minix/drivers/lan8710a/lan8710a.c

#include <minix/drivers.h>
#include <minix/netdriver.h>
#include <net/gen/ether.h>
#include <net/gen/eth_io.h>
#include <minix/sysutil.h>
#include <minix/board.h>
#include "assert.h"
#include "lan8710a.h"
#include "lan8710a_reg.h"

/* Local functions */
static void lan8710a_readv_s(message *m, int from_int);
static void lan8710a_writev_s(message *m, int from_int);
static void lan8710a_conf(message *m);
static void lan8710a_getstat(message *m);

static void lan8710a_init(void);
static void lan8710a_enable_interrupt(int interrupt);
static void lan8710a_interrupt(message *m);
static void lan8710a_map_regs(void);
static void lan8710a_stop(void);
static void lan8710a_dma_config_tx(u8_t desc_idx);
static void lan8710a_dma_reset_init(void);
static void lan8710a_init_addr(void);
static void lan8710a_init_desc(void);
static void lan8710a_init_mdio(void);
static int lan8710a_init_hw(void);
static void lan8710a_reset_hw();

static void lan8710a_phy_write(u32_t reg, u32_t value);
static u32_t lan8710a_phy_read(u32_t reg);

static u32_t lan8710a_reg_read(volatile u32_t *reg);
static void lan8710a_reg_write(volatile u32_t *reg, u32_t value);
static void lan8710a_reg_set(volatile u32_t *reg, u32_t value);
static void lan8710a_reg_unset(volatile u32_t *reg, u32_t value);

static void mess_reply(message *req, message *reply);
static void reply(lan8710a_t *e);

/* Local variables */
static lan8710a_t lan8710a_state;

/* SEF functions and variables. */
static void sef_local_startup(void);
static int sef_cb_init_fresh(int type, sef_init_info_t *info);
static void sef_cb_signal_handler(int signal);

/*============================================================================*
 *				main					      *
 *============================================================================*/
int
main(int argc, char *argv[])
{
	
	/* Local variables */
	message m;
	int r;
	int ipc_status;
	struct machine  machine ;

	sys_getmachine(&machine);
	if ( BOARD_IS_BB(machine.board_id)) {

		/* SEF local startup */
		env_setargs(argc, argv);
		sef_local_startup();

		/* Main driver loop */
		for (;;) {
			r = netdriver_receive(ANY, &m, &ipc_status);
			if (r != OK) {
				panic("netdriver_receive failed: %d", r);
			}

			if (is_ipc_notify(ipc_status)) {
				switch (_ENDPOINT_P(m.m_source)) {
				case HARDWARE:
					lan8710a_interrupt(&m);
					break;
				}
			} else {
				switch (m.m_type) {
				case DL_WRITEV_S:
					lan8710a_writev_s(&m, FALSE);
					break;
				case DL_READV_S:
					lan8710a_readv_s(&m, FALSE);
					break;
				case DL_CONF:
					lan8710a_conf(&m);
					break;
				case DL_GETSTAT_S:
					lan8710a_getstat(&m);
					break;
				default:
					panic("Illegal message: %d", m.m_type);
				}
			}
		}
	}
	return EXIT_SUCCESS;
}

/*============================================================================*
 *				sef_local_startup			      *
 *============================================================================*/
static void
sef_local_startup()
{
	/* Register init callbacks. */
	sef_setcb_init_fresh(sef_cb_init_fresh);
	sef_setcb_init_lu(sef_cb_init_fresh);
	sef_setcb_init_restart(sef_cb_init_fresh);

	/* Register live update callbacks. */
	sef_setcb_lu_prepare(sef_cb_lu_prepare_always_ready);
	sef_setcb_lu_state_isvalid(sef_cb_lu_state_isvalid_workfree);

	/* Register signal callbacks. */
	sef_setcb_signal_handler(sef_cb_signal_handler);

	/* Let SEF perform startup. */
	sef_startup();
}

/*============================================================================*
 *				sef_cb_init_fresh			      *
 *============================================================================*/
static int
sef_cb_init_fresh(int UNUSED( type), sef_init_info_t *UNUSED( info))
{
	/* Initialize the ethernet driver. */
	long v = 0;

	/* Clear state. */
	memset(&lan8710a_state, 0, sizeof(lan8710a_state));

	/* Initialize driver. */
	lan8710a_init();

	/* Get instance of ethernet device */
	env_parse("instance", "d", 0, &v, 0, 255);
	lan8710a_state.instance = (int) v;

	/* Announce we are up! */
	netdriver_announce();

	return OK;
}

/*============================================================================*
 *				sef_cb_signal_handler			      *
 *============================================================================*/
static void
sef_cb_signal_handler(int signal)
{
	/* Only check for termination signal, ignore anything else. */
	if (signal != SIGTERM)
		return;

	lan8710a_stop();
}

/*============================================================================*
 *				lan8710a_enable_interrupt		      *
 *============================================================================*/
static void
lan8710a_enable_interrupt(interrupt)
u8_t interrupt;
{
	int r;

	if (interrupt & RX_INT) {
		if ((r = sys_irqenable(&lan8710a_state.irq_rx_hook)) != OK) {
			panic("sys_irqenable failed: %d", r);
		}
	}
	if (interrupt & TX_INT) {
		if ((r = sys_irqenable(&lan8710a_state.irq_tx_hook)) != OK) {
			panic("sys_irqenable failed: %d", r);
		}
	}
}
/*============================================================================*
 *				lan8710a_interrupt			      *
 *============================================================================*/
static void
lan8710a_interrupt(m)
message *m;
{
	lan8710a_t *e = &lan8710a_state;
	u32_t dma_status;

	/* Check the card for interrupt reason(s). */
	u32_t rx_stat = lan8710a_reg_read(CPSW_WR_C0_RX_STAT);
	u32_t tx_stat = lan8710a_reg_read(CPSW_WR_C0_TX_STAT);
	u32_t cp;

	/* Handle interrupts. */
	if (rx_stat) {
		cp = lan8710a_reg_read(CPDMA_STRAM_RX_CP(0));

		lan8710a_readv_s(&(e->rx_message), TRUE);

		lan8710a_reg_write(CPDMA_STRAM_RX_CP(0), cp);
		lan8710a_reg_write(CPDMA_EOI_VECTOR, RX_INT);
	}
	if (tx_stat) {
		cp = lan8710a_reg_read(CPDMA_STRAM_TX_CP(0));

		/* Disabling channels, where Tx interrupt occurred */
		lan8710a_reg_set(CPDMA_TX_INTMASK_CLEAR, tx_stat);

		lan8710a_writev_s(&(e->tx_message), TRUE);

		lan8710a_reg_write(CPDMA_STRAM_TX_CP(0), cp);
		lan8710a_reg_write(CPDMA_EOI_VECTOR, TX_INT);
	}

	dma_status = lan8710a_reg_read(CPDMA_STATUS);

	if (dma_status & CPDMA_ERROR) {
		LAN8710A_DEBUG_PRINT(("CPDMA error: 0x%X, reset", dma_status));
		lan8710a_dma_reset_init();
	}

	/* Re-enable Rx interrupt. */
	if(m->m_notify.interrupts & (1 << RX_INT))
		lan8710a_enable_interrupt(RX_INT);

	/* Re-enable Tx interrupt. */
	if(m->m_notify.interrupts & (1 << TX_INT))
		lan8710a_enable_interrupt(TX_INT);
}

/*============================================================================*
 *				lan8710a_conf				      *
 *============================================================================*/
static void
lan8710a_conf(m)
message *m;
{
	message reply;

	if (!(lan8710a_state.status & LAN8710A_ENABLED) &&
						!(lan8710a_init_hw())) {
		reply.m_type = DL_CONF_REPLY;
		reply.m_netdrv_net_dl_conf.stat = ENXIO;
		mess_reply(m, &reply);
		return;
	}
	/* Reply back to INET. */
	reply.m_type = DL_CONF_REPLY;
	reply.m_netdrv_net_dl_conf.stat = OK;
	memcpy(reply.m_netdrv_net_dl_conf.hw_addr,
		lan8710a_state.address.ea_addr,
		sizeof(reply.m_netdrv_net_dl_conf.hw_addr));
	mess_reply(m, &reply);
}

/*============================================================================*
 *				lan8710a_init				      *
 *============================================================================*/
static void
lan8710a_init(void)
{
	lan8710a_map_regs();
	strlcpy(lan8710a_state.name, "lan8710a#0", LAN8710A_NAME_LEN);
	lan8710a_state.name[9] += lan8710a_state.instance;
	lan8710a_state.status |= LAN8710A_DETECTED;

	if (!(lan8710a_state.status & LAN8710A_ENABLED) &&
						!(lan8710a_init_hw())) {
		return;
	}
}

/*============================================================================*
 *				lan8710a_init_addr			      *
 *============================================================================*/
static void
lan8710a_init_addr(void)
{
	static char eakey[]= LAN8710A_ENVVAR "#_EA";
	static char eafmt[]= "x:x:x:x:x:x";
	int i;
	long v;

	/*
	 * Do we have a user defined ethernet address?
	 */
	eakey[sizeof(LAN8710A_ENVVAR)-1] = '0' + lan8710a_state.instance;

	for (i= 0; i < 6; i++) {
		if (env_parse(eakey, eafmt, i, &v, 0x00L, 0xFFL) != EP_SET)
			break;
		else
			lan8710a_state.address.ea_addr[i] = v;
	}
	if (i != 6) {
		lan8710a_state.address.ea_addr[0] =
			(lan8710a_reg_read(CTRL_MAC_ID0_HI) & 0xFF);
		lan8710a_state.address.ea_addr[1] =
			((lan8710a_reg_read(CTRL_MAC_ID0_HI) & 0xFF00) >> 8);
		lan8710a_state.address.ea_addr[2] =
			((lan8710a_reg_read(CTRL_MAC_ID0_HI) & 0xFF0000) >> 16);
		lan8710a_state.address.ea_addr[3] =
			((lan8710a_reg_read(CTRL_MAC_ID0_HI) & 0xFF000000) >> 24);
		lan8710a_state.address.ea_addr[4] =
			(lan8710a_reg_read(CTRL_MAC_ID0_LO) & 0xFF);
		lan8710a_state.address.ea_addr[5] =
			((lan8710a_reg_read(CTRL_MAC_ID0_LO) & 0xFF00) >> 8);
	}
}

/*============================================================================*
 *				lan8710a_map_regs			      *
 *============================================================================*/
static void
lan8710a_map_regs(void)
{
	struct minix_mem_range mr;
	mr.mr_base = CM_PER_BASE_ADR;
	mr.mr_limit = CM_PER_BASE_ADR + MEMORY_LIMIT;

	if (sys_privctl(SELF, SYS_PRIV_ADD_MEM, &mr) != 0) {
		panic("Unable to request permission to map memory");
	}
	lan8710a_state.regs_cp_per =
		(vir_bytes)vm_map_phys(SELF, (void *)CM_PER_BASE_ADR, 512);
	if ((void *)lan8710a_state.regs_cp_per == MAP_FAILED) {
		panic("lan8710a_state.regs_cp_per: vm_map_phys failed");
	}
	lan8710a_state.regs_cpdma_stram =
		(vir_bytes)vm_map_phys(SELF, (void *)CPDMA_STRAM_BASE_ADR, 512);
	if ((void *)lan8710a_state.regs_cpdma_stram == MAP_FAILED) {
		panic("lan8710a_state.regs_cpdma_stram: vm_map_phys failed");
	}
	lan8710a_state.regs_cpsw_cpdma =
		(vir_bytes)vm_map_phys(SELF, (void *)CPSW_CPDMA_BASE_ADR, 512);
	if ((void *)lan8710a_state.regs_cpsw_cpdma == MAP_FAILED) {
		panic("lan8710a_state.regs_cpsw_cpdma: vm_map_phys failed");
	}
	lan8710a_state.regs_cpsw_ale =
		(vir_bytes)vm_map_phys(SELF, (void *)CPSW_ALE_BASE_ADR, 256);
	if ((void *)lan8710a_state.regs_cpsw_ale == MAP_FAILED) {
		panic("lan8710a_state.regs_cpsw_ale: vm_map_phys failed");
	}
	lan8710a_state.regs_cpsw_sl =
		(vir_bytes)vm_map_phys(SELF, (void *)CPSW_SL_BASE_ADR, 512);
	if ((void *)lan8710a_state.regs_cpsw_sl == MAP_FAILED) {
		panic("lan8710a_state.regs_cpsw_sl: vm_map_phys failed");
	}
	lan8710a_state.regs_cpsw_ss =
		(vir_bytes)vm_map_phys(SELF, (void *)CPSW_SS_BASE_ADR, 512);
	if ((void *)lan8710a_state.regs_cpsw_ss == MAP_FAILED) {
		panic("lan8710a_state.regs_cpsw_ss: vm_map_phys failed");
	}
	lan8710a_state.regs_cpsw_wr =
		(vir_bytes)vm_map_phys(SELF, (void *)CPSW_WR_BASE_ADR, 512);
	if ((void *)lan8710a_state.regs_cpsw_wr == MAP_FAILED) {
		panic("lan8710a_state.regs_cpsw_wr: vm_map_phys failed");
	}
	lan8710a_state.regs_ctrl_mod =
		(vir_bytes)vm_map_phys(SELF, (void *)CTRL_MOD_BASE_ADR, 2560);
	if ((void *)lan8710a_state.regs_ctrl_mod == MAP_FAILED) {
		panic("lan8710a_state.regs_ctrl_mod: vm_map_phys failed");
	}
	lan8710a_state.regs_intc =
		(vir_bytes)vm_map_phys(SELF, (void *)INTC_BASE_ADR, 512);
	if ((void *)lan8710a_state.regs_intc == MAP_FAILED) {
		panic("lan8710a_state.regs_intc: vm_map_phys failed");
	}
	lan8710a_state.regs_mdio =
		(vir_bytes)vm_map_phys(SELF, (void *)MDIO_BASE_ADDR, 512);
	if ((void *)lan8710a_state.regs_mdio == MAP_FAILED) {
		panic("lan8710a_state.regs_mdio: vm_map_phys failed");
	}

	mr.mr_base = BEGINNING_DESC_MEM;
	mr.mr_limit = BEGINNING_DESC_MEM + DESC_MEMORY_LIMIT;

	if (sys_privctl(SELF, SYS_PRIV_ADD_MEM, &mr) != 0) {
		panic("Unable to request permission to map memory");
	}
	lan8710a_state.rx_desc_phy = BEGINNING_RX_DESC_MEM;
	lan8710a_state.tx_desc_phy = BEGINNING_TX_DESC_MEM;
	lan8710a_state.rx_desc = (lan8710a_desc_t *)vm_map_phys(SELF,
				(void *)lan8710a_state.rx_desc_phy, 1024);
	if ((void *)lan8710a_state.rx_desc == MAP_FAILED) {
		panic("lan8710a_state.rx_desc: vm_map_phys failed");
	}
	lan8710a_state.tx_desc = (lan8710a_desc_t *)vm_map_phys(SELF,
				(void *)lan8710a_state.tx_desc_phy, 1024);
	if ((void *)lan8710a_state.tx_desc == MAP_FAILED) {
		panic("lan8710a_state.tx_desc: vm_map_phys failed");
	}

	mr.mr_base = CPSW_STATS_BASE_ADR;
	mr.mr_limit = CPSW_STATS_BASE_ADR + CPSW_STATS_MEM_LIMIT;

	if (sys_privctl(SELF, SYS_PRIV_ADD_MEM, &mr) != 0) {
		panic("Unable to request permission to map memory");
	}
	lan8710a_state.regs_cpsw_stats =
		(vir_bytes)vm_map_phys(SELF, (void *)CPSW_STATS_BASE_ADR, 256);
	if ((void *)lan8710a_state.regs_cpsw_stats == MAP_FAILED) {
		panic("lan8710a_state.regs_cpsw_stats: vm_map_phys failed");
	}
}

/*============================================================================*
 *				lan8710a_getstat			      *
 *============================================================================*/
static void
lan8710a_getstat(mp)
message *mp;
{
	int r;
	eth_stat_t stats;

	stats.ets_recvErr   = lan8710a_reg_read(CPSW_STAT_RX_CRC_ERR)
				+ lan8710a_reg_read(CPSW_STAT_RX_AGNCD_ERR)
				+ lan8710a_reg_read(CPSW_STAT_RX_OVERSIZE);
	stats.ets_sendErr   = 0;
	stats.ets_OVW       = 0;
	stats.ets_CRCerr    = lan8710a_reg_read(CPSW_STAT_RX_CRC_ERR);
	stats.ets_frameAll  = lan8710a_reg_read(CPSW_STAT_RX_AGNCD_ERR);
	stats.ets_missedP   = 0;
	stats.ets_packetR   = lan8710a_reg_read(CPSW_STAT_RX_GOOD);
	stats.ets_packetT   = lan8710a_reg_read(CPSW_STAT_TX_GOOD);
	stats.ets_collision = lan8710a_reg_read(CPSW_STAT_COLLISIONS);
	stats.ets_transAb   = 0;
	stats.ets_carrSense = lan8710a_reg_read(CPSW_STAT_CARR_SENS_ERR);
	stats.ets_fifoUnder = lan8710a_reg_read(CPSW_STAT_TX_UNDERRUN);
	stats.ets_fifoOver  = lan8710a_reg_read(CPSW_STAT_RX_OVERRUN);
	stats.ets_CDheartbeat = 0;
	stats.ets_OWC = 0;

	sys_safecopyto(mp->m_source, mp->m_net_netdrv_dl_getstat_s.grant, 0,
		(vir_bytes)&stats, sizeof(stats));
	mp->m_type  = DL_STAT_REPLY;

	if ((r=ipc_send(mp->m_source, mp)) != OK) {
		panic("lan8710a_getstat: ipc_send() failed: %d", r);
	}
}

/*============================================================================*
 *				lan8710a_stop				      *
 *============================================================================*/
static void
lan8710a_stop(void)
{
	/* Reset hardware. */
	lan8710a_reset_hw();

	/* Exit driver. */
	exit(EXIT_SUCCESS);
}

/*============================================================================*
 *				lan8710a_dma_config_tx			      *
 *============================================================================*/
static void
lan8710a_dma_config_tx(desc_idx)
u8_t desc_idx;
{
	phys_bytes phys_addr;
	int i;
	for (i = 0; i < TX_DMA_CHANNELS; ++i) {
		if (!lan8710a_reg_read(CPDMA_STRAM_TX_HDP(i))) break;
	}
	if (i == TX_DMA_CHANNELS) {
		panic("There are no free TX DMA channels.");
	}

	/* Enabling only one channel Tx interrupt */
	lan8710a_reg_write(CPDMA_TX_INTMASK_SET, 1 << i);
	/* Routing only one channel Tx int to TX_PULSE signal */
	lan8710a_reg_write(CPSW_WR_C0_TX_EN, 1 << i);

	/* Setting HDP */
	phys_addr = lan8710a_state.tx_desc_phy +
					(desc_idx * sizeof(lan8710a_desc_t));
	lan8710a_reg_write(CPDMA_STRAM_TX_HDP(i), (u32_t)phys_addr);
}

/*============================================================================*
 *				lan8710a_dma_reset_init			      *
 *============================================================================*/
static void
lan8710a_dma_reset_init(void)
{
	int i;
	lan8710a_reg_write(CPDMA_SOFT_RESET, SOFT_RESET);
	while ((lan8710a_reg_read(CPDMA_SOFT_RESET) & SOFT_RESET));

	/*
	 * Initialize the HDPs (Header Description Pointers) and
	 * CPs (Completion Pointers) to NULL.
	 */
	for (i = 0; i < DMA_MAX_CHANNELS; ++i) {
		lan8710a_reg_write(CPDMA_STRAM_TX_HDP(i), 0);
		lan8710a_reg_write(CPDMA_STRAM_RX_HDP(i), 0);
		lan8710a_reg_write(CPDMA_STRAM_TX_CP(i), 0);
		lan8710a_reg_write(CPDMA_STRAM_RX_CP(i), 0);
	}

	lan8710a_reg_write(CPDMA_RX_INTMASK_CLEAR, 0xFFFFFFFF);
	lan8710a_reg_write(CPDMA_TX_INTMASK_CLEAR, 0xFFFFFFFF);

	/* Configure the CPDMA controller. */
	lan8710a_reg_set(CPDMA_RX_CONTROL, CPDMA_RX_EN); /* RX Enabled */
	lan8710a_reg_set(CPDMA_TX_CONTROL, CPDMA_TX_EN); /* TX Enabled */

	/* Enabling first channel Rx interrupt */
	lan8710a_reg_set(CPDMA_RX_INTMASK_SET, CPDMA_FIRST_CHAN_INT);

	/*
	 * Writing the address of the first buffer descriptor in the queue
	 * (nonzero value)to the channel<EFBFBD>s head descriptor pointer in the
	 * channel<EFBFBD>s Rx DMA state.
	 */
	lan8710a_reg_write(CPDMA_STRAM_RX_HDP(0),
			  (u32_t)lan8710a_state.rx_desc_phy);

	lan8710a_state.rx_desc_idx = 0;
	lan8710a_state.tx_desc_idx = 0;
}

/*============================================================================*
 *				lan8710a_init_desc			      *
 *============================================================================*/
static void
lan8710a_init_desc(void)
{
	lan8710a_desc_t *p_rx_desc;
	lan8710a_desc_t *p_tx_desc;
	phys_bytes   buf_phys_addr;
	u8_t *p_buf;
	u8_t i;

	/* Attempt to allocate. */
	if ((lan8710a_state.p_rx_buf = alloc_contig((LAN8710A_NUM_RX_DESC
			* LAN8710A_IOBUF_SIZE), AC_ALIGN4K,
			&buf_phys_addr)) == NULL) {
		panic("failed to allocate RX buffers.");
	}
	p_buf = lan8710a_state.p_rx_buf;
	for (i = 0; i < LAN8710A_NUM_RX_DESC; i++) {
		p_rx_desc = &(lan8710a_state.rx_desc[i]);
		memset(p_rx_desc, 0x0, sizeof(lan8710a_desc_t));
		p_rx_desc->pkt_len_flags = LAN8710A_DESC_FLAG_OWN;
		p_rx_desc->buffer_length_off = LAN8710A_IOBUF_SIZE;
		p_rx_desc->buffer_pointer = (u32_t)(buf_phys_addr +
						(i * LAN8710A_IOBUF_SIZE));

		p_rx_desc->next_pointer =
		   (u32_t)((i == (LAN8710A_NUM_RX_DESC - 1)) ?
			   (lan8710a_state.rx_desc_phy) :
			   (lan8710a_state.rx_desc_phy +
			     ((i + 1) * sizeof(lan8710a_desc_t))));
	}

	/* Attempt to allocate. */
	if ((lan8710a_state.p_tx_buf = alloc_contig((LAN8710A_NUM_TX_DESC
			* LAN8710A_IOBUF_SIZE), AC_ALIGN4K,
			&buf_phys_addr)) == NULL) {
		panic("failed to allocate TX buffers");
	}
	p_buf = lan8710a_state.p_tx_buf;
	for (i = 0; i < LAN8710A_NUM_TX_DESC; i++) {
		p_tx_desc = &(lan8710a_state.tx_desc[i]);
		memset(p_tx_desc, 0x0, sizeof(lan8710a_desc_t));
		p_tx_desc->buffer_pointer = (u32_t)(buf_phys_addr +
				(i * LAN8710A_IOBUF_SIZE));
	}
	lan8710a_state.rx_desc_idx = 0;
	lan8710a_state.tx_desc_idx = 0;
}

/*============================================================================*
 *				lan8710a_init_hw			      *
 *============================================================================*/
static int
lan8710a_init_hw(void)
{
	int r, i;

	lan8710a_state.status |= LAN8710A_ENABLED;

	/*
	 * Set the interrupt handler and policy. Do not automatically
	 * re-enable interrupts. Return the IRQ line number on interrupts.
	 */
	lan8710a_state.irq_rx_hook = RX_INT;
	if ((r = sys_irqsetpolicy(LAN8710A_RX_INTR, 0,
					&lan8710a_state.irq_rx_hook)) != OK) {
		panic("sys_irqsetpolicy failed: %d", r);
	}
	lan8710a_state.irq_tx_hook = TX_INT;
	if ((r = sys_irqsetpolicy(LAN8710A_TX_INTR, 0,
					&lan8710a_state.irq_tx_hook)) != OK) {
		panic("sys_irqsetpolicy failed: %d", r);
	}

	/* Reset hardware. */
	lan8710a_reset_hw();

	/*
	 * Select the Interface (GMII/RGMII/MII) Mode in the Control Module.
	 * Port1 GMII/MII Mode, Port2 not used.
	 */
	lan8710a_reg_write(GMII_SEL, (GMII2_SEL_BIT1 | GMII2_SEL_BIT0));

	/*
	 * Configure pads (PIN muxing) as per the Interface Selected using the
	 * appropriate pin muxing conf_xxx registers in the Control Module.
	 *
	 * CONF_MOD_SLEW_CTRL when 0 - Fast Mode, when 1 - Slow Mode
	 * CONF_MOD_RX_ACTIVE when 0 - Only output, when 1 - Also input
	 * CONF_MOD_PU_TYPESEL when 0 - Pull-down, when 1 - Pull-up
	 * CONF_MOD_PUDEN when 0 Pull* enabled, when 1 Pull* disabled
	 * CONF_MOD_MMODE_MII selects pin to work for MII interface
	 */
	lan8710a_reg_unset(CONF_MII1_COL, CONF_MOD_SLEW_CTRL);
	lan8710a_reg_set(CONF_MII1_COL, CONF_MOD_RX_ACTIVE);
	lan8710a_reg_set(CONF_MII1_COL, CONF_MOD_PU_TYPESEL);
	lan8710a_reg_unset(CONF_MII1_COL, CONF_MOD_PUDEN);
	lan8710a_reg_unset(CONF_MII1_COL, CONF_MOD_MMODE_MII);

	lan8710a_reg_unset(CONF_MII1_CRS, CONF_MOD_SLEW_CTRL);
	lan8710a_reg_set(CONF_MII1_CRS, CONF_MOD_RX_ACTIVE);
	lan8710a_reg_set(CONF_MII1_CRS, CONF_MOD_PU_TYPESEL);
	lan8710a_reg_unset(CONF_MII1_CRS, CONF_MOD_PUDEN);
	lan8710a_reg_unset(CONF_MII1_CRS, CONF_MOD_MMODE_MII);

	lan8710a_reg_unset(CONF_MII1_RX_ER, CONF_MOD_SLEW_CTRL);
	lan8710a_reg_set(CONF_MII1_RX_ER, CONF_MOD_RX_ACTIVE);
	lan8710a_reg_set(CONF_MII1_RX_ER, CONF_MOD_PU_TYPESEL);
	lan8710a_reg_unset(CONF_MII1_RX_ER, CONF_MOD_PUDEN);
	lan8710a_reg_unset(CONF_MII1_RX_ER, CONF_MOD_MMODE_MII);

	lan8710a_reg_unset(CONF_MII1_TX_EN, CONF_MOD_SLEW_CTRL);
	lan8710a_reg_unset(CONF_MII1_TX_EN, CONF_MOD_RX_ACTIVE);
	lan8710a_reg_set(CONF_MII1_TX_EN, CONF_MOD_PUDEN);
	lan8710a_reg_unset(CONF_MII1_TX_EN, CONF_MOD_MMODE_MII);

	lan8710a_reg_unset(CONF_MII1_RX_DV, CONF_MOD_SLEW_CTRL);
	lan8710a_reg_set(CONF_MII1_RX_DV, CONF_MOD_RX_ACTIVE);
	lan8710a_reg_set(CONF_MII1_RX_DV, CONF_MOD_PU_TYPESEL);
	lan8710a_reg_unset(CONF_MII1_RX_DV, CONF_MOD_PUDEN);
	lan8710a_reg_unset(CONF_MII1_RX_DV, CONF_MOD_MMODE_MII);

	lan8710a_reg_unset(CONF_MII1_TXD3, CONF_MOD_SLEW_CTRL);
	lan8710a_reg_unset(CONF_MII1_TXD3, CONF_MOD_RX_ACTIVE);
	lan8710a_reg_set(CONF_MII1_TXD3, CONF_MOD_PUDEN);
	lan8710a_reg_unset(CONF_MII1_TXD3, CONF_MOD_MMODE_MII);

	lan8710a_reg_unset(CONF_MII1_TXD2, CONF_MOD_SLEW_CTRL);
	lan8710a_reg_unset(CONF_MII1_TXD2, CONF_MOD_RX_ACTIVE);
	lan8710a_reg_set(CONF_MII1_TXD2, CONF_MOD_PUDEN);
	lan8710a_reg_unset(CONF_MII1_TXD2, CONF_MOD_MMODE_MII);

	lan8710a_reg_unset(CONF_MII1_TXD1, CONF_MOD_SLEW_CTRL);
	lan8710a_reg_unset(CONF_MII1_TXD1, CONF_MOD_RX_ACTIVE);
	lan8710a_reg_set(CONF_MII1_TXD1, CONF_MOD_PUDEN);
	lan8710a_reg_unset(CONF_MII1_TXD1, CONF_MOD_MMODE_MII);

	lan8710a_reg_unset(CONF_MII1_TXD0, CONF_MOD_SLEW_CTRL);
	lan8710a_reg_unset(CONF_MII1_TXD0, CONF_MOD_RX_ACTIVE);
	lan8710a_reg_set(CONF_MII1_TXD0, CONF_MOD_PUDEN);
	lan8710a_reg_unset(CONF_MII1_TXD0, CONF_MOD_MMODE_MII);

	lan8710a_reg_unset(CONF_MII1_TX_CLK, CONF_MOD_SLEW_CTRL);
	lan8710a_reg_set(CONF_MII1_TX_CLK, CONF_MOD_RX_ACTIVE);
	lan8710a_reg_set(CONF_MII1_TX_CLK, CONF_MOD_PUDEN);
	lan8710a_reg_unset(CONF_MII1_TX_CLK, CONF_MOD_MMODE_MII);

	lan8710a_reg_unset(CONF_MII1_RX_CLK, CONF_MOD_SLEW_CTRL);
	lan8710a_reg_set(CONF_MII1_RX_CLK, CONF_MOD_RX_ACTIVE);
	lan8710a_reg_set(CONF_MII1_RX_CLK, CONF_MOD_PUDEN);
	lan8710a_reg_unset(CONF_MII1_RX_CLK, CONF_MOD_MMODE_MII);

	lan8710a_reg_unset(CONF_MII1_RXD3, CONF_MOD_SLEW_CTRL);
	lan8710a_reg_set(CONF_MII1_RXD3, CONF_MOD_RX_ACTIVE);
	lan8710a_reg_set(CONF_MII1_RXD3, CONF_MOD_PU_TYPESEL);
	lan8710a_reg_unset(CONF_MII1_RXD3, CONF_MOD_PUDEN);
	lan8710a_reg_unset(CONF_MII1_RXD3, CONF_MOD_MMODE_MII);

	lan8710a_reg_unset(CONF_MII1_RXD2, CONF_MOD_SLEW_CTRL);
	lan8710a_reg_set(CONF_MII1_RXD2, CONF_MOD_RX_ACTIVE);
	lan8710a_reg_set(CONF_MII1_RXD2, CONF_MOD_PU_TYPESEL);
	lan8710a_reg_unset(CONF_MII1_RXD2, CONF_MOD_PUDEN);
	lan8710a_reg_unset(CONF_MII1_RXD2, CONF_MOD_MMODE_MII);

	lan8710a_reg_unset(CONF_MII1_RXD1, CONF_MOD_SLEW_CTRL);
	lan8710a_reg_set(CONF_MII1_RXD1, CONF_MOD_RX_ACTIVE);
	lan8710a_reg_set(CONF_MII1_RXD1, CONF_MOD_PU_TYPESEL);
	lan8710a_reg_unset(CONF_MII1_RXD1, CONF_MOD_PUDEN);
	lan8710a_reg_unset(CONF_MII1_RXD1, CONF_MOD_MMODE_MII);

	lan8710a_reg_unset(CONF_MII1_RXD0, CONF_MOD_SLEW_CTRL);
	lan8710a_reg_set(CONF_MII1_RXD0, CONF_MOD_RX_ACTIVE);
	lan8710a_reg_set(CONF_MII1_RXD0, CONF_MOD_PU_TYPESEL);
	lan8710a_reg_unset(CONF_MII1_RXD0, CONF_MOD_PUDEN);
	lan8710a_reg_unset(CONF_MII1_RXD0, CONF_MOD_MMODE_MII);

	lan8710a_reg_unset(CONF_MDIO, CONF_MOD_SLEW_CTRL);
	lan8710a_reg_set(CONF_MDIO, CONF_MOD_RX_ACTIVE);
	lan8710a_reg_set(CONF_MDIO, CONF_MOD_PU_TYPESEL);
	lan8710a_reg_unset(CONF_MDIO, CONF_MOD_PUDEN);
	lan8710a_reg_unset(CONF_MDIO, CONF_MOD_MMODE_MII);

	lan8710a_reg_unset(CONF_MDC, CONF_MOD_SLEW_CTRL);
	lan8710a_reg_unset(CONF_MDC, CONF_MOD_RX_ACTIVE);
	lan8710a_reg_set(CONF_MDC, CONF_MOD_PUDEN);
	lan8710a_reg_unset(CONF_MDC, CONF_MOD_MMODE_MII);

	/* Apply soft reset to 3PSW Subsytem, CPSW_3G, CPGMAC_SL, and CPDMA. */
	lan8710a_reg_write(CPSW_SS_SOFT_RESET, SOFT_RESET);
	lan8710a_reg_write(CPSW_SL_SOFT_RESET(1), SOFT_RESET);
	lan8710a_reg_write(CPSW_SL_SOFT_RESET(2), SOFT_RESET);

	/* Wait for software resets completion */
	while ((lan8710a_reg_read(CPSW_SS_SOFT_RESET) & SOFT_RESET) ||
		(lan8710a_reg_read(CPSW_SL_SOFT_RESET(1)) & SOFT_RESET) ||
		(lan8710a_reg_read(CPSW_SL_SOFT_RESET(2)) & SOFT_RESET));

	/* Configure the Statistics Port Enable register. */
	/* Enable port 0 and 1 statistics. */
	lan8710a_reg_write(CPSW_SS_STAT_PORT_EN, (CPSW_P1_STAT_EN |
							CPSW_P0_STAT_EN));

	/*
	 * Configure the ALE.
	 * Enabling Ale.
	 * All packets received on ports 1 are
	 * sent to the host (only to the host).
	 */
	lan8710a_reg_write(CPSW_ALE_CONTROL, (CPSW_ALE_ENABLE |
						CPSW_ALE_BYPASS));
	/* Port 0 (host) in forwarding mode. */
	lan8710a_reg_write(CPSW_ALE_PORTCTL0, CPSW_ALE_PORT_FWD);
	/* Port 1 in forwarding mode. */
	lan8710a_reg_write(CPSW_ALE_PORTCTL1, CPSW_ALE_PORT_FWD);

	/*
	 * Configure CPSW_SL Register
	 * Full duplex mode.
	 */
	lan8710a_reg_write(CPSW_SL_MACCONTROL(1), CPSW_SL_FULLDUPLEX);

	/* Initialize MDIO Protocol */
	lan8710a_init_mdio();

	/* Getting MAC Address */
	lan8710a_init_addr();

	/* Initialize descriptors */
	lan8710a_init_desc();

	/* Reset and initialize CPDMA */
	lan8710a_dma_reset_init();

	/*
	 * Configure the Interrupts.
	 * Routing all channel Rx int to RX_PULSE signal.
	 */
	lan8710a_reg_set(CPSW_WR_C0_RX_EN, CPSW_FIRST_CHAN_INT);

	/*
	 * Enabling LAN8710A Auto-negotiation
	 */
	lan8710a_phy_write(LAN8710A_CTRL_REG, LAN8710A_AUTO_NEG);

	/* Waiting for auto-negotiaion completion. */
	for (i = 0; !(lan8710a_phy_read(LAN8710A_STATUS_REG) &
					LAN8710A_AUTO_NEG_COMPL); ++i) {
		if (i == 100) {
			LAN8710A_DEBUG_PRINT(("Autonegotiation failed"));
			break;
		}
		tickdelay(100);
	}

	/* GMII RX and TX release from reset. */
	lan8710a_reg_set(CPSW_SL_MACCONTROL(1), CPSW_SL_GMII_EN);
	
	/* Enable interrupts. */
	lan8710a_enable_interrupt(RX_INT | TX_INT);

	return TRUE;
}

/*============================================================================*
 *				lan8710a_init_mdio			      *
 *============================================================================*/
static void
lan8710a_init_mdio(void)
{
	u16_t address = 0;
	u32_t r;

	/* Clearing MDIOCONTROL register */
	lan8710a_reg_write(MDIOCONTROL, 0);
	/* Configure the PREAMBLE and CLKDIV in the MDIO control register */
	lan8710a_reg_unset(MDIOCONTROL, MDIO_PREAMBLE); /* CLKDIV default */
	/* Enable sending MDIO frame preambles */
	lan8710a_reg_set(MDIOCONTROL, (MDCLK_DIVIDER | MDIO_ENABLE));
	/* Enable the MDIO module by setting the ENABLE bit in MDIOCONTROL */

	while (!(r = lan8710a_reg_read(MDIOALIVE)));

	/* Get PHY address */
	while (r >>= 1) {
		++address;
	}
	lan8710a_state.phy_address = address;

	/* Setup appropiate address in MDIOUSERPHYSEL0 */
	lan8710a_reg_set(MDIOUSERPHYSEL0, address);
}

/*============================================================================*
 *				lan8710a_writev_s			      *
 *============================================================================*/
static void
lan8710a_writev_s(mp, from_int)
message *mp;
int from_int;
{
	iovec_s_t iovec[LAN8710A_IOVEC_NR];
	lan8710a_t *e = &lan8710a_state;
	lan8710a_desc_t *p_tx_desc;
	u8_t *p_buf;
	int r, size, buf_data_len, i;

	/* Are we called from the interrupt handler? */
	if (!from_int) {
		/* We cannot write twice simultaneously. */
		assert(!(e->status & LAN8710A_WRITING));

		/* Copy write message. */
		e->tx_message = *mp;
		e->client = mp->m_source;
		e->status |= LAN8710A_WRITING;

		/* verify vector count */
		assert(mp->m_net_netdrv_dl_writev_s.count > 0);
		assert(mp->m_net_netdrv_dl_writev_s.count < LAN8710A_IOVEC_NR);

		/*
		 * Copy the I/O vector table.
		 */
		if ((r = sys_safecopyfrom(mp->m_source,
				mp->m_net_netdrv_dl_writev_s.grant, 0,
				(vir_bytes) iovec,
				mp->m_net_netdrv_dl_writev_s.count *
				sizeof(iovec_s_t))) != OK) {
			panic("sys_safecopyfrom() failed: %d", r);
		}
		/* setup descriptors */
		p_tx_desc = &(e->tx_desc[e->tx_desc_idx]);

		/*
		 * Check if descriptor is available for host
		 * and drop the packet if not.
		 */
		if (LAN8710A_DESC_FLAG_OWN & p_tx_desc->pkt_len_flags) {
			panic("No available transmit descriptor.");
		}

		/* virtual address of buffer */
		p_buf = e->p_tx_buf + e->tx_desc_idx * LAN8710A_IOBUF_SIZE;
		buf_data_len = 0;
		for (i = 0; i < mp->m_net_netdrv_dl_writev_s.count; i++) {
			if ((buf_data_len + iovec[i].iov_size)
			     > LAN8710A_IOBUF_SIZE) {
				panic("packet too long");
			}

			/* copy data to buffer */
			size = iovec[i].iov_size
				< (LAN8710A_IOBUF_SIZE - buf_data_len) ?
				    iovec[i].iov_size
				    : (LAN8710A_IOBUF_SIZE - buf_data_len);

			/* Copy bytes to TX queue buffers. */
			if ((r = sys_safecopyfrom(mp->m_source,
					iovec[i].iov_grant, 0,
					(vir_bytes) p_buf, size)) != OK) {
				panic("sys_safecopyfrom() failed: %d", r);
			}
			p_buf += size;
			buf_data_len += size;
		}

		/* set descriptor length */
		p_tx_desc->buffer_length_off = buf_data_len;
		/* set flags */
		p_tx_desc->pkt_len_flags = (LAN8710A_DESC_FLAG_OWN |
						LAN8710A_DESC_FLAG_SOP |
						LAN8710A_DESC_FLAG_EOP |
						TX_DESC_TO_PORT1 |
						TX_DESC_TO_PORT_EN);
		p_tx_desc->pkt_len_flags |= buf_data_len;

		/* setup DMA transfer */
		lan8710a_dma_config_tx(e->tx_desc_idx);

		e->tx_desc_idx++;
		if (LAN8710A_NUM_TX_DESC == e->tx_desc_idx) {
			e->tx_desc_idx = 0;
		}
	} else {
		e->status |= LAN8710A_TRANSMIT;
	}
	reply(e);
}

/*============================================================================*
 *				lan8710a_readv_s			      *
 *============================================================================*/
static void
lan8710a_readv_s(mp, from_int)
message *mp;
int from_int;
{
	iovec_s_t iovec[LAN8710A_IOVEC_NR];
	lan8710a_t *e = &lan8710a_state;
	lan8710a_desc_t *p_rx_desc;
	u32_t  flags;
	u8_t *p_buf;
	u16_t pkt_data_len;
	u16_t buf_bytes, buf_len;
	int i, r, size;

	/* Are we called from the interrupt handler? */
	if (!from_int) {
		e->rx_message = *mp;
		e->client = mp->m_source;
		e->status |= LAN8710A_READING;
		e->rx_size = 0;

		assert(e->rx_message.m_net_netdrv_dl_readv_s.count > 0);
		assert(e->rx_message.m_net_netdrv_dl_readv_s.count < LAN8710A_IOVEC_NR);
	}
	if (e->status & LAN8710A_READING) {
		/*
		 * Copy the I/O vector table first.
		 */
		if ((r = sys_safecopyfrom(e->rx_message.m_source,
				e->rx_message.m_net_netdrv_dl_readv_s.grant, 0,
				(vir_bytes) iovec,
				e->rx_message.m_net_netdrv_dl_readv_s.count *
				    sizeof(iovec_s_t))) != OK) {
			panic("sys_safecopyfrom() failed: %d", r);
		}

		/*
		 * Only handle one packet at a time.
		 */
		p_rx_desc = &(e->rx_desc[e->rx_desc_idx]);
		/* find next OWN descriptor with SOP flag */
		while ((0 == (LAN8710A_DESC_FLAG_SOP &
					p_rx_desc->pkt_len_flags)) &&
				(0 == (LAN8710A_DESC_FLAG_OWN &
					p_rx_desc->pkt_len_flags))) {
			p_rx_desc->buffer_length_off = LAN8710A_IOBUF_SIZE;
			/* set ownership of current descriptor to EMAC */
			p_rx_desc->pkt_len_flags = LAN8710A_DESC_FLAG_OWN;

			e->rx_desc_idx++;
			if (LAN8710A_NUM_RX_DESC == e->rx_desc_idx)
				e->rx_desc_idx = 0;
			p_rx_desc = &(e->rx_desc[e->rx_desc_idx]);
		}
		if (0 == (LAN8710A_DESC_FLAG_SOP & p_rx_desc->pkt_len_flags)) {
			/* SOP was not found */
			reply(e);
			return;
		}

		/*
		 * Copy to vector elements.
		 */
		pkt_data_len = 0;
		buf_bytes = 0;
		p_buf = e->p_rx_buf + e->rx_desc_idx * LAN8710A_IOBUF_SIZE;
		for (i = 0; i < e->rx_message.m_net_netdrv_dl_readv_s.count; i++) {
			buf_len = p_rx_desc->buffer_length_off & 0xFFFF;
			if (buf_bytes == buf_len) {
				/* Whole buffer move to the next descriptor */
				p_rx_desc->buffer_length_off =
							LAN8710A_IOBUF_SIZE;
				/* set ownership of current desc to EMAC */
				p_rx_desc->pkt_len_flags =
							LAN8710A_DESC_FLAG_OWN;
				buf_bytes = 0;

				e->rx_desc_idx++;
				if (LAN8710A_NUM_RX_DESC == e->rx_desc_idx)
					e->rx_desc_idx = 0;
				p_rx_desc = &(e->rx_desc[e->rx_desc_idx]);
				p_buf = e->p_rx_buf + (e->rx_desc_idx *
					    LAN8710A_IOBUF_SIZE) +
					    (p_rx_desc->buffer_length_off >> 16);
				buf_len = p_rx_desc->buffer_length_off & 0xFFFF;
			}
			size = iovec[i].iov_size < (buf_len - buf_bytes) ?
				   iovec[i].iov_size :
				   (buf_len - buf_bytes);

			if ((r = sys_safecopyto(e->rx_message.m_source,
						iovec[i].iov_grant, 0,
						(vir_bytes) p_buf,
						size)) != OK) {
				panic("sys_safecopyto() failed: %d", r);
			}
			p_buf += size;
			buf_bytes += size;
			pkt_data_len += size;

			/* if EOP flag is set -> stop processing */
			if ((LAN8710A_DESC_FLAG_EOP & p_rx_desc->pkt_len_flags) &&
							(buf_bytes == buf_len)) {
				/* end of packet */
				break;
			}
		}
		do {
			/* reset owned descriptors up to EOP flag */
			flags = p_rx_desc->pkt_len_flags;
			p_rx_desc->buffer_length_off = LAN8710A_IOBUF_SIZE;
			/* set ownership of current descriptor to EMAC */
			p_rx_desc->pkt_len_flags = LAN8710A_DESC_FLAG_OWN;

			e->rx_desc_idx++;
			if (LAN8710A_NUM_RX_DESC == e->rx_desc_idx)
				e->rx_desc_idx = 0;

			p_rx_desc = &(e->rx_desc[e->rx_desc_idx]);
		}
		while (0 == (flags & LAN8710A_DESC_FLAG_EOP));

		/*
		 * Update state.
		 */
		e->status |= LAN8710A_RECEIVED;
		e->rx_size = pkt_data_len;

	}
	reply(e);
}

/*============================================================================*
 *				lan8710a_phy_write			      *
 *============================================================================*/
static void
lan8710a_phy_write(reg, value)
u32_t reg;
u32_t value;
{
	if (!(lan8710a_reg_read(MDIOUSERACCESS0) & MDIO_GO)) {
		/* Clearing MDIOUSERACCESS0 register */
		lan8710a_reg_write(MDIOUSERACCESS0, 0);
		/* Setting proper values in MDIOUSERACCESS0 */
		lan8710a_reg_set(MDIOUSERACCESS0, MDIO_WRITE);
		lan8710a_reg_set(MDIOUSERACCESS0, reg << MDIO_REGADR);
		lan8710a_reg_set(MDIOUSERACCESS0,
				lan8710a_state.phy_address << MDIO_PHYADR);
		/* Data written only 16 bits. */
		lan8710a_reg_set(MDIOUSERACCESS0, (value & 0xFFFF) << MDIO_DATA);
		lan8710a_reg_set(MDIOUSERACCESS0, MDIO_GO);

		/* Waiting for writing completion */
		while (lan8710a_reg_read(MDIOUSERACCESS0) & MDIO_GO);
	}
}

/*============================================================================*
 *				lan8710a_phy_read			      *
 *============================================================================*/
static u32_t
lan8710a_phy_read(reg)
u32_t reg;
{
	u32_t value = 0xFFFFFFFF;

	if (!(lan8710a_reg_read(MDIOUSERACCESS0) & MDIO_GO)) {
		/* Clearing MDIOUSERACCESS0 register */
		lan8710a_reg_write(MDIOUSERACCESS0, 0);
		/* Setting proper values in MDIOUSERACCESS0 */
		lan8710a_reg_unset(MDIOUSERACCESS0, MDIO_WRITE);
		/* Reg number must be 5 bit long */
		lan8710a_reg_set(MDIOUSERACCESS0, (reg & 0x1F) << MDIO_REGADR);
		/* Addr must be 5 bit long */
		lan8710a_reg_set(MDIOUSERACCESS0,
			(lan8710a_state.phy_address & 0x1F) << MDIO_PHYADR);
		lan8710a_reg_set(MDIOUSERACCESS0, MDIO_GO);

		/* Waiting for reading completion */
		while ((lan8710a_reg_read(MDIOUSERACCESS0) & MDIO_GO)
			&& !(lan8710a_reg_read(MDIOUSERACCESS0) & MDIO_ACK));

		/* Reading data */
		value = lan8710a_reg_read(MDIOUSERACCESS0) & 0xFFFF;
	}
	return value;
}

/*============================================================================*
 *				lan8710a_reset_hw			      *
 *============================================================================*/
static void
lan8710a_reset_hw()
{
	/* Assert a Device Reset signal. */
	lan8710a_phy_write(LAN8710A_CTRL_REG, LAN8710A_SOFT_RESET);

	/* Waiting for reset completion. */
	while (lan8710a_phy_read(LAN8710A_CTRL_REG) & LAN8710A_SOFT_RESET);
}

/*============================================================================*
 *				lan8710a_reg_read			      *
 *============================================================================*/
static u32_t
lan8710a_reg_read(reg)
volatile u32_t *reg;
{
	u32_t value;

	/* Read from memory mapped register. */
	value = *reg;

	/* Return the result. */
	return value;
}

/*============================================================================*
 *				lan8710a_reg_write			      *
 *============================================================================*/
static void
lan8710a_reg_write(reg, value)
volatile u32_t *reg;
u32_t value;
{
	/* Write to memory mapped register. */
	*reg = value;
}

/*============================================================================*
 *				lan8710a_reg_set			      *
 *============================================================================*/
static void
lan8710a_reg_set(reg, value)
volatile u32_t *reg;
u32_t value;
{
	u32_t data;

	/* First read the current value. */
	data = lan8710a_reg_read(reg);

	/* Set value, and write back. */
	lan8710a_reg_write(reg, data | value);
}

/*============================================================================*
 *				lan8710a_reg_unset			      *
 *============================================================================*/
static void
lan8710a_reg_unset(reg, value)
volatile u32_t *reg;
u32_t value;
{
	u32_t data;

	/* First read the current value. */
	data = lan8710a_reg_read(reg);

	/* Unset value, and write back. */
	lan8710a_reg_write(reg, data & ~value);
}

/*============================================================================*
 *				mess_reply				      *
 *============================================================================*/
static void
mess_reply(req, reply)
message *req;message *reply;
{
	if (ipc_send(req->m_source, reply) != OK) {
		panic("unable to send reply message");
	}
}

/*============================================================================*
 *				reply					      *
 *============================================================================*/
static void
reply(e)
lan8710a_t *e;
{
	message msg;
	int r;

	/* Only reply to client for read/write request. */
	if (!(e->status & LAN8710A_READING ||
			e->status & LAN8710A_WRITING)) {
		return;
	}
	/* Construct reply message. */
	msg.m_type   = DL_TASK_REPLY;
	msg.m_netdrv_net_dl_task.flags = DL_NOFLAGS;
	msg.m_netdrv_net_dl_task.count = 0;

	/* Did we successfully receive packet(s)? */
	if (e->status & LAN8710A_READING &&
	e->status & LAN8710A_RECEIVED) {
		msg.m_netdrv_net_dl_task.flags |= DL_PACK_RECV;
		msg.m_netdrv_net_dl_task.count =
			 e->rx_size >= ETH_MIN_PACK_SIZE ?
				e->rx_size : ETH_MIN_PACK_SIZE;

		/* Clear flags. */
		e->status &= ~(LAN8710A_READING | LAN8710A_RECEIVED);
	}
	/* Did we successfully transmit packet(s)? */
	if (e->status & LAN8710A_TRANSMIT &&
		e->status & LAN8710A_WRITING) {
		msg.m_netdrv_net_dl_task.flags |= DL_PACK_SEND;

		/* Clear flags. */
		e->status &= ~(LAN8710A_WRITING | LAN8710A_TRANSMIT);
	}

	/* Acknowledge to INET. */
	if ((r = ipc_send(e->client, &msg) != OK)) {
		panic("ipc_send() failed: %d", r);
	}
}