }
 403
 404 #else
 405
 406 void omapfb_set_platform_data(struct omapfb_platform_data *data)
 407 {
 408 }
 409
 410 void omapfb_reserve_sdram_memblock(void)
 411 {
 412 }
 413
 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)
 419 {
 420         return 0;
 421 }
 422
 423 #endif