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linux/drivers/net/pasemi_mac.c

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/*
* Copyright (C) 2006-2007 PA Semi, Inc
*
* Driver for the PA Semi PWRficient onchip 1G/10G Ethernet MACs
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/dmaengine.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <asm/dma-mapping.h>
#include <linux/in.h>
#include <linux/skbuff.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <net/checksum.h>
#include <asm/irq.h>
#include "pasemi_mac.h"
/* TODO list
*
* - Get rid of pci_{read,write}_config(), map registers with ioremap
* for performance
* - PHY support
* - Multicast support
* - Large MTU support
* - Other performance improvements
*/
/* Must be a power of two */
#define RX_RING_SIZE 512
#define TX_RING_SIZE 512
#define DEFAULT_MSG_ENABLE \
(NETIF_MSG_DRV | \
NETIF_MSG_PROBE | \
NETIF_MSG_LINK | \
NETIF_MSG_TIMER | \
NETIF_MSG_IFDOWN | \
NETIF_MSG_IFUP | \
NETIF_MSG_RX_ERR | \
NETIF_MSG_TX_ERR)
#define TX_DESC(mac, num) ((mac)->tx->desc[(num) & (TX_RING_SIZE-1)])
#define TX_DESC_INFO(mac, num) ((mac)->tx->desc_info[(num) & (TX_RING_SIZE-1)])
#define RX_DESC(mac, num) ((mac)->rx->desc[(num) & (RX_RING_SIZE-1)])
#define RX_DESC_INFO(mac, num) ((mac)->rx->desc_info[(num) & (RX_RING_SIZE-1)])
#define RX_BUFF(mac, num) ((mac)->rx->buffers[(num) & (RX_RING_SIZE-1)])
#define RING_USED(ring) (((ring)->next_to_fill - (ring)->next_to_clean) \
& ((ring)->size - 1))
#define RING_AVAIL(ring) ((ring->size) - RING_USED(ring))
#define BUF_SIZE 1646 /* 1500 MTU + ETH_HLEN + VLAN_HLEN + 2 64B cachelines */
MODULE_LICENSE("GPL");
MODULE_AUTHOR ("Olof Johansson <olof@lixom.net>");
MODULE_DESCRIPTION("PA Semi PWRficient Ethernet driver");
static int debug = -1; /* -1 == use DEFAULT_MSG_ENABLE as value */
module_param(debug, int, 0);
MODULE_PARM_DESC(debug, "PA Semi MAC bitmapped debugging message enable value");
static struct pasdma_status *dma_status;
static unsigned int read_iob_reg(struct pasemi_mac *mac, unsigned int reg)
{
return in_le32(mac->iob_regs+reg);
}
static void write_iob_reg(struct pasemi_mac *mac, unsigned int reg,
unsigned int val)
{
out_le32(mac->iob_regs+reg, val);
}
static unsigned int read_mac_reg(struct pasemi_mac *mac, unsigned int reg)
{
return in_le32(mac->regs+reg);
}
static void write_mac_reg(struct pasemi_mac *mac, unsigned int reg,
unsigned int val)
{
out_le32(mac->regs+reg, val);
}
static unsigned int read_dma_reg(struct pasemi_mac *mac, unsigned int reg)
{
return in_le32(mac->dma_regs+reg);
}
static void write_dma_reg(struct pasemi_mac *mac, unsigned int reg,
unsigned int val)
{
out_le32(mac->dma_regs+reg, val);
}
static int pasemi_get_mac_addr(struct pasemi_mac *mac)
{
struct pci_dev *pdev = mac->pdev;
struct device_node *dn = pci_device_to_OF_node(pdev);
int len;
const u8 *maddr;
u8 addr[6];
if (!dn) {
dev_dbg(&pdev->dev,
"No device node for mac, not configuring\n");
return -ENOENT;
}
maddr = of_get_property(dn, "local-mac-address", &len);
if (maddr && len == 6) {
memcpy(mac->mac_addr, maddr, 6);
return 0;
}
/* Some old versions of firmware mistakenly uses mac-address
* (and as a string) instead of a byte array in local-mac-address.
*/
if (maddr == NULL)
maddr = of_get_property(dn, "mac-address", NULL);
if (maddr == NULL) {
dev_warn(&pdev->dev,
"no mac address in device tree, not configuring\n");
return -ENOENT;
}
if (sscanf(maddr, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", &addr[0],
&addr[1], &addr[2], &addr[3], &addr[4], &addr[5]) != 6) {
dev_warn(&pdev->dev,
"can't parse mac address, not configuring\n");
return -EINVAL;
}
memcpy(mac->mac_addr, addr, 6);
return 0;
}
static int pasemi_mac_setup_rx_resources(struct net_device *dev)
{
struct pasemi_mac_rxring *ring;
struct pasemi_mac *mac = netdev_priv(dev);
int chan_id = mac->dma_rxch;
ring = kzalloc(sizeof(*ring), GFP_KERNEL);
if (!ring)
goto out_ring;
spin_lock_init(&ring->lock);
ring->size = RX_RING_SIZE;
ring->desc_info = kzalloc(sizeof(struct pasemi_mac_buffer) *
RX_RING_SIZE, GFP_KERNEL);
if (!ring->desc_info)
goto out_desc_info;
/* Allocate descriptors */
ring->desc = dma_alloc_coherent(&mac->dma_pdev->dev,
RX_RING_SIZE *
sizeof(struct pas_dma_xct_descr),
&ring->dma, GFP_KERNEL);
if (!ring->desc)
goto out_desc;
memset(ring->desc, 0, RX_RING_SIZE * sizeof(struct pas_dma_xct_descr));
ring->buffers = dma_alloc_coherent(&mac->dma_pdev->dev,
RX_RING_SIZE * sizeof(u64),
&ring->buf_dma, GFP_KERNEL);
if (!ring->buffers)
goto out_buffers;
memset(ring->buffers, 0, RX_RING_SIZE * sizeof(u64));
write_dma_reg(mac, PAS_DMA_RXCHAN_BASEL(chan_id), PAS_DMA_RXCHAN_BASEL_BRBL(ring->dma));
write_dma_reg(mac, PAS_DMA_RXCHAN_BASEU(chan_id),
PAS_DMA_RXCHAN_BASEU_BRBH(ring->dma >> 32) |
PAS_DMA_RXCHAN_BASEU_SIZ(RX_RING_SIZE >> 2));
write_dma_reg(mac, PAS_DMA_RXCHAN_CFG(chan_id),
PAS_DMA_RXCHAN_CFG_HBU(2));
write_dma_reg(mac, PAS_DMA_RXINT_BASEL(mac->dma_if),
PAS_DMA_RXINT_BASEL_BRBL(__pa(ring->buffers)));
write_dma_reg(mac, PAS_DMA_RXINT_BASEU(mac->dma_if),
PAS_DMA_RXINT_BASEU_BRBH(__pa(ring->buffers) >> 32) |
PAS_DMA_RXINT_BASEU_SIZ(RX_RING_SIZE >> 3));
write_dma_reg(mac, PAS_DMA_RXINT_CFG(mac->dma_if),
PAS_DMA_RXINT_CFG_DHL(2));
ring->next_to_fill = 0;
ring->next_to_clean = 0;
snprintf(ring->irq_name, sizeof(ring->irq_name),
"%s rx", dev->name);
mac->rx = ring;
return 0;
out_buffers:
dma_free_coherent(&mac->dma_pdev->dev,
RX_RING_SIZE * sizeof(struct pas_dma_xct_descr),
mac->rx->desc, mac->rx->dma);
out_desc:
kfree(ring->desc_info);
out_desc_info:
kfree(ring);
out_ring:
return -ENOMEM;
}
static int pasemi_mac_setup_tx_resources(struct net_device *dev)
{
struct pasemi_mac *mac = netdev_priv(dev);
u32 val;
int chan_id = mac->dma_txch;
struct pasemi_mac_txring *ring;
ring = kzalloc(sizeof(*ring), GFP_KERNEL);
if (!ring)
goto out_ring;
spin_lock_init(&ring->lock);
ring->size = TX_RING_SIZE;
ring->desc_info = kzalloc(sizeof(struct pasemi_mac_buffer) *
TX_RING_SIZE, GFP_KERNEL);
if (!ring->desc_info)
goto out_desc_info;
/* Allocate descriptors */
ring->desc = dma_alloc_coherent(&mac->dma_pdev->dev,
TX_RING_SIZE *
sizeof(struct pas_dma_xct_descr),
&ring->dma, GFP_KERNEL);
if (!ring->desc)
goto out_desc;
memset(ring->desc, 0, TX_RING_SIZE * sizeof(struct pas_dma_xct_descr));
write_dma_reg(mac, PAS_DMA_TXCHAN_BASEL(chan_id),
PAS_DMA_TXCHAN_BASEL_BRBL(ring->dma));
val = PAS_DMA_TXCHAN_BASEU_BRBH(ring->dma >> 32);
val |= PAS_DMA_TXCHAN_BASEU_SIZ(TX_RING_SIZE >> 2);
write_dma_reg(mac, PAS_DMA_TXCHAN_BASEU(chan_id), val);
write_dma_reg(mac, PAS_DMA_TXCHAN_CFG(chan_id),
PAS_DMA_TXCHAN_CFG_TY_IFACE |
PAS_DMA_TXCHAN_CFG_TATTR(mac->dma_if) |
PAS_DMA_TXCHAN_CFG_UP |
PAS_DMA_TXCHAN_CFG_WT(2));
ring->next_to_fill = 0;
ring->next_to_clean = 0;
snprintf(ring->irq_name, sizeof(ring->irq_name),
"%s tx", dev->name);
mac->tx = ring;
return 0;
out_desc:
kfree(ring->desc_info);
out_desc_info:
kfree(ring);
out_ring:
return -ENOMEM;
}
static void pasemi_mac_free_tx_resources(struct net_device *dev)
{
struct pasemi_mac *mac = netdev_priv(dev);
unsigned int i;
struct pasemi_mac_buffer *info;
struct pas_dma_xct_descr *dp;
for (i = 0; i < TX_RING_SIZE; i++) {
info = &TX_DESC_INFO(mac, i);
dp = &TX_DESC(mac, i);
if (info->dma) {
if (info->skb) {
pci_unmap_single(mac->dma_pdev,
info->dma,
info->skb->len,
PCI_DMA_TODEVICE);
dev_kfree_skb_any(info->skb);
}
info->dma = 0;
info->skb = NULL;
dp->mactx = 0;
dp->ptr = 0;
}
}
dma_free_coherent(&mac->dma_pdev->dev,
TX_RING_SIZE * sizeof(struct pas_dma_xct_descr),
mac->tx->desc, mac->tx->dma);
kfree(mac->tx->desc_info);
kfree(mac->tx);
mac->tx = NULL;
}
static void pasemi_mac_free_rx_resources(struct net_device *dev)
{
struct pasemi_mac *mac = netdev_priv(dev);
unsigned int i;
struct pasemi_mac_buffer *info;
struct pas_dma_xct_descr *dp;
for (i = 0; i < RX_RING_SIZE; i++) {
info = &RX_DESC_INFO(mac, i);
dp = &RX_DESC(mac, i);
if (info->skb) {
if (info->dma) {
pci_unmap_single(mac->dma_pdev,
info->dma,
info->skb->len,
PCI_DMA_FROMDEVICE);
dev_kfree_skb_any(info->skb);
}
info->dma = 0;
info->skb = NULL;
dp->macrx = 0;
dp->ptr = 0;
}
}
dma_free_coherent(&mac->dma_pdev->dev,
RX_RING_SIZE * sizeof(struct pas_dma_xct_descr),
mac->rx->desc, mac->rx->dma);
dma_free_coherent(&mac->dma_pdev->dev, RX_RING_SIZE * sizeof(u64),
mac->rx->buffers, mac->rx->buf_dma);
kfree(mac->rx->desc_info);
kfree(mac->rx);
mac->rx = NULL;
}
static void pasemi_mac_replenish_rx_ring(struct net_device *dev)
{
struct pasemi_mac *mac = netdev_priv(dev);
unsigned int i;
int start = mac->rx->next_to_fill;
unsigned int limit, count;
limit = RING_AVAIL(mac->rx);
/* Check to see if we're doing first-time setup */
if (unlikely(mac->rx->next_to_clean == 0 && mac->rx->next_to_fill == 0))
limit = RX_RING_SIZE;
if (limit <= 0)
return;
i = start;
for (count = limit; count; count--) {
struct pasemi_mac_buffer *info = &RX_DESC_INFO(mac, i);
u64 *buff = &RX_BUFF(mac, i);
struct sk_buff *skb;
dma_addr_t dma;
/* skb might still be in there for recycle on short receives */
if (info->skb)
skb = info->skb;
else
skb = dev_alloc_skb(BUF_SIZE);
if (unlikely(!skb))
break;
dma = pci_map_single(mac->dma_pdev, skb->data, skb->len,
PCI_DMA_FROMDEVICE);
if (unlikely(dma_mapping_error(dma))) {
dev_kfree_skb_irq(info->skb);
break;
}
info->skb = skb;
info->dma = dma;
*buff = XCT_RXB_LEN(BUF_SIZE) | XCT_RXB_ADDR(dma);
i++;
}
wmb();
write_dma_reg(mac, PAS_DMA_RXCHAN_INCR(mac->dma_rxch), limit - count);
write_dma_reg(mac, PAS_DMA_RXINT_INCR(mac->dma_if), limit - count);
mac->rx->next_to_fill += limit - count;
}
static void pasemi_mac_restart_rx_intr(struct pasemi_mac *mac)
{
unsigned int reg, pcnt;
/* Re-enable packet count interrupts: finally
* ack the packet count interrupt we got in rx_intr.
*/
pcnt = *mac->rx_status & PAS_STATUS_PCNT_M;
reg = PAS_IOB_DMA_RXCH_RESET_PCNT(pcnt) | PAS_IOB_DMA_RXCH_RESET_PINTC;
write_iob_reg(mac, PAS_IOB_DMA_RXCH_RESET(mac->dma_rxch), reg);
}
static void pasemi_mac_restart_tx_intr(struct pasemi_mac *mac)
{
unsigned int reg, pcnt;
/* Re-enable packet count interrupts */
pcnt = *mac->tx_status & PAS_STATUS_PCNT_M;
reg = PAS_IOB_DMA_TXCH_RESET_PCNT(pcnt) | PAS_IOB_DMA_TXCH_RESET_PINTC;
write_iob_reg(mac, PAS_IOB_DMA_TXCH_RESET(mac->dma_txch), reg);
}
static int pasemi_mac_clean_rx(struct pasemi_mac *mac, int limit)
{
unsigned int n;
int count;
struct pas_dma_xct_descr *dp;
struct pasemi_mac_buffer *info;
struct sk_buff *skb;
unsigned int i, len;
u64 macrx;
dma_addr_t dma;
spin_lock(&mac->rx->lock);
n = mac->rx->next_to_clean;
for (count = limit; count; count--) {
rmb();
dp = &RX_DESC(mac, n);
prefetchw(dp);
macrx = dp->macrx;
if (!(macrx & XCT_MACRX_O))
break;
info = NULL;
/* We have to scan for our skb since there's no way
* to back-map them from the descriptor, and if we
* have several receive channels then they might not
* show up in the same order as they were put on the
* interface ring.
*/
dma = (dp->ptr & XCT_PTR_ADDR_M);
for (i = n; i < (n + RX_RING_SIZE); i++) {
info = &RX_DESC_INFO(mac, i);
if (info->dma == dma)
break;
}
prefetchw(info);
skb = info->skb;
prefetchw(skb);
info->dma = 0;
pci_unmap_single(mac->dma_pdev, dma, skb->len,
PCI_DMA_FROMDEVICE);
len = (macrx & XCT_MACRX_LLEN_M) >> XCT_MACRX_LLEN_S;
if (len < 256) {
struct sk_buff *new_skb =
netdev_alloc_skb(mac->netdev, len + NET_IP_ALIGN);
if (new_skb) {
skb_reserve(new_skb, NET_IP_ALIGN);
memcpy(new_skb->data, skb->data, len);
/* save the skb in buffer_info as good */
skb = new_skb;
}
/* else just continue with the old one */
} else
info->skb = NULL;
skb_put(skb, len);
if (likely((macrx & XCT_MACRX_HTY_M) == XCT_MACRX_HTY_IPV4_OK)) {
skb->ip_summed = CHECKSUM_UNNECESSARY;
skb->csum = (macrx & XCT_MACRX_CSUM_M) >>
XCT_MACRX_CSUM_S;
} else
skb->ip_summed = CHECKSUM_NONE;
mac->netdev->stats.rx_bytes += len;
mac->netdev->stats.rx_packets++;
skb->protocol = eth_type_trans(skb, mac->netdev);
netif_receive_skb(skb);
dp->ptr = 0;
dp->macrx = 0;
n++;
}
mac->rx->next_to_clean += limit - count;
pasemi_mac_replenish_rx_ring(mac->netdev);
spin_unlock(&mac->rx->lock);
return count;
}
static int pasemi_mac_clean_tx(struct pasemi_mac *mac)
{
int i;
struct pasemi_mac_buffer *info;
struct pas_dma_xct_descr *dp;
unsigned int start, count, limit;
unsigned int total_count;
int flags;
struct sk_buff *skbs[32];
dma_addr_t dmas[32];
total_count = 0;
restart:
spin_lock_irqsave(&mac->tx->lock, flags);
start = mac->tx->next_to_clean;
limit = min(mac->tx->next_to_fill, start+32);
count = 0;
for (i = start; i < limit; i++) {
dp = &TX_DESC(mac, i);
if (unlikely(dp->mactx & XCT_MACTX_O))
/* Not yet transmitted */
break;
info = &TX_DESC_INFO(mac, i);
skbs[count] = info->skb;
dmas[count] = info->dma;
info->skb = NULL;
info->dma = 0;
dp->mactx = 0;
dp->ptr = 0;
count++;
}
mac->tx->next_to_clean += count;
spin_unlock_irqrestore(&mac->tx->lock, flags);
netif_wake_queue(mac->netdev);
for (i = 0; i < count; i++) {
pci_unmap_single(mac->dma_pdev, dmas[i],
skbs[i]->len, PCI_DMA_TODEVICE);
dev_kfree_skb_irq(skbs[i]);
}
total_count += count;
/* If the batch was full, try to clean more */
if (count == 32)
goto restart;
return total_count;
}
static irqreturn_t pasemi_mac_rx_intr(int irq, void *data)
{
struct net_device *dev = data;
struct pasemi_mac *mac = netdev_priv(dev);
unsigned int reg;
if (!(*mac->rx_status & PAS_STATUS_CAUSE_M))
return IRQ_NONE;
if (*mac->rx_status & PAS_STATUS_ERROR)
printk("rx_status reported error\n");
/* Don't reset packet count so it won't fire again but clear
* all others.
*/
reg = 0;
if (*mac->rx_status & PAS_STATUS_SOFT)
reg |= PAS_IOB_DMA_RXCH_RESET_SINTC;
if (*mac->rx_status & PAS_STATUS_ERROR)
reg |= PAS_IOB_DMA_RXCH_RESET_DINTC;
if (*mac->rx_status & PAS_STATUS_TIMER)
reg |= PAS_IOB_DMA_RXCH_RESET_TINTC;
netif_rx_schedule(dev, &mac->napi);
write_iob_reg(mac, PAS_IOB_DMA_RXCH_RESET(mac->dma_rxch), reg);
return IRQ_HANDLED;
}
static irqreturn_t pasemi_mac_tx_intr(int irq, void *data)
{
struct net_device *dev = data;
struct pasemi_mac *mac = netdev_priv(dev);
unsigned int reg, pcnt;
if (!(*mac->tx_status & PAS_STATUS_CAUSE_M))
return IRQ_NONE;
pasemi_mac_clean_tx(mac);
pcnt = *mac->tx_status & PAS_STATUS_PCNT_M;
reg = PAS_IOB_DMA_TXCH_RESET_PCNT(pcnt) | PAS_IOB_DMA_TXCH_RESET_PINTC;
if (*mac->tx_status & PAS_STATUS_SOFT)
reg |= PAS_IOB_DMA_TXCH_RESET_SINTC;
if (*mac->tx_status & PAS_STATUS_ERROR)
reg |= PAS_IOB_DMA_TXCH_RESET_DINTC;
write_iob_reg(mac, PAS_IOB_DMA_TXCH_RESET(mac->dma_txch), reg);
return IRQ_HANDLED;
}
static void pasemi_adjust_link(struct net_device *dev)
{
struct pasemi_mac *mac = netdev_priv(dev);
int msg;
unsigned int flags;
unsigned int new_flags;
if (!mac->phydev->link) {
/* If no link, MAC speed settings don't matter. Just report
* link down and return.
*/
if (mac->link && netif_msg_link(mac))
printk(KERN_INFO "%s: Link is down.\n", dev->name);
netif_carrier_off(dev);
mac->link = 0;
return;
} else
netif_carrier_on(dev);
flags = read_mac_reg(mac, PAS_MAC_CFG_PCFG);
new_flags = flags & ~(PAS_MAC_CFG_PCFG_HD | PAS_MAC_CFG_PCFG_SPD_M |
PAS_MAC_CFG_PCFG_TSR_M);
if (!mac->phydev->duplex)
new_flags |= PAS_MAC_CFG_PCFG_HD;
switch (mac->phydev->speed) {
case 1000:
new_flags |= PAS_MAC_CFG_PCFG_SPD_1G |
PAS_MAC_CFG_PCFG_TSR_1G;
break;
case 100:
new_flags |= PAS_MAC_CFG_PCFG_SPD_100M |
PAS_MAC_CFG_PCFG_TSR_100M;
break;
case 10:
new_flags |= PAS_MAC_CFG_PCFG_SPD_10M |
PAS_MAC_CFG_PCFG_TSR_10M;
break;
default:
printk("Unsupported speed %d\n", mac->phydev->speed);
}
/* Print on link or speed/duplex change */
msg = mac->link != mac->phydev->link || flags != new_flags;
mac->duplex = mac->phydev->duplex;
mac->speed = mac->phydev->speed;
mac->link = mac->phydev->link;
if (new_flags != flags)
write_mac_reg(mac, PAS_MAC_CFG_PCFG, new_flags);
if (msg && netif_msg_link(mac))
printk(KERN_INFO "%s: Link is up at %d Mbps, %s duplex.\n",
dev->name, mac->speed, mac->duplex ? "full" : "half");
}
static int pasemi_mac_phy_init(struct net_device *dev)
{
struct pasemi_mac *mac = netdev_priv(dev);
struct device_node *dn, *phy_dn;
struct phy_device *phydev;
unsigned int phy_id;
const phandle *ph;
const unsigned int *prop;
struct resource r;
int ret;
dn = pci_device_to_OF_node(mac->pdev);
ph = of_get_property(dn, "phy-handle", NULL);
if (!ph)
return -ENODEV;
phy_dn = of_find_node_by_phandle(*ph);
prop = of_get_property(phy_dn, "reg", NULL);
ret = of_address_to_resource(phy_dn->parent, 0, &r);
if (ret)
goto err;
phy_id = *prop;
snprintf(mac->phy_id, BUS_ID_SIZE, PHY_ID_FMT, (int)r.start, phy_id);
of_node_put(phy_dn);
mac->link = 0;
mac->speed = 0;
mac->duplex = -1;
phydev = phy_connect(dev, mac->phy_id, &pasemi_adjust_link, 0, PHY_INTERFACE_MODE_SGMII);
if (IS_ERR(phydev)) {
printk(KERN_ERR "%s: Could not attach to phy\n", dev->name);
return PTR_ERR(phydev);
}
mac->phydev = phydev;
return 0;
err:
of_node_put(phy_dn);
return -ENODEV;
}
static int pasemi_mac_open(struct net_device *dev)
{
struct pasemi_mac *mac = netdev_priv(dev);
int base_irq;
unsigned int flags;
int ret;
/* enable rx section */
write_dma_reg(mac, PAS_DMA_COM_RXCMD, PAS_DMA_COM_RXCMD_EN);
/* enable tx section */
write_dma_reg(mac, PAS_DMA_COM_TXCMD, PAS_DMA_COM_TXCMD_EN);
flags = PAS_MAC_CFG_TXP_FCE | PAS_MAC_CFG_TXP_FPC(3) |
PAS_MAC_CFG_TXP_SL(3) | PAS_MAC_CFG_TXP_COB(0xf) |
PAS_MAC_CFG_TXP_TIFT(8) | PAS_MAC_CFG_TXP_TIFG(12);
write_mac_reg(mac, PAS_MAC_CFG_TXP, flags);
flags = PAS_MAC_CFG_PCFG_S1 | PAS_MAC_CFG_PCFG_PE |
PAS_MAC_CFG_PCFG_PR | PAS_MAC_CFG_PCFG_CE;
flags |= PAS_MAC_CFG_PCFG_TSR_1G | PAS_MAC_CFG_PCFG_SPD_1G;
write_iob_reg(mac, PAS_IOB_DMA_RXCH_CFG(mac->dma_rxch),
PAS_IOB_DMA_RXCH_CFG_CNTTH(0));
write_iob_reg(mac, PAS_IOB_DMA_TXCH_CFG(mac->dma_txch),
PAS_IOB_DMA_TXCH_CFG_CNTTH(128));
/* Clear out any residual packet count state from firmware */
pasemi_mac_restart_rx_intr(mac);
pasemi_mac_restart_tx_intr(mac);
/* 0xffffff is max value, about 16ms */
write_iob_reg(mac, PAS_IOB_DMA_COM_TIMEOUTCFG,
PAS_IOB_DMA_COM_TIMEOUTCFG_TCNT(0xffffff));
write_mac_reg(mac, PAS_MAC_CFG_PCFG, flags);
ret = pasemi_mac_setup_rx_resources(dev);
if (ret)
goto out_rx_resources;
ret = pasemi_mac_setup_tx_resources(dev);
if (ret)
goto out_tx_resources;
write_mac_reg(mac, PAS_MAC_IPC_CHNL,
PAS_MAC_IPC_CHNL_DCHNO(mac->dma_rxch) |
PAS_MAC_IPC_CHNL_BCH(mac->dma_rxch));
/* enable rx if */
write_dma_reg(mac, PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
PAS_DMA_RXINT_RCMDSTA_EN);
/* enable rx channel */
write_dma_reg(mac, PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch),
PAS_DMA_RXCHAN_CCMDSTA_EN |
PAS_DMA_RXCHAN_CCMDSTA_DU);
/* enable tx channel */
write_dma_reg(mac, PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch),
PAS_DMA_TXCHAN_TCMDSTA_EN);
pasemi_mac_replenish_rx_ring(dev);
ret = pasemi_mac_phy_init(dev);
/* Some configs don't have PHYs (XAUI etc), so don't complain about
* failed init due to -ENODEV.
*/
if (ret && ret != -ENODEV)
dev_warn(&mac->pdev->dev, "phy init failed: %d\n", ret);
netif_start_queue(dev);
napi_enable(&mac->napi);
/* Interrupts are a bit different for our DMA controller: While
* it's got one a regular PCI device header, the interrupt there
* is really the base of the range it's using. Each tx and rx
* channel has it's own interrupt source.
*/
base_irq = virq_to_hw(mac->dma_pdev->irq);
mac->tx_irq = irq_create_mapping(NULL, base_irq + mac->dma_txch);
mac->rx_irq = irq_create_mapping(NULL, base_irq + 20 + mac->dma_txch);
ret = request_irq(mac->tx_irq, &pasemi_mac_tx_intr, IRQF_DISABLED,
mac->tx->irq_name, dev);
if (ret) {
dev_err(&mac->pdev->dev, "request_irq of irq %d failed: %d\n",
base_irq + mac->dma_txch, ret);
goto out_tx_int;
}
ret = request_irq(mac->rx_irq, &pasemi_mac_rx_intr, IRQF_DISABLED,
mac->rx->irq_name, dev);
if (ret) {
dev_err(&mac->pdev->dev, "request_irq of irq %d failed: %d\n",
base_irq + 20 + mac->dma_rxch, ret);
goto out_rx_int;
}
if (mac->phydev)
phy_start(mac->phydev);
return 0;
out_rx_int:
free_irq(mac->tx_irq, dev);
out_tx_int:
napi_disable(&mac->napi);
netif_stop_queue(dev);
pasemi_mac_free_tx_resources(dev);
out_tx_resources:
pasemi_mac_free_rx_resources(dev);
out_rx_resources:
return ret;
}
#define MAX_RETRIES 5000
static int pasemi_mac_close(struct net_device *dev)
{
struct pasemi_mac *mac = netdev_priv(dev);
unsigned int stat;
int retries;
if (mac->phydev) {
phy_stop(mac->phydev);
phy_disconnect(mac->phydev);
}
netif_stop_queue(dev);
napi_disable(&mac->napi);
/* Clean out any pending buffers */
pasemi_mac_clean_tx(mac);
pasemi_mac_clean_rx(mac, RX_RING_SIZE);
/* Disable interface */
write_dma_reg(mac, PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch), PAS_DMA_TXCHAN_TCMDSTA_ST);
write_dma_reg(mac, PAS_DMA_RXINT_RCMDSTA(mac->dma_if), PAS_DMA_RXINT_RCMDSTA_ST);
write_dma_reg(mac, PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch), PAS_DMA_RXCHAN_CCMDSTA_ST);
for (retries = 0; retries < MAX_RETRIES; retries++) {
stat = read_dma_reg(mac, PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch));
if (!(stat & PAS_DMA_TXCHAN_TCMDSTA_ACT))
break;
cond_resched();
}
if (stat & PAS_DMA_TXCHAN_TCMDSTA_ACT)
dev_err(&mac->dma_pdev->dev, "Failed to stop tx channel\n");
for (retries = 0; retries < MAX_RETRIES; retries++) {
stat = read_dma_reg(mac, PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch));
if (!(stat & PAS_DMA_RXCHAN_CCMDSTA_ACT))
break;
cond_resched();
}
if (stat & PAS_DMA_RXCHAN_CCMDSTA_ACT)
dev_err(&mac->dma_pdev->dev, "Failed to stop rx channel\n");
for (retries = 0; retries < MAX_RETRIES; retries++) {
stat = read_dma_reg(mac, PAS_DMA_RXINT_RCMDSTA(mac->dma_if));
if (!(stat & PAS_DMA_RXINT_RCMDSTA_ACT))
break;
cond_resched();
}
if (stat & PAS_DMA_RXINT_RCMDSTA_ACT)
dev_err(&mac->dma_pdev->dev, "Failed to stop rx interface\n");
/* Then, disable the channel. This must be done separately from
* stopping, since you can't disable when active.
*/
write_dma_reg(mac, PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch), 0);
write_dma_reg(mac, PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch), 0);
write_dma_reg(mac, PAS_DMA_RXINT_RCMDSTA(mac->dma_if), 0);
free_irq(mac->tx_irq, dev);
free_irq(mac->rx_irq, dev);
/* Free resources */
pasemi_mac_free_rx_resources(dev);
pasemi_mac_free_tx_resources(dev);
return 0;
}
static int pasemi_mac_start_tx(struct sk_buff *skb, struct net_device *dev)
{
struct pasemi_mac *mac = netdev_priv(dev);
struct pasemi_mac_txring *txring;
struct pasemi_mac_buffer *info;
struct pas_dma_xct_descr *dp;
u64 dflags, mactx, ptr;
dma_addr_t map;
int flags;
dflags = XCT_MACTX_O | XCT_MACTX_ST | XCT_MACTX_SS | XCT_MACTX_CRC_PAD;
if (skb->ip_summed == CHECKSUM_PARTIAL) {
const unsigned char *nh = skb_network_header(skb);
switch (ip_hdr(skb)->protocol) {
case IPPROTO_TCP:
dflags |= XCT_MACTX_CSUM_TCP;
dflags |= XCT_MACTX_IPH(skb_network_header_len(skb) >> 2);
dflags |= XCT_MACTX_IPO(nh - skb->data);
break;
case IPPROTO_UDP:
dflags |= XCT_MACTX_CSUM_UDP;
dflags |= XCT_MACTX_IPH(skb_network_header_len(skb) >> 2);
dflags |= XCT_MACTX_IPO(nh - skb->data);
break;
}
}
map = pci_map_single(mac->dma_pdev, skb->data, skb->len, PCI_DMA_TODEVICE);
if (dma_mapping_error(map))
return NETDEV_TX_BUSY;
mactx = dflags | XCT_MACTX_LLEN(skb->len);
ptr = XCT_PTR_LEN(skb->len) | XCT_PTR_ADDR(map);
txring = mac->tx;
spin_lock_irqsave(&txring->lock, flags);
if (RING_AVAIL(txring) <= 1) {
spin_unlock_irqrestore(&txring->lock, flags);
pasemi_mac_clean_tx(mac);
pasemi_mac_restart_tx_intr(mac);
spin_lock_irqsave(&txring->lock, flags);
if (RING_AVAIL(txring) <= 1) {
/* Still no room -- stop the queue and wait for tx
* intr when there's room.
*/
netif_stop_queue(dev);
goto out_err;
}
}
dp = &TX_DESC(mac, txring->next_to_fill);
info = &TX_DESC_INFO(mac, txring->next_to_fill);
dp->mactx = mactx;
dp->ptr = ptr;
info->dma = map;
info->skb = skb;
txring->next_to_fill++;
dev->stats.tx_packets++;
dev->stats.tx_bytes += skb->len;
spin_unlock_irqrestore(&txring->lock, flags);
write_dma_reg(mac, PAS_DMA_TXCHAN_INCR(mac->dma_txch), 1);
return NETDEV_TX_OK;
out_err:
spin_unlock_irqrestore(&txring->lock, flags);
pci_unmap_single(mac->dma_pdev, map, skb->len, PCI_DMA_TODEVICE);
return NETDEV_TX_BUSY;
}
static void pasemi_mac_set_rx_mode(struct net_device *dev)
{
struct pasemi_mac *mac = netdev_priv(dev);
unsigned int flags;
flags = read_mac_reg(mac, PAS_MAC_CFG_PCFG);
/* Set promiscuous */
if (dev->flags & IFF_PROMISC)
flags |= PAS_MAC_CFG_PCFG_PR;
else
flags &= ~PAS_MAC_CFG_PCFG_PR;
write_mac_reg(mac, PAS_MAC_CFG_PCFG, flags);
}
static int pasemi_mac_poll(struct napi_struct *napi, int budget)
{
struct pasemi_mac *mac = container_of(napi, struct pasemi_mac, napi);
struct net_device *dev = mac->netdev;
int pkts;
pasemi_mac_clean_tx(mac);
pkts = pasemi_mac_clean_rx(mac, budget);
if (pkts < budget) {
/* all done, no more packets present */
netif_rx_complete(dev, napi);
pasemi_mac_restart_rx_intr(mac);
}
return pkts;
}
static void __iomem * __devinit map_onedev(struct pci_dev *p, int index)
{
struct device_node *dn;
void __iomem *ret;
dn = pci_device_to_OF_node(p);
if (!dn)
goto fallback;
ret = of_iomap(dn, index);
if (!ret)
goto fallback;
return ret;
fallback:
/* This is hardcoded and ugly, but we have some firmware versions
* that don't provide the register space in the device tree. Luckily
* they are at well-known locations so we can just do the math here.
*/
return ioremap(0xe0000000 + (p->devfn << 12), 0x2000);
}
static int __devinit pasemi_mac_map_regs(struct pasemi_mac *mac)
{
struct resource res;
struct device_node *dn;
int err;
mac->dma_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa007, NULL);
if (!mac->dma_pdev) {
dev_err(&mac->pdev->dev, "Can't find DMA Controller\n");
return -ENODEV;
}
mac->iob_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa001, NULL);
if (!mac->iob_pdev) {
dev_err(&mac->pdev->dev, "Can't find I/O Bridge\n");
return -ENODEV;
}
mac->regs = map_onedev(mac->pdev, 0);
mac->dma_regs = map_onedev(mac->dma_pdev, 0);
mac->iob_regs = map_onedev(mac->iob_pdev, 0);
if (!mac->regs || !mac->dma_regs || !mac->iob_regs) {
dev_err(&mac->pdev->dev, "Can't map registers\n");
return -ENODEV;
}
/* The dma status structure is located in the I/O bridge, and
* is cache coherent.
*/
if (!dma_status) {
dn = pci_device_to_OF_node(mac->iob_pdev);
if (dn)
err = of_address_to_resource(dn, 1, &res);
if (!dn || err) {
/* Fallback for old firmware */
res.start = 0xfd800000;
res.end = res.start + 0x1000;
}
dma_status = __ioremap(res.start, res.end-res.start, 0);
}
return 0;
}
static int __devinit
pasemi_mac_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
static int index = 0;
struct net_device *dev;
struct pasemi_mac *mac;
int err;
DECLARE_MAC_BUF(mac_buf);
err = pci_enable_device(pdev);
if (err)
return err;
dev = alloc_etherdev(sizeof(struct pasemi_mac));
if (dev == NULL) {
dev_err(&pdev->dev,
"pasemi_mac: Could not allocate ethernet device.\n");
err = -ENOMEM;
goto out_disable_device;
}
pci_set_drvdata(pdev, dev);
SET_NETDEV_DEV(dev, &pdev->dev);
mac = netdev_priv(dev);
mac->pdev = pdev;
mac->netdev = dev;
netif_napi_add(dev, &mac->napi, pasemi_mac_poll, 64);
dev->features = NETIF_F_HW_CSUM | NETIF_F_LLTX;
/* These should come out of the device tree eventually */
mac->dma_txch = index;
mac->dma_rxch = index;
/* We probe GMAC before XAUI, but the DMA interfaces are
* in XAUI, GMAC order.
*/
if (index < 4)
mac->dma_if = index + 2;
else
mac->dma_if = index - 4;
index++;
switch (pdev->device) {
case 0xa005:
mac->type = MAC_TYPE_GMAC;
break;
case 0xa006:
mac->type = MAC_TYPE_XAUI;
break;
default:
err = -ENODEV;
goto out;
}
/* get mac addr from device tree */
if (pasemi_get_mac_addr(mac) || !is_valid_ether_addr(mac->mac_addr)) {
err = -ENODEV;
goto out;
}
memcpy(dev->dev_addr, mac->mac_addr, sizeof(mac->mac_addr));
dev->open = pasemi_mac_open;
dev->stop = pasemi_mac_close;
dev->hard_start_xmit = pasemi_mac_start_tx;
dev->set_multicast_list = pasemi_mac_set_rx_mode;
err = pasemi_mac_map_regs(mac);
if (err)
goto out;
mac->rx_status = &dma_status->rx_sta[mac->dma_rxch];
mac->tx_status = &dma_status->tx_sta[mac->dma_txch];
mac->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);
/* Enable most messages by default */
mac->msg_enable = (NETIF_MSG_IFUP << 1 ) - 1;
err = register_netdev(dev);
if (err) {
dev_err(&mac->pdev->dev, "register_netdev failed with error %d\n",
err);
goto out;
} else
printk(KERN_INFO "%s: PA Semi %s: intf %d, txch %d, rxch %d, "
"hw addr %s\n",
dev->name, mac->type == MAC_TYPE_GMAC ? "GMAC" : "XAUI",
mac->dma_if, mac->dma_txch, mac->dma_rxch,
print_mac(mac_buf, dev->dev_addr));
return err;
out:
if (mac->iob_pdev)
pci_dev_put(mac->iob_pdev);
if (mac->dma_pdev)
pci_dev_put(mac->dma_pdev);
if (mac->dma_regs)
iounmap(mac->dma_regs);
if (mac->iob_regs)
iounmap(mac->iob_regs);
if (mac->regs)
iounmap(mac->regs);
free_netdev(dev);
out_disable_device:
pci_disable_device(pdev);
return err;
}
static void __devexit pasemi_mac_remove(struct pci_dev *pdev)
{
struct net_device *netdev = pci_get_drvdata(pdev);
struct pasemi_mac *mac;
if (!netdev)
return;
mac = netdev_priv(netdev);
unregister_netdev(netdev);
pci_disable_device(pdev);
pci_dev_put(mac->dma_pdev);
pci_dev_put(mac->iob_pdev);
iounmap(mac->regs);
iounmap(mac->dma_regs);
iounmap(mac->iob_regs);
pci_set_drvdata(pdev, NULL);
free_netdev(netdev);
}
static struct pci_device_id pasemi_mac_pci_tbl[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_PASEMI, 0xa005) },
{ PCI_DEVICE(PCI_VENDOR_ID_PASEMI, 0xa006) },
{ },
};
MODULE_DEVICE_TABLE(pci, pasemi_mac_pci_tbl);
static struct pci_driver pasemi_mac_driver = {
.name = "pasemi_mac",
.id_table = pasemi_mac_pci_tbl,
.probe = pasemi_mac_probe,
.remove = __devexit_p(pasemi_mac_remove),
};
static void __exit pasemi_mac_cleanup_module(void)
{
pci_unregister_driver(&pasemi_mac_driver);
__iounmap(dma_status);
dma_status = NULL;
}
int pasemi_mac_init_module(void)
{
return pci_register_driver(&pasemi_mac_driver);
}
module_init(pasemi_mac_init_module);
module_exit(pasemi_mac_cleanup_module);
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