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 <asm/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 /*
  51  * Generic, controller-independent functions:
  52  */
  53 int show_interrupts(struct seq_file *p, void *v)
  54 {
  55         int i = *(loff_t *) v, cpu;
  56         struct irqaction * action;
  57         unsigned long flags;
  58
  59         if (i == 0) {
  60                 char cpuname[12];
  61
  62                 seq_printf(p, "    ");
  63                 for_each_present_cpu(cpu) {
  64                         sprintf(cpuname, "CPU%d", cpu);
  65                         seq_printf(p, " %10s", cpuname);
  66                 }
  67                 seq_putc(p, '\n');
  68         }
  69
  70         if (i < NR_IRQS) {
  71                 raw_spin_lock_irqsave(&irq_desc[i].lock, flags);
  72                 action = irq_desc[i].action;
  73                 if (action) {
  74                         seq_printf(p, "%3d: ", i);
  75                         for_each_present_cpu(cpu)
  76                                 seq_printf(p, "%10u ", kstat_irqs_cpu(i, cpu));
  77                         seq_printf(p, " %10s",
  78                                    irq_desc[i].irq_data.chip->name ? : "-");
  79                         seq_printf(p, "  %s", action->name);
  80                         for (action = action->next;
  81                              action;
  82                              action = action->next)
  83                                 seq_printf(p, ", %s", action->name);
  84
  85                         seq_putc(p, '\n');
  86                 }
  87
  88                 raw_spin_unlock_irqrestore(&irq_desc[i].lock, flags);
  89         } else if (i == NR_IRQS) {
  90                 seq_printf(p, "Err: %10u\n", atomic_read(&irq_err_count));
  91         }
  92
  93         return 0;
  94 }
  95
  96 /*
  97  * on-CPU PIC operations
  98  */
  99 static void frv_cpupic_ack(struct irq_data *d)
 100 {
 101         __clr_RC(d->irq);
 102         __clr_IRL();
 103 }
 104
 105 static void frv_cpupic_mask(struct irq_data *d)
 106 {
 107         __set_MASK(d->irq);
 108 }
 109
 110 static void frv_cpupic_mask_ack(struct irq_data *d)
 111 {
 112         __set_MASK(d->irq);
 113         __clr_RC(d->irq);
 114         __clr_IRL();
 115 }
 116
 117 static void frv_cpupic_unmask(struct irq_data *d)
 118 {
 119         __clr_MASK(d->irq);
 120 }
 121
 122 static struct irq_chip frv_cpu_pic = {
 123         .name           = "cpu",
 124         .irq_ack        = frv_cpupic_ack,
 125         .irq_mask       = frv_cpupic_mask,
 126         .irq_mask_ack   = frv_cpupic_mask_ack,
 127         .irq_unmask     = frv_cpupic_unmask,
 128 };
 129
 130 /*
 131  * handles all normal device IRQs
 132  * - registers are referred to by the __frame variable (GR28)
 133  * - IRQ distribution is complicated in this arch because of the many PICs, the
 134  *   way they work and the way they cascade
 135  */
 136 asmlinkage void do_IRQ(void)
 137 {
 138         irq_enter();
 139         generic_handle_irq(__get_IRL());
 140         irq_exit();
 141 }
 142
 143 /*
 144  * handles all NMIs when not co-opted by the debugger
 145  * - registers are referred to by the __frame variable (GR28)
 146  */
 147 asmlinkage void do_NMI(void)
 148 {
 149 }
 150
 151 /*
 152  * initialise the interrupt system
 153  */
 154 void __init init_IRQ(void)
 155 {
 156         int level;
 157
 158         for (level = 1; level <= 14; level++)
 159                 irq_set_chip_and_handler(level, &frv_cpu_pic,
 160                                          handle_level_irq);
 161
 162         irq_set_handler(IRQ_CPU_TIMER0, handle_edge_irq);
 163
 164         /* set the trigger levels for internal interrupt sources
 165          * - timers all falling-edge
 166          * - ERR0 is rising-edge
 167          * - all others are high-level
 168          */
 169         __set_IITMR(0, 0x003f0000);     /* DMA0-3, TIMER0-2 */
 170         __set_IITMR(1, 0x20000000);     /* ERR0-1, UART0-1, DMA4-7 */
 171
 172         /* route internal interrupts */
 173         set_IRR(4, IRQ_DMA3_LEVEL, IRQ_DMA2_LEVEL, IRQ_DMA1_LEVEL,
 174                 IRQ_DMA0_LEVEL);
 175         set_IRR(5, 0, IRQ_TIMER2_LEVEL, IRQ_TIMER1_LEVEL, IRQ_TIMER0_LEVEL);
 176         set_IRR(6, IRQ_GDBSTUB_LEVEL, IRQ_GDBSTUB_LEVEL,
 177                 IRQ_UART1_LEVEL, IRQ_UART0_LEVEL);
 178         set_IRR(7, IRQ_DMA7_LEVEL, IRQ_DMA6_LEVEL, IRQ_DMA5_LEVEL,
 179                 IRQ_DMA4_LEVEL);
 180
 181         /* route external interrupts */
 182         set_IRR(2, IRQ_XIRQ7_LEVEL, IRQ_XIRQ6_LEVEL, IRQ_XIRQ5_LEVEL,
 183                 IRQ_XIRQ4_LEVEL);
 184         set_IRR(3, IRQ_XIRQ3_LEVEL, IRQ_XIRQ2_LEVEL, IRQ_XIRQ1_LEVEL,
 185                 IRQ_XIRQ0_LEVEL);
 186
 187 #if defined(CONFIG_MB93091_VDK)
 188         __set_TM1(0x55550000);          /* XIRQ7-0 all active low */
 189 #elif defined(CONFIG_MB93093_PDK)
 190         __set_TM1(0x15550000);          /* XIRQ7 active high, 6-0 all active low */
 191 #else
 192 #error dont know external IRQ trigger levels for this setup
 193 #endif
 194
 195         fpga_init();
 196 #ifdef CONFIG_FUJITSU_MB93493
 197         mb93493_init();
 198 #endif
 199 }