1 files changed, 123 insertions, 0 deletions

diff --git a/drivers/dma/virt-dma.c b/drivers/dma/virt-dma.c
new file mode 100644
index 000000000000..6f80432a3f0a
--- /dev/null
+++ b/drivers/dma/virt-dma.c
@@ -0,0 +1,123 @@
+/*
+ * Virtual DMA channel support for DMAengine
+ *
+ * Copyright (C) 2012 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/device.h>
+#include <linux/dmaengine.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+
+#include "virt-dma.h"
+
+static struct virt_dma_desc *to_virt_desc(struct dma_async_tx_descriptor *tx)
+{
+        return container_of(tx, struct virt_dma_desc, tx);
+}
+
+dma_cookie_t vchan_tx_submit(struct dma_async_tx_descriptor *tx)
+{
+        struct virt_dma_chan *vc = to_virt_chan(tx->chan);
+        struct virt_dma_desc *vd = to_virt_desc(tx);
+        unsigned long flags;
+        dma_cookie_t cookie;
+
+        spin_lock_irqsave(&vc->lock, flags);
+        cookie = dma_cookie_assign(tx);
+
+        list_add_tail(&vd->node, &vc->desc_submitted);
+        spin_unlock_irqrestore(&vc->lock, flags);
+
+        dev_dbg(vc->chan.device->dev, "vchan %p: txd %p[%x]: submitted\n",
+                vc, vd, cookie);
+
+        return cookie;
+}
+EXPORT_SYMBOL_GPL(vchan_tx_submit);
+
+struct virt_dma_desc *vchan_find_desc(struct virt_dma_chan *vc,
+        dma_cookie_t cookie)
+{
+        struct virt_dma_desc *vd;
+
+        list_for_each_entry(vd, &vc->desc_issued, node)
+                if (vd->tx.cookie == cookie)
+                        return vd;
+
+        return NULL;
+}
+EXPORT_SYMBOL_GPL(vchan_find_desc);
+
+/*
+ * This tasklet handles the completion of a DMA descriptor by
+ * calling its callback and freeing it.
+ */
+static void vchan_complete(unsigned long arg)
+{
+        struct virt_dma_chan *vc = (struct virt_dma_chan *)arg;
+        struct virt_dma_desc *vd;
+        dma_async_tx_callback cb = NULL;
+        void *cb_data = NULL;
+        LIST_HEAD(head);
+
+        spin_lock_irq(&vc->lock);
+        list_splice_tail_init(&vc->desc_completed, &head);
+        vd = vc->cyclic;
+        if (vd) {
+                vc->cyclic = NULL;
+                cb = vd->tx.callback;
+                cb_data = vd->tx.callback_param;
+        }
+        spin_unlock_irq(&vc->lock);
+
+        if (cb)
+                cb(cb_data);
+
+        while (!list_empty(&head)) {
+                vd = list_first_entry(&head, struct virt_dma_desc, node);
+                cb = vd->tx.callback;
+                cb_data = vd->tx.callback_param;
+
+                list_del(&vd->node);
+
+                vc->desc_free(vd);
+
+                if (cb)
+                        cb(cb_data);
+        }
+}
+
+void vchan_dma_desc_free_list(struct virt_dma_chan *vc, struct list_head *head)
+{
+        while (!list_empty(head)) {
+                struct virt_dma_desc *vd = list_first_entry(head,
+                        struct virt_dma_desc, node);
+                list_del(&vd->node);
+                dev_dbg(vc->chan.device->dev, "txd %p: freeing\n", vd);
+                vc->desc_free(vd);
+        }
+}
+EXPORT_SYMBOL_GPL(vchan_dma_desc_free_list);
+
+void vchan_init(struct virt_dma_chan *vc, struct dma_device *dmadev)
+{
+        dma_cookie_init(&vc->chan);
+
+        spin_lock_init(&vc->lock);
+        INIT_LIST_HEAD(&vc->desc_submitted);
+        INIT_LIST_HEAD(&vc->desc_issued);
+        INIT_LIST_HEAD(&vc->desc_completed);
+
+        tasklet_init(&vc->task, vchan_complete, (unsigned long)vc);
+
+        vc->chan.device = dmadev;
+        list_add_tail(&vc->chan.device_node, &dmadev->channels);
+}
+EXPORT_SYMBOL_GPL(vchan_init);
+
+MODULE_AUTHOR("Russell King");
+MODULE_LICENSE("GPL");