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linux/drivers/pci/hotplug/pciehp_ctrl.c
rajesh.shah@intel.com 71b720c0f9 [PATCH] patch 1/8] pciehp: use the PCI core for hotplug resource management
This patch converts the pci express hotplug controller driver
to use the PCI core for resource management. This eliminates a
lot of duplicated code and integrates pciehp with the system's
normal PCI handling code.

Signed-off-by: Rajesh Shah <rajesh.shah@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-11-10 16:09:14 -08:00

1200 lines
30 KiB
C

/*
* PCI Express Hot Plug Controller Driver
*
* Copyright (C) 1995,2001 Compaq Computer Corporation
* Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
* Copyright (C) 2001 IBM Corp.
* Copyright (C) 2003-2004 Intel Corporation
*
* 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 <greg@kroah.com>, <kristen.c.accardi@intel.com>
*
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/wait.h>
#include <linux/smp_lock.h>
#include <linux/pci.h>
#include "../pci.h"
#include "pciehp.h"
#include "pciehprm.h"
static void interrupt_event_handler(struct controller *ctrl);
static struct semaphore event_semaphore; /* mutex for process loop (up if something to process) */
static struct semaphore event_exit; /* guard ensure thread has exited before calling it quits */
static int event_finished;
static unsigned long pushbutton_pending; /* = 0 */
static unsigned long surprise_rm_pending; /* = 0 */
u8 pciehp_handle_attention_button(u8 hp_slot, void *inst_id)
{
struct controller *ctrl = (struct controller *) inst_id;
struct slot *p_slot;
u8 rc = 0;
u8 getstatus;
struct pci_func *func;
struct event_info *taskInfo;
/* Attention Button Change */
dbg("pciehp: Attention button interrupt received.\n");
func = pciehp_slot_find(ctrl->slot_bus, (hp_slot + ctrl->slot_device_offset), 0);
/* This is the structure that tells the worker thread what to do */
taskInfo = &(ctrl->event_queue[ctrl->next_event]);
p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
p_slot->hpc_ops->get_adapter_status(p_slot, &(func->presence_save));
p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
ctrl->next_event = (ctrl->next_event + 1) % 10;
taskInfo->hp_slot = hp_slot;
rc++;
/*
* Button pressed - See if need to TAKE ACTION!!!
*/
info("Button pressed on Slot(%d)\n", ctrl->first_slot + hp_slot);
taskInfo->event_type = INT_BUTTON_PRESS;
if ((p_slot->state == BLINKINGON_STATE)
|| (p_slot->state == BLINKINGOFF_STATE)) {
/* Cancel if we are still blinking; this means that we press the
* attention again before the 5 sec. limit expires to cancel hot-add
* or hot-remove
*/
taskInfo->event_type = INT_BUTTON_CANCEL;
info("Button cancel on Slot(%d)\n", ctrl->first_slot + hp_slot);
} else if ((p_slot->state == POWERON_STATE)
|| (p_slot->state == POWEROFF_STATE)) {
/* Ignore if the slot is on power-on or power-off state; this
* means that the previous attention button action to hot-add or
* hot-remove is undergoing
*/
taskInfo->event_type = INT_BUTTON_IGNORE;
info("Button ignore on Slot(%d)\n", ctrl->first_slot + hp_slot);
}
if (rc)
up(&event_semaphore); /* signal event thread that new event is posted */
return 0;
}
u8 pciehp_handle_switch_change(u8 hp_slot, void *inst_id)
{
struct controller *ctrl = (struct controller *) inst_id;
struct slot *p_slot;
u8 rc = 0;
u8 getstatus;
struct pci_func *func;
struct event_info *taskInfo;
/* Switch Change */
dbg("pciehp: Switch interrupt received.\n");
func = pciehp_slot_find(ctrl->slot_bus, (hp_slot + ctrl->slot_device_offset), 0);
/* This is the structure that tells the worker thread
* what to do
*/
taskInfo = &(ctrl->event_queue[ctrl->next_event]);
ctrl->next_event = (ctrl->next_event + 1) % 10;
taskInfo->hp_slot = hp_slot;
rc++;
p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
p_slot->hpc_ops->get_adapter_status(p_slot, &(func->presence_save));
p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
if (getstatus) {
/*
* Switch opened
*/
info("Latch open on Slot(%d)\n", ctrl->first_slot + hp_slot);
func->switch_save = 0;
taskInfo->event_type = INT_SWITCH_OPEN;
} else {
/*
* Switch closed
*/
info("Latch close on Slot(%d)\n", ctrl->first_slot + hp_slot);
func->switch_save = 0x10;
taskInfo->event_type = INT_SWITCH_CLOSE;
}
if (rc)
up(&event_semaphore); /* signal event thread that new event is posted */
return rc;
}
u8 pciehp_handle_presence_change(u8 hp_slot, void *inst_id)
{
struct controller *ctrl = (struct controller *) inst_id;
struct slot *p_slot;
u8 rc = 0;
struct pci_func *func;
struct event_info *taskInfo;
/* Presence Change */
dbg("pciehp: Presence/Notify input change.\n");
func = pciehp_slot_find(ctrl->slot_bus, (hp_slot + ctrl->slot_device_offset), 0);
/* This is the structure that tells the worker thread
* what to do
*/
taskInfo = &(ctrl->event_queue[ctrl->next_event]);
ctrl->next_event = (ctrl->next_event + 1) % 10;
taskInfo->hp_slot = hp_slot;
rc++;
p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
/* Switch is open, assume a presence change
* Save the presence state
*/
p_slot->hpc_ops->get_adapter_status(p_slot, &(func->presence_save));
if (func->presence_save) {
/*
* Card Present
*/
info("Card present on Slot(%d)\n", ctrl->first_slot + hp_slot);
taskInfo->event_type = INT_PRESENCE_ON;
} else {
/*
* Not Present
*/
info("Card not present on Slot(%d)\n", ctrl->first_slot + hp_slot);
taskInfo->event_type = INT_PRESENCE_OFF;
}
if (rc)
up(&event_semaphore); /* signal event thread that new event is posted */
return rc;
}
u8 pciehp_handle_power_fault(u8 hp_slot, void *inst_id)
{
struct controller *ctrl = (struct controller *) inst_id;
struct slot *p_slot;
u8 rc = 0;
struct pci_func *func;
struct event_info *taskInfo;
/* power fault */
dbg("pciehp: Power fault interrupt received.\n");
func = pciehp_slot_find(ctrl->slot_bus, (hp_slot + ctrl->slot_device_offset), 0);
/* this is the structure that tells the worker thread
* what to do
*/
taskInfo = &(ctrl->event_queue[ctrl->next_event]);
ctrl->next_event = (ctrl->next_event + 1) % 10;
taskInfo->hp_slot = hp_slot;
rc++;
p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
if ( !(p_slot->hpc_ops->query_power_fault(p_slot))) {
/*
* power fault Cleared
*/
info("Power fault cleared on Slot(%d)\n", ctrl->first_slot + hp_slot);
func->status = 0x00;
taskInfo->event_type = INT_POWER_FAULT_CLEAR;
} else {
/*
* power fault
*/
info("Power fault on Slot(%d)\n", ctrl->first_slot + hp_slot);
taskInfo->event_type = INT_POWER_FAULT;
/* set power fault status for this board */
func->status = 0xFF;
info("power fault bit %x set\n", hp_slot);
}
if (rc)
up(&event_semaphore); /* signal event thread that new event is posted */
return rc;
}
/**
* pciehp_slot_create - Creates a node and adds it to the proper bus.
* @busnumber - bus where new node is to be located
*
* Returns pointer to the new node or NULL if unsuccessful
*/
struct pci_func *pciehp_slot_create(u8 busnumber)
{
struct pci_func *new_slot;
struct pci_func *next;
dbg("%s: busnumber %x\n", __FUNCTION__, busnumber);
new_slot = kmalloc(sizeof(struct pci_func), GFP_KERNEL);
if (new_slot == NULL)
return new_slot;
memset(new_slot, 0, sizeof(struct pci_func));
new_slot->next = NULL;
new_slot->configured = 1;
if (pciehp_slot_list[busnumber] == NULL) {
pciehp_slot_list[busnumber] = new_slot;
} else {
next = pciehp_slot_list[busnumber];
while (next->next != NULL)
next = next->next;
next->next = new_slot;
}
return new_slot;
}
/**
* slot_remove - Removes a node from the linked list of slots.
* @old_slot: slot to remove
*
* Returns 0 if successful, !0 otherwise.
*/
static int slot_remove(struct pci_func * old_slot)
{
struct pci_func *next;
if (old_slot == NULL)
return 1;
next = pciehp_slot_list[old_slot->bus];
if (next == NULL)
return 1;
if (next == old_slot) {
pciehp_slot_list[old_slot->bus] = old_slot->next;
kfree(old_slot);
return 0;
}
while ((next->next != old_slot) && (next->next != NULL)) {
next = next->next;
}
if (next->next == old_slot) {
next->next = old_slot->next;
kfree(old_slot);
return 0;
} else
return 2;
}
/**
* bridge_slot_remove - Removes a node from the linked list of slots.
* @bridge: bridge to remove
*
* Returns 0 if successful, !0 otherwise.
*/
static int bridge_slot_remove(struct pci_func *bridge)
{
u8 subordinateBus, secondaryBus;
u8 tempBus;
struct pci_func *next;
if (bridge == NULL)
return 1;
secondaryBus = (bridge->config_space[0x06] >> 8) & 0xFF;
subordinateBus = (bridge->config_space[0x06] >> 16) & 0xFF;
for (tempBus = secondaryBus; tempBus <= subordinateBus; tempBus++) {
next = pciehp_slot_list[tempBus];
while (!slot_remove(next)) {
next = pciehp_slot_list[tempBus];
}
}
next = pciehp_slot_list[bridge->bus];
if (next == NULL) {
return 1;
}
if (next == bridge) {
pciehp_slot_list[bridge->bus] = bridge->next;
kfree(bridge);
return 0;
}
while ((next->next != bridge) && (next->next != NULL)) {
next = next->next;
}
if (next->next == bridge) {
next->next = bridge->next;
kfree(bridge);
return 0;
} else
return 2;
}
/**
* pciehp_slot_find - Looks for a node by bus, and device, multiple functions accessed
* @bus: bus to find
* @device: device to find
* @index: is 0 for first function found, 1 for the second...
*
* Returns pointer to the node if successful, %NULL otherwise.
*/
struct pci_func *pciehp_slot_find(u8 bus, u8 device, u8 index)
{
int found = -1;
struct pci_func *func;
func = pciehp_slot_list[bus];
dbg("%s: bus %x device %x index %x\n",
__FUNCTION__, bus, device, index);
if (func != NULL) {
dbg("%s: func-> bus %x device %x function %x pci_dev %p\n",
__FUNCTION__, func->bus, func->device, func->function,
func->pci_dev);
} else
dbg("%s: func == NULL\n", __FUNCTION__);
if ((func == NULL) || ((func->device == device) && (index == 0)))
return func;
if (func->device == device)
found++;
while (func->next != NULL) {
func = func->next;
dbg("%s: In while loop, func-> bus %x device %x function %x pci_dev %p\n",
__FUNCTION__, func->bus, func->device, func->function,
func->pci_dev);
if (func->device == device)
found++;
dbg("%s: while loop, found %d, index %d\n", __FUNCTION__,
found, index);
if ((found == index) || (func->function == index)) {
dbg("%s: Found bus %x dev %x func %x\n", __FUNCTION__,
func->bus, func->device, func->function);
return func;
}
}
return NULL;
}
static int is_bridge(struct pci_func * func)
{
/* Check the header type */
if (((func->config_space[0x03] >> 16) & 0xFF) == 0x01)
return 1;
else
return 0;
}
/* The following routines constitute the bulk of the
hotplug controller logic
*/
static void set_slot_off(struct controller *ctrl, struct slot * pslot)
{
/* Wait for exclusive access to hardware */
down(&ctrl->crit_sect);
/* turn off slot, turn on Amber LED, turn off Green LED if supported*/
if (POWER_CTRL(ctrl->ctrlcap)) {
if (pslot->hpc_ops->power_off_slot(pslot)) {
err("%s: Issue of Slot Power Off command failed\n", __FUNCTION__);
up(&ctrl->crit_sect);
return;
}
wait_for_ctrl_irq (ctrl);
}
if (PWR_LED(ctrl->ctrlcap)) {
pslot->hpc_ops->green_led_off(pslot);
wait_for_ctrl_irq (ctrl);
}
if (ATTN_LED(ctrl->ctrlcap)) {
if (pslot->hpc_ops->set_attention_status(pslot, 1)) {
err("%s: Issue of Set Attention Led command failed\n", __FUNCTION__);
up(&ctrl->crit_sect);
return;
}
wait_for_ctrl_irq (ctrl);
}
/* Done with exclusive hardware access */
up(&ctrl->crit_sect);
}
/**
* board_added - Called after a board has been added to the system.
*
* Turns power on for the board
* Configures board
*
*/
static u32 board_added(struct pci_func * func, struct controller * ctrl)
{
u8 hp_slot;
u32 temp_register = 0xFFFFFFFF;
u32 rc = 0;
struct slot *p_slot;
p_slot = pciehp_find_slot(ctrl, func->device);
hp_slot = func->device - ctrl->slot_device_offset;
dbg("%s: func->device, slot_offset, hp_slot = %d, %d ,%d\n", __FUNCTION__, func->device, ctrl->slot_device_offset, hp_slot);
/* Wait for exclusive access to hardware */
down(&ctrl->crit_sect);
if (POWER_CTRL(ctrl->ctrlcap)) {
/* Power on slot */
rc = p_slot->hpc_ops->power_on_slot(p_slot);
if (rc) {
up(&ctrl->crit_sect);
return -1;
}
/* Wait for the command to complete */
wait_for_ctrl_irq (ctrl);
}
if (PWR_LED(ctrl->ctrlcap)) {
p_slot->hpc_ops->green_led_blink(p_slot);
/* Wait for the command to complete */
wait_for_ctrl_irq (ctrl);
}
/* Done with exclusive hardware access */
up(&ctrl->crit_sect);
/* Wait for ~1 second */
dbg("%s: before long_delay\n", __FUNCTION__);
wait_for_ctrl_irq (ctrl);
dbg("%s: afterlong_delay\n", __FUNCTION__);
/* Check link training status */
rc = p_slot->hpc_ops->check_lnk_status(ctrl);
if (rc) {
err("%s: Failed to check link status\n", __FUNCTION__);
set_slot_off(ctrl, p_slot);
return rc;
}
dbg("%s: func status = %x\n", __FUNCTION__, func->status);
/* Check for a power fault */
if (func->status == 0xFF) {
/* power fault occurred, but it was benign */
temp_register = 0xFFFFFFFF;
dbg("%s: temp register set to %x by power fault\n", __FUNCTION__, temp_register);
rc = POWER_FAILURE;
func->status = 0;
goto err_exit;
}
rc = pciehp_configure_device(p_slot);
if (rc) {
err("Cannot add device 0x%x:%x\n", p_slot->bus,
p_slot->device);
goto err_exit;
}
pciehp_save_slot_config(ctrl, func);
func->status = 0;
func->switch_save = 0x10;
func->is_a_board = 0x01;
/*
* Some PCI Express root ports require fixup after hot-plug operation.
*/
if (pcie_mch_quirk)
pci_fixup_device(pci_fixup_final, ctrl->pci_dev);
if (PWR_LED(ctrl->ctrlcap)) {
/* Wait for exclusive access to hardware */
down(&ctrl->crit_sect);
p_slot->hpc_ops->green_led_on(p_slot);
/* Wait for the command to complete */
wait_for_ctrl_irq (ctrl);
/* Done with exclusive hardware access */
up(&ctrl->crit_sect);
}
return 0;
err_exit:
set_slot_off(ctrl, p_slot);
return -1;
}
/**
* remove_board - Turns off slot and LED's
*
*/
static u32 remove_board(struct pci_func *func, struct controller *ctrl)
{
u8 device;
u8 hp_slot;
u32 rc;
struct slot *p_slot;
if (func == NULL)
return 1;
if (pciehp_unconfigure_device(func))
return 1;
device = func->device;
hp_slot = func->device - ctrl->slot_device_offset;
p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
dbg("In %s, hp_slot = %d\n", __FUNCTION__, hp_slot);
/* Change status to shutdown */
if (func->is_a_board)
func->status = 0x01;
func->configured = 0;
/* Wait for exclusive access to hardware */
down(&ctrl->crit_sect);
if (POWER_CTRL(ctrl->ctrlcap)) {
/* power off slot */
rc = p_slot->hpc_ops->power_off_slot(p_slot);
if (rc) {
err("%s: Issue of Slot Disable command failed\n", __FUNCTION__);
up(&ctrl->crit_sect);
return rc;
}
/* Wait for the command to complete */
wait_for_ctrl_irq (ctrl);
}
if (PWR_LED(ctrl->ctrlcap)) {
/* turn off Green LED */
p_slot->hpc_ops->green_led_off(p_slot);
/* Wait for the command to complete */
wait_for_ctrl_irq (ctrl);
}
/* Done with exclusive hardware access */
up(&ctrl->crit_sect);
if (ctrl->add_support) {
while (func) {
if (is_bridge(func)) {
dbg("PCI Bridge Hot-Remove s:b:d:f(%02x:%02x:%02x:%02x)\n",
ctrl->seg, func->bus, func->device, func->function);
bridge_slot_remove(func);
} else {
dbg("PCI Function Hot-Remove s:b:d:f(%02x:%02x:%02x:%02x)\n",
ctrl->seg, func->bus, func->device, func->function);
slot_remove(func);
}
func = pciehp_slot_find(ctrl->slot_bus, device, 0);
}
/* Setup slot structure with entry for empty slot */
func = pciehp_slot_create(ctrl->slot_bus);
if (func == NULL) {
return 1;
}
func->bus = ctrl->slot_bus;
func->device = device;
func->function = 0;
func->configured = 0;
func->switch_save = 0x10;
func->is_a_board = 0;
}
return 0;
}
static void pushbutton_helper_thread(unsigned long data)
{
pushbutton_pending = data;
up(&event_semaphore);
}
/**
* pciehp_pushbutton_thread
*
* Scheduled procedure to handle blocking stuff for the pushbuttons
* Handles all pending events and exits.
*
*/
static void pciehp_pushbutton_thread(unsigned long slot)
{
struct slot *p_slot = (struct slot *) slot;
u8 getstatus;
pushbutton_pending = 0;
if (!p_slot) {
dbg("%s: Error! slot NULL\n", __FUNCTION__);
return;
}
p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
if (getstatus) {
p_slot->state = POWEROFF_STATE;
dbg("In power_down_board, b:d(%x:%x)\n", p_slot->bus, p_slot->device);
pciehp_disable_slot(p_slot);
p_slot->state = STATIC_STATE;
} else {
p_slot->state = POWERON_STATE;
dbg("In add_board, b:d(%x:%x)\n", p_slot->bus, p_slot->device);
if (pciehp_enable_slot(p_slot) && PWR_LED(p_slot->ctrl->ctrlcap)) {
/* Wait for exclusive access to hardware */
down(&p_slot->ctrl->crit_sect);
p_slot->hpc_ops->green_led_off(p_slot);
/* Wait for the command to complete */
wait_for_ctrl_irq (p_slot->ctrl);
/* Done with exclusive hardware access */
up(&p_slot->ctrl->crit_sect);
}
p_slot->state = STATIC_STATE;
}
return;
}
/**
* pciehp_surprise_rm_thread
*
* Scheduled procedure to handle blocking stuff for the surprise removal
* Handles all pending events and exits.
*
*/
static void pciehp_surprise_rm_thread(unsigned long slot)
{
struct slot *p_slot = (struct slot *) slot;
u8 getstatus;
surprise_rm_pending = 0;
if (!p_slot) {
dbg("%s: Error! slot NULL\n", __FUNCTION__);
return;
}
p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
if (!getstatus) {
p_slot->state = POWEROFF_STATE;
dbg("In removing board, b:d(%x:%x)\n", p_slot->bus, p_slot->device);
pciehp_disable_slot(p_slot);
p_slot->state = STATIC_STATE;
} else {
p_slot->state = POWERON_STATE;
dbg("In add_board, b:d(%x:%x)\n", p_slot->bus, p_slot->device);
if (pciehp_enable_slot(p_slot) && PWR_LED(p_slot->ctrl->ctrlcap)) {
/* Wait for exclusive access to hardware */
down(&p_slot->ctrl->crit_sect);
p_slot->hpc_ops->green_led_off(p_slot);
/* Wait for the command to complete */
wait_for_ctrl_irq (p_slot->ctrl);
/* Done with exclusive hardware access */
up(&p_slot->ctrl->crit_sect);
}
p_slot->state = STATIC_STATE;
}
return;
}
/* this is the main worker thread */
static int event_thread(void* data)
{
struct controller *ctrl;
lock_kernel();
daemonize("pciehpd_event");
unlock_kernel();
while (1) {
dbg("!!!!event_thread sleeping\n");
down_interruptible (&event_semaphore);
dbg("event_thread woken finished = %d\n", event_finished);
if (event_finished || signal_pending(current))
break;
/* Do stuff here */
if (pushbutton_pending)
pciehp_pushbutton_thread(pushbutton_pending);
else if (surprise_rm_pending)
pciehp_surprise_rm_thread(surprise_rm_pending);
else
for (ctrl = pciehp_ctrl_list; ctrl; ctrl=ctrl->next)
interrupt_event_handler(ctrl);
}
dbg("event_thread signals exit\n");
up(&event_exit);
return 0;
}
int pciehp_event_start_thread(void)
{
int pid;
/* initialize our semaphores */
init_MUTEX_LOCKED(&event_exit);
event_finished=0;
init_MUTEX_LOCKED(&event_semaphore);
pid = kernel_thread(event_thread, NULL, 0);
if (pid < 0) {
err ("Can't start up our event thread\n");
return -1;
}
dbg("Our event thread pid = %d\n", pid);
return 0;
}
void pciehp_event_stop_thread(void)
{
event_finished = 1;
dbg("event_thread finish command given\n");
up(&event_semaphore);
dbg("wait for event_thread to exit\n");
down(&event_exit);
}
static int update_slot_info(struct slot *slot)
{
struct hotplug_slot_info *info;
/* char buffer[SLOT_NAME_SIZE]; */
int result;
info = kmalloc(sizeof(struct hotplug_slot_info), GFP_KERNEL);
if (!info)
return -ENOMEM;
/* make_slot_name (&buffer[0], SLOT_NAME_SIZE, slot); */
slot->hpc_ops->get_power_status(slot, &(info->power_status));
slot->hpc_ops->get_attention_status(slot, &(info->attention_status));
slot->hpc_ops->get_latch_status(slot, &(info->latch_status));
slot->hpc_ops->get_adapter_status(slot, &(info->adapter_status));
/* result = pci_hp_change_slot_info(buffer, info); */
result = pci_hp_change_slot_info(slot->hotplug_slot, info);
kfree (info);
return result;
}
static void interrupt_event_handler(struct controller *ctrl)
{
int loop = 0;
int change = 1;
struct pci_func *func;
u8 hp_slot;
u8 getstatus;
struct slot *p_slot;
while (change) {
change = 0;
for (loop = 0; loop < 10; loop++) {
if (ctrl->event_queue[loop].event_type != 0) {
hp_slot = ctrl->event_queue[loop].hp_slot;
func = pciehp_slot_find(ctrl->slot_bus, (hp_slot + ctrl->slot_device_offset), 0);
p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
dbg("hp_slot %d, func %p, p_slot %p\n", hp_slot, func, p_slot);
if (ctrl->event_queue[loop].event_type == INT_BUTTON_CANCEL) {
dbg("button cancel\n");
del_timer(&p_slot->task_event);
switch (p_slot->state) {
case BLINKINGOFF_STATE:
/* Wait for exclusive access to hardware */
down(&ctrl->crit_sect);
if (PWR_LED(ctrl->ctrlcap)) {
p_slot->hpc_ops->green_led_on(p_slot);
/* Wait for the command to complete */
wait_for_ctrl_irq (ctrl);
}
if (ATTN_LED(ctrl->ctrlcap)) {
p_slot->hpc_ops->set_attention_status(p_slot, 0);
/* Wait for the command to complete */
wait_for_ctrl_irq (ctrl);
}
/* Done with exclusive hardware access */
up(&ctrl->crit_sect);
break;
case BLINKINGON_STATE:
/* Wait for exclusive access to hardware */
down(&ctrl->crit_sect);
if (PWR_LED(ctrl->ctrlcap)) {
p_slot->hpc_ops->green_led_off(p_slot);
/* Wait for the command to complete */
wait_for_ctrl_irq (ctrl);
}
if (ATTN_LED(ctrl->ctrlcap)){
p_slot->hpc_ops->set_attention_status(p_slot, 0);
/* Wait for the command to complete */
wait_for_ctrl_irq (ctrl);
}
/* Done with exclusive hardware access */
up(&ctrl->crit_sect);
break;
default:
warn("Not a valid state\n");
return;
}
info(msg_button_cancel, p_slot->number);
p_slot->state = STATIC_STATE;
}
/* ***********Button Pressed (No action on 1st press...) */
else if (ctrl->event_queue[loop].event_type == INT_BUTTON_PRESS) {
if (ATTN_BUTTN(ctrl->ctrlcap)) {
dbg("Button pressed\n");
p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
if (getstatus) {
/* slot is on */
dbg("slot is on\n");
p_slot->state = BLINKINGOFF_STATE;
info(msg_button_off, p_slot->number);
} else {
/* slot is off */
dbg("slot is off\n");
p_slot->state = BLINKINGON_STATE;
info(msg_button_on, p_slot->number);
}
/* Wait for exclusive access to hardware */
down(&ctrl->crit_sect);
/* blink green LED and turn off amber */
if (PWR_LED(ctrl->ctrlcap)) {
p_slot->hpc_ops->green_led_blink(p_slot);
/* Wait for the command to complete */
wait_for_ctrl_irq (ctrl);
}
if (ATTN_LED(ctrl->ctrlcap)) {
p_slot->hpc_ops->set_attention_status(p_slot, 0);
/* Wait for the command to complete */
wait_for_ctrl_irq (ctrl);
}
/* Done with exclusive hardware access */
up(&ctrl->crit_sect);
init_timer(&p_slot->task_event);
p_slot->task_event.expires = jiffies + 5 * HZ; /* 5 second delay */
p_slot->task_event.function = (void (*)(unsigned long)) pushbutton_helper_thread;
p_slot->task_event.data = (unsigned long) p_slot;
dbg("add_timer p_slot = %p\n", (void *) p_slot);
add_timer(&p_slot->task_event);
}
}
/***********POWER FAULT********************/
else if (ctrl->event_queue[loop].event_type == INT_POWER_FAULT) {
if (POWER_CTRL(ctrl->ctrlcap)) {
dbg("power fault\n");
/* Wait for exclusive access to hardware */
down(&ctrl->crit_sect);
if (ATTN_LED(ctrl->ctrlcap)) {
p_slot->hpc_ops->set_attention_status(p_slot, 1);
wait_for_ctrl_irq (ctrl);
}
if (PWR_LED(ctrl->ctrlcap)) {
p_slot->hpc_ops->green_led_off(p_slot);
wait_for_ctrl_irq (ctrl);
}
/* Done with exclusive hardware access */
up(&ctrl->crit_sect);
}
}
/***********SURPRISE REMOVAL********************/
else if ((ctrl->event_queue[loop].event_type == INT_PRESENCE_ON) ||
(ctrl->event_queue[loop].event_type == INT_PRESENCE_OFF)) {
if (HP_SUPR_RM(ctrl->ctrlcap)) {
dbg("Surprise Removal\n");
if (p_slot) {
surprise_rm_pending = (unsigned long) p_slot;
up(&event_semaphore);
update_slot_info(p_slot);
}
}
} else {
/* refresh notification */
if (p_slot)
update_slot_info(p_slot);
}
ctrl->event_queue[loop].event_type = 0;
change = 1;
}
} /* End of FOR loop */
}
}
int pciehp_enable_slot(struct slot *p_slot)
{
u8 getstatus = 0;
int rc;
struct pci_func *func;
func = pciehp_slot_find(p_slot->bus, p_slot->device, 0);
if (!func) {
dbg("%s: Error! slot NULL\n", __FUNCTION__);
return 1;
}
/* Check to see if (latch closed, card present, power off) */
down(&p_slot->ctrl->crit_sect);
rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
if (rc || !getstatus) {
info("%s: no adapter on slot(%x)\n", __FUNCTION__, p_slot->number);
up(&p_slot->ctrl->crit_sect);
return 1;
}
if (MRL_SENS(p_slot->ctrl->ctrlcap)) {
rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
if (rc || getstatus) {
info("%s: latch open on slot(%x)\n", __FUNCTION__, p_slot->number);
up(&p_slot->ctrl->crit_sect);
return 1;
}
}
if (POWER_CTRL(p_slot->ctrl->ctrlcap)) {
rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
if (rc || getstatus) {
info("%s: already enabled on slot(%x)\n", __FUNCTION__, p_slot->number);
up(&p_slot->ctrl->crit_sect);
return 1;
}
}
up(&p_slot->ctrl->crit_sect);
slot_remove(func);
func = pciehp_slot_create(p_slot->bus);
if (func == NULL)
return 1;
func->bus = p_slot->bus;
func->device = p_slot->device;
func->function = 0;
func->configured = 0;
func->is_a_board = 1;
/* We have to save the presence info for these slots */
p_slot->hpc_ops->get_adapter_status(p_slot, &(func->presence_save));
p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
func->switch_save = !getstatus? 0x10:0;
rc = board_added(func, p_slot->ctrl);
if (rc) {
if (is_bridge(func))
bridge_slot_remove(func);
else
slot_remove(func);
/* Setup slot structure with entry for empty slot */
func = pciehp_slot_create(p_slot->bus);
if (func == NULL)
return 1; /* Out of memory */
func->bus = p_slot->bus;
func->device = p_slot->device;
func->function = 0;
func->configured = 0;
func->is_a_board = 1;
/* We have to save the presence info for these slots */
p_slot->hpc_ops->get_adapter_status(p_slot, &(func->presence_save));
p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
func->switch_save = !getstatus? 0x10:0;
}
if (p_slot)
update_slot_info(p_slot);
return rc;
}
int pciehp_disable_slot(struct slot *p_slot)
{
u8 class_code, header_type, BCR;
u8 index = 0;
u8 getstatus = 0;
u32 rc = 0;
int ret = 0;
unsigned int devfn;
struct pci_bus *pci_bus = p_slot->ctrl->pci_dev->subordinate;
struct pci_func *func;
if (!p_slot->ctrl)
return 1;
/* Check to see if (latch closed, card present, power on) */
down(&p_slot->ctrl->crit_sect);
if (!HP_SUPR_RM(p_slot->ctrl->ctrlcap)) {
ret = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
if (ret || !getstatus) {
info("%s: no adapter on slot(%x)\n", __FUNCTION__, p_slot->number);
up(&p_slot->ctrl->crit_sect);
return 1;
}
}
if (MRL_SENS(p_slot->ctrl->ctrlcap)) {
ret = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
if (ret || getstatus) {
info("%s: latch open on slot(%x)\n", __FUNCTION__, p_slot->number);
up(&p_slot->ctrl->crit_sect);
return 1;
}
}
if (POWER_CTRL(p_slot->ctrl->ctrlcap)) {
ret = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
if (ret || !getstatus) {
info("%s: already disabled slot(%x)\n", __FUNCTION__, p_slot->number);
up(&p_slot->ctrl->crit_sect);
return 1;
}
}
up(&p_slot->ctrl->crit_sect);
func = pciehp_slot_find(p_slot->bus, p_slot->device, index++);
/* Make sure there are no video controllers here
* for all func of p_slot
*/
while (func && !rc) {
pci_bus->number = func->bus;
devfn = PCI_DEVFN(func->device, func->function);
/* Check the Class Code */
rc = pci_bus_read_config_byte (pci_bus, devfn, 0x0B, &class_code);
if (rc)
return rc;
if (class_code == PCI_BASE_CLASS_DISPLAY) {
/* Display/Video adapter (not supported) */
rc = REMOVE_NOT_SUPPORTED;
} else {
/* See if it's a bridge */
rc = pci_bus_read_config_byte (pci_bus, devfn, PCI_HEADER_TYPE, &header_type);
if (rc)
return rc;
/* If it's a bridge, check the VGA Enable bit */
if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE) {
rc = pci_bus_read_config_byte (pci_bus, devfn, PCI_BRIDGE_CONTROL, &BCR);
if (rc)
return rc;
/* If the VGA Enable bit is set, remove isn't supported */
if (BCR & PCI_BRIDGE_CTL_VGA) {
rc = REMOVE_NOT_SUPPORTED;
}
}
}
func = pciehp_slot_find(p_slot->bus, p_slot->device, index++);
}
func = pciehp_slot_find(p_slot->bus, p_slot->device, 0);
if ((func != NULL) && !rc) {
rc = remove_board(func, p_slot->ctrl);
} else if (!rc)
rc = 1;
if (p_slot)
update_slot_info(p_slot);
return rc;
}