1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
|
/*
* 7990.h -- LANCE ethernet IC generic routines.
* This is an attempt to separate out the bits of various ethernet
* drivers that are common because they all use the AMD 7990 LANCE
* (Local Area Network Controller for Ethernet) chip.
*
* Copyright (C) 05/1998 Peter Maydell <pmaydell@chiark.greenend.org.uk>
*
* Most of this stuff was obtained by looking at other LANCE drivers,
* in particular a2065.[ch]. The AMD C-LANCE datasheet was also helpful.
*/
#ifndef _7990_H
#define _7990_H
/* The lance only has two register locations. We communicate mostly via memory. */
#define LANCE_RDP 0 /* Register Data Port */
#define LANCE_RAP 2 /* Register Address Port */
/* Transmit/receive ring definitions.
* We allow the specific drivers to override these defaults if they want to.
* NB: according to lance.c, increasing the number of buffers is a waste
* of space and reduces the chance that an upper layer will be able to
* reorder queued Tx packets based on priority. [Clearly there is a minimum
* limit too: too small and we drop rx packets and can't tx at full speed.]
* 4+4 seems to be the usual setting; the atarilance driver uses 3 and 5.
*/
/* Blast! This won't work. The problem is that we can't specify a default
* setting because that would cause the lance_init_block struct to be
* too long (and overflow the RAM on shared-memory cards like the HP LANCE.
*/
#ifndef LANCE_LOG_TX_BUFFERS
#define LANCE_LOG_TX_BUFFERS 1
#define LANCE_LOG_RX_BUFFERS 3
#endif
#define TX_RING_SIZE (1<<LANCE_LOG_TX_BUFFERS)
#define RX_RING_SIZE (1<<LANCE_LOG_RX_BUFFERS)
#define TX_RING_MOD_MASK (TX_RING_SIZE - 1)
#define RX_RING_MOD_MASK (RX_RING_SIZE - 1)
#define TX_RING_LEN_BITS ((LANCE_LOG_TX_BUFFERS) << 29)
#define RX_RING_LEN_BITS ((LANCE_LOG_RX_BUFFERS) << 29)
#define PKT_BUFF_SIZE (1544)
#define RX_BUFF_SIZE PKT_BUFF_SIZE
#define TX_BUFF_SIZE PKT_BUFF_SIZE
/* Each receive buffer is described by a receive message descriptor (RMD) */
struct lance_rx_desc {
volatile unsigned short rmd0; /* low address of packet */
volatile unsigned char rmd1_bits; /* descriptor bits */
volatile unsigned char rmd1_hadr; /* high address of packet */
volatile short length; /* This length is 2s complement (negative)!
* Buffer length
*/
volatile unsigned short mblength; /* Actual number of bytes received */
};
/* Ditto for TMD: */
struct lance_tx_desc {
volatile unsigned short tmd0; /* low address of packet */
volatile unsigned char tmd1_bits; /* descriptor bits */
volatile unsigned char tmd1_hadr; /* high address of packet */
volatile short length; /* Length is 2s complement (negative)! */
volatile unsigned short misc;
};
/* There are three memory structures accessed by the LANCE:
* the initialization block, the receive and transmit descriptor rings,
* and the data buffers themselves. In fact we might as well put the
* init block,the Tx and Rx rings and the buffers together in memory:
*/
struct lance_init_block {
volatile unsigned short mode; /* Pre-set mode (reg. 15) */
volatile unsigned char phys_addr[6]; /* Physical ethernet address */
volatile unsigned filter[2]; /* Multicast filter (64 bits) */
/* Receive and transmit ring base, along with extra bits. */
volatile unsigned short rx_ptr; /* receive descriptor addr */
volatile unsigned short rx_len; /* receive len and high addr */
volatile unsigned short tx_ptr; /* transmit descriptor addr */
volatile unsigned short tx_len; /* transmit len and high addr */
/* The Tx and Rx ring entries must be aligned on 8-byte boundaries.
* This will be true if this whole struct is 8-byte aligned.
*/
volatile struct lance_tx_desc btx_ring[TX_RING_SIZE];
volatile struct lance_rx_desc brx_ring[RX_RING_SIZE];
volatile char tx_buf [TX_RING_SIZE][TX_BUFF_SIZE];
volatile char rx_buf [RX_RING_SIZE][RX_BUFF_SIZE];
/* we use this just to make the struct big enough that we can move its startaddr
* in order to force alignment to an eight byte boundary.
*/
};
/* This is where we keep all the stuff the driver needs to know about.
* I'm definitely unhappy about the mechanism for allowing specific
* drivers to add things...
*/
struct lance_private
{
char *name;
unsigned long base;
volatile struct lance_init_block *init_block; /* CPU address of RAM */
volatile struct lance_init_block *lance_init_block; /* LANCE address of RAM */
int rx_new, tx_new;
int rx_old, tx_old;
int lance_log_rx_bufs, lance_log_tx_bufs;
int rx_ring_mod_mask, tx_ring_mod_mask;
int tpe; /* TPE is selected */
int auto_select; /* cable-selection is by carrier */
unsigned short busmaster_regval;
unsigned int irq; /* IRQ to register */
/* This is because the HP LANCE is disgusting and you have to check
* a DIO-specific register every time you read/write the LANCE regs :-<
* [could we get away with making these some sort of macro?]
*/
void (*writerap)(void *, unsigned short);
void (*writerdp)(void *, unsigned short);
unsigned short (*readrdp)(void *);
spinlock_t devlock;
char tx_full;
};
/*
* Am7990 Control and Status Registers
*/
#define LE_CSR0 0x0000 /* LANCE Controller Status */
#define LE_CSR1 0x0001 /* IADR[15:0] (bit0==0 ie word aligned) */
#define LE_CSR2 0x0002 /* IADR[23:16] (high bits reserved) */
#define LE_CSR3 0x0003 /* Misc */
/*
* Bit definitions for CSR0 (LANCE Controller Status)
*/
#define LE_C0_ERR 0x8000 /* Error = BABL | CERR | MISS | MERR */
#define LE_C0_BABL 0x4000 /* Babble: Transmitted too many bits */
#define LE_C0_CERR 0x2000 /* No Heartbeat (10BASE-T) */
#define LE_C0_MISS 0x1000 /* Missed Frame (no rx buffer to put it in) */
#define LE_C0_MERR 0x0800 /* Memory Error */
#define LE_C0_RINT 0x0400 /* Receive Interrupt */
#define LE_C0_TINT 0x0200 /* Transmit Interrupt */
#define LE_C0_IDON 0x0100 /* Initialization Done */
#define LE_C0_INTR 0x0080 /* Interrupt Flag
= BABL | MISS | MERR | RINT | TINT | IDON */
#define LE_C0_INEA 0x0040 /* Interrupt Enable */
#define LE_C0_RXON 0x0020 /* Receive On */
#define LE_C0_TXON 0x0010 /* Transmit On */
#define LE_C0_TDMD 0x0008 /* Transmit Demand */
#define LE_C0_STOP 0x0004 /* Stop */
#define LE_C0_STRT 0x0002 /* Start */
#define LE_C0_INIT 0x0001 /* Initialize */
/*
* Bit definitions for CSR3
*/
#define LE_C3_BSWP 0x0004 /* Byte Swap
(on for big endian byte order) */
#define LE_C3_ACON 0x0002 /* ALE Control
(on for active low ALE) */
#define LE_C3_BCON 0x0001 /* Byte Control */
/*
* Mode Flags
*/
#define LE_MO_PROM 0x8000 /* Promiscuous Mode */
/* these next ones 0x4000 -- 0x0080 are not available on the LANCE 7990,
* but they are in NetBSD's am7990.h, presumably for backwards-compatible chips
*/
#define LE_MO_DRCVBC 0x4000 /* disable receive broadcast */
#define LE_MO_DRCVPA 0x2000 /* disable physical address detection */
#define LE_MO_DLNKTST 0x1000 /* disable link status */
#define LE_MO_DAPC 0x0800 /* disable automatic polarity correction */
#define LE_MO_MENDECL 0x0400 /* MENDEC loopback mode */
#define LE_MO_LRTTSEL 0x0200 /* lower RX threshold / TX mode selection */
#define LE_MO_PSEL1 0x0100 /* port selection bit1 */
#define LE_MO_PSEL0 0x0080 /* port selection bit0 */
/* and this one is from the C-LANCE data sheet... */
#define LE_MO_EMBA 0x0080 /* Enable Modified Backoff Algorithm
(C-LANCE, not original LANCE) */
#define LE_MO_INTL 0x0040 /* Internal Loopback */
#define LE_MO_DRTY 0x0020 /* Disable Retry */
#define LE_MO_FCOLL 0x0010 /* Force Collision */
#define LE_MO_DXMTFCS 0x0008 /* Disable Transmit CRC */
#define LE_MO_LOOP 0x0004 /* Loopback Enable */
#define LE_MO_DTX 0x0002 /* Disable Transmitter */
#define LE_MO_DRX 0x0001 /* Disable Receiver */
/*
* Receive Flags
*/
#define LE_R1_OWN 0x80 /* LANCE owns the descriptor */
#define LE_R1_ERR 0x40 /* Error */
#define LE_R1_FRA 0x20 /* Framing Error */
#define LE_R1_OFL 0x10 /* Overflow Error */
#define LE_R1_CRC 0x08 /* CRC Error */
#define LE_R1_BUF 0x04 /* Buffer Error */
#define LE_R1_SOP 0x02 /* Start of Packet */
#define LE_R1_EOP 0x01 /* End of Packet */
#define LE_R1_POK 0x03 /* Packet is complete: SOP + EOP */
/*
* Transmit Flags
*/
#define LE_T1_OWN 0x80 /* LANCE owns the descriptor */
#define LE_T1_ERR 0x40 /* Error */
#define LE_T1_RES 0x20 /* Reserved, LANCE writes this with a zero */
#define LE_T1_EMORE 0x10 /* More than one retry needed */
#define LE_T1_EONE 0x08 /* One retry needed */
#define LE_T1_EDEF 0x04 /* Deferred */
#define LE_T1_SOP 0x02 /* Start of Packet */
#define LE_T1_EOP 0x01 /* End of Packet */
#define LE_T1_POK 0x03 /* Packet is complete: SOP + EOP */
/*
* Error Flags
*/
#define LE_T3_BUF 0x8000 /* Buffer Error */
#define LE_T3_UFL 0x4000 /* Underflow Error */
#define LE_T3_LCOL 0x1000 /* Late Collision */
#define LE_T3_CLOS 0x0800 /* Loss of Carrier */
#define LE_T3_RTY 0x0400 /* Retry Error */
#define LE_T3_TDR 0x03ff /* Time Domain Reflectometry */
/* Miscellaneous useful macros */
#define TX_BUFFS_AVAIL ((lp->tx_old<=lp->tx_new)?\
lp->tx_old+lp->tx_ring_mod_mask-lp->tx_new:\
lp->tx_old - lp->tx_new-1)
/* The LANCE only uses 24 bit addresses. This does the obvious thing. */
#define LANCE_ADDR(x) ((int)(x) & ~0xff000000)
/* Now the prototypes we export */
extern int lance_open(struct net_device *dev);
extern int lance_close (struct net_device *dev);
extern int lance_start_xmit (struct sk_buff *skb, struct net_device *dev);
extern void lance_set_multicast (struct net_device *dev);
extern void lance_tx_timeout(struct net_device *dev);
#ifdef CONFIG_NET_POLL_CONTROLLER
extern void lance_poll(struct net_device *dev);
#endif
#endif /* ndef _7990_H */
|
