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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 "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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