167 lines
4.1 KiB
C
167 lines
4.1 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2016,2017 ARM Ltd.
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* Copyright 2019 NXP
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*/
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#include <linux/arm-smccc.h>
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/mailbox_controller.h>
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#include <linux/mailbox/arm-smccc-mbox.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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typedef unsigned long (smc_mbox_fn)(unsigned int, unsigned long,
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unsigned long, unsigned long,
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unsigned long, unsigned long,
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unsigned long);
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struct arm_smc_chan_data {
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unsigned int function_id;
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smc_mbox_fn *invoke_smc_mbox_fn;
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};
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static int arm_smc_send_data(struct mbox_chan *link, void *data)
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{
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struct arm_smc_chan_data *chan_data = link->con_priv;
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struct arm_smccc_mbox_cmd *cmd = data;
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unsigned long ret;
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if (ARM_SMCCC_IS_64(chan_data->function_id)) {
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ret = chan_data->invoke_smc_mbox_fn(chan_data->function_id,
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cmd->args_smccc64[0],
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cmd->args_smccc64[1],
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cmd->args_smccc64[2],
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cmd->args_smccc64[3],
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cmd->args_smccc64[4],
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cmd->args_smccc64[5]);
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} else {
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ret = chan_data->invoke_smc_mbox_fn(chan_data->function_id,
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cmd->args_smccc32[0],
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cmd->args_smccc32[1],
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cmd->args_smccc32[2],
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cmd->args_smccc32[3],
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cmd->args_smccc32[4],
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cmd->args_smccc32[5]);
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}
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mbox_chan_received_data(link, (void *)ret);
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return 0;
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}
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static unsigned long __invoke_fn_hvc(unsigned int function_id,
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unsigned long arg0, unsigned long arg1,
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unsigned long arg2, unsigned long arg3,
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unsigned long arg4, unsigned long arg5)
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{
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struct arm_smccc_res res;
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arm_smccc_hvc(function_id, arg0, arg1, arg2, arg3, arg4,
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arg5, 0, &res);
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return res.a0;
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}
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static unsigned long __invoke_fn_smc(unsigned int function_id,
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unsigned long arg0, unsigned long arg1,
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unsigned long arg2, unsigned long arg3,
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unsigned long arg4, unsigned long arg5)
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{
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struct arm_smccc_res res;
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arm_smccc_smc(function_id, arg0, arg1, arg2, arg3, arg4,
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arg5, 0, &res);
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return res.a0;
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}
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static const struct mbox_chan_ops arm_smc_mbox_chan_ops = {
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.send_data = arm_smc_send_data,
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};
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static struct mbox_chan *
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arm_smc_mbox_of_xlate(struct mbox_controller *mbox,
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const struct of_phandle_args *sp)
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{
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return mbox->chans;
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}
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static int arm_smc_mbox_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct mbox_controller *mbox;
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struct arm_smc_chan_data *chan_data;
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int ret;
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mbox = devm_kzalloc(dev, sizeof(*mbox), GFP_KERNEL);
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if (!mbox)
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return -ENOMEM;
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mbox->of_xlate = arm_smc_mbox_of_xlate;
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mbox->num_chans = 1;
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mbox->chans = devm_kzalloc(dev, sizeof(*mbox->chans), GFP_KERNEL);
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if (!mbox->chans)
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return -ENOMEM;
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chan_data = devm_kzalloc(dev, sizeof(*chan_data), GFP_KERNEL);
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if (!chan_data)
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return -ENOMEM;
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ret = of_property_read_u32(dev->of_node, "arm,func-id",
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&chan_data->function_id);
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if (ret)
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return ret;
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if (of_device_is_compatible(dev->of_node, "arm,smc-mbox"))
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chan_data->invoke_smc_mbox_fn = __invoke_fn_smc;
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else
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chan_data->invoke_smc_mbox_fn = __invoke_fn_hvc;
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mbox->chans->con_priv = chan_data;
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mbox->txdone_poll = false;
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mbox->txdone_irq = false;
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mbox->ops = &arm_smc_mbox_chan_ops;
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mbox->dev = dev;
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platform_set_drvdata(pdev, mbox);
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ret = devm_mbox_controller_register(dev, mbox);
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if (ret)
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return ret;
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dev_info(dev, "ARM SMC mailbox enabled.\n");
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return ret;
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}
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static int arm_smc_mbox_remove(struct platform_device *pdev)
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{
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struct mbox_controller *mbox = platform_get_drvdata(pdev);
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mbox_controller_unregister(mbox);
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return 0;
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}
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static const struct of_device_id arm_smc_mbox_of_match[] = {
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{ .compatible = "arm,smc-mbox", },
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{ .compatible = "arm,hvc-mbox", },
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{},
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};
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MODULE_DEVICE_TABLE(of, arm_smc_mbox_of_match);
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static struct platform_driver arm_smc_mbox_driver = {
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.driver = {
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.name = "arm-smc-mbox",
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.of_match_table = arm_smc_mbox_of_match,
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},
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.probe = arm_smc_mbox_probe,
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.remove = arm_smc_mbox_remove,
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};
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module_platform_driver(arm_smc_mbox_driver);
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MODULE_AUTHOR("Peng Fan <peng.fan@nxp.com>");
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MODULE_DESCRIPTION("Generic ARM smc mailbox driver");
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MODULE_LICENSE("GPL v2");
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