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