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// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
/*
* Copyright (c) 2018 Microsemi Corporation
*/
#include <miiphy.h>
#include <wait_bit.h>
#include "mscc_miim.h"
#define MIIM_STATUS 0x0
#define MIIM_STAT_BUSY BIT(3)
#define MIIM_CMD 0x8
#define MIIM_CMD_SCAN BIT(0)
#define MIIM_CMD_OPR_WRITE BIT(1)
#define MIIM_CMD_OPR_READ BIT(2)
#define MIIM_CMD_SINGLE_SCAN BIT(3)
#define MIIM_CMD_WRDATA(x) ((x) << 4)
#define MIIM_CMD_REGAD(x) ((x) << 20)
#define MIIM_CMD_PHYAD(x) ((x) << 25)
#define MIIM_CMD_VLD BIT(31)
#define MIIM_DATA 0xC
#define MIIM_DATA_ERROR (0x2 << 16)
static int mscc_miim_wait_ready(struct mscc_miim_dev *miim)
{
return wait_for_bit_le32(miim->regs + MIIM_STATUS, MIIM_STAT_BUSY,
false, 250, false);
}
int mscc_miim_read(struct mii_dev *bus, int addr, int devad, int reg)
{
struct mscc_miim_dev *miim = (struct mscc_miim_dev *)bus->priv;
u32 val;
int ret;
ret = mscc_miim_wait_ready(miim);
if (ret)
goto out;
writel(MIIM_CMD_VLD | MIIM_CMD_PHYAD(addr) |
MIIM_CMD_REGAD(reg) | MIIM_CMD_OPR_READ,
miim->regs + MIIM_CMD);
ret = mscc_miim_wait_ready(miim);
if (ret)
goto out;
val = readl(miim->regs + MIIM_DATA);
if (val & MIIM_DATA_ERROR) {
ret = -EIO;
goto out;
}
ret = val & 0xFFFF;
out:
return ret;
}
int mscc_miim_write(struct mii_dev *bus, int addr, int devad, int reg,
u16 val)
{
struct mscc_miim_dev *miim = (struct mscc_miim_dev *)bus->priv;
int ret;
ret = mscc_miim_wait_ready(miim);
if (ret < 0)
goto out;
writel(MIIM_CMD_VLD | MIIM_CMD_PHYAD(addr) |
MIIM_CMD_REGAD(reg) | MIIM_CMD_WRDATA(val) |
MIIM_CMD_OPR_WRITE, miim->regs + MIIM_CMD);
out:
return ret;
}
struct mii_dev *mscc_mdiobus_init(struct mscc_miim_dev *miim, int *miim_count,
phys_addr_t miim_base,
unsigned long miim_size)
{
struct mii_dev *bus;
bus = mdio_alloc();
if (!bus)
return NULL;
*miim_count += 1;
sprintf(bus->name, "miim-bus%d", *miim_count);
miim[*miim_count].regs = ioremap(miim_base, miim_size);
miim[*miim_count].miim_base = miim_base;
miim[*miim_count].miim_size = miim_size;
bus->priv = &miim[*miim_count];
bus->read = mscc_miim_read;
bus->write = mscc_miim_write;
if (mdio_register(bus))
return NULL;
miim[*miim_count].bus = bus;
return bus;
}
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