352 lines
7.8 KiB
C
352 lines
7.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/**
|
|
* PCI Endpoint *Function* (EPF) library
|
|
*
|
|
* Copyright (C) 2017 Texas Instruments
|
|
* Author: Kishon Vijay Abraham I <kishon@ti.com>
|
|
*/
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/dma-mapping.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/module.h>
|
|
|
|
#include <linux/pci-epc.h>
|
|
#include <linux/pci-epf.h>
|
|
#include <linux/pci-ep-cfs.h>
|
|
|
|
static struct bus_type pci_epf_bus_type;
|
|
static const struct device_type pci_epf_type;
|
|
|
|
/**
|
|
* pci_epf_linkup() - Notify the function driver that EPC device has
|
|
* established a connection with the Root Complex.
|
|
* @epf: the EPF device bound to the EPC device which has established
|
|
* the connection with the host
|
|
*
|
|
* Invoke to notify the function driver that EPC device has established
|
|
* a connection with the Root Complex.
|
|
*/
|
|
void pci_epf_linkup(struct pci_epf *epf)
|
|
{
|
|
if (!epf->driver) {
|
|
dev_WARN(&epf->dev, "epf device not bound to driver\n");
|
|
return;
|
|
}
|
|
|
|
epf->driver->ops->linkup(epf);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_epf_linkup);
|
|
|
|
/**
|
|
* pci_epf_unbind() - Notify the function driver that the binding between the
|
|
* EPF device and EPC device has been lost
|
|
* @epf: the EPF device which has lost the binding with the EPC device
|
|
*
|
|
* Invoke to notify the function driver that the binding between the EPF device
|
|
* and EPC device has been lost.
|
|
*/
|
|
void pci_epf_unbind(struct pci_epf *epf)
|
|
{
|
|
if (!epf->driver) {
|
|
dev_WARN(&epf->dev, "epf device not bound to driver\n");
|
|
return;
|
|
}
|
|
|
|
epf->driver->ops->unbind(epf);
|
|
module_put(epf->driver->owner);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_epf_unbind);
|
|
|
|
/**
|
|
* pci_epf_bind() - Notify the function driver that the EPF device has been
|
|
* bound to a EPC device
|
|
* @epf: the EPF device which has been bound to the EPC device
|
|
*
|
|
* Invoke to notify the function driver that it has been bound to a EPC device
|
|
*/
|
|
int pci_epf_bind(struct pci_epf *epf)
|
|
{
|
|
if (!epf->driver) {
|
|
dev_WARN(&epf->dev, "epf device not bound to driver\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!try_module_get(epf->driver->owner))
|
|
return -EAGAIN;
|
|
|
|
return epf->driver->ops->bind(epf);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_epf_bind);
|
|
|
|
/**
|
|
* pci_epf_free_space() - free the allocated PCI EPF register space
|
|
* @addr: the virtual address of the PCI EPF register space
|
|
* @bar: the BAR number corresponding to the register space
|
|
*
|
|
* Invoke to free the allocated PCI EPF register space.
|
|
*/
|
|
void pci_epf_free_space(struct pci_epf *epf, void *addr, enum pci_barno bar)
|
|
{
|
|
struct device *dev = epf->epc->dev.parent;
|
|
|
|
if (!addr)
|
|
return;
|
|
|
|
dma_free_coherent(dev, epf->bar[bar].size, addr,
|
|
epf->bar[bar].phys_addr);
|
|
|
|
epf->bar[bar].phys_addr = 0;
|
|
epf->bar[bar].size = 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_epf_free_space);
|
|
|
|
/**
|
|
* pci_epf_alloc_space() - allocate memory for the PCI EPF register space
|
|
* @size: the size of the memory that has to be allocated
|
|
* @bar: the BAR number corresponding to the allocated register space
|
|
*
|
|
* Invoke to allocate memory for the PCI EPF register space.
|
|
*/
|
|
void *pci_epf_alloc_space(struct pci_epf *epf, size_t size, enum pci_barno bar)
|
|
{
|
|
void *space;
|
|
struct device *dev = epf->epc->dev.parent;
|
|
dma_addr_t phys_addr;
|
|
|
|
if (size < 128)
|
|
size = 128;
|
|
size = roundup_pow_of_two(size);
|
|
|
|
space = dma_alloc_coherent(dev, size, &phys_addr, GFP_KERNEL);
|
|
if (!space) {
|
|
dev_err(dev, "failed to allocate mem space\n");
|
|
return NULL;
|
|
}
|
|
|
|
epf->bar[bar].phys_addr = phys_addr;
|
|
epf->bar[bar].size = size;
|
|
|
|
return space;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_epf_alloc_space);
|
|
|
|
/**
|
|
* pci_epf_unregister_driver() - unregister the PCI EPF driver
|
|
* @driver: the PCI EPF driver that has to be unregistered
|
|
*
|
|
* Invoke to unregister the PCI EPF driver.
|
|
*/
|
|
void pci_epf_unregister_driver(struct pci_epf_driver *driver)
|
|
{
|
|
pci_ep_cfs_remove_epf_group(driver->group);
|
|
driver_unregister(&driver->driver);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_epf_unregister_driver);
|
|
|
|
/**
|
|
* __pci_epf_register_driver() - register a new PCI EPF driver
|
|
* @driver: structure representing PCI EPF driver
|
|
* @owner: the owner of the module that registers the PCI EPF driver
|
|
*
|
|
* Invoke to register a new PCI EPF driver.
|
|
*/
|
|
int __pci_epf_register_driver(struct pci_epf_driver *driver,
|
|
struct module *owner)
|
|
{
|
|
int ret;
|
|
|
|
if (!driver->ops)
|
|
return -EINVAL;
|
|
|
|
if (!driver->ops->bind || !driver->ops->unbind || !driver->ops->linkup)
|
|
return -EINVAL;
|
|
|
|
driver->driver.bus = &pci_epf_bus_type;
|
|
driver->driver.owner = owner;
|
|
|
|
ret = driver_register(&driver->driver);
|
|
if (ret)
|
|
return ret;
|
|
|
|
driver->group = pci_ep_cfs_add_epf_group(driver->driver.name);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__pci_epf_register_driver);
|
|
|
|
/**
|
|
* pci_epf_destroy() - destroy the created PCI EPF device
|
|
* @epf: the PCI EPF device that has to be destroyed.
|
|
*
|
|
* Invoke to destroy the PCI EPF device created by invoking pci_epf_create().
|
|
*/
|
|
void pci_epf_destroy(struct pci_epf *epf)
|
|
{
|
|
device_unregister(&epf->dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_epf_destroy);
|
|
|
|
/**
|
|
* pci_epf_create() - create a new PCI EPF device
|
|
* @name: the name of the PCI EPF device. This name will be used to bind the
|
|
* the EPF device to a EPF driver
|
|
*
|
|
* Invoke to create a new PCI EPF device by providing the name of the function
|
|
* device.
|
|
*/
|
|
struct pci_epf *pci_epf_create(const char *name)
|
|
{
|
|
int ret;
|
|
struct pci_epf *epf;
|
|
struct device *dev;
|
|
int len;
|
|
|
|
epf = kzalloc(sizeof(*epf), GFP_KERNEL);
|
|
if (!epf) {
|
|
ret = -ENOMEM;
|
|
goto err_ret;
|
|
}
|
|
|
|
len = strchrnul(name, '.') - name;
|
|
epf->name = kstrndup(name, len, GFP_KERNEL);
|
|
if (!epf->name) {
|
|
ret = -ENOMEM;
|
|
goto free_epf;
|
|
}
|
|
|
|
dev = &epf->dev;
|
|
device_initialize(dev);
|
|
dev->bus = &pci_epf_bus_type;
|
|
dev->type = &pci_epf_type;
|
|
|
|
ret = dev_set_name(dev, "%s", name);
|
|
if (ret)
|
|
goto put_dev;
|
|
|
|
ret = device_add(dev);
|
|
if (ret)
|
|
goto put_dev;
|
|
|
|
return epf;
|
|
|
|
put_dev:
|
|
put_device(dev);
|
|
kfree(epf->name);
|
|
|
|
free_epf:
|
|
kfree(epf);
|
|
|
|
err_ret:
|
|
return ERR_PTR(ret);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_epf_create);
|
|
|
|
const struct pci_epf_device_id *
|
|
pci_epf_match_device(const struct pci_epf_device_id *id, struct pci_epf *epf)
|
|
{
|
|
if (!id || !epf)
|
|
return NULL;
|
|
|
|
while (*id->name) {
|
|
if (strcmp(epf->name, id->name) == 0)
|
|
return id;
|
|
id++;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_epf_match_device);
|
|
|
|
static void pci_epf_dev_release(struct device *dev)
|
|
{
|
|
struct pci_epf *epf = to_pci_epf(dev);
|
|
|
|
kfree(epf->name);
|
|
kfree(epf);
|
|
}
|
|
|
|
static const struct device_type pci_epf_type = {
|
|
.release = pci_epf_dev_release,
|
|
};
|
|
|
|
static int
|
|
pci_epf_match_id(const struct pci_epf_device_id *id, const struct pci_epf *epf)
|
|
{
|
|
while (id->name[0]) {
|
|
if (strcmp(epf->name, id->name) == 0)
|
|
return true;
|
|
id++;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static int pci_epf_device_match(struct device *dev, struct device_driver *drv)
|
|
{
|
|
struct pci_epf *epf = to_pci_epf(dev);
|
|
struct pci_epf_driver *driver = to_pci_epf_driver(drv);
|
|
|
|
if (driver->id_table)
|
|
return pci_epf_match_id(driver->id_table, epf);
|
|
|
|
return !strcmp(epf->name, drv->name);
|
|
}
|
|
|
|
static int pci_epf_device_probe(struct device *dev)
|
|
{
|
|
struct pci_epf *epf = to_pci_epf(dev);
|
|
struct pci_epf_driver *driver = to_pci_epf_driver(dev->driver);
|
|
|
|
if (!driver->probe)
|
|
return -ENODEV;
|
|
|
|
epf->driver = driver;
|
|
|
|
return driver->probe(epf);
|
|
}
|
|
|
|
static int pci_epf_device_remove(struct device *dev)
|
|
{
|
|
int ret = 0;
|
|
struct pci_epf *epf = to_pci_epf(dev);
|
|
struct pci_epf_driver *driver = to_pci_epf_driver(dev->driver);
|
|
|
|
if (driver->remove)
|
|
ret = driver->remove(epf);
|
|
epf->driver = NULL;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct bus_type pci_epf_bus_type = {
|
|
.name = "pci-epf",
|
|
.match = pci_epf_device_match,
|
|
.probe = pci_epf_device_probe,
|
|
.remove = pci_epf_device_remove,
|
|
};
|
|
|
|
static int __init pci_epf_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = bus_register(&pci_epf_bus_type);
|
|
if (ret) {
|
|
pr_err("failed to register pci epf bus --> %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
module_init(pci_epf_init);
|
|
|
|
static void __exit pci_epf_exit(void)
|
|
{
|
|
bus_unregister(&pci_epf_bus_type);
|
|
}
|
|
module_exit(pci_epf_exit);
|
|
|
|
MODULE_DESCRIPTION("PCI EPF Library");
|
|
MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@ti.com>");
|
|
MODULE_LICENSE("GPL v2");
|