ia64/linux-2.6.18-xen.hg

view arch/sparc/prom/devops.c @ 0:831230e53067

Import 2.6.18 from kernel.org tarball.
author Ian Campbell <ian.campbell@xensource.com>
date Wed Apr 11 14:15:44 2007 +0100 (2007-04-11)
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1 /* $Id: devops.c,v 1.13 2000/08/26 02:38:03 anton Exp $
2 * devops.c: Device operations using the PROM.
3 *
4 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
5 */
6 #include <linux/types.h>
7 #include <linux/kernel.h>
8 #include <linux/sched.h>
10 #include <asm/openprom.h>
11 #include <asm/oplib.h>
13 extern void restore_current(void);
15 /* Open the device described by the string 'dstr'. Returns the handle
16 * to that device used for subsequent operations on that device.
17 * Returns -1 on failure.
18 */
19 int
20 prom_devopen(char *dstr)
21 {
22 int handle;
23 unsigned long flags;
24 spin_lock_irqsave(&prom_lock, flags);
25 switch(prom_vers) {
26 case PROM_V0:
27 handle = (*(romvec->pv_v0devops.v0_devopen))(dstr);
28 if(handle == 0) handle = -1;
29 break;
30 case PROM_V2:
31 case PROM_V3:
32 handle = (*(romvec->pv_v2devops.v2_dev_open))(dstr);
33 break;
34 default:
35 handle = -1;
36 break;
37 };
38 restore_current();
39 spin_unlock_irqrestore(&prom_lock, flags);
41 return handle;
42 }
44 /* Close the device described by device handle 'dhandle'. */
45 int
46 prom_devclose(int dhandle)
47 {
48 unsigned long flags;
49 spin_lock_irqsave(&prom_lock, flags);
50 switch(prom_vers) {
51 case PROM_V0:
52 (*(romvec->pv_v0devops.v0_devclose))(dhandle);
53 break;
54 case PROM_V2:
55 case PROM_V3:
56 (*(romvec->pv_v2devops.v2_dev_close))(dhandle);
57 break;
58 default:
59 break;
60 };
61 restore_current();
62 spin_unlock_irqrestore(&prom_lock, flags);
63 return 0;
64 }
66 /* Seek to specified location described by 'seekhi' and 'seeklo'
67 * for device 'dhandle'.
68 */
69 void
70 prom_seek(int dhandle, unsigned int seekhi, unsigned int seeklo)
71 {
72 unsigned long flags;
73 spin_lock_irqsave(&prom_lock, flags);
74 switch(prom_vers) {
75 case PROM_V0:
76 (*(romvec->pv_v0devops.v0_seekdev))(dhandle, seekhi, seeklo);
77 break;
78 case PROM_V2:
79 case PROM_V3:
80 (*(romvec->pv_v2devops.v2_dev_seek))(dhandle, seekhi, seeklo);
81 break;
82 default:
83 break;
84 };
85 restore_current();
86 spin_unlock_irqrestore(&prom_lock, flags);
88 return;
89 }