uart.c revision 1.1 1 /* $NetBSD: uart.c,v 1.1 2007/03/20 08:52:02 dyoung Exp $ */
2
3 /*-
4 * Copyright (c) 2007 Ruslan Ermilov and Vsevolod Lobko.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or
8 * without modification, are permitted provided that the following
9 * conditions 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
13 * copyright notice, this list of conditions and the following
14 * disclaimer in the documentation and/or other materials provided
15 * with the distribution.
16 * 3. The names of the authors may not be used to endorse or promote
17 * products derived from this software without specific prior
18 * written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY
21 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
22 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
23 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
25 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
26 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
27 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
29 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
30 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
31 * OF SUCH DAMAGE.
32 */
33
34 #include <sys/cdefs.h>
35 __KERNEL_RCSID(0, "$NetBSD: uart.c,v 1.1 2007/03/20 08:52:02 dyoung Exp $");
36
37 #include <sys/types.h>
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/kernel.h>
41 #include <sys/time.h>
42 #include <sys/device.h>
43
44 #include <sys/proc.h>
45 #include <sys/user.h>
46 #include <sys/buf.h>
47 #include <sys/ioctl.h>
48 #include <sys/kauth.h>
49 #include <sys/tty.h>
50 #include <sys/file.h>
51 #include <sys/conf.h>
52 #include <sys/vnode.h>
53
54 #include <machine/intr.h>
55 #include <machine/bus.h>
56
57 #include <mips/adm5120/include/adm5120var.h>
58 #include <mips/adm5120/include/adm5120_obiovar.h>
59 #include <dev/cons.h>
60 #include <mips/adm5120/dev/uart.h>
61
62 #define REG_READ(o) bus_space_read_4(sc->sc_st, sc->sc_ioh, (o))
63 #define REG_WRITE(o,v) bus_space_write_4(sc->sc_st, sc->sc_ioh, (o),(v))
64
65 cons_decl(uart_);
66
67 extern struct consdev *cn_tab; /* physical console device info */
68
69 dev_type_open(uart_open);
70 dev_type_open(uart_close);
71 dev_type_read(uart_read);
72 dev_type_write(uart_write);
73 dev_type_ioctl(uart_ioctl);
74 dev_type_tty(uart_tty);
75 dev_type_poll(uart_poll);
76 dev_type_stop(uart_stop);
77
78 const struct cdevsw uart_cdevsw = {
79 uart_open, uart_close, uart_read, uart_write, uart_ioctl,
80 uart_stop, uart_tty, uart_poll, nommap, ttykqfilter, D_TTY
81 };
82
83
84 struct consdev uartcons = {
85 NULL, NULL, uart_cngetc, uart_cnputc, uart_cnpollc, NULL, NULL, NULL,
86 NODEV, CN_NORMAL
87 };
88
89 struct uart_softc {
90 struct device sc_dev;
91 struct tty *sc_tty;
92
93 bus_space_tag_t sc_st;
94 bus_space_handle_t sc_ioh;
95 void *sc_ih;
96 };
97
98 extern struct cfdriver uart_cd;
99 static int uart_consattached;
100
101 static int uart_probe (struct device *, struct cfdata *, void *);
102 static void uart_attach (struct device *, struct device *, void *);
103
104 void uart_start(struct tty *);
105 int uart_param(struct tty *, struct termios *);
106 int uart_intr(void *);
107
108 CFATTACH_DECL(uart, sizeof(struct uart_softc),
109 uart_probe, uart_attach, NULL, NULL);
110
111 static int
112 uart_probe(struct device *parent, struct cfdata *cf, void *aux)
113 {
114 struct obio_attach_args *aa = aux;
115
116 if (strcmp(aa->oba_name, cf->cf_name) == 0)
117 return (1);
118
119 return (0);
120 }
121
122 static void
123 uart_attach(struct device *parent, struct device *self, void *aux)
124 {
125 struct obio_attach_args *oba = aux;
126 struct uart_softc *sc = (struct uart_softc *)self;
127 struct tty *tp;
128 int maj, minor;
129
130 sc->sc_st = oba->oba_st;
131 if (bus_space_map(oba->oba_st, oba->oba_addr, 256, 0,
132 &sc->sc_ioh)) {
133 printf("%s: unable to map device\n", sc->sc_dev.dv_xname);
134 return;
135 }
136
137 /* Establish the interrupt. */
138 sc->sc_ih = adm5120_intr_establish(oba->oba_irq, INTR_FIQ, uart_intr, sc);
139 if (sc->sc_ih == NULL) {
140 printf("%s: unable to establish interrupt\n",
141 sc->sc_dev.dv_xname);
142 return;
143 }
144 REG_WRITE(UART_CR_REG,UART_CR_PORT_EN|UART_CR_RX_INT_EN|UART_CR_RX_TIMEOUT_INT_EN);
145
146 maj = cdevsw_lookup_major(&uart_cdevsw);
147 minor = sc->sc_dev.dv_unit;
148
149 tp = ttymalloc();
150 tp->t_oproc = uart_start;
151 tp->t_param = uart_param;
152 sc->sc_tty = tp;
153 tp->t_dev = makedev(maj, minor);
154 tty_attach(tp);
155 if (minor == 0 && uart_consattached) {
156 /* attach as console*/
157 cn_tab->cn_dev = tp->t_dev;
158 printf(" console");
159 }
160 printf("\n");
161 }
162
163 int
164 uart_cnattach(void)
165 {
166 cn_tab = &uartcons;
167 uart_consattached = 1;
168 return (0);
169 }
170
171 void
172 uart_cnputc(dev_t dev, int c)
173 {
174 char chr;
175 chr = c;
176 while ((*((volatile unsigned long *)0xb2600018)) & 0x20) ;
177 (*((volatile unsigned long *)0xb2600000)) = c;
178 }
179
180 int
181 uart_cngetc(dev_t dev)
182 {
183 while ((*((volatile unsigned long *)0xb2600018)) & 0x10) ;
184 return (*((volatile unsigned long *)0xb2600000)) & 0xff;
185 }
186
187 void
188 uart_cnpollc(dev_t dev, int on)
189 {
190
191 }
192
193
194 /*
195 * TTY device
196 */
197
198 int
199 uart_open(dev_t dev, int flag, int mode, struct lwp *l)
200 {
201 struct uart_softc *sc = device_lookup(&uart_cd, minor(dev));
202 struct tty *tp = sc->sc_tty;
203 int s, error = 0;
204
205 s = spltty();
206
207 tp->t_dev = dev;
208 if ((tp->t_state & TS_ISOPEN) == 0) {
209 tp->t_state |= TS_CARR_ON;
210 ttychars(tp);
211 tp->t_iflag = TTYDEF_IFLAG;
212 tp->t_oflag = TTYDEF_OFLAG;
213 tp->t_cflag = TTYDEF_CFLAG | CLOCAL;
214 tp->t_lflag = TTYDEF_LFLAG;
215 tp->t_ispeed = tp->t_ospeed = 115200;
216 ttsetwater(tp);
217 } else if (tp->t_state & TS_XCLUDE &&
218 kauth_authorize_generic(l->l_proc->p_cred, KAUTH_GENERIC_ISSUSER, &l->l_proc->p_acflag) != 0) {
219 splx(s);
220 return (EBUSY);
221 }
222
223 splx(s);
224
225 error = (*tp->t_linesw->l_open)(dev, tp);
226
227 return (error);
228 }
229
230 int
231 uart_close(dev_t dev, int flag, int mode, struct lwp *l)
232 {
233 struct uart_softc *sc = device_lookup(&uart_cd, minor(dev));
234 struct tty *tp = sc->sc_tty;
235
236 (*tp->t_linesw->l_close)(tp, flag);
237 ttyclose(tp);
238 return (0);
239 }
240
241
242 int
243 uart_read(dev_t dev, struct uio *uio, int flag)
244 {
245 struct uart_softc *sc = device_lookup(&uart_cd, minor(dev));
246 struct tty *tp = sc->sc_tty;
247
248 return ((*tp->t_linesw->l_read)(tp, uio, flag));
249 }
250
251 int
252 uart_write(dev_t dev, struct uio *uio, int flag)
253 {
254 struct uart_softc *sc = device_lookup(&uart_cd, minor(dev));
255 struct tty *tp = sc->sc_tty;
256
257 return ((*tp->t_linesw->l_write)(tp, uio, flag));
258 }
259
260 int
261 uart_poll(dev_t dev, int events, struct lwp *l)
262 {
263 struct uart_softc *sc = device_lookup(&uart_cd, minor(dev));
264 struct tty *tp = sc->sc_tty;
265
266 return ((*tp->t_linesw->l_poll)(tp, events, l));
267 }
268
269 int
270 uart_ioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
271 {
272 struct uart_softc *sc = device_lookup(&uart_cd, minor(dev));
273 struct tty *tp = sc->sc_tty;
274 int error;
275
276 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l);
277 if (error != EPASSTHROUGH)
278 return (error);
279 return (ttioctl(tp, cmd, data, flag, l));
280 }
281
282 int
283 uart_param(struct tty *tp, struct termios *t)
284 {
285
286 return (0);
287 }
288
289 struct tty*
290 uart_tty(dev)
291 dev_t dev;
292 {
293 struct uart_softc *sc = device_lookup(&uart_cd, minor(dev));
294
295 return sc->sc_tty;
296 }
297
298
299 void
300 uart_start(struct tty *tp)
301 {
302 int s,i,cnt;
303
304 s = spltty();
305 if (tp->t_state & (TS_TTSTOP | TS_BUSY))
306 goto out;
307 if (tp->t_outq.c_cc <= tp->t_lowat) {
308 if (tp->t_state & TS_ASLEEP) {
309 tp->t_state &= ~TS_ASLEEP;
310 wakeup((caddr_t)&tp->t_outq);
311 }
312 selwakeup(&tp->t_wsel);
313 }
314 tp->t_state |= TS_BUSY;
315 while (tp->t_outq.c_cc != 0) {
316 cnt = ndqb(&tp->t_outq, 0);
317 for (i=0; i<cnt; i++)
318 uart_cnputc(0,tp->t_outq.c_cf[i]);
319 ndflush(&tp->t_outq, cnt);
320 }
321 tp->t_state &= ~TS_BUSY;
322 out:
323 splx(s);
324 }
325
326 void
327 uart_stop(struct tty *tp, int flag)
328 {
329 int s;
330
331 s = spltty();
332 if (tp->t_state & TS_BUSY)
333 if ((tp->t_state & TS_TTSTOP) == 0)
334 tp->t_state |= TS_FLUSH;
335 splx(s);
336 }
337
338 int
339 uart_intr(void *v)
340 {
341 struct uart_softc *sc = v;
342 struct tty *tp = sc->sc_tty;
343 int c, l_r;
344
345 if (REG_READ(UART_RSR_REG) & UART_RSR_BE) {
346 REG_WRITE(UART_ECR_REG, UART_ECR_RSR);
347 console_debugger();
348 }
349
350 while ((REG_READ(UART_FR_REG) & UART_FR_RX_FIFO_EMPTY) == 0) {
351 c = REG_READ(UART_DR_REG) & 0xff;
352 if (tp->t_state & TS_ISOPEN)
353 l_r = (*tp->t_linesw->l_rint)(c, tp);
354 }
355 return 0;
356 }
357