[deliverable/linux.git] / arch / x86 / mm / testmmiotrace.c

/*
 * Written by Pekka Paalanen, 2008 <pq@iki.fi>
 */
#include <linux/module.h>
#include <linux/io.h>
#include <linux/mmiotrace.h>

#define MODULE_NAME "testmmiotrace"

static unsigned long mmio_address;
module_param(mmio_address, ulong, 0);
MODULE_PARM_DESC(mmio_address, "Start address of the mapping of 16 kB.");

static void do_write_test(void __iomem *p)
{
	unsigned int i;
	mmiotrace_printk("Write test.\n");
	for (i = 0; i < 256; i++)
		iowrite8(i, p + i);
	for (i = 1024; i < (5 * 1024); i += 2)
		iowrite16(i * 12 + 7, p + i);
	for (i = (5 * 1024); i < (16 * 1024); i += 4)
		iowrite32(i * 212371 + 13, p + i);
}

static void do_read_test(void __iomem *p)
{
	unsigned int i;
	mmiotrace_printk("Read test.\n");
	for (i = 0; i < 256; i++)
		ioread8(p + i);
	for (i = 1024; i < (5 * 1024); i += 2)
		ioread16(p + i);
	for (i = (5 * 1024); i < (16 * 1024); i += 4)
		ioread32(p + i);
}

static void do_test(void)
{
	void __iomem *p = ioremap_nocache(mmio_address, 0x4000);
	if (!p) {
		pr_err(MODULE_NAME ": could not ioremap, aborting.\n");
		return;
	}
	mmiotrace_printk("ioremap returned %p.\n", p);
	do_write_test(p);
	do_read_test(p);
	iounmap(p);
}

static int __init init(void)
{
	if (mmio_address == 0) {
		pr_err(MODULE_NAME ": you have to use the module argument "
							"mmio_address.\n");
		pr_err(MODULE_NAME ": DO NOT LOAD THIS MODULE UNLESS"
				" YOU REALLY KNOW WHAT YOU ARE DOING!\n");
		return -ENXIO;
	}

	pr_warning(MODULE_NAME ": WARNING: mapping 16 kB @ 0x%08lx "
					"in PCI address space, and writing "
					"rubbish in there.\n", mmio_address);
	do_test();
	return 0;
}

static void __exit cleanup(void)
{
	pr_debug(MODULE_NAME ": unloaded.\n");
}

module_init(init);
module_exit(cleanup);
MODULE_LICENSE("GPL");
Commit	Line	Data
8b7d89d0 PP	1	/*
	2	* Written by Pekka Paalanen, 2008 <pq@iki.fi>
	3	*/
	4	#include <linux/module.h>
970e6fa0	5	#include <linux/io.h>
9e57fb35	6	#include <linux/mmiotrace.h>
8b7d89d0	7
8b7d89d0 PP	8	#define MODULE_NAME "testmmiotrace"
	9
	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.");
	13
	14	static void do_write_test(void __iomem *p)
	15	{
	16	unsigned int i;
9e57fb35	17	mmiotrace_printk("Write test.\n");
8b7d89d0 PP	18	for (i = 0; i < 256; i++)
	19	iowrite8(i, p + i);
	20	for (i = 1024; i < (5 * 1024); i += 2)
	21	iowrite16(i * 12 + 7, p + i);
	22	for (i = (5 * 1024); i < (16 * 1024); i += 4)
	23	iowrite32(i * 212371 + 13, p + i);
	24	}
	25
	26	static void do_read_test(void __iomem *p)
	27	{
	28	unsigned int i;
9e57fb35	29	mmiotrace_printk("Read test.\n");
8b7d89d0	30	for (i = 0; i < 256; i++)
d61fc448	31	ioread8(p + i);
8b7d89d0	32	for (i = 1024; i < (5 * 1024); i += 2)
d61fc448	33	ioread16(p + i);
8b7d89d0	34	for (i = (5 * 1024); i < (16 * 1024); i += 4)
d61fc448	35	ioread32(p + i);
8b7d89d0 PP	36	}
	37
	38	static void do_test(void)
	39	{
d61fc448	40	void __iomem *p = ioremap_nocache(mmio_address, 0x4000);
8b7d89d0	41	if (!p) {
0fd0e3da	42	pr_err(MODULE_NAME ": could not ioremap, aborting.\n");
8b7d89d0 PP	43	return;
8b7d89d0 PP	44	}
9e57fb35	45	mmiotrace_printk("ioremap returned %p.\n", p);
8b7d89d0 PP	46	do_write_test(p);
8b7d89d0 PP	47	do_read_test(p);
d61fc448	48	iounmap(p);
8b7d89d0 PP	49	}
	50
	51	static int __init init(void)
	52	{
	53	if (mmio_address == 0) {
0fd0e3da PP	54	pr_err(MODULE_NAME ": you have to use the module argument "
	55	"mmio_address.\n");
	56	pr_err(MODULE_NAME ": DO NOT LOAD THIS MODULE UNLESS"
8b7d89d0 PP	57	" YOU REALLY KNOW WHAT YOU ARE DOING!\n");
	58	return -ENXIO;
	59	}
	60
0fd0e3da	61	pr_warning(MODULE_NAME ": WARNING: mapping 16 kB @ 0x%08lx "
8b7d89d0 PP	62	"in PCI address space, and writing "
	63	"rubbish in there.\n", mmio_address);
	64	do_test();
	65	return 0;
	66	}
	67
	68	static void __exit cleanup(void)
	69	{
0fd0e3da	70	pr_debug(MODULE_NAME ": unloaded.\n");
8b7d89d0 PP	71	}
	72
	73	module_init(init);
	74	module_exit(cleanup);
	75	MODULE_LICENSE("GPL");