// SPDX-License-Identifier: GPL-2.0-or-later
|
/*
|
* Aeroflex Gaisler GRETH 10/100/1G Ethernet MAC.
|
*
|
* 2005-2010 (c) Aeroflex Gaisler AB
|
*
|
* This driver supports GRETH 10/100 and GRETH 10/100/1G Ethernet MACs
|
* available in the GRLIB VHDL IP core library.
|
*
|
* Full documentation of both cores can be found here:
|
* https://www.gaisler.com/products/grlib/grip.pdf
|
*
|
* The Gigabit version supports scatter/gather DMA, any alignment of
|
* buffers and checksum offloading.
|
*
|
* Contributors: Kristoffer Glembo
|
* Daniel Hellstrom
|
* Marko Isomaki
|
*/
|
|
#include <linux/dma-mapping.h>
|
#include <linux/module.h>
|
#include <linux/uaccess.h>
|
#include <linux/interrupt.h>
|
#include <linux/netdevice.h>
|
#include <linux/etherdevice.h>
|
#include <linux/ethtool.h>
|
#include <linux/skbuff.h>
|
#include <linux/io.h>
|
#include <linux/crc32.h>
|
#include <linux/mii.h>
|
#include <linux/of_device.h>
|
#include <linux/of_net.h>
|
#include <linux/of_platform.h>
|
#include <linux/slab.h>
|
#include <asm/cacheflush.h>
|
#include <asm/byteorder.h>
|
|
#ifdef CONFIG_SPARC
|
#include <asm/idprom.h>
|
#endif
|
|
#include "greth.h"
|
|
#define GRETH_DEF_MSG_ENABLE \
|
(NETIF_MSG_DRV | \
|
NETIF_MSG_PROBE | \
|
NETIF_MSG_LINK | \
|
NETIF_MSG_IFDOWN | \
|
NETIF_MSG_IFUP | \
|
NETIF_MSG_RX_ERR | \
|
NETIF_MSG_TX_ERR)
|
|
static int greth_debug = -1; /* -1 == use GRETH_DEF_MSG_ENABLE as value */
|
module_param(greth_debug, int, 0);
|
MODULE_PARM_DESC(greth_debug, "GRETH bitmapped debugging message enable value");
|
|
/* Accept MAC address of the form macaddr=0x08,0x00,0x20,0x30,0x40,0x50 */
|
static int macaddr[6];
|
module_param_array(macaddr, int, NULL, 0);
|
MODULE_PARM_DESC(macaddr, "GRETH Ethernet MAC address");
|
|
static int greth_edcl = 1;
|
module_param(greth_edcl, int, 0);
|
MODULE_PARM_DESC(greth_edcl, "GRETH EDCL usage indicator. Set to 1 if EDCL is used.");
|
|
static int greth_open(struct net_device *dev);
|
static netdev_tx_t greth_start_xmit(struct sk_buff *skb,
|
struct net_device *dev);
|
static netdev_tx_t greth_start_xmit_gbit(struct sk_buff *skb,
|
struct net_device *dev);
|
static int greth_rx(struct net_device *dev, int limit);
|
static int greth_rx_gbit(struct net_device *dev, int limit);
|
static void greth_clean_tx(struct net_device *dev);
|
static void greth_clean_tx_gbit(struct net_device *dev);
|
static irqreturn_t greth_interrupt(int irq, void *dev_id);
|
static int greth_close(struct net_device *dev);
|
static int greth_set_mac_add(struct net_device *dev, void *p);
|
static void greth_set_multicast_list(struct net_device *dev);
|
|
#define GRETH_REGLOAD(a) (be32_to_cpu(__raw_readl(&(a))))
|
#define GRETH_REGSAVE(a, v) (__raw_writel(cpu_to_be32(v), &(a)))
|
#define GRETH_REGORIN(a, v) (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) | (v))))
|
#define GRETH_REGANDIN(a, v) (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) & (v))))
|
|
#define NEXT_TX(N) (((N) + 1) & GRETH_TXBD_NUM_MASK)
|
#define SKIP_TX(N, C) (((N) + C) & GRETH_TXBD_NUM_MASK)
|
#define NEXT_RX(N) (((N) + 1) & GRETH_RXBD_NUM_MASK)
|
|
static void greth_print_rx_packet(void *addr, int len)
|
{
|
print_hex_dump(KERN_DEBUG, "RX: ", DUMP_PREFIX_OFFSET, 16, 1,
|
addr, len, true);
|
}
|
|
static void greth_print_tx_packet(struct sk_buff *skb)
|
{
|
int i;
|
int length;
|
|
if (skb_shinfo(skb)->nr_frags == 0)
|
length = skb->len;
|
else
|
length = skb_headlen(skb);
|
|
print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
|
skb->data, length, true);
|
|
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
|
|
print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
|
skb_frag_address(&skb_shinfo(skb)->frags[i]),
|
skb_frag_size(&skb_shinfo(skb)->frags[i]), true);
|
}
|
}
|
|
static inline void greth_enable_tx(struct greth_private *greth)
|
{
|
wmb();
|
GRETH_REGORIN(greth->regs->control, GRETH_TXEN);
|
}
|
|
static inline void greth_enable_tx_and_irq(struct greth_private *greth)
|
{
|
wmb(); /* BDs must been written to memory before enabling TX */
|
GRETH_REGORIN(greth->regs->control, GRETH_TXEN | GRETH_TXI);
|
}
|
|
static inline void greth_disable_tx(struct greth_private *greth)
|
{
|
GRETH_REGANDIN(greth->regs->control, ~GRETH_TXEN);
|
}
|
|
static inline void greth_enable_rx(struct greth_private *greth)
|
{
|
wmb();
|
GRETH_REGORIN(greth->regs->control, GRETH_RXEN);
|
}
|
|
static inline void greth_disable_rx(struct greth_private *greth)
|
{
|
GRETH_REGANDIN(greth->regs->control, ~GRETH_RXEN);
|
}
|
|
static inline void greth_enable_irqs(struct greth_private *greth)
|
{
|
GRETH_REGORIN(greth->regs->control, GRETH_RXI | GRETH_TXI);
|
}
|
|
static inline void greth_disable_irqs(struct greth_private *greth)
|
{
|
GRETH_REGANDIN(greth->regs->control, ~(GRETH_RXI|GRETH_TXI));
|
}
|
|
static inline void greth_write_bd(u32 *bd, u32 val)
|
{
|
__raw_writel(cpu_to_be32(val), bd);
|
}
|
|
static inline u32 greth_read_bd(u32 *bd)
|
{
|
return be32_to_cpu(__raw_readl(bd));
|
}
|
|
static void greth_clean_rings(struct greth_private *greth)
|
{
|
int i;
|
struct greth_bd *rx_bdp = greth->rx_bd_base;
|
struct greth_bd *tx_bdp = greth->tx_bd_base;
|
|
if (greth->gbit_mac) {
|
|
/* Free and unmap RX buffers */
|
for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
|
if (greth->rx_skbuff[i] != NULL) {
|
dev_kfree_skb(greth->rx_skbuff[i]);
|
dma_unmap_single(greth->dev,
|
greth_read_bd(&rx_bdp->addr),
|
MAX_FRAME_SIZE+NET_IP_ALIGN,
|
DMA_FROM_DEVICE);
|
}
|
}
|
|
/* TX buffers */
|
while (greth->tx_free < GRETH_TXBD_NUM) {
|
|
struct sk_buff *skb = greth->tx_skbuff[greth->tx_last];
|
int nr_frags = skb_shinfo(skb)->nr_frags;
|
tx_bdp = greth->tx_bd_base + greth->tx_last;
|
greth->tx_last = NEXT_TX(greth->tx_last);
|
|
dma_unmap_single(greth->dev,
|
greth_read_bd(&tx_bdp->addr),
|
skb_headlen(skb),
|
DMA_TO_DEVICE);
|
|
for (i = 0; i < nr_frags; i++) {
|
skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
|
tx_bdp = greth->tx_bd_base + greth->tx_last;
|
|
dma_unmap_page(greth->dev,
|
greth_read_bd(&tx_bdp->addr),
|
skb_frag_size(frag),
|
DMA_TO_DEVICE);
|
|
greth->tx_last = NEXT_TX(greth->tx_last);
|
}
|
greth->tx_free += nr_frags+1;
|
dev_kfree_skb(skb);
|
}
|
|
|
} else { /* 10/100 Mbps MAC */
|
|
for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
|
kfree(greth->rx_bufs[i]);
|
dma_unmap_single(greth->dev,
|
greth_read_bd(&rx_bdp->addr),
|
MAX_FRAME_SIZE,
|
DMA_FROM_DEVICE);
|
}
|
for (i = 0; i < GRETH_TXBD_NUM; i++, tx_bdp++) {
|
kfree(greth->tx_bufs[i]);
|
dma_unmap_single(greth->dev,
|
greth_read_bd(&tx_bdp->addr),
|
MAX_FRAME_SIZE,
|
DMA_TO_DEVICE);
|
}
|
}
|
}
|
|
static int greth_init_rings(struct greth_private *greth)
|
{
|
struct sk_buff *skb;
|
struct greth_bd *rx_bd, *tx_bd;
|
u32 dma_addr;
|
int i;
|
|
rx_bd = greth->rx_bd_base;
|
tx_bd = greth->tx_bd_base;
|
|
/* Initialize descriptor rings and buffers */
|
if (greth->gbit_mac) {
|
|
for (i = 0; i < GRETH_RXBD_NUM; i++) {
|
skb = netdev_alloc_skb(greth->netdev, MAX_FRAME_SIZE+NET_IP_ALIGN);
|
if (skb == NULL) {
|
if (netif_msg_ifup(greth))
|
dev_err(greth->dev, "Error allocating DMA ring.\n");
|
goto cleanup;
|
}
|
skb_reserve(skb, NET_IP_ALIGN);
|
dma_addr = dma_map_single(greth->dev,
|
skb->data,
|
MAX_FRAME_SIZE+NET_IP_ALIGN,
|
DMA_FROM_DEVICE);
|
|
if (dma_mapping_error(greth->dev, dma_addr)) {
|
if (netif_msg_ifup(greth))
|
dev_err(greth->dev, "Could not create initial DMA mapping\n");
|
dev_kfree_skb(skb);
|
goto cleanup;
|
}
|
greth->rx_skbuff[i] = skb;
|
greth_write_bd(&rx_bd[i].addr, dma_addr);
|
greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
|
}
|
|
} else {
|
|
/* 10/100 MAC uses a fixed set of buffers and copy to/from SKBs */
|
for (i = 0; i < GRETH_RXBD_NUM; i++) {
|
|
greth->rx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
|
|
if (greth->rx_bufs[i] == NULL) {
|
if (netif_msg_ifup(greth))
|
dev_err(greth->dev, "Error allocating DMA ring.\n");
|
goto cleanup;
|
}
|
|
dma_addr = dma_map_single(greth->dev,
|
greth->rx_bufs[i],
|
MAX_FRAME_SIZE,
|
DMA_FROM_DEVICE);
|
|
if (dma_mapping_error(greth->dev, dma_addr)) {
|
if (netif_msg_ifup(greth))
|
dev_err(greth->dev, "Could not create initial DMA mapping\n");
|
goto cleanup;
|
}
|
greth_write_bd(&rx_bd[i].addr, dma_addr);
|
greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
|
}
|
for (i = 0; i < GRETH_TXBD_NUM; i++) {
|
|
greth->tx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
|
|
if (greth->tx_bufs[i] == NULL) {
|
if (netif_msg_ifup(greth))
|
dev_err(greth->dev, "Error allocating DMA ring.\n");
|
goto cleanup;
|
}
|
|
dma_addr = dma_map_single(greth->dev,
|
greth->tx_bufs[i],
|
MAX_FRAME_SIZE,
|
DMA_TO_DEVICE);
|
|
if (dma_mapping_error(greth->dev, dma_addr)) {
|
if (netif_msg_ifup(greth))
|
dev_err(greth->dev, "Could not create initial DMA mapping\n");
|
goto cleanup;
|
}
|
greth_write_bd(&tx_bd[i].addr, dma_addr);
|
greth_write_bd(&tx_bd[i].stat, 0);
|
}
|
}
|
greth_write_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat,
|
greth_read_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat) | GRETH_BD_WR);
|
|
/* Initialize pointers. */
|
greth->rx_cur = 0;
|
greth->tx_next = 0;
|
greth->tx_last = 0;
|
greth->tx_free = GRETH_TXBD_NUM;
|
|
/* Initialize descriptor base address */
|
GRETH_REGSAVE(greth->regs->tx_desc_p, greth->tx_bd_base_phys);
|
GRETH_REGSAVE(greth->regs->rx_desc_p, greth->rx_bd_base_phys);
|
|
return 0;
|
|
cleanup:
|
greth_clean_rings(greth);
|
return -ENOMEM;
|
}
|
|
static int greth_open(struct net_device *dev)
|
{
|
struct greth_private *greth = netdev_priv(dev);
|
int err;
|
|
err = greth_init_rings(greth);
|
if (err) {
|
if (netif_msg_ifup(greth))
|
dev_err(&dev->dev, "Could not allocate memory for DMA rings\n");
|
return err;
|
}
|
|
err = request_irq(greth->irq, greth_interrupt, 0, "eth", (void *) dev);
|
if (err) {
|
if (netif_msg_ifup(greth))
|
dev_err(&dev->dev, "Could not allocate interrupt %d\n", dev->irq);
|
greth_clean_rings(greth);
|
return err;
|
}
|
|
if (netif_msg_ifup(greth))
|
dev_dbg(&dev->dev, " starting queue\n");
|
netif_start_queue(dev);
|
|
GRETH_REGSAVE(greth->regs->status, 0xFF);
|
|
napi_enable(&greth->napi);
|
|
greth_enable_irqs(greth);
|
greth_enable_tx(greth);
|
greth_enable_rx(greth);
|
return 0;
|
|
}
|
|
static int greth_close(struct net_device *dev)
|
{
|
struct greth_private *greth = netdev_priv(dev);
|
|
napi_disable(&greth->napi);
|
|
greth_disable_irqs(greth);
|
greth_disable_tx(greth);
|
greth_disable_rx(greth);
|
|
netif_stop_queue(dev);
|
|
free_irq(greth->irq, (void *) dev);
|
|
greth_clean_rings(greth);
|
|
return 0;
|
}
|
|
static netdev_tx_t
|
greth_start_xmit(struct sk_buff *skb, struct net_device *dev)
|
{
|
struct greth_private *greth = netdev_priv(dev);
|
struct greth_bd *bdp;
|
int err = NETDEV_TX_OK;
|
u32 status, dma_addr, ctrl;
|
unsigned long flags;
|
|
/* Clean TX Ring */
|
greth_clean_tx(greth->netdev);
|
|
if (unlikely(greth->tx_free <= 0)) {
|
spin_lock_irqsave(&greth->devlock, flags);/*save from poll/irq*/
|
ctrl = GRETH_REGLOAD(greth->regs->control);
|
/* Enable TX IRQ only if not already in poll() routine */
|
if (ctrl & GRETH_RXI)
|
GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_TXI);
|
netif_stop_queue(dev);
|
spin_unlock_irqrestore(&greth->devlock, flags);
|
return NETDEV_TX_BUSY;
|
}
|
|
if (netif_msg_pktdata(greth))
|
greth_print_tx_packet(skb);
|
|
|
if (unlikely(skb->len > MAX_FRAME_SIZE)) {
|
dev->stats.tx_errors++;
|
goto out;
|
}
|
|
bdp = greth->tx_bd_base + greth->tx_next;
|
dma_addr = greth_read_bd(&bdp->addr);
|
|
memcpy((unsigned char *) phys_to_virt(dma_addr), skb->data, skb->len);
|
|
dma_sync_single_for_device(greth->dev, dma_addr, skb->len, DMA_TO_DEVICE);
|
|
status = GRETH_BD_EN | GRETH_BD_IE | (skb->len & GRETH_BD_LEN);
|
greth->tx_bufs_length[greth->tx_next] = skb->len & GRETH_BD_LEN;
|
|
/* Wrap around descriptor ring */
|
if (greth->tx_next == GRETH_TXBD_NUM_MASK) {
|
status |= GRETH_BD_WR;
|
}
|
|
greth->tx_next = NEXT_TX(greth->tx_next);
|
greth->tx_free--;
|
|
/* Write descriptor control word and enable transmission */
|
greth_write_bd(&bdp->stat, status);
|
spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/
|
greth_enable_tx(greth);
|
spin_unlock_irqrestore(&greth->devlock, flags);
|
|
out:
|
dev_kfree_skb(skb);
|
return err;
|
}
|
|
static inline u16 greth_num_free_bds(u16 tx_last, u16 tx_next)
|
{
|
if (tx_next < tx_last)
|
return (tx_last - tx_next) - 1;
|
else
|
return GRETH_TXBD_NUM - (tx_next - tx_last) - 1;
|
}
|
|
static netdev_tx_t
|
greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev)
|
{
|
struct greth_private *greth = netdev_priv(dev);
|
struct greth_bd *bdp;
|
u32 status, dma_addr;
|
int curr_tx, nr_frags, i, err = NETDEV_TX_OK;
|
unsigned long flags;
|
u16 tx_last;
|
|
nr_frags = skb_shinfo(skb)->nr_frags;
|
tx_last = greth->tx_last;
|
rmb(); /* tx_last is updated by the poll task */
|
|
if (greth_num_free_bds(tx_last, greth->tx_next) < nr_frags + 1) {
|
netif_stop_queue(dev);
|
err = NETDEV_TX_BUSY;
|
goto out;
|
}
|
|
if (netif_msg_pktdata(greth))
|
greth_print_tx_packet(skb);
|
|
if (unlikely(skb->len > MAX_FRAME_SIZE)) {
|
dev->stats.tx_errors++;
|
goto out;
|
}
|
|
/* Save skb pointer. */
|
greth->tx_skbuff[greth->tx_next] = skb;
|
|
/* Linear buf */
|
if (nr_frags != 0)
|
status = GRETH_TXBD_MORE;
|
else
|
status = GRETH_BD_IE;
|
|
if (skb->ip_summed == CHECKSUM_PARTIAL)
|
status |= GRETH_TXBD_CSALL;
|
status |= skb_headlen(skb) & GRETH_BD_LEN;
|
if (greth->tx_next == GRETH_TXBD_NUM_MASK)
|
status |= GRETH_BD_WR;
|
|
|
bdp = greth->tx_bd_base + greth->tx_next;
|
greth_write_bd(&bdp->stat, status);
|
dma_addr = dma_map_single(greth->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);
|
|
if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
|
goto map_error;
|
|
greth_write_bd(&bdp->addr, dma_addr);
|
|
curr_tx = NEXT_TX(greth->tx_next);
|
|
/* Frags */
|
for (i = 0; i < nr_frags; i++) {
|
skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
|
greth->tx_skbuff[curr_tx] = NULL;
|
bdp = greth->tx_bd_base + curr_tx;
|
|
status = GRETH_BD_EN;
|
if (skb->ip_summed == CHECKSUM_PARTIAL)
|
status |= GRETH_TXBD_CSALL;
|
status |= skb_frag_size(frag) & GRETH_BD_LEN;
|
|
/* Wrap around descriptor ring */
|
if (curr_tx == GRETH_TXBD_NUM_MASK)
|
status |= GRETH_BD_WR;
|
|
/* More fragments left */
|
if (i < nr_frags - 1)
|
status |= GRETH_TXBD_MORE;
|
else
|
status |= GRETH_BD_IE; /* enable IRQ on last fragment */
|
|
greth_write_bd(&bdp->stat, status);
|
|
dma_addr = skb_frag_dma_map(greth->dev, frag, 0, skb_frag_size(frag),
|
DMA_TO_DEVICE);
|
|
if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
|
goto frag_map_error;
|
|
greth_write_bd(&bdp->addr, dma_addr);
|
|
curr_tx = NEXT_TX(curr_tx);
|
}
|
|
wmb();
|
|
/* Enable the descriptor chain by enabling the first descriptor */
|
bdp = greth->tx_bd_base + greth->tx_next;
|
greth_write_bd(&bdp->stat,
|
greth_read_bd(&bdp->stat) | GRETH_BD_EN);
|
|
spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/
|
greth->tx_next = curr_tx;
|
greth_enable_tx_and_irq(greth);
|
spin_unlock_irqrestore(&greth->devlock, flags);
|
|
return NETDEV_TX_OK;
|
|
frag_map_error:
|
/* Unmap SKB mappings that succeeded and disable descriptor */
|
for (i = 0; greth->tx_next + i != curr_tx; i++) {
|
bdp = greth->tx_bd_base + greth->tx_next + i;
|
dma_unmap_single(greth->dev,
|
greth_read_bd(&bdp->addr),
|
greth_read_bd(&bdp->stat) & GRETH_BD_LEN,
|
DMA_TO_DEVICE);
|
greth_write_bd(&bdp->stat, 0);
|
}
|
map_error:
|
if (net_ratelimit())
|
dev_warn(greth->dev, "Could not create TX DMA mapping\n");
|
dev_kfree_skb(skb);
|
out:
|
return err;
|
}
|
|
static irqreturn_t greth_interrupt(int irq, void *dev_id)
|
{
|
struct net_device *dev = dev_id;
|
struct greth_private *greth;
|
u32 status, ctrl;
|
irqreturn_t retval = IRQ_NONE;
|
|
greth = netdev_priv(dev);
|
|
spin_lock(&greth->devlock);
|
|
/* Get the interrupt events that caused us to be here. */
|
status = GRETH_REGLOAD(greth->regs->status);
|
|
/* Must see if interrupts are enabled also, INT_TX|INT_RX flags may be
|
* set regardless of whether IRQ is enabled or not. Especially
|
* important when shared IRQ.
|
*/
|
ctrl = GRETH_REGLOAD(greth->regs->control);
|
|
/* Handle rx and tx interrupts through poll */
|
if (((status & (GRETH_INT_RE | GRETH_INT_RX)) && (ctrl & GRETH_RXI)) ||
|
((status & (GRETH_INT_TE | GRETH_INT_TX)) && (ctrl & GRETH_TXI))) {
|
retval = IRQ_HANDLED;
|
|
/* Disable interrupts and schedule poll() */
|
greth_disable_irqs(greth);
|
napi_schedule(&greth->napi);
|
}
|
|
spin_unlock(&greth->devlock);
|
|
return retval;
|
}
|
|
static void greth_clean_tx(struct net_device *dev)
|
{
|
struct greth_private *greth;
|
struct greth_bd *bdp;
|
u32 stat;
|
|
greth = netdev_priv(dev);
|
|
while (1) {
|
bdp = greth->tx_bd_base + greth->tx_last;
|
GRETH_REGSAVE(greth->regs->status, GRETH_INT_TE | GRETH_INT_TX);
|
mb();
|
stat = greth_read_bd(&bdp->stat);
|
|
if (unlikely(stat & GRETH_BD_EN))
|
break;
|
|
if (greth->tx_free == GRETH_TXBD_NUM)
|
break;
|
|
/* Check status for errors */
|
if (unlikely(stat & GRETH_TXBD_STATUS)) {
|
dev->stats.tx_errors++;
|
if (stat & GRETH_TXBD_ERR_AL)
|
dev->stats.tx_aborted_errors++;
|
if (stat & GRETH_TXBD_ERR_UE)
|
dev->stats.tx_fifo_errors++;
|
}
|
dev->stats.tx_packets++;
|
dev->stats.tx_bytes += greth->tx_bufs_length[greth->tx_last];
|
greth->tx_last = NEXT_TX(greth->tx_last);
|
greth->tx_free++;
|
}
|
|
if (greth->tx_free > 0) {
|
netif_wake_queue(dev);
|
}
|
}
|
|
static inline void greth_update_tx_stats(struct net_device *dev, u32 stat)
|
{
|
/* Check status for errors */
|
if (unlikely(stat & GRETH_TXBD_STATUS)) {
|
dev->stats.tx_errors++;
|
if (stat & GRETH_TXBD_ERR_AL)
|
dev->stats.tx_aborted_errors++;
|
if (stat & GRETH_TXBD_ERR_UE)
|
dev->stats.tx_fifo_errors++;
|
if (stat & GRETH_TXBD_ERR_LC)
|
dev->stats.tx_aborted_errors++;
|
}
|
dev->stats.tx_packets++;
|
}
|
|
static void greth_clean_tx_gbit(struct net_device *dev)
|
{
|
struct greth_private *greth;
|
struct greth_bd *bdp, *bdp_last_frag;
|
struct sk_buff *skb = NULL;
|
u32 stat;
|
int nr_frags, i;
|
u16 tx_last;
|
|
greth = netdev_priv(dev);
|
tx_last = greth->tx_last;
|
|
while (tx_last != greth->tx_next) {
|
|
skb = greth->tx_skbuff[tx_last];
|
|
nr_frags = skb_shinfo(skb)->nr_frags;
|
|
/* We only clean fully completed SKBs */
|
bdp_last_frag = greth->tx_bd_base + SKIP_TX(tx_last, nr_frags);
|
|
GRETH_REGSAVE(greth->regs->status, GRETH_INT_TE | GRETH_INT_TX);
|
mb();
|
stat = greth_read_bd(&bdp_last_frag->stat);
|
|
if (stat & GRETH_BD_EN)
|
break;
|
|
greth->tx_skbuff[tx_last] = NULL;
|
|
greth_update_tx_stats(dev, stat);
|
dev->stats.tx_bytes += skb->len;
|
|
bdp = greth->tx_bd_base + tx_last;
|
|
tx_last = NEXT_TX(tx_last);
|
|
dma_unmap_single(greth->dev,
|
greth_read_bd(&bdp->addr),
|
skb_headlen(skb),
|
DMA_TO_DEVICE);
|
|
for (i = 0; i < nr_frags; i++) {
|
skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
|
bdp = greth->tx_bd_base + tx_last;
|
|
dma_unmap_page(greth->dev,
|
greth_read_bd(&bdp->addr),
|
skb_frag_size(frag),
|
DMA_TO_DEVICE);
|
|
tx_last = NEXT_TX(tx_last);
|
}
|
dev_kfree_skb(skb);
|
}
|
if (skb) { /* skb is set only if the above while loop was entered */
|
wmb();
|
greth->tx_last = tx_last;
|
|
if (netif_queue_stopped(dev) &&
|
(greth_num_free_bds(tx_last, greth->tx_next) >
|
(MAX_SKB_FRAGS+1)))
|
netif_wake_queue(dev);
|
}
|
}
|
|
static int greth_rx(struct net_device *dev, int limit)
|
{
|
struct greth_private *greth;
|
struct greth_bd *bdp;
|
struct sk_buff *skb;
|
int pkt_len;
|
int bad, count;
|
u32 status, dma_addr;
|
unsigned long flags;
|
|
greth = netdev_priv(dev);
|
|
for (count = 0; count < limit; ++count) {
|
|
bdp = greth->rx_bd_base + greth->rx_cur;
|
GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX);
|
mb();
|
status = greth_read_bd(&bdp->stat);
|
|
if (unlikely(status & GRETH_BD_EN)) {
|
break;
|
}
|
|
dma_addr = greth_read_bd(&bdp->addr);
|
bad = 0;
|
|
/* Check status for errors. */
|
if (unlikely(status & GRETH_RXBD_STATUS)) {
|
if (status & GRETH_RXBD_ERR_FT) {
|
dev->stats.rx_length_errors++;
|
bad = 1;
|
}
|
if (status & (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE)) {
|
dev->stats.rx_frame_errors++;
|
bad = 1;
|
}
|
if (status & GRETH_RXBD_ERR_CRC) {
|
dev->stats.rx_crc_errors++;
|
bad = 1;
|
}
|
}
|
if (unlikely(bad)) {
|
dev->stats.rx_errors++;
|
|
} else {
|
|
pkt_len = status & GRETH_BD_LEN;
|
|
skb = netdev_alloc_skb(dev, pkt_len + NET_IP_ALIGN);
|
|
if (unlikely(skb == NULL)) {
|
|
if (net_ratelimit())
|
dev_warn(&dev->dev, "low on memory - " "packet dropped\n");
|
|
dev->stats.rx_dropped++;
|
|
} else {
|
skb_reserve(skb, NET_IP_ALIGN);
|
|
dma_sync_single_for_cpu(greth->dev,
|
dma_addr,
|
pkt_len,
|
DMA_FROM_DEVICE);
|
|
if (netif_msg_pktdata(greth))
|
greth_print_rx_packet(phys_to_virt(dma_addr), pkt_len);
|
|
skb_put_data(skb, phys_to_virt(dma_addr),
|
pkt_len);
|
|
skb->protocol = eth_type_trans(skb, dev);
|
dev->stats.rx_bytes += pkt_len;
|
dev->stats.rx_packets++;
|
netif_receive_skb(skb);
|
}
|
}
|
|
status = GRETH_BD_EN | GRETH_BD_IE;
|
if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
|
status |= GRETH_BD_WR;
|
}
|
|
wmb();
|
greth_write_bd(&bdp->stat, status);
|
|
dma_sync_single_for_device(greth->dev, dma_addr, MAX_FRAME_SIZE, DMA_FROM_DEVICE);
|
|
spin_lock_irqsave(&greth->devlock, flags); /* save from XMIT */
|
greth_enable_rx(greth);
|
spin_unlock_irqrestore(&greth->devlock, flags);
|
|
greth->rx_cur = NEXT_RX(greth->rx_cur);
|
}
|
|
return count;
|
}
|
|
static inline int hw_checksummed(u32 status)
|
{
|
|
if (status & GRETH_RXBD_IP_FRAG)
|
return 0;
|
|
if (status & GRETH_RXBD_IP && status & GRETH_RXBD_IP_CSERR)
|
return 0;
|
|
if (status & GRETH_RXBD_UDP && status & GRETH_RXBD_UDP_CSERR)
|
return 0;
|
|
if (status & GRETH_RXBD_TCP && status & GRETH_RXBD_TCP_CSERR)
|
return 0;
|
|
return 1;
|
}
|
|
static int greth_rx_gbit(struct net_device *dev, int limit)
|
{
|
struct greth_private *greth;
|
struct greth_bd *bdp;
|
struct sk_buff *skb, *newskb;
|
int pkt_len;
|
int bad, count = 0;
|
u32 status, dma_addr;
|
unsigned long flags;
|
|
greth = netdev_priv(dev);
|
|
for (count = 0; count < limit; ++count) {
|
|
bdp = greth->rx_bd_base + greth->rx_cur;
|
skb = greth->rx_skbuff[greth->rx_cur];
|
GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX);
|
mb();
|
status = greth_read_bd(&bdp->stat);
|
bad = 0;
|
|
if (status & GRETH_BD_EN)
|
break;
|
|
/* Check status for errors. */
|
if (unlikely(status & GRETH_RXBD_STATUS)) {
|
|
if (status & GRETH_RXBD_ERR_FT) {
|
dev->stats.rx_length_errors++;
|
bad = 1;
|
} else if (status &
|
(GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE | GRETH_RXBD_ERR_LE)) {
|
dev->stats.rx_frame_errors++;
|
bad = 1;
|
} else if (status & GRETH_RXBD_ERR_CRC) {
|
dev->stats.rx_crc_errors++;
|
bad = 1;
|
}
|
}
|
|
/* Allocate new skb to replace current, not needed if the
|
* current skb can be reused */
|
if (!bad && (newskb=netdev_alloc_skb(dev, MAX_FRAME_SIZE + NET_IP_ALIGN))) {
|
skb_reserve(newskb, NET_IP_ALIGN);
|
|
dma_addr = dma_map_single(greth->dev,
|
newskb->data,
|
MAX_FRAME_SIZE + NET_IP_ALIGN,
|
DMA_FROM_DEVICE);
|
|
if (!dma_mapping_error(greth->dev, dma_addr)) {
|
/* Process the incoming frame. */
|
pkt_len = status & GRETH_BD_LEN;
|
|
dma_unmap_single(greth->dev,
|
greth_read_bd(&bdp->addr),
|
MAX_FRAME_SIZE + NET_IP_ALIGN,
|
DMA_FROM_DEVICE);
|
|
if (netif_msg_pktdata(greth))
|
greth_print_rx_packet(phys_to_virt(greth_read_bd(&bdp->addr)), pkt_len);
|
|
skb_put(skb, pkt_len);
|
|
if (dev->features & NETIF_F_RXCSUM && hw_checksummed(status))
|
skb->ip_summed = CHECKSUM_UNNECESSARY;
|
else
|
skb_checksum_none_assert(skb);
|
|
skb->protocol = eth_type_trans(skb, dev);
|
dev->stats.rx_packets++;
|
dev->stats.rx_bytes += pkt_len;
|
netif_receive_skb(skb);
|
|
greth->rx_skbuff[greth->rx_cur] = newskb;
|
greth_write_bd(&bdp->addr, dma_addr);
|
} else {
|
if (net_ratelimit())
|
dev_warn(greth->dev, "Could not create DMA mapping, dropping packet\n");
|
dev_kfree_skb(newskb);
|
/* reusing current skb, so it is a drop */
|
dev->stats.rx_dropped++;
|
}
|
} else if (bad) {
|
/* Bad Frame transfer, the skb is reused */
|
dev->stats.rx_dropped++;
|
} else {
|
/* Failed Allocating a new skb. This is rather stupid
|
* but the current "filled" skb is reused, as if
|
* transfer failure. One could argue that RX descriptor
|
* table handling should be divided into cleaning and
|
* filling as the TX part of the driver
|
*/
|
if (net_ratelimit())
|
dev_warn(greth->dev, "Could not allocate SKB, dropping packet\n");
|
/* reusing current skb, so it is a drop */
|
dev->stats.rx_dropped++;
|
}
|
|
status = GRETH_BD_EN | GRETH_BD_IE;
|
if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
|
status |= GRETH_BD_WR;
|
}
|
|
wmb();
|
greth_write_bd(&bdp->stat, status);
|
spin_lock_irqsave(&greth->devlock, flags);
|
greth_enable_rx(greth);
|
spin_unlock_irqrestore(&greth->devlock, flags);
|
greth->rx_cur = NEXT_RX(greth->rx_cur);
|
}
|
|
return count;
|
|
}
|
|
static int greth_poll(struct napi_struct *napi, int budget)
|
{
|
struct greth_private *greth;
|
int work_done = 0;
|
unsigned long flags;
|
u32 mask, ctrl;
|
greth = container_of(napi, struct greth_private, napi);
|
|
restart_txrx_poll:
|
if (greth->gbit_mac) {
|
greth_clean_tx_gbit(greth->netdev);
|
work_done += greth_rx_gbit(greth->netdev, budget - work_done);
|
} else {
|
if (netif_queue_stopped(greth->netdev))
|
greth_clean_tx(greth->netdev);
|
work_done += greth_rx(greth->netdev, budget - work_done);
|
}
|
|
if (work_done < budget) {
|
|
spin_lock_irqsave(&greth->devlock, flags);
|
|
ctrl = GRETH_REGLOAD(greth->regs->control);
|
if ((greth->gbit_mac && (greth->tx_last != greth->tx_next)) ||
|
(!greth->gbit_mac && netif_queue_stopped(greth->netdev))) {
|
GRETH_REGSAVE(greth->regs->control,
|
ctrl | GRETH_TXI | GRETH_RXI);
|
mask = GRETH_INT_RX | GRETH_INT_RE |
|
GRETH_INT_TX | GRETH_INT_TE;
|
} else {
|
GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_RXI);
|
mask = GRETH_INT_RX | GRETH_INT_RE;
|
}
|
|
if (GRETH_REGLOAD(greth->regs->status) & mask) {
|
GRETH_REGSAVE(greth->regs->control, ctrl);
|
spin_unlock_irqrestore(&greth->devlock, flags);
|
goto restart_txrx_poll;
|
} else {
|
napi_complete_done(napi, work_done);
|
spin_unlock_irqrestore(&greth->devlock, flags);
|
}
|
}
|
|
return work_done;
|
}
|
|
static int greth_set_mac_add(struct net_device *dev, void *p)
|
{
|
struct sockaddr *addr = p;
|
struct greth_private *greth;
|
struct greth_regs *regs;
|
|
greth = netdev_priv(dev);
|
regs = greth->regs;
|
|
if (!is_valid_ether_addr(addr->sa_data))
|
return -EADDRNOTAVAIL;
|
|
memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
|
GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]);
|
GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 |
|
dev->dev_addr[4] << 8 | dev->dev_addr[5]);
|
|
return 0;
|
}
|
|
static u32 greth_hash_get_index(__u8 *addr)
|
{
|
return (ether_crc(6, addr)) & 0x3F;
|
}
|
|
static void greth_set_hash_filter(struct net_device *dev)
|
{
|
struct netdev_hw_addr *ha;
|
struct greth_private *greth = netdev_priv(dev);
|
struct greth_regs *regs = greth->regs;
|
u32 mc_filter[2];
|
unsigned int bitnr;
|
|
mc_filter[0] = mc_filter[1] = 0;
|
|
netdev_for_each_mc_addr(ha, dev) {
|
bitnr = greth_hash_get_index(ha->addr);
|
mc_filter[bitnr >> 5] |= 1 << (bitnr & 31);
|
}
|
|
GRETH_REGSAVE(regs->hash_msb, mc_filter[1]);
|
GRETH_REGSAVE(regs->hash_lsb, mc_filter[0]);
|
}
|
|
static void greth_set_multicast_list(struct net_device *dev)
|
{
|
int cfg;
|
struct greth_private *greth = netdev_priv(dev);
|
struct greth_regs *regs = greth->regs;
|
|
cfg = GRETH_REGLOAD(regs->control);
|
if (dev->flags & IFF_PROMISC)
|
cfg |= GRETH_CTRL_PR;
|
else
|
cfg &= ~GRETH_CTRL_PR;
|
|
if (greth->multicast) {
|
if (dev->flags & IFF_ALLMULTI) {
|
GRETH_REGSAVE(regs->hash_msb, -1);
|
GRETH_REGSAVE(regs->hash_lsb, -1);
|
cfg |= GRETH_CTRL_MCEN;
|
GRETH_REGSAVE(regs->control, cfg);
|
return;
|
}
|
|
if (netdev_mc_empty(dev)) {
|
cfg &= ~GRETH_CTRL_MCEN;
|
GRETH_REGSAVE(regs->control, cfg);
|
return;
|
}
|
|
/* Setup multicast filter */
|
greth_set_hash_filter(dev);
|
cfg |= GRETH_CTRL_MCEN;
|
}
|
GRETH_REGSAVE(regs->control, cfg);
|
}
|
|
static u32 greth_get_msglevel(struct net_device *dev)
|
{
|
struct greth_private *greth = netdev_priv(dev);
|
return greth->msg_enable;
|
}
|
|
static void greth_set_msglevel(struct net_device *dev, u32 value)
|
{
|
struct greth_private *greth = netdev_priv(dev);
|
greth->msg_enable = value;
|
}
|
|
static int greth_get_regs_len(struct net_device *dev)
|
{
|
return sizeof(struct greth_regs);
|
}
|
|
static void greth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
|
{
|
struct greth_private *greth = netdev_priv(dev);
|
|
strlcpy(info->driver, dev_driver_string(greth->dev),
|
sizeof(info->driver));
|
strlcpy(info->bus_info, greth->dev->bus->name, sizeof(info->bus_info));
|
}
|
|
static void greth_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *p)
|
{
|
int i;
|
struct greth_private *greth = netdev_priv(dev);
|
u32 __iomem *greth_regs = (u32 __iomem *) greth->regs;
|
u32 *buff = p;
|
|
for (i = 0; i < sizeof(struct greth_regs) / sizeof(u32); i++)
|
buff[i] = greth_read_bd(&greth_regs[i]);
|
}
|
|
static const struct ethtool_ops greth_ethtool_ops = {
|
.get_msglevel = greth_get_msglevel,
|
.set_msglevel = greth_set_msglevel,
|
.get_drvinfo = greth_get_drvinfo,
|
.get_regs_len = greth_get_regs_len,
|
.get_regs = greth_get_regs,
|
.get_link = ethtool_op_get_link,
|
.get_link_ksettings = phy_ethtool_get_link_ksettings,
|
.set_link_ksettings = phy_ethtool_set_link_ksettings,
|
};
|
|
static struct net_device_ops greth_netdev_ops = {
|
.ndo_open = greth_open,
|
.ndo_stop = greth_close,
|
.ndo_start_xmit = greth_start_xmit,
|
.ndo_set_mac_address = greth_set_mac_add,
|
.ndo_validate_addr = eth_validate_addr,
|
};
|
|
static inline int wait_for_mdio(struct greth_private *greth)
|
{
|
unsigned long timeout = jiffies + 4*HZ/100;
|
while (GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_BUSY) {
|
if (time_after(jiffies, timeout))
|
return 0;
|
}
|
return 1;
|
}
|
|
static int greth_mdio_read(struct mii_bus *bus, int phy, int reg)
|
{
|
struct greth_private *greth = bus->priv;
|
int data;
|
|
if (!wait_for_mdio(greth))
|
return -EBUSY;
|
|
GRETH_REGSAVE(greth->regs->mdio, ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 2);
|
|
if (!wait_for_mdio(greth))
|
return -EBUSY;
|
|
if (!(GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_NVALID)) {
|
data = (GRETH_REGLOAD(greth->regs->mdio) >> 16) & 0xFFFF;
|
return data;
|
|
} else {
|
return -1;
|
}
|
}
|
|
static int greth_mdio_write(struct mii_bus *bus, int phy, int reg, u16 val)
|
{
|
struct greth_private *greth = bus->priv;
|
|
if (!wait_for_mdio(greth))
|
return -EBUSY;
|
|
GRETH_REGSAVE(greth->regs->mdio,
|
((val & 0xFFFF) << 16) | ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 1);
|
|
if (!wait_for_mdio(greth))
|
return -EBUSY;
|
|
return 0;
|
}
|
|
static void greth_link_change(struct net_device *dev)
|
{
|
struct greth_private *greth = netdev_priv(dev);
|
struct phy_device *phydev = dev->phydev;
|
unsigned long flags;
|
int status_change = 0;
|
u32 ctrl;
|
|
spin_lock_irqsave(&greth->devlock, flags);
|
|
if (phydev->link) {
|
|
if ((greth->speed != phydev->speed) || (greth->duplex != phydev->duplex)) {
|
ctrl = GRETH_REGLOAD(greth->regs->control) &
|
~(GRETH_CTRL_FD | GRETH_CTRL_SP | GRETH_CTRL_GB);
|
|
if (phydev->duplex)
|
ctrl |= GRETH_CTRL_FD;
|
|
if (phydev->speed == SPEED_100)
|
ctrl |= GRETH_CTRL_SP;
|
else if (phydev->speed == SPEED_1000)
|
ctrl |= GRETH_CTRL_GB;
|
|
GRETH_REGSAVE(greth->regs->control, ctrl);
|
greth->speed = phydev->speed;
|
greth->duplex = phydev->duplex;
|
status_change = 1;
|
}
|
}
|
|
if (phydev->link != greth->link) {
|
if (!phydev->link) {
|
greth->speed = 0;
|
greth->duplex = -1;
|
}
|
greth->link = phydev->link;
|
|
status_change = 1;
|
}
|
|
spin_unlock_irqrestore(&greth->devlock, flags);
|
|
if (status_change) {
|
if (phydev->link)
|
pr_debug("%s: link up (%d/%s)\n",
|
dev->name, phydev->speed,
|
DUPLEX_FULL == phydev->duplex ? "Full" : "Half");
|
else
|
pr_debug("%s: link down\n", dev->name);
|
}
|
}
|
|
static int greth_mdio_probe(struct net_device *dev)
|
{
|
struct greth_private *greth = netdev_priv(dev);
|
struct phy_device *phy = NULL;
|
int ret;
|
|
/* Find the first PHY */
|
phy = phy_find_first(greth->mdio);
|
|
if (!phy) {
|
if (netif_msg_probe(greth))
|
dev_err(&dev->dev, "no PHY found\n");
|
return -ENXIO;
|
}
|
|
ret = phy_connect_direct(dev, phy, &greth_link_change,
|
greth->gbit_mac ? PHY_INTERFACE_MODE_GMII : PHY_INTERFACE_MODE_MII);
|
if (ret) {
|
if (netif_msg_ifup(greth))
|
dev_err(&dev->dev, "could not attach to PHY\n");
|
return ret;
|
}
|
|
if (greth->gbit_mac)
|
phy_set_max_speed(phy, SPEED_1000);
|
else
|
phy_set_max_speed(phy, SPEED_100);
|
|
linkmode_copy(phy->advertising, phy->supported);
|
|
greth->link = 0;
|
greth->speed = 0;
|
greth->duplex = -1;
|
|
return 0;
|
}
|
|
static int greth_mdio_init(struct greth_private *greth)
|
{
|
int ret;
|
unsigned long timeout;
|
struct net_device *ndev = greth->netdev;
|
|
greth->mdio = mdiobus_alloc();
|
if (!greth->mdio) {
|
return -ENOMEM;
|
}
|
|
greth->mdio->name = "greth-mdio";
|
snprintf(greth->mdio->id, MII_BUS_ID_SIZE, "%s-%d", greth->mdio->name, greth->irq);
|
greth->mdio->read = greth_mdio_read;
|
greth->mdio->write = greth_mdio_write;
|
greth->mdio->priv = greth;
|
|
ret = mdiobus_register(greth->mdio);
|
if (ret) {
|
goto error;
|
}
|
|
ret = greth_mdio_probe(greth->netdev);
|
if (ret) {
|
if (netif_msg_probe(greth))
|
dev_err(&greth->netdev->dev, "failed to probe MDIO bus\n");
|
goto unreg_mdio;
|
}
|
|
phy_start(ndev->phydev);
|
|
/* If Ethernet debug link is used make autoneg happen right away */
|
if (greth->edcl && greth_edcl == 1) {
|
phy_start_aneg(ndev->phydev);
|
timeout = jiffies + 6*HZ;
|
while (!phy_aneg_done(ndev->phydev) &&
|
time_before(jiffies, timeout)) {
|
}
|
phy_read_status(ndev->phydev);
|
greth_link_change(greth->netdev);
|
}
|
|
return 0;
|
|
unreg_mdio:
|
mdiobus_unregister(greth->mdio);
|
error:
|
mdiobus_free(greth->mdio);
|
return ret;
|
}
|
|
/* Initialize the GRETH MAC */
|
static int greth_of_probe(struct platform_device *ofdev)
|
{
|
struct net_device *dev;
|
struct greth_private *greth;
|
struct greth_regs *regs;
|
|
int i;
|
int err;
|
int tmp;
|
unsigned long timeout;
|
|
dev = alloc_etherdev(sizeof(struct greth_private));
|
|
if (dev == NULL)
|
return -ENOMEM;
|
|
greth = netdev_priv(dev);
|
greth->netdev = dev;
|
greth->dev = &ofdev->dev;
|
|
if (greth_debug > 0)
|
greth->msg_enable = greth_debug;
|
else
|
greth->msg_enable = GRETH_DEF_MSG_ENABLE;
|
|
spin_lock_init(&greth->devlock);
|
|
greth->regs = of_ioremap(&ofdev->resource[0], 0,
|
resource_size(&ofdev->resource[0]),
|
"grlib-greth regs");
|
|
if (greth->regs == NULL) {
|
if (netif_msg_probe(greth))
|
dev_err(greth->dev, "ioremap failure.\n");
|
err = -EIO;
|
goto error1;
|
}
|
|
regs = greth->regs;
|
greth->irq = ofdev->archdata.irqs[0];
|
|
dev_set_drvdata(greth->dev, dev);
|
SET_NETDEV_DEV(dev, greth->dev);
|
|
if (netif_msg_probe(greth))
|
dev_dbg(greth->dev, "resetting controller.\n");
|
|
/* Reset the controller. */
|
GRETH_REGSAVE(regs->control, GRETH_RESET);
|
|
/* Wait for MAC to reset itself */
|
timeout = jiffies + HZ/100;
|
while (GRETH_REGLOAD(regs->control) & GRETH_RESET) {
|
if (time_after(jiffies, timeout)) {
|
err = -EIO;
|
if (netif_msg_probe(greth))
|
dev_err(greth->dev, "timeout when waiting for reset.\n");
|
goto error2;
|
}
|
}
|
|
/* Get default PHY address */
|
greth->phyaddr = (GRETH_REGLOAD(regs->mdio) >> 11) & 0x1F;
|
|
/* Check if we have GBIT capable MAC */
|
tmp = GRETH_REGLOAD(regs->control);
|
greth->gbit_mac = (tmp >> 27) & 1;
|
|
/* Check for multicast capability */
|
greth->multicast = (tmp >> 25) & 1;
|
|
greth->edcl = (tmp >> 31) & 1;
|
|
/* If we have EDCL we disable the EDCL speed-duplex FSM so
|
* it doesn't interfere with the software */
|
if (greth->edcl != 0)
|
GRETH_REGORIN(regs->control, GRETH_CTRL_DISDUPLEX);
|
|
/* Check if MAC can handle MDIO interrupts */
|
greth->mdio_int_en = (tmp >> 26) & 1;
|
|
err = greth_mdio_init(greth);
|
if (err) {
|
if (netif_msg_probe(greth))
|
dev_err(greth->dev, "failed to register MDIO bus\n");
|
goto error2;
|
}
|
|
/* Allocate TX descriptor ring in coherent memory */
|
greth->tx_bd_base = dma_alloc_coherent(greth->dev, 1024,
|
&greth->tx_bd_base_phys,
|
GFP_KERNEL);
|
if (!greth->tx_bd_base) {
|
err = -ENOMEM;
|
goto error3;
|
}
|
|
/* Allocate RX descriptor ring in coherent memory */
|
greth->rx_bd_base = dma_alloc_coherent(greth->dev, 1024,
|
&greth->rx_bd_base_phys,
|
GFP_KERNEL);
|
if (!greth->rx_bd_base) {
|
err = -ENOMEM;
|
goto error4;
|
}
|
|
/* Get MAC address from: module param, OF property or ID prom */
|
for (i = 0; i < 6; i++) {
|
if (macaddr[i] != 0)
|
break;
|
}
|
if (i == 6) {
|
const u8 *addr;
|
|
addr = of_get_mac_address(ofdev->dev.of_node);
|
if (!IS_ERR(addr)) {
|
for (i = 0; i < 6; i++)
|
macaddr[i] = (unsigned int) addr[i];
|
} else {
|
#ifdef CONFIG_SPARC
|
for (i = 0; i < 6; i++)
|
macaddr[i] = (unsigned int) idprom->id_ethaddr[i];
|
#endif
|
}
|
}
|
|
for (i = 0; i < 6; i++)
|
dev->dev_addr[i] = macaddr[i];
|
|
macaddr[5]++;
|
|
if (!is_valid_ether_addr(&dev->dev_addr[0])) {
|
if (netif_msg_probe(greth))
|
dev_err(greth->dev, "no valid ethernet address, aborting.\n");
|
err = -EINVAL;
|
goto error5;
|
}
|
|
GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]);
|
GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 |
|
dev->dev_addr[4] << 8 | dev->dev_addr[5]);
|
|
/* Clear all pending interrupts except PHY irq */
|
GRETH_REGSAVE(regs->status, 0xFF);
|
|
if (greth->gbit_mac) {
|
dev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM |
|
NETIF_F_RXCSUM;
|
dev->features = dev->hw_features | NETIF_F_HIGHDMA;
|
greth_netdev_ops.ndo_start_xmit = greth_start_xmit_gbit;
|
}
|
|
if (greth->multicast) {
|
greth_netdev_ops.ndo_set_rx_mode = greth_set_multicast_list;
|
dev->flags |= IFF_MULTICAST;
|
} else {
|
dev->flags &= ~IFF_MULTICAST;
|
}
|
|
dev->netdev_ops = &greth_netdev_ops;
|
dev->ethtool_ops = &greth_ethtool_ops;
|
|
err = register_netdev(dev);
|
if (err) {
|
if (netif_msg_probe(greth))
|
dev_err(greth->dev, "netdevice registration failed.\n");
|
goto error5;
|
}
|
|
/* setup NAPI */
|
netif_napi_add(dev, &greth->napi, greth_poll, 64);
|
|
return 0;
|
|
error5:
|
dma_free_coherent(greth->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
|
error4:
|
dma_free_coherent(greth->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
|
error3:
|
mdiobus_unregister(greth->mdio);
|
error2:
|
of_iounmap(&ofdev->resource[0], greth->regs, resource_size(&ofdev->resource[0]));
|
error1:
|
free_netdev(dev);
|
return err;
|
}
|
|
static int greth_of_remove(struct platform_device *of_dev)
|
{
|
struct net_device *ndev = platform_get_drvdata(of_dev);
|
struct greth_private *greth = netdev_priv(ndev);
|
|
/* Free descriptor areas */
|
dma_free_coherent(&of_dev->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
|
|
dma_free_coherent(&of_dev->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
|
|
if (ndev->phydev)
|
phy_stop(ndev->phydev);
|
mdiobus_unregister(greth->mdio);
|
|
unregister_netdev(ndev);
|
|
of_iounmap(&of_dev->resource[0], greth->regs, resource_size(&of_dev->resource[0]));
|
|
free_netdev(ndev);
|
|
return 0;
|
}
|
|
static const struct of_device_id greth_of_match[] = {
|
{
|
.name = "GAISLER_ETHMAC",
|
},
|
{
|
.name = "01_01d",
|
},
|
{},
|
};
|
|
MODULE_DEVICE_TABLE(of, greth_of_match);
|
|
static struct platform_driver greth_of_driver = {
|
.driver = {
|
.name = "grlib-greth",
|
.of_match_table = greth_of_match,
|
},
|
.probe = greth_of_probe,
|
.remove = greth_of_remove,
|
};
|
|
module_platform_driver(greth_of_driver);
|
|
MODULE_AUTHOR("Aeroflex Gaisler AB.");
|
MODULE_DESCRIPTION("Aeroflex Gaisler Ethernet MAC driver");
|
MODULE_LICENSE("GPL");
|
