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

   1 /*
   2  *
   3  *  Copyright (C) 1999 ARM Limited
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  */
  19 #include <linux/init.h>
  20 #include <linux/stddef.h>
  21 #include <linux/list.h>
  22 #include <linux/timer.h>
  23 #include <linux/version.h>
  24 #include <linux/io.h>
  25
  26 #include <mach/hardware.h>
  27 #include <asm/irq.h>
  28
  29 #include <asm/mach/irq.h>
  30 #include <mach/csp/intcHw_reg.h>
  31 #include <mach/csp/mm_io.h>
  32
  33 static void bcmring_mask_irq0(unsigned int irq)
  34 {
  35         writel(1 << (irq - IRQ_INTC0_START),
  36                MM_IO_BASE_INTC0 + INTCHW_INTENCLEAR);
  37 }
  38
  39 static void bcmring_unmask_irq0(unsigned int irq)
  40 {
  41         writel(1 << (irq - IRQ_INTC0_START),
  42                MM_IO_BASE_INTC0 + INTCHW_INTENABLE);
  43 }
  44
  45 static void bcmring_mask_irq1(unsigned int irq)
  46 {
  47         writel(1 << (irq - IRQ_INTC1_START),
  48                MM_IO_BASE_INTC1 + INTCHW_INTENCLEAR);
  49 }
  50
  51 static void bcmring_unmask_irq1(unsigned int irq)
  52 {
  53         writel(1 << (irq - IRQ_INTC1_START),
  54                MM_IO_BASE_INTC1 + INTCHW_INTENABLE);
  55 }
  56
  57 static void bcmring_mask_irq2(unsigned int irq)
  58 {
  59         writel(1 << (irq - IRQ_SINTC_START),
  60                MM_IO_BASE_SINTC + INTCHW_INTENCLEAR);
  61 }
  62
  63 static void bcmring_unmask_irq2(unsigned int irq)
  64 {
  65         writel(1 << (irq - IRQ_SINTC_START),
  66                MM_IO_BASE_SINTC + INTCHW_INTENABLE);
  67 }
  68
  69 static struct irq_chip bcmring_irq0_chip = {
  70         .typename = "ARM-INTC0",
  71         .ack = bcmring_mask_irq0,
  72         .mask = bcmring_mask_irq0,      /* mask a specific interrupt, blocking its delivery. */
  73         .unmask = bcmring_unmask_irq0,  /* unmaks an interrupt */
  74 };
  75
  76 static struct irq_chip bcmring_irq1_chip = {
  77         .typename = "ARM-INTC1",
  78         .ack = bcmring_mask_irq1,
  79         .mask = bcmring_mask_irq1,
  80         .unmask = bcmring_unmask_irq1,
  81 };
  82
  83 static struct irq_chip bcmring_irq2_chip = {
  84         .typename = "ARM-SINTC",
  85         .ack = bcmring_mask_irq2,
  86         .mask = bcmring_mask_irq2,
  87         .unmask = bcmring_unmask_irq2,
  88 };
  89
  90 static void vic_init(void __iomem *base, struct irq_chip *chip,
  91                      unsigned int irq_start, unsigned int vic_sources)
  92 {
  93         unsigned int i;
  94         for (i = 0; i < 32; i++) {
  95                 unsigned int irq = irq_start + i;
  96                 set_irq_chip(irq, chip);
  97                 set_irq_chip_data(irq, base);
  98
  99                 if (vic_sources & (1 << i)) {
 100                         set_irq_handler(irq, handle_level_irq);
 101                         set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
 102                 }
 103         }
 104         writel(0, base + INTCHW_INTSELECT);
 105         writel(0, base + INTCHW_INTENABLE);
 106         writel(~0, base + INTCHW_INTENCLEAR);
 107         writel(0, base + INTCHW_IRQSTATUS);
 108         writel(~0, base + INTCHW_SOFTINTCLEAR);
 109 }
 110
 111 void __init bcmring_init_irq(void)
 112 {
 113         vic_init((void __iomem *)MM_IO_BASE_INTC0, &bcmring_irq0_chip,
 114                  IRQ_INTC0_START, IRQ_INTC0_VALID_MASK);
 115         vic_init((void __iomem *)MM_IO_BASE_INTC1, &bcmring_irq1_chip,
 116                  IRQ_INTC1_START, IRQ_INTC1_VALID_MASK);
 117         vic_init((void __iomem *)MM_IO_BASE_SINTC, &bcmring_irq2_chip,
 118                  IRQ_SINTC_START, IRQ_SINTC_VALID_MASK);
 119
 120         /* special cases */
 121         if (INTCHW_INTC1_GPIO0 & IRQ_INTC1_VALID_MASK) {
 122                 set_irq_handler(IRQ_GPIO0, handle_simple_irq);
 123         }
 124         if (INTCHW_INTC1_GPIO1 & IRQ_INTC1_VALID_MASK) {
 125                 set_irq_handler(IRQ_GPIO1, handle_simple_irq);
 126         }
 127 }