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a941b784b1
Introduce cdx_set_master() and cdx_clear_master() APIs to support enable and disable of bus mastering. Drivers need to use these APIs to enable/disable DMAs from the CDX devices. Signed-off-by: Nipun Gupta <nipun.gupta@amd.com> Reviewed-by: Pieter Jansen van Vuuren <pieter.jansen-van-vuuren@amd.com> Link: https://lore.kernel.org/r/20230915045423.31630-1-nipun.gupta@amd.com Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
74 lines
2 KiB
C
74 lines
2 KiB
C
/* SPDX-License-Identifier: GPL-2.0
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*
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* Header file for MCDI FW interaction for 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_MCDI_FUNCTIONS_H
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#define CDX_MCDI_FUNCTIONS_H
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#include "mcdi.h"
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#include "../cdx.h"
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/**
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* cdx_mcdi_get_num_buses - Get the total number of buses on
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* the controller.
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* @cdx: pointer to MCDI interface.
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*
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* Return: total number of buses available on the controller,
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* <0 on failure
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*/
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int cdx_mcdi_get_num_buses(struct cdx_mcdi *cdx);
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/**
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* cdx_mcdi_get_num_devs - Get the total number of devices on
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* a particular bus of the controller.
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* @cdx: pointer to MCDI interface.
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* @bus_num: Bus number.
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*
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* Return: total number of devices available on the bus, <0 on failure
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*/
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int cdx_mcdi_get_num_devs(struct cdx_mcdi *cdx, int bus_num);
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/**
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* cdx_mcdi_get_dev_config - Get configuration for a particular
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* bus_num:dev_num
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* @cdx: pointer to MCDI interface.
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* @bus_num: Bus number.
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* @dev_num: Device number.
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* @dev_params: Pointer to cdx_dev_params, this is populated by this
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* device with the configuration corresponding to the provided
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* bus_num:dev_num.
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*
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* Return: 0 total number of devices available on the bus, <0 on failure
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*/
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int cdx_mcdi_get_dev_config(struct cdx_mcdi *cdx,
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u8 bus_num, u8 dev_num,
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struct cdx_dev_params *dev_params);
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/**
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* cdx_mcdi_reset_device - Reset cdx device represented by bus_num:dev_num
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* @cdx: pointer to MCDI interface.
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* @bus_num: Bus number.
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* @dev_num: Device number.
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*
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* Return: 0 on success, <0 on failure
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*/
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int cdx_mcdi_reset_device(struct cdx_mcdi *cdx,
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u8 bus_num, u8 dev_num);
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/**
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* cdx_mcdi_bus_master_enable - Set/Reset bus mastering for cdx device
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* represented by bus_num:dev_num
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* @cdx: pointer to MCDI interface.
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* @bus_num: Bus number.
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* @dev_num: Device number.
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* @enable: Enable bus mastering if set, disable otherwise.
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*
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* Return: 0 on success, <0 on failure
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*/
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int cdx_mcdi_bus_master_enable(struct cdx_mcdi *cdx, u8 bus_num,
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u8 dev_num, bool enable);
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#endif /* CDX_MCDI_FUNCTIONS_H */
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