Add Amlogic Meson SoCs Message-Handling-Unit as mailbox controller with 2 independent channels/links to communicate with a remote processor.
Signed-off-by: Neil Armstrong <[email protected]> --- drivers/mailbox/Makefile | 2 + drivers/mailbox/meson_mhu.c | 199 ++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 201 insertions(+) create mode 100644 drivers/mailbox/meson_mhu.c diff --git a/drivers/mailbox/Makefile b/drivers/mailbox/Makefile index 0be3e74..6aa9dbe 100644 --- a/drivers/mailbox/Makefile +++ b/drivers/mailbox/Makefile @@ -25,3 +25,5 @@ obj-$(CONFIG_TI_MESSAGE_MANAGER) += ti-msgmgr.o obj-$(CONFIG_XGENE_SLIMPRO_MBOX) += mailbox-xgene-slimpro.o obj-$(CONFIG_HI6220_MBOX) += hi6220-mailbox.o + +obj-$(CONFIG_ARCH_MESON) += meson_mhu.o diff --git a/drivers/mailbox/meson_mhu.c b/drivers/mailbox/meson_mhu.c new file mode 100644 index 0000000..0576b92 --- /dev/null +++ b/drivers/mailbox/meson_mhu.c @@ -0,0 +1,199 @@ +/* + * Copyright (C) 2016 BayLibre SAS. + * Author: Neil Armstrong <[email protected]> + * Heavily based on meson_mhu.c from : + * Copyright (C) 2013-2015 Fujitsu Semiconductor Ltd. + * Copyright (C) 2015 Linaro Ltd. + * Author: Jassi Brar <[email protected]> + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/interrupt.h> +#include <linux/spinlock.h> +#include <linux/mutex.h> +#include <linux/delay.h> +#include <linux/slab.h> +#include <linux/err.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/mailbox_controller.h> + +#define INTR_SET_OFS 0x0 +#define INTR_STAT_OFS 0x4 +#define INTR_CLR_OFS 0x8 + +#define MHU_LP_OFFSET 0x10 +#define MHU_HP_OFFSET 0x1c + +#define TX_REG_OFFSET 0x24 + +#define MHU_CHANS 2 + +struct meson_mhu_link { + unsigned int irq; + void __iomem *tx_reg; + void __iomem *rx_reg; +}; + +struct meson_mhu { + void __iomem *base; + struct meson_mhu_link mlink[MHU_CHANS]; + struct mbox_chan chan[MHU_CHANS]; + struct mbox_controller mbox; +}; + +static irqreturn_t meson_mhu_rx_interrupt(int irq, void *p) +{ + struct mbox_chan *chan = p; + struct meson_mhu_link *mlink = chan->con_priv; + u32 val; + + val = readl_relaxed(mlink->rx_reg + INTR_STAT_OFS); + if (!val) + return IRQ_NONE; + + mbox_chan_received_data(chan, (void *)&val); + + writel_relaxed(~0, mlink->rx_reg + INTR_CLR_OFS); + + return IRQ_HANDLED; +} + +static bool meson_mhu_last_tx_done(struct mbox_chan *chan) +{ + struct meson_mhu_link *mlink = chan->con_priv; + u32 val = readl_relaxed(mlink->tx_reg + INTR_STAT_OFS); + + return (val == 0); +} + +static int meson_mhu_send_data(struct mbox_chan *chan, void *data) +{ + struct meson_mhu_link *mlink = chan->con_priv; + u32 *arg = data; + + writel_relaxed(*arg, mlink->tx_reg + INTR_SET_OFS); + + return 0; +} + +static int meson_mhu_startup(struct mbox_chan *chan) +{ + struct meson_mhu_link *mlink = chan->con_priv; + int ret; + + ret = request_irq(mlink->irq, meson_mhu_rx_interrupt, + IRQF_ONESHOT, "meson_mhu_link", chan); + if (ret) { + dev_err(chan->mbox->dev, + "Unable to acquire IRQ %d\n", mlink->irq); + return ret; + } + + return 0; +} + +static void meson_mhu_shutdown(struct mbox_chan *chan) +{ + struct meson_mhu_link *mlink = chan->con_priv; + + free_irq(mlink->irq, chan); +} + +static const struct mbox_chan_ops meson_mhu_ops = { + .send_data = meson_mhu_send_data, + .startup = meson_mhu_startup, + .shutdown = meson_mhu_shutdown, + .last_tx_done = meson_mhu_last_tx_done, +}; + +static int meson_mhu_probe(struct platform_device *pdev) +{ + int i, err; + struct meson_mhu *mhu; + struct device *dev = &pdev->dev; + struct resource *res; + int meson_mhu_reg[MHU_CHANS] = {MHU_LP_OFFSET, MHU_HP_OFFSET}; + + /* Allocate memory for device */ + mhu = devm_kzalloc(dev, sizeof(*mhu), GFP_KERNEL); + if (!mhu) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + mhu->base = devm_ioremap_resource(dev, res); + if (IS_ERR(mhu->base)) { + dev_err(dev, "ioremap failed\n"); + return PTR_ERR(mhu->base); + } + + for (i = 0; i < MHU_CHANS; i++) { + mhu->chan[i].con_priv = &mhu->mlink[i]; + mhu->mlink[i].irq = platform_get_irq(pdev, i); + if (mhu->mlink[i].irq < 0) { + dev_err(dev, "failed to get irq%d\n", i); + return mhu->mlink[i].irq; + } + mhu->mlink[i].rx_reg = mhu->base + meson_mhu_reg[i]; + mhu->mlink[i].tx_reg = mhu->mlink[i].rx_reg + TX_REG_OFFSET; + } + + mhu->mbox.dev = dev; + mhu->mbox.chans = &mhu->chan[0]; + mhu->mbox.num_chans = MHU_CHANS; + mhu->mbox.ops = &meson_mhu_ops; + mhu->mbox.txdone_irq = false; + mhu->mbox.txdone_poll = true; + mhu->mbox.txpoll_period = 1; + + platform_set_drvdata(pdev, mhu); + + err = mbox_controller_register(&mhu->mbox); + if (err) { + dev_err(dev, "Failed to register mailboxes %d\n", err); + return err; + } + + dev_info(dev, "Meson MHU Mailbox registered\n"); + return 0; +} + +static int meson_mhu_remove(struct platform_device *pdev) +{ + struct meson_mhu *mhu = platform_get_drvdata(pdev); + + mbox_controller_unregister(&mhu->mbox); + + return 0; +} + +static const struct of_device_id meson_mhu_dt_ids[] = { + { .compatible = "amlogic,meson-gxbb-mhu", }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, meson_mhu_ids); + +static struct platform_driver meson_wdt_driver = { + .probe = meson_mhu_probe, + .remove = meson_mhu_remove, + .driver = { + .name = "meson-mhu", + .of_match_table = meson_mhu_dt_ids, + }, +}; + +module_platform_driver(meson_wdt_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:meson-mhu"); +MODULE_DESCRIPTION("Amlogic Meson MHU Driver"); +MODULE_AUTHOR("Neil Armstrong <[email protected]>"); -- 2.7.0
