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Message-Id: <1264164677-6397-2-git-send-email-kristoffer@gaisler.com>
Date: Fri, 22 Jan 2010 13:51:17 +0100
From: Kristoffer Glembo <kristoffer@...sler.com>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, Kristoffer Glembo <kristoffer@...sler.com>
Subject: [PATCH 1/1 V3] net: Add Aeroflex Gaisler 10/100/1G Ethernet MAC driver
Adds device driver for Aeroflex Gaisler 10/100 and 10/100/1G Ethernet MAC IP cores.
Signed-off-by: Kristoffer Glembo <kristoffer@...sler.com>
---
MAINTAINERS | 6 +
drivers/net/Kconfig | 9 +
drivers/net/Makefile | 1 +
drivers/net/greth.c | 1574 ++++++++++++++++++++++++++++++++++++++++++++++++++
drivers/net/greth.h | 149 +++++
5 files changed, 1739 insertions(+), 0 deletions(-)
create mode 100644 drivers/net/greth.c
create mode 100644 drivers/net/greth.h
diff --git a/MAINTAINERS b/MAINTAINERS
index 745643b..45c047c 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2372,6 +2372,12 @@ F: Documentation/isdn/README.gigaset
F: drivers/isdn/gigaset/
F: include/linux/gigaset_dev.h
+GRETH 10/100/1G Ethernet MAC device driver
+M: Kristoffer Glembo <kristoffer@...sler.com>
+L: netdev@...r.kernel.org
+S: Maintained
+F: drivers/net/greth*
+
HARD DRIVE ACTIVE PROTECTION SYSTEM (HDAPS) DRIVER
M: Frank Seidel <frank@...eidel.de>
L: lm-sensors@...sensors.org
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index dd9a09c..d600074 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -1955,6 +1955,15 @@ source "drivers/net/fs_enet/Kconfig"
source "drivers/net/octeon/Kconfig"
+config GRETH
+ tristate "Aeroflex Gaisler GRETH Ethernet MAC support"
+ depends on OF
+ select PHYLIB
+ select CRC32
+ help
+ Say Y here if you want to use the Aeroflex Gaisler GRETH Ethernet MAC.
+
+
endif # NET_ETHERNET
#
diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index ad1346d..9f12170 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -246,6 +246,7 @@ pasemi_mac_driver-objs := pasemi_mac.o pasemi_mac_ethtool.o
obj-$(CONFIG_MLX4_CORE) += mlx4/
obj-$(CONFIG_ENC28J60) += enc28j60.o
obj-$(CONFIG_ETHOC) += ethoc.o
+obj-$(CONFIG_GRETH) += greth.o
obj-$(CONFIG_XTENSA_XT2000_SONIC) += xtsonic.o
diff --git a/drivers/net/greth.c b/drivers/net/greth.c
new file mode 100644
index 0000000..ef90ab3
--- /dev/null
+++ b/drivers/net/greth.c
@@ -0,0 +1,1574 @@
+/*
+ * Aeroflex Gaisler GRETH 10/100/1G Ethernet MAC.
+ *
+ * 2005-2009 (c) Aeroflex Gaisler AB
+ *
+ * This driver supports GRETH 10/100 and GRETH 10/100/1G Ethernet MACs
+ * available in the GRLIB VHDL IP core library.
+ *
+ * Full documentation of both cores can be found here:
+ * http://www.gaisler.com/products/grlib/grip.pdf
+ *
+ * The Gigabit version supports scatter/gather DMA, any alignment of
+ * buffers and checksum offloading.
+ *
+ * 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.
+ *
+ * Contributors: Kristoffer Glembo
+ * Daniel Hellstrom
+ * Marko Isomaki
+ */
+
+#include <linux/module.h>
+#include <linux/uaccess.h>
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/io.h>
+#include <linux/crc32.h>
+#include <linux/mii.h>
+#include <linux/of_device.h>
+#include <linux/of_platform.h>
+#include <asm/cacheflush.h>
+#include <asm/byteorder.h>
+
+#ifdef CONFIG_SPARC
+#include <asm/idprom.h>
+#endif
+
+#include "greth.h"
+
+#define GRETH_DEF_MSG_ENABLE \
+ (NETIF_MSG_DRV | \
+ NETIF_MSG_PROBE | \
+ NETIF_MSG_LINK | \
+ NETIF_MSG_IFDOWN | \
+ NETIF_MSG_IFUP | \
+ NETIF_MSG_RX_ERR | \
+ NETIF_MSG_TX_ERR)
+
+static int greth_debug = -1; /* -1 == use GRETH_DEF_MSG_ENABLE as value */
+module_param(greth_debug, int, 0);
+MODULE_PARM_DESC(greth_debug, "GRETH bitmapped debugging message enable value");
+
+/* Accept MAC address of the form macaddr=0x08,0x00,0x20,0x30,0x40,0x50 */
+static int macaddr[6];
+module_param_array(macaddr, int, NULL, 0);
+MODULE_PARM_DESC(macaddr, "GRETH Ethernet MAC address");
+
+static int greth_open(struct net_device *dev);
+static int greth_start_xmit(struct sk_buff *skb, struct net_device *dev);
+static int greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev);
+static int greth_rx(struct net_device *dev, int limit);
+static int greth_rx_gbit(struct net_device *dev, int limit);
+static void greth_clean_tx(struct net_device *dev);
+static void greth_clean_tx_gbit(struct net_device *dev);
+static irqreturn_t greth_interrupt(int irq, void *dev_id);
+static int greth_close(struct net_device *dev);
+static struct net_device_stats *greth_get_stats(struct net_device *dev);
+static int greth_set_mac_add(struct net_device *dev, void *p);
+static void greth_set_multicast_list(struct net_device *dev);
+
+#define GRETH_REGLOAD(a) (be32_to_cpu(__raw_readl(&(a))))
+#define GRETH_REGSAVE(a, v) (__raw_writel(cpu_to_be32(v), &(a)))
+#define GRETH_REGORIN(a, v) (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) | (v))))
+#define GRETH_REGANDIN(a, v) (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) & (v))))
+
+#define NEXT_TX(N) (((N) + 1) & GRETH_TXBD_NUM_MASK)
+#define SKIP_TX(N, C) (((N) + C) & GRETH_TXBD_NUM_MASK)
+#define NEXT_RX(N) (((N) + 1) & GRETH_RXBD_NUM_MASK)
+
+static void greth_print_rx_packet(unsigned long addr, int len)
+{
+ unsigned char *data = (unsigned char *) addr;
+ print_hex_dump(KERN_DEBUG, "RX: ", DUMP_PREFIX_OFFSET, 16, 1,
+ data, len, true);
+}
+
+static void greth_print_tx_packet(struct sk_buff *skb)
+{
+ int i;
+ int length;
+
+ if (skb_shinfo(skb)->nr_frags == 0)
+ length = skb->len;
+ else
+ length = skb_headlen(skb);
+
+ print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
+ skb->data, length, true);
+
+ for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
+
+ print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
+ phys_to_virt(page_to_phys(skb_shinfo(skb)->frags[i].page)) +
+ skb_shinfo(skb)->frags[i].page_offset,
+ length, true);
+ }
+}
+
+static inline void greth_enable_tx(struct greth_private *greth)
+{
+ wmb();
+ GRETH_REGORIN(greth->regs->control, GRETH_TXEN);
+}
+
+static inline void greth_disable_tx(struct greth_private *greth)
+{
+ GRETH_REGANDIN(greth->regs->control, ~GRETH_TXEN);
+}
+
+static inline void greth_enable_rx(struct greth_private *greth)
+{
+ wmb();
+ GRETH_REGORIN(greth->regs->control, GRETH_RXEN);
+}
+
+static inline void greth_disable_rx(struct greth_private *greth)
+{
+ GRETH_REGANDIN(greth->regs->control, ~GRETH_RXEN);
+}
+
+static inline void greth_enable_irqs(struct greth_private *greth)
+{
+ GRETH_REGORIN(greth->regs->control, GRETH_RXI | GRETH_TXI);
+}
+
+static inline void greth_disable_irqs(struct greth_private *greth)
+{
+ GRETH_REGANDIN(greth->regs->control, ~(GRETH_RXI|GRETH_TXI));
+}
+
+static inline void greth_write_bd(u32 *bd, u32 val)
+{
+ __raw_writel(cpu_to_be32(val), bd);
+}
+
+static inline u32 greth_read_bd(u32 *bd)
+{
+ return be32_to_cpu(__raw_readl(bd));
+}
+
+static void greth_clean_rings(struct greth_private *greth)
+{
+ int i;
+ struct greth_bd *rx_bdp = greth->rx_bd_base;
+ struct greth_bd *tx_bdp = greth->tx_bd_base;
+
+ if (greth->gbit_mac) {
+
+ /* Free and unmap RX buffers */
+ for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
+ if (greth->rx_skbuff[i] != NULL) {
+ dev_kfree_skb(greth->rx_skbuff[i]);
+ dma_unmap_single(greth->dev,
+ greth_read_bd(&rx_bdp->addr),
+ MAX_FRAME_SIZE+NET_IP_ALIGN,
+ DMA_FROM_DEVICE);
+ }
+ }
+
+ /* TX buffers */
+ while (greth->tx_free < GRETH_TXBD_NUM) {
+
+ struct sk_buff *skb = greth->tx_skbuff[greth->tx_last];
+ int nr_frags = skb_shinfo(skb)->nr_frags;
+ tx_bdp = greth->tx_bd_base + greth->tx_last;
+ greth->tx_last = NEXT_TX(greth->tx_last);
+
+ dma_unmap_single(greth->dev,
+ greth_read_bd(&tx_bdp->addr),
+ skb_headlen(skb),
+ DMA_TO_DEVICE);
+
+ for (i = 0; i < nr_frags; i++) {
+ skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
+ tx_bdp = greth->tx_bd_base + greth->tx_last;
+
+ dma_unmap_page(greth->dev,
+ greth_read_bd(&tx_bdp->addr),
+ frag->size,
+ DMA_TO_DEVICE);
+
+ greth->tx_last = NEXT_TX(greth->tx_last);
+ }
+ greth->tx_free += nr_frags+1;
+ dev_kfree_skb(skb);
+ }
+
+
+ } else { /* 10/100 Mbps MAC */
+
+ for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
+ kfree(greth->rx_bufs[i]);
+ dma_unmap_single(greth->dev,
+ greth_read_bd(&rx_bdp->addr),
+ MAX_FRAME_SIZE,
+ DMA_FROM_DEVICE);
+ }
+ for (i = 0; i < GRETH_TXBD_NUM; i++, tx_bdp++) {
+ kfree(greth->tx_bufs[i]);
+ dma_unmap_single(greth->dev,
+ greth_read_bd(&tx_bdp->addr),
+ MAX_FRAME_SIZE,
+ DMA_TO_DEVICE);
+ }
+ }
+}
+
+static int greth_init_rings(struct greth_private *greth)
+{
+ struct sk_buff *skb;
+ struct greth_bd *rx_bd, *tx_bd;
+ u32 dma_addr;
+ int i;
+
+ rx_bd = greth->rx_bd_base;
+ tx_bd = greth->tx_bd_base;
+
+ /* Initialize descriptor rings and buffers */
+ if (greth->gbit_mac) {
+
+ for (i = 0; i < GRETH_RXBD_NUM; i++) {
+ skb = netdev_alloc_skb(greth->netdev, MAX_FRAME_SIZE+NET_IP_ALIGN);
+ if (skb == NULL) {
+ if (netif_msg_ifup(greth))
+ dev_err(greth->dev, "Error allocating DMA ring.\n");
+ goto cleanup;
+ }
+ skb_reserve(skb, NET_IP_ALIGN);
+ dma_addr = dma_map_single(greth->dev,
+ skb->data,
+ MAX_FRAME_SIZE+NET_IP_ALIGN,
+ DMA_FROM_DEVICE);
+
+ if (dma_mapping_error(greth->dev, dma_addr)) {
+ if (netif_msg_ifup(greth))
+ dev_err(greth->dev, "Could not create initial DMA mapping\n");
+ goto cleanup;
+ }
+ greth->rx_skbuff[i] = skb;
+ greth_write_bd(&rx_bd[i].addr, dma_addr);
+ greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
+ }
+
+ } else {
+
+ /* 10/100 MAC uses a fixed set of buffers and copy to/from SKBs */
+ for (i = 0; i < GRETH_RXBD_NUM; i++) {
+
+ greth->rx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
+
+ if (greth->rx_bufs[i] == NULL) {
+ if (netif_msg_ifup(greth))
+ dev_err(greth->dev, "Error allocating DMA ring.\n");
+ goto cleanup;
+ }
+
+ dma_addr = dma_map_single(greth->dev,
+ greth->rx_bufs[i],
+ MAX_FRAME_SIZE,
+ DMA_FROM_DEVICE);
+
+ if (dma_mapping_error(greth->dev, dma_addr)) {
+ if (netif_msg_ifup(greth))
+ dev_err(greth->dev, "Could not create initial DMA mapping\n");
+ goto cleanup;
+ }
+ greth_write_bd(&rx_bd[i].addr, dma_addr);
+ greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
+ }
+ for (i = 0; i < GRETH_TXBD_NUM; i++) {
+
+ greth->tx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
+
+ if (greth->tx_bufs[i] == NULL) {
+ if (netif_msg_ifup(greth))
+ dev_err(greth->dev, "Error allocating DMA ring.\n");
+ goto cleanup;
+ }
+
+ dma_addr = dma_map_single(greth->dev,
+ greth->tx_bufs[i],
+ MAX_FRAME_SIZE,
+ DMA_TO_DEVICE);
+
+ if (dma_mapping_error(greth->dev, dma_addr)) {
+ if (netif_msg_ifup(greth))
+ dev_err(greth->dev, "Could not create initial DMA mapping\n");
+ goto cleanup;
+ }
+ greth_write_bd(&tx_bd[i].addr, dma_addr);
+ greth_write_bd(&tx_bd[i].stat, 0);
+ }
+ }
+ greth_write_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat,
+ greth_read_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat) | GRETH_BD_WR);
+
+ /* Initialize pointers. */
+ greth->rx_cur = 0;
+ greth->tx_next = 0;
+ greth->tx_last = 0;
+ greth->tx_free = GRETH_TXBD_NUM;
+
+ /* Initialize descriptor base address */
+ GRETH_REGSAVE(greth->regs->tx_desc_p, greth->tx_bd_base_phys);
+ GRETH_REGSAVE(greth->regs->rx_desc_p, greth->rx_bd_base_phys);
+
+ return 0;
+
+cleanup:
+ greth_clean_rings(greth);
+ return -ENOMEM;
+}
+
+static int greth_open(struct net_device *dev)
+{
+ struct greth_private *greth = netdev_priv(dev);
+ int err;
+
+ err = greth_init_rings(greth);
+ if (err) {
+ if (netif_msg_ifup(greth))
+ dev_err(&dev->dev, "Could not allocate memory for DMA rings\n");
+ return err;
+ }
+
+ err = request_irq(greth->irq, greth_interrupt, 0, "eth", (void *) dev);
+ if (err) {
+ if (netif_msg_ifup(greth))
+ dev_err(&dev->dev, "Could not allocate interrupt %d\n", dev->irq);
+ greth_clean_rings(greth);
+ return err;
+ }
+
+ if (netif_msg_ifup(greth))
+ dev_dbg(&dev->dev, " starting queue\n");
+ netif_start_queue(dev);
+
+ napi_enable(&greth->napi);
+
+ greth_enable_irqs(greth);
+ greth_enable_tx(greth);
+ greth_enable_rx(greth);
+ return 0;
+
+}
+
+static int greth_close(struct net_device *dev)
+{
+ struct greth_private *greth = netdev_priv(dev);
+
+ napi_disable(&greth->napi);
+
+ greth_disable_tx(greth);
+
+ netif_stop_queue(dev);
+
+ free_irq(greth->irq, (void *) dev);
+
+ greth_clean_rings(greth);
+
+ return 0;
+}
+
+static int greth_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct greth_private *greth = netdev_priv(dev);
+ struct greth_bd *bdp;
+ int err = NETDEV_TX_OK;
+ u32 status, dma_addr;
+
+ bdp = greth->tx_bd_base + greth->tx_next;
+
+ if (unlikely(greth->tx_free <= 0)) {
+ netif_stop_queue(dev);
+ err = NETDEV_TX_BUSY;
+ goto out;
+ }
+
+ if (netif_msg_pktdata(greth))
+ greth_print_tx_packet(skb);
+
+
+ if (unlikely(skb->len > MAX_FRAME_SIZE)) {
+ greth->stats.tx_errors++;
+ goto out;
+ }
+
+ dma_addr = greth_read_bd(&bdp->addr);
+
+ memcpy((unsigned char *) phys_to_virt(dma_addr), skb->data, skb->len);
+
+ dma_sync_single_for_device(greth->dev, dma_addr, skb->len, DMA_TO_DEVICE);
+
+
+ status = GRETH_BD_EN | (skb->len & GRETH_BD_LEN);
+
+ /* Wrap around descriptor ring */
+ if (greth->tx_next == GRETH_TXBD_NUM_MASK) {
+ status |= GRETH_BD_WR;
+ }
+
+ greth->tx_next = NEXT_TX(greth->tx_next);
+ greth->tx_free--;
+
+ /* No more descriptors */
+ if (unlikely(greth->tx_free == 0)) {
+
+ /* Free transmitted descriptors */
+ greth_clean_tx(dev);
+
+ /* If nothing was cleaned, stop queue & wait for irq */
+ if (unlikely(greth->tx_free == 0)) {
+ status |= GRETH_BD_IE;
+ netif_stop_queue(dev);
+ }
+ }
+
+ /* Write descriptor control word and enable transmission */
+ greth_write_bd(&bdp->stat, status);
+ greth_enable_tx(greth);
+
+out:
+ dev_kfree_skb(skb);
+ return err;
+}
+
+
+static int greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct greth_private *greth = netdev_priv(dev);
+ struct greth_bd *bdp;
+ u32 status = 0, dma_addr;
+ int curr_tx, nr_frags, i, err = NETDEV_TX_OK;
+
+ nr_frags = skb_shinfo(skb)->nr_frags;
+
+ if (greth->tx_free < nr_frags + 1) {
+ netif_stop_queue(dev);
+ err = NETDEV_TX_BUSY;
+ goto out;
+ }
+
+ if (netif_msg_pktdata(greth))
+ greth_print_tx_packet(skb);
+
+ if (unlikely(skb->len > MAX_FRAME_SIZE)) {
+ greth->stats.tx_errors++;
+ goto out;
+ }
+
+ /* Save skb pointer. */
+ greth->tx_skbuff[greth->tx_next] = skb;
+
+ /* Linear buf */
+ if (nr_frags != 0)
+ status = GRETH_TXBD_MORE;
+
+ status |= GRETH_TXBD_CSALL;
+ status |= skb_headlen(skb) & GRETH_BD_LEN;
+ if (greth->tx_next == GRETH_TXBD_NUM_MASK)
+ status |= GRETH_BD_WR;
+
+
+ bdp = greth->tx_bd_base + greth->tx_next;
+ greth_write_bd(&bdp->stat, status);
+ dma_addr = dma_map_single(greth->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);
+
+ if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
+ goto map_error;
+
+ greth_write_bd(&bdp->addr, dma_addr);
+
+ curr_tx = NEXT_TX(greth->tx_next);
+
+ /* Frags */
+ for (i = 0; i < nr_frags; i++) {
+ skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
+ greth->tx_skbuff[curr_tx] = NULL;
+ bdp = greth->tx_bd_base + curr_tx;
+
+ status = GRETH_TXBD_CSALL;
+ status |= frag->size & GRETH_BD_LEN;
+
+ /* Wrap around descriptor ring */
+ if (curr_tx == GRETH_TXBD_NUM_MASK)
+ status |= GRETH_BD_WR;
+
+ /* More fragments left */
+ if (i < nr_frags - 1)
+ status |= GRETH_TXBD_MORE;
+
+ /* ... last fragment, check if out of descriptors */
+ else if (greth->tx_free - nr_frags - 1 < (MAX_SKB_FRAGS + 1)) {
+
+ /* Enable interrupts and stop queue */
+ status |= GRETH_BD_IE;
+ netif_stop_queue(dev);
+ }
+
+ greth_write_bd(&bdp->stat, status);
+
+ dma_addr = dma_map_page(greth->dev,
+ frag->page,
+ frag->page_offset,
+ frag->size,
+ DMA_TO_DEVICE);
+
+ if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
+ goto frag_map_error;
+
+ greth_write_bd(&bdp->addr, dma_addr);
+
+ curr_tx = NEXT_TX(curr_tx);
+ }
+
+ wmb();
+
+ /* Enable the descriptors that we configured ... */
+ for (i = 0; i < nr_frags + 1; i++) {
+ bdp = greth->tx_bd_base + greth->tx_next;
+ greth_write_bd(&bdp->stat, greth_read_bd(&bdp->stat) | GRETH_BD_EN);
+ greth->tx_next = NEXT_TX(greth->tx_next);
+ greth->tx_free--;
+ }
+
+ greth_enable_tx(greth);
+
+ return NETDEV_TX_OK;
+
+frag_map_error:
+ /* Unmap SKB mappings that succeeded */
+ for (i = 0; greth->tx_next + i != curr_tx; i++) {
+ bdp = greth->tx_bd_base + greth->tx_next + i;
+ dma_unmap_single(greth->dev,
+ greth_read_bd(&bdp->addr),
+ greth_read_bd(&bdp->stat) & GRETH_BD_LEN,
+ DMA_TO_DEVICE);
+ }
+map_error:
+ if (net_ratelimit())
+ dev_warn(greth->dev, "Could not create TX DMA mapping\n");
+ dev_kfree_skb(skb);
+ return NETDEV_TX_OK;
+
+out:
+ return err;
+}
+
+
+static irqreturn_t greth_interrupt(int irq, void *dev_id)
+{
+ struct net_device *dev = dev_id;
+ struct greth_private *greth;
+ u32 status;
+ irqreturn_t retval = IRQ_NONE;
+
+ greth = netdev_priv(dev);
+
+ spin_lock(&greth->devlock);
+
+ /* Get the interrupt events that caused us to be here. */
+ status = GRETH_REGLOAD(greth->regs->status);
+
+ /* Handle rx and tx interrupts through poll */
+ if (status & (GRETH_INT_RX | GRETH_INT_TX)) {
+
+ /* Clear interrupt status */
+ GRETH_REGORIN(greth->regs->status,
+ status & (GRETH_INT_RX | GRETH_INT_TX));
+
+ retval = IRQ_HANDLED;
+
+ /* Disable interrupts and schedule poll() */
+ greth_disable_irqs(greth);
+ napi_schedule(&greth->napi);
+ }
+
+ mmiowb();
+ spin_unlock(&greth->devlock);
+
+ return retval;
+}
+
+static void greth_clean_tx(struct net_device *dev)
+{
+ struct greth_private *greth;
+ struct greth_bd *bdp;
+ u32 stat;
+
+ greth = netdev_priv(dev);
+
+ while (1) {
+ bdp = greth->tx_bd_base + greth->tx_last;
+ stat = greth_read_bd(&bdp->stat);
+
+ if (unlikely(stat & GRETH_BD_EN))
+ break;
+
+ if (greth->tx_free == GRETH_TXBD_NUM)
+ break;
+
+ /* Check status for errors */
+ if (unlikely(stat & GRETH_TXBD_STATUS)) {
+ greth->stats.tx_errors++;
+ if (stat & GRETH_TXBD_ERR_AL)
+ greth->stats.tx_aborted_errors++;
+ if (stat & GRETH_TXBD_ERR_UE)
+ greth->stats.tx_fifo_errors++;
+ }
+ greth->stats.tx_packets++;
+ greth->tx_last = NEXT_TX(greth->tx_last);
+ greth->tx_free++;
+ }
+
+ if (greth->tx_free > 0) {
+ netif_wake_queue(dev);
+ }
+
+}
+
+static inline void greth_update_tx_stats(struct greth_private *greth, u32 stat)
+{
+ /* Check status for errors */
+ if (unlikely(stat & GRETH_TXBD_STATUS)) {
+ greth->stats.tx_errors++;
+ if (stat & GRETH_TXBD_ERR_AL)
+ greth->stats.tx_aborted_errors++;
+ if (stat & GRETH_TXBD_ERR_UE)
+ greth->stats.tx_fifo_errors++;
+ if (stat & GRETH_TXBD_ERR_LC)
+ greth->stats.tx_aborted_errors++;
+ }
+ greth->stats.tx_packets++;
+}
+
+static void greth_clean_tx_gbit(struct net_device *dev)
+{
+ struct greth_private *greth;
+ struct greth_bd *bdp, *bdp_last_frag;
+ struct sk_buff *skb;
+ u32 stat;
+ int nr_frags, i;
+
+ greth = netdev_priv(dev);
+
+ while (greth->tx_free < GRETH_TXBD_NUM) {
+
+ skb = greth->tx_skbuff[greth->tx_last];
+
+ nr_frags = skb_shinfo(skb)->nr_frags;
+
+ /* We only clean fully completed SKBs */
+ bdp_last_frag = greth->tx_bd_base + SKIP_TX(greth->tx_last, nr_frags);
+ stat = bdp_last_frag->stat;
+
+ if (stat & GRETH_BD_EN)
+ break;
+
+ greth->tx_skbuff[greth->tx_last] = NULL;
+
+ greth_update_tx_stats(greth, stat);
+
+ bdp = greth->tx_bd_base + greth->tx_last;
+
+ greth->tx_last = NEXT_TX(greth->tx_last);
+
+ dma_unmap_single(greth->dev,
+ greth_read_bd(&bdp->addr),
+ skb_headlen(skb),
+ DMA_TO_DEVICE);
+
+ for (i = 0; i < nr_frags; i++) {
+ skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
+ bdp = greth->tx_bd_base + greth->tx_last;
+
+ dma_unmap_page(greth->dev,
+ greth_read_bd(&bdp->addr),
+ frag->size,
+ DMA_TO_DEVICE);
+
+ greth->tx_last = NEXT_TX(greth->tx_last);
+ }
+ greth->tx_free += nr_frags+1;
+ dev_kfree_skb(skb);
+ }
+ if (greth->tx_free > (MAX_SKB_FRAGS + 1)) {
+ netif_wake_queue(dev);
+ }
+}
+
+static int greth_pending_packets(struct greth_private *greth)
+{
+ struct greth_bd *bdp;
+ u32 status;
+ bdp = greth->rx_bd_base + greth->rx_cur;
+ status = greth_read_bd(&bdp->stat);
+ if (status & GRETH_BD_EN)
+ return 0;
+ else
+ return 1;
+}
+
+static int greth_rx(struct net_device *dev, int limit)
+{
+ struct greth_private *greth;
+ struct greth_bd *bdp;
+ struct sk_buff *skb;
+ int pkt_len;
+ int bad, count;
+ u32 status, dma_addr;
+
+ greth = netdev_priv(dev);
+
+ for (count = 0; count < limit; ++count) {
+
+ bdp = greth->rx_bd_base + greth->rx_cur;
+ status = greth_read_bd(&bdp->stat);
+ dma_addr = greth_read_bd(&bdp->addr);
+ bad = 0;
+
+ if (unlikely(status & GRETH_BD_EN)) {
+ break;
+ }
+
+ /* Check status for errors. */
+ if (unlikely(status & GRETH_RXBD_STATUS)) {
+ if (status & GRETH_RXBD_ERR_FT) {
+ greth->stats.rx_length_errors++;
+ bad = 1;
+ }
+ if (status & (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE)) {
+ greth->stats.rx_frame_errors++;
+ bad = 1;
+ }
+ if (status & GRETH_RXBD_ERR_CRC) {
+ greth->stats.rx_crc_errors++;
+ bad = 1;
+ }
+ }
+ if (unlikely(bad)) {
+ greth->stats.rx_errors++;
+
+ } else {
+
+ pkt_len = status & GRETH_BD_LEN;
+
+ skb = netdev_alloc_skb(dev, pkt_len + NET_IP_ALIGN);
+
+ if (unlikely(skb == NULL)) {
+
+ if (net_ratelimit())
+ dev_warn(&dev->dev, "low on memory - " "packet dropped\n");
+
+ greth->stats.rx_dropped++;
+
+ } else {
+ skb_reserve(skb, NET_IP_ALIGN);
+ skb->dev = dev;
+
+ dma_sync_single_for_cpu(greth->dev,
+ dma_addr,
+ pkt_len,
+ DMA_FROM_DEVICE);
+
+ if (netif_msg_pktdata(greth))
+ greth_print_rx_packet(phys_to_virt(dma_addr), pkt_len);
+
+ memcpy(skb_put(skb, pkt_len), phys_to_virt(dma_addr), pkt_len);
+
+ skb->protocol = eth_type_trans(skb, dev);
+ greth->stats.rx_packets++;
+ netif_receive_skb(skb);
+ }
+ }
+
+ status = GRETH_BD_EN | GRETH_BD_IE;
+ if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
+ status |= GRETH_BD_WR;
+ }
+
+ wmb();
+ greth_write_bd(&bdp->stat, status);
+
+ dma_sync_single_for_device(greth->dev, dma_addr, MAX_FRAME_SIZE, DMA_FROM_DEVICE);
+
+ greth_enable_rx(greth);
+
+ greth->rx_cur = NEXT_RX(greth->rx_cur);
+ }
+
+ return count;
+}
+
+static inline int hw_checksummed(u32 status)
+{
+
+ if (status & GRETH_RXBD_IP_FRAG)
+ return 0;
+
+ if (status & GRETH_RXBD_IP && status & GRETH_RXBD_IP_CSERR)
+ return 0;
+
+ if (status & GRETH_RXBD_UDP && status & GRETH_RXBD_UDP_CSERR)
+ return 0;
+
+ if (status & GRETH_RXBD_TCP && status & GRETH_RXBD_TCP_CSERR)
+ return 0;
+
+ return 1;
+}
+
+static int greth_rx_gbit(struct net_device *dev, int limit)
+{
+ struct greth_private *greth;
+ struct greth_bd *bdp;
+ struct sk_buff *skb, *newskb;
+ int pkt_len;
+ int bad, count = 0;
+ u32 status, dma_addr;
+
+ greth = netdev_priv(dev);
+
+ for (count = 0; count < limit; ++count) {
+
+ bdp = greth->rx_bd_base + greth->rx_cur;
+ skb = greth->rx_skbuff[greth->rx_cur];
+ status = greth_read_bd(&bdp->stat);
+ bad = 0;
+
+ if (status & GRETH_BD_EN)
+ break;
+
+ /* Check status for errors. */
+ if (unlikely(status & GRETH_RXBD_STATUS)) {
+
+ if (status & GRETH_RXBD_ERR_FT) {
+ greth->stats.rx_length_errors++;
+ bad = 1;
+ } else if (status &
+ (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE | GRETH_RXBD_ERR_LE)) {
+ greth->stats.rx_frame_errors++;
+ bad = 1;
+ } else if (status & GRETH_RXBD_ERR_CRC) {
+ greth->stats.rx_crc_errors++;
+ bad = 1;
+ }
+ }
+
+ /* Allocate new skb to replace current */
+ newskb = netdev_alloc_skb(dev, MAX_FRAME_SIZE + NET_IP_ALIGN);
+
+ if (!bad && newskb) {
+ skb_reserve(newskb, NET_IP_ALIGN);
+
+ dma_addr = dma_map_single(greth->dev,
+ newskb->data,
+ MAX_FRAME_SIZE + NET_IP_ALIGN,
+ DMA_FROM_DEVICE);
+
+ if (!dma_mapping_error(greth->dev, dma_addr)) {
+ /* Process the incoming frame. */
+ pkt_len = status & GRETH_BD_LEN;
+
+ dma_unmap_single(greth->dev,
+ greth_read_bd(&bdp->addr),
+ MAX_FRAME_SIZE + NET_IP_ALIGN,
+ DMA_FROM_DEVICE);
+
+ if (netif_msg_pktdata(greth))
+ greth_print_rx_packet(phys_to_virt(greth_read_bd(&bdp->addr)), pkt_len);
+
+ skb_put(skb, pkt_len);
+
+ if (hw_checksummed(status))
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ else
+ skb->ip_summed = CHECKSUM_NONE;
+
+ skb->dev = dev;
+ skb->protocol = eth_type_trans(skb, dev);
+ greth->stats.rx_packets++;
+ netif_receive_skb(skb);
+
+ greth->rx_skbuff[greth->rx_cur] = newskb;
+ greth_write_bd(&bdp->addr, dma_addr);
+ } else {
+ if (net_ratelimit())
+ dev_warn(greth->dev, "Could not create DMA mapping, dropping packet\n");
+ dev_kfree_skb(newskb);
+ greth->stats.rx_dropped++;
+ }
+ } else {
+ if (net_ratelimit())
+ dev_warn(greth->dev, "Could not allocate SKB, dropping packet\n");
+ greth->stats.rx_dropped++;
+ }
+
+ status = GRETH_BD_EN | GRETH_BD_IE;
+ if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
+ status |= GRETH_BD_WR;
+ }
+
+ wmb();
+ greth_write_bd(&bdp->stat, status);
+ greth_enable_rx(greth);
+ greth->rx_cur = NEXT_RX(greth->rx_cur);
+ }
+
+ return count;
+
+}
+
+static int greth_poll(struct napi_struct *napi, int budget)
+{
+ struct greth_private *greth;
+ int work_done = 0;
+ greth = container_of(napi, struct greth_private, napi);
+
+ if (greth->gbit_mac) {
+ greth_clean_tx_gbit(greth->netdev);
+ } else {
+ greth_clean_tx(greth->netdev);
+ }
+
+restart_poll:
+ if (greth->gbit_mac) {
+ work_done += greth_rx_gbit(greth->netdev, budget - work_done);
+ } else {
+ work_done += greth_rx(greth->netdev, budget - work_done);
+ }
+
+ if (work_done < budget) {
+
+ napi_complete(napi);
+
+ if (greth_pending_packets(greth)) {
+ napi_reschedule(napi);
+ goto restart_poll;
+ }
+ }
+
+ greth_enable_irqs(greth);
+ return work_done;
+}
+
+static struct net_device_stats *greth_get_stats(struct net_device *dev)
+{
+ struct greth_private *greth = netdev_priv(dev);
+ return &greth->stats;
+}
+
+static int greth_set_mac_add(struct net_device *dev, void *p)
+{
+ struct sockaddr *addr = p;
+ struct greth_private *greth;
+ struct greth_regs *regs;
+
+ greth = (struct greth_private *) netdev_priv(dev);
+ regs = (struct greth_regs *) greth->regs;
+
+ if (!is_valid_ether_addr(addr->sa_data))
+ return -EINVAL;
+
+ memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
+
+ GRETH_REGSAVE(regs->esa_msb, addr->sa_data[0] << 8 | addr->sa_data[1]);
+ GRETH_REGSAVE(regs->esa_lsb,
+ addr->sa_data[2] << 24 | addr->
+ sa_data[3] << 16 | addr->sa_data[4] << 8 | addr->sa_data[5]);
+ return 0;
+}
+
+static u32 greth_hash_get_index(__u8 *addr)
+{
+ return (ether_crc(6, addr)) & 0x3F;
+}
+
+static void greth_set_hash_filter(struct net_device *dev)
+{
+ struct dev_mc_list *curr;
+ struct greth_private *greth = (struct greth_private *) netdev_priv(dev);
+ struct greth_regs *regs = (struct greth_regs *) greth->regs;
+ u32 mc_filter[2];
+ unsigned int i, bitnr;
+
+ mc_filter[0] = mc_filter[1] = 0;
+
+ curr = dev->mc_list;
+
+ for (i = 0; i < dev->mc_count; i++, curr = curr->next) {
+
+ if (!curr)
+ break; /* unexpected end of list */
+
+ bitnr = greth_hash_get_index(curr->dmi_addr);
+ mc_filter[bitnr >> 5] |= 1 << (bitnr & 31);
+ }
+
+ GRETH_REGSAVE(regs->hash_msb, mc_filter[1]);
+ GRETH_REGSAVE(regs->hash_lsb, mc_filter[0]);
+}
+
+static void greth_set_multicast_list(struct net_device *dev)
+{
+ int cfg;
+ struct greth_private *greth = netdev_priv(dev);
+ struct greth_regs *regs = (struct greth_regs *) greth->regs;
+
+ cfg = GRETH_REGLOAD(regs->control);
+ if (dev->flags & IFF_PROMISC)
+ cfg |= GRETH_CTRL_PR;
+ else
+ cfg &= ~GRETH_CTRL_PR;
+
+ if (greth->multicast) {
+ if (dev->flags & IFF_ALLMULTI) {
+ GRETH_REGSAVE(regs->hash_msb, -1);
+ GRETH_REGSAVE(regs->hash_lsb, -1);
+ cfg |= GRETH_CTRL_MCEN;
+ GRETH_REGSAVE(regs->control, cfg);
+ return;
+ }
+
+ if (dev->mc_count == 0) {
+ cfg &= ~GRETH_CTRL_MCEN;
+ GRETH_REGSAVE(regs->control, cfg);
+ return;
+ }
+
+ /* Setup multicast filter */
+ greth_set_hash_filter(dev);
+ cfg |= GRETH_CTRL_MCEN;
+ }
+ GRETH_REGSAVE(regs->control, cfg);
+}
+
+static struct net_device_ops greth_netdev_ops = {
+ .ndo_open = greth_open,
+ .ndo_stop = greth_close,
+ .ndo_start_xmit = greth_start_xmit,
+ .ndo_set_mac_address = greth_set_mac_add,
+ .ndo_get_stats = greth_get_stats,
+};
+
+static struct net_device_ops greth_gbit_netdev_ops = {
+ .ndo_open = greth_open,
+ .ndo_stop = greth_close,
+ .ndo_start_xmit = greth_start_xmit_gbit,
+ .ndo_set_mac_address = greth_set_mac_add,
+ .ndo_get_stats = greth_get_stats,
+};
+
+/* Wait for a register change with a timeout, jiffies used has time reference */
+#define wait_loop(wait_statement, timeout, label_on_timeout, arg_on_timeout) \
+ { \
+ unsigned long _timeout = jiffies + HZ/100*timeout; \
+ while (wait_statement) { \
+ if (time_after(jiffies, _timeout)) { \
+ arg_on_timeout; \
+goto label_on_timeout; \
+ } \
+ } \
+ }
+
+static int greth_mdio_read(struct mii_bus *bus, int phy, int reg)
+{
+ struct greth_private *greth = bus->priv;
+ int data, err = 0;
+
+ wait_loop((GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_BUSY), 4, out, err = -EBUSY);
+
+ GRETH_REGSAVE(greth->regs->mdio, ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 2);
+
+ wait_loop((GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_BUSY), 4, out, err = -EBUSY);
+
+ if (!(GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_NVALID)) {
+ data = (GRETH_REGLOAD(greth->regs->mdio) >> 16) & 0xFFFF;
+ return data;
+
+ } else {
+ return -1;
+ }
+out:
+ return err;
+}
+
+
+static int greth_mdio_write(struct mii_bus *bus, int phy, int reg, u16 val)
+{
+ struct greth_private *greth = bus->priv;
+ int err = 0;
+
+ wait_loop((GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_BUSY), 4, out, err = -EBUSY);
+
+ GRETH_REGSAVE(greth->regs->mdio,
+ ((val & 0xFFFF) << 16) | ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 1);
+
+ wait_loop((GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_BUSY), 4, out, err = -EBUSY);
+
+ return 0;
+
+out:
+ return err;
+}
+
+static int greth_mdio_reset(struct mii_bus *bus)
+{
+ return 0;
+}
+
+static void greth_link_change(struct net_device *dev)
+{
+ struct greth_private *greth = netdev_priv(dev);
+ struct phy_device *phydev = greth->phy;
+ unsigned long flags;
+
+ int status_change = 0;
+
+ spin_lock_irqsave(&greth->devlock, flags);
+
+ if (phydev->link) {
+
+ if ((greth->speed != phydev->speed) || (greth->duplex != phydev->duplex)) {
+
+ GRETH_REGANDIN(greth->regs->control,
+ ~(GRETH_CTRL_FD | GRETH_CTRL_SP | GRETH_CTRL_GB));
+
+ if (phydev->duplex)
+ GRETH_REGORIN(greth->regs->control, GRETH_CTRL_FD);
+
+ if (phydev->speed == SPEED_100) {
+
+ GRETH_REGORIN(greth->regs->control, GRETH_CTRL_SP);
+ }
+
+ else if (phydev->speed == SPEED_1000)
+ GRETH_REGORIN(greth->regs->control, GRETH_CTRL_GB);
+
+ greth->speed = phydev->speed;
+ greth->duplex = phydev->duplex;
+ status_change = 1;
+ }
+ }
+
+ if (phydev->link != greth->link) {
+ if (!phydev->link) {
+ greth->speed = 0;
+ greth->duplex = -1;
+ }
+ greth->link = phydev->link;
+
+ status_change = 1;
+ }
+
+ spin_unlock_irqrestore(&greth->devlock, flags);
+
+ if (status_change) {
+ if (phydev->link)
+ pr_debug("%s: link up (%d/%s)\n",
+ dev->name, phydev->speed,
+ DUPLEX_FULL == phydev->duplex ? "Full" : "Half");
+ else
+ pr_debug("%s: link down\n", dev->name);
+ }
+}
+
+static int greth_mdio_probe(struct net_device *dev)
+{
+ struct greth_private *greth = netdev_priv(dev);
+ struct phy_device *phy = NULL;
+ u32 interface;
+ int i;
+
+ /* Find the first PHY */
+ for (i = 0; i < PHY_MAX_ADDR; i++) {
+ if (greth->mdio->phy_map[i]) {
+ phy = greth->mdio->phy_map[i];
+ break;
+ }
+ }
+ if (!phy) {
+ if (netif_msg_probe(greth))
+ dev_err(&dev->dev, "no PHY found\n");
+ return -ENXIO;
+ }
+
+ if (greth->gbit_mac)
+ interface = PHY_INTERFACE_MODE_GMII;
+ else
+ interface = PHY_INTERFACE_MODE_MII;
+
+ phy = phy_connect(dev, dev_name(&phy->dev), &greth_link_change, 0, interface);
+
+ if (greth->gbit_mac)
+ phy->supported &= PHY_GBIT_FEATURES;
+ else
+ phy->supported &= PHY_BASIC_FEATURES;
+
+ phy->advertising = phy->supported;
+
+ if (IS_ERR(phy)) {
+ if (netif_msg_ifup(greth))
+ dev_err(&dev->dev, "could not attach to PHY\n");
+ return PTR_ERR(phy);
+ }
+
+ greth->link = 0;
+ greth->speed = 0;
+ greth->duplex = -1;
+ greth->phy = phy;
+
+ return 0;
+}
+
+static inline int phy_aneg_done(struct phy_device *phydev)
+{
+ int retval;
+
+ retval = phy_read(phydev, MII_BMSR);
+
+ return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE);
+}
+
+static int greth_mdio_init(struct greth_private *greth)
+{
+ int ret, phy;
+ unsigned long timeout;
+
+ greth->mdio = mdiobus_alloc();
+ if (!greth->mdio) {
+ return -ENOMEM;
+ }
+
+ greth->mdio->name = "greth-mdio";
+ snprintf(greth->mdio->id, MII_BUS_ID_SIZE, "%s-%d", greth->mdio->name, greth->irq);
+ greth->mdio->read = greth_mdio_read;
+ greth->mdio->write = greth_mdio_write;
+ greth->mdio->reset = greth_mdio_reset;
+ greth->mdio->priv = greth;
+
+ greth->mdio->irq = greth->mdio_irqs;
+
+ for (phy = 0; phy < PHY_MAX_ADDR; phy++)
+ greth->mdio->irq[phy] = PHY_POLL;
+
+ ret = mdiobus_register(greth->mdio);
+ if (ret) {
+ goto error;
+ }
+
+ ret = greth_mdio_probe(greth->netdev);
+ if (ret) {
+ if (netif_msg_probe(greth))
+ dev_err(&greth->netdev->dev, "failed to probe MDIO bus\n");
+ goto unreg_mdio;
+ }
+
+ phy_start(greth->phy);
+
+ /* If we have Ethernet debug link make autoneg happen right away */
+ if (greth->edcl) {
+ phy_start_aneg(greth->phy);
+ timeout = jiffies + 6*HZ;
+ while (!phy_aneg_done(greth->phy) && time_before(jiffies, timeout)) {
+ }
+ genphy_read_status(greth->phy);
+ greth_link_change(greth->netdev);
+ }
+
+ return 0;
+
+unreg_mdio:
+ mdiobus_unregister(greth->mdio);
+error:
+ mdiobus_free(greth->mdio);
+ return ret;
+}
+
+/* Initialize the GRETH MAC */
+static int __devinit greth_of_probe(struct of_device *ofdev, const struct of_device_id *match)
+{
+ struct net_device *dev;
+ struct net_device_ops *ops;
+ struct greth_private *greth;
+ struct greth_regs *regs;
+
+ int i;
+ int err;
+ int tmp;
+ unsigned long timeout;
+
+ unsigned int *irqs;
+ int irq;
+ struct amba_prom_registers *prom_regs;
+ unsigned int addr;
+
+ irqs = (int *) of_get_property(ofdev->node, "interrupts", NULL);
+ prom_regs = (struct amba_prom_registers *) of_get_property(ofdev->node, "reg", NULL);
+ if (!irqs || !prom_regs)
+ return -ENODEV;
+
+ addr = prom_regs->phys_addr;
+ irq = *irqs;
+
+ dev = alloc_etherdev(sizeof(struct greth_private));
+
+ if (dev == NULL)
+ return -ENOMEM;
+
+ greth = netdev_priv(dev);
+ greth->netdev = dev;
+ greth->dev = &ofdev->dev;
+
+ if (greth_debug > 0)
+ greth->msg_enable = greth_debug;
+ else
+ greth->msg_enable = GRETH_DEF_MSG_ENABLE;
+
+ spin_lock_init(&greth->devlock);
+
+ if (!request_mem_region(addr, 0x100, "grlib-greth")) {
+ if (netif_msg_probe(greth))
+ dev_err(greth->dev, "Couldn't lock memory region at %x\n", addr);
+ err = -EBUSY;
+ goto error1;
+ }
+
+ greth->regs = (struct greth_regs *) ioremap(addr, sizeof(struct greth_regs));
+
+ if (greth->regs == NULL) {
+ if (netif_msg_probe(greth))
+ dev_err(greth->dev, "Ioremap failure.\n");
+ err = -EIO;
+ goto error2;
+ }
+
+ regs = (struct greth_regs *) greth->regs;
+ greth->irq = irq;
+
+ dev_set_drvdata(greth->dev, dev);
+ SET_NETDEV_DEV(dev, greth->dev);
+
+ /* Reset the controller. */
+ GRETH_REGSAVE(regs->control, GRETH_RESET);
+
+ /* Wait for MAC to reset itself */
+ timeout = jiffies + HZ/100;
+ while (GRETH_REGLOAD(regs->control) & GRETH_RESET) {
+ if (time_after(jiffies, timeout)) {
+ err = -EIO;
+ if (netif_msg_probe(greth))
+ dev_err(greth->dev, "timeout when waiting for reset.\n");
+ goto error3;
+ }
+ }
+
+ /* Get default PHY address */
+ greth->phyaddr = (GRETH_REGLOAD(regs->mdio) >> 11) & 0x1F;
+
+ /* Check if we have GBIT capable MAC */
+ tmp = GRETH_REGLOAD(regs->control);
+ greth->gbit_mac = (tmp >> 27) & 1;
+
+ /* Check for multicast capability */
+ greth->multicast = (tmp >> 25) & 1;
+
+ greth->edcl = (tmp >> 31) & 1;
+
+ /* If we have EDCL we disable the EDCL speed-duplex FSM so
+ * it doesn't interfere with the software */
+ if (greth->edcl != 0)
+ GRETH_REGORIN(regs->control, GRETH_CTRL_DISDUPLEX);
+
+ /* Check if MAC can handle MDIO interrupts */
+ greth->mdio_int_en = (tmp >> 26) & 1;
+
+ err = greth_mdio_init(greth);
+ if (err) {
+ if (netif_msg_probe(greth))
+ dev_err(greth->dev, "failed to register MDIO bus\n");
+ goto error3;
+ }
+
+ /* Allocate TX descriptor ring in coherent memory */
+ greth->tx_bd_base = (struct greth_bd *) dma_alloc_coherent(greth->dev,
+ 1024,
+ &greth->tx_bd_base_phys,
+ GFP_KERNEL);
+
+ if (!greth->tx_bd_base) {
+ if (netif_msg_probe(greth))
+ dev_err(&dev->dev, "could not allocate descriptor memory.\n");
+ err = -ENOMEM;
+ goto error4;
+ }
+
+ memset(greth->tx_bd_base, 0, 1024);
+
+ /* Allocate RX descriptor ring in coherent memory */
+ greth->rx_bd_base = (struct greth_bd *) dma_alloc_coherent(greth->dev,
+ 1024,
+ &greth->rx_bd_base_phys,
+ GFP_KERNEL);
+
+ if (!greth->rx_bd_base) {
+ if (netif_msg_probe(greth))
+ dev_err(greth->dev, "could not allocate descriptor memory.\n");
+ err = -ENOMEM;
+ goto error5;
+ }
+
+ memset(greth->rx_bd_base, 0, 1024);
+
+ /* Get MAC address from: module param, OF property or ID prom */
+ for (i = 0; i < 6; i++) {
+ if (macaddr[i] != 0)
+ break;
+ }
+ if (i == 6) {
+ const unsigned char *addr;
+ int len;
+ addr = of_get_property(ofdev->node, "local-mac-address", &len);
+ if (addr != NULL && len == 6) {
+ for (i = 0; i < 6; i++)
+ macaddr[i] = (unsigned int) addr[i];
+ } else {
+#ifdef CONFIG_SPARC
+ for (i = 0; i < 6; i++)
+ macaddr[i] = (unsigned int) idprom->id_ethaddr[i];
+#endif
+ }
+ }
+
+ for (i = 0; i < 6; i++)
+ dev->dev_addr[i] = macaddr[i];
+
+ macaddr[5]++;
+
+ if (!is_valid_ether_addr(&dev->dev_addr[0])) {
+ if (netif_msg_probe(greth))
+ dev_err(greth->dev, "no valid ethernet address, aborting.\n");
+ err = -EINVAL;
+ goto error6;
+ }
+
+ GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]);
+ GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 |
+ dev->dev_addr[4] << 8 | dev->dev_addr[5]);
+
+ /* Clear all pending interrupts except PHY irq */
+ GRETH_REGSAVE(regs->status, 0xFF);
+
+ dev->base_addr = (unsigned long) addr;
+
+ if (greth->gbit_mac) {
+ dev->features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_HIGHDMA;
+ ops = &greth_gbit_netdev_ops;
+ } else {
+ ops = &greth_netdev_ops;
+ }
+
+ if (greth->multicast) {
+ ops->ndo_set_multicast_list = greth_set_multicast_list;
+ dev->flags |= IFF_MULTICAST;
+ } else {
+ dev->flags &= ~IFF_MULTICAST;
+ }
+
+ dev->netdev_ops = ops;
+
+ if (register_netdev(dev)) {
+ if (netif_msg_probe(greth))
+ dev_err(greth->dev, "netdevice registration failed.\n");
+ err = -ENOMEM;
+ goto error6;
+ }
+
+ /* setup NAPI */
+ memset(&greth->napi, 0, sizeof(greth->napi));
+ netif_napi_add(dev, &greth->napi, greth_poll, 64);
+
+ return 0;
+
+error6:
+ dma_free_coherent(greth->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
+error5:
+ dma_free_coherent(greth->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
+error4:
+ mdiobus_unregister(greth->mdio);
+error3:
+ iounmap(greth->regs);
+error2:
+ release_mem_region(addr, 0x100);
+error1:
+ free_netdev(dev);
+ return err;
+}
+
+static int __devexit greth_of_remove(struct of_device *of_dev)
+{
+ struct net_device *ndev = dev_get_drvdata(&of_dev->dev);
+ struct greth_private *greth = netdev_priv(ndev);
+
+ /* Free descriptor areas */
+ dma_free_coherent(&of_dev->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
+
+ dma_free_coherent(&of_dev->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
+
+ release_mem_region(ndev->base_addr, 0x100);
+ dev_set_drvdata(&of_dev->dev, NULL);
+
+ if (greth->phy)
+ phy_stop(greth->phy);
+ mdiobus_unregister(greth->mdio);
+
+ unregister_netdev(ndev);
+ free_netdev(ndev);
+
+ iounmap(greth->regs);
+
+ return 0;
+}
+
+static struct of_device_id greth_of_match[] = {
+ {
+ .name = "GAISLER_ETHMAC",
+ },
+ {},
+};
+
+MODULE_DEVICE_TABLE(of, greth_of_match);
+
+static struct of_platform_driver greth_of_driver = {
+ .name = "grlib-greth",
+ .match_table = greth_of_match,
+ .probe = greth_of_probe,
+ .remove = __devexit_p(greth_of_remove),
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "grlib-greth",
+ },
+};
+
+static int __init greth_init(void)
+{
+ return of_register_platform_driver(&greth_of_driver);
+}
+
+static void __exit greth_cleanup(void)
+{
+ of_unregister_platform_driver(&greth_of_driver);
+}
+
+module_init(greth_init);
+module_exit(greth_cleanup);
+
+MODULE_AUTHOR("Aeroflex Gaisler AB.");
+MODULE_DESCRIPTION("Aeroflex Gaisler Ethernet MAC driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/net/greth.h b/drivers/net/greth.h
new file mode 100644
index 0000000..7e820de
--- /dev/null
+++ b/drivers/net/greth.h
@@ -0,0 +1,149 @@
+#ifndef GRETH_H
+#define GRETH_H
+
+#include <linux/phy.h>
+
+/* Register bits and masks */
+#define GRETH_RESET 0x40
+#define GRETH_MII_BUSY 0x8
+#define GRETH_MII_NVALID 0x10
+
+#define GRETH_CTRL_FD 0x10
+#define GRETH_CTRL_PR 0x20
+#define GRETH_CTRL_SP 0x80
+#define GRETH_CTRL_GB 0x100
+#define GRETH_CTRL_PSTATIEN 0x400
+#define GRETH_CTRL_MCEN 0x800
+#define GRETH_CTRL_DISDUPLEX 0x1000
+#define GRETH_STATUS_PHYSTAT 0x100
+
+#define GRETH_BD_EN 0x800
+#define GRETH_BD_WR 0x1000
+#define GRETH_BD_IE 0x2000
+#define GRETH_BD_LEN 0x7FF
+
+#define GRETH_TXEN 0x1
+#define GRETH_INT_TX 0x8
+#define GRETH_TXI 0x4
+#define GRETH_TXBD_STATUS 0x0001C000
+#define GRETH_TXBD_MORE 0x20000
+#define GRETH_TXBD_IPCS 0x40000
+#define GRETH_TXBD_TCPCS 0x80000
+#define GRETH_TXBD_UDPCS 0x100000
+#define GRETH_TXBD_CSALL (GRETH_TXBD_IPCS | GRETH_TXBD_TCPCS | GRETH_TXBD_UDPCS)
+#define GRETH_TXBD_ERR_LC 0x10000
+#define GRETH_TXBD_ERR_UE 0x4000
+#define GRETH_TXBD_ERR_AL 0x8000
+
+#define GRETH_INT_RX 0x4
+#define GRETH_RXEN 0x2
+#define GRETH_RXI 0x8
+#define GRETH_RXBD_STATUS 0xFFFFC000
+#define GRETH_RXBD_ERR_AE 0x4000
+#define GRETH_RXBD_ERR_FT 0x8000
+#define GRETH_RXBD_ERR_CRC 0x10000
+#define GRETH_RXBD_ERR_OE 0x20000
+#define GRETH_RXBD_ERR_LE 0x40000
+#define GRETH_RXBD_IP 0x80000
+#define GRETH_RXBD_IP_CSERR 0x100000
+#define GRETH_RXBD_UDP 0x200000
+#define GRETH_RXBD_UDP_CSERR 0x400000
+#define GRETH_RXBD_TCP 0x800000
+#define GRETH_RXBD_TCP_CSERR 0x1000000
+#define GRETH_RXBD_IP_FRAG 0x2000000
+#define GRETH_RXBD_MCAST 0x4000000
+
+/* Descriptor parameters */
+#define GRETH_TXBD_NUM 128
+#define GRETH_TXBD_NUM_MASK (GRETH_TXBD_NUM-1)
+#define GRETH_TX_BUF_SIZE 2048
+#define GRETH_RXBD_NUM 128
+#define GRETH_RXBD_NUM_MASK (GRETH_RXBD_NUM-1)
+#define GRETH_RX_BUF_SIZE 2048
+
+/* Buffers per page */
+#define GRETH_RX_BUF_PPGAE (PAGE_SIZE/GRETH_RX_BUF_SIZE)
+#define GRETH_TX_BUF_PPGAE (PAGE_SIZE/GRETH_TX_BUF_SIZE)
+
+/* How many pages are needed for buffers */
+#define GRETH_RX_BUF_PAGE_NUM (GRETH_RXBD_NUM/GRETH_RX_BUF_PPGAE)
+#define GRETH_TX_BUF_PAGE_NUM (GRETH_TXBD_NUM/GRETH_TX_BUF_PPGAE)
+
+/* Buffer size.
+ * Gbit MAC uses tagged maximum frame size which is 1518 excluding CRC.
+ * Set to 1520 to make all buffers word aligned for non-gbit MAC.
+ */
+#define MAX_FRAME_SIZE 1520
+
+
+/* GRETH APB registers */
+struct greth_regs {
+ u32 control;
+ u32 status;
+ u32 esa_msb;
+ u32 esa_lsb;
+ u32 mdio;
+ u32 tx_desc_p;
+ u32 rx_desc_p;
+ u32 edclip;
+ u32 hash_msb;
+ u32 hash_lsb;
+};
+
+/* GRETH buffer descriptor */
+struct greth_bd {
+ u32 stat;
+ u32 addr;
+};
+
+struct greth_private {
+ struct sk_buff *rx_skbuff[GRETH_RXBD_NUM];
+ struct sk_buff *tx_skbuff[GRETH_TXBD_NUM];
+
+ unsigned char *tx_bufs[GRETH_TXBD_NUM];
+ unsigned char *rx_bufs[GRETH_RXBD_NUM];
+
+ u16 tx_next;
+ u16 tx_last;
+ u16 tx_free;
+ u16 rx_cur;
+
+ u8 phyaddr;
+ u8 multicast;
+ u8 gbit_mac;
+ u8 mdio_int_en;
+ u8 edcl;
+
+ struct greth_regs *regs; /* Address of controller registers. */
+ struct greth_bd *rx_bd_base; /* Address of Rx BDs. */
+ struct greth_bd *tx_bd_base; /* Address of Tx BDs. */
+ dma_addr_t rx_bd_base_phys;
+ dma_addr_t tx_bd_base_phys;
+
+ int irq;
+
+ struct device *dev; /* Pointer to of_device->dev */
+ struct net_device *netdev;
+ struct napi_struct napi;
+ struct net_device_stats stats;
+ spinlock_t devlock;
+
+ struct work_struct greth_wq;
+
+ struct phy_device *phy;
+ struct mii_bus *mdio;
+ int mdio_irqs[PHY_MAX_ADDR];
+ unsigned int link;
+ unsigned int speed;
+ unsigned int duplex;
+
+ uint32_t msg_enable;
+};
+
+
+struct amba_prom_registers {
+ unsigned int phys_addr;
+ unsigned int reg_size;
+};
+
+#endif
--
1.6.4.1
--
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