diff options
| -rw-r--r-- | arch/mips/loongson/Makefile | 6 | ||||
| -rw-r--r-- | arch/mips/loongson/lemote-2f/Makefile | 5 | ||||
| -rw-r--r-- | arch/mips/loongson/lemote-2f/irq.c | 132 |
3 files changed, 143 insertions, 0 deletions
diff --git a/arch/mips/loongson/Makefile b/arch/mips/loongson/Makefile index 39048c455d7..2b76cb0fb07 100644 --- a/arch/mips/loongson/Makefile +++ b/arch/mips/loongson/Makefile @@ -9,3 +9,9 @@ obj-$(CONFIG_MACH_LOONGSON) += common/ # obj-$(CONFIG_LEMOTE_FULOONG2E) += fuloong-2e/ + +# +# Lemote loongson2f family machines +# + +obj-$(CONFIG_LEMOTE_MACH2F) += lemote-2f/ diff --git a/arch/mips/loongson/lemote-2f/Makefile b/arch/mips/loongson/lemote-2f/Makefile new file mode 100644 index 00000000000..2e188974d56 --- /dev/null +++ b/arch/mips/loongson/lemote-2f/Makefile @@ -0,0 +1,5 @@ +# +# Makefile for lemote loongson2f family machines +# + +obj-y += irq.o diff --git a/arch/mips/loongson/lemote-2f/irq.c b/arch/mips/loongson/lemote-2f/irq.c new file mode 100644 index 00000000000..50e7bb6012b --- /dev/null +++ b/arch/mips/loongson/lemote-2f/irq.c @@ -0,0 +1,132 @@ +/* + * Copyright (C) 2007 Lemote Inc. + * Author: Fuxin Zhang, zhangfx@lemote.com + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + */ + +#include <linux/interrupt.h> + +#include <asm/irq_cpu.h> +#include <asm/i8259.h> +#include <asm/mipsregs.h> + +#include <loongson.h> +#include <machine.h> + +#define LOONGSON_TIMER_IRQ (MIPS_CPU_IRQ_BASE + 7) /* cpu timer */ +#define LOONGSON_PERFCNT_IRQ (MIPS_CPU_IRQ_BASE + 6) /* cpu perf counter */ +#define LOONGSON_NORTH_BRIDGE_IRQ (MIPS_CPU_IRQ_BASE + 6) /* bonito */ +#define LOONGSON_UART_IRQ (MIPS_CPU_IRQ_BASE + 3) /* cpu serial port */ +#define LOONGSON_SOUTH_BRIDGE_IRQ (MIPS_CPU_IRQ_BASE + 2) /* i8259 */ + +#define LOONGSON_INT_BIT_INT0 (1 << 11) +#define LOONGSON_INT_BIT_INT1 (1 << 12) + +/* + * The generic i8259_irq() make the kernel hang on booting. Since we cannot + * get the irq via the IRR directly, we access the ISR instead. + */ +static inline int mach_i8259_irq(void) +{ + int irq, isr; + + irq = -1; + + if ((LOONGSON_INTISR & LOONGSON_INTEN) & LOONGSON_INT_BIT_INT0) { + spin_lock(&i8259A_lock); + isr = inb(PIC_MASTER_CMD) & + ~inb(PIC_MASTER_IMR) & ~(1 << PIC_CASCADE_IR); + if (!isr) + isr = (inb(PIC_SLAVE_CMD) & ~inb(PIC_SLAVE_IMR)) << 8; + irq = ffs(isr) - 1; + if (unlikely(irq == 7)) { + /* + * This may be a spurious interrupt. + * + * Read the interrupt status register (ISR). If the most + * significant bit is not set then there is no valid + * interrupt. + */ + outb(0x0B, PIC_MASTER_ISR); /* ISR register */ + if (~inb(PIC_MASTER_ISR) & 0x80) + irq = -1; + } + spin_unlock(&i8259A_lock); + } + + return irq; +} + +static void i8259_irqdispatch(void) +{ + int irq; + + irq = mach_i8259_irq(); + if (irq >= 0) + do_IRQ(irq); + else + spurious_interrupt(); +} + +void mach_irq_dispatch(unsigned int pending) +{ + if (pending & CAUSEF_IP7) + do_IRQ(LOONGSON_TIMER_IRQ); + else if (pending & CAUSEF_IP6) { /* North Bridge, Perf counter */ +#ifdef CONFIG_OPROFILE + do_IRQ(LOONGSON2_PERFCNT_IRQ); +#endif + bonito_irqdispatch(); + } else if (pending & CAUSEF_IP3) /* CPU UART */ + do_IRQ(LOONGSON_UART_IRQ); + else if (pending & CAUSEF_IP2) /* South Bridge */ + i8259_irqdispatch(); + else + spurious_interrupt(); +} + +void __init set_irq_trigger_mode(void) +{ + /* setup cs5536 as high level trigger */ + LOONGSON_INTPOL = LOONGSON_INT_BIT_INT0 | LOONGSON_INT_BIT_INT1; + LOONGSON_INTEDGE &= ~(LOONGSON_INT_BIT_INT0 | LOONGSON_INT_BIT_INT1); +} + +static irqreturn_t ip6_action(int cpl, void *dev_id) +{ + return IRQ_HANDLED; +} + +struct irqaction ip6_irqaction = { + .handler = ip6_action, + .name = "cascade", + .flags = IRQF_SHARED, +}; + +struct irqaction cascade_irqaction = { + .handler = no_action, + .name = "cascade", +}; + +void __init mach_init_irq(void) +{ + /* init all controller + * 0-15 ------> i8259 interrupt + * 16-23 ------> mips cpu interrupt + * 32-63 ------> bonito irq + */ + + /* Sets the first-level interrupt dispatcher. */ + mips_cpu_irq_init(); + init_i8259_irqs(); + bonito_irq_init(); + + /* setup north bridge irq (bonito) */ + setup_irq(LOONGSON_NORTH_BRIDGE_IRQ, &ip6_irqaction); + /* setup source bridge irq (i8259) */ + setup_irq(LOONGSON_SOUTH_BRIDGE_IRQ, &cascade_irqaction); +} |