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// SPDX-License-Identifier: GPL-2.0-only
/*
* Intel MIC Platform Software Stack (MPSS)
*
* Copyright(c) 2016 Intel Corporation.
*
* Intel Virtio Over PCIe (VOP) Bus driver.
*/
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/idr.h>
#include <linux/dma-map-ops.h>
#include "vop_bus.h"
static ssize_t device_show(struct device *d,
struct device_attribute *attr, char *buf)
{
struct vop_device *dev = dev_to_vop(d);
return sprintf(buf, "0x%04x\n", dev->id.device);
}
static DEVICE_ATTR_RO(device);
static ssize_t vendor_show(struct device *d,
struct device_attribute *attr, char *buf)
{
struct vop_device *dev = dev_to_vop(d);
return sprintf(buf, "0x%04x\n", dev->id.vendor);
}
static DEVICE_ATTR_RO(vendor);
static ssize_t modalias_show(struct device *d,
struct device_attribute *attr, char *buf)
{
struct vop_device *dev = dev_to_vop(d);
return sprintf(buf, "vop:d%08Xv%08X\n",
dev->id.device, dev->id.vendor);
}
static DEVICE_ATTR_RO(modalias);
static struct attribute *vop_dev_attrs[] = {
&dev_attr_device.attr,
&dev_attr_vendor.attr,
&dev_attr_modalias.attr,
NULL,
};
ATTRIBUTE_GROUPS(vop_dev);
static inline int vop_id_match(const struct vop_device *dev,
const struct vop_device_id *id)
{
if (id->device != dev->id.device && id->device != VOP_DEV_ANY_ID)
return 0;
return id->vendor == VOP_DEV_ANY_ID || id->vendor == dev->id.vendor;
}
/*
* This looks through all the IDs a driver claims to support. If any of them
* match, we return 1 and the kernel will call vop_dev_probe().
*/
static int vop_dev_match(struct device *dv, struct device_driver *dr)
{
unsigned int i;
struct vop_device *dev = dev_to_vop(dv);
const struct vop_device_id *ids;
ids = drv_to_vop(dr)->id_table;
for (i = 0; ids[i].device; i++)
if (vop_id_match(dev, &ids[i]))
return 1;
return 0;
}
static int vop_uevent(struct device *dv, struct kobj_uevent_env *env)
{
struct vop_device *dev = dev_to_vop(dv);
return add_uevent_var(env, "MODALIAS=vop:d%08Xv%08X",
dev->id.device, dev->id.vendor);
}
static int vop_dev_probe(struct device *d)
{
struct vop_device *dev = dev_to_vop(d);
struct vop_driver *drv = drv_to_vop(dev->dev.driver);
return drv->probe(dev);
}
static int vop_dev_remove(struct device *d)
{
struct vop_device *dev = dev_to_vop(d);
struct vop_driver *drv = drv_to_vop(dev->dev.driver);
drv->remove(dev);
return 0;
}
static struct bus_type vop_bus = {
.name = "vop_bus",
.match = vop_dev_match,
.dev_groups = vop_dev_groups,
.uevent = vop_uevent,
.probe = vop_dev_probe,
.remove = vop_dev_remove,
};
int vop_register_driver(struct vop_driver *driver)
{
driver->driver.bus = &vop_bus;
return driver_register(&driver->driver);
}
EXPORT_SYMBOL_GPL(vop_register_driver);
void vop_unregister_driver(struct vop_driver *driver)
{
driver_unregister(&driver->driver);
}
EXPORT_SYMBOL_GPL(vop_unregister_driver);
static void vop_release_dev(struct device *d)
{
struct vop_device *dev = dev_to_vop(d);
kfree(dev);
}
struct vop_device *
vop_register_device(struct device *pdev, int id,
const struct dma_map_ops *dma_ops,
struct vop_hw_ops *hw_ops, u8 dnode, struct mic_mw *aper,
struct dma_chan *chan)
{
int ret;
struct vop_device *vdev;
vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
if (!vdev)
return ERR_PTR(-ENOMEM);
vdev->dev.parent = pdev;
vdev->id.device = id;
vdev->id.vendor = VOP_DEV_ANY_ID;
vdev->dev.dma_ops = dma_ops;
vdev->dev.dma_mask = &vdev->dev.coherent_dma_mask;
dma_set_mask(&vdev->dev, DMA_BIT_MASK(64));
vdev->dev.release = vop_release_dev;
vdev->hw_ops = hw_ops;
vdev->dev.bus = &vop_bus;
vdev->dnode = dnode;
vdev->aper = aper;
vdev->dma_ch = chan;
vdev->index = dnode - 1;
dev_set_name(&vdev->dev, "vop-dev%u", vdev->index);
/*
* device_register() causes the bus infrastructure to look for a
* matching driver.
*/
ret = device_register(&vdev->dev);
if (ret)
goto free_vdev;
return vdev;
free_vdev:
put_device(&vdev->dev);
return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(vop_register_device);
void vop_unregister_device(struct vop_device *dev)
{
device_unregister(&dev->dev);
}
EXPORT_SYMBOL_GPL(vop_unregister_device);
static int __init vop_init(void)
{
return bus_register(&vop_bus);
}
static void __exit vop_exit(void)
{
bus_unregister(&vop_bus);
}
core_initcall(vop_init);
module_exit(vop_exit);
MODULE_AUTHOR("Intel Corporation");
MODULE_DESCRIPTION("Intel(R) VOP Bus driver");
MODULE_LICENSE("GPL v2");
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