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// SPDX-License-Identifier: GPL-2.0+
/*
* Qualcomm IPQ4019 MDIO driver
*
* Copyright (c) 2020 Sartura Ltd.
*
* Author: Luka Kovacic <luka.kovacic@sartura.hr>
* Author: Robert Marko <robert.marko@sartura.hr>
*
* Based on Linux driver
*/
#include <asm/io.h>
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <linux/bitops.h>
#include <linux/iopoll.h>
#include <miiphy.h>
#include <phy.h>
#define MDIO_MODE_REG 0x40
#define MDIO_ADDR_REG 0x44
#define MDIO_DATA_WRITE_REG 0x48
#define MDIO_DATA_READ_REG 0x4c
#define MDIO_CMD_REG 0x50
#define MDIO_CMD_ACCESS_BUSY BIT(16)
#define MDIO_CMD_ACCESS_START BIT(8)
#define MDIO_CMD_ACCESS_CODE_READ 0
#define MDIO_CMD_ACCESS_CODE_WRITE 1
/* 0 = Clause 22, 1 = Clause 45 */
#define MDIO_MODE_BIT BIT(8)
#define IPQ4019_MDIO_TIMEOUT 10000
#define IPQ4019_MDIO_SLEEP 10
struct ipq4019_mdio_priv {
phys_addr_t mdio_base;
};
static int ipq4019_mdio_wait_busy(struct ipq4019_mdio_priv *priv)
{
unsigned int busy;
return readl_poll_sleep_timeout(priv->mdio_base + MDIO_CMD_REG, busy,
(busy & MDIO_CMD_ACCESS_BUSY) == 0, IPQ4019_MDIO_SLEEP,
IPQ4019_MDIO_TIMEOUT);
}
int ipq4019_mdio_read(struct udevice *dev, int addr, int devad, int reg)
{
struct ipq4019_mdio_priv *priv = dev_get_priv(dev);
unsigned int cmd;
if (ipq4019_mdio_wait_busy(priv))
return -ETIMEDOUT;
/* Issue the phy address and reg */
writel((addr << 8) | reg, priv->mdio_base + MDIO_ADDR_REG);
cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_READ;
/* Issue read command */
writel(cmd, priv->mdio_base + MDIO_CMD_REG);
/* Wait read complete */
if (ipq4019_mdio_wait_busy(priv))
return -ETIMEDOUT;
/* Read and return data */
return readl(priv->mdio_base + MDIO_DATA_READ_REG);
}
int ipq4019_mdio_write(struct udevice *dev, int addr, int devad,
int reg, u16 val)
{
struct ipq4019_mdio_priv *priv = dev_get_priv(dev);
unsigned int cmd;
if (ipq4019_mdio_wait_busy(priv))
return -ETIMEDOUT;
/* Issue the phy addreass and reg */
writel((addr << 8) | reg, priv->mdio_base + MDIO_ADDR_REG);
/* Issue write data */
writel(val, priv->mdio_base + MDIO_DATA_WRITE_REG);
cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_WRITE;
/* Issue write command */
writel(cmd, priv->mdio_base + MDIO_CMD_REG);
/* Wait for write complete */
if (ipq4019_mdio_wait_busy(priv))
return -ETIMEDOUT;
return 0;
}
static const struct mdio_ops ipq4019_mdio_ops = {
.read = ipq4019_mdio_read,
.write = ipq4019_mdio_write,
};
static int ipq4019_mdio_bind(struct udevice *dev)
{
if (ofnode_valid(dev_ofnode(dev)))
device_set_name(dev, ofnode_get_name(dev_ofnode(dev)));
return 0;
}
static int ipq4019_mdio_probe(struct udevice *dev)
{
struct ipq4019_mdio_priv *priv = dev_get_priv(dev);
unsigned int data;
priv->mdio_base = dev_read_addr(dev);
if (priv->mdio_base == FDT_ADDR_T_NONE)
return -EINVAL;
/* Enter Clause 22 mode */
data = readl(priv->mdio_base + MDIO_MODE_REG);
data &= ~MDIO_MODE_BIT;
writel(data, priv->mdio_base + MDIO_MODE_REG);
return 0;
}
static const struct udevice_id ipq4019_mdio_ids[] = {
{ .compatible = "qcom,ipq4019-mdio", },
{ }
};
U_BOOT_DRIVER(ipq4019_mdio) = {
.name = "ipq4019_mdio",
.id = UCLASS_MDIO,
.of_match = ipq4019_mdio_ids,
.bind = ipq4019_mdio_bind,
.probe = ipq4019_mdio_probe,
.ops = &ipq4019_mdio_ops,
.priv_auto = sizeof(struct ipq4019_mdio_priv),
};
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