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a4b770972b
This patch removes from drivers/net/ all the unnecessary
return; statements that precede the last closing brace of
void functions.
It does not remove the returns that are immediately
preceded by a label as gcc doesn't like that.
It also does not remove null void functions with return.
Done via:
$ grep -rP --include=*.[ch] -l "return;\n}" net/ | \
xargs perl -i -e 'local $/ ; while (<>) { s/\n[ \t\n]+return;\n}/\n}/g; print; }'
with some cleanups by hand.
Compile tested x86 allmodconfig only.
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
558 lines
17 KiB
C
558 lines
17 KiB
C
/*
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drivers/net/tulip/media.c
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Copyright 2000,2001 The Linux Kernel Team
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Written/copyright 1994-2001 by Donald Becker.
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This software may be used and distributed according to the terms
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of the GNU General Public License, incorporated herein by reference.
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Please refer to Documentation/DocBook/tulip-user.{pdf,ps,html}
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for more information on this driver.
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Please submit bugs to http://bugzilla.kernel.org/ .
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*/
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#include <linux/kernel.h>
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#include <linux/mii.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/pci.h>
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#include "tulip.h"
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/* The maximum data clock rate is 2.5 Mhz. The minimum timing is usually
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met by back-to-back PCI I/O cycles, but we insert a delay to avoid
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"overclocking" issues or future 66Mhz PCI. */
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#define mdio_delay() ioread32(mdio_addr)
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/* Read and write the MII registers using software-generated serial
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MDIO protocol. It is just different enough from the EEPROM protocol
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to not share code. The maxium data clock rate is 2.5 Mhz. */
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#define MDIO_SHIFT_CLK 0x10000
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#define MDIO_DATA_WRITE0 0x00000
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#define MDIO_DATA_WRITE1 0x20000
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#define MDIO_ENB 0x00000 /* Ignore the 0x02000 databook setting. */
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#define MDIO_ENB_IN 0x40000
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#define MDIO_DATA_READ 0x80000
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static const unsigned char comet_miireg2offset[32] = {
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0xB4, 0xB8, 0xBC, 0xC0, 0xC4, 0xC8, 0xCC, 0, 0,0,0,0, 0,0,0,0,
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0,0xD0,0,0, 0,0,0,0, 0,0,0,0, 0, 0xD4, 0xD8, 0xDC, };
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/* MII transceiver control section.
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Read and write the MII registers using software-generated serial
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MDIO protocol.
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See IEEE 802.3-2002.pdf (Section 2, Chapter "22.2.4 Management functions")
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or DP83840A data sheet for more details.
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*/
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int tulip_mdio_read(struct net_device *dev, int phy_id, int location)
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{
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struct tulip_private *tp = netdev_priv(dev);
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int i;
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int read_cmd = (0xf6 << 10) | ((phy_id & 0x1f) << 5) | location;
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int retval = 0;
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void __iomem *ioaddr = tp->base_addr;
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void __iomem *mdio_addr = ioaddr + CSR9;
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unsigned long flags;
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if (location & ~0x1f)
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return 0xffff;
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if (tp->chip_id == COMET && phy_id == 30) {
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if (comet_miireg2offset[location])
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return ioread32(ioaddr + comet_miireg2offset[location]);
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return 0xffff;
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}
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spin_lock_irqsave(&tp->mii_lock, flags);
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if (tp->chip_id == LC82C168) {
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iowrite32(0x60020000 + (phy_id<<23) + (location<<18), ioaddr + 0xA0);
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ioread32(ioaddr + 0xA0);
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ioread32(ioaddr + 0xA0);
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for (i = 1000; i >= 0; --i) {
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barrier();
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if ( ! ((retval = ioread32(ioaddr + 0xA0)) & 0x80000000))
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break;
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}
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spin_unlock_irqrestore(&tp->mii_lock, flags);
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return retval & 0xffff;
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}
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/* Establish sync by sending at least 32 logic ones. */
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for (i = 32; i >= 0; i--) {
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iowrite32(MDIO_ENB | MDIO_DATA_WRITE1, mdio_addr);
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mdio_delay();
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iowrite32(MDIO_ENB | MDIO_DATA_WRITE1 | MDIO_SHIFT_CLK, mdio_addr);
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mdio_delay();
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}
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/* Shift the read command bits out. */
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for (i = 15; i >= 0; i--) {
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int dataval = (read_cmd & (1 << i)) ? MDIO_DATA_WRITE1 : 0;
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iowrite32(MDIO_ENB | dataval, mdio_addr);
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mdio_delay();
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iowrite32(MDIO_ENB | dataval | MDIO_SHIFT_CLK, mdio_addr);
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mdio_delay();
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}
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/* Read the two transition, 16 data, and wire-idle bits. */
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for (i = 19; i > 0; i--) {
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iowrite32(MDIO_ENB_IN, mdio_addr);
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mdio_delay();
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retval = (retval << 1) | ((ioread32(mdio_addr) & MDIO_DATA_READ) ? 1 : 0);
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iowrite32(MDIO_ENB_IN | MDIO_SHIFT_CLK, mdio_addr);
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mdio_delay();
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}
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spin_unlock_irqrestore(&tp->mii_lock, flags);
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return (retval>>1) & 0xffff;
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}
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void tulip_mdio_write(struct net_device *dev, int phy_id, int location, int val)
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{
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struct tulip_private *tp = netdev_priv(dev);
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int i;
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int cmd = (0x5002 << 16) | ((phy_id & 0x1f) << 23) | (location<<18) | (val & 0xffff);
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void __iomem *ioaddr = tp->base_addr;
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void __iomem *mdio_addr = ioaddr + CSR9;
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unsigned long flags;
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if (location & ~0x1f)
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return;
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if (tp->chip_id == COMET && phy_id == 30) {
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if (comet_miireg2offset[location])
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iowrite32(val, ioaddr + comet_miireg2offset[location]);
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return;
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}
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spin_lock_irqsave(&tp->mii_lock, flags);
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if (tp->chip_id == LC82C168) {
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iowrite32(cmd, ioaddr + 0xA0);
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for (i = 1000; i >= 0; --i) {
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barrier();
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if ( ! (ioread32(ioaddr + 0xA0) & 0x80000000))
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break;
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}
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spin_unlock_irqrestore(&tp->mii_lock, flags);
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return;
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}
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/* Establish sync by sending 32 logic ones. */
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for (i = 32; i >= 0; i--) {
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iowrite32(MDIO_ENB | MDIO_DATA_WRITE1, mdio_addr);
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mdio_delay();
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iowrite32(MDIO_ENB | MDIO_DATA_WRITE1 | MDIO_SHIFT_CLK, mdio_addr);
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mdio_delay();
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}
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/* Shift the command bits out. */
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for (i = 31; i >= 0; i--) {
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int dataval = (cmd & (1 << i)) ? MDIO_DATA_WRITE1 : 0;
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iowrite32(MDIO_ENB | dataval, mdio_addr);
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mdio_delay();
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iowrite32(MDIO_ENB | dataval | MDIO_SHIFT_CLK, mdio_addr);
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mdio_delay();
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}
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/* Clear out extra bits. */
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for (i = 2; i > 0; i--) {
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iowrite32(MDIO_ENB_IN, mdio_addr);
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mdio_delay();
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iowrite32(MDIO_ENB_IN | MDIO_SHIFT_CLK, mdio_addr);
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mdio_delay();
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}
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spin_unlock_irqrestore(&tp->mii_lock, flags);
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}
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/* Set up the transceiver control registers for the selected media type. */
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void tulip_select_media(struct net_device *dev, int startup)
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{
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struct tulip_private *tp = netdev_priv(dev);
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void __iomem *ioaddr = tp->base_addr;
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struct mediatable *mtable = tp->mtable;
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u32 new_csr6;
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int i;
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if (mtable) {
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struct medialeaf *mleaf = &mtable->mleaf[tp->cur_index];
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unsigned char *p = mleaf->leafdata;
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switch (mleaf->type) {
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case 0: /* 21140 non-MII xcvr. */
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if (tulip_debug > 1)
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printk(KERN_DEBUG "%s: Using a 21140 non-MII transceiver with control setting %02x\n",
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dev->name, p[1]);
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dev->if_port = p[0];
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if (startup)
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iowrite32(mtable->csr12dir | 0x100, ioaddr + CSR12);
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iowrite32(p[1], ioaddr + CSR12);
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new_csr6 = 0x02000000 | ((p[2] & 0x71) << 18);
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break;
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case 2: case 4: {
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u16 setup[5];
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u32 csr13val, csr14val, csr15dir, csr15val;
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for (i = 0; i < 5; i++)
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setup[i] = get_u16(&p[i*2 + 1]);
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dev->if_port = p[0] & MEDIA_MASK;
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if (tulip_media_cap[dev->if_port] & MediaAlwaysFD)
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tp->full_duplex = 1;
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if (startup && mtable->has_reset) {
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struct medialeaf *rleaf = &mtable->mleaf[mtable->has_reset];
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unsigned char *rst = rleaf->leafdata;
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if (tulip_debug > 1)
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printk(KERN_DEBUG "%s: Resetting the transceiver\n",
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dev->name);
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for (i = 0; i < rst[0]; i++)
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iowrite32(get_u16(rst + 1 + (i<<1)) << 16, ioaddr + CSR15);
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}
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if (tulip_debug > 1)
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printk(KERN_DEBUG "%s: 21143 non-MII %s transceiver control %04x/%04x\n",
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dev->name, medianame[dev->if_port],
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setup[0], setup[1]);
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if (p[0] & 0x40) { /* SIA (CSR13-15) setup values are provided. */
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csr13val = setup[0];
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csr14val = setup[1];
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csr15dir = (setup[3]<<16) | setup[2];
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csr15val = (setup[4]<<16) | setup[2];
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iowrite32(0, ioaddr + CSR13);
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iowrite32(csr14val, ioaddr + CSR14);
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iowrite32(csr15dir, ioaddr + CSR15); /* Direction */
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iowrite32(csr15val, ioaddr + CSR15); /* Data */
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iowrite32(csr13val, ioaddr + CSR13);
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} else {
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csr13val = 1;
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csr14val = 0;
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csr15dir = (setup[0]<<16) | 0x0008;
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csr15val = (setup[1]<<16) | 0x0008;
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if (dev->if_port <= 4)
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csr14val = t21142_csr14[dev->if_port];
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if (startup) {
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iowrite32(0, ioaddr + CSR13);
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iowrite32(csr14val, ioaddr + CSR14);
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}
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iowrite32(csr15dir, ioaddr + CSR15); /* Direction */
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iowrite32(csr15val, ioaddr + CSR15); /* Data */
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if (startup) iowrite32(csr13val, ioaddr + CSR13);
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}
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if (tulip_debug > 1)
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printk(KERN_DEBUG "%s: Setting CSR15 to %08x/%08x\n",
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dev->name, csr15dir, csr15val);
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if (mleaf->type == 4)
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new_csr6 = 0x82020000 | ((setup[2] & 0x71) << 18);
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else
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new_csr6 = 0x82420000;
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break;
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}
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case 1: case 3: {
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int phy_num = p[0];
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int init_length = p[1];
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u16 *misc_info, tmp_info;
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dev->if_port = 11;
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new_csr6 = 0x020E0000;
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if (mleaf->type == 3) { /* 21142 */
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u16 *init_sequence = (u16*)(p+2);
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u16 *reset_sequence = &((u16*)(p+3))[init_length];
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int reset_length = p[2 + init_length*2];
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misc_info = reset_sequence + reset_length;
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if (startup) {
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int timeout = 10; /* max 1 ms */
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for (i = 0; i < reset_length; i++)
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iowrite32(get_u16(&reset_sequence[i]) << 16, ioaddr + CSR15);
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/* flush posted writes */
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ioread32(ioaddr + CSR15);
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/* Sect 3.10.3 in DP83840A.pdf (p39) */
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udelay(500);
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/* Section 4.2 in DP83840A.pdf (p43) */
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/* and IEEE 802.3 "22.2.4.1.1 Reset" */
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while (timeout-- &&
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(tulip_mdio_read (dev, phy_num, MII_BMCR) & BMCR_RESET))
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udelay(100);
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}
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for (i = 0; i < init_length; i++)
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iowrite32(get_u16(&init_sequence[i]) << 16, ioaddr + CSR15);
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ioread32(ioaddr + CSR15); /* flush posted writes */
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} else {
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u8 *init_sequence = p + 2;
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u8 *reset_sequence = p + 3 + init_length;
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int reset_length = p[2 + init_length];
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misc_info = (u16*)(reset_sequence + reset_length);
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if (startup) {
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int timeout = 10; /* max 1 ms */
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iowrite32(mtable->csr12dir | 0x100, ioaddr + CSR12);
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for (i = 0; i < reset_length; i++)
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iowrite32(reset_sequence[i], ioaddr + CSR12);
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/* flush posted writes */
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ioread32(ioaddr + CSR12);
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/* Sect 3.10.3 in DP83840A.pdf (p39) */
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udelay(500);
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/* Section 4.2 in DP83840A.pdf (p43) */
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/* and IEEE 802.3 "22.2.4.1.1 Reset" */
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while (timeout-- &&
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(tulip_mdio_read (dev, phy_num, MII_BMCR) & BMCR_RESET))
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udelay(100);
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}
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for (i = 0; i < init_length; i++)
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iowrite32(init_sequence[i], ioaddr + CSR12);
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ioread32(ioaddr + CSR12); /* flush posted writes */
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}
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tmp_info = get_u16(&misc_info[1]);
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if (tmp_info)
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tp->advertising[phy_num] = tmp_info | 1;
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if (tmp_info && startup < 2) {
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if (tp->mii_advertise == 0)
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tp->mii_advertise = tp->advertising[phy_num];
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if (tulip_debug > 1)
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printk(KERN_DEBUG "%s: Advertising %04x on MII %d\n",
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dev->name, tp->mii_advertise,
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tp->phys[phy_num]);
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tulip_mdio_write(dev, tp->phys[phy_num], 4, tp->mii_advertise);
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}
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break;
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}
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case 5: case 6: {
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u16 setup[5];
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new_csr6 = 0; /* FIXME */
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for (i = 0; i < 5; i++)
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setup[i] = get_u16(&p[i*2 + 1]);
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if (startup && mtable->has_reset) {
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struct medialeaf *rleaf = &mtable->mleaf[mtable->has_reset];
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unsigned char *rst = rleaf->leafdata;
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if (tulip_debug > 1)
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printk(KERN_DEBUG "%s: Resetting the transceiver\n",
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dev->name);
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for (i = 0; i < rst[0]; i++)
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iowrite32(get_u16(rst + 1 + (i<<1)) << 16, ioaddr + CSR15);
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}
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break;
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}
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default:
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printk(KERN_DEBUG "%s: Invalid media table selection %d\n",
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dev->name, mleaf->type);
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new_csr6 = 0x020E0000;
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}
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if (tulip_debug > 1)
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printk(KERN_DEBUG "%s: Using media type %s, CSR12 is %02x\n",
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dev->name, medianame[dev->if_port],
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ioread32(ioaddr + CSR12) & 0xff);
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} else if (tp->chip_id == LC82C168) {
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if (startup && ! tp->medialock)
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dev->if_port = tp->mii_cnt ? 11 : 0;
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if (tulip_debug > 1)
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printk(KERN_DEBUG "%s: PNIC PHY status is %3.3x, media %s\n",
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dev->name, ioread32(ioaddr + 0xB8), medianame[dev->if_port]);
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if (tp->mii_cnt) {
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new_csr6 = 0x810C0000;
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iowrite32(0x0001, ioaddr + CSR15);
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iowrite32(0x0201B07A, ioaddr + 0xB8);
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} else if (startup) {
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/* Start with 10mbps to do autonegotiation. */
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iowrite32(0x32, ioaddr + CSR12);
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new_csr6 = 0x00420000;
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iowrite32(0x0001B078, ioaddr + 0xB8);
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iowrite32(0x0201B078, ioaddr + 0xB8);
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} else if (dev->if_port == 3 || dev->if_port == 5) {
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iowrite32(0x33, ioaddr + CSR12);
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new_csr6 = 0x01860000;
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/* Trigger autonegotiation. */
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iowrite32(startup ? 0x0201F868 : 0x0001F868, ioaddr + 0xB8);
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} else {
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iowrite32(0x32, ioaddr + CSR12);
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new_csr6 = 0x00420000;
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iowrite32(0x1F078, ioaddr + 0xB8);
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}
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} else { /* Unknown chip type with no media table. */
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if (tp->default_port == 0)
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dev->if_port = tp->mii_cnt ? 11 : 3;
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if (tulip_media_cap[dev->if_port] & MediaIsMII) {
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new_csr6 = 0x020E0000;
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} else if (tulip_media_cap[dev->if_port] & MediaIsFx) {
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new_csr6 = 0x02860000;
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} else
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new_csr6 = 0x03860000;
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if (tulip_debug > 1)
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printk(KERN_DEBUG "%s: No media description table, assuming %s transceiver, CSR12 %02x\n",
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dev->name, medianame[dev->if_port],
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ioread32(ioaddr + CSR12));
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}
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tp->csr6 = new_csr6 | (tp->csr6 & 0xfdff) | (tp->full_duplex ? 0x0200 : 0);
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mdelay(1);
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}
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/*
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Check the MII negotiated duplex and change the CSR6 setting if
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required.
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Return 0 if everything is OK.
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Return < 0 if the transceiver is missing or has no link beat.
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*/
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int tulip_check_duplex(struct net_device *dev)
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{
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struct tulip_private *tp = netdev_priv(dev);
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unsigned int bmsr, lpa, negotiated, new_csr6;
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bmsr = tulip_mdio_read(dev, tp->phys[0], MII_BMSR);
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lpa = tulip_mdio_read(dev, tp->phys[0], MII_LPA);
|
|
if (tulip_debug > 1)
|
|
dev_info(&dev->dev, "MII status %04x, Link partner report %04x\n",
|
|
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)
|
|
dev_info(&dev->dev,
|
|
"No link beat on the MII interface, status %04x\n",
|
|
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)
|
|
dev_info(&dev->dev,
|
|
"Setting %s-duplex based on MII#%d link partner capability of %04x\n",
|
|
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;
|
|
|
|
pr_info("tulip%d: MII transceiver #%d config %04x status %04x advertising %04x\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 %04x on PHY %d, previously advertising %04x\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) {
|
|
pr_info("tulip%d: ***WARNING***: No MII transceiver found!\n",
|
|
board_idx);
|
|
tp->phys[0] = 1;
|
|
}
|
|
}
|