1*4882a593SmuzhiyunThis patch rewrites the miiphybb ( Bit-banged MII bus driver ) in order to 2*4882a593Smuzhiyunsupport an arbitrary number of mii buses. This feature is useful when your 3*4882a593Smuzhiyunboard uses different mii buses for different phys and all (or a part) of these 4*4882a593Smuzhiyunbuses are implemented via bit-banging mode. 5*4882a593Smuzhiyun 6*4882a593SmuzhiyunThe driver requires that the following macros should be defined into the board 7*4882a593Smuzhiyunconfiguration file: 8*4882a593Smuzhiyun 9*4882a593SmuzhiyunCONFIG_BITBANGMII - Enable the miiphybb driver 10*4882a593SmuzhiyunCONFIG_BITBANGMII_MULTI - Enable the multi bus support 11*4882a593Smuzhiyun 12*4882a593SmuzhiyunIf the CONFIG_BITBANGMII_MULTI is not defined, the board's config file needs 13*4882a593Smuzhiyunto define at least the following macros: 14*4882a593Smuzhiyun 15*4882a593SmuzhiyunMII_INIT - Generic code to enable the MII bus (optional) 16*4882a593SmuzhiyunMDIO_DECLARE - Declaration needed to access to the MDIO pin (optional) 17*4882a593SmuzhiyunMDIO_ACTIVE - Activate the MDIO pin as out pin 18*4882a593SmuzhiyunMDIO_TRISTATE - Activate the MDIO pin as input/tristate pin 19*4882a593SmuzhiyunMDIO_READ - Read the MDIO pin 20*4882a593SmuzhiyunMDIO(v) - Write v on the MDIO pin 21*4882a593SmuzhiyunMDC_DECLARE - Declaration needed to access to the MDC pin (optional) 22*4882a593SmuzhiyunMDC(v) - Write v on the MDC pin 23*4882a593Smuzhiyun 24*4882a593SmuzhiyunThe previous macros make the driver compatible with the previous version 25*4882a593Smuzhiyun(that didn't support the multi-bus). 26*4882a593Smuzhiyun 27*4882a593SmuzhiyunWhen the CONFIG_BITBANGMII_MULTI is also defined, the board code needs to fill 28*4882a593Smuzhiyunthe bb_miiphy_buses[] array with a record for each required bus and declare 29*4882a593Smuzhiyunthe bb_miiphy_buses_num variable with the number of mii buses. 30*4882a593SmuzhiyunThe record (struct bb_miiphy_bus) has the following fields/callbacks (see 31*4882a593Smuzhiyunmiiphy.h for details): 32*4882a593Smuzhiyun 33*4882a593Smuzhiyunchar name[] - The symbolic name that must be equal to the MII bus 34*4882a593Smuzhiyun registered name 35*4882a593Smuzhiyunint (*init)() - Initialization function called at startup time (just 36*4882a593Smuzhiyun before the Ethernet initialization) 37*4882a593Smuzhiyunint (*mdio_active)() - Activate the MDIO pin as output 38*4882a593Smuzhiyunint (*mdio_tristate)() - Activate the MDIO pin as input/tristate pin 39*4882a593Smuzhiyunint (*set_mdio)() - Write the MDIO pin 40*4882a593Smuzhiyunint (*get_mdio)() - Read the MDIO pin 41*4882a593Smuzhiyunint (*set_mdc)() - Write the MDC pin 42*4882a593Smuzhiyunint (*delay)() - Delay function 43*4882a593Smuzhiyunvoid *priv - Private data used by board specific code 44*4882a593Smuzhiyun 45*4882a593SmuzhiyunThe board code will look like: 46*4882a593Smuzhiyun 47*4882a593Smuzhiyunstruct bb_miiphy_bus bb_miiphy_buses[] = { 48*4882a593Smuzhiyun { .name = "miibus#1", .init = b1_init, .mdio_active = b1_mdio_active, ... }, 49*4882a593Smuzhiyun { .name = "miibus#2", .init = b2_init, .mdio_active = b2_mdio_active, ... }, 50*4882a593Smuzhiyun ... 51*4882a593Smuzhiyun}; 52*4882a593Smuzhiyunint bb_miiphy_buses_num = sizeof(bb_miiphy_buses) / 53*4882a593Smuzhiyun sizeof(bb_miiphy_buses[0]); 54*4882a593Smuzhiyun 55*4882a593Smuzhiyun2009 Industrie Dial Face S.p.A. 56*4882a593Smuzhiyun Luigi 'Comio' Mantellini <luigi.mantellini@idf-hit.com> 57