1 /* $NetBSD: tslcd.c,v 1.16 2012/11/12 18:00:40 skrll 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 1.16 2012/11/12 18:00:40 skrll 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 tslcdopen, tslcdclose, tslcdread, tslcdwrite, tslcdioctl, 81 nostop, notty, tslcdpoll, nommap, 82 }; 83 84 extern const struct wsdisplay_emulops hlcd_emulops; 85 extern const struct wsdisplay_accessops hlcd_accessops; 86 extern struct cfdriver tslcd_cd; 87 88 CFATTACH_DECL_NEW(tslcd, sizeof(struct tslcd_softc), 89 tslcd_match, tslcd_attach, NULL, NULL); 90 91 static const struct wsscreen_descr tslcd_stdscreen = { 92 "std_tslcd", 24, 2, 93 &hlcd_emulops, 94 5, 7, 95 0, 96 }; 97 98 static const struct wsscreen_descr *_tslcd_scrlist[] = { 99 &tslcd_stdscreen, 100 }; 101 102 static const struct wsscreen_list tslcd_screenlist = { 103 sizeof(_tslcd_scrlist) / sizeof(struct wsscreen_descr *), 104 _tslcd_scrlist, 105 }; 106 107 static int 108 tslcd_match(device_t parent, cfdata_t match, void *aux) 109 { 110 return 1; 111 } 112 113 #define GPIO_GET(x) bus_space_read_1(sc->sc_iot, sc->sc_gpioh, \ 114 (EP93XX_GPIO_ ## x)) 115 116 #define GPIO_SET(x, y) bus_space_write_1(sc->sc_iot, sc->sc_gpioh, \ 117 (EP93XX_GPIO_ ## x), (y)) 118 119 #define GPIO_SETBITS(x, y) bus_space_write_1(sc->sc_iot, sc->sc_gpioh, \ 120 (EP93XX_GPIO_ ## x), GPIO_GET(x) | (y)) 121 122 #define GPIO_CLEARBITS(x, y) bus_space_write_1(sc->sc_iot, sc->sc_gpioh, \ 123 (EP93XX_GPIO_ ## x), GPIO_GET(x) & (~(y))) 124 125 static void 126 tslcd_attach(device_t parent, device_t self, void *aux) 127 { 128 struct tslcd_softc *sc = device_private(self); 129 struct tspld_attach_args *taa = aux; 130 struct wsemuldisplaydev_attach_args waa; 131 132 sc->sc_iot = taa->ta_iot; 133 if (bus_space_map(sc->sc_iot, EP93XX_APB_HWBASE + EP93XX_APB_GPIO, 134 EP93XX_APB_GPIO_SIZE, 0, &sc->sc_gpioh)) 135 panic("tslcd_attach: couldn't map GPIO registers"); 136 137 sc->sc_hlcd.sc_dev_ok = 1; 138 sc->sc_hlcd.sc_cols = 24; 139 sc->sc_hlcd.sc_vcols = 40; 140 sc->sc_hlcd.sc_flags = HD_8BIT | HD_MULTILINE; 141 sc->sc_hlcd.sc_dev = self; 142 143 sc->sc_hlcd.sc_writereg = tslcd_writereg; 144 sc->sc_hlcd.sc_readreg = tslcd_readreg; 145 146 GPIO_SET(PADDR, 0); /* Port A to inputs */ 147 GPIO_SETBITS(PHDDR, 0x38); /* Bits 3:5 of Port H to outputs */ 148 GPIO_CLEARBITS(PHDR, 0x18); /* De-assert EN, De-assert RS */ 149 150 printf("\n"); 151 152 hd44780_attach_subr(&sc->sc_hlcd); 153 154 waa.console = 0; 155 waa.scrdata = &tslcd_screenlist; 156 waa.accessops = &hlcd_accessops; 157 waa.accesscookie = &sc->sc_hlcd.sc_screen; 158 config_found(self, &waa, wsemuldisplaydevprint); 159 } 160 161 static void 162 tslcd_writereg(struct hd44780_chip *hd, uint32_t en, uint32_t rs, uint8_t cmd) 163 { 164 struct tslcd_softc *sc = device_private(hd->sc_dev); 165 uint8_t ctrl; 166 167 if (hd->sc_dev_ok == 0) 168 return; 169 170 /* Step 1: Apply RS & WR, Send data */ 171 ctrl = GPIO_GET(PHDR); 172 GPIO_SET(PADDR, 0xff); /* set port A to outputs */ 173 GPIO_SET(PADR, cmd); 174 if (rs) { 175 ctrl |= 0x10; /* assert RS */ 176 ctrl &= ~0x20; /* assert WR */ 177 } else { 178 ctrl &= ~0x30; /* de-assert WR, de-assert RS */ 179 } 180 GPIO_SET(PHDR, ctrl); 181 182 /* Step 2: setup time delay */ 183 delay(1); 184 185 /* Step 3: assert EN */ 186 ctrl |= 0x8; 187 GPIO_SET(PHDR, ctrl); 188 189 /* Step 4: pulse time delay */ 190 delay(1); 191 192 /* Step 5: de-assert EN */ 193 ctrl &= ~0x8; 194 GPIO_SET(PHDR, ctrl); 195 196 /* Step 6: hold time delay */ 197 delay(1); 198 199 /* Step 7: de-assert WR */ 200 ctrl |= 0x2; 201 GPIO_SET(PHDR, ctrl); 202 203 /* Step 8: minimum delay till next bus-cycle */ 204 delay(1000); 205 } 206 207 static uint8_t 208 tslcd_readreg(struct hd44780_chip *hd, uint32_t en, uint32_t rs) 209 { 210 struct tslcd_softc *sc = device_private(hd->sc_dev); 211 uint8_t ret, ctrl; 212 213 if (hd->sc_dev_ok == 0) 214 return 0; 215 216 /* Step 1: Apply RS & WR, Send data */ 217 ctrl = GPIO_GET(PHDR); 218 GPIO_SET(PADDR, 0x0); /* set port A to inputs */ 219 if (rs) { 220 ctrl |= 0x30; /* de-assert WR, assert RS */ 221 } else { 222 ctrl |= 0x20; /* de-assert WR */ 223 ctrl &= ~0x10; /* de-assert RS */ 224 } 225 GPIO_SET(PHDR, ctrl); 226 227 /* Step 2: setup time delay */ 228 delay(1); 229 230 /* Step 3: assert EN */ 231 ctrl |= 0x8; 232 GPIO_SET(PHDR, ctrl); 233 234 /* Step 4: pulse time delay */ 235 delay(1); 236 237 /* Step 5: de-assert EN */ 238 ret = GPIO_GET(PADR) & 0xff; 239 ctrl &= ~0x8; 240 GPIO_SET(PHDR, ctrl); 241 242 /* Step 6: hold time delay + min bus cycle interval*/ 243 delay(1000); 244 return ret; 245 } 246 247 int 248 tslcdopen(dev_t dev, int flag, int mode, struct lwp *l) 249 { 250 struct tslcd_softc *sc = device_lookup_private(&tslcd_cd, minor(dev)); 251 252 if (sc->sc_hlcd.sc_dev_ok == 0) 253 return hd44780_init(&sc->sc_hlcd); 254 else 255 return 0; 256 } 257 258 int 259 tslcdclose(dev_t dev, int flag, int mode, struct lwp *l) 260 { 261 return 0; 262 } 263 264 int 265 tslcdread(dev_t dev, struct uio *uio, int flag) 266 { 267 return EIO; 268 } 269 270 int 271 tslcdwrite(dev_t dev, struct uio *uio, int flag) 272 { 273 int error; 274 struct hd44780_io io; 275 struct tslcd_softc *sc = device_lookup_private(&tslcd_cd, minor(dev)); 276 277 if (sc->sc_hlcd.sc_dev_ok == 0) 278 return EIO; 279 280 io.dat = 0; 281 io.len = uio->uio_resid; 282 if (io.len > HD_MAX_CHARS) 283 io.len = HD_MAX_CHARS; 284 285 if ((error = uiomove((void*)io.buf, io.len, uio)) != 0) 286 return error; 287 288 hd44780_ddram_redraw(&sc->sc_hlcd, sc->sc_hlcd.sc_curchip, &io); 289 return 0; 290 } 291 292 int 293 tslcdioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 294 { 295 struct tslcd_softc *sc = device_lookup_private(&tslcd_cd, minor(dev)); 296 return hd44780_ioctl_subr(&sc->sc_hlcd, cmd, data); 297 } 298 299 int 300 tslcdpoll(dev_t dev, int events, struct lwp *l) 301 { 302 return 0; 303 } 304