SCMI base protocol is mandatory according to the SCMI specification.

With this patch, SCMI base protocol can be accessed via SCMI transport
layers. All the commands, except SCMI_BASE_NOTIFY_ERRORS, are supported.
This is because U-Boot doesn't support interrupts and the current transport
layers are not able to handle asynchronous messages properly.

Signed-off-by: AKASHI Takahiro <takahiro.aka...@linaro.org>
---
v2
* add helper functions, removing direct uses of ops
* add function descriptions for each of functions in ops
---
 drivers/firmware/scmi/Makefile |   1 +
 drivers/firmware/scmi/base.c   | 637 +++++++++++++++++++++++++++++++++
 include/dm/uclass-id.h         |   1 +
 include/scmi_protocols.h       | 345 ++++++++++++++++++
 4 files changed, 984 insertions(+)
 create mode 100644 drivers/firmware/scmi/base.c

diff --git a/drivers/firmware/scmi/Makefile b/drivers/firmware/scmi/Makefile
index b2ff483c75a1..1a23d4981709 100644
--- a/drivers/firmware/scmi/Makefile
+++ b/drivers/firmware/scmi/Makefile
@@ -1,4 +1,5 @@
 obj-y  += scmi_agent-uclass.o
+obj-y  += base.o
 obj-y  += smt.o
 obj-$(CONFIG_SCMI_AGENT_SMCCC)         += smccc_agent.o
 obj-$(CONFIG_SCMI_AGENT_MAILBOX)       += mailbox_agent.o
diff --git a/drivers/firmware/scmi/base.c b/drivers/firmware/scmi/base.c
new file mode 100644
index 000000000000..2b61fa650d15
--- /dev/null
+++ b/drivers/firmware/scmi/base.c
@@ -0,0 +1,637 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * SCMI Base protocol as U-Boot device
+ *
+ * Copyright (C) 2023 Linaro Limited
+ *             author: AKASHI Takahiro <takahiro.aka...@linaro.org>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <scmi_agent.h>
+#include <scmi_protocols.h>
+#include <stdlib.h>
+#include <asm/types.h>
+#include <dm/device_compat.h>
+#include <linux/kernel.h>
+
+/**
+ * scmi_generic_protocol_version - get protocol version
+ * @dev:       SCMI device
+ * @id:                SCMI protocol ID
+ * @version:   Pointer to SCMI protocol version
+ *
+ * Obtain the protocol version number in @version.
+ *
+ * Return: 0 on success, error code otherwise
+ */
+int scmi_generic_protocol_version(struct udevice *dev,
+                                 enum scmi_std_protocol id, u32 *version)
+{
+       struct scmi_protocol_version_out out;
+       struct scmi_msg msg = {
+               .protocol_id = id,
+               .message_id = SCMI_PROTOCOL_VERSION,
+               .out_msg = (u8 *)&out,
+               .out_msg_sz = sizeof(out),
+       };
+       int ret;
+
+       ret = devm_scmi_process_msg(dev, &msg);
+       if (ret)
+               return ret;
+       if (out.status)
+               return scmi_to_linux_errno(out.status);
+
+       *version = out.version;
+
+       return 0;
+}
+
+/**
+ * scmi_base_protocol_version_int - get Base protocol version
+ * @dev:       SCMI device
+ * @version:   Pointer to SCMI protocol version
+ *
+ * Obtain the protocol version number in @version for Base protocol.
+ *
+ * Return: 0 on success, error code otherwise
+ */
+static int scmi_base_protocol_version_int(struct udevice *dev, u32 *version)
+{
+       return scmi_generic_protocol_version(dev, SCMI_PROTOCOL_ID_BASE,
+                                            version);
+}
+
+/**
+ * scmi_protocol_attrs_int - get protocol attributes
+ * @dev:               SCMI device
+ * @num_agents:                Number of SCMI agents
+ * @num_protocols:     Number of SCMI protocols
+ *
+ * Obtain the protocol attributes, the number of agents and the number
+ * of protocols, in @num_agents and @num_protocols respectively, that
+ * the device provides.
+ *
+ * Return: 0 on success, error code otherwise
+ */
+static int scmi_protocol_attrs_int(struct udevice *dev, u32 *num_agents,
+                                  u32 *num_protocols)
+{
+       struct scmi_protocol_attrs_out out;
+       struct scmi_msg msg = {
+               .protocol_id = SCMI_PROTOCOL_ID_BASE,
+               .message_id = SCMI_PROTOCOL_ATTRIBUTES,
+               .out_msg = (u8 *)&out,
+               .out_msg_sz = sizeof(out),
+       };
+       int ret;
+
+       ret = devm_scmi_process_msg(dev, &msg);
+       if (ret)
+               return ret;
+       if (out.status)
+               return scmi_to_linux_errno(out.status);
+
+       *num_agents = SCMI_PROTOCOL_ATTRS_NUM_AGENTS(out.attributes);
+       *num_protocols = SCMI_PROTOCOL_ATTRS_NUM_PROTOCOLS(out.attributes);
+
+       return 0;
+}
+
+/**
+ * scmi_protocol_message_attrs_int - get message-specific attributes
+ * @dev:               SCMI device
+ * @message_id:                SCMI message ID
+ * @attributes:                Message-specific attributes
+ *
+ * Obtain the message-specific attributes in @attributes.
+ * This command succeeds if the message is implemented and available.
+ *
+ * Return: 0 on success, error code otherwise
+ */
+static int scmi_protocol_message_attrs_int(struct udevice *dev, u32 message_id,
+                                          u32 *attributes)
+{
+       struct scmi_protocol_msg_attrs_out out;
+       struct scmi_msg msg = {
+               .protocol_id = SCMI_PROTOCOL_ID_BASE,
+               .message_id = SCMI_PROTOCOL_MESSAGE_ATTRIBUTES,
+               .in_msg = (u8 *)&message_id,
+               .in_msg_sz = sizeof(message_id),
+               .out_msg = (u8 *)&out,
+               .out_msg_sz = sizeof(out),
+       };
+       int ret;
+
+       ret = devm_scmi_process_msg(dev, &msg);
+       if (ret)
+               return ret;
+       if (out.status)
+               return scmi_to_linux_errno(out.status);
+
+       *attributes = out.attributes;
+
+       return 0;
+}
+
+/**
+ * scmi_base_discover_vendor_int - get vendor name
+ * @dev:       SCMI device
+ * @vendor:    Vendor name
+ *
+ * Obtain the vendor's name in @vendor.
+ *
+ * Return: 0 on success, error code otherwise
+ */
+static int scmi_base_discover_vendor_int(struct udevice *dev, u8 *vendor)
+{
+       struct scmi_base_discover_vendor_out out;
+       struct scmi_msg msg = {
+               .protocol_id = SCMI_PROTOCOL_ID_BASE,
+               .message_id = SCMI_BASE_DISCOVER_VENDOR,
+               .out_msg = (u8 *)&out,
+               .out_msg_sz = sizeof(out),
+       };
+       int ret;
+
+       ret = devm_scmi_process_msg(dev, &msg);
+       if (ret)
+               return ret;
+       if (out.status)
+               return scmi_to_linux_errno(out.status);
+
+       strcpy(vendor, out.vendor_identifier);
+
+       return 0;
+}
+
+/**
+ * scmi_base_discover_sub_vendor_int - get sub-vendor name
+ * @dev:       SCMI device
+ * @sub_vendor:        Sub-vendor name
+ *
+ * Obtain the sub-vendor's name in @sub_vendor.
+ *
+ * Return: 0 on success, error code otherwise
+ */
+static int scmi_base_discover_sub_vendor_int(struct udevice *dev,
+                                            u8 *sub_vendor)
+{
+       struct scmi_base_discover_vendor_out out;
+       struct scmi_msg msg = {
+               .protocol_id = SCMI_PROTOCOL_ID_BASE,
+               .message_id = SCMI_BASE_DISCOVER_SUB_VENDOR,
+               .out_msg = (u8 *)&out,
+               .out_msg_sz = sizeof(out),
+       };
+       int ret;
+
+       ret = devm_scmi_process_msg(dev, &msg);
+       if (ret)
+               return ret;
+       if (out.status)
+               return scmi_to_linux_errno(out.status);
+
+       strcpy(sub_vendor, out.vendor_identifier);
+
+       return 0;
+}
+
+/**
+ * scmi_base_discover_impl_version_int - get implementation version
+ * @dev:               SCMI device
+ * @impl_version:      Pointer to implementation version
+ *
+ * Obtain the implementation version number in @impl_version.
+ *
+ * Return: 0 on success, error code otherwise
+ */
+static int scmi_base_discover_impl_version_int(struct udevice *dev,
+                                              u32 *impl_version)
+{
+       struct scmi_base_discover_impl_version_out out;
+       struct scmi_msg msg = {
+               .protocol_id = SCMI_PROTOCOL_ID_BASE,
+               .message_id = SCMI_BASE_DISCOVER_IMPL_VERSION,
+               .out_msg = (u8 *)&out,
+               .out_msg_sz = sizeof(out),
+       };
+       int ret;
+
+       ret = devm_scmi_process_msg(dev, &msg);
+       if (ret)
+               return ret;
+       if (out.status)
+               return scmi_to_linux_errno(out.status);
+
+       *impl_version = out.impl_version;
+
+       return 0;
+}
+
+/**
+ * scmi_base_discover_list_protocols_int - get list of protocols
+ * @dev:       SCMI device
+ * @protocols: Pointer to array of SCMI protocols
+ *
+ * Obtain the list of protocols provided in @protocols.
+ * The number of elements in @protocols always match to the number of
+ * protocols returned by smci_protocol_attrs() when this function succeeds.
+ * It is a caller's responsibility to free @protocols.
+ *
+ * Return: the number of protocols in @protocols on success, error code 
otherwise
+ */
+static int scmi_base_discover_list_protocols_int(struct udevice *dev,
+                                                u8 **protocols)
+{
+       struct scmi_base_discover_list_protocols_out out;
+       int cur;
+       struct scmi_msg msg = {
+               .protocol_id = SCMI_PROTOCOL_ID_BASE,
+               .message_id = SCMI_BASE_DISCOVER_LIST_PROTOCOLS,
+               .in_msg = (u8 *)&cur,
+               .in_msg_sz = sizeof(cur),
+               .out_msg = (u8 *)&out,
+               .out_msg_sz = sizeof(out),
+       };
+       u32 num_agents, num_protocols;
+       u8 *buf;
+       int i, ret;
+
+       ret = scmi_base_protocol_attrs(dev, &num_agents, &num_protocols);
+       if (ret)
+               return ret;
+
+       buf = calloc(sizeof(u8), num_protocols);
+       if (!buf)
+               return -ENOMEM;
+
+       cur = 0;
+       do {
+               ret = devm_scmi_process_msg(dev, &msg);
+               if (ret)
+                       goto err;
+               if (out.status) {
+                       ret = scmi_to_linux_errno(out.status);
+                       goto err;
+               }
+
+               for (i = 0; i < out.num_protocols; i++, cur++)
+                       buf[cur] = out.protocols[i / 4] >> ((i % 4) * 8);
+       } while (cur < num_protocols);
+
+       *protocols = buf;
+
+       return num_protocols;
+err:
+       free(buf);
+
+       return ret;
+}
+
+/**
+ * scmi_base_discover_agent_int - identify agent
+ * @dev:               SCMI device
+ * @agent_id:          SCMI agent ID
+ * @ret_agent_id:      Pointer to SCMI agent ID
+ * @name:              SCMI agent name
+ *
+ * Obtain the agent's name in @name. If @agent_id is equal to 0xffffffff,
+ * this function returns the caller's agent id in @ret_agent_id.
+ *
+ * Return: 0 on success, error code otherwise
+ */
+static int scmi_base_discover_agent_int(struct udevice *dev, u32 agent_id,
+                                       u32 *ret_agent_id, u8 *name)
+{
+       struct scmi_base_discover_agent_out out;
+       struct scmi_msg msg = {
+               .protocol_id = SCMI_PROTOCOL_ID_BASE,
+               .message_id = SCMI_BASE_DISCOVER_AGENT,
+               .in_msg = (u8 *)&agent_id,
+               .in_msg_sz = sizeof(agent_id),
+               .out_msg = (u8 *)&out,
+               .out_msg_sz = sizeof(out),
+       };
+       int ret;
+
+       ret = devm_scmi_process_msg(dev, &msg);
+       if (ret)
+               return ret;
+       if (out.status)
+               return scmi_to_linux_errno(out.status);
+
+       strcpy(name, out.name);
+       *ret_agent_id = out.agent_id;
+
+       return 0;
+}
+
+/**
+ * scmi_base_set_device_permissions_int - configure access permission to device
+ * @dev:       SCMI device
+ * @agent_id:  SCMI agent ID
+ * @device_id: ID of device to access
+ * @flags:     A set of flags
+ *
+ * Ask for allowing or denying access permission to the device, @device_id.
+ * The meaning of @flags is defined in SCMI specification.
+ *
+ * Return: 0 on success, error code otherwise
+ */
+static int scmi_base_set_device_permissions_int(struct udevice *dev, u32 
agent_id,
+                                               u32 device_id, u32 flags)
+{
+       struct scmi_base_set_device_permissions_in in = {
+               .agent_id = agent_id,
+               .device_id = device_id,
+               .flags = flags,
+       };
+       s32 status;
+       struct scmi_msg msg = {
+               .protocol_id = SCMI_PROTOCOL_ID_BASE,
+               .message_id = SCMI_BASE_SET_DEVICE_PERMISSIONS,
+               .in_msg = (u8 *)&in,
+               .in_msg_sz = sizeof(in),
+               .out_msg = (u8 *)&status,
+               .out_msg_sz = sizeof(status),
+       };
+       int ret;
+
+       ret = devm_scmi_process_msg(dev, &msg);
+       if (ret)
+               return ret;
+       if (status)
+               return scmi_to_linux_errno(status);
+
+       return 0;
+}
+
+/**
+ * scmi_base_set_protocol_permissions_int - configure access permission to
+                                          protocol on device
+ * @dev:       SCMI device
+ * @agent_id:  SCMI agent ID
+ * @device_id: ID of device to access
+ * @command_id:        SCMI command ID
+ * @flags:     A set of flags
+ *
+ * Ask for allowing or denying access permission to the protocol, @command_id,
+ * on the device, @device_id.
+ * The meaning of @flags is defined in SCMI specification.
+ *
+ * Return: 0 on success, error code otherwise
+ */
+static int scmi_base_set_protocol_permissions_int(struct udevice *dev,
+                                                 u32 agent_id, u32 device_id,
+                                                 u32 command_id, u32 flags)
+{
+       struct scmi_base_set_protocol_permissions_in in = {
+               .agent_id = agent_id,
+               .device_id = device_id,
+               .command_id = command_id,
+               .flags = flags,
+       };
+       s32 status;
+       struct scmi_msg msg = {
+               .protocol_id = SCMI_PROTOCOL_ID_BASE,
+               .message_id = SCMI_BASE_SET_PROTOCOL_PERMISSIONS,
+               .in_msg = (u8 *)&in,
+               .in_msg_sz = sizeof(in),
+               .out_msg = (u8 *)&status,
+               .out_msg_sz = sizeof(status),
+       };
+       int ret;
+
+       ret = devm_scmi_process_msg(dev, &msg);
+       if (ret)
+               return ret;
+       if (status)
+               return scmi_to_linux_errno(status);
+
+       return 0;
+}
+
+/**
+ * scmi_base_reset_agent_configuration_int - reset resource settings
+ * @dev:       SCMI device
+ * @agent_id:  SCMI agent ID
+ * @flags:     A set of flags
+ *
+ * Ask for allowing or denying access permission to the protocol, @command_id,
+ * on the device, @device_id.
+ * The meaning of @flags is defined in SCMI specification.
+ *
+ * Return: 0 on success, error code otherwise
+ */
+static int scmi_base_reset_agent_configuration_int(struct udevice *dev,
+                                                  u32 agent_id, u32 flags)
+{
+       struct scmi_base_reset_agent_configuration_in in = {
+               .agent_id = agent_id,
+               .flags = flags,
+       };
+       s32 status;
+       struct scmi_msg msg = {
+               .protocol_id = SCMI_PROTOCOL_ID_BASE,
+               .message_id = SCMI_BASE_RESET_AGENT_CONFIGURATION,
+               .in_msg = (u8 *)&in,
+               .in_msg_sz = sizeof(in),
+               .out_msg = (u8 *)&status,
+               .out_msg_sz = sizeof(status),
+       };
+       int ret;
+
+       ret = devm_scmi_process_msg(dev, &msg);
+       if (ret)
+               return ret;
+       if (status)
+               return scmi_to_linux_errno(status);
+
+       return 0;
+}
+
+/**
+ * scmi_base_probe - probe base protocol device
+ * @dev:       SCMI device
+ *
+ * Probe the device for SCMI base protocol and initialize the private data.
+ *
+ * Return: 0 on success, error code otherwise
+ */
+static int scmi_base_probe(struct udevice *dev)
+{
+       int ret;
+
+       ret = devm_scmi_of_get_channel(dev);
+       if (ret) {
+               dev_err(dev, "get_channel failed\n");
+               return ret;
+       }
+
+       return ret;
+}
+
+struct scmi_base_ops scmi_base_ops = {
+       /* Commands */
+       .protocol_version = scmi_base_protocol_version_int,
+       .protocol_attrs = scmi_protocol_attrs_int,
+       .protocol_message_attrs = scmi_protocol_message_attrs_int,
+       .base_discover_vendor = scmi_base_discover_vendor_int,
+       .base_discover_sub_vendor = scmi_base_discover_sub_vendor_int,
+       .base_discover_impl_version = scmi_base_discover_impl_version_int,
+       .base_discover_list_protocols = scmi_base_discover_list_protocols_int,
+       .base_discover_agent = scmi_base_discover_agent_int,
+       .base_notify_errors = NULL,
+       .base_set_device_permissions = scmi_base_set_device_permissions_int,
+       .base_set_protocol_permissions = scmi_base_set_protocol_permissions_int,
+       .base_reset_agent_configuration =
+                       scmi_base_reset_agent_configuration_int,
+};
+
+int scmi_base_protocol_version(struct udevice *dev, u32 *version)
+{
+       const struct scmi_base_ops *ops = device_get_ops(dev);
+
+       if (ops->protocol_version)
+               return (*ops->protocol_version)(dev, version);
+
+       return -EOPNOTSUPP;
+}
+
+int scmi_base_protocol_attrs(struct udevice *dev, u32 *num_agents,
+                            u32 *num_protocols)
+{
+       const struct scmi_base_ops *ops = device_get_ops(dev);
+
+       if (ops->protocol_attrs)
+               return (*ops->protocol_attrs)(dev, num_agents, num_protocols);
+
+       return -EOPNOTSUPP;
+}
+
+int scmi_base_protocol_message_attrs(struct udevice *dev, u32 message_id,
+                                    u32 *attributes)
+{
+       const struct scmi_base_ops *ops = device_get_ops(dev);
+
+       if (ops->protocol_message_attrs)
+               return (*ops->protocol_message_attrs)(dev, message_id,
+                                                     attributes);
+
+       return -EOPNOTSUPP;
+}
+
+int scmi_base_discover_vendor(struct udevice *dev, u8 *vendor)
+{
+       const struct scmi_base_ops *ops = device_get_ops(dev);
+
+       if (ops->base_discover_vendor)
+               return (*ops->base_discover_vendor)(dev, vendor);
+
+       return -EOPNOTSUPP;
+}
+
+int scmi_base_discover_sub_vendor(struct udevice *dev, u8 *sub_vendor)
+{
+       const struct scmi_base_ops *ops = device_get_ops(dev);
+
+       if (ops->base_discover_sub_vendor)
+               return (*ops->base_discover_sub_vendor)(dev, sub_vendor);
+
+       return -EOPNOTSUPP;
+}
+
+int scmi_base_discover_impl_version(struct udevice *dev, u32 *impl_version)
+{
+       const struct scmi_base_ops *ops = device_get_ops(dev);
+
+       if (ops->base_discover_impl_version)
+               return (*ops->base_discover_impl_version)(dev, impl_version);
+
+       return -EOPNOTSUPP;
+}
+
+int scmi_base_discover_list_protocols(struct udevice *dev, u8 **protocols)
+{
+       const struct scmi_base_ops *ops = device_get_ops(dev);
+
+       if (ops->base_discover_list_protocols)
+               return (*ops->base_discover_list_protocols)(dev, protocols);
+
+       return -EOPNOTSUPP;
+}
+
+int scmi_base_discover_agent(struct udevice *dev, u32 agent_id,
+                            u32 *ret_agent_id, u8 *name)
+{
+       const struct scmi_base_ops *ops = device_get_ops(dev);
+
+       if (ops->base_discover_agent)
+               return (*ops->base_discover_agent)(dev, agent_id, ret_agent_id,
+                                                  name);
+
+       return -EOPNOTSUPP;
+}
+
+int scmi_base_notify_errors(struct udevice *dev, u32 enable)
+{
+       const struct scmi_base_ops *ops = device_get_ops(dev);
+
+       if (ops->base_notify_errors)
+               return (*ops->base_notify_errors)(dev, enable);
+
+       return -EOPNOTSUPP;
+}
+
+int scmi_base_set_device_permissions(struct udevice *dev, u32 agent_id,
+                                    u32 device_id, u32 flags)
+{
+       const struct scmi_base_ops *ops = device_get_ops(dev);
+
+       if (ops->base_set_device_permissions)
+               return (*ops->base_set_device_permissions)(dev, agent_id,
+                                                          device_id, flags);
+
+       return -EOPNOTSUPP;
+}
+
+int scmi_base_set_protocol_permissions(struct udevice *dev,
+                                      u32 agent_id, u32 device_id,
+                                      u32 command_id, u32 flags)
+{
+       const struct scmi_base_ops *ops = device_get_ops(dev);
+
+       if (ops->base_set_protocol_permissions)
+               return (*ops->base_set_protocol_permissions)(dev, agent_id,
+                                                            device_id,
+                                                            command_id,
+                                                            flags);
+
+       return -EOPNOTSUPP;
+}
+
+int scmi_base_reset_agent_configuration(struct udevice *dev, u32 agent_id,
+                                       u32 flags)
+{
+       const struct scmi_base_ops *ops = device_get_ops(dev);
+
+       if (ops->base_reset_agent_configuration)
+               return (*ops->base_reset_agent_configuration)(dev, agent_id,
+                                                             flags);
+
+       return -EOPNOTSUPP;
+}
+
+U_BOOT_DRIVER(scmi_base_drv) = {
+       .id = UCLASS_SCMI_BASE,
+       .name = "scmi_base_drv",
+       .ops = &scmi_base_ops,
+       .probe = scmi_base_probe,
+};
+
+UCLASS_DRIVER(scmi_base) = {
+       .id             = UCLASS_SCMI_BASE,
+       .name           = "scmi_base",
+};
diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h
index 307ad6931ca7..f7a110852321 100644
--- a/include/dm/uclass-id.h
+++ b/include/dm/uclass-id.h
@@ -116,6 +116,7 @@ enum uclass_id {
        UCLASS_RNG,             /* Random Number Generator */
        UCLASS_RTC,             /* Real time clock device */
        UCLASS_SCMI_AGENT,      /* Interface with an SCMI server */
+       UCLASS_SCMI_BASE,       /* Interface for SCMI Base protocol */
        UCLASS_SCSI,            /* SCSI device */
        UCLASS_SERIAL,          /* Serial UART */
        UCLASS_SIMPLE_BUS,      /* Bus with child devices */
diff --git a/include/scmi_protocols.h b/include/scmi_protocols.h
index a220cb2a91ad..64fd740472b5 100644
--- a/include/scmi_protocols.h
+++ b/include/scmi_protocols.h
@@ -49,6 +49,351 @@ enum scmi_discovery_id {
        SCMI_PROTOCOL_MESSAGE_ATTRIBUTES = 0x2,
 };
 
+/*
+ * SCMI Base Protocol
+ */
+#define SCMI_BASE_PROTOCOL_VERSION 0x20000
+
+enum scmi_base_message_id {
+       SCMI_BASE_DISCOVER_VENDOR = 0x3,
+       SCMI_BASE_DISCOVER_SUB_VENDOR = 0x4,
+       SCMI_BASE_DISCOVER_IMPL_VERSION = 0x5,
+       SCMI_BASE_DISCOVER_LIST_PROTOCOLS = 0x6,
+       SCMI_BASE_DISCOVER_AGENT = 0x7,
+       SCMI_BASE_NOTIFY_ERRORS = 0x8,
+       SCMI_BASE_SET_DEVICE_PERMISSIONS = 0x9,
+       SCMI_BASE_SET_PROTOCOL_PERMISSIONS = 0xa,
+       SCMI_BASE_RESET_AGENT_CONFIGURATION = 0xb,
+};
+
+#define SCMI_BASE_NAME_LENGTH_MAX 16
+
+/**
+ * struct scmi_protocol_version_out - Response for SCMI_PROTOCOL_VERSION
+ *                                     command
+ * @status:    SCMI command status
+ * @version:   Protocol version
+ */
+struct scmi_protocol_version_out {
+       s32 status;
+       u32 version;
+};
+
+/**
+ * struct scmi_protocol_attrs_out - Response for SCMI_PROTOCOL_ATTRIBUTES
+ *                                     command
+ * @status:    SCMI command status
+ * @attributes:        Protocol attributes or implementation details
+ */
+struct scmi_protocol_attrs_out {
+       s32 status;
+       u32 attributes;
+};
+
+#define SCMI_PROTOCOL_ATTRS_NUM_AGENTS(attributes) \
+                               (((attributes) & GENMASK(15, 8)) >> 8)
+#define SCMI_PROTOCOL_ATTRS_NUM_PROTOCOLS(attributes) \
+                               ((attributes) & GENMASK(7, 0))
+
+/**
+ * struct scmi_protocol_msg_attrs_out - Response for
+ *                                     SCMI_PROTOCOL_MESSAGE_ATTRIBUTES command
+ * @status:    SCMI command status
+ * @attributes:        Message-specific attributes
+ */
+struct scmi_protocol_msg_attrs_out {
+       s32 status;
+       u32 attributes;
+};
+
+/**
+ * struct scmi_base_discover_vendor_out - Response for
+ *                                       SCMI_BASE_DISCOVER_VENDOR or
+ *                                       SCMI_BASE_DISCOVER_SUB_VENDOR command
+ * @status:            SCMI command status
+ * @vendor_identifier: Name of vendor or sub-vendor in string
+ */
+struct scmi_base_discover_vendor_out {
+       s32 status;
+       u8 vendor_identifier[SCMI_BASE_NAME_LENGTH_MAX];
+};
+
+/**
+ * struct scmi_base_discover_impl_version_out - Response for
+ *                                     SCMI_BASE_DISCOVER_IMPL_VERSION command
+ * @status:            SCMI command status
+ * @impl_version:      Vendor-specific implementation version
+ */
+struct scmi_base_discover_impl_version_out {
+       s32 status;
+       u32 impl_version;
+};
+
+/**
+ * struct scmi_base_discover_list_protocols_out - Response for
+ *                             SCMI_BASE_DISCOVER_LIST_PROTOCOLS command
+ * @status:            SCMI command status
+ * @num_protocols:     Number of SCMI protocols in @protocol
+ * @protocols:         Array of packed SCMI protocol ID's
+ */
+struct scmi_base_discover_list_protocols_out {
+       s32 status;
+       u32 num_protocols;
+       u32 protocols[3];
+};
+
+/**
+ * struct scmi_base_discover_agent_out - Response for
+ *                                      SCMI_BASE_DISCOVER_AGENT command
+ * @status:    SCMI command status
+ * @agent_id:  SCMI agent ID
+ * @name:      Name of agent in string
+ */
+struct scmi_base_discover_agent_out {
+       s32 status;
+       u32 agent_id;
+       u8 name[SCMI_BASE_NAME_LENGTH_MAX];
+};
+
+#define SCMI_BASE_NOTIFY_ERRORS_ENABLE BIT(0)
+
+/**
+ * struct scmi_base_set_device_permissions_in - Parameters for
+ *                                     SCMI_BASE_SET_DEVICE_PERMISSIONS command
+ * @agent_id:  SCMI agent ID
+ * @device_id: device ID
+ * @flags:     A set of flags
+ */
+struct scmi_base_set_device_permissions_in {
+       u32 agent_id;
+       u32 device_id;
+       u32 flags;
+};
+
+#define SCMI_BASE_SET_DEVICE_PERMISSIONS_ACCESS BIT(0)
+
+/**
+ * struct scmi_base_set_protocol_permissions_in - Parameters for
+ *                             SCMI_BASE_SET_PROTOCOL_PERMISSIONS command
+ * @agent_id:          SCMI agent ID
+ * @device_id:         device ID
+ * @command_id:                command ID
+ * @flags:             A set of flags
+ */
+struct scmi_base_set_protocol_permissions_in {
+       u32 agent_id;
+       u32 device_id;
+       u32 command_id;
+       u32 flags;
+};
+
+#define SCMI_BASE_SET_PROTOCOL_PERMISSIONS_COMMAND GENMASK(7, 0)
+#define SCMI_BASE_SET_PROTOCOL_PERMISSIONS_ACCESS BIT(0)
+
+/**
+ * struct scmi_base_reset_agent_configuration_in - Parameters for
+ *                             SCMI_BASE_RESET_AGENT_CONFIGURATION command
+ * @agent_id:  SCMI agent ID
+ * @flags:     A set of flags
+ */
+struct scmi_base_reset_agent_configuration_in {
+       u32 agent_id;
+       u32 flags;
+};
+
+#define SCMI_BASE_RESET_ALL_ACCESS_PERMISSIONS BIT(0)
+
+/**
+ * struct scmi_base_ops - SCMI base protocol interfaces
+ */
+struct scmi_base_ops {
+       /**
+        * protocol_version - get Base protocol version
+        * @dev:        SCMI device
+        * @version:    Pointer to SCMI protocol version
+        *
+        * Obtain the protocol version number in @version for Base protocol.
+        *
+        * Return: 0 on success, error code otherwise
+        */
+       int (*protocol_version)(struct udevice *dev, u32 *version);
+       /**
+        * protocol_attrs - get protocol attributes
+        * @dev:                SCMI device
+        * @num_agents:         Number of SCMI agents
+        * @num_protocols:      Number of SCMI protocols
+        *
+        * Obtain the protocol attributes, the number of agents and the number
+        * of protocols, in @num_agents and @num_protocols respectively, that
+        * the device provides.
+        *
+        * Return: 0 on success, error code otherwise
+        */
+       int (*protocol_attrs)(struct udevice *dev, u32 *num_agents,
+                             u32 *num_protocols);
+       /**
+        * protocol_message_attrs - get message-specific attributes
+        * @dev:                SCMI device
+        * @message_id:         SCMI message ID
+        * @attributes:         Message-specific attributes
+        *
+        * Obtain the message-specific attributes in @attributes.
+        * This command succeeds if the message is implemented and available.
+        *
+        * Return: 0 on success, error code otherwise
+        */
+       int (*protocol_message_attrs)(struct udevice *dev, u32 message_id,
+                                     u32 *attributes);
+       /**
+        * base_discover_vendor - get vendor name
+        * @dev:        SCMI device
+        * @vendor:     Vendor name
+        *
+        * Obtain the vendor's name in @vendor.
+        *
+        * Return: 0 on success, error code otherwise
+        */
+       int (*base_discover_vendor)(struct udevice *dev, u8 *vendor);
+       /**
+        * base_discover_sub_vendor - get sub-vendor name
+        * @dev:        SCMI device
+        * @sub_vendor: Sub-vendor name
+        *
+        * Obtain the sub-vendor's name in @sub_vendor.
+        *
+        * Return: 0 on success, error code otherwise
+        */
+       int (*base_discover_sub_vendor)(struct udevice *dev, u8 *sub_vendor);
+       /**
+        * base_discover_impl_version - get implementation version
+        * @dev:                SCMI device
+        * @impl_version:       Pointer to implementation version
+        *
+        * Obtain the implementation version number in @impl_version.
+        *
+        * Return: 0 on success, error code otherwise
+        */
+       int (*base_discover_impl_version)(struct udevice *dev, u32 
*impl_version);
+       /**
+        * base_discover_list_protocols - get list of protocols
+        * @dev:        SCMI device
+        * @protocols:  Pointer to array of SCMI protocols
+        *
+        * Obtain the list of protocols provided in @protocols.
+        * The number of elements in @protocols always match to the number of
+        * protocols returned by smci_protocol_attrs() when this function 
succeeds.
+        * It is a caller's responsibility to free @protocols.
+        *
+        * Return: the number of protocols in @protocols on success, error code 
otherwise
+        */
+       int (*base_discover_list_protocols)(struct udevice *dev, u8 
**protocols);
+       /**
+        * base_discover_agent - identify agent
+        * @dev:                SCMI device
+        * @agent_id:           SCMI agent ID
+        * @ret_agent_id:       Pointer to SCMI agent ID
+        * @name:               SCMI agent name
+        *
+        * Obtain the agent's name in @name. If @agent_id is equal to 
0xffffffff,
+        * this function returns the caller's agent id in @ret_agent_id.
+        *
+        * Return: 0 on success, error code otherwise
+        */
+       int (*base_discover_agent)(struct udevice *dev, u32 agent_id,
+                                  u32 *ret_agent_id, u8 *name);
+       /**
+        * base_notify_errors - configure error notification
+        * @dev:        SCMI device
+        * @enable:     Operation
+        *
+        * This function is not yet implemented.
+        *
+        * Return: always -EOPNOTSUPP
+        */
+       int (*base_notify_errors)(struct udevice *dev, u32 enable);
+       /**
+        * base_set_device_permissions - configure access permission to device
+        * @dev:        SCMI device
+        * @agent_id:   SCMI agent ID
+        * @device_id:  ID of device to access
+        * @flags:      A set of flags
+        *
+        * Ask for allowing or denying access permission to the device, 
@device_id.
+        * The meaning of @flags is defined in SCMI specification.
+        *
+        * Return: 0 on success, error code otherwise
+        */
+       int (*base_set_device_permissions)(struct udevice *dev, u32 agent_id,
+                                          u32 device_id, u32 flags);
+       /**
+        * base_set_protocol_permissions - configure access permission to
+        *                                 protocol on device
+        * @dev:        SCMI device
+        * @agent_id:   SCMI agent ID
+        * @device_id:  ID of device to access
+        * @command_id: command ID
+        * @flags:      A set of flags
+        *
+        * Ask for allowing or denying access permission to the protocol, 
@command_id,
+        * on the device, @device_id.
+        * The meaning of @flags is defined in SCMI specification.
+        *
+        * Return: 0 on success, error code otherwise
+        */
+       int (*base_set_protocol_permissions)(struct udevice *dev, u32 agent_id,
+                                            u32 device_id, u32 command_id,
+                                            u32 flags);
+       /**
+        * base_reset_agent_configuration - reset resource settings
+        * @dev:        SCMI device
+        * @agent_id:   SCMI agent ID
+        * @flags:      A set of flags
+        *
+        * Ask for allowing or denying access permission to the protocol, 
@command_id,
+        * on the device, @device_id.
+        * The meaning of @flags is defined in SCMI specification.
+        *
+        * Return: 0 on success, error code otherwise
+        */
+       int (*base_reset_agent_configuration)(struct udevice *dev, u32 agent_id,
+                                             u32 flags);
+};
+
+int scmi_base_protocol_version(struct udevice *dev, u32 *version);
+int scmi_base_protocol_attrs(struct udevice *dev, u32 *num_agents,
+                            u32 *num_protocols);
+int scmi_base_protocol_message_attrs(struct udevice *dev, u32 message_id,
+                                    u32 *attributes);
+int scmi_base_discover_vendor(struct udevice *dev, u8 *vendor);
+int scmi_base_discover_sub_vendor(struct udevice *dev, u8 *sub_vendor);
+int scmi_base_discover_impl_version(struct udevice *dev, u32 *impl_version);
+int scmi_base_discover_list_protocols(struct udevice *dev, u8 **protocols);
+int scmi_base_discover_agent(struct udevice *dev, u32 agent_id,
+                            u32 *ret_agent_id, u8 *name);
+int scmi_base_notify_errors(struct udevice *dev, u32 enable);
+int scmi_base_set_device_permissions(struct udevice *dev, u32 agent_id,
+                                    u32 device_id, u32 flags);
+int scmi_base_set_device_permissions(struct udevice *dev, u32 agent_id,
+                                    u32 device_id, u32 flags);
+int scmi_base_set_protocol_permissions(struct udevice *dev,
+                                      u32 agent_id, u32 device_id,
+                                      u32 command_id, u32 flags);
+int scmi_base_reset_agent_configuration(struct udevice *dev, u32 agent_id,
+                                       u32 flags);
+
+/**
+ * scmi_generic_protocol_version - get protocol version
+ * @dev:       SCMI device
+ * @id:                SCMI protocol ID
+ * @version:   Pointer to SCMI protocol version
+ *
+ * Obtain the protocol version number in @version.
+ *
+ * Return: 0 on success, error code otherwise
+ */
+int scmi_generic_protocol_version(struct udevice *dev,
+                                 enum scmi_std_protocol id, u32 *version);
+
 /*
  * SCMI Clock Protocol
  */
-- 
2.41.0

Reply via email to