/[gxemul]/trunk/src/devices/dev_dreamcast_maple.c
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
ViewVC logotype

Annotation of /trunk/src/devices/dev_dreamcast_maple.c

Parent Directory Parent Directory | Revision Log Revision Log

Revision 34 - (hide annotations)
Mon Oct 8 16:21:17 2007 UTC (16 years, 6 months ago) by dpavlin
File MIME type: text/plain
File size: 18351 byte(s) 
++ trunk/HISTORY	(local)
$Id: HISTORY,v 1.1480 2007/02/19 01:34:42 debug Exp $
20061029	Changing usleep(1) calls in the debugger to usleep(10000)
20061107	Adding a new disk image option (-d o...) which sets the ISO9660
		filesystem base offset; also making some other hacks to allow
		NetBSD/dreamcast and homebrew demos/games to boot directly
		from a filesystem image.
		Moving Dreamcast-specific stuff in the documentation to its
		own page (dreamcast.html).
		Adding a border to the Dreamcast PVR framebuffer.
20061108	Adding a -T command line option (again?), for halting the
		emulator on unimplemented memory accesses.
20061109	Continuing on various SH4 and Dreamcast related things.
		The emulator should now halt on more unimplemented device
		accesses, instead of just printing a warning, forcing me to
		actually implement missing stuff :)
20061111	Continuing on SH4 and Dreamcast stuff.
		Adding a bogus Landisk (SH4) machine mode.
20061112	Implementing some parts of the Dreamcast GDROM device. With
		some ugly hacks, NetBSD can (barely) mount an ISO image.
20061113	NetBSD/dreamcast now starts booting from the Live CD image,
		but crashes randomly quite early on in the boot process.
20061122	Beginning on a skeleton interrupt.h and interrupt.c for the
		new interrupt subsystem.
20061124	Continuing on the new interrupt system; taking the first steps
		to attempt to connect CPUs (SuperH and MIPS) and devices
		(dev_cons and SH4 timer interrupts) to it. Many things will
		probably break from now on.
20061125	Converting dev_ns16550, dev_8253 to the new interrupt system.
		Attempting to begin to convert the ISA bus.
20061130	Incorporating a patch from Brian Foley for the configure
		script, which checks for X11 libs in /usr/X11R6/lib64 (which
		is used on some Linux systems).
20061227	Adding a note in the man page about booting from Dreamcast
		CDROM images (i.e. that no external kernel is needed).
20061229	Continuing on the interrupt system rewrite: beginning to
		convert more devices, adding abort() calls for legacy interrupt
		system calls so that everything now _has_ to be rewritten!
		Almost all machine modes are now completely broken.
20061230	More progress on removing old interrupt code, mostly related
		to the ISA bus + devices, the LCA bus (on AlphaBook1), and
		the Footbridge bus (for CATS). And some minor PCI stuff.
		Connecting the ARM cpu to the new interrupt system.
		The CATS, NetWinder, and QEMU_MIPS machine modes now work with
		the new interrupt system :)
20061231	Connecting PowerPC CPUs to the new interrupt system.
		Making PReP machines (IBM 6050) work again.
		Beginning to convert the GT PCI controller (for e.g. Malta
		and Cobalt emulation). Some things work, but not everything.
		Updating Copyright notices for 2007.
20070101	Converting dev_kn02 from legacy style to devinit; the 3max
		machine mode now works with the new interrupt system :-]
20070105	Beginning to convert the SGI O2 machine to the new interrupt
		system; finally converting O2 (IP32) devices to devinit, etc.
20070106	Continuing on the interrupt system redesign/rewrite; KN01
		(PMAX), KN230, and Dreamcast ASIC interrupts should work again,
		moving out stuff from machine.h and devices.h into the
		corresponding devices, beginning the rewrite of i80321
		interrupts, etc.
20070107	Beginning on the rewrite of Eagle interrupt stuff (PReP, etc).
20070117	Beginning the rewrite of Algor (V3) interrupts (finally
		changing dev_v3 into devinit style).
20070118	Removing the "bus" registry concept from machine.h, because
		it was practically meaningless.
		Continuing on the rewrite of Algor V3 ISA interrupts.
20070121	More work on Algor interrupts; they are now working again,
		well enough to run NetBSD/algor. :-)
20070122	Converting VR41xx (HPCmips) interrupts. NetBSD/hpcmips
		can be installed using the new interrupt system :-)
20070123	Making the testmips mode work with the new interrupt system.
20070127	Beginning to convert DEC5800 devices to devinit, and to the
		new interrupt system.
		Converting Playstation 2 devices to devinit, and converting
		the interrupt system. Also fixing a severe bug: the interrupt
		mask register on Playstation 2 is bitwise _toggled_ on writes.
20070128	Removing the dummy NetGear machine mode and the 8250 device
		(which was only used by the NetGear machine).
		Beginning to convert the MacPPC GC (Grand Central) interrupt
		controller to the new interrupt system.
		Converting Jazz interrupts (PICA61 etc.) to the new interrupt
		system. NetBSD/arc can be installed again :-)
		Fixing the JAZZ timer (hardcoding it at 100 Hz, works with
		NetBSD and it is better than a completely dummy timer as it
		was before).
		Converting dev_mp to the new interrupt system, although I
		haven't had time to actually test it yet.
		Completely removing src/machines/interrupts.c, cpu_interrupt
		and cpu_interrupt_ack in src/cpu.c, and
		src/include/machine_interrupts.h! Adding fatal error messages
		+ abort() in the few places that are left to fix.
		Converting dev_z8530 to the new interrupt system.
		FINALLY removing the md_int struct completely from the
		machine struct.
		SH4 fixes (adding a PADDR invalidation in the ITLB replacement
		code in memory_sh.c); the NetBSD/dreamcast LiveCD now runs
		all the way to the login prompt, and can be interacted with :-)
		Converting the CPC700 controller (PCI and interrupt controller
		for PM/PPC) to the new interrupt system.
20070129	Fixing MACE ISA interrupts (SGI IP32 emulation). Both NetBSD/
		sgimips' and OpenBSD/sgi's ramdisk kernels can now be
		interacted with again.
20070130	Moving out the MIPS multi_lw and _sw instruction combinations
		so that they are auto-generated at compile time instead.
20070131	Adding detection of amd64/x86_64 hosts in the configure script,
		for doing initial experiments (again :-) with native code
		generation.
		Adding a -k command line option to set the size of the dyntrans
		cache, and a -B command line option to disable native code
		generation, even if GXemul was compiled with support for
		native code generation for the specific host CPU architecture.
20070201	Experimenting with a skeleton for native code generation.
		Changing the default behaviour, so that native code generation
		is now disabled by default, and has to be enabled by using
		-b on the command line.
20070202	Continuing the native code generation experiments.
		Making PCI interrupts work for Footbridge again.
20070203	More native code generation experiments.
		Removing most of the native code generation experimental code,
		it does not make sense to include any quick hacks like this.
		Minor cleanup/removal of some more legacy MIPS interrupt code.
20070204	Making i80321 interrupts work again (for NetBSD/evbarm etc.),
		and fixing the timer at 100 Hz.
20070206	Experimenting with removing the wdc interrupt slowness hack.
20070207	Lowering the number of dyntrans TLB entries for MIPS from
		192 to 128, resulting in a minor speed improvement.
		Minor optimization to the code invalidation routine in
		cpu_dyntrans.c.
20070208	Increasing (experimentally) the nr of dyntrans instructions per
		loop from 60 to 120.
20070210	Commenting out (experimentally) the dyntrans_device_danger
		detection in memory_rw.c.
		Changing the testmips and baremips machines to use a revision 2
		MIPS64 CPU by default, instead of revision 1.
		Removing the dummy i960, IA64, x86, AVR32, and HP PA-RISC
		files, the PC bios emulation, and the Olivetti M700 (ARC) and
		db64360 emulation modes.
20070211	Adding an "mp" demo to the demos directory, which tests the
		SMP functionality of the testmips machine.
		Fixing PReP interrupts some more. NetBSD/prep now boots again.
20070216	Adding a "nop workaround" for booting Mach/PMAX to the
		documentation; thanks to Artur Bujdoso for the values.
		Converting more of the MacPPC interrupt stuff to the new
		system.
		Beginning to convert BeBox interrupts to the new system.
		PPC603e should NOT have the PPC_NO_DEC flag! Removing it.
		Correcting BeBox clock speed (it was set to 100 in the NetBSD
		bootinfo block, but should be 33000000/4), allowing NetBSD
		to start without using the (incorrect) PPC_NO_DEC hack.
20070217	Implementing (slow) AltiVec vector loads and stores, allowing
		NetBSD/macppc to finally boot using the GENERIC kernel :-)
		Updating the documentation with install instructions for
		NetBSD/macppc.
20070218-19	Regression testing for the release.

==============  RELEASE 0.4.4  ==============
1 dpavlin 32 /*
2 dpavlin 34 * Copyright (C) 2006-2007 Anders Gavare. All rights reserved.
3 dpavlin 32 *
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 34 * $Id: dev_dreamcast_maple.c,v 1.11 2007/02/03 20:14:23 debug Exp $
29 dpavlin 32 *
30     * Dreamcast "Maple" bus controller.
31     *
32     * The Maple bus has 4 ports (A-D), and each port has up to 6 possible "units"
33     * (where unit 0 is the main unit). Communication is done using DMA; each
34     * DMA transfer sends one or more requests, and for each of these requests
35     * a response is generated (or a timeout if there was no device at the
36     * specific port).
37     *
38     * See Marcus Comstedt's page (http://mc.pp.se/dc/maplebus.html) for more
39     * details about the DMA request/responses.
40     *
41     *
42     * TODO:
43     * Unit numbers / IDs for real Maple devices.
44     */
45    
46     #include <stdio.h>
47     #include <stdlib.h>
48     #include <string.h>
49     #include <sys/time.h>
50    
51     #include "console.h"
52     #include "cpu.h"
53     #include "device.h"
54     #include "machine.h"
55     #include "memory.h"
56     #include "misc.h"
57    
58     #include "dreamcast_maple.h"
59     #include "dreamcast_sysasicvar.h"
60    
61    
62     #define debug fatal
63    
64     #define N_MAPLE_PORTS 4
65    
66     #define MAX_CHARS 8192
67     #define MAX_CONTROLLER_DATA 4096
68    
69     #define MAPLE_TICK_SHIFT 17
70    
71     struct maple_device {
72     struct maple_devinfo devinfo;
73     };
74    
75     struct dreamcast_maple_data {
76     /* Registers: */
77     uint32_t dmaaddr;
78     int enable;
79     int timeout;
80    
81     /* Attached devices: */
82     struct maple_device *device[N_MAPLE_PORTS];
83    
84     /* For keyboard/controller input: */
85     int console_handle;
86     uint8_t char_queue[MAX_CHARS];
87     uint16_t controller_queue[MAX_CONTROLLER_DATA];
88     int char_queue_head, char_queue_tail;
89     int controller_queue_head, controller_queue_tail;
90     };
91    
92    
93     /*
94     * Maple devices:
95     *
96     * TODO: Figure out strings and numbers of _real_ Maple devices.
97     */
98     static struct maple_device maple_device_controller = {
99     {
100     BE32_TO_HOST(MAPLE_FUNC(MAPLE_FN_CONTROLLER)), /* di_func */
101     { 0,0,0 }, /* di_function_data[3] */
102     0, /* di_area_code */
103     0, /* di_connector_direction */
104     "Dreamcast Controller", /* di_product_name */
105     "di_product_license", /* di_product_license */
106     LE16_TO_HOST(100), /* di_standby_power */
107     LE16_TO_HOST(100) /* di_max_power */
108     }
109     };
110     static struct maple_device maple_device_keyboard = {
111     {
112     BE32_TO_HOST(MAPLE_FUNC(MAPLE_FN_KEYBOARD)),/* di_func */
113     { LE32_TO_HOST(2),0,0 }, /* di_function_data[3] */
114     0, /* di_area_code */
115     0, /* di_connector_direction */
116     "Keyboard", /* di_product_name */
117     "di_product_license", /* di_product_license */
118     LE16_TO_HOST(100), /* di_standby_power */
119     LE16_TO_HOST(100) /* di_max_power */
120     }
121     };
122     #if 0
123     static struct maple_device maple_device_mouse = {
124     {
125     BE32_TO_HOST(MAPLE_FUNC(MAPLE_FN_MOUSE)),/* di_func */
126     { 0,0,0 }, /* di_function_data[3] */
127     0, /* di_area_code */
128     0, /* di_connector_direction */
129     "Dreamcast Mouse", /* di_product_name */
130     "di_product_license", /* di_product_license */
131     LE16_TO_HOST(100), /* di_standby_power */
132     LE16_TO_HOST(100) /* di_max_power */
133     }
134     };
135     #endif
136    
137    
138     DEVICE_TICK(maple)
139     {
140     struct dreamcast_maple_data *d = (struct dreamcast_maple_data *) extra;
141     int control_bits, key = console_readchar(d->console_handle);
142    
143     if (key < 0)
144     return;
145    
146     /* Add to the keyboard queue: */
147     d->char_queue[d->char_queue_head] = key;
148     d->char_queue_head = (d->char_queue_head + 1) % MAX_CHARS;
149     if (d->char_queue_head == d->char_queue_tail)
150     fatal("[ dreamcast_maple: KEYBOARD QUEUE OVERRUN! ]\n");
151    
152     control_bits = 0;
153     switch (key) {
154     case 'a':
155     case 'A':
156     control_bits = 0x0004;
157     break;
158     case 'b':
159     case 'B':
160     control_bits = 0x0002;
161     break;
162     case 'c':
163     case 'C':
164     control_bits = 0x0001;
165     break;
166     case 'x':
167     case 'X':
168     control_bits = 0x0400;
169     break;
170     case 'y':
171     case 'Y':
172     control_bits = 0x0200;
173     break;
174     case 'z':
175     case 'Z':
176     control_bits = 0x0100;
177     break;
178     case 's':
179     case 'S': /* Start */
180     control_bits = 0x0008;
181     break;
182     case '8': /* up */
183     control_bits = 0x0010;
184     break;
185     case '2': /* down */
186     case 'k':
187     control_bits = 0x0020;
188     break;
189     case '4': /* left */
190     case 'u':
191     control_bits = 0x0040;
192     break;
193     case '6': /* right */
194     case 'o':
195     control_bits = 0x0080;
196     break;
197     }
198    
199     if (control_bits != 0) {
200     /* Add to the controller queue: */
201     d->controller_queue[d->controller_queue_head] = control_bits;
202     d->controller_queue_head =
203     (d->controller_queue_head + 1) % MAX_CONTROLLER_DATA;
204     if (d->controller_queue_head == d->controller_queue_tail)
205     fatal("[ dreamcast_maple: CONTROLLER QUEUE "
206     "OVERRUN! ]\n");
207     }
208     }
209    
210    
211     static int get_key(struct dreamcast_maple_data *d)
212     {
213     int key = d->char_queue[d->char_queue_tail];
214     if (d->char_queue_head == d->char_queue_tail)
215     return -1;
216    
217     d->char_queue_tail = (d->char_queue_tail + 1) % MAX_CHARS;
218     return key;
219     }
220    
221    
222     static int get_controller(struct dreamcast_maple_data *d)
223     {
224     int c = d->controller_queue[d->controller_queue_tail];
225     if (d->controller_queue_head == d->controller_queue_tail)
226     return 0;
227    
228     d->controller_queue_tail = (d->controller_queue_tail + 1)
229     % MAX_CONTROLLER_DATA;
230     return c;
231     }
232    
233    
234     /*
235     * maple_getcond_controller_response():
236     *
237     * Generate a controller response. Based on info from Marcus
238     * Comstedt's page: http://mc.pp.se/dc/controller.html
239     */
240     static void maple_getcond_controller_response(struct dreamcast_maple_data *d,
241     struct cpu *cpu, int port, uint32_t receive_addr)
242     {
243     uint8_t buf[8];
244     uint32_t response_code, transfer_code;
245     int c;
246    
247     transfer_code = (MAPLE_RESPONSE_DATATRF << 24) |
248     (((port << 6) | 0x20) << 16) |
249     ((port << 6) << 8) |
250     3 /* Transfer length in 32-bit words */;
251     transfer_code = BE32_TO_HOST(transfer_code);
252     cpu->memory_rw(cpu, cpu->mem, receive_addr, (void *) &transfer_code,
253     4, MEM_WRITE, NO_EXCEPTIONS | PHYSICAL);
254     receive_addr += 4;
255    
256     response_code = BE32_TO_HOST(MAPLE_FUNC(MAPLE_FN_CONTROLLER));
257     cpu->memory_rw(cpu, cpu->mem, receive_addr, (void *) &response_code,
258     4, MEM_WRITE, NO_EXCEPTIONS | PHYSICAL);
259     receive_addr += 4;
260    
261     /* NOTE: Inverse of the buttons pressed! */
262     c = ~get_controller(d);
263    
264     /*
265     * buf[0..1] = little endian button bitfield
266     * buf[2] = right analogue trigger (0-255)
267     * buf[3] = left analogue trigger (0-255)
268     * buf[4] = analogue joystick X (0-255)
269     * buf[5] = analogue joystick Y (0-255)
270     * buf[6] = second analogue joystick X (0-255)
271     * buf[7] = second analogue joystick Y (0-255)
272     */
273     memset(buf, 0, 8);
274     buf[0] = c & 0xff;
275     buf[1] = c >> 8;
276     buf[4] = buf[5] = buf[6] = buf[7] = 0;
277    
278     cpu->memory_rw(cpu, cpu->mem, receive_addr, (void *) &buf, 8,
279     MEM_WRITE, NO_EXCEPTIONS | PHYSICAL);
280     }
281    
282    
283     /*
284     * maple_getcond_keyboard_response():
285     *
286     * Generate a keyboard key-press response. Based on info from Marcus
287     * Comstedt's page: http://mc.pp.se/dc/kbd.html
288     */
289     static void maple_getcond_keyboard_response(struct dreamcast_maple_data *d,
290     struct cpu *cpu, int port, uint32_t receive_addr)
291     {
292     int key;
293     uint8_t buf[8];
294     uint32_t response_code, transfer_code;
295    
296     transfer_code = (MAPLE_RESPONSE_DATATRF << 24) |
297     (((port << 6) | 0x20) << 16) |
298     ((port << 6) << 8) |
299     3 /* Transfer length in 32-bit words */;
300     transfer_code = BE32_TO_HOST(transfer_code);
301     cpu->memory_rw(cpu, cpu->mem, receive_addr, (void *) &transfer_code,
302     4, MEM_WRITE, NO_EXCEPTIONS | PHYSICAL);
303     receive_addr += 4;
304    
305     response_code = BE32_TO_HOST(MAPLE_FUNC(MAPLE_FN_KEYBOARD));
306     cpu->memory_rw(cpu, cpu->mem, receive_addr, (void *) &response_code,
307     4, MEM_WRITE, NO_EXCEPTIONS | PHYSICAL);
308     receive_addr += 4;
309    
310     key = get_key(d);
311    
312     /*
313     * buf[0] = shift keys (1 = ctrl, 2 = shift)
314     * buf[1] = led state
315     * buf[2] = key
316     */
317     memset(buf, 0, 8);
318    
319     if (key >= 'a' && key <= 'z') buf[2] = 4 + key - 'a';
320     if (key >= 'A' && key <= 'Z') buf[0] = 2, buf[2] = 4 + key - 'A';
321     if (key >= 1 && key <= 26) buf[0] = 1, buf[2] = 4 + key - 1;
322     if (key >= '1' && key <= '9') buf[2] = 0x1e + key - '1';
323     if (key == '!') buf[0] = 2, buf[2] = 0x1e;
324     if (key == '"') buf[0] = 2, buf[2] = 0x1f;
325     if (key == '#') buf[0] = 2, buf[2] = 0x20;
326     if (key == '$') buf[0] = 2, buf[2] = 0x21;
327     if (key == '%') buf[0] = 2, buf[2] = 0x22;
328     if (key == '^') buf[0] = 2, buf[2] = 0x23;
329     if (key == '&') buf[0] = 2, buf[2] = 0x24;
330     if (key == '*') buf[0] = 2, buf[2] = 0x25;
331     if (key == '(') buf[0] = 2, buf[2] = 0x26;
332     if (key == '@') buf[0] = 2, buf[2] = 0x1f;
333     if (key == '\n' || key == '\r') buf[0] = 0, buf[2] = 0x28;
334     if (key == ')') buf[0] = 2, buf[2] = 0x27;
335     if (key == '\b') buf[0] = 0, buf[2] = 0x2a;
336     if (key == '\t') buf[0] = 0, buf[2] = 0x2b;
337     if (key == ' ') buf[0] = 0, buf[2] = 0x2c;
338     if (key == '0') buf[2] = 0x27;
339     if (key == 27) buf[2] = 0x29;
340     if (key == '-') buf[2] = 0x2d;
341     if (key == '=') buf[2] = 0x2e;
342     if (key == '[') buf[2] = 0x2f;
343     if (key == '\\') buf[2] = 0x31;
344     if (key == '|') buf[2] = 0x31, buf[0] = 2;
345     if (key == ']') buf[2] = 0x32;
346     if (key == ';') buf[2] = 0x33;
347     if (key == ':') buf[2] = 0x34;
348     if (key == ',') buf[2] = 0x36;
349     if (key == '.') buf[2] = 0x37;
350     if (key == '/') buf[2] = 0x38;
351     if (key == '<') buf[2] = 0x36, buf[0] = 2;
352     if (key == '>') buf[2] = 0x37, buf[0] = 2;
353     if (key == '?') buf[2] = 0x38, buf[0] = 2;
354     if (key == '+') buf[2] = 0x57;
355    
356     cpu->memory_rw(cpu, cpu->mem, receive_addr, (void *) &buf, 8,
357     MEM_WRITE, NO_EXCEPTIONS | PHYSICAL);
358     }
359    
360    
361     /*
362     * maple_do_dma_xfer():
363     *
364     * Perform a DMA transfer. enable should be 1, and dmaaddr should point to
365     * the memory to transfer.
366     */
367     void maple_do_dma_xfer(struct cpu *cpu, struct dreamcast_maple_data *d)
368     {
369     uint32_t addr = d->dmaaddr;
370    
371     if (!d->enable) {
372     fatal("[ maple_do_dma_xfer: not enabled? ]\n");
373     return;
374     }
375    
376     /* debug("[ dreamcast_maple: DMA transfer, dmaaddr = "
377     "0x%08"PRIx32" ]\n", addr); */
378    
379     /*
380     * DMA transfers must be 32-byte aligned, according to Marcus
381     * Comstedt's Maple demo program.
382     */
383     if (addr & 0x1f) {
384     fatal("[ dreamcast_maple: dmaaddr 0x%08"PRIx32" is NOT"
385     " 32-byte aligned; aborting ]\n", addr);
386     return;
387     }
388    
389     /*
390     * Handle one or more requests/responses:
391     *
392     * (This is "reverse engineered" from Comstedt's maple demo program;
393     * it might not be good enough to emulate how the Maple is being
394     * used by other programs.)
395     */
396     for (;;) {
397     uint32_t receive_addr, response_code, cond;
398     int datalen, port, last_message, cmd, to, from, datalen_cmd;
399     int unit;
400     uint8_t buf[8];
401    
402     /* Read the message' two control words: */
403     cpu->memory_rw(cpu, cpu->mem, addr, (void *) &buf, 8, MEM_READ,
404     NO_EXCEPTIONS | PHYSICAL);
405     addr += 8;
406    
407     datalen = buf[0] * sizeof(uint32_t);
408     if (buf[1] & 2) {
409     fatal("[ dreamcast_maple: TODO: GUN bit. ]\n");
410     /* TODO: Set some bits in A05F80C4 to indicate
411     which raster position a lightgun is pointing
412     at! */
413     exit(1);
414     }
415     port = buf[2];
416     last_message = buf[3] & 0x80;
417     receive_addr = buf[4] + (buf[5] << 8) + (buf[6] << 16)
418     + (buf[7] << 24);
419    
420     if (receive_addr & 0xe000001f)
421     fatal("[ dreamcast_maple: WARNING! receive address 0x"
422     "%08"PRIx32" isn't valid! ]\n", receive_addr);
423    
424     /* Read the command word for this message: */
425     cpu->memory_rw(cpu, cpu->mem, addr, (void *) &buf, 4, MEM_READ,
426     NO_EXCEPTIONS | PHYSICAL);
427     addr += 4;
428    
429     cmd = buf[0];
430     to = buf[1];
431     from = buf[2];
432     datalen_cmd = buf[3];
433    
434     /* Decode the unit number: */
435     unit = 0;
436     switch (to & 0x3f) {
437     case 0x00:
438     case 0x20: unit = 0; break;
439     case 0x01: unit = 1; break;
440     case 0x02: unit = 2; break;
441     case 0x04: unit = 3; break;
442     case 0x08: unit = 4; break;
443     case 0x10: unit = 5; break;
444     default: fatal("[ dreamcast_maple: ERROR! multiple "
445     "units? Not yet implemented. to = 0x%02x ]\n", to);
446     exit(1);
447     }
448    
449     /* debug("[ dreamcast_maple: cmd=0x%02x, port=%c, unit=%i"
450     ", datalen=%i words ]\n", cmd, port+'A', unit,
451     datalen_cmd); */
452    
453     /*
454     * Handle the command:
455     */
456     switch (cmd) {
457    
458     case MAPLE_COMMAND_DEVINFO:
459     if (d->device[port] == NULL || unit != 0) {
460     /* No device present: Timeout. */
461     /* debug("[ dreamcast_maple: response="
462     "timeout ]\n"); */
463     response_code = (uint32_t) -1;
464     response_code = LE32_TO_HOST(response_code);
465     cpu->memory_rw(cpu, cpu->mem, receive_addr,
466     (void *) &response_code, 4, MEM_WRITE,
467     NO_EXCEPTIONS | PHYSICAL);
468     } else {
469     /* Device present: */
470     int i;
471     struct maple_devinfo *di =
472     &d->device[port]->devinfo;
473     /* debug("[ dreamcast_maple: response="
474     "\"%s\" ]\n", di->di_product_name); */
475     response_code = MAPLE_RESPONSE_DEVINFO |
476     (((port << 6) | 0x20) << 8) |
477     ((port << 6) << 16) |
478     ((sizeof(struct maple_devinfo) /
479     sizeof(uint32_t)) << 24);
480     response_code = LE32_TO_HOST(response_code);
481     cpu->memory_rw(cpu, cpu->mem, receive_addr,
482     (void *) &response_code, 4, MEM_WRITE,
483     NO_EXCEPTIONS | PHYSICAL);
484     for (i=0; i<sizeof(struct maple_devinfo); i++)
485     cpu->memory_rw(cpu, cpu->mem,
486     receive_addr + 4 + i, (unsigned
487     char *) di + i, 1, MEM_WRITE,
488     NO_EXCEPTIONS | PHYSICAL);
489     }
490     break;
491    
492     case MAPLE_COMMAND_GETCOND:
493     cpu->memory_rw(cpu, cpu->mem, addr, (void *) &buf, 4,
494     MEM_READ, NO_EXCEPTIONS | PHYSICAL);
495     cond = buf[3] + (buf[2] << 8) + (buf[1] << 16)
496     + (buf[0] << 24);
497     if (cond & MAPLE_FUNC(MAPLE_FN_CONTROLLER)) {
498     maple_getcond_controller_response(
499     d, cpu, port, receive_addr);
500     } else if (cond & MAPLE_FUNC(MAPLE_FN_KEYBOARD)) {
501     maple_getcond_keyboard_response(
502     d, cpu, port, receive_addr);
503     } else {
504     fatal("[ dreamcast_maple: WARNING: GETCOND: "
505     "UNIMPLEMENTED 0x%08"PRIx32" ]\n", cond);
506     }
507     break;
508    
509     case MAPLE_COMMAND_BWRITE:
510     fatal("[ dreamcast_maple: BWRITE: TODO ]\n");
511     break;
512    
513     default:fatal("[ dreamcast_maple: command %i: TODO ]\n", cmd);
514     exit(1);
515     }
516    
517     addr += datalen_cmd * 4;
518    
519     /* Last request? Then stop. */
520     if (last_message)
521     break;
522     }
523    
524     /* Assert the SYSASIC_EVENT_MAPLE_DMADONE event: */
525     SYSASIC_TRIGGER_EVENT(SYSASIC_EVENT_MAPLE_DMADONE);
526     }
527    
528    
529     DEVICE_ACCESS(dreamcast_maple)
530     {
531     struct dreamcast_maple_data *d = (struct dreamcast_maple_data *) extra;
532     uint64_t idata = 0, odata = 0;
533    
534     if (writeflag == MEM_WRITE)
535     idata = memory_readmax64(cpu, data, len);
536    
537     switch (relative_addr) {
538    
539     case 0x04: /* MAPLE_DMAADDR */
540     if (writeflag == MEM_WRITE) {
541     d->dmaaddr = idata;
542     /* debug("[ dreamcast_maple: dmaaddr set to 0x%08x"
543     " ]\n", d->dmaaddr); */
544     } else {
545     fatal("[ dreamcast_maple: TODO: read from dmaaddr ]\n");
546     odata = d->dmaaddr;
547     }
548     break;
549    
550     case 0x10: /* MAPLE_RESET2 */
551     if (writeflag == MEM_WRITE && idata != 0)
552     fatal("[ dreamcast_maple: UNIMPLEMENTED reset2 value"
553     " 0x%08x ]\n", (int)idata);
554     break;
555    
556     case 0x14: /* MAPLE_ENABLE */
557     if (writeflag == MEM_WRITE)
558     d->enable = idata;
559     else
560     odata = d->enable;
561     break;
562    
563     case 0x18: /* MAPLE_STATE */
564     if (writeflag == MEM_WRITE) {
565     switch (idata) {
566     case 0: break;
567     case 1: maple_do_dma_xfer(cpu, d);
568     break;
569     default:fatal("[ dreamcast_maple: UNIMPLEMENTED "
570     "state value %i ]\n", (int)idata);
571     }
572     } else {
573     /* Always return 0 to indicate DMA xfer complete. */
574     odata = 0;
575     }
576     break;
577    
578     case 0x80: /* MAPLE_SPEED */
579     if (writeflag == MEM_WRITE) {
580     d->timeout = (idata >> 16) & 0xffff;
581     /* TODO: Bits 8..9 are "speed", but only the value
582     0 (indicating 2 Mbit/s) should be used. */
583     debug("[ dreamcast_maple: timeout set to %i ]\n",
584     d->timeout);
585     } else {
586     odata = d->timeout << 16;
587     }
588     break;
589    
590     case 0x8c: /* MAPLE_RESET */
591     if (writeflag == MEM_WRITE) {
592     if (idata != 0x6155404f)
593     fatal("[ dreamcast_maple: UNIMPLEMENTED reset "
594     "value 0x%08x ]\n", (int)idata);
595     d->enable = 0;
596     }
597     break;
598    
599     default:if (writeflag == MEM_READ) {
600     fatal("[ dreamcast_maple: UNIMPLEMENTED read from "
601     "addr 0x%x ]\n", (int)relative_addr);
602     } else {
603     fatal("[ dreamcast_maple: UNIMPLEMENTED write to addr "
604     "0x%x: 0x%x ]\n", (int)relative_addr, (int)idata);
605     }
606     }
607    
608     if (writeflag == MEM_READ)
609     memory_writemax64(cpu, data, len, odata);
610    
611     return 1;
612     }
613    
614    
615     DEVINIT(dreamcast_maple)
616     {
617     struct machine *machine = devinit->machine;
618     struct dreamcast_maple_data *d =
619     malloc(sizeof(struct dreamcast_maple_data));
620     if (d == NULL) {
621     fprintf(stderr, "out of memory\n");
622     exit(1);
623     }
624     memset(d, 0, sizeof(struct dreamcast_maple_data));
625    
626     memory_device_register(machine->memory, devinit->name,
627     0x5f6c00, 0x100, dev_dreamcast_maple_access, d, DM_DEFAULT, NULL);
628    
629     /* Devices connected to port A..D: */
630     d->device[0] = &maple_device_controller;
631     d->device[1] = NULL;
632     d->device[2] = &maple_device_keyboard;
633     d->device[3] = NULL; /* TODO: &maple_device_mouse; */
634    
635     d->console_handle = console_start_slave_inputonly(machine, "maple", 1);
636     machine->main_console_handle = d->console_handle;
637    
638     machine_add_tickfunction(devinit->machine, dev_maple_tick, d,
639     MAPLE_TICK_SHIFT, 0.0);
640    
641     return 1;
642     }
643    
  ViewVC Help
Powered by ViewVC 1.1.26