1 /* $NetBSD: tslcd.c,v 1.20 2021/08/07 16:18:50 thorpej Exp $ */
2
3 /*-
4 * Copyright (c) 1998 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jesse Off.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31 #include <sys/cdefs.h>
32 __KERNEL_RCSID(0, "$NetBSD: tslcd.c,v 1.20 2021/08/07 16:18:50 thorpej Exp $");
33
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/proc.h>
37 #include <sys/poll.h>
38 #include <sys/conf.h>
39 #include <sys/uio.h>
40 #include <sys/types.h>
41 #include <sys/kernel.h>
42 #include <sys/device.h>
43 #include <sys/callout.h>
44 #include <sys/select.h>
45
46 #include <sys/bus.h>
47 #include <machine/autoconf.h>
48
49 #include <dev/wscons/wsdisplayvar.h>
50 #include <dev/wscons/wsconsio.h>
51 #include <dev/wscons/wscons_callbacks.h>
52
53 #include <arm/ep93xx/ep93xxreg.h>
54 #include <arm/ep93xx/epgpioreg.h>
55 #include <dev/ic/hd44780reg.h>
56 #include <dev/ic/hd44780var.h>
57 #include <evbarm/tsarm/tspldvar.h>
58 #include <evbarm/tsarm/tsarmreg.h>
59
60 struct tslcd_softc {
61 struct hd44780_chip sc_hlcd;
62 bus_space_tag_t sc_iot;
63 bus_space_handle_t sc_gpioh;
64 };
65
66 static int tslcd_match(device_t, cfdata_t, void *);
67 static void tslcd_attach(device_t, device_t, void *);
68
69 static void tslcd_writereg(struct hd44780_chip *, uint32_t, uint32_t, uint8_t);
70 static uint8_t tslcd_readreg(struct hd44780_chip *, uint32_t, uint32_t);
71
72 dev_type_open(tslcdopen);
73 dev_type_close(tslcdclose);
74 dev_type_read(tslcdread);
75 dev_type_write(tslcdwrite);
76 dev_type_ioctl(tslcdioctl);
77 dev_type_poll(tslcdpoll);
78
79 const struct cdevsw tslcd_cdevsw = {
80 .d_open = tslcdopen,
81 .d_close = tslcdclose,
82 .d_read = tslcdread,
83 .d_write = tslcdwrite,
84 .d_ioctl = tslcdioctl,
85 .d_stop = nostop,
86 .d_tty = notty,
87 .d_poll = tslcdpoll,
88 .d_mmap = nommap,
89 .d_kqfilter = nokqfilter,
90 .d_discard = nodiscard,
91 .d_flag = 0
92 };
93
94 extern const struct wsdisplay_emulops hlcd_emulops;
95 extern const struct wsdisplay_accessops hlcd_accessops;
96 extern struct cfdriver tslcd_cd;
97
98 CFATTACH_DECL_NEW(tslcd, sizeof(struct tslcd_softc),
99 tslcd_match, tslcd_attach, NULL, NULL);
100
101 static const struct wsscreen_descr tslcd_stdscreen = {
102 "std_tslcd", 24, 2,
103 &hlcd_emulops,
104 5, 7,
105 0,
106 };
107
108 static const struct wsscreen_descr *_tslcd_scrlist[] = {
109 &tslcd_stdscreen,
110 };
111
112 static const struct wsscreen_list tslcd_screenlist = {
113 sizeof(_tslcd_scrlist) / sizeof(struct wsscreen_descr *),
114 _tslcd_scrlist,
115 };
116
117 static int
tslcd_match(device_t parent,cfdata_t match,void * aux)118 tslcd_match(device_t parent, cfdata_t match, void *aux)
119 {
120 return 1;
121 }
122
123 #define GPIO_GET(x) bus_space_read_1(sc->sc_iot, sc->sc_gpioh, \
124 (EP93XX_GPIO_ ## x))
125
126 #define GPIO_SET(x, y) bus_space_write_1(sc->sc_iot, sc->sc_gpioh, \
127 (EP93XX_GPIO_ ## x), (y))
128
129 #define GPIO_SETBITS(x, y) bus_space_write_1(sc->sc_iot, sc->sc_gpioh, \
130 (EP93XX_GPIO_ ## x), GPIO_GET(x) | (y))
131
132 #define GPIO_CLEARBITS(x, y) bus_space_write_1(sc->sc_iot, sc->sc_gpioh, \
133 (EP93XX_GPIO_ ## x), GPIO_GET(x) & (~(y)))
134
135 static void
tslcd_attach(device_t parent,device_t self,void * aux)136 tslcd_attach(device_t parent, device_t self, void *aux)
137 {
138 struct tslcd_softc *sc = device_private(self);
139 struct tspld_attach_args *taa = aux;
140 struct wsemuldisplaydev_attach_args waa;
141
142 sc->sc_iot = taa->ta_iot;
143 if (bus_space_map(sc->sc_iot, EP93XX_APB_HWBASE + EP93XX_APB_GPIO,
144 EP93XX_APB_GPIO_SIZE, 0, &sc->sc_gpioh))
145 panic("tslcd_attach: couldn't map GPIO registers");
146
147 sc->sc_hlcd.sc_dev_ok = 1;
148 sc->sc_hlcd.sc_cols = 24;
149 sc->sc_hlcd.sc_vcols = 40;
150 sc->sc_hlcd.sc_flags = HD_8BIT | HD_MULTILINE;
151 sc->sc_hlcd.sc_dev = self;
152
153 sc->sc_hlcd.sc_writereg = tslcd_writereg;
154 sc->sc_hlcd.sc_readreg = tslcd_readreg;
155
156 GPIO_SET(PADDR, 0); /* Port A to inputs */
157 GPIO_SETBITS(PHDDR, 0x38); /* Bits 3:5 of Port H to outputs */
158 GPIO_CLEARBITS(PHDR, 0x18); /* De-assert EN, De-assert RS */
159
160 printf("\n");
161
162 hd44780_attach_subr(&sc->sc_hlcd);
163
164 waa.console = 0;
165 waa.scrdata = &tslcd_screenlist;
166 waa.accessops = &hlcd_accessops;
167 waa.accesscookie = &sc->sc_hlcd.sc_screen;
168 config_found(self, &waa, wsemuldisplaydevprint, CFARGS_NONE);
169 }
170
171 static void
tslcd_writereg(struct hd44780_chip * hd,uint32_t en,uint32_t rs,uint8_t cmd)172 tslcd_writereg(struct hd44780_chip *hd, uint32_t en, uint32_t rs, uint8_t cmd)
173 {
174 struct tslcd_softc *sc = device_private(hd->sc_dev);
175 uint8_t ctrl;
176
177 if (hd->sc_dev_ok == 0)
178 return;
179
180 /* Step 1: Apply RS & WR, Send data */
181 ctrl = GPIO_GET(PHDR);
182 GPIO_SET(PADDR, 0xff); /* set port A to outputs */
183 GPIO_SET(PADR, cmd);
184 if (rs) {
185 ctrl |= 0x10; /* assert RS */
186 ctrl &= ~0x20; /* assert WR */
187 } else {
188 ctrl &= ~0x30; /* de-assert WR, de-assert RS */
189 }
190 GPIO_SET(PHDR, ctrl);
191
192 /* Step 2: setup time delay */
193 delay(1);
194
195 /* Step 3: assert EN */
196 ctrl |= 0x8;
197 GPIO_SET(PHDR, ctrl);
198
199 /* Step 4: pulse time delay */
200 delay(1);
201
202 /* Step 5: de-assert EN */
203 ctrl &= ~0x8;
204 GPIO_SET(PHDR, ctrl);
205
206 /* Step 6: hold time delay */
207 delay(1);
208
209 /* Step 7: de-assert WR */
210 ctrl |= 0x2;
211 GPIO_SET(PHDR, ctrl);
212
213 /* Step 8: minimum delay till next bus-cycle */
214 delay(1000);
215 }
216
217 static uint8_t
tslcd_readreg(struct hd44780_chip * hd,uint32_t en,uint32_t rs)218 tslcd_readreg(struct hd44780_chip *hd, uint32_t en, uint32_t rs)
219 {
220 struct tslcd_softc *sc = device_private(hd->sc_dev);
221 uint8_t ret, ctrl;
222
223 if (hd->sc_dev_ok == 0)
224 return 0;
225
226 /* Step 1: Apply RS & WR, Send data */
227 ctrl = GPIO_GET(PHDR);
228 GPIO_SET(PADDR, 0x0); /* set port A to inputs */
229 if (rs) {
230 ctrl |= 0x30; /* de-assert WR, assert RS */
231 } else {
232 ctrl |= 0x20; /* de-assert WR */
233 ctrl &= ~0x10; /* de-assert RS */
234 }
235 GPIO_SET(PHDR, ctrl);
236
237 /* Step 2: setup time delay */
238 delay(1);
239
240 /* Step 3: assert EN */
241 ctrl |= 0x8;
242 GPIO_SET(PHDR, ctrl);
243
244 /* Step 4: pulse time delay */
245 delay(1);
246
247 /* Step 5: de-assert EN */
248 ret = GPIO_GET(PADR) & 0xff;
249 ctrl &= ~0x8;
250 GPIO_SET(PHDR, ctrl);
251
252 /* Step 6: hold time delay + min bus cycle interval*/
253 delay(1000);
254 return ret;
255 }
256
257 int
tslcdopen(dev_t dev,int flag,int mode,struct lwp * l)258 tslcdopen(dev_t dev, int flag, int mode, struct lwp *l)
259 {
260 struct tslcd_softc *sc = device_lookup_private(&tslcd_cd, minor(dev));
261
262 if (sc->sc_hlcd.sc_dev_ok == 0)
263 return hd44780_init(&sc->sc_hlcd);
264 else
265 return 0;
266 }
267
268 int
tslcdclose(dev_t dev,int flag,int mode,struct lwp * l)269 tslcdclose(dev_t dev, int flag, int mode, struct lwp *l)
270 {
271 return 0;
272 }
273
274 int
tslcdread(dev_t dev,struct uio * uio,int flag)275 tslcdread(dev_t dev, struct uio *uio, int flag)
276 {
277 return EIO;
278 }
279
280 int
tslcdwrite(dev_t dev,struct uio * uio,int flag)281 tslcdwrite(dev_t dev, struct uio *uio, int flag)
282 {
283 int error;
284 struct hd44780_io io;
285 struct tslcd_softc *sc = device_lookup_private(&tslcd_cd, minor(dev));
286
287 if (sc->sc_hlcd.sc_dev_ok == 0)
288 return EIO;
289
290 io.dat = 0;
291 io.len = uio->uio_resid;
292 if (io.len > HD_MAX_CHARS)
293 io.len = HD_MAX_CHARS;
294
295 if ((error = uiomove((void*)io.buf, io.len, uio)) != 0)
296 return error;
297
298 hd44780_ddram_redraw(&sc->sc_hlcd, sc->sc_hlcd.sc_curchip, &io);
299 return 0;
300 }
301
302 int
tslcdioctl(dev_t dev,u_long cmd,void * data,int flag,struct lwp * l)303 tslcdioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
304 {
305 struct tslcd_softc *sc = device_lookup_private(&tslcd_cd, minor(dev));
306 return hd44780_ioctl_subr(&sc->sc_hlcd, cmd, data);
307 }
308
309 int
tslcdpoll(dev_t dev,int events,struct lwp * l)310 tslcdpoll(dev_t dev, int events, struct lwp *l)
311 {
312 return 0;
313 }
314