Initial import

1 files changed, 692 insertions, 0 deletions

diff --git a/drivers/pci/hotplug/pciehp_ctrl.c b/drivers/pci/hotplug/pciehp_ctrl.c
new file mode 100644
index 000000000..f052e951b
--- /dev/null
+++ b/drivers/pci/hotplug/pciehp_ctrl.c
@@ -0,0 +1,692 @@
+/*
+ * 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);
+
+static int queue_interrupt_event(struct slot *p_slot, u32 event_type)
+{
+	struct event_info *info;
+
+	info = kmalloc(sizeof(*info), GFP_ATOMIC);
+	if (!info)
+		return -ENOMEM;
+
+	info->event_type = event_type;
+	info->p_slot = p_slot;
+	INIT_WORK(&info->work, interrupt_event_handler);
+
+	queue_work(p_slot->wq, &info->work);
+
+	return 0;
+}
+
+u8 pciehp_handle_attention_button(struct slot *p_slot)
+{
+	u32 event_type;
+	struct controller *ctrl = p_slot->ctrl;
+
+	/* Attention Button Change */
+	ctrl_dbg(ctrl, "Attention button interrupt received\n");
+
+	/*
+	 *  Button pressed - See if need to TAKE ACTION!!!
+	 */
+	ctrl_info(ctrl, "Button pressed on Slot(%s)\n", slot_name(p_slot));
+	event_type = INT_BUTTON_PRESS;
+
+	queue_interrupt_event(p_slot, event_type);
+
+	return 0;
+}
+
+u8 pciehp_handle_switch_change(struct slot *p_slot)
+{
+	u8 getstatus;
+	u32 event_type;
+	struct controller *ctrl = p_slot->ctrl;
+
+	/* Switch Change */
+	ctrl_dbg(ctrl, "Switch interrupt received\n");
+
+	pciehp_get_latch_status(p_slot, &getstatus);
+	if (getstatus) {
+		/*
+		 * Switch opened
+		 */
+		ctrl_info(ctrl, "Latch open on Slot(%s)\n", slot_name(p_slot));
+		event_type = INT_SWITCH_OPEN;
+	} else {
+		/*
+		 *  Switch closed
+		 */
+		ctrl_info(ctrl, "Latch close on Slot(%s)\n", slot_name(p_slot));
+		event_type = INT_SWITCH_CLOSE;
+	}
+
+	queue_interrupt_event(p_slot, event_type);
+
+	return 1;
+}
+
+u8 pciehp_handle_presence_change(struct slot *p_slot)
+{
+	u32 event_type;
+	u8 presence_save;
+	struct controller *ctrl = p_slot->ctrl;
+
+	/* Presence Change */
+	ctrl_dbg(ctrl, "Presence/Notify input change\n");
+
+	/* Switch is open, assume a presence change
+	 * Save the presence state
+	 */
+	pciehp_get_adapter_status(p_slot, &presence_save);
+	if (presence_save) {
+		/*
+		 * Card Present
+		 */
+		ctrl_info(ctrl, "Card present on Slot(%s)\n", slot_name(p_slot));
+		event_type = INT_PRESENCE_ON;
+	} else {
+		/*
+		 * Not Present
+		 */
+		ctrl_info(ctrl, "Card not present on Slot(%s)\n",
+			  slot_name(p_slot));
+		event_type = INT_PRESENCE_OFF;
+	}
+
+	queue_interrupt_event(p_slot, event_type);
+
+	return 1;
+}
+
+u8 pciehp_handle_power_fault(struct slot *p_slot)
+{
+	u32 event_type;
+	struct controller *ctrl = p_slot->ctrl;
+
+	/* power fault */
+	ctrl_dbg(ctrl, "Power fault interrupt received\n");
+	ctrl_err(ctrl, "Power fault on slot %s\n", slot_name(p_slot));
+	event_type = INT_POWER_FAULT;
+	ctrl_info(ctrl, "Power fault bit %x set\n", 0);
+	queue_interrupt_event(p_slot, event_type);
+
+	return 1;
+}
+
+void pciehp_handle_linkstate_change(struct slot *p_slot)
+{
+	u32 event_type;
+	struct controller *ctrl = p_slot->ctrl;
+
+	/* Link Status Change */
+	ctrl_dbg(ctrl, "Data Link Layer State change\n");
+
+	if (pciehp_check_link_active(ctrl)) {
+		ctrl_info(ctrl, "slot(%s): Link Up event\n",
+			  slot_name(p_slot));
+		event_type = INT_LINK_UP;
+	} else {
+		ctrl_info(ctrl, "slot(%s): Link Down event\n",
+			  slot_name(p_slot));
+		event_type = INT_LINK_DOWN;
+	}
+
+	queue_interrupt_event(p_slot, event_type);
+}
+
+/* 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, "Power fault on slot %s\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);
+	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:
+		ctrl_dbg(p_slot->ctrl,
+			 "Disabling domain:bus:device=%04x:%02x:00\n",
+			 pci_domain_nr(p_slot->ctrl->pcie->port->subordinate),
+			 p_slot->ctrl->pcie->port->subordinate->number);
+		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:
+		ctrl_dbg(p_slot->ctrl,
+			 "Enabling domain:bus:device=%04x:%02x:00\n",
+			 pci_domain_nr(p_slot->ctrl->pcie->port->subordinate),
+			 p_slot->ctrl->pcie->port->subordinate->number);
+		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);
+}
+
+void pciehp_queue_pushbutton_work(struct work_struct *work)
+{
+	struct slot *p_slot = container_of(work, struct slot, work.work);
+	struct power_work_info *info;
+
+	info = kmalloc(sizeof(*info), GFP_KERNEL);
+	if (!info) {
+		ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
+			 __func__);
+		return;
+	}
+	info->p_slot = p_slot;
+	INIT_WORK(&info->work, pciehp_power_thread);
+
+	mutex_lock(&p_slot->lock);
+	switch (p_slot->state) {
+	case BLINKINGOFF_STATE:
+		p_slot->state = POWEROFF_STATE;
+		info->req = DISABLE_REQ;
+		break;
+	case BLINKINGON_STATE:
+		p_slot->state = POWERON_STATE;
+		info->req = ENABLE_REQ;
+		break;
+	default:
+		kfree(info);
+		goto out;
+	}
+	queue_work(p_slot->wq, &info->work);
+ out:
+	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, "PCI slot #%s - powering off due to button press\n",
+				  slot_name(p_slot));
+		} else {
+			p_slot->state = BLINKINGON_STATE;
+			ctrl_info(ctrl, "PCI 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, "Button cancel on Slot(%s)\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, "PCI 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, "Button ignore on Slot(%s)\n", slot_name(p_slot));
+		break;
+	default:
+		ctrl_warn(ctrl, "Not a valid state\n");
+		break;
+	}
+}
+
+/*
+ * Note: This function must be called with slot->lock held
+ */
+static void handle_surprise_event(struct slot *p_slot)
+{
+	u8 getstatus;
+	struct power_work_info *info;
+
+	info = kmalloc(sizeof(*info), GFP_KERNEL);
+	if (!info) {
+		ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
+			 __func__);
+		return;
+	}
+	info->p_slot = p_slot;
+	INIT_WORK(&info->work, pciehp_power_thread);
+
+	pciehp_get_adapter_status(p_slot, &getstatus);
+	if (!getstatus) {
+		p_slot->state = POWEROFF_STATE;
+		info->req = DISABLE_REQ;
+	} else {
+		p_slot->state = POWERON_STATE;
+		info->req = ENABLE_REQ;
+	}
+
+	queue_work(p_slot->wq, &info->work);
+}
+
+/*
+ * 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;
+	struct power_work_info *info;
+
+	info = kmalloc(sizeof(*info), GFP_KERNEL);
+	if (!info) {
+		ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
+			 __func__);
+		return;
+	}
+	info->p_slot = p_slot;
+	info->req = event == INT_LINK_UP ? ENABLE_REQ : DISABLE_REQ;
+	INIT_WORK(&info->work, pciehp_power_thread);
+
+	switch (p_slot->state) {
+	case BLINKINGON_STATE:
+	case BLINKINGOFF_STATE:
+		cancel_delayed_work(&p_slot->work);
+		/* Fall through */
+	case STATIC_STATE:
+		p_slot->state = event == INT_LINK_UP ?
+		    POWERON_STATE : POWEROFF_STATE;
+		queue_work(p_slot->wq, &info->work);
+		break;
+	case POWERON_STATE:
+		if (event == INT_LINK_UP) {
+			ctrl_info(ctrl,
+				  "Link Up event ignored on slot(%s): already powering on\n",
+				  slot_name(p_slot));
+			kfree(info);
+		} else {
+			ctrl_info(ctrl,
+				  "Link Down event queued on slot(%s): currently getting powered on\n",
+				  slot_name(p_slot));
+			p_slot->state = POWEROFF_STATE;
+			queue_work(p_slot->wq, &info->work);
+		}
+		break;
+	case POWEROFF_STATE:
+		if (event == INT_LINK_UP) {
+			ctrl_info(ctrl,
+				  "Link Up event queued on slot(%s): currently getting powered off\n",
+				  slot_name(p_slot));
+			p_slot->state = POWERON_STATE;
+			queue_work(p_slot->wq, &info->work);
+		} else {
+			ctrl_info(ctrl,
+				  "Link Down event ignored on slot(%s): already powering off\n",
+				  slot_name(p_slot));
+			kfree(info);
+		}
+		break;
+	default:
+		ctrl_err(ctrl, "Not a valid state on slot(%s)\n",
+			 slot_name(p_slot));
+		kfree(info);
+		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:
+		ctrl_dbg(ctrl, "Surprise Insertion\n");
+		handle_surprise_event(p_slot);
+		break;
+	case INT_PRESENCE_OFF:
+		/*
+		 * Regardless of surprise capability, we need to
+		 * definitely remove a card that has been pulled out!
+		 */
+		ctrl_dbg(ctrl, "Surprise Removal\n");
+		handle_surprise_event(p_slot);
+		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;
+	int rc;
+	struct controller *ctrl = p_slot->ctrl;
+
+	pciehp_get_adapter_status(p_slot, &getstatus);
+	if (!getstatus) {
+		ctrl_info(ctrl, "No adapter on slot(%s)\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, "Latch open on slot(%s)\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, "Already enabled on slot(%s)\n",
+				  slot_name(p_slot));
+			return -EINVAL;
+		}
+	}
+
+	pciehp_get_latch_status(p_slot, &getstatus);
+
+	rc = board_added(p_slot);
+	if (rc)
+		pciehp_get_latch_status(p_slot, &getstatus);
+
+	return rc;
+}
+
+/*
+ * 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, "Already disabled on slot(%s)\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 is already in powering on state\n",
+			  slot_name(p_slot));
+		break;
+	case BLINKINGOFF_STATE:
+	case POWEROFF_STATE:
+		ctrl_info(ctrl, "Already enabled on slot %s\n",
+			  slot_name(p_slot));
+		break;
+	default:
+		ctrl_err(ctrl, "Not a valid state on slot %s\n",
+			 slot_name(p_slot));
+		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);
+		retval = pciehp_disable_slot(p_slot);
+		mutex_lock(&p_slot->lock);
+		p_slot->state = STATIC_STATE;
+		break;
+	case POWEROFF_STATE:
+		ctrl_info(ctrl, "Slot %s is already in powering off state\n",
+			  slot_name(p_slot));
+		break;
+	case BLINKINGON_STATE:
+	case POWERON_STATE:
+		ctrl_info(ctrl, "Already disabled on slot %s\n",
+			  slot_name(p_slot));
+		break;
+	default:
+		ctrl_err(ctrl, "Not a valid state on slot %s\n",
+			 slot_name(p_slot));
+		break;
+	}
+	mutex_unlock(&p_slot->lock);
+
+	return retval;
+}