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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 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/bus.h>
41 #include <sys/kernel.h>
42 #include <sys/module.h>
43 #include <sys/malloc.h>
44 #include <sys/rman.h>
45 #include <sys/timeet.h>
46 #include <sys/timetc.h>
47 #include <sys/conf.h>
48 #include <sys/uio.h>
49 #include <sys/sx.h>
50
51 #include <dev/ofw/openfirm.h>
52 #include <dev/ofw/ofw_bus.h>
53 #include <dev/ofw/ofw_bus_subr.h>
54
55 #include <arm64/intel/stratix10-svc.h>
56
57 #include <machine/bus.h>
58 #include <machine/cpu.h>
59 #include <machine/intr.h>
60
61 #define SVC_BUF_SIZE    (2 * 1024 * 1024)
62
63 struct fpgamgr_s10_softc {
64         struct cdev             *mgr_cdev;
65         struct cdev             *mgr_cdev_partial;
66         device_t                dev;
67         device_t                s10_svc_dev;
68         struct s10_svc_mem      mem;
69         struct sx               sx;
70         int                     opened;
71 };
72
73 static int
74 fpga_open(struct cdev *dev, int flags __unused,
75     int fmt __unused, struct thread *td __unused)
76 {
77         struct fpgamgr_s10_softc *sc;
78         struct s10_svc_msg msg;
79         int ret;
80         int err;
81
82         sc = dev->si_drv1;
83
84         sx_xlock(&sc->sx);
85         if (sc->opened) {
86                 sx_xunlock(&sc->sx);
87                 return (EBUSY);
88         }
89
90         err = s10_svc_allocate_memory(sc->s10_svc_dev,
91             &sc->mem, SVC_BUF_SIZE);
92         if (err != 0) {
93                 sx_xunlock(&sc->sx);
94                 return (ENXIO);
95         }
96
97         bzero(&msg, sizeof(struct s10_svc_msg));
98         msg.command = COMMAND_RECONFIG;
99         if (dev == sc->mgr_cdev_partial)
100                 msg.flags |= COMMAND_RECONFIG_FLAG_PARTIAL;
101         ret = s10_svc_send(sc->s10_svc_dev, &msg);
102         if (ret != 0) {
103                 sx_xunlock(&sc->sx);
104                 return (ENXIO);
105         }
106
107         sc->opened = 1;
108         sx_xunlock(&sc->sx);
109
110         return (0);
111 }
112
113 static int
114 fpga_write(struct cdev *dev, struct uio *uio, int ioflag)
115 {
116         struct fpgamgr_s10_softc *sc;
117         vm_offset_t addr;
118         int amnt;
119
120         sc = dev->si_drv1;
121
122         sx_xlock(&sc->sx);
123         if (sc->opened == 0) {
124                 /* Device closed. */
125                 sx_xunlock(&sc->sx);
126                 return (ENXIO);
127         }
128
129         while (uio->uio_resid > 0) {
130                 addr = sc->mem.vaddr + sc->mem.fill;
131                 if (sc->mem.fill >= SVC_BUF_SIZE)
132                         return (ENOMEM);
133                 amnt = MIN(uio->uio_resid, (SVC_BUF_SIZE - sc->mem.fill));
134                 uiomove((void *)addr, amnt, uio);
135                 sc->mem.fill += amnt;
136         }
137
138         sx_xunlock(&sc->sx);
139
140         return (0);
141 }
142
143 static int
144 fpga_close(struct cdev *dev, int flags __unused,
145     int fmt __unused, struct thread *td __unused)
146 {
147         struct fpgamgr_s10_softc *sc;
148         struct s10_svc_msg msg;
149         int ret;
150
151         sc = dev->si_drv1;
152
153         sx_xlock(&sc->sx);
154         if (sc->opened == 0) {
155                 /* Device closed. */
156                 sx_xunlock(&sc->sx);
157                 return (ENXIO);
158         }
159
160         /* Submit bitstream */
161         bzero(&msg, sizeof(struct s10_svc_msg));
162         msg.command = COMMAND_RECONFIG_DATA_SUBMIT;
163         msg.payload = (void *)sc->mem.paddr;
164         msg.payload_length = sc->mem.fill;
165         ret = s10_svc_send(sc->s10_svc_dev, &msg);
166         if (ret != 0) {
167                 device_printf(sc->dev, "Failed to submit data\n");
168                 s10_svc_free_memory(sc->s10_svc_dev, &sc->mem);
169                 sc->opened = 0;
170                 sx_xunlock(&sc->sx);
171                 return (0);
172         }
173
174         /* Claim memory buffer back */
175         bzero(&msg, sizeof(struct s10_svc_msg));
176         msg.command = COMMAND_RECONFIG_DATA_CLAIM;
177         s10_svc_send(sc->s10_svc_dev, &msg);
178
179         s10_svc_free_memory(sc->s10_svc_dev, &sc->mem);
180         sc->opened = 0;
181         sx_xunlock(&sc->sx);
182
183         return (0);
184 }
185
186 static int
187 fpga_ioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags,
188     struct thread *td)
189 {
190
191         return (0);
192 }
193
194 static struct cdevsw fpga_cdevsw = {
195         .d_version =    D_VERSION,
196         .d_open =       fpga_open,
197         .d_close =      fpga_close,
198         .d_write =      fpga_write,
199         .d_ioctl =      fpga_ioctl,
200         .d_name =       "FPGA Manager",
201 };
202
203 static int
204 fpgamgr_s10_probe(device_t dev)
205 {
206
207         if (!ofw_bus_status_okay(dev))
208                 return (ENXIO);
209
210         if (!ofw_bus_is_compatible(dev, "intel,stratix10-soc-fpga-mgr"))
211                 return (ENXIO);
212
213         device_set_desc(dev, "Stratix 10 SOC FPGA Manager");
214
215         return (BUS_PROBE_DEFAULT);
216 }
217
218 static int
219 fpgamgr_s10_attach(device_t dev)
220 {
221         struct fpgamgr_s10_softc *sc;
222         devclass_t dc;
223
224         sc = device_get_softc(dev);
225         sc->dev = dev;
226
227         dc = devclass_find("s10_svc");
228         if (dc == NULL)
229                 return (ENXIO);
230
231         sc->s10_svc_dev = devclass_get_device(dc, 0);
232         if (sc->s10_svc_dev == NULL)
233                 return (ENXIO);
234
235         sc->mgr_cdev = make_dev(&fpga_cdevsw, 0, UID_ROOT, GID_WHEEL,
236             0600, "fpga%d", device_get_unit(sc->dev));
237         if (sc->mgr_cdev == NULL) {
238                 device_printf(dev, "Failed to create character device.\n");
239                 return (ENXIO);
240         }
241
242         sc->mgr_cdev_partial = make_dev(&fpga_cdevsw, 0, UID_ROOT, GID_WHEEL,
243             0600, "fpga_partial%d", device_get_unit(sc->dev));
244         if (sc->mgr_cdev_partial == NULL) {
245                 device_printf(dev, "Failed to create character device.\n");
246                 return (ENXIO);
247         }
248
249         sx_init(&sc->sx, "s10 fpga");
250
251         sc->mgr_cdev->si_drv1 = sc;
252         sc->mgr_cdev_partial->si_drv1 = sc;
253
254         return (0);
255 }
256
257 static int
258 fpgamgr_s10_detach(device_t dev)
259 {
260         struct fpgamgr_s10_softc *sc;
261
262         sc = device_get_softc(dev);
263
264         destroy_dev(sc->mgr_cdev);
265         destroy_dev(sc->mgr_cdev_partial);
266
267         sx_destroy(&sc->sx);
268
269         return (0);
270 }
271
272 static device_method_t fpgamgr_s10_methods[] = {
273         DEVMETHOD(device_probe,         fpgamgr_s10_probe),
274         DEVMETHOD(device_attach,        fpgamgr_s10_attach),
275         DEVMETHOD(device_detach,        fpgamgr_s10_detach),
276         { 0, 0 }
277 };
278
279 static driver_t fpgamgr_s10_driver = {
280         "fpgamgr_s10",
281         fpgamgr_s10_methods,
282         sizeof(struct fpgamgr_s10_softc),
283 };
284
285 DRIVER_MODULE(fpgamgr_s10, simplebus, fpgamgr_s10_driver, 0, 0);