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 <linux/cpu.h>
 19
 20#include <asm/irq.h>
 21#include <asm/mach/irq.h>
 22#include <asm/system_misc.h>
 23#include <mach/hardware.h>
 24
 25#define IRQ_SOURCE(base_addr)	(base_addr + 0x00)
 26#define IRQ_MASK(base_addr)	(base_addr + 0x04)
 27#define IRQ_CLEAR(base_addr)	(base_addr + 0x08)
 28#define IRQ_TMODE(base_addr)	(base_addr + 0x0C)
 29#define IRQ_TLEVEL(base_addr)	(base_addr + 0x10)
 30#define IRQ_STATUS(base_addr)	(base_addr + 0x14)
 31#define FIQ_SOURCE(base_addr)	(base_addr + 0x20)
 32#define FIQ_MASK(base_addr)	(base_addr + 0x24)
 33#define FIQ_CLEAR(base_addr)	(base_addr + 0x28)
 34#define FIQ_TMODE(base_addr)	(base_addr + 0x2C)
 35#define FIQ_LEVEL(base_addr)	(base_addr + 0x30)
 36#define FIQ_STATUS(base_addr)	(base_addr + 0x34)
 37
 38static void gemini_ack_irq(struct irq_data *d)
 39{
 40	__raw_writel(1 << d->irq, IRQ_CLEAR(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
 41}
 42
 43static void gemini_mask_irq(struct irq_data *d)
 44{
 45	unsigned int mask;
 46
 47	mask = __raw_readl(IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
 48	mask &= ~(1 << d->irq);
 49	__raw_writel(mask, IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
 50}
 51
 52static void gemini_unmask_irq(struct irq_data *d)
 53{
 54	unsigned int mask;
 55
 56	mask = __raw_readl(IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
 57	mask |= (1 << d->irq);
 58	__raw_writel(mask, IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
 59}
 60
 61static struct irq_chip gemini_irq_chip = {
 62	.name		= "INTC",
 63	.irq_ack	= gemini_ack_irq,
 64	.irq_mask	= gemini_mask_irq,
 65	.irq_unmask	= gemini_unmask_irq,
 66};
 67
 68static struct resource irq_resource = {
 69	.name	= "irq_handler",
 70	.start	= GEMINI_INTERRUPT_BASE,
 71	.end	= FIQ_STATUS(GEMINI_INTERRUPT_BASE) + 4,
 72};
 73
 74void __init gemini_init_irq(void)
 75{
 76	unsigned int i, mode = 0, level = 0;
 77
 78	/*
 79	 * Disable the idle handler by default since it is buggy
 80	 * For more info see arch/arm/mach-gemini/idle.c
 81	 */
 82	cpu_idle_poll_ctrl(true);
 83
 84	request_resource(&iomem_resource, &irq_resource);
 85
 86	for (i = 0; i < NR_IRQS; i++) {
 87		irq_set_chip(i, &gemini_irq_chip);
 88		if((i >= IRQ_TIMER1 && i <= IRQ_TIMER3) || (i >= IRQ_SERIRQ0 && i <= IRQ_SERIRQ1)) {
 89			irq_set_handler(i, handle_edge_irq);
 90			mode |= 1 << i;
 91			level |= 1 << i;
 92		} else {			
 93			irq_set_handler(i, handle_level_irq);
 94		}
 95		irq_clear_status_flags(i, IRQ_NOREQUEST | IRQ_NOPROBE);
 96	}
 97
 98	/* Disable all interrupts */
 99	__raw_writel(0, IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
100	__raw_writel(0, FIQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
101
102	/* Set interrupt mode */
103	__raw_writel(mode, IRQ_TMODE(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
104	__raw_writel(level, IRQ_TLEVEL(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
105}