blob: d4dd63610106012bf5a6b307f200a9b98dd2af5d [file] [log] [blame]
Aubrey Li65458982007-03-20 18:16:24 +08001/*
2 * U-boot - interrupts.c Interrupt related routines
3 *
Mike Frysinger9171fc82008-03-30 15:46:13 -04004 * Copyright (c) 2005-2008 Analog Devices Inc.
Aubrey Li65458982007-03-20 18:16:24 +08005 *
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>,
13 * BuyWays B.V. (www.buyways.nl)
14 *
15 * (C) Copyright 2000-2004
16 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
Aubrey Li65458982007-03-20 18:16:24 +080017 *
Mike Frysinger9171fc82008-03-30 15:46:13 -040018 * Licensed under the GPL-2 or later.
Aubrey Li65458982007-03-20 18:16:24 +080019 */
20
21#include <common.h>
Aubrey Li65458982007-03-20 18:16:24 +080022#include <config.h>
23#include <asm/blackfin.h>
24#include "cpu.h"
25
26static ulong timestamp;
27static ulong last_time;
28static int int_flag;
29
30int irq_flags; /* needed by asm-blackfin/system.h */
31
32/* Functions just to satisfy the linker */
33
34/*
35 * This function is derived from PowerPC code (read timebase as long long).
Mike Frysinger9171fc82008-03-30 15:46:13 -040036 * On Blackfin it just returns the timer value.
Aubrey Li65458982007-03-20 18:16:24 +080037 */
38unsigned long long get_ticks(void)
39{
40 return get_timer(0);
41}
42
43/*
44 * This function is derived from PowerPC code (timebase clock frequency).
Mike Frysinger9171fc82008-03-30 15:46:13 -040045 * On Blackfin it returns the number of timer ticks per second.
Aubrey Li65458982007-03-20 18:16:24 +080046 */
47ulong get_tbclk(void)
48{
49 ulong tbclk;
50
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +020051 tbclk = CONFIG_SYS_HZ;
Aubrey Li65458982007-03-20 18:16:24 +080052 return tbclk;
53}
54
55void enable_interrupts(void)
56{
Mike Frysinger9171fc82008-03-30 15:46:13 -040057 local_irq_restore(int_flag);
Aubrey Li65458982007-03-20 18:16:24 +080058}
59
60int disable_interrupts(void)
61{
Mike Frysinger9171fc82008-03-30 15:46:13 -040062 local_irq_save(int_flag);
Aubrey Li65458982007-03-20 18:16:24 +080063 return 1;
64}
65
Aubrey Li65458982007-03-20 18:16:24 +080066void udelay(unsigned long usec)
67{
68 unsigned long delay, start, stop;
69 unsigned long cclk;
70 cclk = (CONFIG_CCLK_HZ);
71
72 while (usec > 1) {
73 /*
74 * how many clock ticks to delay?
75 * - request(in useconds) * clock_ticks(Hz) / useconds/second
76 */
77 if (usec < 1000) {
78 delay = (usec * (cclk / 244)) >> 12;
79 usec = 0;
80 } else {
81 delay = (1000 * (cclk / 244)) >> 12;
82 usec -= 1000;
83 }
84
Mike Frysinger9171fc82008-03-30 15:46:13 -040085 asm volatile (" %0 = CYCLES;" : "=r" (start));
Aubrey Li65458982007-03-20 18:16:24 +080086 do {
Mike Frysinger9171fc82008-03-30 15:46:13 -040087 asm volatile (" %0 = CYCLES; " : "=r" (stop));
Aubrey Li65458982007-03-20 18:16:24 +080088 } while (stop - start < delay);
89 }
90
91 return;
92}
93
Mike Frysinger9171fc82008-03-30 15:46:13 -040094#define MAX_TIM_LOAD 0xFFFFFFFF
95int timer_init(void)
Aubrey Li65458982007-03-20 18:16:24 +080096{
97 *pTCNTL = 0x1;
98 *pTSCALE = 0x0;
99 *pTCOUNT = MAX_TIM_LOAD;
100 *pTPERIOD = MAX_TIM_LOAD;
101 *pTCNTL = 0x7;
102 asm("CSYNC;");
103
104 timestamp = 0;
105 last_time = 0;
Mike Frysinger9171fc82008-03-30 15:46:13 -0400106
107 return 0;
Aubrey Li65458982007-03-20 18:16:24 +0800108}
109
110/*
111 * Any network command or flash
112 * command is started get_timer shall
113 * be called before TCOUNT gets reset,
114 * to implement the accurate timeouts.
115 *
116 * How ever milliconds doesn't return
117 * the number that has been elapsed from
118 * the last reset.
119 *
120 * As get_timer is used in the u-boot
121 * only for timeouts this should be
122 * sufficient
123 */
124ulong get_timer(ulong base)
125{
126 ulong milisec;
127
128 /* Number of clocks elapsed */
129 ulong clocks = (MAX_TIM_LOAD - (*pTCOUNT));
130
131 /*
132 * Find if the TCOUNT is reset
133 * timestamp gives the number of times
134 * TCOUNT got reset
135 */
136 if (clocks < last_time)
137 timestamp++;
138 last_time = clocks;
139
140 /* Get the number of milliseconds */
141 milisec = clocks / (CONFIG_CCLK_HZ / 1000);
142
143 /*
Mike Frysinger9171fc82008-03-30 15:46:13 -0400144 * Find the number of millisonds that
145 * got elapsed before this TCOUNT cycle
Aubrey Li65458982007-03-20 18:16:24 +0800146 */
147 milisec += timestamp * (MAX_TIM_LOAD / (CONFIG_CCLK_HZ / 1000));
148
149 return (milisec - base);
150}
Mike Frysinger9171fc82008-03-30 15:46:13 -0400151
152void reset_timer(void)
153{
154 timestamp = 0;
155}