![Sudeep Holla](/assets/img/avatar_default.png)
Instead of type-casting the {tx,rx}.buf all over the place while accessing them to read/write __le{32,64} from/to the firmware, let's use the existing {get,put}_unaligned_le{32,64} accessors to hide all the type cast ugliness. Suggested-by: Philipp Zabel <p.zabel@pengutronix.de> Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
259 lines
6.1 KiB
C
259 lines
6.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* System Control and Management Interface (SCMI) Base Protocol
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*
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* Copyright (C) 2018 ARM Ltd.
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*/
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#include "common.h"
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enum scmi_base_protocol_cmd {
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BASE_DISCOVER_VENDOR = 0x3,
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BASE_DISCOVER_SUB_VENDOR = 0x4,
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BASE_DISCOVER_IMPLEMENT_VERSION = 0x5,
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BASE_DISCOVER_LIST_PROTOCOLS = 0x6,
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BASE_DISCOVER_AGENT = 0x7,
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BASE_NOTIFY_ERRORS = 0x8,
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};
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struct scmi_msg_resp_base_attributes {
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u8 num_protocols;
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u8 num_agents;
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__le16 reserved;
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};
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/**
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* scmi_base_attributes_get() - gets the implementation details
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* that are associated with the base protocol.
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*
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* @handle: SCMI entity handle
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*
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* Return: 0 on success, else appropriate SCMI error.
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*/
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static int scmi_base_attributes_get(const struct scmi_handle *handle)
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{
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int ret;
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struct scmi_xfer *t;
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struct scmi_msg_resp_base_attributes *attr_info;
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struct scmi_revision_info *rev = handle->version;
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ret = scmi_xfer_get_init(handle, PROTOCOL_ATTRIBUTES,
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SCMI_PROTOCOL_BASE, 0, sizeof(*attr_info), &t);
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if (ret)
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return ret;
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ret = scmi_do_xfer(handle, t);
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if (!ret) {
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attr_info = t->rx.buf;
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rev->num_protocols = attr_info->num_protocols;
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rev->num_agents = attr_info->num_agents;
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}
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scmi_xfer_put(handle, t);
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return ret;
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}
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/**
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* scmi_base_vendor_id_get() - gets vendor/subvendor identifier ASCII string.
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*
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* @handle: SCMI entity handle
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* @sub_vendor: specify true if sub-vendor ID is needed
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*
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* Return: 0 on success, else appropriate SCMI error.
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*/
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static int
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scmi_base_vendor_id_get(const struct scmi_handle *handle, bool sub_vendor)
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{
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u8 cmd;
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int ret, size;
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char *vendor_id;
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struct scmi_xfer *t;
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struct scmi_revision_info *rev = handle->version;
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if (sub_vendor) {
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cmd = BASE_DISCOVER_SUB_VENDOR;
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vendor_id = rev->sub_vendor_id;
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size = ARRAY_SIZE(rev->sub_vendor_id);
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} else {
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cmd = BASE_DISCOVER_VENDOR;
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vendor_id = rev->vendor_id;
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size = ARRAY_SIZE(rev->vendor_id);
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}
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ret = scmi_xfer_get_init(handle, cmd, SCMI_PROTOCOL_BASE, 0, size, &t);
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if (ret)
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return ret;
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ret = scmi_do_xfer(handle, t);
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if (!ret)
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memcpy(vendor_id, t->rx.buf, size);
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scmi_xfer_put(handle, t);
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return ret;
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}
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/**
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* scmi_base_implementation_version_get() - gets a vendor-specific
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* implementation 32-bit version. The format of the version number is
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* vendor-specific
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*
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* @handle: SCMI entity handle
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*
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* Return: 0 on success, else appropriate SCMI error.
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*/
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static int
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scmi_base_implementation_version_get(const struct scmi_handle *handle)
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{
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int ret;
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__le32 *impl_ver;
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struct scmi_xfer *t;
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struct scmi_revision_info *rev = handle->version;
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ret = scmi_xfer_get_init(handle, BASE_DISCOVER_IMPLEMENT_VERSION,
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SCMI_PROTOCOL_BASE, 0, sizeof(*impl_ver), &t);
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if (ret)
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return ret;
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ret = scmi_do_xfer(handle, t);
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if (!ret) {
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impl_ver = t->rx.buf;
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rev->impl_ver = le32_to_cpu(*impl_ver);
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}
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scmi_xfer_put(handle, t);
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return ret;
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}
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/**
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* scmi_base_implementation_list_get() - gets the list of protocols it is
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* OSPM is allowed to access
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*
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* @handle: SCMI entity handle
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* @protocols_imp: pointer to hold the list of protocol identifiers
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*
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* Return: 0 on success, else appropriate SCMI error.
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*/
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static int scmi_base_implementation_list_get(const struct scmi_handle *handle,
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u8 *protocols_imp)
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{
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u8 *list;
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int ret, loop;
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struct scmi_xfer *t;
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__le32 *num_skip, *num_ret;
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u32 tot_num_ret = 0, loop_num_ret;
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struct device *dev = handle->dev;
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ret = scmi_xfer_get_init(handle, BASE_DISCOVER_LIST_PROTOCOLS,
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SCMI_PROTOCOL_BASE, sizeof(*num_skip), 0, &t);
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if (ret)
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return ret;
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num_skip = t->tx.buf;
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num_ret = t->rx.buf;
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list = t->rx.buf + sizeof(*num_ret);
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do {
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/* Set the number of protocols to be skipped/already read */
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*num_skip = cpu_to_le32(tot_num_ret);
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ret = scmi_do_xfer(handle, t);
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if (ret)
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break;
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loop_num_ret = le32_to_cpu(*num_ret);
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if (tot_num_ret + loop_num_ret > MAX_PROTOCOLS_IMP) {
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dev_err(dev, "No. of Protocol > MAX_PROTOCOLS_IMP");
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break;
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}
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for (loop = 0; loop < loop_num_ret; loop++)
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protocols_imp[tot_num_ret + loop] = *(list + loop);
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tot_num_ret += loop_num_ret;
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} while (loop_num_ret);
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scmi_xfer_put(handle, t);
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return ret;
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}
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/**
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* scmi_base_discover_agent_get() - discover the name of an agent
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*
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* @handle: SCMI entity handle
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* @id: Agent identifier
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* @name: Agent identifier ASCII string
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*
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* An agent id of 0 is reserved to identify the platform itself.
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* Generally operating system is represented as "OSPM"
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*
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* Return: 0 on success, else appropriate SCMI error.
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*/
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static int scmi_base_discover_agent_get(const struct scmi_handle *handle,
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int id, char *name)
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{
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int ret;
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struct scmi_xfer *t;
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ret = scmi_xfer_get_init(handle, BASE_DISCOVER_AGENT,
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SCMI_PROTOCOL_BASE, sizeof(__le32),
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SCMI_MAX_STR_SIZE, &t);
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if (ret)
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return ret;
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put_unaligned_le32(id, t->tx.buf);
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ret = scmi_do_xfer(handle, t);
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if (!ret)
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strlcpy(name, t->rx.buf, SCMI_MAX_STR_SIZE);
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scmi_xfer_put(handle, t);
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return ret;
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}
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int scmi_base_protocol_init(struct scmi_handle *h)
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{
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int id, ret;
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u8 *prot_imp;
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u32 version;
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char name[SCMI_MAX_STR_SIZE];
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const struct scmi_handle *handle = h;
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struct device *dev = handle->dev;
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struct scmi_revision_info *rev = handle->version;
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ret = scmi_version_get(handle, SCMI_PROTOCOL_BASE, &version);
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if (ret)
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return ret;
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prot_imp = devm_kcalloc(dev, MAX_PROTOCOLS_IMP, sizeof(u8), GFP_KERNEL);
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if (!prot_imp)
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return -ENOMEM;
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rev->major_ver = PROTOCOL_REV_MAJOR(version),
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rev->minor_ver = PROTOCOL_REV_MINOR(version);
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scmi_base_attributes_get(handle);
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scmi_base_vendor_id_get(handle, false);
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scmi_base_vendor_id_get(handle, true);
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scmi_base_implementation_version_get(handle);
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scmi_base_implementation_list_get(handle, prot_imp);
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scmi_setup_protocol_implemented(handle, prot_imp);
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dev_info(dev, "SCMI Protocol v%d.%d '%s:%s' Firmware version 0x%x\n",
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rev->major_ver, rev->minor_ver, rev->vendor_id,
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rev->sub_vendor_id, rev->impl_ver);
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dev_dbg(dev, "Found %d protocol(s) %d agent(s)\n", rev->num_protocols,
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rev->num_agents);
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for (id = 0; id < rev->num_agents; id++) {
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scmi_base_discover_agent_get(handle, id, name);
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dev_dbg(dev, "Agent %d: %s\n", id, name);
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}
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return 0;
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}
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