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Add support for the watchdog in Geode SC1100 which is used in embedded

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systems like the Soekris NET4801
This commit is contained in:
Poul-Henning Kamp 2004-02-28 22:33:28 +00:00
parent 3d6e5ccb06
commit 961af6677b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=126387
1 changed files with 36 additions and 0 deletions
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36
sys/i386/i386/geode.c
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@ -32,6 +32,7 @@ __FBSDID("$FreeBSD$");
#include <sys/timetc.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/watchdog.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
@ -77,6 +78,39 @@ static struct timecounter geode_timecounter = {
1000
};
/*
* The GEODE watchdog runs from a 32kHz frequency. One period of that is
* 31250 nanoseconds which we round down to 2^14 nanoseconds. The watchdog
* consists of a power-of-two prescaler and a 16 bit counter, so the math
* is quite simple. The max timeout is 14 + 16 + 13 = 2^43 nsec ~= 2h26m.
*/
static void
geode_watchdog(void *foo __unused, u_int cmd, int *error)
{
u_int u, p, r;
u = cmd & WD_INTERVAL;
if (cmd && u >= 14 && u <= 43) {
u -= 14;
if (u > 16) {
p = u - 16;
u -= p;
} else {
p = 0;
}
if (u == 16)
u = (1 << u) - 1;
else
u = 1 << u;
r = inw(cba + 2) & 0xff00;
outw(cba + 2, p | 0xf0 | r);
outw(cba, u);
*error = 0;
} else {
outw(cba, 0);
}
}
static int
geode_probe(device_t self)
{
@ -94,6 +128,8 @@ geode_probe(device_t self)
printf("Geode rev: %02x %02x\n",
inb(cba + 0x3c), inb(cba + 0x3d));
tc_init(&geode_timecounter);
EVENTHANDLER_REGISTER(watchdog_list, geode_watchdog,
NULL, 0);
}
} else if (pci_get_devid(self) == 0x0510100b) {
gpio = pci_read_config(self, PCIR_BAR(0), 4);