151 lines
3.1 KiB
C
151 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2020 Linaro Limited.
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*/
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#define LOG_CATEGORY UCLASS_SCMI_AGENT
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#include <common.h>
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#include <dm.h>
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#include <errno.h>
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#include <mailbox.h>
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#include <scmi_agent.h>
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#include <scmi_agent-uclass.h>
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#include <dm/device_compat.h>
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#include <dm/devres.h>
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#include <linux/compat.h>
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#include "smt.h"
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#define TIMEOUT_US_10MS 10000
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/**
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* struct scmi_mbox_channel - Description of an SCMI mailbox transport
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* @smt: Shared memory buffer
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* @mbox: Mailbox channel description
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* @timeout_us: Timeout in microseconds for the mailbox transfer
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*/
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struct scmi_mbox_channel {
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struct scmi_smt smt;
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struct mbox_chan mbox;
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ulong timeout_us;
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};
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/**
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* struct scmi_channel - Channel instance referenced in SCMI drivers
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* @ref: Reference to local channel instance
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**/
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struct scmi_channel {
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struct scmi_mbox_channel ref;
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};
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static int scmi_mbox_process_msg(struct udevice *dev,
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struct scmi_channel *channel,
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struct scmi_msg *msg)
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{
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struct scmi_mbox_channel *chan = &channel->ref;
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int ret;
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ret = scmi_write_msg_to_smt(dev, &chan->smt, msg);
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if (ret)
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return ret;
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/* Give shm addr to mbox in case it is meaningful */
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ret = mbox_send(&chan->mbox, chan->smt.buf);
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if (ret) {
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dev_err(dev, "Message send failed: %d\n", ret);
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goto out;
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}
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/* Receive the response */
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ret = mbox_recv(&chan->mbox, chan->smt.buf, chan->timeout_us);
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if (ret) {
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dev_err(dev, "Response failed: %d, abort\n", ret);
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goto out;
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}
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ret = scmi_read_resp_from_smt(dev, &chan->smt, msg);
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out:
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scmi_clear_smt_channel(&chan->smt);
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return ret;
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}
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static int setup_channel(struct udevice *dev, struct scmi_mbox_channel *chan)
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{
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int ret;
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ret = mbox_get_by_index(dev, 0, &chan->mbox);
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if (ret) {
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dev_err(dev, "Failed to find mailbox: %d\n", ret);
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return ret;
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}
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ret = scmi_dt_get_smt_buffer(dev, &chan->smt);
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if (ret) {
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dev_err(dev, "Failed to get shm resources: %d\n", ret);
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return ret;
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}
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chan->timeout_us = TIMEOUT_US_10MS;
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return 0;
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}
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static int scmi_mbox_get_channel(struct udevice *dev,
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struct scmi_channel **channel)
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{
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struct scmi_mbox_channel *base_chan = dev_get_plat(dev->parent);
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struct scmi_mbox_channel *chan;
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int ret;
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if (!dev_read_prop(dev, "shmem", NULL)) {
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/* Uses agent base channel */
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*channel = container_of(base_chan, struct scmi_channel, ref);
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return 0;
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}
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chan = calloc(1, sizeof(*chan));
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if (!chan)
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return -ENOMEM;
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/* Setup a dedicated channel for the protocol */
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ret = setup_channel(dev, chan);
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if (ret) {
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free(chan);
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return ret;
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}
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*channel = (void *)chan;
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return 0;
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}
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int scmi_mbox_of_to_plat(struct udevice *dev)
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{
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struct scmi_mbox_channel *chan = dev_get_plat(dev);
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return setup_channel(dev, chan);
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}
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static const struct udevice_id scmi_mbox_ids[] = {
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{ .compatible = "arm,scmi" },
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{ }
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};
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static const struct scmi_agent_ops scmi_mbox_ops = {
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.of_get_channel = scmi_mbox_get_channel,
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.process_msg = scmi_mbox_process_msg,
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};
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U_BOOT_DRIVER(scmi_mbox) = {
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.name = "scmi-over-mailbox",
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.id = UCLASS_SCMI_AGENT,
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.of_match = scmi_mbox_ids,
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.plat_auto = sizeof(struct scmi_mbox_channel),
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.of_to_plat = scmi_mbox_of_to_plat,
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.ops = &scmi_mbox_ops,
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};
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