tslcd.c revision 1.7
1 /* $NetBSD: tslcd.c,v 1.7 2006/08/31 17:53:19 matt 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 1.7 2006/08/31 17:53:19 matt 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 <arm/ep93xx/epgpioreg.h> 63 #include <dev/ic/hd44780reg.h> 64 #include <dev/ic/hd44780var.h> 65 #include <evbarm/tsarm/tspldvar.h> 66 #include <evbarm/tsarm/tsarmreg.h> 67 68 struct tslcd_softc { 69 struct device sc_dev; 70 struct hd44780_chip sc_hlcd; 71 bus_space_tag_t sc_iot; 72 bus_space_handle_t sc_gpioh; 73 }; 74 75 static int tslcd_match(struct device *, struct cfdata *, void *); 76 static void tslcd_attach(struct device *, struct device *, void *); 77 78 static void tslcd_writereg(struct hd44780_chip *, u_int32_t, u_int32_t, u_int8_t); 79 static u_int8_t tslcd_readreg(struct hd44780_chip *, u_int32_t, u_int32_t); 80 81 dev_type_open(tslcdopen); 82 dev_type_close(tslcdclose); 83 dev_type_read(tslcdread); 84 dev_type_write(tslcdwrite); 85 dev_type_ioctl(tslcdioctl); 86 dev_type_poll(tslcdpoll); 87 88 const struct cdevsw tslcd_cdevsw = { 89 tslcdopen, tslcdclose, tslcdread, tslcdwrite, tslcdioctl, 90 nostop, notty, tslcdpoll, nommap, 91 }; 92 93 extern const struct wsdisplay_emulops hlcd_emulops; 94 extern const struct wsdisplay_accessops hlcd_accessops; 95 extern struct cfdriver tslcd_cd; 96 97 CFATTACH_DECL(tslcd, sizeof(struct tslcd_softc), 98 tslcd_match, tslcd_attach, NULL, NULL); 99 100 static const struct wsscreen_descr tslcd_stdscreen = { 101 "std_tslcd", 24, 2, 102 &hlcd_emulops, 103 5, 7, 104 0, 105 }; 106 107 static const struct wsscreen_descr *_tslcd_scrlist[] = { 108 &tslcd_stdscreen, 109 }; 110 111 static const struct wsscreen_list tslcd_screenlist = { 112 sizeof(_tslcd_scrlist) / sizeof(struct wsscreen_descr *), 113 _tslcd_scrlist, 114 }; 115 116 static int 117 tslcd_match(parent, match, aux) 118 struct device *parent; 119 struct cfdata *match; 120 void *aux; 121 { 122 return 1; 123 } 124 125 #define GPIO_GET(x) bus_space_read_1(sc->sc_iot, sc->sc_gpioh, \ 126 (EP93XX_GPIO_ ## x)) 127 128 #define GPIO_SET(x, y) bus_space_write_1(sc->sc_iot, sc->sc_gpioh, \ 129 (EP93XX_GPIO_ ## x), (y)) 130 131 #define GPIO_SETBITS(x, y) bus_space_write_1(sc->sc_iot, sc->sc_gpioh, \ 132 (EP93XX_GPIO_ ## x), GPIO_GET(x) | (y)) 133 134 #define GPIO_CLEARBITS(x, y) bus_space_write_1(sc->sc_iot, sc->sc_gpioh, \ 135 (EP93XX_GPIO_ ## x), GPIO_GET(x) & (~(y))) 136 137 static void 138 tslcd_attach(parent, self, aux) 139 struct device *parent; 140 struct device *self; 141 void *aux; 142 { 143 struct tslcd_softc *sc = (void *)self; 144 struct tspld_attach_args *taa = aux; 145 struct wsemuldisplaydev_attach_args waa; 146 147 sc->sc_iot = taa->ta_iot; 148 if (bus_space_map(sc->sc_iot, EP93XX_APB_HWBASE + EP93XX_APB_GPIO, 149 EP93XX_APB_GPIO_SIZE, 0, &sc->sc_gpioh)) 150 panic("tslcd_attach: couldn't map GPIO registers"); 151 152 sc->sc_hlcd.sc_dev_ok = 1; 153 sc->sc_hlcd.sc_cols = 24; 154 sc->sc_hlcd.sc_vcols = 40; 155 sc->sc_hlcd.sc_flags = HD_8BIT | HD_MULTILINE; 156 sc->sc_hlcd.sc_dev = self; 157 158 sc->sc_hlcd.sc_writereg = tslcd_writereg; 159 sc->sc_hlcd.sc_readreg = tslcd_readreg; 160 161 GPIO_SET(PADDR, 0); /* Port A to inputs */ 162 GPIO_SETBITS(PHDDR, 0x38); /* Bits 3:5 of Port H to outputs */ 163 GPIO_CLEARBITS(PHDR, 0x18); /* De-assert EN, De-assert RS */ 164 165 printf("\n"); 166 167 hd44780_attach_subr(&sc->sc_hlcd); 168 169 waa.console = 0; 170 waa.scrdata = &tslcd_screenlist; 171 waa.accessops = &hlcd_accessops; 172 waa.accesscookie = &sc->sc_hlcd.sc_screen; 173 config_found(self, &waa, wsemuldisplaydevprint); 174 } 175 176 static void 177 tslcd_writereg(hd, en, rs, cmd) 178 struct hd44780_chip *hd; 179 u_int32_t en, rs; 180 u_int8_t cmd; 181 { 182 struct tslcd_softc *sc = (struct tslcd_softc *)hd->sc_dev; 183 u_int8_t ctrl; 184 185 if (hd->sc_dev_ok == 0) 186 return; 187 188 /* Step 1: Apply RS & WR, Send data */ 189 ctrl = GPIO_GET(PHDR); 190 GPIO_SET(PADDR, 0xff); /* set port A to outputs */ 191 GPIO_SET(PADR, cmd); 192 if (rs) { 193 ctrl |= 0x10; /* assert RS */ 194 ctrl &= ~0x20; /* assert WR */ 195 } else { 196 ctrl &= ~0x30; /* de-assert WR, de-assert RS */ 197 } 198 GPIO_SET(PHDR, ctrl); 199 200 /* Step 2: setup time delay */ 201 delay(1); 202 203 /* Step 3: assert EN */ 204 ctrl |= 0x8; 205 GPIO_SET(PHDR, ctrl); 206 207 /* Step 4: pulse time delay */ 208 delay(1); 209 210 /* Step 5: de-assert EN */ 211 ctrl &= ~0x8; 212 GPIO_SET(PHDR, ctrl); 213 214 /* Step 6: hold time delay */ 215 delay(1); 216 217 /* Step 7: de-assert WR */ 218 ctrl |= 0x2; 219 GPIO_SET(PHDR, ctrl); 220 221 /* Step 8: minimum delay till next bus-cycle */ 222 delay(1000); 223 } 224 225 static u_int8_t 226 tslcd_readreg(hd, en, rs) 227 struct hd44780_chip *hd; 228 u_int32_t en, rs; 229 { 230 struct tslcd_softc *sc = (struct tslcd_softc *)hd->sc_dev; 231 u_int8_t ret, ctrl; 232 233 if (hd->sc_dev_ok == 0) 234 return 0; 235 236 /* Step 1: Apply RS & WR, Send data */ 237 ctrl = GPIO_GET(PHDR); 238 GPIO_SET(PADDR, 0x0); /* set port A to inputs */ 239 if (rs) { 240 ctrl |= 0x30; /* de-assert WR, assert RS */ 241 } else { 242 ctrl |= 0x20; /* de-assert WR */ 243 ctrl &= ~0x10; /* de-assert RS */ 244 } 245 GPIO_SET(PHDR, ctrl); 246 247 /* Step 2: setup time delay */ 248 delay(1); 249 250 /* Step 3: assert EN */ 251 ctrl |= 0x8; 252 GPIO_SET(PHDR, ctrl); 253 254 /* Step 4: pulse time delay */ 255 delay(1); 256 257 /* Step 5: de-assert EN */ 258 ret = GPIO_GET(PADR) & 0xff; 259 ctrl &= ~0x8; 260 GPIO_SET(PHDR, ctrl); 261 262 /* Step 6: hold time delay + min bus cycle interval*/ 263 delay(1000); 264 return ret; 265 } 266 267 int 268 tslcdopen(dev, flag, mode, l) 269 dev_t dev; 270 int flag, mode; 271 struct lwp *l; 272 { 273 struct tslcd_softc *sc = device_lookup(&tslcd_cd, minor(dev)); 274 275 if (sc->sc_hlcd.sc_dev_ok == 0) 276 return hd44780_init(&sc->sc_hlcd); 277 else 278 return 0; 279 } 280 281 int 282 tslcdclose(dev, flag, mode, l) 283 dev_t dev; 284 int flag, mode; 285 struct lwp *l; 286 { 287 return 0; 288 } 289 290 int 291 tslcdread(dev, uio, flag) 292 dev_t dev; 293 struct uio *uio; 294 int flag; 295 { 296 return EIO; 297 } 298 299 int 300 tslcdwrite(dev, uio, flag) 301 dev_t dev; 302 struct uio *uio; 303 int flag; 304 { 305 int error; 306 struct hd44780_io io; 307 struct tslcd_softc *sc = device_lookup(&tslcd_cd, minor(dev)); 308 309 if (sc->sc_hlcd.sc_dev_ok == 0) 310 return EIO; 311 312 io.dat = 0; 313 io.len = uio->uio_resid; 314 if (io.len > HD_MAX_CHARS) 315 io.len = HD_MAX_CHARS; 316 317 if ((error = uiomove((void*)io.buf, io.len, uio)) != 0) 318 return error; 319 320 hd44780_ddram_redraw(&sc->sc_hlcd, sc->sc_hlcd.sc_curchip, &io); 321 return 0; 322 } 323 324 int 325 tslcdioctl(dev, cmd, data, flag, l) 326 dev_t dev; 327 u_long cmd; 328 caddr_t data; 329 int flag; 330 struct lwp *l; 331 { 332 struct tslcd_softc *sc = device_lookup(&tslcd_cd, minor(dev)); 333 return hd44780_ioctl_subr(&sc->sc_hlcd, cmd, data); 334 } 335 336 int 337 tslcdpoll(dev, events, l) 338 dev_t dev; 339 int events; 340 struct lwp *l; 341 { 342 return 0; 343 } 344
Indexes created Wed Oct 01 19:09:53 GMT 2025