/* $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 <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: tslcd.c,v 1.20 2021/08/07 16:18:50 thorpej Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/poll.h>
#include <sys/conf.h>
#include <sys/uio.h>
#include <sys/types.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/callout.h>
#include <sys/select.h>

#include <sys/bus.h>
#include <machine/autoconf.h>

#include <dev/wscons/wsdisplayvar.h>
#include <dev/wscons/wsconsio.h>
#include <dev/wscons/wscons_callbacks.h>

#include <arm/ep93xx/ep93xxreg.h>
#include <arm/ep93xx/epgpioreg.h>
#include <dev/ic/hd44780reg.h>
#include <dev/ic/hd44780var.h>
#include <evbarm/tsarm/tspldvar.h>
#include <evbarm/tsarm/tsarmreg.h>

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;
}

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