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/*
* (C) Copyright 2008
* Ricado Ribalda-Universidad Autonoma de Madrid-ricardo.ribalda@uam.es
* This work has been supported by: QTechnology http://qtec.com/
* Based on interrupts.c Wolfgang Denk-DENX Software Engineering-wd@denx.de
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <common.h>
#include <watchdog.h>
#include <command.h>
#include <asm/processor.h>
#include <asm/interrupt.h>
#include <ppc4xx.h>
#include <ppc_asm.tmpl>
#include <commproc.h>
#include <asm/io.h>
#include <asm/xilinx_irq.h>
DECLARE_GLOBAL_DATA_PTR;
void pic_enable(void)
{
debug("Xilinx PIC at 0x%8x\n", intc);
/*
* Disable all external interrupts until they are
* explicitly requested.
*/
out_be32((u32 *) IER, 0);
/* Acknowledge any pending interrupts just in case. */
out_be32((u32 *) IAR, 0xffffffff);
/* Turn on the Master Enable. */
out_be32((u32 *) MER, 0x3UL);
return;
}
int xilinx_pic_irq_get(void)
{
u32 irq;
irq = in_be32((u32 *) IVR);
/* If no interrupt is pending then all bits of the IVR are set to 1. As
* the IVR is as many bits wide as numbers of inputs are available.
* Therefore, if all bits of the IVR are set to one, its content will
* be bigger than XPAR_INTC_MAX_NUM_INTR_INPUTS.
*/
if (irq >= XPAR_INTC_MAX_NUM_INTR_INPUTS)
irq = -1; /* report no pending interrupt. */
debug("get_irq: %d\n", irq);
return (irq);
}
void pic_irq_enable(unsigned int irq)
{
u32 mask = IRQ_MASK(irq);
debug("enable: %d\n", irq);
out_be32((u32 *) SIE, mask);
}
void pic_irq_disable(unsigned int irq)
{
u32 mask = IRQ_MASK(irq);
debug("disable: %d\n", irq);
out_be32((u32 *) CIE, mask);
}
void pic_irq_ack(unsigned int irq)
{
u32 mask = IRQ_MASK(irq);
debug("ack: %d\n", irq);
out_be32((u32 *) IAR, mask);
}
void external_interrupt(struct pt_regs *regs)
{
int irq;
irq = xilinx_pic_irq_get();
if (irq < 0)
return;
interrupt_run_handler(irq);
return;
}
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