drivers/net/dsa/mv88e6352.c - LeafOS-Devices/android_kernel_samsung_gta4xl - Gitiles

 /*
  * net/dsa/mv88e6352.c - Marvell 88e6352 switch chip support
  *
  * Copyright (c) 2014 Guenter Roeck
  *
  * Derived from mv88e6123_61_65.c
  * 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/delay.h>
 #include <linux/jiffies.h>
 #include <linux/list.h>
 #include <linux/module.h>
 #include <linux/netdevice.h>
 #include <linux/platform_device.h>
 #include <linux/phy.h>
 #include <net/dsa.h>
 #include "mv88e6xxx.h"

 static char *mv88e6352_probe(struct device *host_dev, int sw_addr)
 {
 	struct mii_bus *bus = dsa_host_dev_to_mii_bus(host_dev);
 	int ret;

 	if (bus == NULL)
 		return NULL;

 	ret = __mv88e6xxx_reg_read(bus, sw_addr, REG_PORT(0), 0x03);
 	if (ret >= 0) {
 		if ((ret & 0xfff0) == 0x1760)
 			return "Marvell 88E6176";
 		if (ret == 0x3521)
 			return "Marvell 88E6352 (A0)";
 		if (ret == 0x3522)
 			return "Marvell 88E6352 (A1)";
 		if ((ret & 0xfff0) == 0x3520)
 			return "Marvell 88E6352";
 	}

 	return NULL;
 }

 static int mv88e6352_switch_reset(struct dsa_switch *ds)
 {
 	unsigned long timeout;
 	int ret;
 	int i;

 	/* Set all ports to the disabled state. */
 	for (i = 0; i < 7; 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. Keep PPU active (bit 14, undocumented).
 	 * The PPU needs to be active to support indirect phy register
 	 * accesses through global registers 0x18 and 0x19.
 	 */
 	REG_WRITE(REG_GLOBAL, 0x04, 0xc000);

 	/* 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 & 0x8800) == 0x8800)
 			break;
 		usleep_range(1000, 2000);
 	}
 	if (time_after(jiffies, timeout))
 		return -ETIMEDOUT;

 	return 0;
 }

 static int mv88e6352_setup_global(struct dsa_switch *ds)
 {
 	int ret;
 	int i;

 	/* Discard packets with excessive collisions,
 	 * mask all interrupt sources, enable PPU (bit 14, undocumented).
 	 */
 	REG_WRITE(REG_GLOBAL, 0x04, 0x6000);

 	/* 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.
 	 */
 	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 = 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) | 0x7f);

 	/* 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 < 7; 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 mv88e6352_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.
 	 */
 	if (dsa_is_cpu_port(ds, p) || ds->dsa_port_mask & (1 << p))
 		REG_WRITE(addr, 0x01, 0x003e);
 	else
 		REG_WRITE(addr, 0x01, 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 == DSA_TAG_PROTO_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;
 }

 #ifdef CONFIG_NET_DSA_HWMON

 static int mv88e6352_phy_page_read(struct dsa_switch *ds,
 				   int port, int page, int reg)
 {
 	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
 	int ret;

 	mutex_lock(&ps->phy_mutex);
 	ret = mv88e6xxx_phy_write_indirect(ds, port, 0x16, page);
 	if (ret < 0)
 		goto error;
 	ret = mv88e6xxx_phy_read_indirect(ds, port, reg);
 error:
 	mv88e6xxx_phy_write_indirect(ds, port, 0x16, 0x0);
 	mutex_unlock(&ps->phy_mutex);
 	return ret;
 }

 static int mv88e6352_phy_page_write(struct dsa_switch *ds,
 				    int port, int page, int reg, int val)
 {
 	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
 	int ret;

 	mutex_lock(&ps->phy_mutex);
 	ret = mv88e6xxx_phy_write_indirect(ds, port, 0x16, page);
 	if (ret < 0)
 		goto error;

 	ret = mv88e6xxx_phy_write_indirect(ds, port, reg, val);
 error:
 	mv88e6xxx_phy_write_indirect(ds, port, 0x16, 0x0);
 	mutex_unlock(&ps->phy_mutex);
 	return ret;
 }

 static int mv88e6352_get_temp(struct dsa_switch *ds, int *temp)
 {
 	int ret;

 	*temp = 0;

 	ret = mv88e6352_phy_page_read(ds, 0, 6, 27);
 	if (ret < 0)
 		return ret;

 	*temp = (ret & 0xff) - 25;

 	return 0;
 }

 static int mv88e6352_get_temp_limit(struct dsa_switch *ds, int *temp)
 {
 	int ret;

 	*temp = 0;

 	ret = mv88e6352_phy_page_read(ds, 0, 6, 26);
 	if (ret < 0)
 		return ret;

 	*temp = (((ret >> 8) & 0x1f) * 5) - 25;

 	return 0;
 }

 static int mv88e6352_set_temp_limit(struct dsa_switch *ds, int temp)
 {
 	int ret;

 	ret = mv88e6352_phy_page_read(ds, 0, 6, 26);
 	if (ret < 0)
 		return ret;
 	temp = clamp_val(DIV_ROUND_CLOSEST(temp, 5) + 5, 0, 0x1f);
 	return mv88e6352_phy_page_write(ds, 0, 6, 26,
 					(ret & 0xe0ff) | (temp << 8));
 }

 static int mv88e6352_get_temp_alarm(struct dsa_switch *ds, bool *alarm)
 {
 	int ret;

 	*alarm = false;

 	ret = mv88e6352_phy_page_read(ds, 0, 6, 26);
 	if (ret < 0)
 		return ret;

 	*alarm = !!(ret & 0x40);

 	return 0;
 }
 #endif /* CONFIG_NET_DSA_HWMON */

 static int mv88e6352_setup(struct dsa_switch *ds)
 {
 	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
 	int ret;
 	int i;

 	mutex_init(&ps->smi_mutex);
 	mutex_init(&ps->stats_mutex);
 	mutex_init(&ps->phy_mutex);
 	mutex_init(&ps->eeprom_mutex);

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

 	ret = mv88e6352_switch_reset(ds);
 	if (ret < 0)
 		return ret;

 	/* @@@ initialise vtu and atu */

 	ret = mv88e6352_setup_global(ds);
 	if (ret < 0)
 		return ret;

 	for (i = 0; i < 7; i++) {
 		ret = mv88e6352_setup_port(ds, i);
 		if (ret < 0)
 			return ret;
 	}

 	return 0;
 }

 static int mv88e6352_port_to_phy_addr(int port)
 {
 	if (port >= 0 && port <= 4)
 		return port;
 	return -EINVAL;
 }

 static int
 mv88e6352_phy_read(struct dsa_switch *ds, int port, int regnum)
 {
 	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
 	int addr = mv88e6352_port_to_phy_addr(port);
 	int ret;

 	if (addr < 0)
 		return addr;

 	mutex_lock(&ps->phy_mutex);
 	ret = mv88e6xxx_phy_read_indirect(ds, addr, regnum);
 	mutex_unlock(&ps->phy_mutex);

 	return ret;
 }

 static int
 mv88e6352_phy_write(struct dsa_switch *ds, int port, int regnum, u16 val)
 {
 	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
 	int addr = mv88e6352_port_to_phy_addr(port);
 	int ret;

 	if (addr < 0)
 		return addr;

 	mutex_lock(&ps->phy_mutex);
 	ret = mv88e6xxx_phy_write_indirect(ds, addr, regnum, val);
 	mutex_unlock(&ps->phy_mutex);

 	return ret;
 }

 static struct mv88e6xxx_hw_stat mv88e6352_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, },
 	{ "sw_in_discards", 4, 0x110, },
 	{ "sw_in_filtered", 2, 0x112, },
 	{ "sw_out_filtered", 2, 0x113, },
 };

 static int mv88e6352_read_eeprom_word(struct dsa_switch *ds, int addr)
 {
 	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
 	int ret;

 	mutex_lock(&ps->eeprom_mutex);

 	ret = mv88e6xxx_reg_write(ds, REG_GLOBAL2, 0x14,
 				  0xc000 | (addr & 0xff));
 	if (ret < 0)
 		goto error;

 	ret = mv88e6xxx_eeprom_busy_wait(ds);
 	if (ret < 0)
 		goto error;

 	ret = mv88e6xxx_reg_read(ds, REG_GLOBAL2, 0x15);
 error:
 	mutex_unlock(&ps->eeprom_mutex);
 	return ret;
 }

 static int mv88e6352_get_eeprom(struct dsa_switch *ds,
 				struct ethtool_eeprom *eeprom, u8 *data)
 {
 	int offset;
 	int len;
 	int ret;

 	offset = eeprom->offset;
 	len = eeprom->len;
 	eeprom->len = 0;

 	eeprom->magic = 0xc3ec4951;

 	ret = mv88e6xxx_eeprom_load_wait(ds);
 	if (ret < 0)
 		return ret;

 	if (offset & 1) {
 		int word;

 		word = mv88e6352_read_eeprom_word(ds, offset >> 1);
 		if (word < 0)
 			return word;

 		*data++ = (word >> 8) & 0xff;

 		offset++;
 		len--;
 		eeprom->len++;
 	}

 	while (len >= 2) {
 		int word;

 		word = mv88e6352_read_eeprom_word(ds, offset >> 1);
 		if (word < 0)
 			return word;

 		*data++ = word & 0xff;
 		*data++ = (word >> 8) & 0xff;

 		offset += 2;
 		len -= 2;
 		eeprom->len += 2;
 	}

 	if (len) {
 		int word;

 		word = mv88e6352_read_eeprom_word(ds, offset >> 1);
 		if (word < 0)
 			return word;

 		*data++ = word & 0xff;

 		offset++;
 		len--;
 		eeprom->len++;
 	}

 	return 0;
 }

 static int mv88e6352_eeprom_is_readonly(struct dsa_switch *ds)
 {
 	int ret;

 	ret = mv88e6xxx_reg_read(ds, REG_GLOBAL2, 0x14);
 	if (ret < 0)
 		return ret;

 	if (!(ret & 0x0400))
 		return -EROFS;

 	return 0;
 }

 static int mv88e6352_write_eeprom_word(struct dsa_switch *ds, int addr,
 				       u16 data)
 {
 	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
 	int ret;

 	mutex_lock(&ps->eeprom_mutex);

 	ret = mv88e6xxx_reg_write(ds, REG_GLOBAL2, 0x15, data);
 	if (ret < 0)
 		goto error;

 	ret = mv88e6xxx_reg_write(ds, REG_GLOBAL2, 0x14,
 				  0xb000 | (addr & 0xff));
 	if (ret < 0)
 		goto error;

 	ret = mv88e6xxx_eeprom_busy_wait(ds);
 error:
 	mutex_unlock(&ps->eeprom_mutex);
 	return ret;
 }

 static int mv88e6352_set_eeprom(struct dsa_switch *ds,
 				struct ethtool_eeprom *eeprom, u8 *data)
 {
 	int offset;
 	int ret;
 	int len;

 	if (eeprom->magic != 0xc3ec4951)
 		return -EINVAL;

 	ret = mv88e6352_eeprom_is_readonly(ds);
 	if (ret)
 		return ret;

 	offset = eeprom->offset;
 	len = eeprom->len;
 	eeprom->len = 0;

 	ret = mv88e6xxx_eeprom_load_wait(ds);
 	if (ret < 0)
 		return ret;

 	if (offset & 1) {
 		int word;

 		word = mv88e6352_read_eeprom_word(ds, offset >> 1);
 		if (word < 0)
 			return word;

 		word = (*data++ << 8) | (word & 0xff);

 		ret = mv88e6352_write_eeprom_word(ds, offset >> 1, word);
 		if (ret < 0)
 			return ret;

 		offset++;
 		len--;
 		eeprom->len++;
 	}

 	while (len >= 2) {
 		int word;

 		word = *data++;
 		word |= *data++ << 8;

 		ret = mv88e6352_write_eeprom_word(ds, offset >> 1, word);
 		if (ret < 0)
 			return ret;

 		offset += 2;
 		len -= 2;
 		eeprom->len += 2;
 	}

 	if (len) {
 		int word;

 		word = mv88e6352_read_eeprom_word(ds, offset >> 1);
 		if (word < 0)
 			return word;

 		word = (word & 0xff00) | *data++;

 		ret = mv88e6352_write_eeprom_word(ds, offset >> 1, word);
 		if (ret < 0)
 			return ret;

 		offset++;
 		len--;
 		eeprom->len++;
 	}

 	return 0;
 }

 static void
 mv88e6352_get_strings(struct dsa_switch *ds, int port, uint8_t *data)
 {
 	mv88e6xxx_get_strings(ds, ARRAY_SIZE(mv88e6352_hw_stats),
 			      mv88e6352_hw_stats, port, data);
 }

 static void
 mv88e6352_get_ethtool_stats(struct dsa_switch *ds, int port, uint64_t *data)
 {
 	mv88e6xxx_get_ethtool_stats(ds, ARRAY_SIZE(mv88e6352_hw_stats),
 				    mv88e6352_hw_stats, port, data);
 }

 static int mv88e6352_get_sset_count(struct dsa_switch *ds)
 {
 	return ARRAY_SIZE(mv88e6352_hw_stats);
 }

 struct dsa_switch_driver mv88e6352_switch_driver = {
 	.tag_protocol		= DSA_TAG_PROTO_EDSA,
 	.priv_size		= sizeof(struct mv88e6xxx_priv_state),
 	.probe			= mv88e6352_probe,
 	.setup			= mv88e6352_setup,
 	.set_addr		= mv88e6xxx_set_addr_indirect,
 	.phy_read		= mv88e6352_phy_read,
 	.phy_write		= mv88e6352_phy_write,
 	.poll_link		= mv88e6xxx_poll_link,
 	.get_strings		= mv88e6352_get_strings,
 	.get_ethtool_stats	= mv88e6352_get_ethtool_stats,
 	.get_sset_count		= mv88e6352_get_sset_count,
 	.set_eee		= mv88e6xxx_set_eee,
 	.get_eee		= mv88e6xxx_get_eee,
 #ifdef CONFIG_NET_DSA_HWMON
 	.get_temp		= mv88e6352_get_temp,
 	.get_temp_limit		= mv88e6352_get_temp_limit,
 	.set_temp_limit		= mv88e6352_set_temp_limit,
 	.get_temp_alarm		= mv88e6352_get_temp_alarm,
 #endif
 	.get_eeprom		= mv88e6352_get_eeprom,
 	.set_eeprom		= mv88e6352_set_eeprom,
 	.get_regs_len		= mv88e6xxx_get_regs_len,
 	.get_regs		= mv88e6xxx_get_regs,
 };

 MODULE_ALIAS("platform:mv88e6352");
	/*
	* net/dsa/mv88e6352.c - Marvell 88e6352 switch chip support
	*
	* Copyright (c) 2014 Guenter Roeck
	*
	* Derived from mv88e6123_61_65.c
	* 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/delay.h>
	#include <linux/jiffies.h>
	#include <linux/list.h>
	#include <linux/module.h>
	#include <linux/netdevice.h>
	#include <linux/platform_device.h>
	#include <linux/phy.h>
	#include <net/dsa.h>
	#include "mv88e6xxx.h"

	static char mv88e6352_probe(struct device host_dev, int sw_addr)
	{
	struct mii_bus *bus = dsa_host_dev_to_mii_bus(host_dev);
	int ret;

	if (bus == NULL)
	return NULL;

	ret = __mv88e6xxx_reg_read(bus, sw_addr, REG_PORT(0), 0x03);
	if (ret >= 0) {
	if ((ret & 0xfff0) == 0x1760)
	return "Marvell 88E6176";
	if (ret == 0x3521)
	return "Marvell 88E6352 (A0)";
	if (ret == 0x3522)
	return "Marvell 88E6352 (A1)";
	if ((ret & 0xfff0) == 0x3520)
	return "Marvell 88E6352";
	}

	return NULL;
	}

	static int mv88e6352_switch_reset(struct dsa_switch *ds)
	{
	unsigned long timeout;
	int ret;
	int i;

	/* Set all ports to the disabled state. */
	for (i = 0; i < 7; 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. Keep PPU active (bit 14, undocumented).
	* The PPU needs to be active to support indirect phy register
	* accesses through global registers 0x18 and 0x19.
	*/
	REG_WRITE(REG_GLOBAL, 0x04, 0xc000);

	/* 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 & 0x8800) == 0x8800)
	break;
	usleep_range(1000, 2000);
	}
	if (time_after(jiffies, timeout))
	return -ETIMEDOUT;

	return 0;
	}

	static int mv88e6352_setup_global(struct dsa_switch *ds)
	{
	int ret;
	int i;

	/* Discard packets with excessive collisions,
	* mask all interrupt sources, enable PPU (bit 14, undocumented).
	*/
	REG_WRITE(REG_GLOBAL, 0x04, 0x6000);

	/* 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.
	*/
	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 = 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) \| 0x7f);

	/* 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 < 7; 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 mv88e6352_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.
	*/
	if (dsa_is_cpu_port(ds, p) \|\| ds->dsa_port_mask & (1 << p))
	REG_WRITE(addr, 0x01, 0x003e);
	else
	REG_WRITE(addr, 0x01, 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 == DSA_TAG_PROTO_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;
	}

	#ifdef CONFIG_NET_DSA_HWMON

	static int mv88e6352_phy_page_read(struct dsa_switch *ds,
	int port, int page, int reg)
	{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
	int ret;

	mutex_lock(&ps->phy_mutex);
	ret = mv88e6xxx_phy_write_indirect(ds, port, 0x16, page);
	if (ret < 0)
	goto error;
	ret = mv88e6xxx_phy_read_indirect(ds, port, reg);
	error:
	mv88e6xxx_phy_write_indirect(ds, port, 0x16, 0x0);
	mutex_unlock(&ps->phy_mutex);
	return ret;
	}

	static int mv88e6352_phy_page_write(struct dsa_switch *ds,
	int port, int page, int reg, int val)
	{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
	int ret;

	mutex_lock(&ps->phy_mutex);
	ret = mv88e6xxx_phy_write_indirect(ds, port, 0x16, page);
	if (ret < 0)
	goto error;

	ret = mv88e6xxx_phy_write_indirect(ds, port, reg, val);
	error:
	mv88e6xxx_phy_write_indirect(ds, port, 0x16, 0x0);
	mutex_unlock(&ps->phy_mutex);
	return ret;
	}

	static int mv88e6352_get_temp(struct dsa_switch ds, int temp)
	{
	int ret;

	*temp = 0;

	ret = mv88e6352_phy_page_read(ds, 0, 6, 27);
	if (ret < 0)
	return ret;

	*temp = (ret & 0xff) - 25;

	return 0;
	}

	static int mv88e6352_get_temp_limit(struct dsa_switch ds, int temp)
	{
	int ret;

	*temp = 0;

	ret = mv88e6352_phy_page_read(ds, 0, 6, 26);
	if (ret < 0)
	return ret;

	temp = (((ret >> 8) & 0x1f) 5) - 25;

	return 0;
	}

	static int mv88e6352_set_temp_limit(struct dsa_switch *ds, int temp)
	{
	int ret;

	ret = mv88e6352_phy_page_read(ds, 0, 6, 26);
	if (ret < 0)
	return ret;
	temp = clamp_val(DIV_ROUND_CLOSEST(temp, 5) + 5, 0, 0x1f);
	return mv88e6352_phy_page_write(ds, 0, 6, 26,
	(ret & 0xe0ff) \| (temp << 8));
	}

	static int mv88e6352_get_temp_alarm(struct dsa_switch ds, bool alarm)
	{
	int ret;

	*alarm = false;

	ret = mv88e6352_phy_page_read(ds, 0, 6, 26);
	if (ret < 0)
	return ret;

	*alarm = !!(ret & 0x40);

	return 0;
	}
	#endif /* CONFIG_NET_DSA_HWMON */

	static int mv88e6352_setup(struct dsa_switch *ds)
	{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
	int ret;
	int i;

	mutex_init(&ps->smi_mutex);
	mutex_init(&ps->stats_mutex);
	mutex_init(&ps->phy_mutex);
	mutex_init(&ps->eeprom_mutex);

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

	ret = mv88e6352_switch_reset(ds);
	if (ret < 0)
	return ret;

	/* @@@ initialise vtu and atu */

	ret = mv88e6352_setup_global(ds);
	if (ret < 0)
	return ret;

	for (i = 0; i < 7; i++) {
	ret = mv88e6352_setup_port(ds, i);
	if (ret < 0)
	return ret;
	}

	return 0;
	}

	static int mv88e6352_port_to_phy_addr(int port)
	{
	if (port >= 0 && port <= 4)
	return port;
	return -EINVAL;
	}

	static int
	mv88e6352_phy_read(struct dsa_switch *ds, int port, int regnum)
	{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
	int addr = mv88e6352_port_to_phy_addr(port);
	int ret;

	if (addr < 0)
	return addr;

	mutex_lock(&ps->phy_mutex);
	ret = mv88e6xxx_phy_read_indirect(ds, addr, regnum);
	mutex_unlock(&ps->phy_mutex);

	return ret;
	}

	static int
	mv88e6352_phy_write(struct dsa_switch *ds, int port, int regnum, u16 val)
	{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
	int addr = mv88e6352_port_to_phy_addr(port);
	int ret;

	if (addr < 0)
	return addr;

	mutex_lock(&ps->phy_mutex);
	ret = mv88e6xxx_phy_write_indirect(ds, addr, regnum, val);
	mutex_unlock(&ps->phy_mutex);

	return ret;
	}

	static struct mv88e6xxx_hw_stat mv88e6352_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, },
	{ "sw_in_discards", 4, 0x110, },
	{ "sw_in_filtered", 2, 0x112, },
	{ "sw_out_filtered", 2, 0x113, },
	};

	static int mv88e6352_read_eeprom_word(struct dsa_switch *ds, int addr)
	{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
	int ret;

	mutex_lock(&ps->eeprom_mutex);

	ret = mv88e6xxx_reg_write(ds, REG_GLOBAL2, 0x14,
	0xc000 \| (addr & 0xff));
	if (ret < 0)
	goto error;

	ret = mv88e6xxx_eeprom_busy_wait(ds);
	if (ret < 0)
	goto error;

	ret = mv88e6xxx_reg_read(ds, REG_GLOBAL2, 0x15);
	error:
	mutex_unlock(&ps->eeprom_mutex);
	return ret;
	}

	static int mv88e6352_get_eeprom(struct dsa_switch *ds,
	struct ethtool_eeprom eeprom, u8 data)
	{
	int offset;
	int len;
	int ret;

	offset = eeprom->offset;
	len = eeprom->len;
	eeprom->len = 0;

	eeprom->magic = 0xc3ec4951;

	ret = mv88e6xxx_eeprom_load_wait(ds);
	if (ret < 0)
	return ret;

	if (offset & 1) {
	int word;

	word = mv88e6352_read_eeprom_word(ds, offset >> 1);
	if (word < 0)
	return word;

	*data++ = (word >> 8) & 0xff;

	offset++;
	len--;
	eeprom->len++;
	}

	while (len >= 2) {
	int word;

	word = mv88e6352_read_eeprom_word(ds, offset >> 1);
	if (word < 0)
	return word;

	*data++ = word & 0xff;
	*data++ = (word >> 8) & 0xff;

	offset += 2;
	len -= 2;
	eeprom->len += 2;
	}

	if (len) {
	int word;

	word = mv88e6352_read_eeprom_word(ds, offset >> 1);
	if (word < 0)
	return word;

	*data++ = word & 0xff;

	offset++;
	len--;
	eeprom->len++;
	}

	return 0;
	}

	static int mv88e6352_eeprom_is_readonly(struct dsa_switch *ds)
	{
	int ret;

	ret = mv88e6xxx_reg_read(ds, REG_GLOBAL2, 0x14);
	if (ret < 0)
	return ret;

	if (!(ret & 0x0400))
	return -EROFS;

	return 0;
	}

	static int mv88e6352_write_eeprom_word(struct dsa_switch *ds, int addr,
	u16 data)
	{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
	int ret;

	mutex_lock(&ps->eeprom_mutex);

	ret = mv88e6xxx_reg_write(ds, REG_GLOBAL2, 0x15, data);
	if (ret < 0)
	goto error;

	ret = mv88e6xxx_reg_write(ds, REG_GLOBAL2, 0x14,
	0xb000 \| (addr & 0xff));
	if (ret < 0)
	goto error;

	ret = mv88e6xxx_eeprom_busy_wait(ds);
	error:
	mutex_unlock(&ps->eeprom_mutex);
	return ret;
	}

	static int mv88e6352_set_eeprom(struct dsa_switch *ds,
	struct ethtool_eeprom eeprom, u8 data)
	{
	int offset;
	int ret;
	int len;

	if (eeprom->magic != 0xc3ec4951)
	return -EINVAL;

	ret = mv88e6352_eeprom_is_readonly(ds);
	if (ret)
	return ret;

	offset = eeprom->offset;
	len = eeprom->len;
	eeprom->len = 0;

	ret = mv88e6xxx_eeprom_load_wait(ds);
	if (ret < 0)
	return ret;

	if (offset & 1) {
	int word;

	word = mv88e6352_read_eeprom_word(ds, offset >> 1);
	if (word < 0)
	return word;

	word = (*data++ << 8) \| (word & 0xff);

	ret = mv88e6352_write_eeprom_word(ds, offset >> 1, word);
	if (ret < 0)
	return ret;

	offset++;
	len--;
	eeprom->len++;
	}

	while (len >= 2) {
	int word;

	word = *data++;
	word \|= *data++ << 8;

	ret = mv88e6352_write_eeprom_word(ds, offset >> 1, word);
	if (ret < 0)
	return ret;

	offset += 2;
	len -= 2;
	eeprom->len += 2;
	}

	if (len) {
	int word;

	word = mv88e6352_read_eeprom_word(ds, offset >> 1);
	if (word < 0)
	return word;

	word = (word & 0xff00) \| *data++;

	ret = mv88e6352_write_eeprom_word(ds, offset >> 1, word);
	if (ret < 0)
	return ret;

	offset++;
	len--;
	eeprom->len++;
	}

	return 0;
	}

	static void
	mv88e6352_get_strings(struct dsa_switch ds, int port, uint8_t data)
	{
	mv88e6xxx_get_strings(ds, ARRAY_SIZE(mv88e6352_hw_stats),
	mv88e6352_hw_stats, port, data);
	}

	static void
	mv88e6352_get_ethtool_stats(struct dsa_switch ds, int port, uint64_t data)
	{
	mv88e6xxx_get_ethtool_stats(ds, ARRAY_SIZE(mv88e6352_hw_stats),
	mv88e6352_hw_stats, port, data);
	}

	static int mv88e6352_get_sset_count(struct dsa_switch *ds)
	{
	return ARRAY_SIZE(mv88e6352_hw_stats);
	}

	struct dsa_switch_driver mv88e6352_switch_driver = {
	.tag_protocol = DSA_TAG_PROTO_EDSA,
	.priv_size = sizeof(struct mv88e6xxx_priv_state),
	.probe = mv88e6352_probe,
	.setup = mv88e6352_setup,
	.set_addr = mv88e6xxx_set_addr_indirect,
	.phy_read = mv88e6352_phy_read,
	.phy_write = mv88e6352_phy_write,
	.poll_link = mv88e6xxx_poll_link,
	.get_strings = mv88e6352_get_strings,
	.get_ethtool_stats = mv88e6352_get_ethtool_stats,
	.get_sset_count = mv88e6352_get_sset_count,
	.set_eee = mv88e6xxx_set_eee,
	.get_eee = mv88e6xxx_get_eee,
	#ifdef CONFIG_NET_DSA_HWMON
	.get_temp = mv88e6352_get_temp,
	.get_temp_limit = mv88e6352_get_temp_limit,
	.set_temp_limit = mv88e6352_set_temp_limit,
	.get_temp_alarm = mv88e6352_get_temp_alarm,
	#endif
	.get_eeprom = mv88e6352_get_eeprom,
	.set_eeprom = mv88e6352_set_eeprom,
	.get_regs_len = mv88e6xxx_get_regs_len,
	.get_regs = mv88e6xxx_get_regs,
	};

	MODULE_ALIAS("platform:mv88e6352");