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
40unsigned int idt_cpu_freq = 132000000;
41EXPORT_SYMBOL(idt_cpu_freq);
42
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{
72	static char cmd_line[COMMAND_LINE_SIZE] __initdata;
73	char *cp, *board;
74	int prom_argc;
75	char **prom_argv;
76	int i;
77
78	prom_argc = fw_arg0;
79	prom_argv = (char **) fw_arg1;
80
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
106		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	}
117	cmd_line[COMMAND_LINE_SIZE - 1] = '\0';
118
119	strcpy(arcs_cmdline, cmd_line);
120}
121
122void __init prom_init(void)
123{
124	struct ddr_ram __iomem *ddr;
125	phys_addr_t memsize;
126	phys_addr_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_addr_t)&ddr->ddrbase;
137	memsize = (phys_addr_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}
146