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b71bb863 JT |
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 | void __iomem *base; | |
21 | }; | |
22 | ||
4ec65b77 JT |
23 | static 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 | ||
b71bb863 JT |
32 | static 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 | ||
4ec65b77 JT |
79 | 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; | |
b71bb863 JT |
86 | |
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 | ||
96 | err_drvdata: | |
97 | pci_iounmap(pdev, priv->base); | |
98 | err_ioremap: | |
99 | pci_release_region(pdev, 0); | |
100 | err_start: | |
101 | pci_disable_device(pdev); | |
102 | return ret; | |
103 | } | |
104 | ||
105 | static 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 | ||
112 | static const struct pci_device_id mcb_pci_tbl[] = { | |
113 | { PCI_DEVICE(PCI_VENDOR_ID_MEN, PCI_DEVICE_ID_MEN_CHAMELEON) }, | |
114 | { 0 }, | |
115 | }; | |
116 | MODULE_DEVICE_TABLE(pci, mcb_pci_tbl); | |
117 | ||
118 | static 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 | ||
125 | module_pci_driver(mcb_pci_driver); | |
126 | ||
127 | MODULE_AUTHOR("Johannes Thumshirn <johannes.thumshirn@men.de>"); | |
128 | MODULE_LICENSE("GPL"); | |
129 | MODULE_DESCRIPTION("MCB over PCI support"); |