1 /* $NetBSD: tslcd.c,v 1.17 2014/03/16 05:20:24 dholland 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 1.17 2014/03/16 05:20:24 dholland 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_flag = 0 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_NEW(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(device_t parent, cfdata_t match, void *aux) 118 { 119 return 1; 120 } 121 122 #define GPIO_GET(x) bus_space_read_1(sc->sc_iot, sc->sc_gpioh, \ 123 (EP93XX_GPIO_ ## x)) 124 125 #define GPIO_SET(x, y) bus_space_write_1(sc->sc_iot, sc->sc_gpioh, \ 126 (EP93XX_GPIO_ ## x), (y)) 127 128 #define GPIO_SETBITS(x, y) bus_space_write_1(sc->sc_iot, sc->sc_gpioh, \ 129 (EP93XX_GPIO_ ## x), GPIO_GET(x) | (y)) 130 131 #define GPIO_CLEARBITS(x, y) bus_space_write_1(sc->sc_iot, sc->sc_gpioh, \ 132 (EP93XX_GPIO_ ## x), GPIO_GET(x) & (~(y))) 133 134 static void 135 tslcd_attach(device_t parent, device_t self, void *aux) 136 { 137 struct tslcd_softc *sc = device_private(self); 138 struct tspld_attach_args *taa = aux; 139 struct wsemuldisplaydev_attach_args waa; 140 141 sc->sc_iot = taa->ta_iot; 142 if (bus_space_map(sc->sc_iot, EP93XX_APB_HWBASE + EP93XX_APB_GPIO, 143 EP93XX_APB_GPIO_SIZE, 0, &sc->sc_gpioh)) 144 panic("tslcd_attach: couldn't map GPIO registers"); 145 146 sc->sc_hlcd.sc_dev_ok = 1; 147 sc->sc_hlcd.sc_cols = 24; 148 sc->sc_hlcd.sc_vcols = 40; 149 sc->sc_hlcd.sc_flags = HD_8BIT | HD_MULTILINE; 150 sc->sc_hlcd.sc_dev = self; 151 152 sc->sc_hlcd.sc_writereg = tslcd_writereg; 153 sc->sc_hlcd.sc_readreg = tslcd_readreg; 154 155 GPIO_SET(PADDR, 0); /* Port A to inputs */ 156 GPIO_SETBITS(PHDDR, 0x38); /* Bits 3:5 of Port H to outputs */ 157 GPIO_CLEARBITS(PHDR, 0x18); /* De-assert EN, De-assert RS */ 158 159 printf("\n"); 160 161 hd44780_attach_subr(&sc->sc_hlcd); 162 163 waa.console = 0; 164 waa.scrdata = &tslcd_screenlist; 165 waa.accessops = &hlcd_accessops; 166 waa.accesscookie = &sc->sc_hlcd.sc_screen; 167 config_found(self, &waa, wsemuldisplaydevprint); 168 } 169 170 static void 171 tslcd_writereg(struct hd44780_chip *hd, uint32_t en, uint32_t rs, uint8_t cmd) 172 { 173 struct tslcd_softc *sc = device_private(hd->sc_dev); 174 uint8_t ctrl; 175 176 if (hd->sc_dev_ok == 0) 177 return; 178 179 /* Step 1: Apply RS & WR, Send data */ 180 ctrl = GPIO_GET(PHDR); 181 GPIO_SET(PADDR, 0xff); /* set port A to outputs */ 182 GPIO_SET(PADR, cmd); 183 if (rs) { 184 ctrl |= 0x10; /* assert RS */ 185 ctrl &= ~0x20; /* assert WR */ 186 } else { 187 ctrl &= ~0x30; /* de-assert WR, de-assert RS */ 188 } 189 GPIO_SET(PHDR, ctrl); 190 191 /* Step 2: setup time delay */ 192 delay(1); 193 194 /* Step 3: assert EN */ 195 ctrl |= 0x8; 196 GPIO_SET(PHDR, ctrl); 197 198 /* Step 4: pulse time delay */ 199 delay(1); 200 201 /* Step 5: de-assert EN */ 202 ctrl &= ~0x8; 203 GPIO_SET(PHDR, ctrl); 204 205 /* Step 6: hold time delay */ 206 delay(1); 207 208 /* Step 7: de-assert WR */ 209 ctrl |= 0x2; 210 GPIO_SET(PHDR, ctrl); 211 212 /* Step 8: minimum delay till next bus-cycle */ 213 delay(1000); 214 } 215 216 static uint8_t 217 tslcd_readreg(struct hd44780_chip *hd, uint32_t en, uint32_t rs) 218 { 219 struct tslcd_softc *sc = device_private(hd->sc_dev); 220 uint8_t ret, ctrl; 221 222 if (hd->sc_dev_ok == 0) 223 return 0; 224 225 /* Step 1: Apply RS & WR, Send data */ 226 ctrl = GPIO_GET(PHDR); 227 GPIO_SET(PADDR, 0x0); /* set port A to inputs */ 228 if (rs) { 229 ctrl |= 0x30; /* de-assert WR, assert RS */ 230 } else { 231 ctrl |= 0x20; /* de-assert WR */ 232 ctrl &= ~0x10; /* de-assert RS */ 233 } 234 GPIO_SET(PHDR, ctrl); 235 236 /* Step 2: setup time delay */ 237 delay(1); 238 239 /* Step 3: assert EN */ 240 ctrl |= 0x8; 241 GPIO_SET(PHDR, ctrl); 242 243 /* Step 4: pulse time delay */ 244 delay(1); 245 246 /* Step 5: de-assert EN */ 247 ret = GPIO_GET(PADR) & 0xff; 248 ctrl &= ~0x8; 249 GPIO_SET(PHDR, ctrl); 250 251 /* Step 6: hold time delay + min bus cycle interval*/ 252 delay(1000); 253 return ret; 254 } 255 256 int 257 tslcdopen(dev_t dev, int flag, int mode, struct lwp *l) 258 { 259 struct tslcd_softc *sc = device_lookup_private(&tslcd_cd, minor(dev)); 260 261 if (sc->sc_hlcd.sc_dev_ok == 0) 262 return hd44780_init(&sc->sc_hlcd); 263 else 264 return 0; 265 } 266 267 int 268 tslcdclose(dev_t dev, int flag, int mode, struct lwp *l) 269 { 270 return 0; 271 } 272 273 int 274 tslcdread(dev_t dev, struct uio *uio, int flag) 275 { 276 return EIO; 277 } 278 279 int 280 tslcdwrite(dev_t dev, struct uio *uio, int flag) 281 { 282 int error; 283 struct hd44780_io io; 284 struct tslcd_softc *sc = device_lookup_private(&tslcd_cd, minor(dev)); 285 286 if (sc->sc_hlcd.sc_dev_ok == 0) 287 return EIO; 288 289 io.dat = 0; 290 io.len = uio->uio_resid; 291 if (io.len > HD_MAX_CHARS) 292 io.len = HD_MAX_CHARS; 293 294 if ((error = uiomove((void*)io.buf, io.len, uio)) != 0) 295 return error; 296 297 hd44780_ddram_redraw(&sc->sc_hlcd, sc->sc_hlcd.sc_curchip, &io); 298 return 0; 299 } 300 301 int 302 tslcdioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 303 { 304 struct tslcd_softc *sc = device_lookup_private(&tslcd_cd, minor(dev)); 305 return hd44780_ioctl_subr(&sc->sc_hlcd, cmd, data); 306 } 307 308 int 309 tslcdpoll(dev_t dev, int events, struct lwp *l) 310 { 311 return 0; 312 } 313