// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Driver for BCM963xx builtin Ethernet mac
*
* Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
*/
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/clk.h>
#include <linux/etherdevice.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/ethtool.h>
#include <linux/crc32.h>
#include <linux/err.h>
#include <linux/dma-mapping.h>
#include <linux/platform_device.h>
#include <linux/if_vlan.h>
#include <bcm63xx_dev_enet.h>
#include "bcm63xx_enet.h"
static char bcm_enet_driver_name[] = "bcm63xx_enet";
static int copybreak __read_mostly = 128;
module_param(copybreak, int, 0);
MODULE_PARM_DESC(copybreak, "Receive copy threshold");
/* io registers memory shared between all devices */
static void __iomem *bcm_enet_shared_base[3];
/*
* io helpers to access mac registers
*/
static inline u32 enet_readl(struct bcm_enet_priv *priv, u32 off)
{
return bcm_readl(priv->base + off);
}
static inline void enet_writel(struct bcm_enet_priv *priv,
u32 val, u32 off)
{
bcm_writel(val, priv->base + off);
}
/*
* io helpers to access switch registers
*/
static inline u32 enetsw_readl(struct bcm_enet_priv *priv, u32 off)
{
return bcm_readl(priv->base + off);
}
static inline void enetsw_writel(struct bcm_enet_priv *priv,
u32 val, u32 off)
{
bcm_writel(val, priv->base + off);
}
static inline u16 enetsw_readw(struct bcm_enet_priv *priv, u32 off)
{
return bcm_readw(priv->base + off);
}
static inline void enetsw_writew(struct bcm_enet_priv *priv,
u16 val, u32 off)
{
bcm_writew(val, priv->base + off);
}
static inline u8 enetsw_readb(struct bcm_enet_priv *priv, u32 off)
{
return bcm_readb(priv->base + off);
}
static inline void enetsw_writeb(struct bcm_enet_priv *priv,
u8 val, u32 off)
{
bcm_writeb(val, priv->base + off);
}
/* io helpers to access shared registers */
static inline u32 enet_dma_readl(struct bcm_enet_priv *priv, u32 off)
{
return bcm_readl(bcm_enet_shared_base[0] + off);
}
static inline void enet_dma_writel(struct bcm_enet_priv *priv,
u32 val, u32 off)
{
bcm_writel(val, bcm_enet_shared_base[0] + off);
}
static inline u32 enet_dmac_readl(struct bcm_enet_priv *priv, u32 off, int chan)
{
return bcm_readl(bcm_enet_shared_base[1] +
bcm63xx_enetdmacreg(off) + chan * priv->dma_chan_width);
}
static inline void enet_dmac_writel(struct bcm_enet_priv *priv,
u32 val, u32 off, int chan)
{
bcm_writel(val, bcm_enet_shared_base[1] +
bcm63xx_enetdmacreg(off) + chan * priv->dma_chan_width);
}
static inline u32 enet_dmas_readl(struct bcm_enet_priv *priv, u32 off, int chan)
{
return bcm_readl(bcm_enet_shared_base[2] + off + chan * priv->dma_chan_width);
}
static inline void enet_dmas_writel(struct bcm_enet_priv *priv,
u32 val, u32 off, int chan)
{
bcm_writel(val, bcm_enet_shared_base[2] + off + chan * priv->dma_chan_width);
}
/*
* write given data into mii register and wait for transfer to end
* with timeout (average measured transfer time is 25us)
*/
static int do_mdio_op(struct bcm_enet_priv *priv, unsigned int data)
{
int limit;
/* make sure mii interrupt status is cleared */
enet_writel(priv, ENET_IR_MII, ENET_IR_REG);
enet_writel(priv, data, ENET_MIIDATA_REG);
wmb();
/* busy wait on mii interrupt bit, with timeout */
limit = 1000;
do {
if (enet_readl(priv, ENET_IR_REG) & ENET_IR_MII)
break;
udelay(1);
} while (limit-- > 0);
return (limit < 0) ? 1 : 0;
}
/*
* MII internal read callback
*/
static int bcm_enet_mdio_read(struct bcm_enet_priv *priv, int mii_id,
int regnum)
{
u32 tmp, val;
tmp = regnum << ENET_MIIDATA_REG_SHIFT;
tmp |= 0x2 << ENET_MIIDATA_TA_SHIFT;
tmp |= mii_id << ENET_MIIDATA_PHYID_SHIFT;
tmp |= ENET_MIIDATA_OP_READ_MASK;
if (do_mdio_op(priv, tmp))
return -1;
val = enet_readl(priv, ENET_MIIDATA_REG);
val &= 0xffff;
return val;
}
/*
* MII internal write callback
*/
static int bcm_enet_mdio_write(struct bcm_enet_priv *priv, int mii_id,
int regnum, u16 value)
{
u32 tmp;
tmp = (value & 0xffff) << ENET_MIIDATA_DATA_SHIFT;
tmp |= 0x2 << ENET_MIIDATA_TA_SHIFT;
tmp |= regnum << ENET_MIIDATA_REG_SHIFT;
tmp |= mii_id << ENET_MIIDATA_PHYID_SHIFT;
tmp |= ENET_MIIDATA_OP_WRITE_MASK;
(void)do_mdio_op(priv, tmp);
return 0;
}
/*
* MII read callback from phylib
*/
static int bcm_enet_mdio_read_phylib(struct mii_bus *bus, int mii_id,
int regnum)
{
return bcm_enet_mdio_read(bus->priv, mii_id, regnum);
}
/*
* MII write callback from phylib
*/
static int bcm_enet_mdio_write_phylib(struct mii_bus *bus, int mii_id,
int regnum, u16 value)
{
return bcm_enet_mdio_write(bus->priv, mii_id, regnum, value);
}
/*
* MII read callback from mii core
*/
static int bcm_enet_mdio_read_mii(struct net_device *dev, int mii_id,
int regnum)
{
return bcm_enet_mdio_read(netdev_priv(dev), mii_id, regnum);
}
/*
* MII write callback from mii core
*/
static void bcm_enet_mdio_write_mii(struct net_device *dev, int mii_id,
int regnum, int value)
{
bcm_enet_mdio_write(netdev_priv(dev), mii_id, regnum, value);
}
/*
* refill rx queue
*/
static int bcm_enet_refill_rx(struct net_device *dev, bool napi_mode)
{
struct bcm_enet_priv *priv;
priv = netdev_priv(dev);
while (priv->rx_desc_count < priv->rx_ring_size) {
struct bcm_enet_desc *desc;
int desc_idx;
u32 len_stat;
desc_idx = priv->rx_dirty_desc;
desc = &priv->rx_desc_cpu[desc_idx];
if (!priv->rx_buf[desc_idx]) {
void *buf;
if (likely(napi_mode))
buf = napi_alloc_frag(priv->rx_frag_size);
else
buf = netdev_alloc_frag(priv->rx_frag_size);
if (unlikely(!buf))
break;
priv->rx_buf[desc_idx] = buf;
desc->address = dma_map_single(&priv->pdev->dev,
buf + priv->rx_buf_offset,
priv->rx_buf_size,
DMA_FROM_DEVICE);
}
len_stat = priv->rx_buf_size << DMADESC_LENGTH_SHIFT;
len_stat |= DMADESC_OWNER_MASK;
if (priv->rx_dirty_desc == priv->rx_ring_size - 1) {
len_stat |= (DMADESC_WRAP_MASK >> priv->dma_desc_shift);
priv->rx_dirty_desc = 0;
} else {
priv->rx_dirty_desc++;
}
wmb();
desc->len_stat = len_stat;
priv->rx_desc_count++;
/* tell dma engine we allocated one buffer */
if (priv->dma_has_sram)
enet_dma_writel(priv, 1, ENETDMA_BUFALLOC_REG(priv->rx_chan));
else
enet_dmac_writel(priv, 1, ENETDMAC_BUFALLOC, priv->rx_chan);
}
/* If rx ring is still empty, set a timer to try allocating
* again at a later time. */
if (priv->rx_desc_count == 0 && netif_running(dev)) {
dev_warn(&priv->pdev->dev, "unable to refill rx ring\n");
priv->rx_timeout.expires = jiffies + HZ;
add_timer(&priv->rx_timeout);
}
return 0;
}
/*
* timer callback to defer refill rx queue in case we're OOM
*/
static void bcm_enet_refill_rx_timer(struct timer_list *t)
{
struct bcm_enet_priv *priv = from_timer(priv, t, rx_timeout);
struct net_device *dev = priv->net_dev;
spin_lock(&priv->rx_lock);
bcm_enet_refill_rx(dev, false);
spin_unlock(&priv->rx_lock);
}
/*
* extract packet from rx queue
*/
static int bcm_enet_receive_queue(struct net_device *dev, int budget)
{
struct bcm_enet_priv *priv;
struct list_head rx_list;
struct device *kdev;
int processed;
priv = netdev_priv(dev);
INIT_LIST_HEAD(&rx_list);
kdev = &priv->pdev->dev;
processed = 0;
/* don't scan ring further than number of refilled
* descriptor */
if (budget > priv->rx_desc_count)
budget = priv->rx_desc_count;
do {
struct bcm_enet_desc *desc;
struct sk_buff *skb;
int desc_idx;
u32 len_stat;
unsigned int len;
void *buf;
desc_idx = priv->rx_curr_desc;
desc = &priv->rx_desc_cpu[desc_idx];
/* make sure we actually read the descriptor status at
* each loop */
rmb();
len_stat = desc->len_stat;
/* break if dma ownership belongs to hw */
if (len_stat & DMADESC_OWNER_MASK)
break;
processed++;
priv->rx_curr_desc++;
if (priv->rx_curr_desc == priv->rx_ring_size)
priv->rx_curr_desc = 0;
/* if the packet does not have start of packet _and_
* end of packet flag set, then just recycle it */
if ((len_stat & (DMADESC_ESOP_MASK >> priv->dma_desc_shift)) !=
(DMADESC_ESOP_MASK >> priv->dma_desc_shift)) {
dev->stats.rx_dropped++;
continue;
}
/* recycle packet if it's marked as bad */
if (!priv->enet_is_sw &&
unlikely(len_stat & DMADESC_ERR_MASK)) {
dev->stats.rx_errors++;
if (len_stat & DMADESC_OVSIZE_MASK)
dev->stats.rx_length_errors++;
if (len_stat & DMADESC_CRC_MASK)
dev->stats.rx_crc_errors++;
if (len_stat & DMADESC_UNDER_MASK)
dev->stats.rx_frame_errors++;
if (len_stat & DMADESC_OV_MASK)
dev->stats.rx_fifo_errors++;
continue;
}
/* valid packet */
buf = priv->rx_buf[desc_idx];
len = (len_stat & DMADESC_LENGTH_MASK) >> DMADESC_LENGTH_SHIFT;
/* don't include FCS */
len -= 4;
if (len < copybreak) {
skb = napi_alloc_skb(&priv->napi, len);
if (unlikely(!skb)) {
/* forget packet, just rearm desc */
dev->stats.rx_dropped++;
continue;
}
dma_sync_single_for_cpu(kdev, desc->address,
len, DMA_FROM_DEVICE);
memcpy(skb->data, buf + priv->rx_buf_offset, len);
dma_sync_single_for_device(kdev, desc->address,
len, DMA_FROM_DEVICE);
} else {
dma_unmap_single(kdev, desc->address,
priv->rx_buf_size, DMA_FROM_DEVICE);
priv->rx_buf[desc_idx] = NULL;
skb = napi_build_skb(buf, priv->rx_frag_size);
if (unlikely(!skb)) {
skb_free_frag(buf);
dev->stats.rx_dropped++;
continue;
}
skb_reserve(skb, priv->rx_buf_offset);
}
skb_put(skb, len);
skb->protocol = eth_type_trans(skb, dev);
dev->stats.rx_packets++;
dev->stats.rx_bytes += len;
list_add_tail(&skb->list, &rx_list);
} while (processed < budget);
netif_receive_skb_list(&rx_list);
priv->rx_desc_count -= processed;
if (processed || !priv->rx_desc_count) {
bcm_enet_refill_rx(dev, true);
/* kick rx dma */
enet_dmac_writel(priv, priv->dma_chan_en_mask,
ENETDMAC_CHANCFG, priv->rx_chan);
}
return processed;
}
/*
* try to or force reclaim of transmitted buffers
*/
static int bcm_enet_tx_reclaim(struct net_device *dev, int force, int budget)
{
struct bcm_enet_priv *priv;
unsigned int bytes;
int released;
priv = netdev_priv(dev);
bytes = 0;
released = 0;
while (priv->tx_desc_count < priv->tx_ring_size) {
struct bcm_enet_desc *desc;
struct sk_buff *skb;
/* We run in a bh and fight against start_xmit, which
* is called with bh disabled */
spin_lock(&priv->tx_lock);
desc = &priv->tx_desc_cpu[priv->tx_dirty_desc];
if (!force && (desc->len_stat & DMADESC_OWNER_MASK)) {
spin_unlock(&priv->tx_lock);
break;
}
/* ensure other field of the descriptor were not read
* before we checked ownership */
rmb();
skb = priv->tx_skb[priv->tx_dirty_desc];
priv->tx_skb[priv->tx_dirty_desc] = NULL;
dma_unmap_single(&priv->pdev->dev, desc->address, skb->len,
DMA_TO_DEVICE);
priv->tx_dirty_desc++;
if (priv->tx_dirty_desc == priv->tx_ring_size)
priv->tx_dirty_desc = 0;
priv->tx_desc_count++;
spin_unlock(&priv->tx_lock);
if (desc->len_stat & DMADESC_UNDER_MASK)
dev->stats.tx_errors++;
bytes += skb->len;
napi_consume_skb(skb, budget);
released++;
}
netdev_completed_queue(dev, released, bytes);
if (netif_queue_stopped(dev) && released)
netif_wake_queue(dev);
return released;
}
/*
* poll func, called by network core
*/
static int bcm_enet_poll(struct napi_struct *napi, int budget)
{
struct bcm_enet_priv *priv;
struct net_device *dev;
int rx_work_done;
priv = container_of(napi, struct bcm_enet_priv, napi);
dev = priv->net_dev;
/* ack interrupts */
enet_dmac_writel(priv, priv->dma_chan_int_mask,
ENETDMAC_IR, priv->rx_chan);
enet_dmac_writel(priv, priv->dma_chan_int_mask,
ENETDMAC_IR, priv->tx_chan);
/* reclaim sent skb */
bcm_enet_tx_reclaim(dev, 0, budget);
spin_lock(&priv->rx_lock);
rx_work_done = bcm_enet_receive_queue(dev, budget);
spin_unlock(&priv->rx_lock);
if (rx_work_done >= budget) {
/* rx queue is not yet empty/clean */
return rx_work_done;
}
/* no more packet in rx/tx queue, remove device from poll
* queue */
napi_complete_done(napi, rx_work_done);
/* restore rx/tx interrupt */
enet_dmac_writel(priv, priv->dma_chan_int_mask,
ENETDMAC_IRMASK, priv->rx_chan);
enet_dmac_writel(priv, priv->dma_chan_int_mask,
ENETDMAC_IRMASK, priv->tx_chan);
return rx_work_done;
}
/*
* mac interrupt handler
*/
static irqreturn_t bcm_enet_isr_mac(int irq, void *dev_id)
{
struct net_device *dev;
struct bcm_enet_priv *priv;
u32 stat;
dev = dev_id;
priv = netdev_priv(dev);
stat = enet_readl(priv, ENET_IR_REG);
if (!(stat & ENET_IR_MIB))
return IRQ_NONE;
/* clear & mask interrupt */
enet_writel(priv, ENET_IR_MIB, ENET_IR_REG);
enet_writel(priv, 0, ENET_IRMASK_REG);
/* read mib registers in workqueue */
schedule_work(&priv->mib_update_task);
return IRQ_HANDLED;
}
/*
* rx/tx dma interrupt handler
*/
static irqreturn_t bcm_enet_isr_dma(int irq, void *dev_id)
{
struct net_device *dev;
struct bcm_enet_priv *priv;
dev = dev_id;
priv = netdev_priv(dev);
/* mask rx/tx interrupts */
enet_dmac_writel(priv, 0, ENETDMAC_IRMASK, priv->rx_chan);
enet_dmac_writel(priv, 0, ENETDMAC_IRMASK, priv->tx_chan);
napi_schedule(&priv->napi);
return IRQ_HANDLED;
}
/*
* tx request callback
*/
static netdev_tx_t
bcm_enet_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct bcm_enet_priv *priv;
struct bcm_enet_desc *desc;
u32 len_stat;
netdev_tx_t ret;
priv = netdev_priv(dev);
/* lock against tx reclaim */
spin_lock(&priv->tx_lock);
/* make sure the tx hw queue is not full, should not happen
* since we stop queue before it's the case */
if (unlikely(!priv->tx_desc_count)) {
netif_stop_queue(dev);
dev_err(&priv->pdev->dev, "xmit called with no tx desc "
"available?\n");
ret = NETDEV_TX_BUSY;
goto out_unlock;
}
/* pad small packets sent on a switch device */
if (priv->enet_is_sw && skb->len < 64) {
int needed = 64 - skb->len;
char *data;
if (unlikely(skb_tailroom(skb) < needed)) {
struct sk_buff *nskb;
nskb = skb_copy_expand(skb, 0, needed, GFP_ATOMIC);
if (!nskb) {
ret = NETDEV_TX_BUSY;
goto out_unlock;
}
dev_kfree_skb(skb);
skb = nskb;
}
data = skb_put_zero(skb, needed);
}
/* point to the next available desc */
desc = &priv->tx_desc_cpu[priv->tx_curr_desc];
priv->tx_skb[priv->tx_curr_desc] = skb;
/* fill descriptor */
desc->address = dma_map_single(&priv->pdev->dev, skb->data, skb->len,
DMA_TO_DEVICE);
len_stat = (skb->len << DMADESC_LENGTH_SHIFT) & DMADESC_LENGTH_MASK;
len_stat |= (DMADESC_ESOP_MASK >> priv->dma_desc_shift) |
DMADESC_APPEND_CRC |
DMADESC_OWNER_MASK;
priv->tx_curr_desc++;
if (priv->tx_curr_desc == priv->tx_ring_size) {
priv->tx_curr_desc = 0;
len_stat |= (DMADESC_WRAP_MASK >> priv->dma_desc_shift);
}
priv->tx_desc_count--;
/* dma might be already polling, make sure we update desc
* fields in correct order */
wmb();
desc->len_stat = len_stat;
wmb();
netdev_sent_queue(dev, skb->len);
/* kick tx dma */
if (!netdev_xmit_more() || !priv->tx_desc_count)
enet_dmac_writel(priv, priv->dma_chan_en_mask,
ENETDMAC_CHANCFG, priv->tx_chan);
/* stop queue if no more desc available */
if (!priv->tx_desc_count)
netif_stop_queue(dev);
dev->stats.tx_bytes += skb->len;
dev->stats.tx_packets++;
ret = NETDEV_TX_OK;
out_unlock:
spin_unlock(&priv->tx_lock);
return ret;
}
/*
* Change the interface's mac address.
*/
static int bcm_enet_set_mac_address(struct net_device *dev, void *p)
{
struct bcm_enet_priv *priv;
struct sockaddr *addr = p;
u32 val;
priv = netdev_priv(dev);
eth_hw_addr_set(dev, addr->sa_data);
/* use perfect match register 0 to store my mac address */
val = (dev->dev_addr[2] << 24) | (dev->dev_addr[3] << 16) |
(dev->dev_addr[4] << 8) | dev->dev_addr[5];
enet_writel(priv, val, ENET_PML_REG(0));
val = (dev->dev_addr[0] << 8 | dev->dev_addr[1]);
val |= ENET_PMH_DATAVALID_MASK;
enet_writel(priv, val, ENET_PMH_REG(0));
return 0;
}
/*
* Change rx mode (promiscuous/allmulti) and update multicast list
*/
static void bcm_enet_set_multicast_list(struct net_device *dev)
{
struct bcm_enet_priv *priv;
struct netdev_hw_addr *ha;
u32 val;
int i;
priv = netdev_priv(dev);
val = enet_readl(priv, ENET_RXCFG_REG);
if (dev->flags & IFF_PROMISC)
val |= ENET_RXCFG_PROMISC_MASK;
else
val &= ~ENET_RXCFG_PROMISC_MASK;
/* only 3 perfect match registers left, first one is used for
* own mac address */
if ((dev->flags & IFF_ALLMULTI) || netdev_mc_count(dev) > 3)
val |= ENET_RXCFG_ALLMCAST_MASK;
else
val &= ~ENET_RXCFG_ALLMCAST_MASK;
/* no need to set perfect match registers if we catch all
* multicast */
if (val & ENET_RXCFG_ALLMCAST_MASK) {
enet_writel(priv, val, ENET_RXCFG_REG);
return;
}
i = 0;
netdev_for_each_mc_addr(ha, dev) {
u8 *dmi_addr;
u32 tmp;
if (i == 3)
break;
/* update perfect match registers */
dmi_addr = ha->addr;
tmp = (dmi_addr[2] << 24) | (dmi_addr[3] << 16) |
(dmi_addr[4] << 8) | dmi_addr[5];
enet_writel(priv, tmp, ENET_PML_REG(i + 1));
tmp = (dmi_addr[0] << 8 | dmi_addr[1]);
tmp |= ENET_PMH_DATAVALID_MASK;
enet_writel(priv, tmp, ENET_PMH_REG(i++ + 1));
}
for (; i < 3; i++) {
enet_writel(priv, 0, ENET_PML_REG(i + 1));
enet_writel(priv, 0, ENET_PMH_REG(i + 1));
}
enet_writel(priv, val, ENET_RXCFG_REG);
}
/*
* set mac duplex parameters
*/
static void bcm_enet_set_duplex(struct bcm_enet_priv *priv, int fullduplex)
{
u32 val;
val = enet_readl(priv, ENET_TXCTL_REG);
if (fullduplex)
val |= ENET_TXCTL_FD_MASK;
else
val &= ~ENET_TXCTL_FD_MASK;
enet_writel(priv, val, ENET_TXCTL_REG);
}
/*
* set mac flow control parameters
*/
static void bcm_enet_set_flow(struct bcm_enet_priv *priv, int rx_en, int tx_en)
{
u32 val;
/* rx flow control (pause frame handling) */
val = enet_readl(priv, ENET_RXCFG_REG);
if (rx_en)
val |= ENET_RXCFG_ENFLOW_MASK;
else
val &= ~ENET_RXCFG_ENFLOW_MASK;
enet_writel(priv, val, ENET_RXCFG_REG);
if (!priv->dma_has_sram)
return;
/* tx flow control (pause frame generation) */
val = enet_dma_readl(priv, ENETDMA_CFG_REG);
if (tx_en)
val |= ENETDMA_CFG_FLOWCH_MASK(priv->rx_chan);
else
val &= ~ENETDMA_CFG_FLOWCH_MASK(priv->rx_chan);
enet_dma_writel(priv, val, ENETDMA_CFG_REG);
}
/*
* link changed callback (from phylib)
*/
static void bcm_enet_adjust_phy_link(struct net_device *dev)
{
struct bcm_enet_priv *priv;
struct phy_device *phydev;
int status_changed;
priv = netdev_priv(dev);
phydev = dev->phydev;
status_changed = 0;
if (priv->old_link != phydev->link) {
status_changed = 1;
priv->old_link = phydev->link;
}
/* reflect duplex change in mac configuration */
if (phydev->link && phydev->duplex != priv->old_duplex) {
bcm_enet_set_duplex(priv,
(phydev->duplex == DUPLEX_FULL) ? 1 : 0);
status_changed = 1;
priv->old_duplex = phydev->duplex;
}
/* enable flow control if remote advertise it (trust phylib to
* check that duplex is full */
if (phydev->link && phydev->pause != priv->old_pause) {
int rx_pause_en, tx_pause_en;
if (phydev->pause) {
/* pause was advertised by lpa and us */
rx_pause_en = 1;
tx_pause_en = 1;
} else if (!priv->pause_auto) {
/* pause setting overridden by user */
rx_pause_en = priv->pause_rx;
tx_pause_en = priv->pause_tx;
} else {
rx_pause_en = 0;
tx_pause_en = 0;
}
bcm_enet_set_flow(priv, rx_pause_en, tx_pause_en);
status_changed = 1;
priv->old_pause = phydev->pause;
}
if (status_changed) {
pr_info("%s: link %s", dev->name, phydev->link ?
"UP" : "DOWN");
if (phydev->link)
pr_cont(" - %d/%s - flow control %s", phydev->speed,
DUPLEX_FULL == phydev->duplex ? "full" : "half",
phydev->pause == 1 ? "rx&tx" : "off");
pr_cont("\n");
}
}
/*
* link changed callback (if phylib is not used)
*/
static void bcm_enet_adjust_link(struct net_device *dev)
{
struct bcm_enet_priv *priv;
priv = netdev_priv(dev);
bcm_enet_set_duplex(priv, priv->force_duplex_full);
bcm_enet_set_flow(priv, priv->pause_rx, priv->pause_tx);
netif_carrier_on(dev);
pr_info("%s: link forced UP - %d/%s - flow control %s/%s\n",
dev->name,
priv->force_speed_100 ? 100 : 10,
priv->force_duplex_full ? "full" : "half",
priv->pause_rx ? "rx" : "off",
priv->pause_tx ? "tx" : "off");
}
static void bcm_enet_free_rx_buf_ring(struct device *kdev, struct bcm_enet_priv *priv)
{
int i;
for (i = 0; i < priv->rx_ring_size; i++) {
struct bcm_enet_desc *desc;
if (!priv->rx_buf[i])
continue;
desc = &priv->rx_desc_cpu[i];
dma_unmap_single(kdev, desc->address, priv->rx_buf_size,
DMA_FROM_DEVICE);
skb_free_frag(priv->rx_buf[i]);
}
kfree(priv->rx_buf);
}
/*
* open callback, allocate dma rings & buffers and start rx operation
*/
static int bcm_enet_open(struct net_device *dev)
{
struct bcm_enet_priv *priv;
struct sockaddr addr;
struct device *kdev;
struct phy_device *phydev;
int i, ret;
unsigned int size;
char phy_id[MII_BUS_ID_SIZE + 3];
void *p;
u32 val;
priv = netdev_priv(dev);
kdev = &priv->pdev->dev;
if (priv->has_phy) {
/* connect to PHY */
snprintf(phy_id, sizeof(phy_id), PHY_ID_FMT,
priv->mii_bus->id, priv->phy_id);
phydev = phy_connect(dev, phy_id, bcm_enet_adjust_phy_link,
PHY_INTERFACE_MODE_MII);
if (IS_ERR(phydev)) {
dev_err(kdev, "could not attach to PHY\n");
return PTR_ERR(phydev);
}
/* mask with MAC supported features */
phy_support_sym_pause(phydev);
phy_set_max_speed(phydev, SPEED_100);
phy_set_sym_pause(phydev, priv->pause_rx, priv->pause_rx,
priv->pause_auto);
phy_attached_info(phydev);
priv->old_link = 0;
priv->old_duplex = -1;
priv->old_pause = -1;
} else {
phydev = NULL;
}
/* mask all interrupts and request them */
enet_writel(priv, 0, ENET_IRMASK_REG);
enet_dmac_writel(priv, 0, ENETDMAC_IRMASK, priv->rx_chan);
enet_dmac_writel(priv, 0, ENETDMAC_IRMASK, priv->tx_chan);
ret = request_irq(dev->irq, bcm_enet_isr_mac, 0, dev->name, dev);
if (ret)
goto out_phy_disconnect;
ret = request_irq(priv->irq_rx, bcm_enet_isr_dma, 0,
dev->name, dev);
if (ret)
goto out_freeirq;
ret = request_irq(priv->irq_tx, bcm_enet_isr_dma,
0, dev->name, dev);
if (ret)
goto out_freeirq_rx;
/* initialize perfect match registers */
for (i = 0; i < 4; i++) {
enet_writel(priv, 0, ENET_PML_REG(i));
enet_writel(priv, 0, ENET_PMH_REG(i));
}
/* write device mac address */
memcpy(addr.sa_data, dev->dev_addr, ETH_ALEN);
bcm_enet_set_mac_address(dev, &addr);
/* allocate rx dma ring */
size = priv->rx_ring_size * sizeof(struct bcm_enet_desc);
p = dma_alloc_coherent(kdev, size, &priv->rx_desc_dma, GFP_KERNEL);
if (!p) {
ret = -ENOMEM;
goto out_freeirq_tx;
}
priv->rx_desc_alloc_size = size;
priv->rx_desc_cpu = p;
/* allocate tx dma ring */
size = priv->tx_ring_size * sizeof(struct bcm_enet_desc);
p = dma_alloc_coherent(kdev, size, &priv->tx_desc_dma, GFP_KERNEL);
if (!p) {
ret = -ENOMEM;
goto out_free_rx_ring;
}
priv->tx_desc_alloc_size = size;
priv->tx_desc_cpu = p;
priv->tx_skb = kcalloc(priv->tx_ring_size, sizeof(struct sk_buff *),
GFP_KERNEL);
if (!priv->tx_skb) {
ret = -ENOMEM;
goto out_free_tx_ring;
}
priv->tx_desc_count = priv->tx_ring_size;
priv->tx_dirty_desc = 0;
priv->tx_curr_desc = 0;
spin_lock_init(&priv->tx_lock);
/* init & fill rx ring with buffers */
priv->rx_buf = kcalloc(priv->rx_ring_size, sizeof(void *),
GFP_KERNEL);
if (!priv->rx_buf) {
ret = -ENOMEM;
goto out_free_tx_skb;
}
priv->rx_desc_count = 0;
priv->rx_dirty_desc = 0;
priv->rx_curr_desc = 0;
/* initialize flow control buffer allocation */
if (priv->dma_has_sram)
enet_dma_writel(priv, ENETDMA_BUFALLOC_FORCE_MASK | 0,
ENETDMA_BUFALLOC_REG(priv->rx_chan));
else
enet_dmac_writel(priv, ENETDMA_BUFALLOC_FORCE_MASK | 0,
ENETDMAC_BUFALLOC, priv->rx_chan);
if (bcm_enet_refill_rx(dev, false)) {
dev_err(kdev, "cannot allocate rx buffer queue\n");
ret = -ENOMEM;
goto out;
}
/* write rx & tx ring addresses */
if (priv->dma_has_sram) {
enet_dmas_writel(priv, priv->rx_desc_dma,
ENETDMAS_RSTART_REG, priv->rx_chan);
enet_dmas_writel(priv, priv->tx_desc_dma,
ENETDMAS_RSTART_REG, priv->tx_chan);
} else {
enet_dmac_writel(priv, priv->rx_desc_dma,
ENETDMAC_RSTART, priv->rx_chan);
enet_dmac_writel(priv, priv->tx_desc_dma,
ENETDMAC_RSTART, priv->tx_chan);
}
/* clear remaining state ram for rx & tx channel */
if (priv->dma_has_sram) {
enet_dmas_writel(priv, 0, ENETDMAS_SRAM2_REG, priv->rx_chan);
enet_dmas_writel(priv, 0, ENETDMAS_SRAM2_REG, priv->tx_chan);
enet_dmas_writel(priv, 0, ENETDMAS_SRAM3_REG, priv->rx_chan);
enet_dmas_writel(priv, 0, ENETDMAS_SRAM3_REG, priv->tx_chan);
enet_dmas_writel(priv, 0, ENETDMAS_SRAM4_REG, priv->rx_chan);
enet_dmas_writel(priv, 0, ENETDMAS_SRAM4_REG, priv->tx_chan);
} else {
enet_dmac_writel(priv, 0, ENETDMAC_FC, priv->rx_chan);
enet_dmac_writel(priv, 0, ENETDMAC_FC, priv->tx_chan);
}
/* set max rx/tx length */
enet_writel(priv, priv->hw_mtu, ENET_RXMAXLEN_REG);
enet_writel(priv, priv->hw_mtu, ENET_TXMAXLEN_REG);
/* set dma maximum burst len */
enet_dmac_writel(priv, priv->dma_maxburst,
ENETDMAC_MAXBURST, priv->rx_chan);
enet_dmac_writel(priv, priv->dma_maxburst,
ENETDMAC_MAXBURST, priv->tx_chan);
/* set correct transmit fifo watermark */
enet_writel(priv, BCMENET_TX_FIFO_TRESH, ENET_TXWMARK_REG);
/* set flow control low/high threshold to 1/3 / 2/3 */
if (priv->dma_has_sram) {
val = priv->rx_ring_size / 3;
enet_dma_writel(priv, val, ENETDMA_FLOWCL_REG(priv->rx_chan));
val = (priv->rx_ring_size * 2) / 3;
enet_dma_writel(priv, val, ENETDMA_FLOWCH_REG(priv->rx_chan));
} else {
enet_dmac_writel(priv, 5, ENETDMAC_FC, priv->rx_chan);
enet_dmac_writel(priv, priv->rx_ring_size, ENETDMAC_LEN, priv->rx_chan);
enet_dmac_writel(priv, priv->tx_ring_size, ENETDMAC_LEN, priv->tx_chan);
}
/* all set, enable mac and interrupts, start dma engine and
* kick rx dma channel */
wmb();
val = enet_readl(priv, ENET_CTL_REG);
val |= ENET_CTL_ENABLE_MASK;
enet_writel(priv, val, ENET_CTL_REG);
if (priv->dma_has_sram)
enet_dma_writel(priv, ENETDMA_CFG_EN_MASK, ENETDMA_CFG_REG);
enet_dmac_writel(priv, priv->dma_chan_en_mask,
ENETDMAC_CHANCFG, priv->rx_chan);
/* watch "mib counters about to overflow" interrupt */
enet_writel(priv, ENET_IR_MIB, ENET_IR_REG);
enet_writel(priv, ENET_IR_MIB, ENET_IRMASK_REG);
/* watch "packet transferred" interrupt in rx and tx */
enet_dmac_writel(priv, priv->dma_chan_int_mask,
ENETDMAC_IR, priv->rx_chan);
enet_dmac_writel(priv, priv->dma_chan_int_mask,
ENETDMAC_IR, priv->tx_chan);
/* make sure we enable napi before rx interrupt */
napi_enable(&priv->napi);
enet_dmac_writel(priv, priv->dma_chan_int_mask,
ENETDMAC_IRMASK, priv->rx_chan);
enet_dmac_writel(priv, priv->dma_chan_int_mask,
ENETDMAC_IRMASK, priv->tx_chan);
if (phydev)
phy_start(phydev);
else
bcm_enet_adjust_link(dev);
netif_start_queue(dev);
return 0;
out:
bcm_enet_free_rx_buf_ring(kdev, priv);
out_free_tx_skb:
kfree(priv->tx_skb);
out_free_tx_ring:
dma_free_coherent(kdev, priv->tx_desc_alloc_size,
priv->tx_desc_cpu, priv->tx_desc_dma);
out_free_rx_ring:
dma_free_coherent(kdev, priv->rx_desc_alloc_size,
priv->rx_desc_cpu, priv->rx_desc_dma);
out_freeirq_tx:
free_irq(priv->irq_tx, dev);
out_freeirq_rx:
free_irq(priv->irq_rx, dev);
out_freeirq:
free_irq(dev->irq, dev);
out_phy_disconnect:
if (phydev)
phy_disconnect(phydev);
return ret;
}
/*
* disable mac
*/
static void bcm_enet_disable_mac(struct bcm_enet_priv *priv)
{
int limit;
u32 val;
val = enet_readl(priv, ENET_CTL_REG);
val |= ENET_CTL_DISABLE_MASK;
enet_writel(priv, val, ENET_CTL_REG);
limit = 1000;
do {
u32 val;
val = enet_readl(priv, ENET_CTL_REG);
if (!(val & ENET_CTL_DISABLE_MASK))
break;
udelay(1);
} while (limit--);
}
/*
* disable dma in given channel
*/
static void bcm_enet_disable_dma(struct bcm_enet_priv *priv, int chan)
{
int limit;
enet_dmac_writel(priv, 0, ENETDMAC_CHANCFG, chan);
limit = 1000;
do {
u32 val;
val = enet_dmac_readl(priv, ENETDMAC_CHANCFG, chan);
if (!(val & ENETDMAC_CHANCFG_EN_MASK))
break;
udelay(1);
} while (limit--);
}
/*
* stop callback
*/
static int bcm_enet_stop(struct net_device *dev)
{
struct bcm_enet_priv *priv;
struct device *kdev;
priv = netdev_priv(dev);
kdev = &priv->pdev->dev;
netif_stop_queue(dev);
napi_disable(&priv->napi);
if (priv->has_phy)
phy_stop(dev->phydev);
del_timer_sync(&priv->rx_timeout);
/* mask all interrupts */
enet_writel(priv, 0, ENET_IRMASK_REG);
enet_dmac_writel(priv, 0, ENETDMAC_IRMASK, priv->rx_chan);
enet_dmac_writel(priv, 0, ENETDMAC_IRMASK, priv->tx_chan);
/* make sure no mib update is scheduled */
cancel_work_sync(&priv->mib_update_task);
/* disable dma & mac */
bcm_enet_disable_dma(priv, priv->tx_chan);
bcm_enet_disable_dma(priv, priv->rx_chan);
bcm_enet_disable_mac(priv);
/* force reclaim of all tx buffers */
bcm_enet_tx_reclaim(dev, 1, 0);
/* free the rx buffer ring */
bcm_enet_free_rx_buf_ring(kdev, priv);
/* free remaining allocated memory */
kfree(priv->tx_skb);
dma_free_coherent(kdev, priv->rx_desc_alloc_size,
priv->rx_desc_cpu, priv->rx_desc_dma);
dma_free_coherent(kdev, priv->tx_desc_alloc_size,
priv->tx_desc_cpu, priv->tx_desc_dma);
free_irq(priv->irq_tx, dev);
free_irq(priv->irq_rx, dev);
free_irq(dev->irq, dev);
/* release phy */
if (priv->has_phy)
phy_disconnect(dev->phydev);
/* reset BQL after forced tx reclaim to prevent kernel panic */
netdev_reset_queue(dev);
return 0;
}
/*
* ethtool callbacks
*/
struct bcm_enet_stats {
char stat_string[ETH_GSTRING_LEN];
int sizeof_stat;
int stat_offset;
int mib_reg;
};
#define GEN_STAT(m) sizeof(((struct bcm_enet_priv *)0)->m), \
offsetof(struct bcm_enet_priv, m)
#define DEV_STAT(m) sizeof(((struct net_device_stats *)0)->m), \
offsetof(struct net_device_stats, m)
static const struct bcm_enet_stats bcm_enet_gstrings_stats[] = {
{ "rx_packets", DEV_STAT(rx_packets), -1 },
{ "tx_packets", DEV_STAT(tx_packets), -1 },
{ "rx_bytes", DEV_STAT(rx_bytes), -1 },
{ "tx_bytes", DEV_STAT(tx_bytes), -1 },
{ "rx_errors", DEV_STAT(rx_errors), -1 },
{ "tx_errors", DEV_STAT(tx_errors), -1 },
{ "rx_dropped", DEV_STAT(rx_dropped), -1 },
{ "tx_dropped", DEV_STAT(tx_dropped), -1 },
{ "rx_good_octets", GEN_STAT(mib.rx_gd_octets), ETH_MIB_RX_GD_OCTETS},
{ "rx_good_pkts", GEN_STAT(mib.rx_gd_pkts), ETH_MIB_RX_GD_PKTS },
{ "rx_broadcast", GEN_STAT(mib.rx_brdcast), ETH_MIB_RX_BRDCAST },
{ "rx_multicast", GEN_STAT(mib.rx_mult), ETH_MIB_RX_MULT },
{ "rx_64_octets", GEN_STAT(mib.rx_64), ETH_MIB_RX_64 },
{ "rx_65_127_oct", GEN_STAT(mib.rx_65_127), ETH_MIB_RX_65_127 },
{ "rx_128_255_oct", GEN_STAT(mib.rx_128_255), ETH_MIB_RX_128_255 },
{ "rx_256_511_oct", GEN_STAT(mib.rx_256_511), ETH_MIB_RX_256_511 },
{ "rx_512_1023_oct", GEN_STAT(mib.rx_512_1023), ETH_MIB_RX_512_1023 },
{ "rx_1024_max_oct", GEN_STAT(mib.rx_1024_max), ETH_MIB_RX_1024_MAX },
{ "rx_jabber", GEN_STAT(mib.rx_jab), ETH_MIB_RX_JAB },
{ "rx_oversize", GEN_STAT(mib.rx_ovr), ETH_MIB_RX_OVR },
{ "rx_fragment", GEN_STAT(mib.rx_frag), ETH_MIB_RX_FRAG },
{ "rx_dropped", GEN_STAT(mib.rx_drop), ETH_MIB_RX_DROP },
{ "rx_crc_align", GEN_STAT(mib.rx_crc_align), ETH_MIB_RX_CRC_ALIGN },
{ "rx_undersize", GEN_STAT(mib.rx_und), ETH_MIB_RX_UND },
{ "rx_crc", GEN_STAT(mib.rx_crc), ETH_MIB_RX_CRC },
{ "rx_align", GEN_STAT(mib.rx_align), ETH_MIB_RX_ALIGN },
{ "rx_symbol_error", GEN_STAT(mib.rx_sym), ETH_MIB_RX_SYM },
{ "rx_pause", GEN_STAT(mib.rx_pause), ETH_MIB_RX_PAUSE },
{ "rx_control", GEN_STAT(mib.rx_cntrl), ETH_MIB_RX_CNTRL },
{ "tx_good_octets", GEN_STAT(mib.tx_gd_octets), ETH_MIB_TX_GD_OCTETS },
{ "tx_good_pkts", GEN_STAT(mib.tx_gd_pkts), ETH_MIB_TX_GD_PKTS },
{ "tx_broadcast", GEN_STAT(mib.tx_brdcast), ETH_MIB_TX_BRDCAST },
{ "tx_multicast", GEN_STAT(mib.tx_mult), ETH_MIB_TX_MULT },
{ "tx_64_oct", GEN_STAT(mib.tx_64), ETH_MIB_TX_64 },
{ "tx_65_127_oct", GEN_STAT(mib.tx_65_127), ETH_MIB_TX_65_127 },
{ "tx_128_255_oct", GEN_STAT(mib.tx_128_255), ETH_MIB_TX_128_255 },
{ "tx_256_511_oct", GEN_STAT(mib.tx_256_511), ETH_MIB_TX_256_511 },
{ "tx_512_1023_oct", GEN_STAT(mib.tx_512_1023), ETH_MIB_TX_512_1023},
{ "tx_1024_max_oct", GEN_STAT(mib.tx_1024_max), ETH_MIB_TX_1024_MAX },
{ "tx_jabber", GEN_STAT(mib.tx_jab), ETH_MIB_TX_JAB },
{ "tx_oversize", GEN_STAT(mib.tx_ovr), ETH_MIB_TX_OVR },
{ "tx_fragment", GEN_STAT(mib.tx_frag), ETH_MIB_TX_FRAG },
{ "tx_underrun", GEN_STAT(mib.tx_underrun), ETH_MIB_TX_UNDERRUN },
{ "tx_collisions", GEN_STAT(mib.tx_col), ETH_MIB_TX_COL },
{ "tx_single_collision", GEN_STAT(mib.tx_1_col), ETH_MIB_TX_1_COL },
{ "tx_multiple_collision", GEN_STAT(mib.tx_m_col), ETH_MIB_TX_M_COL },
{ "tx_excess_collision", GEN_STAT(mib.tx_ex_col), ETH_MIB_TX_EX_COL },
{ "tx_late_collision", GEN_STAT(mib.tx_late), ETH_MIB_TX_LATE },
{ "tx_deferred", GEN_STAT(mib.tx_def), ETH_MIB_TX_DEF },
{ "tx_carrier_sense", GEN_STAT(mib.tx_crs), ETH_MIB_TX_CRS },
{ "tx_pause", GEN_STAT(mib.tx_pause), ETH_MIB_TX_PAUSE },
};
#define BCM_ENET_STATS_LEN ARRAY_SIZE(bcm_enet_gstrings_stats)
static const u32 unused_mib_regs[] = {
ETH_MIB_TX_ALL_OCTETS,
ETH_MIB_TX_ALL_PKTS,
ETH_MIB_RX_ALL_OCTETS,
ETH_MIB_RX_ALL_PKTS,
};
static void bcm_enet_get_drvinfo(struct net_device *netdev,
struct ethtool_drvinfo *drvinfo)
{
strscpy(drvinfo->driver, bcm_enet_driver_name, sizeof(drvinfo->driver));
strscpy(drvinfo->bus_info, "bcm63xx", sizeof(drvinfo->bus_info));
}
static int bcm_enet_get_sset_count(struct net_device *netdev,
int string_set)
{
switch (string_set) {
case ETH_SS_STATS:
return BCM_ENET_STATS_LEN;
default:
return -EINVAL;
}
}
static void bcm_enet_get_strings(struct net_device *netdev,
u32 stringset, u8 *data)
{
int i;
switch (stringset) {
case ETH_SS_STATS:
for (i = 0; i < BCM_ENET_STATS_LEN; i++) {
memcpy(data + i * ETH_GSTRING_LEN,
bcm_enet_gstrings_stats[i].stat_string,
ETH_GSTRING_LEN);
}
break;
}
}
static void update_mib_counters(struct bcm_enet_priv *priv)
{
int i;
for (i = 0; i < BCM_ENET_STATS_LEN; i++) {
const struct bcm_enet_stats *s;
u32 val;
char *p;
s = &bcm_enet_gstrings_stats[i];
if (s->mib_reg == -1)
continue;
val = enet_readl(priv, ENET_MIB_REG(s->mib_reg));
p = (char *)priv + s->stat_offset;
if (s->sizeof_stat == sizeof(u64))
*(u64 *)p += val;
else
*(u32 *)p += val;
}
/* also empty unused mib counters to make sure mib counter
* overflow interrupt is cleared */
for (i = 0; i < ARRAY_SIZE(unused_mib_regs); i++)
(void)enet_readl(priv, ENET_MIB_REG(unused_mib_regs[i]));
}
static void bcm_enet_update_mib_counters_defer(struct work_struct *t)
{
struct bcm_enet_priv *priv;
priv = container_of(t, struct bcm_enet_priv, mib_update_task);
mutex_lock(&priv->mib_update_lock);
update_mib_counters(priv);
mutex_unlock(&priv->mib_update_lock);
/* reenable mib interrupt */
if (netif_running(priv->net_dev))
enet_writel(priv, ENET_IR_MIB, ENET_IRMASK_REG);
}
static void bcm_enet_get_ethtool_stats(struct net_device *netdev,
struct ethtool_stats *stats,
u64 *data)
{
struct bcm_enet_priv *priv;
int i;
priv = netdev_priv(netdev);
mutex_lock(&priv->mib_update_lock);
update_mib_counters(priv);
for (i = 0; i < BCM_ENET_STATS_LEN; i++) {
const struct bcm_enet_stats *s;
char *p;
s = &bcm_enet_gstrings_stats[i];
if (s->mib_reg == -1)
p = (char *)&netdev->stats;
else
p = (char *)priv;
p += s->stat_offset;
data[i] = (s->sizeof_stat == sizeof(u64)) ?
*(u64 *)p : *(u32 *)p;
}
mutex_unlock(&priv->mib_update_lock);
}
static int bcm_enet_nway_reset(struct net_device *dev)
{
struct bcm_enet_priv *priv;
priv = netdev_priv(dev);
if (priv->has_phy)
return phy_ethtool_nway_reset(dev);
return -EOPNOTSUPP;
}
static int bcm_enet_get_link_ksettings(struct net_device *dev,
struct ethtool_link_ksettings *cmd)
{
struct bcm_enet_priv *priv;
u32 supported, advertising;
priv = netdev_priv(dev);
if (priv->has_phy) {
if (!dev->phydev)
return -ENODEV;
phy_ethtool_ksettings_get(dev->phydev, cmd);
return 0;
} else {
cmd->base.autoneg = 0;
cmd->base.speed = (priv->force_speed_100) ?
SPEED_100 : SPEED_10;
cmd->base.duplex = (priv->force_duplex_full) ?
DUPLEX_FULL : DUPLEX_HALF;
supported = ADVERTISED_10baseT_Half |
ADVERTISED_10baseT_Full |
ADVERTISED_100baseT_Half |
ADVERTISED_100baseT_Full;
advertising = 0;
ethtool_convert_legacy_u32_to_link_mode(
cmd->link_modes.supported, supported);
ethtool_convert_legacy_u32_to_link_mode(
cmd->link_modes.advertising, advertising);
cmd->base.port = PORT_MII;
}
return 0;
}
static int bcm_enet_set_link_ksettings(struct net_device *dev,
const struct ethtool_link_ksettings *cmd)
{
struct bcm_enet_priv *priv;
priv = netdev_priv(dev);
if (priv->has_phy) {
if (!dev->phydev)
return -ENODEV;
return phy_ethtool_ksettings_set(dev->phydev, cmd);
} else {
if (cmd->base.autoneg ||
(cmd->base.speed != SPEED_100 &&
cmd->base.speed != SPEED_10) ||
cmd->base.port != PORT_MII)
return -EINVAL;
priv->force_speed_100 =
(cmd->base.speed == SPEED_100) ? 1 : 0;
priv->force_duplex_full =
(cmd->base.duplex == DUPLEX_FULL) ? 1 : 0;
if (netif_running(dev))
bcm_enet_adjust_link(dev);
return 0;
}
}
static void
bcm_enet_get_ringparam(struct net_device *dev,
struct ethtool_ringparam *ering,
struct kernel_ethtool_ringparam *kernel_ering,
struct netlink_ext_ack *extack)
{
struct bcm_enet_priv *priv;
priv = netdev_priv(dev);
/* rx/tx ring is actually only limited by memory */
ering->rx_max_pending = 8192;
ering->tx_max_pending = 8192;
ering->rx_pending = priv->rx_ring_size;
ering->tx_pending = priv->tx_ring_size;
}
static int bcm_enet_set_ringparam(struct net_device *dev,
struct ethtool_ringparam *ering,
struct kernel_ethtool_ringparam *kernel_ering,
struct netlink_ext_ack *extack)
{
struct bcm_enet_priv *priv;
int was_running;
priv = netdev_priv(dev);
was_running = 0;
if (netif_running(dev)) {
bcm_enet_stop(dev);
was_running = 1;
}
priv->rx_ring_size = ering->rx_pending;
priv->tx_ring_size = ering->tx_pending;
if (was_running) {
int err;
err = bcm_enet_open(dev);
if (err)
dev_close(dev);
else
bcm_enet_set_multicast_list(dev);
}
return 0;
}
static void bcm_enet_get_pauseparam(struct net_device *dev,
struct ethtool_pauseparam *ecmd)
{
struct bcm_enet_priv *priv;
priv = netdev_priv(dev);
ecmd->autoneg = priv->pause_auto;
ecmd->rx_pause = priv->pause_rx;
ecmd->tx_pause = priv->pause_tx;
}
static int bcm_enet_set_pauseparam(struct net_device *dev,
struct ethtool_pauseparam *ecmd)
{
struct bcm_enet_priv *priv;
priv = netdev_priv(dev);
if (priv->has_phy) {
if (ecmd->autoneg && (ecmd->rx_pause != ecmd->tx_pause)) {
/* asymetric pause mode not supported,
* actually possible but integrated PHY has RO
* asym_pause bit */
return -EINVAL;
}
} else {
/* no pause autoneg on direct mii connection */
if (ecmd->autoneg)
return -EINVAL;
}
priv->pause_auto = ecmd->autoneg;
priv->pause_rx = ecmd->rx_pause;
priv->pause_tx = ecmd->tx_pause;
return 0;
}
static const struct ethtool_ops bcm_enet_ethtool_ops = {
.get_strings = bcm_enet_get_strings,
.get_sset_count = bcm_enet_get_sset_count,
.get_ethtool_stats = bcm_enet_get_ethtool_stats,
.nway_reset = bcm_enet_nway_reset,
.get_drvinfo = bcm_enet_get_drvinfo,
.get_link = ethtool_op_get_link,
.get_ringparam = bcm_enet_get_ringparam,
.set_ringparam = bcm_enet_set_ringparam,
.get_pauseparam = bcm_enet_get_pauseparam,
.set_pauseparam = bcm_enet_set_pauseparam,
.get_link_ksettings = bcm_enet_get_link_ksettings,
.set_link_ksettings = bcm_enet_set_link_ksettings,
};
static int bcm_enet_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
struct bcm_enet_priv *priv;
priv = netdev_priv(dev);
if (priv->has_phy) {
if (!dev->phydev)
return -ENODEV;
return phy_mii_ioctl(dev->phydev, rq, cmd);
} else {
struct mii_if_info mii;
mii.dev = dev;
mii.mdio_read = bcm_enet_mdio_read_mii;
mii.mdio_write = bcm_enet_mdio_write_mii;
mii.phy_id = 0;
mii.phy_id_mask = 0x3f;
mii.reg_num_mask = 0x1f;
return generic_mii_ioctl(&mii, if_mii(rq), cmd, NULL);
}
}
/*
* adjust mtu, can't be called while device is running
*/
static int bcm_enet_change_mtu(struct net_device *dev, int new_mtu)
{
struct bcm_enet_priv *priv = netdev_priv(dev);
int actual_mtu = new_mtu;
if (netif_running(dev))
return -EBUSY;
/* add ethernet header + vlan tag size */
actual_mtu += VLAN_ETH_HLEN;
/*
* setup maximum size before we get overflow mark in
* descriptor, note that this will not prevent reception of
* big frames, they will be split into multiple buffers
* anyway
*/
priv->hw_mtu = actual_mtu;
/*
* align rx buffer size to dma burst len, account FCS since
* it's appended
*/
priv->rx_buf_size = ALIGN(actual_mtu + ETH_FCS_LEN,
priv->dma_maxburst * 4);
priv->rx_frag_size = SKB_DATA_ALIGN(priv->rx_buf_offset + priv->rx_buf_size) +
SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
dev->mtu = new_mtu;
return 0;
}
/*
* preinit hardware to allow mii operation while device is down
*/
static void bcm_enet_hw_preinit(struct bcm_enet_priv *priv)
{
u32 val;
int limit;
/* make sure mac is disabled */
bcm_enet_disable_mac(priv);
/* soft reset mac */
val = ENET_CTL_SRESET_MASK;
enet_writel(priv, val, ENET_CTL_REG);
wmb();
limit = 1000;
do {
val = enet_readl(priv, ENET_CTL_REG);
if (!(val & ENET_CTL_SRESET_MASK))
break;
udelay(1);
} while (limit--);
/* select correct mii interface */
val = enet_readl(priv, ENET_CTL_REG);
if (priv->use_external_mii)
val |= ENET_CTL_EPHYSEL_MASK;
else
val &= ~ENET_CTL_EPHYSEL_MASK;
enet_writel(priv, val, ENET_CTL_REG);
/* turn on mdc clock */
enet_writel(priv, (0x1f << ENET_MIISC_MDCFREQDIV_SHIFT) |
ENET_MIISC_PREAMBLEEN_MASK, ENET_MIISC_REG);
/* set mib counters to self-clear when read */
val = enet_readl(priv, ENET_MIBCTL_REG);
val |= ENET_MIBCTL_RDCLEAR_MASK;
enet_writel(priv, val, ENET_MIBCTL_REG);
}
static const struct net_device_ops bcm_enet_ops = {
.ndo_open = bcm_enet_open,
.ndo_stop = bcm_enet_stop,
.ndo_start_xmit = bcm_enet_start_xmit,
.ndo_set_mac_address = bcm_enet_set_mac_address,
.ndo_set_rx_mode = bcm_enet_set_multicast_list,
.ndo_eth_ioctl = bcm_enet_ioctl,
.ndo_change_mtu = bcm_enet_change_mtu,
};
/*
* allocate netdevice, request register memory and register device.
*/
static int bcm_enet_probe(struct platform_device *pdev)
{
struct bcm_enet_priv *priv;
struct net_device *dev;
struct bcm63xx_enet_platform_data *pd;
int irq, irq_rx, irq_tx;
struct mii_bus *bus;
int i, ret;
if (!bcm_enet_shared_base[0])
return -EPROBE_DEFER;
irq = platform_get_irq(pdev, 0);
irq_rx = platform_get_irq(pdev, 1);
irq_tx = platform_get_irq(pdev, 2);
if (irq < 0 || irq_rx < 0 || irq_tx < 0)
return -ENODEV;
dev = alloc_etherdev(sizeof(*priv));
if (!dev)
return -ENOMEM;
priv = netdev_priv(dev);
priv->enet_is_sw = false;
priv->dma_maxburst = BCMENET_DMA_MAXBURST;
priv->rx_buf_offset = NET_SKB_PAD;
ret = bcm_enet_change_mtu(dev, dev->mtu);
if (ret)
goto out;
priv->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(priv->base)) {
ret = PTR_ERR(priv->base);
goto out;
}
dev->irq = priv->irq = irq;
priv->irq_rx = irq_rx;
priv->irq_tx = irq_tx;
priv->mac_clk = devm_clk_get(&pdev->dev, "enet");
if (IS_ERR(priv->mac_clk)) {
ret = PTR_ERR(priv->mac_clk);
goto out;
}
ret = clk_prepare_enable(priv->mac_clk);
if (ret)
goto out;
/* initialize default and fetch platform data */
priv->rx_ring_size = BCMENET_DEF_RX_DESC;
priv->tx_ring_size = BCMENET_DEF_TX_DESC;
pd = dev_get_platdata(&pdev->dev);
if (pd) {
eth_hw_addr_set(dev, pd->mac_addr);
priv->has_phy = pd->has_phy;
priv->phy_id = pd->phy_id;
priv->has_phy_interrupt = pd->has_phy_interrupt;
priv->phy_interrupt = pd->phy_interrupt;
priv->use_external_mii = !pd->use_internal_phy;
priv->pause_auto = pd->pause_auto;
priv->pause_rx = pd->pause_rx;
priv->pause_tx = pd->pause_tx;
priv->force_duplex_full = pd->force_duplex_full;
priv->force_speed_100 = pd->force_speed_100;
priv->dma_chan_en_mask = pd->dma_chan_en_mask;
priv->dma_chan_int_mask = pd->dma_chan_int_mask;
priv->dma_chan_width = pd->dma_chan_width;
priv->dma_has_sram = pd->dma_has_sram;
priv->dma_desc_shift = pd->dma_desc_shift;
priv->rx_chan = pd->rx_chan;
priv->tx_chan = pd->tx_chan;
}
if (priv->has_phy && !priv->use_external_mii) {
/* using internal PHY, enable clock */
priv->phy_clk = devm_clk_get(&pdev->dev, "ephy");
if (IS_ERR(priv->phy_clk)) {
ret = PTR_ERR(priv->phy_clk);
priv->phy_clk = NULL;
goto out_disable_clk_mac;
}
ret = clk_prepare_enable(priv->phy_clk);
if (ret)
goto out_disable_clk_mac;
}
/* do minimal hardware init to be able to probe mii bus */
bcm_enet_hw_preinit(priv);
/* MII bus registration */
if (priv->has_phy) {
priv->mii_bus = mdiobus_alloc();
if (!priv->mii_bus) {
ret = -ENOMEM;
goto out_uninit_hw;
}
bus = priv->mii_bus;
bus->name = "bcm63xx_enet MII bus";
bus->parent = &pdev->dev;
bus->priv = priv;
bus->read = bcm_enet_mdio_read_phylib;
bus->write = bcm_enet_mdio_write_phylib;
sprintf(bus->id, "%s-%d", pdev->name, pdev->id);
/* only probe bus where we think the PHY is, because
* the mdio read operation return 0 instead of 0xffff
* if a slave is not present on hw */
bus->phy_mask = ~(1 << priv->phy_id);
if (priv->has_phy_interrupt)
bus->irq[priv->phy_id] = priv->phy_interrupt;
ret = mdiobus_register(bus);
if (ret) {
dev_err(&pdev->dev, "unable to register mdio bus\n");
goto out_free_mdio;
}
} else {
/* run platform code to initialize PHY device */
if (pd && pd->mii_config &&
pd->mii_config(dev, 1, bcm_enet_mdio_read_mii,
bcm_enet_mdio_write_mii)) {
dev_err(&pdev->dev, "unable to configure mdio bus\n");
goto out_uninit_hw;
}
}
spin_lock_init(&priv->rx_lock);
/* init rx timeout (used for oom) */
timer_setup(&priv->rx_timeout, bcm_enet_refill_rx_timer, 0);
/* init the mib update lock&work */
mutex_init(&priv->mib_update_lock);
INIT_WORK(&priv->mib_update_task, bcm_enet_update_mib_counters_defer);
/* zero mib counters */
for (i = 0; i < ENET_MIB_REG_COUNT; i++)
enet_writel(priv, 0, ENET_MIB_REG(i));
/* register netdevice */
dev->netdev_ops = &bcm_enet_ops;
netif_napi_add_weight(dev, &priv->napi, bcm_enet_poll, 16);
dev->ethtool_ops = &bcm_enet_ethtool_ops;
/* MTU range: 46 - 2028 */
dev->min_mtu = ETH_ZLEN - ETH_HLEN;
dev->max_mtu = BCMENET_MAX_MTU - VLAN_ETH_HLEN;
SET_NETDEV_DEV(dev, &pdev->dev);
ret = register_netdev(dev);
if (ret)
goto out_unregister_mdio;
netif_carrier_off(dev);
platform_set_drvdata(pdev, dev);
priv->pdev = pdev;
priv->net_dev = dev;
return 0;
out_unregister_mdio:
if (priv->mii_bus)
mdiobus_unregister(priv->mii_bus);
out_free_mdio:
if (priv->mii_bus)
mdiobus_free(priv->mii_bus);
out_uninit_hw:
/* turn off mdc clock */
enet_writel(priv, 0, ENET_MIISC_REG);
clk_disable_unprepare(priv->phy_clk);
out_disable_clk_mac:
clk_disable_unprepare(priv->mac_clk);
out:
free_netdev(dev);
return ret;
}
/*
* exit func, stops hardware and unregisters netdevice
*/
static int bcm_enet_remove(struct platform_device *pdev)
{
struct bcm_enet_priv *priv;
struct net_device *dev;
/* stop netdevice */
dev = platform_get_drvdata(pdev);
priv = netdev_priv(dev);
unregister_netdev(dev);
/* turn off mdc clock */
enet_writel(priv, 0, ENET_MIISC_REG);
if (priv->has_phy) {
mdiobus_unregister(priv->mii_bus);
mdiobus_free(priv->mii_bus);
} else {
struct bcm63xx_enet_platform_data *pd;
pd = dev_get_platdata(&pdev->dev);
if (pd && pd->mii_config)
pd->mii_config(dev, 0, bcm_enet_mdio_read_mii,
bcm_enet_mdio_write_mii);
}
/* disable hw block clocks */
clk_disable_unprepare(priv->phy_clk);
clk_disable_unprepare(priv->mac_clk);
free_netdev(dev);
return 0;
}
static struct platform_driver bcm63xx_enet_driver = {
.probe = bcm_enet_probe,
.remove = bcm_enet_remove,
.driver = {
.name = "bcm63xx_enet",
},
};
/*
* switch mii access callbacks
*/
static int bcmenet_sw_mdio_read(struct bcm_enet_priv *priv,
int ext, int phy_id, int location)
{
u32 reg;
int ret;
spin_lock_bh(&priv->enetsw_mdio_lock);
enetsw_writel(priv, 0, ENETSW_MDIOC_REG);
reg = ENETSW_MDIOC_RD_MASK |
(phy_id << ENETSW_MDIOC_PHYID_SHIFT) |
(location << ENETSW_MDIOC_REG_SHIFT);
if (ext)
reg |= ENETSW_MDIOC_EXT_MASK;
enetsw_writel(priv, reg, ENETSW_MDIOC_REG);
udelay(50);
ret = enetsw_readw(priv, ENETSW_MDIOD_REG);
spin_unlock_bh(&priv->enetsw_mdio_lock);
return ret;
}
static void bcmenet_sw_mdio_write(struct bcm_enet_priv *priv,
int ext, int phy_id, int location,
uint16_t data)
{
u32 reg;
spin_lock_bh(&priv->enetsw_mdio_lock);
enetsw_writel(priv, 0, ENETSW_MDIOC_REG);
reg = ENETSW_MDIOC_WR_MASK |
(phy_id << ENETSW_MDIOC_PHYID_SHIFT) |
(location << ENETSW_MDIOC_REG_SHIFT);
if (ext)
reg |= ENETSW_MDIOC_EXT_MASK;
reg |= data;
enetsw_writel(priv, reg, ENETSW_MDIOC_REG);
udelay(50);
spin_unlock_bh(&priv->enetsw_mdio_lock);
}
static inline int bcm_enet_port_is_rgmii(int portid)
{
return portid >= ENETSW_RGMII_PORT0;
}
/*
* enet sw PHY polling
*/
static void swphy_poll_timer(struct timer_list *t)
{
struct bcm_enet_priv *priv = from_timer(priv, t, swphy_poll);
unsigned int i;
for (i = 0; i < priv->num_ports; i++) {
struct bcm63xx_enetsw_port *port;
int val, j, up, advertise, lpa, speed, duplex, media;
int external_phy = bcm_enet_port_is_rgmii(i);
u8 override;
port = &priv->used_ports[i];
if (!port->used)
continue;
if (port->bypass_link)
continue;
/* dummy read to clear */
for (j = 0; j < 2; j++)
val = bcmenet_sw_mdio_read(priv, external_phy,
port->phy_id, MII_BMSR);
if (val == 0xffff)
continue;
up = (val & BMSR_LSTATUS) ? 1 : 0;
if (!(up ^ priv->sw_port_link[i]))
continue;
priv->sw_port_link[i] = up;
/* link changed */
if (!up) {
dev_info(&priv->pdev->dev, "link DOWN on %s\n",
port->name);
enetsw_writeb(priv, ENETSW_PORTOV_ENABLE_MASK,
ENETSW_PORTOV_REG(i));
enetsw_writeb(priv, ENETSW_PTCTRL_RXDIS_MASK |
ENETSW_PTCTRL_TXDIS_MASK,
ENETSW_PTCTRL_REG(i));
continue;
}
advertise = bcmenet_sw_mdio_read(priv, external_phy,
port->phy_id, MII_ADVERTISE);
lpa = bcmenet_sw_mdio_read(priv, external_phy, port->phy_id,
MII_LPA);
/* figure out media and duplex from advertise and LPA values */
media = mii_nway_result(lpa & advertise);
duplex = (media & ADVERTISE_FULL) ? 1 : 0;
if (media & (ADVERTISE_100FULL | ADVERTISE_100HALF))
speed = 100;
else
speed = 10;
if (val & BMSR_ESTATEN) {
advertise = bcmenet_sw_mdio_read(priv, external_phy,
port->phy_id, MII_CTRL1000);
lpa = bcmenet_sw_mdio_read(priv, external_phy,
port->phy_id, MII_STAT1000);
if (advertise & (ADVERTISE_1000FULL | ADVERTISE_1000HALF)
&& lpa & (LPA_1000FULL | LPA_1000HALF)) {
speed = 1000;
duplex = (lpa & LPA_1000FULL);
}
}
dev_info(&priv->pdev->dev,
"link UP on %s, %dMbps, %s-duplex\n",
port->name, speed, duplex ? "full" : "half");
override = ENETSW_PORTOV_ENABLE_MASK |
ENETSW_PORTOV_LINKUP_MASK;
if (speed == 1000)
override |= ENETSW_IMPOV_1000_MASK;
else if (speed == 100)
override |= ENETSW_IMPOV_100_MASK;
if (duplex)
override |= ENETSW_IMPOV_FDX_MASK;
enetsw_writeb(priv, override, ENETSW_PORTOV_REG(i));
enetsw_writeb(priv, 0, ENETSW_PTCTRL_REG(i));
}
priv->swphy_poll.expires = jiffies + HZ;
add_timer(&priv->swphy_poll);
}
/*
* open callback, allocate dma rings & buffers and start rx operation
*/
static int bcm_enetsw_open(struct net_device *dev)
{
struct bcm_enet_priv *priv;
struct device *kdev;
int i, ret;
unsigned int size;
void *p;
u32 val;
priv = netdev_priv(dev);
kdev = &priv->pdev->dev;
/* mask all interrupts and request them */
enet_dmac_writel(priv, 0, ENETDMAC_IRMASK, priv->rx_chan);
enet_dmac_writel(priv, 0, ENETDMAC_IRMASK, priv->tx_chan);
ret = request_irq(priv->irq_rx, bcm_enet_isr_dma,
0, dev->name, dev);
if (ret)
goto out_freeirq;
if (priv->irq_tx != -1) {
ret = request_irq(priv->irq_tx, bcm_enet_isr_dma,
0, dev->name, dev);
if (ret)
goto out_freeirq_rx;
}
/* allocate rx dma ring */
size = priv->rx_ring_size * sizeof(struct bcm_enet_desc);
p = dma_alloc_coherent(kdev, size, &priv->rx_desc_dma, GFP_KERNEL);
if (!p) {
dev_err(kdev, "cannot allocate rx ring %u\n", size);
ret = -ENOMEM;
goto out_freeirq_tx;
}
priv->rx_desc_alloc_size = size;
priv->rx_desc_cpu = p;
/* allocate tx dma ring */
size = priv->tx_ring_size * sizeof(struct bcm_enet_desc);
p = dma_alloc_coherent(kdev, size, &priv->tx_desc_dma, GFP_KERNEL);
if (!p) {
dev_err(kdev, "cannot allocate tx ring\n");
ret = -ENOMEM;
goto out_free_rx_ring;
}
priv->tx_desc_alloc_size = size;
priv->tx_desc_cpu = p;
priv->tx_skb = kcalloc(priv->tx_ring_size, sizeof(struct sk_buff *),
GFP_KERNEL);
if (!priv->tx_skb) {
dev_err(kdev, "cannot allocate tx skb queue\n");
ret = -ENOMEM;
goto out_free_tx_ring;
}
priv->tx_desc_count = priv->tx_ring_size;
priv->tx_dirty_desc = 0;
priv->tx_curr_desc = 0;
spin_lock_init(&priv->tx_lock);
/* init & fill rx ring with buffers */
priv->rx_buf = kcalloc(priv->rx_ring_size, sizeof(void *),
GFP_KERNEL);
if (!priv->rx_buf) {
dev_err(kdev, "cannot allocate rx buffer queue\n");
ret = -ENOMEM;
goto out_free_tx_skb;
}
priv->rx_desc_count = 0;
priv->rx_dirty_desc = 0;
priv->rx_curr_desc = 0;
/* disable all ports */
for (i = 0; i < priv->num_ports; i++) {
enetsw_writeb(priv, ENETSW_PORTOV_ENABLE_MASK,
ENETSW_PORTOV_REG(i));
enetsw_writeb(priv, ENETSW_PTCTRL_RXDIS_MASK |
ENETSW_PTCTRL_TXDIS_MASK,
ENETSW_PTCTRL_REG(i));
priv->sw_port_link[i] = 0;
}
/* reset mib */
val = enetsw_readb(priv, ENETSW_GMCR_REG);
val |= ENETSW_GMCR_RST_MIB_MASK;
enetsw_writeb(priv, val, ENETSW_GMCR_REG);
mdelay(1);
val &= ~ENETSW_GMCR_RST_MIB_MASK;
enetsw_writeb(priv, val, ENETSW_GMCR_REG);
mdelay(1);
/* force CPU port state */
val = enetsw_readb(priv, ENETSW_IMPOV_REG);
val |= ENETSW_IMPOV_FORCE_MASK | ENETSW_IMPOV_LINKUP_MASK;
enetsw_writeb(priv, val, ENETSW_IMPOV_REG);
/* enable switch forward engine */
val = enetsw_readb(priv, ENETSW_SWMODE_REG);
val |= ENETSW_SWMODE_FWD_EN_MASK;
enetsw_writeb(priv, val, ENETSW_SWMODE_REG);
/* enable jumbo on all ports */
enetsw_writel(priv, 0x1ff, ENETSW_JMBCTL_PORT_REG);
enetsw_writew(priv, 9728, ENETSW_JMBCTL_MAXSIZE_REG);
/* initialize flow control buffer allocation */
enet_dma_writel(priv, ENETDMA_BUFALLOC_FORCE_MASK | 0,
ENETDMA_BUFALLOC_REG(priv->rx_chan));
if (bcm_enet_refill_rx(dev, false)) {
dev_err(kdev, "cannot allocate rx buffer queue\n");
ret = -ENOMEM;
goto out;
}
/* write rx & tx ring addresses */
enet_dmas_writel(priv, priv->rx_desc_dma,
ENETDMAS_RSTART_REG, priv->rx_chan);
enet_dmas_writel(priv, priv->tx_desc_dma,
ENETDMAS_RSTART_REG, priv->tx_chan);
/* clear remaining state ram for rx & tx channel */
enet_dmas_writel(priv, 0, ENETDMAS_SRAM2_REG, priv->rx_chan);
enet_dmas_writel(priv, 0, ENETDMAS_SRAM2_REG, priv->tx_chan);
enet_dmas_writel(priv, 0, ENETDMAS_SRAM3_REG, priv->rx_chan);
enet_dmas_writel(priv, 0, ENETDMAS_SRAM3_REG, priv->tx_chan);
enet_dmas_writel(priv, 0, ENETDMAS_SRAM4_REG, priv->rx_chan);
enet_dmas_writel(priv, 0, ENETDMAS_SRAM4_REG, priv->tx_chan);
/* set dma maximum burst len */
enet_dmac_writel(priv, priv->dma_maxburst,
ENETDMAC_MAXBURST, priv->rx_chan);
enet_dmac_writel(priv, priv->dma_maxburst,
ENETDMAC_MAXBURST, priv->tx_chan);
/* set flow control low/high threshold to 1/3 / 2/3 */
val = priv->rx_ring_size / 3;
enet_dma_writel(priv, val, ENETDMA_FLOWCL_REG(priv->rx_chan));
val = (priv->rx_ring_size * 2) / 3;
enet_dma_writel(priv, val, ENETDMA_FLOWCH_REG(priv->rx_chan));
/* all set, enable mac and interrupts, start dma engine and
* kick rx dma channel
*/
wmb();
enet_dma_writel(priv, ENETDMA_CFG_EN_MASK, ENETDMA_CFG_REG);
enet_dmac_writel(priv, ENETDMAC_CHANCFG_EN_MASK,
ENETDMAC_CHANCFG, priv->rx_chan);
/* watch "packet transferred" interrupt in rx and tx */
enet_dmac_writel(priv, ENETDMAC_IR_PKTDONE_MASK,
ENETDMAC_IR, priv->rx_chan);
enet_dmac_writel(priv, ENETDMAC_IR_PKTDONE_MASK,
ENETDMAC_IR, priv->tx_chan);
/* make sure we enable napi before rx interrupt */
napi_enable(&priv->napi);
enet_dmac_writel(priv, ENETDMAC_IR_PKTDONE_MASK,
ENETDMAC_IRMASK, priv->rx_chan);
enet_dmac_writel(priv, ENETDMAC_IR_PKTDONE_MASK,
ENETDMAC_IRMASK, priv->tx_chan);
netif_carrier_on(dev);
netif_start_queue(dev);
/* apply override config for bypass_link ports here. */
for (i = 0; i < priv->num_ports; i++) {
struct bcm63xx_enetsw_port *port;
u8 override;
port = &priv->used_ports[i];
if (!port->used)
continue;
if (!port->bypass_link)
continue;
override = ENETSW_PORTOV_ENABLE_MASK |
ENETSW_PORTOV_LINKUP_MASK;
switch (port->force_speed) {
case 1000:
override |= ENETSW_IMPOV_1000_MASK;
break;
case 100:
override |= ENETSW_IMPOV_100_MASK;
break;
case 10:
break;
default:
pr_warn("invalid forced speed on port %s: assume 10\n",
port->name);
break;
}
if (port->force_duplex_full)
override |= ENETSW_IMPOV_FDX_MASK;
enetsw_writeb(priv, override, ENETSW_PORTOV_REG(i));
enetsw_writeb(priv, 0, ENETSW_PTCTRL_REG(i));
}
/* start phy polling timer */
timer_setup(&priv->swphy_poll, swphy_poll_timer, 0);
mod_timer(&priv->swphy_poll, jiffies);
return 0;
out:
bcm_enet_free_rx_buf_ring(kdev, priv);
out_free_tx_skb:
kfree(priv->tx_skb);
out_free_tx_ring:
dma_free_coherent(kdev, priv->tx_desc_alloc_size,
priv->tx_desc_cpu, priv->tx_desc_dma);
out_free_rx_ring:
dma_free_coherent(kdev, priv->rx_desc_alloc_size,
priv->rx_desc_cpu, priv->rx_desc_dma);
out_freeirq_tx:
if (priv->irq_tx != -1)
free_irq(priv->irq_tx, dev);
out_freeirq_rx:
free_irq(priv->irq_rx, dev);
out_freeirq:
return ret;
}
/* stop callback */
static int bcm_enetsw_stop(struct net_device *dev)
{
struct bcm_enet_priv *priv;
struct device *kdev;
priv = netdev_priv(dev);
kdev = &priv->pdev->dev;
del_timer_sync(&priv->swphy_poll);
netif_stop_queue(dev);
napi_disable(&priv->napi);
del_timer_sync(&priv->rx_timeout);
/* mask all interrupts */
enet_dmac_writel(priv, 0, ENETDMAC_IRMASK, priv->rx_chan);
enet_dmac_writel(priv, 0, ENETDMAC_IRMASK, priv->tx_chan);
/* disable dma & mac */
bcm_enet_disable_dma(priv, priv->tx_chan);
bcm_enet_disable_dma(priv, priv->rx_chan);
/* force reclaim of all tx buffers */
bcm_enet_tx_reclaim(dev, 1, 0);
/* free the rx buffer ring */
bcm_enet_free_rx_buf_ring(kdev, priv);
/* free remaining allocated memory */
kfree(priv->tx_skb);
dma_free_coherent(kdev, priv->rx_desc_alloc_size,
priv->rx_desc_cpu, priv->rx_desc_dma);
dma_free_coherent(kdev, priv->tx_desc_alloc_size,
priv->tx_desc_cpu, priv->tx_desc_dma);
if (priv->irq_tx != -1)
free_irq(priv->irq_tx, dev);
free_irq(priv->irq_rx, dev);
/* reset BQL after forced tx reclaim to prevent kernel panic */
netdev_reset_queue(dev);
return 0;
}
/* try to sort out phy external status by walking the used_port field
* in the bcm_enet_priv structure. in case the phy address is not
* assigned to any physical port on the switch, assume it is external
* (and yell at the user).
*/
static int bcm_enetsw_phy_is_external(struct bcm_enet_priv *priv, int phy_id)
{
int i;
for (i = 0; i < priv->num_ports; ++i) {
if (!priv->used_ports[i].used)
continue;
if (priv->used_ports[i].phy_id == phy_id)
return bcm_enet_port_is_rgmii(i);
}
printk_once(KERN_WARNING "bcm63xx_enet: could not find a used port with phy_id %i, assuming phy is external\n",
phy_id);
return 1;
}
/* can't use bcmenet_sw_mdio_read directly as we need to sort out
* external/internal status of the given phy_id first.
*/
static int bcm_enetsw_mii_mdio_read(struct net_device *dev, int phy_id,
int location)
{
struct bcm_enet_priv *priv;
priv = netdev_priv(dev);
return bcmenet_sw_mdio_read(priv,
bcm_enetsw_phy_is_external(priv, phy_id),
phy_id, location);
}
/* can't use bcmenet_sw_mdio_write directly as we need to sort out
* external/internal status of the given phy_id first.
*/
static void bcm_enetsw_mii_mdio_write(struct net_device *dev, int phy_id,
int location,
int val)
{
struct bcm_enet_priv *priv;
priv = netdev_priv(dev);
bcmenet_sw_mdio_write(priv, bcm_enetsw_phy_is_external(priv, phy_id),
phy_id, location, val);
}
static int bcm_enetsw_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
struct mii_if_info mii;
mii.dev = dev;
mii.mdio_read = bcm_enetsw_mii_mdio_read;
mii.mdio_write = bcm_enetsw_mii_mdio_write;
mii.phy_id = 0;
mii.phy_id_mask = 0x3f;
mii.reg_num_mask = 0x1f;
return generic_mii_ioctl(&mii, if_mii(rq), cmd, NULL);
}
static const struct net_device_ops bcm_enetsw_ops = {
.ndo_open = bcm_enetsw_open,
.ndo_stop = bcm_enetsw_stop,
.ndo_start_xmit = bcm_enet_start_xmit,
.ndo_change_mtu = bcm_enet_change_mtu,
.ndo_eth_ioctl = bcm_enetsw_ioctl,
};
static const struct bcm_enet_stats bcm_enetsw_gstrings_stats[] = {
{ "rx_packets", DEV_STAT(rx_packets), -1 },
{ "tx_packets", DEV_STAT(tx_packets), -1 },
{ "rx_bytes", DEV_STAT(rx_bytes), -1 },
{ "tx_bytes", DEV_STAT(tx_bytes), -1 },
{ "rx_errors", DEV_STAT(rx_errors), -1 },
{ "tx_errors", DEV_STAT(tx_errors), -1 },
{ "rx_dropped", DEV_STAT(rx_dropped), -1 },
{ "tx_dropped", DEV_STAT(tx_dropped), -1 },
{ "tx_good_octets", GEN_STAT(mib.tx_gd_octets), ETHSW_MIB_RX_GD_OCT },
{ "tx_unicast", GEN_STAT(mib.tx_unicast), ETHSW_MIB_RX_BRDCAST },
{ "tx_broadcast", GEN_STAT(mib.tx_brdcast), ETHSW_MIB_RX_BRDCAST },
{ "tx_multicast", GEN_STAT(mib.tx_mult), ETHSW_MIB_RX_MULT },
{ "tx_64_octets", GEN_STAT(mib.tx_64), ETHSW_MIB_RX_64 },
{ "tx_65_127_oct", GEN_STAT(mib.tx_65_127), ETHSW_MIB_RX_65_127 },
{ "tx_128_255_oct", GEN_STAT(mib.tx_128_255), ETHSW_MIB_RX_128_255 },
{ "tx_256_511_oct", GEN_STAT(mib.tx_256_511), ETHSW_MIB_RX_256_511 },
{ "tx_512_1023_oct", GEN_STAT(mib.tx_512_1023), ETHSW_MIB_RX_512_1023},
{ "tx_1024_1522_oct", GEN_STAT(mib.tx_1024_max),
ETHSW_MIB_RX_1024_1522 },
{ "tx_1523_2047_oct", GEN_STAT(mib.tx_1523_2047),
ETHSW_MIB_RX_1523_2047 },
{ "tx_2048_4095_oct", GEN_STAT(mib.tx_2048_4095),
ETHSW_MIB_RX_2048_4095 },
{ "tx_4096_8191_oct", GEN_STAT(mib.tx_4096_8191),
ETHSW_MIB_RX_4096_8191 },
{ "tx_8192_9728_oct", GEN_STAT(mib.tx_8192_9728),
ETHSW_MIB_RX_8192_9728 },
{ "tx_oversize", GEN_STAT(mib.tx_ovr), ETHSW_MIB_RX_OVR },
{ "tx_oversize_drop", GEN_STAT(mib.tx_ovr), ETHSW_MIB_RX_OVR_DISC },
{ "tx_dropped", GEN_STAT(mib.tx_drop), ETHSW_MIB_RX_DROP },
{ "tx_undersize", GEN_STAT(mib.tx_underrun), ETHSW_MIB_RX_UND },
{ "tx_pause", GEN_STAT(mib.tx_pause), ETHSW_MIB_RX_PAUSE },
{ "rx_good_octets", GEN_STAT(mib.rx_gd_octets), ETHSW_MIB_TX_ALL_OCT },
{ "rx_broadcast", GEN_STAT(mib.rx_brdcast), ETHSW_MIB_TX_BRDCAST },
{ "rx_multicast", GEN_STAT(mib.rx_mult), ETHSW_MIB_TX_MULT },
{ "rx_unicast", GEN_STAT(mib.rx_unicast), ETHSW_MIB_TX_MULT },
{ "rx_pause", GEN_STAT(mib.rx_pause), ETHSW_MIB_TX_PAUSE },
{ "rx_dropped", GEN_STAT(mib.rx_drop), ETHSW_MIB_TX_DROP_PKTS },
};
#define BCM_ENETSW_STATS_LEN \
(sizeof(bcm_enetsw_gstrings_stats) / sizeof(struct bcm_enet_stats))
static void bcm_enetsw_get_strings(struct net_device *netdev,
u32 stringset, u8 *data)
{
int i;
switch (stringset) {
case ETH_SS_STATS:
for (i = 0; i < BCM_ENETSW_STATS_LEN; i++) {
memcpy(data + i * ETH_GSTRING_LEN,
bcm_enetsw_gstrings_stats[i].stat_string,
ETH_GSTRING_LEN);
}
break;
}
}
static int bcm_enetsw_get_sset_count(struct net_device *netdev,
int string_set)
{
switch (string_set) {
case ETH_SS_STATS:
return BCM_ENETSW_STATS_LEN;
default:
return -EINVAL;
}
}
static void bcm_enetsw_get_drvinfo(struct net_device *netdev,
struct ethtool_drvinfo *drvinfo)
{
strncpy(drvinfo->driver, bcm_enet_driver_name, sizeof(drvinfo->driver));
strncpy(drvinfo->bus_info, "bcm63xx", sizeof(drvinfo->bus_info));
}
static void bcm_enetsw_get_ethtool_stats(struct net_device *netdev,
struct ethtool_stats *stats,
u64 *data)
{
struct bcm_enet_priv *priv;
int i;
priv = netdev_priv(netdev);
for (i = 0; i < BCM_ENETSW_STATS_LEN; i++) {
const struct bcm_enet_stats *s;
u32 lo, hi;
char *p;
int reg;
s = &bcm_enetsw_gstrings_stats[i];
reg = s->mib_reg;
if (reg == -1)
continue;
lo = enetsw_readl(priv, ENETSW_MIB_REG(reg));
p = (char *)priv + s->stat_offset;
if (s->sizeof_stat == sizeof(u64)) {
hi = enetsw_readl(priv, ENETSW_MIB_REG(reg + 1));
*(u64 *)p = ((u64)hi << 32 | lo);
} else {
*(u32 *)p = lo;
}
}
for (i = 0; i < BCM_ENETSW_STATS_LEN; i++) {
const struct bcm_enet_stats *s;
char *p;
s = &bcm_enetsw_gstrings_stats[i];
if (s->mib_reg == -1)
p = (char *)&netdev->stats + s->stat_offset;
else
p = (char *)priv + s->stat_offset;
data[i] = (s->sizeof_stat == sizeof(u64)) ?
*(u64 *)p : *(u32 *)p;
}
}
static void
bcm_enetsw_get_ringparam(struct net_device *dev,
struct ethtool_ringparam *ering,
struct kernel_ethtool_ringparam *kernel_ering,
struct netlink_ext_ack *extack)
{
struct bcm_enet_priv *priv;
priv = netdev_priv(dev);
/* rx/tx ring is actually only limited by memory */
ering->rx_max_pending = 8192;
ering->tx_max_pending = 8192;
ering->rx_mini_max_pending = 0;
ering->rx_jumbo_max_pending = 0;
ering->rx_pending = priv->rx_ring_size;
ering->tx_pending = priv->tx_ring_size;
}
static int
bcm_enetsw_set_ringparam(struct net_device *dev,
struct ethtool_ringparam *ering,
struct kernel_ethtool_ringparam *kernel_ering,
struct netlink_ext_ack *extack)
{
struct bcm_enet_priv *priv;
int was_running;
priv = netdev_priv(dev);
was_running = 0;
if (netif_running(dev)) {
bcm_enetsw_stop(dev);
was_running = 1;
}
priv->rx_ring_size = ering->rx_pending;
priv->tx_ring_size = ering->tx_pending;
if (was_running) {
int err;
err = bcm_enetsw_open(dev);
if (err)
dev_close(dev);
}
return 0;
}
static const struct ethtool_ops bcm_enetsw_ethtool_ops = {
.get_strings = bcm_enetsw_get_strings,
.get_sset_count = bcm_enetsw_get_sset_count,
.get_ethtool_stats = bcm_enetsw_get_ethtool_stats,
.get_drvinfo = bcm_enetsw_get_drvinfo,
.get_ringparam = bcm_enetsw_get_ringparam,
.set_ringparam = bcm_enetsw_set_ringparam,
};
/* allocate netdevice, request register memory and register device. */
static int bcm_enetsw_probe(struct platform_device *pdev)
{
struct bcm_enet_priv *priv;
struct net_device *dev;
struct bcm63xx_enetsw_platform_data *pd;
struct resource *res_mem;
int ret, irq_rx, irq_tx;
if (!bcm_enet_shared_base[0])
return -EPROBE_DEFER;
res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
irq_rx = platform_get_irq(pdev, 0);
irq_tx = platform_get_irq(pdev, 1);
if (!res_mem || irq_rx < 0)
return -ENODEV;
dev = alloc_etherdev(sizeof(*priv));
if (!dev)
return -ENOMEM;
priv = netdev_priv(dev);
/* initialize default and fetch platform data */
priv->enet_is_sw = true;
priv->irq_rx = irq_rx;
priv->irq_tx = irq_tx;
priv->rx_ring_size = BCMENET_DEF_RX_DESC;
priv->tx_ring_size = BCMENET_DEF_TX_DESC;
priv->dma_maxburst = BCMENETSW_DMA_MAXBURST;
priv->rx_buf_offset = NET_SKB_PAD + NET_IP_ALIGN;
pd = dev_get_platdata(&pdev->dev);
if (pd) {
eth_hw_addr_set(dev, pd->mac_addr);
memcpy(priv->used_ports, pd->used_ports,
sizeof(pd->used_ports));
priv->num_ports = pd->num_ports;
priv->dma_has_sram = pd->dma_has_sram;
priv->dma_chan_en_mask = pd->dma_chan_en_mask;
priv->dma_chan_int_mask = pd->dma_chan_int_mask;
priv->dma_chan_width = pd->dma_chan_width;
}
ret = bcm_enet_change_mtu(dev, dev->mtu);
if (ret)
goto out;
priv->base = devm_ioremap_resource(&pdev->dev, res_mem);
if (IS_ERR(priv->base)) {
ret = PTR_ERR(priv->base);
goto out;
}
priv->mac_clk = devm_clk_get(&pdev->dev, "enetsw");
if (IS_ERR(priv->mac_clk)) {
ret = PTR_ERR(priv->mac_clk);
goto out;
}
ret = clk_prepare_enable(priv->mac_clk);
if (ret)
goto out;
priv->rx_chan = 0;
priv->tx_chan = 1;
spin_lock_init(&priv->rx_lock);
/* init rx timeout (used for oom) */
timer_setup(&priv->rx_timeout, bcm_enet_refill_rx_timer, 0);
/* register netdevice */
dev->netdev_ops = &bcm_enetsw_ops;
netif_napi_add_weight(dev, &priv->napi, bcm_enet_poll, 16);
dev->ethtool_ops = &bcm_enetsw_ethtool_ops;
SET_NETDEV_DEV(dev, &pdev->dev);
spin_lock_init(&priv->enetsw_mdio_lock);
ret = register_netdev(dev);
if (ret)
goto out_disable_clk;
netif_carrier_off(dev);
platform_set_drvdata(pdev, dev);
priv->pdev = pdev;
priv->net_dev = dev;
return 0;
out_disable_clk:
clk_disable_unprepare(priv->mac_clk);
out:
free_netdev(dev);
return ret;
}
/* exit func, stops hardware and unregisters netdevice */
static int bcm_enetsw_remove(struct platform_device *pdev)
{
struct bcm_enet_priv *priv;
struct net_device *dev;
/* stop netdevice */
dev = platform_get_drvdata(pdev);
priv = netdev_priv(dev);
unregister_netdev(dev);
clk_disable_unprepare(priv->mac_clk);
free_netdev(dev);
return 0;
}
static struct platform_driver bcm63xx_enetsw_driver = {
.probe = bcm_enetsw_probe,
.remove = bcm_enetsw_remove,
.driver = {
.name = "bcm63xx_enetsw",
},
};
/* reserve & remap memory space shared between all macs */
static int bcm_enet_shared_probe(struct platform_device *pdev)
{
void __iomem *p[3];
unsigned int i;
memset(bcm_enet_shared_base, 0, sizeof(bcm_enet_shared_base));
for (i = 0; i < 3; i++) {
p[i] = devm_platform_ioremap_resource(pdev, i);
if (IS_ERR(p[i]))
return PTR_ERR(p[i]);
}
memcpy(bcm_enet_shared_base, p, sizeof(bcm_enet_shared_base));
return 0;
}
/* this "shared" driver is needed because both macs share a single
* address space
*/
struct platform_driver bcm63xx_enet_shared_driver = {
.probe = bcm_enet_shared_probe,
.driver = {
.name = "bcm63xx_enet_shared",
},
};
static struct platform_driver * const drivers[] = {
&bcm63xx_enet_shared_driver,
&bcm63xx_enet_driver,
&bcm63xx_enetsw_driver,
};
/* entry point */
static int __init bcm_enet_init(void)
{
return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
}
static void __exit bcm_enet_exit(void)
{
platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
}
module_init(bcm_enet_init);
module_exit(bcm_enet_exit);
MODULE_DESCRIPTION("BCM63xx internal ethernet mac driver");
MODULE_AUTHOR("Maxime Bizon <mbizon@freebox.fr>");
MODULE_LICENSE("GPL");