release/src-rt-6.x/linux/linux-2.6/arch/arm/mach-s3c2412/irq.c

   1 /* linux/arch/arm/mach-s3c2412/irq.c
   2  *
   3  * Copyright (c) 2006 Simtec Electronics
   4  *      Ben Dooks <ben@simtec.co.uk>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20 */
  21
  22 #include <linux/init.h>
  23 #include <linux/module.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/ioport.h>
  26 #include <linux/sysdev.h>
  27
  28 #include <asm/hardware.h>
  29 #include <asm/irq.h>
  30 #include <asm/io.h>
  31
  32 #include <asm/mach/irq.h>
  33
  34 #include <asm/arch/regs-irq.h>
  35 #include <asm/arch/regs-gpio.h>
  36
  37 #include <asm/plat-s3c24xx/cpu.h>
  38 #include <asm/plat-s3c24xx/irq.h>
  39 #include <asm/plat-s3c24xx/pm.h>
  40
  41 /* the s3c2412 changes the behaviour of IRQ_EINT0 through IRQ_EINT3 by
  42  * having them turn up in both the INT* and the EINT* registers. Whilst
  43  * both show the status, they both now need to be acked when the IRQs
  44  * go off.
  45 */
  46
  47 static void
  48 s3c2412_irq_mask(unsigned int irqno)
  49 {
  50         unsigned long bitval = 1UL << (irqno - IRQ_EINT0);
  51         unsigned long mask;
  52
  53         mask = __raw_readl(S3C2410_INTMSK);
  54         __raw_writel(mask | bitval, S3C2410_INTMSK);
  55
  56         mask = __raw_readl(S3C2412_EINTMASK);
  57         __raw_writel(mask | bitval, S3C2412_EINTMASK);
  58 }
  59
  60 static inline void
  61 s3c2412_irq_ack(unsigned int irqno)
  62 {
  63         unsigned long bitval = 1UL << (irqno - IRQ_EINT0);
  64
  65         __raw_writel(bitval, S3C2412_EINTPEND);
  66         __raw_writel(bitval, S3C2410_SRCPND);
  67         __raw_writel(bitval, S3C2410_INTPND);
  68 }
  69
  70 static inline void
  71 s3c2412_irq_maskack(unsigned int irqno)
  72 {
  73         unsigned long bitval = 1UL << (irqno - IRQ_EINT0);
  74         unsigned long mask;
  75
  76         mask = __raw_readl(S3C2410_INTMSK);
  77         __raw_writel(mask|bitval, S3C2410_INTMSK);
  78
  79         mask = __raw_readl(S3C2412_EINTMASK);
  80         __raw_writel(mask | bitval, S3C2412_EINTMASK);
  81
  82         __raw_writel(bitval, S3C2412_EINTPEND);
  83         __raw_writel(bitval, S3C2410_SRCPND);
  84         __raw_writel(bitval, S3C2410_INTPND);
  85 }
  86
  87 static void
  88 s3c2412_irq_unmask(unsigned int irqno)
  89 {
  90         unsigned long bitval = 1UL << (irqno - IRQ_EINT0);
  91         unsigned long mask;
  92
  93         mask = __raw_readl(S3C2412_EINTMASK);
  94         __raw_writel(mask & ~bitval, S3C2412_EINTMASK);
  95
  96         mask = __raw_readl(S3C2410_INTMSK);
  97         __raw_writel(mask & ~bitval, S3C2410_INTMSK);
  98 }
  99
 100 static struct irq_chip s3c2412_irq_eint0t4 = {
 101         .ack       = s3c2412_irq_ack,
 102         .mask      = s3c2412_irq_mask,
 103         .unmask    = s3c2412_irq_unmask,
 104         .set_wake  = s3c_irq_wake,
 105         .set_type  = s3c_irqext_type,
 106 };
 107
 108 static int s3c2412_irq_add(struct sys_device *sysdev)
 109 {
 110         unsigned int irqno;
 111
 112         for (irqno = IRQ_EINT0; irqno <= IRQ_EINT3; irqno++) {
 113                 set_irq_chip(irqno, &s3c2412_irq_eint0t4);
 114                 set_irq_handler(irqno, handle_edge_irq);
 115                 set_irq_flags(irqno, IRQF_VALID);
 116         }
 117
 118         return 0;
 119 }
 120
 121 static struct sysdev_driver s3c2412_irq_driver = {
 122         .add            = s3c2412_irq_add,
 123         .suspend        = s3c24xx_irq_suspend,
 124         .resume         = s3c24xx_irq_resume,
 125 };
 126
 127 static int s3c2412_irq_init(void)
 128 {
 129         return sysdev_driver_register(&s3c2412_sysclass, &s3c2412_irq_driver);
 130 }
 131
 132 arch_initcall(s3c2412_irq_init);