516 строки
13 KiB
C
516 строки
13 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/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/types.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/pci.h>
|
|
#include "../pci.h"
|
|
#include "pciehp.h"
|
|
|
|
static void interrupt_event_handler(struct work_struct *work);
|
|
|
|
void pciehp_queue_interrupt_event(struct slot *p_slot, u32 event_type)
|
|
{
|
|
struct event_info *info;
|
|
|
|
info = kmalloc(sizeof(*info), GFP_ATOMIC);
|
|
if (!info) {
|
|
ctrl_err(p_slot->ctrl, "dropped event %d (ENOMEM)\n", event_type);
|
|
return;
|
|
}
|
|
|
|
INIT_WORK(&info->work, interrupt_event_handler);
|
|
info->event_type = event_type;
|
|
info->p_slot = p_slot;
|
|
queue_work(p_slot->wq, &info->work);
|
|
}
|
|
|
|
/* The following routines constitute the bulk of the
|
|
hotplug controller logic
|
|
*/
|
|
|
|
static void set_slot_off(struct controller *ctrl, struct slot *pslot)
|
|
{
|
|
/* turn off slot, turn on Amber LED, turn off Green LED if supported*/
|
|
if (POWER_CTRL(ctrl)) {
|
|
pciehp_power_off_slot(pslot);
|
|
|
|
/*
|
|
* After turning power off, we must wait for at least 1 second
|
|
* before taking any action that relies on power having been
|
|
* removed from the slot/adapter.
|
|
*/
|
|
msleep(1000);
|
|
}
|
|
|
|
pciehp_green_led_off(pslot);
|
|
pciehp_set_attention_status(pslot, 1);
|
|
}
|
|
|
|
/**
|
|
* board_added - Called after a board has been added to the system.
|
|
* @p_slot: &slot where board is added
|
|
*
|
|
* Turns power on for the board.
|
|
* Configures board.
|
|
*/
|
|
static int board_added(struct slot *p_slot)
|
|
{
|
|
int retval = 0;
|
|
struct controller *ctrl = p_slot->ctrl;
|
|
struct pci_bus *parent = ctrl->pcie->port->subordinate;
|
|
|
|
if (POWER_CTRL(ctrl)) {
|
|
/* Power on slot */
|
|
retval = pciehp_power_on_slot(p_slot);
|
|
if (retval)
|
|
return retval;
|
|
}
|
|
|
|
pciehp_green_led_blink(p_slot);
|
|
|
|
/* Check link training status */
|
|
retval = pciehp_check_link_status(ctrl);
|
|
if (retval) {
|
|
ctrl_err(ctrl, "Failed to check link status\n");
|
|
goto err_exit;
|
|
}
|
|
|
|
/* Check for a power fault */
|
|
if (ctrl->power_fault_detected || pciehp_query_power_fault(p_slot)) {
|
|
ctrl_err(ctrl, "Slot(%s): Power fault\n", slot_name(p_slot));
|
|
retval = -EIO;
|
|
goto err_exit;
|
|
}
|
|
|
|
retval = pciehp_configure_device(p_slot);
|
|
if (retval) {
|
|
ctrl_err(ctrl, "Cannot add device at %04x:%02x:00\n",
|
|
pci_domain_nr(parent), parent->number);
|
|
if (retval != -EEXIST)
|
|
goto err_exit;
|
|
}
|
|
|
|
pciehp_green_led_on(p_slot);
|
|
pciehp_set_attention_status(p_slot, 0);
|
|
return 0;
|
|
|
|
err_exit:
|
|
set_slot_off(ctrl, p_slot);
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* remove_board - Turns off slot and LEDs
|
|
* @p_slot: slot where board is being removed
|
|
*/
|
|
static int remove_board(struct slot *p_slot)
|
|
{
|
|
int retval;
|
|
struct controller *ctrl = p_slot->ctrl;
|
|
|
|
retval = pciehp_unconfigure_device(p_slot);
|
|
if (retval)
|
|
return retval;
|
|
|
|
if (POWER_CTRL(ctrl)) {
|
|
pciehp_power_off_slot(p_slot);
|
|
|
|
/*
|
|
* After turning power off, we must wait for at least 1 second
|
|
* before taking any action that relies on power having been
|
|
* removed from the slot/adapter.
|
|
*/
|
|
msleep(1000);
|
|
}
|
|
|
|
/* turn off Green LED */
|
|
pciehp_green_led_off(p_slot);
|
|
return 0;
|
|
}
|
|
|
|
struct power_work_info {
|
|
struct slot *p_slot;
|
|
struct work_struct work;
|
|
unsigned int req;
|
|
#define DISABLE_REQ 0
|
|
#define ENABLE_REQ 1
|
|
};
|
|
|
|
/**
|
|
* pciehp_power_thread - handle pushbutton events
|
|
* @work: &struct work_struct describing work to be done
|
|
*
|
|
* Scheduled procedure to handle blocking stuff for the pushbuttons.
|
|
* Handles all pending events and exits.
|
|
*/
|
|
static void pciehp_power_thread(struct work_struct *work)
|
|
{
|
|
struct power_work_info *info =
|
|
container_of(work, struct power_work_info, work);
|
|
struct slot *p_slot = info->p_slot;
|
|
int ret;
|
|
|
|
switch (info->req) {
|
|
case DISABLE_REQ:
|
|
mutex_lock(&p_slot->hotplug_lock);
|
|
pciehp_disable_slot(p_slot);
|
|
mutex_unlock(&p_slot->hotplug_lock);
|
|
mutex_lock(&p_slot->lock);
|
|
p_slot->state = STATIC_STATE;
|
|
mutex_unlock(&p_slot->lock);
|
|
break;
|
|
case ENABLE_REQ:
|
|
mutex_lock(&p_slot->hotplug_lock);
|
|
ret = pciehp_enable_slot(p_slot);
|
|
mutex_unlock(&p_slot->hotplug_lock);
|
|
if (ret)
|
|
pciehp_green_led_off(p_slot);
|
|
mutex_lock(&p_slot->lock);
|
|
p_slot->state = STATIC_STATE;
|
|
mutex_unlock(&p_slot->lock);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
kfree(info);
|
|
}
|
|
|
|
static void pciehp_queue_power_work(struct slot *p_slot, int req)
|
|
{
|
|
struct power_work_info *info;
|
|
|
|
p_slot->state = (req == ENABLE_REQ) ? POWERON_STATE : POWEROFF_STATE;
|
|
|
|
info = kmalloc(sizeof(*info), GFP_KERNEL);
|
|
if (!info) {
|
|
ctrl_err(p_slot->ctrl, "no memory to queue %s request\n",
|
|
(req == ENABLE_REQ) ? "poweron" : "poweroff");
|
|
return;
|
|
}
|
|
info->p_slot = p_slot;
|
|
INIT_WORK(&info->work, pciehp_power_thread);
|
|
info->req = req;
|
|
queue_work(p_slot->wq, &info->work);
|
|
}
|
|
|
|
void pciehp_queue_pushbutton_work(struct work_struct *work)
|
|
{
|
|
struct slot *p_slot = container_of(work, struct slot, work.work);
|
|
|
|
mutex_lock(&p_slot->lock);
|
|
switch (p_slot->state) {
|
|
case BLINKINGOFF_STATE:
|
|
pciehp_queue_power_work(p_slot, DISABLE_REQ);
|
|
break;
|
|
case BLINKINGON_STATE:
|
|
pciehp_queue_power_work(p_slot, ENABLE_REQ);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
mutex_unlock(&p_slot->lock);
|
|
}
|
|
|
|
/*
|
|
* Note: This function must be called with slot->lock held
|
|
*/
|
|
static void handle_button_press_event(struct slot *p_slot)
|
|
{
|
|
struct controller *ctrl = p_slot->ctrl;
|
|
u8 getstatus;
|
|
|
|
switch (p_slot->state) {
|
|
case STATIC_STATE:
|
|
pciehp_get_power_status(p_slot, &getstatus);
|
|
if (getstatus) {
|
|
p_slot->state = BLINKINGOFF_STATE;
|
|
ctrl_info(ctrl, "Slot(%s): Powering off due to button press\n",
|
|
slot_name(p_slot));
|
|
} else {
|
|
p_slot->state = BLINKINGON_STATE;
|
|
ctrl_info(ctrl, "Slot(%s) Powering on due to button press\n",
|
|
slot_name(p_slot));
|
|
}
|
|
/* blink green LED and turn off amber */
|
|
pciehp_green_led_blink(p_slot);
|
|
pciehp_set_attention_status(p_slot, 0);
|
|
queue_delayed_work(p_slot->wq, &p_slot->work, 5*HZ);
|
|
break;
|
|
case BLINKINGOFF_STATE:
|
|
case BLINKINGON_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
|
|
*/
|
|
ctrl_info(ctrl, "Slot(%s): Button cancel\n", slot_name(p_slot));
|
|
cancel_delayed_work(&p_slot->work);
|
|
if (p_slot->state == BLINKINGOFF_STATE)
|
|
pciehp_green_led_on(p_slot);
|
|
else
|
|
pciehp_green_led_off(p_slot);
|
|
pciehp_set_attention_status(p_slot, 0);
|
|
ctrl_info(ctrl, "Slot(%s): Action canceled due to button press\n",
|
|
slot_name(p_slot));
|
|
p_slot->state = STATIC_STATE;
|
|
break;
|
|
case POWEROFF_STATE:
|
|
case POWERON_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
|
|
*/
|
|
ctrl_info(ctrl, "Slot(%s): Button ignored\n",
|
|
slot_name(p_slot));
|
|
break;
|
|
default:
|
|
ctrl_err(ctrl, "Slot(%s): Ignoring invalid state %#x\n",
|
|
slot_name(p_slot), p_slot->state);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Note: This function must be called with slot->lock held
|
|
*/
|
|
static void handle_link_event(struct slot *p_slot, u32 event)
|
|
{
|
|
struct controller *ctrl = p_slot->ctrl;
|
|
|
|
switch (p_slot->state) {
|
|
case BLINKINGON_STATE:
|
|
case BLINKINGOFF_STATE:
|
|
cancel_delayed_work(&p_slot->work);
|
|
/* Fall through */
|
|
case STATIC_STATE:
|
|
pciehp_queue_power_work(p_slot, event == INT_LINK_UP ?
|
|
ENABLE_REQ : DISABLE_REQ);
|
|
break;
|
|
case POWERON_STATE:
|
|
if (event == INT_LINK_UP) {
|
|
ctrl_info(ctrl, "Slot(%s): Link Up event ignored; already powering on\n",
|
|
slot_name(p_slot));
|
|
} else {
|
|
ctrl_info(ctrl, "Slot(%s): Link Down event queued; currently getting powered on\n",
|
|
slot_name(p_slot));
|
|
pciehp_queue_power_work(p_slot, DISABLE_REQ);
|
|
}
|
|
break;
|
|
case POWEROFF_STATE:
|
|
if (event == INT_LINK_UP) {
|
|
ctrl_info(ctrl, "Slot(%s): Link Up event queued; currently getting powered off\n",
|
|
slot_name(p_slot));
|
|
pciehp_queue_power_work(p_slot, ENABLE_REQ);
|
|
} else {
|
|
ctrl_info(ctrl, "Slot(%s): Link Down event ignored; already powering off\n",
|
|
slot_name(p_slot));
|
|
}
|
|
break;
|
|
default:
|
|
ctrl_err(ctrl, "Slot(%s): Ignoring invalid state %#x\n",
|
|
slot_name(p_slot), p_slot->state);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void interrupt_event_handler(struct work_struct *work)
|
|
{
|
|
struct event_info *info = container_of(work, struct event_info, work);
|
|
struct slot *p_slot = info->p_slot;
|
|
struct controller *ctrl = p_slot->ctrl;
|
|
|
|
mutex_lock(&p_slot->lock);
|
|
switch (info->event_type) {
|
|
case INT_BUTTON_PRESS:
|
|
handle_button_press_event(p_slot);
|
|
break;
|
|
case INT_POWER_FAULT:
|
|
if (!POWER_CTRL(ctrl))
|
|
break;
|
|
pciehp_set_attention_status(p_slot, 1);
|
|
pciehp_green_led_off(p_slot);
|
|
break;
|
|
case INT_PRESENCE_ON:
|
|
pciehp_queue_power_work(p_slot, ENABLE_REQ);
|
|
break;
|
|
case INT_PRESENCE_OFF:
|
|
/*
|
|
* Regardless of surprise capability, we need to
|
|
* definitely remove a card that has been pulled out!
|
|
*/
|
|
pciehp_queue_power_work(p_slot, DISABLE_REQ);
|
|
break;
|
|
case INT_LINK_UP:
|
|
case INT_LINK_DOWN:
|
|
handle_link_event(p_slot, info->event_type);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
mutex_unlock(&p_slot->lock);
|
|
|
|
kfree(info);
|
|
}
|
|
|
|
/*
|
|
* Note: This function must be called with slot->hotplug_lock held
|
|
*/
|
|
int pciehp_enable_slot(struct slot *p_slot)
|
|
{
|
|
u8 getstatus = 0;
|
|
struct controller *ctrl = p_slot->ctrl;
|
|
|
|
pciehp_get_adapter_status(p_slot, &getstatus);
|
|
if (!getstatus) {
|
|
ctrl_info(ctrl, "Slot(%s): No adapter\n", slot_name(p_slot));
|
|
return -ENODEV;
|
|
}
|
|
if (MRL_SENS(p_slot->ctrl)) {
|
|
pciehp_get_latch_status(p_slot, &getstatus);
|
|
if (getstatus) {
|
|
ctrl_info(ctrl, "Slot(%s): Latch open\n",
|
|
slot_name(p_slot));
|
|
return -ENODEV;
|
|
}
|
|
}
|
|
|
|
if (POWER_CTRL(p_slot->ctrl)) {
|
|
pciehp_get_power_status(p_slot, &getstatus);
|
|
if (getstatus) {
|
|
ctrl_info(ctrl, "Slot(%s): Already enabled\n",
|
|
slot_name(p_slot));
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return board_added(p_slot);
|
|
}
|
|
|
|
/*
|
|
* Note: This function must be called with slot->hotplug_lock held
|
|
*/
|
|
int pciehp_disable_slot(struct slot *p_slot)
|
|
{
|
|
u8 getstatus = 0;
|
|
struct controller *ctrl = p_slot->ctrl;
|
|
|
|
if (!p_slot->ctrl)
|
|
return 1;
|
|
|
|
if (POWER_CTRL(p_slot->ctrl)) {
|
|
pciehp_get_power_status(p_slot, &getstatus);
|
|
if (!getstatus) {
|
|
ctrl_info(ctrl, "Slot(%s): Already disabled\n",
|
|
slot_name(p_slot));
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
return remove_board(p_slot);
|
|
}
|
|
|
|
int pciehp_sysfs_enable_slot(struct slot *p_slot)
|
|
{
|
|
int retval = -ENODEV;
|
|
struct controller *ctrl = p_slot->ctrl;
|
|
|
|
mutex_lock(&p_slot->lock);
|
|
switch (p_slot->state) {
|
|
case BLINKINGON_STATE:
|
|
cancel_delayed_work(&p_slot->work);
|
|
case STATIC_STATE:
|
|
p_slot->state = POWERON_STATE;
|
|
mutex_unlock(&p_slot->lock);
|
|
mutex_lock(&p_slot->hotplug_lock);
|
|
retval = pciehp_enable_slot(p_slot);
|
|
mutex_unlock(&p_slot->hotplug_lock);
|
|
mutex_lock(&p_slot->lock);
|
|
p_slot->state = STATIC_STATE;
|
|
break;
|
|
case POWERON_STATE:
|
|
ctrl_info(ctrl, "Slot(%s): Already in powering on state\n",
|
|
slot_name(p_slot));
|
|
break;
|
|
case BLINKINGOFF_STATE:
|
|
case POWEROFF_STATE:
|
|
ctrl_info(ctrl, "Slot(%s): Already enabled\n",
|
|
slot_name(p_slot));
|
|
break;
|
|
default:
|
|
ctrl_err(ctrl, "Slot(%s): Invalid state %#x\n",
|
|
slot_name(p_slot), p_slot->state);
|
|
break;
|
|
}
|
|
mutex_unlock(&p_slot->lock);
|
|
|
|
return retval;
|
|
}
|
|
|
|
int pciehp_sysfs_disable_slot(struct slot *p_slot)
|
|
{
|
|
int retval = -ENODEV;
|
|
struct controller *ctrl = p_slot->ctrl;
|
|
|
|
mutex_lock(&p_slot->lock);
|
|
switch (p_slot->state) {
|
|
case BLINKINGOFF_STATE:
|
|
cancel_delayed_work(&p_slot->work);
|
|
case STATIC_STATE:
|
|
p_slot->state = POWEROFF_STATE;
|
|
mutex_unlock(&p_slot->lock);
|
|
mutex_lock(&p_slot->hotplug_lock);
|
|
retval = pciehp_disable_slot(p_slot);
|
|
mutex_unlock(&p_slot->hotplug_lock);
|
|
mutex_lock(&p_slot->lock);
|
|
p_slot->state = STATIC_STATE;
|
|
break;
|
|
case POWEROFF_STATE:
|
|
ctrl_info(ctrl, "Slot(%s): Already in powering off state\n",
|
|
slot_name(p_slot));
|
|
break;
|
|
case BLINKINGON_STATE:
|
|
case POWERON_STATE:
|
|
ctrl_info(ctrl, "Slot(%s): Already disabled\n",
|
|
slot_name(p_slot));
|
|
break;
|
|
default:
|
|
ctrl_err(ctrl, "Slot(%s): Invalid state %#x\n",
|
|
slot_name(p_slot), p_slot->state);
|
|
break;
|
|
}
|
|
mutex_unlock(&p_slot->lock);
|
|
|
|
return retval;
|
|
}
|