1/*
  2 *  Interrupt routines for Gemini
  3 *
  4 *  Copyright (C) 2001-2006 Storlink, Corp.
  5 *  Copyright (C) 2008-2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
  6 *
  7 * This program is free software; you can redistribute it and/or modify
  8 * it under the terms of the GNU General Public License as published by
  9 * the Free Software Foundation; either version 2 of the License, or
 10 * (at your option) any later version.
 11 */
 12#include <linux/init.h>
 13#include <linux/io.h>
 14#include <linux/ioport.h>
 15#include <linux/stddef.h>
 16#include <linux/list.h>
 17#include <linux/sched.h>
 18#include <asm/irq.h>
 19#include <asm/mach/irq.h>
 20#include <mach/hardware.h>
 21
 22#define IRQ_SOURCE(base_addr)	(base_addr + 0x00)
 23#define IRQ_MASK(base_addr)	(base_addr + 0x04)
 24#define IRQ_CLEAR(base_addr)	(base_addr + 0x08)
 25#define IRQ_TMODE(base_addr)	(base_addr + 0x0C)
 26#define IRQ_TLEVEL(base_addr)	(base_addr + 0x10)
 27#define IRQ_STATUS(base_addr)	(base_addr + 0x14)
 28#define FIQ_SOURCE(base_addr)	(base_addr + 0x20)
 29#define FIQ_MASK(base_addr)	(base_addr + 0x24)
 30#define FIQ_CLEAR(base_addr)	(base_addr + 0x28)
 31#define FIQ_TMODE(base_addr)	(base_addr + 0x2C)
 32#define FIQ_LEVEL(base_addr)	(base_addr + 0x30)
 33#define FIQ_STATUS(base_addr)	(base_addr + 0x34)
 34
 35static void gemini_ack_irq(struct irq_data *d)
 36{
 37	__raw_writel(1 << d->irq, IRQ_CLEAR(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
 38}
 39
 40static void gemini_mask_irq(struct irq_data *d)
 41{
 42	unsigned int mask;
 43
 44	mask = __raw_readl(IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
 45	mask &= ~(1 << d->irq);
 46	__raw_writel(mask, IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
 47}
 48
 49static void gemini_unmask_irq(struct irq_data *d)
 50{
 51	unsigned int mask;
 52
 53	mask = __raw_readl(IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
 54	mask |= (1 << d->irq);
 55	__raw_writel(mask, IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
 56}
 57
 58static struct irq_chip gemini_irq_chip = {
 59	.name		= "INTC",
 60	.irq_ack	= gemini_ack_irq,
 61	.irq_mask	= gemini_mask_irq,
 62	.irq_unmask	= gemini_unmask_irq,
 63};
 64
 65static struct resource irq_resource = {
 66	.name	= "irq_handler",
 67	.start	= IO_ADDRESS(GEMINI_INTERRUPT_BASE),
 68	.end	= IO_ADDRESS(FIQ_STATUS(GEMINI_INTERRUPT_BASE)) + 4,
 69};
 70
 71void __init gemini_init_irq(void)
 72{
 73	unsigned int i, mode = 0, level = 0;
 74
 75	/*
 76	 * Disable arch_idle() by default since it is buggy
 77	 * For more info see arch/arm/mach-gemini/include/mach/system.h
 78	 */
 79	disable_hlt();
 80
 81	request_resource(&iomem_resource, &irq_resource);
 82
 83	for (i = 0; i < NR_IRQS; i++) {
 84		irq_set_chip(i, &gemini_irq_chip);
 85		if((i >= IRQ_TIMER1 && i <= IRQ_TIMER3) || (i >= IRQ_SERIRQ0 && i <= IRQ_SERIRQ1)) {
 86			irq_set_handler(i, handle_edge_irq);
 87			mode |= 1 << i;
 88			level |= 1 << i;
 89		} else {			
 90			irq_set_handler(i, handle_level_irq);
 91		}
 92		set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
 93	}
 94
 95	/* Disable all interrupts */
 96	__raw_writel(0, IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
 97	__raw_writel(0, FIQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
 98
 99	/* Set interrupt mode */
100	__raw_writel(mode, IRQ_TMODE(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
101	__raw_writel(level, IRQ_TLEVEL(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
102}