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
23static struct pci_driver pasemi_smb_pci_driver;
24
25static 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;
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
69static const struct pci_device_id pasemi_smb_pci_ids[] = {
70	{ PCI_DEVICE(0x1959, 0xa003) },
71	{ 0, }
72};
73
74MODULE_DEVICE_TABLE(pci, pasemi_smb_pci_ids);
75
76static 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
82module_pci_driver(pasemi_smb_pci_driver);
83
84MODULE_LICENSE("GPL");
85MODULE_AUTHOR("Olof Johansson <olof@lixom.net>");
86MODULE_DESCRIPTION("PA Semi PWRficient SMBus driver");
87