1 /* 2 * Marvell 88E6xxx SERDES manipulation, via SMI bus 3 * 4 * Copyright (c) 2008 Marvell Semiconductor 5 * 6 * Copyright (c) 2017 Andrew Lunn <andrew@lunn.ch> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 */ 13 14 #include <linux/mii.h> 15 16 #include "mv88e6xxx.h" 17 #include "phy.h" 18 #include "port.h" 19 #include "serdes.h" 20 21 static int mv88e6352_serdes_read(struct mv88e6xxx_chip *chip, int reg, 22 u16 *val) 23 { 24 return mv88e6xxx_phy_page_read(chip, MV88E6352_ADDR_SERDES, 25 MV88E6352_SERDES_PAGE_FIBER, 26 reg, val); 27 } 28 29 static int mv88e6352_serdes_write(struct mv88e6xxx_chip *chip, int reg, 30 u16 val) 31 { 32 return mv88e6xxx_phy_page_write(chip, MV88E6352_ADDR_SERDES, 33 MV88E6352_SERDES_PAGE_FIBER, 34 reg, val); 35 } 36 37 static int mv88e6352_serdes_power_set(struct mv88e6xxx_chip *chip, bool on) 38 { 39 u16 val, new_val; 40 int err; 41 42 err = mv88e6352_serdes_read(chip, MII_BMCR, &val); 43 if (err) 44 return err; 45 46 if (on) 47 new_val = val & ~BMCR_PDOWN; 48 else 49 new_val = val | BMCR_PDOWN; 50 51 if (val != new_val) 52 err = mv88e6352_serdes_write(chip, MII_BMCR, new_val); 53 54 return err; 55 } 56 57 int mv88e6352_serdes_power(struct mv88e6xxx_chip *chip, int port, bool on) 58 { 59 int err; 60 u8 cmode; 61 62 err = mv88e6xxx_port_get_cmode(chip, port, &cmode); 63 if (err) 64 return err; 65 66 if ((cmode == PORT_STATUS_CMODE_100BASE_X) || 67 (cmode == PORT_STATUS_CMODE_1000BASE_X) || 68 (cmode == PORT_STATUS_CMODE_SGMII)) { 69 err = mv88e6352_serdes_power_set(chip, on); 70 if (err < 0) 71 return err; 72 } 73 74 return 0; 75 } 76