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[netbsd-mini2440.git] / sys / arch / evbarm / mpcsa / mpcsa_usart.c
blob966c703f162105d4eac4b281e7b990ed5092a874
1 /* $Id: mpcsa_usart.c,v 1.2 2008/07/03 01:15:39 matt Exp $ */
2 /* $NetBSD$ */
3
4 /*
5 * Copyright (c) 2007 Embedtronics Oy. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * 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 copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __KERNEL_RCSID(0, "$NetBSD$");
31
32 #include <sys/types.h>
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/kernel.h>
36 #include <sys/device.h>
37 #include <sys/proc.h>
38 #include <arm/at91/at91reg.h>
39 #include <arm/at91/at91var.h>
40 #include <arm/at91/at91usartvar.h>
41 #include <arm/at91/at91piovar.h>
42 #include <arm/at91/at91rm9200reg.h>
43 #include <evbarm/mpcsa/mpcsa_io.h>
44 #include <evbarm/mpcsa/mpcsa_leds_var.h>
45 #include <sys/unistd.h>
46
47 #ifdef MPCSA_USART_DEBUG
48 int mpcsa_usart_debug = MPCSA_USART_DEBUG;
49 #define DPRINTFN(n,x) if (mpcsa_usart_debug>(n)) printf x;
50 #else
51 #define DPRINTFN(n,x)
52 #endif
53
54 struct at91pio_softc;
55
56 struct mpcsa_usart_softc {
57 struct at91usart_softc sc_dev;
58 struct at91pio_softc *sc_pioa, *sc_piob, *sc_piod;
59 void *sc_cts_ih;
60 int sc_tx_busy, sc_rx_busy;
61 };
62
63 static int mpcsa_usart_match(struct device *, struct cfdata *, void *);
64 static void mpcsa_usart_attach(struct device *, struct device *, void *);
65
66 CFATTACH_DECL(mpcsa_usart, sizeof(struct mpcsa_usart_softc),
67 mpcsa_usart_match, mpcsa_usart_attach, NULL, NULL);
68
69 static int mpcsa_usart_enable(struct at91usart_softc *sc);
70 static int mpcsa_usart_disable(struct at91usart_softc *sc);
71 static void mpcsa_usart_hwflow(struct at91usart_softc *sc, int cflags);
72 static void mpcsa_usart_start_tx(struct at91usart_softc *sc);
73 static void mpcsa_usart_stop_tx(struct at91usart_softc *sc);
74 static void mpcsa_usart_rx_started(struct at91usart_softc *sc);
75 static void mpcsa_usart_rx_stopped(struct at91usart_softc *sc);
76 static void mpcsa_usart_rx_rts_ctl(struct at91usart_softc *sc, int enabled);
77
78 static int mpcsa_gsm_cts_intr(void *);
79
80 static __inline int
81 led_num(struct mpcsa_usart_softc *mpsc)
82 {
83 return (mpsc->sc_dev.sc_pid == PID_US3 ? LED_GSM : LED_SER1 + mpsc->sc_dev.sc_pid - PID_US0);
84 }
85
86 static __inline void
87 comm_led(struct mpcsa_usart_softc *mpsc, int count)
88 {
89 mpcsa_comm_led(led_num(mpsc), count);
90 }
91
92 static __inline void
93 conn_led(struct mpcsa_usart_softc *mpsc, int count)
94 {
95 mpcsa_conn_led(led_num(mpsc), count);
96 }
97
98 static int
99 mpcsa_usart_match(struct device *parent, struct cfdata *match, void *aux)
100 {
101 if (strcmp(match->cf_name, "at91usart") == 0 && strcmp(match->cf_atname, "mpcsa_usart") == 0)
102 return 2;
103 return 0;
104 }
105
106
107 static void
108 mpcsa_usart_attach(struct device *parent, struct device *self, void *aux)
109 {
110 struct mpcsa_usart_softc *sc = (struct mpcsa_usart_softc *)self;
111 struct at91bus_attach_args *sa = aux;
112
113 // initialize softc
114 if ((sc->sc_pioa = at91pio_sc(AT91_PIOA)) == NULL) {
115 printf("no PIOA!\n");
116 return;
117 }
118 if ((sc->sc_piob = at91pio_sc(AT91_PIOB)) == NULL) {
119 printf("no PIOB!\n");
120 return;
121 }
122 if ((sc->sc_piod = at91pio_sc(AT91_PIOD)) == NULL) {
123 printf("no PIOD!\n");
124 return;
125 }
126
127 // calculate unit number...
128 switch (sa->sa_pid) {
129 case PID_US0:
130 case PID_US1:
131 case PID_US2:
132 case PID_US3:
133 sc->sc_dev.enable = mpcsa_usart_enable;
134 sc->sc_dev.disable = mpcsa_usart_disable;
135 sc->sc_dev.hwflow = mpcsa_usart_hwflow;
136 sc->sc_dev.start_tx = mpcsa_usart_start_tx;
137 sc->sc_dev.stop_tx = mpcsa_usart_stop_tx;
138 sc->sc_dev.rx_started = mpcsa_usart_rx_started;
139 sc->sc_dev.rx_stopped = mpcsa_usart_rx_stopped;
140 sc->sc_dev.rx_rts_ctl = mpcsa_usart_rx_rts_ctl;
141 break;
142 }
143
144 /* configure pins */
145 switch (sa->sa_pid) {
146 case PID_US0:
147 at91pio_set(sc->sc_piob, PB_RTS1);
148 at91pio_set(sc->sc_piod, PD_DTR1);
149 at91pio_in(sc->sc_piob, PB_CTS1);
150 at91pio_out(sc->sc_piob, PB_RTS1);
151 at91pio_in(sc->sc_piod, PD_DSR1);
152 at91pio_out(sc->sc_piod, PD_DTR1);
153 at91pio_per(sc->sc_piob, PB_CTS1, -1);
154 at91pio_per(sc->sc_piob, PB_RTS1, -1);
155 at91pio_per(sc->sc_piod, PD_DSR1, -1);
156 at91pio_per(sc->sc_piod, PD_DTR1, -1);
157 break;
158 case PID_US1:
159 at91pio_set(sc->sc_piob, PB_RTS2);
160 at91pio_set(sc->sc_piod, PD_DTR2);
161 at91pio_in(sc->sc_piob, PB_CTS2);
162 at91pio_out(sc->sc_piob, PB_RTS2);
163 at91pio_in(sc->sc_piod, PD_DSR2);
164 at91pio_out(sc->sc_piod, PD_DTR2);
165 at91pio_per(sc->sc_piob, PB_CTS2, -1);
166 at91pio_per(sc->sc_piob, PB_RTS2, -1);
167 at91pio_per(sc->sc_piod, PD_DSR2, -1);
168 at91pio_per(sc->sc_piod, PD_DTR2, -1);
169 break;
170 case PID_US2:
171 at91pio_set(sc->sc_piob, PB_RTS3);
172 at91pio_set(sc->sc_piod, PD_DTR3);
173 at91pio_in(sc->sc_piob, PB_CTS3);
174 at91pio_out(sc->sc_piob, PB_RTS3);
175 at91pio_in(sc->sc_piod, PD_DSR3);
176 at91pio_out(sc->sc_piod, PD_DTR3);
177 at91pio_per(sc->sc_piob, PB_CTS3, -1);
178 at91pio_per(sc->sc_piob, PB_RTS3, -1);
179 at91pio_per(sc->sc_piod, PD_DSR3, -1);
180 at91pio_per(sc->sc_piod, PD_DTR3, -1);
181 break;
182 case PID_US3:
183 /* configure pin states... */
184 at91pio_clear(sc->sc_pioa, PA_GSMON);
185 at91pio_set(sc->sc_pioa, PA_GSMOFF);
186 at91pio_set(sc->sc_piob, PB_RTS4);
187 at91pio_set(sc->sc_piod, PD_DTR4);
188
189 /* configure pin directions.. */
190 at91pio_out(sc->sc_pioa, PA_GSMOFF);
191 at91pio_out(sc->sc_pioa, PA_GSMON);
192 at91pio_in(sc->sc_pioa, PA_TXD4);
193 at91pio_in(sc->sc_piob, PB_RTS4);
194 at91pio_in(sc->sc_piob, PB_CTS4);
195 at91pio_in(sc->sc_piod, PD_DTR4);
196 at91pio_in(sc->sc_piod, PD_DSR4);
197 at91pio_in(sc->sc_piod, PD_DCD4);
198
199 /* make sure all related pins are configured as PIO */
200 at91pio_per(sc->sc_pioa, PA_GSMOFF, -1);
201 at91pio_per(sc->sc_pioa, PA_GSMON, -1);
202 at91pio_per(sc->sc_pioa, PA_TXD4, -1);
203 at91pio_per(sc->sc_piob, PB_CTS4, -1);
204 at91pio_per(sc->sc_piob, PB_RTS4, -1);
205 at91pio_per(sc->sc_piod, PD_DSR4, -1);
206 at91pio_per(sc->sc_piod, PD_DTR4, -1);
207 at91pio_per(sc->sc_piod, PD_DCD4, -1);
208 break;
209 }
210
211 // and call common routine
212 at91usart_attach_subr(&sc->sc_dev, sa);
213 }
214
215 static int
216 mpcsa_usart_enable(struct at91usart_softc *dev)
217 {
218 struct mpcsa_usart_softc *sc = (struct mpcsa_usart_softc *)dev;
219 conn_led(sc, 1);
220 switch (sc->sc_dev.sc_pid) {
221 case PID_US3:
222 /* turn gsm on */
223 at91pio_clear(sc->sc_pioa, PA_GSMOFF);
224 ltsleep(sc, 0, "gsmond", 4 * hz, NULL);
225 at91pio_set(sc->sc_pioa, PA_GSMON);
226 ltsleep(sc, 0, "gsmon", 2 * hz, NULL);
227 at91pio_clear(sc->sc_pioa, PA_GSMON);
228 /* then attach pins to devices etc */
229 at91pio_per(sc->sc_pioa, PA_TXD4, 1);
230 at91pio_clear(sc->sc_piob, PB_RTS4);
231 at91pio_clear(sc->sc_piod, PD_DTR4);
232 at91pio_out(sc->sc_piob, PB_RTS4);
233 at91pio_out(sc->sc_piod, PD_DTR4);
234 /* catch CTS interrupt */
235 sc->sc_cts_ih = at91pio_intr_establish(sc->sc_piob, PB_CTS4,
236 IPL_TTY, mpcsa_gsm_cts_intr,
237 sc);
238 break;
239 }
240 return 0;
241 }
242
243 static int
244 mpcsa_usart_disable(struct at91usart_softc *dev)
245 {
246 struct mpcsa_usart_softc *sc = (struct mpcsa_usart_softc *)dev;
247 if (sc->sc_tx_busy || sc->sc_rx_busy) {
248 sc->sc_tx_busy = sc->sc_rx_busy = 0;
249 comm_led(sc, 1);
250 }
251 switch (sc->sc_dev.sc_pid) {
252 case PID_US3:
253 at91pio_intr_disestablish(sc->sc_piob, PB_CTS4, sc->sc_cts_ih);
254
255 at91pio_clear(sc->sc_pioa, PA_GSMON);
256 ltsleep(sc, 0, "gsmoffd", (hz * 350 + 999) / 1000, NULL);
257
258 at91pio_per(sc->sc_pioa, PA_TXD4, -1);
259 at91pio_in(sc->sc_piob, PB_RTS4);
260 at91pio_in(sc->sc_piod, PD_DTR4);
261
262 at91pio_set(sc->sc_pioa, PA_GSMOFF);
263 ltsleep(sc, 0, "gsmoff", hz * 4, NULL);
264 at91pio_clear(sc->sc_pioa, PA_GSMOFF);
265
266 break;
267 }
268 conn_led(sc, 0);
269 return 0;
270 }
271
272 static int mpcsa_gsm_cts_intr(void *cookie)
273 {
274 struct mpcsa_usart_softc *sc = (struct mpcsa_usart_softc *)cookie;
275 if (ISSET(sc->sc_dev.sc_swflags, TIOCFLAG_CRTSCTS)) {
276 /* hardware flow control is enabled */
277 if (!(PIOB_READ(PIO_PDSR) & (1U << PB_CTS4))) {
278 if (bus_space_read_4(sc->sc_dev.sc_iot, sc->sc_dev.sc_ioh,
279 US_PDC + PDC_TCR) && !sc->sc_tx_busy) {
280 sc->sc_tx_busy = 1;
281 if (!sc->sc_rx_busy)
282 comm_led(sc, INFINITE_BLINK);
283 }
284
285 bus_space_write_4(sc->sc_dev.sc_iot, sc->sc_dev.sc_ioh,
286 US_PDC + PDC_PTCR, PDC_PTCR_TXTEN);
287 SET(sc->sc_dev.sc_ier, US_CSR_TXEMPTY | US_CSR_ENDTX);
288 bus_space_write_4(sc->sc_dev.sc_iot, sc->sc_dev.sc_ioh,
289 US_IER, US_CSR_ENDTX);
290 } else {
291 bus_space_write_4(sc->sc_dev.sc_iot, sc->sc_dev.sc_ioh,
292 US_PDC + PDC_PTCR, PDC_PTCR_TXTDIS);
293 if (sc->sc_tx_busy) {
294 sc->sc_tx_busy = 0;
295 if (!sc->sc_rx_busy)
296 comm_led(sc, 1);
297 }
298 }
299 }
300 return 0;
301 }
302
303 static void
304 mpcsa_usart_hwflow(struct at91usart_softc *dev, int flags)
305 {
306 }
307
308 static void
309 mpcsa_usart_start_tx(struct at91usart_softc *sc)
310 {
311 if (!ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS)
312 || bus_space_read_4(sc->sc_iot, sc->sc_ioh, US_PDC + PDC_PTSR) & PDC_PTSR_TXTEN) {
313 bus_space_write_4(sc->sc_iot, sc->sc_ioh,
314 US_PDC + PDC_PTCR, PDC_PTCR_TXTEN);
315 struct mpcsa_usart_softc *mpsc = (void*)sc;
316 if (!mpsc->sc_tx_busy) {
317 mpsc->sc_tx_busy = 1;
318 if (!mpsc->sc_rx_busy)
319 comm_led(mpsc, INFINITE_BLINK);
320 }
321 return;
322 }
323 }
324
325 static void
326 mpcsa_usart_stop_tx(struct at91usart_softc *sc)
327 {
328 struct mpcsa_usart_softc *mpsc = (void*)sc;
329 mpsc->sc_tx_busy = 0;
330 if (!mpsc->sc_rx_busy)
331 comm_led(mpsc, 1);
332 if (!ISSET(sc->sc_swflags, TIOCFLAG_CRTSCTS)) {
333 bus_space_write_4(sc->sc_iot, sc->sc_ioh,
334 US_PDC + PDC_PTCR, PDC_PTCR_TXTDIS);
335 }
336 }
337
338 static void
339 mpcsa_usart_rx_started(struct at91usart_softc *sc)
340 {
341 struct mpcsa_usart_softc *mpsc = (void*)sc;
342 if (!mpsc->sc_rx_busy) {
343 mpsc->sc_rx_busy = 1;
344 if (!mpsc->sc_tx_busy)
345 comm_led(mpsc, INFINITE_BLINK);
346 }
347 }
348
349 static void
350 mpcsa_usart_rx_stopped(struct at91usart_softc *sc)
351 {
352 struct mpcsa_usart_softc *mpsc = (void*)sc;
353 mpsc->sc_rx_busy = 0;
354 if (!mpsc->sc_tx_busy)
355 comm_led(mpsc, 1);
356 }
357
358 static void
359 mpcsa_usart_rx_rts_ctl(struct at91usart_softc *sc, int enabled)
360 {
361 struct mpcsa_usart_softc *mpsc = (void*)sc;
362
363 switch (mpsc->sc_dev.sc_pid) {
364 case PID_US0:
365 if (enabled)
366 at91pio_set(mpsc->sc_piob, PB_RTS1);
367 else
368 at91pio_clear(mpsc->sc_piob, PB_RTS1);
369 break;
370
371 case PID_US1:
372 if (enabled)
373 at91pio_set(mpsc->sc_piob, PB_RTS2);
374 else
375 at91pio_clear(mpsc->sc_piob, PB_RTS2);
376 break;
377
378 case PID_US2:
379 if (enabled)
380 at91pio_set(mpsc->sc_piob, PB_RTS3);
381 else
382 at91pio_clear(mpsc->sc_piob, PB_RTS3);
383 break;
384
385 case PID_US3:
386 if (enabled)
387 at91pio_set(mpsc->sc_piob, PB_RTS4);
388 else
389 at91pio_clear(mpsc->sc_piob, PB_RTS4);
390 break;
391
392 }
393
394 }
395
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