/* $NetBSD: toasterlcd.c,v 1.11 2012/10/27 17:18:25 chs Exp $ */ /*- * Copyright (c) 1998 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Jesse Off. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include __KERNEL_RCSID(0, "$NetBSD: toasterlcd.c,v 1.11 2012/10/27 17:18:25 chs Exp $"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include struct toasterlcd_softc { device_t sc_dev; struct hd44780_chip sc_hlcd; bus_space_tag_t sc_iot; bus_space_handle_t sc_gpioh; }; static int toasterlcd_match(device_t, cfdata_t, void *); static void toasterlcd_attach(device_t, device_t, void *); static void toasterlcd_writereg(struct hd44780_chip *, u_int32_t, u_int32_t, u_int8_t); static u_int8_t toasterlcd_readreg(struct hd44780_chip *, u_int32_t, u_int32_t); extern const struct wsdisplay_emulops hlcd_emulops; extern const struct wsdisplay_accessops hlcd_accessops; extern struct cfdriver toasterlcd_cd; CFATTACH_DECL_NEW(toasterlcd, sizeof(struct toasterlcd_softc), toasterlcd_match, toasterlcd_attach, NULL, NULL); static const struct wsscreen_descr toasterlcd_stdscreen = { "std_toasterlcd", 40, 4, &hlcd_emulops, 5, 7, 0, }; static const struct wsscreen_descr *_toasterlcd_scrlist[] = { &toasterlcd_stdscreen, }; static const struct wsscreen_list toasterlcd_screenlist = { sizeof(_toasterlcd_scrlist) / sizeof(struct wsscreen_descr *), _toasterlcd_scrlist, }; static int toasterlcd_match(device_t parent, cfdata_t match, void *aux) { return 1; } #define TSDIO_GET(x) bus_space_read_1(sc->sc_iot, sc->sc_gpioh, \ (TSDIO_ ## x)) #define TSDIO_SET(x, y) bus_space_write_1(sc->sc_iot, sc->sc_gpioh, \ (TSDIO_ ## x), (y)) #define TSDIO_SETBITS(x, y) bus_space_write_1(sc->sc_iot, sc->sc_gpioh, \ (TSDIO_ ## x), TSDIO_GET(x) | (y)) #define TSDIO_CLEARBITS(x, y) bus_space_write_1(sc->sc_iot, sc->sc_gpioh, \ (TSDIO_ ## x), TSDIO_GET(x) & (~(y))) static void toasterlcd_attach(device_t parent, device_t self, void *aux) { struct toasterlcd_softc *sc = device_private(self); struct tsdio_attach_args *taa = aux; struct wsemuldisplaydev_attach_args waa; sc->sc_iot = taa->ta_iot; sc->sc_gpioh = taa->ta_ioh; sc->sc_hlcd.sc_dev_ok = 1; sc->sc_hlcd.sc_cols = 40; sc->sc_hlcd.sc_vcols = 40; sc->sc_hlcd.sc_flags = HD_8BIT | HD_MULTILINE | HD_MULTICHIP; sc->sc_hlcd.sc_dev = self; sc->sc_hlcd.sc_writereg = toasterlcd_writereg; sc->sc_hlcd.sc_readreg = toasterlcd_readreg; TSDIO_SETBITS(DDR, 0x2); /* Port B as outputs */ TSDIO_CLEARBITS(DDR, 0x1); /* Port C as inputs */ TSDIO_CLEARBITS(PBDR, 0xd); /* De-assert EN, De-assert RS */ aprint_normal(": 4x40 text-mode hd44780 LCD\n"); aprint_normal_dev(sc->sc_dev, "using port C, bits 0-7 as DB0-DB7\n"); aprint_normal_dev(sc->sc_dev, "using port B, bits 0-3 as RS, WR, EN1, EN2\n"); hd44780_attach_subr(&sc->sc_hlcd); waa.console = 0; waa.scrdata = &toasterlcd_screenlist; waa.accessops = &hlcd_accessops; waa.accesscookie = &sc->sc_hlcd.sc_screen; config_found(self, &waa, wsemuldisplaydevprint); } static void toasterlcd_writereg(struct hd44780_chip *hd, u_int32_t en, u_int32_t rs, u_int8_t cmd) { struct toasterlcd_softc *sc = device_private(hd->sc_dev); u_int8_t ctrl; if (hd->sc_dev_ok == 0) return; /* Step 1: Apply RS & WR, Send data */ ctrl = TSDIO_GET(PBDR); TSDIO_SETBITS(DDR, 0x1); /* set port C to outputs */ TSDIO_SET(PCDR, cmd); if (rs) { ctrl |= 0x1; /* assert RS */ ctrl &= ~0x2; /* assert WR */ } else { ctrl &= ~0x3; /* assert WR, de-assert RS */ } TSDIO_SET(PBDR, ctrl); /* Step 2: setup time delay */ delay(1); /* Step 3: assert EN */ if (en == 1) ctrl |= 0x8; else ctrl |= 0x4; TSDIO_SET(PBDR, ctrl); /* Step 4: pulse time delay */ delay(1); /* Step 5: de-assert EN */ if (en == 1) ctrl &= ~0x8; else ctrl &= ~0x4; TSDIO_SET(PBDR, ctrl); /* Step 6: hold time delay */ delay(1); /* Step 7: de-assert WR */ ctrl |= 0x2; TSDIO_SET(PBDR, ctrl); /* Step 8: minimum delay till next bus-cycle */ delay(1000); } static u_int8_t toasterlcd_readreg(struct hd44780_chip *hd, u_int32_t en, u_int32_t rs) { struct toasterlcd_softc *sc = device_private(hd->sc_dev); u_int8_t ret, ctrl; if (hd->sc_dev_ok == 0) return 0; /* Step 1: Apply RS & WR, Send data */ ctrl = TSDIO_GET(PBDR); TSDIO_CLEARBITS(DDR, 0x1); /* set port C to inputs */ if (rs) { ctrl |= 0x3; /* de-assert WR, assert RS */ } else { ctrl |= 0x2; /* de-assert WR */ ctrl &= ~0x1; /* de-assert RS */ } TSDIO_SET(PBDR, ctrl); /* Step 2: setup time delay */ delay(1); /* Step 3: assert EN */ if (en == 1) ctrl |= 0x8; else ctrl |= 0x4; TSDIO_SET(PBDR, ctrl); /* Step 4: pulse time delay */ delay(1); /* Step 5: de-assert EN */ ret = TSDIO_GET(PCDR) & 0xff; if (en == 1) ctrl &= ~0x8; else ctrl &= ~0x4; TSDIO_SET(PBDR, ctrl); /* Step 6: hold time delay + min bus cycle interval*/ delay(1000); return ret; }