[PATCH v2 1/1] soc: add polarfire soc system controller
conor.dooley at microchip.com
conor.dooley at microchip.com
Mon Dec 20 06:44:13 PST 2021
From: Conor Dooley <conor.dooley at 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 at 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 at 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 at 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
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