/*
 * sonic.c
 *
 * (C) 1996,1998 by Thomas Bogendoerfer (tsbogend@alpha.franken.de)
 * 
 * This driver is based on work from Andreas Busse, but most of
 * the code is rewritten.
 * 
 * (C) 1995 by Andreas Busse (andy@waldorf-gmbh.de)
 *
 * A driver for the onboard Sonic ethernet controller on Mips Jazz
 * systems (Acer Pica-61, Mips Magnum 4000, Olivetti M700 and
 * perhaps others, too)
 */

#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/init.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <linux/malloc.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <asm/bootinfo.h>
#include <asm/system.h>
#include <asm/bitops.h>
#include <asm/pgtable.h>
#include <asm/segment.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <asm/jazz.h>
#include <asm/jazzdma.h>
#include <linux/errno.h>

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

#define SREGS_PAD(n)    u16 n;

#include "sonic.h"

/*
 * Macros to access SONIC registers
 */
#define SONIC_READ(reg) \
	*((volatile unsigned int *)base_addr+reg)

#define SONIC_WRITE(reg,val) \
	*((volatile unsigned int *)base_addr+reg) = val


/* use 0 for production, 1 for verification, >2 for debug */
#ifdef SONIC_DEBUG
static unsigned int sonic_debug = SONIC_DEBUG;
#else 
static unsigned int sonic_debug = 1;
#endif

/*
 * Base address and interupt of the SONIC controller on JAZZ boards
 */
static struct {
    unsigned int port;
    unsigned int irq;
} sonic_portlist[] = { {JAZZ_ETHERNET_BASE, JAZZ_ETHERNET_IRQ}, {0, 0}};

/*
 * We cannot use station (ethernet) address prefixes to detect the
 * sonic controller since these are board manufacturer depended.
 * So we check for known Silicon Revision IDs instead. 
 */
static unsigned short known_revisions[] =
{
  0x04,				/* Mips Magnum 4000 */
  0xffff			/* end of list */
};

/* Index to functions, as function prototypes. */

extern int sonic_probe(struct net_device *dev);
static int sonic_probe1(struct net_device *dev, unsigned int base_addr, unsigned int irq);


/*
 * Probe for a SONIC ethernet controller on a Mips Jazz board.
 * Actually probing is superfluous but we're paranoid.
 */
int __init sonic_probe(struct net_device *dev)
{
    unsigned int base_addr = dev ? dev->base_addr : 0;
    int i;

    /*
     * Don't probe if we're not running on a Jazz board.
     */
    if (mips_machgroup != MACH_GROUP_JAZZ)
	return -ENODEV;
    if (base_addr >= KSEG0)	/* Check a single specified location. */
	return sonic_probe1(dev, base_addr, dev->irq);
    else if (base_addr != 0)	/* Don't probe at all. */
	return -ENXIO;
    
    for (i = 0; sonic_portlist[i].port; i++) {
	int base_addr = sonic_portlist[i].port;
	if (check_region(base_addr, 0x100))
	    continue;
	if (sonic_probe1(dev, base_addr, sonic_portlist[i].irq) == 0)
	    return 0;
    }
    return -ENODEV;
}

static int __init sonic_probe1(struct net_device *dev,
                               unsigned int base_addr, unsigned int irq)
{
    static unsigned version_printed = 0;
    unsigned int silicon_revision;
    unsigned int val;
    struct sonic_local *lp;
    int i;
    
    /*
     * get the Silicon Revision ID. If this is one of the known
     * one assume that we found a SONIC ethernet controller at
     * the expected location.
     */
    silicon_revision = SONIC_READ(SONIC_SR);
    if (sonic_debug > 1)
      printk("SONIC Silicon Revision = 0x%04x\n",silicon_revision);

    i = 0;
    while ((known_revisions[i] != 0xffff) &&
	   (known_revisions[i] != silicon_revision))
      i++;
	
    if (known_revisions[i] == 0xffff) {
	printk("SONIC ethernet controller not found (0x%4x)\n",
	       silicon_revision);
	return -ENODEV;
    }
    
    request_region(base_addr, 0x100, "SONIC");
    
    /* Allocate a new 'dev' if needed. */
    if (dev == NULL)
      dev = init_etherdev(0, sizeof(struct sonic_local));

    if (sonic_debug  &&  version_printed++ == 0)
      printk(version);

    printk("%s: %s found at 0x%08x, ",
	   dev->name, "SONIC ethernet", base_addr);

    /* Fill in the 'dev' fields. */
    dev->base_addr = base_addr;
    dev->irq = irq;

    /*
     * Put the sonic into software reset, then
     * retrieve and print the ethernet address.
     */
    SONIC_WRITE(SONIC_CMD,SONIC_CR_RST);
    SONIC_WRITE(SONIC_CEP,0);
    for (i=0; i<3; i++) {
	val = SONIC_READ(SONIC_CAP0-i);
	dev->dev_addr[i*2] = val;
	dev->dev_addr[i*2+1] = val >> 8;
    }

    printk("HW Address ");
    for (i = 0; i < 6; i++) {
	printk("%2.2x", dev->dev_addr[i]);
	if (i<5)
	  printk(":");
    }
    
    printk(" IRQ %d\n", irq);
    
    /* Initialize the device structure. */
    if (dev->priv == NULL) {
	/*
	 * the memory be located in the same 64kb segment
	 */
	lp = NULL;
	i = 0;
	do {
	    lp = (struct sonic_local *)kmalloc(sizeof(*lp), GFP_KERNEL);
	    if ((unsigned long)lp >> 16 != ((unsigned long)lp + sizeof(*lp) ) >> 16) {
		/* FIXME, free the memory later */
		kfree (lp);
		lp = NULL;
	    }
	} while (lp == NULL && i++ < 20);
	
	if (lp == NULL) {
	    printk ("%s: couldn't allocate memory for descriptors\n",
	            dev->name);
	    return -ENOMEM;
	}
	
	memset(lp, 0, sizeof(struct sonic_local));
	
	/* get the virtual dma address */
	lp->cda_laddr = vdma_alloc(PHYSADDR(lp),sizeof(*lp));
	if (lp->cda_laddr == ~0UL) {
	    printk ("%s: couldn't get DMA page entry for descriptors\n",
	            dev->name);
	    return -ENOMEM;
	}

	lp->tda_laddr = lp->cda_laddr + sizeof (lp->cda);
	lp->rra_laddr = lp->tda_laddr + sizeof (lp->tda);
	lp->rda_laddr = lp->rra_laddr + sizeof (lp->rra);
	
	/* allocate receive buffer area */
	/* FIXME, maybe we should use skbs */
	if ((lp->rba = (char *)kmalloc(SONIC_NUM_RRS * SONIC_RBSIZE, GFP_KERNEL)) == NULL) {
	    printk ("%s: couldn't allocate receive buffers\n",dev->name);
	    return -ENOMEM;
	}
	
	/* get virtual dma address */
	if ((lp->rba_laddr = vdma_alloc(PHYSADDR(lp->rba),SONIC_NUM_RRS * SONIC_RBSIZE)) == ~0UL) {
	    printk ("%s: couldn't get DMA page entry for receive buffers\n",dev->name);
	    return -ENOMEM;
	}
	
	/* now convert pointer to KSEG1 pointer */
	lp->rba = (char *)KSEG1ADDR(lp->rba);
	flush_cache_all();
	dev->priv = (struct sonic_local *)KSEG1ADDR(lp);
    }

    lp = (struct sonic_local *)dev->priv;
    dev->open = sonic_open;
    dev->stop = sonic_close;
    dev->hard_start_xmit = sonic_send_packet;
    dev->get_stats	= sonic_get_stats;
    dev->set_multicast_list = &sonic_multicast_list;

    /*
     * clear tally counter
     */
    SONIC_WRITE(SONIC_CRCT,0xffff);
    SONIC_WRITE(SONIC_FAET,0xffff);
    SONIC_WRITE(SONIC_MPT,0xffff);

    /* Fill in the fields of the device structure with ethernet values. */
    ether_setup(dev);
    return 0;
}

/*
 *      SONIC uses a normal IRQ
 */
#define sonic_request_irq       request_irq
#define sonic_free_irq          free_irq

#define sonic_chiptomem(x)      KSEG1ADDR(vdma_log2phys(x))

#include "sonic.c"
