From ad3a212c1db1650b1f6e438201494c7bb7111f54 Mon Sep 17 00:00:00 2001 From: Neil Armstrong Date: Thu, 18 Aug 2016 12:10:25 +0200 Subject: [PATCH] mailbox: Add Platform Message-Handling-Unit variant driver Add Message-Handling-Unit driver for platform variants as mailbox controller. Actually, only the Amlogic Meson GXBB SoC MHU is supported. Signed-off-by: Neil Armstrong Signed-off-by: Jassi Brar --- drivers/mailbox/Kconfig | 10 ++ drivers/mailbox/Makefile | 2 + drivers/mailbox/platform_mhu.c | 205 +++++++++++++++++++++++++++++++++ 3 files changed, 217 insertions(+) create mode 100644 drivers/mailbox/platform_mhu.c diff --git a/drivers/mailbox/Kconfig b/drivers/mailbox/Kconfig index 7817d40d81e7..11eebfe8a4cb 100644 --- a/drivers/mailbox/Kconfig +++ b/drivers/mailbox/Kconfig @@ -15,6 +15,16 @@ config ARM_MHU The controller has 3 mailbox channels, the last of which can be used in Secure mode only. +config PLATFORM_MHU + tristate "Platform MHU Mailbox" + depends on OF + depends on HAS_IOMEM + help + Say Y here if you want to build a platform specific variant MHU + controller driver. + The controller has a maximum of 3 mailbox channels, the last of + which can be used in Secure mode only. + config PL320_MBOX bool "ARM PL320 Mailbox" depends on ARM_AMBA diff --git a/drivers/mailbox/Makefile b/drivers/mailbox/Makefile index 66c38e300dfc..ace6fed8fea9 100644 --- a/drivers/mailbox/Makefile +++ b/drivers/mailbox/Makefile @@ -6,6 +6,8 @@ obj-$(CONFIG_MAILBOX_TEST) += mailbox-test.o obj-$(CONFIG_ARM_MHU) += arm_mhu.o +obj-$(CONFIG_PLATFORM_MHU) += platform_mhu.o + obj-$(CONFIG_PL320_MBOX) += pl320-ipc.o obj-$(CONFIG_OMAP2PLUS_MBOX) += omap-mailbox.o diff --git a/drivers/mailbox/platform_mhu.c b/drivers/mailbox/platform_mhu.c new file mode 100644 index 000000000000..e13201a5cec6 --- /dev/null +++ b/drivers/mailbox/platform_mhu.c @@ -0,0 +1,205 @@ +/* + * Copyright (C) 2016 BayLibre SAS. + * Author: Neil Armstrong + * Synchronised with arm_mhu.c from : + * Copyright (C) 2013-2015 Fujitsu Semiconductor Ltd. + * Copyright (C) 2015 Linaro Ltd. + * Author: Jassi Brar + * + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define INTR_SET_OFS 0x0 +#define INTR_STAT_OFS 0x4 +#define INTR_CLR_OFS 0x8 + +#define MHU_SEC_OFFSET 0x0 +#define MHU_LP_OFFSET 0xc +#define MHU_HP_OFFSET 0x18 +#define TX_REG_OFFSET 0x24 + +#define MHU_CHANS 3 + +struct platform_mhu_link { + int irq; + void __iomem *tx_reg; + void __iomem *rx_reg; +}; + +struct platform_mhu { + void __iomem *base; + struct platform_mhu_link mlink[MHU_CHANS]; + struct mbox_chan chan[MHU_CHANS]; + struct mbox_controller mbox; +}; + +static irqreturn_t platform_mhu_rx_interrupt(int irq, void *p) +{ + struct mbox_chan *chan = p; + struct platform_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(val, mlink->rx_reg + INTR_CLR_OFS); + + return IRQ_HANDLED; +} + +static bool platform_mhu_last_tx_done(struct mbox_chan *chan) +{ + struct platform_mhu_link *mlink = chan->con_priv; + u32 val = readl_relaxed(mlink->tx_reg + INTR_STAT_OFS); + + return (val == 0); +} + +static int platform_mhu_send_data(struct mbox_chan *chan, void *data) +{ + struct platform_mhu_link *mlink = chan->con_priv; + u32 *arg = data; + + writel_relaxed(*arg, mlink->tx_reg + INTR_SET_OFS); + + return 0; +} + +static int platform_mhu_startup(struct mbox_chan *chan) +{ + struct platform_mhu_link *mlink = chan->con_priv; + u32 val; + int ret; + + val = readl_relaxed(mlink->tx_reg + INTR_STAT_OFS); + writel_relaxed(val, mlink->tx_reg + INTR_CLR_OFS); + + ret = request_irq(mlink->irq, platform_mhu_rx_interrupt, + IRQF_SHARED, "platform_mhu_link", chan); + if (ret) { + dev_err(chan->mbox->dev, + "Unable to acquire IRQ %d\n", mlink->irq); + return ret; + } + + return 0; +} + +static void platform_mhu_shutdown(struct mbox_chan *chan) +{ + struct platform_mhu_link *mlink = chan->con_priv; + + free_irq(mlink->irq, chan); +} + +static const struct mbox_chan_ops platform_mhu_ops = { + .send_data = platform_mhu_send_data, + .startup = platform_mhu_startup, + .shutdown = platform_mhu_shutdown, + .last_tx_done = platform_mhu_last_tx_done, +}; + +static int platform_mhu_probe(struct platform_device *pdev) +{ + int i, err; + struct platform_mhu *mhu; + struct device *dev = &pdev->dev; + struct resource *res; + int platform_mhu_reg[MHU_CHANS] = { + MHU_SEC_OFFSET, 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 + platform_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 = &platform_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, "Platform MHU Mailbox registered\n"); + return 0; +} + +static int platform_mhu_remove(struct platform_device *pdev) +{ + struct platform_mhu *mhu = platform_get_drvdata(pdev); + + mbox_controller_unregister(&mhu->mbox); + + return 0; +} + +static const struct of_device_id platform_mhu_dt_ids[] = { + { .compatible = "amlogic,meson-gxbb-mhu", }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, platform_mhu_dt_ids); + +static struct platform_driver platform_mhu_driver = { + .probe = platform_mhu_probe, + .remove = platform_mhu_remove, + .driver = { + .name = "platform-mhu", + .of_match_table = platform_mhu_dt_ids, + }, +}; + +module_platform_driver(platform_mhu_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:platform-mhu"); +MODULE_DESCRIPTION("Platform MHU Driver"); +MODULE_AUTHOR("Neil Armstrong ");