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7990.h
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7990.h
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/*
* 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 */