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Commit | Line | Data |
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8b7d89d0 | 1 | /* |
fab852aa | 2 | * Written by Pekka Paalanen, 2008-2009 <pq@iki.fi> |
8b7d89d0 | 3 | */ |
3c355863 JP |
4 | |
5 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
6 | ||
8b7d89d0 | 7 | #include <linux/module.h> |
970e6fa0 | 8 | #include <linux/io.h> |
9e57fb35 | 9 | #include <linux/mmiotrace.h> |
8b7d89d0 | 10 | |
8b7d89d0 PP |
11 | static unsigned long mmio_address; |
12 | module_param(mmio_address, ulong, 0); | |
5ff93697 PP |
13 | MODULE_PARM_DESC(mmio_address, " Start address of the mapping of 16 kB " |
14 | "(or 8 MB if read_far is non-zero)."); | |
15 | ||
16 | static unsigned long read_far = 0x400100; | |
17 | module_param(read_far, ulong, 0); | |
18 | MODULE_PARM_DESC(read_far, " Offset of a 32-bit read within 8 MB " | |
19 | "(default: 0x400100)."); | |
8b7d89d0 | 20 | |
fab852aa PP |
21 | static unsigned v16(unsigned i) |
22 | { | |
23 | return i * 12 + 7; | |
24 | } | |
25 | ||
26 | static unsigned v32(unsigned i) | |
27 | { | |
28 | return i * 212371 + 13; | |
29 | } | |
30 | ||
8b7d89d0 PP |
31 | static void do_write_test(void __iomem *p) |
32 | { | |
33 | unsigned int i; | |
3c355863 | 34 | pr_info("write test.\n"); |
9e57fb35 | 35 | mmiotrace_printk("Write test.\n"); |
fab852aa | 36 | |
8b7d89d0 PP |
37 | for (i = 0; i < 256; i++) |
38 | iowrite8(i, p + i); | |
fab852aa | 39 | |
8b7d89d0 | 40 | for (i = 1024; i < (5 * 1024); i += 2) |
fab852aa PP |
41 | iowrite16(v16(i), p + i); |
42 | ||
8b7d89d0 | 43 | for (i = (5 * 1024); i < (16 * 1024); i += 4) |
fab852aa | 44 | iowrite32(v32(i), p + i); |
8b7d89d0 PP |
45 | } |
46 | ||
47 | static void do_read_test(void __iomem *p) | |
48 | { | |
49 | unsigned int i; | |
fab852aa | 50 | unsigned errs[3] = { 0 }; |
3c355863 | 51 | pr_info("read test.\n"); |
9e57fb35 | 52 | mmiotrace_printk("Read test.\n"); |
fab852aa | 53 | |
8b7d89d0 | 54 | for (i = 0; i < 256; i++) |
fab852aa PP |
55 | if (ioread8(p + i) != i) |
56 | ++errs[0]; | |
57 | ||
8b7d89d0 | 58 | for (i = 1024; i < (5 * 1024); i += 2) |
fab852aa PP |
59 | if (ioread16(p + i) != v16(i)) |
60 | ++errs[1]; | |
61 | ||
8b7d89d0 | 62 | for (i = (5 * 1024); i < (16 * 1024); i += 4) |
fab852aa PP |
63 | if (ioread32(p + i) != v32(i)) |
64 | ++errs[2]; | |
65 | ||
66 | mmiotrace_printk("Read errors: 8-bit %d, 16-bit %d, 32-bit %d.\n", | |
67 | errs[0], errs[1], errs[2]); | |
8b7d89d0 PP |
68 | } |
69 | ||
5ff93697 PP |
70 | static void do_read_far_test(void __iomem *p) |
71 | { | |
3c355863 | 72 | pr_info("read far test.\n"); |
5ff93697 PP |
73 | mmiotrace_printk("Read far test.\n"); |
74 | ||
75 | ioread32(p + read_far); | |
76 | } | |
77 | ||
78 | static void do_test(unsigned long size) | |
8b7d89d0 | 79 | { |
5ff93697 | 80 | void __iomem *p = ioremap_nocache(mmio_address, size); |
8b7d89d0 | 81 | if (!p) { |
3c355863 | 82 | pr_err("could not ioremap, aborting.\n"); |
8b7d89d0 PP |
83 | return; |
84 | } | |
9e57fb35 | 85 | mmiotrace_printk("ioremap returned %p.\n", p); |
8b7d89d0 PP |
86 | do_write_test(p); |
87 | do_read_test(p); | |
5ff93697 PP |
88 | if (read_far && read_far < size - 4) |
89 | do_read_far_test(p); | |
d61fc448 | 90 | iounmap(p); |
8b7d89d0 PP |
91 | } |
92 | ||
8b8f79b9 MS |
93 | /* |
94 | * Tests how mmiotrace behaves in face of multiple ioremap / iounmaps in | |
95 | * a short time. We had a bug in deferred freeing procedure which tried | |
96 | * to free this region multiple times (ioremap can reuse the same address | |
97 | * for many mappings). | |
98 | */ | |
99 | static void do_test_bulk_ioremapping(void) | |
100 | { | |
101 | void __iomem *p; | |
102 | int i; | |
103 | ||
104 | for (i = 0; i < 10; ++i) { | |
105 | p = ioremap_nocache(mmio_address, PAGE_SIZE); | |
106 | if (p) | |
107 | iounmap(p); | |
108 | } | |
109 | ||
110 | /* Force freeing. If it will crash we will know why. */ | |
111 | synchronize_rcu(); | |
112 | } | |
113 | ||
8b7d89d0 PP |
114 | static int __init init(void) |
115 | { | |
5ff93697 PP |
116 | unsigned long size = (read_far) ? (8 << 20) : (16 << 10); |
117 | ||
8b7d89d0 | 118 | if (mmio_address == 0) { |
3c355863 JP |
119 | pr_err("you have to use the module argument mmio_address.\n"); |
120 | pr_err("DO NOT LOAD THIS MODULE UNLESS YOU REALLY KNOW WHAT YOU ARE DOING!\n"); | |
8b7d89d0 PP |
121 | return -ENXIO; |
122 | } | |
123 | ||
3c355863 JP |
124 | pr_warning("WARNING: mapping %lu kB @ 0x%08lx in PCI address space, " |
125 | "and writing 16 kB of rubbish in there.\n", | |
126 | size >> 10, mmio_address); | |
5ff93697 | 127 | do_test(size); |
8b8f79b9 | 128 | do_test_bulk_ioremapping(); |
3c355863 | 129 | pr_info("All done.\n"); |
8b7d89d0 PP |
130 | return 0; |
131 | } | |
132 | ||
133 | static void __exit cleanup(void) | |
134 | { | |
3c355863 | 135 | pr_debug("unloaded.\n"); |
8b7d89d0 PP |
136 | } |
137 | ||
138 | module_init(init); | |
139 | module_exit(cleanup); | |
140 | MODULE_LICENSE("GPL"); |