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Wolfgang Denk6cb142f2006-03-12 02:12:27 +01001/*
2 * U-boot - interrupts.c Interrupt related routines
3 *
Aubrey Li155fd762007-04-05 18:31:18 +08004 * Copyright (c) 2005-2007 Analog Devices Inc.
Wolfgang Denk6cb142f2006-03-12 02:12:27 +01005 *
6 * This file is based on interrupts.c
7 * Copyright 1996 Roman Zippel
8 * Copyright 1999 D. Jeff Dionne <jeff@uclinux.org>
9 * Copyright 2000-2001 Lineo, Inc. D. Jefff Dionne <jeff@lineo.ca>
10 * Copyright 2002 Arcturus Networks Inc. MaTed <mated@sympatico.ca>
11 * Copyright 2003 Metrowerks/Motorola
12 * Copyright 2003 Bas Vermeulen <bas@buyways.nl>,
Aubrey.Li3f0606a2007-03-09 13:38:44 +080013 * BuyWays B.V. (www.buyways.nl)
Wolfgang Denk6cb142f2006-03-12 02:12:27 +010014 *
15 * (C) Copyright 2000-2004
16 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
17
18 * See file CREDITS for list of people who contributed to this
19 * project.
20 *
21 * This program is free software; you can redistribute it and/or
22 * modify it under the terms of the GNU General Public License as
23 * published by the Free Software Foundation; either version 2 of
24 * the License, or (at your option) any later version.
25 *
26 * This program is distributed in the hope that it will be useful,
27 * but WITHOUT ANY WARRANTY; without even the implied warranty of
28 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
29 * GNU General Public License for more details.
30 *
31 * You should have received a copy of the GNU General Public License
32 * along with this program; if not, write to the Free Software
Aubrey Li155fd762007-04-05 18:31:18 +080033 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
34 * MA 02110-1301 USA
Wolfgang Denk6cb142f2006-03-12 02:12:27 +010035 */
36
37#include <common.h>
38#include <asm/machdep.h>
39#include <asm/irq.h>
Aubrey.Li3f0606a2007-03-09 13:38:44 +080040#include <config.h>
41#include <asm/blackfin.h>
Wolfgang Denk6cb142f2006-03-12 02:12:27 +010042#include "cpu.h"
43
44static ulong timestamp;
45static ulong last_time;
46static int int_flag;
47
Aubrey.Li3f0606a2007-03-09 13:38:44 +080048int irq_flags; /* needed by asm-blackfin/system.h */
Wolfgang Denk6cb142f2006-03-12 02:12:27 +010049
50/* Functions just to satisfy the linker */
51
52/*
53 * This function is derived from PowerPC code (read timebase as long long).
54 * On BF533 it just returns the timer value.
55 */
56unsigned long long get_ticks(void)
57{
58 return get_timer(0);
59}
60
61/*
62 * This function is derived from PowerPC code (timebase clock frequency).
63 * On BF533 it returns the number of timer ticks per second.
64 */
Aubrey.Li3f0606a2007-03-09 13:38:44 +080065ulong get_tbclk(void)
Wolfgang Denk6cb142f2006-03-12 02:12:27 +010066{
67 ulong tbclk;
68
69 tbclk = CFG_HZ;
70 return tbclk;
71}
72
73void enable_interrupts(void)
74{
75 restore_flags(int_flag);
76}
77
78int disable_interrupts(void)
79{
80 save_and_cli(int_flag);
81 return 1;
82}
83
84int interrupt_init(void)
85{
86 return (0);
87}
88
89void udelay(unsigned long usec)
90{
91 unsigned long delay, start, stop;
92 unsigned long cclk;
93 cclk = (CONFIG_CCLK_HZ);
94
Aubrey.Li3f0606a2007-03-09 13:38:44 +080095 while (usec > 1) {
96 /*
97 * how many clock ticks to delay?
98 * - request(in useconds) * clock_ticks(Hz) / useconds/second
99 */
Wolfgang Denk6cb142f2006-03-12 02:12:27 +0100100 if (usec < 1000) {
Aubrey.Li3f0606a2007-03-09 13:38:44 +0800101 delay = (usec * (cclk / 244)) >> 12;
Wolfgang Denk6cb142f2006-03-12 02:12:27 +0100102 usec = 0;
103 } else {
Aubrey.Li3f0606a2007-03-09 13:38:44 +0800104 delay = (1000 * (cclk / 244)) >> 12;
Wolfgang Denk6cb142f2006-03-12 02:12:27 +0100105 usec -= 1000;
106 }
107
Aubrey.Li3f0606a2007-03-09 13:38:44 +0800108 asm volatile (" %0 = CYCLES;":"=r" (start));
Wolfgang Denk6cb142f2006-03-12 02:12:27 +0100109 do {
Aubrey.Li3f0606a2007-03-09 13:38:44 +0800110 asm volatile (" %0 = CYCLES; ":"=r" (stop));
Wolfgang Denk6cb142f2006-03-12 02:12:27 +0100111 } while (stop - start < delay);
112 }
113
114 return;
115}
116
117void timer_init(void)
118{
119 *pTCNTL = 0x1;
120 *pTSCALE = 0x0;
Aubrey.Li3f0606a2007-03-09 13:38:44 +0800121 *pTCOUNT = MAX_TIM_LOAD;
Wolfgang Denk6cb142f2006-03-12 02:12:27 +0100122 *pTPERIOD = MAX_TIM_LOAD;
123 *pTCNTL = 0x7;
124 asm("CSYNC;");
125
126 timestamp = 0;
127 last_time = 0;
128}
129
130/* Any network command or flash
131 * command is started get_timer shall
132 * be called before TCOUNT gets reset,
133 * to implement the accurate timeouts.
134 *
135 * How ever milliconds doesn't return
136 * the number that has been elapsed from
137 * the last reset.
138 *
139 * As get_timer is used in the u-boot
140 * only for timeouts this should be
141 * sufficient
142 */
143ulong get_timer(ulong base)
144{
145 ulong milisec;
146
147 /* Number of clocks elapsed */
148 ulong clocks = (MAX_TIM_LOAD - (*pTCOUNT));
149
Aubrey.Li3f0606a2007-03-09 13:38:44 +0800150 /**
151 * Find if the TCOUNT is reset
152 * timestamp gives the number of times
153 * TCOUNT got reset
154 */
155 if (clocks < last_time)
Wolfgang Denk6cb142f2006-03-12 02:12:27 +0100156 timestamp++;
157 last_time = clocks;
158
159 /* Get the number of milliseconds */
Aubrey.Li3f0606a2007-03-09 13:38:44 +0800160 milisec = clocks / (CONFIG_CCLK_HZ / 1000);
Wolfgang Denk6cb142f2006-03-12 02:12:27 +0100161
Aubrey.Li3f0606a2007-03-09 13:38:44 +0800162 /**
163 * Find the number of millisonds
164 * that got elapsed before this TCOUNT cycle
165 */
166 milisec += timestamp * (MAX_TIM_LOAD / (CONFIG_CCLK_HZ / 1000));
Wolfgang Denk6cb142f2006-03-12 02:12:27 +0100167
168 return (milisec - base);
169}