[mirror_ubuntu-zesty-kernel.git] / drivers / pci / hotplug / rpaphp_core.c

/*
 * 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/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 rpaphp_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 128

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

module_param_named(debug, rpaphp_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 enum pci_bus_speed get_max_bus_speed(struct slot *slot)
{
	enum pci_bus_speed speed;
	switch (slot->type) {
	case 1:
	case 2:
	case 3:
	case 4:
	case 5:
	case 6:
		speed = PCI_SPEED_33MHz;	/* speed for case 1-6 */
		break;
	case 7:
	case 8:
		speed = PCI_SPEED_66MHz;
		break;
	case 11:
	case 14:
		speed = PCI_SPEED_66MHz_PCIX;
		break;
	case 12:
	case 15:
		speed = PCI_SPEED_100MHz_PCIX;
		break;
	case 13:
	case 16:
		speed = PCI_SPEED_133MHz_PCIX;
		break;
	default:
		speed = PCI_SPEED_UNKNOWN;
		break;
	}

	return speed;
}

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;
	}

	slot->bus->max_bus_speed = get_max_bus_speed(slot);
	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 = {
	.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,
};

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);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform.
	3	* Copyright (C) 2003 Linda Xie <lxie@us.ibm.com>
	4	*
	5	* All rights reserved.
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or (at
	10	* your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful, but
	13	* WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
	15	* NON INFRINGEMENT. See the GNU General Public License for more
	16	* details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	21	*
	22	* Send feedback to <lxie@us.ibm.com>
	23	*
	24	*/
1da177e4 LT	25	#include <linux/kernel.h>
	26	#include <linux/module.h>
	27	#include <linux/moduleparam.h>
	28	#include <linux/pci.h>
7a54f25c	29	#include <linux/pci_hotplug.h>
1da177e4	30	#include <linux/smp.h>
1da177e4 LT	31	#include <linux/init.h>
	32	#include <asm/eeh.h> /* for eeh_add_device() */
	33	#include <asm/rtas.h> /* rtas_call */
	34	#include <asm/pci-bridge.h> /* for pci_controller */
	35	#include "../pci.h" /* for pci_add_new_bus */
	36	/* and pci_do_scan_bus */
	37	#include "rpaphp.h"
1da177e4	38
5d9bc1fa	39	int rpaphp_debug;
1da177e4	40	LIST_HEAD(rpaphp_slot_head);
1da177e4 LT	41
	42	#define DRIVER_VERSION "0.1"
	43	#define DRIVER_AUTHOR "Linda Xie <lxie@us.ibm.com>"
	44	#define DRIVER_DESC "RPA HOT Plug PCI Controller Driver"
	45
	46	#define MAX_LOC_CODE 128
	47
	48	MODULE_AUTHOR(DRIVER_AUTHOR);
	49	MODULE_DESCRIPTION(DRIVER_DESC);
	50	MODULE_LICENSE("GPL");
	51
5d9bc1fa	52	module_param_named(debug, rpaphp_debug, bool, 0644);
1da177e4	53
1da177e4 LT	54	/**
1da177e4 LT	55	* set_attention_status - set attention LED
26e6c66e RD	56	* @hotplug_slot: target &hotplug_slot
	57	* @value: LED control value
	58	*
1da177e4 LT	59	* echo 0 > attention -- set LED OFF
	60	* echo 1 > attention -- set LED ON
	61	* echo 2 > attention -- set LED ID(identify, light is blinking)
1da177e4 LT	62	*/
	63	static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 value)
	64	{
c02929c2	65	int rc;
1da177e4 LT	66	struct slot slot = (struct slot )hotplug_slot->private;
1da177e4 LT	67
1da177e4 LT	68	switch (value) {
1da177e4 LT	69	case 0:
1da177e4	70	case 1:
1da177e4	71	case 2:
c02929c2 LV	72	break;
	73	default:
	74	value = 1;
1da177e4 LT	75	break;
1da177e4 LT	76	}
c02929c2 LV	77
	78	rc = rtas_set_indicator(DR_INDICATOR, slot->index, value);
	79	if (!rc)
	80	hotplug_slot->info->attention_status = value;
	81
	82	return rc;
1da177e4 LT	83	}
	84
	85	/**
	86	* get_power_status - get power status of a slot
	87	* @hotplug_slot: slot to get status
	88	* @value: pointer to store status
1da177e4 LT	89	*/
	90	static int get_power_status(struct hotplug_slot hotplug_slot, u8 value)
	91	{
427310ff	92	int retval, level;
1da177e4 LT	93	struct slot slot = (struct slot )hotplug_slot->private;
1da177e4 LT	94
427310ff LV	95	retval = rtas_get_power_level (slot->power_domain, &level);
	96	if (!retval)
	97	*value = level;
1da177e4 LT	98	return retval;
	99	}
	100
	101	/**
	102	* get_attention_status - get attention LED status
26e6c66e RD	103	* @hotplug_slot: slot to get status
26e6c66e RD	104	* @value: pointer to store status
1da177e4 LT	105	*/
	106	static int get_attention_status(struct hotplug_slot hotplug_slot, u8 value)
	107	{
1da177e4	108	struct slot slot = (struct slot )hotplug_slot->private;
ebf42c0e LV	109	*value = slot->hotplug_slot->info->attention_status;
ebf42c0e LV	110	return 0;
1da177e4 LT	111	}
	112
	113	static int get_adapter_status(struct hotplug_slot hotplug_slot, u8 value)
	114	{
	115	struct slot slot = (struct slot )hotplug_slot->private;
bf0af511	116	int rc, state;
1da177e4	117
bf0af511	118	rc = rpaphp_get_sensor_state(slot, &state);
bf0af511 LV	119
	120	*value = NOT_VALID;
	121	if (rc)
	122	return rc;
	123
	124	if (state == EMPTY)
	125	*value = EMPTY;
	126	else if (state == PRESENT)
	127	*value = slot->state;
	128
	129	return 0;
1da177e4 LT	130	}
1da177e4 LT	131
3749c51a	132	static enum pci_bus_speed get_max_bus_speed(struct slot *slot)
1da177e4	133	{
3749c51a	134	enum pci_bus_speed speed;
1da177e4 LT	135	switch (slot->type) {
	136	case 1:
	137	case 2:
	138	case 3:
	139	case 4:
	140	case 5:
	141	case 6:
3749c51a	142	speed = PCI_SPEED_33MHz; /* speed for case 1-6 */
1da177e4 LT	143	break;
	144	case 7:
	145	case 8:
3749c51a	146	speed = PCI_SPEED_66MHz;
1da177e4 LT	147	break;
	148	case 11:
	149	case 14:
3749c51a	150	speed = PCI_SPEED_66MHz_PCIX;
1da177e4 LT	151	break;
	152	case 12:
	153	case 15:
3749c51a	154	speed = PCI_SPEED_100MHz_PCIX;
1da177e4 LT	155	break;
	156	case 13:
	157	case 16:
3749c51a	158	speed = PCI_SPEED_133MHz_PCIX;
1da177e4 LT	159	break;
1da177e4 LT	160	default:
3749c51a	161	speed = PCI_SPEED_UNKNOWN;
1da177e4	162	break;
1da177e4	163	}
3749c51a MW	164
3749c51a MW	165	return speed;
1da177e4 LT	166	}
1da177e4 LT	167
954a46e2 JK	168	static int get_children_props(struct device_node dn, const int *drc_indexes,
	169	const int drc_names, const int drc_types,
	170	const int **drc_power_domains)
1da177e4	171	{
954a46e2	172	const int indexes, names, types, domains;
1da177e4	173
40cd3a45 SR	174	indexes = of_get_property(dn, "ibm,drc-indexes", NULL);
	175	names = of_get_property(dn, "ibm,drc-names", NULL);
	176	types = of_get_property(dn, "ibm,drc-types", NULL);
	177	domains = of_get_property(dn, "ibm,drc-power-domains", NULL);
1da177e4 LT	178
	179	if (!indexes \|\| !names \|\| !types \|\| !domains) {
	180	/* Slot does not have dynamically-removable children */
	181	return -EINVAL;
	182	}
	183	if (drc_indexes)
	184	*drc_indexes = indexes;
	185	if (drc_names)
	186	/* &drc_names[1] contains NULL terminated slot names */
	187	*drc_names = names;
	188	if (drc_types)
	189	/* &drc_types[1] contains NULL terminated slot types */
	190	*drc_types = types;
	191	if (drc_power_domains)
	192	*drc_power_domains = domains;
	193
	194	return 0;
	195	}
	196
	197	/* To get the DRC props describing the current node, first obtain it's
	198	* my-drc-index property. Next obtain the DRC list from it's parent. Use
	199	* the my-drc-index for correlation, and obtain the requested properties.
	200	*/
	201	int rpaphp_get_drc_props(struct device_node dn, int drc_index,
	202	char drc_name, char drc_type, int *drc_power_domain)
	203	{
954a46e2 JK	204	const int indexes, names;
	205	const int types, domains;
	206	const unsigned int *my_index;
1da177e4 LT	207	char name_tmp, type_tmp;
	208	int i, rc;
	209
40cd3a45	210	my_index = of_get_property(dn, "ibm,my-drc-index", NULL);
1da177e4 LT	211	if (!my_index) {
	212	/* Node isn't DLPAR/hotplug capable */
	213	return -EINVAL;
	214	}
	215
	216	rc = get_children_props(dn->parent, &indexes, &names, &types, &domains);
	217	if (rc < 0) {
	218	return -EINVAL;
	219	}
	220
	221	name_tmp = (char *) &names[1];
	222	type_tmp = (char *) &types[1];
	223
	224	/* Iterate through parent properties, looking for my-drc-index */
	225	for (i = 0; i < indexes[0]; i++) {
	226	if ((unsigned int) indexes[i + 1] == *my_index) {
	227	if (drc_name)
	228	*drc_name = name_tmp;
	229	if (drc_type)
	230	*drc_type = type_tmp;
	231	if (drc_index)
	232	drc_index = my_index;
	233	if (drc_power_domain)
	234	*drc_power_domain = domains[i+1];
	235	return 0;
	236	}
	237	name_tmp += (strlen(name_tmp) + 1);
	238	type_tmp += (strlen(type_tmp) + 1);
	239	}
	240
	241	return -EINVAL;
	242	}
	243
	244	static int is_php_type(char *drc_type)
	245	{
	246	unsigned long value;
	247	char *endptr;
	248
	249	/* PCI Hotplug nodes have an integer for drc_type */
	250	value = simple_strtoul(drc_type, &endptr, 10);
	251	if (endptr == drc_type)
	252	return 0;
	253
	254	return 1;
	255	}
	256
da65944b LV	257	/**
da65944b LV	258	* is_php_dn() - return 1 if this is a hotpluggable pci slot, else 0
26e6c66e RD	259	* @dn: target &device_node
	260	* @indexes: passed to get_children_props()
	261	* @names: passed to get_children_props()
	262	* @types: returned from get_children_props()
	263	* @power_domains:
da65944b LV	264	*
	265	* This routine will return true only if the device node is
	266	* a hotpluggable slot. This routine will return false
	267	* for built-in pci slots (even when the built-in slots are
	268	* dlparable.)
	269	*/
954a46e2 JK	270	static int is_php_dn(struct device_node dn, const int *indexes,
954a46e2 JK	271	const int names, const int types, const int **power_domains)
1da177e4	272	{
954a46e2	273	const int *drc_types;
1da177e4 LT	274	int rc;
	275
	276	rc = get_children_props(dn, indexes, names, &drc_types, power_domains);
da65944b LV	277	if (rc < 0)
da65944b LV	278	return 0;
1da177e4	279
da65944b LV	280	if (!is_php_type((char *) &drc_types[1]))
	281	return 0;
	282
	283	*types = drc_types;
	284	return 1;
1da177e4 LT	285	}
1da177e4 LT	286
f6afbad8	287	/**
da65944b	288	* rpaphp_add_slot -- declare a hotplug slot to the hotplug subsystem.
26e6c66e	289	* @dn: device node of slot
da65944b LV	290	*
	291	* This subroutine will register a hotplugable slot with the
	292	* PCI hotplug infrastructure. This routine is typicaly called
	293	* during boot time, if the hotplug slots are present at boot time,
	294	* or is called later, by the dlpar add code, if the slot is
	295	* being dynamically added during runtime.
	296	*
	297	* If the device node points at an embedded (built-in) slot, this
	298	* routine will just return without doing anything, since embedded
	299	* slots cannot be hotplugged.
f6afbad8	300	*
26e6c66e	301	* To remove a slot, it suffices to call rpaphp_deregister_slot().
f6afbad8	302	*/
1da177e4 LT	303	int rpaphp_add_slot(struct device_node *dn)
	304	{
	305	struct slot *slot;
	306	int retval = 0;
56d8456b	307	int i;
954a46e2	308	const int indexes, names, types, power_domains;
1da177e4 LT	309	char name, type;
1da177e4 LT	310
bf8cbae4 LV	311	if (!dn->name \|\| strcmp(dn->name, "pci"))
	312	return 0;
	313
da65944b	314	/* If this is not a hotplug slot, return without doing anything. */
bf8cbae4 LV	315	if (!is_php_dn(dn, &indexes, &names, &types, &power_domains))
	316	return 0;
	317
66bef8c0	318	dbg("Entry %s: dn->full_name=%s\n", __func__, dn->full_name);
1da177e4	319
1da177e4	320	/* register PCI devices */
bf8cbae4 LV	321	name = (char *) &names[1];
	322	type = (char *) &types[1];
	323	for (i = 0; i < indexes[0]; i++) {
	324
	325	slot = alloc_slot_struct(dn, indexes[i + 1], name, power_domains[i + 1]);
	326	if (!slot)
	327	return -ENOMEM;
	328
	329	slot->type = simple_strtoul(type, NULL, 10);
1da177e4	330
bf8cbae4 LV	331	dbg("Found drc-index:0x%x drc-name:%s drc-type:%s\n",
bf8cbae4 LV	332	indexes[i + 1], name, type);
1da177e4	333
fea54b8c	334	retval = rpaphp_enable_slot(slot);
6f79eb74 LV	335	if (!retval)
	336	retval = rpaphp_register_slot(slot);
	337
31be7586 LV	338	if (retval)
	339	dealloc_slot_struct(slot);
	340
bf8cbae4 LV	341	name += strlen(name) + 1;
bf8cbae4 LV	342	type += strlen(type) + 1;
1da177e4	343	}
66bef8c0	344	dbg("%s - Exit: rc[%d]\n", __func__, retval);
31be7586 LV	345
31be7586 LV	346	/* XXX FIXME: reports a failure only if last entry in loop failed */
1da177e4 LT	347	return retval;
	348	}
	349
1da177e4 LT	350	static void __exit cleanup_slots(void)
	351	{
	352	struct list_head tmp, n;
	353	struct slot *slot;
	354
	355	/*
	356	* Unregister all of our slots with the pci_hotplug subsystem,
	357	* and free up all memory that we had allocated.
	358	* memory will be freed in release_slot callback.
	359	*/
	360
	361	list_for_each_safe(tmp, n, &rpaphp_slot_head) {
	362	slot = list_entry(tmp, struct slot, rpaphp_slot_list);
	363	list_del(&slot->rpaphp_slot_list);
	364	pci_hp_deregister(slot->hotplug_slot);
	365	}
	366	return;
	367	}
	368
	369	static int __init rpaphp_init(void)
	370	{
5eeb8c63 JR	371	struct device_node *dn = NULL;
5eeb8c63 JR	372
1da177e4	373	info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
5eeb8c63	374
a57ed79e	375	while ((dn = of_find_node_by_name(dn, "pci")))
5eeb8c63 JR	376	rpaphp_add_slot(dn);
5eeb8c63 JR	377
5eeb8c63	378	return 0;
1da177e4 LT	379	}
	380
	381	static void __exit rpaphp_exit(void)
	382	{
	383	cleanup_slots();
	384	}
	385
ac1f0e99	386	static int enable_slot(struct hotplug_slot *hotplug_slot)
1da177e4	387	{
ac1f0e99	388	struct slot slot = (struct slot )hotplug_slot->private;
e06b80b7 LV	389	int state;
e06b80b7 LV	390	int retval;
1da177e4	391
e06b80b7 LV	392	if (slot->state == CONFIGURED)
	393	return 0;
	394
	395	retval = rpaphp_get_sensor_state(slot, &state);
	396	if (retval)
	397	return retval;
	398
	399	if (state == PRESENT) {
	400	pcibios_add_pci_devices(slot->bus);
	401	slot->state = CONFIGURED;
	402	} else if (state == EMPTY) {
	403	slot->state = EMPTY;
	404	} else {
66bef8c0	405	err("%s: slot[%s] is in invalid state\n", __func__, slot->name);
e06b80b7 LV	406	slot->state = NOT_VALID;
e06b80b7 LV	407	return -EINVAL;
1da177e4	408	}
3749c51a MW	409
3749c51a MW	410	slot->bus->max_bus_speed = get_max_bus_speed(slot);
e06b80b7 LV	411	return 0;
	412	}
	413
ac1f0e99	414	static int disable_slot(struct hotplug_slot *hotplug_slot)
e06b80b7	415	{
e06b80b7	416	struct slot slot = (struct slot )hotplug_slot->private;
8fe64399 LV	417	if (slot->state == NOT_CONFIGURED)
8fe64399 LV	418	return -EINVAL;
1da177e4	419
e70ea263	420	pcibios_remove_pci_devices(slot->bus);
8fe64399 LV	421	slot->state = NOT_CONFIGURED;
	422	return 0;
	423	}
	424
b64a71ab	425	struct hotplug_slot_ops rpaphp_hotplug_slot_ops = {
b64a71ab LV	426	.enable_slot = enable_slot,
	427	.disable_slot = disable_slot,
	428	.set_attention_status = set_attention_status,
	429	.get_power_status = get_power_status,
	430	.get_attention_status = get_attention_status,
	431	.get_adapter_status = get_adapter_status,
b64a71ab LV	432	};
b64a71ab LV	433
1da177e4 LT	434	module_init(rpaphp_init);
	435	module_exit(rpaphp_exit);
	436
	437	EXPORT_SYMBOL_GPL(rpaphp_add_slot);
1da177e4 LT	438	EXPORT_SYMBOL_GPL(rpaphp_slot_head);
1da177e4 LT	439	EXPORT_SYMBOL_GPL(rpaphp_get_drc_props);