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lcd.c revision 1.2 
      1 /* $NetBSD: lcd.c,v 1.2 2000/01/07 05:13:08 nisimura Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2000 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Tohru Nishimura.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the NetBSD
     21  *	Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #include <sys/cdefs.h>		/* RCS ID & Copyright macro defns */
     40 
     41 __KERNEL_RCSID(0, "$NetBSD: lcd.c,v 1.2 2000/01/07 05:13:08 nisimura Exp $");
     42 
     43 /*
     44  * XXX
     45  * Following code segments are subject to change.
     46  * XXX
     47  */
     48 
     49 #include <sys/param.h>
     50 #include <sys/systm.h>
     51 #include <sys/device.h>
     52 
     53 #define PIO1_MODE_OUTPUT	0x84
     54 #define PIO1_MODE_INPUT		0x94
     55 
     56 #define POWER	0x10
     57 
     58 #define ENABLE	0x80
     59 #define DISABLE	0x00
     60 
     61 #define WRITE_CMD	(0x00 | 0x00)
     62 #define WRITE_DATA	(0x00 | 0x40)
     63 #define READ_BUSY	(0x20 | 0x00)
     64 #define READ_DATA	(0x20 | 0x40)
     65 
     66 #define LCD_INIT	0x38
     67 #define LCD_ENTRY	0x06
     68 #define LCD_ON		0x0c
     69 #define LCD_CLS		0x01
     70 #define LCD_HOME	0x02
     71 #define LCD_LOCATE(X, Y)	(((Y) & 1 ? 0xc0 : 0x80) | ((X) & 0x0f))
     72 
     73 struct pio {
     74 	volatile u_int8_t portA;
     75 	volatile u_int8_t portB;
     76 	volatile u_int8_t portC;
     77 	volatile u_int8_t cntrl;
     78 };
     79 
     80 void lcdbusywait __P((void));
     81 void lcdput __P((int));
     82 void lcdctrl __P((int));
     83 void lcdshow __P((char *));
     84 void greeting __P((void));
     85 			       /* "1234567890123456" */
     86 static char lcd_boot_message1[] = " NetBSD/luna68k ";
     87 static char lcd_boot_message2[] = "   SX-9100/DT   ";
     88 
     89 void
     90 lcdbusywait()
     91 {
     92 	struct pio *p1 = (struct pio *)0x4D000000;
     93 	int msb, s;
     94 
     95 	s = splhigh();
     96 	p1->cntrl = PIO1_MODE_INPUT;
     97 	p1->portC = POWER | READ_BUSY | ENABLE;
     98 	splx(s);
     99 
    100 	do {
    101 		msb = p1->portA & ENABLE;
    102 		delay(5);
    103 	} while (msb != 0);
    104 
    105 	s = splhigh();
    106 	p1->portC = POWER | READ_BUSY | DISABLE;
    107 	splx(s);
    108 }
    109 
    110 void
    111 lcdput(cc)
    112 	int cc;
    113 {
    114 	struct pio *p1 = (struct pio *)0x4D000000;
    115 	int s;
    116 
    117 	lcdbusywait();
    118 
    119 	s = splhigh();
    120 	p1->cntrl = PIO1_MODE_OUTPUT;
    121 
    122 	p1->portC = POWER | WRITE_DATA | ENABLE;
    123 	p1->portA = cc;
    124 	p1->portC = POWER | WRITE_DATA | DISABLE;
    125 	splx(s);
    126 }
    127 
    128 void
    129 lcdctrl(cc)
    130 	int cc;
    131 {
    132 	struct pio *p1 = (struct pio *)0x4D000000;
    133 	int s;
    134 
    135 	lcdbusywait();
    136 
    137 	s = splhigh();
    138 	p1->cntrl = PIO1_MODE_OUTPUT;
    139 
    140 	p1->portC = POWER | WRITE_CMD | ENABLE;
    141 	p1->portA = cc;
    142 	p1->portC = POWER | WRITE_CMD | DISABLE;
    143 	splx(s);
    144 }
    145 
    146 void
    147 lcdshow(s)
    148 	char *s;
    149 {
    150 	int cc;
    151 
    152 	while ((cc = *s++) != '\0')
    153 		lcdput(cc);
    154 }
    155 
    156 void
    157 greeting()
    158 {
    159 	lcdctrl(LCD_INIT);
    160 	lcdctrl(LCD_ENTRY);
    161 	lcdctrl(LCD_ON);
    162 
    163 	lcdctrl(LCD_CLS);
    164 	lcdctrl(LCD_HOME);
    165 
    166 	lcdctrl(LCD_LOCATE(0, 0));
    167 	lcdshow(lcd_boot_message1);
    168 	lcdctrl(LCD_LOCATE(0, 1));
    169 	lcdshow(lcd_boot_message2);
    170 }
    171