arch/m68k/amiga/chipram.c

   1 /*
   2 **  linux/amiga/chipram.c
   3 **
   4 **      Modified 03-May-94 by Geert Uytterhoeven <geert@linux-m68k.org>
   5 **          - 64-bit aligned allocations for full AGA compatibility
   6 **
   7 **      Rewritten 15/9/2000 by Geert to use resource management
   8 */
   9
  10 #include <linux/types.h>
  11 #include <linux/kernel.h>
  12 #include <linux/mm.h>
  13 #include <linux/init.h>
  14 #include <linux/ioport.h>
  15 #include <linux/slab.h>
  16 #include <linux/string.h>
  17 #include <linux/module.h>
  18
  19 #include <asm/page.h>
  20 #include <asm/amigahw.h>
  21
  22 unsigned long amiga_chip_size;
  23 EXPORT_SYMBOL(amiga_chip_size);
  24
  25 static struct resource chipram_res = {
  26     .name = "Chip RAM", .start = CHIP_PHYSADDR
  27 };
  28 static unsigned long chipavail;
  29
  30
  31 void __init amiga_chip_init(void)
  32 {
  33     if (!AMIGAHW_PRESENT(CHIP_RAM))
  34         return;
  35
  36     chipram_res.end = amiga_chip_size-1;
  37     request_resource(&iomem_resource, &chipram_res);
  38
  39     chipavail = amiga_chip_size;
  40 }
  41
  42
  43 void *amiga_chip_alloc(unsigned long size, const char *name)
  44 {
  45     struct resource *res;
  46
  47     /* round up */
  48     size = PAGE_ALIGN(size);
  49
  50 #ifdef DEBUG
  51     printk("amiga_chip_alloc: allocate %ld bytes\n", size);
  52 #endif
  53     res = kzalloc(sizeof(struct resource), GFP_KERNEL);
  54     if (!res)
  55         return NULL;
  56     res->name = name;
  57
  58     if (allocate_resource(&chipram_res, res, size, 0, UINT_MAX, PAGE_SIZE, NULL, NULL) < 0) {
  59         kfree(res);
  60         return NULL;
  61     }
  62     chipavail -= size;
  63 #ifdef DEBUG
  64     printk("amiga_chip_alloc: returning %lx\n", res->start);
  65 #endif
  66     return (void *)ZTWO_VADDR(res->start);
  67 }
  68 EXPORT_SYMBOL(amiga_chip_alloc);
  69
  70
  71     /*
  72      *  Warning:
  73      *  amiga_chip_alloc_res is meant only for drivers that need to allocate
  74      *  Chip RAM before kmalloc() is functional. As a consequence, those
  75      *  drivers must not free that Chip RAM afterwards.
  76      */
  77
  78 void * __init amiga_chip_alloc_res(unsigned long size, struct resource *res)
  79 {
  80     unsigned long start;
  81
  82     /* round up */
  83     size = PAGE_ALIGN(size);
  84     /* dmesg into chipmem prefers memory at the safe end */
  85     start = CHIP_PHYSADDR + chipavail - size;
  86
  87 #ifdef DEBUG
  88     printk("amiga_chip_alloc_res: allocate %ld bytes\n", size);
  89 #endif
  90     if (allocate_resource(&chipram_res, res, size, start, UINT_MAX, PAGE_SIZE, NULL, NULL) < 0) {
  91         printk("amiga_chip_alloc_res: first alloc failed!\n");
  92         if (allocate_resource(&chipram_res, res, size, 0, UINT_MAX, PAGE_SIZE, NULL, NULL) < 0)
  93             return NULL;
  94     }
  95     chipavail -= size;
  96 #ifdef DEBUG
  97     printk("amiga_chip_alloc_res: returning %lx\n", res->start);
  98 #endif
  99     return (void *)ZTWO_VADDR(res->start);
 100 }
 101
 102 void amiga_chip_free(void *ptr)
 103 {
 104     unsigned long start = ZTWO_PADDR(ptr);
 105     struct resource **p, *res;
 106     unsigned long size;
 107
 108     for (p = &chipram_res.child; (res = *p); p = &res->sibling) {
 109         if (res->start != start)
 110             continue;
 111         *p = res->sibling;
 112         size = res->end-start;
 113 #ifdef DEBUG
 114         printk("amiga_chip_free: free %ld bytes at %p\n", size, ptr);
 115 #endif
 116         chipavail += size;
 117         kfree(res);
 118         return;
 119     }
 120     printk("amiga_chip_free: trying to free nonexistent region at %p\n", ptr);
 121 }
 122 EXPORT_SYMBOL(amiga_chip_free);
 123
 124
 125 unsigned long amiga_chip_avail(void)
 126 {
 127 #ifdef DEBUG
 128         printk("amiga_chip_avail : %ld bytes\n", chipavail);
 129 #endif
 130         return chipavail;
 131 }
 132 EXPORT_SYMBOL(amiga_chip_avail);
 133