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   1 /*
   2  * linux/arch/h8300/platform/h8300h/ints_h8300h.c
   3  * Interrupt handling CPU variants
   4  *
   5  * Yoshinori Sato <ysato@users.sourceforge.jp>
   6  *
   7  */
   8
   9 #include <linux/config.h>
  10 #include <linux/init.h>
  11 #include <linux/errno.h>
  12
  13 #include <asm/ptrace.h>
  14 #include <asm/traps.h>
  15 #include <asm/irq.h>
  16 #include <asm/io.h>
  17 #include <asm/gpio.h>
  18 #include <asm/regs306x.h>
  19
  20 /* saved vector list */
  21 const int __initdata h8300_saved_vectors[]={
  22 #if defined(CONFIG_GDB_DEBUG)
  23         TRAP3_VEC,
  24 #endif
  25         -1
  26 };
  27
  28 /* trap entry table */
  29 const unsigned long __initdata h8300_trap_table[NR_TRAPS]={
  30         0,0,0,0,0,0,0,0,
  31         (unsigned long)system_call,  /* TRAPA #0 */
  32         0,0,
  33         (unsigned long)trace_break,  /* TRAPA #3 */
  34 };
  35
  36 int h8300_enable_irq_pin(unsigned int irq)
  37 {
  38         int bitmask;
  39         if (irq < EXT_IRQ0 || irq > EXT_IRQ5)
  40                 return 0;
  41
  42         /* initialize IRQ pin */
  43         bitmask = 1 << (irq - EXT_IRQ0);
  44         switch(irq) {
  45         case EXT_IRQ0:
  46         case EXT_IRQ1:
  47         case EXT_IRQ2:
  48         case EXT_IRQ3:
  49                 if (H8300_GPIO_RESERVE(H8300_GPIO_P8, bitmask) == 0)
  50                         return -EBUSY;
  51                 H8300_GPIO_DDR(H8300_GPIO_P8, bitmask, H8300_GPIO_INPUT);
  52                 break;
  53         case EXT_IRQ4:
  54         case EXT_IRQ5:
  55                 if (H8300_GPIO_RESERVE(H8300_GPIO_P9, bitmask) == 0)
  56                         return -EBUSY;
  57                 H8300_GPIO_DDR(H8300_GPIO_P9, bitmask, H8300_GPIO_INPUT);
  58                 break;
  59         }
  60
  61         return 0;
  62 }
  63
  64 void h8300_disable_irq_pin(unsigned int irq)
  65 {
  66         int bitmask;
  67         if (irq < EXT_IRQ0 || irq > EXT_IRQ5)
  68                 return;
  69
  70         /* disable interrupt & release IRQ pin */
  71         bitmask = 1 << (irq - EXT_IRQ0);
  72         switch(irq) {
  73         case EXT_IRQ0:
  74         case EXT_IRQ1:
  75         case EXT_IRQ2:
  76         case EXT_IRQ3:
  77                 *(volatile unsigned char *)IER &= ~bitmask;
  78                 H8300_GPIO_FREE(H8300_GPIO_P8, bitmask);
  79                 break ;
  80         case EXT_IRQ4:
  81         case EXT_IRQ5:
  82                 *(volatile unsigned char *)IER &= ~bitmask;
  83                 H8300_GPIO_FREE(H8300_GPIO_P9, bitmask);
  84                 break;
  85         }
  86 }