NetBSD-5.0.2/sys/dev/ic/hd44780_subr.c
/* $NetBSD: hd44780_subr.c,v 1.15 2008/04/10 09:05:53 he Exp $ */
/*
* Copyright (c) 2002 Dennis I. Chernoivanov
* All rights reserved.
*
* 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.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
/*
* Subroutines for Hitachi HD44870 style displays
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: hd44780_subr.c,v 1.15 2008/04/10 09:05:53 he Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/types.h>
#include <sys/ioccom.h>
#include <machine/autoconf.h>
#include <sys/intr.h>
#include <sys/bus.h>
#include <uvm/uvm_extern.h>
#include <dev/wscons/wsdisplayvar.h>
#include <dev/wscons/wsconsio.h>
#include <dev/wscons/wscons_callbacks.h>
#include <dev/ic/hd44780reg.h>
#include <dev/ic/hd44780var.h>
#define COORD_TO_IDX(x, y) ((y) * sc->sc_cols + (x))
#define COORD_TO_DADDR(x, y) ((y) * HD_ROW2_ADDR + (x))
#define IDX_TO_ROW(idx) ((idx) / sc->sc_cols)
#define IDX_TO_COL(idx) ((idx) % sc->sc_cols)
#define IDX_TO_DADDR(idx) (IDX_TO_ROW((idx)) * HD_ROW2_ADDR + \
IDX_TO_COL((idx)))
#define DADDR_TO_ROW(daddr) ((daddr) / HD_ROW2_ADDR)
#define DADDR_TO_COL(daddr) ((daddr) % HD_ROW2_ADDR)
#define DADDR_TO_CHIPDADDR(daddr) ((daddr) % (HD_ROW2_ADDR * 2))
#define DADDR_TO_CHIPNO(daddr) ((daddr) / (HD_ROW2_ADDR * 2))
static void hlcd_cursor(void *, int, int, int);
static int hlcd_mapchar(void *, int, unsigned int *);
static void hlcd_putchar(void *, int, int, u_int, long);
static void hlcd_copycols(void *, int, int, int,int);
static void hlcd_erasecols(void *, int, int, int, long);
static void hlcd_copyrows(void *, int, int, int);
static void hlcd_eraserows(void *, int, int, long);
static int hlcd_allocattr(void *, int, int, int, long *);
static void hlcd_updatechar(struct hd44780_chip *, int, int);
static void hlcd_redraw(void *);
const struct wsdisplay_emulops hlcd_emulops = {
hlcd_cursor,
hlcd_mapchar,
hlcd_putchar,
hlcd_copycols,
hlcd_erasecols,
hlcd_copyrows,
hlcd_eraserows,
hlcd_allocattr
};
static int hlcd_ioctl(void *, void *, u_long, void *, int, struct lwp *);
static paddr_t hlcd_mmap(void *, void *, off_t, int);
static int hlcd_alloc_screen(void *, const struct wsscreen_descr *,
void **, int *, int *, long *);
static void hlcd_free_screen(void *, void *);
static int hlcd_show_screen(void *, void *, int,
void (*) (void *, int, int), void *);
const struct wsdisplay_accessops hlcd_accessops = {
hlcd_ioctl,
hlcd_mmap,
hlcd_alloc_screen,
hlcd_free_screen,
hlcd_show_screen,
0 /* load_font */
};
static void
hlcd_cursor(id, on, row, col)
void *id;
int on, row, col;
{
struct hlcd_screen *hdscr = id;
hdscr->hlcd_curon = on;
hdscr->hlcd_curx = col;
hdscr->hlcd_cury = row;
}
static int
hlcd_mapchar(id, uni, index)
void *id;
int uni;
unsigned int *index;
{
if (uni < 256) {
*index = uni;
return (5);
}
*index = ' ';
return (0);
}
static void
hlcd_putchar(id, row, col, c, attr)
void *id;
int row, col;
u_int c;
long attr;
{
struct hlcd_screen *hdscr = id;
c &= 0xff;
if (row > 0 && (hdscr->hlcd_sc->sc_flags & (HD_MULTILINE|HD_MULTICHIP)))
hdscr->image[hdscr->hlcd_sc->sc_cols * row + col] = c;
else
hdscr->image[col] = c;
}
/*
* copies columns inside a row.
*/
static void
hlcd_copycols(id, row, srccol, dstcol, ncols)
void *id;
int row, srccol, dstcol, ncols;
{
struct hlcd_screen *hdscr = id;
if ((dstcol + ncols - 1) > hdscr->hlcd_sc->sc_cols)
ncols = hdscr->hlcd_sc->sc_cols - srccol;
if (row > 0 && (hdscr->hlcd_sc->sc_flags & (HD_MULTILINE|HD_MULTICHIP)))
memmove(&hdscr->image[hdscr->hlcd_sc->sc_cols * row + dstcol],
&hdscr->image[hdscr->hlcd_sc->sc_cols * row + srccol],
ncols);
else
memmove(&hdscr->image[dstcol], &hdscr->image[srccol], ncols);
}
/*
* Erases a bunch of chars inside one row.
*/
static void
hlcd_erasecols(id, row, startcol, ncols, fillattr)
void *id;
int row, startcol, ncols;
long fillattr;
{
struct hlcd_screen *hdscr = id;
if ((startcol + ncols) > hdscr->hlcd_sc->sc_cols)
ncols = hdscr->hlcd_sc->sc_cols - startcol;
if (row > 0 && (hdscr->hlcd_sc->sc_flags & (HD_MULTILINE|HD_MULTICHIP)))
memset(&hdscr->image[hdscr->hlcd_sc->sc_cols * row + startcol],
' ', ncols);
else
memset(&hdscr->image[startcol], ' ', ncols);
}
static void
hlcd_copyrows(id, srcrow, dstrow, nrows)
void *id;
int srcrow, dstrow, nrows;
{
struct hlcd_screen *hdscr = id;
int ncols = hdscr->hlcd_sc->sc_cols;
if (!(hdscr->hlcd_sc->sc_flags & (HD_MULTILINE|HD_MULTICHIP)))
return;
memmove(&hdscr->image[dstrow * ncols], &hdscr->image[srcrow * ncols],
nrows * ncols);
}
static void
hlcd_eraserows(id, startrow, nrows, fillattr)
void *id;
int startrow, nrows;
long fillattr;
{
struct hlcd_screen *hdscr = id;
int ncols = hdscr->hlcd_sc->sc_cols;
memset(&hdscr->image[startrow * ncols], ' ', ncols * nrows);
}
static int
hlcd_allocattr(id, fg, bg, flags, attrp)
void *id;
int fg, bg, flags;
long *attrp;
{
*attrp = flags;
return 0;
}
static int
hlcd_ioctl(v, vs, cmd, data, flag, l)
void *v;
void *vs;
u_long cmd;
void *data;
int flag;
struct lwp *l;
{
switch (cmd) {
case WSDISPLAYIO_GTYPE:
*(u_int *)data = WSDISPLAY_TYPE_HDLCD;
break;
case WSDISPLAYIO_SVIDEO:
break;
case WSDISPLAYIO_GVIDEO:
*(u_int *)data = WSDISPLAYIO_VIDEO_ON;
break;
default:
return EPASSTHROUGH;
}
return 0;
}
static paddr_t
hlcd_mmap(v, vs, offset, prot)
void *v;
void *vs;
off_t offset;
int prot;
{
return -1;
}
static int
hlcd_alloc_screen(v, type, cookiep, curxp, curyp, defattrp)
void *v;
const struct wsscreen_descr *type;
void **cookiep;
int *curxp, *curyp;
long *defattrp;
{
struct hlcd_screen *hdscr = v, *new;
new = *cookiep = malloc(sizeof(struct hlcd_screen), M_DEVBUF, M_WAITOK);
bzero(*cookiep, sizeof(struct hlcd_screen));
new->hlcd_sc = hdscr->hlcd_sc;
new->image = malloc(PAGE_SIZE, M_DEVBUF, M_WAITOK);
memset(new->image, ' ', PAGE_SIZE);
*curxp = *curyp = *defattrp = 0;
return 0;
}
static void
hlcd_free_screen(v, cookie)
void *v, *cookie;
{
}
static int
hlcd_show_screen(v, cookie, waitok, cb, cbarg)
void *v, *cookie, *cbarg;
int waitok;
void (*cb)(void *, int, int);
{
struct hlcd_screen *hdscr = v;
hdscr->hlcd_sc->sc_curscr = cookie;
callout_schedule(&hdscr->hlcd_sc->redraw, 1);
return (0);
}
static void
hlcd_updatechar(sc, daddr, c)
struct hd44780_chip *sc;
int daddr, c;
{
int curdaddr, en, chipdaddr;
curdaddr = COORD_TO_DADDR(sc->sc_screen.hlcd_curx,
sc->sc_screen.hlcd_cury);
en = DADDR_TO_CHIPNO(daddr);
chipdaddr = DADDR_TO_CHIPDADDR(daddr);
if (daddr != curdaddr)
hd44780_ir_write(sc, en, cmd_ddramset(chipdaddr));
hd44780_dr_write(sc, en, c);
daddr++;
sc->sc_screen.hlcd_curx = DADDR_TO_COL(daddr);
sc->sc_screen.hlcd_cury = DADDR_TO_ROW(daddr);
}
static void
hlcd_redraw(arg)
void *arg;
{
struct hd44780_chip *sc = arg;
int len, crsridx, startidx, x, y;
int old_en, new_en;
u_char *img, *curimg;
if (sc->sc_curscr == NULL)
return;
if (sc->sc_flags & HD_MULTILINE)
len = 2 * sc->sc_cols;
else
len = sc->sc_cols;
if (sc->sc_flags & HD_MULTICHIP)
len = len * 2;
x = sc->sc_screen.hlcd_curx;
y = sc->sc_screen.hlcd_cury;
old_en = DADDR_TO_CHIPNO(COORD_TO_DADDR(x, y));
img = sc->sc_screen.image;
curimg = sc->sc_curscr->image;
startidx = crsridx =
COORD_TO_IDX(sc->sc_screen.hlcd_curx, sc->sc_screen.hlcd_cury);
do {
if (img[crsridx] != curimg[crsridx]) {
hlcd_updatechar(sc, IDX_TO_DADDR(crsridx),
curimg[crsridx]);
img[crsridx] = curimg[crsridx];
}
crsridx++;
if (crsridx == len)
crsridx = 0;
} while (crsridx != startidx);
x = sc->sc_curscr->hlcd_curx;
y = sc->sc_curscr->hlcd_cury;
new_en = DADDR_TO_CHIPNO(COORD_TO_DADDR(x, y));
if (sc->sc_screen.hlcd_curx != sc->sc_curscr->hlcd_curx ||
sc->sc_screen.hlcd_cury != sc->sc_curscr->hlcd_cury) {
x = sc->sc_screen.hlcd_curx = sc->sc_curscr->hlcd_curx;
y = sc->sc_screen.hlcd_cury = sc->sc_curscr->hlcd_cury;
hd44780_ir_write(sc, new_en, cmd_ddramset(
DADDR_TO_CHIPDADDR(COORD_TO_DADDR(x, y))));
}
/* visible cursor switched to other chip */
if (old_en != new_en && sc->sc_screen.hlcd_curon) {
hd44780_ir_write(sc, old_en, cmd_dispctl(1, 0, 0));
hd44780_ir_write(sc, new_en, cmd_dispctl(1, 1, 1));
}
if (sc->sc_screen.hlcd_curon != sc->sc_curscr->hlcd_curon) {
sc->sc_screen.hlcd_curon = sc->sc_curscr->hlcd_curon;
if (sc->sc_screen.hlcd_curon)
hd44780_ir_write(sc, new_en, cmd_dispctl(1, 1, 1));
else
hd44780_ir_write(sc, new_en, cmd_dispctl(1, 0, 0));
}
callout_schedule(&sc->redraw, 1);
}
/*
* Finish device attach. sc_writereg, sc_readreg and sc_flags must be properly
* initialized prior to this call.
*/
void
hd44780_attach_subr(sc)
struct hd44780_chip *sc;
{
int err = 0;
/* Putc/getc are supposed to be set by platform-dependent code. */
if ((sc->sc_writereg == NULL) || (sc->sc_readreg == NULL))
sc->sc_dev_ok = 0;
/* Make sure that HD_MAX_CHARS is enough. */
if ((sc->sc_flags & HD_MULTILINE) && (2 * sc->sc_cols > HD_MAX_CHARS))
sc->sc_dev_ok = 0;
else if (sc->sc_cols > HD_MAX_CHARS)
sc->sc_dev_ok = 0;
if (sc->sc_dev_ok) {
if ((sc->sc_flags & HD_UP) == 0)
err = hd44780_init(sc);
if (err != 0)
aprint_error_dev(sc->sc_dev, "LCD not responding or unconnected\n");
}
sc->sc_screen.hlcd_sc = sc;
sc->sc_screen.image = malloc(PAGE_SIZE, M_DEVBUF, M_WAITOK);
memset(sc->sc_screen.image, ' ', PAGE_SIZE);
sc->sc_curscr = NULL;
sc->sc_curchip = 0;
callout_init(&sc->redraw, 0);
callout_setfunc(&sc->redraw, hlcd_redraw, sc);
}
int hd44780_init(sc)
struct hd44780_chip *sc;
{
int ret;
ret = hd44780_chipinit(sc, 0);
if (ret != 0 || !(sc->sc_flags & HD_MULTICHIP)) return ret;
else return hd44780_chipinit(sc, 1);
}
/*
* Initialize 4-bit or 8-bit connected device.
*/
int
hd44780_chipinit(sc, en)
struct hd44780_chip *sc;
u_int32_t en;
{
u_int8_t cmd, dat;
sc->sc_flags &= ~(HD_TIMEDOUT|HD_UP);
sc->sc_dev_ok = 1;
cmd = cmd_init(sc->sc_flags & HD_8BIT);
hd44780_ir_write(sc, en, cmd);
delay(HD_TIMEOUT_LONG);
hd44780_ir_write(sc, en, cmd);
hd44780_ir_write(sc, en, cmd);
cmd = cmd_funcset(
sc->sc_flags & HD_8BIT,
sc->sc_flags & HD_MULTILINE,
sc->sc_flags & HD_BIGFONT);
if ((sc->sc_flags & HD_8BIT) == 0)
hd44780_ir_write(sc, en, cmd);
sc->sc_flags |= HD_UP;
hd44780_ir_write(sc, en, cmd);
hd44780_ir_write(sc, en, cmd_dispctl(0, 0, 0));
hd44780_ir_write(sc, en, cmd_clear());
hd44780_ir_write(sc, en, cmd_modset(1, 0));
if (sc->sc_flags & HD_TIMEDOUT) {
sc->sc_flags &= ~HD_UP;
return EIO;
}
/* Turn display on and clear it. */
hd44780_ir_write(sc, en, cmd_clear());
hd44780_ir_write(sc, en, cmd_dispctl(1, 0, 0));
/* Attempt a simple probe for presence */
hd44780_ir_write(sc, en, cmd_ddramset(0x5));
hd44780_ir_write(sc, en, cmd_shift(0, 1));
hd44780_busy_wait(sc, en);
if ((dat = hd44780_ir_read(sc, en) & 0x7f) != 0x6) {
sc->sc_dev_ok = 0;
sc->sc_flags &= ~HD_UP;
return EIO;
}
hd44780_ir_write(sc, en, cmd_ddramset(0));
return 0;
}
/*
* Standard hd44780 ioctl() functions.
*/
int
hd44780_ioctl_subr(sc, cmd, data)
struct hd44780_chip *sc;
u_long cmd;
void *data;
{
u_int8_t tmp;
int error = 0;
u_int32_t en = sc->sc_curchip;
#define hd44780_io() ((struct hd44780_io *)data)
#define hd44780_info() ((struct hd44780_info*)data)
#define hd44780_ctrl() ((struct hd44780_dispctl*)data)
switch (cmd) {
/* Clear the LCD. */
case HLCD_CLEAR:
hd44780_ir_write(sc, en, cmd_clear());
break;
/* Move the cursor one position to the left. */
case HLCD_CURSOR_LEFT:
hd44780_ir_write(sc, en, cmd_shift(0, 0));
break;
/* Move the cursor one position to the right. */
case HLCD_CURSOR_RIGHT:
hd44780_ir_write(sc, en, cmd_shift(0, 1));
break;
/* Control the LCD. */
case HLCD_DISPCTL:
hd44780_ir_write(sc, en, cmd_dispctl(
hd44780_ctrl()->display_on,
hd44780_ctrl()->cursor_on,
hd44780_ctrl()->blink_on));
break;
/* Get LCD configuration. */
case HLCD_GET_INFO:
hd44780_info()->lines
= (sc->sc_flags & HD_MULTILINE) ? 2 : 1;
if (sc->sc_flags & HD_MULTICHIP)
hd44780_info()->lines *= 2;
hd44780_info()->phys_rows = sc->sc_cols;
hd44780_info()->virt_rows = sc->sc_vcols;
hd44780_info()->is_wide = sc->sc_flags & HD_8BIT;
hd44780_info()->is_bigfont = sc->sc_flags & HD_BIGFONT;
hd44780_info()->kp_present = sc->sc_flags & HD_KEYPAD;
break;
/* Reset the LCD. */
case HLCD_RESET:
error = hd44780_init(sc);
break;
/* Get the current cursor position. */
case HLCD_GET_CURSOR_POS:
hd44780_io()->dat = (hd44780_ir_read(sc, en) & 0x7f);
break;
/* Set the cursor position. */
case HLCD_SET_CURSOR_POS:
hd44780_ir_write(sc, en, cmd_ddramset(hd44780_io()->dat));
break;
/* Get the value at the current cursor position. */
case HLCD_GETC:
tmp = (hd44780_ir_read(sc, en) & 0x7f);
hd44780_ir_write(sc, en, cmd_ddramset(tmp));
hd44780_io()->dat = hd44780_dr_read(sc, en);
break;
/* Set the character at the cursor position + advance cursor. */
case HLCD_PUTC:
hd44780_dr_write(sc, en, hd44780_io()->dat);
break;
/* Shift display left. */
case HLCD_SHIFT_LEFT:
hd44780_ir_write(sc, en, cmd_shift(1, 0));
break;
/* Shift display right. */
case HLCD_SHIFT_RIGHT:
hd44780_ir_write(sc, en, cmd_shift(1, 1));
break;
/* Return home. */
case HLCD_HOME:
hd44780_ir_write(sc, en, cmd_rethome());
break;
/* Write a string to the LCD virtual area. */
case HLCD_WRITE:
error = hd44780_ddram_io(sc, en, hd44780_io(), HD_DDRAM_WRITE);
break;
/* Read LCD virtual area. */
case HLCD_READ:
error = hd44780_ddram_io(sc, en, hd44780_io(), HD_DDRAM_READ);
break;
/* Write to the LCD visible area. */
case HLCD_REDRAW:
hd44780_ddram_redraw(sc, en, hd44780_io());
break;
/* Write raw instruction. */
case HLCD_WRITE_INST:
hd44780_ir_write(sc, en, hd44780_io()->dat);
break;
/* Write raw data. */
case HLCD_WRITE_DATA:
hd44780_dr_write(sc, en, hd44780_io()->dat);
break;
/* Get current chip 0 or 1 (top or bottom) */
case HLCD_GET_CHIPNO:
*(u_int8_t *)data = sc->sc_curchip;
break;
/* Set current chip 0 or 1 (top or bottom) */
case HLCD_SET_CHIPNO:
sc->sc_curchip = *(u_int8_t *)data;
break;
default:
error = EINVAL;
}
if (sc->sc_flags & HD_TIMEDOUT)
error = EIO;
return error;
}
/*
* Read/write particular area of the LCD screen.
*/
int
hd44780_ddram_io(sc, en, io, dir)
struct hd44780_chip *sc;
u_int32_t en;
struct hd44780_io *io;
u_char dir;
{
u_int8_t hi;
u_int8_t addr;
int error = 0;
u_int8_t i = 0;
if (io->dat < sc->sc_vcols) {
hi = HD_ROW1_ADDR + sc->sc_vcols;
addr = HD_ROW1_ADDR + io->dat;
for (; (addr < hi) && (i < io->len); addr++, i++) {
hd44780_ir_write(sc, en, cmd_ddramset(addr));
if (dir == HD_DDRAM_READ)
io->buf[i] = hd44780_dr_read(sc, en);
else
hd44780_dr_write(sc, en, io->buf[i]);
}
}
if (io->dat < 2 * sc->sc_vcols) {
hi = HD_ROW2_ADDR + sc->sc_vcols;
if (io->dat >= sc->sc_vcols)
addr = HD_ROW2_ADDR + io->dat - sc->sc_vcols;
else
addr = HD_ROW2_ADDR;
for (; (addr < hi) && (i < io->len); addr++, i++) {
hd44780_ir_write(sc, en, cmd_ddramset(addr));
if (dir == HD_DDRAM_READ)
io->buf[i] = hd44780_dr_read(sc, en);
else
hd44780_dr_write(sc, en, io->buf[i]);
}
if (i < io->len)
io->len = i;
} else {
error = EINVAL;
}
return error;
}
/*
* Write to the visible area of the display.
*/
void
hd44780_ddram_redraw(sc, en, io)
struct hd44780_chip *sc;
u_int32_t en;
struct hd44780_io *io;
{
u_int8_t i;
hd44780_ir_write(sc, en, cmd_clear());
hd44780_ir_write(sc, en, cmd_rethome());
hd44780_ir_write(sc, en, cmd_ddramset(HD_ROW1_ADDR));
for (i = 0; (i < io->len) && (i < sc->sc_cols); i++) {
hd44780_dr_write(sc, en, io->buf[i]);
}
hd44780_ir_write(sc, en, cmd_ddramset(HD_ROW2_ADDR));
for (; (i < io->len); i++)
hd44780_dr_write(sc, en, io->buf[i]);
}
void
hd44780_busy_wait(sc, en)
struct hd44780_chip *sc;
u_int32_t en;
{
int nloops = 100;
if (sc->sc_flags & HD_TIMEDOUT)
return;
while(nloops-- && (hd44780_ir_read(sc, en) & BUSY_FLAG) == BUSY_FLAG);
if (nloops == 0) {
sc->sc_flags |= HD_TIMEDOUT;
sc->sc_dev_ok = 0;
}
}
#if defined(HD44780_STD_WIDE)
/*
* Standard 8-bit version of 'sc_writereg' (8-bit port, 8-bit access)
*/
void
hd44780_writereg(sc, en, reg, cmd)
struct hd44780_chip *sc;
u_int32_t en, reg;
u_int8_t cmd;
{
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh;
if (sc->sc_dev_ok == 0)
return;
if (reg == 0)
ioh = sc->sc_ioir;
else
ioh = sc->sc_iodr;
bus_space_write_1(iot, ioh, 0x00, cmd);
delay(HD_TIMEOUT_NORMAL);
}
/*
* Standard 8-bit version of 'sc_readreg' (8-bit port, 8-bit access)
*/
u_int8_t
hd44780_readreg(sc, en, reg)
struct hd44780_chip *sc;
u_int32_t en, reg;
{
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh;
if (sc->sc_dev_ok == 0)
return;
if (reg == 0)
ioh = sc->sc_ioir;
else
ioh = sc->sc_iodr;
delay(HD_TIMEOUT_NORMAL);
return bus_space_read_1(iot, ioh, 0x00);
}
#elif defined(HD44780_STD_SHORT)
/*
* Standard 4-bit version of 'sc_writereg' (4-bit port, 8-bit access)
*/
void
hd44780_writereg(sc, en, reg, cmd)
struct hd44780_chip *sc;
u_int32_t en, reg;
u_int8_t cmd;
{
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh;
if (sc->sc_dev_ok == 0)
return;
if (reg == 0)
ioh = sc->sc_ioir;
else
ioh = sc->sc_iodr;
bus_space_write_1(iot, ioh, 0x00, hi_bits(cmd));
if (sc->sc_flags & HD_UP)
bus_space_write_1(iot, ioh, 0x00, lo_bits(cmd));
delay(HD_TIMEOUT_NORMAL);
}
/*
* Standard 4-bit version of 'sc_readreg' (4-bit port, 8-bit access)
*/
u_int8_t
hd44780_readreg(sc, en, reg)
struct hd44780_chip *sc;
u_int32_t en, reg;
{
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh;
u_int8_t rd, dat;
if (sc->sc_dev_ok == 0)
return;
if (reg == 0)
ioh = sc->sc_ioir;
else
ioh = sc->sc_iodr;
rd = bus_space_read_1(iot, ioh, 0x00);
dat = (rd & 0x0f) << 4;
rd = bus_space_read_1(iot, ioh, 0x00);
return (dat | (rd & 0x0f));
}
#endif