2 * Written by Pekka Paalanen, 2008 <pq@iki.fi>
4 #include <linux/module.h>
7 extern void __iomem *ioremap_nocache_trace(unsigned long offset,
9 extern void iounmap_trace(volatile void __iomem *addr);
11 #define MODULE_NAME "testmmiotrace"
13 static unsigned long mmio_address;
14 module_param(mmio_address, ulong, 0);
15 MODULE_PARM_DESC(mmio_address, "Start address of the mapping of 16 kB.");
17 static void do_write_test(void __iomem *p)
20 for (i = 0; i < 256; i++)
22 for (i = 1024; i < (5 * 1024); i += 2)
23 iowrite16(i * 12 + 7, p + i);
24 for (i = (5 * 1024); i < (16 * 1024); i += 4)
25 iowrite32(i * 212371 + 13, p + i);
28 static void do_read_test(void __iomem *p)
31 volatile unsigned int v;
32 for (i = 0; i < 256; i++)
34 for (i = 1024; i < (5 * 1024); i += 2)
36 for (i = (5 * 1024); i < (16 * 1024); i += 4)
40 static void do_test(void)
42 void __iomem *p = ioremap_nocache_trace(mmio_address, 0x4000);
44 pr_err(MODULE_NAME ": could not ioremap, aborting.\n");
52 static int __init init(void)
54 if (mmio_address == 0) {
55 pr_err(MODULE_NAME ": you have to use the module argument "
57 pr_err(MODULE_NAME ": DO NOT LOAD THIS MODULE UNLESS"
58 " YOU REALLY KNOW WHAT YOU ARE DOING!\n");
62 pr_warning(MODULE_NAME ": WARNING: mapping 16 kB @ 0x%08lx "
63 "in PCI address space, and writing "
64 "rubbish in there.\n", mmio_address);
69 static void __exit cleanup(void)
71 pr_debug(MODULE_NAME ": unloaded.\n");
76 MODULE_LICENSE("GPL");