forked from Minki/linux
93 lines
2.4 KiB
C
93 lines
2.4 KiB
C
|
/*
|
||
|
|
* Copyright (C) 2016 Broadcom
|
||
|
|
* Author: Jayachandran C <jchandra@broadcom.com>
|
||
|
|
* Copyright (C) 2016 Semihalf
|
||
|
|
* Author: Tomasz Nowicki <tn@semihalf.com>
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License, version 2, as
|
||
|
|
* published by the Free Software Foundation (the "GPL").
|
||
|
|
*
|
||
|
|
* This program is distributed in the hope that it will be useful, but
|
||
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||
|
|
* General Public License version 2 (GPLv2) for more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU General Public License
|
||
|
|
* version 2 (GPLv2) along with this source code.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#define pr_fmt(fmt) "ACPI: " fmt
|
||
|
|
|
||
|
|
#include <linux/kernel.h>
|
||
|
|
#include <linux/pci.h>
|
||
|
|
#include <linux/pci-acpi.h>
|
||
|
|
|
||
|
|
/* Structure to hold entries from the MCFG table */
|
||
|
|
struct mcfg_entry {
|
||
|
|
struct list_head list;
|
||
|
|
phys_addr_t addr;
|
||
|
|
u16 segment;
|
||
|
|
u8 bus_start;
|
||
|
|
u8 bus_end;
|
||
|
|
};
|
||
|
|
|
||
|
|
/* List to save MCFG entries */
|
||
|
|
static LIST_HEAD(pci_mcfg_list);
|
||
|
|
|
||
|
|
phys_addr_t pci_mcfg_lookup(u16 seg, struct resource *bus_res)
|
||
|
|
{
|
||
|
|
struct mcfg_entry *e;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* We expect exact match, unless MCFG entry end bus covers more than
|
||
|
|
* specified by caller.
|
||
|
|
*/
|
||
|
|
list_for_each_entry(e, &pci_mcfg_list, list) {
|
||
|
|
if (e->segment == seg && e->bus_start == bus_res->start &&
|
||
|
|
e->bus_end >= bus_res->end)
|
||
|
|
return e->addr;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static __init int pci_mcfg_parse(struct acpi_table_header *header)
|
||
|
|
{
|
||
|
|
struct acpi_table_mcfg *mcfg;
|
||
|
|
struct acpi_mcfg_allocation *mptr;
|
||
|
|
struct mcfg_entry *e, *arr;
|
||
|
|
int i, n;
|
||
|
|
|
||
|
|
if (header->length < sizeof(struct acpi_table_mcfg))
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
n = (header->length - sizeof(struct acpi_table_mcfg)) /
|
||
|
|
sizeof(struct acpi_mcfg_allocation);
|
||
|
|
mcfg = (struct acpi_table_mcfg *)header;
|
||
|
|
mptr = (struct acpi_mcfg_allocation *) &mcfg[1];
|
||
|
|
|
||
|
|
arr = kcalloc(n, sizeof(*arr), GFP_KERNEL);
|
||
|
|
if (!arr)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
for (i = 0, e = arr; i < n; i++, mptr++, e++) {
|
||
|
|
e->segment = mptr->pci_segment;
|
||
|
|
e->addr = mptr->address;
|
||
|
|
e->bus_start = mptr->start_bus_number;
|
||
|
|
e->bus_end = mptr->end_bus_number;
|
||
|
|
list_add(&e->list, &pci_mcfg_list);
|
||
|
|
}
|
||
|
|
|
||
|
|
pr_info("MCFG table detected, %d entries\n", n);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Interface called by ACPI - parse and save MCFG table */
|
||
|
|
void __init pci_mmcfg_late_init(void)
|
||
|
|
{
|
||
|
|
int err = acpi_table_parse(ACPI_SIG_MCFG, pci_mcfg_parse);
|
||
|
|
if (err)
|
||
|
|
pr_err("Failed to parse MCFG (%d)\n", err);
|
||
|
|
}
|