#include <linux/init.h>
#include <linux/module.h>
+#include <linux/mm.h>
#include <linux/device.h>
#include <linux/dmaengine.h>
#include <linux/hardirq.h>
#include <linux/percpu.h>
#include <linux/rcupdate.h>
#include <linux/mutex.h>
+#include <linux/jiffies.h>
static DEFINE_MUTEX(dma_list_mutex);
static LIST_HEAD(dma_device_list);
return NULL;
}
+enum dma_status dma_sync_wait(struct dma_chan *chan, dma_cookie_t cookie)
+{
+ enum dma_status status;
+ unsigned long dma_sync_wait_timeout = jiffies + msecs_to_jiffies(5000);
+
+ dma_async_issue_pending(chan);
+ do {
+ status = dma_async_is_tx_complete(chan, cookie, NULL, NULL);
+ if (time_after_eq(jiffies, dma_sync_wait_timeout)) {
+ printk(KERN_ERR "dma_sync_wait_timeout!\n");
+ return DMA_ERROR;
+ }
+ } while (status == DMA_IN_PROGRESS);
+
+ return status;
+}
+EXPORT_SYMBOL(dma_sync_wait);
+
/**
* dma_chan_cleanup - release a DMA channel's resources
* @kref: kernel reference structure that contains the DMA channel device
chan->client = NULL;
kref_put(&chan->device->refcount, dma_async_device_cleanup);
}
+EXPORT_SYMBOL(dma_chan_cleanup);
static void dma_chan_free_rcu(struct rcu_head *rcu)
{
return client;
}
+EXPORT_SYMBOL(dma_async_client_register);
/**
* dma_async_client_unregister - unregister a client and free the &dma_client
kfree(client);
dma_chans_rebalance();
}
+EXPORT_SYMBOL(dma_async_client_unregister);
/**
* dma_async_client_chan_request - request DMA channels
client->chans_desired = number;
dma_chans_rebalance();
}
+EXPORT_SYMBOL(dma_async_client_chan_request);
/**
* dma_async_device_register - registers DMA devices found
int dma_async_device_register(struct dma_device *device)
{
static int id;
- int chancnt = 0;
+ int chancnt = 0, rc;
struct dma_chan* chan;
if (!device)
return -ENODEV;
+ /* validate device routines */
+ BUG_ON(dma_has_cap(DMA_MEMCPY, device->cap_mask) &&
+ !device->device_prep_dma_memcpy);
+ BUG_ON(dma_has_cap(DMA_XOR, device->cap_mask) &&
+ !device->device_prep_dma_xor);
+ BUG_ON(dma_has_cap(DMA_ZERO_SUM, device->cap_mask) &&
+ !device->device_prep_dma_zero_sum);
+ BUG_ON(dma_has_cap(DMA_MEMSET, device->cap_mask) &&
+ !device->device_prep_dma_memset);
+ BUG_ON(dma_has_cap(DMA_ZERO_SUM, device->cap_mask) &&
+ !device->device_prep_dma_interrupt);
+
+ BUG_ON(!device->device_alloc_chan_resources);
+ BUG_ON(!device->device_free_chan_resources);
+ BUG_ON(!device->device_dependency_added);
+ BUG_ON(!device->device_is_tx_complete);
+ BUG_ON(!device->device_issue_pending);
+ BUG_ON(!device->dev);
+
init_completion(&device->done);
kref_init(&device->refcount);
device->dev_id = id++;
snprintf(chan->class_dev.class_id, BUS_ID_SIZE, "dma%dchan%d",
device->dev_id, chan->chan_id);
+ rc = class_device_register(&chan->class_dev);
+ if (rc) {
+ chancnt--;
+ free_percpu(chan->local);
+ chan->local = NULL;
+ goto err_out;
+ }
+
kref_get(&device->refcount);
- class_device_register(&chan->class_dev);
}
mutex_lock(&dma_list_mutex);
dma_chans_rebalance();
return 0;
+
+err_out:
+ list_for_each_entry(chan, &device->channels, device_node) {
+ if (chan->local == NULL)
+ continue;
+ kref_put(&device->refcount, dma_async_device_cleanup);
+ class_device_unregister(&chan->class_dev);
+ chancnt--;
+ free_percpu(chan->local);
+ }
+ return rc;
}
+EXPORT_SYMBOL(dma_async_device_register);
/**
* dma_async_device_cleanup - function called when all references are released
kref_put(&device->refcount, dma_async_device_cleanup);
wait_for_completion(&device->done);
}
+EXPORT_SYMBOL(dma_async_device_unregister);
+
+/**
+ * dma_async_memcpy_buf_to_buf - offloaded copy between virtual addresses
+ * @chan: DMA channel to offload copy to
+ * @dest: destination address (virtual)
+ * @src: source address (virtual)
+ * @len: length
+ *
+ * Both @dest and @src must be mappable to a bus address according to the
+ * DMA mapping API rules for streaming mappings.
+ * Both @dest and @src must stay memory resident (kernel memory or locked
+ * user space pages).
+ */
+dma_cookie_t
+dma_async_memcpy_buf_to_buf(struct dma_chan *chan, void *dest,
+ void *src, size_t len)
+{
+ struct dma_device *dev = chan->device;
+ struct dma_async_tx_descriptor *tx;
+ dma_addr_t addr;
+ dma_cookie_t cookie;
+ int cpu;
+
+ tx = dev->device_prep_dma_memcpy(chan, len, 0);
+ if (!tx)
+ return -ENOMEM;
+
+ tx->ack = 1;
+ tx->callback = NULL;
+ addr = dma_map_single(dev->dev, src, len, DMA_TO_DEVICE);
+ tx->tx_set_src(addr, tx, 0);
+ addr = dma_map_single(dev->dev, dest, len, DMA_FROM_DEVICE);
+ tx->tx_set_dest(addr, tx, 0);
+ cookie = tx->tx_submit(tx);
+
+ cpu = get_cpu();
+ per_cpu_ptr(chan->local, cpu)->bytes_transferred += len;
+ per_cpu_ptr(chan->local, cpu)->memcpy_count++;
+ put_cpu();
+
+ return cookie;
+}
+EXPORT_SYMBOL(dma_async_memcpy_buf_to_buf);
+
+/**
+ * dma_async_memcpy_buf_to_pg - offloaded copy from address to page
+ * @chan: DMA channel to offload copy to
+ * @page: destination page
+ * @offset: offset in page to copy to
+ * @kdata: source address (virtual)
+ * @len: length
+ *
+ * Both @page/@offset and @kdata must be mappable to a bus address according
+ * to the DMA mapping API rules for streaming mappings.
+ * Both @page/@offset and @kdata must stay memory resident (kernel memory or
+ * locked user space pages)
+ */
+dma_cookie_t
+dma_async_memcpy_buf_to_pg(struct dma_chan *chan, struct page *page,
+ unsigned int offset, void *kdata, size_t len)
+{
+ struct dma_device *dev = chan->device;
+ struct dma_async_tx_descriptor *tx;
+ dma_addr_t addr;
+ dma_cookie_t cookie;
+ int cpu;
+
+ tx = dev->device_prep_dma_memcpy(chan, len, 0);
+ if (!tx)
+ return -ENOMEM;
+
+ tx->ack = 1;
+ tx->callback = NULL;
+ addr = dma_map_single(dev->dev, kdata, len, DMA_TO_DEVICE);
+ tx->tx_set_src(addr, tx, 0);
+ addr = dma_map_page(dev->dev, page, offset, len, DMA_FROM_DEVICE);
+ tx->tx_set_dest(addr, tx, 0);
+ cookie = tx->tx_submit(tx);
+
+ cpu = get_cpu();
+ per_cpu_ptr(chan->local, cpu)->bytes_transferred += len;
+ per_cpu_ptr(chan->local, cpu)->memcpy_count++;
+ put_cpu();
+
+ return cookie;
+}
+EXPORT_SYMBOL(dma_async_memcpy_buf_to_pg);
+
+/**
+ * dma_async_memcpy_pg_to_pg - offloaded copy from page to page
+ * @chan: DMA channel to offload copy to
+ * @dest_pg: destination page
+ * @dest_off: offset in page to copy to
+ * @src_pg: source page
+ * @src_off: offset in page to copy from
+ * @len: length
+ *
+ * Both @dest_page/@dest_off and @src_page/@src_off must be mappable to a bus
+ * address according to the DMA mapping API rules for streaming mappings.
+ * Both @dest_page/@dest_off and @src_page/@src_off must stay memory resident
+ * (kernel memory or locked user space pages).
+ */
+dma_cookie_t
+dma_async_memcpy_pg_to_pg(struct dma_chan *chan, struct page *dest_pg,
+ unsigned int dest_off, struct page *src_pg, unsigned int src_off,
+ size_t len)
+{
+ struct dma_device *dev = chan->device;
+ struct dma_async_tx_descriptor *tx;
+ dma_addr_t addr;
+ dma_cookie_t cookie;
+ int cpu;
+
+ tx = dev->device_prep_dma_memcpy(chan, len, 0);
+ if (!tx)
+ return -ENOMEM;
+
+ tx->ack = 1;
+ tx->callback = NULL;
+ addr = dma_map_page(dev->dev, src_pg, src_off, len, DMA_TO_DEVICE);
+ tx->tx_set_src(addr, tx, 0);
+ addr = dma_map_page(dev->dev, dest_pg, dest_off, len, DMA_FROM_DEVICE);
+ tx->tx_set_dest(addr, tx, 0);
+ cookie = tx->tx_submit(tx);
+
+ cpu = get_cpu();
+ per_cpu_ptr(chan->local, cpu)->bytes_transferred += len;
+ per_cpu_ptr(chan->local, cpu)->memcpy_count++;
+ put_cpu();
+
+ return cookie;
+}
+EXPORT_SYMBOL(dma_async_memcpy_pg_to_pg);
+
+void dma_async_tx_descriptor_init(struct dma_async_tx_descriptor *tx,
+ struct dma_chan *chan)
+{
+ tx->chan = chan;
+ spin_lock_init(&tx->lock);
+ INIT_LIST_HEAD(&tx->depend_node);
+ INIT_LIST_HEAD(&tx->depend_list);
+}
+EXPORT_SYMBOL(dma_async_tx_descriptor_init);
static int __init dma_bus_init(void)
{
mutex_init(&dma_list_mutex);
return class_register(&dma_devclass);
}
-
subsys_initcall(dma_bus_init);
-EXPORT_SYMBOL(dma_async_client_register);
-EXPORT_SYMBOL(dma_async_client_unregister);
-EXPORT_SYMBOL(dma_async_client_chan_request);
-EXPORT_SYMBOL(dma_async_memcpy_buf_to_buf);
-EXPORT_SYMBOL(dma_async_memcpy_buf_to_pg);
-EXPORT_SYMBOL(dma_async_memcpy_pg_to_pg);
-EXPORT_SYMBOL(dma_async_memcpy_complete);
-EXPORT_SYMBOL(dma_async_memcpy_issue_pending);
-EXPORT_SYMBOL(dma_async_device_register);
-EXPORT_SYMBOL(dma_async_device_unregister);
-EXPORT_SYMBOL(dma_chan_cleanup);
git.openpandora.org / pandora-kernel.git / blobdiff