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>
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@ -1140,6 +1140,15 @@ static void handle_registers(struct fw_card *card, struct fw_request *request,
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rcode = RCODE_TYPE_ERROR;
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break;
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case CSR_MAINT_UTILITY:
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if (tcode == TCODE_READ_QUADLET_REQUEST)
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*data = card->maint_utility_register;
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else if (tcode == TCODE_WRITE_QUADLET_REQUEST)
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card->maint_utility_register = *data;
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else
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rcode = RCODE_TYPE_ERROR;
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break;
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case CSR_BROADCAST_CHANNEL:
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if (tcode == TCODE_READ_QUADLET_REQUEST)
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*data = cpu_to_be32(card->broadcast_channel);
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@ -38,6 +38,7 @@
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#define CSR_CHANNELS_AVAILABLE 0x224
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#define CSR_CHANNELS_AVAILABLE_HI 0x224
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#define CSR_CHANNELS_AVAILABLE_LO 0x228
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#define CSR_MAINT_UTILITY 0x230
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#define CSR_BROADCAST_CHANNEL 0x234
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#define CSR_CONFIG_ROM 0x400
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#define CSR_CONFIG_ROM_END 0x800
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@ -122,6 +123,8 @@ struct fw_card {
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bool broadcast_channel_allocated;
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u32 broadcast_channel;
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__be32 topology_map[(CSR_TOPOLOGY_MAP_END - CSR_TOPOLOGY_MAP) / 4];
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__be32 maint_utility_register;
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};
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struct fw_attribute_group {
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