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firewire: add CSR CYCLE_TIME write support 

The specification requires that CYCLE_TIME is writable so that it can be
initialized, so we better implement it.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
This commit is contained in:
Clemens Ladisch 2010-06-10 08:26:48 +02:00
parent 8e4b50f94e
commit 9ab5071cd4
2 changed files with 10 additions and 0 deletions
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3
drivers/firewire/core-transaction.c
View File

@ -1097,6 +1097,9 @@ static void handle_registers(struct fw_card *card, struct fw_request *request,
if (TCODE_IS_READ_REQUEST(tcode) && length == 4)
*data = cpu_to_be32(card->driver->
read_csr_reg(card, CSR_CYCLE_TIME));
else if (tcode == TCODE_WRITE_QUADLET_REQUEST)
card->driver->write_csr_reg(card, CSR_CYCLE_TIME,
be32_to_cpu(*data));
else
rcode = RCODE_TYPE_ERROR;
break;

7
drivers/firewire/ohci.c
View File

@ -1996,6 +1996,13 @@ static void ohci_write_csr_reg(struct fw_card *card, int csr_offset, u32 value)
flush_writes(ohci);
break;
case CSR_CYCLE_TIME:
reg_write(ohci, OHCI1394_IsochronousCycleTimer, value);
reg_write(ohci, OHCI1394_IntEventSet,
OHCI1394_cycleInconsistent);
flush_writes(ohci);
break;
default:
WARN_ON(1);
break;