Merge with /home/wd/git/u-boot/custodian/u-boot-arm

1 files changed, 983 insertions, 0 deletions

diff --git a/drivers/enc28j60.c b/drivers/enc28j60.c
new file mode 100755
index 0000000000..36b084c191
--- /dev/null
+++ b/drivers/enc28j60.c
@@ -0,0 +1,983 @@
+/*
+ * 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>
+#ifdef CONFIG_ENC28J60
+#include <net.h>
+#include <asm/arch/hardware.h>
+#include <asm/arch/spi.h>
+
+/*
+ * Control Registers in Bank 0
+ */
+
+#define CTL_REG_ERDPTL	 0x00
+#define CTL_REG_ERDPTH	 0x01
+#define CTL_REG_EWRPTL	 0x02
+#define CTL_REG_EWRPTH	 0x03
+#define CTL_REG_ETXSTL	 0x04
+#define CTL_REG_ETXSTH	 0x05
+#define CTL_REG_ETXNDL	 0x06
+#define CTL_REG_ETXNDH	 0x07
+#define CTL_REG_ERXSTL	 0x08
+#define CTL_REG_ERXSTH	 0x09
+#define CTL_REG_ERXNDL	 0x0A
+#define CTL_REG_ERXNDH	 0x0B
+#define CTL_REG_ERXRDPTL 0x0C
+#define CTL_REG_ERXRDPTH 0x0D
+#define CTL_REG_ERXWRPTL 0x0E
+#define CTL_REG_ERXWRPTH 0x0F
+#define CTL_REG_EDMASTL  0x10
+#define CTL_REG_EDMASTH  0x11
+#define CTL_REG_EDMANDL  0x12
+#define CTL_REG_EDMANDH  0x13
+#define CTL_REG_EDMADSTL 0x14
+#define CTL_REG_EDMADSTH 0x15
+#define CTL_REG_EDMACSL  0x16
+#define CTL_REG_EDMACSH  0x17
+/* these are common in all banks */
+#define CTL_REG_EIE	 0x1B
+#define CTL_REG_EIR	 0x1C
+#define CTL_REG_ESTAT	 0x1D
+#define CTL_REG_ECON2	 0x1E
+#define CTL_REG_ECON1	 0x1F
+
+/*
+ * Control Registers in Bank 1
+ */
+
+#define CTL_REG_EHT0	0x00
+#define CTL_REG_EHT1	0x01
+#define CTL_REG_EHT2	0x02
+#define CTL_REG_EHT3	0x03
+#define CTL_REG_EHT4	0x04
+#define CTL_REG_EHT5	0x05
+#define CTL_REG_EHT6	0x06
+#define CTL_REG_EHT7	0x07
+#define CTL_REG_EPMM0	0x08
+#define CTL_REG_EPMM1	0x09
+#define CTL_REG_EPMM2	0x0A
+#define CTL_REG_EPMM3	0x0B
+#define CTL_REG_EPMM4	0x0C
+#define CTL_REG_EPMM5	0x0D
+#define CTL_REG_EPMM6	0x0E
+#define CTL_REG_EPMM7	0x0F
+#define CTL_REG_EPMCSL	0x10
+#define CTL_REG_EPMCSH	0x11
+#define CTL_REG_EPMOL	0x14
+#define CTL_REG_EPMOH	0x15
+#define CTL_REG_EWOLIE	0x16
+#define CTL_REG_EWOLIR	0x17
+#define CTL_REG_ERXFCON 0x18
+#define CTL_REG_EPKTCNT 0x19
+
+/*
+ * Control Registers in Bank 2
+ */
+
+#define CTL_REG_MACON1	 0x00
+#define CTL_REG_MACON2	 0x01
+#define CTL_REG_MACON3	 0x02
+#define CTL_REG_MACON4	 0x03
+#define CTL_REG_MABBIPG  0x04
+#define CTL_REG_MAIPGL	 0x06
+#define CTL_REG_MAIPGH	 0x07
+#define CTL_REG_MACLCON1 0x08
+#define CTL_REG_MACLCON2 0x09
+#define CTL_REG_MAMXFLL  0x0A
+#define CTL_REG_MAMXFLH  0x0B
+#define CTL_REG_MAPHSUP  0x0D
+#define CTL_REG_MICON	 0x11
+#define CTL_REG_MICMD	 0x12
+#define CTL_REG_MIREGADR 0x14
+#define CTL_REG_MIWRL	 0x16
+#define CTL_REG_MIWRH	 0x17
+#define CTL_REG_MIRDL	 0x18
+#define CTL_REG_MIRDH	 0x19
+
+/*
+ * Control Registers in Bank 3
+ */
+
+#define CTL_REG_MAADR1	0x00
+#define CTL_REG_MAADR0	0x01
+#define CTL_REG_MAADR3	0x02
+#define CTL_REG_MAADR2	0x03
+#define CTL_REG_MAADR5	0x04
+#define CTL_REG_MAADR4	0x05
+#define CTL_REG_EBSTSD	0x06
+#define CTL_REG_EBSTCON 0x07
+#define CTL_REG_EBSTCSL 0x08
+#define CTL_REG_EBSTCSH 0x09
+#define CTL_REG_MISTAT	0x0A
+#define CTL_REG_EREVID	0x12
+#define CTL_REG_ECOCON	0x15
+#define CTL_REG_EFLOCON 0x17
+#define CTL_REG_EPAUSL	0x18
+#define CTL_REG_EPAUSH	0x19
+
+
+/*
+ * PHY Register
+ */
+
+#define PHY_REG_PHID1 0x02
+#define PHY_REG_PHID2 0x03
+/* taken from the Linux driver */
+#define PHY_REG_PHCON1 0x00
+#define PHY_REG_PHCON2 0x10
+#define PHY_REG_PHLCON 0x14
+
+/*
+ * Receive Filter Register (ERXFCON) bits
+ */
+
+#define ENC_RFR_UCEN  0x80
+#define ENC_RFR_ANDOR 0x40
+#define ENC_RFR_CRCEN 0x20
+#define ENC_RFR_PMEN  0x10
+#define ENC_RFR_MPEN  0x08
+#define ENC_RFR_HTEN  0x04
+#define ENC_RFR_MCEN  0x02
+#define ENC_RFR_BCEN  0x01
+
+/*
+ * ECON1 Register Bits
+ */
+
+#define ENC_ECON1_TXRST  0x80
+#define ENC_ECON1_RXRST  0x40
+#define ENC_ECON1_DMAST  0x20
+#define ENC_ECON1_CSUMEN 0x10
+#define ENC_ECON1_TXRTS  0x08
+#define ENC_ECON1_RXEN	 0x04
+#define ENC_ECON1_BSEL1  0x02
+#define ENC_ECON1_BSEL0  0x01
+
+/*
+ * ECON2 Register Bits
+ */
+#define ENC_ECON2_AUTOINC 0x80
+#define ENC_ECON2_PKTDEC  0x40
+#define ENC_ECON2_PWRSV   0x20
+#define ENC_ECON2_VRPS	  0x08
+
+/*
+ * EIR Register Bits
+ */
+#define ENC_EIR_PKTIF  0x40
+#define ENC_EIR_DMAIF  0x20
+#define ENC_EIR_LINKIF 0x10
+#define ENC_EIR_TXIF   0x08
+#define ENC_EIR_WOLIF  0x04
+#define ENC_EIR_TXERIF 0x02
+#define ENC_EIR_RXERIF 0x01
+
+/*
+ * ESTAT Register Bits
+ */
+
+#define ENC_ESTAT_INT	  0x80
+#define ENC_ESTAT_LATECOL 0x10
+#define ENC_ESTAT_RXBUSY  0x04
+#define ENC_ESTAT_TXABRT  0x02
+#define ENC_ESTAT_CLKRDY  0x01
+
+/*
+ * EIE Register Bits
+ */
+
+#define ENC_EIE_INTIE  0x80
+#define ENC_EIE_PKTIE  0x40
+#define ENC_EIE_DMAIE  0x20
+#define ENC_EIE_LINKIE 0x10
+#define ENC_EIE_TXIE   0x08
+#define ENC_EIE_WOLIE  0x04
+#define ENC_EIE_TXERIE 0x02
+#define ENC_EIE_RXERIE 0x01
+
+/*
+ * MACON1 Register Bits
+ */
+#define ENC_MACON1_LOOPBK  0x10
+#define ENC_MACON1_TXPAUS  0x08
+#define ENC_MACON1_RXPAUS  0x04
+#define ENC_MACON1_PASSALL 0x02
+#define ENC_MACON1_MARXEN  0x01
+
+
+/*
+ * MACON2 Register Bits
+ */
+#define ENC_MACON2_MARST   0x80
+#define ENC_MACON2_RNDRST  0x40
+#define ENC_MACON2_MARXRST 0x08
+#define ENC_MACON2_RFUNRST 0x04
+#define ENC_MACON2_MATXRST 0x02
+#define ENC_MACON2_TFUNRST 0x01
+
+/*
+ * MACON3 Register Bits
+ */
+#define ENC_MACON3_PADCFG2 0x80
+#define ENC_MACON3_PADCFG1 0x40
+#define ENC_MACON3_PADCFG0 0x20
+#define ENC_MACON3_TXCRCEN 0x10
+#define ENC_MACON3_PHDRLEN 0x08
+#define ENC_MACON3_HFRMEN  0x04
+#define ENC_MACON3_FRMLNEN 0x02
+#define ENC_MACON3_FULDPX  0x01
+
+/*
+ * MICMD Register Bits
+ */
+#define ENC_MICMD_MIISCAN 0x02
+#define ENC_MICMD_MIIRD   0x01
+
+/*
+ * MISTAT Register Bits
+ */
+#define ENC_MISTAT_NVALID 0x04
+#define ENC_MISTAT_SCAN   0x02
+#define ENC_MISTAT_BUSY   0x01
+
+/*
+ * PHID1 and PHID2 values
+ */
+#define ENC_PHID1_VALUE 0x0083
+#define ENC_PHID2_VALUE 0x1400
+#define ENC_PHID2_MASK	0xFC00
+
+
+#define ENC_SPI_SLAVE_CS 0x00010000	/* pin P1.16 */
+#define ENC_RESET	 0x00020000	/* pin P1.17 */
+
+#define FAILSAFE_VALUE 5000
+
+/*
+ * Controller memory layout:
+ *
+ * 0x0000 - 0x17ff  6k bytes receive buffer
+ * 0x1800 - 0x1fff  2k bytes transmit buffer
+ */
+/* Use the lower memory for receiver buffer. See errata pt. 5 */
+#define ENC_RX_BUF_START 0x0000
+#define ENC_TX_BUF_START 0x1800
+/* taken from the Linux driver */
+#define ENC_RX_BUF_END   0x17ff
+#define ENC_TX_BUF_END   0x1fff
+
+/* maximum frame length */
+#define ENC_MAX_FRM_LEN 1518
+
+#define enc_enable() PUT32(IO1CLR, ENC_SPI_SLAVE_CS)
+#define enc_disable() PUT32(IO1SET, ENC_SPI_SLAVE_CS)
+#define enc_cfg_spi() spi_set_cfg(0, 0, 0); spi_set_clock(8);
+
+
+static unsigned char encReadReg (unsigned char regNo);
+static void encWriteReg (unsigned char regNo, unsigned char data);
+static void encWriteRegRetry (unsigned char regNo, unsigned char data, int c);
+static void encReadBuff (unsigned short length, unsigned char *pBuff);
+static void encWriteBuff (unsigned short length, unsigned char *pBuff);
+static void encBitSet (unsigned char regNo, unsigned char data);
+static void encBitClr (unsigned char regNo, unsigned char data);
+static void encReset (void);
+static void encInit (unsigned char *pEthAddr);
+static unsigned short phyRead (unsigned char addr);
+static void phyWrite(unsigned char, unsigned short);
+static void encPoll (void);
+static void encRx (void);
+
+#define m_nic_read(reg) encReadReg(reg)
+#define m_nic_write(reg, data) encWriteReg(reg, data)
+#define m_nic_write_retry(reg, data, count) encWriteRegRetry(reg, data, count)
+#define m_nic_read_data(len, buf) encReadBuff((len), (buf))
+#define m_nic_write_data(len, buf) encWriteBuff((len), (buf))
+
+/* bit field set */
+#define m_nic_bfs(reg, data) encBitSet(reg, data)
+
+/* bit field clear */
+#define m_nic_bfc(reg, data) encBitClr(reg, data)
+
+static unsigned char bank = 0;	/* current bank in enc28j60 */
+static unsigned char next_pointer_lsb;
+static unsigned char next_pointer_msb;
+
+static unsigned char buffer[ENC_MAX_FRM_LEN];
+static int rxResetCounter = 0;
+
+#define RX_RESET_COUNTER 1000;
+
+/*-----------------------------------------------------------------------------
+ * Always returns 0
+ */
+int eth_init (bd_t * bis)
+{
+	unsigned char estatVal;
+
+	/* configure GPIO */
+	(*((volatile unsigned long *) IO1DIR)) |= ENC_SPI_SLAVE_CS;
+	(*((volatile unsigned long *) IO1DIR)) |= ENC_RESET;
+
+	/* CS and RESET active low */
+	PUT32 (IO1SET, ENC_SPI_SLAVE_CS);
+	PUT32 (IO1SET, ENC_RESET);
+
+	spi_init ();
+
+	/* taken from the Linux driver - dangerous stuff here! */
+	/* Wait for CLKRDY to become set (i.e., check that we can communicate with
+	   the ENC) */
+	do
+	{
+		estatVal = m_nic_read(CTL_REG_ESTAT);
+	} while ((estatVal & 0x08) || (~estatVal & ENC_ESTAT_CLKRDY));
+
+	/* initialize controller */
+	encReset ();
+	encInit (bis->bi_enetaddr);
+
+	m_nic_bfs (CTL_REG_ECON1, ENC_ECON1_RXEN);	/* enable receive */
+
+	return 0;
+}
+
+int eth_send (volatile void *packet, int length)
+{
+	/* check frame length, etc. */
+	/* TODO: */
+
+	/* switch to bank 0 */
+	m_nic_bfc (CTL_REG_ECON1, (ENC_ECON1_BSEL1 | ENC_ECON1_BSEL0));
+
+	/* set EWRPT */
+	m_nic_write (CTL_REG_EWRPTL, (ENC_TX_BUF_START & 0xff));
+	m_nic_write (CTL_REG_EWRPTH, (ENC_TX_BUF_START >> 8));
+
+	/* set ETXND */
+	m_nic_write (CTL_REG_ETXNDL, (length + ENC_TX_BUF_START) & 0xFF);
+	m_nic_write (CTL_REG_ETXNDH, (length + ENC_TX_BUF_START) >> 8);
+
+	/* set ETXST */
+	m_nic_write (CTL_REG_ETXSTL, ENC_TX_BUF_START & 0xFF);
+	m_nic_write (CTL_REG_ETXSTH, ENC_TX_BUF_START >> 8);
+
+	/* write packet */
+	m_nic_write_data (length, (unsigned char *) packet);
+
+	/* taken from the Linux driver */
+	/* Verify that the internal transmit logic has not been altered by excessive
+	   collisions.  See Errata B4 12 and 14.
+	 */
+	if (m_nic_read(CTL_REG_EIR) & ENC_EIR_TXERIF) {
+		m_nic_bfs(CTL_REG_ECON1, ENC_ECON1_TXRST);
+		m_nic_bfc(CTL_REG_ECON1, ENC_ECON1_TXRST);
+	}
+	m_nic_bfc(CTL_REG_EIR, (ENC_EIR_TXERIF | ENC_EIR_TXIF));
+
+	/* set ECON1.TXRTS */
+	m_nic_bfs (CTL_REG_ECON1, ENC_ECON1_TXRTS);
+
+	return 0;
+}
+
+
+/*****************************************************************************
+ * This function resets the receiver only. This function may be called from
+ * interrupt-context.
+ */
+static void encReceiverReset (void)
+{
+	unsigned char econ1;
+
+	econ1 = m_nic_read (CTL_REG_ECON1);
+	if ((econ1 & ENC_ECON1_RXRST) == 0) {
+		m_nic_bfs (CTL_REG_ECON1, ENC_ECON1_RXRST);
+		rxResetCounter = RX_RESET_COUNTER;
+	}
+}
+
+/*****************************************************************************
+ * receiver reset timer
+ */
+static void encReceiverResetCallback (void)
+{
+	m_nic_bfc (CTL_REG_ECON1, ENC_ECON1_RXRST);
+	m_nic_bfs (CTL_REG_ECON1, ENC_ECON1_RXEN);	/* enable receive */
+}
+
+/*-----------------------------------------------------------------------------
+ * Check for received packets. Call NetReceive for each packet. The return
+ * value is ignored by the caller.
+ */
+int eth_rx (void)
+{
+	if (rxResetCounter > 0 && --rxResetCounter == 0) {
+		encReceiverResetCallback ();
+	}
+
+	encPoll ();
+
+	return 0;
+}
+
+void eth_halt (void)
+{
+	m_nic_bfc (CTL_REG_ECON1, ENC_ECON1_RXEN);	/* disable receive */
+}
+
+/*****************************************************************************/
+
+static void encPoll (void)
+{
+	unsigned char eir_reg;
+	volatile unsigned char estat_reg;
+	unsigned char pkt_cnt;
+
+#ifdef CONFIG_USE_IRQ
+	/* clear global interrupt enable bit in enc28j60 */
+	m_nic_bfc (CTL_REG_EIE, ENC_EIE_INTIE);
+#endif
+	estat_reg = m_nic_read (CTL_REG_ESTAT);
+
+	eir_reg = m_nic_read (CTL_REG_EIR);
+
+	if (eir_reg & ENC_EIR_TXIF) {
+		/* clear TXIF bit in EIR */
+		m_nic_bfc (CTL_REG_EIR, ENC_EIR_TXIF);
+	}
+
+	/* We have to use pktcnt and not pktif bit, see errata pt. 6 */
+
+	/* move to bank 1 */
+	m_nic_bfc (CTL_REG_ECON1, ENC_ECON1_BSEL1);
+	m_nic_bfs (CTL_REG_ECON1, ENC_ECON1_BSEL0);
+
+	/* read pktcnt */
+	pkt_cnt = m_nic_read (CTL_REG_EPKTCNT);
+
+	if (pkt_cnt > 0) {
+		if ((eir_reg & ENC_EIR_PKTIF) == 0) {
+			/*printf("encPoll: pkt cnt > 0, but pktif not set\n"); */
+		}
+		encRx ();
+		/* clear PKTIF bit in EIR, this should not need to be done but it
+		   seems like we get problems if we do not */
+		m_nic_bfc (CTL_REG_EIR, ENC_EIR_PKTIF);
+	}
+
+	if (eir_reg & ENC_EIR_RXERIF) {
+		printf ("encPoll: rx error\n");
+		m_nic_bfc (CTL_REG_EIR, ENC_EIR_RXERIF);
+	}
+	if (eir_reg & ENC_EIR_TXERIF) {
+		printf ("encPoll: tx error\n");
+		m_nic_bfc (CTL_REG_EIR, ENC_EIR_TXERIF);
+	}
+
+#ifdef CONFIG_USE_IRQ
+	/* set global interrupt enable bit in enc28j60 */
+	m_nic_bfs (CTL_REG_EIE, ENC_EIE_INTIE);
+#endif
+}
+
+static void encRx (void)
+{
+	unsigned short pkt_len;
+	unsigned short copy_len;
+	unsigned short status;
+	unsigned char eir_reg;
+	unsigned char pkt_cnt = 0;
+	unsigned short rxbuf_rdpt;
+
+	/* switch to bank 0 */
+	m_nic_bfc (CTL_REG_ECON1, (ENC_ECON1_BSEL1 | ENC_ECON1_BSEL0));
+
+	m_nic_write (CTL_REG_ERDPTL, next_pointer_lsb);
+	m_nic_write (CTL_REG_ERDPTH, next_pointer_msb);
+
+	do {
+		m_nic_read_data (6, buffer);
+		next_pointer_lsb = buffer[0];
+		next_pointer_msb = buffer[1];
+		pkt_len = buffer[2];
+		pkt_len |= (unsigned short) buffer[3] << 8;
+		status = buffer[4];
+		status |= (unsigned short) buffer[5] << 8;
+
+		if (pkt_len <= ENC_MAX_FRM_LEN)
+			copy_len = pkt_len;
+		else
+			copy_len = 0;
+
+		if ((status & (1L << 7)) == 0) /* check Received Ok bit */
+			copy_len = 0;
+
+		/* taken from the Linux driver */
+		/* check if next pointer is resonable */
+		if ((((unsigned int)next_pointer_msb << 8) |
+			(unsigned int)next_pointer_lsb) >= ENC_TX_BUF_START)
+			copy_len = 0;
+
+		if (copy_len > 0) {
+			m_nic_read_data (copy_len, buffer);
+		}
+
+		/* advance read pointer to next pointer */
+		m_nic_write (CTL_REG_ERDPTL, next_pointer_lsb);
+		m_nic_write (CTL_REG_ERDPTH, next_pointer_msb);
+
+		/* decrease packet counter */
+		m_nic_bfs (CTL_REG_ECON2, ENC_ECON2_PKTDEC);
+
+		/* taken from the Linux driver */
+		/* Only odd values should be written to ERXRDPTL, 
+		 * see errata B4 pt.13 
+		 */
+		rxbuf_rdpt = (next_pointer_msb << 8 | next_pointer_lsb) - 1;
+		if ((rxbuf_rdpt < (m_nic_read(CTL_REG_ERXSTH) << 8 |
+				m_nic_read(CTL_REG_ERXSTL))) || (rxbuf_rdpt >
+				(m_nic_read(CTL_REG_ERXNDH) << 8 |
+				m_nic_read(CTL_REG_ERXNDL)))) {
+			m_nic_write(CTL_REG_ERXRDPTL, m_nic_read(CTL_REG_ERXNDL));
+			m_nic_write(CTL_REG_ERXRDPTH, m_nic_read(CTL_REG_ERXNDH));
+		} else {
+			m_nic_write(CTL_REG_ERXRDPTL, rxbuf_rdpt & 0xFF);
+			m_nic_write(CTL_REG_ERXRDPTH, rxbuf_rdpt >> 8);
+		}
+
+		/* move to bank 1 */
+		m_nic_bfc (CTL_REG_ECON1, ENC_ECON1_BSEL1);
+		m_nic_bfs (CTL_REG_ECON1, ENC_ECON1_BSEL0);
+
+		/* read pktcnt */
+		pkt_cnt = m_nic_read (CTL_REG_EPKTCNT);
+
+		/* switch to bank 0 */
+		m_nic_bfc (CTL_REG_ECON1,
+			   (ENC_ECON1_BSEL1 | ENC_ECON1_BSEL0));
+
+		if (copy_len == 0) {
+			eir_reg = m_nic_read (CTL_REG_EIR);
+			encReceiverReset ();
+			printf ("eth_rx: copy_len=0\n");
+			continue;
+		}
+
+		NetReceive ((unsigned char *) buffer, pkt_len);
+
+		eir_reg = m_nic_read (CTL_REG_EIR);
+	} while (pkt_cnt);	/* Use EPKTCNT not EIR.PKTIF flag, see errata pt. 6 */
+}
+
+static void encWriteReg (unsigned char regNo, unsigned char data)
+{
+	spi_lock ();
+	enc_cfg_spi ();
+	enc_enable ();
+
+	spi_write (0x40 | regNo);	/* write in regNo */
+	spi_write (data);
+
+	enc_disable ();
+	enc_enable ();
+
+	spi_write (0x1f);	/* write reg 0x1f */
+
+	enc_disable ();
+	spi_unlock ();
+}
+
+static void encWriteRegRetry (unsigned char regNo, unsigned char data, int c)
+{
+	unsigned char readback;
+	int i;
+
+	spi_lock ();
+
+	for (i = 0; i < c; i++) {
+		enc_cfg_spi ();
+		enc_enable ();
+
+		spi_write (0x40 | regNo);	/* write in regNo */
+		spi_write (data);
+
+		enc_disable ();
+		enc_enable ();
+
+		spi_write (0x1f);	/* write reg 0x1f */
+
+		enc_disable ();
+
+		spi_unlock ();	/* we must unlock spi first */
+
+		readback = encReadReg (regNo);
+
+		spi_lock ();
+
+		if (readback == data)
+			break;
+	}
+	spi_unlock ();
+
+	if (i == c) {
+		printf ("enc28j60: write reg %d failed\n", regNo);
+	}
+}
+
+static unsigned char encReadReg (unsigned char regNo)
+{
+	unsigned char rxByte;
+
+	spi_lock ();
+	enc_cfg_spi ();
+	enc_enable ();
+
+	spi_write (0x1f);	/* read reg 0x1f */
+
+	bank = spi_read () & 0x3;
+
+	enc_disable ();
+	enc_enable ();
+
+	spi_write (regNo);
+	rxByte = spi_read ();
+
+	/* check if MAC or MII register */
+	if (((bank == 2) && (regNo <= 0x1a)) ||
+	    ((bank == 3) && (regNo <= 0x05 || regNo == 0x0a))) {
+		/* ignore first byte and read another byte */
+		rxByte = spi_read ();
+	}
+
+	enc_disable ();
+	spi_unlock ();
+
+	return rxByte;
+}
+
+static void encReadBuff (unsigned short length, unsigned char *pBuff)
+{
+	spi_lock ();
+	enc_cfg_spi ();
+	enc_enable ();
+
+	spi_write (0x20 | 0x1a);	/* read buffer memory */
+
+	while (length--) {
+		if (pBuff != NULL)
+			*pBuff++ = spi_read ();
+		else
+			spi_write (0);
+	}
+
+	enc_disable ();
+	spi_unlock ();
+}
+
+static void encWriteBuff (unsigned short length, unsigned char *pBuff)
+{
+	spi_lock ();
+	enc_cfg_spi ();
+	enc_enable ();
+
+	spi_write (0x60 | 0x1a);	/* write buffer memory */
+
+	spi_write (0x00);	/* control byte */
+
+	while (length--)
+		spi_write (*pBuff++);
+
+	enc_disable ();
+	spi_unlock ();
+}
+
+static void encBitSet (unsigned char regNo, unsigned char data)
+{
+	spi_lock ();
+	enc_cfg_spi ();
+	enc_enable ();
+
+	spi_write (0x80 | regNo);	/* bit field set */
+	spi_write (data);
+
+	enc_disable ();
+	spi_unlock ();
+}
+
+static void encBitClr (unsigned char regNo, unsigned char data)
+{
+	spi_lock ();
+	enc_cfg_spi ();
+	enc_enable ();
+
+	spi_write (0xA0 | regNo);	/* bit field clear */
+	spi_write (data);
+
+	enc_disable ();
+	spi_unlock ();
+}
+
+static void encReset (void)
+{
+	spi_lock ();
+	enc_cfg_spi ();
+	enc_enable ();
+
+	spi_write (0xff);	/* soft reset */
+
+	enc_disable ();
+	spi_unlock ();
+
+	/* sleep 1 ms. See errata pt. 2 */
+	udelay (1000);
+}
+
+static void encInit (unsigned char *pEthAddr)
+{
+	unsigned short phid1 = 0;
+	unsigned short phid2 = 0;
+
+	/* switch to bank 0 */
+	m_nic_bfc (CTL_REG_ECON1, (ENC_ECON1_BSEL1 | ENC_ECON1_BSEL0));
+
+	/*
+	 * Setup the buffer space. The reset values are valid for the
+	 * other pointers.
+	 */
+	/* We shall not write to ERXST, see errata pt. 5. Instead we
+	   have to make sure that ENC_RX_BUS_START is 0. */
+	m_nic_write_retry (CTL_REG_ERXSTL, (ENC_RX_BUF_START & 0xFF), 1);
+	m_nic_write_retry (CTL_REG_ERXSTH, (ENC_RX_BUF_START >> 8), 1);
+
+	/* taken from the Linux driver */
+	m_nic_write_retry (CTL_REG_ERXNDL, (ENC_RX_BUF_END & 0xFF), 1);
+	m_nic_write_retry (CTL_REG_ERXNDH, (ENC_RX_BUF_END >> 8), 1);
+
+	m_nic_write_retry (CTL_REG_ERDPTL, (ENC_RX_BUF_START & 0xFF), 1);
+	m_nic_write_retry (CTL_REG_ERDPTH, (ENC_RX_BUF_START >> 8), 1);
+
+	next_pointer_lsb = (ENC_RX_BUF_START & 0xFF);
+	next_pointer_msb = (ENC_RX_BUF_START >> 8);
+
+	/* verify identification */
+	phid1 = phyRead (PHY_REG_PHID1);
+	phid2 = phyRead (PHY_REG_PHID2);
+
+	if (phid1 != ENC_PHID1_VALUE
+	    || (phid2 & ENC_PHID2_MASK) != ENC_PHID2_VALUE) {
+		printf ("ERROR: failed to identify controller\n");
+		printf ("phid1 = %x, phid2 = %x\n",
+			phid1, (phid2 & ENC_PHID2_MASK));
+		printf ("should be phid1 = %x, phid2 = %x\n",
+			ENC_PHID1_VALUE, ENC_PHID2_VALUE);
+	}
+
+	/*
+	 * --- MAC Initialization ---
+	 */
+
+	/* Pull MAC out of Reset */
+
+	/* switch to bank 2 */
+	m_nic_bfc (CTL_REG_ECON1, ENC_ECON1_BSEL0);
+	m_nic_bfs (CTL_REG_ECON1, ENC_ECON1_BSEL1);
+
+	/* enable MAC to receive frames */
+	/* added some bits from the Linux driver */
+	m_nic_write_retry (CTL_REG_MACON1
+		,(ENC_MACON1_MARXEN | ENC_MACON1_TXPAUS | ENC_MACON1_RXPAUS)
+		,10);
+
+	/* configure pad, tx-crc and duplex */
+	/* added a bit from the Linux driver */
+	m_nic_write_retry (CTL_REG_MACON3
+		,(ENC_MACON3_PADCFG0 | ENC_MACON3_TXCRCEN | ENC_MACON3_FRMLNEN)
+		,10);
+
+	/* added 4 new lines from the Linux driver */
+	/* Allow infinite deferals if the medium is continously busy */
+	m_nic_write_retry(CTL_REG_MACON4, (1<<6) /*ENC_MACON4_DEFER*/, 10);
+
+	/* Late collisions occur beyond 63 bytes */
+	m_nic_write_retry(CTL_REG_MACLCON2, 63, 10);
+
+	/* Set (low byte) Non-Back-to_Back Inter-Packet Gap. Recommended 0x12 */
+	m_nic_write_retry(CTL_REG_MAIPGL, 0x12, 10);
+
+	/*
+	* Set (high byte) Non-Back-to_Back Inter-Packet Gap. Recommended
+	* 0x0c for half-duplex. Nothing for full-duplex
+	*/
+	m_nic_write_retry(CTL_REG_MAIPGH, 0x0C, 10);
+
+	/* set maximum frame length */
+	m_nic_write_retry (CTL_REG_MAMXFLL, (ENC_MAX_FRM_LEN & 0xff), 10);
+	m_nic_write_retry (CTL_REG_MAMXFLH, (ENC_MAX_FRM_LEN >> 8), 10);
+
+	/*
+	 * Set MAC back-to-back inter-packet gap. Recommended 0x12 for half duplex
+	 * and 0x15 for full duplex.
+	 */
+	m_nic_write_retry (CTL_REG_MABBIPG, 0x12, 10);
+
+	/* set MAC address */
+
+	/* switch to bank 3 */
+	m_nic_bfs (CTL_REG_ECON1, (ENC_ECON1_BSEL0 | ENC_ECON1_BSEL1));
+
+	m_nic_write_retry (CTL_REG_MAADR0, pEthAddr[5], 1);
+	m_nic_write_retry (CTL_REG_MAADR1, pEthAddr[4], 1);
+	m_nic_write_retry (CTL_REG_MAADR2, pEthAddr[3], 1);
+	m_nic_write_retry (CTL_REG_MAADR3, pEthAddr[2], 1);
+	m_nic_write_retry (CTL_REG_MAADR4, pEthAddr[1], 1);
+	m_nic_write_retry (CTL_REG_MAADR5, pEthAddr[0], 1);
+
+	/*
+	* PHY Initialization taken from the Linux driver
+	 */
+
+	/* Prevent automatic loopback of data beeing transmitted by setting
+	   ENC_PHCON2_HDLDIS */
+	phyWrite(PHY_REG_PHCON2, (1<<8));
+
+	/* LEDs configuration
+	 * LEDA: LACFG = 0100 -> display link status
+	 * LEDB: LBCFG = 0111 -> display TX & RX activity
+	 * STRCH = 1 -> LED pulses
+	 */
+	phyWrite(PHY_REG_PHLCON, 0x0472);
+
+	/* Reset PDPXMD-bit => half duplex */
+	phyWrite(PHY_REG_PHCON1, 0);
+
+	/*
+	 * Receive settings
+	 */
+
+#ifdef CONFIG_USE_IRQ
+	/* enable interrupts */
+	m_nic_bfs (CTL_REG_EIE, ENC_EIE_PKTIE);
+	m_nic_bfs (CTL_REG_EIE, ENC_EIE_TXIE);
+	m_nic_bfs (CTL_REG_EIE, ENC_EIE_RXERIE);
+	m_nic_bfs (CTL_REG_EIE, ENC_EIE_TXERIE);
+	m_nic_bfs (CTL_REG_EIE, ENC_EIE_INTIE);
+#endif
+}
+
+/*****************************************************************************
+ *
+ * Description:
+ *    Read PHY registers.
+ *
+ *    NOTE! This function will change to Bank 2.
+ *
+ * Params:
+ *    [in] addr address of the register to read
+ *
+ * Returns:
+ *    The value in the register
+ */
+static unsigned short phyRead (unsigned char addr)
+{
+	unsigned short ret = 0;
+
+	/* move to bank 2 */
+	m_nic_bfc (CTL_REG_ECON1, ENC_ECON1_BSEL0);
+	m_nic_bfs (CTL_REG_ECON1, ENC_ECON1_BSEL1);
+
+	/* write address to MIREGADR */
+	m_nic_write (CTL_REG_MIREGADR, addr);
+
+	/* set MICMD.MIIRD */
+	m_nic_write (CTL_REG_MICMD, ENC_MICMD_MIIRD);
+
+	/* taken from the Linux driver */
+	/* move to bank 3 */
+	m_nic_bfs(CTL_REG_ECON1, ENC_ECON1_BSEL0);
+	m_nic_bfs(CTL_REG_ECON1, ENC_ECON1_BSEL1);
+
+	/* poll MISTAT.BUSY bit until operation is complete */
+	while ((m_nic_read (CTL_REG_MISTAT) & ENC_MISTAT_BUSY) != 0) {
+		static int cnt = 0;
+
+		if (cnt++ >= 1000) {
+			/* GJ - this seems extremely dangerous! */
+			/* printf("#"); */
+			cnt = 0;
+		}
+	}
+
+	/* taken from the Linux driver */
+	/* move to bank 2 */
+	m_nic_bfc(CTL_REG_ECON1, ENC_ECON1_BSEL0);
+	m_nic_bfs(CTL_REG_ECON1, ENC_ECON1_BSEL1);
+
+	/* clear MICMD.MIIRD */
+	m_nic_write (CTL_REG_MICMD, 0);
+
+	ret = (m_nic_read (CTL_REG_MIRDH) << 8);
+	ret |= (m_nic_read (CTL_REG_MIRDL) & 0xFF);
+
+	return ret;
+}
+
+/*****************************************************************************
+ *
+ * Taken from the Linux driver.
+ * Description:
+ * Write PHY registers.
+ *
+ * NOTE! This function will change to Bank 3.
+ *
+ * Params:
+ * [in] addr address of the register to write to
+ * [in] data to be written
+ *
+ * Returns:
+ *    None
+ */
+static void phyWrite(unsigned char addr, unsigned short data)
+{
+	/* move to bank 2 */
+	m_nic_bfc(CTL_REG_ECON1, ENC_ECON1_BSEL0);
+	m_nic_bfs(CTL_REG_ECON1, ENC_ECON1_BSEL1);
+
+	/* write address to MIREGADR */
+	m_nic_write(CTL_REG_MIREGADR, addr);
+
+	m_nic_write(CTL_REG_MIWRL, data & 0xff);
+	m_nic_write(CTL_REG_MIWRH, data >> 8);
+
+	/* move to bank 3 */
+	m_nic_bfs(CTL_REG_ECON1, ENC_ECON1_BSEL0);
+	m_nic_bfs(CTL_REG_ECON1, ENC_ECON1_BSEL1);
+
+	/* poll MISTAT.BUSY bit until operation is complete */
+	while((m_nic_read(CTL_REG_MISTAT) & ENC_MISTAT_BUSY) != 0) {
+		static int cnt = 0;
+
+		if(cnt++ >= 1000) {
+			cnt = 0;
+		}
+	}
+}
+
+#endif /* CONFIG_ENC28J60 */