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1/* SPDX-License-Identifier: GPL-2.0
2 *
3 * Header file for MCDI FW interaction for CDX bus.
4 *
5 * Copyright (C) 2022-2023, Advanced Micro Devices, Inc.
6 */
7
8#ifndef CDX_MCDI_FUNCTIONS_H
9#define CDX_MCDI_FUNCTIONS_H
10
11#include <linux/cdx/mcdi.h>
12#include "mcdid.h"
13#include "../cdx.h"
14
15/**
16 * cdx_mcdi_get_num_buses - Get the total number of buses on
17 * the controller.
18 * @cdx: pointer to MCDI interface.
19 *
20 * Return: total number of buses available on the controller,
21 * <0 on failure
22 */
23int cdx_mcdi_get_num_buses(struct cdx_mcdi *cdx);
24
25/**
26 * cdx_mcdi_get_num_devs - Get the total number of devices on
27 * a particular bus of the controller.
28 * @cdx: pointer to MCDI interface.
29 * @bus_num: Bus number.
30 *
31 * Return: total number of devices available on the bus, <0 on failure
32 */
33int cdx_mcdi_get_num_devs(struct cdx_mcdi *cdx, int bus_num);
34
35/**
36 * cdx_mcdi_get_dev_config - Get configuration for a particular
37 * bus_num:dev_num
38 * @cdx: pointer to MCDI interface.
39 * @bus_num: Bus number.
40 * @dev_num: Device number.
41 * @dev_params: Pointer to cdx_dev_params, this is populated by this
42 * device with the configuration corresponding to the provided
43 * bus_num:dev_num.
44 *
45 * Return: 0 total number of devices available on the bus, <0 on failure
46 */
47int cdx_mcdi_get_dev_config(struct cdx_mcdi *cdx,
48 u8 bus_num, u8 dev_num,
49 struct cdx_dev_params *dev_params);
50
51/**
52 * cdx_mcdi_bus_enable - Enable CDX bus represented by bus_num
53 * @cdx: pointer to MCDI interface.
54 * @bus_num: Bus number.
55 *
56 * Return: 0 on success, <0 on failure
57 */
58int cdx_mcdi_bus_enable(struct cdx_mcdi *cdx, u8 bus_num);
59
60/**
61 * cdx_mcdi_bus_disable - Disable CDX bus represented by bus_num
62 * @cdx: pointer to MCDI interface.
63 * @bus_num: Bus number.
64 *
65 * Return: 0 on success, <0 on failure
66 */
67int cdx_mcdi_bus_disable(struct cdx_mcdi *cdx, u8 bus_num);
68
69/**
70 * cdx_mcdi_write_msi - Write MSI configuration for CDX device
71 * @cdx: pointer to MCDI interface.
72 * @bus_num: Bus number.
73 * @dev_num: Device number.
74 * @msi_vector: Device-relative MSI vector number.
75 * Must be < MSI_COUNT reported for the device.
76 * @msi_address: MSI address to be used by the hardware. Typically, on ARM
77 * systems this address is translated by the IOMMU (if enabled) and
78 * it is the responsibility of the entity managing the IOMMU (APU kernel)
79 * to supply the correct IOVA here.
80 * @msi_data: MSI data to be used by the hardware. On versal-net, only the
81 * lower 16-bits are used, the remaining bits are ignored and should be
82 * set to zero.
83 *
84 * Return: 0 on success, <0 on failure
85 */
86int cdx_mcdi_write_msi(struct cdx_mcdi *cdx, u8 bus_num, u8 dev_num,
87 u32 msi_vector, u64 msi_address, u32 msi_data);
88
89/**
90 * cdx_mcdi_reset_device - Reset cdx device represented by bus_num:dev_num
91 * @cdx: pointer to MCDI interface.
92 * @bus_num: Bus number.
93 * @dev_num: Device number.
94 *
95 * Return: 0 on success, <0 on failure
96 */
97int cdx_mcdi_reset_device(struct cdx_mcdi *cdx,
98 u8 bus_num, u8 dev_num);
99
100/**
101 * cdx_mcdi_bus_master_enable - Set/Reset bus mastering for cdx device
102 * represented by bus_num:dev_num
103 * @cdx: pointer to MCDI interface.
104 * @bus_num: Bus number.
105 * @dev_num: Device number.
106 * @enable: Enable bus mastering if set, disable otherwise.
107 *
108 * Return: 0 on success, <0 on failure
109 */
110int cdx_mcdi_bus_master_enable(struct cdx_mcdi *cdx, u8 bus_num,
111 u8 dev_num, bool enable);
112
113/**
114 * cdx_mcdi_msi_enable - Enable/Disable MSIs for cdx device represented
115 * by bus_num:dev_num
116 * @cdx: pointer to MCDI interface.
117 * @bus_num: Bus number.
118 * @dev_num: Device number.
119 * @enable: Enable msi's if set, disable otherwise.
120 *
121 * Return: 0 on success, <0 on failure
122 */
123int cdx_mcdi_msi_enable(struct cdx_mcdi *cdx, u8 bus_num,
124 u8 dev_num, bool enable);
125
126#endif /* CDX_MCDI_FUNCTIONS_H */