Commit 55ab6ffa authored by Arun Ramadoss's avatar Arun Ramadoss Committed by David S. Miller
Browse files

net: dsa: microchip: add DSA support for microchip LAN937x 



Basic DSA driver support for lan937x and the device will be
configured through SPI interface.
It adds the lan937x_dev_ops in ksz_common.c file and tries to reuse the
functionality of ksz9477 series switch.

drivers/net/dsa/microchip/ path is already part of MAINTAINERS &
the new files come under this path. Hence no update needed to the
MAINTAINERS

Signed-off-by: default avatarArun Ramadoss <arun.ramadoss@microchip.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 457c182a

drivers/net/dsa/microchip/Kconfig

+1 −1
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# SPDX-License-Identifier: GPL-2.0-only

menuconfig NET_DSA_MICROCHIP_KSZ_COMMON

	tristate "Microchip KSZ8795/KSZ9477 series switch support"

	tristate "Microchip KSZ8795/KSZ9477/LAN937x series switch support"

	depends on NET_DSA

	select NET_DSA_TAG_KSZ

	help

drivers/net/dsa/microchip/Makefile

+1 −0
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@@ -3,6 +3,7 @@ obj-$(CONFIG_NET_DSA_MICROCHIP_KSZ_COMMON) += ksz_switch.o 
ksz_switch-objs := ksz_common.o

ksz_switch-objs += ksz9477.o

ksz_switch-objs += ksz8795.o

ksz_switch-objs += lan937x_main.o

obj-$(CONFIG_NET_DSA_MICROCHIP_KSZ9477_I2C)	+= ksz9477_i2c.o

obj-$(CONFIG_NET_DSA_MICROCHIP_KSZ_SPI)		+= ksz_spi.o

obj-$(CONFIG_NET_DSA_MICROCHIP_KSZ8863_SMI)	+= ksz8863_smi.o

drivers/net/dsa/microchip/ksz_common.c

+34 −0
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@@ -23,6 +23,7 @@ 
#include "ksz_common.h"

#include "ksz8.h"

#include "ksz9477.h"

#include "lan937x.h"



#define MIB_COUNTER_NUM 0x20
@@ -201,6 +202,34 @@ static const struct ksz_dev_ops ksz9477_dev_ops = { 
	.exit = ksz9477_switch_exit,

};



static const struct ksz_dev_ops lan937x_dev_ops = {

	.setup = lan937x_setup,

	.get_port_addr = ksz9477_get_port_addr,

	.cfg_port_member = ksz9477_cfg_port_member,

	.port_setup = lan937x_port_setup,

	.r_mib_cnt = ksz9477_r_mib_cnt,

	.r_mib_pkt = ksz9477_r_mib_pkt,

	.r_mib_stat64 = ksz_r_mib_stats64,

	.freeze_mib = ksz9477_freeze_mib,

	.port_init_cnt = ksz9477_port_init_cnt,

	.vlan_filtering = ksz9477_port_vlan_filtering,

	.vlan_add = ksz9477_port_vlan_add,

	.vlan_del = ksz9477_port_vlan_del,

	.mirror_add = ksz9477_port_mirror_add,

	.mirror_del = ksz9477_port_mirror_del,

	.fdb_dump = ksz9477_fdb_dump,

	.fdb_add = ksz9477_fdb_add,

	.fdb_del = ksz9477_fdb_del,

	.mdb_add = ksz9477_mdb_add,

	.mdb_del = ksz9477_mdb_del,

	.max_mtu = ksz9477_max_mtu,

	.config_cpu_port = lan937x_config_cpu_port,

	.enable_stp_addr = ksz9477_enable_stp_addr,

	.reset = lan937x_reset_switch,

	.init = lan937x_switch_init,

	.exit = lan937x_switch_exit,

};



static const u16 ksz8795_regs[] = {

	[REG_IND_CTRL_0]		= 0x6E,

	[REG_IND_DATA_8]		= 0x70,
@@ -542,6 +571,7 @@ const struct ksz_chip_data ksz_switch_chips[] = { 
		.num_statics = 256,

		.cpu_ports = 0x10,	/* can be configured as cpu port */

		.port_cnt = 5,		/* total physical port count */

		.ops = &lan937x_dev_ops,

		.mib_names = ksz9477_mib_names,

		.mib_cnt = ARRAY_SIZE(ksz9477_mib_names),

		.reg_mib_cnt = MIB_COUNTER_NUM,
@@ -562,6 +592,7 @@ const struct ksz_chip_data ksz_switch_chips[] = { 
		.num_statics = 256,

		.cpu_ports = 0x30,	/* can be configured as cpu port */

		.port_cnt = 6,		/* total physical port count */

		.ops = &lan937x_dev_ops,

		.mib_names = ksz9477_mib_names,

		.mib_cnt = ARRAY_SIZE(ksz9477_mib_names),

		.reg_mib_cnt = MIB_COUNTER_NUM,
@@ -582,6 +613,7 @@ const struct ksz_chip_data ksz_switch_chips[] = { 
		.num_statics = 256,

		.cpu_ports = 0x30,	/* can be configured as cpu port */

		.port_cnt = 8,		/* total physical port count */

		.ops = &lan937x_dev_ops,

		.mib_names = ksz9477_mib_names,

		.mib_cnt = ARRAY_SIZE(ksz9477_mib_names),

		.reg_mib_cnt = MIB_COUNTER_NUM,
@@ -606,6 +638,7 @@ const struct ksz_chip_data ksz_switch_chips[] = { 
		.num_statics = 256,

		.cpu_ports = 0x38,	/* can be configured as cpu port */

		.port_cnt = 5,		/* total physical port count */

		.ops = &lan937x_dev_ops,

		.mib_names = ksz9477_mib_names,

		.mib_cnt = ARRAY_SIZE(ksz9477_mib_names),

		.reg_mib_cnt = MIB_COUNTER_NUM,
@@ -630,6 +663,7 @@ const struct ksz_chip_data ksz_switch_chips[] = { 
		.num_statics = 256,

		.cpu_ports = 0x30,	/* can be configured as cpu port */

		.port_cnt = 8,		/* total physical port count */

		.ops = &lan937x_dev_ops,

		.mib_names = ksz9477_mib_names,

		.mib_cnt = ARRAY_SIZE(ksz9477_mib_names),

		.reg_mib_cnt = MIB_COUNTER_NUM,

drivers/net/dsa/microchip/lan937x.h

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/* SPDX-License-Identifier: GPL-2.0 */

/* Microchip lan937x dev ops headers

 * Copyright (C) 2019-2022 Microchip Technology Inc.

 */



#ifndef __LAN937X_CFG_H

#define __LAN937X_CFG_H



int lan937x_reset_switch(struct ksz_device *dev);

int lan937x_setup(struct dsa_switch *ds);

void lan937x_port_setup(struct ksz_device *dev, int port, bool cpu_port);

void lan937x_config_cpu_port(struct dsa_switch *ds);

int lan937x_switch_init(struct ksz_device *dev);

void lan937x_switch_exit(struct ksz_device *dev);

#endif

drivers/net/dsa/microchip/lan937x_main.c

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// SPDX-License-Identifier: GPL-2.0

/* Microchip LAN937X switch driver main logic

 * Copyright (C) 2019-2022 Microchip Technology Inc.

 */

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/iopoll.h>

#include <linux/phy.h>

#include <linux/of_net.h>

#include <linux/if_bridge.h>

#include <linux/math.h>

#include <net/dsa.h>

#include <net/switchdev.h>



#include "lan937x_reg.h"

#include "ksz_common.h"

#include "lan937x.h"



static int lan937x_cfg(struct ksz_device *dev, u32 addr, u8 bits, bool set)

{

	return regmap_update_bits(dev->regmap[0], addr, bits, set ? bits : 0);

}



static int lan937x_port_cfg(struct ksz_device *dev, int port, int offset,

			    u8 bits, bool set)

{

	return regmap_update_bits(dev->regmap[0], PORT_CTRL_ADDR(port, offset),

				  bits, set ? bits : 0);

}



int lan937x_reset_switch(struct ksz_device *dev)

{

	u32 data32;

	int ret;



	/* reset switch */

	ret = lan937x_cfg(dev, REG_SW_OPERATION, SW_RESET, true);

	if (ret < 0)

		return ret;



	/* Enable Auto Aging */

	ret = lan937x_cfg(dev, REG_SW_LUE_CTRL_1, SW_LINK_AUTO_AGING, true);

	if (ret < 0)

		return ret;



	/* disable interrupts */

	ret = ksz_write32(dev, REG_SW_INT_MASK__4, SWITCH_INT_MASK);

	if (ret < 0)

		return ret;



	ret = ksz_write32(dev, REG_SW_PORT_INT_MASK__4, 0xFF);

	if (ret < 0)

		return ret;



	return ksz_read32(dev, REG_SW_PORT_INT_STATUS__4, &data32);

}



void lan937x_port_setup(struct ksz_device *dev, int port, bool cpu_port)

{

	struct dsa_switch *ds = dev->ds;

	u8 member;



	/* enable tag tail for host port */

	if (cpu_port)

		lan937x_port_cfg(dev, port, REG_PORT_CTRL_0,

				 PORT_TAIL_TAG_ENABLE, true);



	/* disable frame check length field */

	lan937x_port_cfg(dev, port, REG_PORT_MAC_CTRL_0, PORT_CHECK_LENGTH,

			 false);



	/* set back pressure for half duplex */

	lan937x_port_cfg(dev, port, REG_PORT_MAC_CTRL_1, PORT_BACK_PRESSURE,

			 true);



	/* enable 802.1p priority */

	lan937x_port_cfg(dev, port, P_PRIO_CTRL, PORT_802_1P_PRIO_ENABLE, true);



	if (!dev->info->internal_phy[port])

		lan937x_port_cfg(dev, port, REG_PORT_XMII_CTRL_0,

				 PORT_MII_TX_FLOW_CTRL | PORT_MII_RX_FLOW_CTRL,

				 true);



	if (cpu_port)

		member = dsa_user_ports(ds);

	else

		member = BIT(dsa_upstream_port(ds, port));



	dev->dev_ops->cfg_port_member(dev, port, member);

}



void lan937x_config_cpu_port(struct dsa_switch *ds)

{

	struct ksz_device *dev = ds->priv;

	struct dsa_port *dp;



	dsa_switch_for_each_cpu_port(dp, ds) {

		if (dev->info->cpu_ports & (1 << dp->index)) {

			dev->cpu_port = dp->index;



			/* enable cpu port */

			lan937x_port_setup(dev, dp->index, true);

		}

	}



	dsa_switch_for_each_user_port(dp, ds) {

		ksz_port_stp_state_set(ds, dp->index, BR_STATE_DISABLED);

	}

}



int lan937x_setup(struct dsa_switch *ds)

{

	struct ksz_device *dev = ds->priv;



	/* The VLAN aware is a global setting. Mixed vlan

	 * filterings are not supported.

	 */

	ds->vlan_filtering_is_global = true;



	/* Enable aggressive back off for half duplex & UNH mode */

	lan937x_cfg(dev, REG_SW_MAC_CTRL_0,

		    (SW_PAUSE_UNH_MODE | SW_NEW_BACKOFF | SW_AGGR_BACKOFF),

		    true);



	/* If NO_EXC_COLLISION_DROP bit is set, the switch will not drop

	 * packets when 16 or more collisions occur

	 */

	lan937x_cfg(dev, REG_SW_MAC_CTRL_1, NO_EXC_COLLISION_DROP, true);



	/* enable global MIB counter freeze function */

	lan937x_cfg(dev, REG_SW_MAC_CTRL_6, SW_MIB_COUNTER_FREEZE, true);



	/* disable CLK125 & CLK25, 1: disable, 0: enable */

	lan937x_cfg(dev, REG_SW_GLOBAL_OUTPUT_CTRL__1,

		    (SW_CLK125_ENB | SW_CLK25_ENB), true);



	return 0;

}



int lan937x_switch_init(struct ksz_device *dev)

{

	dev->port_mask = (1 << dev->info->port_cnt) - 1;



	return 0;

}



void lan937x_switch_exit(struct ksz_device *dev)

{

	lan937x_reset_switch(dev);

}



MODULE_AUTHOR("Arun Ramadoss <arun.ramadoss@microchip.com>");

MODULE_DESCRIPTION("Microchip LAN937x Series Switch DSA Driver");

MODULE_LICENSE("GPL");