/*
* ACPI PCI HotPlug glue functions to ACPI CA subsystem
*
* Copyright (C) 2002,2003 Takayoshi Kochi (t-kochi@bq.jp.nec.com)
* Copyright (C) 2002 Hiroshi Aono (h-aono@ap.jp.nec.com)
* Copyright (C) 2002,2003 NEC Corporation
* Copyright (C) 2003-2005 Matthew Wilcox (matthew.wilcox@hp.com)
* Copyright (C) 2003-2005 Hewlett Packard
*
* 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 <t-kochi@bq.jp.nec.com>
*
*/
/*
* Lifetime rules for pci_dev:
* - The one in acpiphp_func has its refcount elevated by pci_get_slot()
* when the driver is loaded or when an insertion event occurs. It loses
* a refcount when its ejected or the driver unloads.
* - The one in acpiphp_bridge has its refcount elevated by pci_get_slot()
* when the bridge is scanned and it loses a refcount when the bridge
* is removed.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/smp_lock.h>
#include <asm/semaphore.h>
#include "../pci.h"
#include "pci_hotplug.h"
#include "acpiphp.h"
static LIST_HEAD(bridge_list);
#define MY_NAME "acpiphp_glue"
static void handle_hotplug_event_bridge (acpi_handle, u32, void *);
static void handle_hotplug_event_func (acpi_handle, u32, void *);
/*
* initialization & terminatation routines
*/
/**
* is_ejectable - determine if a slot is ejectable
* @handle: handle to acpi namespace
*
* Ejectable slot should satisfy at least these conditions:
*
* 1. has _ADR method
* 2. has _EJ0 method
*
* optionally
*
* 1. has _STA method
* 2. has _PS0 method
* 3. has _PS3 method
* 4. ..
*
*/
static int is_ejectable(acpi_handle handle)
{
acpi_status status;
acpi_handle tmp;
status = acpi_get_handle(handle, "_ADR", &tmp);
if (ACPI_FAILURE(status)) {
return 0;
}
status = acpi_get_handle(handle, "_EJ0", &tmp);
if (ACPI_FAILURE(status)) {
return 0;
}
return 1;
}
/* callback routine to check the existence of ejectable slots */
static acpi_status
is_ejectable_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
{
int *count = (int *)context;
if (is_ejectable(handle)) {
(*count)++;
/* only one ejectable slot is enough */
return AE_CTRL_TERMINATE;
} else {
return AE_OK;
}
}
/* callback routine to register each ACPI PCI slot object */
static acpi_status
register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
{
struct acpiphp_bridge *bridge = (struct acpiphp_bridge *)context;
struct acpiphp_slot *slot;
struct acpiphp_func *newfunc;
acpi_handle tmp;
acpi_status status = AE_OK;
unsigned long adr, sun;
int device, function;
static int num_slots = 0; /* XXX if we support I/O node hotplug... */
status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
if (ACPI_FAILURE(status))
return AE_OK;
status = acpi_get_handle(handle, "_EJ0", &tmp);
if (ACPI_FAILURE(status))
return AE_OK;
device = (adr >> 16) & 0xffff;
function = adr & 0xffff;
newfunc = kmalloc(sizeof(struct acpiphp_func), GFP_KERNEL);
if (!newfunc)
return AE_NO_MEMORY;
memset(newfunc, 0, sizeof(struct acpiphp_func));
INIT_LIST_HEAD(&newfunc->sibling);
newfunc->handle = handle;
newfunc->function = function;
newfunc->flags = FUNC_HAS_EJ0;
if (ACPI_SUCCESS(acpi_get_handle(handle, "_STA", &tmp)))
newfunc->flags |= FUNC_HAS_STA;
if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS0", &tmp)))
newfunc->flags |= FUNC_HAS_PS0;
if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS3", &tmp)))
newfunc->flags |= FUNC_HAS_PS3;
status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
if (ACPI_FAILURE(status))
sun = -1;
/* search for objects that share the same slot */
for (slot = bridge->slots; slot; slot = slot->next)
if (slot->device == device) {
if (slot->sun != sun)
warn("sibling found, but _SUN doesn't match!\n");
break;
}
if (!slot) {
slot = kmalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
if (!slot) {
kfree(newfunc);
return AE_NO_MEMORY;
}
memset(slot, 0, sizeof(struct acpiphp_slot));
slot->bridge = bridge;
slot->id = num_slots++;
slot->device = device;
slot->sun = sun;
INIT_LIST_HEAD(&slot->funcs);
init_MUTEX(&slot->crit_sect);
slot->next = bridge->slots;
bridge->slots = slot;
bridge->nr_slots++;
dbg("found ACPI PCI Hotplug slot %d at PCI %04x:%02x:%02x\n",
slot->sun, pci_domain_nr(bridge->pci_bus),
bridge->pci_bus->number, slot->device);
}
newfunc->slot = slot;
list_add_tail(&newfunc->sibling, &slot->funcs);
/* associate corresponding pci_dev */
newfunc->pci_dev = pci_get_slot(bridge->pci_bus,
PCI_DEVFN(device, function));
if (newfunc->pci_dev) {
slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON);
}
/* install notify handler */
status = acpi_install_notify_handler(handle,
ACPI_SYSTEM_NOTIFY,
handle_hotplug_event_func,
newfunc);
if (ACPI_FAILURE(status)) {
err("failed to register interrupt notify handler\n");
return status;
}
return AE_OK;
}
/* see if it's worth looking at this bridge */
static int detect_ejectable_slots(acpi_handle *bridge_handle)
{
acpi_status status;
int count;
count = 0;
/* only check slots defined directly below bridge object */
status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge_handle, (u32)1,
is_ejectable_slot, (void *)&count, NULL);
return count;
}
/* decode ACPI 2.0 _HPP hot plug parameters */
static void decode_hpp(struct acpiphp_bridge *bridge)
{
acpi_status status;
struct acpi_buffer buffer = { .length = ACPI_ALLOCATE_BUFFER,
.pointer = NULL};
union acpi_object *package;
int i;
/* default numbers */
bridge->hpp.cache_line_size = 0x10;
bridge->hpp.latency_timer = 0x40;
bridge->hpp.enable_SERR = 0;
bridge->hpp.enable_PERR = 0;
status = acpi_evaluate_object(bridge->handle, "_HPP", NULL, &buffer);
if (ACPI_FAILURE(status)) {
dbg("_HPP evaluation failed\n");
return;
}
package = (union acpi_object *) buffer.pointer;
if (!package || package->type != ACPI_TYPE_PACKAGE ||
package->package.count != 4 || !package->package.elements) {
err("invalid _HPP object; ignoring\n");
goto err_exit;
}
for (i = 0; i < 4; i++) {
if (package->package.elements[i].type != ACPI_TYPE_INTEGER) {
err("invalid _HPP parameter type; ignoring\n");
goto err_exit;
}
}
bridge->hpp.cache_line_size = package->package.elements[0].integer.value;
bridge->hpp.latency_timer = package->package.elements[1].integer.value;
bridge->hpp.enable_SERR = package->package.elements[2].integer.value;
bridge->hpp.enable_PERR = package->package.elements[3].integer.value;
dbg("_HPP parameter = (%02x, %02x, %02x, %02x)\n",
bridge->hpp.cache_line_size,
bridge->hpp.latency_timer,
bridge->hpp.enable_SERR,
bridge->hpp.enable_PERR);
bridge->flags |= BRIDGE_HAS_HPP;
err_exit:
kfree(buffer.pointer);
}
/* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */
static void init_bridge_misc(struct acpiphp_bridge *bridge)
{
acpi_status status;
/* decode ACPI 2.0 _HPP (hot plug parameters) */
decode_hpp(bridge);
/* register all slot objects under this bridge */
status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1,
register_slot, bridge, NULL);
/* install notify handler */
status = acpi_install_notify_handler(bridge->handle,
ACPI_SYSTEM_NOTIFY,
handle_hotplug_event_bridge,
bridge);
if (ACPI_FAILURE(status)) {
err("failed to register interrupt notify handler\n");
}
list_add(&bridge->list, &bridge_list);
}
/* allocate and initialize host bridge data structure */
static void add_host_bridge(acpi_handle *handle, struct pci_bus *pci_bus)
{
struct acpiphp_bridge *bridge;
bridge = kmalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
if (bridge == NULL)
return;
memset(bridge, 0, sizeof(struct acpiphp_bridge));
bridge->type = BRIDGE_TYPE_HOST;
bridge->handle = handle;
bridge->pci_bus = pci_bus;
spin_lock_init(&bridge->res_lock);
init_bridge_misc(bridge);
}
/* allocate and initialize PCI-to-PCI bridge data structure */
static void add_p2p_bridge(acpi_handle *handle, struct pci_dev *pci_dev)
{
struct acpiphp_bridge *bridge;
bridge = kmalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
if (bridge == NULL) {
err("out of memory\n");
return;
}
memset(bridge, 0, sizeof(struct acpiphp_bridge));
bridge->type = BRIDGE_TYPE_P2P;
bridge->handle = handle;
bridge->pci_dev = pci_dev_get(pci_dev);
bridge->pci_bus = pci_dev->subordinate;
if (!bridge->pci_bus) {
err("This is not a PCI-to-PCI bridge!\n");
goto err;
}
spin_lock_init(&bridge->res_lock);
init_bridge_misc(bridge);
return;
err:
pci_dev_put(pci_dev);
kfree(bridge);
return;
}
/* callback routine to find P2P bridges */
static acpi_status
find_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
{
acpi_status status;
acpi_handle dummy_handle;
unsigned long tmp;
int device, function;
struct pci_dev *dev;
struct pci_bus *pci_bus = context;
status = acpi_get_handle(handle, "_ADR", &dummy_handle);
if (ACPI_FAILURE(status))
return AE_OK; /* continue */
status = acpi_evaluate_integer(handle, "_ADR", NULL, &tmp);
if (ACPI_FAILURE(status)) {
dbg("%s: _ADR evaluation failure\n", __FUNCTION__);
return AE_OK;
}
device = (tmp >> 16) & 0xffff;
function = tmp & 0xffff;
dev = pci_get_slot(pci_bus, PCI_DEVFN(device, function));
if (!dev || !dev->subordinate)
goto out;
/* check if this bridge has ejectable slots */
if (detect_ejectable_slots(handle) > 0) {
dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev));
add_p2p_bridge(handle, dev);
}
out:
pci_dev_put(dev);
return AE_OK;
}
/* find hot-pluggable slots, and then find P2P bridge */
static int add_bridge(acpi_handle handle)
{
acpi_status status;
unsigned long tmp;
int seg, bus;
acpi_handle dummy_handle;
struct pci_bus *pci_bus;
/* if the bridge doesn't have _STA, we assume it is always there */
status = acpi_get_handle(handle, "_STA", &dummy_handle);
if (ACPI_SUCCESS(status)) {
status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp);
if (ACPI_FAILURE(status)) {
dbg("%s: _STA evaluation failure\n", __FUNCTION__);
return 0;
}
if ((tmp & ACPI_STA_FUNCTIONING) == 0)
/* don't register this object */
return 0;
}
/* get PCI segment number */
status = acpi_evaluate_integer(handle, "_SEG", NULL, &tmp);
seg = ACPI_SUCCESS(status) ? tmp : 0;
/* get PCI bus number */
status = acpi_evaluate_integer(handle, "_BBN", NULL, &tmp);
if (ACPI_SUCCESS(status)) {
bus = tmp;
} else {
warn("can't get bus number, assuming 0\n");
bus = 0;
}
pci_bus = pci_find_bus(seg, bus);
if (!pci_bus) {
err("Can't find bus %04x:%02x\n", seg, bus);
return 0;
}
/* check if this bridge has ejectable slots */
if (detect_ejectable_slots(handle) > 0) {
dbg("found PCI host-bus bridge with hot-pluggable slots\n");
add_host_bridge(handle, pci_bus);
return 0;
}
/* search P2P bridges under this host bridge */
status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
find_p2p_bridge, pci_bus, NULL);
if (ACPI_FAILURE(status))
warn("find_p2p_bridge faied (error code = 0x%x)\n",status);
return 0;
}
static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle)
{
struct list_head *head;
list_for_each(head, &bridge_list) {
struct acpiphp_bridge *bridge = list_entry(head,
struct acpiphp_bridge, list);
if (bridge->handle == handle)
return bridge;
}
return NULL;
}
static void cleanup_bridge(struct acpiphp_bridge *bridge)
{
struct list_head *list, *tmp;
struct acpiphp_slot *slot;
acpi_status status;
acpi_handle handle = bridge->handle;
status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
handle_hotplug_event_bridge);
if (ACPI_FAILURE(status))
err("failed to remove notify handler\n");
slot = bridge->slots;
while (slot) {
struct acpiphp_slot *next = slot->next;
list_for_each_safe (list, tmp, &slot->funcs) {
struct acpiphp_func *func;
func = list_entry(list, struct acpiphp_func, sibling);
status = acpi_remove_notify_handler(func->handle,
ACPI_SYSTEM_NOTIFY,
handle_hotplug_event_func);
if (ACPI_FAILURE(status))
err("failed to remove notify handler\n");
pci_dev_put(func->pci_dev);
list_del(list);
kfree(func);
}
kfree(slot);
slot = next;
}
pci_dev_put(bridge->pci_dev);
list_del(&bridge->list);
kfree(bridge);
}
static acpi_status
cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
{
struct acpiphp_bridge *bridge;
if (!(bridge = acpiphp_handle_to_bridge(handle)))
return AE_OK;
cleanup_bridge(bridge);
return AE_OK;
}
static void remove_bridge(acpi_handle handle)
{
struct acpiphp_bridge *bridge;
bridge = acpiphp_handle_to_bridge(handle);
if (bridge) {
cleanup_bridge(bridge);
} else {
/* clean-up p2p bridges under this host bridge */
acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
(u32)1, cleanup_p2p_bridge, NULL, NULL);
}
}
static int power_on_slot(struct acpiphp_slot *slot)
{
acpi_status status;
struct acpiphp_func *func;
struct list_head *l;
int retval = 0;
/* if already enabled, just skip */
if (slot->flags & SLOT_POWEREDON)
goto err_exit;
list_for_each (l, &slot->funcs) {
func = list_entry(l, struct acpiphp_func, sibling);
if (func->flags & FUNC_HAS_PS0) {
dbg("%s: executing _PS0\n", __FUNCTION__);
status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL);
if (ACPI_FAILURE(status)) {
warn("%s: _PS0 failed\n", __FUNCTION__);
retval = -1;
goto err_exit;
} else
break;
}
}
/* TBD: evaluate _STA to check if the slot is enabled */
slot->flags |= SLOT_POWEREDON;
err_exit:
return retval;
}
static int power_off_slot(struct acpiphp_slot *slot)
{
acpi_status status;
struct acpiphp_func *func;
struct list_head *l;
struct acpi_object_list arg_list;
union acpi_object arg;
int retval = 0;
/* if already disabled, just skip */
if ((slot->flags & SLOT_POWEREDON) == 0)
goto err_exit;
list_for_each (l, &slot->funcs) {
func = list_entry(l, struct acpiphp_func, sibling);
if (func->flags & FUNC_HAS_PS3) {
status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL);
if (ACPI_FAILURE(status)) {
warn("%s: _PS3 failed\n", __FUNCTION__);
retval = -1;
goto err_exit;
} else
break;
}
}
list_for_each (l, &slot->funcs) {
func = list_entry(l, struct acpiphp_func, sibling);
/* We don't want to call _EJ0 on non-existing functions. */
if (func->flags & FUNC_HAS_EJ0) {
/* _EJ0 method take one argument */
arg_list.count = 1;
arg_list.pointer = &arg;
arg.type = ACPI_TYPE_INTEGER;
arg.integer.value = 1;
status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL);
if (ACPI_FAILURE(status)) {
warn("%s: _EJ0 failed\n", __FUNCTION__);
retval = -1;
goto err_exit;
} else
break;
}
}
/* TBD: evaluate _STA to check if the slot is disabled */
slot->flags &= (~SLOT_POWEREDON);
err_exit:
return retval;
}
/**
* enable_device - enable, configure a slot
* @slot: slot to be enabled
*
* This function should be called per *physical slot*,
* not per each slot object in ACPI namespace.
*
*/
static int enable_device(struct acpiphp_slot *slot)
{
struct pci_dev *dev;
struct pci_bus *bus = slot->bridge->pci_bus;
struct list_head *l;
struct acpiphp_func *func;
int retval = 0;
int num, max, pass;
if (slot->flags & SLOT_ENABLED)
goto err_exit;
/* sanity check: dev should be NULL when hot-plugged in */
dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0));
if (dev) {
/* This case shouldn't happen */
err("pci_dev structure already exists.\n");
pci_dev_put(dev);
retval = -1;
goto err_exit;
}
num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0));
if (num == 0) {
err("No new device found\n");
retval = -1;
goto err_exit;
}
max = bus->secondary;
for (pass = 0; pass < 2; pass++) {
list_for_each_entry(dev, &bus->devices, bus_list) {
if (PCI_SLOT(dev->devfn) != slot->device)
continue;
if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
max = pci_scan_bridge(bus, dev, max, pass);
}
}
pci_bus_assign_resources(bus);
pci_bus_add_devices(bus);
/* associate pci_dev to our representation */
list_for_each (l, &slot->funcs) {
func = list_entry(l, struct acpiphp_func, sibling);
func->pci_dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
func->function));
}
slot->flags |= SLOT_ENABLED;
err_exit:
return retval;
}
/**
* disable_device - disable a slot
*/
static int disable_device(struct acpiphp_slot *slot)
{
int retval = 0;
struct acpiphp_func *func;
struct list_head *l;
/* is this slot already disabled? */
if (!(slot->flags & SLOT_ENABLED))
goto err_exit;
list_for_each (l, &slot->funcs) {
func = list_entry(l, struct acpiphp_func, sibling);
if (!func->pci_dev)
continue;
pci_remove_bus_device(func->pci_dev);
pci_dev_put(func->pci_dev);
func->pci_dev = NULL;
}
slot->flags &= (~SLOT_ENABLED);
err_exit:
return retval;
}
/**
* get_slot_status - get ACPI slot status
*
* if a slot has _STA for each function and if any one of them
* returned non-zero status, return it
*
* if a slot doesn't have _STA and if any one of its functions'
* configuration space is configured, return 0x0f as a _STA
*
* otherwise return 0
*/
static unsigned int get_slot_status(struct acpiphp_slot *slot)
{
acpi_status status;
unsigned long sta = 0;
u32 dvid;
struct list_head *l;
struct acpiphp_func *func;
list_for_each (l, &slot->funcs) {
func = list_entry(l, struct acpiphp_func, sibling);
if (func->flags & FUNC_HAS_STA) {
status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta);
if (ACPI_SUCCESS(status) && sta)
break;
} else {
pci_bus_read_config_dword(slot->bridge->pci_bus,
PCI_DEVFN(slot->device,
func->function),
PCI_VENDOR_ID, &dvid);
if (dvid != 0xffffffff) {
sta = ACPI_STA_ALL;
break;
}
}
}
return (unsigned int)sta;
}
/**
* acpiphp_check_bridge - re-enumerate devices
*
* Iterate over all slots under this bridge and make sure that if a
* card is present they are enabled, and if not they are disabled.
*/
static int acpiphp_check_bridge(struct acpiphp_bridge *bridge)
{
struct acpiphp_slot *slot;
int retval = 0;
int enabled, disabled;
enabled = disabled = 0;
for (slot = bridge->slots; slot; slot = slot->next) {
unsigned int status = get_slot_status(slot);
if (slot->flags & SLOT_ENABLED) {
if (status == ACPI_STA_ALL)
continue;
retval = acpiphp_disable_slot(slot);
if (retval) {
err("Error occurred in disabling\n");
goto err_exit;
}
disabled++;
} else {
if (status != ACPI_STA_ALL)
continue;
retval = acpiphp_enable_slot(slot);
if (retval) {
err("Error occurred in enabling\n");
goto err_exit;
}
enabled++;
}
}
dbg("%s: %d enabled, %d disabled\n", __FUNCTION__, enabled, disabled);
err_exit:
return retval;
}
/*
* ACPI event handlers
*/
/**
* handle_hotplug_event_bridge - handle ACPI event on bridges
*
* @handle: Notify()'ed acpi_handle
* @type: Notify code
* @context: pointer to acpiphp_bridge structure
*
* handles ACPI event notification on {host,p2p} bridges
*
*/
static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, void *context)
{
struct acpiphp_bridge *bridge;
char objname[64];
struct acpi_buffer buffer = { .length = sizeof(objname),
.pointer = objname };
bridge = (struct acpiphp_bridge *)context;
acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
switch (type) {
case ACPI_NOTIFY_BUS_CHECK:
/* bus re-enumerate */
dbg("%s: Bus check notify on %s\n", __FUNCTION__, objname);
acpiphp_check_bridge(bridge);
break;
case ACPI_NOTIFY_DEVICE_CHECK:
/* device check */
dbg("%s: Device check notify on %s\n", __FUNCTION__, objname);
acpiphp_check_bridge(bridge);
break;
case ACPI_NOTIFY_DEVICE_WAKE:
/* wake event */
dbg("%s: Device wake notify on %s\n", __FUNCTION__, objname);
break;
case ACPI_NOTIFY_EJECT_REQUEST:
/* request device eject */
dbg("%s: Device eject notify on %s\n", __FUNCTION__, objname);
break;
case ACPI_NOTIFY_FREQUENCY_MISMATCH:
printk(KERN_ERR "Device %s cannot be configured due"
" to a frequency mismatch\n", objname);
break;
case ACPI_NOTIFY_BUS_MODE_MISMATCH:
printk(KERN_ERR "Device %s cannot be configured due"
" to a bus mode mismatch\n", objname);
break;
case ACPI_NOTIFY_POWER_FAULT:
printk(KERN_ERR "Device %s has suffered a power fault\n",
objname);
break;
default:
warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
break;
}
}
/**
* handle_hotplug_event_func - handle ACPI event on functions (i.e. slots)
*
* @handle: Notify()'ed acpi_handle
* @type: Notify code
* @context: pointer to acpiphp_func structure
*
* handles ACPI event notification on slots
*
*/
static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context)
{
struct acpiphp_func *func;
char objname[64];
struct acpi_buffer buffer = { .length = sizeof(objname),
.pointer = objname };
acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
func = (struct acpiphp_func *)context;
switch (type) {
case ACPI_NOTIFY_BUS_CHECK:
/* bus re-enumerate */
dbg("%s: Bus check notify on %s\n", __FUNCTION__, objname);
acpiphp_enable_slot(func->slot);
break;
case ACPI_NOTIFY_DEVICE_CHECK:
/* device check : re-enumerate from parent bus */
dbg("%s: Device check notify on %s\n", __FUNCTION__, objname);
acpiphp_check_bridge(func->slot->bridge);
break;
case ACPI_NOTIFY_DEVICE_WAKE:
/* wake event */
dbg("%s: Device wake notify on %s\n", __FUNCTION__, objname);
break;
case ACPI_NOTIFY_EJECT_REQUEST:
/* request device eject */
dbg("%s: Device eject notify on %s\n", __FUNCTION__, objname);
acpiphp_disable_slot(func->slot);
break;
default:
warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
break;
}
}
static struct acpi_pci_driver acpi_pci_hp_driver = {
.add = add_bridge,
.remove = remove_bridge,
};
/**
* acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures
*
*/
int __init acpiphp_glue_init(void)
{
int num;
if (list_empty(&pci_root_buses))
return -1;
num = acpi_pci_register_driver(&acpi_pci_hp_driver);
if (num <= 0)
return -1;
return 0;
}
/**
* acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures
*
* This function frees all data allocated in acpiphp_glue_init()
*/
void __exit acpiphp_glue_exit(void)
{
acpi_pci_unregister_driver(&acpi_pci_hp_driver);
}
/**
* acpiphp_get_num_slots - count number of slots in a system
*/
int __init acpiphp_get_num_slots(void)
{
struct list_head *node;
struct acpiphp_bridge *bridge;
int num_slots;
num_slots = 0;
list_for_each (node, &bridge_list) {
bridge = (struct acpiphp_bridge *)node;
dbg("Bus %04x:%02x has %d slot%s\n",
pci_domain_nr(bridge->pci_bus),
bridge->pci_bus->number, bridge->nr_slots,
bridge->nr_slots == 1 ? "" : "s");
num_slots += bridge->nr_slots;
}
dbg("Total %d slots\n", num_slots);
return num_slots;
}
#if 0
/**
* acpiphp_for_each_slot - call function for each slot
* @fn: callback function
* @data: context to be passed to callback function
*
*/
static int acpiphp_for_each_slot(acpiphp_callback fn, void *data)
{
struct list_head *node;
struct acpiphp_bridge *bridge;
struct acpiphp_slot *slot;
int retval = 0;
list_for_each (node, &bridge_list) {
bridge = (struct acpiphp_bridge *)node;
for (slot = bridge->slots; slot; slot = slot->next) {
retval = fn(slot, data);
if (!retval)
goto err_exit;
}
}
err_exit:
return retval;
}
#endif
/* search matching slot from id */
struct acpiphp_slot *get_slot_from_id(int id)
{
struct list_head *node;
struct acpiphp_bridge *bridge;
struct acpiphp_slot *slot;
list_for_each (node, &bridge_list) {
bridge = (struct acpiphp_bridge *)node;
for (slot = bridge->slots; slot; slot = slot->next)
if (slot->id == id)
return slot;
}
/* should never happen! */
err("%s: no object for id %d\n", __FUNCTION__, id);
WARN_ON(1);
return NULL;
}
/**
* acpiphp_enable_slot - power on slot
*/
int acpiphp_enable_slot(struct acpiphp_slot *slot)
{
int retval;
down(&slot->crit_sect);
/* wake up all functions */
retval = power_on_slot(slot);
if (retval)
goto err_exit;
if (get_slot_status(slot) == ACPI_STA_ALL)
/* configure all functions */
retval = enable_device(slot);
err_exit:
up(&slot->crit_sect);
return retval;
}
/**
* acpiphp_disable_slot - power off slot
*/
int acpiphp_disable_slot(struct acpiphp_slot *slot)
{
int retval = 0;
down(&slot->crit_sect);
/* unconfigure all functions */
retval = disable_device(slot);
if (retval)
goto err_exit;
/* power off all functions */
retval = power_off_slot(slot);
if (retval)
goto err_exit;
err_exit:
up(&slot->crit_sect);
return retval;
}
/*
* slot enabled: 1
* slot disabled: 0
*/
u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
{
unsigned int sta;
sta = get_slot_status(slot);
return (sta & ACPI_STA_ENABLED) ? 1 : 0;
}
/*
* latch closed: 1
* latch open: 0
*/
u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
{
unsigned int sta;
sta = get_slot_status(slot);
return (sta & ACPI_STA_SHOW_IN_UI) ? 1 : 0;
}
/*
* adapter presence : 1
* absence : 0
*/
u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
{
unsigned int sta;
sta = get_slot_status(slot);
return (sta == 0) ? 0 : 1;
}
/*
* pci address (seg/bus/dev)
*/
u32 acpiphp_get_address(struct acpiphp_slot *slot)
{
u32 address;
struct pci_bus *pci_bus = slot->bridge->pci_bus;
address = (pci_domain_nr(pci_bus) << 16) |
(pci_bus->number << 8) |
slot->device;
return address;
}
