drivers/mtd/spi-nor/controllers/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 const struct intel_spi_boardinfo cnl_info = {
  24         .type = INTEL_SPI_CNL,
  25 };
  26
  27 static int intel_spi_pci_probe(struct pci_dev *pdev,
  28                                const struct pci_device_id *id)
  29 {
  30         struct intel_spi_boardinfo *info;
  31         struct intel_spi *ispi;
  32         u32 bcr;
  33         int ret;
  34
  35         ret = pcim_enable_device(pdev);
  36         if (ret)
  37                 return ret;
  38
  39         info = devm_kmemdup(&pdev->dev, (void *)id->driver_data, sizeof(*info),
  40                             GFP_KERNEL);
  41         if (!info)
  42                 return -ENOMEM;
  43
  44         /* Try to make the chip read/write */
  45         pci_read_config_dword(pdev, BCR, &bcr);
  46         if (!(bcr & BCR_WPD)) {
  47                 bcr |= BCR_WPD;
  48                 pci_write_config_dword(pdev, BCR, bcr);
  49                 pci_read_config_dword(pdev, BCR, &bcr);
  50         }
  51         info->writeable = !!(bcr & BCR_WPD);
  52
  53         ispi = intel_spi_probe(&pdev->dev, &pdev->resource[0], info);
  54         if (IS_ERR(ispi))
  55                 return PTR_ERR(ispi);
  56
  57         pci_set_drvdata(pdev, ispi);
  58         return 0;
  59 }
  60
  61 static void intel_spi_pci_remove(struct pci_dev *pdev)
  62 {
  63         intel_spi_remove(pci_get_drvdata(pdev));
  64 }
  65
  66 static const struct pci_device_id intel_spi_pci_ids[] = {
  67         { PCI_VDEVICE(INTEL, 0x02a4), (unsigned long)&bxt_info },
  68         { PCI_VDEVICE(INTEL, 0x06a4), (unsigned long)&bxt_info },
  69         { PCI_VDEVICE(INTEL, 0x18e0), (unsigned long)&bxt_info },
  70         { PCI_VDEVICE(INTEL, 0x19e0), (unsigned long)&bxt_info },
  71         { PCI_VDEVICE(INTEL, 0x34a4), (unsigned long)&bxt_info },
  72         { PCI_VDEVICE(INTEL, 0x4b24), (unsigned long)&bxt_info },
  73         { PCI_VDEVICE(INTEL, 0x4da4), (unsigned long)&bxt_info },
  74         { PCI_VDEVICE(INTEL, 0xa0a4), (unsigned long)&bxt_info },
  75         { PCI_VDEVICE(INTEL, 0xa1a4), (unsigned long)&bxt_info },
  76         { PCI_VDEVICE(INTEL, 0xa224), (unsigned long)&bxt_info },
  77         { PCI_VDEVICE(INTEL, 0xa324), (unsigned long)&cnl_info },
  78         { PCI_VDEVICE(INTEL, 0xa3a4), (unsigned long)&bxt_info },
  79         { },
  80 };
  81 MODULE_DEVICE_TABLE(pci, intel_spi_pci_ids);
  82
  83 static struct pci_driver intel_spi_pci_driver = {
  84         .name = "intel-spi",
  85         .id_table = intel_spi_pci_ids,
  86         .probe = intel_spi_pci_probe,
  87         .remove = intel_spi_pci_remove,
  88 };
  89
  90 module_pci_driver(intel_spi_pci_driver);
  91
  92 MODULE_DESCRIPTION("Intel PCH/PCU SPI flash PCI driver");
  93 MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");
  94 MODULE_LICENSE("GPL v2");