aboutsummaryrefslogtreecommitdiff
path: root/arch/mips/powertv/init.c
blob: 83552288e8024fa697d11e958272fe01399666e6 (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
131
/*
 * Copyright (C) 1999, 2000, 2004, 2005  MIPS Technologies, Inc.
 *	All rights reserved.
 *	Authors: Carsten Langgaard <carstenl@mips.com>
 *		 Maciej W. Rozycki <macro@mips.com>
 * Portions copyright (C) 2009 Cisco Systems, Inc.
 *
 *  This program is free software; you can distribute it and/or modify it
 *  under the terms of the GNU General Public License (Version 2) as
 *  published by the Free Software Foundation.
 *
 *  This program is distributed in the hope it will be useful, but WITHOUT
 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 *  for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
 *
 * PROM library initialisation code.
 */
#include <linux/init.h>
#include <linux/string.h>
#include <linux/kernel.h>

#include <asm/bootinfo.h>
#include <linux/io.h>
#include <asm/system.h>
#include <asm/cacheflush.h>
#include <asm/traps.h>

#include <asm/mips-boards/prom.h>
#include <asm/mips-boards/generic.h>
#include <asm/mach-powertv/asic.h>

static int *_prom_envp;
unsigned long _prom_memsize;

/*
 * YAMON (32-bit PROM) pass arguments and environment as 32-bit pointer.
 * This macro take care of sign extension, if running in 64-bit mode.
 */
#define prom_envp(index) ((char *)(long)_prom_envp[(index)])

char *prom_getenv(char *envname)
{
	char *result = NULL;

	if (_prom_envp != NULL) {
		/*
		 * Return a pointer to the given environment variable.
		 * In 64-bit mode: we're using 64-bit pointers, but all pointers
		 * in the PROM structures are only 32-bit, so we need some
		 * workarounds, if we are running in 64-bit mode.
		 */
		int i, index = 0;

		i = strlen(envname);

		while (prom_envp(index)) {
			if (strncmp(envname, prom_envp(index), i) == 0) {
				result = prom_envp(index + 1);
				break;
			}
			index += 2;
		}
	}

	return result;
}

/* TODO: Verify on linux-mips mailing list that the following two  */
/* functions are correct                                           */
/* TODO: Copy NMI and EJTAG exception vectors to memory from the   */
/* BootROM exception vectors. Flush their cache entries. test it.  */

static void __init mips_nmi_setup(void)
{
	void *base;
#if defined(CONFIG_CPU_MIPS32_R1)
	base = cpu_has_veic ?
		(void *)(CAC_BASE + 0xa80) :
		(void *)(CAC_BASE + 0x380);
#elif defined(CONFIG_CPU_MIPS32_R2)
	base = (void *)0xbfc00000;
#else
#error NMI exception handler address not defined
#endif
}

static void __init mips_ejtag_setup(void)
{
	void *base;

#if defined(CONFIG_CPU_MIPS32_R1)
	base = cpu_has_veic ?
		(void *)(CAC_BASE + 0xa00) :
		(void *)(CAC_BASE + 0x300);
#elif defined(CONFIG_CPU_MIPS32_R2)
	base = (void *)0xbfc00480;
#else
#error EJTAG exception handler address not defined
#endif
}

void __init prom_init(void)
{
	int prom_argc;
	char *prom_argv;

	prom_argc = fw_arg0;
	prom_argv = (char *) fw_arg1;
	_prom_envp = (int *) fw_arg2;
	_prom_memsize = (unsigned long) fw_arg3;

	board_nmi_handler_setup = mips_nmi_setup;
	board_ejtag_handler_setup = mips_ejtag_setup;

	if (prom_argc == 1) {
		strlcat(arcs_cmdline, " ", COMMAND_LINE_SIZE);
		strlcat(arcs_cmdline, prom_argv, COMMAND_LINE_SIZE);
	}

	configure_platform();
	prom_meminit();

#ifndef CONFIG_BOOTLOADER_DRIVER
	pr_info("\nBootloader driver isn't loaded...\n");
#endif
}