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net: phy: add Broadcom BCM54140 support 

The Broadcom BCM54140 is a Quad SGMII/QSGMII Copper/Fiber Gigabit
Ethernet transceiver.

This also adds support for tunables to set and get downshift and
energy detect auto power-down.

The PHY has four ports and each port has its own PHY address.
There are per-port registers as well as global registers.
Unfortunately, the global registers can only be accessed by reading
and writing from/to the PHY address of the first port. Further,
there is no way to find out what port you actually are by just
reading the per-port registers. We therefore, have to scan the
bus on the PHY probe to determine the port and thus what address
we need to access the global registers.

Signed-off-by: Michael Walle <michael@walle.cc>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michael Walle 2020-04-20 20:21:12 +02:00 committed by David S. Miller
parent 0a32f1ff2a
commit 6937602ed3
4 changed files with 493 additions and 0 deletions
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10
drivers/net/phy/Kconfig
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@ -346,6 +346,16 @@ config BROADCOM_PHY
Currently supports the BCM5411, BCM5421, BCM5461, BCM54616S, BCM5464,
BCM5481, BCM54810 and BCM5482 PHYs.
config BCM54140_PHY
tristate "Broadcom BCM54140 PHY"
depends on PHYLIB
select BCM_NET_PHYLIB
help
Support the Broadcom BCM54140 Quad SGMII/QSGMII PHY.
This driver also supports the hardware monitoring of this PHY and
exposes voltage and temperature sensors.
config BCM84881_PHY
tristate "Broadcom BCM84881 PHY"
depends on PHYLIB

1
drivers/net/phy/Makefile
View File

@ -68,6 +68,7 @@ obj-$(CONFIG_BCM87XX_PHY) += bcm87xx.o
obj-$(CONFIG_BCM_CYGNUS_PHY) += bcm-cygnus.o
obj-$(CONFIG_BCM_NET_PHYLIB) += bcm-phy-lib.o
obj-$(CONFIG_BROADCOM_PHY) += broadcom.o
obj-$(CONFIG_BCM54140_PHY) += bcm54140.o
obj-$(CONFIG_BCM84881_PHY) += bcm84881.o
obj-$(CONFIG_CICADA_PHY) += cicada.o
obj-$(CONFIG_CORTINA_PHY) += cortina.o

481
drivers/net/phy/bcm54140.c Normal file
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@ -0,0 +1,481 @@
// SPDX-License-Identifier: GPL-2.0+
/* Broadcom BCM54140 Quad SGMII/QSGMII Copper/Fiber Gigabit PHY
*
* Copyright (c) 2020 Michael Walle <michael@walle.cc>
*/
#include <linux/bitfield.h>
#include <linux/brcmphy.h>
#include <linux/module.h>
#include <linux/phy.h>
#include "bcm-phy-lib.h"
/* RDB per-port registers
*/
#define BCM54140_RDB_ISR 0x00a /* interrupt status */
#define BCM54140_RDB_IMR 0x00b /* interrupt mask */
#define BCM54140_RDB_INT_LINK BIT(1) /* link status changed */
#define BCM54140_RDB_INT_SPEED BIT(2) /* link speed change */
#define BCM54140_RDB_INT_DUPLEX BIT(3) /* duplex mode changed */
#define BCM54140_RDB_SPARE1 0x012 /* spare control 1 */
#define BCM54140_RDB_SPARE1_LSLM BIT(2) /* link speed LED mode */
#define BCM54140_RDB_SPARE2 0x014 /* spare control 2 */
#define BCM54140_RDB_SPARE2_WS_RTRY_DIS BIT(8) /* wirespeed retry disable */
#define BCM54140_RDB_SPARE2_WS_RTRY_LIMIT GENMASK(4, 2) /* retry limit */
#define BCM54140_RDB_SPARE3 0x015 /* spare control 3 */
#define BCM54140_RDB_SPARE3_BIT0 BIT(0)
#define BCM54140_RDB_LED_CTRL 0x019 /* LED control */
#define BCM54140_RDB_LED_CTRL_ACTLINK0 BIT(4)
#define BCM54140_RDB_LED_CTRL_ACTLINK1 BIT(8)
#define BCM54140_RDB_C_APWR 0x01a /* auto power down control */
#define BCM54140_RDB_C_APWR_SINGLE_PULSE BIT(8) /* single pulse */
#define BCM54140_RDB_C_APWR_APD_MODE_DIS 0 /* ADP disable */
#define BCM54140_RDB_C_APWR_APD_MODE_EN 1 /* ADP enable */
#define BCM54140_RDB_C_APWR_APD_MODE_DIS2 2 /* ADP disable */
#define BCM54140_RDB_C_APWR_APD_MODE_EN_ANEG 3 /* ADP enable w/ aneg */
#define BCM54140_RDB_C_APWR_APD_MODE_MASK GENMASK(6, 5)
#define BCM54140_RDB_C_APWR_SLP_TIM_MASK BIT(4)/* sleep timer */
#define BCM54140_RDB_C_APWR_SLP_TIM_2_7 0 /* 2.7s */
#define BCM54140_RDB_C_APWR_SLP_TIM_5_4 1 /* 5.4s */
#define BCM54140_RDB_C_PWR 0x02a /* copper power control */
#define BCM54140_RDB_C_PWR_ISOLATE BIT(5) /* super isolate mode */
#define BCM54140_RDB_C_MISC_CTRL 0x02f /* misc copper control */
#define BCM54140_RDB_C_MISC_CTRL_WS_EN BIT(4) /* wirespeed enable */
/* RDB global registers
*/
#define BCM54140_RDB_TOP_IMR 0x82d /* interrupt mask */
#define BCM54140_RDB_TOP_IMR_PORT0 BIT(4)
#define BCM54140_RDB_TOP_IMR_PORT1 BIT(5)
#define BCM54140_RDB_TOP_IMR_PORT2 BIT(6)
#define BCM54140_RDB_TOP_IMR_PORT3 BIT(7)
#define BCM54140_DEFAULT_DOWNSHIFT 5
#define BCM54140_MAX_DOWNSHIFT 9
struct bcm54140_priv {
int port;
int base_addr;
};
static int bcm54140_base_read_rdb(struct phy_device *phydev, u16 rdb)
{
struct bcm54140_priv *priv = phydev->priv;
struct mii_bus *bus = phydev->mdio.bus;
int ret;
mutex_lock(&bus->mdio_lock);
ret = __mdiobus_write(bus, priv->base_addr, MII_BCM54XX_RDB_ADDR, rdb);
if (ret < 0)
goto out;
ret = __mdiobus_read(bus, priv->base_addr, MII_BCM54XX_RDB_DATA);
out:
mutex_unlock(&bus->mdio_lock);
return ret;
}
static int bcm54140_base_write_rdb(struct phy_device *phydev,
u16 rdb, u16 val)
{
struct bcm54140_priv *priv = phydev->priv;
struct mii_bus *bus = phydev->mdio.bus;
int ret;
mutex_lock(&bus->mdio_lock);
ret = __mdiobus_write(bus, priv->base_addr, MII_BCM54XX_RDB_ADDR, rdb);
if (ret < 0)
goto out;
ret = __mdiobus_write(bus, priv->base_addr, MII_BCM54XX_RDB_DATA, val);
out:
mutex_unlock(&bus->mdio_lock);
return ret;
}
/* Under some circumstances a core PLL may not lock, this will then prevent
* a successful link establishment. Restart the PLL after the voltages are
* stable to workaround this issue.
*/
static int bcm54140_b0_workaround(struct phy_device *phydev)
{
int spare3;
int ret;
spare3 = bcm_phy_read_rdb(phydev, BCM54140_RDB_SPARE3);
if (spare3 < 0)
return spare3;
spare3 &= ~BCM54140_RDB_SPARE3_BIT0;
ret = bcm_phy_write_rdb(phydev, BCM54140_RDB_SPARE3, spare3);
if (ret)
return ret;
ret = phy_modify(phydev, MII_BMCR, 0, BMCR_PDOWN);
if (ret)
return ret;
ret = phy_modify(phydev, MII_BMCR, BMCR_PDOWN, 0);
if (ret)
return ret;
spare3 |= BCM54140_RDB_SPARE3_BIT0;
return bcm_phy_write_rdb(phydev, BCM54140_RDB_SPARE3, spare3);
}
/* The BCM54140 is a quad PHY where only the first port has access to the
* global register. Thus we need to find out its PHY address.
*
*/
static int bcm54140_get_base_addr_and_port(struct phy_device *phydev)
{
struct bcm54140_priv *priv = phydev->priv;
struct mii_bus *bus = phydev->mdio.bus;
int addr, min_addr, max_addr;
int step = 1;
u32 phy_id;
int tmp;
min_addr = phydev->mdio.addr;
max_addr = phydev->mdio.addr;
addr = phydev->mdio.addr;
/* We scan forward and backwards and look for PHYs which have the
* same phy_id like we do. Step 1 will scan forward, step 2
* backwards. Once we are finished, we have a min_addr and
* max_addr which resembles the range of PHY addresses of the same
* type of PHY. There is one caveat; there may be many PHYs of
* the same type, but we know that each PHY takes exactly 4
* consecutive addresses. Therefore we can deduce our offset
* to the base address of this quad PHY.
*/
while (1) {
if (step == 3) {
break;
} else if (step == 1) {
max_addr = addr;
addr++;
} else {
min_addr = addr;
addr--;
}
if (addr < 0 || addr >= PHY_MAX_ADDR) {
addr = phydev->mdio.addr;
step++;
continue;
}
/* read the PHY id */
tmp = mdiobus_read(bus, addr, MII_PHYSID1);
if (tmp < 0)
return tmp;
phy_id = tmp << 16;
tmp = mdiobus_read(bus, addr, MII_PHYSID2);
if (tmp < 0)
return tmp;
phy_id |= tmp;
/* see if it is still the same PHY */
if ((phy_id & phydev->drv->phy_id_mask) !=
(phydev->drv->phy_id & phydev->drv->phy_id_mask)) {
addr = phydev->mdio.addr;
step++;
}
}
/* The range we get should be a multiple of four. Please note that both
* the min_addr and max_addr are inclusive. So we have to add one if we
* subtract them.
*/
if ((max_addr - min_addr + 1) % 4) {
dev_err(&phydev->mdio.dev,
"Detected Quad PHY IDs %d..%d doesn't make sense.\n",
min_addr, max_addr);
return -EINVAL;
}
priv->port = (phydev->mdio.addr - min_addr) % 4;
priv->base_addr = phydev->mdio.addr - priv->port;
return 0;
}
static int bcm54140_probe(struct phy_device *phydev)
{
struct bcm54140_priv *priv;
int ret;
priv = devm_kzalloc(&phydev->mdio.dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
phydev->priv = priv;
ret = bcm54140_get_base_addr_and_port(phydev);
if (ret)
return ret;
phydev_dbg(phydev, "probed (port %d, base PHY address %d)\n",
priv->port, priv->base_addr);
return 0;
}
static int bcm54140_config_init(struct phy_device *phydev)
{
u16 reg = 0xffff;
int ret;
/* Apply hardware errata */
ret = bcm54140_b0_workaround(phydev);
if (ret)
return ret;
/* Unmask events we are interested in. */
reg &= ~(BCM54140_RDB_INT_DUPLEX |
BCM54140_RDB_INT_SPEED |
BCM54140_RDB_INT_LINK);
ret = bcm_phy_write_rdb(phydev, BCM54140_RDB_IMR, reg);
if (ret)
return ret;
/* LED1=LINKSPD[1], LED2=LINKSPD[2], LED3=LINK/ACTIVITY */
ret = bcm_phy_modify_rdb(phydev, BCM54140_RDB_SPARE1,
0, BCM54140_RDB_SPARE1_LSLM);
if (ret)
return ret;
ret = bcm_phy_modify_rdb(phydev, BCM54140_RDB_LED_CTRL,
0, BCM54140_RDB_LED_CTRL_ACTLINK0);
if (ret)
return ret;
/* disable super isolate mode */
return bcm_phy_modify_rdb(phydev, BCM54140_RDB_C_PWR,
BCM54140_RDB_C_PWR_ISOLATE, 0);
}
int bcm54140_did_interrupt(struct phy_device *phydev)
{
int ret;
ret = bcm_phy_read_rdb(phydev, BCM54140_RDB_ISR);
return (ret < 0) ? 0 : ret;
}
int bcm54140_ack_intr(struct phy_device *phydev)
{
int reg;
/* clear pending interrupts */
reg = bcm_phy_read_rdb(phydev, BCM54140_RDB_ISR);
if (reg < 0)
return reg;
return 0;
}
int bcm54140_config_intr(struct phy_device *phydev)
{
struct bcm54140_priv *priv = phydev->priv;
static const u16 port_to_imr_bit[] = {
BCM54140_RDB_TOP_IMR_PORT0, BCM54140_RDB_TOP_IMR_PORT1,
BCM54140_RDB_TOP_IMR_PORT2, BCM54140_RDB_TOP_IMR_PORT3,
};
int reg;
if (priv->port >= ARRAY_SIZE(port_to_imr_bit))
return -EINVAL;
reg = bcm54140_base_read_rdb(phydev, BCM54140_RDB_TOP_IMR);
if (reg < 0)
return reg;
if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
reg &= ~port_to_imr_bit[priv->port];
else
reg |= port_to_imr_bit[priv->port];
return bcm54140_base_write_rdb(phydev, BCM54140_RDB_TOP_IMR, reg);
}
static int bcm54140_get_downshift(struct phy_device *phydev, u8 *data)
{
int val;
val = bcm_phy_read_rdb(phydev, BCM54140_RDB_C_MISC_CTRL);
if (val < 0)
return val;
if (!(val & BCM54140_RDB_C_MISC_CTRL_WS_EN)) {
*data = DOWNSHIFT_DEV_DISABLE;
return 0;
}
val = bcm_phy_read_rdb(phydev, BCM54140_RDB_SPARE2);
if (val < 0)
return val;
if (val & BCM54140_RDB_SPARE2_WS_RTRY_DIS)
*data = 1;
else
*data = FIELD_GET(BCM54140_RDB_SPARE2_WS_RTRY_LIMIT, val) + 2;
return 0;
}
static int bcm54140_set_downshift(struct phy_device *phydev, u8 cnt)
{
u16 mask, set;
int ret;
if (cnt > BCM54140_MAX_DOWNSHIFT && cnt != DOWNSHIFT_DEV_DEFAULT_COUNT)
return -EINVAL;
if (!cnt)
return bcm_phy_modify_rdb(phydev, BCM54140_RDB_C_MISC_CTRL,
BCM54140_RDB_C_MISC_CTRL_WS_EN, 0);
if (cnt == DOWNSHIFT_DEV_DEFAULT_COUNT)
cnt = BCM54140_DEFAULT_DOWNSHIFT;
if (cnt == 1) {
mask = 0;
set = BCM54140_RDB_SPARE2_WS_RTRY_DIS;
} else {
mask = BCM54140_RDB_SPARE2_WS_RTRY_DIS;
mask |= BCM54140_RDB_SPARE2_WS_RTRY_LIMIT;
set = FIELD_PREP(BCM54140_RDB_SPARE2_WS_RTRY_LIMIT, cnt - 2);
}
ret = bcm_phy_modify_rdb(phydev, BCM54140_RDB_SPARE2,
mask, set);
if (ret)
return ret;
return bcm_phy_modify_rdb(phydev, BCM54140_RDB_C_MISC_CTRL,
0, BCM54140_RDB_C_MISC_CTRL_WS_EN);
}
static int bcm54140_get_edpd(struct phy_device *phydev, u16 *tx_interval)
{
int val;
val = bcm_phy_read_rdb(phydev, BCM54140_RDB_C_APWR);
if (val < 0)
return val;
switch (FIELD_GET(BCM54140_RDB_C_APWR_APD_MODE_MASK, val)) {
case BCM54140_RDB_C_APWR_APD_MODE_DIS:
case BCM54140_RDB_C_APWR_APD_MODE_DIS2:
*tx_interval = ETHTOOL_PHY_EDPD_DISABLE;
break;
case BCM54140_RDB_C_APWR_APD_MODE_EN:
case BCM54140_RDB_C_APWR_APD_MODE_EN_ANEG:
switch (FIELD_GET(BCM54140_RDB_C_APWR_SLP_TIM_MASK, val)) {
case BCM54140_RDB_C_APWR_SLP_TIM_2_7:
*tx_interval = 2700;
break;
case BCM54140_RDB_C_APWR_SLP_TIM_5_4:
*tx_interval = 5400;
break;
}
}
return 0;
}
static int bcm54140_set_edpd(struct phy_device *phydev, u16 tx_interval)
{
u16 mask, set;
mask = BCM54140_RDB_C_APWR_APD_MODE_MASK;
if (tx_interval == ETHTOOL_PHY_EDPD_DISABLE)
set = FIELD_PREP(BCM54140_RDB_C_APWR_APD_MODE_MASK,
BCM54140_RDB_C_APWR_APD_MODE_DIS);
else
set = FIELD_PREP(BCM54140_RDB_C_APWR_APD_MODE_MASK,
BCM54140_RDB_C_APWR_APD_MODE_EN_ANEG);
/* enable single pulse mode */
set |= BCM54140_RDB_C_APWR_SINGLE_PULSE;
/* set sleep timer */
mask |= BCM54140_RDB_C_APWR_SLP_TIM_MASK;
switch (tx_interval) {
case ETHTOOL_PHY_EDPD_DFLT_TX_MSECS:
case ETHTOOL_PHY_EDPD_DISABLE:
case 2700:
set |= BCM54140_RDB_C_APWR_SLP_TIM_2_7;
break;
case 5400:
set |= BCM54140_RDB_C_APWR_SLP_TIM_5_4;
break;
default:
return -EINVAL;
}
return bcm_phy_modify_rdb(phydev, BCM54140_RDB_C_APWR, mask, set);
}
static int bcm54140_get_tunable(struct phy_device *phydev,
struct ethtool_tunable *tuna, void *data)
{
switch (tuna->id) {
case ETHTOOL_PHY_DOWNSHIFT:
return bcm54140_get_downshift(phydev, data);
case ETHTOOL_PHY_EDPD:
return bcm54140_get_edpd(phydev, data);
default:
return -EOPNOTSUPP;
}
}
static int bcm54140_set_tunable(struct phy_device *phydev,
struct ethtool_tunable *tuna, const void *data)
{
switch (tuna->id) {
case ETHTOOL_PHY_DOWNSHIFT:
return bcm54140_set_downshift(phydev, *(const u8 *)data);
case ETHTOOL_PHY_EDPD:
return bcm54140_set_edpd(phydev, *(const u16 *)data);
default:
return -EOPNOTSUPP;
}
}
static struct phy_driver bcm54140_drivers[] = {
{
.phy_id = PHY_ID_BCM54140,
.phy_id_mask = 0xfffffff0,
.name = "Broadcom BCM54140",
.features = PHY_GBIT_FEATURES,
.config_init = bcm54140_config_init,
.did_interrupt = bcm54140_did_interrupt,
.ack_interrupt = bcm54140_ack_intr,
.config_intr = bcm54140_config_intr,
.probe = bcm54140_probe,
.suspend = genphy_suspend,
.resume = genphy_resume,
.get_tunable = bcm54140_get_tunable,
.set_tunable = bcm54140_set_tunable,
},
};
module_phy_driver(bcm54140_drivers);
static struct mdio_device_id __maybe_unused bcm54140_tbl[] = {
{ PHY_ID_BCM54140, 0xfffffff0 },
{ }
};
MODULE_AUTHOR("Michael Walle");
MODULE_DESCRIPTION("Broadcom BCM54140 PHY driver");
MODULE_DEVICE_TABLE(mdio, bcm54140_tbl);
MODULE_LICENSE("GPL");

1
include/linux/brcmphy.h
View File

@ -25,6 +25,7 @@
#define PHY_ID_BCM5461 0x002060c0
#define PHY_ID_BCM54612E 0x03625e60
#define PHY_ID_BCM54616S 0x03625d10
#define PHY_ID_BCM54140 0xae025019
#define PHY_ID_BCM57780 0x03625d90
#define PHY_ID_BCM89610 0x03625cd0