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1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
3  *
4  * Copyright (c) 2019 Ruslan Bukin <br@bsdpad.com>
5  *
6  * This software was developed by SRI International and the University of
7  * Cambridge Computer Laboratory (Department of Computer Science and
8  * Technology) under DARPA contract HR0011-18-C-0016 ("ECATS"), as part of the
9  * DARPA SSITH research programme.
10  *
11  * Redistribution and use in source and binary forms, with or without
12  * modification, are permitted provided that the following conditions
13  * are met:
14  * 1. Redistributions of source code must retain the above copyright
15  *    notice, this list of conditions and the following disclaimer.
16  * 2. Redistributions in binary form must reproduce the above copyright
17  *    notice, this list of conditions and the following disclaimer in the
18  *    documentation and/or other materials provided with the distribution.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30  * SUCH DAMAGE.
31  */
32
33 /*
34  * Intel Stratix 10 FPGA Manager.
35  */
36
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
39
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/bus.h>
43 #include <sys/kernel.h>
44 #include <sys/module.h>
45 #include <sys/malloc.h>
46 #include <sys/rman.h>
47 #include <sys/timeet.h>
48 #include <sys/timetc.h>
49 #include <sys/conf.h>
50 #include <sys/uio.h>
51 #include <sys/sx.h>
52
53 #include <dev/ofw/openfirm.h>
54 #include <dev/ofw/ofw_bus.h>
55 #include <dev/ofw/ofw_bus_subr.h>
56
57 #include <arm64/intel/stratix10-svc.h>
58
59 #include <machine/bus.h>
60 #include <machine/cpu.h>
61 #include <machine/intr.h>
62
63 #define SVC_BUF_SIZE    (2 * 1024 * 1024)
64
65 struct fpgamgr_s10_softc {
66         struct cdev             *mgr_cdev;
67         struct cdev             *mgr_cdev_partial;
68         device_t                dev;
69         device_t                s10_svc_dev;
70         struct s10_svc_mem      mem;
71         struct sx               sx;
72         int                     opened;
73 };
74
75 static int
76 fpga_open(struct cdev *dev, int flags __unused,
77     int fmt __unused, struct thread *td __unused)
78 {
79         struct fpgamgr_s10_softc *sc;
80         struct s10_svc_msg msg;
81         int ret;
82         int err;
83
84         sc = dev->si_drv1;
85
86         sx_xlock(&sc->sx);
87         if (sc->opened) {
88                 sx_xunlock(&sc->sx);
89                 return (EBUSY);
90         }
91
92         err = s10_svc_allocate_memory(sc->s10_svc_dev,
93             &sc->mem, SVC_BUF_SIZE);
94         if (err != 0) {
95                 sx_xunlock(&sc->sx);
96                 return (ENXIO);
97         }
98
99         bzero(&msg, sizeof(struct s10_svc_msg));
100         msg.command = COMMAND_RECONFIG;
101         if (dev == sc->mgr_cdev_partial)
102                 msg.flags |= COMMAND_RECONFIG_FLAG_PARTIAL;
103         ret = s10_svc_send(sc->s10_svc_dev, &msg);
104         if (ret != 0) {
105                 sx_xunlock(&sc->sx);
106                 return (ENXIO);
107         }
108
109         sc->opened = 1;
110         sx_xunlock(&sc->sx);
111
112         return (0);
113 }
114
115 static int
116 fpga_write(struct cdev *dev, struct uio *uio, int ioflag)
117 {
118         struct fpgamgr_s10_softc *sc;
119         vm_offset_t addr;
120         int amnt;
121
122         sc = dev->si_drv1;
123
124         sx_xlock(&sc->sx);
125         if (sc->opened == 0) {
126                 /* Device closed. */
127                 sx_xunlock(&sc->sx);
128                 return (ENXIO);
129         }
130
131         while (uio->uio_resid > 0) {
132                 addr = sc->mem.vaddr + sc->mem.fill;
133                 if (sc->mem.fill >= SVC_BUF_SIZE)
134                         return (ENOMEM);
135                 amnt = MIN(uio->uio_resid, (SVC_BUF_SIZE - sc->mem.fill));
136                 uiomove((void *)addr, amnt, uio);
137                 sc->mem.fill += amnt;
138         }
139
140         sx_xunlock(&sc->sx);
141
142         return (0);
143 }
144
145 static int
146 fpga_close(struct cdev *dev, int flags __unused,
147     int fmt __unused, struct thread *td __unused)
148 {
149         struct fpgamgr_s10_softc *sc;
150         struct s10_svc_msg msg;
151         int ret;
152
153         sc = dev->si_drv1;
154
155         sx_xlock(&sc->sx);
156         if (sc->opened == 0) {
157                 /* Device closed. */
158                 sx_xunlock(&sc->sx);
159                 return (ENXIO);
160         }
161
162         /* Submit bitstream */
163         bzero(&msg, sizeof(struct s10_svc_msg));
164         msg.command = COMMAND_RECONFIG_DATA_SUBMIT;
165         msg.payload = (void *)sc->mem.paddr;
166         msg.payload_length = sc->mem.fill;
167         ret = s10_svc_send(sc->s10_svc_dev, &msg);
168         if (ret != 0) {
169                 device_printf(sc->dev, "Failed to submit data\n");
170                 s10_svc_free_memory(sc->s10_svc_dev, &sc->mem);
171                 sc->opened = 0;
172                 sx_xunlock(&sc->sx);
173                 return (0);
174         }
175
176         /* Claim memory buffer back */
177         bzero(&msg, sizeof(struct s10_svc_msg));
178         msg.command = COMMAND_RECONFIG_DATA_CLAIM;
179         s10_svc_send(sc->s10_svc_dev, &msg);
180
181         s10_svc_free_memory(sc->s10_svc_dev, &sc->mem);
182         sc->opened = 0;
183         sx_xunlock(&sc->sx);
184
185         return (0);
186 }
187
188 static int
189 fpga_ioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags,
190     struct thread *td)
191 {
192
193         return (0);
194 }
195
196 static struct cdevsw fpga_cdevsw = {
197         .d_version =    D_VERSION,
198         .d_open =       fpga_open,
199         .d_close =      fpga_close,
200         .d_write =      fpga_write,
201         .d_ioctl =      fpga_ioctl,
202         .d_name =       "FPGA Manager",
203 };
204
205 static int
206 fpgamgr_s10_probe(device_t dev)
207 {
208
209         if (!ofw_bus_status_okay(dev))
210                 return (ENXIO);
211
212         if (!ofw_bus_is_compatible(dev, "intel,stratix10-soc-fpga-mgr"))
213                 return (ENXIO);
214
215         device_set_desc(dev, "Stratix 10 SOC FPGA Manager");
216
217         return (BUS_PROBE_DEFAULT);
218 }
219
220 static int
221 fpgamgr_s10_attach(device_t dev)
222 {
223         struct fpgamgr_s10_softc *sc;
224         devclass_t dc;
225
226         sc = device_get_softc(dev);
227         sc->dev = dev;
228
229         dc = devclass_find("s10_svc");
230         if (dc == NULL)
231                 return (ENXIO);
232
233         sc->s10_svc_dev = devclass_get_device(dc, 0);
234         if (sc->s10_svc_dev == NULL)
235                 return (ENXIO);
236
237         sc->mgr_cdev = make_dev(&fpga_cdevsw, 0, UID_ROOT, GID_WHEEL,
238             0600, "fpga%d", device_get_unit(sc->dev));
239         if (sc->mgr_cdev == NULL) {
240                 device_printf(dev, "Failed to create character device.\n");
241                 return (ENXIO);
242         }
243
244         sc->mgr_cdev_partial = make_dev(&fpga_cdevsw, 0, UID_ROOT, GID_WHEEL,
245             0600, "fpga_partial%d", device_get_unit(sc->dev));
246         if (sc->mgr_cdev_partial == NULL) {
247                 device_printf(dev, "Failed to create character device.\n");
248                 return (ENXIO);
249         }
250
251         sx_init(&sc->sx, "s10 fpga");
252
253         sc->mgr_cdev->si_drv1 = sc;
254         sc->mgr_cdev_partial->si_drv1 = sc;
255
256         return (0);
257 }
258
259 static int
260 fpgamgr_s10_detach(device_t dev)
261 {
262         struct fpgamgr_s10_softc *sc;
263
264         sc = device_get_softc(dev);
265
266         destroy_dev(sc->mgr_cdev);
267         destroy_dev(sc->mgr_cdev_partial);
268
269         sx_destroy(&sc->sx);
270
271         return (0);
272 }
273
274 static device_method_t fpgamgr_s10_methods[] = {
275         DEVMETHOD(device_probe,         fpgamgr_s10_probe),
276         DEVMETHOD(device_attach,        fpgamgr_s10_attach),
277         DEVMETHOD(device_detach,        fpgamgr_s10_detach),
278         { 0, 0 }
279 };
280
281 static driver_t fpgamgr_s10_driver = {
282         "fpgamgr_s10",
283         fpgamgr_s10_methods,
284         sizeof(struct fpgamgr_s10_softc),
285 };
286
287 static devclass_t fpgamgr_s10_devclass;
288
289 DRIVER_MODULE(fpgamgr_s10, simplebus, fpgamgr_s10_driver,
290     fpgamgr_s10_devclass, 0, 0);