tslcd.c revision 1.4
1 /* $NetBSD: tslcd.c,v 1.4 2005/02/04 06:02:36 joff 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 #include <sys/cdefs.h> 39 __KERNEL_RCSID(0, "$NetBSD: tslcd.c,v 1.4 2005/02/04 06:02:36 joff Exp $"); 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/proc.h> 44 #include <sys/poll.h> 45 #include <sys/conf.h> 46 #include <sys/uio.h> 47 #include <sys/types.h> 48 #include <sys/kernel.h> 49 #include <sys/device.h> 50 #include <sys/callout.h> 51 #include <sys/select.h> 52 #include <sys/conf.h> 53 54 #include <machine/bus.h> 55 #include <machine/autoconf.h> 56 57 #include <dev/wscons/wsdisplayvar.h> 58 #include <dev/wscons/wsconsio.h> 59 #include <dev/wscons/wscons_callbacks.h> 60 61 #include <arm/ep93xx/ep93xxreg.h> 62 #include <dev/ic/hd44780reg.h> 63 #include <dev/ic/hd44780var.h> 64 #include <evbarm/tsarm/tspldvar.h> 65 #include <evbarm/tsarm/tsarmreg.h> 66 67 struct tslcd_softc { 68 struct device sc_dev; 69 struct hd44780_chip sc_hlcd; 70 bus_space_tag_t sc_iot; 71 bus_space_handle_t sc_gpioh; 72 }; 73 74 static int tslcd_match(struct device *, struct cfdata *, void *); 75 static void tslcd_attach(struct device *, struct device *, void *); 76 77 static void tslcd_writereg(struct hd44780_chip *, u_int32_t, u_int8_t); 78 static u_int8_t tslcd_readreg(struct hd44780_chip *, u_int32_t); 79 80 dev_type_open(tslcdopen); 81 dev_type_close(tslcdclose); 82 dev_type_read(tslcdread); 83 dev_type_write(tslcdwrite); 84 dev_type_ioctl(tslcdioctl); 85 dev_type_poll(tslcdpoll); 86 87 const struct cdevsw tslcd_cdevsw = { 88 tslcdopen, tslcdclose, tslcdread, tslcdwrite, tslcdioctl, 89 nostop, notty, tslcdpoll, nommap, 90 }; 91 92 extern const struct wsdisplay_emulops hlcd_emulops; 93 extern const struct wsdisplay_accessops hlcd_accessops; 94 extern struct cfdriver tslcd_cd; 95 96 CFATTACH_DECL(tslcd, sizeof(struct tslcd_softc), 97 tslcd_match, tslcd_attach, NULL, NULL); 98 99 static const struct wsscreen_descr tslcd_stdscreen = { 100 "std_tslcd", 24, 2, 101 &hlcd_emulops, 102 5, 7, 103 0, 104 }; 105 106 static const struct wsscreen_descr *_tslcd_scrlist[] = { 107 &tslcd_stdscreen, 108 }; 109 110 static const struct wsscreen_list tslcd_screenlist = { 111 sizeof(_tslcd_scrlist) / sizeof(struct wsscreen_descr *), 112 _tslcd_scrlist, 113 }; 114 115 static int 116 tslcd_match(parent, match, aux) 117 struct device *parent; 118 struct cfdata *match; 119 void *aux; 120 { 121 return 1; 122 } 123 124 #define GPIO_GET(x) bus_space_read_1(sc->sc_iot, sc->sc_gpioh, \ 125 (EP93XX_GPIO_ ## x)) 126 127 #define GPIO_SET(x, y) bus_space_write_1(sc->sc_iot, sc->sc_gpioh, \ 128 (EP93XX_GPIO_ ## x), (y)) 129 130 #define GPIO_SETBITS(x, y) bus_space_write_1(sc->sc_iot, sc->sc_gpioh, \ 131 (EP93XX_GPIO_ ## x), GPIO_GET(x) | (y)) 132 133 #define GPIO_CLEARBITS(x, y) bus_space_write_1(sc->sc_iot, sc->sc_gpioh, \ 134 (EP93XX_GPIO_ ## x), GPIO_GET(x) & (~(y))) 135 136 static void 137 tslcd_attach(parent, self, aux) 138 struct device *parent; 139 struct device *self; 140 void *aux; 141 { 142 struct tslcd_softc *sc = (void *)self; 143 struct tspld_attach_args *taa = aux; 144 struct wsemuldisplaydev_attach_args waa; 145 146 sc->sc_iot = taa->ta_iot; 147 if (bus_space_map(sc->sc_iot, EP93XX_APB_HWBASE + EP93XX_APB_GPIO, 148 EP93XX_APB_GPIO_SIZE, 0, &sc->sc_gpioh)) 149 panic("tslcd_attach: couldn't map GPIO registers"); 150 151 sc->sc_hlcd.sc_dev_ok = 1; 152 sc->sc_hlcd.sc_cols = 24; 153 sc->sc_hlcd.sc_vcols = 40; 154 sc->sc_hlcd.sc_flags = HD_8BIT | HD_MULTILINE; 155 sc->sc_hlcd.sc_dev = self; 156 157 sc->sc_hlcd.sc_writereg = tslcd_writereg; 158 sc->sc_hlcd.sc_readreg = tslcd_readreg; 159 160 GPIO_SET(PADDR, 0); /* Port A to inputs */ 161 GPIO_SETBITS(PHDDR, 0x38); /* Bits 3:5 of Port H to outputs */ 162 GPIO_CLEARBITS(PHDR, 0x18); /* De-assert EN, De-assert RS */ 163 164 printf("\n"); 165 166 hd44780_attach_subr(&sc->sc_hlcd); 167 168 waa.console = 0; 169 waa.scrdata = &tslcd_screenlist; 170 waa.accessops = &hlcd_accessops; 171 waa.accesscookie = &sc->sc_hlcd.sc_screen; 172 config_found(self, &waa, wsemuldisplaydevprint); 173 } 174 175 static void 176 tslcd_writereg(hd, rs, cmd) 177 struct hd44780_chip *hd; 178 u_int32_t rs; 179 u_int8_t cmd; 180 { 181 struct tslcd_softc *sc = (struct tslcd_softc *)hd->sc_dev; 182 u_int8_t ctrl; 183 184 if (hd->sc_dev_ok == 0) 185 return; 186 187 /* Step 1: Apply RS & WR, Send data */ 188 ctrl = GPIO_GET(PHDR); 189 GPIO_SET(PADDR, 0xff); /* set port A to outputs */ 190 GPIO_SET(PADR, cmd); 191 if (rs) { 192 ctrl |= 0x10; /* assert RS */ 193 ctrl &= ~0x20; /* assert WR */ 194 } else { 195 ctrl &= ~0x30; /* de-assert WR, de-assert RS */ 196 } 197 GPIO_SET(PHDR, ctrl); 198 199 /* Step 2: setup time delay */ 200 delay(1); 201 202 /* Step 3: assert EN */ 203 ctrl |= 0x8; 204 GPIO_SET(PHDR, ctrl); 205 206 /* Step 4: pulse time delay */ 207 delay(1); 208 209 /* Step 5: de-assert EN */ 210 ctrl &= ~0x8; 211 GPIO_SET(PHDR, ctrl); 212 213 /* Step 6: hold time delay */ 214 delay(1); 215 216 /* Step 7: de-assert WR */ 217 ctrl |= 0x2; 218 GPIO_SET(PHDR, ctrl); 219 220 /* Step 8: minimum delay till next bus-cycle */ 221 delay(1000); 222 } 223 224 static u_int8_t 225 tslcd_readreg(hd, rs) 226 struct hd44780_chip *hd; 227 u_int32_t rs; 228 { 229 struct tslcd_softc *sc = (struct tslcd_softc *)hd->sc_dev; 230 u_int8_t ret, ctrl; 231 232 if (hd->sc_dev_ok == 0) 233 return 0; 234 235 /* Step 1: Apply RS & WR, Send data */ 236 ctrl = GPIO_GET(PHDR); 237 GPIO_SET(PADDR, 0x0); /* set port A to inputs */ 238 if (rs) { 239 ctrl |= 0x30; /* de-assert WR, assert RS */ 240 } else { 241 ctrl |= 0x20; /* de-assert WR */ 242 ctrl &= ~0x10; /* de-assert RS */ 243 } 244 GPIO_SET(PHDR, ctrl); 245 246 /* Step 2: setup time delay */ 247 delay(1); 248 249 /* Step 3: assert EN */ 250 ctrl |= 0x8; 251 GPIO_SET(PHDR, ctrl); 252 253 /* Step 4: pulse time delay */ 254 delay(1); 255 256 /* Step 5: de-assert EN */ 257 ret = GPIO_GET(PADR) & 0xff; 258 ctrl &= ~0x8; 259 GPIO_SET(PHDR, ctrl); 260 261 /* Step 6: hold time delay + min bus cycle interval*/ 262 delay(1000); 263 return ret; 264 } 265 266 int 267 tslcdopen(dev, flag, mode, p) 268 dev_t dev; 269 int flag, mode; 270 struct proc *p; 271 { 272 struct tslcd_softc *sc = device_lookup(&tslcd_cd, minor(dev)); 273 274 if (sc->sc_hlcd.sc_dev_ok == 0) 275 return hd44780_init(&sc->sc_hlcd); 276 else 277 return 0; 278 } 279 280 int 281 tslcdclose(dev, flag, mode, p) 282 dev_t dev; 283 int flag, mode; 284 struct proc *p; 285 { 286 return 0; 287 } 288 289 int 290 tslcdread(dev, uio, flag) 291 dev_t dev; 292 struct uio *uio; 293 int flag; 294 { 295 return EIO; 296 } 297 298 int 299 tslcdwrite(dev, uio, flag) 300 dev_t dev; 301 struct uio *uio; 302 int flag; 303 { 304 int error; 305 struct hd44780_io io; 306 struct tslcd_softc *sc = device_lookup(&tslcd_cd, minor(dev)); 307 308 if (sc->sc_hlcd.sc_dev_ok == 0) 309 return EIO; 310 311 io.dat = 0; 312 io.len = uio->uio_resid; 313 if (io.len > HD_MAX_CHARS) 314 io.len = HD_MAX_CHARS; 315 316 if ((error = uiomove((void*)io.buf, io.len, uio)) != 0) 317 return error; 318 319 hd44780_ddram_redraw(&sc->sc_hlcd, &io); 320 return 0; 321 } 322 323 int 324 tslcdioctl(dev, cmd, data, flag, p) 325 dev_t dev; 326 u_long cmd; 327 caddr_t data; 328 int flag; 329 struct proc *p; 330 { 331 struct tslcd_softc *sc = device_lookup(&tslcd_cd, minor(dev)); 332 return hd44780_ioctl_subr(&sc->sc_hlcd, cmd, data); 333 } 334 335 int 336 tslcdpoll(dev, events, p) 337 dev_t dev; 338 int events; 339 struct proc *p; 340 { 341 return 0; 342 } 343
Indexes created Wed Oct 01 19:09:53 GMT 2025