Changeset e67c50a in mainline for uspace/drv/bus/usb/ohci/ohci_batch.h

Timestamp:

2018-02-01T21:13:23Z (6 years ago)

Author:

Ondřej Hlavatý <aearsis@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

64ce0c1

Parents:

3e6ff9a

git-author:

Ondřej Hlavatý <aearsis@…> (2018-02-01 21:13:22)

git-committer:

Ondřej Hlavatý <aearsis@…> (2018-02-01 21:13:23)

Message:

ohci: use dma memory responsibly

Instead of leaving arbitrary TD behind to be used by next transfer,
prepare two of them in endpoint and use them in a cyclic manner. This
reduces the number of pages allocated per transfer to one.

File:

• uspace/drv/bus/usb/ohci/ohci_batch.h (modified) (2 diffs)

uspace/drv/bus/usb/ohci/ohci_batch.h

@@ -38 +38 @@
 #include <assert.h>
 #include <stdbool.h>
+#include <usb/dma_buffer.h>
 #include <usb/host/usb_transfer_batch.h>
 
@@ -47 +48 @@
         usb_transfer_batch_t base;
 
-        /** Endpoint descriptor of the target endpoint. */
-        ed_t *ed;
-        /** List of TDs needed for the transfer */
-        td_t **tds;
         /** Number of TDs used by the transfer */
         size_t td_count;
-        /** Data buffer, must be accessible by the OHCI hw. */
-        char *device_buffer;
+
+        /**
+         * List of TDs needed for the transfer - together with setup data
+         * backed by the dma buffer. Note that the TD pointers are pointing to
+         * the DMA buffer initially, but as the scheduling must use the first TD
+         * from EP, it is replaced.
+         */
+        td_t **tds;
+        char *setup_buffer;
+        char *data_buffer;
+
+        dma_buffer_t ohci_dma_buffer;
 } ohci_transfer_batch_t;