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2d99b58461
linux/drivers/net/phy/adin.c
Alexandru Ardelean 2d99b58461 net: phy: adin: implement downshift configuration via phy-tunable 
Down-speed auto-negotiation may not always be enabled, in which case the
PHY won't down-shift to 100 or 10 during auto-negotiation.

This change enables downshift and configures the number of retries to
default 4 (which is also in the datasheet

The downshift control mechanism can also be controlled via the phy-tunable
interface (ETHTOOL_PHY_DOWNSHIFT control).

The change has been adapted from the Aquantia PHY driver.

Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2019-08-16 11:56:26 -07:00

597 lines
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// SPDX-License-Identifier: GPL-2.0+
/**
* Driver for Analog Devices Industrial Ethernet PHYs
*
* Copyright 2019 Analog Devices Inc.
*/
#include <linux/kernel.h>
#include <linux/bitfield.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mii.h>
#include <linux/phy.h>
#include <linux/property.h>
#define PHY_ID_ADIN1200 0x0283bc20
#define PHY_ID_ADIN1300 0x0283bc30
#define ADIN1300_MII_EXT_REG_PTR 0x0010
#define ADIN1300_MII_EXT_REG_DATA 0x0011
#define ADIN1300_PHY_CTRL1 0x0012
#define ADIN1300_AUTO_MDI_EN BIT(10)
#define ADIN1300_MAN_MDIX_EN BIT(9)
#define ADIN1300_PHY_CTRL2 0x0016
#define ADIN1300_DOWNSPEED_AN_100_EN BIT(11)
#define ADIN1300_DOWNSPEED_AN_10_EN BIT(10)
#define ADIN1300_GROUP_MDIO_EN BIT(6)
#define ADIN1300_DOWNSPEEDS_EN \
(ADIN1300_DOWNSPEED_AN_100_EN | ADIN1300_DOWNSPEED_AN_10_EN)
#define ADIN1300_PHY_CTRL3 0x0017
#define ADIN1300_LINKING_EN BIT(13)
#define ADIN1300_DOWNSPEED_RETRIES_MSK GENMASK(12, 10)
#define ADIN1300_INT_MASK_REG 0x0018
#define ADIN1300_INT_MDIO_SYNC_EN BIT(9)
#define ADIN1300_INT_ANEG_STAT_CHNG_EN BIT(8)
#define ADIN1300_INT_ANEG_PAGE_RX_EN BIT(6)
#define ADIN1300_INT_IDLE_ERR_CNT_EN BIT(5)
#define ADIN1300_INT_MAC_FIFO_OU_EN BIT(4)
#define ADIN1300_INT_RX_STAT_CHNG_EN BIT(3)
#define ADIN1300_INT_LINK_STAT_CHNG_EN BIT(2)
#define ADIN1300_INT_SPEED_CHNG_EN BIT(1)
#define ADIN1300_INT_HW_IRQ_EN BIT(0)
#define ADIN1300_INT_MASK_EN \
(ADIN1300_INT_LINK_STAT_CHNG_EN | ADIN1300_INT_HW_IRQ_EN)
#define ADIN1300_INT_STATUS_REG 0x0019
#define ADIN1300_PHY_STATUS1 0x001a
#define ADIN1300_PAIR_01_SWAP BIT(11)
/* EEE register addresses, accessible via Clause 22 access using
* ADIN1300_MII_EXT_REG_PTR & ADIN1300_MII_EXT_REG_DATA.
* The bit-fields are the same as specified by IEEE for EEE.
*/
#define ADIN1300_EEE_CAP_REG 0x8000
#define ADIN1300_EEE_ADV_REG 0x8001
#define ADIN1300_EEE_LPABLE_REG 0x8002
#define ADIN1300_CLOCK_STOP_REG 0x9400
#define ADIN1300_LPI_WAKE_ERR_CNT_REG 0xa000
#define ADIN1300_GE_SOFT_RESET_REG 0xff0c
#define ADIN1300_GE_SOFT_RESET BIT(0)
#define ADIN1300_GE_RGMII_CFG_REG 0xff23
#define ADIN1300_GE_RGMII_RX_MSK GENMASK(8, 6)
#define ADIN1300_GE_RGMII_RX_SEL(x) \
FIELD_PREP(ADIN1300_GE_RGMII_RX_MSK, x)
#define ADIN1300_GE_RGMII_GTX_MSK GENMASK(5, 3)
#define ADIN1300_GE_RGMII_GTX_SEL(x) \
FIELD_PREP(ADIN1300_GE_RGMII_GTX_MSK, x)
#define ADIN1300_GE_RGMII_RXID_EN BIT(2)
#define ADIN1300_GE_RGMII_TXID_EN BIT(1)
#define ADIN1300_GE_RGMII_EN BIT(0)
/* RGMII internal delay settings for rx and tx for ADIN1300 */
#define ADIN1300_RGMII_1_60_NS 0x0001
#define ADIN1300_RGMII_1_80_NS 0x0002
#define ADIN1300_RGMII_2_00_NS 0x0000
#define ADIN1300_RGMII_2_20_NS 0x0006
#define ADIN1300_RGMII_2_40_NS 0x0007
#define ADIN1300_GE_RMII_CFG_REG 0xff24
#define ADIN1300_GE_RMII_FIFO_DEPTH_MSK GENMASK(6, 4)
#define ADIN1300_GE_RMII_FIFO_DEPTH_SEL(x) \
FIELD_PREP(ADIN1300_GE_RMII_FIFO_DEPTH_MSK, x)
#define ADIN1300_GE_RMII_EN BIT(0)
/* RMII fifo depth values */
#define ADIN1300_RMII_4_BITS 0x0000
#define ADIN1300_RMII_8_BITS 0x0001
#define ADIN1300_RMII_12_BITS 0x0002
#define ADIN1300_RMII_16_BITS 0x0003
#define ADIN1300_RMII_20_BITS 0x0004
#define ADIN1300_RMII_24_BITS 0x0005
/**
* struct adin_cfg_reg_map - map a config value to aregister value
* @cfg value in device configuration
* @reg value in the register
*/
struct adin_cfg_reg_map {
int cfg;
int reg;
};
static const struct adin_cfg_reg_map adin_rgmii_delays[] = {
{ 1600, ADIN1300_RGMII_1_60_NS },
{ 1800, ADIN1300_RGMII_1_80_NS },
{ 2000, ADIN1300_RGMII_2_00_NS },
{ 2200, ADIN1300_RGMII_2_20_NS },
{ 2400, ADIN1300_RGMII_2_40_NS },
{ },
};
static const struct adin_cfg_reg_map adin_rmii_fifo_depths[] = {
{ 4, ADIN1300_RMII_4_BITS },
{ 8, ADIN1300_RMII_8_BITS },
{ 12, ADIN1300_RMII_12_BITS },
{ 16, ADIN1300_RMII_16_BITS },
{ 20, ADIN1300_RMII_20_BITS },
{ 24, ADIN1300_RMII_24_BITS },
{ },
};
/**
* struct adin_clause45_mmd_map - map to convert Clause 45 regs to Clause 22
* @devad device address used in Clause 45 access
* @cl45_regnum register address defined by Clause 45
* @adin_regnum equivalent register address accessible via Clause 22
*/
struct adin_clause45_mmd_map {
int devad;
u16 cl45_regnum;
u16 adin_regnum;
};
static struct adin_clause45_mmd_map adin_clause45_mmd_map[] = {
{ MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE, ADIN1300_EEE_CAP_REG },
{ MDIO_MMD_AN, MDIO_AN_EEE_LPABLE, ADIN1300_EEE_LPABLE_REG },
{ MDIO_MMD_AN, MDIO_AN_EEE_ADV, ADIN1300_EEE_ADV_REG },
{ MDIO_MMD_PCS, MDIO_CTRL1, ADIN1300_CLOCK_STOP_REG },
{ MDIO_MMD_PCS, MDIO_PCS_EEE_WK_ERR, ADIN1300_LPI_WAKE_ERR_CNT_REG },
};
static int adin_lookup_reg_value(const struct adin_cfg_reg_map *tbl, int cfg)
{
size_t i;
for (i = 0; tbl[i].cfg; i++) {
if (tbl[i].cfg == cfg)
return tbl[i].reg;
}
return -EINVAL;
}
static u32 adin_get_reg_value(struct phy_device *phydev,
const char *prop_name,
const struct adin_cfg_reg_map *tbl,
u32 dflt)
{
struct device *dev = &phydev->mdio.dev;
u32 val;
int rc;
if (device_property_read_u32(dev, prop_name, &val))
return dflt;
rc = adin_lookup_reg_value(tbl, val);
if (rc < 0) {
phydev_warn(phydev,
"Unsupported value %u for %s using default (%u)\n",
val, prop_name, dflt);
return dflt;
}
return rc;
}
static int adin_config_rgmii_mode(struct phy_device *phydev)
{
u32 val;
int reg;
if (!phy_interface_is_rgmii(phydev))
return phy_clear_bits_mmd(phydev, MDIO_MMD_VEND1,
ADIN1300_GE_RGMII_CFG_REG,
ADIN1300_GE_RGMII_EN);
reg = phy_read_mmd(phydev, MDIO_MMD_VEND1, ADIN1300_GE_RGMII_CFG_REG);
if (reg < 0)
return reg;
reg |= ADIN1300_GE_RGMII_EN;
if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID ||
phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID) {
reg |= ADIN1300_GE_RGMII_RXID_EN;
val = adin_get_reg_value(phydev, "adi,rx-internal-delay-ps",
adin_rgmii_delays,
ADIN1300_RGMII_2_00_NS);
reg &= ~ADIN1300_GE_RGMII_RX_MSK;
reg |= ADIN1300_GE_RGMII_RX_SEL(val);
} else {
reg &= ~ADIN1300_GE_RGMII_RXID_EN;
}
if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID ||
phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID) {
reg |= ADIN1300_GE_RGMII_TXID_EN;
val = adin_get_reg_value(phydev, "adi,tx-internal-delay-ps",
adin_rgmii_delays,
ADIN1300_RGMII_2_00_NS);
reg &= ~ADIN1300_GE_RGMII_GTX_MSK;
reg |= ADIN1300_GE_RGMII_GTX_SEL(val);
} else {
reg &= ~ADIN1300_GE_RGMII_TXID_EN;
}
return phy_write_mmd(phydev, MDIO_MMD_VEND1,
ADIN1300_GE_RGMII_CFG_REG, reg);
}
static int adin_config_rmii_mode(struct phy_device *phydev)
{
u32 val;
int reg;
if (phydev->interface != PHY_INTERFACE_MODE_RMII)
return phy_clear_bits_mmd(phydev, MDIO_MMD_VEND1,
ADIN1300_GE_RMII_CFG_REG,
ADIN1300_GE_RMII_EN);
reg = phy_read_mmd(phydev, MDIO_MMD_VEND1, ADIN1300_GE_RMII_CFG_REG);
if (reg < 0)
return reg;
reg |= ADIN1300_GE_RMII_EN;
val = adin_get_reg_value(phydev, "adi,fifo-depth-bits",
adin_rmii_fifo_depths,
ADIN1300_RMII_8_BITS);
reg &= ~ADIN1300_GE_RMII_FIFO_DEPTH_MSK;
reg |= ADIN1300_GE_RMII_FIFO_DEPTH_SEL(val);
return phy_write_mmd(phydev, MDIO_MMD_VEND1,
ADIN1300_GE_RMII_CFG_REG, reg);
}
static int adin_get_downshift(struct phy_device *phydev, u8 *data)
{
int val, cnt, enable;
val = phy_read(phydev, ADIN1300_PHY_CTRL2);
if (val < 0)
return val;
cnt = phy_read(phydev, ADIN1300_PHY_CTRL3);
if (cnt < 0)
return cnt;
enable = FIELD_GET(ADIN1300_DOWNSPEEDS_EN, val);
cnt = FIELD_GET(ADIN1300_DOWNSPEED_RETRIES_MSK, cnt);
*data = (enable && cnt) ? cnt : DOWNSHIFT_DEV_DISABLE;
return 0;
}
static int adin_set_downshift(struct phy_device *phydev, u8 cnt)
{
u16 val;
int rc;
if (cnt == DOWNSHIFT_DEV_DISABLE)
return phy_clear_bits(phydev, ADIN1300_PHY_CTRL2,
ADIN1300_DOWNSPEEDS_EN);
if (cnt > 7)
return -E2BIG;
val = FIELD_PREP(ADIN1300_DOWNSPEED_RETRIES_MSK, cnt);
val |= ADIN1300_LINKING_EN;
rc = phy_modify(phydev, ADIN1300_PHY_CTRL3,
ADIN1300_LINKING_EN | ADIN1300_DOWNSPEED_RETRIES_MSK,
val);
if (rc < 0)
return rc;
return phy_set_bits(phydev, ADIN1300_PHY_CTRL2,
ADIN1300_DOWNSPEEDS_EN);
}
static int adin_get_tunable(struct phy_device *phydev,
struct ethtool_tunable *tuna, void *data)
{
switch (tuna->id) {
case ETHTOOL_PHY_DOWNSHIFT:
return adin_get_downshift(phydev, data);
default:
return -EOPNOTSUPP;
}
}
static int adin_set_tunable(struct phy_device *phydev,
struct ethtool_tunable *tuna, const void *data)
{
switch (tuna->id) {
case ETHTOOL_PHY_DOWNSHIFT:
return adin_set_downshift(phydev, *(const u8 *)data);
default:
return -EOPNOTSUPP;
}
}
static int adin_config_init(struct phy_device *phydev)
{
int rc;
phydev->mdix_ctrl = ETH_TP_MDI_AUTO;
rc = genphy_config_init(phydev);
if (rc < 0)
return rc;
rc = adin_config_rgmii_mode(phydev);
if (rc < 0)
return rc;
rc = adin_config_rmii_mode(phydev);
if (rc < 0)
return rc;
rc = adin_set_downshift(phydev, 4);
if (rc < 0)
return rc;
phydev_dbg(phydev, "PHY is using mode '%s'\n",
phy_modes(phydev->interface));
return 0;
}
static int adin_phy_ack_intr(struct phy_device *phydev)
{
/* Clear pending interrupts */
int rc = phy_read(phydev, ADIN1300_INT_STATUS_REG);
return rc < 0 ? rc : 0;
}
static int adin_phy_config_intr(struct phy_device *phydev)
{
if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
return phy_set_bits(phydev, ADIN1300_INT_MASK_REG,
ADIN1300_INT_MASK_EN);
return phy_clear_bits(phydev, ADIN1300_INT_MASK_REG,
ADIN1300_INT_MASK_EN);
}
static int adin_cl45_to_adin_reg(struct phy_device *phydev, int devad,
u16 cl45_regnum)
{
struct adin_clause45_mmd_map *m;
int i;
if (devad == MDIO_MMD_VEND1)
return cl45_regnum;
for (i = 0; i < ARRAY_SIZE(adin_clause45_mmd_map); i++) {
m = &adin_clause45_mmd_map[i];
if (m->devad == devad && m->cl45_regnum == cl45_regnum)
return m->adin_regnum;
}
phydev_err(phydev,
"No translation available for devad: %d reg: %04x\n",
devad, cl45_regnum);
return -EINVAL;
}
static int adin_read_mmd(struct phy_device *phydev, int devad, u16 regnum)
{
struct mii_bus *bus = phydev->mdio.bus;
int phy_addr = phydev->mdio.addr;
int adin_regnum;
int err;
adin_regnum = adin_cl45_to_adin_reg(phydev, devad, regnum);
if (adin_regnum < 0)
return adin_regnum;
err = __mdiobus_write(bus, phy_addr, ADIN1300_MII_EXT_REG_PTR,
adin_regnum);
if (err)
return err;
return __mdiobus_read(bus, phy_addr, ADIN1300_MII_EXT_REG_DATA);
}
static int adin_write_mmd(struct phy_device *phydev, int devad, u16 regnum,
u16 val)
{
struct mii_bus *bus = phydev->mdio.bus;
int phy_addr = phydev->mdio.addr;
int adin_regnum;
int err;
adin_regnum = adin_cl45_to_adin_reg(phydev, devad, regnum);
if (adin_regnum < 0)
return adin_regnum;
err = __mdiobus_write(bus, phy_addr, ADIN1300_MII_EXT_REG_PTR,
adin_regnum);
if (err)
return err;
return __mdiobus_write(bus, phy_addr, ADIN1300_MII_EXT_REG_DATA, val);
}
static int adin_config_mdix(struct phy_device *phydev)
{
bool auto_en, mdix_en;
int reg;
mdix_en = false;
auto_en = false;
switch (phydev->mdix_ctrl) {
case ETH_TP_MDI:
break;
case ETH_TP_MDI_X:
mdix_en = true;
break;
case ETH_TP_MDI_AUTO:
auto_en = true;
break;
default:
return -EINVAL;
}
reg = phy_read(phydev, ADIN1300_PHY_CTRL1);
if (reg < 0)
return reg;
if (mdix_en)
reg |= ADIN1300_MAN_MDIX_EN;
else
reg &= ~ADIN1300_MAN_MDIX_EN;
if (auto_en)
reg |= ADIN1300_AUTO_MDI_EN;
else
reg &= ~ADIN1300_AUTO_MDI_EN;
return phy_write(phydev, ADIN1300_PHY_CTRL1, reg);
}
static int adin_config_aneg(struct phy_device *phydev)
{
int ret;
ret = adin_config_mdix(phydev);
if (ret)
return ret;
return genphy_config_aneg(phydev);
}
static int adin_mdix_update(struct phy_device *phydev)
{
bool auto_en, mdix_en;
bool swapped;
int reg;
reg = phy_read(phydev, ADIN1300_PHY_CTRL1);
if (reg < 0)
return reg;
auto_en = !!(reg & ADIN1300_AUTO_MDI_EN);
mdix_en = !!(reg & ADIN1300_MAN_MDIX_EN);
/* If MDI/MDIX is forced, just read it from the control reg */
if (!auto_en) {
if (mdix_en)
phydev->mdix = ETH_TP_MDI_X;
else
phydev->mdix = ETH_TP_MDI;
return 0;
}
/**
* Otherwise, we need to deduce it from the PHY status2 reg.
* When Auto-MDI is enabled, the ADIN1300_MAN_MDIX_EN bit implies
* a preference for MDIX when it is set.
*/
reg = phy_read(phydev, ADIN1300_PHY_STATUS1);
if (reg < 0)
return reg;
swapped = !!(reg & ADIN1300_PAIR_01_SWAP);
if (mdix_en != swapped)
phydev->mdix = ETH_TP_MDI_X;
else
phydev->mdix = ETH_TP_MDI;
return 0;
}
static int adin_read_status(struct phy_device *phydev)
{
int ret;
ret = adin_mdix_update(phydev);
if (ret < 0)
return ret;
return genphy_read_status(phydev);
}
static int adin_soft_reset(struct phy_device *phydev)
{
int rc;
/* The reset bit is self-clearing, set it and wait */
rc = phy_set_bits_mmd(phydev, MDIO_MMD_VEND1,
ADIN1300_GE_SOFT_RESET_REG,
ADIN1300_GE_SOFT_RESET);
if (rc < 0)
return rc;
msleep(10);
/* If we get a read error something may be wrong */
rc = phy_read_mmd(phydev, MDIO_MMD_VEND1,
ADIN1300_GE_SOFT_RESET_REG);
return rc < 0 ? rc : 0;
}
static struct phy_driver adin_driver[] = {
{
PHY_ID_MATCH_MODEL(PHY_ID_ADIN1200),
.name = "ADIN1200",
.config_init = adin_config_init,
.soft_reset = adin_soft_reset,
.config_aneg = adin_config_aneg,
.read_status = adin_read_status,
.get_tunable = adin_get_tunable,
.set_tunable = adin_set_tunable,
.ack_interrupt = adin_phy_ack_intr,
.config_intr = adin_phy_config_intr,
.resume = genphy_resume,
.suspend = genphy_suspend,
.read_mmd = adin_read_mmd,
.write_mmd = adin_write_mmd,
},
{
PHY_ID_MATCH_MODEL(PHY_ID_ADIN1300),
.name = "ADIN1300",
.config_init = adin_config_init,
.soft_reset = adin_soft_reset,
.config_aneg = adin_config_aneg,
.read_status = adin_read_status,
.get_tunable = adin_get_tunable,
.set_tunable = adin_set_tunable,
.ack_interrupt = adin_phy_ack_intr,
.config_intr = adin_phy_config_intr,
.resume = genphy_resume,
.suspend = genphy_suspend,
.read_mmd = adin_read_mmd,
.write_mmd = adin_write_mmd,
},
};
module_phy_driver(adin_driver);
static struct mdio_device_id __maybe_unused adin_tbl[] = {
{ PHY_ID_MATCH_MODEL(PHY_ID_ADIN1200) },
{ PHY_ID_MATCH_MODEL(PHY_ID_ADIN1300) },
{ }
};
MODULE_DEVICE_TABLE(mdio, adin_tbl);
MODULE_DESCRIPTION("Analog Devices Industrial Ethernet PHY driver");
MODULE_LICENSE("GPL");
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