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.
395 lines
9.7 KiB
395 lines
9.7 KiB
/*
|
|
* Hisilicon's Hi6220 mailbox driver
|
|
*
|
|
* Copyright (c) 2015 Hisilicon Limited.
|
|
* Copyright (c) 2015 Linaro Limited.
|
|
*
|
|
* Author: Leo Yan <leo.yan@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/device.h>
|
|
#include <linux/err.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/io.h>
|
|
#include <linux/kfifo.h>
|
|
#include <linux/mailbox_controller.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/slab.h>
|
|
|
|
#define MBOX_CHAN_MAX 32
|
|
|
|
#define MBOX_TX 0x1
|
|
|
|
/* Mailbox message length: 8 words */
|
|
#define MBOX_MSG_LEN 8
|
|
|
|
/* Mailbox Registers */
|
|
#define MBOX_OFF(m) (0x40 * (m))
|
|
#define MBOX_MODE_REG(m) (MBOX_OFF(m) + 0x0)
|
|
#define MBOX_DATA_REG(m) (MBOX_OFF(m) + 0x4)
|
|
|
|
#define MBOX_STATE_MASK (0xF << 4)
|
|
#define MBOX_STATE_IDLE (0x1 << 4)
|
|
#define MBOX_STATE_TX (0x2 << 4)
|
|
#define MBOX_STATE_RX (0x4 << 4)
|
|
#define MBOX_STATE_ACK (0x8 << 4)
|
|
#define MBOX_ACK_CONFIG_MASK (0x1 << 0)
|
|
#define MBOX_ACK_AUTOMATIC (0x1 << 0)
|
|
#define MBOX_ACK_IRQ (0x0 << 0)
|
|
|
|
/* IPC registers */
|
|
#define ACK_INT_RAW_REG(i) ((i) + 0x400)
|
|
#define ACK_INT_MSK_REG(i) ((i) + 0x404)
|
|
#define ACK_INT_STAT_REG(i) ((i) + 0x408)
|
|
#define ACK_INT_CLR_REG(i) ((i) + 0x40c)
|
|
#define ACK_INT_ENA_REG(i) ((i) + 0x500)
|
|
#define ACK_INT_DIS_REG(i) ((i) + 0x504)
|
|
#define DST_INT_RAW_REG(i) ((i) + 0x420)
|
|
|
|
|
|
struct hi6220_mbox_chan {
|
|
|
|
/*
|
|
* Description for channel's hardware info:
|
|
* - direction: tx or rx
|
|
* - dst irq: peer core's irq number
|
|
* - ack irq: local irq number
|
|
* - slot number
|
|
*/
|
|
unsigned int dir, dst_irq, ack_irq;
|
|
unsigned int slot;
|
|
|
|
struct hi6220_mbox *parent;
|
|
};
|
|
|
|
struct hi6220_mbox {
|
|
struct device *dev;
|
|
|
|
int irq;
|
|
|
|
/* flag of enabling tx's irq mode */
|
|
bool tx_irq_mode;
|
|
|
|
/* region for ipc event */
|
|
void __iomem *ipc;
|
|
|
|
/* region for mailbox */
|
|
void __iomem *base;
|
|
|
|
unsigned int chan_num;
|
|
struct hi6220_mbox_chan *mchan;
|
|
|
|
void *irq_map_chan[MBOX_CHAN_MAX];
|
|
struct mbox_chan *chan;
|
|
struct mbox_controller controller;
|
|
};
|
|
|
|
static void mbox_set_state(struct hi6220_mbox *mbox,
|
|
unsigned int slot, u32 val)
|
|
{
|
|
u32 status;
|
|
|
|
status = readl(mbox->base + MBOX_MODE_REG(slot));
|
|
status = (status & ~MBOX_STATE_MASK) | val;
|
|
writel(status, mbox->base + MBOX_MODE_REG(slot));
|
|
}
|
|
|
|
static void mbox_set_mode(struct hi6220_mbox *mbox,
|
|
unsigned int slot, u32 val)
|
|
{
|
|
u32 mode;
|
|
|
|
mode = readl(mbox->base + MBOX_MODE_REG(slot));
|
|
mode = (mode & ~MBOX_ACK_CONFIG_MASK) | val;
|
|
writel(mode, mbox->base + MBOX_MODE_REG(slot));
|
|
}
|
|
|
|
static bool hi6220_mbox_last_tx_done(struct mbox_chan *chan)
|
|
{
|
|
struct hi6220_mbox_chan *mchan = chan->con_priv;
|
|
struct hi6220_mbox *mbox = mchan->parent;
|
|
u32 state;
|
|
|
|
/* Only set idle state for polling mode */
|
|
BUG_ON(mbox->tx_irq_mode);
|
|
|
|
state = readl(mbox->base + MBOX_MODE_REG(mchan->slot));
|
|
return ((state & MBOX_STATE_MASK) == MBOX_STATE_IDLE);
|
|
}
|
|
|
|
static int hi6220_mbox_send_data(struct mbox_chan *chan, void *msg)
|
|
{
|
|
struct hi6220_mbox_chan *mchan = chan->con_priv;
|
|
struct hi6220_mbox *mbox = mchan->parent;
|
|
unsigned int slot = mchan->slot;
|
|
u32 *buf = msg;
|
|
int i;
|
|
|
|
/* indicate as a TX channel */
|
|
mchan->dir = MBOX_TX;
|
|
|
|
mbox_set_state(mbox, slot, MBOX_STATE_TX);
|
|
|
|
if (mbox->tx_irq_mode)
|
|
mbox_set_mode(mbox, slot, MBOX_ACK_IRQ);
|
|
else
|
|
mbox_set_mode(mbox, slot, MBOX_ACK_AUTOMATIC);
|
|
|
|
for (i = 0; i < MBOX_MSG_LEN; i++)
|
|
writel(buf[i], mbox->base + MBOX_DATA_REG(slot) + i * 4);
|
|
|
|
/* trigger remote request */
|
|
writel(BIT(mchan->dst_irq), DST_INT_RAW_REG(mbox->ipc));
|
|
return 0;
|
|
}
|
|
|
|
static irqreturn_t hi6220_mbox_interrupt(int irq, void *p)
|
|
{
|
|
struct hi6220_mbox *mbox = p;
|
|
struct hi6220_mbox_chan *mchan;
|
|
struct mbox_chan *chan;
|
|
unsigned int state, intr_bit, i;
|
|
u32 msg[MBOX_MSG_LEN];
|
|
|
|
state = readl(ACK_INT_STAT_REG(mbox->ipc));
|
|
if (!state) {
|
|
dev_warn(mbox->dev, "%s: spurious interrupt\n",
|
|
__func__);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
while (state) {
|
|
intr_bit = __ffs(state);
|
|
state &= (state - 1);
|
|
|
|
chan = mbox->irq_map_chan[intr_bit];
|
|
if (!chan) {
|
|
dev_warn(mbox->dev, "%s: unexpected irq vector %d\n",
|
|
__func__, intr_bit);
|
|
continue;
|
|
}
|
|
|
|
mchan = chan->con_priv;
|
|
if (mchan->dir == MBOX_TX)
|
|
mbox_chan_txdone(chan, 0);
|
|
else {
|
|
for (i = 0; i < MBOX_MSG_LEN; i++)
|
|
msg[i] = readl(mbox->base +
|
|
MBOX_DATA_REG(mchan->slot) + i * 4);
|
|
|
|
mbox_chan_received_data(chan, (void *)msg);
|
|
}
|
|
|
|
/* clear IRQ source */
|
|
writel(BIT(mchan->ack_irq), ACK_INT_CLR_REG(mbox->ipc));
|
|
mbox_set_state(mbox, mchan->slot, MBOX_STATE_IDLE);
|
|
}
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int hi6220_mbox_startup(struct mbox_chan *chan)
|
|
{
|
|
struct hi6220_mbox_chan *mchan = chan->con_priv;
|
|
struct hi6220_mbox *mbox = mchan->parent;
|
|
|
|
mchan->dir = 0;
|
|
|
|
/* enable interrupt */
|
|
writel(BIT(mchan->ack_irq), ACK_INT_ENA_REG(mbox->ipc));
|
|
return 0;
|
|
}
|
|
|
|
static void hi6220_mbox_shutdown(struct mbox_chan *chan)
|
|
{
|
|
struct hi6220_mbox_chan *mchan = chan->con_priv;
|
|
struct hi6220_mbox *mbox = mchan->parent;
|
|
|
|
/* disable interrupt */
|
|
writel(BIT(mchan->ack_irq), ACK_INT_DIS_REG(mbox->ipc));
|
|
mbox->irq_map_chan[mchan->ack_irq] = NULL;
|
|
}
|
|
|
|
static const struct mbox_chan_ops hi6220_mbox_ops = {
|
|
.send_data = hi6220_mbox_send_data,
|
|
.startup = hi6220_mbox_startup,
|
|
.shutdown = hi6220_mbox_shutdown,
|
|
.last_tx_done = hi6220_mbox_last_tx_done,
|
|
};
|
|
|
|
static struct mbox_chan *hi6220_mbox_xlate(struct mbox_controller *controller,
|
|
const struct of_phandle_args *spec)
|
|
{
|
|
struct hi6220_mbox *mbox = dev_get_drvdata(controller->dev);
|
|
struct hi6220_mbox_chan *mchan;
|
|
struct mbox_chan *chan;
|
|
unsigned int i = spec->args[0];
|
|
unsigned int dst_irq = spec->args[1];
|
|
unsigned int ack_irq = spec->args[2];
|
|
|
|
/* Bounds checking */
|
|
if (i >= mbox->chan_num || dst_irq >= mbox->chan_num ||
|
|
ack_irq >= mbox->chan_num) {
|
|
dev_err(mbox->dev,
|
|
"Invalid channel idx %d dst_irq %d ack_irq %d\n",
|
|
i, dst_irq, ack_irq);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
/* Is requested channel free? */
|
|
chan = &mbox->chan[i];
|
|
if (mbox->irq_map_chan[ack_irq] == (void *)chan) {
|
|
dev_err(mbox->dev, "Channel in use\n");
|
|
return ERR_PTR(-EBUSY);
|
|
}
|
|
|
|
mchan = chan->con_priv;
|
|
mchan->dst_irq = dst_irq;
|
|
mchan->ack_irq = ack_irq;
|
|
|
|
mbox->irq_map_chan[ack_irq] = (void *)chan;
|
|
return chan;
|
|
}
|
|
|
|
static const struct of_device_id hi6220_mbox_of_match[] = {
|
|
{ .compatible = "hisilicon,hi6220-mbox", },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, hi6220_mbox_of_match);
|
|
|
|
static int hi6220_mbox_probe(struct platform_device *pdev)
|
|
{
|
|
struct device_node *node = pdev->dev.of_node;
|
|
struct device *dev = &pdev->dev;
|
|
struct hi6220_mbox *mbox;
|
|
struct resource *res;
|
|
int i, err;
|
|
|
|
mbox = devm_kzalloc(dev, sizeof(*mbox), GFP_KERNEL);
|
|
if (!mbox)
|
|
return -ENOMEM;
|
|
|
|
mbox->dev = dev;
|
|
mbox->chan_num = MBOX_CHAN_MAX;
|
|
mbox->mchan = devm_kzalloc(dev,
|
|
mbox->chan_num * sizeof(*mbox->mchan), GFP_KERNEL);
|
|
if (!mbox->mchan)
|
|
return -ENOMEM;
|
|
|
|
mbox->chan = devm_kzalloc(dev,
|
|
mbox->chan_num * sizeof(*mbox->chan), GFP_KERNEL);
|
|
if (!mbox->chan)
|
|
return -ENOMEM;
|
|
|
|
mbox->irq = platform_get_irq(pdev, 0);
|
|
if (mbox->irq < 0)
|
|
return mbox->irq;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
mbox->ipc = devm_ioremap_resource(dev, res);
|
|
if (IS_ERR(mbox->ipc)) {
|
|
dev_err(dev, "ioremap ipc failed\n");
|
|
return PTR_ERR(mbox->ipc);
|
|
}
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
|
|
mbox->base = devm_ioremap_resource(dev, res);
|
|
if (IS_ERR(mbox->base)) {
|
|
dev_err(dev, "ioremap buffer failed\n");
|
|
return PTR_ERR(mbox->base);
|
|
}
|
|
|
|
err = devm_request_irq(dev, mbox->irq, hi6220_mbox_interrupt, 0,
|
|
dev_name(dev), mbox);
|
|
if (err) {
|
|
dev_err(dev, "Failed to register a mailbox IRQ handler: %d\n",
|
|
err);
|
|
return -ENODEV;
|
|
}
|
|
|
|
mbox->controller.dev = dev;
|
|
mbox->controller.chans = &mbox->chan[0];
|
|
mbox->controller.num_chans = mbox->chan_num;
|
|
mbox->controller.ops = &hi6220_mbox_ops;
|
|
mbox->controller.of_xlate = hi6220_mbox_xlate;
|
|
|
|
for (i = 0; i < mbox->chan_num; i++) {
|
|
mbox->chan[i].con_priv = &mbox->mchan[i];
|
|
mbox->irq_map_chan[i] = NULL;
|
|
|
|
mbox->mchan[i].parent = mbox;
|
|
mbox->mchan[i].slot = i;
|
|
}
|
|
|
|
/* mask and clear all interrupt vectors */
|
|
writel(0x0, ACK_INT_MSK_REG(mbox->ipc));
|
|
writel(~0x0, ACK_INT_CLR_REG(mbox->ipc));
|
|
|
|
/* use interrupt for tx's ack */
|
|
if (of_find_property(node, "hi6220,mbox-tx-noirq", NULL))
|
|
mbox->tx_irq_mode = false;
|
|
else
|
|
mbox->tx_irq_mode = true;
|
|
|
|
if (mbox->tx_irq_mode)
|
|
mbox->controller.txdone_irq = true;
|
|
else {
|
|
mbox->controller.txdone_poll = true;
|
|
mbox->controller.txpoll_period = 5;
|
|
}
|
|
|
|
err = mbox_controller_register(&mbox->controller);
|
|
if (err) {
|
|
dev_err(dev, "Failed to register mailbox %d\n", err);
|
|
return err;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, mbox);
|
|
dev_info(dev, "Mailbox enabled\n");
|
|
return 0;
|
|
}
|
|
|
|
static int hi6220_mbox_remove(struct platform_device *pdev)
|
|
{
|
|
struct hi6220_mbox *mbox = platform_get_drvdata(pdev);
|
|
|
|
mbox_controller_unregister(&mbox->controller);
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver hi6220_mbox_driver = {
|
|
.driver = {
|
|
.name = "hi6220-mbox",
|
|
.owner = THIS_MODULE,
|
|
.of_match_table = hi6220_mbox_of_match,
|
|
},
|
|
.probe = hi6220_mbox_probe,
|
|
.remove = hi6220_mbox_remove,
|
|
};
|
|
|
|
static int __init hi6220_mbox_init(void)
|
|
{
|
|
return platform_driver_register(&hi6220_mbox_driver);
|
|
}
|
|
core_initcall(hi6220_mbox_init);
|
|
|
|
static void __exit hi6220_mbox_exit(void)
|
|
{
|
|
platform_driver_unregister(&hi6220_mbox_driver);
|
|
}
|
|
module_exit(hi6220_mbox_exit);
|
|
|
|
MODULE_AUTHOR("Leo Yan <leo.yan@linaro.org>");
|
|
MODULE_DESCRIPTION("Hi6220 mailbox driver");
|
|
MODULE_LICENSE("GPL v2");
|
|
|