/*

   * (C) Copyright 2001-2015

   * Wolfgang Denk, DENX Software Engineering, wd@denx.de.

   * Joe Hershberger, National Instruments

   *

   * SPDX-License-Identifier:	GPL-2.0+

   */
  
  #include <common.h>
  #include <command.h>

  #include <environment.h>

  #include <net.h>

  #include <phy.h>

  #include <linux/errno.h>

  #include "eth_internal.h"

  DECLARE_GLOBAL_DATA_PTR;

  /*
   * CPU and board-specific Ethernet initializations.  Aliased function
   * signals caller to move on
   */
  static int __def_eth_init(bd_t *bis)
  {
  	return -1;
  }
  int cpu_eth_init(bd_t *bis) __attribute__((weak, alias("__def_eth_init")));
  int board_eth_init(bd_t *bis) __attribute__((weak, alias("__def_eth_init")));

  #ifdef CONFIG_API

  static struct {
  	uchar data[PKTSIZE];
  	int length;
  } eth_rcv_bufs[PKTBUFSRX];

  static unsigned int eth_rcv_current, eth_rcv_last;

  #endif

  static struct eth_device *eth_devices;
  struct eth_device *eth_current;

  void eth_set_current_to_next(void)

  {
  	eth_current = eth_current->next;
  }

  void eth_set_dev(struct eth_device *dev)

  {
  	eth_current = dev;
  }

  struct eth_device *eth_get_dev_by_name(const char *devname)

  {
  	struct eth_device *dev, *target_dev;

  	BUG_ON(devname == NULL);

  	if (!eth_devices)
  		return NULL;
  
  	dev = eth_devices;
  	target_dev = NULL;
  	do {
  		if (strcmp(devname, dev->name) == 0) {
  			target_dev = dev;
  			break;
  		}
  		dev = dev->next;
  	} while (dev != eth_devices);
  
  	return target_dev;
  }

  struct eth_device *eth_get_dev_by_index(int index)
  {
  	struct eth_device *dev, *target_dev;

  
  	if (!eth_devices)
  		return NULL;
  
  	dev = eth_devices;
  	target_dev = NULL;
  	do {

  		if (dev->index == index) {

  			target_dev = dev;
  			break;
  		}
  		dev = dev->next;

  	} while (dev != eth_devices);
  
  	return target_dev;
  }

  int eth_get_dev_index(void)

  {

  	if (!eth_current)

  		return -1;

  	return eth_current->index;

  }

  static int on_ethaddr(const char *name, const char *value, enum env_op op,
  	int flags)
  {
  	int index;
  	struct eth_device *dev;
  
  	if (!eth_devices)
  		return 0;
  
  	/* look for an index after "eth" */
  	index = simple_strtoul(name + 3, NULL, 10);
  
  	dev = eth_devices;
  	do {
  		if (dev->index == index) {
  			switch (op) {
  			case env_op_create:
  			case env_op_overwrite:
  				eth_parse_enetaddr(value, dev->enetaddr);

  				eth_write_hwaddr(dev, "eth", dev->index);

  				break;
  			case env_op_delete:

  				memset(dev->enetaddr, 0, ARP_HLEN);

  			}
  		}

  		dev = dev->next;

  	} while (dev != eth_devices);
  
  	return 0;
  }
  U_BOOT_ENV_CALLBACK(ethaddr, on_ethaddr);

  int eth_write_hwaddr(struct eth_device *dev, const char *base_name,
  		   int eth_number)
  {

  	unsigned char env_enetaddr[ARP_HLEN];

  	int ret = 0;

  	eth_env_get_enetaddr_by_index(base_name, eth_number, env_enetaddr);

  	if (!is_zero_ethaddr(env_enetaddr)) {
  		if (!is_zero_ethaddr(dev->enetaddr) &&

  		    memcmp(dev->enetaddr, env_enetaddr, ARP_HLEN)) {

  			printf("
  Warning: %s MAC addresses don't match:
  ",

  			       dev->name);

  			printf("Address in SROM is         %pM
  ",

  			       dev->enetaddr);

  			printf("Address in environment is  %pM
  ",

  			       env_enetaddr);

  		}

  		memcpy(dev->enetaddr, env_enetaddr, ARP_HLEN);

  	} else if (is_valid_ethaddr(dev->enetaddr)) {

  		eth_env_set_enetaddr_by_index(base_name, eth_number,
  					      dev->enetaddr);

  	} else if (is_zero_ethaddr(dev->enetaddr)) {

  #ifdef CONFIG_NET_RANDOM_ETHADDR
  		net_random_ethaddr(dev->enetaddr);
  		printf("
  Warning: %s (eth%d) using random MAC address - %pM
  ",
  		       dev->name, eth_number, dev->enetaddr);
  #else

  		printf("
  Error: %s address not set.
  ",
  		       dev->name);
  		return -EINVAL;

  #endif

  	}

  	if (dev->write_hwaddr && !eth_mac_skip(eth_number)) {

  		if (!is_valid_ethaddr(dev->enetaddr)) {

  			printf("
  Error: %s address %pM illegal value
  ",

  			       dev->name, dev->enetaddr);

  			return -EINVAL;
  		}

  		ret = dev->write_hwaddr(dev);

  		if (ret)

  			printf("
  Warning: %s failed to set MAC address
  ",
  			       dev->name);

  	}

  
  	return ret;
  }

  int eth_register(struct eth_device *dev)
  {
  	struct eth_device *d;

  	static int index;

  	assert(strlen(dev->name) < sizeof(dev->name));

  	if (!eth_devices) {

  		eth_devices = dev;
  		eth_current = dev;

  		eth_current_changed();

  	} else {

  		for (d = eth_devices; d->next != eth_devices; d = d->next)

  			;

  		d->next = dev;
  	}
  
  	dev->state = ETH_STATE_INIT;
  	dev->next  = eth_devices;

  	dev->index = index++;

  
  	return 0;
  }

  int eth_unregister(struct eth_device *dev)
  {
  	struct eth_device *cur;
  
  	/* No device */
  	if (!eth_devices)

  		return -ENODEV;

  
  	for (cur = eth_devices; cur->next != eth_devices && cur->next != dev;
  	     cur = cur->next)
  		;
  
  	/* Device not found */
  	if (cur->next != dev)

  		return -ENODEV;

  
  	cur->next = dev->next;
  
  	if (eth_devices == dev)
  		eth_devices = dev->next == eth_devices ? NULL : dev->next;
  
  	if (eth_current == dev) {
  		eth_current = eth_devices;
  		eth_current_changed();
  	}
  
  	return 0;
  }

  int eth_initialize(void)

  {

  	int num_devices = 0;

  	eth_devices = NULL;
  	eth_current = NULL;

  	eth_common_init();

  	/*
  	 * If board-specific initialization exists, call it.
  	 * If not, call a CPU-specific one
  	 */
  	if (board_eth_init != __def_eth_init) {
  		if (board_eth_init(gd->bd) < 0)
  			printf("Board Net Initialization Failed
  ");
  	} else if (cpu_eth_init != __def_eth_init) {
  		if (cpu_eth_init(gd->bd) < 0)
  			printf("CPU Net Initialization Failed
  ");
  	} else {
  		printf("Net Initialization Skipped
  ");
  	}

  	if (!eth_devices) {

  		puts("No ethernet found.
  ");

  		bootstage_error(BOOTSTAGE_ID_NET_ETH_START);

  	} else {
  		struct eth_device *dev = eth_devices;

  		char *ethprime = env_get("ethprime");

  		bootstage_mark(BOOTSTAGE_ID_NET_ETH_INIT);

  		do {

  			if (dev->index)

  				puts(", ");

  
  			printf("%s", dev->name);

  			if (ethprime && strcmp(dev->name, ethprime) == 0) {

  				eth_current = dev;

  				puts(" [PRIME]");

  			}

  			if (strchr(dev->name, ' '))

  				puts("
  Warning: eth device name has a space!"
  					"
  ");

  			eth_write_hwaddr(dev, "eth", dev->index);

  			dev = dev->next;

  			num_devices++;

  		} while (dev != eth_devices);

  		eth_current_changed();

  		putc('
  ');

  	}

  	return num_devices;

  }

  #ifdef CONFIG_MCAST_TFTP
  /* Multicast.
   * mcast_addr: multicast ipaddr from which multicast Mac is made

   * join: 1=join, 0=leave.

   */

  int eth_mcast_join(struct in_addr mcast_ip, int join)

  {

  	u8 mcast_mac[ARP_HLEN];

  	if (!eth_current || !eth_current->mcast)

  		return -1;

  	mcast_mac[5] = htonl(mcast_ip.s_addr) & 0xff;
  	mcast_mac[4] = (htonl(mcast_ip.s_addr)>>8) & 0xff;
  	mcast_mac[3] = (htonl(mcast_ip.s_addr)>>16) & 0x7f;

  	mcast_mac[2] = 0x5e;
  	mcast_mac[1] = 0x0;
  	mcast_mac[0] = 0x1;
  	return eth_current->mcast(eth_current, mcast_mac, join);
  }

  /* the 'way' for ethernet-CRC-32. Spliced in from Linux lib/crc32.c
   * and this is the ethernet-crc method needed for TSEC -- and perhaps

   * some other adapter -- hash tables
   */
  #define CRCPOLY_LE 0xedb88320

  u32 ether_crc(size_t len, unsigned char const *p)

  {
  	int i;
  	u32 crc;
  	crc = ~0;
  	while (len--) {
  		crc ^= *p++;
  		for (i = 0; i < 8; i++)
  			crc = (crc >> 1) ^ ((crc & 1) ? CRCPOLY_LE : 0);
  	}
  	/* an reverse the bits, cuz of way they arrive -- last-first */
  	crc = (crc >> 16) | (crc << 16);
  	crc = (crc >> 8 & 0x00ff00ff) | (crc << 8 & 0xff00ff00);
  	crc = (crc >> 4 & 0x0f0f0f0f) | (crc << 4 & 0xf0f0f0f0);
  	crc = (crc >> 2 & 0x33333333) | (crc << 2 & 0xcccccccc);
  	crc = (crc >> 1 & 0x55555555) | (crc << 1 & 0xaaaaaaaa);
  	return crc;
  }
  
  #endif

  int eth_init(void)

  {

  	struct eth_device *old_current;

  	if (!eth_current) {

  		puts("No ethernet found.
  ");

  		return -ENODEV;

  	}

  
  	old_current = eth_current;
  	do {

  		debug("Trying %s
  ", eth_current->name);

  		if (eth_current->init(eth_current, gd->bd) >= 0) {

  			eth_current->state = ETH_STATE_ACTIVE;

  			return 0;

  		}

  		debug("FAIL
  ");

  
  		eth_try_another(0);
  	} while (old_current != eth_current);

  	return -ETIMEDOUT;

  }
  
  void eth_halt(void)
  {
  	if (!eth_current)
  		return;
  
  	eth_current->halt(eth_current);
  
  	eth_current->state = ETH_STATE_PASSIVE;
  }

  int eth_is_active(struct eth_device *dev)
  {
  	return dev && dev->state == ETH_STATE_ACTIVE;
  }

  int eth_send(void *packet, int length)

  {
  	if (!eth_current)

  		return -ENODEV;

  
  	return eth_current->send(eth_current, packet, length);
  }
  
  int eth_rx(void)
  {
  	if (!eth_current)

  		return -ENODEV;

  
  	return eth_current->recv(eth_current);
  }

  #ifdef CONFIG_API

  static void eth_save_packet(void *packet, int length)

  {

  	char *p = packet;

  	int i;
  
  	if ((eth_rcv_last+1) % PKTBUFSRX == eth_rcv_current)
  		return;
  
  	if (PKTSIZE < length)
  		return;
  
  	for (i = 0; i < length; i++)
  		eth_rcv_bufs[eth_rcv_last].data[i] = p[i];
  
  	eth_rcv_bufs[eth_rcv_last].length = length;
  	eth_rcv_last = (eth_rcv_last + 1) % PKTBUFSRX;
  }

  int eth_receive(void *packet, int length)

  {

  	char *p = packet;

  	void *pp = push_packet;
  	int i;
  
  	if (eth_rcv_current == eth_rcv_last) {
  		push_packet = eth_save_packet;
  		eth_rx();
  		push_packet = pp;
  
  		if (eth_rcv_current == eth_rcv_last)
  			return -1;
  	}

  	length = min(eth_rcv_bufs[eth_rcv_current].length, length);

  
  	for (i = 0; i < length; i++)
  		p[i] = eth_rcv_bufs[eth_rcv_current].data[i];
  
  	eth_rcv_current = (eth_rcv_current + 1) % PKTBUFSRX;
  	return length;
  }
  #endif /* CONFIG_API */