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// SPDX-License-Identifier: GPL-2.0
/* Copyright Sunplus Technology Co., Ltd.
* All rights reserved.
*/
#include <linux/platform_device.h>
#include <linux/netdevice.h>
#include <linux/bitfield.h>
#include <linux/of_mdio.h>
#include "spl2sw_register.h"
#include "spl2sw_define.h"
#include "spl2sw_mdio.h"
#define SPL2SW_MDIO_READ_CMD 0x02
#define SPL2SW_MDIO_WRITE_CMD 0x01
static int spl2sw_mdio_access(struct spl2sw_common *comm, u8 cmd, u8 addr, u8 regnum, u16 wdata)
{
u32 reg, reg2;
u32 val;
int ret;
/* Note that addr (of phy) should match either ext_phy0_addr
* or ext_phy1_addr, or mdio commands won't be sent out.
*/
reg = readl(comm->l2sw_reg_base + L2SW_MAC_FORCE_MODE);
reg &= ~MAC_EXT_PHY0_ADDR;
reg |= FIELD_PREP(MAC_EXT_PHY0_ADDR, addr);
reg2 = FIELD_PREP(MAC_CPU_PHY_WT_DATA, wdata) | FIELD_PREP(MAC_CPU_PHY_CMD, cmd) |
FIELD_PREP(MAC_CPU_PHY_REG_ADDR, regnum) | FIELD_PREP(MAC_CPU_PHY_ADDR, addr);
/* Set ext_phy0_addr and then issue mdio command.
* No interrupt is allowed in between.
*/
spin_lock_irq(&comm->mdio_lock);
writel(reg, comm->l2sw_reg_base + L2SW_MAC_FORCE_MODE);
writel(reg2, comm->l2sw_reg_base + L2SW_PHY_CNTL_REG0);
spin_unlock_irq(&comm->mdio_lock);
ret = read_poll_timeout(readl, val, val & cmd, 1, 1000, true,
comm->l2sw_reg_base + L2SW_PHY_CNTL_REG1);
/* Set ext_phy0_addr back to 31 to prevent
* from sending mdio command to phy by
* hardware auto-mdio function.
*/
reg = readl(comm->l2sw_reg_base + L2SW_MAC_FORCE_MODE);
reg &= ~MAC_EXT_PHY0_ADDR;
reg |= FIELD_PREP(MAC_EXT_PHY0_ADDR, 31);
writel(reg, comm->l2sw_reg_base + L2SW_MAC_FORCE_MODE);
if (ret == 0)
return val >> 16;
else
return ret;
}
static int spl2sw_mii_read(struct mii_bus *bus, int addr, int regnum)
{
struct spl2sw_common *comm = bus->priv;
if (regnum & MII_ADDR_C45)
return -EOPNOTSUPP;
return spl2sw_mdio_access(comm, SPL2SW_MDIO_READ_CMD, addr, regnum, 0);
}
static int spl2sw_mii_write(struct mii_bus *bus, int addr, int regnum, u16 val)
{
struct spl2sw_common *comm = bus->priv;
int ret;
if (regnum & MII_ADDR_C45)
return -EOPNOTSUPP;
ret = spl2sw_mdio_access(comm, SPL2SW_MDIO_WRITE_CMD, addr, regnum, val);
if (ret < 0)
return ret;
return 0;
}
u32 spl2sw_mdio_init(struct spl2sw_common *comm)
{
struct device_node *mdio_np;
struct mii_bus *mii_bus;
int ret;
/* Get mdio child node. */
mdio_np = of_get_child_by_name(comm->pdev->dev.of_node, "mdio");
if (!mdio_np) {
dev_err(&comm->pdev->dev, "No mdio child node found!\n");
return -ENODEV;
}
/* Allocate and register mdio bus. */
mii_bus = devm_mdiobus_alloc(&comm->pdev->dev);
if (!mii_bus)
return -ENOMEM;
mii_bus->name = "sunplus_mii_bus";
mii_bus->parent = &comm->pdev->dev;
mii_bus->priv = comm;
mii_bus->read = spl2sw_mii_read;
mii_bus->write = spl2sw_mii_write;
snprintf(mii_bus->id, MII_BUS_ID_SIZE, "%s-mii", dev_name(&comm->pdev->dev));
ret = of_mdiobus_register(mii_bus, mdio_np);
if (ret) {
dev_err(&comm->pdev->dev, "Failed to register mdiobus!\n");
return ret;
}
comm->mii_bus = mii_bus;
return ret;
}
void spl2sw_mdio_remove(struct spl2sw_common *comm)
{
if (comm->mii_bus) {
mdiobus_unregister(comm->mii_bus);
comm->mii_bus = NULL;
}
}
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