upstream/opnsense-src
1
0
Fork 0
mirror of https://github.com/opnsense/src.git synced 2026-06-10 17:22:46 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

Add support for the Elan CPU hardware watchdog used in "active" mode.

Browse source
This commit is contained in:
Poul-Henning Kamp 2003-02-27 21:13:08 +00:00
parent e85eab7751
commit 32f034faca
1 changed files with 65 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

65
sys/i386/i386/elan-mmcr.c
View file

@ -41,6 +41,7 @@
#include <sys/malloc.h>
#include <sys/sysctl.h>
#include <sys/timepps.h>
#include <sys/watchdog.h>
#include <machine/md_var.h>
@ -320,6 +321,67 @@ elan_mmap(dev_t dev, vm_offset_t offset, vm_offset_t *paddr, int nprot)
return (0);
}
static int
elan_watchdog(u_int spec)
{
u_int u, v;
static u_int cur;
if (spec & ~__WD_LEGAL)
return (EINVAL);
switch (spec & (WD_ACTIVE|WD_PASSIVE)) {
case WD_ACTIVE:
u = spec & WD_INTERVAL;
if (u > 35)
return (EINVAL);
u = imax(u - 5, 24);
v = 2 << (u - 24);
v |= 0xc000;
/*
* There is a bug in some silicon which prevents us from
* writing to the WDTMRCTL register if the GP echo mode is
* enabled. GP echo mode on the other hand is desirable
* for other reasons. Save and restore the GP echo mode
* around our hardware tom-foolery.
*/
u = elan_mmcr[0xc00 / 2];
elan_mmcr[0xc00 / 2] = 0;
if (v != cur) {
/* Clear the ENB bit */
elan_mmcr[0xcb0 / 2] = 0x3333;
elan_mmcr[0xcb0 / 2] = 0xcccc;
elan_mmcr[0xcb0 / 2] = 0;
/* Set new value */
elan_mmcr[0xcb0 / 2] = 0x3333;
elan_mmcr[0xcb0 / 2] = 0xcccc;
elan_mmcr[0xcb0 / 2] = v;
cur = v;
} else {
/* Just reset timer */
elan_mmcr[0xcb0 / 2] = 0xaaaa;
elan_mmcr[0xcb0 / 2] = 0x5555;
}
elan_mmcr[0xc00 / 2] = u;
return (0);
case WD_PASSIVE:
return (EOPNOTSUPP);
case 0:
u = elan_mmcr[0xc00 / 2];
elan_mmcr[0xc00 / 2] = 0;
elan_mmcr[0xcb0 / 2] = 0x3333;
elan_mmcr[0xcb0 / 2] = 0xcccc;
elan_mmcr[0xcb0 / 2] = 0x4080;
elan_mmcr[0xc00 / 2] = u;
cur = 0;
return (0);
default:
return (EINVAL);
}
}
static int
elan_ioctl(dev_t dev, u_long cmd, caddr_t arg, int flag, struct thread *tdr)
{
@ -340,6 +402,9 @@ elan_ioctl(dev_t dev, u_long cmd, caddr_t arg, int flag, struct thread *tdr)
return (error);
#endif /* ELAN_PPS */
if (cmd == WDIOCPATPAT)
return elan_watchdog(*((u_int*)arg));
/* Other future ioctl handling here */
return(error);
}