Device tree aware EMAC driver
Based on BenH's earlier work, this is a new version of the EMAC driver
for the built-in ethernet found on PowerPC 4xx embedded CPUs. The
same ASIC is also found in the Axon bridge chip. This new version is
designed to work in the arch/powerpc tree, using the device tree to
probe the device, rather than the old and ugly arch/ppc OCP layer.
This driver is designed to sit alongside the old driver (that lies in
drivers/net/ibm_emac and this one in drivers/net/ibm_newemac). The
old driver is left in place to support arch/ppc until arch/ppc itself
reaches its final demise (not too long now, with luck).
This driver still has a number of things that could do with cleaning
up, but I think they can be fixed up after merging. Specifically:
- Should be adjusted to properly use the dma mapping API.
Axon needs this.
- Probe logic needs reworking, in conjuction with the general
probing code for of_platform devices. The dependencies here between
EMAC, MAL, ZMII etc. make this complicated. At present, it usually
works, because we initialize and register the sub-drivers before the
EMAC driver itself, and (being in driver code) runs after the devices
themselves have been instantiated from the device tree.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
2007-08-23 03:56:01 +00:00
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config IBM_NEW_EMAC
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tristate "IBM EMAC Ethernet support"
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depends on PPC_DCR && PPC_MERGE
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2008-06-17 23:27:55 +00:00
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select CRC32
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Device tree aware EMAC driver
Based on BenH's earlier work, this is a new version of the EMAC driver
for the built-in ethernet found on PowerPC 4xx embedded CPUs. The
same ASIC is also found in the Axon bridge chip. This new version is
designed to work in the arch/powerpc tree, using the device tree to
probe the device, rather than the old and ugly arch/ppc OCP layer.
This driver is designed to sit alongside the old driver (that lies in
drivers/net/ibm_emac and this one in drivers/net/ibm_newemac). The
old driver is left in place to support arch/ppc until arch/ppc itself
reaches its final demise (not too long now, with luck).
This driver still has a number of things that could do with cleaning
up, but I think they can be fixed up after merging. Specifically:
- Should be adjusted to properly use the dma mapping API.
Axon needs this.
- Probe logic needs reworking, in conjuction with the general
probing code for of_platform devices. The dependencies here between
EMAC, MAL, ZMII etc. make this complicated. At present, it usually
works, because we initialize and register the sub-drivers before the
EMAC driver itself, and (being in driver code) runs after the devices
themselves have been instantiated from the device tree.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
2007-08-23 03:56:01 +00:00
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help
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This driver supports the IBM EMAC family of Ethernet controllers
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typically found on 4xx embedded PowerPC chips, but also on the
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Axon southbridge for Cell.
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config IBM_NEW_EMAC_RXB
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int "Number of receive buffers"
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depends on IBM_NEW_EMAC
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default "128"
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config IBM_NEW_EMAC_TXB
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int "Number of transmit buffers"
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depends on IBM_NEW_EMAC
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default "64"
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config IBM_NEW_EMAC_POLL_WEIGHT
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int "MAL NAPI polling weight"
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depends on IBM_NEW_EMAC
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default "32"
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config IBM_NEW_EMAC_RX_COPY_THRESHOLD
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int "RX skb copy threshold (bytes)"
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depends on IBM_NEW_EMAC
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default "256"
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config IBM_NEW_EMAC_RX_SKB_HEADROOM
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int "Additional RX skb headroom (bytes)"
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depends on IBM_NEW_EMAC
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default "0"
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help
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Additional receive skb headroom. Note, that driver
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will always reserve at least 2 bytes to make IP header
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aligned, so usually there is no need to add any additional
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headroom.
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If unsure, set to 0.
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config IBM_NEW_EMAC_DEBUG
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bool "Debugging"
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depends on IBM_NEW_EMAC
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default n
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# The options below has to be select'ed by the respective
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# processor types or platforms
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config IBM_NEW_EMAC_ZMII
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bool
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default n
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config IBM_NEW_EMAC_RGMII
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bool
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default n
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config IBM_NEW_EMAC_TAH
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bool
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default n
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config IBM_NEW_EMAC_EMAC4
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bool
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default n
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