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
39struct kmem_cache *sas_task_cache;
40
41/*------------ SAS addr hash -----------*/
42void 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
68void sas_hae_reset(struct work_struct *work)
69{
70	struct sas_ha_event *ev =
71		container_of(work, struct sas_ha_event, work);
72	struct sas_ha_struct *ha = ev->ha;
73
74	sas_begin_event(HAE_RESET, &ha->event_lock,
75			&ha->pending);
76}
77
78int 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
90	sas_ha->state = SAS_HA_REGISTERED;
91	spin_lock_init(&sas_ha->state_lock);
92
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
120	INIT_LIST_HEAD(&sas_ha->eh_done_q);
121
122	return 0;
123
124Undo_ports:
125	sas_unregister_ports(sas_ha);
126Undo_phys:
127
128	return error;
129}
130
131int sas_unregister_ha(struct sas_ha_struct *sas_ha)
132{
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
142	sas_unregister_ports(sas_ha);
143
144	if (sas_ha->lldd_max_execute_num > 1) {
145		sas_shutdown_queue(sas_ha);
146		sas_ha->lldd_max_execute_num = 1;
147	}
148
149	return 0;
150}
151
152static int sas_get_linkerrors(struct sas_phy *phy)
153{
154	if (scsi_is_sas_phy_local(phy))
155		return -EINVAL;
156
157	return sas_smp_get_phy_events(phy);
158}
159
160int sas_phy_enable(struct sas_phy *phy, int enable)
161{
162	int ret;
163	enum phy_func command;
164
165	if (enable)
166		command = PHY_FUNC_LINK_RESET;
167	else
168		command = PHY_FUNC_DISABLE;
169
170	if (scsi_is_sas_phy_local(phy)) {
171		struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
172		struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
173		struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
174		struct sas_internal *i =
175			to_sas_internal(sas_ha->core.shost->transportt);
176
177		if (!enable) {
178			sas_phy_disconnected(asd_phy);
179			sas_ha->notify_phy_event(asd_phy, PHYE_LOSS_OF_SIGNAL);
180		}
181		ret = i->dft->lldd_control_phy(asd_phy, command, NULL);
182	} else {
183		struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
184		struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
185		ret = sas_smp_phy_control(ddev, phy->number, command, NULL);
186	}
187	return ret;
188}
189
190int sas_phy_reset(struct sas_phy *phy, int hard_reset)
191{
192	int ret;
193	enum phy_func reset_type;
194
195	if (hard_reset)
196		reset_type = PHY_FUNC_HARD_RESET;
197	else
198		reset_type = PHY_FUNC_LINK_RESET;
199
200	if (scsi_is_sas_phy_local(phy)) {
201		struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
202		struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
203		struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
204		struct sas_internal *i =
205			to_sas_internal(sas_ha->core.shost->transportt);
206
207		ret = i->dft->lldd_control_phy(asd_phy, reset_type, NULL);
208	} else {
209		struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
210		struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
211		ret = sas_smp_phy_control(ddev, phy->number, reset_type, NULL);
212	}
213	return ret;
214}
215
216int sas_set_phy_speed(struct sas_phy *phy,
217		      struct sas_phy_linkrates *rates)
218{
219	int ret;
220
221	if ((rates->minimum_linkrate &&
222	     rates->minimum_linkrate > phy->maximum_linkrate) ||
223	    (rates->maximum_linkrate &&
224	     rates->maximum_linkrate < phy->minimum_linkrate))
225		return -EINVAL;
226
227	if (rates->minimum_linkrate &&
228	    rates->minimum_linkrate < phy->minimum_linkrate_hw)
229		rates->minimum_linkrate = phy->minimum_linkrate_hw;
230
231	if (rates->maximum_linkrate &&
232	    rates->maximum_linkrate > phy->maximum_linkrate_hw)
233		rates->maximum_linkrate = phy->maximum_linkrate_hw;
234
235	if (scsi_is_sas_phy_local(phy)) {
236		struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
237		struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
238		struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
239		struct sas_internal *i =
240			to_sas_internal(sas_ha->core.shost->transportt);
241
242		ret = i->dft->lldd_control_phy(asd_phy, PHY_FUNC_SET_LINK_RATE,
243					       rates);
244	} else {
245		struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
246		struct domain_device *ddev = sas_find_dev_by_rphy(rphy);
247		ret = sas_smp_phy_control(ddev, phy->number,
248					  PHY_FUNC_LINK_RESET, rates);
249
250	}
251
252	return ret;
253}
254
255static struct sas_function_template sft = {
256	.phy_enable = sas_phy_enable,
257	.phy_reset = sas_phy_reset,
258	.set_phy_speed = sas_set_phy_speed,
259	.get_linkerrors = sas_get_linkerrors,
260};
261
262struct scsi_transport_template *
263sas_domain_attach_transport(struct sas_domain_function_template *dft)
264{
265	struct scsi_transport_template *stt = sas_attach_transport(&sft);
266	struct sas_internal *i;
267
268	if (!stt)
269		return stt;
270
271	i = to_sas_internal(stt);
272	i->dft = dft;
273	stt->create_work_queue = 1;
274	stt->eh_timed_out = sas_scsi_timed_out;
275	stt->eh_strategy_handler = sas_scsi_recover_host;
276
277	return stt;
278}
279EXPORT_SYMBOL_GPL(sas_domain_attach_transport);
280
281
282void sas_domain_release_transport(struct scsi_transport_template *stt)
283{
284	sas_release_transport(stt);
285}
286EXPORT_SYMBOL_GPL(sas_domain_release_transport);
287
288/* ---------- SAS Class register/unregister ---------- */
289
290static int __init sas_class_init(void)
291{
292	sas_task_cache = kmem_cache_create("sas_task", sizeof(struct sas_task),
293					   0, SLAB_HWCACHE_ALIGN, NULL, NULL);
294	if (!sas_task_cache)
295		return -ENOMEM;
296
297	return 0;
298}
299
300static void __exit sas_class_exit(void)
301{
302	kmem_cache_destroy(sas_task_cache);
303}
304
305MODULE_AUTHOR("Luben Tuikov <luben_tuikov@adaptec.com>");
306MODULE_DESCRIPTION("SAS Transport Layer");
307MODULE_LICENSE("GPL v2");
308
309module_init(sas_class_init);
310module_exit(sas_class_exit);
311
312EXPORT_SYMBOL_GPL(sas_register_ha);
313EXPORT_SYMBOL_GPL(sas_unregister_ha);
314