| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
| 9 | |
| 10 | #include <asm/openprom.h> |
| 11 | #include <asm/oplib.h> |
| 12 | |
| 13 | extern void restore_current(void); |
| 14 | |
| 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); |
| 40 | |
| 41 | return handle; |
| 42 | } |
| 43 | |
| 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 | } |
| 65 | |
| 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); |
| 87 | |
| 88 | return; |
| 89 | } |