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Diffstat (limited to 'target/linux/aruba-2.6/patches/002-irq.patch')
-rw-r--r--target/linux/aruba-2.6/patches/002-irq.patch286
1 files changed, 286 insertions, 0 deletions
diff --git a/target/linux/aruba-2.6/patches/002-irq.patch b/target/linux/aruba-2.6/patches/002-irq.patch
new file mode 100644
index 0000000..f6b9425
--- /dev/null
+++ b/target/linux/aruba-2.6/patches/002-irq.patch
@@ -0,0 +1,286 @@
+diff -Nur linux-2.6.17/arch/mips/aruba/irq.c linux-2.6.17-openwrt/arch/mips/aruba/irq.c
+--- linux-2.6.17/arch/mips/aruba/irq.c 1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.17-openwrt/arch/mips/aruba/irq.c 2006-10-12 14:32:40.026285000 -0700
+@@ -0,0 +1,282 @@
++#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:
++ // 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].handler = &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), regs);
++ }
++ 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, regs);
++ }
++ if ((ip = (cp0_cause & 0x3c00))) { // irq 2-5
++ pend = 31 - rc32434_clz(ip);
++ do_IRQ(pend - GROUP0_IRQ_BASE, regs);
++ }
++ break;
++ }
++}