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 24void __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 53void __iounmap(const volatile void __iomem *addr) 54{ 55 vunmap((void *) ((unsigned long) addr & PAGE_MASK)); 56} 57