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Diffstat (limited to 'qemu/roms/u-boot/doc/README.bitbangMII')
| -rw-r--r-- | qemu/roms/u-boot/doc/README.bitbangMII | 56 |
1 files changed, 0 insertions, 56 deletions
diff --git a/qemu/roms/u-boot/doc/README.bitbangMII b/qemu/roms/u-boot/doc/README.bitbangMII deleted file mode 100644 index 0a2fa48a5..000000000 --- a/qemu/roms/u-boot/doc/README.bitbangMII +++ /dev/null @@ -1,56 +0,0 @@ -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> |