123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105 |
- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Copyright (C) 2020 Linaro Limited.
- */
- #define LOG_CATEGORY UCLASS_SCMI_AGENT
- #include <common.h>
- #include <dm.h>
- #include <errno.h>
- #include <mailbox.h>
- #include <scmi_agent.h>
- #include <scmi_agent-uclass.h>
- #include <dm/device_compat.h>
- #include <dm/devres.h>
- #include <linux/compat.h>
- #include "smt.h"
- #define TIMEOUT_US_10MS 10000
- /**
- * struct scmi_mbox_channel - Description of an SCMI mailbox transport
- * @smt: Shared memory buffer
- * @mbox: Mailbox channel description
- * @timeout_us: Timeout in microseconds for the mailbox transfer
- */
- struct scmi_mbox_channel {
- struct scmi_smt smt;
- struct mbox_chan mbox;
- ulong timeout_us;
- };
- static int scmi_mbox_process_msg(struct udevice *dev, struct scmi_msg *msg)
- {
- struct scmi_mbox_channel *chan = dev_get_priv(dev);
- int ret;
- ret = scmi_write_msg_to_smt(dev, &chan->smt, msg);
- if (ret)
- return ret;
- /* Give shm addr to mbox in case it is meaningful */
- ret = mbox_send(&chan->mbox, chan->smt.buf);
- if (ret) {
- dev_err(dev, "Message send failed: %d\n", ret);
- goto out;
- }
- /* Receive the response */
- ret = mbox_recv(&chan->mbox, chan->smt.buf, chan->timeout_us);
- if (ret) {
- dev_err(dev, "Response failed: %d, abort\n", ret);
- goto out;
- }
- ret = scmi_read_resp_from_smt(dev, &chan->smt, msg);
- out:
- scmi_clear_smt_channel(&chan->smt);
- return ret;
- }
- int scmi_mbox_probe(struct udevice *dev)
- {
- struct scmi_mbox_channel *chan = dev_get_priv(dev);
- int ret;
- chan->timeout_us = TIMEOUT_US_10MS;
- ret = mbox_get_by_index(dev, 0, &chan->mbox);
- if (ret) {
- dev_err(dev, "Failed to find mailbox: %d\n", ret);
- goto out;
- }
- ret = scmi_dt_get_smt_buffer(dev, &chan->smt);
- if (ret)
- dev_err(dev, "Failed to get shm resources: %d\n", ret);
- out:
- if (ret)
- devm_kfree(dev, chan);
- return ret;
- }
- static const struct udevice_id scmi_mbox_ids[] = {
- { .compatible = "arm,scmi" },
- { }
- };
- static const struct scmi_agent_ops scmi_mbox_ops = {
- .process_msg = scmi_mbox_process_msg,
- };
- U_BOOT_DRIVER(scmi_mbox) = {
- .name = "scmi-over-mailbox",
- .id = UCLASS_SCMI_AGENT,
- .of_match = scmi_mbox_ids,
- .priv_auto = sizeof(struct scmi_mbox_channel),
- .probe = scmi_mbox_probe,
- .ops = &scmi_mbox_ops,
- };
|