90 lines
1.8 KiB
C
90 lines
1.8 KiB
C
/* $NetBSD: acpipmtimer.c,v 1.6 2008/04/08 12:07:25 cegger Exp $ */
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: acpipmtimer.c,v 1.6 2008/04/08 12:07:25 cegger Exp $");
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#include <sys/types.h>
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#include <sys/systm.h>
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#include <sys/device.h>
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#include <sys/malloc.h>
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#include <sys/bus.h>
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#include <sys/time.h>
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#include <sys/timetc.h>
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#include <dev/ic/acpipmtimer.h>
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#define ACPI_PM_TIMER_FREQUENCY 3579545
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struct hwtc {
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struct timecounter tc;
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bus_space_tag_t t;
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bus_space_handle_t h;
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bus_size_t off;
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};
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static u_int acpihwtimer_read_safe(struct timecounter *);
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static u_int acpihwtimer_read_fast(struct timecounter *);
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int
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acpipmtimer_attach(struct device *dev,
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bus_space_tag_t t, bus_space_handle_t h, bus_size_t off,
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int flags)
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{
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struct hwtc *tc;
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tc = malloc(sizeof(struct hwtc), M_DEVBUF, M_WAITOK|M_ZERO);
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if (!tc)
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return (-1);
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tc->tc.tc_name = device_xname(dev);
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tc->tc.tc_frequency = ACPI_PM_TIMER_FREQUENCY;
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if (flags & ACPIPMT_32BIT)
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tc->tc.tc_counter_mask = 0xffffffff;
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else
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tc->tc.tc_counter_mask = 0x00ffffff;
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if (flags & ACPIPMT_BADLATCH) {
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tc->tc.tc_get_timecount = acpihwtimer_read_safe;
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tc->tc.tc_quality = 900;
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} else {
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tc->tc.tc_get_timecount = acpihwtimer_read_fast;
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tc->tc.tc_quality = 1000;
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}
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tc->t = t;
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tc->h = h;
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tc->off = off;
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tc->tc.tc_priv = tc;
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tc_init(&tc->tc);
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aprint_normal("%s: %d-bit timer\n", tc->tc.tc_name,
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(flags & ACPIPMT_32BIT ? 32 : 24));
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return (0);
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}
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#define r(h) bus_space_read_4(h->t, h->h, h->off)
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static u_int
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acpihwtimer_read_safe(struct timecounter *tc)
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{
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struct hwtc *h = tc->tc_priv;
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uint32_t t1, t2, t3;
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t2 = r(h);
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t3 = r(h);
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do {
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t1 = t2;
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t2 = t3;
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t3 = r(h);
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} while ((t1 > t2) || (t2 > t3));
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return (t2);
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}
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static u_int
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acpihwtimer_read_fast(struct timecounter *tc)
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{
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struct hwtc *h = tc->tc_priv;
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return r(h);
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}
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