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Linux/arch/sh/mm/ioremap_fixed.c

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  1 /*
  2  * Re-map IO memory to kernel address space so that we can access it.
  3  *
  4  * These functions should only be used when it is necessary to map a
  5  * physical address space into the kernel address space before ioremap()
  6  * can be used, e.g. early in boot before paging_init().
  7  *
  8  * Copyright (C) 2009  Matt Fleming
  9  */
 10 
 11 #include <linux/vmalloc.h>
 12 #include <linux/ioport.h>
 13 #include <linux/module.h>
 14 #include <linux/mm.h>
 15 #include <linux/io.h>
 16 #include <linux/bootmem.h>
 17 #include <linux/proc_fs.h>
 18 #include <asm/fixmap.h>
 19 #include <asm/page.h>
 20 #include <asm/pgalloc.h>
 21 #include <asm/addrspace.h>
 22 #include <asm/cacheflush.h>
 23 #include <asm/tlbflush.h>
 24 #include <asm/mmu.h>
 25 #include <asm/mmu_context.h>
 26 
 27 struct ioremap_map {
 28         void __iomem *addr;
 29         unsigned long size;
 30         unsigned long fixmap_addr;
 31 };
 32 
 33 static struct ioremap_map ioremap_maps[FIX_N_IOREMAPS];
 34 
 35 void __init ioremap_fixed_init(void)
 36 {
 37         struct ioremap_map *map;
 38         int i;
 39 
 40         for (i = 0; i < FIX_N_IOREMAPS; i++) {
 41                 map = &ioremap_maps[i];
 42                 map->fixmap_addr = __fix_to_virt(FIX_IOREMAP_BEGIN + i);
 43         }
 44 }
 45 
 46 void __init __iomem *
 47 ioremap_fixed(phys_addr_t phys_addr, unsigned long size, pgprot_t prot)
 48 {
 49         enum fixed_addresses idx0, idx;
 50         struct ioremap_map *map;
 51         unsigned int nrpages;
 52         unsigned long offset;
 53         int i, slot;
 54 
 55         /*
 56          * Mappings have to be page-aligned
 57          */
 58         offset = phys_addr & ~PAGE_MASK;
 59         phys_addr &= PAGE_MASK;
 60         size = PAGE_ALIGN(phys_addr + size) - phys_addr;
 61 
 62         slot = -1;
 63         for (i = 0; i < FIX_N_IOREMAPS; i++) {
 64                 map = &ioremap_maps[i];
 65                 if (!map->addr) {
 66                         map->size = size;
 67                         slot = i;
 68                         break;
 69                 }
 70         }
 71 
 72         if (slot < 0)
 73                 return NULL;
 74 
 75         /*
 76          * Mappings have to fit in the FIX_IOREMAP area.
 77          */
 78         nrpages = size >> PAGE_SHIFT;
 79         if (nrpages > FIX_N_IOREMAPS)
 80                 return NULL;
 81 
 82         /*
 83          * Ok, go for it..
 84          */
 85         idx0 = FIX_IOREMAP_BEGIN + slot;
 86         idx = idx0;
 87         while (nrpages > 0) {
 88                 pgprot_val(prot) |= _PAGE_WIRED;
 89                 __set_fixmap(idx, phys_addr, prot);
 90                 phys_addr += PAGE_SIZE;
 91                 idx++;
 92                 --nrpages;
 93         }
 94 
 95         map->addr = (void __iomem *)(offset + map->fixmap_addr);
 96         return map->addr;
 97 }
 98 
 99 int iounmap_fixed(void __iomem *addr)
100 {
101         enum fixed_addresses idx;
102         struct ioremap_map *map;
103         unsigned int nrpages;
104         int i, slot;
105 
106         slot = -1;
107         for (i = 0; i < FIX_N_IOREMAPS; i++) {
108                 map = &ioremap_maps[i];
109                 if (map->addr == addr) {
110                         slot = i;
111                         break;
112                 }
113         }
114 
115         /*
116          * If we don't match, it's not for us.
117          */
118         if (slot < 0)
119                 return -EINVAL;
120 
121         nrpages = map->size >> PAGE_SHIFT;
122 
123         idx = FIX_IOREMAP_BEGIN + slot + nrpages - 1;
124         while (nrpages > 0) {
125                 __clear_fixmap(idx, __pgprot(_PAGE_WIRED));
126                 --idx;
127                 --nrpages;
128         }
129 
130         map->size = 0;
131         map->addr = NULL;
132 
133         return 0;
134 }
135 

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