memac_phy.c
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/*
* Copyright 2012 Freescale Semiconductor, Inc.
* Andy Fleming <afleming@gmail.com>
* Roy Zang <tie-fei.zang@freescale.com>
*
* SPDX-License-Identifier: GPL-2.0+
* Some part is taken from tsec.c
*/
#include <common.h>
#include <miiphy.h>
#include <phy.h>
#include <asm/io.h>
#include <asm/fsl_memac.h>
#include <fm_eth.h>
/*
* Write value to the PHY for this device to the register at regnum, waiting
* until the write is done before it returns. All PHY configuration has to be
* done through the TSEC1 MIIM regs
*/
int memac_mdio_write(struct mii_dev *bus, int port_addr, int dev_addr,
int regnum, u16 value)
{
u32 mdio_ctl;
struct memac_mdio_controller *regs = bus->priv;
u32 c45 = 1; /* Default to 10G interface */
if (dev_addr == MDIO_DEVAD_NONE) {
c45 = 0; /* clause 22 */
dev_addr = regnum & 0x1f;
clrbits_be32(®s->mdio_stat, MDIO_STAT_ENC);
} else
setbits_be32(®s->mdio_stat, MDIO_STAT_ENC);
/* Wait till the bus is free */
while ((in_be32(®s->mdio_stat)) & MDIO_STAT_BSY)
;
/* Set the port and dev addr */
mdio_ctl = MDIO_CTL_PORT_ADDR(port_addr) | MDIO_CTL_DEV_ADDR(dev_addr);
out_be32(®s->mdio_ctl, mdio_ctl);
/* Set the register address */
if (c45)
out_be32(®s->mdio_addr, regnum & 0xffff);
/* Wait till the bus is free */
while ((in_be32(®s->mdio_stat)) & MDIO_STAT_BSY)
;
/* Write the value to the register */
out_be32(®s->mdio_data, MDIO_DATA(value));
/* Wait till the MDIO write is complete */
while ((in_be32(®s->mdio_data)) & MDIO_DATA_BSY)
;
return 0;
}
/*
* Reads from register regnum in the PHY for device dev, returning the value.
* Clears miimcom first. All PHY configuration has to be done through the
* TSEC1 MIIM regs
*/
int memac_mdio_read(struct mii_dev *bus, int port_addr, int dev_addr,
int regnum)
{
u32 mdio_ctl;
struct memac_mdio_controller *regs = bus->priv;
u32 c45 = 1;
if (dev_addr == MDIO_DEVAD_NONE) {
c45 = 0; /* clause 22 */
dev_addr = regnum & 0x1f;
clrbits_be32(®s->mdio_stat, MDIO_STAT_ENC);
} else
setbits_be32(®s->mdio_stat, MDIO_STAT_ENC);
/* Wait till the bus is free */
while ((in_be32(®s->mdio_stat)) & MDIO_STAT_BSY)
;
/* Set the Port and Device Addrs */
mdio_ctl = MDIO_CTL_PORT_ADDR(port_addr) | MDIO_CTL_DEV_ADDR(dev_addr);
out_be32(®s->mdio_ctl, mdio_ctl);
/* Set the register address */
if (c45)
out_be32(®s->mdio_addr, regnum & 0xffff);
/* Wait till the bus is free */
while ((in_be32(®s->mdio_stat)) & MDIO_STAT_BSY)
;
/* Initiate the read */
mdio_ctl |= MDIO_CTL_READ;
out_be32(®s->mdio_ctl, mdio_ctl);
/* Wait till the MDIO write is complete */
while ((in_be32(®s->mdio_data)) & MDIO_DATA_BSY)
;
/* Return all Fs if nothing was there */
if (in_be32(®s->mdio_stat) & MDIO_STAT_RD_ER)
return 0xffff;
return in_be32(®s->mdio_data) & 0xffff;
}
int memac_mdio_reset(struct mii_dev *bus)
{
return 0;
}
int fm_memac_mdio_init(bd_t *bis, struct memac_mdio_info *info)
{
struct mii_dev *bus = mdio_alloc();
if (!bus) {
printf("Failed to allocate FM TGEC MDIO bus\n");
return -1;
}
bus->read = memac_mdio_read;
bus->write = memac_mdio_write;
bus->reset = memac_mdio_reset;
sprintf(bus->name, info->name);
bus->priv = info->regs;
/*
* On some platforms like B4860, default value of MDIO_CLK_DIV bits
* in mdio_stat(mdio_cfg) register generates MDIO clock too high
* (much higher than 2.5MHz), violating the IEEE specs.
* On other platforms like T1040, default value of MDIO_CLK_DIV bits
* is zero, so MDIO clock is disabled.
* So, for proper functioning of MDIO, MDIO_CLK_DIV bits needs to
* be properly initialized.
*/
setbits_be32(&((struct memac_mdio_controller *)info->regs)->mdio_stat,
MDIO_STAT_CLKDIV(258));
return mdio_register(bus);
}