1/*
  2 *    driver for Microsemi PQI-based storage controllers
  3 *    Copyright (c) 2016-2017 Microsemi Corporation
  4 *    Copyright (c) 2016 PMC-Sierra, Inc.
  5 *
  6 *    This program is free software; you can redistribute it and/or modify
  7 *    it under the terms of the GNU General Public License as published by
  8 *    the Free Software Foundation; version 2 of the License.
  9 *
 10 *    This program is distributed in the hope that it will be useful,
 11 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 12 *    MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 13 *    NON INFRINGEMENT.  See the GNU General Public License for more details.
 14 *
 15 *    Questions/Comments/Bugfixes to esc.storagedev@microsemi.com
 16 *
 17 */
 18
 19#include <linux/kernel.h>
 20#include <scsi/scsi_host.h>
 21#include <scsi/scsi_cmnd.h>
 22#include <scsi/scsi_transport_sas.h>
 23#include "smartpqi.h"
 24
 25static struct pqi_sas_phy *pqi_alloc_sas_phy(struct pqi_sas_port *pqi_sas_port)
 26{
 27	struct pqi_sas_phy *pqi_sas_phy;
 28	struct sas_phy *phy;
 29
 30	pqi_sas_phy = kzalloc(sizeof(*pqi_sas_phy), GFP_KERNEL);
 31	if (!pqi_sas_phy)
 32		return NULL;
 33
 34	phy = sas_phy_alloc(pqi_sas_port->parent_node->parent_dev,
 35		pqi_sas_port->next_phy_index);
 36	if (!phy) {
 37		kfree(pqi_sas_phy);
 38		return NULL;
 39	}
 40
 41	pqi_sas_port->next_phy_index++;
 42	pqi_sas_phy->phy = phy;
 43	pqi_sas_phy->parent_port = pqi_sas_port;
 44
 45	return pqi_sas_phy;
 46}
 47
 48static void pqi_free_sas_phy(struct pqi_sas_phy *pqi_sas_phy)
 49{
 50	struct sas_phy *phy = pqi_sas_phy->phy;
 51
 52	sas_port_delete_phy(pqi_sas_phy->parent_port->port, phy);
 53	sas_phy_free(phy);
 54	if (pqi_sas_phy->added_to_port)
 55		list_del(&pqi_sas_phy->phy_list_entry);
 56	kfree(pqi_sas_phy);
 57}
 58
 59static int pqi_sas_port_add_phy(struct pqi_sas_phy *pqi_sas_phy)
 60{
 61	int rc;
 62	struct pqi_sas_port *pqi_sas_port;
 63	struct sas_phy *phy;
 64	struct sas_identify *identify;
 65
 66	pqi_sas_port = pqi_sas_phy->parent_port;
 67	phy = pqi_sas_phy->phy;
 68
 69	identify = &phy->identify;
 70	memset(identify, 0, sizeof(*identify));
 71	identify->sas_address = pqi_sas_port->sas_address;
 72	identify->device_type = SAS_END_DEVICE;
 73	identify->initiator_port_protocols = SAS_PROTOCOL_STP;
 74	identify->target_port_protocols = SAS_PROTOCOL_STP;
 75	phy->minimum_linkrate_hw = SAS_LINK_RATE_UNKNOWN;
 76	phy->maximum_linkrate_hw = SAS_LINK_RATE_UNKNOWN;
 77	phy->minimum_linkrate = SAS_LINK_RATE_UNKNOWN;
 78	phy->maximum_linkrate = SAS_LINK_RATE_UNKNOWN;
 79	phy->negotiated_linkrate = SAS_LINK_RATE_UNKNOWN;
 80
 81	rc = sas_phy_add(pqi_sas_phy->phy);
 82	if (rc)
 83		return rc;
 84
 85	sas_port_add_phy(pqi_sas_port->port, pqi_sas_phy->phy);
 86	list_add_tail(&pqi_sas_phy->phy_list_entry,
 87		&pqi_sas_port->phy_list_head);
 88	pqi_sas_phy->added_to_port = true;
 89
 90	return 0;
 91}
 92
 93static int pqi_sas_port_add_rphy(struct pqi_sas_port *pqi_sas_port,
 94	struct sas_rphy *rphy)
 95{
 96	struct sas_identify *identify;
 97
 98	identify = &rphy->identify;
 99	identify->sas_address = pqi_sas_port->sas_address;
100	identify->initiator_port_protocols = SAS_PROTOCOL_STP;
101	identify->target_port_protocols = SAS_PROTOCOL_STP;
102
103	return sas_rphy_add(rphy);
104}
105
106static struct pqi_sas_port *pqi_alloc_sas_port(
107	struct pqi_sas_node *pqi_sas_node, u64 sas_address)
108{
109	int rc;
110	struct pqi_sas_port *pqi_sas_port;
111	struct sas_port *port;
112
113	pqi_sas_port = kzalloc(sizeof(*pqi_sas_port), GFP_KERNEL);
114	if (!pqi_sas_port)
115		return NULL;
116
117	INIT_LIST_HEAD(&pqi_sas_port->phy_list_head);
118	pqi_sas_port->parent_node = pqi_sas_node;
119
120	port = sas_port_alloc_num(pqi_sas_node->parent_dev);
121	if (!port)
122		goto free_pqi_port;
123
124	rc = sas_port_add(port);
125	if (rc)
126		goto free_sas_port;
127
128	pqi_sas_port->port = port;
129	pqi_sas_port->sas_address = sas_address;
130	list_add_tail(&pqi_sas_port->port_list_entry,
131		&pqi_sas_node->port_list_head);
132
133	return pqi_sas_port;
134
135free_sas_port:
136	sas_port_free(port);
137free_pqi_port:
138	kfree(pqi_sas_port);
139
140	return NULL;
141}
142
143static void pqi_free_sas_port(struct pqi_sas_port *pqi_sas_port)
144{
145	struct pqi_sas_phy *pqi_sas_phy;
146	struct pqi_sas_phy *next;
147
148	list_for_each_entry_safe(pqi_sas_phy, next,
149			&pqi_sas_port->phy_list_head, phy_list_entry)
150		pqi_free_sas_phy(pqi_sas_phy);
151
152	sas_port_delete(pqi_sas_port->port);
153	list_del(&pqi_sas_port->port_list_entry);
154	kfree(pqi_sas_port);
155}
156
157static struct pqi_sas_node *pqi_alloc_sas_node(struct device *parent_dev)
158{
159	struct pqi_sas_node *pqi_sas_node;
160
161	pqi_sas_node = kzalloc(sizeof(*pqi_sas_node), GFP_KERNEL);
162	if (pqi_sas_node) {
163		pqi_sas_node->parent_dev = parent_dev;
164		INIT_LIST_HEAD(&pqi_sas_node->port_list_head);
165	}
166
167	return pqi_sas_node;
168}
169
170static void pqi_free_sas_node(struct pqi_sas_node *pqi_sas_node)
171{
172	struct pqi_sas_port *pqi_sas_port;
173	struct pqi_sas_port *next;
174
175	if (!pqi_sas_node)
176		return;
177
178	list_for_each_entry_safe(pqi_sas_port, next,
179			&pqi_sas_node->port_list_head, port_list_entry)
180		pqi_free_sas_port(pqi_sas_port);
181
182	kfree(pqi_sas_node);
183}
184
185struct pqi_scsi_dev *pqi_find_device_by_sas_rphy(
186	struct pqi_ctrl_info *ctrl_info, struct sas_rphy *rphy)
187{
188	struct pqi_scsi_dev *device;
189
190	list_for_each_entry(device, &ctrl_info->scsi_device_list,
191		scsi_device_list_entry) {
192		if (!device->sas_port)
193			continue;
194		if (device->sas_port->rphy == rphy)
195			return device;
196	}
197
198	return NULL;
199}
200
201int pqi_add_sas_host(struct Scsi_Host *shost, struct pqi_ctrl_info *ctrl_info)
202{
203	int rc;
204	struct device *parent_dev;
205	struct pqi_sas_node *pqi_sas_node;
206	struct pqi_sas_port *pqi_sas_port;
207	struct pqi_sas_phy *pqi_sas_phy;
208
209	parent_dev = &shost->shost_gendev;
210
211	pqi_sas_node = pqi_alloc_sas_node(parent_dev);
212	if (!pqi_sas_node)
213		return -ENOMEM;
214
215	pqi_sas_port = pqi_alloc_sas_port(pqi_sas_node, ctrl_info->sas_address);
216	if (!pqi_sas_port) {
217		rc = -ENODEV;
218		goto free_sas_node;
219	}
220
221	pqi_sas_phy = pqi_alloc_sas_phy(pqi_sas_port);
222	if (!pqi_sas_phy) {
223		rc = -ENODEV;
224		goto free_sas_port;
225	}
226
227	rc = pqi_sas_port_add_phy(pqi_sas_phy);
228	if (rc)
229		goto free_sas_phy;
230
231	ctrl_info->sas_host = pqi_sas_node;
232
233	return 0;
234
235free_sas_phy:
236	pqi_free_sas_phy(pqi_sas_phy);
237free_sas_port:
238	pqi_free_sas_port(pqi_sas_port);
239free_sas_node:
240	pqi_free_sas_node(pqi_sas_node);
241
242	return rc;
243}
244
245void pqi_delete_sas_host(struct pqi_ctrl_info *ctrl_info)
246{
247	pqi_free_sas_node(ctrl_info->sas_host);
248}
249
250int pqi_add_sas_device(struct pqi_sas_node *pqi_sas_node,
251	struct pqi_scsi_dev *device)
252{
253	int rc;
254	struct pqi_sas_port *pqi_sas_port;
255	struct sas_rphy *rphy;
256
257	pqi_sas_port = pqi_alloc_sas_port(pqi_sas_node, device->sas_address);
258	if (!pqi_sas_port)
259		return -ENOMEM;
260
261	rphy = sas_end_device_alloc(pqi_sas_port->port);
262	if (!rphy) {
263		rc = -ENODEV;
264		goto free_sas_port;
265	}
266
267	pqi_sas_port->rphy = rphy;
268	device->sas_port = pqi_sas_port;
269
270	rc = pqi_sas_port_add_rphy(pqi_sas_port, rphy);
271	if (rc)
272		goto free_sas_port;
273
274	return 0;
275
276free_sas_port:
277	pqi_free_sas_port(pqi_sas_port);
278	device->sas_port = NULL;
279
280	return rc;
281}
282
283void pqi_remove_sas_device(struct pqi_scsi_dev *device)
284{
285	if (device->sas_port) {
286		pqi_free_sas_port(device->sas_port);
287		device->sas_port = NULL;
288	}
289}
290
291static int pqi_sas_get_linkerrors(struct sas_phy *phy)
292{
293	return 0;
294}
295
296static int pqi_sas_get_enclosure_identifier(struct sas_rphy *rphy,
297	u64 *identifier)
298{
299	return 0;
300}
301
302static int pqi_sas_get_bay_identifier(struct sas_rphy *rphy)
303{
304	return -ENXIO;
305}
306
307static int pqi_sas_phy_reset(struct sas_phy *phy, int hard_reset)
308{
309	return 0;
310}
311
312static int pqi_sas_phy_enable(struct sas_phy *phy, int enable)
313{
314	return 0;
315}
316
317static int pqi_sas_phy_setup(struct sas_phy *phy)
318{
319	return 0;
320}
321
322static void pqi_sas_phy_release(struct sas_phy *phy)
323{
324}
325
326static int pqi_sas_phy_speed(struct sas_phy *phy,
327	struct sas_phy_linkrates *rates)
328{
329	return -EINVAL;
330}
331
332struct sas_function_template pqi_sas_transport_functions = {
333	.get_linkerrors = pqi_sas_get_linkerrors,
334	.get_enclosure_identifier = pqi_sas_get_enclosure_identifier,
335	.get_bay_identifier = pqi_sas_get_bay_identifier,
336	.phy_reset = pqi_sas_phy_reset,
337	.phy_enable = pqi_sas_phy_enable,
338	.phy_setup = pqi_sas_phy_setup,
339	.phy_release = pqi_sas_phy_release,
340	.set_phy_speed = pqi_sas_phy_speed,
341};