1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * CE4100 PCI-I2C glue code for PXA's driver
4 * Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
5 *
6 * The CE4100's I2C device is more or less the same one as found on PXA.
7 * It does not support slave mode, the register slightly moved. This PCI
8 * device provides three bars, every contains a single I2C controller.
9 */
10#include <linux/init.h>
11#include <linux/pci.h>
12#include <linux/platform_device.h>
13#include <linux/platform_data/i2c-pxa.h>
14#include <linux/of.h>
15#include <linux/of_address.h>
16
17#define CE4100_PCI_I2C_DEVS	3
18
19struct ce4100_devices {
20	struct platform_device *pdev[CE4100_PCI_I2C_DEVS];
21};
22
23static struct platform_device *add_i2c_device(struct pci_dev *dev, int bar)
24{
25	struct platform_device *pdev;
26	struct i2c_pxa_platform_data pdata;
27	struct resource res[2];
28	struct device_node *child;
29	static int devnum;
30	int ret;
31
32	memset(&pdata, 0, sizeof(struct i2c_pxa_platform_data));
33	memset(&res, 0, sizeof(res));
34
35	res[0].flags = IORESOURCE_MEM;
36	res[0].start = pci_resource_start(dev, bar);
37	res[0].end = pci_resource_end(dev, bar);
38
39	res[1].flags = IORESOURCE_IRQ;
40	res[1].start = dev->irq;
41	res[1].end = dev->irq;
42
43	for_each_child_of_node(dev->dev.of_node, child) {
44		const void *prop;
45		struct resource r;
46		int ret;
47
48		ret = of_address_to_resource(child, 0, &r);
49		if (ret < 0)
50			continue;
51		if (r.start != res[0].start)
52			continue;
53		if (r.end != res[0].end)
54			continue;
55		if (r.flags != res[0].flags)
56			continue;
57
58		prop = of_get_property(child, "fast-mode", NULL);
59		if (prop)
60			pdata.fast_mode = 1;
61
62		break;
63	}
64
65	if (!child) {
66		dev_err(&dev->dev, "failed to match a DT node for bar %d.\n",
67				bar);
68		ret = -EINVAL;
69		goto out;
70	}
71
72	pdev = platform_device_alloc("ce4100-i2c", devnum);
73	if (!pdev) {
74		of_node_put(child);
75		ret = -ENOMEM;
76		goto out;
77	}
78	pdev->dev.parent = &dev->dev;
79	pdev->dev.of_node = child;
80
81	ret = platform_device_add_resources(pdev, res, ARRAY_SIZE(res));
82	if (ret)
83		goto err;
84
85	ret = platform_device_add_data(pdev, &pdata, sizeof(pdata));
86	if (ret)
87		goto err;
88
89	ret = platform_device_add(pdev);
90	if (ret)
91		goto err;
92	devnum++;
93	return pdev;
94err:
95	platform_device_put(pdev);
96out:
97	return ERR_PTR(ret);
98}
99
100static int ce4100_i2c_probe(struct pci_dev *dev,
101		const struct pci_device_id *ent)
102{
103	int ret;
104	int i;
105	struct ce4100_devices *sds;
106
107	ret = pcim_enable_device(dev);
108	if (ret)
109		return ret;
110
111	if (!dev->dev.of_node) {
112		dev_err(&dev->dev, "Missing device tree node.\n");
113		return -EINVAL;
114	}
115	sds = kzalloc(sizeof(*sds), GFP_KERNEL);
116	if (!sds)
117		return -ENOMEM;
118
119	for (i = 0; i < ARRAY_SIZE(sds->pdev); i++) {
120		sds->pdev[i] = add_i2c_device(dev, i);
121		if (IS_ERR(sds->pdev[i])) {
122			ret = PTR_ERR(sds->pdev[i]);
123			while (--i >= 0)
124				platform_device_unregister(sds->pdev[i]);
125			goto err_dev_add;
126		}
127	}
128	pci_set_drvdata(dev, sds);
129	return 0;
130
131err_dev_add:
132	kfree(sds);
133	return ret;
134}
135
136static const struct pci_device_id ce4100_i2c_devices[] = {
137	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x2e68)},
138	{ },
139};
140
141static struct pci_driver ce4100_i2c_driver = {
142	.driver = {
143		.suppress_bind_attrs = true,
144	},
145	.name           = "ce4100_i2c",
146	.id_table       = ce4100_i2c_devices,
147	.probe          = ce4100_i2c_probe,
148};
149builtin_pci_driver(ce4100_i2c_driver);
150