• Benjamin Herrenschmidt's avatar
    usb/uhci: Add support for Aspeed BMC SoCs · 4642d34a
    Benjamin Herrenschmidt authored
    The Aspeed 2400/2500 families have a variant of UHCI which requires
    some quirks to the driver to work:
    
     - The register offsets are different. We add a remapping helper.
    
     - All accesses have to be done via 32-bit loads and stores. We
       force all accessors to use readl/writel. This is of no consequence
       for reads as we never read "in the middle" of a register. For writes
       it also works fine as the registers only actually implement the bits
       we try to write (16-bit for the registers accessed with writew and
       8-bit for the register accessed with writeb), so always using a
       32-bit write will have no negative effect. We never do partial writes.
    
     - The resume detect interrupt is broken
    
     - The number of ports is (optionally) provided via the device-tree
    Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
    Acked-by: default avatarAlan Stern <stern@rowland.harvard.edu>
    --
    
    v2. Remove the bulk of the #ifdef's
    
     drivers/usb/host/Kconfig         |  6 ++++-
     drivers/usb/host/uhci-hcd.c      | 17 +++++++++++---
     drivers/usb/host/uhci-hcd.h      | 51 ++++++++++++++++++++++++++++++++++++++++
     drivers/usb/host/uhci-platform.c | 22 ++++++++++++++++-
     4 files changed, 91 insertions(+), 5 deletions(-)
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
    4642d34a
uhci-hcd.h 22.2 KB