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41575d8e4c
This construct is quite long-winded. In earlier days it made some sense since auto-allocation was a strange concept. But with driver model now used pretty universally, we can shorten this to 'auto'. This reduces verbosity and makes it easier to read. Coincidentally it also ensures that every declaration is on one line, thus making dtoc's job easier. Signed-off-by: Simon Glass <sjg@chromium.org>
103 lines
2.1 KiB
C
103 lines
2.1 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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#include <common.h>
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#include <dm.h>
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#include <dm/device_compat.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/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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static int scmi_mbox_process_msg(struct udevice *dev, struct scmi_msg *msg)
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{
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struct scmi_mbox_channel *chan = dev_get_priv(dev);
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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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int scmi_mbox_probe(struct udevice *dev)
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{
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struct scmi_mbox_channel *chan = dev_get_priv(dev);
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int ret;
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chan->timeout_us = TIMEOUT_US_10MS;
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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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goto out;
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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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out:
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if (ret)
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devm_kfree(dev, chan);
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return ret;
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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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.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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.priv_auto = sizeof(struct scmi_mbox_channel),
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.probe = scmi_mbox_probe,
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.ops = &scmi_mbox_ops,
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};
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