drivers/net/tulip/media.c - kernel/msm-4.9 - Gitiles

 /*
 	drivers/net/tulip/media.c

 	Maintained by Jeff Garzik <jgarzik@pobox.com>
 	Copyright 2000,2001  The Linux Kernel Team
 	Written/copyright 1994-2001 by Donald Becker.

 	This software may be used and distributed according to the terms
 	of the GNU General Public License, incorporated herein by reference.

 	Please refer to Documentation/DocBook/tulip-user.{pdf,ps,html}
 	for more information on this driver, or visit the project
 	Web page at http://sourceforge.net/projects/tulip/

 */

 #include <linux/kernel.h>
 #include <linux/mii.h>
 #include <linux/init.h>
 #include <linux/delay.h>
 #include <linux/pci.h>
 #include "tulip.h"


 /* The maximum data clock rate is 2.5 Mhz.  The minimum timing is usually
    met by back-to-back PCI I/O cycles, but we insert a delay to avoid
    "overclocking" issues or future 66Mhz PCI. */
 #define mdio_delay() ioread32(mdio_addr)

 /* Read and write the MII registers using software-generated serial
    MDIO protocol.  It is just different enough from the EEPROM protocol
    to not share code.  The maxium data clock rate is 2.5 Mhz. */
 #define MDIO_SHIFT_CLK		0x10000
 #define MDIO_DATA_WRITE0	0x00000
 #define MDIO_DATA_WRITE1	0x20000
 #define MDIO_ENB		0x00000 /* Ignore the 0x02000 databook setting. */
 #define MDIO_ENB_IN		0x40000
 #define MDIO_DATA_READ		0x80000

 static const unsigned char comet_miireg2offset[32] = {
 	0xB4, 0xB8, 0xBC, 0xC0,  0xC4, 0xC8, 0xCC, 0,  0,0,0,0,  0,0,0,0,
 	0,0xD0,0,0,  0,0,0,0,  0,0,0,0, 0, 0xD4, 0xD8, 0xDC, };


 /* MII transceiver control section.
    Read and write the MII registers using software-generated serial
    MDIO protocol.  See the MII specifications or DP83840A data sheet
    for details. */

 int tulip_mdio_read(struct net_device *dev, int phy_id, int location)
 {
 	struct tulip_private *tp = netdev_priv(dev);
 	int i;
 	int read_cmd = (0xf6 << 10) | ((phy_id & 0x1f) << 5) | location;
 	int retval = 0;
 	void __iomem *ioaddr = tp->base_addr;
 	void __iomem *mdio_addr = ioaddr + CSR9;
 	unsigned long flags;

 	if (location & ~0x1f)
 		return 0xffff;

 	if (tp->chip_id == COMET  &&  phy_id == 30) {
 		if (comet_miireg2offset[location])
 			return ioread32(ioaddr + comet_miireg2offset[location]);
 		return 0xffff;
 	}

 	spin_lock_irqsave(&tp->mii_lock, flags);
 	if (tp->chip_id == LC82C168) {
 		int i = 1000;
 		iowrite32(0x60020000 + (phy_id<<23) + (location<<18), ioaddr + 0xA0);
 		ioread32(ioaddr + 0xA0);
 		ioread32(ioaddr + 0xA0);
 		while (--i > 0) {
 			barrier();
 			if ( ! ((retval = ioread32(ioaddr + 0xA0)) & 0x80000000))
 				break;
 		}
 		spin_unlock_irqrestore(&tp->mii_lock, flags);
 		return retval & 0xffff;
 	}

 	/* Establish sync by sending at least 32 logic ones. */
 	for (i = 32; i >= 0; i--) {
 		iowrite32(MDIO_ENB | MDIO_DATA_WRITE1, mdio_addr);
 		mdio_delay();
 		iowrite32(MDIO_ENB | MDIO_DATA_WRITE1 | MDIO_SHIFT_CLK, mdio_addr);
 		mdio_delay();
 	}
 	/* Shift the read command bits out. */
 	for (i = 15; i >= 0; i--) {
 		int dataval = (read_cmd & (1 << i)) ? MDIO_DATA_WRITE1 : 0;

 		iowrite32(MDIO_ENB | dataval, mdio_addr);
 		mdio_delay();
 		iowrite32(MDIO_ENB | dataval | MDIO_SHIFT_CLK, mdio_addr);
 		mdio_delay();
 	}
 	/* Read the two transition, 16 data, and wire-idle bits. */
 	for (i = 19; i > 0; i--) {
 		iowrite32(MDIO_ENB_IN, mdio_addr);
 		mdio_delay();
 		retval = (retval << 1) | ((ioread32(mdio_addr) & MDIO_DATA_READ) ? 1 : 0);
 		iowrite32(MDIO_ENB_IN | MDIO_SHIFT_CLK, mdio_addr);
 		mdio_delay();
 	}

 	spin_unlock_irqrestore(&tp->mii_lock, flags);
 	return (retval>>1) & 0xffff;
 }

 void tulip_mdio_write(struct net_device *dev, int phy_id, int location, int val)
 {
 	struct tulip_private *tp = netdev_priv(dev);
 	int i;
 	int cmd = (0x5002 << 16) | ((phy_id & 0x1f) << 23) | (location<<18) | (val & 0xffff);
 	void __iomem *ioaddr = tp->base_addr;
 	void __iomem *mdio_addr = ioaddr + CSR9;
 	unsigned long flags;

 	if (location & ~0x1f)
 		return;

 	if (tp->chip_id == COMET && phy_id == 30) {
 		if (comet_miireg2offset[location])
 			iowrite32(val, ioaddr + comet_miireg2offset[location]);
 		return;
 	}

 	spin_lock_irqsave(&tp->mii_lock, flags);
 	if (tp->chip_id == LC82C168) {
 		int i = 1000;
 		iowrite32(cmd, ioaddr + 0xA0);
 		do {
 			barrier();
 			if ( ! (ioread32(ioaddr + 0xA0) & 0x80000000))
 				break;
 		} while (--i > 0);
 		spin_unlock_irqrestore(&tp->mii_lock, flags);
 		return;
 	}

 	/* Establish sync by sending 32 logic ones. */
 	for (i = 32; i >= 0; i--) {
 		iowrite32(MDIO_ENB | MDIO_DATA_WRITE1, mdio_addr);
 		mdio_delay();
 		iowrite32(MDIO_ENB | MDIO_DATA_WRITE1 | MDIO_SHIFT_CLK, mdio_addr);
 		mdio_delay();
 	}
 	/* Shift the command bits out. */
 	for (i = 31; i >= 0; i--) {
 		int dataval = (cmd & (1 << i)) ? MDIO_DATA_WRITE1 : 0;
 		iowrite32(MDIO_ENB | dataval, mdio_addr);
 		mdio_delay();
 		iowrite32(MDIO_ENB | dataval | MDIO_SHIFT_CLK, mdio_addr);
 		mdio_delay();
 	}
 	/* Clear out extra bits. */
 	for (i = 2; i > 0; i--) {
 		iowrite32(MDIO_ENB_IN, mdio_addr);
 		mdio_delay();
 		iowrite32(MDIO_ENB_IN | MDIO_SHIFT_CLK, mdio_addr);
 		mdio_delay();
 	}

 	spin_unlock_irqrestore(&tp->mii_lock, flags);
 }


 /* Set up the transceiver control registers for the selected media type. */
 void tulip_select_media(struct net_device *dev, int startup)
 {
 	struct tulip_private *tp = netdev_priv(dev);
 	void __iomem *ioaddr = tp->base_addr;
 	struct mediatable *mtable = tp->mtable;
 	u32 new_csr6;
 	int i;

 	if (mtable) {
 		struct medialeaf *mleaf = &mtable->mleaf[tp->cur_index];
 		unsigned char *p = mleaf->leafdata;
 		switch (mleaf->type) {
 		case 0:					/* 21140 non-MII xcvr. */
 			if (tulip_debug > 1)
 				printk(KERN_DEBUG "%s: Using a 21140 non-MII transceiver"
 					   " with control setting %2.2x.\n",
 					   dev->name, p[1]);
 			dev->if_port = p[0];
 			if (startup)
 				iowrite32(mtable->csr12dir | 0x100, ioaddr + CSR12);
 			iowrite32(p[1], ioaddr + CSR12);
 			new_csr6 = 0x02000000 | ((p[2] & 0x71) << 18);
 			break;
 		case 2: case 4: {
 			u16 setup[5];
 			u32 csr13val, csr14val, csr15dir, csr15val;
 			for (i = 0; i < 5; i++)
 				setup[i] = get_u16(&p[i*2 + 1]);

 			dev->if_port = p[0] & MEDIA_MASK;
 			if (tulip_media_cap[dev->if_port] & MediaAlwaysFD)
 				tp->full_duplex = 1;

 			if (startup && mtable->has_reset) {
 				struct medialeaf *rleaf = &mtable->mleaf[mtable->has_reset];
 				unsigned char *rst = rleaf->leafdata;
 				if (tulip_debug > 1)
 					printk(KERN_DEBUG "%s: Resetting the transceiver.\n",
 						   dev->name);
 				for (i = 0; i < rst[0]; i++)
 					iowrite32(get_u16(rst + 1 + (i<<1)) << 16, ioaddr + CSR15);
 			}
 			if (tulip_debug > 1)
 				printk(KERN_DEBUG "%s: 21143 non-MII %s transceiver control "
 					   "%4.4x/%4.4x.\n",
 					   dev->name, medianame[dev->if_port], setup[0], setup[1]);
 			if (p[0] & 0x40) {	/* SIA (CSR13-15) setup values are provided. */
 				csr13val = setup[0];
 				csr14val = setup[1];
 				csr15dir = (setup[3]<<16) | setup[2];
 				csr15val = (setup[4]<<16) | setup[2];
 				iowrite32(0, ioaddr + CSR13);
 				iowrite32(csr14val, ioaddr + CSR14);
 				iowrite32(csr15dir, ioaddr + CSR15);	/* Direction */
 				iowrite32(csr15val, ioaddr + CSR15);	/* Data */
 				iowrite32(csr13val, ioaddr + CSR13);
 			} else {
 				csr13val = 1;
 				csr14val = 0;
 				csr15dir = (setup[0]<<16) | 0x0008;
 				csr15val = (setup[1]<<16) | 0x0008;
 				if (dev->if_port <= 4)
 					csr14val = t21142_csr14[dev->if_port];
 				if (startup) {
 					iowrite32(0, ioaddr + CSR13);
 					iowrite32(csr14val, ioaddr + CSR14);
 				}
 				iowrite32(csr15dir, ioaddr + CSR15);	/* Direction */
 				iowrite32(csr15val, ioaddr + CSR15);	/* Data */
 				if (startup) iowrite32(csr13val, ioaddr + CSR13);
 			}
 			if (tulip_debug > 1)
 				printk(KERN_DEBUG "%s:  Setting CSR15 to %8.8x/%8.8x.\n",
 					   dev->name, csr15dir, csr15val);
 			if (mleaf->type == 4)
 				new_csr6 = 0x82020000 | ((setup[2] & 0x71) << 18);
 			else
 				new_csr6 = 0x82420000;
 			break;
 		}
 		case 1: case 3: {
 			int phy_num = p[0];
 			int init_length = p[1];
 			u16 *misc_info, tmp_info;

 			dev->if_port = 11;
 			new_csr6 = 0x020E0000;
 			if (mleaf->type == 3) {	/* 21142 */
 				u16 *init_sequence = (u16*)(p+2);
 				u16 *reset_sequence = &((u16*)(p+3))[init_length];
 				int reset_length = p[2 + init_length*2];
 				misc_info = reset_sequence + reset_length;
 				if (startup)
 					for (i = 0; i < reset_length; i++)
 						iowrite32(get_u16(&reset_sequence[i]) << 16, ioaddr + CSR15);
 				for (i = 0; i < init_length; i++)
 					iowrite32(get_u16(&init_sequence[i]) << 16, ioaddr + CSR15);
 			} else {
 				u8 *init_sequence = p + 2;
 				u8 *reset_sequence = p + 3 + init_length;
 				int reset_length = p[2 + init_length];
 				misc_info = (u16*)(reset_sequence + reset_length);
 				if (startup) {
 					iowrite32(mtable->csr12dir | 0x100, ioaddr + CSR12);
 					for (i = 0; i < reset_length; i++)
 						iowrite32(reset_sequence[i], ioaddr + CSR12);
 				}
 				for (i = 0; i < init_length; i++)
 					iowrite32(init_sequence[i], ioaddr + CSR12);
 			}
 			tmp_info = get_u16(&misc_info[1]);
 			if (tmp_info)
 				tp->advertising[phy_num] = tmp_info | 1;
 			if (tmp_info && startup < 2) {
 				if (tp->mii_advertise == 0)
 					tp->mii_advertise = tp->advertising[phy_num];
 				if (tulip_debug > 1)
 					printk(KERN_DEBUG "%s:  Advertising %4.4x on MII %d.\n",
 					       dev->name, tp->mii_advertise, tp->phys[phy_num]);
 				tulip_mdio_write(dev, tp->phys[phy_num], 4, tp->mii_advertise);
 			}
 			break;
 		}
 		case 5: case 6: {
 			u16 setup[5];

 			new_csr6 = 0; /* FIXME */

 			for (i = 0; i < 5; i++)
 				setup[i] = get_u16(&p[i*2 + 1]);

 			if (startup && mtable->has_reset) {
 				struct medialeaf *rleaf = &mtable->mleaf[mtable->has_reset];
 				unsigned char *rst = rleaf->leafdata;
 				if (tulip_debug > 1)
 					printk(KERN_DEBUG "%s: Resetting the transceiver.\n",
 						   dev->name);
 				for (i = 0; i < rst[0]; i++)
 					iowrite32(get_u16(rst + 1 + (i<<1)) << 16, ioaddr + CSR15);
 			}

 			break;
 		}
 		default:
 			printk(KERN_DEBUG "%s:  Invalid media table selection %d.\n",
 					   dev->name, mleaf->type);
 			new_csr6 = 0x020E0000;
 		}
 		if (tulip_debug > 1)
 			printk(KERN_DEBUG "%s: Using media type %s, CSR12 is %2.2x.\n",
 				   dev->name, medianame[dev->if_port],
 				   ioread32(ioaddr + CSR12) & 0xff);
 	} else if (tp->chip_id == LC82C168) {
 		if (startup && ! tp->medialock)
 			dev->if_port = tp->mii_cnt ? 11 : 0;
 		if (tulip_debug > 1)
 			printk(KERN_DEBUG "%s: PNIC PHY status is %3.3x, media %s.\n",
 				   dev->name, ioread32(ioaddr + 0xB8), medianame[dev->if_port]);
 		if (tp->mii_cnt) {
 			new_csr6 = 0x810C0000;
 			iowrite32(0x0001, ioaddr + CSR15);
 			iowrite32(0x0201B07A, ioaddr + 0xB8);
 		} else if (startup) {
 			/* Start with 10mbps to do autonegotiation. */
 			iowrite32(0x32, ioaddr + CSR12);
 			new_csr6 = 0x00420000;
 			iowrite32(0x0001B078, ioaddr + 0xB8);
 			iowrite32(0x0201B078, ioaddr + 0xB8);
 		} else if (dev->if_port == 3  ||  dev->if_port == 5) {
 			iowrite32(0x33, ioaddr + CSR12);
 			new_csr6 = 0x01860000;
 			/* Trigger autonegotiation. */
 			iowrite32(startup ? 0x0201F868 : 0x0001F868, ioaddr + 0xB8);
 		} else {
 			iowrite32(0x32, ioaddr + CSR12);
 			new_csr6 = 0x00420000;
 			iowrite32(0x1F078, ioaddr + 0xB8);
 		}
 	} else {					/* Unknown chip type with no media table. */
 		if (tp->default_port == 0)
 			dev->if_port = tp->mii_cnt ? 11 : 3;
 		if (tulip_media_cap[dev->if_port] & MediaIsMII) {
 			new_csr6 = 0x020E0000;
 		} else if (tulip_media_cap[dev->if_port] & MediaIsFx) {
 			new_csr6 = 0x02860000;
 		} else
 			new_csr6 = 0x03860000;
 		if (tulip_debug > 1)
 			printk(KERN_DEBUG "%s: No media description table, assuming "
 				   "%s transceiver, CSR12 %2.2x.\n",
 				   dev->name, medianame[dev->if_port],
 				   ioread32(ioaddr + CSR12));
 	}

 	tp->csr6 = new_csr6 | (tp->csr6 & 0xfdff) | (tp->full_duplex ? 0x0200 : 0);

 	mdelay(1);

 	return;
 }

 /*
   Check the MII negotiated duplex and change the CSR6 setting if
   required.
   Return 0 if everything is OK.
   Return < 0 if the transceiver is missing or has no link beat.
   */
 int tulip_check_duplex(struct net_device *dev)
 {
 	struct tulip_private *tp = netdev_priv(dev);
 	unsigned int bmsr, lpa, negotiated, new_csr6;

 	bmsr = tulip_mdio_read(dev, tp->phys[0], MII_BMSR);
 	lpa = tulip_mdio_read(dev, tp->phys[0], MII_LPA);
 	if (tulip_debug > 1)
 		printk(KERN_INFO "%s: MII status %4.4x, Link partner report "
 			   "%4.4x.\n", dev->name, bmsr, lpa);
 	if (bmsr == 0xffff)
 		return -2;
 	if ((bmsr & BMSR_LSTATUS) == 0) {
 		int new_bmsr = tulip_mdio_read(dev, tp->phys[0], MII_BMSR);
 		if ((new_bmsr & BMSR_LSTATUS) == 0) {
 			if (tulip_debug  > 1)
 				printk(KERN_INFO "%s: No link beat on the MII interface,"
 					   " status %4.4x.\n", dev->name, new_bmsr);
 			return -1;
 		}
 	}
 	negotiated = lpa & tp->advertising[0];
 	tp->full_duplex = mii_duplex(tp->full_duplex_lock, negotiated);

 	new_csr6 = tp->csr6;

 	if (negotiated & LPA_100) new_csr6 &= ~TxThreshold;
 	else			  new_csr6 |= TxThreshold;
 	if (tp->full_duplex) new_csr6 |= FullDuplex;
 	else		     new_csr6 &= ~FullDuplex;

 	if (new_csr6 != tp->csr6) {
 		tp->csr6 = new_csr6;
 		tulip_restart_rxtx(tp);

 		if (tulip_debug > 0)
 			printk(KERN_INFO "%s: Setting %s-duplex based on MII"
 				   "#%d link partner capability of %4.4x.\n",
 				   dev->name, tp->full_duplex ? "full" : "half",
 				   tp->phys[0], lpa);
 		return 1;
 	}

 	return 0;
 }

 void __devinit tulip_find_mii (struct net_device *dev, int board_idx)
 {
 	struct tulip_private *tp = netdev_priv(dev);
 	int phyn, phy_idx = 0;
 	int mii_reg0;
 	int mii_advert;
 	unsigned int to_advert, new_bmcr, ane_switch;

 	/* Find the connected MII xcvrs.
 	   Doing this in open() would allow detecting external xcvrs later,
 	   but takes much time. */
 	for (phyn = 1; phyn <= 32 && phy_idx < sizeof (tp->phys); phyn++) {
 		int phy = phyn & 0x1f;
 		int mii_status = tulip_mdio_read (dev, phy, MII_BMSR);
 		if ((mii_status & 0x8301) == 0x8001 ||
 		    ((mii_status & BMSR_100BASE4) == 0
 		     && (mii_status & 0x7800) != 0)) {
 			/* preserve Becker logic, gain indentation level */
 		} else {
 			continue;
 		}

 		mii_reg0 = tulip_mdio_read (dev, phy, MII_BMCR);
 		mii_advert = tulip_mdio_read (dev, phy, MII_ADVERTISE);
 		ane_switch = 0;

 		/* if not advertising at all, gen an
 		 * advertising value from the capability
 		 * bits in BMSR
 		 */
 		if ((mii_advert & ADVERTISE_ALL) == 0) {
 			unsigned int tmpadv = tulip_mdio_read (dev, phy, MII_BMSR);
 			mii_advert = ((tmpadv >> 6) & 0x3e0) | 1;
 		}

 		if (tp->mii_advertise) {
 			tp->advertising[phy_idx] =
 			to_advert = tp->mii_advertise;
 		} else if (tp->advertising[phy_idx]) {
 			to_advert = tp->advertising[phy_idx];
 		} else {
 			tp->advertising[phy_idx] =
 			tp->mii_advertise =
 			to_advert = mii_advert;
 		}

 		tp->phys[phy_idx++] = phy;

 		printk (KERN_INFO "tulip%d:  MII transceiver #%d "
 			"config %4.4x status %4.4x advertising %4.4x.\n",
 			board_idx, phy, mii_reg0, mii_status, mii_advert);

 		/* Fixup for DLink with miswired PHY. */
 		if (mii_advert != to_advert) {
 			printk (KERN_DEBUG "tulip%d:  Advertising %4.4x on PHY %d,"
 				" previously advertising %4.4x.\n",
 				board_idx, to_advert, phy, mii_advert);
 			tulip_mdio_write (dev, phy, 4, to_advert);
 		}

 		/* Enable autonegotiation: some boards default to off. */
 		if (tp->default_port == 0) {
 			new_bmcr = mii_reg0 | BMCR_ANENABLE;
 			if (new_bmcr != mii_reg0) {
 				new_bmcr |= BMCR_ANRESTART;
 				ane_switch = 1;
 			}
 		}
 		/* ...or disable nway, if forcing media */
 		else {
 			new_bmcr = mii_reg0 & ~BMCR_ANENABLE;
 			if (new_bmcr != mii_reg0)
 				ane_switch = 1;
 		}

 		/* clear out bits we never want at this point */
 		new_bmcr &= ~(BMCR_CTST | BMCR_FULLDPLX | BMCR_ISOLATE |
 			      BMCR_PDOWN | BMCR_SPEED100 | BMCR_LOOPBACK |
 			      BMCR_RESET);

 		if (tp->full_duplex)
 			new_bmcr |= BMCR_FULLDPLX;
 		if (tulip_media_cap[tp->default_port] & MediaIs100)
 			new_bmcr |= BMCR_SPEED100;

 		if (new_bmcr != mii_reg0) {
 			/* some phys need the ANE switch to
 			 * happen before forced media settings
 			 * will "take."  However, we write the
 			 * same value twice in order not to
 			 * confuse the sane phys.
 			 */
 			if (ane_switch) {
 				tulip_mdio_write (dev, phy, MII_BMCR, new_bmcr);
 				udelay (10);
 			}
 			tulip_mdio_write (dev, phy, MII_BMCR, new_bmcr);
 		}
 	}
 	tp->mii_cnt = phy_idx;
 	if (tp->mtable && tp->mtable->has_mii && phy_idx == 0) {
 		printk (KERN_INFO "tulip%d: ***WARNING***: No MII transceiver found!\n",
 			board_idx);
 		tp->phys[0] = 1;
 	}
 }
	/*
	drivers/net/tulip/media.c

	Maintained by Jeff Garzik <jgarzik@pobox.com>
	Copyright 2000,2001 The Linux Kernel Team
	Written/copyright 1994-2001 by Donald Becker.

	This software may be used and distributed according to the terms
	of the GNU General Public License, incorporated herein by reference.

	Please refer to Documentation/DocBook/tulip-user.{pdf,ps,html}
	for more information on this driver, or visit the project
	Web page at http://sourceforge.net/projects/tulip/

	*/

	#include <linux/kernel.h>
	#include <linux/mii.h>
	#include <linux/init.h>
	#include <linux/delay.h>
	#include <linux/pci.h>
	#include "tulip.h"


	/* The maximum data clock rate is 2.5 Mhz. The minimum timing is usually
	met by back-to-back PCI I/O cycles, but we insert a delay to avoid
	"overclocking" issues or future 66Mhz PCI. */
	#define mdio_delay() ioread32(mdio_addr)

	/* Read and write the MII registers using software-generated serial
	MDIO protocol. It is just different enough from the EEPROM protocol
	to not share code. The maxium data clock rate is 2.5 Mhz. */
	#define MDIO_SHIFT_CLK 0x10000
	#define MDIO_DATA_WRITE0 0x00000
	#define MDIO_DATA_WRITE1 0x20000
	#define MDIO_ENB 0x00000 /* Ignore the 0x02000 databook setting. */
	#define MDIO_ENB_IN 0x40000
	#define MDIO_DATA_READ 0x80000

	static const unsigned char comet_miireg2offset[32] = {
	0xB4, 0xB8, 0xBC, 0xC0, 0xC4, 0xC8, 0xCC, 0, 0,0,0,0, 0,0,0,0,
	0,0xD0,0,0, 0,0,0,0, 0,0,0,0, 0, 0xD4, 0xD8, 0xDC, };


	/* MII transceiver control section.
	Read and write the MII registers using software-generated serial
	MDIO protocol. See the MII specifications or DP83840A data sheet
	for details. */

	int tulip_mdio_read(struct net_device *dev, int phy_id, int location)
	{
	struct tulip_private *tp = netdev_priv(dev);
	int i;
	int read_cmd = (0xf6 << 10) \| ((phy_id & 0x1f) << 5) \| location;
	int retval = 0;
	void __iomem *ioaddr = tp->base_addr;
	void __iomem *mdio_addr = ioaddr + CSR9;
	unsigned long flags;

	if (location & ~0x1f)
	return 0xffff;

	if (tp->chip_id == COMET && phy_id == 30) {
	if (comet_miireg2offset[location])
	return ioread32(ioaddr + comet_miireg2offset[location]);
	return 0xffff;
	}

	spin_lock_irqsave(&tp->mii_lock, flags);
	if (tp->chip_id == LC82C168) {
	int i = 1000;
	iowrite32(0x60020000 + (phy_id<<23) + (location<<18), ioaddr + 0xA0);
	ioread32(ioaddr + 0xA0);
	ioread32(ioaddr + 0xA0);
	while (--i > 0) {
	barrier();
	if ( ! ((retval = ioread32(ioaddr + 0xA0)) & 0x80000000))
	break;
	}
	spin_unlock_irqrestore(&tp->mii_lock, flags);
	return retval & 0xffff;
	}

	/* Establish sync by sending at least 32 logic ones. */
	for (i = 32; i >= 0; i--) {
	iowrite32(MDIO_ENB \| MDIO_DATA_WRITE1, mdio_addr);
	mdio_delay();
	iowrite32(MDIO_ENB \| MDIO_DATA_WRITE1 \| MDIO_SHIFT_CLK, mdio_addr);
	mdio_delay();
	}
	/* Shift the read command bits out. */
	for (i = 15; i >= 0; i--) {
	int dataval = (read_cmd & (1 << i)) ? MDIO_DATA_WRITE1 : 0;

	iowrite32(MDIO_ENB \| dataval, mdio_addr);
	mdio_delay();
	iowrite32(MDIO_ENB \| dataval \| MDIO_SHIFT_CLK, mdio_addr);
	mdio_delay();
	}
	/* Read the two transition, 16 data, and wire-idle bits. */
	for (i = 19; i > 0; i--) {
	iowrite32(MDIO_ENB_IN, mdio_addr);
	mdio_delay();
	retval = (retval << 1) \| ((ioread32(mdio_addr) & MDIO_DATA_READ) ? 1 : 0);
	iowrite32(MDIO_ENB_IN \| MDIO_SHIFT_CLK, mdio_addr);
	mdio_delay();
	}

	spin_unlock_irqrestore(&tp->mii_lock, flags);
	return (retval>>1) & 0xffff;
	}

	void tulip_mdio_write(struct net_device *dev, int phy_id, int location, int val)
	{
	struct tulip_private *tp = netdev_priv(dev);
	int i;
	int cmd = (0x5002 << 16) \| ((phy_id & 0x1f) << 23) \| (location<<18) \| (val & 0xffff);
	void __iomem *ioaddr = tp->base_addr;
	void __iomem *mdio_addr = ioaddr + CSR9;
	unsigned long flags;

	if (location & ~0x1f)
	return;

	if (tp->chip_id == COMET && phy_id == 30) {
	if (comet_miireg2offset[location])
	iowrite32(val, ioaddr + comet_miireg2offset[location]);
	return;
	}

	spin_lock_irqsave(&tp->mii_lock, flags);
	if (tp->chip_id == LC82C168) {
	int i = 1000;
	iowrite32(cmd, ioaddr + 0xA0);
	do {
	barrier();
	if ( ! (ioread32(ioaddr + 0xA0) & 0x80000000))
	break;
	} while (--i > 0);
	spin_unlock_irqrestore(&tp->mii_lock, flags);
	return;
	}

	/* Establish sync by sending 32 logic ones. */
	for (i = 32; i >= 0; i--) {
	iowrite32(MDIO_ENB \| MDIO_DATA_WRITE1, mdio_addr);
	mdio_delay();
	iowrite32(MDIO_ENB \| MDIO_DATA_WRITE1 \| MDIO_SHIFT_CLK, mdio_addr);
	mdio_delay();
	}
	/* Shift the command bits out. */
	for (i = 31; i >= 0; i--) {
	int dataval = (cmd & (1 << i)) ? MDIO_DATA_WRITE1 : 0;
	iowrite32(MDIO_ENB \| dataval, mdio_addr);
	mdio_delay();
	iowrite32(MDIO_ENB \| dataval \| MDIO_SHIFT_CLK, mdio_addr);
	mdio_delay();
	}
	/* Clear out extra bits. */
	for (i = 2; i > 0; i--) {
	iowrite32(MDIO_ENB_IN, mdio_addr);
	mdio_delay();
	iowrite32(MDIO_ENB_IN \| MDIO_SHIFT_CLK, mdio_addr);
	mdio_delay();
	}

	spin_unlock_irqrestore(&tp->mii_lock, flags);
	}


	/* Set up the transceiver control registers for the selected media type. */
	void tulip_select_media(struct net_device *dev, int startup)
	{
	struct tulip_private *tp = netdev_priv(dev);
	void __iomem *ioaddr = tp->base_addr;
	struct mediatable *mtable = tp->mtable;
	u32 new_csr6;
	int i;

	if (mtable) {
	struct medialeaf *mleaf = &mtable->mleaf[tp->cur_index];
	unsigned char *p = mleaf->leafdata;
	switch (mleaf->type) {
	case 0: /* 21140 non-MII xcvr. */
	if (tulip_debug > 1)
	printk(KERN_DEBUG "%s: Using a 21140 non-MII transceiver"
	" with control setting %2.2x.\n",
	dev->name, p[1]);
	dev->if_port = p[0];
	if (startup)
	iowrite32(mtable->csr12dir \| 0x100, ioaddr + CSR12);
	iowrite32(p[1], ioaddr + CSR12);
	new_csr6 = 0x02000000 \| ((p[2] & 0x71) << 18);
	break;
	case 2: case 4: {
	u16 setup[5];
	u32 csr13val, csr14val, csr15dir, csr15val;
	for (i = 0; i < 5; i++)
	setup[i] = get_u16(&p[i*2 + 1]);

	dev->if_port = p[0] & MEDIA_MASK;
	if (tulip_media_cap[dev->if_port] & MediaAlwaysFD)
	tp->full_duplex = 1;

	if (startup && mtable->has_reset) {
	struct medialeaf *rleaf = &mtable->mleaf[mtable->has_reset];
	unsigned char *rst = rleaf->leafdata;
	if (tulip_debug > 1)
	printk(KERN_DEBUG "%s: Resetting the transceiver.\n",
	dev->name);
	for (i = 0; i < rst[0]; i++)
	iowrite32(get_u16(rst + 1 + (i<<1)) << 16, ioaddr + CSR15);
	}
	if (tulip_debug > 1)
	printk(KERN_DEBUG "%s: 21143 non-MII %s transceiver control "
	"%4.4x/%4.4x.\n",
	dev->name, medianame[dev->if_port], setup[0], setup[1]);
	if (p[0] & 0x40) { /* SIA (CSR13-15) setup values are provided. */
	csr13val = setup[0];
	csr14val = setup[1];
	csr15dir = (setup[3]<<16) \| setup[2];
	csr15val = (setup[4]<<16) \| setup[2];
	iowrite32(0, ioaddr + CSR13);
	iowrite32(csr14val, ioaddr + CSR14);
	iowrite32(csr15dir, ioaddr + CSR15); /* Direction */
	iowrite32(csr15val, ioaddr + CSR15); /* Data */
	iowrite32(csr13val, ioaddr + CSR13);
	} else {
	csr13val = 1;
	csr14val = 0;
	csr15dir = (setup[0]<<16) \| 0x0008;
	csr15val = (setup[1]<<16) \| 0x0008;
	if (dev->if_port <= 4)
	csr14val = t21142_csr14[dev->if_port];
	if (startup) {
	iowrite32(0, ioaddr + CSR13);
	iowrite32(csr14val, ioaddr + CSR14);
	}
	iowrite32(csr15dir, ioaddr + CSR15); /* Direction */
	iowrite32(csr15val, ioaddr + CSR15); /* Data */
	if (startup) iowrite32(csr13val, ioaddr + CSR13);
	}
	if (tulip_debug > 1)
	printk(KERN_DEBUG "%s: Setting CSR15 to %8.8x/%8.8x.\n",
	dev->name, csr15dir, csr15val);
	if (mleaf->type == 4)
	new_csr6 = 0x82020000 \| ((setup[2] & 0x71) << 18);
	else
	new_csr6 = 0x82420000;
	break;
	}
	case 1: case 3: {
	int phy_num = p[0];
	int init_length = p[1];
	u16 *misc_info, tmp_info;

	dev->if_port = 11;
	new_csr6 = 0x020E0000;
	if (mleaf->type == 3) { /* 21142 */
	u16 init_sequence = (u16)(p+2);
	u16 reset_sequence = &((u16)(p+3))[init_length];
	int reset_length = p[2 + init_length*2];
	misc_info = reset_sequence + reset_length;
	if (startup)
	for (i = 0; i < reset_length; i++)
	iowrite32(get_u16(&reset_sequence[i]) << 16, ioaddr + CSR15);
	for (i = 0; i < init_length; i++)
	iowrite32(get_u16(&init_sequence[i]) << 16, ioaddr + CSR15);
	} else {
	u8 *init_sequence = p + 2;
	u8 *reset_sequence = p + 3 + init_length;
	int reset_length = p[2 + init_length];
	misc_info = (u16*)(reset_sequence + reset_length);
	if (startup) {
	iowrite32(mtable->csr12dir \| 0x100, ioaddr + CSR12);
	for (i = 0; i < reset_length; i++)
	iowrite32(reset_sequence[i], ioaddr + CSR12);
	}
	for (i = 0; i < init_length; i++)
	iowrite32(init_sequence[i], ioaddr + CSR12);
	}
	tmp_info = get_u16(&misc_info[1]);
	if (tmp_info)
	tp->advertising[phy_num] = tmp_info \| 1;
	if (tmp_info && startup < 2) {
	if (tp->mii_advertise == 0)
	tp->mii_advertise = tp->advertising[phy_num];
	if (tulip_debug > 1)
	printk(KERN_DEBUG "%s: Advertising %4.4x on MII %d.\n",
	dev->name, tp->mii_advertise, tp->phys[phy_num]);
	tulip_mdio_write(dev, tp->phys[phy_num], 4, tp->mii_advertise);
	}
	break;
	}
	case 5: case 6: {
	u16 setup[5];

	new_csr6 = 0; /* FIXME */

	for (i = 0; i < 5; i++)
	setup[i] = get_u16(&p[i*2 + 1]);

	if (startup && mtable->has_reset) {
	struct medialeaf *rleaf = &mtable->mleaf[mtable->has_reset];
	unsigned char *rst = rleaf->leafdata;
	if (tulip_debug > 1)
	printk(KERN_DEBUG "%s: Resetting the transceiver.\n",
	dev->name);
	for (i = 0; i < rst[0]; i++)
	iowrite32(get_u16(rst + 1 + (i<<1)) << 16, ioaddr + CSR15);
	}

	break;
	}
	default:
	printk(KERN_DEBUG "%s: Invalid media table selection %d.\n",
	dev->name, mleaf->type);
	new_csr6 = 0x020E0000;
	}
	if (tulip_debug > 1)
	printk(KERN_DEBUG "%s: Using media type %s, CSR12 is %2.2x.\n",
	dev->name, medianame[dev->if_port],
	ioread32(ioaddr + CSR12) & 0xff);
	} else if (tp->chip_id == LC82C168) {
	if (startup && ! tp->medialock)
	dev->if_port = tp->mii_cnt ? 11 : 0;
	if (tulip_debug > 1)
	printk(KERN_DEBUG "%s: PNIC PHY status is %3.3x, media %s.\n",
	dev->name, ioread32(ioaddr + 0xB8), medianame[dev->if_port]);
	if (tp->mii_cnt) {
	new_csr6 = 0x810C0000;
	iowrite32(0x0001, ioaddr + CSR15);
	iowrite32(0x0201B07A, ioaddr + 0xB8);
	} else if (startup) {
	/* Start with 10mbps to do autonegotiation. */
	iowrite32(0x32, ioaddr + CSR12);
	new_csr6 = 0x00420000;
	iowrite32(0x0001B078, ioaddr + 0xB8);
	iowrite32(0x0201B078, ioaddr + 0xB8);
	} else if (dev->if_port == 3 \|\| dev->if_port == 5) {
	iowrite32(0x33, ioaddr + CSR12);
	new_csr6 = 0x01860000;
	/* Trigger autonegotiation. */
	iowrite32(startup ? 0x0201F868 : 0x0001F868, ioaddr + 0xB8);
	} else {
	iowrite32(0x32, ioaddr + CSR12);
	new_csr6 = 0x00420000;
	iowrite32(0x1F078, ioaddr + 0xB8);
	}
	} else { /* Unknown chip type with no media table. */
	if (tp->default_port == 0)
	dev->if_port = tp->mii_cnt ? 11 : 3;
	if (tulip_media_cap[dev->if_port] & MediaIsMII) {
	new_csr6 = 0x020E0000;
	} else if (tulip_media_cap[dev->if_port] & MediaIsFx) {
	new_csr6 = 0x02860000;
	} else
	new_csr6 = 0x03860000;
	if (tulip_debug > 1)
	printk(KERN_DEBUG "%s: No media description table, assuming "
	"%s transceiver, CSR12 %2.2x.\n",
	dev->name, medianame[dev->if_port],
	ioread32(ioaddr + CSR12));
	}

	tp->csr6 = new_csr6 \| (tp->csr6 & 0xfdff) \| (tp->full_duplex ? 0x0200 : 0);

	mdelay(1);

	return;
	}

	/*
	Check the MII negotiated duplex and change the CSR6 setting if
	required.
	Return 0 if everything is OK.
	Return < 0 if the transceiver is missing or has no link beat.
	*/
	int tulip_check_duplex(struct net_device *dev)
	{
	struct tulip_private *tp = netdev_priv(dev);
	unsigned int bmsr, lpa, negotiated, new_csr6;

	bmsr = tulip_mdio_read(dev, tp->phys[0], MII_BMSR);
	lpa = tulip_mdio_read(dev, tp->phys[0], MII_LPA);
	if (tulip_debug > 1)
	printk(KERN_INFO "%s: MII status %4.4x, Link partner report "
	"%4.4x.\n", dev->name, bmsr, lpa);
	if (bmsr == 0xffff)
	return -2;
	if ((bmsr & BMSR_LSTATUS) == 0) {
	int new_bmsr = tulip_mdio_read(dev, tp->phys[0], MII_BMSR);
	if ((new_bmsr & BMSR_LSTATUS) == 0) {
	if (tulip_debug > 1)
	printk(KERN_INFO "%s: No link beat on the MII interface,"
	" status %4.4x.\n", dev->name, new_bmsr);
	return -1;
	}
	}
	negotiated = lpa & tp->advertising[0];
	tp->full_duplex = mii_duplex(tp->full_duplex_lock, negotiated);

	new_csr6 = tp->csr6;

	if (negotiated & LPA_100) new_csr6 &= ~TxThreshold;
	else new_csr6 \|= TxThreshold;
	if (tp->full_duplex) new_csr6 \|= FullDuplex;
	else new_csr6 &= ~FullDuplex;

	if (new_csr6 != tp->csr6) {
	tp->csr6 = new_csr6;
	tulip_restart_rxtx(tp);

	if (tulip_debug > 0)
	printk(KERN_INFO "%s: Setting %s-duplex based on MII"
	"#%d link partner capability of %4.4x.\n",
	dev->name, tp->full_duplex ? "full" : "half",
	tp->phys[0], lpa);
	return 1;
	}

	return 0;
	}

	void __devinit tulip_find_mii (struct net_device *dev, int board_idx)
	{
	struct tulip_private *tp = netdev_priv(dev);
	int phyn, phy_idx = 0;
	int mii_reg0;
	int mii_advert;
	unsigned int to_advert, new_bmcr, ane_switch;

	/* Find the connected MII xcvrs.
	Doing this in open() would allow detecting external xcvrs later,
	but takes much time. */
	for (phyn = 1; phyn <= 32 && phy_idx < sizeof (tp->phys); phyn++) {
	int phy = phyn & 0x1f;
	int mii_status = tulip_mdio_read (dev, phy, MII_BMSR);
	if ((mii_status & 0x8301) == 0x8001 \|\|
	((mii_status & BMSR_100BASE4) == 0
	&& (mii_status & 0x7800) != 0)) {
	/* preserve Becker logic, gain indentation level */
	} else {
	continue;
	}

	mii_reg0 = tulip_mdio_read (dev, phy, MII_BMCR);
	mii_advert = tulip_mdio_read (dev, phy, MII_ADVERTISE);
	ane_switch = 0;

	/* if not advertising at all, gen an
	* advertising value from the capability
	* bits in BMSR
	*/
	if ((mii_advert & ADVERTISE_ALL) == 0) {
	unsigned int tmpadv = tulip_mdio_read (dev, phy, MII_BMSR);
	mii_advert = ((tmpadv >> 6) & 0x3e0) \| 1;
	}

	if (tp->mii_advertise) {
	tp->advertising[phy_idx] =
	to_advert = tp->mii_advertise;
	} else if (tp->advertising[phy_idx]) {
	to_advert = tp->advertising[phy_idx];
	} else {
	tp->advertising[phy_idx] =
	tp->mii_advertise =
	to_advert = mii_advert;
	}

	tp->phys[phy_idx++] = phy;

	printk (KERN_INFO "tulip%d: MII transceiver #%d "
	"config %4.4x status %4.4x advertising %4.4x.\n",
	board_idx, phy, mii_reg0, mii_status, mii_advert);

	/* Fixup for DLink with miswired PHY. */
	if (mii_advert != to_advert) {
	printk (KERN_DEBUG "tulip%d: Advertising %4.4x on PHY %d,"
	" previously advertising %4.4x.\n",
	board_idx, to_advert, phy, mii_advert);
	tulip_mdio_write (dev, phy, 4, to_advert);
	}

	/* Enable autonegotiation: some boards default to off. */
	if (tp->default_port == 0) {
	new_bmcr = mii_reg0 \| BMCR_ANENABLE;
	if (new_bmcr != mii_reg0) {
	new_bmcr \|= BMCR_ANRESTART;
	ane_switch = 1;
	}
	}
	/* ...or disable nway, if forcing media */
	else {
	new_bmcr = mii_reg0 & ~BMCR_ANENABLE;
	if (new_bmcr != mii_reg0)
	ane_switch = 1;
	}

	/* clear out bits we never want at this point */
	new_bmcr &= ~(BMCR_CTST \| BMCR_FULLDPLX \| BMCR_ISOLATE \|
	BMCR_PDOWN \| BMCR_SPEED100 \| BMCR_LOOPBACK \|
	BMCR_RESET);

	if (tp->full_duplex)
	new_bmcr \|= BMCR_FULLDPLX;
	if (tulip_media_cap[tp->default_port] & MediaIs100)
	new_bmcr \|= BMCR_SPEED100;

	if (new_bmcr != mii_reg0) {
	/* some phys need the ANE switch to
	* happen before forced media settings
	* will "take." However, we write the
	* same value twice in order not to
	* confuse the sane phys.
	*/
	if (ane_switch) {
	tulip_mdio_write (dev, phy, MII_BMCR, new_bmcr);
	udelay (10);
	}
	tulip_mdio_write (dev, phy, MII_BMCR, new_bmcr);
	}
	}
	tp->mii_cnt = phy_idx;
	if (tp->mtable && tp->mtable->has_mii && phy_idx == 0) {
	printk (KERN_INFO "tulip%d: *WARNING*: No MII transceiver found!\n",
	board_idx);
	tp->phys[0] = 1;
	}
	}