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https://github.com/AsahiLinux/u-boot
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56 lines
2.4 KiB
Text
56 lines
2.4 KiB
Text
This patch rewrites the miiphybb ( Bit-banged MII bus driver ) in order to
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support an arbitrary number of mii buses. This feature is useful when your
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board uses different mii buses for different phys and all (or a part) of these
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buses are implemented via bit-banging mode.
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The driver requires that the following macros should be defined into the board
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configuration file:
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CONFIG_BITBANGMII - Enable the miiphybb driver
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CONFIG_BITBANGMII_MULTI - Enable the multi bus support
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If the CONFIG_BITBANGMII_MULTI is not defined, the board's config file needs
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to define at least the following macros:
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MII_INIT - Generic code to enable the MII bus (optional)
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MDIO_DECLARE - Declaration needed to access to the MDIO pin (optional)
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MDIO_ACTIVE - Activate the MDIO pin as out pin
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MDIO_TRISTATE - Activate the MDIO pin as input/tristate pin
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MDIO_READ - Read the MDIO pin
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MDIO(v) - Write v on the MDIO pin
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MDC_DECLARE - Declaration needed to access to the MDC pin (optional)
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MDC(v) - Write v on the MDC pin
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The previous macros make the driver compatible with the previous version
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(that didn't support the multi-bus).
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When the CONFIG_BITBANGMII_MULTI is also defined, the board code needs to fill
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the bb_miiphy_buses[] array with a record for each required bus and declare
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the bb_miiphy_buses_num variable with the number of mii buses.
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The record (struct bb_miiphy_bus) has the following fields/callbacks (see
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miiphy.h for details):
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char name[] - The symbolic name that must be equal to the MII bus
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registered name
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int (*init)() - Initialization function called at startup time (just
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before the Ethernet initialization)
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int (*mdio_active)() - Activate the MDIO pin as output
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int (*mdio_tristate)() - Activate the MDIO pin as input/tristate pin
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int (*set_mdio)() - Write the MDIO pin
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int (*get_mdio)() - Read the MDIO pin
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int (*set_mdc)() - Write the MDC pin
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int (*delay)() - Delay function
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void *priv - Private data used by board specific code
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The board code will look like:
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struct bb_miiphy_bus bb_miiphy_buses[] = {
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{ .name = "miibus#1", .init = b1_init, .mdio_active = b1_mdio_active, ... },
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{ .name = "miibus#2", .init = b2_init, .mdio_active = b2_mdio_active, ... },
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...
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};
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int bb_miiphy_buses_num = sizeof(bb_miiphy_buses) /
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sizeof(bb_miiphy_buses[0]);
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2009 Industrie Dial Face S.p.A.
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Luigi 'Comio' Mantellini <luigi.mantellini@idf-hit.com>
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