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

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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: Arun Ramadoss <arun.ramadoss@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arun Ramadoss 2022-07-01 20:31:46 +05:30 • committed by David S. Miller
parent 457c182af5
commit 55ab6ffaf3
6 changed files with 333 additions and 1 deletions
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2
drivers/net/dsa/microchip/Kconfig
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@ -1,6 +1,6 @@
# 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

1
drivers/net/dsa/microchip/Makefile
View file

@ -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

34
drivers/net/dsa/microchip/ksz_common.c
View file

@ -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,

15
drivers/net/dsa/microchip/lan937x.h Normal file
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@ -0,0 +1,15 @@
/* 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

154
drivers/net/dsa/microchip/lan937x_main.c Normal file
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@ -0,0 +1,154 @@
// 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");

128
drivers/net/dsa/microchip/lan937x_reg.h Normal file
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@ -0,0 +1,128 @@
/* SPDX-License-Identifier: GPL-2.0 */
/* Microchip LAN937X switch register definitions
* Copyright (C) 2019-2021 Microchip Technology Inc.
*/
#ifndef __LAN937X_REG_H
#define __LAN937X_REG_H
#define PORT_CTRL_ADDR(port, addr) ((addr) | (((port) + 1) << 12))
/* 0 - Operation */
#define REG_SW_INT_STATUS__4 0x0010
#define REG_SW_INT_MASK__4 0x0014
#define LUE_INT BIT(31)
#define TRIG_TS_INT BIT(30)
#define APB_TIMEOUT_INT BIT(29)
#define OVER_TEMP_INT BIT(28)
#define HSR_INT BIT(27)
#define PIO_INT BIT(26)
#define POR_READY_INT BIT(25)
#define SWITCH_INT_MASK \
(LUE_INT | TRIG_TS_INT | APB_TIMEOUT_INT | OVER_TEMP_INT | HSR_INT | \
PIO_INT | POR_READY_INT)
#define REG_SW_PORT_INT_STATUS__4 0x0018
#define REG_SW_PORT_INT_MASK__4 0x001C
/* 1 - Global */
#define REG_SW_GLOBAL_OUTPUT_CTRL__1 0x0103
#define SW_CLK125_ENB BIT(1)
#define SW_CLK25_ENB BIT(0)
/* 3 - Operation Control */
#define REG_SW_OPERATION 0x0300
#define SW_DOUBLE_TAG BIT(7)
#define SW_OVER_TEMP_ENABLE BIT(2)
#define SW_RESET BIT(1)
#define REG_SW_LUE_CTRL_0 0x0310
#define SW_VLAN_ENABLE BIT(7)
#define SW_DROP_INVALID_VID BIT(6)
#define SW_AGE_CNT_M 0x7
#define SW_AGE_CNT_S 3
#define SW_RESV_MCAST_ENABLE BIT(2)
#define REG_SW_LUE_CTRL_1 0x0311
#define UNICAST_LEARN_DISABLE BIT(7)
#define SW_FLUSH_STP_TABLE BIT(5)
#define SW_FLUSH_MSTP_TABLE BIT(4)
#define SW_SRC_ADDR_FILTER BIT(3)
#define SW_AGING_ENABLE BIT(2)
#define SW_FAST_AGING BIT(1)
#define SW_LINK_AUTO_AGING BIT(0)
#define REG_SW_MAC_CTRL_0 0x0330
#define SW_NEW_BACKOFF BIT(7)
#define SW_PAUSE_UNH_MODE BIT(1)
#define SW_AGGR_BACKOFF BIT(0)
#define REG_SW_MAC_CTRL_1 0x0331
#define SW_SHORT_IFG BIT(7)
#define MULTICAST_STORM_DISABLE BIT(6)
#define SW_BACK_PRESSURE BIT(5)
#define FAIR_FLOW_CTRL BIT(4)
#define NO_EXC_COLLISION_DROP BIT(3)
#define SW_LEGAL_PACKET_DISABLE BIT(1)
#define SW_PASS_SHORT_FRAME BIT(0)
#define REG_SW_MAC_CTRL_6 0x0336
#define SW_MIB_COUNTER_FLUSH BIT(7)
#define SW_MIB_COUNTER_FREEZE BIT(6)
/* 4 - LUE */
#define REG_SW_ALU_STAT_CTRL__4 0x041C
#define REG_SW_ALU_VAL_B 0x0424
#define ALU_V_OVERRIDE BIT(31)
#define ALU_V_USE_FID BIT(30)
#define ALU_V_PORT_MAP 0xFF
/* Port Registers */
/* 0 - Operation */
#define REG_PORT_CTRL_0 0x0020
#define PORT_MAC_LOOPBACK BIT(7)
#define PORT_MAC_REMOTE_LOOPBACK BIT(6)
#define PORT_K2L_INSERT_ENABLE BIT(5)
#define PORT_K2L_DEBUG_ENABLE BIT(4)
#define PORT_TAIL_TAG_ENABLE BIT(2)
#define PORT_QUEUE_SPLIT_ENABLE 0x3
/* 3 - xMII */
#define REG_PORT_XMII_CTRL_0 0x0300
#define PORT_SGMII_SEL BIT(7)
#define PORT_MII_FULL_DUPLEX BIT(6)
#define PORT_MII_TX_FLOW_CTRL BIT(5)
#define PORT_MII_100MBIT BIT(4)
#define PORT_MII_RX_FLOW_CTRL BIT(3)
#define PORT_GRXC_ENABLE BIT(0)
/* 4 - MAC */
#define REG_PORT_MAC_CTRL_0 0x0400
#define PORT_CHECK_LENGTH BIT(2)
#define PORT_BROADCAST_STORM BIT(1)
#define PORT_JUMBO_PACKET BIT(0)
#define REG_PORT_MAC_CTRL_1 0x0401
#define PORT_BACK_PRESSURE BIT(3)
#define PORT_PASS_ALL BIT(0)
/* 8 - Classification and Policing */
#define REG_PORT_MRI_PRIO_CTRL 0x0801
#define PORT_HIGHEST_PRIO BIT(7)
#define PORT_OR_PRIO BIT(6)
#define PORT_MAC_PRIO_ENABLE BIT(4)
#define PORT_VLAN_PRIO_ENABLE BIT(3)
#define PORT_802_1P_PRIO_ENABLE BIT(2)
#define PORT_DIFFSERV_PRIO_ENABLE BIT(1)
#define PORT_ACL_PRIO_ENABLE BIT(0)
#define P_PRIO_CTRL REG_PORT_MRI_PRIO_CTRL
#endif