arch/frv/kernel/irq.c

   1 /* irq.c: FRV IRQ handling
   2  *
   3  * Copyright (C) 2003, 2004, 2006 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11
  12 #include <linux/ptrace.h>
  13 #include <linux/errno.h>
  14 #include <linux/signal.h>
  15 #include <linux/sched.h>
  16 #include <linux/ioport.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/timex.h>
  19 #include <linux/random.h>
  20 #include <linux/init.h>
  21 #include <linux/kernel_stat.h>
  22 #include <linux/irq.h>
  23 #include <linux/proc_fs.h>
  24 #include <linux/seq_file.h>
  25 #include <linux/module.h>
  26 #include <linux/bitops.h>
  27
  28 #include <linux/atomic.h>
  29 #include <asm/io.h>
  30 #include <asm/smp.h>
  31 #include <asm/system.h>
  32 #include <asm/uaccess.h>
  33 #include <asm/pgalloc.h>
  34 #include <asm/delay.h>
  35 #include <asm/irq.h>
  36 #include <asm/irc-regs.h>
  37 #include <asm/gdb-stub.h>
  38
  39 #define set_IRR(N,A,B,C,D) __set_IRR(N, (A << 28) | (B << 24) | (C << 20) | (D << 16))
  40
  41 extern void __init fpga_init(void);
  42 #ifdef CONFIG_FUJITSU_MB93493
  43 extern void __init mb93493_init(void);
  44 #endif
  45
  46 #define __reg16(ADDR) (*(volatile unsigned short *)(ADDR))
  47
  48 atomic_t irq_err_count;
  49
  50 int arch_show_interrupts(struct seq_file *p, int prec)
  51 {
  52         seq_printf(p, "%*s: ", prec, "ERR");
  53         seq_printf(p, "%10u\n", atomic_read(&irq_err_count));
  54         return 0;
  55 }
  56
  57 /*
  58  * on-CPU PIC operations
  59  */
  60 static void frv_cpupic_ack(struct irq_data *d)
  61 {
  62         __clr_RC(d->irq);
  63         __clr_IRL();
  64 }
  65
  66 static void frv_cpupic_mask(struct irq_data *d)
  67 {
  68         __set_MASK(d->irq);
  69 }
  70
  71 static void frv_cpupic_mask_ack(struct irq_data *d)
  72 {
  73         __set_MASK(d->irq);
  74         __clr_RC(d->irq);
  75         __clr_IRL();
  76 }
  77
  78 static void frv_cpupic_unmask(struct irq_data *d)
  79 {
  80         __clr_MASK(d->irq);
  81 }
  82
  83 static struct irq_chip frv_cpu_pic = {
  84         .name           = "cpu",
  85         .irq_ack        = frv_cpupic_ack,
  86         .irq_mask       = frv_cpupic_mask,
  87         .irq_mask_ack   = frv_cpupic_mask_ack,
  88         .irq_unmask     = frv_cpupic_unmask,
  89 };
  90
  91 /*
  92  * handles all normal device IRQs
  93  * - registers are referred to by the __frame variable (GR28)
  94  * - IRQ distribution is complicated in this arch because of the many PICs, the
  95  *   way they work and the way they cascade
  96  */
  97 asmlinkage void do_IRQ(void)
  98 {
  99         irq_enter();
 100         generic_handle_irq(__get_IRL());
 101         irq_exit();
 102 }
 103
 104 /*
 105  * handles all NMIs when not co-opted by the debugger
 106  * - registers are referred to by the __frame variable (GR28)
 107  */
 108 asmlinkage void do_NMI(void)
 109 {
 110 }
 111
 112 /*
 113  * initialise the interrupt system
 114  */
 115 void __init init_IRQ(void)
 116 {
 117         int level;
 118
 119         for (level = 1; level <= 14; level++)
 120                 irq_set_chip_and_handler(level, &frv_cpu_pic,
 121                                          handle_level_irq);
 122
 123         irq_set_handler(IRQ_CPU_TIMER0, handle_edge_irq);
 124
 125         /* set the trigger levels for internal interrupt sources
 126          * - timers all falling-edge
 127          * - ERR0 is rising-edge
 128          * - all others are high-level
 129          */
 130         __set_IITMR(0, 0x003f0000);     /* DMA0-3, TIMER0-2 */
 131         __set_IITMR(1, 0x20000000);     /* ERR0-1, UART0-1, DMA4-7 */
 132
 133         /* route internal interrupts */
 134         set_IRR(4, IRQ_DMA3_LEVEL, IRQ_DMA2_LEVEL, IRQ_DMA1_LEVEL,
 135                 IRQ_DMA0_LEVEL);
 136         set_IRR(5, 0, IRQ_TIMER2_LEVEL, IRQ_TIMER1_LEVEL, IRQ_TIMER0_LEVEL);
 137         set_IRR(6, IRQ_GDBSTUB_LEVEL, IRQ_GDBSTUB_LEVEL,
 138                 IRQ_UART1_LEVEL, IRQ_UART0_LEVEL);
 139         set_IRR(7, IRQ_DMA7_LEVEL, IRQ_DMA6_LEVEL, IRQ_DMA5_LEVEL,
 140                 IRQ_DMA4_LEVEL);
 141
 142         /* route external interrupts */
 143         set_IRR(2, IRQ_XIRQ7_LEVEL, IRQ_XIRQ6_LEVEL, IRQ_XIRQ5_LEVEL,
 144                 IRQ_XIRQ4_LEVEL);
 145         set_IRR(3, IRQ_XIRQ3_LEVEL, IRQ_XIRQ2_LEVEL, IRQ_XIRQ1_LEVEL,
 146                 IRQ_XIRQ0_LEVEL);
 147
 148 #if defined(CONFIG_MB93091_VDK)
 149         __set_TM1(0x55550000);          /* XIRQ7-0 all active low */
 150 #elif defined(CONFIG_MB93093_PDK)
 151         __set_TM1(0x15550000);          /* XIRQ7 active high, 6-0 all active low */
 152 #else
 153 #error dont know external IRQ trigger levels for this setup
 154 #endif
 155
 156         fpga_init();
 157 #ifdef CONFIG_FUJITSU_MB93493
 158         mb93493_init();
 159 #endif
 160 }