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linuxdebug/drivers/net/phy/dp83867.c

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null pointer error
2024-07-16 15:50:57 +02:00
// SPDX-License-Identifier: GPL-2.0
/* Driver for the Texas Instruments DP83867 PHY
*
* Copyright (C) 2015 Texas Instruments Inc.
*/
#include <linux/ethtool.h>
#include <linux/kernel.h>
#include <linux/mii.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/phy.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/bitfield.h>
#include <linux/nvmem-consumer.h>
#include <dt-bindings/net/ti-dp83867.h>
#define DP83867_PHY_ID 0x2000a231
#define DP83867_DEVADDR 0x1f
#define MII_DP83867_PHYCTRL 0x10
#define MII_DP83867_PHYSTS 0x11
#define MII_DP83867_MICR 0x12
#define MII_DP83867_ISR 0x13
#define DP83867_CFG2 0x14
#define DP83867_CFG3 0x1e
#define DP83867_CTRL 0x1f
/* Extended Registers */
#define DP83867_FLD_THR_CFG 0x002e
#define DP83867_CFG4 0x0031
#define DP83867_CFG4_SGMII_ANEG_MASK (BIT(5) | BIT(6))
#define DP83867_CFG4_SGMII_ANEG_TIMER_11MS (3 << 5)
#define DP83867_CFG4_SGMII_ANEG_TIMER_800US (2 << 5)
#define DP83867_CFG4_SGMII_ANEG_TIMER_2US (1 << 5)
#define DP83867_CFG4_SGMII_ANEG_TIMER_16MS (0 << 5)
#define DP83867_RGMIICTL 0x0032
#define DP83867_STRAP_STS1 0x006E
#define DP83867_STRAP_STS2 0x006f
#define DP83867_RGMIIDCTL 0x0086
#define DP83867_DSP_FFE_CFG 0x012c
#define DP83867_RXFCFG 0x0134
#define DP83867_RXFPMD1 0x0136
#define DP83867_RXFPMD2 0x0137
#define DP83867_RXFPMD3 0x0138
#define DP83867_RXFSOP1 0x0139
#define DP83867_RXFSOP2 0x013A
#define DP83867_RXFSOP3 0x013B
#define DP83867_IO_MUX_CFG 0x0170
#define DP83867_SGMIICTL 0x00D3
#define DP83867_10M_SGMII_CFG 0x016F
#define DP83867_10M_SGMII_RATE_ADAPT_MASK BIT(7)
#define DP83867_SW_RESET BIT(15)
#define DP83867_SW_RESTART BIT(14)
/* MICR Interrupt bits */
#define MII_DP83867_MICR_AN_ERR_INT_EN BIT(15)
#define MII_DP83867_MICR_SPEED_CHNG_INT_EN BIT(14)
#define MII_DP83867_MICR_DUP_MODE_CHNG_INT_EN BIT(13)
#define MII_DP83867_MICR_PAGE_RXD_INT_EN BIT(12)
#define MII_DP83867_MICR_AUTONEG_COMP_INT_EN BIT(11)
#define MII_DP83867_MICR_LINK_STS_CHNG_INT_EN BIT(10)
#define MII_DP83867_MICR_FALSE_CARRIER_INT_EN BIT(8)
#define MII_DP83867_MICR_SLEEP_MODE_CHNG_INT_EN BIT(4)
#define MII_DP83867_MICR_WOL_INT_EN BIT(3)
#define MII_DP83867_MICR_XGMII_ERR_INT_EN BIT(2)
#define MII_DP83867_MICR_POL_CHNG_INT_EN BIT(1)
#define MII_DP83867_MICR_JABBER_INT_EN BIT(0)
/* RGMIICTL bits */
#define DP83867_RGMII_TX_CLK_DELAY_EN BIT(1)
#define DP83867_RGMII_RX_CLK_DELAY_EN BIT(0)
/* SGMIICTL bits */
#define DP83867_SGMII_TYPE BIT(14)
/* RXFCFG bits*/
#define DP83867_WOL_MAGIC_EN BIT(0)
#define DP83867_WOL_BCAST_EN BIT(2)
#define DP83867_WOL_UCAST_EN BIT(4)
#define DP83867_WOL_SEC_EN BIT(5)
#define DP83867_WOL_ENH_MAC BIT(7)
/* STRAP_STS1 bits */
#define DP83867_STRAP_STS1_RESERVED BIT(11)
/* STRAP_STS2 bits */
#define DP83867_STRAP_STS2_CLK_SKEW_TX_MASK GENMASK(6, 4)
#define DP83867_STRAP_STS2_CLK_SKEW_TX_SHIFT 4
#define DP83867_STRAP_STS2_CLK_SKEW_RX_MASK GENMASK(2, 0)
#define DP83867_STRAP_STS2_CLK_SKEW_RX_SHIFT 0
#define DP83867_STRAP_STS2_CLK_SKEW_NONE BIT(2)
#define DP83867_STRAP_STS2_STRAP_FLD BIT(10)
/* PHY CTRL bits */
#define DP83867_PHYCR_TX_FIFO_DEPTH_SHIFT 14
#define DP83867_PHYCR_RX_FIFO_DEPTH_SHIFT 12
#define DP83867_PHYCR_FIFO_DEPTH_MAX 0x03
#define DP83867_PHYCR_TX_FIFO_DEPTH_MASK GENMASK(15, 14)
#define DP83867_PHYCR_RX_FIFO_DEPTH_MASK GENMASK(13, 12)
#define DP83867_PHYCR_RESERVED_MASK BIT(11)
#define DP83867_PHYCR_FORCE_LINK_GOOD BIT(10)
/* RGMIIDCTL bits */
#define DP83867_RGMII_TX_CLK_DELAY_MAX 0xf
#define DP83867_RGMII_TX_CLK_DELAY_SHIFT 4
#define DP83867_RGMII_TX_CLK_DELAY_INV (DP83867_RGMII_TX_CLK_DELAY_MAX + 1)
#define DP83867_RGMII_RX_CLK_DELAY_MAX 0xf
#define DP83867_RGMII_RX_CLK_DELAY_SHIFT 0
#define DP83867_RGMII_RX_CLK_DELAY_INV (DP83867_RGMII_RX_CLK_DELAY_MAX + 1)
/* IO_MUX_CFG bits */
#define DP83867_IO_MUX_CFG_IO_IMPEDANCE_MASK 0x1f
#define DP83867_IO_MUX_CFG_IO_IMPEDANCE_MAX 0x0
#define DP83867_IO_MUX_CFG_IO_IMPEDANCE_MIN 0x1f
#define DP83867_IO_MUX_CFG_CLK_O_DISABLE BIT(6)
#define DP83867_IO_MUX_CFG_CLK_O_SEL_MASK (0x1f << 8)
#define DP83867_IO_MUX_CFG_CLK_O_SEL_SHIFT 8
/* PHY STS bits */
#define DP83867_PHYSTS_1000 BIT(15)
#define DP83867_PHYSTS_100 BIT(14)
#define DP83867_PHYSTS_DUPLEX BIT(13)
#define DP83867_PHYSTS_LINK BIT(10)
/* CFG2 bits */
#define DP83867_DOWNSHIFT_EN (BIT(8) | BIT(9))
#define DP83867_DOWNSHIFT_ATTEMPT_MASK (BIT(10) | BIT(11))
#define DP83867_DOWNSHIFT_1_COUNT_VAL 0
#define DP83867_DOWNSHIFT_2_COUNT_VAL 1
#define DP83867_DOWNSHIFT_4_COUNT_VAL 2
#define DP83867_DOWNSHIFT_8_COUNT_VAL 3
#define DP83867_DOWNSHIFT_1_COUNT 1
#define DP83867_DOWNSHIFT_2_COUNT 2
#define DP83867_DOWNSHIFT_4_COUNT 4
#define DP83867_DOWNSHIFT_8_COUNT 8
#define DP83867_SGMII_AUTONEG_EN BIT(7)
/* CFG3 bits */
#define DP83867_CFG3_INT_OE BIT(7)
#define DP83867_CFG3_ROBUST_AUTO_MDIX BIT(9)
/* CFG4 bits */
#define DP83867_CFG4_PORT_MIRROR_EN BIT(0)
/* FLD_THR_CFG */
#define DP83867_FLD_THR_CFG_ENERGY_LOST_THR_MASK 0x7
enum {
DP83867_PORT_MIRROING_KEEP,
DP83867_PORT_MIRROING_EN,
DP83867_PORT_MIRROING_DIS,
};
struct dp83867_private {
u32 rx_id_delay;
u32 tx_id_delay;
u32 tx_fifo_depth;
u32 rx_fifo_depth;
int io_impedance;
int port_mirroring;
bool rxctrl_strap_quirk;
bool set_clk_output;
u32 clk_output_sel;
bool sgmii_ref_clk_en;
};
static int dp83867_ack_interrupt(struct phy_device *phydev)
{
int err = phy_read(phydev, MII_DP83867_ISR);
if (err < 0)
return err;
return 0;
}
static int dp83867_set_wol(struct phy_device *phydev,
struct ethtool_wolinfo *wol)
{
struct net_device *ndev = phydev->attached_dev;
u16 val_rxcfg, val_micr;
const u8 *mac;
val_rxcfg = phy_read_mmd(phydev, DP83867_DEVADDR, DP83867_RXFCFG);
val_micr = phy_read(phydev, MII_DP83867_MICR);
if (wol->wolopts & (WAKE_MAGIC | WAKE_MAGICSECURE | WAKE_UCAST |
WAKE_BCAST)) {
val_rxcfg |= DP83867_WOL_ENH_MAC;
val_micr |= MII_DP83867_MICR_WOL_INT_EN;
if (wol->wolopts & WAKE_MAGIC) {
mac = (const u8 *)ndev->dev_addr;
if (!is_valid_ether_addr(mac))
return -EINVAL;
phy_write_mmd(phydev, DP83867_DEVADDR, DP83867_RXFPMD1,
(mac[1] << 8 | mac[0]));
phy_write_mmd(phydev, DP83867_DEVADDR, DP83867_RXFPMD2,
(mac[3] << 8 | mac[2]));
phy_write_mmd(phydev, DP83867_DEVADDR, DP83867_RXFPMD3,
(mac[5] << 8 | mac[4]));
val_rxcfg |= DP83867_WOL_MAGIC_EN;
} else {
val_rxcfg &= ~DP83867_WOL_MAGIC_EN;
}
if (wol->wolopts & WAKE_MAGICSECURE) {
phy_write_mmd(phydev, DP83867_DEVADDR, DP83867_RXFSOP1,
(wol->sopass[1] << 8) | wol->sopass[0]);
phy_write_mmd(phydev, DP83867_DEVADDR, DP83867_RXFSOP2,
(wol->sopass[3] << 8) | wol->sopass[2]);
phy_write_mmd(phydev, DP83867_DEVADDR, DP83867_RXFSOP3,
(wol->sopass[5] << 8) | wol->sopass[4]);
val_rxcfg |= DP83867_WOL_SEC_EN;
} else {
val_rxcfg &= ~DP83867_WOL_SEC_EN;
}
if (wol->wolopts & WAKE_UCAST)
val_rxcfg |= DP83867_WOL_UCAST_EN;
else
val_rxcfg &= ~DP83867_WOL_UCAST_EN;
if (wol->wolopts & WAKE_BCAST)
val_rxcfg |= DP83867_WOL_BCAST_EN;
else
val_rxcfg &= ~DP83867_WOL_BCAST_EN;
} else {
val_rxcfg &= ~DP83867_WOL_ENH_MAC;
val_micr &= ~MII_DP83867_MICR_WOL_INT_EN;
}
phy_write_mmd(phydev, DP83867_DEVADDR, DP83867_RXFCFG, val_rxcfg);
phy_write(phydev, MII_DP83867_MICR, val_micr);
return 0;
}
static void dp83867_get_wol(struct phy_device *phydev,
struct ethtool_wolinfo *wol)
{
u16 value, sopass_val;
wol->supported = (WAKE_UCAST | WAKE_BCAST | WAKE_MAGIC |
WAKE_MAGICSECURE);
wol->wolopts = 0;
value = phy_read_mmd(phydev, DP83867_DEVADDR, DP83867_RXFCFG);
if (value & DP83867_WOL_UCAST_EN)
wol->wolopts |= WAKE_UCAST;
if (value & DP83867_WOL_BCAST_EN)
wol->wolopts |= WAKE_BCAST;
if (value & DP83867_WOL_MAGIC_EN)
wol->wolopts |= WAKE_MAGIC;
if (value & DP83867_WOL_SEC_EN) {
sopass_val = phy_read_mmd(phydev, DP83867_DEVADDR,
DP83867_RXFSOP1);
wol->sopass[0] = (sopass_val & 0xff);
wol->sopass[1] = (sopass_val >> 8);
sopass_val = phy_read_mmd(phydev, DP83867_DEVADDR,
DP83867_RXFSOP2);
wol->sopass[2] = (sopass_val & 0xff);
wol->sopass[3] = (sopass_val >> 8);
sopass_val = phy_read_mmd(phydev, DP83867_DEVADDR,
DP83867_RXFSOP3);
wol->sopass[4] = (sopass_val & 0xff);
wol->sopass[5] = (sopass_val >> 8);
wol->wolopts |= WAKE_MAGICSECURE;
}
if (!(value & DP83867_WOL_ENH_MAC))
wol->wolopts = 0;
}
static int dp83867_config_intr(struct phy_device *phydev)
{
int micr_status, err;
if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
err = dp83867_ack_interrupt(phydev);
if (err)
return err;
micr_status = phy_read(phydev, MII_DP83867_MICR);
if (micr_status < 0)
return micr_status;
micr_status |=
(MII_DP83867_MICR_AN_ERR_INT_EN |
MII_DP83867_MICR_SPEED_CHNG_INT_EN |
MII_DP83867_MICR_AUTONEG_COMP_INT_EN |
MII_DP83867_MICR_LINK_STS_CHNG_INT_EN |
MII_DP83867_MICR_DUP_MODE_CHNG_INT_EN |
MII_DP83867_MICR_SLEEP_MODE_CHNG_INT_EN);
err = phy_write(phydev, MII_DP83867_MICR, micr_status);
} else {
micr_status = 0x0;
err = phy_write(phydev, MII_DP83867_MICR, micr_status);
if (err)
return err;
err = dp83867_ack_interrupt(phydev);
}
return err;
}
static irqreturn_t dp83867_handle_interrupt(struct phy_device *phydev)
{
int irq_status, irq_enabled;
irq_status = phy_read(phydev, MII_DP83867_ISR);
if (irq_status < 0) {
phy_error(phydev);
return IRQ_NONE;
}
irq_enabled = phy_read(phydev, MII_DP83867_MICR);
if (irq_enabled < 0) {
phy_error(phydev);
return IRQ_NONE;
}
if (!(irq_status & irq_enabled))
return IRQ_NONE;
phy_trigger_machine(phydev);
return IRQ_HANDLED;
}
static int dp83867_read_status(struct phy_device *phydev)
{
int status = phy_read(phydev, MII_DP83867_PHYSTS);
int ret;
ret = genphy_read_status(phydev);
if (ret)
return ret;
if (status < 0)
return status;
if (status & DP83867_PHYSTS_DUPLEX)
phydev->duplex = DUPLEX_FULL;
else
phydev->duplex = DUPLEX_HALF;
if (status & DP83867_PHYSTS_1000)
phydev->speed = SPEED_1000;
else if (status & DP83867_PHYSTS_100)
phydev->speed = SPEED_100;
else
phydev->speed = SPEED_10;
return 0;
}
static int dp83867_get_downshift(struct phy_device *phydev, u8 *data)
{
int val, cnt, enable, count;
val = phy_read(phydev, DP83867_CFG2);
if (val < 0)
return val;
enable = FIELD_GET(DP83867_DOWNSHIFT_EN, val);
cnt = FIELD_GET(DP83867_DOWNSHIFT_ATTEMPT_MASK, val);
switch (cnt) {
case DP83867_DOWNSHIFT_1_COUNT_VAL:
count = DP83867_DOWNSHIFT_1_COUNT;
break;
case DP83867_DOWNSHIFT_2_COUNT_VAL:
count = DP83867_DOWNSHIFT_2_COUNT;
break;
case DP83867_DOWNSHIFT_4_COUNT_VAL:
count = DP83867_DOWNSHIFT_4_COUNT;
break;
case DP83867_DOWNSHIFT_8_COUNT_VAL:
count = DP83867_DOWNSHIFT_8_COUNT;
break;
default:
return -EINVAL;
}
*data = enable ? count : DOWNSHIFT_DEV_DISABLE;
return 0;
}
static int dp83867_set_downshift(struct phy_device *phydev, u8 cnt)
{
int val, count;
if (cnt > DP83867_DOWNSHIFT_8_COUNT)
return -E2BIG;
if (!cnt)
return phy_clear_bits(phydev, DP83867_CFG2,
DP83867_DOWNSHIFT_EN);
switch (cnt) {
case DP83867_DOWNSHIFT_1_COUNT:
count = DP83867_DOWNSHIFT_1_COUNT_VAL;
break;
case DP83867_DOWNSHIFT_2_COUNT:
count = DP83867_DOWNSHIFT_2_COUNT_VAL;
break;
case DP83867_DOWNSHIFT_4_COUNT:
count = DP83867_DOWNSHIFT_4_COUNT_VAL;
break;
case DP83867_DOWNSHIFT_8_COUNT:
count = DP83867_DOWNSHIFT_8_COUNT_VAL;
break;
default:
phydev_err(phydev,
"Downshift count must be 1, 2, 4 or 8\n");
return -EINVAL;
}
val = DP83867_DOWNSHIFT_EN;
val |= FIELD_PREP(DP83867_DOWNSHIFT_ATTEMPT_MASK, count);
return phy_modify(phydev, DP83867_CFG2,
DP83867_DOWNSHIFT_EN | DP83867_DOWNSHIFT_ATTEMPT_MASK,
val);
}
static int dp83867_get_tunable(struct phy_device *phydev,
struct ethtool_tunable *tuna, void *data)
{
switch (tuna->id) {
case ETHTOOL_PHY_DOWNSHIFT:
return dp83867_get_downshift(phydev, data);
default:
return -EOPNOTSUPP;
}
}
static int dp83867_set_tunable(struct phy_device *phydev,
struct ethtool_tunable *tuna, const void *data)
{
switch (tuna->id) {
case ETHTOOL_PHY_DOWNSHIFT:
return dp83867_set_downshift(phydev, *(const u8 *)data);
default:
return -EOPNOTSUPP;
}
}
static int dp83867_config_port_mirroring(struct phy_device *phydev)
{
struct dp83867_private *dp83867 =
(struct dp83867_private *)phydev->priv;
if (dp83867->port_mirroring == DP83867_PORT_MIRROING_EN)
phy_set_bits_mmd(phydev, DP83867_DEVADDR, DP83867_CFG4,
DP83867_CFG4_PORT_MIRROR_EN);
else
phy_clear_bits_mmd(phydev, DP83867_DEVADDR, DP83867_CFG4,
DP83867_CFG4_PORT_MIRROR_EN);
return 0;
}
static int dp83867_verify_rgmii_cfg(struct phy_device *phydev)
{
struct dp83867_private *dp83867 = phydev->priv;
/* Existing behavior was to use default pin strapping delay in rgmii
* mode, but rgmii should have meant no delay. Warn existing users.
*/
if (phydev->interface == PHY_INTERFACE_MODE_RGMII) {
const u16 val = phy_read_mmd(phydev, DP83867_DEVADDR,
DP83867_STRAP_STS2);
const u16 txskew = (val & DP83867_STRAP_STS2_CLK_SKEW_TX_MASK) >>
DP83867_STRAP_STS2_CLK_SKEW_TX_SHIFT;
const u16 rxskew = (val & DP83867_STRAP_STS2_CLK_SKEW_RX_MASK) >>
DP83867_STRAP_STS2_CLK_SKEW_RX_SHIFT;
if (txskew != DP83867_STRAP_STS2_CLK_SKEW_NONE ||
rxskew != DP83867_STRAP_STS2_CLK_SKEW_NONE)
phydev_warn(phydev,
"PHY has delays via pin strapping, but phy-mode = 'rgmii'\n"
"Should be 'rgmii-id' to use internal delays txskew:%x rxskew:%x\n",
txskew, rxskew);
}
/* RX delay *must* be specified if internal delay of RX is used. */
if ((phydev->interface == PHY_INTERFACE_MODE_RGMII_ID ||
phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID) &&
dp83867->rx_id_delay == DP83867_RGMII_RX_CLK_DELAY_INV) {
phydev_err(phydev, "ti,rx-internal-delay must be specified\n");
return -EINVAL;
}
/* TX delay *must* be specified if internal delay of TX is used. */
if ((phydev->interface == PHY_INTERFACE_MODE_RGMII_ID ||
phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID) &&
dp83867->tx_id_delay == DP83867_RGMII_TX_CLK_DELAY_INV) {
phydev_err(phydev, "ti,tx-internal-delay must be specified\n");
return -EINVAL;
}
return 0;
}
#if IS_ENABLED(CONFIG_OF_MDIO)
static int dp83867_of_init_io_impedance(struct phy_device *phydev)
{
struct dp83867_private *dp83867 = phydev->priv;
struct device *dev = &phydev->mdio.dev;
struct device_node *of_node = dev->of_node;
struct nvmem_cell *cell;
u8 *buf, val;
int ret;
cell = of_nvmem_cell_get(of_node, "io_impedance_ctrl");
if (IS_ERR(cell)) {
ret = PTR_ERR(cell);
if (ret != -ENOENT && ret != -EOPNOTSUPP)
return phydev_err_probe(phydev, ret,
"failed to get nvmem cell io_impedance_ctrl\n");
/* If no nvmem cell, check for the boolean properties. */
if (of_property_read_bool(of_node, "ti,max-output-impedance"))
dp83867->io_impedance = DP83867_IO_MUX_CFG_IO_IMPEDANCE_MAX;
else if (of_property_read_bool(of_node, "ti,min-output-impedance"))
dp83867->io_impedance = DP83867_IO_MUX_CFG_IO_IMPEDANCE_MIN;
else
dp83867->io_impedance = -1; /* leave at default */
return 0;
}
buf = nvmem_cell_read(cell, NULL);
nvmem_cell_put(cell);
if (IS_ERR(buf))
return PTR_ERR(buf);
val = *buf;
kfree(buf);
if ((val & DP83867_IO_MUX_CFG_IO_IMPEDANCE_MASK) != val) {
phydev_err(phydev, "nvmem cell 'io_impedance_ctrl' contents out of range\n");
return -ERANGE;
}
dp83867->io_impedance = val;
return 0;
}
static int dp83867_of_init(struct phy_device *phydev)
{
struct dp83867_private *dp83867 = phydev->priv;
struct device *dev = &phydev->mdio.dev;
struct device_node *of_node = dev->of_node;
int ret;
if (!of_node)
return -ENODEV;
/* Optional configuration */
ret = of_property_read_u32(of_node, "ti,clk-output-sel",
&dp83867->clk_output_sel);
/* If not set, keep default */
if (!ret) {
dp83867->set_clk_output = true;
/* Valid values are 0 to DP83867_CLK_O_SEL_REF_CLK or
* DP83867_CLK_O_SEL_OFF.
*/
if (dp83867->clk_output_sel > DP83867_CLK_O_SEL_REF_CLK &&
dp83867->clk_output_sel != DP83867_CLK_O_SEL_OFF) {
phydev_err(phydev, "ti,clk-output-sel value %u out of range\n",
dp83867->clk_output_sel);
return -EINVAL;
}
}
ret = dp83867_of_init_io_impedance(phydev);
if (ret)
return ret;
dp83867->rxctrl_strap_quirk = of_property_read_bool(of_node,
"ti,dp83867-rxctrl-strap-quirk");
dp83867->sgmii_ref_clk_en = of_property_read_bool(of_node,
"ti,sgmii-ref-clock-output-enable");
dp83867->rx_id_delay = DP83867_RGMII_RX_CLK_DELAY_INV;
ret = of_property_read_u32(of_node, "ti,rx-internal-delay",
&dp83867->rx_id_delay);
if (!ret && dp83867->rx_id_delay > DP83867_RGMII_RX_CLK_DELAY_MAX) {
phydev_err(phydev,
"ti,rx-internal-delay value of %u out of range\n",
dp83867->rx_id_delay);
return -EINVAL;
}
dp83867->tx_id_delay = DP83867_RGMII_TX_CLK_DELAY_INV;
ret = of_property_read_u32(of_node, "ti,tx-internal-delay",
&dp83867->tx_id_delay);
if (!ret && dp83867->tx_id_delay > DP83867_RGMII_TX_CLK_DELAY_MAX) {
phydev_err(phydev,
"ti,tx-internal-delay value of %u out of range\n",
dp83867->tx_id_delay);
return -EINVAL;
}
if (of_property_read_bool(of_node, "enet-phy-lane-swap"))
dp83867->port_mirroring = DP83867_PORT_MIRROING_EN;
if (of_property_read_bool(of_node, "enet-phy-lane-no-swap"))
dp83867->port_mirroring = DP83867_PORT_MIRROING_DIS;
ret = of_property_read_u32(of_node, "ti,fifo-depth",
&dp83867->tx_fifo_depth);
if (ret) {
ret = of_property_read_u32(of_node, "tx-fifo-depth",
&dp83867->tx_fifo_depth);
if (ret)
dp83867->tx_fifo_depth =
DP83867_PHYCR_FIFO_DEPTH_4_B_NIB;
}
if (dp83867->tx_fifo_depth > DP83867_PHYCR_FIFO_DEPTH_MAX) {
phydev_err(phydev, "tx-fifo-depth value %u out of range\n",
dp83867->tx_fifo_depth);
return -EINVAL;
}
ret = of_property_read_u32(of_node, "rx-fifo-depth",
&dp83867->rx_fifo_depth);
if (ret)
dp83867->rx_fifo_depth = DP83867_PHYCR_FIFO_DEPTH_4_B_NIB;
if (dp83867->rx_fifo_depth > DP83867_PHYCR_FIFO_DEPTH_MAX) {
phydev_err(phydev, "rx-fifo-depth value %u out of range\n",
dp83867->rx_fifo_depth);
return -EINVAL;
}
return 0;
}
#else
static int dp83867_of_init(struct phy_device *phydev)
{
struct dp83867_private *dp83867 = phydev->priv;
u16 delay;
/* For non-OF device, the RX and TX ID values are either strapped
* or take from default value. So, we init RX & TX ID values here
* so that the RGMIIDCTL is configured correctly later in
* dp83867_config_init();
*/
delay = phy_read_mmd(phydev, DP83867_DEVADDR, DP83867_RGMIIDCTL);
dp83867->rx_id_delay = delay & DP83867_RGMII_RX_CLK_DELAY_MAX;
dp83867->tx_id_delay = (delay >> DP83867_RGMII_TX_CLK_DELAY_SHIFT) &
DP83867_RGMII_TX_CLK_DELAY_MAX;
/* Per datasheet, IO impedance is default to 50-ohm, so we set the
* same here or else the default '0' means highest IO impedance
* which is wrong.
*/
dp83867->io_impedance = DP83867_IO_MUX_CFG_IO_IMPEDANCE_MIN / 2;
/* For non-OF device, the RX and TX FIFO depths are taken from
* default value. So, we init RX & TX FIFO depths here
* so that it is configured correctly later in dp83867_config_init();
*/
dp83867->tx_fifo_depth = DP83867_PHYCR_FIFO_DEPTH_4_B_NIB;
dp83867->rx_fifo_depth = DP83867_PHYCR_FIFO_DEPTH_4_B_NIB;
return 0;
}
#endif /* CONFIG_OF_MDIO */
static int dp83867_probe(struct phy_device *phydev)
{
struct dp83867_private *dp83867;
dp83867 = devm_kzalloc(&phydev->mdio.dev, sizeof(*dp83867),
GFP_KERNEL);
if (!dp83867)
return -ENOMEM;
phydev->priv = dp83867;
return dp83867_of_init(phydev);
}
static int dp83867_config_init(struct phy_device *phydev)
{
struct dp83867_private *dp83867 = phydev->priv;
int ret, val, bs;
u16 delay;
/* Force speed optimization for the PHY even if it strapped */
ret = phy_modify(phydev, DP83867_CFG2, DP83867_DOWNSHIFT_EN,
DP83867_DOWNSHIFT_EN);
if (ret)
return ret;
ret = dp83867_verify_rgmii_cfg(phydev);
if (ret)
return ret;
/* RX_DV/RX_CTRL strapped in mode 1 or mode 2 workaround */
if (dp83867->rxctrl_strap_quirk)
phy_clear_bits_mmd(phydev, DP83867_DEVADDR, DP83867_CFG4,
BIT(7));
bs = phy_read_mmd(phydev, DP83867_DEVADDR, DP83867_STRAP_STS2);
if (bs & DP83867_STRAP_STS2_STRAP_FLD) {
/* When using strap to enable FLD, the ENERGY_LOST_FLD_THR will
* be set to 0x2. This may causes the PHY link to be unstable -
* the default value 0x1 need to be restored.
*/
ret = phy_modify_mmd(phydev, DP83867_DEVADDR,
DP83867_FLD_THR_CFG,
DP83867_FLD_THR_CFG_ENERGY_LOST_THR_MASK,
0x1);
if (ret)
return ret;
}
if (phy_interface_is_rgmii(phydev) ||
phydev->interface == PHY_INTERFACE_MODE_SGMII) {
val = phy_read(phydev, MII_DP83867_PHYCTRL);
if (val < 0)
return val;
val &= ~DP83867_PHYCR_TX_FIFO_DEPTH_MASK;
val |= (dp83867->tx_fifo_depth <<
DP83867_PHYCR_TX_FIFO_DEPTH_SHIFT);
if (phydev->interface == PHY_INTERFACE_MODE_SGMII) {
val &= ~DP83867_PHYCR_RX_FIFO_DEPTH_MASK;
val |= (dp83867->rx_fifo_depth <<
DP83867_PHYCR_RX_FIFO_DEPTH_SHIFT);
}
ret = phy_write(phydev, MII_DP83867_PHYCTRL, val);
if (ret)
return ret;
}
if (phy_interface_is_rgmii(phydev)) {
val = phy_read(phydev, MII_DP83867_PHYCTRL);
if (val < 0)
return val;
/* The code below checks if "port mirroring" N/A MODE4 has been
* enabled during power on bootstrap.
*
* Such N/A mode enabled by mistake can put PHY IC in some
* internal testing mode and disable RGMII transmission.
*
* In this particular case one needs to check STRAP_STS1
* register's bit 11 (marked as RESERVED).
*/
bs = phy_read_mmd(phydev, DP83867_DEVADDR, DP83867_STRAP_STS1);
if (bs & DP83867_STRAP_STS1_RESERVED)
val &= ~DP83867_PHYCR_RESERVED_MASK;
ret = phy_write(phydev, MII_DP83867_PHYCTRL, val);
if (ret)
return ret;
/* If rgmii mode with no internal delay is selected, we do NOT use
* aligned mode as one might expect. Instead we use the PHY's default
* based on pin strapping. And the "mode 0" default is to *use*
* internal delay with a value of 7 (2.00 ns).
*
* Set up RGMII delays
*/
val = phy_read_mmd(phydev, DP83867_DEVADDR, DP83867_RGMIICTL);
val &= ~(DP83867_RGMII_TX_CLK_DELAY_EN | DP83867_RGMII_RX_CLK_DELAY_EN);
if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID)
val |= (DP83867_RGMII_TX_CLK_DELAY_EN | DP83867_RGMII_RX_CLK_DELAY_EN);
if (phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID)
val |= DP83867_RGMII_TX_CLK_DELAY_EN;
if (phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID)
val |= DP83867_RGMII_RX_CLK_DELAY_EN;
phy_write_mmd(phydev, DP83867_DEVADDR, DP83867_RGMIICTL, val);
delay = 0;
if (dp83867->rx_id_delay != DP83867_RGMII_RX_CLK_DELAY_INV)
delay |= dp83867->rx_id_delay;
if (dp83867->tx_id_delay != DP83867_RGMII_TX_CLK_DELAY_INV)
delay |= dp83867->tx_id_delay <<
DP83867_RGMII_TX_CLK_DELAY_SHIFT;
phy_write_mmd(phydev, DP83867_DEVADDR, DP83867_RGMIIDCTL,
delay);
}
/* If specified, set io impedance */
if (dp83867->io_impedance >= 0)
phy_modify_mmd(phydev, DP83867_DEVADDR, DP83867_IO_MUX_CFG,
DP83867_IO_MUX_CFG_IO_IMPEDANCE_MASK,
dp83867->io_impedance);
if (phydev->interface == PHY_INTERFACE_MODE_SGMII) {
/* For support SPEED_10 in SGMII mode
* DP83867_10M_SGMII_RATE_ADAPT bit
* has to be cleared by software. That
* does not affect SPEED_100 and
* SPEED_1000.
*/
ret = phy_modify_mmd(phydev, DP83867_DEVADDR,
DP83867_10M_SGMII_CFG,
DP83867_10M_SGMII_RATE_ADAPT_MASK,
0);
if (ret)
return ret;
/* After reset SGMII Autoneg timer is set to 2us (bits 6 and 5
* are 01). That is not enough to finalize autoneg on some
* devices. Increase this timer duration to maximum 16ms.
*/
ret = phy_modify_mmd(phydev, DP83867_DEVADDR,
DP83867_CFG4,
DP83867_CFG4_SGMII_ANEG_MASK,
DP83867_CFG4_SGMII_ANEG_TIMER_16MS);
if (ret)
return ret;
val = phy_read_mmd(phydev, DP83867_DEVADDR, DP83867_SGMIICTL);
/* SGMII type is set to 4-wire mode by default.
* If we place appropriate property in dts (see above)
* switch on 6-wire mode.
*/
if (dp83867->sgmii_ref_clk_en)
val |= DP83867_SGMII_TYPE;
else
val &= ~DP83867_SGMII_TYPE;
phy_write_mmd(phydev, DP83867_DEVADDR, DP83867_SGMIICTL, val);
/* This is a SW workaround for link instability if RX_CTRL is
* not strapped to mode 3 or 4 in HW. This is required for SGMII
* in addition to clearing bit 7, handled above.
*/
if (dp83867->rxctrl_strap_quirk)
phy_set_bits_mmd(phydev, DP83867_DEVADDR, DP83867_CFG4,
BIT(8));
}
val = phy_read(phydev, DP83867_CFG3);
/* Enable Interrupt output INT_OE in CFG3 register */
if (phy_interrupt_is_valid(phydev))
val |= DP83867_CFG3_INT_OE;
val |= DP83867_CFG3_ROBUST_AUTO_MDIX;
phy_write(phydev, DP83867_CFG3, val);
if (dp83867->port_mirroring != DP83867_PORT_MIRROING_KEEP)
dp83867_config_port_mirroring(phydev);
/* Clock output selection if muxing property is set */
if (dp83867->set_clk_output) {
u16 mask = DP83867_IO_MUX_CFG_CLK_O_DISABLE;
if (dp83867->clk_output_sel == DP83867_CLK_O_SEL_OFF) {
val = DP83867_IO_MUX_CFG_CLK_O_DISABLE;
} else {
mask |= DP83867_IO_MUX_CFG_CLK_O_SEL_MASK;
val = dp83867->clk_output_sel <<
DP83867_IO_MUX_CFG_CLK_O_SEL_SHIFT;
}
phy_modify_mmd(phydev, DP83867_DEVADDR, DP83867_IO_MUX_CFG,
mask, val);
}
return 0;
}
static int dp83867_phy_reset(struct phy_device *phydev)
{
int err;
err = phy_write(phydev, DP83867_CTRL, DP83867_SW_RESET);
if (err < 0)
return err;
usleep_range(10, 20);
err = phy_modify(phydev, MII_DP83867_PHYCTRL,
DP83867_PHYCR_FORCE_LINK_GOOD, 0);
if (err < 0)
return err;
/* Configure the DSP Feedforward Equalizer Configuration register to
* improve short cable (< 1 meter) performance. This will not affect
* long cable performance.
*/
err = phy_write_mmd(phydev, DP83867_DEVADDR, DP83867_DSP_FFE_CFG,
0x0e81);
if (err < 0)
return err;
err = phy_write(phydev, DP83867_CTRL, DP83867_SW_RESTART);
if (err < 0)
return err;
usleep_range(10, 20);
return 0;
}
static void dp83867_link_change_notify(struct phy_device *phydev)
{
/* There is a limitation in DP83867 PHY device where SGMII AN is
* only triggered once after the device is booted up. Even after the
* PHY TPI is down and up again, SGMII AN is not triggered and
* hence no new in-band message from PHY to MAC side SGMII.
* This could cause an issue during power up, when PHY is up prior
* to MAC. At this condition, once MAC side SGMII is up, MAC side
* SGMII wouldn`t receive new in-band message from TI PHY with
* correct link status, speed and duplex info.
* Thus, implemented a SW solution here to retrigger SGMII Auto-Neg
* whenever there is a link change.
*/
if (phydev->interface == PHY_INTERFACE_MODE_SGMII) {
int val = 0;
val = phy_clear_bits(phydev, DP83867_CFG2,
DP83867_SGMII_AUTONEG_EN);
if (val < 0)
return;
phy_set_bits(phydev, DP83867_CFG2,
DP83867_SGMII_AUTONEG_EN);
}
}
static struct phy_driver dp83867_driver[] = {
{
.phy_id = DP83867_PHY_ID,
.phy_id_mask = 0xfffffff0,
.name = "TI DP83867",
/* PHY_GBIT_FEATURES */
.probe = dp83867_probe,
.config_init = dp83867_config_init,
.soft_reset = dp83867_phy_reset,
.read_status = dp83867_read_status,
.get_tunable = dp83867_get_tunable,
.set_tunable = dp83867_set_tunable,
.get_wol = dp83867_get_wol,
.set_wol = dp83867_set_wol,
/* IRQ related */
.config_intr = dp83867_config_intr,
.handle_interrupt = dp83867_handle_interrupt,
.suspend = genphy_suspend,
.resume = genphy_resume,
.link_change_notify = dp83867_link_change_notify,
},
};
module_phy_driver(dp83867_driver);
static struct mdio_device_id __maybe_unused dp83867_tbl[] = {
{ DP83867_PHY_ID, 0xfffffff0 },
{ }
};
MODULE_DEVICE_TABLE(mdio, dp83867_tbl);
MODULE_DESCRIPTION("Texas Instruments DP83867 PHY driver");
MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com");
MODULE_LICENSE("GPL v2");