static int vfio_platform_amdxgbe_reset()

in platform/reset/vfio_platform_amdxgbe.c [48:110]

• 46 lines of code
• 11 McCabe index (conditional complexity)

static int vfio_platform_amdxgbe_reset(struct vfio_platform_device *vdev)
{
	struct vfio_platform_region *xgmac_regs = &vdev->regions[0];
	struct vfio_platform_region *xpcs_regs = &vdev->regions[1];
	u32 dma_mr_value, pcs_value, value;
	unsigned int count;

	if (!xgmac_regs->ioaddr) {
		xgmac_regs->ioaddr =
			ioremap(xgmac_regs->addr, xgmac_regs->size);
		if (!xgmac_regs->ioaddr)
			return -ENOMEM;
	}
	if (!xpcs_regs->ioaddr) {
		xpcs_regs->ioaddr =
			ioremap(xpcs_regs->addr, xpcs_regs->size);
		if (!xpcs_regs->ioaddr)
			return -ENOMEM;
	}

	/* reset the PHY through MDIO*/
	pcs_value = xmdio_read(xpcs_regs->ioaddr, MDIO_MMD_PCS, MDIO_CTRL1);
	pcs_value |= MDIO_CTRL1_RESET;
	xmdio_write(xpcs_regs->ioaddr, MDIO_MMD_PCS, MDIO_CTRL1, pcs_value);

	count = 50;
	do {
		msleep(20);
		pcs_value = xmdio_read(xpcs_regs->ioaddr, MDIO_MMD_PCS,
					MDIO_CTRL1);
	} while ((pcs_value & MDIO_CTRL1_RESET) && --count);

	if (pcs_value & MDIO_CTRL1_RESET)
		dev_warn(vdev->device, "%s: XGBE PHY reset timeout\n",
			 __func__);

	/* disable auto-negotiation */
	value = xmdio_read(xpcs_regs->ioaddr, MDIO_MMD_AN, MDIO_CTRL1);
	value &= ~MDIO_AN_CTRL1_ENABLE;
	xmdio_write(xpcs_regs->ioaddr, MDIO_MMD_AN, MDIO_CTRL1, value);

	/* disable AN IRQ */
	xmdio_write(xpcs_regs->ioaddr, MDIO_MMD_AN, MDIO_AN_INTMASK, 0);

	/* clear AN IRQ */
	xmdio_write(xpcs_regs->ioaddr, MDIO_MMD_AN, MDIO_AN_INT, 0);

	/* MAC software reset */
	dma_mr_value = ioread32(xgmac_regs->ioaddr + DMA_MR);
	dma_mr_value |= 0x1;
	iowrite32(dma_mr_value, xgmac_regs->ioaddr + DMA_MR);

	usleep_range(10, 15);

	count = 2000;
	while (--count && (ioread32(xgmac_regs->ioaddr + DMA_MR) & 1))
		usleep_range(500, 600);

	if (!count)
		dev_warn(vdev->device, "%s: MAC SW reset failed\n", __func__);

	return 0;
}