cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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vfio_platform_amdxgbe.c (3263B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * VFIO platform driver specialized for AMD xgbe reset
      4 * reset code is inherited from AMD xgbe native driver
      5 *
      6 * Copyright (c) 2015 Linaro Ltd.
      7 *              www.linaro.org
      8 */
      9
     10#include <linux/module.h>
     11#include <linux/kernel.h>
     12#include <linux/init.h>
     13#include <linux/io.h>
     14#include <uapi/linux/mdio.h>
     15#include <linux/delay.h>
     16
     17#include "../vfio_platform_private.h"
     18
     19#define DMA_MR			0x3000
     20#define MAC_VR			0x0110
     21#define DMA_ISR			0x3008
     22#define MAC_ISR			0x00b0
     23#define PCS_MMD_SELECT		0xff
     24#define MDIO_AN_INT		0x8002
     25#define MDIO_AN_INTMASK		0x8001
     26
     27static unsigned int xmdio_read(void __iomem *ioaddr, unsigned int mmd,
     28			       unsigned int reg)
     29{
     30	unsigned int mmd_address, value;
     31
     32	mmd_address = (mmd << 16) | ((reg) & 0xffff);
     33	iowrite32(mmd_address >> 8, ioaddr + (PCS_MMD_SELECT << 2));
     34	value = ioread32(ioaddr + ((mmd_address & 0xff) << 2));
     35	return value;
     36}
     37
     38static void xmdio_write(void __iomem *ioaddr, unsigned int mmd,
     39			unsigned int reg, unsigned int value)
     40{
     41	unsigned int mmd_address;
     42
     43	mmd_address = (mmd << 16) | ((reg) & 0xffff);
     44	iowrite32(mmd_address >> 8, ioaddr + (PCS_MMD_SELECT << 2));
     45	iowrite32(value, ioaddr + ((mmd_address & 0xff) << 2));
     46}
     47
     48static int vfio_platform_amdxgbe_reset(struct vfio_platform_device *vdev)
     49{
     50	struct vfio_platform_region *xgmac_regs = &vdev->regions[0];
     51	struct vfio_platform_region *xpcs_regs = &vdev->regions[1];
     52	u32 dma_mr_value, pcs_value, value;
     53	unsigned int count;
     54
     55	if (!xgmac_regs->ioaddr) {
     56		xgmac_regs->ioaddr =
     57			ioremap(xgmac_regs->addr, xgmac_regs->size);
     58		if (!xgmac_regs->ioaddr)
     59			return -ENOMEM;
     60	}
     61	if (!xpcs_regs->ioaddr) {
     62		xpcs_regs->ioaddr =
     63			ioremap(xpcs_regs->addr, xpcs_regs->size);
     64		if (!xpcs_regs->ioaddr)
     65			return -ENOMEM;
     66	}
     67
     68	/* reset the PHY through MDIO*/
     69	pcs_value = xmdio_read(xpcs_regs->ioaddr, MDIO_MMD_PCS, MDIO_CTRL1);
     70	pcs_value |= MDIO_CTRL1_RESET;
     71	xmdio_write(xpcs_regs->ioaddr, MDIO_MMD_PCS, MDIO_CTRL1, pcs_value);
     72
     73	count = 50;
     74	do {
     75		msleep(20);
     76		pcs_value = xmdio_read(xpcs_regs->ioaddr, MDIO_MMD_PCS,
     77					MDIO_CTRL1);
     78	} while ((pcs_value & MDIO_CTRL1_RESET) && --count);
     79
     80	if (pcs_value & MDIO_CTRL1_RESET)
     81		dev_warn(vdev->device, "%s: XGBE PHY reset timeout\n",
     82			 __func__);
     83
     84	/* disable auto-negotiation */
     85	value = xmdio_read(xpcs_regs->ioaddr, MDIO_MMD_AN, MDIO_CTRL1);
     86	value &= ~MDIO_AN_CTRL1_ENABLE;
     87	xmdio_write(xpcs_regs->ioaddr, MDIO_MMD_AN, MDIO_CTRL1, value);
     88
     89	/* disable AN IRQ */
     90	xmdio_write(xpcs_regs->ioaddr, MDIO_MMD_AN, MDIO_AN_INTMASK, 0);
     91
     92	/* clear AN IRQ */
     93	xmdio_write(xpcs_regs->ioaddr, MDIO_MMD_AN, MDIO_AN_INT, 0);
     94
     95	/* MAC software reset */
     96	dma_mr_value = ioread32(xgmac_regs->ioaddr + DMA_MR);
     97	dma_mr_value |= 0x1;
     98	iowrite32(dma_mr_value, xgmac_regs->ioaddr + DMA_MR);
     99
    100	usleep_range(10, 15);
    101
    102	count = 2000;
    103	while (--count && (ioread32(xgmac_regs->ioaddr + DMA_MR) & 1))
    104		usleep_range(500, 600);
    105
    106	if (!count)
    107		dev_warn(vdev->device, "%s: MAC SW reset failed\n", __func__);
    108
    109	return 0;
    110}
    111
    112module_vfio_reset_handler("amd,xgbe-seattle-v1a", vfio_platform_amdxgbe_reset);
    113
    114MODULE_VERSION("0.1");
    115MODULE_LICENSE("GPL v2");
    116MODULE_AUTHOR("Eric Auger <eric.auger@linaro.org>");
    117MODULE_DESCRIPTION("Reset support for AMD xgbe vfio platform device");