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

   1 /*
   2  * (C) Copyright 2001
   3  * Josh Huber <huber@mclx.com>, Mission Critical Linux, Inc.
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 /*
  25  * interrupts.c - just enough support for the decrementer/timer
  26  */
  27
  28 #include <common.h>
  29 #include <mpc8xx.h>
  30 #include <mpc8xx_irq.h>
  31 #include <asm/processor.h>
  32 #include <commproc.h>
  33 #include <command.h>
  34
  35 int interrupt_init_cpu (unsigned *decrementer_count)
  36 {
  37 #if defined(DEBUG) && !defined(CONFIG_AMIGAONEG3SE)
  38         printf("interrupt_init: GT main cause reg: %08x:%08x\n",
  39                GTREGREAD(LOW_INTERRUPT_CAUSE_REGISTER),
  40                GTREGREAD(HIGH_INTERRUPT_CAUSE_REGISTER));
  41         printf("interrupt_init: ethernet cause regs: %08x %08x %08x\n",
  42                GTREGREAD(ETHERNET0_INTERRUPT_CAUSE_REGISTER),
  43                GTREGREAD(ETHERNET1_INTERRUPT_CAUSE_REGISTER),
  44                GTREGREAD(ETHERNET2_INTERRUPT_CAUSE_REGISTER));
  45         printf("interrupt_init: ethernet mask regs:  %08x %08x %08x\n",
  46                GTREGREAD(ETHERNET0_INTERRUPT_MASK_REGISTER),
  47                GTREGREAD(ETHERNET1_INTERRUPT_MASK_REGISTER),
  48                GTREGREAD(ETHERNET2_INTERRUPT_MASK_REGISTER));
  49         puts("interrupt_init: setting decrementer_count\n");
  50 #endif
  51         *decrementer_count = get_tbclk() / CONFIG_SYS_HZ;
  52
  53         return (0);
  54 }
  55
  56 /****************************************************************************/
  57
  58 /*
  59  * Handle external interrupts
  60  */
  61 void
  62 external_interrupt(struct pt_regs *regs)
  63 {
  64         puts("external_interrupt (oops!)\n");
  65 }
  66
  67 volatile ulong timestamp = 0;
  68
  69 /*
  70  * timer_interrupt - gets called when the decrementer overflows,
  71  * with interrupts disabled.
  72  * Trivial implementation - no need to be really accurate.
  73  */
  74 void
  75 timer_interrupt_cpu (struct pt_regs *regs)
  76 {
  77         /* nothing to do here */
  78         return;
  79 }
  80
  81 /****************************************************************************/
  82
  83 /*
  84  * Install and free a interrupt handler.
  85  */
  86
  87 void
  88 irq_install_handler(int vec, interrupt_handler_t *handler, void *arg)
  89 {
  90
  91 }
  92
  93 void
  94 irq_free_handler(int vec)
  95 {
  96
  97 }
  98
  99 /****************************************************************************/
 100
 101 void
 102 do_irqinfo(cmd_tbl_t *cmdtp, bd_t *bd, int flag, int argc, char *argv[])
 103 {
 104         puts("IRQ related functions are unimplemented currently.\n");
 105 }