summaryrefslogtreecommitdiff
path: root/src/cpu/x86/lapic/apic_timer.c
blob: 6521a8a308d9684cc771b7fc19a6ac1f5d8846ff (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2007 Advanced Micro Devices, Inc.
 * Copyright (C) 2009 coresystems GmbH
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <stdint.h>
#include <console/console.h>
#include <delay.h>
#include <thread.h>
#include <arch/cpu.h>
#include <arch/early_variables.h>
#include <cpu/intel/fsb.h>
#include <cpu/x86/msr.h>
#include <cpu/x86/lapic.h>
#include <cpu/intel/speedstep.h>

/* NOTE: This code uses global variables, so it can not be used during
 * memory init.
 */

#if CONFIG_UDELAY_LAPIC_FIXED_FSB != 0
static inline u32 get_timer_fsb(void)
{
	return CONFIG_UDELAY_LAPIC_FIXED_FSB;
}

static int set_timer_fsb(void)
{
	return 0;
}
#else
static u32 g_timer_fsb CAR_GLOBAL;

static int set_timer_fsb(void)
{
	int ia32_fsb = get_ia32_fsb();

	if (ia32_fsb > 0) {
		car_set_var(g_timer_fsb, ia32_fsb);
		return 0;
	}
	return -1;
}

static inline u32 get_timer_fsb(void)
{
	return car_get_var(g_timer_fsb);
}
#endif

void init_timer(void)
{
	/* Set the APIC timer to no interrupts and periodic mode */
	lapic_write(LAPIC_LVTT, (LAPIC_LVT_TIMER_PERIODIC | LAPIC_LVT_MASKED));

	/* Set the divider to 1, no divider */
	lapic_write(LAPIC_TDCR, LAPIC_TDR_DIV_1);

	/* Set the initial counter to 0xffffffff */
	lapic_write(LAPIC_TMICT, 0xffffffff);

	/* Set FSB frequency to a reasonable value */
	set_timer_fsb();
}

void udelay(u32 usecs)
{
	u32 start, value, ticks, timer_fsb;

	if (!thread_yield_microseconds(usecs))
		return;

	timer_fsb = get_timer_fsb();
	if (!timer_fsb || (lapic_read(LAPIC_LVTT) &
		(LAPIC_LVT_TIMER_PERIODIC | LAPIC_LVT_MASKED)) !=
		(LAPIC_LVT_TIMER_PERIODIC | LAPIC_LVT_MASKED)) {
		init_timer();
		timer_fsb = get_timer_fsb();
	}

	/* Calculate the number of ticks to run, our FSB runs at timer_fsb Mhz
	 */
	ticks = usecs * timer_fsb;
	start = lapic_read(LAPIC_TMCCT);
	do {
		value = lapic_read(LAPIC_TMCCT);
	} while ((start - value) < ticks);
}

#if CONFIG(LAPIC_MONOTONIC_TIMER)
#include <timer.h>

static struct monotonic_counter {
	int initialized;
	struct mono_time time;
	uint32_t last_value;
} mono_counter_g CAR_GLOBAL;

void timer_monotonic_get(struct mono_time *mt)
{
	uint32_t current_tick;
	uint32_t usecs_elapsed;
	uint32_t timer_fsb;
	struct monotonic_counter *mono_counter;

	mono_counter = car_get_var_ptr(&mono_counter_g);

	if (!mono_counter->initialized) {
		init_timer();
		timer_fsb = get_timer_fsb();
		/* An FSB frequency of 200Mhz provides a 20 second polling
		 * interval between timer_monotonic_get() calls before wrap
		 * around occurs. */
		if (timer_fsb > 200)
			printk(BIOS_WARNING,
			       "apic timer freq (%d) may be too fast.\n",
			       timer_fsb);
		mono_counter->last_value = lapic_read(LAPIC_TMCCT);
		mono_counter->initialized = 1;
	}

	timer_fsb = get_timer_fsb();
	current_tick = lapic_read(LAPIC_TMCCT);
	/* Note that the APIC timer counts down. */
	usecs_elapsed = (mono_counter->last_value - current_tick) / timer_fsb;

	/* Update current time and tick values only if a full tick occurred. */
	if (usecs_elapsed) {
		mono_time_add_usecs(&mono_counter->time, usecs_elapsed);
		mono_counter->last_value = current_tick;
	}

	/* Save result. */
	*mt = mono_counter->time;
}
#endif