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linux_dsm_epyc7002/drivers/net/fec.c
Bryan Wu 418bd0d4df netdev/fec: fix ifconfig eth0 down hang issue 
BugLink: http://bugs.launchpad.net/bugs/559065

In fec open/close function, we need to use phy_connect and phy_disconnect
operation before we start/stop phy. Otherwise it will cause system hang.

Only call fec_enet_mii_probe() in open function, because the first open
action will cause NULL pointer error.

Signed-off-by: Bryan Wu <bryan.wu@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2010-05-28 03:40:39 -07:00

1427 lines
36 KiB
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/*
* Fast Ethernet Controller (FEC) driver for Motorola MPC8xx.
* Copyright (c) 1997 Dan Malek (dmalek@jlc.net)
*
* Right now, I am very wasteful with the buffers. I allocate memory
* pages and then divide them into 2K frame buffers. This way I know I
* have buffers large enough to hold one frame within one buffer descriptor.
* Once I get this working, I will use 64 or 128 byte CPM buffers, which
* will be much more memory efficient and will easily handle lots of
* small packets.
*
* Much better multiple PHY support by Magnus Damm.
* Copyright (c) 2000 Ericsson Radio Systems AB.
*
* Support for FEC controller of ColdFire processors.
* Copyright (c) 2001-2005 Greg Ungerer (gerg@snapgear.com)
*
* Bug fixes and cleanup by Philippe De Muyter (phdm@macqel.be)
* Copyright (c) 2004-2006 Macq Electronique SA.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/ptrace.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/workqueue.h>
#include <linux/bitops.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/clk.h>
#include <linux/platform_device.h>
#include <linux/phy.h>
#include <linux/fec.h>
#include <asm/cacheflush.h>
#ifndef CONFIG_ARCH_MXC
#include <asm/coldfire.h>
#include <asm/mcfsim.h>
#endif
#include "fec.h"
#ifdef CONFIG_ARCH_MXC
#include <mach/hardware.h>
#define FEC_ALIGNMENT 0xf
#else
#define FEC_ALIGNMENT 0x3
#endif
/*
* Define the fixed address of the FEC hardware.
*/
#if defined(CONFIG_M5272)
static unsigned char fec_mac_default[] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
};
/*
* Some hardware gets it MAC address out of local flash memory.
* if this is non-zero then assume it is the address to get MAC from.
*/
#if defined(CONFIG_NETtel)
#define FEC_FLASHMAC 0xf0006006
#elif defined(CONFIG_GILBARCONAP) || defined(CONFIG_SCALES)
#define FEC_FLASHMAC 0xf0006000
#elif defined(CONFIG_CANCam)
#define FEC_FLASHMAC 0xf0020000
#elif defined (CONFIG_M5272C3)
#define FEC_FLASHMAC (0xffe04000 + 4)
#elif defined(CONFIG_MOD5272)
#define FEC_FLASHMAC 0xffc0406b
#else
#define FEC_FLASHMAC 0
#endif
#endif /* CONFIG_M5272 */
/* The number of Tx and Rx buffers. These are allocated from the page
* pool. The code may assume these are power of two, so it it best
* to keep them that size.
* We don't need to allocate pages for the transmitter. We just use
* the skbuffer directly.
*/
#define FEC_ENET_RX_PAGES 8
#define FEC_ENET_RX_FRSIZE 2048
#define FEC_ENET_RX_FRPPG (PAGE_SIZE / FEC_ENET_RX_FRSIZE)
#define RX_RING_SIZE (FEC_ENET_RX_FRPPG * FEC_ENET_RX_PAGES)
#define FEC_ENET_TX_FRSIZE 2048
#define FEC_ENET_TX_FRPPG (PAGE_SIZE / FEC_ENET_TX_FRSIZE)
#define TX_RING_SIZE 16 /* Must be power of two */
#define TX_RING_MOD_MASK 15 /* for this to work */
#if (((RX_RING_SIZE + TX_RING_SIZE) * 8) > PAGE_SIZE)
#error "FEC: descriptor ring size constants too large"
#endif
/* Interrupt events/masks. */
#define FEC_ENET_HBERR ((uint)0x80000000) /* Heartbeat error */
#define FEC_ENET_BABR ((uint)0x40000000) /* Babbling receiver */
#define FEC_ENET_BABT ((uint)0x20000000) /* Babbling transmitter */
#define FEC_ENET_GRA ((uint)0x10000000) /* Graceful stop complete */
#define FEC_ENET_TXF ((uint)0x08000000) /* Full frame transmitted */
#define FEC_ENET_TXB ((uint)0x04000000) /* A buffer was transmitted */
#define FEC_ENET_RXF ((uint)0x02000000) /* Full frame received */
#define FEC_ENET_RXB ((uint)0x01000000) /* A buffer was received */
#define FEC_ENET_MII ((uint)0x00800000) /* MII interrupt */
#define FEC_ENET_EBERR ((uint)0x00400000) /* SDMA bus error */
/* The FEC stores dest/src/type, data, and checksum for receive packets.
*/
#define PKT_MAXBUF_SIZE 1518
#define PKT_MINBUF_SIZE 64
#define PKT_MAXBLR_SIZE 1520
/*
* The 5270/5271/5280/5282/532x RX control register also contains maximum frame
* size bits. Other FEC hardware does not, so we need to take that into
* account when setting it.
*/
#if defined(CONFIG_M523x) || defined(CONFIG_M527x) || defined(CONFIG_M528x) || \
defined(CONFIG_M520x) || defined(CONFIG_M532x) || defined(CONFIG_ARCH_MXC)
#define OPT_FRAME_SIZE (PKT_MAXBUF_SIZE << 16)
#else
#define OPT_FRAME_SIZE 0
#endif
/* The FEC buffer descriptors track the ring buffers. The rx_bd_base and
* tx_bd_base always point to the base of the buffer descriptors. The
* cur_rx and cur_tx point to the currently available buffer.
* The dirty_tx tracks the current buffer that is being sent by the
* controller. The cur_tx and dirty_tx are equal under both completely
* empty and completely full conditions. The empty/ready indicator in
* the buffer descriptor determines the actual condition.
*/
struct fec_enet_private {
/* Hardware registers of the FEC device */
void __iomem *hwp;
struct net_device *netdev;
struct clk *clk;
/* The saved address of a sent-in-place packet/buffer, for skfree(). */
unsigned char *tx_bounce[TX_RING_SIZE];
struct sk_buff* tx_skbuff[TX_RING_SIZE];
struct sk_buff* rx_skbuff[RX_RING_SIZE];
ushort skb_cur;
ushort skb_dirty;
/* CPM dual port RAM relative addresses */
dma_addr_t bd_dma;
/* Address of Rx and Tx buffers */
struct bufdesc *rx_bd_base;
struct bufdesc *tx_bd_base;
/* The next free ring entry */
struct bufdesc *cur_rx, *cur_tx;
/* The ring entries to be free()ed */
struct bufdesc *dirty_tx;
uint tx_full;
/* hold while accessing the HW like ringbuffer for tx/rx but not MAC */
spinlock_t hw_lock;
struct platform_device *pdev;
int opened;
/* Phylib and MDIO interface */
struct mii_bus *mii_bus;
struct phy_device *phy_dev;
int mii_timeout;
uint phy_speed;
phy_interface_t phy_interface;
int index;
int link;
int full_duplex;
};
static irqreturn_t fec_enet_interrupt(int irq, void * dev_id);
static void fec_enet_tx(struct net_device *dev);
static void fec_enet_rx(struct net_device *dev);
static int fec_enet_close(struct net_device *dev);
static void fec_restart(struct net_device *dev, int duplex);
static void fec_stop(struct net_device *dev);
/* FEC MII MMFR bits definition */
#define FEC_MMFR_ST (1 << 30)
#define FEC_MMFR_OP_READ (2 << 28)
#define FEC_MMFR_OP_WRITE (1 << 28)
#define FEC_MMFR_PA(v) ((v & 0x1f) << 23)
#define FEC_MMFR_RA(v) ((v & 0x1f) << 18)
#define FEC_MMFR_TA (2 << 16)
#define FEC_MMFR_DATA(v) (v & 0xffff)
#define FEC_MII_TIMEOUT 10000
/* Transmitter timeout */
#define TX_TIMEOUT (2 * HZ)
static int
fec_enet_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct fec_enet_private *fep = netdev_priv(dev);
struct bufdesc *bdp;
void *bufaddr;
unsigned short status;
unsigned long flags;
if (!fep->link) {
/* Link is down or autonegotiation is in progress. */
return NETDEV_TX_BUSY;
}
spin_lock_irqsave(&fep->hw_lock, flags);
/* Fill in a Tx ring entry */
bdp = fep->cur_tx;
status = bdp->cbd_sc;
if (status & BD_ENET_TX_READY) {
/* Ooops. All transmit buffers are full. Bail out.
* This should not happen, since dev->tbusy should be set.
*/
printk("%s: tx queue full!.\n", dev->name);
spin_unlock_irqrestore(&fep->hw_lock, flags);
return NETDEV_TX_BUSY;
}
/* Clear all of the status flags */
status &= ~BD_ENET_TX_STATS;
/* Set buffer length and buffer pointer */
bufaddr = skb->data;
bdp->cbd_datlen = skb->len;
/*
* On some FEC implementations data must be aligned on
* 4-byte boundaries. Use bounce buffers to copy data
* and get it aligned. Ugh.
*/
if (((unsigned long) bufaddr) & FEC_ALIGNMENT) {
unsigned int index;
index = bdp - fep->tx_bd_base;
memcpy(fep->tx_bounce[index], (void *)skb->data, skb->len);
bufaddr = fep->tx_bounce[index];
}
/* Save skb pointer */
fep->tx_skbuff[fep->skb_cur] = skb;
dev->stats.tx_bytes += skb->len;
fep->skb_cur = (fep->skb_cur+1) & TX_RING_MOD_MASK;
/* Push the data cache so the CPM does not get stale memory
* data.
*/
bdp->cbd_bufaddr = dma_map_single(&dev->dev, bufaddr,
FEC_ENET_TX_FRSIZE, DMA_TO_DEVICE);
/* Send it on its way. Tell FEC it's ready, interrupt when done,
* it's the last BD of the frame, and to put the CRC on the end.
*/
status |= (BD_ENET_TX_READY | BD_ENET_TX_INTR
| BD_ENET_TX_LAST | BD_ENET_TX_TC);
bdp->cbd_sc = status;
/* Trigger transmission start */
writel(0, fep->hwp + FEC_X_DES_ACTIVE);
/* If this was the last BD in the ring, start at the beginning again. */
if (status & BD_ENET_TX_WRAP)
bdp = fep->tx_bd_base;
else
bdp++;
if (bdp == fep->dirty_tx) {
fep->tx_full = 1;
netif_stop_queue(dev);
}
fep->cur_tx = bdp;
spin_unlock_irqrestore(&fep->hw_lock, flags);
return NETDEV_TX_OK;
}
static void
fec_timeout(struct net_device *dev)
{
struct fec_enet_private *fep = netdev_priv(dev);
dev->stats.tx_errors++;
fec_restart(dev, fep->full_duplex);
netif_wake_queue(dev);
}
static irqreturn_t
fec_enet_interrupt(int irq, void * dev_id)
{
struct net_device *dev = dev_id;
struct fec_enet_private *fep = netdev_priv(dev);
uint int_events;
irqreturn_t ret = IRQ_NONE;
do {
int_events = readl(fep->hwp + FEC_IEVENT);
writel(int_events, fep->hwp + FEC_IEVENT);
if (int_events & FEC_ENET_RXF) {
ret = IRQ_HANDLED;
fec_enet_rx(dev);
}
/* Transmit OK, or non-fatal error. Update the buffer
* descriptors. FEC handles all errors, we just discover
* them as part of the transmit process.
*/
if (int_events & FEC_ENET_TXF) {
ret = IRQ_HANDLED;
fec_enet_tx(dev);
}
} while (int_events);
return ret;
}
static void
fec_enet_tx(struct net_device *dev)
{
struct fec_enet_private *fep;
struct bufdesc *bdp;
unsigned short status;
struct sk_buff *skb;
fep = netdev_priv(dev);
spin_lock(&fep->hw_lock);
bdp = fep->dirty_tx;
while (((status = bdp->cbd_sc) & BD_ENET_TX_READY) == 0) {
if (bdp == fep->cur_tx && fep->tx_full == 0)
break;
dma_unmap_single(&dev->dev, bdp->cbd_bufaddr, FEC_ENET_TX_FRSIZE, DMA_TO_DEVICE);
bdp->cbd_bufaddr = 0;
skb = fep->tx_skbuff[fep->skb_dirty];
/* Check for errors. */
if (status & (BD_ENET_TX_HB | BD_ENET_TX_LC |
BD_ENET_TX_RL | BD_ENET_TX_UN |
BD_ENET_TX_CSL)) {
dev->stats.tx_errors++;
if (status & BD_ENET_TX_HB) /* No heartbeat */
dev->stats.tx_heartbeat_errors++;
if (status & BD_ENET_TX_LC) /* Late collision */
dev->stats.tx_window_errors++;
if (status & BD_ENET_TX_RL) /* Retrans limit */
dev->stats.tx_aborted_errors++;
if (status & BD_ENET_TX_UN) /* Underrun */
dev->stats.tx_fifo_errors++;
if (status & BD_ENET_TX_CSL) /* Carrier lost */
dev->stats.tx_carrier_errors++;
} else {
dev->stats.tx_packets++;
}
if (status & BD_ENET_TX_READY)
printk("HEY! Enet xmit interrupt and TX_READY.\n");
/* Deferred means some collisions occurred during transmit,
* but we eventually sent the packet OK.
*/
if (status & BD_ENET_TX_DEF)
dev->stats.collisions++;
/* Free the sk buffer associated with this last transmit */
dev_kfree_skb_any(skb);
fep->tx_skbuff[fep->skb_dirty] = NULL;
fep->skb_dirty = (fep->skb_dirty + 1) & TX_RING_MOD_MASK;
/* Update pointer to next buffer descriptor to be transmitted */
if (status & BD_ENET_TX_WRAP)
bdp = fep->tx_bd_base;
else
bdp++;
/* Since we have freed up a buffer, the ring is no longer full
*/
if (fep->tx_full) {
fep->tx_full = 0;
if (netif_queue_stopped(dev))
netif_wake_queue(dev);
}
}
fep->dirty_tx = bdp;
spin_unlock(&fep->hw_lock);
}
/* During a receive, the cur_rx points to the current incoming buffer.
* When we update through the ring, if the next incoming buffer has
* not been given to the system, we just set the empty indicator,
* effectively tossing the packet.
*/
static void
fec_enet_rx(struct net_device *dev)
{
struct fec_enet_private *fep = netdev_priv(dev);
struct bufdesc *bdp;
unsigned short status;
struct sk_buff *skb;
ushort pkt_len;
__u8 *data;
#ifdef CONFIG_M532x
flush_cache_all();
#endif
spin_lock(&fep->hw_lock);
/* First, grab all of the stats for the incoming packet.
* These get messed up if we get called due to a busy condition.
*/
bdp = fep->cur_rx;
while (!((status = bdp->cbd_sc) & BD_ENET_RX_EMPTY)) {
/* Since we have allocated space to hold a complete frame,
* the last indicator should be set.
*/
if ((status & BD_ENET_RX_LAST) == 0)
printk("FEC ENET: rcv is not +last\n");
if (!fep->opened)
goto rx_processing_done;
/* Check for errors. */
if (status & (BD_ENET_RX_LG | BD_ENET_RX_SH | BD_ENET_RX_NO |
BD_ENET_RX_CR | BD_ENET_RX_OV)) {
dev->stats.rx_errors++;
if (status & (BD_ENET_RX_LG | BD_ENET_RX_SH)) {
/* Frame too long or too short. */
dev->stats.rx_length_errors++;
}
if (status & BD_ENET_RX_NO) /* Frame alignment */
dev->stats.rx_frame_errors++;
if (status & BD_ENET_RX_CR) /* CRC Error */
dev->stats.rx_crc_errors++;
if (status & BD_ENET_RX_OV) /* FIFO overrun */
dev->stats.rx_fifo_errors++;
}
/* Report late collisions as a frame error.
* On this error, the BD is closed, but we don't know what we
* have in the buffer. So, just drop this frame on the floor.
*/
if (status & BD_ENET_RX_CL) {
dev->stats.rx_errors++;
dev->stats.rx_frame_errors++;
goto rx_processing_done;
}
/* Process the incoming frame. */
dev->stats.rx_packets++;
pkt_len = bdp->cbd_datlen;
dev->stats.rx_bytes += pkt_len;
data = (__u8*)__va(bdp->cbd_bufaddr);
dma_unmap_single(NULL, bdp->cbd_bufaddr, bdp->cbd_datlen,
DMA_FROM_DEVICE);
/* This does 16 byte alignment, exactly what we need.
* The packet length includes FCS, but we don't want to
* include that when passing upstream as it messes up
* bridging applications.
*/
skb = dev_alloc_skb(pkt_len - 4 + NET_IP_ALIGN);
if (unlikely(!skb)) {
printk("%s: Memory squeeze, dropping packet.\n",
dev->name);
dev->stats.rx_dropped++;
} else {
skb_reserve(skb, NET_IP_ALIGN);
skb_put(skb, pkt_len - 4); /* Make room */
skb_copy_to_linear_data(skb, data, pkt_len - 4);
skb->protocol = eth_type_trans(skb, dev);
netif_rx(skb);
}
bdp->cbd_bufaddr = dma_map_single(NULL, data, bdp->cbd_datlen,
DMA_FROM_DEVICE);
rx_processing_done:
/* Clear the status flags for this buffer */
status &= ~BD_ENET_RX_STATS;
/* Mark the buffer empty */
status |= BD_ENET_RX_EMPTY;
bdp->cbd_sc = status;
/* Update BD pointer to next entry */
if (status & BD_ENET_RX_WRAP)
bdp = fep->rx_bd_base;
else
bdp++;
/* Doing this here will keep the FEC running while we process
* incoming frames. On a heavily loaded network, we should be
* able to keep up at the expense of system resources.
*/
writel(0, fep->hwp + FEC_R_DES_ACTIVE);
}
fep->cur_rx = bdp;
spin_unlock(&fep->hw_lock);
}
/* ------------------------------------------------------------------------- */
#ifdef CONFIG_M5272
static void __inline__ fec_get_mac(struct net_device *dev)
{
struct fec_enet_private *fep = netdev_priv(dev);
unsigned char *iap, tmpaddr[ETH_ALEN];
if (FEC_FLASHMAC) {
/*
* Get MAC address from FLASH.
* If it is all 1's or 0's, use the default.
*/
iap = (unsigned char *)FEC_FLASHMAC;
if ((iap[0] == 0) && (iap[1] == 0) && (iap[2] == 0) &&
(iap[3] == 0) && (iap[4] == 0) && (iap[5] == 0))
iap = fec_mac_default;
if ((iap[0] == 0xff) && (iap[1] == 0xff) && (iap[2] == 0xff) &&
(iap[3] == 0xff) && (iap[4] == 0xff) && (iap[5] == 0xff))
iap = fec_mac_default;
} else {
*((unsigned long *) &tmpaddr[0]) = readl(fep->hwp + FEC_ADDR_LOW);
*((unsigned short *) &tmpaddr[4]) = (readl(fep->hwp + FEC_ADDR_HIGH) >> 16);
iap = &tmpaddr[0];
}
memcpy(dev->dev_addr, iap, ETH_ALEN);
/* Adjust MAC if using default MAC address */
if (iap == fec_mac_default)
dev->dev_addr[ETH_ALEN-1] = fec_mac_default[ETH_ALEN-1] + fep->index;
}
#endif
/* ------------------------------------------------------------------------- */
/*
* Phy section
*/
static void fec_enet_adjust_link(struct net_device *dev)
{
struct fec_enet_private *fep = netdev_priv(dev);
struct phy_device *phy_dev = fep->phy_dev;
unsigned long flags;
int status_change = 0;
spin_lock_irqsave(&fep->hw_lock, flags);
/* Prevent a state halted on mii error */
if (fep->mii_timeout && phy_dev->state == PHY_HALTED) {
phy_dev->state = PHY_RESUMING;
goto spin_unlock;
}
/* Duplex link change */
if (phy_dev->link) {
if (fep->full_duplex != phy_dev->duplex) {
fec_restart(dev, phy_dev->duplex);
status_change = 1;
}
}
/* Link on or off change */
if (phy_dev->link != fep->link) {
fep->link = phy_dev->link;
if (phy_dev->link)
fec_restart(dev, phy_dev->duplex);
else
fec_stop(dev);
status_change = 1;
}
spin_unlock:
spin_unlock_irqrestore(&fep->hw_lock, flags);
if (status_change)
phy_print_status(phy_dev);
}
/*
* NOTE: a MII transaction is during around 25 us, so polling it...
*/
static int fec_enet_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
{
struct fec_enet_private *fep = bus->priv;
int timeout = FEC_MII_TIMEOUT;
fep->mii_timeout = 0;
/* clear MII end of transfer bit*/
writel(FEC_ENET_MII, fep->hwp + FEC_IEVENT);
/* start a read op */
writel(FEC_MMFR_ST | FEC_MMFR_OP_READ |
FEC_MMFR_PA(mii_id) | FEC_MMFR_RA(regnum) |
FEC_MMFR_TA, fep->hwp + FEC_MII_DATA);
/* wait for end of transfer */
while (!(readl(fep->hwp + FEC_IEVENT) & FEC_ENET_MII)) {
cpu_relax();
if (timeout-- < 0) {
fep->mii_timeout = 1;
printk(KERN_ERR "FEC: MDIO read timeout\n");
return -ETIMEDOUT;
}
}
/* return value */
return FEC_MMFR_DATA(readl(fep->hwp + FEC_MII_DATA));
}
static int fec_enet_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
u16 value)
{
struct fec_enet_private *fep = bus->priv;
int timeout = FEC_MII_TIMEOUT;
fep->mii_timeout = 0;
/* clear MII end of transfer bit*/
writel(FEC_ENET_MII, fep->hwp + FEC_IEVENT);
/* start a read op */
writel(FEC_MMFR_ST | FEC_MMFR_OP_READ |
FEC_MMFR_PA(mii_id) | FEC_MMFR_RA(regnum) |
FEC_MMFR_TA | FEC_MMFR_DATA(value),
fep->hwp + FEC_MII_DATA);
/* wait for end of transfer */
while (!(readl(fep->hwp + FEC_IEVENT) & FEC_ENET_MII)) {
cpu_relax();
if (timeout-- < 0) {
fep->mii_timeout = 1;
printk(KERN_ERR "FEC: MDIO write timeout\n");
return -ETIMEDOUT;
}
}
return 0;
}
static int fec_enet_mdio_reset(struct mii_bus *bus)
{
return 0;
}
static int fec_enet_mii_probe(struct net_device *dev)
{
struct fec_enet_private *fep = netdev_priv(dev);
struct phy_device *phy_dev = NULL;
int phy_addr;
fep->phy_dev = NULL;
/* find the first phy */
for (phy_addr = 0; phy_addr < PHY_MAX_ADDR; phy_addr++) {
if (fep->mii_bus->phy_map[phy_addr]) {
phy_dev = fep->mii_bus->phy_map[phy_addr];
break;
}
}
if (!phy_dev) {
printk(KERN_ERR "%s: no PHY found\n", dev->name);
return -ENODEV;
}
/* attach the mac to the phy */
phy_dev = phy_connect(dev, dev_name(&phy_dev->dev),
&fec_enet_adjust_link, 0,
PHY_INTERFACE_MODE_MII);
if (IS_ERR(phy_dev)) {
printk(KERN_ERR "%s: Could not attach to PHY\n", dev->name);
return PTR_ERR(phy_dev);
}
/* mask with MAC supported features */
phy_dev->supported &= PHY_BASIC_FEATURES;
phy_dev->advertising = phy_dev->supported;
fep->phy_dev = phy_dev;
fep->link = 0;
fep->full_duplex = 0;
printk(KERN_INFO "%s: Freescale FEC PHY driver [%s] "
"(mii_bus:phy_addr=%s, irq=%d)\n", dev->name,
fep->phy_dev->drv->name, dev_name(&fep->phy_dev->dev),
fep->phy_dev->irq);
return 0;
}
static int fec_enet_mii_init(struct platform_device *pdev)
{
struct net_device *dev = platform_get_drvdata(pdev);
struct fec_enet_private *fep = netdev_priv(dev);
int err = -ENXIO, i;
fep->mii_timeout = 0;
/*
* Set MII speed to 2.5 MHz (= clk_get_rate() / 2 * phy_speed)
*/
fep->phy_speed = DIV_ROUND_UP(clk_get_rate(fep->clk), 5000000) << 1;
writel(fep->phy_speed, fep->hwp + FEC_MII_SPEED);
fep->mii_bus = mdiobus_alloc();
if (fep->mii_bus == NULL) {
err = -ENOMEM;
goto err_out;
}
fep->mii_bus->name = "fec_enet_mii_bus";
fep->mii_bus->read = fec_enet_mdio_read;
fep->mii_bus->write = fec_enet_mdio_write;
fep->mii_bus->reset = fec_enet_mdio_reset;
snprintf(fep->mii_bus->id, MII_BUS_ID_SIZE, "%x", pdev->id);
fep->mii_bus->priv = fep;
fep->mii_bus->parent = &pdev->dev;
fep->mii_bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
if (!fep->mii_bus->irq) {
err = -ENOMEM;
goto err_out_free_mdiobus;
}
for (i = 0; i < PHY_MAX_ADDR; i++)
fep->mii_bus->irq[i] = PHY_POLL;
platform_set_drvdata(dev, fep->mii_bus);
if (mdiobus_register(fep->mii_bus))
goto err_out_free_mdio_irq;
return 0;
err_out_free_mdio_irq:
kfree(fep->mii_bus->irq);
err_out_free_mdiobus:
mdiobus_free(fep->mii_bus);
err_out:
return err;
}
static void fec_enet_mii_remove(struct fec_enet_private *fep)
{
if (fep->phy_dev)
phy_disconnect(fep->phy_dev);
mdiobus_unregister(fep->mii_bus);
kfree(fep->mii_bus->irq);
mdiobus_free(fep->mii_bus);
}
static int fec_enet_get_settings(struct net_device *dev,
struct ethtool_cmd *cmd)
{
struct fec_enet_private *fep = netdev_priv(dev);
struct phy_device *phydev = fep->phy_dev;
if (!phydev)
return -ENODEV;
return phy_ethtool_gset(phydev, cmd);
}
static int fec_enet_set_settings(struct net_device *dev,
struct ethtool_cmd *cmd)
{
struct fec_enet_private *fep = netdev_priv(dev);
struct phy_device *phydev = fep->phy_dev;
if (!phydev)
return -ENODEV;
return phy_ethtool_sset(phydev, cmd);
}
static void fec_enet_get_drvinfo(struct net_device *dev,
struct ethtool_drvinfo *info)
{
struct fec_enet_private *fep = netdev_priv(dev);
strcpy(info->driver, fep->pdev->dev.driver->name);
strcpy(info->version, "Revision: 1.0");
strcpy(info->bus_info, dev_name(&dev->dev));
}
static struct ethtool_ops fec_enet_ethtool_ops = {
.get_settings = fec_enet_get_settings,
.set_settings = fec_enet_set_settings,
.get_drvinfo = fec_enet_get_drvinfo,
.get_link = ethtool_op_get_link,
};
static int fec_enet_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
struct fec_enet_private *fep = netdev_priv(dev);
struct phy_device *phydev = fep->phy_dev;
if (!netif_running(dev))
return -EINVAL;
if (!phydev)
return -ENODEV;
return phy_mii_ioctl(phydev, if_mii(rq), cmd);
}
static void fec_enet_free_buffers(struct net_device *dev)
{
struct fec_enet_private *fep = netdev_priv(dev);
int i;
struct sk_buff *skb;
struct bufdesc *bdp;
bdp = fep->rx_bd_base;
for (i = 0; i < RX_RING_SIZE; i++) {
skb = fep->rx_skbuff[i];
if (bdp->cbd_bufaddr)
dma_unmap_single(&dev->dev, bdp->cbd_bufaddr,
FEC_ENET_RX_FRSIZE, DMA_FROM_DEVICE);
if (skb)
dev_kfree_skb(skb);
bdp++;
}
bdp = fep->tx_bd_base;
for (i = 0; i < TX_RING_SIZE; i++)
kfree(fep->tx_bounce[i]);
}
static int fec_enet_alloc_buffers(struct net_device *dev)
{
struct fec_enet_private *fep = netdev_priv(dev);
int i;
struct sk_buff *skb;
struct bufdesc *bdp;
bdp = fep->rx_bd_base;
for (i = 0; i < RX_RING_SIZE; i++) {
skb = dev_alloc_skb(FEC_ENET_RX_FRSIZE);
if (!skb) {
fec_enet_free_buffers(dev);
return -ENOMEM;
}
fep->rx_skbuff[i] = skb;
bdp->cbd_bufaddr = dma_map_single(&dev->dev, skb->data,
FEC_ENET_RX_FRSIZE, DMA_FROM_DEVICE);
bdp->cbd_sc = BD_ENET_RX_EMPTY;
bdp++;
}
/* Set the last buffer to wrap. */
bdp--;
bdp->cbd_sc |= BD_SC_WRAP;
bdp = fep->tx_bd_base;
for (i = 0; i < TX_RING_SIZE; i++) {
fep->tx_bounce[i] = kmalloc(FEC_ENET_TX_FRSIZE, GFP_KERNEL);
bdp->cbd_sc = 0;
bdp->cbd_bufaddr = 0;
bdp++;
}
/* Set the last buffer to wrap. */
bdp--;
bdp->cbd_sc |= BD_SC_WRAP;
return 0;
}
static int
fec_enet_open(struct net_device *dev)
{
struct fec_enet_private *fep = netdev_priv(dev);
int ret;
/* I should reset the ring buffers here, but I don't yet know
* a simple way to do that.
*/
ret = fec_enet_alloc_buffers(dev);
if (ret)
return ret;
/* Probe and connect to PHY when open the interface */
ret = fec_enet_mii_probe(dev);
if (ret) {
fec_enet_free_buffers(dev);
return ret;
}
phy_start(fep->phy_dev);
netif_start_queue(dev);
fep->opened = 1;
return 0;
}
static int
fec_enet_close(struct net_device *dev)
{
struct fec_enet_private *fep = netdev_priv(dev);
/* Don't know what to do yet. */
fep->opened = 0;
netif_stop_queue(dev);
fec_stop(dev);
if (fep->phy_dev)
phy_disconnect(fep->phy_dev);
fec_enet_free_buffers(dev);
return 0;
}
/* Set or clear the multicast filter for this adaptor.
* Skeleton taken from sunlance driver.
* The CPM Ethernet implementation allows Multicast as well as individual
* MAC address filtering. Some of the drivers check to make sure it is
* a group multicast address, and discard those that are not. I guess I
* will do the same for now, but just remove the test if you want
* individual filtering as well (do the upper net layers want or support
* this kind of feature?).
*/
#define HASH_BITS 6 /* #bits in hash */
#define CRC32_POLY 0xEDB88320
static void set_multicast_list(struct net_device *dev)
{
struct fec_enet_private *fep = netdev_priv(dev);
struct netdev_hw_addr *ha;
unsigned int i, bit, data, crc, tmp;
unsigned char hash;
if (dev->flags & IFF_PROMISC) {
tmp = readl(fep->hwp + FEC_R_CNTRL);
tmp |= 0x8;
writel(tmp, fep->hwp + FEC_R_CNTRL);
return;
}
tmp = readl(fep->hwp + FEC_R_CNTRL);
tmp &= ~0x8;
writel(tmp, fep->hwp + FEC_R_CNTRL);
if (dev->flags & IFF_ALLMULTI) {
/* Catch all multicast addresses, so set the
* filter to all 1's
*/
writel(0xffffffff, fep->hwp + FEC_GRP_HASH_TABLE_HIGH);
writel(0xffffffff, fep->hwp + FEC_GRP_HASH_TABLE_LOW);
return;
}
/* Clear filter and add the addresses in hash register
*/
writel(0, fep->hwp + FEC_GRP_HASH_TABLE_HIGH);
writel(0, fep->hwp + FEC_GRP_HASH_TABLE_LOW);
netdev_for_each_mc_addr(ha, dev) {
/* Only support group multicast for now */
if (!(ha->addr[0] & 1))
continue;
/* calculate crc32 value of mac address */
crc = 0xffffffff;
for (i = 0; i < dev->addr_len; i++) {
data = ha->addr[i];
for (bit = 0; bit < 8; bit++, data >>= 1) {
crc = (crc >> 1) ^
(((crc ^ data) & 1) ? CRC32_POLY : 0);
}
}
/* only upper 6 bits (HASH_BITS) are used
* which point to specific bit in he hash registers
*/
hash = (crc >> (32 - HASH_BITS)) & 0x3f;
if (hash > 31) {
tmp = readl(fep->hwp + FEC_GRP_HASH_TABLE_HIGH);
tmp |= 1 << (hash - 32);
writel(tmp, fep->hwp + FEC_GRP_HASH_TABLE_HIGH);
} else {
tmp = readl(fep->hwp + FEC_GRP_HASH_TABLE_LOW);
tmp |= 1 << hash;
writel(tmp, fep->hwp + FEC_GRP_HASH_TABLE_LOW);
}
}
}
/* Set a MAC change in hardware. */
static int
fec_set_mac_address(struct net_device *dev, void *p)
{
struct fec_enet_private *fep = netdev_priv(dev);
struct sockaddr *addr = p;
if (!is_valid_ether_addr(addr->sa_data))
return -EADDRNOTAVAIL;
memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
writel(dev->dev_addr[3] | (dev->dev_addr[2] << 8) |
(dev->dev_addr[1] << 16) | (dev->dev_addr[0] << 24),
fep->hwp + FEC_ADDR_LOW);
writel((dev->dev_addr[5] << 16) | (dev->dev_addr[4] << 24),
fep->hwp + FEC_ADDR_HIGH);
return 0;
}
static const struct net_device_ops fec_netdev_ops = {
.ndo_open = fec_enet_open,
.ndo_stop = fec_enet_close,
.ndo_start_xmit = fec_enet_start_xmit,
.ndo_set_multicast_list = set_multicast_list,
.ndo_change_mtu = eth_change_mtu,
.ndo_validate_addr = eth_validate_addr,
.ndo_tx_timeout = fec_timeout,
.ndo_set_mac_address = fec_set_mac_address,
.ndo_do_ioctl = fec_enet_ioctl,
};
/*
* XXX: We need to clean up on failure exits here.
*
* index is only used in legacy code
*/
static int fec_enet_init(struct net_device *dev, int index)
{
struct fec_enet_private *fep = netdev_priv(dev);
struct bufdesc *cbd_base;
struct bufdesc *bdp;
int i;
/* Allocate memory for buffer descriptors. */
cbd_base = dma_alloc_coherent(NULL, PAGE_SIZE, &fep->bd_dma,
GFP_KERNEL);
if (!cbd_base) {
printk("FEC: allocate descriptor memory failed?\n");
return -ENOMEM;
}
spin_lock_init(&fep->hw_lock);
fep->index = index;
fep->hwp = (void __iomem *)dev->base_addr;
fep->netdev = dev;
/* Set the Ethernet address */
#ifdef CONFIG_M5272
fec_get_mac(dev);
#else
{
unsigned long l;
l = readl(fep->hwp + FEC_ADDR_LOW);
dev->dev_addr[0] = (unsigned char)((l & 0xFF000000) >> 24);
dev->dev_addr[1] = (unsigned char)((l & 0x00FF0000) >> 16);
dev->dev_addr[2] = (unsigned char)((l & 0x0000FF00) >> 8);
dev->dev_addr[3] = (unsigned char)((l & 0x000000FF) >> 0);
l = readl(fep->hwp + FEC_ADDR_HIGH);
dev->dev_addr[4] = (unsigned char)((l & 0xFF000000) >> 24);
dev->dev_addr[5] = (unsigned char)((l & 0x00FF0000) >> 16);
}
#endif
/* Set receive and transmit descriptor base. */
fep->rx_bd_base = cbd_base;
fep->tx_bd_base = cbd_base + RX_RING_SIZE;
/* The FEC Ethernet specific entries in the device structure */
dev->watchdog_timeo = TX_TIMEOUT;
dev->netdev_ops = &fec_netdev_ops;
dev->ethtool_ops = &fec_enet_ethtool_ops;
/* Initialize the receive buffer descriptors. */
bdp = fep->rx_bd_base;
for (i = 0; i < RX_RING_SIZE; i++) {
/* Initialize the BD for every fragment in the page. */
bdp->cbd_sc = 0;
bdp++;
}
/* Set the last buffer to wrap */
bdp--;
bdp->cbd_sc |= BD_SC_WRAP;
/* ...and the same for transmit */
bdp = fep->tx_bd_base;
for (i = 0; i < TX_RING_SIZE; i++) {
/* Initialize the BD for every fragment in the page. */
bdp->cbd_sc = 0;
bdp->cbd_bufaddr = 0;
bdp++;
}
/* Set the last buffer to wrap */
bdp--;
bdp->cbd_sc |= BD_SC_WRAP;
fec_restart(dev, 0);
return 0;
}
/* This function is called to start or restart the FEC during a link
* change. This only happens when switching between half and full
* duplex.
*/
static void
fec_restart(struct net_device *dev, int duplex)
{
struct fec_enet_private *fep = netdev_priv(dev);
int i;
/* Whack a reset. We should wait for this. */
writel(1, fep->hwp + FEC_ECNTRL);
udelay(10);
/* Clear any outstanding interrupt. */
writel(0xffc00000, fep->hwp + FEC_IEVENT);
/* Reset all multicast. */
writel(0, fep->hwp + FEC_GRP_HASH_TABLE_HIGH);
writel(0, fep->hwp + FEC_GRP_HASH_TABLE_LOW);
#ifndef CONFIG_M5272
writel(0, fep->hwp + FEC_HASH_TABLE_HIGH);
writel(0, fep->hwp + FEC_HASH_TABLE_LOW);
#endif
/* Set maximum receive buffer size. */
writel(PKT_MAXBLR_SIZE, fep->hwp + FEC_R_BUFF_SIZE);
/* Set receive and transmit descriptor base. */
writel(fep->bd_dma, fep->hwp + FEC_R_DES_START);
writel((unsigned long)fep->bd_dma + sizeof(struct bufdesc) * RX_RING_SIZE,
fep->hwp + FEC_X_DES_START);
fep->dirty_tx = fep->cur_tx = fep->tx_bd_base;
fep->cur_rx = fep->rx_bd_base;
/* Reset SKB transmit buffers. */
fep->skb_cur = fep->skb_dirty = 0;
for (i = 0; i <= TX_RING_MOD_MASK; i++) {
if (fep->tx_skbuff[i]) {
dev_kfree_skb_any(fep->tx_skbuff[i]);
fep->tx_skbuff[i] = NULL;
}
}
/* Enable MII mode */
if (duplex) {
/* MII enable / FD enable */
writel(OPT_FRAME_SIZE | 0x04, fep->hwp + FEC_R_CNTRL);
writel(0x04, fep->hwp + FEC_X_CNTRL);
} else {
/* MII enable / No Rcv on Xmit */
writel(OPT_FRAME_SIZE | 0x06, fep->hwp + FEC_R_CNTRL);
writel(0x0, fep->hwp + FEC_X_CNTRL);
}
fep->full_duplex = duplex;
/* Set MII speed */
writel(fep->phy_speed, fep->hwp + FEC_MII_SPEED);
#ifdef FEC_MIIGSK_ENR
if (fep->phy_interface == PHY_INTERFACE_MODE_RMII) {
/* disable the gasket and wait */
writel(0, fep->hwp + FEC_MIIGSK_ENR);
while (readl(fep->hwp + FEC_MIIGSK_ENR) & 4)
udelay(1);
/* configure the gasket: RMII, 50 MHz, no loopback, no echo */
writel(1, fep->hwp + FEC_MIIGSK_CFGR);
/* re-enable the gasket */
writel(2, fep->hwp + FEC_MIIGSK_ENR);
}
#endif
/* And last, enable the transmit and receive processing */
writel(2, fep->hwp + FEC_ECNTRL);
writel(0, fep->hwp + FEC_R_DES_ACTIVE);
/* Enable interrupts we wish to service */
writel(FEC_ENET_TXF | FEC_ENET_RXF, fep->hwp + FEC_IMASK);
}
static void
fec_stop(struct net_device *dev)
{
struct fec_enet_private *fep = netdev_priv(dev);
/* We cannot expect a graceful transmit stop without link !!! */
if (fep->link) {
writel(1, fep->hwp + FEC_X_CNTRL); /* Graceful transmit stop */
udelay(10);
if (!(readl(fep->hwp + FEC_IEVENT) & FEC_ENET_GRA))
printk("fec_stop : Graceful transmit stop did not complete !\n");
}
/* Whack a reset. We should wait for this. */
writel(1, fep->hwp + FEC_ECNTRL);
udelay(10);
/* Clear outstanding MII command interrupts. */
writel(FEC_ENET_MII, fep->hwp + FEC_IEVENT);
writel(fep->phy_speed, fep->hwp + FEC_MII_SPEED);
}
static int __devinit
fec_probe(struct platform_device *pdev)
{
struct fec_enet_private *fep;
struct fec_platform_data *pdata;
struct net_device *ndev;
int i, irq, ret = 0;
struct resource *r;
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!r)
return -ENXIO;
r = request_mem_region(r->start, resource_size(r), pdev->name);
if (!r)
return -EBUSY;
/* Init network device */
ndev = alloc_etherdev(sizeof(struct fec_enet_private));
if (!ndev)
return -ENOMEM;
SET_NETDEV_DEV(ndev, &pdev->dev);
/* setup board info structure */
fep = netdev_priv(ndev);
memset(fep, 0, sizeof(*fep));
ndev->base_addr = (unsigned long)ioremap(r->start, resource_size(r));
fep->pdev = pdev;
if (!ndev->base_addr) {
ret = -ENOMEM;
goto failed_ioremap;
}
platform_set_drvdata(pdev, ndev);
pdata = pdev->dev.platform_data;
if (pdata)
fep->phy_interface = pdata->phy;
/* This device has up to three irqs on some platforms */
for (i = 0; i < 3; i++) {
irq = platform_get_irq(pdev, i);
if (i && irq < 0)
break;
ret = request_irq(irq, fec_enet_interrupt, IRQF_DISABLED, pdev->name, ndev);
if (ret) {
while (i >= 0) {
irq = platform_get_irq(pdev, i);
free_irq(irq, ndev);
i--;
}
goto failed_irq;
}
}
fep->clk = clk_get(&pdev->dev, "fec_clk");
if (IS_ERR(fep->clk)) {
ret = PTR_ERR(fep->clk);
goto failed_clk;
}
clk_enable(fep->clk);
ret = fec_enet_init(ndev, 0);
if (ret)
goto failed_init;
ret = fec_enet_mii_init(pdev);
if (ret)
goto failed_mii_init;
ret = register_netdev(ndev);
if (ret)
goto failed_register;
return 0;
failed_register:
fec_enet_mii_remove(fep);
failed_mii_init:
failed_init:
clk_disable(fep->clk);
clk_put(fep->clk);
failed_clk:
for (i = 0; i < 3; i++) {
irq = platform_get_irq(pdev, i);
if (irq > 0)
free_irq(irq, ndev);
}
failed_irq:
iounmap((void __iomem *)ndev->base_addr);
failed_ioremap:
free_netdev(ndev);
return ret;
}
static int __devexit
fec_drv_remove(struct platform_device *pdev)
{
struct net_device *ndev = platform_get_drvdata(pdev);
struct fec_enet_private *fep = netdev_priv(ndev);
platform_set_drvdata(pdev, NULL);
fec_stop(ndev);
fec_enet_mii_remove(fep);
clk_disable(fep->clk);
clk_put(fep->clk);
iounmap((void __iomem *)ndev->base_addr);
unregister_netdev(ndev);
free_netdev(ndev);
return 0;
}
static int
fec_suspend(struct platform_device *dev, pm_message_t state)
{
struct net_device *ndev = platform_get_drvdata(dev);
struct fec_enet_private *fep;
if (ndev) {
fep = netdev_priv(ndev);
if (netif_running(ndev)) {
netif_device_detach(ndev);
fec_stop(ndev);
}
}
return 0;
}
static int
fec_resume(struct platform_device *dev)
{
struct net_device *ndev = platform_get_drvdata(dev);
if (ndev) {
if (netif_running(ndev)) {
fec_enet_init(ndev, 0);
netif_device_attach(ndev);
}
}
return 0;
}
static struct platform_driver fec_driver = {
.driver = {
.name = "fec",
.owner = THIS_MODULE,
},
.probe = fec_probe,
.remove = __devexit_p(fec_drv_remove),
.suspend = fec_suspend,
.resume = fec_resume,
};
static int __init
fec_enet_module_init(void)
{
printk(KERN_INFO "FEC Ethernet Driver\n");
return platform_driver_register(&fec_driver);
}
static void __exit
fec_enet_cleanup(void)
{
platform_driver_unregister(&fec_driver);
}
module_exit(fec_enet_cleanup);
module_init(fec_enet_module_init);
MODULE_LICENSE("GPL");
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