drivers/spi/spi-intel-pci.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Intel PCH/PCU SPI flash PCI driver.
   4  *
   5  * Copyright (C) 2016 - 2022, Intel Corporation
   6  * Author: Mika Westerberg <mika.westerberg@linux.intel.com>
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/pci.h>
  11
  12 #include "spi-intel.h"
  13
  14 #define BCR             0xdc
  15 #define BCR_WPD         BIT(0)
  16
  17 static bool intel_spi_pci_set_writeable(void __iomem *base, void *data)
  18 {
  19         struct pci_dev *pdev = data;
  20         u32 bcr;
  21
  22         /* Try to make the chip read/write */
  23         pci_read_config_dword(pdev, BCR, &bcr);
  24         if (!(bcr & BCR_WPD)) {
  25                 bcr |= BCR_WPD;
  26                 pci_write_config_dword(pdev, BCR, bcr);
  27                 pci_read_config_dword(pdev, BCR, &bcr);
  28         }
  29
  30         return bcr & BCR_WPD;
  31 }
  32
  33 static const struct intel_spi_boardinfo bxt_info = {
  34         .type = INTEL_SPI_BXT,
  35         .set_writeable = intel_spi_pci_set_writeable,
  36 };
  37
  38 static const struct intel_spi_boardinfo cnl_info = {
  39         .type = INTEL_SPI_CNL,
  40         .set_writeable = intel_spi_pci_set_writeable,
  41 };
  42
  43 static int intel_spi_pci_probe(struct pci_dev *pdev,
  44                                const struct pci_device_id *id)
  45 {
  46         struct intel_spi_boardinfo *info;
  47         int ret;
  48
  49         ret = pcim_enable_device(pdev);
  50         if (ret)
  51                 return ret;
  52
  53         info = devm_kmemdup(&pdev->dev, (void *)id->driver_data, sizeof(*info),
  54                             GFP_KERNEL);
  55         if (!info)
  56                 return -ENOMEM;
  57
  58         info->data = pdev;
  59         return intel_spi_probe(&pdev->dev, &pdev->resource[0], info);
  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, 0x06a4), (unsigned long)&bxt_info },
  65         { PCI_VDEVICE(INTEL, 0x18e0), (unsigned long)&bxt_info },
  66         { PCI_VDEVICE(INTEL, 0x19e0), (unsigned long)&bxt_info },
  67         { PCI_VDEVICE(INTEL, 0x1bca), (unsigned long)&bxt_info },
  68         { PCI_VDEVICE(INTEL, 0x34a4), (unsigned long)&bxt_info },
  69         { PCI_VDEVICE(INTEL, 0x38a4), (unsigned long)&bxt_info },
  70         { PCI_VDEVICE(INTEL, 0x43a4), (unsigned long)&cnl_info },
  71         { PCI_VDEVICE(INTEL, 0x4b24), (unsigned long)&bxt_info },
  72         { PCI_VDEVICE(INTEL, 0x4da4), (unsigned long)&bxt_info },
  73         { PCI_VDEVICE(INTEL, 0x51a4), (unsigned long)&cnl_info },
  74         { PCI_VDEVICE(INTEL, 0x54a4), (unsigned long)&cnl_info },
  75         { PCI_VDEVICE(INTEL, 0x7a24), (unsigned long)&cnl_info },
  76         { PCI_VDEVICE(INTEL, 0x7aa4), (unsigned long)&cnl_info },
  77         { PCI_VDEVICE(INTEL, 0xa0a4), (unsigned long)&bxt_info },
  78         { PCI_VDEVICE(INTEL, 0xa1a4), (unsigned long)&bxt_info },
  79         { PCI_VDEVICE(INTEL, 0xa224), (unsigned long)&bxt_info },
  80         { PCI_VDEVICE(INTEL, 0xa324), (unsigned long)&cnl_info },
  81         { PCI_VDEVICE(INTEL, 0xa3a4), (unsigned long)&bxt_info },
  82         { },
  83 };
  84 MODULE_DEVICE_TABLE(pci, intel_spi_pci_ids);
  85
  86 static struct pci_driver intel_spi_pci_driver = {
  87         .name = "intel-spi",
  88         .id_table = intel_spi_pci_ids,
  89         .probe = intel_spi_pci_probe,
  90 };
  91
  92 module_pci_driver(intel_spi_pci_driver);
  93
  94 MODULE_DESCRIPTION("Intel PCH/PCU SPI flash PCI driver");
  95 MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");
  96 MODULE_LICENSE("GPL v2");