arch/arm/mach-ks8695/irq.c

   1 /*
   2  * arch/arm/mach-ks8695/irq.c
   3  *
   4  * Copyright (C) 2006 Ben Dooks <ben@simtec.co.uk>
   5  * Copyright (C) 2006 Simtec Electronics
   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  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  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 static void ks8695_irq_mask(unsigned int irqno)
  38 {
  39         unsigned long inten;
  40
  41         inten = __raw_readl(KS8695_IRQ_VA + KS8695_INTEN);
  42         inten &= ~(1 << irqno);
  43
  44         __raw_writel(inten, KS8695_IRQ_VA + KS8695_INTEN);
  45 }
  46
  47 static void ks8695_irq_unmask(unsigned int irqno)
  48 {
  49         unsigned long inten;
  50
  51         inten = __raw_readl(KS8695_IRQ_VA + KS8695_INTEN);
  52         inten |= (1 << irqno);
  53
  54         __raw_writel(inten, KS8695_IRQ_VA + KS8695_INTEN);
  55 }
  56
  57 static void ks8695_irq_ack(unsigned int irqno)
  58 {
  59         __raw_writel((1 << irqno), KS8695_IRQ_VA + KS8695_INTST);
  60 }
  61
  62
  63 static struct irq_chip ks8695_irq_level_chip;
  64 static struct irq_chip ks8695_irq_edge_chip;
  65
  66
  67 static int ks8695_irq_set_type(unsigned int irqno, unsigned int type)
  68 {
  69         unsigned long ctrl, mode;
  70         unsigned short level_triggered = 0;
  71
  72         ctrl = __raw_readl(KS8695_GPIO_VA + KS8695_IOPC);
  73
  74         switch (type) {
  75                 case IRQT_HIGH:
  76                         mode = IOPC_TM_HIGH;
  77                         level_triggered = 1;
  78                         break;
  79                 case IRQT_LOW:
  80                         mode = IOPC_TM_LOW;
  81                         level_triggered = 1;
  82                         break;
  83                 case IRQT_RISING:
  84                         mode = IOPC_TM_RISING;
  85                         break;
  86                 case IRQT_FALLING:
  87                         mode = IOPC_TM_FALLING;
  88                         break;
  89                 case IRQT_BOTHEDGE:
  90                         mode = IOPC_TM_EDGE;
  91                         break;
  92                 default:
  93                         return -EINVAL;
  94         }
  95
  96         switch (irqno) {
  97                 case KS8695_IRQ_EXTERN0:
  98                         ctrl &= ~IOPC_IOEINT0TM;
  99                         ctrl |= IOPC_IOEINT0_MODE(mode);
 100                         break;
 101                 case KS8695_IRQ_EXTERN1:
 102                         ctrl &= ~IOPC_IOEINT1TM;
 103                         ctrl |= IOPC_IOEINT1_MODE(mode);
 104                         break;
 105                 case KS8695_IRQ_EXTERN2:
 106                         ctrl &= ~IOPC_IOEINT2TM;
 107                         ctrl |= IOPC_IOEINT2_MODE(mode);
 108                         break;
 109                 case KS8695_IRQ_EXTERN3:
 110                         ctrl &= ~IOPC_IOEINT3TM;
 111                         ctrl |= IOPC_IOEINT3_MODE(mode);
 112                         break;
 113                 default:
 114                         return -EINVAL;
 115         }
 116
 117         if (level_triggered) {
 118                 set_irq_chip(irqno, &ks8695_irq_level_chip);
 119                 set_irq_handler(irqno, handle_level_irq);
 120         }
 121         else {
 122                 set_irq_chip(irqno, &ks8695_irq_edge_chip);
 123                 set_irq_handler(irqno, handle_edge_irq);
 124         }
 125
 126         __raw_writel(ctrl, KS8695_GPIO_VA + KS8695_IOPC);
 127         return 0;
 128 }
 129
 130 static struct irq_chip ks8695_irq_level_chip = {
 131         .ack            = ks8695_irq_mask,
 132         .mask           = ks8695_irq_mask,
 133         .unmask         = ks8695_irq_unmask,
 134         .set_type       = ks8695_irq_set_type,
 135 };
 136
 137 static struct irq_chip ks8695_irq_edge_chip = {
 138         .ack            = ks8695_irq_ack,
 139         .mask           = ks8695_irq_mask,
 140         .unmask         = ks8695_irq_unmask,
 141         .set_type       = ks8695_irq_set_type,
 142 };
 143
 144 void __init ks8695_init_irq(void)
 145 {
 146         unsigned int irq;
 147
 148         /* Disable all interrupts initially */
 149         __raw_writel(0, KS8695_IRQ_VA + KS8695_INTMC);
 150         __raw_writel(0, KS8695_IRQ_VA + KS8695_INTEN);
 151
 152         for (irq = 0; irq < NR_IRQS; irq++) {
 153                 switch (irq) {
 154                         /* Level-triggered interrupts */
 155                         case KS8695_IRQ_BUS_ERROR:
 156                         case KS8695_IRQ_UART_MODEM_STATUS:
 157                         case KS8695_IRQ_UART_LINE_STATUS:
 158                         case KS8695_IRQ_UART_RX:
 159                         case KS8695_IRQ_COMM_TX:
 160                         case KS8695_IRQ_COMM_RX:
 161                                 set_irq_chip(irq, &ks8695_irq_level_chip);
 162                                 set_irq_handler(irq, handle_level_irq);
 163                                 break;
 164
 165                         /* Edge-triggered interrupts */
 166                         default:
 167                                 ks8695_irq_ack(irq);    /* clear pending bit */
 168                                 set_irq_chip(irq, &ks8695_irq_edge_chip);
 169                                 set_irq_handler(irq, handle_edge_irq);
 170                 }
 171
 172                 set_irq_flags(irq, IRQF_VALID);
 173         }
 174 }