1 This patch rewrites the miiphybb ( Bit-banged MII bus driver ) in order to 2 support an arbitrary number of mii buses. This feature is useful when your 3 board uses different mii buses for different phys and all (or a part) of these 4 buses are implemented via bit-banging mode. 5 6 The driver requires that the following macros should be defined into the board 7 configuration file: 8 9 CONFIG_BITBANGMII - Enable the miiphybb driver 10 CONFIG_BITBANGMII_MULTI - Enable the multi bus support 11 12 If the CONFIG_BITBANGMII_MULTI is not defined, the board's config file needs 13 to define at least the following macros: 14 15 MII_INIT - Generic code to enable the MII bus (optional) 16 MDIO_DECLARE - Declaration needed to access to the MDIO pin (optional) 17 MDIO_ACTIVE - Activate the MDIO pin as out pin 18 MDIO_TRISTATE - Activate the MDIO pin as input/tristate pin 19 MDIO_READ - Read the MDIO pin 20 MDIO(v) - Write v on the MDIO pin 21 MDC_DECLARE - Declaration needed to access to the MDC pin (optional) 22 MDC(v) - Write v on the MDC pin 23 24 The previous macros make the driver compatible with the previous version 25 (that didn't support the multi-bus). 26 27 When the CONFIG_BITBANGMII_MULTI is also defined, the board code needs to fill 28 the bb_miiphy_buses[] array with a record for each required bus and declare 29 the bb_miiphy_buses_num variable with the number of mii buses. 30 The record (struct bb_miiphy_bus) has the following fields/callbacks (see 31 miiphy.h for details): 32 33 char name[] - The symbolic name that must be equal to the MII bus 34 registered name 35 int (*init)() - Initialization function called at startup time (just 36 before the Ethernet initialization) 37 int (*mdio_active)() - Activate the MDIO pin as output 38 int (*mdio_tristate)() - Activate the MDIO pin as input/tristate pin 39 int (*set_mdio)() - Write the MDIO pin 40 int (*get_mdio)() - Read the MDIO pin 41 int (*set_mdc)() - Write the MDC pin 42 int (*delay)() - Delay function 43 void *priv - Private data used by board specific code 44 45 The board code will look like: 46 47 struct bb_miiphy_bus bb_miiphy_buses[] = { 48 { .name = "miibus#1", .init = b1_init, .mdio_active = b1_mdio_active, ... }, 49 { .name = "miibus#2", .init = b2_init, .mdio_active = b2_mdio_active, ... }, 50 ... 51 }; 52 int bb_miiphy_buses_num = sizeof(bb_miiphy_buses) / 53 sizeof(bb_miiphy_buses[0]); 54 55 2009 Industrie Dial Face S.p.A. 56 Luigi 'Comio' Mantellini <luigi.mantellini (a] idf-hit.com> 57
