150 lines
3.6 KiB
C
150 lines
3.6 KiB
C
/* irq-mb93493.c: MB93493 companion chip interrupt handler
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*
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* Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/ptrace.h>
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#include <linux/errno.h>
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/ioport.h>
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#include <linux/interrupt.h>
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#include <linux/init.h>
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#include <linux/irq.h>
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#include <linux/bitops.h>
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#include <asm/io.h>
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#include <asm/system.h>
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#include <asm/delay.h>
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#include <asm/irq.h>
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#include <asm/irc-regs.h>
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#include <asm/mb93493-irqs.h>
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#include <asm/mb93493-regs.h>
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#define IRQ_ROUTE_ONE(X) (X##_ROUTE << (X - IRQ_BASE_MB93493))
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#define IRQ_ROUTING \
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(IRQ_ROUTE_ONE(IRQ_MB93493_VDC) | \
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IRQ_ROUTE_ONE(IRQ_MB93493_VCC) | \
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IRQ_ROUTE_ONE(IRQ_MB93493_AUDIO_OUT) | \
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IRQ_ROUTE_ONE(IRQ_MB93493_I2C_0) | \
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IRQ_ROUTE_ONE(IRQ_MB93493_I2C_1) | \
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IRQ_ROUTE_ONE(IRQ_MB93493_USB) | \
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IRQ_ROUTE_ONE(IRQ_MB93493_LOCAL_BUS) | \
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IRQ_ROUTE_ONE(IRQ_MB93493_PCMCIA) | \
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IRQ_ROUTE_ONE(IRQ_MB93493_GPIO) | \
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IRQ_ROUTE_ONE(IRQ_MB93493_AUDIO_IN))
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/*
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* daughter board PIC operations
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* - there is no way to ACK interrupts in the MB93493 chip
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*/
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static void frv_mb93493_mask(unsigned int irq)
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{
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uint32_t iqsr;
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volatile void *piqsr;
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if (IRQ_ROUTING & (1 << (irq - IRQ_BASE_MB93493)))
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piqsr = __addr_MB93493_IQSR(1);
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else
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piqsr = __addr_MB93493_IQSR(0);
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iqsr = readl(piqsr);
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iqsr &= ~(1 << (irq - IRQ_BASE_MB93493 + 16));
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writel(iqsr, piqsr);
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}
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static void frv_mb93493_ack(unsigned int irq)
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{
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}
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static void frv_mb93493_unmask(unsigned int irq)
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{
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uint32_t iqsr;
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volatile void *piqsr;
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if (IRQ_ROUTING & (1 << (irq - IRQ_BASE_MB93493)))
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piqsr = __addr_MB93493_IQSR(1);
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else
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piqsr = __addr_MB93493_IQSR(0);
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iqsr = readl(piqsr);
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iqsr |= 1 << (irq - IRQ_BASE_MB93493 + 16);
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writel(iqsr, piqsr);
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}
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static struct irq_chip frv_mb93493_pic = {
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.name = "mb93093",
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.ack = frv_mb93493_ack,
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.mask = frv_mb93493_mask,
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.mask_ack = frv_mb93493_mask,
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.unmask = frv_mb93493_unmask,
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};
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/*
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* MB93493 PIC interrupt handler
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*/
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static irqreturn_t mb93493_interrupt(int irq, void *_piqsr)
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{
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volatile void *piqsr = _piqsr;
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uint32_t iqsr;
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iqsr = readl(piqsr);
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iqsr = iqsr & (iqsr >> 16) & 0xffff;
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/* poll all the triggered IRQs */
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while (iqsr) {
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int irq;
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asm("scan %1,gr0,%0" : "=r"(irq) : "r"(iqsr));
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irq = 31 - irq;
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iqsr &= ~(1 << irq);
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generic_handle_irq(IRQ_BASE_MB93493 + irq);
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}
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return IRQ_HANDLED;
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}
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/*
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* define an interrupt action for each MB93493 PIC output
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* - use dev_id to indicate the MB93493 PIC input to output mappings
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*/
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static struct irqaction mb93493_irq[2] = {
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[0] = {
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.handler = mb93493_interrupt,
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.flags = IRQF_DISABLED | IRQF_SHARED,
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.mask = CPU_MASK_NONE,
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.name = "mb93493.0",
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.dev_id = (void *) __addr_MB93493_IQSR(0),
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},
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[1] = {
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.handler = mb93493_interrupt,
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.flags = IRQF_DISABLED | IRQF_SHARED,
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.mask = CPU_MASK_NONE,
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.name = "mb93493.1",
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.dev_id = (void *) __addr_MB93493_IQSR(1),
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}
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};
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/*
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* initialise the motherboard MB93493's PIC
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*/
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void __init mb93493_init(void)
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{
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int irq;
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for (irq = IRQ_BASE_MB93493 + 0; irq <= IRQ_BASE_MB93493 + 10; irq++)
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set_irq_chip_and_handler(irq, &frv_mb93493_pic, handle_edge_irq);
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/* the MB93493 drives external IRQ inputs on the CPU PIC */
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setup_irq(IRQ_CPU_MB93493_0, &mb93493_irq[0]);
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setup_irq(IRQ_CPU_MB93493_1, &mb93493_irq[1]);
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}
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