1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * PXA CPU information display
4 *
5 * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
6 */
7
8 #include <common.h>
9 #include <init.h>
10 #include <asm/io.h>
11 #include <errno.h>
12 #include <linux/compiler.h>
13
14 #ifdef CONFIG_CPU_PXA25X
15 #if ((CONFIG_SYS_INIT_SP_ADDR) != 0xfffff800)
16 #error "Init SP address must be set to 0xfffff800 for PXA250"
17 #endif
18 #endif
19
20 #define CPU_MASK_PXA_PRODID 0x000003f0
21 #define CPU_MASK_PXA_REVID 0x0000000f
22
23 #define CPU_MASK_PRODREV (CPU_MASK_PXA_PRODID | CPU_MASK_PXA_REVID)
24
25 #define CPU_VALUE_PXA25X 0x100
26 #define CPU_VALUE_PXA27X 0x110
27
pxa_get_cpuid(void)28 static uint32_t pxa_get_cpuid(void)
29 {
30 uint32_t cpuid;
31 asm volatile("mrc p15, 0, %0, c0, c0, 0" : "=r"(cpuid));
32 return cpuid;
33 }
34
cpu_is_pxa25x(void)35 int cpu_is_pxa25x(void)
36 {
37 uint32_t id = pxa_get_cpuid();
38 id &= CPU_MASK_PXA_PRODID;
39 return id == CPU_VALUE_PXA25X;
40 }
41
cpu_is_pxa27x(void)42 int cpu_is_pxa27x(void)
43 {
44 uint32_t id = pxa_get_cpuid();
45 id &= CPU_MASK_PXA_PRODID;
46 return id == CPU_VALUE_PXA27X;
47 }
48
cpu_is_pxa27xm(void)49 int cpu_is_pxa27xm(void)
50 {
51 uint32_t id = pxa_get_cpuid();
52 return ((id & CPU_MASK_PXA_PRODID) == CPU_VALUE_PXA27X) &&
53 ((id & CPU_MASK_PXA_REVID) == 8);
54 }
55
pxa_get_cpu_revision(void)56 uint32_t pxa_get_cpu_revision(void)
57 {
58 return pxa_get_cpuid() & CPU_MASK_PRODREV;
59 }
60
61 #ifdef CONFIG_DISPLAY_CPUINFO
pxa25x_get_revision(void)62 static const char *pxa25x_get_revision(void)
63 {
64 static __maybe_unused const char * const revs_25x[] = { "A0" };
65 static __maybe_unused const char * const revs_26x[] = {
66 "A0", "B0", "B1"
67 };
68 static const char *unknown = "Unknown";
69 uint32_t id;
70
71 if (!cpu_is_pxa25x())
72 return unknown;
73
74 id = pxa_get_cpuid() & CPU_MASK_PXA_REVID;
75
76 /* PXA26x is a sick special case as it can't be told apart from PXA25x :-( */
77 #ifdef CONFIG_CPU_PXA26X
78 switch (id) {
79 case 3: return revs_26x[0];
80 case 5: return revs_26x[1];
81 case 6: return revs_26x[2];
82 }
83 #else
84 if (id == 6)
85 return revs_25x[0];
86 #endif
87 return unknown;
88 }
89
pxa27x_get_revision(void)90 static const char *pxa27x_get_revision(void)
91 {
92 static const char *const rev[] = { "A0", "A1", "B0", "B1", "C0", "C5" };
93 static const char *unknown = "Unknown";
94 uint32_t id;
95
96 if (!cpu_is_pxa27x())
97 return unknown;
98
99 id = pxa_get_cpuid() & CPU_MASK_PXA_REVID;
100
101 if ((id == 5) || (id == 6) || (id > 8))
102 return unknown;
103
104 /* Cap the special PXA270 C5 case. */
105 if (id == 7)
106 id = 5;
107
108 /* Cap the special PXA270M A1 case. */
109 if (id == 8)
110 id = 1;
111
112 return rev[id];
113 }
114
print_cpuinfo_pxa2xx(void)115 static int print_cpuinfo_pxa2xx(void)
116 {
117 if (cpu_is_pxa25x()) {
118 puts("Marvell PXA25x rev. ");
119 puts(pxa25x_get_revision());
120 } else if (cpu_is_pxa27x()) {
121 puts("Marvell PXA27x");
122 if (cpu_is_pxa27xm()) puts("M");
123 puts(" rev. ");
124 puts(pxa27x_get_revision());
125 } else
126 return -EINVAL;
127
128 puts("\n");
129
130 return 0;
131 }
132
print_cpuinfo(void)133 int print_cpuinfo(void)
134 {
135 int ret;
136
137 puts("CPU: ");
138
139 ret = print_cpuinfo_pxa2xx();
140 if (!ret)
141 return ret;
142
143 return ret;
144 }
145 #endif
146