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// SPDX-License-Identifier: GPL-2.0
/*
* Driver for the Texas Instruments DP83848 PHY
*
* Copyright (C) 2015-2016 Texas Instruments Incorporated - http://www.ti.com/
*/
#include <linux/module.h>
#include <linux/phy.h>
#define TI_DP83848C_PHY_ID 0x20005ca0
#define TI_DP83620_PHY_ID 0x20005ce0
#define NS_DP83848C_PHY_ID 0x20005c90
#define TLK10X_PHY_ID 0x2000a210
/* Registers */
#define DP83848_MICR 0x11 /* MII Interrupt Control Register */
#define DP83848_MISR 0x12 /* MII Interrupt Status Register */
/* MICR Register Fields */
#define DP83848_MICR_INT_OE BIT(0) /* Interrupt Output Enable */
#define DP83848_MICR_INTEN BIT(1) /* Interrupt Enable */
/* MISR Register Fields */
#define DP83848_MISR_RHF_INT_EN BIT(0) /* Receive Error Counter */
#define DP83848_MISR_FHF_INT_EN BIT(1) /* False Carrier Counter */
#define DP83848_MISR_ANC_INT_EN BIT(2) /* Auto-negotiation complete */
#define DP83848_MISR_DUP_INT_EN BIT(3) /* Duplex Status */
#define DP83848_MISR_SPD_INT_EN BIT(4) /* Speed status */
#define DP83848_MISR_LINK_INT_EN BIT(5) /* Link status */
#define DP83848_MISR_ED_INT_EN BIT(6) /* Energy detect */
#define DP83848_MISR_LQM_INT_EN BIT(7) /* Link Quality Monitor */
#define DP83848_INT_EN_MASK \
(DP83848_MISR_ANC_INT_EN | \
DP83848_MISR_DUP_INT_EN | \
DP83848_MISR_SPD_INT_EN | \
DP83848_MISR_LINK_INT_EN)
#define DP83848_MISR_RHF_INT BIT(8)
#define DP83848_MISR_FHF_INT BIT(9)
#define DP83848_MISR_ANC_INT BIT(10)
#define DP83848_MISR_DUP_INT BIT(11)
#define DP83848_MISR_SPD_INT BIT(12)
#define DP83848_MISR_LINK_INT BIT(13)
#define DP83848_MISR_ED_INT BIT(14)
#define DP83848_INT_MASK \
(DP83848_MISR_ANC_INT | \
DP83848_MISR_DUP_INT | \
DP83848_MISR_SPD_INT | \
DP83848_MISR_LINK_INT)
static int dp83848_ack_interrupt(struct phy_device *phydev)
{
int err = phy_read(phydev, DP83848_MISR);
return err < 0 ? err : 0;
}
static int dp83848_config_intr(struct phy_device *phydev)
{
int control, ret;
control = phy_read(phydev, DP83848_MICR);
if (control < 0)
return control;
if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
ret = dp83848_ack_interrupt(phydev);
if (ret)
return ret;
control |= DP83848_MICR_INT_OE;
control |= DP83848_MICR_INTEN;
ret = phy_write(phydev, DP83848_MISR, DP83848_INT_EN_MASK);
if (ret < 0)
return ret;
ret = phy_write(phydev, DP83848_MICR, control);
} else {
control &= ~DP83848_MICR_INTEN;
ret = phy_write(phydev, DP83848_MICR, control);
if (ret)
return ret;
ret = dp83848_ack_interrupt(phydev);
}
return ret;
}
static irqreturn_t dp83848_handle_interrupt(struct phy_device *phydev)
{
int irq_status;
irq_status = phy_read(phydev, DP83848_MISR);
if (irq_status < 0) {
phy_error(phydev);
return IRQ_NONE;
}
if (!(irq_status & DP83848_INT_MASK))
return IRQ_NONE;
phy_trigger_machine(phydev);
return IRQ_HANDLED;
}
static int dp83848_config_init(struct phy_device *phydev)
{
int val;
/* DP83620 always reports Auto Negotiation Ability on BMSR. Instead,
* we check initial value of BMCR Auto negotiation enable bit
*/
val = phy_read(phydev, MII_BMCR);
if (!(val & BMCR_ANENABLE))
phydev->autoneg = AUTONEG_DISABLE;
return 0;
}
static struct mdio_device_id __maybe_unused dp83848_tbl[] = {
{ TI_DP83848C_PHY_ID, 0xfffffff0 },
{ NS_DP83848C_PHY_ID, 0xfffffff0 },
{ TI_DP83620_PHY_ID, 0xfffffff0 },
{ TLK10X_PHY_ID, 0xfffffff0 },
{ }
};
MODULE_DEVICE_TABLE(mdio, dp83848_tbl);
#define DP83848_PHY_DRIVER(_id, _name, _config_init) \
{ \
.phy_id = _id, \
.phy_id_mask = 0xfffffff0, \
.name = _name, \
/* PHY_BASIC_FEATURES */ \
\
.soft_reset = genphy_soft_reset, \
.config_init = _config_init, \
.suspend = genphy_suspend, \
.resume = genphy_resume, \
\
/* IRQ related */ \
.config_intr = dp83848_config_intr, \
.handle_interrupt = dp83848_handle_interrupt, \
}
static struct phy_driver dp83848_driver[] = {
DP83848_PHY_DRIVER(TI_DP83848C_PHY_ID, "TI DP83848C 10/100 Mbps PHY",
NULL),
DP83848_PHY_DRIVER(NS_DP83848C_PHY_ID, "NS DP83848C 10/100 Mbps PHY",
NULL),
DP83848_PHY_DRIVER(TI_DP83620_PHY_ID, "TI DP83620 10/100 Mbps PHY",
dp83848_config_init),
DP83848_PHY_DRIVER(TLK10X_PHY_ID, "TI TLK10X 10/100 Mbps PHY",
NULL),
};
module_phy_driver(dp83848_driver);
MODULE_DESCRIPTION("Texas Instruments DP83848 PHY driver");
MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
MODULE_LICENSE("GPL v2");
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