diff options
author | Russell King <rmk@dyn-67.arm.linux.org.uk> | 2009-03-25 18:31:35 +0000 |
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committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2009-03-25 18:31:35 +0000 |
commit | 8937b7349ca9e25a02b2a72ccb7fba404ddedc5b (patch) | |
tree | 434ffe23d318f8af55850a26c3431ce8b82ab6f4 /arch/arm/plat-omap/mailbox.c | |
parent | 997302259f386bca8fe1db67c50296ca426c438f (diff) | |
parent | ffe7f95bb1a4d1e9ca5d252445dc38476e1a208e (diff) |
Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap-2.6 into devel
Diffstat (limited to 'arch/arm/plat-omap/mailbox.c')
-rw-r--r-- | arch/arm/plat-omap/mailbox.c | 152 |
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"); |