/* $NetBSD: tslcd.c,v 1.20 2021/08/07 16:18:50 thorpej 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: tslcd.c,v 1.20 2021/08/07 16:18:50 thorpej Exp $"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include struct tslcd_softc { struct hd44780_chip sc_hlcd; bus_space_tag_t sc_iot; bus_space_handle_t sc_gpioh; }; static int tslcd_match(device_t, cfdata_t, void *); static void tslcd_attach(device_t, device_t, void *); static void tslcd_writereg(struct hd44780_chip *, uint32_t, uint32_t, uint8_t); static uint8_t tslcd_readreg(struct hd44780_chip *, uint32_t, uint32_t); dev_type_open(tslcdopen); dev_type_close(tslcdclose); dev_type_read(tslcdread); dev_type_write(tslcdwrite); dev_type_ioctl(tslcdioctl); dev_type_poll(tslcdpoll); const struct cdevsw tslcd_cdevsw = { .d_open = tslcdopen, .d_close = tslcdclose, .d_read = tslcdread, .d_write = tslcdwrite, .d_ioctl = tslcdioctl, .d_stop = nostop, .d_tty = notty, .d_poll = tslcdpoll, .d_mmap = nommap, .d_kqfilter = nokqfilter, .d_discard = nodiscard, .d_flag = 0 }; extern const struct wsdisplay_emulops hlcd_emulops; extern const struct wsdisplay_accessops hlcd_accessops; extern struct cfdriver tslcd_cd; CFATTACH_DECL_NEW(tslcd, sizeof(struct tslcd_softc), tslcd_match, tslcd_attach, NULL, NULL); static const struct wsscreen_descr tslcd_stdscreen = { "std_tslcd", 24, 2, &hlcd_emulops, 5, 7, 0, }; static const struct wsscreen_descr *_tslcd_scrlist[] = { &tslcd_stdscreen, }; static const struct wsscreen_list tslcd_screenlist = { sizeof(_tslcd_scrlist) / sizeof(struct wsscreen_descr *), _tslcd_scrlist, }; static int tslcd_match(device_t parent, cfdata_t match, void *aux) { return 1; } #define GPIO_GET(x) bus_space_read_1(sc->sc_iot, sc->sc_gpioh, \ (EP93XX_GPIO_ ## x)) #define GPIO_SET(x, y) bus_space_write_1(sc->sc_iot, sc->sc_gpioh, \ (EP93XX_GPIO_ ## x), (y)) #define GPIO_SETBITS(x, y) bus_space_write_1(sc->sc_iot, sc->sc_gpioh, \ (EP93XX_GPIO_ ## x), GPIO_GET(x) | (y)) #define GPIO_CLEARBITS(x, y) bus_space_write_1(sc->sc_iot, sc->sc_gpioh, \ (EP93XX_GPIO_ ## x), GPIO_GET(x) & (~(y))) static void tslcd_attach(device_t parent, device_t self, void *aux) { struct tslcd_softc *sc = device_private(self); struct tspld_attach_args *taa = aux; struct wsemuldisplaydev_attach_args waa; sc->sc_iot = taa->ta_iot; if (bus_space_map(sc->sc_iot, EP93XX_APB_HWBASE + EP93XX_APB_GPIO, EP93XX_APB_GPIO_SIZE, 0, &sc->sc_gpioh)) panic("tslcd_attach: couldn't map GPIO registers"); sc->sc_hlcd.sc_dev_ok = 1; sc->sc_hlcd.sc_cols = 24; sc->sc_hlcd.sc_vcols = 40; sc->sc_hlcd.sc_flags = HD_8BIT | HD_MULTILINE; sc->sc_hlcd.sc_dev = self; sc->sc_hlcd.sc_writereg = tslcd_writereg; sc->sc_hlcd.sc_readreg = tslcd_readreg; GPIO_SET(PADDR, 0); /* Port A to inputs */ GPIO_SETBITS(PHDDR, 0x38); /* Bits 3:5 of Port H to outputs */ GPIO_CLEARBITS(PHDR, 0x18); /* De-assert EN, De-assert RS */ printf("\n"); hd44780_attach_subr(&sc->sc_hlcd); waa.console = 0; waa.scrdata = &tslcd_screenlist; waa.accessops = &hlcd_accessops; waa.accesscookie = &sc->sc_hlcd.sc_screen; config_found(self, &waa, wsemuldisplaydevprint, CFARGS_NONE); } static void tslcd_writereg(struct hd44780_chip *hd, uint32_t en, uint32_t rs, uint8_t cmd) { struct tslcd_softc *sc = device_private(hd->sc_dev); uint8_t ctrl; if (hd->sc_dev_ok == 0) return; /* Step 1: Apply RS & WR, Send data */ ctrl = GPIO_GET(PHDR); GPIO_SET(PADDR, 0xff); /* set port A to outputs */ GPIO_SET(PADR, cmd); if (rs) { ctrl |= 0x10; /* assert RS */ ctrl &= ~0x20; /* assert WR */ } else { ctrl &= ~0x30; /* de-assert WR, de-assert RS */ } GPIO_SET(PHDR, ctrl); /* Step 2: setup time delay */ delay(1); /* Step 3: assert EN */ ctrl |= 0x8; GPIO_SET(PHDR, ctrl); /* Step 4: pulse time delay */ delay(1); /* Step 5: de-assert EN */ ctrl &= ~0x8; GPIO_SET(PHDR, ctrl); /* Step 6: hold time delay */ delay(1); /* Step 7: de-assert WR */ ctrl |= 0x2; GPIO_SET(PHDR, ctrl); /* Step 8: minimum delay till next bus-cycle */ delay(1000); } static uint8_t tslcd_readreg(struct hd44780_chip *hd, uint32_t en, uint32_t rs) { struct tslcd_softc *sc = device_private(hd->sc_dev); uint8_t ret, ctrl; if (hd->sc_dev_ok == 0) return 0; /* Step 1: Apply RS & WR, Send data */ ctrl = GPIO_GET(PHDR); GPIO_SET(PADDR, 0x0); /* set port A to inputs */ if (rs) { ctrl |= 0x30; /* de-assert WR, assert RS */ } else { ctrl |= 0x20; /* de-assert WR */ ctrl &= ~0x10; /* de-assert RS */ } GPIO_SET(PHDR, ctrl); /* Step 2: setup time delay */ delay(1); /* Step 3: assert EN */ ctrl |= 0x8; GPIO_SET(PHDR, ctrl); /* Step 4: pulse time delay */ delay(1); /* Step 5: de-assert EN */ ret = GPIO_GET(PADR) & 0xff; ctrl &= ~0x8; GPIO_SET(PHDR, ctrl); /* Step 6: hold time delay + min bus cycle interval*/ delay(1000); return ret; } int tslcdopen(dev_t dev, int flag, int mode, struct lwp *l) { struct tslcd_softc *sc = device_lookup_private(&tslcd_cd, minor(dev)); if (sc->sc_hlcd.sc_dev_ok == 0) return hd44780_init(&sc->sc_hlcd); else return 0; } int tslcdclose(dev_t dev, int flag, int mode, struct lwp *l) { return 0; } int tslcdread(dev_t dev, struct uio *uio, int flag) { return EIO; } int tslcdwrite(dev_t dev, struct uio *uio, int flag) { int error; struct hd44780_io io; struct tslcd_softc *sc = device_lookup_private(&tslcd_cd, minor(dev)); if (sc->sc_hlcd.sc_dev_ok == 0) return EIO; io.dat = 0; io.len = uio->uio_resid; if (io.len > HD_MAX_CHARS) io.len = HD_MAX_CHARS; if ((error = uiomove((void*)io.buf, io.len, uio)) != 0) return error; hd44780_ddram_redraw(&sc->sc_hlcd, sc->sc_hlcd.sc_curchip, &io); return 0; } int tslcdioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) { struct tslcd_softc *sc = device_lookup_private(&tslcd_cd, minor(dev)); return hd44780_ioctl_subr(&sc->sc_hlcd, cmd, data); } int tslcdpoll(dev_t dev, int events, struct lwp *l) { return 0; }