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

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Revision 10 - (hide annotations)
Mon Oct 8 16:18:27 2007 UTC (16 years, 6 months ago) by dpavlin
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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 dpavlin 4 /*
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 dpavlin 10 * $Id: dev_ns16550.c,v 1.33 2005/06/26 11:43:48 debug Exp $
29 dpavlin 4 *
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 dpavlin 10 size_t nlen;
302 dpavlin 4 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 dpavlin 10 nlen = strlen(name) + 20;
321     name2 = malloc(nlen);
322 dpavlin 4 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 dpavlin 10 snprintf(name2, nlen, "ns16550 [%s]", name);
328 dpavlin 4 else
329 dpavlin 10 snprintf(name2, nlen, "ns16550");
330 dpavlin 4
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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