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From:   <conor.dooley@microchip.com>
To:     <aou@eecs.berkeley.edu>, <paul.walmsley@sifive.com>,
        <palmer@dabbelt.com>, <arnd@arndb.de>, <olof@lixom.net>,
        <linux-riscv@lists.infradead.org>
CC:     <cyril.jean@microchip.com>, <daire.mcnamara@microchip.com>,
        <lewis.hanly@microchip.com>, <jassisinghbrar@gmail.com>,
        <j.neuschaefer@gmx.net>, <sfr@canb.auug.org.au>,
        <damien.lemoal@wdc.com>, <atishp@atishpatra.org>,
        <nicolas.ferre@microchip.com>, <alexandre.belloni@bootlin.com>,
        <ludovic.desroches@microchip.com>, <claudiu.beznea@microchip.com>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-kernel@vger.kernel.org>,
        Conor Dooley <conor.dooley@microchip.com>
Subject: [PATCH v2 1/1] soc: add polarfire soc system controller
Date:   Mon, 20 Dec 2021 14:44:13 +0000
Message-ID: <20211220144413.6798-2-conor.dooley@microchip.com>
In-Reply-To: <20211220144413.6798-1-conor.dooley@microchip.com>
References: <20211220144413.6798-1-conor.dooley@microchip.com>
MIME-Version: 1.0
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From: Conor Dooley <conor.dooley@microchip.com>

This driver provides an interface for other drivers to access the
functions of the system controller on the Microchip PolarFire SoC.

Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
---
 drivers/soc/Kconfig                         |   1 +
 drivers/soc/Makefile                        |   1 +
 drivers/soc/microchip/Kconfig               |  10 ++
 drivers/soc/microchip/Makefile              |   1 +
 drivers/soc/microchip/mpfs-sys-controller.c | 169 ++++++++++++++++++++
 include/soc/microchip/mpfs.h                |   3 +-
 6 files changed, 184 insertions(+), 1 deletion(-)
 create mode 100644 drivers/soc/microchip/Kconfig
 create mode 100644 drivers/soc/microchip/Makefile
 create mode 100644 drivers/soc/microchip/mpfs-sys-controller.c

diff --git a/drivers/soc/Kconfig b/drivers/soc/Kconfig
index e8a30c4c5aec..b33142e020e0 100644
--- a/drivers/soc/Kconfig
+++ b/drivers/soc/Kconfig
@@ -12,6 +12,7 @@ source "drivers/soc/imx/Kconfig"
 source "drivers/soc/ixp4xx/Kconfig"
 source "drivers/soc/litex/Kconfig"
 source "drivers/soc/mediatek/Kconfig"
+source "drivers/soc/microchip/Kconfig"
 source "drivers/soc/qcom/Kconfig"
 source "drivers/soc/renesas/Kconfig"
 source "drivers/soc/rockchip/Kconfig"
diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile
index a05e9fbcd3e0..e3be151e391e 100644
--- a/drivers/soc/Makefile
+++ b/drivers/soc/Makefile
@@ -17,6 +17,7 @@ obj-y				+= ixp4xx/
 obj-$(CONFIG_SOC_XWAY)		+= lantiq/
 obj-$(CONFIG_LITEX_SOC_CONTROLLER) += litex/
 obj-y				+= mediatek/
+obj-y				+= microchip/
 obj-y				+= amlogic/
 obj-y				+= qcom/
 obj-y				+= renesas/
diff --git a/drivers/soc/microchip/Kconfig b/drivers/soc/microchip/Kconfig
new file mode 100644
index 000000000000..eb656b33156b
--- /dev/null
+++ b/drivers/soc/microchip/Kconfig
@@ -0,0 +1,10 @@
+config POLARFIRE_SOC_SYS_CTRL
+	tristate "POLARFIRE_SOC_SYS_CTRL"
+	depends on POLARFIRE_SOC_MAILBOX
+	help
+	  This driver adds support for the PolarFire SoC (MPFS) system controller.
+
+	  To compile this driver as a module, choose M here. the
+	  module will be called mpfs_system_controller.
+
+	  If unsure, say N.
diff --git a/drivers/soc/microchip/Makefile b/drivers/soc/microchip/Makefile
new file mode 100644
index 000000000000..14489919fe4b
--- /dev/null
+++ b/drivers/soc/microchip/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_POLARFIRE_SOC_SYS_CTRL)	+= mpfs-sys-controller.o
diff --git a/drivers/soc/microchip/mpfs-sys-controller.c b/drivers/soc/microchip/mpfs-sys-controller.c
new file mode 100644
index 000000000000..af3b05d8b41e
--- /dev/null
+++ b/drivers/soc/microchip/mpfs-sys-controller.c
@@ -0,0 +1,169 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Microchip PolarFire SoC (MPFS) system controller driver
+ *
+ * Copyright (c) 2020-2021 Microchip Corporation. All rights reserved.
+ *
+ * Author: Conor Dooley <conor.dooley@microchip.com>
+ *
+ */
+
+#include <linux/slab.h>
+#include <linux/kref.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/of_platform.h>
+#include <linux/mailbox_client.h>
+#include <linux/platform_device.h>
+#include <soc/microchip/mpfs.h>
+
+static DEFINE_MUTEX(transaction_lock);
+
+struct mpfs_sys_controller {
+	struct mbox_client client;
+	struct mbox_chan *chan;
+	struct completion c;
+	struct kref consumers;
+};
+
+int mpfs_blocking_transaction(struct mpfs_sys_controller *sys_controller, void *msg)
+{
+	int ret, err;
+
+	err = mutex_lock_interruptible(&transaction_lock);
+	if (err)
+		return err;
+
+	reinit_completion(&sys_controller->c);
+
+	ret = mbox_send_message(sys_controller->chan, msg);
+	if (ret >= 0) {
+		if (wait_for_completion_timeout(&sys_controller->c, HZ)) {
+			ret = 0;
+		} else {
+			ret = -ETIMEDOUT;
+			dev_warn(sys_controller->client.dev,
+				 "MPFS sys controller transaction timeout\n");
+		}
+	} else {
+		dev_err(sys_controller->client.dev,
+			"mpfs sys controller transaction returned %d\n", ret);
+	}
+
+	mutex_unlock(&transaction_lock);
+
+	return ret;
+}
+EXPORT_SYMBOL(mpfs_blocking_transaction);
+
+static void rx_callback(struct mbox_client *client, void *msg)
+{
+	struct mpfs_sys_controller *sys_controller =
+		container_of(client, struct mpfs_sys_controller, client);
+
+	complete(&sys_controller->c);
+}
+
+static void mpfs_sys_controller_delete(struct kref *kref)
+{
+	struct mpfs_sys_controller *sys_controller = container_of(kref, struct mpfs_sys_controller,
+					       consumers);
+
+	mbox_free_channel(sys_controller->chan);
+	kfree(sys_controller);
+}
+
+void mpfs_sys_controller_put(void *data)
+{
+	struct mpfs_sys_controller *sys_controller = data;
+
+	kref_put(&sys_controller->consumers, mpfs_sys_controller_delete);
+}
+EXPORT_SYMBOL_GPL(mpfs_sys_controller_put);
+
+static int mpfs_sys_controller_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct mpfs_sys_controller *sys_controller;
+
+	sys_controller = kzalloc(sizeof(*sys_controller), GFP_KERNEL);
+	if (!sys_controller)
+		return -ENOMEM;
+
+	sys_controller->client.dev = dev;
+	sys_controller->client.rx_callback = rx_callback;
+	sys_controller->client.tx_block = 1U;
+
+	sys_controller->chan = mbox_request_channel(&sys_controller->client, 0);
+	if (IS_ERR(sys_controller->chan))
+		return dev_err_probe(dev, PTR_ERR(sys_controller->chan),
+				     "Failed to get mbox channel\n");
+
+	init_completion(&sys_controller->c);
+	kref_init(&sys_controller->consumers);
+
+	platform_set_drvdata(pdev, sys_controller);
+
+	dev_info(&pdev->dev, "Registered MPFS system controller driver\n");
+
+	return 0;
+}
+
+static int mpfs_sys_controller_remove(struct platform_device *pdev)
+{
+	struct mpfs_sys_controller *sys_controller = platform_get_drvdata(pdev);
+
+	mpfs_sys_controller_put(sys_controller);
+
+	return 0;
+}
+
+struct mpfs_sys_controller *mpfs_sys_controller_get(struct device *dev,
+						    struct device_node *sys_ctrl_node)
+{
+	struct mpfs_sys_controller *sys_controller;
+	struct platform_device *pdev;
+
+	pdev = of_find_device_by_node(sys_ctrl_node);
+	if (!pdev)
+		return NULL;
+
+	sys_controller = platform_get_drvdata(pdev);
+	if (!sys_controller)
+		goto err_put_device;
+
+	if (!kref_get_unless_zero(&sys_controller->consumers))
+		goto err_put_device;
+
+	put_device(&pdev->dev);
+
+	if (devm_add_action_or_reset(dev, mpfs_sys_controller_put, sys_controller))
+		return NULL;
+
+	return sys_controller;
+
+err_put_device:
+	put_device(&pdev->dev);
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(mpfs_sys_controller_get);
+
+static const struct of_device_id mpfs_sys_controller_of_match[] = {
+	{.compatible = "microchip,mpfs-sys-controller", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, mpfs_sys_controller_of_match);
+
+static struct platform_driver mpfs_sys_controller_driver = {
+	.driver = {
+		.name = "mpfs-sys-controller",
+		.of_match_table = mpfs_sys_controller_of_match,
+	},
+	.probe = mpfs_sys_controller_probe,
+	.remove = mpfs_sys_controller_remove,
+};
+module_platform_driver(mpfs_sys_controller_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Conor Dooley <conor.dooley@microchip.com>");
+MODULE_DESCRIPTION("MPFS system controller driver");
diff --git a/include/soc/microchip/mpfs.h b/include/soc/microchip/mpfs.h
index 2b64c95f3be5..0a594dfa8094 100644
--- a/include/soc/microchip/mpfs.h
+++ b/include/soc/microchip/mpfs.h
@@ -36,7 +36,8 @@ struct mpfs_mss_response {
 
 int mpfs_blocking_transaction(struct mpfs_sys_controller *mpfs_client, void *msg);
 
-struct mpfs_sys_controller *mpfs_sys_controller_get(struct device_node *mailbox_node);
+struct mpfs_sys_controller *mpfs_sys_controller_get(struct device *dev,
+						    struct device_node *sys_ctrl_node);
 
 #endif /* if IS_ENABLED(CONFIG_POLARFIRE_SOC_SYS_CTRL) */
 
-- 
2.33.1