1# SPDX-License-Identifier: GPL-2.0-only 2menu "ARM System Control and Management Interface Protocol" 3 4config ARM_SCMI_PROTOCOL 5 tristate "ARM System Control and Management Interface (SCMI) Message Protocol" 6 depends on ARM || ARM64 || COMPILE_TEST 7 help 8 ARM System Control and Management Interface (SCMI) protocol is a 9 set of operating system-independent software interfaces that are 10 used in system management. SCMI is extensible and currently provides 11 interfaces for: Discovery and self-description of the interfaces 12 it supports, Power domain management which is the ability to place 13 a given device or domain into the various power-saving states that 14 it supports, Performance management which is the ability to control 15 the performance of a domain that is composed of compute engines 16 such as application processors and other accelerators, Clock 17 management which is the ability to set and inquire rates on platform 18 managed clocks and Sensor management which is the ability to read 19 sensor data, and be notified of sensor value. 20 21 This protocol library provides interface for all the client drivers 22 making use of the features offered by the SCMI. 23 24if ARM_SCMI_PROTOCOL 25 26config ARM_SCMI_NEED_DEBUGFS 27 bool 28 help 29 This declares whether at least one SCMI facility is configured 30 which needs debugfs support. When selected causess the creation 31 of a common SCMI debugfs root directory. 32 33config ARM_SCMI_RAW_MODE_SUPPORT 34 bool "Enable support for SCMI Raw transmission mode" 35 depends on DEBUG_FS 36 select ARM_SCMI_NEED_DEBUGFS 37 help 38 Enable support for SCMI Raw transmission mode. 39 40 If enabled allows the direct injection and snooping of SCMI bare 41 messages through a dedicated debugfs interface. 42 It is meant to be used by SCMI compliance/testing suites. 43 44 When enabled regular SCMI drivers interactions are inhibited in 45 order to avoid unexpected interactions with the SCMI Raw message 46 flow. If unsure say N. 47 48config ARM_SCMI_RAW_MODE_SUPPORT_COEX 49 bool "Allow SCMI Raw mode coexistence with normal SCMI stack" 50 depends on ARM_SCMI_RAW_MODE_SUPPORT 51 help 52 Allow SCMI Raw transmission mode to coexist with normal SCMI stack. 53 54 This will allow regular SCMI drivers to register with the core and 55 operate normally, thing which could make an SCMI test suite using the 56 SCMI Raw mode support unreliable. If unsure, say N. 57 58config ARM_SCMI_DEBUG_COUNTERS 59 bool "Enable SCMI communication debug metrics tracking" 60 select ARM_SCMI_NEED_DEBUGFS 61 depends on DEBUG_FS 62 default n 63 help 64 Enables tracking of some key communication metrics for debug 65 purposes. It may track metrics like how many messages were sent 66 or received, were there any failures, what kind of failures, ..etc. 67 68 Enable this option to create a new debugfs directory which contains 69 such useful debug counters. This can be helpful for debugging and 70 SCMI monitoring. 71 72config ARM_SCMI_HAVE_TRANSPORT 73 bool 74 help 75 This declares whether at least one SCMI transport has been configured. 76 Used to trigger a build bug when trying to build SCMI without any 77 configured transport. 78 79config ARM_SCMI_HAVE_SHMEM 80 bool 81 help 82 This declares whether a shared memory based transport for SCMI is 83 available. 84 85config ARM_SCMI_HAVE_MSG 86 bool 87 help 88 This declares whether a message passing based transport for SCMI is 89 available. 90 91config ARM_SCMI_TRANSPORT_MAILBOX 92 bool "SCMI transport based on Mailbox" 93 depends on MAILBOX 94 select ARM_SCMI_HAVE_TRANSPORT 95 select ARM_SCMI_HAVE_SHMEM 96 default y 97 help 98 Enable mailbox based transport for SCMI. 99 100 If you want the ARM SCMI PROTOCOL stack to include support for a 101 transport based on mailboxes, answer Y. 102 103config ARM_SCMI_TRANSPORT_OPTEE 104 bool "SCMI transport based on OP-TEE service" 105 depends on OPTEE=y || OPTEE=ARM_SCMI_PROTOCOL 106 select ARM_SCMI_HAVE_TRANSPORT 107 select ARM_SCMI_HAVE_SHMEM 108 select ARM_SCMI_HAVE_MSG 109 default y 110 help 111 This enables the OP-TEE service based transport for SCMI. 112 113 If you want the ARM SCMI PROTOCOL stack to include support for a 114 transport based on OP-TEE SCMI service, answer Y. 115 116config ARM_SCMI_TRANSPORT_SMC 117 bool "SCMI transport based on SMC" 118 depends on HAVE_ARM_SMCCC_DISCOVERY 119 select ARM_SCMI_HAVE_TRANSPORT 120 select ARM_SCMI_HAVE_SHMEM 121 default y 122 help 123 Enable SMC based transport for SCMI. 124 125 If you want the ARM SCMI PROTOCOL stack to include support for a 126 transport based on SMC, answer Y. 127 128config ARM_SCMI_TRANSPORT_SMC_ATOMIC_ENABLE 129 bool "Enable atomic mode support for SCMI SMC transport" 130 depends on ARM_SCMI_TRANSPORT_SMC 131 help 132 Enable support of atomic operation for SCMI SMC based transport. 133 134 If you want the SCMI SMC based transport to operate in atomic 135 mode, avoiding any kind of sleeping behaviour for selected 136 transactions on the TX path, answer Y. 137 Enabling atomic mode operations allows any SCMI driver using this 138 transport to optionally ask for atomic SCMI transactions and operate 139 in atomic context too, at the price of using a number of busy-waiting 140 primitives all over instead. If unsure say N. 141 142config ARM_SCMI_TRANSPORT_VIRTIO 143 bool "SCMI transport based on VirtIO" 144 depends on VIRTIO=y || VIRTIO=ARM_SCMI_PROTOCOL 145 select ARM_SCMI_HAVE_TRANSPORT 146 select ARM_SCMI_HAVE_MSG 147 help 148 This enables the virtio based transport for SCMI. 149 150 If you want the ARM SCMI PROTOCOL stack to include support for a 151 transport based on VirtIO, answer Y. 152 153config ARM_SCMI_TRANSPORT_VIRTIO_VERSION1_COMPLIANCE 154 bool "SCMI VirtIO transport Version 1 compliance" 155 depends on ARM_SCMI_TRANSPORT_VIRTIO 156 default y 157 help 158 This enforces strict compliance with VirtIO Version 1 specification. 159 160 If you want the ARM SCMI VirtIO transport layer to refuse to work 161 with Legacy VirtIO backends and instead support only VirtIO Version 1 162 devices (or above), answer Y. 163 164 If you want instead to support also old Legacy VirtIO backends (like 165 the ones implemented by kvmtool) and let the core Kernel VirtIO layer 166 take care of the needed conversions, say N. 167 168config ARM_SCMI_TRANSPORT_VIRTIO_ATOMIC_ENABLE 169 bool "Enable atomic mode for SCMI VirtIO transport" 170 depends on ARM_SCMI_TRANSPORT_VIRTIO 171 help 172 Enable support of atomic operation for SCMI VirtIO based transport. 173 174 If you want the SCMI VirtIO based transport to operate in atomic 175 mode, avoiding any kind of sleeping behaviour for selected 176 transactions on the TX path, answer Y. 177 178 Enabling atomic mode operations allows any SCMI driver using this 179 transport to optionally ask for atomic SCMI transactions and operate 180 in atomic context too, at the price of using a number of busy-waiting 181 primitives all over instead. If unsure say N. 182 183endif #ARM_SCMI_PROTOCOL 184 185config ARM_SCMI_POWER_DOMAIN 186 tristate "SCMI power domain driver" 187 depends on ARM_SCMI_PROTOCOL || (COMPILE_TEST && OF) 188 default y 189 select PM_GENERIC_DOMAINS if PM 190 help 191 This enables support for the SCMI power domains which can be 192 enabled or disabled via the SCP firmware 193 194 This driver can also be built as a module. If so, the module 195 will be called scmi_pm_domain. Note this may needed early in boot 196 before rootfs may be available. 197 198config ARM_SCMI_POWER_CONTROL 199 tristate "SCMI system power control driver" 200 depends on ARM_SCMI_PROTOCOL || (COMPILE_TEST && OF) 201 help 202 This enables System Power control logic which binds system shutdown or 203 reboot actions to SCMI System Power notifications generated by SCP 204 firmware. 205 206 This driver can also be built as a module. If so, the module will be 207 called scmi_power_control. Note this may needed early in boot to catch 208 early shutdown/reboot SCMI requests. 209 210endmenu 211