atarilance.c

powerpc内核mpc8241linux系统下net驱动程序

/* atarilance.c: Ethernet driver for VME Lance cards on the Atari */
/*
	Written 1995/96 by Roman Hodek ([e-mail])

	This software may be used and distributed according to the terms
	of the GNU Public License, incorporated herein by reference.

	This drivers was written with the following sources of reference:
	 - The driver for the Riebl Lance card by the TU Vienna.
	 - The modified TUW driver for PAM's VME cards
	 - The PC-Linux driver for Lance cards (but this is for bus master
       cards, not the shared memory ones)
	 - The Amiga Ariadne driver

	v1.0: (in 1.2.13pl4/0.9.13)
	      Initial version
	v1.1: (in 1.2.13pl5)
	      more comments
		  deleted some debugging stuff
		  optimized register access (keep AREG pointing to CSR0)
		  following AMD, CSR0_STRT should be set only after IDON is detected
		  use memcpy() for data transfers, that also employs long word moves
		  better probe procedure for 24-bit systems
          non-VME-RieblCards need extra delays in memcpy
		  must also do write test, since 0xfxe00000 may hit ROM
		  use 8/32 tx/rx buffers, which should give better NFS performance;
		    this is made possible by shifting the last packet buffer after the
		    RieblCard reserved area
    v1.2: (in 1.2.13pl8)
	      again fixed probing for the Falcon; 0xfe01000 hits phys. 0x00010000
		  and thus RAM, in case of no Lance found all memory contents have to
		  be restored!
		  Now possible to compile as module.
	v1.3: 03/30/96 Jes Sorensen, Roman (in 1.3)
	      Several little 1.3 adaptions
		  When the lance is stopped it jumps back into little-endian
		  mode. It is therefore necessary to put it back where it
		  belongs, in big endian mode, in order to make things work.
		  This might be the reason why multicast-mode didn't work
		  before, but I'm not able to test it as I only got an Amiga
		  (we had similar problems with the A2065 driver).

*/

static char *version = "atarilance.c: v1.3 04/04/96 "
					   "[e-mail]\n";

#include <linux/module.h>

#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/ptrace.h>
#include <linux/errno.h>
#include <linux/malloc.h>
#include <linux/interrupt.h>
#include <linux/init.h>

#include <asm/setup.h>
#include <asm/irq.h>
#include <asm/atarihw.h>
#include <asm/atariints.h>
#include <asm/bitops.h>
#include <asm/io.h>

#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>

/* Debug level:
 *  0 = silent, print only serious errors
 *  1 = normal, print error messages
 *  2 = debug, print debug infos
 *  3 = debug, print even more debug infos (packet data)
 */

#define	LANCE_DEBUG	1

#ifdef LANCE_DEBUG
static int lance_debug = LANCE_DEBUG;
#else
static int lance_debug = 1;
#endif
MODULE_PARM(lance_debug, "i");

/* Print debug messages on probing? */
#undef LANCE_DEBUG_PROBE

#define	DPRINTK(n,a)							\
	do {										\
		if (lance_debug >= n)					\
			printk a;							\
	} while( 0 )

#ifdef LANCE_DEBUG_PROBE
# define PROBE_PRINT(a)	printk a
#else
# define PROBE_PRINT(a)
#endif

/* These define the number of Rx and Tx buffers as log2. (Only powers
 * of two are valid)
 * Much more rx buffers (32) are reserved than tx buffers (8), since receiving
 * is more time critical then sending and packets may have to remain in the
 * board's memory when main memory is low.
 */

#define TX_LOG_RING_SIZE			3
#define RX_LOG_RING_SIZE			5

/* These are the derived values */

#define TX_RING_SIZE			(1 << TX_LOG_RING_SIZE)
#define TX_RING_LEN_BITS		(TX_LOG_RING_SIZE << 5)
#define	TX_RING_MOD_MASK		(TX_RING_SIZE - 1)

#define RX_RING_SIZE			(1 << RX_LOG_RING_SIZE)
#define RX_RING_LEN_BITS		(RX_LOG_RING_SIZE << 5)
#define	RX_RING_MOD_MASK		(RX_RING_SIZE - 1)

/* The LANCE Rx and Tx ring descriptors. */
struct lance_rx_head {
	unsigned short			base;		/* Low word of base addr */
	volatile unsigned char	flag;
	unsigned char			base_hi;	/* High word of base addr (unused) */
	short					buf_length;	/* This length is 2s complement! */
	volatile short			msg_length;	/* This length is "normal". */
};

struct lance_tx_head {
	unsigned short			base;		/* Low word of base addr */
	volatile unsigned char	flag;
	unsigned char			base_hi;	/* High word of base addr (unused) */
	short					length;		/* Length is 2s complement! */
	volatile short			misc;
};

struct ringdesc {
	unsigned short	adr_lo;		/* Low 16 bits of address */
	unsigned char	len;		/* Length bits */
	unsigned char	adr_hi;		/* High 8 bits of address (unused) */
};

/* The LANCE initialization block, described in databook. */
struct lance_init_block {
	unsigned short	mode;		/* Pre-set mode */
	unsigned char	hwaddr[6];	/* Physical ethernet address */
	unsigned		filter[2];	/* Multicast filter (unused). */
	/* Receive and transmit ring base, along with length bits. */
	struct ringdesc	rx_ring;
	struct ringdesc	tx_ring;
};

/* The whole layout of the Lance shared memory */
struct lance_memory {
	struct lance_init_block	init;
	struct lance_tx_head	tx_head[TX_RING_SIZE];
	struct lance_rx_head	rx_head[RX_RING_SIZE];
	char					packet_area[0];	/* packet data follow after the
											 * init block and the ring
											 * descriptors and are located
											 * at runtime */
};

/* RieblCard specifics:
 * The original TOS driver for these cards reserves the area from offset
 * 0xee70 to 0xeebb for storing configuration data. Of interest to us is the
 * Ethernet address there, and the magic for verifying the data's validity.
 * The reserved area isn't touch by packet buffers. Furthermore, offset 0xfffe
 * is reserved for the interrupt vector number.
 */
#define	RIEBL_RSVD_START	0xee70
#define	RIEBL_RSVD_END		0xeec0
#define RIEBL_MAGIC			0x09051990
#define RIEBL_MAGIC_ADDR	((unsigned long *)(((char *)MEM) + 0xee8a))
#define RIEBL_HWADDR_ADDR	((unsigned char *)(((char *)MEM) + 0xee8e))
#define RIEBL_IVEC_ADDR		((unsigned short *)(((char *)MEM) + 0xfffe))

/* This is a default address for the old RieblCards without a battery
 * that have no ethernet address at boot time. 00:00:36:04 is the
 * prefix for Riebl cards, the 00:00 at the end is arbitrary.
 */

static unsigned char OldRieblDefHwaddr[6] = {
	0x00, 0x00, 0x36, 0x04, 0x00, 0x00
};


/* I/O registers of the Lance chip */

struct lance_ioreg {
/* base+0x0 */	volatile unsigned short	data;
/* base+0x2 */	volatile unsigned short	addr;
				unsigned char			_dummy1[3];
/* base+0x7 */	volatile unsigned char	ivec;
				unsigned char			_dummy2[5];
/* base+0xd */	volatile unsigned char	eeprom;
				unsigned char			_dummy3;
/* base+0xf */	volatile unsigned char	mem;
};

/* Types of boards this driver supports */

enum lance_type {
	OLD_RIEBL,		/* old Riebl card without battery */
	NEW_RIEBL,		/* new Riebl card with battery */
	PAM_CARD		/* PAM card with EEPROM */
};

static char *lance_names[] = {
	"Riebl-Card (without battery)",
	"Riebl-Card (with battery)",
	"PAM intern card"
};

/* The driver's private device structure */

struct lance_private {
	enum lance_type		cardtype;
	struct lance_ioreg	*iobase;
	struct lance_memory	*mem;
	int					cur_rx, cur_tx;	/* The next free ring entry */
	int					dirty_tx;		/* Ring entries to be freed. */
						/* copy function */
	void				*(*memcpy_f)( void *, const void *, size_t );
	struct net_device_stats stats;
/* These two must be ints for set_bit() */
	int					tx_full;
	int					lock;
};

/* I/O register access macros */

#define	MEM		lp->mem
#define	DREG	IO->data
#define	AREG	IO->addr
#define	REGA(a)	( AREG = (a), DREG )

/* Definitions for packet buffer access: */
#define PKT_BUF_SZ		1544
/* Get the address of a packet buffer corresponding to a given buffer head */
#define	PKTBUF_ADDR(head)	(((unsigned char *)(MEM)) + (head)->base)

/* Possible memory/IO addresses for probing */

struct lance_addr {
	unsigned long	memaddr;
	unsigned long	ioaddr;
	int				slow_flag;
} lance_addr_list[] = {
	{ 0xfe010000, 0xfe00fff0, 0 },	/* RieblCard VME in TT */
	{ 0xffc10000, 0xffc0fff0, 0 },	/* RieblCard VME in MegaSTE
									   (highest byte stripped) */
	{ 0xffe00000, 0xffff7000, 1 },	/* RieblCard in ST
									   (highest byte stripped) */
	{ 0xffd00000, 0xffff7000, 1 },	/* RieblCard in ST with hw modif. to
									   avoid conflict with ROM
									   (highest byte stripped) */
	{ 0xffcf0000, 0xffcffff0, 0 },	/* PAMCard VME in TT and MSTE
									   (highest byte stripped) */
	{ 0xfecf0000, 0xfecffff0, 0 },	/* Rhotron's PAMCard VME in TT and MSTE
									   (highest byte stripped) */
};

#define	N_LANCE_ADDR	(sizeof(lance_addr_list)/sizeof(*lance_addr_list))


/* Definitions for the Lance */

/* tx_head flags */
#define TMD1_ENP		0x01	/* end of packet */
#define TMD1_STP		0x02	/* start of packet */
#define TMD1_DEF		0x04	/* deferred */
#define TMD1_ONE		0x08	/* one retry needed */
#define TMD1_MORE		0x10	/* more than one retry needed */
#define TMD1_ERR		0x40	/* error summary */
#define TMD1_OWN 		0x80	/* ownership (set: chip owns) */

#define TMD1_OWN_CHIP	TMD1_OWN
#define TMD1_OWN_HOST	0

/* tx_head misc field */
#define TMD3_TDR		0x03FF	/* Time Domain Reflectometry counter */
#define TMD3_RTRY		0x0400	/* failed after 16 retries */
#define TMD3_LCAR		0x0800	/* carrier lost */
#define TMD3_LCOL		0x1000	/* late collision */
#define TMD3_UFLO		0x4000	/* underflow (late memory) */
#define TMD3_BUFF		0x8000	/* buffering error (no ENP) */

/* rx_head flags */
#define RMD1_ENP		0x01	/* end of packet */
#define RMD1_STP		0x02	/* start of packet */
#define RMD1_BUFF		0x04	/* buffer error */
#define RMD1_CRC		0x08	/* CRC error */
#define RMD1_OFLO		0x10	/* overflow */
#define RMD1_FRAM		0x20	/* framing error */
#define RMD1_ERR		0x40	/* error summary */
#define RMD1_OWN 		0x80	/* ownership (set: ship owns) */

#define RMD1_OWN_CHIP	RMD1_OWN
#define RMD1_OWN_HOST	0

/* register names */
#define CSR0	0		/* mode/status */
#define CSR1	1		/* init block addr (low) */
#define CSR2	2		/* init block addr (high) */
#define CSR3	3		/* misc */
#define CSR8	8	  	/* address filter */
#define CSR15	15		/* promiscuous mode */

/* CSR0 */
/* (R=readable, W=writeable, S=set on write, C=clear on write) */
#define CSR0_INIT	0x0001		/* initialize (RS) */
#define CSR0_STRT	0x0002		/* start (RS) */
#define CSR0_STOP	0x0004		/* stop (RS) */
#define CSR0_TDMD	0x0008		/* transmit demand (RS) */
#define CSR0_TXON	0x0010		/* transmitter on (R) */
#define CSR0_RXON	0x0020		/* receiver on (R) */
#define CSR0_INEA	0x0040		/* interrupt enable (RW) */
#define CSR0_INTR	0x0080		/* interrupt active (R) */
#define CSR0_IDON	0x0100		/* initialization done (RC) */
#define CSR0_TINT	0x0200		/* transmitter interrupt (RC) */
#define CSR0_RINT	0x0400		/* receiver interrupt (RC) */
#define CSR0_MERR	0x0800		/* memory error (RC) */
#define CSR0_MISS	0x1000		/* missed frame (RC) */
#define CSR0_CERR	0x2000		/* carrier error (no heartbeat :-) (RC) */
#define CSR0_BABL	0x4000		/* babble: tx-ed too many bits (RC) */
#define CSR0_ERR	0x8000		/* error (RC) */

/* CSR3 */
#define CSR3_BCON	0x0001		/* byte control */
#define CSR3_ACON	0x0002		/* ALE control */
#define CSR3_BSWP	0x0004		/* byte swap (1=big endian) */



/***************************** Prototypes *****************************/

static int addr_accessible( volatile void *regp, int wordflag, int
                            writeflag );
static unsigned long lance_probe1( struct device *dev, struct lance_addr
                                   *init_rec );
static int lance_open( struct device *dev );
static void lance_init_ring( struct device *dev );
static int lance_start_xmit( struct sk_buff *skb, struct device *dev );
static void lance_interrupt( int irq, void *dev_id, struct pt_regs *fp );
static int lance_rx( struct device *dev );
static int lance_close( struct device *dev );
static struct net_device_stats *lance_get_stats( struct device *dev );
static void set_multicast_list( struct device *dev );
static int lance_set_mac_address( struct device *dev, void *addr );

/************************* End of Prototypes **************************/





void *slow_memcpy( void *dst, const void *src, size_t len )

{	char *cto = dst;
	const char *cfrom = src;

	while( len-- ) {
		*cto++ = *cfrom++;
		MFPDELAY();
	}
	return( dst );
}


__initfunc(int atarilance_probe( struct device *dev ))

{	int i;
	static int found = 0;

	if (!MACH_IS_ATARI || found)
		/* Assume there's only one board possible... That seems true, since
		 * the Riebl/PAM board's address cannot be changed. */
		return( ENODEV );

	for( i = 0; i < N_LANCE_ADDR; ++i ) {
		if (lance_probe1( dev, &lance_addr_list[i] )) {
			found = 1;
			return( 0 );
		}
	}

	return( ENODEV );
}


/* Derived from hwreg_present() in atari/config.c: */

__initfunc(static int addr_accessible( volatile void *regp, int wordflag, int writeflag ))

{	int		ret;