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_HAVE_TRANSPORT 59 bool 60 help 61 This declares whether at least one SCMI transport has been configured. 62 Used to trigger a build bug when trying to build SCMI without any 63 configured transport. 64 65config ARM_SCMI_HAVE_SHMEM 66 bool 67 help 68 This declares whether a shared memory based transport for SCMI is 69 available. 70 71config ARM_SCMI_HAVE_MSG 72 bool 73 help 74 This declares whether a message passing based transport for SCMI is 75 available. 76 77config ARM_SCMI_TRANSPORT_MAILBOX 78 bool "SCMI transport based on Mailbox" 79 depends on MAILBOX 80 select ARM_SCMI_HAVE_TRANSPORT 81 select ARM_SCMI_HAVE_SHMEM 82 default y 83 help 84 Enable mailbox based transport for SCMI. 85 86 If you want the ARM SCMI PROTOCOL stack to include support for a 87 transport based on mailboxes, answer Y. 88 89config ARM_SCMI_TRANSPORT_OPTEE 90 bool "SCMI transport based on OP-TEE service" 91 depends on OPTEE=y || OPTEE=ARM_SCMI_PROTOCOL 92 select ARM_SCMI_HAVE_TRANSPORT 93 select ARM_SCMI_HAVE_SHMEM 94 select ARM_SCMI_HAVE_MSG 95 default y 96 help 97 This enables the OP-TEE service based transport for SCMI. 98 99 If you want the ARM SCMI PROTOCOL stack to include support for a 100 transport based on OP-TEE SCMI service, answer Y. 101 102config ARM_SCMI_TRANSPORT_SMC 103 bool "SCMI transport based on SMC" 104 depends on HAVE_ARM_SMCCC_DISCOVERY 105 select ARM_SCMI_HAVE_TRANSPORT 106 select ARM_SCMI_HAVE_SHMEM 107 default y 108 help 109 Enable SMC based transport for SCMI. 110 111 If you want the ARM SCMI PROTOCOL stack to include support for a 112 transport based on SMC, answer Y. 113 114config ARM_SCMI_TRANSPORT_SMC_ATOMIC_ENABLE 115 bool "Enable atomic mode support for SCMI SMC transport" 116 depends on ARM_SCMI_TRANSPORT_SMC 117 help 118 Enable support of atomic operation for SCMI SMC based transport. 119 120 If you want the SCMI SMC based transport to operate in atomic 121 mode, avoiding any kind of sleeping behaviour for selected 122 transactions on the TX path, answer Y. 123 Enabling atomic mode operations allows any SCMI driver using this 124 transport to optionally ask for atomic SCMI transactions and operate 125 in atomic context too, at the price of using a number of busy-waiting 126 primitives all over instead. If unsure say N. 127 128config ARM_SCMI_TRANSPORT_VIRTIO 129 bool "SCMI transport based on VirtIO" 130 depends on VIRTIO=y || VIRTIO=ARM_SCMI_PROTOCOL 131 select ARM_SCMI_HAVE_TRANSPORT 132 select ARM_SCMI_HAVE_MSG 133 help 134 This enables the virtio based transport for SCMI. 135 136 If you want the ARM SCMI PROTOCOL stack to include support for a 137 transport based on VirtIO, answer Y. 138 139config ARM_SCMI_TRANSPORT_VIRTIO_VERSION1_COMPLIANCE 140 bool "SCMI VirtIO transport Version 1 compliance" 141 depends on ARM_SCMI_TRANSPORT_VIRTIO 142 default y 143 help 144 This enforces strict compliance with VirtIO Version 1 specification. 145 146 If you want the ARM SCMI VirtIO transport layer to refuse to work 147 with Legacy VirtIO backends and instead support only VirtIO Version 1 148 devices (or above), answer Y. 149 150 If you want instead to support also old Legacy VirtIO backends (like 151 the ones implemented by kvmtool) and let the core Kernel VirtIO layer 152 take care of the needed conversions, say N. 153 154config ARM_SCMI_TRANSPORT_VIRTIO_ATOMIC_ENABLE 155 bool "Enable atomic mode for SCMI VirtIO transport" 156 depends on ARM_SCMI_TRANSPORT_VIRTIO 157 help 158 Enable support of atomic operation for SCMI VirtIO based transport. 159 160 If you want the SCMI VirtIO based transport to operate in atomic 161 mode, avoiding any kind of sleeping behaviour for selected 162 transactions on the TX path, answer Y. 163 164 Enabling atomic mode operations allows any SCMI driver using this 165 transport to optionally ask for atomic SCMI transactions and operate 166 in atomic context too, at the price of using a number of busy-waiting 167 primitives all over instead. If unsure say N. 168 169endif #ARM_SCMI_PROTOCOL 170 171config ARM_SCMI_POWER_CONTROL 172 tristate "SCMI system power control driver" 173 depends on ARM_SCMI_PROTOCOL || (COMPILE_TEST && OF) 174 help 175 This enables System Power control logic which binds system shutdown or 176 reboot actions to SCMI System Power notifications generated by SCP 177 firmware. 178 179 This driver can also be built as a module. If so, the module will be 180 called scmi_power_control. Note this may needed early in boot to catch 181 early shutdown/reboot SCMI requests. 182 183endmenu 184