Patrick Williams | 864cc43 | 2023-02-09 14:54:44 -0600 | [diff] [blame^] | 1 | From 9fb971c23d423f593620ed82fb69a7e2cd35986a Mon Sep 17 00:00:00 2001 |
Patrick Williams | 8dd6848 | 2022-10-04 07:57:18 -0500 | [diff] [blame] | 2 | From: Emekcan <emekcan.aras@arm.com> |
| 3 | Date: Wed, 17 Aug 2022 14:21:42 +0100 |
Patrick Williams | 864cc43 | 2023-02-09 14:54:44 -0600 | [diff] [blame^] | 4 | Subject: [PATCH 3/6] Add rpmsg driver for corstone1000 |
Patrick Williams | 8dd6848 | 2022-10-04 07:57:18 -0500 | [diff] [blame] | 5 | |
Patrick Williams | 2194f50 | 2022-10-16 14:26:09 -0500 | [diff] [blame] | 6 | Adds rpmsg driver to communicate with external |
Patrick Williams | 8dd6848 | 2022-10-04 07:57:18 -0500 | [diff] [blame] | 7 | system in corstone1000 platform. |
| 8 | |
Patrick Williams | 864cc43 | 2023-02-09 14:54:44 -0600 | [diff] [blame^] | 9 | Upstream-Status: Pending |
Patrick Williams | 8dd6848 | 2022-10-04 07:57:18 -0500 | [diff] [blame] | 10 | Signed-off-by: Emekcan Aras <emekcan.aras@arm.com> |
Patrick Williams | 864cc43 | 2023-02-09 14:54:44 -0600 | [diff] [blame^] | 11 | Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org> |
Patrick Williams | 8dd6848 | 2022-10-04 07:57:18 -0500 | [diff] [blame] | 12 | --- |
| 13 | drivers/rpmsg/Kconfig | 10 ++ |
| 14 | drivers/rpmsg/Makefile | 1 + |
Patrick Williams | 864cc43 | 2023-02-09 14:54:44 -0600 | [diff] [blame^] | 15 | drivers/rpmsg/rpmsg_arm_mailbox.c | 164 ++++++++++++++++++++++++++++++ |
Patrick Williams | 8dd6848 | 2022-10-04 07:57:18 -0500 | [diff] [blame] | 16 | 3 files changed, 175 insertions(+) |
| 17 | create mode 100644 drivers/rpmsg/rpmsg_arm_mailbox.c |
| 18 | |
| 19 | diff --git a/drivers/rpmsg/Kconfig b/drivers/rpmsg/Kconfig |
Patrick Williams | 864cc43 | 2023-02-09 14:54:44 -0600 | [diff] [blame^] | 20 | index d3795860f5c0..fc6916d7b523 100644 |
Patrick Williams | 8dd6848 | 2022-10-04 07:57:18 -0500 | [diff] [blame] | 21 | --- a/drivers/rpmsg/Kconfig |
| 22 | +++ b/drivers/rpmsg/Kconfig |
Patrick Williams | 864cc43 | 2023-02-09 14:54:44 -0600 | [diff] [blame^] | 23 | @@ -81,4 +81,14 @@ config RPMSG_VIRTIO |
Patrick Williams | 8dd6848 | 2022-10-04 07:57:18 -0500 | [diff] [blame] | 24 | select RPMSG_NS |
| 25 | select VIRTIO |
| 26 | |
| 27 | +config RPMSG_ARM |
| 28 | + tristate "ARM RPMSG driver" |
| 29 | + select RPMSG |
| 30 | + depends on HAS_IOMEM |
| 31 | + depends on MAILBOX |
| 32 | + help |
| 33 | + Say y here to enable support for rpmsg lient driver which is built |
| 34 | + around mailbox client using Arm MHUv2.1 as physical medium.This |
| 35 | + driver enables communication which remote processor using MHU. |
| 36 | + |
| 37 | endmenu |
| 38 | diff --git a/drivers/rpmsg/Makefile b/drivers/rpmsg/Makefile |
Patrick Williams | 864cc43 | 2023-02-09 14:54:44 -0600 | [diff] [blame^] | 39 | index 58e3b382e316..6bdcc69688b2 100644 |
Patrick Williams | 8dd6848 | 2022-10-04 07:57:18 -0500 | [diff] [blame] | 40 | --- a/drivers/rpmsg/Makefile |
| 41 | +++ b/drivers/rpmsg/Makefile |
| 42 | @@ -1,5 +1,6 @@ |
| 43 | # SPDX-License-Identifier: GPL-2.0 |
| 44 | obj-$(CONFIG_RPMSG) += rpmsg_core.o |
| 45 | +obj-$(CONFIG_RPMSG_ARM) += rpmsg_arm_mailbox.o |
| 46 | obj-$(CONFIG_RPMSG_CHAR) += rpmsg_char.o |
Patrick Williams | 864cc43 | 2023-02-09 14:54:44 -0600 | [diff] [blame^] | 47 | obj-$(CONFIG_RPMSG_CTRL) += rpmsg_ctrl.o |
Patrick Williams | 8dd6848 | 2022-10-04 07:57:18 -0500 | [diff] [blame] | 48 | obj-$(CONFIG_RPMSG_NS) += rpmsg_ns.o |
Patrick Williams | 8dd6848 | 2022-10-04 07:57:18 -0500 | [diff] [blame] | 49 | diff --git a/drivers/rpmsg/rpmsg_arm_mailbox.c b/drivers/rpmsg/rpmsg_arm_mailbox.c |
| 50 | new file mode 100644 |
| 51 | index 000000000000..4a80102669f6 |
| 52 | --- /dev/null |
| 53 | +++ b/drivers/rpmsg/rpmsg_arm_mailbox.c |
| 54 | @@ -0,0 +1,164 @@ |
| 55 | +// SPDX-License-Identifier: GPL-2.0 |
| 56 | +/* |
| 57 | + * rpmsg client driver using mailbox client interface |
| 58 | + * |
| 59 | + * Copyright (C) 2019 ARM Ltd. |
| 60 | + * |
| 61 | + */ |
| 62 | + |
| 63 | +#include <linux/bitmap.h> |
| 64 | +#include <linux/export.h> |
| 65 | +#include <linux/io.h> |
| 66 | +#include <linux/kernel.h> |
| 67 | +#include <linux/ktime.h> |
| 68 | +#include <linux/mailbox_client.h> |
| 69 | +#include <linux/module.h> |
| 70 | +#include <linux/of_address.h> |
| 71 | +#include <linux/of_device.h> |
| 72 | +#include <linux/processor.h> |
| 73 | +#include <linux/semaphore.h> |
| 74 | +#include <linux/slab.h> |
| 75 | +#include <linux/rpmsg.h> |
| 76 | +#include "rpmsg_internal.h" |
| 77 | +#include <linux/mailbox/arm_mhuv2_message.h> |
| 78 | + |
| 79 | +#define RPMSG_NAME "arm_rpmsg" |
| 80 | +#define RPMSG_ADDR_ANY 0xFFFFFFFF |
| 81 | + |
| 82 | +struct arm_channel { |
| 83 | + struct rpmsg_endpoint ept; |
| 84 | + struct mbox_client cl; |
| 85 | + struct mbox_chan *mbox; |
| 86 | +}; |
| 87 | + |
| 88 | +#define arm_channel_from_rpmsg(_ept) container_of(_ept, struct arm_channel, ept) |
| 89 | +#define arm_channel_from_mbox(_ept) container_of(_ept, struct arm_channel, cl) |
| 90 | + |
| 91 | + |
| 92 | +static void arm_msg_rx_handler(struct mbox_client *cl, void *mssg) |
| 93 | +{ |
| 94 | + struct arm_mhuv2_mbox_msg *msg = mssg; |
| 95 | + struct arm_channel* channel = arm_channel_from_mbox(cl); |
| 96 | + int err = channel->ept.cb(channel->ept.rpdev, msg->data, 4, channel->ept.priv, RPMSG_ADDR_ANY); |
| 97 | + if(err) { |
| 98 | + printk("ARM Mailbox: Endpoint callback failed with error: %d", err); |
| 99 | + } |
| 100 | +} |
| 101 | + |
| 102 | + |
| 103 | +static void arm_destroy_ept(struct rpmsg_endpoint *ept) |
| 104 | +{ |
| 105 | + struct arm_channel *channel = arm_channel_from_rpmsg(ept); |
| 106 | + mbox_free_channel(channel->mbox); |
| 107 | + kfree(channel); |
| 108 | +} |
| 109 | + |
| 110 | +static int arm_send(struct rpmsg_endpoint *ept, void *data, int len) |
| 111 | +{ |
| 112 | + struct arm_channel *channel = arm_channel_from_rpmsg(ept); |
| 113 | + |
| 114 | + mbox_send_message(channel->mbox, data); |
| 115 | + return 0; |
| 116 | +} |
| 117 | + |
| 118 | +static int arm_sendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dest) |
| 119 | +{ |
| 120 | + struct arm_mhuv2_mbox_msg msg; |
| 121 | + struct arm_channel *channel = arm_channel_from_rpmsg(ept); |
| 122 | + msg.data = data; |
| 123 | + msg.len = len; |
| 124 | + mbox_send_message(channel->mbox, &msg); |
| 125 | + return 0; |
| 126 | +} |
| 127 | + |
| 128 | + |
| 129 | +static const struct rpmsg_endpoint_ops arm_endpoint_ops = { |
| 130 | + .destroy_ept = arm_destroy_ept, |
| 131 | + .send = arm_send, |
| 132 | + .sendto = arm_sendto, |
| 133 | +}; |
| 134 | + |
| 135 | + |
| 136 | +static struct rpmsg_endpoint *arm_create_ept(struct rpmsg_device *rpdev, |
| 137 | + rpmsg_rx_cb_t cb, void *priv, struct rpmsg_channel_info chinfo) |
| 138 | +{ |
| 139 | + struct arm_channel *channel; |
| 140 | + |
| 141 | + channel = kzalloc(sizeof(*channel), GFP_KERNEL); |
| 142 | + |
| 143 | + // Initialize rpmsg endpoint |
| 144 | + kref_init(&channel->ept.refcount); |
| 145 | + channel->ept.rpdev = rpdev; |
| 146 | + channel->ept.cb = cb; |
| 147 | + channel->ept.priv = priv; |
| 148 | + channel->ept.ops = &arm_endpoint_ops; |
| 149 | + |
| 150 | + // Initialize mailbox client |
| 151 | + channel->cl.dev = rpdev->dev.parent; |
| 152 | + channel->cl.rx_callback = arm_msg_rx_handler; |
| 153 | + channel->cl.tx_done = NULL; /* operate in blocking mode */ |
| 154 | + channel->cl.tx_block = true; |
| 155 | + channel->cl.tx_tout = 500; /* by half a second */ |
| 156 | + channel->cl.knows_txdone = false; /* depending upon protocol */ |
| 157 | + |
| 158 | + channel->mbox = mbox_request_channel_byname(&channel->cl, chinfo.name); |
| 159 | + if (IS_ERR_OR_NULL(channel->mbox)) { |
| 160 | + printk("RPMsg ARM: Cannot get channel by name: '%s'\n", chinfo.name); |
| 161 | + return -1; |
| 162 | + } |
| 163 | + |
| 164 | + return &channel->ept; |
| 165 | +} |
| 166 | + |
| 167 | +static const struct rpmsg_device_ops arm_device_ops = { |
| 168 | + .create_ept = arm_create_ept, |
| 169 | +}; |
| 170 | + |
| 171 | + |
| 172 | +static void arm_release_device(struct device *dev) |
| 173 | +{ |
| 174 | + struct rpmsg_device *rpdev = to_rpmsg_device(dev); |
| 175 | + |
| 176 | + kfree(rpdev); |
| 177 | +} |
| 178 | + |
| 179 | + |
| 180 | +static int client_probe(struct platform_device *pdev) |
| 181 | +{ |
| 182 | + struct device *dev = &pdev->dev; |
| 183 | + struct rpmsg_device *rpdev; |
| 184 | + |
| 185 | + rpdev = kzalloc(sizeof(*rpdev), GFP_KERNEL); |
| 186 | + if (!rpdev) |
| 187 | + return -ENOMEM; |
| 188 | + |
| 189 | + /* Assign callbacks for rpmsg_device */ |
| 190 | + rpdev->ops = &arm_device_ops; |
| 191 | + |
| 192 | + /* Assign public information to the rpmsg_device */ |
| 193 | + memcpy(rpdev->id.name, RPMSG_NAME, strlen(RPMSG_NAME)); |
| 194 | + |
| 195 | + rpdev->dev.parent = dev; |
| 196 | + rpdev->dev.release = arm_release_device; |
| 197 | + |
| 198 | + return rpmsg_chrdev_register_device(rpdev); |
| 199 | +} |
| 200 | + |
| 201 | +static const struct of_device_id client_of_match[] = { |
| 202 | + { .compatible = "arm,client", .data = NULL }, |
| 203 | + { /* Sentinel */ }, |
| 204 | +}; |
| 205 | + |
| 206 | +static struct platform_driver client_driver = { |
| 207 | + .driver = { |
| 208 | + .name = "arm-mhu-client", |
| 209 | + .of_match_table = client_of_match, |
| 210 | + }, |
| 211 | + .probe = client_probe, |
| 212 | +}; |
| 213 | + |
| 214 | +module_platform_driver(client_driver); |
| 215 | + |
| 216 | +MODULE_LICENSE("GPL v2"); |
| 217 | +MODULE_DESCRIPTION("ARM RPMSG Driver"); |
| 218 | +MODULE_AUTHOR("Tushar Khandelwal <tushar.khandelwal@arm.com>"); |
| 219 | -- |
Patrick Williams | 864cc43 | 2023-02-09 14:54:44 -0600 | [diff] [blame^] | 220 | 2.39.0 |
Patrick Williams | 8dd6848 | 2022-10-04 07:57:18 -0500 | [diff] [blame] | 221 | |