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Introduce AMD CDX bus, which provides a mechanism for scanning and probing CDX devices. These devices are memory mapped on system bus for Application Processors(APUs). CDX devices can be changed dynamically in the Fabric and CDX bus interacts with CDX controller to rescan the bus and rediscover the devices. Signed-off-by: Nipun Gupta <nipun.gupta@amd.com> Reviewed-by: Pieter Jansen van Vuuren <pieter.jansen-van-vuuren@amd.com> Tested-by: Nikhil Agarwal <nikhil.agarwal@amd.com> Link: https://lore.kernel.org/r/20230313132636.31850-2-nipun.gupta@amd.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
63 lines
1.6 KiB
C
63 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0
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*
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* Header file for the CDX Bus
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*
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* Copyright (C) 2022-2023, Advanced Micro Devices, Inc.
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*/
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#ifndef _CDX_H_
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#define _CDX_H_
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#include <linux/cdx/cdx_bus.h>
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/**
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* struct cdx_dev_params - CDX device parameters
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* @cdx: CDX controller associated with the device
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* @parent: Associated CDX controller
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* @vendor: Vendor ID for CDX device
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* @device: Device ID for CDX device
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* @bus_num: Bus number for this CDX device
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* @dev_num: Device number for this device
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* @res: array of MMIO region entries
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* @res_count: number of valid MMIO regions
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* @req_id: Requestor ID associated with CDX device
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*/
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struct cdx_dev_params {
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struct cdx_controller *cdx;
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u16 vendor;
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u16 device;
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u8 bus_num;
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u8 dev_num;
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struct resource res[MAX_CDX_DEV_RESOURCES];
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u8 res_count;
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u32 req_id;
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};
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/**
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* cdx_register_controller - Register a CDX controller and its ports
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* on the CDX bus.
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* @cdx: The CDX controller to register
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*
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* Return: -errno on failure, 0 on success.
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*/
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int cdx_register_controller(struct cdx_controller *cdx);
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/**
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* cdx_unregister_controller - Unregister a CDX controller
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* @cdx: The CDX controller to unregister
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*/
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void cdx_unregister_controller(struct cdx_controller *cdx);
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/**
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* cdx_device_add - Add a CDX device. This function adds a CDX device
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* on the CDX bus as per the device parameters provided
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* by caller. It also creates and registers an associated
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* Linux generic device.
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* @dev_params: device parameters associated with the device to be created.
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*
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* Return: -errno on failure, 0 on success.
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*/
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int cdx_device_add(struct cdx_dev_params *dev_params);
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#endif /* _CDX_H_ */
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