--- /dev/null
+// 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");
--- /dev/null
+// 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");
projects / platform / kernel / linux-starfive.git / commitdiff