dsa: add support for the Marvell 88E6131 switch chip

Add support for the Marvell 88E6131 switch chip.  This chip only
supports the original (ethertype-less) DSA tagging format.

On the 88E6131, there is a PHY Polling Unit (PPU) which has exclusive
access to each of the PHYs's MII management registers.  If we want to
talk to the PHYs from software, we have to disable the PPU and wait
for it to complete its current transaction before we can do so, and we
need to re-enable the PPU afterwards to make sure that the switch will
notice changes in link state and speed on the individual ports as they
occur.

Since disabling the PPU is rather slow, and since MII management
accesses are typically done in bursts, this patch keeps the PPU disabled
for 10ms after a software access completes.  This makes handling the
PPU slightly more complex, but speeds up something like running ethtool
on one of the switch slave interfaces from ~300ms to ~30ms on typical
hardware.

Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Tested-by: Nicolas Pitre <nico@marvell.com>
Tested-by: Peter van Valderen <linux@ddcrew.com>
Tested-by: Dirk Teurlings <dirk@upexia.nl>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 380 insertions, 0 deletions

diff --git a/net/dsa/mv88e6131.c b/net/dsa/mv88e6131.c
new file mode 100644
index 000000000000..36e01eb863a0
--- /dev/null
+++ b/net/dsa/mv88e6131.c
@@ -0,0 +1,380 @@
+/*
+ * net/dsa/mv88e6131.c - Marvell 88e6131 switch chip support
+ * Copyright (c) 2008 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/netdevice.h>
+#include <linux/phy.h>
+#include "dsa_priv.h"
+#include "mv88e6xxx.h"
+
+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 == 0x1060)
+                        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 < 8; 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 cpu port as the
+         * port to which ingress and egress monitor frames are to be
+         * sent.
+         */
+        REG_WRITE(REG_GLOBAL, 0x1a, (ds->cpu_port * 0x1100) | 0x00f0);
+
+        /*
+         * Disable cascade port functionality, and set the switch's
+         * DSA device number to zero.
+         */
+        REG_WRITE(REG_GLOBAL, 0x1c, 0xe000);
+
+        /*
+         * 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 higest priority.
+         */
+        REG_WRITE(REG_GLOBAL2, 0x05, 0x00ff);
+
+        /*
+         * Map all DSA device IDs to the CPU port.
+         */
+        for (i = 0; i < 32; i++)
+                REG_WRITE(REG_GLOBAL2, 0x06, 0x8000 | (i << 8) | ds->cpu_port);
+
+        /*
+         * Clear all trunk masks.
+         */
+        for (i = 0; i < 8; i++)
+                REG_WRITE(REG_GLOBAL2, 0x07, 0x8000 | (i << 12) | 0xff);
+
+        /*
+         * 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)
+{
+        int addr = REG_PORT(p);
+
+        /*
+         * MAC Forcing register: don't force link, speed, duplex
+         * or flow control state to any particular values.
+         */
+        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.  Finally, if this is the CPU port,
+         * additionally enable DSA tagging and forwarding of unknown
+         * unicast addresses.
+         */
+        REG_WRITE(addr, 0x04, (p == ds->cpu_port) ? 0x0537 : 0x0433);
+
+        /*
+         * 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, (p == ds->cpu_port) ? 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 CPU port.
+         */
+        REG_WRITE(addr, 0x06,
+                        ((p & 0xf) << 12) |
+                         ((p == ds->cpu_port) ?
+                                ds->valid_port_mask :
+                                (1 << ds->cpu_port)));
+
+        /*
+         * 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 CPU port number.  Also, if this
+         * is the CPU port, enable forwarding of unknown multicast
+         * addresses.
+         */
+        REG_WRITE(addr, 0x08,
+                        ((p == ds->cpu_port) ? 0x00c0 : 0x0080) |
+                         ds->cpu_port);
+
+        /*
+         * 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);
+
+        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 < 6; 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 != 3 && port <= 7)
+                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);
+}
+
+static struct dsa_switch_driver mv88e6131_switch_driver = {
+        .tag_protocol           = __constant_htons(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,
+};
+
+int __init mv88e6131_init(void)
+{
+        register_switch_driver(&mv88e6131_switch_driver);
+        return 0;
+}
+module_init(mv88e6131_init);
+
+void __exit mv88e6131_cleanup(void)
+{
+        unregister_switch_driver(&mv88e6131_switch_driver);
+}
+module_exit(mv88e6131_cleanup);