xref: /openbmc/linux/drivers/scsi/libsas/sas_phy.c (revision 22246614)
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 
33 static void sas_phye_loss_of_signal(struct work_struct *work)
34 {
35 	struct asd_sas_event *ev =
36 		container_of(work, struct asd_sas_event, work);
37 	struct asd_sas_phy *phy = ev->phy;
38 
39 	sas_begin_event(PHYE_LOSS_OF_SIGNAL, &phy->ha->event_lock,
40 			&phy->phy_events_pending);
41 	phy->error = 0;
42 	sas_deform_port(phy);
43 }
44 
45 static void sas_phye_oob_done(struct work_struct *work)
46 {
47 	struct asd_sas_event *ev =
48 		container_of(work, struct asd_sas_event, work);
49 	struct asd_sas_phy *phy = ev->phy;
50 
51 	sas_begin_event(PHYE_OOB_DONE, &phy->ha->event_lock,
52 			&phy->phy_events_pending);
53 	phy->error = 0;
54 }
55 
56 static void sas_phye_oob_error(struct work_struct *work)
57 {
58 	struct asd_sas_event *ev =
59 		container_of(work, struct asd_sas_event, work);
60 	struct asd_sas_phy *phy = ev->phy;
61 	struct sas_ha_struct *sas_ha = phy->ha;
62 	struct asd_sas_port *port = phy->port;
63 	struct sas_internal *i =
64 		to_sas_internal(sas_ha->core.shost->transportt);
65 
66 	sas_begin_event(PHYE_OOB_ERROR, &phy->ha->event_lock,
67 			&phy->phy_events_pending);
68 
69 	sas_deform_port(phy);
70 
71 	if (!port && phy->enabled && i->dft->lldd_control_phy) {
72 		phy->error++;
73 		switch (phy->error) {
74 		case 1:
75 		case 2:
76 			i->dft->lldd_control_phy(phy, PHY_FUNC_HARD_RESET,
77 						 NULL);
78 			break;
79 		case 3:
80 		default:
81 			phy->error = 0;
82 			phy->enabled = 0;
83 			i->dft->lldd_control_phy(phy, PHY_FUNC_DISABLE, NULL);
84 			break;
85 		}
86 	}
87 }
88 
89 static void sas_phye_spinup_hold(struct work_struct *work)
90 {
91 	struct asd_sas_event *ev =
92 		container_of(work, struct asd_sas_event, work);
93 	struct asd_sas_phy *phy = ev->phy;
94 	struct sas_ha_struct *sas_ha = phy->ha;
95 	struct sas_internal *i =
96 		to_sas_internal(sas_ha->core.shost->transportt);
97 
98 	sas_begin_event(PHYE_SPINUP_HOLD, &phy->ha->event_lock,
99 			&phy->phy_events_pending);
100 
101 	phy->error = 0;
102 	i->dft->lldd_control_phy(phy, PHY_FUNC_RELEASE_SPINUP_HOLD, NULL);
103 }
104 
105 /* ---------- Phy class registration ---------- */
106 
107 int sas_register_phys(struct sas_ha_struct *sas_ha)
108 {
109 	int i;
110 
111 	static const work_func_t sas_phy_event_fns[PHY_NUM_EVENTS] = {
112 		[PHYE_LOSS_OF_SIGNAL] = sas_phye_loss_of_signal,
113 		[PHYE_OOB_DONE] = sas_phye_oob_done,
114 		[PHYE_OOB_ERROR] = sas_phye_oob_error,
115 		[PHYE_SPINUP_HOLD] = sas_phye_spinup_hold,
116 	};
117 
118 	static const work_func_t sas_port_event_fns[PORT_NUM_EVENTS] = {
119 		[PORTE_BYTES_DMAED] = sas_porte_bytes_dmaed,
120 		[PORTE_BROADCAST_RCVD] = sas_porte_broadcast_rcvd,
121 		[PORTE_LINK_RESET_ERR] = sas_porte_link_reset_err,
122 		[PORTE_TIMER_EVENT] = sas_porte_timer_event,
123 		[PORTE_HARD_RESET] = sas_porte_hard_reset,
124 	};
125 
126 	/* Now register the phys. */
127 	for (i = 0; i < sas_ha->num_phys; i++) {
128 		int k;
129 		struct asd_sas_phy *phy = sas_ha->sas_phy[i];
130 
131 		phy->error = 0;
132 		INIT_LIST_HEAD(&phy->port_phy_el);
133 		for (k = 0; k < PORT_NUM_EVENTS; k++) {
134 			INIT_WORK(&phy->port_events[k].work,
135 				  sas_port_event_fns[k]);
136 			phy->port_events[k].phy = phy;
137 		}
138 
139 		for (k = 0; k < PHY_NUM_EVENTS; k++) {
140 			INIT_WORK(&phy->phy_events[k].work,
141 				  sas_phy_event_fns[k]);
142 			phy->phy_events[k].phy = phy;
143 		}
144 
145 		phy->port = NULL;
146 		phy->ha = sas_ha;
147 		spin_lock_init(&phy->frame_rcvd_lock);
148 		spin_lock_init(&phy->sas_prim_lock);
149 		phy->frame_rcvd_size = 0;
150 
151 		phy->phy = sas_phy_alloc(&sas_ha->core.shost->shost_gendev,
152 					 i);
153 		if (!phy->phy)
154 			return -ENOMEM;
155 
156 		phy->phy->identify.initiator_port_protocols =
157 			phy->iproto;
158 		phy->phy->identify.target_port_protocols = phy->tproto;
159 		phy->phy->identify.sas_address = SAS_ADDR(sas_ha->sas_addr);
160 		phy->phy->identify.phy_identifier = i;
161 		phy->phy->minimum_linkrate_hw = SAS_LINK_RATE_UNKNOWN;
162 		phy->phy->maximum_linkrate_hw = SAS_LINK_RATE_UNKNOWN;
163 		phy->phy->minimum_linkrate = SAS_LINK_RATE_UNKNOWN;
164 		phy->phy->maximum_linkrate = SAS_LINK_RATE_UNKNOWN;
165 		phy->phy->negotiated_linkrate = SAS_LINK_RATE_UNKNOWN;
166 
167 		sas_phy_add(phy->phy);
168 	}
169 
170 	return 0;
171 }
172