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96 lines
2.3 KiB
96 lines
2.3 KiB
/* ASB2364 FPGA interrupt multiplexing
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*
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* Copyright (C) 2010 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 Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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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 <unit/fpga-regs.h>
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/*
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* FPGA PIC operations
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*/
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static void asb2364_fpga_mask(unsigned int irq)
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{
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ASB2364_FPGA_REG_MASK(irq - NR_CPU_IRQS) = 0x0001;
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SyncExBus();
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}
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static void asb2364_fpga_ack(unsigned int irq)
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{
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ASB2364_FPGA_REG_IRQ(irq - NR_CPU_IRQS) = 0x0001;
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SyncExBus();
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}
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static void asb2364_fpga_mask_ack(unsigned int irq)
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{
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ASB2364_FPGA_REG_MASK(irq - NR_CPU_IRQS) = 0x0001;
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SyncExBus();
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ASB2364_FPGA_REG_IRQ(irq - NR_CPU_IRQS) = 0x0001;
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SyncExBus();
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}
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static void asb2364_fpga_unmask(unsigned int irq)
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{
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ASB2364_FPGA_REG_MASK(irq - NR_CPU_IRQS) = 0x0000;
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SyncExBus();
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}
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static struct irq_chip asb2364_fpga_pic = {
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.name = "fpga",
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.ack = asb2364_fpga_ack,
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.mask = asb2364_fpga_mask,
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.mask_ack = asb2364_fpga_mask_ack,
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.unmask = asb2364_fpga_unmask,
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};
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/*
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* FPGA PIC interrupt handler
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*/
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static irqreturn_t fpga_interrupt(int irq, void *_mask)
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{
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if ((ASB2364_FPGA_REG_IRQ_LAN & 0x0001) != 0x0001)
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generic_handle_irq(FPGA_LAN_IRQ);
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if ((ASB2364_FPGA_REG_IRQ_UART & 0x0001) != 0x0001)
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generic_handle_irq(FPGA_UART_IRQ);
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if ((ASB2364_FPGA_REG_IRQ_I2C & 0x0001) != 0x0001)
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generic_handle_irq(FPGA_I2C_IRQ);
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if ((ASB2364_FPGA_REG_IRQ_USB & 0x0001) != 0x0001)
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generic_handle_irq(FPGA_USB_IRQ);
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if ((ASB2364_FPGA_REG_IRQ_FPGA & 0x0001) != 0x0001)
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generic_handle_irq(FPGA_FPGA_IRQ);
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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 FPGA PIC output
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*/
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static struct irqaction fpga_irq[] = {
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[0] = {
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.handler = fpga_interrupt,
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.flags = IRQF_DISABLED | IRQF_SHARED,
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.name = "fpga",
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},
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};
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/*
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* Initialise the FPGA's PIC
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*/
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void __init irq_fpga_init(void)
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{
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int irq;
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for (irq = NR_CPU_IRQS; irq < NR_IRQS; irq++)
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set_irq_chip_and_handler(irq, &asb2364_fpga_pic, handle_level_irq);
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/* the FPGA drives the XIRQ1 input on the CPU PIC */
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setup_irq(XIRQ1, &fpga_irq[0]);
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}
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