arch/h8300/platform/h8s/ints_h8s.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/config.h>
  10 #include <linux/init.h>
  11 #include <linux/errno.h>
  12 #include <linux/kernel.h>
  13
  14 #include <asm/ptrace.h>
  15 #include <asm/traps.h>
  16 #include <asm/irq.h>
  17 #include <asm/io.h>
  18 #include <asm/gpio.h>
  19 #include <asm/regs267x.h>
  20
  21 /* saved vector list */
  22 const int __initdata h8300_saved_vectors[]={
  23 #if defined(CONFIG_GDB_DEBUG)
  24         TRACE_VEC,
  25         TRAP3_VEC,
  26 #endif
  27         -1
  28 };
  29
  30 /* trap entry table */
  31 const unsigned long __initdata h8300_trap_table[NR_TRAPS]={
  32         0,0,0,0,0,
  33         (unsigned long)trace_break,  /* TRACE */
  34         0,0,
  35         (unsigned long)system_call,  /* TRAPA #0 */
  36         0,0,0,0,0,0,0
  37 };
  38
  39 /* IRQ pin assignment */
  40 struct irq_pins {
  41         unsigned char port_no;
  42         unsigned char bit_no;
  43 } __attribute__((aligned(1),packed));
  44 /* ISTR = 0 */
  45 const static struct irq_pins irq_assign_table0[16]={
  46         {H8300_GPIO_P5,H8300_GPIO_B0},{H8300_GPIO_P5,H8300_GPIO_B1},
  47         {H8300_GPIO_P5,H8300_GPIO_B2},{H8300_GPIO_P5,H8300_GPIO_B3},
  48         {H8300_GPIO_P5,H8300_GPIO_B4},{H8300_GPIO_P5,H8300_GPIO_B5},
  49         {H8300_GPIO_P5,H8300_GPIO_B6},{H8300_GPIO_P5,H8300_GPIO_B7},
  50         {H8300_GPIO_P6,H8300_GPIO_B0},{H8300_GPIO_P6,H8300_GPIO_B1},
  51         {H8300_GPIO_P6,H8300_GPIO_B2},{H8300_GPIO_P6,H8300_GPIO_B3},
  52         {H8300_GPIO_P6,H8300_GPIO_B4},{H8300_GPIO_P6,H8300_GPIO_B5},
  53         {H8300_GPIO_PF,H8300_GPIO_B1},{H8300_GPIO_PF,H8300_GPIO_B2},
  54 };
  55 /* ISTR = 1 */
  56 const static struct irq_pins irq_assign_table1[16]={
  57         {H8300_GPIO_P8,H8300_GPIO_B0},{H8300_GPIO_P8,H8300_GPIO_B1},
  58         {H8300_GPIO_P8,H8300_GPIO_B2},{H8300_GPIO_P8,H8300_GPIO_B3},
  59         {H8300_GPIO_P8,H8300_GPIO_B4},{H8300_GPIO_P8,H8300_GPIO_B5},
  60         {H8300_GPIO_PH,H8300_GPIO_B2},{H8300_GPIO_PH,H8300_GPIO_B3},
  61         {H8300_GPIO_P2,H8300_GPIO_B0},{H8300_GPIO_P2,H8300_GPIO_B1},
  62         {H8300_GPIO_P2,H8300_GPIO_B2},{H8300_GPIO_P2,H8300_GPIO_B3},
  63         {H8300_GPIO_P2,H8300_GPIO_B4},{H8300_GPIO_P2,H8300_GPIO_B5},
  64         {H8300_GPIO_P2,H8300_GPIO_B6},{H8300_GPIO_P2,H8300_GPIO_B7},
  65 };
  66
  67 /* IRQ to GPIO pinno transrate */
  68 #define IRQ_GPIO_MAP(irqbit,irq,port,bit)                         \
  69 do {                                                              \
  70         if (*(volatile unsigned short *)ITSR & irqbit) {          \
  71                 port = irq_assign_table1[irq - EXT_IRQ0].port_no; \
  72                 bit  = irq_assign_table1[irq - EXT_IRQ0].bit_no;  \
  73         } else {                                                  \
  74                 port = irq_assign_table0[irq - EXT_IRQ0].port_no; \
  75                 bit  = irq_assign_table0[irq - EXT_IRQ0].bit_no;  \
  76         }                                                         \
  77 } while(0)
  78
  79 int h8300_enable_irq_pin(unsigned int irq)
  80 {
  81         if (irq >= EXT_IRQ0 && irq <= EXT_IRQ15) {
  82                 unsigned short ptn = 1 << (irq - EXT_IRQ0);
  83                 unsigned int port_no,bit_no;
  84                 IRQ_GPIO_MAP(ptn, irq, port_no, bit_no);
  85                 if (H8300_GPIO_RESERVE(port_no, bit_no) == 0)
  86                         return -EBUSY;                   /* pin already use */
  87                 H8300_GPIO_DDR(port_no, bit_no, H8300_GPIO_INPUT);
  88                 *(volatile unsigned short *)ISR &= ~ptn; /* ISR clear */
  89         }
  90
  91         return 0;
  92 }
  93
  94 void h8300_disable_irq_pin(unsigned int irq)
  95 {
  96         if (irq >= EXT_IRQ0 && irq <= EXT_IRQ15) {
  97                 /* disable interrupt & release IRQ pin */
  98                 unsigned short ptn = 1 << (irq - EXT_IRQ0);
  99                 unsigned short port_no,bit_no;
 100                 *(volatile unsigned short *)ISR &= ~ptn;
 101                 *(volatile unsigned short *)IER &= ~ptn;
 102                 IRQ_GPIO_MAP(ptn, irq, port_no, bit_no);
 103                 H8300_GPIO_FREE(port_no, bit_no);
 104         }
 105 }