drivers/net/macsonic.c - pub/scm/linux/kernel/git/iwlwifi/iwlwifi-next - Git at Google

 /*
  * macsonic.c
  *
  * (C) 1998 Alan Cox
  *
  * Debugging Andreas Ehliar, Michael Schmitz
  *
  * Based on code
  * (C) 1996 by Thomas Bogendoerfer (tsbogend@bigbug.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 Mac onboard Sonic ethernet chip.
  *
  * 98/12/21 MSch: judged from tests on Q800, it's basically working,
  *		  but eating up both receive and transmit resources
  *		  and duplicating packets. Needs more testing.
  *
  * 99/01/03 MSch: upgraded to version 0.92 of the core driver, fixed.
  *
  * 00/10/31 sammy@oh.verio.com: Updated driver for 2.4 kernels, fixed problems
  *          on centris.
  */

 #include <linux/kernel.h>
 #include <linux/types.h>
 #include <linux/ctype.h>
 #include <linux/fcntl.h>
 #include <linux/interrupt.h>
 #include <linux/init.h>
 #include <linux/ioport.h>
 #include <linux/in.h>
 #include <linux/slab.h>
 #include <linux/string.h>
 #include <linux/delay.h>
 #include <linux/nubus.h>
 #include <linux/errno.h>
 #include <linux/netdevice.h>
 #include <linux/etherdevice.h>
 #include <linux/skbuff.h>
 #include <linux/module.h>
 #include <linux/bitops.h>

 #include <asm/bootinfo.h>
 #include <asm/system.h>
 #include <asm/pgtable.h>
 #include <asm/io.h>
 #include <asm/hwtest.h>
 #include <asm/dma.h>
 #include <asm/macintosh.h>
 #include <asm/macints.h>
 #include <asm/mac_via.h>

 #define SREGS_PAD(n)    u16 n;

 #include "sonic.h"

 #define SONIC_READ(reg) \
 	nubus_readl(base_addr+(reg))
 #define SONIC_WRITE(reg,val) \
 	nubus_writel((val), base_addr+(reg))
 #define sonic_read(dev, reg) \
 	nubus_readl((dev)->base_addr+(reg))
 #define sonic_write(dev, reg, val) \
 	nubus_writel((val), (dev)->base_addr+(reg))


 static int sonic_debug;
 static int sonic_version_printed;

 static int reg_offset;

 extern int mac_onboard_sonic_probe(struct net_device* dev);
 extern int mac_nubus_sonic_probe(struct net_device* dev);

 /* For onboard SONIC */
 #define ONBOARD_SONIC_REGISTERS	0x50F0A000
 #define ONBOARD_SONIC_PROM_BASE	0x50f08000

 enum macsonic_type {
 	MACSONIC_DUODOCK,
 	MACSONIC_APPLE,
 	MACSONIC_APPLE16,
 	MACSONIC_DAYNA,
 	MACSONIC_DAYNALINK
 };

 /* For the built-in SONIC in the Duo Dock */
 #define DUODOCK_SONIC_REGISTERS 0xe10000
 #define DUODOCK_SONIC_PROM_BASE 0xe12000

 /* For Apple-style NuBus SONIC */
 #define APPLE_SONIC_REGISTERS	0
 #define APPLE_SONIC_PROM_BASE	0x40000

 /* Daynalink LC SONIC */
 #define DAYNALINK_PROM_BASE 0x400000

 /* For Dayna-style NuBus SONIC (haven't seen one yet) */
 #define DAYNA_SONIC_REGISTERS   0x180000
 /* This is what OpenBSD says.  However, this is definitely in NuBus
    ROM space so we should be able to get it by walking the NuBus
    resource directories */
 #define DAYNA_SONIC_MAC_ADDR	0xffe004

 #define SONIC_READ_PROM(addr) nubus_readb(prom_addr+addr)

 struct net_device * __init macsonic_probe(int unit)
 {
 	struct net_device *dev = alloc_etherdev(0);
 	int err;

 	if (!dev)
 		return ERR_PTR(-ENOMEM);

 	if (unit >= 0)
 		sprintf(dev->name, "eth%d", unit);

  	SET_MODULE_OWNER(dev);

 	/* This will catch fatal stuff like -ENOMEM as well as success */
 	err = mac_onboard_sonic_probe(dev);
 	if (err == 0)
 		goto found;
 	if (err != -ENODEV)
 		goto out;
 	err = mac_nubus_sonic_probe(dev);
 	if (err)
 		goto out;
 found:
 	err = register_netdev(dev);
 	if (err)
 		goto out1;
 	return dev;
 out1:
 	kfree(dev->priv);
 out:
 	free_netdev(dev);
 	return ERR_PTR(err);
 }

 /*
  * For reversing the PROM address
  */

 static unsigned char nibbletab[] = {0, 8, 4, 12, 2, 10, 6, 14,
 				    1, 9, 5, 13, 3, 11, 7, 15};

 static inline void bit_reverse_addr(unsigned char addr[6])
 {
 	int i;

 	for(i = 0; i < 6; i++)
 		addr[i] = ((nibbletab[addr[i] & 0xf] << 4) |
 			   nibbletab[(addr[i] >> 4) &0xf]);
 }

 int __init macsonic_init(struct net_device* dev)
 {
 	struct sonic_local* lp = NULL;
 	int i;

 	/* Allocate the entire chunk of memory for the descriptors.
            Note that this cannot cross a 64K boundary. */
 	for (i = 0; i < 20; i++) {
 		unsigned long desc_base, desc_top;
 		if((lp = kmalloc(sizeof(struct sonic_local), GFP_KERNEL | GFP_DMA)) == NULL) {
 			printk(KERN_ERR "%s: couldn't allocate descriptor buffers\n", dev->name);
 			return -ENOMEM;
 		}

 		desc_base = (unsigned long) lp;
 		desc_top = desc_base + sizeof(struct sonic_local);
 		if ((desc_top & 0xffff) >= (desc_base & 0xffff))
 			break;
 		/* Hmm. try again (FIXME: does this actually work?) */
 		kfree(lp);
 		printk(KERN_DEBUG
 		       "%s: didn't get continguous chunk [%08lx - %08lx], trying again\n",
 		       dev->name, desc_base, desc_top);
 	}

 	if (lp == NULL) {
 		printk(KERN_ERR "%s: tried 20 times to allocate descriptor buffers, giving up.\n",
 		       dev->name);
 		return -ENOMEM;
 	}

 	dev->priv = lp;

 #if 0
 	/* this code is only here as a curiousity...   mainly, where the
 	   fuck did SONIC_BUS_SCALE come from, and what was it supposed
 	   to do?  the normal allocation works great for 32 bit stuffs..  */

 	/* Now set up the pointers to point to the appropriate places */
 	lp->cda = lp->sonic_desc;
 	lp->tda = lp->cda + (SIZEOF_SONIC_CDA * SONIC_BUS_SCALE(lp->dma_bitmode));
 	lp->rda = lp->tda + (SIZEOF_SONIC_TD * SONIC_NUM_TDS
 			     * SONIC_BUS_SCALE(lp->dma_bitmode));
 	lp->rra = lp->rda + (SIZEOF_SONIC_RD * SONIC_NUM_RDS
 			     * SONIC_BUS_SCALE(lp->dma_bitmode));

 #endif

 	memset(lp, 0, sizeof(struct sonic_local));

 	lp->cda_laddr = (unsigned int)&(lp->cda);
 	lp->tda_laddr = (unsigned int)lp->tda;
 	lp->rra_laddr = (unsigned int)lp->rra;
 	lp->rda_laddr = (unsigned int)lp->rda;

 	/* FIXME, maybe we should use skbs */
 	if ((lp->rba = (char *)
 	     kmalloc(SONIC_NUM_RRS * SONIC_RBSIZE, GFP_KERNEL | GFP_DMA)) == NULL) {
 		printk(KERN_ERR "%s: couldn't allocate receive buffers\n", dev->name);
 		dev->priv = NULL;
 		kfree(lp);
 		return -ENOMEM;
 	}

 	lp->rba_laddr = (unsigned int)lp->rba;

 	{
 		int rs, ds;

 		/* almost always 12*4096, but let's not take chances */
 		rs = ((SONIC_NUM_RRS * SONIC_RBSIZE + 4095) / 4096) * 4096;
 		/* almost always under a page, but let's not take chances */
 		ds = ((sizeof(struct sonic_local) + 4095) / 4096) * 4096;
 		kernel_set_cachemode(lp->rba, rs, IOMAP_NOCACHE_SER);
 		kernel_set_cachemode(lp, ds, IOMAP_NOCACHE_SER);
 	}

 #if 0
 	flush_cache_all();
 #endif

 	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(dev, SONIC_CRCT, 0xffff);
 	sonic_write(dev, SONIC_FAET, 0xffff);
 	sonic_write(dev, SONIC_MPT, 0xffff);

 	return 0;
 }

 int __init mac_onboard_sonic_ethernet_addr(struct net_device* dev)
 {
 	const int prom_addr = ONBOARD_SONIC_PROM_BASE;
 	int i;

 	/* On NuBus boards we can sometimes look in the ROM resources.
 	   No such luck for comm-slot/onboard. */
 	for(i = 0; i < 6; i++)
 		dev->dev_addr[i] = SONIC_READ_PROM(i);

 	/* Most of the time, the address is bit-reversed.  The NetBSD
 	   source has a rather long and detailed historical account of
 	   why this is so. */
 	if (memcmp(dev->dev_addr, "\x08\x00\x07", 3) &&
 	    memcmp(dev->dev_addr, "\x00\xA0\x40", 3) &&
 	    memcmp(dev->dev_addr, "\x00\x05\x02", 3))
 		bit_reverse_addr(dev->dev_addr);
 	else
 		return 0;

 	/* If we still have what seems to be a bogus address, we'll
            look in the CAM.  The top entry should be ours. */
 	/* Danger! This only works if MacOS has already initialized
            the card... */
 	if (memcmp(dev->dev_addr, "\x08\x00\x07", 3) &&
 	    memcmp(dev->dev_addr, "\x00\xA0\x40", 3) &&
 	    memcmp(dev->dev_addr, "\x00\x05\x02", 3))
 	{
 		unsigned short val;

 		printk(KERN_INFO "macsonic: PROM seems to be wrong, trying CAM entry 15\n");

 		sonic_write(dev, SONIC_CMD, SONIC_CR_RST);
 		sonic_write(dev, SONIC_CEP, 15);

 		val = sonic_read(dev, SONIC_CAP2);
 		dev->dev_addr[5] = val >> 8;
 		dev->dev_addr[4] = val & 0xff;
 		val = sonic_read(dev, SONIC_CAP1);
 		dev->dev_addr[3] = val >> 8;
 		dev->dev_addr[2] = val & 0xff;
 		val = sonic_read(dev, SONIC_CAP0);
 		dev->dev_addr[1] = val >> 8;
 		dev->dev_addr[0] = val & 0xff;

 		printk(KERN_INFO "HW Address from CAM 15: ");
 		for (i = 0; i < 6; i++) {
 			printk("%2.2x", dev->dev_addr[i]);
 			if (i < 5)
 				printk(":");
 		}
 		printk("\n");
 	} else return 0;

 	if (memcmp(dev->dev_addr, "\x08\x00\x07", 3) &&
 	    memcmp(dev->dev_addr, "\x00\xA0\x40", 3) &&
 	    memcmp(dev->dev_addr, "\x00\x05\x02", 3))
 	{
 		/*
 		 * Still nonsense ... messed up someplace!
 		 */
 		printk(KERN_ERR "macsonic: ERROR (INVALID MAC)\n");
 		return -EIO;
 	} else return 0;
 }

 int __init mac_onboard_sonic_probe(struct net_device* dev)
 {
 	/* Bwahahaha */
 	static int once_is_more_than_enough;
 	int i;
 	int dma_bitmode;

 	if (once_is_more_than_enough)
 		return -ENODEV;
 	once_is_more_than_enough = 1;

 	if (!MACH_IS_MAC)
 		return -ENODEV;

 	printk(KERN_INFO "Checking for internal Macintosh ethernet (SONIC).. ");

 	if (macintosh_config->ether_type != MAC_ETHER_SONIC)
 	{
 		printk("none.\n");
 		return -ENODEV;
 	}

 	/* Bogus probing, on the models which may or may not have
 	   Ethernet (BTW, the Ethernet *is* always at the same
 	   address, and nothing else lives there, at least if Apple's
 	   documentation is to be believed) */
 	if (macintosh_config->ident == MAC_MODEL_Q630 ||
 	    macintosh_config->ident == MAC_MODEL_P588 ||
 	    macintosh_config->ident == MAC_MODEL_C610) {
 		unsigned long flags;
 		int card_present;

 		local_irq_save(flags);
 		card_present = hwreg_present((void*)ONBOARD_SONIC_REGISTERS);
 		local_irq_restore(flags);

 		if (!card_present) {
 			printk("none.\n");
 			return -ENODEV;
 		}
 	}

 	printk("yes\n");

 	/* Danger!  My arms are flailing wildly!  You *must* set this
            before using sonic_read() */

 	dev->base_addr = ONBOARD_SONIC_REGISTERS;
 	if (via_alt_mapping)
 		dev->irq = IRQ_AUTO_3;
 	else
 		dev->irq = IRQ_NUBUS_9;

 	if (!sonic_version_printed) {
 		printk(KERN_INFO "%s", version);
 		sonic_version_printed = 1;
 	}
 	printk(KERN_INFO "%s: onboard / comm-slot SONIC at 0x%08lx\n",
 	       dev->name, dev->base_addr);

 	/* Now do a song and dance routine in an attempt to determine
            the bus width */

 	/* The PowerBook's SONIC is 16 bit always. */
 	if (macintosh_config->ident == MAC_MODEL_PB520) {
 		reg_offset = 0;
 		dma_bitmode = 0;
 	} else if (macintosh_config->ident == MAC_MODEL_C610) {
 		reg_offset = 0;
 		dma_bitmode = 1;
 	} else {
 		/* Some of the comm-slot cards are 16 bit.  But some
                    of them are not.  The 32-bit cards use offset 2 and
                    pad with zeroes or sometimes ones (I think...)
                    Therefore, if we try offset 0 and get a silicon
                    revision of 0, we assume 16 bit. */
 		int sr;

 		/* Technically this is not necessary since we zeroed
                    it above */
 		reg_offset = 0;
 		dma_bitmode = 0;
 		sr = sonic_read(dev, SONIC_SR);
 		if (sr == 0 || sr == 0xffff) {
 			reg_offset = 2;
 			/* 83932 is 0x0004, 83934 is 0x0100 or 0x0101 */
 			sr = sonic_read(dev, SONIC_SR);
 			dma_bitmode = 1;

 		}
 		printk(KERN_INFO
 		       "%s: revision 0x%04x, using %d bit DMA and register offset %d\n",
 		       dev->name, sr, dma_bitmode?32:16, reg_offset);
 	}


 	/* this carries my sincere apologies -- by the time I got to updating
 	   the driver, support for "reg_offsets" appeares nowhere in the sonic
 	   code, going back for over a year.  Fortunately, my Mac does't seem
 	   to use whatever this was.

 	   If you know how this is supposed to be implemented, either fix it,
 	   or contact me (sammy@oh.verio.com) to explain what it is. --Sam */

 	if(reg_offset) {
 		printk("%s: register offset unsupported.  please fix this if you know what it is.\n", dev->name);
 		return -ENODEV;
 	}

 	/* Software reset, then initialize control registers. */
 	sonic_write(dev, SONIC_CMD, SONIC_CR_RST);
 	sonic_write(dev, SONIC_DCR, SONIC_DCR_BMS |
 		    SONIC_DCR_RFT1 | SONIC_DCR_TFT0 | SONIC_DCR_EXBUS |
 		    (dma_bitmode ? SONIC_DCR_DW : 0));

 	/* This *must* be written back to in order to restore the
            extended programmable output bits */
 	sonic_write(dev, SONIC_DCR2, 0);

 	/* Clear *and* disable interrupts to be on the safe side */
 	sonic_write(dev, SONIC_ISR,0x7fff);
 	sonic_write(dev, SONIC_IMR,0);

 	/* Now look for the MAC address. */
 	if (mac_onboard_sonic_ethernet_addr(dev) != 0)
 		return -ENODEV;

 	printk(KERN_INFO "MAC ");
 	for (i = 0; i < 6; i++) {
 		printk("%2.2x", dev->dev_addr[i]);
 		if (i < 5)
 			printk(":");
 	}

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

 	/* Shared init code */
 	return macsonic_init(dev);
 }

 int __init mac_nubus_sonic_ethernet_addr(struct net_device* dev,
 					 unsigned long prom_addr,
 					 int id)
 {
 	int i;
 	for(i = 0; i < 6; i++)
 		dev->dev_addr[i] = SONIC_READ_PROM(i);
 	/* For now we are going to assume that they're all bit-reversed */
 	bit_reverse_addr(dev->dev_addr);

 	return 0;
 }

 int __init macsonic_ident(struct nubus_dev* ndev)
 {
 	if (ndev->dr_hw == NUBUS_DRHW_ASANTE_LC &&
 	    ndev->dr_sw == NUBUS_DRSW_SONIC_LC)
 		return MACSONIC_DAYNALINK;
 	if (ndev->dr_hw == NUBUS_DRHW_SONIC &&
 	    ndev->dr_sw == NUBUS_DRSW_APPLE) {
 		/* There has to be a better way to do this... */
 		if (strstr(ndev->board->name, "DuoDock"))
 			return MACSONIC_DUODOCK;
 		else
 			return MACSONIC_APPLE;
 	}
 	return -1;
 }

 int __init mac_nubus_sonic_probe(struct net_device* dev)
 {
 	static int slots;
 	struct nubus_dev* ndev = NULL;
 	unsigned long base_addr, prom_addr;
 	u16 sonic_dcr;
 	int id;
 	int i;
 	int dma_bitmode;

 	/* Find the first SONIC that hasn't been initialized already */
 	while ((ndev = nubus_find_type(NUBUS_CAT_NETWORK,
 				       NUBUS_TYPE_ETHERNET, ndev)) != NULL)
 	{
 		/* Have we seen it already? */
 		if (slots & (1<<ndev->board->slot))
 			continue;
 		slots |= 1<<ndev->board->slot;

 		/* Is it one of ours? */
 		if ((id = macsonic_ident(ndev)) != -1)
 			break;
 	}

 	if (ndev == NULL)
 		return -ENODEV;

 	switch (id) {
 	case MACSONIC_DUODOCK:
 		base_addr = ndev->board->slot_addr + DUODOCK_SONIC_REGISTERS;
 		prom_addr = ndev->board->slot_addr + DUODOCK_SONIC_PROM_BASE;
 		sonic_dcr = SONIC_DCR_EXBUS | SONIC_DCR_RFT0 | SONIC_DCR_RFT1
 			| SONIC_DCR_TFT0;
 		reg_offset = 2;
 		dma_bitmode = 1;
 		break;
 	case MACSONIC_APPLE:
 		base_addr = ndev->board->slot_addr + APPLE_SONIC_REGISTERS;
 		prom_addr = ndev->board->slot_addr + APPLE_SONIC_PROM_BASE;
 		sonic_dcr = SONIC_DCR_BMS | SONIC_DCR_RFT1 | SONIC_DCR_TFT0;
 		reg_offset = 0;
 		dma_bitmode = 1;
 		break;
 	case MACSONIC_APPLE16:
 		base_addr = ndev->board->slot_addr + APPLE_SONIC_REGISTERS;
 		prom_addr = ndev->board->slot_addr + APPLE_SONIC_PROM_BASE;
 		sonic_dcr = SONIC_DCR_EXBUS
  			| SONIC_DCR_RFT1 | SONIC_DCR_TFT0
 			| SONIC_DCR_PO1 | SONIC_DCR_BMS;
 		reg_offset = 0;
 		dma_bitmode = 0;
 		break;
 	case MACSONIC_DAYNALINK:
 		base_addr = ndev->board->slot_addr + APPLE_SONIC_REGISTERS;
 		prom_addr = ndev->board->slot_addr + DAYNALINK_PROM_BASE;
 		sonic_dcr = SONIC_DCR_RFT1 | SONIC_DCR_TFT0
 			| SONIC_DCR_PO1 | SONIC_DCR_BMS;
 		reg_offset = 0;
 		dma_bitmode = 0;
 		break;
 	case MACSONIC_DAYNA:
 		base_addr = ndev->board->slot_addr + DAYNA_SONIC_REGISTERS;
 		prom_addr = ndev->board->slot_addr + DAYNA_SONIC_MAC_ADDR;
 		sonic_dcr = SONIC_DCR_BMS
 			| SONIC_DCR_RFT1 | SONIC_DCR_TFT0 | SONIC_DCR_PO1;
 		reg_offset = 0;
 		dma_bitmode = 0;
 		break;
 	default:
 		printk(KERN_ERR "macsonic: WTF, id is %d\n", id);
 		return -ENODEV;
 	}

 	/* Danger!  My arms are flailing wildly!  You *must* set this
            before using sonic_read() */
 	dev->base_addr = base_addr;
 	dev->irq = SLOT2IRQ(ndev->board->slot);

 	if (!sonic_version_printed) {
 		printk(KERN_INFO "%s", version);
 		sonic_version_printed = 1;
 	}
 	printk(KERN_INFO "%s: %s in slot %X\n",
 	       dev->name, ndev->board->name, ndev->board->slot);
 	printk(KERN_INFO "%s: revision 0x%04x, using %d bit DMA and register offset %d\n",
 	       dev->name, sonic_read(dev, SONIC_SR), dma_bitmode?32:16, reg_offset);

 	if(reg_offset) {
 		printk("%s: register offset unsupported.  please fix this if you know what it is.\n", dev->name);
 		return -ENODEV;
 	}

 	/* Software reset, then initialize control registers. */
 	sonic_write(dev, SONIC_CMD, SONIC_CR_RST);
 	sonic_write(dev, SONIC_DCR, sonic_dcr
 		    | (dma_bitmode ? SONIC_DCR_DW : 0));

 	/* Clear *and* disable interrupts to be on the safe side */
 	sonic_write(dev, SONIC_ISR,0x7fff);
 	sonic_write(dev, SONIC_IMR,0);

 	/* Now look for the MAC address. */
 	if (mac_nubus_sonic_ethernet_addr(dev, prom_addr, id) != 0)
 		return -ENODEV;

 	printk(KERN_INFO "MAC ");
 	for (i = 0; i < 6; i++) {
 		printk("%2.2x", dev->dev_addr[i]);
 		if (i < 5)
 			printk(":");
 	}
 	printk(" IRQ %d\n", dev->irq);

 	/* Shared init code */
 	return macsonic_init(dev);
 }

 #ifdef MODULE
 static struct net_device *dev_macsonic;

 MODULE_PARM(sonic_debug, "i");
 MODULE_PARM_DESC(sonic_debug, "macsonic debug level (1-4)");

 int
 init_module(void)
 {
         dev_macsonic = macsonic_probe(-1);
 	if (IS_ERR(dev_macsonic)) {
                 printk(KERN_WARNING "macsonic.c: No card found\n");
 		return PTR_ERR(dev_macsonic);
 	}
 	return 0;
 }

 void
 cleanup_module(void)
 {
 	unregister_netdev(dev_macsonic);
 	kfree(dev_macsonic->priv);
 	free_netdev(dev_macsonic);
 }
 #endif /* MODULE */


 #define vdma_alloc(foo, bar) ((u32)foo)
 #define vdma_free(baz)
 #define sonic_chiptomem(bat) (bat)
 #define PHYSADDR(quux) (quux)
 #define CPHYSADDR(quux) (quux)

 #define sonic_request_irq       request_irq
 #define sonic_free_irq          free_irq

 #include "sonic.c"

 /*
  * Local variables:
  *  compile-command: "m68k-linux-gcc -D__KERNEL__ -I../../include -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -pipe -fno-strength-reduce -ffixed-a2 -DMODULE -DMODVERSIONS -include ../../include/linux/modversions.h   -c -o macsonic.o macsonic.c"
  *  version-control: t
  *  kept-new-versions: 5
  *  c-indent-level: 8
  *  tab-width: 8
  * End:
  *
  */
	/*
	* macsonic.c
	*
	* (C) 1998 Alan Cox
	*
	* Debugging Andreas Ehliar, Michael Schmitz
	*
	* Based on code
	* (C) 1996 by Thomas Bogendoerfer (tsbogend@bigbug.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 Mac onboard Sonic ethernet chip.
	*
	* 98/12/21 MSch: judged from tests on Q800, it's basically working,
	* but eating up both receive and transmit resources
	* and duplicating packets. Needs more testing.
	*
	* 99/01/03 MSch: upgraded to version 0.92 of the core driver, fixed.
	*
	* 00/10/31 sammy@oh.verio.com: Updated driver for 2.4 kernels, fixed problems
	* on centris.
	*/

	#include <linux/kernel.h>
	#include <linux/types.h>
	#include <linux/ctype.h>
	#include <linux/fcntl.h>
	#include <linux/interrupt.h>
	#include <linux/init.h>
	#include <linux/ioport.h>
	#include <linux/in.h>
	#include <linux/slab.h>
	#include <linux/string.h>
	#include <linux/delay.h>
	#include <linux/nubus.h>
	#include <linux/errno.h>
	#include <linux/netdevice.h>
	#include <linux/etherdevice.h>
	#include <linux/skbuff.h>
	#include <linux/module.h>
	#include <linux/bitops.h>

	#include <asm/bootinfo.h>
	#include <asm/system.h>
	#include <asm/pgtable.h>
	#include <asm/io.h>
	#include <asm/hwtest.h>
	#include <asm/dma.h>
	#include <asm/macintosh.h>
	#include <asm/macints.h>
	#include <asm/mac_via.h>

	#define SREGS_PAD(n) u16 n;

	#include "sonic.h"

	#define SONIC_READ(reg) \
	nubus_readl(base_addr+(reg))
	#define SONIC_WRITE(reg,val) \
	nubus_writel((val), base_addr+(reg))
	#define sonic_read(dev, reg) \
	nubus_readl((dev)->base_addr+(reg))
	#define sonic_write(dev, reg, val) \
	nubus_writel((val), (dev)->base_addr+(reg))


	static int sonic_debug;
	static int sonic_version_printed;

	static int reg_offset;

	extern int mac_onboard_sonic_probe(struct net_device* dev);
	extern int mac_nubus_sonic_probe(struct net_device* dev);

	/* For onboard SONIC */
	#define ONBOARD_SONIC_REGISTERS 0x50F0A000
	#define ONBOARD_SONIC_PROM_BASE 0x50f08000

	enum macsonic_type {
	MACSONIC_DUODOCK,
	MACSONIC_APPLE,
	MACSONIC_APPLE16,
	MACSONIC_DAYNA,
	MACSONIC_DAYNALINK
	};

	/* For the built-in SONIC in the Duo Dock */
	#define DUODOCK_SONIC_REGISTERS 0xe10000
	#define DUODOCK_SONIC_PROM_BASE 0xe12000

	/* For Apple-style NuBus SONIC */
	#define APPLE_SONIC_REGISTERS 0
	#define APPLE_SONIC_PROM_BASE 0x40000

	/* Daynalink LC SONIC */
	#define DAYNALINK_PROM_BASE 0x400000

	/* For Dayna-style NuBus SONIC (haven't seen one yet) */
	#define DAYNA_SONIC_REGISTERS 0x180000
	/* This is what OpenBSD says. However, this is definitely in NuBus
	ROM space so we should be able to get it by walking the NuBus
	resource directories */
	#define DAYNA_SONIC_MAC_ADDR 0xffe004

	#define SONIC_READ_PROM(addr) nubus_readb(prom_addr+addr)

	struct net_device * __init macsonic_probe(int unit)
	{
	struct net_device *dev = alloc_etherdev(0);
	int err;

	if (!dev)
	return ERR_PTR(-ENOMEM);

	if (unit >= 0)
	sprintf(dev->name, "eth%d", unit);

	SET_MODULE_OWNER(dev);

	/* This will catch fatal stuff like -ENOMEM as well as success */
	err = mac_onboard_sonic_probe(dev);
	if (err == 0)
	goto found;
	if (err != -ENODEV)
	goto out;
	err = mac_nubus_sonic_probe(dev);
	if (err)
	goto out;
	found:
	err = register_netdev(dev);
	if (err)
	goto out1;
	return dev;
	out1:
	kfree(dev->priv);
	out:
	free_netdev(dev);
	return ERR_PTR(err);
	}

	/*
	* For reversing the PROM address
	*/

	static unsigned char nibbletab[] = {0, 8, 4, 12, 2, 10, 6, 14,
	1, 9, 5, 13, 3, 11, 7, 15};

	static inline void bit_reverse_addr(unsigned char addr[6])
	{
	int i;

	for(i = 0; i < 6; i++)
	addr[i] = ((nibbletab[addr[i] & 0xf] << 4) \|
	nibbletab[(addr[i] >> 4) &0xf]);
	}

	int __init macsonic_init(struct net_device* dev)
	{
	struct sonic_local* lp = NULL;
	int i;

	/* Allocate the entire chunk of memory for the descriptors.
	Note that this cannot cross a 64K boundary. */
	for (i = 0; i < 20; i++) {
	unsigned long desc_base, desc_top;
	if((lp = kmalloc(sizeof(struct sonic_local), GFP_KERNEL \| GFP_DMA)) == NULL) {
	printk(KERN_ERR "%s: couldn't allocate descriptor buffers\n", dev->name);
	return -ENOMEM;
	}

	desc_base = (unsigned long) lp;
	desc_top = desc_base + sizeof(struct sonic_local);
	if ((desc_top & 0xffff) >= (desc_base & 0xffff))
	break;
	/* Hmm. try again (FIXME: does this actually work?) */
	kfree(lp);
	printk(KERN_DEBUG
	"%s: didn't get continguous chunk [%08lx - %08lx], trying again\n",
	dev->name, desc_base, desc_top);
	}

	if (lp == NULL) {
	printk(KERN_ERR "%s: tried 20 times to allocate descriptor buffers, giving up.\n",
	dev->name);
	return -ENOMEM;
	}

	dev->priv = lp;

	#if 0
	/* this code is only here as a curiousity... mainly, where the
	fuck did SONIC_BUS_SCALE come from, and what was it supposed
	to do? the normal allocation works great for 32 bit stuffs.. */

	/* Now set up the pointers to point to the appropriate places */
	lp->cda = lp->sonic_desc;
	lp->tda = lp->cda + (SIZEOF_SONIC_CDA * SONIC_BUS_SCALE(lp->dma_bitmode));
	lp->rda = lp->tda + (SIZEOF_SONIC_TD * SONIC_NUM_TDS
	* SONIC_BUS_SCALE(lp->dma_bitmode));
	lp->rra = lp->rda + (SIZEOF_SONIC_RD * SONIC_NUM_RDS
	* SONIC_BUS_SCALE(lp->dma_bitmode));

	#endif

	memset(lp, 0, sizeof(struct sonic_local));

	lp->cda_laddr = (unsigned int)&(lp->cda);
	lp->tda_laddr = (unsigned int)lp->tda;
	lp->rra_laddr = (unsigned int)lp->rra;
	lp->rda_laddr = (unsigned int)lp->rda;

	/* FIXME, maybe we should use skbs */
	if ((lp->rba = (char *)
	kmalloc(SONIC_NUM_RRS * SONIC_RBSIZE, GFP_KERNEL \| GFP_DMA)) == NULL) {
	printk(KERN_ERR "%s: couldn't allocate receive buffers\n", dev->name);
	dev->priv = NULL;
	kfree(lp);
	return -ENOMEM;
	}

	lp->rba_laddr = (unsigned int)lp->rba;

	{
	int rs, ds;

	/* almost always 124096, but let's not take chances /
	rs = ((SONIC_NUM_RRS * SONIC_RBSIZE + 4095) / 4096) * 4096;
	/* almost always under a page, but let's not take chances */
	ds = ((sizeof(struct sonic_local) + 4095) / 4096) * 4096;
	kernel_set_cachemode(lp->rba, rs, IOMAP_NOCACHE_SER);
	kernel_set_cachemode(lp, ds, IOMAP_NOCACHE_SER);
	}

	#if 0
	flush_cache_all();
	#endif

	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(dev, SONIC_CRCT, 0xffff);
	sonic_write(dev, SONIC_FAET, 0xffff);
	sonic_write(dev, SONIC_MPT, 0xffff);

	return 0;
	}

	int __init mac_onboard_sonic_ethernet_addr(struct net_device* dev)
	{
	const int prom_addr = ONBOARD_SONIC_PROM_BASE;
	int i;

	/* On NuBus boards we can sometimes look in the ROM resources.
	No such luck for comm-slot/onboard. */
	for(i = 0; i < 6; i++)
	dev->dev_addr[i] = SONIC_READ_PROM(i);

	/* Most of the time, the address is bit-reversed. The NetBSD
	source has a rather long and detailed historical account of
	why this is so. */
	if (memcmp(dev->dev_addr, "\x08\x00\x07", 3) &&
	memcmp(dev->dev_addr, "\x00\xA0\x40", 3) &&
	memcmp(dev->dev_addr, "\x00\x05\x02", 3))
	bit_reverse_addr(dev->dev_addr);
	else
	return 0;

	/* If we still have what seems to be a bogus address, we'll
	look in the CAM. The top entry should be ours. */
	/* Danger! This only works if MacOS has already initialized
	the card... */
	if (memcmp(dev->dev_addr, "\x08\x00\x07", 3) &&
	memcmp(dev->dev_addr, "\x00\xA0\x40", 3) &&
	memcmp(dev->dev_addr, "\x00\x05\x02", 3))
	{
	unsigned short val;

	printk(KERN_INFO "macsonic: PROM seems to be wrong, trying CAM entry 15\n");

	sonic_write(dev, SONIC_CMD, SONIC_CR_RST);
	sonic_write(dev, SONIC_CEP, 15);

	val = sonic_read(dev, SONIC_CAP2);
	dev->dev_addr[5] = val >> 8;
	dev->dev_addr[4] = val & 0xff;
	val = sonic_read(dev, SONIC_CAP1);
	dev->dev_addr[3] = val >> 8;
	dev->dev_addr[2] = val & 0xff;
	val = sonic_read(dev, SONIC_CAP0);
	dev->dev_addr[1] = val >> 8;
	dev->dev_addr[0] = val & 0xff;

	printk(KERN_INFO "HW Address from CAM 15: ");
	for (i = 0; i < 6; i++) {
	printk("%2.2x", dev->dev_addr[i]);
	if (i < 5)
	printk(":");
	}
	printk("\n");
	} else return 0;

	if (memcmp(dev->dev_addr, "\x08\x00\x07", 3) &&
	memcmp(dev->dev_addr, "\x00\xA0\x40", 3) &&
	memcmp(dev->dev_addr, "\x00\x05\x02", 3))
	{
	/*
	* Still nonsense ... messed up someplace!
	*/
	printk(KERN_ERR "macsonic: ERROR (INVALID MAC)\n");
	return -EIO;
	} else return 0;
	}

	int __init mac_onboard_sonic_probe(struct net_device* dev)
	{
	/* Bwahahaha */
	static int once_is_more_than_enough;
	int i;
	int dma_bitmode;

	if (once_is_more_than_enough)
	return -ENODEV;
	once_is_more_than_enough = 1;

	if (!MACH_IS_MAC)
	return -ENODEV;

	printk(KERN_INFO "Checking for internal Macintosh ethernet (SONIC).. ");

	if (macintosh_config->ether_type != MAC_ETHER_SONIC)
	{
	printk("none.\n");
	return -ENODEV;
	}

	/* Bogus probing, on the models which may or may not have
	Ethernet (BTW, the Ethernet is always at the same
	address, and nothing else lives there, at least if Apple's
	documentation is to be believed) */
	if (macintosh_config->ident == MAC_MODEL_Q630 \|\|
	macintosh_config->ident == MAC_MODEL_P588 \|\|
	macintosh_config->ident == MAC_MODEL_C610) {
	unsigned long flags;
	int card_present;

	local_irq_save(flags);
	card_present = hwreg_present((void*)ONBOARD_SONIC_REGISTERS);
	local_irq_restore(flags);

	if (!card_present) {
	printk("none.\n");
	return -ENODEV;
	}
	}

	printk("yes\n");

	/* Danger! My arms are flailing wildly! You must set this
	before using sonic_read() */

	dev->base_addr = ONBOARD_SONIC_REGISTERS;
	if (via_alt_mapping)
	dev->irq = IRQ_AUTO_3;
	else
	dev->irq = IRQ_NUBUS_9;

	if (!sonic_version_printed) {
	printk(KERN_INFO "%s", version);
	sonic_version_printed = 1;
	}
	printk(KERN_INFO "%s: onboard / comm-slot SONIC at 0x%08lx\n",
	dev->name, dev->base_addr);

	/* Now do a song and dance routine in an attempt to determine
	the bus width */

	/* The PowerBook's SONIC is 16 bit always. */
	if (macintosh_config->ident == MAC_MODEL_PB520) {
	reg_offset = 0;
	dma_bitmode = 0;
	} else if (macintosh_config->ident == MAC_MODEL_C610) {
	reg_offset = 0;
	dma_bitmode = 1;
	} else {
	/* Some of the comm-slot cards are 16 bit. But some
	of them are not. The 32-bit cards use offset 2 and
	pad with zeroes or sometimes ones (I think...)
	Therefore, if we try offset 0 and get a silicon
	revision of 0, we assume 16 bit. */
	int sr;

	/* Technically this is not necessary since we zeroed
	it above */
	reg_offset = 0;
	dma_bitmode = 0;
	sr = sonic_read(dev, SONIC_SR);
	if (sr == 0 \|\| sr == 0xffff) {
	reg_offset = 2;
	/* 83932 is 0x0004, 83934 is 0x0100 or 0x0101 */
	sr = sonic_read(dev, SONIC_SR);
	dma_bitmode = 1;

	}
	printk(KERN_INFO
	"%s: revision 0x%04x, using %d bit DMA and register offset %d\n",
	dev->name, sr, dma_bitmode?32:16, reg_offset);
	}


	/* this carries my sincere apologies -- by the time I got to updating
	the driver, support for "reg_offsets" appeares nowhere in the sonic
	code, going back for over a year. Fortunately, my Mac does't seem
	to use whatever this was.

	If you know how this is supposed to be implemented, either fix it,
	or contact me (sammy@oh.verio.com) to explain what it is. --Sam */

	if(reg_offset) {
	printk("%s: register offset unsupported. please fix this if you know what it is.\n", dev->name);
	return -ENODEV;
	}

	/* Software reset, then initialize control registers. */
	sonic_write(dev, SONIC_CMD, SONIC_CR_RST);
	sonic_write(dev, SONIC_DCR, SONIC_DCR_BMS \|
	SONIC_DCR_RFT1 \| SONIC_DCR_TFT0 \| SONIC_DCR_EXBUS \|
	(dma_bitmode ? SONIC_DCR_DW : 0));

	/* This must be written back to in order to restore the
	extended programmable output bits */
	sonic_write(dev, SONIC_DCR2, 0);

	/* Clear and disable interrupts to be on the safe side */
	sonic_write(dev, SONIC_ISR,0x7fff);
	sonic_write(dev, SONIC_IMR,0);

	/* Now look for the MAC address. */
	if (mac_onboard_sonic_ethernet_addr(dev) != 0)
	return -ENODEV;

	printk(KERN_INFO "MAC ");
	for (i = 0; i < 6; i++) {
	printk("%2.2x", dev->dev_addr[i]);
	if (i < 5)
	printk(":");
	}

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

	/* Shared init code */
	return macsonic_init(dev);
	}

	int __init mac_nubus_sonic_ethernet_addr(struct net_device* dev,
	unsigned long prom_addr,
	int id)
	{
	int i;
	for(i = 0; i < 6; i++)
	dev->dev_addr[i] = SONIC_READ_PROM(i);
	/* For now we are going to assume that they're all bit-reversed */
	bit_reverse_addr(dev->dev_addr);

	return 0;
	}

	int __init macsonic_ident(struct nubus_dev* ndev)
	{
	if (ndev->dr_hw == NUBUS_DRHW_ASANTE_LC &&
	ndev->dr_sw == NUBUS_DRSW_SONIC_LC)
	return MACSONIC_DAYNALINK;
	if (ndev->dr_hw == NUBUS_DRHW_SONIC &&
	ndev->dr_sw == NUBUS_DRSW_APPLE) {
	/* There has to be a better way to do this... */
	if (strstr(ndev->board->name, "DuoDock"))
	return MACSONIC_DUODOCK;
	else
	return MACSONIC_APPLE;
	}
	return -1;
	}

	int __init mac_nubus_sonic_probe(struct net_device* dev)
	{
	static int slots;
	struct nubus_dev* ndev = NULL;
	unsigned long base_addr, prom_addr;
	u16 sonic_dcr;
	int id;
	int i;
	int dma_bitmode;

	/* Find the first SONIC that hasn't been initialized already */
	while ((ndev = nubus_find_type(NUBUS_CAT_NETWORK,
	NUBUS_TYPE_ETHERNET, ndev)) != NULL)
	{
	/* Have we seen it already? */
	if (slots & (1<<ndev->board->slot))
	continue;
	slots \|= 1<<ndev->board->slot;

	/* Is it one of ours? */
	if ((id = macsonic_ident(ndev)) != -1)
	break;
	}

	if (ndev == NULL)
	return -ENODEV;

	switch (id) {
	case MACSONIC_DUODOCK:
	base_addr = ndev->board->slot_addr + DUODOCK_SONIC_REGISTERS;
	prom_addr = ndev->board->slot_addr + DUODOCK_SONIC_PROM_BASE;
	sonic_dcr = SONIC_DCR_EXBUS \| SONIC_DCR_RFT0 \| SONIC_DCR_RFT1
	\| SONIC_DCR_TFT0;
	reg_offset = 2;
	dma_bitmode = 1;
	break;
	case MACSONIC_APPLE:
	base_addr = ndev->board->slot_addr + APPLE_SONIC_REGISTERS;
	prom_addr = ndev->board->slot_addr + APPLE_SONIC_PROM_BASE;
	sonic_dcr = SONIC_DCR_BMS \| SONIC_DCR_RFT1 \| SONIC_DCR_TFT0;
	reg_offset = 0;
	dma_bitmode = 1;
	break;
	case MACSONIC_APPLE16:
	base_addr = ndev->board->slot_addr + APPLE_SONIC_REGISTERS;
	prom_addr = ndev->board->slot_addr + APPLE_SONIC_PROM_BASE;
	sonic_dcr = SONIC_DCR_EXBUS
	\| SONIC_DCR_RFT1 \| SONIC_DCR_TFT0
	\| SONIC_DCR_PO1 \| SONIC_DCR_BMS;
	reg_offset = 0;
	dma_bitmode = 0;
	break;
	case MACSONIC_DAYNALINK:
	base_addr = ndev->board->slot_addr + APPLE_SONIC_REGISTERS;
	prom_addr = ndev->board->slot_addr + DAYNALINK_PROM_BASE;
	sonic_dcr = SONIC_DCR_RFT1 \| SONIC_DCR_TFT0
	\| SONIC_DCR_PO1 \| SONIC_DCR_BMS;
	reg_offset = 0;
	dma_bitmode = 0;
	break;
	case MACSONIC_DAYNA:
	base_addr = ndev->board->slot_addr + DAYNA_SONIC_REGISTERS;
	prom_addr = ndev->board->slot_addr + DAYNA_SONIC_MAC_ADDR;
	sonic_dcr = SONIC_DCR_BMS
	\| SONIC_DCR_RFT1 \| SONIC_DCR_TFT0 \| SONIC_DCR_PO1;
	reg_offset = 0;
	dma_bitmode = 0;
	break;
	default:
	printk(KERN_ERR "macsonic: WTF, id is %d\n", id);
	return -ENODEV;
	}

	/* Danger! My arms are flailing wildly! You must set this
	before using sonic_read() */
	dev->base_addr = base_addr;
	dev->irq = SLOT2IRQ(ndev->board->slot);

	if (!sonic_version_printed) {
	printk(KERN_INFO "%s", version);
	sonic_version_printed = 1;
	}
	printk(KERN_INFO "%s: %s in slot %X\n",
	dev->name, ndev->board->name, ndev->board->slot);
	printk(KERN_INFO "%s: revision 0x%04x, using %d bit DMA and register offset %d\n",
	dev->name, sonic_read(dev, SONIC_SR), dma_bitmode?32:16, reg_offset);

	if(reg_offset) {
	printk("%s: register offset unsupported. please fix this if you know what it is.\n", dev->name);
	return -ENODEV;
	}

	/* Software reset, then initialize control registers. */
	sonic_write(dev, SONIC_CMD, SONIC_CR_RST);
	sonic_write(dev, SONIC_DCR, sonic_dcr
	\| (dma_bitmode ? SONIC_DCR_DW : 0));

	/* Clear and disable interrupts to be on the safe side */
	sonic_write(dev, SONIC_ISR,0x7fff);
	sonic_write(dev, SONIC_IMR,0);

	/* Now look for the MAC address. */
	if (mac_nubus_sonic_ethernet_addr(dev, prom_addr, id) != 0)
	return -ENODEV;

	printk(KERN_INFO "MAC ");
	for (i = 0; i < 6; i++) {
	printk("%2.2x", dev->dev_addr[i]);
	if (i < 5)
	printk(":");
	}
	printk(" IRQ %d\n", dev->irq);

	/* Shared init code */
	return macsonic_init(dev);
	}

	#ifdef MODULE
	static struct net_device *dev_macsonic;

	MODULE_PARM(sonic_debug, "i");
	MODULE_PARM_DESC(sonic_debug, "macsonic debug level (1-4)");

	int
	init_module(void)
	{
	dev_macsonic = macsonic_probe(-1);
	if (IS_ERR(dev_macsonic)) {
	printk(KERN_WARNING "macsonic.c: No card found\n");
	return PTR_ERR(dev_macsonic);
	}
	return 0;
	}

	void
	cleanup_module(void)
	{
	unregister_netdev(dev_macsonic);
	kfree(dev_macsonic->priv);
	free_netdev(dev_macsonic);
	}
	#endif /* MODULE */


	#define vdma_alloc(foo, bar) ((u32)foo)
	#define vdma_free(baz)
	#define sonic_chiptomem(bat) (bat)
	#define PHYSADDR(quux) (quux)
	#define CPHYSADDR(quux) (quux)

	#define sonic_request_irq request_irq
	#define sonic_free_irq free_irq

	#include "sonic.c"

	/*
	* Local variables:
	* compile-command: "m68k-linux-gcc -D__KERNEL__ -I../../include -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -pipe -fno-strength-reduce -ffixed-a2 -DMODULE -DMODVERSIONS -include ../../include/linux/modversions.h -c -o macsonic.o macsonic.c"
	* version-control: t
	* kept-new-versions: 5
	* c-indent-level: 8
	* tab-width: 8
	* End:
	*
	*/