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filename src/maple/maple.c
changeset 608:4f588e52bce0
prev561:533f6b478071
next633:bbfc1a38ddb5
author nkeynes
date Sat Jan 26 02:45:27 2008 +0000 (16 years ago)
permissions -rw-r--r--
last change Bug #50: Implement mouse and keyboard
view annotate diff log raw 
     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

    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[] = { 

    33     &controller_class, &keyboard_class, &mouse_class, NULL };

    34 

    35 void maple_init( void )

    36 {

    37 

    38 }

    39 

    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 }

    48 

    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 }

    58 

    59 const struct maple_device_class **maple_get_device_classes()

    60 {

    61     return (const struct maple_device_class **)maple_device_classes;

    62 }

    63 

    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 }

    70 

    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  */

    86 

    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))

    97 

    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 }

   105 

   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;

   118             

   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);

   124 

   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             }

   161 

   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 			out_length++;

   198                         if( status == 0 ) {

   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 }

   255 

   256 void maple_attach_device( maple_device_t dev, unsigned int port,

   257                           unsigned int periph ) {

   258     assert( port < 4 );

   259     assert( periph < 6 );

   260 

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

   262         /* Detach existing peripheral first */

   263         maple_detach_device( port, periph );

   264     }

   265     

   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 }

   274 

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

   276     assert( port < 4 );

   277     assert( periph < 6 );

   278 

   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     }

   301     

   302 }

   303 

   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 }

   319 

   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 }

   334 

   335 void maple_default_destroy( maple_device_t mdev )

   336 {

   337     free(mdev);

   338 }
.