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add some common code to support the ACPI power management timer

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independly of ACPI
This commit is contained in:
drochner 2006-06-26 16:13:21 +00:00
parent c89713e730
commit eff818776d
3 changed files with 102 additions and 1 deletions
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7
sys/conf/files
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@ -1,4 +1,4 @@
# $NetBSD: files,v 1.783 2006/06/25 08:00:01 yamt Exp $
# $NetBSD: files,v 1.784 2006/06/26 16:13:21 drochner Exp $
# @(#)files.newconf 7.5 (Berkeley) 5/10/93
@ -913,6 +913,11 @@ file dev/ic/tea5757.c tea5757
define lm700x
file dev/ic/lm700x.c lm700x
# ACPI power management timer (hardware access, independent of ACPI)
#
define acpipmtimer
file dev/ic/acpipmtimer.c acpipmtimer
# Definitions for wscons
# device attributes: display, display with emulator, keyboard, and mouse
#

90
sys/dev/ic/acpipmtimer.c Normal file
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@ -0,0 +1,90 @@
/* $NetBSD: acpipmtimer.c,v 1.1 2006/06/26 16:13:21 drochner Exp $ */
#include <sys/types.h>
#ifdef __HAVE_TIMECOUNTER
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <machine/bus.h>
#include <sys/time.h>
#include <sys/timetc.h>
#include <dev/ic/acpipmtimer.h>
#define ACPI_PM_TIMER_FREQUENCY 3579545
struct hwtc {
struct timecounter tc;
bus_space_tag_t t;
bus_space_handle_t h;
bus_size_t off;
};
static u_int acpihwtimer_read_safe(struct timecounter *);
static u_int acpihwtimer_read_fast(struct timecounter *);
int
acpipmtimer_attach(struct device *dev,
bus_space_tag_t t, bus_space_handle_t h, bus_size_t off,
int flags)
{
struct hwtc *tc;
tc = malloc(sizeof(struct hwtc), M_DEVBUF, M_WAITOK|M_ZERO);
if (!tc)
return (-1);
tc->tc.tc_name = dev->dv_xname;
tc->tc.tc_frequency = ACPI_PM_TIMER_FREQUENCY;
if (flags & ACPIPMT_32BIT)
tc->tc.tc_counter_mask = 0xffffffff;
else
tc->tc.tc_counter_mask = 0x00ffffff;
if (flags & ACPIPMT_BADLATCH) {
tc->tc.tc_get_timecount = acpihwtimer_read_safe;
tc->tc.tc_quality = 900;
} else {
tc->tc.tc_get_timecount = acpihwtimer_read_fast;
tc->tc.tc_quality = 1000;
}
tc->t = t;
tc->h = h;
tc->off = off;
tc->tc.tc_priv = tc;
tc_init(&tc->tc);
aprint_normal("%s %d-bit timer\n", tc->tc.tc_name,
(flags & ACPIPMT_32BIT ? 32 : 24));
return (0);
}
#define r(h) bus_space_read_4(h->t, h->h, h->off)
static u_int
acpihwtimer_read_safe(struct timecounter *tc)
{
struct hwtc *h = tc->tc_priv;
uint32_t t1, t2, t3;
t2 = r(h);
t3 = r(h);
do {
t1 = t2;
t2 = t3;
t3 = r(h);
} while ((t1 > t2) || (t2 > t3));
return (t2);
}
static u_int
acpihwtimer_read_fast(struct timecounter *tc)
{
struct hwtc *h = tc->tc_priv;
return r(h);
}
#endif

6
sys/dev/ic/acpipmtimer.h Normal file
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@ -0,0 +1,6 @@
/* $NetBSD: acpipmtimer.h,v 1.1 2006/06/26 16:13:21 drochner Exp $ */
int acpipmtimer_attach(struct device *,
bus_space_tag_t, bus_space_handle_t, bus_size_t, int);
#define ACPIPMT_32BIT 1
#define ACPIPMT_BADLATCH 2