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- /*
- * Copyright (C) 2007,2008 Nobobuhiro Iwamatsu <iwamatsu@nigauri.org>
- * Copyright (C) 2008 Renesas Solutions Corp.
- *
- * (C) Copyright 2003
- * 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 <common.h>
- #include <asm/io.h>
- #include <asm/processor.h>
- #define CMT_CMCSR_INIT 0x0001 /* PCLK/32 */
- #define CMT_CMCSR_CALIB 0x0000
- #define CMT_MAX_COUNTER (0xFFFFFFFF)
- #define CMT_TIMER_RESET (0xFFFF)
- static vu_long cmt0_timer;
- static void cmt_timer_start(unsigned int timer)
- {
- writew(readw(CMSTR) | 0x01, CMSTR);
- }
- static void cmt_timer_stop(unsigned int timer)
- {
- writew(readw(CMSTR) & ~0x01, CMSTR);
- }
- int timer_init(void)
- {
- cmt0_timer = 0;
- /* Divide clock by 32 */
- readw(CMCSR_0);
- writew(CMT_CMCSR_INIT, CMCSR_0);
- /* User Device 0 only */
- cmt_timer_stop(0);
- set_timer(CMT_TIMER_RESET);
- cmt_timer_start(0);
- return 0;
- }
- unsigned long long get_ticks(void)
- {
- return cmt0_timer;
- }
- static vu_long cmcnt;
- ulong get_timer(ulong base)
- {
- ulong data = readw(CMCNT_0);
- if (data >= cmcnt)
- cmcnt = data - cmcnt;
- else
- cmcnt = (CMT_TIMER_RESET - cmcnt) + data;
- if ((cmt0_timer + cmcnt) > CMT_MAX_COUNTER)
- cmt0_timer = ((cmt0_timer + cmcnt) - CMT_MAX_COUNTER);
- else
- cmt0_timer += cmcnt;
- cmcnt = data;
- return cmt0_timer - base;
- }
- void set_timer(ulong t)
- {
- writew((u16) t, CMCOR_0);
- }
- void reset_timer(void)
- {
- cmt_timer_stop(0);
- set_timer(CMT_TIMER_RESET);
- cmt0_timer = 0;
- cmt_timer_start(0);
- }
- void udelay(unsigned long usec)
- {
- unsigned int start = get_timer(0);
- while (get_timer((ulong) start) < (usec * (CFG_HZ / 1000000)))
- continue;
- }
- unsigned long get_tbclk(void)
- {
- return CFG_HZ;
- }
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