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Date: Mon, 22 Jun 2015 10:45:15 -0700
From: Mahesh Bandewar <maheshb@...gle.com>
To: Noam Camus <noamc@...hip.com>
Cc: linux-netdev <netdev@...r.kernel.org>,
linux-kernel@...r.kernel.org, Alexey.Brodkin@...opsys.com,
vgupta@...opsys.com, giladb@...hip.com, cmetcalf@...hip.com,
Tal Zilcer <talz@...hip.com>
Subject: Re: [PATCH v5] NET: Add ezchip ethernet driver
On Tue, Jun 16, 2015 at 7:35 AM, Noam Camus <noamc@...hip.com> wrote:
>
> From: Noam Camus <noamc@...hip.com>
>
> Simple LAN device for debug or management purposes.
> Device supports interrupts for RX and TX(completion).
> Device does not have DMA ability.
>
> Signed-off-by: Noam Camus <noamc@...hip.com>
> Signed-off-by: Tal Zilcer <talz@...hip.com>
> Acked-by: Alexey Brodkin <abrodkin@...opsys.com>
> ---
> Change log for v5:
> Basically its all based on Florian comments.
> Main items are:
> 1) Move all interrupt chore to bottom-half
> 2) use memcpy_toio/fromio
> 3) dev_kfree_skb() moved to bottom-half
> 4) add set_rx_mode callback
> 5) use platform api toward non-DT platforms
> ---
> .../devicetree/bindings/net/ezchip_enet.txt | 15 +
> drivers/net/ethernet/Kconfig | 1 +
> drivers/net/ethernet/Makefile | 1 +
> drivers/net/ethernet/ezchip/Kconfig | 27 +
> drivers/net/ethernet/ezchip/Makefile | 1 +
> drivers/net/ethernet/ezchip/nps_enet.c | 652 ++++++++++++++++++++
> drivers/net/ethernet/ezchip/nps_enet.h | 336 ++++++++++
> 7 files changed, 1033 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..4e29b2b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/ezchip_enet.txt
> @@ -0,0 +1,15 @@
> +* EZchip NPS Management Ethernet port driver
> +
> +Required properties:
> +- compatible: Should be "ezchip,nps-mgt-enet"
> +- reg: Address and length of the register set for the device
> +- interrupts: Should contain the ENET interrupt
> +
> +Examples:
> +
> + ethernet@...03000 {
> + compatible = "ezchip,nps-mgt-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..d031177
> --- /dev/null
> +++ b/drivers/net/ethernet/ezchip/Kconfig
> @@ -0,0 +1,27 @@
> +#
> +# EZchip network device configuration
> +#
> +
> +config NET_VENDOR_EZCHIP
> + bool "EZchip devices"
> + default y
>
Why this has to be included in the default build? Shouldn't it be
either "m" or "N" by default?
> + ---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_MANAGEMENT_ENET
> + tristate "EZchip NPS management enet support"
> + ---help---
> + Simple LAN device for debug or management purposes.
> + Device supports interrupts for RX and TX(completion).
> + Device does not have DMA ability.
> +
> +endif
> diff --git a/drivers/net/ethernet/ezchip/Makefile b/drivers/net/ethernet/ezchip/Makefile
> new file mode 100644
> index 0000000..e490176
> --- /dev/null
> +++ b/drivers/net/ethernet/ezchip/Makefile
> @@ -0,0 +1 @@
> +obj-$(CONFIG_EZCHIP_NPS_MANAGEMENT_ENET) += 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..df3d5b0
> --- /dev/null
> +++ b/drivers/net/ethernet/ezchip/nps_enet.c
> @@ -0,0 +1,652 @@
> +/*
> + * 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_mgt_enet"
> +
> +static void nps_enet_clean_rx_fifo(struct net_device *ndev, u32 frame_len)
> +{
> + struct nps_enet_priv *priv = netdev_priv(ndev);
> + u32 i, len = DIV_ROUND_UP(frame_len, sizeof(u32));
> +
> + /* Empty Rx FIFO buffer by reading all words */
> + for (i = 0; i < len; i++)
> + nps_enet_reg_get(priv, NPS_ENET_REG_RX_BUF);
> +}
> +
> +static void nps_enet_read_rx_fifo(struct net_device *ndev,
> + unsigned char *dst, u32 length)
> +{
> + struct nps_enet_priv *priv = netdev_priv(ndev);
> + s32 i, last = length & (sizeof(u32) - 1);
> + u32 *reg = (u32 *)dst, len = length / sizeof(u32);
> + bool dst_is_aligned = IS_ALIGNED((u32)dst, sizeof(u32));
> +
> + /* 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(priv, NPS_ENET_REG_RX_BUF);
> + else { /* !dst_is_aligned */
> + for (i = 0; i < len; i++, reg++) {
> + u32 buf =
> + nps_enet_reg_get(priv, NPS_ENET_REG_RX_BUF);
> +
> + /* to accommodate word-unaligned address of "reg"
> + * we have to do memcpy_toio() instead of simple "=".
> + */
> + memcpy_toio(reg, &buf, sizeof(buf));
> + }
> + }
> +
> + /* copy last bytes (if any) */
> + if (last) {
> + u32 buf = nps_enet_reg_get(priv, NPS_ENET_REG_RX_BUF);
> +
> + memcpy_toio(reg, &buf, last);
> + }
> +}
> +
> +static u32 nps_enet_rx_handler(struct net_device *ndev)
> +{
> + u32 frame_len, err = 0;
> + u32 work_done = 0;
> + struct nps_enet_priv *priv = netdev_priv(ndev);
> + struct sk_buff *skb;
> + struct nps_enet_rx_ctl rx_ctrl;
> +
> + rx_ctrl.value = nps_enet_reg_get(priv, NPS_ENET_REG_RX_CTL);
> + frame_len = rx_ctrl.nr;
> +
> + /* Check if we got RX */
> + if (!rx_ctrl.cr)
> + return work_done;
> +
> + /* If we got here there is a work for us */
> + work_done++;
> +
> + /* Check Rx error */
> + if (rx_ctrl.er) {
> + ndev->stats.rx_errors++;
> + err = 1;
> + }
> +
> + /* Check Rx CRC error */
> + if (rx_ctrl.crc) {
> + ndev->stats.rx_crc_errors++;
> + ndev->stats.rx_dropped++;
> + err = 1;
> + }
> +
> + /* Check Frame length Min 64b */
> + if (unlikely(frame_len < ETH_ZLEN)) {
> + ndev->stats.rx_length_errors++;
> + ndev->stats.rx_dropped++;
> + err = 1;
> + }
> +
> + if (err)
> + goto rx_irq_clean;
> +
> + /* Skb allocation */
> + skb = netdev_alloc_skb_ip_align(ndev, frame_len);
> + if (unlikely(!skb)) {
> + ndev->stats.rx_errors++;
> + ndev->stats.rx_dropped++;
> + goto rx_irq_clean;
> + }
> +
> + /* Copy frame from Rx fifo into the skb */
> + nps_enet_read_rx_fifo(ndev, skb->data, frame_len);
> +
> + skb_put(skb, frame_len);
> + skb->protocol = eth_type_trans(skb, ndev);
> + skb->ip_summed = CHECKSUM_UNNECESSARY;
> +
> + ndev->stats.rx_packets++;
> + ndev->stats.rx_bytes += frame_len;
> + netif_receive_skb(skb);
> +
> + goto rx_irq_frame_done;
> +
> +rx_irq_clean:
> + /* Clean Rx fifo */
> + nps_enet_clean_rx_fifo(ndev, frame_len);
> +
> +rx_irq_frame_done:
> + /* Ack Rx ctrl register */
> + nps_enet_reg_set(priv, NPS_ENET_REG_RX_CTL, 0);
> +
> + return work_done;
> +}
> +
> +static void nps_enet_tx_handler(struct net_device *ndev)
> +{
> + struct nps_enet_priv *priv = netdev_priv(ndev);
> + struct nps_enet_tx_ctl tx_ctrl;
> +
> + tx_ctrl.value = nps_enet_reg_get(priv, NPS_ENET_REG_TX_CTL);
> +
> + /* Check if we got TX */
> + if (!priv->tx_packet_sent || tx_ctrl.ct)
> + return;
> +
> + /* Check Tx transmit error */
> + if (unlikely(tx_ctrl.et)) {
> + ndev->stats.tx_errors++;
> + } else {
> + ndev->stats.tx_packets++;
> + ndev->stats.tx_bytes += tx_ctrl.nt;
> + }
> +
> + if (priv->tx_skb) {
> + dev_kfree_skb(priv->tx_skb);
> + priv->tx_skb = NULL;
> + }
> +
> + priv->tx_packet_sent = false;
> +
> + if (netif_queue_stopped(ndev))
> + netif_wake_queue(ndev);
> +}
> +
> +/**
> + * nps_enet_poll - NAPI poll handler.
> + * @napi: Pointer to napi_struct structure.
> + * @budget: How many frames to process on one call.
> + *
> + * returns: Number of processed frames
> + */
> +static int nps_enet_poll(struct napi_struct *napi, int budget)
> +{
> + struct net_device *ndev = napi->dev;
> + struct nps_enet_priv *priv = netdev_priv(ndev);
> + struct nps_enet_buf_int_enable buf_int_enable = {
> + .rx_rdy = NPS_ENET_ENABLE,
> + .tx_done = NPS_ENET_ENABLE,};
> + u32 work_done;
> +
> + nps_enet_tx_handler(ndev);
> + work_done = nps_enet_rx_handler(ndev);
> + if (work_done < budget) {
> + napi_complete(napi);
> + nps_enet_reg_set(priv, NPS_ENET_REG_BUF_INT_ENABLE,
> + buf_int_enable.value);
> + }
> +
> + return work_done;
> +}
> +
> +/**
> + * 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 registers we may tell what is a reason for interrupt to fire up.
> + * We got one for RX and the other for TX (completion).
> + */
> +static irqreturn_t nps_enet_irq_handler(s32 irq, void *dev_instance)
> +{
> + struct net_device *ndev = dev_instance;
> + struct nps_enet_priv *priv = netdev_priv(ndev);
> + struct nps_enet_buf_int_cause buf_int_cause;
> +
> + buf_int_cause.value =
> + nps_enet_reg_get(priv, NPS_ENET_REG_BUF_INT_CAUSE);
> +
> + if (buf_int_cause.tx_done || buf_int_cause.rx_rdy)
> + if (likely(napi_schedule_prep(&priv->napi))) {
> + nps_enet_reg_set(priv, NPS_ENET_REG_BUF_INT_ENABLE, 0);
> + __napi_schedule(&priv->napi);
> + }
> +
> + return IRQ_HANDLED;
> +}
> +
> +static void nps_enet_set_hw_mac_address(struct net_device *ndev)
> +{
> + struct nps_enet_priv *priv = netdev_priv(ndev);
> + struct nps_enet_ge_mac_cfg_1 ge_mac_cfg_1;
> + struct nps_enet_ge_mac_cfg_2 *ge_mac_cfg_2 = &priv->ge_mac_cfg_2;
> +
> + /* set MAC address in HW */
> + ge_mac_cfg_1.octet_0 = ndev->dev_addr[0];
> + ge_mac_cfg_1.octet_1 = ndev->dev_addr[1];
> + ge_mac_cfg_1.octet_2 = ndev->dev_addr[2];
> + ge_mac_cfg_1.octet_3 = ndev->dev_addr[3];
> + ge_mac_cfg_2->octet_4 = ndev->dev_addr[4];
> + ge_mac_cfg_2->octet_5 = ndev->dev_addr[5];
> +
> + nps_enet_reg_set(priv, NPS_ENET_REG_GE_MAC_CFG_1,
> + ge_mac_cfg_1.value);
> +
> + nps_enet_reg_set(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 *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(priv, NPS_ENET_REG_GE_RST, ge_rst.value);
> + usleep_range(10, 20);
> + ge_rst.value = 0;
> + nps_enet_reg_set(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(priv, NPS_ENET_REG_PHASE_FIFO_CTL,
> + phase_fifo_ctl.value);
> + usleep_range(10, 20);
> + phase_fifo_ctl.value = 0;
> + nps_enet_reg_set(priv, NPS_ENET_REG_PHASE_FIFO_CTL,
> + phase_fifo_ctl.value);
> +}
> +
> +static void nps_enet_hw_enable_control(struct net_device *ndev)
> +{
> + struct nps_enet_priv *priv = netdev_priv(ndev);
> + 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 = &priv->ge_mac_cfg_2;
> + struct nps_enet_ge_mac_cfg_3 *ge_mac_cfg_3 = &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(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 + ndev->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(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(priv, NPS_ENET_REG_BUF_INT_ENABLE,
> + buf_int_enable.value);
> +
> + /* Write device MAC address to HW */
> + nps_enet_set_hw_mac_address(ndev);
> +
> + /* 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(priv, NPS_ENET_REG_GE_MAC_CFG_0,
> + ge_mac_cfg_0.value);
> +}
> +
> +static void nps_enet_hw_disable_control(struct net_device *ndev)
> +{
> + struct nps_enet_priv *priv = netdev_priv(ndev);
> +
> + /* Disable interrupts */
> + nps_enet_reg_set(priv, NPS_ENET_REG_BUF_INT_ENABLE, 0);
> +
> + /* Disable Rx and Tx */
> + nps_enet_reg_set(priv, NPS_ENET_REG_GE_MAC_CFG_0, 0);
> +}
> +
> +static void nps_enet_send_frame(struct net_device *ndev,
> + struct sk_buff *skb)
> +{
> + struct nps_enet_priv *priv = netdev_priv(ndev);
> + struct nps_enet_tx_ctl tx_ctrl = { .value = 0 };
> + short length = skb->len;
> + u32 i, len = DIV_ROUND_UP(length, sizeof(u32));
> + u32 *src = (u32 *)virt_to_phys(skb->data);
> + bool src_is_aligned = IS_ALIGNED((u32)src, sizeof(u32));
> +
> + /* 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(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_fromio() instead of simple "="
> + */
> + memcpy_fromio(&buf, src, sizeof(buf));
> + nps_enet_reg_set(priv, NPS_ENET_REG_TX_BUF, buf);
> + }
> + }
> + /* Write the length of the Frame */
> + tx_ctrl.nt = length;
> +
> + /* Indicate SW is done */
> + priv->tx_packet_sent = true;
> + tx_ctrl.ct = NPS_ENET_ENABLE;
> +
> + /* Send Frame */
> + nps_enet_reg_set(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_set_rx_mode - Change the receive filtering mode.
> + * @ndev: Pointer to the network device.
> + *
> + * This function enables/disables promiscuous mode
> + */
> +static void nps_enet_set_rx_mode(struct net_device *ndev)
> +{
> + struct nps_enet_priv *priv = netdev_priv(ndev);
> + struct nps_enet_ge_mac_cfg_2 ge_mac_cfg_2;
> +
> + ge_mac_cfg_2.value = priv->ge_mac_cfg_2.value;
> +
> + if (ndev->flags & IFF_PROMISC) {
> + ge_mac_cfg_2.disc_da = NPS_ENET_DISABLE;
> + ge_mac_cfg_2.disc_mc = NPS_ENET_DISABLE;
> + } else {
> + ge_mac_cfg_2.disc_da = NPS_ENET_ENABLE;
> + ge_mac_cfg_2.disc_mc = NPS_ENET_ENABLE;
> + }
> +
> + nps_enet_reg_set(priv, NPS_ENET_REG_GE_MAC_CFG_2, ge_mac_cfg_2.value);
> +}
> +
> +/**
> + * 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)
> +{
> + struct nps_enet_priv *priv = netdev_priv(ndev);
> + s32 err;
> +
> + /* Reset private variables */
> + priv->tx_packet_sent = false;
> + priv->ge_mac_cfg_2.value = 0;
> + priv->ge_mac_cfg_3.value = 0;
> +
> + /* ge_mac_cfg_3 default values */
> + priv->ge_mac_cfg_3.rx_ifg_th = NPS_ENET_GE_MAC_CFG_3_RX_IFG_TH;
> + 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(priv->irq, nps_enet_irq_handler,
> + 0, "enet-rx-tx", ndev);
> + if (err)
> + return err;
> +
> + napi_enable(&priv->napi);
> +
> + /* 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 *priv = netdev_priv(ndev);
> +
> + napi_disable(&priv->napi);
> + netif_stop_queue(ndev);
> + nps_enet_hw_disable_control(ndev);
> + free_irq(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)
> +{
> + struct nps_enet_priv *priv = netdev_priv(ndev);
> +
> + /* This driver handles one frame at a time */
> + netif_stop_queue(ndev);
> +
> + nps_enet_send_frame(ndev, skb);
> +
> + priv->tx_skb = skb;
> +
> + return NETDEV_TX_OK;
> +}
> +
> +#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_set_mac_address = nps_enet_set_mac_address,
> + .ndo_set_rx_mode = nps_enet_set_rx_mode,
> +#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 *ndev;
> + struct nps_enet_priv *priv;
> + s32 err = 0;
> + const char *mac_addr;
> + struct resource *res_regs;
> +
> + if (!dev->of_node)
> + return -ENODEV;
> +
> + ndev = alloc_etherdev(sizeof(struct nps_enet_priv));
> + if (!ndev)
> + return -ENOMEM;
> +
> + platform_set_drvdata(pdev, ndev);
> + SET_NETDEV_DEV(ndev, dev);
> + priv = netdev_priv(ndev);
> +
> + /* The EZ NET specific entries in the device structure. */
> + ndev->netdev_ops = &nps_netdev_ops;
> + ndev->watchdog_timeo = (400 * HZ / 1000);
> + /* FIXME :: no multicast support yet */
> + ndev->flags &= ~IFF_MULTICAST;
> +
> + res_regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + priv->regs_base = devm_ioremap_resource(dev, res_regs);
> + if (IS_ERR(priv->regs_base)) {
> + err = PTR_ERR(priv->regs_base);
> + goto out_netdev;
> + }
> + dev_dbg(dev, "Registers base address is 0x%p\n", priv->regs_base);
> +
> + /* set kernel MAC address to dev */
> + mac_addr = of_get_mac_address(dev->of_node);
> + if (mac_addr)
> + ether_addr_copy(ndev->dev_addr, mac_addr);
> + else
> + eth_hw_addr_random(ndev);
> +
> + /* Get IRQ number */
> + priv->irq = platform_get_irq(pdev, 0);
> + if (!priv->irq) {
> + dev_err(dev, "failed to retrieve <irq Rx-Tx> value from device tree\n");
> + err = -ENODEV;
> + goto out_netdev;
> + }
> +
> + netif_napi_add(ndev, &priv->napi, nps_enet_poll, NPS_ENET_NAPI_POLL_WEIGHT);
> +
> + /* Register the driver. Should be the last thing in probe */
> + err = register_netdev(ndev);
> + if (err) {
> + dev_err(dev, "Failed to register ndev for %s, err = 0x%08x\n",
> + ndev->name, (s32)err);
> + err = -ENODEV;
> + goto out_netif_api;
> + }
> +
> + dev_info(dev, "(rx/tx=%d)\n", priv->irq);
> + return 0;
> +
> +out_netif_api:
> + netif_napi_del(&priv->napi);
> +out_netdev:
> + if (err)
> + free_netdev(ndev);
> +
> + return err;
> +}
> +
> +static s32 nps_enet_remove(struct platform_device *pdev)
> +{
> + struct net_device *ndev = platform_get_drvdata(pdev);
> + struct nps_enet_priv *priv = netdev_priv(ndev);
> +
> + unregister_netdev(ndev);
> + free_netdev(ndev);
> + netif_napi_del(&priv->napi);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id nps_enet_dt_ids[] = {
> + { .compatible = "ezchip,nps-mgt-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..fc45c9d
> --- /dev/null
> +++ b/drivers/net/ethernet/ezchip/nps_enet.h
> @@ -0,0 +1,336 @@
> +/*
> + * 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_NAPI_POLL_WEIGHT 0x2
> +#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_BUF_INT_CAUSE 0x8C4
> +#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;
> + };
> +};
> +
> +/* Interrupt cause for data buffer events register */
> +struct nps_enet_buf_int_cause {
> + union {
> + /* tx_done: Interrupt in the case when current frame was
> + * read from TX buffer.
> + * rx_rdy: Interrupt in the case when new frame is ready
> + * in RX 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: Base address of ENET memory-mapped control registers.
> + * @irq: For RX/TX IRQ number.
> + * @tx_packet_sent: SW indication if frame is being sent.
> + * @tx_skb: socket buffer of sent frame.
> + * @napi: Structure for NAPI.
> + */
> +struct nps_enet_priv {
> + void __iomem *regs_base;
> + s32 irq;
> + bool tx_packet_sent;
> + struct sk_buff *tx_skb;
> + struct napi_struct napi;
> + 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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