blob: b5918196564376b028e825ccc75131ae74b1cdd0 [file] [log] [blame]
Johannes Thumshirnb71bb862014-02-26 17:29:06 +01001/*
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
Johannes Thumshirn4ec65b72014-04-24 14:35:25 +020023static int mcb_pci_get_irq(struct mcb_device *mdev)
24{
25 struct mcb_bus *mbus = mdev->bus;
26 struct device *dev = mbus->carrier;
27 struct pci_dev *pdev = to_pci_dev(dev);
28
29 return pdev->irq;
30}
31
Johannes Thumshirnb71bb862014-02-26 17:29:06 +010032static int mcb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
33{
34 struct priv *priv;
35 phys_addr_t mapbase;
36 int ret;
37 int num_cells;
38 unsigned long flags;
39
40 priv = devm_kzalloc(&pdev->dev, sizeof(struct priv), GFP_KERNEL);
41 if (!priv)
42 return -ENOMEM;
43
44 ret = pci_enable_device(pdev);
45 if (ret) {
46 dev_err(&pdev->dev, "Failed to enable PCI device\n");
47 return -ENODEV;
48 }
49
50 mapbase = pci_resource_start(pdev, 0);
51 if (!mapbase) {
52 dev_err(&pdev->dev, "No PCI resource\n");
53 goto err_start;
54 }
55
56 ret = pci_request_region(pdev, 0, KBUILD_MODNAME);
57 if (ret) {
58 dev_err(&pdev->dev, "Failed to request PCI BARs\n");
59 goto err_start;
60 }
61
62 priv->base = pci_iomap(pdev, 0, 0);
63 if (!priv->base) {
64 dev_err(&pdev->dev, "Cannot ioremap\n");
65 ret = -ENOMEM;
66 goto err_ioremap;
67 }
68
69 flags = pci_resource_flags(pdev, 0);
70 if (flags & IORESOURCE_IO) {
71 ret = -ENOTSUPP;
72 dev_err(&pdev->dev,
73 "IO mapped PCI devices are not supported\n");
74 goto err_ioremap;
75 }
76
77 pci_set_drvdata(pdev, priv);
78
Johannes Thumshirn4ec65b72014-04-24 14:35:25 +020079 priv->bus = mcb_alloc_bus(&pdev->dev);
80 if (IS_ERR(priv->bus)) {
81 ret = PTR_ERR(priv->bus);
82 goto err_drvdata;
83 }
84
85 priv->bus->get_irq = mcb_pci_get_irq;
Johannes Thumshirnb71bb862014-02-26 17:29:06 +010086
87 ret = chameleon_parse_cells(priv->bus, mapbase, priv->base);
88 if (ret < 0)
89 goto err_drvdata;
90 num_cells = ret;
91
92 dev_dbg(&pdev->dev, "Found %d cells\n", num_cells);
93
94 mcb_bus_add_devices(priv->bus);
95
96err_drvdata:
97 pci_iounmap(pdev, priv->base);
98err_ioremap:
99 pci_release_region(pdev, 0);
100err_start:
101 pci_disable_device(pdev);
102 return ret;
103}
104
105static void mcb_pci_remove(struct pci_dev *pdev)
106{
107 struct priv *priv = pci_get_drvdata(pdev);
108
109 mcb_release_bus(priv->bus);
110}
111
112static const struct pci_device_id mcb_pci_tbl[] = {
113 { PCI_DEVICE(PCI_VENDOR_ID_MEN, PCI_DEVICE_ID_MEN_CHAMELEON) },
114 { 0 },
115};
116MODULE_DEVICE_TABLE(pci, mcb_pci_tbl);
117
118static struct pci_driver mcb_pci_driver = {
119 .name = "mcb-pci",
120 .id_table = mcb_pci_tbl,
121 .probe = mcb_pci_probe,
122 .remove = mcb_pci_remove,
123};
124
125module_pci_driver(mcb_pci_driver);
126
127MODULE_AUTHOR("Johannes Thumshirn <johannes.thumshirn@men.de>");
128MODULE_LICENSE("GPL");
129MODULE_DESCRIPTION("MCB over PCI support");