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/* SPDX-License-Identifier: GPL-2.0
*
* Header file for the CDX Bus
*
* Copyright (C) 2022-2023, Advanced Micro Devices, Inc.
*/
#ifndef _CDX_H_
#define _CDX_H_
#include <linux/cdx/cdx_bus.h>
/**
* struct cdx_dev_params - CDX device parameters
* @cdx: CDX controller associated with the device
* @parent: Associated CDX Bus device
* @vendor: Vendor ID for CDX device
* @device: Device ID for CDX device
* @subsys_vendor: Sub vendor ID for CDX device
* @subsys_device: Sub device ID for CDX device
* @bus_num: Bus number for this CDX device
* @dev_num: Device number for this device
* @res: array of MMIO region entries
* @res_count: number of valid MMIO regions
* @req_id: Requestor ID associated with CDX device
* @class: Class of the CDX Device
* @revision: Revision of the CDX device
* @msi_dev_id: MSI device ID associated with CDX device
* @num_msi: Number of MSI's supported by the device
*/
struct cdx_dev_params {
struct cdx_controller *cdx;
struct device *parent;
u16 vendor;
u16 device;
u16 subsys_vendor;
u16 subsys_device;
u8 bus_num;
u8 dev_num;
struct resource res[MAX_CDX_DEV_RESOURCES];
u8 res_count;
u32 req_id;
u32 class;
u8 revision;
u32 msi_dev_id;
u32 num_msi;
};
/**
* cdx_register_controller - Register a CDX controller and its ports
* on the CDX bus.
* @cdx: The CDX controller to register
*
* Return: -errno on failure, 0 on success.
*/
int cdx_register_controller(struct cdx_controller *cdx);
/**
* cdx_unregister_controller - Unregister a CDX controller
* @cdx: The CDX controller to unregister
*/
void cdx_unregister_controller(struct cdx_controller *cdx);
/**
* cdx_device_add - Add a CDX device. This function adds a CDX device
* on the CDX bus as per the device parameters provided
* by caller. It also creates and registers an associated
* Linux generic device.
* @dev_params: device parameters associated with the device to be created.
*
* Return: -errno on failure, 0 on success.
*/
int cdx_device_add(struct cdx_dev_params *dev_params);
/**
* cdx_bus_add - Add a CDX bus. This function adds a bus on the CDX bus
* subsystem. It creates a CDX device for the corresponding bus and
* also registers an associated Linux generic device.
* @cdx: Associated CDX controller
* @us_num: Bus number
*
* Return: associated Linux generic device pointer on success or NULL on failure.
*/
struct device *cdx_bus_add(struct cdx_controller *cdx, u8 bus_num);
/**
* cdx_msi_domain_init - Init the CDX bus MSI domain.
* @dev: Device of the CDX bus controller
*
* Return: CDX MSI domain, NULL on failure
*/
struct irq_domain *cdx_msi_domain_init(struct device *dev);
#endif /* _CDX_H_ */
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