// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Read address ranges from a Broadcom CNB20LE Host Bridge
*
* Copyright ( c ) 2010 Ira W . Snyder < iws @ ovro . caltech . edu >
*/
#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 pci_root_res *root_res;
struct resource res;
u16 word1, word2;
u8 fbus, lbus;
/* read the PCI bus numbers */
fbus = read_pci_config_byte(bus, slot, func, 0 x44);
lbus = read_pci_config_byte(bus, slot, func, 0 x45);
info = alloc_pci_root_info(fbus, lbus, 0 , 0 );
/*
* 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, 0 x01f0, 0 x01f7, IORESOURCE_IO, 0 );
update_res(info, 0 x03f6, 0 x03f6, IORESOURCE_IO, 0 );
update_res(info, 0 x0170, 0 x0177, IORESOURCE_IO, 0 );
update_res(info, 0 x0376, 0 x0376, IORESOURCE_IO, 0 );
update_res(info, 0 xffa0, 0 xffaf, IORESOURCE_IO, 0 );
}
/* read the non-prefetchable memory window */
word1 = read_pci_config_16(bus, slot, func, 0 xc0);
word2 = read_pci_config_16(bus, slot, func, 0 xc2);
if (word1 != word2) {
res.start = ((resource_size_t) word1 << 16 ) | 0 x0000;
res.end = ((resource_size_t) word2 << 16 ) | 0 xffff;
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, 0 xc4);
word2 = read_pci_config_16(bus, slot, func, 0 xc6);
if (word1 != word2) {
res.start = ((resource_size_t) word1 << 16 ) | 0 x0000;
res.end = ((resource_size_t) word2 << 16 ) | 0 xffff;
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, 0 xd0);
word2 = read_pci_config_16(bus, slot, func, 0 xd2);
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);
list_for_each_entry(root_res, &info->resources, list)
printk(KERN_INFO "host bridge window %pR\n" , &root_res->res);
}
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_disabled && acpi_os_get_root_pointer())
return 0 ;
#endif
id = read_pci_config(bus, slot, 0 , PCI_VENDOR_ID);
vendor = id & 0 xffff;
device = (id >> 16 ) & 0 xffff;
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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(vorverarbeitet am 2026-10-01)
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