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