Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 144 insertions, 0 deletions

diff --git a/drivers/firmware/mtk-adsp-ipc.c b/drivers/firmware/mtk-adsp-ipc.c
new file mode 100644
index 0000000000..85e94ddc72
--- /dev/null
+++ b/drivers/firmware/mtk-adsp-ipc.c
@@ -0,0 +1,144 @@
+// 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 int 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);
+	}
+
+	return 0;
+}
+
+static struct platform_driver mtk_adsp_ipc_driver = {
+	.driver = {
+		.name = "mtk-adsp-ipc",
+	},
+	.probe = mtk_adsp_ipc_probe,
+	.remove = 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");