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29f9087c SH |
1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file "COPYING" in the main directory of this archive | |
4 | * for more details. | |
5 | * | |
6 | * Copyright (C) 2013 Imagination Technologies Ltd. | |
7 | */ | |
8 | ||
9 | #include <linux/kernel.h> | |
10 | #include <linux/debugfs.h> | |
11 | #include <linux/seq_file.h> | |
12 | #include <asm/cpu.h> | |
75dcfc1d | 13 | #include <asm/debug.h> |
29f9087c SH |
14 | #include <asm/mipsregs.h> |
15 | ||
16 | static void build_segment_config(char *str, unsigned int cfg) | |
17 | { | |
18 | unsigned int am; | |
19 | static const char * const am_str[] = { | |
20 | "UK", "MK", "MSK", "MUSK", "MUSUK", "USK", | |
21 | "RSRVD", "UUSK"}; | |
22 | ||
23 | /* Segment access mode. */ | |
24 | am = (cfg & MIPS_SEGCFG_AM) >> MIPS_SEGCFG_AM_SHIFT; | |
25 | str += sprintf(str, "%-5s", am_str[am]); | |
26 | ||
27 | /* | |
28 | * Access modes MK, MSK and MUSK are mapped segments. Therefore | |
5573f6ad JH |
29 | * there is no direct physical address mapping unless it becomes |
30 | * unmapped uncached at error level due to EU. | |
29f9087c | 31 | */ |
5573f6ad | 32 | if ((am == 0) || (am > 3) || (cfg & MIPS_SEGCFG_EU)) |
29f9087c SH |
33 | str += sprintf(str, " %03lx", |
34 | ((cfg & MIPS_SEGCFG_PA) >> MIPS_SEGCFG_PA_SHIFT)); | |
5573f6ad JH |
35 | else |
36 | str += sprintf(str, " UND"); | |
37 | ||
38 | if ((am == 0) || (am > 3)) | |
29f9087c SH |
39 | str += sprintf(str, " %01ld", |
40 | ((cfg & MIPS_SEGCFG_C) >> MIPS_SEGCFG_C_SHIFT)); | |
5573f6ad | 41 | else |
29f9087c | 42 | str += sprintf(str, " U"); |
29f9087c SH |
43 | |
44 | /* Exception configuration. */ | |
45 | str += sprintf(str, " %01ld\n", | |
46 | ((cfg & MIPS_SEGCFG_EU) >> MIPS_SEGCFG_EU_SHIFT)); | |
47 | } | |
48 | ||
49 | static int show_segments(struct seq_file *m, void *v) | |
50 | { | |
51 | unsigned int segcfg; | |
52 | char str[42]; | |
53 | ||
54 | seq_puts(m, "Segment Virtual Size Access Mode Physical Caching EU\n"); | |
55 | seq_puts(m, "------- ------- ---- ----------- -------- ------- --\n"); | |
56 | ||
57 | segcfg = read_c0_segctl0(); | |
58 | build_segment_config(str, segcfg); | |
59 | seq_printf(m, " 0 e0000000 512M %s", str); | |
60 | ||
61 | segcfg >>= 16; | |
62 | build_segment_config(str, segcfg); | |
63 | seq_printf(m, " 1 c0000000 512M %s", str); | |
64 | ||
65 | segcfg = read_c0_segctl1(); | |
66 | build_segment_config(str, segcfg); | |
67 | seq_printf(m, " 2 a0000000 512M %s", str); | |
68 | ||
69 | segcfg >>= 16; | |
70 | build_segment_config(str, segcfg); | |
71 | seq_printf(m, " 3 80000000 512M %s", str); | |
72 | ||
73 | segcfg = read_c0_segctl2(); | |
74 | build_segment_config(str, segcfg); | |
75 | seq_printf(m, " 4 40000000 1G %s", str); | |
76 | ||
77 | segcfg >>= 16; | |
78 | build_segment_config(str, segcfg); | |
79 | seq_printf(m, " 5 00000000 1G %s\n", str); | |
80 | ||
81 | return 0; | |
82 | } | |
83 | ||
84 | static int segments_open(struct inode *inode, struct file *file) | |
85 | { | |
86 | return single_open(file, show_segments, NULL); | |
87 | } | |
88 | ||
89 | static const struct file_operations segments_fops = { | |
90 | .open = segments_open, | |
91 | .read = seq_read, | |
92 | .llseek = seq_lseek, | |
93 | .release = single_release, | |
94 | }; | |
95 | ||
96 | static int __init segments_info(void) | |
97 | { | |
29f9087c SH |
98 | struct dentry *segments; |
99 | ||
100 | if (cpu_has_segments) { | |
101 | if (!mips_debugfs_dir) | |
102 | return -ENODEV; | |
103 | ||
104 | segments = debugfs_create_file("segments", S_IRUGO, | |
105 | mips_debugfs_dir, NULL, | |
106 | &segments_fops); | |
107 | if (!segments) | |
108 | return -ENOMEM; | |
109 | } | |
110 | return 0; | |
111 | } | |
112 | ||
113 | device_initcall(segments_info); |