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