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u-boot/drivers/net/phy/dp83867.c
Michal Simek a7844953ac 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.

Patch description, dt flags have been done in mainline Linux by
commit a2111c460c0c ("net: phy: dp83867: Add documentation for SGMII mode type")
and by commit 507ddd5c0d47 ("net: phy: dp83867: Add SGMII mode type switching")

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
2020-03-09 18:11:25 -05:00

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// SPDX-License-Identifier: GPL-2.0
/*
* TI PHY drivers
*
*/
#include <common.h>
#include <phy.h>
#include <dm/devres.h>
#include <linux/compat.h>
#include <malloc.h>
#include <dm.h>
#include <dt-bindings/net/ti-dp83867.h>
/* TI DP83867 */
#define DP83867_DEVADDR 0x1f
#define MII_DP83867_PHYCTRL 0x10
#define MII_DP83867_MICR 0x12
#define MII_DP83867_CFG2 0x14
#define MII_DP83867_BISCR 0x16
#define DP83867_CTRL 0x1f
/* Extended Registers */
#define DP83867_CFG4 0x0031
#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_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)
/* 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_MASK GENMASK(15, 14)
#define DP83867_PHYCR_RESERVED_MASK BIT(11)
#define DP83867_PHYCR_FORCE_LINK_GOOD BIT(10)
#define DP83867_MDI_CROSSOVER 5
#define DP83867_MDI_CROSSOVER_MDIX 2
#define DP83867_PHYCTRL_SGMIIEN 0x0800
#define DP83867_PHYCTRL_RXFIFO_SHIFT 12
#define DP83867_PHYCTRL_TXFIFO_SHIFT 14
/* 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
/* CFG2 bits */
#define MII_DP83867_CFG2_SPEEDOPT_10EN 0x0040
#define MII_DP83867_CFG2_SGMII_AUTONEGEN 0x0080
#define MII_DP83867_CFG2_SPEEDOPT_ENH 0x0100
#define MII_DP83867_CFG2_SPEEDOPT_CNT 0x0800
#define MII_DP83867_CFG2_SPEEDOPT_INTLOW 0x2000
#define MII_DP83867_CFG2_MASK 0x003F
/* User setting - can be taken from DTS */
#define DEFAULT_FIFO_DEPTH DP83867_PHYCR_FIFO_DEPTH_4_B_NIB
/* IO_MUX_CFG bits */
#define DP83867_IO_MUX_CFG_IO_IMPEDANCE_CTRL 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_SHIFT 8
#define DP83867_IO_MUX_CFG_CLK_O_SEL_MASK \
GENMASK(0x1f, DP83867_IO_MUX_CFG_CLK_O_SEL_SHIFT)
/* CFG4 bits */
#define DP83867_CFG4_PORT_MIRROR_EN BIT(0)
/* SGMIICTL bits */
#define DP83867_SGMII_TYPE BIT(14)
enum {
DP83867_PORT_MIRRORING_KEEP,
DP83867_PORT_MIRRORING_EN,
DP83867_PORT_MIRRORING_DIS,
};
struct dp83867_private {
u32 rx_id_delay;
u32 tx_id_delay;
int fifo_depth;
int io_impedance;
bool rxctrl_strap_quirk;
int port_mirroring;
bool set_clk_output;
unsigned int clk_output_sel;
bool sgmii_ref_clk_en;
};
static int dp83867_config_port_mirroring(struct phy_device *phydev)
{
struct dp83867_private *dp83867 =
(struct dp83867_private *)phydev->priv;
u16 val;
val = phy_read_mmd(phydev, DP83867_DEVADDR, DP83867_CFG4);
if (dp83867->port_mirroring == DP83867_PORT_MIRRORING_EN)
val |= DP83867_CFG4_PORT_MIRROR_EN;
else
val &= ~DP83867_CFG4_PORT_MIRROR_EN;
phy_write_mmd(phydev, DP83867_DEVADDR, DP83867_CFG4, val);
return 0;
}
#if defined(CONFIG_DM_ETH)
/**
* dp83867_data_init - Convenience function for setting PHY specific data
*
* @phydev: the phy_device struct
*/
static int dp83867_of_init(struct phy_device *phydev)
{
struct dp83867_private *dp83867 = phydev->priv;
ofnode node;
int ret;
node = phy_get_ofnode(phydev);
if (!ofnode_valid(node))
return -EINVAL;
/* Optional configuration */
ret = ofnode_read_u32(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) {
pr_debug("ti,clk-output-sel value %u out of range\n",
dp83867->clk_output_sel);
return -EINVAL;
}
}
if (ofnode_read_bool(node, "ti,max-output-impedance"))
dp83867->io_impedance = DP83867_IO_MUX_CFG_IO_IMPEDANCE_MAX;
else if (ofnode_read_bool(node, "ti,min-output-impedance"))
dp83867->io_impedance = DP83867_IO_MUX_CFG_IO_IMPEDANCE_MIN;
else
dp83867->io_impedance = -EINVAL;
if (ofnode_read_bool(node, "ti,dp83867-rxctrl-strap-quirk"))
dp83867->rxctrl_strap_quirk = true;
/* 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) {
u16 val = phy_read_mmd(phydev, DP83867_DEVADDR,
DP83867_STRAP_STS2);
u16 txskew = (val & DP83867_STRAP_STS2_CLK_SKEW_TX_MASK) >>
DP83867_STRAP_STS2_CLK_SKEW_TX_SHIFT;
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)
pr_warn("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 = ofnode_read_u32(node, "ti,rx-internal-delay",
&dp83867->rx_id_delay);
if (ret) {
pr_debug("ti,rx-internal-delay must be specified\n");
return ret;
}
if (dp83867->rx_id_delay > DP83867_RGMII_RX_CLK_DELAY_MAX) {
pr_debug("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 = ofnode_read_u32(node, "ti,tx-internal-delay",
&dp83867->tx_id_delay);
if (ret) {
debug("ti,tx-internal-delay must be specified\n");
return ret;
}
if (dp83867->tx_id_delay > DP83867_RGMII_TX_CLK_DELAY_MAX) {
pr_debug("ti,tx-internal-delay value of %u out of range\n",
dp83867->tx_id_delay);
return -EINVAL;
}
}
dp83867->fifo_depth = ofnode_read_u32_default(node, "ti,fifo-depth",
DEFAULT_FIFO_DEPTH);
if (ofnode_read_bool(node, "enet-phy-lane-swap"))
dp83867->port_mirroring = DP83867_PORT_MIRRORING_EN;
if (ofnode_read_bool(node, "enet-phy-lane-no-swap"))
dp83867->port_mirroring = DP83867_PORT_MIRRORING_DIS;
if (ofnode_read_bool(node, "ti,sgmii-ref-clock-output-enable"))
dp83867->sgmii_ref_clk_en = true;
return 0;
}
#else
static int dp83867_of_init(struct phy_device *phydev)
{
struct dp83867_private *dp83867 = phydev->priv;
dp83867->rx_id_delay = DP83867_RGMIIDCTL_2_25_NS;
dp83867->tx_id_delay = DP83867_RGMIIDCTL_2_75_NS;
dp83867->fifo_depth = DEFAULT_FIFO_DEPTH;
dp83867->io_impedance = -EINVAL;
return 0;
}
#endif
static int dp83867_config(struct phy_device *phydev)
{
struct dp83867_private *dp83867;
unsigned int val, delay, cfg2;
int ret, bs;
dp83867 = (struct dp83867_private *)phydev->priv;
ret = dp83867_of_init(phydev);
if (ret)
return ret;
/* Restart the PHY. */
val = phy_read(phydev, MDIO_DEVAD_NONE, DP83867_CTRL);
phy_write(phydev, MDIO_DEVAD_NONE, DP83867_CTRL,
val | DP83867_SW_RESTART);
/* Mode 1 or 2 workaround */
if (dp83867->rxctrl_strap_quirk) {
val = phy_read_mmd(phydev, DP83867_DEVADDR,
DP83867_CFG4);
val &= ~BIT(7);
phy_write_mmd(phydev, DP83867_DEVADDR,
DP83867_CFG4, val);
}
if (phy_interface_is_rgmii(phydev)) {
val = phy_read(phydev, MDIO_DEVAD_NONE, MII_DP83867_PHYCTRL);
if (val < 0)
goto err_out;
val &= ~DP83867_PHYCR_FIFO_DEPTH_MASK;
val |= (dp83867->fifo_depth << DP83867_PHYCR_FIFO_DEPTH_SHIFT);
/* Do not force link good */
val &= ~DP83867_PHYCR_FORCE_LINK_GOOD;
/* 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, MDIO_DEVAD_NONE,
MII_DP83867_PHYCTRL, val);
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 (phy_interface_is_sgmii(phydev)) {
if (dp83867->sgmii_ref_clk_en)
phy_write_mmd(phydev, DP83867_DEVADDR, DP83867_SGMIICTL,
DP83867_SGMII_TYPE);
phy_write(phydev, MDIO_DEVAD_NONE, MII_BMCR,
(BMCR_ANENABLE | BMCR_FULLDPLX | BMCR_SPEED1000));
cfg2 = phy_read(phydev, phydev->addr, MII_DP83867_CFG2);
cfg2 &= MII_DP83867_CFG2_MASK;
cfg2 |= (MII_DP83867_CFG2_SPEEDOPT_10EN |
MII_DP83867_CFG2_SGMII_AUTONEGEN |
MII_DP83867_CFG2_SPEEDOPT_ENH |
MII_DP83867_CFG2_SPEEDOPT_CNT |
MII_DP83867_CFG2_SPEEDOPT_INTLOW);
phy_write(phydev, MDIO_DEVAD_NONE, MII_DP83867_CFG2, cfg2);
phy_write_mmd(phydev, DP83867_DEVADDR,
DP83867_RGMIICTL, 0x0);
phy_write(phydev, MDIO_DEVAD_NONE, MII_DP83867_PHYCTRL,
DP83867_PHYCTRL_SGMIIEN |
(DP83867_MDI_CROSSOVER_MDIX <<
DP83867_MDI_CROSSOVER) |
(dp83867->fifo_depth << DP83867_PHYCTRL_RXFIFO_SHIFT) |
(dp83867->fifo_depth << DP83867_PHYCTRL_TXFIFO_SHIFT));
phy_write(phydev, MDIO_DEVAD_NONE, MII_DP83867_BISCR, 0x0);
}
if (dp83867->io_impedance >= 0) {
val = phy_read_mmd(phydev,
DP83867_DEVADDR,
DP83867_IO_MUX_CFG);
val &= ~DP83867_IO_MUX_CFG_IO_IMPEDANCE_CTRL;
val |= dp83867->io_impedance &
DP83867_IO_MUX_CFG_IO_IMPEDANCE_CTRL;
phy_write_mmd(phydev, DP83867_DEVADDR,
DP83867_IO_MUX_CFG, val);
}
if (dp83867->port_mirroring != DP83867_PORT_MIRRORING_KEEP)
dp83867_config_port_mirroring(phydev);
/* Clock output selection if muxing property is set */
if (dp83867->set_clk_output) {
val = phy_read_mmd(phydev, DP83867_DEVADDR,
DP83867_IO_MUX_CFG);
if (dp83867->clk_output_sel == DP83867_CLK_O_SEL_OFF) {
val |= DP83867_IO_MUX_CFG_CLK_O_DISABLE;
} else {
val &= ~(DP83867_IO_MUX_CFG_CLK_O_SEL_MASK |
DP83867_IO_MUX_CFG_CLK_O_DISABLE);
val |= dp83867->clk_output_sel <<
DP83867_IO_MUX_CFG_CLK_O_SEL_SHIFT;
}
phy_write_mmd(phydev, DP83867_DEVADDR,
DP83867_IO_MUX_CFG, val);
}
genphy_config_aneg(phydev);
return 0;
err_out:
return ret;
}
static int dp83867_probe(struct phy_device *phydev)
{
struct dp83867_private *dp83867;
dp83867 = kzalloc(sizeof(*dp83867), GFP_KERNEL);
if (!dp83867)
return -ENOMEM;
phydev->priv = dp83867;
return 0;
}
static struct phy_driver DP83867_driver = {
.name = "TI DP83867",
.uid = 0x2000a231,
.mask = 0xfffffff0,
.features = PHY_GBIT_FEATURES,
.probe = dp83867_probe,
.config = &dp83867_config,
.startup = &genphy_startup,
.shutdown = &genphy_shutdown,
};
int phy_ti_init(void)
{
phy_register(&DP83867_driver);
return 0;
}
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