arch/mips/au1000/csb250/init.c

   1 /*
   2  *
   3  * BRIEF MODULE DESCRIPTION
   4  *      Cogent CSB250 board setup
   5  *
   6  * Copyright 2002 Cogent Computer Systems, Inc.
   7  *      dan@embeddededge.com
   8  *
   9  *  This program is free software; you can redistribute  it and/or modify it
  10  *  under  the terms of  the GNU General  Public License as published by the
  11  *  Free Software Foundation;  either version 2 of the  License, or (at your
  12  *  option) any later version.
  13  *
  14  *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
  15  *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
  16  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  17  *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
  18  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  19  *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
  20  *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  21  *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
  22  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  23  *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  *
  25  *  You should have received a copy of the  GNU General Public License along
  26  *  with this program; if not, write  to the Free Software Foundation, Inc.,
  27  *  675 Mass Ave, Cambridge, MA 02139, USA.
  28  */
  29
  30 #include <linux/init.h>
  31 #include <linux/mm.h>
  32 #include <linux/sched.h>
  33 #include <linux/bootmem.h>
  34 #include <asm/addrspace.h>
  35 #include <asm/bootinfo.h>
  36 #include <linux/string.h>
  37 #include <linux/kernel.h>
  38 #include <linux/sched.h>
  39
  40 int prom_argc;
  41 char **prom_argv, **prom_envp;
  42 extern void  __init prom_init_cmdline(void);
  43 extern char *prom_getenv(char *envname);
  44
  45 /* When we get initrd working someday.........
  46 */
  47 int     my_initrd_start, my_initrd_size;
  48
  49 /* Start arguments and environment.
  50 */
  51 static char     *csb_env[2];
  52 static char     *csb_arg[4];
  53 static char     *arg1 = "console=ttyS3,38400";
  54 static char     *arg2 = "root=/dev/nfs rw ip=any";
  55 static char     *env1 = "ethaddr=00:30:23:50:00:00";
  56
  57 const char *get_system_type(void)
  58 {
  59         return "Cogent CSB250";
  60 }
  61
  62 int __init prom_init(int argc, char **argv, char **envp, int *prom_vec)
  63 {
  64         unsigned char *memsize_str;
  65         unsigned long memsize;
  66
  67         /* We use a0 and a1 to pass initrd start and size.
  68         */
  69         if (((uint) argc > 0) && ((uint)argv > 0)) {
  70                 my_initrd_start = (uint)argc;
  71                 my_initrd_size = (uint)argv;
  72         }
  73
  74         /* First argv is ignored.
  75         */
  76         prom_argc = 3;
  77         prom_argv = csb_arg;
  78         prom_envp = csb_env;
  79         csb_arg[1] = arg1;
  80         csb_arg[2] = arg2;
  81         csb_env[0] = env1;
  82
  83         mips_machgroup = MACH_GROUP_ALCHEMY;
  84         mips_machtype = MACH_CSB250;
  85
  86         prom_init_cmdline();
  87         memsize_str = prom_getenv("memsize");
  88         if (!memsize_str) {
  89                 memsize = 0x02000000;
  90         } else {
  91                 memsize = simple_strtol(memsize_str, NULL, 0);
  92         }
  93         add_memory_region(0, memsize, BOOT_MEM_RAM);
  94         return 0;
  95 }