#include <linux/slab.h>
#include <linux/kfifo.h>
#include <linux/err.h>
-#include <linux/notifier.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))
spinlock_t lock;
struct kfifo fifo;
struct work_struct work;
- struct tasklet_struct tasklet;
struct omap_mbox *mbox;
bool full;
};
u32 num_users;
u32 num_fifos;
struct omap_mbox **mboxes;
+ struct mbox_controller controller;
struct list_head elem;
};
struct omap_mbox {
const char *name;
int irq;
- struct omap_mbox_queue *txq, *rxq;
+ 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;
- int use_count;
- struct blocking_notifier_head notifier;
+ struct mbox_chan *chan;
};
/* global variables for the mailbox devices */
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 (int)(enable & status & bit);
}
-/*
- * message sender
- */
-int omap_mbox_msg_send(struct omap_mbox *mbox, mbox_msg_t msg)
-{
- struct omap_mbox_queue *mq = mbox->txq;
- int ret = 0, len;
-
- spin_lock_bh(&mq->lock);
-
- if (kfifo_avail(&mq->fifo) < sizeof(msg)) {
- ret = -ENOMEM;
- goto out;
- }
-
- if (kfifo_is_empty(&mq->fifo) && !mbox_fifo_full(mbox)) {
- mbox_fifo_write(mbox, msg);
- goto out;
- }
-
- len = kfifo_in(&mq->fifo, (unsigned char *)&msg, sizeof(msg));
- WARN_ON(len != sizeof(msg));
-
- tasklet_schedule(&mbox->txq->tasklet);
-
-out:
- spin_unlock_bh(&mq->lock);
- return ret;
-}
-EXPORT_SYMBOL(omap_mbox_msg_send);
-
-void omap_mbox_save_ctx(struct omap_mbox *mbox)
+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;
}
EXPORT_SYMBOL(omap_mbox_save_ctx);
-void omap_mbox_restore_ctx(struct omap_mbox *mbox)
+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;
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);
-void omap_mbox_enable_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
+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) ?
l |= bit;
mbox_write_reg(mbox->parent, l, irqenable);
}
-EXPORT_SYMBOL(omap_mbox_enable_irq);
-void omap_mbox_disable_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
+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;
mbox_write_reg(mbox->parent, bit, irqdisable);
}
-EXPORT_SYMBOL(omap_mbox_disable_irq);
-static void mbox_tx_tasklet(unsigned long tx_data)
+void omap_mbox_enable_irq(struct mbox_chan *chan, omap_mbox_irq_t irq)
{
- struct omap_mbox *mbox = (struct omap_mbox *)tx_data;
- struct omap_mbox_queue *mq = mbox->txq;
- mbox_msg_t msg;
- int ret;
+ struct omap_mbox *mbox = mbox_chan_to_omap_mbox(chan);
- while (kfifo_len(&mq->fifo)) {
- if (mbox_fifo_full(mbox)) {
- omap_mbox_enable_irq(mbox, IRQ_TX);
- break;
- }
+ if (WARN_ON(!mbox))
+ return;
- ret = kfifo_out(&mq->fifo, (unsigned char *)&msg,
- sizeof(msg));
- WARN_ON(ret != sizeof(msg));
+ _omap_mbox_enable_irq(mbox, irq);
+}
+EXPORT_SYMBOL(omap_mbox_enable_irq);
- mbox_fifo_write(mbox, msg);
- }
+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)
len = kfifo_out(&mq->fifo, (unsigned char *)&msg, sizeof(msg));
WARN_ON(len != sizeof(msg));
- blocking_notifier_call_chain(&mq->mbox->notifier, len,
- (void *)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);
+ _omap_mbox_enable_irq(mq->mbox, IRQ_RX);
}
spin_unlock_irq(&mq->lock);
}
*/
static void __mbox_tx_interrupt(struct omap_mbox *mbox)
{
- omap_mbox_disable_irq(mbox, IRQ_TX);
+ _omap_mbox_disable_irq(mbox, IRQ_TX);
ack_mbox_irq(mbox, IRQ_TX);
- tasklet_schedule(&mbox->txq->tasklet);
+ mbox_chan_txdone(mbox->chan, 0);
}
static void __mbox_rx_interrupt(struct omap_mbox *mbox)
while (!mbox_fifo_empty(mbox)) {
if (unlikely(kfifo_avail(&mq->fifo) < sizeof(msg))) {
- omap_mbox_disable_irq(mbox, IRQ_RX);
+ _omap_mbox_disable_irq(mbox, IRQ_RX);
mq->full = true;
goto nomem;
}
}
static struct omap_mbox_queue *mbox_queue_alloc(struct omap_mbox *mbox,
- void (*work) (struct work_struct *),
- void (*tasklet)(unsigned long))
+ 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;
if (kfifo_alloc(&mq->fifo, mbox_kfifo_size, GFP_KERNEL))
goto error;
- if (work)
- INIT_WORK(&mq->work, work);
-
- if (tasklet)
- tasklet_init(&mq->tasklet, tasklet, (unsigned long)mbox);
+ INIT_WORK(&mq->work, work);
return mq;
+
error:
kfree(mq);
return NULL;
{
int ret = 0;
struct omap_mbox_queue *mq;
- struct omap_mbox_device *mdev = mbox->parent;
- mutex_lock(&mdev->cfg_lock);
- ret = pm_runtime_get_sync(mdev->dev);
- if (unlikely(ret < 0))
- goto fail_startup;
-
- if (!mbox->use_count++) {
- mq = mbox_queue_alloc(mbox, NULL, mbox_tx_tasklet);
- if (!mq) {
- ret = -ENOMEM;
- goto fail_alloc_txq;
- }
- mbox->txq = 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;
+ }
- mq = mbox_queue_alloc(mbox, mbox_rx_work, NULL);
- if (!mq) {
- ret = -ENOMEM;
- goto fail_alloc_rxq;
- }
- 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);
- omap_mbox_enable_irq(mbox, IRQ_RX);
- }
- mutex_unlock(&mdev->cfg_lock);
return 0;
fail_request_irq:
mbox_queue_free(mbox->rxq);
-fail_alloc_rxq:
- mbox_queue_free(mbox->txq);
-fail_alloc_txq:
- pm_runtime_put_sync(mdev->dev);
- mbox->use_count--;
-fail_startup:
- mutex_unlock(&mdev->cfg_lock);
return ret;
}
static void omap_mbox_fini(struct omap_mbox *mbox)
{
- struct omap_mbox_device *mdev = mbox->parent;
-
- mutex_lock(&mdev->cfg_lock);
-
- if (!--mbox->use_count) {
- omap_mbox_disable_irq(mbox, IRQ_RX);
- free_irq(mbox->irq, mbox);
- tasklet_kill(&mbox->txq->tasklet);
- flush_work(&mbox->rxq->work);
- mbox_queue_free(mbox->txq);
- mbox_queue_free(mbox->rxq);
- }
-
- pm_runtime_put_sync(mdev->dev);
-
- mutex_unlock(&mdev->cfg_lock);
+ _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,
return mbox;
}
-struct omap_mbox *omap_mbox_get(const char *name, struct notifier_block *nb)
+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, name);
+ mbox = omap_mbox_device_find(mdev, chan_name);
if (mbox)
break;
}
mutex_unlock(&omap_mbox_devices_lock);
- if (!mbox)
+ if (!mbox || !mbox->chan)
return ERR_PTR(-ENOENT);
- if (nb)
- blocking_notifier_chain_register(&mbox->notifier, nb);
+ 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 = omap_mbox_startup(mbox);
+ ret = chan->mbox->ops->startup(chan);
if (ret) {
- blocking_notifier_chain_unregister(&mbox->notifier, nb);
- return ERR_PTR(-ENODEV);
+ pr_err("Unable to startup the chan (%d)\n", ret);
+ mbox_free_channel(chan);
+ chan = ERR_PTR(ret);
}
- return mbox;
-}
-EXPORT_SYMBOL(omap_mbox_get);
-
-void omap_mbox_put(struct omap_mbox *mbox, struct notifier_block *nb)
-{
- blocking_notifier_chain_unregister(&mbox->notifier, nb);
- omap_mbox_fini(mbox);
+ return chan;
}
-EXPORT_SYMBOL(omap_mbox_put);
+EXPORT_SYMBOL(omap_mbox_request_channel);
static struct class omap_mbox_class = { .name = "mbox", };
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);
+ 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;
}
-
- BLOCKING_INIT_NOTIFIER_HEAD(&mbox->notifier);
}
mutex_lock(&omap_mbox_devices_lock);
list_add(&mdev->elem, &omap_mbox_devices);
mutex_unlock(&omap_mbox_devices_lock);
- return 0;
+ ret = mbox_controller_register(&mdev->controller);
err_out:
- while (i--)
- device_unregister(mboxes[i]->dev);
+ if (ret) {
+ while (i--)
+ device_unregister(mboxes[i]->dev);
+ }
return ret;
}
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",
};
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;
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)
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++;
}
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;
projects / linux-2.6-microblaze.git / blobdiff