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u-boot/drivers/net/lpc32xx_eth.c
Vladimir Oltean 6b96ca6c00 net: lpc32xx: ensure mdiodev->name is NULL terminated after MDIO_NAME_LEN truncation 
strncpy() simply bails out when copying a source string whose size
exceeds the destination string size, potentially leaving the destination
string unterminated.

One possible way to address is to pass MDIO_NAME_LEN - 1 and a
previously zero-initialized destination string, but this is more
difficult to maintain.

The chosen alternative is to use strlcpy(), which properly limits the
copy len in the (srclen >= size) case to "size - 1", and which is also
more efficient than the strncpy() byte-by-byte implementation by using
memcpy. The destination string returned by strlcpy() is always NULL
terminated.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
2021-09-28 18:50:56 +03:00

651 lines
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// SPDX-License-Identifier: GPL-2.0+
/*
* LPC32xx Ethernet MAC interface driver
*
* (C) Copyright 2014 DENX Software Engineering GmbH
* Written-by: Albert ARIBAUD - 3ADEV <albert.aribaud@3adev.fr>
*/
#include <common.h>
#include <log.h>
#include <net.h>
#include <malloc.h>
#include <miiphy.h>
#include <asm/io.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <asm/types.h>
#include <asm/system.h>
#include <asm/byteorder.h>
#include <asm/arch/cpu.h>
#include <asm/arch/config.h>
/*
* Notes:
*
* 1. Unless specified otherwise, all references to tables or paragraphs
* are to UM10326, "LPC32x0 and LPC32x0/01 User manual".
*
* 2. Only bitfield masks/values which are actually used by the driver
* are defined.
*/
/* a single RX descriptor. The controller has an array of these */
struct lpc32xx_eth_rxdesc {
u32 packet; /* Receive packet pointer */
u32 control; /* Descriptor command status */
};
#define LPC32XX_ETH_RX_DESC_SIZE (sizeof(struct lpc32xx_eth_rxdesc))
/* RX control bitfields/masks (see Table 330) */
#define LPC32XX_ETH_RX_CTRL_SIZE_MASK 0x000007FF
#define LPC32XX_ETH_RX_CTRL_UNUSED 0x7FFFF800
#define LPC32XX_ETH_RX_CTRL_INTERRUPT 0x80000000
/* a single RX status. The controller has an array of these */
struct lpc32xx_eth_rxstat {
u32 statusinfo; /* Transmit Descriptor status */
u32 statushashcrc; /* Transmit Descriptor CRCs */
};
#define LPC32XX_ETH_RX_STAT_SIZE (sizeof(struct lpc32xx_eth_rxstat))
/* RX statusinfo bitfields/masks (see Table 333) */
#define RX_STAT_RXSIZE 0x000007FF
/* Helper: OR of all errors except RANGE */
#define RX_STAT_ERRORS 0x1B800000
/* a single TX descriptor. The controller has an array of these */
struct lpc32xx_eth_txdesc {
u32 packet; /* Transmit packet pointer */
u32 control; /* Descriptor control */
};
#define LPC32XX_ETH_TX_DESC_SIZE (sizeof(struct lpc32xx_eth_txdesc))
/* TX control bitfields/masks (see Table 335) */
#define TX_CTRL_TXSIZE 0x000007FF
#define TX_CTRL_LAST 0x40000000
/* a single TX status. The controller has an array of these */
struct lpc32xx_eth_txstat {
u32 statusinfo; /* Transmit Descriptor status */
};
#define LPC32XX_ETH_TX_STAT_SIZE (sizeof(struct lpc32xx_eth_txstat))
/* Ethernet MAC interface registers (see Table 283) */
struct lpc32xx_eth_registers {
/* MAC registers - 0x3106_0000 to 0x3106_01FC */
u32 mac1; /* MAC configuration register 1 */
u32 mac2; /* MAC configuration register 2 */
u32 ipgt; /* Back-to-back Inter-Packet Gap reg. */
u32 ipgr; /* Non-back-to-back IPG register */
u32 clrt; /* Collision Window / Retry register */
u32 maxf; /* Maximum Frame register */
u32 supp; /* Phy Support register */
u32 test;
u32 mcfg; /* MII management configuration reg. */
u32 mcmd; /* MII management command register */
u32 madr; /* MII management address register */
u32 mwtd; /* MII management wite data register */
u32 mrdd; /* MII management read data register */
u32 mind; /* MII management indicators register */
u32 reserved1[2];
u32 sa0; /* Station address register 0 */
u32 sa1; /* Station address register 1 */
u32 sa2; /* Station address register 2 */
u32 reserved2[45];
/* Control registers */
u32 command;
u32 status;
u32 rxdescriptor;
u32 rxstatus;
u32 rxdescriptornumber; /* actually, number MINUS ONE */
u32 rxproduceindex; /* head of rx desc fifo */
u32 rxconsumeindex; /* tail of rx desc fifo */
u32 txdescriptor;
u32 txstatus;
u32 txdescriptornumber; /* actually, number MINUS ONE */
u32 txproduceindex; /* head of rx desc fifo */
u32 txconsumeindex; /* tail of rx desc fifo */
u32 reserved3[10];
u32 tsv0; /* Transmit status vector register 0 */
u32 tsv1; /* Transmit status vector register 1 */
u32 rsv; /* Receive status vector register */
u32 reserved4[3];
u32 flowcontrolcounter;
u32 flowcontrolstatus;
u32 reserved5[34];
/* RX filter registers - 0x3106_0200 to 0x3106_0FDC */
u32 rxfilterctrl;
u32 rxfilterwolstatus;
u32 rxfilterwolclear;
u32 reserved6;
u32 hashfilterl;
u32 hashfilterh;
u32 reserved7[882];
/* Module control registers - 0x3106_0FE0 to 0x3106_0FF8 */
u32 intstatus; /* Interrupt status register */
u32 intenable;
u32 intclear;
u32 intset;
u32 reserved8;
u32 powerdown;
u32 reserved9;
};
/* MAC1 register bitfields/masks and offsets (see Table 283) */
#define MAC1_RECV_ENABLE 0x00000001
#define MAC1_PASS_ALL_RX_FRAMES 0x00000002
#define MAC1_SOFT_RESET 0x00008000
/* Helper: general reset */
#define MAC1_RESETS 0x0000CF00
/* MAC2 register bitfields/masks and offsets (see Table 284) */
#define MAC2_FULL_DUPLEX 0x00000001
#define MAC2_CRC_ENABLE 0x00000010
#define MAC2_PAD_CRC_ENABLE 0x00000020
/* SUPP register bitfields/masks and offsets (see Table 290) */
#define SUPP_SPEED 0x00000100
/* MCFG register bitfields/masks and offsets (see Table 292) */
#define MCFG_RESET_MII_MGMT 0x00008000
/* divide clock by 28 (see Table 293) */
#define MCFG_CLOCK_SELECT_DIV28 0x0000001C
/* MADR register bitfields/masks and offsets (see Table 295) */
#define MADR_REG_MASK 0x0000001F
#define MADR_PHY_MASK 0x00001F00
#define MADR_REG_OFFSET 0
#define MADR_PHY_OFFSET 8
/* MIND register bitfields/masks (see Table 298) */
#define MIND_BUSY 0x00000001
/* COMMAND register bitfields/masks and offsets (see Table 283) */
#define COMMAND_RXENABLE 0x00000001
#define COMMAND_TXENABLE 0x00000002
#define COMMAND_PASSRUNTFRAME 0x00000040
#define COMMAND_RMII 0x00000200
#define COMMAND_FULL_DUPLEX 0x00000400
/* Helper: general reset */
#define COMMAND_RESETS 0x00000038
/* STATUS register bitfields/masks and offsets (see Table 283) */
#define STATUS_RXSTATUS 0x00000001
#define STATUS_TXSTATUS 0x00000002
/* RXFILTERCTRL register bitfields/masks (see Table 319) */
#define RXFILTERCTRL_ACCEPTBROADCAST 0x00000002
#define RXFILTERCTRL_ACCEPTPERFECT 0x00000020
/* Buffers and descriptors */
#define ATTRS(n) __aligned(n)
#define TX_BUF_COUNT 4
#define RX_BUF_COUNT 4
struct lpc32xx_eth_buffers {
ATTRS(4) struct lpc32xx_eth_txdesc tx_desc[TX_BUF_COUNT];
ATTRS(4) struct lpc32xx_eth_txstat tx_stat[TX_BUF_COUNT];
ATTRS(PKTALIGN) u8 tx_buf[TX_BUF_COUNT*PKTSIZE_ALIGN];
ATTRS(4) struct lpc32xx_eth_rxdesc rx_desc[RX_BUF_COUNT];
ATTRS(8) struct lpc32xx_eth_rxstat rx_stat[RX_BUF_COUNT];
ATTRS(PKTALIGN) u8 rx_buf[RX_BUF_COUNT*PKTSIZE_ALIGN];
};
/* port device data struct */
struct lpc32xx_eth_device {
struct eth_device dev;
struct lpc32xx_eth_registers *regs;
struct lpc32xx_eth_buffers *bufs;
bool phy_rmii;
};
#define LPC32XX_ETH_DEVICE_SIZE (sizeof(struct lpc32xx_eth_device))
/* generic macros */
#define to_lpc32xx_eth(_d) container_of(_d, struct lpc32xx_eth_device, dev)
/* timeout for MII polling */
#define MII_TIMEOUT 10000000
/* limits for PHY and register addresses */
#define MII_MAX_REG (MADR_REG_MASK >> MADR_REG_OFFSET)
#define MII_MAX_PHY (MADR_PHY_MASK >> MADR_PHY_OFFSET)
#if defined(CONFIG_PHYLIB) || defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
/*
* mii_reg_read - miiphy_read callback function.
*
* Returns 16bit phy register value, or 0xffff on error
*/
static int mii_reg_read(struct mii_dev *bus, int phy_adr, int devad,
int reg_ofs)
{
u16 data = 0;
struct eth_device *dev = eth_get_dev_by_name(bus->name);
struct lpc32xx_eth_device *dlpc32xx_eth = to_lpc32xx_eth(dev);
struct lpc32xx_eth_registers *regs = dlpc32xx_eth->regs;
u32 mind_reg;
u32 timeout;
/* check parameters */
if (phy_adr > MII_MAX_PHY) {
printf("%s:%u: Invalid PHY address %d\n",
__func__, __LINE__, phy_adr);
return -EFAULT;
}
if (reg_ofs > MII_MAX_REG) {
printf("%s:%u: Invalid register offset %d\n",
__func__, __LINE__, reg_ofs);
return -EFAULT;
}
/* write the phy and reg addressse into the MII address reg */
writel((phy_adr << MADR_PHY_OFFSET) | (reg_ofs << MADR_REG_OFFSET),
&regs->madr);
/* write 1 to the MII command register to cause a read */
writel(1, &regs->mcmd);
/* wait till the MII is not busy */
timeout = MII_TIMEOUT;
do {
/* read MII indicators register */
mind_reg = readl(&regs->mind);
if (--timeout == 0)
break;
} while (mind_reg & MIND_BUSY);
/* write 0 to the MII command register to finish the read */
writel(0, &regs->mcmd);
if (timeout == 0) {
printf("%s:%u: MII busy timeout\n", __func__, __LINE__);
return -EFAULT;
}
data = (u16) readl(&regs->mrdd);
debug("%s:(adr %d, off %d) => %04x\n", __func__, phy_adr,
reg_ofs, data);
return data;
}
/*
* mii_reg_write - imiiphy_write callback function.
*
* Returns 0 if write succeed, -EINVAL on bad parameters
* -ETIME on timeout
*/
static int mii_reg_write(struct mii_dev *bus, int phy_adr, int devad,
int reg_ofs, u16 data)
{
struct eth_device *dev = eth_get_dev_by_name(bus->name);
struct lpc32xx_eth_device *dlpc32xx_eth = to_lpc32xx_eth(dev);
struct lpc32xx_eth_registers *regs = dlpc32xx_eth->regs;
u32 mind_reg;
u32 timeout;
/* check parameters */
if (phy_adr > MII_MAX_PHY) {
printf("%s:%u: Invalid PHY address %d\n",
__func__, __LINE__, phy_adr);
return -EFAULT;
}
if (reg_ofs > MII_MAX_REG) {
printf("%s:%u: Invalid register offset %d\n",
__func__, __LINE__, reg_ofs);
return -EFAULT;
}
/* write the phy and reg addressse into the MII address reg */
writel((phy_adr << MADR_PHY_OFFSET) | (reg_ofs << MADR_REG_OFFSET),
&regs->madr);
/* write data to the MII write register */
writel(data, &regs->mwtd);
/* wait till the MII is not busy */
timeout = MII_TIMEOUT;
do {
/* read MII indicators register */
mind_reg = readl(&regs->mind);
if (--timeout == 0)
break;
} while (mind_reg & MIND_BUSY);
if (timeout == 0) {
printf("%s:%u: MII busy timeout\n", __func__,
__LINE__);
return -EFAULT;
}
/*debug("%s:(adr %d, off %d) <= %04x\n", __func__, phy_adr,
reg_ofs, data);*/
return 0;
}
#endif
/*
* Provide default Ethernet buffers base address if target did not.
* Locate buffers in SRAM at 0x00001000 to avoid cache issues and
* maximize throughput.
*/
#if !defined(CONFIG_LPC32XX_ETH_BUFS_BASE)
#define CONFIG_LPC32XX_ETH_BUFS_BASE 0x00001000
#endif
static struct lpc32xx_eth_device lpc32xx_eth = {
.regs = (struct lpc32xx_eth_registers *)LPC32XX_ETH_BASE,
.bufs = (struct lpc32xx_eth_buffers *)CONFIG_LPC32XX_ETH_BUFS_BASE,
#if defined(CONFIG_RMII)
.phy_rmii = true,
#endif
};
#define TX_TIMEOUT 10000
static int lpc32xx_eth_send(struct eth_device *dev, void *dataptr, int datasize)
{
struct lpc32xx_eth_device *lpc32xx_eth_device =
container_of(dev, struct lpc32xx_eth_device, dev);
struct lpc32xx_eth_registers *regs = lpc32xx_eth_device->regs;
struct lpc32xx_eth_buffers *bufs = lpc32xx_eth_device->bufs;
int timeout, tx_index;
/* time out if transmit descriptor array remains full too long */
timeout = TX_TIMEOUT;
while ((readl(&regs->status) & STATUS_TXSTATUS) &&
(readl(&regs->txconsumeindex)
== readl(&regs->txproduceindex))) {
if (timeout-- == 0)
return -1;
}
/* determine next transmit packet index to use */
tx_index = readl(&regs->txproduceindex);
/* set up transmit packet */
memcpy((void *)&bufs->tx_buf[tx_index * PKTSIZE_ALIGN],
(void *)dataptr, datasize);
writel(TX_CTRL_LAST | ((datasize - 1) & TX_CTRL_TXSIZE),
&bufs->tx_desc[tx_index].control);
writel(0, &bufs->tx_stat[tx_index].statusinfo);
/* pass transmit packet to DMA engine */
tx_index = (tx_index + 1) % TX_BUF_COUNT;
writel(tx_index, &regs->txproduceindex);
/* transmission succeeded */
return 0;
}
#define RX_TIMEOUT 1000000
static int lpc32xx_eth_recv(struct eth_device *dev)
{
struct lpc32xx_eth_device *lpc32xx_eth_device =
container_of(dev, struct lpc32xx_eth_device, dev);
struct lpc32xx_eth_registers *regs = lpc32xx_eth_device->regs;
struct lpc32xx_eth_buffers *bufs = lpc32xx_eth_device->bufs;
int timeout, rx_index;
/* time out if receive descriptor array remains empty too long */
timeout = RX_TIMEOUT;
while (readl(&regs->rxproduceindex) == readl(&regs->rxconsumeindex)) {
if (timeout-- == 0)
return -1;
}
/* determine next receive packet index to use */
rx_index = readl(&regs->rxconsumeindex);
/* if data was valid, pass it on */
if (!(bufs->rx_stat[rx_index].statusinfo & RX_STAT_ERRORS)) {
net_process_received_packet(
&(bufs->rx_buf[rx_index * PKTSIZE_ALIGN]),
(bufs->rx_stat[rx_index].statusinfo
& RX_STAT_RXSIZE) + 1);
}
/* pass receive slot back to DMA engine */
rx_index = (rx_index + 1) % RX_BUF_COUNT;
writel(rx_index, &regs->rxconsumeindex);
/* reception successful */
return 0;
}
static int lpc32xx_eth_write_hwaddr(struct eth_device *dev)
{
struct lpc32xx_eth_device *lpc32xx_eth_device =
container_of(dev, struct lpc32xx_eth_device, dev);
struct lpc32xx_eth_registers *regs = lpc32xx_eth_device->regs;
/* Save station address */
writel((unsigned long) (dev->enetaddr[0] |
(dev->enetaddr[1] << 8)), &regs->sa2);
writel((unsigned long) (dev->enetaddr[2] |
(dev->enetaddr[3] << 8)), &regs->sa1);
writel((unsigned long) (dev->enetaddr[4] |
(dev->enetaddr[5] << 8)), &regs->sa0);
return 0;
}
static int lpc32xx_eth_init(struct eth_device *dev)
{
struct lpc32xx_eth_device *lpc32xx_eth_device =
container_of(dev, struct lpc32xx_eth_device, dev);
struct lpc32xx_eth_registers *regs = lpc32xx_eth_device->regs;
struct lpc32xx_eth_buffers *bufs = lpc32xx_eth_device->bufs;
int index;
/* Initial MAC initialization */
writel(MAC1_PASS_ALL_RX_FRAMES, &regs->mac1);
writel(MAC2_PAD_CRC_ENABLE | MAC2_CRC_ENABLE, &regs->mac2);
writel(PKTSIZE_ALIGN, &regs->maxf);
/* Retries: 15 (0xF). Collision window: 57 (0x37). */
writel(0x370F, &regs->clrt);
/* Set IP gap pt 2 to default 0x12 but pt 1 to non-default 0 */
writel(0x0012, &regs->ipgr);
/* pass runt (smaller than 64 bytes) frames */
if (lpc32xx_eth_device->phy_rmii)
writel(COMMAND_PASSRUNTFRAME | COMMAND_RMII, &regs->command);
else
writel(COMMAND_PASSRUNTFRAME, &regs->command);
/* Configure Full/Half Duplex mode */
if (miiphy_duplex(dev->name, CONFIG_PHY_ADDR) == FULL) {
setbits_le32(&regs->mac2, MAC2_FULL_DUPLEX);
setbits_le32(&regs->command, COMMAND_FULL_DUPLEX);
writel(0x15, &regs->ipgt);
} else {
writel(0x12, &regs->ipgt);
}
/* Configure 100MBit/10MBit mode */
if (miiphy_speed(dev->name, CONFIG_PHY_ADDR) == _100BASET)
writel(SUPP_SPEED, &regs->supp);
else
writel(0, &regs->supp);
/* Save station address */
writel((unsigned long) (dev->enetaddr[0] |
(dev->enetaddr[1] << 8)), &regs->sa2);
writel((unsigned long) (dev->enetaddr[2] |
(dev->enetaddr[3] << 8)), &regs->sa1);
writel((unsigned long) (dev->enetaddr[4] |
(dev->enetaddr[5] << 8)), &regs->sa0);
/* set up transmit buffers */
for (index = 0; index < TX_BUF_COUNT; index++) {
bufs->tx_desc[index].control = 0;
bufs->tx_stat[index].statusinfo = 0;
}
writel((u32)(&bufs->tx_desc), (u32 *)&regs->txdescriptor);
writel((u32)(&bufs->tx_stat), &regs->txstatus);
writel(TX_BUF_COUNT-1, &regs->txdescriptornumber);
/* set up receive buffers */
for (index = 0; index < RX_BUF_COUNT; index++) {
bufs->rx_desc[index].packet =
(u32) (bufs->rx_buf+index*PKTSIZE_ALIGN);
bufs->rx_desc[index].control = PKTSIZE_ALIGN - 1;
bufs->rx_stat[index].statusinfo = 0;
bufs->rx_stat[index].statushashcrc = 0;
}
writel((u32)(&bufs->rx_desc), &regs->rxdescriptor);
writel((u32)(&bufs->rx_stat), &regs->rxstatus);
writel(RX_BUF_COUNT-1, &regs->rxdescriptornumber);
/* set up transmit buffers */
for (index = 0; index < TX_BUF_COUNT; index++)
bufs->tx_desc[index].packet =
(u32)(bufs->tx_buf + index * PKTSIZE_ALIGN);
/* Enable broadcast and matching address packets */
writel(RXFILTERCTRL_ACCEPTBROADCAST |
RXFILTERCTRL_ACCEPTPERFECT, &regs->rxfilterctrl);
/* Clear and disable interrupts */
writel(0xFFFF, &regs->intclear);
writel(0, &regs->intenable);
/* Enable receive and transmit mode of MAC ethernet core */
setbits_le32(&regs->command, COMMAND_RXENABLE | COMMAND_TXENABLE);
setbits_le32(&regs->mac1, MAC1_RECV_ENABLE);
/*
* Perform a 'dummy' first send to work around Ethernet.1
* erratum (see ES_LPC3250 rev. 9 dated 1 June 2011).
* Use zeroed "index" variable as the dummy.
*/
index = 0;
lpc32xx_eth_send(dev, &index, 4);
return 0;
}
static int lpc32xx_eth_halt(struct eth_device *dev)
{
struct lpc32xx_eth_device *lpc32xx_eth_device =
container_of(dev, struct lpc32xx_eth_device, dev);
struct lpc32xx_eth_registers *regs = lpc32xx_eth_device->regs;
/* Reset all MAC logic */
writel(MAC1_RESETS, &regs->mac1);
writel(COMMAND_RESETS, &regs->command);
/* Let reset condition settle */
udelay(2000);
return 0;
}
#if defined(CONFIG_PHYLIB)
int lpc32xx_eth_phylib_init(struct eth_device *dev, int phyid)
{
struct lpc32xx_eth_device *lpc32xx_eth_device =
container_of(dev, struct lpc32xx_eth_device, dev);
struct mii_dev *bus;
struct phy_device *phydev;
int ret;
bus = mdio_alloc();
if (!bus) {
printf("mdio_alloc failed\n");
return -ENOMEM;
}
bus->read = mii_reg_read;
bus->write = mii_reg_write;
strcpy(bus->name, dev->name);
ret = mdio_register(bus);
if (ret) {
printf("mdio_register failed\n");
free(bus);
return -ENOMEM;
}
if (lpc32xx_eth_device->phy_rmii)
phydev = phy_connect(bus, phyid, dev, PHY_INTERFACE_MODE_RMII);
else
phydev = phy_connect(bus, phyid, dev, PHY_INTERFACE_MODE_MII);
if (!phydev) {
printf("phy_connect failed\n");
return -ENODEV;
}
phy_config(phydev);
phy_startup(phydev);
return 0;
}
#endif
int lpc32xx_eth_initialize(struct bd_info *bis)
{
struct eth_device *dev = &lpc32xx_eth.dev;
struct lpc32xx_eth_registers *regs = lpc32xx_eth.regs;
/*
* Set RMII management clock rate. With HCLK at 104 MHz and
* a divider of 28, this will be 3.72 MHz.
*/
writel(MCFG_RESET_MII_MGMT, &regs->mcfg);
writel(MCFG_CLOCK_SELECT_DIV28, &regs->mcfg);
/* Reset all MAC logic */
writel(MAC1_RESETS, &regs->mac1);
writel(COMMAND_RESETS, &regs->command);
/* wait 10 ms for the whole I/F to reset */
udelay(10000);
/* must be less than sizeof(dev->name) */
strcpy(dev->name, "eth0");
dev->init = (void *)lpc32xx_eth_init;
dev->halt = (void *)lpc32xx_eth_halt;
dev->send = (void *)lpc32xx_eth_send;
dev->recv = (void *)lpc32xx_eth_recv;
dev->write_hwaddr = (void *)lpc32xx_eth_write_hwaddr;
/* Release SOFT reset to let MII talk to PHY */
clrbits_le32(&regs->mac1, MAC1_SOFT_RESET);
/* register driver before talking to phy */
eth_register(dev);
#if defined(CONFIG_PHYLIB)
lpc32xx_eth_phylib_init(dev, CONFIG_PHY_ADDR);
#elif defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
int retval;
struct mii_dev *mdiodev = mdio_alloc();
if (!mdiodev)
return -ENOMEM;
strlcpy(mdiodev->name, dev->name, MDIO_NAME_LEN);
mdiodev->read = mii_reg_read;
mdiodev->write = mii_reg_write;
retval = mdio_register(mdiodev);
if (retval < 0)
return retval;
#endif
return 0;
}
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