1*1a918832Sdholland /* $NetBSD: uart.c,v 1.12 2014/07/25 08:10:34 dholland Exp $ */
2320845ddSdyoung
3320845ddSdyoung /*-
4320845ddSdyoung * Copyright (c) 2007 Ruslan Ermilov and Vsevolod Lobko.
5320845ddSdyoung * All rights reserved.
6320845ddSdyoung *
7320845ddSdyoung * Redistribution and use in source and binary forms, with or
8320845ddSdyoung * without modification, are permitted provided that the following
9320845ddSdyoung * conditions are met:
10320845ddSdyoung * 1. Redistributions of source code must retain the above copyright
11320845ddSdyoung * notice, this list of conditions and the following disclaimer.
12320845ddSdyoung * 2. Redistributions in binary form must reproduce the above
13320845ddSdyoung * copyright notice, this list of conditions and the following
14320845ddSdyoung * disclaimer in the documentation and/or other materials provided
15320845ddSdyoung * with the distribution.
16320845ddSdyoung * 3. The names of the authors may not be used to endorse or promote
17320845ddSdyoung * products derived from this software without specific prior
18320845ddSdyoung * written permission.
19320845ddSdyoung *
20320845ddSdyoung * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY
21320845ddSdyoung * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
22320845ddSdyoung * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
23320845ddSdyoung * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS
24320845ddSdyoung * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
25320845ddSdyoung * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
26320845ddSdyoung * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
27320845ddSdyoung * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28320845ddSdyoung * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
29320845ddSdyoung * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
30320845ddSdyoung * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
31320845ddSdyoung * OF SUCH DAMAGE.
32320845ddSdyoung */
33320845ddSdyoung
34320845ddSdyoung #include <sys/cdefs.h>
35*1a918832Sdholland __KERNEL_RCSID(0, "$NetBSD: uart.c,v 1.12 2014/07/25 08:10:34 dholland Exp $");
36320845ddSdyoung
37320845ddSdyoung #include <sys/param.h>
387bec7338Sdyoung #include <sys/bus.h>
39a71ca4f4Smatt #include <sys/conf.h>
40a71ca4f4Smatt #include <sys/device.h>
41a71ca4f4Smatt #include <sys/ioctl.h>
42a71ca4f4Smatt #include <sys/intr.h>
43a71ca4f4Smatt #include <sys/kauth.h>
44a71ca4f4Smatt #include <sys/kernel.h>
45a71ca4f4Smatt #include <sys/proc.h>
46a71ca4f4Smatt #include <sys/tty.h>
47a71ca4f4Smatt
48a71ca4f4Smatt #include <dev/cons.h>
49320845ddSdyoung
50320845ddSdyoung #include <mips/adm5120/include/adm5120var.h>
51320845ddSdyoung #include <mips/adm5120/include/adm5120_obiovar.h>
52320845ddSdyoung #include <mips/adm5120/dev/uart.h>
53320845ddSdyoung
54320845ddSdyoung #define REG_READ(o) bus_space_read_4(sc->sc_st, sc->sc_ioh, (o))
55320845ddSdyoung #define REG_WRITE(o,v) bus_space_write_4(sc->sc_st, sc->sc_ioh, (o),(v))
56320845ddSdyoung
57320845ddSdyoung cons_decl(uart_);
58320845ddSdyoung
59320845ddSdyoung dev_type_open(uart_open);
60320845ddSdyoung dev_type_open(uart_close);
61320845ddSdyoung dev_type_read(uart_read);
62320845ddSdyoung dev_type_write(uart_write);
63320845ddSdyoung dev_type_ioctl(uart_ioctl);
64320845ddSdyoung dev_type_tty(uart_tty);
65320845ddSdyoung dev_type_poll(uart_poll);
66320845ddSdyoung dev_type_stop(uart_stop);
67320845ddSdyoung
68320845ddSdyoung const struct cdevsw uart_cdevsw = {
6976258fa0Sdholland .d_open = uart_open,
7076258fa0Sdholland .d_close = uart_close,
7176258fa0Sdholland .d_read = uart_read,
7276258fa0Sdholland .d_write = uart_write,
7376258fa0Sdholland .d_ioctl = uart_ioctl,
7476258fa0Sdholland .d_stop = uart_stop,
7576258fa0Sdholland .d_tty = uart_tty,
7676258fa0Sdholland .d_poll = uart_poll,
7776258fa0Sdholland .d_mmap = nommap,
7876258fa0Sdholland .d_kqfilter = ttykqfilter,
79*1a918832Sdholland .d_discard = nodiscard,
8076258fa0Sdholland .d_flag = D_TTY
81320845ddSdyoung };
82320845ddSdyoung
83320845ddSdyoung struct consdev uartcons = {
84a71ca4f4Smatt .cn_getc = uart_cngetc,
85a71ca4f4Smatt .cn_putc = uart_cnputc,
86a71ca4f4Smatt .cn_pollc = uart_cnpollc,
87a71ca4f4Smatt .cn_dev = NODEV,
88a71ca4f4Smatt .cn_pri = CN_NORMAL
89320845ddSdyoung };
90320845ddSdyoung
91320845ddSdyoung struct uart_softc {
92a71ca4f4Smatt device_t sc_dev;
93320845ddSdyoung struct tty * sc_tty;
94320845ddSdyoung
95320845ddSdyoung bus_space_tag_t sc_st;
96320845ddSdyoung bus_space_handle_t sc_ioh;
97320845ddSdyoung void * sc_ih;
98320845ddSdyoung };
99320845ddSdyoung
100320845ddSdyoung extern struct cfdriver uart_cd;
101320845ddSdyoung static int uart_consattached;
102320845ddSdyoung
103a71ca4f4Smatt static int uart_probe (device_t, cfdata_t, void *);
104a71ca4f4Smatt static void uart_attach (device_t, device_t, void *);
105320845ddSdyoung
106320845ddSdyoung void uart_start(struct tty *);
107320845ddSdyoung int uart_param(struct tty *, struct termios *);
108320845ddSdyoung int uart_intr(void *);
109320845ddSdyoung
110a71ca4f4Smatt CFATTACH_DECL_NEW(uart, sizeof(struct uart_softc),
111320845ddSdyoung uart_probe, uart_attach, NULL, NULL);
112320845ddSdyoung
113320845ddSdyoung static int
uart_probe(device_t parent,cfdata_t cf,void * aux)114a71ca4f4Smatt uart_probe(device_t parent, cfdata_t cf, void *aux)
115320845ddSdyoung {
116a71ca4f4Smatt struct obio_attach_args * const oba = aux;
117320845ddSdyoung
118a71ca4f4Smatt if (strcmp(oba->oba_name, cf->cf_name) == 0)
119320845ddSdyoung return (1);
120320845ddSdyoung
121320845ddSdyoung return (0);
122320845ddSdyoung }
123320845ddSdyoung
124320845ddSdyoung static void
uart_attach(device_t parent,device_t self,void * aux)125a71ca4f4Smatt uart_attach(device_t parent, device_t self, void *aux)
126320845ddSdyoung {
127a71ca4f4Smatt struct obio_attach_args * const oba = aux;
128a71ca4f4Smatt struct uart_softc * const sc = device_private(self);
129320845ddSdyoung struct tty *tp;
130320845ddSdyoung int maj, minor;
131320845ddSdyoung
132a71ca4f4Smatt sc->sc_dev = self;
133320845ddSdyoung sc->sc_st = oba->oba_st;
134a71ca4f4Smatt if (bus_space_map(oba->oba_st, oba->oba_addr, 256, 0, &sc->sc_ioh)) {
135a71ca4f4Smatt aprint_error("unable to map device\n");
136320845ddSdyoung return;
137320845ddSdyoung }
138320845ddSdyoung
139320845ddSdyoung /* Establish the interrupt. */
140320845ddSdyoung sc->sc_ih = adm5120_intr_establish(oba->oba_irq, INTR_FIQ, uart_intr, sc);
141320845ddSdyoung if (sc->sc_ih == NULL) {
142a71ca4f4Smatt aprint_error("unable to establish interrupt\n");
143320845ddSdyoung return;
144320845ddSdyoung }
145320845ddSdyoung REG_WRITE(UART_CR_REG,UART_CR_PORT_EN|UART_CR_RX_INT_EN|UART_CR_RX_TIMEOUT_INT_EN);
146320845ddSdyoung
147320845ddSdyoung maj = cdevsw_lookup_major(&uart_cdevsw);
148a71ca4f4Smatt minor = device_unit(sc->sc_dev);
149320845ddSdyoung
15080f6fc52Srmind tp = tty_alloc();
151320845ddSdyoung tp->t_oproc = uart_start;
152320845ddSdyoung tp->t_param = uart_param;
153320845ddSdyoung sc->sc_tty = tp;
154320845ddSdyoung tp->t_dev = makedev(maj, minor);
155320845ddSdyoung tty_attach(tp);
156320845ddSdyoung if (minor == 0 && uart_consattached) {
157320845ddSdyoung /* attach as console*/
158320845ddSdyoung cn_tab->cn_dev = tp->t_dev;
159a71ca4f4Smatt aprint_normal(" console");
160320845ddSdyoung }
161a71ca4f4Smatt aprint_normal("\n");
162320845ddSdyoung }
163320845ddSdyoung
164320845ddSdyoung int
uart_cnattach(void)165320845ddSdyoung uart_cnattach(void)
166320845ddSdyoung {
167320845ddSdyoung cn_tab = &uartcons;
168320845ddSdyoung uart_consattached = 1;
169320845ddSdyoung return (0);
170320845ddSdyoung }
171320845ddSdyoung
172320845ddSdyoung void
uart_cnputc(dev_t dev,int c)173320845ddSdyoung uart_cnputc(dev_t dev, int c)
174320845ddSdyoung {
175a71ca4f4Smatt while ((*((volatile unsigned long *)0xb2600018)) & 0x20)
176a71ca4f4Smatt continue;
177320845ddSdyoung (*((volatile unsigned long *)0xb2600000)) = c;
178320845ddSdyoung }
179320845ddSdyoung
180320845ddSdyoung int
uart_cngetc(dev_t dev)181320845ddSdyoung uart_cngetc(dev_t dev)
182320845ddSdyoung {
183a71ca4f4Smatt while ((*((volatile unsigned long *)0xb2600018)) & 0x10)
184a71ca4f4Smatt continue;
185320845ddSdyoung return (*((volatile unsigned long *)0xb2600000)) & 0xff;
186320845ddSdyoung }
187320845ddSdyoung
188320845ddSdyoung void
uart_cnpollc(dev_t dev,int on)189320845ddSdyoung uart_cnpollc(dev_t dev, int on)
190320845ddSdyoung {
191320845ddSdyoung
192320845ddSdyoung }
193320845ddSdyoung
194320845ddSdyoung
195320845ddSdyoung /*
196320845ddSdyoung * TTY device
197320845ddSdyoung */
198320845ddSdyoung
199320845ddSdyoung int
uart_open(dev_t dev,int flag,int mode,struct lwp * l)200320845ddSdyoung uart_open(dev_t dev, int flag, int mode, struct lwp *l)
201320845ddSdyoung {
2023d8fe45fScegger struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev));
203320845ddSdyoung struct tty *tp = sc->sc_tty;
204320845ddSdyoung int s, error = 0;
205320845ddSdyoung
206320845ddSdyoung s = spltty();
207320845ddSdyoung
208320845ddSdyoung tp->t_dev = dev;
209320845ddSdyoung if ((tp->t_state & TS_ISOPEN) == 0) {
210320845ddSdyoung tp->t_state |= TS_CARR_ON;
211320845ddSdyoung ttychars(tp);
212320845ddSdyoung tp->t_iflag = TTYDEF_IFLAG;
213320845ddSdyoung tp->t_oflag = TTYDEF_OFLAG;
214320845ddSdyoung tp->t_cflag = TTYDEF_CFLAG | CLOCAL;
215320845ddSdyoung tp->t_lflag = TTYDEF_LFLAG;
216320845ddSdyoung tp->t_ispeed = tp->t_ospeed = 115200;
217320845ddSdyoung ttsetwater(tp);
2187e7e1a0aSelad } else if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN,
2197e7e1a0aSelad tp) != 0) {
220320845ddSdyoung splx(s);
221320845ddSdyoung return (EBUSY);
222320845ddSdyoung }
223320845ddSdyoung
224320845ddSdyoung splx(s);
225320845ddSdyoung
226320845ddSdyoung error = (*tp->t_linesw->l_open)(dev, tp);
227320845ddSdyoung
228320845ddSdyoung return (error);
229320845ddSdyoung }
230320845ddSdyoung
231320845ddSdyoung int
uart_close(dev_t dev,int flag,int mode,struct lwp * l)232320845ddSdyoung uart_close(dev_t dev, int flag, int mode, struct lwp *l)
233320845ddSdyoung {
2343d8fe45fScegger struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev));
235320845ddSdyoung struct tty *tp = sc->sc_tty;
236320845ddSdyoung
237320845ddSdyoung (*tp->t_linesw->l_close)(tp, flag);
238320845ddSdyoung ttyclose(tp);
239320845ddSdyoung return (0);
240320845ddSdyoung }
241320845ddSdyoung
242320845ddSdyoung
243320845ddSdyoung int
uart_read(dev_t dev,struct uio * uio,int flag)244320845ddSdyoung uart_read(dev_t dev, struct uio *uio, int flag)
245320845ddSdyoung {
2463d8fe45fScegger struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev));
247320845ddSdyoung struct tty *tp = sc->sc_tty;
248320845ddSdyoung
249320845ddSdyoung return ((*tp->t_linesw->l_read)(tp, uio, flag));
250320845ddSdyoung }
251320845ddSdyoung
252320845ddSdyoung int
uart_write(dev_t dev,struct uio * uio,int flag)253320845ddSdyoung uart_write(dev_t dev, struct uio *uio, int flag)
254320845ddSdyoung {
2553d8fe45fScegger struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev));
256320845ddSdyoung struct tty *tp = sc->sc_tty;
257320845ddSdyoung
258320845ddSdyoung return ((*tp->t_linesw->l_write)(tp, uio, flag));
259320845ddSdyoung }
260320845ddSdyoung
261320845ddSdyoung int
uart_poll(dev_t dev,int events,struct lwp * l)262320845ddSdyoung uart_poll(dev_t dev, int events, struct lwp *l)
263320845ddSdyoung {
2643d8fe45fScegger struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev));
265320845ddSdyoung struct tty *tp = sc->sc_tty;
266320845ddSdyoung
267320845ddSdyoung return ((*tp->t_linesw->l_poll)(tp, events, l));
268320845ddSdyoung }
269320845ddSdyoung
270320845ddSdyoung int
uart_ioctl(dev_t dev,u_long cmd,void * data,int flag,struct lwp * l)271320845ddSdyoung uart_ioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
272320845ddSdyoung {
2733d8fe45fScegger struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev));
274320845ddSdyoung struct tty *tp = sc->sc_tty;
275320845ddSdyoung int error;
276320845ddSdyoung
277320845ddSdyoung error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l);
278320845ddSdyoung if (error != EPASSTHROUGH)
279320845ddSdyoung return (error);
280320845ddSdyoung return (ttioctl(tp, cmd, data, flag, l));
281320845ddSdyoung }
282320845ddSdyoung
283320845ddSdyoung int
uart_param(struct tty * tp,struct termios * t)284320845ddSdyoung uart_param(struct tty *tp, struct termios *t)
285320845ddSdyoung {
286320845ddSdyoung
287320845ddSdyoung return (0);
288320845ddSdyoung }
289320845ddSdyoung
290320845ddSdyoung struct tty*
uart_tty(dev_t dev)2913d8fe45fScegger uart_tty(dev_t dev)
292320845ddSdyoung {
2933d8fe45fScegger struct uart_softc *sc = device_lookup_private(&uart_cd, minor(dev));
294320845ddSdyoung
295320845ddSdyoung return sc->sc_tty;
296320845ddSdyoung }
297320845ddSdyoung
298320845ddSdyoung
299320845ddSdyoung void
uart_start(struct tty * tp)300320845ddSdyoung uart_start(struct tty *tp)
301320845ddSdyoung {
302320845ddSdyoung int s,i,cnt;
303320845ddSdyoung
304320845ddSdyoung s = spltty();
305320845ddSdyoung if (tp->t_state & (TS_TTSTOP | TS_BUSY))
306320845ddSdyoung goto out;
307dc26833bSad ttypull(tp);
308320845ddSdyoung tp->t_state |= TS_BUSY;
309320845ddSdyoung while (tp->t_outq.c_cc != 0) {
310320845ddSdyoung cnt = ndqb(&tp->t_outq, 0);
311320845ddSdyoung for (i=0; i<cnt; i++)
312320845ddSdyoung uart_cnputc(0,tp->t_outq.c_cf[i]);
313320845ddSdyoung ndflush(&tp->t_outq, cnt);
314320845ddSdyoung }
315320845ddSdyoung tp->t_state &= ~TS_BUSY;
316320845ddSdyoung out:
317320845ddSdyoung splx(s);
318320845ddSdyoung }
319320845ddSdyoung
320320845ddSdyoung void
uart_stop(struct tty * tp,int flag)321320845ddSdyoung uart_stop(struct tty *tp, int flag)
322320845ddSdyoung {
323320845ddSdyoung int s;
324320845ddSdyoung
325320845ddSdyoung s = spltty();
326320845ddSdyoung if (tp->t_state & TS_BUSY)
327320845ddSdyoung if ((tp->t_state & TS_TTSTOP) == 0)
328320845ddSdyoung tp->t_state |= TS_FLUSH;
329320845ddSdyoung splx(s);
330320845ddSdyoung }
331320845ddSdyoung
332320845ddSdyoung int
uart_intr(void * v)333320845ddSdyoung uart_intr(void *v)
334320845ddSdyoung {
335320845ddSdyoung struct uart_softc *sc = v;
336320845ddSdyoung struct tty *tp = sc->sc_tty;
337cd8d06c6Sskrll int c;
338320845ddSdyoung
339320845ddSdyoung if (REG_READ(UART_RSR_REG) & UART_RSR_BE) {
340320845ddSdyoung REG_WRITE(UART_ECR_REG, UART_ECR_RSR);
341320845ddSdyoung console_debugger();
342320845ddSdyoung }
343320845ddSdyoung
344320845ddSdyoung while ((REG_READ(UART_FR_REG) & UART_FR_RX_FIFO_EMPTY) == 0) {
345320845ddSdyoung c = REG_READ(UART_DR_REG) & 0xff;
346320845ddSdyoung if (tp->t_state & TS_ISOPEN)
347cd8d06c6Sskrll (*tp->t_linesw->l_rint)(c, tp);
348320845ddSdyoung }
349320845ddSdyoung return 0;
350320845ddSdyoung }
351