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Message-ID: <1434011629-31257-1-git-send-email-noamc@ezchip.com>
Date: Thu, 11 Jun 2015 11:33:49 +0300
From: Noam Camus <noamc@...hip.com>
To: <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC: <Alexey.Brodkin@...opsys.com>, <vgupta@...opsys.com>,
<giladb@...hip.com>, <cmetcalf@...hip.com>,
Tal Zilcer <talz@...hip.com>, Noam Camus <noamc@...hip.com>
Subject: [PATCH v2] NET: Add ezchip ethernet driver
From: Tal Zilcer <talz@...hip.com>
Simple LAN device without multicast support.
Device performance is not high and may be used for
debug or management purposes.
Device supports interrupts for RX and TX end.
Device does not support NAPI and also does not support DMA.
It is used in EZchip NPS devices.
Signed-off-by: Noam Camus <noamc@...hip.com>
Signed-off-by: Tal Zilcer <talz@...hip.com>
Acked-by: Alexey Brodkin <abrodkin@...opsys.com>
---
.../devicetree/bindings/net/ezchip_enet.txt | 15 +
drivers/net/ethernet/Kconfig | 1 +
drivers/net/ethernet/Makefile | 1 +
drivers/net/ethernet/ezchip/Kconfig | 29 +
drivers/net/ethernet/ezchip/Makefile | 1 +
drivers/net/ethernet/ezchip/nps_enet.c | 597 ++++++++++++++++++++
drivers/net/ethernet/ezchip/nps_enet.h | 311 ++++++++++
7 files changed, 955 insertions(+), 0 deletions(-)
create mode 100644 Documentation/devicetree/bindings/net/ezchip_enet.txt
create mode 100644 drivers/net/ethernet/ezchip/Kconfig
create mode 100644 drivers/net/ethernet/ezchip/Makefile
create mode 100644 drivers/net/ethernet/ezchip/nps_enet.c
create mode 100644 drivers/net/ethernet/ezchip/nps_enet.h
diff --git a/Documentation/devicetree/bindings/net/ezchip_enet.txt b/Documentation/devicetree/bindings/net/ezchip_enet.txt
new file mode 100644
index 0000000..d2bf9ab
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/ezchip_enet.txt
@@ -0,0 +1,15 @@
+* EZchip NPS ENET 10/100 Ethernet driver (ENET)
+
+Required properties:
+- compatible: Should be "ezchip,nps-enet"
+- reg: Address and length of the register set for the device
+- interrupts: Should contain the ENET interrupt
+
+Examples:
+
+ ethernet@...03000 {
+ compatible = "ezchip,nps-enet";
+ reg = <0xf0003000 0x44>;
+ interrupts = <7>;
+ mac-address = [ 00 11 22 33 44 55 ];
+ };
diff --git a/drivers/net/ethernet/Kconfig b/drivers/net/ethernet/Kconfig
index eadcb05..1a6b1ba 100644
--- a/drivers/net/ethernet/Kconfig
+++ b/drivers/net/ethernet/Kconfig
@@ -66,6 +66,7 @@ config DNET
source "drivers/net/ethernet/dec/Kconfig"
source "drivers/net/ethernet/dlink/Kconfig"
source "drivers/net/ethernet/emulex/Kconfig"
+source "drivers/net/ethernet/ezchip/Kconfig"
source "drivers/net/ethernet/neterion/Kconfig"
source "drivers/net/ethernet/faraday/Kconfig"
source "drivers/net/ethernet/freescale/Kconfig"
diff --git a/drivers/net/ethernet/Makefile b/drivers/net/ethernet/Makefile
index 1367afc..489f9cc 100644
--- a/drivers/net/ethernet/Makefile
+++ b/drivers/net/ethernet/Makefile
@@ -29,6 +29,7 @@ obj-$(CONFIG_DNET) += dnet.o
obj-$(CONFIG_NET_VENDOR_DEC) += dec/
obj-$(CONFIG_NET_VENDOR_DLINK) += dlink/
obj-$(CONFIG_NET_VENDOR_EMULEX) += emulex/
+obj-$(CONFIG_NET_VENDOR_EZCHIP) += ezchip/
obj-$(CONFIG_NET_VENDOR_EXAR) += neterion/
obj-$(CONFIG_NET_VENDOR_FARADAY) += faraday/
obj-$(CONFIG_NET_VENDOR_FREESCALE) += freescale/
diff --git a/drivers/net/ethernet/ezchip/Kconfig b/drivers/net/ethernet/ezchip/Kconfig
new file mode 100644
index 0000000..e830d2e
--- /dev/null
+++ b/drivers/net/ethernet/ezchip/Kconfig
@@ -0,0 +1,29 @@
+#
+# EZchip network device configuration
+#
+
+config NET_VENDOR_EZCHIP
+ bool "EZchip devices"
+ default y
+ ---help---
+ If you have a network (Ethernet) device 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 EZchip devices. If you say Y, you will be asked for
+ your specific device in the following questions.
+
+if NET_VENDOR_EZCHIP
+
+config EZCHIP_NPS_LAN
+ tristate "EZchip NPS LAN support"
+ ---help---
+ Simple LAN device without multicast support.
+ Device performance is not high and may be used for
+ debug or management purposes.
+ Device supports interrupts for RX and TX(end).
+ Device does not support NAPI and also does not support DMA.
+
+endif
diff --git a/drivers/net/ethernet/ezchip/Makefile b/drivers/net/ethernet/ezchip/Makefile
new file mode 100644
index 0000000..806e13d
--- /dev/null
+++ b/drivers/net/ethernet/ezchip/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_EZCHIP_NPS_LAN) += nps_enet.o
diff --git a/drivers/net/ethernet/ezchip/nps_enet.c b/drivers/net/ethernet/ezchip/nps_enet.c
new file mode 100644
index 0000000..00f115a
--- /dev/null
+++ b/drivers/net/ethernet/ezchip/nps_enet.c
@@ -0,0 +1,597 @@
+/*
+ * Copyright(c) 2015 EZchip Technologies.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.
+ *
+ * The full GNU General Public License is included in this distribution in
+ * the file called "COPYING".
+ */
+
+#include <linux/module.h>
+#include <linux/etherdevice.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/of_net.h>
+#include <linux/of_platform.h>
+#include "nps_enet.h"
+
+#define DRV_NAME "nps_enet"
+
+#define NPS_ENET_INT_MASK (sizeof(u32) - 1)
+#define NPS_ENET_INT_OFFSET 2
+#define NPS_ENET_WORDS_NUM(length) ((length + NPS_ENET_INT_MASK) >> 2)
+
+static void nps_enet_clean_rx_fifo(struct net_device *netdev, s32 frame_len)
+{
+ struct nps_enet_priv *net_priv = netdev_priv(netdev);
+ s32 i, len = NPS_ENET_WORDS_NUM(frame_len);
+
+ /* Empty Rx FIFO buffer by reading all words */
+ for (i = 0; i < len; i++)
+ nps_enet_reg_get(net_priv, NPS_ENET_REG_RX_BUF);
+}
+
+static void nps_enet_read_rx_fifo(struct net_device *netdev,
+ unsigned char *dst, s32 length)
+{
+ struct nps_enet_priv *net_priv = netdev_priv(netdev);
+ s32 i, len = length >> NPS_ENET_INT_OFFSET;
+ s32 last = length & NPS_ENET_INT_MASK;
+ u32 *reg = (u32 *)dst;
+ bool dst_is_aligned = !((u32)dst & NPS_ENET_INT_MASK);
+
+ /* In case dst is not aligned we need an intermediate buffer */
+ if (dst_is_aligned)
+ for (i = 0; i < len; i++, reg++)
+ *reg = nps_enet_reg_get(net_priv, NPS_ENET_REG_RX_BUF);
+ else { /* !dst_is_aligned */
+ for (i = 0; i < len; i++, reg++) {
+ u32 buf =
+ nps_enet_reg_get(net_priv, NPS_ENET_REG_RX_BUF);
+
+ /* to accommodate word-unaligned address of "reg"
+ * we have to do memcpy() instead of simple "="
+ */
+ memcpy(reg, &buf, sizeof(buf));
+ }
+ }
+
+ /* copy last bytes (if any) */
+ if (last) {
+ u32 buf = nps_enet_reg_get(net_priv, NPS_ENET_REG_RX_BUF);
+
+ memcpy(reg, &buf, last);
+ }
+}
+
+static void nps_enet_rx_irq_handler(struct net_device *netdev,
+ struct nps_enet_rx_ctl rx_ctrl)
+{
+ struct nps_enet_priv *net_priv = netdev_priv(netdev);
+ struct sk_buff *skb;
+ s32 frame_len = rx_ctrl.nr, err = 0 ;
+
+ /* Check Rx error */
+ if (rx_ctrl.er) {
+ netdev->stats.rx_errors++;
+ err = 1;
+ }
+
+ /* Check Rx CRC error */
+ if (rx_ctrl.crc) {
+ netdev->stats.rx_crc_errors++;
+ netdev->stats.rx_dropped++;
+ err = 1;
+ }
+
+ /* Check Frame length Min 64b */
+ if (unlikely(frame_len < ETH_ZLEN)) {
+ netdev->stats.rx_length_errors++;
+ netdev->stats.rx_dropped++;
+ err = 1;
+ }
+
+ if (err)
+ goto rx_irq_clean;
+
+ /* Skb allocation */
+ skb = netdev_alloc_skb_ip_align(netdev, frame_len);
+ if (unlikely(!skb)) {
+ netdev->stats.rx_errors++;
+ netdev->stats.rx_dropped++;
+ goto rx_irq_clean;
+ }
+
+ /* Copy frame from Rx fifo into the skb */
+ nps_enet_read_rx_fifo(netdev, skb->data, frame_len);
+
+ skb_put(skb, frame_len);
+ skb->dev = netdev;
+ skb->protocol = eth_type_trans(skb, netdev);
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+
+ netdev->stats.rx_packets++;
+ netdev->stats.rx_bytes += frame_len;
+
+ netif_rx(skb);
+ goto rx_irq_frame_done;
+
+rx_irq_clean:
+ /* Clean Rx fifo */
+ nps_enet_clean_rx_fifo(netdev, frame_len);
+
+rx_irq_frame_done:
+ /* Ack Rx ctrl register */
+ nps_enet_reg_set(net_priv, NPS_ENET_REG_RX_CTL, 0);
+}
+
+static void nps_enet_tx_irq_handler(struct net_device *netdev,
+ struct nps_enet_tx_ctl tx_ctrl)
+{
+ struct nps_enet_priv *net_priv = netdev_priv(netdev);
+
+ /* Check Tx transmit error */
+ if (unlikely(tx_ctrl.et)) {
+ netdev->stats.tx_errors++;
+ } else {
+ netdev->stats.tx_packets++;
+ netdev->stats.tx_bytes += tx_ctrl.nt;
+ }
+
+ /* Ack Tx ctrl register */
+ nps_enet_reg_set(net_priv, NPS_ENET_REG_TX_CTL, 0);
+
+ /* In nps_enet_start_xmit we disabled sending frames*/
+ netif_wake_queue(netdev);
+}
+
+/**
+ * nps_enet_irq_handler - Global interrupt handler for ENET.
+ * @irq: irq number.
+ * @dev_instance: device instance.
+ *
+ * returns: IRQ_HANDLED for all cases.
+ *
+ * EZchip ENET has 2 interrupt causes, and depending on bits raised in
+ * CTRL register we may tell what is a reason for interrupt to fire.
+ * We got one for RX and the other for TX (end).
+ */
+static irqreturn_t nps_enet_irq_handler(s32 irq, void *dev_instance)
+{
+ struct net_device *netdev = dev_instance;
+ struct nps_enet_priv *net_priv = netdev_priv(netdev);
+ struct nps_enet_rx_ctl rx_ctrl;
+ struct nps_enet_tx_ctl tx_ctrl;
+
+ /* Check for Rx ready */
+ rx_ctrl.value = nps_enet_reg_get(net_priv, NPS_ENET_REG_RX_CTL);
+ if (rx_ctrl.cr)
+ nps_enet_rx_irq_handler(netdev, rx_ctrl);
+
+ /* Check for Tx done */
+ tx_ctrl.value = nps_enet_reg_get(net_priv, NPS_ENET_REG_TX_CTL);
+ if (net_priv->tx_packet_sent && !tx_ctrl.ct) {
+ nps_enet_tx_irq_handler(netdev, tx_ctrl);
+ net_priv->tx_packet_sent = false;
+ }
+
+ return IRQ_HANDLED;
+}
+
+static void nps_enet_set_hw_mac_address(struct net_device *netdev)
+{
+ struct nps_enet_priv *net_priv = netdev_priv(netdev);
+ struct nps_enet_ge_mac_cfg_1 ge_mac_cfg_1;
+ struct nps_enet_ge_mac_cfg_2 *ge_mac_cfg_2 = &net_priv->ge_mac_cfg_2;
+
+ /* set MAC address in HW */
+ ge_mac_cfg_1.octet_0 = netdev->dev_addr[0];
+ ge_mac_cfg_1.octet_1 = netdev->dev_addr[1];
+ ge_mac_cfg_1.octet_2 = netdev->dev_addr[2];
+ ge_mac_cfg_1.octet_3 = netdev->dev_addr[3];
+ ge_mac_cfg_2->octet_4 = netdev->dev_addr[4];
+ ge_mac_cfg_2->octet_5 = netdev->dev_addr[5];
+
+ nps_enet_reg_set(net_priv, NPS_ENET_REG_GE_MAC_CFG_1,
+ ge_mac_cfg_1.value);
+
+ nps_enet_reg_set(net_priv, NPS_ENET_REG_GE_MAC_CFG_2,
+ ge_mac_cfg_2->value);
+}
+
+/**
+ * nps_enet_hw_reset - Reset the network device.
+ * @ndev: Pointer to the network device.
+ *
+ * This function reset the PCS and TX fifo.
+ * The programming model is to set the relevant reset bits
+ * wait for some time for this to propagate and then unset
+ * the reset bits. This way we ensure that reset procedure
+ * is done successfully by device.
+ */
+static void nps_enet_hw_reset(struct net_device *ndev)
+{
+ struct nps_enet_priv *net_priv = netdev_priv(ndev);
+ struct nps_enet_ge_rst ge_rst = {.value = 0};
+ struct nps_enet_phase_fifo_ctl phase_fifo_ctl = {.value = 0};
+
+ /* Pcs reset sequence*/
+ ge_rst.gmac_0 = NPS_ENET_ENABLE;
+ nps_enet_reg_set(net_priv, NPS_ENET_REG_GE_RST, ge_rst.value);
+ usleep_range(10, 20);
+ ge_rst.value = 0;
+ nps_enet_reg_set(net_priv, NPS_ENET_REG_GE_RST, ge_rst.value);
+
+ /* Tx fifo reset sequence */
+ phase_fifo_ctl.rst = NPS_ENET_ENABLE;
+ phase_fifo_ctl.init = NPS_ENET_ENABLE;
+ nps_enet_reg_set(net_priv, NPS_ENET_REG_PHASE_FIFO_CTL,
+ phase_fifo_ctl.value);
+ usleep_range(10, 20);
+ phase_fifo_ctl.value = 0;
+ nps_enet_reg_set(net_priv, NPS_ENET_REG_PHASE_FIFO_CTL,
+ phase_fifo_ctl.value);
+}
+
+static void nps_enet_hw_enable_control(struct net_device *netdev)
+{
+ struct nps_enet_priv *net_priv = netdev_priv(netdev);
+ struct nps_enet_ge_mac_cfg_0 ge_mac_cfg_0 = { .value = 0 };
+ struct nps_enet_buf_int_enable buf_int_enable = { .value = 0 };
+ struct nps_enet_ge_mac_cfg_2 *ge_mac_cfg_2 = &net_priv->ge_mac_cfg_2;
+ struct nps_enet_ge_mac_cfg_3 *ge_mac_cfg_3 = &net_priv->ge_mac_cfg_3;
+ s32 max_frame_length;
+
+ /* Enable Rx and Tx statistics */
+ ge_mac_cfg_2->stat_en = NPS_ENET_GE_MAC_CFG_2_STAT_EN;
+
+ /* Discard packets with different MAC address */
+ ge_mac_cfg_2->disc_da = NPS_ENET_ENABLE;
+
+ /* Discard multicast packets */
+ ge_mac_cfg_2->disc_mc = NPS_ENET_ENABLE;
+
+ nps_enet_reg_set(net_priv, NPS_ENET_REG_GE_MAC_CFG_2,
+ ge_mac_cfg_2->value);
+
+ /* Discard Packets bigger than max frame length */
+ max_frame_length = ETH_HLEN + netdev->mtu + ETH_FCS_LEN;
+ if (max_frame_length <= NPS_ENET_MAX_FRAME_LENGTH) {
+ ge_mac_cfg_3->max_len = max_frame_length;
+ nps_enet_reg_set(net_priv, NPS_ENET_REG_GE_MAC_CFG_3,
+ ge_mac_cfg_3->value);
+ }
+
+ /* Enable interrupts */
+ buf_int_enable.rx_rdy = NPS_ENET_ENABLE;
+ buf_int_enable.tx_done = NPS_ENET_ENABLE;
+ nps_enet_reg_set(net_priv, NPS_ENET_REG_BUF_INT_ENABLE,
+ buf_int_enable.value);
+
+ /* Write device MAC address to HW */
+ nps_enet_set_hw_mac_address(netdev);
+
+ /* Rx and Tx HW features */
+ ge_mac_cfg_0.tx_pad_en = NPS_ENET_ENABLE;
+ ge_mac_cfg_0.tx_crc_en = NPS_ENET_ENABLE;
+ ge_mac_cfg_0.rx_crc_strip = NPS_ENET_ENABLE;
+
+ /* IFG configuration */
+ ge_mac_cfg_0.rx_ifg = NPS_ENET_GE_MAC_CFG_0_RX_IFG;
+ ge_mac_cfg_0.tx_ifg = NPS_ENET_GE_MAC_CFG_0_TX_IFG;
+
+ /* preamble configuration */
+ ge_mac_cfg_0.rx_pr_check_en = NPS_ENET_ENABLE;
+ ge_mac_cfg_0.tx_pr_len = NPS_ENET_GE_MAC_CFG_0_TX_PR_LEN;
+
+ /* enable flow control frames */
+ ge_mac_cfg_0.tx_fc_en = NPS_ENET_ENABLE;
+ ge_mac_cfg_0.rx_fc_en = NPS_ENET_ENABLE;
+ ge_mac_cfg_0.tx_fc_retr = NPS_ENET_GE_MAC_CFG_0_TX_FC_RETR;
+
+ /* Enable Rx and Tx */
+ ge_mac_cfg_0.rx_en = NPS_ENET_ENABLE;
+ ge_mac_cfg_0.tx_en = NPS_ENET_ENABLE;
+
+ nps_enet_reg_set(net_priv, NPS_ENET_REG_GE_MAC_CFG_0,
+ ge_mac_cfg_0.value);
+}
+
+static void nps_enet_hw_disable_control(struct net_device *netdev)
+{
+ struct nps_enet_priv *net_priv = netdev_priv(netdev);
+
+ /* Disable interrupts */
+ nps_enet_reg_set(net_priv, NPS_ENET_REG_BUF_INT_ENABLE, 0);
+
+ /* Disable Rx and Tx */
+ nps_enet_reg_set(net_priv, NPS_ENET_REG_GE_MAC_CFG_0, 0);
+}
+
+static void nps_enet_send_frame(struct net_device *netdev,
+ struct sk_buff *skb)
+{
+ struct nps_enet_priv *net_priv = netdev_priv(netdev);
+ struct nps_enet_tx_ctl tx_ctrl = { .value = 0 };
+ short length = skb->len;
+ s32 i, len = NPS_ENET_WORDS_NUM(length);
+ u32 *src = (u32 *)virt_to_phys(skb->data);
+ bool src_is_aligned = !((u32)src & NPS_ENET_INT_MASK);
+
+ /* In case src is not aligned we need an intermediate buffer */
+ if (src_is_aligned)
+ for (i = 0; i < len; i++, src++)
+ nps_enet_reg_set(net_priv, NPS_ENET_REG_TX_BUF, *src);
+ else { /* !src_is_aligned */
+ for (i = 0; i < len; i++, src++) {
+ u32 buf;
+
+ /* to accommodate word-unaligned address of "src"
+ * we have to do memcpy() instead of simple "="
+ */
+ memcpy(&buf, src, sizeof(buf));
+ nps_enet_reg_set(net_priv, NPS_ENET_REG_TX_BUF, buf);
+ }
+ }
+ /* Write the length of the Frame */
+ tx_ctrl.nt = length;
+
+ /* Indicate SW is done */
+ net_priv->tx_packet_sent = true;
+ tx_ctrl.ct = NPS_ENET_ENABLE;
+
+ /* Send Frame */
+ nps_enet_reg_set(net_priv, NPS_ENET_REG_TX_CTL, tx_ctrl.value);
+}
+
+/**
+ * nps_enet_set_mac_address - Set the MAC address for this device.
+ * @ndev: Pointer to net_device structure.
+ * @p: 6 byte Address to be written as MAC address.
+ *
+ * This function copies the HW address from the sockaddr structure to the
+ * net_device structure and updates the address in HW.
+ *
+ * returns: -EBUSY if the net device is busy or 0 if the address is set
+ * successfully.
+ */
+static s32 nps_enet_set_mac_address(struct net_device *ndev, void *p)
+{
+ struct sockaddr *addr = p;
+ s32 res;
+
+ if (netif_running(ndev))
+ return -EBUSY;
+
+ res = eth_mac_addr(ndev, p);
+ if (!res) {
+ ether_addr_copy(ndev->dev_addr, addr->sa_data);
+ nps_enet_set_hw_mac_address(ndev);
+ }
+
+ return res;
+}
+
+/**
+ * nps_enet_open - Open the network device.
+ * @ndev: Pointer to the network device.
+ *
+ * returns: 0, on success or non-zero error value on failure.
+ *
+ * This function enables an IRQs for the ENET device and starts the Tx queue.
+ */
+static s32 nps_enet_open(struct net_device *ndev)
+{
+ s32 err;
+ struct nps_enet_priv *net_priv = netdev_priv(ndev);
+
+ /* Reset private variables */
+ net_priv->tx_packet_sent = false;
+ net_priv->ge_mac_cfg_2.value = 0;
+ net_priv->ge_mac_cfg_3.value = 0;
+
+ /* ge_mac_cfg_3 default values */
+ net_priv->ge_mac_cfg_3.rx_ifg_th = NPS_ENET_GE_MAC_CFG_3_RX_IFG_TH;
+ net_priv->ge_mac_cfg_3.max_len = NPS_ENET_GE_MAC_CFG_3_MAX_LEN;
+
+ /* Disable HW device */
+ nps_enet_hw_disable_control(ndev);
+
+ /* irq Rx allocation */
+ err = request_irq(net_priv->irq, nps_enet_irq_handler,
+ 0, "enet-rx-tx", ndev);
+ if (err)
+ return err;
+
+ /* Enable HW device */
+ nps_enet_hw_reset(ndev);
+ nps_enet_hw_enable_control(ndev);
+
+ netif_start_queue(ndev);
+
+ return 0;
+}
+
+/**
+ * nps_enet_stop - Close the network device.
+ * @ndev: Pointer to the network device.
+ *
+ * This function stops the Tx queue, disables interrupts for the ENET device.
+ */
+static s32 nps_enet_stop(struct net_device *ndev)
+{
+ struct nps_enet_priv *net_priv = netdev_priv(ndev);
+
+ netif_stop_queue(ndev);
+
+ nps_enet_hw_disable_control(ndev);
+
+ free_irq(net_priv->irq, ndev);
+
+ return 0;
+}
+
+/**
+ * nps_enet_start_xmit - Starts the data transmission.
+ * @skb: sk_buff pointer that contains data to be Transmitted.
+ * @ndev: Pointer to net_device structure.
+ *
+ * returns: NETDEV_TX_OK, on success
+ * NETDEV_TX_BUSY, if any of the descriptors are not free.
+ *
+ * This function is invoked from upper layers to initiate transmission.
+ */
+static netdev_tx_t nps_enet_start_xmit(struct sk_buff *skb,
+ struct net_device *ndev)
+{
+ /* This driver handles one frame at a time */
+ netif_stop_queue(ndev);
+
+ nps_enet_send_frame(ndev, skb);
+
+ dev_kfree_skb(skb);
+
+ return NETDEV_TX_OK;
+}
+
+/**
+ * nps_enet_get_stats - Get system network statistics.
+ * @ndev: Pointer to net_device structure.
+ *
+ * Returns the address of the device statistics structure.
+ * Statistics are updated in interrupt handler.
+ */
+static struct net_device_stats *nps_enet_get_stats(struct net_device *ndev)
+{
+ return &ndev->stats;
+}
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void nps_enet_poll_controller(struct net_device *ndev)
+{
+ disable_irq(ndev->irq);
+ nps_enet_board_irq_handler(ndev->irq, ndev);
+ enable_irq(ndev->irq);
+}
+#endif
+
+static const struct net_device_ops nps_netdev_ops = {
+ .ndo_open = nps_enet_open,
+ .ndo_stop = nps_enet_stop,
+ .ndo_start_xmit = nps_enet_start_xmit,
+ .ndo_get_stats = nps_enet_get_stats,
+ .ndo_set_mac_address = nps_enet_set_mac_address,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+ .ndo_poll_controller = nps_enet_poll_controller,
+#endif
+};
+
+static s32 nps_enet_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct net_device *netdev;
+ struct nps_enet_priv *net_priv;
+ s32 err = 0;
+ const char *mac_addr;
+ struct resource res_regs;
+
+ if (!dev->of_node)
+ return -ENODEV;
+
+ netdev = alloc_etherdev(sizeof(struct nps_enet_priv));
+ if (!netdev)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, netdev);
+ SET_NETDEV_DEV(netdev, dev);
+ net_priv = netdev_priv(netdev);
+
+ /* Get ENET registers base address from device tree */
+ err = of_address_to_resource(dev->of_node, 0, &res_regs);
+ if (err) {
+ dev_err(dev, "failed to retrieve registers base from device tree\n");
+ err = -ENODEV;
+ goto out_netdev;
+ }
+
+ /* The EZ NET specific entries in the device structure. */
+ netdev->netdev_ops = &nps_netdev_ops;
+ netdev->watchdog_timeo = (400 * HZ / 1000);
+ netdev->flags &= ~IFF_MULTICAST;
+
+ net_priv->regs_base = devm_ioremap_resource(dev, &res_regs);
+ if (IS_ERR(net_priv->regs_base)) {
+ err = PTR_ERR(net_priv->regs_base);
+ goto out_netdev;
+ }
+ dev_dbg(dev, "Registers base address is 0x%p\n", net_priv->regs_base);
+
+ /* set kernel MAC address to dev */
+ mac_addr = of_get_mac_address(dev->of_node);
+ if (mac_addr)
+ ether_addr_copy(netdev->dev_addr, mac_addr);
+ else
+ eth_hw_addr_random(netdev);
+
+ /* Get IRQ number from device tree */
+ net_priv->irq = irq_of_parse_and_map(dev->of_node, 0);
+ if (!net_priv->irq) {
+ dev_err(dev, "failed to retrieve <irq Rx-Tx> value from device tree\n");
+ err = -ENODEV;
+ goto out_netdev;
+ }
+
+ /* Register the driver. Should be the last thing in probe */
+ err = register_netdev(netdev);
+ if (err) {
+ dev_err(dev, "Failed to register netdev for %s, err = 0x%08x\n",
+ netdev->name, (s32)err);
+ err = -ENODEV;
+ goto out_netdev;
+ }
+
+ dev_info(dev, "(rx/tx=%d)\n", net_priv->irq);
+
+out_netdev:
+ if (err)
+ free_netdev(netdev);
+
+ return 0;
+}
+
+static s32 nps_enet_remove(struct platform_device *pdev)
+{
+ struct net_device *netdev = platform_get_drvdata(pdev);
+
+ unregister_netdev(netdev);
+
+ free_netdev(netdev);
+
+ return 0;
+}
+
+static const struct of_device_id nps_enet_dt_ids[] = {
+ { .compatible = "ezchip,nps-enet" },
+ { /* Sentinel */ }
+};
+
+static struct platform_driver nps_enet_driver = {
+ .probe = nps_enet_probe,
+ .remove = nps_enet_remove,
+ .driver = {
+ .name = DRV_NAME,
+ .of_match_table = nps_enet_dt_ids,
+ },
+};
+
+module_platform_driver(nps_enet_driver);
+
+MODULE_AUTHOR("EZchip Semiconductor");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/net/ethernet/ezchip/nps_enet.h b/drivers/net/ethernet/ezchip/nps_enet.h
new file mode 100644
index 0000000..07ce7ad
--- /dev/null
+++ b/drivers/net/ethernet/ezchip/nps_enet.h
@@ -0,0 +1,311 @@
+/*
+ * Copyright(c) 2015 EZchip Technologies.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.
+ *
+ * The full GNU General Public License is included in this distribution in
+ * the file called "COPYING".
+ */
+
+#ifndef _NPS_ENET_H
+#define _NPS_ENET_H
+
+/* default values */
+#define NPS_ENET_MAX_FRAME_LENGTH 0x3FFF
+#define NPS_ENET_GE_MAC_CFG_0_TX_FC_RETR 0x7
+#define NPS_ENET_GE_MAC_CFG_0_RX_IFG 0x5
+#define NPS_ENET_GE_MAC_CFG_0_TX_IFG 0xC
+#define NPS_ENET_GE_MAC_CFG_0_TX_PR_LEN 0x7
+#define NPS_ENET_GE_MAC_CFG_2_STAT_EN 0x3
+#define NPS_ENET_GE_MAC_CFG_3_RX_IFG_TH 0x14
+#define NPS_ENET_GE_MAC_CFG_3_MAX_LEN 0x3FFC
+#define NPS_ENET_ENABLE 1
+#define NPS_ENET_DISABLE 0
+
+/* register definitions */
+#define NPS_ENET_REG_TX_CTL 0x800
+#define NPS_ENET_REG_TX_BUF 0x808
+#define NPS_ENET_REG_RX_CTL 0x810
+#define NPS_ENET_REG_RX_BUF 0x818
+#define NPS_ENET_REG_BUF_INT_ENABLE 0x8C0
+#define NPS_ENET_REG_GE_MAC_CFG_0 0x1000
+#define NPS_ENET_REG_GE_MAC_CFG_1 0x1004
+#define NPS_ENET_REG_GE_MAC_CFG_2 0x1008
+#define NPS_ENET_REG_GE_MAC_CFG_3 0x100C
+#define NPS_ENET_REG_GE_RST 0x1400
+#define NPS_ENET_REG_PHASE_FIFO_CTL 0x1404
+
+/* Tx control register */
+struct nps_enet_tx_ctl {
+ union {
+ /* ct: SW sets to indicate frame ready in Tx buffer for
+ * transmission. HW resets to when transmission done
+ * et: Transmit error
+ * nt: Length in bytes of Tx frame loaded to Tx buffer
+ */
+ struct {
+ u32
+ __reserved_1:16,
+ ct:1,
+ et:1,
+ __reserved_2:3,
+ nt:11;
+ };
+
+ u32 value;
+ };
+};
+
+/* Rx control register */
+struct nps_enet_rx_ctl {
+ union {
+ /* cr: HW sets to indicate frame ready in Rx buffer.
+ * SW resets to indicate host read received frame
+ * and new frames can be written to Rx buffer
+ * er: Rx error indication
+ * crc: Rx CRC error indication
+ * nr: Length in bytes of Rx frame loaded by MAC to Rx buffer
+ */
+ struct {
+ u32
+ __reserved_1:16,
+ cr:1,
+ er:1,
+ crc:1,
+ __reserved_2:2,
+ nr:11;
+ };
+
+ u32 value;
+ };
+};
+
+/* Interrupt enable for data buffer events register */
+struct nps_enet_buf_int_enable {
+ union {
+ /* tx_done: Interrupt generation in the case when new frame
+ * is ready in Rx buffer
+ * rx_rdy: Interrupt generation in the case when current frame
+ * was read from TX buffer
+ */
+ struct {
+ u32
+ __reserved:30,
+ tx_done:1,
+ rx_rdy:1;
+ };
+
+ u32 value;
+ };
+};
+
+/* Gbps Eth MAC Configuration 0 register */
+struct nps_enet_ge_mac_cfg_0 {
+ union {
+ /* tx_pr_len: Transmit preamble length in bytes
+ * tx_ifg_nib: Tx idle pattern
+ * nib_mode: Nibble (4-bit) Mode
+ * rx_pr_check_en: Receive preamble Check Enable
+ * tx_ifg: Transmit inter-Frame Gap
+ * rx_ifg: Receive inter-Frame Gap
+ * tx_fc_retr: Transmit Flow Control Retransmit Mode
+ * rx_length_check_en: Receive Length Check Enable
+ * rx_crc_ignore: Results of the CRC check are ignored
+ * rx_crc_strip: MAC strips the CRC from received frames
+ * rx_fc_en: Receive Flow Control Enable
+ * tx_crc_en: Transmit CRC Enabled
+ * tx_pad_en: Transmit Padding Enable
+ * tx_cf_en: Transmit Flow Control Enable
+ * tx_en: Transmit Enable
+ * rx_en: Receive Enable
+ */
+ struct {
+ u32
+ tx_pr_len:4,
+ tx_ifg_nib:4,
+ nib_mode:1,
+ rx_pr_check_en:1,
+ tx_ifg:6,
+ rx_ifg:4,
+ tx_fc_retr:3,
+ rx_length_check_en:1,
+ rx_crc_ignore:1,
+ rx_crc_strip:1,
+ rx_fc_en:1,
+ tx_crc_en:1,
+ tx_pad_en:1,
+ tx_fc_en:1,
+ tx_en:1,
+ rx_en:1;
+ };
+
+ u32 value;
+ };
+};
+
+/* Gbps Eth MAC Configuration 1 register */
+struct nps_enet_ge_mac_cfg_1 {
+ union {
+ /* octet_3: MAC address octet 3
+ * octet_2: MAC address octet 2
+ * octet_1: MAC address octet 1
+ * octet_0: MAC address octet 0
+ */
+ struct {
+ u32
+ octet_3:8,
+ octet_2:8,
+ octet_1:8,
+ octet_0:8;
+ };
+
+ u32 value;
+ };
+};
+
+/* Gbps Eth MAC Configuration 2 register */
+struct nps_enet_ge_mac_cfg_2 {
+ union {
+ /* transmit_flush_en: MAC flush enable
+ * stat_en: RMON statistics interface enable
+ * disc_da: Discard frames with DA different
+ * from MAC address
+ * disc_bc: Discard broadcast frames
+ * disc_mc: Discard multicast frames
+ * octet_5: MAC address octet 5
+ * octet_4: MAC address octet 4
+ */
+ struct {
+ u32
+ transmit_flush_en:1,
+ __reserved_1:5,
+ stat_en:2,
+ __reserved_2:1,
+ disc_da:1,
+ disc_bc:1,
+ disc_mc:1,
+ __reserved_3:4,
+ octet_5:8,
+ octet_4:8;
+ };
+
+ u32 value;
+ };
+};
+
+/* Gbps Eth MAC Configuration 3 register */
+struct nps_enet_ge_mac_cfg_3 {
+ union {
+ /* ext_oob_cbfc_sel: Selects one of the 4 profiles for
+ * extended OOB in-flow-control indication
+ * max_len: Maximum receive frame length in bytes
+ * tx_cbfc_en: Enable transmission of class-based
+ * flow control packets
+ * rx_ifg_th: Threshold for IFG status reporting via OOB
+ * cf_timeout: Configurable time to decrement FC counters
+ * cf_drop: Drop control frames
+ * redirect_cbfc_sel: Selects one of CBFC redirect profiles
+ * rx_cbfc_redir_en: Enable Rx class-based flow
+ * control redirect
+ * rx_cbfc_en: Enable Rx class-based flow control
+ * tm_hd_mode: TM header mode
+ */
+ struct {
+ u32
+ ext_oob_cbfc_sel:2,
+ max_len:14,
+ tx_cbfc_en:1,
+ rx_ifg_th:5,
+ cf_timeout:4,
+ cf_drop:1,
+ redirect_cbfc_sel:2,
+ rx_cbfc_redir_en:1,
+ rx_cbfc_en:1,
+ tm_hd_mode:1;
+ };
+
+ u32 value;
+ };
+};
+
+/* GE MAC, PCS reset control register */
+struct nps_enet_ge_rst {
+ union {
+ /* gmac_0: GE MAC reset
+ * spcs_0: SGMII PCS reset
+ */
+ struct {
+ u32
+ __reserved_1:23,
+ gmac_0:1,
+ __reserved_2:7,
+ spcs_0:1;
+ };
+
+ u32 value;
+ };
+};
+
+/* Tx phase sync FIFO control register */
+struct nps_enet_phase_fifo_ctl {
+ union {
+ /* init: initialize serdes TX phase sync FIFO pointers
+ * rst: reset serdes TX phase sync FIFO
+ */
+ struct {
+ u32
+ __reserved:30,
+ init:1,
+ rst:1;
+ };
+
+ u32 value;
+ };
+};
+
+/**
+ * struct nps_enet_priv - Storage of ENET's private information.
+ * @regs: Base address of ENET memory-mapped control registers.
+ * @irq: For RX/TX IRQ number.
+ * @tx_packet_sent: SW indication if frame is being sent
+ */
+struct nps_enet_priv {
+ void __iomem *regs_base;
+ s32 irq;
+ bool tx_packet_sent;
+ struct nps_enet_ge_mac_cfg_2 ge_mac_cfg_2;
+ struct nps_enet_ge_mac_cfg_3 ge_mac_cfg_3;
+};
+
+/**
+ * nps_reg_set - Sets ENET register with provided value.
+ * @priv: Pointer to EZchip ENET private data structure.
+ * @reg: Register offset from base address.
+ * @value: Value to set in register.
+ */
+static inline void nps_enet_reg_set(struct nps_enet_priv *priv,
+ s32 reg, s32 value)
+{
+ iowrite32be(value, priv->regs_base + reg);
+}
+
+/**
+ * nps_reg_get - Gets value of specified ENET register.
+ * @priv: Pointer to EZchip ENET private data structure.
+ * @reg: Register offset from base address.
+ *
+ * returns: Value of requested register.
+ */
+static inline u32 nps_enet_reg_get(struct nps_enet_priv *priv, s32 reg)
+{
+ return ioread32be(priv->regs_base + reg);
+}
+
+#endif /* _NPS_ENET_H */
--
1.7.1
--
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