diff options
Diffstat (limited to 'drivers/net/pcs/pcs-xpcs-nxp.c')
| -rw-r--r-- | drivers/net/pcs/pcs-xpcs-nxp.c | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/drivers/net/pcs/pcs-xpcs-nxp.c b/drivers/net/pcs/pcs-xpcs-nxp.c new file mode 100644 index 000000000000..984c9f7f16a8 --- /dev/null +++ b/drivers/net/pcs/pcs-xpcs-nxp.c @@ -0,0 +1,185 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright 2021 NXP Semiconductors + */ +#include <linux/pcs/pcs-xpcs.h> +#include "pcs-xpcs.h" + +/* LANE_DRIVER1_0 register */ +#define SJA1110_LANE_DRIVER1_0 0x8038 +#define SJA1110_TXDRV(x) (((x) << 12) & GENMASK(14, 12)) + +/* LANE_DRIVER2_0 register */ +#define SJA1110_LANE_DRIVER2_0 0x803a +#define SJA1110_TXDRVTRIM_LSB(x) ((x) & GENMASK_ULL(15, 0)) + +/* LANE_DRIVER2_1 register */ +#define SJA1110_LANE_DRIVER2_1 0x803b +#define SJA1110_LANE_DRIVER2_1_RSV BIT(9) +#define SJA1110_TXDRVTRIM_MSB(x) (((x) & GENMASK_ULL(23, 16)) >> 16) + +/* LANE_TRIM register */ +#define SJA1110_LANE_TRIM 0x8040 +#define SJA1110_TXTEN BIT(11) +#define SJA1110_TXRTRIM(x) (((x) << 8) & GENMASK(10, 8)) +#define SJA1110_TXPLL_BWSEL BIT(7) +#define SJA1110_RXTEN BIT(6) +#define SJA1110_RXRTRIM(x) (((x) << 3) & GENMASK(5, 3)) +#define SJA1110_CDR_GAIN BIT(2) +#define SJA1110_ACCOUPLE_RXVCM_EN BIT(0) + +/* LANE_DATAPATH_1 register */ +#define SJA1110_LANE_DATAPATH_1 0x8037 + +/* POWERDOWN_ENABLE register */ +#define SJA1110_POWERDOWN_ENABLE 0x8041 +#define SJA1110_TXPLL_PD BIT(12) +#define SJA1110_TXPD BIT(11) +#define SJA1110_RXPKDETEN BIT(10) +#define SJA1110_RXCH_PD BIT(9) +#define SJA1110_RXBIAS_PD BIT(8) +#define SJA1110_RESET_SER_EN BIT(7) +#define SJA1110_RESET_SER BIT(6) +#define SJA1110_RESET_DES BIT(5) +#define SJA1110_RCVEN BIT(4) + +/* RXPLL_CTRL0 register */ +#define SJA1110_RXPLL_CTRL0 0x8065 +#define SJA1110_RXPLL_FBDIV(x) (((x) << 2) & GENMASK(9, 2)) + +/* RXPLL_CTRL1 register */ +#define SJA1110_RXPLL_CTRL1 0x8066 +#define SJA1110_RXPLL_REFDIV(x) ((x) & GENMASK(4, 0)) + +/* TXPLL_CTRL0 register */ +#define SJA1110_TXPLL_CTRL0 0x806d +#define SJA1110_TXPLL_FBDIV(x) ((x) & GENMASK(11, 0)) + +/* TXPLL_CTRL1 register */ +#define SJA1110_TXPLL_CTRL1 0x806e +#define SJA1110_TXPLL_REFDIV(x) ((x) & GENMASK(5, 0)) + +/* RX_DATA_DETECT register */ +#define SJA1110_RX_DATA_DETECT 0x8045 + +/* RX_CDR_CTLE register */ +#define SJA1110_RX_CDR_CTLE 0x8042 + +/* In NXP SJA1105, the PCS is integrated with a PMA that has the TX lane + * polarity inverted by default (PLUS is MINUS, MINUS is PLUS). To obtain + * normal non-inverted behavior, the TX lane polarity must be inverted in the + * PCS, via the DIGITAL_CONTROL_2 register. + */ +int nxp_sja1105_sgmii_pma_config(struct dw_xpcs *xpcs) +{ + return xpcs_write(xpcs, MDIO_MMD_VEND2, DW_VR_MII_DIG_CTRL2, + DW_VR_MII_DIG_CTRL2_TX_POL_INV); +} + +static int nxp_sja1110_pma_config(struct dw_xpcs *xpcs, + u16 txpll_fbdiv, u16 txpll_refdiv, + u16 rxpll_fbdiv, u16 rxpll_refdiv, + u16 rx_cdr_ctle) +{ + u16 val; + int ret; + + /* Program TX PLL feedback divider and reference divider settings for + * correct oscillation frequency. + */ + ret = xpcs_write(xpcs, MDIO_MMD_VEND2, SJA1110_TXPLL_CTRL0, + SJA1110_TXPLL_FBDIV(txpll_fbdiv)); + if (ret < 0) + return ret; + + ret = xpcs_write(xpcs, MDIO_MMD_VEND2, SJA1110_TXPLL_CTRL1, + SJA1110_TXPLL_REFDIV(txpll_refdiv)); + if (ret < 0) + return ret; + + /* Program transmitter amplitude and disable amplitude trimming */ + ret = xpcs_write(xpcs, MDIO_MMD_VEND2, SJA1110_LANE_DRIVER1_0, + SJA1110_TXDRV(0x5)); + if (ret < 0) + return ret; + + val = SJA1110_TXDRVTRIM_LSB(0xffffffull); + + ret = xpcs_write(xpcs, MDIO_MMD_VEND2, SJA1110_LANE_DRIVER2_0, val); + if (ret < 0) + return ret; + + val = SJA1110_TXDRVTRIM_MSB(0xffffffull) | SJA1110_LANE_DRIVER2_1_RSV; + + ret = xpcs_write(xpcs, MDIO_MMD_VEND2, SJA1110_LANE_DRIVER2_1, val); + if (ret < 0) + return ret; + + /* Enable input and output resistor terminations for low BER. */ + val = SJA1110_ACCOUPLE_RXVCM_EN | SJA1110_CDR_GAIN | + SJA1110_RXRTRIM(4) | SJA1110_RXTEN | SJA1110_TXPLL_BWSEL | + SJA1110_TXRTRIM(3) | SJA1110_TXTEN; + + ret = xpcs_write(xpcs, MDIO_MMD_VEND2, SJA1110_LANE_TRIM, val); + if (ret < 0) + return ret; + + /* Select PCS as transmitter data source. */ + ret = xpcs_write(xpcs, MDIO_MMD_VEND2, SJA1110_LANE_DATAPATH_1, 0); + if (ret < 0) + return ret; + + /* Program RX PLL feedback divider and reference divider for correct + * oscillation frequency. + */ + ret = xpcs_write(xpcs, MDIO_MMD_VEND2, SJA1110_RXPLL_CTRL0, + SJA1110_RXPLL_FBDIV(rxpll_fbdiv)); + if (ret < 0) + return ret; + + ret = xpcs_write(xpcs, MDIO_MMD_VEND2, SJA1110_RXPLL_CTRL1, + SJA1110_RXPLL_REFDIV(rxpll_refdiv)); + if (ret < 0) + return ret; + + /* Program threshold for receiver signal detector. + * Enable control of RXPLL by receiver signal detector to disable RXPLL + * when an input signal is not present. + */ + ret = xpcs_write(xpcs, MDIO_MMD_VEND2, SJA1110_RX_DATA_DETECT, 0x0005); + if (ret < 0) + return ret; + + /* Enable TX and RX PLLs and circuits. + * Release reset of PMA to enable data flow to/from PCS. + */ + ret = xpcs_read(xpcs, MDIO_MMD_VEND2, SJA1110_POWERDOWN_ENABLE); + if (ret < 0) + return ret; + + val = ret & ~(SJA1110_TXPLL_PD | SJA1110_TXPD | SJA1110_RXCH_PD | + SJA1110_RXBIAS_PD | SJA1110_RESET_SER_EN | + SJA1110_RESET_SER | SJA1110_RESET_DES); + val |= SJA1110_RXPKDETEN | SJA1110_RCVEN; + + ret = xpcs_write(xpcs, MDIO_MMD_VEND2, SJA1110_POWERDOWN_ENABLE, val); + if (ret < 0) + return ret; + + /* Program continuous-time linear equalizer (CTLE) settings. */ + ret = xpcs_write(xpcs, MDIO_MMD_VEND2, SJA1110_RX_CDR_CTLE, + rx_cdr_ctle); + if (ret < 0) + return ret; + + return 0; +} + +int nxp_sja1110_sgmii_pma_config(struct dw_xpcs *xpcs) +{ + return nxp_sja1110_pma_config(xpcs, 0x19, 0x1, 0x19, 0x1, 0x212a); +} + +int nxp_sja1110_2500basex_pma_config(struct dw_xpcs *xpcs) +{ + return nxp_sja1110_pma_config(xpcs, 0x7d, 0x2, 0x7d, 0x2, 0x732a); +} |