static int mv_chip_id()

in sata_mv.c [3763:3905]

• 115 lines of code
• 23 McCabe index (conditional complexity)

static int mv_chip_id(struct ata_host *host, unsigned int board_idx)
{
	struct pci_dev *pdev = to_pci_dev(host->dev);
	struct mv_host_priv *hpriv = host->private_data;
	u32 hp_flags = hpriv->hp_flags;

	switch (board_idx) {
	case chip_5080:
		hpriv->ops = &mv5xxx_ops;
		hp_flags |= MV_HP_GEN_I;

		switch (pdev->revision) {
		case 0x1:
			hp_flags |= MV_HP_ERRATA_50XXB0;
			break;
		case 0x3:
			hp_flags |= MV_HP_ERRATA_50XXB2;
			break;
		default:
			dev_warn(&pdev->dev,
				 "Applying 50XXB2 workarounds to unknown rev\n");
			hp_flags |= MV_HP_ERRATA_50XXB2;
			break;
		}
		break;

	case chip_504x:
	case chip_508x:
		hpriv->ops = &mv5xxx_ops;
		hp_flags |= MV_HP_GEN_I;

		switch (pdev->revision) {
		case 0x0:
			hp_flags |= MV_HP_ERRATA_50XXB0;
			break;
		case 0x3:
			hp_flags |= MV_HP_ERRATA_50XXB2;
			break;
		default:
			dev_warn(&pdev->dev,
				 "Applying B2 workarounds to unknown rev\n");
			hp_flags |= MV_HP_ERRATA_50XXB2;
			break;
		}
		break;

	case chip_604x:
	case chip_608x:
		hpriv->ops = &mv6xxx_ops;
		hp_flags |= MV_HP_GEN_II;

		switch (pdev->revision) {
		case 0x7:
			mv_60x1b2_errata_pci7(host);
			hp_flags |= MV_HP_ERRATA_60X1B2;
			break;
		case 0x9:
			hp_flags |= MV_HP_ERRATA_60X1C0;
			break;
		default:
			dev_warn(&pdev->dev,
				 "Applying B2 workarounds to unknown rev\n");
			hp_flags |= MV_HP_ERRATA_60X1B2;
			break;
		}
		break;

	case chip_7042:
		hp_flags |= MV_HP_PCIE | MV_HP_CUT_THROUGH;
		if (pdev->vendor == PCI_VENDOR_ID_TTI &&
		    (pdev->device == 0x2300 || pdev->device == 0x2310))
		{
			/*
			 * Highpoint RocketRAID PCIe 23xx series cards:
			 *
			 * Unconfigured drives are treated as "Legacy"
			 * by the BIOS, and it overwrites sector 8 with
			 * a "Lgcy" metadata block prior to Linux boot.
			 *
			 * Configured drives (RAID or JBOD) leave sector 8
			 * alone, but instead overwrite a high numbered
			 * sector for the RAID metadata.  This sector can
			 * be determined exactly, by truncating the physical
			 * drive capacity to a nice even GB value.
			 *
			 * RAID metadata is at: (dev->n_sectors & ~0xfffff)
			 *
			 * Warn the user, lest they think we're just buggy.
			 */
			dev_warn(&pdev->dev, "Highpoint RocketRAID"
				" BIOS CORRUPTS DATA on all attached drives,"
				" regardless of if/how they are configured."
				" BEWARE!\n");
			dev_warn(&pdev->dev, "For data safety, do not"
				" use sectors 8-9 on \"Legacy\" drives,"
				" and avoid the final two gigabytes on"
				" all RocketRAID BIOS initialized drives.\n");
		}
		fallthrough;
	case chip_6042:
		hpriv->ops = &mv6xxx_ops;
		hp_flags |= MV_HP_GEN_IIE;
		if (board_idx == chip_6042 && mv_pci_cut_through_okay(host))
			hp_flags |= MV_HP_CUT_THROUGH;

		switch (pdev->revision) {
		case 0x2: /* Rev.B0: the first/only public release */
			hp_flags |= MV_HP_ERRATA_60X1C0;
			break;
		default:
			dev_warn(&pdev->dev,
				 "Applying 60X1C0 workarounds to unknown rev\n");
			hp_flags |= MV_HP_ERRATA_60X1C0;
			break;
		}
		break;
	case chip_soc:
		if (soc_is_65n(hpriv))
			hpriv->ops = &mv_soc_65n_ops;
		else
			hpriv->ops = &mv_soc_ops;
		hp_flags |= MV_HP_FLAG_SOC | MV_HP_GEN_IIE |
			MV_HP_ERRATA_60X1C0;
		break;

	default:
		dev_alert(host->dev, "BUG: invalid board index %u\n", board_idx);
		return -EINVAL;
	}

	hpriv->hp_flags = hp_flags;
	if (hp_flags & MV_HP_PCIE) {
		hpriv->irq_cause_offset	= PCIE_IRQ_CAUSE;
		hpriv->irq_mask_offset	= PCIE_IRQ_MASK;
		hpriv->unmask_all_irqs	= PCIE_UNMASK_ALL_IRQS;
	} else {
		hpriv->irq_cause_offset	= PCI_IRQ_CAUSE;
		hpriv->irq_mask_offset	= PCI_IRQ_MASK;
		hpriv->unmask_all_irqs	= PCI_UNMASK_ALL_IRQS;
	}

	return 0;
}