arch/mips/vr41xx/common/init.c

   1 /*
   2  *  init.c, Common initialization routines for NEC VR4100 series.
   3  *
   4  *  Copyright (C) 2003-2005  Yoichi Yuasa <yuasa@hh.iij4u.or.jp>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20 #include <linux/init.h>
  21 #include <linux/ioport.h>
  22 #include <linux/irq.h>
  23 #include <linux/string.h>
  24
  25 #include <asm/bootinfo.h>
  26 #include <asm/time.h>
  27 #include <asm/vr41xx/vr41xx.h>
  28
  29 #define IO_MEM_RESOURCE_START   0UL
  30 #define IO_MEM_RESOURCE_END     0x1fffffffUL
  31
  32 static void __init iomem_resource_init(void)
  33 {
  34         iomem_resource.start = IO_MEM_RESOURCE_START;
  35         iomem_resource.end = IO_MEM_RESOURCE_END;
  36 }
  37
  38 static void __init setup_timer_frequency(void)
  39 {
  40         unsigned long tclock;
  41
  42         tclock = vr41xx_get_tclock_frequency();
  43         if (current_cpu_data.processor_id == PRID_VR4131_REV2_0 ||
  44             current_cpu_data.processor_id == PRID_VR4131_REV2_1)
  45                 mips_hpt_frequency = tclock / 2;
  46         else
  47                 mips_hpt_frequency = tclock / 4;
  48 }
  49
  50 static void __init setup_timer_irq(struct irqaction *irq)
  51 {
  52         setup_irq(TIMER_IRQ, irq);
  53 }
  54
  55 static void __init timer_init(void)
  56 {
  57         board_time_init = setup_timer_frequency;
  58         board_timer_setup = setup_timer_irq;
  59 }
  60
  61 void __init prom_init(void)
  62 {
  63         int argc, i;
  64         char **argv;
  65
  66         argc = fw_arg0;
  67         argv = (char **)fw_arg1;
  68
  69         for (i = 1; i < argc; i++) {
  70                 strcat(arcs_cmdline, argv[i]);
  71                 if (i < (argc - 1))
  72                         strcat(arcs_cmdline, " ");
  73         }
  74
  75         vr41xx_calculate_clock_frequency();
  76
  77         timer_init();
  78
  79         iomem_resource_init();
  80 }
  81
  82 unsigned long __init prom_free_prom_memory (void)
  83 {
  84         return 0UL;
  85 }