115 lines
2.7 KiB
C
115 lines
2.7 KiB
C
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/*
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* arch/mips/vr41xx/nec-cmbvr4133/irq.c
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*
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* Interrupt routines for the NEC CMB-VR4133 board.
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*
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* Author: Yoichi Yuasa <yyuasa@mvista.com, or source@mvista.com> and
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* Alex Sapkov <asapkov@ru.mvista.com>
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*
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* 2003-2004 (c) MontaVista, Software, Inc. This file is licensed under
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* the terms of the GNU General Public License version 2. This program
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* is licensed "as is" without any warranty of any kind, whether express
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* or implied.
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*
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* Support for NEC-CMBVR4133 in 2.6
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* Manish Lachwani (mlachwani@mvista.com)
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*/
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#include <linux/bitops.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/ioport.h>
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#include <linux/interrupt.h>
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#include <asm/io.h>
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#include <asm/vr41xx/cmbvr4133.h>
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extern void enable_8259A_irq(unsigned int irq);
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extern void disable_8259A_irq(unsigned int irq);
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extern void mask_and_ack_8259A(unsigned int irq);
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extern void init_8259A(int hoge);
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extern int vr4133_rockhopper;
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static unsigned int startup_i8259_irq(unsigned int irq)
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{
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enable_8259A_irq(irq - I8259_IRQ_BASE);
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return 0;
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}
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static void shutdown_i8259_irq(unsigned int irq)
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{
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disable_8259A_irq(irq - I8259_IRQ_BASE);
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}
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static void enable_i8259_irq(unsigned int irq)
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{
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enable_8259A_irq(irq - I8259_IRQ_BASE);
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}
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static void disable_i8259_irq(unsigned int irq)
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{
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disable_8259A_irq(irq - I8259_IRQ_BASE);
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}
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static void ack_i8259_irq(unsigned int irq)
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{
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mask_and_ack_8259A(irq - I8259_IRQ_BASE);
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}
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static void end_i8259_irq(unsigned int irq)
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{
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if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
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enable_8259A_irq(irq - I8259_IRQ_BASE);
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}
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static struct hw_interrupt_type i8259_irq_type = {
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.typename = "XT-PIC",
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.startup = startup_i8259_irq,
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.shutdown = shutdown_i8259_irq,
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.enable = enable_i8259_irq,
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.disable = disable_i8259_irq,
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.ack = ack_i8259_irq,
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.end = end_i8259_irq,
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};
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static int i8259_get_irq_number(int irq)
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{
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unsigned long isr;
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isr = inb(0x20);
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irq = ffz(~isr);
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if (irq == 2) {
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isr = inb(0xa0);
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irq = 8 + ffz(~isr);
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}
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if (irq < 0 || irq > 15)
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return -EINVAL;
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return I8259_IRQ_BASE + irq;
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}
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static struct irqaction i8259_slave_cascade = {
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.handler = &no_action,
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.name = "cascade",
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};
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void __init rockhopper_init_irq(void)
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{
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int i;
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if(!vr4133_rockhopper) {
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printk(KERN_ERR "Not a Rockhopper Board \n");
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return;
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}
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for (i = I8259_IRQ_BASE; i <= I8259_IRQ_LAST; i++)
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irq_desc[i].handler = &i8259_irq_type;
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setup_irq(I8259_SLAVE_IRQ, &i8259_slave_cascade);
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vr41xx_set_irq_trigger(CMBVR41XX_INTC_PIN, TRIGGER_LEVEL, SIGNAL_THROUGH);
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vr41xx_set_irq_level(CMBVR41XX_INTC_PIN, LEVEL_HIGH);
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vr41xx_cascade_irq(CMBVR41XX_INTC_IRQ, i8259_get_irq_number);
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}
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