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linux/drivers/net/dsa/mv88e6xxx/global1.c
Matthias Schiffer e44894e2aa net: dsa: mv88e6xxx: Avoid EEPROM timeout without EEPROM on 88E6250-family switches 
88E6250-family switches have the quirk that the EEPROM Running flag can
get stuck at 1 when no EEPROM is connected, causing
mv88e6xxx_g2_eeprom_wait() to time out. We still want to wait for the
EEPROM however, to avoid interrupting a transfer and leaving the EEPROM
in an invalid state.

The condition to wait for recommended by the hardware spec is the EEInt
flag, however this flag is cleared on read, so before the hardware reset,
is may have been cleared already even though the EEPROM has been read
successfully.

For this reason, we revive the mv88e6xxx_g1_wait_eeprom_done() function
that was removed in commit 6ccf50d4d4
("net: dsa: mv88e6xxx: Avoid EEPROM timeout when EEPROM is absent") in a
slightly refactored form, and introduce a new
mv88e6xxx_g1_wait_eeprom_done_prereset() that additionally handles this
case by triggering another EEPROM reload that can be waited on.

On other switch models without this quirk, mv88e6xxx_g2_eeprom_wait() is
kept, as it avoids the additional reload.

Fixes: 6ccf50d4d4 ("net: dsa: mv88e6xxx: Avoid EEPROM timeout when EEPROM is absent")
Signed-off-by: Matthias Schiffer <matthias.schiffer@ew.tq-group.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
2024-04-25 11:24:07 +01:00

680 lines
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Marvell 88E6xxx Switch Global (1) Registers support
*
* Copyright (c) 2008 Marvell Semiconductor
*
* Copyright (c) 2016-2017 Savoir-faire Linux Inc.
* Vivien Didelot <vivien.didelot@savoirfairelinux.com>
*/
#include <linux/bitfield.h>
#include "chip.h"
#include "global1.h"
int mv88e6xxx_g1_read(struct mv88e6xxx_chip *chip, int reg, u16 *val)
{
int addr = chip->info->global1_addr;
return mv88e6xxx_read(chip, addr, reg, val);
}
int mv88e6xxx_g1_write(struct mv88e6xxx_chip *chip, int reg, u16 val)
{
int addr = chip->info->global1_addr;
return mv88e6xxx_write(chip, addr, reg, val);
}
int mv88e6xxx_g1_wait_bit(struct mv88e6xxx_chip *chip, int reg, int
bit, int val)
{
return mv88e6xxx_wait_bit(chip, chip->info->global1_addr, reg,
bit, val);
}
int mv88e6xxx_g1_wait_mask(struct mv88e6xxx_chip *chip, int reg,
u16 mask, u16 val)
{
return mv88e6xxx_wait_mask(chip, chip->info->global1_addr, reg,
mask, val);
}
/* Offset 0x00: Switch Global Status Register */
static int mv88e6185_g1_wait_ppu_disabled(struct mv88e6xxx_chip *chip)
{
return mv88e6xxx_g1_wait_mask(chip, MV88E6XXX_G1_STS,
MV88E6185_G1_STS_PPU_STATE_MASK,
MV88E6185_G1_STS_PPU_STATE_DISABLED);
}
static int mv88e6185_g1_wait_ppu_polling(struct mv88e6xxx_chip *chip)
{
return mv88e6xxx_g1_wait_mask(chip, MV88E6XXX_G1_STS,
MV88E6185_G1_STS_PPU_STATE_MASK,
MV88E6185_G1_STS_PPU_STATE_POLLING);
}
static int mv88e6352_g1_wait_ppu_polling(struct mv88e6xxx_chip *chip)
{
int bit = __bf_shf(MV88E6352_G1_STS_PPU_STATE);
return mv88e6xxx_g1_wait_bit(chip, MV88E6XXX_G1_STS, bit, 1);
}
static int mv88e6xxx_g1_wait_init_ready(struct mv88e6xxx_chip *chip)
{
int bit = __bf_shf(MV88E6XXX_G1_STS_INIT_READY);
/* Wait up to 1 second for the switch to be ready. The InitReady bit 11
* is set to a one when all units inside the device (ATU, VTU, etc.)
* have finished their initialization and are ready to accept frames.
*/
return mv88e6xxx_g1_wait_bit(chip, MV88E6XXX_G1_STS, bit, 1);
}
static int mv88e6250_g1_eeprom_reload(struct mv88e6xxx_chip *chip)
{
/* MV88E6185_G1_CTL1_RELOAD_EEPROM is also valid for 88E6250 */
int bit = __bf_shf(MV88E6185_G1_CTL1_RELOAD_EEPROM);
u16 val;
int err;
err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_CTL1, &val);
if (err)
return err;
val |= MV88E6185_G1_CTL1_RELOAD_EEPROM;
err = mv88e6xxx_g1_write(chip, MV88E6XXX_G1_CTL1, val);
if (err)
return err;
return mv88e6xxx_g1_wait_bit(chip, MV88E6XXX_G1_CTL1, bit, 0);
}
/* Returns 0 when done, -EBUSY when waiting, other negative codes on error */
static int mv88e6xxx_g1_is_eeprom_done(struct mv88e6xxx_chip *chip)
{
u16 val;
int err;
err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_STS, &val);
if (err < 0) {
dev_err(chip->dev, "Error reading status");
return err;
}
/* If the switch is still resetting, it may not
* respond on the bus, and so MDIO read returns
* 0xffff. Differentiate between that, and waiting for
* the EEPROM to be done by bit 0 being set.
*/
if (val == 0xffff || !(val & BIT(MV88E6XXX_G1_STS_IRQ_EEPROM_DONE)))
return -EBUSY;
return 0;
}
/* As the EEInt (EEPROM done) flag clears on read if the status register, this
* function must be called directly after a hard reset or EEPROM ReLoad request,
* or the done condition may have been missed
*/
int mv88e6xxx_g1_wait_eeprom_done(struct mv88e6xxx_chip *chip)
{
const unsigned long timeout = jiffies + 1 * HZ;
int ret;
/* Wait up to 1 second for the switch to finish reading the
* EEPROM.
*/
while (time_before(jiffies, timeout)) {
ret = mv88e6xxx_g1_is_eeprom_done(chip);
if (ret != -EBUSY)
return ret;
}
dev_err(chip->dev, "Timeout waiting for EEPROM done");
return -ETIMEDOUT;
}
int mv88e6250_g1_wait_eeprom_done_prereset(struct mv88e6xxx_chip *chip)
{
int ret;
ret = mv88e6xxx_g1_is_eeprom_done(chip);
if (ret != -EBUSY)
return ret;
/* Pre-reset, we don't know the state of the switch - when
* mv88e6xxx_g1_is_eeprom_done() returns -EBUSY, that may be because
* the switch is actually busy reading the EEPROM, or because
* MV88E6XXX_G1_STS_IRQ_EEPROM_DONE has been cleared by an unrelated
* status register read already.
*
* To account for the latter case, trigger another EEPROM reload for
* another chance at seeing the done flag.
*/
ret = mv88e6250_g1_eeprom_reload(chip);
if (ret)
return ret;
return mv88e6xxx_g1_wait_eeprom_done(chip);
}
/* Offset 0x01: Switch MAC Address Register Bytes 0 & 1
* Offset 0x02: Switch MAC Address Register Bytes 2 & 3
* Offset 0x03: Switch MAC Address Register Bytes 4 & 5
*/
int mv88e6xxx_g1_set_switch_mac(struct mv88e6xxx_chip *chip, u8 *addr)
{
u16 reg;
int err;
reg = (addr[0] << 8) | addr[1];
err = mv88e6xxx_g1_write(chip, MV88E6XXX_G1_MAC_01, reg);
if (err)
return err;
reg = (addr[2] << 8) | addr[3];
err = mv88e6xxx_g1_write(chip, MV88E6XXX_G1_MAC_23, reg);
if (err)
return err;
reg = (addr[4] << 8) | addr[5];
err = mv88e6xxx_g1_write(chip, MV88E6XXX_G1_MAC_45, reg);
if (err)
return err;
return 0;
}
/* Offset 0x04: Switch Global Control Register */
int mv88e6185_g1_reset(struct mv88e6xxx_chip *chip)
{
u16 val;
int err;
/* Set the SWReset bit 15 along with the PPUEn bit 14, to also restart
* the PPU, including re-doing PHY detection and initialization
*/
err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_CTL1, &val);
if (err)
return err;
val |= MV88E6XXX_G1_CTL1_SW_RESET;
val |= MV88E6XXX_G1_CTL1_PPU_ENABLE;
err = mv88e6xxx_g1_write(chip, MV88E6XXX_G1_CTL1, val);
if (err)
return err;
err = mv88e6xxx_g1_wait_init_ready(chip);
if (err)
return err;
return mv88e6185_g1_wait_ppu_polling(chip);
}
int mv88e6250_g1_reset(struct mv88e6xxx_chip *chip)
{
u16 val;
int err;
/* Set the SWReset bit 15 */
err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_CTL1, &val);
if (err)
return err;
val |= MV88E6XXX_G1_CTL1_SW_RESET;
err = mv88e6xxx_g1_write(chip, MV88E6XXX_G1_CTL1, val);
if (err)
return err;
return mv88e6xxx_g1_wait_init_ready(chip);
}
int mv88e6352_g1_reset(struct mv88e6xxx_chip *chip)
{
int err;
err = mv88e6250_g1_reset(chip);
if (err)
return err;
return mv88e6352_g1_wait_ppu_polling(chip);
}
int mv88e6185_g1_ppu_enable(struct mv88e6xxx_chip *chip)
{
u16 val;
int err;
err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_CTL1, &val);
if (err)
return err;
val |= MV88E6XXX_G1_CTL1_PPU_ENABLE;
err = mv88e6xxx_g1_write(chip, MV88E6XXX_G1_CTL1, val);
if (err)
return err;
return mv88e6185_g1_wait_ppu_polling(chip);
}
int mv88e6185_g1_ppu_disable(struct mv88e6xxx_chip *chip)
{
u16 val;
int err;
err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_CTL1, &val);
if (err)
return err;
val &= ~MV88E6XXX_G1_CTL1_PPU_ENABLE;
err = mv88e6xxx_g1_write(chip, MV88E6XXX_G1_CTL1, val);
if (err)
return err;
return mv88e6185_g1_wait_ppu_disabled(chip);
}
int mv88e6185_g1_set_max_frame_size(struct mv88e6xxx_chip *chip, int mtu)
{
u16 val;
int err;
mtu += ETH_HLEN + ETH_FCS_LEN;
err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_CTL1, &val);
if (err)
return err;
val &= ~MV88E6185_G1_CTL1_MAX_FRAME_1632;
if (mtu > 1518)
val |= MV88E6185_G1_CTL1_MAX_FRAME_1632;
return mv88e6xxx_g1_write(chip, MV88E6XXX_G1_CTL1, val);
}
/* Offset 0x10: IP-PRI Mapping Register 0
* Offset 0x11: IP-PRI Mapping Register 1
* Offset 0x12: IP-PRI Mapping Register 2
* Offset 0x13: IP-PRI Mapping Register 3
* Offset 0x14: IP-PRI Mapping Register 4
* Offset 0x15: IP-PRI Mapping Register 5
* Offset 0x16: IP-PRI Mapping Register 6
* Offset 0x17: IP-PRI Mapping Register 7
*/
int mv88e6085_g1_ip_pri_map(struct mv88e6xxx_chip *chip)
{
int err;
/* Reset the IP TOS/DiffServ/Traffic priorities to defaults */
err = mv88e6xxx_g1_write(chip, MV88E6XXX_G1_IP_PRI_0, 0x0000);
if (err)
return err;
err = mv88e6xxx_g1_write(chip, MV88E6XXX_G1_IP_PRI_1, 0x0000);
if (err)
return err;
err = mv88e6xxx_g1_write(chip, MV88E6XXX_G1_IP_PRI_2, 0x5555);
if (err)
return err;
err = mv88e6xxx_g1_write(chip, MV88E6XXX_G1_IP_PRI_3, 0x5555);
if (err)
return err;
err = mv88e6xxx_g1_write(chip, MV88E6XXX_G1_IP_PRI_4, 0xaaaa);
if (err)
return err;
err = mv88e6xxx_g1_write(chip, MV88E6XXX_G1_IP_PRI_5, 0xaaaa);
if (err)
return err;
err = mv88e6xxx_g1_write(chip, MV88E6XXX_G1_IP_PRI_6, 0xffff);
if (err)
return err;
err = mv88e6xxx_g1_write(chip, MV88E6XXX_G1_IP_PRI_7, 0xffff);
if (err)
return err;
return 0;
}
/* Offset 0x18: IEEE-PRI Register */
int mv88e6085_g1_ieee_pri_map(struct mv88e6xxx_chip *chip)
{
/* Reset the IEEE Tag priorities to defaults */
return mv88e6xxx_g1_write(chip, MV88E6XXX_G1_IEEE_PRI, 0xfa41);
}
int mv88e6250_g1_ieee_pri_map(struct mv88e6xxx_chip *chip)
{
/* Reset the IEEE Tag priorities to defaults */
return mv88e6xxx_g1_write(chip, MV88E6XXX_G1_IEEE_PRI, 0xfa50);
}
/* Offset 0x1a: Monitor Control */
/* Offset 0x1a: Monitor & MGMT Control on some devices */
int mv88e6095_g1_set_egress_port(struct mv88e6xxx_chip *chip,
enum mv88e6xxx_egress_direction direction,
int port)
{
u16 reg;
int err;
err = mv88e6xxx_g1_read(chip, MV88E6185_G1_MONITOR_CTL, &reg);
if (err)
return err;
switch (direction) {
case MV88E6XXX_EGRESS_DIR_INGRESS:
reg &= ~MV88E6185_G1_MONITOR_CTL_INGRESS_DEST_MASK;
reg |= port <<
__bf_shf(MV88E6185_G1_MONITOR_CTL_INGRESS_DEST_MASK);
break;
case MV88E6XXX_EGRESS_DIR_EGRESS:
reg &= ~MV88E6185_G1_MONITOR_CTL_EGRESS_DEST_MASK;
reg |= port <<
__bf_shf(MV88E6185_G1_MONITOR_CTL_EGRESS_DEST_MASK);
break;
default:
return -EINVAL;
}
return mv88e6xxx_g1_write(chip, MV88E6185_G1_MONITOR_CTL, reg);
}
/* Older generations also call this the ARP destination. It has been
* generalized in more modern devices such that more than ARP can
* egress it
*/
int mv88e6095_g1_set_cpu_port(struct mv88e6xxx_chip *chip, int port)
{
u16 reg;
int err;
err = mv88e6xxx_g1_read(chip, MV88E6185_G1_MONITOR_CTL, &reg);
if (err)
return err;
reg &= ~MV88E6185_G1_MONITOR_CTL_ARP_DEST_MASK;
reg |= port << __bf_shf(MV88E6185_G1_MONITOR_CTL_ARP_DEST_MASK);
return mv88e6xxx_g1_write(chip, MV88E6185_G1_MONITOR_CTL, reg);
}
static int mv88e6390_g1_monitor_write(struct mv88e6xxx_chip *chip,
u16 pointer, u8 data)
{
u16 reg;
reg = MV88E6390_G1_MONITOR_MGMT_CTL_UPDATE | pointer | data;
return mv88e6xxx_g1_write(chip, MV88E6390_G1_MONITOR_MGMT_CTL, reg);
}
int mv88e6390_g1_set_egress_port(struct mv88e6xxx_chip *chip,
enum mv88e6xxx_egress_direction direction,
int port)
{
u16 ptr;
switch (direction) {
case MV88E6XXX_EGRESS_DIR_INGRESS:
ptr = MV88E6390_G1_MONITOR_MGMT_CTL_PTR_INGRESS_DEST;
break;
case MV88E6XXX_EGRESS_DIR_EGRESS:
ptr = MV88E6390_G1_MONITOR_MGMT_CTL_PTR_EGRESS_DEST;
break;
default:
return -EINVAL;
}
return mv88e6390_g1_monitor_write(chip, ptr, port);
}
int mv88e6390_g1_set_cpu_port(struct mv88e6xxx_chip *chip, int port)
{
u16 ptr = MV88E6390_G1_MONITOR_MGMT_CTL_PTR_CPU_DEST;
/* Use the default high priority for management frames sent to
* the CPU.
*/
port |= MV88E6390_G1_MONITOR_MGMT_CTL_PTR_CPU_DEST_MGMTPRI;
return mv88e6390_g1_monitor_write(chip, ptr, port);
}
int mv88e6390_g1_set_ptp_cpu_port(struct mv88e6xxx_chip *chip, int port)
{
u16 ptr = MV88E6390_G1_MONITOR_MGMT_CTL_PTR_PTP_CPU_DEST;
/* Use the default high priority for PTP frames sent to
* the CPU.
*/
port |= MV88E6390_G1_MONITOR_MGMT_CTL_PTR_CPU_DEST_MGMTPRI;
return mv88e6390_g1_monitor_write(chip, ptr, port);
}
int mv88e6390_g1_mgmt_rsvd2cpu(struct mv88e6xxx_chip *chip)
{
u16 ptr;
int err;
/* 01:80:c2:00:00:00-01:80:c2:00:00:07 are Management */
ptr = MV88E6390_G1_MONITOR_MGMT_CTL_PTR_0180C200000XLO;
err = mv88e6390_g1_monitor_write(chip, ptr, 0xff);
if (err)
return err;
/* 01:80:c2:00:00:08-01:80:c2:00:00:0f are Management */
ptr = MV88E6390_G1_MONITOR_MGMT_CTL_PTR_0180C200000XHI;
err = mv88e6390_g1_monitor_write(chip, ptr, 0xff);
if (err)
return err;
/* 01:80:c2:00:00:20-01:80:c2:00:00:27 are Management */
ptr = MV88E6390_G1_MONITOR_MGMT_CTL_PTR_0180C200002XLO;
err = mv88e6390_g1_monitor_write(chip, ptr, 0xff);
if (err)
return err;
/* 01:80:c2:00:00:28-01:80:c2:00:00:2f are Management */
ptr = MV88E6390_G1_MONITOR_MGMT_CTL_PTR_0180C200002XHI;
err = mv88e6390_g1_monitor_write(chip, ptr, 0xff);
if (err)
return err;
return 0;
}
/* Offset 0x1c: Global Control 2 */
static int mv88e6xxx_g1_ctl2_mask(struct mv88e6xxx_chip *chip, u16 mask,
u16 val)
{
u16 reg;
int err;
err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_CTL2, &reg);
if (err)
return err;
reg &= ~mask;
reg |= val & mask;
return mv88e6xxx_g1_write(chip, MV88E6XXX_G1_CTL2, reg);
}
int mv88e6185_g1_set_cascade_port(struct mv88e6xxx_chip *chip, int port)
{
const u16 mask = MV88E6185_G1_CTL2_CASCADE_PORT_MASK;
return mv88e6xxx_g1_ctl2_mask(chip, mask, port << __bf_shf(mask));
}
int mv88e6085_g1_rmu_disable(struct mv88e6xxx_chip *chip)
{
return mv88e6xxx_g1_ctl2_mask(chip, MV88E6085_G1_CTL2_P10RM |
MV88E6085_G1_CTL2_RM_ENABLE, 0);
}
int mv88e6352_g1_rmu_disable(struct mv88e6xxx_chip *chip)
{
return mv88e6xxx_g1_ctl2_mask(chip, MV88E6352_G1_CTL2_RMU_MODE_MASK,
MV88E6352_G1_CTL2_RMU_MODE_DISABLED);
}
int mv88e6390_g1_rmu_disable(struct mv88e6xxx_chip *chip)
{
return mv88e6xxx_g1_ctl2_mask(chip, MV88E6390_G1_CTL2_RMU_MODE_MASK,
MV88E6390_G1_CTL2_RMU_MODE_DISABLED);
}
int mv88e6390_g1_stats_set_histogram(struct mv88e6xxx_chip *chip)
{
return mv88e6xxx_g1_ctl2_mask(chip, MV88E6390_G1_CTL2_HIST_MODE_MASK,
MV88E6390_G1_CTL2_HIST_MODE_RX);
}
int mv88e6xxx_g1_set_device_number(struct mv88e6xxx_chip *chip, int index)
{
return mv88e6xxx_g1_ctl2_mask(chip,
MV88E6XXX_G1_CTL2_DEVICE_NUMBER_MASK,
index);
}
/* Offset 0x1d: Statistics Operation 2 */
static int mv88e6xxx_g1_stats_wait(struct mv88e6xxx_chip *chip)
{
int bit = __bf_shf(MV88E6XXX_G1_STATS_OP_BUSY);
return mv88e6xxx_g1_wait_bit(chip, MV88E6XXX_G1_STATS_OP, bit, 0);
}
int mv88e6095_g1_stats_set_histogram(struct mv88e6xxx_chip *chip)
{
u16 val;
int err;
err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_STATS_OP, &val);
if (err)
return err;
val |= MV88E6XXX_G1_STATS_OP_HIST_RX;
err = mv88e6xxx_g1_write(chip, MV88E6XXX_G1_STATS_OP, val);
return err;
}
int mv88e6xxx_g1_stats_snapshot(struct mv88e6xxx_chip *chip, int port)
{
int err;
/* Snapshot the hardware statistics counters for this port. */
err = mv88e6xxx_g1_write(chip, MV88E6XXX_G1_STATS_OP,
MV88E6XXX_G1_STATS_OP_BUSY |
MV88E6XXX_G1_STATS_OP_CAPTURE_PORT |
MV88E6XXX_G1_STATS_OP_HIST_RX | port);
if (err)
return err;
/* Wait for the snapshotting to complete. */
return mv88e6xxx_g1_stats_wait(chip);
}
int mv88e6320_g1_stats_snapshot(struct mv88e6xxx_chip *chip, int port)
{
port = (port + 1) << 5;
return mv88e6xxx_g1_stats_snapshot(chip, port);
}
int mv88e6390_g1_stats_snapshot(struct mv88e6xxx_chip *chip, int port)
{
int err;
port = (port + 1) << 5;
/* Snapshot the hardware statistics counters for this port. */
err = mv88e6xxx_g1_write(chip, MV88E6XXX_G1_STATS_OP,
MV88E6XXX_G1_STATS_OP_BUSY |
MV88E6XXX_G1_STATS_OP_CAPTURE_PORT | port);
if (err)
return err;
/* Wait for the snapshotting to complete. */
return mv88e6xxx_g1_stats_wait(chip);
}
void mv88e6xxx_g1_stats_read(struct mv88e6xxx_chip *chip, int stat, u32 *val)
{
u32 value;
u16 reg;
int err;
*val = 0;
err = mv88e6xxx_g1_write(chip, MV88E6XXX_G1_STATS_OP,
MV88E6XXX_G1_STATS_OP_BUSY |
MV88E6XXX_G1_STATS_OP_READ_CAPTURED | stat);
if (err)
return;
err = mv88e6xxx_g1_stats_wait(chip);
if (err)
return;
err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_STATS_COUNTER_32, &reg);
if (err)
return;
value = reg << 16;
err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_STATS_COUNTER_01, &reg);
if (err)
return;
*val = value | reg;
}
int mv88e6xxx_g1_stats_clear(struct mv88e6xxx_chip *chip)
{
int err;
u16 val;
err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_STATS_OP, &val);
if (err)
return err;
/* Keep the histogram mode bits */
val &= MV88E6XXX_G1_STATS_OP_HIST_RX_TX;
val |= MV88E6XXX_G1_STATS_OP_BUSY | MV88E6XXX_G1_STATS_OP_FLUSH_ALL;
err = mv88e6xxx_g1_write(chip, MV88E6XXX_G1_STATS_OP, val);
if (err)
return err;
/* Wait for the flush to complete. */
return mv88e6xxx_g1_stats_wait(chip);
}
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