1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2006-2007 PA Semi, Inc
4  *
5  * SMBus host driver for PA Semi PWRficient
6  */
7 
8 #include <linux/module.h>
9 #include <linux/pci.h>
10 #include <linux/kernel.h>
11 #include <linux/stddef.h>
12 #include <linux/sched.h>
13 #include <linux/i2c.h>
14 #include <linux/delay.h>
15 #include <linux/slab.h>
16 #include <linux/io.h>
17 
18 #include "i2c-pasemi-core.h"
19 
20 #define CLK_100K_DIV	84
21 #define CLK_400K_DIV	21
22 
23 static struct pci_driver pasemi_smb_pci_driver;
24 
25 static int pasemi_smb_pci_probe(struct pci_dev *dev,
26 				      const struct pci_device_id *id)
27 {
28 	struct pasemi_smbus *smbus;
29 	unsigned long base;
30 	int size;
31 	int error;
32 
33 	if (!(pci_resource_flags(dev, 0) & IORESOURCE_IO))
34 		return -ENODEV;
35 
36 	smbus = devm_kzalloc(&dev->dev, sizeof(*smbus), GFP_KERNEL);
37 	if (!smbus)
38 		return -ENOMEM;
39 
40 	smbus->dev = &dev->dev;
41 	base = pci_resource_start(dev, 0);
42 	size = pci_resource_len(dev, 0);
43 	smbus->clk_div = CLK_100K_DIV;
44 
45 	/*
46 	 * The original PASemi PCI controllers don't have a register for
47 	 * their HW revision.
48 	 */
49 	smbus->hw_rev = PASEMI_HW_REV_PCI;
50 
51 	if (!devm_request_region(&dev->dev, base, size,
52 			    pasemi_smb_pci_driver.name))
53 		return -EBUSY;
54 
55 	smbus->ioaddr = pcim_iomap(dev, 0, 0);
56 	if (!smbus->ioaddr)
57 		return -EBUSY;
58 
59 	smbus->adapter.class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
60 	error = pasemi_i2c_common_probe(smbus);
61 	if (error)
62 		return error;
63 
64 	pci_set_drvdata(dev, smbus);
65 
66 	return 0;
67 }
68 
69 static const struct pci_device_id pasemi_smb_pci_ids[] = {
70 	{ PCI_DEVICE(0x1959, 0xa003) },
71 	{ 0, }
72 };
73 
74 MODULE_DEVICE_TABLE(pci, pasemi_smb_pci_ids);
75 
76 static struct pci_driver pasemi_smb_pci_driver = {
77 	.name		= "i2c-pasemi",
78 	.id_table	= pasemi_smb_pci_ids,
79 	.probe		= pasemi_smb_pci_probe,
80 };
81 
82 module_pci_driver(pasemi_smb_pci_driver);
83 
84 MODULE_LICENSE("GPL");
85 MODULE_AUTHOR("Olof Johansson <olof@lixom.net>");
86 MODULE_DESCRIPTION("PA Semi PWRficient SMBus driver");
87