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 <asm/interrupt.h>
  34
  35 #if !CONFIG_IS_ENABLED(X86_64)
  36
  37 struct irq_action {
  38         interrupt_handler_t *handler;
  39         void *arg;
  40         unsigned int count;
  41 };
  42
  43 static struct irq_action irq_handlers[SYS_NUM_IRQS] = { {0} };
  44 static int spurious_irq_cnt;
  45 static int spurious_irq;
  46
  47 void irq_install_handler(int irq, interrupt_handler_t *handler, void *arg)
  48 {
  49         int status;
  50
  51         if (irq < 0 || irq >= SYS_NUM_IRQS) {
  52                 printf("irq_install_handler: bad irq number %d\n", irq);
  53                 return;
  54         }
  55
  56         if (irq_handlers[irq].handler != NULL)
  57                 printf("irq_install_handler: 0x%08lx replacing 0x%08lx\n",
  58                                 (ulong) handler,
  59                                 (ulong) irq_handlers[irq].handler);
  60
  61         status = disable_interrupts();
  62
  63         irq_handlers[irq].handler = handler;
  64         irq_handlers[irq].arg = arg;
  65         irq_handlers[irq].count = 0;
  66
  67         if (CONFIG_IS_ENABLED(I8259_PIC))
  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         if (CONFIG_IS_ENABLED(I8259_PIC))
  88                 mask_irq(irq);
  89
  90         irq_handlers[irq].handler = NULL;
  91         irq_handlers[irq].arg = NULL;
  92
  93         if (status)
  94                 enable_interrupts();
  95
  96         return;
  97 }
  98
  99 void do_irq(int hw_irq)
 100 {
 101         int irq = hw_irq - 0x20;
 102
 103         if (irq < 0 || irq >= SYS_NUM_IRQS) {
 104                 printf("do_irq: bad irq number %d\n", irq);
 105                 return;
 106         }
 107
 108         if (irq_handlers[irq].handler) {
 109                 if (CONFIG_IS_ENABLED(I8259_PIC))
 110                         mask_irq(irq);
 111
 112                 irq_handlers[irq].handler(irq_handlers[irq].arg);
 113                 irq_handlers[irq].count++;
 114
 115                 if (CONFIG_IS_ENABLED(I8259_PIC)) {
 116                         unmask_irq(irq);
 117                         specific_eoi(irq);
 118                 }
 119         } else {
 120                 if ((irq & 7) != 7) {
 121                         spurious_irq_cnt++;
 122                         spurious_irq = irq;
 123                 }
 124         }
 125 }
 126 #endif
 127
 128 #if defined(CONFIG_CMD_IRQ)
 129 int do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 130 {
 131 #if !CONFIG_IS_ENABLED(X86_64)
 132         int irq;
 133
 134         printf("Spurious IRQ: %u, last unknown IRQ: %d\n",
 135                         spurious_irq_cnt, spurious_irq);
 136
 137         printf("Interrupt-Information:\n");
 138         printf("Nr  Routine   Arg       Count\n");
 139
 140         for (irq = 0; irq < SYS_NUM_IRQS; irq++) {
 141                 if (irq_handlers[irq].handler != NULL) {
 142                         printf("%02d  %08lx  %08lx  %d\n",
 143                                         irq,
 144                                         (ulong)irq_handlers[irq].handler,
 145                                         (ulong)irq_handlers[irq].arg,
 146                                         irq_handlers[irq].count);
 147                 }
 148         }
 149 #endif
 150
 151         return 0;
 152 }
 153 #endif