driver: mailbox: Add mailbox driver

Add mailbox driver.

Signed-off-by: shanlong.li <shanlong.li@starfivetech.com>
Signed-off-by: Hal Feng <hal.feng@starfivetech.com>
This commit is contained in:
shanlong.li 2023-06-08 00:07:15 -07:00 committed by Hal Feng
parent f392f808dd
commit ad6c5a4872
4 changed files with 771 additions and 0 deletions

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@ -295,4 +295,17 @@ config QCOM_IPCC
acts as an interrupt controller for receiving interrupts from clients.
Say Y here if you want to build this driver.
config STARFIVE_MBOX
tristate "Platform Starfive Mailbox"
depends on OF
help
Say Y here if you want to build a platform specific variant RISCV
controller driver.
config STARFIVE_MBOX_TEST
tristate "Starfive Mailbox Test Client"
depends on OF
depends on HAS_IOMEM
help
Test client to help with testing new Controller driver implementations.
endif

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@ -62,3 +62,7 @@ obj-$(CONFIG_SPRD_MBOX) += sprd-mailbox.o
obj-$(CONFIG_QCOM_IPCC) += qcom-ipcc.o
obj-$(CONFIG_APPLE_MAILBOX) += apple-mailbox.o
obj-$(CONFIG_STARFIVE_MBOX) += starfive_mailbox.o
obj-$(CONFIG_STARFIVE_MBOX_TEST) += starfive_mailbox-test.o

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@ -0,0 +1,407 @@
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2015 ST Microelectronics
*
* Author: Lee Jones <lee.jones@linaro.org>
*/
#include <linux/debugfs.h>
#include <linux/err.h>
#include <linux/fs.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/mailbox_client.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/poll.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/sched/signal.h>
#include <linux/mailbox_controller.h>
#define MBOX_MAX_SIG_LEN 8
#define MBOX_MAX_MSG_LEN 16
#define MBOX_BYTES_PER_LINE 16
#define MBOX_HEXDUMP_LINE_LEN ((MBOX_BYTES_PER_LINE * 4) + 2)
#define MBOX_HEXDUMP_MAX_LEN (MBOX_HEXDUMP_LINE_LEN * (MBOX_MAX_MSG_LEN / MBOX_BYTES_PER_LINE))
static bool mbox_data_ready;
struct mbox_test_device {
struct device *dev;
void __iomem *tx_mmio;
void __iomem *rx_mmio;
struct mbox_chan *tx_channel;
struct mbox_chan *rx_channel;
char *rx_buffer;
char *signal;
char *message;
spinlock_t lock;
wait_queue_head_t waitq;
struct fasync_struct *async_queue;
struct dentry *root_debugfs_dir;
};
static ssize_t mbox_test_signal_write(struct file *filp,
const char __user *userbuf,
size_t count, loff_t *ppos)
{
struct mbox_test_device *tdev = filp->private_data;
if (!tdev->tx_channel) {
dev_err(tdev->dev, "Channel cannot do Tx\n");
return -EINVAL;
}
if (count > MBOX_MAX_SIG_LEN) {
dev_err(tdev->dev,
"Signal length %zd greater than max allowed %d\n",
count, MBOX_MAX_SIG_LEN);
return -EINVAL;
}
/* Only allocate memory if we need to */
if (!tdev->signal) {
tdev->signal = kzalloc(MBOX_MAX_SIG_LEN, GFP_KERNEL);
if (!tdev->signal)
return -ENOMEM;
}
if (copy_from_user(tdev->signal, userbuf, count)) {
kfree(tdev->signal);
tdev->signal = NULL;
return -EFAULT;
}
return count;
}
static const struct file_operations mbox_test_signal_ops = {
.write = mbox_test_signal_write,
.open = simple_open,
.llseek = generic_file_llseek,
};
static int mbox_test_message_fasync(int fd, struct file *filp, int on)
{
struct mbox_test_device *tdev = filp->private_data;
return fasync_helper(fd, filp, on, &tdev->async_queue);
}
static ssize_t mbox_test_message_write(struct file *filp,
const char __user *userbuf,
size_t count, loff_t *ppos)
{
struct mbox_test_device *tdev = filp->private_data;
void *data;
int ret;
if (!tdev->tx_channel) {
dev_err(tdev->dev, "Channel cannot do Tx\n");
return -EINVAL;
}
if (count > MBOX_MAX_MSG_LEN) {
dev_err(tdev->dev,
"Message length %zd greater than max allowed %d\n",
count, MBOX_MAX_MSG_LEN);
return -EINVAL;
}
tdev->message = kzalloc(MBOX_MAX_MSG_LEN, GFP_KERNEL);
if (!tdev->message)
return -ENOMEM;
ret = copy_from_user(tdev->message, userbuf, count);
if (ret) {
ret = -EFAULT;
goto out;
}
if (tdev->tx_mmio && tdev->signal) {
print_hex_dump_bytes("Client: Sending: Signal: ", DUMP_PREFIX_ADDRESS,
tdev->signal, MBOX_MAX_SIG_LEN);
data = tdev->signal;
} else
data = tdev->message;
print_hex_dump_bytes("Client: Sending: Message: ", DUMP_PREFIX_ADDRESS,
tdev->message, MBOX_MAX_MSG_LEN);
ret = mbox_send_message(tdev->tx_channel, data);
mbox_chan_txdone(tdev->tx_channel, ret);
if (ret < 0)
dev_err(tdev->dev, "Failed to send message via mailbox\n");
out:
kfree(tdev->signal);
kfree(tdev->message);
tdev->signal = NULL;
return ret < 0 ? ret : count;
}
static bool mbox_test_message_data_ready(struct mbox_test_device *tdev)
{
bool data_ready;
unsigned long flags;
spin_lock_irqsave(&tdev->lock, flags);
data_ready = mbox_data_ready;
spin_unlock_irqrestore(&tdev->lock, flags);
return data_ready;
}
static ssize_t mbox_test_message_read(struct file *filp, char __user *userbuf,
size_t count, loff_t *ppos)
{
struct mbox_test_device *tdev = filp->private_data;
unsigned long flags;
char *touser, *ptr;
int ret;
touser = kzalloc(MBOX_HEXDUMP_MAX_LEN + 1, GFP_KERNEL);
if (!touser)
return -ENOMEM;
if (!tdev->rx_channel) {
ret = snprintf(touser, 20, "<NO RX CAPABILITY>\n");
ret = simple_read_from_buffer(userbuf, count, ppos,
touser, ret);
goto kfree_err;
}
do {
if (mbox_test_message_data_ready(tdev))
break;
if (filp->f_flags & O_NONBLOCK) {
ret = -EAGAIN;
goto waitq_err;
}
if (signal_pending(current)) {
ret = -ERESTARTSYS;
goto waitq_err;
}
schedule();
} while (1);
spin_lock_irqsave(&tdev->lock, flags);
ptr = tdev->rx_buffer;
mbox_data_ready = false;
spin_unlock_irqrestore(&tdev->lock, flags);
if (copy_to_user((void __user *)userbuf, ptr, 4))
ret = -EFAULT;
waitq_err:
__set_current_state(TASK_RUNNING);
kfree_err:
kfree(touser);
return ret;
}
static __poll_t
mbox_test_message_poll(struct file *filp, struct poll_table_struct *wait)
{
struct mbox_test_device *tdev = filp->private_data;
poll_wait(filp, &tdev->waitq, wait);
if (mbox_test_message_data_ready(tdev))
return EPOLLIN | EPOLLRDNORM;
return 0;
}
static const struct file_operations mbox_test_message_ops = {
.write = mbox_test_message_write,
.read = mbox_test_message_read,
.fasync = mbox_test_message_fasync,
.poll = mbox_test_message_poll,
.open = simple_open,
.llseek = generic_file_llseek,
};
static int mbox_test_add_debugfs(struct platform_device *pdev,
struct mbox_test_device *tdev)
{
if (!debugfs_initialized())
return 0;
tdev->root_debugfs_dir = debugfs_create_dir(dev_name(&pdev->dev), NULL);
if (!tdev->root_debugfs_dir) {
dev_err(&pdev->dev, "Failed to create Mailbox debugfs\n");
return -EINVAL;
}
debugfs_create_file("message", 0600, tdev->root_debugfs_dir,
tdev, &mbox_test_message_ops);
debugfs_create_file("signal", 0200, tdev->root_debugfs_dir,
tdev, &mbox_test_signal_ops);
return 0;
}
static void mbox_test_receive_message(struct mbox_client *client, void *message)
{
struct mbox_test_device *tdev = dev_get_drvdata(client->dev);
unsigned long flags;
spin_lock_irqsave(&tdev->lock, flags);
if (tdev->rx_mmio) {
memcpy_fromio(tdev->rx_buffer, tdev->rx_mmio, MBOX_MAX_MSG_LEN);
print_hex_dump_bytes("Client: Received [MMIO]: ", DUMP_PREFIX_ADDRESS,
tdev->rx_buffer, MBOX_MAX_MSG_LEN);
} else if (message) {
print_hex_dump_bytes("Client: Received [API]: ", DUMP_PREFIX_ADDRESS,
message, MBOX_MAX_MSG_LEN);
memcpy(tdev->rx_buffer, message, MBOX_MAX_MSG_LEN);
}
mbox_data_ready = true;
spin_unlock_irqrestore(&tdev->lock, flags);
}
static void mbox_test_prepare_message(struct mbox_client *client, void *message)
{
struct mbox_test_device *tdev = dev_get_drvdata(client->dev);
if (tdev->tx_mmio) {
if (tdev->signal)
memcpy_toio(tdev->tx_mmio, tdev->message, MBOX_MAX_MSG_LEN);
else
memcpy_toio(tdev->tx_mmio, message, MBOX_MAX_MSG_LEN);
}
}
static struct mbox_chan *
mbox_test_request_channel(struct platform_device *pdev, const char *name)
{
struct mbox_client *client;
struct mbox_chan *channel;
client = devm_kzalloc(&pdev->dev, sizeof(*client), GFP_KERNEL);
if (!client)
return ERR_PTR(-ENOMEM);
client->dev = &pdev->dev;
client->rx_callback = mbox_test_receive_message;
client->tx_prepare = mbox_test_prepare_message;
client->tx_block = false;
client->knows_txdone = false;
client->tx_tout = 500;
channel = mbox_request_channel_byname(client, name);
if (IS_ERR(channel)) {
dev_warn(&pdev->dev, "Failed to request %s channel\n", name);
return NULL;
}
return channel;
}
static int mbox_test_probe(struct platform_device *pdev)
{
struct mbox_test_device *tdev;
struct resource *res;
resource_size_t size;
int ret;
tdev = devm_kzalloc(&pdev->dev, sizeof(*tdev), GFP_KERNEL);
if (!tdev)
return -ENOMEM;
/* It's okay for MMIO to be NULL */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
tdev->tx_mmio = devm_ioremap_resource(&pdev->dev, res);
if (PTR_ERR(tdev->tx_mmio) == -EBUSY) {
/* if reserved area in SRAM, try just ioremap */
size = resource_size(res);
tdev->tx_mmio = devm_ioremap(&pdev->dev, res->start, size);
} else if (IS_ERR(tdev->tx_mmio)) {
tdev->tx_mmio = NULL;
}
/* If specified, second reg entry is Rx MMIO */
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
tdev->rx_mmio = devm_ioremap_resource(&pdev->dev, res);
if (PTR_ERR(tdev->rx_mmio) == -EBUSY) {
size = resource_size(res);
tdev->rx_mmio = devm_ioremap(&pdev->dev, res->start, size);
} else if (IS_ERR(tdev->rx_mmio)) {
tdev->rx_mmio = tdev->tx_mmio;
}
tdev->tx_channel = mbox_test_request_channel(pdev, "tx");
tdev->rx_channel = mbox_test_request_channel(pdev, "rx");
if (!tdev->tx_channel && !tdev->rx_channel)
return -EPROBE_DEFER;
/* If Rx is not specified but has Rx MMIO, then Rx = Tx */
if (!tdev->rx_channel && (tdev->rx_mmio != tdev->tx_mmio))
tdev->rx_channel = tdev->tx_channel;
tdev->dev = &pdev->dev;
platform_set_drvdata(pdev, tdev);
spin_lock_init(&tdev->lock);
if (tdev->rx_channel) {
tdev->rx_buffer = devm_kzalloc(&pdev->dev,
MBOX_MAX_MSG_LEN, GFP_KERNEL);
if (!tdev->rx_buffer)
return -ENOMEM;
}
ret = mbox_test_add_debugfs(pdev, tdev);
if (ret)
return ret;
dev_info(&pdev->dev, "Successfully registered\n");
return 0;
}
static int mbox_test_remove(struct platform_device *pdev)
{
struct mbox_test_device *tdev = platform_get_drvdata(pdev);
debugfs_remove_recursive(tdev->root_debugfs_dir);
if (tdev->tx_channel)
mbox_free_channel(tdev->tx_channel);
if (tdev->rx_channel)
mbox_free_channel(tdev->rx_channel);
return 0;
}
static const struct of_device_id mbox_test_match[] = {
{ .compatible = "starfive,mailbox-test" },
{},
};
MODULE_DEVICE_TABLE(of, mbox_test_match);
static struct platform_driver mbox_test_driver = {
.driver = {
.name = "mailbox_test",
.of_match_table = mbox_test_match,
},
.probe = mbox_test_probe,
.remove = mbox_test_remove,
};
module_platform_driver(mbox_test_driver);
MODULE_DESCRIPTION("Generic Mailbox Testing Facility");
MODULE_AUTHOR("Lee Jones <lee.jones@linaro.org");
MODULE_LICENSE("GPL v2");

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@ -0,0 +1,347 @@
// SPDX-License-Identifier: GPL-2.0
/*
* mailbox driver for StarFive JH7110 SoC
*
* Copyright (c) 2021 StarFive Technology Co., Ltd.
* Author: Shanlong Li <shanlong.li@starfivetech.com>
*/
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/mailbox_controller.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/clk.h>
#include <linux/reset.h>
#include <linux/pm_runtime.h>
#include "mailbox.h"
#define MBOX_CHAN_MAX 4
#define MBOX_BASE(mbox, ch) ((mbox)->base + ((ch) * 0x10))
#define MBOX_IRQ_REG 0x00
#define MBOX_SET_REG 0x04
#define MBOX_CLR_REG 0x08
#define MBOX_CMD_REG 0x0c
#define MBC_PEND_SMRY 0x100
typedef enum {
MAILBOX_CORE_U7 = 0,
MAILBOX_CORE_HIFI4,
MAILBOX_CORE_E2,
MAILBOX_CORE_RSVD0,
MAILBOX_CORE_NUM,
} mailbox_core_t;
struct mailbox_irq_name_c{
int id;
char name[16];
};
static const struct mailbox_irq_name_c irq_peer_name[MBOX_CHAN_MAX] = {
{MAILBOX_CORE_U7, "u74_core"},
{MAILBOX_CORE_HIFI4, "hifi4_core"},
{MAILBOX_CORE_E2, "e24_core"},
{MAILBOX_CORE_RSVD0, "" },
};
/**
* starfive mailbox channel information
*
* A channel can be used for TX or RX, it can trigger remote
* processor interrupt to notify remote processor and can receive
* interrupt if has incoming message.
*
* @dst_irq: Interrupt vector for remote processor
* @core_id: id for remote processor
*/
struct starfive_chan_info {
unsigned int dst_irq;
mailbox_core_t core_id;
};
/**
* starfive mailbox controller data
*
* Mailbox controller includes 4 channels and can allocate
* channel for message transferring.
*
* @dev: Device to which it is attached
* @base: Base address of the register mapping region
* @chan: Representation of channels in mailbox controller
* @mchan: Representation of channel info
* @controller: Representation of a communication channel controller
*/
struct starfive_mbox {
struct device *dev;
void __iomem *base;
struct mbox_chan chan[MBOX_CHAN_MAX];
struct starfive_chan_info mchan[MBOX_CHAN_MAX];
struct mbox_controller controller;
struct clk *clk;
struct reset_control *rst_rresetn;
};
static struct starfive_mbox *to_starfive_mbox(struct mbox_controller *mbox)
{
return container_of(mbox, struct starfive_mbox, controller);
}
static struct mbox_chan *
starfive_of_mbox_index_xlate(struct mbox_controller *mbox,
const struct of_phandle_args *sp)
{
struct starfive_mbox *sbox;
int ind = sp->args[0];
int core_id = sp->args[1];
if (ind >= mbox->num_chans || core_id >= MAILBOX_CORE_NUM)
return ERR_PTR(-EINVAL);
sbox = to_starfive_mbox(mbox);
sbox->mchan[ind].core_id = core_id;
return &mbox->chans[ind];
}
static irqreturn_t starfive_rx_irq_handler(int irq, void *p)
{
struct mbox_chan *chan = p;
unsigned long ch = (unsigned long)chan->con_priv;
struct starfive_mbox *mbox = to_starfive_mbox(chan->mbox);
void __iomem *base = MBOX_BASE(mbox, ch);
u32 val;
val = readl(base + MBOX_CMD_REG);
if (!val)
return IRQ_NONE;
mbox_chan_received_data(chan, (void *)&val);
writel(val, base + MBOX_CLR_REG);
return IRQ_HANDLED;
}
static int starfive_mbox_check_state(struct mbox_chan *chan)
{
unsigned long ch = (unsigned long)chan->con_priv;
struct starfive_mbox *mbox = to_starfive_mbox(chan->mbox);
unsigned long irq_flag = IRQF_SHARED;
long ret = 0;
pm_runtime_get_sync(mbox->dev);
/* MAILBOX should be with IRQF_NO_SUSPEND set */
if (!mbox->dev->pm_domain)
irq_flag |= IRQF_NO_SUSPEND;
/* Mailbox is idle so directly bail out */
if (readl(mbox->base + MBC_PEND_SMRY) & BIT(ch))
return -EBUSY;
if (mbox->mchan[ch].dst_irq > 0) {
dev_dbg(mbox->dev, "%s: host IRQ = %d, ch:%ld", __func__, mbox->mchan[ch].dst_irq, ch);
ret = devm_request_irq(mbox->dev, mbox->mchan[ch].dst_irq, starfive_rx_irq_handler,
irq_flag, irq_peer_name[ch].name, chan);
if (ret < 0)
dev_err(mbox->dev, "request_irq %d failed\n", mbox->mchan[ch].dst_irq);
}
return ret;
}
static int starfive_mbox_startup(struct mbox_chan *chan)
{
return starfive_mbox_check_state(chan);
}
static void starfive_mbox_shutdown(struct mbox_chan *chan)
{
struct starfive_mbox *mbox = to_starfive_mbox(chan->mbox);
unsigned long ch = (unsigned long)chan->con_priv;
void __iomem *base = MBOX_BASE(mbox, ch);
writel(0x0, base + MBOX_IRQ_REG);
writel(0x0, base + MBOX_CLR_REG);
if (mbox->mchan[ch].dst_irq > 0)
devm_free_irq(mbox->dev, mbox->mchan[ch].dst_irq, chan);
pm_runtime_put_sync(mbox->dev);
}
static int starfive_mbox_send_data(struct mbox_chan *chan, void *msg)
{
unsigned long ch = (unsigned long)chan->con_priv;
struct starfive_mbox *mbox = to_starfive_mbox(chan->mbox);
struct starfive_chan_info *mchan = &mbox->mchan[ch];
void __iomem *base = MBOX_BASE(mbox, ch);
u32 *buf = msg;
/* Ensure channel is released */
if (readl(mbox->base + MBC_PEND_SMRY) & BIT(ch)) {
pr_debug("%s:%d. busy\n", __func__, __LINE__);
return -EBUSY;
}
/* Clear mask for destination interrupt */
writel(BIT(mchan->core_id), base + MBOX_IRQ_REG);
/* Fill message data */
writel(*buf, base + MBOX_SET_REG);
return 0;
}
static struct mbox_chan_ops starfive_mbox_ops = {
.startup = starfive_mbox_startup,
.send_data = starfive_mbox_send_data,
.shutdown = starfive_mbox_shutdown,
};
static const struct of_device_id starfive_mbox_of_match[] = {
{ .compatible = "starfive,mail_box",},
{},
};
MODULE_DEVICE_TABLE(of, starfive_mbox_of_match);
void starfive_mailbox_init(struct starfive_mbox *mbox)
{
mbox->clk = devm_clk_get_optional(mbox->dev, "clk_apb");
if (IS_ERR(mbox->clk)) {
dev_err(mbox->dev, "failed to get mailbox\n");
return;
}
mbox->rst_rresetn = devm_reset_control_get_exclusive(mbox->dev, "mbx_rre");
if (IS_ERR(mbox->rst_rresetn)) {
dev_err(mbox->dev, "failed to get mailbox reset\n");
return;
}
clk_prepare_enable(mbox->clk);
reset_control_deassert(mbox->rst_rresetn);
}
static int starfive_mbox_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct starfive_mbox *mbox;
struct mbox_chan *chan;
struct resource *res;
unsigned long ch;
int err;
mbox = devm_kzalloc(dev, sizeof(*mbox), GFP_KERNEL);
if (!mbox)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
mbox->base = devm_ioremap_resource(dev, res);
mbox->dev = dev;
if (IS_ERR(mbox->base))
return PTR_ERR(mbox->base);
starfive_mailbox_init(mbox);
mbox->controller.dev = dev;
mbox->controller.chans = mbox->chan;
mbox->controller.num_chans = MBOX_CHAN_MAX;
mbox->controller.ops = &starfive_mbox_ops;
mbox->controller.of_xlate = starfive_of_mbox_index_xlate;
mbox->controller.txdone_irq = true;
mbox->controller.txdone_poll = false;
/* Initialize mailbox channel data */
chan = mbox->chan;
for (ch = 0; ch < MBOX_CHAN_MAX; ch++) {
mbox->mchan[ch].dst_irq = 0;
mbox->mchan[ch].core_id = (mailbox_core_t)ch;
chan[ch].con_priv = (void *)ch;
}
mbox->mchan[MAILBOX_CORE_HIFI4].dst_irq = platform_get_irq(pdev, 0);
mbox->mchan[MAILBOX_CORE_E2].dst_irq = platform_get_irq(pdev, 1);
err = mbox_controller_register(&mbox->controller);
if (err) {
dev_err(dev, "Failed to register mailbox %d\n", err);
return err;
}
platform_set_drvdata(pdev, mbox);
dev_info(dev, "Mailbox enabled\n");
pm_runtime_set_active(dev);
pm_runtime_enable(dev);
return 0;
}
static int starfive_mbox_remove(struct platform_device *pdev)
{
struct starfive_mbox *mbox = platform_get_drvdata(pdev);
mbox_controller_unregister(&mbox->controller);
devm_clk_put(mbox->dev, mbox->clk);
pm_runtime_disable(mbox->dev);
return 0;
}
static int __maybe_unused starfive_mbox_suspend(struct device *dev)
{
struct starfive_mbox *mbox = dev_get_drvdata(dev);
clk_disable_unprepare(mbox->clk);
return 0;
}
static int __maybe_unused starfive_mbox_resume(struct device *dev)
{
struct starfive_mbox *mbox = dev_get_drvdata(dev);
int ret;
ret = clk_prepare_enable(mbox->clk);
if (ret)
dev_err(dev, "failed to enable clock\n");
return ret;
}
static const struct dev_pm_ops starfive_mbox_pm_ops = {
.suspend = starfive_mbox_suspend,
.resume = starfive_mbox_resume,
SET_RUNTIME_PM_OPS(starfive_mbox_suspend, starfive_mbox_resume, NULL)
};
static struct platform_driver starfive_mbox_driver = {
.probe = starfive_mbox_probe,
.remove = starfive_mbox_remove,
.driver = {
.name = "mailbox",
.of_match_table = starfive_mbox_of_match,
.pm = &starfive_mbox_pm_ops,
},
};
static int __init starfive_mbox_init(void)
{
return platform_driver_register(&starfive_mbox_driver);
}
core_initcall(starfive_mbox_init);
static void __exit starfive_mbox_exit(void)
{
platform_driver_unregister(&starfive_mbox_driver);
}
module_exit(starfive_mbox_exit);
MODULE_DESCRIPTION("StarFive Mailbox Controller driver");
MODULE_AUTHOR("Shanlong Li <shanlong.li@starfivetech.com>");
MODULE_LICENSE("GPL");