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- /*
- * Copyright (C) 2018 Sylvie Barlow <sylvie.c.barlow@gmail.com>.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of the
- * License, or any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- * 02110-1301, USA.
- *
- * You can also choose to distribute this program under the terms of
- * the Unmodified Binary Distribution Licence (as given in the file
- * COPYING.UBDL), provided that you have satisfied its requirements.
- */
-
- FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
-
- #include <stdint.h>
- #include <unistd.h>
- #include <ipxe/bitbash.h>
- #include <ipxe/mii_bit.h>
-
- /**
- * Transfer bits over MII bit-bashing interface
- *
- * @v basher Bit basher
- * @v mask Mask
- * @v write Data to write
- * @ret read Data read
- */
- static uint32_t mii_bit_xfer ( struct bit_basher *basher,
- uint32_t mask, uint32_t write ) {
- 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;
- }
-
- /**
- * Read or write via MII bit-bashing interface
- *
- * @v basher Bit basher
- * @v phy PHY address
- * @v reg Register address
- * @v data Data to write
- * @v cmd Command
- * @ret data Data read
- */
- static unsigned int mii_bit_rw ( struct bit_basher *basher,
- unsigned int phy, unsigned int reg,
- unsigned int data, unsigned int cmd ) {
-
- /* 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;
- }
-
- /**
- * Read from MII register
- *
- * @v mdio MII interface
- * @v phy PHY address
- * @v reg Register address
- * @ret data Data read, or negative error
- */
- static int mii_bit_read ( struct mii_interface *mdio, unsigned int phy,
- unsigned int reg ) {
- 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 );
- }
-
- /**
- * Write to MII register
- *
- * @v mdio MII interface
- * @v phy PHY address
- * @v reg Register address
- * @v data Data to write
- * @ret rc Return status code
- */
- static int mii_bit_write ( struct mii_interface *mdio, unsigned int phy,
- unsigned int reg, unsigned int data ) {
- 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;
- }
-
- /** MII bit basher operations */
- static struct mii_operations mii_bit_op = {
- .read = mii_bit_read,
- .write = mii_bit_write,
- };
-
- /**
- * Initialise bit-bashing interface
- *
- * @v miibit MII bit basher
- */
- void init_mii_bit_basher ( struct mii_bit_basher *miibit ) {
- mdio_init ( &miibit->mdio, &mii_bit_op );
- };
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