| 1 | /* |
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| 2 | |
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| 3 | mii.c: MII interface library |
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| 4 | |
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| 5 | Ported to gPXE by Daniel Verkamp <daniel@drv.nu> |
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| 6 | from Linux drivers/net/mii.c |
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| 7 | |
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| 8 | Maintained by Jeff Garzik <jgarzik@pobox.com> |
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| 9 | Copyright 2001,2002 Jeff Garzik |
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| 10 | |
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| 11 | Various code came from myson803.c and other files by |
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| 12 | Donald Becker. Copyright: |
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| 13 | |
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| 14 | Written 1998-2002 by Donald Becker. |
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| 15 | |
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| 16 | This software may be used and distributed according |
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| 17 | to the terms of the GNU General Public License (GPL), |
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| 18 | incorporated herein by reference. Drivers based on |
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| 19 | or derived from this code fall under the GPL and must |
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| 20 | retain the authorship, copyright and license notice. |
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| 21 | This file is not a complete program and may only be |
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| 22 | used when the entire operating system is licensed |
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| 23 | under the GPL. |
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| 24 | |
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| 25 | The author may be reached as becker@scyld.com, or C/O |
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| 26 | Scyld Computing Corporation |
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| 27 | 410 Severn Ave., Suite 210 |
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| 28 | Annapolis MD 21403 |
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| 29 | |
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| 30 | */ |
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| 31 | |
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| 32 | #include <mii.h> |
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| 33 | |
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| 34 | /** |
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| 35 | * mii_link_ok - is link status up/ok |
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| 36 | * @mii: the MII interface |
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| 37 | * |
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| 38 | * Returns 1 if the MII reports link status up/ok, 0 otherwise. |
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| 39 | */ |
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| 40 | int |
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| 41 | mii_link_ok ( struct mii_if_info *mii ) |
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| 42 | { |
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| 43 | /* first, a dummy read, needed to latch some MII phys */ |
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| 44 | mii->mdio_read ( mii->dev, mii->phy_id, MII_BMSR ); |
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| 45 | if ( mii->mdio_read ( mii->dev, mii->phy_id, MII_BMSR ) & BMSR_LSTATUS ) |
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| 46 | return 1; |
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| 47 | return 0; |
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| 48 | } |
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| 49 | |
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| 50 | /** |
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| 51 | * mii_check_link - check MII link status |
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| 52 | * @mii: MII interface |
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| 53 | * |
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| 54 | * If the link status changed (previous != current), call |
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| 55 | * netif_carrier_on() if current link status is Up or call |
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| 56 | * netif_carrier_off() if current link status is Down. |
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| 57 | */ |
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| 58 | void |
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| 59 | mii_check_link ( struct mii_if_info *mii ) |
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| 60 | { |
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| 61 | int cur_link = mii_link_ok ( mii ); |
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| 62 | int prev_link = netdev_link_ok ( mii->dev ); |
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| 63 | |
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| 64 | if ( cur_link && !prev_link ) |
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| 65 | netdev_link_up ( mii->dev ); |
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| 66 | else if (prev_link && !cur_link) |
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| 67 | netdev_link_down ( mii->dev ); |
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| 68 | } |
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| 69 | |
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| 70 | |
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| 71 | /** |
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| 72 | * mii_check_media - check the MII interface for a duplex change |
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| 73 | * @mii: the MII interface |
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| 74 | * @ok_to_print: OK to print link up/down messages |
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| 75 | * @init_media: OK to save duplex mode in @mii |
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| 76 | * |
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| 77 | * Returns 1 if the duplex mode changed, 0 if not. |
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| 78 | * If the media type is forced, always returns 0. |
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| 79 | */ |
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| 80 | unsigned int |
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| 81 | mii_check_media ( struct mii_if_info *mii, |
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| 82 | unsigned int ok_to_print, |
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| 83 | unsigned int init_media ) |
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| 84 | { |
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| 85 | unsigned int old_carrier, new_carrier; |
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| 86 | int advertise, lpa, media, duplex; |
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| 87 | int lpa2 = 0; |
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| 88 | |
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| 89 | /* if forced media, go no further */ |
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| 90 | if (mii->force_media) |
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| 91 | return 0; /* duplex did not change */ |
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| 92 | |
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| 93 | /* check current and old link status */ |
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| 94 | old_carrier = netdev_link_ok ( mii->dev ) ? 1 : 0; |
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| 95 | new_carrier = (unsigned int) mii_link_ok ( mii ); |
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| 96 | |
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| 97 | /* if carrier state did not change, this is a "bounce", |
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| 98 | * just exit as everything is already set correctly |
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| 99 | */ |
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| 100 | if ( ( ! init_media ) && ( old_carrier == new_carrier ) ) |
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| 101 | return 0; /* duplex did not change */ |
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| 102 | |
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| 103 | /* no carrier, nothing much to do */ |
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| 104 | if ( ! new_carrier ) { |
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| 105 | netdev_link_down ( mii->dev ); |
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| 106 | if ( ok_to_print ) |
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| 107 | DBG ( "%s: link down\n", mii->dev->name); |
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| 108 | return 0; /* duplex did not change */ |
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| 109 | } |
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| 110 | |
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| 111 | /* |
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| 112 | * we have carrier, see who's on the other end |
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| 113 | */ |
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| 114 | netdev_link_up ( mii->dev ); |
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| 115 | |
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| 116 | /* get MII advertise and LPA values */ |
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| 117 | if ( ( ! init_media ) && ( mii->advertising ) ) { |
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| 118 | advertise = mii->advertising; |
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| 119 | } else { |
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| 120 | advertise = mii->mdio_read ( mii->dev, mii->phy_id, MII_ADVERTISE ); |
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| 121 | mii->advertising = advertise; |
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| 122 | } |
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| 123 | lpa = mii->mdio_read ( mii->dev, mii->phy_id, MII_LPA ); |
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| 124 | if ( mii->supports_gmii ) |
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| 125 | lpa2 = mii->mdio_read ( mii->dev, mii->phy_id, MII_STAT1000 ); |
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| 126 | |
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| 127 | /* figure out media and duplex from advertise and LPA values */ |
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| 128 | media = mii_nway_result ( lpa & advertise ); |
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| 129 | duplex = ( media & ADVERTISE_FULL ) ? 1 : 0; |
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| 130 | if ( lpa2 & LPA_1000FULL ) |
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| 131 | duplex = 1; |
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| 132 | |
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| 133 | if ( ok_to_print ) |
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| 134 | DBG ( "%s: link up, %sMbps, %s-duplex, lpa 0x%04X\n", |
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| 135 | mii->dev->name, |
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| 136 | lpa2 & ( LPA_1000FULL | LPA_1000HALF ) ? "1000" : |
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| 137 | media & ( ADVERTISE_100FULL | ADVERTISE_100HALF ) ? "100" : "10", |
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| 138 | duplex ? "full" : "half", |
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| 139 | lpa); |
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| 140 | |
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| 141 | if ( ( init_media ) || ( mii->full_duplex != duplex ) ) { |
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| 142 | mii->full_duplex = duplex; |
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| 143 | return 1; /* duplex changed */ |
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| 144 | } |
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| 145 | |
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| 146 | return 0; /* duplex did not change */ |
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| 147 | } |
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