1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2007 PA Semi, Inc
4 *
5 * Parts based on arch/powerpc/sysdev/fsl_soc.c:
6 *
7 * 2006 (c) MontaVista Software, Inc.
8 */
9
10#include <linux/errno.h>
11#include <linux/kernel.h>
12#include <linux/pci.h>
13#include <linux/of.h>
14#include <linux/of_irq.h>
15#include <linux/i2c.h>
16
17#ifdef CONFIG_I2C_BOARDINFO
18/* The below is from fsl_soc.c.  It's copied because since there are no
19 * official bus bindings at this time it doesn't make sense to share across
20 * the platforms, even though they happen to be common.
21 */
22struct i2c_driver_device {
23	char    *of_device;
24	char    *i2c_type;
25};
26
27static struct i2c_driver_device i2c_devices[] __initdata = {
28	{"dallas,ds1338",  "ds1338"},
29};
30
31static int __init find_i2c_driver(struct device_node *node,
32				     struct i2c_board_info *info)
33{
34	int i;
35
36	for (i = 0; i < ARRAY_SIZE(i2c_devices); i++) {
37		if (!of_device_is_compatible(node, i2c_devices[i].of_device))
38			continue;
39		if (strscpy(info->type, i2c_devices[i].i2c_type, I2C_NAME_SIZE) < 0)
40			return -ENOMEM;
41		return 0;
42	}
43	return -ENODEV;
44}
45
46static int __init pasemi_register_i2c_devices(void)
47{
48	struct pci_dev *pdev;
49	struct device_node *adap_node;
50	struct device_node *node;
51
52	pdev = NULL;
53	while ((pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa003, pdev))) {
54		adap_node = pci_device_to_OF_node(pdev);
55
56		if (!adap_node)
57			continue;
58
59		for_each_child_of_node(adap_node, node) {
60			struct i2c_board_info info = {};
61			const u32 *addr;
62			int len;
63
64			addr = of_get_property(node, "reg", &len);
65			if (!addr || len < sizeof(int) ||
66			    *addr > (1 << 10) - 1) {
67				pr_warn("pasemi_register_i2c_devices: invalid i2c device entry\n");
68				continue;
69			}
70
71			info.irq = irq_of_parse_and_map(node, 0);
72			if (!info.irq)
73				info.irq = -1;
74
75			if (find_i2c_driver(node, &info) < 0)
76				continue;
77
78			info.addr = *addr;
79
80			i2c_register_board_info(PCI_FUNC(pdev->devfn), &info,
81						1);
82		}
83	}
84	return 0;
85}
86device_initcall(pasemi_register_i2c_devices);
87#endif
88