arch/x86/lib/interrupts.c

   1 /*
   2  * (C) Copyright 2009
   3  * Graeme Russ, <graeme.russ@gmail.com>
   4  *
   5  * (C) Copyright 2007
   6  * Daniel Hellstrom, Gaisler Research, <daniel@gaisler.com>
   7  *
   8  * (C) Copyright 2006
   9  * Detlev Zundel, DENX Software Engineering, <dzu@denx.de>
  10  *
  11  * (C) Copyright -2003
  12  * Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
  13  *
  14  * (C) Copyright 2002
  15  * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
  16  *
  17  * (C) Copyright 2001
  18  * Josh Huber, Mission Critical Linux, Inc, <huber@mclx.com>
  19  *
  20  * SPDX-License-Identifier:     GPL-2.0+
  21  */
  22
  23 /*
  24  * This file contains the high-level API for the interrupt sub-system
  25  * of the x86 port of U-Boot. Most of the functionality has been
  26  * shamelessly stolen from the leon2 / leon3 ports of U-Boot.
  27  * Daniel Hellstrom, Detlev Zundel, Wolfgang Denk and Josh Huber are
  28  * credited for the corresponding work on those ports. The original
  29  * interrupt handling routines for the x86 port were written by
  30  * Daniel Engström
  31  */
  32
  33 #include <common.h>
  34 #include <asm/interrupt.h>
  35
  36 struct irq_action {
  37         interrupt_handler_t *handler;
  38         void *arg;
  39         unsigned int count;
  40 };
  41
  42 static struct irq_action irq_handlers[CONFIG_SYS_NUM_IRQS] = { {0} };
  43 static int spurious_irq_cnt;
  44 static int spurious_irq;
  45
  46 void irq_install_handler(int irq, interrupt_handler_t *handler, void *arg)
  47 {
  48         int status;
  49
  50         if (irq < 0 || irq >= CONFIG_SYS_NUM_IRQS) {
  51                 printf("irq_install_handler: bad irq number %d\n", irq);
  52                 return;
  53         }
  54
  55         if (irq_handlers[irq].handler != NULL)
  56                 printf("irq_install_handler: 0x%08lx replacing 0x%08lx\n",
  57                                 (ulong) handler,
  58                                 (ulong) irq_handlers[irq].handler);
  59
  60         status = disable_interrupts();
  61
  62         irq_handlers[irq].handler = handler;
  63         irq_handlers[irq].arg = arg;
  64         irq_handlers[irq].count = 0;
  65
  66         unmask_irq(irq);
  67
  68         if (status)
  69                 enable_interrupts();
  70
  71         return;
  72 }
  73
  74 void irq_free_handler(int irq)
  75 {
  76         int status;
  77
  78         if (irq < 0 || irq >= CONFIG_SYS_NUM_IRQS) {
  79                 printf("irq_free_handler: bad irq number %d\n", irq);
  80                 return;
  81         }
  82
  83         status = disable_interrupts();
  84
  85         mask_irq(irq);
  86
  87         irq_handlers[irq].handler = NULL;
  88         irq_handlers[irq].arg = NULL;
  89
  90         if (status)
  91                 enable_interrupts();
  92
  93         return;
  94 }
  95
  96 void do_irq(int hw_irq)
  97 {
  98         int irq = hw_irq - 0x20;
  99
 100         if (irq < 0 || irq >= CONFIG_SYS_NUM_IRQS) {
 101                 printf("do_irq: bad irq number %d\n", irq);
 102                 return;
 103         }
 104
 105         if (irq_handlers[irq].handler) {
 106                 mask_irq(irq);
 107
 108                 irq_handlers[irq].handler(irq_handlers[irq].arg);
 109                 irq_handlers[irq].count++;
 110
 111                 unmask_irq(irq);
 112                 specific_eoi(irq);
 113
 114         } else {
 115                 if ((irq & 7) != 7) {
 116                         spurious_irq_cnt++;
 117                         spurious_irq = irq;
 118                 }
 119         }
 120 }
 121
 122 #if defined(CONFIG_CMD_IRQ)
 123 int do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 124 {
 125         int irq;
 126
 127         printf("Spurious IRQ: %u, last unknown IRQ: %d\n",
 128                         spurious_irq_cnt, spurious_irq);
 129
 130         printf("Interrupt-Information:\n");
 131         printf("Nr  Routine   Arg       Count\n");
 132
 133         for (irq = 0; irq <= CONFIG_SYS_NUM_IRQS; irq++) {
 134                 if (irq_handlers[irq].handler != NULL) {
 135                         printf("%02d  %08lx  %08lx  %d\n",
 136                                         irq,
 137                                         (ulong)irq_handlers[irq].handler,
 138                                         (ulong)irq_handlers[irq].arg,
 139                                         irq_handlers[irq].count);
 140                 }
 141         }
 142
 143         return 0;
 144 }
 145 #endif