Search
lxdream.org :: lxdream/src/maple/maple.c
Latest Version
lxdream 0.9.1
released Jun 29
Download Now
Navigation
News Download Mailing Lists Mercurial Issues Dreamcast Wiki FAQ Forums
tree revision 490:1e0f9940e064
Jump to:
summary | tree | shortlog | changelog | graph | changeset

 

filename src/maple/maple.c
changeset 480:d28c2992f5ee
prev450:207461e79f21
next494:67c133a17400
author nkeynes
date Sun Nov 04 08:49:18 2007 +0000 (16 years ago)
permissions -rw-r--r--
last change Fix pointer=>int conversions to use intptr_t types
view annotate diff log raw 
     1 /**

     2  * $Id: maple.c,v 1.12 2007-10-31 11:53:35 nkeynes Exp $

     3  *

     4  * Implements the core Maple bus, including DMA transfers to and from the bus.

     5  *

     6  * Copyright (c) 2005 Nathan Keynes.

     7  *

     8  * This program is free software; you can redistribute it and/or modify

     9  * it under the terms of the GNU General Public License as published by

    10  * the Free Software Foundation; either version 2 of the License, or

    11  * (at your option) any later version.

    12  *

    13  * This program is distributed in the hope that it will be useful,

    14  * but WITHOUT ANY WARRANTY; without even the implied warranty of

    15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    16  * GNU General Public License for more details.

    17  */

    18 #define MODULE maple_module

    19 

    20 #include <assert.h>

    21 #include <glib/gstrfuncs.h>

    22 #include "dream.h"

    23 #include "mem.h"

    24 #include "asic.h"

    25 #include "maple.h"

    26 

    27 void maple_init( void );

    28 

    29 struct dreamcast_module maple_module = { "Maple", maple_init, NULL, NULL, NULL,

    30 					 NULL, NULL, NULL };

    31 

    32 struct maple_device_class *maple_device_classes[] = { &controller_class, NULL };

    33 

    34 void maple_init( void )

    35 {

    36 

    37 }

    38 

    39 maple_device_t maple_new_device( const gchar *name )

    40 {

    41     maple_device_class_t clz = maple_get_device_class(name);

    42     if( clz != NULL ) {

    43 	return clz->new_device();

    44     } 

    45     return NULL;

    46 }

    47 

    48 maple_device_class_t maple_get_device_class( const gchar *name )

    49 {

    50     int i;

    51     for( i=0; maple_device_classes[i] != NULL; i++ ) {

    52 	if( g_strcasecmp(maple_device_classes[i]->name, name ) == 0 )

    53 	    return maple_device_classes[i];

    54     }

    55     return NULL;

    56 }

    57 

    58 const struct maple_device_class **maple_get_device_classes()

    59 {

    60     return (const struct maple_device_class **)maple_device_classes;

    61 }

    62 

    63 lxdream_config_entry_t maple_get_device_config( maple_device_t dev )

    64 {

    65     if( dev->get_config == NULL )

    66 	return NULL;

    67     return dev->get_config(dev);

    68 }

    69 

    70 /**

    71  * Input data looks like this:

    72  *    0: transfer control word

    73  *      0: length of data in words (not including 3 word header)

    74  *      1: low bit = lightgun mode

    75  *      2: low 2 bits = port # (0..3)

    76  *      3: 0x80 = last packet, 0x00 = normal packet

    77  *    4: output buffer address

    78  *    8: Command word

    79  *      8: command code

    80  *      9: destination address

    81  *     10: source address

    82  *     11: length of data in words (not including 3 word header)

    83  *   12: command-specific data

    84  */

    85 

    86 /**

    87  * array is [port][subperipheral], so [0][0] is main peripheral on port A,

    88  * [1][2] is the second subperipheral on port B and so on.

    89  */

    90 maple_device_t maple_devices[4][6];

    91 int maple_periph_mask[4];

    92 #define GETBYTE(n) ((uint32_t)(buf[n]))

    93 #define GETWORD(n) (*((uint32_t *)(buf+(n))))

    94 #define PUTBYTE(n,x) (buf[n] = (char)x)

    95 #define PUTWORD(n,x) (*((uint32_t *)(return_buf+(n))) = (x))

    96 

    97 maple_device_t maple_get_device( unsigned int port, unsigned int periph ) {

    98     if( port >= 4 )

    99 	return NULL;

   100     if( periph >= 6 )

   101 	return NULL;

   102     return maple_devices[port][periph];

   103 }

   104 

   105 void maple_handle_buffer( uint32_t address ) {

   106     unsigned char *buf = (unsigned char *)mem_get_region(address);

   107     if( buf == NULL ) {

   108         ERROR( "Invalid or unmapped buffer passed to maple (0x%08X)", address );

   109     } else {

   110         unsigned int last = 0;

   111         int i = 0, count;

   112         for( count=0; !last; count++ ) {

   113             unsigned int port, length, gun, periph, periph_id, out_length;

   114             unsigned int cmd, recv_addr, send_addr;

   115             uint32_t return_addr;

   116             unsigned char *return_buf;

   117             

   118             last = GETBYTE(3) & 0x80; /* indicates last packet */

   119             port = GETBYTE(2) & 0x03;

   120             gun = GETBYTE(1) & 0x01;

   121             length = GETBYTE(0) & 0xFF;

   122             return_addr = GETWORD(4);

   123 

   124             if( (return_addr & 0x1C000000) != 0x0C000000 ) {

   125 		ERROR( "Bad return address in maple packet: %08X", return_addr );

   126 		break;

   127             }

   128             return_buf = mem_get_region(return_addr);

   129             cmd = GETBYTE(8);

   130             recv_addr = GETBYTE(9);

   131             send_addr = GETBYTE(10);

   132             /* Sanity checks */

   133             if( GETBYTE(11) != length ||

   134                 send_addr >> 6 != port ||

   135                 recv_addr >> 6 != port ||

   136                 return_buf == NULL ) {

   137 		ERROR( "Received bad packet: %02X %02X %02X %02X  %02X %02X %02X %02X  %02X %02X %02X %02X",

   138 		       buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6], buf[7],

   139 		       buf[8], buf[9], buf[10], buf[11] );

   140 		break;

   141             }

   142             periph = 0;

   143             periph_id = recv_addr & 0x3F;

   144             if( periph_id != 0x20 ) {

   145                 for( i=0;i<5;i++ ) {

   146                     if( periph_id == (1<<i) ) {

   147                         periph = i+1;

   148                         break;

   149                     }

   150                 }

   151                 if( periph == 0 ) { /* Bad setting */

   152                     /* ERROR */

   153                 }

   154             }

   155 

   156             maple_device_t dev = maple_devices[port][periph];

   157             if( dev == NULL ) {

   158                 /* no device attached */

   159                 *((uint32_t *)return_buf) = -1;

   160             } else {

   161                 int status, func, block;

   162                 out_length = 0;

   163                 switch( cmd ) {

   164                     case MAPLE_CMD_INFO:

   165                         status = MAPLE_RESP_INFO;

   166                         memcpy( return_buf+4, dev->ident, 112 );

   167                         out_length = 0x1C;

   168                         break;

   169                     case MAPLE_CMD_EXT_INFO:

   170                         status = MAPLE_RESP_EXT_INFO;

   171                         memcpy( return_buf+4, dev->ident, 192 );

   172                         out_length = 0x30;

   173                         break;

   174                     case MAPLE_CMD_RESET:

   175                         if( dev->reset == NULL )

   176                             status = MAPLE_RESP_ACK;

   177                         else status = dev->reset(dev);

   178                         break;

   179                     case MAPLE_CMD_SHUTDOWN:

   180                         if( dev->shutdown == NULL )

   181                             status = MAPLE_RESP_ACK;

   182                         else status = dev->shutdown(dev);

   183                         break;

   184                     case MAPLE_CMD_GET_COND:

   185                         func = GETWORD(12);

   186                         if( dev->get_condition == NULL )

   187                             status = MAPLE_ERR_CMD_UNKNOWN;

   188                         else status = dev->get_condition(dev, func,

   189                                                          return_buf+8,

   190                                                          &out_length );

   191 			out_length++;

   192                         if( status == 0 ) {

   193                             status = MAPLE_RESP_DATA;

   194                             PUTWORD(4,func);

   195                         }

   196                         break;

   197                     case MAPLE_CMD_SET_COND:

   198                         func = GETWORD(12);

   199                         if( dev->set_condition == NULL )

   200                             status = MAPLE_ERR_CMD_UNKNOWN;

   201                         else status = dev->set_condition(dev, func,

   202                                                          buf+16,

   203                                                          length);

   204                         if( status == 0 )

   205                             status = MAPLE_RESP_ACK;

   206                         break;

   207                     case MAPLE_CMD_READ_BLOCK:

   208                         func = GETWORD(12);

   209                         block = GETWORD(16);

   210                         if( dev->read_block == NULL )

   211                             status = MAPLE_ERR_CMD_UNKNOWN;

   212                         else status = dev->read_block(dev, func, block,

   213                                                       return_buf+12,

   214                                                       &out_length );

   215                         if( status == 0 ) {

   216                             status = MAPLE_RESP_DATA;

   217                             PUTWORD(4,func);

   218                             PUTWORD(8,block);

   219                         }

   220                         break;

   221                     case MAPLE_CMD_WRITE_BLOCK:

   222                         func = GETWORD(12);

   223                         block = GETWORD(16);

   224                         if( dev->write_block == NULL )

   225                             status = MAPLE_ERR_CMD_UNKNOWN;

   226                         else {

   227                             status = dev->write_block(dev, func, block, 

   228                                                       buf+20, length);

   229                             if( status == 0 )

   230                                 status = MAPLE_RESP_ACK;

   231                         }

   232                         break;

   233                     default:

   234                         status = MAPLE_ERR_CMD_UNKNOWN;

   235                 }

   236                 return_buf[0] = status;

   237                 return_buf[1] = send_addr;

   238                 return_buf[2] = recv_addr;

   239                 if( periph == 0 )

   240                     return_buf[2] |= maple_periph_mask[port];

   241                 return_buf[3] = out_length;

   242             }

   243             buf += 12 + (length<<2);

   244 	    address += 12 + (length<<2);

   245         }

   246         asic_event( EVENT_MAPLE_DMA );

   247     }

   248 }

   249 

   250 void maple_attach_device( maple_device_t dev, unsigned int port,

   251                           unsigned int periph ) {

   252     assert( port < 4 );

   253     assert( periph < 6 );

   254 

   255     if( maple_devices[port][periph] != NULL ) {

   256         /* Detach existing peripheral first */

   257         maple_detach_device( port, periph );

   258     }

   259     

   260     maple_devices[port][periph] = dev;

   261     if( periph != 0 )

   262         maple_periph_mask[port] |= (1<<(periph-1));

   263     else maple_periph_mask[port] |= 0x20;

   264     if( dev->attach != NULL ) {

   265         dev->attach( dev );

   266     }

   267 }

   268 

   269 void maple_detach_device( unsigned int port, unsigned int periph ) {

   270     assert( port < 4 );

   271     assert( periph < 6 );

   272 

   273     maple_device_t dev = maple_devices[port][periph];

   274     if( dev == NULL ) /* already detached */

   275         return;

   276     maple_devices[port][periph] = NULL;

   277     if( dev->detach != NULL ) {

   278         dev->detach(dev);

   279     }

   280     if( dev->destroy != NULL ) {

   281 	dev->destroy(dev);

   282     }

   283     if( periph == 0 ) {

   284         /* If we detach the main peripheral, we also have to detach all the

   285          * subperipherals, or the system could get quite confused

   286          */

   287         int i;

   288         maple_periph_mask[port] = 0;

   289         for( i=1; i<6; i++ ) {

   290             maple_detach_device(port,i);

   291         }

   292     } else {

   293         maple_periph_mask[port] &= (~(1<<(periph-1)));

   294     }

   295     

   296 }

   297 

   298 void maple_detach_all() {

   299     int i, j;

   300     for( i=0; i<4; i++ ) {

   301 	for( j=0; j<6; j++ ) {

   302 	    if( maple_devices[i][j] != NULL ) {

   303 		maple_device_t dev = maple_devices[i][j];

   304 		if( dev->detach != NULL )

   305 		    dev->detach(dev);

   306 		if( dev->destroy != NULL )

   307 		    dev->destroy(dev);

   308 	    }

   309 	}

   310 	maple_periph_mask[i] = 0;

   311     }

   312 }

   313 

   314 void maple_reattach_all() {

   315     int i, j;

   316     for( i=0; i<4; i++ ) {

   317 	for( j=0; j<6; j++ ) {

   318 	    if( maple_devices[i][j] != NULL ) {

   319 		maple_device_t dev = maple_devices[i][j];

   320 		if( dev->attach != NULL )

   321 		    dev->attach(dev);

   322 	    }

   323 	}

   324     }

   325 }
.