1 /* $NetBSD: tslcd.c,v 1.20 2021/08/07 16:18:50 thorpej 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 1.20 2021/08/07 16:18:50 thorpej 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_discard = nodiscard, 91 .d_flag = 0 92 }; 93 94 extern const struct wsdisplay_emulops hlcd_emulops; 95 extern const struct wsdisplay_accessops hlcd_accessops; 96 extern struct cfdriver tslcd_cd; 97 98 CFATTACH_DECL_NEW(tslcd, sizeof(struct tslcd_softc), 99 tslcd_match, tslcd_attach, NULL, NULL); 100 101 static const struct wsscreen_descr tslcd_stdscreen = { 102 "std_tslcd", 24, 2, 103 &hlcd_emulops, 104 5, 7, 105 0, 106 }; 107 108 static const struct wsscreen_descr *_tslcd_scrlist[] = { 109 &tslcd_stdscreen, 110 }; 111 112 static const struct wsscreen_list tslcd_screenlist = { 113 sizeof(_tslcd_scrlist) / sizeof(struct wsscreen_descr *), 114 _tslcd_scrlist, 115 }; 116 117 static int 118 tslcd_match(device_t parent, cfdata_t match, void *aux) 119 { 120 return 1; 121 } 122 123 #define GPIO_GET(x) bus_space_read_1(sc->sc_iot, sc->sc_gpioh, \ 124 (EP93XX_GPIO_ ## x)) 125 126 #define GPIO_SET(x, y) bus_space_write_1(sc->sc_iot, sc->sc_gpioh, \ 127 (EP93XX_GPIO_ ## x), (y)) 128 129 #define GPIO_SETBITS(x, y) bus_space_write_1(sc->sc_iot, sc->sc_gpioh, \ 130 (EP93XX_GPIO_ ## x), GPIO_GET(x) | (y)) 131 132 #define GPIO_CLEARBITS(x, y) bus_space_write_1(sc->sc_iot, sc->sc_gpioh, \ 133 (EP93XX_GPIO_ ## x), GPIO_GET(x) & (~(y))) 134 135 static void 136 tslcd_attach(device_t parent, device_t self, void *aux) 137 { 138 struct tslcd_softc *sc = device_private(self); 139 struct tspld_attach_args *taa = aux; 140 struct wsemuldisplaydev_attach_args waa; 141 142 sc->sc_iot = taa->ta_iot; 143 if (bus_space_map(sc->sc_iot, EP93XX_APB_HWBASE + EP93XX_APB_GPIO, 144 EP93XX_APB_GPIO_SIZE, 0, &sc->sc_gpioh)) 145 panic("tslcd_attach: couldn't map GPIO registers"); 146 147 sc->sc_hlcd.sc_dev_ok = 1; 148 sc->sc_hlcd.sc_cols = 24; 149 sc->sc_hlcd.sc_vcols = 40; 150 sc->sc_hlcd.sc_flags = HD_8BIT | HD_MULTILINE; 151 sc->sc_hlcd.sc_dev = self; 152 153 sc->sc_hlcd.sc_writereg = tslcd_writereg; 154 sc->sc_hlcd.sc_readreg = tslcd_readreg; 155 156 GPIO_SET(PADDR, 0); /* Port A to inputs */ 157 GPIO_SETBITS(PHDDR, 0x38); /* Bits 3:5 of Port H to outputs */ 158 GPIO_CLEARBITS(PHDR, 0x18); /* De-assert EN, De-assert RS */ 159 160 printf("\n"); 161 162 hd44780_attach_subr(&sc->sc_hlcd); 163 164 waa.console = 0; 165 waa.scrdata = &tslcd_screenlist; 166 waa.accessops = &hlcd_accessops; 167 waa.accesscookie = &sc->sc_hlcd.sc_screen; 168 config_found(self, &waa, wsemuldisplaydevprint, CFARGS_NONE); 169 } 170 171 static void 172 tslcd_writereg(struct hd44780_chip *hd, uint32_t en, uint32_t rs, uint8_t cmd) 173 { 174 struct tslcd_softc *sc = device_private(hd->sc_dev); 175 uint8_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 uint8_t 218 tslcd_readreg(struct hd44780_chip *hd, uint32_t en, uint32_t rs) 219 { 220 struct tslcd_softc *sc = device_private(hd->sc_dev); 221 uint8_t ret, ctrl; 222 223 if (hd->sc_dev_ok == 0) 224 return 0; 225 226 /* Step 1: Apply RS & WR, Send data */ 227 ctrl = GPIO_GET(PHDR); 228 GPIO_SET(PADDR, 0x0); /* set port A to inputs */ 229 if (rs) { 230 ctrl |= 0x30; /* de-assert WR, assert RS */ 231 } else { 232 ctrl |= 0x20; /* de-assert WR */ 233 ctrl &= ~0x10; /* de-assert RS */ 234 } 235 GPIO_SET(PHDR, ctrl); 236 237 /* Step 2: setup time delay */ 238 delay(1); 239 240 /* Step 3: assert EN */ 241 ctrl |= 0x8; 242 GPIO_SET(PHDR, ctrl); 243 244 /* Step 4: pulse time delay */ 245 delay(1); 246 247 /* Step 5: de-assert EN */ 248 ret = GPIO_GET(PADR) & 0xff; 249 ctrl &= ~0x8; 250 GPIO_SET(PHDR, ctrl); 251 252 /* Step 6: hold time delay + min bus cycle interval*/ 253 delay(1000); 254 return ret; 255 } 256 257 int 258 tslcdopen(dev_t dev, int flag, int mode, struct lwp *l) 259 { 260 struct tslcd_softc *sc = device_lookup_private(&tslcd_cd, minor(dev)); 261 262 if (sc->sc_hlcd.sc_dev_ok == 0) 263 return hd44780_init(&sc->sc_hlcd); 264 else 265 return 0; 266 } 267 268 int 269 tslcdclose(dev_t dev, int flag, int mode, struct lwp *l) 270 { 271 return 0; 272 } 273 274 int 275 tslcdread(dev_t dev, struct uio *uio, int flag) 276 { 277 return EIO; 278 } 279 280 int 281 tslcdwrite(dev_t dev, struct uio *uio, int flag) 282 { 283 int error; 284 struct hd44780_io io; 285 struct tslcd_softc *sc = device_lookup_private(&tslcd_cd, minor(dev)); 286 287 if (sc->sc_hlcd.sc_dev_ok == 0) 288 return EIO; 289 290 io.dat = 0; 291 io.len = uio->uio_resid; 292 if (io.len > HD_MAX_CHARS) 293 io.len = HD_MAX_CHARS; 294 295 if ((error = uiomove((void*)io.buf, io.len, uio)) != 0) 296 return error; 297 298 hd44780_ddram_redraw(&sc->sc_hlcd, sc->sc_hlcd.sc_curchip, &io); 299 return 0; 300 } 301 302 int 303 tslcdioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 304 { 305 struct tslcd_softc *sc = device_lookup_private(&tslcd_cd, minor(dev)); 306 return hd44780_ioctl_subr(&sc->sc_hlcd, cmd, data); 307 } 308 309 int 310 tslcdpoll(dev_t dev, int events, struct lwp *l) 311 { 312 return 0; 313 } 314