diff options
Diffstat (limited to 'drivers/firmware/scmi/base.c')
| -rw-r--r-- | drivers/firmware/scmi/base.c | 664 |
1 files changed, 664 insertions, 0 deletions
diff --git a/drivers/firmware/scmi/base.c b/drivers/firmware/scmi/base.c new file mode 100644 index 0000000000..1d41a8a98f --- /dev/null +++ b/drivers/firmware/scmi/base.c @@ -0,0 +1,664 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * SCMI Base protocol as U-Boot device + * + * Copyright (C) 2023 Linaro Limited + * author: AKASHI Takahiro <takahiro.akashi@linaro.org> + */ + +#include <common.h> +#include <dm.h> +#include <scmi_agent.h> +#include <scmi_protocols.h> +#include <stdlib.h> +#include <string.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 on failure + */ +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 on failure + */ +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 on failure + */ +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 on failure + */ +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: Pointer to vendor name + * + * Obtain the vendor's name in @vendor. + * It is a caller's responsibility to free @vendor. + * + * Return: 0 on success, error code on failure + */ +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; + + if (!vendor) + return -EINVAL; + + ret = devm_scmi_process_msg(dev, &msg); + if (ret) + return ret; + if (out.status) + return scmi_to_linux_errno(out.status); + + *vendor = strdup(out.vendor_identifier); + if (!*vendor) + return -ENOMEM; + + return 0; +} + +/** + * scmi_base_discover_sub_vendor_int - get sub-vendor name + * @dev: SCMI device + * @sub_vendor: Pointer to sub-vendor name + * + * Obtain the sub-vendor's name in @sub_vendor. + * It is a caller's responsibility to free @sub_vendor. + * + * Return: 0 on success, error code on failure + */ +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; + + if (!sub_vendor) + return -EINVAL; + + ret = devm_scmi_process_msg(dev, &msg); + if (ret) + return ret; + if (out.status) + return scmi_to_linux_errno(out.status); + + *sub_vendor = strdup(out.vendor_identifier); + if (!*sub_vendor) + return -ENOMEM; + + 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 on failure + */ +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 on + * failure + */ +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: Pointer to 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. + * It is a caller's responsibility to free @name. + * + * Return: 0 on success, error code on failure + */ +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); + + if (ret_agent_id) + *ret_agent_id = out.agent_id; + if (name) { + *name = strdup(out.name); + if (!*name) + return -ENOMEM; + } + + 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 on failure + */ +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 on failure + */ +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 + * + * Reset all the resource settings against @agent_id. + * The meaning of @flags is defined in SCMI specification. + * + * Return: 0 on success, error code on failure + */ +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 on failure + */ +static int scmi_base_probe(struct udevice *dev) +{ + u32 version; + int ret; + + ret = devm_scmi_of_get_channel(dev); + if (ret) { + dev_err(dev, "get_channel failed\n"); + return ret; + } + ret = scmi_base_protocol_version_int(dev, &version); + if (ret) { + dev_err(dev, "getting protocol version failed\n"); + return ret; + } + if (version < SCMI_BASE_PROTOCOL_VERSION) + return -EINVAL; + + return ret; +} + +static 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", +}; |