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 #include <adm5120_info.h>
  33
  34 void setup_prom_printf(int);
  35 void prom_printf(char *, ...);
  36 void prom_meminit(void);
  37
  38 #define ADM5120_ENVC           1
  39
  40 char *adm5120_envp[2*ADM5120_ENVC] = {"memsize","0x001000000"};
  41
  42 #define READCSR(r)      *(volatile unsigned long *)(0xB2600000+(r))
  43 #define WRITECSR(r,v)   *(volatile unsigned long *)(0xB2600000+(r)) = v
  44
  45 #define UART_DR_REG         0x00
  46 #define UART_FR_REG         0x18
  47 #define UART_TX_FIFO_FULL   0x20
  48
  49 int putPromChar(char c)
  50 {
  51         WRITECSR(UART_DR_REG, c);
  52         while ( (READCSR(UART_FR_REG) & UART_TX_FIFO_FULL) );
  53         return 0;
  54 }
  55
  56 /*
  57  * Ugly prom_printf used for debugging
  58  */
  59
  60 void prom_printf(char *fmt, ...)
  61 {
  62         va_list args;
  63         int l;
  64         char *p, *buf_end;
  65         char buf[1024];
  66
  67         va_start(args, fmt);
  68         l = vsprintf(buf, fmt, args); /* hopefully i < sizeof(buf) */
  69         va_end(args);
  70
  71         buf_end = buf + l;
  72
  73         for (p = buf; p < buf_end; p++) {
  74                 /* Crude cr/nl handling is better than none */
  75                 if (*p == '\n')
  76                         putPromChar('\r');
  77                 putPromChar(*p);
  78         }
  79 }
  80
  81 char *prom_getenv(char *envname)
  82 {
  83         int i, index=0;
  84
  85         i = strlen(envname);
  86
  87         printk(KERN_INFO "GETENV: envname is %s\n", envname);
  88
  89         while(index < (2*ADM5120_ENVC)) {
  90                 if(strncmp(envname, adm5120_envp[index], i) == 0) {
  91                         printk(KERN_INFO "GETENV: returning %s\n", adm5120_envp[index+1]);
  92                         return(adm5120_envp[index+1]);
  93                 }
  94                 index += 2;
  95         }
  96
  97         printk(KERN_INFO "GETENV: not found.\n");
  98         return(NULL);
  99 }
 100
 101
 102 /*
 103  * initialize the prom module.
 104  */
 105 void __init prom_init(void)
 106 {
 107         /* you should these macros defined in include/asm/bootinfo.h */
 108         mips_machgroup = MACH_GROUP_ADM_GW;
 109         mips_machtype = MACH_ADM_GW_5120;
 110
 111         adm5120_info_init();
 112
 113         /* init command line, register a default kernel command line */
 114         strcpy(&(arcs_cmdline[0]), "console=ttyS0,115200 rootfstype=squashfs,jffs2 init=/etc/preinit");
 115
 116         /* init memory map */
 117         prom_meminit();
 118 }