1 /* $NetBSD: lcd.c,v 1.6 2009/03/18 10:22:31 cegger 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 1.6 2009/03/18 10:22:31 cegger 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(void) 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(void) 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