release/src-rt-6.x.4708/linux/linux-2.6.36/arch/arm/mach-gemini/irq.c

   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
  35 static void gemini_ack_irq(unsigned int irq)
  36 {
  37         __raw_writel(1 << irq, IRQ_CLEAR(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
  38 }
  39
  40 static void gemini_mask_irq(unsigned int irq)
  41 {
  42         unsigned int mask;
  43
  44         mask = __raw_readl(IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
  45         mask &= ~(1 << irq);
  46         __raw_writel(mask, IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
  47 }
  48
  49 static void gemini_unmask_irq(unsigned int irq)
  50 {
  51         unsigned int mask;
  52
  53         mask = __raw_readl(IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
  54         mask |= (1 << irq);
  55         __raw_writel(mask, IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
  56 }
  57
  58 static struct irq_chip gemini_irq_chip = {
  59         .name   = "INTC",
  60         .ack    = gemini_ack_irq,
  61         .mask   = gemini_mask_irq,
  62         .unmask = gemini_unmask_irq,
  63 };
  64
  65 static 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
  71 void __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                 set_irq_chip(i, &gemini_irq_chip);
  85                 if((i >= IRQ_TIMER1 && i <= IRQ_TIMER3) || (i >= IRQ_SERIRQ0 && i <= IRQ_SERIRQ1)) {
  86                         set_irq_handler(i, handle_edge_irq);
  87                         mode |= 1 << i;
  88                         level |= 1 << i;
  89                 } else {
  90                         set_irq_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 }