You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
303 lines
7.9 KiB
303 lines
7.9 KiB
/*
|
|
* linux/arch/h8300/platform/h8s/ints.c
|
|
*
|
|
* Yoshinori Sato <ysato@users.sourceforge.jp>
|
|
*
|
|
* Based on linux/arch/$(ARCH)/platform/$(PLATFORM)/ints.c
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file COPYING in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Copyright 1996 Roman Zippel
|
|
* Copyright 1999 D. Jeff Dionne <jeff@rt-control.com>
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/types.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/kernel_stat.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/init.h>
|
|
#include <linux/bootmem.h>
|
|
#include <linux/random.h>
|
|
#include <linux/hardirq.h>
|
|
|
|
#include <asm/system.h>
|
|
#include <asm/irq.h>
|
|
#include <asm/traps.h>
|
|
#include <asm/io.h>
|
|
#include <asm/setup.h>
|
|
#include <asm/gpio.h>
|
|
#include <asm/regs267x.h>
|
|
#include <asm/errno.h>
|
|
|
|
/*
|
|
* This structure has only 4 elements for speed reasons
|
|
*/
|
|
typedef struct irq_handler {
|
|
irqreturn_t (*handler)(int, void *, struct pt_regs *);
|
|
int flags;
|
|
int count;
|
|
void *dev_id;
|
|
const char *devname;
|
|
} irq_handler_t;
|
|
|
|
static irq_handler_t *irq_list[NR_IRQS];
|
|
|
|
/* IRQ pin assignment */
|
|
struct irq_pins {
|
|
unsigned char port_no;
|
|
unsigned char bit_no;
|
|
};
|
|
/* ISTR = 0 */
|
|
const static 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 */
|
|
const static 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},
|
|
};
|
|
|
|
static short use_kmalloc = 0;
|
|
|
|
extern unsigned long *interrupt_redirect_table;
|
|
|
|
#define CPU_VECTOR ((unsigned long *)0x000000)
|
|
#define ADDR_MASK (0xffffff)
|
|
|
|
static inline unsigned long *get_vector_address(void)
|
|
{
|
|
volatile unsigned long *rom_vector = CPU_VECTOR;
|
|
unsigned long base,tmp;
|
|
int vec_no;
|
|
|
|
base = rom_vector[EXT_IRQ0] & ADDR_MASK;
|
|
|
|
/* check romvector format */
|
|
for (vec_no = EXT_IRQ1; vec_no <= EXT_IRQ15; vec_no++) {
|
|
if ((base+(vec_no - EXT_IRQ0)*4) != (rom_vector[vec_no] & ADDR_MASK))
|
|
return NULL;
|
|
}
|
|
|
|
/* ramvector base address */
|
|
base -= EXT_IRQ0*4;
|
|
|
|
/* writerble check */
|
|
tmp = ~(*(unsigned long *)base);
|
|
(*(unsigned long *)base) = tmp;
|
|
if ((*(unsigned long *)base) != tmp)
|
|
return NULL;
|
|
return (unsigned long *)base;
|
|
}
|
|
|
|
void __init init_IRQ(void)
|
|
{
|
|
#if defined(CONFIG_RAMKERNEL)
|
|
int i;
|
|
unsigned long *ramvec,*ramvec_p;
|
|
unsigned long break_vec;
|
|
|
|
ramvec = get_vector_address();
|
|
if (ramvec == NULL)
|
|
panic("interrupt vector serup failed.");
|
|
else
|
|
printk("virtual vector at 0x%08lx\n",(unsigned long)ramvec);
|
|
|
|
#if defined(CONFIG_GDB_DEBUG)
|
|
/* save orignal break vector */
|
|
break_vec = ramvec[TRAP3_VEC];
|
|
#else
|
|
break_vec = VECTOR(trace_break);
|
|
#endif
|
|
|
|
/* create redirect table */
|
|
for (ramvec_p = ramvec, i = 0; i < NR_IRQS; i++)
|
|
*ramvec_p++ = REDIRECT(interrupt_entry);
|
|
|
|
/* set special vector */
|
|
ramvec[TRAP0_VEC] = VECTOR(system_call);
|
|
ramvec[TRAP3_VEC] = break_vec;
|
|
interrupt_redirect_table = ramvec;
|
|
#ifdef DUMP_VECTOR
|
|
ramvec_p = ramvec;
|
|
for (i = 0; i < NR_IRQS; i++) {
|
|
if ((i % 8) == 0)
|
|
printk("\n%p: ",ramvec_p);
|
|
printk("%p ",*ramvec_p);
|
|
ramvec_p++;
|
|
}
|
|
printk("\n");
|
|
#endif
|
|
#endif
|
|
}
|
|
|
|
int request_irq(unsigned int irq,
|
|
irqreturn_t (*handler)(int, void *, struct pt_regs *),
|
|
unsigned long flags, const char *devname, void *dev_id)
|
|
{
|
|
unsigned short ptn = 1 << (irq - EXT_IRQ0);
|
|
irq_handler_t *irq_handle;
|
|
if (irq < 0 || irq >= NR_IRQS) {
|
|
printk("Incorrect IRQ %d from %s\n", irq, devname);
|
|
return -EINVAL;
|
|
}
|
|
if (irq_list[irq])
|
|
return -EBUSY; /* already used */
|
|
if (irq >= EXT_IRQ0 && irq <= EXT_IRQ15) {
|
|
/* initialize IRQ pin */
|
|
unsigned int port_no,bit_no;
|
|
if (*(volatile unsigned short *)ITSR & ptn) {
|
|
port_no = irq_assign_table1[irq - EXT_IRQ0].port_no;
|
|
bit_no = irq_assign_table1[irq - EXT_IRQ0].bit_no;
|
|
} else {
|
|
port_no = irq_assign_table0[irq - EXT_IRQ0].port_no;
|
|
bit_no = irq_assign_table0[irq - EXT_IRQ0].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 */
|
|
}
|
|
|
|
if (use_kmalloc)
|
|
irq_handle = (irq_handler_t *)kmalloc(sizeof(irq_handler_t), GFP_ATOMIC);
|
|
else {
|
|
/* use bootmem allocater */
|
|
irq_handle = (irq_handler_t *)alloc_bootmem(sizeof(irq_handler_t));
|
|
irq_handle = (irq_handler_t *)((unsigned long)irq_handle | 0x80000000);
|
|
}
|
|
|
|
if (irq_handle == NULL)
|
|
return -ENOMEM;
|
|
|
|
irq_handle->handler = handler;
|
|
irq_handle->flags = flags;
|
|
irq_handle->count = 0;
|
|
irq_handle->dev_id = dev_id;
|
|
irq_handle->devname = devname;
|
|
irq_list[irq] = irq_handle;
|
|
if (irq_handle->flags & SA_SAMPLE_RANDOM)
|
|
rand_initialize_irq(irq);
|
|
|
|
/* enable interrupt */
|
|
/* compatible i386 */
|
|
if (irq >= EXT_IRQ0 && irq <= EXT_IRQ15)
|
|
*(volatile unsigned short *)IER |= ptn;
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL(request_irq);
|
|
|
|
void free_irq(unsigned int irq, void *dev_id)
|
|
{
|
|
if (irq >= NR_IRQS)
|
|
return;
|
|
if (irq_list[irq]->dev_id != dev_id)
|
|
printk("%s: Removing probably wrong IRQ %d from %s\n",
|
|
__FUNCTION__, irq, irq_list[irq]->devname);
|
|
if (irq >= EXT_IRQ0 && irq <= EXT_IRQ15) {
|
|
/* disable interrupt & release IRQ pin */
|
|
unsigned short port_no,bit_no;
|
|
*(volatile unsigned short *)ISR &= ~(1 << (irq - EXT_IRQ0));
|
|
*(volatile unsigned short *)IER |= 1 << (irq - EXT_IRQ0);
|
|
if (*(volatile unsigned short *)ITSR & (1 << (irq - EXT_IRQ0))) {
|
|
port_no = irq_assign_table1[irq - EXT_IRQ0].port_no;
|
|
bit_no = irq_assign_table1[irq - EXT_IRQ0].bit_no;
|
|
} else {
|
|
port_no = irq_assign_table0[irq - EXT_IRQ0].port_no;
|
|
bit_no = irq_assign_table0[irq - EXT_IRQ0].bit_no;
|
|
}
|
|
H8300_GPIO_FREE(port_no, bit_no);
|
|
}
|
|
if (((unsigned long)irq_list[irq] & 0x80000000) == 0) {
|
|
kfree(irq_list[irq]);
|
|
irq_list[irq] = NULL;
|
|
}
|
|
}
|
|
|
|
EXPORT_SYMBOL(free_irq);
|
|
|
|
unsigned long probe_irq_on (void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL(probe_irq_on);
|
|
|
|
int probe_irq_off (unsigned long irqs)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL(probe_irq_off);
|
|
|
|
void enable_irq(unsigned int irq)
|
|
{
|
|
if (irq >= EXT_IRQ0 && irq <= EXT_IRQ15)
|
|
*(volatile unsigned short *)IER |= 1 << (irq - EXT_IRQ0);
|
|
}
|
|
|
|
void disable_irq(unsigned int irq)
|
|
{
|
|
if (irq >= EXT_IRQ0 && irq <= EXT_IRQ15)
|
|
*(volatile unsigned short *)IER &= ~(1 << (irq - EXT_IRQ0));
|
|
}
|
|
|
|
asmlinkage void process_int(unsigned long vec, struct pt_regs *fp)
|
|
{
|
|
irq_enter();
|
|
/* ISR clear */
|
|
/* compatible i386 */
|
|
if (vec >= EXT_IRQ0 && vec <= EXT_IRQ15)
|
|
*(volatile unsigned short *)ISR &= ~(1 << (vec - EXT_IRQ0));
|
|
if (vec < NR_IRQS) {
|
|
if (irq_list[vec]) {
|
|
irq_list[vec]->handler(vec, irq_list[vec]->dev_id, fp);
|
|
irq_list[vec]->count++;
|
|
if (irq_list[vec]->flags & SA_SAMPLE_RANDOM)
|
|
add_interrupt_randomness(vec);
|
|
}
|
|
} else {
|
|
BUG();
|
|
}
|
|
irq_exit();
|
|
}
|
|
|
|
int show_interrupts(struct seq_file *p, void *v)
|
|
{
|
|
int i = *(loff_t *) v;
|
|
|
|
if ((i < NR_IRQS) && (irq_list[i] !=NULL)) {
|
|
seq_printf(p, "%3d: %10u ",i,irq_list[i]->count);
|
|
seq_printf(p, "%s\n", irq_list[i]->devname);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void init_irq_proc(void)
|
|
{
|
|
}
|
|
|
|
static int __init enable_kmalloc(void)
|
|
{
|
|
use_kmalloc = 1;
|
|
return 0;
|
|
}
|
|
core_initcall(enable_kmalloc);
|
|
|