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131 lines
2.7 KiB
131 lines
2.7 KiB
20 years ago
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/*
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* arch/ppc/platforms/adir_pic.c
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*
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* Interrupt controller support for SBS Adirondack
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*
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* By Michael Sokolov <msokolov@ivan.Harhan.ORG>
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* based on the K2 and SCM versions by Matt Porter <mporter@mvista.com>
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*/
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#include <linux/stddef.h>
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/pci.h>
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#include <linux/interrupt.h>
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#include <asm/io.h>
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#include <asm/i8259.h>
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#include "adir.h"
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static void adir_onboard_pic_enable(unsigned int irq);
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static void adir_onboard_pic_disable(unsigned int irq);
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__init static void
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adir_onboard_pic_init(void)
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{
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volatile u_short *maskreg = (volatile u_short *) ADIR_PROCA_INT_MASK;
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/* Disable all Adirondack onboard interrupts */
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out_be16(maskreg, 0xFFFF);
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}
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static int
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adir_onboard_pic_get_irq(void)
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{
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volatile u_short *statreg = (volatile u_short *) ADIR_PROCA_INT_STAT;
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int irq;
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u_short int_status, int_test;
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int_status = in_be16(statreg);
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for (irq = 0, int_test = 1; irq < 16; irq++, int_test <<= 1) {
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if (int_status & int_test)
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break;
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}
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if (irq == 16)
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return -1;
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return (irq+16);
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}
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static void
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adir_onboard_pic_enable(unsigned int irq)
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{
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volatile u_short *maskreg = (volatile u_short *) ADIR_PROCA_INT_MASK;
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/* Change irq to Adirondack onboard native value */
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irq -= 16;
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/* Enable requested irq number */
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out_be16(maskreg, in_be16(maskreg) & ~(1 << irq));
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}
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static void
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adir_onboard_pic_disable(unsigned int irq)
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{
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volatile u_short *maskreg = (volatile u_short *) ADIR_PROCA_INT_MASK;
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/* Change irq to Adirondack onboard native value */
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irq -= 16;
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/* Disable requested irq number */
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out_be16(maskreg, in_be16(maskreg) | (1 << irq));
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}
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static struct hw_interrupt_type adir_onboard_pic = {
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" ADIR PIC ",
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NULL,
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NULL,
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adir_onboard_pic_enable, /* unmask */
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adir_onboard_pic_disable, /* mask */
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adir_onboard_pic_disable, /* mask and ack */
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NULL,
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NULL
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};
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static struct irqaction noop_action = {
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.handler = no_action,
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.flags = SA_INTERRUPT,
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.mask = CPU_MASK_NONE,
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.name = "82c59 primary cascade",
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};
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/*
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* Linux interrupt values are assigned as follows:
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*
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* 0-15 VT82C686 8259 interrupts
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* 16-31 Adirondack CPLD interrupts
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*/
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__init void
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adir_init_IRQ(void)
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{
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int i;
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/* Initialize the cascaded 8259's on the VT82C686 */
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for (i=0; i<16; i++)
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irq_desc[i].handler = &i8259_pic;
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i8259_init(NULL);
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/* Initialize Adirondack CPLD PIC and enable 8259 interrupt cascade */
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for (i=16; i<32; i++)
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irq_desc[i].handler = &adir_onboard_pic;
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adir_onboard_pic_init();
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/* Enable 8259 interrupt cascade */
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setup_irq(ADIR_IRQ_VT82C686_INTR, &noop_action);
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}
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int
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adir_get_irq(struct pt_regs *regs)
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{
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int irq;
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if ((irq = adir_onboard_pic_get_irq()) < 0)
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return irq;
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if (irq == ADIR_IRQ_VT82C686_INTR)
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irq = i8259_irq(regs);
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return irq;
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}
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