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