// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Rockchip MBOX Demo.
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*
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* Copyright (c) 2023 Rockchip Electronics Co. Ltd.
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* Author: Jiahang Zheng <jiahang.zheng@rock-chips.com>
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*/
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/mailbox_client.h>
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#include <linux/mailbox_controller.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/of_reserved_mem.h>
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#include <linux/platform_device.h>
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#include <soc/rockchip/rockchip-mailbox.h>
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#include <linux/delay.h>
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/*
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* The Linux kernel uses the mailbox framework TXDONE_BY_POLL mechanism.
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* The minimum unit of the txpoll period interface is ms.
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* Configure rockchip,txpoll-period-ms = <1> in dts.
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* If data that is longer than MBOX_TX_QUEUE_LEN may be lost,
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* each send should be at least interval txpoll-period-ms
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*/
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#define MSG_LIMIT (100)
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#define LINUX_TEST_COMPENSATION (1)
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struct rk_mbox_dev {
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struct platform_device *pdev;
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struct mbox_client mbox_cl;
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struct mbox_chan *mbox_rx_chan;
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struct mbox_chan *mbox_tx_chan;
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struct rockchip_mbox_msg tx_msg;
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int rx_count;
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};
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static void rk_mbox_rx_callback(struct mbox_client *client, void *message)
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{
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struct rk_mbox_dev *test_dev = container_of(client, struct rk_mbox_dev, mbox_cl);
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struct platform_device *pdev = test_dev->pdev;
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struct device *dev = &pdev->dev;
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struct rockchip_mbox_msg *tx_msg;
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struct rockchip_mbox_msg *rx_msg;
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rx_msg = message;
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dev_info(dev, "mbox master: rx_count:%d cmd=0x%x data=0x%x\n",
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++test_dev->rx_count, rx_msg->cmd, rx_msg->data);
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/* test should not live forever */
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if (test_dev->rx_count >= MSG_LIMIT) {
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dev_info(dev, "Rockchip mbox test exit!\n");
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return;
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}
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mdelay(LINUX_TEST_COMPENSATION);
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tx_msg = &test_dev->tx_msg;
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mbox_send_message(test_dev->mbox_tx_chan, tx_msg);
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}
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static int mbox_demo_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct rk_mbox_dev *test_dev = NULL;
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struct mbox_client *cl;
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struct rockchip_mbox_msg *tx_msg;
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int ret = 0;
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test_dev = devm_kzalloc(dev, sizeof(*test_dev), GFP_KERNEL);
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if (!test_dev)
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return -ENOMEM;
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/* link_id: master core 0 and remote core 3 */
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tx_msg = &test_dev->tx_msg;
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tx_msg->cmd = 0x03U;
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tx_msg->data = 0x524D5347U;
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dev_info(dev, "rockchip mbox demo probe.\n");
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test_dev->pdev = pdev;
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test_dev->rx_count = 0;
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cl = &test_dev->mbox_cl;
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cl->dev = dev;
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cl->rx_callback = rk_mbox_rx_callback;
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platform_set_drvdata(pdev, test_dev);
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test_dev->mbox_rx_chan = mbox_request_channel_byname(cl, "test-rx");
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if (IS_ERR(test_dev->mbox_rx_chan)) {
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ret = PTR_ERR(test_dev->mbox_rx_chan);
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dev_err(dev, "failed to request mbox rx chan, ret %d\n", ret);
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return ret;
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}
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test_dev->mbox_tx_chan = mbox_request_channel_byname(cl, "test-tx");
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if (IS_ERR(test_dev->mbox_tx_chan)) {
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ret = PTR_ERR(test_dev->mbox_tx_chan);
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dev_err(dev, "failed to request mbox tx chan, ret %d\n", ret);
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return ret;
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}
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dev_info(dev, "mbox master: send cmd=0x%x data=0x%x\n", tx_msg->cmd, tx_msg->data);
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mbox_send_message(test_dev->mbox_tx_chan, tx_msg);
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return ret;
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}
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static int mbox_demo_remove(struct platform_device *pdev)
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{
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struct rk_mbox_dev *test_dev = platform_get_drvdata(pdev);
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mbox_free_channel(test_dev->mbox_rx_chan);
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mbox_free_channel(test_dev->mbox_tx_chan);
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return 0;
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}
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static const struct of_device_id mbox_demo_match[] = {
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{ .compatible = "rockchip,mbox-demo", },
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{ /* sentinel */ },
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};
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MODULE_DEVICE_TABLE(of, mbox_demo_match);
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static struct platform_driver mbox_demo_driver = {
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.probe = mbox_demo_probe,
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.remove = mbox_demo_remove,
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.driver = {
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.name = "mbox-demo",
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.of_match_table = mbox_demo_match,
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},
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};
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module_platform_driver(mbox_demo_driver);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Rockchip MBOX Demo");
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MODULE_AUTHOR("Jiahang Zheng <jiahang.zheng@rock-chips.com>");
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