board/atheros/common/qca-eth-953x.c

/*
 * Copyright (c) 2013 Qualcomm Atheros, Inc.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <config.h>
#include <common.h>
#include <malloc.h>
#include <net.h>
#include <command.h>
#include <asm/io.h>
#include <asm/addrspace.h>
#include <asm/types.h>

#include <atheros.h>
#include "qca-eth-953x.h"
#include "qca-eth-953x_phy.h"
#define SGMII_LINK_WAR_MAX_TRY 10

#if (CONFIG_COMMANDS & CFG_CMD_MII)
#include <miiphy.h>
#endif
#define ath_gmac_unit2mac(_unit)     ath_gmac_macs[(_unit)]
#define ath_gmac_name2mac(name)	   is_drqfn() ? ath_gmac_unit2mac(1):strcmp(name,"eth0") ? ath_gmac_unit2mac(1) : ath_gmac_unit2mac(0)

int ath_gmac_miiphy_read(char *devname, uint32_t phaddr, uint8_t reg, uint16_t *data);
int ath_gmac_miiphy_write(char *devname, uint32_t phaddr, uint8_t reg, uint16_t data);
extern void ath_sys_frequency(uint32_t *, uint32_t *, uint32_t *);

#ifndef CFG_ATH_GMAC_NMACS
#define CFG_ATH_GMAC_NMACS	1
#endif /* CFG_ATH_GMAC_NMACS */

ath_gmac_mac_t *ath_gmac_macs[CFG_ATH_GMAC_NMACS];



#ifdef  CFG_ATHRS27_PHY
#define is_s27() 1

#else 
#define is_s27() 0

#endif 
#ifdef  CFG_ATHRS27_PHY
extern void athrs27_reg_init(void);
extern void athrs27_reg_init_wan(void);
#endif

#ifdef CONFIG_VIR_PHY
extern int athr_vir_phy_setup(int unit);
extern int athr_vir_phy_is_up(int unit);
extern int athr_vir_phy_is_fdx(int unit);
extern int athr_vir_phy_speed(int unit);
extern void athr_vir_reg_init(void);
#endif

static int
ath_gmac_send(struct eth_device *dev, volatile void *packet, int length)
{
	int i;

	ath_gmac_mac_t *mac = (ath_gmac_mac_t *)dev->priv;

	ath_gmac_desc_t *f = mac->fifo_tx[mac->next_tx];

	f->pkt_size = length;
	f->res1 = 0;
	f->pkt_start_addr = virt_to_phys(packet);

	ath_gmac_tx_give_to_dma(f);
	flush_cache((u32) packet, length);
	ath_gmac_reg_wr(mac, ATH_DMA_TX_DESC, virt_to_phys(f));
	ath_gmac_reg_wr(mac, ATH_DMA_TX_CTRL, ATH_TXE);

	for (i = 0; i < MAX_WAIT; i++) {
		udelay(10);
		if (!ath_gmac_tx_owned_by_dma(f))
			break;
	}
	if (i == MAX_WAIT)
		printf("Tx Timed out\n");

	f->pkt_start_addr = 0;
	f->pkt_size = 0;

	if (++mac->next_tx >= NO_OF_TX_FIFOS)
		mac->next_tx = 0;

	return (0);
}

static int ath_gmac_recv(struct eth_device *dev)
{
	int length;
	ath_gmac_desc_t *f;
	ath_gmac_mac_t *mac;
	volatile int dmaed_pkt=0;
	int count = 0;

	mac = (ath_gmac_mac_t *)dev->priv;

	for (;;) {
		f = mac->fifo_rx[mac->next_rx];
		if (ath_gmac_rx_owned_by_dma(f)) {
			/* check if the current Descriptor is_empty is 1,But the DMAed count is not-zero
			   then move to desciprot where the packet is available */
			dmaed_pkt = (ath_gmac_reg_rd(mac, 0x194) >> 16);
			if (!dmaed_pkt) {
				break ;
			} else {
				if (f->is_empty == 1) {
					while (count < NO_OF_RX_FIFOS) {
						if (++mac->next_rx >= NO_OF_RX_FIFOS) {
							mac->next_rx = 0;
						}
						f = mac->fifo_rx[mac->next_rx];
						/*
						 * Break on valid data in the desc by checking
						 * empty bit.
						 */
						if (!f->is_empty) {
							count = 0;
							break;
						}
						count++;
					}
				}
			}
		}

		length = f->pkt_size;

		NetReceive(NetRxPackets[mac->next_rx] , length - 4);
		flush_cache((u32) NetRxPackets[mac->next_rx] , PKTSIZE_ALIGN);

		ath_gmac_reg_wr(mac,0x194,1);
		ath_gmac_rx_give_to_dma(f);

		if (++mac->next_rx >= NO_OF_RX_FIFOS)
			mac->next_rx = 0;
	}

	if (!(ath_gmac_reg_rd(mac, ATH_DMA_RX_CTRL))) {
		ath_gmac_reg_wr(mac, ATH_DMA_RX_DESC, virt_to_phys(f));
		ath_gmac_reg_wr(mac, ATH_DMA_RX_CTRL, 1);
	}

	return (0);
}

void ath_gmac_mii_setup(ath_gmac_mac_t *mac)
{
	u32 mgmt_cfg_val;

	ath_reg_wr(SWITCH_CLOCK_SPARE_ADDRESS, 0x231);
	//ath_reg_wr(SWITCH_CLOCK_SPARE_ADDRESS, 0x520);
	if ((mac->mac_unit == 1)) {
		printf("Honey Bee ---->  MAC 1 S27 PHY *\n");
		ath_reg_wr(ATH_ETH_CFG, ETH_CFG_ETH_RXDV_DELAY_SET(3) |
					ETH_CFG_ETH_RXD_DELAY_SET(3)|
					ETH_CFG_RGMII_GE0_SET(1));

		ath_reg_wr(ETH_XMII_ADDRESS, ETH_XMII_TX_INVERT_SET(1) |
						ETH_XMII_RX_DELAY_SET(2) |
						ETH_XMII_TX_DELAY_SET(1) |
						ETH_XMII_GIGE_SET(1));
        	mgmt_cfg_val = 2;
		udelay(1000);
		ath_gmac_reg_wr(mac, ATH_MAC_MII_MGMT_CFG, mgmt_cfg_val | (1 << 31));
		ath_gmac_reg_wr(mac, ATH_MAC_MII_MGMT_CFG, mgmt_cfg_val);
		return;
	}

	if (is_vir_phy()) {
		printf("Honey Bee ---->VIR PHY*\n");

		ath_reg_wr(ATH_ETH_CFG, ETH_CFG_ETH_RXDV_DELAY_SET(3) |
					ETH_CFG_ETH_RXD_DELAY_SET(3)|
					ETH_CFG_RGMII_GE0_SET(1));
		ath_reg_wr(ETH_XMII_ADDRESS, ETH_XMII_TX_INVERT_SET(1) |
						ETH_XMII_RX_DELAY_SET(2) |
						ETH_XMII_TX_DELAY_SET(1) |
						ETH_XMII_GIGE_SET(1));
		udelay(1000);
		ath_gmac_reg_wr(mac, ATH_MAC_MII_MGMT_CFG, mgmt_cfg_val | (1 << 31));
		ath_gmac_reg_wr(mac, ATH_MAC_MII_MGMT_CFG, mgmt_cfg_val);

		return;
	}
	if (is_s27()) {
        	mgmt_cfg_val = 2;
        	printf("Scorpion ---->S27 PHY*\n");
		ath_reg_wr(ETH_CFG_ADDRESS, ETH_CFG_MII_GE0_SET(1)|
                                        ETH_CFG_MII_GE0_SLAVE_SET(1));
		udelay(1000);
		ath_gmac_reg_wr(mac, ATH_MAC_MII_MGMT_CFG, mgmt_cfg_val | (1 << 31));
		ath_gmac_reg_wr(mac, ATH_MAC_MII_MGMT_CFG, mgmt_cfg_val);

	}




}


static void ath_gmac_hw_start(ath_gmac_mac_t *mac)
{


	if(mac->mac_unit)
	{
		ath_gmac_reg_rmw_set(mac, ATH_MAC_CFG2, (ATH_MAC_CFG2_PAD_CRC_EN |
					ATH_MAC_CFG2_LEN_CHECK | ATH_MAC_CFG2_IF_1000));
	} else {


		ath_gmac_reg_rmw_set(mac, ATH_MAC_CFG2, (ATH_MAC_CFG2_PAD_CRC_EN |
					ATH_MAC_CFG2_LEN_CHECK | ATH_MAC_CFG2_IF_10_100));
	}
	ath_gmac_reg_wr(mac, ATH_MAC_FIFO_CFG_0, 0x1f00);


	ath_gmac_reg_wr(mac, ATH_MAC_FIFO_CFG_1, 0x10ffff);
	ath_gmac_reg_wr(mac, ATH_MAC_FIFO_CFG_2, 0xAAA0555);

	ath_gmac_reg_rmw_set(mac, ATH_MAC_FIFO_CFG_4, 0x3ffff);
	/*
	 * Setting Drop CRC Errors, Pause Frames,Length Error frames
	 * and Multi/Broad cast frames.
	 */

	ath_gmac_reg_wr(mac, ATH_MAC_FIFO_CFG_5, 0x7eccf);

	ath_gmac_reg_wr(mac, ATH_MAC_FIFO_CFG_3, 0x1f00140);

	printf(": cfg1 %#x cfg2 %#x\n", ath_gmac_reg_rd(mac, ATH_MAC_CFG1),
			ath_gmac_reg_rd(mac, ATH_MAC_CFG2));


}

static int ath_gmac_check_link(ath_gmac_mac_t *mac)
{
	int link, duplex, speed;

	ath_gmac_phy_link(mac->mac_unit, &link);
	ath_gmac_phy_duplex(mac->mac_unit, &duplex);
	ath_gmac_phy_speed(mac->mac_unit, &speed);

	mac->link = link;

	if(!mac->link) {
		printf("%s link down\n",mac->dev->name);
		return 0;
	}

	switch (speed)
	{
		case _1000BASET:
			ath_gmac_set_mac_if(mac, 1);
			ath_gmac_reg_rmw_set(mac, ATH_MAC_FIFO_CFG_5, (1 << 19));
			break;

		case _100BASET:
			ath_gmac_set_mac_if(mac, 0);
			ath_gmac_set_mac_speed(mac, 1);
			ath_gmac_reg_rmw_clear(mac, ATH_MAC_FIFO_CFG_5, (1 << 19));
			break;

		case _10BASET:
			ath_gmac_set_mac_if(mac, 0);
			ath_gmac_set_mac_speed(mac, 0);
			ath_gmac_reg_rmw_clear(mac, ATH_MAC_FIFO_CFG_5, (1 << 19));
			break;

		default:
			printf("Invalid speed detected\n");
			return 0;
	}

	if (mac->link && (duplex == mac->duplex) && (speed == mac->speed))
		return 1;

	mac->duplex = duplex;
	mac->speed = speed;

	printf("dup %d speed %d\n", duplex, speed);

	ath_gmac_set_mac_duplex(mac,duplex);

	return 1;
}

/*
 * For every command we re-setup the ring and start with clean h/w rx state
 */
static int ath_gmac_clean_rx(struct eth_device *dev, bd_t * bd)
{

	int i;
	ath_gmac_desc_t *fr;
	ath_gmac_mac_t *mac = (ath_gmac_mac_t*)dev->priv;

	if (!ath_gmac_check_link(mac))
		return 0;

	mac->next_rx = 0;

        ath_gmac_reg_wr(mac, ATH_MAC_FIFO_CFG_0, 0x1f00);
        ath_gmac_reg_wr(mac, ATH_MAC_CFG1, (ATH_MAC_CFG1_RX_EN | ATH_MAC_CFG1_TX_EN));

	for (i = 0; i < NO_OF_RX_FIFOS; i++) {
		fr = mac->fifo_rx[i];
		fr->pkt_start_addr = virt_to_phys(NetRxPackets[i]);
		flush_cache((u32) NetRxPackets[i], PKTSIZE_ALIGN);
		ath_gmac_rx_give_to_dma(fr);
	}

	ath_gmac_reg_wr(mac, ATH_DMA_RX_DESC, virt_to_phys(mac->fifo_rx[0]));
	ath_gmac_reg_wr(mac, ATH_DMA_RX_CTRL, ATH_RXE);	/* rx start */
	udelay(1000 * 1000);


	return 1;

}

static int ath_gmac_alloc_fifo(int ndesc, ath_gmac_desc_t ** fifo)
{
	int i;
	u32 size;
	uchar *p = NULL;

	size = sizeof(ath_gmac_desc_t) * ndesc;
	size += CFG_CACHELINE_SIZE - 1;

	if ((p = malloc(size)) == NULL) {
		printf("Cant allocate fifos\n");
		return -1;
	}

	p = (uchar *) (((u32) p + CFG_CACHELINE_SIZE - 1) &
			~(CFG_CACHELINE_SIZE - 1));
	p = UNCACHED_SDRAM(p);

	for (i = 0; i < ndesc; i++)
		fifo[i] = (ath_gmac_desc_t *) p + i;

	return 0;
}

static int ath_gmac_setup_fifos(ath_gmac_mac_t *mac)
{
	int i;

	if (ath_gmac_alloc_fifo(NO_OF_TX_FIFOS, mac->fifo_tx))
		return 1;

	for (i = 0; i < NO_OF_TX_FIFOS; i++) {
		mac->fifo_tx[i]->next_desc = (i == NO_OF_TX_FIFOS - 1) ?
			virt_to_phys(mac->fifo_tx[0]) : virt_to_phys(mac->fifo_tx[i + 1]);
		ath_gmac_tx_own(mac->fifo_tx[i]);
	}

	if (ath_gmac_alloc_fifo(NO_OF_RX_FIFOS, mac->fifo_rx))
		return 1;

	for (i = 0; i < NO_OF_RX_FIFOS; i++) {
		mac->fifo_rx[i]->next_desc = (i == NO_OF_RX_FIFOS - 1) ?
			virt_to_phys(mac->fifo_rx[0]) : virt_to_phys(mac->fifo_rx[i + 1]);
	}

	return (1);
}

static void ath_gmac_halt(struct eth_device *dev)
{
	ath_gmac_mac_t *mac = (ath_gmac_mac_t *)dev->priv;
        ath_gmac_reg_rmw_clear(mac, ATH_MAC_CFG1,(ATH_MAC_CFG1_RX_EN | ATH_MAC_CFG1_TX_EN));
        ath_gmac_reg_wr(mac,ATH_MAC_FIFO_CFG_0,0x1f1f);
	ath_gmac_reg_wr(mac,ATH_DMA_RX_CTRL, 0);
	while (ath_gmac_reg_rd(mac, ATH_DMA_RX_CTRL));
}

unsigned char *
ath_gmac_mac_addr_loc(void)
{
#ifdef BOARDCAL
	/*
	 ** BOARDCAL environmental variable has the address of the cal sector
	 */

	return ((unsigned char *)BOARDCAL);

#else
	/* MAC address is store in the 2nd 4k of last sector */
	return ((unsigned char *)
			(KSEG1ADDR(ATH_SPI_BASE) + (4 * 1024) +
			 flash_info[0].size - (64 * 1024) /* sector_size */ ));
#endif
}

static void ath_gmac_get_ethaddr(struct eth_device *dev)
{
	unsigned char *eeprom;
	unsigned char *mac = dev->enetaddr;
#ifndef CONFIG_ATH_EMULATION

	eeprom = ath_gmac_mac_addr_loc();

	if (strcmp(dev->name, "eth0") == 0) {
		memcpy(mac, eeprom, 6);
	} else if (strcmp(dev->name, "eth1") == 0) {
		eeprom += 6;
		memcpy(mac, eeprom, 6);
	} else {
		printf("%s: unknown ethernet device %s\n", __func__, dev->name);
		return;
	}
	/* Use fixed address if the above address is invalid */
	if (mac[0] != 0x00 || (mac[0] == 0xff && mac[5] == 0xff))
#else
	if (1)
#endif
	{
		mac[0] = 0x00;
		mac[1] = 0x03;
		mac[2] = 0x7f;
		mac[3] = 0x09;
		mac[4] = 0x0b;
		mac[5] = 0xad;
		printf("No valid address in Flash. Using fixed address\n");
	} else {
		printf("Fetching MAC Address from 0x%p\n", __func__, eeprom);
	}
}

void
athr_mgmt_init(void)
{

#ifdef CONFIG_MGMT_INIT
	uint32_t rddata;

	rddata = ath_reg_rd(GPIO_IN_ENABLE3_ADDRESS)&
		~GPIO_IN_ENABLE3_MII_GE1_MDI_MASK;
	rddata |= GPIO_IN_ENABLE3_MII_GE1_MDI_SET(19);
	ath_reg_wr(GPIO_IN_ENABLE3_ADDRESS, rddata);

	ath_reg_rmw_clear(GPIO_OE_ADDRESS, (1 << 19));

	ath_reg_rmw_clear(GPIO_OE_ADDRESS, (1 << 17));


	rddata = ath_reg_rd(GPIO_OUT_FUNCTION4_ADDRESS) &
		~ (GPIO_OUT_FUNCTION4_ENABLE_GPIO_19_MASK |
		GPIO_OUT_FUNCTION4_ENABLE_GPIO_17_MASK);

	rddata |= GPIO_OUT_FUNCTION4_ENABLE_GPIO_19_SET(0x20) |
	GPIO_OUT_FUNCTION4_ENABLE_GPIO_17_SET(0x21);

	ath_reg_wr(GPIO_OUT_FUNCTION4_ADDRESS, rddata);
#endif
	printf ("%s ::done\n",__func__);
}

int ath_gmac_enet_initialize(bd_t * bis)
{
	struct eth_device *dev[CFG_ATH_GMAC_NMACS];
	u32 mask, mac_h, mac_l;
	int i;

	printf("%s...\n", __func__);

	/* Switch Analog and digital reset seq */
	mask = ATH_RESET_GE1_PHY |  ATH_RESET_GE0_PHY;
	ath_reg_rmw_set(RST_RESET_ADDRESS, mask);

	udelay(1000 * 100);
	mask = ATH_RESET_GE1_PHY ;
	ath_reg_rmw_clear(RST_RESET_ADDRESS, mask);

	udelay(1000 * 100);
	mask = ATH_RESET_GE0_PHY ;
	ath_reg_rmw_clear(RST_RESET_ADDRESS, mask);
	udelay(100);


	for (i = 0;i < CFG_ATH_GMAC_NMACS;i++) {

		if ((dev[i] = (struct eth_device *) malloc(sizeof (struct eth_device))) == NULL) {
			puts("malloc failed\n");
			return 0;
		}

		if ((ath_gmac_macs[i] = (ath_gmac_mac_t *) malloc(sizeof (ath_gmac_mac_t))) == NULL) {
			puts("malloc failed\n");
			return 0;
		}

		memset(ath_gmac_macs[i], 0, sizeof(ath_gmac_macs[i]));
		memset(dev[i], 0, sizeof(dev[i]));

		sprintf(dev[i]->name, "eth%d", i);
		ath_gmac_get_ethaddr(dev[i]);

		ath_gmac_macs[i]->mac_unit = i;
		ath_gmac_macs[i]->mac_base = i ? ATH_GE1_BASE : ATH_GE0_BASE ;
		ath_gmac_macs[i]->dev = dev[i];

		dev[i]->iobase = 0;
		dev[i]->init = ath_gmac_clean_rx;
		dev[i]->halt = ath_gmac_halt;
		dev[i]->send = ath_gmac_send;
		dev[i]->recv = ath_gmac_recv;
		dev[i]->priv = (void *)ath_gmac_macs[i];
	}

	for (i = 0;i < CFG_ATH_GMAC_NMACS;i++) {

		if(!i) {
			mask = (ATH_RESET_GE0_MAC | ATH_RESET_GE1_MAC | ATH_RESET_GE0_MDIO | ATH_RESET_GE1_MDIO);


			printf("%s: reset mask:%x \n", __func__, mask);

			ath_reg_rmw_set(RST_RESET_ADDRESS, mask);
			udelay(1000 * 100);

			mask = mask | ATH_RESET_GE0_MDIO | ATH_RESET_GE1_MDIO;
			ath_reg_rmw_clear(RST_RESET_ADDRESS, mask);
			udelay(1000 * 100);

			udelay(10 * 1000);
		}
#if defined(CONFIG_MGMT_INIT) && defined (CONFIG_ATHR_SWITCH_ONLY_MODE) || defined ATH_MDC_GPIO
		if (!i)
			athr_mgmt_init();

		if (ath_gmac_macs[i]->mac_unit == 0)
                        continue;
#endif
		eth_register(dev[i]);
#if(CONFIG_COMMANDS & CFG_CMD_MII)
		miiphy_register(dev[i]->name, ath_gmac_miiphy_read, ath_gmac_miiphy_write);
#endif
		ath_gmac_mii_setup(ath_gmac_macs[i]);

		/* if using header for register configuration, we have to     */
		/* configure s26 register after frame transmission is enabled */

		if (ath_gmac_macs[i]->mac_unit == 0) { /* WAN Phy */
#ifdef  CFG_ATHRS27_PHY
			printf("S27 reg init\n");
			athrs27_reg_init();
			mask = ATH_RESET_GE0_MAC;
                        ath_reg_rmw_clear(RST_RESET_ADDRESS, mask);
#endif

#ifdef CONFIG_VIR_PHY
			printf("VIRPhy reg init \n");
			athr_vir_reg_init();
#endif
		} else {
#ifdef  CFG_ATHRS27_PHY
			printf("S27 reg init\n");
			athrs27_reg_init_lan();
			mask = ATH_RESET_GE1_MAC;
                        ath_reg_rmw_clear(RST_RESET_ADDRESS, mask);
#endif

		}

	 	ath_gmac_reg_rmw_set(ath_gmac_macs[i], ATH_MAC_CFG1, ATH_MAC_CFG1_SOFT_RST
                                | ATH_MAC_CFG1_RX_RST | ATH_MAC_CFG1_TX_RST);


		ath_gmac_hw_start(ath_gmac_macs[i]);
		ath_gmac_setup_fifos(ath_gmac_macs[i]);



		udelay(100 * 1000);

		{
			unsigned char *mac = dev[i]->enetaddr;

			printf("%s: %02x:%02x:%02x:%02x:%02x:%02x\n", dev[i]->name,
					mac[0] & 0xff, mac[1] & 0xff, mac[2] & 0xff,
					mac[3] & 0xff, mac[4] & 0xff, mac[5] & 0xff);
		}
		mac_l = (dev[i]->enetaddr[4] << 8) | (dev[i]->enetaddr[5]);
		mac_h = (dev[i]->enetaddr[0] << 24) | (dev[i]->enetaddr[1] << 16) |
			(dev[i]->enetaddr[2] << 8) | (dev[i]->enetaddr[3] << 0);

		ath_gmac_reg_wr(ath_gmac_macs[i], ATH_GE_MAC_ADDR1, mac_l);
		ath_gmac_reg_wr(ath_gmac_macs[i], ATH_GE_MAC_ADDR2, mac_h);


	ath_gmac_phy_setup(ath_gmac_macs[i]->mac_unit);
		printf("%s up\n",dev[i]->name);
	}


	return 1;
}

#if (CONFIG_COMMANDS & CFG_CMD_MII)
int
ath_gmac_miiphy_read(char *devname, uint32_t phy_addr, uint8_t reg, uint16_t *data)
{
	ath_gmac_mac_t *mac   = ath_gmac_name2mac(devname);
	uint16_t      addr  = (phy_addr << ATH_ADDR_SHIFT) | reg, val;
	volatile int           rddata;
	uint16_t      ii = 0xFFFF;


	/*
	 * Check for previous transactions are complete. Added to avoid
	 * race condition while running at higher frequencies.
	 */
	do
	{
		udelay(5);
		rddata = ath_gmac_reg_rd(mac, ATH_MII_MGMT_IND) & 0x1;
	}while(rddata && --ii);

	if (ii == 0)
		printf("ERROR:%s:%d transaction failed\n",__func__,__LINE__);


	ath_gmac_reg_wr(mac, ATH_MII_MGMT_CMD, 0x0);
	ath_gmac_reg_wr(mac, ATH_MII_MGMT_ADDRESS, addr);
	ath_gmac_reg_wr(mac, ATH_MII_MGMT_CMD, ATH_MGMT_CMD_READ);

	do
	{
		udelay(5);
		rddata = ath_gmac_reg_rd(mac, ATH_MII_MGMT_IND) & 0x1;
	}while(rddata && --ii);

	if(ii==0)
		printf("Error!!! Leave ath_gmac_miiphy_read without polling correct status!\n");

	val = ath_gmac_reg_rd(mac, ATH_MII_MGMT_STATUS);
	ath_gmac_reg_wr(mac, ATH_MII_MGMT_CMD, 0x0);

	if (data != NULL)
            *data = val; 

	return val;
}

int
ath_gmac_miiphy_write(char *devname, uint32_t phy_addr, uint8_t reg, uint16_t data)
{
	ath_gmac_mac_t *mac   = ath_gmac_name2mac(devname);
	uint16_t      addr  = (phy_addr << ATH_ADDR_SHIFT) | reg;
	volatile int rddata;
	uint16_t      ii = 0xFFFF;


	/*
	 * Check for previous transactions are complete. Added to avoid
	 * race condition while running at higher frequencies.
	 */
	do {
		udelay(5);
		rddata = ath_gmac_reg_rd(mac, ATH_MII_MGMT_IND) & 0x1;
	} while (rddata && --ii);

	if (ii == 0)
		printf("ERROR:%s:%d transaction failed\n",__func__,__LINE__);

	ath_gmac_reg_wr(mac, ATH_MII_MGMT_ADDRESS, addr);
	ath_gmac_reg_wr(mac, ATH_MII_MGMT_CTRL, data);

	do {
		rddata = ath_gmac_reg_rd(mac, ATH_MII_MGMT_IND) & 0x1;
	} while (rddata && --ii);

	if (ii == 0)
		printf("Error!!! Leave ath_gmac_miiphy_write without polling correct status!\n");
	
	return 0; 
}
#endif		/* CONFIG_COMMANDS & CFG_CMD_MII */