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 <narmstrong@baylibre.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>hifive-unleashed-5.1
Neil Armstrong
Jassi Brar
parent
d060e0f603
commit
ad3a212c1d
|
|
@ -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
|
||||
|
|
|
|||
|
|
@ -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
|
||||
|
|
|
|||
|
|
@ -0,0 +1,205 @@
|
|||
/*
|
||||
* Copyright (C) 2016 BayLibre SAS.
|
||||
* Author: Neil Armstrong <narmstrong@baylibre.com>
|
||||
* Synchronised with arm_mhu.c from :
|
||||
* Copyright (C) 2013-2015 Fujitsu Semiconductor Ltd.
|
||||
* Copyright (C) 2015 Linaro Ltd.
|
||||
* Author: Jassi Brar <jaswinder.singh@linaro.org>
|
||||
*
|
||||
* 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_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 <narmstrong@baylibre.com>");
|
||||
Loading…
Reference in New Issue