LXR linux/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-internal.h>
  18#include <asm/regs267x.h>
  19
  20/* saved vector list */
  21const int __initconst 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 */
  30const H8300_VECTOR __initconst 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 */
  39struct irq_pins {
  40        unsigned char port_no;
  41        unsigned char bit_no;
  42} __attribute__((aligned(1),packed));
  43/* ISTR = 0 */
  44static 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 */
  55static 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)                         \
  68do {                                                              \
  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
  78int 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
  93void 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}
 105