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
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.
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
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.
20 *****************************************************************************/
22 #include <linux/init.h>
23 #include <linux/autoconf.h>
24 #include <linux/kernel.h>
25 #include <linux/string.h>
27 #include <linux/bootmem.h>
29 #include <asm/bootinfo.h>
30 #include <asm/addrspace.h>
32 /* boot loaders specific definitions */
33 #define CFE_EPTSEAL 0x43464531 /* CFE1 is the magic number to recognize CFE from other bootloaders */
39 void setup_prom_printf(int);
40 void prom_printf(char *, ...);
41 void prom_meminit(void);
43 /* we assume we don't know the boot loader by default */
44 int boot_loader_type = UNKNOWN;
46 #define ADM5120_ENVC 1
48 char *adm5120_envp[2*ADM5120_ENVC] = {"memsize","0x001000000"};
50 #define READCSR(r) *(volatile unsigned long *)(0xB2600000+(r))
51 #define WRITECSR(r,v) *(volatile unsigned long *)(0xB2600000+(r)) = v
53 #define UART_DR_REG 0x00
54 #define UART_FR_REG 0x18
55 #define UART_TX_FIFO_FULL 0x20
57 int putPromChar(char c)
59 WRITECSR(UART_DR_REG, c);
60 while ( (READCSR(UART_FR_REG) & UART_TX_FIFO_FULL) );
65 * Ugly prom_printf used for debugging
68 void prom_printf(char *fmt, ...)
76 l = vsprintf(buf, fmt, args); /* hopefully i < sizeof(buf) */
81 for (p = buf; p < buf_end; p++) {
82 /* Crude cr/nl handling is better than none */
89 char *prom_getenv(char *envname)
95 printk(KERN_INFO "GETENV: envname is %s\n", envname);
97 while(index < (2*ADM5120_ENVC)) {
98 if(strncmp(envname, adm5120_envp[index], i) == 0) {
99 printk(KERN_INFO "GETENV: returning %s\n", adm5120_envp[index+1]);
100 return(adm5120_envp[index+1]);
105 printk(KERN_INFO "GETENV: not found.\n");
110 * initialize the prom module.
112 void __init prom_init(void)
114 /* you should these macros defined in include/asm/bootinfo.h */
115 mips_machgroup = MACH_GROUP_ADM_GW;
116 mips_machtype = MACH_ADM_GW_5120;
118 /* init command line, register a default kernel command line */
119 strcpy(&(arcs_cmdline[0]), "console=ttyS0,115200 rootfstype=squashfs,jffs2 init=/etc/preinit");
121 /* check for CFE by finding the CFE magic number */
122 int *prom_vec = (int *) fw_arg3;
124 unsigned int cfe_eptseal;
127 cfe_eptseal = (uint32_t)(unsigned long)prom_vec;
129 if ((int32_t)(long)prom_vec < 0)
131 * Old loaders all it gives us is the handle,
132 * so assume the seal.
134 cfe_eptseal = CFE_EPTSEAL;
137 * Newer loaders bundle the handle/ept/eptseal
139 cfe_eptseal = (unsigned int)((uint32_t *)prom_vec)[3];
141 if (cfe_eptseal == CFE_EPTSEAL) {
142 boot_loader_type = CFE;
143 printk("adm5120 : CFE boot loader\n");
146 /* init memory map */