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linux/drivers/net/pasemi_mac.c
Olof Johansson f5cd787276 PA Semi PWRficient Ethernet driver 
Driver for the PA Semi PWRficient on-chip Ethernet (1/10G)

Basic enablement, will be complemented with performance enhancements
over time. PHY support will be added as well.

Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
2007-02-05 16:58:52 -05:00

1020 lines
25 KiB
C
Raw Blame History

/*
* 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 "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 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 */
/* XXXOJN these should come out of the device tree some day */
#define PAS_DMA_CAP_BASE 0xe00d0040
#define PAS_DMA_CAP_SIZE 0x100
#define PAS_DMA_COM_BASE 0xe00d0100
#define PAS_DMA_COM_SIZE 0x100
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);
const u8 *maddr;
u8 addr[6];
if (!dn) {
dev_dbg(&pdev->dev,
"No device node for mac, not configuring\n");
return -ENOENT;
}
maddr = 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, sizeof(addr));
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->dma) {
if (info->skb) {
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 count;
count = (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))
count = RX_RING_SIZE;
if (count <= 0)
return;
for (i = start; i < start + count; i++) {
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 = dev_alloc_skb(BUF_SIZE);
if (!skb) {
count = i - start;
break;
}
skb->dev = dev;
dma = pci_map_single(mac->dma_pdev, skb->data, skb->len,
PCI_DMA_FROMDEVICE);
if (dma_mapping_error(dma)) {
dev_kfree_skb_irq(info->skb);
count = i - start;
break;
}
info->skb = skb;
info->dma = dma;
*buff = XCT_RXB_LEN(BUF_SIZE) | XCT_RXB_ADDR(dma);
}
wmb();
pci_write_config_dword(mac->dma_pdev,
PAS_DMA_RXCHAN_INCR(mac->dma_rxch),
count);
pci_write_config_dword(mac->dma_pdev,
PAS_DMA_RXINT_INCR(mac->dma_if),
count);
mac->rx->next_to_fill += count;
}
static int pasemi_mac_clean_rx(struct pasemi_mac *mac, int limit)
{
unsigned int i;
int start, count;
spin_lock(&mac->rx->lock);
start = mac->rx->next_to_clean;
count = 0;
for (i = start; i < (start + RX_RING_SIZE) && count < limit; i++) {
struct pas_dma_xct_descr *dp;
struct pasemi_mac_buffer *info;
struct sk_buff *skb;
unsigned int j, len;
dma_addr_t dma;
rmb();
dp = &RX_DESC(mac, i);
if (!(dp->macrx & XCT_MACRX_O))
break;
count++;
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 (j = start; j < (start + RX_RING_SIZE); j++) {
info = &RX_DESC_INFO(mac, j);
if (info->dma == dma)
break;
}
BUG_ON(!info);
BUG_ON(info->dma != dma);
pci_unmap_single(mac->dma_pdev, info->dma, info->skb->len,
PCI_DMA_FROMDEVICE);
skb = info->skb;
len = (dp->macrx & XCT_MACRX_LLEN_M) >> XCT_MACRX_LLEN_S;
skb_put(skb, len);
skb->protocol = eth_type_trans(skb, mac->netdev);
if ((dp->macrx & XCT_MACRX_HTY_M) == XCT_MACRX_HTY_IPV4_OK) {
skb->ip_summed = CHECKSUM_COMPLETE;
skb->csum = (dp->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);
info->dma = 0;
info->skb = NULL;
dp->ptr = 0;
dp->macrx = 0;
}
mac->rx->next_to_clean += 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);
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_INT))
return IRQ_NONE;
netif_rx_schedule(dev);
pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_COM_TIMEOUTCFG,
PAS_IOB_DMA_COM_TIMEOUTCFG_TCNT(0));
reg = PAS_IOB_DMA_RXCH_RESET_PINTC | PAS_IOB_DMA_RXCH_RESET_SINTC |
PAS_IOB_DMA_RXCH_RESET_DINTC;
if (*mac->rx_status & PAS_STATUS_TIMER)
reg |= PAS_IOB_DMA_RXCH_RESET_TINTC;
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;
int was_full;
was_full = mac->tx->next_to_clean - mac->tx->next_to_use == TX_RING_SIZE;
if (!(*mac->tx_status & PAS_STATUS_INT))
return IRQ_NONE;
pasemi_mac_clean_tx(mac);
reg = PAS_IOB_DMA_TXCH_RESET_PINTC | PAS_IOB_DMA_TXCH_RESET_SINTC;
if (*mac->tx_status & PAS_STATUS_TIMER)
reg |= PAS_IOB_DMA_TXCH_RESET_TINTC;
pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_TXCH_RESET(mac->dma_txch),
reg);
if (was_full)
netif_wake_queue(dev);
return IRQ_HANDLED;
}
static int pasemi_mac_open(struct net_device *dev)
{
struct pasemi_mac *mac = netdev_priv(dev);
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(30));
pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_COM_TIMEOUTCFG,
PAS_IOB_DMA_COM_TIMEOUTCFG_TCNT(1000000));
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);
netif_start_queue(dev);
netif_poll_enable(dev);
ret = request_irq(mac->dma_pdev->irq + mac->dma_txch,
&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",
mac->dma_pdev->irq + mac->dma_txch, ret);
goto out_tx_int;
}
ret = request_irq(mac->dma_pdev->irq + 20 + mac->dma_rxch,
&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",
mac->dma_pdev->irq + 20 + mac->dma_rxch, ret);
goto out_rx_int;
}
return 0;
out_rx_int:
free_irq(mac->dma_pdev->irq + mac->dma_txch, dev);
out_tx_int:
netif_poll_disable(dev);
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;
netif_stop_queue(dev);
/* 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->dma_pdev->irq + mac->dma_txch, dev);
free_irq(mac->dma_pdev->irq + 20 + mac->dma_rxch, 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) {
switch (skb->nh.iph->protocol) {
case IPPROTO_TCP:
dflags |= XCT_MACTX_CSUM_TCP;
dflags |= XCT_MACTX_IPH((skb->h.raw - skb->nh.raw) >> 2);
dflags |= XCT_MACTX_IPO(skb->nh.raw - skb->data);
break;
case IPPROTO_UDP:
dflags |= XCT_MACTX_CSUM_UDP;
dflags |= XCT_MACTX_IPH((skb->h.raw - skb->nh.raw) >> 2);
dflags |= XCT_MACTX_IPO(skb->nh.raw - 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);
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 net_device *dev, int *budget)
{
int pkts, limit = min(*budget, dev->quota);
struct pasemi_mac *mac = netdev_priv(dev);
pkts = pasemi_mac_clean_rx(mac, limit);
if (pkts < limit) {
/* all done, no more packets present */
netif_rx_complete(dev);
/* re-enable receive interrupts */
pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_COM_TIMEOUTCFG,
PAS_IOB_DMA_COM_TIMEOUTCFG_TCNT(1000000));
return 0;
} else {
/* used up our quantum, so reschedule */
dev->quota -= pkts;
*budget -= pkts;
return 1;
}
}
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);
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;
dev->weight = 64;
dev->poll = pasemi_mac_poll;
dev->features = NETIF_F_HW_CSUM;
/* 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];
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_LICENSE("GPL");
MODULE_AUTHOR ("Olof Johansson <olof@lixom.net>");
MODULE_DESCRIPTION("PA Semi PWRficient Ethernet driver");
module_init(pasemi_mac_init_module);
module_exit(pasemi_mac_cleanup_module);
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