• Vivien Didelot's avatar
    net: dsa: mv88e6xxx: abstract switch registers accesses · 914b32f6
    Vivien Didelot authored
    When the SMI address of the switch chip is zero, the chip assumes to be
    the only one on the SMI master bus and thus responds to all its known
    SMI devices addresses (port registers, Global2, etc.)
    
    When its SMI address is not zero, some chips (e.g. 88E6352) use an
    indirect access through two SMI Command and Data registers.
    
    Other models (e.g. 88E6060) using less than 16 internal SMI addresses
    always use a direct access.
    
    Add a capability flag to describe chips supporting the (indirect)
    Multi-chip Addressing Mode, and a low-level API to access the registers
    via SMI.
    
    Other accesses (like Ethernet management frames) may be added later.
    Signed-off-by: default avatarVivien Didelot <vivien.didelot@savoirfairelinux.com>
    Reviewed-by: default avatarAndrew Lunn <andrew@lunn.ch>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    914b32f6
mv88e6xxx.c 92.6 KB