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
17static 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(dev: pdev, BCR, val: &bcr);
24 if (!(bcr & BCR_WPD)) {
25 bcr |= BCR_WPD;
26 pci_write_config_dword(dev: pdev, BCR, val: bcr);
27 pci_read_config_dword(dev: pdev, BCR, val: &bcr);
28 }
29
30 return bcr & BCR_WPD;
31}
32
33static const struct intel_spi_boardinfo bxt_info = {
34 .type = INTEL_SPI_BXT,
35 .set_writeable = intel_spi_pci_set_writeable,
36};
37
38static const struct intel_spi_boardinfo cnl_info = {
39 .type = INTEL_SPI_CNL,
40 .set_writeable = intel_spi_pci_set_writeable,
41};
42
43static int intel_spi_pci_probe(struct pci_dev *pdev,
44 const struct pci_device_id *id)
45{
46 struct intel_spi_boardinfo *info;
47 void __iomem *base;
48 int ret;
49
50 ret = pcim_enable_device(pdev);
51 if (ret)
52 return ret;
53
54 info = devm_kmemdup(dev: &pdev->dev, src: (void *)id->driver_data, len: sizeof(*info),
55 GFP_KERNEL);
56 if (!info)
57 return -ENOMEM;
58
59 info->data = pdev;
60
61 base = pcim_iomap_region(pdev, bar: 0, KBUILD_MODNAME);
62 if (IS_ERR(ptr: base))
63 return PTR_ERR(ptr: base);
64
65 return intel_spi_probe(dev: &pdev->dev, base, info);
66}
67
68static const struct pci_device_id intel_spi_pci_ids[] = {
69 { PCI_VDEVICE(INTEL, 0x02a4), (unsigned long)&cnl_info },
70 { PCI_VDEVICE(INTEL, 0x06a4), .vendor: (unsigned long)&cnl_info },
71 { PCI_VDEVICE(INTEL, 0x18e0), (unsigned long)&bxt_info },
72 { PCI_VDEVICE(INTEL, 0x19e0), .vendor: (unsigned long)&bxt_info },
73 { PCI_VDEVICE(INTEL, 0x1bca), (unsigned long)&bxt_info },
74 { PCI_VDEVICE(INTEL, 0x34a4), .vendor: (unsigned long)&cnl_info },
75 { PCI_VDEVICE(INTEL, 0x38a4), (unsigned long)&bxt_info },
76 { PCI_VDEVICE(INTEL, 0x43a4), .vendor: (unsigned long)&cnl_info },
77 { PCI_VDEVICE(INTEL, 0x4b24), (unsigned long)&bxt_info },
78 { PCI_VDEVICE(INTEL, 0x4da4), .vendor: (unsigned long)&bxt_info },
79 { PCI_VDEVICE(INTEL, 0x51a4), (unsigned long)&cnl_info },
80 { PCI_VDEVICE(INTEL, 0x54a4), .vendor: (unsigned long)&cnl_info },
81 { PCI_VDEVICE(INTEL, 0x5794), (unsigned long)&cnl_info },
82 { PCI_VDEVICE(INTEL, 0x7a24), .vendor: (unsigned long)&cnl_info },
83 { PCI_VDEVICE(INTEL, 0x7aa4), (unsigned long)&cnl_info },
84 { PCI_VDEVICE(INTEL, 0x7e23), .vendor: (unsigned long)&cnl_info },
85 { PCI_VDEVICE(INTEL, 0x7f24), (unsigned long)&cnl_info },
86 { PCI_VDEVICE(INTEL, 0x9d24), .vendor: (unsigned long)&cnl_info },
87 { PCI_VDEVICE(INTEL, 0x9da4), (unsigned long)&cnl_info },
88 { PCI_VDEVICE(INTEL, 0xa0a4), .vendor: (unsigned long)&cnl_info },
89 { PCI_VDEVICE(INTEL, 0xa1a4), (unsigned long)&bxt_info },
90 { PCI_VDEVICE(INTEL, 0xa224), .vendor: (unsigned long)&bxt_info },
91 { PCI_VDEVICE(INTEL, 0xa2a4), (unsigned long)&cnl_info },
92 { PCI_VDEVICE(INTEL, 0xa324), .vendor: (unsigned long)&cnl_info },
93 { PCI_VDEVICE(INTEL, 0xa3a4), (unsigned long)&cnl_info },
94 { PCI_VDEVICE(INTEL, 0xa823), .vendor: (unsigned long)&cnl_info },
95 { PCI_VDEVICE(INTEL, 0xe323), (unsigned long)&cnl_info },
96 { PCI_VDEVICE(INTEL, 0xe423), .vendor: (unsigned long)&cnl_info },
97 { },
98};
99MODULE_DEVICE_TABLE(pci, intel_spi_pci_ids);
100
101static struct pci_driver intel_spi_pci_driver = {
102 .name = "intel-spi",
103 .id_table = intel_spi_pci_ids,
104 .probe = intel_spi_pci_probe,
105 .dev_groups = intel_spi_groups,
106};
107
108module_pci_driver(intel_spi_pci_driver);
109
110MODULE_DESCRIPTION("Intel PCH/PCU SPI flash PCI driver");
111MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");
112MODULE_LICENSE("GPL v2");
113

source code of linux/drivers/spi/spi-intel-pci.c