BID_SIL3132             = 1,
        BID_SIL3131             = 2,
 
+       /* host flags */
+       SIL24_COMMON_FLAGS      = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
+                                 ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA,
+
        IRQ_STAT_4PORTS         = 0xf,
 };
 
        /* sil_3124 */
        {
                .sht            = &sil24_sht,
-               .host_flags     = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
-                                 ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA |
-                                 SIL24_NPORTS2FLAG(4),
+               .host_flags     = SIL24_COMMON_FLAGS | SIL24_NPORTS2FLAG(4),
                .pio_mask       = 0x1f,                 /* pio0-4 */
                .mwdma_mask     = 0x07,                 /* mwdma0-2 */
                .udma_mask      = 0x3f,                 /* udma0-5 */
        /* sil_3132 */
        {
                .sht            = &sil24_sht,
-               .host_flags     = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
-                                 ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA |
-                                 SIL24_NPORTS2FLAG(2),
+               .host_flags     = SIL24_COMMON_FLAGS | SIL24_NPORTS2FLAG(2),
                .pio_mask       = 0x1f,                 /* pio0-4 */
                .mwdma_mask     = 0x07,                 /* mwdma0-2 */
                .udma_mask      = 0x3f,                 /* udma0-5 */
        /* sil_3131/sil_3531 */
        {
                .sht            = &sil24_sht,
-               .host_flags     = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
-                                 ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA |
-                                 SIL24_NPORTS2FLAG(1),
+               .host_flags     = SIL24_COMMON_FLAGS | SIL24_NPORTS2FLAG(1),
                .pio_mask       = 0x1f,                 /* pio0-4 */
                .mwdma_mask     = 0x07,                 /* mwdma0-2 */
                .udma_mask      = 0x3f,                 /* udma0-5 */