target/linux/xburst/files-2.6.32/arch/mips/jz4740/prom.c

   1 /*
   2  *
   3  * BRIEF MODULE DESCRIPTION
   4  *    PROM library initialisation code, supports YAMON and U-Boot.
   5  *
   6  * Copyright 2000, 2001, 2006 MontaVista Software Inc.
   7  * Author: MontaVista Software, Inc.
   8  *              ppopov@mvista.com or source@mvista.com
   9  *
  10  * This file was derived from Carsten Langgaard's
  11  * arch/mips/mips-boards/xx files.
  12  *
  13  * Carsten Langgaard, carstenl@mips.com
  14  * Copyright (C) 1999,2000 MIPS Technologies, Inc.  All rights reserved.
  15  *
  16  *  This program is free software; you can redistribute  it and/or modify it
  17  *  under  the terms of  the GNU General  Public License as published by the
  18  *  Free Software Foundation;  either version 2 of the  License, or (at your
  19  *  option) any later version.
  20  *
  21  *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
  22  *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
  23  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  24  *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
  25  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  26  *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
  27  *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  28  *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
  29  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  30  *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31  *
  32  *  You should have received a copy of the  GNU General Public License along
  33  *  with this program; if not, write  to the Free Software Foundation, Inc.,
  34  *  675 Mass Ave, Cambridge, MA 02139, USA.
  35  */
  36
  37 #include <linux/module.h>
  38 #include <linux/kernel.h>
  39 #include <linux/init.h>
  40 #include <linux/string.h>
  41
  42 #include <asm/bootinfo.h>
  43 #include <asm/mach-jz4740/regs.h>
  44
  45 /* #define DEBUG_CMDLINE */
  46
  47 int prom_argc;
  48 char **prom_argv, **prom_envp;
  49
  50 char *prom_getcmdline(void)
  51 {
  52         return &(arcs_cmdline[0]);
  53 }
  54
  55 void prom_init_cmdline(void)
  56 {
  57         char *cp, *c;
  58         size_t i = 1;
  59
  60         cp = &(arcs_cmdline[0]);
  61         while(i < prom_argc) {
  62                 c = prom_argv[i];
  63                 while (*c) {
  64                         *cp++ = *c++;
  65                 }
  66                 *cp++ = ' ';
  67                 i++;
  68         }
  69         if (i > 1) {
  70                 *(cp - 1) = '\0';
  71         }
  72
  73 }
  74
  75 void __init prom_init(void)
  76 {
  77         unsigned long memsize;
  78
  79         prom_argc = (int) fw_arg0;
  80         prom_argv = (char **) fw_arg1;
  81         prom_envp = (char **) fw_arg2;
  82
  83         mips_machtype = MACH_INGENIC_JZ4740;
  84
  85         prom_init_cmdline();
  86         memsize = 0x04000000;
  87         add_memory_region(0, memsize, BOOT_MEM_RAM);
  88 }
  89
  90 void __init prom_free_prom_memory(void)
  91 {
  92 }
  93
  94 /* used by early printk */
  95 void prom_putchar(char c)
  96 {
  97         volatile u8 *uart_lsr = (volatile u8 *)(UART0_BASE + OFF_LSR);
  98         volatile u8 *uart_tdr = (volatile u8 *)(UART0_BASE + OFF_TDR);
  99
 100         /* Wait for fifo to shift out some bytes */
 101         while ( !((*uart_lsr & (UARTLSR_TDRQ | UARTLSR_TEMT)) == 0x60) );
 102
 103         *uart_tdr = (u8)c;
 104 }
 105
 106 const char *get_system_type(void)
 107 {
 108         return "JZ4740";
 109 }
 110
 111 EXPORT_SYMBOL(prom_getcmdline);