lcd.c revision 1.1 
1/*	$NetBSD: lcd.c,v 1.1 2014/02/24 07:23:42 skrll Exp $	*/
2/*	OpenBSD: lcd.c,v 1.2 2007/07/20 22:13:45 kettenis Exp 	*/
3
4/*
5 * Copyright (c) 2007 Mark Kettenis
6 *
7 * Permission to use, copy, modify, and distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 */
19
20#include <sys/param.h>
21#include <sys/device.h>
22#include <sys/kernel.h>
23#include <sys/systm.h>
24#include <sys/callout.h>
25
26#include <machine/autoconf.h>
27#include <sys/bus.h>
28#include <machine/cpu.h>
29#include <machine/pdc.h>
30
31#define LCD_CLS		0x01
32#define LCD_HOME	0x02
33#define LCD_LOCATE(X, Y)	(((Y) & 1 ? 0xc0 : 0x80) | ((X) & 0x0f))
34
35struct lcd_softc {
36	device_t		sc_dv;
37
38	bus_space_tag_t		sc_iot;
39	bus_space_handle_t 	sc_cmdh, sc_datah;
40
41	u_int			sc_delay;
42	uint8_t			sc_heartbeat[3];
43
44	struct callout		sc_to;
45	int			sc_on;
46	struct blink_lcd	sc_blink;
47};
48
49int	lcd_match(device_t, cfdata_t, void *);
50void	lcd_attach(device_t, device_t, void *);
51
52CFATTACH_DECL_NEW(lcd, sizeof(struct lcd_softc), lcd_match,
53    lcd_attach, NULL, NULL);
54
55void	lcd_write(struct lcd_softc *, const char *);
56void	lcd_blink(void *, int);
57void	lcd_blink_finish(void *);
58
59int
60lcd_match(device_t parent, cfdata_t match, void *aux)
61{
62	struct confargs *ca = aux;
63
64	if (strcmp(ca->ca_name, "lcd") == 0)
65		return 1;
66
67	return 0;
68}
69
70void
71lcd_attach(device_t parent, device_t self, void *aux)
72{
73	struct lcd_softc *sc = device_private(self);
74	struct confargs *ca = aux;
75	struct pdc_chassis_lcd *pdc_lcd = &ca->ca_pcl;
76	int i;
77
78	sc->sc_dv = self;
79	sc->sc_iot = ca->ca_iot;
80
81	if (bus_space_map(sc->sc_iot, pdc_lcd->cmd_addr, 1, 0, &sc->sc_cmdh)) {
82		aprint_error(": can't map cmd register\n");
83		return;
84	}
85
86	if (bus_space_map(sc->sc_iot, pdc_lcd->data_addr, 1, 0,
87	    &sc->sc_datah)) {
88		aprint_error(": can't map data register\n");
89		bus_space_unmap(sc->sc_iot, sc->sc_cmdh, 1);
90		return;
91	}
92
93	aprint_normal(": model %d\n", pdc_lcd->model);
94
95	sc->sc_delay = pdc_lcd->delay;
96	for (i = 0; i < 3; i++)
97		sc->sc_heartbeat[i] = pdc_lcd->heartbeat[i];
98
99	bus_space_write_1(sc->sc_iot, sc->sc_cmdh, 0, LCD_CLS);
100	delay(100 * sc->sc_delay);
101
102	bus_space_write_1(sc->sc_iot, sc->sc_cmdh, 0, LCD_LOCATE(0, 0));
103	delay(sc->sc_delay);
104	lcd_write(sc, "NetBSD/" MACHINE);
105
106	callout_init(&sc->sc_to, 0);
107	callout_setfunc(&sc->sc_to, lcd_blink_finish, sc);
108
109	sc->sc_blink.bl_func = lcd_blink;
110	sc->sc_blink.bl_arg = sc;
111	blink_lcd_register(&sc->sc_blink);
112}
113
114void
115lcd_write(struct lcd_softc *sc, const char *str)
116{
117	while (*str) {
118		bus_space_write_1(sc->sc_iot, sc->sc_datah, 0, *str++);
119		delay(sc->sc_delay);
120	}
121}
122
123void
124lcd_blink(void *v, int on)
125{
126	struct lcd_softc *sc = v;
127
128	sc->sc_on = on;
129	bus_space_write_1(sc->sc_iot, sc->sc_cmdh, 0, sc->sc_heartbeat[0]);
130	callout_schedule(&sc->sc_to, max(1, (sc->sc_delay * hz) / 1000000));
131}
132
133void
134lcd_blink_finish(void *v)
135{
136	struct lcd_softc *sc = v;
137	uint8_t data;
138
139	if (sc->sc_on)
140		data = sc->sc_heartbeat[1];
141	else
142		data = sc->sc_heartbeat[2];
143
144	bus_space_write_1(sc->sc_iot, sc->sc_datah, 0, data);
145}
146