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linux/drivers/net/pasemi_mac.c
Stephen Hemminger bea3348eef [NET]: Make NAPI polling independent of struct net_device objects. 
Several devices have multiple independant RX queues per net
device, and some have a single interrupt doorbell for several
queues.

In either case, it's easier to support layouts like that if the
structure representing the poll is independant from the net
device itself.

The signature of the ->poll() call back goes from:

	int foo_poll(struct net_device *dev, int *budget)

to

	int foo_poll(struct napi_struct *napi, int budget)

The caller is returned the number of RX packets processed (or
the number of "NAPI credits" consumed if you want to get
abstract).  The callee no longer messes around bumping
dev->quota, *budget, etc. because that is all handled in the
caller upon return.

The napi_struct is to be embedded in the device driver private data
structures.

Furthermore, it is the driver's responsibility to disable all NAPI
instances in it's ->stop() device close handler.  Since the
napi_struct is privatized into the driver's private data structures,
only the driver knows how to get at all of the napi_struct instances
it may have per-device.

With lots of help and suggestions from Rusty Russell, Roland Dreier,
Michael Chan, Jeff Garzik, and Jamal Hadi Salim.

Bug fixes from Thomas Graf, Roland Dreier, Peter Zijlstra,
Joseph Fannin, Scott Wood, Hans J. Koch, and Michael Chan.

[ Ported to current tree and all drivers converted.  Integrated
  Stephen's follow-on kerneldoc additions, and restored poll_list
  handling to the old style to fix mutual exclusion issues.  -DaveM ]

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2007-10-10 16:47:45 -07:00

1245 lines
30 KiB
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 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 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->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));
pci_write_config_dword(mac->dma_pdev, PAS_DMA_RXCHAN_BASEL(chan_id),
PAS_DMA_RXCHAN_BASEL_BRBL(ring->dma));
pci_write_config_dword(mac->dma_pdev, PAS_DMA_RXCHAN_BASEU(chan_id),
PAS_DMA_RXCHAN_BASEU_BRBH(ring->dma >> 32) |
PAS_DMA_RXCHAN_BASEU_SIZ(RX_RING_SIZE >> 2));
pci_write_config_dword(mac->dma_pdev, PAS_DMA_RXCHAN_CFG(chan_id),
PAS_DMA_RXCHAN_CFG_HBU(1));
pci_write_config_dword(mac->dma_pdev, PAS_DMA_RXINT_BASEL(mac->dma_if),
PAS_DMA_RXINT_BASEL_BRBL(__pa(ring->buffers)));
pci_write_config_dword(mac->dma_pdev, 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));
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->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));
pci_write_config_dword(mac->dma_pdev, 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);
pci_write_config_dword(mac->dma_pdev, PAS_DMA_TXCHAN_BASEU(chan_id), val);
pci_write_config_dword(mac->dma_pdev, 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_use = 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 = (mac->rx->next_to_clean + RX_RING_SIZE -
mac->rx->next_to_fill) & (RX_RING_SIZE - 1);
/* 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();
pci_write_config_dword(mac->dma_pdev,
PAS_DMA_RXCHAN_INCR(mac->dma_rxch),
limit - count);
pci_write_config_dword(mac->dma_pdev,
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;
pci_write_config_dword(mac->iob_pdev,
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;
pci_write_config_dword(mac->iob_pdev,
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);
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;
}
skb = info->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 - NET_IP_ALIGN,
skb->data - NET_IP_ALIGN,
len + NET_IP_ALIGN);
/* 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);
skb->protocol = eth_type_trans(skb, mac->netdev);
if ((macrx & XCT_MACRX_HTY_M) == XCT_MACRX_HTY_IPV4_OK) {
skb->ip_summed = CHECKSUM_COMPLETE;
skb->csum = (macrx & XCT_MACRX_CSUM_M) >>
XCT_MACRX_CSUM_S;
} else
skb->ip_summed = CHECKSUM_NONE;
mac->stats.rx_bytes += len;
mac->stats.rx_packets++;
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;
int start, count;
int flags;
spin_lock_irqsave(&mac->tx->lock, flags);
start = mac->tx->next_to_clean;
count = 0;
for (i = start; i < mac->tx->next_to_use; i++) {
dp = &TX_DESC(mac, i);
if (!dp || (dp->mactx & XCT_MACTX_O))
break;
count++;
info = &TX_DESC_INFO(mac, i);
pci_unmap_single(mac->dma_pdev, info->dma,
info->skb->len, PCI_DMA_TODEVICE);
dev_kfree_skb_irq(info->skb);
info->skb = NULL;
info->dma = 0;
dp->mactx = 0;
dp->ptr = 0;
}
mac->tx->next_to_clean += count;
spin_unlock_irqrestore(&mac->tx->lock, flags);
netif_wake_queue(mac->netdev);
return 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.
*/
pci_read_config_dword(mac->dma_pdev, PAS_DMA_RXINT_RCMDSTA(mac->dma_if), &reg);
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);
pci_write_config_dword(mac->iob_pdev,
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;
pci_write_config_dword(mac->iob_pdev,
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);
pci_read_config_dword(mac->pdev, PAS_MAC_CFG_PCFG, &flags);
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)
pci_write_config_dword(mac->pdev, 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 */
pci_write_config_dword(mac->dma_pdev, PAS_DMA_COM_RXCMD,
PAS_DMA_COM_RXCMD_EN);
/* enable tx section */
pci_write_config_dword(mac->dma_pdev, 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);
pci_write_config_dword(mac->pdev, 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;
pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_RXCH_CFG(mac->dma_rxch),
PAS_IOB_DMA_RXCH_CFG_CNTTH(0));
pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_TXCH_CFG(mac->dma_txch),
PAS_IOB_DMA_TXCH_CFG_CNTTH(32));
/* 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 */
pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_COM_TIMEOUTCFG,
PAS_IOB_DMA_COM_TIMEOUTCFG_TCNT(0xffffff));
pci_write_config_dword(mac->pdev, 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;
pci_write_config_dword(mac->pdev, PAS_MAC_IPC_CHNL,
PAS_MAC_IPC_CHNL_DCHNO(mac->dma_rxch) |
PAS_MAC_IPC_CHNL_BCH(mac->dma_rxch));
/* enable rx if */
pci_write_config_dword(mac->dma_pdev,
PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
PAS_DMA_RXINT_RCMDSTA_EN);
/* enable rx channel */
pci_write_config_dword(mac->dma_pdev,
PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch),
PAS_DMA_RXCHAN_CCMDSTA_EN |
PAS_DMA_RXCHAN_CCMDSTA_DU);
/* enable tx channel */
pci_write_config_dword(mac->dma_pdev,
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 */
pci_write_config_dword(mac->dma_pdev,
PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch),
PAS_DMA_TXCHAN_TCMDSTA_ST);
pci_write_config_dword(mac->dma_pdev,
PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
PAS_DMA_RXINT_RCMDSTA_ST);
pci_write_config_dword(mac->dma_pdev,
PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch),
PAS_DMA_RXCHAN_CCMDSTA_ST);
for (retries = 0; retries < MAX_RETRIES; retries++) {
pci_read_config_dword(mac->dma_pdev,
PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch),
&stat);
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++) {
pci_read_config_dword(mac->dma_pdev,
PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch),
&stat);
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++) {
pci_read_config_dword(mac->dma_pdev,
PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
&stat);
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.
*/
pci_write_config_dword(mac->dma_pdev,
PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch), 0);
pci_write_config_dword(mac->dma_pdev,
PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch), 0);
pci_write_config_dword(mac->dma_pdev,
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;
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;
txring = mac->tx;
spin_lock_irqsave(&txring->lock, flags);
if (txring->next_to_clean - txring->next_to_use == TX_RING_SIZE) {
spin_unlock_irqrestore(&txring->lock, flags);
pasemi_mac_clean_tx(mac);
pasemi_mac_restart_tx_intr(mac);
spin_lock_irqsave(&txring->lock, flags);
if (txring->next_to_clean - txring->next_to_use ==
TX_RING_SIZE) {
/* 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_use);
info = &TX_DESC_INFO(mac, txring->next_to_use);
dp->mactx = dflags | XCT_MACTX_LLEN(skb->len);
dp->ptr = XCT_PTR_LEN(skb->len) | XCT_PTR_ADDR(map);
info->dma = map;
info->skb = skb;
txring->next_to_use++;
mac->stats.tx_packets++;
mac->stats.tx_bytes += skb->len;
spin_unlock_irqrestore(&txring->lock, flags);
pci_write_config_dword(mac->dma_pdev,
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 struct net_device_stats *pasemi_mac_get_stats(struct net_device *dev)
{
struct pasemi_mac *mac = netdev_priv(dev);
return &mac->stats;
}
static void pasemi_mac_set_rx_mode(struct net_device *dev)
{
struct pasemi_mac *mac = netdev_priv(dev);
unsigned int flags;
pci_read_config_dword(mac->pdev, PAS_MAC_CFG_PCFG, &flags);
/* Set promiscuous */
if (dev->flags & IFF_PROMISC)
flags |= PAS_MAC_CFG_PCFG_PR;
else
flags &= ~PAS_MAC_CFG_PCFG_PR;
pci_write_config_dword(mac->pdev, 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;
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 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;
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;
}
SET_MODULE_OWNER(dev);
pci_set_drvdata(pdev, dev);
SET_NETDEV_DEV(dev, &pdev->dev);
mac = netdev_priv(dev);
mac->pdev = pdev;
mac->netdev = dev;
mac->dma_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa007, NULL);
netif_napi_add(dev, &mac->napi, pasemi_mac_poll, 64);
dev->features = NETIF_F_HW_CSUM;
if (!mac->dma_pdev) {
dev_err(&pdev->dev, "Can't find DMA Controller\n");
err = -ENODEV;
goto out_free_netdev;
}
mac->iob_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa001, NULL);
if (!mac->iob_pdev) {
dev_err(&pdev->dev, "Can't find I/O Bridge\n");
err = -ENODEV;
goto out_put_dma_pdev;
}
/* 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->get_stats = pasemi_mac_get_stats;
dev->set_multicast_list = pasemi_mac_set_rx_mode;
/* The dma status structure is located in the I/O bridge, and
* is cache coherent.
*/
if (!dma_status)
/* XXXOJN This should come from the device tree */
dma_status = __ioremap(0xfd800000, 0x1000, 0);
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 %02x:%02x:%02x:%02x:%02x:%02x\n",
dev->name, mac->type == MAC_TYPE_GMAC ? "GMAC" : "XAUI",
mac->dma_if, mac->dma_txch, mac->dma_rxch,
dev->dev_addr[0], dev->dev_addr[1], dev->dev_addr[2],
dev->dev_addr[3], dev->dev_addr[4], dev->dev_addr[5]);
return err;
out:
pci_dev_put(mac->iob_pdev);
out_put_dma_pdev:
pci_dev_put(mac->dma_pdev);
out_free_netdev:
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);
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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