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/*

 * ni6510 (am7990 'lance' chip) driver for Linux-net-3

 * BETAcode v0.71 (96/09/29) for 2.0.0 (or later)

 * copyrights (c) 1994,1995,1996 by M.Hipp

 *

 * This driver can handle the old ni6510 board and the newer ni6510

 * EtherBlaster. (probably it also works with every full NE2100

 * compatible card)

 *

 * To compile as module, type:

 *     gcc -O2 -fomit-frame-pointer -m486 -D__KERNEL__ -DMODULE -c ni65.c

 * driver probes: io: 0x360,0x300,0x320,0x340 / dma: 3,5,6,7

 *

 * This is an extension to the Linux operating system, and is covered by the

 * same GNU General Public License that covers the Linux-kernel.

 *

 * comments/bugs/suggestions can be sent to:

 *   Michael Hipp

 *   email: hippm@informatik.uni-tuebingen.de

 *

 * sources:

 *   some things are from the 'ni6510-packet-driver for dos by Russ Nelson'

 *   and from the original drivers by D.Becker

 *

 * known problems:

 *   - on some PCI boards (including my own) the card/board/ISA-bridge has

 *     problems with bus master DMA. This results in lotsa overruns.

 *     It may help to '#define RCV_PARANOIA_CHECK' or try to #undef

 *     the XMT and RCV_VIA_SKB option .. this reduces driver performance.

 *     Or just play with your BIOS options to optimize ISA-DMA access.

 *     Maybe you also wanna play with the LOW_PERFORAMCE and MID_PERFORMANCE

 *     defines -> please report me your experience then

 *   - Harald reported for ASUS SP3G mainboards, that you should use

 *     the 'optimal settings' from the user's manual on page 3-12!

 *

 * credits:

 *   thanx to Jason Sullivan for sending me a ni6510 card!

 *   lot of debug runs with ASUS SP3G Boards (Intel Saturn) by Harald Koenig

 *

 * simple performance test: (486DX-33/Ni6510-EB receives from 486DX4-100/Ni6510-EB)

 *    average: FTP -> 8384421 bytes received in 8.5 seconds

 *           (no RCV_VIA_SKB,no XMT_VIA_SKB,PARANOIA_CHECK,4 XMIT BUFS, 8 RCV_BUFFS)

 *    peak: FTP -> 8384421 bytes received in 7.5 seconds

 *           (RCV_VIA_SKB,XMT_VIA_SKB,no PARANOIA_CHECK,1(!) XMIT BUF, 16 RCV BUFFS)

 */

/*

 * 99.Jun.8: added support for /proc/net/dev byte count for xosview (HK)

 * 96.Sept.29: virt_to_bus stuff added for new memory modell

 * 96.April.29: Added Harald Koenig's Patches (MH)

 * 96.April.13: enhanced error handling .. more tests (MH)

 * 96.April.5/6: a lot of performance tests. Got it stable now (hopefully) (MH)

 * 96.April.1: (no joke ;) .. added EtherBlaster and Module support (MH)

 * 96.Feb.19: fixed a few bugs .. cleanups .. tested for 1.3.66 (MH)

 *            hopefully no more 16MB limit

 *

 * 95.Nov.18: multicast tweaked (AC).

 *

 * 94.Aug.22: changes in xmit_intr (ack more than one xmitted-packet), ni65_send_packet (p->lock) (MH)

 *

 * 94.July.16: fixed bugs in recv_skb and skb-alloc stuff  (MH)

 */

#include <linux/kernel.h>

#include <linux/string.h>

#include <linux/errno.h>

#include <linux/ioport.h>

#include <linux/slab.h>

#include <linux/interrupt.h>

#include <linux/delay.h>

#include <linux/init.h>

#include <linux/netdevice.h>

#include <linux/etherdevice.h>

#include <linux/skbuff.h>

#include <linux/module.h>

#include <linux/bitops.h>

#include <asm/io.h>

#include <asm/dma.h>

#include "ni65.h"

/*

 * the current setting allows an acceptable performance

 * for 'RCV_PARANOIA_CHECK' read the 'known problems' part in

 * the header of this file

 * 'invert' the defines for max. performance. This may cause DMA problems

 * on some boards (e.g on my ASUS SP3G)

 */

#undef XMT_VIA_SKB

#undef RCV_VIA_SKB

#define RCV_PARANOIA_CHECK

#define MID_PERFORMANCE

#if   defined( LOW_PERFORMANCE )

 static int isa0=7,isa1=7,csr80=0x0c10;

#elif defined( MID_PERFORMANCE )

 static int isa0=5,isa1=5,csr80=0x2810;

#else   /* high performance */

 static int isa0=4,isa1=4,csr80=0x0017;

#endif

/*

 * a few card/vendor specific defines

 */

#define NI65_ID0    0x00

#define NI65_ID1    0x55

#define NI65_EB_ID0 0x52

#define NI65_EB_ID1 0x44

#define NE2100_ID0  0x57

#define NE2100_ID1  0x57

#define PORT p->cmdr_addr

/*

 * buffer configuration

 */

#if 1

#define RMDNUM 16

#define RMDNUMMASK 0x80000000

#else

#define RMDNUM 8

#define RMDNUMMASK 0x60000000 /* log2(RMDNUM)<<29 */

#endif

#if 0

#define TMDNUM 1

#define TMDNUMMASK 0x00000000

#else

#define TMDNUM 4

#define TMDNUMMASK 0x40000000 /* log2(TMDNUM)<<29 */

#endif

/* slightly oversized */

#define R_BUF_SIZE 1544

#define T_BUF_SIZE 1544

/*

 * lance register defines

 */

#define L_DATAREG 0x00

#define L_ADDRREG 0x02

#define L_RESET   0x04

#define L_CONFIG  0x05

#define L_BUSIF   0x06

/*

 * to access the lance/am7990-regs, you have to write

 * reg-number into L_ADDRREG, then you can access it using L_DATAREG

 */

#define CSR0  0x00

#define CSR1  0x01

#define CSR2  0x02

#define CSR3  0x03

#define INIT_RING_BEFORE_START  0x1

#define FULL_RESET_ON_ERROR     0x2

#if 0

#define writereg(val,reg) {outw(reg,PORT+L_ADDRREG);inw(PORT+L_ADDRREG); \

                           outw(val,PORT+L_DATAREG);inw(PORT+L_DATAREG);}

#define readreg(reg) (outw(reg,PORT+L_ADDRREG),inw(PORT+L_ADDRREG),\

                       inw(PORT+L_DATAREG))

#if 0

#define writedatareg(val) {outw(val,PORT+L_DATAREG);inw(PORT+L_DATAREG);}

#else

#define writedatareg(val) {  writereg(val,CSR0); }

#endif

#else

#define writereg(val,reg) {outw(reg,PORT+L_ADDRREG);outw(val,PORT+L_DATAREG);}

#define readreg(reg) (outw(reg,PORT+L_ADDRREG),inw(PORT+L_DATAREG))

#define writedatareg(val) { writereg(val,CSR0); }

#endif

static unsigned char ni_vendor[] = { 0x02,0x07,0x01 };

static struct card {

        unsigned char id0,id1;

        short id_offset;

        short total_size;

        short cmd_offset;

        short addr_offset;

        unsigned char *vendor_id;

        char *cardname;

        unsigned long config;

} cards[] = {

        {

                .id0         = NI65_ID0,

                .id1         = NI65_ID1,

                .id_offset   = 0x0e,

                .total_size  = 0x10,

                .cmd_offset  = 0x0,

                .addr_offset = 0x8,

                .vendor_id   = ni_vendor,

                .cardname    = "ni6510",

                .config      = 0x1,

        },

        {

                .id0         = NI65_EB_ID0,

                .id1         = NI65_EB_ID1,

                .id_offset   = 0x0e,

                .total_size  = 0x18,

                .cmd_offset  = 0x10,

                .addr_offset = 0x0,

                .vendor_id   = ni_vendor,

                .cardname    = "ni6510 EtherBlaster",

                .config      = 0x2,

        },

        {

                .id0         = NE2100_ID0,

                .id1         = NE2100_ID1,

                .id_offset   = 0x0e,

                .total_size  = 0x18,

                .cmd_offset  = 0x10,

                .addr_offset = 0x0,

                .vendor_id   = NULL,

                .cardname    = "generic NE2100",

                .config      = 0x0,

        },

};

#define NUM_CARDS 3

struct priv

{

        struct rmd rmdhead[RMDNUM];

        struct tmd tmdhead[TMDNUM];

        struct init_block ib;

        int rmdnum;

        int tmdnum,tmdlast;

#ifdef RCV_VIA_SKB

        struct sk_buff *recv_skb[RMDNUM];

#else

        void *recvbounce[RMDNUM];

#endif

#ifdef XMT_VIA_SKB

        struct sk_buff *tmd_skb[TMDNUM];

#endif

        void *tmdbounce[TMDNUM];

        int tmdbouncenum;

        int lock,xmit_queued;

        struct net_device_stats stats;

        void *self;

        int cmdr_addr;

        int cardno;

        int features;

        spinlock_t ring_lock;

};

static int  ni65_probe1(struct net_device *dev,int);

static irqreturn_t ni65_interrupt(int irq, void * dev_id);

static void ni65_recv_intr(struct net_device *dev,int);

static void ni65_xmit_intr(struct net_device *dev,int);

static int  ni65_open(struct net_device *dev);

static int  ni65_lance_reinit(struct net_device *dev);

static void ni65_init_lance(struct priv *p,unsigned char*,int,int);

static int  ni65_send_packet(struct sk_buff *skb, struct net_device *dev);

static void  ni65_timeout(struct net_device *dev);

static int  ni65_close(struct net_device *dev);

static int  ni65_alloc_buffer(struct net_device *dev);

static void ni65_free_buffer(struct priv *p);

static struct net_device_stats *ni65_get_stats(struct net_device *);

static void set_multicast_list(struct net_device *dev);

static int irqtab[] __initdata = { 9,12,15,5 }; /* irq config-translate */

static int dmatab[] __initdata = { 0,3,5,6,7 }; /* dma config-translate and autodetect */

static int debuglevel = 1;

/*

 * set 'performance' registers .. we must STOP lance for that

 */

static void ni65_set_performance(struct priv *p)

{

        writereg(CSR0_STOP | CSR0_CLRALL,CSR0); /* STOP */

        if( !(cards[p->cardno].config & 0x02) )

                return;

        outw(80,PORT+L_ADDRREG);

        if(inw(PORT+L_ADDRREG) != 80)

                return;

        writereg( (csr80 & 0x3fff) ,80); /* FIFO watermarks */

        outw(0,PORT+L_ADDRREG);

        outw((short)isa0,PORT+L_BUSIF); /* write ISA 0: DMA_R : isa0 * 50ns */

        outw(1,PORT+L_ADDRREG);

        outw((short)isa1,PORT+L_BUSIF); /* write ISA 1: DMA_W : isa1 * 50ns     */

        outw(CSR0,PORT+L_ADDRREG);      /* switch back to CSR0 */

}

/*

 * open interface (up)

 */

static int ni65_open(struct net_device *dev)

{

        struct priv *p = (struct priv *) dev->priv;

        int irqval = request_irq(dev->irq, &ni65_interrupt,0,

                        cards[p->cardno].cardname,dev);

        if (irqval) {

                printk(KERN_ERR "%s: unable to get IRQ %d (irqval=%d).\n",

                          dev->name,dev->irq, irqval);

                return -EAGAIN;

        }

        if(ni65_lance_reinit(dev))

        {

                netif_start_queue(dev);

                return 0;

        }

        else

        {

                free_irq(dev->irq,dev);

                return -EAGAIN;

        }

}

/*

 * close interface (down)

 */

static int ni65_close(struct net_device *dev)

{

        struct priv *p = (struct priv *) dev->priv;

        netif_stop_queue(dev);

        outw(inw(PORT+L_RESET),PORT+L_RESET); /* that's the hard way */

#ifdef XMT_VIA_SKB

        {

                int i;

                for(i=0;i<TMDNUM;i++)

                {

                        if(p->tmd_skb[i]) {

                                dev_kfree_skb(p->tmd_skb[i]);

                                p->tmd_skb[i] = NULL;

                        }

                }

        }

#endif

        free_irq(dev->irq,dev);

        return 0;

}

static void cleanup_card(struct net_device *dev)

{

        struct priv *p = (struct priv *) dev->priv;

        disable_dma(dev->dma);

        free_dma(dev->dma);

        release_region(dev->base_addr, cards[p->cardno].total_size);

        ni65_free_buffer(p);

}

/* set: io,irq,dma or set it when calling insmod */

static int irq;

static int io;

static int dma;

/*

 * Probe The Card (not the lance-chip)

 */

struct net_device * __init ni65_probe(int unit)

{

        struct net_device *dev = alloc_etherdev(0);

        static int ports[] = {0x360,0x300,0x320,0x340, 0};

        int *port;

        int err = 0;

        if (!dev)

                return ERR_PTR(-ENOMEM);

        if (unit >= 0) {

                sprintf(dev->name, "eth%d", unit);

                netdev_boot_setup_check(dev);

                irq = dev->irq;

                dma = dev->dma;

        } else {

                dev->base_addr = io;

        }

        if (dev->base_addr > 0x1ff) { /* Check a single specified location. */

                err = ni65_probe1(dev, dev->base_addr);

        } else if (dev->base_addr > 0) { /* Don't probe at all. */

                err = -ENXIO;

        } else {

                for (port = ports; *port && ni65_probe1(dev, *port); port++)

                        ;

                if (!*port)

                        err = -ENODEV;

        }

        if (err)

                goto out;

        err = register_netdev(dev);

        if (err)

                goto out1;

        return dev;

out1:

        cleanup_card(dev);

out:

        free_netdev(dev);

        return ERR_PTR(err);

}

/*

 * this is the real card probe ..

 */

static int __init ni65_probe1(struct net_device *dev,int ioaddr)

{

        int i,j;

        struct priv *p;

        unsigned long flags;

        dev->irq = irq;

        dev->dma = dma;

        for(i=0;i<NUM_CARDS;i++) {

                if(!request_region(ioaddr, cards[i].total_size, cards[i].cardname))

                        continue;

                if(cards[i].id_offset >= 0) {

                        if(inb(ioaddr+cards[i].id_offset+0) != cards[i].id0 ||

                                 inb(ioaddr+cards[i].id_offset+1) != cards[i].id1) {

                                 release_region(ioaddr, cards[i].total_size);

                                 continue;

                        }

                }

                if(cards[i].vendor_id) {

                        for(j=0;j<3;j++)

                                if(inb(ioaddr+cards[i].addr_offset+j) != cards[i].vendor_id[j]) {

                                        release_region(ioaddr, cards[i].total_size);

                                        continue;

                          }

                }

                break;

        }

        if(i == NUM_CARDS)

                return -ENODEV;

        for(j=0;j<6;j++)

                dev->dev_addr[j] = inb(ioaddr+cards[i].addr_offset+j);

        if( (j=ni65_alloc_buffer(dev)) < 0) {

                release_region(ioaddr, cards[i].total_size);

                return j;

        }

        p = (struct priv *) dev->priv;

        p->cmdr_addr = ioaddr + cards[i].cmd_offset;

        p->cardno = i;

        spin_lock_init(&p->ring_lock);

        printk(KERN_INFO "%s: %s found at %#3x, ", dev->name, cards[p->cardno].cardname , ioaddr);

        outw(inw(PORT+L_RESET),PORT+L_RESET); /* first: reset the card */

        if( (j=readreg(CSR0)) != 0x4) {

                 printk("failed.\n");

                 printk(KERN_ERR "%s: Can't RESET card: %04x\n", dev->name, j);

                 ni65_free_buffer(p);

                 release_region(ioaddr, cards[p->cardno].total_size);

                 return -EAGAIN;

        }

        outw(88,PORT+L_ADDRREG);

        if(inw(PORT+L_ADDRREG) == 88) {

                unsigned long v;

                v = inw(PORT+L_DATAREG);

                v <<= 16;

                outw(89,PORT+L_ADDRREG);

                v |= inw(PORT+L_DATAREG);

                printk("Version %#08lx, ",v);

                p->features = INIT_RING_BEFORE_START;

        }

        else {

                printk("ancient LANCE, ");

                p->features = 0x0;

        }

        if(test_bit(0,&cards[i].config)) {

                dev->irq = irqtab[(inw(ioaddr+L_CONFIG)>>2)&3];

                dev->dma = dmatab[inw(ioaddr+L_CONFIG)&3];

                printk("IRQ %d (from card), DMA %d (from card).\n",dev->irq,dev->dma);

        }

        else {

                if(dev->dma == 0) {

                /* 'stuck test' from lance.c */

                        long dma_channels = ((inb(DMA1_STAT_REG) >> 4) & 0x0f) |

                                            (inb(DMA2_STAT_REG) & 0xf0);

                        for(i=1;i<5;i++) {

                                int dma = dmatab[i];

                                if(test_bit(dma,&dma_channels) || request_dma(dma,"ni6510"))

                                        continue;

                                flags=claim_dma_lock();

                                disable_dma(dma);

                                set_dma_mode(dma,DMA_MODE_CASCADE);

                                enable_dma(dma);

                                release_dma_lock(flags);

                                ni65_init_lance(p,dev->dev_addr,0,0); /* trigger memory access */

                                flags=claim_dma_lock();

                                disable_dma(dma);

                                free_dma(dma);

                                release_dma_lock(flags);

                                if(readreg(CSR0) & CSR0_IDON)

                                        break;

                        }

                        if(i == 5) {

                                printk("failed.\n");

                                printk(KERN_ERR "%s: Can't detect DMA channel!\n", dev->name);

                                ni65_free_buffer(p);

                                release_region(ioaddr, cards[p->cardno].total_size);

                                return -EAGAIN;

                        }

                        dev->dma = dmatab[i];

                        printk("DMA %d (autodetected), ",dev->dma);

                }

                else

                        printk("DMA %d (assigned), ",dev->dma);

                if(dev->irq < 2)

                {

                        unsigned long irq_mask;

                        ni65_init_lance(p,dev->dev_addr,0,0);

                        irq_mask = probe_irq_on();

                        writereg(CSR0_INIT|CSR0_INEA,CSR0); /* trigger interrupt */

                        msleep(20);

                        dev->irq = probe_irq_off(irq_mask);

                        if(!dev->irq)

                        {

                                printk("Failed to detect IRQ line!\n");

                                ni65_free_buffer(p);

                                release_region(ioaddr, cards[p->cardno].total_size);

                                return -EAGAIN;

                        }

                        printk("IRQ %d (autodetected).\n",dev->irq);

                }

                else

                        printk("IRQ %d (assigned).\n",dev->irq);

        }

        if(request_dma(dev->dma, cards[p->cardno].cardname ) != 0)

        {

                printk(KERN_ERR "%s: Can't request dma-channel %d\n",dev->name,(int) dev->dma);

                ni65_free_buffer(p);

                release_region(ioaddr, cards[p->cardno].total_size);

                return -EAGAIN;

        }

        dev->base_addr = ioaddr;

        dev->open               = ni65_open;

        dev->stop               = ni65_close;

        dev->hard_start_xmit    = ni65_send_packet;

        dev->tx_timeout         = ni65_timeout;

        dev->watchdog_timeo     = HZ/2;

        dev->get_stats          = ni65_get_stats;

        dev->set_multicast_list = set_multicast_list;

        return 0; /* everything is OK */

}

/*

 * set lance register and trigger init

 */

static void ni65_init_lance(struct priv *p,unsigned char *daddr,int filter,int mode)

{

        int i;

        u32 pib;

        writereg(CSR0_CLRALL|CSR0_STOP,CSR0);

        for(i=0;i<6;i++)

                p->ib.eaddr[i] = daddr[i];

        for(i=0;i<8;i++)

                p->ib.filter[i] = filter;

        p->ib.mode = mode;

        p->ib.trp = (u32) isa_virt_to_bus(p->tmdhead) | TMDNUMMASK;

        p->ib.rrp = (u32) isa_virt_to_bus(p->rmdhead) | RMDNUMMASK;

        writereg(0,CSR3);        /* busmaster/no word-swap */

        pib = (u32) isa_virt_to_bus(&p->ib);

        writereg(pib & 0xffff,CSR1);

        writereg(pib >> 16,CSR2);

        writereg(CSR0_INIT,CSR0); /* this changes L_ADDRREG to CSR0 */

        for(i=0;i<32;i++)

        {

                mdelay(4);

                if(inw(PORT+L_DATAREG) & (CSR0_IDON | CSR0_MERR) )

                        break; /* init ok ? */

        }

}

/*

 * allocate memory area and check the 16MB border

 */

static void *ni65_alloc_mem(struct net_device *dev,char *what,int size,int type)

{

        struct sk_buff *skb=NULL;

        unsigned char *ptr;

        void *ret;

        if(type) {

                ret = skb = alloc_skb(2+16+size,GFP_KERNEL|GFP_DMA);

                if(!skb) {

                        printk(KERN_WARNING "%s: unable to allocate %s memory.\n",dev->name,what);

                        return NULL;

                }

                skb_reserve(skb,2+16);

                skb_put(skb,R_BUF_SIZE);         /* grab the whole space .. (not necessary) */

                ptr = skb->data;

        }

        else {

                ret = ptr = kmalloc(T_BUF_SIZE,GFP_KERNEL | GFP_DMA);

                if(!ret) {

                        printk(KERN_WARNING "%s: unable to allocate %s memory.\n",dev->name,what);

                        return NULL;

                }

        }

        if( (u32) virt_to_phys(ptr+size) > 0x1000000) {

                printk(KERN_WARNING "%s: unable to allocate %s memory in lower 16MB!\n",dev->name,what);

                if(type)

                        kfree_skb(skb);

                else

                        kfree(ptr);

                return NULL;

        }

        return ret;

}

/*

 * allocate all memory structures .. send/recv buffers etc ...

 */

static int ni65_alloc_buffer(struct net_device *dev)

{

        unsigned char *ptr;

        struct priv *p;

        int i;

        /*

         * we need 8-aligned memory ..

         */

        ptr = ni65_alloc_mem(dev,"BUFFER",sizeof(struct priv)+8,0);

        if(!ptr)

                return -ENOMEM;

        p = dev->priv = (struct priv *) (((unsigned long) ptr + 7) & ~0x7);

        memset((char *) dev->priv,0,sizeof(struct priv));

        p->self = ptr;