/* * PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform. * Copyright (C) 2003 Linda Xie <lxie@us.ibm.com> * * 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 <lxie@us.ibm.com> * */#include <linux/kernel.h>#include <linux/module.h>#include <linux/moduleparam.h>#include <linux/pci.h>#include <linux/pci_hotplug.h>#include <linux/slab.h>#include <linux/smp.h>#include <linux/init.h>#include <asm/eeh.h>       /* for eeh_add_device() */#include <asm/rtas.h>		/* rtas_call */#include <asm/pci-bridge.h>	/* for pci_controller */#include "../pci.h"		/* for pci_add_new_bus */				/* and pci_do_scan_bus */#include "rpaphp.h"int debug;LIST_HEAD(rpaphp_slot_head);#define DRIVER_VERSION	"0.1"#define DRIVER_AUTHOR	"Linda Xie <lxie@us.ibm.com>"#define DRIVER_DESC	"RPA HOT Plug PCI Controller Driver"#define MAX_LOC_CODE 128MODULE_AUTHOR(DRIVER_AUTHOR);MODULE_DESCRIPTION(DRIVER_DESC);MODULE_LICENSE("GPL");module_param(debug, bool, 0644);/** * set_attention_status - set attention LED * @hotplug_slot: target &hotplug_slot * @value: LED control value * * echo 0 > attention -- set LED OFF * echo 1 > attention -- set LED ON * echo 2 > attention -- set LED ID(identify, light is blinking) */static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 value){	int rc;	struct slot *slot = (struct slot *)hotplug_slot->private;	switch (value) {	case 0:	case 1:	case 2:		break;	default:		value = 1;		break;	}	rc = rtas_set_indicator(DR_INDICATOR, slot->index, value);	if (!rc)		hotplug_slot->info->attention_status = value;	return rc;}/** * get_power_status - get power status of a slot * @hotplug_slot: slot to get status * @value: pointer to store status */static int get_power_status(struct hotplug_slot *hotplug_slot, u8 * value){	int retval, level;	struct slot *slot = (struct slot *)hotplug_slot->private;	retval = rtas_get_power_level (slot->power_domain, &level);	if (!retval)		*value = level;	return retval;}/** * get_attention_status - get attention LED status * @hotplug_slot: slot to get status * @value: pointer to store status */static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 * value){	struct slot *slot = (struct slot *)hotplug_slot->private;	*value = slot->hotplug_slot->info->attention_status;	return 0;}static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 * value){	struct slot *slot = (struct slot *)hotplug_slot->private;	int rc, state;	rc = rpaphp_get_sensor_state(slot, &state);	*value = NOT_VALID;	if (rc)		return rc;	if (state == EMPTY)		*value = EMPTY;	else if (state == PRESENT)		*value = slot->state;	return 0;}static int get_max_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value){	struct slot *slot = (struct slot *)hotplug_slot->private;	switch (slot->type) {	case 1:	case 2:	case 3:	case 4:	case 5:	case 6:		*value = PCI_SPEED_33MHz;	/* speed for case 1-6 */		break;	case 7:	case 8:		*value = PCI_SPEED_66MHz;		break;	case 11:	case 14:		*value = PCI_SPEED_66MHz_PCIX;		break;	case 12:	case 15:		*value = PCI_SPEED_100MHz_PCIX;		break;	case 13:	case 16:		*value = PCI_SPEED_133MHz_PCIX;		break;	default:		*value = PCI_SPEED_UNKNOWN;		break;	}	return 0;}static int get_children_props(struct device_node *dn, const int **drc_indexes,		const int **drc_names, const int **drc_types,		const int **drc_power_domains){	const int *indexes, *names, *types, *domains;	indexes = of_get_property(dn, "ibm,drc-indexes", NULL);	names = of_get_property(dn, "ibm,drc-names", NULL);	types = of_get_property(dn, "ibm,drc-types", NULL);	domains = of_get_property(dn, "ibm,drc-power-domains", NULL);	if (!indexes || !names || !types || !domains) {		/* Slot does not have dynamically-removable children */		return -EINVAL;	}	if (drc_indexes)		*drc_indexes = indexes;	if (drc_names)		/* &drc_names[1] contains NULL terminated slot names */		*drc_names = names;	if (drc_types)		/* &drc_types[1] contains NULL terminated slot types */		*drc_types = types;	if (drc_power_domains)		*drc_power_domains = domains;	return 0;}/* To get the DRC props describing the current node, first obtain it's * my-drc-index property.  Next obtain the DRC list from it's parent.  Use * the my-drc-index for correlation, and obtain the requested properties. */int rpaphp_get_drc_props(struct device_node *dn, int *drc_index,		char **drc_name, char **drc_type, int *drc_power_domain){	const int *indexes, *names;	const int *types, *domains;	const unsigned int *my_index;	char *name_tmp, *type_tmp;	int i, rc;	my_index = of_get_property(dn, "ibm,my-drc-index", NULL);	if (!my_index) {		/* Node isn't DLPAR/hotplug capable */		return -EINVAL;	}	rc = get_children_props(dn->parent, &indexes, &names, &types, &domains);	if (rc < 0) {		return -EINVAL;	}	name_tmp = (char *) &names[1];	type_tmp = (char *) &types[1];	/* Iterate through parent properties, looking for my-drc-index */	for (i = 0; i < indexes[0]; i++) {		if ((unsigned int) indexes[i + 1] == *my_index) {			if (drc_name)                		*drc_name = name_tmp;			if (drc_type)				*drc_type = type_tmp;			if (drc_index)				*drc_index = *my_index;			if (drc_power_domain)				*drc_power_domain = domains[i+1];			return 0;		}		name_tmp += (strlen(name_tmp) + 1);		type_tmp += (strlen(type_tmp) + 1);	}	return -EINVAL;}static int is_php_type(char *drc_type){	unsigned long value;	char *endptr;	/* PCI Hotplug nodes have an integer for drc_type */	value = simple_strtoul(drc_type, &endptr, 10);	if (endptr == drc_type)		return 0;	return 1;}/** * is_php_dn() - return 1 if this is a hotpluggable pci slot, else 0 * @dn: target &device_node * @indexes: passed to get_children_props() * @names: passed to get_children_props() * @types: returned from get_children_props() * @power_domains: * * This routine will return true only if the device node is * a hotpluggable slot. This routine will return false * for built-in pci slots (even when the built-in slots are * dlparable.) */static int is_php_dn(struct device_node *dn, const int **indexes,		const int **names, const int **types, const int **power_domains){	const int *drc_types;	int rc;	rc = get_children_props(dn, indexes, names, &drc_types, power_domains);	if (rc < 0)		return 0;	if (!is_php_type((char *) &drc_types[1]))		return 0;	*types = drc_types;	return 1;}/** * rpaphp_add_slot -- declare a hotplug slot to the hotplug subsystem. * @dn: device node of slot * * This subroutine will register a hotplugable slot with the * PCI hotplug infrastructure. This routine is typicaly called * during boot time, if the hotplug slots are present at boot time, * or is called later, by the dlpar add code, if the slot is * being dynamically added during runtime. * * If the device node points at an embedded (built-in) slot, this * routine will just return without doing anything, since embedded * slots cannot be hotplugged. * * To remove a slot, it suffices to call rpaphp_deregister_slot(). */int rpaphp_add_slot(struct device_node *dn){	struct slot *slot;	int retval = 0;	int i;	const int *indexes, *names, *types, *power_domains;	char *name, *type;	if (!dn->name || strcmp(dn->name, "pci"))		return 0;	/* If this is not a hotplug slot, return without doing anything. */	if (!is_php_dn(dn, &indexes, &names, &types, &power_domains))		return 0;	dbg("Entry %s: dn->full_name=%s\n", __func__, dn->full_name);	/* register PCI devices */	name = (char *) &names[1];	type = (char *) &types[1];	for (i = 0; i < indexes[0]; i++) {		slot = alloc_slot_struct(dn, indexes[i + 1], name, power_domains[i + 1]);		if (!slot)			return -ENOMEM;		slot->type = simple_strtoul(type, NULL, 10);						dbg("Found drc-index:0x%x drc-name:%s drc-type:%s\n",				indexes[i + 1], name, type);		retval = rpaphp_enable_slot(slot);		if (!retval)			retval = rpaphp_register_slot(slot);		if (retval)			dealloc_slot_struct(slot);		name += strlen(name) + 1;		type += strlen(type) + 1;	}	dbg("%s - Exit: rc[%d]\n", __func__, retval);	/* XXX FIXME: reports a failure only if last entry in loop failed */	return retval;}static void __exit cleanup_slots(void){	struct list_head *tmp, *n;	struct slot *slot;	/*	 * Unregister all of our slots with the pci_hotplug subsystem,	 * and free up all memory that we had allocated.	 * memory will be freed in release_slot callback. 	 */	list_for_each_safe(tmp, n, &rpaphp_slot_head) {		slot = list_entry(tmp, struct slot, rpaphp_slot_list);		list_del(&slot->rpaphp_slot_list);		pci_hp_deregister(slot->hotplug_slot);	}	return;}static int __init rpaphp_init(void){	struct device_node *dn = NULL;	info(DRIVER_DESC " version: " DRIVER_VERSION "\n");	while ((dn = of_find_node_by_name(dn, "pci")))		rpaphp_add_slot(dn);	return 0;}static void __exit rpaphp_exit(void){	cleanup_slots();}static int enable_slot(struct hotplug_slot *hotplug_slot){	struct slot *slot = (struct slot *)hotplug_slot->private;	int state;	int retval;	if (slot->state == CONFIGURED)		return 0;	retval = rpaphp_get_sensor_state(slot, &state);	if (retval)		return retval;	if (state == PRESENT) {		pcibios_add_pci_devices(slot->bus);		slot->state = CONFIGURED;	} else if (state == EMPTY) {		slot->state = EMPTY;	} else {		err("%s: slot[%s] is in invalid state\n", __func__, slot->name);		slot->state = NOT_VALID;		return -EINVAL;	}	return 0;}static int disable_slot(struct hotplug_slot *hotplug_slot){	struct slot *slot = (struct slot *)hotplug_slot->private;	if (slot->state == NOT_CONFIGURED)		return -EINVAL;	pcibios_remove_pci_devices(slot->bus);	slot->state = NOT_CONFIGURED;	return 0;}struct hotplug_slot_ops rpaphp_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_max_bus_speed = get_max_bus_speed,};module_init(rpaphp_init);module_exit(rpaphp_exit);EXPORT_SYMBOL_GPL(rpaphp_add_slot);EXPORT_SYMBOL_GPL(rpaphp_slot_head);EXPORT_SYMBOL_GPL(rpaphp_get_drc_props);