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