target/linux/adm5120-2.6/files/arch/mips/adm5120/prom.c

   1 /*****************************************************************************
   2  * Carsten Langgaard, carstenl@mips.com
   3  * Copyright (C) 1999,2000 MIPS Technologies, Inc.  All rights reserved.
   4  * Copyright (C) 2003 ADMtek Incorporated.
   5  *      daniell@admtek.com.tw
   6  *
   7  *  This program is free software; you can distribute it and/or modify it
   8  *  under the terms of the GNU General Public License (Version 2) as
   9  *  published by the Free Software Foundation.
  10  *
  11  *  This program is distributed in the hope it will be useful, but WITHOUT
  12  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  *  for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License along
  17  *  with this program; if not, write to the Free Software Foundation, Inc.,
  18  *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
  19  *
  20  *****************************************************************************/
  21
  22 #include <linux/init.h>
  23 #include <linux/autoconf.h>
  24 #include <linux/kernel.h>
  25 #include <linux/string.h>
  26 #include <linux/mm.h>
  27 #include <linux/bootmem.h>
  28
  29 #include <asm/bootinfo.h>
  30 #include <asm/addrspace.h>
  31
  32 void setup_prom_printf(int);
  33 void prom_printf(char *, ...);
  34 void prom_meminit(void);
  35
  36 #define ADM5120_ENVC           1
  37
  38 char *adm5120_envp[2*ADM5120_ENVC] = {"memsize","0x001000000"};
  39
  40 #define READCSR(r)      *(volatile unsigned long *)(0xB2600000+(r))
  41 #define WRITECSR(r,v)   *(volatile unsigned long *)(0xB2600000+(r)) = v
  42
  43 #define UART_DR_REG         0x00
  44 #define UART_FR_REG         0x18
  45 #define UART_TX_FIFO_FULL   0x20
  46
  47 int putPromChar(char c)
  48 {
  49         WRITECSR(UART_DR_REG, c);
  50         while ( (READCSR(UART_FR_REG) & UART_TX_FIFO_FULL) );
  51         return 0;
  52 }
  53
  54 /*
  55  * Ugly prom_printf used for debugging
  56  */
  57
  58 void prom_printf(char *fmt, ...)
  59 {
  60         va_list args;
  61         int l;
  62         char *p, *buf_end;
  63         char buf[1024];
  64
  65         va_start(args, fmt);
  66         l = vsprintf(buf, fmt, args); /* hopefully i < sizeof(buf) */
  67         va_end(args);
  68
  69         buf_end = buf + l;
  70
  71         for (p = buf; p < buf_end; p++) {
  72                 /* Crude cr/nl handling is better than none */
  73                 if (*p == '\n')
  74                         putPromChar('\r');
  75                 putPromChar(*p);
  76         }
  77 }
  78
  79 char *prom_getenv(char *envname)
  80 {
  81         int i, index=0;
  82
  83         i = strlen(envname);
  84
  85         printk(KERN_INFO "GETENV: envname is %s\n", envname);
  86
  87         while(index < (2*ADM5120_ENVC)) {
  88                 if(strncmp(envname, adm5120_envp[index], i) == 0) {
  89                         printk(KERN_INFO "GETENV: returning %s\n", adm5120_envp[index+1]);
  90                         return(adm5120_envp[index+1]);
  91                 }
  92                 index += 2;
  93         }
  94
  95         printk(KERN_INFO "GETENV: not found.\n");
  96         return(NULL);
  97 }
  98
  99 /*
 100  * initialize the prom module.
 101  */
 102 void __init prom_init(void)
 103 {
 104         /* you should these macros defined in include/asm/bootinfo.h */
 105         mips_machgroup = MACH_GROUP_ADM_GW;
 106         mips_machtype = MACH_ADM_GW_5120;
 107
 108         /* init command line, register a default kernel command line */
 109         strcpy(&(arcs_cmdline[0]), "console=ttyS0,115200 rootfstype=jffs2 init=/etc/preinit");
 110
 111         /* init memory map */
 112         prom_meminit();
 113 }