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/*
* Intel MIC Platform Software Stack (MPSS)
*
* Copyright(c) 2014 Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* Intel Symmetric Communications Interface Bus driver.
*/
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/idr.h>
#include <linux/dma-mapping.h>
#include "scif_bus.h"
static ssize_t device_show(struct device *d,
struct device_attribute *attr, char *buf)
{
struct scif_hw_dev *dev = dev_to_scif(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 scif_hw_dev *dev = dev_to_scif(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 scif_hw_dev *dev = dev_to_scif(d);
return sprintf(buf, "scif:d%08Xv%08X\n",
dev->id.device, dev->id.vendor);
}
static DEVICE_ATTR_RO(modalias);
static struct attribute *scif_dev_attrs[] = {
&dev_attr_device.attr,
&dev_attr_vendor.attr,
&dev_attr_modalias.attr,
NULL,
};
ATTRIBUTE_GROUPS(scif_dev);
static inline int scif_id_match(const struct scif_hw_dev *dev,
const struct scif_hw_dev_id *id)
{
if (id->device != dev->id.device && id->device != SCIF_DEV_ANY_ID)
return 0;
return id->vendor == SCIF_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 scif_dev_probe().
*/
static int scif_dev_match(struct device *dv, struct device_driver *dr)
{
unsigned int i;
struct scif_hw_dev *dev = dev_to_scif(dv);
const struct scif_hw_dev_id *ids;
ids = drv_to_scif(dr)->id_table;
for (i = 0; ids[i].device; i++)
if (scif_id_match(dev, &ids[i]))
return 1;
return 0;
}
static int scif_uevent(struct device *dv, struct kobj_uevent_env *env)
{
struct scif_hw_dev *dev = dev_to_scif(dv);
return add_uevent_var(env, "MODALIAS=scif:d%08Xv%08X",
dev->id.device, dev->id.vendor);
}
static int scif_dev_probe(struct device *d)
{
struct scif_hw_dev *dev = dev_to_scif(d);
struct scif_driver *drv = drv_to_scif(dev->dev.driver);
return drv->probe(dev);
}
static int scif_dev_remove(struct device *d)
{
struct scif_hw_dev *dev = dev_to_scif(d);
struct scif_driver *drv = drv_to_scif(dev->dev.driver);
drv->remove(dev);
return 0;
}
static struct bus_type scif_bus = {
.name = "scif_bus",
.match = scif_dev_match,
.dev_groups = scif_dev_groups,
.uevent = scif_uevent,
.probe = scif_dev_probe,
.remove = scif_dev_remove,
};
int scif_register_driver(struct scif_driver *driver)
{
driver->driver.bus = &scif_bus;
return driver_register(&driver->driver);
}
EXPORT_SYMBOL_GPL(scif_register_driver);
void scif_unregister_driver(struct scif_driver *driver)
{
driver_unregister(&driver->driver);
}
EXPORT_SYMBOL_GPL(scif_unregister_driver);
static void scif_release_dev(struct device *d)
{
struct scif_hw_dev *sdev = dev_to_scif(d);
kfree(sdev);
}
struct scif_hw_dev *
scif_register_device(struct device *pdev, int id, struct dma_map_ops *dma_ops,
struct scif_hw_ops *hw_ops, u8 dnode, u8 snode,
struct mic_mw *mmio, struct mic_mw *aper, void *dp,
void __iomem *rdp, struct dma_chan **chan, int num_chan)
{
int ret;
struct scif_hw_dev *sdev;
sdev = kzalloc(sizeof(*sdev), GFP_KERNEL);
if (!sdev)
return ERR_PTR(-ENOMEM);
sdev->dev.parent = pdev;
sdev->id.device = id;
sdev->id.vendor = SCIF_DEV_ANY_ID;
sdev->dev.archdata.dma_ops = dma_ops;
sdev->dev.release = scif_release_dev;
sdev->hw_ops = hw_ops;
sdev->dnode = dnode;
sdev->snode = snode;
dev_set_drvdata(&sdev->dev, sdev);
sdev->dev.bus = &scif_bus;
sdev->mmio = mmio;
sdev->aper = aper;
sdev->dp = dp;
sdev->rdp = rdp;
sdev->dev.dma_mask = &sdev->dev.coherent_dma_mask;
dma_set_mask(&sdev->dev, DMA_BIT_MASK(64));
sdev->dma_ch = chan;
sdev->num_dma_ch = num_chan;
dev_set_name(&sdev->dev, "scif-dev%u", sdev->dnode);
/*
* device_register() causes the bus infrastructure to look for a
* matching driver.
*/
ret = device_register(&sdev->dev);
if (ret)
goto free_sdev;
return sdev;
free_sdev:
kfree(sdev);
return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(scif_register_device);
void scif_unregister_device(struct scif_hw_dev *sdev)
{
device_unregister(&sdev->dev);
}
EXPORT_SYMBOL_GPL(scif_unregister_device);
static int __init scif_init(void)
{
return bus_register(&scif_bus);
}
static void __exit scif_exit(void)
{
bus_unregister(&scif_bus);
}
core_initcall(scif_init);
module_exit(scif_exit);
MODULE_AUTHOR("Intel Corporation");
MODULE_DESCRIPTION("Intel(R) SCIF Bus driver");
MODULE_LICENSE("GPL v2");
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