1 /* $NetBSD: uart.c,v 1.12 2014/07/25 08:10:34 dholland 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 1.12 2014/07/25 08:10:34 dholland Exp $");
36
37 #include <sys/param.h>
38 #include <sys/bus.h>
39 #include <sys/conf.h>
40 #include <sys/device.h>
41 #include <sys/ioctl.h>
42 #include <sys/intr.h>
43 #include <sys/kauth.h>
44 #include <sys/kernel.h>
45 #include <sys/proc.h>
46 #include <sys/tty.h>
47
48 #include <dev/cons.h>
49
50 #include <mips/adm5120/include/adm5120var.h>
51 #include <mips/adm5120/include/adm5120_obiovar.h>
52 #include <mips/adm5120/dev/uart.h>
53
54 #define REG_READ(o) bus_space_read_4(sc->sc_st, sc->sc_ioh, (o))
55 #define REG_WRITE(o,v) bus_space_write_4(sc->sc_st, sc->sc_ioh, (o),(v))
56
57 cons_decl(uart_);
58
59 dev_type_open(uart_open);
60 dev_type_open(uart_close);
61 dev_type_read(uart_read);
62 dev_type_write(uart_write);
63 dev_type_ioctl(uart_ioctl);
64 dev_type_tty(uart_tty);
65 dev_type_poll(uart_poll);
66 dev_type_stop(uart_stop);
67
68 const struct cdevsw uart_cdevsw = {
69 .d_open = uart_open,
70 .d_close = uart_close,
71 .d_read = uart_read,
72 .d_write = uart_write,
73 .d_ioctl = uart_ioctl,
74 .d_stop = uart_stop,
75 .d_tty = uart_tty,
76 .d_poll = uart_poll,
77 .d_mmap = nommap,
78 .d_kqfilter = ttykqfilter,
79 .d_discard = nodiscard,
80 .d_flag = D_TTY
81 };
82
83 struct consdev uartcons = {
84 .cn_getc = uart_cngetc,
85 .cn_putc = uart_cnputc,
86 .cn_pollc = uart_cnpollc,
87 .cn_dev = NODEV,
88 .cn_pri = CN_NORMAL
89 };
90
91 struct uart_softc {
92 device_t sc_dev;
93 struct tty * sc_tty;
94
95 bus_space_tag_t sc_st;
96 bus_space_handle_t sc_ioh;
97 void * sc_ih;
98 };
99
100 extern struct cfdriver uart_cd;
101 static int uart_consattached;
102
103 static int uart_probe (device_t, cfdata_t, void *);
104 static void uart_attach (device_t, device_t, void *);
105
106 void uart_start(struct tty *);
107 int uart_param(struct tty *, struct termios *);
108 int uart_intr(void *);
109
110 CFATTACH_DECL_NEW(uart, sizeof(struct uart_softc),
111 uart_probe, uart_attach, NULL, NULL);
112
113 static int
uart_probe(device_t parent,cfdata_t cf,void * aux)114 uart_probe(device_t parent, cfdata_t cf, void *aux)
115 {
116 struct obio_attach_args * const oba = aux;
117
118 if (strcmp(oba->oba_name, cf->cf_name) == 0)
119 return (1);
120
121 return (0);
122 }
123
124 static void
uart_attach(device_t parent,device_t self,void * aux)125 uart_attach(device_t parent, device_t self, void *aux)
126 {
127 struct obio_attach_args * const oba = aux;
128 struct uart_softc * const sc = device_private(self);
129 struct tty *tp;
130 int maj, minor;
131
132 sc->sc_dev = self;
133 sc->sc_st = oba->oba_st;
134 if (bus_space_map(oba->oba_st, oba->oba_addr, 256, 0, &sc->sc_ioh)) {
135 aprint_error("unable to map device\n");
136 return;
137 }
138
139 /* Establish the interrupt. */
140 sc->sc_ih = adm5120_intr_establish(oba->oba_irq, INTR_FIQ, uart_intr, sc);
141 if (sc->sc_ih == NULL) {
142 aprint_error("unable to establish interrupt\n");
143 return;
144 }
145 REG_WRITE(UART_CR_REG,UART_CR_PORT_EN|UART_CR_RX_INT_EN|UART_CR_RX_TIMEOUT_INT_EN);
146
147 maj = cdevsw_lookup_major(&uart_cdevsw);
148 minor = device_unit(sc->sc_dev);
149
150 tp = tty_alloc();
151 tp->t_oproc = uart_start;
152 tp->t_param = uart_param;
153 sc->sc_tty = tp;
154 tp->t_dev = makedev(maj, minor);
155 tty_attach(tp);
156 if (minor == 0 && uart_consattached) {
157 /* attach as console*/
158 cn_tab->cn_dev = tp->t_dev;
159 aprint_normal(" console");
160 }
161 aprint_normal("\n");
162 }
163
164 int
uart_cnattach(void)165 uart_cnattach(void)
166 {
167 cn_tab = &uartcons;
168 uart_consattached = 1;
169 return (0);
170 }
171
172 void
uart_cnputc(dev_t dev,int c)173 uart_cnputc(dev_t dev, int c)
174 {
175 while ((*((volatile unsigned long *)0xb2600018)) & 0x20)
176 continue;
177 (*((volatile unsigned long *)0xb2600000)) = c;
178 }
179
180 int
uart_cngetc(dev_t dev)181 uart_cngetc(dev_t dev)
182 {
183 while ((*((volatile unsigned long *)0xb2600018)) & 0x10)
184 continue;
185 return (*((volatile unsigned long *)0xb2600000)) & 0xff;
186 }
187
188 void
uart_cnpollc(dev_t dev,int on)189 uart_cnpollc(dev_t dev, int on)
190 {
191
192 }
193
194
195 /*
196 * TTY device
197 */
198
199 int
uart_open(dev_t dev,int flag,int mode,struct lwp * l)200 uart_open(dev_t dev, int flag, int mode, struct lwp *l)
201 {
202 struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev));
203 struct tty *tp = sc->sc_tty;
204 int s, error = 0;
205
206 s = spltty();
207
208 tp->t_dev = dev;
209 if ((tp->t_state & TS_ISOPEN) == 0) {
210 tp->t_state |= TS_CARR_ON;
211 ttychars(tp);
212 tp->t_iflag = TTYDEF_IFLAG;
213 tp->t_oflag = TTYDEF_OFLAG;
214 tp->t_cflag = TTYDEF_CFLAG | CLOCAL;
215 tp->t_lflag = TTYDEF_LFLAG;
216 tp->t_ispeed = tp->t_ospeed = 115200;
217 ttsetwater(tp);
218 } else if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN,
219 tp) != 0) {
220 splx(s);
221 return (EBUSY);
222 }
223
224 splx(s);
225
226 error = (*tp->t_linesw->l_open)(dev, tp);
227
228 return (error);
229 }
230
231 int
uart_close(dev_t dev,int flag,int mode,struct lwp * l)232 uart_close(dev_t dev, int flag, int mode, struct lwp *l)
233 {
234 struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev));
235 struct tty *tp = sc->sc_tty;
236
237 (*tp->t_linesw->l_close)(tp, flag);
238 ttyclose(tp);
239 return (0);
240 }
241
242
243 int
uart_read(dev_t dev,struct uio * uio,int flag)244 uart_read(dev_t dev, struct uio *uio, int flag)
245 {
246 struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev));
247 struct tty *tp = sc->sc_tty;
248
249 return ((*tp->t_linesw->l_read)(tp, uio, flag));
250 }
251
252 int
uart_write(dev_t dev,struct uio * uio,int flag)253 uart_write(dev_t dev, struct uio *uio, int flag)
254 {
255 struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev));
256 struct tty *tp = sc->sc_tty;
257
258 return ((*tp->t_linesw->l_write)(tp, uio, flag));
259 }
260
261 int
uart_poll(dev_t dev,int events,struct lwp * l)262 uart_poll(dev_t dev, int events, struct lwp *l)
263 {
264 struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev));
265 struct tty *tp = sc->sc_tty;
266
267 return ((*tp->t_linesw->l_poll)(tp, events, l));
268 }
269
270 int
uart_ioctl(dev_t dev,u_long cmd,void * data,int flag,struct lwp * l)271 uart_ioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
272 {
273 struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev));
274 struct tty *tp = sc->sc_tty;
275 int error;
276
277 error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l);
278 if (error != EPASSTHROUGH)
279 return (error);
280 return (ttioctl(tp, cmd, data, flag, l));
281 }
282
283 int
uart_param(struct tty * tp,struct termios * t)284 uart_param(struct tty *tp, struct termios *t)
285 {
286
287 return (0);
288 }
289
290 struct tty*
uart_tty(dev_t dev)291 uart_tty(dev_t dev)
292 {
293 struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev));
294
295 return sc->sc_tty;
296 }
297
298
299 void
uart_start(struct tty * tp)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 ttypull(tp);
308 tp->t_state |= TS_BUSY;
309 while (tp->t_outq.c_cc != 0) {
310 cnt = ndqb(&tp->t_outq, 0);
311 for (i=0; i<cnt; i++)
312 uart_cnputc(0,tp->t_outq.c_cf[i]);
313 ndflush(&tp->t_outq, cnt);
314 }
315 tp->t_state &= ~TS_BUSY;
316 out:
317 splx(s);
318 }
319
320 void
uart_stop(struct tty * tp,int flag)321 uart_stop(struct tty *tp, int flag)
322 {
323 int s;
324
325 s = spltty();
326 if (tp->t_state & TS_BUSY)
327 if ((tp->t_state & TS_TTSTOP) == 0)
328 tp->t_state |= TS_FLUSH;
329 splx(s);
330 }
331
332 int
uart_intr(void * v)333 uart_intr(void *v)
334 {
335 struct uart_softc *sc = v;
336 struct tty *tp = sc->sc_tty;
337 int c;
338
339 if (REG_READ(UART_RSR_REG) & UART_RSR_BE) {
340 REG_WRITE(UART_ECR_REG, UART_ECR_RSR);
341 console_debugger();
342 }
343
344 while ((REG_READ(UART_FR_REG) & UART_FR_RX_FIFO_EMPTY) == 0) {
345 c = REG_READ(UART_DR_REG) & 0xff;
346 if (tp->t_state & TS_ISOPEN)
347 (*tp->t_linesw->l_rint)(c, tp);
348 }
349 return 0;
350 }
351