| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* $Id: devmap.c,v 1.7 2000/08/26 02:38:03 anton 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 | |
| 14 | extern 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 | */ |
| 26 | char * |
| 27 | prom_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. */ |
| 43 | void |
| 44 | prom_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 | } |