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/* SPDX-License-Identifier: GPL-2.0 */
/**
* PCI Endpoint *Function* (EPF) header file
*
* Copyright (C) 2017 Texas Instruments
* Author: Kishon Vijay Abraham I <kishon@ti.com>
*/
#ifndef __LINUX_PCI_EPF_H
#define __LINUX_PCI_EPF_H
#include <linux/configfs.h>
#include <linux/device.h>
#include <linux/mod_devicetable.h>
#include <linux/pci.h>
struct pci_epf;
enum pci_epc_interface_type;
enum pci_notify_event {
CORE_INIT,
LINK_UP,
};
enum pci_barno {
NO_BAR = -1,
BAR_0,
BAR_1,
BAR_2,
BAR_3,
BAR_4,
BAR_5,
};
/**
* struct pci_epf_header - represents standard configuration header
* @vendorid: identifies device manufacturer
* @deviceid: identifies a particular device
* @revid: specifies a device-specific revision identifier
* @progif_code: identifies a specific register-level programming interface
* @subclass_code: identifies more specifically the function of the device
* @baseclass_code: broadly classifies the type of function the device performs
* @cache_line_size: specifies the system cacheline size in units of DWORDs
* @subsys_vendor_id: vendor of the add-in card or subsystem
* @subsys_id: id specific to vendor
* @interrupt_pin: interrupt pin the device (or device function) uses
*/
struct pci_epf_header {
u16 vendorid;
u16 deviceid;
u8 revid;
u8 progif_code;
u8 subclass_code;
u8 baseclass_code;
u8 cache_line_size;
u16 subsys_vendor_id;
u16 subsys_id;
enum pci_interrupt_pin interrupt_pin;
};
/**
* struct pci_epf_ops - set of function pointers for performing EPF operations
* @bind: ops to perform when a EPC device has been bound to EPF device
* @unbind: ops to perform when a binding has been lost between a EPC device
* and EPF device
* @add_cfs: ops to initialize function specific configfs attributes
*/
struct pci_epf_ops {
int (*bind)(struct pci_epf *epf);
void (*unbind)(struct pci_epf *epf);
struct config_group *(*add_cfs)(struct pci_epf *epf,
struct config_group *group);
};
/**
* struct pci_epf_driver - represents the PCI EPF driver
* @probe: ops to perform when a new EPF device has been bound to the EPF driver
* @remove: ops to perform when the binding between the EPF device and EPF
* driver is broken
* @driver: PCI EPF driver
* @ops: set of function pointers for performing EPF operations
* @owner: the owner of the module that registers the PCI EPF driver
* @epf_group: list of configfs group corresponding to the PCI EPF driver
* @id_table: identifies EPF devices for probing
*/
struct pci_epf_driver {
int (*probe)(struct pci_epf *epf);
int (*remove)(struct pci_epf *epf);
struct device_driver driver;
struct pci_epf_ops *ops;
struct module *owner;
struct list_head epf_group;
const struct pci_epf_device_id *id_table;
};
#define to_pci_epf_driver(drv) (container_of((drv), struct pci_epf_driver, \
driver))
/**
* struct pci_epf_bar - represents the BAR of EPF device
* @phys_addr: physical address that should be mapped to the BAR
* @addr: virtual address corresponding to the @phys_addr
* @size: the size of the address space present in BAR
*/
struct pci_epf_bar {
dma_addr_t phys_addr;
void *addr;
size_t size;
enum pci_barno barno;
int flags;
};
/**
* struct pci_epf - represents the PCI EPF device
* @dev: the PCI EPF device
* @name: the name of the PCI EPF device
* @header: represents standard configuration header
* @bar: represents the BAR of EPF device
* @msi_interrupts: number of MSI interrupts required by this function
* @func_no: unique function number within this endpoint device
* @epc: the EPC device to which this EPF device is bound
* @driver: the EPF driver to which this EPF device is bound
* @list: to add pci_epf as a list of PCI endpoint functions to pci_epc
* @nb: notifier block to notify EPF of any EPC events (like linkup)
* @lock: mutex to protect pci_epf_ops
* @sec_epc: the secondary EPC device to which this EPF device is bound
* @sec_epc_list: to add pci_epf as list of PCI endpoint functions to secondary
* EPC device
* @sec_epc_bar: represents the BAR of EPF device associated with secondary EPC
* @sec_epc_func_no: unique (physical) function number within the secondary EPC
* @group: configfs group associated with the EPF device
*/
struct pci_epf {
struct device dev;
const char *name;
struct pci_epf_header *header;
struct pci_epf_bar bar[6];
u8 msi_interrupts;
u16 msix_interrupts;
u8 func_no;
struct pci_epc *epc;
struct pci_epf_driver *driver;
struct list_head list;
struct notifier_block nb;
/* mutex to protect against concurrent access of pci_epf_ops */
struct mutex lock;
/* Below members are to attach secondary EPC to an endpoint function */
struct pci_epc *sec_epc;
struct list_head sec_epc_list;
struct pci_epf_bar sec_epc_bar[6];
u8 sec_epc_func_no;
struct config_group *group;
};
/**
* struct pci_epf_msix_tbl - represents the MSIX table entry structure
* @msg_addr: Writes to this address will trigger MSIX interrupt in host
* @msg_data: Data that should be written to @msg_addr to trigger MSIX interrupt
* @vector_ctrl: Identifies if the function is prohibited from sending a message
* using this MSIX table entry
*/
struct pci_epf_msix_tbl {
u64 msg_addr;
u32 msg_data;
u32 vector_ctrl;
};
#define to_pci_epf(epf_dev) container_of((epf_dev), struct pci_epf, dev)
#define pci_epf_register_driver(driver) \
__pci_epf_register_driver((driver), THIS_MODULE)
static inline void epf_set_drvdata(struct pci_epf *epf, void *data)
{
dev_set_drvdata(&epf->dev, data);
}
static inline void *epf_get_drvdata(struct pci_epf *epf)
{
return dev_get_drvdata(&epf->dev);
}
struct pci_epf *pci_epf_create(const char *name);
void pci_epf_destroy(struct pci_epf *epf);
int __pci_epf_register_driver(struct pci_epf_driver *driver,
struct module *owner);
void pci_epf_unregister_driver(struct pci_epf_driver *driver);
void *pci_epf_alloc_space(struct pci_epf *epf, size_t size, enum pci_barno bar,
size_t align, enum pci_epc_interface_type type);
void pci_epf_free_space(struct pci_epf *epf, void *addr, enum pci_barno bar,
enum pci_epc_interface_type type);
int pci_epf_bind(struct pci_epf *epf);
void pci_epf_unbind(struct pci_epf *epf);
struct config_group *pci_epf_type_add_cfs(struct pci_epf *epf,
struct config_group *group);
#endif /* __LINUX_PCI_EPF_H */
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