Commit | Line | Data |
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d1d24ed4 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * Minimalist driver for a generic PCI-to-EISA bridge. | |
4 | * | |
5 | * (C) 2003 Marc Zyngier <maz@wild-wind.fr.eu.org> | |
6 | * | |
1da177e4 LT |
7 | * Ivan Kokshaysky <ink@jurassic.park.msu.ru> : |
8 | * Generalisation from i82375 to PCI_CLASS_BRIDGE_EISA. | |
9 | */ | |
10 | ||
11 | #include <linux/kernel.h> | |
12 | #include <linux/device.h> | |
13 | #include <linux/eisa.h> | |
14 | #include <linux/pci.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/init.h> | |
17 | ||
18 | /* There is only *one* pci_eisa device per machine, right ? */ | |
19 | static struct eisa_root_device pci_eisa_root; | |
20 | ||
c5fb301a | 21 | static int __init pci_eisa_init(struct pci_dev *pdev) |
1da177e4 | 22 | { |
2cfda637 | 23 | struct resource *res, *bus_res = NULL; |
e34a6ba5 | 24 | int rc; |
1da177e4 LT |
25 | |
26 | if ((rc = pci_enable_device (pdev))) { | |
4cf9f24d | 27 | dev_err(&pdev->dev, "Could not enable device\n"); |
1da177e4 LT |
28 | return rc; |
29 | } | |
30 | ||
2cfda637 YL |
31 | /* |
32 | * The Intel 82375 PCI-EISA bridge is a subtractive-decode PCI | |
33 | * device, so the resources available on EISA are the same as those | |
34 | * available on the 82375 bus. This works the same as a PCI-PCI | |
35 | * bridge in subtractive-decode mode (see pci_read_bridge_bases()). | |
36 | * We assume other PCI-EISA bridges are similar. | |
37 | * | |
38 | * eisa_root_register() can only deal with a single io port resource, | |
39 | * so we use the first valid io port resource. | |
40 | */ | |
e34a6ba5 | 41 | pci_bus_for_each_resource(pdev->bus, res) |
2cfda637 YL |
42 | if (res && (res->flags & IORESOURCE_IO)) { |
43 | bus_res = res; | |
44 | break; | |
45 | } | |
46 | ||
47 | if (!bus_res) { | |
48 | dev_err(&pdev->dev, "No resources available\n"); | |
49 | return -1; | |
50 | } | |
51 | ||
91809d22 LM |
52 | pci_eisa_root.dev = &pdev->dev; |
53 | pci_eisa_root.res = bus_res; | |
54 | pci_eisa_root.bus_base_addr = bus_res->start; | |
55 | pci_eisa_root.slots = EISA_MAX_SLOTS; | |
56 | pci_eisa_root.dma_mask = pdev->dma_mask; | |
4b9d0d3b | 57 | dev_set_drvdata(pci_eisa_root.dev, &pci_eisa_root); |
1da177e4 LT |
58 | |
59 | if (eisa_root_register (&pci_eisa_root)) { | |
4cf9f24d | 60 | dev_err(&pdev->dev, "Could not register EISA root\n"); |
1da177e4 LT |
61 | return -1; |
62 | } | |
63 | ||
64 | return 0; | |
65 | } | |
66 | ||
c5fb301a YL |
67 | /* |
68 | * We have to call pci_eisa_init_early() before pnpacpi_init()/isapnp_init(). | |
69 | * Otherwise pnp resource will get enabled early and could prevent eisa | |
70 | * to be initialized. | |
71 | * Also need to make sure pci_eisa_init_early() is called after | |
72 | * x86/pci_subsys_init(). | |
73 | * So need to use subsys_initcall_sync with it. | |
74 | */ | |
75 | static int __init pci_eisa_init_early(void) | |
76 | { | |
77 | struct pci_dev *dev = NULL; | |
78 | int ret; | |
1da177e4 | 79 | |
c5fb301a YL |
80 | for_each_pci_dev(dev) |
81 | if ((dev->class >> 8) == PCI_CLASS_BRIDGE_EISA) { | |
82 | ret = pci_eisa_init(dev); | |
83 | if (ret) | |
84 | return ret; | |
85 | } | |
1da177e4 | 86 | |
c5fb301a | 87 | return 0; |
1da177e4 | 88 | } |
c5fb301a | 89 | subsys_initcall_sync(pci_eisa_init_early); |