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/*
 * linux/drivers/net/am79c961.c
 */
 
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/ptrace.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <linux/malloc.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
 
#include <asm/system.h>
#include <asm/bitops.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <asm/ecard.h>
#include <asm/delay.h>
 
#define TX_BUFFERS 15
#define RX_BUFFERS 25
 
#include "am79c961a.h"
 
static unsigned int net_debug = NET_DEBUG;
 
static void
am79c961_setmulticastlist (struct device *dev);
 
static char *version = "am79c961 ethernet driver (c) 1995 R.M.King v0.00\n";
 
#define FUNC_PROLOGUE \
	struct dev_priv *priv = (struct dev_priv *)dev->priv
 
/* --------------------------------------------------------------------------- */
 
static void
write_rreg (unsigned long base, unsigned int reg, unsigned short val)
{
    __asm__("
	strh	%1, [%2]	@ NET_RAP
	strh	%0, [%2, #-4]	@ NET_RDP
	" : : "r" (val), "r" (reg), "r" (0xf0000464));
}
 
static inline void
write_ireg (unsigned long base, unsigned int reg, unsigned short val)
{
    __asm__("
	strh	%1, [%2]	@ NET_RAP
	strh	%0, [%2, #8]	@ NET_RDP
	" : : "r" (val), "r" (reg), "r" (0xf0000464));
}
 
#define am_writeword(dev,off,val)\
    __asm__("\
	strh	%0, [%1]\
	" : : "r" ((val) & 0xffff), "r" (0xe0000000 + ((off) << 1)));
 
static inline void
am_writebuffer(struct device *dev, unsigned int offset, unsigned char *buf, unsigned int length)
{
	offset = 0xe0000000 + (offset << 1);
	length = (length + 1) & ~1;
	if ((int)buf & 2) {
		__asm__ __volatile__("
			strh	%2, [%0], #4
		" : "=&r" (offset) : "0" (offset), "r" (buf[0] | (buf[1] << 8)));
		buf += 2;
		length -= 2;
	}
	while (length > 8) {
		unsigned int tmp, tmp2;
		__asm__ __volatile__("
			ldmia	%1!, {%2, %3}
			strh	%2, [%0], #4
			mov	%2, %2, lsr #16
			strh	%2, [%0], #4
			strh	%3, [%0], #4
			mov	%3, %3, lsr #16
			strh	%3, [%0], #4
		" : "=&r" (offset), "=&r" (buf), "=r" (tmp), "=r" (tmp2)
		  : "0" (offset), "1" (buf));
		length -= 8;
	}
	while (length > 0) {
		__asm__ __volatile__("
			strh	%2, [%0], #4
		" : "=&r" (offset) : "0" (offset), "r" (buf[0] | (buf[1] << 8)));
		buf += 2;
		length -= 2;
	}
}
 
static inline unsigned short
read_rreg (unsigned int base_addr, unsigned int reg)
{
    unsigned short v;
    __asm__("
	strh	%1, [%2]	@ NET_RAP
	ldrh	%0, [%2, #-4]	@ NET_IDP
	" : "=r" (v): "r" (reg), "r" (0xf0000464));
    return v;
}
 
static inline unsigned short
am_readword (struct device *dev, unsigned long off)
{
    unsigned long address = 0xe0000000 + (off << 1);
    unsigned short val;
 
    __asm__("
	ldrh	%0, [%1]
	" : "=r" (val): "r" (address));
    return val;
}
 
static inline void
am_readbuffer(struct device *dev, unsigned int offset, unsigned char *buf, unsigned int length)
{
	offset = 0xe0000000 + (offset << 1);
	length = (length + 1) & ~1;
	if ((int)buf & 2) {
		unsigned int tmp;
		__asm__ __volatile__("
			ldrh	%2, [%0], #4
			strb	%2, [%1], #1
			mov	%2, %2, lsr #8
			strb	%2, [%1], #1
		" : "=&r" (offset), "=&r" (buf), "=r" (tmp): "0" (offset), "1" (buf));
		length -= 2;
	}
	while (length > 8) {
		unsigned int tmp, tmp2, tmp3;
		__asm__ __volatile__("
			ldrh	%2, [%0], #4
			ldrh	%3, [%0], #4
			orr	%2, %2, %3, lsl #16
			ldrh	%3, [%0], #4
			ldrh	%4, [%0], #4
			orr	%3, %3, %4, lsl #16
			stmia	%1!, {%2, %3}
		" : "=&r" (offset), "=&r" (buf), "=r" (tmp), "=r" (tmp2), "=r" (tmp3)
		  : "0" (offset), "1" (buf));
		length -= 8;
	}
	while (length > 0) {
		unsigned int tmp;
		__asm__ __volatile__("
			ldrh	%2, [%0], #4
			strb	%2, [%1], #1
			mov	%2, %2, lsr #8
			strb	%2, [%1], #1
		" : "=&r" (offset), "=&r" (buf), "=r" (tmp) : "0" (offset), "1" (buf));
		length -= 2;
	}
}
 
static int
am79c961_ramtest(struct device *dev, unsigned int val)
{
	unsigned char *buffer = kmalloc (65536, GFP_KERNEL);
	int i, error = 0, errorcount = 0;
 
	if (!buffer)
		return 0;
	memset (buffer, val, 65536);
	am_writebuffer(dev, 0, buffer, 65536);
	memset (buffer, val ^ 255, 65536);
	am_readbuffer(dev, 0, buffer, 65536);
	for (i = 0; i < 65536; i++) {
		if (buffer[i] != val && !error) {
			printk ("%s: buffer error (%02X %02X) %05X - ", dev->name, val, buffer[i], i);
			error = 1;
			errorcount ++;
		} else if (error && buffer[i] == val) {
			printk ("%05X\n", i);
			error = 0;
		}
	}
	if (error)
		printk ("10000\n");
	kfree (buffer);
	return errorcount;
}
 
static void
am79c961_init_for_open(struct device *dev)
{
    FUNC_PROLOGUE;
    unsigned long hdr_addr, first_free_addr;
    unsigned long flags;
    unsigned char *p;
    int i;
 
    save_flags_cli (flags);
 
    write_ireg (dev->base_addr, 2, 0x4000); /* autoselect media */
    write_rreg (dev->base_addr, CSR0, CSR0_BABL|CSR0_CERR|CSR0_MISS|CSR0_MERR|CSR0_TINT|CSR0_RINT|CSR0_STOP);
 
    restore_flags (flags);
 
    first_free_addr = RX_BUFFERS * 8 + TX_BUFFERS * 8 + 16;
    hdr_addr = 0;
 
    priv->rxhead = 0;
    priv->rxtail = 0;
    priv->rxhdr = hdr_addr;
 
    for (i = 0; i < RX_BUFFERS; i++) {
    	priv->rxbuffer[i] = first_free_addr;
	am_writeword (dev, hdr_addr, first_free_addr);
	am_writeword (dev, hdr_addr + 2, RMD_OWN);
	am_writeword (dev, hdr_addr + 4, (-1600));
	am_writeword (dev, hdr_addr + 6, 0);
	first_free_addr += 1600;
	hdr_addr += 8;
    }
    priv->txhead = 0;
    priv->txtail = 0;
    priv->txhdr = hdr_addr;
    for (i = 0; i < TX_BUFFERS; i++) {
    	priv->txbuffer[i] = first_free_addr;
	am_writeword (dev, hdr_addr, first_free_addr);
	am_writeword (dev, hdr_addr + 2, 0);
	am_writeword (dev, hdr_addr + 4, 0);
	am_writeword (dev, hdr_addr + 6, 0);
	first_free_addr += 1600;
	hdr_addr += 8;
    }
 
    for (i = LADRL; i <= LADRH; i++)
	write_rreg (dev->base_addr, i, 0);
 
    for (i = PADRL, p = dev->dev_addr; i <= PADRH; i++, p += 2)
	write_rreg (dev->base_addr, i, p[0] | (p[1] << 8));
 
    i = MODE_PORT0;
    if (dev->flags & IFF_PROMISC)
	i |= MODE_PROMISC;
 
    write_rreg (dev->base_addr, MODE, i);
    write_rreg (dev->base_addr, BASERXL, priv->rxhdr);
    write_rreg (dev->base_addr, BASERXH, 0);
    write_rreg (dev->base_addr, BASETXL, priv->txhdr);
    write_rreg (dev->base_addr, BASERXH, 0);
    write_rreg (dev->base_addr, POLLINT, 0);
    write_rreg (dev->base_addr, SIZERXR, -RX_BUFFERS);
    write_rreg (dev->base_addr, SIZETXR, -TX_BUFFERS);
    write_rreg (dev->base_addr, CSR0, CSR0_STOP);
    write_rreg (dev->base_addr, CSR3, CSR3_IDONM|CSR3_BABLM);
    write_rreg (dev->base_addr, CSR0, CSR0_IENA|CSR0_STRT);
}
 
static int
am79c961_init(struct device *dev)
{
    unsigned long flags;
 
    am79c961_ramtest(dev, 0x66);
    am79c961_ramtest(dev, 0x99);
 
    save_flags_cli (flags);
 
    write_ireg (dev->base_addr, 2, 0x4000); /* autoselect media */
    write_rreg (dev->base_addr, CSR0, CSR0_STOP);
    write_rreg (dev->base_addr, CSR3, CSR3_MASKALL);
 
    restore_flags (flags);
 
    return 0;
}
 
/*
 * This is the real probe routine.
 */
static int
am79c961_probe1(struct device *dev)
{
    static unsigned version_printed = 0;
    struct dev_priv *priv;
    int i;
 
    if (!dev->priv) {
	dev->priv = kmalloc (sizeof (struct dev_priv), GFP_KERNEL);
	if (!dev->priv)
	    return -ENOMEM;
    }
 
    priv = (struct dev_priv *) dev->priv;
    memset (priv, 0, sizeof(struct dev_priv));
 
    /*
     * The PNP initialisation should have been done by the ether bootp loader.
     */
    inb ((dev->base_addr + NET_RESET) >> 1);	/* reset the device */
 
    udelay (5);
 
    if (inb (dev->base_addr >> 1) != 0x08 ||
	inb ((dev->base_addr >> 1) + 1) != 00 ||
	inb ((dev->base_addr >> 1) + 2) != 0x2b) {
	kfree (dev->priv);
	dev->priv = NULL;
	return -ENODEV;
    }
 
    /*
     * Ok, we've found a valid hw ID
     */
 
    if (net_debug  &&  version_printed++ == 0)
	printk (KERN_INFO "%s", version);
 
    printk(KERN_INFO "%s: am79c961 found [%04lx, %d] ", dev->name, dev->base_addr, dev->irq);
    request_region (dev->base_addr, 0x18, "am79c961");
 
    /* Retrive and print the ethernet address. */
    for (i = 0; i < 6; i++) {
    	dev->dev_addr[i] = inb ((dev->base_addr >> 1) + i) & 0xff;
	printk (i == 5 ? "%02x\n" : "%02x:", dev->dev_addr[i]);
    }
 
    if (am79c961_init(dev)) {
	kfree (dev->priv);
	dev->priv = NULL;
	return -ENODEV;
    }
 
    dev->open = am79c961_open;
    dev->stop = am79c961_close;
    dev->hard_start_xmit = am79c961_sendpacket;
    dev->get_stats = am79c961_getstats;
    dev->set_multicast_list = am79c961_setmulticastlist;
 
    /* Fill in the fields of the device structure with ethernet values. */
    ether_setup(dev);
    return 0;
}
 
int
am79c961_probe(struct device *dev)
{
    static int initialised = 0;
 
    if (initialised)
	return -ENODEV;
    initialised = 1;
 
    dev->base_addr = 0x220;
    dev->irq = 3;
 
    return am79c961_probe1(dev);
}
 
/*
 * Open/initialize the board.  This is called (in the current kernel)
 * sometime after booting when the 'ifconfig' program is run.
 *
 * This routine should set everything up anew at each open, even
 * registers that "should" only need to be set once at boot, so that
 * there is non-reboot way to recover if something goes wrong.
 */
static int
am79c961_open(struct device *dev)
{
    FUNC_PROLOGUE;
 
    MOD_INC_USE_COUNT;
 
    memset (&priv->stats, 0, sizeof (priv->stats));
 
    if (request_irq(dev->irq, am79c961_interrupt, 0, "am79c961", dev))
	return -EAGAIN;
 
    am79c961_init_for_open(dev);
 
    dev->tbusy = 0;
    dev->interrupt = 0;
    dev->start = 1;
    return 0;
}
 
/*
 * The inverse routine to am79c961_open().
 */
static int
am79c961_close(struct device *dev)
{
    dev->tbusy = 1;
    dev->start = 0;
 
    am79c961_init(dev);
 
    free_irq (dev->irq, dev);
 
    MOD_DEC_USE_COUNT;
    return 0;
}
 
/*
 * Get the current statistics.	This may be called with the card open or
 * closed.
 */
static struct enet_statistics *am79c961_getstats (struct device *dev)
{
    FUNC_PROLOGUE;
    return &priv->stats;
}
 
/*
 * Set or clear promiscuous/multicast mode filter for this adaptor.
 *
 * We don't attempt any packet filtering.  The card may have a SEEQ 8004
 * in which does not have the other ethernet address registers present...
 */
static void am79c961_setmulticastlist (struct device *dev)
{
    unsigned long flags;
    int i;
 
    dev->flags &= ~IFF_ALLMULTI;
 
    i = MODE_PORT0;
    if (dev->flags & IFF_PROMISC)
	i |= MODE_PROMISC;
 
    save_flags_cli (flags);
    write_rreg (dev->base_addr, MODE, i);
    restore_flags (flags);
}
 
/*
 * Transmit a packet
 */
static int
am79c961_sendpacket(struct sk_buff *skb, struct device *dev)
{
	FUNC_PROLOGUE;
 
	if (!dev->tbusy) {
again:
		if (skb) {
			if (!set_bit(0, (void*)&dev->tbusy)) {
				unsigned int length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
				unsigned int hdraddr, bufaddr;
				unsigned long flags;
 
				hdraddr = priv->txhdr + (priv->txhead << 3);
				bufaddr = priv->txbuffer[priv->txhead];
				priv->txhead ++;
				if (priv->txhead >= TX_BUFFERS)
					priv->txhead = 0;
 
				am_writebuffer (dev, bufaddr, skb->data, length);
				am_writeword (dev, hdraddr + 4, -length);
				am_writeword (dev, hdraddr + 2, TMD_OWN|TMD_STP|TMD_ENP);
 
				save_flags_cli (flags);
				write_rreg (dev->base_addr, CSR0, CSR0_TDMD|CSR0_IENA);
				dev->trans_start = jiffies;
				restore_flags (flags);
 
				if (!(am_readword (dev, priv->txhdr + (priv->txhead << 3) + 2) & TMD_OWN))
					dev->tbusy = 0;
				dev_kfree_skb (skb, FREE_WRITE);
				return 0;
			} else
				printk(KERN_ERR "%s: Transmitter access conflict.\n", dev->name);
				return 1;
		} else {
			dev_tint(dev);
			return 0;
		}
	} else {
		int tickssofar = jiffies - dev->trans_start;
		if (tickssofar < 5)
			return 1;
		printk (KERN_WARNING "%s: transmit timed out, network cable problem?\n", dev->name);
		/* Try to restart the adaptor. */
		dev->tbusy = 0;
		dev->trans_start = jiffies;
		goto again;
	}
}
 
static void
am79c961_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
    struct device *dev = (struct device *)dev_id;
    struct dev_priv *priv = (struct dev_priv *)dev->priv;
    unsigned int status;
 
#if NET_DEBUG > 1
    if(net_debug & DEBUG_INT)
	printk(KERN_DEBUG "am79c961irq: %d ", irq);
#endif
 
    dev->interrupt = 1;
 
    status = read_rreg (dev->base_addr, CSR0);
    write_rreg (dev->base_addr, CSR0, status & (CSR0_TINT|CSR0_RINT|CSR0_MISS|CSR0_IENA));
 
    if (status & CSR0_RINT) /* Got a packet(s). */
	am79c961_rx (dev, priv);
    if (status & CSR0_TINT) /* Packets transmitted */
	am79c961_tx (dev, priv);
    if (status & CSR0_MISS)
	priv->stats.rx_dropped ++;
 
    dev->interrupt = 0;
 
#if NET_DEBUG > 1
    if(net_debug & DEBUG_INT)
	printk("done\n");
#endif
}
 
/*
 * If we have a good packet(s), get it/them out of the buffers.
 */
static void
am79c961_rx(struct device *dev, struct dev_priv *priv)
{
	unsigned long hdraddr;
	unsigned long pktaddr;
 
	do {
		unsigned long status;
		struct sk_buff *skb;
		int len;
 
		hdraddr = priv->rxhdr + (priv->rxtail << 3);
		pktaddr = priv->rxbuffer[priv->rxtail];
 
		status = am_readword (dev, hdraddr + 2);
		if (status & RMD_OWN) /* do we own it? */
			break;
 
		priv->rxtail ++;
		if (priv->rxtail >= RX_BUFFERS)
			priv->rxtail = 0;
 
		if ((status & (RMD_ERR|RMD_STP|RMD_ENP)) != (RMD_STP|RMD_ENP)) {
			am_writeword (dev, hdraddr + 2, RMD_OWN);
			priv->stats.rx_errors ++;
			if (status & RMD_ERR) {
				if (status & RMD_FRAM)
					priv->stats.rx_frame_errors ++;
				if (status & RMD_CRC)
					priv->stats.rx_crc_errors ++;
			} else if (status & RMD_STP)
				priv->stats.rx_length_errors ++;
			continue;
		}
 
		len = am_readword (dev, hdraddr + 6);
		skb = dev_alloc_skb (len + 2);
 
		if (skb) {
			unsigned char *buf;
 
			skb->dev = dev;
			skb_reserve (skb, 2);
			buf = skb_put (skb, len);
 
			am_readbuffer (dev, pktaddr, buf, len);
			am_writeword (dev, hdraddr + 2, RMD_OWN);
			skb->protocol = eth_type_trans(skb, dev);
			netif_rx (skb);
			priv->stats.rx_packets ++;
		} else {
			am_writeword (dev, hdraddr + 2, RMD_OWN);
			printk (KERN_WARNING "%s: memory squeeze, dropping packet.\n", dev->name);
			priv->stats.rx_dropped ++;
			break;
		}
	} while (1);
}
 
/*
 * Update stats for the transmitted packet
 */
static void
am79c961_tx(struct device *dev, struct dev_priv *priv)
{
	do {
		unsigned long hdraddr;
		unsigned long status;
 
		hdraddr = priv->txhdr + (priv->txtail << 3);
		status = am_readword (dev, hdraddr + 2);
		if (status & TMD_OWN)
			break;
 
		priv->txtail ++;
		if (priv->txtail >= TX_BUFFERS)
			priv->txtail = 0;
 
		if (status & TMD_ERR) {
			unsigned long status2;
 
			priv->stats.tx_errors ++;
 
			status2 = am_readword (dev, hdraddr + 6);
			am_writeword (dev, hdraddr + 6, 0);
 
			if (status2 & TST_RTRY)
				priv->stats.collisions += 1;
			if (status2 & TST_LCOL)
				priv->stats.tx_window_errors ++;
			if (status2 & TST_LCAR)
				priv->stats.tx_carrier_errors ++;
			if (status2 & TST_UFLO)
				priv->stats.tx_fifo_errors ++;
			continue;
		}
		priv->stats.tx_packets ++;
	} while (priv->txtail != priv->txhead);
 
	dev->tbusy = 0;
	mark_bh (NET_BH);
}