openwrtv3/target/linux/aruba-2.6/files/arch/mips/aruba/irq.c

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#include <linux/errno.h>
#include <linux/init.h>
#include <linux/kernel_stat.h>
#include <linux/module.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/timex.h>
#include <linux/slab.h>
#include <linux/random.h>
#include <linux/delay.h>
#include <asm/bitops.h>
#include <asm/bootinfo.h>
#include <asm/io.h>
#include <asm/mipsregs.h>
#include <asm/system.h>
#include <asm/idt-boards/rc32434/rc32434.h>
#include <asm/idt-boards/rc32434/rc32434_gpio.h>
#include <asm/irq.h>
extern void aruba_timer_interrupt(struct pt_regs *regs);
typedef struct {
u32 mask;
volatile u32 *base_addr;
} intr_group_t;
static const intr_group_t intr_group_merlot[NUM_INTR_GROUPS] = {
{0x00000000, (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 0)},
};
#define READ_PEND_MERLOT(base) (*((volatile unsigned long *)(0xbc003010)))
#define READ_MASK_MERLOT(base) (*((volatile unsigned long *)(0xbc003014)))
#define WRITE_MASK_MERLOT(base, val) ((*((volatile unsigned long *)(0xbc003014))) = (val), READ_MASK_MERLOT())
static const intr_group_t intr_group_muscat[NUM_INTR_GROUPS] = {
{0x0000efff, (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 0 * IC_GROUP_OFFSET)},
{0x00001fff, (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 1 * IC_GROUP_OFFSET)},
{0x00000007, (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 2 * IC_GROUP_OFFSET)},
{0x0003ffff, (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 3 * IC_GROUP_OFFSET)},
{0xffffffff, (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 4 * IC_GROUP_OFFSET)}
};
#define READ_PEND_MUSCAT(base) (*(base))
#define READ_MASK_MUSCAT(base) (*(base + 2))
#define WRITE_MASK_MUSCAT(base, val) (*(base + 2) = (val))
static inline int group_to_ip(unsigned int group)
{
switch (mips_machtype) {
case MACH_ARUBA_AP70:
return group + 2;
case MACH_ARUBA_AP65:
case MACH_ARUBA_AP60:
default:
return 6;
}
}
static inline void enable_local_irq(unsigned int irq)
{
clear_c0_cause(0x100 << irq);
set_c0_status(0x100 << irq);
irq_enable_hazard();
}
static inline void disable_local_irq(unsigned int irq)
{
clear_c0_status(0x100 << irq);
clear_c0_cause(0x100 << irq);
irq_disable_hazard();
}
static inline void aruba_irq_enable(unsigned int irq)
{
unsigned long flags;
unsigned int group, intr_bit;
volatile unsigned int *addr;
local_irq_save(flags);
if (irq < GROUP0_IRQ_BASE) {
enable_local_irq(irq);
} else {
int ip = irq - GROUP0_IRQ_BASE;
switch (mips_machtype) {
case MACH_ARUBA_AP70:
if (irq >= GROUP4_IRQ_BASE)
idt_gpio->gpioistat &= ~(1 << (irq - GROUP4_IRQ_BASE));
// irqs are in groups of 32
// ip is set to the remainder
group = ip >> 5;
ip &= 0x1f;
// bit -> 0 = unmask
intr_bit = 1 << ip;
addr = intr_group_muscat[group].base_addr;
WRITE_MASK_MUSCAT(addr, READ_MASK_MUSCAT(addr) & ~intr_bit);
break;
case MACH_ARUBA_AP65:
case MACH_ARUBA_AP60:
group = 0;
// bit -> 1 = unmasked
intr_bit = 1 << ip;
addr = intr_group_merlot[group].base_addr;
WRITE_MASK_MERLOT(addr, READ_MASK_MERLOT(addr) | intr_bit);
break;
}
enable_local_irq(group_to_ip(group));
}
back_to_back_c0_hazard();
local_irq_restore(flags);
}
static void aruba_irq_disable(unsigned int irq)
{
unsigned long flags;
unsigned int group, intr_bit, mask;
volatile unsigned int *addr;
local_irq_save(flags);
if (irq < GROUP0_IRQ_BASE) {
disable_local_irq(irq);
} else {
int ip = irq - GROUP0_IRQ_BASE;
switch (mips_machtype) {
case MACH_ARUBA_AP70:
idt_gpio->gpioistat &= ~(1 << ip);
// irqs are in groups of 32
// ip is set to the remainder
group = ip >> 5;
ip &= 0x1f;
// bit -> 1 = mask
intr_bit = 1 << ip;
addr = intr_group_muscat[group].base_addr;
mask = READ_MASK_MUSCAT(addr);
mask |= intr_bit;
WRITE_MASK_MUSCAT(addr, mask);
if (mask == intr_group_muscat[group].mask) {
disable_local_irq(group_to_ip(group));
}
break;
case MACH_ARUBA_AP65:
case MACH_ARUBA_AP60:
group = 0;
// bit -> 0 = masked
intr_bit = 1 << ip;
addr = intr_group_merlot[group].base_addr;
mask = READ_MASK_MERLOT(addr);
mask &= ~intr_bit;
WRITE_MASK_MERLOT(addr, mask);
if (mask == intr_group_merlot[group].mask) {
disable_local_irq(group_to_ip(group));
}
break;
}
}
back_to_back_c0_hazard();
local_irq_restore(flags);
}
static unsigned int aruba_irq_startup(unsigned int irq)
{
aruba_irq_enable(irq);
return 0;
}
#define aruba_irq_shutdown aruba_irq_disable
static void aruba_irq_ack(unsigned int irq)
{
aruba_irq_disable(irq);
}
static void aruba_irq_end(unsigned int irq)
{
if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
aruba_irq_enable(irq);
}
static struct hw_interrupt_type aruba_irq_type = {
.typename = "ARUBA",
.startup = aruba_irq_startup,
.shutdown = aruba_irq_shutdown,
.enable = aruba_irq_enable,
.disable = aruba_irq_disable,
.ack = aruba_irq_ack,
.end = aruba_irq_end,
};
void __init arch_init_irq(void)
{
int i;
printk("Initializing IRQ's: %d out of %d\n", RC32434_NR_IRQS, NR_IRQS);
memset(irq_desc, 0, sizeof(irq_desc));
for (i = 0; i < RC32434_NR_IRQS; i++) {
irq_desc[i].status = IRQ_DISABLED;
irq_desc[i].action = NULL;
irq_desc[i].depth = 1;
irq_desc[i].chip = &aruba_irq_type;
spin_lock_init(&irq_desc[i].lock);
}
}
/* Main Interrupt dispatcher */
void plat_irq_dispatch(struct pt_regs *regs)
{
unsigned int pend, group, ip;
volatile unsigned int *addr;
unsigned long cp0_cause = read_c0_cause() & read_c0_status() & CAUSEF_IP;
if (cp0_cause & CAUSEF_IP7)
return aruba_timer_interrupt(regs);
if(cp0_cause == 0) {
printk("INTERRUPT(S) FIRED WHILE MASKED\n");
#ifdef ARUBA_DEBUG
// debuging use -- figure out which interrupt(s) fired
cp0_cause = read_c0_cause() & CAUSEF_IP;
while (cp0_cause) {
unsigned long intr_bit;
unsigned int irq_nr;
intr_bit = (31 - rc32434_clz(cp0_cause));
irq_nr = intr_bit - GROUP0_IRQ_BASE;
printk(" ---> MASKED IRQ %d\n",irq_nr);
cp0_cause &= ~(1 << intr_bit);
}
#endif
return;
}
switch (mips_machtype) {
case MACH_ARUBA_AP70:
if ((ip = (cp0_cause & 0x7c00))) {
group = 21 - rc32434_clz(ip);
addr = intr_group_muscat[group].base_addr;
pend = READ_PEND_MUSCAT(addr);
pend &= ~READ_MASK_MUSCAT(addr); // only unmasked interrupts
pend = 39 - rc32434_clz(pend);
do_IRQ(pend + (group << 5));
}
break;
case MACH_ARUBA_AP65:
case MACH_ARUBA_AP60:
default:
if (cp0_cause & 0x4000) { // 1 << (8 +6) == irq 6
// Misc Interrupt
group = 0;
addr = intr_group_merlot[group].base_addr;
pend = READ_PEND_MERLOT(addr);
pend &= READ_MASK_MERLOT(addr); // only unmasked interrupts
pend = 31 - rc32434_clz(pend);
do_IRQ(pend + GROUP0_IRQ_BASE);
}
if ((ip = (cp0_cause & 0x3c00))) { // irq 2-5
pend = 31 - rc32434_clz(ip);
do_IRQ(pend - GROUP0_IRQ_BASE);
}
break;
}
}