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/* $OpenBSD: lcd.c,v 1.3 2011/01/23 09:39:15 jsing Exp $ */
/*
* Copyright (c) 2007 Mark Kettenis
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/device.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/timeout.h>
#include <machine/autoconf.h>
#include <machine/bus.h>
#include <machine/cpu.h>
#include <machine/pdc.h>
#define LCD_CLS 0x01
#define LCD_HOME 0x02
#define LCD_LOCATE(X, Y) (((Y) & 1 ? 0xc0 : 0x80) | ((X) & 0x0f))
struct lcd_softc {
struct device sc_dv;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_cmdh, sc_datah;
u_int sc_delay;
u_int8_t sc_heartbeat[3];
struct timeout sc_to;
int sc_on;
struct blink_led sc_blink;
};
int lcd_match(struct device *, void *, void *);
void lcd_attach(struct device *, struct device *, void *);
struct cfattach lcd_ca = {
sizeof(struct lcd_softc), lcd_match, lcd_attach
};
struct cfdriver lcd_cd = {
NULL, "lcd", DV_DULL
};
void lcd_mountroot(void *);
void lcd_write(struct lcd_softc *, const char *);
void lcd_blink(void *, int);
void lcd_blink_finish(void *);
int
lcd_match(struct device *parent, void *match, void *aux)
{
struct confargs *ca = aux;
if (strcmp(ca->ca_name, "lcd") == 0)
return (1);
return (0);
}
void
lcd_attach(struct device *parent, struct device *self, void *aux)
{
struct lcd_softc *sc = (struct lcd_softc *)self;
struct confargs *ca = aux;
struct pdc_chassis_lcd *pdc_lcd = (void *)ca->ca_pdc_iodc_read;
int i;
sc->sc_iot = ca->ca_iot;
if (bus_space_map(sc->sc_iot, pdc_lcd->cmd_addr,
1, 0, &sc->sc_cmdh)) {
printf(": cannot map cmd register\n");
return;
}
if (bus_space_map(sc->sc_iot, pdc_lcd->data_addr,
1, 0, &sc->sc_datah)) {
printf(": cannot map data register\n");
bus_space_unmap(sc->sc_iot, sc->sc_cmdh, 1);
return;
}
printf(": model %d\n", pdc_lcd->model);
sc->sc_delay = pdc_lcd->delay;
for (i = 0; i < 3; i++)
sc->sc_heartbeat[i] = pdc_lcd->heartbeat[i];
timeout_set(&sc->sc_to, lcd_blink_finish, sc);
sc->sc_blink.bl_func = lcd_blink;
sc->sc_blink.bl_arg = sc;
blink_led_register(&sc->sc_blink);
mountroothook_establish(lcd_mountroot, sc);
}
void
lcd_mountroot(void *arg)
{
struct lcd_softc *sc = arg;
bus_space_write_1(sc->sc_iot, sc->sc_cmdh, 0, LCD_CLS);
delay(100 * sc->sc_delay);
bus_space_write_1(sc->sc_iot, sc->sc_cmdh, 0, LCD_LOCATE(0, 0));
delay(sc->sc_delay);
lcd_write(sc, "OpenBSD/" MACHINE);
}
void
lcd_write(struct lcd_softc *sc, const char *str)
{
while (*str) {
bus_space_write_1(sc->sc_iot, sc->sc_datah, 0, *str++);
delay(sc->sc_delay);
}
}
void
lcd_blink(void *v, int on)
{
struct lcd_softc *sc = v;
sc->sc_on = on;
bus_space_write_1(sc->sc_iot, sc->sc_cmdh, 0, sc->sc_heartbeat[0]);
timeout_add(&sc->sc_to, max(1, (sc->sc_delay * hz) / 1000000));
}
void
lcd_blink_finish(void *v)
{
struct lcd_softc *sc = v;
u_int8_t data;
if (sc->sc_on)
data = sc->sc_heartbeat[1];
else
data = sc->sc_heartbeat[2];
bus_space_write_1(sc->sc_iot, sc->sc_datah, 0, data);
}
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