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/*
* linux/arch/h8300/platform/h8s/ints_h8s.c
* Interrupt handling CPU variants
*
* Yoshinori Sato <ysato@users.sourceforge.jp>
*
*/
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <asm/ptrace.h>
#include <asm/traps.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/gpio-internal.h>
#include <asm/regs267x.h>
/* saved vector list */
const int __initdata h8300_saved_vectors[]={
#if defined(CONFIG_GDB_DEBUG)
TRACE_VEC,
TRAP3_VEC,
#endif
-1
};
/* trap entry table */
const H8300_VECTOR __initdata h8300_trap_table[] = {
0,0,0,0,0,
trace_break, /* TRACE */
0,0,
system_call, /* TRAPA #0 */
0,0,0,0,0,0,0
};
/* IRQ pin assignment */
struct irq_pins {
unsigned char port_no;
unsigned char bit_no;
} __attribute__((aligned(1),packed));
/* ISTR = 0 */
static const struct irq_pins irq_assign_table0[16]={
{H8300_GPIO_P5,H8300_GPIO_B0},{H8300_GPIO_P5,H8300_GPIO_B1},
{H8300_GPIO_P5,H8300_GPIO_B2},{H8300_GPIO_P5,H8300_GPIO_B3},
{H8300_GPIO_P5,H8300_GPIO_B4},{H8300_GPIO_P5,H8300_GPIO_B5},
{H8300_GPIO_P5,H8300_GPIO_B6},{H8300_GPIO_P5,H8300_GPIO_B7},
{H8300_GPIO_P6,H8300_GPIO_B0},{H8300_GPIO_P6,H8300_GPIO_B1},
{H8300_GPIO_P6,H8300_GPIO_B2},{H8300_GPIO_P6,H8300_GPIO_B3},
{H8300_GPIO_P6,H8300_GPIO_B4},{H8300_GPIO_P6,H8300_GPIO_B5},
{H8300_GPIO_PF,H8300_GPIO_B1},{H8300_GPIO_PF,H8300_GPIO_B2},
};
/* ISTR = 1 */
static const struct irq_pins irq_assign_table1[16]={
{H8300_GPIO_P8,H8300_GPIO_B0},{H8300_GPIO_P8,H8300_GPIO_B1},
{H8300_GPIO_P8,H8300_GPIO_B2},{H8300_GPIO_P8,H8300_GPIO_B3},
{H8300_GPIO_P8,H8300_GPIO_B4},{H8300_GPIO_P8,H8300_GPIO_B5},
{H8300_GPIO_PH,H8300_GPIO_B2},{H8300_GPIO_PH,H8300_GPIO_B3},
{H8300_GPIO_P2,H8300_GPIO_B0},{H8300_GPIO_P2,H8300_GPIO_B1},
{H8300_GPIO_P2,H8300_GPIO_B2},{H8300_GPIO_P2,H8300_GPIO_B3},
{H8300_GPIO_P2,H8300_GPIO_B4},{H8300_GPIO_P2,H8300_GPIO_B5},
{H8300_GPIO_P2,H8300_GPIO_B6},{H8300_GPIO_P2,H8300_GPIO_B7},
};
/* IRQ to GPIO pin translation */
#define IRQ_GPIO_MAP(irqbit,irq,port,bit) \
do { \
if (*(volatile unsigned short *)ITSR & irqbit) { \
port = irq_assign_table1[irq - EXT_IRQ0].port_no; \
bit = irq_assign_table1[irq - EXT_IRQ0].bit_no; \
} else { \
port = irq_assign_table0[irq - EXT_IRQ0].port_no; \
bit = irq_assign_table0[irq - EXT_IRQ0].bit_no; \
} \
} while(0)
int h8300_enable_irq_pin(unsigned int irq)
{
if (irq >= EXT_IRQ0 && irq <= EXT_IRQ15) {
unsigned short ptn = 1 << (irq - EXT_IRQ0);
unsigned int port_no,bit_no;
IRQ_GPIO_MAP(ptn, irq, port_no, bit_no);
if (H8300_GPIO_RESERVE(port_no, bit_no) == 0)
return -EBUSY; /* pin already use */
H8300_GPIO_DDR(port_no, bit_no, H8300_GPIO_INPUT);
*(volatile unsigned short *)ISR &= ~ptn; /* ISR clear */
}
return 0;
}
void h8300_disable_irq_pin(unsigned int irq)
{
if (irq >= EXT_IRQ0 && irq <= EXT_IRQ15) {
/* disable interrupt & release IRQ pin */
unsigned short ptn = 1 << (irq - EXT_IRQ0);
unsigned short port_no,bit_no;
*(volatile unsigned short *)ISR &= ~ptn;
*(volatile unsigned short *)IER &= ~ptn;
IRQ_GPIO_MAP(ptn, irq, port_no, bit_no);
H8300_GPIO_FREE(port_no, bit_no);
}
}
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