[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / scsi / libsas / sas_init.c

/*
 * Serial Attached SCSI (SAS) Transport Layer initialization
 *
 * Copyright (C) 2005 Adaptec, Inc.  All rights reserved.
 * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
 *
 * This file is licensed under GPLv2.
 *
 * 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.  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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA
 *
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/spinlock.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_sas.h>

#include "sas_internal.h"

#include "../scsi_sas_internal.h"

struct kmem_cache *sas_task_cache;

/*------------ SAS addr hash -----------*/
void sas_hash_addr(u8 *hashed, const u8 *sas_addr)
{
        const u32 poly = 0x00DB2777;
        u32     r = 0;
        int     i;

        for (i = 0; i < 8; i++) {
                int b;
                for (b = 7; b >= 0; b--) {
                        r <<= 1;
                        if ((1 << b) & sas_addr[i]) {
                                if (!(r & 0x01000000))
                                        r ^= poly;
                        } else if (r & 0x01000000)
                                r ^= poly;
                }
        }

        hashed[0] = (r >> 16) & 0xFF;
        hashed[1] = (r >> 8) & 0xFF ;
        hashed[2] = r & 0xFF;
}


/* ---------- HA events ---------- */

void sas_hae_reset(struct work_struct *work)
{
	struct sas_ha_event *ev =
		container_of(work, struct sas_ha_event, work);
	struct sas_ha_struct *ha = ev->ha;

	sas_begin_event(HAE_RESET, &ha->event_lock,
			&ha->pending);
}

int sas_register_ha(struct sas_ha_struct *sas_ha)
{
	int error = 0;

	spin_lock_init(&sas_ha->phy_port_lock);
	sas_hash_addr(sas_ha->hashed_sas_addr, sas_ha->sas_addr);

	if (sas_ha->lldd_queue_size == 0)
		sas_ha->lldd_queue_size = 1;
	else if (sas_ha->lldd_queue_size == -1)
		sas_ha->lldd_queue_size = 128; /* Sanity */

	sas_ha->state = SAS_HA_REGISTERED;
	spin_lock_init(&sas_ha->state_lock);

	error = sas_register_phys(sas_ha);
	if (error) {
		printk(KERN_NOTICE "couldn't register sas phys:%d\n", error);
		return error;
	}

	error = sas_register_ports(sas_ha);
	if (error) {
		printk(KERN_NOTICE "couldn't register sas ports:%d\n", error);
		goto Undo_phys;
	}

	error = sas_init_events(sas_ha);
	if (error) {
		printk(KERN_NOTICE "couldn't start event thread:%d\n", error);
		goto Undo_ports;
	}

	if (sas_ha->lldd_max_execute_num > 1) {
		error = sas_init_queue(sas_ha);
		if (error) {
			printk(KERN_NOTICE "couldn't start queue thread:%d, "
			       "running in direct mode\n", error);
			sas_ha->lldd_max_execute_num = 1;
		}
	}

	INIT_LIST_HEAD(&sas_ha->eh_done_q);

	return 0;

Undo_ports:
	sas_unregister_ports(sas_ha);
Undo_phys:

	return error;
}

int sas_unregister_ha(struct sas_ha_struct *sas_ha)
{
	unsigned long flags;

	/* Set the state to unregistered to avoid further
	 * events to be queued */
	spin_lock_irqsave(&sas_ha->state_lock, flags);
	sas_ha->state = SAS_HA_UNREGISTERED;
	spin_unlock_irqrestore(&sas_ha->state_lock, flags);
	scsi_flush_work(sas_ha->core.shost);

	sas_unregister_ports(sas_ha);

	if (sas_ha->lldd_max_execute_num > 1) {
		sas_shutdown_queue(sas_ha);
		sas_ha->lldd_max_execute_num = 1;
	}

	return 0;
}

static int sas_get_linkerrors(struct sas_phy *phy)
{
	if (scsi_is_sas_phy_local(phy))
		/* FIXME: we have no local phy stats
		 * gathering at this time */
		return -EINVAL;

	return sas_smp_get_phy_events(phy);
}

int sas_phy_enable(struct sas_phy *phy, int enable)
{
	int ret;
	enum phy_func command;

	if (enable)
		command = PHY_FUNC_LINK_RESET;
	else
		command = PHY_FUNC_DISABLE;

	if (scsi_is_sas_phy_local(phy)) {
		struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
		struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
		struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
		struct sas_internal *i =
			to_sas_internal(sas_ha->core.shost->transportt);

		if (!enable) {
			sas_phy_disconnected(asd_phy);
			sas_ha->notify_phy_event(asd_phy, PHYE_LOSS_OF_SIGNAL);
		}
		ret = i->dft->lldd_control_phy(asd_phy, command, NULL);
	} else {
		struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
		struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
		ret = sas_smp_phy_control(ddev, phy->number, command, NULL);
	}
	return ret;
}

int sas_phy_reset(struct sas_phy *phy, int hard_reset)
{
	int ret;
	enum phy_func reset_type;

	if (hard_reset)
		reset_type = PHY_FUNC_HARD_RESET;
	else
		reset_type = PHY_FUNC_LINK_RESET;

	if (scsi_is_sas_phy_local(phy)) {
		struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
		struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
		struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
		struct sas_internal *i =
			to_sas_internal(sas_ha->core.shost->transportt);

		ret = i->dft->lldd_control_phy(asd_phy, reset_type, NULL);
	} else {
		struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
		struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
		ret = sas_smp_phy_control(ddev, phy->number, reset_type, NULL);
	}
	return ret;
}

int sas_set_phy_speed(struct sas_phy *phy,
		      struct sas_phy_linkrates *rates)
{
	int ret;

	if ((rates->minimum_linkrate &&
	     rates->minimum_linkrate > phy->maximum_linkrate) ||
	    (rates->maximum_linkrate &&
	     rates->maximum_linkrate < phy->minimum_linkrate))
		return -EINVAL;

	if (rates->minimum_linkrate &&
	    rates->minimum_linkrate < phy->minimum_linkrate_hw)
		rates->minimum_linkrate = phy->minimum_linkrate_hw;

	if (rates->maximum_linkrate &&
	    rates->maximum_linkrate > phy->maximum_linkrate_hw)
		rates->maximum_linkrate = phy->maximum_linkrate_hw;

	if (scsi_is_sas_phy_local(phy)) {
		struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
		struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
		struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
		struct sas_internal *i =
			to_sas_internal(sas_ha->core.shost->transportt);

		ret = i->dft->lldd_control_phy(asd_phy, PHY_FUNC_SET_LINK_RATE,
					       rates);
	} else {
		struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
		struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
		ret = sas_smp_phy_control(ddev, phy->number,
					  PHY_FUNC_LINK_RESET, rates);

	}

	return ret;
}

static struct sas_function_template sft = {
	.phy_enable = sas_phy_enable,
	.phy_reset = sas_phy_reset,
	.set_phy_speed = sas_set_phy_speed,
	.get_linkerrors = sas_get_linkerrors,
};

struct scsi_transport_template *
sas_domain_attach_transport(struct sas_domain_function_template *dft)
{
	struct scsi_transport_template *stt = sas_attach_transport(&sft);
	struct sas_internal *i;

	if (!stt)
		return stt;

	i = to_sas_internal(stt);
	i->dft = dft;
	stt->create_work_queue = 1;
	stt->eh_timed_out = sas_scsi_timed_out;
	stt->eh_strategy_handler = sas_scsi_recover_host;

	return stt;
}
EXPORT_SYMBOL_GPL(sas_domain_attach_transport);


void sas_domain_release_transport(struct scsi_transport_template *stt)
{
	sas_release_transport(stt);
}
EXPORT_SYMBOL_GPL(sas_domain_release_transport);

/* ---------- SAS Class register/unregister ---------- */

static int __init sas_class_init(void)
{
	sas_task_cache = kmem_cache_create("sas_task", sizeof(struct sas_task),
					   0, SLAB_HWCACHE_ALIGN, NULL);
	if (!sas_task_cache)
		return -ENOMEM;

	return 0;
}

static void __exit sas_class_exit(void)
{
	kmem_cache_destroy(sas_task_cache);
}

MODULE_AUTHOR("Luben Tuikov <luben_tuikov@adaptec.com>");
MODULE_DESCRIPTION("SAS Transport Layer");
MODULE_LICENSE("GPL v2");

module_init(sas_class_init);
module_exit(sas_class_exit);

EXPORT_SYMBOL_GPL(sas_register_ha);
EXPORT_SYMBOL_GPL(sas_unregister_ha);
Commit	Line	Data
2908d778 JB	1	/*
	2	* Serial Attached SCSI (SAS) Transport Layer initialization
	3	*
	4	* Copyright (C) 2005 Adaptec, Inc. All rights reserved.
	5	* Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
	6	*
	7	* This file is licensed under GPLv2.
	8	*
	9	* This program is free software; you can redistribute it and/or
	10	* modify it under the terms of the GNU General Public License as
	11	* published by the Free Software Foundation; either version 2 of the
	12	* License, or (at your option) any later version.
	13	*
	14	* This program is distributed in the hope that it will be useful, but
	15	* WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	17	* General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License
	20	* along with this program; if not, write to the Free Software
	21	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
	22	* USA
	23	*
	24	*/
	25
	26	#include <linux/module.h>
	27	#include <linux/init.h>
	28	#include <linux/device.h>
	29	#include <linux/spinlock.h>
	30	#include <scsi/scsi_host.h>
	31	#include <scsi/scsi_device.h>
	32	#include <scsi/scsi_transport.h>
	33	#include <scsi/scsi_transport_sas.h>
	34
	35	#include "sas_internal.h"
	36
	37	#include "../scsi_sas_internal.h"
	38
e18b890b	39	struct kmem_cache *sas_task_cache;
2908d778 JB	40
	41	/------------ SAS addr hash -----------/
	42	void sas_hash_addr(u8 hashed, const u8 sas_addr)
	43	{
	44	const u32 poly = 0x00DB2777;
	45	u32 r = 0;
	46	int i;
	47
	48	for (i = 0; i < 8; i++) {
	49	int b;
	50	for (b = 7; b >= 0; b--) {
	51	r <<= 1;
	52	if ((1 << b) & sas_addr[i]) {
	53	if (!(r & 0x01000000))
	54	r ^= poly;
	55	} else if (r & 0x01000000)
	56	r ^= poly;
	57	}
	58	}
	59
	60	hashed[0] = (r >> 16) & 0xFF;
	61	hashed[1] = (r >> 8) & 0xFF ;
	62	hashed[2] = r & 0xFF;
	63	}
	64
	65
	66	/* ---------- HA events ---------- */
	67
c4028958	68	void sas_hae_reset(struct work_struct *work)
2908d778	69	{
c4028958 DH	70	struct sas_ha_event *ev =
	71	container_of(work, struct sas_ha_event, work);
	72	struct sas_ha_struct *ha = ev->ha;
2908d778 JB	73
	74	sas_begin_event(HAE_RESET, &ha->event_lock,
	75	&ha->pending);
	76	}
	77
	78	int sas_register_ha(struct sas_ha_struct *sas_ha)
	79	{
	80	int error = 0;
	81
	82	spin_lock_init(&sas_ha->phy_port_lock);
	83	sas_hash_addr(sas_ha->hashed_sas_addr, sas_ha->sas_addr);
	84
	85	if (sas_ha->lldd_queue_size == 0)
	86	sas_ha->lldd_queue_size = 1;
	87	else if (sas_ha->lldd_queue_size == -1)
	88	sas_ha->lldd_queue_size = 128; /* Sanity */
	89
6b0efb85 DW	90	sas_ha->state = SAS_HA_REGISTERED;
	91	spin_lock_init(&sas_ha->state_lock);
	92
2908d778 JB	93	error = sas_register_phys(sas_ha);
	94	if (error) {
	95	printk(KERN_NOTICE "couldn't register sas phys:%d\n", error);
	96	return error;
	97	}
	98
	99	error = sas_register_ports(sas_ha);
	100	if (error) {
	101	printk(KERN_NOTICE "couldn't register sas ports:%d\n", error);
	102	goto Undo_phys;
	103	}
	104
	105	error = sas_init_events(sas_ha);
	106	if (error) {
	107	printk(KERN_NOTICE "couldn't start event thread:%d\n", error);
	108	goto Undo_ports;
	109	}
	110
	111	if (sas_ha->lldd_max_execute_num > 1) {
	112	error = sas_init_queue(sas_ha);
	113	if (error) {
	114	printk(KERN_NOTICE "couldn't start queue thread:%d, "
	115	"running in direct mode\n", error);
	116	sas_ha->lldd_max_execute_num = 1;
	117	}
	118	}
	119
f456393e DW	120	INIT_LIST_HEAD(&sas_ha->eh_done_q);
f456393e DW	121
2908d778 JB	122	return 0;
	123
	124	Undo_ports:
	125	sas_unregister_ports(sas_ha);
	126	Undo_phys:
	127
	128	return error;
	129	}
	130
	131	int sas_unregister_ha(struct sas_ha_struct *sas_ha)
	132	{
6b0efb85 DW	133	unsigned long flags;
	134
	135	/* Set the state to unregistered to avoid further
	136	* events to be queued */
	137	spin_lock_irqsave(&sas_ha->state_lock, flags);
	138	sas_ha->state = SAS_HA_UNREGISTERED;
	139	spin_unlock_irqrestore(&sas_ha->state_lock, flags);
	140	scsi_flush_work(sas_ha->core.shost);
	141
cde3f74b DW	142	sas_unregister_ports(sas_ha);
cde3f74b DW	143
2908d778 JB	144	if (sas_ha->lldd_max_execute_num > 1) {
2908d778 JB	145	sas_shutdown_queue(sas_ha);
cde3f74b	146	sas_ha->lldd_max_execute_num = 1;
2908d778 JB	147	}
2908d778 JB	148
2908d778 JB	149	return 0;
	150	}
	151
	152	static int sas_get_linkerrors(struct sas_phy *phy)
	153	{
	154	if (scsi_is_sas_phy_local(phy))
	155	/* FIXME: we have no local phy stats
	156	* gathering at this time */
	157	return -EINVAL;
	158
	159	return sas_smp_get_phy_events(phy);
	160	}
	161
acbf167d DW	162	int sas_phy_enable(struct sas_phy *phy, int enable)
	163	{
	164	int ret;
	165	enum phy_func command;
	166
	167	if (enable)
	168	command = PHY_FUNC_LINK_RESET;
	169	else
	170	command = PHY_FUNC_DISABLE;
	171
	172	if (scsi_is_sas_phy_local(phy)) {
	173	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
	174	struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
	175	struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
	176	struct sas_internal *i =
	177	to_sas_internal(sas_ha->core.shost->transportt);
	178
	179	if (!enable) {
	180	sas_phy_disconnected(asd_phy);
	181	sas_ha->notify_phy_event(asd_phy, PHYE_LOSS_OF_SIGNAL);
	182	}
	183	ret = i->dft->lldd_control_phy(asd_phy, command, NULL);
	184	} else {
	185	struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
	186	struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
	187	ret = sas_smp_phy_control(ddev, phy->number, command, NULL);
	188	}
	189	return ret;
	190	}
	191
dea22214	192	int sas_phy_reset(struct sas_phy *phy, int hard_reset)
2908d778 JB	193	{
	194	int ret;
	195	enum phy_func reset_type;
	196
	197	if (hard_reset)
	198	reset_type = PHY_FUNC_HARD_RESET;
	199	else
	200	reset_type = PHY_FUNC_LINK_RESET;
	201
	202	if (scsi_is_sas_phy_local(phy)) {
	203	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
	204	struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
	205	struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
	206	struct sas_internal *i =
	207	to_sas_internal(sas_ha->core.shost->transportt);
	208
a01e70e5	209	ret = i->dft->lldd_control_phy(asd_phy, reset_type, NULL);
2908d778 JB	210	} else {
	211	struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
	212	struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
a01e70e5	213	ret = sas_smp_phy_control(ddev, phy->number, reset_type, NULL);
2908d778 JB	214	}
	215	return ret;
	216	}
	217
acbf167d DW	218	int sas_set_phy_speed(struct sas_phy *phy,
acbf167d DW	219	struct sas_phy_linkrates *rates)
a01e70e5 JB	220	{
	221	int ret;
	222
	223	if ((rates->minimum_linkrate &&
	224	rates->minimum_linkrate > phy->maximum_linkrate) \|\|
	225	(rates->maximum_linkrate &&
	226	rates->maximum_linkrate < phy->minimum_linkrate))
	227	return -EINVAL;
	228
	229	if (rates->minimum_linkrate &&
	230	rates->minimum_linkrate < phy->minimum_linkrate_hw)
	231	rates->minimum_linkrate = phy->minimum_linkrate_hw;
	232
	233	if (rates->maximum_linkrate &&
	234	rates->maximum_linkrate > phy->maximum_linkrate_hw)
	235	rates->maximum_linkrate = phy->maximum_linkrate_hw;
	236
	237	if (scsi_is_sas_phy_local(phy)) {
	238	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
	239	struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
	240	struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
	241	struct sas_internal *i =
	242	to_sas_internal(sas_ha->core.shost->transportt);
	243
	244	ret = i->dft->lldd_control_phy(asd_phy, PHY_FUNC_SET_LINK_RATE,
	245	rates);
	246	} else {
	247	struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
	248	struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
	249	ret = sas_smp_phy_control(ddev, phy->number,
	250	PHY_FUNC_LINK_RESET, rates);
	251
	252	}
	253
	254	return ret;
	255	}
	256
2908d778	257	static struct sas_function_template sft = {
acbf167d	258	.phy_enable = sas_phy_enable,
2908d778	259	.phy_reset = sas_phy_reset,
a01e70e5	260	.set_phy_speed = sas_set_phy_speed,
2908d778 JB	261	.get_linkerrors = sas_get_linkerrors,
	262	};
	263
	264	struct scsi_transport_template *
	265	sas_domain_attach_transport(struct sas_domain_function_template *dft)
	266	{
	267	struct scsi_transport_template *stt = sas_attach_transport(&sft);
	268	struct sas_internal *i;
	269
	270	if (!stt)
	271	return stt;
	272
	273	i = to_sas_internal(stt);
	274	i->dft = dft;
	275	stt->create_work_queue = 1;
	276	stt->eh_timed_out = sas_scsi_timed_out;
	277	stt->eh_strategy_handler = sas_scsi_recover_host;
	278
	279	return stt;
	280	}
	281	EXPORT_SYMBOL_GPL(sas_domain_attach_transport);
	282
	283
	284	void sas_domain_release_transport(struct scsi_transport_template *stt)
	285	{
	286	sas_release_transport(stt);
	287	}
	288	EXPORT_SYMBOL_GPL(sas_domain_release_transport);
	289
	290	/* ---------- SAS Class register/unregister ---------- */
	291
	292	static int __init sas_class_init(void)
	293	{
	294	sas_task_cache = kmem_cache_create("sas_task", sizeof(struct sas_task),
20c2df83	295	0, SLAB_HWCACHE_ALIGN, NULL);
2908d778 JB	296	if (!sas_task_cache)
	297	return -ENOMEM;
	298
	299	return 0;
	300	}
	301
	302	static void __exit sas_class_exit(void)
	303	{
	304	kmem_cache_destroy(sas_task_cache);
	305	}
	306
	307	MODULE_AUTHOR("Luben Tuikov <luben_tuikov@adaptec.com>");
	308	MODULE_DESCRIPTION("SAS Transport Layer");
	309	MODULE_LICENSE("GPL v2");
	310
	311	module_init(sas_class_init);
	312	module_exit(sas_class_exit);
	313
	314	EXPORT_SYMBOL_GPL(sas_register_ha);
	315	EXPORT_SYMBOL_GPL(sas_unregister_ha);