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)&cnl_info },
64 	{ PCI_VDEVICE(INTEL, 0x06a4), (unsigned long)&cnl_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)&cnl_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, 0x9d24), (unsigned long)&cnl_info },
79 	{ PCI_VDEVICE(INTEL, 0x9da4), (unsigned long)&cnl_info },
80 	{ PCI_VDEVICE(INTEL, 0xa0a4), (unsigned long)&cnl_info },
81 	{ PCI_VDEVICE(INTEL, 0xa1a4), (unsigned long)&bxt_info },
82 	{ PCI_VDEVICE(INTEL, 0xa224), (unsigned long)&bxt_info },
83 	{ PCI_VDEVICE(INTEL, 0xa2a4), (unsigned long)&cnl_info },
84 	{ PCI_VDEVICE(INTEL, 0xa324), (unsigned long)&cnl_info },
85 	{ PCI_VDEVICE(INTEL, 0xa3a4), (unsigned long)&cnl_info },
86 	{ },
87 };
88 MODULE_DEVICE_TABLE(pci, intel_spi_pci_ids);
89 
90 static struct pci_driver intel_spi_pci_driver = {
91 	.name = "intel-spi",
92 	.id_table = intel_spi_pci_ids,
93 	.probe = intel_spi_pci_probe,
94 };
95 
96 module_pci_driver(intel_spi_pci_driver);
97 
98 MODULE_DESCRIPTION("Intel PCH/PCU SPI flash PCI driver");
99 MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");
100 MODULE_LICENSE("GPL v2");
101