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Linux/arch/arc/mm/ioremap.c

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  1 /*
  2  * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
  3  *
  4  * This program is free software; you can redistribute it and/or modify
  5  * it under the terms of the GNU General Public License version 2 as
  6  * published by the Free Software Foundation.
  7  */
  8 
  9 #include <linux/vmalloc.h>
 10 #include <linux/init.h>
 11 #include <linux/module.h>
 12 #include <linux/io.h>
 13 #include <linux/mm.h>
 14 #include <linux/slab.h>
 15 #include <linux/cache.h>
 16 
 17 static inline bool arc_uncached_addr_space(phys_addr_t paddr)
 18 {
 19         if (is_isa_arcompact()) {
 20                 if (paddr >= ARC_UNCACHED_ADDR_SPACE)
 21                         return true;
 22         } else if (paddr >= perip_base && paddr <= perip_end) {
 23                 return true;
 24         }
 25 
 26         return false;
 27 }
 28 
 29 void __iomem *ioremap(phys_addr_t paddr, unsigned long size)
 30 {
 31         phys_addr_t end;
 32 
 33         /* Don't allow wraparound or zero size */
 34         end = paddr + size - 1;
 35         if (!size || (end < paddr))
 36                 return NULL;
 37 
 38         /*
 39          * If the region is h/w uncached, MMU mapping can be elided as optim
 40          * The cast to u32 is fine as this region can only be inside 4GB
 41          */
 42         if (arc_uncached_addr_space(paddr))
 43                 return (void __iomem *)(u32)paddr;
 44 
 45         return ioremap_prot(paddr, size, PAGE_KERNEL_NO_CACHE);
 46 }
 47 EXPORT_SYMBOL(ioremap);
 48 
 49 /*
 50  * ioremap with access flags
 51  * Cache semantics wise it is same as ioremap - "forced" uncached.
 52  * However unlike vanilla ioremap which bypasses ARC MMU for addresses in
 53  * ARC hardware uncached region, this one still goes thru the MMU as caller
 54  * might need finer access control (R/W/X)
 55  */
 56 void __iomem *ioremap_prot(phys_addr_t paddr, unsigned long size,
 57                            unsigned long flags)
 58 {
 59         unsigned long vaddr;
 60         struct vm_struct *area;
 61         phys_addr_t off, end;
 62         pgprot_t prot = __pgprot(flags);
 63 
 64         /* Don't allow wraparound, zero size */
 65         end = paddr + size - 1;
 66         if ((!size) || (end < paddr))
 67                 return NULL;
 68 
 69         /* An early platform driver might end up here */
 70         if (!slab_is_available())
 71                 return NULL;
 72 
 73         /* force uncached */
 74         prot = pgprot_noncached(prot);
 75 
 76         /* Mappings have to be page-aligned */
 77         off = paddr & ~PAGE_MASK;
 78         paddr &= PAGE_MASK;
 79         size = PAGE_ALIGN(end + 1) - paddr;
 80 
 81         /*
 82          * Ok, go for it..
 83          */
 84         area = get_vm_area(size, VM_IOREMAP);
 85         if (!area)
 86                 return NULL;
 87         area->phys_addr = paddr;
 88         vaddr = (unsigned long)area->addr;
 89         if (ioremap_page_range(vaddr, vaddr + size, paddr, prot)) {
 90                 vunmap((void __force *)vaddr);
 91                 return NULL;
 92         }
 93         return (void __iomem *)(off + (char __iomem *)vaddr);
 94 }
 95 EXPORT_SYMBOL(ioremap_prot);
 96 
 97 
 98 void iounmap(const void __iomem *addr)
 99 {
100         /* weird double cast to handle phys_addr_t > 32 bits */
101         if (arc_uncached_addr_space((phys_addr_t)(u32)addr))
102                 return;
103 
104         vfree((void *)(PAGE_MASK & (unsigned long __force)addr));
105 }
106 EXPORT_SYMBOL(iounmap);
107 

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