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d678a59d2d
When bringing in the series 'arm: dts: am62-beagleplay: Fix Beagleplay Ethernet"' I failed to notice that b4 noticed it was based on next and so took that as the base commit and merged that part of next to master. This reverts commitc8ffd1356d, reversing changes made to2ee6f3a5f7. Reported-by: Jonas Karlman <jonas@kwiboo.se> Signed-off-by: Tom Rini <trini@konsulko.com>
152 lines
3.1 KiB
C
152 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 udevice *protocol,
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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);
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struct scmi_mbox_channel *chan;
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int ret;
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if (!dev_read_prop(protocol, "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(protocol, 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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