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firewire: add CSR PRIORITY_BUDGET support

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If supported by the OHCI controller, implement the PRIORITY_BUDGET
register, which is required for nodes that can use asynchronous
priority arbitration.

To allow the core to determine what features the lowlevel device
supports, add a new card driver callback.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
This commit is contained in:
Clemens Ladisch
2010-06-10 08:35:06 +02:00
parent 27a2329f82
commit a1a1132bd8
4 changed files with 46 additions and 0 deletions
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14
drivers/firewire/core-transaction.c
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@@ -1126,6 +1126,20 @@ static void handle_registers(struct fw_card *card, struct fw_request *request,
rcode = RCODE_TYPE_ERROR;
break;
case CSR_PRIORITY_BUDGET:
if (!(card->driver->get_features(card) &
FEATURE_PRIORITY_BUDGET))
rcode = RCODE_ADDRESS_ERROR;
else if (tcode == TCODE_READ_QUADLET_REQUEST)
*data = cpu_to_be32(card->driver->
read_csr_reg(card, CSR_PRIORITY_BUDGET));
else if (tcode == TCODE_WRITE_QUADLET_REQUEST)
card->driver->write_csr_reg(card, CSR_PRIORITY_BUDGET,
be32_to_cpu(*data));
else
rcode = RCODE_TYPE_ERROR;
break;
case CSR_BROADCAST_CHANNEL:
if (tcode == TCODE_READ_QUADLET_REQUEST)
*data = cpu_to_be32(card->broadcast_channel);