2 * Ralink RT305x SoC specific prom routines
4 * Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published
8 * by the Free Software Foundation.
11 #include <linux/kernel.h>
12 #include <linux/init.h>
14 #include <asm/bootinfo.h>
16 #include <asm/mach-ralink/common.h>
17 #include <asm/mach-ralink/machine.h>
18 #include <asm/mach-ralink/rt305x.h>
19 #include <asm/mach-ralink/rt305x_regs.h>
23 enum ramips_mach_type mach_type
;
26 static int rt305x_prom_argc __initdata
;
27 static char **rt305x_prom_argv __initdata
;
28 static char **rt305x_prom_envp __initdata
;
30 static struct board_rec boards
[] __initdata
= {
33 .mach_type
= RAMIPS_MACH_WHR_G300N
,
37 static inline void *to_ram_addr(void *addr
)
41 base
= KSEG0ADDR(RT305X_SDRAM_BASE
);
42 if (((u32
) addr
> base
) &&
43 ((u32
) addr
< (base
+ RT305X_MEM_SIZE_MAX
)))
46 base
= KSEG1ADDR(RT305X_SDRAM_BASE
);
47 if (((u32
) addr
> base
) &&
48 ((u32
) addr
< (base
+ RT305X_MEM_SIZE_MAX
)))
51 /* some U-Boot variants uses physical addresses */
52 base
= RT305X_SDRAM_BASE
;
53 if (((u32
) addr
> base
) &&
54 ((u32
) addr
< (base
+ RT305X_MEM_SIZE_MAX
)))
55 return (void *)KSEG0ADDR(addr
);
60 static __init
char *rt305x_prom_getargv(const char *name
)
62 int len
= strlen(name
);
65 if (!rt305x_prom_argv
) {
66 printk(KERN_DEBUG
"argv=%p is invalid, skipping\n",
71 for (i
= 0; i
< rt305x_prom_argc
; i
++) {
72 char *argv
= to_ram_addr(rt305x_prom_argv
[i
]);
76 "argv[%d]=%p is invalid, skipping\n",
77 i
, rt305x_prom_argv
[i
]);
81 printk(KERN_DEBUG
"argv[i]: %s\n", argv
);
82 if (strncmp(name
, argv
, len
) == 0 && (argv
)[len
] == '=')
83 return argv
+ len
+ 1;
89 static __init
char *rt305x_prom_getenv(const char *envname
)
91 int len
= strlen(envname
);
95 env
= rt305x_prom_envp
;
97 printk(KERN_DEBUG
"envp=%p is not in RAM, skipping\n",
102 for (p
= to_ram_addr(*env
); p
; env
++) {
103 printk(KERN_DEBUG
"env: %s\n", *env
);
104 if (strncmp(envname
, p
, len
) == 0 && (p
)[len
] == '=')
111 static __init
void find_board_byname(char *name
)
115 for (i
= 0; i
< ARRAY_SIZE(boards
); i
++)
116 if (strcmp(name
, boards
[i
].name
) == 0) {
117 ramips_mach
= boards
[i
].mach_type
;
122 void __init
prom_init(void)
127 "prom: fw_arg0=%08x, fw_arg1=%08x, fw_arg2=%08x, fw_arg3=%08x\n",
128 (unsigned int)fw_arg0
, (unsigned int)fw_arg1
,
129 (unsigned int)fw_arg2
, (unsigned int)fw_arg3
);
131 rt305x_prom_argc
= fw_arg0
;
132 rt305x_prom_argv
= to_ram_addr((void *)fw_arg1
);
133 rt305x_prom_envp
= to_ram_addr((void *)fw_arg2
);
135 p
= rt305x_prom_getargv("board");
137 p
= rt305x_prom_getenv("board");
139 find_board_byname(p
);
142 void __init
prom_free_prom_memory(void)
144 /* We do not have to prom memory to free */