drm/panthor: Don't add write fences to the shared BOs
[drm/drm-misc.git] / samples / timers / hpet_example.c
blobf1cb622f6ec076e646b563267ec9b68dae137c47
1 // SPDX-License-Identifier: GPL-2.0
2 #include <stdio.h>
3 #include <stdlib.h>
4 #include <unistd.h>
5 #include <fcntl.h>
6 #include <string.h>
7 #include <memory.h>
8 #include <malloc.h>
9 #include <time.h>
10 #include <ctype.h>
11 #include <sys/types.h>
12 #include <sys/wait.h>
13 #include <signal.h>
14 #include <errno.h>
15 #include <sys/time.h>
16 #include <linux/hpet.h>
19 extern void hpet_open_close(int, const char **);
20 extern void hpet_info(int, const char **);
21 extern void hpet_poll(int, const char **);
22 extern void hpet_fasync(int, const char **);
23 extern void hpet_read(int, const char **);
25 #include <sys/poll.h>
26 #include <sys/ioctl.h>
28 struct hpet_command {
29 char *command;
30 void (*func)(int argc, const char ** argv);
31 } hpet_command[] = {
33 "open-close",
34 hpet_open_close
37 "info",
38 hpet_info
41 "poll",
42 hpet_poll
45 "fasync",
46 hpet_fasync
50 int
51 main(int argc, const char ** argv)
53 unsigned int i;
55 argc--;
56 argv++;
58 if (!argc) {
59 fprintf(stderr, "-hpet: requires command\n");
60 return -1;
64 for (i = 0; i < (sizeof (hpet_command) / sizeof (hpet_command[0])); i++)
65 if (!strcmp(argv[0], hpet_command[i].command)) {
66 argc--;
67 argv++;
68 fprintf(stderr, "-hpet: executing %s\n",
69 hpet_command[i].command);
70 hpet_command[i].func(argc, argv);
71 return 0;
74 fprintf(stderr, "do_hpet: command %s not implemented\n", argv[0]);
76 return -1;
79 void
80 hpet_open_close(int argc, const char **argv)
82 int fd;
84 if (argc != 1) {
85 fprintf(stderr, "hpet_open_close: device-name\n");
86 return;
89 fd = open(argv[0], O_RDONLY);
90 if (fd < 0)
91 fprintf(stderr, "hpet_open_close: open failed\n");
92 else
93 close(fd);
95 return;
98 void
99 hpet_info(int argc, const char **argv)
101 struct hpet_info info;
102 int fd;
104 if (argc != 1) {
105 fprintf(stderr, "hpet_info: device-name\n");
106 return;
109 fd = open(argv[0], O_RDONLY);
110 if (fd < 0) {
111 fprintf(stderr, "hpet_info: open of %s failed\n", argv[0]);
112 return;
115 if (ioctl(fd, HPET_INFO, &info) < 0) {
116 fprintf(stderr, "hpet_info: failed to get info\n");
117 goto out;
120 fprintf(stderr, "hpet_info: hi_irqfreq 0x%lx hi_flags 0x%lx ",
121 info.hi_ireqfreq, info.hi_flags);
122 fprintf(stderr, "hi_hpet %d hi_timer %d\n",
123 info.hi_hpet, info.hi_timer);
125 out:
126 close(fd);
127 return;
130 void
131 hpet_poll(int argc, const char **argv)
133 unsigned long freq;
134 int iterations, i, fd;
135 struct pollfd pfd;
136 struct hpet_info info;
137 struct timeval stv, etv;
138 struct timezone tz;
139 long usec;
141 if (argc != 3) {
142 fprintf(stderr, "hpet_poll: device-name freq iterations\n");
143 return;
146 freq = atoi(argv[1]);
147 iterations = atoi(argv[2]);
149 fd = open(argv[0], O_RDONLY);
151 if (fd < 0) {
152 fprintf(stderr, "hpet_poll: open of %s failed\n", argv[0]);
153 return;
156 if (ioctl(fd, HPET_IRQFREQ, freq) < 0) {
157 fprintf(stderr, "hpet_poll: HPET_IRQFREQ failed\n");
158 goto out;
161 if (ioctl(fd, HPET_INFO, &info) < 0) {
162 fprintf(stderr, "hpet_poll: failed to get info\n");
163 goto out;
166 fprintf(stderr, "hpet_poll: info.hi_flags 0x%lx\n", info.hi_flags);
168 if (info.hi_flags && (ioctl(fd, HPET_EPI, 0) < 0)) {
169 fprintf(stderr, "hpet_poll: HPET_EPI failed\n");
170 goto out;
173 if (ioctl(fd, HPET_IE_ON, 0) < 0) {
174 fprintf(stderr, "hpet_poll, HPET_IE_ON failed\n");
175 goto out;
178 pfd.fd = fd;
179 pfd.events = POLLIN;
181 for (i = 0; i < iterations; i++) {
182 pfd.revents = 0;
183 gettimeofday(&stv, &tz);
184 if (poll(&pfd, 1, -1) < 0)
185 fprintf(stderr, "hpet_poll: poll failed\n");
186 else {
187 long data;
189 gettimeofday(&etv, &tz);
190 usec = stv.tv_sec * 1000000 + stv.tv_usec;
191 usec = (etv.tv_sec * 1000000 + etv.tv_usec) - usec;
193 fprintf(stderr,
194 "hpet_poll: expired time = 0x%lx\n", usec);
196 fprintf(stderr, "hpet_poll: revents = 0x%x\n",
197 pfd.revents);
199 if (read(fd, &data, sizeof(data)) != sizeof(data)) {
200 fprintf(stderr, "hpet_poll: read failed\n");
202 else
203 fprintf(stderr, "hpet_poll: data 0x%lx\n",
204 data);
208 out:
209 close(fd);
210 return;
213 static int hpet_sigio_count;
215 static void
216 hpet_sigio(int val)
218 fprintf(stderr, "hpet_sigio: called\n");
219 hpet_sigio_count++;
222 void
223 hpet_fasync(int argc, const char **argv)
225 unsigned long freq;
226 int iterations, i, fd, value;
227 sig_t oldsig;
228 struct hpet_info info;
230 hpet_sigio_count = 0;
231 fd = -1;
233 if ((oldsig = signal(SIGIO, hpet_sigio)) == SIG_ERR) {
234 fprintf(stderr, "hpet_fasync: failed to set signal handler\n");
235 return;
238 if (argc != 3) {
239 fprintf(stderr, "hpet_fasync: device-name freq iterations\n");
240 goto out;
243 fd = open(argv[0], O_RDONLY);
245 if (fd < 0) {
246 fprintf(stderr, "hpet_fasync: failed to open %s\n", argv[0]);
247 return;
251 if ((fcntl(fd, F_SETOWN, getpid()) == 1) ||
252 ((value = fcntl(fd, F_GETFL)) == 1) ||
253 (fcntl(fd, F_SETFL, value | O_ASYNC) == 1)) {
254 fprintf(stderr, "hpet_fasync: fcntl failed\n");
255 goto out;
258 freq = atoi(argv[1]);
259 iterations = atoi(argv[2]);
261 if (ioctl(fd, HPET_IRQFREQ, freq) < 0) {
262 fprintf(stderr, "hpet_fasync: HPET_IRQFREQ failed\n");
263 goto out;
266 if (ioctl(fd, HPET_INFO, &info) < 0) {
267 fprintf(stderr, "hpet_fasync: failed to get info\n");
268 goto out;
271 fprintf(stderr, "hpet_fasync: info.hi_flags 0x%lx\n", info.hi_flags);
273 if (info.hi_flags && (ioctl(fd, HPET_EPI, 0) < 0)) {
274 fprintf(stderr, "hpet_fasync: HPET_EPI failed\n");
275 goto out;
278 if (ioctl(fd, HPET_IE_ON, 0) < 0) {
279 fprintf(stderr, "hpet_fasync, HPET_IE_ON failed\n");
280 goto out;
283 for (i = 0; i < iterations; i++) {
284 (void) pause();
285 fprintf(stderr, "hpet_fasync: count = %d\n", hpet_sigio_count);
288 out:
289 signal(SIGIO, oldsig);
291 if (fd >= 0)
292 close(fd);
294 return;