arch/x86/lib/interrupts.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2009
   4  * Graeme Russ, <graeme.russ@gmail.com>
   5  *
   6  * (C) Copyright 2007
   7  * Daniel Hellstrom, Gaisler Research, <daniel@gaisler.com>
   8  *
   9  * (C) Copyright 2006
  10  * Detlev Zundel, DENX Software Engineering, <dzu@denx.de>
  11  *
  12  * (C) Copyright -2003
  13  * Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
  14  *
  15  * (C) Copyright 2002
  16  * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
  17  *
  18  * (C) Copyright 2001
  19  * Josh Huber, Mission Critical Linux, Inc, <huber@mclx.com>
  20  */
  21
  22 /*
  23  * This file contains the high-level API for the interrupt sub-system
  24  * of the x86 port of U-Boot. Most of the functionality has been
  25  * shamelessly stolen from the leon2 / leon3 ports of U-Boot.
  26  * Daniel Hellstrom, Detlev Zundel, Wolfgang Denk and Josh Huber are
  27  * credited for the corresponding work on those ports. The original
  28  * interrupt handling routines for the x86 port were written by
  29  * Daniel Engström
  30  */
  31
  32 #include <common.h>
  33 #include <irq_func.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         if (CONFIG_IS_ENABLED(I8259_PIC))
  69                 unmask_irq(irq);
  70
  71         if (status)
  72                 enable_interrupts();
  73
  74         return;
  75 }
  76
  77 void irq_free_handler(int irq)
  78 {
  79         int status;
  80
  81         if (irq < 0 || irq >= SYS_NUM_IRQS) {
  82                 printf("irq_free_handler: bad irq number %d\n", irq);
  83                 return;
  84         }
  85
  86         status = disable_interrupts();
  87
  88         if (CONFIG_IS_ENABLED(I8259_PIC))
  89                 mask_irq(irq);
  90
  91         irq_handlers[irq].handler = NULL;
  92         irq_handlers[irq].arg = NULL;
  93
  94         if (status)
  95                 enable_interrupts();
  96
  97         return;
  98 }
  99
 100 void do_irq(int hw_irq)
 101 {
 102         int irq = hw_irq - 0x20;
 103
 104         if (irq < 0 || irq >= SYS_NUM_IRQS) {
 105                 printf("do_irq: bad irq number %d\n", irq);
 106                 return;
 107         }
 108
 109         if (irq_handlers[irq].handler) {
 110                 if (CONFIG_IS_ENABLED(I8259_PIC))
 111                         mask_irq(irq);
 112
 113                 irq_handlers[irq].handler(irq_handlers[irq].arg);
 114                 irq_handlers[irq].count++;
 115
 116                 if (CONFIG_IS_ENABLED(I8259_PIC)) {
 117                         unmask_irq(irq);
 118                         specific_eoi(irq);
 119                 }
 120         } else {
 121                 if ((irq & 7) != 7) {
 122                         spurious_irq_cnt++;
 123                         spurious_irq = irq;
 124                 }
 125         }
 126 }
 127 #endif
 128
 129 #if defined(CONFIG_CMD_IRQ)
 130 int do_irqinfo(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 131 {
 132 #if !CONFIG_IS_ENABLED(X86_64)
 133         int irq;
 134
 135         printf("Spurious IRQ: %u, last unknown IRQ: %d\n",
 136                         spurious_irq_cnt, spurious_irq);
 137
 138         printf("Interrupt-Information:\n");
 139         printf("Nr  Routine   Arg       Count\n");
 140
 141         for (irq = 0; irq < SYS_NUM_IRQS; irq++) {
 142                 if (irq_handlers[irq].handler != NULL) {
 143                         printf("%02d  %08lx  %08lx  %d\n",
 144                                         irq,
 145                                         (ulong)irq_handlers[irq].handler,
 146                                         (ulong)irq_handlers[irq].arg,
 147                                         irq_handlers[irq].count);
 148                 }
 149         }
 150 #endif
 151
 152         return 0;
 153 }
 154 #endif