On Wed, 2 Mar 2022 at 17:31, Cédric Le Goater <clg@xxxxxxxx> wrote: > > This SPI driver adds support for the Aspeed static memory controllers > of the AST2600, AST2500 and AST2400 SoCs using the spi-mem interface. > > * AST2600 Firmware SPI Memory Controller (FMC) > . BMC firmware > . 3 chip select pins (CE0 ~ CE2) > . Only supports SPI type flash memory > . different segment register interface > . single, dual and quad mode. > > * AST2600 SPI Flash Controller (SPI1 and SPI2) > . host firmware > . 2 chip select pins (CE0 ~ CE1) > . different segment register interface > . single, dual and quad mode. > > * AST2500 Firmware SPI Memory Controller (FMC) > . BMC firmware > . 3 chip select pins (CE0 ~ CE2) > . supports SPI type flash memory (CE0-CE1) > . CE2 can be of NOR type flash but this is not supported by the driver > . single, dual mode. > > * AST2500 SPI Flash Controller (SPI1 and SPI2) > . host firmware > . 2 chip select pins (CE0 ~ CE1) > . single, dual mode. > > * AST2400 New Static Memory Controller (also referred as FMC) > . BMC firmware > . New register set > . 5 chip select pins (CE0 ∼ CE4) > . supports NOR flash, NAND flash and SPI flash memory. > . single, dual and quad mode. > > Each controller has a memory range on which flash devices contents are > mapped. Each device is assigned a window that can be changed at bootime > with the Segment Address Registers. > > Each SPI flash device can then be accessed in two modes: Command and > User. When in User mode, SPI transfers are initiated with accesses to > the memory segment of a device. When in Command mode, memory > operations on the memory segment of a device generate SPI commands > automatically using a Control Register for the settings. > > This initial patch adds support for User mode. Command mode needs a little > more work to check that the memory window on the AHB bus fits the device > size. It will come later when support for direct mapping is added. > > Single and dual mode RX transfers are supported. Other types than SPI > are not supported. > > Signed-off-by: Chin-Ting Kuo <chin-ting_kuo@xxxxxxxxxxxxxx> > Signed-off-by: Cédric Le Goater <clg@xxxxxxxx> Reviewed-by: Joel Stanley <joel@xxxxxxxxx>
