#define AHCI_PCI_BAR 0x24
#define AHCI_MAX_SG 56 /* hardware max is 64K */
#define AHCI_CMD_SLOT_SZ 32
+#define AHCI_MAX_CMD_SLOT 32
#define AHCI_RX_FIS_SZ 256
#define AHCI_CMD_TBL_HDR 0x80
#define AHCI_CMD_TBL_CDB 0x40
#define AHCI_CMD_TBL_SZ AHCI_CMD_TBL_HDR + (AHCI_MAX_SG * 16)
-#define AHCI_PORT_PRIV_DMA_SZ AHCI_CMD_SLOT_SZ + AHCI_CMD_TBL_SZ \
- + AHCI_RX_FIS_SZ
+#define AHCI_PORT_PRIV_DMA_SZ (AHCI_CMD_SLOT_SZ * AHCI_MAX_CMD_SLOT + \
+ AHCI_CMD_TBL_SZ + AHCI_RX_FIS_SZ)
#define AHCI_CMD_ATAPI (1 << 5)
#define AHCI_CMD_WRITE (1 << 6)
#define AHCI_CMD_PREFETCH (1 << 7)