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Message-ID: <20251114150738.32426-2-damien.riegel@silabs.com>
Date: Fri, 14 Nov 2025 10:07:27 -0500
From: Damien Riégel <damien.riegel@...abs.com>
To: greybus-dev@...ts.linaro.org, Johan Hovold <johan@...nel.org>,
Alex Elder <elder@...nel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linux-kernel@...r.kernel.org
Cc: Silicon Labs Kernel Team <linux-devel@...abs.com>,
Damien Riégel <damien.riegel@...abs.com>
Subject: [RFC PATCH v2 01/12] greybus: cpc: add minimal CPC Host Device infrastructure
As the first step for adding CPC support with Greybus, add a very
minimal module for CPC Host Devices. For now, this module only proxies
calls to the Greybus Host Device API and does nothing useful, but
further commits will use this base to add features.
Signed-off-by: Damien Riégel <damien.riegel@...abs.com>
---
MAINTAINERS | 6 +++
drivers/greybus/Kconfig | 2 +
drivers/greybus/Makefile | 2 +
drivers/greybus/cpc/Kconfig | 10 +++++
drivers/greybus/cpc/Makefile | 6 +++
drivers/greybus/cpc/host.c | 85 ++++++++++++++++++++++++++++++++++++
drivers/greybus/cpc/host.h | 40 +++++++++++++++++
7 files changed, 151 insertions(+)
create mode 100644 drivers/greybus/cpc/Kconfig
create mode 100644 drivers/greybus/cpc/Makefile
create mode 100644 drivers/greybus/cpc/host.c
create mode 100644 drivers/greybus/cpc/host.h
diff --git a/MAINTAINERS b/MAINTAINERS
index f7af0a5cf1e..992c74b9f6c 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -10029,6 +10029,12 @@ S: Maintained
F: Documentation/devicetree/bindings/net/ti,cc1352p7.yaml
F: drivers/greybus/gb-beagleplay.c
+GREYBUS CPC DRIVERS
+M: Damien Riégel <damien.riegel@...abs.com>
+R: Silicon Labs Kernel Team <linux-devel@...abs.com>
+S: Supported
+F: drivers/greybus/cpc/*
+
GREYBUS SUBSYSTEM
M: Johan Hovold <johan@...nel.org>
M: Alex Elder <elder@...nel.org>
diff --git a/drivers/greybus/Kconfig b/drivers/greybus/Kconfig
index 797f32a9c5e..59dcfc126e5 100644
--- a/drivers/greybus/Kconfig
+++ b/drivers/greybus/Kconfig
@@ -30,6 +30,8 @@ config GREYBUS_BEAGLEPLAY
To compile this code as a module, chose M here: the module
will be called gb-beagleplay.ko
+source "drivers/greybus/cpc/Kconfig"
+
config GREYBUS_ES2
tristate "Greybus ES3 USB host controller"
depends on USB
diff --git a/drivers/greybus/Makefile b/drivers/greybus/Makefile
index 7c179cc60e5..fc77e86bffb 100644
--- a/drivers/greybus/Makefile
+++ b/drivers/greybus/Makefile
@@ -21,6 +21,8 @@ ccflags-y += -I$(src)
# Greybus Host controller drivers
obj-$(CONFIG_GREYBUS_BEAGLEPLAY) += gb-beagleplay.o
+obj-$(CONFIG_GREYBUS_CPC) += cpc/
+
gb-es2-y := es2.o
obj-$(CONFIG_GREYBUS_ES2) += gb-es2.o
diff --git a/drivers/greybus/cpc/Kconfig b/drivers/greybus/cpc/Kconfig
new file mode 100644
index 00000000000..ab96fedd0de
--- /dev/null
+++ b/drivers/greybus/cpc/Kconfig
@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: GPL-2.0
+
+config GREYBUS_CPC
+ tristate "Greybus CPC driver"
+ help
+ Select this option if you have a Silicon Labs device that acts as a
+ Greybus SVC.
+
+ To compile this code as a module, chose M here: the module will be
+ called gb-cpc.ko
diff --git a/drivers/greybus/cpc/Makefile b/drivers/greybus/cpc/Makefile
new file mode 100644
index 00000000000..490982a0ff5
--- /dev/null
+++ b/drivers/greybus/cpc/Makefile
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0
+
+gb-cpc-y := host.o
+
+# CPC core
+obj-$(CONFIG_GREYBUS_CPC) += gb-cpc.o
diff --git a/drivers/greybus/cpc/host.c b/drivers/greybus/cpc/host.c
new file mode 100644
index 00000000000..1eb6c87e25f
--- /dev/null
+++ b/drivers/greybus/cpc/host.c
@@ -0,0 +1,85 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2025, Silicon Laboratories, Inc.
+ */
+
+#include <linux/err.h>
+#include <linux/greybus.h>
+#include <linux/module.h>
+
+#include "host.h"
+
+
+static struct cpc_host_device *gb_hd_to_cpc_hd(struct gb_host_device *hd)
+{
+ return (struct cpc_host_device *)&hd->hd_priv;
+}
+
+static int cpc_gb_message_send(struct gb_host_device *gb_hd, u16 cport_id,
+ struct gb_message *message, gfp_t gfp_mask)
+{
+ struct cpc_host_device *cpc_hd = gb_hd_to_cpc_hd(gb_hd);
+
+ return cpc_hd->driver->message_send(cpc_hd, cport_id, message, gfp_mask);
+}
+
+static void cpc_gb_message_cancel(struct gb_message *message)
+{
+ /* Not implemented */
+}
+
+static struct gb_hd_driver cpc_gb_driver = {
+ .hd_priv_size = sizeof(struct cpc_host_device),
+ .message_send = cpc_gb_message_send,
+ .message_cancel = cpc_gb_message_cancel,
+};
+
+struct cpc_host_device *cpc_hd_create(struct cpc_hd_driver *driver, struct device *parent)
+{
+ struct cpc_host_device *cpc_hd;
+ struct gb_host_device *hd;
+
+ if ((!driver->message_send) || (!driver->message_cancel)) {
+ dev_err(parent, "missing mandatory callbacks\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ hd = gb_hd_create(&cpc_gb_driver, parent, GB_CPC_MSG_SIZE_MAX, GB_CPC_NUM_CPORTS);
+ if (IS_ERR(hd))
+ return (struct cpc_host_device *)hd;
+
+ cpc_hd = gb_hd_to_cpc_hd(hd);
+ cpc_hd->gb_hd = hd;
+ cpc_hd->driver = driver;
+
+ return cpc_hd;
+}
+EXPORT_SYMBOL_GPL(cpc_hd_create);
+
+int cpc_hd_add(struct cpc_host_device *cpc_hd)
+{
+ return gb_hd_add(cpc_hd->gb_hd);
+}
+EXPORT_SYMBOL_GPL(cpc_hd_add);
+
+void cpc_hd_put(struct cpc_host_device *cpc_hd)
+{
+ return gb_hd_put(cpc_hd->gb_hd);
+}
+EXPORT_SYMBOL_GPL(cpc_hd_put);
+
+void cpc_hd_del(struct cpc_host_device *cpc_hd)
+{
+ return gb_hd_del(cpc_hd->gb_hd);
+}
+EXPORT_SYMBOL_GPL(cpc_hd_del);
+
+void cpc_hd_rcvd(struct cpc_host_device *cpc_hd, u16 cport_id, u8 *data, size_t length)
+{
+ greybus_data_rcvd(cpc_hd->gb_hd, cport_id, data, length);
+}
+EXPORT_SYMBOL_GPL(cpc_hd_rcvd);
+
+MODULE_DESCRIPTION("Greybus over CPC");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Silicon Laboratories, Inc.");
diff --git a/drivers/greybus/cpc/host.h b/drivers/greybus/cpc/host.h
new file mode 100644
index 00000000000..fe07826b765
--- /dev/null
+++ b/drivers/greybus/cpc/host.h
@@ -0,0 +1,40 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2025, Silicon Laboratories, Inc.
+ */
+
+#ifndef __CPC_HOST_H
+#define __CPC_HOST_H
+
+#include <linux/device.h>
+#include <linux/greybus.h>
+#include <linux/types.h>
+
+#define GB_CPC_MSG_SIZE_MAX 2048
+#define GB_CPC_NUM_CPORTS 8
+
+struct cpc_host_device;
+
+struct cpc_hd_driver {
+ int (*message_send)(struct cpc_host_device *hd, u16 dest_cport_id,
+ struct gb_message *message, gfp_t gfp_mask);
+ void (*message_cancel)(struct gb_message *message);
+};
+
+/**
+ * struct cpc_host_device - CPC host device.
+ * @gb_hd: pointer to Greybus Host Device this device belongs to.
+ * @driver: driver operations.
+ */
+struct cpc_host_device {
+ struct gb_host_device *gb_hd;
+ const struct cpc_hd_driver *driver;
+};
+
+struct cpc_host_device *cpc_hd_create(struct cpc_hd_driver *driver, struct device *parent);
+int cpc_hd_add(struct cpc_host_device *cpc_hd);
+void cpc_hd_put(struct cpc_host_device *cpc_hd);
+void cpc_hd_del(struct cpc_host_device *cpc_hd);
+void cpc_hd_rcvd(struct cpc_host_device *cpc_hd, u16 cport_id, u8 *data, size_t length);
+
+#endif
--
2.49.0
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