1 /*
2 * Copyright (C) 2005-2009 Anders Gavare. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are met:
6 *
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. The name of the author may not be used to endorse or promote products
13 * derived from this software without specific prior written permission.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 *
28 * COMMENT: LPT (parallel printer) controller
29 */
30
31 #include <stdio.h>
32 #include <stdlib.h>
33 #include <string.h>
34
35 #include "console.h"
36 #include "cpu.h"
37 #include "device.h"
38 #include "interrupt.h"
39 #include "machine.h"
40 #include "memory.h"
41 #include "misc.h"
42
43 #include "thirdparty/lptreg.h"
44
45
46 /* #define debug fatal */
47
48 #define TICK_SHIFT 18
49 #define DEV_LPT_LENGTH 3
50
51 struct lpt_data {
52 const char *name;
53 struct interrupt irq;
54 int console_handle;
55
56 uint8_t data;
57 uint8_t control;
58 };
59
60
DEVICE_TICK(lpt)61 DEVICE_TICK(lpt)
62 {
63 /* struct lpt_data *d = extra; */
64
65 /* TODO */
66 }
67
68
DEVICE_ACCESS(lpt)69 DEVICE_ACCESS(lpt)
70 {
71 uint64_t idata = 0, odata=0;
72 struct lpt_data *d = (struct lpt_data *) extra;
73
74 if (writeflag == MEM_WRITE)
75 idata = memory_readmax64(cpu, data, len);
76
77 switch (relative_addr) {
78
79 case LPT_DATA:
80 if (writeflag == MEM_READ)
81 odata = d->data;
82 else
83 d->data = idata;
84 break;
85
86 case LPT_STATUS:
87 odata = LPS_NBSY | LPS_NACK | LPS_SELECT | LPS_NERR;
88 break;
89
90 case LPT_CONTROL:
91 if (writeflag == MEM_WRITE) {
92 if (idata != d->control) {
93 if (idata & LPC_STROBE) {
94 /* data strobe */
95 console_putchar(d->console_handle,
96 d->data);
97 }
98 }
99 d->control = idata;
100 }
101 break;
102 }
103
104 if (writeflag == MEM_READ)
105 memory_writemax64(cpu, data, len, odata);
106
107 return 1;
108 }
109
110
DEVINIT(lpt)111 DEVINIT(lpt)
112 {
113 struct lpt_data *d;
114 size_t nlen;
115 char *name;
116
117 CHECK_ALLOCATION(d = (struct lpt_data *) malloc(sizeof(struct lpt_data)));
118 memset(d, 0, sizeof(struct lpt_data));
119
120 INTERRUPT_CONNECT(devinit->interrupt_path, d->irq);
121
122 d->name = devinit->name2 != NULL? devinit->name2 : "";
123 d->console_handle = console_start_slave(devinit->machine, devinit->name,
124 CONSOLE_OUTPUT_ONLY);
125
126 nlen = strlen(devinit->name) + 10;
127 if (devinit->name2 != NULL)
128 nlen += strlen(devinit->name2);
129 CHECK_ALLOCATION(name = (char *) malloc(nlen));
130 if (devinit->name2 != NULL && devinit->name2[0])
131 snprintf(name, nlen, "%s [%s]", devinit->name, devinit->name2);
132 else
133 snprintf(name, nlen, "%s", devinit->name);
134
135 memory_device_register(devinit->machine->memory, name, devinit->addr,
136 DEV_LPT_LENGTH, dev_lpt_access, d, DM_DEFAULT, NULL);
137 machine_add_tickfunction(devinit->machine, dev_lpt_tick, d,
138 TICK_SHIFT);
139
140 /*
141 * NOTE: Ugly cast into a pointer, because this is a convenient way
142 * to return the console handle to code in src/machine.c.
143 */
144 devinit->return_ptr = (void *)(size_t)d->console_handle;
145
146 return 1;
147 }
148
149