2 * (C) Copyright 2008,2009
3 * Graeme Russ, <graeme.russ@gmail.com>
6 * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
8 * See file CREDITS for list of people who contributed to this
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License as
13 * published by the Free Software Foundation; either version 2 of
14 * the License, or (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
30 #include <asm/i8254.h>
31 #include <asm/ibmpc.h>
33 DECLARE_GLOBAL_DATA_PTR;
35 struct timer_isr_function {
36 struct timer_isr_function *next;
37 timer_fnc_t *isr_func;
40 static struct timer_isr_function *first_timer_isr;
41 static unsigned long system_ticks;
44 * register_timer_isr() allows multiple architecture and board specific
45 * functions to be called every millisecond. Keep the execution time of
46 * each function as low as possible
48 int register_timer_isr(timer_fnc_t *isr_func)
50 struct timer_isr_function *new_func;
51 struct timer_isr_function *temp;
54 new_func = malloc(sizeof(struct timer_isr_function));
59 new_func->isr_func = isr_func;
60 new_func->next = NULL;
63 * Don't allow timer interrupts while the
64 * linked list is being modified
66 flag = disable_interrupts();
68 if (first_timer_isr == NULL) {
69 first_timer_isr = new_func;
71 temp = first_timer_isr;
72 while (temp->next != NULL)
74 temp->next = new_func;
84 * timer_isr() MUST be the registered interrupt handler for
86 void timer_isr(void *unused)
88 struct timer_isr_function *temp = first_timer_isr;
92 /* Execute each registered function */
93 while (temp != NULL) {
99 ulong get_timer(ulong base)
101 return system_ticks - base;
104 void timer_set_tsc_base(uint64_t new_base)
106 gd->arch.tsc_base = new_base;
109 uint64_t timer_get_tsc(void)
114 if (!gd->arch.tsc_base)
115 gd->arch.tsc_base = time_now;
117 return time_now - gd->arch.tsc_base;