mii_bit.c File Reference

#include <stdint.h>
#include <unistd.h>
#include <ipxe/bitbash.h>
#include <ipxe/mii_bit.h>

Go to the source code of this file.

Functions
	FILE_LICENCE (GPL2_OR_LATER_OR_UBDL)
static uint32_t	mii_bit_xfer (struct bit_basher *basher, uint32_t mask, uint32_t write)
	Transfer bits over MII bit-bashing interface.
static unsigned int	mii_bit_rw (struct bit_basher *basher, unsigned int phy, unsigned int reg, unsigned int data, unsigned int cmd)
	Read or write via MII bit-bashing interface.
static int	mii_bit_read (struct mii_interface *mdio, unsigned int phy, unsigned int reg)
	Read from MII register.
static int	mii_bit_write (struct mii_interface *mdio, unsigned int phy, unsigned int reg, unsigned int data)
	Write to MII register.
void	init_mii_bit_basher (struct mii_bit_basher *miibit)
	Initialise bit-bashing interface.

Variables
static struct mii_operations	mii_bit_op
	MII bit basher operations.

Function Documentation

FILE_LICENCE()

FILE_LICENCE

(

GPL2_OR_LATER_OR_UBDL

)

mii_bit_xfer()

uint32_t mii_bit_xfer ( struct bit_basher * basher, uint32_t mask, uint32_t write )

static

Transfer bits over MII bit-bashing interface.

Parameters

basher	Bit basher
mask	Mask
write	Data to write

Return values

read

Data read

Definition at line 39 of file mii_bit.c.

                                                               {
        uint32_t read = 0;
        int bit;
 
        for ( ; mask ; mask >>= 1 ) {
 
                /* Delay */
                udelay ( 1 );
 
                /* Write bit to basher */
                write_bit ( basher, MII_BIT_MDIO, ( write & mask ) );
 
                /* Read bit from basher */
                bit = read_bit ( basher, MII_BIT_MDIO );
                read <<= 1;
                read |= ( bit & 1 );
 
                /* Set clock high */
                write_bit ( basher, MII_BIT_MDC, 1 );
 
                /* Delay */
                udelay ( 1 );
 
                /* Set clock low */
                write_bit ( basher, MII_BIT_MDC, 0 );
        }
        return read;
}

References bit, MII_BIT_MDC, MII_BIT_MDIO, read, read_bit(), udelay(), write, and write_bit().

Referenced by mii_bit_rw().

mii_bit_rw()

unsigned int mii_bit_rw ( struct bit_basher * basher, unsigned int phy, unsigned int reg, unsigned int data, unsigned int cmd )

static

Read or write via MII bit-bashing interface.

Parameters

basher	Bit basher
phy	PHY address
reg	Register address
data	Data to write
cmd	Command

Return values

data

Data read

Definition at line 79 of file mii_bit.c.

                                                                       {
 
        /* Initiate drive for write */
        write_bit ( basher, MII_BIT_DRIVE, 1 );
 
        /* Write start */
        mii_bit_xfer ( basher, MII_BIT_START_MASK, MII_BIT_START );
 
        /* Write command */
        mii_bit_xfer ( basher, MII_BIT_CMD_MASK, cmd );
 
        /* Write PHY address */
        mii_bit_xfer ( basher, MII_BIT_PHY_MASK, phy );
 
        /* Write register address */
        mii_bit_xfer ( basher, MII_BIT_REG_MASK, reg );
 
        /* Switch drive to read if applicable */
        write_bit ( basher, MII_BIT_DRIVE, ( cmd & MII_BIT_CMD_RW ) );
 
        /* Allow space for turnaround */
        mii_bit_xfer ( basher, MII_BIT_SWITCH_MASK, MII_BIT_SWITCH );
 
        /* Read or write data */
        data = mii_bit_xfer (basher, MII_BIT_DATA_MASK, data );
 
        /* Initiate drive for read */
        write_bit ( basher, MII_BIT_DRIVE, 0 );
 
        return data;
}

References cmd, data, MII_BIT_CMD_MASK, MII_BIT_CMD_RW, MII_BIT_DATA_MASK, MII_BIT_DRIVE, MII_BIT_PHY_MASK, MII_BIT_REG_MASK, MII_BIT_START, MII_BIT_START_MASK, MII_BIT_SWITCH, MII_BIT_SWITCH_MASK, mii_bit_xfer(), reg, and write_bit().

Referenced by mii_bit_read(), and mii_bit_write().

mii_bit_read()

int mii_bit_read ( struct mii_interface * mdio, unsigned int phy, unsigned int reg )

static

Read from MII register.

Parameters

mdio	MII interface
phy	PHY address
reg	Register address

Return values

data	Data read, or negative error

Definition at line 121 of file mii_bit.c.

                                             {
        struct mii_bit_basher *miibit =
                container_of ( mdio, struct mii_bit_basher, mdio );
        struct bit_basher *basher = &miibit->basher;
 
        return mii_bit_rw ( basher, phy, reg, 0, MII_BIT_CMD_READ );
}

References mii_bit_basher::basher, container_of, mii_bit_basher::mdio, MII_BIT_CMD_READ, mii_bit_rw(), and reg.

mii_bit_write()

int mii_bit_write ( struct mii_interface * mdio, unsigned int phy, unsigned int reg, unsigned int data )

static

Write to MII register.

Parameters

mdio	MII interface
phy	PHY address
reg	Register address
data	Data to write

Return values

rc	Return status code

Definition at line 139 of file mii_bit.c.

                                                                 {
        struct mii_bit_basher *miibit =
                container_of ( mdio, struct mii_bit_basher, mdio );
        struct bit_basher *basher = &miibit->basher;
 
        mii_bit_rw ( basher, phy, reg, data, MII_BIT_CMD_WRITE );
        return 0;
}

References mii_bit_basher::basher, container_of, data, mii_bit_basher::mdio, MII_BIT_CMD_WRITE, mii_bit_rw(), and reg.

init_mii_bit_basher()

void init_mii_bit_basher

(

struct mii_bit_basher *

miibit

)

Initialise bit-bashing interface.

Parameters

miibit

MII bit basher

Definition at line 160 of file mii_bit.c.

                                                           {
        mdio_init ( &miibit->mdio, &mii_bit_op );
};

References mii_bit_basher::mdio, mdio_init(), and mii_bit_op.

Referenced by icplus_probe().

Variable Documentation

mii_bit_op

struct mii_operations mii_bit_op

static

Initial value:

= {
        .read = mii_bit_read,
        .write = mii_bit_write,
}

MII bit basher operations.

Definition at line 150 of file mii_bit.c.

                                          {
        .read = mii_bit_read,
        .write = mii_bit_write,
};

Referenced by init_mii_bit_basher().