Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
From:   peng.fan@nxp.com
To:     shawnguo@kernel.org, s.hauer@pengutronix.de,
        jassisinghbrar@gmail.com, leonard.crestez@nxp.com,
        o.rempel@pengutronix.de
Cc:     kernel@pengutronix.de, festevam@gmail.com, linux-imx@nxp.com,
        m.felsch@pengutronix.de, hongxing.zhu@nxp.com,
        aisheng.dong@nxp.com, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        Peng Fan <peng.fan@nxp.com>
Subject: [PATCH 3/3] firmware: imx-scu: Support one TX and one RX
Date:   Mon, 24 Feb 2020 20:14:34 +0800
Message-Id: <1582546474-21721-4-git-send-email-peng.fan@nxp.com>
In-Reply-To: <1582546474-21721-1-git-send-email-peng.fan@nxp.com>
References: <1582546474-21721-1-git-send-email-peng.fan@nxp.com>
Content-Type: text/plain
MIME-Version: 1.0
X-MS-Exchange-MessageSentRepresentingType: 1
Received: from localhost.localdomain (119.31.174.66) by HK2PR04CA0077.apcprd04.prod.outlook.com (2603:1096:202:15::21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256) id 15.20.2750.18 via Frontend Transport; Mon, 24 Feb 2020 12:21:03 +0000
X-Mailer: git-send-email 2.7.4
X-Originating-IP: [119.31.174.66]
X-MS-PublicTrafficType: Email
X-MS-Office365-Filtering-HT: Tenant
X-MS-Office365-Filtering-Correlation-Id: 2aed960e-9267-41ec-9798-08d7b92406a5
X-MS-TrafficTypeDiagnostic: AM0PR04MB4433:|AM0PR04MB4433:
X-MS-Exchange-Transport-Forked: True
X-Microsoft-Antispam-PRVS: <AM0PR04MB443342150F25994A4BB6126C88EC0@AM0PR04MB4433.eurprd04.prod.outlook.com>
X-MS-Oob-TLC-OOBClassifiers: OLM:4303;
X-Forefront-PRVS: 032334F434
X-Forefront-Antispam-Report: SFV:NSPM;SFS:(10009020)(4636009)(366004)(376002)(346002)(396003)(136003)(39860400002)(199004)(189003)(2906002)(66476007)(69590400006)(8676002)(66556008)(6666004)(52116002)(81156014)(8936002)(81166006)(66946007)(7416002)(6486002)(36756003)(16526019)(6506007)(4326008)(2616005)(6512007)(478600001)(956004)(26005)(86362001)(316002)(186003)(9686003)(5660300002)(83323001);DIR:OUT;SFP:1101;SCL:1;SRVR:AM0PR04MB4433;H:AM0PR04MB4481.eurprd04.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;A:1;MX:1;
Received-SPF: None (protection.outlook.com: nxp.com does not designate
 permitted sender hosts)
X-MS-Exchange-SenderADCheck: 1
X-Microsoft-Antispam: BCL:0;
X-Microsoft-Antispam-Message-Info: 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
X-MS-Exchange-AntiSpam-MessageData: zq4AtmVC87q3PVrMj6tzaSvYFw1Zq4Z18jYcH49ml0EfcifUpiulrHY5RiGYqmgSx+CqOsXs66qZdAF76WDgXr0TWk6OO6LU6ZCP9xcpdyZxeFjkk1S+6JOE4gqR5ffNfTgUIFNuC9oy53tUhZDchw==
X-OriginatorOrg: nxp.com
X-MS-Exchange-CrossTenant-Network-Message-Id: 2aed960e-9267-41ec-9798-08d7b92406a5
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Feb 2020 12:21:07.9600
 (UTC)
X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted
X-MS-Exchange-CrossTenant-Id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635
X-MS-Exchange-CrossTenant-MailboxType: HOSTED
X-MS-Exchange-CrossTenant-UserPrincipalName: wR+dlEfmnEwvGvp7iCT8awYFzyJxqgAwKUc5eJ3siae9erfm71/lelcn5GG/5ey56ybicyqJgYH9AfEEvY2o/Q==
X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM0PR04MB4433
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

From: Peng Fan <peng.fan@nxp.com>

Current imx-scu requires four TX and four RX to communicate with
SCU. This is low efficient and causes lots of mailbox interrupts.

With imx-mailbox driver could support one TX to use all four transmit
registers and one RX to use all four receive registers, imx-scu
could use one TX and one RX.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
---
 drivers/firmware/imx/imx-scu.c | 54 +++++++++++++++++++++++++++++++++---------
 1 file changed, 43 insertions(+), 11 deletions(-)

diff --git a/drivers/firmware/imx/imx-scu.c b/drivers/firmware/imx/imx-scu.c
index f71eaa5bf52d..953446b3d5e5 100644
--- a/drivers/firmware/imx/imx-scu.c
+++ b/drivers/firmware/imx/imx-scu.c
@@ -38,6 +38,7 @@ struct imx_sc_ipc {
 	struct device *dev;
 	struct mutex lock;
 	struct completion done;
+	bool fast_ipc;
 
 	/* temporarily store the SCU msg */
 	u32 *msg;
@@ -115,6 +116,7 @@ static void imx_scu_rx_callback(struct mbox_client *c, void *msg)
 	struct imx_sc_ipc *sc_ipc = sc_chan->sc_ipc;
 	struct imx_sc_rpc_msg *hdr;
 	u32 *data = msg;
+	int i;
 
 	if (!sc_ipc->msg) {
 		dev_warn(sc_ipc->dev, "unexpected rx idx %d 0x%08x, ignore!\n",
@@ -122,6 +124,19 @@ static void imx_scu_rx_callback(struct mbox_client *c, void *msg)
 		return;
 	}
 
+	if (sc_ipc->fast_ipc) {
+		hdr = msg;
+		sc_ipc->rx_size = hdr->size;
+		sc_ipc->msg[0] = *data++;
+
+		for (i = 1; i < sc_ipc->rx_size; i++)
+			sc_ipc->msg[i] = *data++;
+
+		complete(&sc_ipc->done);
+
+		return;
+	}
+
 	if (sc_chan->idx == 0) {
 		hdr = msg;
 		sc_ipc->rx_size = hdr->size;
@@ -147,6 +162,7 @@ static int imx_scu_ipc_write(struct imx_sc_ipc *sc_ipc, void *msg)
 	struct imx_sc_chan *sc_chan;
 	u32 *data = msg;
 	int ret;
+	int size;
 	int i;
 
 	/* Check size */
@@ -156,7 +172,8 @@ static int imx_scu_ipc_write(struct imx_sc_ipc *sc_ipc, void *msg)
 	dev_dbg(sc_ipc->dev, "RPC SVC %u FUNC %u SIZE %u\n", hdr->svc,
 		hdr->func, hdr->size);
 
-	for (i = 0; i < hdr->size; i++) {
+	size = sc_ipc->fast_ipc ? 1 : hdr->size;
+	for (i = 0; i < size; i++) {
 		sc_chan = &sc_ipc->chans[i % 4];
 
 		/*
@@ -168,8 +185,10 @@ static int imx_scu_ipc_write(struct imx_sc_ipc *sc_ipc, void *msg)
 		 * Wait for tx_done before every send to ensure that no
 		 * queueing happens at the mailbox channel level.
 		 */
-		wait_for_completion(&sc_chan->tx_done);
-		reinit_completion(&sc_chan->tx_done);
+		if (!sc_ipc->fast_ipc) {
+			wait_for_completion(&sc_chan->tx_done);
+			reinit_completion(&sc_chan->tx_done);
+		}
 
 		ret = mbox_send_message(sc_chan->ch, &data[i]);
 		if (ret < 0)
@@ -246,6 +265,8 @@ static int imx_scu_probe(struct platform_device *pdev)
 	struct imx_sc_chan *sc_chan;
 	struct mbox_client *cl;
 	char *chan_name;
+	struct of_phandle_args args;
+	int num_channel;
 	int ret;
 	int i;
 
@@ -253,11 +274,20 @@ static int imx_scu_probe(struct platform_device *pdev)
 	if (!sc_ipc)
 		return -ENOMEM;
 
-	for (i = 0; i < SCU_MU_CHAN_NUM; i++) {
-		if (i < 4)
+	ret = of_parse_phandle_with_args(pdev->dev.of_node, "mboxes",
+					 "#mbox-cells", 0, &args);
+	if (ret)
+		return ret;
+
+	sc_ipc->fast_ipc = of_property_read_bool(args.np, "fsl,scu");
+
+	num_channel = sc_ipc->fast_ipc ? 2 : SCU_MU_CHAN_NUM;
+	for (i = 0; i < num_channel; i++) {
+		if (i < num_channel / 2)
 			chan_name = kasprintf(GFP_KERNEL, "tx%d", i);
 		else
-			chan_name = kasprintf(GFP_KERNEL, "rx%d", i - 4);
+			chan_name = kasprintf(GFP_KERNEL, "rx%d",
+					      i - num_channel / 2);
 
 		if (!chan_name)
 			return -ENOMEM;
@@ -269,13 +299,15 @@ static int imx_scu_probe(struct platform_device *pdev)
 		cl->knows_txdone = true;
 		cl->rx_callback = imx_scu_rx_callback;
 
-		/* Initial tx_done completion as "done" */
-		cl->tx_done = imx_scu_tx_done;
-		init_completion(&sc_chan->tx_done);
-		complete(&sc_chan->tx_done);
+		if (!sc_ipc->fast_ipc) {
+			/* Initial tx_done completion as "done" */
+			cl->tx_done = imx_scu_tx_done;
+			init_completion(&sc_chan->tx_done);
+			complete(&sc_chan->tx_done);
+		}
 
 		sc_chan->sc_ipc = sc_ipc;
-		sc_chan->idx = i % 4;
+		sc_chan->idx = i % (num_channel / 2);
 		sc_chan->ch = mbox_request_channel_byname(cl, chan_name);
 		if (IS_ERR(sc_chan->ch)) {
 			ret = PTR_ERR(sc_chan->ch);
-- 
2.16.4