mirror of
https://github.com/AsahiLinux/u-boot
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125 lines
2.9 KiB
C
125 lines
2.9 KiB
C
/*
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* (C) Copyright 2006
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* Stefan Roese, DENX Software Engineering, sr@denx.de.
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*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Marius Groeger <mgroeger@sysgo.de>
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*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Alex Zuepke <azu@sysgo.de>
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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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#include <common.h>
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#include <asm/arch/ixp425.h>
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#ifdef CONFIG_USE_IRQ
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#include <asm/proc-armv/ptrace.h>
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/*
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* When interrupts are enabled, use timer 2 for time/delay generation...
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*/
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#define FREQ 66666666
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#define CLOCK_TICK_RATE (((FREQ / CONFIG_SYS_HZ & ~IXP425_OST_RELOAD_MASK) + 1) * CONFIG_SYS_HZ)
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#define LATCH ((CLOCK_TICK_RATE + CONFIG_SYS_HZ/2) / CONFIG_SYS_HZ) /* For divider */
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struct _irq_handler {
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void *m_data;
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void (*m_func)( void *data);
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};
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static struct _irq_handler IRQ_HANDLER[N_IRQS];
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static volatile ulong timestamp;
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static void default_isr(void *data)
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{
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printf("default_isr(): called for IRQ %d, Interrupt Status=%x PR=%x\n",
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(int)data, *IXP425_ICIP, *IXP425_ICIH);
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}
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static int next_irq(void)
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{
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return (((*IXP425_ICIH & 0x000000fc) >> 2) - 1);
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}
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static void timer_isr(void *data)
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{
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unsigned int *pTime = (unsigned int *)data;
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(*pTime)++;
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/*
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* Reset IRQ source
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*/
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*IXP425_OSST = IXP425_OSST_TIMER_2_PEND;
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}
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ulong get_timer (ulong base)
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{
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return timestamp - 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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#endif /* #ifdef CONFIG_USE_IRQ */
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#ifdef CONFIG_USE_IRQ
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void do_irq (struct pt_regs *pt_regs)
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{
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int irq = next_irq();
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IRQ_HANDLER[irq].m_func(IRQ_HANDLER[irq].m_data);
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}
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#endif
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int interrupt_init (void)
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{
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#ifdef CONFIG_USE_IRQ
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int i;
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/* install default interrupt handlers */
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for (i = 0; i < N_IRQS; i++) {
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IRQ_HANDLER[i].m_data = (void *)i;
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IRQ_HANDLER[i].m_func = default_isr;
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}
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/* install interrupt handler for timer */
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IRQ_HANDLER[IXP425_TIMER_2_IRQ].m_data = (void *)×tamp;
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IRQ_HANDLER[IXP425_TIMER_2_IRQ].m_func = timer_isr;
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/* setup the Timer counter value */
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*IXP425_OSRT2 = (LATCH & ~IXP425_OST_RELOAD_MASK) | IXP425_OST_ENABLE;
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/* configure interrupts for IRQ mode */
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*IXP425_ICLR = 0x00000000;
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/* enable timer irq */
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*IXP425_ICMR = (1 << IXP425_TIMER_2_IRQ);
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#endif
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return (0);
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}
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