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firewire: implement asynchronous stream transmission

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Allow userspace and other firewire drivers (fw-ipv4 I'm looking at
you!) to send Asynchronous Transmit Streams as described in 7.8.3 of
release 1.1 of the 1394 Open Host Controller Interface Specification.

Signed-off-by: Jay Fenlason <fenlason@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> (tweaks)
This commit is contained in:
Jay Fenlason
2009-03-05 19:08:40 +01:00
committed by Stefan Richter
parent ba27e1f7bf
commit f8c2287c65
5 changed files with 108 additions and 2 deletions
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21
drivers/firewire/fw-ohci.c
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@@ -936,7 +936,9 @@ static int at_context_queue_packet(struct context *ctx,
*/
header = (__le32 *) &d[1];
if (packet->header_length > 8) {
switch (packet->header_length) {
case 16:
case 12:
header[0] = cpu_to_le32((packet->header[0] & 0xffff) |
(packet->speed << 16));
header[1] = cpu_to_le32((packet->header[1] & 0xffff) |
@@ -950,12 +952,27 @@ static int at_context_queue_packet(struct context *ctx,
header[3] = (__force __le32) packet->header[3];
d[0].req_count = cpu_to_le16(packet->header_length);
} else {
break;
case 8:
header[0] = cpu_to_le32((OHCI1394_phy_tcode << 4) |
(packet->speed << 16));
header[1] = cpu_to_le32(packet->header[0]);
header[2] = cpu_to_le32(packet->header[1]);
d[0].req_count = cpu_to_le16(12);
break;
case 4:
header[0] = cpu_to_le32((packet->header[0] & 0xffff) |
(packet->speed << 16));
header[1] = cpu_to_le32(packet->header[0] & 0xffff0000);
d[0].req_count = cpu_to_le16(8);
break;
default:
/* BUG(); */
packet->ack = RCODE_SEND_ERROR;
return -1;
}
driver_data = (struct driver_data *) &d[3];