| From a834f4e143ff647e7677dc60ab57ee5883f3ac8f Mon Sep 17 00:00:00 2001 |
| From: Emekcan <emekcan.aras@arm.com> |
| Date: Wed, 17 Aug 2022 14:21:42 +0100 |
| Subject: [PATCH] Add rpmsg driver for corstone1000 |
| |
| Adds rpmsg driver to communicate with external |
| system in corstone1000 platform. |
| |
| Upstream-Status: Pending |
| Signed-off-by: Emekcan Aras <emekcan.aras@arm.com> |
| Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org> |
| --- |
| drivers/rpmsg/Kconfig | 10 ++ |
| drivers/rpmsg/Makefile | 1 + |
| drivers/rpmsg/rpmsg_arm_mailbox.c | 164 ++++++++++++++++++++++++++++++ |
| 3 files changed, 175 insertions(+) |
| create mode 100644 drivers/rpmsg/rpmsg_arm_mailbox.c |
| |
| diff --git a/drivers/rpmsg/Kconfig b/drivers/rpmsg/Kconfig |
| index d3795860f5c0..fc6916d7b523 100644 |
| --- a/drivers/rpmsg/Kconfig |
| +++ b/drivers/rpmsg/Kconfig |
| @@ -81,4 +81,14 @@ config RPMSG_VIRTIO |
| select RPMSG_NS |
| select VIRTIO |
| |
| +config RPMSG_ARM |
| + tristate "ARM RPMSG driver" |
| + select RPMSG |
| + depends on HAS_IOMEM |
| + depends on MAILBOX |
| + help |
| + Say y here to enable support for rpmsg lient driver which is built |
| + around mailbox client using Arm MHUv2.1 as physical medium.This |
| + driver enables communication which remote processor using MHU. |
| + |
| endmenu |
| diff --git a/drivers/rpmsg/Makefile b/drivers/rpmsg/Makefile |
| index 58e3b382e316..6bdcc69688b2 100644 |
| --- a/drivers/rpmsg/Makefile |
| +++ b/drivers/rpmsg/Makefile |
| @@ -1,5 +1,6 @@ |
| # SPDX-License-Identifier: GPL-2.0 |
| obj-$(CONFIG_RPMSG) += rpmsg_core.o |
| +obj-$(CONFIG_RPMSG_ARM) += rpmsg_arm_mailbox.o |
| obj-$(CONFIG_RPMSG_CHAR) += rpmsg_char.o |
| obj-$(CONFIG_RPMSG_CTRL) += rpmsg_ctrl.o |
| obj-$(CONFIG_RPMSG_NS) += rpmsg_ns.o |
| diff --git a/drivers/rpmsg/rpmsg_arm_mailbox.c b/drivers/rpmsg/rpmsg_arm_mailbox.c |
| new file mode 100644 |
| index 000000000000..4a80102669f6 |
| --- /dev/null |
| +++ b/drivers/rpmsg/rpmsg_arm_mailbox.c |
| @@ -0,0 +1,164 @@ |
| +// SPDX-License-Identifier: GPL-2.0 |
| +/* |
| + * rpmsg client driver using mailbox client interface |
| + * |
| + * Copyright (C) 2019 ARM Ltd. |
| + * |
| + */ |
| + |
| +#include <linux/bitmap.h> |
| +#include <linux/export.h> |
| +#include <linux/io.h> |
| +#include <linux/kernel.h> |
| +#include <linux/ktime.h> |
| +#include <linux/mailbox_client.h> |
| +#include <linux/module.h> |
| +#include <linux/of_address.h> |
| +#include <linux/of_device.h> |
| +#include <linux/processor.h> |
| +#include <linux/semaphore.h> |
| +#include <linux/slab.h> |
| +#include <linux/rpmsg.h> |
| +#include "rpmsg_internal.h" |
| +#include <linux/mailbox/arm_mhuv2_message.h> |
| + |
| +#define RPMSG_NAME "arm_rpmsg" |
| +#define RPMSG_ADDR_ANY 0xFFFFFFFF |
| + |
| +struct arm_channel { |
| + struct rpmsg_endpoint ept; |
| + struct mbox_client cl; |
| + struct mbox_chan *mbox; |
| +}; |
| + |
| +#define arm_channel_from_rpmsg(_ept) container_of(_ept, struct arm_channel, ept) |
| +#define arm_channel_from_mbox(_ept) container_of(_ept, struct arm_channel, cl) |
| + |
| + |
| +static void arm_msg_rx_handler(struct mbox_client *cl, void *mssg) |
| +{ |
| + struct arm_mhuv2_mbox_msg *msg = mssg; |
| + struct arm_channel* channel = arm_channel_from_mbox(cl); |
| + int err = channel->ept.cb(channel->ept.rpdev, msg->data, 4, channel->ept.priv, RPMSG_ADDR_ANY); |
| + if(err) { |
| + printk("ARM Mailbox: Endpoint callback failed with error: %d", err); |
| + } |
| +} |
| + |
| + |
| +static void arm_destroy_ept(struct rpmsg_endpoint *ept) |
| +{ |
| + struct arm_channel *channel = arm_channel_from_rpmsg(ept); |
| + mbox_free_channel(channel->mbox); |
| + kfree(channel); |
| +} |
| + |
| +static int arm_send(struct rpmsg_endpoint *ept, void *data, int len) |
| +{ |
| + struct arm_channel *channel = arm_channel_from_rpmsg(ept); |
| + |
| + mbox_send_message(channel->mbox, data); |
| + return 0; |
| +} |
| + |
| +static int arm_sendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dest) |
| +{ |
| + struct arm_mhuv2_mbox_msg msg; |
| + struct arm_channel *channel = arm_channel_from_rpmsg(ept); |
| + msg.data = data; |
| + msg.len = len; |
| + mbox_send_message(channel->mbox, &msg); |
| + return 0; |
| +} |
| + |
| + |
| +static const struct rpmsg_endpoint_ops arm_endpoint_ops = { |
| + .destroy_ept = arm_destroy_ept, |
| + .send = arm_send, |
| + .sendto = arm_sendto, |
| +}; |
| + |
| + |
| +static struct rpmsg_endpoint *arm_create_ept(struct rpmsg_device *rpdev, |
| + rpmsg_rx_cb_t cb, void *priv, struct rpmsg_channel_info chinfo) |
| +{ |
| + struct arm_channel *channel; |
| + |
| + channel = kzalloc(sizeof(*channel), GFP_KERNEL); |
| + |
| + // Initialize rpmsg endpoint |
| + kref_init(&channel->ept.refcount); |
| + channel->ept.rpdev = rpdev; |
| + channel->ept.cb = cb; |
| + channel->ept.priv = priv; |
| + channel->ept.ops = &arm_endpoint_ops; |
| + |
| + // Initialize mailbox client |
| + channel->cl.dev = rpdev->dev.parent; |
| + channel->cl.rx_callback = arm_msg_rx_handler; |
| + channel->cl.tx_done = NULL; /* operate in blocking mode */ |
| + channel->cl.tx_block = true; |
| + channel->cl.tx_tout = 500; /* by half a second */ |
| + channel->cl.knows_txdone = false; /* depending upon protocol */ |
| + |
| + channel->mbox = mbox_request_channel_byname(&channel->cl, chinfo.name); |
| + if (IS_ERR_OR_NULL(channel->mbox)) { |
| + printk("RPMsg ARM: Cannot get channel by name: '%s'\n", chinfo.name); |
| + return -1; |
| + } |
| + |
| + return &channel->ept; |
| +} |
| + |
| +static const struct rpmsg_device_ops arm_device_ops = { |
| + .create_ept = arm_create_ept, |
| +}; |
| + |
| + |
| +static void arm_release_device(struct device *dev) |
| +{ |
| + struct rpmsg_device *rpdev = to_rpmsg_device(dev); |
| + |
| + kfree(rpdev); |
| +} |
| + |
| + |
| +static int client_probe(struct platform_device *pdev) |
| +{ |
| + struct device *dev = &pdev->dev; |
| + struct rpmsg_device *rpdev; |
| + |
| + rpdev = kzalloc(sizeof(*rpdev), GFP_KERNEL); |
| + if (!rpdev) |
| + return -ENOMEM; |
| + |
| + /* Assign callbacks for rpmsg_device */ |
| + rpdev->ops = &arm_device_ops; |
| + |
| + /* Assign public information to the rpmsg_device */ |
| + memcpy(rpdev->id.name, RPMSG_NAME, strlen(RPMSG_NAME)); |
| + |
| + rpdev->dev.parent = dev; |
| + rpdev->dev.release = arm_release_device; |
| + |
| + return rpmsg_chrdev_register_device(rpdev); |
| +} |
| + |
| +static const struct of_device_id client_of_match[] = { |
| + { .compatible = "arm,client", .data = NULL }, |
| + { /* Sentinel */ }, |
| +}; |
| + |
| +static struct platform_driver client_driver = { |
| + .driver = { |
| + .name = "arm-mhu-client", |
| + .of_match_table = client_of_match, |
| + }, |
| + .probe = client_probe, |
| +}; |
| + |
| +module_platform_driver(client_driver); |
| + |
| +MODULE_LICENSE("GPL v2"); |
| +MODULE_DESCRIPTION("ARM RPMSG Driver"); |
| +MODULE_AUTHOR("Tushar Khandelwal <tushar.khandelwal@arm.com>"); |