+ * mv_sff_check_status - fetch device status, if valid
+ * @ap: ATA port to fetch status from
+ *
+ * When using command issue via mv_qc_issue_fis(),
+ * the initial ATA_BUSY state does not show up in the
+ * ATA status (shadow) register. This can confuse libata!
+ *
+ * So we have a hook here to fake ATA_BUSY for that situation,
+ * until the first time a BUSY, DRQ, or ERR bit is seen.
+ *
+ * The rest of the time, it simply returns the ATA status register.
+ */
+static u8 mv_sff_check_status(struct ata_port *ap)
+{
+ u8 stat = ioread8(ap->ioaddr.status_addr);
+ struct mv_port_priv *pp = ap->private_data;
+
+ if (pp->pp_flags & MV_PP_FLAG_FAKE_ATA_BUSY) {
+ if (stat & (ATA_BUSY | ATA_DRQ | ATA_ERR))
+ pp->pp_flags &= ~MV_PP_FLAG_FAKE_ATA_BUSY;
+ else
+ stat = ATA_BUSY;
+ }
+ return stat;
+}
+
+/**
+ * mv_send_fis - Send a FIS, using the "Vendor-Unique FIS" register
+ * @fis: fis to be sent
+ * @nwords: number of 32-bit words in the fis
+ */
+static unsigned int mv_send_fis(struct ata_port *ap, u32 *fis, int nwords)
+{
+ void __iomem *port_mmio = mv_ap_base(ap);
+ u32 ifctl, old_ifctl, ifstat;
+ int i, timeout = 200, final_word = nwords - 1;
+
+ /* Initiate FIS transmission mode */
+ old_ifctl = readl(port_mmio + SATA_IFCTL);
+ ifctl = 0x100 | (old_ifctl & 0xf);
+ writelfl(ifctl, port_mmio + SATA_IFCTL);
+
+ /* Send all words of the FIS except for the final word */
+ for (i = 0; i < final_word; ++i)
+ writel(fis[i], port_mmio + VENDOR_UNIQUE_FIS);
+
+ /* Flag end-of-transmission, and then send the final word */
+ writelfl(ifctl | 0x200, port_mmio + SATA_IFCTL);
+ writelfl(fis[final_word], port_mmio + VENDOR_UNIQUE_FIS);
+
+ /*
+ * Wait for FIS transmission to complete.
+ * This typically takes just a single iteration.
+ */
+ do {
+ ifstat = readl(port_mmio + SATA_IFSTAT);
+ } while (!(ifstat & 0x1000) && --timeout);
+
+ /* Restore original port configuration */
+ writelfl(old_ifctl, port_mmio + SATA_IFCTL);
+
+ /* See if it worked */
+ if ((ifstat & 0x3000) != 0x1000) {
+ ata_port_printk(ap, KERN_WARNING,
+ "%s transmission error, ifstat=%08x\n",
+ __func__, ifstat);
+ return AC_ERR_OTHER;
+ }
+ return 0;
+}
+
+/**
+ * mv_qc_issue_fis - Issue a command directly as a FIS
+ * @qc: queued command to start
+ *
+ * Note that the ATA shadow registers are not updated
+ * after command issue, so the device will appear "READY"
+ * if polled, even while it is BUSY processing the command.
+ *
+ * So we use a status hook to fake ATA_BUSY until the drive changes state.
+ *
+ * Note: we don't get updated shadow regs on *completion*
+ * of non-data commands. So avoid sending them via this function,
+ * as they will appear to have completed immediately.
+ *
+ * GEN_IIE has special registers that we could get the result tf from,
+ * but earlier chipsets do not. For now, we ignore those registers.
+ */
+static unsigned int mv_qc_issue_fis(struct ata_queued_cmd *qc)
+{
+ struct ata_port *ap = qc->ap;
+ struct mv_port_priv *pp = ap->private_data;
+ struct ata_link *link = qc->dev->link;
+ u32 fis[5];
+ int err = 0;
+
+ ata_tf_to_fis(&qc->tf, link->pmp, 1, (void *)fis);
+ err = mv_send_fis(ap, fis, ARRAY_SIZE(fis));
+ if (err)
+ return err;
+
+ switch (qc->tf.protocol) {
+ case ATAPI_PROT_PIO:
+ pp->pp_flags |= MV_PP_FLAG_FAKE_ATA_BUSY;
+ /* fall through */
+ case ATAPI_PROT_NODATA:
+ ap->hsm_task_state = HSM_ST_FIRST;
+ break;
+ case ATA_PROT_PIO:
+ pp->pp_flags |= MV_PP_FLAG_FAKE_ATA_BUSY;
+ if (qc->tf.flags & ATA_TFLAG_WRITE)
+ ap->hsm_task_state = HSM_ST_FIRST;
+ else
+ ap->hsm_task_state = HSM_ST;
+ break;
+ default:
+ ap->hsm_task_state = HSM_ST_LAST;
+ break;
+ }
+
+ if (qc->tf.flags & ATA_TFLAG_POLLING)
+ ata_pio_queue_task(ap, qc, 0);
+ return 0;
+}
+
+/**