mcb-pci.c revision b71bb8639891827051af88d8dfb17ca608b6ae88 
1/*
2 * MEN Chameleon Bus.
3 *
4 * Copyright (C) 2014 MEN Mikroelektronik GmbH (www.men.de)
5 * Author: Johannes Thumshirn <johannes.thumshirn@men.de>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the Free
9 * Software Foundation; version 2 of the License.
10 */
11
12#include <linux/module.h>
13#include <linux/pci.h>
14#include <linux/mcb.h>
15
16#include "mcb-internal.h"
17
18struct priv {
19	struct mcb_bus *bus;
20	void __iomem *base;
21};
22
23static int mcb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
24{
25	struct priv *priv;
26	phys_addr_t mapbase;
27	int ret;
28	int num_cells;
29	unsigned long flags;
30
31	priv = devm_kzalloc(&pdev->dev, sizeof(struct priv), GFP_KERNEL);
32	if (!priv)
33		return -ENOMEM;
34
35	ret = pci_enable_device(pdev);
36	if (ret) {
37		dev_err(&pdev->dev, "Failed to enable PCI device\n");
38		return -ENODEV;
39	}
40
41	mapbase = pci_resource_start(pdev, 0);
42	if (!mapbase) {
43		dev_err(&pdev->dev, "No PCI resource\n");
44		goto err_start;
45	}
46
47	ret = pci_request_region(pdev, 0, KBUILD_MODNAME);
48	if (ret) {
49		dev_err(&pdev->dev, "Failed to request PCI BARs\n");
50		goto err_start;
51	}
52
53	priv->base = pci_iomap(pdev, 0, 0);
54	if (!priv->base) {
55		dev_err(&pdev->dev, "Cannot ioremap\n");
56		ret = -ENOMEM;
57		goto err_ioremap;
58	}
59
60	flags = pci_resource_flags(pdev, 0);
61	if (flags & IORESOURCE_IO) {
62		ret = -ENOTSUPP;
63		dev_err(&pdev->dev,
64			"IO mapped PCI devices are not supported\n");
65		goto err_ioremap;
66	}
67
68	pci_set_drvdata(pdev, priv);
69
70	priv->bus = mcb_alloc_bus();
71
72	ret = chameleon_parse_cells(priv->bus, mapbase, priv->base);
73	if (ret < 0)
74		goto err_drvdata;
75	num_cells = ret;
76
77	dev_dbg(&pdev->dev, "Found %d cells\n", num_cells);
78
79	mcb_bus_add_devices(priv->bus);
80
81err_drvdata:
82	pci_iounmap(pdev, priv->base);
83err_ioremap:
84	pci_release_region(pdev, 0);
85err_start:
86	pci_disable_device(pdev);
87	return ret;
88}
89
90static void mcb_pci_remove(struct pci_dev *pdev)
91{
92	struct priv *priv = pci_get_drvdata(pdev);
93
94	mcb_release_bus(priv->bus);
95}
96
97static const struct pci_device_id mcb_pci_tbl[] = {
98	{ PCI_DEVICE(PCI_VENDOR_ID_MEN, PCI_DEVICE_ID_MEN_CHAMELEON) },
99	{ 0 },
100};
101MODULE_DEVICE_TABLE(pci, mcb_pci_tbl);
102
103static struct pci_driver mcb_pci_driver = {
104	.name = "mcb-pci",
105	.id_table = mcb_pci_tbl,
106	.probe = mcb_pci_probe,
107	.remove = mcb_pci_remove,
108};
109
110module_pci_driver(mcb_pci_driver);
111
112MODULE_AUTHOR("Johannes Thumshirn <johannes.thumshirn@men.de>");
113MODULE_LICENSE("GPL");
114MODULE_DESCRIPTION("MCB over PCI support");
115