1/*
2 * Copyright (c) 2011 Zhang, Keguang <keguang.zhang@gmail.com>
3 *
4 * Modified from arch/mips/pnx833x/common/prom.c.
5 *
6 * This program is free software; you can redistribute	it and/or modify it
7 * under  the terms of	the GNU General	 Public License as published by the
8 * Free Software Foundation;  either version 2 of the  License, or (at your
9 * option) any later version.
10 */
11
12#include <linux/serial_reg.h>
13#include <asm/bootinfo.h>
14
15#include <loongson1.h>
16#include <prom.h>
17
18int prom_argc;
19char **prom_argv, **prom_envp;
20unsigned long memsize, highmemsize;
21
22char *prom_getenv(char *envname)
23{
24	char **env = prom_envp;
25	int i;
26
27	i = strlen(envname);
28
29	while (*env) {
30		if (strncmp(envname, *env, i) == 0 && *(*env + i) == '=')
31			return *env + i + 1;
32		env++;
33	}
34
35	return 0;
36}
37
38static inline unsigned long env_or_default(char *env, unsigned long dfl)
39{
40	char *str = prom_getenv(env);
41	return str ? simple_strtol(str, 0, 0) : dfl;
42}
43
44void __init prom_init_cmdline(void)
45{
46	char *c = &(arcs_cmdline[0]);
47	int i;
48
49	for (i = 1; i < prom_argc; i++) {
50		strcpy(c, prom_argv[i]);
51		c += strlen(prom_argv[i]);
52		if (i < prom_argc - 1)
53			*c++ = ' ';
54	}
55	*c = 0;
56}
57
58void __init prom_init(void)
59{
60	void __iomem *uart_base;
61	prom_argc = fw_arg0;
62	prom_argv = (char **)fw_arg1;
63	prom_envp = (char **)fw_arg2;
64
65	prom_init_cmdline();
66
67	memsize = env_or_default("memsize", DEFAULT_MEMSIZE);
68	highmemsize = env_or_default("highmemsize", 0x0);
69
70	if (strstr(arcs_cmdline, "console=ttyS3"))
71		uart_base = ioremap_nocache(LS1X_UART3_BASE, 0x0f);
72	else if (strstr(arcs_cmdline, "console=ttyS2"))
73		uart_base = ioremap_nocache(LS1X_UART2_BASE, 0x0f);
74	else if (strstr(arcs_cmdline, "console=ttyS1"))
75		uart_base = ioremap_nocache(LS1X_UART1_BASE, 0x0f);
76	else
77		uart_base = ioremap_nocache(LS1X_UART0_BASE, 0x0f);
78	setup_8250_early_printk_port((unsigned long)uart_base, 0, 0);
79}
80
81void __init prom_free_prom_memory(void)
82{
83}
84