linux/drivers/mailbox/omap-mailbox.c
Rob Herring e9803aac50 mailbox: Explicitly include correct DT includes
The DT of_device.h and of_platform.h date back to the separate
of_platform_bus_type before it as merged into the regular platform bus.
As part of that merge prepping Arm DT support 13 years ago, they
"temporarily" include each other. They also include platform_device.h
and of.h. As a result, there's a pretty much random mix of those include
files used throughout the tree. In order to detangle these headers and
replace the implicit includes with struct declarations, users need to
explicitly include the correct includes.

Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2023-09-05 10:10:58 -05:00

919 lines
21 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* OMAP mailbox driver
*
* Copyright (C) 2006-2009 Nokia Corporation. All rights reserved.
* Copyright (C) 2013-2021 Texas Instruments Incorporated - https://www.ti.com
*
* Contact: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
* Suman Anna <s-anna@ti.com>
*/
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/kfifo.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/omap-mailbox.h>
#include <linux/mailbox_controller.h>
#include <linux/mailbox_client.h>
#include "mailbox.h"
#define MAILBOX_REVISION 0x000
#define MAILBOX_MESSAGE(m) (0x040 + 4 * (m))
#define MAILBOX_FIFOSTATUS(m) (0x080 + 4 * (m))
#define MAILBOX_MSGSTATUS(m) (0x0c0 + 4 * (m))
#define OMAP2_MAILBOX_IRQSTATUS(u) (0x100 + 8 * (u))
#define OMAP2_MAILBOX_IRQENABLE(u) (0x104 + 8 * (u))
#define OMAP4_MAILBOX_IRQSTATUS(u) (0x104 + 0x10 * (u))
#define OMAP4_MAILBOX_IRQENABLE(u) (0x108 + 0x10 * (u))
#define OMAP4_MAILBOX_IRQENABLE_CLR(u) (0x10c + 0x10 * (u))
#define MAILBOX_IRQSTATUS(type, u) (type ? OMAP4_MAILBOX_IRQSTATUS(u) : \
OMAP2_MAILBOX_IRQSTATUS(u))
#define MAILBOX_IRQENABLE(type, u) (type ? OMAP4_MAILBOX_IRQENABLE(u) : \
OMAP2_MAILBOX_IRQENABLE(u))
#define MAILBOX_IRQDISABLE(type, u) (type ? OMAP4_MAILBOX_IRQENABLE_CLR(u) \
: OMAP2_MAILBOX_IRQENABLE(u))
#define MAILBOX_IRQ_NEWMSG(m) (1 << (2 * (m)))
#define MAILBOX_IRQ_NOTFULL(m) (1 << (2 * (m) + 1))
/* Interrupt register configuration types */
#define MBOX_INTR_CFG_TYPE1 0
#define MBOX_INTR_CFG_TYPE2 1
struct omap_mbox_fifo {
unsigned long msg;
unsigned long fifo_stat;
unsigned long msg_stat;
unsigned long irqenable;
unsigned long irqstatus;
unsigned long irqdisable;
u32 intr_bit;
};
struct omap_mbox_queue {
spinlock_t lock;
struct kfifo fifo;
struct work_struct work;
struct omap_mbox *mbox;
bool full;
};
struct omap_mbox_match_data {
u32 intr_type;
};
struct omap_mbox_device {
struct device *dev;
struct mutex cfg_lock;
void __iomem *mbox_base;
u32 *irq_ctx;
u32 num_users;
u32 num_fifos;
u32 intr_type;
struct omap_mbox **mboxes;
struct mbox_controller controller;
struct list_head elem;
};
struct omap_mbox_fifo_info {
int tx_id;
int tx_usr;
int tx_irq;
int rx_id;
int rx_usr;
int rx_irq;
const char *name;
bool send_no_irq;
};
struct omap_mbox {
const char *name;
int irq;
struct omap_mbox_queue *rxq;
struct device *dev;
struct omap_mbox_device *parent;
struct omap_mbox_fifo tx_fifo;
struct omap_mbox_fifo rx_fifo;
u32 intr_type;
struct mbox_chan *chan;
bool send_no_irq;
};
/* global variables for the mailbox devices */
static DEFINE_MUTEX(omap_mbox_devices_lock);
static LIST_HEAD(omap_mbox_devices);
static unsigned int mbox_kfifo_size = CONFIG_OMAP_MBOX_KFIFO_SIZE;
module_param(mbox_kfifo_size, uint, S_IRUGO);
MODULE_PARM_DESC(mbox_kfifo_size, "Size of omap's mailbox kfifo (bytes)");
static struct omap_mbox *mbox_chan_to_omap_mbox(struct mbox_chan *chan)
{
if (!chan || !chan->con_priv)
return NULL;
return (struct omap_mbox *)chan->con_priv;
}
static inline
unsigned int mbox_read_reg(struct omap_mbox_device *mdev, size_t ofs)
{
return __raw_readl(mdev->mbox_base + ofs);
}
static inline
void mbox_write_reg(struct omap_mbox_device *mdev, u32 val, size_t ofs)
{
__raw_writel(val, mdev->mbox_base + ofs);
}
/* Mailbox FIFO handle functions */
static u32 mbox_fifo_read(struct omap_mbox *mbox)
{
struct omap_mbox_fifo *fifo = &mbox->rx_fifo;
return mbox_read_reg(mbox->parent, fifo->msg);
}
static void mbox_fifo_write(struct omap_mbox *mbox, u32 msg)
{
struct omap_mbox_fifo *fifo = &mbox->tx_fifo;
mbox_write_reg(mbox->parent, msg, fifo->msg);
}
static int mbox_fifo_empty(struct omap_mbox *mbox)
{
struct omap_mbox_fifo *fifo = &mbox->rx_fifo;
return (mbox_read_reg(mbox->parent, fifo->msg_stat) == 0);
}
static int mbox_fifo_full(struct omap_mbox *mbox)
{
struct omap_mbox_fifo *fifo = &mbox->tx_fifo;
return mbox_read_reg(mbox->parent, fifo->fifo_stat);
}
/* Mailbox IRQ handle functions */
static void ack_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
{
struct omap_mbox_fifo *fifo = (irq == IRQ_TX) ?
&mbox->tx_fifo : &mbox->rx_fifo;
u32 bit = fifo->intr_bit;
u32 irqstatus = fifo->irqstatus;
mbox_write_reg(mbox->parent, bit, irqstatus);
/* Flush posted write for irq status to avoid spurious interrupts */
mbox_read_reg(mbox->parent, irqstatus);
}
static int is_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
{
struct omap_mbox_fifo *fifo = (irq == IRQ_TX) ?
&mbox->tx_fifo : &mbox->rx_fifo;
u32 bit = fifo->intr_bit;
u32 irqenable = fifo->irqenable;
u32 irqstatus = fifo->irqstatus;
u32 enable = mbox_read_reg(mbox->parent, irqenable);
u32 status = mbox_read_reg(mbox->parent, irqstatus);
return (int)(enable & status & bit);
}
static void _omap_mbox_enable_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
{
u32 l;
struct omap_mbox_fifo *fifo = (irq == IRQ_TX) ?
&mbox->tx_fifo : &mbox->rx_fifo;
u32 bit = fifo->intr_bit;
u32 irqenable = fifo->irqenable;
l = mbox_read_reg(mbox->parent, irqenable);
l |= bit;
mbox_write_reg(mbox->parent, l, irqenable);
}
static void _omap_mbox_disable_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
{
struct omap_mbox_fifo *fifo = (irq == IRQ_TX) ?
&mbox->tx_fifo : &mbox->rx_fifo;
u32 bit = fifo->intr_bit;
u32 irqdisable = fifo->irqdisable;
/*
* Read and update the interrupt configuration register for pre-OMAP4.
* OMAP4 and later SoCs have a dedicated interrupt disabling register.
*/
if (!mbox->intr_type)
bit = mbox_read_reg(mbox->parent, irqdisable) & ~bit;
mbox_write_reg(mbox->parent, bit, irqdisable);
}
void omap_mbox_enable_irq(struct mbox_chan *chan, omap_mbox_irq_t irq)
{
struct omap_mbox *mbox = mbox_chan_to_omap_mbox(chan);
if (WARN_ON(!mbox))
return;
_omap_mbox_enable_irq(mbox, irq);
}
EXPORT_SYMBOL(omap_mbox_enable_irq);
void omap_mbox_disable_irq(struct mbox_chan *chan, omap_mbox_irq_t irq)
{
struct omap_mbox *mbox = mbox_chan_to_omap_mbox(chan);
if (WARN_ON(!mbox))
return;
_omap_mbox_disable_irq(mbox, irq);
}
EXPORT_SYMBOL(omap_mbox_disable_irq);
/*
* Message receiver(workqueue)
*/
static void mbox_rx_work(struct work_struct *work)
{
struct omap_mbox_queue *mq =
container_of(work, struct omap_mbox_queue, work);
mbox_msg_t data;
u32 msg;
int len;
while (kfifo_len(&mq->fifo) >= sizeof(msg)) {
len = kfifo_out(&mq->fifo, (unsigned char *)&msg, sizeof(msg));
WARN_ON(len != sizeof(msg));
data = msg;
mbox_chan_received_data(mq->mbox->chan, (void *)data);
spin_lock_irq(&mq->lock);
if (mq->full) {
mq->full = false;
_omap_mbox_enable_irq(mq->mbox, IRQ_RX);
}
spin_unlock_irq(&mq->lock);
}
}
/*
* Mailbox interrupt handler
*/
static void __mbox_tx_interrupt(struct omap_mbox *mbox)
{
_omap_mbox_disable_irq(mbox, IRQ_TX);
ack_mbox_irq(mbox, IRQ_TX);
mbox_chan_txdone(mbox->chan, 0);
}
static void __mbox_rx_interrupt(struct omap_mbox *mbox)
{
struct omap_mbox_queue *mq = mbox->rxq;
u32 msg;
int len;
while (!mbox_fifo_empty(mbox)) {
if (unlikely(kfifo_avail(&mq->fifo) < sizeof(msg))) {
_omap_mbox_disable_irq(mbox, IRQ_RX);
mq->full = true;
goto nomem;
}
msg = mbox_fifo_read(mbox);
len = kfifo_in(&mq->fifo, (unsigned char *)&msg, sizeof(msg));
WARN_ON(len != sizeof(msg));
}
/* no more messages in the fifo. clear IRQ source. */
ack_mbox_irq(mbox, IRQ_RX);
nomem:
schedule_work(&mbox->rxq->work);
}
static irqreturn_t mbox_interrupt(int irq, void *p)
{
struct omap_mbox *mbox = p;
if (is_mbox_irq(mbox, IRQ_TX))
__mbox_tx_interrupt(mbox);
if (is_mbox_irq(mbox, IRQ_RX))
__mbox_rx_interrupt(mbox);
return IRQ_HANDLED;
}
static struct omap_mbox_queue *mbox_queue_alloc(struct omap_mbox *mbox,
void (*work)(struct work_struct *))
{
struct omap_mbox_queue *mq;
if (!work)
return NULL;
mq = kzalloc(sizeof(*mq), GFP_KERNEL);
if (!mq)
return NULL;
spin_lock_init(&mq->lock);
if (kfifo_alloc(&mq->fifo, mbox_kfifo_size, GFP_KERNEL))
goto error;
INIT_WORK(&mq->work, work);
return mq;
error:
kfree(mq);
return NULL;
}
static void mbox_queue_free(struct omap_mbox_queue *q)
{
kfifo_free(&q->fifo);
kfree(q);
}
static int omap_mbox_startup(struct omap_mbox *mbox)
{
int ret = 0;
struct omap_mbox_queue *mq;
mq = mbox_queue_alloc(mbox, mbox_rx_work);
if (!mq)
return -ENOMEM;
mbox->rxq = mq;
mq->mbox = mbox;
ret = request_irq(mbox->irq, mbox_interrupt, IRQF_SHARED,
mbox->name, mbox);
if (unlikely(ret)) {
pr_err("failed to register mailbox interrupt:%d\n", ret);
goto fail_request_irq;
}
if (mbox->send_no_irq)
mbox->chan->txdone_method = TXDONE_BY_ACK;
_omap_mbox_enable_irq(mbox, IRQ_RX);
return 0;
fail_request_irq:
mbox_queue_free(mbox->rxq);
return ret;
}
static void omap_mbox_fini(struct omap_mbox *mbox)
{
_omap_mbox_disable_irq(mbox, IRQ_RX);
free_irq(mbox->irq, mbox);
flush_work(&mbox->rxq->work);
mbox_queue_free(mbox->rxq);
}
static struct omap_mbox *omap_mbox_device_find(struct omap_mbox_device *mdev,
const char *mbox_name)
{
struct omap_mbox *_mbox, *mbox = NULL;
struct omap_mbox **mboxes = mdev->mboxes;
int i;
if (!mboxes)
return NULL;
for (i = 0; (_mbox = mboxes[i]); i++) {
if (!strcmp(_mbox->name, mbox_name)) {
mbox = _mbox;
break;
}
}
return mbox;
}
struct mbox_chan *omap_mbox_request_channel(struct mbox_client *cl,
const char *chan_name)
{
struct device *dev = cl->dev;
struct omap_mbox *mbox = NULL;
struct omap_mbox_device *mdev;
int ret;
if (!dev)
return ERR_PTR(-ENODEV);
if (dev->of_node) {
pr_err("%s: please use mbox_request_channel(), this API is supported only for OMAP non-DT usage\n",
__func__);
return ERR_PTR(-ENODEV);
}
mutex_lock(&omap_mbox_devices_lock);
list_for_each_entry(mdev, &omap_mbox_devices, elem) {
mbox = omap_mbox_device_find(mdev, chan_name);
if (mbox)
break;
}
mutex_unlock(&omap_mbox_devices_lock);
if (!mbox || !mbox->chan)
return ERR_PTR(-ENOENT);
ret = mbox_bind_client(mbox->chan, cl);
if (ret)
return ERR_PTR(ret);
return mbox->chan;
}
EXPORT_SYMBOL(omap_mbox_request_channel);
static struct class omap_mbox_class = { .name = "mbox", };
static int omap_mbox_register(struct omap_mbox_device *mdev)
{
int ret;
int i;
struct omap_mbox **mboxes;
if (!mdev || !mdev->mboxes)
return -EINVAL;
mboxes = mdev->mboxes;
for (i = 0; mboxes[i]; i++) {
struct omap_mbox *mbox = mboxes[i];
mbox->dev = device_create(&omap_mbox_class, mdev->dev,
0, mbox, "%s", mbox->name);
if (IS_ERR(mbox->dev)) {
ret = PTR_ERR(mbox->dev);
goto err_out;
}
}
mutex_lock(&omap_mbox_devices_lock);
list_add(&mdev->elem, &omap_mbox_devices);
mutex_unlock(&omap_mbox_devices_lock);
ret = devm_mbox_controller_register(mdev->dev, &mdev->controller);
err_out:
if (ret) {
while (i--)
device_unregister(mboxes[i]->dev);
}
return ret;
}
static int omap_mbox_unregister(struct omap_mbox_device *mdev)
{
int i;
struct omap_mbox **mboxes;
if (!mdev || !mdev->mboxes)
return -EINVAL;
mutex_lock(&omap_mbox_devices_lock);
list_del(&mdev->elem);
mutex_unlock(&omap_mbox_devices_lock);
mboxes = mdev->mboxes;
for (i = 0; mboxes[i]; i++)
device_unregister(mboxes[i]->dev);
return 0;
}
static int omap_mbox_chan_startup(struct mbox_chan *chan)
{
struct omap_mbox *mbox = mbox_chan_to_omap_mbox(chan);
struct omap_mbox_device *mdev = mbox->parent;
int ret = 0;
mutex_lock(&mdev->cfg_lock);
pm_runtime_get_sync(mdev->dev);
ret = omap_mbox_startup(mbox);
if (ret)
pm_runtime_put_sync(mdev->dev);
mutex_unlock(&mdev->cfg_lock);
return ret;
}
static void omap_mbox_chan_shutdown(struct mbox_chan *chan)
{
struct omap_mbox *mbox = mbox_chan_to_omap_mbox(chan);
struct omap_mbox_device *mdev = mbox->parent;
mutex_lock(&mdev->cfg_lock);
omap_mbox_fini(mbox);
pm_runtime_put_sync(mdev->dev);
mutex_unlock(&mdev->cfg_lock);
}
static int omap_mbox_chan_send_noirq(struct omap_mbox *mbox, u32 msg)
{
int ret = -EBUSY;
if (!mbox_fifo_full(mbox)) {
_omap_mbox_enable_irq(mbox, IRQ_RX);
mbox_fifo_write(mbox, msg);
ret = 0;
_omap_mbox_disable_irq(mbox, IRQ_RX);
/* we must read and ack the interrupt directly from here */
mbox_fifo_read(mbox);
ack_mbox_irq(mbox, IRQ_RX);
}
return ret;
}
static int omap_mbox_chan_send(struct omap_mbox *mbox, u32 msg)
{
int ret = -EBUSY;
if (!mbox_fifo_full(mbox)) {
mbox_fifo_write(mbox, msg);
ret = 0;
}
/* always enable the interrupt */
_omap_mbox_enable_irq(mbox, IRQ_TX);
return ret;
}
static int omap_mbox_chan_send_data(struct mbox_chan *chan, void *data)
{
struct omap_mbox *mbox = mbox_chan_to_omap_mbox(chan);
int ret;
u32 msg = omap_mbox_message(data);
if (!mbox)
return -EINVAL;
if (mbox->send_no_irq)
ret = omap_mbox_chan_send_noirq(mbox, msg);
else
ret = omap_mbox_chan_send(mbox, msg);
return ret;
}
static const struct mbox_chan_ops omap_mbox_chan_ops = {
.startup = omap_mbox_chan_startup,
.send_data = omap_mbox_chan_send_data,
.shutdown = omap_mbox_chan_shutdown,
};
#ifdef CONFIG_PM_SLEEP
static int omap_mbox_suspend(struct device *dev)
{
struct omap_mbox_device *mdev = dev_get_drvdata(dev);
u32 usr, fifo, reg;
if (pm_runtime_status_suspended(dev))
return 0;
for (fifo = 0; fifo < mdev->num_fifos; fifo++) {
if (mbox_read_reg(mdev, MAILBOX_MSGSTATUS(fifo))) {
dev_err(mdev->dev, "fifo %d has unexpected unread messages\n",
fifo);
return -EBUSY;
}
}
for (usr = 0; usr < mdev->num_users; usr++) {
reg = MAILBOX_IRQENABLE(mdev->intr_type, usr);
mdev->irq_ctx[usr] = mbox_read_reg(mdev, reg);
}
return 0;
}
static int omap_mbox_resume(struct device *dev)
{
struct omap_mbox_device *mdev = dev_get_drvdata(dev);
u32 usr, reg;
if (pm_runtime_status_suspended(dev))
return 0;
for (usr = 0; usr < mdev->num_users; usr++) {
reg = MAILBOX_IRQENABLE(mdev->intr_type, usr);
mbox_write_reg(mdev, mdev->irq_ctx[usr], reg);
}
return 0;
}
#endif
static const struct dev_pm_ops omap_mbox_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(omap_mbox_suspend, omap_mbox_resume)
};
static const struct omap_mbox_match_data omap2_data = { MBOX_INTR_CFG_TYPE1 };
static const struct omap_mbox_match_data omap4_data = { MBOX_INTR_CFG_TYPE2 };
static const struct of_device_id omap_mailbox_of_match[] = {
{
.compatible = "ti,omap2-mailbox",
.data = &omap2_data,
},
{
.compatible = "ti,omap3-mailbox",
.data = &omap2_data,
},
{
.compatible = "ti,omap4-mailbox",
.data = &omap4_data,
},
{
.compatible = "ti,am654-mailbox",
.data = &omap4_data,
},
{
.compatible = "ti,am64-mailbox",
.data = &omap4_data,
},
{
/* end */
},
};
MODULE_DEVICE_TABLE(of, omap_mailbox_of_match);
static struct mbox_chan *omap_mbox_of_xlate(struct mbox_controller *controller,
const struct of_phandle_args *sp)
{
phandle phandle = sp->args[0];
struct device_node *node;
struct omap_mbox_device *mdev;
struct omap_mbox *mbox;
mdev = container_of(controller, struct omap_mbox_device, controller);
if (WARN_ON(!mdev))
return ERR_PTR(-EINVAL);
node = of_find_node_by_phandle(phandle);
if (!node) {
pr_err("%s: could not find node phandle 0x%x\n",
__func__, phandle);
return ERR_PTR(-ENODEV);
}
mbox = omap_mbox_device_find(mdev, node->name);
of_node_put(node);
return mbox ? mbox->chan : ERR_PTR(-ENOENT);
}
static int omap_mbox_probe(struct platform_device *pdev)
{
int ret;
struct mbox_chan *chnls;
struct omap_mbox **list, *mbox, *mboxblk;
struct omap_mbox_fifo_info *finfo, *finfoblk;
struct omap_mbox_device *mdev;
struct omap_mbox_fifo *fifo;
struct device_node *node = pdev->dev.of_node;
struct device_node *child;
const struct omap_mbox_match_data *match_data;
u32 intr_type, info_count;
u32 num_users, num_fifos;
u32 tmp[3];
u32 l;
int i;
if (!node) {
pr_err("%s: only DT-based devices are supported\n", __func__);
return -ENODEV;
}
match_data = of_device_get_match_data(&pdev->dev);
if (!match_data)
return -ENODEV;
intr_type = match_data->intr_type;
if (of_property_read_u32(node, "ti,mbox-num-users", &num_users))
return -ENODEV;
if (of_property_read_u32(node, "ti,mbox-num-fifos", &num_fifos))
return -ENODEV;
info_count = of_get_available_child_count(node);
if (!info_count) {
dev_err(&pdev->dev, "no available mbox devices found\n");
return -ENODEV;
}
finfoblk = devm_kcalloc(&pdev->dev, info_count, sizeof(*finfoblk),
GFP_KERNEL);
if (!finfoblk)
return -ENOMEM;
finfo = finfoblk;
child = NULL;
for (i = 0; i < info_count; i++, finfo++) {
child = of_get_next_available_child(node, child);
ret = of_property_read_u32_array(child, "ti,mbox-tx", tmp,
ARRAY_SIZE(tmp));
if (ret)
return ret;
finfo->tx_id = tmp[0];
finfo->tx_irq = tmp[1];
finfo->tx_usr = tmp[2];
ret = of_property_read_u32_array(child, "ti,mbox-rx", tmp,
ARRAY_SIZE(tmp));
if (ret)
return ret;
finfo->rx_id = tmp[0];
finfo->rx_irq = tmp[1];
finfo->rx_usr = tmp[2];
finfo->name = child->name;
finfo->send_no_irq = of_property_read_bool(child, "ti,mbox-send-noirq");
if (finfo->tx_id >= num_fifos || finfo->rx_id >= num_fifos ||
finfo->tx_usr >= num_users || finfo->rx_usr >= num_users)
return -EINVAL;
}
mdev = devm_kzalloc(&pdev->dev, sizeof(*mdev), GFP_KERNEL);
if (!mdev)
return -ENOMEM;
mdev->mbox_base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(mdev->mbox_base))
return PTR_ERR(mdev->mbox_base);
mdev->irq_ctx = devm_kcalloc(&pdev->dev, num_users, sizeof(u32),
GFP_KERNEL);
if (!mdev->irq_ctx)
return -ENOMEM;
/* allocate one extra for marking end of list */
list = devm_kcalloc(&pdev->dev, info_count + 1, sizeof(*list),
GFP_KERNEL);
if (!list)
return -ENOMEM;
chnls = devm_kcalloc(&pdev->dev, info_count + 1, sizeof(*chnls),
GFP_KERNEL);
if (!chnls)
return -ENOMEM;
mboxblk = devm_kcalloc(&pdev->dev, info_count, sizeof(*mbox),
GFP_KERNEL);
if (!mboxblk)
return -ENOMEM;
mbox = mboxblk;
finfo = finfoblk;
for (i = 0; i < info_count; i++, finfo++) {
fifo = &mbox->tx_fifo;
fifo->msg = MAILBOX_MESSAGE(finfo->tx_id);
fifo->fifo_stat = MAILBOX_FIFOSTATUS(finfo->tx_id);
fifo->intr_bit = MAILBOX_IRQ_NOTFULL(finfo->tx_id);
fifo->irqenable = MAILBOX_IRQENABLE(intr_type, finfo->tx_usr);
fifo->irqstatus = MAILBOX_IRQSTATUS(intr_type, finfo->tx_usr);
fifo->irqdisable = MAILBOX_IRQDISABLE(intr_type, finfo->tx_usr);
fifo = &mbox->rx_fifo;
fifo->msg = MAILBOX_MESSAGE(finfo->rx_id);
fifo->msg_stat = MAILBOX_MSGSTATUS(finfo->rx_id);
fifo->intr_bit = MAILBOX_IRQ_NEWMSG(finfo->rx_id);
fifo->irqenable = MAILBOX_IRQENABLE(intr_type, finfo->rx_usr);
fifo->irqstatus = MAILBOX_IRQSTATUS(intr_type, finfo->rx_usr);
fifo->irqdisable = MAILBOX_IRQDISABLE(intr_type, finfo->rx_usr);
mbox->send_no_irq = finfo->send_no_irq;
mbox->intr_type = intr_type;
mbox->parent = mdev;
mbox->name = finfo->name;
mbox->irq = platform_get_irq(pdev, finfo->tx_irq);
if (mbox->irq < 0)
return mbox->irq;
mbox->chan = &chnls[i];
chnls[i].con_priv = mbox;
list[i] = mbox++;
}
mutex_init(&mdev->cfg_lock);
mdev->dev = &pdev->dev;
mdev->num_users = num_users;
mdev->num_fifos = num_fifos;
mdev->intr_type = intr_type;
mdev->mboxes = list;
/*
* OMAP/K3 Mailbox IP does not have a Tx-Done IRQ, but rather a Tx-Ready
* IRQ and is needed to run the Tx state machine
*/
mdev->controller.txdone_irq = true;
mdev->controller.dev = mdev->dev;
mdev->controller.ops = &omap_mbox_chan_ops;
mdev->controller.chans = chnls;
mdev->controller.num_chans = info_count;
mdev->controller.of_xlate = omap_mbox_of_xlate;
ret = omap_mbox_register(mdev);
if (ret)
return ret;
platform_set_drvdata(pdev, mdev);
pm_runtime_enable(mdev->dev);
ret = pm_runtime_resume_and_get(mdev->dev);
if (ret < 0)
goto unregister;
/*
* just print the raw revision register, the format is not
* uniform across all SoCs
*/
l = mbox_read_reg(mdev, MAILBOX_REVISION);
dev_info(mdev->dev, "omap mailbox rev 0x%x\n", l);
ret = pm_runtime_put_sync(mdev->dev);
if (ret < 0 && ret != -ENOSYS)
goto unregister;
devm_kfree(&pdev->dev, finfoblk);
return 0;
unregister:
pm_runtime_disable(mdev->dev);
omap_mbox_unregister(mdev);
return ret;
}
static int omap_mbox_remove(struct platform_device *pdev)
{
struct omap_mbox_device *mdev = platform_get_drvdata(pdev);
pm_runtime_disable(mdev->dev);
omap_mbox_unregister(mdev);
return 0;
}
static struct platform_driver omap_mbox_driver = {
.probe = omap_mbox_probe,
.remove = omap_mbox_remove,
.driver = {
.name = "omap-mailbox",
.pm = &omap_mbox_pm_ops,
.of_match_table = of_match_ptr(omap_mailbox_of_match),
},
};
static int __init omap_mbox_init(void)
{
int err;
err = class_register(&omap_mbox_class);
if (err)
return err;
/* kfifo size sanity check: alignment and minimal size */
mbox_kfifo_size = ALIGN(mbox_kfifo_size, sizeof(u32));
mbox_kfifo_size = max_t(unsigned int, mbox_kfifo_size, sizeof(u32));
err = platform_driver_register(&omap_mbox_driver);
if (err)
class_unregister(&omap_mbox_class);
return err;
}
subsys_initcall(omap_mbox_init);
static void __exit omap_mbox_exit(void)
{
platform_driver_unregister(&omap_mbox_driver);
class_unregister(&omap_mbox_class);
}
module_exit(omap_mbox_exit);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("omap mailbox: interrupt driven messaging");
MODULE_AUTHOR("Toshihiro Kobayashi");
MODULE_AUTHOR("Hiroshi DOYU");