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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spi-intel-pci.c (2903B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Intel PCH/PCU SPI flash PCI driver.
      4 *
      5 * Copyright (C) 2016 - 2022, Intel Corporation
      6 * Author: Mika Westerberg <mika.westerberg@linux.intel.com>
      7 */
      8
      9#include <linux/module.h>
     10#include <linux/pci.h>
     11
     12#include "spi-intel.h"
     13
     14#define BCR		0xdc
     15#define BCR_WPD		BIT(0)
     16
     17static bool intel_spi_pci_set_writeable(void __iomem *base, void *data)
     18{
     19	struct pci_dev *pdev = data;
     20	u32 bcr;
     21
     22	/* Try to make the chip read/write */
     23	pci_read_config_dword(pdev, BCR, &bcr);
     24	if (!(bcr & BCR_WPD)) {
     25		bcr |= BCR_WPD;
     26		pci_write_config_dword(pdev, BCR, bcr);
     27		pci_read_config_dword(pdev, BCR, &bcr);
     28	}
     29
     30	return bcr & BCR_WPD;
     31}
     32
     33static const struct intel_spi_boardinfo bxt_info = {
     34	.type = INTEL_SPI_BXT,
     35	.set_writeable = intel_spi_pci_set_writeable,
     36};
     37
     38static const struct intel_spi_boardinfo cnl_info = {
     39	.type = INTEL_SPI_CNL,
     40	.set_writeable = intel_spi_pci_set_writeable,
     41};
     42
     43static int intel_spi_pci_probe(struct pci_dev *pdev,
     44			       const struct pci_device_id *id)
     45{
     46	struct intel_spi_boardinfo *info;
     47	int ret;
     48
     49	ret = pcim_enable_device(pdev);
     50	if (ret)
     51		return ret;
     52
     53	info = devm_kmemdup(&pdev->dev, (void *)id->driver_data, sizeof(*info),
     54			    GFP_KERNEL);
     55	if (!info)
     56		return -ENOMEM;
     57
     58	info->data = pdev;
     59	return intel_spi_probe(&pdev->dev, &pdev->resource[0], info);
     60}
     61
     62static const struct pci_device_id intel_spi_pci_ids[] = {
     63	{ PCI_VDEVICE(INTEL, 0x02a4), (unsigned long)&bxt_info },
     64	{ PCI_VDEVICE(INTEL, 0x06a4), (unsigned long)&bxt_info },
     65	{ PCI_VDEVICE(INTEL, 0x18e0), (unsigned long)&bxt_info },
     66	{ PCI_VDEVICE(INTEL, 0x19e0), (unsigned long)&bxt_info },
     67	{ PCI_VDEVICE(INTEL, 0x1bca), (unsigned long)&bxt_info },
     68	{ PCI_VDEVICE(INTEL, 0x34a4), (unsigned long)&bxt_info },
     69	{ PCI_VDEVICE(INTEL, 0x38a4), (unsigned long)&bxt_info },
     70	{ PCI_VDEVICE(INTEL, 0x43a4), (unsigned long)&cnl_info },
     71	{ PCI_VDEVICE(INTEL, 0x4b24), (unsigned long)&bxt_info },
     72	{ PCI_VDEVICE(INTEL, 0x4da4), (unsigned long)&bxt_info },
     73	{ PCI_VDEVICE(INTEL, 0x51a4), (unsigned long)&cnl_info },
     74	{ PCI_VDEVICE(INTEL, 0x54a4), (unsigned long)&cnl_info },
     75	{ PCI_VDEVICE(INTEL, 0x7a24), (unsigned long)&cnl_info },
     76	{ PCI_VDEVICE(INTEL, 0x7aa4), (unsigned long)&cnl_info },
     77	{ PCI_VDEVICE(INTEL, 0xa0a4), (unsigned long)&bxt_info },
     78	{ PCI_VDEVICE(INTEL, 0xa1a4), (unsigned long)&bxt_info },
     79	{ PCI_VDEVICE(INTEL, 0xa224), (unsigned long)&bxt_info },
     80	{ PCI_VDEVICE(INTEL, 0xa324), (unsigned long)&cnl_info },
     81	{ PCI_VDEVICE(INTEL, 0xa3a4), (unsigned long)&bxt_info },
     82	{ },
     83};
     84MODULE_DEVICE_TABLE(pci, intel_spi_pci_ids);
     85
     86static struct pci_driver intel_spi_pci_driver = {
     87	.name = "intel-spi",
     88	.id_table = intel_spi_pci_ids,
     89	.probe = intel_spi_pci_probe,
     90};
     91
     92module_pci_driver(intel_spi_pci_driver);
     93
     94MODULE_DESCRIPTION("Intel PCH/PCU SPI flash PCI driver");
     95MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");
     96MODULE_LICENSE("GPL v2");