net: add opencore 10/100 ethernet mac driver

This patch ports the opencore 10/100 ethernet mac driver ethoc.c
from linux kernel to u-boot.

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Signed-off-by: Ben Warren <biggerbadderben@gmail.com>

1 files changed, 511 insertions, 0 deletions

diff --git a/drivers/net/ethoc.c b/drivers/net/ethoc.c
new file mode 100644
index 0000000..b912e44
--- /dev/null
+++ b/drivers/net/ethoc.c
@@ -0,0 +1,511 @@
+/*
+ * Opencore 10/100 ethernet mac driver
+ *
+ * Copyright (C) 2007-2008 Avionic Design Development GmbH
+ * Copyright (C) 2008-2009 Avionic Design GmbH
+ *   Thierry Reding <thierry.reding@avionic-design.de>
+ * Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <common.h>
+#include <command.h>
+#include <malloc.h>
+#include <net.h>
+#include <miiphy.h>
+#include <asm/io.h>
+#include <asm/cache.h>
+
+/* register offsets */
+#define	MODER		0x00
+#define	INT_SOURCE	0x04
+#define	INT_MASK	0x08
+#define	IPGT		0x0c
+#define	IPGR1		0x10
+#define	IPGR2		0x14
+#define	PACKETLEN	0x18
+#define	COLLCONF	0x1c
+#define	TX_BD_NUM	0x20
+#define	CTRLMODER	0x24
+#define	MIIMODER	0x28
+#define	MIICOMMAND	0x2c
+#define	MIIADDRESS	0x30
+#define	MIITX_DATA	0x34
+#define	MIIRX_DATA	0x38
+#define	MIISTATUS	0x3c
+#define	MAC_ADDR0	0x40
+#define	MAC_ADDR1	0x44
+#define	ETH_HASH0	0x48
+#define	ETH_HASH1	0x4c
+#define	ETH_TXCTRL	0x50
+
+/* mode register */
+#define	MODER_RXEN	(1 <<  0)	/* receive enable */
+#define	MODER_TXEN	(1 <<  1)	/* transmit enable */
+#define	MODER_NOPRE	(1 <<  2)	/* no preamble */
+#define	MODER_BRO	(1 <<  3)	/* broadcast address */
+#define	MODER_IAM	(1 <<  4)	/* individual address mode */
+#define	MODER_PRO	(1 <<  5)	/* promiscuous mode */
+#define	MODER_IFG	(1 <<  6)	/* interframe gap for incoming frames */
+#define	MODER_LOOP	(1 <<  7)	/* loopback */
+#define	MODER_NBO	(1 <<  8)	/* no back-off */
+#define	MODER_EDE	(1 <<  9)	/* excess defer enable */
+#define	MODER_FULLD	(1 << 10)	/* full duplex */
+#define	MODER_RESET	(1 << 11)	/* FIXME: reset (undocumented) */
+#define	MODER_DCRC	(1 << 12)	/* delayed CRC enable */
+#define	MODER_CRC	(1 << 13)	/* CRC enable */
+#define	MODER_HUGE	(1 << 14)	/* huge packets enable */
+#define	MODER_PAD	(1 << 15)	/* padding enabled */
+#define	MODER_RSM	(1 << 16)	/* receive small packets */
+
+/* interrupt source and mask registers */
+#define	INT_MASK_TXF	(1 << 0)	/* transmit frame */
+#define	INT_MASK_TXE	(1 << 1)	/* transmit error */
+#define	INT_MASK_RXF	(1 << 2)	/* receive frame */
+#define	INT_MASK_RXE	(1 << 3)	/* receive error */
+#define	INT_MASK_BUSY	(1 << 4)
+#define	INT_MASK_TXC	(1 << 5)	/* transmit control frame */
+#define	INT_MASK_RXC	(1 << 6)	/* receive control frame */
+
+#define	INT_MASK_TX	(INT_MASK_TXF | INT_MASK_TXE)
+#define	INT_MASK_RX	(INT_MASK_RXF | INT_MASK_RXE)
+
+#define	INT_MASK_ALL ( \
+		INT_MASK_TXF | INT_MASK_TXE | \
+		INT_MASK_RXF | INT_MASK_RXE | \
+		INT_MASK_TXC | INT_MASK_RXC | \
+		INT_MASK_BUSY \
+	)
+
+/* packet length register */
+#define	PACKETLEN_MIN(min)		(((min) & 0xffff) << 16)
+#define	PACKETLEN_MAX(max)		(((max) & 0xffff) <<  0)
+#define	PACKETLEN_MIN_MAX(min, max)	(PACKETLEN_MIN(min) | \
+					PACKETLEN_MAX(max))
+
+/* transmit buffer number register */
+#define	TX_BD_NUM_VAL(x)	(((x) <= 0x80) ? (x) : 0x80)
+
+/* control module mode register */
+#define	CTRLMODER_PASSALL	(1 << 0)	/* pass all receive frames */
+#define	CTRLMODER_RXFLOW	(1 << 1)	/* receive control flow */
+#define	CTRLMODER_TXFLOW	(1 << 2)	/* transmit control flow */
+
+/* MII mode register */
+#define	MIIMODER_CLKDIV(x)	((x) & 0xfe)	/* needs to be an even number */
+#define	MIIMODER_NOPRE		(1 << 8)	/* no preamble */
+
+/* MII command register */
+#define	MIICOMMAND_SCAN		(1 << 0)	/* scan status */
+#define	MIICOMMAND_READ		(1 << 1)	/* read status */
+#define	MIICOMMAND_WRITE	(1 << 2)	/* write control data */
+
+/* MII address register */
+#define	MIIADDRESS_FIAD(x)		(((x) & 0x1f) << 0)
+#define	MIIADDRESS_RGAD(x)		(((x) & 0x1f) << 8)
+#define	MIIADDRESS_ADDR(phy, reg)	(MIIADDRESS_FIAD(phy) | \
+					MIIADDRESS_RGAD(reg))
+
+/* MII transmit data register */
+#define	MIITX_DATA_VAL(x)	((x) & 0xffff)
+
+/* MII receive data register */
+#define	MIIRX_DATA_VAL(x)	((x) & 0xffff)
+
+/* MII status register */
+#define	MIISTATUS_LINKFAIL	(1 << 0)
+#define	MIISTATUS_BUSY		(1 << 1)
+#define	MIISTATUS_INVALID	(1 << 2)
+
+/* TX buffer descriptor */
+#define	TX_BD_CS		(1 <<  0)	/* carrier sense lost */
+#define	TX_BD_DF		(1 <<  1)	/* defer indication */
+#define	TX_BD_LC		(1 <<  2)	/* late collision */
+#define	TX_BD_RL		(1 <<  3)	/* retransmission limit */
+#define	TX_BD_RETRY_MASK	(0x00f0)
+#define	TX_BD_RETRY(x)		(((x) & 0x00f0) >>  4)
+#define	TX_BD_UR		(1 <<  8)	/* transmitter underrun */
+#define	TX_BD_CRC		(1 << 11)	/* TX CRC enable */
+#define	TX_BD_PAD		(1 << 12)	/* pad enable */
+#define	TX_BD_WRAP		(1 << 13)
+#define	TX_BD_IRQ		(1 << 14)	/* interrupt request enable */
+#define	TX_BD_READY		(1 << 15)	/* TX buffer ready */
+#define	TX_BD_LEN(x)		(((x) & 0xffff) << 16)
+#define	TX_BD_LEN_MASK		(0xffff << 16)
+
+#define	TX_BD_STATS		(TX_BD_CS | TX_BD_DF | TX_BD_LC | \
+				TX_BD_RL | TX_BD_RETRY_MASK | TX_BD_UR)
+
+/* RX buffer descriptor */
+#define	RX_BD_LC	(1 <<  0)	/* late collision */
+#define	RX_BD_CRC	(1 <<  1)	/* RX CRC error */
+#define	RX_BD_SF	(1 <<  2)	/* short frame */
+#define	RX_BD_TL	(1 <<  3)	/* too long */
+#define	RX_BD_DN	(1 <<  4)	/* dribble nibble */
+#define	RX_BD_IS	(1 <<  5)	/* invalid symbol */
+#define	RX_BD_OR	(1 <<  6)	/* receiver overrun */
+#define	RX_BD_MISS	(1 <<  7)
+#define	RX_BD_CF	(1 <<  8)	/* control frame */
+#define	RX_BD_WRAP	(1 << 13)
+#define	RX_BD_IRQ	(1 << 14)	/* interrupt request enable */
+#define	RX_BD_EMPTY	(1 << 15)
+#define	RX_BD_LEN(x)	(((x) & 0xffff) << 16)
+
+#define	RX_BD_STATS	(RX_BD_LC | RX_BD_CRC | RX_BD_SF | RX_BD_TL | \
+			RX_BD_DN | RX_BD_IS | RX_BD_OR | RX_BD_MISS)
+
+#define	ETHOC_BUFSIZ		1536
+#define	ETHOC_ZLEN		64
+#define	ETHOC_BD_BASE		0x400
+#define	ETHOC_TIMEOUT		(HZ / 2)
+#define	ETHOC_MII_TIMEOUT	(1 + (HZ / 5))
+
+/**
+ * struct ethoc - driver-private device structure
+ * @num_tx:	number of send buffers
+ * @cur_tx:	last send buffer written
+ * @dty_tx:	last buffer actually sent
+ * @num_rx:	number of receive buffers
+ * @cur_rx:	current receive buffer
+ */
+struct ethoc {
+	u32 num_tx;
+	u32 cur_tx;
+	u32 dty_tx;
+	u32 num_rx;
+	u32 cur_rx;
+};
+
+/**
+ * struct ethoc_bd - buffer descriptor
+ * @stat:	buffer statistics
+ * @addr:	physical memory address
+ */
+struct ethoc_bd {
+	u32 stat;
+	u32 addr;
+};
+
+static inline u32 ethoc_read(struct eth_device *dev, loff_t offset)
+{
+	return readl(dev->iobase + offset);
+}
+
+static inline void ethoc_write(struct eth_device *dev, loff_t offset, u32 data)
+{
+	writel(data, dev->iobase + offset);
+}
+
+static inline void ethoc_read_bd(struct eth_device *dev, int index,
+				 struct ethoc_bd *bd)
+{
+	loff_t offset = ETHOC_BD_BASE + (index * sizeof(struct ethoc_bd));
+	bd->stat = ethoc_read(dev, offset + 0);
+	bd->addr = ethoc_read(dev, offset + 4);
+}
+
+static inline void ethoc_write_bd(struct eth_device *dev, int index,
+				  const struct ethoc_bd *bd)
+{
+	loff_t offset = ETHOC_BD_BASE + (index * sizeof(struct ethoc_bd));
+	ethoc_write(dev, offset + 0, bd->stat);
+	ethoc_write(dev, offset + 4, bd->addr);
+}
+
+static inline void ethoc_set_mac_address(struct eth_device *dev)
+{
+	u8 *mac = dev->enetaddr;
+
+	ethoc_write(dev, MAC_ADDR0, (mac[2] << 24) | (mac[3] << 16) |
+		    (mac[4] << 8) | (mac[5] << 0));
+	ethoc_write(dev, MAC_ADDR1, (mac[0] << 8) | (mac[1] << 0));
+}
+
+static inline void ethoc_ack_irq(struct eth_device *dev, u32 mask)
+{
+	ethoc_write(dev, INT_SOURCE, mask);
+}
+
+static inline void ethoc_enable_rx_and_tx(struct eth_device *dev)
+{
+	u32 mode = ethoc_read(dev, MODER);
+	mode |= MODER_RXEN | MODER_TXEN;
+	ethoc_write(dev, MODER, mode);
+}
+
+static inline void ethoc_disable_rx_and_tx(struct eth_device *dev)
+{
+	u32 mode = ethoc_read(dev, MODER);
+	mode &= ~(MODER_RXEN | MODER_TXEN);
+	ethoc_write(dev, MODER, mode);
+}
+
+static int ethoc_init_ring(struct eth_device *dev)
+{
+	struct ethoc *priv = (struct ethoc *)dev->priv;
+	struct ethoc_bd bd;
+	int i;
+
+	priv->cur_tx = 0;
+	priv->dty_tx = 0;
+	priv->cur_rx = 0;
+
+	/* setup transmission buffers */
+	bd.stat = TX_BD_IRQ | TX_BD_CRC;
+
+	for (i = 0; i < priv->num_tx; i++) {
+		if (i == priv->num_tx - 1)
+			bd.stat |= TX_BD_WRAP;
+
+		ethoc_write_bd(dev, i, &bd);
+	}
+
+	bd.stat = RX_BD_EMPTY | RX_BD_IRQ;
+
+	for (i = 0; i < priv->num_rx; i++) {
+		bd.addr = (u32)NetRxPackets[i];
+		if (i == priv->num_rx - 1)
+			bd.stat |= RX_BD_WRAP;
+
+		flush_dcache(bd.addr, PKTSIZE_ALIGN);
+		ethoc_write_bd(dev, priv->num_tx + i, &bd);
+	}
+
+	return 0;
+}
+
+static int ethoc_reset(struct eth_device *dev)
+{
+	u32 mode;
+
+	/* TODO: reset controller? */
+
+	ethoc_disable_rx_and_tx(dev);
+
+	/* TODO: setup registers */
+
+	/* enable FCS generation and automatic padding */
+	mode = ethoc_read(dev, MODER);
+	mode |= MODER_CRC | MODER_PAD;
+	ethoc_write(dev, MODER, mode);
+
+	/* set full-duplex mode */
+	mode = ethoc_read(dev, MODER);
+	mode |= MODER_FULLD;
+	ethoc_write(dev, MODER, mode);
+	ethoc_write(dev, IPGT, 0x15);
+
+	ethoc_ack_irq(dev, INT_MASK_ALL);
+	ethoc_enable_rx_and_tx(dev);
+	return 0;
+}
+
+static int ethoc_init(struct eth_device *dev, bd_t * bd)
+{
+	struct ethoc *priv = (struct ethoc *)dev->priv;
+	printf("ethoc\n");
+
+	ethoc_set_mac_address(dev);
+
+	priv->num_tx = 1;
+	priv->num_rx = PKTBUFSRX;
+	ethoc_write(dev, TX_BD_NUM, priv->num_tx);
+	ethoc_init_ring(dev);
+	ethoc_reset(dev);
+
+	return 0;
+}
+
+static int ethoc_update_rx_stats(struct ethoc_bd *bd)
+{
+	int ret = 0;
+
+	if (bd->stat & RX_BD_TL) {
+		debug("ETHOC: " "RX: frame too long\n");
+		ret++;
+	}
+
+	if (bd->stat & RX_BD_SF) {
+		debug("ETHOC: " "RX: frame too short\n");
+		ret++;
+	}
+
+	if (bd->stat & RX_BD_DN)
+		debug("ETHOC: " "RX: dribble nibble\n");
+
+	if (bd->stat & RX_BD_CRC) {
+		debug("ETHOC: " "RX: wrong CRC\n");
+		ret++;
+	}
+
+	if (bd->stat & RX_BD_OR) {
+		debug("ETHOC: " "RX: overrun\n");
+		ret++;
+	}
+
+	if (bd->stat & RX_BD_LC) {
+		debug("ETHOC: " "RX: late collision\n");
+		ret++;
+	}
+
+	return ret;
+}
+
+static int ethoc_rx(struct eth_device *dev, int limit)
+{
+	struct ethoc *priv = (struct ethoc *)dev->priv;
+	int count;
+
+	for (count = 0; count < limit; ++count) {
+		u32 entry;
+		struct ethoc_bd bd;
+
+		entry = priv->num_tx + (priv->cur_rx % priv->num_rx);
+		ethoc_read_bd(dev, entry, &bd);
+		if (bd.stat & RX_BD_EMPTY)
+			break;
+
+		debug("%s(): RX buffer %d, %x received\n",
+		      __func__, priv->cur_rx, bd.stat);
+		if (ethoc_update_rx_stats(&bd) == 0) {
+			int size = bd.stat >> 16;
+			size -= 4;	/* strip the CRC */
+			NetReceive((void *)bd.addr, size);
+		}
+
+		/* clear the buffer descriptor so it can be reused */
+		flush_dcache(bd.addr, PKTSIZE_ALIGN);
+		bd.stat &= ~RX_BD_STATS;
+		bd.stat |= RX_BD_EMPTY;
+		ethoc_write_bd(dev, entry, &bd);
+		priv->cur_rx++;
+	}
+
+	return count;
+}
+
+static int ethoc_update_tx_stats(struct ethoc_bd *bd)
+{
+	if (bd->stat & TX_BD_LC)
+		debug("ETHOC: " "TX: late collision\n");
+
+	if (bd->stat & TX_BD_RL)
+		debug("ETHOC: " "TX: retransmit limit\n");
+
+	if (bd->stat & TX_BD_UR)
+		debug("ETHOC: " "TX: underrun\n");
+
+	if (bd->stat & TX_BD_CS)
+		debug("ETHOC: " "TX: carrier sense lost\n");
+
+	return 0;
+}
+
+static void ethoc_tx(struct eth_device *dev)
+{
+	struct ethoc *priv = (struct ethoc *)dev->priv;
+	u32 entry = priv->dty_tx % priv->num_tx;
+	struct ethoc_bd bd;
+
+	ethoc_read_bd(dev, entry, &bd);
+	if ((bd.stat & TX_BD_READY) == 0)
+		(void)ethoc_update_tx_stats(&bd);
+}
+
+static int ethoc_send(struct eth_device *dev, volatile void *packet, int length)
+{
+	struct ethoc *priv = (struct ethoc *)dev->priv;
+	struct ethoc_bd bd;
+	u32 entry;
+	u32 pending;
+	int tmo;
+
+	entry = priv->cur_tx % priv->num_tx;
+	ethoc_read_bd(dev, entry, &bd);
+	if (unlikely(length < ETHOC_ZLEN))
+		bd.stat |= TX_BD_PAD;
+	else
+		bd.stat &= ~TX_BD_PAD;
+	bd.addr = (u32)packet;
+
+	flush_dcache(bd.addr, length);
+	bd.stat &= ~(TX_BD_STATS | TX_BD_LEN_MASK);
+	bd.stat |= TX_BD_LEN(length);
+	ethoc_write_bd(dev, entry, &bd);
+
+	/* start transmit */
+	bd.stat |= TX_BD_READY;
+	ethoc_write_bd(dev, entry, &bd);
+
+	/* wait for transfer to succeed */
+	tmo = get_timer(0) + 5 * CONFIG_SYS_HZ;
+	while (1) {
+		pending = ethoc_read(dev, INT_SOURCE);
+		ethoc_ack_irq(dev, pending & ~INT_MASK_RX);
+		if (pending & INT_MASK_BUSY)
+			debug("%s(): packet dropped\n", __func__);
+
+		if (pending & INT_MASK_TX) {
+			ethoc_tx(dev);
+			break;
+		}
+		if (get_timer(0) >= tmo) {
+			debug("%s(): timed out\n", __func__);
+			return -1;
+		}
+	}
+
+	debug("%s(): packet sent\n", __func__);
+	return 0;
+}
+
+static void ethoc_halt(struct eth_device *dev)
+{
+	ethoc_disable_rx_and_tx(dev);
+}
+
+static int ethoc_recv(struct eth_device *dev)
+{
+	u32 pending;
+
+	pending = ethoc_read(dev, INT_SOURCE);
+	ethoc_ack_irq(dev, pending);
+	if (pending & INT_MASK_BUSY)
+		debug("%s(): packet dropped\n", __func__);
+	if (pending & INT_MASK_RX) {
+		debug("%s(): rx irq\n", __func__);
+		ethoc_rx(dev, PKTBUFSRX);
+	}
+
+	return 0;
+}
+
+int ethoc_initialize(u8 dev_num, int base_addr)
+{
+	struct ethoc *priv;
+	struct eth_device *dev;
+
+	priv = malloc(sizeof(*priv));
+	if (!priv)
+		return 0;
+	dev = malloc(sizeof(*dev));
+	if (!dev) {
+		free(priv);
+		return 0;
+	}
+
+	memset(dev, 0, sizeof(*dev));
+	dev->priv = priv;
+	dev->iobase = base_addr;
+	dev->init = ethoc_init;
+	dev->halt = ethoc_halt;
+	dev->send = ethoc_send;
+	dev->recv = ethoc_recv;
+	sprintf(dev->name, "%s-%hu", "ETHOC", dev_num);
+
+	eth_register(dev);
+	return 1;
+}