1 /*-
2 * Copyright (c) 2015,2016 Annapurna Labs Ltd. and affiliates
3 * All rights reserved.
4 *
5 * Developed by Semihalf.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/param.h>
30 #include <sys/systm.h>
31 #include <sys/kernel.h>
32 #include <sys/module.h>
33 #include <sys/bus.h>
34 #include <sys/rman.h>
35 #include <sys/conf.h>
36 #include <sys/resource.h>
37
38 #include <machine/bus.h>
39 #include <dev/ofw/ofw_bus_subr.h>
40
41 #include "al_serdes.h"
42 #include "alpine_serdes.h"
43
44 #define SERDES_NUM_GROUPS 5
45
46 static void *serdes_base;
47 static uint32_t serdes_grp_offset[] = {0, 0x400, 0x800, 0xc00, 0x2000};
48
49 static struct alpine_serdes_eth_group_mode {
50 struct mtx lock;
51 enum alpine_serdes_eth_mode mode;
52 bool mode_set;
53 } alpine_serdes_eth_group_mode[SERDES_NUM_GROUPS];
54
55 static int al_serdes_probe(device_t dev);
56 static int al_serdes_attach(device_t dev);
57 static int al_serdes_detach(device_t dev);
58
59 static struct resource_spec al_serdes_spec[] = {
60 { SYS_RES_MEMORY, 0, RF_ACTIVE },
61 { -1, 0 }
62 };
63
64 struct al_serdes_softc {
65 struct resource *res;
66 };
67
68 static device_method_t al_serdes_methods[] = {
69 DEVMETHOD(device_probe, al_serdes_probe),
70 DEVMETHOD(device_attach, al_serdes_attach),
71 DEVMETHOD(device_detach, al_serdes_detach),
72
73 DEVMETHOD_END
74 };
75
76 static driver_t al_serdes_driver = {
77 "serdes",
78 al_serdes_methods,
79 sizeof(struct al_serdes_softc)
80 };
81
82 DRIVER_MODULE(al_serdes, simplebus, al_serdes_driver, 0, 0);
83 DRIVER_MODULE(al_serdes, ofwbus, al_serdes_driver, 0, 0);
84
85 static int
al_serdes_probe(device_t dev)86 al_serdes_probe(device_t dev)
87 {
88
89 if (!ofw_bus_status_okay(dev))
90 return (ENXIO);
91
92 if (!ofw_bus_is_compatible(dev, "annapurna-labs,al-serdes"))
93 return (ENXIO);
94
95 device_set_desc(dev, "Alpine Serdes");
96
97 return (BUS_PROBE_DEFAULT);
98 }
99
100 static int
al_serdes_attach(device_t dev)101 al_serdes_attach(device_t dev)
102 {
103 struct al_serdes_softc *sc;
104 int err;
105
106 sc = device_get_softc(dev);
107
108 err = bus_alloc_resources(dev, al_serdes_spec, &sc->res);
109 if (err != 0) {
110 device_printf(dev, "could not allocate resources\n");
111 return (err);
112 }
113
114 /* Initialize Serdes group locks and mode */
115 for (int i = 0; i < nitems(alpine_serdes_eth_group_mode); i++) {
116 mtx_init(&alpine_serdes_eth_group_mode[i].lock, "AlSerdesMtx",
117 NULL, MTX_DEF);
118 alpine_serdes_eth_group_mode[i].mode_set = false;
119 }
120
121 serdes_base = (void *)rman_get_bushandle(sc->res);
122
123 return (0);
124 }
125
126 static int
al_serdes_detach(device_t dev)127 al_serdes_detach(device_t dev)
128 {
129 struct al_serdes_softc *sc;
130
131 sc = device_get_softc(dev);
132
133 bus_release_resources(dev, al_serdes_spec, &sc->res);
134
135 for (int i = 0; i < nitems(alpine_serdes_eth_group_mode); i++) {
136 mtx_destroy(&alpine_serdes_eth_group_mode[i].lock);
137 alpine_serdes_eth_group_mode[i].mode_set = false;
138 }
139
140 return (0);
141 }
142
143 void *
alpine_serdes_resource_get(uint32_t group)144 alpine_serdes_resource_get(uint32_t group)
145 {
146 void *base;
147
148 base = NULL;
149 if (group >= SERDES_NUM_GROUPS)
150 return (NULL);
151
152 if (serdes_base != NULL)
153 base = (void *)((uintptr_t)serdes_base +
154 serdes_grp_offset[group]);
155
156 return (base);
157 }
158
159 int
alpine_serdes_eth_mode_set(uint32_t group,enum alpine_serdes_eth_mode mode)160 alpine_serdes_eth_mode_set(uint32_t group, enum alpine_serdes_eth_mode mode)
161 {
162 struct alpine_serdes_eth_group_mode *group_mode;
163
164 group_mode = &alpine_serdes_eth_group_mode[group];
165
166 if (serdes_base == NULL)
167 return (EINVAL);
168
169 if (group >= SERDES_NUM_GROUPS)
170 return (EINVAL);
171
172 mtx_lock(&group_mode->lock);
173
174 if (!group_mode->mode_set || (group_mode->mode != mode)) {
175 struct al_serdes_grp_obj obj;
176
177 al_serdes_handle_grp_init(alpine_serdes_resource_get(group),
178 group, &obj);
179
180 if (mode == ALPINE_SERDES_ETH_MODE_SGMII)
181 obj.mode_set_sgmii(&obj);
182 else
183 obj.mode_set_kr(&obj);
184
185 group_mode->mode = mode;
186 group_mode->mode_set = true;
187 }
188
189 mtx_unlock(&group_mode->lock);
190
191 return (0);
192 }
193
194 void
alpine_serdes_eth_group_lock(uint32_t group)195 alpine_serdes_eth_group_lock(uint32_t group)
196 {
197 struct alpine_serdes_eth_group_mode *group_mode;
198
199 group_mode = &alpine_serdes_eth_group_mode[group];
200
201 if (mtx_initialized(&group_mode->lock) == 0)
202 return;
203
204 mtx_lock(&group_mode->lock);
205 }
206
207 void
alpine_serdes_eth_group_unlock(uint32_t group)208 alpine_serdes_eth_group_unlock(uint32_t group)
209 {
210 struct alpine_serdes_eth_group_mode *group_mode;
211
212 group_mode = &alpine_serdes_eth_group_mode[group];
213
214 if (mtx_initialized(&group_mode->lock) == 0)
215 return;
216
217 mtx_unlock(&group_mode->lock);
218 }
219