acpipmtimer.c revision 1.1.16.5
1 1.1.16.5 yamt /* $NetBSD: acpipmtimer.c,v 1.1.16.5 2008/01/21 09:42:52 yamt Exp $ */ 2 1.1.16.3 yamt 3 1.1.16.3 yamt #include <sys/cdefs.h> 4 1.1.16.5 yamt __KERNEL_RCSID(0, "$NetBSD: acpipmtimer.c,v 1.1.16.5 2008/01/21 09:42:52 yamt Exp $"); 5 1.1.16.2 yamt 6 1.1.16.2 yamt #include <sys/types.h> 7 1.1.16.2 yamt 8 1.1.16.2 yamt #include <sys/systm.h> 9 1.1.16.2 yamt #include <sys/device.h> 10 1.1.16.2 yamt #include <sys/malloc.h> 11 1.1.16.4 yamt #include <sys/bus.h> 12 1.1.16.2 yamt #include <sys/time.h> 13 1.1.16.2 yamt #include <sys/timetc.h> 14 1.1.16.2 yamt 15 1.1.16.2 yamt #include <dev/ic/acpipmtimer.h> 16 1.1.16.2 yamt 17 1.1.16.2 yamt #define ACPI_PM_TIMER_FREQUENCY 3579545 18 1.1.16.2 yamt 19 1.1.16.2 yamt struct hwtc { 20 1.1.16.2 yamt struct timecounter tc; 21 1.1.16.2 yamt bus_space_tag_t t; 22 1.1.16.2 yamt bus_space_handle_t h; 23 1.1.16.2 yamt bus_size_t off; 24 1.1.16.2 yamt }; 25 1.1.16.2 yamt 26 1.1.16.2 yamt static u_int acpihwtimer_read_safe(struct timecounter *); 27 1.1.16.2 yamt static u_int acpihwtimer_read_fast(struct timecounter *); 28 1.1.16.2 yamt 29 1.1.16.2 yamt int 30 1.1.16.2 yamt acpipmtimer_attach(struct device *dev, 31 1.1.16.2 yamt bus_space_tag_t t, bus_space_handle_t h, bus_size_t off, 32 1.1.16.2 yamt int flags) 33 1.1.16.2 yamt { 34 1.1.16.2 yamt struct hwtc *tc; 35 1.1.16.2 yamt 36 1.1.16.2 yamt tc = malloc(sizeof(struct hwtc), M_DEVBUF, M_WAITOK|M_ZERO); 37 1.1.16.2 yamt if (!tc) 38 1.1.16.2 yamt return (-1); 39 1.1.16.2 yamt 40 1.1.16.2 yamt tc->tc.tc_name = dev->dv_xname; 41 1.1.16.2 yamt tc->tc.tc_frequency = ACPI_PM_TIMER_FREQUENCY; 42 1.1.16.2 yamt if (flags & ACPIPMT_32BIT) 43 1.1.16.2 yamt tc->tc.tc_counter_mask = 0xffffffff; 44 1.1.16.2 yamt else 45 1.1.16.2 yamt tc->tc.tc_counter_mask = 0x00ffffff; 46 1.1.16.2 yamt if (flags & ACPIPMT_BADLATCH) { 47 1.1.16.2 yamt tc->tc.tc_get_timecount = acpihwtimer_read_safe; 48 1.1.16.2 yamt tc->tc.tc_quality = 900; 49 1.1.16.2 yamt } else { 50 1.1.16.2 yamt tc->tc.tc_get_timecount = acpihwtimer_read_fast; 51 1.1.16.2 yamt tc->tc.tc_quality = 1000; 52 1.1.16.2 yamt } 53 1.1.16.2 yamt 54 1.1.16.2 yamt tc->t = t; 55 1.1.16.2 yamt tc->h = h; 56 1.1.16.2 yamt tc->off = off; 57 1.1.16.2 yamt 58 1.1.16.2 yamt tc->tc.tc_priv = tc; 59 1.1.16.2 yamt tc_init(&tc->tc); 60 1.1.16.3 yamt aprint_normal("%s: %d-bit timer\n", tc->tc.tc_name, 61 1.1.16.2 yamt (flags & ACPIPMT_32BIT ? 32 : 24)); 62 1.1.16.2 yamt return (0); 63 1.1.16.2 yamt } 64 1.1.16.2 yamt 65 1.1.16.2 yamt #define r(h) bus_space_read_4(h->t, h->h, h->off) 66 1.1.16.2 yamt 67 1.1.16.2 yamt static u_int 68 1.1.16.2 yamt acpihwtimer_read_safe(struct timecounter *tc) 69 1.1.16.2 yamt { 70 1.1.16.2 yamt struct hwtc *h = tc->tc_priv; 71 1.1.16.2 yamt uint32_t t1, t2, t3; 72 1.1.16.2 yamt 73 1.1.16.2 yamt t2 = r(h); 74 1.1.16.2 yamt t3 = r(h); 75 1.1.16.2 yamt do { 76 1.1.16.2 yamt t1 = t2; 77 1.1.16.2 yamt t2 = t3; 78 1.1.16.2 yamt t3 = r(h); 79 1.1.16.2 yamt } while ((t1 > t2) || (t2 > t3)); 80 1.1.16.2 yamt return (t2); 81 1.1.16.2 yamt } 82 1.1.16.2 yamt 83 1.1.16.2 yamt static u_int 84 1.1.16.2 yamt acpihwtimer_read_fast(struct timecounter *tc) 85 1.1.16.2 yamt { 86 1.1.16.2 yamt struct hwtc *h = tc->tc_priv; 87 1.1.16.2 yamt 88 1.1.16.2 yamt return r(h); 89 1.1.16.2 yamt } 90
Indexes created Tue Sep 30 20:09:53 GMT 2025