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
intel_spi_pci_probe(struct pci_dev * pdev,const struct pci_device_id * id)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
intel_spi_pci_remove(struct pci_dev * pdev)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, 0x19e0), (unsigned long)&bxt_info },
67 { },
68 };
69 MODULE_DEVICE_TABLE(pci, intel_spi_pci_ids);
70
71 static struct pci_driver intel_spi_pci_driver = {
72 .name = "intel-spi",
73 .id_table = intel_spi_pci_ids,
74 .probe = intel_spi_pci_probe,
75 .remove = intel_spi_pci_remove,
76 };
77
78 module_pci_driver(intel_spi_pci_driver);
79
80 MODULE_DESCRIPTION("Intel PCH/PCU SPI flash PCI driver");
81 MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");
82 MODULE_LICENSE("GPL v2");
83