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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;
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
Ralf Baechle73b43902008-07-16 16:12:25 +0100107 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 }
Dmitri Vorobiev7580c9c2009-10-13 23:43:24 +0300118 cmd_line[COMMAND_LINE_SIZE - 1] = '\0';
Ralf Baechle73b43902008-07-16 16:12:25 +0100119
120 strcpy(arcs_cmdline, cmd_line);
121}
122
123void __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}