]>
git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - arch/mips/rb532/prom.c
2 * RouterBoard 500 specific prom routines
4 * Copyright (C) 2003, Peter Sadik <peter.sadik@idt.com>
5 * Copyright (C) 2005-2006, P.Christeas <p_christ@hol.gr>
6 * Copyright (C) 2007, Gabor Juhos <juhosg@openwrt.org>
7 * Felix Fietkau <nbd@openwrt.org>
8 * Florian Fainelli <florian@openwrt.org>
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version 2
13 * of the License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the
22 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
23 * Boston, MA 02110-1301, USA.
27 #include <linux/init.h>
29 #include <linux/module.h>
30 #include <linux/string.h>
31 #include <linux/console.h>
32 #include <linux/bootmem.h>
33 #include <linux/ioport.h>
34 #include <linux/blkdev.h>
36 #include <asm/bootinfo.h>
37 #include <asm/mach-rc32434/ddr.h>
38 #include <asm/mach-rc32434/prom.h>
40 extern void __init
setup_serial_port(void);
42 unsigned int idt_cpu_freq
= 132000000;
43 EXPORT_SYMBOL(idt_cpu_freq
);
44 unsigned int gpio_bootup_state
;
45 EXPORT_SYMBOL(gpio_bootup_state
);
47 static struct resource ddr_reg
[] = {
50 .start
= DDR0_PHYS_ADDR
,
51 .end
= DDR0_PHYS_ADDR
+ sizeof(struct ddr_ram
),
52 .flags
= IORESOURCE_MEM
,
56 void __init
prom_free_prom_memory(void)
58 /* No prom memory to free */
61 static inline int match_tag(char *arg
, const char *tag
)
63 return strncmp(arg
, tag
, strlen(tag
)) == 0;
66 static inline unsigned long tag2ul(char *arg
, const char *tag
)
70 num
= arg
+ strlen(tag
);
71 return simple_strtoul(num
, 0, 10);
74 void __init
prom_setup_cmdline(void)
76 char cmd_line
[CL_SIZE
];
79 char **prom_argv
, **prom_envp
;
83 prom_argv
= (char **) fw_arg1
;
84 prom_envp
= (char **) fw_arg2
;
87 /* Note: it is common that parameters start
88 * at argv[1] and not argv[0],
89 * however, our elf loader starts at [0] */
90 for (i
= 0; i
< prom_argc
; i
++) {
91 if (match_tag(prom_argv
[i
], FREQ_TAG
)) {
92 idt_cpu_freq
= tag2ul(prom_argv
[i
], FREQ_TAG
);
95 #ifdef IGNORE_CMDLINE_MEM
96 /* parses out the "mem=xx" arg */
97 if (match_tag(prom_argv
[i
], MEM_TAG
))
102 if (match_tag(prom_argv
[i
], BOARD_TAG
)) {
103 board
= prom_argv
[i
] + strlen(BOARD_TAG
);
105 if (match_tag(board
, BOARD_RB532A
))
106 mips_machtype
= MACH_MIKROTIK_RB532A
;
108 mips_machtype
= MACH_MIKROTIK_RB532
;
111 if (match_tag(prom_argv
[i
], GPIO_TAG
))
112 gpio_bootup_state
= tag2ul(prom_argv
[i
], GPIO_TAG
);
114 strcpy(cp
, prom_argv
[i
]);
115 cp
+= strlen(prom_argv
[i
]);
119 i
= strlen(arcs_cmdline
);
122 strcpy(cp
, arcs_cmdline
);
123 cp
+= strlen(arcs_cmdline
);
125 if (gpio_bootup_state
& 0x02)
126 strcpy(cp
, GPIO_INIT_NOBUTTON
);
128 strcpy(cp
, GPIO_INIT_BUTTON
);
130 cmd_line
[CL_SIZE
-1] = '\0';
132 strcpy(arcs_cmdline
, cmd_line
);
135 void __init
prom_init(void)
137 struct ddr_ram __iomem
*ddr
;
141 ddr
= ioremap_nocache(ddr_reg
[0].start
,
142 ddr_reg
[0].end
- ddr_reg
[0].start
);
145 printk(KERN_ERR
"Unable to remap DDR register\n");
149 ddrbase
= (phys_t
)&ddr
->ddrbase
;
150 memsize
= (phys_t
)&ddr
->ddrmask
;
151 memsize
= 0 - memsize
;
153 prom_setup_cmdline();
155 /* give all RAM to boot allocator,
156 * except for the first 0x400 and the last 0x200 bytes */
157 add_memory_region(ddrbase
+ 0x400, memsize
- 0x600, BOOT_MEM_RAM
);