105 lines
2.8 KiB
C
105 lines
2.8 KiB
C
/*
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* Read address ranges from a Broadcom CNB20LE Host Bridge
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*
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* Copyright (c) 2010 Ira W. Snyder <iws@ovro.caltech.edu>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/acpi.h>
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#include <linux/delay.h>
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#include <linux/dmi.h>
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#include <linux/pci.h>
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#include <linux/init.h>
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#include <asm/pci_x86.h>
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#include "bus_numa.h"
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static void __devinit cnb20le_res(struct pci_dev *dev)
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{
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struct pci_root_info *info;
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struct resource res;
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u16 word1, word2;
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u8 fbus, lbus;
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int i;
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#ifdef CONFIG_ACPI
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/*
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* We should get host bridge information from ACPI unless the BIOS
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* doesn't support it.
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*/
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if (acpi_os_get_root_pointer())
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return;
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#endif
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info = &pci_root_info[pci_root_num];
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pci_root_num++;
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/* read the PCI bus numbers */
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pci_read_config_byte(dev, 0x44, &fbus);
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pci_read_config_byte(dev, 0x45, &lbus);
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info->bus_min = fbus;
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info->bus_max = lbus;
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/*
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* Add the legacy IDE ports on bus 0
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*
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* These do not exist anywhere in the bridge registers, AFAICT. I do
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* not have the datasheet, so this is the best I can do.
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*/
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if (fbus == 0) {
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update_res(info, 0x01f0, 0x01f7, IORESOURCE_IO, 0);
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update_res(info, 0x03f6, 0x03f6, IORESOURCE_IO, 0);
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update_res(info, 0x0170, 0x0177, IORESOURCE_IO, 0);
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update_res(info, 0x0376, 0x0376, IORESOURCE_IO, 0);
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update_res(info, 0xffa0, 0xffaf, IORESOURCE_IO, 0);
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}
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/* read the non-prefetchable memory window */
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pci_read_config_word(dev, 0xc0, &word1);
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pci_read_config_word(dev, 0xc2, &word2);
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if (word1 != word2) {
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res.start = (word1 << 16) | 0x0000;
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res.end = (word2 << 16) | 0xffff;
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res.flags = IORESOURCE_MEM;
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update_res(info, res.start, res.end, res.flags, 0);
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}
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/* read the prefetchable memory window */
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pci_read_config_word(dev, 0xc4, &word1);
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pci_read_config_word(dev, 0xc6, &word2);
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if (word1 != word2) {
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res.start = (word1 << 16) | 0x0000;
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res.end = (word2 << 16) | 0xffff;
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res.flags = IORESOURCE_MEM | IORESOURCE_PREFETCH;
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update_res(info, res.start, res.end, res.flags, 0);
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}
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/* read the IO port window */
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pci_read_config_word(dev, 0xd0, &word1);
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pci_read_config_word(dev, 0xd2, &word2);
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if (word1 != word2) {
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res.start = word1;
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res.end = word2;
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res.flags = IORESOURCE_IO;
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update_res(info, res.start, res.end, res.flags, 0);
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}
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/* print information about this host bridge */
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res.start = fbus;
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res.end = lbus;
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res.flags = IORESOURCE_BUS;
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dev_info(&dev->dev, "CNB20LE PCI Host Bridge (domain %04x %pR)\n",
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pci_domain_nr(dev->bus), &res);
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for (i = 0; i < info->res_num; i++)
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dev_info(&dev->dev, "host bridge window %pR\n", &info->res[i]);
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}
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DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_LE,
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cnb20le_res);
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