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lcd.c revision 1.5 
      1 /* $NetBSD: lcd.c,v 1.5 2009/03/14 15:36:08 dsl 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  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>		/* RCS ID & Copyright macro defns */
     33 
     34 __KERNEL_RCSID(0, "$NetBSD: lcd.c,v 1.5 2009/03/14 15:36:08 dsl Exp $");
     35 
     36 /*
     37  * XXX
     38  * Following code segments are subject to change.
     39  * XXX
     40  */
     41 
     42 #include <sys/param.h>
     43 #include <sys/systm.h>
     44 #include <sys/device.h>
     45 
     46 #define PIO1_MODE_OUTPUT	0x84
     47 #define PIO1_MODE_INPUT		0x94
     48 
     49 #define POWER	0x10
     50 
     51 #define ENABLE	0x80
     52 #define DISABLE	0x00
     53 
     54 #define WRITE_CMD	(0x00 | 0x00)
     55 #define WRITE_DATA	(0x00 | 0x40)
     56 #define READ_BUSY	(0x20 | 0x00)
     57 #define READ_DATA	(0x20 | 0x40)
     58 
     59 #define LCD_INIT	0x38
     60 #define LCD_ENTRY	0x06
     61 #define LCD_ON		0x0c
     62 #define LCD_CLS		0x01
     63 #define LCD_HOME	0x02
     64 #define LCD_LOCATE(X, Y)	(((Y) & 1 ? 0xc0 : 0x80) | ((X) & 0x0f))
     65 
     66 struct pio {
     67 	volatile u_int8_t portA;
     68 	volatile u_int8_t portB;
     69 	volatile u_int8_t portC;
     70 	volatile u_int8_t cntrl;
     71 };
     72 
     73 void lcdbusywait(void);
     74 void lcdput(int);
     75 void lcdctrl(int);
     76 void lcdshow(char *);
     77 void greeting(void);
     78 			       /* "1234567890123456" */
     79 static char lcd_boot_message1[] = " NetBSD/luna68k ";
     80 static char lcd_boot_message2[] = "   SX-9100/DT   ";
     81 
     82 void
     83 lcdbusywait()
     84 {
     85 	struct pio *p1 = (struct pio *)0x4D000000;
     86 	int msb, s;
     87 
     88 	s = splhigh();
     89 	p1->cntrl = PIO1_MODE_INPUT;
     90 	p1->portC = POWER | READ_BUSY | ENABLE;
     91 	splx(s);
     92 
     93 	do {
     94 		msb = p1->portA & ENABLE;
     95 		delay(5);
     96 	} while (msb != 0);
     97 
     98 	s = splhigh();
     99 	p1->portC = POWER | READ_BUSY | DISABLE;
    100 	splx(s);
    101 }
    102 
    103 void
    104 lcdput(int cc)
    105 {
    106 	struct pio *p1 = (struct pio *)0x4D000000;
    107 	int s;
    108 
    109 	lcdbusywait();
    110 
    111 	s = splhigh();
    112 	p1->cntrl = PIO1_MODE_OUTPUT;
    113 
    114 	p1->portC = POWER | WRITE_DATA | ENABLE;
    115 	p1->portA = cc;
    116 	p1->portC = POWER | WRITE_DATA | DISABLE;
    117 	splx(s);
    118 }
    119 
    120 void
    121 lcdctrl(int cc)
    122 {
    123 	struct pio *p1 = (struct pio *)0x4D000000;
    124 	int s;
    125 
    126 	lcdbusywait();
    127 
    128 	s = splhigh();
    129 	p1->cntrl = PIO1_MODE_OUTPUT;
    130 
    131 	p1->portC = POWER | WRITE_CMD | ENABLE;
    132 	p1->portA = cc;
    133 	p1->portC = POWER | WRITE_CMD | DISABLE;
    134 	splx(s);
    135 }
    136 
    137 void
    138 lcdshow(char *s)
    139 {
    140 	int cc;
    141 
    142 	while ((cc = *s++) != '\0')
    143 		lcdput(cc);
    144 }
    145 
    146 void
    147 greeting()
    148 {
    149 	lcdctrl(LCD_INIT);
    150 	lcdctrl(LCD_ENTRY);
    151 	lcdctrl(LCD_ON);
    152 
    153 	lcdctrl(LCD_CLS);
    154 	lcdctrl(LCD_HOME);
    155 
    156 	lcdctrl(LCD_LOCATE(0, 0));
    157 	lcdshow(lcd_boot_message1);
    158 	lcdctrl(LCD_LOCATE(0, 1));
    159 	lcdshow(lcd_boot_message2);
    160 }
    161