diff options
Diffstat (limited to 'arch/mips/kernel/irq-mv6434x.c')
| -rw-r--r-- | arch/mips/kernel/irq-mv6434x.c | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/arch/mips/kernel/irq-mv6434x.c b/arch/mips/kernel/irq-mv6434x.c new file mode 100644 index 00000000000..088bbbc869e --- /dev/null +++ b/arch/mips/kernel/irq-mv6434x.c @@ -0,0 +1,161 @@ +/* + * Copyright 2002 Momentum Computer + * Author: mdharm@momenco.com + * Copyright (C) 2004 Ralf Baechle <ralf@linux-mips.org> + * + * 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/module.h> +#include <linux/interrupt.h> +#include <linux/kernel.h> +#include <asm/ptrace.h> +#include <linux/sched.h> +#include <linux/kernel_stat.h> +#include <asm/io.h> +#include <asm/irq.h> +#include <linux/mv643xx.h> + +static unsigned int irq_base; + +static inline int ls1bit32(unsigned int x) +{ + int b = 31, s; + + s = 16; if (x << 16 == 0) s = 0; b -= s; x <<= s; + s = 8; if (x << 8 == 0) s = 0; b -= s; x <<= s; + s = 4; if (x << 4 == 0) s = 0; b -= s; x <<= s; + s = 2; if (x << 2 == 0) s = 0; b -= s; x <<= s; + s = 1; if (x << 1 == 0) s = 0; b -= s; + + return b; +} + +/* mask off an interrupt -- 1 is enable, 0 is disable */ +static inline void mask_mv64340_irq(unsigned int irq) +{ + uint32_t value; + + if (irq < (irq_base + 32)) { + value = MV_READ(MV64340_INTERRUPT0_MASK_0_LOW); + value &= ~(1 << (irq - irq_base)); + MV_WRITE(MV64340_INTERRUPT0_MASK_0_LOW, value); + } else { + value = MV_READ(MV64340_INTERRUPT0_MASK_0_HIGH); + value &= ~(1 << (irq - irq_base - 32)); + MV_WRITE(MV64340_INTERRUPT0_MASK_0_HIGH, value); + } +} + +/* unmask an interrupt -- 1 is enable, 0 is disable */ +static inline void unmask_mv64340_irq(unsigned int irq) +{ + uint32_t value; + + if (irq < (irq_base + 32)) { + value = MV_READ(MV64340_INTERRUPT0_MASK_0_LOW); + value |= 1 << (irq - irq_base); + MV_WRITE(MV64340_INTERRUPT0_MASK_0_LOW, value); + } else { + value = MV_READ(MV64340_INTERRUPT0_MASK_0_HIGH); + value |= 1 << (irq - irq_base - 32); + MV_WRITE(MV64340_INTERRUPT0_MASK_0_HIGH, value); + } +} + +/* + * Enables the IRQ on Marvell Chip + */ +static void enable_mv64340_irq(unsigned int irq) +{ + unmask_mv64340_irq(irq); +} + +/* + * Initialize the IRQ on Marvell Chip + */ +static unsigned int startup_mv64340_irq(unsigned int irq) +{ + unmask_mv64340_irq(irq); + return 0; +} + +/* + * Disables the IRQ on Marvell Chip + */ +static void disable_mv64340_irq(unsigned int irq) +{ + mask_mv64340_irq(irq); +} + +/* + * Masks and ACKs an IRQ + */ +static void mask_and_ack_mv64340_irq(unsigned int irq) +{ + mask_mv64340_irq(irq); +} + +/* + * End IRQ processing + */ +static void end_mv64340_irq(unsigned int irq) +{ + if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS))) + unmask_mv64340_irq(irq); +} + +/* + * Interrupt handler for interrupts coming from the Marvell chip. + * It could be built in ethernet ports etc... + */ +void ll_mv64340_irq(struct pt_regs *regs) +{ + unsigned int irq_src_low, irq_src_high; + unsigned int irq_mask_low, irq_mask_high; + + /* read the interrupt status registers */ + irq_mask_low = MV_READ(MV64340_INTERRUPT0_MASK_0_LOW); + irq_mask_high = MV_READ(MV64340_INTERRUPT0_MASK_0_HIGH); + irq_src_low = MV_READ(MV64340_MAIN_INTERRUPT_CAUSE_LOW); + irq_src_high = MV_READ(MV64340_MAIN_INTERRUPT_CAUSE_HIGH); + + /* mask for just the interrupts we want */ + irq_src_low &= irq_mask_low; + irq_src_high &= irq_mask_high; + + if (irq_src_low) + do_IRQ(ls1bit32(irq_src_low) + irq_base, regs); + else + do_IRQ(ls1bit32(irq_src_high) + irq_base + 32, regs); +} + +#define shutdown_mv64340_irq disable_mv64340_irq + +struct hw_interrupt_type mv64340_irq_type = { + "MV-64340", + startup_mv64340_irq, + shutdown_mv64340_irq, + enable_mv64340_irq, + disable_mv64340_irq, + mask_and_ack_mv64340_irq, + end_mv64340_irq, + NULL +}; + +void __init mv64340_irq_init(unsigned int base) +{ + int i; + + /* Reset irq handlers pointers to NULL */ + for (i = base; i < base + 64; i++) { + irq_desc[i].status = IRQ_DISABLED; + irq_desc[i].action = 0; + irq_desc[i].depth = 2; + irq_desc[i].handler = &mv64340_irq_type; + } + + irq_base = base; +} |