Commit eb96b740 authored by Nipun Gupta's avatar Nipun Gupta Committed by Greg Kroah-Hartman
Browse files

cdx: add MCDI protocol interface for firmware interaction 



The MCDI (Management CPU Driver Interface) is used as a
protocol to communicate with the RPU firmware. It has
pre-defined set of messages for different message exchanges
between APU and RPU.

Signed-off-by: default avatarPuneet Gupta <puneet.gupta@amd.com>
Signed-off-by: default avatarNipun Gupta <nipun.gupta@amd.com>
Signed-off-by: default avatarTarak Reddy <tarak.reddy@amd.com>
Reviewed-by: default avatarPieter Jansen van Vuuren <pieter.jansen-van-vuuren@amd.com>
Tested-by: default avatarNikhil Agarwal <nikhil.agarwal@amd.com>
Link: https://lore.kernel.org/r/20230313132636.31850-5-nipun.gupta@amd.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent c47a88e1

drivers/cdx/Kconfig

+2 −0
Original line number Diff line number Diff line
@@ -15,3 +15,5 @@ config CDX_BUS 
	  of CDX devices. CDX devices are memory mapped on system bus

	  for embedded CPUs. CDX bus uses CDX controller and firmware

	  to scan these CDX devices.



source "drivers/cdx/controller/Kconfig"

drivers/cdx/Makefile

+1 −1
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@@ -5,4 +5,4 @@ 
# Copyright (C) 2022-2023, Advanced Micro Devices, Inc.

#



obj-$(CONFIG_CDX_BUS) += cdx.o
 
obj-$(CONFIG_CDX_BUS) += cdx.o controller/

drivers/cdx/controller/Kconfig

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# SPDX-License-Identifier: GPL-2.0-only

#

# CDX controller configuration

#

# Copyright (C) 2022-2023, Advanced Micro Devices, Inc.

#



if CDX_BUS



config MCDI_LOGGING

	bool "MCDI Logging for the CDX controller"

	depends on CDX_CONTROLLER

	help

	  Enable MCDI Logging for

	  the CDX Controller for debug

	  purpose.



	  If unsure, say N.



endif

drivers/cdx/controller/Makefile

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# SPDX-License-Identifier: GPL-2.0-only

#

# Makefile for CDX controller drivers

#

# Copyright (C) 2022-2023, Advanced Micro Devices, Inc.

#



obj-$(CONFIG_CDX_CONTROLLER) += cdx-controller.o

cdx-controller-objs := mcdi.o

drivers/cdx/controller/bitfield.h

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/* SPDX-License-Identifier: GPL-2.0

 *

 * Copyright 2005-2006 Fen Systems Ltd.

 * Copyright 2006-2013 Solarflare Communications Inc.

 * Copyright (C) 2022-2023, Advanced Micro Devices, Inc.

 */



#ifndef CDX_BITFIELD_H

#define CDX_BITFIELD_H



#include <linux/bitfield.h>



/* Lowest bit numbers and widths */

#define CDX_DWORD_LBN 0

#define CDX_DWORD_WIDTH 32



/* Specified attribute (e.g. LBN) of the specified field */

#define CDX_VAL(field, attribute) field ## _ ## attribute

/* Low bit number of the specified field */

#define CDX_LOW_BIT(field) CDX_VAL(field, LBN)

/* Bit width of the specified field */

#define CDX_WIDTH(field) CDX_VAL(field, WIDTH)

/* High bit number of the specified field */

#define CDX_HIGH_BIT(field) (CDX_LOW_BIT(field) + CDX_WIDTH(field) - 1)



/* A doubleword (i.e. 4 byte) datatype - little-endian in HW */

struct cdx_dword {

	__le32 cdx_u32;

};



/* Value expanders for printk */

#define CDX_DWORD_VAL(dword)				\

	((unsigned int)le32_to_cpu((dword).cdx_u32))



/*

 * Extract bit field portion [low,high) from the 32-bit little-endian

 * element which contains bits [min,max)

 */

#define CDX_DWORD_FIELD(dword, field)					\

	(FIELD_GET(GENMASK(CDX_HIGH_BIT(field), CDX_LOW_BIT(field)),	\

		   le32_to_cpu((dword).cdx_u32)))



/*

 * Creates the portion of the named bit field that lies within the

 * range [min,max).

 */

#define CDX_INSERT_FIELD(field, value)				\

	(FIELD_PREP(GENMASK(CDX_HIGH_BIT(field),		\

			    CDX_LOW_BIT(field)), value))



/*

 * Creates the portion of the named bit fields that lie within the

 * range [min,max).

 */

#define CDX_INSERT_FIELDS(field1, value1,		\

			  field2, value2,		\

			  field3, value3,		\

			  field4, value4,		\

			  field5, value5,		\

			  field6, value6,		\

			  field7, value7)		\

	(CDX_INSERT_FIELD(field1, (value1)) |		\

	 CDX_INSERT_FIELD(field2, (value2)) |		\

	 CDX_INSERT_FIELD(field3, (value3)) |		\

	 CDX_INSERT_FIELD(field4, (value4)) |		\

	 CDX_INSERT_FIELD(field5, (value5)) |		\

	 CDX_INSERT_FIELD(field6, (value6)) |		\

	 CDX_INSERT_FIELD(field7, (value7)))



#define CDX_POPULATE_DWORD(dword, ...)					\

	(dword).cdx_u32 = cpu_to_le32(CDX_INSERT_FIELDS(__VA_ARGS__))



/* Populate a dword field with various numbers of arguments */

#define CDX_POPULATE_DWORD_7 CDX_POPULATE_DWORD

#define CDX_POPULATE_DWORD_6(dword, ...) \

	CDX_POPULATE_DWORD_7(dword, CDX_DWORD, 0, __VA_ARGS__)

#define CDX_POPULATE_DWORD_5(dword, ...) \

	CDX_POPULATE_DWORD_6(dword, CDX_DWORD, 0, __VA_ARGS__)

#define CDX_POPULATE_DWORD_4(dword, ...) \

	CDX_POPULATE_DWORD_5(dword, CDX_DWORD, 0, __VA_ARGS__)

#define CDX_POPULATE_DWORD_3(dword, ...) \

	CDX_POPULATE_DWORD_4(dword, CDX_DWORD, 0, __VA_ARGS__)

#define CDX_POPULATE_DWORD_2(dword, ...) \

	CDX_POPULATE_DWORD_3(dword, CDX_DWORD, 0, __VA_ARGS__)

#define CDX_POPULATE_DWORD_1(dword, ...) \

	CDX_POPULATE_DWORD_2(dword, CDX_DWORD, 0, __VA_ARGS__)

#define CDX_SET_DWORD(dword) \

	CDX_POPULATE_DWORD_1(dword, CDX_DWORD, 0xffffffff)



#endif /* CDX_BITFIELD_H */