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-rw-r--r--arch/arm/plat-omap/mailbox.c152
1 files changed, 114 insertions, 38 deletions
diff --git a/arch/arm/plat-omap/mailbox.c b/arch/arm/plat-omap/mailbox.c
index b52ce053e6f..0abfbaa5987 100644
--- a/arch/arm/plat-omap/mailbox.c
+++ b/arch/arm/plat-omap/mailbox.c
@@ -1,10 +1,9 @@
/*
* 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
@@ -22,21 +21,98 @@
*
*/
-#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 <linux/io.h>
+
#include <mach/mailbox.h>
-#include "mailbox.h"
+
+static int enable_seq_bit;
+module_param(enable_seq_bit, bool, 0);
+MODULE_PARM_DESC(enable_seq_bit, "Enable sequence bit checking.");
static struct omap_mbox *mboxes;
static DEFINE_RWLOCK(mboxes_lock);
+/*
+ * Mailbox sequence bit API
+ */
+
+/* seq_rcv should be initialized with any value other than
+ * 0 and 1 << 31, to allow either value for the first
+ * message. */
+static inline void mbox_seq_init(struct omap_mbox *mbox)
+{
+ if (!enable_seq_bit)
+ return;
+
+ /* any value other than 0 and 1 << 31 */
+ mbox->seq_rcv = 0xffffffff;
+}
+
+static inline void mbox_seq_toggle(struct omap_mbox *mbox, mbox_msg_t * msg)
+{
+ if (!enable_seq_bit)
+ return;
+
+ /* add seq_snd to msg */
+ *msg = (*msg & 0x7fffffff) | mbox->seq_snd;
+ /* flip seq_snd */
+ mbox->seq_snd ^= 1 << 31;
+}
+
+static inline int mbox_seq_test(struct omap_mbox *mbox, mbox_msg_t msg)
+{
+ mbox_msg_t seq;
+
+ if (!enable_seq_bit)
+ return 0;
+
+ seq = msg & (1 << 31);
+ if (seq == mbox->seq_rcv)
+ return -1;
+ mbox->seq_rcv = seq;
+ return 0;
+}
+
+/* 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 enable_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
+{
+ mbox->ops->enable_irq(mbox, irq);
+}
+static inline void disable_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
+{
+ mbox->ops->disable_irq(mbox, irq);
+}
+static inline void ack_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
+{
+ 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);
+}
+
/* Mailbox Sequence Bit function */
void omap_mbox_init_seq(struct omap_mbox *mbox)
{
@@ -136,7 +212,7 @@ static void mbox_rx_work(struct work_struct *work)
unsigned long flags;
if (mbox->rxq->callback == NULL) {
- sysfs_notify(&mbox->dev.kobj, NULL, "mbox");
+ sysfs_notify(&mbox->dev->kobj, NULL, "mbox");
return;
}
@@ -204,7 +280,7 @@ static void __mbox_rx_interrupt(struct omap_mbox *mbox)
/* no more messages in the fifo. clear IRQ source. */
ack_mbox_irq(mbox, IRQ_RX);
enable_mbox_irq(mbox, IRQ_RX);
- nomem:
+nomem:
schedule_work(&mbox->rxq->work);
}
@@ -286,7 +362,7 @@ static ssize_t mbox_show(struct class *class, char *buf)
static CLASS_ATTR(mbox, S_IRUGO, mbox_show, NULL);
static struct class omap_mbox_class = {
- .name = "omap_mbox",
+ .name = "omap-mailbox",
};
static struct omap_mbox_queue *mbox_queue_alloc(struct omap_mbox *mbox,
@@ -333,21 +409,6 @@ static int omap_mbox_init(struct omap_mbox *mbox)
return ret;
}
- mbox->dev.class = &omap_mbox_class;
- dev_set_name(&mbox->dev, "%s", mbox->name);
- dev_set_drvdata(&mbox->dev, 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;
- }
-
ret = request_irq(mbox->irq, mbox_interrupt, IRQF_DISABLED,
mbox->name, mbox);
if (unlikely(ret)) {
@@ -377,10 +438,6 @@ static int omap_mbox_init(struct omap_mbox *mbox)
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);
@@ -393,8 +450,6 @@ static void omap_mbox_fini(struct omap_mbox *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);
@@ -440,7 +495,7 @@ void omap_mbox_put(struct omap_mbox *mbox)
}
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;
@@ -450,14 +505,31 @@ int omap_mbox_register(struct omap_mbox *mbox)
if (mbox->next)
return -EBUSY;
+ mbox->dev = device_create(&omap_mbox_class,
+ parent, 0, mbox, "%s", mbox->name);
+ if (IS_ERR(mbox->dev))
+ return PTR_ERR(mbox->dev);
+
+ ret = device_create_file(mbox->dev, &dev_attr_mbox);
+ if (ret)
+ goto err_sysfs;
+
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:
+ device_remove_file(mbox->dev, &dev_attr_mbox);
+err_sysfs:
+ device_unregister(mbox->dev);
return ret;
}
EXPORT_SYMBOL(omap_mbox_register);
@@ -473,6 +545,8 @@ int omap_mbox_unregister(struct omap_mbox *mbox)
*tmp = mbox->next;
mbox->next = NULL;
write_unlock(&mboxes_lock);
+ device_remove_file(mbox->dev, &dev_attr_mbox);
+ device_unregister(mbox->dev);
return 0;
}
tmp = &(*tmp)->next;
@@ -501,4 +575,6 @@ static void __exit omap_mbox_class_exit(void)
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");
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-17 06:15:27 +0000