1 | /* |
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2 | * Copyright (c) 1994 Charles Hannum. All rights reserved. |
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3 | * |
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4 | * Redistribution and use in source and binary forms, with or without |
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5 | * modification, are permitted provided that the following conditions |
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6 | * are met: |
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7 | * 1. Redistributions of source code must retain the above copyright |
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8 | * notice, this list of conditions and the following disclaimer. |
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9 | * 2. Redistributions in binary form must reproduce the above copyright |
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10 | * notice, this list of conditions and the following disclaimer in the |
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11 | * documentation and/or other materials provided with the distribution. |
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12 | * 3. All advertising materials mentioning features or use of this software |
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13 | * must display the following acknowledgement: |
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14 | * This product includes software developed by Charles Hannum. |
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15 | * 4. The name of the author may not be used to endorse or promote products |
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16 | * derived from this software without specific prior written permission. |
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17 | * |
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18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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28 | */ |
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29 | |
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30 | /* |
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31 | * Common code for dealing with 3COM ethernet cards. |
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32 | */ |
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33 | |
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34 | #define __INSIDE_RTEMS_BSD_TCPIP_STACK__ |
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35 | |
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36 | #include <sys/types.h> |
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37 | |
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38 | #include "elink.h" |
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39 | |
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40 | #include <bsp.h> |
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41 | |
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42 | static void outb( unsigned short io_addr, unsigned char out_data ) |
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43 | { |
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44 | outport_byte( io_addr, out_data ); |
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45 | } |
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46 | |
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47 | /* |
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48 | * Issue a `global reset' to all cards. We have to be careful to do this only |
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49 | * once during autoconfig, to prevent resetting boards that have already been |
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50 | * configured. |
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51 | */ |
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52 | void |
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53 | elink_reset() |
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54 | { |
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55 | static int x = 0; |
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56 | |
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57 | if (x == 0) { |
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58 | x = 1; |
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59 | outb(ELINK_ID_PORT, ELINK_RESET); |
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60 | } |
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61 | } |
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62 | |
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63 | /* |
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64 | * The `ID sequence' is really just snapshots of an 8-bit CRC register as 0 |
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65 | * bits are shifted in. Different board types use different polynomials. |
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66 | */ |
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67 | void |
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68 | elink_idseq(u_char p) |
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69 | { |
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70 | register int i; |
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71 | register u_char c; |
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72 | |
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73 | c = 0xff; |
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74 | for (i = 255; i; i--) { |
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75 | outb(ELINK_ID_PORT, c); |
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76 | if (c & 0x80) { |
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77 | c <<= 1; |
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78 | c ^= p; |
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79 | } else |
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80 | c <<= 1; |
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81 | } |
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82 | } |
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