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

   1 /*
   2  * Intel PCH/PCU SPI flash PCI driver.
   3  *
   4  * Copyright (C) 2016, Intel Corporation
   5  * Author: Mika Westerberg <mika.westerberg@linux.intel.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/ioport.h>
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/pci.h>
  16
  17 #include "intel-spi.h"
  18
  19 #define BCR             0xdc
  20 #define BCR_WPD         BIT(0)
  21
  22 static const struct intel_spi_boardinfo bxt_info = {
  23         .type = INTEL_SPI_BXT,
  24 };
  25
  26 static int intel_spi_pci_probe(struct pci_dev *pdev,
  27                                const struct pci_device_id *id)
  28 {
  29         struct intel_spi_boardinfo *info;
  30         struct intel_spi *ispi;
  31         u32 bcr;
  32         int ret;
  33
  34         ret = pcim_enable_device(pdev);
  35         if (ret)
  36                 return ret;
  37
  38         info = devm_kmemdup(&pdev->dev, (void *)id->driver_data, sizeof(*info),
  39                             GFP_KERNEL);
  40         if (!info)
  41                 return -ENOMEM;
  42
  43         /* Try to make the chip read/write */
  44         pci_read_config_dword(pdev, BCR, &bcr);
  45         if (!(bcr & BCR_WPD)) {
  46                 bcr |= BCR_WPD;
  47                 pci_write_config_dword(pdev, BCR, bcr);
  48                 pci_read_config_dword(pdev, BCR, &bcr);
  49         }
  50         info->writeable = !!(bcr & BCR_WPD);
  51
  52         ispi = intel_spi_probe(&pdev->dev, &pdev->resource[0], info);
  53         if (IS_ERR(ispi))
  54                 return PTR_ERR(ispi);
  55
  56         pci_set_drvdata(pdev, ispi);
  57         return 0;
  58 }
  59
  60 static void intel_spi_pci_remove(struct pci_dev *pdev)
  61 {
  62         intel_spi_remove(pci_get_drvdata(pdev));
  63 }
  64
  65 static const struct pci_device_id intel_spi_pci_ids[] = {
  66         { PCI_VDEVICE(INTEL, 0x18e0), (unsigned long)&bxt_info },
  67         { PCI_VDEVICE(INTEL, 0x19e0), (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");