imxuart.c revision 1.2 1 /* $Id: imxuart.c,v 1.2 2008/04/27 18:58:44 matt Exp $ */
2 #include <sys/types.h>
3 #include <sys/systm.h>
4 #include <sys/device.h>
5 #include <sys/conf.h>
6
7 #include <arm/armreg.h>
8
9 #include <sys/tty.h>
10 #include <sys/termios.h>
11 #include <dev/cons.h>
12
13 #include <machine/bus.h>
14 #include <arm/imx/imx31var.h>
15 #include <arm/imx/imxuartreg.h>
16 #include <arm/imx/imxuartvar.h>
17 #include <evbarm/imx31/imx31lk_reg.h>
18
19 #define IMXUART_UNIT_MASK 0x7ffff
20 #define IMXUART_DIALOUT_MASK 0x80000
21
22 #define IMXUART_UNIT(dev) (minor(dev) & IMXUART_UNIT_MASK)
23 #define IMXUART_DIALOUT(dev) (minor(dev) & IMXUART_DIALOUT_MASK)
24
25
26
27 #define __TRACE imxuart_puts(&imxuart_softc, __FUNCTION__ )
28
29 extern struct bus_space imx31_bs_tag;
30
31 imxuart_softc_t imxuart_softc = { { 0, }, };
32
33 uint32_t imxuart_snapshot_data[32];
34 const char *imxuart_test_string =
35 "0123456789012345678901234567890123456789\r\n";
36
37
38 cons_decl(imxuart);
39 static struct consdev imxuartcntab = cons_init(imxuart);
40
41 #ifdef NOTYET
42 dev_type_open(imxuartopen);
43 dev_type_close(imxuartclose);
44 dev_type_read(imxuartread);
45 dev_type_write(imxuartwrite);
46 dev_type_ioctl(imxuartioctl);
47 dev_type_stop(imxuartstop);
48 dev_type_tty(imxuarttty);
49 dev_type_poll(imxuartpoll);
50 const struct cdevsw imxuart_cdevsw = {
51 imxuartopen, imxuartclose, imxuartread, imxuartwrite,
52 imxuartioctl, imxuartstop, imxuarttty, imxuartpoll,
53 nommap, ttykqfilter, D_TTY
54 };
55 #else
56 const struct cdevsw imxuart_cdevsw = {
57 nullopen, nullclose, nullread, nullwrite,
58 nullioctl, nullstop, notty, nullpoll,
59 nommap, nullkqfilter, D_TTY
60 };
61 #endif
62
63
64 int imxuart_cnattach(bus_space_tag_t, bus_addr_t, int, int, int, tcflag_t);
65 int imxuart_puts(imxuart_softc_t *, const char *);
66 int imxuart_putchar(imxuart_softc_t *, int);
67 int imxuart_getchar(imxuart_softc_t *);
68
69 static int imxuart_urxd_brk(void);
70 static void imxuart_urxd_err(imxuart_softc_t *, uint32_t);
71
72 static int imxuart_match(struct device *, struct cfdata *, void *);
73 static void imxuart_attach(struct device *, struct device *, void *);
74
75 static void imxuart_start(struct tty *);
76 static int imxuart_param(struct tty *, struct termios *);
77 static void imxuart_shutdownhook(void *arg);
78
79 CFATTACH_DECL(imxuart, sizeof(struct imxuart_softc),
80 imxuart_match, imxuart_attach, NULL, NULL);
81
82
83 /*
84 * disable the specified IMX UART interrupt in softc
85 * return -1 on error
86 * else return previous enabled state
87 */
88 static __inline int
89 imxuart_intrspec_dis(imxuart_softc_t *sc, imxuart_intrix_t ix)
90 {
91 const imxuart_intrspec_t *spec = &imxuart_intrspec_tab[ix];
92 uint32_t v;
93 uint32_t b;
94 const uint32_t syncbit = 1 << 31;
95 uint n;
96
97 if (ix >= IMXUART_INTRSPEC_TAB_SZ)
98 return -1;
99
100 v = (1 << ix);
101 if ((sc->sc_intrspec_enb & v) == 0)
102 return 0;
103 sc->sc_intrspec_enb &= ~v;
104
105 n = spec->enb_reg;
106 b = spec->enb_bit;
107 v = sc->sc_ucr[n];
108 v &= ~b;
109 v |= syncbit;
110 sc->sc_ucr[n] = v;
111
112 n = spec->flg_reg;
113 b = spec->flg_bit;
114 v = sc->sc_usr[n];
115 v &= ~b;
116 v |= syncbit;
117 sc->sc_usr[n] = v;
118
119 return 1;
120 }
121
122 /*
123 * enable the specified IMX UART interrupt in softc
124 * return -1 on error
125 * else return previous enabled state
126 */
127 static __inline int
128 imxuart_intrspec_enb(imxuart_softc_t *sc, imxuart_intrix_t ix)
129 {
130 const imxuart_intrspec_t *spec = &imxuart_intrspec_tab[ix];
131 uint32_t v;
132 uint n;
133 const uint32_t syncbit = 1 << 31;
134
135 if (ix >= IMXUART_INTRSPEC_TAB_SZ)
136 return -1;
137
138 v = (1 << ix);
139 if ((sc->sc_intrspec_enb & v) != 0)
140 return 1;
141 sc->sc_intrspec_enb |= v;
142
143
144 n = spec->enb_reg;
145 v = spec->enb_bit;
146 v |= syncbit;
147 sc->sc_ucr[n] |= v;
148
149 n = spec->flg_reg;
150 v = spec->flg_bit;
151 v |= syncbit;
152 sc->sc_usr[n] |= v;
153
154 return 0;
155 }
156
157 /*
158 * sync softc interrupt spec to UART Control regs
159 */
160 static __inline void
161 imxuart_intrspec_sync(imxuart_softc_t *sc)
162 {
163 int i;
164 uint32_t r;
165 uint32_t v;
166 const uint32_t syncbit = 1 << 31;
167 const uint32_t mask[4] = {
168 IMXUART_INTRS_UCR1,
169 IMXUART_INTRS_UCR2,
170 IMXUART_INTRS_UCR3,
171 IMXUART_INTRS_UCR4
172 };
173
174 for (i=0; i < 4; i++) {
175 v = sc->sc_ucr[i];
176 if (v & syncbit) {
177 v &= ~syncbit;
178 sc->sc_ucr[i] = v;
179 r = bus_space_read_4(sc->sc_bt, sc->sc_bh, IMX_UCRn(i));
180 r &= ~mask[i];
181 r |= v;
182 bus_space_write_4(sc->sc_bt, sc->sc_bh, IMX_UCRn(i), r);
183 }
184 }
185 }
186
187
188 int
189 imxuart_init(imxuart_softc_t *sc, uint bh)
190 {
191 if (sc == 0)
192 sc = &imxuart_softc;
193 sc->sc_init_cnt++;
194 cn_tab = &imxuartcntab;
195 sc->sc_bt = &imx31_bs_tag;
196 sc->sc_bh = bh;
197
198 memset(&sc->sc_errors, 0, sizeof(sc->sc_errors));
199
200 return 0;
201 }
202
203 int
204 imxuart_puts(imxuart_softc_t *sc, const char *s)
205 {
206 char c;
207 int err = -2;
208
209 for(;;) {
210 c = *s++;
211 if (c == '\0')
212 break;
213 err = imxuart_putchar(sc, c);
214 }
215 return err;
216 }
217
218 int
219 imxuart_putchar(imxuart_softc_t *sc, int c)
220 {
221 uint32_t r;
222
223 for (;;) {
224 r = bus_space_read_4(sc->sc_bt, sc->sc_bh, IMX_UTS);
225 if ((r & IMX_UTS_TXFUL) == 0)
226 break;
227 }
228
229 r = (uint32_t)c & IMX_UTXD_TX_DATA;
230 bus_space_write_4(sc->sc_bt, sc->sc_bh, IMX_UTXD, r);
231
232 return 0;
233 }
234
235 int
236 imxuart_getchar(imxuart_softc_t *sc)
237 {
238 uint32_t r;
239 int c;
240
241 for(;;) {
242 r = bus_space_read_4(sc->sc_bt, sc->sc_bh, IMX_URXD);
243 if (r & IMX_URXD_ERR) {
244 imxuart_urxd_err(sc, r);
245 continue;
246 }
247 if (r & IMX_URXD_CHARDY) {
248 c = (int)(r & IMX_URXD_RX_DATA);
249 break;
250 }
251 }
252
253 return c;
254 }
255
256 static int
257 imxuart_urxd_brk(void)
258 {
259 #ifdef DDB
260 if (cn_tab == &imxuartcntab) {
261 Debugger();
262 return 0;
263 }
264 #endif
265 return 1;
266 }
267
268 static void
269 imxuart_urxd_err(imxuart_softc_t *sc, uint32_t r)
270 {
271 if (r & IMX_URXD_BRK)
272 if (imxuart_urxd_brk() == 0)
273 return;
274
275 sc->sc_errors.err++;
276 if (r & IMX_URXD_BRK)
277 sc->sc_errors.brk++;
278 if (r & IMX_URXD_PRERR)
279 sc->sc_errors.prerr++;
280 if (r & IMX_URXD_FRMERR)
281 sc->sc_errors.frmerr++;
282 if (r & IMX_URXD_OVRRUN)
283 sc->sc_errors.ovrrun++;
284 }
285
286 static int
287 imxuart_snapshot(imxuart_softc_t *sc, uint32_t *p)
288 {
289 int i;
290 const uint r[] = { IMX_URXD, IMX_UTXD, IMX_UCR1, IMX_UCR2,
291 IMX_UCR3, IMX_UCR4, IMX_UFCR, IMX_USR1,
292 IMX_USR2, IMX_UESC, IMX_UTIM, IMX_UBIR,
293 IMX_UBMR, IMX_UBRC, IMX_ONEMS, IMX_UTS };
294
295 for (i=0; i < ((sizeof(r)/sizeof(r[0]))); i++) {
296 *p++ = sc->sc_bh + r[i];
297 *p++ = bus_space_read_4(sc->sc_bt, sc->sc_bh, r[i]);
298 }
299 return 0;
300 }
301
302 int
303 imxuart_test(void)
304 {
305 imxuart_softc_t *sc = &imxuart_softc;
306 int n;
307 int err;
308
309 err = imxuart_init(sc, 1);
310 if (err != 0)
311 return err;
312
313 if (0) {
314 extern u_int cpufunc_id(void);
315 err = cpufunc_id();
316 return err;
317 }
318
319 #if 0
320 err = imxuart_snapshot(sc, imxuart_snapshot_data);
321 if (err != 0)
322 return err;
323 #endif
324
325
326 err = imxuart_putchar(sc, 'x');
327 if (err != 0)
328 return err;
329
330 for (n=100; n--; ) {
331 err = imxuart_puts(sc, imxuart_test_string);
332 if (err != 0)
333 break;
334 }
335
336 err = imxuart_snapshot(sc, imxuart_snapshot_data);
337 if (err != 0)
338 return err;
339
340 return err;
341 }
342
343 static int
344 imxuart_match(struct device *parent, struct cfdata *cf, void *aux)
345 {
346 struct aips_attach_args * const aipsa = aux;
347
348 switch (aipsa->aipsa_addr) {
349 case IMX_UART1_BASE:
350 case IMX_UART2_BASE:
351 case IMX_UART3_BASE:
352 case IMX_UART4_BASE:
353 case IMX_UART5_BASE:
354 return 1;
355 default:
356 return 0;
357 }
358 }
359
360 static void
361 imxuart_attach(struct device *parent, struct device *self, void *aux)
362 {
363 imxuart_softc_t *sc = (void *)self;
364 struct aips_attach_args * const aipsa = aux;
365 struct tty *tp;
366
367 sc->sc_bt = aipsa->aipsa_memt;
368 sc->sc_addr = aipsa->aipsa_addr;
369 sc->sc_size = aipsa->aipsa_size;
370 sc->sc_intr = aipsa->aipsa_intr;
371
372 sc->sc_tty = tp = ttymalloc();
373 tp->t_oproc = imxuart_start;
374 tp->t_param = imxuart_param;
375 tty_attach(tp);
376
377 shutdownhook_establish(imxuart_shutdownhook, sc);
378
379 printf("\n");
380 }
381
382 void
383 imxuartcnprobe(struct consdev *cp)
384 {
385 int major;
386
387 __TRACE;
388 major = cdevsw_lookup_major(&imxuart_cdevsw);
389 cp->cn_dev = makedev(major, 0); /* XXX unit 0 */
390 cp->cn_pri = CN_REMOTE;
391 }
392
393 static void
394 imxuart_start(struct tty *tp)
395 {
396 __TRACE;
397 }
398
399 static int
400 imxuart_param(struct tty *tp, struct termios *termios)
401 {
402 __TRACE;
403 return 0;
404 }
405
406 static void
407 imxuart_shutdownhook(void *arg)
408 {
409 __TRACE;
410 }
411
412 void
413 imxuartcninit(struct consdev *cp)
414 {
415 __TRACE;
416 }
417
418 int
419 imxuartcngetc(dev_t dev)
420 {
421 struct imxuart_softc *sc;
422 uint unit;
423 int c;
424
425 unit = IMXUART_UNIT(dev);
426 if (unit != 0)
427 return 0;
428 sc = &imxuart_softc;
429 c = imxuart_getchar(sc);
430 return c;
431 }
432
433 void
434 imxuartcnputc(dev_t dev, int c)
435 {
436 (void)imxuart_putchar(&imxuart_softc, c);
437 }
438
439 void
440 imxuartcnpollc(dev_t dev, int mode)
441 {
442 /* always polled for now */
443 }
444 int
445 imxuart_cnattach(bus_space_tag_t iot, bus_addr_t iobase,
446 int rate, int frequency, int type, tcflag_t cflag)
447 {
448 cn_tab = &imxuartcntab;
449 return 0;
450 }
451
452