From 716ca530e1c4515d8683c9d5be3d56b301758b66 Mon Sep 17 00:00:00 2001 From: James <> Date: Wed, 4 Nov 2015 11:49:21 +0000 Subject: trunk-47381 --- .../files/arch/arm/cpu/arm1136/nas782x/timer.c | 129 +++++++++++++++++++++ 1 file changed, 129 insertions(+) create mode 100644 package/boot/uboot-oxnas/files/arch/arm/cpu/arm1136/nas782x/timer.c (limited to 'package/boot/uboot-oxnas/files/arch/arm/cpu/arm1136/nas782x/timer.c') diff --git a/package/boot/uboot-oxnas/files/arch/arm/cpu/arm1136/nas782x/timer.c b/package/boot/uboot-oxnas/files/arch/arm/cpu/arm1136/nas782x/timer.c new file mode 100644 index 0000000..5e87608 --- /dev/null +++ b/package/boot/uboot-oxnas/files/arch/arm/cpu/arm1136/nas782x/timer.c @@ -0,0 +1,129 @@ +/* + * (C) Copyright 2004 + * Texas Instruments + * Richard Woodruff + * + * (C) Copyright 2002 + * Sysgo Real-Time Solutions, GmbH + * Marius Groeger + * Alex Zuepke + * + * (C) Copyright 2002 + * Gary Jennejohn, DENX Software Engineering, + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include +#include + +#define TIMER_CLOCK (CONFIG_SYS_CLK_FREQ / (1 << (CONFIG_TIMER_PRESCALE * 4))) +#define TIMER_LOAD_VAL 0xFFFFFF + +/* macro to read the 32 bit timer */ +#define READ_TIMER (TIMER_LOAD_VAL - readl(CONFIG_SYS_TIMERBASE + TIMER_CURR)) \ + / (TIMER_CLOCK / CONFIG_SYS_HZ) + +#define READ_TIMER_HW (TIMER_LOAD_VAL - readl(CONFIG_SYS_TIMERBASE + TIMER_CURR)) + +DECLARE_GLOBAL_DATA_PTR; + +int timer_init (void) +{ + int32_t val; + + /* Start the counter ticking up */ + writel(TIMER_LOAD_VAL, CONFIG_SYS_TIMERBASE + TIMER_LOAD); /* reload value on overflow*/ + + val = (CONFIG_TIMER_PRESCALE << TIMER_PRESCALE_SHIFT) | + (TIMER_MODE_PERIODIC << TIMER_MODE_SHIFT) | + (TIMER_ENABLE << TIMER_ENABLE_SHIFT); /* mask to enable timer*/ + writel(val, CONFIG_SYS_TIMERBASE + TIMER_CTRL); /* start timer */ + + /* reset time */ + gd->arch.lastinc = READ_TIMER; /* capture current incrementer value */ + gd->arch.tbl = 0; /* start "advancing" time stamp */ + + return(0); +} +/* + * timer without interrupts + */ +ulong get_timer (ulong base) +{ + return get_timer_masked () - base; +} + +/* delay x useconds AND preserve advance timestamp value */ +void __udelay (unsigned long usec) +{ + ulong tmo, tmp; + + if (usec > 100000) { /* if "big" number, spread normalization to seconds */ + tmo = usec / 1000; /* start to normalize for usec to ticks per sec */ + tmo *= CONFIG_SYS_HZ; /* find number of "ticks" to wait to achieve target */ + tmo /= 1000; /* finish normalize. */ + + tmp = get_timer (0); /* get current timestamp */ + while (get_timer (tmp) < tmo)/* loop till event */ + /*NOP*/; + } else { /* else small number, convert to hw ticks */ + tmo = usec * (TIMER_CLOCK / 1000) / 1000; + /* timeout is no more than 0.1s, and the hw timer will roll over at most once */ + tmp = READ_TIMER_HW; + while (((READ_TIMER_HW -tmp) & TIMER_LOAD_VAL) < tmo)/* loop till event */ + /*NOP*/; + } +} + +ulong get_timer_masked (void) +{ + ulong now = READ_TIMER; /* current tick value */ + + if (now >= gd->arch.lastinc) { /* normal mode (non roll) */ + /* move stamp fordward with absoulte diff ticks */ + gd->arch.tbl += (now - gd->arch.lastinc); + } else { + /* we have rollover of incrementer */ + gd->arch.tbl += ((TIMER_LOAD_VAL / (TIMER_CLOCK / CONFIG_SYS_HZ)) + - gd->arch.lastinc) + now; + } + gd->arch.lastinc = now; + return gd->arch.tbl; +} + + +/* + * 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) +{ + ulong tbclk; + tbclk = CONFIG_SYS_HZ; + return tbclk; +} -- cgit v1.2.3