drivers/mtd/spi-nor/intel-spi-pci.c

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