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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Minimalist driver for a generic PCI-to-EISA bridge. | |
3 | * | |
4 | * (C) 2003 Marc Zyngier <maz@wild-wind.fr.eu.org> | |
5 | * | |
6 | * This code is released under the GPL version 2. | |
7 | * | |
8 | * Ivan Kokshaysky <ink@jurassic.park.msu.ru> : | |
9 | * Generalisation from i82375 to PCI_CLASS_BRIDGE_EISA. | |
10 | */ | |
11 | ||
12 | #include <linux/kernel.h> | |
13 | #include <linux/device.h> | |
14 | #include <linux/eisa.h> | |
15 | #include <linux/pci.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/init.h> | |
18 | ||
19 | /* There is only *one* pci_eisa device per machine, right ? */ | |
20 | static struct eisa_root_device pci_eisa_root; | |
21 | ||
c5fb301a | 22 | static int __init pci_eisa_init(struct pci_dev *pdev) |
1da177e4 | 23 | { |
2cfda637 YL |
24 | int rc, i; |
25 | struct resource *res, *bus_res = NULL; | |
1da177e4 LT |
26 | |
27 | if ((rc = pci_enable_device (pdev))) { | |
28 | printk (KERN_ERR "pci_eisa : Could not enable device %s\n", | |
29 | pci_name(pdev)); | |
30 | return rc; | |
31 | } | |
32 | ||
2cfda637 YL |
33 | /* |
34 | * The Intel 82375 PCI-EISA bridge is a subtractive-decode PCI | |
35 | * device, so the resources available on EISA are the same as those | |
36 | * available on the 82375 bus. This works the same as a PCI-PCI | |
37 | * bridge in subtractive-decode mode (see pci_read_bridge_bases()). | |
38 | * We assume other PCI-EISA bridges are similar. | |
39 | * | |
40 | * eisa_root_register() can only deal with a single io port resource, | |
41 | * so we use the first valid io port resource. | |
42 | */ | |
43 | pci_bus_for_each_resource(pdev->bus, res, i) | |
44 | if (res && (res->flags & IORESOURCE_IO)) { | |
45 | bus_res = res; | |
46 | break; | |
47 | } | |
48 | ||
49 | if (!bus_res) { | |
50 | dev_err(&pdev->dev, "No resources available\n"); | |
51 | return -1; | |
52 | } | |
53 | ||
1da177e4 | 54 | pci_eisa_root.dev = &pdev->dev; |
2cfda637 YL |
55 | pci_eisa_root.res = bus_res; |
56 | pci_eisa_root.bus_base_addr = bus_res->start; | |
1da177e4 LT |
57 | pci_eisa_root.slots = EISA_MAX_SLOTS; |
58 | pci_eisa_root.dma_mask = pdev->dma_mask; | |
4b9d0d3b | 59 | dev_set_drvdata(pci_eisa_root.dev, &pci_eisa_root); |
1da177e4 LT |
60 | |
61 | if (eisa_root_register (&pci_eisa_root)) { | |
62 | printk (KERN_ERR "pci_eisa : Could not register EISA root\n"); | |
63 | return -1; | |
64 | } | |
65 | ||
66 | return 0; | |
67 | } | |
68 | ||
c5fb301a YL |
69 | /* |
70 | * We have to call pci_eisa_init_early() before pnpacpi_init()/isapnp_init(). | |
71 | * Otherwise pnp resource will get enabled early and could prevent eisa | |
72 | * to be initialized. | |
73 | * Also need to make sure pci_eisa_init_early() is called after | |
74 | * x86/pci_subsys_init(). | |
75 | * So need to use subsys_initcall_sync with it. | |
76 | */ | |
77 | static int __init pci_eisa_init_early(void) | |
78 | { | |
79 | struct pci_dev *dev = NULL; | |
80 | int ret; | |
1da177e4 | 81 | |
c5fb301a YL |
82 | for_each_pci_dev(dev) |
83 | if ((dev->class >> 8) == PCI_CLASS_BRIDGE_EISA) { | |
84 | ret = pci_eisa_init(dev); | |
85 | if (ret) | |
86 | return ret; | |
87 | } | |
1da177e4 | 88 | |
c5fb301a | 89 | return 0; |
1da177e4 | 90 | } |
c5fb301a | 91 | subsys_initcall_sync(pci_eisa_init_early); |