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/*
* Marvell 88E6xxx Address Translation Unit (ATU) support
*
* Copyright (c) 2008 Marvell Semiconductor
* Copyright (c) 2017 Savoir-faire Linux, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/interrupt.h>
#include <linux/irqdomain.h>
#include "chip.h"
#include "global1.h"
/* Offset 0x01: ATU FID Register */
static int mv88e6xxx_g1_atu_fid_write(struct mv88e6xxx_chip *chip, u16 fid)
{
return mv88e6xxx_g1_write(chip, MV88E6352_G1_ATU_FID, fid & 0xfff);
}
/* Offset 0x0A: ATU Control Register */
int mv88e6xxx_g1_atu_set_learn2all(struct mv88e6xxx_chip *chip, bool learn2all)
{
u16 val;
int err;
err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_ATU_CTL, &val);
if (err)
return err;
if (learn2all)
val |= MV88E6XXX_G1_ATU_CTL_LEARN2ALL;
else
val &= ~MV88E6XXX_G1_ATU_CTL_LEARN2ALL;
return mv88e6xxx_g1_write(chip, MV88E6XXX_G1_ATU_CTL, val);
}
int mv88e6xxx_g1_atu_set_age_time(struct mv88e6xxx_chip *chip,
unsigned int msecs)
{
const unsigned int coeff = chip->info->age_time_coeff;
const unsigned int min = 0x01 * coeff;
const unsigned int max = 0xff * coeff;
u8 age_time;
u16 val;
int err;
if (msecs < min || msecs > max)
return -ERANGE;
/* Round to nearest multiple of coeff */
age_time = (msecs + coeff / 2) / coeff;
err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_ATU_CTL, &val);
if (err)
return err;
/* AgeTime is 11:4 bits */
val &= ~0xff0;
val |= age_time << 4;
err = mv88e6xxx_g1_write(chip, MV88E6XXX_G1_ATU_CTL, val);
if (err)
return err;
dev_dbg(chip->dev, "AgeTime set to 0x%02x (%d ms)\n", age_time,
age_time * coeff);
return 0;
}
/* Offset 0x0B: ATU Operation Register */
static int mv88e6xxx_g1_atu_op_wait(struct mv88e6xxx_chip *chip)
{
return mv88e6xxx_g1_wait(chip, MV88E6XXX_G1_ATU_OP,
MV88E6XXX_G1_ATU_OP_BUSY);
}
static int mv88e6xxx_g1_atu_op(struct mv88e6xxx_chip *chip, u16 fid, u16 op)
{
u16 val;
int err;
/* FID bits are dispatched all around gradually as more are supported */
if (mv88e6xxx_num_databases(chip) > 256) {
err = mv88e6xxx_g1_atu_fid_write(chip, fid);
if (err)
return err;
} else {
if (mv88e6xxx_num_databases(chip) > 16) {
/* ATU DBNum[7:4] are located in ATU Control 15:12 */
err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_ATU_CTL,
&val);
if (err)
return err;
val = (val & 0x0fff) | ((fid << 8) & 0xf000);
err = mv88e6xxx_g1_write(chip, MV88E6XXX_G1_ATU_CTL,
val);
if (err)
return err;
}
/* ATU DBNum[3:0] are located in ATU Operation 3:0 */
op |= fid & 0xf;
}
err = mv88e6xxx_g1_write(chip, MV88E6XXX_G1_ATU_OP,
MV88E6XXX_G1_ATU_OP_BUSY | op);
if (err)
return err;
return mv88e6xxx_g1_atu_op_wait(chip);
}
/* Offset 0x0C: ATU Data Register */
static int mv88e6xxx_g1_atu_data_read(struct mv88e6xxx_chip *chip,
struct mv88e6xxx_atu_entry *entry)
{
u16 val;
int err;
err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_ATU_DATA, &val);
if (err)
return err;
entry->state = val & 0xf;
if (entry->state != MV88E6XXX_G1_ATU_DATA_STATE_UNUSED) {
entry->trunk = !!(val & MV88E6XXX_G1_ATU_DATA_TRUNK);
entry->portvec = (val >> 4) & mv88e6xxx_port_mask(chip);
}
return 0;
}
static int mv88e6xxx_g1_atu_data_write(struct mv88e6xxx_chip *chip,
struct mv88e6xxx_atu_entry *entry)
{
u16 data = entry->state & 0xf;
if (entry->state != MV88E6XXX_G1_ATU_DATA_STATE_UNUSED) {
if (entry->trunk)
data |= MV88E6XXX_G1_ATU_DATA_TRUNK;
data |= (entry->portvec & mv88e6xxx_port_mask(chip)) << 4;
}
return mv88e6xxx_g1_write(chip, MV88E6XXX_G1_ATU_DATA, data);
}
/* Offset 0x0D: ATU MAC Address Register Bytes 0 & 1
* Offset 0x0E: ATU MAC Address Register Bytes 2 & 3
* Offset 0x0F: ATU MAC Address Register Bytes 4 & 5
*/
static int mv88e6xxx_g1_atu_mac_read(struct mv88e6xxx_chip *chip,
struct mv88e6xxx_atu_entry *entry)
{
u16 val;
int i, err;
for (i = 0; i < 3; i++) {
err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_ATU_MAC01 + i, &val);
if (err)
return err;
entry->mac[i * 2] = val >> 8;
entry->mac[i * 2 + 1] = val & 0xff;
}
return 0;
}
static int mv88e6xxx_g1_atu_mac_write(struct mv88e6xxx_chip *chip,
struct mv88e6xxx_atu_entry *entry)
{
u16 val;
int i, err;
for (i = 0; i < 3; i++) {
val = (entry->mac[i * 2] << 8) | entry->mac[i * 2 + 1];
err = mv88e6xxx_g1_write(chip, MV88E6XXX_G1_ATU_MAC01 + i, val);
if (err)
return err;
}
return 0;
}
/* Address Translation Unit operations */
int mv88e6xxx_g1_atu_getnext(struct mv88e6xxx_chip *chip, u16 fid,
struct mv88e6xxx_atu_entry *entry)
{
int err;
err = mv88e6xxx_g1_atu_op_wait(chip);
if (err)
return err;
/* Write the MAC address to iterate from only once */
if (entry->state == MV88E6XXX_G1_ATU_DATA_STATE_UNUSED) {
err = mv88e6xxx_g1_atu_mac_write(chip, entry);
if (err)
return err;
}
err = mv88e6xxx_g1_atu_op(chip, fid, MV88E6XXX_G1_ATU_OP_GET_NEXT_DB);
if (err)
return err;
err = mv88e6xxx_g1_atu_data_read(chip, entry);
if (err)
return err;
return mv88e6xxx_g1_atu_mac_read(chip, entry);
}
int mv88e6xxx_g1_atu_loadpurge(struct mv88e6xxx_chip *chip, u16 fid,
struct mv88e6xxx_atu_entry *entry)
{
int err;
err = mv88e6xxx_g1_atu_op_wait(chip);
if (err)
return err;
err = mv88e6xxx_g1_atu_mac_write(chip, entry);
if (err)
return err;
err = mv88e6xxx_g1_atu_data_write(chip, entry);
if (err)
return err;
return mv88e6xxx_g1_atu_op(chip, fid, MV88E6XXX_G1_ATU_OP_LOAD_DB);
}
static int mv88e6xxx_g1_atu_flushmove(struct mv88e6xxx_chip *chip, u16 fid,
struct mv88e6xxx_atu_entry *entry,
bool all)
{
u16 op;
int err;
err = mv88e6xxx_g1_atu_op_wait(chip);
if (err)
return err;
err = mv88e6xxx_g1_atu_data_write(chip, entry);
if (err)
return err;
/* Flush/Move all or non-static entries from all or a given database */
if (all && fid)
op = MV88E6XXX_G1_ATU_OP_FLUSH_MOVE_ALL_DB;
else if (fid)
op = MV88E6XXX_G1_ATU_OP_FLUSH_MOVE_NON_STATIC_DB;
else if (all)
op = MV88E6XXX_G1_ATU_OP_FLUSH_MOVE_ALL;
else
op = MV88E6XXX_G1_ATU_OP_FLUSH_MOVE_NON_STATIC;
return mv88e6xxx_g1_atu_op(chip, fid, op);
}
int mv88e6xxx_g1_atu_flush(struct mv88e6xxx_chip *chip, u16 fid, bool all)
{
struct mv88e6xxx_atu_entry entry = {
.state = 0, /* Null EntryState means Flush */
};
return mv88e6xxx_g1_atu_flushmove(chip, fid, &entry, all);
}
static int mv88e6xxx_g1_atu_move(struct mv88e6xxx_chip *chip, u16 fid,
int from_port, int to_port, bool all)
{
struct mv88e6xxx_atu_entry entry = { 0 };
unsigned long mask;
int shift;
if (!chip->info->atu_move_port_mask)
return -EOPNOTSUPP;
mask = chip->info->atu_move_port_mask;
shift = bitmap_weight(&mask, 16);
entry.state = 0xf, /* Full EntryState means Move */
entry.portvec = from_port & mask;
entry.portvec |= (to_port & mask) << shift;
return mv88e6xxx_g1_atu_flushmove(chip, fid, &entry, all);
}
int mv88e6xxx_g1_atu_remove(struct mv88e6xxx_chip *chip, u16 fid, int port,
bool all)
{
int from_port = port;
int to_port = chip->info->atu_move_port_mask;
return mv88e6xxx_g1_atu_move(chip, fid, from_port, to_port, all);
}
static irqreturn_t mv88e6xxx_g1_atu_prob_irq_thread_fn(int irq, void *dev_id)
{
struct mv88e6xxx_chip *chip = dev_id;
struct mv88e6xxx_atu_entry entry;
int err;
u16 val;
mutex_lock(&chip->reg_lock);
err = mv88e6xxx_g1_atu_op(chip, 0,
MV88E6XXX_G1_ATU_OP_GET_CLR_VIOLATION);
if (err)
goto out;
err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_ATU_OP, &val);
if (err)
goto out;
err = mv88e6xxx_g1_atu_data_read(chip, &entry);
if (err)
goto out;
err = mv88e6xxx_g1_atu_mac_read(chip, &entry);
if (err)
goto out;
if (val & MV88E6XXX_G1_ATU_OP_AGE_OUT_VIOLATION) {
dev_err_ratelimited(chip->dev,
"ATU age out violation for %pM\n",
entry.mac);
}
if (val & MV88E6XXX_G1_ATU_OP_MEMBER_VIOLATION) {
dev_err_ratelimited(chip->dev,
"ATU member violation for %pM portvec %x\n",
entry.mac, entry.portvec);
chip->ports[entry.portvec].atu_member_violation++;
}
if (val & MV88E6XXX_G1_ATU_OP_MISS_VIOLATION) {
dev_err_ratelimited(chip->dev,
"ATU miss violation for %pM portvec %x\n",
entry.mac, entry.portvec);
chip->ports[entry.portvec].atu_miss_violation++;
}
if (val & MV88E6XXX_G1_ATU_OP_FULL_VIOLATION) {
dev_err_ratelimited(chip->dev,
"ATU full violation for %pM portvec %x\n",
entry.mac, entry.portvec);
chip->ports[entry.portvec].atu_full_violation++;
}
mutex_unlock(&chip->reg_lock);
return IRQ_HANDLED;
out:
mutex_unlock(&chip->reg_lock);
dev_err(chip->dev, "ATU problem: error %d while handling interrupt\n",
err);
return IRQ_HANDLED;
}
int mv88e6xxx_g1_atu_prob_irq_setup(struct mv88e6xxx_chip *chip)
{
int err;
chip->atu_prob_irq = irq_find_mapping(chip->g1_irq.domain,
MV88E6XXX_G1_STS_IRQ_ATU_PROB);
if (chip->atu_prob_irq < 0)
return chip->atu_prob_irq;
err = request_threaded_irq(chip->atu_prob_irq, NULL,
mv88e6xxx_g1_atu_prob_irq_thread_fn,
IRQF_ONESHOT, "mv88e6xxx-g1-atu-prob",
chip);
if (err)
irq_dispose_mapping(chip->atu_prob_irq);
return err;
}
void mv88e6xxx_g1_atu_prob_irq_free(struct mv88e6xxx_chip *chip)
{
free_irq(chip->atu_prob_irq, chip);
irq_dispose_mapping(chip->atu_prob_irq);
}
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