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wdenk2d5b5612003-10-14 19:43:55 +00001/*
Wolfgang Denkba94a1b2006-05-30 15:56:48 +02002 * (C) Copyright 2006
3 * Stefan Roese, DENX Software Engineering, sr@denx.de.
4 *
wdenk2d5b5612003-10-14 19:43:55 +00005 * (C) Copyright 2002
6 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
7 * Marius Groeger <mgroeger@sysgo.de>
8 *
9 * (C) Copyright 2002
10 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
11 * Alex Zuepke <azu@sysgo.de>
12 *
13 * See file CREDITS for list of people who contributed to this
14 * project.
15 *
16 * This program is free software; you can redistribute it and/or
17 * modify it under the terms of the GNU General Public License as
18 * published by the Free Software Foundation; either version 2 of
19 * the License, or (at your option) any later version.
20 *
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
25 *
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
29 * MA 02111-1307 USA
30 */
31
32#include <common.h>
33#include <asm/arch/ixp425.h>
34
Jean-Christophe PLAGNIOL-VILLARDb54384e2009-05-15 23:47:02 +020035#ifdef CONFIG_TIMER_IRQ
36
37#define FREQ 66666666
38#define CLOCK_TICK_RATE (((FREQ / CONFIG_SYS_HZ & ~IXP425_OST_RELOAD_MASK) + 1) * CONFIG_SYS_HZ)
39#define LATCH ((CLOCK_TICK_RATE + CONFIG_SYS_HZ/2) / CONFIG_SYS_HZ) /* For divider */
40
41/*
42 * When interrupts are enabled, use timer 2 for time/delay generation...
43 */
44
45static volatile ulong timestamp;
46
47static void timer_isr(void *data)
48{
49 unsigned int *pTime = (unsigned int *)data;
50
51 (*pTime)++;
52
53 /*
54 * Reset IRQ source
55 */
56 *IXP425_OSST = IXP425_OSST_TIMER_2_PEND;
57}
58
59ulong get_timer (ulong base)
60{
61 return timestamp - base;
62}
63
64void reset_timer (void)
65{
66 timestamp = 0;
67}
68
69int timer_init (void)
70{
71 /* install interrupt handler for timer */
72 irq_install_handler(IXP425_TIMER_2_IRQ, timer_isr, (void *)&timestamp);
73
74 /* setup the Timer counter value */
75 *IXP425_OSRT2 = (LATCH & ~IXP425_OST_RELOAD_MASK) | IXP425_OST_ENABLE;
76
77 /* enable timer irq */
78 *IXP425_ICMR = (1 << IXP425_TIMER_2_IRQ);
79
80 return 0;
81}
82#else
wdenkb13fb012003-10-30 21:49:38 +000083ulong get_timer (ulong base)
84{
85 return get_timer_masked () - base;
86}
87
wdenk2d5b5612003-10-14 19:43:55 +000088void ixp425_udelay(unsigned long usec)
89{
90 /*
91 * This function has a max usec, but since it is called from udelay
92 * we should not have to worry... be happy
93 */
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +020094 unsigned long usecs = CONFIG_SYS_HZ/1000000L & ~IXP425_OST_RELOAD_MASK;
wdenk2d5b5612003-10-14 19:43:55 +000095
96 *IXP425_OSST = IXP425_OSST_TIMER_1_PEND;
97 usecs |= IXP425_OST_ONE_SHOT | IXP425_OST_ENABLE;
98 *IXP425_OSRT1 = usecs;
99 while (!(*IXP425_OSST & IXP425_OSST_TIMER_1_PEND));
100}
101
102void udelay (unsigned long usec)
103{
104 while (usec--) ixp425_udelay(1);
105}
106
107static ulong reload_constant = 0xfffffff0;
108
109void reset_timer_masked (void)
110{
111 ulong reload = reload_constant | IXP425_OST_ONE_SHOT | IXP425_OST_ENABLE;
112
113 *IXP425_OSST = IXP425_OSST_TIMER_1_PEND;
114 *IXP425_OSRT1 = reload;
115}
116
117ulong get_timer_masked (void)
118{
119 /*
120 * Note that it is possible for this to wrap!
121 * In this case we return max.
122 */
123 ulong current = *IXP425_OST1;
124 if (*IXP425_OSST & IXP425_OSST_TIMER_1_PEND)
125 {
126 return reload_constant;
127 }
128 return (reload_constant - current);
129}
Jean-Christophe PLAGNIOL-VILLARDb54384e2009-05-15 23:47:02 +0200130
131int timer_init(void)
132{
133 return 0;
134}
135#endif