net: DSA: Marvell mv88e6171 switch driver

This is the Marvell driver with some cleanups by Claudio Leite
and myself.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Cc: Claudio Leite <leitec@staticky.com>
Signed-off-by: Claudio Leite <leitec@staticky.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 407 insertions, 0 deletions

diff --git a/drivers/net/dsa/mv88e6171.c b/drivers/net/dsa/mv88e6171.c
new file mode 100644
index 000000000000..03a70069a8c6
--- /dev/null
+++ b/drivers/net/dsa/mv88e6171.c
@@ -0,0 +1,407 @@
+/* net/dsa/mv88e6171.c - Marvell 88e6171 switch chip support
+ * Copyright (c) 2008-2009 Marvell Semiconductor
+ * Copyright (c) 2014 Claudio Leite <leitec@staticky.com>
+ *
+ * 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/delay.h>
+#include <linux/jiffies.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/phy.h>
+#include <net/dsa.h>
+#include "mv88e6xxx.h"
+
+static char *mv88e6171_probe(struct mii_bus *bus, int sw_addr)
+{
+	int ret;
+
+	ret = __mv88e6xxx_reg_read(bus, sw_addr, REG_PORT(0), 0x03);
+	if (ret >= 0) {
+		if ((ret & 0xfff0) == 0x1710)
+			return "Marvell 88E6171";
+	}
+
+	return NULL;
+}
+
+static int mv88e6171_switch_reset(struct dsa_switch *ds)
+{
+	int i;
+	int ret;
+	unsigned long timeout;
+
+	/* 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. */
+	usleep_range(2000, 4000);
+
+	/* Reset the switch. */
+	REG_WRITE(REG_GLOBAL, 0x04, 0xc400);
+
+	/* Wait up to one second for reset to complete. */
+	timeout = jiffies + 1 * HZ;
+	while (time_before(jiffies, timeout)) {
+		ret = REG_READ(REG_GLOBAL, 0x00);
+		if ((ret & 0xc800) == 0xc800)
+			break;
+
+		usleep_range(1000, 2000);
+	}
+	if (time_after(jiffies, timeout))
+		return -ETIMEDOUT;
+
+	/* Enable ports not under DSA, e.g. WAN port */
+	for (i = 0; i < 8; i++) {
+		if (dsa_is_cpu_port(ds, i) || ds->phys_port_mask & (1 << i))
+			continue;
+
+		ret = REG_READ(REG_PORT(i), 0x04);
+		REG_WRITE(REG_PORT(i), 0x04, ret | 0x03);
+	}
+
+	return 0;
+}
+
+static int mv88e6171_setup_global(struct dsa_switch *ds)
+{
+	int ret;
+	int i;
+
+	/* Disable the PHY polling unit (since there won't be any
+	 * external PHYs to poll), don't discard packets with
+	 * excessive collisions, and mask all interrupt sources.
+	 */
+	REG_WRITE(REG_GLOBAL, 0x04, 0x0000);
+
+	/* 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;
+
+	/* Configure the upstream port, and configure the upstream
+	 * port as the port to which ingress and egress monitor frames
+	 * are to be sent.
+	 */
+	if (REG_READ(REG_PORT(0), 0x03) == 0x1710)
+		REG_WRITE(REG_GLOBAL, 0x1a, (dsa_upstream_port(ds) * 0x1111));
+	else
+		REG_WRITE(REG_GLOBAL, 0x1a, (dsa_upstream_port(ds) * 0x1110));
+
+	/* Disable remote management for now, and set the switch's
+	 * DSA device number.
+	 */
+	REG_WRITE(REG_GLOBAL, 0x1c, ds->index & 0x1f);
+
+	/* Send all frames with destination addresses matching
+	 * 01:80:c2:00:00:2x to the CPU port.
+	 */
+	REG_WRITE(REG_GLOBAL2, 0x02, 0xffff);
+
+	/* Send all frames with destination addresses matching
+	 * 01:80:c2:00:00:0x to the CPU port.
+	 */
+	REG_WRITE(REG_GLOBAL2, 0x03, 0xffff);
+
+	/* Disable the loopback filter, disable flow control
+	 * messages, disable flood broadcast override, disable
+	 * removing of provider tags, disable ATU age violation
+	 * interrupts, disable tag flow control, force flow
+	 * control priority to the highest, and send all special
+	 * multicast frames to the CPU 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) | 0xff);
+
+	/* Clear all trunk mappings. */
+	for (i = 0; i < 16; i++)
+		REG_WRITE(REG_GLOBAL2, 0x08, 0x8000 | (i << 11));
+
+	/* Disable ingress rate limiting by resetting all ingress
+	 * rate limit registers to their initial state.
+	 */
+	for (i = 0; i < 6; i++)
+		REG_WRITE(REG_GLOBAL2, 0x09, 0x9000 | (i << 8));
+
+	/* Initialise cross-chip port VLAN table to reset defaults. */
+	REG_WRITE(REG_GLOBAL2, 0x0b, 0x9000);
+
+	/* Clear the priority override table. */
+	for (i = 0; i < 16; i++)
+		REG_WRITE(REG_GLOBAL2, 0x0f, 0x8000 | (i << 8));
+
+	/* @@@ initialise AVB (22/23) watchdog (27) sdet (29) registers */
+
+	return 0;
+}
+
+static int mv88e6171_setup_port(struct dsa_switch *ds, int p)
+{
+	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
+	 * full duplex.
+	 */
+	val = REG_READ(addr, 0x01);
+	if (dsa_is_cpu_port(ds, p) || ds->dsa_port_mask & (1 << p))
+		REG_WRITE(addr, 0x01, val | 0x003e);
+	else
+		REG_WRITE(addr, 0x01, val | 0x0003);
+
+	/* Do not limit the period of time that this port can be
+	 * paused for by the remote end or the period of time that
+	 * this port can pause the remote end.
+	 */
+	REG_WRITE(addr, 0x02, 0x0000);
+
+	/* Port Control: disable Drop-on-Unlock, disable Drop-on-Lock,
+	 * disable Header mode, enable IGMP/MLD snooping, 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 CPU link, use DSA or EDSA tagging depending
+	 * on which tagging mode was configured.
+	 *
+	 * If this is a link to another switch, use DSA tagging mode.
+	 *
+	 * If this is the upstream port for this switch, enable
+	 * forwarding of unknown unicasts and multicasts.
+	 */
+	val = 0x0433;
+	if (dsa_is_cpu_port(ds, p)) {
+		if (ds->dst->tag_protocol == htons(ETH_P_EDSA))
+			val |= 0x3300;
+		else
+			val |= 0x0100;
+	}
+	if (ds->dsa_port_mask & (1 << p))
+		val |= 0x0100;
+	if (p == dsa_upstream_port(ds))
+		val |= 0x000c;
+	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, set the maximum
+	 * frame size to 10240 bytes, 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 all
+	 * received packets as usual, disable ARP mirroring and don't
+	 * send a copy of all transmitted/received frames on this port
+	 * to the CPU.
+	 */
+	REG_WRITE(addr, 0x08, 0x2080);
+
+	/* Egress rate control: disable egress rate control. */
+	REG_WRITE(addr, 0x09, 0x0001);
+
+	/* Egress rate control 2: disable egress rate control. */
+	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);
+
+	/* Port ATU control: disable limiting the number of address
+	 * database entries that this port is allowed to use.
+	 */
+	REG_WRITE(addr, 0x0c, 0x0000);
+
+	/* Priority Override: disable DA, SA and VTU priority override. */
+	REG_WRITE(addr, 0x0d, 0x0000);
+
+	/* Port Ethertype: use the Ethertype DSA Ethertype value. */
+	REG_WRITE(addr, 0x0f, ETH_P_EDSA);
+
+	/* 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 mv88e6171_setup(struct dsa_switch *ds)
+{
+	struct mv88e6xxx_priv_state *ps = (void *)(ds + 1);
+	int i;
+	int ret;
+
+	mutex_init(&ps->smi_mutex);
+	mutex_init(&ps->stats_mutex);
+
+	ret = mv88e6171_switch_reset(ds);
+	if (ret < 0)
+		return ret;
+
+	/* @@@ initialise vtu and atu */
+
+	ret = mv88e6171_setup_global(ds);
+	if (ret < 0)
+		return ret;
+
+	for (i = 0; i < 8; i++) {
+		if (!(dsa_is_cpu_port(ds, i) || ds->phys_port_mask & (1 << i)))
+			continue;
+
+		ret = mv88e6171_setup_port(ds, i);
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int mv88e6171_port_to_phy_addr(int port)
+{
+	if (port >= 0 && port <= 4)
+		return port;
+	return -1;
+}
+
+static int
+mv88e6171_phy_read(struct dsa_switch *ds, int port, int regnum)
+{
+	int addr = mv88e6171_port_to_phy_addr(port);
+
+	return mv88e6xxx_phy_read(ds, addr, regnum);
+}
+
+static int
+mv88e6171_phy_write(struct dsa_switch *ds,
+		    int port, int regnum, u16 val)
+{
+	int addr = mv88e6171_port_to_phy_addr(port);
+
+	return mv88e6xxx_phy_write(ds, addr, regnum, val);
+}
+
+static struct mv88e6xxx_hw_stat mv88e6171_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
+mv88e6171_get_strings(struct dsa_switch *ds, int port, uint8_t *data)
+{
+	mv88e6xxx_get_strings(ds, ARRAY_SIZE(mv88e6171_hw_stats),
+			      mv88e6171_hw_stats, port, data);
+}
+
+static void
+mv88e6171_get_ethtool_stats(struct dsa_switch *ds,
+			    int port, uint64_t *data)
+{
+	mv88e6xxx_get_ethtool_stats(ds, ARRAY_SIZE(mv88e6171_hw_stats),
+				    mv88e6171_hw_stats, port, data);
+}
+
+static int mv88e6171_get_sset_count(struct dsa_switch *ds)
+{
+	return ARRAY_SIZE(mv88e6171_hw_stats);
+}
+
+struct dsa_switch_driver mv88e6171_switch_driver = {
+	.tag_protocol		= DSA_TAG_PROTO_DSA,
+	.priv_size		= sizeof(struct mv88e6xxx_priv_state),
+	.probe			= mv88e6171_probe,
+	.setup			= mv88e6171_setup,
+	.set_addr		= mv88e6xxx_set_addr_indirect,
+	.phy_read		= mv88e6171_phy_read,
+	.phy_write		= mv88e6171_phy_write,
+	.poll_link		= mv88e6xxx_poll_link,
+	.get_strings		= mv88e6171_get_strings,
+	.get_ethtool_stats	= mv88e6171_get_ethtool_stats,
+	.get_sset_count		= mv88e6171_get_sset_count,
+};
+
+MODULE_ALIAS("platform:mv88e6171");