159 lines
3.6 KiB
C
159 lines
3.6 KiB
C
/* irq-mb93091.c: MB93091 FPGA interrupt handling
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*
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* Copyright (C) 2003 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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#define __reg16(ADDR) (*(volatile unsigned short *)(ADDR))
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#define __get_IMR() ({ __reg16(0xffc00004); })
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#define __set_IMR(M) do { __reg16(0xffc00004) = (M); wmb(); } while(0)
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#define __get_IFR() ({ __reg16(0xffc0000c); })
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#define __clr_IFR(M) do { __reg16(0xffc0000c) = ~(M); wmb(); } while(0)
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/*
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* on-motherboard FPGA PIC operations
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*/
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static void frv_fpga_mask(unsigned int irq)
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{
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uint16_t imr = __get_IMR();
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imr |= 1 << (irq - IRQ_BASE_FPGA);
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__set_IMR(imr);
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}
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static void frv_fpga_ack(unsigned int irq)
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{
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__clr_IFR(1 << (irq - IRQ_BASE_FPGA));
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}
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static void frv_fpga_mask_ack(unsigned int irq)
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{
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uint16_t imr = __get_IMR();
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imr |= 1 << (irq - IRQ_BASE_FPGA);
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__set_IMR(imr);
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__clr_IFR(1 << (irq - IRQ_BASE_FPGA));
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}
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static void frv_fpga_unmask(unsigned int irq)
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{
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uint16_t imr = __get_IMR();
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imr &= ~(1 << (irq - IRQ_BASE_FPGA));
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__set_IMR(imr);
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}
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static struct irq_chip frv_fpga_pic = {
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.name = "mb93091",
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.ack = frv_fpga_ack,
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.mask = frv_fpga_mask,
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.mask_ack = frv_fpga_mask_ack,
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.unmask = frv_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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uint16_t imr, mask = (unsigned long) _mask;
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imr = __get_IMR();
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mask = mask & ~imr & __get_IFR();
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/* poll all the triggered IRQs */
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while (mask) {
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int irq;
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asm("scan %1,gr0,%0" : "=r"(irq) : "r"(mask));
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irq = 31 - irq;
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mask &= ~(1 << irq);
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generic_handle_irq(IRQ_BASE_FPGA + 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 FPGA PIC output
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* - use dev_id to indicate the FPGA PIC input to output mappings
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*/
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static struct irqaction fpga_irq[4] = {
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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.0",
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.dev_id = (void *) 0x0028UL,
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},
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[1] = {
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.handler = fpga_interrupt,
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.flags = IRQF_DISABLED | IRQF_SHARED,
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.name = "fpga.1",
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.dev_id = (void *) 0x0050UL,
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},
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[2] = {
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.handler = fpga_interrupt,
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.flags = IRQF_DISABLED | IRQF_SHARED,
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.name = "fpga.2",
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.dev_id = (void *) 0x1c00UL,
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},
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[3] = {
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.handler = fpga_interrupt,
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.flags = IRQF_DISABLED | IRQF_SHARED,
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.name = "fpga.3",
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.dev_id = (void *) 0x6386UL,
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}
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};
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/*
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* initialise the motherboard FPGA's PIC
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*/
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void __init fpga_init(void)
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{
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int irq;
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/* all PIC inputs are all set to be low-level driven, apart from the
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* NMI button (15) which is fixed at falling-edge
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*/
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__set_IMR(0x7ffe);
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__clr_IFR(0x0000);
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for (irq = IRQ_BASE_FPGA + 1; irq <= IRQ_BASE_FPGA + 14; irq++)
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set_irq_chip_and_handler(irq, &frv_fpga_pic, handle_level_irq);
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set_irq_chip_and_handler(IRQ_FPGA_NMI, &frv_fpga_pic, handle_edge_irq);
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/* the FPGA drives the first four external IRQ inputs on the CPU PIC */
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setup_irq(IRQ_CPU_EXTERNAL0, &fpga_irq[0]);
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setup_irq(IRQ_CPU_EXTERNAL1, &fpga_irq[1]);
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setup_irq(IRQ_CPU_EXTERNAL2, &fpga_irq[2]);
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setup_irq(IRQ_CPU_EXTERNAL3, &fpga_irq[3]);
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}
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