path: root/drivers/net/declance.c

/*     
 *    Lance ethernet driver for the MIPS processor based
 *      DECstation family
 *
 *
 *      adopted from sunlance.c by Richard van den Berg
 *
 *      Copyright (C) 2002, 2003  Maciej W. Rozycki
 *
 *      additional sources:
 *      - PMAD-AA TURBOchannel Ethernet Module Functional Specification,
 *        Revision 1.2
 *
 *      History:
 *
 *      v0.001: The kernel accepts the code and it shows the hardware address.
 *
 *      v0.002: Removed most sparc stuff, left only some module and dma stuff.
 *
 *      v0.003: Enhanced base address calculation from proposals by
 *              Harald Koerfgen and Thomas Riemer.
 *
 *      v0.004: lance-regs is pointing at the right addresses, added prom
 *              check. First start of address mapping and DMA.
 *
 *      v0.005: started to play around with LANCE-DMA. This driver will not
 *              work for non IOASIC lances. HK
 *
 *      v0.006: added pointer arrays to lance_private and setup routine for
 *              them in dec_lance_init. HK
 *
 *      v0.007: Big shit. The LANCE seems to use a different DMA mechanism to
 *              access the init block. This looks like one (short) word at a
 *              time, but the smallest amount the IOASIC can transfer is a
 *              (long) word. So we have a 2-2 padding here. Changed
 *              lance_init_block accordingly. The 16-16 padding for the buffers
 *              seems to be correct. HK
 *
 *      v0.008: mods to make PMAX_LANCE work. 01/09/1999 triemer
 *
 *      v0.009: Module support fixes, multiple interfaces support, various
 *              bits. macro
 */

#include <linux/config.h>
#include <linux/crc32.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/if_ether.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/spinlock.h>
#include <linux/stddef.h>
#include <linux/string.h>

#include <asm/addrspace.h>
#include <asm/dec/interrupts.h>
#include <asm/dec/ioasic.h>
#include <asm/dec/ioasic_addrs.h>
#include <asm/dec/kn01.h>
#include <asm/dec/machtype.h>
#include <asm/dec/tc.h>
#include <asm/system.h>

static char version[] __devinitdata =
"declance.c: v0.009 by Linux MIPS DECstation task force\n";

MODULE_AUTHOR("Linux MIPS DECstation task force");
MODULE_DESCRIPTION("DEC LANCE (DECstation onboard, PMAD-xx) driver");
MODULE_LICENSE("GPL");

/*
 * card types
 */
#define ASIC_LANCE 1
#define PMAD_LANCE 2
#define PMAX_LANCE 3

#ifndef CONFIG_TC
unsigned long system_base;
unsigned long dmaptr;
#endif

#define LE_CSR0 0
#define LE_CSR1 1
#define LE_CSR2 2
#define LE_CSR3 3

#define LE_MO_PROM      0x8000	/* Enable promiscuous mode */

#define	LE_C0_ERR	0x8000	/* Error: set if BAB, SQE, MISS or ME is set */
#define	LE_C0_BABL	0x4000	/* BAB:  Babble: tx timeout. */
#define	LE_C0_CERR	0x2000	/* SQE:  Signal quality error */
#define	LE_C0_MISS	0x1000	/* MISS: Missed a packet */
#define	LE_C0_MERR	0x0800	/* ME:   Memory error */
#define	LE_C0_RINT	0x0400	/* Received interrupt */
#define	LE_C0_TINT	0x0200	/* Transmitter Interrupt */
#define	LE_C0_IDON	0x0100	/* IFIN: Init finished. */
#define	LE_C0_INTR	0x0080	/* Interrupt or error */
#define	LE_C0_INEA	0x0040	/* Interrupt enable */
#define	LE_C0_RXON	0x0020	/* Receiver on */
#define	LE_C0_TXON	0x0010	/* Transmitter on */
#define	LE_C0_TDMD	0x0008	/* Transmitter demand */
#define	LE_C0_STOP	0x0004	/* Stop the card */
#define	LE_C0_STRT	0x0002	/* Start the card */
#define	LE_C0_INIT	0x0001	/* Init the card */

#define	LE_C3_BSWP	0x4	/* SWAP */
#define	LE_C3_ACON	0x2	/* ALE Control */
#define	LE_C3_BCON	0x1	/* Byte control */

/* Receive message descriptor 1 */
#define LE_R1_OWN       0x80	/* Who owns the entry */
#define LE_R1_ERR       0x40	/* Error: if FRA, OFL, CRC or BUF is set */
#define LE_R1_FRA       0x20	/* FRA: Frame error */
#define LE_R1_OFL       0x10	/* OFL: Frame overflow */
#define LE_R1_CRC       0x08	/* CRC error */
#define LE_R1_BUF       0x04	/* BUF: 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 */

#define LE_T1_OWN       0x80	/* Lance owns the packet */
#define LE_T1_ERR       0x40	/* Error summary */
#define LE_T1_EMORE     0x10	/* Error: more than one retry needed */
#define LE_T1_EONE      0x08	/* Error: one retry needed */
#define LE_T1_EDEF      0x04	/* Error: 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 */

#define LE_T3_BUF       0x8000	/* Buffer error */
#define LE_T3_UFL       0x4000	/* Error underflow */
#define LE_T3_LCOL      0x1000	/* Error late collision */
#define LE_T3_CLOS      0x0800	/* Error carrier loss */
#define LE_T3_RTY       0x0400	/* Error retry */
#define LE_T3_TDR       0x03ff	/* Time Domain Reflectometry counter */

/* Define: 2^4 Tx buffers and 2^4 Rx buffers */

#ifndef LANCE_LOG_TX_BUFFERS
#define LANCE_LOG_TX_BUFFERS 4
#define LANCE_LOG_RX_BUFFERS 4
#endif

#define TX_RING_SIZE			(1 << (LANCE_LOG_TX_BUFFERS))
#define