arch/powerpc/cpu/74xx_7xx/interrupts.c

   1 /*
   2  * (C) Copyright 2001
   3  * Josh Huber <huber@mclx.com>, Mission Critical Linux, Inc.
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 /*
   9  * interrupts.c - just enough support for the decrementer/timer
  10  */
  11
  12 #include <common.h>
  13 #include <mpc8xx.h>
  14 #include <mpc8xx_irq.h>
  15 #include <asm/processor.h>
  16 #include <commproc.h>
  17 #include <command.h>
  18
  19 int interrupt_init_cpu (unsigned *decrementer_count)
  20 {
  21         debug("interrupt_init: GT main cause reg: %08x:%08x\n",
  22                GTREGREAD(LOW_INTERRUPT_CAUSE_REGISTER),
  23                GTREGREAD(HIGH_INTERRUPT_CAUSE_REGISTER));
  24         debug("interrupt_init: ethernet cause regs: %08x %08x %08x\n",
  25                GTREGREAD(ETHERNET0_INTERRUPT_CAUSE_REGISTER),
  26                GTREGREAD(ETHERNET1_INTERRUPT_CAUSE_REGISTER),
  27                GTREGREAD(ETHERNET2_INTERRUPT_CAUSE_REGISTER));
  28         debug("interrupt_init: ethernet mask regs:  %08x %08x %08x\n",
  29                GTREGREAD(ETHERNET0_INTERRUPT_MASK_REGISTER),
  30                GTREGREAD(ETHERNET1_INTERRUPT_MASK_REGISTER),
  31                GTREGREAD(ETHERNET2_INTERRUPT_MASK_REGISTER));
  32         debug("interrupt_init: setting decrementer_count\n");
  33
  34         *decrementer_count = get_tbclk() / CONFIG_SYS_HZ;
  35
  36         return (0);
  37 }
  38
  39 /****************************************************************************/
  40
  41 /*
  42  * Handle external interrupts
  43  */
  44 void
  45 external_interrupt(struct pt_regs *regs)
  46 {
  47         puts("external_interrupt (oops!)\n");
  48 }
  49
  50 volatile ulong timestamp = 0;
  51
  52 /*
  53  * timer_interrupt - gets called when the decrementer overflows,
  54  * with interrupts disabled.
  55  * Trivial implementation - no need to be really accurate.
  56  */
  57 void
  58 timer_interrupt_cpu (struct pt_regs *regs)
  59 {
  60         /* nothing to do here */
  61         return;
  62 }
  63
  64 /****************************************************************************/
  65
  66 /*
  67  * Install and free a interrupt handler.
  68  */
  69
  70 void
  71 irq_install_handler(int vec, interrupt_handler_t *handler, void *arg)
  72 {
  73
  74 }
  75
  76 void
  77 irq_free_handler(int vec)
  78 {
  79
  80 }
  81
  82 /****************************************************************************/
  83
  84 void
  85 do_irqinfo(cmd_tbl_t *cmdtp, bd_t *bd, int flag, int argc, char * const argv[])
  86 {
  87         puts("IRQ related functions are unimplemented currently.\n");
  88 }