1 |
/* |
2 |
* Copyright (C) 2003-2005 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 |
* $Id: dev_ns16550.c,v 1.33 2005/06/26 11:43:48 debug Exp $ |
29 |
* |
30 |
* NS16550 serial controller. |
31 |
* |
32 |
* TODO: actually implement the fifo :) |
33 |
*/ |
34 |
|
35 |
#include <stdio.h> |
36 |
#include <stdlib.h> |
37 |
#include <string.h> |
38 |
|
39 |
#include "console.h" |
40 |
#include "cpu.h" |
41 |
#include "devices.h" |
42 |
#include "machine.h" |
43 |
#include "memory.h" |
44 |
#include "misc.h" |
45 |
|
46 |
#include "comreg.h" |
47 |
|
48 |
|
49 |
/* #define debug fatal */ |
50 |
|
51 |
#define NS16550_TICK_SHIFT 14 |
52 |
|
53 |
/* #define DISABLE_FIFO */ |
54 |
|
55 |
|
56 |
struct ns_data { |
57 |
int reg[8]; |
58 |
|
59 |
int irqnr; |
60 |
int console_handle; |
61 |
|
62 |
int irq_enable; |
63 |
int addrmult; |
64 |
int in_use; |
65 |
int dlab; /* Divisor Latch Access bit */ |
66 |
int divisor; |
67 |
int databits; |
68 |
char parity; |
69 |
const char *stopbits; |
70 |
}; |
71 |
|
72 |
|
73 |
/* |
74 |
* dev_ns16550_tick(): |
75 |
*/ |
76 |
void dev_ns16550_tick(struct cpu *cpu, void *extra) |
77 |
{ |
78 |
struct ns_data *d = extra; |
79 |
|
80 |
d->reg[com_iir] |= IIR_NOPEND; |
81 |
cpu_interrupt_ack(cpu, d->irqnr); |
82 |
|
83 |
d->reg[com_iir] &= ~IIR_RXRDY; |
84 |
if (d->in_use) { |
85 |
if (console_charavail(d->console_handle)) |
86 |
d->reg[com_iir] |= IIR_RXRDY; |
87 |
} |
88 |
|
89 |
if ((d->irq_enable & IER_ETXRDY && d->reg[com_iir] & IIR_TXRDY) || |
90 |
(d->irq_enable & IER_ERXRDY && d->reg[com_iir] & IIR_RXRDY)) { |
91 |
d->reg[com_iir] &= ~IIR_NOPEND; |
92 |
if (d->reg[com_mcr] & MCR_IENABLE) |
93 |
cpu_interrupt(cpu, d->irqnr); |
94 |
} |
95 |
} |
96 |
|
97 |
|
98 |
/* |
99 |
* dev_ns16550_access(): |
100 |
*/ |
101 |
int dev_ns16550_access(struct cpu *cpu, struct memory *mem, |
102 |
uint64_t relative_addr, unsigned char *data, size_t len, |
103 |
int writeflag, void *extra) |
104 |
{ |
105 |
uint64_t idata = 0, odata=0; |
106 |
int i; |
107 |
struct ns_data *d = extra; |
108 |
|
109 |
idata = memory_readmax64(cpu, data, len); |
110 |
|
111 |
/* Always ready to transmit: */ |
112 |
d->reg[com_lsr] |= LSR_TXRDY | LSR_TSRE; |
113 |
d->reg[com_lsr] &= ~LSR_RXRDY; |
114 |
d->reg[com_msr] = MSR_DCD | MSR_DSR | MSR_CTS; |
115 |
|
116 |
#ifdef DISABLE_FIFO |
117 |
/* FIFO turned off: */ |
118 |
d->reg[com_iir] &= 0x0f; |
119 |
#endif |
120 |
|
121 |
if (d->in_use) { |
122 |
if (console_charavail(d->console_handle)) { |
123 |
d->reg[com_lsr] |= LSR_RXRDY; |
124 |
} |
125 |
} |
126 |
|
127 |
relative_addr /= d->addrmult; |
128 |
|
129 |
switch (relative_addr) { |
130 |
case com_data: /* com_data or com_dlbl */ |
131 |
/* Read/write of the Divisor value: */ |
132 |
if (d->dlab) { |
133 |
if (writeflag == MEM_WRITE) { |
134 |
/* Set the low byte of the divisor: */ |
135 |
d->divisor &= ~0xff; |
136 |
d->divisor |= (idata & 0xff); |
137 |
} else { |
138 |
odata = d->divisor & 0xff; |
139 |
} |
140 |
break; |
141 |
} |
142 |
|
143 |
/* Read write of data: */ |
144 |
if (writeflag == MEM_WRITE) { |
145 |
if (d->reg[com_mcr] & MCR_LOOPBACK) { |
146 |
console_makeavail(d->console_handle, idata); |
147 |
} else { |
148 |
#if 0 |
149 |
/* Ugly hack: don't show form feeds: */ |
150 |
if (idata != 12) |
151 |
#endif |
152 |
console_putchar(d->console_handle, idata); |
153 |
} |
154 |
|
155 |
d->reg[com_iir] |= IIR_TXRDY; |
156 |
dev_ns16550_tick(cpu, d); |
157 |
return 1; |
158 |
} else { |
159 |
if (d->in_use) |
160 |
odata = console_readchar(d->console_handle); |
161 |
else |
162 |
odata = 0; |
163 |
dev_ns16550_tick(cpu, d); |
164 |
} |
165 |
break; |
166 |
case com_ier: /* interrupt enable AND high byte of the divisor */ |
167 |
/* Read/write of the Divisor value: */ |
168 |
if (d->dlab) { |
169 |
if (writeflag == MEM_WRITE) { |
170 |
/* Set the high byte of the divisor: */ |
171 |
d->divisor &= ~0xff00; |
172 |
d->divisor |= ((idata & 0xff) << 8); |
173 |
debug("[ ns16550 speed set to %i bps ]\n", |
174 |
115200 / d->divisor); |
175 |
} else { |
176 |
odata = (d->divisor & 0xff00) >> 8; |
177 |
} |
178 |
break; |
179 |
} |
180 |
|
181 |
/* IER: */ |
182 |
if (writeflag == MEM_WRITE) { |
183 |
/* This is to supress Linux' behaviour */ |
184 |
if (idata != 0) |
185 |
debug("[ ns16550 write to ier: 0x%02x ]\n", |
186 |
idata); |
187 |
|
188 |
/* Needed for NetBSD 2.0, but not 1.6.2? */ |
189 |
if (!(d->irq_enable & IER_ETXRDY) |
190 |
&& (idata & IER_ETXRDY)) |
191 |
d->reg[com_iir] |= IIR_TXRDY; |
192 |
|
193 |
d->irq_enable = idata; |
194 |
dev_ns16550_tick(cpu, d); |
195 |
} else { |
196 |
odata = d->reg[relative_addr]; |
197 |
} |
198 |
break; |
199 |
case com_iir: /* interrupt identification (r), fifo control (w) */ |
200 |
if (writeflag == MEM_WRITE) { |
201 |
debug("[ ns16550 write to fifo control ]\n"); |
202 |
d->reg[relative_addr] = idata; |
203 |
} else { |
204 |
odata = d->reg[relative_addr]; |
205 |
debug("[ ns16550 read from iir: 0x%02x ]\n", odata); |
206 |
dev_ns16550_tick(cpu, d); |
207 |
} |
208 |
break; |
209 |
case com_lsr: |
210 |
if (writeflag == MEM_WRITE) { |
211 |
debug("[ ns16550 write to lsr ]\n"); |
212 |
d->reg[relative_addr] = idata; |
213 |
} else { |
214 |
odata = d->reg[relative_addr]; |
215 |
} |
216 |
break; |
217 |
case com_msr: |
218 |
if (writeflag == MEM_WRITE) { |
219 |
debug("[ ns16550 write to msr ]\n"); |
220 |
d->reg[relative_addr] = idata; |
221 |
} else { |
222 |
odata = d->reg[relative_addr]; |
223 |
} |
224 |
break; |
225 |
case com_lctl: |
226 |
if (writeflag == MEM_WRITE) { |
227 |
d->reg[relative_addr] = idata; |
228 |
switch (idata & 0x7) { |
229 |
case 0: d->databits = 5; d->stopbits = "1"; break; |
230 |
case 1: d->databits = 6; d->stopbits = "1"; break; |
231 |
case 2: d->databits = 7; d->stopbits = "1"; break; |
232 |
case 3: d->databits = 8; d->stopbits = "1"; break; |
233 |
case 4: d->databits = 5; d->stopbits = "1.5"; break; |
234 |
case 5: d->databits = 6; d->stopbits = "2"; break; |
235 |
case 6: d->databits = 7; d->stopbits = "2"; break; |
236 |
case 7: d->databits = 8; d->stopbits = "2"; break; |
237 |
} |
238 |
switch ((idata & 0x38) / 0x8) { |
239 |
case 0: d->parity = 'N'; break; /* none */ |
240 |
case 1: d->parity = 'O'; break; /* odd */ |
241 |
case 2: d->parity = '?'; break; |
242 |
case 3: d->parity = 'E'; break; /* even */ |
243 |
case 4: d->parity = '?'; break; |
244 |
case 5: d->parity = 'Z'; break; /* zero */ |
245 |
case 6: d->parity = '?'; break; |
246 |
case 7: d->parity = 'o'; break; /* one */ |
247 |
} |
248 |
|
249 |
d->dlab = idata & 0x80? 1 : 0; |
250 |
|
251 |
debug("[ ns16550 write to lctl: 0x%02x (%s%s" |
252 |
"setting mode %i%c%s) ]\n", |
253 |
(int)idata, |
254 |
d->dlab? "Divisor Latch access, " : "", |
255 |
idata&0x40? "sending BREAK, " : "", |
256 |
d->databits, d->parity, d->stopbits); |
257 |
} else { |
258 |
odata = d->reg[relative_addr]; |
259 |
debug("[ ns16550 read from lctl: 0x%02x ]\n", odata); |
260 |
} |
261 |
break; |
262 |
case com_mcr: |
263 |
if (writeflag == MEM_WRITE) { |
264 |
d->reg[relative_addr] = idata; |
265 |
debug("[ ns16550 write to mcr: 0x%02x ]\n", idata); |
266 |
} else { |
267 |
odata = d->reg[relative_addr]; |
268 |
debug("[ ns16550 read from mcr: 0x%02x ]\n", odata); |
269 |
} |
270 |
break; |
271 |
default: |
272 |
if (writeflag==MEM_READ) { |
273 |
debug("[ ns16550 read from reg %i ]\n", |
274 |
(int)relative_addr); |
275 |
odata = d->reg[relative_addr]; |
276 |
} else { |
277 |
debug("[ ns16550 write to reg %i:", |
278 |
(int)relative_addr); |
279 |
for (i=0; i<len; i++) |
280 |
debug(" %02x", data[i]); |
281 |
debug(" ]\n"); |
282 |
d->reg[relative_addr] = idata; |
283 |
} |
284 |
} |
285 |
|
286 |
if (writeflag == MEM_READ) |
287 |
memory_writemax64(cpu, data, len, odata); |
288 |
|
289 |
return 1; |
290 |
} |
291 |
|
292 |
|
293 |
/* |
294 |
* dev_ns16550_init(): |
295 |
*/ |
296 |
int dev_ns16550_init(struct machine *machine, struct memory *mem, |
297 |
uint64_t baseaddr, int irq_nr, int addrmult, int in_use, |
298 |
char *name) |
299 |
{ |
300 |
struct ns_data *d; |
301 |
size_t nlen; |
302 |
char *name2; |
303 |
|
304 |
d = malloc(sizeof(struct ns_data)); |
305 |
if (d == NULL) { |
306 |
fprintf(stderr, "out of memory\n"); |
307 |
exit(1); |
308 |
} |
309 |
memset(d, 0, sizeof(struct ns_data)); |
310 |
d->irqnr = irq_nr; |
311 |
d->addrmult = addrmult; |
312 |
d->in_use = in_use; |
313 |
d->dlab = 0; |
314 |
d->divisor = 115200 / 9600; |
315 |
d->databits = 8; |
316 |
d->parity = 'N'; |
317 |
d->stopbits = "1"; |
318 |
d->console_handle = console_start_slave(machine, name); |
319 |
|
320 |
nlen = strlen(name) + 20; |
321 |
name2 = malloc(nlen); |
322 |
if (name2 == NULL) { |
323 |
fprintf(stderr, "out of memory in dev_ns16550_init()\n"); |
324 |
exit(1); |
325 |
} |
326 |
if (name != NULL && name[0]) |
327 |
snprintf(name2, nlen, "ns16550 [%s]", name); |
328 |
else |
329 |
snprintf(name2, nlen, "ns16550"); |
330 |
|
331 |
memory_device_register(mem, name2, baseaddr, |
332 |
DEV_NS16550_LENGTH * addrmult, dev_ns16550_access, d, |
333 |
MEM_DEFAULT, NULL); |
334 |
machine_add_tickfunction(machine, dev_ns16550_tick, |
335 |
d, NS16550_TICK_SHIFT); |
336 |
|
337 |
return d->console_handle; |
338 |
} |
339 |
|