/[gxemul]/trunk/src/devices/dev_ns16550.c
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Contents of /trunk/src/devices/dev_ns16550.c

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Revision 4 - (show annotations)
Mon Oct 8 16:18:00 2007 UTC (16 years, 6 months ago) by dpavlin
File MIME type: text/plain
File size: 8914 byte(s) 
++ trunk/HISTORY	(local)
$Id: HISTORY,v 1.707 2005/04/27 16:37:33 debug Exp $
20050408	Some minor updates to the wdc. Linux now doesn't complain
		anymore if a disk is non-present.
20050409	Various minor fixes (a bintrans bug, and some other things).
		The wdc seems to work with Playstation2 emulation, but there
		is a _long_ annoying delay when disks are detected.
		Fixing a really important bintrans bug (when devices and RAM
		are mixed within 4KB pages), which was triggered with
		NetBSD/playstation2 kernels.
20050410	Adding a dummy dev_ps2_ether (just so that NetBSD doesn't
		complain as much during bootup).
		Symbols starting with '$' are now ignored.
		Renaming dev_ps2_ohci.c to dev_ohci.c, etc.
20050411	Moving the bintrans-cache-isolation check from cpu_mips.c to
		cpu_mips_coproc.c. (I thought this would give a speedup, but
		it's not noticable.)
		Better playstation2 sbus interrupt code.
		Skip ahead many ticks if the count register is read manually.
		(This increases the speed of delay-loops that simply read
		the count register.)
20050412	Updates to the playstation2 timer/interrupt code.
		Some other minor updates.
20050413	NetBSD/cobalt runs from a disk image :-) including userland;
		updating the documentation on how to install NetBSD/cobalt
		using NetBSD/pmax (!).
		Some minor bintrans updates (no real speed improvement) and
		other minor updates (playstation2 now uses the -o options).
20050414	Adding a dummy x86 (and AMD64) mode.
20050415	Adding some (32-bit and 16-bit) x86 instructions.
		Adding some initial support for non-SCSI, non-IDE floppy
		images. (The x86 mode can boot from these, more or less.)
		Moving the devices/ and include/ directories to src/devices/
		and src/include/, respectively.
20050416	Continuing on the x86 stuff. (Adding pc_bios.c and some simple
		support for software interrupts in 16-bit mode.)
20050417	Ripping out most of the x86 instruction decoding stuff, trying
		to rewrite it in a cleaner way.
		Disabling some of the least working CPU families in the
		configure script (sparc, x86, alpha, hppa), so that they are
		not enabled by default.
20050418	Trying to fix the bug which caused problems when turning on
		and off bintrans interactively, by flushing the bintrans cache
		whenever bintrans is manually (re)enabled.
20050419	Adding the 'lswi' ppc instruction.
		Minor updates to the x86 instruction decoding.
20050420	Renaming x86 register name indices from R_xx to X86_R_xx (this
		makes building on Tru64 nicer).
20050422	Adding a check for duplicate MIPS TLB entries on tlbwr/tlbwi.
20050427	Adding screenshots to guestoses.html.
		Some minor fixes and testing for the next release.

==============  RELEASE 0.3.2  ==============
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 1.32 2005/02/19 11:51:33 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 char *name2;
302
303 d = malloc(sizeof(struct ns_data));
304 if (d == NULL) {
305 fprintf(stderr, "out of memory\n");
306 exit(1);
307 }
308 memset(d, 0, sizeof(struct ns_data));
309 d->irqnr = irq_nr;
310 d->addrmult = addrmult;
311 d->in_use = in_use;
312 d->dlab = 0;
313 d->divisor = 115200 / 9600;
314 d->databits = 8;
315 d->parity = 'N';
316 d->stopbits = "1";
317 d->console_handle = console_start_slave(machine, name);
318
319 name2 = malloc(strlen(name) + 20);
320 if (name2 == NULL) {
321 fprintf(stderr, "out of memory in dev_ns16550_init()\n");
322 exit(1);
323 }
324 if (name != NULL && name[0])
325 sprintf(name2, "ns16550 [%s]", name);
326 else
327 sprintf(name2, "ns16550");
328
329 memory_device_register(mem, name2, baseaddr,
330 DEV_NS16550_LENGTH * addrmult, dev_ns16550_access, d,
331 MEM_DEFAULT, NULL);
332 machine_add_tickfunction(machine, dev_ns16550_tick,
333 d, NS16550_TICK_SHIFT);
334
335 return d->console_handle;
336 }
337
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