Quelle  spi-intel-pci.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Intel PCH/PCU SPI flash PCI driver.
 *
 * Copyright (C) 2016 - 2022, Intel Corporation
 * Author: Mika Westerberg <mika.westerberg@linux.intel.com>
 */

#include <linux/module.h>
#include <linux/pci.h>

#include "spi-intel.h"

#define BCR  0xdc
#define BCR_WPD  BIT(0)

static bool intel_spi_pci_set_writeable(void __iomem *base, void *data)
{
 struct pci_dev *pdev = data;
 u32 bcr;

 /* Try to make the chip read/write */
 pci_read_config_dword(pdev, BCR, &bcr);
 if (!(bcr & BCR_WPD)) {
  bcr |= BCR_WPD;
  pci_write_config_dword(pdev, BCR, bcr);
  pci_read_config_dword(pdev, BCR, &bcr);
 }

 return bcr & BCR_WPD;
}

static const struct intel_spi_boardinfo bxt_info = {
 .type = INTEL_SPI_BXT,
 .set_writeable = intel_spi_pci_set_writeable,
};

static const struct intel_spi_boardinfo cnl_info = {
 .type = INTEL_SPI_CNL,
 .set_writeable = intel_spi_pci_set_writeable,
};

static int intel_spi_pci_probe(struct pci_dev *pdev,
          const struct pci_device_id *id)
{
 struct intel_spi_boardinfo *info;
 void __iomem *base;
 int ret;

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

 info = devm_kmemdup(&pdev->dev, (void *)id->driver_data, sizeof(*info),
       GFP_KERNEL);
 if (!info)
  return -ENOMEM;

 info->data = pdev;

 base = pcim_iomap_region(pdev, 0, KBUILD_MODNAME);
 if (IS_ERR(base))
  return PTR_ERR(base);

 return intel_spi_probe(&pdev->dev, base, info);
}

static const struct pci_device_id intel_spi_pci_ids[] = {
 { PCI_VDEVICE(INTEL, 0x02a4), (unsigned long)&cnl_info },
 { PCI_VDEVICE(INTEL, 0x06a4), (unsigned long)&cnl_info },
 { PCI_VDEVICE(INTEL, 0x18e0), (unsigned long)&bxt_info },
 { PCI_VDEVICE(INTEL, 0x19e0), (unsigned long)&bxt_info },
 { PCI_VDEVICE(INTEL, 0x1bca), (unsigned long)&bxt_info },
 { PCI_VDEVICE(INTEL, 0x34a4), (unsigned long)&cnl_info },
 { PCI_VDEVICE(INTEL, 0x38a4), (unsigned long)&bxt_info },
 { PCI_VDEVICE(INTEL, 0x43a4), (unsigned long)&cnl_info },
 { PCI_VDEVICE(INTEL, 0x4b24), (unsigned long)&bxt_info },
 { PCI_VDEVICE(INTEL, 0x4da4), (unsigned long)&bxt_info },
 { PCI_VDEVICE(INTEL, 0x51a4), (unsigned long)&cnl_info },
 { PCI_VDEVICE(INTEL, 0x54a4), (unsigned long)&cnl_info },
 { PCI_VDEVICE(INTEL, 0x5794), (unsigned long)&cnl_info },
 { PCI_VDEVICE(INTEL, 0x7a24), (unsigned long)&cnl_info },
 { PCI_VDEVICE(INTEL, 0x7aa4), (unsigned long)&cnl_info },
 { PCI_VDEVICE(INTEL, 0x7e23), (unsigned long)&cnl_info },
 { PCI_VDEVICE(INTEL, 0x7f24), (unsigned long)&cnl_info },
 { PCI_VDEVICE(INTEL, 0x9d24), (unsigned long)&cnl_info },
 { PCI_VDEVICE(INTEL, 0x9da4), (unsigned long)&cnl_info },
 { PCI_VDEVICE(INTEL, 0xa0a4), (unsigned long)&cnl_info },
 { PCI_VDEVICE(INTEL, 0xa1a4), (unsigned long)&bxt_info },
 { PCI_VDEVICE(INTEL, 0xa224), (unsigned long)&bxt_info },
 { PCI_VDEVICE(INTEL, 0xa2a4), (unsigned long)&cnl_info },
 { PCI_VDEVICE(INTEL, 0xa324), (unsigned long)&cnl_info },
 { PCI_VDEVICE(INTEL, 0xa3a4), (unsigned long)&cnl_info },
 { PCI_VDEVICE(INTEL, 0xa823), (unsigned long)&cnl_info },
 { PCI_VDEVICE(INTEL, 0xe323), (unsigned long)&cnl_info },
 { PCI_VDEVICE(INTEL, 0xe423), (unsigned long)&cnl_info },
 { },
};
MODULE_DEVICE_TABLE(pci, intel_spi_pci_ids);

static struct pci_driver intel_spi_pci_driver = {
 .name = "intel-spi",
 .id_table = intel_spi_pci_ids,
 .probe = intel_spi_pci_probe,
 .dev_groups = intel_spi_groups,
};

module_pci_driver(intel_spi_pci_driver);

MODULE_DESCRIPTION("Intel PCH/PCU SPI flash PCI driver");
MODULE_AUTHOR("Mika Westerberg ");
MODULE_LICENSE("GPL v2");