mirror of
https://github.com/AsahiLinux/u-boot
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111 lines
2.4 KiB
C
111 lines
2.4 KiB
C
/*
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* Copyright (C) 2007,2008 Nobobuhiro Iwamatsu <iwamatsu@nigauri.org>
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* Copyright (C) 2008 Renesas Solutions Corp.
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*
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* (C) Copyright 2003
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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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/processor.h>
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#define CMT_CMCSR_INIT 0x0001 /* PCLK/32 */
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#define CMT_CMCSR_CALIB 0x0000
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#define CMT_MAX_COUNTER (0xFFFFFFFF)
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#define CMT_TIMER_RESET (0xFFFF)
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static vu_long cmt0_timer;
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static void cmt_timer_start(unsigned int timer)
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{
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writew(readw(CMSTR) | 0x01, CMSTR);
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}
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static void cmt_timer_stop(unsigned int timer)
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{
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writew(readw(CMSTR) & ~0x01, CMSTR);
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}
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int timer_init(void)
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{
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cmt0_timer = 0;
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/* Divide clock by 32 */
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readw(CMCSR_0);
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writew(CMT_CMCSR_INIT, CMCSR_0);
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/* User Device 0 only */
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cmt_timer_stop(0);
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set_timer(CMT_TIMER_RESET);
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cmt_timer_start(0);
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return 0;
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}
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unsigned long long get_ticks(void)
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{
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return cmt0_timer;
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}
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static vu_long cmcnt;
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ulong get_timer(ulong base)
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{
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ulong data = readw(CMCNT_0);
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if (data >= cmcnt)
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cmcnt = data - cmcnt;
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else
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cmcnt = (CMT_TIMER_RESET - cmcnt) + data;
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if ((cmt0_timer + cmcnt) > CMT_MAX_COUNTER)
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cmt0_timer = ((cmt0_timer + cmcnt) - CMT_MAX_COUNTER);
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else
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cmt0_timer += cmcnt;
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cmcnt = data;
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return cmt0_timer - base;
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}
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void set_timer(ulong t)
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{
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writew((u16) t, CMCOR_0);
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}
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void reset_timer(void)
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{
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cmt_timer_stop(0);
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set_timer(CMT_TIMER_RESET);
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cmt0_timer = 0;
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cmt_timer_start(0);
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}
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void udelay(unsigned long usec)
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{
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unsigned int start = get_timer(0);
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while (get_timer((ulong) start) < (usec * (CONFIG_SYS_HZ / 1000000)))
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continue;
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}
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unsigned long get_tbclk(void)
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{
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return CONFIG_SYS_HZ;
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}
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