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
intel_spi_pci_set_writeable(void __iomem * base,void * data)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
intel_spi_pci_probe(struct pci_dev * pdev,const struct pci_device_id * id)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, 0x7e23), (unsigned long)&cnl_info },
78 { PCI_VDEVICE(INTEL, 0xa0a4), (unsigned long)&bxt_info },
79 { PCI_VDEVICE(INTEL, 0xa1a4), (unsigned long)&bxt_info },
80 { PCI_VDEVICE(INTEL, 0xa224), (unsigned long)&bxt_info },
81 { PCI_VDEVICE(INTEL, 0xa324), (unsigned long)&cnl_info },
82 { PCI_VDEVICE(INTEL, 0xa3a4), (unsigned long)&bxt_info },
83 { },
84 };
85 MODULE_DEVICE_TABLE(pci, intel_spi_pci_ids);
86
87 static struct pci_driver intel_spi_pci_driver = {
88 .name = "intel-spi",
89 .id_table = intel_spi_pci_ids,
90 .probe = intel_spi_pci_probe,
91 };
92
93 module_pci_driver(intel_spi_pci_driver);
94
95 MODULE_DESCRIPTION("Intel PCH/PCU SPI flash PCI driver");
96 MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");
97 MODULE_LICENSE("GPL v2");
98
