• Masahiro Yamada's avatar
    mtd: nand: denali: avoid magic numbers and rename for clarification · 0d3a966d
    Masahiro Yamada authored
    Introduce some macros and helpers to avoid magic numbers and
    rename macros/functions for clarification.
    
    - We see '| 2' in several places.  This means Data Cycle in MAP11 mode.
      The Denali User's Guide says bit[1:0] of MAP11 is like follows:
    
      b'00 = Command Cycle
      b'01 = Address Cycle
      b'10 = Data Cycle
    
      So, this commit added DENALI_MAP11_{CMD,ADDR,DATA} macros.
    
    - We see 'denali->flash_mem + 0x10' in several places, but 0x10 is a
      magic number.  Actually, this accesses the data port of the Host
      Data/Command Interface.  So, this commit added DENALI_HOST_DATA.
      On the other hand, 'denali->flash_mem' gets access to the address
      port, so DENALI_HOST_ADDR was also added.
    
    - We see 'index_addr(denali, cmd, 0x1)' in denali_erase(), but 0x1
      is a magic number.  0x1 means the erase operation.  Replace 0x1
      with DENALI_ERASE.
    
    - Rename index_addr() to denali_host_write() for clarification
    
    - Denali User's Guide says MAP{00,01,10,11} for access mode.  Match
      the macros with terminology in the IP document.
    
    - Rename struct members as follows:
      flash_bank   -> active_bank    (currently selected bank)
      flash_reg    -> reg            (base address of registers)
      flash_mem    -> host           (base address of host interface)
      devnum       -> devs_per_cs    (devices connected in parallel)
      bbtskipbytes -> oob_skip_bytes (number of bytes to skip in OOB)
    Signed-off-by: default avatarMasahiro Yamada <yamada.masahiro@socionext.com>
    Signed-off-by: default avatarBoris Brezillon <boris.brezillon@free-electrons.com>
    0d3a966d
denali_dt.c 4.01 KB