drivers/char/zr36120_mem.c

   1 /*
   2     zr36120_mem.c - Zoran 36120/36125 based framegrabbers
   3
   4     Copyright (C) 1998-1999 Pauline Middelink <middelin@polyware.nl>
   5
   6     This program is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program; if not, write to the Free Software
  18     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 #include <linux/config.h>
  22 #include <linux/mm.h>
  23 #include <linux/pci.h>
  24 #include <linux/wrapper.h>
  25 #include <linux/slab.h>
  26 #include <asm/io.h>
  27 #ifdef CONFIG_BIGPHYS_AREA
  28 #include <linux/bigphysarea.h>
  29 #endif
  30
  31 #include "zr36120.h"
  32 #include "zr36120_mem.h"
  33
  34 /*******************************/
  35 /* Memory management functions */
  36 /*******************************/
  37
  38 void* bmalloc(unsigned long size)
  39 {
  40         void* mem;
  41 #ifdef CONFIG_BIGPHYS_AREA
  42         mem = bigphysarea_alloc_pages(size/PAGE_SIZE, 1, GFP_KERNEL);
  43 #else
  44         /*
  45          * The following function got a lot of memory at boottime,
  46          * so we know its always there...
  47          */
  48         mem = (void*)__get_free_pages(GFP_USER|GFP_DMA,get_order(size));
  49 #endif
  50         if (mem) {
  51                 unsigned long adr = (unsigned long)mem;
  52                 while (size > 0) {
  53                         mem_map_reserve(MAP_NR(phys_to_virt(adr)));
  54                         adr += PAGE_SIZE;
  55                         size -= PAGE_SIZE;
  56                 }
  57         }
  58         return mem;
  59 }
  60
  61 void bfree(void* mem, unsigned long size)
  62 {
  63         if (mem) {
  64                 unsigned long adr = (unsigned long)mem;
  65                 unsigned long siz = size;
  66                 while (siz > 0) {
  67                         mem_map_unreserve(MAP_NR(phys_to_virt(adr)));
  68                         adr += PAGE_SIZE;
  69                         siz -= PAGE_SIZE;
  70                 }
  71 #ifdef CONFIG_BIGPHYS_AREA
  72                 bigphysarea_free_pages(mem);
  73 #else
  74                 free_pages((unsigned long)mem,get_order(size));
  75 #endif
  76         }
  77 }