[PATCH v2] net: Add MOXA ART SoCs ethernet driver
Jonas Jensen
jonas.jensen at gmail.com
Fri Jul 26 08:48:10 EDT 2013
The MOXA UC-711X hardware(s) has an ethernet controller that seem to be
developed internally. The IC used is "RTL8201CP".
Since there is no public documentation, this driver is mostly the one
published by MOXA that has been heavily cleaned up / ported from linux 2.6.9.
Signed-off-by: Jonas Jensen <jonas.jensen at gmail.com>
---
Notes:
According to issues pointed out by Florian:
One more thing is now known about the controller:
It requires descriptors to be located in continuous memory.
.. which is why the driver allocates buffers with kmalloc,
and memory is reused in RX path to build new skb:s (build_skb),
before giving packet to stack.
Changes since v1:
1. use NAPI RX polling
2. preallocate SKBs / use build_skb
3. increment stats only on success
4. return NETDEV_TX_BUSY on TX ring busy
5. use dma_map_single / set descriptors (no memcpy)
6. free skb:s, unmap DMA on transfer complete
7. general code cleanup
Applies to next-20130726
.../devicetree/bindings/net/moxa,moxart-mac.txt | 25 +
drivers/net/ethernet/Kconfig | 1 +
drivers/net/ethernet/Makefile | 1 +
drivers/net/ethernet/moxa/Kconfig | 30 ++
drivers/net/ethernet/moxa/Makefile | 7 +
drivers/net/ethernet/moxa/moxart_ether.c | 586 +++++++++++++++++++++
drivers/net/ethernet/moxa/moxart_ether.h | 513 ++++++++++++++++++
7 files changed, 1163 insertions(+)
create mode 100644 Documentation/devicetree/bindings/net/moxa,moxart-mac.txt
create mode 100644 drivers/net/ethernet/moxa/Kconfig
create mode 100644 drivers/net/ethernet/moxa/Makefile
create mode 100644 drivers/net/ethernet/moxa/moxart_ether.c
create mode 100644 drivers/net/ethernet/moxa/moxart_ether.h
diff --git a/Documentation/devicetree/bindings/net/moxa,moxart-mac.txt b/Documentation/devicetree/bindings/net/moxa,moxart-mac.txt
new file mode 100644
index 0000000..1fc44ff
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/moxa,moxart-mac.txt
@@ -0,0 +1,25 @@
+MOXA ART Ethernet Controller
+
+Required properties:
+
+- compatible : Must be "moxa,moxart-mac"
+- reg : Should contain registers location and length
+ index 0 : main register
+ index 1 : mac address (stored on flash)
+- interrupts : Should contain the mac interrupt number
+
+Example:
+
+ mac0: mac at 90900000 {
+ compatible = "moxa,moxart-mac";
+ reg = <0x90900000 0x100>,
+ <0x80000050 0x6>;
+ interrupts = <25 0>;
+ };
+
+ mac1: mac at 92000000 {
+ compatible = "moxa,moxart-mac";
+ reg = <0x92000000 0x100>,
+ <0x80000056 0x6>;
+ interrupts = <27 0>;
+ };
diff --git a/drivers/net/ethernet/Kconfig b/drivers/net/ethernet/Kconfig
index 2037080..506b024 100644
--- a/drivers/net/ethernet/Kconfig
+++ b/drivers/net/ethernet/Kconfig
@@ -90,6 +90,7 @@ source "drivers/net/ethernet/marvell/Kconfig"
source "drivers/net/ethernet/mellanox/Kconfig"
source "drivers/net/ethernet/micrel/Kconfig"
source "drivers/net/ethernet/microchip/Kconfig"
+source "drivers/net/ethernet/moxa/Kconfig"
source "drivers/net/ethernet/myricom/Kconfig"
config FEALNX
diff --git a/drivers/net/ethernet/Makefile b/drivers/net/ethernet/Makefile
index 390bd0b..c0b8789 100644
--- a/drivers/net/ethernet/Makefile
+++ b/drivers/net/ethernet/Makefile
@@ -42,6 +42,7 @@ obj-$(CONFIG_NET_VENDOR_MARVELL) += marvell/
obj-$(CONFIG_NET_VENDOR_MELLANOX) += mellanox/
obj-$(CONFIG_NET_VENDOR_MICREL) += micrel/
obj-$(CONFIG_NET_VENDOR_MICROCHIP) += microchip/
+obj-$(CONFIG_NET_VENDOR_MOXART) += moxa/
obj-$(CONFIG_NET_VENDOR_MYRI) += myricom/
obj-$(CONFIG_FEALNX) += fealnx.o
obj-$(CONFIG_NET_VENDOR_NATSEMI) += natsemi/
diff --git a/drivers/net/ethernet/moxa/Kconfig b/drivers/net/ethernet/moxa/Kconfig
new file mode 100644
index 0000000..1731e05
--- /dev/null
+++ b/drivers/net/ethernet/moxa/Kconfig
@@ -0,0 +1,30 @@
+#
+# MOXART device configuration
+#
+
+config NET_VENDOR_MOXART
+ bool "MOXA ART devices"
+ default y
+ depends on (ARM && ARCH_MOXART)
+ ---help---
+ If you have a network (Ethernet) card belonging to this class, say Y
+ and read the Ethernet-HOWTO, available from
+ <http://www.tldp.org/docs.html#howto>.
+
+ Note that the answer to this question doesn't directly affect the
+ kernel: saying N will just cause the configurator to skip all
+ the questions about MOXA ART devices. If you say Y, you will be asked
+ for your specific card in the following questions.
+
+if NET_VENDOR_MOXART
+
+config ARM_MOXART_ETHER
+ tristate "MOXART Ethernet support"
+ depends on ARM && ARCH_MOXART
+ select NET_CORE
+ ---help---
+ If you wish to compile a kernel for a hardware with MOXA ART SoC and
+ want to use the internal ethernet then you should answer Y to this.
+
+
+endif # NET_VENDOR_MOXART
diff --git a/drivers/net/ethernet/moxa/Makefile b/drivers/net/ethernet/moxa/Makefile
new file mode 100644
index 0000000..e182981
--- /dev/null
+++ b/drivers/net/ethernet/moxa/Makefile
@@ -0,0 +1,7 @@
+#
+# Makefile for the MOXART network device drivers.
+#
+
+obj-$(CONFIG_ARM_MOXART_ETHER) += moxart_ether.o
+
+CFLAGS_moxart_ether.o := -DDEBUG
diff --git a/drivers/net/ethernet/moxa/moxart_ether.c b/drivers/net/ethernet/moxa/moxart_ether.c
new file mode 100644
index 0000000..af73c9c
--- /dev/null
+++ b/drivers/net/ethernet/moxa/moxart_ether.c
@@ -0,0 +1,586 @@
+/* MOXA ART Ethernet (RTL8201CP) driver.
+ *
+ * Copyright (C) 2013 Jonas Jensen
+ *
+ * Jonas Jensen <jonas.jensen at gmail.com>
+ *
+ * Based on code from
+ * Moxa Technology Co., Ltd. <www.moxa.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/dma-mapping.h>
+#include <linux/ethtool.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/crc32.h>
+#include <linux/crc32c.h>
+#include <linux/dma-mapping.h>
+
+#include "moxart_ether.h"
+
+static inline unsigned long moxart_emac_read(struct net_device *ndev,
+ unsigned int reg)
+{
+ struct moxart_mac_priv_t *priv = netdev_priv(ndev);
+
+ return readl(priv->base + reg);
+}
+
+static inline void moxart_emac_write(struct net_device *ndev,
+ unsigned int reg, unsigned long value)
+{
+ struct moxart_mac_priv_t *priv = netdev_priv(ndev);
+
+ writel(value, priv->base + reg);
+}
+
+static void moxart_update_mac_address(struct net_device *ndev)
+{
+ moxart_emac_write(ndev, MAC_MADR_REG_OFFSET,
+ ((ndev->dev_addr[0] << 8) | (ndev->dev_addr[1])));
+ moxart_emac_write(ndev, MAC_MADR_REG_OFFSET + 4,
+ ((ndev->dev_addr[2] << 24) |
+ (ndev->dev_addr[3] << 16) |
+ (ndev->dev_addr[4] << 8) |
+ (ndev->dev_addr[5])));
+}
+
+static int moxart_set_mac_address(struct net_device *ndev, void *addr)
+{
+ struct sockaddr *address = addr;
+
+ if (!is_valid_ether_addr(address->sa_data))
+ return -EADDRNOTAVAIL;
+
+ memcpy(ndev->dev_addr, address->sa_data, ndev->addr_len);
+ moxart_update_mac_address(ndev);
+
+ return 0;
+}
+
+static void moxart_mac_free_memory(struct net_device *ndev)
+{
+ struct moxart_mac_priv_t *priv = netdev_priv(ndev);
+ int i;
+
+ for (i = 0; i < RX_DESC_NUM; i++)
+ dma_unmap_single(&ndev->dev, priv->rx_mapping[i],
+ priv->rx_buf_size, DMA_FROM_DEVICE);
+
+ if (priv->tx_desc_base)
+ dma_free_coherent(NULL, sizeof(struct tx_desc_t)*TX_DESC_NUM,
+ priv->tx_desc_base, priv->tx_base);
+ if (priv->rx_desc_base)
+ dma_free_coherent(NULL, sizeof(struct rx_desc_t)*RX_DESC_NUM,
+ priv->rx_desc_base, priv->rx_base);
+
+ kfree(priv->tx_buf_base);
+ kfree(priv->rx_buf_base);
+}
+
+static void moxart_mac_reset(struct net_device *ndev)
+{
+ struct moxart_mac_priv_t *priv = netdev_priv(ndev);
+
+ writel(SW_RST, priv->base + MACCR_REG_OFFSET);
+ while (readl(priv->base + MACCR_REG_OFFSET) & SW_RST)
+ mdelay(10);
+
+ writel(0, priv->base + IMR_REG_OFFSET);
+
+ priv->reg_maccr = RX_BROADPKT | FULLDUP | CRC_APD | RX_FTL;
+}
+
+static void moxart_mac_enable(struct net_device *ndev)
+{
+ struct moxart_mac_priv_t *priv = netdev_priv(ndev);
+
+ writel(0x00001010, priv->base + ITC_REG_OFFSET);
+ writel(0x00000001, priv->base + APTC_REG_OFFSET);
+ writel(0x00000390, priv->base + DBLAC_REG_OFFSET);
+
+ priv->reg_imr |= (RPKT_FINISH_M | XPKT_FINISH_M);
+ writel(priv->reg_imr, priv->base + IMR_REG_OFFSET);
+
+ priv->reg_maccr |= (RCV_EN | XMT_EN | RDMA_EN | XDMA_EN);
+ writel(priv->reg_maccr, priv->base + MACCR_REG_OFFSET);
+}
+
+static void moxart_mac_setup_desc_ring(struct net_device *ndev)
+{
+ struct moxart_mac_priv_t *priv = netdev_priv(ndev);
+ struct tx_desc_t *txdesc;
+ struct rx_desc_t *rxdesc;
+ int i;
+
+ for (i = 0; i < TX_DESC_NUM; i++) {
+ txdesc = &priv->tx_desc_base[i];
+ memset(txdesc, 0, sizeof(struct tx_desc_t));
+
+ priv->tx_buf[i] = priv->tx_buf_base + priv->tx_buf_size * i;
+ }
+ priv->tx_desc_base[TX_DESC_NUM - 1].txdes1.ubit.edotr = 1;
+ priv->tx_head = 0;
+ priv->tx_tail = 0;
+
+ for (i = 0; i < RX_DESC_NUM; i++) {
+ rxdesc = &priv->rx_desc_base[i];
+ memset(rxdesc, 0, sizeof(struct rx_desc_t));
+ rxdesc->rxdes0.ubit.rx_dma_own = 1;
+ rxdesc->rxdes1.ubit.rx_buf_size = RX_BUF_SIZE;
+
+ priv->rx_buf[i] = priv->rx_buf_base + priv->rx_buf_size * i;
+ priv->rx_mapping[i] = dma_map_single(&ndev->dev,
+ priv->rx_buf[i],
+ priv->rx_buf_size,
+ DMA_FROM_DEVICE);
+ if (dma_mapping_error(&ndev->dev, priv->rx_mapping[i]))
+ netdev_err(ndev, "DMA mapping error\n");
+
+ rxdesc->rxdes2.addr_phys = priv->rx_mapping[i];
+ rxdesc->rxdes2.addr_virt = priv->rx_buf[i];
+ }
+ priv->rx_desc_base[RX_DESC_NUM - 1].rxdes1.ubit.edorr = 1;
+ priv->rx_head = 0;
+
+ /* reset the MAC controler TX/RX desciptor base address */
+ writel(priv->tx_base, priv->base + TXR_BADR_REG_OFFSET);
+ writel(priv->rx_base, priv->base + RXR_BADR_REG_OFFSET);
+}
+
+static int moxart_mac_open(struct net_device *ndev)
+{
+ struct moxart_mac_priv_t *priv = netdev_priv(ndev);
+
+ if (!is_valid_ether_addr(ndev->dev_addr))
+ return -EADDRNOTAVAIL;
+
+ napi_enable(&priv->napi);
+
+ moxart_mac_reset(ndev);
+ moxart_update_mac_address(ndev);
+ moxart_mac_setup_desc_ring(ndev);
+ moxart_mac_enable(ndev);
+ netif_start_queue(ndev);
+
+ netdev_dbg(ndev, "%s: IMR=0x%x, MACCR=0x%x\n",
+ __func__, readl(priv->base + IMR_REG_OFFSET),
+ readl(priv->base + MACCR_REG_OFFSET));
+
+ return 0;
+}
+
+static int moxart_mac_stop(struct net_device *ndev)
+{
+ struct moxart_mac_priv_t *priv = netdev_priv(ndev);
+
+ napi_disable(&priv->napi);
+
+ netif_stop_queue(ndev);
+
+ /* disable all interrupts */
+ writel(0, priv->base + IMR_REG_OFFSET);
+
+ /* disable all functions */
+ writel(0, priv->base + MACCR_REG_OFFSET);
+
+ return 0;
+}
+
+static int moxart_rx_poll(struct napi_struct *napi, int budget)
+{
+ struct moxart_mac_priv_t *priv = container_of(napi,
+ struct moxart_mac_priv_t,
+ napi);
+ struct net_device *ndev = priv->ndev;
+ struct rx_desc_t *rxdesc;
+ struct sk_buff *skb;
+ unsigned int ui, len;
+ int rx_head = priv->rx_head;
+ int rx = 0;
+
+ while (1) {
+ rxdesc = &priv->rx_desc_base[rx_head];
+ ui = rxdesc->rxdes0.ui;
+
+ if (ui & RXDMA_OWN)
+ break;
+
+ if (ui & (RX_ERR | CRC_ERR | FTL | RUNT | RX_ODD_NB)) {
+ netdev_err(ndev, "packet error\n");
+ priv->stats.rx_dropped++;
+ priv->stats.rx_errors++;
+ continue;
+ }
+
+ len = ui & RFL_MASK;
+
+ if (len > RX_BUF_SIZE)
+ len = RX_BUF_SIZE;
+
+ skb = build_skb(priv->rx_buf[rx_head], priv->rx_buf_size);
+ if (unlikely(!skb)) {
+ netdev_err(ndev, "build_skb failed\n");
+ priv->stats.rx_dropped++;
+ }
+
+ skb_put(skb, len);
+ skb->protocol = eth_type_trans(skb, ndev);
+ napi_gro_receive(&priv->napi, skb);
+ rx++;
+
+ ndev->last_rx = jiffies;
+ priv->stats.rx_packets++;
+ priv->stats.rx_bytes += len;
+ if (ui & MULTICAST_RXDES0)
+ priv->stats.multicast++;
+
+ rxdesc->rxdes0.ui = RXDMA_OWN;
+
+ rx_head = RX_NEXT(rx_head);
+ priv->rx_head = rx_head;
+
+ if (rx >= budget)
+ break;
+ }
+
+ if (rx < budget) {
+ napi_gro_flush(napi, false);
+ __napi_complete(napi);
+ }
+
+ priv->reg_imr |= RPKT_FINISH_M;
+ writel(priv->reg_imr, priv->base + IMR_REG_OFFSET);
+
+ return rx;
+}
+
+static void moxart_tx_finished(struct net_device *ndev)
+{
+ struct moxart_mac_priv_t *priv = netdev_priv(ndev);
+ unsigned tx_head = priv->tx_head;
+ unsigned tx_tail = priv->tx_tail;
+
+ while (tx_tail != tx_head) {
+ dma_unmap_single(&ndev->dev, priv->tx_mapping[tx_tail],
+ priv->tx_len[tx_tail], DMA_TO_DEVICE);
+ dev_kfree_skb_irq(priv->tx_skb[tx_tail]);
+
+ priv->stats.tx_packets++;
+ priv->stats.tx_bytes += priv->tx_skb[tx_tail]->len;
+
+ priv->tx_skb[tx_tail] = NULL;
+
+ tx_tail = TX_NEXT(tx_tail);
+ }
+ priv->tx_tail = tx_tail;
+}
+
+static irqreturn_t moxart_mac_interrupt(int irq, void *dev_id)
+{
+ struct net_device *ndev = (struct net_device *) dev_id;
+ struct moxart_mac_priv_t *priv = netdev_priv(ndev);
+ unsigned int ists = readl(priv->base + ISR_REG_OFFSET);
+
+ if (ists & XPKT_OK_INT_STS)
+ moxart_tx_finished(ndev);
+
+ if (ists & RPKT_FINISH) {
+ if (napi_schedule_prep(&priv->napi)) {
+ priv->reg_imr &= ~RPKT_FINISH_M;
+ writel(priv->reg_imr, priv->base + IMR_REG_OFFSET);
+ __napi_schedule(&priv->napi);
+ }
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int moxart_mac_start_xmit(struct sk_buff *skb, struct net_device *ndev)
+{
+ struct moxart_mac_priv_t *priv = netdev_priv(ndev);
+ struct tx_desc_t *txdesc;
+ unsigned int len;
+ unsigned int tx_head = priv->tx_head;
+
+ spin_lock_irq(&priv->txlock);
+
+ txdesc = &priv->tx_desc_base[tx_head];
+
+ if (txdesc->txdes0.ubit.tx_dma_own) {
+ netdev_err(ndev, "no TX space for packet\n");
+ priv->stats.tx_dropped++;
+ return NETDEV_TX_BUSY;
+ }
+
+ len = skb->len > TX_BUF_SIZE ? TX_BUF_SIZE : skb->len;
+
+ priv->tx_mapping[tx_head] = dma_map_single(&ndev->dev, skb->data,
+ len, DMA_TO_DEVICE);
+ if (dma_mapping_error(&ndev->dev, priv->tx_mapping[tx_head])) {
+ netdev_err(ndev, "DMA mapping error\n");
+ return NETDEV_TX_BUSY;
+ }
+
+ priv->tx_len[tx_head] = len;
+ priv->tx_skb[tx_head] = skb;
+
+ txdesc->txdes2.addr_phys = priv->tx_mapping[tx_head];
+ txdesc->txdes2.addr_virt = skb->data;
+
+ if (skb->len < ETH_ZLEN) {
+ memset(&txdesc->txdes2.addr_virt[skb->len],
+ 0, ETH_ZLEN - skb->len);
+ len = ETH_ZLEN;
+ }
+
+ txdesc->txdes1.ubit.lts = 1;
+ txdesc->txdes1.ubit.fts = 1;
+ txdesc->txdes1.ubit.tx2_fic = 0;
+ txdesc->txdes1.ubit.tx_ic = 0;
+ txdesc->txdes1.ubit.tx_buf_size = len;
+ txdesc->txdes0.ui = TXDMA_OWN;
+
+ /* start to send packet */
+ writel(0xffffffff, priv->base + TXPD_REG_OFFSET);
+
+ priv->tx_head = TX_NEXT(tx_head);
+
+ ndev->trans_start = jiffies;
+
+ spin_unlock_irq(&priv->txlock);
+
+ return NETDEV_TX_OK;
+}
+
+static struct net_device_stats *moxart_mac_get_stats(struct net_device *ndev)
+{
+ struct moxart_mac_priv_t *priv = netdev_priv(ndev);
+
+ return &priv->stats;
+}
+
+static void moxart_mac_setmulticast(struct net_device *ndev)
+{
+ struct moxart_mac_priv_t *priv = netdev_priv(ndev);
+ struct netdev_hw_addr *ha;
+ int crc_val;
+
+ netdev_for_each_mc_addr(ha, ndev) {
+ crc_val = crc32_le(~0, ha->addr, ETH_ALEN);
+ crc_val = (crc_val >> 26) & 0x3f;
+ if (crc_val >= 32) {
+ writel(readl(priv->base + MATH1_REG_OFFSET) |
+ (1UL << (crc_val - 32)),
+ priv->base + MATH1_REG_OFFSET);
+ } else {
+ writel(readl(priv->base + MATH0_REG_OFFSET) |
+ (1UL << crc_val),
+ priv->base + MATH0_REG_OFFSET);
+ }
+ }
+}
+
+static void moxart_mac_set_rx_mode(struct net_device *ndev)
+{
+ struct moxart_mac_priv_t *priv = netdev_priv(ndev);
+
+ spin_lock_irq(&priv->txlock);
+
+ (ndev->flags & IFF_PROMISC) ? (priv->reg_maccr |= RCV_ALL) :
+ (priv->reg_maccr &= ~RCV_ALL);
+
+ (ndev->flags & IFF_ALLMULTI) ? (priv->reg_maccr |= RX_MULTIPKT) :
+ (priv->reg_maccr &= ~RX_MULTIPKT);
+
+ if ((ndev->flags & IFF_MULTICAST) && netdev_mc_count(ndev)) {
+ priv->reg_maccr |= HT_MULTI_EN;
+ moxart_mac_setmulticast(ndev);
+ } else {
+ priv->reg_maccr &= ~HT_MULTI_EN;
+ }
+
+ writel(priv->reg_maccr, priv->base + MACCR_REG_OFFSET);
+
+ spin_unlock_irq(&priv->txlock);
+}
+
+static struct net_device_ops moxart_netdev_ops = {
+ .ndo_open = moxart_mac_open,
+ .ndo_stop = moxart_mac_stop,
+ .ndo_start_xmit = moxart_mac_start_xmit,
+ .ndo_get_stats = moxart_mac_get_stats,
+ .ndo_set_rx_mode = moxart_mac_set_rx_mode,
+ .ndo_set_mac_address = moxart_set_mac_address,
+ .ndo_validate_addr = eth_validate_addr,
+ .ndo_change_mtu = eth_change_mtu,
+};
+
+static void moxart_get_mac_address(struct net_device *ndev)
+{
+ struct moxart_mac_priv_t *priv = netdev_priv(ndev);
+ int i;
+
+ for (i = 0; i <= 5; i++)
+ ndev->dev_addr[i] = readb(priv->flash_base + i);
+}
+
+static int moxart_mac_probe(struct platform_device *pdev)
+{
+ struct device *p_dev = &pdev->dev;
+ struct device_node *node = p_dev->of_node;
+ struct net_device *ndev;
+ struct moxart_mac_priv_t *priv;
+ struct resource *res;
+ unsigned int irq;
+ void *tmp;
+
+ ndev = alloc_etherdev(sizeof(struct moxart_mac_priv_t));
+ if (!ndev)
+ return -ENOMEM;
+
+ irq = irq_of_parse_and_map(node, 0);
+
+ priv = netdev_priv(ndev);
+ priv->ndev = ndev;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ ndev->base_addr = res->start;
+ priv->base = devm_ioremap_resource(p_dev, res);
+ if (IS_ERR(priv->base)) {
+ dev_err(p_dev, "devm_ioremap_resource failed\n");
+ goto init_fail;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+
+ /* the flash driver (physmap_of) requests the same region
+ * so use ioremap instead of devm_ioremap_resource
+ */
+ priv->flash_base = ioremap(res->start, resource_size(res));
+ if (IS_ERR(priv->flash_base)) {
+ dev_err(p_dev, "devm_ioremap_resource failed\n");
+ goto init_fail;
+ }
+
+ spin_lock_init(&priv->txlock);
+
+ priv->tx_buf_size = TX_BUF_SIZE;
+ priv->rx_buf_size = RX_BUF_SIZE +
+ SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
+
+ tmp = dma_alloc_coherent(NULL, sizeof(struct tx_desc_t) * TX_DESC_NUM,
+ &priv->tx_base, GFP_DMA | GFP_KERNEL);
+ priv->tx_desc_base = (struct tx_desc_t *) tmp;
+ if (priv->tx_desc_base == NULL) {
+ netdev_err(ndev, "TX descriptor alloc failed\n");
+ goto init_fail;
+ }
+
+ tmp = dma_alloc_coherent(NULL, sizeof(struct rx_desc_t) * RX_DESC_NUM,
+ &priv->rx_base, GFP_DMA | GFP_KERNEL);
+ priv->rx_desc_base = (struct rx_desc_t *) tmp;
+ if (priv->rx_desc_base == NULL) {
+ netdev_err(ndev, "RX descriptor alloc failed\n");
+ goto init_fail;
+ }
+
+ priv->tx_buf_base = kmalloc(priv->tx_buf_size * TX_DESC_NUM,
+ GFP_ATOMIC);
+ if (!priv->tx_buf_base) {
+ netdev_err(ndev, "TX buffer alloc failed\n");
+ goto init_fail;
+ }
+
+ priv->rx_buf_base = kmalloc(priv->rx_buf_size * RX_DESC_NUM,
+ GFP_ATOMIC);
+ if (!priv->rx_buf_base) {
+ netdev_err(ndev, "RX buffer alloc failed\n");
+ goto init_fail;
+ }
+
+ platform_set_drvdata(pdev, ndev);
+
+ ether_setup(ndev);
+ ndev->netdev_ops = &moxart_netdev_ops;
+ netif_napi_add(ndev, &priv->napi, moxart_rx_poll, RX_DESC_NUM);
+ ndev->priv_flags |= IFF_UNICAST_FLT;
+
+ SET_NETDEV_DEV(ndev, &pdev->dev);
+
+ moxart_get_mac_address(ndev);
+ moxart_update_mac_address(ndev);
+
+ if (register_netdev(ndev)) {
+ free_netdev(ndev);
+ goto init_fail;
+ }
+
+ ndev->irq = irq;
+
+ if (devm_request_irq(p_dev, irq, moxart_mac_interrupt, 0,
+ pdev->name, ndev)) {
+ netdev_err(ndev, "devm_request_irq failed\n");
+ free_netdev(ndev);
+ return -EBUSY;
+ }
+
+ netdev_dbg(ndev, "%s: IRQ=%d address=%02x:%02x:%02x:%02x:%02x:%02x\n",
+ __func__, ndev->irq,
+ ndev->dev_addr[0], ndev->dev_addr[1], ndev->dev_addr[2],
+ ndev->dev_addr[3], ndev->dev_addr[4], ndev->dev_addr[5]);
+
+ return 0;
+
+init_fail:
+ netdev_err(ndev, "%s: init failed\n", __func__);
+ moxart_mac_free_memory(ndev);
+
+ return -ENOMEM;
+}
+
+static int moxart_remove(struct platform_device *pdev)
+{
+ struct net_device *ndev = platform_get_drvdata(pdev);
+
+ unregister_netdev(ndev);
+ free_irq(ndev->irq, ndev);
+ moxart_mac_free_memory(ndev);
+ platform_set_drvdata(pdev, NULL);
+ free_netdev(ndev);
+
+ return 0;
+}
+
+static const struct of_device_id moxart_mac_match[] = {
+ { .compatible = "moxa,moxart-mac" },
+ { }
+};
+
+struct __initdata platform_driver moxart_mac_driver = {
+ .probe = moxart_mac_probe,
+ .remove = moxart_remove,
+ .driver = {
+ .name = "moxart-ethernet",
+ .owner = THIS_MODULE,
+ .of_match_table = moxart_mac_match,
+ },
+};
+module_platform_driver(moxart_mac_driver);
+
+MODULE_DESCRIPTION("MOXART RTL8201CP Ethernet driver");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Jonas Jensen <jonas.jensen at gmail.com>");
+
diff --git a/drivers/net/ethernet/moxa/moxart_ether.h b/drivers/net/ethernet/moxa/moxart_ether.h
new file mode 100644
index 0000000..790b6a9
--- /dev/null
+++ b/drivers/net/ethernet/moxa/moxart_ether.h
@@ -0,0 +1,513 @@
+/* MOXA ART Ethernet (RTL8201CP) driver.
+ *
+ * Copyright (C) 2013 Jonas Jensen
+ *
+ * Jonas Jensen <jonas.jensen at gmail.com>
+ *
+ * Based on code from
+ * Moxa Technology Co., Ltd. <www.moxa.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#ifndef _MOXART_ETHERNET_H
+#define _MOXART_ETHERNET_H
+
+#define TX_DESC_NUM 64
+#define TX_DESC_NUM_MASK (TX_DESC_NUM-1)
+#define TX_NEXT(N) (((N) + 1) & (TX_DESC_NUM_MASK))
+#define TX_BUF_SIZE 1600
+
+#define RX_DESC_NUM 64
+#define RX_DESC_NUM_MASK (RX_DESC_NUM-1)
+#define RX_NEXT(N) (((N) + 1) & (RX_DESC_NUM_MASK))
+#define RX_BUF_SIZE 1600
+
+struct tx_desc_t {
+ union {
+#define TXDMA_OWN BIT(31)
+#define TXPKT_EXSCOL BIT(1)
+#define TXPKT_LATECOL BIT(0)
+ unsigned int ui;
+
+ struct {
+ /* is aborted due to late collision */
+ unsigned int tx_pkt_late_col:1;
+
+ /* is aborted after 16 collisions */
+ unsigned int rx_pkt_exs_col:1;
+
+ unsigned int reserved1:29;
+
+ /* is owned by the MAC controller */
+ unsigned int tx_dma_own:1;
+ } ubit;
+ } txdes0;
+
+ union {
+#define EDOTR BIT(31)
+#define TXIC BIT(30)
+#define TX2FIC BIT(29)
+#define FTS BIT(28)
+#define LTS BIT(27)
+#define TXBUF_SIZE_MASK 0x7ff
+#define TXBUF_SIZE_MAX (TXBUF_SIZE_MASK+1)
+ unsigned int ui;
+
+ struct {
+ /* transmit buffer size in byte */
+ unsigned int tx_buf_size:11;
+
+ unsigned int reserved2:16;
+
+ /* is the last descriptor of a Tx packet */
+ unsigned int lts:1;
+
+ /* is the first descriptor of a Tx packet */
+ unsigned int fts:1;
+
+ /* transmit to FIFO interrupt on completion */
+ unsigned int tx2_fic:1;
+
+ /* transmit interrupt on completion */
+ unsigned int tx_ic:1;
+
+ /* end descriptor of transmit ring */
+ unsigned int edotr:1;
+ } ubit;
+ } txdes1;
+
+ struct {
+ /* transmit buffer physical base address */
+ unsigned int addr_phys;
+
+ /* transmit buffer virtual base address */
+ unsigned char *addr_virt;
+ } txdes2;
+};
+
+struct rx_desc_t {
+ union {
+#define RXDMA_OWN BIT(31)
+#define FRS BIT(29)
+#define LRS BIT(28)
+#define RX_ODD_NB BIT(22)
+#define RUNT BIT(21)
+#define FTL BIT(20)
+#define CRC_ERR BIT(19)
+#define RX_ERR BIT(18)
+#define BROADCAST_RXDES0 BIT(17)
+#define MULTICAST_RXDES0 BIT(16)
+#define RFL_MASK 0x7ff
+#define RFL_MAX (RFL_MASK+1)
+ unsigned int ui;
+
+ struct {
+ /* receive frame length */
+ unsigned int recv_frame_len:11;
+ unsigned int reserved1:5;
+
+ /* multicast frame */
+ unsigned int multicast:1;
+
+ /* broadcast frame */
+ unsigned int broadcast:1;
+ unsigned int rx_err:1; /* receive error */
+ unsigned int crc_err:1; /* CRC error */
+ unsigned int ftl:1; /* frame too long */
+
+ /* runt packet, less than 64 bytes */
+ unsigned int runt:1;
+
+ /* receive odd nibbles */
+ unsigned int rx_odd_nb:1;
+ unsigned int reserved2:5;
+
+ /* last receive segment descriptor */
+ unsigned int lrs:1;
+
+ /* first receive segment descriptor */
+ unsigned int frs:1;
+
+ unsigned int reserved3:1;
+ unsigned int rx_dma_own:1; /* RXDMA onwership */
+ } ubit;
+ } rxdes0;
+
+ union {
+#define EDORR BIT(31)
+#define RXBUF_SIZE_MASK 0x7ff
+#define RXBUF_SIZE_MAX (RXBUF_SIZE_MASK+1)
+ unsigned int ui;
+
+ struct {
+ /* receive buffer size */
+ unsigned int rx_buf_size:11;
+
+ unsigned int reserved4:20;
+
+ /* end descriptor of receive ring */
+ unsigned int edorr:1;
+ } ubit;
+ } rxdes1;
+
+ struct {
+ /* receive buffer physical base address */
+ unsigned int addr_phys;
+
+ /* receive buffer virtual base address */
+ unsigned char *addr_virt;
+ } rxdes2;
+};
+
+struct mac_control_reg_t {
+
+/* RXDMA has received packets into RX buffer successfully */
+#define RPKT_FINISH BIT(0)
+/* receive buffer unavailable */
+#define NORXBUF BIT(1)
+/* TXDMA has moved data into the TX FIFO */
+#define XPKT_FINISH BIT(2)
+/* transmit buffer unavailable */
+#define NOTXBUF BIT(3)
+/* packets transmitted to ethernet successfully */
+#define XPKT_OK_INT_STS BIT(4)
+/* packets transmitted to ethernet lost due to late
+ * collision or excessive collision
+ */
+#define XPKT_LOST_INT_STS BIT(5)
+/* packets received into RX FIFO successfully */
+#define RPKT_SAV BIT(6)
+/* received packet lost due to RX FIFO full */
+#define RPKT_LOST_INT_STS BIT(7)
+#define AHB_ERR BIT(8) /* AHB error */
+#define PHYSTS_CHG BIT(9) /* PHY link status change */
+ unsigned int isr; /* interrupt status, 0x0 */
+
+#define RPKT_FINISH_M BIT(0) /* interrupt mask of ISR[0] */
+#define NORXBUF_M BIT(1) /* interrupt mask of ISR[1] */
+#define XPKT_FINISH_M BIT(2) /* interrupt mask of ISR[2] */
+#define NOTXBUF_M BIT(3) /* interrupt mask of ISR[3] */
+#define XPKT_OK_M BIT(4) /* interrupt mask of ISR[4] */
+#define XPKT_LOST_M BIT(5) /* interrupt mask of ISR[5] */
+#define RPKT_SAV_M BIT(6) /* interrupt mask of ISR[6] */
+#define RPKT_LOST_M BIT(7) /* interrupt mask of ISR[7] */
+#define AHB_ERR_M BIT(8) /* interrupt mask of ISR[8] */
+#define PHYSTS_CHG_M BIT(9) /* interrupt mask of ISR[9] */
+ unsigned int imr; /* interrupt mask, 0x4 */
+
+/* the most significant 2 bytes of MAC address */
+#define MAC_MADR_MASK 0xffff
+ /* MAC most significant address, 0x8 */
+ unsigned int mac_madr;
+
+ /* MAC least significant address, 0xc */
+ unsigned int mac_ldar;
+
+ /* multicast address hash table 0, 0x10 */
+ unsigned int matht0;
+
+ /* multicast address hash table 1, 0x14 */
+ unsigned int matht1;
+
+ /* transmit poll demand, 0x18 */
+ unsigned int txpd;
+
+ /* receive poll demand, 0x1c */
+ unsigned int rxpd;
+
+ /* transmit ring base address, 0x20 */
+ unsigned int txr_badr;
+
+ /* receive ring base address, 0x24 */
+ unsigned int rxr_badr;
+
+/* defines the period of TX cycle time */
+#define TXINT_TIME_SEL BIT(15)
+#define TXINT_THR_MASK 0x7000
+#define TXINT_CNT_MASK 0xf00
+/* defines the period of RX cycle time */
+#define RXINT_TIME_SEL BIT(7)
+#define RXINT_THR_MASK 0x70
+#define RXINT_CNT_MASK 0xF
+ /* interrupt timer control, 0x28 */
+ unsigned int itc;
+
+/* defines the period of TX poll time */
+#define TXPOLL_TIME_SEL BIT(12)
+#define TXPOLL_CNT_MASK 0xf00
+#define TXPOLL_CNT_SHIFT_BIT 8
+/* defines the period of RX poll time */
+#define RXPOLL_TIME_SEL BIT(4)
+#define RXPOLL_CNT_MASK 0xF
+#define RXPOLL_CNT_SHIFT_BIT 0
+ /* automatic polling timer control, 0x2c */
+ unsigned int aptc;
+
+/* enable RX FIFO threshold arbitration */
+#define RX_THR_EN BIT(9)
+#define RXFIFO_HTHR_MASK 0x1c0
+#define RXFIFO_LTHR_MASK 0x38
+/* use INCR16 burst command in AHB bus */
+#define INCR16_EN BIT(2)
+/* use INCR8 burst command in AHB bus */
+#define INCR8_EN BIT(1)
+/* use INCR4 burst command in AHB bus */
+#define INCR4_EN BIT(0)
+ /* DMA burst length and arbitration control, 0x30 */
+ unsigned int dblac;
+
+ unsigned int reserved1[21]; /* 0x34 - 0x84 */
+
+#define RX_BROADPKT BIT(17) /* receive boradcast packet */
+/* receive all multicast packet */
+#define RX_MULTIPKT BIT(16)
+#define FULLDUP BIT(15) /* full duplex */
+/* append CRC to transmitted packet */
+#define CRC_APD BIT(14)
+/* do not check incoming packet's destination address */
+#define RCV_ALL BIT(12)
+/* store incoming packet even if its length is great than 1518 bytes */
+#define RX_FTL BIT(11)
+/* store incoming packet even if its length is less than 64 bytes */
+#define RX_RUNT BIT(10)
+/* enable storing incoming packet if the packet passes hash table
+ * address filtering and is a multicast packet
+ */
+#define HT_MULTI_EN BIT(9)
+#define RCV_EN BIT(8) /* receiver enable */
+/* enable packet reception when transmitting packet in half duplex mode */
+#define ENRX_IN_HALFTX BIT(6)
+#define XMT_EN BIT(5) /* transmitter enable */
+/* disable CRC check when receiving packets */
+#define CRC_DIS BIT(4)
+#define LOOP_EN BIT(3) /* internal loop-back */
+/* software reset, last 64 AHB bus clocks */
+#define SW_RST BIT(2)
+#define RDMA_EN BIT(1) /* enable receive DMA chan */
+#define XDMA_EN BIT(0) /* enable transmit DMA chan */
+ unsigned int maccr; /* MAC control, 0x88 */
+
+#define COL_EXCEED BIT(11) /* collisions exceeds 16 */
+/* transmitter detects late collision */
+#define LATE_COL BIT(10)
+/* packet transmitted to ethernet lost due to late collision
+ * or excessive collision
+ */
+#define XPKT_LOST BIT(9)
+/* packets transmitted to ethernet successfully */
+#define XPKT_OK BIT(8)
+/* receiver detects a runt packet */
+#define RUNT_MAC_STS BIT(7)
+/* receiver detects a frame that is too long */
+#define FTL_MAC_STS BIT(6)
+#define CRC_ERR_MAC_STS BIT(5)
+/* received packets list due to RX FIFO full */
+#define RPKT_LOST BIT(4)
+/* packets received into RX FIFO successfully */
+#define RPKT_SAVE BIT(3)
+/* incoming packet dropped due to collision */
+#define COL BIT(2)
+#define MCPU_BROADCAST BIT(1)
+#define MCPU_MULTICAST BIT(0)
+ unsigned int macsr; /* MAC status, 0x8c */
+
+/* initialize a write sequence to PHY by setting this bit to 1
+ * this bit would be auto cleared after the write operation is finished.
+ */
+#define MIIWR BIT(27)
+#define MIIRD BIT(26)
+#define REGAD_MASK 0x3e00000
+#define PHYAD_MASK 0x1f0000
+#define MIIRDATA_MASK 0xffff
+ unsigned int phycr; /* PHY control, 0x90 */
+
+#define MIIWDATA_MASK 0xffff
+ unsigned int phywdata; /* PHY write data, 0x94 */
+
+#define PAUSE_TIME_MASK 0xffff0000
+#define FC_HIGH_MASK 0xf000
+#define FC_LOW_MASK 0xf00
+#define RX_PAUSE BIT(4) /* receive pause frame */
+/* packet transmission is paused due to receive */
+#define TXPAUSED BIT(3)
+ /* pause frame */
+/* enable flow control threshold mode. */
+#define FCTHR_EN BIT(2)
+#define TX_PAUSE BIT(1) /* transmit pause frame */
+#define FC_EN BIT(0) /* flow control mode enable */
+ unsigned int fcr; /* flow control, 0x98 */
+
+#define BK_LOW_MASK 0xf00
+#define BKJAM_LEN_MASK 0xf0
+#define BK_MODE BIT(1) /* back pressure address mode */
+#define BK_EN BIT(0) /* back pressure mode enable */
+ unsigned int bpr; /* back pressure, 0x9c */
+
+ unsigned int reserved2[9]; /* 0xa0 - 0xc0 */
+
+#define TEST_SEED_MASK 0x3fff
+ unsigned int ts; /* test seed, 0xc4 */
+
+#define TXD_REQ BIT(31) /* TXDMA request */
+#define RXD_REQ BIT(30) /* RXDMA request */
+#define DARB_TXGNT BIT(29) /* TXDMA grant */
+#define DARB_RXGNT BIT(28) /* RXDMA grant */
+#define TXFIFO_EMPTY BIT(27) /* TX FIFO is empty */
+#define RXFIFO_EMPTY BIT(26) /* RX FIFO is empty */
+#define TXDMA2_SM_MASK 0x7000
+#define TXDMA1_SM_MASK 0xf00
+#define RXDMA2_SM_MASK 0x70
+#define RXDMA1_SM_MASK 0xF
+ unsigned int dmafifos; /* DMA/FIFO state, 0xc8 */
+
+#define SINGLE_PKT BIT(26) /* single packet mode */
+/* automatic polling timer test mode */
+#define PTIMER_TEST BIT(25)
+#define ITIMER_TEST BIT(24) /* interrupt timer test mode */
+#define TEST_SEED_SEL BIT(22) /* test seed select */
+#define SEED_SEL BIT(21) /* seed select */
+#define TEST_MODE BIT(20) /* transmission test mode */
+#define TEST_TIME_MASK 0xffc00
+#define TEST_EXCEL_MASK 0x3e0
+ unsigned int tm; /* test mode, 0xcc */
+
+ unsigned int reserved3; /* 0xd0 */
+
+#define TX_MCOL_MASK 0xffff0000
+#define TX_MCOL_SHIFT_BIT 16
+#define TX_SCOL_MASK 0xffff
+#define TX_SCOL_SHIFT_BIT 0
+ /* TX_MCOL and TX_SCOL counter, 0xd4 */
+ unsigned int txmcol_xscol;
+
+#define RPF_MASK 0xffff0000
+#define RPF_SHIFT_BIT 16
+#define AEP_MASK 0xffff
+#define AEP_SHIFT_BIT 0
+ unsigned int rpf_aep; /* RPF and AEP counter, 0xd8 */
+
+#define XM_MASK 0xffff0000
+#define XM_SHIFT_BIT 16
+#define PG_MASK 0xffff
+#define PG_SHIFT_BIT 0
+ unsigned int xm_pg; /* XM and PG counter, 0xdc */
+
+#define RUNT_CNT_MASK 0xffff0000
+#define RUNT_CNT_SHIFT_BIT 16
+#define TLCC_MASK 0xffff
+#define TLCC_SHIFT_BIT 0
+ /* RUNT_CNT and TLCC counter, 0xe0 */
+ unsigned int runtcnt_tlcc;
+
+#define CRCER_CNT_MASK 0xffff0000
+#define CRCER_CNT_SHIFT_BIT 16
+#define FTL_CNT_MASK 0xffff
+#define FTL_CNT_SHIFT_BIT 0
+ /* CRCER_CNT and FTL_CNT counter, 0xe4 */
+ unsigned int crcercnt_ftlcnt;
+
+#define RLC_MASK 0xffff0000
+#define RLC_SHIFT_BIT 16
+#define RCC_MASK 0xffff
+#define RCC_SHIFT_BIT 0
+ unsigned int rlc_rcc; /* RLC and RCC counter, 0xe8 */
+
+ unsigned int broc; /* BROC counter, 0xec */
+ unsigned int mulca; /* MULCA counter, 0xf0 */
+ unsigned int rp; /* RP counter, 0xf4 */
+ unsigned int xp; /* XP counter, 0xf8 */
+};
+
+#define ISR_REG_OFFSET 0x0
+#define IMR_REG_OFFSET 0x4
+#define MAC_MADR_REG_OFFSET 0x8
+#define MAC_LADR_REG_OFFSET 0xC
+#define MATH0_REG_OFFSET 0x10
+#define MATH1_REG_OFFSET 0x14
+#define TXPD_REG_OFFSET 0x18
+#define RXPD_REG_OFFSET 0x1C
+#define TXR_BADR_REG_OFFSET 0x20
+#define RXR_BADR_REG_OFFSET 0x24
+#define ITC_REG_OFFSET 0x28
+#define APTC_REG_OFFSET 0x2C
+#define DBLAC_REG_OFFSET 0x30
+#define MACCR_REG_OFFSET 0x88
+#define MACSR_REG_OFFSET 0x8C
+#define PHYCR_REG_OFFSET 0x90
+#define PHYWDATA_REG_OFFSET 0x94
+#define FCR_REG_OFFSET 0x98
+#define BPR_REG_OFFSET 0x9C
+#define TS_REG_OFFSET 0xC4
+#define DMAFIFOS_REG_OFFSET 0xC8
+#define TM_REG_OFFSET 0xCC
+#define TX_MCOL_TX_SCOL_REG_OFFSET 0xD4
+#define RPF_AEP_REG_OFFSET 0xD8
+#define XM_PG_REG_OFFSET 0xDC
+#define RUNT_CNT_TLCC_REG_OFFSET 0xE0
+#define CRCER_CNT_FTL_CNT_REG_OFFSET 0xE4
+#define RLC_RCC_REG_OFFSET 0xE8
+#define BROC_REG_OFFSET 0xEC
+#define MULCA_REG_OFFSET 0xF0
+#define RP_REG_OFFSET 0xF4
+#define XP_REG_OFFSET 0xF8
+#define PHY_CNTL_REG 0x0
+#define PHY_STATUS_REG 0x1
+#define PHY_ID_REG1 0x2
+#define PHY_ID_REG2 0x3
+#define PHY_ANA_REG 0x4
+#define PHY_ANLPAR_REG 0x5
+#define PHY_ANE_REG 0x6
+#define PHY_ECNTL_REG1 0x10
+#define PHY_QPDS_REG 0x11
+#define PHY_10BOP_REG 0x12
+#define PHY_ECNTL_REG2 0x13
+#define FTMAC100_REG_PHY_WRITE 0x8000000
+#define FTMAC100_REG_PHY_READ 0x4000000
+
+/* PHY Status register */
+#define AN_COMPLETE 0x20
+
+#define LINK_STATUS 0x4
+
+struct moxart_mac_priv_t {
+ void __iomem *base;
+ void __iomem *flash_base;
+ struct net_device_stats stats;
+ unsigned int reg_maccr;
+ unsigned int reg_imr;
+ struct napi_struct napi;
+ struct net_device *ndev;
+
+ dma_addr_t rx_base;
+ dma_addr_t rx_mapping[RX_DESC_NUM];
+ struct rx_desc_t *rx_desc_base;
+ unsigned char *rx_buf_base;
+ unsigned char *rx_buf[RX_DESC_NUM];
+ unsigned int rx_head;
+ unsigned int rx_buf_size;
+
+ dma_addr_t tx_base;
+ dma_addr_t tx_mapping[TX_DESC_NUM];
+ struct tx_desc_t *tx_desc_base;
+ unsigned char *tx_buf_base;
+ unsigned char *tx_buf[RX_DESC_NUM];
+ unsigned int tx_head;
+ unsigned int tx_buf_size;
+
+ spinlock_t txlock;
+ unsigned int tx_len[TX_DESC_NUM];
+ struct sk_buff *tx_skb[TX_DESC_NUM];
+ unsigned int tx_tail;
+};
+
+#if TX_BUF_SIZE >= TXBUF_SIZE_MAX
+#error MOXA ART Ethernet device driver Tx buffer size too large !
+#endif
+#if RX_BUF_SIZE >= RXBUF_SIZE_MAX
+#error MOXA ART Ethernet device driver Rx buffer size too large !
+#endif
+
+#endif
--
1.8.2.1
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