arch/h8300/platform/h8s/irq.c

   1 /*
   2  * linux/arch/h8300/platform/h8s/ints_h8s.c
   3  * Interrupt handling CPU variants
   4  *
   5  * Yoshinori Sato <ysato@users.sourceforge.jp>
   6  *
   7  */
   8
   9 #include <linux/init.h>
  10 #include <linux/errno.h>
  11 #include <linux/kernel.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/regs267x.h>
  19
  20 /* saved vector list */
  21 const int __initdata h8300_saved_vectors[]={
  22 #if defined(CONFIG_GDB_DEBUG)
  23         TRACE_VEC,
  24         TRAP3_VEC,
  25 #endif
  26         -1
  27 };
  28
  29 /* trap entry table */
  30 const H8300_VECTOR __initdata h8300_trap_table[] = {
  31         0,0,0,0,0,
  32         trace_break,  /* TRACE */
  33         0,0,
  34         system_call,  /* TRAPA #0 */
  35         0,0,0,0,0,0,0
  36 };
  37
  38 /* IRQ pin assignment */
  39 struct irq_pins {
  40         unsigned char port_no;
  41         unsigned char bit_no;
  42 } __attribute__((aligned(1),packed));
  43 /* ISTR = 0 */
  44 static const struct irq_pins irq_assign_table0[16]={
  45         {H8300_GPIO_P5,H8300_GPIO_B0},{H8300_GPIO_P5,H8300_GPIO_B1},
  46         {H8300_GPIO_P5,H8300_GPIO_B2},{H8300_GPIO_P5,H8300_GPIO_B3},
  47         {H8300_GPIO_P5,H8300_GPIO_B4},{H8300_GPIO_P5,H8300_GPIO_B5},
  48         {H8300_GPIO_P5,H8300_GPIO_B6},{H8300_GPIO_P5,H8300_GPIO_B7},
  49         {H8300_GPIO_P6,H8300_GPIO_B0},{H8300_GPIO_P6,H8300_GPIO_B1},
  50         {H8300_GPIO_P6,H8300_GPIO_B2},{H8300_GPIO_P6,H8300_GPIO_B3},
  51         {H8300_GPIO_P6,H8300_GPIO_B4},{H8300_GPIO_P6,H8300_GPIO_B5},
  52         {H8300_GPIO_PF,H8300_GPIO_B1},{H8300_GPIO_PF,H8300_GPIO_B2},
  53 };
  54 /* ISTR = 1 */
  55 static const struct irq_pins irq_assign_table1[16]={
  56         {H8300_GPIO_P8,H8300_GPIO_B0},{H8300_GPIO_P8,H8300_GPIO_B1},
  57         {H8300_GPIO_P8,H8300_GPIO_B2},{H8300_GPIO_P8,H8300_GPIO_B3},
  58         {H8300_GPIO_P8,H8300_GPIO_B4},{H8300_GPIO_P8,H8300_GPIO_B5},
  59         {H8300_GPIO_PH,H8300_GPIO_B2},{H8300_GPIO_PH,H8300_GPIO_B3},
  60         {H8300_GPIO_P2,H8300_GPIO_B0},{H8300_GPIO_P2,H8300_GPIO_B1},
  61         {H8300_GPIO_P2,H8300_GPIO_B2},{H8300_GPIO_P2,H8300_GPIO_B3},
  62         {H8300_GPIO_P2,H8300_GPIO_B4},{H8300_GPIO_P2,H8300_GPIO_B5},
  63         {H8300_GPIO_P2,H8300_GPIO_B6},{H8300_GPIO_P2,H8300_GPIO_B7},
  64 };
  65
  66 /* IRQ to GPIO pin translation */
  67 #define IRQ_GPIO_MAP(irqbit,irq,port,bit)                         \
  68 do {                                                              \
  69         if (*(volatile unsigned short *)ITSR & irqbit) {          \
  70                 port = irq_assign_table1[irq - EXT_IRQ0].port_no; \
  71                 bit  = irq_assign_table1[irq - EXT_IRQ0].bit_no;  \
  72         } else {                                                  \
  73                 port = irq_assign_table0[irq - EXT_IRQ0].port_no; \
  74                 bit  = irq_assign_table0[irq - EXT_IRQ0].bit_no;  \
  75         }                                                         \
  76 } while(0)
  77
  78 int h8300_enable_irq_pin(unsigned int irq)
  79 {
  80         if (irq >= EXT_IRQ0 && irq <= EXT_IRQ15) {
  81                 unsigned short ptn = 1 << (irq - EXT_IRQ0);
  82                 unsigned int port_no,bit_no;
  83                 IRQ_GPIO_MAP(ptn, irq, port_no, bit_no);
  84                 if (H8300_GPIO_RESERVE(port_no, bit_no) == 0)
  85                         return -EBUSY;                   /* pin already use */
  86                 H8300_GPIO_DDR(port_no, bit_no, H8300_GPIO_INPUT);
  87                 *(volatile unsigned short *)ISR &= ~ptn; /* ISR clear */
  88         }
  89
  90         return 0;
  91 }
  92
  93 void h8300_disable_irq_pin(unsigned int irq)
  94 {
  95         if (irq >= EXT_IRQ0 && irq <= EXT_IRQ15) {
  96                 /* disable interrupt & release IRQ pin */
  97                 unsigned short ptn = 1 << (irq - EXT_IRQ0);
  98                 unsigned short port_no,bit_no;
  99                 *(volatile unsigned short *)ISR &= ~ptn;
 100                 *(volatile unsigned short *)IER &= ~ptn;
 101                 IRQ_GPIO_MAP(ptn, irq, port_no, bit_no);
 102                 H8300_GPIO_FREE(port_no, bit_no);
 103         }
 104 }