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https://github.com/AsahiLinux/u-boot
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4fb44e22ec
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>
97 lines
2.2 KiB
C
97 lines
2.2 KiB
C
/*
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* (C) Copyright 2012 Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
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* (C) Copyright 2012 Renesas Solutions Corp.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <asm/arch-armv7/globaltimer.h>
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#include <asm/arch/rmobile.h>
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static struct globaltimer *global_timer = \
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(struct globaltimer *)GLOBAL_TIMER_BASE_ADDR;
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#define CLK2MHZ(clk) (clk / 1000 / 1000)
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static u64 get_cpu_global_timer(void)
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{
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u32 low, high;
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u64 timer;
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u32 old = readl(&global_timer->cnt_h);
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while (1) {
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low = readl(&global_timer->cnt_l);
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high = readl(&global_timer->cnt_h);
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if (old == high)
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break;
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else
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old = high;
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}
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timer = high;
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return (u64)((timer << 32) | low);
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}
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static u64 get_time_us(void)
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{
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u64 timer = get_cpu_global_timer();
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timer = ((timer << 2) + (CLK2MHZ(CONFIG_SYS_CPU_CLK) >> 1));
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timer /= (u64)CLK2MHZ(CONFIG_SYS_CPU_CLK);
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return timer;
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}
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static ulong get_time_ms(void)
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{
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return (ulong)(get_time_us() / 1000);
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}
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int timer_init(void)
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{
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writel(0x01, &global_timer->ctl);
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return 0;
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}
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void __udelay(unsigned long usec)
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{
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u64 start, current;
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u64 wait;
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start = get_cpu_global_timer();
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wait = (u64)((usec * CLK2MHZ(CONFIG_SYS_CPU_CLK)) >> 2);
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do {
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current = get_cpu_global_timer();
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} while ((current - start) < wait);
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}
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ulong get_timer(ulong base)
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{
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return get_time_ms() - base;
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}
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unsigned long long get_ticks(void)
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{
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return get_cpu_global_timer();
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}
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ulong get_tbclk(void)
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{
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return (ulong)(CONFIG_SYS_CPU_CLK >> 2);
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}
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