/* * 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/moduleparam.h>#include <linux/kernel.h>#include <linux/types.h>#include <linux/pci.h>#include "pciehp.h"#include <linux/interrupt.h>/* Global variables */int pciehp_debug;int pciehp_poll_mode;int pciehp_poll_time;int pciehp_force;struct controller *pciehp_ctrl_list;#define DRIVER_VERSION	"0.4"#define DRIVER_AUTHOR	"Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>"#define DRIVER_DESC	"PCI Express Hot Plug Controller Driver"MODULE_AUTHOR(DRIVER_AUTHOR);MODULE_DESCRIPTION(DRIVER_DESC);MODULE_LICENSE("GPL");module_param(pciehp_debug, bool, 0644);module_param(pciehp_poll_mode, bool, 0644);module_param(pciehp_poll_time, int, 0644);module_param(pciehp_force, bool, 0644);MODULE_PARM_DESC(pciehp_debug, "Debugging mode enabled or not");MODULE_PARM_DESC(pciehp_poll_mode, "Using polling mechanism for hot-plug events or not");MODULE_PARM_DESC(pciehp_poll_time, "Polling mechanism frequency, in seconds");MODULE_PARM_DESC(pciehp_force, "Force pciehp, even if _OSC and OSHP are missing");#define PCIE_MODULE_NAME "pciehp"static int pcie_start_thread (void);static int set_attention_status (struct hotplug_slot *slot, u8 value);static int enable_slot		(struct hotplug_slot *slot);static int disable_slot		(struct hotplug_slot *slot);static int get_power_status	(struct hotplug_slot *slot, u8 *value);static int get_attention_status	(struct hotplug_slot *slot, u8 *value);static int get_latch_status	(struct hotplug_slot *slot, u8 *value);static int get_adapter_status	(struct hotplug_slot *slot, u8 *value);static int get_max_bus_speed	(struct hotplug_slot *slot, enum pci_bus_speed *value);static int get_cur_bus_speed	(struct hotplug_slot *slot, enum pci_bus_speed *value);static struct hotplug_slot_ops pciehp_hotplug_slot_ops = {	.owner =		THIS_MODULE,	.set_attention_status =	set_attention_status,	.enable_slot =		enable_slot,	.disable_slot =		disable_slot,	.get_power_status =	get_power_status,	.get_attention_status =	get_attention_status,	.get_latch_status =	get_latch_status,	.get_adapter_status =	get_adapter_status,  	.get_max_bus_speed =	get_max_bus_speed,  	.get_cur_bus_speed =	get_cur_bus_speed,};/** * release_slot - free up the memory used by a slot * @hotplug_slot: slot to free */static void release_slot(struct hotplug_slot *hotplug_slot){	struct slot *slot = hotplug_slot->private;	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);	kfree(slot->hotplug_slot->info);	kfree(slot->hotplug_slot->name);	kfree(slot->hotplug_slot);	kfree(slot);}static int init_slots(struct controller *ctrl){	struct slot *slot;	struct hpc_ops *hpc_ops;	struct hotplug_slot *hotplug_slot;	struct hotplug_slot_info *hotplug_slot_info;	u8 number_of_slots;	u8 slot_device;	u32 slot_number;	int result = -ENOMEM;	number_of_slots = ctrl->num_slots;	slot_device = ctrl->slot_device_offset;	slot_number = ctrl->first_slot;	while (number_of_slots) {		slot = kzalloc(sizeof(*slot), GFP_KERNEL);		if (!slot)			goto error;		slot->hotplug_slot =				kzalloc(sizeof(*(slot->hotplug_slot)),						GFP_KERNEL);		if (!slot->hotplug_slot)			goto error_slot;		hotplug_slot = slot->hotplug_slot;		hotplug_slot->info =			kzalloc(sizeof(*(hotplug_slot->info)),						GFP_KERNEL);		if (!hotplug_slot->info)			goto error_hpslot;		hotplug_slot_info = hotplug_slot->info;		hotplug_slot->name = kmalloc(SLOT_NAME_SIZE, GFP_KERNEL);		if (!hotplug_slot->name)			goto error_info;		slot->ctrl = ctrl;		slot->bus = ctrl->slot_bus;		slot->device = slot_device;		slot->hpc_ops = hpc_ops = ctrl->hpc_ops;		slot->number = ctrl->first_slot;		slot->hp_slot = slot_device - ctrl->slot_device_offset;		/* register this slot with the hotplug pci core */		hotplug_slot->private = slot;		hotplug_slot->release = &release_slot;		make_slot_name(hotplug_slot->name, SLOT_NAME_SIZE, slot);		hotplug_slot->ops = &pciehp_hotplug_slot_ops;		hpc_ops->get_power_status(slot,			&(hotplug_slot_info->power_status));		hpc_ops->get_attention_status(slot,			&(hotplug_slot_info->attention_status));		hpc_ops->get_latch_status(slot,			&(hotplug_slot_info->latch_status));		hpc_ops->get_adapter_status(slot,			&(hotplug_slot_info->adapter_status));		dbg("Registering bus=%x dev=%x hp_slot=%x sun=%x "			"slot_device_offset=%x\n",			slot->bus, slot->device, slot->hp_slot, slot->number,			ctrl->slot_device_offset);		result = pci_hp_register(hotplug_slot);		if (result) {			err ("pci_hp_register failed with error %d\n", result);			goto error_name;		}		slot->next = ctrl->slot;		ctrl->slot = slot;		number_of_slots--;		slot_device++;		slot_number += ctrl->slot_num_inc;	}	return 0;error_name:	kfree(hotplug_slot->name);error_info:	kfree(hotplug_slot_info);error_hpslot:	kfree(hotplug_slot);error_slot:	kfree(slot);error:	return result;}static int cleanup_slots (struct controller * ctrl){	struct slot *old_slot, *next_slot;	old_slot = ctrl->slot;	ctrl->slot = NULL;	while (old_slot) {		next_slot = old_slot->next;		pci_hp_deregister (old_slot->hotplug_slot);		old_slot = next_slot;	}	return(0);}static int get_ctlr_slot_config(struct controller *ctrl){	int num_ctlr_slots;		/* Not needed; PCI Express has 1 slot per port*/	int first_device_num;		/* Not needed */	int physical_slot_num;	u8 ctrlcap;				int rc;	rc = pcie_get_ctlr_slot_config(ctrl, &num_ctlr_slots, &first_device_num, &physical_slot_num, &ctrlcap);	if (rc) {		err("%s: get_ctlr_slot_config fail for b:d (%x:%x)\n", __FUNCTION__, ctrl->bus, ctrl->device);		return (-1);	}	ctrl->num_slots = num_ctlr_slots;	/* PCI Express has 1 slot per port */	ctrl->slot_device_offset = first_device_num;	ctrl->first_slot = physical_slot_num;	ctrl->ctrlcap = ctrlcap; 		dbg("%s: bus(0x%x) num_slot(0x%x) 1st_dev(0x%x) psn(0x%x) ctrlcap(%x) for b:d (%x:%x)\n",		__FUNCTION__, ctrl->slot_bus, num_ctlr_slots, first_device_num, physical_slot_num, ctrlcap, 		ctrl->bus, ctrl->device);	return (0);}/* * set_attention_status - Turns the Amber LED for a slot on, off or blink */static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status){	struct slot *slot = hotplug_slot->private;	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);	hotplug_slot->info->attention_status = status;		if (ATTN_LED(slot->ctrl->ctrlcap)) 		slot->hpc_ops->set_attention_status(slot, status);	return 0;}static int enable_slot(struct hotplug_slot *hotplug_slot){	struct slot *slot = hotplug_slot->private;	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);	return pciehp_enable_slot(slot);}static int disable_slot(struct hotplug_slot *hotplug_slot){	struct slot *slot = hotplug_slot->private;	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);	return pciehp_disable_slot(slot);}static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value){	struct slot *slot = hotplug_slot->private;	int retval;	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);	retval = slot->hpc_ops->get_power_status(slot, value);	if (retval < 0)		*value = hotplug_slot->info->power_status;	return 0;}static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value){	struct slot *slot = hotplug_slot->private;	int retval;	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);	retval = slot->hpc_ops->get_attention_status(slot, value);	if (retval < 0)		*value = hotplug_slot->info->attention_status;	return 0;}static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value){	struct slot *slot = hotplug_slot->private;	int retval;	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);	retval = slot->hpc_ops->get_latch_status(slot, value);	if (retval < 0)		*value = hotplug_slot->info->latch_status;	return 0;}static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value){	struct slot *slot = hotplug_slot->private;	int retval;	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);	retval = slot->hpc_ops->get_adapter_status(slot, value);	if (retval < 0)		*value = hotplug_slot->info->adapter_status;	return 0;}static int get_max_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value){	struct slot *slot = hotplug_slot->private;	int retval;	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);		retval = slot->hpc_ops->get_max_bus_speed(slot, value);	if (retval < 0)		*value = PCI_SPEED_UNKNOWN;	return 0;}static int get_cur_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value){	struct slot *slot = hotplug_slot->private;	int retval;	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);		retval = slot->hpc_ops->get_cur_bus_speed(slot, value);	if (retval < 0)		*value = PCI_SPEED_UNKNOWN;	return 0;}static int pciehp_probe(struct pcie_device *dev, const struct pcie_port_service_id *id){	int rc;	struct controller *ctrl;	struct slot *t_slot;	int first_device_num = 0 ;	/* first PCI device number supported by this PCIE */  	int num_ctlr_slots;		/* number of slots supported by this HPC */	u8 value;	struct pci_dev *pdev;		ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);	if (!ctrl) {		err("%s : out of memory\n", __FUNCTION__);		goto err_out_none;	}	pdev = dev->port;	ctrl->pci_dev = pdev;	rc = pcie_init(ctrl, dev);	if (rc) {		dbg("%s: controller initialization failed\n", PCIE_MODULE_NAME);		goto err_out_free_ctrl;	}	pci_set_drvdata(pdev, ctrl);	ctrl->pci_bus = kmalloc(sizeof(*ctrl->pci_bus), GFP_KERNEL);	if (!ctrl->pci_bus) {		err("%s: out of memory\n", __FUNCTION__);		rc = -ENOMEM;		goto err_out_unmap_mmio_region;	}	memcpy (ctrl->pci_bus, pdev->bus, sizeof (*ctrl->pci_bus));	ctrl->bus = pdev->bus->number;  /* ctrl bus */	ctrl->slot_bus = pdev->subordinate->number;  /* bus controlled by this HPC */	ctrl->device = PCI_SLOT(pdev->devfn);	ctrl->function = PCI_FUNC(pdev->devfn);	dbg("%s: ctrl bus=0x%x, device=%x, function=%x, irq=%x\n", __FUNCTION__,		ctrl->bus, ctrl->device, ctrl->function, pdev->irq);	/*	 *	Save configuration headers for this and subordinate PCI buses	 */	rc = get_ctlr_slot_config(ctrl);	if (rc) {		err(msg_initialization_err, rc);		goto err_out_free_ctrl_bus;	}	first_device_num = ctrl->slot_device_offset;	num_ctlr_slots = ctrl->num_slots; 	/* Setup the slot information structures */	rc = init_slots(ctrl);	if (rc) {		err(msg_initialization_err, 6);		goto err_out_free_ctrl_slot;	}	t_slot = pciehp_find_slot(ctrl, first_device_num);	/*	Finish setting up the hot plug ctrl device */	ctrl->next_event = 0;	if (!pciehp_ctrl_list) {		pciehp_ctrl_list = ctrl;		ctrl->next = NULL;	} else {		ctrl->next = pciehp_ctrl_list;		pciehp_ctrl_list = ctrl;	}	/* Wait for exclusive access to hardware */	mutex_lock(&ctrl->crit_sect);	t_slot->hpc_ops->get_adapter_status(t_slot, &value); /* Check if slot is occupied */		if ((POWER_CTRL(ctrl->ctrlcap)) && !value) {		rc = t_slot->hpc_ops->power_off_slot(t_slot); /* Power off slot if not occupied*/		if (rc) {			/* Done with exclusive hardware access */			mutex_unlock(&ctrl->crit_sect);			goto err_out_free_ctrl_slot;		} else			/* Wait for the command to complete */			wait_for_ctrl_irq (ctrl);	}	/* Done with exclusive hardware access */	mutex_unlock(&ctrl->crit_sect);	return 0;err_out_free_ctrl_slot:	cleanup_slots(ctrl);err_out_free_ctrl_bus:	kfree(ctrl->pci_bus);err_out_unmap_mmio_region:	ctrl->hpc_ops->release_ctlr(ctrl);err_out_free_ctrl:	kfree(ctrl);err_out_none:	return -ENODEV;}static int pcie_start_thread(void){	int retval = 0;		dbg("Initialize + Start the notification/polling mechanism \n");	retval = pciehp_event_start_thread();	if (retval) {		dbg("pciehp_event_start_thread() failed\n");		return retval;	}	return retval;}static void __exit unload_pciehpd(void){	struct controller *ctrl;	struct controller *tctrl;	ctrl = pciehp_ctrl_list;	while (ctrl) {		cleanup_slots(ctrl);		kfree (ctrl->pci_bus);		ctrl->hpc_ops->release_ctlr(ctrl);		tctrl = ctrl;		ctrl = ctrl->next;		kfree(tctrl);	}	/* Stop the notification mechanism */	pciehp_event_stop_thread();}static int hpdriver_context = 0;static void pciehp_remove (struct pcie_device *device){	printk("%s ENTRY\n", __FUNCTION__);		printk("%s -> Call free_irq for irq = %d\n",  		__FUNCTION__, device->irq);	free_irq(device->irq, &hpdriver_context);}#ifdef CONFIG_PMstatic int pciehp_suspend (struct pcie_device *dev, pm_message_t state){	printk("%s ENTRY\n", __FUNCTION__);		return 0;}static int pciehp_resume (struct pcie_device *dev){	printk("%s ENTRY\n", __FUNCTION__);		return 0;}#endifstatic struct pcie_port_service_id port_pci_ids[] = { { 	.vendor = PCI_ANY_ID, 	.device = PCI_ANY_ID,	.port_type = PCIE_ANY_PORT,	.service_type = PCIE_PORT_SERVICE_HP,	.driver_data =	0, 	}, { /* end: all zeroes */ }};static const char device_name[] = "hpdriver";static struct pcie_port_service_driver hpdriver_portdrv = {	.name		= (char *)device_name,	.id_table	= &port_pci_ids[0],	.probe		= pciehp_probe,	.remove		= pciehp_remove,#ifdef	CONFIG_PM	.suspend	= pciehp_suspend,	.resume		= pciehp_resume,#endif	/* PM */};static int __init pcied_init(void){	int retval = 0;#ifdef CONFIG_HOTPLUG_PCI_PCIE_POLL_EVENT_MODE	pciehp_poll_mode = 1;#endif	retval = pcie_start_thread();	if (retval)		goto error_hpc_init;	retval = pcie_port_service_register(&hpdriver_portdrv); 	dbg("pcie_port_service_register = %d\n", retval);  	info(DRIVER_DESC " version: " DRIVER_VERSION "\n"); 	if (retval)		dbg("%s: Failure to register service\n", __FUNCTION__);error_hpc_init:	if (retval) {		pciehp_event_stop_thread();	};	return retval;}static void __exit pcied_cleanup(void){	dbg("unload_pciehpd()\n");	unload_pciehpd();	pcie_port_service_unregister(&hpdriver_portdrv);	info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");}module_init(pcied_init);module_exit(pcied_cleanup);