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Linux/arch/sh/mm/ioremap_fixed.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * Re-map IO memory to kernel address space so that we can access it.
  4  *
  5  * These functions should only be used when it is necessary to map a
  6  * physical address space into the kernel address space before ioremap()
  7  * can be used, e.g. early in boot before paging_init().
  8  *
  9  * Copyright (C) 2009  Matt Fleming
 10  */
 11 
 12 #include <linux/vmalloc.h>
 13 #include <linux/ioport.h>
 14 #include <linux/module.h>
 15 #include <linux/mm.h>
 16 #include <linux/io.h>
 17 #include <linux/bootmem.h>
 18 #include <linux/proc_fs.h>
 19 #include <asm/fixmap.h>
 20 #include <asm/page.h>
 21 #include <asm/pgalloc.h>
 22 #include <asm/addrspace.h>
 23 #include <asm/cacheflush.h>
 24 #include <asm/tlbflush.h>
 25 #include <asm/mmu.h>
 26 #include <asm/mmu_context.h>
 27 
 28 struct ioremap_map {
 29         void __iomem *addr;
 30         unsigned long size;
 31         unsigned long fixmap_addr;
 32 };
 33 
 34 static struct ioremap_map ioremap_maps[FIX_N_IOREMAPS];
 35 
 36 void __init ioremap_fixed_init(void)
 37 {
 38         struct ioremap_map *map;
 39         int i;
 40 
 41         for (i = 0; i < FIX_N_IOREMAPS; i++) {
 42                 map = &ioremap_maps[i];
 43                 map->fixmap_addr = __fix_to_virt(FIX_IOREMAP_BEGIN + i);
 44         }
 45 }
 46 
 47 void __init __iomem *
 48 ioremap_fixed(phys_addr_t phys_addr, unsigned long size, pgprot_t prot)
 49 {
 50         enum fixed_addresses idx0, idx;
 51         struct ioremap_map *map;
 52         unsigned int nrpages;
 53         unsigned long offset;
 54         int i, slot;
 55 
 56         /*
 57          * Mappings have to be page-aligned
 58          */
 59         offset = phys_addr & ~PAGE_MASK;
 60         phys_addr &= PAGE_MASK;
 61         size = PAGE_ALIGN(phys_addr + size) - phys_addr;
 62 
 63         slot = -1;
 64         for (i = 0; i < FIX_N_IOREMAPS; i++) {
 65                 map = &ioremap_maps[i];
 66                 if (!map->addr) {
 67                         map->size = size;
 68                         slot = i;
 69                         break;
 70                 }
 71         }
 72 
 73         if (slot < 0)
 74                 return NULL;
 75 
 76         /*
 77          * Mappings have to fit in the FIX_IOREMAP area.
 78          */
 79         nrpages = size >> PAGE_SHIFT;
 80         if (nrpages > FIX_N_IOREMAPS)
 81                 return NULL;
 82 
 83         /*
 84          * Ok, go for it..
 85          */
 86         idx0 = FIX_IOREMAP_BEGIN + slot;
 87         idx = idx0;
 88         while (nrpages > 0) {
 89                 pgprot_val(prot) |= _PAGE_WIRED;
 90                 __set_fixmap(idx, phys_addr, prot);
 91                 phys_addr += PAGE_SIZE;
 92                 idx++;
 93                 --nrpages;
 94         }
 95 
 96         map->addr = (void __iomem *)(offset + map->fixmap_addr);
 97         return map->addr;
 98 }
 99 
100 int iounmap_fixed(void __iomem *addr)
101 {
102         enum fixed_addresses idx;
103         struct ioremap_map *map;
104         unsigned int nrpages;
105         int i, slot;
106 
107         slot = -1;
108         for (i = 0; i < FIX_N_IOREMAPS; i++) {
109                 map = &ioremap_maps[i];
110                 if (map->addr == addr) {
111                         slot = i;
112                         break;
113                 }
114         }
115 
116         /*
117          * If we don't match, it's not for us.
118          */
119         if (slot < 0)
120                 return -EINVAL;
121 
122         nrpages = map->size >> PAGE_SHIFT;
123 
124         idx = FIX_IOREMAP_BEGIN + slot + nrpages - 1;
125         while (nrpages > 0) {
126                 __clear_fixmap(idx, __pgprot(_PAGE_WIRED));
127                 --idx;
128                 --nrpages;
129         }
130 
131         map->size = 0;
132         map->addr = NULL;
133 
134         return 0;
135 }
136 

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