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| Rev | Author | Line No. | Line |
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| 538 | mauro | 1 | /* |
| 2 | * Project: S.Ha.R.K. |
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| 3 | * |
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| 4 | * Coordinators: |
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| 5 | * Giorgio Buttazzo <giorgio@sssup.it> |
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| 6 | * Paolo Gai <pj@gandalf.sssup.it> |
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| 7 | * |
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| 8 | * Authors : |
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| 9 | * Paolo Gai <pj@gandalf.sssup.it> |
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| 10 | * Massimiliano Giorgi <massy@gandalf.sssup.it> |
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| 11 | * Luca Abeni <luca@gandalf.sssup.it> |
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| 12 | * (see the web pages for full authors list) |
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| 13 | * |
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| 14 | * ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy) |
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| 15 | * |
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| 16 | * http://www.sssup.it |
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| 17 | * http://retis.sssup.it |
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| 18 | * http://shark.sssup.it |
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| 19 | */ |
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| 20 | |||
| 21 | /* |
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| 22 | * Copyright (C) 2000 Paolo Gai |
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| 23 | * |
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| 24 | * This program is free software; you can redistribute it and/or modify |
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| 25 | * it under the terms of the GNU General Public License as published by |
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| 26 | * the Free Software Foundation; either version 2 of the License, or |
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| 27 | * (at your option) any later version. |
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| 28 | * |
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| 29 | * This program is distributed in the hope that it will be useful, |
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| 30 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 31 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 32 | * GNU General Public License for more details. |
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| 33 | * |
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| 34 | * You should have received a copy of the GNU General Public License |
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| 35 | * along with this program; if not, write to the Free Software |
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| 36 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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| 37 | * |
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| 38 | */ |
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| 39 | |||
| 40 | /* Serial communication device */ |
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| 41 | /* This implementation is capable of handling 4 distinct COM ports */ |
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| 42 | /* The COM port settings are the standard PC settings: */ |
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| 43 | /* PORT ADDRESS IRQ */ |
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| 44 | /* 1 0x3F8 4 */ |
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| 45 | /* 2 0x2F8 3 */ |
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| 46 | /* 3 0x3E8 4 */ |
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| 47 | /* 4 0x2E8 2 */ |
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| 48 | |||
| 49 | /* By Massy |
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| 50 | * I have modified the fast handler routines to support serial |
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| 51 | * mouse better (see below) |
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| 52 | */ |
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| 53 | |||
| 54 | #include <kernel/kern.h> |
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| 55 | #include <drivers/scom.h> |
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| 56 | |||
| 57 | /* Base address for each standard COM link */ |
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| 58 | static unsigned com_base[] = {0x03F8,0x02F8,0x03E8,0x02E8}; |
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| 59 | |||
| 60 | /* Used for decoding the IIR status */ |
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| 61 | const int IIRbits[] = {MS_CHANGED,TX_EMPTY,RX_FULL,LS_CHANGED}; |
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| 62 | |||
| 63 | /* Register level access functions */ |
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| 64 | |||
| 65 | unsigned com_read(unsigned port,unsigned reg) |
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| 66 | { |
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| 67 | unsigned b; |
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| 68 | if (port > 3 || reg > 7) return(0); |
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| 69 | b = ll_in(com_base[port]+reg); |
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| 70 | return(b); |
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| 71 | } |
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| 72 | |||
| 73 | void com_write(unsigned port,unsigned reg,unsigned value) |
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| 74 | { |
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| 75 | if (port > 3 || reg > 7) return; |
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| 76 | ll_out(com_base[port]+reg,value); |
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| 77 | } |
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| 78 | |||
| 79 | /* Polled send/receive */ |
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| 80 | |||
| 81 | void com_send(unsigned port,BYTE b) |
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| 82 | { |
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| 83 | while ((com_read(port,LSR) & 32) == 0); |
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| 84 | com_write(port,THR,b); |
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| 85 | } |
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| 86 | |||
| 87 | unsigned com_receive(unsigned port) |
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| 88 | { |
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| 89 | while ((com_read(port,LSR) & 1) == 0); |
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| 90 | return(com_read(port,RBR)); |
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| 91 | } |
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| 92 | |||
| 93 | /* Initialize a serial channel */ |
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| 94 | |||
| 95 | int com_open(unsigned port,DWORD speed,BYTE parity,BYTE len,BYTE stop) |
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| 96 | { |
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| 97 | unsigned long div,b_mask; |
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| 714 | giacomo | 98 | SYS_FLAGS f; |
| 99 | |||
| 100 | f = kern_fsave(); |
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| 101 | |||
| 538 | mauro | 102 | /* Now set up the serial link */ |
| 103 | b_mask = (parity & 3) * 8 + (stop & 1) * 4 + ((len - 5) & 3); |
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| 104 | div = 115200L / speed; |
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| 105 | /* Clear serial interrupt enable register */ |
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| 106 | com_write(port,IER,0); |
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| 107 | /* Empty input buffer */ |
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| 108 | com_read(port,RBR); |
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| 109 | /* Activate DLAB bit for speed setting */ |
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| 110 | com_write(port,LCR,0x80); |
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| 111 | /* Load baud divisor */ |
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| 112 | com_write(port,0,div & 0x00FF); |
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| 113 | div >>= 8; |
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| 114 | com_write(port,1,div & 0x00FF); |
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| 115 | /* Load control word (parity,stop bit,bit len) */ |
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| 116 | com_write(port,LCR,b_mask); |
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| 117 | /* Attiva OUT1 & OUT2 */ |
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| 118 | com_write(port,MCR,0x0C); |
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| 119 | |||
| 714 | giacomo | 120 | kern_frestore(f); |
| 538 | mauro | 121 | |
| 714 | giacomo | 122 | return(0); |
| 123 | |||
| 538 | mauro | 124 | } |
| 125 | |||
| 126 | /* Close port channel & release the server */ |
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| 127 | |||
| 128 | int com_close(unsigned port) |
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| 129 | { |
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| 714 | giacomo | 130 | SYS_FLAGS f; |
| 538 | mauro | 131 | |
| 714 | giacomo | 132 | f = kern_fsave(); |
| 538 | mauro | 133 | |
| 714 | giacomo | 134 | com_write(port,IER,0); |
| 135 | com_read(port,IIR); |
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| 136 | com_read(port,RBR); |
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| 538 | mauro | 137 | |
| 714 | giacomo | 138 | kern_frestore(f); |
| 538 | mauro | 139 | |
| 714 | giacomo | 140 | return(0); |
| 538 | mauro | 141 | } |
| 142 |