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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2014
* Dirk Eibach, Guntermann & Drunck GmbH, dirk.eibach@gdsys.cc
*/
#include <common.h>
#include <linux/delay.h>
#include <miiphy.h>
#ifdef CONFIG_GDSYS_LEGACY_DRIVERS
#include <gdsys_fpga.h>
#else
#include <fdtdec.h>
#include <dm.h>
#include <regmap.h>
#endif
#include "ihs_mdio.h"
#ifndef CONFIG_GDSYS_LEGACY_DRIVERS
enum {
REG_MDIO_CONTROL = 0x0,
REG_MDIO_ADDR_DATA = 0x2,
REG_MDIO_RX_DATA = 0x4,
};
static inline u16 read_reg(struct udevice *fpga, uint base, uint addr)
{
struct regmap *map;
u8 *ptr;
regmap_init_mem(dev_ofnode(fpga), &map);
ptr = regmap_get_range(map, 0);
return in_le16((u16 *)(ptr + base + addr));
}
static inline void write_reg(struct udevice *fpga, uint base, uint addr,
u16 val)
{
struct regmap *map;
u8 *ptr;
regmap_init_mem(dev_ofnode(fpga), &map);
ptr = regmap_get_range(map, 0);
out_le16((u16 *)(ptr + base + addr), val);
}
#endif
static inline u16 read_control(struct ihs_mdio_info *info)
{
u16 val;
#ifdef CONFIG_GDSYS_LEGACY_DRIVERS
FPGA_GET_REG(info->fpga, mdio.control, &val);
#else
val = read_reg(info->fpga, info->base, REG_MDIO_CONTROL);
#endif
return val;
}
static inline void write_control(struct ihs_mdio_info *info, u16 val)
{
#ifdef CONFIG_GDSYS_LEGACY_DRIVERS
FPGA_SET_REG(info->fpga, mdio.control, val);
#else
write_reg(info->fpga, info->base, REG_MDIO_CONTROL, val);
#endif
}
static inline void write_addr_data(struct ihs_mdio_info *info, u16 val)
{
#ifdef CONFIG_GDSYS_LEGACY_DRIVERS
FPGA_SET_REG(info->fpga, mdio.address_data, val);
#else
write_reg(info->fpga, info->base, REG_MDIO_ADDR_DATA, val);
#endif
}
static inline u16 read_rx_data(struct ihs_mdio_info *info)
{
u16 val;
#ifdef CONFIG_GDSYS_LEGACY_DRIVERS
FPGA_GET_REG(info->fpga, mdio.rx_data, &val);
#else
val = read_reg(info->fpga, info->base, REG_MDIO_RX_DATA);
#endif
return val;
}
static int ihs_mdio_idle(struct mii_dev *bus)
{
struct ihs_mdio_info *info = bus->priv;
u16 val;
unsigned int ctr = 0;
do {
val = read_control(info);
udelay(100);
if (ctr++ > 10)
return -1;
} while (!(val & (1 << 12)));
return 0;
}
static int ihs_mdio_reset(struct mii_dev *bus)
{
ihs_mdio_idle(bus);
return 0;
}
static int ihs_mdio_read(struct mii_dev *bus, int addr, int dev_addr,
int regnum)
{
struct ihs_mdio_info *info = bus->priv;
u16 val;
ihs_mdio_idle(bus);
write_control(info,
((addr & 0x1f) << 5) | (regnum & 0x1f) | (2 << 10));
/* wait for rx data available */
udelay(100);
val = read_rx_data(info);
return val;
}
static int ihs_mdio_write(struct mii_dev *bus, int addr, int dev_addr,
int regnum, u16 value)
{
struct ihs_mdio_info *info = bus->priv;
ihs_mdio_idle(bus);
write_addr_data(info, value);
write_control(info, ((addr & 0x1f) << 5) | (regnum & 0x1f) | (1 << 10));
return 0;
}
int ihs_mdio_init(struct ihs_mdio_info *info)
{
struct mii_dev *bus = mdio_alloc();
if (!bus) {
printf("Failed to allocate FSL MDIO bus\n");
return -1;
}
bus->read = ihs_mdio_read;
bus->write = ihs_mdio_write;
bus->reset = ihs_mdio_reset;
strcpy(bus->name, info->name);
bus->priv = info;
return mdio_register(bus);
}
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