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// SPDX-License-Identifier: GPL-2.0+
/*
* Driver for ICPlus PHYs
*
* Copyright (c) 2007 Freescale Semiconductor, Inc.
*/
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/unistd.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/mii.h>
#include <linux/ethtool.h>
#include <linux/phy.h>
#include <linux/property.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <linux/uaccess.h>
MODULE_DESCRIPTION("ICPlus IP175C/IP101A/IP101G/IC1001 PHY drivers");
MODULE_AUTHOR("Michael Barkowski");
MODULE_LICENSE("GPL");
/* IP101A/G - IP1001 */
#define IP10XX_SPEC_CTRL_STATUS 16 /* Spec. Control Register */
#define IP1001_RXPHASE_SEL BIT(0) /* Add delay on RX_CLK */
#define IP1001_TXPHASE_SEL BIT(1) /* Add delay on TX_CLK */
#define IP1001_SPEC_CTRL_STATUS_2 20 /* IP1001 Spec. Control Reg 2 */
#define IP1001_APS_ON 11 /* IP1001 APS Mode bit */
#define IP101A_G_APS_ON BIT(1) /* IP101A/G APS Mode bit */
#define IP101A_G_IRQ_CONF_STATUS 0x11 /* Conf Info IRQ & Status Reg */
#define IP101A_G_IRQ_PIN_USED BIT(15) /* INTR pin used */
#define IP101A_G_IRQ_ALL_MASK BIT(11) /* IRQ's inactive */
#define IP101A_G_IRQ_SPEED_CHANGE BIT(2)
#define IP101A_G_IRQ_DUPLEX_CHANGE BIT(1)
#define IP101A_G_IRQ_LINK_CHANGE BIT(0)
#define IP101G_DIGITAL_IO_SPEC_CTRL 0x1d
#define IP101G_DIGITAL_IO_SPEC_CTRL_SEL_INTR32 BIT(2)
/* The 32-pin IP101GR package can re-configure the mode of the RXER/INTR_32 pin
* (pin number 21). The hardware default is RXER (receive error) mode. But it
* can be configured to interrupt mode manually.
*/
enum ip101gr_sel_intr32 {
IP101GR_SEL_INTR32_KEEP,
IP101GR_SEL_INTR32_INTR,
IP101GR_SEL_INTR32_RXER,
};
struct ip101a_g_phy_priv {
enum ip101gr_sel_intr32 sel_intr32;
};
static int ip175c_config_init(struct phy_device *phydev)
{
int err, i;
static int full_reset_performed;
if (full_reset_performed == 0) {
/* master reset */
err = mdiobus_write(phydev->mdio.bus, 30, 0, 0x175c);
if (err < 0)
return err;
/* ensure no bus delays overlap reset period */
err = mdiobus_read(phydev->mdio.bus, 30, 0);
/* data sheet specifies reset period is 2 msec */
mdelay(2);
/* enable IP175C mode */
err = mdiobus_write(phydev->mdio.bus, 29, 31, 0x175c);
if (err < 0)
return err;
/* Set MII0 speed and duplex (in PHY mode) */
err = mdiobus_write(phydev->mdio.bus, 29, 22, 0x420);
if (err < 0)
return err;
/* reset switch ports */
for (i = 0; i < 5; i++) {
err = mdiobus_write(phydev->mdio.bus, i,
MII_BMCR, BMCR_RESET);
if (err < 0)
return err;
}
for (i = 0; i < 5; i++)
err = mdiobus_read(phydev->mdio.bus, i, MII_BMCR);
mdelay(2);
full_reset_performed = 1;
}
if (phydev->mdio.addr != 4) {
phydev->state = PHY_RUNNING;
phydev->speed = SPEED_100;
phydev->duplex = DUPLEX_FULL;
phydev->link = 1;
netif_carrier_on(phydev->attached_dev);
}
return 0;
}
static int ip1xx_reset(struct phy_device *phydev)
{
int bmcr;
/* Software Reset PHY */
bmcr = phy_read(phydev, MII_BMCR);
if (bmcr < 0)
return bmcr;
bmcr |= BMCR_RESET;
bmcr = phy_write(phydev, MII_BMCR, bmcr);
if (bmcr < 0)
return bmcr;
do {
bmcr = phy_read(phydev, MII_BMCR);
if (bmcr < 0)
return bmcr;
} while (bmcr & BMCR_RESET);
return 0;
}
static int ip1001_config_init(struct phy_device *phydev)
{
int c;
c = ip1xx_reset(phydev);
if (c < 0)
return c;
/* Enable Auto Power Saving mode */
c = phy_read(phydev, IP1001_SPEC_CTRL_STATUS_2);
if (c < 0)
return c;
c |= IP1001_APS_ON;
c = phy_write(phydev, IP1001_SPEC_CTRL_STATUS_2, c);
if (c < 0)
return c;
if (phy_interface_is_rgmii(phydev)) {
c = phy_read(phydev, IP10XX_SPEC_CTRL_STATUS);
if (c < 0)
return c;
c &= ~(IP1001_RXPHASE_SEL | IP1001_TXPHASE_SEL);
if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID)
c |= (IP1001_RXPHASE_SEL | IP1001_TXPHASE_SEL);
else if (phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID)
c |= IP1001_RXPHASE_SEL;
else if (phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID)
c |= IP1001_TXPHASE_SEL;
c = phy_write(phydev, IP10XX_SPEC_CTRL_STATUS, c);
if (c < 0)
return c;
}
return 0;
}
static int ip175c_read_status(struct phy_device *phydev)
{
if (phydev->mdio.addr == 4) /* WAN port */
genphy_read_status(phydev);
else
/* Don't need to read status for switch ports */
phydev->irq = PHY_IGNORE_INTERRUPT;
return 0;
}
static int ip175c_config_aneg(struct phy_device *phydev)
{
if (phydev->mdio.addr == 4) /* WAN port */
genphy_config_aneg(phydev);
return 0;
}
static int ip101a_g_probe(struct phy_device *phydev)
{
struct device *dev = &phydev->mdio.dev;
struct ip101a_g_phy_priv *priv;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
/* Both functions (RX error and interrupt status) are sharing the same
* pin on the 32-pin IP101GR, so this is an exclusive choice.
*/
if (device_property_read_bool(dev, "icplus,select-rx-error") &&
device_property_read_bool(dev, "icplus,select-interrupt")) {
dev_err(dev,
"RXER and INTR mode cannot be selected together\n");
return -EINVAL;
}
if (device_property_read_bool(dev, "icplus,select-rx-error"))
priv->sel_intr32 = IP101GR_SEL_INTR32_RXER;
else if (device_property_read_bool(dev, "icplus,select-interrupt"))
priv->sel_intr32 = IP101GR_SEL_INTR32_INTR;
else
priv->sel_intr32 = IP101GR_SEL_INTR32_KEEP;
phydev->priv = priv;
return 0;
}
static int ip101a_g_config_init(struct phy_device *phydev)
{
struct ip101a_g_phy_priv *priv = phydev->priv;
int err, c;
c = ip1xx_reset(phydev);
if (c < 0)
return c;
/* configure the RXER/INTR_32 pin of the 32-pin IP101GR if needed: */
switch (priv->sel_intr32) {
case IP101GR_SEL_INTR32_RXER:
err = phy_modify(phydev, IP101G_DIGITAL_IO_SPEC_CTRL,
IP101G_DIGITAL_IO_SPEC_CTRL_SEL_INTR32, 0);
if (err < 0)
return err;
break;
case IP101GR_SEL_INTR32_INTR:
err = phy_modify(phydev, IP101G_DIGITAL_IO_SPEC_CTRL,
IP101G_DIGITAL_IO_SPEC_CTRL_SEL_INTR32,
IP101G_DIGITAL_IO_SPEC_CTRL_SEL_INTR32);
if (err < 0)
return err;
break;
default:
/* Don't touch IP101G_DIGITAL_IO_SPEC_CTRL because it's not
* documented on IP101A and it's not clear whether this would
* cause problems.
* For the 32-pin IP101GR we simply keep the SEL_INTR32
* configuration as set by the bootloader when not configured
* to one of the special functions.
*/
break;
}
/* Enable Auto Power Saving mode */
c = phy_read(phydev, IP10XX_SPEC_CTRL_STATUS);
c |= IP101A_G_APS_ON;
return phy_write(phydev, IP10XX_SPEC_CTRL_STATUS, c);
}
static int ip101a_g_config_intr(struct phy_device *phydev)
{
u16 val;
if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
/* INTR pin used: Speed/link/duplex will cause an interrupt */
val = IP101A_G_IRQ_PIN_USED;
else
val = IP101A_G_IRQ_ALL_MASK;
return phy_write(phydev, IP101A_G_IRQ_CONF_STATUS, val);
}
static int ip101a_g_did_interrupt(struct phy_device *phydev)
{
int val = phy_read(phydev, IP101A_G_IRQ_CONF_STATUS);
if (val < 0)
return 0;
return val & (IP101A_G_IRQ_SPEED_CHANGE |
IP101A_G_IRQ_DUPLEX_CHANGE |
IP101A_G_IRQ_LINK_CHANGE);
}
static int ip101a_g_ack_interrupt(struct phy_device *phydev)
{
int err = phy_read(phydev, IP101A_G_IRQ_CONF_STATUS);
if (err < 0)
return err;
return 0;
}
static struct phy_driver icplus_driver[] = {
{
.phy_id = 0x02430d80,
.name = "ICPlus IP175C",
.phy_id_mask = 0x0ffffff0,
.features = PHY_BASIC_FEATURES,
.config_init = &ip175c_config_init,
.config_aneg = &ip175c_config_aneg,
.read_status = &ip175c_read_status,
.suspend = genphy_suspend,
.resume = genphy_resume,
}, {
.phy_id = 0x02430d90,
.name = "ICPlus IP1001",
.phy_id_mask = 0x0ffffff0,
.features = PHY_GBIT_FEATURES,
.config_init = &ip1001_config_init,
.suspend = genphy_suspend,
.resume = genphy_resume,
}, {
.phy_id = 0x02430c54,
.name = "ICPlus IP101A/G",
.phy_id_mask = 0x0ffffff0,
.features = PHY_BASIC_FEATURES,
.probe = ip101a_g_probe,
.config_intr = ip101a_g_config_intr,
.did_interrupt = ip101a_g_did_interrupt,
.ack_interrupt = ip101a_g_ack_interrupt,
.config_init = &ip101a_g_config_init,
.suspend = genphy_suspend,
.resume = genphy_resume,
} };
module_phy_driver(icplus_driver);
static struct mdio_device_id __maybe_unused icplus_tbl[] = {
{ 0x02430d80, 0x0ffffff0 },
{ 0x02430d90, 0x0ffffff0 },
{ 0x02430c54, 0x0ffffff0 },
{ }
};
MODULE_DEVICE_TABLE(mdio, icplus_tbl);
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