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89 lines
2.3 KiB
89 lines
2.3 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Minimalist driver for a generic PCI-to-EISA bridge. |
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* |
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* (C) 2003 Marc Zyngier <[email protected]> |
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* |
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* Ivan Kokshaysky <[email protected]> : |
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* Generalisation from i82375 to PCI_CLASS_BRIDGE_EISA. |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/device.h> |
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#include <linux/eisa.h> |
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#include <linux/pci.h> |
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#include <linux/module.h> |
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#include <linux/init.h> |
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/* There is only *one* pci_eisa device per machine, right ? */ |
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static struct eisa_root_device pci_eisa_root; |
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static int __init pci_eisa_init(struct pci_dev *pdev) |
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{ |
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int rc, i; |
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struct resource *res, *bus_res = NULL; |
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if ((rc = pci_enable_device (pdev))) { |
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dev_err(&pdev->dev, "Could not enable device\n"); |
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return rc; |
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} |
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/* |
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* The Intel 82375 PCI-EISA bridge is a subtractive-decode PCI |
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* device, so the resources available on EISA are the same as those |
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* available on the 82375 bus. This works the same as a PCI-PCI |
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* bridge in subtractive-decode mode (see pci_read_bridge_bases()). |
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* We assume other PCI-EISA bridges are similar. |
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* |
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* eisa_root_register() can only deal with a single io port resource, |
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* so we use the first valid io port resource. |
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*/ |
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pci_bus_for_each_resource(pdev->bus, res, i) |
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if (res && (res->flags & IORESOURCE_IO)) { |
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bus_res = res; |
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break; |
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} |
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if (!bus_res) { |
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dev_err(&pdev->dev, "No resources available\n"); |
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return -1; |
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} |
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pci_eisa_root.dev = &pdev->dev; |
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pci_eisa_root.res = bus_res; |
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pci_eisa_root.bus_base_addr = bus_res->start; |
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pci_eisa_root.slots = EISA_MAX_SLOTS; |
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pci_eisa_root.dma_mask = pdev->dma_mask; |
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dev_set_drvdata(pci_eisa_root.dev, &pci_eisa_root); |
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if (eisa_root_register (&pci_eisa_root)) { |
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dev_err(&pdev->dev, "Could not register EISA root\n"); |
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return -1; |
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} |
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return 0; |
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} |
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/* |
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* We have to call pci_eisa_init_early() before pnpacpi_init()/isapnp_init(). |
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* Otherwise pnp resource will get enabled early and could prevent eisa |
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* to be initialized. |
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* Also need to make sure pci_eisa_init_early() is called after |
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* x86/pci_subsys_init(). |
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* So need to use subsys_initcall_sync with it. |
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*/ |
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static int __init pci_eisa_init_early(void) |
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{ |
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struct pci_dev *dev = NULL; |
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int ret; |
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for_each_pci_dev(dev) |
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if ((dev->class >> 8) == PCI_CLASS_BRIDGE_EISA) { |
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ret = pci_eisa_init(dev); |
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if (ret) |
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return ret; |
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} |
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return 0; |
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} |
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subsys_initcall_sync(pci_eisa_init_early);
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