Commit | Line | Data |
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73b4390f RB |
1 | /* |
2 | * RouterBoard 500 specific prom routines | |
3 | * | |
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> | |
9 | * | |
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. | |
14 | * | |
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. | |
19 | * | |
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. | |
24 | * | |
25 | */ | |
26 | ||
27 | #include <linux/init.h> | |
28 | #include <linux/mm.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> | |
35 | ||
36 | #include <asm/bootinfo.h> | |
37 | #include <asm/mach-rc32434/ddr.h> | |
38 | #include <asm/mach-rc32434/prom.h> | |
39 | ||
73b4390f RB |
40 | unsigned int idt_cpu_freq = 132000000; |
41 | EXPORT_SYMBOL(idt_cpu_freq); | |
73b4390f RB |
42 | |
43 | static struct resource ddr_reg[] = { | |
44 | { | |
45 | .name = "ddr-reg", | |
46 | .start = DDR0_PHYS_ADDR, | |
47 | .end = DDR0_PHYS_ADDR + sizeof(struct ddr_ram), | |
48 | .flags = IORESOURCE_MEM, | |
49 | } | |
50 | }; | |
51 | ||
52 | void __init prom_free_prom_memory(void) | |
53 | { | |
54 | /* No prom memory to free */ | |
55 | } | |
56 | ||
57 | static inline int match_tag(char *arg, const char *tag) | |
58 | { | |
59 | return strncmp(arg, tag, strlen(tag)) == 0; | |
60 | } | |
61 | ||
62 | static inline unsigned long tag2ul(char *arg, const char *tag) | |
63 | { | |
64 | char *num; | |
65 | ||
66 | num = arg + strlen(tag); | |
67 | return simple_strtoul(num, 0, 10); | |
68 | } | |
69 | ||
70 | void __init prom_setup_cmdline(void) | |
71 | { | |
7580c9c3 | 72 | static char cmd_line[COMMAND_LINE_SIZE] __initdata; |
73b4390f RB |
73 | char *cp, *board; |
74 | int prom_argc; | |
75 | char **prom_argv, **prom_envp; | |
76 | int i; | |
77 | ||
78 | prom_argc = fw_arg0; | |
79 | prom_argv = (char **) fw_arg1; | |
80 | prom_envp = (char **) fw_arg2; | |
81 | ||
82 | cp = cmd_line; | |
83 | /* Note: it is common that parameters start | |
84 | * at argv[1] and not argv[0], | |
85 | * however, our elf loader starts at [0] */ | |
86 | for (i = 0; i < prom_argc; i++) { | |
87 | if (match_tag(prom_argv[i], FREQ_TAG)) { | |
88 | idt_cpu_freq = tag2ul(prom_argv[i], FREQ_TAG); | |
89 | continue; | |
90 | } | |
91 | #ifdef IGNORE_CMDLINE_MEM | |
92 | /* parses out the "mem=xx" arg */ | |
93 | if (match_tag(prom_argv[i], MEM_TAG)) | |
94 | continue; | |
95 | #endif | |
96 | if (i > 0) | |
97 | *(cp++) = ' '; | |
98 | if (match_tag(prom_argv[i], BOARD_TAG)) { | |
99 | board = prom_argv[i] + strlen(BOARD_TAG); | |
100 | ||
101 | if (match_tag(board, BOARD_RB532A)) | |
102 | mips_machtype = MACH_MIKROTIK_RB532A; | |
103 | else | |
104 | mips_machtype = MACH_MIKROTIK_RB532; | |
105 | } | |
106 | ||
73b4390f RB |
107 | strcpy(cp, prom_argv[i]); |
108 | cp += strlen(prom_argv[i]); | |
109 | } | |
110 | *(cp++) = ' '; | |
111 | ||
112 | i = strlen(arcs_cmdline); | |
113 | if (i > 0) { | |
114 | *(cp++) = ' '; | |
115 | strcpy(cp, arcs_cmdline); | |
116 | cp += strlen(arcs_cmdline); | |
117 | } | |
7580c9c3 | 118 | cmd_line[COMMAND_LINE_SIZE - 1] = '\0'; |
73b4390f RB |
119 | |
120 | strcpy(arcs_cmdline, cmd_line); | |
121 | } | |
122 | ||
123 | void __init prom_init(void) | |
124 | { | |
125 | struct ddr_ram __iomem *ddr; | |
126 | phys_t memsize; | |
127 | phys_t ddrbase; | |
128 | ||
129 | ddr = ioremap_nocache(ddr_reg[0].start, | |
130 | ddr_reg[0].end - ddr_reg[0].start); | |
131 | ||
132 | if (!ddr) { | |
133 | printk(KERN_ERR "Unable to remap DDR register\n"); | |
134 | return; | |
135 | } | |
136 | ||
137 | ddrbase = (phys_t)&ddr->ddrbase; | |
138 | memsize = (phys_t)&ddr->ddrmask; | |
139 | memsize = 0 - memsize; | |
140 | ||
141 | prom_setup_cmdline(); | |
142 | ||
143 | /* give all RAM to boot allocator, | |
144 | * except for the first 0x400 and the last 0x200 bytes */ | |
145 | add_memory_region(ddrbase + 0x400, memsize - 0x600, BOOT_MEM_RAM); | |
146 | } |