nkeynes@31 | 1 | /**
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nkeynes@31 | 2 | * $Id: maple.c,v 1.5 2005-12-25 08:24:11 nkeynes Exp $
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nkeynes@31 | 3 | *
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nkeynes@31 | 4 | * Implements the core Maple bus, including DMA transfers to and from the bus.
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nkeynes@31 | 5 | *
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nkeynes@31 | 6 | * Copyright (c) 2005 Nathan Keynes.
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nkeynes@31 | 7 | *
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nkeynes@31 | 8 | * This program is free software; you can redistribute it and/or modify
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nkeynes@31 | 9 | * it under the terms of the GNU General Public License as published by
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nkeynes@31 | 10 | * the Free Software Foundation; either version 2 of the License, or
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nkeynes@31 | 11 | * (at your option) any later version.
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nkeynes@31 | 12 | *
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nkeynes@31 | 13 | * This program is distributed in the hope that it will be useful,
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nkeynes@31 | 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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nkeynes@31 | 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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nkeynes@31 | 16 | * GNU General Public License for more details.
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nkeynes@31 | 17 | */
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nkeynes@31 | 18 |
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nkeynes@1 | 19 | #include <assert.h>
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nkeynes@1 | 20 | #include "dream.h"
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nkeynes@15 | 21 | #include "modules.h"
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nkeynes@1 | 22 | #include "mem.h"
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nkeynes@1 | 23 | #include "asic.h"
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nkeynes@1 | 24 | #include "maple.h"
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nkeynes@1 | 25 |
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nkeynes@15 | 26 | void maple_init( void );
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nkeynes@15 | 27 |
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nkeynes@15 | 28 | struct dreamcast_module maple_module = { "Maple", maple_init, NULL, NULL, NULL,
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nkeynes@23 | 29 | NULL, NULL, NULL };
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nkeynes@15 | 30 |
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nkeynes@15 | 31 | void maple_init( void )
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nkeynes@15 | 32 | {
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nkeynes@15 | 33 |
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nkeynes@15 | 34 | }
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nkeynes@15 | 35 |
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nkeynes@2 | 36 | /**
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nkeynes@2 | 37 | * Input data looks like this:
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nkeynes@2 | 38 | * 0: transfer control word
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nkeynes@2 | 39 | * 0: length of data in words (not including 3 word header)
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nkeynes@2 | 40 | * 1: low bit = lightgun mode
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nkeynes@2 | 41 | * 2: low 2 bits = port # (0..3)
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nkeynes@2 | 42 | * 3: 0x80 = last packet, 0x00 = normal packet
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nkeynes@2 | 43 | * 4: output buffer address
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nkeynes@2 | 44 | * 8: Command word
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nkeynes@2 | 45 | * 8: command code
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nkeynes@2 | 46 | * 9: destination address
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nkeynes@2 | 47 | * 10: source address
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nkeynes@2 | 48 | * 11: length of data in words (not including 3 word header)
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nkeynes@2 | 49 | * 12: command-specific data
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nkeynes@2 | 50 | */
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nkeynes@2 | 51 |
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nkeynes@2 | 52 | /**
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nkeynes@2 | 53 | * array is [port][subperipheral], so [0][0] is main peripheral on port A,
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nkeynes@2 | 54 | * [1][2] is the second subperipheral on port B and so on.
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nkeynes@2 | 55 | */
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nkeynes@2 | 56 | maple_device_t maple_devices[4][6];
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nkeynes@2 | 57 | int maple_periph_mask[4];
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nkeynes@2 | 58 | #define GETBYTE(n) ((uint32_t)(buf[n]))
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nkeynes@2 | 59 | #define GETWORD(n) (*((uint32_t *)(buf+(n))))
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nkeynes@2 | 60 | #define PUTBYTE(n,x) (buf[n] = (char)x)
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nkeynes@2 | 61 | #define PUTWORD(n,x) (*((uint32_t *)(return_buf+(n))) = (x))
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nkeynes@2 | 62 |
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nkeynes@1 | 63 | void maple_handle_buffer( uint32_t address ) {
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nkeynes@2 | 64 | unsigned char *buf = (unsigned char *)mem_get_region(address);
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nkeynes@1 | 65 | if( buf == NULL ) {
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nkeynes@1 | 66 | ERROR( "Invalid or unmapped buffer passed to maple (0x%08X)", address );
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nkeynes@1 | 67 | } else {
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nkeynes@2 | 68 | unsigned int last = 0;
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nkeynes@2 | 69 | int i = 0, count;
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nkeynes@2 | 70 | for( count=0; !last; count++ ) {
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nkeynes@2 | 71 | unsigned int port, length, gun, periph, periph_id, out_length;
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nkeynes@2 | 72 | unsigned int cmd, recv_addr, send_addr;
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nkeynes@2 | 73 | uint32_t return_addr;
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nkeynes@2 | 74 | unsigned char *return_buf;
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nkeynes@1 | 75 |
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nkeynes@2 | 76 | last = GETBYTE(3) & 0x80; /* indicates last packet */
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nkeynes@2 | 77 | port = GETBYTE(2) & 0x03;
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nkeynes@2 | 78 | gun = GETBYTE(1) & 0x01;
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nkeynes@2 | 79 | length = GETBYTE(0) & 0xFF;
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nkeynes@2 | 80 | return_addr = GETWORD(4);
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nkeynes@2 | 81 | if( return_addr == 0 ) {
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nkeynes@2 | 82 | /* ERROR */
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nkeynes@2 | 83 | }
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nkeynes@2 | 84 | return_buf = mem_get_region(return_addr);
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nkeynes@2 | 85 | cmd = GETBYTE(8);
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nkeynes@2 | 86 | recv_addr = GETBYTE(9);
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nkeynes@2 | 87 | send_addr = GETBYTE(10);
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nkeynes@2 | 88 | /* Sanity checks */
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nkeynes@2 | 89 | if( GETBYTE(11) != length ||
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nkeynes@2 | 90 | send_addr != (port<<6) ||
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nkeynes@2 | 91 | recv_addr >> 6 != port ||
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nkeynes@2 | 92 | return_buf == NULL ) {
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nkeynes@2 | 93 | /* ERROR */
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nkeynes@2 | 94 | }
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nkeynes@2 | 95 | periph = 0;
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nkeynes@2 | 96 | periph_id = recv_addr & 0x3F;
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nkeynes@2 | 97 | if( periph_id != 0x20 ) {
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nkeynes@2 | 98 | for( i=0;i<5;i++ ) {
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nkeynes@2 | 99 | if( periph_id == (1<<i) ) {
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nkeynes@2 | 100 | periph = i+1;
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nkeynes@2 | 101 | break;
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nkeynes@2 | 102 | }
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nkeynes@2 | 103 | }
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nkeynes@2 | 104 | if( periph == 0 ) { /* Bad setting */
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nkeynes@2 | 105 | /* ERROR */
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nkeynes@2 | 106 | }
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nkeynes@2 | 107 | }
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nkeynes@2 | 108 |
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nkeynes@2 | 109 | INFO( "Maple packet %d: Cmd %d on port %d device %d", count, cmd, port, periph );
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nkeynes@2 | 110 | maple_device_t dev = maple_devices[port][periph];
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nkeynes@2 | 111 | if( dev == NULL ) {
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nkeynes@2 | 112 | /* no device attached */
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nkeynes@2 | 113 | *((uint32_t *)return_buf) = -1;
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nkeynes@2 | 114 | } else {
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nkeynes@2 | 115 | int status, func, block;
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nkeynes@2 | 116 | out_length = 0;
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nkeynes@2 | 117 | switch( cmd ) {
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nkeynes@2 | 118 | case MAPLE_CMD_INFO:
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nkeynes@2 | 119 | status = MAPLE_RESP_INFO;
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nkeynes@2 | 120 | memcpy( return_buf+4, dev->ident, 112 );
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nkeynes@2 | 121 | out_length = 0x1C;
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nkeynes@2 | 122 | break;
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nkeynes@2 | 123 | case MAPLE_CMD_EXT_INFO:
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nkeynes@2 | 124 | status = MAPLE_RESP_EXT_INFO;
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nkeynes@2 | 125 | memcpy( return_buf+4, dev->ident, 192 );
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nkeynes@2 | 126 | out_length = 0x30;
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nkeynes@2 | 127 | break;
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nkeynes@2 | 128 | case MAPLE_CMD_RESET:
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nkeynes@2 | 129 | if( dev->reset == NULL )
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nkeynes@2 | 130 | status = MAPLE_RESP_ACK;
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nkeynes@2 | 131 | else status = dev->reset(dev);
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nkeynes@2 | 132 | break;
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nkeynes@2 | 133 | case MAPLE_CMD_SHUTDOWN:
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nkeynes@2 | 134 | if( dev->shutdown == NULL )
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nkeynes@2 | 135 | status = MAPLE_RESP_ACK;
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nkeynes@2 | 136 | else status = dev->shutdown(dev);
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nkeynes@2 | 137 | break;
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nkeynes@2 | 138 | case MAPLE_CMD_GET_COND:
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nkeynes@2 | 139 | func = GETWORD(12);
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nkeynes@2 | 140 | if( dev->get_condition == NULL )
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nkeynes@2 | 141 | status = MAPLE_ERR_CMD_UNKNOWN;
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nkeynes@2 | 142 | else status = dev->get_condition(dev, func,
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nkeynes@2 | 143 | return_buf+8,
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nkeynes@2 | 144 | &out_length );
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nkeynes@2 | 145 | if( status == 0 ) {
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nkeynes@2 | 146 | status = MAPLE_RESP_DATA;
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nkeynes@2 | 147 | PUTWORD(4,func);
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nkeynes@2 | 148 | }
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nkeynes@2 | 149 | break;
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nkeynes@2 | 150 | case MAPLE_CMD_SET_COND:
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nkeynes@2 | 151 | func = GETWORD(12);
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nkeynes@2 | 152 | if( dev->set_condition == NULL )
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nkeynes@2 | 153 | status = MAPLE_ERR_CMD_UNKNOWN;
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nkeynes@2 | 154 | else status = dev->set_condition(dev, func,
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nkeynes@2 | 155 | buf+16,
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nkeynes@2 | 156 | length);
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nkeynes@2 | 157 | if( status == 0 )
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nkeynes@2 | 158 | status = MAPLE_RESP_ACK;
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nkeynes@2 | 159 | break;
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nkeynes@2 | 160 | case MAPLE_CMD_READ_BLOCK:
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nkeynes@2 | 161 | func = GETWORD(12);
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nkeynes@2 | 162 | block = GETWORD(16);
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nkeynes@2 | 163 | if( dev->read_block == NULL )
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nkeynes@2 | 164 | status = MAPLE_ERR_CMD_UNKNOWN;
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nkeynes@2 | 165 | else status = dev->read_block(dev, func, block,
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nkeynes@2 | 166 | return_buf+12,
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nkeynes@2 | 167 | &out_length );
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nkeynes@2 | 168 | if( status == 0 ) {
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nkeynes@2 | 169 | status = MAPLE_RESP_DATA;
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nkeynes@2 | 170 | PUTWORD(4,func);
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nkeynes@2 | 171 | PUTWORD(8,block);
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nkeynes@2 | 172 | }
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nkeynes@2 | 173 | break;
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nkeynes@2 | 174 | case MAPLE_CMD_WRITE_BLOCK:
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nkeynes@2 | 175 | func = GETWORD(12);
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nkeynes@2 | 176 | block = GETWORD(16);
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nkeynes@2 | 177 | if( dev->write_block == NULL )
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nkeynes@2 | 178 | status = MAPLE_ERR_CMD_UNKNOWN;
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nkeynes@2 | 179 | else {
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nkeynes@2 | 180 | status = dev->write_block(dev, func, block,
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nkeynes@2 | 181 | buf+20, length);
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nkeynes@2 | 182 | if( status == 0 )
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nkeynes@2 | 183 | status = MAPLE_RESP_ACK;
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nkeynes@2 | 184 | }
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nkeynes@2 | 185 | break;
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nkeynes@2 | 186 | default:
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nkeynes@2 | 187 | status = MAPLE_ERR_CMD_UNKNOWN;
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nkeynes@2 | 188 | }
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nkeynes@2 | 189 | return_buf[0] = status;
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nkeynes@2 | 190 | return_buf[1] = send_addr;
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nkeynes@2 | 191 | return_buf[2] = recv_addr;
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nkeynes@2 | 192 | if( periph == 0 )
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nkeynes@2 | 193 | return_buf[2] |= maple_periph_mask[port];
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nkeynes@2 | 194 | return_buf[3] = out_length;
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nkeynes@2 | 195 | }
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nkeynes@2 | 196 | buf += 12 + (length<<2);
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nkeynes@2 | 197 | }
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nkeynes@2 | 198 | asic_event( EVENT_MAPLE_DMA );
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nkeynes@1 | 199 | }
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nkeynes@1 | 200 | }
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nkeynes@2 | 201 |
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nkeynes@2 | 202 | void maple_attach_device( maple_device_t dev, unsigned int port,
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nkeynes@2 | 203 | unsigned int periph ) {
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nkeynes@2 | 204 | assert( port < 4 );
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nkeynes@2 | 205 | assert( periph < 6 );
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nkeynes@2 | 206 |
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nkeynes@2 | 207 | if( maple_devices[port][periph] != NULL ) {
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nkeynes@2 | 208 | /* Detach existing peripheral first */
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nkeynes@2 | 209 | maple_detach_device( port, periph );
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nkeynes@2 | 210 | }
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nkeynes@2 | 211 |
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nkeynes@2 | 212 | maple_devices[port][periph] = dev;
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nkeynes@2 | 213 | if( periph != 0 )
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nkeynes@2 | 214 | maple_periph_mask[port] |= (1<<(periph-1));
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nkeynes@2 | 215 | else maple_periph_mask[port] |= 0x20;
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nkeynes@2 | 216 | if( dev->attach != NULL ) {
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nkeynes@2 | 217 | dev->attach( dev );
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nkeynes@2 | 218 | }
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nkeynes@2 | 219 | }
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nkeynes@2 | 220 |
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nkeynes@2 | 221 | void maple_detach_device( unsigned int port, unsigned int periph ) {
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nkeynes@2 | 222 | assert( port < 4 );
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nkeynes@2 | 223 | assert( periph < 6 );
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nkeynes@2 | 224 |
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nkeynes@2 | 225 | maple_device_t dev = maple_devices[port][periph];
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nkeynes@2 | 226 | if( dev == NULL ) /* already detached */
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nkeynes@2 | 227 | return;
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nkeynes@2 | 228 | maple_devices[port][periph] = NULL;
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nkeynes@2 | 229 | if( dev->detach != NULL ) {
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nkeynes@2 | 230 | dev->detach(dev);
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nkeynes@2 | 231 | }
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nkeynes@2 | 232 | if( periph == 0 ) {
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nkeynes@2 | 233 | /* If we detach the main peripheral, we also have to detach all the
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nkeynes@2 | 234 | * subperipherals, or the system could get quite confused
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nkeynes@2 | 235 | */
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nkeynes@2 | 236 | int i;
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nkeynes@2 | 237 | maple_periph_mask[port] = 0;
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nkeynes@2 | 238 | for( i=1; i<6; i++ ) {
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nkeynes@2 | 239 | maple_detach_device(port,i);
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nkeynes@2 | 240 | }
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nkeynes@2 | 241 | } else {
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nkeynes@2 | 242 | maple_periph_mask[port] &= (~(1<<(periph-1)));
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nkeynes@2 | 243 | }
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nkeynes@2 | 244 |
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nkeynes@2 | 245 | }
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