2 * Written by Pekka Paalanen, 2008 <pq@iki.fi>
4 #include <linux/module.h>
7 #define MODULE_NAME "testmmiotrace"
9 static unsigned long mmio_address
;
10 module_param(mmio_address
, ulong
, 0);
11 MODULE_PARM_DESC(mmio_address
, "Start address of the mapping of 16 kB.");
13 static void do_write_test(void __iomem
*p
)
16 for (i
= 0; i
< 256; i
++)
18 for (i
= 1024; i
< (5 * 1024); i
+= 2)
19 iowrite16(i
* 12 + 7, p
+ i
);
20 for (i
= (5 * 1024); i
< (16 * 1024); i
+= 4)
21 iowrite32(i
* 212371 + 13, p
+ i
);
24 static void do_read_test(void __iomem
*p
)
27 for (i
= 0; i
< 256; i
++)
29 for (i
= 1024; i
< (5 * 1024); i
+= 2)
31 for (i
= (5 * 1024); i
< (16 * 1024); i
+= 4)
35 static void do_test(void)
37 void __iomem
*p
= ioremap_nocache(mmio_address
, 0x4000);
39 pr_err(MODULE_NAME
": could not ioremap, aborting.\n");
47 static int __init
init(void)
49 if (mmio_address
== 0) {
50 pr_err(MODULE_NAME
": you have to use the module argument "
52 pr_err(MODULE_NAME
": DO NOT LOAD THIS MODULE UNLESS"
53 " YOU REALLY KNOW WHAT YOU ARE DOING!\n");
57 pr_warning(MODULE_NAME
": WARNING: mapping 16 kB @ 0x%08lx "
58 "in PCI address space, and writing "
59 "rubbish in there.\n", mmio_address
);
64 static void __exit
cleanup(void)
66 pr_debug(MODULE_NAME
": unloaded.\n");
71 MODULE_LICENSE("GPL");
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