90 lines
1.9 KiB
C
90 lines
1.9 KiB
C
|
/* $Id: devops.c,v 1.13 2000/08/26 02:38:03 anton Exp $
|
||
|
|
* devops.c: Device operations using the PROM.
|
||
|
|
*
|
||
|
|
* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
|
||
|
|
*/
|
||
|
|
#include <linux/types.h>
|
||
|
|
#include <linux/kernel.h>
|
||
|
|
#include <linux/sched.h>
|
||
|
|
|
||
|
|
#include <asm/openprom.h>
|
||
|
|
#include <asm/oplib.h>
|
||
|
|
|
||
|
|
extern void restore_current(void);
|
||
|
|
|
||
|
|
/* Open the device described by the string 'dstr'. Returns the handle
|
||
|
|
* to that device used for subsequent operations on that device.
|
||
|
|
* Returns -1 on failure.
|
||
|
|
*/
|
||
|
|
int
|
||
|
|
prom_devopen(char *dstr)
|
||
|
|
{
|
||
|
|
int handle;
|
||
|
|
unsigned long flags;
|
||
|
|
spin_lock_irqsave(&prom_lock, flags);
|
||
|
|
switch(prom_vers) {
|
||
|
|
case PROM_V0:
|
||
|
|
handle = (*(romvec->pv_v0devops.v0_devopen))(dstr);
|
||
|
|
if(handle == 0) handle = -1;
|
||
|
|
break;
|
||
|
|
case PROM_V2:
|
||
|
|
case PROM_V3:
|
||
|
|
handle = (*(romvec->pv_v2devops.v2_dev_open))(dstr);
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
handle = -1;
|
||
|
|
break;
|
||
|
|
};
|
||
|
|
restore_current();
|
||
|
|
spin_unlock_irqrestore(&prom_lock, flags);
|
||
|
|
|
||
|
|
return handle;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Close the device described by device handle 'dhandle'. */
|
||
|
|
int
|
||
|
|
prom_devclose(int dhandle)
|
||
|
|
{
|
||
|
|
unsigned long flags;
|
||
|
|
spin_lock_irqsave(&prom_lock, flags);
|
||
|
|
switch(prom_vers) {
|
||
|
|
case PROM_V0:
|
||
|
|
(*(romvec->pv_v0devops.v0_devclose))(dhandle);
|
||
|
|
break;
|
||
|
|
case PROM_V2:
|
||
|
|
case PROM_V3:
|
||
|
|
(*(romvec->pv_v2devops.v2_dev_close))(dhandle);
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
break;
|
||
|
|
};
|
||
|
|
restore_current();
|
||
|
|
spin_unlock_irqrestore(&prom_lock, flags);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Seek to specified location described by 'seekhi' and 'seeklo'
|
||
|
|
* for device 'dhandle'.
|
||
|
|
*/
|
||
|
|
void
|
||
|
|
prom_seek(int dhandle, unsigned int seekhi, unsigned int seeklo)
|
||
|
|
{
|
||
|
|
unsigned long flags;
|
||
|
|
spin_lock_irqsave(&prom_lock, flags);
|
||
|
|
switch(prom_vers) {
|
||
|
|
case PROM_V0:
|
||
|
|
(*(romvec->pv_v0devops.v0_seekdev))(dhandle, seekhi, seeklo);
|
||
|
|
break;
|
||
|
|
case PROM_V2:
|
||
|
|
case PROM_V3:
|
||
|
|
(*(romvec->pv_v2devops.v2_dev_seek))(dhandle, seekhi, seeklo);
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
break;
|
||
|
|
};
|
||
|
|
restore_current();
|
||
|
|
spin_unlock_irqrestore(&prom_lock, flags);
|
||
|
|
|
||
|
|
return;
|
||
|
|
}
|