forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
187 lines
4.5 KiB
187 lines
4.5 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
|
* Copyright (C) 2016 BayLibre SAS. |
|
* Author: Neil Armstrong <[email protected]> |
|
* Synchronised with arm_mhu.c from : |
|
* Copyright (C) 2013-2015 Fujitsu Semiconductor Ltd. |
|
* Copyright (C) 2015 Linaro Ltd. |
|
* Author: Jassi Brar <[email protected]> |
|
*/ |
|
|
|
#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 = devm_mbox_controller_register(dev, &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 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, |
|
.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 <[email protected]>");
|
|
|