[v7] NET: Add ezchip ethernet driver

From: Noam Camus <noamc@ezchip.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@ezchip.com>
Signed-off-by: Tal Zilcer <talz@ezchip.com>
Acked-by: Alexey Brodkin <abrodkin@synopsys.com>
---
Change log for v7:

1) Update nps_enet_open() comment header. (Rami Rosen)
2) fix return value of nps_enet_probe() when register_netdev() fails. (Rami Rosen)
3) Fix Kconfig Help and add dependencies. (Paul Gortmaker)

NOTE: with new dependencies,OF && OF_NET need to be in your configuration.
Otherwise the driver will not be chosen and built.
---
 .../devicetree/bindings/net/ezchip_enet.txt        |   15 +
 drivers/net/ethernet/Kconfig                       |    1 +
 drivers/net/ethernet/Makefile                      |    1 +
 drivers/net/ethernet/ezchip/Kconfig                |   26 +
 drivers/net/ethernet/ezchip/Makefile               |    1 +
 drivers/net/ethernet/ezchip/nps_enet.c             |  658 ++++++++++++++++++++
 drivers/net/ethernet/ezchip/nps_enet.h             |  336 ++++++++++
 7 files changed, 1038 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

From: Noam Camus <noamc@ezchip.com>
Date: Tue, 23 Jun 2015 11:43:53 +0300

> From: Noam Camus <noamc@ezchip.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@ezchip.com>
> Signed-off-by: Tal Zilcer <talz@ezchip.com>
> Acked-by: Alexey Brodkin <abrodkin@synopsys.com>

Applied, thanks.
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On Tue, Jun 23, 2015 at 4:43 AM, Noam Camus <noamc@ezchip.com> wrote:
> From: Noam Camus <noamc@ezchip.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@ezchip.com>
> Signed-off-by: Tal Zilcer <talz@ezchip.com>
> Acked-by: Alexey Brodkin <abrodkin@synopsys.com>
> ---
> Change log for v7
>
> 1) Update nps_enet_open() comment header. (Rami Rosen)
> 2) fix return value of nps_enet_probe() when register_netdev() fails. (Rami Rosen)
> 3) Fix Kconfig Help and add dependencies. (Paul Gortmaker)

Hi Noam,

Thanks for making the changes I suggested.  But in the future, if you
get review comments from bob.smith@somewhere.com on version
N of your patchset, then add bob.smith@somewhere.com to the v(N+1)
send of the revised patch set.  There is a lot of mail traffic and if the
above does not happen, then your updates may not be seen.

Thanks,
P.
--

>
> NOTE: with new dependencies,OF && OF_NET need to be in your configuration.
> Otherwise the driver will not be chosen and built.
> ---
>  .../devicetree/bindings/net/ezchip_enet.txt        |   15 +
>  drivers/net/ethernet/Kconfig                       |    1 +
>  drivers/net/ethernet/Makefile                      |    1 +
>  drivers/net/ethernet/ezchip/Kconfig                |   26 +
>  drivers/net/ethernet/ezchip/Makefile               |    1 +
>  drivers/net/ethernet/ezchip/nps_enet.c             |  658 ++++++++++++++++++++
>  drivers/net/ethernet/ezchip/nps_enet.h             |  336 ++++++++++
>  7 files changed, 1038 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@f0003000 {
> +               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..48ecbc8
> --- /dev/null
> +++ b/drivers/net/ethernet/ezchip/Kconfig
> @@ -0,0 +1,26 @@
> +#
> +# 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.
> +
> +         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"
> +       depends on OF_IRQ && OF_NET
> +       ---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..24a85b2
> --- /dev/null
> +++ b/drivers/net/ethernet/ezchip/nps_enet.c
> @@ -0,0 +1,658 @@
> +/*
> + * 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((unsigned long)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((void __iomem *)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((void __iomem *)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;
> +       u32 work_done;
> +
> +       buf_int_enable.rx_rdy = NPS_ENET_ENABLE;
> +       buf_int_enable.tx_done = NPS_ENET_ENABLE;
> +       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;
> +       struct nps_enet_phase_fifo_ctl phase_fifo_ctl;
> +
> +       ge_rst.value = 0;
> +       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;
> +       struct nps_enet_buf_int_enable buf_int_enable;
> +       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;
> +
> +       ge_mac_cfg_0.value = 0;
> +       buf_int_enable.value = 0;
> +       /* 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;
> +       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((unsigned long)src, sizeof(u32));
> +
> +       tx_ctrl.value = 0;
> +       /* 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, (void __iomem *)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 sets the MAC address, requests and enables an IRQ
> + * 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_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);
> +               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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