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/* SPDX-License-Identifier: GPL-2.0 */
/*
 *	LiMon Monitor (LiMon) - Network.
 *
 *	Copyright 1994 - 2000 Neil Russell.
 *	(See License)
 *
 * History
 *	9/16/00	  bor  adapted to TQM823L/STK8xxL board, RARP/TFTP boot added
 */

#ifndef __NET_H__
#define __NET_H__

#include <linux/types.h>
#include <asm/cache.h>
#include <asm/byteorder.h>	/* for nton* / ntoh* stuff */
#include <env.h>
#include <log.h>
#include <time.h>
#include <linux/if_ether.h>
#include <rand.h>

struct bd_info;
struct cmd_tbl;
struct udevice;

#define DEBUG_LL_STATE 0	/* Link local state machine changes */
#define DEBUG_DEV_PKT 0		/* Packets or info directed to the device */
#define DEBUG_NET_PKT 0		/* Packets on info on the network at large */
#define DEBUG_INT_STATE 0	/* Internal network state changes */

/*
 *	The number of receive packet buffers, and the required packet buffer
 *	alignment in memory.
 *
 */

#ifdef CONFIG_SYS_RX_ETH_BUFFER
# define PKTBUFSRX	CONFIG_SYS_RX_ETH_BUFFER
#else
# define PKTBUFSRX	4
#endif

#define PKTALIGN	ARCH_DMA_MINALIGN

/* Number of packets processed together */
#define ETH_PACKETS_BATCH_RECV	32

/* ARP hardware address length */
#define ARP_HLEN 6
/*
 * The size of a MAC address in string form, each digit requires two chars
 * and five separator characters to form '00:00:00:00:00:00'.
 */
#define ARP_HLEN_ASCII (ARP_HLEN * 2) + (ARP_HLEN - 1)

/* IPv4 addresses are always 32 bits in size */
struct in_addr {
	__be32 s_addr;
};

/**
 * do_tftpb - Run the tftpboot command
 *
 * @cmdtp: Command information for tftpboot
 * @flag: Command flags (CMD_FLAG_...)
 * @argc: Number of arguments
 * @argv: List of arguments
 * @return result (see enum command_ret_t)
 */
int do_tftpb(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[]);

/**
 * An incoming packet handler.
 * @param pkt    pointer to the application packet
 * @param dport  destination UDP port
 * @param sip    source IP address
 * @param sport  source UDP port
 * @param len    packet length
 */
typedef void rxhand_f(uchar *pkt, unsigned dport,
		      struct in_addr sip, unsigned sport,
		      unsigned len);

/**
 * An incoming ICMP packet handler.
 * @param type	ICMP type
 * @param code	ICMP code
 * @param dport	destination UDP port
 * @param sip	source IP address
 * @param sport	source UDP port
 * @param pkt	pointer to the ICMP packet data
 * @param len	packet length
 */
typedef void rxhand_icmp_f(unsigned type, unsigned code, unsigned dport,
		struct in_addr sip, unsigned sport, uchar *pkt, unsigned len);

/*
 *	A timeout handler.  Called after time interval has expired.
 */
typedef void	thand_f(void);

enum eth_state_t {
	ETH_STATE_INIT,
	ETH_STATE_PASSIVE,
	ETH_STATE_ACTIVE
};

#ifdef CONFIG_DM_ETH
/**
 * struct eth_pdata - Platform data for Ethernet MAC controllers
 *
 * @iobase: The base address of the hardware registers
 * @enetaddr: The Ethernet MAC address that is loaded from EEPROM or env
 * @phy_interface: PHY interface to use - see PHY_INTERFACE_MODE_...
 * @max_speed: Maximum speed of Ethernet connection supported by MAC
 * @priv_pdata: device specific plat
 */
struct eth_pdata {
	phys_addr_t iobase;
	unsigned char enetaddr[ARP_HLEN];
	int phy_interface;
	int max_speed;
	void *priv_pdata;
};

enum eth_recv_flags {
	/*
	 * Check hardware device for new packets (otherwise only return those
	 * which are already in the memory buffer ready to process)
	 */
	ETH_RECV_CHECK_DEVICE		= 1 << 0,
};

/**
 * struct eth_ops - functions of Ethernet MAC controllers
 *
 * start: Prepare the hardware to send and receive packets
 * send: Send the bytes passed in "packet" as a packet on the wire
 * recv: Check if the hardware received a packet. If so, set the pointer to the
 *	 packet buffer in the packetp parameter. If not, return an error or 0 to
 *	 indicate that the hardware receive FIFO is empty. If 0 is returned, the
 *	 network stack will not process the empty packet, but free_pkt() will be
 *	 called if supplied
 * free_pkt: Give the driver an opportunity to manage its packet buffer memory
 *	     when the network stack is finished processing it. This will only be
 *	     called when no error was returned from recv - optional
 * stop: Stop the hardware from looking for packets - may be called even if
 *	 state == PASSIVE
 * mcast: Join or leave a multicast group (for TFTP) - optional
 * write_hwaddr: Write a MAC address to the hardware (used to pass it to Linux
 *		 on some platforms like ARM). This function expects the
 *		 eth_pdata::enetaddr field to be populated. The method can
 *		 return -ENOSYS to indicate that this is not implemented for
		 this hardware - optional.
 * read_rom_hwaddr: Some devices have a backup of the MAC address stored in a
 *		    ROM on the board. This is how the driver should expose it
 *		    to the network stack. This function should fill in the
 *		    eth_pdata::enetaddr field - optional
 */
struct eth_ops {
	int (*start)(struct udevice *dev);
	int (*send)(struct udevice *dev, void *packet, int length);
	int (*recv)(struct udevice *dev, int flags, uchar **packetp);
	int (*free_pkt)(struct udevice *dev, uchar *packet, int length);
	void (*stop)(struct udevice *dev);
	int (*mcast)(struct udevice *dev, const u8 *enetaddr, int join);
	int (*write_hwaddr)(struct udevice *dev);
	int (*read_rom_hwaddr)(struct udevice *dev);
};

#define eth_get_ops(dev) ((struct eth_ops *)(dev)->driver->ops)

struct udevice *eth_get_dev(void); /* get the current device */
/*
 * The devname can be either an exact name given by the driver or device tree
 * or it can be an alias of the form "eth%d"
 */
struct udevice *eth_get_dev_by_name(const char *devname);
unsigned char *eth_get_ethaddr(void); /* get the current device MAC */

/* Used only when NetConsole is enabled */
int eth_is_active(struct udevice *dev); /* Test device for active state */
int eth_init_state_only(void); /* Set active state */
void eth_halt_state_only(void); /* Set passive state */
#endif

#ifndef CONFIG_DM_ETH
struct eth_device {
#define ETH_NAME_LEN 20
	char name[ETH_NAME_LEN];
	unsigned char enetaddr[ARP_HLEN];
	phys_addr_t iobase;
	int state;

	int (*init)(struct eth_device *eth, struct bd_info *bd);
	int (*send)(struct eth_device *, void *packet, int length);
	int (*recv)(struct eth_device *);
	void (*halt)(struct eth_device *);
	int (*mcast)(struct eth_device *, const u8 *enetaddr, int join);
	int (*write_hwaddr)(struct eth_device *eth);
	struct eth_device *next;
	int index;
	void *priv;
};

int eth_register(struct eth_device *dev);/* Register network device */
int eth_unregister(struct eth_device *dev);/* Remove network device */

extern struct eth_device *eth_current;

static __always_inline struct eth_device *eth_get_dev(void)
{
	return eth_current;
}
struct eth_device *eth_get_dev_by_name(const char *devname);
struct eth_device *eth_get_dev_by_index(int index); /* get dev @ index */

/* get the current device MAC */
static inline unsigned char *eth_get_ethaddr(void)
{
	if (eth_current)
		return eth_current->enetaddr;
	return NULL;
}

/* Used only when NetConsole is enabled */
int eth_is_active(struct eth_device *dev); /* Test device for active state */
/* Set active state */
static __always_inline int eth_init_state_only(void)
{
	eth_get_dev()->state = ETH_STATE_ACTIVE;

	return 0;
}
/* Set passive state */
static __always_inline void eth_halt_state_only(void)
{
	eth_get_dev()->state = ETH_STATE_PASSIVE;
}

/*
 * Set the hardware address for an ethernet interface based on 'eth%daddr'
 * environment variable (or just 'ethaddr' if eth_number is 0).
 * Args:
 *	base_name - base name for device (normally "eth")
 *	eth_number - value of %d (0 for first device of this type)
 * Returns:
 *	0 is success, non-zero is error status from driver.
 */
int eth_write_hwaddr(struct eth_device *dev, const char *base_name,
		     int eth_number);

int usb_eth_initialize(struct bd_info *bi);
#endif

int eth_initialize(void);		/* Initialize network subsystem */
void eth_try_another(int first_restart);	/* Change the device */
void eth_set_current(void);		/* set nterface to ethcur var */

int eth_get_dev_index(void);		/* get the device index */

/**
 * eth_env_set_enetaddr_by_index() - set the MAC address environment variable
 *
 * This sets up an environment variable with the given MAC address (@enetaddr).
 * The environment variable to be set is defined by <@base_name><@index>addr.
 * If @index is 0 it is omitted. For common Ethernet this means ethaddr,
 * eth1addr, etc.
 *
 * @base_name:  Base name for variable, typically "eth"
 * @index:      Index of interface being updated (>=0)
 * @enetaddr:   Pointer to MAC address to put into the variable
 * @return 0 if OK, other value on error
 */
int eth_env_set_enetaddr_by_index(const char *base_name, int index,
				 uchar *enetaddr);


/*
 * Initialize USB ethernet device with CONFIG_DM_ETH
 * Returns:
 *	0 is success, non-zero is error status.
 */
int usb_ether_init(void);

/*
 * Get the hardware address for an ethernet interface .
 * Args:
 *	base_name - base name for device (normally "eth")
 *	index - device index number (0 for first)
 *	enetaddr - returns 6 byte hardware address
 * Returns:
 *	Return true if the address is valid.
 */
int eth_env_get_enetaddr_by_index(const char *base_name, int index,
				 uchar *enetaddr);

int eth_init(void);			/* Initialize the device */
int eth_send(void *packet, int length);	   /* Send a packet */

#if defined(CONFIG_API) || defined(CONFIG_EFI_LOADER)
int eth_receive(void *packet, int length); /* Receive a packet*/
extern void (*push_packet)(void *packet, int length);
#endif
int eth_rx(void);			/* Check for received packets */
void eth_halt(void);			/* stop SCC */
const char *eth_get_name(void);		/* get name of current device */
int eth_mcast_join(struct in_addr mcast_addr, int join);

/**********************************************************************/
/*
 *	Protocol headers.
 */

/*
 *	Ethernet header
 */

struct ethernet_hdr {
	u8		et_dest[ARP_HLEN];	/* Destination node	*/
	u8		et_src[ARP_HLEN];	/* Source node		*/
	u16		et_protlen;		/* Protocol or length	*/
} __attribute__((packed));

/* Ethernet header size */
#define ETHER_HDR_SIZE	(sizeof(struct ethernet_hdr))

#define ETH_FCS_LEN	4		/* Octets in the FCS		*/

struct e802_hdr {
	u8		et_dest[ARP_HLEN];	/* Destination node	*/
	u8		et_src[ARP_HLEN];	/* Source node		*/
	u16		et_protlen;		/* Protocol or length	*/


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