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 */ 25 int 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 } 40 EXPORT_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 */ 51 static 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 69 static 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; 120 121 out_free: 122 kfree(chan_name); 123 out: 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 } 131 132 static 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 } 145 146 static 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 }; 153 builtin_platform_driver(mtk_adsp_ipc_driver); 154 155 MODULE_AUTHOR("Allen-KH Cheng <allen-kh.cheng@mediatek.com>"); 156 MODULE_DESCRIPTION("MTK ADSP IPC Driver"); 157 MODULE_LICENSE("GPL"); 158