LXR uboot/arch/powerpc/cpu/74xx

   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
  35int interrupt_init_cpu (unsigned *decrementer_count)
  36{
  37        debug("interrupt_init: GT main cause reg: %08x:%08x\n",
  38               GTREGREAD(LOW_INTERRUPT_CAUSE_REGISTER),
  39               GTREGREAD(HIGH_INTERRUPT_CAUSE_REGISTER));
  40        debug("interrupt_init: ethernet cause regs: %08x %08x %08x\n",
  41               GTREGREAD(ETHERNET0_INTERRUPT_CAUSE_REGISTER),
  42               GTREGREAD(ETHERNET1_INTERRUPT_CAUSE_REGISTER),
  43               GTREGREAD(ETHERNET2_INTERRUPT_CAUSE_REGISTER));
  44        debug("interrupt_init: ethernet mask regs:  %08x %08x %08x\n",
  45               GTREGREAD(ETHERNET0_INTERRUPT_MASK_REGISTER),
  46               GTREGREAD(ETHERNET1_INTERRUPT_MASK_REGISTER),
  47               GTREGREAD(ETHERNET2_INTERRUPT_MASK_REGISTER));
  48        debug("interrupt_init: setting decrementer_count\n");
  49
  50        *decrementer_count = get_tbclk() / CONFIG_SYS_HZ;
  51
  52        return (0);
  53}
  54
  55/****************************************************************************/
  56
  57/*
  58 * Handle external interrupts
  59 */
  60void
  61external_interrupt(struct pt_regs *regs)
  62{
  63        puts("external_interrupt (oops!)\n");
  64}
  65
  66volatile ulong timestamp = 0;
  67
  68/*
  69 * timer_interrupt - gets called when the decrementer overflows,
  70 * with interrupts disabled.
  71 * Trivial implementation - no need to be really accurate.
  72 */
  73void
  74timer_interrupt_cpu (struct pt_regs *regs)
  75{
  76        /* nothing to do here */
  77        return;
  78}
  79
  80/****************************************************************************/
  81
  82/*
  83 * Install and free a interrupt handler.
  84 */
  85
  86void
  87irq_install_handler(int vec, interrupt_handler_t *handler, void *arg)
  88{
  89
  90}
  91
  92void
  93irq_free_handler(int vec)
  94{
  95
  96}
  97
  98/****************************************************************************/
  99
 100void
 101do_irqinfo(cmd_tbl_t *cmdtp, bd_t *bd, int flag, int argc, char * const argv[])
 102{
 103        puts("IRQ related functions are unimplemented currently.\n");
 104}
 105