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linux_dsm_epyc7002/drivers/net/ethernet/cadence/macb.c
Soren Brinkmann c8ea5a22bd net: macb: Fix race between HW and driver 
Under "heavy" RX load, the driver cannot handle the descriptors fast
enough. In detail, when a descriptor is consumed, its used flag is
cleared and once the RX budget is consumed all descriptors with a
cleared used flag are prepared to receive more data. Under load though,
the HW may constantly receive more data and use those descriptors with a
cleared used flag before they are actually prepared for next usage.

The head and tail pointers into the RX-ring should always be valid and
we can omit clearing and checking of the used flag.

Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-05-05 17:11:18 -04:00

2068 lines
50 KiB
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/*
* Cadence MACB/GEM Ethernet Controller driver
*
* Copyright (C) 2004-2006 Atmel Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/circ_buf.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/dma-mapping.h>
#include <linux/platform_data/macb.h>
#include <linux/platform_device.h>
#include <linux/phy.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_mdio.h>
#include <linux/of_net.h>
#include <linux/pinctrl/consumer.h>
#include "macb.h"
#define MACB_RX_BUFFER_SIZE 128
#define RX_BUFFER_MULTIPLE 64 /* bytes */
#define RX_RING_SIZE 512 /* must be power of 2 */
#define RX_RING_BYTES (sizeof(struct macb_dma_desc) * RX_RING_SIZE)
#define TX_RING_SIZE 128 /* must be power of 2 */
#define TX_RING_BYTES (sizeof(struct macb_dma_desc) * TX_RING_SIZE)
/* level of occupied TX descriptors under which we wake up TX process */
#define MACB_TX_WAKEUP_THRESH (3 * TX_RING_SIZE / 4)
#define MACB_RX_INT_FLAGS (MACB_BIT(RCOMP) | MACB_BIT(RXUBR) \
| MACB_BIT(ISR_ROVR))
#define MACB_TX_ERR_FLAGS (MACB_BIT(ISR_TUND) \
| MACB_BIT(ISR_RLE) \
| MACB_BIT(TXERR))
#define MACB_TX_INT_FLAGS (MACB_TX_ERR_FLAGS | MACB_BIT(TCOMP))
/*
* Graceful stop timeouts in us. We should allow up to
* 1 frame time (10 Mbits/s, full-duplex, ignoring collisions)
*/
#define MACB_HALT_TIMEOUT 1230
/* Ring buffer accessors */
static unsigned int macb_tx_ring_wrap(unsigned int index)
{
return index & (TX_RING_SIZE - 1);
}
static struct macb_dma_desc *macb_tx_desc(struct macb *bp, unsigned int index)
{
return &bp->tx_ring[macb_tx_ring_wrap(index)];
}
static struct macb_tx_skb *macb_tx_skb(struct macb *bp, unsigned int index)
{
return &bp->tx_skb[macb_tx_ring_wrap(index)];
}
static dma_addr_t macb_tx_dma(struct macb *bp, unsigned int index)
{
dma_addr_t offset;
offset = macb_tx_ring_wrap(index) * sizeof(struct macb_dma_desc);
return bp->tx_ring_dma + offset;
}
static unsigned int macb_rx_ring_wrap(unsigned int index)
{
return index & (RX_RING_SIZE - 1);
}
static struct macb_dma_desc *macb_rx_desc(struct macb *bp, unsigned int index)
{
return &bp->rx_ring[macb_rx_ring_wrap(index)];
}
static void *macb_rx_buffer(struct macb *bp, unsigned int index)
{
return bp->rx_buffers + bp->rx_buffer_size * macb_rx_ring_wrap(index);
}
void macb_set_hwaddr(struct macb *bp)
{
u32 bottom;
u16 top;
bottom = cpu_to_le32(*((u32 *)bp->dev->dev_addr));
macb_or_gem_writel(bp, SA1B, bottom);
top = cpu_to_le16(*((u16 *)(bp->dev->dev_addr + 4)));
macb_or_gem_writel(bp, SA1T, top);
/* Clear unused address register sets */
macb_or_gem_writel(bp, SA2B, 0);
macb_or_gem_writel(bp, SA2T, 0);
macb_or_gem_writel(bp, SA3B, 0);
macb_or_gem_writel(bp, SA3T, 0);
macb_or_gem_writel(bp, SA4B, 0);
macb_or_gem_writel(bp, SA4T, 0);
}
EXPORT_SYMBOL_GPL(macb_set_hwaddr);
void macb_get_hwaddr(struct macb *bp)
{
struct macb_platform_data *pdata;
u32 bottom;
u16 top;
u8 addr[6];
int i;
pdata = dev_get_platdata(&bp->pdev->dev);
/* Check all 4 address register for vaild address */
for (i = 0; i < 4; i++) {
bottom = macb_or_gem_readl(bp, SA1B + i * 8);
top = macb_or_gem_readl(bp, SA1T + i * 8);
if (pdata && pdata->rev_eth_addr) {
addr[5] = bottom & 0xff;
addr[4] = (bottom >> 8) & 0xff;
addr[3] = (bottom >> 16) & 0xff;
addr[2] = (bottom >> 24) & 0xff;
addr[1] = top & 0xff;
addr[0] = (top & 0xff00) >> 8;
} else {
addr[0] = bottom & 0xff;
addr[1] = (bottom >> 8) & 0xff;
addr[2] = (bottom >> 16) & 0xff;
addr[3] = (bottom >> 24) & 0xff;
addr[4] = top & 0xff;
addr[5] = (top >> 8) & 0xff;
}
if (is_valid_ether_addr(addr)) {
memcpy(bp->dev->dev_addr, addr, sizeof(addr));
return;
}
}
netdev_info(bp->dev, "invalid hw address, using random\n");
eth_hw_addr_random(bp->dev);
}
EXPORT_SYMBOL_GPL(macb_get_hwaddr);
static int macb_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
{
struct macb *bp = bus->priv;
int value;
macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_SOF)
| MACB_BF(RW, MACB_MAN_READ)
| MACB_BF(PHYA, mii_id)
| MACB_BF(REGA, regnum)
| MACB_BF(CODE, MACB_MAN_CODE)));
/* wait for end of transfer */
while (!MACB_BFEXT(IDLE, macb_readl(bp, NSR)))
cpu_relax();
value = MACB_BFEXT(DATA, macb_readl(bp, MAN));
return value;
}
static int macb_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
u16 value)
{
struct macb *bp = bus->priv;
macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_SOF)
| MACB_BF(RW, MACB_MAN_WRITE)
| MACB_BF(PHYA, mii_id)
| MACB_BF(REGA, regnum)
| MACB_BF(CODE, MACB_MAN_CODE)
| MACB_BF(DATA, value)));
/* wait for end of transfer */
while (!MACB_BFEXT(IDLE, macb_readl(bp, NSR)))
cpu_relax();
return 0;
}
/**
* macb_set_tx_clk() - Set a clock to a new frequency
* @clk Pointer to the clock to change
* @rate New frequency in Hz
* @dev Pointer to the struct net_device
*/
static void macb_set_tx_clk(struct clk *clk, int speed, struct net_device *dev)
{
long ferr, rate, rate_rounded;
switch (speed) {
case SPEED_10:
rate = 2500000;
break;
case SPEED_100:
rate = 25000000;
break;
case SPEED_1000:
rate = 125000000;
break;
default:
return;
}
rate_rounded = clk_round_rate(clk, rate);
if (rate_rounded < 0)
return;
/* RGMII allows 50 ppm frequency error. Test and warn if this limit
* is not satisfied.
*/
ferr = abs(rate_rounded - rate);
ferr = DIV_ROUND_UP(ferr, rate / 100000);
if (ferr > 5)
netdev_warn(dev, "unable to generate target frequency: %ld Hz\n",
rate);
if (clk_set_rate(clk, rate_rounded))
netdev_err(dev, "adjusting tx_clk failed.\n");
}
static void macb_handle_link_change(struct net_device *dev)
{
struct macb *bp = netdev_priv(dev);
struct phy_device *phydev = bp->phy_dev;
unsigned long flags;
int status_change = 0;
spin_lock_irqsave(&bp->lock, flags);
if (phydev->link) {
if ((bp->speed != phydev->speed) ||
(bp->duplex != phydev->duplex)) {
u32 reg;
reg = macb_readl(bp, NCFGR);
reg &= ~(MACB_BIT(SPD) | MACB_BIT(FD));
if (macb_is_gem(bp))
reg &= ~GEM_BIT(GBE);
if (phydev->duplex)
reg |= MACB_BIT(FD);
if (phydev->speed == SPEED_100)
reg |= MACB_BIT(SPD);
if (phydev->speed == SPEED_1000)
reg |= GEM_BIT(GBE);
macb_or_gem_writel(bp, NCFGR, reg);
bp->speed = phydev->speed;
bp->duplex = phydev->duplex;
status_change = 1;
}
}
if (phydev->link != bp->link) {
if (!phydev->link) {
bp->speed = 0;
bp->duplex = -1;
}
bp->link = phydev->link;
status_change = 1;
}
spin_unlock_irqrestore(&bp->lock, flags);
if (!IS_ERR(bp->tx_clk))
macb_set_tx_clk(bp->tx_clk, phydev->speed, dev);
if (status_change) {
if (phydev->link) {
netif_carrier_on(dev);
netdev_info(dev, "link up (%d/%s)\n",
phydev->speed,
phydev->duplex == DUPLEX_FULL ?
"Full" : "Half");
} else {
netif_carrier_off(dev);
netdev_info(dev, "link down\n");
}
}
}
/* based on au1000_eth. c*/
static int macb_mii_probe(struct net_device *dev)
{
struct macb *bp = netdev_priv(dev);
struct macb_platform_data *pdata;
struct phy_device *phydev;
int phy_irq;
int ret;
phydev = phy_find_first(bp->mii_bus);
if (!phydev) {
netdev_err(dev, "no PHY found\n");
return -ENXIO;
}
pdata = dev_get_platdata(&bp->pdev->dev);
if (pdata && gpio_is_valid(pdata->phy_irq_pin)) {
ret = devm_gpio_request(&bp->pdev->dev, pdata->phy_irq_pin, "phy int");
if (!ret) {
phy_irq = gpio_to_irq(pdata->phy_irq_pin);
phydev->irq = (phy_irq < 0) ? PHY_POLL : phy_irq;
}
}
/* attach the mac to the phy */
ret = phy_connect_direct(dev, phydev, &macb_handle_link_change,
bp->phy_interface);
if (ret) {
netdev_err(dev, "Could not attach to PHY\n");
return ret;
}
/* mask with MAC supported features */
if (macb_is_gem(bp))
phydev->supported &= PHY_GBIT_FEATURES;
else
phydev->supported &= PHY_BASIC_FEATURES;
phydev->advertising = phydev->supported;
bp->link = 0;
bp->speed = 0;
bp->duplex = -1;
bp->phy_dev = phydev;
return 0;
}
int macb_mii_init(struct macb *bp)
{
struct macb_platform_data *pdata;
struct device_node *np;
int err = -ENXIO, i;
/* Enable management port */
macb_writel(bp, NCR, MACB_BIT(MPE));
bp->mii_bus = mdiobus_alloc();
if (bp->mii_bus == NULL) {
err = -ENOMEM;
goto err_out;
}
bp->mii_bus->name = "MACB_mii_bus";
bp->mii_bus->read = &macb_mdio_read;
bp->mii_bus->write = &macb_mdio_write;
snprintf(bp->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x",
bp->pdev->name, bp->pdev->id);
bp->mii_bus->priv = bp;
bp->mii_bus->parent = &bp->dev->dev;
pdata = dev_get_platdata(&bp->pdev->dev);
bp->mii_bus->irq = kmalloc(sizeof(int)*PHY_MAX_ADDR, GFP_KERNEL);
if (!bp->mii_bus->irq) {
err = -ENOMEM;
goto err_out_free_mdiobus;
}
dev_set_drvdata(&bp->dev->dev, bp->mii_bus);
np = bp->pdev->dev.of_node;
if (np) {
/* try dt phy registration */
err = of_mdiobus_register(bp->mii_bus, np);
/* fallback to standard phy registration if no phy were
found during dt phy registration */
if (!err && !phy_find_first(bp->mii_bus)) {
for (i = 0; i < PHY_MAX_ADDR; i++) {
struct phy_device *phydev;
phydev = mdiobus_scan(bp->mii_bus, i);
if (IS_ERR(phydev)) {
err = PTR_ERR(phydev);
break;
}
}
if (err)
goto err_out_unregister_bus;
}
} else {
for (i = 0; i < PHY_MAX_ADDR; i++)
bp->mii_bus->irq[i] = PHY_POLL;
if (pdata)
bp->mii_bus->phy_mask = pdata->phy_mask;
err = mdiobus_register(bp->mii_bus);
}
if (err)
goto err_out_free_mdio_irq;
err = macb_mii_probe(bp->dev);
if (err)
goto err_out_unregister_bus;
return 0;
err_out_unregister_bus:
mdiobus_unregister(bp->mii_bus);
err_out_free_mdio_irq:
kfree(bp->mii_bus->irq);
err_out_free_mdiobus:
mdiobus_free(bp->mii_bus);
err_out:
return err;
}
EXPORT_SYMBOL_GPL(macb_mii_init);
static void macb_update_stats(struct macb *bp)
{
u32 __iomem *reg = bp->regs + MACB_PFR;
u32 *p = &bp->hw_stats.macb.rx_pause_frames;
u32 *end = &bp->hw_stats.macb.tx_pause_frames + 1;
WARN_ON((unsigned long)(end - p - 1) != (MACB_TPF - MACB_PFR) / 4);
for(; p < end; p++, reg++)
*p += __raw_readl(reg);
}
static int macb_halt_tx(struct macb *bp)
{
unsigned long halt_time, timeout;
u32 status;
macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(THALT));
timeout = jiffies + usecs_to_jiffies(MACB_HALT_TIMEOUT);
do {
halt_time = jiffies;
status = macb_readl(bp, TSR);
if (!(status & MACB_BIT(TGO)))
return 0;
usleep_range(10, 250);
} while (time_before(halt_time, timeout));
return -ETIMEDOUT;
}
static void macb_tx_error_task(struct work_struct *work)
{
struct macb *bp = container_of(work, struct macb, tx_error_task);
struct macb_tx_skb *tx_skb;
struct sk_buff *skb;
unsigned int tail;
netdev_vdbg(bp->dev, "macb_tx_error_task: t = %u, h = %u\n",
bp->tx_tail, bp->tx_head);
/* Make sure nobody is trying to queue up new packets */
netif_stop_queue(bp->dev);
/*
* Stop transmission now
* (in case we have just queued new packets)
*/
if (macb_halt_tx(bp))
/* Just complain for now, reinitializing TX path can be good */
netdev_err(bp->dev, "BUG: halt tx timed out\n");
/* No need for the lock here as nobody will interrupt us anymore */
/*
* Treat frames in TX queue including the ones that caused the error.
* Free transmit buffers in upper layer.
*/
for (tail = bp->tx_tail; tail != bp->tx_head; tail++) {
struct macb_dma_desc *desc;
u32 ctrl;
desc = macb_tx_desc(bp, tail);
ctrl = desc->ctrl;
tx_skb = macb_tx_skb(bp, tail);
skb = tx_skb->skb;
if (ctrl & MACB_BIT(TX_USED)) {
netdev_vdbg(bp->dev, "txerr skb %u (data %p) TX complete\n",
macb_tx_ring_wrap(tail), skb->data);
bp->stats.tx_packets++;
bp->stats.tx_bytes += skb->len;
} else {
/*
* "Buffers exhausted mid-frame" errors may only happen
* if the driver is buggy, so complain loudly about those.
* Statistics are updated by hardware.
*/
if (ctrl & MACB_BIT(TX_BUF_EXHAUSTED))
netdev_err(bp->dev,
"BUG: TX buffers exhausted mid-frame\n");
desc->ctrl = ctrl | MACB_BIT(TX_USED);
}
dma_unmap_single(&bp->pdev->dev, tx_skb->mapping, skb->len,
DMA_TO_DEVICE);
tx_skb->skb = NULL;
dev_kfree_skb(skb);
}
/* Make descriptor updates visible to hardware */
wmb();
/* Reinitialize the TX desc queue */
macb_writel(bp, TBQP, bp->tx_ring_dma);
/* Make TX ring reflect state of hardware */
bp->tx_head = bp->tx_tail = 0;
/* Now we are ready to start transmission again */
netif_wake_queue(bp->dev);
/* Housework before enabling TX IRQ */
macb_writel(bp, TSR, macb_readl(bp, TSR));
macb_writel(bp, IER, MACB_TX_INT_FLAGS);
}
static void macb_tx_interrupt(struct macb *bp)
{
unsigned int tail;
unsigned int head;
u32 status;
status = macb_readl(bp, TSR);
macb_writel(bp, TSR, status);
if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
macb_writel(bp, ISR, MACB_BIT(TCOMP));
netdev_vdbg(bp->dev, "macb_tx_interrupt status = 0x%03lx\n",
(unsigned long)status);
head = bp->tx_head;
for (tail = bp->tx_tail; tail != head; tail++) {
struct macb_tx_skb *tx_skb;
struct sk_buff *skb;
struct macb_dma_desc *desc;
u32 ctrl;
desc = macb_tx_desc(bp, tail);
/* Make hw descriptor updates visible to CPU */
rmb();
ctrl = desc->ctrl;
if (!(ctrl & MACB_BIT(TX_USED)))
break;
tx_skb = macb_tx_skb(bp, tail);
skb = tx_skb->skb;
netdev_vdbg(bp->dev, "skb %u (data %p) TX complete\n",
macb_tx_ring_wrap(tail), skb->data);
dma_unmap_single(&bp->pdev->dev, tx_skb->mapping, skb->len,
DMA_TO_DEVICE);
bp->stats.tx_packets++;
bp->stats.tx_bytes += skb->len;
tx_skb->skb = NULL;
dev_kfree_skb_irq(skb);
}
bp->tx_tail = tail;
if (netif_queue_stopped(bp->dev)
&& CIRC_CNT(bp->tx_head, bp->tx_tail,
TX_RING_SIZE) <= MACB_TX_WAKEUP_THRESH)
netif_wake_queue(bp->dev);
}
static void gem_rx_refill(struct macb *bp)
{
unsigned int entry;
struct sk_buff *skb;
dma_addr_t paddr;
while (CIRC_SPACE(bp->rx_prepared_head, bp->rx_tail, RX_RING_SIZE) > 0) {
entry = macb_rx_ring_wrap(bp->rx_prepared_head);
/* Make hw descriptor updates visible to CPU */
rmb();
bp->rx_prepared_head++;
if (bp->rx_skbuff[entry] == NULL) {
/* allocate sk_buff for this free entry in ring */
skb = netdev_alloc_skb(bp->dev, bp->rx_buffer_size);
if (unlikely(skb == NULL)) {
netdev_err(bp->dev,
"Unable to allocate sk_buff\n");
break;
}
/* now fill corresponding descriptor entry */
paddr = dma_map_single(&bp->pdev->dev, skb->data,
bp->rx_buffer_size, DMA_FROM_DEVICE);
if (dma_mapping_error(&bp->pdev->dev, paddr)) {
dev_kfree_skb(skb);
break;
}
bp->rx_skbuff[entry] = skb;
if (entry == RX_RING_SIZE - 1)
paddr |= MACB_BIT(RX_WRAP);
bp->rx_ring[entry].addr = paddr;
bp->rx_ring[entry].ctrl = 0;
/* properly align Ethernet header */
skb_reserve(skb, NET_IP_ALIGN);
}
}
/* Make descriptor updates visible to hardware */
wmb();
netdev_vdbg(bp->dev, "rx ring: prepared head %d, tail %d\n",
bp->rx_prepared_head, bp->rx_tail);
}
/* Mark DMA descriptors from begin up to and not including end as unused */
static void discard_partial_frame(struct macb *bp, unsigned int begin,
unsigned int end)
{
unsigned int frag;
for (frag = begin; frag != end; frag++) {
struct macb_dma_desc *desc = macb_rx_desc(bp, frag);
desc->addr &= ~MACB_BIT(RX_USED);
}
/* Make descriptor updates visible to hardware */
wmb();
/*
* When this happens, the hardware stats registers for
* whatever caused this is updated, so we don't have to record
* anything.
*/
}
static int gem_rx(struct macb *bp, int budget)
{
unsigned int len;
unsigned int entry;
struct sk_buff *skb;
struct macb_dma_desc *desc;
int count = 0;
while (count < budget) {
u32 addr, ctrl;
entry = macb_rx_ring_wrap(bp->rx_tail);
desc = &bp->rx_ring[entry];
/* Make hw descriptor updates visible to CPU */
rmb();
addr = desc->addr;
ctrl = desc->ctrl;
if (!(addr & MACB_BIT(RX_USED)))
break;
bp->rx_tail++;
count++;
if (!(ctrl & MACB_BIT(RX_SOF) && ctrl & MACB_BIT(RX_EOF))) {
netdev_err(bp->dev,
"not whole frame pointed by descriptor\n");
bp->stats.rx_dropped++;
break;
}
skb = bp->rx_skbuff[entry];
if (unlikely(!skb)) {
netdev_err(bp->dev,
"inconsistent Rx descriptor chain\n");
bp->stats.rx_dropped++;
break;
}
/* now everything is ready for receiving packet */
bp->rx_skbuff[entry] = NULL;
len = MACB_BFEXT(RX_FRMLEN, ctrl);
netdev_vdbg(bp->dev, "gem_rx %u (len %u)\n", entry, len);
skb_put(skb, len);
addr = MACB_BF(RX_WADDR, MACB_BFEXT(RX_WADDR, addr));
dma_unmap_single(&bp->pdev->dev, addr,
bp->rx_buffer_size, DMA_FROM_DEVICE);
skb->protocol = eth_type_trans(skb, bp->dev);
skb_checksum_none_assert(skb);
bp->stats.rx_packets++;
bp->stats.rx_bytes += skb->len;
#if defined(DEBUG) && defined(VERBOSE_DEBUG)
netdev_vdbg(bp->dev, "received skb of length %u, csum: %08x\n",
skb->len, skb->csum);
print_hex_dump(KERN_DEBUG, " mac: ", DUMP_PREFIX_ADDRESS, 16, 1,
skb->mac_header, 16, true);
print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_ADDRESS, 16, 1,
skb->data, 32, true);
#endif
netif_receive_skb(skb);
}
gem_rx_refill(bp);
return count;
}
static int macb_rx_frame(struct macb *bp, unsigned int first_frag,
unsigned int last_frag)
{
unsigned int len;
unsigned int frag;
unsigned int offset;
struct sk_buff *skb;
struct macb_dma_desc *desc;
desc = macb_rx_desc(bp, last_frag);
len = MACB_BFEXT(RX_FRMLEN, desc->ctrl);
netdev_vdbg(bp->dev, "macb_rx_frame frags %u - %u (len %u)\n",
macb_rx_ring_wrap(first_frag),
macb_rx_ring_wrap(last_frag), len);
/*
* The ethernet header starts NET_IP_ALIGN bytes into the
* first buffer. Since the header is 14 bytes, this makes the
* payload word-aligned.
*
* Instead of calling skb_reserve(NET_IP_ALIGN), we just copy
* the two padding bytes into the skb so that we avoid hitting
* the slowpath in memcpy(), and pull them off afterwards.
*/
skb = netdev_alloc_skb(bp->dev, len + NET_IP_ALIGN);
if (!skb) {
bp->stats.rx_dropped++;
for (frag = first_frag; ; frag++) {
desc = macb_rx_desc(bp, frag);
desc->addr &= ~MACB_BIT(RX_USED);
if (frag == last_frag)
break;
}
/* Make descriptor updates visible to hardware */
wmb();
return 1;
}
offset = 0;
len += NET_IP_ALIGN;
skb_checksum_none_assert(skb);
skb_put(skb, len);
for (frag = first_frag; ; frag++) {
unsigned int frag_len = bp->rx_buffer_size;
if (offset + frag_len > len) {
BUG_ON(frag != last_frag);
frag_len = len - offset;
}
skb_copy_to_linear_data_offset(skb, offset,
macb_rx_buffer(bp, frag), frag_len);
offset += bp->rx_buffer_size;
desc = macb_rx_desc(bp, frag);
desc->addr &= ~MACB_BIT(RX_USED);
if (frag == last_frag)
break;
}
/* Make descriptor updates visible to hardware */
wmb();
__skb_pull(skb, NET_IP_ALIGN);
skb->protocol = eth_type_trans(skb, bp->dev);
bp->stats.rx_packets++;
bp->stats.rx_bytes += skb->len;
netdev_vdbg(bp->dev, "received skb of length %u, csum: %08x\n",
skb->len, skb->csum);
netif_receive_skb(skb);
return 0;
}
static int macb_rx(struct macb *bp, int budget)
{
int received = 0;
unsigned int tail;
int first_frag = -1;
for (tail = bp->rx_tail; budget > 0; tail++) {
struct macb_dma_desc *desc = macb_rx_desc(bp, tail);
u32 addr, ctrl;
/* Make hw descriptor updates visible to CPU */
rmb();
addr = desc->addr;
ctrl = desc->ctrl;
if (!(addr & MACB_BIT(RX_USED)))
break;
if (ctrl & MACB_BIT(RX_SOF)) {
if (first_frag != -1)
discard_partial_frame(bp, first_frag, tail);
first_frag = tail;
}
if (ctrl & MACB_BIT(RX_EOF)) {
int dropped;
BUG_ON(first_frag == -1);
dropped = macb_rx_frame(bp, first_frag, tail);
first_frag = -1;
if (!dropped) {
received++;
budget--;
}
}
}
if (first_frag != -1)
bp->rx_tail = first_frag;
else
bp->rx_tail = tail;
return received;
}
static int macb_poll(struct napi_struct *napi, int budget)
{
struct macb *bp = container_of(napi, struct macb, napi);
int work_done;
u32 status;
status = macb_readl(bp, RSR);
macb_writel(bp, RSR, status);
work_done = 0;
netdev_vdbg(bp->dev, "poll: status = %08lx, budget = %d\n",
(unsigned long)status, budget);
work_done = bp->macbgem_ops.mog_rx(bp, budget);
if (work_done < budget) {
napi_complete(napi);
/* Packets received while interrupts were disabled */
status = macb_readl(bp, RSR);
if (status) {
if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
macb_writel(bp, ISR, MACB_BIT(RCOMP));
napi_reschedule(napi);
} else {
macb_writel(bp, IER, MACB_RX_INT_FLAGS);
}
}
/* TODO: Handle errors */
return work_done;
}
static irqreturn_t macb_interrupt(int irq, void *dev_id)
{
struct net_device *dev = dev_id;
struct macb *bp = netdev_priv(dev);
u32 status;
status = macb_readl(bp, ISR);
if (unlikely(!status))
return IRQ_NONE;
spin_lock(&bp->lock);
while (status) {
/* close possible race with dev_close */
if (unlikely(!netif_running(dev))) {
macb_writel(bp, IDR, -1);
break;
}
netdev_vdbg(bp->dev, "isr = 0x%08lx\n", (unsigned long)status);
if (status & MACB_RX_INT_FLAGS) {
/*
* There's no point taking any more interrupts
* until we have processed the buffers. The
* scheduling call may fail if the poll routine
* is already scheduled, so disable interrupts
* now.
*/
macb_writel(bp, IDR, MACB_RX_INT_FLAGS);
if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
macb_writel(bp, ISR, MACB_BIT(RCOMP));
if (napi_schedule_prep(&bp->napi)) {
netdev_vdbg(bp->dev, "scheduling RX softirq\n");
__napi_schedule(&bp->napi);
}
}
if (unlikely(status & (MACB_TX_ERR_FLAGS))) {
macb_writel(bp, IDR, MACB_TX_INT_FLAGS);
schedule_work(&bp->tx_error_task);
if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
macb_writel(bp, ISR, MACB_TX_ERR_FLAGS);
break;
}
if (status & MACB_BIT(TCOMP))
macb_tx_interrupt(bp);
/*
* Link change detection isn't possible with RMII, so we'll
* add that if/when we get our hands on a full-blown MII PHY.
*/
if (status & MACB_BIT(ISR_ROVR)) {
/* We missed at least one packet */
if (macb_is_gem(bp))
bp->hw_stats.gem.rx_overruns++;
else
bp->hw_stats.macb.rx_overruns++;
if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
macb_writel(bp, ISR, MACB_BIT(ISR_ROVR));
}
if (status & MACB_BIT(HRESP)) {
/*
* TODO: Reset the hardware, and maybe move the
* netdev_err to a lower-priority context as well
* (work queue?)
*/
netdev_err(dev, "DMA bus error: HRESP not OK\n");
if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
macb_writel(bp, ISR, MACB_BIT(HRESP));
}
status = macb_readl(bp, ISR);
}
spin_unlock(&bp->lock);
return IRQ_HANDLED;
}
#ifdef CONFIG_NET_POLL_CONTROLLER
/*
* Polling receive - used by netconsole and other diagnostic tools
* to allow network i/o with interrupts disabled.
*/
static void macb_poll_controller(struct net_device *dev)
{
unsigned long flags;
local_irq_save(flags);
macb_interrupt(dev->irq, dev);
local_irq_restore(flags);
}
#endif
static int macb_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct macb *bp = netdev_priv(dev);
dma_addr_t mapping;
unsigned int len, entry;
struct macb_dma_desc *desc;
struct macb_tx_skb *tx_skb;
u32 ctrl;
unsigned long flags;
#if defined(DEBUG) && defined(VERBOSE_DEBUG)
netdev_vdbg(bp->dev,
"start_xmit: len %u head %p data %p tail %p end %p\n",
skb->len, skb->head, skb->data,
skb_tail_pointer(skb), skb_end_pointer(skb));
print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_OFFSET, 16, 1,
skb->data, 16, true);
#endif
len = skb->len;
spin_lock_irqsave(&bp->lock, flags);
/* This is a hard error, log it. */
if (CIRC_SPACE(bp->tx_head, bp->tx_tail, TX_RING_SIZE) < 1) {
netif_stop_queue(dev);
spin_unlock_irqrestore(&bp->lock, flags);
netdev_err(bp->dev, "BUG! Tx Ring full when queue awake!\n");
netdev_dbg(bp->dev, "tx_head = %u, tx_tail = %u\n",
bp->tx_head, bp->tx_tail);
return NETDEV_TX_BUSY;
}
entry = macb_tx_ring_wrap(bp->tx_head);
netdev_vdbg(bp->dev, "Allocated ring entry %u\n", entry);
mapping = dma_map_single(&bp->pdev->dev, skb->data,
len, DMA_TO_DEVICE);
if (dma_mapping_error(&bp->pdev->dev, mapping)) {
dev_kfree_skb_any(skb);
goto unlock;
}
bp->tx_head++;
tx_skb = &bp->tx_skb[entry];
tx_skb->skb = skb;
tx_skb->mapping = mapping;
netdev_vdbg(bp->dev, "Mapped skb data %p to DMA addr %08lx\n",
skb->data, (unsigned long)mapping);
ctrl = MACB_BF(TX_FRMLEN, len);
ctrl |= MACB_BIT(TX_LAST);
if (entry == (TX_RING_SIZE - 1))
ctrl |= MACB_BIT(TX_WRAP);
desc = &bp->tx_ring[entry];
desc->addr = mapping;
desc->ctrl = ctrl;
/* Make newly initialized descriptor visible to hardware */
wmb();
skb_tx_timestamp(skb);
macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TSTART));
if (CIRC_SPACE(bp->tx_head, bp->tx_tail, TX_RING_SIZE) < 1)
netif_stop_queue(dev);
unlock:
spin_unlock_irqrestore(&bp->lock, flags);
return NETDEV_TX_OK;
}
static void macb_init_rx_buffer_size(struct macb *bp, size_t size)
{
if (!macb_is_gem(bp)) {
bp->rx_buffer_size = MACB_RX_BUFFER_SIZE;
} else {
bp->rx_buffer_size = size;
if (bp->rx_buffer_size % RX_BUFFER_MULTIPLE) {
netdev_dbg(bp->dev,
"RX buffer must be multiple of %d bytes, expanding\n",
RX_BUFFER_MULTIPLE);
bp->rx_buffer_size =
roundup(bp->rx_buffer_size, RX_BUFFER_MULTIPLE);
}
}
netdev_dbg(bp->dev, "mtu [%u] rx_buffer_size [%Zu]\n",
bp->dev->mtu, bp->rx_buffer_size);
}
static void gem_free_rx_buffers(struct macb *bp)
{
struct sk_buff *skb;
struct macb_dma_desc *desc;
dma_addr_t addr;
int i;
if (!bp->rx_skbuff)
return;
for (i = 0; i < RX_RING_SIZE; i++) {
skb = bp->rx_skbuff[i];
if (skb == NULL)
continue;
desc = &bp->rx_ring[i];
addr = MACB_BF(RX_WADDR, MACB_BFEXT(RX_WADDR, desc->addr));
dma_unmap_single(&bp->pdev->dev, addr, bp->rx_buffer_size,
DMA_FROM_DEVICE);
dev_kfree_skb_any(skb);
skb = NULL;
}
kfree(bp->rx_skbuff);
bp->rx_skbuff = NULL;
}
static void macb_free_rx_buffers(struct macb *bp)
{
if (bp->rx_buffers) {
dma_free_coherent(&bp->pdev->dev,
RX_RING_SIZE * bp->rx_buffer_size,
bp->rx_buffers, bp->rx_buffers_dma);
bp->rx_buffers = NULL;
}
}
static void macb_free_consistent(struct macb *bp)
{
if (bp->tx_skb) {
kfree(bp->tx_skb);
bp->tx_skb = NULL;
}
bp->macbgem_ops.mog_free_rx_buffers(bp);
if (bp->rx_ring) {
dma_free_coherent(&bp->pdev->dev, RX_RING_BYTES,
bp->rx_ring, bp->rx_ring_dma);
bp->rx_ring = NULL;
}
if (bp->tx_ring) {
dma_free_coherent(&bp->pdev->dev, TX_RING_BYTES,
bp->tx_ring, bp->tx_ring_dma);
bp->tx_ring = NULL;
}
}
static int gem_alloc_rx_buffers(struct macb *bp)
{
int size;
size = RX_RING_SIZE * sizeof(struct sk_buff *);
bp->rx_skbuff = kzalloc(size, GFP_KERNEL);
if (!bp->rx_skbuff)
return -ENOMEM;
else
netdev_dbg(bp->dev,
"Allocated %d RX struct sk_buff entries at %p\n",
RX_RING_SIZE, bp->rx_skbuff);
return 0;
}
static int macb_alloc_rx_buffers(struct macb *bp)
{
int size;
size = RX_RING_SIZE * bp->rx_buffer_size;
bp->rx_buffers = dma_alloc_coherent(&bp->pdev->dev, size,
&bp->rx_buffers_dma, GFP_KERNEL);
if (!bp->rx_buffers)
return -ENOMEM;
else
netdev_dbg(bp->dev,
"Allocated RX buffers of %d bytes at %08lx (mapped %p)\n",
size, (unsigned long)bp->rx_buffers_dma, bp->rx_buffers);
return 0;
}
static int macb_alloc_consistent(struct macb *bp)
{
int size;
size = TX_RING_SIZE * sizeof(struct macb_tx_skb);
bp->tx_skb = kmalloc(size, GFP_KERNEL);
if (!bp->tx_skb)
goto out_err;
size = RX_RING_BYTES;
bp->rx_ring = dma_alloc_coherent(&bp->pdev->dev, size,
&bp->rx_ring_dma, GFP_KERNEL);
if (!bp->rx_ring)
goto out_err;
netdev_dbg(bp->dev,
"Allocated RX ring of %d bytes at %08lx (mapped %p)\n",
size, (unsigned long)bp->rx_ring_dma, bp->rx_ring);
size = TX_RING_BYTES;
bp->tx_ring = dma_alloc_coherent(&bp->pdev->dev, size,
&bp->tx_ring_dma, GFP_KERNEL);
if (!bp->tx_ring)
goto out_err;
netdev_dbg(bp->dev,
"Allocated TX ring of %d bytes at %08lx (mapped %p)\n",
size, (unsigned long)bp->tx_ring_dma, bp->tx_ring);
if (bp->macbgem_ops.mog_alloc_rx_buffers(bp))
goto out_err;
return 0;
out_err:
macb_free_consistent(bp);
return -ENOMEM;
}
static void gem_init_rings(struct macb *bp)
{
int i;
for (i = 0; i < TX_RING_SIZE; i++) {
bp->tx_ring[i].addr = 0;
bp->tx_ring[i].ctrl = MACB_BIT(TX_USED);
}
bp->tx_ring[TX_RING_SIZE - 1].ctrl |= MACB_BIT(TX_WRAP);
bp->rx_tail = bp->rx_prepared_head = bp->tx_head = bp->tx_tail = 0;
gem_rx_refill(bp);
}
static void macb_init_rings(struct macb *bp)
{
int i;
dma_addr_t addr;
addr = bp->rx_buffers_dma;
for (i = 0; i < RX_RING_SIZE; i++) {
bp->rx_ring[i].addr = addr;
bp->rx_ring[i].ctrl = 0;
addr += bp->rx_buffer_size;
}
bp->rx_ring[RX_RING_SIZE - 1].addr |= MACB_BIT(RX_WRAP);
for (i = 0; i < TX_RING_SIZE; i++) {
bp->tx_ring[i].addr = 0;
bp->tx_ring[i].ctrl = MACB_BIT(TX_USED);
}
bp->tx_ring[TX_RING_SIZE - 1].ctrl |= MACB_BIT(TX_WRAP);
bp->rx_tail = bp->tx_head = bp->tx_tail = 0;
}
static void macb_reset_hw(struct macb *bp)
{
/*
* Disable RX and TX (XXX: Should we halt the transmission
* more gracefully?)
*/
macb_writel(bp, NCR, 0);
/* Clear the stats registers (XXX: Update stats first?) */
macb_writel(bp, NCR, MACB_BIT(CLRSTAT));
/* Clear all status flags */
macb_writel(bp, TSR, -1);
macb_writel(bp, RSR, -1);
/* Disable all interrupts */
macb_writel(bp, IDR, -1);
macb_readl(bp, ISR);
}
static u32 gem_mdc_clk_div(struct macb *bp)
{
u32 config;
unsigned long pclk_hz = clk_get_rate(bp->pclk);
if (pclk_hz <= 20000000)
config = GEM_BF(CLK, GEM_CLK_DIV8);
else if (pclk_hz <= 40000000)
config = GEM_BF(CLK, GEM_CLK_DIV16);
else if (pclk_hz <= 80000000)
config = GEM_BF(CLK, GEM_CLK_DIV32);
else if (pclk_hz <= 120000000)
config = GEM_BF(CLK, GEM_CLK_DIV48);
else if (pclk_hz <= 160000000)
config = GEM_BF(CLK, GEM_CLK_DIV64);
else
config = GEM_BF(CLK, GEM_CLK_DIV96);
return config;
}
static u32 macb_mdc_clk_div(struct macb *bp)
{
u32 config;
unsigned long pclk_hz;
if (macb_is_gem(bp))
return gem_mdc_clk_div(bp);
pclk_hz = clk_get_rate(bp->pclk);
if (pclk_hz <= 20000000)
config = MACB_BF(CLK, MACB_CLK_DIV8);
else if (pclk_hz <= 40000000)
config = MACB_BF(CLK, MACB_CLK_DIV16);
else if (pclk_hz <= 80000000)
config = MACB_BF(CLK, MACB_CLK_DIV32);
else
config = MACB_BF(CLK, MACB_CLK_DIV64);
return config;
}
/*
* Get the DMA bus width field of the network configuration register that we
* should program. We find the width from decoding the design configuration
* register to find the maximum supported data bus width.
*/
static u32 macb_dbw(struct macb *bp)
{
if (!macb_is_gem(bp))
return 0;
switch (GEM_BFEXT(DBWDEF, gem_readl(bp, DCFG1))) {
case 4:
return GEM_BF(DBW, GEM_DBW128);
case 2:
return GEM_BF(DBW, GEM_DBW64);
case 1:
default:
return GEM_BF(DBW, GEM_DBW32);
}
}
/*
* Configure the receive DMA engine
* - use the correct receive buffer size
* - set the possibility to use INCR16 bursts
* (if not supported by FIFO, it will fallback to default)
* - set both rx/tx packet buffers to full memory size
* These are configurable parameters for GEM.
*/
static void macb_configure_dma(struct macb *bp)
{
u32 dmacfg;
if (macb_is_gem(bp)) {
dmacfg = gem_readl(bp, DMACFG) & ~GEM_BF(RXBS, -1L);
dmacfg |= GEM_BF(RXBS, bp->rx_buffer_size / RX_BUFFER_MULTIPLE);
dmacfg |= GEM_BF(FBLDO, 16);
dmacfg |= GEM_BIT(TXPBMS) | GEM_BF(RXBMS, -1L);
dmacfg &= ~GEM_BIT(ENDIA);
gem_writel(bp, DMACFG, dmacfg);
}
}
/*
* Configure peripheral capacities according to integration options used
*/
static void macb_configure_caps(struct macb *bp)
{
if (macb_is_gem(bp)) {
if (GEM_BFEXT(IRQCOR, gem_readl(bp, DCFG1)) == 0)
bp->caps |= MACB_CAPS_ISR_CLEAR_ON_WRITE;
}
}
static void macb_init_hw(struct macb *bp)
{
u32 config;
macb_reset_hw(bp);
macb_set_hwaddr(bp);
config = macb_mdc_clk_div(bp);
config |= MACB_BF(RBOF, NET_IP_ALIGN); /* Make eth data aligned */
config |= MACB_BIT(PAE); /* PAuse Enable */
config |= MACB_BIT(DRFCS); /* Discard Rx FCS */
config |= MACB_BIT(BIG); /* Receive oversized frames */
if (bp->dev->flags & IFF_PROMISC)
config |= MACB_BIT(CAF); /* Copy All Frames */
if (!(bp->dev->flags & IFF_BROADCAST))
config |= MACB_BIT(NBC); /* No BroadCast */
config |= macb_dbw(bp);
macb_writel(bp, NCFGR, config);
bp->speed = SPEED_10;
bp->duplex = DUPLEX_HALF;
macb_configure_dma(bp);
macb_configure_caps(bp);
/* Initialize TX and RX buffers */
macb_writel(bp, RBQP, bp->rx_ring_dma);
macb_writel(bp, TBQP, bp->tx_ring_dma);
/* Enable TX and RX */
macb_writel(bp, NCR, MACB_BIT(RE) | MACB_BIT(TE) | MACB_BIT(MPE));
/* Enable interrupts */
macb_writel(bp, IER, (MACB_RX_INT_FLAGS
| MACB_TX_INT_FLAGS
| MACB_BIT(HRESP)));
}
/*
* The hash address register is 64 bits long and takes up two
* locations in the memory map. The least significant bits are stored
* in EMAC_HSL and the most significant bits in EMAC_HSH.
*
* The unicast hash enable and the multicast hash enable bits in the
* network configuration register enable the reception of hash matched
* frames. The destination address is reduced to a 6 bit index into
* the 64 bit hash register using the following hash function. The
* hash function is an exclusive or of every sixth bit of the
* destination address.
*
* hi[5] = da[5] ^ da[11] ^ da[17] ^ da[23] ^ da[29] ^ da[35] ^ da[41] ^ da[47]
* hi[4] = da[4] ^ da[10] ^ da[16] ^ da[22] ^ da[28] ^ da[34] ^ da[40] ^ da[46]
* hi[3] = da[3] ^ da[09] ^ da[15] ^ da[21] ^ da[27] ^ da[33] ^ da[39] ^ da[45]
* hi[2] = da[2] ^ da[08] ^ da[14] ^ da[20] ^ da[26] ^ da[32] ^ da[38] ^ da[44]
* hi[1] = da[1] ^ da[07] ^ da[13] ^ da[19] ^ da[25] ^ da[31] ^ da[37] ^ da[43]
* hi[0] = da[0] ^ da[06] ^ da[12] ^ da[18] ^ da[24] ^ da[30] ^ da[36] ^ da[42]
*
* da[0] represents the least significant bit of the first byte
* received, that is, the multicast/unicast indicator, and da[47]
* represents the most significant bit of the last byte received. If
* the hash index, hi[n], points to a bit that is set in the hash
* register then the frame will be matched according to whether the
* frame is multicast or unicast. A multicast match will be signalled
* if the multicast hash enable bit is set, da[0] is 1 and the hash
* index points to a bit set in the hash register. A unicast match
* will be signalled if the unicast hash enable bit is set, da[0] is 0
* and the hash index points to a bit set in the hash register. To
* receive all multicast frames, the hash register should be set with
* all ones and the multicast hash enable bit should be set in the
* network configuration register.
*/
static inline int hash_bit_value(int bitnr, __u8 *addr)
{
if (addr[bitnr / 8] & (1 << (bitnr % 8)))
return 1;
return 0;
}
/*
* Return the hash index value for the specified address.
*/
static int hash_get_index(__u8 *addr)
{
int i, j, bitval;
int hash_index = 0;
for (j = 0; j < 6; j++) {
for (i = 0, bitval = 0; i < 8; i++)
bitval ^= hash_bit_value(i*6 + j, addr);
hash_index |= (bitval << j);
}
return hash_index;
}
/*
* Add multicast addresses to the internal multicast-hash table.
*/
static void macb_sethashtable(struct net_device *dev)
{
struct netdev_hw_addr *ha;
unsigned long mc_filter[2];
unsigned int bitnr;
struct macb *bp = netdev_priv(dev);
mc_filter[0] = mc_filter[1] = 0;
netdev_for_each_mc_addr(ha, dev) {
bitnr = hash_get_index(ha->addr);
mc_filter[bitnr >> 5] |= 1 << (bitnr & 31);
}
macb_or_gem_writel(bp, HRB, mc_filter[0]);
macb_or_gem_writel(bp, HRT, mc_filter[1]);
}
/*
* Enable/Disable promiscuous and multicast modes.
*/
void macb_set_rx_mode(struct net_device *dev)
{
unsigned long cfg;
struct macb *bp = netdev_priv(dev);
cfg = macb_readl(bp, NCFGR);
if (dev->flags & IFF_PROMISC)
/* Enable promiscuous mode */
cfg |= MACB_BIT(CAF);
else if (dev->flags & (~IFF_PROMISC))
/* Disable promiscuous mode */
cfg &= ~MACB_BIT(CAF);
if (dev->flags & IFF_ALLMULTI) {
/* Enable all multicast mode */
macb_or_gem_writel(bp, HRB, -1);
macb_or_gem_writel(bp, HRT, -1);
cfg |= MACB_BIT(NCFGR_MTI);
} else if (!netdev_mc_empty(dev)) {
/* Enable specific multicasts */
macb_sethashtable(dev);
cfg |= MACB_BIT(NCFGR_MTI);
} else if (dev->flags & (~IFF_ALLMULTI)) {
/* Disable all multicast mode */
macb_or_gem_writel(bp, HRB, 0);
macb_or_gem_writel(bp, HRT, 0);
cfg &= ~MACB_BIT(NCFGR_MTI);
}
macb_writel(bp, NCFGR, cfg);
}
EXPORT_SYMBOL_GPL(macb_set_rx_mode);
static int macb_open(struct net_device *dev)
{
struct macb *bp = netdev_priv(dev);
size_t bufsz = dev->mtu + ETH_HLEN + ETH_FCS_LEN + NET_IP_ALIGN;
int err;
netdev_dbg(bp->dev, "open\n");
/* carrier starts down */
netif_carrier_off(dev);
/* if the phy is not yet register, retry later*/
if (!bp->phy_dev)
return -EAGAIN;
/* RX buffers initialization */
macb_init_rx_buffer_size(bp, bufsz);
err = macb_alloc_consistent(bp);
if (err) {
netdev_err(dev, "Unable to allocate DMA memory (error %d)\n",
err);
return err;
}
napi_enable(&bp->napi);
bp->macbgem_ops.mog_init_rings(bp);
macb_init_hw(bp);
/* schedule a link state check */
phy_start(bp->phy_dev);
netif_start_queue(dev);
return 0;
}
static int macb_close(struct net_device *dev)
{
struct macb *bp = netdev_priv(dev);
unsigned long flags;
netif_stop_queue(dev);
napi_disable(&bp->napi);
if (bp->phy_dev)
phy_stop(bp->phy_dev);
spin_lock_irqsave(&bp->lock, flags);
macb_reset_hw(bp);
netif_carrier_off(dev);
spin_unlock_irqrestore(&bp->lock, flags);
macb_free_consistent(bp);
return 0;
}
static void gem_update_stats(struct macb *bp)
{
u32 __iomem *reg = bp->regs + GEM_OTX;
u32 *p = &bp->hw_stats.gem.tx_octets_31_0;
u32 *end = &bp->hw_stats.gem.rx_udp_checksum_errors + 1;
for (; p < end; p++, reg++)
*p += __raw_readl(reg);
}
static struct net_device_stats *gem_get_stats(struct macb *bp)
{
struct gem_stats *hwstat = &bp->hw_stats.gem;
struct net_device_stats *nstat = &bp->stats;
gem_update_stats(bp);
nstat->rx_errors = (hwstat->rx_frame_check_sequence_errors +
hwstat->rx_alignment_errors +
hwstat->rx_resource_errors +
hwstat->rx_overruns +
hwstat->rx_oversize_frames +
hwstat->rx_jabbers +
hwstat->rx_undersized_frames +
hwstat->rx_length_field_frame_errors);
nstat->tx_errors = (hwstat->tx_late_collisions +
hwstat->tx_excessive_collisions +
hwstat->tx_underrun +
hwstat->tx_carrier_sense_errors);
nstat->multicast = hwstat->rx_multicast_frames;
nstat->collisions = (hwstat->tx_single_collision_frames +
hwstat->tx_multiple_collision_frames +
hwstat->tx_excessive_collisions);
nstat->rx_length_errors = (hwstat->rx_oversize_frames +
hwstat->rx_jabbers +
hwstat->rx_undersized_frames +
hwstat->rx_length_field_frame_errors);
nstat->rx_over_errors = hwstat->rx_resource_errors;
nstat->rx_crc_errors = hwstat->rx_frame_check_sequence_errors;
nstat->rx_frame_errors = hwstat->rx_alignment_errors;
nstat->rx_fifo_errors = hwstat->rx_overruns;
nstat->tx_aborted_errors = hwstat->tx_excessive_collisions;
nstat->tx_carrier_errors = hwstat->tx_carrier_sense_errors;
nstat->tx_fifo_errors = hwstat->tx_underrun;
return nstat;
}
struct net_device_stats *macb_get_stats(struct net_device *dev)
{
struct macb *bp = netdev_priv(dev);
struct net_device_stats *nstat = &bp->stats;
struct macb_stats *hwstat = &bp->hw_stats.macb;
if (macb_is_gem(bp))
return gem_get_stats(bp);
/* read stats from hardware */
macb_update_stats(bp);
/* Convert HW stats into netdevice stats */
nstat->rx_errors = (hwstat->rx_fcs_errors +
hwstat->rx_align_errors +
hwstat->rx_resource_errors +
hwstat->rx_overruns +
hwstat->rx_oversize_pkts +
hwstat->rx_jabbers +
hwstat->rx_undersize_pkts +
hwstat->sqe_test_errors +
hwstat->rx_length_mismatch);
nstat->tx_errors = (hwstat->tx_late_cols +
hwstat->tx_excessive_cols +
hwstat->tx_underruns +
hwstat->tx_carrier_errors);
nstat->collisions = (hwstat->tx_single_cols +
hwstat->tx_multiple_cols +
hwstat->tx_excessive_cols);
nstat->rx_length_errors = (hwstat->rx_oversize_pkts +
hwstat->rx_jabbers +
hwstat->rx_undersize_pkts +
hwstat->rx_length_mismatch);
nstat->rx_over_errors = hwstat->rx_resource_errors +
hwstat->rx_overruns;
nstat->rx_crc_errors = hwstat->rx_fcs_errors;
nstat->rx_frame_errors = hwstat->rx_align_errors;
nstat->rx_fifo_errors = hwstat->rx_overruns;
/* XXX: What does "missed" mean? */
nstat->tx_aborted_errors = hwstat->tx_excessive_cols;
nstat->tx_carrier_errors = hwstat->tx_carrier_errors;
nstat->tx_fifo_errors = hwstat->tx_underruns;
/* Don't know about heartbeat or window errors... */
return nstat;
}
EXPORT_SYMBOL_GPL(macb_get_stats);
static int macb_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
struct macb *bp = netdev_priv(dev);
struct phy_device *phydev = bp->phy_dev;
if (!phydev)
return -ENODEV;
return phy_ethtool_gset(phydev, cmd);
}
static int macb_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
struct macb *bp = netdev_priv(dev);
struct phy_device *phydev = bp->phy_dev;
if (!phydev)
return -ENODEV;
return phy_ethtool_sset(phydev, cmd);
}
static int macb_get_regs_len(struct net_device *netdev)
{
return MACB_GREGS_NBR * sizeof(u32);
}
static void macb_get_regs(struct net_device *dev, struct ethtool_regs *regs,
void *p)
{
struct macb *bp = netdev_priv(dev);
unsigned int tail, head;
u32 *regs_buff = p;
regs->version = (macb_readl(bp, MID) & ((1 << MACB_REV_SIZE) - 1))
| MACB_GREGS_VERSION;
tail = macb_tx_ring_wrap(bp->tx_tail);
head = macb_tx_ring_wrap(bp->tx_head);
regs_buff[0] = macb_readl(bp, NCR);
regs_buff[1] = macb_or_gem_readl(bp, NCFGR);
regs_buff[2] = macb_readl(bp, NSR);
regs_buff[3] = macb_readl(bp, TSR);
regs_buff[4] = macb_readl(bp, RBQP);
regs_buff[5] = macb_readl(bp, TBQP);
regs_buff[6] = macb_readl(bp, RSR);
regs_buff[7] = macb_readl(bp, IMR);
regs_buff[8] = tail;
regs_buff[9] = head;
regs_buff[10] = macb_tx_dma(bp, tail);
regs_buff[11] = macb_tx_dma(bp, head);
if (macb_is_gem(bp)) {
regs_buff[12] = gem_readl(bp, USRIO);
regs_buff[13] = gem_readl(bp, DMACFG);
}
}
const struct ethtool_ops macb_ethtool_ops = {
.get_settings = macb_get_settings,
.set_settings = macb_set_settings,
.get_regs_len = macb_get_regs_len,
.get_regs = macb_get_regs,
.get_link = ethtool_op_get_link,
.get_ts_info = ethtool_op_get_ts_info,
};
EXPORT_SYMBOL_GPL(macb_ethtool_ops);
int macb_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
struct macb *bp = netdev_priv(dev);
struct phy_device *phydev = bp->phy_dev;
if (!netif_running(dev))
return -EINVAL;
if (!phydev)
return -ENODEV;
return phy_mii_ioctl(phydev, rq, cmd);
}
EXPORT_SYMBOL_GPL(macb_ioctl);
static const struct net_device_ops macb_netdev_ops = {
.ndo_open = macb_open,
.ndo_stop = macb_close,
.ndo_start_xmit = macb_start_xmit,
.ndo_set_rx_mode = macb_set_rx_mode,
.ndo_get_stats = macb_get_stats,
.ndo_do_ioctl = macb_ioctl,
.ndo_validate_addr = eth_validate_addr,
.ndo_change_mtu = eth_change_mtu,
.ndo_set_mac_address = eth_mac_addr,
#ifdef CONFIG_NET_POLL_CONTROLLER
.ndo_poll_controller = macb_poll_controller,
#endif
};
#if defined(CONFIG_OF)
static const struct of_device_id macb_dt_ids[] = {
{ .compatible = "cdns,at32ap7000-macb" },
{ .compatible = "cdns,at91sam9260-macb" },
{ .compatible = "cdns,macb" },
{ .compatible = "cdns,pc302-gem" },
{ .compatible = "cdns,gem" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, macb_dt_ids);
#endif
static int __init macb_probe(struct platform_device *pdev)
{
struct macb_platform_data *pdata;
struct resource *regs;
struct net_device *dev;
struct macb *bp;
struct phy_device *phydev;
u32 config;
int err = -ENXIO;
struct pinctrl *pinctrl;
const char *mac;
regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!regs) {
dev_err(&pdev->dev, "no mmio resource defined\n");
goto err_out;
}
pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
if (IS_ERR(pinctrl)) {
err = PTR_ERR(pinctrl);
if (err == -EPROBE_DEFER)
goto err_out;
dev_warn(&pdev->dev, "No pinctrl provided\n");
}
err = -ENOMEM;
dev = alloc_etherdev(sizeof(*bp));
if (!dev)
goto err_out;
SET_NETDEV_DEV(dev, &pdev->dev);
/* TODO: Actually, we have some interesting features... */
dev->features |= 0;
bp = netdev_priv(dev);
bp->pdev = pdev;
bp->dev = dev;
spin_lock_init(&bp->lock);
INIT_WORK(&bp->tx_error_task, macb_tx_error_task);
bp->pclk = devm_clk_get(&pdev->dev, "pclk");
if (IS_ERR(bp->pclk)) {
err = PTR_ERR(bp->pclk);
dev_err(&pdev->dev, "failed to get macb_clk (%u)\n", err);
goto err_out_free_dev;
}
bp->hclk = devm_clk_get(&pdev->dev, "hclk");
if (IS_ERR(bp->hclk)) {
err = PTR_ERR(bp->hclk);
dev_err(&pdev->dev, "failed to get hclk (%u)\n", err);
goto err_out_free_dev;
}
bp->tx_clk = devm_clk_get(&pdev->dev, "tx_clk");
err = clk_prepare_enable(bp->pclk);
if (err) {
dev_err(&pdev->dev, "failed to enable pclk (%u)\n", err);
goto err_out_free_dev;
}
err = clk_prepare_enable(bp->hclk);
if (err) {
dev_err(&pdev->dev, "failed to enable hclk (%u)\n", err);
goto err_out_disable_pclk;
}
if (!IS_ERR(bp->tx_clk)) {
err = clk_prepare_enable(bp->tx_clk);
if (err) {
dev_err(&pdev->dev, "failed to enable tx_clk (%u)\n",
err);
goto err_out_disable_hclk;
}
}
bp->regs = devm_ioremap(&pdev->dev, regs->start, resource_size(regs));
if (!bp->regs) {
dev_err(&pdev->dev, "failed to map registers, aborting.\n");
err = -ENOMEM;
goto err_out_disable_clocks;
}
dev->irq = platform_get_irq(pdev, 0);
err = devm_request_irq(&pdev->dev, dev->irq, macb_interrupt, 0,
dev->name, dev);
if (err) {
dev_err(&pdev->dev, "Unable to request IRQ %d (error %d)\n",
dev->irq, err);
goto err_out_disable_clocks;
}
dev->netdev_ops = &macb_netdev_ops;
netif_napi_add(dev, &bp->napi, macb_poll, 64);
dev->ethtool_ops = &macb_ethtool_ops;
dev->base_addr = regs->start;
/* setup appropriated routines according to adapter type */
if (macb_is_gem(bp)) {
bp->macbgem_ops.mog_alloc_rx_buffers = gem_alloc_rx_buffers;
bp->macbgem_ops.mog_free_rx_buffers = gem_free_rx_buffers;
bp->macbgem_ops.mog_init_rings = gem_init_rings;
bp->macbgem_ops.mog_rx = gem_rx;
} else {
bp->macbgem_ops.mog_alloc_rx_buffers = macb_alloc_rx_buffers;
bp->macbgem_ops.mog_free_rx_buffers = macb_free_rx_buffers;
bp->macbgem_ops.mog_init_rings = macb_init_rings;
bp->macbgem_ops.mog_rx = macb_rx;
}
/* Set MII management clock divider */
config = macb_mdc_clk_div(bp);
config |= macb_dbw(bp);
macb_writel(bp, NCFGR, config);
mac = of_get_mac_address(pdev->dev.of_node);
if (mac)
memcpy(bp->dev->dev_addr, mac, ETH_ALEN);
else
macb_get_hwaddr(bp);
err = of_get_phy_mode(pdev->dev.of_node);
if (err < 0) {
pdata = dev_get_platdata(&pdev->dev);
if (pdata && pdata->is_rmii)
bp->phy_interface = PHY_INTERFACE_MODE_RMII;
else
bp->phy_interface = PHY_INTERFACE_MODE_MII;
} else {
bp->phy_interface = err;
}
if (bp->phy_interface == PHY_INTERFACE_MODE_RGMII)
macb_or_gem_writel(bp, USRIO, GEM_BIT(RGMII));
else if (bp->phy_interface == PHY_INTERFACE_MODE_RMII)
#if defined(CONFIG_ARCH_AT91)
macb_or_gem_writel(bp, USRIO, (MACB_BIT(RMII) |
MACB_BIT(CLKEN)));
#else
macb_or_gem_writel(bp, USRIO, 0);
#endif
else
#if defined(CONFIG_ARCH_AT91)
macb_or_gem_writel(bp, USRIO, MACB_BIT(CLKEN));
#else
macb_or_gem_writel(bp, USRIO, MACB_BIT(MII));
#endif
err = register_netdev(dev);
if (err) {
dev_err(&pdev->dev, "Cannot register net device, aborting.\n");
goto err_out_disable_clocks;
}
err = macb_mii_init(bp);
if (err)
goto err_out_unregister_netdev;
platform_set_drvdata(pdev, dev);
netif_carrier_off(dev);
netdev_info(dev, "Cadence %s at 0x%08lx irq %d (%pM)\n",
macb_is_gem(bp) ? "GEM" : "MACB", dev->base_addr,
dev->irq, dev->dev_addr);
phydev = bp->phy_dev;
netdev_info(dev, "attached PHY driver [%s] (mii_bus:phy_addr=%s, irq=%d)\n",
phydev->drv->name, dev_name(&phydev->dev), phydev->irq);
return 0;
err_out_unregister_netdev:
unregister_netdev(dev);
err_out_disable_clocks:
if (!IS_ERR(bp->tx_clk))
clk_disable_unprepare(bp->tx_clk);
err_out_disable_hclk:
clk_disable_unprepare(bp->hclk);
err_out_disable_pclk:
clk_disable_unprepare(bp->pclk);
err_out_free_dev:
free_netdev(dev);
err_out:
return err;
}
static int __exit macb_remove(struct platform_device *pdev)
{
struct net_device *dev;
struct macb *bp;
dev = platform_get_drvdata(pdev);
if (dev) {
bp = netdev_priv(dev);
if (bp->phy_dev)
phy_disconnect(bp->phy_dev);
mdiobus_unregister(bp->mii_bus);
kfree(bp->mii_bus->irq);
mdiobus_free(bp->mii_bus);
unregister_netdev(dev);
if (!IS_ERR(bp->tx_clk))
clk_disable_unprepare(bp->tx_clk);
clk_disable_unprepare(bp->hclk);
clk_disable_unprepare(bp->pclk);
free_netdev(dev);
}
return 0;
}
#ifdef CONFIG_PM
static int macb_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct net_device *netdev = platform_get_drvdata(pdev);
struct macb *bp = netdev_priv(netdev);
netif_carrier_off(netdev);
netif_device_detach(netdev);
if (!IS_ERR(bp->tx_clk))
clk_disable_unprepare(bp->tx_clk);
clk_disable_unprepare(bp->hclk);
clk_disable_unprepare(bp->pclk);
return 0;
}
static int macb_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct net_device *netdev = platform_get_drvdata(pdev);
struct macb *bp = netdev_priv(netdev);
clk_prepare_enable(bp->pclk);
clk_prepare_enable(bp->hclk);
if (!IS_ERR(bp->tx_clk))
clk_prepare_enable(bp->tx_clk);
netif_device_attach(netdev);
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(macb_pm_ops, macb_suspend, macb_resume);
static struct platform_driver macb_driver = {
.remove = __exit_p(macb_remove),
.driver = {
.name = "macb",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(macb_dt_ids),
.pm = &macb_pm_ops,
},
};
module_platform_driver_probe(macb_driver, macb_probe);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Cadence MACB/GEM Ethernet driver");
MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
MODULE_ALIAS("platform:macb");
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