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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright 2019-2021 NXP
*/
#ifndef __DSA_H__
#define __DSA_H__
#include <linux/phy.h>
#include <net.h>
/**
* DSA stands for Distributed Switch Architecture and it is infrastructure
* intended to support drivers for Switches that rely on an intermediary
* Ethernet device for I/O. These switches may support cascading allowing
* them to be arranged as a tree.
* DSA is documented in detail in the Linux kernel documentation under
* Documentation/networking/dsa/dsa.txt
* The network layout of such a switch is shown below:
*
* |------|
* | eth0 | <--- master eth device (regular eth driver)
* |------|
* ^ |
* tag added by switch -->| |
* | |
* | |<-- tag added by DSA driver
* | v
* |--------------------------------------|
* | | CPU port | | <-- DSA (switch) device
* | ------------ | (DSA driver)
* | _________ _________ _________ |
* | | port0 | | port1 | ... | portn | | <-- ports as eth devices
* |-+-------+--+-------+-------+-------+-| ('dsa-port' eth driver)
*
*/
#define DSA_MAX_PORTS 12
#define DSA_PKTSIZE 1538
struct dsa_port;
struct dsa_switch;
struct dsa_ops {
int (*port_probe)(struct dsa_port *dp, int port,
phy_interface_t phy_mode);
int (*port_pre_enable)(struct dsa_port *dp, int port,
phy_interface_t phy_mode);
int (*port_enable)(struct dsa_port *dp, int port,
struct phy_device *phy);
void (*port_disable)(struct dsa_port *dp, int port,
struct phy_device *phy);
int (*xmit)(struct dsa_port *dp, int port, void *packet, int length);
int (*rcv)(struct dsa_switch *ds, int *portp, void *packet, int length);
int (*phy_read)(struct dsa_switch *ds, int port, int regnum);
int (*phy_write)(struct dsa_switch *ds, int port, int regnum, u16 val);
};
struct dsa_port {
struct device_d dev;
struct dsa_switch *ds;
unsigned int index;
struct eth_device edev;
unsigned char *rx_buf;
size_t rx_buf_length;
bool enabled;
};
struct dsa_switch {
struct device_d *dev;
const struct dsa_ops *ops;
size_t num_ports;
u32 cpu_port;
int cpu_port_users;
struct eth_device *edev_master;
struct phy_device *cpu_port_fixed_phy;
struct dsa_port *dp[DSA_MAX_PORTS];
size_t needed_headroom;
size_t needed_rx_tailroom;
size_t needed_tx_tailroom;
void *tx_buf;
struct mii_bus *slave_mii_bus;
u32 phys_mii_mask;
};
int dsa_register_switch(struct dsa_switch *ds);
u32 dsa_user_ports(struct dsa_switch *ds);
#endif /* __DSA_H__ */
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