summaryrefslogtreecommitdiff
path: root/arch/arm/cpu/pxa/cpuinfo.c
blob: 9d16079956235d156f0d1c57727487813eb7a924 (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
/*
 * PXA CPU information display
 *
 * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

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

#define	CPU_MASK_PXA_PRODID	0x000003f0
#define	CPU_MASK_PXA_REVID	0x0000000f

#define	CPU_MASK_PRODREV	(CPU_MASK_PXA_PRODID | CPU_MASK_PXA_REVID)

#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;
}

uint32_t pxa_get_cpu_revision(void)
{
	return pxa_get_cpuid() & CPU_MASK_PRODREV;
}

#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