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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2009 Industrie Dial Face S.p.A.
* Luigi 'Comio' Mantellini <luigi.mantellini@idf-hit.com>
*
* (C) Copyright 2001
* Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com.
*/
/*
* This provides a bit-banged interface to the ethernet MII management
* channel.
*/
#include <common.h>
#include <ioports.h>
#include <ppc_asm.tmpl>
#include <miiphy.h>
#include <asm/global_data.h>
#ifndef CONFIG_BITBANGMII_MULTI
/*
* If CONFIG_BITBANGMII_MULTI is not defined we use a
* compatibility layer with the previous miiphybb implementation
* based on macros usage.
*
*/
static int bb_mii_init_wrap(struct bb_miiphy_bus *bus)
{
#ifdef MII_INIT
MII_INIT;
#endif
return 0;
}
static int bb_mdio_active_wrap(struct bb_miiphy_bus *bus)
{
#ifdef MDIO_DECLARE
MDIO_DECLARE;
#endif
MDIO_ACTIVE;
return 0;
}
static int bb_mdio_tristate_wrap(struct bb_miiphy_bus *bus)
{
#ifdef MDIO_DECLARE
MDIO_DECLARE;
#endif
MDIO_TRISTATE;
return 0;
}
static int bb_set_mdio_wrap(struct bb_miiphy_bus *bus, int v)
{
#ifdef MDIO_DECLARE
MDIO_DECLARE;
#endif
MDIO(v);
return 0;
}
static int bb_get_mdio_wrap(struct bb_miiphy_bus *bus, int *v)
{
#ifdef MDIO_DECLARE
MDIO_DECLARE;
#endif
*v = MDIO_READ;
return 0;
}
static int bb_set_mdc_wrap(struct bb_miiphy_bus *bus, int v)
{
#ifdef MDC_DECLARE
MDC_DECLARE;
#endif
MDC(v);
return 0;
}
static int bb_delay_wrap(struct bb_miiphy_bus *bus)
{
MIIDELAY;
return 0;
}
struct bb_miiphy_bus bb_miiphy_buses[] = {
{
.name = BB_MII_DEVNAME,
.init = bb_mii_init_wrap,
.mdio_active = bb_mdio_active_wrap,
.mdio_tristate = bb_mdio_tristate_wrap,
.set_mdio = bb_set_mdio_wrap,
.get_mdio = bb_get_mdio_wrap,
.set_mdc = bb_set_mdc_wrap,
.delay = bb_delay_wrap,
}
};
int bb_miiphy_buses_num = sizeof(bb_miiphy_buses) /
sizeof(bb_miiphy_buses[0]);
#endif
int bb_miiphy_init(void)
{
int i;
for (i = 0; i < bb_miiphy_buses_num; i++)
if (bb_miiphy_buses[i].init != NULL)
bb_miiphy_buses[i].init(&bb_miiphy_buses[i]);
return 0;
}
static inline struct bb_miiphy_bus *bb_miiphy_getbus(const char *devname)
{
#ifdef CONFIG_BITBANGMII_MULTI
int i;
/* Search the correct bus */
for (i = 0; i < bb_miiphy_buses_num; i++) {
if (!strcmp(bb_miiphy_buses[i].name, devname)) {
return &bb_miiphy_buses[i];
}
}
return NULL;
#else
/* We have just one bitbanging bus */
return &bb_miiphy_buses[0];
#endif
}
/*****************************************************************************
*
* Utility to send the preamble, address, and register (common to read
* and write).
*/
static void miiphy_pre(struct bb_miiphy_bus *bus, char read,
unsigned char addr, unsigned char reg)
{
int j;
/*
* Send a 32 bit preamble ('1's) with an extra '1' bit for good measure.
* The IEEE spec says this is a PHY optional requirement. The AMD
* 79C874 requires one after power up and one after a MII communications
* error. This means that we are doing more preambles than we need,
* but it is safer and will be much more robust.
*/
bus->mdio_active(bus);
bus->set_mdio(bus, 1);
for (j = 0; j < 32; j++) {
bus->set_mdc(bus, 0);
bus->delay(bus);
bus->set_mdc(bus, 1);
bus->delay(bus);
}
/* send the start bit (01) and the read opcode (10) or write (10) */
bus->set_mdc(bus, 0);
bus->set_mdio(bus, 0);
bus->delay(bus);
bus->set_mdc(bus, 1);
bus->delay(bus);
bus->set_mdc(bus, 0);
bus->set_mdio(bus, 1);
bus->delay(bus);
bus->set_mdc(bus, 1);
bus->delay(bus);
bus->set_mdc(bus, 0);
bus->set_mdio(bus, read);
bus->delay(bus);
bus->set_mdc(bus, 1);
bus->delay(bus);
bus->set_mdc(bus, 0);
bus->set_mdio(bus, !read);
bus->delay(bus);
bus->set_mdc(bus, 1);
bus->delay(bus);
/* send the PHY address */
for (j = 0; j < 5; j++) {
bus->set_mdc(bus, 0);
if ((addr & 0x10) == 0) {
bus->set_mdio(bus, 0);
} else {
bus->set_mdio(bus, 1);
}
bus->delay(bus);
bus->set_mdc(bus, 1);
bus->delay(bus);
addr <<= 1;
}
/* send the register address */
for (j = 0; j < 5; j++) {
bus->set_mdc(bus, 0);
if ((reg & 0x10) == 0) {
bus->set_mdio(bus, 0);
} else {
bus->set_mdio(bus, 1);
}
bus->delay(bus);
bus->set_mdc(bus, 1);
bus->delay(bus);
reg <<= 1;
}
}
/*****************************************************************************
*
* Read a MII PHY register.
*
* Returns:
* 0 on success
*/
int bb_miiphy_read(struct mii_dev *miidev, int addr, int devad, int reg)
{
unsigned short rdreg; /* register working value */
int v;
int j; /* counter */
struct bb_miiphy_bus *bus;
bus = bb_miiphy_getbus(miidev->name);
if (bus == NULL) {
return -1;
}
miiphy_pre (bus, 1, addr, reg);
/* tri-state our MDIO I/O pin so we can read */
bus->set_mdc(bus, 0);
bus->mdio_tristate(bus);
bus->delay(bus);
bus->set_mdc(bus, 1);
bus->delay(bus);
/* check the turnaround bit: the PHY should be driving it to zero */
bus->get_mdio(bus, &v);
if (v != 0) {
/* puts ("PHY didn't drive TA low\n"); */
for (j = 0; j < 32; j++) {
bus->set_mdc(bus, 0);
bus->delay(bus);
bus->set_mdc(bus, 1);
bus->delay(bus);
}
/* There is no PHY, return */
return -1;
}
bus->set_mdc(bus, 0);
bus->delay(bus);
/* read 16 bits of register data, MSB first */
rdreg = 0;
for (j = 0; j < 16; j++) {
bus->set_mdc(bus, 1);
bus->delay(bus);
rdreg <<= 1;
bus->get_mdio(bus, &v);
rdreg |= (v & 0x1);
bus->set_mdc(bus, 0);
bus->delay(bus);
}
bus->set_mdc(bus, 1);
bus->delay(bus);
bus->set_mdc(bus, 0);
bus->delay(bus);
bus->set_mdc(bus, 1);
bus->delay(bus);
#ifdef DEBUG
printf("miiphy_read(0x%x) @ 0x%x = 0x%04x\n", reg, addr, rdreg);
#endif
return rdreg;
}
/*****************************************************************************
*
* Write a MII PHY register.
*
* Returns:
* 0 on success
*/
int bb_miiphy_write(struct mii_dev *miidev, int addr, int devad, int reg,
u16 value)
{
struct bb_miiphy_bus *bus;
int j; /* counter */
bus = bb_miiphy_getbus(miidev->name);
if (bus == NULL) {
/* Bus not found! */
return -1;
}
miiphy_pre (bus, 0, addr, reg);
/* send the turnaround (10) */
bus->set_mdc(bus, 0);
bus->set_mdio(bus, 1);
bus->delay(bus);
bus->set_mdc(bus, 1);
bus->delay(bus);
bus->set_mdc(bus, 0);
bus->set_mdio(bus, 0);
bus->delay(bus);
bus->set_mdc(bus, 1);
bus->delay(bus);
/* write 16 bits of register data, MSB first */
for (j = 0; j < 16; j++) {
bus->set_mdc(bus, 0);
if ((value & 0x00008000) == 0) {
bus->set_mdio(bus, 0);
} else {
bus->set_mdio(bus, 1);
}
bus->delay(bus);
bus->set_mdc(bus, 1);
bus->delay(bus);
value <<= 1;
}
/*
* Tri-state the MDIO line.
*/
bus->mdio_tristate(bus);
bus->set_mdc(bus, 0);
bus->delay(bus);
bus->set_mdc(bus, 1);
bus->delay(bus);
return 0;
}
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