2 * Written by Pekka Paalanen, 2008-2009 <pq@iki.fi>
4 #include <linux/module.h>
6 #include <linux/mmiotrace.h>
8 #define MODULE_NAME "testmmiotrace"
10 static unsigned long mmio_address;
11 module_param(mmio_address, ulong, 0);
12 MODULE_PARM_DESC(mmio_address, "Start address of the mapping of 16 kB.");
14 static unsigned v16(unsigned i)
19 static unsigned v32(unsigned i)
21 return i * 212371 + 13;
24 static void do_write_test(void __iomem *p)
27 mmiotrace_printk("Write test.\n");
29 for (i = 0; i < 256; i++)
32 for (i = 1024; i < (5 * 1024); i += 2)
33 iowrite16(v16(i), p + i);
35 for (i = (5 * 1024); i < (16 * 1024); i += 4)
36 iowrite32(v32(i), p + i);
39 static void do_read_test(void __iomem *p)
42 unsigned errs[3] = { 0 };
43 mmiotrace_printk("Read test.\n");
45 for (i = 0; i < 256; i++)
46 if (ioread8(p + i) != i)
49 for (i = 1024; i < (5 * 1024); i += 2)
50 if (ioread16(p + i) != v16(i))
53 for (i = (5 * 1024); i < (16 * 1024); i += 4)
54 if (ioread32(p + i) != v32(i))
57 mmiotrace_printk("Read errors: 8-bit %d, 16-bit %d, 32-bit %d.\n",
58 errs[0], errs[1], errs[2]);
61 static void do_test(void)
63 void __iomem *p = ioremap_nocache(mmio_address, 0x4000);
65 pr_err(MODULE_NAME ": could not ioremap, aborting.\n");
68 mmiotrace_printk("ioremap returned %p.\n", p);
74 static int __init init(void)
76 if (mmio_address == 0) {
77 pr_err(MODULE_NAME ": you have to use the module argument "
79 pr_err(MODULE_NAME ": DO NOT LOAD THIS MODULE UNLESS"
80 " YOU REALLY KNOW WHAT YOU ARE DOING!\n");
84 pr_warning(MODULE_NAME ": WARNING: mapping 16 kB @ 0x%08lx "
85 "in PCI address space, and writing "
86 "rubbish in there.\n", mmio_address);
91 static void __exit cleanup(void)
93 pr_debug(MODULE_NAME ": unloaded.\n");
98 MODULE_LICENSE("GPL");