Add driver for the proprietary Mailbox controller (f_mhu) in MB86S7x. It has three channels - LowPri-NonSecure, HighPri-NonSecure and Secure. The MB86S7x communicates over the HighPri-NonSecure channel.
Signed-off-by: Jassi Brar <[email protected]> Signed-off-by: Tetsuya Takinishi <[email protected]> Signed-off-by: Mollie Wu <[email protected]> --- drivers/mailbox/Kconfig | 7 ++ drivers/mailbox/Makefile | 2 + drivers/mailbox/f_mhu.c | 227 +++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 236 insertions(+) create mode 100644 drivers/mailbox/f_mhu.c diff --git a/drivers/mailbox/Kconfig b/drivers/mailbox/Kconfig index c8b5c13..681aac2 100644 --- a/drivers/mailbox/Kconfig +++ b/drivers/mailbox/Kconfig @@ -6,6 +6,13 @@ menuconfig MAILBOX signals. Say Y if your platform supports hardware mailboxes. if MAILBOX + +config MBOX_F_MHU + bool + depends on ARCH_MB86S7X + help + Say Y here if you want to use the F_MHU IPCM support. + config PL320_MBOX bool "ARM PL320 Mailbox" depends on ARM_AMBA diff --git a/drivers/mailbox/Makefile b/drivers/mailbox/Makefile index 2fa343a..3707e93 100644 --- a/drivers/mailbox/Makefile +++ b/drivers/mailbox/Makefile @@ -2,6 +2,8 @@ obj-$(CONFIG_MAILBOX) += mailbox.o +obj-$(CONFIG_MBOX_F_MHU) += f_mhu.o + obj-$(CONFIG_PL320_MBOX) += pl320-ipc.o obj-$(CONFIG_OMAP_MBOX) += omap-mailbox.o diff --git a/drivers/mailbox/f_mhu.c b/drivers/mailbox/f_mhu.c new file mode 100644 index 0000000..cf5d3cd --- /dev/null +++ b/drivers/mailbox/f_mhu.c @@ -0,0 +1,227 @@ +/* + * Copyright (C) 2013-2014 Fujitsu Semiconductor Ltd. + * + * 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/clk.h> +#include <linux/module.h> +#include <linux/mailbox_controller.h> +#include <linux/platform_device.h> + +#define INTR_STAT_OFS 0x0 +#define INTR_SET_OFS 0x8 +#define INTR_CLR_OFS 0x10 + +#define MHU_SCFG 0x400 + +struct mhu_link { + unsigned irq; + spinlock_t lock; /* channel regs */ + void __iomem *tx_reg; + void __iomem *rx_reg; +}; + +struct f_mhu { + void __iomem *base; + struct clk *clk; + struct mhu_link mlink[3]; + struct mbox_chan chan[3]; + struct mbox_controller mbox; +}; + +static irqreturn_t mhu_rx_interrupt(int irq, void *p) +{ + struct mbox_chan *chan = (struct mbox_chan *)p; + struct mhu_link *mlink = (struct mhu_link *)chan->con_priv; + u32 val; + + pr_debug("%s:%d\n", __func__, __LINE__); + /* See NOTE_RX_DONE */ + val = readl_relaxed(mlink->rx_reg + INTR_STAT_OFS); + mbox_chan_received_data(chan, (void *)val); + + /* + * It is agreed with the remote firmware that the receiver + * will clear the STAT register indicating it is ready to + * receive next data - NOTE_RX_DONE + */ + writel_relaxed(val, mlink->rx_reg + INTR_CLR_OFS); + + return IRQ_HANDLED; +} + +static bool mhu_last_tx_done(struct mbox_chan *chan) +{ + struct mhu_link *mlink = (struct mhu_link *)chan->con_priv; + unsigned long flags; + u32 val; + + pr_debug("%s:%d\n", __func__, __LINE__); + spin_lock_irqsave(&mlink->lock, flags); + /* See NOTE_RX_DONE */ + val = readl_relaxed(mlink->tx_reg + INTR_STAT_OFS); + spin_unlock_irqrestore(&mlink->lock, flags); + + return (val == 0); +} + +static int mhu_send_data(struct mbox_chan *chan, void *data) +{ + struct mhu_link *mlink = (struct mhu_link *)chan->con_priv; + unsigned long flags; + + pr_debug("%s:%d\n", __func__, __LINE__); + if (!mhu_last_tx_done(chan)) { + pr_err("%s:%d Shouldn't have seen the day!\n", + __func__, __LINE__); + return -EBUSY; + } + + spin_lock_irqsave(&mlink->lock, flags); + writel_relaxed((u32)data, mlink->tx_reg + INTR_SET_OFS); + spin_unlock_irqrestore(&mlink->lock, flags); + + return 0; +} + +static int mhu_startup(struct mbox_chan *chan) +{ + struct mhu_link *mlink = (struct mhu_link *)chan->con_priv; + unsigned long flags; + u32 val; + int ret; + + pr_debug("%s:%d\n", __func__, __LINE__); + spin_lock_irqsave(&mlink->lock, flags); + val = readl_relaxed(mlink->tx_reg + INTR_STAT_OFS); + writel_relaxed(val, mlink->tx_reg + INTR_CLR_OFS); + spin_unlock_irqrestore(&mlink->lock, flags); + + ret = request_irq(mlink->irq, mhu_rx_interrupt, + IRQF_SHARED, "mhu_link", chan); + if (unlikely(ret)) { + pr_err("Unable to aquire IRQ\n"); + return ret; + } + + return 0; +} + +static void mhu_shutdown(struct mbox_chan *chan) +{ + struct mhu_link *mlink = (struct mhu_link *)chan->con_priv; + + pr_debug("%s:%d\n", __func__, __LINE__); + free_irq(mlink->irq, chan); +} + +static struct mbox_chan_ops mhu_ops = { + .send_data = mhu_send_data, + .startup = mhu_startup, + .shutdown = mhu_shutdown, + .last_tx_done = mhu_last_tx_done, +}; + +static int f_mhu_probe(struct platform_device *pdev) +{ + int i, err; + struct f_mhu *mhu; + struct resource *res; + int mhu_reg[3] = {0x0, 0x20, 0x200}; + + /* Allocate memory for device */ + mhu = kzalloc(sizeof(*mhu), GFP_KERNEL); + if (!mhu) { + dev_err(&pdev->dev, "failed to allocate memory.\n"); + return -EBUSY; + } + + mhu->clk = clk_get(&pdev->dev, "clk"); + if (unlikely(IS_ERR(mhu->clk))) { + dev_err(&pdev->dev, "unable to init clock\n"); + kfree(mhu); + return -EINVAL; + } + clk_prepare_enable(mhu->clk); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + mhu->base = ioremap(res->start, resource_size(res)); + if (!mhu->base) { + dev_err(&pdev->dev, "ioremap failed.\n"); + kfree(mhu); + return -EBUSY; + } + + /* Let UnTrustedOS's access violations don't bother us */ + writel_relaxed(0, mhu->base + MHU_SCFG); + + for (i = 0; i < 3; i++) { + mhu->chan[i].con_priv = &mhu->mlink[i]; + spin_lock_init(&mhu->mlink[i].lock); + res = platform_get_resource(pdev, IORESOURCE_IRQ, i); + mhu->mlink[i].irq = res->start; + mhu->mlink[i].rx_reg = mhu->base + mhu_reg[i]; + mhu->mlink[i].tx_reg = mhu->mlink[i].rx_reg + 0x100; + } + + mhu->mbox.dev = &pdev->dev; + mhu->mbox.chans = &mhu->chan[0]; + mhu->mbox.num_chans = 3; + mhu->mbox.ops = &mhu_ops; + mhu->mbox.txdone_irq = false; + mhu->mbox.txdone_poll = true; + mhu->mbox.txpoll_period = 10; + + platform_set_drvdata(pdev, mhu); + + err = mbox_controller_register(&mhu->mbox); + if (err) { + dev_err(&pdev->dev, "Failed to register mailboxes %d\n", err); + iounmap(mhu->base); + kfree(mhu); + } else { + dev_info(&pdev->dev, "Fujitsu MHU Mailbox registered\n"); + } + + return 0; +} + +static const struct of_device_id f_mhu_dt_ids[] = { + { .compatible = "fujitsu,mhu" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, f_mhu_dt_ids); + +static struct platform_driver f_mhu_driver = { + .driver = { + .name = "f_mhu", + .owner = THIS_MODULE, + .of_match_table = f_mhu_dt_ids, + }, + .probe = f_mhu_probe, +}; + +static int __init f_mhu_init(void) +{ + return platform_driver_register(&f_mhu_driver); +} +module_init(f_mhu_init); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("Fujitsu MHU Driver"); +MODULE_AUTHOR("Jassi Brar <[email protected]>"); -- 1.8.1.2 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
