summaryrefslogtreecommitdiffstats
path: root/arch/mips/rb532/prom.c
blob: 303cc3dc1749304461e11e6f8c89e6892dc5bb93 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  RouterBoard 500 specific prom routines
 *
 *  Copyright (C) 2003, Peter Sadik <peter.sadik@idt.com>
 *  Copyright (C) 2005-2006, P.Christeas <p_christ@hol.gr>
 *  Copyright (C) 2007, Gabor Juhos <juhosg@openwrt.org>
 *			Felix Fietkau <nbd@openwrt.org>
 *			Florian Fainelli <florian@openwrt.org>
 */

#include <linux/init.h>
#include <linux/mm.h>
#include <linux/export.h>
#include <linux/string.h>
#include <linux/console.h>
#include <linux/memblock.h>
#include <linux/ioport.h>
#include <linux/blkdev.h>

#include <asm/bootinfo.h>
#include <asm/mach-rc32434/ddr.h>
#include <asm/mach-rc32434/prom.h>

unsigned int idt_cpu_freq = 132000000;
EXPORT_SYMBOL(idt_cpu_freq);

static struct resource ddr_reg[] = {
	{
		.name = "ddr-reg",
		.start = DDR0_PHYS_ADDR,
		.end = DDR0_PHYS_ADDR + sizeof(struct ddr_ram),
		.flags = IORESOURCE_MEM,
	}
};

void __init prom_free_prom_memory(void)
{
	/* No prom memory to free */
}

static inline int match_tag(char *arg, const char *tag)
{
	return strncmp(arg, tag, strlen(tag)) == 0;
}

static inline unsigned long tag2ul(char *arg, const char *tag)
{
	char *num;

	num = arg + strlen(tag);
	return simple_strtoul(num, 0, 10);
}

void __init prom_setup_cmdline(void)
{
	static char cmd_line[COMMAND_LINE_SIZE] __initdata;
	char *cp, *board;
	int prom_argc;
	char **prom_argv;
	int i;

	prom_argc = fw_arg0;
	prom_argv = (char **) fw_arg1;

	cp = cmd_line;
		/* Note: it is common that parameters start
		 * at argv[1] and not argv[0],
		 * however, our elf loader starts at [0] */
	for (i = 0; i < prom_argc; i++) {
		if (match_tag(prom_argv[i], FREQ_TAG)) {
			idt_cpu_freq = tag2ul(prom_argv[i], FREQ_TAG);
			continue;
		}
#ifdef IGNORE_CMDLINE_MEM
		/* parses out the "mem=xx" arg */
		if (match_tag(prom_argv[i], MEM_TAG))
			continue;
#endif
		if (i > 0)
			*(cp++) = ' ';
		if (match_tag(prom_argv[i], BOARD_TAG)) {
			board = prom_argv[i] + strlen(BOARD_TAG);

			if (match_tag(board, BOARD_RB532A))
				mips_machtype = MACH_MIKROTIK_RB532A;
			else
				mips_machtype = MACH_MIKROTIK_RB532;
		}

		strcpy(cp, prom_argv[i]);
		cp += strlen(prom_argv[i]);
	}
	*(cp++) = ' ';

	i = strlen(arcs_cmdline);
	if (i > 0) {
		*(cp++) = ' ';
		strcpy(cp, arcs_cmdline);
		cp += strlen(arcs_cmdline);
	}
	cmd_line[COMMAND_LINE_SIZE - 1] = '\0';

	strcpy(arcs_cmdline, cmd_line);
}

void __init prom_init(void)
{
	struct ddr_ram __iomem *ddr;
	phys_addr_t memsize;
	phys_addr_t ddrbase;

	ddr = ioremap(ddr_reg[0].start,
			ddr_reg[0].end - ddr_reg[0].start);

	if (!ddr) {
		printk(KERN_ERR "Unable to remap DDR register\n");
		return;
	}

	ddrbase = (phys_addr_t)&ddr->ddrbase;
	memsize = (phys_addr_t)&ddr->ddrmask;
	memsize = 0 - memsize;

	prom_setup_cmdline();

	/* give all RAM to boot allocator,
	 * except for the first 0x400 and the last 0x200 bytes */
	add_memory_region(ddrbase + 0x400, memsize - 0x600, BOOT_MEM_RAM);
}