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e2c600a1f3
Revert "sched_clock: Avoid corrupting hrtimer tree during suspend" This reverts commit8aad725c70. Revert "sched_clock: Add support for >32 bit sched_clock" This reverts commit657eb100e4. Revert "sched_clock: Use an hrtimer instead of timer" This reverts commitb2ee62ec51. Revert "sched_clock: Use seqcount instead of rolling our own" This reverts commit538b187b6e. Revert "ARM: sched_clock: Load cycle count after epoch stabilizes" This reverts commit8c7175ba39. Revert "sched_clock: Make ARM's sched_clock generic for all architectures" This reverts commitebb97da74a. Revert "ARM: 7699/1: sched_clock: Add more notrace to prevent recursion" This reverts commit086da6a6c4. Revert "ARM: make sched_clock just call a function pointer" This reverts commit0dd4fad6c9. Revert "ARM: sched_clock: allow changing to higher frequency counter" This reverts commit4a3cf85432. Change-Id: I98aaec7b554a2e11be4c551a864d952e0d8c3e22
93 lines
2.4 KiB
C
93 lines
2.4 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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* Author: Sundar Iyer for ST-Ericsson
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* sched_clock implementation is based on:
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* plat-nomadik/timer.c Linus Walleij <linus.walleij@stericsson.com>
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*
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* DBx500-PRCMU Timer
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* The PRCMU has 5 timers which are available in a always-on
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* power domain. We use the Timer 4 for our always-on clock
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* source on DB8500 and Timer 3 on DB5500.
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*/
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#include <linux/clockchips.h>
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#include <linux/clksrc-dbx500-prcmu.h>
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#include <asm/sched_clock.h>
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#include <mach/setup.h>
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#include <mach/hardware.h>
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#define RATE_32K 32768
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#define TIMER_MODE_CONTINOUS 0x1
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#define TIMER_DOWNCOUNT_VAL 0xffffffff
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#define PRCMU_TIMER_REF 0
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#define PRCMU_TIMER_DOWNCOUNT 0x4
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#define PRCMU_TIMER_MODE 0x8
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#define SCHED_CLOCK_MIN_WRAP 131072 /* 2^32 / 32768 */
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static void __iomem *clksrc_dbx500_timer_base;
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static cycle_t clksrc_dbx500_prcmu_read(struct clocksource *cs)
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{
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u32 count, count2;
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do {
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count = readl(clksrc_dbx500_timer_base +
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PRCMU_TIMER_DOWNCOUNT);
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count2 = readl(clksrc_dbx500_timer_base +
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PRCMU_TIMER_DOWNCOUNT);
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} while (count2 != count);
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/* Negate because the timer is a decrementing counter */
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return ~count;
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}
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static struct clocksource clocksource_dbx500_prcmu = {
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.name = "dbx500-prcmu-timer",
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.rating = 300,
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.read = clksrc_dbx500_prcmu_read,
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.mask = CLOCKSOURCE_MASK(32),
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.flags = CLOCK_SOURCE_IS_CONTINUOUS,
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};
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#ifdef CONFIG_CLKSRC_DBX500_PRCMU_SCHED_CLOCK
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static u32 notrace dbx500_prcmu_sched_clock_read(void)
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{
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if (unlikely(!clksrc_dbx500_timer_base))
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return 0;
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return clksrc_dbx500_prcmu_read(&clocksource_dbx500_prcmu);
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}
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#endif
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void __init clksrc_dbx500_prcmu_init(void __iomem *base)
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{
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clksrc_dbx500_timer_base = base;
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/*
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* The A9 sub system expects the timer to be configured as
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* a continous looping timer.
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* The PRCMU should configure it but if it for some reason
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* don't we do it here.
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*/
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if (readl(clksrc_dbx500_timer_base + PRCMU_TIMER_MODE) !=
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TIMER_MODE_CONTINOUS) {
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writel(TIMER_MODE_CONTINOUS,
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clksrc_dbx500_timer_base + PRCMU_TIMER_MODE);
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writel(TIMER_DOWNCOUNT_VAL,
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clksrc_dbx500_timer_base + PRCMU_TIMER_REF);
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}
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#ifdef CONFIG_CLKSRC_DBX500_PRCMU_SCHED_CLOCK
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setup_sched_clock(dbx500_prcmu_sched_clock_read,
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32, RATE_32K);
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#endif
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clocksource_register_hz(&clocksource_dbx500_prcmu, RATE_32K);
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}
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