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
38 void setup_prom_printf(int);
39 void prom_printf(char *, ...);
40 void prom_meminit(void);
42 /* we assume we don't know the boot loader by default */
43 int boot_loader_type
= UNKNOWN
;
45 #define ADM5120_ENVC 1
47 char *adm5120_envp
[2*ADM5120_ENVC
] = {"memsize","0x001000000"};
49 #define READCSR(r) *(volatile unsigned long *)(0xB2600000+(r))
50 #define WRITECSR(r,v) *(volatile unsigned long *)(0xB2600000+(r)) = v
52 #define UART_DR_REG 0x00
53 #define UART_FR_REG 0x18
54 #define UART_TX_FIFO_FULL 0x20
56 int putPromChar(char c
)
58 WRITECSR(UART_DR_REG
, c
);
59 while ( (READCSR(UART_FR_REG
) & UART_TX_FIFO_FULL
) );
64 * Ugly prom_printf used for debugging
67 void prom_printf(char *fmt
, ...)
75 l
= vsprintf(buf
, fmt
, args
); /* hopefully i < sizeof(buf) */
80 for (p
= buf
; p
< buf_end
; p
++) {
81 /* Crude cr/nl handling is better than none */
88 char *prom_getenv(char *envname
)
94 printk(KERN_INFO
"GETENV: envname is %s\n", envname
);
96 while(index
< (2*ADM5120_ENVC
)) {
97 if(strncmp(envname
, adm5120_envp
[index
], i
) == 0) {
98 printk(KERN_INFO
"GETENV: returning %s\n", adm5120_envp
[index
+1]);
99 return(adm5120_envp
[index
+1]);
104 printk(KERN_INFO
"GETENV: not found.\n");
109 * initialize the prom module.
111 void __init
prom_init(void)
113 /* you should these macros defined in include/asm/bootinfo.h */
114 mips_machgroup
= MACH_GROUP_ADM_GW
;
115 mips_machtype
= MACH_ADM_GW_5120
;
117 /* init command line, register a default kernel command line */
118 strcpy(&(arcs_cmdline
[0]), "console=ttyS0,115200 rootfstype=squashfs,jffs2 init=/etc/preinit");
120 /* check for CFE by finding the CFE magic number */
121 int *prom_vec
= (int *) fw_arg3
;
123 unsigned int cfe_eptseal
;
126 cfe_eptseal
= (uint32_t)(unsigned long)prom_vec
;
128 if ((int32_t)(long)prom_vec
< 0)
130 * Old loaders all it gives us is the handle,
131 * so assume the seal.
133 cfe_eptseal
= CFE_EPTSEAL
;
136 * Newer loaders bundle the handle/ept/eptseal
138 cfe_eptseal
= (unsigned int)((uint32_t *)prom_vec
)[3];
140 if (cfe_eptseal
== CFE_EPTSEAL
) {
141 boot_loader_type
= CFE
;
142 printk("adm5120 : CFE boot loader\n");
145 /* init memory map */