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author | Pekka Paalanen <pq@iki.fi> | 2008-05-12 21:20:59 +0200 |
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committer | Thomas Gleixner <tglx@linutronix.de> | 2008-05-24 11:25:37 +0200 |
commit | ff3a3e9ba5e4273a8bc10570adab4a390fb90757 (patch) | |
tree | 63fd9b1c69ba53c514b9b2eb59ee17f10d6511de /arch/x86/mm/testmmiotrace.c | |
parent | 49023168261a7f9a2fd4a1ca1adbfea922556015 (diff) | |
download | linux-ff3a3e9ba5e4273a8bc10570adab4a390fb90757.tar.gz linux-ff3a3e9ba5e4273a8bc10570adab4a390fb90757.tar.bz2 linux-ff3a3e9ba5e4273a8bc10570adab4a390fb90757.zip |
x86 mmiotrace: move files into arch/x86/mm/.
Signed-off-by: Pekka Paalanen <pq@iki.fi>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/mm/testmmiotrace.c')
-rw-r--r-- | arch/x86/mm/testmmiotrace.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/arch/x86/mm/testmmiotrace.c b/arch/x86/mm/testmmiotrace.c new file mode 100644 index 000000000000..cfa60b227c8d --- /dev/null +++ b/arch/x86/mm/testmmiotrace.c @@ -0,0 +1,71 @@ +/* + * Written by Pekka Paalanen, 2008 <pq@iki.fi> + */ +#include <linux/module.h> +#include <asm/io.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; + 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; + 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; + } + 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"); |