/** * Keep-Warm (KW) buffer base address. * * Driver must allocate a 4KByte buffer that is for keeping the * host DRAM powered on (via dummy accesses to DRAM) to maintain low-latency * DRAM access when doing Txing or Rxing. The dummy accesses prevent host * from going into a power-savings mode that would cause higher DRAM latency, * and possible data over/under-runs, before all Tx/Rx is complete. * * Driver loads IWM_FH_KW_MEM_ADDR_REG with the physical address (bits 35:4) * of the buffer, which must be 4K aligned. Once this is set up, the device * automatically invokes keep-warm accesses when normal accesses might not * be sufficient to maintain fast DRAM response. * * Bit fields: * 31-0: Keep-warm buffer physical base address [35:4], must be 4K aligned */