arch/arm/mach-pnx4008/irq.c

   1 /*
   2  * arch/arm/mach-pnx4008/irq.c
   3  *
   4  * PNX4008 IRQ controller driver
   5  *
   6  * Author: Dmitry Chigirev <source@mvista.com>
   7  *
   8  * Based on reference code received from Philips:
   9  * Copyright (C) 2003 Philips Semiconductors
  10  *
  11  * 2005 (c) MontaVista Software, Inc. This file is licensed under
  12  * the terms of the GNU General Public License version 2. This program
  13  * is licensed "as is" without any warranty of any kind, whether express
  14  * or implied.
  15  */
  16
  17 #include <linux/kernel.h>
  18 #include <linux/types.h>
  19 #include <linux/mm.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/list.h>
  22 #include <linux/init.h>
  23 #include <linux/ioport.h>
  24 #include <linux/device.h>
  25 #include <linux/irq.h>
  26 #include <mach/hardware.h>
  27 #include <asm/io.h>
  28 #include <asm/setup.h>
  29 #include <asm/pgtable.h>
  30 #include <asm/page.h>
  31 #include <asm/system.h>
  32 #include <asm/mach/arch.h>
  33 #include <asm/mach/irq.h>
  34 #include <asm/mach/map.h>
  35 #include <mach/irq.h>
  36
  37 static u8 pnx4008_irq_type[NR_IRQS] = PNX4008_IRQ_TYPES;
  38
  39 static void pnx4008_mask_irq(unsigned int irq)
  40 {
  41         __raw_writel(__raw_readl(INTC_ER(irq)) & ~INTC_BIT(irq), INTC_ER(irq)); /* mask interrupt */
  42 }
  43
  44 static void pnx4008_unmask_irq(unsigned int irq)
  45 {
  46         __raw_writel(__raw_readl(INTC_ER(irq)) | INTC_BIT(irq), INTC_ER(irq));  /* unmask interrupt */
  47 }
  48
  49 static void pnx4008_mask_ack_irq(unsigned int irq)
  50 {
  51         __raw_writel(__raw_readl(INTC_ER(irq)) & ~INTC_BIT(irq), INTC_ER(irq)); /* mask interrupt */
  52         __raw_writel(INTC_BIT(irq), INTC_SR(irq));      /* clear interrupt status */
  53 }
  54
  55 static int pnx4008_set_irq_type(unsigned int irq, unsigned int type)
  56 {
  57         switch (type) {
  58         case IRQ_TYPE_EDGE_RISING:
  59                 __raw_writel(__raw_readl(INTC_ATR(irq)) | INTC_BIT(irq), INTC_ATR(irq));        /*edge sensitive */
  60                 __raw_writel(__raw_readl(INTC_APR(irq)) | INTC_BIT(irq), INTC_APR(irq));        /*rising edge */
  61                 set_irq_handler(irq, handle_edge_irq);
  62                 break;
  63         case IRQ_TYPE_EDGE_FALLING:
  64                 __raw_writel(__raw_readl(INTC_ATR(irq)) | INTC_BIT(irq), INTC_ATR(irq));        /*edge sensitive */
  65                 __raw_writel(__raw_readl(INTC_APR(irq)) & ~INTC_BIT(irq), INTC_APR(irq));       /*falling edge */
  66                 set_irq_handler(irq, handle_edge_irq);
  67                 break;
  68         case IRQ_TYPE_LEVEL_LOW:
  69                 __raw_writel(__raw_readl(INTC_ATR(irq)) & ~INTC_BIT(irq), INTC_ATR(irq));       /*level sensitive */
  70                 __raw_writel(__raw_readl(INTC_APR(irq)) & ~INTC_BIT(irq), INTC_APR(irq));       /*low level */
  71                 set_irq_handler(irq, handle_level_irq);
  72                 break;
  73         case IRQ_TYPE_LEVEL_HIGH:
  74                 __raw_writel(__raw_readl(INTC_ATR(irq)) & ~INTC_BIT(irq), INTC_ATR(irq));       /*level sensitive */
  75                 __raw_writel(__raw_readl(INTC_APR(irq)) | INTC_BIT(irq), INTC_APR(irq));        /* high level */
  76                 set_irq_handler(irq, handle_level_irq);
  77                 break;
  78
  79         /* IRQ_TYPE_EDGE_BOTH is not supported */
  80         default:
  81                 printk(KERN_ERR "PNX4008 IRQ: Unsupported irq type %d\n", type);
  82                 return -1;
  83         }
  84         return 0;
  85 }
  86
  87 static struct irq_chip pnx4008_irq_chip = {
  88         .ack = pnx4008_mask_ack_irq,
  89         .mask = pnx4008_mask_irq,
  90         .unmask = pnx4008_unmask_irq,
  91         .set_type = pnx4008_set_irq_type,
  92 };
  93
  94 void __init pnx4008_init_irq(void)
  95 {
  96         unsigned int i;
  97
  98         /* configure IRQ's */
  99         for (i = 0; i < NR_IRQS; i++) {
 100                 set_irq_flags(i, IRQF_VALID);
 101                 set_irq_chip(i, &pnx4008_irq_chip);
 102                 pnx4008_set_irq_type(i, pnx4008_irq_type[i]);
 103         }
 104
 105         /* configure and enable IRQ 0,1,30,31 (cascade interrupts) */
 106         pnx4008_set_irq_type(SUB1_IRQ_N, pnx4008_irq_type[SUB1_IRQ_N]);
 107         pnx4008_set_irq_type(SUB2_IRQ_N, pnx4008_irq_type[SUB2_IRQ_N]);
 108         pnx4008_set_irq_type(SUB1_FIQ_N, pnx4008_irq_type[SUB1_FIQ_N]);
 109         pnx4008_set_irq_type(SUB2_FIQ_N, pnx4008_irq_type[SUB2_FIQ_N]);
 110
 111         /* mask all others */
 112         __raw_writel((1 << SUB2_FIQ_N) | (1 << SUB1_FIQ_N) |
 113                         (1 << SUB2_IRQ_N) | (1 << SUB1_IRQ_N),
 114                 INTC_ER(MAIN_BASE_INT));
 115         __raw_writel(0, INTC_ER(SIC1_BASE_INT));
 116         __raw_writel(0, INTC_ER(SIC2_BASE_INT));
 117 }
 118