firewire: add CSR BUSY_TIMEOUT support

Implement the BUSY_TIMEOUT register, which is required for nodes that
support retries.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>

1 files changed, 11 insertions, 3 deletions

diff --git a/drivers/firewire/core-transaction.c b/drivers/firewire/core-transaction.c
index 2a390726fa76..8146133818dc 100644
--- a/drivers/firewire/core-transaction.c
+++ b/drivers/firewire/core-transaction.c
@@ -1115,6 +1115,17 @@ static void handle_registers(struct fw_card *card, struct fw_request *request,
                         rcode = RCODE_TYPE_ERROR;
                 break;
 
+        case CSR_BUSY_TIMEOUT:
+                if (tcode == TCODE_READ_QUADLET_REQUEST)
+                        *data = cpu_to_be32(card->driver->
+                                        read_csr_reg(card, CSR_BUSY_TIMEOUT));
+                else if (tcode == TCODE_WRITE_QUADLET_REQUEST)
+                        card->driver->write_csr_reg(card, CSR_BUSY_TIMEOUT,
+                                                    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);
@@ -1140,9 +1151,6 @@ static void handle_registers(struct fw_card *card, struct fw_request *request,
                 BUG();
                 break;
 
-        case CSR_BUSY_TIMEOUT:
-                /* FIXME: Implement this. */
-
         default:
                 rcode = RCODE_ADDRESS_ERROR;
                 break;