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
18 struct priv {
19 struct mcb_bus *bus;
20 phys_addr_t mapbase;
21 void __iomem *base;
22 };
23
mcb_pci_get_irq(struct mcb_device * mdev)24 static int mcb_pci_get_irq(struct mcb_device *mdev)
25 {
26 struct mcb_bus *mbus = mdev->bus;
27 struct device *dev = mbus->carrier;
28 struct pci_dev *pdev = to_pci_dev(dev);
29
30 return pdev->irq;
31 }
32
mcb_pci_probe(struct pci_dev * pdev,const struct pci_device_id * id)33 static int mcb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
34 {
35 struct resource *res;
36 struct priv *priv;
37 int ret;
38 int num_cells;
39 unsigned long flags;
40
41 priv = devm_kzalloc(&pdev->dev, sizeof(struct priv), GFP_KERNEL);
42 if (!priv)
43 return -ENOMEM;
44
45 ret = pci_enable_device(pdev);
46 if (ret) {
47 dev_err(&pdev->dev, "Failed to enable PCI device\n");
48 return -ENODEV;
49 }
50
51 priv->mapbase = pci_resource_start(pdev, 0);
52 if (!priv->mapbase) {
53 dev_err(&pdev->dev, "No PCI resource\n");
54 ret = -ENODEV;
55 goto out_disable;
56 }
57
58 res = request_mem_region(priv->mapbase, CHAM_HEADER_SIZE,
59 KBUILD_MODNAME);
60 if (!res) {
61 dev_err(&pdev->dev, "Failed to request PCI memory\n");
62 ret = -EBUSY;
63 goto out_disable;
64 }
65
66 priv->base = ioremap(priv->mapbase, CHAM_HEADER_SIZE);
67 if (!priv->base) {
68 dev_err(&pdev->dev, "Cannot ioremap\n");
69 ret = -ENOMEM;
70 goto out_release;
71 }
72
73 flags = pci_resource_flags(pdev, 0);
74 if (flags & IORESOURCE_IO) {
75 ret = -ENOTSUPP;
76 dev_err(&pdev->dev,
77 "IO mapped PCI devices are not supported\n");
78 goto out_iounmap;
79 }
80
81 pci_set_drvdata(pdev, priv);
82
83 priv->bus = mcb_alloc_bus(&pdev->dev);
84 if (IS_ERR(priv->bus)) {
85 ret = PTR_ERR(priv->bus);
86 goto out_iounmap;
87 }
88
89 priv->bus->get_irq = mcb_pci_get_irq;
90
91 ret = chameleon_parse_cells(priv->bus, priv->mapbase, priv->base);
92 if (ret < 0)
93 goto out_mcb_bus;
94 num_cells = ret;
95
96 dev_dbg(&pdev->dev, "Found %d cells\n", num_cells);
97
98 mcb_bus_add_devices(priv->bus);
99
100 return 0;
101
102 out_mcb_bus:
103 mcb_release_bus(priv->bus);
104 out_iounmap:
105 iounmap(priv->base);
106 out_release:
107 pci_release_region(pdev, 0);
108 out_disable:
109 pci_disable_device(pdev);
110 return ret;
111 }
112
mcb_pci_remove(struct pci_dev * pdev)113 static void mcb_pci_remove(struct pci_dev *pdev)
114 {
115 struct priv *priv = pci_get_drvdata(pdev);
116
117 mcb_release_bus(priv->bus);
118
119 iounmap(priv->base);
120 release_region(priv->mapbase, CHAM_HEADER_SIZE);
121 pci_disable_device(pdev);
122 }
123
124 static const struct pci_device_id mcb_pci_tbl[] = {
125 { PCI_DEVICE(PCI_VENDOR_ID_MEN, PCI_DEVICE_ID_MEN_CHAMELEON) },
126 { 0 },
127 };
128 MODULE_DEVICE_TABLE(pci, mcb_pci_tbl);
129
130 static struct pci_driver mcb_pci_driver = {
131 .name = "mcb-pci",
132 .id_table = mcb_pci_tbl,
133 .probe = mcb_pci_probe,
134 .remove = mcb_pci_remove,
135 };
136
137 module_pci_driver(mcb_pci_driver);
138
139 MODULE_AUTHOR("Johannes Thumshirn <johannes.thumshirn@men.de>");
140 MODULE_LICENSE("GPL");
141 MODULE_DESCRIPTION("MCB over PCI support");
142