1 /* $NetBSD: tslcd.c,v 1.11 2008/06/11 23:24:43 cegger 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 1.11 2008/06/11 23:24:43 cegger 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 <machine/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 device sc_dev; 62 struct hd44780_chip sc_hlcd; 63 bus_space_tag_t sc_iot; 64 bus_space_handle_t sc_gpioh; 65 }; 66 67 static int tslcd_match(struct device *, struct cfdata *, void *); 68 static void tslcd_attach(struct device *, struct device *, void *); 69 70 static void tslcd_writereg(struct hd44780_chip *, u_int32_t, u_int32_t, u_int8_t); 71 static u_int8_t tslcd_readreg(struct hd44780_chip *, u_int32_t, u_int32_t); 72 73 dev_type_open(tslcdopen); 74 dev_type_close(tslcdclose); 75 dev_type_read(tslcdread); 76 dev_type_write(tslcdwrite); 77 dev_type_ioctl(tslcdioctl); 78 dev_type_poll(tslcdpoll); 79 80 const struct cdevsw tslcd_cdevsw = { 81 tslcdopen, tslcdclose, tslcdread, tslcdwrite, tslcdioctl, 82 nostop, notty, tslcdpoll, nommap, 83 }; 84 85 extern const struct wsdisplay_emulops hlcd_emulops; 86 extern const struct wsdisplay_accessops hlcd_accessops; 87 extern struct cfdriver tslcd_cd; 88 89 CFATTACH_DECL(tslcd, sizeof(struct tslcd_softc), 90 tslcd_match, tslcd_attach, NULL, NULL); 91 92 static const struct wsscreen_descr tslcd_stdscreen = { 93 "std_tslcd", 24, 2, 94 &hlcd_emulops, 95 5, 7, 96 0, 97 }; 98 99 static const struct wsscreen_descr *_tslcd_scrlist[] = { 100 &tslcd_stdscreen, 101 }; 102 103 static const struct wsscreen_list tslcd_screenlist = { 104 sizeof(_tslcd_scrlist) / sizeof(struct wsscreen_descr *), 105 _tslcd_scrlist, 106 }; 107 108 static int 109 tslcd_match(parent, match, aux) 110 struct device *parent; 111 struct cfdata *match; 112 void *aux; 113 { 114 return 1; 115 } 116 117 #define GPIO_GET(x) bus_space_read_1(sc->sc_iot, sc->sc_gpioh, \ 118 (EP93XX_GPIO_ ## x)) 119 120 #define GPIO_SET(x, y) bus_space_write_1(sc->sc_iot, sc->sc_gpioh, \ 121 (EP93XX_GPIO_ ## x), (y)) 122 123 #define GPIO_SETBITS(x, y) bus_space_write_1(sc->sc_iot, sc->sc_gpioh, \ 124 (EP93XX_GPIO_ ## x), GPIO_GET(x) | (y)) 125 126 #define GPIO_CLEARBITS(x, y) bus_space_write_1(sc->sc_iot, sc->sc_gpioh, \ 127 (EP93XX_GPIO_ ## x), GPIO_GET(x) & (~(y))) 128 129 static void 130 tslcd_attach(parent, self, aux) 131 struct device *parent; 132 struct device *self; 133 void *aux; 134 { 135 struct tslcd_softc *sc = (void *)self; 136 struct tspld_attach_args *taa = aux; 137 struct wsemuldisplaydev_attach_args waa; 138 139 sc->sc_iot = taa->ta_iot; 140 if (bus_space_map(sc->sc_iot, EP93XX_APB_HWBASE + EP93XX_APB_GPIO, 141 EP93XX_APB_GPIO_SIZE, 0, &sc->sc_gpioh)) 142 panic("tslcd_attach: couldn't map GPIO registers"); 143 144 sc->sc_hlcd.sc_dev_ok = 1; 145 sc->sc_hlcd.sc_cols = 24; 146 sc->sc_hlcd.sc_vcols = 40; 147 sc->sc_hlcd.sc_flags = HD_8BIT | HD_MULTILINE; 148 sc->sc_hlcd.sc_dev = self; 149 150 sc->sc_hlcd.sc_writereg = tslcd_writereg; 151 sc->sc_hlcd.sc_readreg = tslcd_readreg; 152 153 GPIO_SET(PADDR, 0); /* Port A to inputs */ 154 GPIO_SETBITS(PHDDR, 0x38); /* Bits 3:5 of Port H to outputs */ 155 GPIO_CLEARBITS(PHDR, 0x18); /* De-assert EN, De-assert RS */ 156 157 printf("\n"); 158 159 hd44780_attach_subr(&sc->sc_hlcd); 160 161 waa.console = 0; 162 waa.scrdata = &tslcd_screenlist; 163 waa.accessops = &hlcd_accessops; 164 waa.accesscookie = &sc->sc_hlcd.sc_screen; 165 config_found(self, &waa, wsemuldisplaydevprint); 166 } 167 168 static void 169 tslcd_writereg(hd, en, rs, cmd) 170 struct hd44780_chip *hd; 171 u_int32_t en, rs; 172 u_int8_t cmd; 173 { 174 struct tslcd_softc *sc = (struct tslcd_softc *)hd->sc_dev; 175 u_int8_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 u_int8_t 218 tslcd_readreg(hd, en, rs) 219 struct hd44780_chip *hd; 220 u_int32_t en, rs; 221 { 222 struct tslcd_softc *sc = (struct tslcd_softc *)hd->sc_dev; 223 u_int8_t ret, ctrl; 224 225 if (hd->sc_dev_ok == 0) 226 return 0; 227 228 /* Step 1: Apply RS & WR, Send data */ 229 ctrl = GPIO_GET(PHDR); 230 GPIO_SET(PADDR, 0x0); /* set port A to inputs */ 231 if (rs) { 232 ctrl |= 0x30; /* de-assert WR, assert RS */ 233 } else { 234 ctrl |= 0x20; /* de-assert WR */ 235 ctrl &= ~0x10; /* de-assert RS */ 236 } 237 GPIO_SET(PHDR, ctrl); 238 239 /* Step 2: setup time delay */ 240 delay(1); 241 242 /* Step 3: assert EN */ 243 ctrl |= 0x8; 244 GPIO_SET(PHDR, ctrl); 245 246 /* Step 4: pulse time delay */ 247 delay(1); 248 249 /* Step 5: de-assert EN */ 250 ret = GPIO_GET(PADR) & 0xff; 251 ctrl &= ~0x8; 252 GPIO_SET(PHDR, ctrl); 253 254 /* Step 6: hold time delay + min bus cycle interval*/ 255 delay(1000); 256 return ret; 257 } 258 259 int 260 tslcdopen(dev_t dev, int flag, int mode, struct lwp *l) 261 { 262 struct tslcd_softc *sc = device_lookup_private(&tslcd_cd, minor(dev)); 263 264 if (sc->sc_hlcd.sc_dev_ok == 0) 265 return hd44780_init(&sc->sc_hlcd); 266 else 267 return 0; 268 } 269 270 int 271 tslcdclose(dev_t dev, int flag, int mode, struct lwp *l) 272 { 273 return 0; 274 } 275 276 int 277 tslcdread(dev_t dev, struct uio *uio, int flag) 278 { 279 return EIO; 280 } 281 282 int 283 tslcdwrite(dev_t dev, struct uio *uio, int flag) 284 { 285 int error; 286 struct hd44780_io io; 287 struct tslcd_softc *sc = device_lookup_private(&tslcd_cd, minor(dev)); 288 289 if (sc->sc_hlcd.sc_dev_ok == 0) 290 return EIO; 291 292 io.dat = 0; 293 io.len = uio->uio_resid; 294 if (io.len > HD_MAX_CHARS) 295 io.len = HD_MAX_CHARS; 296 297 if ((error = uiomove((void*)io.buf, io.len, uio)) != 0) 298 return error; 299 300 hd44780_ddram_redraw(&sc->sc_hlcd, sc->sc_hlcd.sc_curchip, &io); 301 return 0; 302 } 303 304 int 305 tslcdioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 306 { 307 struct tslcd_softc *sc = device_lookup_private(&tslcd_cd, minor(dev)); 308 return hd44780_ioctl_subr(&sc->sc_hlcd, cmd, data); 309 } 310 311 int 312 tslcdpoll(dev_t dev, int events, struct lwp *l) 313 { 314 return 0; 315 } 316