160 lines
3.2 KiB
C
160 lines
3.2 KiB
C
/*
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* U-boot - interrupts.c Interrupt related routines
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*
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* Copyright (c) 2005-2008 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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*
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* Licensed under the GPL-2 or later.
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*/
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#include <common.h>
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#include <config.h>
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#include <watchdog.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 Blackfin 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 Blackfin 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 = CONFIG_SYS_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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local_irq_restore(int_flag);
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}
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int disable_interrupts(void)
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{
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local_irq_save(int_flag);
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return 1;
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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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WATCHDOG_RESET();
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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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#define MAX_TIM_LOAD 0xFFFFFFFF
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int timer_init(void)
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{
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bfin_write_TCNTL(0x1);
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CSYNC();
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bfin_write_TSCALE(0x0);
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bfin_write_TCOUNT(MAX_TIM_LOAD);
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bfin_write_TPERIOD(MAX_TIM_LOAD);
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bfin_write_TCNTL(0x7);
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CSYNC();
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timestamp = 0;
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last_time = 0;
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return 0;
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}
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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 - bfin_read_TCOUNT());
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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 that
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* 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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timer_init();
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}
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