66 lines
1.5 KiB
C
66 lines
1.5 KiB
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
#include <linux/platform_device.h>
|
||
|
|
#include <linux/memregion.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/pfn_t.h>
|
||
|
|
#include "../bus.h"
|
||
|
|
|
||
|
|
static bool region_idle;
|
||
|
|
module_param_named(region_idle, region_idle, bool, 0644);
|
||
|
|
|
||
|
|
static int dax_hmem_probe(struct platform_device *pdev)
|
||
|
|
{
|
||
|
|
struct device *dev = &pdev->dev;
|
||
|
|
struct dax_region *dax_region;
|
||
|
|
struct memregion_info *mri;
|
||
|
|
struct dev_dax_data data;
|
||
|
|
struct dev_dax *dev_dax;
|
||
|
|
struct resource *res;
|
||
|
|
struct range range;
|
||
|
|
|
||
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||
|
|
if (!res)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
mri = dev->platform_data;
|
||
|
|
range.start = res->start;
|
||
|
|
range.end = res->end;
|
||
|
|
dax_region = alloc_dax_region(dev, pdev->id, &range, mri->target_node,
|
||
|
|
PMD_SIZE, 0);
|
||
|
|
if (!dax_region)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
data = (struct dev_dax_data) {
|
||
|
|
.dax_region = dax_region,
|
||
|
|
.id = -1,
|
||
|
|
.size = region_idle ? 0 : resource_size(res),
|
||
|
|
};
|
||
|
|
dev_dax = devm_create_dev_dax(&data);
|
||
|
|
if (IS_ERR(dev_dax))
|
||
|
|
return PTR_ERR(dev_dax);
|
||
|
|
|
||
|
|
/* child dev_dax instances now own the lifetime of the dax_region */
|
||
|
|
dax_region_put(dax_region);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int dax_hmem_remove(struct platform_device *pdev)
|
||
|
|
{
|
||
|
|
/* devm handles teardown */
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct platform_driver dax_hmem_driver = {
|
||
|
|
.probe = dax_hmem_probe,
|
||
|
|
.remove = dax_hmem_remove,
|
||
|
|
.driver = {
|
||
|
|
.name = "hmem",
|
||
|
|
},
|
||
|
|
};
|
||
|
|
|
||
|
|
module_platform_driver(dax_hmem_driver);
|
||
|
|
|
||
|
|
MODULE_ALIAS("platform:hmem*");
|
||
|
|
MODULE_LICENSE("GPL v2");
|
||
|
|
MODULE_AUTHOR("Intel Corporation");
|