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 bool intel_spi_pci_set_writeable(void __iomem *base, void *data)
  20 {
  21         struct pci_dev *pdev = data;
  22         u32 bcr;
  23
  24         /* Try to make the chip read/write */
  25         pci_read_config_dword(pdev, BCR, &bcr);
  26         if (!(bcr & BCR_WPD)) {
  27                 bcr |= BCR_WPD;
  28                 pci_write_config_dword(pdev, BCR, bcr);
  29                 pci_read_config_dword(pdev, BCR, &bcr);
  30         }
  31
  32         return bcr & BCR_WPD;
  33 }
  34
  35 static const struct intel_spi_boardinfo bxt_info = {
  36         .type = INTEL_SPI_BXT,
  37         .set_writeable = intel_spi_pci_set_writeable,
  38 };
  39
  40 static const struct intel_spi_boardinfo cnl_info = {
  41         .type = INTEL_SPI_CNL,
  42         .set_writeable = intel_spi_pci_set_writeable,
  43 };
  44
  45 static int intel_spi_pci_probe(struct pci_dev *pdev,
  46                                const struct pci_device_id *id)
  47 {
  48         struct intel_spi_boardinfo *info;
  49         struct intel_spi *ispi;
  50         int ret;
  51
  52         ret = pcim_enable_device(pdev);
  53         if (ret)
  54                 return ret;
  55
  56         info = devm_kmemdup(&pdev->dev, (void *)id->driver_data, sizeof(*info),
  57                             GFP_KERNEL);
  58         if (!info)
  59                 return -ENOMEM;
  60
  61         info->data = pdev;
  62         ispi = intel_spi_probe(&pdev->dev, &pdev->resource[0], info);
  63         if (IS_ERR(ispi))
  64                 return PTR_ERR(ispi);
  65
  66         pci_set_drvdata(pdev, ispi);
  67         return 0;
  68 }
  69
  70 static void intel_spi_pci_remove(struct pci_dev *pdev)
  71 {
  72         intel_spi_remove(pci_get_drvdata(pdev));
  73 }
  74
  75 static const struct pci_device_id intel_spi_pci_ids[] = {
  76         { PCI_VDEVICE(INTEL, 0x02a4), (unsigned long)&bxt_info },
  77         { PCI_VDEVICE(INTEL, 0x06a4), (unsigned long)&bxt_info },
  78         { PCI_VDEVICE(INTEL, 0x18e0), (unsigned long)&bxt_info },
  79         { PCI_VDEVICE(INTEL, 0x19e0), (unsigned long)&bxt_info },
  80         { PCI_VDEVICE(INTEL, 0x1bca), (unsigned long)&bxt_info },
  81         { PCI_VDEVICE(INTEL, 0x34a4), (unsigned long)&bxt_info },
  82         { PCI_VDEVICE(INTEL, 0x43a4), (unsigned long)&cnl_info },
  83         { PCI_VDEVICE(INTEL, 0x4b24), (unsigned long)&bxt_info },
  84         { PCI_VDEVICE(INTEL, 0x4da4), (unsigned long)&bxt_info },
  85         { PCI_VDEVICE(INTEL, 0x7aa4), (unsigned long)&cnl_info },
  86         { PCI_VDEVICE(INTEL, 0xa0a4), (unsigned long)&bxt_info },
  87         { PCI_VDEVICE(INTEL, 0xa1a4), (unsigned long)&bxt_info },
  88         { PCI_VDEVICE(INTEL, 0xa224), (unsigned long)&bxt_info },
  89         { PCI_VDEVICE(INTEL, 0xa324), (unsigned long)&cnl_info },
  90         { PCI_VDEVICE(INTEL, 0xa3a4), (unsigned long)&bxt_info },
  91         { },
  92 };
  93 MODULE_DEVICE_TABLE(pci, intel_spi_pci_ids);
  94
  95 static struct pci_driver intel_spi_pci_driver = {
  96         .name = "intel-spi",
  97         .id_table = intel_spi_pci_ids,
  98         .probe = intel_spi_pci_probe,
  99         .remove = intel_spi_pci_remove,
 100 };
 101
 102 module_pci_driver(intel_spi_pci_driver);
 103
 104 MODULE_DESCRIPTION("Intel PCH/PCU SPI flash PCI driver");
 105 MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");
 106 MODULE_LICENSE("GPL v2");