https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 57f8f7b60db6f1ed2c6918ab9230c4623a9dbe37 authored by Linus Torvalds on 24 October 2008, 03:06:52 UTC
Linux 2.6.28-rc1
Linux 2.6.28-rc1
Tip revision: 57f8f7b
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");