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 #include "fb.h"
  40
  41 #if defined(CONFIG_FB_OMAP) || defined(CONFIG_FB_OMAP_MODULE)
  42
  43 static struct omapfb_platform_data omapfb_config;
  44 static int config_invalid;
  45 static int configured_regions;
  46
  47 static u64 omap_fb_dma_mask = ~(u32)0;
  48
  49 static struct platform_device omap_fb_device = {
  50         .name           = "omapfb",
  51         .id             = -1,
  52         .dev = {
  53                 .dma_mask               = &omap_fb_dma_mask,
  54                 .coherent_dma_mask      = ~(u32)0,
  55                 .platform_data          = &omapfb_config,
  56         },
  57         .num_resources = 0,
  58 };
  59
  60 void omapfb_set_platform_data(struct omapfb_platform_data *data)
  61 {
  62 }
  63
  64 static inline int ranges_overlap(unsigned long start1, unsigned long size1,
  65                                  unsigned long start2, unsigned long size2)
  66 {
  67         return (start1 >= start2 && start1 < start2 + size2) ||
  68                (start2 >= start1 && start2 < start1 + size1);
  69 }
  70
  71 static inline int range_included(unsigned long start1, unsigned long size1,
  72                                  unsigned long start2, unsigned long size2)
  73 {
  74         return start1 >= start2 && start1 + size1 <= start2 + size2;
  75 }
  76
  77
  78 /* Check if there is an overlapping region. */
  79 static int fbmem_region_reserved(unsigned long start, size_t size)
  80 {
  81         struct omapfb_mem_region *rg;
  82         int i;
  83
  84         rg = &omapfb_config.mem_desc.region[0];
  85         for (i = 0; i < OMAPFB_PLANE_NUM; i++, rg++) {
  86                 if (!rg->paddr)
  87                         /* Empty slot. */
  88                         continue;
  89                 if (ranges_overlap(start, size, rg->paddr, rg->size))
  90                         return 1;
  91         }
  92         return 0;
  93 }
  94
  95 /*
  96  * Get the region_idx`th region from board config/ATAG and convert it to
  97  * our internal format.
  98  */
  99 static int get_fbmem_region(int region_idx, struct omapfb_mem_region *rg)
 100 {
 101         const struct omap_fbmem_config  *conf;
 102         u32                             paddr;
 103
 104         conf = omap_get_nr_config(OMAP_TAG_FBMEM,
 105                                   struct omap_fbmem_config, region_idx);
 106         if (conf == NULL)
 107                 return -ENOENT;
 108
 109         paddr = conf->start;
 110         /*
 111          * Low bits encode the page allocation mode, if high bits
 112          * are zero. Otherwise we need a page aligned fixed
 113          * address.
 114          */
 115         memset(rg, 0, sizeof(*rg));
 116         rg->type = paddr & ~PAGE_MASK;
 117         rg->paddr = paddr & PAGE_MASK;
 118         rg->size = PAGE_ALIGN(conf->size);
 119         return 0;
 120 }
 121
 122 static int set_fbmem_region_type(struct omapfb_mem_region *rg, int mem_type,
 123                                   unsigned long mem_start,
 124                                   unsigned long mem_size)
 125 {
 126         /*
 127          * Check if the configuration specifies the type explicitly.
 128          * type = 0 && paddr = 0, a default don't care case maps to
 129          * the SDRAM type.
 130          */
 131         if (rg->type || (!rg->type && !rg->paddr))
 132                 return 0;
 133         if (ranges_overlap(rg->paddr, rg->size, mem_start, mem_size)) {
 134                 rg->type = mem_type;
 135                 return 0;
 136         }
 137         /* Can't determine it. */
 138         return -1;
 139 }
 140
 141 static int check_fbmem_region(int region_idx, struct omapfb_mem_region *rg,
 142                               unsigned long start_avail, unsigned size_avail)
 143 {
 144         unsigned long   paddr = rg->paddr;
 145         size_t          size = rg->size;
 146
 147         if (rg->type > OMAPFB_MEMTYPE_MAX) {
 148                 printk(KERN_ERR
 149                         "Invalid start address for FB region %d\n", region_idx);
 150                 return -EINVAL;
 151         }
 152
 153         if (!rg->size) {
 154                 printk(KERN_ERR "Zero size for FB region %d\n", region_idx);
 155                 return -EINVAL;
 156         }
 157
 158         if (!paddr)
 159                 /* Allocate this dynamically, leave paddr 0 for now. */
 160                 return 0;
 161
 162         /*
 163          * Fixed region for the given RAM range. Check if it's already
 164          * reserved by the FB code or someone else.
 165          */
 166         if (fbmem_region_reserved(paddr, size) ||
 167             !range_included(paddr, size, start_avail, size_avail)) {
 168                 printk(KERN_ERR "Trying to use reserved memory "
 169                         "for FB region %d\n", region_idx);
 170                 return -EINVAL;
 171         }
 172
 173         return 0;
 174 }
 175
 176 static int valid_sdram(unsigned long addr, unsigned long size)
 177 {
 178         struct memblock_property res;
 179
 180         res.base = addr;
 181         res.size = size;
 182         return !memblock_find(&res) && res.base == addr && res.size == size;
 183 }
 184
 185 static int reserve_sdram(unsigned long addr, unsigned long size)
 186 {
 187         if (memblock_is_region_reserved(addr, size))
 188                 return -EBUSY;
 189         if (memblock_reserve(addr, size))
 190                 return -ENOMEM;
 191         return 0;
 192 }
 193
 194 /*
 195  * Called from map_io. We need to call to this early enough so that we
 196  * can reserve the fixed SDRAM regions before VM could get hold of them.
 197  */
 198 void __init omapfb_reserve_sdram_memblock(void)
 199 {
 200         unsigned long reserved = 0;
 201         int i;
 202
 203         if (config_invalid)
 204                 return;
 205
 206         for (i = 0; ; i++) {
 207                 struct omapfb_mem_region rg;
 208
 209                 if (get_fbmem_region(i, &rg) < 0)
 210                         break;
 211
 212                 if (i == OMAPFB_PLANE_NUM) {
 213                         pr_err("Extraneous FB mem configuration entries\n");
 214                         config_invalid = 1;
 215                         return;
 216                 }
 217
 218                 /* Check if it's our memory type. */
 219                 if (rg.type != OMAPFB_MEMTYPE_SDRAM)
 220                         continue;
 221
 222                 /* Check if the region falls within SDRAM */
 223                 if (rg.paddr && !valid_sdram(rg.paddr, rg.size))
 224                         continue;
 225
 226                 if (rg.size == 0) {
 227                         pr_err("Zero size for FB region %d\n", i);
 228                         config_invalid = 1;
 229                         return;
 230                 }
 231
 232                 if (rg.paddr) {
 233                         if (reserve_sdram(rg.paddr, rg.size)) {
 234                                 pr_err("Trying to use reserved memory for FB region %d\n",
 235                                         i);
 236                                 config_invalid = 1;
 237                                 return;
 238                         }
 239                         reserved += rg.size;
 240                 }
 241
 242                 if (omapfb_config.mem_desc.region[i].size) {
 243                         pr_err("FB region %d already set\n", i);
 244                         config_invalid = 1;
 245                         return;
 246                 }
 247
 248                 omapfb_config.mem_desc.region[i] = rg;
 249                 configured_regions++;
 250         }
 251         omapfb_config.mem_desc.region_cnt = i;
 252         if (reserved)
 253                 pr_info("Reserving %lu bytes SDRAM for frame buffer\n",
 254                          reserved);
 255 }
 256
 257 /*
 258  * Called at sram init time, before anything is pushed to the SRAM stack.
 259  * Because of the stack scheme, we will allocate everything from the
 260  * start of the lowest address region to the end of SRAM. This will also
 261  * include padding for page alignment and possible holes between regions.
 262  *
 263  * As opposed to the SDRAM case, we'll also do any dynamic allocations at
 264  * this point, since the driver built as a module would have problem with
 265  * freeing / reallocating the regions.
 266  */
 267 unsigned long omapfb_reserve_sram(unsigned long sram_pstart,
 268                                   unsigned long sram_vstart,
 269                                   unsigned long sram_size,
 270                                   unsigned long pstart_avail,
 271                                   unsigned long size_avail)
 272 {
 273         struct omapfb_mem_region        rg;
 274         unsigned long                   pend_avail;
 275         unsigned long                   reserved;
 276         int                             i;
 277
 278         if (config_invalid)
 279                 return 0;
 280
 281         reserved = 0;
 282         pend_avail = pstart_avail + size_avail;
 283         for (i = 0; ; i++) {
 284                 if (get_fbmem_region(i, &rg) < 0)
 285                         break;
 286                 if (i == OMAPFB_PLANE_NUM) {
 287                         printk(KERN_ERR
 288                                 "Extraneous FB mem configuration entries\n");
 289                         config_invalid = 1;
 290                         return 0;
 291                 }
 292
 293                 /* Check if it's our memory type. */
 294                 if (set_fbmem_region_type(&rg, OMAPFB_MEMTYPE_SRAM,
 295                                           sram_pstart, sram_size) < 0 ||
 296                     (rg.type != OMAPFB_MEMTYPE_SRAM))
 297                         continue;
 298                 BUG_ON(omapfb_config.mem_desc.region[i].size);
 299
 300                 if (check_fbmem_region(i, &rg, pstart_avail, size_avail) < 0) {
 301                         config_invalid = 1;
 302                         return 0;
 303                 }
 304
 305                 if (!rg.paddr) {
 306                         /* Dynamic allocation */
 307                         if ((size_avail & PAGE_MASK) < rg.size) {
 308                                 printk("Not enough SRAM for FB region %d\n",
 309                                         i);
 310                                 config_invalid = 1;
 311                                 return 0;
 312                         }
 313                         size_avail = (size_avail - rg.size) & PAGE_MASK;
 314                         rg.paddr = pstart_avail + size_avail;
 315                 }
 316                 /* Reserve everything above the start of the region. */
 317                 if (pend_avail - rg.paddr > reserved)
 318                         reserved = pend_avail - rg.paddr;
 319                 size_avail = pend_avail - reserved - pstart_avail;
 320
 321                 /*
 322                  * We have a kernel mapping for this already, so the
 323                  * driver won't have to make one.
 324                  */
 325                 rg.vaddr = (void *)(sram_vstart + rg.paddr - sram_pstart);
 326                 omapfb_config.mem_desc.region[i] = rg;
 327                 configured_regions++;
 328         }
 329         omapfb_config.mem_desc.region_cnt = i;
 330         if (reserved)
 331                 pr_info("Reserving %lu bytes SRAM for frame buffer\n",
 332                          reserved);
 333         return reserved;
 334 }
 335
 336 void omapfb_set_ctrl_platform_data(void *data)
 337 {
 338         omapfb_config.ctrl_platform_data = data;
 339 }
 340
 341 static inline int omap_init_fb(void)
 342 {
 343         const struct omap_lcd_config *conf;
 344
 345         if (config_invalid)
 346                 return 0;
 347         if (configured_regions != omapfb_config.mem_desc.region_cnt) {
 348                 printk(KERN_ERR "Invalid FB mem configuration entries\n");
 349                 return 0;
 350         }
 351         conf = omap_get_config(OMAP_TAG_LCD, struct omap_lcd_config);
 352         if (conf == NULL) {
 353                 if (configured_regions)
 354                         /* FB mem config, but no LCD config? */
 355                         printk(KERN_ERR "Missing LCD configuration\n");
 356                 return 0;
 357         }
 358         omapfb_config.lcd = *conf;
 359
 360         return platform_device_register(&omap_fb_device);
 361 }
 362
 363 arch_initcall(omap_init_fb);
 364
 365 #elif defined(CONFIG_FB_OMAP2) || defined(CONFIG_FB_OMAP2_MODULE)
 366
 367 static u64 omap_fb_dma_mask = ~(u32)0;
 368 static struct omapfb_platform_data omapfb_config;
 369
 370 static struct platform_device omap_fb_device = {
 371         .name           = "omapfb",
 372         .id             = -1,
 373         .dev = {
 374                 .dma_mask               = &omap_fb_dma_mask,
 375                 .coherent_dma_mask      = ~(u32)0,
 376                 .platform_data          = &omapfb_config,
 377         },
 378         .num_resources = 0,
 379 };
 380
 381 void omapfb_set_platform_data(struct omapfb_platform_data *data)
 382 {
 383         omapfb_config = *data;
 384 }
 385
 386 static inline int omap_init_fb(void)
 387 {
 388         return platform_device_register(&omap_fb_device);
 389 }
 390
 391 arch_initcall(omap_init_fb);
 392
 393 void omapfb_reserve_sdram_memblock(void)
 394 {
 395 }
 396
 397 unsigned long omapfb_reserve_sram(unsigned long sram_pstart,
 398                                   unsigned long sram_vstart,
 399                                   unsigned long sram_size,
 400                                   unsigned long start_avail,
 401                                   unsigned long size_avail)
 402 {
 403         return 0;
 404 }
 405
 406 #else
 407
 408 void omapfb_set_platform_data(struct omapfb_platform_data *data)
 409 {
 410 }
 411
 412 void omapfb_reserve_sdram_memblock(void)
 413 {
 414 }
 415
 416 unsigned long omapfb_reserve_sram(unsigned long sram_pstart,
 417                                   unsigned long sram_vstart,
 418                                   unsigned long sram_size,
 419                                   unsigned long start_avail,
 420                                   unsigned long size_avail)
 421 {
 422         return 0;
 423 }
 424
 425 #endif