Orange Pi5 kernel

/*
 * Combined Ethernet driver for Motorola MPC8xx and MPC82xx.
 *
 * Copyright (c) 2003 Intracom S.A.
 *  by Pantelis Antoniou <panto@intracom.gr>
 *
 * 2005 (c) MontaVista Software, Inc.
 * Vitaly Bordug <vbordug@ru.mvista.com>
 *
 * Heavily based on original FEC driver by Dan Malek <dan@embeddededge.com>
 * and modifications by Joakim Tjernlund <joakim.tjernlund@lumentis.se>
 *
 * This file is licensed under the terms of the GNU General Public License
 * version 2. This program is licensed "as is" without any warranty of any
 * kind, whether express or implied.
 */
 
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/ptrace.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/mii.h>
#include <linux/ethtool.h>
#include <linux/bitops.h>
#include <linux/fs.h>
#include <linux/platform_device.h>
#include <linux/phy.h>
#include <linux/of.h>
#include <linux/of_mdio.h>
#include <linux/of_platform.h>
#include <linux/of_gpio.h>
#include <linux/of_net.h>
#include <linux/pgtable.h>
 
#include <linux/vmalloc.h>
#include <asm/irq.h>
#include <linux/uaccess.h>
 
#include "fs_enet.h"
 
/*************************************************/
 
MODULE_AUTHOR("Pantelis Antoniou <panto@intracom.gr>");
MODULE_DESCRIPTION("Freescale Ethernet Driver");
MODULE_LICENSE("GPL");
 
static int fs_enet_debug = -1; /* -1 == use FS_ENET_DEF_MSG_ENABLE as value */
module_param(fs_enet_debug, int, 0);
MODULE_PARM_DESC(fs_enet_debug,
<------><------> "Freescale bitmapped debugging message enable value");
 
#define RX_RING_SIZE	32
#define TX_RING_SIZE	64
 
#ifdef CONFIG_NET_POLL_CONTROLLER
static void fs_enet_netpoll(struct net_device *dev);
#endif
 
static void fs_set_multicast_list(struct net_device *dev)
{
<------>struct fs_enet_private *fep = netdev_priv(dev);
 
<------>(*fep->ops->set_multicast_list)(dev);
}
 
static void skb_align(struct sk_buff *skb, int align)
{
<------>int off = ((unsigned long)skb->data) & (align - 1);
 
<------>if (off)
<------><------>skb_reserve(skb, align - off);
}
 
/* NAPI function */
static int fs_enet_napi(struct napi_struct *napi, int budget)
{
<------>struct fs_enet_private *fep = container_of(napi, struct fs_enet_private, napi);
<------>struct net_device *dev = fep->ndev;
<------>const struct fs_platform_info *fpi = fep->fpi;
<------>cbd_t __iomem *bdp;
<------>struct sk_buff *skb, *skbn;
<------>int received = 0;
<------>u16 pkt_len, sc;
<------>int curidx;
<------>int dirtyidx, do_wake, do_restart;
<------>int tx_left = TX_RING_SIZE;
 
<------>spin_lock(&fep->tx_lock);
<------>bdp = fep->dirty_tx;
 
<------>/* clear status bits for napi*/
<------>(*fep->ops->napi_clear_event)(dev);
 
<------>do_wake = do_restart = 0;
<------>while (((sc = CBDR_SC(bdp)) & BD_ENET_TX_READY) == 0 && tx_left) {
<------><------>dirtyidx = bdp - fep->tx_bd_base;
 
<------><------>if (fep->tx_free == fep->tx_ring)
<------><------><------>break;
 
<------><------>skb = fep->tx_skbuff[dirtyidx];
 
<------><------>/*
<------><------> * Check for errors.
<------><------> */
<------><------>if (sc & (BD_ENET_TX_HB | BD_ENET_TX_LC |
<------><------><------>  BD_ENET_TX_RL | BD_ENET_TX_UN | BD_ENET_TX_CSL)) {
 
<------><------><------>if (sc & BD_ENET_TX_HB)	/* No heartbeat */
<------><------><------><------>dev->stats.tx_heartbeat_errors++;
<------><------><------>if (sc & BD_ENET_TX_LC)	/* Late collision */
<------><------><------><------>dev->stats.tx_window_errors++;
<------><------><------>if (sc & BD_ENET_TX_RL)	/* Retrans limit */
<------><------><------><------>dev->stats.tx_aborted_errors++;
<------><------><------>if (sc & BD_ENET_TX_UN)	/* Underrun */
<------><------><------><------>dev->stats.tx_fifo_errors++;
<------><------><------>if (sc & BD_ENET_TX_CSL)	/* Carrier lost */
<------><------><------><------>dev->stats.tx_carrier_errors++;
 
<------><------><------>if (sc & (BD_ENET_TX_LC | BD_ENET_TX_RL | BD_ENET_TX_UN)) {
<------><------><------><------>dev->stats.tx_errors++;
<------><------><------><------>do_restart = 1;
<------><------><------>}
<------><------>} else
<------><------><------>dev->stats.tx_packets++;
 
<------><------>if (sc & BD_ENET_TX_READY) {
<------><------><------>dev_warn(fep->dev,
<------><------><------><------> "HEY! Enet xmit interrupt and TX_READY.\n");
<------><------>}
 
<------><------>/*
<------><------> * Deferred means some collisions occurred during transmit,
<------><------> * but we eventually sent the packet OK.
<------><------> */
<------><------>if (sc & BD_ENET_TX_DEF)
<------><------><------>dev->stats.collisions++;
 
<------><------>/* unmap */
<------><------>if (fep->mapped_as_page[dirtyidx])
<------><------><------>dma_unmap_page(fep->dev, CBDR_BUFADDR(bdp),
<------><------><------><------>       CBDR_DATLEN(bdp), DMA_TO_DEVICE);
<------><------>else
<------><------><------>dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
<------><------><------><------><------> CBDR_DATLEN(bdp), DMA_TO_DEVICE);
 
<------><------>/*
<------><------> * Free the sk buffer associated with this last transmit.
<------><------> */
<------><------>if (skb) {
<------><------><------>dev_kfree_skb(skb);
<------><------><------>fep->tx_skbuff[dirtyidx] = NULL;
<------><------>}
 
<------><------>/*
<------><------> * Update pointer to next buffer descriptor to be transmitted.
<------><------> */
<------><------>if ((sc & BD_ENET_TX_WRAP) == 0)
<------><------><------>bdp++;
<------><------>else
<------><------><------>bdp = fep->tx_bd_base;
 
<------><------>/*
<------><------> * Since we have freed up a buffer, the ring is no longer
<------><------> * full.
<------><------> */
<------><------>if (++fep->tx_free == MAX_SKB_FRAGS)
<------><------><------>do_wake = 1;
<------><------>tx_left--;
<------>}
 
<------>fep->dirty_tx = bdp;
 
<------>if (do_restart)
<------><------>(*fep->ops->tx_restart)(dev);
 
<------>spin_unlock(&fep->tx_lock);
 
<------>if (do_wake)
<------><------>netif_wake_queue(dev);
 
<------>/*
<------> * First, grab all of the stats for the incoming packet.
<------> * These get messed up if we get called due to a busy condition.
<------> */
<------>bdp = fep->cur_rx;
 
<------>while (((sc = CBDR_SC(bdp)) & BD_ENET_RX_EMPTY) == 0 &&
<------>       received < budget) {
<------><------>curidx = bdp - fep->rx_bd_base;
 
<------><------>/*
<------><------> * Since we have allocated space to hold a complete frame,
<------><------> * the last indicator should be set.
<------><------> */
<------><------>if ((sc & BD_ENET_RX_LAST) == 0)
<------><------><------>dev_warn(fep->dev, "rcv is not +last\n");
 
<------><------>/*
<------><------> * Check for errors.
<------><------> */
<------><------>if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH | BD_ENET_RX_CL |
<------><------><------>  BD_ENET_RX_NO | BD_ENET_RX_CR | BD_ENET_RX_OV)) {
<------><------><------>dev->stats.rx_errors++;
<------><------><------>/* Frame too long or too short. */
<------><------><------>if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH))
<------><------><------><------>dev->stats.rx_length_errors++;
<------><------><------>/* Frame alignment */
<------><------><------>if (sc & (BD_ENET_RX_NO | BD_ENET_RX_CL))
<------><------><------><------>dev->stats.rx_frame_errors++;
<------><------><------>/* CRC Error */
<------><------><------>if (sc & BD_ENET_RX_CR)
<------><------><------><------>dev->stats.rx_crc_errors++;
<------><------><------>/* FIFO overrun */
<------><------><------>if (sc & BD_ENET_RX_OV)
<------><------><------><------>dev->stats.rx_crc_errors++;
 
<------><------><------>skbn = fep->rx_skbuff[curidx];
<------><------>} else {
<------><------><------>skb = fep->rx_skbuff[curidx];
 
<------><------><------>/*
<------><------><------> * Process the incoming frame.
<------><------><------> */
<------><------><------>dev->stats.rx_packets++;
<------><------><------>pkt_len = CBDR_DATLEN(bdp) - 4;	/* remove CRC */
<------><------><------>dev->stats.rx_bytes += pkt_len + 4;
 
<------><------><------>if (pkt_len <= fpi->rx_copybreak) {
<------><------><------><------>/* +2 to make IP header L1 cache aligned */
<------><------><------><------>skbn = netdev_alloc_skb(dev, pkt_len + 2);
<------><------><------><------>if (skbn != NULL) {
<------><------><------><------><------>skb_reserve(skbn, 2);	/* align IP header */
<------><------><------><------><------>skb_copy_from_linear_data(skb,
<------><------><------><------><------><------>      skbn->data, pkt_len);
<------><------><------><------><------>swap(skb, skbn);
<------><------><------><------><------>dma_sync_single_for_cpu(fep->dev,
<------><------><------><------><------><------>CBDR_BUFADDR(bdp),
<------><------><------><------><------><------>L1_CACHE_ALIGN(pkt_len),
<------><------><------><------><------><------>DMA_FROM_DEVICE);
<------><------><------><------>}
<------><------><------>} else {
<------><------><------><------>skbn = netdev_alloc_skb(dev, ENET_RX_FRSIZE);
 
<------><------><------><------>if (skbn) {
<------><------><------><------><------>dma_addr_t dma;
 
<------><------><------><------><------>skb_align(skbn, ENET_RX_ALIGN);
 
<------><------><------><------><------>dma_unmap_single(fep->dev,
<------><------><------><------><------><------>CBDR_BUFADDR(bdp),
<------><------><------><------><------><------>L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
<------><------><------><------><------><------>DMA_FROM_DEVICE);
 
<------><------><------><------><------>dma = dma_map_single(fep->dev,
<------><------><------><------><------><------>skbn->data,
<------><------><------><------><------><------>L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
<------><------><------><------><------><------>DMA_FROM_DEVICE);
<------><------><------><------><------>CBDW_BUFADDR(bdp, dma);
<------><------><------><------>}
<------><------><------>}
 
<------><------><------>if (skbn != NULL) {
<------><------><------><------>skb_put(skb, pkt_len);	/* Make room */
<------><------><------><------>skb->protocol = eth_type_trans(skb, dev);
<------><------><------><------>received++;
<------><------><------><------>netif_receive_skb(skb);
<------><------><------>} else {
<------><------><------><------>dev->stats.rx_dropped++;
<------><------><------><------>skbn = skb;
<------><------><------>}
<------><------>}
 
<------><------>fep->rx_skbuff[curidx] = skbn;
<------><------>CBDW_DATLEN(bdp, 0);
<------><------>CBDW_SC(bdp, (sc & ~BD_ENET_RX_STATS) | BD_ENET_RX_EMPTY);
 
<------><------>/*
<------><------> * Update BD pointer to next entry.
<------><------> */
<------><------>if ((sc & BD_ENET_RX_WRAP) == 0)
<------><------><------>bdp++;
<------><------>else
<------><------><------>bdp = fep->rx_bd_base;
 
<------><------>(*fep->ops->rx_bd_done)(dev);
<------>}
 
<------>fep->cur_rx = bdp;
 
<------>if (received < budget && tx_left) {
<------><------>/* done */
<------><------>napi_complete_done(napi, received);
<------><------>(*fep->ops->napi_enable)(dev);
 
<------><------>return received;
<------>}
 
<------>return budget;
}
 
/*
 * The interrupt handler.
 * This is called from the MPC core interrupt.
 */
static irqreturn_t
fs_enet_interrupt(int irq, void *dev_id)
{
<------>struct net_device *dev = dev_id;
<------>struct fs_enet_private *fep;
<------>const struct fs_platform_info *fpi;
<------>u32 int_events;
<------>u32 int_clr_events;
<------>int nr, napi_ok;
<------>int handled;
 
<------>fep = netdev_priv(dev);
<------>fpi = fep->fpi;
 
<------>nr = 0;
<------>while ((int_events = (*fep->ops->get_int_events)(dev)) != 0) {
<------><------>nr++;
 
<------><------>int_clr_events = int_events;
<------><------>int_clr_events &= ~fep->ev_napi;
 
<------><------>(*fep->ops->clear_int_events)(dev, int_clr_events);
 
<------><------>if (int_events & fep->ev_err)
<------><------><------>(*fep->ops->ev_error)(dev, int_events);
 
<------><------>if (int_events & fep->ev) {
<------><------><------>napi_ok = napi_schedule_prep(&fep->napi);
 
<------><------><------>(*fep->ops->napi_disable)(dev);
<------><------><------>(*fep->ops->clear_int_events)(dev, fep->ev_napi);
 
<------><------><------>/* NOTE: it is possible for FCCs in NAPI mode    */
<------><------><------>/* to submit a spurious interrupt while in poll  */
<------><------><------>if (napi_ok)
<------><------><------><------>__napi_schedule(&fep->napi);
<------><------>}
 
<------>}
 
<------>handled = nr > 0;
<------>return IRQ_RETVAL(handled);
}
 
void fs_init_bds(struct net_device *dev)
{
<------>struct fs_enet_private *fep = netdev_priv(dev);
<------>cbd_t __iomem *bdp;
<------>struct sk_buff *skb;
<------>int i;
 
<------>fs_cleanup_bds(dev);
 
<------>fep->dirty_tx = fep->cur_tx = fep->tx_bd_base;
<------>fep->tx_free = fep->tx_ring;
<------>fep->cur_rx = fep->rx_bd_base;
 
<------>/*
<------> * Initialize the receive buffer descriptors.
<------> */
<------>for (i = 0, bdp = fep->rx_bd_base; i < fep->rx_ring; i++, bdp++) {
<------><------>skb = netdev_alloc_skb(dev, ENET_RX_FRSIZE);
<------><------>if (skb == NULL)
<------><------><------>break;
 
<------><------>skb_align(skb, ENET_RX_ALIGN);
<------><------>fep->rx_skbuff[i] = skb;
<------><------>CBDW_BUFADDR(bdp,
<------><------><------>dma_map_single(fep->dev, skb->data,
<------><------><------><------>L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
<------><------><------><------>DMA_FROM_DEVICE));
<------><------>CBDW_DATLEN(bdp, 0);	/* zero */
<------><------>CBDW_SC(bdp, BD_ENET_RX_EMPTY |
<------><------><------>((i < fep->rx_ring - 1) ? 0 : BD_SC_WRAP));
<------>}
<------>/*
<------> * if we failed, fillup remainder
<------> */
<------>for (; i < fep->rx_ring; i++, bdp++) {
<------><------>fep->rx_skbuff[i] = NULL;
<------><------>CBDW_SC(bdp, (i < fep->rx_ring - 1) ? 0 : BD_SC_WRAP);
<------>}
 
<------>/*
<------> * ...and the same for transmit.
<------> */
<------>for (i = 0, bdp = fep->tx_bd_base; i < fep->tx_ring; i++, bdp++) {
<------><------>fep->tx_skbuff[i] = NULL;
<------><------>CBDW_BUFADDR(bdp, 0);
<------><------>CBDW_DATLEN(bdp, 0);
<------><------>CBDW_SC(bdp, (i < fep->tx_ring - 1) ? 0 : BD_SC_WRAP);
<------>}
}
 
void fs_cleanup_bds(struct net_device *dev)
{
<------>struct fs_enet_private *fep = netdev_priv(dev);
<------>struct sk_buff *skb;
<------>cbd_t __iomem *bdp;
<------>int i;
 
<------>/*
<------> * Reset SKB transmit buffers.
<------> */
<------>for (i = 0, bdp = fep->tx_bd_base; i < fep->tx_ring; i++, bdp++) {
<------><------>if ((skb = fep->tx_skbuff[i]) == NULL)
<------><------><------>continue;
 
<------><------>/* unmap */
<------><------>dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
<------><------><------><------>skb->len, DMA_TO_DEVICE);
 
<------><------>fep->tx_skbuff[i] = NULL;
<------><------>dev_kfree_skb(skb);
<------>}
 
<------>/*
<------> * Reset SKB receive buffers
<------> */
<------>for (i = 0, bdp = fep->rx_bd_base; i < fep->rx_ring; i++, bdp++) {
<------><------>if ((skb = fep->rx_skbuff[i]) == NULL)
<------><------><------>continue;
 
<------><------>/* unmap */
<------><------>dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
<------><------><------>L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
<------><------><------>DMA_FROM_DEVICE);
 
<------><------>fep->rx_skbuff[i] = NULL;
 
<------><------>dev_kfree_skb(skb);
<------>}
}
 
/**********************************************************************************/
 
#ifdef CONFIG_FS_ENET_MPC5121_FEC
/*
 * MPC5121 FEC requeries 4-byte alignment for TX data buffer!
 */
static struct sk_buff *tx_skb_align_workaround(struct net_device *dev,
<------><------><------><------><------>       struct sk_buff *skb)
{
<------>struct sk_buff *new_skb;
 
<------>if (skb_linearize(skb))
<------><------>return NULL;
 
<------>/* Alloc new skb */
<------>new_skb = netdev_alloc_skb(dev, skb->len + 4);
<------>if (!new_skb)
<------><------>return NULL;
 
<------>/* Make sure new skb is properly aligned */
<------>skb_align(new_skb, 4);
 
<------>/* Copy data to new skb ... */
<------>skb_copy_from_linear_data(skb, new_skb->data, skb->len);
<------>skb_put(new_skb, skb->len);
 
<------>/* ... and free an old one */
<------>dev_kfree_skb_any(skb);
 
<------>return new_skb;
}
#endif
 
static netdev_tx_t
fs_enet_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
<------>struct fs_enet_private *fep = netdev_priv(dev);
<------>cbd_t __iomem *bdp;
<------>int curidx;
<------>u16 sc;
<------>int nr_frags;
<------>skb_frag_t *frag;
<------>int len;
#ifdef CONFIG_FS_ENET_MPC5121_FEC
<------>int is_aligned = 1;
<------>int i;
 
<------>if (!IS_ALIGNED((unsigned long)skb->data, 4)) {
<------><------>is_aligned = 0;
<------>} else {
<------><------>nr_frags = skb_shinfo(skb)->nr_frags;
<------><------>frag = skb_shinfo(skb)->frags;
<------><------>for (i = 0; i < nr_frags; i++, frag++) {
<------><------><------>if (!IS_ALIGNED(skb_frag_off(frag), 4)) {
<------><------><------><------>is_aligned = 0;
<------><------><------><------>break;
<------><------><------>}
<------><------>}
<------>}
 
<------>if (!is_aligned) {
<------><------>skb = tx_skb_align_workaround(dev, skb);
<------><------>if (!skb) {
<------><------><------>/*
<------><------><------> * We have lost packet due to memory allocation error
<------><------><------> * in tx_skb_align_workaround(). Hopefully original
<------><------><------> * skb is still valid, so try transmit it later.
<------><------><------> */
<------><------><------>return NETDEV_TX_BUSY;
<------><------>}
<------>}
#endif
 
<------>spin_lock(&fep->tx_lock);
 
<------>/*
<------> * Fill in a Tx ring entry
<------> */
<------>bdp = fep->cur_tx;
 
<------>nr_frags = skb_shinfo(skb)->nr_frags;
<------>if (fep->tx_free <= nr_frags || (CBDR_SC(bdp) & BD_ENET_TX_READY)) {
<------><------>netif_stop_queue(dev);
<------><------>spin_unlock(&fep->tx_lock);
 
<------><------>/*
<------><------> * Ooops.  All transmit buffers are full.  Bail out.
<------><------> * This should not happen, since the tx queue should be stopped.
<------><------> */
<------><------>dev_warn(fep->dev, "tx queue full!.\n");
<------><------>return NETDEV_TX_BUSY;
<------>}
 
<------>curidx = bdp - fep->tx_bd_base;
 
<------>len = skb->len;
<------>dev->stats.tx_bytes += len;
<------>if (nr_frags)
<------><------>len -= skb->data_len;
<------>fep->tx_free -= nr_frags + 1;
<------>/*
<------> * Push the data cache so the CPM does not get stale memory data.
<------> */
<------>CBDW_BUFADDR(bdp, dma_map_single(fep->dev,
<------><------><------><------>skb->data, len, DMA_TO_DEVICE));
<------>CBDW_DATLEN(bdp, len);
 
<------>fep->mapped_as_page[curidx] = 0;
<------>frag = skb_shinfo(skb)->frags;
<------>while (nr_frags) {
<------><------>CBDC_SC(bdp,
<------><------><------>BD_ENET_TX_STATS | BD_ENET_TX_INTR | BD_ENET_TX_LAST |
<------><------><------>BD_ENET_TX_TC);
<------><------>CBDS_SC(bdp, BD_ENET_TX_READY);
 
<------><------>if ((CBDR_SC(bdp) & BD_ENET_TX_WRAP) == 0) {
<------><------><------>bdp++;
<------><------><------>curidx++;
<------><------>} else {
<------><------><------>bdp = fep->tx_bd_base;
<------><------><------>curidx = 0;
<------><------>}
 
<------><------>len = skb_frag_size(frag);
<------><------>CBDW_BUFADDR(bdp, skb_frag_dma_map(fep->dev, frag, 0, len,
<------><------><------><------><------><------>   DMA_TO_DEVICE));
<------><------>CBDW_DATLEN(bdp, len);
 
<------><------>fep->tx_skbuff[curidx] = NULL;
<------><------>fep->mapped_as_page[curidx] = 1;
 
<------><------>frag++;
<------><------>nr_frags--;
<------>}
 
<------>/* Trigger transmission start */
<------>sc = BD_ENET_TX_READY | BD_ENET_TX_INTR |
<------>     BD_ENET_TX_LAST | BD_ENET_TX_TC;
 
<------>/* note that while FEC does not have this bit
<------> * it marks it as available for software use
<------> * yay for hw reuse :) */
<------>if (skb->len <= 60)
<------><------>sc |= BD_ENET_TX_PAD;
<------>CBDC_SC(bdp, BD_ENET_TX_STATS);
<------>CBDS_SC(bdp, sc);
 
<------>/* Save skb pointer. */
<------>fep->tx_skbuff[curidx] = skb;
 
<------>/* If this was the last BD in the ring, start at the beginning again. */
<------>if ((CBDR_SC(bdp) & BD_ENET_TX_WRAP) == 0)
<------><------>bdp++;
<------>else
<------><------>bdp = fep->tx_bd_base;
<------>fep->cur_tx = bdp;
 
<------>if (fep->tx_free < MAX_SKB_FRAGS)
<------><------>netif_stop_queue(dev);
 
<------>skb_tx_timestamp(skb);
 
<------>(*fep->ops->tx_kickstart)(dev);
 
<------>spin_unlock(&fep->tx_lock);
 
<------>return NETDEV_TX_OK;
}
 
static void fs_timeout_work(struct work_struct *work)
{
<------>struct fs_enet_private *fep = container_of(work, struct fs_enet_private,
<------><------><------><------><------><------>   timeout_work);
<------>struct net_device *dev = fep->ndev;
<------>unsigned long flags;
<------>int wake = 0;
 
<------>dev->stats.tx_errors++;
 
<------>spin_lock_irqsave(&fep->lock, flags);
 
<------>if (dev->flags & IFF_UP) {
<------><------>phy_stop(dev->phydev);
<------><------>(*fep->ops->stop)(dev);
<------><------>(*fep->ops->restart)(dev);
<------>}
 
<------>phy_start(dev->phydev);
<------>wake = fep->tx_free >= MAX_SKB_FRAGS &&
<------>       !(CBDR_SC(fep->cur_tx) & BD_ENET_TX_READY);
<------>spin_unlock_irqrestore(&fep->lock, flags);
 
<------>if (wake)
<------><------>netif_wake_queue(dev);
}
 
static void fs_timeout(struct net_device *dev, unsigned int txqueue)
{
<------>struct fs_enet_private *fep = netdev_priv(dev);
 
<------>schedule_work(&fep->timeout_work);
}
 
/*-----------------------------------------------------------------------------
 *  generic link-change handler - should be sufficient for most cases
 *-----------------------------------------------------------------------------*/
static void generic_adjust_link(struct  net_device *dev)
{
<------>struct fs_enet_private *fep = netdev_priv(dev);
<------>struct phy_device *phydev = dev->phydev;
<------>int new_state = 0;
 
<------>if (phydev->link) {
<------><------>/* adjust to duplex mode */
<------><------>if (phydev->duplex != fep->oldduplex) {
<------><------><------>new_state = 1;
<------><------><------>fep->oldduplex = phydev->duplex;
<------><------>}
 
<------><------>if (phydev->speed != fep->oldspeed) {
<------><------><------>new_state = 1;
<------><------><------>fep->oldspeed = phydev->speed;
<------><------>}
 
<------><------>if (!fep->oldlink) {
<------><------><------>new_state = 1;
<------><------><------>fep->oldlink = 1;
<------><------>}
 
<------><------>if (new_state)
<------><------><------>fep->ops->restart(dev);
<------>} else if (fep->oldlink) {
<------><------>new_state = 1;
<------><------>fep->oldlink = 0;
<------><------>fep->oldspeed = 0;
<------><------>fep->oldduplex = -1;
<------>}
 
<------>if (new_state && netif_msg_link(fep))
<------><------>phy_print_status(phydev);
}
 
 
static void fs_adjust_link(struct net_device *dev)
{
<------>struct fs_enet_private *fep = netdev_priv(dev);
<------>unsigned long flags;
 
<------>spin_lock_irqsave(&fep->lock, flags);
 
<------>if(fep->ops->adjust_link)
<------><------>fep->ops->adjust_link(dev);
<------>else
<------><------>generic_adjust_link(dev);
 
<------>spin_unlock_irqrestore(&fep->lock, flags);
}
 
static int fs_init_phy(struct net_device *dev)
{
<------>struct fs_enet_private *fep = netdev_priv(dev);
<------>struct phy_device *phydev;
<------>phy_interface_t iface;
 
<------>fep->oldlink = 0;
<------>fep->oldspeed = 0;
<------>fep->oldduplex = -1;
 
<------>iface = fep->fpi->use_rmii ?
<------><------>PHY_INTERFACE_MODE_RMII : PHY_INTERFACE_MODE_MII;
 
<------>phydev = of_phy_connect(dev, fep->fpi->phy_node, &fs_adjust_link, 0,
<------><------><------><------>iface);
<------>if (!phydev) {
<------><------>dev_err(&dev->dev, "Could not attach to PHY\n");
<------><------>return -ENODEV;
<------>}
 
<------>return 0;
}
 
static int fs_enet_open(struct net_device *dev)
{
<------>struct fs_enet_private *fep = netdev_priv(dev);
<------>int r;
<------>int err;
 
<------>/* to initialize the fep->cur_rx,... */
<------>/* not doing this, will cause a crash in fs_enet_napi */
<------>fs_init_bds(fep->ndev);
 
<------>napi_enable(&fep->napi);
 
<------>/* Install our interrupt handler. */
<------>r = request_irq(fep->interrupt, fs_enet_interrupt, IRQF_SHARED,
<------><------><------>"fs_enet-mac", dev);
<------>if (r != 0) {
<------><------>dev_err(fep->dev, "Could not allocate FS_ENET IRQ!");
<------><------>napi_disable(&fep->napi);
<------><------>return -EINVAL;
<------>}
 
<------>err = fs_init_phy(dev);
<------>if (err) {
<------><------>free_irq(fep->interrupt, dev);
<------><------>napi_disable(&fep->napi);
<------><------>return err;
<------>}
<------>phy_start(dev->phydev);
 
<------>netif_start_queue(dev);
 
<------>return 0;
}
 
static int fs_enet_close(struct net_device *dev)
{
<------>struct fs_enet_private *fep = netdev_priv(dev);
<------>unsigned long flags;
 
<------>netif_stop_queue(dev);
<------>netif_carrier_off(dev);
<------>napi_disable(&fep->napi);
<------>cancel_work_sync(&fep->timeout_work);
<------>phy_stop(dev->phydev);
 
<------>spin_lock_irqsave(&fep->lock, flags);
<------>spin_lock(&fep->tx_lock);
<------>(*fep->ops->stop)(dev);
<------>spin_unlock(&fep->tx_lock);
<------>spin_unlock_irqrestore(&fep->lock, flags);
 
<------>/* release any irqs */
<------>phy_disconnect(dev->phydev);
<------>free_irq(fep->interrupt, dev);
 
<------>return 0;
}
 
/*************************************************************************/
 
static void fs_get_drvinfo(struct net_device *dev,
<------><------><------>    struct ethtool_drvinfo *info)
{
<------>strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
}
 
static int fs_get_regs_len(struct net_device *dev)
{
<------>struct fs_enet_private *fep = netdev_priv(dev);
 
<------>return (*fep->ops->get_regs_len)(dev);
}
 
static void fs_get_regs(struct net_device *dev, struct ethtool_regs *regs,
<------><------><------> void *p)
{
<------>struct fs_enet_private *fep = netdev_priv(dev);
<------>unsigned long flags;
<------>int r, len;
 
<------>len = regs->len;
 
<------>spin_lock_irqsave(&fep->lock, flags);
<------>r = (*fep->ops->get_regs)(dev, p, &len);
<------>spin_unlock_irqrestore(&fep->lock, flags);
 
<------>if (r == 0)
<------><------>regs->version = 0;
}
 
static u32 fs_get_msglevel(struct net_device *dev)
{
<------>struct fs_enet_private *fep = netdev_priv(dev);
<------>return fep->msg_enable;
}
 
static void fs_set_msglevel(struct net_device *dev, u32 value)
{
<------>struct fs_enet_private *fep = netdev_priv(dev);
<------>fep->msg_enable = value;
}
 
static int fs_get_tunable(struct net_device *dev,
<------><------><------>  const struct ethtool_tunable *tuna, void *data)
{
<------>struct fs_enet_private *fep = netdev_priv(dev);
<------>struct fs_platform_info *fpi = fep->fpi;
<------>int ret = 0;
 
<------>switch (tuna->id) {
<------>case ETHTOOL_RX_COPYBREAK:
<------><------>*(u32 *)data = fpi->rx_copybreak;
<------><------>break;
<------>default:
<------><------>ret = -EINVAL;
<------><------>break;
<------>}
 
<------>return ret;
}
 
static int fs_set_tunable(struct net_device *dev,
<------><------><------>  const struct ethtool_tunable *tuna, const void *data)
{
<------>struct fs_enet_private *fep = netdev_priv(dev);
<------>struct fs_platform_info *fpi = fep->fpi;
<------>int ret = 0;
 
<------>switch (tuna->id) {
<------>case ETHTOOL_RX_COPYBREAK:
<------><------>fpi->rx_copybreak = *(u32 *)data;
<------><------>break;
<------>default:
<------><------>ret = -EINVAL;
<------><------>break;
<------>}
 
<------>return ret;
}
 
static const struct ethtool_ops fs_ethtool_ops = {
<------>.get_drvinfo = fs_get_drvinfo,
<------>.get_regs_len = fs_get_regs_len,
<------>.nway_reset = phy_ethtool_nway_reset,
<------>.get_link = ethtool_op_get_link,
<------>.get_msglevel = fs_get_msglevel,
<------>.set_msglevel = fs_set_msglevel,
<------>.get_regs = fs_get_regs,
<------>.get_ts_info = ethtool_op_get_ts_info,
<------>.get_link_ksettings = phy_ethtool_get_link_ksettings,
<------>.set_link_ksettings = phy_ethtool_set_link_ksettings,
<------>.get_tunable = fs_get_tunable,
<------>.set_tunable = fs_set_tunable,
};
 
extern int fs_mii_connect(struct net_device *dev);
extern void fs_mii_disconnect(struct net_device *dev);
 
/**************************************************************************************/
 
#ifdef CONFIG_FS_ENET_HAS_FEC
#define IS_FEC(match) ((match)->data == &fs_fec_ops)
#else
#define IS_FEC(match) 0
#endif
 
static const struct net_device_ops fs_enet_netdev_ops = {
<------>.ndo_open		= fs_enet_open,
<------>.ndo_stop		= fs_enet_close,
<------>.ndo_start_xmit		= fs_enet_start_xmit,
<------>.ndo_tx_timeout		= fs_timeout,
<------>.ndo_set_rx_mode	= fs_set_multicast_list,
<------>.ndo_do_ioctl		= phy_do_ioctl_running,
<------>.ndo_validate_addr	= eth_validate_addr,
<------>.ndo_set_mac_address	= eth_mac_addr,
#ifdef CONFIG_NET_POLL_CONTROLLER
<------>.ndo_poll_controller	= fs_enet_netpoll,
#endif
};
 
static const struct of_device_id fs_enet_match[];
static int fs_enet_probe(struct platform_device *ofdev)
{
<------>const struct of_device_id *match;
<------>struct net_device *ndev;
<------>struct fs_enet_private *fep;
<------>struct fs_platform_info *fpi;
<------>const u32 *data;
<------>struct clk *clk;
<------>int err;
<------>const u8 *mac_addr;
<------>const char *phy_connection_type;
<------>int privsize, len, ret = -ENODEV;
 
<------>match = of_match_device(fs_enet_match, &ofdev->dev);
<------>if (!match)
<------><------>return -EINVAL;
 
<------>fpi = kzalloc(sizeof(*fpi), GFP_KERNEL);
<------>if (!fpi)
<------><------>return -ENOMEM;
 
<------>if (!IS_FEC(match)) {
<------><------>data = of_get_property(ofdev->dev.of_node, "fsl,cpm-command", &len);
<------><------>if (!data || len != 4)
<------><------><------>goto out_free_fpi;
 
<------><------>fpi->cp_command = *data;
<------>}
 
<------>fpi->rx_ring = RX_RING_SIZE;
<------>fpi->tx_ring = TX_RING_SIZE;
<------>fpi->rx_copybreak = 240;
<------>fpi->napi_weight = 17;
<------>fpi->phy_node = of_parse_phandle(ofdev->dev.of_node, "phy-handle", 0);
<------>if (!fpi->phy_node && of_phy_is_fixed_link(ofdev->dev.of_node)) {
<------><------>err = of_phy_register_fixed_link(ofdev->dev.of_node);
<------><------>if (err)
<------><------><------>goto out_free_fpi;
 
<------><------>/* In the case of a fixed PHY, the DT node associated
<------><------> * to the PHY is the Ethernet MAC DT node.
<------><------> */
<------><------>fpi->phy_node = of_node_get(ofdev->dev.of_node);
<------>}
 
<------>if (of_device_is_compatible(ofdev->dev.of_node, "fsl,mpc5125-fec")) {
<------><------>phy_connection_type = of_get_property(ofdev->dev.of_node,
<------><------><------><------><------><------>"phy-connection-type", NULL);
<------><------>if (phy_connection_type && !strcmp("rmii", phy_connection_type))
<------><------><------>fpi->use_rmii = 1;
<------>}
 
<------>/* make clock lookup non-fatal (the driver is shared among platforms),
<------> * but require enable to succeed when a clock was specified/found,
<------> * keep a reference to the clock upon successful acquisition
<------> */
<------>clk = devm_clk_get(&ofdev->dev, "per");
<------>if (!IS_ERR(clk)) {
<------><------>ret = clk_prepare_enable(clk);
<------><------>if (ret)
<------><------><------>goto out_deregister_fixed_link;
 
<------><------>fpi->clk_per = clk;
<------>}
 
<------>privsize = sizeof(*fep) +
<------>           sizeof(struct sk_buff **) *
<------><------>     (fpi->rx_ring + fpi->tx_ring) +
<------><------>   sizeof(char) * fpi->tx_ring;
 
<------>ndev = alloc_etherdev(privsize);
<------>if (!ndev) {
<------><------>ret = -ENOMEM;
<------><------>goto out_put;
<------>}
 
<------>SET_NETDEV_DEV(ndev, &ofdev->dev);
<------>platform_set_drvdata(ofdev, ndev);
 
<------>fep = netdev_priv(ndev);
<------>fep->dev = &ofdev->dev;
<------>fep->ndev = ndev;
<------>fep->fpi = fpi;
<------>fep->ops = match->data;
 
<------>ret = fep->ops->setup_data(ndev);
<------>if (ret)
<------><------>goto out_free_dev;
 
<------>fep->rx_skbuff = (struct sk_buff **)&fep[1];
<------>fep->tx_skbuff = fep->rx_skbuff + fpi->rx_ring;
<------>fep->mapped_as_page = (char *)(fep->rx_skbuff + fpi->rx_ring +
<------><------><------><------>       fpi->tx_ring);
 
<------>spin_lock_init(&fep->lock);
<------>spin_lock_init(&fep->tx_lock);
 
<------>mac_addr = of_get_mac_address(ofdev->dev.of_node);
<------>if (!IS_ERR(mac_addr))
<------><------>ether_addr_copy(ndev->dev_addr, mac_addr);
 
<------>ret = fep->ops->allocate_bd(ndev);
<------>if (ret)
<------><------>goto out_cleanup_data;
 
<------>fep->rx_bd_base = fep->ring_base;
<------>fep->tx_bd_base = fep->rx_bd_base + fpi->rx_ring;
 
<------>fep->tx_ring = fpi->tx_ring;
<------>fep->rx_ring = fpi->rx_ring;
 
<------>ndev->netdev_ops = &fs_enet_netdev_ops;
<------>ndev->watchdog_timeo = 2 * HZ;
<------>INIT_WORK(&fep->timeout_work, fs_timeout_work);
<------>netif_napi_add(ndev, &fep->napi, fs_enet_napi, fpi->napi_weight);
 
<------>ndev->ethtool_ops = &fs_ethtool_ops;
 
<------>netif_carrier_off(ndev);
 
<------>ndev->features |= NETIF_F_SG;
 
<------>ret = register_netdev(ndev);
<------>if (ret)
<------><------>goto out_free_bd;
 
<------>pr_info("%s: fs_enet: %pM\n", ndev->name, ndev->dev_addr);
 
<------>return 0;
 
out_free_bd:
<------>fep->ops->free_bd(ndev);
out_cleanup_data:
<------>fep->ops->cleanup_data(ndev);
out_free_dev:
<------>free_netdev(ndev);
out_put:
<------>clk_disable_unprepare(fpi->clk_per);
out_deregister_fixed_link:
<------>of_node_put(fpi->phy_node);
<------>if (of_phy_is_fixed_link(ofdev->dev.of_node))
<------><------>of_phy_deregister_fixed_link(ofdev->dev.of_node);
out_free_fpi:
<------>kfree(fpi);
<------>return ret;
}
 
static int fs_enet_remove(struct platform_device *ofdev)
{
<------>struct net_device *ndev = platform_get_drvdata(ofdev);
<------>struct fs_enet_private *fep = netdev_priv(ndev);
 
<------>unregister_netdev(ndev);
 
<------>fep->ops->free_bd(ndev);
<------>fep->ops->cleanup_data(ndev);
<------>dev_set_drvdata(fep->dev, NULL);
<------>of_node_put(fep->fpi->phy_node);
<------>clk_disable_unprepare(fep->fpi->clk_per);
<------>if (of_phy_is_fixed_link(ofdev->dev.of_node))
<------><------>of_phy_deregister_fixed_link(ofdev->dev.of_node);
<------>free_netdev(ndev);
<------>return 0;
}
 
static const struct of_device_id fs_enet_match[] = {
#ifdef CONFIG_FS_ENET_HAS_SCC
<------>{
<------><------>.compatible = "fsl,cpm1-scc-enet",
<------><------>.data = (void *)&fs_scc_ops,
<------>},
<------>{
<------><------>.compatible = "fsl,cpm2-scc-enet",
<------><------>.data = (void *)&fs_scc_ops,
<------>},
#endif
#ifdef CONFIG_FS_ENET_HAS_FCC
<------>{
<------><------>.compatible = "fsl,cpm2-fcc-enet",
<------><------>.data = (void *)&fs_fcc_ops,
<------>},
#endif
#ifdef CONFIG_FS_ENET_HAS_FEC
#ifdef CONFIG_FS_ENET_MPC5121_FEC
<------>{
<------><------>.compatible = "fsl,mpc5121-fec",
<------><------>.data = (void *)&fs_fec_ops,
<------>},
<------>{
<------><------>.compatible = "fsl,mpc5125-fec",
<------><------>.data = (void *)&fs_fec_ops,
<------>},
#else
<------>{
<------><------>.compatible = "fsl,pq1-fec-enet",
<------><------>.data = (void *)&fs_fec_ops,
<------>},
#endif
#endif
<------>{}
};
MODULE_DEVICE_TABLE(of, fs_enet_match);
 
static struct platform_driver fs_enet_driver = {
<------>.driver = {
<------><------>.name = "fs_enet",
<------><------>.of_match_table = fs_enet_match,
<------>},
<------>.probe = fs_enet_probe,
<------>.remove = fs_enet_remove,
};
 
#ifdef CONFIG_NET_POLL_CONTROLLER
static void fs_enet_netpoll(struct net_device *dev)
{
       disable_irq(dev->irq);
       fs_enet_interrupt(dev->irq, dev);
       enable_irq(dev->irq);
}
#endif
 
module_platform_driver(fs_enet_driver);