mirror of
https://github.com/AsahiLinux/u-boot
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180 lines
3.6 KiB
C
180 lines
3.6 KiB
C
/*
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* (C) Copyright -2003
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* (C) Copyright 2001
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* Josh Huber <huber@mclx.com>, Mission Critical Linux, Inc.
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*
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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., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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/*
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* interrupts.c - just enough support for the decrementer/timer
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*/
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#include <common.h>
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#include <asm/processor.h>
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#include <command.h>
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/****************************************************************************/
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unsigned decrementer_count; /* count value for 1e6/HZ microseconds */
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/****************************************************************************/
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static __inline__ unsigned long
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get_msr(void)
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{
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unsigned long msr;
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asm volatile("mfmsr %0" : "=r" (msr) :);
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return msr;
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}
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static __inline__ void
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set_msr(unsigned long msr)
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{
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asm volatile("mtmsr %0" : : "r" (msr));
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}
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static __inline__ unsigned long
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get_dec(void)
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{
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unsigned long val;
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asm volatile("mfdec %0" : "=r" (val) :);
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return val;
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}
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static __inline__ void
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set_dec(unsigned long val)
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{
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asm volatile("mtdec %0" : : "r" (val));
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}
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void
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enable_interrupts(void)
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{
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set_msr (get_msr() | MSR_EE);
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}
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/* returns flag if MSR_EE was set before */
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int
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disable_interrupts(void)
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{
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ulong msr = get_msr();
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set_msr (msr & ~MSR_EE);
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return ((msr & MSR_EE) != 0);
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}
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/****************************************************************************/
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int interrupt_init(void)
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{
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decrementer_count = get_tbclk() / CFG_HZ;
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#ifdef DEBUG
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puts("interrupt_init: setting actual decremter\n");
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#endif
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set_dec (get_tbclk() / CFG_HZ);
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#ifdef DEBUG
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printf("interrupt_init: enabling interrupts (msr = %08lx)\n",
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get_msr());
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#endif
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set_msr (get_msr() | MSR_EE);
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#ifdef DEBUG
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printf("interrupt_init: done. (msr = %08lx)\n", get_msr());
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#endif
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return (0);
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}
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/****************************************************************************/
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/*
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* Handle external interrupts
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*/
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void
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external_interrupt(struct pt_regs *regs)
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{
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puts("external_interrupt (oops!)\n");
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}
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volatile ulong timestamp = 0;
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/*
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* timer_interrupt - gets called when the decrementer overflows,
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* with interrupts disabled.
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* Trivial implementation - no need to be really accurate.
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*/
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void
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timer_interrupt(struct pt_regs *regs)
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{
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set_dec(decrementer_count);
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timestamp++;
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}
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/****************************************************************************/
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void
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reset_timer(void)
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{
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timestamp = 0;
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}
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ulong
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get_timer(ulong base)
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{
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return (timestamp - base);
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}
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void
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set_timer(ulong t)
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{
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timestamp = t;
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}
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/****************************************************************************/
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/*
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* Install and free a interrupt handler.
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*/
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void
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irq_install_handler(int vec, interrupt_handler_t *handler, void *arg)
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{
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}
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void
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irq_free_handler(int vec)
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{
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}
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/****************************************************************************/
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void
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do_irqinfo(cmd_tbl_t *cmdtp, bd_t *bd, int flag, int argc, char *argv[])
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{
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puts("IRQ related functions are unimplemented currently.\n");
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}
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