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https://github.com/torvalds/linux
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0813069d03
In order to convert the MTU timer to work with sparse IRQ we need to pass the IRQ used when initializing instead of just letting it rely on a special name being used in the IRQ header file. Cc: Alessandro Rubini <rubini@unipv.it> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
114 lines
2.8 KiB
C
114 lines
2.8 KiB
C
/*
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* Copyright (C) ST-Ericsson SA 2011
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*
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* License Terms: GNU General Public License v2
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* Author: Mattias Wallin <mattias.wallin@stericsson.com> for ST-Ericsson
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*/
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#include <linux/io.h>
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#include <linux/errno.h>
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#include <linux/clksrc-dbx500-prcmu.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <asm/smp_twd.h>
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#include <plat/mtu.h>
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#include <mach/setup.h>
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#include <mach/hardware.h>
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#include <mach/irqs.h>
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#ifdef CONFIG_HAVE_ARM_TWD
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static DEFINE_TWD_LOCAL_TIMER(u8500_twd_local_timer,
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U8500_TWD_BASE, IRQ_LOCALTIMER);
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static void __init ux500_twd_init(void)
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{
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struct twd_local_timer *twd_local_timer;
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int err;
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/* Use this to switch local timer base if changed in new ASICs */
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twd_local_timer = &u8500_twd_local_timer;
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if (of_have_populated_dt())
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twd_local_timer_of_register();
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else {
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err = twd_local_timer_register(twd_local_timer);
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if (err)
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pr_err("twd_local_timer_register failed %d\n", err);
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}
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}
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#else
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#define ux500_twd_init() do { } while(0)
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#endif
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const static struct of_device_id prcmu_timer_of_match[] __initconst = {
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{ .compatible = "stericsson,db8500-prcmu-timer-4", },
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{ },
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};
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static void __init ux500_timer_init(void)
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{
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void __iomem *mtu_timer_base;
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void __iomem *prcmu_timer_base;
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void __iomem *tmp_base;
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struct device_node *np;
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if (cpu_is_u8500_family() || cpu_is_ux540_family()) {
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mtu_timer_base = __io_address(U8500_MTU0_BASE);
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prcmu_timer_base = __io_address(U8500_PRCMU_TIMER_4_BASE);
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} else {
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ux500_unknown_soc();
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}
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/* TODO: Once MTU has been DT:ed place code above into else. */
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if (of_have_populated_dt()) {
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#ifdef CONFIG_OF
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np = of_find_matching_node(NULL, prcmu_timer_of_match);
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if (!np)
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#endif
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goto dt_fail;
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tmp_base = of_iomap(np, 0);
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if (!tmp_base)
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goto dt_fail;
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prcmu_timer_base = tmp_base;
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}
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dt_fail:
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/* Doing it the old fashioned way. */
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/*
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* Here we register the timerblocks active in the system.
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* Localtimers (twd) is started when both cpu is up and running.
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* MTU register a clocksource, clockevent and sched_clock.
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* Since the MTU is located in the VAPE power domain
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* it will be cleared in sleep which makes it unsuitable.
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* We however need it as a timer tick (clockevent)
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* during boot to calibrate delay until twd is started.
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* RTC-RTT have problems as timer tick during boot since it is
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* depending on delay which is not yet calibrated. RTC-RTT is in the
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* always-on powerdomain and is used as clockevent instead of twd when
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* sleeping.
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* The PRCMU timer 4 register a clocksource and
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* sched_clock with higher rating then MTU since is always-on.
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*
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*/
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nmdk_timer_init(mtu_timer_base, IRQ_MTU0);
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clksrc_dbx500_prcmu_init(prcmu_timer_base);
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ux500_twd_init();
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}
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static void ux500_timer_reset(void)
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{
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nmdk_clkevt_reset();
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nmdk_clksrc_reset();
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}
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struct sys_timer ux500_timer = {
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.init = ux500_timer_init,
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.resume = ux500_timer_reset,
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};
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