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firewire: core: add CSR MAINT_UTILITY support 

Implement the MAIN_UTILITY register, which is utterly optional
but useful as a safe target for diagnostic read/write/broadcast
transactions.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
This commit is contained in:
Clemens Ladisch 2010-06-10 08:35:37 +02:00
parent a1a1132bd8
commit 3d1f46eb60
2 changed files with 12 additions and 0 deletions
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9
drivers/firewire/core-transaction.c
View File

@ -1140,6 +1140,15 @@ static void handle_registers(struct fw_card *card, struct fw_request *request,
rcode = RCODE_TYPE_ERROR;
break;
case CSR_MAINT_UTILITY:
if (tcode == TCODE_READ_QUADLET_REQUEST)
*data = card->maint_utility_register;
else if (tcode == TCODE_WRITE_QUADLET_REQUEST)
card->maint_utility_register = *data;
else
rcode = RCODE_TYPE_ERROR;
break;
case CSR_BROADCAST_CHANNEL:
if (tcode == TCODE_READ_QUADLET_REQUEST)
*data = cpu_to_be32(card->broadcast_channel);

3
include/linux/firewire.h
View File

@ -38,6 +38,7 @@
#define CSR_CHANNELS_AVAILABLE 0x224
#define CSR_CHANNELS_AVAILABLE_HI 0x224
#define CSR_CHANNELS_AVAILABLE_LO 0x228
#define CSR_MAINT_UTILITY 0x230
#define CSR_BROADCAST_CHANNEL 0x234
#define CSR_CONFIG_ROM 0x400
#define CSR_CONFIG_ROM_END 0x800
@ -122,6 +123,8 @@ struct fw_card {
bool broadcast_channel_allocated;
u32 broadcast_channel;
__be32 topology_map[(CSR_TOPOLOGY_MAP_END - CSR_TOPOLOGY_MAP) / 4];
__be32 maint_utility_register;
};
struct fw_attribute_group {