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@@ -0,0 +1,509 @@
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+/*
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+ * OMAP mailbox driver
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+ *
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+ * Copyright (C) 2006 Nokia Corporation. All rights reserved.
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+ *
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+ * Contact: Toshihiro Kobayashi <toshihiro.kobayashi@nokia.com>
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+ * Restructured by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
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+ *
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+ * This program is free software; you can redistribute it and/or
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+ * modify it under the terms of the GNU General Public License
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+ * version 2 as published by the Free Software Foundation.
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+ *
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+ * This program is distributed in the hope that it will be useful, but
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+ * WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ * General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software
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+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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+ * 02110-1301 USA
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+ *
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+ */
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+
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+#include <linux/init.h>
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+#include <linux/module.h>
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+#include <linux/sched.h>
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+#include <linux/interrupt.h>
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+#include <linux/device.h>
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+#include <linux/blkdev.h>
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+#include <linux/err.h>
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+#include <linux/delay.h>
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+#include <asm/io.h>
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+#include <asm/arch/mailbox.h>
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+#include "mailbox.h"
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+
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+static struct omap_mbox *mboxes;
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+static DEFINE_RWLOCK(mboxes_lock);
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+
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+/* Mailbox Sequence Bit function */
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+void omap_mbox_init_seq(struct omap_mbox *mbox)
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+{
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+ mbox_seq_init(mbox);
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+}
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+EXPORT_SYMBOL(omap_mbox_init_seq);
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+
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+/*
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+ * message sender
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+ */
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+static int __mbox_msg_send(struct omap_mbox *mbox, mbox_msg_t msg, void *arg)
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+{
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+ int ret = 0, i = 1000;
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+
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+ while (mbox_fifo_full(mbox)) {
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+ if (mbox->ops->type == OMAP_MBOX_TYPE2)
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+ return -1;
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+ if (--i == 0)
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+ return -1;
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+ udelay(1);
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+ }
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+
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+ if (arg && mbox->txq->callback) {
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+ ret = mbox->txq->callback(arg);
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+ if (ret)
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+ goto out;
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+ }
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+
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+ mbox_seq_toggle(mbox, &msg);
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+ mbox_fifo_write(mbox, msg);
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+ out:
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+ return ret;
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+}
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+
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+int omap_mbox_msg_send(struct omap_mbox *mbox, mbox_msg_t msg, void* arg)
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+{
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+ struct request *rq;
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+ struct request_queue *q = mbox->txq->queue;
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+ int ret = 0;
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+
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+ rq = blk_get_request(q, WRITE, GFP_ATOMIC);
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+ if (unlikely(!rq)) {
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+ ret = -ENOMEM;
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+ goto fail;
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+ }
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+
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+ rq->data = (void *)msg;
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+ blk_insert_request(q, rq, 0, arg);
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+
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+ schedule_work(&mbox->txq->work);
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+ fail:
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+ return ret;
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+}
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+EXPORT_SYMBOL(omap_mbox_msg_send);
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+
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+static void mbox_tx_work(struct work_struct *work)
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+{
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+ int ret;
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+ struct request *rq;
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+ struct omap_mbox_queue *mq = container_of(work,
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+ struct omap_mbox_queue, work);
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+ struct omap_mbox *mbox = mq->queue->queuedata;
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+ struct request_queue *q = mbox->txq->queue;
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+
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+ while (1) {
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+ spin_lock(q->queue_lock);
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+ rq = elv_next_request(q);
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+ spin_unlock(q->queue_lock);
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+
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+ if (!rq)
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+ break;
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+
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+ ret = __mbox_msg_send(mbox, (mbox_msg_t) rq->data, rq->special);
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+ if (ret) {
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+ enable_mbox_irq(mbox, IRQ_TX);
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+ return;
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+ }
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+
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+ spin_lock(q->queue_lock);
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+ blkdev_dequeue_request(rq);
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+ end_that_request_last(rq, 0);
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+ spin_unlock(q->queue_lock);
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+ }
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+}
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+
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+/*
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+ * Message receiver(workqueue)
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+ */
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+static void mbox_rx_work(struct work_struct *work)
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+{
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+ struct omap_mbox_queue *mq =
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+ container_of(work, struct omap_mbox_queue, work);
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+ struct omap_mbox *mbox = mq->queue->queuedata;
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+ struct request_queue *q = mbox->rxq->queue;
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+ struct request *rq;
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+ mbox_msg_t msg;
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+ unsigned long flags;
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+
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+ if (mbox->rxq->callback == NULL) {
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+ sysfs_notify(&mbox->dev.kobj, NULL, "mbox");
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+ return;
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+ }
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+
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+ while (1) {
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+ spin_lock_irqsave(q->queue_lock, flags);
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+ rq = elv_next_request(q);
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+ spin_unlock_irqrestore(q->queue_lock, flags);
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+ if (!rq)
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+ break;
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+
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+ msg = (mbox_msg_t) rq->data;
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+
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+ spin_lock_irqsave(q->queue_lock, flags);
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+ blkdev_dequeue_request(rq);
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+ end_that_request_last(rq, 0);
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+ spin_unlock_irqrestore(q->queue_lock, flags);
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+
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+ mbox->rxq->callback((void *)msg);
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+ }
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+}
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+
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+/*
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+ * Mailbox interrupt handler
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+ */
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+static void mbox_txq_fn(request_queue_t * q)
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+{
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+}
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+
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+static void mbox_rxq_fn(request_queue_t * q)
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+{
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+}
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+
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+static void __mbox_tx_interrupt(struct omap_mbox *mbox)
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+{
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+ disable_mbox_irq(mbox, IRQ_TX);
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+ ack_mbox_irq(mbox, IRQ_TX);
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+ schedule_work(&mbox->txq->work);
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+}
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+
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+static void __mbox_rx_interrupt(struct omap_mbox *mbox)
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+{
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+ struct request *rq;
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+ mbox_msg_t msg;
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+ request_queue_t *q = mbox->rxq->queue;
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+
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+ disable_mbox_irq(mbox, IRQ_RX);
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+
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+ while (!mbox_fifo_empty(mbox)) {
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+ rq = blk_get_request(q, WRITE, GFP_ATOMIC);
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+ if (unlikely(!rq))
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+ goto nomem;
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+
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+ msg = mbox_fifo_read(mbox);
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+ rq->data = (void *)msg;
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+
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+ if (unlikely(mbox_seq_test(mbox, msg))) {
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+ pr_info("mbox: Illegal seq bit!(%08x)\n", msg);
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+ if (mbox->err_notify)
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+ mbox->err_notify();
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+ }
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+
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+ blk_insert_request(q, rq, 0, NULL);
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+ if (mbox->ops->type == OMAP_MBOX_TYPE1)
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+ break;
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+ }
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+
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+ /* no more messages in the fifo. clear IRQ source. */
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+ ack_mbox_irq(mbox, IRQ_RX);
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+ enable_mbox_irq(mbox, IRQ_RX);
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+ nomem:
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+ schedule_work(&mbox->rxq->work);
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+}
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+
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+static irqreturn_t mbox_interrupt(int irq, void *p)
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+{
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+ struct omap_mbox *mbox = (struct omap_mbox *)p;
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+
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+ if (is_mbox_irq(mbox, IRQ_TX))
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+ __mbox_tx_interrupt(mbox);
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+
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+ if (is_mbox_irq(mbox, IRQ_RX))
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+ __mbox_rx_interrupt(mbox);
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+
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+ return IRQ_HANDLED;
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+}
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+
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+/*
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+ * sysfs files
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+ */
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+static ssize_t
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+omap_mbox_write(struct device *dev, struct device_attribute *attr,
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+ const char * buf, size_t count)
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+{
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+ int ret;
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+ mbox_msg_t *p = (mbox_msg_t *)buf;
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+ struct omap_mbox *mbox = dev_get_drvdata(dev);
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+
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+ for (; count >= sizeof(mbox_msg_t); count -= sizeof(mbox_msg_t)) {
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+ ret = omap_mbox_msg_send(mbox, be32_to_cpu(*p), NULL);
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+ if (ret)
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+ return -EAGAIN;
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+ p++;
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+ }
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+
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+ return (size_t)((char *)p - buf);
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+}
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+
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+static ssize_t
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+omap_mbox_read(struct device *dev, struct device_attribute *attr, char *buf)
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+{
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+ unsigned long flags;
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+ struct request *rq;
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+ mbox_msg_t *p = (mbox_msg_t *) buf;
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+ struct omap_mbox *mbox = dev_get_drvdata(dev);
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+ struct request_queue *q = mbox->rxq->queue;
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+
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+ while (1) {
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+ spin_lock_irqsave(q->queue_lock, flags);
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+ rq = elv_next_request(q);
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+ spin_unlock_irqrestore(q->queue_lock, flags);
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+
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+ if (!rq)
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+ break;
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+
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+ *p = (mbox_msg_t) rq->data;
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+
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+ spin_lock_irqsave(q->queue_lock, flags);
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+ blkdev_dequeue_request(rq);
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+ end_that_request_last(rq, 0);
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+ spin_unlock_irqrestore(q->queue_lock, flags);
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+
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+ if (unlikely(mbox_seq_test(mbox, *p))) {
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+ pr_info("mbox: Illegal seq bit!(%08x) ignored\n", *p);
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+ continue;
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+ }
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+ p++;
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+ }
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+
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+ pr_debug("%02x %02x %02x %02x\n", buf[0], buf[1], buf[2], buf[3]);
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+
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+ return (size_t) ((char *)p - buf);
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+}
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+
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+static DEVICE_ATTR(mbox, S_IRUGO | S_IWUSR, omap_mbox_read, omap_mbox_write);
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+
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+static ssize_t mbox_show(struct class *class, char *buf)
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+{
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+ return sprintf(buf, "mbox");
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+}
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+
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+static CLASS_ATTR(mbox, S_IRUGO, mbox_show, NULL);
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+
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+static struct class omap_mbox_class = {
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+ .name = "omap_mbox",
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+};
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+
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+static struct omap_mbox_queue *mbox_queue_alloc(struct omap_mbox *mbox,
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+ request_fn_proc * proc,
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+ void (*work) (struct work_struct *))
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+{
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+ request_queue_t *q;
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+ struct omap_mbox_queue *mq;
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+
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+ mq = kzalloc(sizeof(struct omap_mbox_queue), GFP_KERNEL);
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+ if (!mq)
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+ return NULL;
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+
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+ spin_lock_init(&mq->lock);
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+
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+ q = blk_init_queue(proc, &mq->lock);
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+ if (!q)
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+ goto error;
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+ q->queuedata = mbox;
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+ mq->queue = q;
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+
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+ INIT_WORK(&mq->work, work);
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+
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+ return mq;
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+error:
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+ kfree(mq);
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+ return NULL;
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+}
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+
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+static void mbox_queue_free(struct omap_mbox_queue *q)
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+{
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+ blk_cleanup_queue(q->queue);
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+ kfree(q);
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+}
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+
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+static int omap_mbox_init(struct omap_mbox *mbox)
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+{
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+ int ret;
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+ struct omap_mbox_queue *mq;
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+
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+ if (likely(mbox->ops->startup)) {
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+ ret = mbox->ops->startup(mbox);
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+ if (unlikely(ret))
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+ return ret;
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+ }
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+
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+ mbox->dev.class = &omap_mbox_class;
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+ strlcpy(mbox->dev.bus_id, mbox->name, KOBJ_NAME_LEN);
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+ dev_set_drvdata(&mbox->dev, mbox);
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+
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+ ret = device_register(&mbox->dev);
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+ if (unlikely(ret))
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+ goto fail_device_reg;
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+
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+ ret = device_create_file(&mbox->dev, &dev_attr_mbox);
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+ if (unlikely(ret)) {
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+ printk(KERN_ERR
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+ "device_create_file failed: %d\n", ret);
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+ goto fail_create_mbox;
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+ }
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+
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+ ret = request_irq(mbox->irq, mbox_interrupt, IRQF_DISABLED,
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+ mbox->name, mbox);
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+ if (unlikely(ret)) {
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+ printk(KERN_ERR
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+ "failed to register mailbox interrupt:%d\n", ret);
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+ goto fail_request_irq;
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+ }
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+ enable_mbox_irq(mbox, IRQ_RX);
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+
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+ mq = mbox_queue_alloc(mbox, mbox_txq_fn, mbox_tx_work);
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+ if (!mq) {
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+ ret = -ENOMEM;
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+ goto fail_alloc_txq;
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+ }
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+ mbox->txq = mq;
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+
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+ mq = mbox_queue_alloc(mbox, mbox_rxq_fn, mbox_rx_work);
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+ if (!mq) {
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+ ret = -ENOMEM;
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+ goto fail_alloc_rxq;
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+ }
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+ mbox->rxq = mq;
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+
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+ return 0;
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+
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+ fail_alloc_rxq:
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+ mbox_queue_free(mbox->txq);
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+ fail_alloc_txq:
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+ free_irq(mbox->irq, mbox);
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+ fail_request_irq:
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+ device_remove_file(&mbox->dev, &dev_attr_mbox);
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+ fail_create_mbox:
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+ device_unregister(&mbox->dev);
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+ fail_device_reg:
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+ if (unlikely(mbox->ops->shutdown))
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+ mbox->ops->shutdown(mbox);
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+
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+ return ret;
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+}
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+
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+static void omap_mbox_fini(struct omap_mbox *mbox)
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+{
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+ mbox_queue_free(mbox->txq);
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+ mbox_queue_free(mbox->rxq);
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+
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+ free_irq(mbox->irq, mbox);
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+ device_remove_file(&mbox->dev, &dev_attr_mbox);
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+ class_unregister(&omap_mbox_class);
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+
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+ if (unlikely(mbox->ops->shutdown))
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+ mbox->ops->shutdown(mbox);
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+}
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+
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+static struct omap_mbox **find_mboxes(const char *name)
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+{
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+ struct omap_mbox **p;
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+
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+ for (p = &mboxes; *p; p = &(*p)->next) {
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+ if (strcmp((*p)->name, name) == 0)
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+ break;
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+ }
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+
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+ return p;
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+}
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+
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+struct omap_mbox *omap_mbox_get(const char *name)
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+{
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+ struct omap_mbox *mbox;
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+ int ret;
|
|
|
+
|
|
|
+ read_lock(&mboxes_lock);
|
|
|
+ mbox = *(find_mboxes(name));
|
|
|
+ if (mbox == NULL) {
|
|
|
+ read_unlock(&mboxes_lock);
|
|
|
+ return ERR_PTR(-ENOENT);
|
|
|
+ }
|
|
|
+
|
|
|
+ read_unlock(&mboxes_lock);
|
|
|
+
|
|
|
+ ret = omap_mbox_init(mbox);
|
|
|
+ if (ret)
|
|
|
+ return ERR_PTR(-ENODEV);
|
|
|
+
|
|
|
+ return mbox;
|
|
|
+}
|
|
|
+EXPORT_SYMBOL(omap_mbox_get);
|
|
|
+
|
|
|
+void omap_mbox_put(struct omap_mbox *mbox)
|
|
|
+{
|
|
|
+ omap_mbox_fini(mbox);
|
|
|
+}
|
|
|
+EXPORT_SYMBOL(omap_mbox_put);
|
|
|
+
|
|
|
+int omap_mbox_register(struct omap_mbox *mbox)
|
|
|
+{
|
|
|
+ int ret = 0;
|
|
|
+ struct omap_mbox **tmp;
|
|
|
+
|
|
|
+ if (!mbox)
|
|
|
+ return -EINVAL;
|
|
|
+ if (mbox->next)
|
|
|
+ return -EBUSY;
|
|
|
+
|
|
|
+ write_lock(&mboxes_lock);
|
|
|
+ tmp = find_mboxes(mbox->name);
|
|
|
+ if (*tmp)
|
|
|
+ ret = -EBUSY;
|
|
|
+ else
|
|
|
+ *tmp = mbox;
|
|
|
+ write_unlock(&mboxes_lock);
|
|
|
+
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+EXPORT_SYMBOL(omap_mbox_register);
|
|
|
+
|
|
|
+int omap_mbox_unregister(struct omap_mbox *mbox)
|
|
|
+{
|
|
|
+ struct omap_mbox **tmp;
|
|
|
+
|
|
|
+ write_lock(&mboxes_lock);
|
|
|
+ tmp = &mboxes;
|
|
|
+ while (*tmp) {
|
|
|
+ if (mbox == *tmp) {
|
|
|
+ *tmp = mbox->next;
|
|
|
+ mbox->next = NULL;
|
|
|
+ write_unlock(&mboxes_lock);
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+ tmp = &(*tmp)->next;
|
|
|
+ }
|
|
|
+ write_unlock(&mboxes_lock);
|
|
|
+
|
|
|
+ return -EINVAL;
|
|
|
+}
|
|
|
+EXPORT_SYMBOL(omap_mbox_unregister);
|
|
|
+
|
|
|
+static int __init omap_mbox_class_init(void)
|
|
|
+{
|
|
|
+ int ret = class_register(&omap_mbox_class);
|
|
|
+ if (!ret)
|
|
|
+ ret = class_create_file(&omap_mbox_class, &class_attr_mbox);
|
|
|
+
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+static void __exit omap_mbox_class_exit(void)
|
|
|
+{
|
|
|
+ class_remove_file(&omap_mbox_class, &class_attr_mbox);
|
|
|
+ class_unregister(&omap_mbox_class);
|
|
|
+}
|
|
|
+
|
|
|
+subsys_initcall(omap_mbox_class_init);
|
|
|
+module_exit(omap_mbox_class_exit);
|
|
|
+
|
|
|
+MODULE_LICENSE("GPL");
|