| /* |
| * 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; |
| } |
| |
| 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); |
| |
| 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_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; |
| |
| 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); |
| |
| 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) { |
| 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); |
| 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); |