1 /* $OpenBSD: bioscons.c,v 1.36 2016/05/27 05:37:51 beck Exp $ */
2
3 /*
4 * Copyright (c) 1997-1999 Michael Shalayeff
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
20 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22 * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
24 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
25 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
26 * THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include <sys/types.h>
30 #include <machine/biosvar.h>
31 #include <machine/pio.h>
32 #include <dev/isa/isareg.h>
33 #include <dev/ic/mc146818reg.h>
34 #include <dev/ic/comreg.h>
35 #include <dev/ic/ns16450reg.h>
36 /* #include <i386/isa/nvram.h> */
37 #include <dev/cons.h>
38 #include <lib/libsa/stand.h>
39 #include "debug.h"
40 #include "biosdev.h"
41
42 /* XXX cannot trust NVRAM on this. Maybe later we make a real probe. */
43 #if 0
44 #define PRESENT_MASK (NVRAM_EQUIPMENT_KBD|NVRAM_EQUIPMENT_DISPLAY)
45 #else
46 #define PRESENT_MASK 0
47 #endif
48
49 void
pc_probe(struct consdev * cn)50 pc_probe(struct consdev *cn)
51 {
52 cn->cn_pri = CN_MIDPRI;
53 cn->cn_dev = makedev(12, 0);
54 printf(" pc%d", minor(cn->cn_dev));
55
56 #if 0
57 outb(IO_RTC, NVRAM_EQUIPMENT);
58 if ((inb(IO_RTC+1) & PRESENT_MASK) == PRESENT_MASK) {
59 cn->cn_pri = CN_MIDPRI;
60 /* XXX from i386/conf.c */
61 cn->cn_dev = makedev(12, 0);
62 printf(" pc%d", minor(cn->cn_dev));
63 }
64 #endif
65 }
66
67 void
pc_init(struct consdev * cn)68 pc_init(struct consdev *cn)
69 {
70 }
71
72 int
pc_getc(dev_t dev)73 pc_getc(dev_t dev)
74 {
75 register int rv;
76
77 if (dev & 0x80) {
78 __asm volatile(DOINT(0x16) "; setnz %b0" : "=a" (rv) :
79 "0" (0x100) : "%ecx", "%edx", "cc" );
80 return (rv & 0xff);
81 }
82
83 /*
84 * Wait for a character to actually become available. Appears to
85 * be necessary on (at least) the Intel Mac Mini.
86 */
87 do {
88 __asm volatile(DOINT(0x16) "; setnz %b0" : "=a" (rv) :
89 "0" (0x100) : "%ecx", "%edx", "cc" );
90 } while ((rv & 0xff) == 0);
91
92 __asm volatile(DOINT(0x16) : "=a" (rv) : "0" (0x000) :
93 "%ecx", "%edx", "cc" );
94
95 return (rv & 0xff);
96 }
97
98 int
pc_getshifts(dev_t dev)99 pc_getshifts(dev_t dev)
100 {
101 register int rv;
102
103 __asm volatile(DOINT(0x16) : "=a" (rv) : "0" (0x200) :
104 "%ecx", "%edx", "cc" );
105
106 return (rv & 0xff);
107 }
108
109 void
pc_putc(dev_t dev,int c)110 pc_putc(dev_t dev, int c)
111 {
112 __asm volatile(DOINT(0x10) : : "a" (c | 0xe00), "b" (1) :
113 "%ecx", "%edx", "cc" );
114 }
115
116 const int comports[4] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8 };
117
118 void
com_probe(struct consdev * cn)119 com_probe(struct consdev *cn)
120 {
121 register int i, n;
122
123 /* get equip. (9-11 # of coms) */
124 __asm volatile(DOINT(0x11) : "=a" (n) : : "%ecx", "%edx", "cc");
125 n >>= 9;
126 n &= 7;
127 for (i = 0; i < n; i++)
128 printf(" com%d", i);
129
130 cn->cn_pri = CN_LOWPRI;
131 /* XXX from i386/conf.c */
132 cn->cn_dev = makedev(8, 0);
133 }
134
135 int com_speed = -1;
136 int com_addr = -1;
137
138 void
com_init(struct consdev * cn)139 com_init(struct consdev *cn)
140 {
141 int port = (com_addr == -1) ? comports[minor(cn->cn_dev)] : com_addr;
142 time_t tt = getsecs() + 1;
143 u_long i = 1;
144
145 outb(port + com_ier, 0);
146 if (com_speed == -1)
147 comspeed(cn->cn_dev, 9600); /* default speed is 9600 baud */
148 outb(port + com_mcr, MCR_DTR | MCR_RTS);
149 outb(port + com_fifo, FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST |
150 FIFO_TRIGGER_1);
151 (void) inb(port + com_iir);
152
153 /* A few ms delay for the chip, using the getsecs() API */
154 while (!(i++ % 1000) && getsecs() < tt)
155 ;
156
157 /* drain the input buffer */
158 while (inb(port + com_lsr) & LSR_RXRDY)
159 (void)inb(port + com_data);
160 }
161
162 int
com_getc(dev_t dev)163 com_getc(dev_t dev)
164 {
165 int port = (com_addr == -1) ? comports[minor(dev & 0x7f)] : com_addr;
166
167 if (dev & 0x80)
168 return (inb(port + com_lsr) & LSR_RXRDY);
169
170 while ((inb(port + com_lsr) & LSR_RXRDY) == 0)
171 ;
172
173 return (inb(port + com_data) & 0xff);
174 }
175
176 /* call with sp == 0 to query the current speed */
177 int
comspeed(dev_t dev,int sp)178 comspeed(dev_t dev, int sp)
179 {
180 int port = (com_addr == -1) ? comports[minor(dev)] : com_addr;
181 int i, newsp;
182 int err;
183
184 if (sp <= 0)
185 return com_speed;
186 /* valid baud rate? */
187 if (115200 < sp || sp < 75)
188 return -1;
189
190 /*
191 * Accepted speeds:
192 * 75 150 300 600 1200 2400 4800 9600 19200 38400 76800 and
193 * 14400 28800 57600 115200
194 */
195 for (i = sp; i != 75 && i != 14400; i >>= 1)
196 if (i & 1)
197 return -1;
198
199 /* ripped screaming from dev/ic/com.c */
200 #define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */
201 newsp = divrnd((COM_FREQ / 16), sp);
202 if (newsp <= 0)
203 return -1;
204 err = divrnd((COM_FREQ / 16) * 1000, sp * newsp) - 1000;
205 if (err < 0)
206 err = -err;
207 if (err > COM_TOLERANCE)
208 return -1;
209 #undef divrnd
210
211 if (com_speed != -1 && cn_tab && cn_tab->cn_dev == dev &&
212 com_speed != sp) {
213 printf("com%d: changing speed to %d baud in 5 seconds, "
214 "change your terminal to match!\n\a",
215 minor(dev), sp);
216 sleep(5);
217 }
218
219 outb(port + com_cfcr, LCR_DLAB);
220 outb(port + com_dlbl, newsp);
221 outb(port + com_dlbh, newsp>>8);
222 outb(port + com_cfcr, LCR_8BITS);
223 if (com_speed != -1)
224 printf("\ncom%d: %d baud\n", minor(dev), sp);
225
226 newsp = com_speed;
227 com_speed = sp;
228 return newsp;
229 }
230
231 void
com_putc(dev_t dev,int c)232 com_putc(dev_t dev, int c)
233 {
234 int port = (com_addr == -1) ? comports[minor(dev)] : com_addr;
235
236 while ((inb(port + com_lsr) & LSR_TXRDY) == 0)
237 ;
238
239 outb(port + com_data, c);
240 }
241