3 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
4 * Marius Groeger <mgroeger@sysgo.de>
7 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
8 * Alex Zuepke <azu@sysgo.de>
11 * Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
14 * Ilya Yanok, Emcraft Systems Ltd, <yanok@emcraft.com>
16 * (C) Copyright 2009 DENX Software Engineering
17 * Author: John Rigby <jrigby@gmail.com>
18 * Add support for MX25
20 * See file CREDITS for list of people who contributed to this
23 * This program is free software; you can redistribute it and/or
24 * modify it under the terms of the GNU General Public License as
25 * published by the Free Software Foundation; either version 2 of
26 * the License, or (at your option) any later version.
28 * This program is distributed in the hope that it will be useful,
29 * but WITHOUT ANY WARRANTY; without even the implied warranty of
30 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
31 * GNU General Public License for more details.
33 * You should have received a copy of the GNU General Public License
34 * along with this program; if not, write to the Free Software
35 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
42 #include <linux/types.h>
43 #include <asm/arch/regs_global.h>
44 #include <asm/arch/bits.h>
45 #include <asm/arch/regs_syscnt.h>
48 static unsigned long long timestamp;
52 * "time" is measured in 1 / CONFIG_SYS_HZ seconds,
53 * "tick" is internal timer period
55 static inline unsigned long long tick_to_time(unsigned long long tick)
57 tick *= CONFIG_SYS_HZ;
58 do_div(tick, CONFIG_SPRD_TIMER_CLK);
62 static inline unsigned long long time_to_tick(unsigned long long time)
64 time *= CONFIG_SPRD_TIMER_CLK;
65 do_div(time, CONFIG_SYS_HZ);
69 static inline unsigned long long us_to_tick(unsigned long long us)
71 us = us*CONFIG_SPRD_TIMER_CLK;
72 do_div(us, CONFIG_SYS_HZ*1000);
77 /* nothing really to do with interrupts, just starts up a counter. */
78 /* The 32KHz 23-bit timer overruns in 512 seconds */
82 //Enable System Counter device
83 REG32(GR_GEN1) |= GEN1_SYSCLK_EN;
88 void reset_timer(void)
90 //capture current incrementer value time
91 lastinc = readl(SYSCNT_COUNT);
94 void reset_timer_masked(void)
98 unsigned long long get_ticks(void)
100 ulong now = readl(SYSCNT_COUNT);
104 * move stamp forward with absolut diff ticks
106 timestamp += (now - lastinc);
109 timestamp += (TIMER_MAX_VALUE - lastinc) + now;
115 ulong get_timer_masked(void)
117 return tick_to_time(get_ticks());
120 ulong get_timer(ulong base)
122 return get_timer_masked() - base;
125 void set_timer(ulong t)
127 timestamp = time_to_tick(t);
130 void __udelay (unsigned long usec)
132 unsigned long long tmp;
135 tmo = us_to_tick(usec);
136 tmp = get_ticks() + tmo; // get current timestamp
138 while(get_ticks() < tmp) //loop till event