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/*
* arch/mips/ddb5074/irq.c -- NEC DDB Vrc-5074 interrupt routines
*
* Copyright (C) 2000 Geert Uytterhoeven <geert@sonycom.com>
* Sony Software Development Center Europe (SDCE), Brussels
*/
#include <linux/config.h>
#include <linux/init.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/ptrace.h>
#include <asm/nile4.h>
#include <asm/ddb5074.h>
extern void __init i8259_init(void);
extern void i8259_disable_irq(unsigned int irq_nr);
extern void i8259_enable_irq(unsigned int irq_nr);
extern asmlinkage void ddbIRQ(void);
extern asmlinkage void i8259_do_irq(int irq, struct pt_regs *regs);
extern asmlinkage void do_IRQ(int irq, struct pt_regs *regs);
void no_action(int cpl, void *dev_id, struct pt_regs *regs)
{
}
#define M1543_PNP_CONFIG 0x03f0 /* PnP Config Port */
#define M1543_PNP_INDEX 0x03f0 /* PnP Index Port */
#define M1543_PNP_DATA 0x03f1 /* PnP Data Port */
#define M1543_PNP_ALT_CONFIG 0x0370 /* Alternative PnP Config Port */
#define M1543_PNP_ALT_INDEX 0x0370 /* Alternative PnP Index Port */
#define M1543_PNP_ALT_DATA 0x0371 /* Alternative PnP Data Port */
#define M1543_INT1_MASTER_CTRL 0x0020 /* INT_1 (master) Control Register */
#define M1543_INT1_MASTER_MASK 0x0021 /* INT_1 (master) Mask Register */
#define M1543_INT1_SLAVE_CTRL 0x00a0 /* INT_1 (slave) Control Register */
#define M1543_INT1_SLAVE_MASK 0x00a1 /* INT_1 (slave) Mask Register */
#define M1543_INT1_MASTER_ELCR 0x04d0 /* INT_1 (master) Edge/Level Control */
#define M1543_INT1_SLAVE_ELCR 0x04d1 /* INT_1 (slave) Edge/Level Control */
static void m1543_irq_setup(void)
{
/*
* The ALI M1543 has 13 interrupt inputs, IRQ1..IRQ13. Not all
* the possible IO sources in the M1543 are in use by us. We will
* use the following mapping:
*
* IRQ1 - keyboard (default set by M1543)
* IRQ3 - reserved for UART B (default set by M1543) (note that
* the schematics for the DDB Vrc-5074 board seem to
* indicate that IRQ3 is connected to the DS1386
* watchdog timer interrupt output so we might have
* a conflict)
* IRQ4 - reserved for UART A (default set by M1543)
* IRQ5 - parallel (default set by M1543)
* IRQ8 - DS1386 time of day (RTC) interrupt
* IRQ12 - mouse
*/
/*
* Assing mouse interrupt to IRQ12
*/
/* Enter configuration mode */
outb(0x51, M1543_PNP_CONFIG);
outb(0x23, M1543_PNP_CONFIG);
/* Select logical device 7 (Keyboard) */
outb(0x07, M1543_PNP_INDEX);
outb(0x07, M1543_PNP_DATA);
/* Select IRQ12 */
outb(0x72, M1543_PNP_INDEX);
outb(0x0c, M1543_PNP_DATA);
/* Leave configration mode */
outb(0xbb, M1543_PNP_CONFIG);
/* Initialize the 8259 PIC in the M1543 */
i8259_init();
/* Enable the interrupt cascade */
nile4_enable_irq(NILE4_INT_INTE);
request_region(M1543_PNP_CONFIG, 2, "M1543 config");
request_region(M1543_INT1_MASTER_ELCR, 2, "pic ELCR");
}
static void nile4_irq_setup(void)
{
int i;
/* Map all interrupts to CPU int #0 */
nile4_map_irq_all(0);
/* PCI INTA#-E# must be level triggered */
nile4_set_pci_irq_level_or_edge(0, 1);
nile4_set_pci_irq_level_or_edge(1, 1);
nile4_set_pci_irq_level_or_edge(2, 1);
nile4_set_pci_irq_level_or_edge(3, 1);
nile4_set_pci_irq_level_or_edge(4, 1);
/* PCI INTA#-D# must be active low, INTE# must be active high */
nile4_set_pci_irq_polarity(0, 0);
nile4_set_pci_irq_polarity(1, 0);
nile4_set_pci_irq_polarity(2, 0);
nile4_set_pci_irq_polarity(3, 0);
nile4_set_pci_irq_polarity(4, 1);
for (i = 0; i < 16; i++)
nile4_clear_irq(i);
/* Enable CPU int #0 */
nile4_enable_irq_output(0);
request_mem_region(NILE4_BASE, NILE4_SIZE, "Nile 4");
}
/*
* IRQ2 is cascade interrupt to second interrupt controller
*/
static struct irqaction irq2 = { no_action, 0, 0, "cascade", NULL, NULL };
void disable_irq(unsigned int irq_nr)
{
if (is_i8259_irq(irq_nr))
i8259_disable_irq(irq_nr);
else
nile4_disable_irq(irq_to_nile4(irq_nr));
}
void enable_irq(unsigned int irq_nr)
{
if (is_i8259_irq(irq_nr))
i8259_enable_irq(irq_nr);
else
nile4_enable_irq(irq_to_nile4(irq_nr));
}
int table[16] = { 0, };
void ddb_local0_irqdispatch(struct pt_regs *regs)
{
u32 mask;
int nile4_irq;
#if 1
volatile static int nesting = 0;
if (nesting++ == 0)
ddb5074_led_d3(1);
ddb5074_led_hex(nesting < 16 ? nesting : 15);
#endif
mask = nile4_get_irq_stat(0);
nile4_clear_irq_mask(mask);
/* Handle the timer interrupt first */
if (mask & (1 << NILE4_INT_GPT)) {
nile4_disable_irq(NILE4_INT_GPT);
do_IRQ(nile4_to_irq(NILE4_INT_GPT), regs);
nile4_enable_irq(NILE4_INT_GPT);
mask &= ~(1 << NILE4_INT_GPT);
}
for (nile4_irq = 0; mask; nile4_irq++, mask >>= 1)
if (mask & 1) {
nile4_disable_irq(nile4_irq);
if (nile4_irq == NILE4_INT_INTE) {
int i8259_irq = nile4_i8259_iack();
i8259_do_irq(i8259_irq, regs);
} else
do_IRQ(nile4_to_irq(nile4_irq), regs);
nile4_enable_irq(nile4_irq);
}
#if 1
if (--nesting == 0)
ddb5074_led_d3(0);
ddb5074_led_hex(nesting < 16 ? nesting : 15);
#endif
}
void ddb_local1_irqdispatch(void)
{
printk("ddb_local1_irqdispatch called\n");
}
void ddb_buserror_irq(void)
{
printk("ddb_buserror_irq called\n");
}
void ddb_8254timer_irq(void)
{
printk("ddb_8254timer_irq called\n");
}
void __init ddb_irq_setup(void)
{
#ifdef CONFIG_REMOTE_DEBUG
if (remote_debug)
set_debug_traps();
breakpoint(); /* you may move this line to whereever you want :-) */
#endif
request_region(0x20, 0x20, "pic1");
request_region(0xa0, 0x20, "pic2");
i8259_setup_irq(2, &irq2);
nile4_irq_setup();
m1543_irq_setup();
set_except_vector(0, ddbIRQ);
}
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