160 lines
3.8 KiB
C
160 lines
3.8 KiB
C
/* irq.c: FRV IRQ handling
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*
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* Copyright (C) 2003, 2004, 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/timex.h>
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#include <linux/random.h>
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#include <linux/init.h>
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#include <linux/kernel_stat.h>
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#include <linux/irq.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/module.h>
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#include <linux/bitops.h>
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#include <linux/atomic.h>
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#include <asm/io.h>
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#include <asm/smp.h>
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#include <linux/uaccess.h>
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#include <asm/pgalloc.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/gdb-stub.h>
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#define set_IRR(N,A,B,C,D) __set_IRR(N, (A << 28) | (B << 24) | (C << 20) | (D << 16))
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extern void __init fpga_init(void);
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#ifdef CONFIG_FUJITSU_MB93493
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extern void __init mb93493_init(void);
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#endif
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#define __reg16(ADDR) (*(volatile unsigned short *)(ADDR))
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atomic_t irq_err_count;
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int arch_show_interrupts(struct seq_file *p, int prec)
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{
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seq_printf(p, "%*s: ", prec, "ERR");
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seq_printf(p, "%10u\n", atomic_read(&irq_err_count));
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return 0;
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}
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/*
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* on-CPU PIC operations
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*/
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static void frv_cpupic_ack(struct irq_data *d)
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{
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__clr_RC(d->irq);
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__clr_IRL();
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}
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static void frv_cpupic_mask(struct irq_data *d)
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{
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__set_MASK(d->irq);
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}
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static void frv_cpupic_mask_ack(struct irq_data *d)
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{
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__set_MASK(d->irq);
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__clr_RC(d->irq);
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__clr_IRL();
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}
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static void frv_cpupic_unmask(struct irq_data *d)
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{
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__clr_MASK(d->irq);
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}
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static struct irq_chip frv_cpu_pic = {
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.name = "cpu",
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.irq_ack = frv_cpupic_ack,
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.irq_mask = frv_cpupic_mask,
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.irq_mask_ack = frv_cpupic_mask_ack,
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.irq_unmask = frv_cpupic_unmask,
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};
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/*
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* handles all normal device IRQs
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* - registers are referred to by the __frame variable (GR28)
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* - IRQ distribution is complicated in this arch because of the many PICs, the
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* way they work and the way they cascade
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*/
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asmlinkage void do_IRQ(void)
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{
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irq_enter();
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generic_handle_irq(__get_IRL());
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irq_exit();
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}
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/*
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* handles all NMIs when not co-opted by the debugger
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* - registers are referred to by the __frame variable (GR28)
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*/
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asmlinkage void do_NMI(void)
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{
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}
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/*
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* initialise the interrupt system
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*/
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void __init init_IRQ(void)
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{
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int level;
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for (level = 1; level <= 14; level++)
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irq_set_chip_and_handler(level, &frv_cpu_pic,
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handle_level_irq);
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irq_set_handler(IRQ_CPU_TIMER0, handle_edge_irq);
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/* set the trigger levels for internal interrupt sources
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* - timers all falling-edge
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* - ERR0 is rising-edge
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* - all others are high-level
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*/
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__set_IITMR(0, 0x003f0000); /* DMA0-3, TIMER0-2 */
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__set_IITMR(1, 0x20000000); /* ERR0-1, UART0-1, DMA4-7 */
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/* route internal interrupts */
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set_IRR(4, IRQ_DMA3_LEVEL, IRQ_DMA2_LEVEL, IRQ_DMA1_LEVEL,
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IRQ_DMA0_LEVEL);
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set_IRR(5, 0, IRQ_TIMER2_LEVEL, IRQ_TIMER1_LEVEL, IRQ_TIMER0_LEVEL);
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set_IRR(6, IRQ_GDBSTUB_LEVEL, IRQ_GDBSTUB_LEVEL,
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IRQ_UART1_LEVEL, IRQ_UART0_LEVEL);
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set_IRR(7, IRQ_DMA7_LEVEL, IRQ_DMA6_LEVEL, IRQ_DMA5_LEVEL,
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IRQ_DMA4_LEVEL);
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/* route external interrupts */
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set_IRR(2, IRQ_XIRQ7_LEVEL, IRQ_XIRQ6_LEVEL, IRQ_XIRQ5_LEVEL,
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IRQ_XIRQ4_LEVEL);
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set_IRR(3, IRQ_XIRQ3_LEVEL, IRQ_XIRQ2_LEVEL, IRQ_XIRQ1_LEVEL,
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IRQ_XIRQ0_LEVEL);
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#if defined(CONFIG_MB93091_VDK)
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__set_TM1(0x55550000); /* XIRQ7-0 all active low */
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#elif defined(CONFIG_MB93093_PDK)
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__set_TM1(0x15550000); /* XIRQ7 active high, 6-0 all active low */
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#else
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#error dont know external IRQ trigger levels for this setup
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#endif
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fpga_init();
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#ifdef CONFIG_FUJITSU_MB93493
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mb93493_init();
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#endif
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}
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