mv88e6131.c

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/*
 * net/dsa/mv88e6131.c - Marvell 88e6095/6095f/6131 switch chip support
 * Copyright (c) 2008-2009 Marvell Semiconductor
 *
 * 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/list.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/phy.h>
#include <net/dsa.h>
#include "mv88e6xxx.h"

/*
 * Switch product IDs
 */
#define ID_6085     0x04a0
#define ID_6095     0x0950
#define ID_6131     0x1060

static char *mv88e6131_probe(struct mii_bus *bus, int sw_addr)
{
    int ret;

    ret = __mv88e6xxx_reg_read(bus, sw_addr, REG_PORT(0), 0x03);
    if (ret >= 0) {
        ret &= 0xfff0;
        if (ret == ID_6085)
            return "Marvell 88E6085";
        if (ret == ID_6095)
            return "Marvell 88E6095/88E6095F";
        if (ret == ID_6131)
            return "Marvell 88E6131";
    }

    return NULL;
}

static int mv88e6131_switch_reset(struct dsa_switch *ds)
{
    int i;
    int ret;

    /*
     * Set all ports to the disabled state.
     */
    for (i = 0; i < 11; i++) {
        ret = REG_READ(REG_PORT(i), 0x04);
        REG_WRITE(REG_PORT(i), 0x04, ret & 0xfffc);
    }

    /*
     * Wait for transmit queues to drain.
     */
    msleep(2);

    /*
     * Reset the switch.
     */
    REG_WRITE(REG_GLOBAL, 0x04, 0xc400);

    /*
     * Wait up to one second for reset to complete.
     */
    for (i = 0; i < 1000; i++) {
        ret = REG_READ(REG_GLOBAL, 0x00);
        if ((ret & 0xc800) == 0xc800)
            break;

        msleep(1);
    }
    if (i == 1000)
        return -ETIMEDOUT;

    return 0;
}

static int mv88e6131_setup_global(struct dsa_switch *ds)
{
    int ret;
    int i;

    /*
     * Enable the PHY polling unit, don't discard packets with
     * excessive collisions, use a weighted fair queueing scheme
     * to arbitrate between packet queues, set the maximum frame
     * size to 1632, and mask all interrupt sources.
     */
    REG_WRITE(REG_GLOBAL, 0x04, 0x4400);

    /*
     * Set the default address aging time to 5 minutes, and
     * enable address learn messages to be sent to all message
     * ports.
     */
    REG_WRITE(REG_GLOBAL, 0x0a, 0x0148);

    /*
     * Configure the priority mapping registers.
     */
    ret = mv88e6xxx_config_prio(ds);
    if (ret < 0)
        return ret;

    /*
     * Set the VLAN ethertype to 0x8100.
     */
    REG_WRITE(REG_GLOBAL, 0x19, 0x8100);

    /*
     * Disable ARP mirroring, and configure the upstream port as
     * the port to which ingress and egress monitor frames are to
     * be sent.
     */
    REG_WRITE(REG_GLOBAL, 0x1a, (dsa_upstream_port(ds) * 0x1100) | 0x00f0);

    /*
     * Disable cascade port functionality unless this device
     * is used in a cascade configuration, and set the switch's
     * DSA device number.
     */
    if (ds->dst->pd->nr_chips > 1)
        REG_WRITE(REG_GLOBAL, 0x1c, 0xf000 | (ds->index & 0x1f));
    else
        REG_WRITE(REG_GLOBAL, 0x1c, 0xe000 | (ds->index & 0x1f));

    /*
     * Send all frames with destination addresses matching
     * 01:80:c2:00:00:0x to the CPU port.
     */
    REG_WRITE(REG_GLOBAL2, 0x03, 0xffff);

    /*
     * Ignore removed tag data on doubly tagged packets, disable
     * flow control messages, force flow control priority to the
     * highest, and send all special multicast frames to the CPU
     * port at the highest priority.
     */
    REG_WRITE(REG_GLOBAL2, 0x05, 0x00ff);

    /*
     * Program the DSA routing table.
     */
    for (i = 0; i < 32; i++) {
        int nexthop;

        nexthop = 0x1f;
        if (i != ds->index && i < ds->dst->pd->nr_chips)
            nexthop = ds->pd->rtable[i] & 0x1f;

        REG_WRITE(REG_GLOBAL2, 0x06, 0x8000 | (i << 8) | nexthop);
    }

    /*
     * Clear all trunk masks.
     */
    for (i = 0; i < 8; i++)
        REG_WRITE(REG_GLOBAL2, 0x07, 0x8000 | (i << 12) | 0x7ff);

    /*
     * Clear all trunk mappings.
     */
    for (i = 0; i < 16; i++)
        REG_WRITE(REG_GLOBAL2, 0x08, 0x8000 | (i << 11));

    /*
     * Force the priority of IGMP/MLD snoop frames and ARP frames
     * to the highest setting.
     */
    REG_WRITE(REG_GLOBAL2, 0x0f, 0x00ff);

    return 0;
}

static int mv88e6131_setup_port(struct dsa_switch *ds, int p)
{
    struct mv88e6xxx_priv_state *ps = (void *)(ds + 1);
    int addr = REG_PORT(p);
    u16 val;

    /*
     * MAC Forcing register: don't force link, speed, duplex
     * or flow control state to any particular values on physical
     * ports, but force the CPU port and all DSA ports to 1000 Mb/s
     * (100 Mb/s on 6085) full duplex.
     */
    if (dsa_is_cpu_port(ds, p) || ds->dsa_port_mask & (1 << p))
        if (ps->id == ID_6085)
            REG_WRITE(addr, 0x01, 0x003d); /* 100 Mb/s */
        else
            REG_WRITE(addr, 0x01, 0x003e); /* 1000 Mb/s */
    else
        REG_WRITE(addr, 0x01, 0x0003);

    /*
     * Port Control: disable Core Tag, disable Drop-on-Lock,
     * transmit frames unmodified, disable Header mode,
     * enable IGMP/MLD snoop, disable DoubleTag, disable VLAN
     * tunneling, determine priority by looking at 802.1p and
     * IP priority fields (IP prio has precedence), and set STP
     * state to Forwarding.
     *
     * If this is the upstream port for this switch, enable
     * forwarding of unknown unicasts, and enable DSA tagging
     * mode.
     *
     * If this is the link to another switch, use DSA tagging
     * mode, but do not enable forwarding of unknown unicasts.
     */
    val = 0x0433;
    if (p == dsa_upstream_port(ds)) {
        val |= 0x0104;
        /*
         * On 6085, unknown multicast forward is controlled
         * here rather than in Port Control 2 register.
         */
        if (ps->id == ID_6085)
            val |= 0x0008;
    }
    if (ds->dsa_port_mask & (1 << p))
        val |= 0x0100;
    REG_WRITE(addr, 0x04, val);

    /*
     * Port Control 1: disable trunking.  Also, if this is the
     * CPU port, enable learn messages to be sent to this port.
     */
    REG_WRITE(addr, 0x05, dsa_is_cpu_port(ds, p) ? 0x8000 : 0x0000);

    /*
     * Port based VLAN map: give each port its own address
     * database, allow the CPU port to talk to each of the 'real'
     * ports, and allow each of the 'real' ports to only talk to
     * the upstream port.
     */
    val = (p & 0xf) << 12;
    if (dsa_is_cpu_port(ds, p))
        val |= ds->phys_port_mask;
    else
        val |= 1 << dsa_upstream_port(ds);
    REG_WRITE(addr, 0x06, val);

    /*
     * Default VLAN ID and priority: don't set a default VLAN
     * ID, and set the default packet priority to zero.
     */
    REG_WRITE(addr, 0x07, 0x0000);

    /*
     * Port Control 2: don't force a good FCS, don't use
     * VLAN-based, source address-based or destination
     * address-based priority overrides, don't let the switch
     * add or strip 802.1q tags, don't discard tagged or
     * untagged frames on this port, do a destination address
     * lookup on received packets as usual, don't send a copy
     * of all transmitted/received frames on this port to the
     * CPU, and configure the upstream port number.
     *
     * If this is the upstream port for this switch, enable
     * forwarding of unknown multicast addresses.
     */
    if (ps->id == ID_6085)
        /*
         * on 6085, bits 3:0 are reserved, bit 6 control ARP
         * mirroring, and multicast forward is handled in
         * Port Control register.
         */
        REG_WRITE(addr, 0x08, 0x0080);
    else {
        val = 0x0080 | dsa_upstream_port(ds);
        if (p == dsa_upstream_port(ds))
            val |= 0x0040;
        REG_WRITE(addr, 0x08, val);
    }

    /*
     * Rate Control: disable ingress rate limiting.
     */
    REG_WRITE(addr, 0x09, 0x0000);

    /*
     * Rate Control 2: disable egress rate limiting.
     */
    REG_WRITE(addr, 0x0a, 0x0000);

    /*
     * Port Association Vector: when learning source addresses
     * of packets, add the address to the address database using
     * a port bitmap that has only the bit for this port set and
     * the other bits clear.
     */
    REG_WRITE(addr, 0x0b, 1 << p);

    /*
     * Tag Remap: use an identity 802.1p prio -> switch prio
     * mapping.
     */
    REG_WRITE(addr, 0x18, 0x3210);

    /*
     * Tag Remap 2: use an identity 802.1p prio -> switch prio
     * mapping.
     */
    REG_WRITE(addr, 0x19, 0x7654);

    return 0;
}

static int mv88e6131_setup(struct dsa_switch *ds)
{
    struct mv88e6xxx_priv_state *ps = (void *)(ds + 1);
    int i;
    int ret;

    mutex_init(&ps->smi_mutex);
    mv88e6xxx_ppu_state_init(ds);
    mutex_init(&ps->stats_mutex);

    ps->id = REG_READ(REG_PORT(0), 0x03) & 0xfff0;

    ret = mv88e6131_switch_reset(ds);
    if (ret < 0)
        return ret;

    /* @@@ initialise vtu and atu */

    ret = mv88e6131_setup_global(ds);
    if (ret < 0)
        return ret;

    for (i = 0; i < 11; i++) {
        ret = mv88e6131_setup_port(ds, i);
        if (ret < 0)
            return ret;
    }

    return 0;
}

static int mv88e6131_port_to_phy_addr(int port)
{
    if (port >= 0 && port <= 11)
        return port;
    return -1;
}

static int
mv88e6131_phy_read(struct dsa_switch *ds, int port, int regnum)
{
    int addr = mv88e6131_port_to_phy_addr(port);
    return mv88e6xxx_phy_read_ppu(ds, addr, regnum);
}

static int
mv88e6131_phy_write(struct dsa_switch *ds,
                  int port, int regnum, u16 val)
{
    int addr = mv88e6131_port_to_phy_addr(port);
    return mv88e6xxx_phy_write_ppu(ds, addr, regnum, val);
}

static struct mv88e6xxx_hw_stat mv88e6131_hw_stats[] = {
    { "in_good_octets", 8, 0x00, },
    { "in_bad_octets", 4, 0x02, },
    { "in_unicast", 4, 0x04, },
    { "in_broadcasts", 4, 0x06, },
    { "in_multicasts", 4, 0x07, },
    { "in_pause", 4, 0x16, },
    { "in_undersize", 4, 0x18, },
    { "in_fragments", 4, 0x19, },
    { "in_oversize", 4, 0x1a, },
    { "in_jabber", 4, 0x1b, },
    { "in_rx_error", 4, 0x1c, },
    { "in_fcs_error", 4, 0x1d, },
    { "out_octets", 8, 0x0e, },
    { "out_unicast", 4, 0x10, },
    { "out_broadcasts", 4, 0x13, },
    { "out_multicasts", 4, 0x12, },
    { "out_pause", 4, 0x15, },
    { "excessive", 4, 0x11, },
    { "collisions", 4, 0x1e, },
    { "deferred", 4, 0x05, },
    { "single", 4, 0x14, },
    { "multiple", 4, 0x17, },
    { "out_fcs_error", 4, 0x03, },
    { "late", 4, 0x1f, },
    { "hist_64bytes", 4, 0x08, },
    { "hist_65_127bytes", 4, 0x09, },
    { "hist_128_255bytes", 4, 0x0a, },
    { "hist_256_511bytes", 4, 0x0b, },
    { "hist_512_1023bytes", 4, 0x0c, },
    { "hist_1024_max_bytes", 4, 0x0d, },
};

static void
mv88e6131_get_strings(struct dsa_switch *ds, int port, uint8_t *data)
{
    mv88e6xxx_get_strings(ds, ARRAY_SIZE(mv88e6131_hw_stats),
                  mv88e6131_hw_stats, port, data);
}

static void
mv88e6131_get_ethtool_stats(struct dsa_switch *ds,
                  int port, uint64_t *data)
{
    mv88e6xxx_get_ethtool_stats(ds, ARRAY_SIZE(mv88e6131_hw_stats),
                    mv88e6131_hw_stats, port, data);
}

static int mv88e6131_get_sset_count(struct dsa_switch *ds)
{
    return ARRAY_SIZE(mv88e6131_hw_stats);
}

struct dsa_switch_driver mv88e6131_switch_driver = {
    .tag_protocol       = cpu_to_be16(ETH_P_DSA),
    .priv_size      = sizeof(struct mv88e6xxx_priv_state),
    .probe          = mv88e6131_probe,
    .setup          = mv88e6131_setup,
    .set_addr       = mv88e6xxx_set_addr_direct,
    .phy_read       = mv88e6131_phy_read,
    .phy_write      = mv88e6131_phy_write,
    .poll_link      = mv88e6xxx_poll_link,
    .get_strings        = mv88e6131_get_strings,
    .get_ethtool_stats  = mv88e6131_get_ethtool_stats,
    .get_sset_count     = mv88e6131_get_sset_count,
};

MODULE_ALIAS("platform:mv88e6085");
MODULE_ALIAS("platform:mv88e6095");
MODULE_ALIAS("platform:mv88e6095f");
MODULE_ALIAS("platform:mv88e6131");