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// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
/*
* Copyright (c) 2018 Microsemi Corporation
*/
#include <common.h>
#include <log.h>
#include <asm/io.h>
int mscc_phy_rd_wr(u8 read,
u32 miimdev,
u8 miim_addr,
u8 addr,
u16 *value)
{
u32 data;
int i;
/* Command part */
data = (read ? MSCC_F_MII_CMD_MIIM_CMD_OPR_FIELD(2) : /* Read */
MSCC_F_MII_CMD_MIIM_CMD_OPR_FIELD(1) | /* Write */
MSCC_F_MII_CMD_MIIM_CMD_WRDATA(*value)); /* value */
/* Addressing part */
data |=
MSCC_F_MII_CMD_MIIM_CMD_VLD(1) | /* Valid command */
MSCC_F_MII_CMD_MIIM_CMD_REGAD(addr) | /* Reg addr */
MSCC_F_MII_CMD_MIIM_CMD_PHYAD(miim_addr); /* Miim addr */
/* Enqueue MIIM operation to be executed */
writel(data, BASE_DEVCPU_GCB + MIIM_MII_CMD(miimdev));
/* Wait for MIIM operation to finish */
i = 0;
do {
if (i++ > 100) {
debug("Miim timeout");
return -1;
}
data = readl(BASE_DEVCPU_GCB + MIIM_MII_STATUS(miimdev));
debug("Read status miim(%d): 0x%08x\n", miimdev, data);
} while (data & MSCC_F_MII_STATUS_MIIM_STAT_BUSY(1));
if (read) {
data = readl(BASE_DEVCPU_GCB + MIIM_MII_DATA(miimdev));
if (data & MSCC_M_MII_DATA_MIIM_DATA_SUCCESS) {
debug("Read(%d, %d) returned 0x%08x\n",
miim_addr, addr, data);
return -1;
}
*value = MSCC_X_MII_DATA_MIIM_DATA_RDDATA(data);
}
return 0;
}
int mscc_phy_rd(u32 miimdev,
u8 miim_addr,
u8 addr,
u16 *value)
{
if (mscc_phy_rd_wr(1, miimdev, miim_addr, addr, value) == 0)
return 0;
debug("Read(%d, %d) returned error\n", miim_addr, addr);
return -1;
}
int mscc_phy_wr(u32 miimdev,
u8 miim_addr,
u8 addr,
u16 value)
{
return mscc_phy_rd_wr(0, miimdev, miim_addr, addr, &value);
}
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