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

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Revision 10 - (show annotations)
Mon Oct 8 16:18:27 2007 UTC (16 years, 5 months ago) by dpavlin
File MIME type: text/plain
File size: 8956 byte(s)
++ trunk/HISTORY	(local)
$Id: HISTORY,v 1.815 2005/06/27 23:04:35 debug Exp $
20050617	Experimenting some more with netbooting OpenBSD/sgi. Adding
		a hack which allows emulated ethernet networks to be
		distributed across multiple emulator processes.
20050618	Minor updates (documentation, dummy YAMON emulation, etc).
20050620	strcpy/strcat -> strlcpy/strlcat updates.
		Some more progress on evbmips (Malta).
20050621	Adding a section to doc/configfiles.html about ethernet
		emulation across multiple hosts.
		Beginning the work on the ARM translation engine (using the
		dynamic-but-not-binary translation method).
		Fixing a bintrans bug: 0x9fc00000 should always be treated as
		PROM area, just as 0xbfc00000 is.
		Minor progress on Malta emulation (the PCI-ISA bus).
20050622	NetBSD/evbmips can now be installed (using another emulated
		machine) and run (including userland and so on). :-)
		Spliting up the bintrans haddr_entry field into two (one for
		read, one for write). Probably not much of a speed increase,
		though.
		Updating some NetBSD 2.0 -> 2.0.2 in the documentation.
20050623	Minor updates (documentation, the TODO file, etc).
		gzipped kernels are now always automagically gunzipped when
		loaded.
20050624	Adding a dummy Playstation Portable (PSP) mode, just barely
		enough to run Hello World (in weird colors :-).
		Removing the -b command line option; old bintrans is enabled
		by default instead. It makes more sense.
		Trying to finally fix the non-working performance measurement
		thing (instr/second etc).
20050625	Continuing on the essential basics for ARM emulation. Two
		instructions seem to work, a branch and a simple "mov". (The
		mov arguments are not correct yet.) Performance is definitely
		reasonable.
		Various other minor updates.
		Adding the ARM "bl" instruction.
		Adding support for combining multiple ARM instructions into one
		function call. ("mov" + "mov" is the only one implemented so
		far, but it seems to work.)
		Cleaning up some IP32 interrupt things (crime/mace); disabling
		the PS/2 keyboard controller on IP32, so that NetBSD/sgimips
		boots into userland again.
20050626	Finally! NetBSD/sgimips netboots. Adding instructions to
		doc/guestoses.html on how to set up an nfs server etc.
		Various other minor fixes.
		Playstation Portable ".pbp" files can now be used directly.
		(The ELF part of the .pbp is extracted transparently.)
		Converting some sprintf -> snprintf.
		Adding some more instructions to the ARM disassembler.
20050627	More ARM updates. Adding some simple ldr(b), str(b),
		cmps, and conditional branch instructions, enough to run
		a simple Hello World program.
		All ARM instructions are now inlined/generated for all possible
		condition codes.
		Adding add and sub, and more load/store instructions.
		Removing dummy files: cpu_alpha.c, cpu_hppa.c, and cpu_sparc.c.
		Some minor documentation updates; preparing for a 0.3.4
		release. Updating some URLs.

==============  RELEASE 0.3.4  ==============


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

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