~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/arch/arc/mm/ioremap.c

Version: ~ [ linux-5.13-rc1 ] ~ [ linux-5.12.2 ] ~ [ linux-5.11.19 ] ~ [ linux-5.10.35 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.117 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.190 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.232 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.268 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.268 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 void __iomem *ioremap(unsigned long paddr, unsigned long size)
 18 {
 19         unsigned long end;
 20 
 21         /* Don't allow wraparound or zero size */
 22         end = paddr + size - 1;
 23         if (!size || (end < paddr))
 24                 return NULL;
 25 
 26         /* If the region is h/w uncached, avoid MMU mappings */
 27         if (paddr >= ARC_UNCACHED_ADDR_SPACE)
 28                 return (void __iomem *)paddr;
 29 
 30         return ioremap_prot(paddr, size, PAGE_KERNEL_NO_CACHE);
 31 }
 32 EXPORT_SYMBOL(ioremap);
 33 
 34 /*
 35  * ioremap with access flags
 36  * Cache semantics wise it is same as ioremap - "forced" uncached.
 37  * However unline vanilla ioremap which bypasses ARC MMU for addresses in
 38  * ARC hardware uncached region, this one still goes thru the MMU as caller
 39  * might need finer access control (R/W/X)
 40  */
 41 void __iomem *ioremap_prot(phys_addr_t paddr, unsigned long size,
 42                            unsigned long flags)
 43 {
 44         void __iomem *vaddr;
 45         struct vm_struct *area;
 46         unsigned long off, end;
 47         pgprot_t prot = __pgprot(flags);
 48 
 49         /* Don't allow wraparound, zero size */
 50         end = paddr + size - 1;
 51         if ((!size) || (end < paddr))
 52                 return NULL;
 53 
 54         /* An early platform driver might end up here */
 55         if (!slab_is_available())
 56                 return NULL;
 57 
 58         /* force uncached */
 59         prot = pgprot_noncached(prot);
 60 
 61         /* Mappings have to be page-aligned */
 62         off = paddr & ~PAGE_MASK;
 63         paddr &= PAGE_MASK;
 64         size = PAGE_ALIGN(end + 1) - paddr;
 65 
 66         /*
 67          * Ok, go for it..
 68          */
 69         area = get_vm_area(size, VM_IOREMAP);
 70         if (!area)
 71                 return NULL;
 72         area->phys_addr = paddr;
 73         vaddr = (void __iomem *)area->addr;
 74         if (ioremap_page_range((unsigned long)vaddr,
 75                                (unsigned long)vaddr + size, paddr, prot)) {
 76                 vunmap((void __force *)vaddr);
 77                 return NULL;
 78         }
 79         return (void __iomem *)(off + (char __iomem *)vaddr);
 80 }
 81 EXPORT_SYMBOL(ioremap_prot);
 82 
 83 
 84 void iounmap(const void __iomem *addr)
 85 {
 86         if (addr >= (void __force __iomem *)ARC_UNCACHED_ADDR_SPACE)
 87                 return;
 88 
 89         vfree((void *)(PAGE_MASK & (unsigned long __force)addr));
 90 }
 91 EXPORT_SYMBOL(iounmap);
 92 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp