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linux/drivers/net/fec_mpc52xx.c
Asier Llano 1e4e0767ec net/mpc5200: Fix locking on fec_mpc52xx driver 
Fix the locking scheme on the fec_mpc52xx driver.  This device can
receive IRQs from three sources; the FEC itself, the tx DMA, and the
rx DMA.  Mutual exclusion was handled by taking a spin_lock() in the
critical regions, but because the handlers are run with IRQs enabled,
spin_lock() is insufficient and the driver can end up interrupting
a critical region anyway from another IRQ.

Asier Llano discovered that this occurs when an error IRQ is raised
in the middle of handling rx irqs which resulted in an sk_buff memory
leak.

In addition, locking is spotty at best in the driver and inspection
revealed quite a few places with insufficient locking.

This patch is based on Asier's initial work, but reworks a number of
things so that locks are held for as short a time as possible, so
that spin_lock_irqsave() is used everywhere, and so the locks are
dropped when calling into the network stack (because the lock only
protects the hardware interface; not the network stack).

Boot tested on a lite5200 with an NFS root.  Has not been performance
tested.

Signed-off-by: Asier Llano <a.llano@ziv.es>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-12-08 20:29:10 -08:00

1116 lines
29 KiB
C
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/*
* Driver for the MPC5200 Fast Ethernet Controller
*
* Originally written by Dale Farnsworth <dfarnsworth@mvista.com> and
* now maintained by Sylvain Munaut <tnt@246tNt.com>
*
* Copyright (C) 2007 Domen Puncer, Telargo, Inc.
* Copyright (C) 2007 Sylvain Munaut <tnt@246tNt.com>
* Copyright (C) 2003-2004 MontaVista, Software, Inc.
*
* 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/spinlock.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/crc32.h>
#include <linux/hardirq.h>
#include <linux/delay.h>
#include <linux/of_device.h>
#include <linux/of_mdio.h>
#include <linux/of_platform.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/skbuff.h>
#include <asm/io.h>
#include <asm/delay.h>
#include <asm/mpc52xx.h>
#include <sysdev/bestcomm/bestcomm.h>
#include <sysdev/bestcomm/fec.h>
#include "fec_mpc52xx.h"
#define DRIVER_NAME "mpc52xx-fec"
/* Private driver data structure */
struct mpc52xx_fec_priv {
struct net_device *ndev;
int duplex;
int speed;
int r_irq;
int t_irq;
struct mpc52xx_fec __iomem *fec;
struct bcom_task *rx_dmatsk;
struct bcom_task *tx_dmatsk;
spinlock_t lock;
int msg_enable;
/* MDIO link details */
unsigned int mdio_speed;
struct device_node *phy_node;
struct phy_device *phydev;
enum phy_state link;
int seven_wire_mode;
};
static irqreturn_t mpc52xx_fec_interrupt(int, void *);
static irqreturn_t mpc52xx_fec_rx_interrupt(int, void *);
static irqreturn_t mpc52xx_fec_tx_interrupt(int, void *);
static void mpc52xx_fec_stop(struct net_device *dev);
static void mpc52xx_fec_start(struct net_device *dev);
static void mpc52xx_fec_reset(struct net_device *dev);
static u8 mpc52xx_fec_mac_addr[6];
module_param_array_named(mac, mpc52xx_fec_mac_addr, byte, NULL, 0);
MODULE_PARM_DESC(mac, "six hex digits, ie. 0x1,0x2,0xc0,0x01,0xba,0xbe");
#define MPC52xx_MESSAGES_DEFAULT ( NETIF_MSG_DRV | NETIF_MSG_PROBE | \
NETIF_MSG_LINK | NETIF_MSG_IFDOWN | NETIF_MSG_IFUP)
static int debug = -1; /* the above default */
module_param(debug, int, 0);
MODULE_PARM_DESC(debug, "debugging messages level");
static void mpc52xx_fec_tx_timeout(struct net_device *dev)
{
struct mpc52xx_fec_priv *priv = netdev_priv(dev);
unsigned long flags;
dev_warn(&dev->dev, "transmit timed out\n");
spin_lock_irqsave(&priv->lock, flags);
mpc52xx_fec_reset(dev);
dev->stats.tx_errors++;
spin_unlock_irqrestore(&priv->lock, flags);
netif_wake_queue(dev);
}
static void mpc52xx_fec_set_paddr(struct net_device *dev, u8 *mac)
{
struct mpc52xx_fec_priv *priv = netdev_priv(dev);
struct mpc52xx_fec __iomem *fec = priv->fec;
out_be32(&fec->paddr1, *(u32 *)(&mac[0]));
out_be32(&fec->paddr2, (*(u16 *)(&mac[4]) << 16) | FEC_PADDR2_TYPE);
}
static void mpc52xx_fec_get_paddr(struct net_device *dev, u8 *mac)
{
struct mpc52xx_fec_priv *priv = netdev_priv(dev);
struct mpc52xx_fec __iomem *fec = priv->fec;
*(u32 *)(&mac[0]) = in_be32(&fec->paddr1);
*(u16 *)(&mac[4]) = in_be32(&fec->paddr2) >> 16;
}
static int mpc52xx_fec_set_mac_address(struct net_device *dev, void *addr)
{
struct sockaddr *sock = addr;
memcpy(dev->dev_addr, sock->sa_data, dev->addr_len);
mpc52xx_fec_set_paddr(dev, sock->sa_data);
return 0;
}
static void mpc52xx_fec_free_rx_buffers(struct net_device *dev, struct bcom_task *s)
{
while (!bcom_queue_empty(s)) {
struct bcom_fec_bd *bd;
struct sk_buff *skb;
skb = bcom_retrieve_buffer(s, NULL, (struct bcom_bd **)&bd);
dma_unmap_single(dev->dev.parent, bd->skb_pa, skb->len,
DMA_FROM_DEVICE);
kfree_skb(skb);
}
}
static void
mpc52xx_fec_rx_submit(struct net_device *dev, struct sk_buff *rskb)
{
struct mpc52xx_fec_priv *priv = netdev_priv(dev);
struct bcom_fec_bd *bd;
bd = (struct bcom_fec_bd *) bcom_prepare_next_buffer(priv->rx_dmatsk);
bd->status = FEC_RX_BUFFER_SIZE;
bd->skb_pa = dma_map_single(dev->dev.parent, rskb->data,
FEC_RX_BUFFER_SIZE, DMA_FROM_DEVICE);
bcom_submit_next_buffer(priv->rx_dmatsk, rskb);
}
static int mpc52xx_fec_alloc_rx_buffers(struct net_device *dev, struct bcom_task *rxtsk)
{
struct sk_buff *skb;
while (!bcom_queue_full(rxtsk)) {
skb = dev_alloc_skb(FEC_RX_BUFFER_SIZE);
if (!skb)
return -EAGAIN;
/* zero out the initial receive buffers to aid debugging */
memset(skb->data, 0, FEC_RX_BUFFER_SIZE);
mpc52xx_fec_rx_submit(dev, skb);
}
return 0;
}
/* based on generic_adjust_link from fs_enet-main.c */
static void mpc52xx_fec_adjust_link(struct net_device *dev)
{
struct mpc52xx_fec_priv *priv = netdev_priv(dev);
struct phy_device *phydev = priv->phydev;
int new_state = 0;
if (phydev->link != PHY_DOWN) {
if (phydev->duplex != priv->duplex) {
struct mpc52xx_fec __iomem *fec = priv->fec;
u32 rcntrl;
u32 tcntrl;
new_state = 1;
priv->duplex = phydev->duplex;
rcntrl = in_be32(&fec->r_cntrl);
tcntrl = in_be32(&fec->x_cntrl);
rcntrl &= ~FEC_RCNTRL_DRT;
tcntrl &= ~FEC_TCNTRL_FDEN;
if (phydev->duplex == DUPLEX_FULL)
tcntrl |= FEC_TCNTRL_FDEN; /* FD enable */
else
rcntrl |= FEC_RCNTRL_DRT; /* disable Rx on Tx (HD) */
out_be32(&fec->r_cntrl, rcntrl);
out_be32(&fec->x_cntrl, tcntrl);
}
if (phydev->speed != priv->speed) {
new_state = 1;
priv->speed = phydev->speed;
}
if (priv->link == PHY_DOWN) {
new_state = 1;
priv->link = phydev->link;
}
} else if (priv->link) {
new_state = 1;
priv->link = PHY_DOWN;
priv->speed = 0;
priv->duplex = -1;
}
if (new_state && netif_msg_link(priv))
phy_print_status(phydev);
}
static int mpc52xx_fec_open(struct net_device *dev)
{
struct mpc52xx_fec_priv *priv = netdev_priv(dev);
int err = -EBUSY;
if (priv->phy_node) {
priv->phydev = of_phy_connect(priv->ndev, priv->phy_node,
mpc52xx_fec_adjust_link, 0, 0);
if (!priv->phydev) {
dev_err(&dev->dev, "of_phy_connect failed\n");
return -ENODEV;
}
phy_start(priv->phydev);
}
if (request_irq(dev->irq, mpc52xx_fec_interrupt, IRQF_SHARED,
DRIVER_NAME "_ctrl", dev)) {
dev_err(&dev->dev, "ctrl interrupt request failed\n");
goto free_phy;
}
if (request_irq(priv->r_irq, mpc52xx_fec_rx_interrupt, 0,
DRIVER_NAME "_rx", dev)) {
dev_err(&dev->dev, "rx interrupt request failed\n");
goto free_ctrl_irq;
}
if (request_irq(priv->t_irq, mpc52xx_fec_tx_interrupt, 0,
DRIVER_NAME "_tx", dev)) {
dev_err(&dev->dev, "tx interrupt request failed\n");
goto free_2irqs;
}
bcom_fec_rx_reset(priv->rx_dmatsk);
bcom_fec_tx_reset(priv->tx_dmatsk);
err = mpc52xx_fec_alloc_rx_buffers(dev, priv->rx_dmatsk);
if (err) {
dev_err(&dev->dev, "mpc52xx_fec_alloc_rx_buffers failed\n");
goto free_irqs;
}
bcom_enable(priv->rx_dmatsk);
bcom_enable(priv->tx_dmatsk);
mpc52xx_fec_start(dev);
netif_start_queue(dev);
return 0;
free_irqs:
free_irq(priv->t_irq, dev);
free_2irqs:
free_irq(priv->r_irq, dev);
free_ctrl_irq:
free_irq(dev->irq, dev);
free_phy:
if (priv->phydev) {
phy_stop(priv->phydev);
phy_disconnect(priv->phydev);
priv->phydev = NULL;
}
return err;
}
static int mpc52xx_fec_close(struct net_device *dev)
{
struct mpc52xx_fec_priv *priv = netdev_priv(dev);
netif_stop_queue(dev);
mpc52xx_fec_stop(dev);
mpc52xx_fec_free_rx_buffers(dev, priv->rx_dmatsk);
free_irq(dev->irq, dev);
free_irq(priv->r_irq, dev);
free_irq(priv->t_irq, dev);
if (priv->phydev) {
/* power down phy */
phy_stop(priv->phydev);
phy_disconnect(priv->phydev);
priv->phydev = NULL;
}
return 0;
}
/* This will only be invoked if your driver is _not_ in XOFF state.
* What this means is that you need not check it, and that this
* invariant will hold if you make sure that the netif_*_queue()
* calls are done at the proper times.
*/
static int mpc52xx_fec_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct mpc52xx_fec_priv *priv = netdev_priv(dev);
struct bcom_fec_bd *bd;
unsigned long flags;
if (bcom_queue_full(priv->tx_dmatsk)) {
if (net_ratelimit())
dev_err(&dev->dev, "transmit queue overrun\n");
return NETDEV_TX_BUSY;
}
spin_lock_irqsave(&priv->lock, flags);
dev->trans_start = jiffies;
bd = (struct bcom_fec_bd *)
bcom_prepare_next_buffer(priv->tx_dmatsk);
bd->status = skb->len | BCOM_FEC_TX_BD_TFD | BCOM_FEC_TX_BD_TC;
bd->skb_pa = dma_map_single(dev->dev.parent, skb->data, skb->len,
DMA_TO_DEVICE);
bcom_submit_next_buffer(priv->tx_dmatsk, skb);
spin_unlock_irqrestore(&priv->lock, flags);
if (bcom_queue_full(priv->tx_dmatsk)) {
netif_stop_queue(dev);
}
return NETDEV_TX_OK;
}
#ifdef CONFIG_NET_POLL_CONTROLLER
static void mpc52xx_fec_poll_controller(struct net_device *dev)
{
struct mpc52xx_fec_priv *priv = netdev_priv(dev);
disable_irq(priv->t_irq);
mpc52xx_fec_tx_interrupt(priv->t_irq, dev);
enable_irq(priv->t_irq);
disable_irq(priv->r_irq);
mpc52xx_fec_rx_interrupt(priv->r_irq, dev);
enable_irq(priv->r_irq);
}
#endif
/* This handles BestComm transmit task interrupts
*/
static irqreturn_t mpc52xx_fec_tx_interrupt(int irq, void *dev_id)
{
struct net_device *dev = dev_id;
struct mpc52xx_fec_priv *priv = netdev_priv(dev);
unsigned long flags;
spin_lock_irqsave(&priv->lock, flags);
while (bcom_buffer_done(priv->tx_dmatsk)) {
struct sk_buff *skb;
struct bcom_fec_bd *bd;
skb = bcom_retrieve_buffer(priv->tx_dmatsk, NULL,
(struct bcom_bd **)&bd);
dma_unmap_single(dev->dev.parent, bd->skb_pa, skb->len,
DMA_TO_DEVICE);
dev_kfree_skb_irq(skb);
}
spin_unlock_irqrestore(&priv->lock, flags);
netif_wake_queue(dev);
return IRQ_HANDLED;
}
static irqreturn_t mpc52xx_fec_rx_interrupt(int irq, void *dev_id)
{
struct net_device *dev = dev_id;
struct mpc52xx_fec_priv *priv = netdev_priv(dev);
struct sk_buff *rskb; /* received sk_buff */
struct sk_buff *skb; /* new sk_buff to enqueue in its place */
struct bcom_fec_bd *bd;
u32 status, physaddr;
int length;
unsigned long flags;
spin_lock_irqsave(&priv->lock, flags);
while (bcom_buffer_done(priv->rx_dmatsk)) {
rskb = bcom_retrieve_buffer(priv->rx_dmatsk, &status,
(struct bcom_bd **)&bd);
physaddr = bd->skb_pa;
/* Test for errors in received frame */
if (status & BCOM_FEC_RX_BD_ERRORS) {
/* Drop packet and reuse the buffer */
mpc52xx_fec_rx_submit(dev, rskb);
dev->stats.rx_dropped++;
continue;
}
/* skbs are allocated on open, so now we allocate a new one,
* and remove the old (with the packet) */
skb = dev_alloc_skb(FEC_RX_BUFFER_SIZE);
if (!skb) {
/* Can't get a new one : reuse the same & drop pkt */
dev_notice(&dev->dev, "Low memory - dropped packet.\n");
mpc52xx_fec_rx_submit(dev, rskb);
dev->stats.rx_dropped++;
continue;
}
/* Enqueue the new sk_buff back on the hardware */
mpc52xx_fec_rx_submit(dev, skb);
/* Process the received skb - Drop the spin lock while
* calling into the network stack */
spin_unlock_irqrestore(&priv->lock, flags);
dma_unmap_single(dev->dev.parent, physaddr, rskb->len,
DMA_FROM_DEVICE);
length = status & BCOM_FEC_RX_BD_LEN_MASK;
skb_put(rskb, length - 4); /* length without CRC32 */
rskb->dev = dev;
rskb->protocol = eth_type_trans(rskb, dev);
netif_rx(rskb);
spin_lock_irqsave(&priv->lock, flags);
}
spin_unlock_irqrestore(&priv->lock, flags);
return IRQ_HANDLED;
}
static irqreturn_t mpc52xx_fec_interrupt(int irq, void *dev_id)
{
struct net_device *dev = dev_id;
struct mpc52xx_fec_priv *priv = netdev_priv(dev);
struct mpc52xx_fec __iomem *fec = priv->fec;
u32 ievent;
unsigned long flags;
ievent = in_be32(&fec->ievent);
ievent &= ~FEC_IEVENT_MII; /* mii is handled separately */
if (!ievent)
return IRQ_NONE;
out_be32(&fec->ievent, ievent); /* clear pending events */
/* on fifo error, soft-reset fec */
if (ievent & (FEC_IEVENT_RFIFO_ERROR | FEC_IEVENT_XFIFO_ERROR)) {
if (net_ratelimit() && (ievent & FEC_IEVENT_RFIFO_ERROR))
dev_warn(&dev->dev, "FEC_IEVENT_RFIFO_ERROR\n");
if (net_ratelimit() && (ievent & FEC_IEVENT_XFIFO_ERROR))
dev_warn(&dev->dev, "FEC_IEVENT_XFIFO_ERROR\n");
spin_lock_irqsave(&priv->lock, flags);
mpc52xx_fec_reset(dev);
spin_unlock_irqrestore(&priv->lock, flags);
return IRQ_HANDLED;
}
if (ievent & ~FEC_IEVENT_TFINT)
dev_dbg(&dev->dev, "ievent: %08x\n", ievent);
return IRQ_HANDLED;
}
/*
* Get the current statistics.
* This may be called with the card open or closed.
*/
static struct net_device_stats *mpc52xx_fec_get_stats(struct net_device *dev)
{
struct mpc52xx_fec_priv *priv = netdev_priv(dev);
struct net_device_stats *stats = &dev->stats;
struct mpc52xx_fec __iomem *fec = priv->fec;
stats->rx_bytes = in_be32(&fec->rmon_r_octets);
stats->rx_packets = in_be32(&fec->rmon_r_packets);
stats->rx_errors = in_be32(&fec->rmon_r_crc_align) +
in_be32(&fec->rmon_r_undersize) +
in_be32(&fec->rmon_r_oversize) +
in_be32(&fec->rmon_r_frag) +
in_be32(&fec->rmon_r_jab);
stats->tx_bytes = in_be32(&fec->rmon_t_octets);
stats->tx_packets = in_be32(&fec->rmon_t_packets);
stats->tx_errors = in_be32(&fec->rmon_t_crc_align) +
in_be32(&fec->rmon_t_undersize) +
in_be32(&fec->rmon_t_oversize) +
in_be32(&fec->rmon_t_frag) +
in_be32(&fec->rmon_t_jab);
stats->multicast = in_be32(&fec->rmon_r_mc_pkt);
stats->collisions = in_be32(&fec->rmon_t_col);
/* detailed rx_errors: */
stats->rx_length_errors = in_be32(&fec->rmon_r_undersize)
+ in_be32(&fec->rmon_r_oversize)
+ in_be32(&fec->rmon_r_frag)
+ in_be32(&fec->rmon_r_jab);
stats->rx_over_errors = in_be32(&fec->r_macerr);
stats->rx_crc_errors = in_be32(&fec->ieee_r_crc);
stats->rx_frame_errors = in_be32(&fec->ieee_r_align);
stats->rx_fifo_errors = in_be32(&fec->rmon_r_drop);
stats->rx_missed_errors = in_be32(&fec->rmon_r_drop);
/* detailed tx_errors: */
stats->tx_aborted_errors = 0;
stats->tx_carrier_errors = in_be32(&fec->ieee_t_cserr);
stats->tx_fifo_errors = in_be32(&fec->rmon_t_drop);
stats->tx_heartbeat_errors = in_be32(&fec->ieee_t_sqe);
stats->tx_window_errors = in_be32(&fec->ieee_t_lcol);
return stats;
}
/*
* Read MIB counters in order to reset them,
* then zero all the stats fields in memory
*/
static void mpc52xx_fec_reset_stats(struct net_device *dev)
{
struct mpc52xx_fec_priv *priv = netdev_priv(dev);
struct mpc52xx_fec __iomem *fec = priv->fec;
out_be32(&fec->mib_control, FEC_MIB_DISABLE);
memset_io(&fec->rmon_t_drop, 0,
offsetof(struct mpc52xx_fec, reserved10) -
offsetof(struct mpc52xx_fec, rmon_t_drop));
out_be32(&fec->mib_control, 0);
memset(&dev->stats, 0, sizeof(dev->stats));
}
/*
* Set or clear the multicast filter for this adaptor.
*/
static void mpc52xx_fec_set_multicast_list(struct net_device *dev)
{
struct mpc52xx_fec_priv *priv = netdev_priv(dev);
struct mpc52xx_fec __iomem *fec = priv->fec;
u32 rx_control;
rx_control = in_be32(&fec->r_cntrl);
if (dev->flags & IFF_PROMISC) {
rx_control |= FEC_RCNTRL_PROM;
out_be32(&fec->r_cntrl, rx_control);
} else {
rx_control &= ~FEC_RCNTRL_PROM;
out_be32(&fec->r_cntrl, rx_control);
if (dev->flags & IFF_ALLMULTI) {
out_be32(&fec->gaddr1, 0xffffffff);
out_be32(&fec->gaddr2, 0xffffffff);
} else {
u32 crc;
int i;
struct dev_mc_list *dmi;
u32 gaddr1 = 0x00000000;
u32 gaddr2 = 0x00000000;
dmi = dev->mc_list;
for (i=0; i<dev->mc_count; i++) {
crc = ether_crc_le(6, dmi->dmi_addr) >> 26;
if (crc >= 32)
gaddr1 |= 1 << (crc-32);
else
gaddr2 |= 1 << crc;
dmi = dmi->next;
}
out_be32(&fec->gaddr1, gaddr1);
out_be32(&fec->gaddr2, gaddr2);
}
}
}
/**
* mpc52xx_fec_hw_init
* @dev: network device
*
* Setup various hardware setting, only needed once on start
*/
static void mpc52xx_fec_hw_init(struct net_device *dev)
{
struct mpc52xx_fec_priv *priv = netdev_priv(dev);
struct mpc52xx_fec __iomem *fec = priv->fec;
int i;
/* Whack a reset. We should wait for this. */
out_be32(&fec->ecntrl, FEC_ECNTRL_RESET);
for (i = 0; i < FEC_RESET_DELAY; ++i) {
if ((in_be32(&fec->ecntrl) & FEC_ECNTRL_RESET) == 0)
break;
udelay(1);
}
if (i == FEC_RESET_DELAY)
dev_err(&dev->dev, "FEC Reset timeout!\n");
/* set pause to 0x20 frames */
out_be32(&fec->op_pause, FEC_OP_PAUSE_OPCODE | 0x20);
/* high service request will be deasserted when there's < 7 bytes in fifo
* low service request will be deasserted when there's < 4*7 bytes in fifo
*/
out_be32(&fec->rfifo_cntrl, FEC_FIFO_CNTRL_FRAME | FEC_FIFO_CNTRL_LTG_7);
out_be32(&fec->tfifo_cntrl, FEC_FIFO_CNTRL_FRAME | FEC_FIFO_CNTRL_LTG_7);
/* alarm when <= x bytes in FIFO */
out_be32(&fec->rfifo_alarm, 0x0000030c);
out_be32(&fec->tfifo_alarm, 0x00000100);
/* begin transmittion when 256 bytes are in FIFO (or EOF or FIFO full) */
out_be32(&fec->x_wmrk, FEC_FIFO_WMRK_256B);
/* enable crc generation */
out_be32(&fec->xmit_fsm, FEC_XMIT_FSM_APPEND_CRC | FEC_XMIT_FSM_ENABLE_CRC);
out_be32(&fec->iaddr1, 0x00000000); /* No individual filter */
out_be32(&fec->iaddr2, 0x00000000); /* No individual filter */
/* set phy speed.
* this can't be done in phy driver, since it needs to be called
* before fec stuff (even on resume) */
out_be32(&fec->mii_speed, priv->mdio_speed);
}
/**
* mpc52xx_fec_start
* @dev: network device
*
* This function is called to start or restart the FEC during a link
* change. This happens on fifo errors or when switching between half
* and full duplex.
*/
static void mpc52xx_fec_start(struct net_device *dev)
{
struct mpc52xx_fec_priv *priv = netdev_priv(dev);
struct mpc52xx_fec __iomem *fec = priv->fec;
u32 rcntrl;
u32 tcntrl;
u32 tmp;
/* clear sticky error bits */
tmp = FEC_FIFO_STATUS_ERR | FEC_FIFO_STATUS_UF | FEC_FIFO_STATUS_OF;
out_be32(&fec->rfifo_status, in_be32(&fec->rfifo_status) & tmp);
out_be32(&fec->tfifo_status, in_be32(&fec->tfifo_status) & tmp);
/* FIFOs will reset on mpc52xx_fec_enable */
out_be32(&fec->reset_cntrl, FEC_RESET_CNTRL_ENABLE_IS_RESET);
/* Set station address. */
mpc52xx_fec_set_paddr(dev, dev->dev_addr);
mpc52xx_fec_set_multicast_list(dev);
/* set max frame len, enable flow control, select mii mode */
rcntrl = FEC_RX_BUFFER_SIZE << 16; /* max frame length */
rcntrl |= FEC_RCNTRL_FCE;
if (!priv->seven_wire_mode)
rcntrl |= FEC_RCNTRL_MII_MODE;
if (priv->duplex == DUPLEX_FULL)
tcntrl = FEC_TCNTRL_FDEN; /* FD enable */
else {
rcntrl |= FEC_RCNTRL_DRT; /* disable Rx on Tx (HD) */
tcntrl = 0;
}
out_be32(&fec->r_cntrl, rcntrl);
out_be32(&fec->x_cntrl, tcntrl);
/* Clear any outstanding interrupt. */
out_be32(&fec->ievent, 0xffffffff);
/* Enable interrupts we wish to service. */
out_be32(&fec->imask, FEC_IMASK_ENABLE);
/* And last, enable the transmit and receive processing. */
out_be32(&fec->ecntrl, FEC_ECNTRL_ETHER_EN);
out_be32(&fec->r_des_active, 0x01000000);
}
/**
* mpc52xx_fec_stop
* @dev: network device
*
* stop all activity on fec and empty dma buffers
*/
static void mpc52xx_fec_stop(struct net_device *dev)
{
struct mpc52xx_fec_priv *priv = netdev_priv(dev);
struct mpc52xx_fec __iomem *fec = priv->fec;
unsigned long timeout;
/* disable all interrupts */
out_be32(&fec->imask, 0);
/* Disable the rx task. */
bcom_disable(priv->rx_dmatsk);
/* Wait for tx queue to drain, but only if we're in process context */
if (!in_interrupt()) {
timeout = jiffies + msecs_to_jiffies(2000);
while (time_before(jiffies, timeout) &&
!bcom_queue_empty(priv->tx_dmatsk))
msleep(100);
if (time_after_eq(jiffies, timeout))
dev_err(&dev->dev, "queues didn't drain\n");
#if 1
if (time_after_eq(jiffies, timeout)) {
dev_err(&dev->dev, " tx: index: %i, outdex: %i\n",
priv->tx_dmatsk->index,
priv->tx_dmatsk->outdex);
dev_err(&dev->dev, " rx: index: %i, outdex: %i\n",
priv->rx_dmatsk->index,
priv->rx_dmatsk->outdex);
}
#endif
}
bcom_disable(priv->tx_dmatsk);
/* Stop FEC */
out_be32(&fec->ecntrl, in_be32(&fec->ecntrl) & ~FEC_ECNTRL_ETHER_EN);
}
/* reset fec and bestcomm tasks */
static void mpc52xx_fec_reset(struct net_device *dev)
{
struct mpc52xx_fec_priv *priv = netdev_priv(dev);
struct mpc52xx_fec __iomem *fec = priv->fec;
mpc52xx_fec_stop(dev);
out_be32(&fec->rfifo_status, in_be32(&fec->rfifo_status));
out_be32(&fec->reset_cntrl, FEC_RESET_CNTRL_RESET_FIFO);
mpc52xx_fec_free_rx_buffers(dev, priv->rx_dmatsk);
mpc52xx_fec_hw_init(dev);
bcom_fec_rx_reset(priv->rx_dmatsk);
bcom_fec_tx_reset(priv->tx_dmatsk);
mpc52xx_fec_alloc_rx_buffers(dev, priv->rx_dmatsk);
bcom_enable(priv->rx_dmatsk);
bcom_enable(priv->tx_dmatsk);
mpc52xx_fec_start(dev);
netif_wake_queue(dev);
}
/* ethtool interface */
static void mpc52xx_fec_get_drvinfo(struct net_device *dev,
struct ethtool_drvinfo *info)
{
strcpy(info->driver, DRIVER_NAME);
}
static int mpc52xx_fec_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
struct mpc52xx_fec_priv *priv = netdev_priv(dev);
if (!priv->phydev)
return -ENODEV;
return phy_ethtool_gset(priv->phydev, cmd);
}
static int mpc52xx_fec_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
struct mpc52xx_fec_priv *priv = netdev_priv(dev);
if (!priv->phydev)
return -ENODEV;
return phy_ethtool_sset(priv->phydev, cmd);
}
static u32 mpc52xx_fec_get_msglevel(struct net_device *dev)
{
struct mpc52xx_fec_priv *priv = netdev_priv(dev);
return priv->msg_enable;
}
static void mpc52xx_fec_set_msglevel(struct net_device *dev, u32 level)
{
struct mpc52xx_fec_priv *priv = netdev_priv(dev);
priv->msg_enable = level;
}
static const struct ethtool_ops mpc52xx_fec_ethtool_ops = {
.get_drvinfo = mpc52xx_fec_get_drvinfo,
.get_settings = mpc52xx_fec_get_settings,
.set_settings = mpc52xx_fec_set_settings,
.get_link = ethtool_op_get_link,
.get_msglevel = mpc52xx_fec_get_msglevel,
.set_msglevel = mpc52xx_fec_set_msglevel,
};
static int mpc52xx_fec_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
struct mpc52xx_fec_priv *priv = netdev_priv(dev);
if (!priv->phydev)
return -ENOTSUPP;
return phy_mii_ioctl(priv->phydev, if_mii(rq), cmd);
}
static const struct net_device_ops mpc52xx_fec_netdev_ops = {
.ndo_open = mpc52xx_fec_open,
.ndo_stop = mpc52xx_fec_close,
.ndo_start_xmit = mpc52xx_fec_start_xmit,
.ndo_set_multicast_list = mpc52xx_fec_set_multicast_list,
.ndo_set_mac_address = mpc52xx_fec_set_mac_address,
.ndo_validate_addr = eth_validate_addr,
.ndo_do_ioctl = mpc52xx_fec_ioctl,
.ndo_change_mtu = eth_change_mtu,
.ndo_tx_timeout = mpc52xx_fec_tx_timeout,
.ndo_get_stats = mpc52xx_fec_get_stats,
#ifdef CONFIG_NET_POLL_CONTROLLER
.ndo_poll_controller = mpc52xx_fec_poll_controller,
#endif
};
/* ======================================================================== */
/* OF Driver */
/* ======================================================================== */
static int __devinit
mpc52xx_fec_probe(struct of_device *op, const struct of_device_id *match)
{
int rv;
struct net_device *ndev;
struct mpc52xx_fec_priv *priv = NULL;
struct resource mem;
const u32 *prop;
int prop_size;
phys_addr_t rx_fifo;
phys_addr_t tx_fifo;
/* Get the ether ndev & it's private zone */
ndev = alloc_etherdev(sizeof(struct mpc52xx_fec_priv));
if (!ndev)
return -ENOMEM;
priv = netdev_priv(ndev);
priv->ndev = ndev;
/* Reserve FEC control zone */
rv = of_address_to_resource(op->node, 0, &mem);
if (rv) {
printk(KERN_ERR DRIVER_NAME ": "
"Error while parsing device node resource\n" );
return rv;
}
if ((mem.end - mem.start + 1) < sizeof(struct mpc52xx_fec)) {
printk(KERN_ERR DRIVER_NAME
" - invalid resource size (%lx < %x), check mpc52xx_devices.c\n",
(unsigned long)(mem.end - mem.start + 1), sizeof(struct mpc52xx_fec));
return -EINVAL;
}
if (!request_mem_region(mem.start, sizeof(struct mpc52xx_fec), DRIVER_NAME))
return -EBUSY;
/* Init ether ndev with what we have */
ndev->netdev_ops = &mpc52xx_fec_netdev_ops;
ndev->ethtool_ops = &mpc52xx_fec_ethtool_ops;
ndev->watchdog_timeo = FEC_WATCHDOG_TIMEOUT;
ndev->base_addr = mem.start;
SET_NETDEV_DEV(ndev, &op->dev);
spin_lock_init(&priv->lock);
/* ioremap the zones */
priv->fec = ioremap(mem.start, sizeof(struct mpc52xx_fec));
if (!priv->fec) {
rv = -ENOMEM;
goto probe_error;
}
/* Bestcomm init */
rx_fifo = ndev->base_addr + offsetof(struct mpc52xx_fec, rfifo_data);
tx_fifo = ndev->base_addr + offsetof(struct mpc52xx_fec, tfifo_data);
priv->rx_dmatsk = bcom_fec_rx_init(FEC_RX_NUM_BD, rx_fifo, FEC_RX_BUFFER_SIZE);
priv->tx_dmatsk = bcom_fec_tx_init(FEC_TX_NUM_BD, tx_fifo);
if (!priv->rx_dmatsk || !priv->tx_dmatsk) {
printk(KERN_ERR DRIVER_NAME ": Can not init SDMA tasks\n" );
rv = -ENOMEM;
goto probe_error;
}
/* Get the IRQ we need one by one */
/* Control */
ndev->irq = irq_of_parse_and_map(op->node, 0);
/* RX */
priv->r_irq = bcom_get_task_irq(priv->rx_dmatsk);
/* TX */
priv->t_irq = bcom_get_task_irq(priv->tx_dmatsk);
/* MAC address init */
if (!is_zero_ether_addr(mpc52xx_fec_mac_addr))
memcpy(ndev->dev_addr, mpc52xx_fec_mac_addr, 6);
else
mpc52xx_fec_get_paddr(ndev, ndev->dev_addr);
priv->msg_enable = netif_msg_init(debug, MPC52xx_MESSAGES_DEFAULT);
/*
* Link mode configuration
*/
/* Start with safe defaults for link connection */
priv->speed = 100;
priv->duplex = DUPLEX_HALF;
priv->mdio_speed = ((mpc5xxx_get_bus_frequency(op->node) >> 20) / 5) << 1;
/* The current speed preconfigures the speed of the MII link */
prop = of_get_property(op->node, "current-speed", &prop_size);
if (prop && (prop_size >= sizeof(u32) * 2)) {
priv->speed = prop[0];
priv->duplex = prop[1] ? DUPLEX_FULL : DUPLEX_HALF;
}
/* If there is a phy handle, then get the PHY node */
priv->phy_node = of_parse_phandle(op->node, "phy-handle", 0);
/* the 7-wire property means don't use MII mode */
if (of_find_property(op->node, "fsl,7-wire-mode", NULL)) {
priv->seven_wire_mode = 1;
dev_info(&ndev->dev, "using 7-wire PHY mode\n");
}
/* Hardware init */
mpc52xx_fec_hw_init(ndev);
mpc52xx_fec_reset_stats(ndev);
rv = register_netdev(ndev);
if (rv < 0)
goto probe_error;
/* We're done ! */
dev_set_drvdata(&op->dev, ndev);
return 0;
/* Error handling - free everything that might be allocated */
probe_error:
if (priv->phy_node)
of_node_put(priv->phy_node);
priv->phy_node = NULL;
irq_dispose_mapping(ndev->irq);
if (priv->rx_dmatsk)
bcom_fec_rx_release(priv->rx_dmatsk);
if (priv->tx_dmatsk)
bcom_fec_tx_release(priv->tx_dmatsk);
if (priv->fec)
iounmap(priv->fec);
release_mem_region(mem.start, sizeof(struct mpc52xx_fec));
free_netdev(ndev);
return rv;
}
static int
mpc52xx_fec_remove(struct of_device *op)
{
struct net_device *ndev;
struct mpc52xx_fec_priv *priv;
ndev = dev_get_drvdata(&op->dev);
priv = netdev_priv(ndev);
unregister_netdev(ndev);
if (priv->phy_node)
of_node_put(priv->phy_node);
priv->phy_node = NULL;
irq_dispose_mapping(ndev->irq);
bcom_fec_rx_release(priv->rx_dmatsk);
bcom_fec_tx_release(priv->tx_dmatsk);
iounmap(priv->fec);
release_mem_region(ndev->base_addr, sizeof(struct mpc52xx_fec));
free_netdev(ndev);
dev_set_drvdata(&op->dev, NULL);
return 0;
}
#ifdef CONFIG_PM
static int mpc52xx_fec_of_suspend(struct of_device *op, pm_message_t state)
{
struct net_device *dev = dev_get_drvdata(&op->dev);
if (netif_running(dev))
mpc52xx_fec_close(dev);
return 0;
}
static int mpc52xx_fec_of_resume(struct of_device *op)
{
struct net_device *dev = dev_get_drvdata(&op->dev);
mpc52xx_fec_hw_init(dev);
mpc52xx_fec_reset_stats(dev);
if (netif_running(dev))
mpc52xx_fec_open(dev);
return 0;
}
#endif
static struct of_device_id mpc52xx_fec_match[] = {
{ .compatible = "fsl,mpc5200b-fec", },
{ .compatible = "fsl,mpc5200-fec", },
{ .compatible = "mpc5200-fec", },
{ }
};
MODULE_DEVICE_TABLE(of, mpc52xx_fec_match);
static struct of_platform_driver mpc52xx_fec_driver = {
.owner = THIS_MODULE,
.name = DRIVER_NAME,
.match_table = mpc52xx_fec_match,
.probe = mpc52xx_fec_probe,
.remove = mpc52xx_fec_remove,
#ifdef CONFIG_PM
.suspend = mpc52xx_fec_of_suspend,
.resume = mpc52xx_fec_of_resume,
#endif
};
/* ======================================================================== */
/* Module */
/* ======================================================================== */
static int __init
mpc52xx_fec_init(void)
{
#ifdef CONFIG_FEC_MPC52xx_MDIO
int ret;
ret = of_register_platform_driver(&mpc52xx_fec_mdio_driver);
if (ret) {
printk(KERN_ERR DRIVER_NAME ": failed to register mdio driver\n");
return ret;
}
#endif
return of_register_platform_driver(&mpc52xx_fec_driver);
}
static void __exit
mpc52xx_fec_exit(void)
{
of_unregister_platform_driver(&mpc52xx_fec_driver);
#ifdef CONFIG_FEC_MPC52xx_MDIO
of_unregister_platform_driver(&mpc52xx_fec_mdio_driver);
#endif
}
module_init(mpc52xx_fec_init);
module_exit(mpc52xx_fec_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Dale Farnsworth");
MODULE_DESCRIPTION("Ethernet driver for the Freescale MPC52xx FEC");
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