/*
* OMAP mailbox driver
*
- * Copyright (C) 2006 Nokia Corporation. All rights reserved.
+ * Copyright (C) 2006-2009 Nokia Corporation. All rights reserved.
*
- * Contact: Toshihiro Kobayashi <toshihiro.kobayashi@nokia.com>
- * Restructured by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
+ * Contact: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
*
*/
-#include <linux/init.h>
#include <linux/module.h>
-#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/device.h>
-#include <linux/blkdev.h>
-#include <linux/err.h>
#include <linux/delay.h>
-#include <asm/io.h>
-#include <asm/arch/mailbox.h>
-#include "mailbox.h"
+#include <linux/slab.h>
+#include <plat/mailbox.h>
+
+static struct workqueue_struct *mboxd;
static struct omap_mbox *mboxes;
static DEFINE_RWLOCK(mboxes_lock);
-/* Mailbox Sequence Bit function */
-void omap_mbox_init_seq(struct omap_mbox *mbox)
+static int mbox_configured;
+
+/* Mailbox FIFO handle functions */
+static inline mbox_msg_t mbox_fifo_read(struct omap_mbox *mbox)
+{
+ return mbox->ops->fifo_read(mbox);
+}
+static inline void mbox_fifo_write(struct omap_mbox *mbox, mbox_msg_t msg)
+{
+ mbox->ops->fifo_write(mbox, msg);
+}
+static inline int mbox_fifo_empty(struct omap_mbox *mbox)
+{
+ return mbox->ops->fifo_empty(mbox);
+}
+static inline int mbox_fifo_full(struct omap_mbox *mbox)
+{
+ return mbox->ops->fifo_full(mbox);
+}
+
+/* Mailbox IRQ handle functions */
+static inline void ack_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
{
- mbox_seq_init(mbox);
+ if (mbox->ops->ack_irq)
+ mbox->ops->ack_irq(mbox, irq);
+}
+static inline int is_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
+{
+ return mbox->ops->is_irq(mbox, irq);
}
-EXPORT_SYMBOL(omap_mbox_init_seq);
/*
* message sender
*/
-static int __mbox_msg_send(struct omap_mbox *mbox, mbox_msg_t msg, void *arg)
+static int __mbox_msg_send(struct omap_mbox *mbox, mbox_msg_t msg)
{
int ret = 0, i = 1000;
return -1;
udelay(1);
}
-
- if (arg && mbox->txq->callback) {
- ret = mbox->txq->callback(arg);
- if (ret)
- goto out;
- }
-
- mbox_seq_toggle(mbox, &msg);
mbox_fifo_write(mbox, msg);
- out:
return ret;
}
-int omap_mbox_msg_send(struct omap_mbox *mbox, mbox_msg_t msg, void* arg)
+
+int omap_mbox_msg_send(struct omap_mbox *mbox, mbox_msg_t msg)
{
+
struct request *rq;
struct request_queue *q = mbox->txq->queue;
- int ret = 0;
rq = blk_get_request(q, WRITE, GFP_ATOMIC);
- if (unlikely(!rq)) {
- ret = -ENOMEM;
- goto fail;
- }
+ if (unlikely(!rq))
+ return -ENOMEM;
- rq->data = (void *)msg;
- blk_insert_request(q, rq, 0, arg);
+ blk_insert_request(q, rq, 0, (void *) msg);
+ tasklet_schedule(&mbox->txq->tasklet);
- schedule_work(&mbox->txq->work);
- fail:
- return ret;
+ return 0;
}
EXPORT_SYMBOL(omap_mbox_msg_send);
-static void mbox_tx_work(struct work_struct *work)
+static void mbox_tx_tasklet(unsigned long tx_data)
{
int ret;
struct request *rq;
- struct omap_mbox_queue *mq = container_of(work,
- struct omap_mbox_queue, work);
- struct omap_mbox *mbox = mq->queue->queuedata;
+ struct omap_mbox *mbox = (struct omap_mbox *)tx_data;
struct request_queue *q = mbox->txq->queue;
while (1) {
- spin_lock(q->queue_lock);
- rq = elv_next_request(q);
- spin_unlock(q->queue_lock);
+
+ rq = blk_fetch_request(q);
if (!rq)
break;
- ret = __mbox_msg_send(mbox, (mbox_msg_t) rq->data, rq->special);
+ ret = __mbox_msg_send(mbox, (mbox_msg_t)rq->special);
if (ret) {
- enable_mbox_irq(mbox, IRQ_TX);
+ omap_mbox_enable_irq(mbox, IRQ_TX);
+ blk_requeue_request(q, rq);
return;
}
-
- spin_lock(q->queue_lock);
- if (__blk_end_request(rq, 0, 0))
- BUG();
- spin_unlock(q->queue_lock);
+ blk_end_request_all(rq, 0);
}
}
mbox_msg_t msg;
unsigned long flags;
- if (mbox->rxq->callback == NULL) {
- sysfs_notify(&mbox->dev.kobj, NULL, "mbox");
- return;
- }
-
while (1) {
spin_lock_irqsave(q->queue_lock, flags);
- rq = elv_next_request(q);
+ rq = blk_fetch_request(q);
spin_unlock_irqrestore(q->queue_lock, flags);
if (!rq)
break;
- msg = (mbox_msg_t) rq->data;
-
- if (blk_end_request(rq, 0, 0))
- BUG();
-
+ msg = (mbox_msg_t)rq->special;
+ blk_end_request_all(rq, 0);
mbox->rxq->callback((void *)msg);
}
}
/*
* Mailbox interrupt handler
*/
-static void mbox_txq_fn(struct request_queue * q)
+static void mbox_txq_fn(struct request_queue *q)
{
}
-static void mbox_rxq_fn(struct request_queue * q)
+static void mbox_rxq_fn(struct request_queue *q)
{
}
static void __mbox_tx_interrupt(struct omap_mbox *mbox)
{
- disable_mbox_irq(mbox, IRQ_TX);
+ omap_mbox_disable_irq(mbox, IRQ_TX);
ack_mbox_irq(mbox, IRQ_TX);
- schedule_work(&mbox->txq->work);
+ tasklet_schedule(&mbox->txq->tasklet);
}
static void __mbox_rx_interrupt(struct omap_mbox *mbox)
mbox_msg_t msg;
struct request_queue *q = mbox->rxq->queue;
- disable_mbox_irq(mbox, IRQ_RX);
-
while (!mbox_fifo_empty(mbox)) {
rq = blk_get_request(q, WRITE, GFP_ATOMIC);
if (unlikely(!rq))
goto nomem;
msg = mbox_fifo_read(mbox);
- rq->data = (void *)msg;
- if (unlikely(mbox_seq_test(mbox, msg))) {
- pr_info("mbox: Illegal seq bit!(%08x)\n", msg);
- if (mbox->err_notify)
- mbox->err_notify();
- }
- blk_insert_request(q, rq, 0, NULL);
+ blk_insert_request(q, rq, 0, (void *)msg);
if (mbox->ops->type == OMAP_MBOX_TYPE1)
break;
}
/* no more messages in the fifo. clear IRQ source. */
ack_mbox_irq(mbox, IRQ_RX);
- enable_mbox_irq(mbox, IRQ_RX);
- nomem:
- schedule_work(&mbox->rxq->work);
+nomem:
+ queue_work(mboxd, &mbox->rxq->work);
}
static irqreturn_t mbox_interrupt(int irq, void *p)
return IRQ_HANDLED;
}
-/*
- * sysfs files
- */
-static ssize_t
-omap_mbox_write(struct device *dev, struct device_attribute *attr,
- const char * buf, size_t count)
-{
- int ret;
- mbox_msg_t *p = (mbox_msg_t *)buf;
- struct omap_mbox *mbox = dev_get_drvdata(dev);
-
- for (; count >= sizeof(mbox_msg_t); count -= sizeof(mbox_msg_t)) {
- ret = omap_mbox_msg_send(mbox, be32_to_cpu(*p), NULL);
- if (ret)
- return -EAGAIN;
- p++;
- }
-
- return (size_t)((char *)p - buf);
-}
-
-static ssize_t
-omap_mbox_read(struct device *dev, struct device_attribute *attr, char *buf)
-{
- unsigned long flags;
- struct request *rq;
- mbox_msg_t *p = (mbox_msg_t *) buf;
- struct omap_mbox *mbox = dev_get_drvdata(dev);
- struct request_queue *q = mbox->rxq->queue;
-
- while (1) {
- spin_lock_irqsave(q->queue_lock, flags);
- rq = elv_next_request(q);
- spin_unlock_irqrestore(q->queue_lock, flags);
-
- if (!rq)
- break;
-
- *p = (mbox_msg_t) rq->data;
-
- if (blk_end_request(rq, 0, 0))
- BUG();
-
- if (unlikely(mbox_seq_test(mbox, *p))) {
- pr_info("mbox: Illegal seq bit!(%08x) ignored\n", *p);
- continue;
- }
- p++;
- }
-
- pr_debug("%02x %02x %02x %02x\n", buf[0], buf[1], buf[2], buf[3]);
-
- return (size_t) ((char *)p - buf);
-}
-
-static DEVICE_ATTR(mbox, S_IRUGO | S_IWUSR, omap_mbox_read, omap_mbox_write);
-
-static ssize_t mbox_show(struct class *class, char *buf)
-{
- return sprintf(buf, "mbox");
-}
-
-static CLASS_ATTR(mbox, S_IRUGO, mbox_show, NULL);
-
-static struct class omap_mbox_class = {
- .name = "omap_mbox",
-};
-
static struct omap_mbox_queue *mbox_queue_alloc(struct omap_mbox *mbox,
- request_fn_proc * proc,
- void (*work) (struct work_struct *))
+ request_fn_proc *proc,
+ void (*work) (struct work_struct *),
+ void (*tasklet)(unsigned long))
{
struct request_queue *q;
struct omap_mbox_queue *mq;
q->queuedata = mbox;
mq->queue = q;
- INIT_WORK(&mq->work, work);
+ if (work)
+ INIT_WORK(&mq->work, work);
+ if (tasklet)
+ tasklet_init(&mq->tasklet, tasklet, (unsigned long)mbox);
return mq;
error:
kfree(mq);
kfree(q);
}
-static int omap_mbox_init(struct omap_mbox *mbox)
+static int omap_mbox_startup(struct omap_mbox *mbox)
{
- int ret;
+ int ret = 0;
struct omap_mbox_queue *mq;
if (likely(mbox->ops->startup)) {
- ret = mbox->ops->startup(mbox);
- if (unlikely(ret))
- return ret;
- }
-
- mbox->dev.class = &omap_mbox_class;
- strlcpy(mbox->dev.bus_id, mbox->name, BUS_ID_SIZE);
- dev_set_drvdata(&mbox->dev, mbox);
+ write_lock(&mboxes_lock);
+ if (!mbox_configured)
+ ret = mbox->ops->startup(mbox);
- ret = device_register(&mbox->dev);
- if (unlikely(ret))
- goto fail_device_reg;
-
- ret = device_create_file(&mbox->dev, &dev_attr_mbox);
- if (unlikely(ret)) {
- printk(KERN_ERR
- "device_create_file failed: %d\n", ret);
- goto fail_create_mbox;
+ if (unlikely(ret)) {
+ write_unlock(&mboxes_lock);
+ return ret;
+ }
+ mbox_configured++;
+ write_unlock(&mboxes_lock);
}
- ret = request_irq(mbox->irq, mbox_interrupt, IRQF_DISABLED,
+ ret = request_irq(mbox->irq, mbox_interrupt, IRQF_SHARED,
mbox->name, mbox);
if (unlikely(ret)) {
printk(KERN_ERR
goto fail_request_irq;
}
- mq = mbox_queue_alloc(mbox, mbox_txq_fn, mbox_tx_work);
+ mq = mbox_queue_alloc(mbox, mbox_txq_fn, NULL, mbox_tx_tasklet);
if (!mq) {
ret = -ENOMEM;
goto fail_alloc_txq;
}
mbox->txq = mq;
- mq = mbox_queue_alloc(mbox, mbox_rxq_fn, mbox_rx_work);
+ mq = mbox_queue_alloc(mbox, mbox_rxq_fn, mbox_rx_work, NULL);
if (!mq) {
ret = -ENOMEM;
goto fail_alloc_rxq;
fail_alloc_txq:
free_irq(mbox->irq, mbox);
fail_request_irq:
- device_remove_file(&mbox->dev, &dev_attr_mbox);
- fail_create_mbox:
- device_unregister(&mbox->dev);
- fail_device_reg:
if (unlikely(mbox->ops->shutdown))
mbox->ops->shutdown(mbox);
mbox_queue_free(mbox->rxq);
free_irq(mbox->irq, mbox);
- device_remove_file(&mbox->dev, &dev_attr_mbox);
- class_unregister(&omap_mbox_class);
- if (unlikely(mbox->ops->shutdown))
- mbox->ops->shutdown(mbox);
+ if (unlikely(mbox->ops->shutdown)) {
+ write_lock(&mboxes_lock);
+ if (mbox_configured > 0)
+ mbox_configured--;
+ if (!mbox_configured)
+ mbox->ops->shutdown(mbox);
+ write_unlock(&mboxes_lock);
+ }
}
static struct omap_mbox **find_mboxes(const char *name)
read_unlock(&mboxes_lock);
- ret = omap_mbox_init(mbox);
+ ret = omap_mbox_startup(mbox);
if (ret)
return ERR_PTR(-ENODEV);
}
EXPORT_SYMBOL(omap_mbox_put);
-int omap_mbox_register(struct omap_mbox *mbox)
+int omap_mbox_register(struct device *parent, struct omap_mbox *mbox)
{
int ret = 0;
struct omap_mbox **tmp;
write_lock(&mboxes_lock);
tmp = find_mboxes(mbox->name);
- if (*tmp)
+ if (*tmp) {
ret = -EBUSY;
- else
- *tmp = mbox;
+ write_unlock(&mboxes_lock);
+ goto err_find;
+ }
+ *tmp = mbox;
write_unlock(&mboxes_lock);
+ return 0;
+
+err_find:
return ret;
}
EXPORT_SYMBOL(omap_mbox_register);
}
EXPORT_SYMBOL(omap_mbox_unregister);
-static int __init omap_mbox_class_init(void)
+static int __init omap_mbox_init(void)
{
- int ret = class_register(&omap_mbox_class);
- if (!ret)
- ret = class_create_file(&omap_mbox_class, &class_attr_mbox);
+ mboxd = create_workqueue("mboxd");
+ if (!mboxd)
+ return -ENOMEM;
- return ret;
+ return 0;
}
+module_init(omap_mbox_init);
-static void __exit omap_mbox_class_exit(void)
+static void __exit omap_mbox_exit(void)
{
- class_remove_file(&omap_mbox_class, &class_attr_mbox);
- class_unregister(&omap_mbox_class);
+ destroy_workqueue(mboxd);
}
+module_exit(omap_mbox_exit);
-subsys_initcall(omap_mbox_class_init);
-module_exit(omap_mbox_class_exit);
-
-MODULE_LICENSE("GPL");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("omap mailbox: interrupt driven messaging");
+MODULE_AUTHOR("Toshihiro Kobayashi and Hiroshi DOYU");
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff