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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 | ||
23 | static 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 | ||
81 | err_drvdata: | |
82 | pci_iounmap(pdev, priv->base); | |
83 | err_ioremap: | |
84 | pci_release_region(pdev, 0); | |
85 | err_start: | |
86 | pci_disable_device(pdev); | |
87 | return ret; | |
88 | } | |
89 | ||
90 | static 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 | ||
97 | static const struct pci_device_id mcb_pci_tbl[] = { | |
98 | { PCI_DEVICE(PCI_VENDOR_ID_MEN, PCI_DEVICE_ID_MEN_CHAMELEON) }, | |
99 | { 0 }, | |
100 | }; | |
101 | MODULE_DEVICE_TABLE(pci, mcb_pci_tbl); | |
102 | ||
103 | static 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 | ||
110 | module_pci_driver(mcb_pci_driver); | |
111 | ||
112 | MODULE_AUTHOR("Johannes Thumshirn <johannes.thumshirn@men.de>"); | |
113 | MODULE_LICENSE("GPL"); | |
114 | MODULE_DESCRIPTION("MCB over PCI support"); |