aboutsummaryrefslogtreecommitdiff
path: root/arch/arm/cpu/pxa/cpuinfo.c
blob: f1cdd408eb3537481ab110ae93b921c78b0f1639 (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
/*
 * PXA CPU information display
 *
 * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
 *
 * 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 program is distributed in the hope that 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
 */

#include <common.h>
#include <asm/io.h>
#include <errno.h>
#include <linux/compiler.h>

#define	CPU_MASK_PXA_REVID	0x00f

#define	CPU_MASK_PXA_PRODID	0x3f0
#define	CPU_VALUE_PXA25X	0x100
#define	CPU_VALUE_PXA27X	0x110

static uint32_t pxa_get_cpuid(void)
{
	uint32_t cpuid;
	asm volatile("mrc p15, 0, %0, c0, c0, 0" : "=r"(cpuid));
	return cpuid;
}

int cpu_is_pxa25x(void)
{
	uint32_t id = pxa_get_cpuid();
	id &= CPU_MASK_PXA_PRODID;
	return id == CPU_VALUE_PXA25X;
}

int cpu_is_pxa27x(void)
{
	uint32_t id = pxa_get_cpuid();
	id &= CPU_MASK_PXA_PRODID;
	return id == CPU_VALUE_PXA27X;
}

#ifdef	CONFIG_DISPLAY_CPUINFO
static const char *pxa25x_get_revision(void)
{
	static __maybe_unused const char * const revs_25x[] = { "A0" };
	static __maybe_unused const char * const revs_26x[] = {
								"A0", "B0", "B1"
								};
	static const char *unknown = "Unknown";
	uint32_t id;

	if (!cpu_is_pxa25x())
		return unknown;

	id = pxa_get_cpuid() & CPU_MASK_PXA_REVID;

/* PXA26x is a sick special case as it can't be told apart from PXA25x :-( */
#ifdef	CONFIG_CPU_PXA26X
	switch (id) {
	case 3: return revs_26x[0];
	case 5: return revs_26x[1];
	case 6: return revs_26x[2];
	}
#else
	if (id == 6)
		return revs_25x[0];
#endif
	return unknown;
}

static const char *pxa27x_get_revision(void)
{
	static const char *const rev[] = { "A0", "A1", "B0", "B1", "C0", "C5" };
	static const char *unknown = "Unknown";
	uint32_t id;

	if (!cpu_is_pxa27x())
		return unknown;

	id = pxa_get_cpuid() & CPU_MASK_PXA_REVID;

	if ((id == 5) || (id == 6) || (id > 7))
		return unknown;

	/* Cap the special PXA270 C5 case. */
	if (id == 7)
		id = 5;

	return rev[id];
}

static int print_cpuinfo_pxa2xx(void)
{
	if (cpu_is_pxa25x()) {
		puts("Marvell PXA25x rev. ");
		puts(pxa25x_get_revision());
	} else if (cpu_is_pxa27x()) {
		puts("Marvell PXA27x rev. ");
		puts(pxa27x_get_revision());
	} else
		return -EINVAL;

	puts("\n");

	return 0;
}

int print_cpuinfo(void)
{
	int ret;

	puts("CPU: ");

	ret = print_cpuinfo_pxa2xx();
	if (!ret)
		return ret;

	return ret;
}
#endif