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author | Masahiro Yamada <yamada.m@jp.panasonic.com> | 2015-02-20 11:04:03 +0300 |
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committer | Tom Rini <trini@ti.com> | 2015-02-21 16:23:51 +0300 |
commit | 620118403e1521b4c883848a84d2fb68e3fa1aa0 (patch) | |
tree | 880f15ded4ea034088c4155d56a4846e8edc54f0 /arch/arm/mach-at91/arm920t/timer.c | |
parent | 01f14456306c84f9bcd3945a10c98ae50e30542a (diff) | |
download | u-boot-620118403e1521b4c883848a84d2fb68e3fa1aa0.tar.xz |
ARM: at91: collect SoC sources into mach-at91
This commit moves source files as follows:
arch/arm/cpu/arm920t/at91/* -> arch/arm/mach-at91/arm920t/*
arch/arm/cpu/arm926ejs/at91/* -> arch/arm/mach-at91/arm926ejs/*
arch/arm/cpu/armv7/at91/* -> arch/arm/mach-at91/armv7/*
arch/arm/cpu/at91-common/* -> arch/arm/mach-at91/*
Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Acked-by: Andreas Bießmann <andreas.devel@googlemail.co>
Diffstat (limited to 'arch/arm/mach-at91/arm920t/timer.c')
-rw-r--r-- | arch/arm/mach-at91/arm920t/timer.c | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/arch/arm/mach-at91/arm920t/timer.c b/arch/arm/mach-at91/arm920t/timer.c new file mode 100644 index 0000000000..6aa2994723 --- /dev/null +++ b/arch/arm/mach-at91/arm920t/timer.c @@ -0,0 +1,127 @@ +/* + * (C) Copyright 2002 + * Lineo, Inc. <www.lineo.com> + * Bernhard Kuhn <bkuhn@lineo.com> + * + * (C) Copyright 2002 + * Sysgo Real-Time Solutions, GmbH <www.elinos.com> + * Marius Groeger <mgroeger@sysgo.de> + * + * (C) Copyright 2002 + * Sysgo Real-Time Solutions, GmbH <www.elinos.com> + * Alex Zuepke <azu@sysgo.de> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> + +#include <asm/io.h> +#include <asm/arch/hardware.h> +#include <asm/arch/at91_tc.h> +#include <asm/arch/at91_pmc.h> + +DECLARE_GLOBAL_DATA_PTR; + +/* the number of clocks per CONFIG_SYS_HZ */ +#define TIMER_LOAD_VAL (CONFIG_SYS_HZ_CLOCK/CONFIG_SYS_HZ) + +int timer_init(void) +{ + at91_tc_t *tc = (at91_tc_t *) ATMEL_BASE_TC; + at91_pmc_t *pmc = (at91_pmc_t *) ATMEL_BASE_PMC; + + /* enables TC1.0 clock */ + writel(1 << ATMEL_ID_TC0, &pmc->pcer); /* enable clock */ + + writel(0, &tc->bcr); + writel(AT91_TC_BMR_TC0XC0S_NONE | AT91_TC_BMR_TC1XC1S_NONE | + AT91_TC_BMR_TC2XC2S_NONE , &tc->bmr); + + writel(AT91_TC_CCR_CLKDIS, &tc->tc[0].ccr); + /* set to MCLK/2 and restart the timer + when the value in TC_RC is reached */ + writel(AT91_TC_CMR_TCCLKS_CLOCK1 | AT91_TC_CMR_CPCTRG, &tc->tc[0].cmr); + + writel(0xFFFFFFFF, &tc->tc[0].idr); /* disable interrupts */ + writel(TIMER_LOAD_VAL, &tc->tc[0].rc); + + writel(AT91_TC_CCR_SWTRG | AT91_TC_CCR_CLKEN, &tc->tc[0].ccr); + gd->arch.lastinc = 0; + gd->arch.tbl = 0; + + return 0; +} + +/* + * timer without interrupts + */ +ulong get_timer(ulong base) +{ + return get_timer_masked() - base; +} + +void __udelay(unsigned long usec) +{ + udelay_masked(usec); +} + +ulong get_timer_raw(void) +{ + at91_tc_t *tc = (at91_tc_t *) ATMEL_BASE_TC; + u32 now; + + now = readl(&tc->tc[0].cv) & 0x0000ffff; + + if (now >= gd->arch.lastinc) { + /* normal mode */ + gd->arch.tbl += now - gd->arch.lastinc; + } else { + /* we have an overflow ... */ + gd->arch.tbl += now + TIMER_LOAD_VAL - gd->arch.lastinc; + } + gd->arch.lastinc = now; + + return gd->arch.tbl; +} + +ulong get_timer_masked(void) +{ + return get_timer_raw()/TIMER_LOAD_VAL; +} + +void udelay_masked(unsigned long usec) +{ + u32 tmo; + u32 endtime; + signed long diff; + + tmo = CONFIG_SYS_HZ_CLOCK / 1000; + tmo *= usec; + tmo /= 1000; + + endtime = get_timer_raw() + tmo; + + do { + u32 now = get_timer_raw(); + diff = endtime - now; + } while (diff >= 0); +} + +/* + * This function is derived from PowerPC code (read timebase as long long). + * On ARM it just returns the timer value. + */ +unsigned long long get_ticks(void) +{ + return get_timer(0); +} + +/* + * This function is derived from PowerPC code (timebase clock frequency). + * On ARM it returns the number of timer ticks per second. + */ +ulong get_tbclk(void) +{ + return CONFIG_SYS_HZ; +} |