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