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linux_dsm_epyc7002/drivers/net/phy/dp83867.c
Vitaly Gaiduk 507ddd5c0d net: phy: dp83867: Add SGMII mode type switching 
This patch adds ability to switch beetween two PHY SGMII modes.
Some hardware, for example, FPGA IP designs may use 6-wire mode
which enables differential SGMII clock to MAC.

Signed-off-by: Vitaly Gaiduk <vitaly.gaiduk@cloudbear.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
2019-09-11 23:37:35 +01:00

486 lines
14 KiB
C
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// 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 <dt-bindings/net/ti-dp83867.h>
#define DP83867_PHY_ID 0x2000a231
#define DP83867_DEVADDR 0x1f
#define MII_DP83867_PHYCTRL 0x10
#define MII_DP83867_MICR 0x12
#define MII_DP83867_ISR 0x13
#define DP83867_CTRL 0x1f
#define DP83867_CFG3 0x1e
/* Extended Registers */
#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_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)
/* 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)
/* PHY CTRL bits */
#define DP83867_PHYCR_FIFO_DEPTH_SHIFT 14
#define DP83867_PHYCR_FIFO_DEPTH_MAX 0x03
#define DP83867_PHYCR_FIFO_DEPTH_MASK GENMASK(15, 14)
#define DP83867_PHYCR_RESERVED_MASK BIT(11)
/* RGMIIDCTL bits */
#define DP83867_RGMII_TX_CLK_DELAY_MAX 0xf
#define DP83867_RGMII_TX_CLK_DELAY_SHIFT 4
#define DP83867_RGMII_RX_CLK_DELAY_MAX 0xf
#define DP83867_RGMII_RX_CLK_DELAY_SHIFT 0
/* 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
/* CFG4 bits */
#define DP83867_CFG4_PORT_MIRROR_EN BIT(0)
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 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_config_intr(struct phy_device *phydev)
{
int micr_status;
if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
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);
return phy_write(phydev, MII_DP83867_MICR, micr_status);
}
micr_status = 0x0;
return phy_write(phydev, MII_DP83867_MICR, micr_status);
}
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;
}
#ifdef CONFIG_OF_MDIO
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;
}
}
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 */
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");
/* 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\n");
}
/* 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) {
ret = of_property_read_u32(of_node, "ti,rx-internal-delay",
&dp83867->rx_id_delay);
if (ret) {
phydev_err(phydev, "ti,rx-internal-delay must be specified\n");
return ret;
}
if (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;
}
}
/* TX 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_TXID) {
ret = of_property_read_u32(of_node, "ti,tx-internal-delay",
&dp83867->tx_id_delay);
if (ret) {
phydev_err(phydev, "ti,tx-internal-delay must be specified\n");
return ret;
}
if (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->fifo_depth);
if (ret) {
phydev_err(phydev,
"ti,fifo-depth property is required\n");
return ret;
}
if (dp83867->fifo_depth > DP83867_PHYCR_FIFO_DEPTH_MAX) {
phydev_err(phydev,
"ti,fifo-depth value %u out of range\n",
dp83867->fifo_depth);
return -EINVAL;
}
return 0;
}
#else
static int dp83867_of_init(struct phy_device *phydev)
{
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 0;
}
static int dp83867_config_init(struct phy_device *phydev)
{
struct dp83867_private *dp83867 = phydev->priv;
int ret, val, bs;
u16 delay;
ret = dp83867_of_init(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));
if (phy_interface_is_rgmii(phydev)) {
val = phy_read(phydev, MII_DP83867_PHYCTRL);
if (val < 0)
return val;
val &= ~DP83867_PHYCR_FIFO_DEPTH_MASK;
val |= (dp83867->fifo_depth << DP83867_PHYCR_FIFO_DEPTH_SHIFT);
/* 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 = (dp83867->rx_id_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);
}
/* Enable Interrupt output INT_OE in CFG3 register */
if (phy_interrupt_is_valid(phydev)) {
val = phy_read(phydev, DP83867_CFG3);
val |= BIT(7);
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);
return 0;
}
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,
/* IRQ related */
.ack_interrupt = dp83867_ack_interrupt,
.config_intr = dp83867_config_intr,
.suspend = genphy_suspend,
.resume = genphy_resume,
},
};
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");
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