[deliverable/linux.git] / drivers / pci / hotplug / rpaphp_slot.c

/*
 * RPA Virtual I/O device functions 
 * Copyright (C) 2004 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/kobject.h>
#include <linux/sysfs.h>
#include <linux/pci.h>
#include <linux/string.h>
#include <linux/slab.h>

#include <asm/rtas.h>
#include "rpaphp.h"

static ssize_t location_read_file (struct hotplug_slot *php_slot, char *buf)
{
	char *value;
	int retval = -ENOENT;
	struct slot *slot = (struct slot *)php_slot->private;

	if (!slot)
		return retval;

	value = slot->location;
	retval = sprintf (buf, "%s\n", value);
	return retval;
}

static struct hotplug_slot_attribute hotplug_slot_attr_location = {
	.attr = {.name = "phy_location", .mode = S_IFREG | S_IRUGO},
	.show = location_read_file,
};

static void rpaphp_sysfs_add_attr_location (struct hotplug_slot *slot)
{
	sysfs_create_file(&slot->kobj, &hotplug_slot_attr_location.attr);
}

static void rpaphp_sysfs_remove_attr_location (struct hotplug_slot *slot)
{
	sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_location.attr);
}

/* free up the memory used by a slot */
static void rpaphp_release_slot(struct hotplug_slot *hotplug_slot)
{
	struct slot *slot = (struct slot *) hotplug_slot->private;

	dealloc_slot_struct(slot);
}

void dealloc_slot_struct(struct slot *slot)
{
	kfree(slot->hotplug_slot->info);
	kfree(slot->hotplug_slot->name);
	kfree(slot->hotplug_slot);
	kfree(slot);
	return;
}

struct slot *alloc_slot_struct(struct device_node *dn, int drc_index, char *drc_name,
		  int power_domain)
{
	struct slot *slot;
	
	slot = kzalloc(sizeof(struct slot), GFP_KERNEL);
	if (!slot)
		goto error_nomem;
	slot->hotplug_slot = kzalloc(sizeof(struct hotplug_slot), GFP_KERNEL);
	if (!slot->hotplug_slot)
		goto error_slot;	
	slot->hotplug_slot->info = kzalloc(sizeof(struct hotplug_slot_info),
					   GFP_KERNEL);
	if (!slot->hotplug_slot->info)
		goto error_hpslot;
	slot->hotplug_slot->name = kmalloc(BUS_ID_SIZE + 1, GFP_KERNEL);
	if (!slot->hotplug_slot->name)
		goto error_info;	
	slot->location = kmalloc(strlen(drc_name) + 1, GFP_KERNEL);
	if (!slot->location)
		goto error_name;
	slot->name = slot->hotplug_slot->name;
	slot->dn = dn;
	slot->index = drc_index;
	strcpy(slot->location, drc_name);
	slot->power_domain = power_domain;
	slot->hotplug_slot->private = slot;
	slot->hotplug_slot->ops = &rpaphp_hotplug_slot_ops;
	slot->hotplug_slot->release = &rpaphp_release_slot;
	
	return (slot);

error_name:
	kfree(slot->hotplug_slot->name);
error_info:
	kfree(slot->hotplug_slot->info);
error_hpslot:
	kfree(slot->hotplug_slot);
error_slot:
	kfree(slot);
error_nomem:
	return NULL;
}

static int is_registered(struct slot *slot)
{
	struct slot             *tmp_slot;

	list_for_each_entry(tmp_slot, &rpaphp_slot_head, rpaphp_slot_list) {
		if (!strcmp(tmp_slot->name, slot->name))
			return 1;
	}	
	return 0;
}

int rpaphp_deregister_slot(struct slot *slot)
{
	int retval = 0;
	struct hotplug_slot *php_slot = slot->hotplug_slot;

	 dbg("%s - Entry: deregistering slot=%s\n",
		__FUNCTION__, slot->name);

	list_del(&slot->rpaphp_slot_list);
	
	/* remove "phy_location" file */
	rpaphp_sysfs_remove_attr_location(php_slot);

	retval = pci_hp_deregister(php_slot);
	if (retval)
		err("Problem unregistering a slot %s\n", slot->name);
	else
		num_slots--;

	dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval);
	return retval;
}
EXPORT_SYMBOL_GPL(rpaphp_deregister_slot);

int rpaphp_register_slot(struct slot *slot)
{
	int retval;

	dbg("%s registering slot:path[%s] index[%x], name[%s] pdomain[%x] type[%d]\n", 
		__FUNCTION__, slot->dn->full_name, slot->index, slot->name, 
		slot->power_domain, slot->type);
	/* should not try to register the same slot twice */
	if (is_registered(slot)) { /* should't be here */
		err("rpaphp_register_slot: slot[%s] is already registered\n", slot->name);
		rpaphp_release_slot(slot->hotplug_slot);
		return -EAGAIN;
	}	
	retval = pci_hp_register(slot->hotplug_slot);
	if (retval) {
		err("pci_hp_register failed with error %d\n", retval);
		rpaphp_release_slot(slot->hotplug_slot);
		return retval;
	}
	
	/* create "phy_locatoin" file */
	rpaphp_sysfs_add_attr_location(slot->hotplug_slot);	

	/* add slot to our internal list */
	dbg("%s adding slot[%s] to rpaphp_slot_list\n",
	    __FUNCTION__, slot->name);

	list_add(&slot->rpaphp_slot_list, &rpaphp_slot_head);
	info("Slot [%s](PCI location=%s) registered\n", slot->name,
			slot->location);
	num_slots++;
	return 0;
}

int rpaphp_get_power_status(struct slot *slot, u8 * value)
{
	int rc = 0, level;
	
	rc = rtas_get_power_level(slot->power_domain, &level);
	if (rc < 0) {
		err("failed to get power-level for slot(%s), rc=0x%x\n",
			slot->location, rc);
		return rc;
	}

	dbg("%s the power level of slot %s(pwd-domain:0x%x) is %d\n",
		__FUNCTION__, slot->name, slot->power_domain, level);
	*value = level;

	return rc;
}

int rpaphp_set_attention_status(struct slot *slot, u8 status)
{
	int rc;

	/* status: LED_OFF or LED_ON */
	rc = rtas_set_indicator(DR_INDICATOR, slot->index, status);
	if (rc < 0)
		err("slot(name=%s location=%s index=0x%x) set attention-status(%d) failed! rc=0x%x\n",
		    slot->name, slot->location, slot->index, status, rc);

	return rc;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* RPA Virtual I/O device functions
	3	* Copyright (C) 2004 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	*/
	25	#include <linux/kernel.h>
	26	#include <linux/module.h>
	27	#include <linux/kobject.h>
	28	#include <linux/sysfs.h>
	29	#include <linux/pci.h>
4e57b681 TS	30	#include <linux/string.h>
	31	#include <linux/slab.h>
	32
1da177e4 LT	33	#include <asm/rtas.h>
	34	#include "rpaphp.h"
	35
1da177e4 LT	36	static ssize_t location_read_file (struct hotplug_slot php_slot, char buf)
1da177e4 LT	37	{
f6afbad8	38	char *value;
f6afbad8	39	int retval = -ENOENT;
1da177e4 LT	40	struct slot slot = (struct slot )php_slot->private;
	41
	42	if (!slot)
	43	return retval;
	44
f6afbad8	45	value = slot->location;
	46	retval = sprintf (buf, "%s\n", value);
	47	return retval;
1da177e4 LT	48	}
	49
	50	static struct hotplug_slot_attribute hotplug_slot_attr_location = {
	51	.attr = {.name = "phy_location", .mode = S_IFREG \| S_IRUGO},
	52	.show = location_read_file,
	53	};
	54
	55	static void rpaphp_sysfs_add_attr_location (struct hotplug_slot *slot)
	56	{
	57	sysfs_create_file(&slot->kobj, &hotplug_slot_attr_location.attr);
	58	}
	59
	60	static void rpaphp_sysfs_remove_attr_location (struct hotplug_slot *slot)
	61	{
	62	sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_location.attr);
	63	}
	64
	65	/* free up the memory used by a slot */
	66	static void rpaphp_release_slot(struct hotplug_slot *hotplug_slot)
	67	{
	68	struct slot slot = (struct slot ) hotplug_slot->private;
	69
	70	dealloc_slot_struct(slot);
	71	}
	72
	73	void dealloc_slot_struct(struct slot *slot)
	74	{
	75	kfree(slot->hotplug_slot->info);
	76	kfree(slot->hotplug_slot->name);
	77	kfree(slot->hotplug_slot);
	78	kfree(slot);
	79	return;
	80	}
	81
	82	struct slot alloc_slot_struct(struct device_node dn, int drc_index, char *drc_name,
	83	int power_domain)
	84	{
	85	struct slot *slot;
	86
f5afe806	87	slot = kzalloc(sizeof(struct slot), GFP_KERNEL);
1da177e4 LT	88	if (!slot)
1da177e4 LT	89	goto error_nomem;
f5afe806	90	slot->hotplug_slot = kzalloc(sizeof(struct hotplug_slot), GFP_KERNEL);
1da177e4 LT	91	if (!slot->hotplug_slot)
1da177e4 LT	92	goto error_slot;
f5afe806	93	slot->hotplug_slot->info = kzalloc(sizeof(struct hotplug_slot_info),
1da177e4 LT	94	GFP_KERNEL);
	95	if (!slot->hotplug_slot->info)
	96	goto error_hpslot;
1da177e4 LT	97	slot->hotplug_slot->name = kmalloc(BUS_ID_SIZE + 1, GFP_KERNEL);
	98	if (!slot->hotplug_slot->name)
	99	goto error_info;
	100	slot->location = kmalloc(strlen(drc_name) + 1, GFP_KERNEL);
	101	if (!slot->location)
	102	goto error_name;
	103	slot->name = slot->hotplug_slot->name;
	104	slot->dn = dn;
	105	slot->index = drc_index;
	106	strcpy(slot->location, drc_name);
	107	slot->power_domain = power_domain;
	108	slot->hotplug_slot->private = slot;
	109	slot->hotplug_slot->ops = &rpaphp_hotplug_slot_ops;
	110	slot->hotplug_slot->release = &rpaphp_release_slot;
	111
	112	return (slot);
	113
	114	error_name:
	115	kfree(slot->hotplug_slot->name);
	116	error_info:
	117	kfree(slot->hotplug_slot->info);
	118	error_hpslot:
	119	kfree(slot->hotplug_slot);
	120	error_slot:
	121	kfree(slot);
	122	error_nomem:
	123	return NULL;
	124	}
	125
	126	static int is_registered(struct slot *slot)
	127	{
	128	struct slot *tmp_slot;
	129
	130	list_for_each_entry(tmp_slot, &rpaphp_slot_head, rpaphp_slot_list) {
	131	if (!strcmp(tmp_slot->name, slot->name))
	132	return 1;
	133	}
	134	return 0;
	135	}
	136
f6afbad8	137	int rpaphp_deregister_slot(struct slot *slot)
1da177e4 LT	138	{
	139	int retval = 0;
	140	struct hotplug_slot *php_slot = slot->hotplug_slot;
	141
	142	dbg("%s - Entry: deregistering slot=%s\n",
	143	__FUNCTION__, slot->name);
	144
	145	list_del(&slot->rpaphp_slot_list);
	146
	147	/* remove "phy_location" file */
	148	rpaphp_sysfs_remove_attr_location(php_slot);
	149
1da177e4 LT	150	retval = pci_hp_deregister(php_slot);
	151	if (retval)
	152	err("Problem unregistering a slot %s\n", slot->name);
	153	else
	154	num_slots--;
	155
	156	dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval);
	157	return retval;
	158	}
61ee9cd5	159	EXPORT_SYMBOL_GPL(rpaphp_deregister_slot);
1da177e4	160
f6afbad8	161	int rpaphp_register_slot(struct slot *slot)
1da177e4 LT	162	{
	163	int retval;
	164
	165	dbg("%s registering slot:path[%s] index[%x], name[%s] pdomain[%x] type[%d]\n",
	166	__FUNCTION__, slot->dn->full_name, slot->index, slot->name,
	167	slot->power_domain, slot->type);
	168	/* should not try to register the same slot twice */
	169	if (is_registered(slot)) { /* should't be here */
f6afbad8	170	err("rpaphp_register_slot: slot[%s] is already registered\n", slot->name);
1da177e4 LT	171	rpaphp_release_slot(slot->hotplug_slot);
	172	return -EAGAIN;
	173	}
	174	retval = pci_hp_register(slot->hotplug_slot);
	175	if (retval) {
	176	err("pci_hp_register failed with error %d\n", retval);
	177	rpaphp_release_slot(slot->hotplug_slot);
	178	return retval;
	179	}
	180
	181	/* create "phy_locatoin" file */
	182	rpaphp_sysfs_add_attr_location(slot->hotplug_slot);
	183
1da177e4 LT	184	/* add slot to our internal list */
	185	dbg("%s adding slot[%s] to rpaphp_slot_list\n",
	186	__FUNCTION__, slot->name);
	187
	188	list_add(&slot->rpaphp_slot_list, &rpaphp_slot_head);
5eeb8c63 JR	189	info("Slot [%s](PCI location=%s) registered\n", slot->name,
5eeb8c63 JR	190	slot->location);
1da177e4 LT	191	num_slots++;
	192	return 0;
	193	}
	194
	195	int rpaphp_get_power_status(struct slot slot, u8 value)
	196	{
	197	int rc = 0, level;
	198
56d8456b JR	199	rc = rtas_get_power_level(slot->power_domain, &level);
	200	if (rc < 0) {
	201	err("failed to get power-level for slot(%s), rc=0x%x\n",
	202	slot->location, rc);
	203	return rc;
1da177e4 LT	204	}
1da177e4 LT	205
56d8456b JR	206	dbg("%s the power level of slot %s(pwd-domain:0x%x) is %d\n",
	207	__FUNCTION__, slot->name, slot->power_domain, level);
	208	*value = level;
	209
1da177e4 LT	210	return rc;
	211	}
	212
	213	int rpaphp_set_attention_status(struct slot *slot, u8 status)
	214	{
	215	int rc;
	216
	217	/* status: LED_OFF or LED_ON */
	218	rc = rtas_set_indicator(DR_INDICATOR, slot->index, status);
	219	if (rc < 0)
	220	err("slot(name=%s location=%s index=0x%x) set attention-status(%d) failed! rc=0x%x\n",
	221	slot->name, slot->location, slot->index, status, rc);
	222
	223	return rc;
	224	}