+static void pdc20621_nodata_prep(struct ata_queued_cmd *qc)
+{
+ struct ata_port *ap = qc->ap;
+ struct pdc_port_priv *pp = ap->private_data;
+ void *mmio = ap->host_set->mmio_base;
+ struct pdc_host_priv *hpriv = ap->host_set->private_data;
+ void *dimm_mmio = hpriv->dimm_mmio;
+ unsigned int portno = ap->port_no;
+ unsigned int i;
+
+ VPRINTK("ata%u: ENTER\n", ap->id);
+
+ /* hard-code chip #0 */
+ mmio += PDC_CHIP0_OFS;
+
+ i = pdc20621_ata_pkt(&qc->tf, qc->dev->devno, &pp->dimm_buf[0], portno);
+
+ if (qc->tf.flags & ATA_TFLAG_LBA48)
+ i = pdc_prep_lba48(&qc->tf, &pp->dimm_buf[0], i);
+ else
+ i = pdc_prep_lba28(&qc->tf, &pp->dimm_buf[0], i);
+
+ pdc_pkt_footer(&qc->tf, &pp->dimm_buf[0], i);
+
+ /* copy three S/G tables and two packets to DIMM MMIO window */
+ memcpy_toio(dimm_mmio + (portno * PDC_DIMM_WINDOW_STEP),
+ &pp->dimm_buf, PDC_DIMM_HEADER_SZ);
+
+ /* force host FIFO dump */
+ writel(0x00000001, mmio + PDC_20621_GENERAL_CTL);
+
+ readl(dimm_mmio); /* MMIO PCI posting flush */
+
+ VPRINTK("ata pkt buf ofs %u, mmio copied\n", i);
+}
+
+static void pdc20621_qc_prep(struct ata_queued_cmd *qc)
+{
+ switch (qc->tf.protocol) {
+ case ATA_PROT_DMA:
+ pdc20621_dma_prep(qc);
+ break;
+ case ATA_PROT_NODATA:
+ pdc20621_nodata_prep(qc);
+ break;
+ default:
+ break;
+ }
+}
+