/*
   * (C) Copyright 2001-2010
   * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   *
   * SPDX-License-Identifier:	GPL-2.0+
   */
  
  #include <common.h>
  #include <command.h>
  #include <net.h>
  #include <miiphy.h>
  #include <phy.h>
  #include <asm/errno.h>
  
  void eth_parse_enetaddr(const char *addr, uchar *enetaddr)
  {
  	char *end;
  	int i;
  
  	for (i = 0; i < 6; ++i) {
  		enetaddr[i] = addr ? simple_strtoul(addr, &end, 16) : 0;
  		if (addr)
  			addr = (*end) ? end + 1 : end;
  	}
  }
  
  int eth_getenv_enetaddr(char *name, uchar *enetaddr)
  {
  	eth_parse_enetaddr(getenv(name), enetaddr);
  	return is_valid_ether_addr(enetaddr);
  }
  
  int eth_setenv_enetaddr(char *name, const uchar *enetaddr)
  {
  	char buf[20];
  
  	sprintf(buf, "%pM", enetaddr);
  
  	return setenv(name, buf);
  }
  
  int eth_getenv_enetaddr_by_index(const char *base_name, int index,
  				 uchar *enetaddr)
  {
  	char enetvar[32];
  	sprintf(enetvar, index ? "%s%daddr" : "%saddr", base_name, index);
  	return eth_getenv_enetaddr(enetvar, enetaddr);
  }
  
  static inline int eth_setenv_enetaddr_by_index(const char *base_name, int index,
  				 uchar *enetaddr)
  {
  	char enetvar[32];
  	sprintf(enetvar, index ? "%s%daddr" : "%saddr", base_name, index);
  	return eth_setenv_enetaddr(enetvar, enetaddr);
  }
  
  
  static int eth_mac_skip(int index)
  {
  	char enetvar[15];
  	char *skip_state;
  	sprintf(enetvar, index ? "eth%dmacskip" : "ethmacskip", index);
  	return ((skip_state = getenv(enetvar)) != NULL);
  }
  
  /*
   * 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;
  
  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 void eth_current_changed(void)
  {
  	char *act = getenv("ethact");
  	/* update current ethernet name */
  	if (eth_current) {
  		if (act == NULL || strcmp(act, eth_current->name) != 0)
  			setenv("ethact", eth_current->name);
  	}
  	/*
  	 * remove the variable completely if there is no active
  	 * interface
  	 */
  	else if (act != NULL)
  		setenv("ethact", NULL);
  }
  
  static int eth_address_set(unsigned char *addr)
  {
  	return memcmp(addr, "\0\0\0\0\0\0", 6);
  }
  
  int eth_write_hwaddr(struct eth_device *dev, const char *base_name,
  		   int eth_number)
  {
  	unsigned char env_enetaddr[6];
  	int ret = 0;
  
  	eth_getenv_enetaddr_by_index(base_name, eth_number, env_enetaddr);
  
  	if (eth_address_set(env_enetaddr)) {
  		if (eth_address_set(dev->enetaddr) &&
  				memcmp(dev->enetaddr, env_enetaddr, 6)) {
  			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, 6);
  	} else if (is_valid_ether_addr(dev->enetaddr)) {
  		eth_setenv_enetaddr_by_index(base_name, eth_number,
  					     dev->enetaddr);
  		printf("
  Warning: %s using MAC address from net device
  ",
  			dev->name);
  	} else if (!(eth_address_set(dev->enetaddr))) {
  		printf("
  Error: %s address not set.
  ",
  		       dev->name);
  		return -EINVAL;
  	}
  
  	if (dev->write_hwaddr && !eth_mac_skip(eth_number)) {
  		if (!is_valid_ether_addr(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_current = eth_devices = 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 -1;
  
  	for (cur = eth_devices; cur->next != eth_devices && cur->next != dev;
  	     cur = cur->next)
  		;
  
  	/* Device not found */
  	if (cur->next != dev)
  		return -1;
  
  	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;
  }
  
  static void eth_env_init(bd_t *bis)
  {
  	const char *s;
  
  	if ((s = getenv("bootfile")) != NULL)
  		copy_filename(BootFile, s, sizeof(BootFile));
  }
  
  int eth_initialize(bd_t *bis)
  {
  	int num_devices = 0;
  	eth_devices = NULL;
  	eth_current = NULL;
  
  	bootstage_mark(BOOTSTAGE_ID_NET_ETH_START);
  #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII) || defined(CONFIG_PHYLIB)
  	miiphy_init();
  #endif
  
  #ifdef CONFIG_PHYLIB
  	phy_init();
  #endif
  
  	eth_env_init(bis);
  
  	/*
  	 * 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(bis) < 0)
  			printf("Board Net Initialization Failed
  ");
  	} else if (cpu_eth_init != __def_eth_init) {
  		if (cpu_eth_init(bis) < 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 = getenv("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(IPaddr_t mcast_ip, u8 join)
  {
  	u8 mcast_mac[6];
  	if (!eth_current || !eth_current->mcast)
  		return -1;
  	mcast_mac[5] = htonl(mcast_ip) & 0xff;
  	mcast_mac[4] = (htonl(mcast_ip)>>8) & 0xff;
  	mcast_mac[3] = (htonl(mcast_ip)>>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(bd_t *bis)
  {
  	struct eth_device *old_current, *dev;
  
  	if (!eth_current) {
  		puts("No ethernet found.
  ");
  		return -1;
  	}
  
  	/* Sync environment with network devices */
  	dev = eth_devices;
  	do {
  		uchar env_enetaddr[6];
  
  		if (eth_getenv_enetaddr_by_index("eth", dev->index,
  						 env_enetaddr))
  			memcpy(dev->enetaddr, env_enetaddr, 6);
  
  		dev = dev->next;
  	} while (dev != eth_devices);
  
  	old_current = eth_current;
  	do {
  		debug("Trying %s
  ", eth_current->name);
  
  		if (eth_current->init(eth_current, bis) >= 0) {
  			eth_current->state = ETH_STATE_ACTIVE;
  
  			return 0;
  		}
  		debug("FAIL
  ");
  
  		eth_try_another(0);
  	} while (old_current != eth_current);
  
  	return -1;
  }
  
  void eth_halt(void)
  {
  	if (!eth_current)
  		return;
  
  	eth_current->halt(eth_current);
  
  	eth_current->state = ETH_STATE_PASSIVE;
  }
  
  int eth_send(void *packet, int length)
  {
  	if (!eth_current)
  		return -1;
  
  	return eth_current->send(eth_current, packet, length);
  }
  
  int eth_rx(void)
  {
  	if (!eth_current)
  		return -1;
  
  	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 */
  
  void eth_try_another(int first_restart)
  {
  	static struct eth_device *first_failed;
  	char *ethrotate;
  
  	/*
  	 * Do not rotate between network interfaces when
  	 * 'ethrotate' variable is set to 'no'.
  	 */
  	ethrotate = getenv("ethrotate");
  	if ((ethrotate != NULL) && (strcmp(ethrotate, "no") == 0))
  		return;
  
  	if (!eth_current)
  		return;
  
  	if (first_restart)
  		first_failed = eth_current;
  
  	eth_current = eth_current->next;
  
  	eth_current_changed();
  
  	if (first_failed == eth_current)
  		NetRestartWrap = 1;
  }
  
  void eth_set_current(void)
  {
  	static char *act;
  	static int  env_changed_id;
  	struct eth_device *old_current;
  	int	env_id;
  
  	if (!eth_current)	/* XXX no current */
  		return;
  
  	env_id = get_env_id();
  	if ((act == NULL) || (env_changed_id != env_id)) {
  		act = getenv("ethact");
  		env_changed_id = env_id;
  	}
  	if (act != NULL) {
  		old_current = eth_current;
  		do {
  			if (strcmp(eth_current->name, act) == 0)
  				return;
  			eth_current = eth_current->next;
  		} while (old_current != eth_current);
  	}
  
  	eth_current_changed();
  }
  
  char *eth_get_name(void)
  {
  	return eth_current ? eth_current->name : "unknown";
  }