blob: a757ded437cdc731e01c82bd003b472cb0295eb7 [file] [log] [blame]
Ralf Baechle73b43902008-07-16 16:12:25 +01001/*
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
Ralf Baechle73b43902008-07-16 16:12:25 +010040unsigned int idt_cpu_freq = 132000000;
41EXPORT_SYMBOL(idt_cpu_freq);
Ralf Baechle73b43902008-07-16 16:12:25 +010042
43static 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
52void __init prom_free_prom_memory(void)
53{
54 /* No prom memory to free */
55}
56
57static inline int match_tag(char *arg, const char *tag)
58{
59 return strncmp(arg, tag, strlen(tag)) == 0;
60}
61
62static 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
70void __init prom_setup_cmdline(void)
71{
Dmitri Vorobiev7580c9c2009-10-13 23:43:24 +030072 static char cmd_line[COMMAND_LINE_SIZE] __initdata;
Ralf Baechle73b43902008-07-16 16:12:25 +010073 char *cp, *board;
74 int prom_argc;
Ralf Baechle66315e12012-09-06 10:51:29 +020075 char **prom_argv;
Ralf Baechle73b43902008-07-16 16:12:25 +010076 int i;
77
78 prom_argc = fw_arg0;
79 prom_argv = (char **) fw_arg1;
Ralf Baechle73b43902008-07-16 16:12:25 +010080
81 cp = cmd_line;
82 /* Note: it is common that parameters start
83 * at argv[1] and not argv[0],
84 * however, our elf loader starts at [0] */
85 for (i = 0; i < prom_argc; i++) {
86 if (match_tag(prom_argv[i], FREQ_TAG)) {
87 idt_cpu_freq = tag2ul(prom_argv[i], FREQ_TAG);
88 continue;
89 }
90#ifdef IGNORE_CMDLINE_MEM
91 /* parses out the "mem=xx" arg */
92 if (match_tag(prom_argv[i], MEM_TAG))
93 continue;
94#endif
95 if (i > 0)
96 *(cp++) = ' ';
97 if (match_tag(prom_argv[i], BOARD_TAG)) {
98 board = prom_argv[i] + strlen(BOARD_TAG);
99
100 if (match_tag(board, BOARD_RB532A))
101 mips_machtype = MACH_MIKROTIK_RB532A;
102 else
103 mips_machtype = MACH_MIKROTIK_RB532;
104 }
105
Ralf Baechle73b43902008-07-16 16:12:25 +0100106 strcpy(cp, prom_argv[i]);
107 cp += strlen(prom_argv[i]);
108 }
109 *(cp++) = ' ';
110
111 i = strlen(arcs_cmdline);
112 if (i > 0) {
113 *(cp++) = ' ';
114 strcpy(cp, arcs_cmdline);
115 cp += strlen(arcs_cmdline);
116 }
Dmitri Vorobiev7580c9c2009-10-13 23:43:24 +0300117 cmd_line[COMMAND_LINE_SIZE - 1] = '\0';
Ralf Baechle73b43902008-07-16 16:12:25 +0100118
119 strcpy(arcs_cmdline, cmd_line);
120}
121
122void __init prom_init(void)
123{
124 struct ddr_ram __iomem *ddr;
125 phys_t memsize;
126 phys_t ddrbase;
127
128 ddr = ioremap_nocache(ddr_reg[0].start,
129 ddr_reg[0].end - ddr_reg[0].start);
130
131 if (!ddr) {
132 printk(KERN_ERR "Unable to remap DDR register\n");
133 return;
134 }
135
136 ddrbase = (phys_t)&ddr->ddrbase;
137 memsize = (phys_t)&ddr->ddrmask;
138 memsize = 0 - memsize;
139
140 prom_setup_cmdline();
141
142 /* give all RAM to boot allocator,
143 * except for the first 0x400 and the last 0x200 bytes */
144 add_memory_region(ddrbase + 0x400, memsize - 0x600, BOOT_MEM_RAM);
145}