[uboot] create uboot from github:
repo: https://github.com/u-boot/u-boot commit: d80bb749fab53da72c4a0e09b8c2d2aaa3103c91 Change-Id: Ie6434426e1ec15bc08bb1832798e371f3fd5fb29
This commit is contained in:
sam.xiang
165
u-boot-2021.10/include/net/dsa.h
Normal file
165
u-boot-2021.10/include/net/dsa.h
Normal file
@ -0,0 +1,165 @@
|
||||
/* SPDX-License-Identifier: GPL-2.0+ */
|
||||
/*
|
||||
* Copyright 2019-2021 NXP Semiconductors
|
||||
*/
|
||||
|
||||
#ifndef __DSA_H__
|
||||
#define __DSA_H__
|
||||
|
||||
#include <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)
|
||||
*
|
||||
* In U-Boot the intent is to allow access to front panel ports (shown at the
|
||||
* bottom of the picture) through the master Ethernet dev (eth0 in the picture).
|
||||
* Front panel ports are presented as regular Ethernet devices in U-Boot and
|
||||
* they are expected to support the typical networking commands.
|
||||
* In general DSA switches require the use of tags, extra headers added both by
|
||||
* software on Tx and by the switch on Rx. These tags carry at a minimum port
|
||||
* information and switch information for cascaded set-ups.
|
||||
* In U-Boot these tags are inserted and parsed by the DSA switch driver, the
|
||||
* class code helps with headroom/tailroom for the extra headers.
|
||||
*
|
||||
* TODO:
|
||||
* - handle switch cascading, for now U-Boot only supports stand-alone switches.
|
||||
* - Add support to probe DSA switches connected to a MDIO bus, this is needed
|
||||
* to convert switch drivers that are now under drivers/net/phy.
|
||||
*/
|
||||
|
||||
#define DSA_PORT_NAME_LENGTH 16
|
||||
|
||||
/* Maximum number of ports each DSA device can have */
|
||||
#define DSA_MAX_PORTS 12
|
||||
|
||||
/**
|
||||
* struct dsa_ops - DSA operations
|
||||
*
|
||||
* @port_enable: Initialize a switch port for I/O.
|
||||
* @port_disable: Disable I/O for a port.
|
||||
* @xmit: Insert the DSA tag for transmission.
|
||||
* DSA drivers receive a copy of the packet with headroom and
|
||||
* tailroom reserved and set to 0. 'packet' points to headroom
|
||||
* and 'length' is updated to include both head and tailroom.
|
||||
* @rcv: Process the DSA tag on reception and return the port index
|
||||
* from the h/w provided tag. Return the index via 'portp'.
|
||||
* 'packet' and 'length' describe the frame as received from
|
||||
* master including any additional headers.
|
||||
*/
|
||||
struct dsa_ops {
|
||||
int (*port_enable)(struct udevice *dev, int port,
|
||||
struct phy_device *phy);
|
||||
void (*port_disable)(struct udevice *dev, int port,
|
||||
struct phy_device *phy);
|
||||
int (*xmit)(struct udevice *dev, int port, void *packet, int length);
|
||||
int (*rcv)(struct udevice *dev, int *portp, void *packet, int length);
|
||||
};
|
||||
|
||||
#define dsa_get_ops(dev) ((struct dsa_ops *)(dev)->driver->ops)
|
||||
|
||||
/**
|
||||
* struct dsa_port_pdata - DSA port platform data
|
||||
*
|
||||
* @phy: PHY device associated with this port.
|
||||
* The uclass code attempts to set this field for all ports except CPU
|
||||
* port, based on DT information. It may be NULL.
|
||||
* @index: Port index in the DSA switch, set by the uclass code.
|
||||
* @name: Name of the port Eth device. If a label property is present in the
|
||||
* port DT node, it is used as name.
|
||||
*/
|
||||
struct dsa_port_pdata {
|
||||
struct phy_device *phy;
|
||||
u32 index;
|
||||
char name[DSA_PORT_NAME_LENGTH];
|
||||
};
|
||||
|
||||
/**
|
||||
* struct dsa_pdata - Per-device platform data for DSA DM
|
||||
*
|
||||
* @num_ports: Number of ports the device has, must be <= DSA_MAX_PORTS.
|
||||
* This number is extracted from the DT 'ports' node of this
|
||||
* DSA device, and it counts the CPU port and all the other
|
||||
* port subnodes including the disabled ones.
|
||||
* @cpu_port: Index of the switch port linked to the master Ethernet.
|
||||
* The uclass code sets this based on DT information.
|
||||
* @master_node: OF node of the host Ethernet controller.
|
||||
* @cpu_port_node: DT node of the switch's CPU port.
|
||||
*/
|
||||
struct dsa_pdata {
|
||||
int num_ports;
|
||||
u32 cpu_port;
|
||||
ofnode master_node;
|
||||
ofnode cpu_port_node;
|
||||
};
|
||||
|
||||
/**
|
||||
* dsa_set_tagging() - Configure the headroom and/or tailroom sizes
|
||||
*
|
||||
* The DSA class code allocates headroom and tailroom on Tx before
|
||||
* calling the DSA driver's xmit function.
|
||||
* All drivers must call this at probe time.
|
||||
*
|
||||
* @dev: DSA device pointer
|
||||
* @headroom: Size, in bytes, of headroom needed for the DSA tag.
|
||||
* @tailroom: Size, in bytes, of tailroom needed for the DSA tag.
|
||||
* Total headroom and tailroom size should not exceed
|
||||
* DSA_MAX_OVR.
|
||||
* @return 0 if OK, -ve on error
|
||||
*/
|
||||
int dsa_set_tagging(struct udevice *dev, ushort headroom, ushort tailroom);
|
||||
|
||||
/* DSA helpers */
|
||||
|
||||
/**
|
||||
* dsa_get_master() - Return a reference to the master Ethernet device
|
||||
*
|
||||
* Can be called at driver probe time or later.
|
||||
*
|
||||
* @dev: DSA device pointer
|
||||
* @return Master Eth 'udevice' pointer if OK, NULL on error
|
||||
*/
|
||||
struct udevice *dsa_get_master(struct udevice *dev);
|
||||
|
||||
/**
|
||||
* dsa_port_get_pdata() - Helper that returns the platdata of an active
|
||||
* (non-CPU) DSA port device.
|
||||
*
|
||||
* Can be called at driver probe time or later.
|
||||
*
|
||||
* @pdev: DSA port device pointer
|
||||
* @return 'dsa_port_pdata' pointer if OK, NULL on error
|
||||
*/
|
||||
static inline struct dsa_port_pdata *
|
||||
dsa_port_get_pdata(struct udevice *pdev)
|
||||
{
|
||||
struct eth_pdata *eth = dev_get_plat(pdev);
|
||||
|
||||
if (!eth)
|
||||
return NULL;
|
||||
|
||||
return eth->priv_pdata;
|
||||
}
|
||||
|
||||
#endif /* __DSA_H__ */
|
||||
Reference in New Issue
Block a user