From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- drivers/mailbox/hi3660-mailbox.c | 298 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 298 insertions(+) create mode 100644 drivers/mailbox/hi3660-mailbox.c (limited to 'drivers/mailbox/hi3660-mailbox.c') diff --git a/drivers/mailbox/hi3660-mailbox.c b/drivers/mailbox/hi3660-mailbox.c new file mode 100644 index 0000000000..17c29e960f --- /dev/null +++ b/drivers/mailbox/hi3660-mailbox.c @@ -0,0 +1,298 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (c) 2017-2018 HiSilicon Limited. +// Copyright (c) 2017-2018 Linaro Limited. + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "mailbox.h" + +#define MBOX_CHAN_MAX 32 + +#define MBOX_RX 0x0 +#define MBOX_TX 0x1 + +#define MBOX_BASE(mbox, ch) ((mbox)->base + ((ch) * 0x40)) +#define MBOX_SRC_REG 0x00 +#define MBOX_DST_REG 0x04 +#define MBOX_DCLR_REG 0x08 +#define MBOX_DSTAT_REG 0x0c +#define MBOX_MODE_REG 0x10 +#define MBOX_IMASK_REG 0x14 +#define MBOX_ICLR_REG 0x18 +#define MBOX_SEND_REG 0x1c +#define MBOX_DATA_REG 0x20 + +#define MBOX_IPC_LOCK_REG 0xa00 +#define MBOX_IPC_UNLOCK 0x1acce551 + +#define MBOX_AUTOMATIC_ACK 1 + +#define MBOX_STATE_IDLE BIT(4) +#define MBOX_STATE_READY BIT(5) +#define MBOX_STATE_ACK BIT(7) + +#define MBOX_MSG_LEN 8 + +/** + * struct hi3660_chan_info - Hi3660 mailbox channel information + * @dst_irq: Interrupt vector for remote processor + * @ack_irq: Interrupt vector for local processor + * + * A channel can be used for TX or RX, it can trigger remote + * processor interrupt to notify remote processor and can receive + * interrupt if it has an incoming message. + */ +struct hi3660_chan_info { + unsigned int dst_irq; + unsigned int ack_irq; +}; + +/** + * struct hi3660_mbox - Hi3660 mailbox controller data + * @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 + * + * Mailbox controller includes 32 channels and can allocate + * channel for message transferring. + */ +struct hi3660_mbox { + struct device *dev; + void __iomem *base; + struct mbox_chan chan[MBOX_CHAN_MAX]; + struct hi3660_chan_info mchan[MBOX_CHAN_MAX]; + struct mbox_controller controller; +}; + +static struct hi3660_mbox *to_hi3660_mbox(struct mbox_controller *mbox) +{ + return container_of(mbox, struct hi3660_mbox, controller); +} + +static int hi3660_mbox_check_state(struct mbox_chan *chan) +{ + unsigned long ch = (unsigned long)chan->con_priv; + struct hi3660_mbox *mbox = to_hi3660_mbox(chan->mbox); + struct hi3660_chan_info *mchan = &mbox->mchan[ch]; + void __iomem *base = MBOX_BASE(mbox, ch); + unsigned long val; + unsigned int ret; + + /* Mailbox is ready to use */ + if (readl(base + MBOX_MODE_REG) & MBOX_STATE_READY) + return 0; + + /* Wait for acknowledge from remote */ + ret = readx_poll_timeout_atomic(readl, base + MBOX_MODE_REG, + val, (val & MBOX_STATE_ACK), 1000, 300000); + if (ret) { + dev_err(mbox->dev, "%s: timeout for receiving ack\n", __func__); + return ret; + } + + /* clear ack state, mailbox will get back to ready state */ + writel(BIT(mchan->ack_irq), base + MBOX_ICLR_REG); + + return 0; +} + +static int hi3660_mbox_unlock(struct mbox_chan *chan) +{ + struct hi3660_mbox *mbox = to_hi3660_mbox(chan->mbox); + unsigned int val, retry = 3; + + do { + writel(MBOX_IPC_UNLOCK, mbox->base + MBOX_IPC_LOCK_REG); + + val = readl(mbox->base + MBOX_IPC_LOCK_REG); + if (!val) + break; + + udelay(10); + } while (retry--); + + if (val) + dev_err(mbox->dev, "%s: failed to unlock mailbox\n", __func__); + + return (!val) ? 0 : -ETIMEDOUT; +} + +static int hi3660_mbox_acquire_channel(struct mbox_chan *chan) +{ + unsigned long ch = (unsigned long)chan->con_priv; + struct hi3660_mbox *mbox = to_hi3660_mbox(chan->mbox); + struct hi3660_chan_info *mchan = &mbox->mchan[ch]; + void __iomem *base = MBOX_BASE(mbox, ch); + unsigned int val, retry; + + for (retry = 10; retry; retry--) { + /* Check if channel is in idle state */ + if (readl(base + MBOX_MODE_REG) & MBOX_STATE_IDLE) { + writel(BIT(mchan->ack_irq), base + MBOX_SRC_REG); + + /* Check ack bit has been set successfully */ + val = readl(base + MBOX_SRC_REG); + if (val & BIT(mchan->ack_irq)) + break; + } + } + + if (!retry) + dev_err(mbox->dev, "%s: failed to acquire channel\n", __func__); + + return retry ? 0 : -ETIMEDOUT; +} + +static int hi3660_mbox_startup(struct mbox_chan *chan) +{ + int ret; + + ret = hi3660_mbox_unlock(chan); + if (ret) + return ret; + + ret = hi3660_mbox_acquire_channel(chan); + if (ret) + return ret; + + return 0; +} + +static int hi3660_mbox_send_data(struct mbox_chan *chan, void *msg) +{ + unsigned long ch = (unsigned long)chan->con_priv; + struct hi3660_mbox *mbox = to_hi3660_mbox(chan->mbox); + struct hi3660_chan_info *mchan = &mbox->mchan[ch]; + void __iomem *base = MBOX_BASE(mbox, ch); + u32 *buf = msg; + unsigned int i; + int ret; + + ret = hi3660_mbox_check_state(chan); + if (ret) + return ret; + + /* Clear mask for destination interrupt */ + writel_relaxed(~BIT(mchan->dst_irq), base + MBOX_IMASK_REG); + + /* Config destination for interrupt vector */ + writel_relaxed(BIT(mchan->dst_irq), base + MBOX_DST_REG); + + /* Automatic acknowledge mode */ + writel_relaxed(MBOX_AUTOMATIC_ACK, base + MBOX_MODE_REG); + + /* Fill message data */ + for (i = 0; i < MBOX_MSG_LEN; i++) + writel_relaxed(buf[i], base + MBOX_DATA_REG + i * 4); + + /* Trigger data transferring */ + writel(BIT(mchan->ack_irq), base + MBOX_SEND_REG); + return 0; +} + +static const struct mbox_chan_ops hi3660_mbox_ops = { + .startup = hi3660_mbox_startup, + .send_data = hi3660_mbox_send_data, +}; + +static struct mbox_chan *hi3660_mbox_xlate(struct mbox_controller *controller, + const struct of_phandle_args *spec) +{ + struct hi3660_mbox *mbox = to_hi3660_mbox(controller); + struct hi3660_chan_info *mchan; + unsigned int ch = spec->args[0]; + + if (ch >= MBOX_CHAN_MAX) { + dev_err(mbox->dev, "Invalid channel idx %d\n", ch); + return ERR_PTR(-EINVAL); + } + + mchan = &mbox->mchan[ch]; + mchan->dst_irq = spec->args[1]; + mchan->ack_irq = spec->args[2]; + + return &mbox->chan[ch]; +} + +static const struct of_device_id hi3660_mbox_of_match[] = { + { .compatible = "hisilicon,hi3660-mbox", }, + {}, +}; + +MODULE_DEVICE_TABLE(of, hi3660_mbox_of_match); + +static int hi3660_mbox_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct hi3660_mbox *mbox; + struct mbox_chan *chan; + unsigned long ch; + int err; + + mbox = devm_kzalloc(dev, sizeof(*mbox), GFP_KERNEL); + if (!mbox) + return -ENOMEM; + + mbox->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(mbox->base)) + return PTR_ERR(mbox->base); + + mbox->dev = dev; + mbox->controller.dev = dev; + mbox->controller.chans = mbox->chan; + mbox->controller.num_chans = MBOX_CHAN_MAX; + mbox->controller.ops = &hi3660_mbox_ops; + mbox->controller.of_xlate = hi3660_mbox_xlate; + + /* Initialize mailbox channel data */ + chan = mbox->chan; + for (ch = 0; ch < MBOX_CHAN_MAX; ch++) + chan[ch].con_priv = (void *)ch; + + err = devm_mbox_controller_register(dev, &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"); + return 0; +} + +static struct platform_driver hi3660_mbox_driver = { + .probe = hi3660_mbox_probe, + .driver = { + .name = "hi3660-mbox", + .of_match_table = hi3660_mbox_of_match, + }, +}; + +static int __init hi3660_mbox_init(void) +{ + return platform_driver_register(&hi3660_mbox_driver); +} +core_initcall(hi3660_mbox_init); + +static void __exit hi3660_mbox_exit(void) +{ + platform_driver_unregister(&hi3660_mbox_driver); +} +module_exit(hi3660_mbox_exit); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Hisilicon Hi3660 Mailbox Controller"); +MODULE_AUTHOR("Leo Yan "); -- cgit v1.2.3