Revision 9d514262425691dddf942edea8bc9919e66fe140 authored by Wanpeng Li on 13 May 2015, 06:01:03 UTC, committed by Ingo Molnar on 19 June 2015, 08:06:46 UTC
This patch adds a check that prevents futile attempts to move DL tasks to a CPU with active tasks of equal or earlier deadline. The same behavior as commit 80e3d87b2c55 ("sched/rt: Reduce rq lock contention by eliminating locking of non-feasible target") for rt class. Signed-off-by: Wanpeng Li <wanpeng.li@linux.intel.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Borislav Petkov <bp@alien8.de> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Juri Lelli <juri.lelli@arm.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1431496867-4194-3-git-send-email-wanpeng.li@linux.intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
1 parent a6c0e74
omap-mailbox.c
/*
* OMAP mailbox driver
*
* Copyright (C) 2006-2009 Nokia Corporation. All rights reserved.
* Copyright (C) 2013-2014 Texas Instruments Inc.
*
* Contact: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
* Suman Anna <s-anna@ti.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
*/
#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_device.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/platform_data/mailbox-omap.h>
#include <linux/omap-mailbox.h>
#include <linux/mailbox_controller.h>
#include <linux/mailbox_client.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))
#define MBOX_REG_SIZE 0x120
#define OMAP4_MBOX_REG_SIZE 0x130
#define MBOX_NR_REGS (MBOX_REG_SIZE / sizeof(u32))
#define OMAP4_MBOX_NR_REGS (OMAP4_MBOX_REG_SIZE / sizeof(u32))
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_device {
struct device *dev;
struct mutex cfg_lock;
void __iomem *mbox_base;
u32 num_users;
u32 num_fifos;
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;
};
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 ctx[OMAP4_MBOX_NR_REGS];
u32 intr_type;
struct mbox_chan *chan;
};
/* 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 mbox_msg_t mbox_fifo_read(struct omap_mbox *mbox)
{
struct omap_mbox_fifo *fifo = &mbox->rx_fifo;
return (mbox_msg_t) mbox_read_reg(mbox->parent, fifo->msg);
}
static void mbox_fifo_write(struct omap_mbox *mbox, mbox_msg_t 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);
}
void omap_mbox_save_ctx(struct mbox_chan *chan)
{
int i;
int nr_regs;
struct omap_mbox *mbox = mbox_chan_to_omap_mbox(chan);
if (WARN_ON(!mbox))
return;
if (mbox->intr_type)
nr_regs = OMAP4_MBOX_NR_REGS;
else
nr_regs = MBOX_NR_REGS;
for (i = 0; i < nr_regs; i++) {
mbox->ctx[i] = mbox_read_reg(mbox->parent, i * sizeof(u32));
dev_dbg(mbox->dev, "%s: [%02x] %08x\n", __func__,
i, mbox->ctx[i]);
}
}
EXPORT_SYMBOL(omap_mbox_save_ctx);
void omap_mbox_restore_ctx(struct mbox_chan *chan)
{
int i;
int nr_regs;
struct omap_mbox *mbox = mbox_chan_to_omap_mbox(chan);
if (WARN_ON(!mbox))
return;
if (mbox->intr_type)
nr_regs = OMAP4_MBOX_NR_REGS;
else
nr_regs = MBOX_NR_REGS;
for (i = 0; i < nr_regs; i++) {
mbox_write_reg(mbox->parent, mbox->ctx[i], i * sizeof(u32));
dev_dbg(mbox->dev, "%s: [%02x] %08x\n", __func__,
i, mbox->ctx[i]);
}
}
EXPORT_SYMBOL(omap_mbox_restore_ctx);
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 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));
mbox_chan_received_data(mq->mbox->chan, (void *)msg);
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;
mbox_msg_t 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(struct omap_mbox_queue), 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;
}
_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;
struct mbox_chan *chan;
unsigned long flags;
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);
chan = mbox->chan;
spin_lock_irqsave(&chan->lock, flags);
chan->msg_free = 0;
chan->msg_count = 0;
chan->active_req = NULL;
chan->cl = cl;
init_completion(&chan->tx_complete);
spin_unlock_irqrestore(&chan->lock, flags);
ret = chan->mbox->ops->startup(chan);
if (ret) {
pr_err("Unable to startup the chan (%d)\n", ret);
mbox_free_channel(chan);
chan = ERR_PTR(ret);
}
return 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 = mbox_controller_register(&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);
mbox_controller_unregister(&mdev->controller);
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_data(struct mbox_chan *chan, void *data)
{
struct omap_mbox *mbox = mbox_chan_to_omap_mbox(chan);
int ret = -EBUSY;
if (!mbox)
return -EINVAL;
if (!mbox_fifo_full(mbox)) {
mbox_fifo_write(mbox, (mbox_msg_t)data);
ret = 0;
}
/* always enable the interrupt */
_omap_mbox_enable_irq(mbox, IRQ_TX);
return ret;
}
static 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,
};
static const struct of_device_id omap_mailbox_of_match[] = {
{
.compatible = "ti,omap2-mailbox",
.data = (void *)MBOX_INTR_CFG_TYPE1,
},
{
.compatible = "ti,omap3-mailbox",
.data = (void *)MBOX_INTR_CFG_TYPE1,
},
{
.compatible = "ti,omap4-mailbox",
.data = (void *)MBOX_INTR_CFG_TYPE2,
},
{
/* 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 NULL;
node = of_find_node_by_phandle(phandle);
if (!node) {
pr_err("%s: could not find node phandle 0x%x\n",
__func__, phandle);
return NULL;
}
mbox = omap_mbox_device_find(mdev, node->name);
of_node_put(node);
return mbox ? mbox->chan : NULL;
}
static int omap_mbox_probe(struct platform_device *pdev)
{
struct resource *mem;
int ret;
struct mbox_chan *chnls;
struct omap_mbox **list, *mbox, *mboxblk;
struct omap_mbox_pdata *pdata = pdev->dev.platform_data;
struct omap_mbox_dev_info *info = NULL;
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 of_device_id *match;
u32 intr_type, info_count;
u32 num_users, num_fifos;
u32 tmp[3];
u32 l;
int i;
if (!node && (!pdata || !pdata->info_cnt || !pdata->info)) {
pr_err("%s: platform not supported\n", __func__);
return -ENODEV;
}
if (node) {
match = of_match_device(omap_mailbox_of_match, &pdev->dev);
if (!match)
return -ENODEV;
intr_type = (u32)match->data;
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;
}
} else { /* non-DT device creation */
info_count = pdata->info_cnt;
info = pdata->info;
intr_type = pdata->intr_type;
num_users = pdata->num_users;
num_fifos = pdata->num_fifos;
}
finfoblk = devm_kzalloc(&pdev->dev, info_count * sizeof(*finfoblk),
GFP_KERNEL);
if (!finfoblk)
return -ENOMEM;
finfo = finfoblk;
child = NULL;
for (i = 0; i < info_count; i++, finfo++) {
if (node) {
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;
} else {
finfo->tx_id = info->tx_id;
finfo->rx_id = info->rx_id;
finfo->tx_usr = info->usr_id;
finfo->tx_irq = info->irq_id;
finfo->rx_usr = info->usr_id;
finfo->rx_irq = info->irq_id;
finfo->name = info->name;
info++;
}
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;
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
mdev->mbox_base = devm_ioremap_resource(&pdev->dev, mem);
if (IS_ERR(mdev->mbox_base))
return PTR_ERR(mdev->mbox_base);
/* allocate one extra for marking end of list */
list = devm_kzalloc(&pdev->dev, (info_count + 1) * sizeof(*list),
GFP_KERNEL);
if (!list)
return -ENOMEM;
chnls = devm_kzalloc(&pdev->dev, (info_count + 1) * sizeof(*chnls),
GFP_KERNEL);
if (!chnls)
return -ENOMEM;
mboxblk = devm_kzalloc(&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->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->mboxes = list;
/* OMAP does not have a Tx-Done IRQ, but rather a Tx-Ready IRQ */
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_get_sync(mdev->dev);
if (ret < 0) {
pm_runtime_put_noidle(mdev->dev);
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)
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",
.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(mbox_msg_t));
mbox_kfifo_size = max_t(unsigned int, mbox_kfifo_size,
sizeof(mbox_msg_t));
return platform_driver_register(&omap_mbox_driver);
}
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");
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