firewire: core: combine some repeated code

All of these CSRs have the same read/ write/ aynthing-else handling,
except for CSR_PRIORITY_BUDGET which might not be implemented.

The CSR_CYCLE_TIME read handler implementation accepted 4-byte-sized
block write requests before this change but this is just silly; the
register is only required to support quadlet read and write requests
like the other r/w CSR core and Serial-Bus-dependent registers.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

diff --git a/drivers/firewire/core-transaction.c b/drivers/firewire/core-transaction.c
index 87d69cd..b8f6db6 100644 (file)
--- a/drivers/firewire/core-transaction.c
+++ b/drivers/firewire/core-transaction.c
@@ -1006,38 +1006,30 @@ static void handle_registers(struct fw_card *card, struct fw_request *request,
        unsigned long flags;
 
        switch (reg) {
-       case CSR_STATE_CLEAR:
-               if (tcode == TCODE_READ_QUADLET_REQUEST)
-                       *data = cpu_to_be32(card->driver->
-                                       read_csr_reg(card, CSR_STATE_CLEAR));
-               else if (tcode == TCODE_WRITE_QUADLET_REQUEST)
-                       card->driver->write_csr_reg(card, CSR_STATE_CLEAR,
-                                                   be32_to_cpu(*data));
-               else
-                       rcode = RCODE_TYPE_ERROR;
-               break;
-
-       case CSR_STATE_SET:
-               if (tcode == TCODE_READ_QUADLET_REQUEST)
-                       *data = cpu_to_be32(card->driver->
-                                       read_csr_reg(card, CSR_STATE_SET));
-               else if (tcode == TCODE_WRITE_QUADLET_REQUEST)
-                       card->driver->write_csr_reg(card, CSR_STATE_SET,
-                                                   be32_to_cpu(*data));
-               else
-                       rcode = RCODE_TYPE_ERROR;
-               break;
+       case CSR_PRIORITY_BUDGET:
+               if (!card->priority_budget_implemented) {
+                       rcode = RCODE_ADDRESS_ERROR;
+                       break;
+               }
+               /* else fall through */
 
        case CSR_NODE_IDS:
                /*
                 * per IEEE 1394-2008 8.3.22.3, not IEEE 1394.1-2004 3.2.8
                 * and 9.6, but interoperable with IEEE 1394.1-2004 bridges
                 */
+               /* fall through */
+
+       case CSR_STATE_CLEAR:
+       case CSR_STATE_SET:
+       case CSR_CYCLE_TIME:
+       case CSR_BUS_TIME:
+       case CSR_BUSY_TIMEOUT:
                if (tcode == TCODE_READ_QUADLET_REQUEST)
                        *data = cpu_to_be32(card->driver->
-                                       read_csr_reg(card, CSR_NODE_IDS));
+                                           read_csr_reg(card, reg));
                else if (tcode == TCODE_WRITE_QUADLET_REQUEST)
-                       card->driver->write_csr_reg(card, CSR_NODE_IDS,
+                       card->driver->write_csr_reg(card, reg,
                                                    be32_to_cpu(*data));
                else
                        rcode = RCODE_TYPE_ERROR;
@@ -1078,52 +1070,6 @@ static void handle_registers(struct fw_card *card, struct fw_request *request,
                }
                break;
 
-       case CSR_CYCLE_TIME:
-               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;
-
-       case CSR_BUS_TIME:
-               if (tcode == TCODE_READ_QUADLET_REQUEST)
-                       *data = cpu_to_be32(card->driver->
-                                       read_csr_reg(card, CSR_BUS_TIME));
-               else if (tcode == TCODE_WRITE_QUADLET_REQUEST)
-                       card->driver->write_csr_reg(card, CSR_BUS_TIME,
-                                                   be32_to_cpu(*data));
-               else
-                       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_PRIORITY_BUDGET:
-               if (!card->priority_budget_implemented)
-                       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_MAINT_UTILITY:
                if (tcode == TCODE_READ_QUADLET_REQUEST)
                        *data = card->maint_utility_register;