/* * I/O remap functions for Hexagon * * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 and * only version 2 as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA * 02110-1301, USA. */ #include <linux/io.h> #include <linux/vmalloc.h> #include <linux/mm.h> void __iomem *ioremap_nocache(unsigned long phys_addr, unsigned long size) { unsigned long last_addr, addr; unsigned long offset = phys_addr & ~PAGE_MASK; struct vm_struct *area; pgprot_t prot = __pgprot(_PAGE_PRESENT|_PAGE_READ|_PAGE_WRITE |(__HEXAGON_C_DEV << 6)); last_addr = phys_addr + size - 1; /* Wrapping not allowed */ if (!size || (last_addr < phys_addr)) return NULL; /* Rounds up to next page size, including whole-page offset */ size = PAGE_ALIGN(offset + size); area = get_vm_area(size, VM_IOREMAP); addr = (unsigned long)area->addr; if (ioremap_page_range(addr, addr+size, phys_addr, prot)) { vunmap((void *)addr); return NULL; } return (void __iomem *) (offset + addr); } void __iounmap(const volatile void __iomem *addr) { vunmap((void *) ((unsigned long) addr & PAGE_MASK)); }