git.sur5r.net Git - u-boot/blob - 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 #if !CONFIG_IS_ENABLED(X86_64)
  37
  38 struct irq_action {
  39         interrupt_handler_t *handler;
  40         void *arg;
  41         unsigned int count;
  42 };
  43
  44 static struct irq_action irq_handlers[SYS_NUM_IRQS] = { {0} };
  45 static int spurious_irq_cnt;
  46 static int spurious_irq;
  47
  48 void irq_install_handler(int irq, interrupt_handler_t *handler, void *arg)
  49 {
  50         int status;
  51
  52         if (irq < 0 || irq >= SYS_NUM_IRQS) {
  53                 printf("irq_install_handler: bad irq number %d\n", irq);
  54                 return;
  55         }
  56
  57         if (irq_handlers[irq].handler != NULL)
  58                 printf("irq_install_handler: 0x%08lx replacing 0x%08lx\n",
  59                                 (ulong) handler,
  60                                 (ulong) irq_handlers[irq].handler);
  61
  62         status = disable_interrupts();
  63
  64         irq_handlers[irq].handler = handler;
  65         irq_handlers[irq].arg = arg;
  66         irq_handlers[irq].count = 0;
  67
  68         unmask_irq(irq);
  69
  70         if (status)
  71                 enable_interrupts();
  72
  73         return;
  74 }
  75
  76 void irq_free_handler(int irq)
  77 {
  78         int status;
  79
  80         if (irq < 0 || irq >= SYS_NUM_IRQS) {
  81                 printf("irq_free_handler: bad irq number %d\n", irq);
  82                 return;
  83         }
  84
  85         status = disable_interrupts();
  86
  87         mask_irq(irq);
  88
  89         irq_handlers[irq].handler = NULL;
  90         irq_handlers[irq].arg = NULL;
  91
  92         if (status)
  93                 enable_interrupts();
  94
  95         return;
  96 }
  97
  98 void do_irq(int hw_irq)
  99 {
 100         int irq = hw_irq - 0x20;
 101
 102         if (irq < 0 || irq >= SYS_NUM_IRQS) {
 103                 printf("do_irq: bad irq number %d\n", irq);
 104                 return;
 105         }
 106
 107         if (irq_handlers[irq].handler) {
 108                 mask_irq(irq);
 109
 110                 irq_handlers[irq].handler(irq_handlers[irq].arg);
 111                 irq_handlers[irq].count++;
 112
 113                 unmask_irq(irq);
 114                 specific_eoi(irq);
 115
 116         } else {
 117                 if ((irq & 7) != 7) {
 118                         spurious_irq_cnt++;
 119                         spurious_irq = irq;
 120                 }
 121         }
 122 }
 123 #endif
 124
 125 #if defined(CONFIG_CMD_IRQ)
 126 int do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 127 {
 128 #if !CONFIG_IS_ENABLED(X86_64)
 129         int irq;
 130
 131         printf("Spurious IRQ: %u, last unknown IRQ: %d\n",
 132                         spurious_irq_cnt, spurious_irq);
 133
 134         printf("Interrupt-Information:\n");
 135         printf("Nr  Routine   Arg       Count\n");
 136
 137         for (irq = 0; irq < SYS_NUM_IRQS; irq++) {
 138                 if (irq_handlers[irq].handler != NULL) {
 139                         printf("%02d  %08lx  %08lx  %d\n",
 140                                         irq,
 141                                         (ulong)irq_handlers[irq].handler,
 142                                         (ulong)irq_handlers[irq].arg,
 143                                         irq_handlers[irq].count);
 144                 }
 145         }
 146 #endif
 147
 148         return 0;
 149 }
 150 #endif