1/*
2 * Serial Attached SCSI (SAS) Phy class
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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
22 *
23 */
24
25#include "sas_internal.h"
26#include <scsi/scsi_host.h>
27#include <scsi/scsi_transport.h>
28#include <scsi/scsi_transport_sas.h>
29#include "../scsi_sas_internal.h"
30
31/* ---------- Phy events ---------- */
32
33static void sas_phye_loss_of_signal(struct work_struct *work)
34{
35	struct asd_sas_event *ev = to_asd_sas_event(work);
36	struct asd_sas_phy *phy = ev->phy;
37
38	clear_bit(PHYE_LOSS_OF_SIGNAL, &phy->phy_events_pending);
39	phy->error = 0;
40	sas_deform_port(phy, 1);
41}
42
43static void sas_phye_oob_done(struct work_struct *work)
44{
45	struct asd_sas_event *ev = to_asd_sas_event(work);
46	struct asd_sas_phy *phy = ev->phy;
47
48	clear_bit(PHYE_OOB_DONE, &phy->phy_events_pending);
49	phy->error = 0;
50}
51
52static void sas_phye_oob_error(struct work_struct *work)
53{
54	struct asd_sas_event *ev = to_asd_sas_event(work);
55	struct asd_sas_phy *phy = ev->phy;
56	struct sas_ha_struct *sas_ha = phy->ha;
57	struct asd_sas_port *port = phy->port;
58	struct sas_internal *i =
59		to_sas_internal(sas_ha->core.shost->transportt);
60
61	clear_bit(PHYE_OOB_ERROR, &phy->phy_events_pending);
62
63	sas_deform_port(phy, 1);
64
65	if (!port && phy->enabled && i->dft->lldd_control_phy) {
66		phy->error++;
67		switch (phy->error) {
68		case 1:
69		case 2:
70			i->dft->lldd_control_phy(phy, PHY_FUNC_HARD_RESET,
71						 NULL);
72			break;
73		case 3:
74		default:
75			phy->error = 0;
76			phy->enabled = 0;
77			i->dft->lldd_control_phy(phy, PHY_FUNC_DISABLE, NULL);
78			break;
79		}
80	}
81}
82
83static void sas_phye_spinup_hold(struct work_struct *work)
84{
85	struct asd_sas_event *ev = to_asd_sas_event(work);
86	struct asd_sas_phy *phy = ev->phy;
87	struct sas_ha_struct *sas_ha = phy->ha;
88	struct sas_internal *i =
89		to_sas_internal(sas_ha->core.shost->transportt);
90
91	clear_bit(PHYE_SPINUP_HOLD, &phy->phy_events_pending);
92
93	phy->error = 0;
94	i->dft->lldd_control_phy(phy, PHY_FUNC_RELEASE_SPINUP_HOLD, NULL);
95}
96
97static void sas_phye_resume_timeout(struct work_struct *work)
98{
99	struct asd_sas_event *ev = to_asd_sas_event(work);
100	struct asd_sas_phy *phy = ev->phy;
101
102	clear_bit(PHYE_RESUME_TIMEOUT, &phy->phy_events_pending);
103
104	/* phew, lldd got the phy back in the nick of time */
105	if (!phy->suspended) {
106		dev_info(&phy->phy->dev, "resume timeout cancelled\n");
107		return;
108	}
109
110	phy->error = 0;
111	phy->suspended = 0;
112	sas_deform_port(phy, 1);
113}
114
115
116/* ---------- Phy class registration ---------- */
117
118int sas_register_phys(struct sas_ha_struct *sas_ha)
119{
120	int i;
121
122	static const work_func_t sas_phy_event_fns[PHY_NUM_EVENTS] = {
123		[PHYE_LOSS_OF_SIGNAL] = sas_phye_loss_of_signal,
124		[PHYE_OOB_DONE] = sas_phye_oob_done,
125		[PHYE_OOB_ERROR] = sas_phye_oob_error,
126		[PHYE_SPINUP_HOLD] = sas_phye_spinup_hold,
127		[PHYE_RESUME_TIMEOUT] = sas_phye_resume_timeout,
128
129	};
130
131	static const work_func_t sas_port_event_fns[PORT_NUM_EVENTS] = {
132		[PORTE_BYTES_DMAED] = sas_porte_bytes_dmaed,
133		[PORTE_BROADCAST_RCVD] = sas_porte_broadcast_rcvd,
134		[PORTE_LINK_RESET_ERR] = sas_porte_link_reset_err,
135		[PORTE_TIMER_EVENT] = sas_porte_timer_event,
136		[PORTE_HARD_RESET] = sas_porte_hard_reset,
137	};
138
139	/* Now register the phys. */
140	for (i = 0; i < sas_ha->num_phys; i++) {
141		int k;
142		struct asd_sas_phy *phy = sas_ha->sas_phy[i];
143
144		phy->error = 0;
145		INIT_LIST_HEAD(&phy->port_phy_el);
146		for (k = 0; k < PORT_NUM_EVENTS; k++) {
147			INIT_SAS_WORK(&phy->port_events[k].work, sas_port_event_fns[k]);
148			phy->port_events[k].phy = phy;
149		}
150
151		for (k = 0; k < PHY_NUM_EVENTS; k++) {
152			INIT_SAS_WORK(&phy->phy_events[k].work, sas_phy_event_fns[k]);
153			phy->phy_events[k].phy = phy;
154		}
155
156		phy->port = NULL;
157		phy->ha = sas_ha;
158		spin_lock_init(&phy->frame_rcvd_lock);
159		spin_lock_init(&phy->sas_prim_lock);
160		phy->frame_rcvd_size = 0;
161
162		phy->phy = sas_phy_alloc(&sas_ha->core.shost->shost_gendev, i);
163		if (!phy->phy)
164			return -ENOMEM;
165
166		phy->phy->identify.initiator_port_protocols =
167			phy->iproto;
168		phy->phy->identify.target_port_protocols = phy->tproto;
169		phy->phy->identify.sas_address = SAS_ADDR(sas_ha->sas_addr);
170		phy->phy->identify.phy_identifier = i;
171		phy->phy->minimum_linkrate_hw = SAS_LINK_RATE_UNKNOWN;
172		phy->phy->maximum_linkrate_hw = SAS_LINK_RATE_UNKNOWN;
173		phy->phy->minimum_linkrate = SAS_LINK_RATE_UNKNOWN;
174		phy->phy->maximum_linkrate = SAS_LINK_RATE_UNKNOWN;
175		phy->phy->negotiated_linkrate = SAS_LINK_RATE_UNKNOWN;
176
177		sas_phy_add(phy->phy);
178	}
179
180	return 0;
181}
182