arm: A320: driver for FTMAC100 ethernet controller

This patch adds an FTMAC100 ethernet driver for Faraday A320 evaluation board.

Signed-off-by: Po-Yu Chuang <ratbert@faraday-tech.com>
Signed-off-by: Ben Warren <biggerbadderben@gmail.com>

1 files changed, 278 insertions, 0 deletions

diff --git a/drivers/net/ftmac100.c b/drivers/net/ftmac100.c
new file mode 100644
index 0000000..2328cb5
--- /dev/null
+++ b/drivers/net/ftmac100.c
@@ -0,0 +1,278 @@
+/*
+ * Faraday FTMAC100 Ethernet
+ *
+ * (C) Copyright 2009 Faraday Technology
+ * Po-Yu Chuang <ratbert@faraday-tech.com>
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <config.h>
+#include <common.h>
+#include <malloc.h>
+#include <net.h>
+#include <asm/io.h>
+
+#include "ftmac100.h"
+
+#define ETH_ZLEN	60
+
+struct ftmac100_data {
+	volatile struct ftmac100_txdes txdes[1];
+	volatile struct ftmac100_rxdes rxdes[PKTBUFSRX];
+	int rx_index;
+};
+
+/*
+ * Reset MAC
+ */
+static void ftmac100_reset (struct eth_device *dev)
+{
+	struct ftmac100 *ftmac100 = (struct ftmac100 *)dev->iobase;
+
+	debug ("%s()\n", __func__);
+
+	writel (FTMAC100_MACCR_SW_RST, &ftmac100->maccr);
+
+	while (readl (&ftmac100->maccr) & FTMAC100_MACCR_SW_RST)
+		;
+}
+
+/*
+ * Set MAC address
+ */
+static void ftmac100_set_mac (struct eth_device *dev, const unsigned char *mac)
+{
+	struct ftmac100 *ftmac100 = (struct ftmac100 *)dev->iobase;
+	unsigned int maddr = mac[0] << 8 | mac[1];
+	unsigned int laddr = mac[2] << 24 | mac[3] << 16 | mac[4] << 8 | mac[5];
+
+	debug ("%s(%x %x)\n", __func__, maddr, laddr);
+
+	writel (maddr, &ftmac100->mac_madr);
+	writel (laddr, &ftmac100->mac_ladr);
+}
+
+static void ftmac100_set_mac_from_env (struct eth_device *dev)
+{
+	eth_getenv_enetaddr ("ethaddr", dev->enetaddr);
+
+	ftmac100_set_mac (dev, dev->enetaddr);
+}
+
+/*
+ * disable transmitter, receiver
+ */
+static void ftmac100_halt (struct eth_device *dev)
+{
+	struct ftmac100 *ftmac100 = (struct ftmac100 *)dev->iobase;
+
+	debug ("%s()\n", __func__);
+
+	writel (0, &ftmac100->maccr);
+}
+
+static int ftmac100_init (struct eth_device *dev, bd_t *bd)
+{
+	struct ftmac100 *ftmac100 = (struct ftmac100 *)dev->iobase;
+	struct ftmac100_data *priv = dev->priv;
+	volatile struct ftmac100_txdes *txdes = priv->txdes;
+	volatile struct ftmac100_rxdes *rxdes = priv->rxdes;
+	unsigned int maccr;
+	int i;
+
+	debug ("%s()\n", __func__);
+
+	ftmac100_reset (dev);
+
+	/* set the ethernet address */
+
+	ftmac100_set_mac_from_env (dev);
+
+	/* disable all interrupts */
+
+	writel (0, &ftmac100->imr);
+
+	/* initialize descriptors */
+
+	priv->rx_index = 0;
+
+	txdes[0].txdes1			= FTMAC100_TXDES1_EDOTR;
+	rxdes[PKTBUFSRX - 1].rxdes1	= FTMAC100_RXDES1_EDORR;
+
+	for (i = 0; i < PKTBUFSRX; i++) {
+		/* RXBUF_BADR */
+		rxdes[i].rxdes2 = (unsigned int)NetRxPackets[i];
+		rxdes[i].rxdes1 |= FTMAC100_RXDES1_RXBUF_SIZE (PKTSIZE_ALIGN);
+		rxdes[i].rxdes0 = FTMAC100_RXDES0_RXDMA_OWN;
+	}
+
+	/* transmit ring */
+
+	writel ((unsigned int)txdes, &ftmac100->txr_badr);
+
+	/* receive ring */
+
+	writel ((unsigned int)rxdes, &ftmac100->rxr_badr);
+
+	/* poll receive descriptor automatically */
+
+	writel (FTMAC100_APTC_RXPOLL_CNT (1), &ftmac100->aptc);
+
+	/* enable transmitter, receiver */
+
+	maccr = FTMAC100_MACCR_XMT_EN |
+		FTMAC100_MACCR_RCV_EN |
+		FTMAC100_MACCR_XDMA_EN |
+		FTMAC100_MACCR_RDMA_EN |
+		FTMAC100_MACCR_CRC_APD |
+		FTMAC100_MACCR_ENRX_IN_HALFTX |
+		FTMAC100_MACCR_RX_RUNT |
+		FTMAC100_MACCR_RX_BROADPKT;
+
+	writel (maccr, &ftmac100->maccr);
+
+	return 0;
+}
+
+/*
+ * Get a data block via Ethernet
+ */
+static int ftmac100_recv (struct eth_device *dev)
+{
+	struct ftmac100_data *priv = dev->priv;
+	volatile struct ftmac100_rxdes *curr_des;
+	unsigned short rxlen;
+
+	curr_des = &priv->rxdes[priv->rx_index];
+
+	if (curr_des->rxdes0 & FTMAC100_RXDES0_RXDMA_OWN)
+		return -1;
+
+	if (curr_des->rxdes0 & (FTMAC100_RXDES0_RX_ERR |
+				FTMAC100_RXDES0_CRC_ERR |
+				FTMAC100_RXDES0_FTL |
+				FTMAC100_RXDES0_RUNT |
+				FTMAC100_RXDES0_RX_ODD_NB)) {
+		return -1;
+	}
+
+	rxlen = FTMAC100_RXDES0_RFL (curr_des->rxdes0);
+
+	debug ("%s(): RX buffer %d, %x received\n",
+	       __func__, priv->rx_index, rxlen);
+
+	/* pass the packet up to the protocol layers. */
+
+	NetReceive ((void *)curr_des->rxdes2, rxlen);
+
+	/* release buffer to DMA */
+
+	curr_des->rxdes0 |= FTMAC100_RXDES0_RXDMA_OWN;
+
+	priv->rx_index = (priv->rx_index + 1) % PKTBUFSRX;
+
+	return 0;
+}
+
+/*
+ * Send a data block via Ethernet
+ */
+static int
+ftmac100_send (struct eth_device *dev, volatile void *packet, int length)
+{
+	struct ftmac100 *ftmac100 = (struct ftmac100 *)dev->iobase;
+	struct ftmac100_data *priv = dev->priv;
+	volatile struct ftmac100_txdes *curr_des = priv->txdes;
+	int tmo;
+
+	if (curr_des->txdes0 & FTMAC100_TXDES0_TXDMA_OWN) {
+		debug ("%s(): no TX descriptor available\n", __func__);
+		return -1;
+	}
+
+	debug ("%s(%x, %x)\n", __func__, (int)packet, length);
+
+	length = (length < ETH_ZLEN) ? ETH_ZLEN : length;
+
+	/* initiate a transmit sequence */
+
+	curr_des->txdes2 = (unsigned int)packet;	/* TXBUF_BADR */
+
+	curr_des->txdes1 &= FTMAC100_TXDES1_EDOTR;
+	curr_des->txdes1 |= FTMAC100_TXDES1_FTS |
+			    FTMAC100_TXDES1_LTS |
+			    FTMAC100_TXDES1_TXBUF_SIZE (length);
+
+	curr_des->txdes0 = FTMAC100_TXDES0_TXDMA_OWN;
+
+	/* start transmit */
+
+	writel (1, &ftmac100->txpd);
+
+	/* wait for transfer to succeed */
+
+	tmo = get_timer (0) + 5 * CONFIG_SYS_HZ;
+	while (curr_des->txdes0 & FTMAC100_TXDES0_TXDMA_OWN) {
+		if (get_timer (0) >= tmo) {
+			debug ("%s(): timed out\n", __func__);
+			return -1;
+		}
+	}
+
+	debug ("%s(): packet sent\n", __func__);
+
+	return 0;
+}
+
+int ftmac100_initialize (bd_t *bd)
+{
+	struct eth_device *dev;
+	struct ftmac100_data *priv;
+
+	dev = malloc (sizeof *dev);
+	if (!dev) {
+		printf ("%s(): failed to allocate dev\n", __func__);
+		goto out;
+	}
+
+	/* Transmit and receive descriptors should align to 16 bytes */
+
+	priv = memalign (16, sizeof (struct ftmac100_data));
+	if (!priv) {
+		printf ("%s(): failed to allocate priv\n", __func__);
+		goto free_dev;
+	}
+
+	memset (dev, 0, sizeof (*dev));
+	memset (priv, 0, sizeof (*priv));
+
+	sprintf (dev->name, "FTMAC100");
+	dev->iobase	= CONFIG_FTMAC100_BASE;
+	dev->init	= ftmac100_init;
+	dev->halt	= ftmac100_halt;
+	dev->send	= ftmac100_send;
+	dev->recv	= ftmac100_recv;
+	dev->priv	= priv;
+
+	eth_register (dev);
+
+	return 1;
+
+free_dev:
+	free (dev);
+out:
+	return 0;
+}