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Commit 3d1f46eb authored by Clemens Ladisch's avatar Clemens Ladisch
Browse files

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: default avatarClemens Ladisch <clemens@ladisch.de>
parent a1a1132b

drivers/firewire/core-transaction.c

+9 −0
Original line number Diff line number Diff line
@@ -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);

include/linux/firewire.h

+3 −0
Original line number Diff line number Diff line
@@ -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 {