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MN10300: ASB2364: Handle the IRQ multiplexer in the FPGA

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Handle the IRQ multiplexer in the FPGA by implementing a cascade interrupt
driver for it.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells
2010-10-27 17:28:58 +01:00
parent 730c1fad0e
commit 6044cf1d94
7 changed files with 165 additions and 18 deletions
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96
arch/mn10300/unit-asb2364/irq-fpga.c Normal file
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/* ASB2364 FPGA interrupt multiplexing
*
* Copyright (C) 2010 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public Licence
* as published by the Free Software Foundation; either version
* 2 of the Licence, or (at your option) any later version.
*/
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <unit/fpga-regs.h>
/*
* FPGA PIC operations
*/
static void asb2364_fpga_mask(unsigned int irq)
{
ASB2364_FPGA_REG_MASK(irq - NR_CPU_IRQS) = 0x0001;
SyncExBus();
}
static void asb2364_fpga_ack(unsigned int irq)
{
ASB2364_FPGA_REG_IRQ(irq - NR_CPU_IRQS) = 0x0001;
SyncExBus();
}
static void asb2364_fpga_mask_ack(unsigned int irq)
{
ASB2364_FPGA_REG_MASK(irq - NR_CPU_IRQS) = 0x0001;
SyncExBus();
ASB2364_FPGA_REG_IRQ(irq - NR_CPU_IRQS) = 0x0001;
SyncExBus();
}
static void asb2364_fpga_unmask(unsigned int irq)
{
ASB2364_FPGA_REG_MASK(irq - NR_CPU_IRQS) = 0x0000;
SyncExBus();
}
static struct irq_chip asb2364_fpga_pic = {
.name = "fpga",
.ack = asb2364_fpga_ack,
.mask = asb2364_fpga_mask,
.mask_ack = asb2364_fpga_mask_ack,
.unmask = asb2364_fpga_unmask,
};
/*
* FPGA PIC interrupt handler
*/
static irqreturn_t fpga_interrupt(int irq, void *_mask)
{
if ((ASB2364_FPGA_REG_IRQ_LAN & 0x0001) != 0x0001)
generic_handle_irq(FPGA_LAN_IRQ);
if ((ASB2364_FPGA_REG_IRQ_UART & 0x0001) != 0x0001)
generic_handle_irq(FPGA_UART_IRQ);
if ((ASB2364_FPGA_REG_IRQ_I2C & 0x0001) != 0x0001)
generic_handle_irq(FPGA_I2C_IRQ);
if ((ASB2364_FPGA_REG_IRQ_USB & 0x0001) != 0x0001)
generic_handle_irq(FPGA_USB_IRQ);
if ((ASB2364_FPGA_REG_IRQ_FPGA & 0x0001) != 0x0001)
generic_handle_irq(FPGA_FPGA_IRQ);
return IRQ_HANDLED;
}
/*
* Define an interrupt action for each FPGA PIC output
*/
static struct irqaction fpga_irq[] = {
[0] = {
.handler = fpga_interrupt,
.flags = IRQF_DISABLED | IRQF_SHARED,
.name = "fpga",
},
};
/*
* Initialise the FPGA's PIC
*/
void __init irq_fpga_init(void)
{
int irq;
for (irq = NR_CPU_IRQS; irq < NR_IRQS; irq++)
set_irq_chip_and_handler(irq, &asb2364_fpga_pic, handle_level_irq);
/* the FPGA drives the XIRQ1 input on the CPU PIC */
setup_irq(XIRQ1, &fpga_irq[0]);
}