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author | Albert ARIBAUD <albert.u.boot@aribaud.net> | 2013-06-08 12:35:10 (GMT) |
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committer | Albert ARIBAUD <albert.u.boot@aribaud.net> | 2013-06-08 12:35:10 (GMT) |
commit | 10e167329b029890a4c704f094822da5f259b886 (patch) | |
tree | c0950b7cb928ee26b07c39348e4539602ce3aec9 /arch/arm/cpu/armv7/vf610/timer.c | |
parent | dbc000bfb51eb30d786521e6b8e29048c36cbefa (diff) | |
parent | 4a1c7b13ae104d4526d3176793b7f6b06694df15 (diff) | |
download | u-boot-10e167329b029890a4c704f094822da5f259b886.tar.xz |
Merge branch 'u-boot-imx/master' into 'u-boot-arm/master'
Conflicts:
drivers/serial/Makefile
Diffstat (limited to 'arch/arm/cpu/armv7/vf610/timer.c')
-rw-r--r-- | arch/arm/cpu/armv7/vf610/timer.c | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/vf610/timer.c b/arch/arm/cpu/armv7/vf610/timer.c new file mode 100644 index 0000000..f8fbed7 --- /dev/null +++ b/arch/arm/cpu/armv7/vf610/timer.c @@ -0,0 +1,103 @@ +/* + * Copyright 2013 Freescale Semiconductor, Inc. + * + * 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 <common.h> +#include <asm/io.h> +#include <div64.h> +#include <asm/arch/imx-regs.h> +#include <asm/arch/clock.h> + +static struct pit_reg *cur_pit = (struct pit_reg *)PIT_BASE_ADDR; + +DECLARE_GLOBAL_DATA_PTR; + +#define TIMER_LOAD_VAL 0xffffffff + +static inline unsigned long long tick_to_time(unsigned long long tick) +{ + tick *= CONFIG_SYS_HZ; + do_div(tick, mxc_get_clock(MXC_IPG_CLK)); + + return tick; +} + +static inline unsigned long long us_to_tick(unsigned long long usec) +{ + usec = usec * mxc_get_clock(MXC_IPG_CLK) + 999999; + do_div(usec, 1000000); + + return usec; +} + +int timer_init(void) +{ + __raw_writel(0, &cur_pit->mcr); + + __raw_writel(TIMER_LOAD_VAL, &cur_pit->ldval1); + __raw_writel(0, &cur_pit->tctrl1); + __raw_writel(1, &cur_pit->tctrl1); + + gd->arch.tbl = 0; + gd->arch.tbu = 0; + + return 0; +} + +unsigned long long get_ticks(void) +{ + ulong now = TIMER_LOAD_VAL - __raw_readl(&cur_pit->cval1); + + /* increment tbu if tbl has rolled over */ + if (now < gd->arch.tbl) + gd->arch.tbu++; + gd->arch.tbl = now; + + return (((unsigned long long)gd->arch.tbu) << 32) | gd->arch.tbl; +} + +ulong get_timer_masked(void) +{ + return tick_to_time(get_ticks()); +} + +ulong get_timer(ulong base) +{ + return get_timer_masked() - base; +} + +/* delay x useconds AND preserve advance timstamp value */ +void __udelay(unsigned long usec) +{ + unsigned long long start; + ulong tmo; + + start = get_ticks(); /* get current timestamp */ + tmo = us_to_tick(usec); /* convert usecs to ticks */ + while ((get_ticks() - start) < tmo) + ; /* loop till time has passed */ +} + +/* + * 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 mxc_get_clock(MXC_IPG_CLK); +} |