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
  39 int prom_argc;
  40 char **prom_argv, **prom_envp;
  41 extern void  __init prom_init_cmdline(void);
  42 extern char *prom_getenv(char *envname);
  43
  44 /* When we get initrd working someday.........
  45 */
  46 int     my_initrd_start, my_initrd_size;
  47
  48 /* Start arguments and environment.
  49 */
  50 static char     *csb_env[2];
  51 static char     *csb_arg[4];
  52 static char     *arg1 = "console=ttyS3,38400";
  53 static char     *arg2 = "root=/dev/nfs rw ip=any";
  54 static char     *env1 = "ethaddr=00:30:23:50:00:00";
  55
  56 const char *get_system_type(void)
  57 {
  58         return "Cogent CSB250";
  59 }
  60
  61 int __init prom_init(int argc, char **argv, char **envp, int *prom_vec)
  62 {
  63         unsigned char *memsize_str;
  64         unsigned long memsize;
  65
  66         /* We use a0 and a1 to pass initrd start and size.
  67         */
  68         if (((unsigned int) argc > 0) && ((uint)argv > 0)) {
  69                 my_initrd_start = (unsigned int)argc;
  70                 my_initrd_size = (unsigned int)argv;
  71         }
  72
  73         /* First argv is ignored.
  74         */
  75         prom_argc = 3;
  76         prom_argv = csb_arg;
  77         prom_envp = csb_env;
  78         csb_arg[1] = arg1;
  79         csb_arg[2] = arg2;
  80         csb_env[0] = env1;
  81
  82         mips_machgroup = MACH_GROUP_ALCHEMY;
  83         mips_machtype = MACH_CSB250;
  84
  85         prom_init_cmdline();
  86         memsize_str = prom_getenv("memsize");
  87         if (!memsize_str) {
  88                 memsize = 0x02000000;
  89         } else {
  90                 memsize = simple_strtol(memsize_str, NULL, 0);
  91         }
  92         add_memory_region(0, memsize, BOOT_MEM_RAM);
  93         return 0;
  94 }