From 37fc0ed268dc5acacd3a83adafa26eb1a84e90af Mon Sep 17 00:00:00 2001 From: Rob Herring Date: Mon, 24 Oct 2011 08:50:20 +0000 Subject: ARM: Add Calxeda Highbank platform Add basic support for Calxeda Highbank platform. Only minimal support with serial and SATA are included. Signed-off-by: Jason Hobbs Signed-off-by: Rob Herring Cc: Albert ARIBAUD --- arch/arm/cpu/armv7/highbank/timer.c | 123 ++++++++++++++++++++++++++++++++++++ 1 file changed, 123 insertions(+) create mode 100644 arch/arm/cpu/armv7/highbank/timer.c (limited to 'arch/arm/cpu/armv7/highbank/timer.c') diff --git a/arch/arm/cpu/armv7/highbank/timer.c b/arch/arm/cpu/armv7/highbank/timer.c new file mode 100644 index 00000000000..d8a02888a2a --- /dev/null +++ b/arch/arm/cpu/armv7/highbank/timer.c @@ -0,0 +1,123 @@ +/* + * Copyright 2010-2011 Calxeda, Inc. + * + * Based on arm926ejs/mx27/timer.c + * + * 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 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, see . + */ + +#include +#include +#include /* for size_t */ +#include /* for NULL */ +#include +#include + +#undef SYSTIMER_BASE +#define SYSTIMER_BASE 0xFFF34000 /* Timer 0 and 1 base */ +#define SYSTIMER_RATE 150000000 + +static ulong timestamp; +static ulong lastinc; +static struct systimer *systimer_base = (struct systimer *)SYSTIMER_BASE; + +/* + * Start the timer + */ +int timer_init(void) +{ + /* + * Setup timer0 + */ + writel(SYSTIMER_RELOAD, &systimer_base->timer0load); + writel(SYSTIMER_RELOAD, &systimer_base->timer0value); + writel(SYSTIMER_EN | SYSTIMER_32BIT, &systimer_base->timer0control); + + reset_timer_masked(); + + return 0; + +} + +#define TICK_PER_TIME ((SYSTIMER_RATE + CONFIG_SYS_HZ / 2) / CONFIG_SYS_HZ) +#define NS_PER_TICK (1000000000 / SYSTIMER_RATE) + +static inline unsigned long long tick_to_time(unsigned long long tick) +{ + do_div(tick, TICK_PER_TIME); + return tick; +} + +static inline unsigned long long time_to_tick(unsigned long long time) +{ + return time * TICK_PER_TIME; +} + +static inline unsigned long long us_to_tick(unsigned long long us) +{ + unsigned long long tick = us << 16; + tick += NS_PER_TICK - 1; + do_div(tick, NS_PER_TICK); + return tick >> 16; +} + +unsigned long long get_ticks(void) +{ + ulong now = ~readl(&systimer_base->timer0value); + + if (now >= lastinc) /* normal mode (non roll) */ + /* move stamp forward with absolut diff ticks */ + timestamp += (now - lastinc); + else /* we have rollover of incrementer */ + timestamp += (0xFFFFFFFF - lastinc) + now; + lastinc = now; + return timestamp; +} + +/* + * Delay x useconds AND preserve advance timstamp value + * assumes timer is ticking at 1 msec + */ +void __udelay(ulong usec) +{ + unsigned long long tmp; + ulong tmo; + + tmo = us_to_tick(usec); + tmp = get_ticks() + tmo; /* get current timestamp */ + + while (get_ticks() < tmp) /* loop till event */ + /*NOP*/; +} + +ulong get_timer(ulong base) +{ + return get_timer_masked() - base; +} + +void reset_timer_masked(void) +{ + lastinc = ~readl(&systimer_base->timer0value); + timestamp = 0; +} + +void reset_timer(void) +{ + reset_timer_masked(); +} + +ulong get_timer_masked(void) +{ + return tick_to_time(get_ticks()); +} -- cgit v1.2.3