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linux/drivers/net/phy/dp83822.c
Andre Kalb 422ae7d9c7 net: phy: dp83822: Fix null pointer access on DP83825/DP83826 devices 
The probe() function is only used for the DP83822 PHY, leaving the
private data pointer uninitialized for the smaller DP83825/26 models.
While all uses of the private data structure are hidden in 82822 specific
callbacks, configuring the interrupt is shared across all models.
This causes a NULL pointer dereference on the smaller PHYs as it accesses
the private data unchecked. Verifying the pointer avoids that.

Fixes: 5dc39fd5ef ("net: phy: DP83822: Add ability to advertise Fiber connection")
Signed-off-by: Andre Kalb <andre.kalb@sma.de>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Link: https://lore.kernel.org/r/Y9FzniUhUtbaGKU7@pc6682
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2023-01-28 00:23:58 -08:00

654 lines
17 KiB
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// SPDX-License-Identifier: GPL-2.0
/* Driver for the Texas Instruments DP83822, DP83825 and DP83826 PHYs.
*
* Copyright (C) 2017 Texas Instruments Inc.
*/
#include <linux/ethtool.h>
#include <linux/etherdevice.h>
#include <linux/kernel.h>
#include <linux/mii.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/phy.h>
#include <linux/netdevice.h>
#define DP83822_PHY_ID 0x2000a240
#define DP83825S_PHY_ID 0x2000a140
#define DP83825I_PHY_ID 0x2000a150
#define DP83825CM_PHY_ID 0x2000a160
#define DP83825CS_PHY_ID 0x2000a170
#define DP83826C_PHY_ID 0x2000a130
#define DP83826NC_PHY_ID 0x2000a110
#define DP83822_DEVADDR 0x1f
#define MII_DP83822_CTRL_2 0x0a
#define MII_DP83822_PHYSTS 0x10
#define MII_DP83822_PHYSCR 0x11
#define MII_DP83822_MISR1 0x12
#define MII_DP83822_MISR2 0x13
#define MII_DP83822_FCSCR 0x14
#define MII_DP83822_RCSR 0x17
#define MII_DP83822_RESET_CTRL 0x1f
#define MII_DP83822_GENCFG 0x465
#define MII_DP83822_SOR1 0x467
/* GENCFG */
#define DP83822_SIG_DET_LOW BIT(0)
/* Control Register 2 bits */
#define DP83822_FX_ENABLE BIT(14)
#define DP83822_HW_RESET BIT(15)
#define DP83822_SW_RESET BIT(14)
/* PHY STS bits */
#define DP83822_PHYSTS_DUPLEX BIT(2)
#define DP83822_PHYSTS_10 BIT(1)
#define DP83822_PHYSTS_LINK BIT(0)
/* PHYSCR Register Fields */
#define DP83822_PHYSCR_INT_OE BIT(0) /* Interrupt Output Enable */
#define DP83822_PHYSCR_INTEN BIT(1) /* Interrupt Enable */
/* MISR1 bits */
#define DP83822_RX_ERR_HF_INT_EN BIT(0)
#define DP83822_FALSE_CARRIER_HF_INT_EN BIT(1)
#define DP83822_ANEG_COMPLETE_INT_EN BIT(2)
#define DP83822_DUP_MODE_CHANGE_INT_EN BIT(3)
#define DP83822_SPEED_CHANGED_INT_EN BIT(4)
#define DP83822_LINK_STAT_INT_EN BIT(5)
#define DP83822_ENERGY_DET_INT_EN BIT(6)
#define DP83822_LINK_QUAL_INT_EN BIT(7)
/* MISR2 bits */
#define DP83822_JABBER_DET_INT_EN BIT(0)
#define DP83822_WOL_PKT_INT_EN BIT(1)
#define DP83822_SLEEP_MODE_INT_EN BIT(2)
#define DP83822_MDI_XOVER_INT_EN BIT(3)
#define DP83822_LB_FIFO_INT_EN BIT(4)
#define DP83822_PAGE_RX_INT_EN BIT(5)
#define DP83822_ANEG_ERR_INT_EN BIT(6)
#define DP83822_EEE_ERROR_CHANGE_INT_EN BIT(7)
/* INT_STAT1 bits */
#define DP83822_WOL_INT_EN BIT(4)
#define DP83822_WOL_INT_STAT BIT(12)
#define MII_DP83822_RXSOP1 0x04a5
#define MII_DP83822_RXSOP2 0x04a6
#define MII_DP83822_RXSOP3 0x04a7
/* WoL Registers */
#define MII_DP83822_WOL_CFG 0x04a0
#define MII_DP83822_WOL_STAT 0x04a1
#define MII_DP83822_WOL_DA1 0x04a2
#define MII_DP83822_WOL_DA2 0x04a3
#define MII_DP83822_WOL_DA3 0x04a4
/* WoL bits */
#define DP83822_WOL_MAGIC_EN BIT(0)
#define DP83822_WOL_SECURE_ON BIT(5)
#define DP83822_WOL_EN BIT(7)
#define DP83822_WOL_INDICATION_SEL BIT(8)
#define DP83822_WOL_CLR_INDICATION BIT(11)
/* RCSR bits */
#define DP83822_RGMII_MODE_EN BIT(9)
#define DP83822_RX_CLK_SHIFT BIT(12)
#define DP83822_TX_CLK_SHIFT BIT(11)
/* SOR1 mode */
#define DP83822_STRAP_MODE1 0
#define DP83822_STRAP_MODE2 BIT(0)
#define DP83822_STRAP_MODE3 BIT(1)
#define DP83822_STRAP_MODE4 GENMASK(1, 0)
#define DP83822_COL_STRAP_MASK GENMASK(11, 10)
#define DP83822_COL_SHIFT 10
#define DP83822_RX_ER_STR_MASK GENMASK(9, 8)
#define DP83822_RX_ER_SHIFT 8
#define MII_DP83822_FIBER_ADVERTISE (ADVERTISED_TP | ADVERTISED_MII | \
ADVERTISED_FIBRE | \
ADVERTISED_Pause | ADVERTISED_Asym_Pause)
struct dp83822_private {
bool fx_signal_det_low;
int fx_enabled;
u16 fx_sd_enable;
};
static int dp83822_set_wol(struct phy_device *phydev,
struct ethtool_wolinfo *wol)
{
struct net_device *ndev = phydev->attached_dev;
u16 value;
const u8 *mac;
if (wol->wolopts & (WAKE_MAGIC | WAKE_MAGICSECURE)) {
mac = (const u8 *)ndev->dev_addr;
if (!is_valid_ether_addr(mac))
return -EINVAL;
/* MAC addresses start with byte 5, but stored in mac[0].
* 822 PHYs store bytes 4|5, 2|3, 0|1
*/
phy_write_mmd(phydev, DP83822_DEVADDR, MII_DP83822_WOL_DA1,
(mac[1] << 8) | mac[0]);
phy_write_mmd(phydev, DP83822_DEVADDR, MII_DP83822_WOL_DA2,
(mac[3] << 8) | mac[2]);
phy_write_mmd(phydev, DP83822_DEVADDR, MII_DP83822_WOL_DA3,
(mac[5] << 8) | mac[4]);
value = phy_read_mmd(phydev, DP83822_DEVADDR,
MII_DP83822_WOL_CFG);
if (wol->wolopts & WAKE_MAGIC)
value |= DP83822_WOL_MAGIC_EN;
else
value &= ~DP83822_WOL_MAGIC_EN;
if (wol->wolopts & WAKE_MAGICSECURE) {
phy_write_mmd(phydev, DP83822_DEVADDR,
MII_DP83822_RXSOP1,
(wol->sopass[1] << 8) | wol->sopass[0]);
phy_write_mmd(phydev, DP83822_DEVADDR,
MII_DP83822_RXSOP2,
(wol->sopass[3] << 8) | wol->sopass[2]);
phy_write_mmd(phydev, DP83822_DEVADDR,
MII_DP83822_RXSOP3,
(wol->sopass[5] << 8) | wol->sopass[4]);
value |= DP83822_WOL_SECURE_ON;
} else {
value &= ~DP83822_WOL_SECURE_ON;
}
/* Clear any pending WoL interrupt */
phy_read(phydev, MII_DP83822_MISR2);
value |= DP83822_WOL_EN | DP83822_WOL_INDICATION_SEL |
DP83822_WOL_CLR_INDICATION;
return phy_write_mmd(phydev, DP83822_DEVADDR,
MII_DP83822_WOL_CFG, value);
} else {
return phy_clear_bits_mmd(phydev, DP83822_DEVADDR,
MII_DP83822_WOL_CFG, DP83822_WOL_EN);
}
}
static void dp83822_get_wol(struct phy_device *phydev,
struct ethtool_wolinfo *wol)
{
int value;
u16 sopass_val;
wol->supported = (WAKE_MAGIC | WAKE_MAGICSECURE);
wol->wolopts = 0;
value = phy_read_mmd(phydev, DP83822_DEVADDR, MII_DP83822_WOL_CFG);
if (value & DP83822_WOL_MAGIC_EN)
wol->wolopts |= WAKE_MAGIC;
if (value & DP83822_WOL_SECURE_ON) {
sopass_val = phy_read_mmd(phydev, DP83822_DEVADDR,
MII_DP83822_RXSOP1);
wol->sopass[0] = (sopass_val & 0xff);
wol->sopass[1] = (sopass_val >> 8);
sopass_val = phy_read_mmd(phydev, DP83822_DEVADDR,
MII_DP83822_RXSOP2);
wol->sopass[2] = (sopass_val & 0xff);
wol->sopass[3] = (sopass_val >> 8);
sopass_val = phy_read_mmd(phydev, DP83822_DEVADDR,
MII_DP83822_RXSOP3);
wol->sopass[4] = (sopass_val & 0xff);
wol->sopass[5] = (sopass_val >> 8);
wol->wolopts |= WAKE_MAGICSECURE;
}
/* WoL is not enabled so set wolopts to 0 */
if (!(value & DP83822_WOL_EN))
wol->wolopts = 0;
}
static int dp83822_config_intr(struct phy_device *phydev)
{
struct dp83822_private *dp83822 = phydev->priv;
int misr_status;
int physcr_status;
int err;
if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
misr_status = phy_read(phydev, MII_DP83822_MISR1);
if (misr_status < 0)
return misr_status;
misr_status |= (DP83822_LINK_STAT_INT_EN |
DP83822_ENERGY_DET_INT_EN |
DP83822_LINK_QUAL_INT_EN);
/* Private data pointer is NULL on DP83825/26 */
if (!dp83822 || !dp83822->fx_enabled)
misr_status |= DP83822_ANEG_COMPLETE_INT_EN |
DP83822_DUP_MODE_CHANGE_INT_EN |
DP83822_SPEED_CHANGED_INT_EN;
err = phy_write(phydev, MII_DP83822_MISR1, misr_status);
if (err < 0)
return err;
misr_status = phy_read(phydev, MII_DP83822_MISR2);
if (misr_status < 0)
return misr_status;
misr_status |= (DP83822_JABBER_DET_INT_EN |
DP83822_SLEEP_MODE_INT_EN |
DP83822_LB_FIFO_INT_EN |
DP83822_PAGE_RX_INT_EN |
DP83822_EEE_ERROR_CHANGE_INT_EN);
/* Private data pointer is NULL on DP83825/26 */
if (!dp83822 || !dp83822->fx_enabled)
misr_status |= DP83822_ANEG_ERR_INT_EN |
DP83822_WOL_PKT_INT_EN;
err = phy_write(phydev, MII_DP83822_MISR2, misr_status);
if (err < 0)
return err;
physcr_status = phy_read(phydev, MII_DP83822_PHYSCR);
if (physcr_status < 0)
return physcr_status;
physcr_status |= DP83822_PHYSCR_INT_OE | DP83822_PHYSCR_INTEN;
} else {
err = phy_write(phydev, MII_DP83822_MISR1, 0);
if (err < 0)
return err;
err = phy_write(phydev, MII_DP83822_MISR2, 0);
if (err < 0)
return err;
physcr_status = phy_read(phydev, MII_DP83822_PHYSCR);
if (physcr_status < 0)
return physcr_status;
physcr_status &= ~DP83822_PHYSCR_INTEN;
}
return phy_write(phydev, MII_DP83822_PHYSCR, physcr_status);
}
static irqreturn_t dp83822_handle_interrupt(struct phy_device *phydev)
{
bool trigger_machine = false;
int irq_status;
/* The MISR1 and MISR2 registers are holding the interrupt status in
* the upper half (15:8), while the lower half (7:0) is used for
* controlling the interrupt enable state of those individual interrupt
* sources. To determine the possible interrupt sources, just read the
* MISR* register and use it directly to know which interrupts have
* been enabled previously or not.
*/
irq_status = phy_read(phydev, MII_DP83822_MISR1);
if (irq_status < 0) {
phy_error(phydev);
return IRQ_NONE;
}
if (irq_status & ((irq_status & GENMASK(7, 0)) << 8))
trigger_machine = true;
irq_status = phy_read(phydev, MII_DP83822_MISR2);
if (irq_status < 0) {
phy_error(phydev);
return IRQ_NONE;
}
if (irq_status & ((irq_status & GENMASK(7, 0)) << 8))
trigger_machine = true;
if (!trigger_machine)
return IRQ_NONE;
phy_trigger_machine(phydev);
return IRQ_HANDLED;
}
static int dp8382x_disable_wol(struct phy_device *phydev)
{
return phy_clear_bits_mmd(phydev, DP83822_DEVADDR, MII_DP83822_WOL_CFG,
DP83822_WOL_EN | DP83822_WOL_MAGIC_EN |
DP83822_WOL_SECURE_ON);
}
static int dp83822_read_status(struct phy_device *phydev)
{
struct dp83822_private *dp83822 = phydev->priv;
int status = phy_read(phydev, MII_DP83822_PHYSTS);
int ctrl2;
int ret;
if (dp83822->fx_enabled) {
if (status & DP83822_PHYSTS_LINK) {
phydev->speed = SPEED_UNKNOWN;
phydev->duplex = DUPLEX_UNKNOWN;
} else {
ctrl2 = phy_read(phydev, MII_DP83822_CTRL_2);
if (ctrl2 < 0)
return ctrl2;
if (!(ctrl2 & DP83822_FX_ENABLE)) {
ret = phy_write(phydev, MII_DP83822_CTRL_2,
DP83822_FX_ENABLE | ctrl2);
if (ret < 0)
return ret;
}
}
}
ret = genphy_read_status(phydev);
if (ret)
return ret;
if (status < 0)
return status;
if (status & DP83822_PHYSTS_DUPLEX)
phydev->duplex = DUPLEX_FULL;
else
phydev->duplex = DUPLEX_HALF;
if (status & DP83822_PHYSTS_10)
phydev->speed = SPEED_10;
else
phydev->speed = SPEED_100;
return 0;
}
static int dp83822_config_init(struct phy_device *phydev)
{
struct dp83822_private *dp83822 = phydev->priv;
struct device *dev = &phydev->mdio.dev;
int rgmii_delay;
s32 rx_int_delay;
s32 tx_int_delay;
int err = 0;
int bmcr;
if (phy_interface_is_rgmii(phydev)) {
rx_int_delay = phy_get_internal_delay(phydev, dev, NULL, 0,
true);
if (rx_int_delay <= 0)
rgmii_delay = 0;
else
rgmii_delay = DP83822_RX_CLK_SHIFT;
tx_int_delay = phy_get_internal_delay(phydev, dev, NULL, 0,
false);
if (tx_int_delay <= 0)
rgmii_delay &= ~DP83822_TX_CLK_SHIFT;
else
rgmii_delay |= DP83822_TX_CLK_SHIFT;
if (rgmii_delay) {
err = phy_set_bits_mmd(phydev, DP83822_DEVADDR,
MII_DP83822_RCSR, rgmii_delay);
if (err)
return err;
}
phy_set_bits_mmd(phydev, DP83822_DEVADDR,
MII_DP83822_RCSR, DP83822_RGMII_MODE_EN);
} else {
phy_clear_bits_mmd(phydev, DP83822_DEVADDR,
MII_DP83822_RCSR, DP83822_RGMII_MODE_EN);
}
if (dp83822->fx_enabled) {
err = phy_modify(phydev, MII_DP83822_CTRL_2,
DP83822_FX_ENABLE, 1);
if (err < 0)
return err;
/* Only allow advertising what this PHY supports */
linkmode_and(phydev->advertising, phydev->advertising,
phydev->supported);
linkmode_set_bit(ETHTOOL_LINK_MODE_FIBRE_BIT,
phydev->supported);
linkmode_set_bit(ETHTOOL_LINK_MODE_FIBRE_BIT,
phydev->advertising);
linkmode_set_bit(ETHTOOL_LINK_MODE_100baseFX_Full_BIT,
phydev->supported);
linkmode_set_bit(ETHTOOL_LINK_MODE_100baseFX_Half_BIT,
phydev->supported);
linkmode_set_bit(ETHTOOL_LINK_MODE_100baseFX_Full_BIT,
phydev->advertising);
linkmode_set_bit(ETHTOOL_LINK_MODE_100baseFX_Half_BIT,
phydev->advertising);
/* Auto neg is not supported in fiber mode */
bmcr = phy_read(phydev, MII_BMCR);
if (bmcr < 0)
return bmcr;
if (bmcr & BMCR_ANENABLE) {
err = phy_modify(phydev, MII_BMCR, BMCR_ANENABLE, 0);
if (err < 0)
return err;
}
phydev->autoneg = AUTONEG_DISABLE;
linkmode_clear_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
phydev->supported);
linkmode_clear_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
phydev->advertising);
/* Setup fiber advertisement */
err = phy_modify_changed(phydev, MII_ADVERTISE,
MII_DP83822_FIBER_ADVERTISE,
MII_DP83822_FIBER_ADVERTISE);
if (err < 0)
return err;
if (dp83822->fx_signal_det_low) {
err = phy_set_bits_mmd(phydev, DP83822_DEVADDR,
MII_DP83822_GENCFG,
DP83822_SIG_DET_LOW);
if (err)
return err;
}
}
return dp8382x_disable_wol(phydev);
}
static int dp8382x_config_init(struct phy_device *phydev)
{
return dp8382x_disable_wol(phydev);
}
static int dp83822_phy_reset(struct phy_device *phydev)
{
int err;
err = phy_write(phydev, MII_DP83822_RESET_CTRL, DP83822_SW_RESET);
if (err < 0)
return err;
return phydev->drv->config_init(phydev);
}
#ifdef CONFIG_OF_MDIO
static int dp83822_of_init(struct phy_device *phydev)
{
struct dp83822_private *dp83822 = phydev->priv;
struct device *dev = &phydev->mdio.dev;
/* Signal detection for the PHY is only enabled if the FX_EN and the
* SD_EN pins are strapped. Signal detection can only enabled if FX_EN
* is strapped otherwise signal detection is disabled for the PHY.
*/
if (dp83822->fx_enabled && dp83822->fx_sd_enable)
dp83822->fx_signal_det_low = device_property_present(dev,
"ti,link-loss-low");
if (!dp83822->fx_enabled)
dp83822->fx_enabled = device_property_present(dev,
"ti,fiber-mode");
return 0;
}
#else
static int dp83822_of_init(struct phy_device *phydev)
{
return 0;
}
#endif /* CONFIG_OF_MDIO */
static int dp83822_read_straps(struct phy_device *phydev)
{
struct dp83822_private *dp83822 = phydev->priv;
int fx_enabled, fx_sd_enable;
int val;
val = phy_read_mmd(phydev, DP83822_DEVADDR, MII_DP83822_SOR1);
if (val < 0)
return val;
phydev_dbg(phydev, "SOR1 strap register: 0x%04x\n", val);
fx_enabled = (val & DP83822_COL_STRAP_MASK) >> DP83822_COL_SHIFT;
if (fx_enabled == DP83822_STRAP_MODE2 ||
fx_enabled == DP83822_STRAP_MODE3)
dp83822->fx_enabled = 1;
if (dp83822->fx_enabled) {
fx_sd_enable = (val & DP83822_RX_ER_STR_MASK) >> DP83822_RX_ER_SHIFT;
if (fx_sd_enable == DP83822_STRAP_MODE3 ||
fx_sd_enable == DP83822_STRAP_MODE4)
dp83822->fx_sd_enable = 1;
}
return 0;
}
static int dp83822_probe(struct phy_device *phydev)
{
struct dp83822_private *dp83822;
int ret;
dp83822 = devm_kzalloc(&phydev->mdio.dev, sizeof(*dp83822),
GFP_KERNEL);
if (!dp83822)
return -ENOMEM;
phydev->priv = dp83822;
ret = dp83822_read_straps(phydev);
if (ret)
return ret;
dp83822_of_init(phydev);
if (dp83822->fx_enabled)
phydev->port = PORT_FIBRE;
return 0;
}
static int dp83822_suspend(struct phy_device *phydev)
{
int value;
value = phy_read_mmd(phydev, DP83822_DEVADDR, MII_DP83822_WOL_CFG);
if (!(value & DP83822_WOL_EN))
genphy_suspend(phydev);
return 0;
}
static int dp83822_resume(struct phy_device *phydev)
{
int value;
genphy_resume(phydev);
value = phy_read_mmd(phydev, DP83822_DEVADDR, MII_DP83822_WOL_CFG);
phy_write_mmd(phydev, DP83822_DEVADDR, MII_DP83822_WOL_CFG, value |
DP83822_WOL_CLR_INDICATION);
return 0;
}
#define DP83822_PHY_DRIVER(_id, _name) \
{ \
PHY_ID_MATCH_MODEL(_id), \
.name = (_name), \
/* PHY_BASIC_FEATURES */ \
.probe = dp83822_probe, \
.soft_reset = dp83822_phy_reset, \
.config_init = dp83822_config_init, \
.read_status = dp83822_read_status, \
.get_wol = dp83822_get_wol, \
.set_wol = dp83822_set_wol, \
.config_intr = dp83822_config_intr, \
.handle_interrupt = dp83822_handle_interrupt, \
.suspend = dp83822_suspend, \
.resume = dp83822_resume, \
}
#define DP8382X_PHY_DRIVER(_id, _name) \
{ \
PHY_ID_MATCH_MODEL(_id), \
.name = (_name), \
/* PHY_BASIC_FEATURES */ \
.soft_reset = dp83822_phy_reset, \
.config_init = dp8382x_config_init, \
.get_wol = dp83822_get_wol, \
.set_wol = dp83822_set_wol, \
.config_intr = dp83822_config_intr, \
.handle_interrupt = dp83822_handle_interrupt, \
.suspend = dp83822_suspend, \
.resume = dp83822_resume, \
}
static struct phy_driver dp83822_driver[] = {
DP83822_PHY_DRIVER(DP83822_PHY_ID, "TI DP83822"),
DP8382X_PHY_DRIVER(DP83825I_PHY_ID, "TI DP83825I"),
DP8382X_PHY_DRIVER(DP83826C_PHY_ID, "TI DP83826C"),
DP8382X_PHY_DRIVER(DP83826NC_PHY_ID, "TI DP83826NC"),
DP8382X_PHY_DRIVER(DP83825S_PHY_ID, "TI DP83825S"),
DP8382X_PHY_DRIVER(DP83825CM_PHY_ID, "TI DP83825M"),
DP8382X_PHY_DRIVER(DP83825CS_PHY_ID, "TI DP83825CS"),
};
module_phy_driver(dp83822_driver);
static struct mdio_device_id __maybe_unused dp83822_tbl[] = {
{ DP83822_PHY_ID, 0xfffffff0 },
{ DP83825I_PHY_ID, 0xfffffff0 },
{ DP83826C_PHY_ID, 0xfffffff0 },
{ DP83826NC_PHY_ID, 0xfffffff0 },
{ DP83825S_PHY_ID, 0xfffffff0 },
{ DP83825CM_PHY_ID, 0xfffffff0 },
{ DP83825CS_PHY_ID, 0xfffffff0 },
{ },
};
MODULE_DEVICE_TABLE(mdio, dp83822_tbl);
MODULE_DESCRIPTION("Texas Instruments DP83822 PHY driver");
MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com");
MODULE_LICENSE("GPL v2");
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