media.c
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上传日期:2013-02-24
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- /*
- drivers/net/tulip/media.c
- Maintained by Jeff Garzik <jgarzik@mandrakesoft.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.{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 "tulip.h"
- /* This is a mysterious value that can be written to CSR11 in the 21040 (only)
- to support a pre-NWay full-duplex signaling mechanism using short frames.
- No one knows what it should be, but if left at its default value some
- 10base2(!) packets trigger a full-duplex-request interrupt. */
- #define FULL_DUPLEX_MAGIC 0x6969
- /* 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() inl(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 = (struct tulip_private *)dev->priv;
- int i;
- int read_cmd = (0xf6 << 10) | ((phy_id & 0x1f) << 5) | location;
- int retval = 0;
- long ioaddr = dev->base_addr;
- long 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 inl(ioaddr + comet_miireg2offset[location]);
- return 0xffff;
- }
- spin_lock_irqsave(&tp->mii_lock, flags);
- if (tp->chip_id == LC82C168) {
- int i = 1000;
- outl(0x60020000 + (phy_id<<23) + (location<<18), ioaddr + 0xA0);
- inl(ioaddr + 0xA0);
- inl(ioaddr + 0xA0);
- while (--i > 0) {
- barrier();
- if ( ! ((retval = inl(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--) {
- outl(MDIO_ENB | MDIO_DATA_WRITE1, mdio_addr);
- mdio_delay();
- outl(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;
- outl(MDIO_ENB | dataval, mdio_addr);
- mdio_delay();
- outl(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--) {
- outl(MDIO_ENB_IN, mdio_addr);
- mdio_delay();
- retval = (retval << 1) | ((inl(mdio_addr) & MDIO_DATA_READ) ? 1 : 0);
- outl(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 = (struct tulip_private *)dev->priv;
- int i;
- int cmd = (0x5002 << 16) | ((phy_id & 0x1f) << 23) | (location<<18) | (val & 0xffff);
- long ioaddr = dev->base_addr;
- long mdio_addr = ioaddr + CSR9;
- unsigned long flags;
- if (location & ~0x1f)
- return;
- if (tp->chip_id == COMET && phy_id == 30) {
- if (comet_miireg2offset[location])
- outl(val, ioaddr + comet_miireg2offset[location]);
- return;
- }
- spin_lock_irqsave(&tp->mii_lock, flags);
- if (tp->chip_id == LC82C168) {
- int i = 1000;
- outl(cmd, ioaddr + 0xA0);
- do {
- barrier();
- if ( ! (inl(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--) {
- outl(MDIO_ENB | MDIO_DATA_WRITE1, mdio_addr);
- mdio_delay();
- outl(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;
- outl(MDIO_ENB | dataval, mdio_addr);
- mdio_delay();
- outl(MDIO_ENB | dataval | MDIO_SHIFT_CLK, mdio_addr);
- mdio_delay();
- }
- /* Clear out extra bits. */
- for (i = 2; i > 0; i--) {
- outl(MDIO_ENB_IN, mdio_addr);
- mdio_delay();
- outl(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)
- {
- long ioaddr = dev->base_addr;
- struct tulip_private *tp = (struct tulip_private *)dev->priv;
- 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)
- outl(mtable->csr12dir | 0x100, ioaddr + CSR12);
- outl(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++)
- outl(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];
- outl(0, ioaddr + CSR13);
- outl(csr14val, ioaddr + CSR14);
- outl(csr15dir, ioaddr + CSR15); /* Direction */
- outl(csr15val, ioaddr + CSR15); /* Data */
- outl(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) {
- outl(0, ioaddr + CSR13);
- outl(csr14val, ioaddr + CSR14);
- }
- outl(csr15dir, ioaddr + CSR15); /* Direction */
- outl(csr15val, ioaddr + CSR15); /* Data */
- if (startup) outl(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++)
- outl(get_u16(&reset_sequence[i]) << 16, ioaddr + CSR15);
- for (i = 0; i < init_length; i++)
- outl(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) {
- outl(mtable->csr12dir | 0x100, ioaddr + CSR12);
- for (i = 0; i < reset_length; i++)
- outl(reset_sequence[i], ioaddr + CSR12);
- }
- for (i = 0; i < init_length; i++)
- outl(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++)
- outl(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],
- inl(ioaddr + CSR12) & 0xff);
- } else if (tp->chip_id == DC21041) {
- int port = dev->if_port <= 4 ? dev->if_port : 0;
- if (tulip_debug > 1)
- printk(KERN_DEBUG "%s: 21041 using media %s, CSR12 is %4.4x.n",
- dev->name, medianame[port == 3 ? 12: port],
- inl(ioaddr + CSR12));
- outl(0x00000000, ioaddr + CSR13); /* Reset the serial interface */
- outl(t21041_csr14[port], ioaddr + CSR14);
- outl(t21041_csr15[port], ioaddr + CSR15);
- outl(t21041_csr13[port], ioaddr + CSR13);
- new_csr6 = 0x80020000;
- } 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, inl(ioaddr + 0xB8), medianame[dev->if_port]);
- if (tp->mii_cnt) {
- new_csr6 = 0x810C0000;
- outl(0x0001, ioaddr + CSR15);
- outl(0x0201B07A, ioaddr + 0xB8);
- } else if (startup) {
- /* Start with 10mbps to do autonegotiation. */
- outl(0x32, ioaddr + CSR12);
- new_csr6 = 0x00420000;
- outl(0x0001B078, ioaddr + 0xB8);
- outl(0x0201B078, ioaddr + 0xB8);
- } else if (dev->if_port == 3 || dev->if_port == 5) {
- outl(0x33, ioaddr + CSR12);
- new_csr6 = 0x01860000;
- /* Trigger autonegotiation. */
- outl(startup ? 0x0201F868 : 0x0001F868, ioaddr + 0xB8);
- } else {
- outl(0x32, ioaddr + CSR12);
- new_csr6 = 0x00420000;
- outl(0x1F078, ioaddr + 0xB8);
- }
- } else if (tp->chip_id == DC21040) { /* 21040 */
- /* Turn on the xcvr interface. */
- int csr12 = inl(ioaddr + CSR12);
- if (tulip_debug > 1)
- printk(KERN_DEBUG "%s: 21040 media type is %s, CSR12 is %2.2x.n",
- dev->name, medianame[dev->if_port], csr12);
- if (tulip_media_cap[dev->if_port] & MediaAlwaysFD)
- tp->full_duplex = 1;
- new_csr6 = 0x20000;
- /* Set the full duplux match frame. */
- outl(FULL_DUPLEX_MAGIC, ioaddr + CSR11);
- outl(0x00000000, ioaddr + CSR13); /* Reset the serial interface */
- if (t21040_csr13[dev->if_port] & 8) {
- outl(0x0705, ioaddr + CSR14);
- outl(0x0006, ioaddr + CSR15);
- } else {
- outl(0xffff, ioaddr + CSR14);
- outl(0x0000, ioaddr + CSR15);
- }
- outl(0x8f01 | t21040_csr13[dev->if_port], ioaddr + CSR13);
- } 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 = 0x028600000;
- } else
- new_csr6 = 0x038600000;
- 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],
- inl(ioaddr + CSR12));
- }
- tp->csr6 = new_csr6 | (tp->csr6 & 0xfdff) | (tp->full_duplex ? 0x0200 : 0);
- 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 = dev->priv;
- 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 = dev->priv;
- 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;
- }
- }