112 lines
2.7 KiB
C
112 lines
2.7 KiB
C
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/*
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* linux/arch/sh/boards/systemh/irq.c
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*
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* Copyright (C) 2000 Kazumoto Kojima
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*
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* Hitachi SystemH Support.
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*
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* Modified for 7751 SystemH by
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* Jonathan Short.
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*/
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#include <linux/config.h>
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#include <linux/init.h>
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#include <linux/irq.h>
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#include <linux/hdreg.h>
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#include <linux/ide.h>
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#include <asm/io.h>
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#include <asm/mach/7751systemh.h>
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#include <asm/smc37c93x.h>
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/* address of external interrupt mask register
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* address must be set prior to use these (maybe in init_XXX_irq())
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* XXX : is it better to use .config than specifying it in code? */
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static unsigned long *systemh_irq_mask_register = (unsigned long *)0xB3F10004;
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static unsigned long *systemh_irq_request_register = (unsigned long *)0xB3F10000;
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/* forward declaration */
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static unsigned int startup_systemh_irq(unsigned int irq);
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static void shutdown_systemh_irq(unsigned int irq);
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static void enable_systemh_irq(unsigned int irq);
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static void disable_systemh_irq(unsigned int irq);
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static void mask_and_ack_systemh(unsigned int);
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static void end_systemh_irq(unsigned int irq);
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/* hw_interrupt_type */
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static struct hw_interrupt_type systemh_irq_type = {
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" SystemH Register",
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startup_systemh_irq,
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shutdown_systemh_irq,
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enable_systemh_irq,
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disable_systemh_irq,
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mask_and_ack_systemh,
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end_systemh_irq
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};
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static unsigned int startup_systemh_irq(unsigned int irq)
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{
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enable_systemh_irq(irq);
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return 0; /* never anything pending */
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}
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static void shutdown_systemh_irq(unsigned int irq)
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{
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disable_systemh_irq(irq);
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}
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static void disable_systemh_irq(unsigned int irq)
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{
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if (systemh_irq_mask_register) {
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unsigned long flags;
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unsigned long val, mask = 0x01 << 1;
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/* Clear the "irq"th bit in the mask and set it in the request */
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local_irq_save(flags);
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val = ctrl_inl((unsigned long)systemh_irq_mask_register);
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val &= ~mask;
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ctrl_outl(val, (unsigned long)systemh_irq_mask_register);
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val = ctrl_inl((unsigned long)systemh_irq_request_register);
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val |= mask;
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ctrl_outl(val, (unsigned long)systemh_irq_request_register);
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local_irq_restore(flags);
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}
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}
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static void enable_systemh_irq(unsigned int irq)
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{
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if (systemh_irq_mask_register) {
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unsigned long flags;
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unsigned long val, mask = 0x01 << 1;
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/* Set "irq"th bit in the mask register */
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local_irq_save(flags);
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val = ctrl_inl((unsigned long)systemh_irq_mask_register);
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val |= mask;
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ctrl_outl(val, (unsigned long)systemh_irq_mask_register);
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local_irq_restore(flags);
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}
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}
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static void mask_and_ack_systemh(unsigned int irq)
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{
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disable_systemh_irq(irq);
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}
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static void end_systemh_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_systemh_irq(irq);
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}
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void make_systemh_irq(unsigned int irq)
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{
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disable_irq_nosync(irq);
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irq_desc[irq].handler = &systemh_irq_type;
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disable_systemh_irq(irq);
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}
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