mirror of
https://github.com/smaeul/u-boot.git
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175 lines
3.8 KiB
C
175 lines
3.8 KiB
C
/*
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* U-boot - interrupts.c Interrupt related routines
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*
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* Copyright (c) 2005-2007 Analog Devices Inc.
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*
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* This file is based on interrupts.c
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* Copyright 1996 Roman Zippel
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* Copyright 1999 D. Jeff Dionne <jeff@uclinux.org>
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* Copyright 2000-2001 Lineo, Inc. D. Jefff Dionne <jeff@lineo.ca>
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* Copyright 2002 Arcturus Networks Inc. MaTed <mated@sympatico.ca>
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* Copyright 2003 Metrowerks/Motorola
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* Copyright 2003 Bas Vermeulen <bas@buyways.nl>,
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* BuyWays B.V. (www.buyways.nl)
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*
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* (C) Copyright 2000-2004
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*/
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#include <common.h>
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#include <asm/machdep.h>
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#include <asm/irq.h>
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#include <config.h>
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#include <asm/blackfin.h>
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#include "cpu.h"
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static ulong timestamp;
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static ulong last_time;
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static int int_flag;
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int irq_flags; /* needed by asm-blackfin/system.h */
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/* Functions just to satisfy the linker */
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/*
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* This function is derived from PowerPC code (read timebase as long long).
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* On BF533 it just returns the timer value.
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*/
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unsigned long long get_ticks(void)
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{
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return get_timer(0);
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}
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/*
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* This function is derived from PowerPC code (timebase clock frequency).
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* On BF533 it returns the number of timer ticks per second.
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*/
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ulong get_tbclk (void)
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{
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ulong tbclk;
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tbclk = CFG_HZ;
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return tbclk;
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}
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void enable_interrupts(void)
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{
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restore_flags(int_flag);
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}
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int disable_interrupts(void)
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{
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save_and_cli(int_flag);
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return 1;
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}
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int interrupt_init(void)
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{
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return (0);
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}
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void udelay(unsigned long usec)
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{
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unsigned long delay, start, stop;
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unsigned long cclk;
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cclk = (CONFIG_CCLK_HZ);
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while (usec > 1) {
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/*
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* how many clock ticks to delay?
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* - request(in useconds) * clock_ticks(Hz) / useconds/second
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*/
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if (usec < 1000) {
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delay = (usec * (cclk / 244)) >> 12;
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usec = 0;
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} else {
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delay = (1000 * (cclk / 244)) >> 12;
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usec -= 1000;
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}
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asm volatile (" %0 = CYCLES;":"=r" (start));
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do {
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asm volatile (" %0 = CYCLES; ":"=r" (stop));
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} while (stop - start < delay);
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}
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return;
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}
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void timer_init(void)
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{
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*pTCNTL = 0x1;
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*pTSCALE = 0x0;
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*pTCOUNT = MAX_TIM_LOAD;
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*pTPERIOD = MAX_TIM_LOAD;
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*pTCNTL = 0x7;
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asm("CSYNC;");
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timestamp = 0;
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last_time = 0;
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}
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/* Any network command or flash
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* command is started get_timer shall
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* be called before TCOUNT gets reset,
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* to implement the accurate timeouts.
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*
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* How ever milliconds doesn't return
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* the number that has been elapsed from
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* the last reset.
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*
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* As get_timer is used in the u-boot
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* only for timeouts this should be
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* sufficient
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*/
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ulong get_timer(ulong base)
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{
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ulong milisec;
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/* Number of clocks elapsed */
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ulong clocks = (MAX_TIM_LOAD - (*pTCOUNT));
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/**
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* Find if the TCOUNT is reset
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* timestamp gives the number of times
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* TCOUNT got reset
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*/
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if (clocks < last_time)
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timestamp++;
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last_time = clocks;
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/* Get the number of milliseconds */
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milisec = clocks / (CONFIG_CCLK_HZ / 1000);
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/**
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* Find the number of millisonds
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* that got elapsed before this TCOUNT cycle
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*/
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milisec += timestamp * (MAX_TIM_LOAD / (CONFIG_CCLK_HZ / 1000));
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return (milisec - base);
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}
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void reset_timer (void)
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{
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timestamp = 0;
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}
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