summaryrefslogtreecommitdiffstats
path: root/arch/mips/bcm47xx/prom.c
blob: c51405e5792117d868b99dc2fe21c30c8f06061d (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
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
/*
 *  Copyright (C) 2004 Florian Schirmer <jolt@tuxbox.org>
 *  Copyright (C) 2007 Aurelien Jarno <aurelien@aurel32.net>
 *
 *  This program is free software; you can redistribute  it and/or modify it
 *  under  the terms of  the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 *
 *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
 *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
 *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
 *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *  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.,
 *  675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/init.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/spinlock.h>
#include <asm/bootinfo.h>
#include <asm/fw/cfe/cfe_api.h>
#include <asm/fw/cfe/cfe_error.h>

static int cfe_cons_handle;

const char *get_system_type(void)
{
	return "Broadcom BCM47XX";
}

void prom_putchar(char c)
{
	while (cfe_write(cfe_cons_handle, &c, 1) == 0)
		;
}

static __init void prom_init_cfe(void)
{
	uint32_t cfe_ept;
	uint32_t cfe_handle;
	uint32_t cfe_eptseal;
	int argc = fw_arg0;
	char **envp = (char **) fw_arg2;
	int *prom_vec = (int *) fw_arg3;

	/*
	 * Check if a loader was used; if NOT, the 4 arguments are
	 * what CFE gives us (handle, 0, EPT and EPTSEAL)
	 */
	if (argc < 0) {
		cfe_handle = (uint32_t)argc;
		cfe_ept = (uint32_t)envp;
		cfe_eptseal = (uint32_t)prom_vec;
	} else {
		if ((int)prom_vec < 0) {
			/*
			 * Old loader; all it gives us is the handle,
			 * so use the "known" entrypoint and assume
			 * the seal.
			 */
			cfe_handle = (uint32_t)prom_vec;
			cfe_ept = 0xBFC00500;
			cfe_eptseal = CFE_EPTSEAL;
		} else {
			/*
			 * Newer loaders bundle the handle/ept/eptseal
			 * Note: prom_vec is in the loader's useg
			 * which is still alive in the TLB.
			 */
			cfe_handle = prom_vec[0];
			cfe_ept = prom_vec[2];
			cfe_eptseal = prom_vec[3];
		}
	}

	if (cfe_eptseal != CFE_EPTSEAL) {
		/* too early for panic to do any good */
		printk(KERN_ERR "CFE's entrypoint seal doesn't match.");
		while (1) ;
	}

	cfe_init(cfe_handle, cfe_ept);
}

static __init void prom_init_console(void)
{
	/* Initialize CFE console */
	cfe_cons_handle = cfe_getstdhandle(CFE_STDHANDLE_CONSOLE);
}

static __init void prom_init_cmdline(void)
{
	static char buf[COMMAND_LINE_SIZE] __initdata;

	/* Get the kernel command line from CFE */
	if (cfe_getenv("LINUX_CMDLINE", buf, COMMAND_LINE_SIZE) >= 0) {
		buf[COMMAND_LINE_SIZE - 1] = 0;
		strcpy(arcs_cmdline, buf);
	}

	/* Force a console handover by adding a console= argument if needed,
	 * as CFE is not available anymore later in the boot process. */
	if ((strstr(arcs_cmdline, "console=")) == NULL) {
		/* Try to read the default serial port used by CFE */
		if ((cfe_getenv("BOOT_CONSOLE", buf, COMMAND_LINE_SIZE) < 0)
		    || (strncmp("uart", buf, 4)))
			/* Default to uart0 */
			strcpy(buf, "uart0");

		/* Compute the new command line */
		snprintf(arcs_cmdline, COMMAND_LINE_SIZE, "%s console=ttyS%c,115200",
			 arcs_cmdline, buf[4]);
	}
}

static __init void prom_init_mem(void)
{
	unsigned long mem;

	/* Figure out memory size by finding aliases.
	 *
	 * We should theoretically use the mapping from CFE using cfe_enummem().
	 * However as the BCM47XX is mostly used on low-memory systems, we
	 * want to reuse the memory used by CFE (around 4MB). That means cfe_*
	 * functions stop to work at some point during the boot, we should only
	 * call them at the beginning of the boot.
	 */
	for (mem = (1 << 20); mem < (128 << 20); mem += (1 << 20)) {
		if (*(unsigned long *)((unsigned long)(prom_init) + mem) ==
		    *(unsigned long *)(prom_init))
			break;
	}

	add_memory_region(0, mem, BOOT_MEM_RAM);
}

void __init prom_init(void)
{
	prom_init_cfe();
	prom_init_console();
	prom_init_cmdline();
	prom_init_mem();
}

void __init prom_free_prom_memory(void)
{
}