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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; | |
7b7c5491 | 20 | phys_addr_t mapbase; |
b71bb863 JT |
21 | void __iomem *base; |
22 | }; | |
23 | ||
4ec65b77 JT |
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 | ||
b71bb863 JT |
33 | static int mcb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) |
34 | { | |
7b7c5491 | 35 | struct resource *res; |
b71bb863 | 36 | struct priv *priv; |
b71bb863 JT |
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 | ||
7b7c5491 JT |
51 | priv->mapbase = pci_resource_start(pdev, 0); |
52 | if (!priv->mapbase) { | |
b71bb863 JT |
53 | dev_err(&pdev->dev, "No PCI resource\n"); |
54 | goto err_start; | |
55 | } | |
56 | ||
7b7c5491 JT |
57 | res = request_mem_region(priv->mapbase, CHAM_HEADER_SIZE, |
58 | KBUILD_MODNAME); | |
59 | if (IS_ERR(res)) { | |
60 | dev_err(&pdev->dev, "Failed to request PCI memory\n"); | |
61 | ret = PTR_ERR(res); | |
b71bb863 JT |
62 | goto err_start; |
63 | } | |
64 | ||
7b7c5491 | 65 | priv->base = ioremap(priv->mapbase, CHAM_HEADER_SIZE); |
b71bb863 JT |
66 | if (!priv->base) { |
67 | dev_err(&pdev->dev, "Cannot ioremap\n"); | |
68 | ret = -ENOMEM; | |
69 | goto err_ioremap; | |
70 | } | |
71 | ||
72 | flags = pci_resource_flags(pdev, 0); | |
73 | if (flags & IORESOURCE_IO) { | |
74 | ret = -ENOTSUPP; | |
75 | dev_err(&pdev->dev, | |
76 | "IO mapped PCI devices are not supported\n"); | |
77 | goto err_ioremap; | |
78 | } | |
79 | ||
80 | pci_set_drvdata(pdev, priv); | |
81 | ||
4ec65b77 JT |
82 | priv->bus = mcb_alloc_bus(&pdev->dev); |
83 | if (IS_ERR(priv->bus)) { | |
84 | ret = PTR_ERR(priv->bus); | |
85 | goto err_drvdata; | |
86 | } | |
87 | ||
88 | priv->bus->get_irq = mcb_pci_get_irq; | |
b71bb863 | 89 | |
7b7c5491 | 90 | ret = chameleon_parse_cells(priv->bus, priv->mapbase, priv->base); |
b71bb863 JT |
91 | if (ret < 0) |
92 | goto err_drvdata; | |
93 | num_cells = ret; | |
94 | ||
95 | dev_dbg(&pdev->dev, "Found %d cells\n", num_cells); | |
96 | ||
97 | mcb_bus_add_devices(priv->bus); | |
98 | ||
7b7c5491 JT |
99 | return 0; |
100 | ||
b71bb863 | 101 | err_drvdata: |
7b7c5491 | 102 | iounmap(priv->base); |
b71bb863 JT |
103 | err_ioremap: |
104 | pci_release_region(pdev, 0); | |
105 | err_start: | |
106 | pci_disable_device(pdev); | |
107 | return ret; | |
108 | } | |
109 | ||
110 | static void mcb_pci_remove(struct pci_dev *pdev) | |
111 | { | |
112 | struct priv *priv = pci_get_drvdata(pdev); | |
113 | ||
114 | mcb_release_bus(priv->bus); | |
7b7c5491 JT |
115 | |
116 | iounmap(priv->base); | |
117 | release_region(priv->mapbase, CHAM_HEADER_SIZE); | |
118 | pci_disable_device(pdev); | |
b71bb863 JT |
119 | } |
120 | ||
121 | static const struct pci_device_id mcb_pci_tbl[] = { | |
122 | { PCI_DEVICE(PCI_VENDOR_ID_MEN, PCI_DEVICE_ID_MEN_CHAMELEON) }, | |
123 | { 0 }, | |
124 | }; | |
125 | MODULE_DEVICE_TABLE(pci, mcb_pci_tbl); | |
126 | ||
127 | static struct pci_driver mcb_pci_driver = { | |
128 | .name = "mcb-pci", | |
129 | .id_table = mcb_pci_tbl, | |
130 | .probe = mcb_pci_probe, | |
131 | .remove = mcb_pci_remove, | |
132 | }; | |
133 | ||
134 | module_pci_driver(mcb_pci_driver); | |
135 | ||
136 | MODULE_AUTHOR("Johannes Thumshirn <johannes.thumshirn@men.de>"); | |
137 | MODULE_LICENSE("GPL"); | |
138 | MODULE_DESCRIPTION("MCB over PCI support"); |