662 lines
15 KiB
C
662 lines
15 KiB
C
/*
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* CompactPCI Hot Plug Driver PCI functions
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*
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* Copyright (C) 2002 by SOMA Networks, Inc.
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Send feedback to <scottm@somanetworks.com>
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include <linux/proc_fs.h>
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#include "../pci.h"
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#include "pci_hotplug.h"
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#include "cpci_hotplug.h"
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#if !defined(MODULE)
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#define MY_NAME "cpci_hotplug"
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#else
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#define MY_NAME THIS_MODULE->name
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#endif
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extern int cpci_debug;
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#define dbg(format, arg...) \
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do { \
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if(cpci_debug) \
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printk (KERN_DEBUG "%s: " format "\n", \
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MY_NAME , ## arg); \
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} while(0)
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#define err(format, arg...) printk(KERN_ERR "%s: " format "\n", MY_NAME , ## arg)
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#define info(format, arg...) printk(KERN_INFO "%s: " format "\n", MY_NAME , ## arg)
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#define warn(format, arg...) printk(KERN_WARNING "%s: " format "\n", MY_NAME , ## arg)
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#define ROUND_UP(x, a) (((x) + (a) - 1) & ~((a) - 1))
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u8 cpci_get_attention_status(struct slot* slot)
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{
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int hs_cap;
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u16 hs_csr;
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hs_cap = pci_bus_find_capability(slot->bus,
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slot->devfn,
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PCI_CAP_ID_CHSWP);
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if(!hs_cap) {
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return 0;
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}
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if(pci_bus_read_config_word(slot->bus,
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slot->devfn,
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hs_cap + 2,
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&hs_csr)) {
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return 0;
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}
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return hs_csr & 0x0008 ? 1 : 0;
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}
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int cpci_set_attention_status(struct slot* slot, int status)
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{
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int hs_cap;
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u16 hs_csr;
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hs_cap = pci_bus_find_capability(slot->bus,
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slot->devfn,
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PCI_CAP_ID_CHSWP);
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if(!hs_cap) {
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return 0;
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}
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if(pci_bus_read_config_word(slot->bus,
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slot->devfn,
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hs_cap + 2,
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&hs_csr)) {
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return 0;
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}
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if(status) {
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hs_csr |= HS_CSR_LOO;
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} else {
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hs_csr &= ~HS_CSR_LOO;
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}
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if(pci_bus_write_config_word(slot->bus,
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slot->devfn,
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hs_cap + 2,
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hs_csr)) {
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return 0;
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}
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return 1;
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}
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u16 cpci_get_hs_csr(struct slot* slot)
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{
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int hs_cap;
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u16 hs_csr;
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hs_cap = pci_bus_find_capability(slot->bus,
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slot->devfn,
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PCI_CAP_ID_CHSWP);
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if(!hs_cap) {
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return 0xFFFF;
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}
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if(pci_bus_read_config_word(slot->bus,
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slot->devfn,
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hs_cap + 2,
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&hs_csr)) {
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return 0xFFFF;
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}
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return hs_csr;
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}
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#if 0
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u16 cpci_set_hs_csr(struct slot* slot, u16 hs_csr)
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{
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int hs_cap;
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u16 new_hs_csr;
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hs_cap = pci_bus_find_capability(slot->bus,
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slot->devfn,
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PCI_CAP_ID_CHSWP);
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if(!hs_cap) {
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return 0xFFFF;
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}
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/* Write out the new value */
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if(pci_bus_write_config_word(slot->bus,
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slot->devfn,
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hs_cap + 2,
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hs_csr)) {
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return 0xFFFF;
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}
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/* Read back what we just wrote out */
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if(pci_bus_read_config_word(slot->bus,
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slot->devfn,
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hs_cap + 2,
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&new_hs_csr)) {
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return 0xFFFF;
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}
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return new_hs_csr;
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}
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#endif
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int cpci_check_and_clear_ins(struct slot* slot)
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{
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int hs_cap;
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u16 hs_csr;
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int ins = 0;
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hs_cap = pci_bus_find_capability(slot->bus,
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slot->devfn,
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PCI_CAP_ID_CHSWP);
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if(!hs_cap) {
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return 0;
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}
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if(pci_bus_read_config_word(slot->bus,
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slot->devfn,
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hs_cap + 2,
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&hs_csr)) {
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return 0;
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}
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if(hs_csr & HS_CSR_INS) {
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/* Clear INS (by setting it) */
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if(pci_bus_write_config_word(slot->bus,
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slot->devfn,
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hs_cap + 2,
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hs_csr)) {
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ins = 0;
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}
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ins = 1;
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}
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return ins;
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}
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int cpci_check_ext(struct slot* slot)
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{
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int hs_cap;
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u16 hs_csr;
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int ext = 0;
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hs_cap = pci_bus_find_capability(slot->bus,
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slot->devfn,
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PCI_CAP_ID_CHSWP);
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if(!hs_cap) {
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return 0;
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}
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if(pci_bus_read_config_word(slot->bus,
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slot->devfn,
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hs_cap + 2,
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&hs_csr)) {
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return 0;
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}
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if(hs_csr & HS_CSR_EXT) {
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ext = 1;
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}
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return ext;
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}
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int cpci_clear_ext(struct slot* slot)
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{
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int hs_cap;
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u16 hs_csr;
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hs_cap = pci_bus_find_capability(slot->bus,
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slot->devfn,
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PCI_CAP_ID_CHSWP);
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if(!hs_cap) {
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return -ENODEV;
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}
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if(pci_bus_read_config_word(slot->bus,
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slot->devfn,
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hs_cap + 2,
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&hs_csr)) {
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return -ENODEV;
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}
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if(hs_csr & HS_CSR_EXT) {
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/* Clear EXT (by setting it) */
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if(pci_bus_write_config_word(slot->bus,
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slot->devfn,
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hs_cap + 2,
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hs_csr)) {
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return -ENODEV;
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}
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}
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return 0;
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}
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int cpci_led_on(struct slot* slot)
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{
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int hs_cap;
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u16 hs_csr;
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hs_cap = pci_bus_find_capability(slot->bus,
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slot->devfn,
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PCI_CAP_ID_CHSWP);
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if(!hs_cap) {
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return -ENODEV;
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}
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if(pci_bus_read_config_word(slot->bus,
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slot->devfn,
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hs_cap + 2,
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&hs_csr)) {
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return -ENODEV;
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}
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if((hs_csr & HS_CSR_LOO) != HS_CSR_LOO) {
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/* Set LOO */
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hs_csr |= HS_CSR_LOO;
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if(pci_bus_write_config_word(slot->bus,
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slot->devfn,
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hs_cap + 2,
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hs_csr)) {
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err("Could not set LOO for slot %s",
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slot->hotplug_slot->name);
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return -ENODEV;
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}
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}
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return 0;
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}
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int cpci_led_off(struct slot* slot)
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{
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int hs_cap;
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u16 hs_csr;
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hs_cap = pci_bus_find_capability(slot->bus,
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slot->devfn,
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PCI_CAP_ID_CHSWP);
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if(!hs_cap) {
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return -ENODEV;
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}
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if(pci_bus_read_config_word(slot->bus,
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slot->devfn,
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hs_cap + 2,
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&hs_csr)) {
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return -ENODEV;
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}
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if(hs_csr & HS_CSR_LOO) {
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/* Clear LOO */
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hs_csr &= ~HS_CSR_LOO;
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if(pci_bus_write_config_word(slot->bus,
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slot->devfn,
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hs_cap + 2,
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hs_csr)) {
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err("Could not clear LOO for slot %s",
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slot->hotplug_slot->name);
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return -ENODEV;
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}
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}
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return 0;
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}
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/*
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* Device configuration functions
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*/
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static int cpci_configure_dev(struct pci_bus *bus, struct pci_dev *dev)
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{
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u8 irq_pin;
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int r;
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dbg("%s - enter", __FUNCTION__);
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/* NOTE: device already setup from prior scan */
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/* FIXME: How would we know if we need to enable the expansion ROM? */
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pci_write_config_word(dev, PCI_ROM_ADDRESS, 0x00L);
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/* Assign resources */
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dbg("assigning resources for %02x:%02x.%x",
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dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
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for (r = 0; r < 6; r++) {
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struct resource *res = dev->resource + r;
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if(res->flags)
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pci_assign_resource(dev, r);
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}
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dbg("finished assigning resources for %02x:%02x.%x",
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dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
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/* Does this function have an interrupt at all? */
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dbg("checking for function interrupt");
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pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq_pin);
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if(irq_pin) {
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dbg("function uses interrupt pin %d", irq_pin);
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}
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/*
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* Need to explicitly set irq field to 0 so that it'll get assigned
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* by the pcibios platform dependent code called by pci_enable_device.
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*/
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dev->irq = 0;
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dbg("enabling device");
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pci_enable_device(dev); /* XXX check return */
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dbg("now dev->irq = %d", dev->irq);
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if(irq_pin && dev->irq) {
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pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
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}
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/* Can't use pci_insert_device at the moment, do it manually for now */
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pci_proc_attach_device(dev);
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dbg("notifying drivers");
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//pci_announce_device_to_drivers(dev);
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dbg("%s - exit", __FUNCTION__);
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return 0;
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}
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static int cpci_configure_bridge(struct pci_bus* bus, struct pci_dev* dev)
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{
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int rc;
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struct pci_bus* child;
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struct resource* r;
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u8 max, n;
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u16 command;
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dbg("%s - enter", __FUNCTION__);
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/* Do basic bridge initialization */
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rc = pci_write_config_byte(dev, PCI_LATENCY_TIMER, 0x40);
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if(rc) {
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printk(KERN_ERR "%s - write of PCI_LATENCY_TIMER failed\n", __FUNCTION__);
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}
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rc = pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER, 0x40);
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if(rc) {
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printk(KERN_ERR "%s - write of PCI_SEC_LATENCY_TIMER failed\n", __FUNCTION__);
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}
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rc = pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, L1_CACHE_BYTES / 4);
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if(rc) {
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printk(KERN_ERR "%s - write of PCI_CACHE_LINE_SIZE failed\n", __FUNCTION__);
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}
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/*
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* Set parent bridge's subordinate field so that configuration space
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* access will work in pci_scan_bridge and friends.
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*/
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max = pci_max_busnr();
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bus->subordinate = max + 1;
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pci_write_config_byte(bus->self, PCI_SUBORDINATE_BUS, max + 1);
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/* Scan behind bridge */
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n = pci_scan_bridge(bus, dev, max, 2);
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child = pci_find_bus(0, max + 1);
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if (!child)
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return -ENODEV;
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pci_proc_attach_bus(child);
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/*
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* Update parent bridge's subordinate field if there were more bridges
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* behind the bridge that was scanned.
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*/
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if(n > max) {
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bus->subordinate = n;
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pci_write_config_byte(bus->self, PCI_SUBORDINATE_BUS, n);
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}
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/*
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* Update the bridge resources of the bridge to accommodate devices
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* behind it.
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*/
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pci_bus_size_bridges(child);
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pci_bus_assign_resources(child);
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/* Enable resource mapping via command register */
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command = PCI_COMMAND_MASTER | PCI_COMMAND_INVALIDATE | PCI_COMMAND_PARITY | PCI_COMMAND_SERR;
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r = child->resource[0];
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if(r && r->start) {
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command |= PCI_COMMAND_IO;
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}
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r = child->resource[1];
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if(r && r->start) {
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command |= PCI_COMMAND_MEMORY;
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}
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r = child->resource[2];
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if(r && r->start) {
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command |= PCI_COMMAND_MEMORY;
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}
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rc = pci_write_config_word(dev, PCI_COMMAND, command);
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if(rc) {
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err("Error setting command register");
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return rc;
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}
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/* Set bridge control register */
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command = PCI_BRIDGE_CTL_PARITY | PCI_BRIDGE_CTL_SERR | PCI_BRIDGE_CTL_NO_ISA;
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rc = pci_write_config_word(dev, PCI_BRIDGE_CONTROL, command);
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if(rc) {
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err("Error setting bridge control register");
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return rc;
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}
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dbg("%s - exit", __FUNCTION__);
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return 0;
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}
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static int configure_visit_pci_dev(struct pci_dev_wrapped *wrapped_dev,
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struct pci_bus_wrapped *wrapped_bus)
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{
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int rc;
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struct pci_dev *dev = wrapped_dev->dev;
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struct pci_bus *bus = wrapped_bus->bus;
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struct slot* slot;
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dbg("%s - enter", __FUNCTION__);
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/*
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* We need to fix up the hotplug representation with the Linux
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* representation.
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*/
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if(wrapped_dev->data) {
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slot = (struct slot*) wrapped_dev->data;
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slot->dev = dev;
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}
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/* If it's a bridge, scan behind it for devices */
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if(dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
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rc = cpci_configure_bridge(bus, dev);
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if(rc)
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return rc;
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}
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/* Actually configure device */
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if(dev) {
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rc = cpci_configure_dev(bus, dev);
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if(rc)
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return rc;
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}
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dbg("%s - exit", __FUNCTION__);
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return 0;
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}
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static int unconfigure_visit_pci_dev_phase2(struct pci_dev_wrapped *wrapped_dev,
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struct pci_bus_wrapped *wrapped_bus)
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{
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struct pci_dev *dev = wrapped_dev->dev;
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struct slot* slot;
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dbg("%s - enter", __FUNCTION__);
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if(!dev)
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return -ENODEV;
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/* Remove the Linux representation */
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if(pci_remove_device_safe(dev)) {
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err("Could not remove device\n");
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return -1;
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}
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/*
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* Now remove the hotplug representation.
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*/
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if(wrapped_dev->data) {
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slot = (struct slot*) wrapped_dev->data;
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slot->dev = NULL;
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} else {
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dbg("No hotplug representation for %02x:%02x.%x",
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dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
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}
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dbg("%s - exit", __FUNCTION__);
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return 0;
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}
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static int unconfigure_visit_pci_bus_phase2(struct pci_bus_wrapped *wrapped_bus,
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struct pci_dev_wrapped *wrapped_dev)
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{
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struct pci_bus *bus = wrapped_bus->bus;
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struct pci_bus *parent = bus->self->bus;
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dbg("%s - enter", __FUNCTION__);
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/* The cleanup code for proc entries regarding buses should be in the kernel... */
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if(bus->procdir)
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dbg("detach_pci_bus %s", bus->procdir->name);
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pci_proc_detach_bus(bus);
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/* The cleanup code should live in the kernel... */
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bus->self->subordinate = NULL;
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/* unlink from parent bus */
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list_del(&bus->node);
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/* Now, remove */
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if(bus)
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kfree(bus);
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/* Update parent's subordinate field */
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if(parent) {
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u8 n = pci_bus_max_busnr(parent);
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if(n < parent->subordinate) {
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parent->subordinate = n;
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pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS, n);
|
|
}
|
|
}
|
|
dbg("%s - exit", __FUNCTION__);
|
|
return 0;
|
|
}
|
|
|
|
static struct pci_visit configure_functions = {
|
|
.visit_pci_dev = configure_visit_pci_dev,
|
|
};
|
|
|
|
static struct pci_visit unconfigure_functions_phase2 = {
|
|
.post_visit_pci_bus = unconfigure_visit_pci_bus_phase2,
|
|
.post_visit_pci_dev = unconfigure_visit_pci_dev_phase2
|
|
};
|
|
|
|
|
|
int cpci_configure_slot(struct slot* slot)
|
|
{
|
|
int rc = 0;
|
|
|
|
dbg("%s - enter", __FUNCTION__);
|
|
|
|
if(slot->dev == NULL) {
|
|
dbg("pci_dev null, finding %02x:%02x:%x",
|
|
slot->bus->number, PCI_SLOT(slot->devfn), PCI_FUNC(slot->devfn));
|
|
slot->dev = pci_find_slot(slot->bus->number, slot->devfn);
|
|
}
|
|
|
|
/* Still NULL? Well then scan for it! */
|
|
if(slot->dev == NULL) {
|
|
int n;
|
|
dbg("pci_dev still null");
|
|
|
|
/*
|
|
* This will generate pci_dev structures for all functions, but
|
|
* we will only call this case when lookup fails.
|
|
*/
|
|
n = pci_scan_slot(slot->bus, slot->devfn);
|
|
dbg("%s: pci_scan_slot returned %d", __FUNCTION__, n);
|
|
if(n > 0)
|
|
pci_bus_add_devices(slot->bus);
|
|
slot->dev = pci_find_slot(slot->bus->number, slot->devfn);
|
|
if(slot->dev == NULL) {
|
|
err("Could not find PCI device for slot %02x", slot->number);
|
|
return 0;
|
|
}
|
|
}
|
|
dbg("slot->dev = %p", slot->dev);
|
|
if(slot->dev) {
|
|
struct pci_dev *dev;
|
|
struct pci_dev_wrapped wrapped_dev;
|
|
struct pci_bus_wrapped wrapped_bus;
|
|
int i;
|
|
|
|
memset(&wrapped_dev, 0, sizeof (struct pci_dev_wrapped));
|
|
memset(&wrapped_bus, 0, sizeof (struct pci_bus_wrapped));
|
|
|
|
for (i = 0; i < 8; i++) {
|
|
dev = pci_find_slot(slot->bus->number,
|
|
PCI_DEVFN(PCI_SLOT(slot->dev->devfn), i));
|
|
if(!dev)
|
|
continue;
|
|
wrapped_dev.dev = dev;
|
|
wrapped_bus.bus = slot->dev->bus;
|
|
if(i)
|
|
wrapped_dev.data = NULL;
|
|
else
|
|
wrapped_dev.data = (void*) slot;
|
|
rc = pci_visit_dev(&configure_functions, &wrapped_dev, &wrapped_bus);
|
|
}
|
|
}
|
|
|
|
dbg("%s - exit, rc = %d", __FUNCTION__, rc);
|
|
return rc;
|
|
}
|
|
|
|
int cpci_unconfigure_slot(struct slot* slot)
|
|
{
|
|
int rc = 0;
|
|
int i;
|
|
struct pci_dev_wrapped wrapped_dev;
|
|
struct pci_bus_wrapped wrapped_bus;
|
|
struct pci_dev *dev;
|
|
|
|
dbg("%s - enter", __FUNCTION__);
|
|
|
|
if(!slot->dev) {
|
|
err("No device for slot %02x\n", slot->number);
|
|
return -ENODEV;
|
|
}
|
|
|
|
memset(&wrapped_dev, 0, sizeof (struct pci_dev_wrapped));
|
|
memset(&wrapped_bus, 0, sizeof (struct pci_bus_wrapped));
|
|
|
|
for (i = 0; i < 8; i++) {
|
|
dev = pci_find_slot(slot->bus->number,
|
|
PCI_DEVFN(PCI_SLOT(slot->devfn), i));
|
|
if(dev) {
|
|
wrapped_dev.dev = dev;
|
|
wrapped_bus.bus = dev->bus;
|
|
if(i)
|
|
wrapped_dev.data = NULL;
|
|
else
|
|
wrapped_dev.data = (void*) slot;
|
|
dbg("%s - unconfigure phase 2", __FUNCTION__);
|
|
rc = pci_visit_dev(&unconfigure_functions_phase2,
|
|
&wrapped_dev,
|
|
&wrapped_bus);
|
|
if(rc)
|
|
break;
|
|
}
|
|
}
|
|
dbg("%s - exit, rc = %d", __FUNCTION__, rc);
|
|
return rc;
|
|
}
|