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Linux/arch/hexagon/mm/ioremap.c

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  1 /*
  2  * I/O remap functions for Hexagon
  3  *
  4  * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License version 2 and
  8  * only version 2 as published by the Free Software Foundation.
  9  *
 10  * This program is distributed in the hope that it will be useful,
 11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 13  * GNU General Public License for more details.
 14  *
 15  * You should have received a copy of the GNU General Public License
 16  * along with this program; if not, write to the Free Software
 17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 18  * 02110-1301, USA.
 19  */
 20 
 21 #include <linux/io.h>
 22 #include <linux/vmalloc.h>
 23 
 24 void __iomem *ioremap_nocache(unsigned long phys_addr, unsigned long size)
 25 {
 26         unsigned long last_addr, addr;
 27         unsigned long offset = phys_addr & ~PAGE_MASK;
 28         struct vm_struct *area;
 29 
 30         pgprot_t prot = __pgprot(_PAGE_PRESENT|_PAGE_READ|_PAGE_WRITE
 31                                         |(__HEXAGON_C_DEV << 6));
 32 
 33         last_addr = phys_addr + size - 1;
 34 
 35         /*  Wrapping not allowed  */
 36         if (!size || (last_addr < phys_addr))
 37                 return NULL;
 38 
 39         /*  Rounds up to next page size, including whole-page offset */
 40         size = PAGE_ALIGN(offset + size);
 41 
 42         area = get_vm_area(size, VM_IOREMAP);
 43         addr = (unsigned long)area->addr;
 44 
 45         if (ioremap_page_range(addr, addr+size, phys_addr, prot)) {
 46                 vunmap((void *)addr);
 47                 return NULL;
 48         }
 49 
 50         return (void __iomem *) (offset + addr);
 51 }
 52 
 53 void __iounmap(const volatile void __iomem *addr)
 54 {
 55         vunmap((void *) ((unsigned long) addr & PAGE_MASK));
 56 }
 57 

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