blob: e8412b1a20a41869a6ff557d0966f3ec306d3fe5 [file] [log] [blame] [edit]
/*
* Copyright (c) 2019 Interay Solutions B.V.
* Copyright (c) 2019 Oane Kingma
*
* SPDX-License-Identifier: Apache-2.0
*/
/* SiLabs Giant Gecko GG11 Ethernet PHY driver. */
#include <errno.h>
#include <zephyr/kernel.h>
#include <zephyr/net/mii.h>
#include "phy_gecko.h"
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(eth_gecko_phy, CONFIG_ETHERNET_LOG_LEVEL);
/* Maximum time to establish a link through auto-negotiation for
* 10BASE-T, 100BASE-TX is 3.7s, to add an extra margin the timeout
* is set at 4s.
*/
#define PHY_AUTONEG_TIMEOUT_MS 4000
/* Enable MDIO serial bus between MAC and PHY. */
static void mdio_bus_enable(ETH_TypeDef *eth)
{
eth->NETWORKCTRL |= ETH_NETWORKCTRL_MANPORTEN;
}
/* Enable MDIO serial bus between MAC and PHY. */
static void mdio_bus_disable(ETH_TypeDef *eth)
{
eth->NETWORKCTRL &= ~ETH_NETWORKCTRL_MANPORTEN;
}
/* Wait PHY operation complete. */
static int mdio_bus_wait(ETH_TypeDef *eth)
{
uint32_t retries = 100U; /* will wait up to 1 s */
while (!(eth->NETWORKSTATUS & ETH_NETWORKSTATUS_MANDONE)) {
if (retries-- == 0U) {
LOG_ERR("timeout");
return -ETIMEDOUT;
}
k_sleep(K_MSEC(10));
}
return 0;
}
/* Send command to PHY over MDIO serial bus */
static int mdio_bus_send(ETH_TypeDef *eth, uint8_t phy_addr, uint8_t reg_addr,
uint8_t rw, uint16_t data)
{
int retval;
/* Write PHY management register */
eth->PHYMNGMNT = ETH_PHYMNGMNT_WRITE0_DEFAULT
| ETH_PHYMNGMNT_WRITE1
| ((rw ? 0x02 : 0x01) << _ETH_PHYMNGMNT_OPERATION_SHIFT)
| ((phy_addr << _ETH_PHYMNGMNT_PHYADDR_SHIFT)
& _ETH_PHYMNGMNT_PHYADDR_MASK)
| ((reg_addr << _ETH_PHYMNGMNT_REGADDR_SHIFT)
& _ETH_PHYMNGMNT_REGADDR_MASK)
| (0x2 << _ETH_PHYMNGMNT_WRITE10_SHIFT)
| (data & _ETH_PHYMNGMNT_PHYRWDATA_MASK);
/* Wait until PHY is ready */
retval = mdio_bus_wait(eth);
if (retval < 0) {
return retval;
}
return 0;
}
/* Read PHY register. */
static int phy_read(const struct phy_gecko_dev *phy, uint8_t reg_addr,
uint32_t *value)
{
ETH_TypeDef *const eth = phy->regs;
uint8_t phy_addr = phy->address;
int retval;
retval = mdio_bus_send(eth, phy_addr, reg_addr, 1, 0);
if (retval < 0) {
return retval;
}
/* Read data */
*value = eth->PHYMNGMNT & _ETH_PHYMNGMNT_PHYRWDATA_MASK;
return 0;
}
/* Write PHY register. */
static int phy_write(const struct phy_gecko_dev *phy, uint8_t reg_addr,
uint32_t value)
{
ETH_TypeDef *const eth = phy->regs;
uint8_t phy_addr = phy->address;
return mdio_bus_send(eth, phy_addr, reg_addr, 0, value);
}
/* Issue a PHY soft reset. */
static int phy_soft_reset(const struct phy_gecko_dev *phy)
{
uint32_t phy_reg;
uint32_t retries = 12U;
int retval;
/* Issue a soft reset */
retval = phy_write(phy, MII_BMCR, MII_BMCR_RESET);
if (retval < 0) {
return retval;
}
/* Wait up to 0.6s for the reset sequence to finish. According to
* IEEE 802.3, Section 2, Subsection 22.2.4.1.1 a PHY reset may take
* up to 0.5 s.
*/
do {
if (retries-- == 0U) {
return -ETIMEDOUT;
}
k_sleep(K_MSEC(50));
retval = phy_read(phy, MII_BMCR, &phy_reg);
if (retval < 0) {
return retval;
}
} while (phy_reg & MII_BMCR_RESET);
return 0;
}
int phy_gecko_init(const struct phy_gecko_dev *phy)
{
ETH_TypeDef *const eth = phy->regs;
int phy_id;
mdio_bus_enable(eth);
LOG_INF("Soft Reset of ETH PHY");
phy_soft_reset(phy);
/* Verify that the PHY device is responding */
phy_id = phy_gecko_id_get(phy);
if (phy_id == 0xFFFFFFFF) {
LOG_ERR("Unable to detect a valid PHY");
return -1;
}
LOG_INF("PHYID: 0x%X at addr: %d", phy_id, phy->address);
mdio_bus_disable(eth);
return 0;
}
uint32_t phy_gecko_id_get(const struct phy_gecko_dev *phy)
{
ETH_TypeDef *const eth = phy->regs;
uint32_t phy_reg;
uint32_t phy_id;
mdio_bus_enable(eth);
if (phy_read(phy, MII_PHYID1R, &phy_reg) < 0) {
return 0xFFFFFFFF;
}
phy_id = (phy_reg & 0xFFFF) << 16;
if (phy_read(phy, MII_PHYID2R, &phy_reg) < 0) {
return 0xFFFFFFFF;
}
phy_id |= (phy_reg & 0xFFFF);
mdio_bus_disable(eth);
return phy_id;
}
int phy_gecko_auto_negotiate(const struct phy_gecko_dev *phy,
uint32_t *status)
{
ETH_TypeDef *const eth = phy->regs;
uint32_t val;
uint32_t ability_adv;
uint32_t ability_rcvd;
uint32_t retries = PHY_AUTONEG_TIMEOUT_MS / 100;
int retval;
mdio_bus_enable(eth);
LOG_DBG("Starting ETH PHY auto-negotiate sequence");
/* Read PHY default advertising parameters */
retval = phy_read(phy, MII_ANAR, &ability_adv);
if (retval < 0) {
goto auto_negotiate_exit;
}
/* Configure and start auto-negotiation process */
retval = phy_read(phy, MII_BMCR, &val);
if (retval < 0) {
goto auto_negotiate_exit;
}
val |= MII_BMCR_AUTONEG_ENABLE | MII_BMCR_AUTONEG_RESTART;
val &= ~MII_BMCR_ISOLATE; /* Don't isolate the PHY */
retval = phy_write(phy, MII_BMCR, val);
if (retval < 0) {
goto auto_negotiate_exit;
}
/* Wait for the auto-negotiation process to complete */
do {
if (retries-- == 0U) {
retval = -ETIMEDOUT;
goto auto_negotiate_exit;
}
k_sleep(K_MSEC(100));
retval = phy_read(phy, MII_BMSR, &val);
if (retval < 0) {
goto auto_negotiate_exit;
}
} while (!(val & MII_BMSR_AUTONEG_COMPLETE));
LOG_DBG("PHY auto-negotiate sequence completed");
/* Read abilities of the remote device */
retval = phy_read(phy, MII_ANLPAR, &ability_rcvd);
if (retval < 0) {
goto auto_negotiate_exit;
}
/* Determine the best possible mode of operation */
if ((ability_adv & ability_rcvd) & MII_ADVERTISE_100_FULL) {
*status = ETH_NETWORKCFG_FULLDUPLEX | ETH_NETWORKCFG_SPEED;
} else if ((ability_adv & ability_rcvd) & MII_ADVERTISE_100_HALF) {
*status = ETH_NETWORKCFG_SPEED;
} else if ((ability_adv & ability_rcvd) & MII_ADVERTISE_10_FULL) {
*status = ETH_NETWORKCFG_FULLDUPLEX;
} else {
*status = 0;
}
LOG_DBG("common abilities: speed %s Mb, %s duplex",
*status & ETH_NETWORKCFG_SPEED ? "100" : "10",
*status & ETH_NETWORKCFG_FULLDUPLEX ? "full" : "half");
auto_negotiate_exit:
mdio_bus_disable(eth);
return retval;
}
bool phy_gecko_is_linked(const struct phy_gecko_dev *phy)
{
ETH_TypeDef *const eth = phy->regs;
uint32_t phy_reg;
bool phy_linked = false;
mdio_bus_enable(eth);
if (phy_read(phy, MII_BMSR, &phy_reg) < 0) {
return phy_linked;
}
phy_linked = (phy_reg & MII_BMSR_LINK_STATUS);
mdio_bus_disable(eth);
return phy_linked;
}