1/* $Id: devmap.c,v 1.1.1.1 2007/08/03 18:52:18 Exp $ 2 * promdevmap.c: Map device/IO areas to virtual addresses. 3 * 4 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) 5 */ 6 7#include <linux/types.h> 8#include <linux/kernel.h> 9#include <linux/sched.h> 10 11#include <asm/openprom.h> 12#include <asm/oplib.h> 13 14extern void restore_current(void); 15 16/* Just like the routines in palloc.c, these should not be used 17 * by the kernel at all. Bootloader facility mainly. And again, 18 * this is only available on V2 proms and above. 19 */ 20 21/* Map physical device address 'paddr' in IO space 'ios' of size 22 * 'num_bytes' to a virtual address, with 'vhint' being a hint to 23 * the prom as to where you would prefer the mapping. We return 24 * where the prom actually mapped it. 25 */ 26char * 27prom_mapio(char *vhint, int ios, unsigned int paddr, unsigned int num_bytes) 28{ 29 unsigned long flags; 30 char *ret; 31 32 spin_lock_irqsave(&prom_lock, flags); 33 if((num_bytes == 0) || (paddr == 0)) ret = (char *) 0x0; 34 else 35 ret = (*(romvec->pv_v2devops.v2_dumb_mmap))(vhint, ios, paddr, 36 num_bytes); 37 restore_current(); 38 spin_unlock_irqrestore(&prom_lock, flags); 39 return ret; 40} 41 42/* Unmap an IO/device area that was mapped using the above routine. */ 43void 44prom_unmapio(char *vaddr, unsigned int num_bytes) 45{ 46 unsigned long flags; 47 48 if(num_bytes == 0x0) return; 49 spin_lock_irqsave(&prom_lock, flags); 50 (*(romvec->pv_v2devops.v2_dumb_munmap))(vaddr, num_bytes); 51 restore_current(); 52 spin_unlock_irqrestore(&prom_lock, flags); 53 return; 54} 55