/* * CompactPCI Hot Plug Driver * * Copyright (C) 2002,2005 SOMA Networks, Inc. * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com) * Copyright (C) 2001 IBM Corp. * * 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 <scottm@somanetworks.com> */ #include <linux/module.h>#include <linux/kernel.h>#include <linux/slab.h>#include <linux/pci.h>#include <linux/pci_hotplug.h>#include <linux/init.h>#include <linux/interrupt.h>#include <linux/smp_lock.h>#include <asm/atomic.h>#include <linux/delay.h>#include "cpci_hotplug.h" #define DRIVER_AUTHOR	"Scott Murray <scottm@somanetworks.com>"#define DRIVER_DESC	"CompactPCI Hot Plug Core" #define MY_NAME	"cpci_hotplug" #define dbg(format, arg...)					\	do {							\		if (cpci_debug)					\			printk (KERN_DEBUG "%s: " format "\n",	\				MY_NAME , ## arg); 		\	} while (0)#define err(format, arg...) printk(KERN_ERR "%s: " format "\n", MY_NAME , ## arg)#define info(format, arg...) printk(KERN_INFO "%s: " format "\n", MY_NAME , ## arg)#define warn(format, arg...) printk(KERN_WARNING "%s: " format "\n", MY_NAME , ## arg) /* local variables */static DECLARE_RWSEM(list_rwsem);static LIST_HEAD(slot_list);static int slots;static atomic_t extracting;int cpci_debug;static struct cpci_hp_controller *controller;static struct semaphore event_semaphore;	/* mutex for process loop (up if something to process) */static struct semaphore thread_exit;		/* guard ensure thread has exited before calling it quits */static int thread_finished = 1; static int enable_slot(struct hotplug_slot *slot);static int disable_slot(struct hotplug_slot *slot);static int set_attention_status(struct hotplug_slot *slot, u8 value);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_adapter_status(struct hotplug_slot *slot, u8 * value);static int get_latch_status(struct hotplug_slot *slot, u8 * value); static struct hotplug_slot_ops cpci_hotplug_slot_ops = {	.owner = THIS_MODULE,	.enable_slot = enable_slot,	.disable_slot = disable_slot,	.set_attention_status = set_attention_status,	.get_power_status = get_power_status,	.get_attention_status = get_attention_status,	.get_adapter_status = get_adapter_status,	.get_latch_status = get_latch_status,}; static intupdate_latch_status(struct hotplug_slot *hotplug_slot, u8 value){	struct hotplug_slot_info info; 	memcpy(&info, hotplug_slot->info, sizeof(struct hotplug_slot_info));	info.latch_status = value;	return pci_hp_change_slot_info(hotplug_slot, &info);} static intupdate_adapter_status(struct hotplug_slot *hotplug_slot, u8 value){	struct hotplug_slot_info info; 	memcpy(&info, hotplug_slot->info, sizeof(struct hotplug_slot_info));	info.adapter_status = value;	return pci_hp_change_slot_info(hotplug_slot, &info);} static intenable_slot(struct hotplug_slot *hotplug_slot){	struct slot *slot = hotplug_slot->private;	int retval = 0; 	dbg("%s - physical_slot = %s", __FUNCTION__, hotplug_slot->name); 	if (controller->ops->set_power)		retval = controller->ops->set_power(slot, 1);	return retval;} static intdisable_slot(struct hotplug_slot *hotplug_slot){	struct slot *slot = hotplug_slot->private;	int retval = 0; 	dbg("%s - physical_slot = %s", __FUNCTION__, hotplug_slot->name); 	down_write(&list_rwsem); 	/* Unconfigure device */	dbg("%s - unconfiguring slot %s",	    __FUNCTION__, slot->hotplug_slot->name);	if ((retval = cpci_unconfigure_slot(slot))) {		err("%s - could not unconfigure slot %s",		    __FUNCTION__, slot->hotplug_slot->name);		goto disable_error;	}	dbg("%s - finished unconfiguring slot %s",	    __FUNCTION__, slot->hotplug_slot->name); 	/* Clear EXT (by setting it) */	if (cpci_clear_ext(slot)) {		err("%s - could not clear EXT for slot %s",		    __FUNCTION__, slot->hotplug_slot->name);		retval = -ENODEV;		goto disable_error;	}	cpci_led_on(slot); 	if (controller->ops->set_power)		if ((retval = controller->ops->set_power(slot, 0)))			goto disable_error; 	if (update_adapter_status(slot->hotplug_slot, 0))		warn("failure to update adapter file"); 	if (slot->extracting) {		slot->extracting = 0;		atomic_dec(&extracting);	}disable_error:	up_write(&list_rwsem);	return retval;} static u8cpci_get_power_status(struct slot *slot){	u8 power = 1; 	if (controller->ops->get_power)		power = controller->ops->get_power(slot);	return power;} static intget_power_status(struct hotplug_slot *hotplug_slot, u8 * value){	struct slot *slot = hotplug_slot->private; 	*value = cpci_get_power_status(slot);	return 0;} static intget_attention_status(struct hotplug_slot *hotplug_slot, u8 * value){	struct slot *slot = hotplug_slot->private; 	*value = cpci_get_attention_status(slot);	return 0;} static intset_attention_status(struct hotplug_slot *hotplug_slot, u8 status){	return cpci_set_attention_status(hotplug_slot->private, status);} static intget_adapter_status(struct hotplug_slot *hotplug_slot, u8 * value){	*value = hotplug_slot->info->adapter_status;	return 0;} static intget_latch_status(struct hotplug_slot *hotplug_slot, u8 * value){	*value = hotplug_slot->info->latch_status;	return 0;} static void release_slot(struct hotplug_slot *hotplug_slot){	struct slot *slot = hotplug_slot->private; 	kfree(slot->hotplug_slot->info);	kfree(slot->hotplug_slot->name);	kfree(slot->hotplug_slot);	if (slot->dev)		pci_dev_put(slot->dev);	kfree(slot);} #define SLOT_NAME_SIZE	6static voidmake_slot_name(struct slot *slot){	snprintf(slot->hotplug_slot->name,		 SLOT_NAME_SIZE, "%02x:%02x", slot->bus->number, slot->number);} intcpci_hp_register_bus(struct pci_bus *bus, u8 first, u8 last){	struct slot *slot;	struct hotplug_slot *hotplug_slot;	struct hotplug_slot_info *info;	char *name;	int status = -ENOMEM;	int i; 	if (!(controller && bus))		return -ENODEV; 	/*	 * Create a structure for each slot, and register that slot	 * with the pci_hotplug subsystem.	 */	for (i = first; i <= last; ++i) {		slot = kzalloc(sizeof (struct slot), GFP_KERNEL);		if (!slot)			goto error; 		hotplug_slot =			kzalloc(sizeof (struct hotplug_slot), GFP_KERNEL);		if (!hotplug_slot)			goto error_slot;		slot->hotplug_slot = hotplug_slot; 		info = kzalloc(sizeof (struct hotplug_slot_info), GFP_KERNEL);		if (!info)			goto error_hpslot;		hotplug_slot->info = info; 		name = kmalloc(SLOT_NAME_SIZE, GFP_KERNEL);		if (!name)			goto error_info;		hotplug_slot->name = name; 		slot->bus = bus;		slot->number = i;		slot->devfn = PCI_DEVFN(i, 0); 		hotplug_slot->private = slot;		hotplug_slot->release = &release_slot;		make_slot_name(slot);		hotplug_slot->ops = &cpci_hotplug_slot_ops; 		/*		 * Initialize the slot info structure with some known		 * good values.		 */		dbg("initializing slot %s", slot->hotplug_slot->name);		info->power_status = cpci_get_power_status(slot);		info->attention_status = cpci_get_attention_status(slot); 		dbg("registering slot %s", slot->hotplug_slot->name);		status = pci_hp_register(slot->hotplug_slot);		if (status) {			err("pci_hp_register failed with error %d", status);			goto error_name;		} 		/* Add slot to our internal list */		down_write(&list_rwsem);		list_add(&slot->slot_list, &slot_list);		slots++;		up_write(&list_rwsem);	}	return 0;error_name:	kfree(name);error_info:	kfree(info);error_hpslot:	kfree(hotplug_slot);error_slot:	kfree(slot);error:	return status;} intcpci_hp_unregister_bus(struct pci_bus *bus){	struct slot *slot;	struct slot *tmp;	int status = 0; 	down_write(&list_rwsem);	if (!slots) {		up_write(&list_rwsem);		return -1;	}	list_for_each_entry_safe(slot, tmp, &slot_list, slot_list) {		if (slot->bus == bus) {			list_del(&slot->slot_list);			slots--; 			dbg("deregistering slot %s", slot->hotplug_slot->name);			status = pci_hp_deregister(slot->hotplug_slot);			if (status) {				err("pci_hp_deregister failed with error %d",				    status);				break;			}		}	}	up_write(&list_rwsem);	return status;} /* This is the interrupt mode interrupt handler */static irqreturn_tcpci_hp_intr(int irq, void *data){	dbg("entered cpci_hp_intr"); 	/* Check to see if it was our interrupt */	if ((controller->irq_flags & IRQF_SHARED) &&	    !controller->ops->check_irq(controller->dev_id)) {		dbg("exited cpci_hp_intr, not our interrupt");		return IRQ_NONE;	} 	/* Disable ENUM interrupt */	controller->ops->disable_irq(); 	/* Trigger processing by the event thread */	dbg("Signal event_semaphore");	up(&event_semaphore);	dbg("exited cpci_hp_intr");	return IRQ_HANDLED;} /* * According to PICMG 2.1 R2.0, section 6.3.2, upon * initialization, the system driver shall clear the * INS bits of the cold-inserted devices. */static intinit_slots(int clear_ins){	struct slot *slot;	struct pci_dev* dev; 	dbg("%s - enter", __FUNCTION__);	down_read(&list_rwsem);	if (!slots) {		up_read(&list_rwsem);		return -1;	}	list_for_each_entry(slot, &slot_list, slot_list) {		dbg("%s - looking at slot %s",		    __FUNCTION__, slot->hotplug_slot->name);		if (clear_ins && cpci_check_and_clear_ins(slot))			dbg("%s - cleared INS for slot %s",			    __FUNCTION__, slot->hotplug_slot->name);		dev = pci_get_slot(slot->bus, PCI_DEVFN(slot->number, 0));		if (dev) {			if (update_adapter_status(slot->hotplug_slot, 1))				warn("failure to update adapter file");			if (update_latch_status(slot->hotplug_slot, 1))				warn("failure to update latch file");			slot->dev = dev;		}	}	up_read(&list_rwsem);	dbg("%s - exit", __FUNCTION__);	return 0;} static intcheck_slots(void){	struct slot *slot;	int extracted;	int inserted;	u16 hs_csr; 	down_read(&list_rwsem);	if (!slots) {		up_read(&list_rwsem);		err("no slots registered, shutting down");		return -1;	}	extracted = inserted = 0;	list_for_each_entry(slot, &slot_list, slot_list) {		dbg("%s - looking at slot %s",		    __FUNCTION__, slot->hotplug_slot->name);		if (cpci_check_and_clear_ins(slot)) {			/*			 * Some broken hardware (e.g. PLX 9054AB) asserts			 * ENUM# twice...			 */			if (slot->dev) {				warn("slot %s already inserted",				     slot->hotplug_slot->name);				inserted++;				continue;			} 			/* Process insertion */			dbg("%s - slot %s inserted",			    __FUNCTION__, slot->hotplug_slot->name); 			/* GSM, debug */			hs_csr = cpci_get_hs_csr(slot);			dbg("%s - slot %s HS_CSR (1) = %04x",			    __FUNCTION__, slot->hotplug_slot->name, hs_csr); 			/* Configure device */			dbg("%s - configuring slot %s",			    __FUNCTION__, slot->hotplug_slot->name);			if (cpci_configure_slot(slot)) {				err("%s - could not configure slot %s",				    __FUNCTION__, slot->hotplug_slot->name);				continue;			}			dbg("%s - finished configuring slot %s",			    __FUNCTION__, slot->hotplug_slot->name); 			/* GSM, debug */			hs_csr = cpci_get_hs_csr(slot);			dbg("%s - slot %s HS_CSR (2) = %04x",			    __FUNCTION__, slot->hotplug_slot->name, hs_csr); 			if (update_latch_status(slot->hotplug_slot, 1))				warn("failure to update latch file"); 			if (update_adapter_status(slot->hotplug_slot, 1))				warn("failure to update adapter file"); 			cpci_led_off(slot); 			/* GSM, debug */			hs_csr = cpci_get_hs_csr(slot);			dbg("%s - slot %s HS_CSR (3) = %04x",			    __FUNCTION__, slot->hotplug_slot->name, hs_csr); 			inserted++;		} else if (cpci_check_ext(slot)) {			/* Process extraction request */			dbg("%s - slot %s extracted",			    __FUNCTION__, slot->hotplug_slot->name); 			/* GSM, debug */			hs_csr = cpci_get_hs_csr(slot);			dbg("%s - slot %s HS_CSR = %04x",			    __FUNCTION__, slot->hotplug_slot->name, hs_csr); 			if (!slot->extracting) {				if (update_latch_status(slot->hotplug_slot, 0)) {					warn("failure to update latch file");				}				slot->extracting = 1;				atomic_inc(&extracting);			}			extracted++;		} else if (slot->extracting) {			hs_csr = cpci_get_hs_csr(slot);			if (hs_csr == 0xffff) {				/*				 * Hmmm, we're likely hosed at this point, should we				 * bother trying to tell the driver or not?				 */				err("card in slot %s was improperly removed",				    slot->hotplug_slot->name);				if (update_adapter_status(slot->hotplug_slot, 0))					warn("failure to update adapter file");

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