arch/arm/plat-samsung/include/plat/irq.h

   1 /* linux/arch/arm/plat-samsung/include/plat/irq.h
   2  *
   3  * Copyright (c) 2004-2005 Simtec Electronics
   4  *      Ben Dooks <ben@simtec.co.uk>
   5  *
   6  * Header file for S3C24XX CPU IRQ support
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11 */
  12
  13 #include <linux/io.h>
  14
  15 #include <mach/hardware.h>
  16 #include <mach/regs-irq.h>
  17 #include <mach/regs-gpio.h>
  18
  19 #define irqdbf(x...)
  20 #define irqdbf2(x...)
  21
  22 #define EXTINT_OFF (IRQ_EINT4 - 4)
  23
  24 /* these are exported for arch/arm/mach-* usage */
  25 extern struct irq_chip s3c_irq_level_chip;
  26 extern struct irq_chip s3c_irq_chip;
  27
  28 static inline void s3c_irqsub_mask(unsigned int irqno,
  29                                    unsigned int parentbit,
  30                                    int subcheck)
  31 {
  32         unsigned long mask;
  33         unsigned long submask;
  34
  35         submask = __raw_readl(S3C2410_INTSUBMSK);
  36         mask = __raw_readl(S3C2410_INTMSK);
  37
  38         submask |= (1UL << (irqno - IRQ_S3CUART_RX0));
  39
  40         /* check to see if we need to mask the parent IRQ */
  41
  42         if ((submask  & subcheck) == subcheck)
  43                 __raw_writel(mask | parentbit, S3C2410_INTMSK);
  44
  45         /* write back masks */
  46         __raw_writel(submask, S3C2410_INTSUBMSK);
  47
  48 }
  49
  50 static inline void s3c_irqsub_unmask(unsigned int irqno,
  51                                      unsigned int parentbit)
  52 {
  53         unsigned long mask;
  54         unsigned long submask;
  55
  56         submask = __raw_readl(S3C2410_INTSUBMSK);
  57         mask = __raw_readl(S3C2410_INTMSK);
  58
  59         submask &= ~(1UL << (irqno - IRQ_S3CUART_RX0));
  60         mask &= ~parentbit;
  61
  62         /* write back masks */
  63         __raw_writel(submask, S3C2410_INTSUBMSK);
  64         __raw_writel(mask, S3C2410_INTMSK);
  65 }
  66
  67
  68 static inline void s3c_irqsub_maskack(unsigned int irqno,
  69                                       unsigned int parentmask,
  70                                       unsigned int group)
  71 {
  72         unsigned int bit = 1UL << (irqno - IRQ_S3CUART_RX0);
  73
  74         s3c_irqsub_mask(irqno, parentmask, group);
  75
  76         __raw_writel(bit, S3C2410_SUBSRCPND);
  77
  78         /* only ack parent if we've got all the irqs (seems we must
  79          * ack, all and hope that the irq system retriggers ok when
  80          * the interrupt goes off again)
  81          */
  82
  83         if (1) {
  84                 __raw_writel(parentmask, S3C2410_SRCPND);
  85                 __raw_writel(parentmask, S3C2410_INTPND);
  86         }
  87 }
  88
  89 static inline void s3c_irqsub_ack(unsigned int irqno,
  90                                   unsigned int parentmask,
  91                                   unsigned int group)
  92 {
  93         unsigned int bit = 1UL << (irqno - IRQ_S3CUART_RX0);
  94
  95         __raw_writel(bit, S3C2410_SUBSRCPND);
  96
  97         /* only ack parent if we've got all the irqs (seems we must
  98          * ack, all and hope that the irq system retriggers ok when
  99          * the interrupt goes off again)
 100          */
 101
 102         if (1) {
 103                 __raw_writel(parentmask, S3C2410_SRCPND);
 104                 __raw_writel(parentmask, S3C2410_INTPND);
 105         }
 106 }
 107
 108 /* exported for use in arch/arm/mach-s3c2410 */
 109
 110 #ifdef CONFIG_PM
 111 extern int s3c_irq_wake(struct irq_data *data, unsigned int state);
 112 #else
 113 #define s3c_irq_wake NULL
 114 #endif
 115
 116 extern int s3c_irqext_type(struct irq_data *d, unsigned int type);