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