3 * Michael Schwingen, michael@schwingen.org
6 * Stefan Roese, DENX Software Engineering, sr@denx.de.
9 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
10 * Marius Groeger <mgroeger@sysgo.de>
13 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
14 * Alex Zuepke <azu@sysgo.de>
16 * See file CREDITS for list of people who contributed to this
19 * This program is free software; you can redistribute it and/or
20 * modify it under the terms of the GNU General Public License as
21 * published by the Free Software Foundation; either version 2 of
22 * the License, or (at your option) any later version.
24 * This program is distributed in the hope that it will be useful,
25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
27 * GNU General Public License for more details.
29 * You should have received a copy of the GNU General Public License
30 * along with this program; if not, write to the Free Software
31 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
36 #include <asm/arch/ixp425.h>
40 DECLARE_GLOBAL_DATA_PTR;
43 * The IXP42x time-stamp timer runs at 2*OSC_IN (66.666MHz when using a
46 static inline unsigned long long tick_to_time(unsigned long long tick)
48 tick *= CONFIG_SYS_HZ;
49 do_div(tick, CONFIG_IXP425_TIMER_CLK);
53 static inline unsigned long long time_to_tick(unsigned long long time)
55 time *= CONFIG_IXP425_TIMER_CLK;
56 do_div(time, CONFIG_SYS_HZ);
60 static inline unsigned long long us_to_tick(unsigned long long us)
62 us = us * CONFIG_IXP425_TIMER_CLK + 999999;
67 unsigned long long get_ticks(void)
69 ulong now = readl(IXP425_OSTS_B);
71 if (readl(IXP425_OSST) & IXP425_OSST_TIMER_TS_PEND) {
72 /* rollover of timestamp timer register */
73 gd->timestamp += (0xFFFFFFFF - gd->lastinc) + now + 1;
74 writel(IXP425_OSST_TIMER_TS_PEND, IXP425_OSST);
76 /* move stamp forward with absolut diff ticks */
77 gd->timestamp += (now - gd->lastinc);
84 void reset_timer_masked(void)
86 /* capture current timestamp counter */
87 gd->lastinc = readl(IXP425_OSTS_B);
88 /* start "advancing" time stamp from 0 */
92 ulong get_timer_masked(void)
94 return tick_to_time(get_ticks());
97 ulong get_timer(ulong base)
99 return get_timer_masked() - base;
102 /* delay x useconds AND preserve advance timestamp value */
103 void __udelay(unsigned long usec)
105 unsigned long long tmp;
107 tmp = get_ticks() + us_to_tick(usec);
109 while (get_ticks() < tmp)
115 writel(IXP425_OSST_TIMER_TS_PEND, IXP425_OSST);