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lxdream.org :: lxdream/src/maple/maple.c
lxdream 0.9.1
released Jun 29
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filename src/maple/maple.c
changeset 633:bbfc1a38ddb5
prev608:4f588e52bce0
next736:a02d1475ccfd
author nkeynes
date Tue Feb 12 21:05:34 2008 +0000 (11 years ago)
permissions -rw-r--r--
last change Fix return buffer size on get cond failure
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     1 /**
     2  * $Id$
     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
    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"
    27 void maple_init( void );
    29 struct dreamcast_module maple_module = { "Maple", maple_init, NULL, NULL, NULL,
    30 					 NULL, NULL, NULL };
    32 struct maple_device_class *maple_device_classes[] = { 
    33     &controller_class, &keyboard_class, &mouse_class, NULL };
    35 void maple_init( void )
    36 {
    38 }
    40 maple_device_t maple_new_device( const gchar *name )
    41 {
    42     maple_device_class_t clz = maple_get_device_class(name);
    43     if( clz != NULL ) {
    44 	return clz->new_device();
    45     } 
    46     return NULL;
    47 }
    49 maple_device_class_t maple_get_device_class( const gchar *name )
    50 {
    51     int i;
    52     for( i=0; maple_device_classes[i] != NULL; i++ ) {
    53 	if( g_strcasecmp(maple_device_classes[i]->name, name ) == 0 )
    54 	    return maple_device_classes[i];
    55     }
    56     return NULL;
    57 }
    59 const struct maple_device_class **maple_get_device_classes()
    60 {
    61     return (const struct maple_device_class **)maple_device_classes;
    62 }
    64 lxdream_config_entry_t maple_get_device_config( maple_device_t dev )
    65 {
    66     if( dev->get_config == NULL )
    67 	return NULL;
    68     return dev->get_config(dev);
    69 }
    71 /**
    72  * Input data looks like this:
    73  *    0: transfer control word
    74  *      0: length of data in words (not including 3 word header)
    75  *      1: low bit = lightgun mode
    76  *      2: low 2 bits = port # (0..3)
    77  *      3: 0x80 = last packet, 0x00 = normal packet
    78  *    4: output buffer address
    79  *    8: Command word
    80  *      8: command code
    81  *      9: destination address
    82  *     10: source address
    83  *     11: length of data in words (not including 3 word header)
    84  *   12: command-specific data
    85  */
    87 /**
    88  * array is [port][subperipheral], so [0][0] is main peripheral on port A,
    89  * [1][2] is the second subperipheral on port B and so on.
    90  */
    91 maple_device_t maple_devices[4][6];
    92 int maple_periph_mask[4];
    93 #define GETBYTE(n) ((uint32_t)(buf[n]))
    94 #define GETWORD(n) (*((uint32_t *)(buf+(n))))
    95 #define PUTBYTE(n,x) (buf[n] = (char)x)
    96 #define PUTWORD(n,x) (*((uint32_t *)(return_buf+(n))) = (x))
    98 maple_device_t maple_get_device( unsigned int port, unsigned int periph ) {
    99     if( port >= 4 )
   100 	return NULL;
   101     if( periph >= 6 )
   102 	return NULL;
   103     return maple_devices[port][periph];
   104 }
   106 void maple_handle_buffer( uint32_t address ) {
   107     unsigned char *buf = (unsigned char *)mem_get_region(address);
   108     if( buf == NULL ) {
   109         ERROR( "Invalid or unmapped buffer passed to maple (0x%08X)", address );
   110     } else {
   111         unsigned int last = 0;
   112         int i = 0, count;
   113         for( count=0; !last; count++ ) {
   114             unsigned int port, length, mode, periph, periph_id, out_length;
   115             unsigned int cmd, recv_addr, send_addr;
   116             uint32_t return_addr;
   117             unsigned char *return_buf;
   119             last = GETBYTE(3) & 0x80; /* indicates last packet */
   120             port = GETBYTE(2) & 0x03;
   121             mode = GETBYTE(1) & 0x07;
   122             length = GETBYTE(0) & 0xFF;
   123             return_addr = GETWORD(4);
   125 	    if( mode == 0x07 ) {
   126 		buf += 4;
   127 		address +=4; /* skip? */
   128 		continue;
   129 	    }
   130             if( (return_addr & 0x1C000000) != 0x0C000000 ) {
   131 		ERROR( "Bad return address in maple packet: %08X", return_addr );
   132 		break;
   133             }
   134             return_buf = mem_get_region(return_addr);
   135             cmd = GETBYTE(8);
   136             recv_addr = GETBYTE(9);
   137             send_addr = GETBYTE(10);
   138             /* Sanity checks */
   139             if( GETBYTE(11) != length ||
   140                 send_addr >> 6 != port ||
   141                 recv_addr >> 6 != port ||
   142                 return_buf == NULL ) {
   143 		ERROR( "Received bad packet: %02X %02X %02X %02X  %02X %02X %02X %02X  %02X %02X %02X %02X",
   144 		       buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6], buf[7],
   145 		       buf[8], buf[9], buf[10], buf[11] );
   146 		break;
   147             }
   148             periph = 0;
   149             periph_id = recv_addr & 0x3F;
   150             if( periph_id != 0x20 ) {
   151                 for( i=0;i<5;i++ ) {
   152                     if( periph_id == (1<<i) ) {
   153                         periph = i+1;
   154                         break;
   155                     }
   156                 }
   157                 if( periph == 0 ) { /* Bad setting */
   158                     /* ERROR */
   159                 }
   160             }
   162             maple_device_t dev = maple_devices[port][periph];
   163             if( dev == NULL ) {
   164                 /* no device attached */
   165                 *((uint32_t *)return_buf) = -1;
   166             } else {
   167                 int status, func, block;
   168                 out_length = 0;
   169                 switch( cmd ) {
   170                     case MAPLE_CMD_INFO:
   171                         status = MAPLE_RESP_INFO;
   172                         memcpy( return_buf+4, dev->ident, 112 );
   173                         out_length = 0x1C;
   174                         break;
   175                     case MAPLE_CMD_EXT_INFO:
   176                         status = MAPLE_RESP_EXT_INFO;
   177                         memcpy( return_buf+4, dev->ident, 192 );
   178                         out_length = 0x30;
   179                         break;
   180                     case MAPLE_CMD_RESET:
   181                         if( dev->reset == NULL )
   182                             status = MAPLE_RESP_ACK;
   183                         else status = dev->reset(dev);
   184                         break;
   185                     case MAPLE_CMD_SHUTDOWN:
   186                         if( dev->shutdown == NULL )
   187                             status = MAPLE_RESP_ACK;
   188                         else status = dev->shutdown(dev);
   189                         break;
   190                     case MAPLE_CMD_GET_COND:
   191                         func = GETWORD(12);
   192                         if( dev->get_condition == NULL )
   193                             status = MAPLE_ERR_CMD_UNKNOWN;
   194                         else status = dev->get_condition(dev, func,
   195                                                          return_buf+8,
   196                                                          &out_length );
   197                         if( status == 0 ) {
   198                             out_length++;
   199                             status = MAPLE_RESP_DATA;
   200                             PUTWORD(4,func);
   201                         }
   202                         break;
   203                     case MAPLE_CMD_SET_COND:
   204                         func = GETWORD(12);
   205                         if( dev->set_condition == NULL )
   206                             status = MAPLE_ERR_CMD_UNKNOWN;
   207                         else status = dev->set_condition(dev, func,
   208                                                          buf+16,
   209                                                          length);
   210                         if( status == 0 )
   211                             status = MAPLE_RESP_ACK;
   212                         break;
   213                     case MAPLE_CMD_READ_BLOCK:
   214                         func = GETWORD(12);
   215                         block = GETWORD(16);
   216                         if( dev->read_block == NULL )
   217                             status = MAPLE_ERR_CMD_UNKNOWN;
   218                         else status = dev->read_block(dev, func, block,
   219                                                       return_buf+12,
   220                                                       &out_length );
   221                         if( status == 0 ) {
   222                             status = MAPLE_RESP_DATA;
   223                             PUTWORD(4,func);
   224                             PUTWORD(8,block);
   225                         }
   226                         break;
   227                     case MAPLE_CMD_WRITE_BLOCK:
   228                         func = GETWORD(12);
   229                         block = GETWORD(16);
   230                         if( dev->write_block == NULL )
   231                             status = MAPLE_ERR_CMD_UNKNOWN;
   232                         else {
   233                             status = dev->write_block(dev, func, block, 
   234                                                       buf+20, length);
   235                             if( status == 0 )
   236                                 status = MAPLE_RESP_ACK;
   237                         }
   238                         break;
   239                     default:
   240                         status = MAPLE_ERR_CMD_UNKNOWN;
   241                 }
   242                 return_buf[0] = status;
   243                 return_buf[1] = send_addr;
   244                 return_buf[2] = recv_addr;
   245                 if( periph == 0 )
   246                     return_buf[2] |= maple_periph_mask[port];
   247                 return_buf[3] = out_length;
   248             }
   249             buf += 12 + (length<<2);
   250 	    address += 12 + (length<<2);
   251         }
   252         asic_event( EVENT_MAPLE_DMA );
   253     }
   254 }
   256 void maple_attach_device( maple_device_t dev, unsigned int port,
   257                           unsigned int periph ) {
   258     assert( port < 4 );
   259     assert( periph < 6 );
   261     if( maple_devices[port][periph] != NULL ) {
   262         /* Detach existing peripheral first */
   263         maple_detach_device( port, periph );
   264     }
   266     maple_devices[port][periph] = dev;
   267     if( periph != 0 )
   268         maple_periph_mask[port] |= (1<<(periph-1));
   269     else maple_periph_mask[port] |= 0x20;
   270     if( dev->attach != NULL ) {
   271         dev->attach( dev );
   272     }
   273 }
   275 void maple_detach_device( unsigned int port, unsigned int periph ) {
   276     assert( port < 4 );
   277     assert( periph < 6 );
   279     maple_device_t dev = maple_devices[port][periph];
   280     if( dev == NULL ) /* already detached */
   281         return;
   282     maple_devices[port][periph] = NULL;
   283     if( dev->detach != NULL ) {
   284         dev->detach(dev);
   285     }
   286     if( dev->destroy != NULL ) {
   287 	dev->destroy(dev);
   288     }
   289     if( periph == 0 ) {
   290         /* If we detach the main peripheral, we also have to detach all the
   291          * subperipherals, or the system could get quite confused
   292          */
   293         int i;
   294         maple_periph_mask[port] = 0;
   295         for( i=1; i<6; i++ ) {
   296             maple_detach_device(port,i);
   297         }
   298     } else {
   299         maple_periph_mask[port] &= (~(1<<(periph-1)));
   300     }
   302 }
   304 void maple_detach_all() {
   305     int i, j;
   306     for( i=0; i<4; i++ ) {
   307 	for( j=0; j<6; j++ ) {
   308 	    if( maple_devices[i][j] != NULL ) {
   309 		maple_device_t dev = maple_devices[i][j];
   310 		if( dev->detach != NULL )
   311 		    dev->detach(dev);
   312 		if( dev->destroy != NULL )
   313 		    dev->destroy(dev);
   314 	    }
   315 	}
   316 	maple_periph_mask[i] = 0;
   317     }
   318 }
   320 void maple_reattach_all() {
   321     int i, j;
   322     for( i=0; i<4; i++ ) {
   323 	for( j=0; j<6; j++ ) {
   324 	    if( maple_devices[i][j] != NULL ) {
   325 		maple_device_t dev = maple_devices[i][j];
   326 		if( dev->detach != NULL ) 
   327 		    dev->detach(dev);
   328 		if( dev->attach != NULL )
   329 		    dev->attach(dev);
   330 	    }
   331 	}
   332     }
   333 }
   335 void maple_default_destroy( maple_device_t mdev )
   336 {
   337     free(mdev);
   338 }
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