static int ali_init_one()

in pata_ali.c [492:591]

• 82 lines of code
• 13 McCabe index (conditional complexity)

static int ali_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
{
	static const struct ata_port_info info_early = {
		.flags = ATA_FLAG_SLAVE_POSS,
		.pio_mask = ATA_PIO4,
		.port_ops = &ali_early_port_ops
	};
	/* Revision 0x20 added DMA */
	static const struct ata_port_info info_20 = {
		.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_PIO_LBA48 |
							ATA_FLAG_IGN_SIMPLEX,
		.pio_mask = ATA_PIO4,
		.mwdma_mask = ATA_MWDMA2,
		.port_ops = &ali_20_port_ops
	};
	/* Revision 0x20 with support logic added UDMA */
	static const struct ata_port_info info_20_udma = {
		.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_PIO_LBA48 |
							ATA_FLAG_IGN_SIMPLEX,
		.pio_mask = ATA_PIO4,
		.mwdma_mask = ATA_MWDMA2,
		.udma_mask = ATA_UDMA2,
		.port_ops = &ali_20_port_ops
	};
	/* Revision 0xC2 adds UDMA66 */
	static const struct ata_port_info info_c2 = {
		.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_PIO_LBA48 |
							ATA_FLAG_IGN_SIMPLEX,
		.pio_mask = ATA_PIO4,
		.mwdma_mask = ATA_MWDMA2,
		.udma_mask = ATA_UDMA4,
		.port_ops = &ali_c2_port_ops
	};
	/* Revision 0xC3 is UDMA66 for now */
	static const struct ata_port_info info_c3 = {
		.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_PIO_LBA48 |
							ATA_FLAG_IGN_SIMPLEX,
		.pio_mask = ATA_PIO4,
		.mwdma_mask = ATA_MWDMA2,
		.udma_mask = ATA_UDMA4,
		.port_ops = &ali_c2_port_ops
	};
	/* Revision 0xC4 is UDMA100 */
	static const struct ata_port_info info_c4 = {
		.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_PIO_LBA48 |
							ATA_FLAG_IGN_SIMPLEX,
		.pio_mask = ATA_PIO4,
		.mwdma_mask = ATA_MWDMA2,
		.udma_mask = ATA_UDMA5,
		.port_ops = &ali_c4_port_ops
	};
	/* Revision 0xC5 is UDMA133 with LBA48 DMA */
	static const struct ata_port_info info_c5 = {
		.flags = ATA_FLAG_SLAVE_POSS | 	ATA_FLAG_IGN_SIMPLEX,
		.pio_mask = ATA_PIO4,
		.mwdma_mask = ATA_MWDMA2,
		.udma_mask = ATA_UDMA6,
		.port_ops = &ali_c5_port_ops
	};

	const struct ata_port_info *ppi[] = { NULL, NULL };
	u8 tmp;
	int rc;

	rc = pcim_enable_device(pdev);
	if (rc)
		return rc;

	/*
	 * The chipset revision selects the driver operations and
	 * mode data.
	 */

	if (pdev->revision < 0x20) {
		ppi[0] = &info_early;
	} else if (pdev->revision < 0xC2) {
        	ppi[0] = &info_20;
	} else if (pdev->revision == 0xC2) {
        	ppi[0] = &info_c2;
	} else if (pdev->revision == 0xC3) {
        	ppi[0] = &info_c3;
	} else if (pdev->revision == 0xC4) {
        	ppi[0] = &info_c4;
	} else
        	ppi[0] = &info_c5;

	ali_init_chipset(pdev);

	if (ali_isa_bridge && pdev->revision >= 0x20 && pdev->revision < 0xC2) {
		/* Are we paired with a UDMA capable chip */
		pci_read_config_byte(ali_isa_bridge, 0x5E, &tmp);
		if ((tmp & 0x1E) == 0x12)
	        	ppi[0] = &info_20_udma;
	}

	if (!ppi[0]->mwdma_mask && !ppi[0]->udma_mask)
		return ata_pci_sff_init_one(pdev, ppi, &ali_sht, NULL, 0);
	else
		return ata_pci_bmdma_init_one(pdev, ppi, &ali_sht, NULL, 0);
}