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28ae1e9662
The AVB is not an indirect table using an Update bit, but a unit using a Busy bit. This means that we must ensure that this bit is cleared before setting it and wait until it gets cleared again after writing an operation. Reflect that. Signed-off-by: Vivien Didelot <vivien.didelot@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
239 lines
6.4 KiB
C
239 lines
6.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Marvell 88E6xxx Switch Global 2 Registers support
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*
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* Copyright (c) 2008 Marvell Semiconductor
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*
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* Copyright (c) 2016-2017 Savoir-faire Linux Inc.
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* Vivien Didelot <vivien.didelot@savoirfairelinux.com>
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*
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* Copyright (c) 2017 National Instruments
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* Brandon Streiff <brandon.streiff@ni.com>
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*/
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#include <linux/bitfield.h>
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#include "global2.h"
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/* Offset 0x16: AVB Command Register
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* Offset 0x17: AVB Data Register
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*
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* There are two different versions of this register interface:
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* "6352": 3-bit "op" field, 4-bit "port" field.
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* "6390": 2-bit "op" field, 5-bit "port" field.
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*
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* The "op" codes are different between the two, as well as the special
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* port fields for global PTP and TAI configuration.
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*/
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/* mv88e6xxx_g2_avb_read -- Read one or multiple 16-bit words.
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* The hardware supports snapshotting up to four contiguous registers.
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*/
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static int mv88e6xxx_g2_avb_wait(struct mv88e6xxx_chip *chip)
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{
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int bit = __bf_shf(MV88E6352_G2_AVB_CMD_BUSY);
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return mv88e6xxx_g2_wait_bit(chip, MV88E6352_G2_AVB_CMD, bit, 0);
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}
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static int mv88e6xxx_g2_avb_read(struct mv88e6xxx_chip *chip, u16 readop,
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u16 *data, int len)
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{
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int err;
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int i;
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err = mv88e6xxx_g2_avb_wait(chip);
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if (err)
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return err;
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/* Hardware can only snapshot four words. */
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if (len > 4)
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return -E2BIG;
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err = mv88e6xxx_g2_write(chip, MV88E6352_G2_AVB_CMD,
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MV88E6352_G2_AVB_CMD_BUSY | readop);
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if (err)
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return err;
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err = mv88e6xxx_g2_avb_wait(chip);
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if (err)
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return err;
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for (i = 0; i < len; ++i) {
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err = mv88e6xxx_g2_read(chip, MV88E6352_G2_AVB_DATA,
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&data[i]);
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if (err)
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return err;
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}
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return 0;
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}
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/* mv88e6xxx_g2_avb_write -- Write one 16-bit word. */
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static int mv88e6xxx_g2_avb_write(struct mv88e6xxx_chip *chip, u16 writeop,
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u16 data)
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{
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int err;
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err = mv88e6xxx_g2_avb_wait(chip);
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if (err)
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return err;
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err = mv88e6xxx_g2_write(chip, MV88E6352_G2_AVB_DATA, data);
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if (err)
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return err;
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err = mv88e6xxx_g2_write(chip, MV88E6352_G2_AVB_CMD,
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MV88E6352_G2_AVB_CMD_BUSY | writeop);
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return mv88e6xxx_g2_avb_wait(chip);
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}
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static int mv88e6352_g2_avb_port_ptp_read(struct mv88e6xxx_chip *chip,
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int port, int addr, u16 *data,
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int len)
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{
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u16 readop = (len == 1 ? MV88E6352_G2_AVB_CMD_OP_READ :
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MV88E6352_G2_AVB_CMD_OP_READ_INCR) |
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(port << 8) | (MV88E6352_G2_AVB_CMD_BLOCK_PTP << 5) |
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addr;
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return mv88e6xxx_g2_avb_read(chip, readop, data, len);
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}
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static int mv88e6352_g2_avb_port_ptp_write(struct mv88e6xxx_chip *chip,
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int port, int addr, u16 data)
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{
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u16 writeop = MV88E6352_G2_AVB_CMD_OP_WRITE | (port << 8) |
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(MV88E6352_G2_AVB_CMD_BLOCK_PTP << 5) | addr;
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return mv88e6xxx_g2_avb_write(chip, writeop, data);
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}
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static int mv88e6352_g2_avb_ptp_read(struct mv88e6xxx_chip *chip, int addr,
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u16 *data, int len)
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{
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return mv88e6352_g2_avb_port_ptp_read(chip,
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MV88E6352_G2_AVB_CMD_PORT_PTPGLOBAL,
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addr, data, len);
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}
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static int mv88e6352_g2_avb_ptp_write(struct mv88e6xxx_chip *chip, int addr,
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u16 data)
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{
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return mv88e6352_g2_avb_port_ptp_write(chip,
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MV88E6352_G2_AVB_CMD_PORT_PTPGLOBAL,
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addr, data);
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}
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static int mv88e6352_g2_avb_tai_read(struct mv88e6xxx_chip *chip, int addr,
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u16 *data, int len)
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{
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return mv88e6352_g2_avb_port_ptp_read(chip,
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MV88E6352_G2_AVB_CMD_PORT_TAIGLOBAL,
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addr, data, len);
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}
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static int mv88e6352_g2_avb_tai_write(struct mv88e6xxx_chip *chip, int addr,
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u16 data)
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{
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return mv88e6352_g2_avb_port_ptp_write(chip,
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MV88E6352_G2_AVB_CMD_PORT_TAIGLOBAL,
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addr, data);
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}
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const struct mv88e6xxx_avb_ops mv88e6352_avb_ops = {
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.port_ptp_read = mv88e6352_g2_avb_port_ptp_read,
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.port_ptp_write = mv88e6352_g2_avb_port_ptp_write,
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.ptp_read = mv88e6352_g2_avb_ptp_read,
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.ptp_write = mv88e6352_g2_avb_ptp_write,
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.tai_read = mv88e6352_g2_avb_tai_read,
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.tai_write = mv88e6352_g2_avb_tai_write,
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};
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static int mv88e6165_g2_avb_tai_read(struct mv88e6xxx_chip *chip, int addr,
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u16 *data, int len)
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{
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return mv88e6352_g2_avb_port_ptp_read(chip,
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MV88E6165_G2_AVB_CMD_PORT_PTPGLOBAL,
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addr, data, len);
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}
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static int mv88e6165_g2_avb_tai_write(struct mv88e6xxx_chip *chip, int addr,
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u16 data)
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{
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return mv88e6352_g2_avb_port_ptp_write(chip,
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MV88E6165_G2_AVB_CMD_PORT_PTPGLOBAL,
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addr, data);
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}
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const struct mv88e6xxx_avb_ops mv88e6165_avb_ops = {
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.port_ptp_read = mv88e6352_g2_avb_port_ptp_read,
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.port_ptp_write = mv88e6352_g2_avb_port_ptp_write,
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.ptp_read = mv88e6352_g2_avb_ptp_read,
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.ptp_write = mv88e6352_g2_avb_ptp_write,
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.tai_read = mv88e6165_g2_avb_tai_read,
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.tai_write = mv88e6165_g2_avb_tai_write,
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};
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static int mv88e6390_g2_avb_port_ptp_read(struct mv88e6xxx_chip *chip,
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int port, int addr, u16 *data,
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int len)
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{
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u16 readop = (len == 1 ? MV88E6390_G2_AVB_CMD_OP_READ :
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MV88E6390_G2_AVB_CMD_OP_READ_INCR) |
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(port << 8) | (MV88E6352_G2_AVB_CMD_BLOCK_PTP << 5) |
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addr;
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return mv88e6xxx_g2_avb_read(chip, readop, data, len);
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}
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static int mv88e6390_g2_avb_port_ptp_write(struct mv88e6xxx_chip *chip,
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int port, int addr, u16 data)
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{
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u16 writeop = MV88E6390_G2_AVB_CMD_OP_WRITE | (port << 8) |
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(MV88E6352_G2_AVB_CMD_BLOCK_PTP << 5) | addr;
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return mv88e6xxx_g2_avb_write(chip, writeop, data);
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}
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static int mv88e6390_g2_avb_ptp_read(struct mv88e6xxx_chip *chip, int addr,
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u16 *data, int len)
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{
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return mv88e6390_g2_avb_port_ptp_read(chip,
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MV88E6390_G2_AVB_CMD_PORT_PTPGLOBAL,
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addr, data, len);
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}
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static int mv88e6390_g2_avb_ptp_write(struct mv88e6xxx_chip *chip, int addr,
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u16 data)
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{
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return mv88e6390_g2_avb_port_ptp_write(chip,
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MV88E6390_G2_AVB_CMD_PORT_PTPGLOBAL,
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addr, data);
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}
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static int mv88e6390_g2_avb_tai_read(struct mv88e6xxx_chip *chip, int addr,
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u16 *data, int len)
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{
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return mv88e6390_g2_avb_port_ptp_read(chip,
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MV88E6390_G2_AVB_CMD_PORT_TAIGLOBAL,
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addr, data, len);
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}
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static int mv88e6390_g2_avb_tai_write(struct mv88e6xxx_chip *chip, int addr,
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u16 data)
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{
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return mv88e6390_g2_avb_port_ptp_write(chip,
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MV88E6390_G2_AVB_CMD_PORT_TAIGLOBAL,
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addr, data);
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}
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const struct mv88e6xxx_avb_ops mv88e6390_avb_ops = {
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.port_ptp_read = mv88e6390_g2_avb_port_ptp_read,
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.port_ptp_write = mv88e6390_g2_avb_port_ptp_write,
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.ptp_read = mv88e6390_g2_avb_ptp_read,
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.ptp_write = mv88e6390_g2_avb_ptp_write,
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.tai_read = mv88e6390_g2_avb_tai_read,
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.tai_write = mv88e6390_g2_avb_tai_write,
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};
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