1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * 7990.h -- LANCE ethernet IC generic routines. 4 * This is an attempt to separate out the bits of various ethernet 5 * drivers that are common because they all use the AMD 7990 LANCE 6 * (Local Area Network Controller for Ethernet) chip. 7 * 8 * Copyright (C) 05/1998 Peter Maydell <pmaydell@chiark.greenend.org.uk> 9 * 10 * Most of this stuff was obtained by looking at other LANCE drivers, 11 * in particular a2065.[ch]. The AMD C-LANCE datasheet was also helpful. 12 */ 13 14 #ifndef _7990_H 15 #define _7990_H 16 17 /* The lance only has two register locations. We communicate mostly via memory. */ 18 #define LANCE_RDP 0 /* Register Data Port */ 19 #define LANCE_RAP 2 /* Register Address Port */ 20 21 /* Transmit/receive ring definitions. 22 * We allow the specific drivers to override these defaults if they want to. 23 * NB: according to lance.c, increasing the number of buffers is a waste 24 * of space and reduces the chance that an upper layer will be able to 25 * reorder queued Tx packets based on priority. [Clearly there is a minimum 26 * limit too: too small and we drop rx packets and can't tx at full speed.] 27 * 4+4 seems to be the usual setting; the atarilance driver uses 3 and 5. 28 */ 29 30 /* Blast! This won't work. The problem is that we can't specify a default 31 * setting because that would cause the lance_init_block struct to be 32 * too long (and overflow the RAM on shared-memory cards like the HP LANCE. 33 */ 34 #ifndef LANCE_LOG_TX_BUFFERS 35 #define LANCE_LOG_TX_BUFFERS 1 36 #define LANCE_LOG_RX_BUFFERS 3 37 #endif 38 39 #define TX_RING_SIZE (1 << LANCE_LOG_TX_BUFFERS) 40 #define RX_RING_SIZE (1 << LANCE_LOG_RX_BUFFERS) 41 #define TX_RING_MOD_MASK (TX_RING_SIZE - 1) 42 #define RX_RING_MOD_MASK (RX_RING_SIZE - 1) 43 #define TX_RING_LEN_BITS ((LANCE_LOG_TX_BUFFERS) << 29) 44 #define RX_RING_LEN_BITS ((LANCE_LOG_RX_BUFFERS) << 29) 45 #define PKT_BUFF_SIZE (1544) 46 #define RX_BUFF_SIZE PKT_BUFF_SIZE 47 #define TX_BUFF_SIZE PKT_BUFF_SIZE 48 49 /* Each receive buffer is described by a receive message descriptor (RMD) */ 50 struct lance_rx_desc { 51 volatile unsigned short rmd0; /* low address of packet */ 52 volatile unsigned char rmd1_bits; /* descriptor bits */ 53 volatile unsigned char rmd1_hadr; /* high address of packet */ 54 volatile short length; /* This length is 2s complement (negative)! 55 * Buffer length */ 56 volatile unsigned short mblength; /* Actual number of bytes received */ 57 }; 58 59 /* Ditto for TMD: */ 60 struct lance_tx_desc { 61 volatile unsigned short tmd0; /* low address of packet */ 62 volatile unsigned char tmd1_bits; /* descriptor bits */ 63 volatile unsigned char tmd1_hadr; /* high address of packet */ 64 volatile short length; /* Length is 2s complement (negative)! */ 65 volatile unsigned short misc; 66 }; 67 68 /* There are three memory structures accessed by the LANCE: 69 * the initialization block, the receive and transmit descriptor rings, 70 * and the data buffers themselves. In fact we might as well put the 71 * init block,the Tx and Rx rings and the buffers together in memory: 72 */ 73 struct lance_init_block { 74 volatile unsigned short mode; /* Pre-set mode (reg. 15) */ 75 volatile unsigned char phys_addr[6]; /* Physical ethernet address */ 76 volatile unsigned filter[2]; /* Multicast filter (64 bits) */ 77 78 /* Receive and transmit ring base, along with extra bits. */ 79 volatile unsigned short rx_ptr; /* receive descriptor addr */ 80 volatile unsigned short rx_len; /* receive len and high addr */ 81 volatile unsigned short tx_ptr; /* transmit descriptor addr */ 82 volatile unsigned short tx_len; /* transmit len and high addr */ 83 84 /* The Tx and Rx ring entries must be aligned on 8-byte boundaries. 85 * This will be true if this whole struct is 8-byte aligned. 86 */ 87 volatile struct lance_tx_desc btx_ring[TX_RING_SIZE]; 88 volatile struct lance_rx_desc brx_ring[RX_RING_SIZE]; 89 90 volatile char tx_buf[TX_RING_SIZE][TX_BUFF_SIZE]; 91 volatile char rx_buf[RX_RING_SIZE][RX_BUFF_SIZE]; 92 /* we use this just to make the struct big enough that we can move its startaddr 93 * in order to force alignment to an eight byte boundary. 94 */ 95 }; 96 97 /* This is where we keep all the stuff the driver needs to know about. 98 * I'm definitely unhappy about the mechanism for allowing specific 99 * drivers to add things... 100 */ 101 struct lance_private { 102 const char *name; 103 unsigned long base; 104 volatile struct lance_init_block *init_block; /* CPU address of RAM */ 105 volatile struct lance_init_block *lance_init_block; /* LANCE address of RAM */ 106 107 int rx_new, tx_new; 108 int rx_old, tx_old; 109 110 int lance_log_rx_bufs, lance_log_tx_bufs; 111 int rx_ring_mod_mask, tx_ring_mod_mask; 112 113 int tpe; /* TPE is selected */ 114 int auto_select; /* cable-selection is by carrier */ 115 unsigned short busmaster_regval; 116 117 unsigned int irq; /* IRQ to register */ 118 119 /* This is because the HP LANCE is disgusting and you have to check 120 * a DIO-specific register every time you read/write the LANCE regs :-< 121 * [could we get away with making these some sort of macro?] 122 */ 123 void (*writerap)(void *, unsigned short); 124 void (*writerdp)(void *, unsigned short); 125 unsigned short (*readrdp)(void *); 126 spinlock_t devlock; 127 char tx_full; 128 }; 129 130 /* 131 * Am7990 Control and Status Registers 132 */ 133 #define LE_CSR0 0x0000 /* LANCE Controller Status */ 134 #define LE_CSR1 0x0001 /* IADR[15:0] (bit0==0 ie word aligned) */ 135 #define LE_CSR2 0x0002 /* IADR[23:16] (high bits reserved) */ 136 #define LE_CSR3 0x0003 /* Misc */ 137 138 /* 139 * Bit definitions for CSR0 (LANCE Controller Status) 140 */ 141 #define LE_C0_ERR 0x8000 /* Error = BABL | CERR | MISS | MERR */ 142 #define LE_C0_BABL 0x4000 /* Babble: Transmitted too many bits */ 143 #define LE_C0_CERR 0x2000 /* No Heartbeat (10BASE-T) */ 144 #define LE_C0_MISS 0x1000 /* Missed Frame (no rx buffer to put it in) */ 145 #define LE_C0_MERR 0x0800 /* Memory Error */ 146 #define LE_C0_RINT 0x0400 /* Receive Interrupt */ 147 #define LE_C0_TINT 0x0200 /* Transmit Interrupt */ 148 #define LE_C0_IDON 0x0100 /* Initialization Done */ 149 #define LE_C0_INTR 0x0080 /* Interrupt Flag 150 = BABL | MISS | MERR | RINT | TINT | IDON */ 151 #define LE_C0_INEA 0x0040 /* Interrupt Enable */ 152 #define LE_C0_RXON 0x0020 /* Receive On */ 153 #define LE_C0_TXON 0x0010 /* Transmit On */ 154 #define LE_C0_TDMD 0x0008 /* Transmit Demand */ 155 #define LE_C0_STOP 0x0004 /* Stop */ 156 #define LE_C0_STRT 0x0002 /* Start */ 157 #define LE_C0_INIT 0x0001 /* Initialize */ 158 159 160 /* 161 * Bit definitions for CSR3 162 */ 163 #define LE_C3_BSWP 0x0004 /* Byte Swap (on for big endian byte order) */ 164 #define LE_C3_ACON 0x0002 /* ALE Control (on for active low ALE) */ 165 #define LE_C3_BCON 0x0001 /* Byte Control */ 166 167 168 /* 169 * Mode Flags 170 */ 171 #define LE_MO_PROM 0x8000 /* Promiscuous Mode */ 172 /* these next ones 0x4000 -- 0x0080 are not available on the LANCE 7990, 173 * but they are in NetBSD's am7990.h, presumably for backwards-compatible chips 174 */ 175 #define LE_MO_DRCVBC 0x4000 /* disable receive broadcast */ 176 #define LE_MO_DRCVPA 0x2000 /* disable physical address detection */ 177 #define LE_MO_DLNKTST 0x1000 /* disable link status */ 178 #define LE_MO_DAPC 0x0800 /* disable automatic polarity correction */ 179 #define LE_MO_MENDECL 0x0400 /* MENDEC loopback mode */ 180 #define LE_MO_LRTTSEL 0x0200 /* lower RX threshold / TX mode selection */ 181 #define LE_MO_PSEL1 0x0100 /* port selection bit1 */ 182 #define LE_MO_PSEL0 0x0080 /* port selection bit0 */ 183 /* and this one is from the C-LANCE data sheet... */ 184 #define LE_MO_EMBA 0x0080 /* Enable Modified Backoff Algorithm 185 (C-LANCE, not original LANCE) */ 186 #define LE_MO_INTL 0x0040 /* Internal Loopback */ 187 #define LE_MO_DRTY 0x0020 /* Disable Retry */ 188 #define LE_MO_FCOLL 0x0010 /* Force Collision */ 189 #define LE_MO_DXMTFCS 0x0008 /* Disable Transmit CRC */ 190 #define LE_MO_LOOP 0x0004 /* Loopback Enable */ 191 #define LE_MO_DTX 0x0002 /* Disable Transmitter */ 192 #define LE_MO_DRX 0x0001 /* Disable Receiver */ 193 194 195 /* 196 * Receive Flags 197 */ 198 #define LE_R1_OWN 0x80 /* LANCE owns the descriptor */ 199 #define LE_R1_ERR 0x40 /* Error */ 200 #define LE_R1_FRA 0x20 /* Framing Error */ 201 #define LE_R1_OFL 0x10 /* Overflow Error */ 202 #define LE_R1_CRC 0x08 /* CRC Error */ 203 #define LE_R1_BUF 0x04 /* Buffer Error */ 204 #define LE_R1_SOP 0x02 /* Start of Packet */ 205 #define LE_R1_EOP 0x01 /* End of Packet */ 206 #define LE_R1_POK 0x03 /* Packet is complete: SOP + EOP */ 207 208 209 /* 210 * Transmit Flags 211 */ 212 #define LE_T1_OWN 0x80 /* LANCE owns the descriptor */ 213 #define LE_T1_ERR 0x40 /* Error */ 214 #define LE_T1_RES 0x20 /* Reserved, LANCE writes this with a zero */ 215 #define LE_T1_EMORE 0x10 /* More than one retry needed */ 216 #define LE_T1_EONE 0x08 /* One retry needed */ 217 #define LE_T1_EDEF 0x04 /* Deferred */ 218 #define LE_T1_SOP 0x02 /* Start of Packet */ 219 #define LE_T1_EOP 0x01 /* End of Packet */ 220 #define LE_T1_POK 0x03 /* Packet is complete: SOP + EOP */ 221 222 /* 223 * Error Flags 224 */ 225 #define LE_T3_BUF 0x8000 /* Buffer Error */ 226 #define LE_T3_UFL 0x4000 /* Underflow Error */ 227 #define LE_T3_LCOL 0x1000 /* Late Collision */ 228 #define LE_T3_CLOS 0x0800 /* Loss of Carrier */ 229 #define LE_T3_RTY 0x0400 /* Retry Error */ 230 #define LE_T3_TDR 0x03ff /* Time Domain Reflectometry */ 231 232 /* Miscellaneous useful macros */ 233 234 #define TX_BUFFS_AVAIL ((lp->tx_old <= lp->tx_new) ? \ 235 lp->tx_old + lp->tx_ring_mod_mask - lp->tx_new : \ 236 lp->tx_old - lp->tx_new - 1) 237 238 /* The LANCE only uses 24 bit addresses. This does the obvious thing. */ 239 #define LANCE_ADDR(x) ((int)(x) & ~0xff000000) 240 241 /* Now the prototypes we export */ 242 int lance_open(struct net_device *dev); 243 int lance_close(struct net_device *dev); 244 int lance_start_xmit(struct sk_buff *skb, struct net_device *dev); 245 void lance_set_multicast(struct net_device *dev); 246 void lance_tx_timeout(struct net_device *dev, unsigned int txqueue); 247 #ifdef CONFIG_NET_POLL_CONTROLLER 248 void lance_poll(struct net_device *dev); 249 #endif 250 251 #endif /* ndef _7990_H */ 252