diff options
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/cpu/armv7/highbank/Makefile | 46 | ||||
| -rw-r--r-- | arch/arm/cpu/armv7/highbank/timer.c | 123 |
2 files changed, 169 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/highbank/Makefile b/arch/arm/cpu/armv7/highbank/Makefile new file mode 100644 index 0000000..76faeb0 --- /dev/null +++ b/arch/arm/cpu/armv7/highbank/Makefile @@ -0,0 +1,46 @@ +# +# (C) Copyright 2000-2006 +# Wolfgang Denk, DENX Software Engineering, wd@denx.de. +# +# 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 $(TOPDIR)/config.mk + +LIB = $(obj)lib$(SOC).o + +COBJS := timer.o +SOBJS := + +SRCS := $(SOBJS:.o=.S) $(COBJS:.o=.c) +OBJS := $(addprefix $(obj),$(COBJS) $(SOBJS)) + +all: $(obj).depend $(LIB) + +$(LIB): $(OBJS) + $(call cmd_link_o_target, $(OBJS)) + +######################################################################### + +# defines $(obj).depend target +include $(SRCTREE)/rules.mk + +sinclude $(obj).depend + +######################################################################### diff --git a/arch/arm/cpu/armv7/highbank/timer.c b/arch/arm/cpu/armv7/highbank/timer.c new file mode 100644 index 0000000..d8a0288 --- /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 <http://www.gnu.org/licenses/>. + */ + +#include <common.h> +#include <div64.h> +#include <linux/types.h> /* for size_t */ +#include <linux/stddef.h> /* for NULL */ +#include <asm/io.h> +#include <asm/arch-armv7/systimer.h> + +#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()); +} |