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/slab.h>
  20 #include <linux/random.h>
  21 #include <linux/init.h>
  22 #include <linux/kernel_stat.h>
  23 #include <linux/irq.h>
  24 #include <linux/proc_fs.h>
  25 #include <linux/seq_file.h>
  26 #include <linux/module.h>
  27 #include <linux/bitops.h>
  28
  29 #include <asm/atomic.h>
  30 #include <asm/io.h>
  31 #include <asm/smp.h>
  32 #include <asm/system.h>
  33 #include <asm/uaccess.h>
  34 #include <asm/pgalloc.h>
  35 #include <asm/delay.h>
  36 #include <asm/irq.h>
  37 #include <asm/irc-regs.h>
  38 #include <asm/gdb-stub.h>
  39
  40 #define set_IRR(N,A,B,C,D) __set_IRR(N, (A << 28) | (B << 24) | (C << 20) | (D << 16))
  41
  42 extern void __init fpga_init(void);
  43 #ifdef CONFIG_FUJITSU_MB93493
  44 extern void __init mb93493_init(void);
  45 #endif
  46
  47 #define __reg16(ADDR) (*(volatile unsigned short *)(ADDR))
  48
  49 atomic_t irq_err_count;
  50
  51 /*
  52  * Generic, controller-independent functions:
  53  */
  54 int show_interrupts(struct seq_file *p, void *v)
  55 {
  56         int i = *(loff_t *) v, cpu;
  57         struct irqaction * action;
  58         unsigned long flags;
  59
  60         if (i == 0) {
  61                 char cpuname[12];
  62
  63                 seq_printf(p, "    ");
  64                 for_each_present_cpu(cpu) {
  65                         sprintf(cpuname, "CPU%d", cpu);
  66                         seq_printf(p, " %10s", cpuname);
  67                 }
  68                 seq_putc(p, '\n');
  69         }
  70
  71         if (i < NR_IRQS) {
  72                 spin_lock_irqsave(&irq_desc[i].lock, flags);
  73                 action = irq_desc[i].action;
  74                 if (action) {
  75                         seq_printf(p, "%3d: ", i);
  76                         for_each_present_cpu(cpu)
  77                                 seq_printf(p, "%10u ", kstat_irqs_cpu(i, cpu));
  78                         seq_printf(p, " %10s", irq_desc[i].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                 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(unsigned int irqlevel)
 100 {
 101         __clr_RC(irqlevel);
 102         __clr_IRL();
 103 }
 104
 105 static void frv_cpupic_mask(unsigned int irqlevel)
 106 {
 107         __set_MASK(irqlevel);
 108 }
 109
 110 static void frv_cpupic_mask_ack(unsigned int irqlevel)
 111 {
 112         __set_MASK(irqlevel);
 113         __clr_RC(irqlevel);
 114         __clr_IRL();
 115 }
 116
 117 static void frv_cpupic_unmask(unsigned int irqlevel)
 118 {
 119         __clr_MASK(irqlevel);
 120 }
 121
 122 static void frv_cpupic_end(unsigned int irqlevel)
 123 {
 124         __clr_MASK(irqlevel);
 125 }
 126
 127 static struct irq_chip frv_cpu_pic = {
 128         .name           = "cpu",
 129         .ack            = frv_cpupic_ack,
 130         .mask           = frv_cpupic_mask,
 131         .mask_ack       = frv_cpupic_mask_ack,
 132         .unmask         = frv_cpupic_unmask,
 133         .end            = frv_cpupic_end,
 134 };
 135
 136 /*
 137  * handles all normal device IRQs
 138  * - registers are referred to by the __frame variable (GR28)
 139  * - IRQ distribution is complicated in this arch because of the many PICs, the
 140  *   way they work and the way they cascade
 141  */
 142 asmlinkage void do_IRQ(void)
 143 {
 144         irq_enter();
 145         generic_handle_irq(__get_IRL());
 146         irq_exit();
 147 }
 148
 149 /*
 150  * handles all NMIs when not co-opted by the debugger
 151  * - registers are referred to by the __frame variable (GR28)
 152  */
 153 asmlinkage void do_NMI(void)
 154 {
 155 }
 156
 157 /*
 158  * initialise the interrupt system
 159  */
 160 void __init init_IRQ(void)
 161 {
 162         int level;
 163
 164         for (level = 1; level <= 14; level++)
 165                 set_irq_chip_and_handler(level, &frv_cpu_pic,
 166                                          handle_level_irq);
 167
 168         set_irq_handler(IRQ_CPU_TIMER0, handle_edge_irq);
 169
 170         /* set the trigger levels for internal interrupt sources
 171          * - timers all falling-edge
 172          * - ERR0 is rising-edge
 173          * - all others are high-level
 174          */
 175         __set_IITMR(0, 0x003f0000);     /* DMA0-3, TIMER0-2 */
 176         __set_IITMR(1, 0x20000000);     /* ERR0-1, UART0-1, DMA4-7 */
 177
 178         /* route internal interrupts */
 179         set_IRR(4, IRQ_DMA3_LEVEL, IRQ_DMA2_LEVEL, IRQ_DMA1_LEVEL,
 180                 IRQ_DMA0_LEVEL);
 181         set_IRR(5, 0, IRQ_TIMER2_LEVEL, IRQ_TIMER1_LEVEL, IRQ_TIMER0_LEVEL);
 182         set_IRR(6, IRQ_GDBSTUB_LEVEL, IRQ_GDBSTUB_LEVEL,
 183                 IRQ_UART1_LEVEL, IRQ_UART0_LEVEL);
 184         set_IRR(7, IRQ_DMA7_LEVEL, IRQ_DMA6_LEVEL, IRQ_DMA5_LEVEL,
 185                 IRQ_DMA4_LEVEL);
 186
 187         /* route external interrupts */
 188         set_IRR(2, IRQ_XIRQ7_LEVEL, IRQ_XIRQ6_LEVEL, IRQ_XIRQ5_LEVEL,
 189                 IRQ_XIRQ4_LEVEL);
 190         set_IRR(3, IRQ_XIRQ3_LEVEL, IRQ_XIRQ2_LEVEL, IRQ_XIRQ1_LEVEL,
 191                 IRQ_XIRQ0_LEVEL);
 192
 193 #if defined(CONFIG_MB93091_VDK)
 194         __set_TM1(0x55550000);          /* XIRQ7-0 all active low */
 195 #elif defined(CONFIG_MB93093_PDK)
 196         __set_TM1(0x15550000);          /* XIRQ7 active high, 6-0 all active low */
 197 #else
 198 #error dont know external IRQ trigger levels for this setup
 199 #endif
 200
 201         fpga_init();
 202 #ifdef CONFIG_FUJITSU_MB93493
 203         mb93493_init();
 204 #endif
 205 }