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/*
* Read address ranges from a Broadcom CNB20LE Host Bridge
*
* Copyright (c) 2010 Ira W. Snyder <iws@ovro.caltech.edu>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#include <linux/acpi.h>
#include <linux/delay.h>
#include <linux/dmi.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <asm/pci_x86.h>
#include <asm/pci-direct.h>
#include "bus_numa.h"
static void __init cnb20le_res(u8 bus, u8 slot, u8 func)
{
struct pci_root_info *info;
struct resource res;
u16 word1, word2;
u8 fbus, lbus;
int i;
info = &pci_root_info[pci_root_num];
pci_root_num++;
/* read the PCI bus numbers */
fbus = read_pci_config_byte(bus, slot, func, 0x44);
lbus = read_pci_config_byte(bus, slot, func, 0x45);
info->bus_min = fbus;
info->bus_max = lbus;
/*
* Add the legacy IDE ports on bus 0
*
* These do not exist anywhere in the bridge registers, AFAICT. I do
* not have the datasheet, so this is the best I can do.
*/
if (fbus == 0) {
update_res(info, 0x01f0, 0x01f7, IORESOURCE_IO, 0);
update_res(info, 0x03f6, 0x03f6, IORESOURCE_IO, 0);
update_res(info, 0x0170, 0x0177, IORESOURCE_IO, 0);
update_res(info, 0x0376, 0x0376, IORESOURCE_IO, 0);
update_res(info, 0xffa0, 0xffaf, IORESOURCE_IO, 0);
}
/* read the non-prefetchable memory window */
word1 = read_pci_config_16(bus, slot, func, 0xc0);
word2 = read_pci_config_16(bus, slot, func, 0xc2);
if (word1 != word2) {
res.start = (word1 << 16) | 0x0000;
res.end = (word2 << 16) | 0xffff;
res.flags = IORESOURCE_MEM;
update_res(info, res.start, res.end, res.flags, 0);
}
/* read the prefetchable memory window */
word1 = read_pci_config_16(bus, slot, func, 0xc4);
word2 = read_pci_config_16(bus, slot, func, 0xc6);
if (word1 != word2) {
res.start = (word1 << 16) | 0x0000;
res.end = (word2 << 16) | 0xffff;
res.flags = IORESOURCE_MEM | IORESOURCE_PREFETCH;
update_res(info, res.start, res.end, res.flags, 0);
}
/* read the IO port window */
word1 = read_pci_config_16(bus, slot, func, 0xd0);
word2 = read_pci_config_16(bus, slot, func, 0xd2);
if (word1 != word2) {
res.start = word1;
res.end = word2;
res.flags = IORESOURCE_IO;
update_res(info, res.start, res.end, res.flags, 0);
}
/* print information about this host bridge */
res.start = fbus;
res.end = lbus;
res.flags = IORESOURCE_BUS;
printk(KERN_INFO "CNB20LE PCI Host Bridge (domain 0000 %pR)\n", &res);
for (i = 0; i < info->res_num; i++)
printk(KERN_INFO "host bridge window %pR\n", &info->res[i]);
}
static int __init broadcom_postcore_init(void)
{
u8 bus = 0, slot = 0;
u32 id;
u16 vendor, device;
#ifdef CONFIG_ACPI
/*
* We should get host bridge information from ACPI unless the BIOS
* doesn't support it.
*/
if (acpi_os_get_root_pointer())
return 0;
#endif
id = read_pci_config(bus, slot, 0, PCI_VENDOR_ID);
vendor = id & 0xffff;
device = (id >> 16) & 0xffff;
if (vendor == PCI_VENDOR_ID_SERVERWORKS &&
device == PCI_DEVICE_ID_SERVERWORKS_LE) {
cnb20le_res(bus, slot, 0);
cnb20le_res(bus, slot, 1);
}
return 0;
}
postcore_initcall(broadcom_postcore_init);
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