1 files changed, 118 insertions, 130 deletions

diff --git a/arch/arm/plat-omap/mailbox.c b/arch/arm/plat-omap/mailbox.c
index 08a2df766289..d2fafb892f7f 100644
--- a/arch/arm/plat-omap/mailbox.c
+++ b/arch/arm/plat-omap/mailbox.c
@@ -21,19 +21,26 @@
  *
  */
 
-#include <linux/module.h>
 #include <linux/interrupt.h>
-#include <linux/device.h>
+#include <linux/spinlock.h>
+#include <linux/mutex.h>
 #include <linux/delay.h>
 #include <linux/slab.h>
+#include <linux/kfifo.h>
+#include <linux/err.h>
 
 #include <plat/mailbox.h>
 
 static struct workqueue_struct *mboxd;
-static struct omap_mbox *mboxes;
-static DEFINE_RWLOCK(mboxes_lock);
+static struct omap_mbox **mboxes;
+static bool rq_full;
 
 static int mbox_configured;
+static DEFINE_MUTEX(mbox_configured_lock);
+
+static unsigned int mbox_kfifo_size = CONFIG_OMAP_MBOX_KFIFO_SIZE;
+module_param(mbox_kfifo_size, uint, S_IRUGO);
+MODULE_PARM_DESC(mbox_kfifo_size, "Size of omap's mailbox kfifo (bytes)");
 
 /* Mailbox FIFO handle functions */
 static inline mbox_msg_t mbox_fifo_read(struct omap_mbox *mbox)
@@ -67,7 +74,7 @@ static inline int is_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
 /*
  * message sender
  */
-static int __mbox_msg_send(struct omap_mbox *mbox, mbox_msg_t msg)
+static int __mbox_poll_for_space(struct omap_mbox *mbox)
 {
         int ret = 0, i = 1000;
 
@@ -78,49 +85,50 @@ static int __mbox_msg_send(struct omap_mbox *mbox, mbox_msg_t msg)
                         return -1;
                 udelay(1);
         }
-        mbox_fifo_write(mbox, msg);
         return ret;
 }
 
-
 int omap_mbox_msg_send(struct omap_mbox *mbox, mbox_msg_t msg)
 {
+        struct omap_mbox_queue *mq = mbox->txq;
+        int ret = 0, len;
 
-        struct request *rq;
-        struct request_queue *q = mbox->txq->queue;
+        spin_lock(&mq->lock);
 
-        rq = blk_get_request(q, WRITE, GFP_ATOMIC);
-        if (unlikely(!rq))
-                return -ENOMEM;
+        if (kfifo_avail(&mq->fifo) < sizeof(msg)) {
+                ret = -ENOMEM;
+                goto out;
+        }
+
+        len = kfifo_in(&mq->fifo, (unsigned char *)&msg, sizeof(msg));
+        WARN_ON(len != sizeof(msg));
 
-        blk_insert_request(q, rq, 0, (void *) msg);
         tasklet_schedule(&mbox->txq->tasklet);
 
-        return 0;
+out:
+        spin_unlock(&mq->lock);
+        return ret;
 }
 EXPORT_SYMBOL(omap_mbox_msg_send);
 
 static void mbox_tx_tasklet(unsigned long tx_data)
 {
-        int ret;
-        struct request *rq;
         struct omap_mbox *mbox = (struct omap_mbox *)tx_data;
-        struct request_queue *q = mbox->txq->queue;
-
-        while (1) {
-
-                rq = blk_fetch_request(q);
-
-                if (!rq)
-                        break;
+        struct omap_mbox_queue *mq = mbox->txq;
+        mbox_msg_t msg;
+        int ret;
 
-                ret = __mbox_msg_send(mbox, (mbox_msg_t)rq->special);
-                if (ret) {
+        while (kfifo_len(&mq->fifo)) {
+                if (__mbox_poll_for_space(mbox)) {
                         omap_mbox_enable_irq(mbox, IRQ_TX);
-                        blk_requeue_request(q, rq);
-                        return;
+                        break;
                 }
-                blk_end_request_all(rq, 0);
+
+                ret = kfifo_out(&mq->fifo, (unsigned char *)&msg,
+                                                                sizeof(msg));
+                WARN_ON(ret != sizeof(msg));
+
+                mbox_fifo_write(mbox, msg);
         }
 }
 
@@ -131,36 +139,21 @@ static void mbox_rx_work(struct work_struct *work)
 {
         struct omap_mbox_queue *mq =
                         container_of(work, struct omap_mbox_queue, work);
-        struct omap_mbox *mbox = mq->queue->queuedata;
-        struct request_queue *q = mbox->rxq->queue;
-        struct request *rq;
         mbox_msg_t msg;
-        unsigned long flags;
+        int len;
 
-        while (1) {
-                spin_lock_irqsave(q->queue_lock, flags);
-                rq = blk_fetch_request(q);
-                spin_unlock_irqrestore(q->queue_lock, flags);
-                if (!rq)
-                        break;
+        while (kfifo_len(&mq->fifo) >= sizeof(msg)) {
+                len = kfifo_out(&mq->fifo, (unsigned char *)&msg, sizeof(msg));
+                WARN_ON(len != sizeof(msg));
 
-                msg = (mbox_msg_t)rq->special;
-                blk_end_request_all(rq, 0);
-                mbox->rxq->callback((void *)msg);
+                if (mq->callback)
+                        mq->callback((void *)msg);
         }
 }
 
 /*
  * Mailbox interrupt handler
  */
-static void mbox_txq_fn(struct request_queue *q)
-{
-}
-
-static void mbox_rxq_fn(struct request_queue *q)
-{
-}
-
 static void __mbox_tx_interrupt(struct omap_mbox *mbox)
 {
         omap_mbox_disable_irq(mbox, IRQ_TX);
@@ -170,19 +163,22 @@ static void __mbox_tx_interrupt(struct omap_mbox *mbox)
 
 static void __mbox_rx_interrupt(struct omap_mbox *mbox)
 {
-        struct request *rq;
+        struct omap_mbox_queue *mq = mbox->rxq;
         mbox_msg_t msg;
-        struct request_queue *q = mbox->rxq->queue;
+        int len;
 
         while (!mbox_fifo_empty(mbox)) {
-                rq = blk_get_request(q, WRITE, GFP_ATOMIC);
-                if (unlikely(!rq))
+                if (unlikely(kfifo_avail(&mq->fifo) < sizeof(msg))) {
+                        omap_mbox_disable_irq(mbox, IRQ_RX);
+                        rq_full = true;
                         goto nomem;
+                }
 
                 msg = mbox_fifo_read(mbox);
 
+                len = kfifo_in(&mq->fifo, (unsigned char *)&msg, sizeof(msg));
+                WARN_ON(len != sizeof(msg));
 
-                blk_insert_request(q, rq, 0, (void *)msg);
                 if (mbox->ops->type == OMAP_MBOX_TYPE1)
                         break;
         }
@@ -207,11 +203,9 @@ static irqreturn_t mbox_interrupt(int irq, void *p)
 }
 
 static struct omap_mbox_queue *mbox_queue_alloc(struct omap_mbox *mbox,
-                                        request_fn_proc *proc,
                                         void (*work) (struct work_struct *),
                                         void (*tasklet)(unsigned long))
 {
-        struct request_queue *q;
         struct omap_mbox_queue *mq;
 
         mq = kzalloc(sizeof(struct omap_mbox_queue), GFP_KERNEL);
@@ -220,11 +214,8 @@ static struct omap_mbox_queue *mbox_queue_alloc(struct omap_mbox *mbox,
 
         spin_lock_init(&mq->lock);
 
-        q = blk_init_queue(proc, &mq->lock);
-        if (!q)
+        if (kfifo_alloc(&mq->fifo, mbox_kfifo_size, GFP_KERNEL))
                 goto error;
-        q->queuedata = mbox;
-        mq->queue = q;
 
         if (work)
                 INIT_WORK(&mq->work, work);
@@ -239,7 +230,7 @@ error:
 
 static void mbox_queue_free(struct omap_mbox_queue *q)
 {
-        blk_cleanup_queue(q->queue);
+        kfifo_free(&q->fifo);
         kfree(q);
 }
 
@@ -248,35 +239,35 @@ static int omap_mbox_startup(struct omap_mbox *mbox)
         int ret = 0;
         struct omap_mbox_queue *mq;
 
-        if (likely(mbox->ops->startup)) {
-                write_lock(&mboxes_lock);
+        if (mbox->ops->startup) {
+                mutex_lock(&mbox_configured_lock);
                 if (!mbox_configured)
                         ret = mbox->ops->startup(mbox);
 
-                if (unlikely(ret)) {
-                        write_unlock(&mboxes_lock);
+                if (ret) {
+                        mutex_unlock(&mbox_configured_lock);
                         return ret;
                 }
                 mbox_configured++;
-                write_unlock(&mboxes_lock);
+                mutex_unlock(&mbox_configured_lock);
         }
 
         ret = request_irq(mbox->irq, mbox_interrupt, IRQF_SHARED,
                                 mbox->name, mbox);
-        if (unlikely(ret)) {
+        if (ret) {
                 printk(KERN_ERR
                         "failed to register mailbox interrupt:%d\n", ret);
                 goto fail_request_irq;
         }
 
-        mq = mbox_queue_alloc(mbox, mbox_txq_fn, NULL, mbox_tx_tasklet);
+        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_rxq_fn, mbox_rx_work, NULL);
+        mq = mbox_queue_alloc(mbox, mbox_rx_work, NULL);
         if (!mq) {
                 ret = -ENOMEM;
                 goto fail_alloc_rxq;
@@ -290,7 +281,7 @@ static int omap_mbox_startup(struct omap_mbox *mbox)
  fail_alloc_txq:
         free_irq(mbox->irq, mbox);
  fail_request_irq:
-        if (unlikely(mbox->ops->shutdown))
+        if (mbox->ops->shutdown)
                 mbox->ops->shutdown(mbox);
 
         return ret;
@@ -298,31 +289,20 @@ static int omap_mbox_startup(struct omap_mbox *mbox)
 
 static void omap_mbox_fini(struct omap_mbox *mbox)
 {
+        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);
 
-        free_irq(mbox->irq, mbox);
-
-        if (unlikely(mbox->ops->shutdown)) {
-                write_lock(&mboxes_lock);
+        if (mbox->ops->shutdown) {
+                mutex_lock(&mbox_configured_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)
-{
-        struct omap_mbox **p;
-
-        for (p = &mboxes; *p; p = &(*p)->next) {
-                if (strcmp((*p)->name, name) == 0)
-                        break;
+                mutex_unlock(&mbox_configured_lock);
         }
-
-        return p;
 }
 
 struct omap_mbox *omap_mbox_get(const char *name)
@@ -330,14 +310,15 @@ struct omap_mbox *omap_mbox_get(const char *name)
         struct omap_mbox *mbox;
         int ret;
 
-        read_lock(&mboxes_lock);
-        mbox = *(find_mboxes(name));
-        if (mbox == NULL) {
-                read_unlock(&mboxes_lock);
-                return ERR_PTR(-ENOENT);
-        }
+        if (!mboxes)
+                return ERR_PTR(-EINVAL);
 
-        read_unlock(&mboxes_lock);
+        for (mbox = *mboxes; mbox; mbox++)
+                if (!strcmp(mbox->name, name))
+                        break;
+
+        if (!mbox)
+                return ERR_PTR(-ENOENT);
 
         ret = omap_mbox_startup(mbox);
         if (ret)
@@ -353,70 +334,77 @@ void omap_mbox_put(struct omap_mbox *mbox)
 }
 EXPORT_SYMBOL(omap_mbox_put);
 
-int omap_mbox_register(struct device *parent, struct omap_mbox *mbox)
+static struct class omap_mbox_class = { .name = "mbox", };
+
+int omap_mbox_register(struct device *parent, struct omap_mbox **list)
 {
-        int ret = 0;
-        struct omap_mbox **tmp;
+        int ret;
+        int i;
 
-        if (!mbox)
+        mboxes = list;
+        if (!mboxes)
                 return -EINVAL;
-        if (mbox->next)
-                return -EBUSY;
-
-        write_lock(&mboxes_lock);
-        tmp = find_mboxes(mbox->name);
-        if (*tmp) {
-                ret = -EBUSY;
-                write_unlock(&mboxes_lock);
-                goto err_find;
-        }
-        *tmp = mbox;
-        write_unlock(&mboxes_lock);
 
+        for (i = 0; mboxes[i]; i++) {
+                struct omap_mbox *mbox = mboxes[i];
+                mbox->dev = device_create(&omap_mbox_class,
+                                parent, 0, mbox, "%s", mbox->name);
+                if (IS_ERR(mbox->dev)) {
+                        ret = PTR_ERR(mbox->dev);
+                        goto err_out;
+                }
+        }
         return 0;
 
-err_find:
+err_out:
+        while (i--)
+                device_unregister(mboxes[i]->dev);
         return ret;
 }
 EXPORT_SYMBOL(omap_mbox_register);
 
-int omap_mbox_unregister(struct omap_mbox *mbox)
+int omap_mbox_unregister(void)
 {
-        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);
+        int i;
+
+        if (!mboxes)
+                return -EINVAL;
 
-        return -EINVAL;
+        for (i = 0; mboxes[i]; i++)
+                device_unregister(mboxes[i]->dev);
+        mboxes = NULL;
+        return 0;
 }
 EXPORT_SYMBOL(omap_mbox_unregister);
 
 static int __init omap_mbox_init(void)
 {
+        int err;
+
+        err = class_register(&omap_mbox_class);
+        if (err)
+                return err;
+
         mboxd = create_workqueue("mboxd");
         if (!mboxd)
                 return -ENOMEM;
 
+        /* kfifo size sanity check: alignment and minimal size */
+        mbox_kfifo_size = ALIGN(mbox_kfifo_size, sizeof(mbox_msg_t));
+        mbox_kfifo_size = max_t(unsigned int, mbox_kfifo_size, sizeof(mbox_msg_t));
+
         return 0;
 }
-module_init(omap_mbox_init);
+subsys_initcall(omap_mbox_init);
 
 static void __exit omap_mbox_exit(void)
 {
         destroy_workqueue(mboxd);
+        class_unregister(&omap_mbox_class);
 }
 module_exit(omap_mbox_exit);
 
 MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("omap mailbox: interrupt driven messaging");
-MODULE_AUTHOR("Toshihiro Kobayashi and Hiroshi DOYU");
+MODULE_AUTHOR("Toshihiro Kobayashi");
+MODULE_AUTHOR("Hiroshi DOYU");