mirror of https://gitee.com/openkylin/linux.git
354 lines
7.6 KiB
C
354 lines
7.6 KiB
C
/*
|
|
* CompactPCI Hot Plug Driver PCI functions
|
|
*
|
|
* Copyright (C) 2002,2005 by SOMA Networks, Inc.
|
|
*
|
|
* All rights reserved.
|
|
*
|
|
* 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.
|
|
*
|
|
* 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, GOOD TITLE or
|
|
* NON INFRINGEMENT. See the GNU General Public License for more
|
|
* details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*
|
|
* Send feedback to <scottm@somanetworks.com>
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/pci_hotplug.h>
|
|
#include <linux/proc_fs.h>
|
|
#include "../pci.h"
|
|
#include "cpci_hotplug.h"
|
|
|
|
#define MY_NAME "cpci_hotplug"
|
|
|
|
extern int cpci_debug;
|
|
|
|
#define dbg(format, arg...) \
|
|
do { \
|
|
if (cpci_debug) \
|
|
printk (KERN_DEBUG "%s: " format "\n", \
|
|
MY_NAME , ## arg); \
|
|
} while (0)
|
|
#define err(format, arg...) printk(KERN_ERR "%s: " format "\n", MY_NAME , ## arg)
|
|
#define info(format, arg...) printk(KERN_INFO "%s: " format "\n", MY_NAME , ## arg)
|
|
#define warn(format, arg...) printk(KERN_WARNING "%s: " format "\n", MY_NAME , ## arg)
|
|
|
|
|
|
u8 cpci_get_attention_status(struct slot* slot)
|
|
{
|
|
int hs_cap;
|
|
u16 hs_csr;
|
|
|
|
hs_cap = pci_bus_find_capability(slot->bus,
|
|
slot->devfn,
|
|
PCI_CAP_ID_CHSWP);
|
|
if (!hs_cap)
|
|
return 0;
|
|
|
|
if (pci_bus_read_config_word(slot->bus,
|
|
slot->devfn,
|
|
hs_cap + 2,
|
|
&hs_csr))
|
|
return 0;
|
|
|
|
return hs_csr & 0x0008 ? 1 : 0;
|
|
}
|
|
|
|
int cpci_set_attention_status(struct slot* slot, int status)
|
|
{
|
|
int hs_cap;
|
|
u16 hs_csr;
|
|
|
|
hs_cap = pci_bus_find_capability(slot->bus,
|
|
slot->devfn,
|
|
PCI_CAP_ID_CHSWP);
|
|
if (!hs_cap)
|
|
return 0;
|
|
if (pci_bus_read_config_word(slot->bus,
|
|
slot->devfn,
|
|
hs_cap + 2,
|
|
&hs_csr))
|
|
return 0;
|
|
if (status)
|
|
hs_csr |= HS_CSR_LOO;
|
|
else
|
|
hs_csr &= ~HS_CSR_LOO;
|
|
if (pci_bus_write_config_word(slot->bus,
|
|
slot->devfn,
|
|
hs_cap + 2,
|
|
hs_csr))
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
u16 cpci_get_hs_csr(struct slot* slot)
|
|
{
|
|
int hs_cap;
|
|
u16 hs_csr;
|
|
|
|
hs_cap = pci_bus_find_capability(slot->bus,
|
|
slot->devfn,
|
|
PCI_CAP_ID_CHSWP);
|
|
if (!hs_cap)
|
|
return 0xFFFF;
|
|
if (pci_bus_read_config_word(slot->bus,
|
|
slot->devfn,
|
|
hs_cap + 2,
|
|
&hs_csr))
|
|
return 0xFFFF;
|
|
return hs_csr;
|
|
}
|
|
|
|
int cpci_check_and_clear_ins(struct slot* slot)
|
|
{
|
|
int hs_cap;
|
|
u16 hs_csr;
|
|
int ins = 0;
|
|
|
|
hs_cap = pci_bus_find_capability(slot->bus,
|
|
slot->devfn,
|
|
PCI_CAP_ID_CHSWP);
|
|
if (!hs_cap)
|
|
return 0;
|
|
if (pci_bus_read_config_word(slot->bus,
|
|
slot->devfn,
|
|
hs_cap + 2,
|
|
&hs_csr))
|
|
return 0;
|
|
if (hs_csr & HS_CSR_INS) {
|
|
/* Clear INS (by setting it) */
|
|
if (pci_bus_write_config_word(slot->bus,
|
|
slot->devfn,
|
|
hs_cap + 2,
|
|
hs_csr))
|
|
ins = 0;
|
|
else
|
|
ins = 1;
|
|
}
|
|
return ins;
|
|
}
|
|
|
|
int cpci_check_ext(struct slot* slot)
|
|
{
|
|
int hs_cap;
|
|
u16 hs_csr;
|
|
int ext = 0;
|
|
|
|
hs_cap = pci_bus_find_capability(slot->bus,
|
|
slot->devfn,
|
|
PCI_CAP_ID_CHSWP);
|
|
if (!hs_cap)
|
|
return 0;
|
|
if (pci_bus_read_config_word(slot->bus,
|
|
slot->devfn,
|
|
hs_cap + 2,
|
|
&hs_csr))
|
|
return 0;
|
|
if (hs_csr & HS_CSR_EXT)
|
|
ext = 1;
|
|
return ext;
|
|
}
|
|
|
|
int cpci_clear_ext(struct slot* slot)
|
|
{
|
|
int hs_cap;
|
|
u16 hs_csr;
|
|
|
|
hs_cap = pci_bus_find_capability(slot->bus,
|
|
slot->devfn,
|
|
PCI_CAP_ID_CHSWP);
|
|
if (!hs_cap)
|
|
return -ENODEV;
|
|
if (pci_bus_read_config_word(slot->bus,
|
|
slot->devfn,
|
|
hs_cap + 2,
|
|
&hs_csr))
|
|
return -ENODEV;
|
|
if (hs_csr & HS_CSR_EXT) {
|
|
/* Clear EXT (by setting it) */
|
|
if (pci_bus_write_config_word(slot->bus,
|
|
slot->devfn,
|
|
hs_cap + 2,
|
|
hs_csr))
|
|
return -ENODEV;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int cpci_led_on(struct slot* slot)
|
|
{
|
|
int hs_cap;
|
|
u16 hs_csr;
|
|
|
|
hs_cap = pci_bus_find_capability(slot->bus,
|
|
slot->devfn,
|
|
PCI_CAP_ID_CHSWP);
|
|
if (!hs_cap)
|
|
return -ENODEV;
|
|
if (pci_bus_read_config_word(slot->bus,
|
|
slot->devfn,
|
|
hs_cap + 2,
|
|
&hs_csr))
|
|
return -ENODEV;
|
|
if ((hs_csr & HS_CSR_LOO) != HS_CSR_LOO) {
|
|
hs_csr |= HS_CSR_LOO;
|
|
if (pci_bus_write_config_word(slot->bus,
|
|
slot->devfn,
|
|
hs_cap + 2,
|
|
hs_csr)) {
|
|
err("Could not set LOO for slot %s",
|
|
slot->hotplug_slot->name);
|
|
return -ENODEV;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int cpci_led_off(struct slot* slot)
|
|
{
|
|
int hs_cap;
|
|
u16 hs_csr;
|
|
|
|
hs_cap = pci_bus_find_capability(slot->bus,
|
|
slot->devfn,
|
|
PCI_CAP_ID_CHSWP);
|
|
if (!hs_cap)
|
|
return -ENODEV;
|
|
if (pci_bus_read_config_word(slot->bus,
|
|
slot->devfn,
|
|
hs_cap + 2,
|
|
&hs_csr))
|
|
return -ENODEV;
|
|
if (hs_csr & HS_CSR_LOO) {
|
|
hs_csr &= ~HS_CSR_LOO;
|
|
if (pci_bus_write_config_word(slot->bus,
|
|
slot->devfn,
|
|
hs_cap + 2,
|
|
hs_csr)) {
|
|
err("Could not clear LOO for slot %s",
|
|
slot->hotplug_slot->name);
|
|
return -ENODEV;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* Device configuration functions
|
|
*/
|
|
|
|
int __ref cpci_configure_slot(struct slot *slot)
|
|
{
|
|
struct pci_bus *parent;
|
|
int fn;
|
|
|
|
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_get_slot(slot->bus, 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);
|
|
slot->dev = pci_get_slot(slot->bus, slot->devfn);
|
|
if (slot->dev == NULL) {
|
|
err("Could not find PCI device for slot %02x", slot->number);
|
|
return -ENODEV;
|
|
}
|
|
}
|
|
parent = slot->dev->bus;
|
|
|
|
for (fn = 0; fn < 8; fn++) {
|
|
struct pci_dev *dev;
|
|
|
|
dev = pci_get_slot(parent, PCI_DEVFN(PCI_SLOT(slot->devfn), fn));
|
|
if (!dev)
|
|
continue;
|
|
if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) ||
|
|
(dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) {
|
|
/* Find an unused bus number for the new bridge */
|
|
struct pci_bus *child;
|
|
unsigned char busnr, start = parent->secondary;
|
|
unsigned char end = parent->subordinate;
|
|
|
|
for (busnr = start; busnr <= end; busnr++) {
|
|
if (!pci_find_bus(pci_domain_nr(parent),
|
|
busnr))
|
|
break;
|
|
}
|
|
if (busnr >= end) {
|
|
err("No free bus for hot-added bridge\n");
|
|
pci_dev_put(dev);
|
|
continue;
|
|
}
|
|
child = pci_add_new_bus(parent, dev, busnr);
|
|
if (!child) {
|
|
err("Cannot add new bus for %s\n",
|
|
pci_name(dev));
|
|
pci_dev_put(dev);
|
|
continue;
|
|
}
|
|
child->subordinate = pci_do_scan_bus(child);
|
|
pci_bus_size_bridges(child);
|
|
}
|
|
pci_dev_put(dev);
|
|
}
|
|
|
|
pci_bus_assign_resources(parent);
|
|
pci_bus_add_devices(parent);
|
|
pci_enable_bridges(parent);
|
|
|
|
dbg("%s - exit", __FUNCTION__);
|
|
return 0;
|
|
}
|
|
|
|
int cpci_unconfigure_slot(struct slot* slot)
|
|
{
|
|
int i;
|
|
struct pci_dev *dev;
|
|
|
|
dbg("%s - enter", __FUNCTION__);
|
|
if (!slot->dev) {
|
|
err("No device for slot %02x\n", slot->number);
|
|
return -ENODEV;
|
|
}
|
|
|
|
for (i = 0; i < 8; i++) {
|
|
dev = pci_get_slot(slot->bus,
|
|
PCI_DEVFN(PCI_SLOT(slot->devfn), i));
|
|
if (dev) {
|
|
pci_remove_bus_device(dev);
|
|
pci_dev_put(dev);
|
|
}
|
|
}
|
|
pci_dev_put(slot->dev);
|
|
slot->dev = NULL;
|
|
|
|
dbg("%s - exit", __FUNCTION__);
|
|
return 0;
|
|
}
|