188 lines
4.2 KiB
C
188 lines
4.2 KiB
C
/*
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* Copyright (c) 2004 MIPS Inc
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* Author: chris@mips.com
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <asm/ptrace.h>
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#include <linux/sched.h>
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#include <linux/kernel_stat.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <asm/msc01_ic.h>
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static unsigned long _icctrl_msc;
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#define MSC01_IC_REG_BASE _icctrl_msc
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#define MSCIC_WRITE(reg, data) do { *(volatile u32 *)(reg) = data; } while (0)
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#define MSCIC_READ(reg, data) do { data = *(volatile u32 *)(reg); } while (0)
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static unsigned int irq_base;
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/* mask off an interrupt */
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static inline void mask_msc_irq(unsigned int irq)
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{
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if (irq < (irq_base + 32))
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MSCIC_WRITE(MSC01_IC_DISL, 1<<(irq - irq_base));
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else
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MSCIC_WRITE(MSC01_IC_DISH, 1<<(irq - irq_base - 32));
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}
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/* unmask an interrupt */
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static inline void unmask_msc_irq(unsigned int irq)
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{
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if (irq < (irq_base + 32))
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MSCIC_WRITE(MSC01_IC_ENAL, 1<<(irq - irq_base));
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else
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MSCIC_WRITE(MSC01_IC_ENAH, 1<<(irq - irq_base - 32));
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}
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/*
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* Enables the IRQ on SOC-it
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*/
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static void enable_msc_irq(unsigned int irq)
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{
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unmask_msc_irq(irq);
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}
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/*
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* Initialize the IRQ on SOC-it
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*/
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static unsigned int startup_msc_irq(unsigned int irq)
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{
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unmask_msc_irq(irq);
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return 0;
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}
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/*
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* Disables the IRQ on SOC-it
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*/
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static void disable_msc_irq(unsigned int irq)
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{
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mask_msc_irq(irq);
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}
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/*
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* Masks and ACKs an IRQ
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*/
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static void level_mask_and_ack_msc_irq(unsigned int irq)
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{
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mask_msc_irq(irq);
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if (!cpu_has_ei)
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MSCIC_WRITE(MSC01_IC_EOI, 0);
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}
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/*
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* Masks and ACKs an IRQ
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*/
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static void edge_mask_and_ack_msc_irq(unsigned int irq)
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{
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mask_msc_irq(irq);
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if (!cpu_has_ei)
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MSCIC_WRITE(MSC01_IC_EOI, 0);
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else {
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u32 r;
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MSCIC_READ(MSC01_IC_SUP+irq*8, r);
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MSCIC_WRITE(MSC01_IC_SUP+irq*8, r | ~MSC01_IC_SUP_EDGE_BIT);
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MSCIC_WRITE(MSC01_IC_SUP+irq*8, r);
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}
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}
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/*
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* End IRQ processing
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*/
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static void end_msc_irq(unsigned int irq)
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{
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if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
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unmask_msc_irq(irq);
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}
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/*
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* Interrupt handler for interrupts coming from SOC-it.
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*/
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void ll_msc_irq(struct pt_regs *regs)
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{
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unsigned int irq;
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/* read the interrupt vector register */
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MSCIC_READ(MSC01_IC_VEC, irq);
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if (irq < 64)
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do_IRQ(irq + irq_base, regs);
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else {
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/* Ignore spurious interrupt */
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}
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}
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void
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msc_bind_eic_interrupt (unsigned int irq, unsigned int set)
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{
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MSCIC_WRITE(MSC01_IC_RAMW,
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(irq<<MSC01_IC_RAMW_ADDR_SHF) | (set<<MSC01_IC_RAMW_DATA_SHF));
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}
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#define shutdown_msc_irq disable_msc_irq
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struct hw_interrupt_type msc_levelirq_type = {
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.typename = "SOC-it-Level",
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.startup = startup_msc_irq,
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.shutdown = shutdown_msc_irq,
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.enable = enable_msc_irq,
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.disable = disable_msc_irq,
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.ack = level_mask_and_ack_msc_irq,
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.end = end_msc_irq,
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};
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struct hw_interrupt_type msc_edgeirq_type = {
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.typename = "SOC-it-Edge",
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.startup =startup_msc_irq,
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.shutdown = shutdown_msc_irq,
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.enable = enable_msc_irq,
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.disable = disable_msc_irq,
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.ack = edge_mask_and_ack_msc_irq,
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.end = end_msc_irq,
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};
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void __init init_msc_irqs(unsigned int base, msc_irqmap_t *imp, int nirq)
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{
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extern void (*board_bind_eic_interrupt)(unsigned int irq, unsigned int regset);
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_icctrl_msc = (unsigned long) ioremap (MIPS_MSC01_IC_REG_BASE, 0x40000);
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/* Reset interrupt controller - initialises all registers to 0 */
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MSCIC_WRITE(MSC01_IC_RST, MSC01_IC_RST_RST_BIT);
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board_bind_eic_interrupt = &msc_bind_eic_interrupt;
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for (; nirq >= 0; nirq--, imp++) {
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int n = imp->im_irq;
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switch (imp->im_type) {
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case MSC01_IRQ_EDGE:
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irq_desc[base+n].handler = &msc_edgeirq_type;
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if (cpu_has_ei)
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MSCIC_WRITE(MSC01_IC_SUP+n*8, MSC01_IC_SUP_EDGE_BIT);
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else
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MSCIC_WRITE(MSC01_IC_SUP+n*8, MSC01_IC_SUP_EDGE_BIT | imp->im_lvl);
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break;
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case MSC01_IRQ_LEVEL:
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irq_desc[base+n].handler = &msc_levelirq_type;
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if (cpu_has_ei)
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MSCIC_WRITE(MSC01_IC_SUP+n*8, 0);
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else
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MSCIC_WRITE(MSC01_IC_SUP+n*8, imp->im_lvl);
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}
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}
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irq_base = base;
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MSCIC_WRITE(MSC01_IC_GENA, MSC01_IC_GENA_GENA_BIT); /* Enable interrupt generation */
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}
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