text: /*
   *  Interrupt routines for Gemini
   *
   *  Copyright (C) 2001-2006 Storlink, Corp.
   *  Copyright (C) 2008-2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 2 of the License, or
   * (at your option) any later version.
   */
  #include <linux/init.h>
  #include <linux/io.h>
  #include <linux/ioport.h>
  #include <linux/stddef.h>
  #include <linux/list.h>
  #include <linux/sched.h>
  #include <linux/cpu.h>
  
  #include <asm/irq.h>
  #include <asm/mach/irq.h>
  #include <asm/system_misc.h>
  #include <mach/hardware.h>
  
  #define IRQ_SOURCE(base_addr)	(base_addr + 0x00)
  #define IRQ_MASK(base_addr)	(base_addr + 0x04)
  #define IRQ_CLEAR(base_addr)	(base_addr + 0x08)
  #define IRQ_TMODE(base_addr)	(base_addr + 0x0C)
  #define IRQ_TLEVEL(base_addr)	(base_addr + 0x10)
  #define IRQ_STATUS(base_addr)	(base_addr + 0x14)
  #define FIQ_SOURCE(base_addr)	(base_addr + 0x20)
  #define FIQ_MASK(base_addr)	(base_addr + 0x24)
  #define FIQ_CLEAR(base_addr)	(base_addr + 0x28)
  #define FIQ_TMODE(base_addr)	(base_addr + 0x2C)
  #define FIQ_LEVEL(base_addr)	(base_addr + 0x30)
  #define FIQ_STATUS(base_addr)	(base_addr + 0x34)
  
  static void gemini_ack_irq(struct irq_data *d)
  {
  	__raw_writel(1 << d->irq, IRQ_CLEAR(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
  }
  
  static void gemini_mask_irq(struct irq_data *d)
  {
  	unsigned int mask;
  
  	mask = __raw_readl(IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
  	mask &= ~(1 << d->irq);
  	__raw_writel(mask, IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
  }
  
  static void gemini_unmask_irq(struct irq_data *d)
  {
  	unsigned int mask;
  
  	mask = __raw_readl(IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
  	mask |= (1 << d->irq);
  	__raw_writel(mask, IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
  }
  
  static struct irq_chip gemini_irq_chip = {
  	.name		= "INTC",
  	.irq_ack	= gemini_ack_irq,
  	.irq_mask	= gemini_mask_irq,
  	.irq_unmask	= gemini_unmask_irq,
  };
  
  static struct resource irq_resource = {
  	.name	= "irq_handler",
  	.start	= GEMINI_INTERRUPT_BASE,
  	.end	= FIQ_STATUS(GEMINI_INTERRUPT_BASE) + 4,
  };
  
  void __init gemini_init_irq(void)
  {
  	unsigned int i, mode = 0, level = 0;
  
  	/*
  	 * Disable the idle handler by default since it is buggy
  	 * For more info see arch/arm/mach-gemini/idle.c
  	 */
  	cpu_idle_poll_ctrl(true);
  
  	request_resource(&iomem_resource, &irq_resource);
  
  	for (i = 0; i < NR_IRQS; i++) {
  		irq_set_chip(i, &gemini_irq_chip);
  		if((i >= IRQ_TIMER1 && i <= IRQ_TIMER3) || (i >= IRQ_SERIRQ0 && i <= IRQ_SERIRQ1)) {
  			irq_set_handler(i, handle_edge_irq);
  			mode |= 1 << i;
  			level |= 1 << i;
  		} else {			
  			irq_set_handler(i, handle_level_irq);
  		}
  		set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
  	}
  
  	/* Disable all interrupts */
  	__raw_writel(0, IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
  	__raw_writel(0, FIQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
  
  	/* Set interrupt mode */
  	__raw_writel(mode, IRQ_TMODE(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
  	__raw_writel(level, IRQ_TLEVEL(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
  }
  