cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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mtk-adsp-ipc.c (3621B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * Copyright (c) 2022 MediaTek Corporation. All rights reserved.
      4 * Author: Allen-KH Cheng <allen-kh.cheng@mediatek.com>
      5 */
      6
      7#include <linux/firmware/mediatek/mtk-adsp-ipc.h>
      8#include <linux/kernel.h>
      9#include <linux/mailbox_client.h>
     10#include <linux/module.h>
     11#include <linux/of_platform.h>
     12#include <linux/platform_device.h>
     13#include <linux/slab.h>
     14
     15/*
     16 * mtk_adsp_ipc_send - send ipc cmd to MTK ADSP
     17 *
     18 * @ipc: ADSP IPC handle
     19 * @idx: index of the mailbox channel
     20 * @msg: IPC cmd (reply or request)
     21 *
     22 * Returns zero for success from mbox_send_message
     23 * negative value for error
     24 */
     25int mtk_adsp_ipc_send(struct mtk_adsp_ipc *ipc, unsigned int idx, uint32_t msg)
     26{
     27	struct mtk_adsp_chan *adsp_chan;
     28	int ret;
     29
     30	if (idx >= MTK_ADSP_MBOX_NUM)
     31		return -EINVAL;
     32
     33	adsp_chan = &ipc->chans[idx];
     34	ret = mbox_send_message(adsp_chan->ch, &msg);
     35	if (ret < 0)
     36		return ret;
     37
     38	return 0;
     39}
     40EXPORT_SYMBOL_GPL(mtk_adsp_ipc_send);
     41
     42/*
     43 * mtk_adsp_ipc_recv - recv callback used by MTK ADSP mailbox
     44 *
     45 * @c: mbox client
     46 * @msg: message received
     47 *
     48 * Users of ADSP IPC will need to privde handle_reply and handle_request
     49 * callbacks.
     50 */
     51static void mtk_adsp_ipc_recv(struct mbox_client *c, void *msg)
     52{
     53	struct mtk_adsp_chan *chan = container_of(c, struct mtk_adsp_chan, cl);
     54	struct device *dev = c->dev;
     55
     56	switch (chan->idx) {
     57	case MTK_ADSP_MBOX_REPLY:
     58		chan->ipc->ops->handle_reply(chan->ipc);
     59		break;
     60	case MTK_ADSP_MBOX_REQUEST:
     61		chan->ipc->ops->handle_request(chan->ipc);
     62		break;
     63	default:
     64		dev_err(dev, "wrong mbox chan %d\n", chan->idx);
     65		break;
     66	}
     67}
     68
     69static int mtk_adsp_ipc_probe(struct platform_device *pdev)
     70{
     71	struct device *dev = &pdev->dev;
     72	struct mtk_adsp_ipc *adsp_ipc;
     73	struct mtk_adsp_chan *adsp_chan;
     74	struct mbox_client *cl;
     75	char *chan_name;
     76	int ret;
     77	int i, j;
     78
     79	device_set_of_node_from_dev(&pdev->dev, pdev->dev.parent);
     80
     81	adsp_ipc = devm_kzalloc(dev, sizeof(*adsp_ipc), GFP_KERNEL);
     82	if (!adsp_ipc)
     83		return -ENOMEM;
     84
     85	for (i = 0; i < MTK_ADSP_MBOX_NUM; i++) {
     86		chan_name = kasprintf(GFP_KERNEL, "mbox%d", i);
     87		if (!chan_name) {
     88			ret = -ENOMEM;
     89			goto out;
     90		}
     91
     92		adsp_chan = &adsp_ipc->chans[i];
     93		cl = &adsp_chan->cl;
     94		cl->dev = dev->parent;
     95		cl->tx_block = false;
     96		cl->knows_txdone = false;
     97		cl->tx_prepare = NULL;
     98		cl->rx_callback = mtk_adsp_ipc_recv;
     99
    100		adsp_chan->ipc = adsp_ipc;
    101		adsp_chan->idx = i;
    102		adsp_chan->ch = mbox_request_channel_byname(cl, chan_name);
    103		if (IS_ERR(adsp_chan->ch)) {
    104			ret = PTR_ERR(adsp_chan->ch);
    105			if (ret != -EPROBE_DEFER)
    106				dev_err(dev, "Failed to request mbox chan %d ret %d\n",
    107					i, ret);
    108			goto out_free;
    109		}
    110
    111		dev_dbg(dev, "request mbox chan %s\n", chan_name);
    112		kfree(chan_name);
    113	}
    114
    115	adsp_ipc->dev = dev;
    116	dev_set_drvdata(dev, adsp_ipc);
    117	dev_dbg(dev, "MTK ADSP IPC initialized\n");
    118
    119	return 0;
    120
    121out_free:
    122	kfree(chan_name);
    123out:
    124	for (j = 0; j < i; j++) {
    125		adsp_chan = &adsp_ipc->chans[j];
    126		mbox_free_channel(adsp_chan->ch);
    127	}
    128
    129	return ret;
    130}
    131
    132static int mtk_adsp_ipc_remove(struct platform_device *pdev)
    133{
    134	struct mtk_adsp_ipc *adsp_ipc = dev_get_drvdata(&pdev->dev);
    135	struct mtk_adsp_chan *adsp_chan;
    136	int i;
    137
    138	for (i = 0; i < MTK_ADSP_MBOX_NUM; i++) {
    139		adsp_chan = &adsp_ipc->chans[i];
    140		mbox_free_channel(adsp_chan->ch);
    141	}
    142
    143	return 0;
    144}
    145
    146static struct platform_driver mtk_adsp_ipc_driver = {
    147	.driver = {
    148		.name = "mtk-adsp-ipc",
    149	},
    150	.probe = mtk_adsp_ipc_probe,
    151	.remove = mtk_adsp_ipc_remove,
    152};
    153builtin_platform_driver(mtk_adsp_ipc_driver);
    154
    155MODULE_AUTHOR("Allen-KH Cheng <allen-kh.cheng@mediatek.com>");
    156MODULE_DESCRIPTION("MTK ADSP IPC Driver");
    157MODULE_LICENSE("GPL");