/*
wdeth.c

Created:	March 14, 1994 by Philip Homburg
*/

#include "kernel.h"
#include <net/gen/ether.h>
#include <net/gen/eth_io.h>
#include "assert.h"
INIT_ASSERT
#include "dp8390.h"
#include "wdeth.h"

#if ENABLE_NETWORKING

#if !__minix_vmd
#define debug		0
#endif

#define WET_ETHERNET	0x01		/* Ethernet transceiver */
#define WET_STARLAN	0x02		/* Starlan transceiver */
#define WET_INTERF_CHIP	0x04		/* has a WD83C583 interface chip */
#define WET_BRD_16BIT	0x08		/* 16 bit board */
#define WET_SLT_16BIT	0x10		/* 16 bit slot */
#define WET_790		0x20		/* '790 chip */

static int we_int_table[8]= { 9, 3, 5, 7, 10, 11, 15, 4 };
static int we_790int_table[8]= { 0, 9, 3, 5, 7, 10, 11, 15 };

_PROTOTYPE( static void we_init, (dpeth_t *dep)				);
_PROTOTYPE( static void we_stop, (dpeth_t *dep)				);
_PROTOTYPE( static int we_aliasing, (dpeth_t *dep)			);
_PROTOTYPE( static int we_interface_chip, (dpeth_t *dep)		);
_PROTOTYPE( static int we_16bitboard, (dpeth_t *dep)			);
_PROTOTYPE( static int we_16bitslot, (dpeth_t *dep)			);
_PROTOTYPE( static int we_ultra, (dpeth_t *dep)				);

/*===========================================================================*
 *				wdeth_probe				     *
 *===========================================================================*/
int wdeth_probe(dep)
dpeth_t *dep;
{
	int sum;

	if (dep->de_linmem == 0)
		return 0;	/* No shared memory, so no WD board */

	sum = inb_we(dep, EPL_EA0) + inb_we(dep, EPL_EA1) +
		inb_we(dep, EPL_EA2) + inb_we(dep, EPL_EA3) +
		inb_we(dep, EPL_EA4) + inb_we(dep, EPL_EA5) +
		inb_we(dep, EPL_TLB) + inb_we(dep, EPL_CHKSUM);
	if ((sum & 0xFF) != 0xFF)
		return 0;	/* No ethernet board at this address */

	dep->de_initf= we_init;
	dep->de_stopf= we_stop;
	dep->de_prog_IO= 0;
	return 1;
}


/*===========================================================================*
 *				we_init					     *
 *===========================================================================*/
static void we_init(dep)
dpeth_t *dep;
{
	int i, int_indx, int_nr;
	int tlb, rambit, revision;
	int icr, irr, hwr, b, gcr;
	int we_type;
	int sendq_nr;

	assert(dep->de_mode == DEM_ENABLED);
	assert(!(dep->de_flags & DEF_ENABLED));

	dep->de_address.ea_addr[0] = inb_we(dep, EPL_EA0);
	dep->de_address.ea_addr[1] = inb_we(dep, EPL_EA1);
	dep->de_address.ea_addr[2] = inb_we(dep, EPL_EA2);
	dep->de_address.ea_addr[3] = inb_we(dep, EPL_EA3);
	dep->de_address.ea_addr[4] = inb_we(dep, EPL_EA4);
	dep->de_address.ea_addr[5] = inb_we(dep, EPL_EA5);

	dep->de_dp8390_port= dep->de_base_port + EPL_DP8390;

	dep->de_16bit= 0;

	we_type= 0;
	we_type |= WET_ETHERNET;	/* assume ethernet */
	if (we_ultra(dep))
		we_type |= WET_790;
	if (!we_aliasing(dep))
	{
		if (we_interface_chip(dep))
			we_type |= WET_INTERF_CHIP;
		if (we_16bitboard(dep))
		{
			we_type |= WET_BRD_16BIT;
			if (we_16bitslot(dep))
				we_type |= WET_SLT_16BIT;
		}
	}
	if (we_type & WET_SLT_16BIT)
		dep->de_16bit= 1;

	/* look at the on board ram size. */
	tlb= inb_we(dep, EPL_TLB);
	revision= tlb & E_TLB_REV;
	rambit= tlb & E_TLB_RAM;

	if (revision < 2)
	{
		dep->de_ramsize= 0x2000;			/* 8K */
		if (we_type & WET_BRD_16BIT)
			dep->de_ramsize= 0x4000;		/* 16K */
		else if ((we_type & WET_INTERF_CHIP) &&
			inb_we(dep, EPL_ICR) & E_ICR_MEMBIT)
		{
			dep->de_ramsize= 0x8000;		/* 32K */
		}
	}
	else
	{
		if (we_type & WET_BRD_16BIT)
		{
			/* 32K or 16K */
			dep->de_ramsize= rambit ? 0x8000 : 0x4000;
		}
		else
		{
			/* 32K or 8K */
			dep->de_ramsize= rambit ? 0x8000 : 0x2000;
		}
	}

	if (we_type & WET_790)
	{
		outb_we(dep, EPL_MSR, E_MSR_RESET);
		if ((we_type & (WET_BRD_16BIT|WET_SLT_16BIT)) ==
			(WET_BRD_16BIT|WET_SLT_16BIT))
		{
			outb_we(dep, EPL_LAAR, E_LAAR_LAN16E | E_LAAR_MEM16E);
		}
	}
	else if (we_type & WET_BRD_16BIT)
	{
		if (we_type & WET_SLT_16BIT)
		{
			outb_we(dep, EPL_LAAR, E_LAAR_A19 | E_LAAR_SOFTINT |
				E_LAAR_LAN16E | E_LAAR_MEM16E);
		}
		else
		{
			outb_we(dep, EPL_LAAR, E_LAAR_A19 | E_LAAR_SOFTINT |
				E_LAAR_LAN16E);
		}
	}

	if (we_type & WET_790)
	{
		outb_we(dep, EPL_MSR, E_MSR_MENABLE);
		hwr= inb_we(dep, EPL_790_HWR);
		outb_we(dep, EPL_790_HWR, hwr | E_790_HWR_SWH);
		b= inb_we(dep, EPL_790_B);
		outb_we(dep, EPL_790_B, ((dep->de_linmem >> 13) & 0x0f) |
			((dep->de_linmem >> 11) & 0x40) | (b & 0xb0));
		outb_we(dep, EPL_790_HWR, hwr & ~E_790_HWR_SWH);
	}
	else
	{
		outb_we(dep, EPL_MSR, E_MSR_RESET);
		outb_we(dep, EPL_MSR, E_MSR_MENABLE |
			((dep->de_linmem >> 13) & E_MSR_MEMADDR));
	}

	if ((we_type & WET_INTERF_CHIP) && !(we_type & WET_790))
	{
		icr= inb_we(dep, EPL_ICR);
		irr= inb_we(dep, EPL_IRR);
		int_indx= (icr & E_ICR_IR2) |
			((irr & (E_IRR_IR0|E_IRR_IR1)) >> 5);
		int_nr= we_int_table[int_indx];
#if DEBUG
 { printf("wdeth.c: encoded irq= %d\n", int_nr); }
#endif
		if (dep->de_irq & DEI_DEFAULT) dep->de_irq= int_nr;

		outb_we(dep, EPL_IRR, irr | E_IRR_IEN);
	}
	if (we_type & WET_790)
	{
		hwr= inb_we(dep, EPL_790_HWR);
		outb_we(dep, EPL_790_HWR, hwr | E_790_HWR_SWH);

		gcr= inb_we(dep, EPL_790_GCR);

		outb_we(dep, EPL_790_HWR, hwr & ~E_790_HWR_SWH);

		int_indx= ((gcr & E_790_GCR_IR2) >> 4) |
			((gcr & (E_790_GCR_IR1|E_790_GCR_IR0)) >> 2);
		int_nr= we_790int_table[int_indx];
#if DEBUG
 { printf("wdeth.c: encoded irq= %d\n", int_nr); }
#endif
		if (dep->de_irq & DEI_DEFAULT) dep->de_irq= int_nr;

		icr= inb_we(dep, EPL_790_ICR);
		outb_we(dep, EPL_790_ICR, icr | E_790_ICR_EIL);
	}

	/* Strip the "default flag." */
	dep->de_irq &= ~DEI_DEFAULT;

	if (!debug)
	{
		printf("wdeth: WD80%d3 at %X:%d:%lX\n",
			we_type & WET_BRD_16BIT ? 1 : 0,
			dep->de_base_port, dep->de_irq, dep->de_linmem);
	}
	else
	{
		printf("wdeth: Western Digital %s%s card %s%s", 
			we_type & WET_BRD_16BIT ? "16-bit " : "", 
			we_type & WET_ETHERNET ? "Ethernet" : 
			we_type & WET_STARLAN ? "Starlan" : "Network",
			we_type & WET_INTERF_CHIP ? "with an interface chip " : "",
			we_type & WET_SLT_16BIT ? "in a 16-bit slot " : "");
		printf(
	"at I/O address 0x%X, memory address 0x%lX, memory size 0x%X, irq %d\n",
			dep->de_base_port, dep->de_linmem, dep->de_ramsize,
			dep->de_irq);
	}

	dep->de_offset_page= 0;		/* Shared memory starts at 0 */

	/* Allocate one send buffer (1.5KB) per 8KB of on board memory. */
	sendq_nr= dep->de_ramsize / 0x2000;
	if (sendq_nr < 1)
		sendq_nr= 1;
	else if (sendq_nr > SENDQ_NR)
		sendq_nr= SENDQ_NR;
	dep->de_sendq_nr= sendq_nr;
	for (i= 0; i<sendq_nr; i++)
		dep->de_sendq[i].sq_sendpage= i*SENDQ_PAGES;	

	dep->de_startpage= i*SENDQ_PAGES;
	dep->de_stoppage= dep->de_ramsize / DP_PAGESIZE;
}


/*===========================================================================*
 *				we_stop					     *
 *===========================================================================*/
static void we_stop(dep)
dpeth_t *dep;
{
	if (dep->de_16bit)
		outb_we(dep, EPL_LAAR, E_LAAR_A19 | E_LAAR_LAN16E);
	outb_we(dep, EPL_MSR, E_MSR_RESET);
	outb_we(dep, EPL_MSR, 0);
}


/*===========================================================================*
 *				we_aliasing				     *
 *===========================================================================*/
static int we_aliasing(dep)
dpeth_t *dep;
{
/* Determine whether wd8003 hardware performs register aliasing. This implies 
 * an old WD8003E board. */

	if (inb_we(dep, EPL_REG1) != inb_we(dep, EPL_EA1))
		return 0;
	if (inb_we(dep, EPL_REG2) != inb_we(dep, EPL_EA2))
		return 0;
	if (inb_we(dep, EPL_REG3) != inb_we(dep, EPL_EA3))
		return 0;
	if (inb_we(dep, EPL_REG4) != inb_we(dep, EPL_EA4))
		return 0;
	if (inb_we(dep, EPL_REG7) != inb_we(dep, EPL_CHKSUM))
		return 0;
	return 1;
}


/*===========================================================================*
 *				we_interface_chip			     *
 *===========================================================================*/
static int we_interface_chip(dep)
dpeth_t *dep;
{
/* Determine if the board has an interface chip. */

	outb_we(dep, EPL_GP2, 0x35);
	if (inb_we(dep, EPL_GP2) != 0x35)
		return 0;
	outb_we(dep, EPL_GP2, 0x3A);
	if (inb_we(dep, EPL_GP2) != 0x3A)
		return 0;
	return 1;
}


/*===========================================================================*
 *				we_16bitboard				     *
 *===========================================================================*/
static int we_16bitboard(dep)
dpeth_t *dep;
{
/* Determine whether the board is capable of doing 16 bit memory moves.
 * If the 16 bit enable bit is unchangable by software we'll assume an 
 * 8 bit board.
 */
	int icr;
	u8_t tlb;

	icr= inb_we(dep, EPL_ICR);

	outb_we(dep, EPL_ICR, icr ^ E_ICR_16BIT);
	if (inb_we(dep, EPL_ICR) == icr)
	{
		tlb= inb_we(dep, EPL_TLB);
#if DEBUG
		printf("wdeth: tlb= 0x%x\n", tlb);
#endif
		return tlb == E_TLB_EB || tlb == E_TLB_E ||
			tlb == E_TLB_SMCE || tlb == E_TLB_SMC8216C;
	}
	outb_we(dep, EPL_ICR, icr);
	return 1;
}


/*===========================================================================*
 *				we_16bitslot				     *
 *===========================================================================*/
static int we_16bitslot(dep)
dpeth_t *dep;
{
/* Determine if the 16 bit board in plugged into a 16 bit slot.  */
	return !!(inb_we(dep, EPL_ICR) & E_ICR_16BIT);
}


/*===========================================================================*
 *				we_ultra				     *
 *===========================================================================*/
static int we_ultra(dep)
dpeth_t *dep;
{
/* Determine if we has an '790 chip.  */
	u8_t tlb;

	tlb= inb_we(dep, EPL_TLB);
	return tlb == E_TLB_SMC8216C;
}

#endif /* ENABLE_NETWORKING */

/*
 * $PchHeader: /mount/hd2/minix/sys/kernel/ibm/RCS/wdeth.c,v 1.4 1995/01/12 22:03:57 philip Exp $
 */
