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author | Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com> | 2012-06-13 16:29:47 +0900 |
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committer | Albert ARIBAUD <albert.u.boot@aribaud.net> | 2012-10-03 02:04:22 +0200 |
commit | 4fb44e22ec3ddc48b730865cf2c00e98224cee99 (patch) | |
tree | c2dee998eb600b18f52175117512a8ccbd2a63d0 /arch/arm/cpu/armv7/rmobile/timer.c | |
parent | a6cd85aad24cce354c5248190841dfcbc4574750 (diff) | |
download | u-boot-imx-4fb44e22ec3ddc48b730865cf2c00e98224cee99.zip u-boot-imx-4fb44e22ec3ddc48b730865cf2c00e98224cee99.tar.gz u-boot-imx-4fb44e22ec3ddc48b730865cf2c00e98224cee99.tar.bz2 |
arm: rmobile: Add basic support for Renesas R-Mobile
This patch adds minimum support for R-Mobile. Only minimal support with timer.
This CPU can uses the peripheral of Renesas SuperH.
Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
Diffstat (limited to 'arch/arm/cpu/armv7/rmobile/timer.c')
-rw-r--r-- | arch/arm/cpu/armv7/rmobile/timer.c | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/rmobile/timer.c b/arch/arm/cpu/armv7/rmobile/timer.c new file mode 100644 index 0000000..37522dc --- /dev/null +++ b/arch/arm/cpu/armv7/rmobile/timer.c @@ -0,0 +1,97 @@ +/* + * (C) Copyright 2012 Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com> + * (C) Copyright 2012 Renesas Solutions Corp. + * + * 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 <common.h> +#include <asm/io.h> +#include <asm/arch-armv7/globaltimer.h> +#include <asm/arch/rmobile.h> + +static struct globaltimer *global_timer = \ + (struct globaltimer *)GLOBAL_TIMER_BASE_ADDR; + +#define CLK2MHZ(clk) (clk / 1000 / 1000) +static u64 get_cpu_global_timer(void) +{ + u32 low, high; + u64 timer; + + u32 old = readl(&global_timer->cnt_h); + while (1) { + low = readl(&global_timer->cnt_l); + high = readl(&global_timer->cnt_h); + if (old == high) + break; + else + old = high; + } + + timer = high; + return (u64)((timer << 32) | low); +} + +static u64 get_time_us(void) +{ + u64 timer = get_cpu_global_timer(); + + timer = ((timer << 2) + (CLK2MHZ(CONFIG_SYS_CPU_CLK) >> 1)); + timer /= (u64)CLK2MHZ(CONFIG_SYS_CPU_CLK); + return timer; +} + +static ulong get_time_ms(void) +{ + return (ulong)(get_time_us() / 1000); +} + +int timer_init(void) +{ + writel(0x01, &global_timer->ctl); + return 0; +} + +void __udelay(unsigned long usec) +{ + u64 start, current; + u64 wait; + + start = get_cpu_global_timer(); + wait = (u64)((usec * CLK2MHZ(CONFIG_SYS_CPU_CLK)) >> 2); + do { + current = get_cpu_global_timer(); + } while ((current - start) < wait); +} + +ulong get_timer(ulong base) +{ + return get_time_ms() - base; +} + +unsigned long long get_ticks(void) +{ + return get_cpu_global_timer(); +} + +ulong get_tbclk(void) +{ + return (ulong)(CONFIG_SYS_CPU_CLK >> 2); +} |