release/src-rt-6.x.4708/linux/linux-2.6.36/arch/mips/alchemy/devboards/prom.c

   1 /*
   2  * Common code used by all Alchemy develboards.
   3  *
   4  * Extracted from files which had this to say:
   5  *
   6  * Copyright 2000, 2008 MontaVista Software Inc.
   7  * Author: MontaVista Software, Inc. <source@mvista.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/kernel.h>
  32 #include <asm/bootinfo.h>
  33 #include <asm/mach-au1x00/au1000.h>
  34 #include <prom.h>
  35
  36 #if defined(CONFIG_MIPS_PB1000) || defined(CONFIG_MIPS_DB1000) || \
  37         defined(CONFIG_MIPS_PB1100) || defined(CONFIG_MIPS_DB1100) || \
  38         defined(CONFIG_MIPS_PB1500) || defined(CONFIG_MIPS_DB1500) || \
  39         defined(CONFIG_MIPS_BOSPORUS) || defined(CONFIG_MIPS_MIRAGE)
  40 #define ALCHEMY_BOARD_DEFAULT_MEMSIZE   0x04000000
  41
  42 #else   /* Au1550/Au1200-based develboards */
  43 #define ALCHEMY_BOARD_DEFAULT_MEMSIZE   0x08000000
  44 #endif
  45
  46 void __init prom_init(void)
  47 {
  48         unsigned char *memsize_str;
  49         unsigned long memsize;
  50
  51         prom_argc = (int)fw_arg0;
  52         prom_argv = (char **)fw_arg1;
  53         prom_envp = (char **)fw_arg2;
  54
  55         prom_init_cmdline();
  56         memsize_str = prom_getenv("memsize");
  57         if (!memsize_str || strict_strtoul(memsize_str, 0, &memsize))
  58                 memsize = ALCHEMY_BOARD_DEFAULT_MEMSIZE;
  59
  60         add_memory_region(0, memsize, BOOT_MEM_RAM);
  61 }
  62
  63 void prom_putchar(unsigned char c)
  64 {
  65     alchemy_uart_putchar(UART0_PHYS_ADDR, c);
  66 }