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:     sudeep.holla@arm.com, robh+dt@kernel.org
Cc:     viresh.kumar@linaro.org, f.fainelli@gmail.com, linux-imx@nxp.com,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        devicetree@vger.kernel.org, Peng Fan <peng.fan@nxp.com>
Subject: [PATCH V5 2/2] firmware: arm_scmi: add smc/hvc transport
Date:   Sun,  8 Mar 2020 21:24:39 +0800
Message-Id: <1583673879-20714-3-git-send-email-peng.fan@nxp.com>
In-Reply-To: <1583673879-20714-1-git-send-email-peng.fan@nxp.com>
References: <1583673879-20714-1-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 SG2PR01CA0116.apcprd01.prod.exchangelabs.com (2603:1096:4:40::20) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256) id 15.20.2793.14 via Frontend Transport; Sun, 8 Mar 2020 13:31:07 +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: 80cda6e6-f553-48fc-3a32-08d7c364f68a
X-MS-TrafficTypeDiagnostic: AM0PR04MB6275:|AM0PR04MB6275:
X-MS-Exchange-Transport-Forked: True
X-Microsoft-Antispam-PRVS: <AM0PR04MB6275CA614591ED1FD09FF40788E10@AM0PR04MB6275.eurprd04.prod.outlook.com>
X-MS-Oob-TLC-OOBClassifiers: OLM:4941;
X-Forefront-PRVS: 03361FCC43
X-Forefront-Antispam-Report: SFV:NSPM;SFS:(10009020)(4636009)(39850400004)(396003)(366004)(346002)(376002)(136003)(199004)(189003)(5660300002)(16526019)(186003)(2616005)(956004)(2906002)(4326008)(6506007)(6512007)(6666004)(9686003)(52116002)(66556008)(6486002)(81156014)(81166006)(86362001)(478600001)(8676002)(316002)(66946007)(66476007)(26005)(36756003)(69590400007)(8936002);DIR:OUT;SFP:1101;SCL:1;SRVR:AM0PR04MB6275;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: jiLIqD8npSxqKI5BZF4sKg3SetXMMJ+Z121mcOKrsEkVRjlB70Aed5+nUByBTocBMiOohLanziOR/3diGwMwrtroxZlttwlaY1iIRhlaruJM+k7PqlBuJjQihhhONmVXeVvsH+U78AiUWXfuWKy1Ng==
X-OriginatorOrg: nxp.com
X-MS-Exchange-CrossTenant-Network-Message-Id: 80cda6e6-f553-48fc-3a32-08d7c364f68a
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 08 Mar 2020 13:31:10.7917
 (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: qYwwHUwFFDkV4gBoElqKcg2uRHp7LXd53wpn/XOPb1ZpZDmgnB4tHqT9HBWOY8H+fVSMA6C0fBDaFr04AhymHg==
X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM0PR04MB6275
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>

Take arm,smc-id as the 1st arg, leave the other args as zero for now.
There is no Rx, only Tx because of smc/hvc not support Rx.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
---
 drivers/firmware/arm_scmi/Makefile |   2 +-
 drivers/firmware/arm_scmi/common.h |   1 +
 drivers/firmware/arm_scmi/driver.c |   1 +
 drivers/firmware/arm_scmi/smc.c    | 152 +++++++++++++++++++++++++++++++++++++
 4 files changed, 155 insertions(+), 1 deletion(-)
 create mode 100644 drivers/firmware/arm_scmi/smc.c

diff --git a/drivers/firmware/arm_scmi/Makefile b/drivers/firmware/arm_scmi/Makefile
index 6694d0d908d6..6b1b0d6c6d0e 100644
--- a/drivers/firmware/arm_scmi/Makefile
+++ b/drivers/firmware/arm_scmi/Makefile
@@ -2,6 +2,6 @@
 obj-y	= scmi-bus.o scmi-driver.o scmi-protocols.o scmi-transport.o
 scmi-bus-y = bus.o
 scmi-driver-y = driver.o
-scmi-transport-y = mailbox.o shmem.o
+scmi-transport-y = mailbox.o shmem.o smc.o
 scmi-protocols-y = base.o clock.o perf.o power.o reset.o sensors.o
 obj-$(CONFIG_ARM_SCMI_POWER_DOMAIN) += scmi_pm_domain.o
diff --git a/drivers/firmware/arm_scmi/common.h b/drivers/firmware/arm_scmi/common.h
index 5ac06469b01c..94fc2b2df940 100644
--- a/drivers/firmware/arm_scmi/common.h
+++ b/drivers/firmware/arm_scmi/common.h
@@ -210,6 +210,7 @@ struct scmi_desc {
 };
 
 extern const struct scmi_desc scmi_mailbox_desc;
+extern const struct scmi_desc scmi_smc_desc;
 
 void scmi_rx_callback(struct scmi_chan_info *cinfo, u32 msg_hdr);
 void scmi_free_channel(struct scmi_chan_info *cinfo, struct idr *idr, int id);
diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c
index dbec767222e9..e76a3fab1074 100644
--- a/drivers/firmware/arm_scmi/driver.c
+++ b/drivers/firmware/arm_scmi/driver.c
@@ -827,6 +827,7 @@ ATTRIBUTE_GROUPS(versions);
 /* Each compatible listed below must have descriptor associated with it */
 static const struct of_device_id scmi_of_match[] = {
 	{ .compatible = "arm,scmi", .data = &scmi_mailbox_desc },
+	{ .compatible = "arm,scmi-smc", .data = &scmi_smc_desc},
 	{ /* Sentinel */ },
 };
 
diff --git a/drivers/firmware/arm_scmi/smc.c b/drivers/firmware/arm_scmi/smc.c
new file mode 100644
index 000000000000..336168e40f49
--- /dev/null
+++ b/drivers/firmware/arm_scmi/smc.c
@@ -0,0 +1,152 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * System Control and Management Interface (SCMI) Message SMC/HVC
+ * Transport driver
+ *
+ * Copyright 2020 NXP
+ */
+
+#include <linux/arm-smccc.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/slab.h>
+
+#include "common.h"
+
+/**
+ * struct scmi_smc - Structure representing a SCMI smc transport
+ *
+ * @cinfo: SCMI channel info
+ * @shmem: Transmit/Receive shared memory area
+ * @func_id: smc/hvc call function id
+ */
+
+struct scmi_smc {
+	struct scmi_chan_info *cinfo;
+	struct scmi_shared_mem __iomem *shmem;
+	u32 func_id;
+};
+
+static DEFINE_MUTEX(smc_mutex);
+
+static bool smc_chan_available(struct device *dev, int idx)
+{
+	return true;
+}
+
+static int smc_chan_setup(struct scmi_chan_info *cinfo, struct device *dev,
+			  bool tx)
+{
+	struct device *cdev = cinfo->dev;
+	struct scmi_smc *scmi_info;
+	resource_size_t size;
+	struct resource res;
+	struct device_node *np;
+	u32 func_id;
+	int ret;
+
+	if (!tx)
+		return -ENODEV;
+
+	scmi_info = devm_kzalloc(dev, sizeof(*scmi_info), GFP_KERNEL);
+	if (!scmi_info)
+		return -ENOMEM;
+
+	np = of_parse_phandle(cdev->of_node, "shmem", 0);
+	if (!np)
+		np = of_parse_phandle(dev->of_node, "shmem", 0);
+	ret = of_address_to_resource(np, 0, &res);
+	of_node_put(np);
+	if (ret) {
+		dev_err(cdev, "failed to get SCMI Tx shared memory\n");
+		return ret;
+	}
+
+	size = resource_size(&res);
+	scmi_info->shmem = devm_ioremap(dev, res.start, size);
+	if (!scmi_info->shmem) {
+		dev_err(dev, "failed to ioremap SCMI Tx shared memory\n");
+		return -EADDRNOTAVAIL;
+	}
+
+	ret = of_property_read_u32(dev->of_node, "arm,smc-id", &func_id);
+	if (ret < 0)
+		return ret;
+
+	scmi_info->func_id = func_id;
+	scmi_info->cinfo = cinfo;
+	cinfo->transport_info = scmi_info;
+
+	return 0;
+}
+
+static int smc_chan_free(int id, void *p, void *data)
+{
+	struct scmi_chan_info *cinfo = p;
+	struct scmi_smc *scmi_info = cinfo->transport_info;
+
+	cinfo->transport_info = NULL;
+	scmi_info->cinfo = NULL;
+
+	scmi_free_channel(cinfo, data, id);
+
+	return 0;
+}
+
+static int smc_send_message(struct scmi_chan_info *cinfo,
+			    struct scmi_xfer *xfer)
+{
+	struct scmi_smc *scmi_info = cinfo->transport_info;
+	struct arm_smccc_res res;
+
+	mutex_lock(&smc_mutex);
+
+	shmem_tx_prepare(scmi_info->shmem, xfer);
+
+	arm_smccc_1_1_invoke(scmi_info->func_id, 0, 0, 0, 0, 0, 0, 0, &res);
+	scmi_rx_callback(scmi_info->cinfo, shmem_read_header(scmi_info->shmem));
+
+	mutex_unlock(&smc_mutex);
+
+	return res.a0;
+}
+
+static void smc_mark_txdone(struct scmi_chan_info *cinfo, int ret)
+{
+}
+
+static void smc_fetch_response(struct scmi_chan_info *cinfo,
+			       struct scmi_xfer *xfer)
+{
+	struct scmi_smc *scmi_info = cinfo->transport_info;
+
+	shmem_fetch_response(scmi_info->shmem, xfer);
+}
+
+static bool
+smc_poll_done(struct scmi_chan_info *cinfo, struct scmi_xfer *xfer)
+{
+	struct scmi_smc *scmi_info = cinfo->transport_info;
+
+	return shmem_poll_done(scmi_info->shmem, xfer);
+}
+
+static struct scmi_transport_ops scmi_smc_ops = {
+	.chan_available = smc_chan_available,
+	.chan_setup = smc_chan_setup,
+	.chan_free = smc_chan_free,
+	.send_message = smc_send_message,
+	.mark_txdone = smc_mark_txdone,
+	.fetch_response = smc_fetch_response,
+	.poll_done = smc_poll_done,
+};
+
+const struct scmi_desc scmi_smc_desc = {
+	.ops = &scmi_smc_ops,
+	.max_rx_timeout_ms = 30,
+	.max_msg = 1,
+	.max_msg_size = 128,
+};
-- 
2.16.4