2 * Copyright (C) ST-Ericsson SA 2011
4 * License Terms: GNU General Public License v2
5 * Author: Mattias Wallin <mattias.wallin@stericsson.com> for ST-Ericsson
8 #include <linux/clksrc-dbx500-prcmu.h>
10 #include <asm/localtimer.h>
14 #include <mach/setup.h>
15 #include <mach/hardware.h>
17 static void __init ux500_timer_init(void)
20 #ifdef CONFIG_LOCAL_TIMERS
21 twd_base = __io_address(U5500_TWD_BASE);
23 mtu_base = __io_address(U5500_MTU0_BASE);
24 clksrc_dbx500_timer_base = __io_address(U5500_PRCMU_TIMER_3_BASE);
25 } else if (cpu_is_u8500()) {
26 #ifdef CONFIG_LOCAL_TIMERS
27 twd_base = __io_address(U8500_TWD_BASE);
29 mtu_base = __io_address(U8500_MTU0_BASE);
30 clksrc_dbx500_timer_base = __io_address(U8500_PRCMU_TIMER_4_BASE);
36 * Here we register the timerblocks active in the system.
37 * Localtimers (twd) is started when both cpu is up and running.
38 * MTU register a clocksource, clockevent and sched_clock.
39 * Since the MTU is located in the VAPE power domain
40 * it will be cleared in sleep which makes it unsuitable.
41 * We however need it as a timer tick (clockevent)
42 * during boot to calibrate delay until twd is started.
43 * RTC-RTT have problems as timer tick during boot since it is
44 * depending on delay which is not yet calibrated. RTC-RTT is in the
45 * always-on powerdomain and is used as clockevent instead of twd when
47 * The PRCMU timer 4(3 for DB5500) register a clocksource and
48 * sched_clock with higher rating then MTU since is always-on.
53 clksrc_dbx500_prcmu_init();
56 static void ux500_timer_reset(void)
62 struct sys_timer ux500_timer = {
63 .init = ux500_timer_init,
64 .resume = ux500_timer_reset,