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 <command.h>
  34 #include <irq_func.h>
  35 #include <asm/interrupt.h>
  36
  37 #if !CONFIG_IS_ENABLED(X86_64)
  38
  39 struct irq_action {
  40         interrupt_handler_t *handler;
  41         void *arg;
  42         unsigned int count;
  43 };
  44
  45 static struct irq_action irq_handlers[SYS_NUM_IRQS] = { {0} };
  46 static int spurious_irq_cnt;
  47 static int spurious_irq;
  48
  49 void irq_install_handler(int irq, interrupt_handler_t *handler, void *arg)
  50 {
  51         int status;
  52
  53         if (irq < 0 || irq >= SYS_NUM_IRQS) {
  54                 printf("irq_install_handler: bad irq number %d\n", irq);
  55                 return;
  56         }
  57
  58         if (irq_handlers[irq].handler != NULL)
  59                 printf("irq_install_handler: 0x%08lx replacing 0x%08lx\n",
  60                                 (ulong) handler,
  61                                 (ulong) irq_handlers[irq].handler);
  62
  63         status = disable_interrupts();
  64
  65         irq_handlers[irq].handler = handler;
  66         irq_handlers[irq].arg = arg;
  67         irq_handlers[irq].count = 0;
  68
  69         if (CONFIG_IS_ENABLED(I8259_PIC))
  70                 unmask_irq(irq);
  71
  72         if (status)
  73                 enable_interrupts();
  74
  75         return;
  76 }
  77
  78 void irq_free_handler(int irq)
  79 {
  80         int status;
  81
  82         if (irq < 0 || irq >= SYS_NUM_IRQS) {
  83                 printf("irq_free_handler: bad irq number %d\n", irq);
  84                 return;
  85         }
  86
  87         status = disable_interrupts();
  88
  89         if (CONFIG_IS_ENABLED(I8259_PIC))
  90                 mask_irq(irq);
  91
  92         irq_handlers[irq].handler = NULL;
  93         irq_handlers[irq].arg = NULL;
  94
  95         if (status)
  96                 enable_interrupts();
  97
  98         return;
  99 }
 100
 101 void do_irq(int hw_irq)
 102 {
 103         int irq = hw_irq - 0x20;
 104
 105         if (irq < 0 || irq >= SYS_NUM_IRQS) {
 106                 printf("do_irq: bad irq number %d\n", irq);
 107                 return;
 108         }
 109
 110         if (irq_handlers[irq].handler) {
 111                 if (CONFIG_IS_ENABLED(I8259_PIC))
 112                         mask_irq(irq);
 113
 114                 irq_handlers[irq].handler(irq_handlers[irq].arg);
 115                 irq_handlers[irq].count++;
 116
 117                 if (CONFIG_IS_ENABLED(I8259_PIC)) {
 118                         unmask_irq(irq);
 119                         specific_eoi(irq);
 120                 }
 121         } else {
 122                 if ((irq & 7) != 7) {
 123                         spurious_irq_cnt++;
 124                         spurious_irq = irq;
 125                 }
 126         }
 127 }
 128 #endif
 129
 130 #if defined(CONFIG_CMD_IRQ)
 131 int do_irqinfo(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 132 {
 133 #if !CONFIG_IS_ENABLED(X86_64)
 134         int irq;
 135
 136         printf("Spurious IRQ: %u, last unknown IRQ: %d\n",
 137                         spurious_irq_cnt, spurious_irq);
 138
 139         printf("Interrupt-Information:\n");
 140         printf("Nr  Routine   Arg       Count\n");
 141
 142         for (irq = 0; irq < SYS_NUM_IRQS; irq++) {
 143                 if (irq_handlers[irq].handler != NULL) {
 144                         printf("%02d  %08lx  %08lx  %d\n",
 145                                         irq,
 146                                         (ulong)irq_handlers[irq].handler,
 147                                         (ulong)irq_handlers[irq].arg,
 148                                         irq_handlers[irq].count);
 149                 }
 150         }
 151 #endif
 152
 153         return 0;
 154 }
 155 #endif