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