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While vfio-platform itself is on a reprieve from being removed[1], these reset drivers don't support any current hardware, are not being tested, and suggest a level of support that doesn't really exist. Mark them for removal to surface any remaining user such that we can potentially drop them and simplify the code if none appear. Link: https://lore.kernel.org/all/20250806170314.3768750-3-alex.williamson@redhat.com [1] Reviewed-by: Pranjal Shrivastava <praan@google.com> Reviewed-by: Mostafa Saleh <smostafa@google.com> Reviewed-by: Eric Auger <eric.auger@redhat.com> Link: https://lore.kernel.org/r/20250825175807.3264083-3-alex.williamson@redhat.com Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
120 lines
3.3 KiB
C
120 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* VFIO platform driver specialized for AMD xgbe reset
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* reset code is inherited from AMD xgbe native driver
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*
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* Copyright (c) 2015 Linaro Ltd.
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* www.linaro.org
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <uapi/linux/mdio.h>
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#include <linux/delay.h>
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#include "../vfio_platform_private.h"
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#define DMA_MR 0x3000
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#define MAC_VR 0x0110
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#define DMA_ISR 0x3008
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#define MAC_ISR 0x00b0
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#define PCS_MMD_SELECT 0xff
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#define MDIO_AN_INT 0x8002
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#define MDIO_AN_INTMASK 0x8001
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static unsigned int xmdio_read(void __iomem *ioaddr, unsigned int mmd,
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unsigned int reg)
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{
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unsigned int mmd_address, value;
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mmd_address = (mmd << 16) | ((reg) & 0xffff);
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iowrite32(mmd_address >> 8, ioaddr + (PCS_MMD_SELECT << 2));
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value = ioread32(ioaddr + ((mmd_address & 0xff) << 2));
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return value;
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}
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static void xmdio_write(void __iomem *ioaddr, unsigned int mmd,
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unsigned int reg, unsigned int value)
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{
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unsigned int mmd_address;
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mmd_address = (mmd << 16) | ((reg) & 0xffff);
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iowrite32(mmd_address >> 8, ioaddr + (PCS_MMD_SELECT << 2));
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iowrite32(value, ioaddr + ((mmd_address & 0xff) << 2));
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}
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static int vfio_platform_amdxgbe_reset(struct vfio_platform_device *vdev)
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{
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struct vfio_platform_region *xgmac_regs = &vdev->regions[0];
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struct vfio_platform_region *xpcs_regs = &vdev->regions[1];
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u32 dma_mr_value, pcs_value, value;
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unsigned int count;
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dev_err_once(vdev->device, "DEPRECATION: VFIO AMD XGBE platform reset is deprecated and will be removed in a future kernel release\n");
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if (!xgmac_regs->ioaddr) {
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xgmac_regs->ioaddr =
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ioremap(xgmac_regs->addr, xgmac_regs->size);
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if (!xgmac_regs->ioaddr)
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return -ENOMEM;
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}
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if (!xpcs_regs->ioaddr) {
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xpcs_regs->ioaddr =
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ioremap(xpcs_regs->addr, xpcs_regs->size);
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if (!xpcs_regs->ioaddr)
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return -ENOMEM;
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}
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/* reset the PHY through MDIO*/
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pcs_value = xmdio_read(xpcs_regs->ioaddr, MDIO_MMD_PCS, MDIO_CTRL1);
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pcs_value |= MDIO_CTRL1_RESET;
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xmdio_write(xpcs_regs->ioaddr, MDIO_MMD_PCS, MDIO_CTRL1, pcs_value);
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count = 50;
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do {
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msleep(20);
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pcs_value = xmdio_read(xpcs_regs->ioaddr, MDIO_MMD_PCS,
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MDIO_CTRL1);
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} while ((pcs_value & MDIO_CTRL1_RESET) && --count);
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if (pcs_value & MDIO_CTRL1_RESET)
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dev_warn(vdev->device, "%s: XGBE PHY reset timeout\n",
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__func__);
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/* disable auto-negotiation */
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value = xmdio_read(xpcs_regs->ioaddr, MDIO_MMD_AN, MDIO_CTRL1);
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value &= ~MDIO_AN_CTRL1_ENABLE;
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xmdio_write(xpcs_regs->ioaddr, MDIO_MMD_AN, MDIO_CTRL1, value);
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/* disable AN IRQ */
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xmdio_write(xpcs_regs->ioaddr, MDIO_MMD_AN, MDIO_AN_INTMASK, 0);
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/* clear AN IRQ */
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xmdio_write(xpcs_regs->ioaddr, MDIO_MMD_AN, MDIO_AN_INT, 0);
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/* MAC software reset */
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dma_mr_value = ioread32(xgmac_regs->ioaddr + DMA_MR);
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dma_mr_value |= 0x1;
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iowrite32(dma_mr_value, xgmac_regs->ioaddr + DMA_MR);
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usleep_range(10, 15);
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count = 2000;
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while (--count && (ioread32(xgmac_regs->ioaddr + DMA_MR) & 1))
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usleep_range(500, 600);
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if (!count)
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dev_warn(vdev->device, "%s: MAC SW reset failed\n", __func__);
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return 0;
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}
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module_vfio_reset_handler("amd,xgbe-seattle-v1a", vfio_platform_amdxgbe_reset);
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MODULE_VERSION("0.1");
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Eric Auger <eric.auger@linaro.org>");
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MODULE_DESCRIPTION("Reset support for AMD xgbe vfio platform device");
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