LXR linux/arch/x86/pci/broadcom

   1/*
   2 * Read address ranges from a Broadcom CNB20LE Host Bridge
   3 *
   4 * Copyright (c) 2010 Ira W. Snyder <iws@ovro.caltech.edu>
   5 *
   6 * This program is free software; you can redistribute it and/or modify it
   7 * under the terms of the GNU General Public License as published by the
   8 * Free Software Foundation; either version 2 of the License, or (at your
   9 * option) any later version.
  10 */
  11
  12#include <linux/acpi.h>
  13#include <linux/delay.h>
  14#include <linux/dmi.h>
  15#include <linux/pci.h>
  16#include <linux/init.h>
  17#include <asm/pci_x86.h>
  18#include <asm/pci-direct.h>
  19
  20#include "bus_numa.h"
  21
  22static void __init cnb20le_res(u8 bus, u8 slot, u8 func)
  23{
  24        struct pci_root_info *info;
  25        struct pci_root_res *root_res;
  26        struct resource res;
  27        u16 word1, word2;
  28        u8 fbus, lbus;
  29
  30        /* read the PCI bus numbers */
  31        fbus = read_pci_config_byte(bus, slot, func, 0x44);
  32        lbus = read_pci_config_byte(bus, slot, func, 0x45);
  33        info = alloc_pci_root_info(fbus, lbus, 0, 0);
  34
  35        /*
  36         * Add the legacy IDE ports on bus 0
  37         *
  38         * These do not exist anywhere in the bridge registers, AFAICT. I do
  39         * not have the datasheet, so this is the best I can do.
  40         */
  41        if (fbus == 0) {
  42                update_res(info, 0x01f0, 0x01f7, IORESOURCE_IO, 0);
  43                update_res(info, 0x03f6, 0x03f6, IORESOURCE_IO, 0);
  44                update_res(info, 0x0170, 0x0177, IORESOURCE_IO, 0);
  45                update_res(info, 0x0376, 0x0376, IORESOURCE_IO, 0);
  46                update_res(info, 0xffa0, 0xffaf, IORESOURCE_IO, 0);
  47        }
  48
  49        /* read the non-prefetchable memory window */
  50        word1 = read_pci_config_16(bus, slot, func, 0xc0);
  51        word2 = read_pci_config_16(bus, slot, func, 0xc2);
  52        if (word1 != word2) {
  53                res.start = (word1 << 16) | 0x0000;
  54                res.end   = (word2 << 16) | 0xffff;
  55                res.flags = IORESOURCE_MEM;
  56                update_res(info, res.start, res.end, res.flags, 0);
  57        }
  58
  59        /* read the prefetchable memory window */
  60        word1 = read_pci_config_16(bus, slot, func, 0xc4);
  61        word2 = read_pci_config_16(bus, slot, func, 0xc6);
  62        if (word1 != word2) {
  63                res.start = (word1 << 16) | 0x0000;
  64                res.end   = (word2 << 16) | 0xffff;
  65                res.flags = IORESOURCE_MEM | IORESOURCE_PREFETCH;
  66                update_res(info, res.start, res.end, res.flags, 0);
  67        }
  68
  69        /* read the IO port window */
  70        word1 = read_pci_config_16(bus, slot, func, 0xd0);
  71        word2 = read_pci_config_16(bus, slot, func, 0xd2);
  72        if (word1 != word2) {
  73                res.start = word1;
  74                res.end   = word2;
  75                res.flags = IORESOURCE_IO;
  76                update_res(info, res.start, res.end, res.flags, 0);
  77        }
  78
  79        /* print information about this host bridge */
  80        res.start = fbus;
  81        res.end   = lbus;
  82        res.flags = IORESOURCE_BUS;
  83        printk(KERN_INFO "CNB20LE PCI Host Bridge (domain 0000 %pR)\n", &res);
  84
  85        list_for_each_entry(root_res, &info->resources, list)
  86                printk(KERN_INFO "host bridge window %pR\n", &root_res->res);
  87}
  88
  89static int __init broadcom_postcore_init(void)
  90{
  91        u8 bus = 0, slot = 0;
  92        u32 id;
  93        u16 vendor, device;
  94
  95#ifdef CONFIG_ACPI
  96        /*
  97         * We should get host bridge information from ACPI unless the BIOS
  98         * doesn't support it.
  99         */
 100        if (acpi_os_get_root_pointer())
 101                return 0;
 102#endif
 103
 104        id = read_pci_config(bus, slot, 0, PCI_VENDOR_ID);
 105        vendor = id & 0xffff;
 106        device = (id >> 16) & 0xffff;
 107
 108        if (vendor == PCI_VENDOR_ID_SERVERWORKS &&
 109            device == PCI_DEVICE_ID_SERVERWORKS_LE) {
 110                cnb20le_res(bus, slot, 0);
 111                cnb20le_res(bus, slot, 1);
 112        }
 113        return 0;
 114}
 115
 116postcore_initcall(broadcom_postcore_init);
 117