/* $Id: sungem.c,v 1.44.2.22 2002/03/13 01:18:12 davem Exp $ * sungem.c: Sun GEM ethernet driver. * * Copyright (C) 2000, 2001, 2002, 2003 David S. Miller (davem@redhat.com) * * Support for Apple GMAC and assorted PHYs, WOL, Power Management * (C) 2001,2002,2003 Benjamin Herrenscmidt (benh@kernel.crashing.org) * (C) 2004,2005 Benjamin Herrenscmidt, IBM Corp. * * NAPI and NETPOLL support * (C) 2004 by Eric Lemoine (eric.lemoine@gmail.com) * * TODO: * - Now that the driver was significantly simplified, I need to rework * the locking. I'm sure we don't need _2_ spinlocks, and we probably * can avoid taking most of them for so long period of time (and schedule * instead). The main issues at this point are caused by the netdev layer * though: * * gem_change_mtu() and gem_set_multicast() are called with a read_lock() * help by net/core/dev.c, thus they can't schedule. That means they can't * call napi_disable() neither, thus force gem_poll() to keep a spinlock * where it could have been dropped. change_mtu especially would love also to * be able to msleep instead of horrid locked delays when resetting the HW, * but that read_lock() makes it impossible, unless I defer it's action to * the reset task, which means it'll be asynchronous (won't take effect until * the system schedules a bit). * * Also, it would probably be possible to also remove most of the long-life * locking in open/resume code path (gem_reinit_chip) by beeing more careful * about when we can start taking interrupts or get xmit() called... */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef CONFIG_SPARC #include #include #endif #ifdef CONFIG_PPC_PMAC #include #include #include #include #endif #include "sungem_phy.h" #include "sungem.h" /* Stripping FCS is causing problems, disabled for now */ #undef STRIP_FCS #define DEFAULT_MSG (NETIF_MSG_DRV | \ NETIF_MSG_PROBE | \ NETIF_MSG_LINK) #define ADVERTISE_MASK (SUPPORTED_10baseT_Half | SUPPORTED_10baseT_Full | \ SUPPORTED_100baseT_Half | SUPPORTED_100baseT_Full | \ SUPPORTED_1000baseT_Half | SUPPORTED_1000baseT_Full | \ SUPPORTED_Pause | SUPPORTED_Autoneg) #define DRV_NAME "sungem" #define DRV_VERSION "0.98" #define DRV_RELDATE "8/24/03" #define DRV_AUTHOR "David S. Miller (davem@redhat.com)" static char version[] __devinitdata = DRV_NAME ".c:v" DRV_VERSION " " DRV_RELDATE " " DRV_AUTHOR "\n"; MODULE_AUTHOR(DRV_AUTHOR); MODULE_DESCRIPTION("Sun GEM Gbit ethernet driver"); MODULE_LICENSE("GPL"); #define GEM_MODULE_NAME "gem" #define PFX GEM_MODULE_NAME ": " static struct pci_device_id gem_pci_tbl[] = { { PCI_VENDOR_ID_SUN, PCI_DEVICE_ID_SUN_GEM, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL }, /* These models only differ from the original GEM in * that their tx/rx fifos are of a different size and * they only support 10/100 speeds. -DaveM * * Apple's GMAC does support gigabit on machines with * the BCM54xx PHYs. -BenH */ { PCI_VENDOR_ID_SUN, PCI_DEVICE_ID_SUN_RIO_GEM, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL }, { PCI_VENDOR_ID_APPLE, PCI_DEVICE_ID_APPLE_UNI_N_GMAC, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL }, { PCI_VENDOR_ID_APPLE, PCI_DEVICE_ID_APPLE_UNI_N_GMACP, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL }, { PCI_VENDOR_ID_APPLE, PCI_DEVICE_ID_APPLE_UNI_N_GMAC2, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL }, { PCI_VENDOR_ID_APPLE, PCI_DEVICE_ID_APPLE_K2_GMAC, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL }, { PCI_VENDOR_ID_APPLE, PCI_DEVICE_ID_APPLE_SH_SUNGEM, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL }, { PCI_VENDOR_ID_APPLE, PCI_DEVICE_ID_APPLE_IPID2_GMAC, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL }, {0, } }; MODULE_DEVICE_TABLE(pci, gem_pci_tbl); static u16 __phy_read(struct gem *gp, int phy_addr, int reg) { u32 cmd; int limit = 10000; cmd = (1 << 30); cmd |= (2 << 28); cmd |= (phy_addr << 23) & MIF_FRAME_PHYAD; cmd |= (reg << 18) & MIF_FRAME_REGAD; cmd |= (MIF_FRAME_TAMSB); writel(cmd, gp->regs + MIF_FRAME); while (--limit) { cmd = readl(gp->regs + MIF_FRAME); if (cmd & MIF_FRAME_TALSB) break; udelay(10); } if (!limit) cmd = 0xffff; return cmd & MIF_FRAME_DATA; } static inline int _phy_read(struct net_device *dev, int mii_id, int reg) { struct gem *gp = netdev_priv(dev); return __phy_read(gp, mii_id, reg); } static inline u16 phy_read(struct gem *gp, int reg) { return __phy_read(gp, gp->mii_phy_addr, reg); } static void __phy_write(struct gem *gp, int phy_addr, int reg, u16 val) { u32 cmd; int limit = 10000; cmd = (1 << 30); cmd |= (1 << 28); cmd |= (phy_addr << 23) & MIF_FRAME_PHYAD; cmd |= (reg << 18) & MIF_FRAME_REGAD; cmd |= (MIF_FRAME_TAMSB); cmd |= (val & MIF_FRAME_DATA); writel(cmd, gp->regs + MIF_FRAME); while (limit--) { cmd = readl(gp->regs + MIF_FRAME); if (cmd & MIF_FRAME_TALSB) break; udelay(10); } } static inline void _phy_write(struct net_device *dev, int mii_id, int reg, int val) { struct gem *gp = netdev_priv(dev); __phy_write(gp, mii_id, reg, val & 0xffff); } static inline void phy_write(struct gem *gp, int reg, u16 val) { __phy_write(gp, gp->mii_phy_addr, reg, val); } static inline void gem_enable_ints(struct gem *gp) { /* Enable all interrupts but TXDONE */ writel(GREG_STAT_TXDONE, gp->regs + GREG_IMASK); } static inline void gem_disable_ints(struct gem *gp) { /* Disable all interrupts, including TXDONE */ writel(GREG_STAT_NAPI | GREG_STAT_TXDONE, gp->regs + GREG_IMASK); } static void gem_get_cell(struct gem *gp) { BUG_ON(gp->cell_enabled < 0); gp->cell_enabled++; #ifdef CONFIG_PPC_PMAC if (gp->cell_enabled == 1) { mb(); pmac_call_feature(PMAC_FTR_GMAC_ENABLE, gp->of_node, 0, 1); udelay(10); } #endif /* CONFIG_PPC_PMAC */ } /* Turn off the chip's clock */ static void gem_put_cell(struct gem *gp) { BUG_ON(gp->cell_enabled <= 0); gp->cell_enabled--; #ifdef CONFIG_PPC_PMAC if (gp->cell_enabled == 0) { mb(); pmac_call_feature(PMAC_FTR_GMAC_ENABLE, gp->of_node, 0, 0); udelay(10); } #endif /* CONFIG_PPC_PMAC */ } static void gem_handle_mif_event(struct gem *gp, u32 reg_val, u32 changed_bits) { if (netif_msg_intr(gp)) printk(KERN_DEBUG "%s: mif interrupt\n", gp->dev->name); } static int gem_pcs_interrupt(struct net_device *dev, struct gem *gp, u32 gem_status) { u32 pcs_istat = readl(gp->regs + PCS_ISTAT); u32 pcs_miistat; if (netif_msg_intr(gp)) printk(KERN_DEBUG "%s: pcs interrupt, pcs_istat: 0x%x\n", gp->dev->name, pcs_istat); if (!(pcs_istat & PCS_ISTAT_LSC)) { printk(KERN_ERR "%s: PCS irq but no link status change???\n", dev->name); return 0; } /* The link status bit latches on zero, so you must * read it twice in such a case to see a transition * to the link being up. */ pcs_miistat = readl(gp->regs + PCS_MIISTAT); if (!(pcs_miistat & PCS_MIISTAT_LS)) pcs_miistat |= (readl(gp->regs + PCS_MIISTAT) & PCS_MIISTAT_LS); if (pcs_miistat & PCS_MIISTAT_ANC) { /* The remote-fault indication is only valid * when autoneg has completed. */ if (pcs_miistat & PCS_MIISTAT_RF) printk(KERN_INFO "%s: PCS AutoNEG complete, " "RemoteFault\n", dev->name); else printk(KERN_INFO "%s: PCS AutoNEG complete.\n", dev->name); } if (pcs_miistat & PCS_MIISTAT_LS) { printk(KERN_INFO "%s: PCS link is now up.\n", dev->name); netif_carrier_on(gp->dev); } else { printk(KERN_INFO "%s: PCS link is now down.\n", dev->name); netif_carrier_off(gp->dev); /* If this happens and the link timer is not running, * reset so we re-negotiate. */ if (!timer_pending(&gp->link_timer)) return 1; } return 0; } static int gem_txmac_interrupt(struct net_device *dev, struct gem *gp, u32 gem_status) { u32 txmac_stat = readl(gp->regs + MAC_TXSTAT); if (netif_msg_intr(gp)) printk(KERN_DEBUG "%s: txmac interrupt, txmac_stat: 0x%x\n", gp->dev->name, txmac_stat); /* Defer timer expiration is quite normal, * don't even log the event. */ if ((txmac_stat & MAC_TXSTAT_DTE) && !(txmac_stat & ~MAC_TXSTAT_DTE)) return 0; if (txmac_stat & MAC_TXSTAT_URUN) { printk(KERN_ERR "%s: TX MAC xmit underrun.\n", dev->name); gp->net_stats.tx_fifo_errors++; } if (txmac_stat & MAC_TXSTAT_MPE) { printk(KERN_ERR "%s: TX MAC max packet size error.\n", dev->name); gp->net_stats.tx_errors++; } /* The rest are all cases of one of the 16-bit TX * counters expiring. */ if (txmac_stat & MAC_TXSTAT_NCE) gp->net_stats.collisions += 0x10000; if (txmac_stat & MAC_TXSTAT_ECE) { gp->net_stats.tx_aborted_errors += 0x10000; gp->net_stats.collisions += 0x10000; } if (txmac_stat & MAC_TXSTAT_LCE) { gp->net_stats.tx_aborted_errors += 0x10000; gp->net_stats.collisions += 0x10000; } /* We do not keep track of MAC_TXSTAT_FCE and * MAC_TXSTAT_PCE events. */ return 0; } /* When we get a RX fifo overflow, the RX unit in GEM is probably hung * so we do the following. * * If any part of the reset goes wrong, we return 1 and that causes the * whole chip to be reset. */ static int gem_rxmac_reset(struct gem *gp) { struct net_device *dev = gp->dev; int limit, i; u64 desc_dma; u32 val; /* First, reset & disable MAC RX. */ writel(MAC_RXRST_CMD, gp->regs + MAC_RXRST); for (limit = 0; limit < 5000; limit++) { if (!(readl(gp->regs + MAC_RXRST) & MAC_RXRST_CMD)) break; udelay(10); } if (limit == 5000) { printk(KERN_ERR "%s: RX MAC will not reset, resetting whole " "chip.\n", dev->name); return 1; } writel(gp->mac_rx_cfg & ~MAC_RXCFG_ENAB, gp->regs + MAC_RXCFG); for (limit = 0; limit < 5000; limit++) { if (!(readl(gp->regs + MAC_RXCFG) & MAC_RXCFG_ENAB)) break; udelay(10); } if (limit == 5000) { printk(KERN_ERR "%s: RX MAC will not disable, resetting whole " "chip.\n", dev->name); return 1; } /* Second, disable RX DMA. */ writel(0, gp->regs + RXDMA_CFG); for (limit = 0; limit < 5000; limit++) { if (!(readl(gp->regs + RXDMA_CFG) & RXDMA_CFG_ENABLE)) break; udelay(10); } if (limit == 5000) { printk(KERN_ERR "%s: RX DMA will not disable, resetting whole " "chip.\n", dev->name); return 1; } udelay(5000); /* Execute RX reset command. */ writel(gp->swrst_base | GREG_SWRST_RXRST, gp->regs + GREG_SWRST); for (limit = 0; limit < 5000; limit++) { if (!(readl(gp->regs + GREG_SWRST) & GREG_SWRST_RXRST)) break; udelay(10); } if (limit == 5000) { printk(KERN_ERR "%s: RX reset command will not execute, resetting " "whole chip.\n", dev->name); return 1; } /* Refresh the RX ring. */ for (i = 0; i < RX_RING_SIZE; i++) { struct gem_rxd *rxd = &gp->init_block->rxd[i]; if (gp->rx_skbs[i] == NULL) { printk(KERN_ERR "%s: Parts of RX ring empty, resetting " "whole chip.\n", dev->name); return 1; } rxd->status_word = cpu_to_le64(RXDCTRL_FRESH(gp)); } gp->rx_new = gp->rx_old = 0; /* Now we must reprogram the rest of RX unit. */ desc_dma = (u64) gp->gblock_dvma; desc_dma += (INIT_BLOCK_TX_RING_SIZE * sizeof(struct gem_txd)); writel(desc_dma >> 32, gp->regs + RXDMA_DBHI); writel(desc_dma & 0xffffffff, gp->regs + RXDMA_DBLOW); writel(RX_RING_SIZE - 4, gp->regs + RXDMA_KICK); val = (RXDMA_CFG_BASE | (RX_OFFSET << 10) | ((14 / 2) << 13) | RXDMA_CFG_FTHRESH_128); writel(val, gp->regs + RXDMA_CFG); if (readl(gp->regs + GREG_BIFCFG) & GREG_BIFCFG_M66EN) writel(((5 & RXDMA_BLANK_IPKTS) | ((8 << 12) & RXDMA_BLANK_ITIME)), gp->regs + RXDMA_BLANK); else writel(((5 & RXDMA_BLANK_IPKTS) | ((4 << 12) & RXDMA_BLANK_ITIME)), gp->regs + RXDMA_BLANK); val = (((gp->rx_pause_off / 64) << 0) & RXDMA_PTHRESH_OFF); val |= (((gp->rx_pause_on / 64) << 12) & RXDMA_PTHRESH_ON); writel(val, gp->regs + RXDMA_PTHRESH); val = readl(gp->regs + RXDMA_CFG); writel(val | RXDMA_CFG_ENABLE, gp->regs + RXDMA_CFG); writel(MAC_RXSTAT_RCV, gp->regs + MAC_RXMASK); val = readl(gp->regs + MAC_RXCFG); writel(val | MAC_RXCFG_ENAB, gp->regs + MAC_RXCFG); return 0; } static int gem_rxmac_interrupt(struct net_device *dev, struct gem *gp, u32 gem_status) { u32 rxmac_stat = readl(gp->regs + MAC_RXSTAT); int ret = 0; if (netif_msg_intr(gp)) printk(KERN_DEBUG "%s: rxmac interrupt, rxmac_stat: 0x%x\n", gp->dev->name, rxmac_stat); if (rxmac_stat & MAC_RXSTAT_OFLW) { u32 smac = readl(gp->regs + MAC_SMACHINE); printk(KERN_ERR "%s: RX MAC fifo overflow smac[%08x].\n", dev->name, smac); gp->net_stats.rx_over_errors++; gp->net_stats.rx_fifo_errors++; ret = gem_rxmac_reset(gp); } if (rxmac_stat & MAC_RXSTAT_ACE) gp->net_stats.rx_frame_errors += 0x10000; if (rxmac_stat & MAC_RXSTAT_CCE) gp->net_stats.rx_crc_errors += 0x10000; if (rxmac_stat & MAC_RXSTAT_LCE) gp->net_stats.rx_length_errors += 0x10000; /* We do not track MAC_RXSTAT_FCE and MAC_RXSTAT_VCE * events. */ return ret; } static int gem_mac_interrupt(struct net_device *dev, struct gem *gp, u32 gem_status) { u32 mac_cstat = readl(gp->regs + MAC_CSTAT); if (netif_msg_intr(gp)) printk(KERN_DEBUG "%s: mac interrupt, mac_cstat: 0x%x\n", gp->dev->name, mac_cstat); /* This interrupt is just for pause frame and pause * tracking. It is useful for diagnostics and debug * but probably by default we will mask these events. */ if (mac_cstat & MAC_CSTAT_PS) gp->pause_entered++; if (mac_cstat & MAC_CSTAT_PRCV) gp->pause_last_time_recvd = (mac_cstat >> 16); return 0; } static int gem_mif_interrupt(struct net_device *dev, struct gem *gp, u32 gem_status) { u32 mif_status = readl(gp->regs + MIF_STATUS); u32 reg_val, changed_bits; reg_val = (mif_status & MIF_STATUS_DATA) >> 16; changed_bits = (mif_status & MIF_STATUS_STAT); gem_handle_mif_event(gp, reg_val, changed_bits); return 0; } static int gem_pci_interrupt(struct net_device *dev, struct gem *gp, u32 gem_status) { u32 pci_estat = readl(gp->regs + GREG_PCIESTAT); if (gp->pdev->vendor == PCI_VENDOR_ID_SUN && gp->pdev->device == PCI_DEVICE_ID_SUN_GEM) { printk(KERN_ERR "%s: PCI error [%04x] ", dev->name, pci_estat); if (pci_estat & GREG_PCIESTAT_BADACK) printk(" "); if (pci_estat & GREG_PCIESTAT_DTRTO) printk(" "); if (pci_estat & GREG_PCIESTAT_OTHER) printk(""); printk("\n"); } else { pci_estat |= GREG_PCIESTAT_OTHER; printk(KERN_ERR "%s: PCI error\n", dev->name); } if (pci_estat & GREG_PCIESTAT_OTHER) { u16 pci_cfg_stat; /* Interrogate PCI config space for the * true cause. */ pci_read_config_word(gp->pdev, PCI_STATUS, &pci_cfg_stat); printk(KERN_ERR "%s: Read PCI cfg space status [%04x]\n", dev->name, pci_cfg_stat); if (pci_cfg_stat & PCI_STATUS_PARITY) printk(KERN_ERR "%s: PCI parity error detected.\n", dev->name); if (pci_cfg_stat & PCI_STATUS_SIG_TARGET_ABORT) printk(KERN_ERR "%s: PCI target abort.\n", dev->name); if (pci_cfg_stat & PCI_STATUS_REC_TARGET_ABORT) printk(KERN_ERR "%s: PCI master acks target abort.\n", dev->name); if (pci_cfg_stat & PCI_STATUS_REC_MASTER_ABORT) printk(KERN_ERR "%s: PCI master abort.\n", dev->name); if (pci_cfg_stat & PCI_STATUS_SIG_SYSTEM_ERROR) printk(KERN_ERR "%s: PCI system error SERR#.\n", dev->name); if (pci_cfg_stat & PCI_STATUS_DETECTED_PARITY) printk(KERN_ERR "%s: PCI parity error.\n", dev->name); /* Write the error bits back to clear them. */ pci_cfg_stat &= (PCI_STATUS_PARITY | PCI_STATUS_SIG_TARGET_ABORT | PCI_STATUS_REC_TARGET_ABORT | PCI_STATUS_REC_MASTER_ABORT | PCI_STATUS_SIG_SYSTEM_ERROR | PCI_STATUS_DETECTED_PARITY); pci_write_config_word(gp->pdev, PCI_STATUS, pci_cfg_stat); } /* For all PCI errors, we should reset the chip. */ return 1; } /* All non-normal interrupt conditions get serviced here. * Returns non-zero if we should just exit the interrupt * handler right now (ie. if we reset the card which invalidates * all of the other original irq status bits). */ static int gem_abnormal_irq(struct net_device *dev, struct gem *gp, u32 gem_status) { if (gem_status & GREG_STAT_RXNOBUF) { /* Frame arrived, no free RX buffers available. */ if (netif_msg_rx_err(gp)) printk(KERN_DEBUG "%s: no buffer for rx frame\n", gp->dev->name); gp->net_stats.rx_dropped++; } if (gem_status & GREG_STAT_RXTAGERR) { /* corrupt RX tag framing */ if (netif_msg_rx_err(gp)) printk(KERN_DEBUG "%s: corrupt rx tag framing\n", gp->dev->name); gp->net_stats.rx_errors++; goto do_reset; } if (gem_status & GREG_STAT_PCS) { if (gem_pcs_interrupt(dev, gp, gem_status)) goto do_reset; } if (gem_status & GREG_STAT_TXMAC) { if (gem_txmac_interrupt(dev, gp, gem_status)) goto do_reset; } if (gem_status & GREG_STAT_RXMAC) { if (gem_rxmac_interrupt(dev, gp, gem_status)) goto do_reset; } if (gem_status & GREG_STAT_MAC) { if (gem_mac_interrupt(dev, gp, gem_status)) goto do_reset; } if (gem_status & GREG_STAT_MIF) { if (gem_mif_interrupt(dev, gp, gem_status)) goto do_reset; } if (gem_status & GREG_STAT_PCIERR) { if (gem_pci_interrupt(dev, gp, gem_status)) goto do_reset; } return 0; do_reset: gp->reset_task_pending = 1; schedule_work(&gp->reset_task); return 1; } static __inline__ void gem_tx(struct net_device *dev, struct gem *gp, u32 gem_status) { int entry, limit; if (netif_msg_intr(gp)) printk(KERN_DEBUG "%s: tx interrupt, gem_status: 0x%x\n", gp->dev->name, gem_status); entry = gp->tx_old; limit = ((gem_status & GREG_STAT_TXNR) >> GREG_STAT_TXNR_SHIFT); while (entry != limit) { struct sk_buff *skb; struct gem_txd *txd; dma_addr_t dma_addr; u32 dma_len; int frag; if (netif_msg_tx_done(gp)) printk(KERN_DEBUG "%s: tx done, slot %d\n", gp->dev->name, entry); skb = gp->tx_skbs[entry]; if (skb_shinfo(skb)->nr_frags) { int last = entry + skb_shinfo(skb)->nr_frags; int walk = entry; int incomplete = 0; last &= (TX_RING_SIZE - 1); for (;;) { walk = NEXT_TX(walk); if (walk == limit) incomplete = 1; if (walk == last) break; } if (incomplete) break; } gp->tx_skbs[entry] = NULL; gp->net_stats.tx_bytes += skb->len; for (frag = 0; frag <= skb_shinfo(skb)->nr_frags; frag++) { txd = &gp->init_block->txd[entry]; dma_addr = le64_to_cpu(txd->buffer); dma_len = le64_to_cpu(txd->control_word) & TXDCTRL_BUFSZ; pci_unmap_page(gp->pdev, dma_addr, dma_len, PCI_DMA_TODEVICE); entry = NEXT_TX(entry); } gp->net_stats.tx_packets++; dev_kfree_skb_irq(skb); } gp->tx_old = entry; if (netif_queue_stopped(dev) && TX_BUFFS_AVAIL(gp) > (MAX_SKB_FRAGS + 1)) netif_wake_queue(dev); } static __inline__ void gem_post_rxds(struct gem *gp, int limit) { int cluster_start, curr, count, kick; cluster_start = curr = (gp->rx_new & ~(4 - 1)); count = 0; kick = -1; wmb(); while (curr != limit) { curr = NEXT_RX(curr); if (++count == 4) { struct gem_rxd *rxd = &gp->init_block->rxd[cluster_start]; for (;;) { rxd->status_word = cpu_to_le64(RXDCTRL_FRESH(gp)); rxd++; cluster_start = NEXT_RX(cluster_start); if (cluster_start == curr) break; } kick = curr; count = 0; } } if (kick >= 0) { mb(); writel(kick, gp->regs + RXDMA_KICK); } } static int gem_rx(struct gem *gp, int work_to_do) { int entry, drops, work_done = 0; u32 done; __sum16 csum; if (netif_msg_rx_status(gp)) printk(KERN_DEBUG "%s: rx interrupt, done: %d, rx_new: %d\n", gp->dev->name, readl(gp->regs + RXDMA_DONE), gp->rx_new); entry = gp->rx_new; drops = 0; done = readl(gp->regs + RXDMA_DONE); for (;;) { struct gem_rxd *rxd = &gp->init_block->rxd[entry]; struct sk_buff *skb; u64 status = le64_to_cpu(rxd->status_word); dma_addr_t dma_addr; int len; if ((status & RXDCTRL_OWN) != 0) break; if (work_done >= RX_RING_SIZE || work_done >= work_to_do) break; /* When writing back RX descriptor, GEM writes status * then buffer address, possibly in seperate transactions. * If we don't wait for the chip to write both, we could * post a new buffer to this descriptor then have GEM spam * on the buffer address. We sync on the RX completion * register to prevent this from happening. */ if (entry == done) { done = readl(gp->regs + RXDMA_DONE); if (entry == done) break; } /* We can now account for the work we're about to do */ work_done++; skb = gp->rx_skbs[entry]; len = (status & RXDCTRL_BUFSZ) >> 16; if ((len < ETH_ZLEN) || (status & RXDCTRL_BAD)) { gp->net_stats.rx_errors++; if (len < ETH_ZLEN) gp->net_stats.rx_length_errors++; if (len & RXDCTRL_BAD) gp->net_stats.rx_crc_errors++; /* We'll just return it to GEM. */ drop_it: gp->net_stats.rx_dropped++; goto next; } dma_addr = le64_to_cpu(rxd->buffer); if (len > RX_COPY_THRESHOLD) { struct sk_buff *new_skb; new_skb = gem_alloc_skb(RX_BUF_ALLOC_SIZE(gp), GFP_ATOMIC); if (new_skb == NULL) { drops++; goto drop_it; } pci_unmap_page(gp->pdev, dma_addr, RX_BUF_ALLOC_SIZE(gp), PCI_DMA_FROMDEVICE); gp->rx_skbs[entry] = new_skb; new_skb->dev = gp->dev; skb_put(new_skb, (gp->rx_buf_sz + RX_OFFSET)); rxd->buffer = cpu_to_le64(pci_map_page(gp->pdev, virt_to_page(new_skb->data), offset_in_page(new_skb->data), RX_BUF_ALLOC_SIZE(gp), PCI_DMA_FROMDEVICE)); skb_reserve(new_skb, RX_OFFSET); /* Trim the original skb for the netif. */ skb_trim(skb, len); } else { struct sk_buff *copy_skb = dev_alloc_skb(len + 2); if (copy_skb == NULL) { drops++; goto drop_it; } skb_reserve(copy_skb, 2); skb_put(copy_skb, len); pci_dma_sync_single_for_cpu(gp->pdev, dma_addr, len, PCI_DMA_FROMDEVICE); skb_copy_from_linear_data(skb, copy_skb->data, len); pci_dma_sync_single_for_device(gp->pdev, dma_addr, len, PCI_DMA_FROMDEVICE); /* We'll reuse the original ring buffer. */ skb = copy_skb; } csum = (__force __sum16)htons((status & RXDCTRL_TCPCSUM) ^ 0xffff); skb->csum = csum_unfold(csum); skb->ip_summed = CHECKSUM_COMPLETE; skb->protocol = eth_type_trans(skb, gp->dev); netif_receive_skb(skb); gp->net_stats.rx_packets++; gp->net_stats.rx_bytes += len; next: entry = NEXT_RX(entry); } gem_post_rxds(gp, entry); gp->rx_new = entry; if (drops) printk(KERN_INFO "%s: Memory squeeze, deferring packet.\n", gp->dev->name); return work_done; } static int gem_poll(struct napi_struct *napi, int budget) { struct gem *gp = container_of(napi, struct gem, napi); struct net_device *dev = gp->dev; unsigned long flags; int work_done; /* * NAPI locking nightmare: See comment at head of driver */ spin_lock_irqsave(&gp->lock, flags); work_done = 0; do { /* Handle anomalies */ if (gp->status & GREG_STAT_ABNORMAL) { if (gem_abnormal_irq(dev, gp, gp->status)) break; } /* Run TX completion thread */ spin_lock(&gp->tx_lock); gem_tx(dev, gp, gp->status); spin_unlock(&gp->tx_lock); spin_unlock_irqrestore(&gp->lock, flags); /* Run RX thread. We don't use any locking here, * code willing to do bad things - like cleaning the * rx ring - must call napi_disable(), which * schedule_timeout()'s if polling is already disabled. */ work_done += gem_rx(gp, budget - work_done); if (work_done >= budget) return work_done; spin_lock_irqsave(&gp->lock, flags); gp->status = readl(gp->regs + GREG_STAT); } while (gp->status & GREG_STAT_NAPI); __netif_rx_complete(napi); gem_enable_ints(gp); spin_unlock_irqrestore(&gp->lock, flags); return work_done; } static irqreturn_t gem_interrupt(int irq, void *dev_id) { struct net_device *dev = dev_id; struct gem *gp = netdev_priv(dev); unsigned long flags; /* Swallow interrupts when shutting the chip down, though * that shouldn't happen, we should have done free_irq() at * this point... */ if (!gp->running) return IRQ_HANDLED; spin_lock_irqsave(&gp->lock, flags); if (netif_rx_schedule_prep(&gp->napi)) { u32 gem_status = readl(gp->regs + GREG_STAT); if (gem_status == 0) { napi_enable(&gp->napi); spin_unlock_irqrestore(&gp->lock, flags); return IRQ_NONE; } gp->status = gem_status; gem_disable_ints(gp); __netif_rx_schedule(&gp->napi); } spin_unlock_irqrestore(&gp->lock, flags); /* If polling was disabled at the time we received that * interrupt, we may return IRQ_HANDLED here while we * should return IRQ_NONE. No big deal... */ return IRQ_HANDLED; } #ifdef CONFIG_NET_POLL_CONTROLLER static void gem_poll_controller(struct net_device *dev) { /* gem_interrupt is safe to reentrance so no need * to disable_irq here. */ gem_interrupt(dev->irq, dev); } #endif static void gem_tx_timeout(struct net_device *dev) { struct gem *gp = netdev_priv(dev); printk(KERN_ERR "%s: transmit timed out, resetting\n", dev->name); if (!gp->running) { printk("%s: hrm.. hw not running !\n", dev->name); return; } printk(KERN_ERR "%s: TX_STATE[%08x:%08x:%08x]\n", dev->name, readl(gp->regs + TXDMA_CFG), readl(gp->regs + MAC_TXSTAT), readl(gp->regs + MAC_TXCFG)); printk(KERN_ERR "%s: RX_STATE[%08x:%08x:%08x]\n", dev->name, readl(gp->regs + RXDMA_CFG), readl(gp->regs + MAC_RXSTAT), readl(gp->regs + MAC_RXCFG)); spin_lock_irq(&gp->lock); spin_lock(&gp->tx_lock); gp->reset_task_pending = 1; schedule_work(&gp->reset_task); spin_unlock(&gp->tx_lock); spin_unlock_irq(&gp->lock); } static __inline__ int gem_intme(int entry) { /* Algorithm: IRQ every 1/2 of descriptors. */ if (!(entry & ((TX_RING_SIZE>>1)-1))) return 1; return 0; } static int gem_start_xmit(struct sk_buff *skb, struct net_device *dev) { struct gem *gp = netdev_priv(dev); int entry; u64 ctrl; unsigned long flags; ctrl = 0; if (skb->ip_summed == CHECKSUM_PARTIAL) { const u64 csum_start_off = skb_transport_offset(skb); const u64 csum_stuff_off = csum_start_off + skb->csum_offset; ctrl = (TXDCTRL_CENAB | (csum_start_off << 15) | (csum_stuff_off << 21)); } local_irq_save(flags); if (!spin_trylock(&gp->tx_lock)) { /* Tell upper layer to requeue */ local_irq_restore(flags); return NETDEV_TX_LOCKED; } /* We raced with gem_do_stop() */ if (!gp->running) { spin_unlock_irqrestore(&gp->tx_lock, flags); return NETDEV_TX_BUSY; } /* This is a hard error, log it. */ if (TX_BUFFS_AVAIL(gp) <= (skb_shinfo(skb)->nr_frags + 1)) { netif_stop_queue(dev); spin_unlock_irqrestore(&gp->tx_lock, flags); printk(KERN_ERR PFX "%s: BUG! Tx Ring full when queue awake!\n", dev->name); return NETDEV_TX_BUSY; } entry = gp->tx_new; gp->tx_skbs[entry] = skb; if (skb_shinfo(skb)->nr_frags == 0) { struct gem_txd *txd = &gp->init_block->txd[entry]; dma_addr_t mapping; u32 len; len = skb->len; mapping = pci_map_page(gp->pdev, virt_to_page(skb->data), offset_in_page(skb->data), len, PCI_DMA_TODEVICE); ctrl |= TXDCTRL_SOF | TXDCTRL_EOF | len; if (gem_intme(entry)) ctrl |= TXDCTRL_INTME; txd->buffer = cpu_to_le64(mapping); wmb(); txd->control_word = cpu_to_le64(ctrl); entry = NEXT_TX(entry); } else { struct gem_txd *txd; u32 first_len; u64 intme; dma_addr_t first_mapping; int frag, first_entry = entry; intme = 0; if (gem_intme(entry)) intme |= TXDCTRL_INTME; /* We must give this initial chunk to the device last. * Otherwise we could race with the device. */ first_len = skb_headlen(skb); first_mapping = pci_map_page(gp->pdev, virt_to_page(skb->data), offset_in_page(skb->data), first_len, PCI_DMA_TODEVICE); entry = NEXT_TX(entry); for (frag = 0; frag < skb_shinfo(skb)->nr_frags; frag++) { skb_frag_t *this_frag = &skb_shinfo(skb)->frags[frag]; u32 len; dma_addr_t mapping; u64 this_ctrl; len = this_frag->size; mapping = pci_map_page(gp->pdev, this_frag->page, this_frag->page_offset, len, PCI_DMA_TODEVICE); this_ctrl = ctrl; if (frag == skb_shinfo(skb)->nr_frags - 1) this_ctrl |= TXDCTRL_EOF; txd = &gp->init_block->txd[entry]; txd->buffer = cpu_to_le64(mapping); wmb(); txd->control_word = cpu_to_le64(this_ctrl | len); if (gem_intme(entry)) intme |= TXDCTRL_INTME; entry = NEXT_TX(entry); } txd = &gp->init_block->txd[first_entry]; txd->buffer = cpu_to_le64(first_mapping); wmb(); txd->control_word = cpu_to_le64(ctrl | TXDCTRL_SOF | intme | first_len); } gp->tx_new = entry; if (TX_BUFFS_AVAIL(gp) <= (MAX_SKB_FRAGS + 1)) netif_stop_queue(dev); if (netif_msg_tx_queued(gp)) printk(KERN_DEBUG "%s: tx queued, slot %d, skblen %d\n", dev->name, entry, skb->len); mb(); writel(gp->tx_new, gp->regs + TXDMA_KICK); spin_unlock_irqrestore(&gp->tx_lock, flags); dev->trans_start = jiffies; return NETDEV_TX_OK; } static void gem_pcs_reset(struct gem *gp) { int limit; u32 val; /* Reset PCS unit. */ val = readl(gp->regs + PCS_MIICTRL); val |= PCS_MIICTRL_RST; writel(val, gp->regs + PCS_MIICTRL); limit = 32; while (readl(gp->regs + PCS_MIICTRL) & PCS_MIICTRL_RST) { udelay(100); if (limit-- <= 0) break; } if (limit < 0) printk(KERN_WARNING "%s: PCS reset bit would not clear.\n", gp->dev->name); } static void gem_pcs_reinit_adv(struct gem *gp) { u32 val; /* Make sure PCS is disabled while changing advertisement * configuration. */ val = readl(gp->regs + PCS_CFG); val &= ~(PCS_CFG_ENABLE | PCS_CFG_TO); writel(val, gp->regs + PCS_CFG); /* Advertise all capabilities except assymetric * pause. */ val = readl(gp->regs + PCS_MIIADV); val |= (PCS_MIIADV_FD | PCS_MIIADV_HD | PCS_MIIADV_SP | PCS_MIIADV_AP); writel(val, gp->regs + PCS_MIIADV); /* Enable and restart auto-negotiation, disable wrapback/loopback, * and re-enable PCS. */ val = readl(gp->regs + PCS_MIICTRL); val |= (PCS_MIICTRL_RAN | PCS_MIICTRL_ANE); val &= ~PCS_MIICTRL_WB; writel(val, gp->regs + PCS_MIICTRL); val = readl(gp->regs + PCS_CFG); val |= PCS_CFG_ENABLE; writel(val, gp->regs + PCS_CFG); /* Make sure serialink loopback is off. The meaning * of this bit is logically inverted based upon whether * you are in Serialink or SERDES mode. */ val = readl(gp->regs + PCS_SCTRL); if (gp->phy_type == phy_serialink) val &= ~PCS_SCTRL_LOOP; else val |= PCS_SCTRL_LOOP; writel(val, gp->regs + PCS_SCTRL); } #define STOP_TRIES 32 /* Must be invoked under gp->lock and gp->tx_lock. */ static void gem_reset(struct gem *gp) { int limit; u32 val; /* Make sure we won't get any more interrupts */ writel(0xffffffff, gp->regs + GREG_IMASK); /* Reset the chip */ writel(gp->swrst_base | GREG_SWRST_TXRST | GREG_SWRST_RXRST, gp->regs + GREG_SWRST); limit = STOP_TRIES; do { udelay(20); val = readl(gp->regs + GREG_SWRST); if (limit-- <= 0) break; } while (val & (GREG_SWRST_TXRST | GREG_SWRST_RXRST)); if (limit <= 0) printk(KERN_ERR "%s: SW reset is ghetto.\n", gp->dev->name); if (gp->phy_type == phy_serialink || gp->phy_type == phy_serdes) gem_pcs_reinit_adv(gp); } /* Must be invoked under gp->lock and gp->tx_lock. */ static void gem_start_dma(struct gem *gp) { u32 val; /* We are ready to rock, turn everything on. */ val = readl(gp->regs + TXDMA_CFG); writel(val | TXDMA_CFG_ENABLE, gp->regs + TXDMA_CFG); val = readl(gp->regs + RXDMA_CFG); writel(val | RXDMA_CFG_ENABLE, gp->regs + RXDMA_CFG); val = readl(gp->regs + MAC_TXCFG); writel(val | MAC_TXCFG_ENAB, gp->regs + MAC_TXCFG); val = readl(gp->regs + MAC_RXCFG); writel(val | MAC_RXCFG_ENAB, gp->regs + MAC_RXCFG); (void) readl(gp->regs + MAC_RXCFG); udelay(100); gem_enable_ints(gp); writel(RX_RING_SIZE - 4, gp->regs + RXDMA_KICK); } /* Must be invoked under gp->lock and gp->tx_lock. DMA won't be * actually stopped before about 4ms tho ... */ static void gem_stop_dma(struct gem *gp) { u32 val; /* We are done rocking, turn everything off. */ val = readl(gp->regs + TXDMA_CFG); writel(val & ~TXDMA_CFG_ENABLE, gp->regs + TXDMA_CFG); val = readl(gp->regs + RXDMA_CFG); writel(val & ~RXDMA_CFG_ENABLE, gp->regs + RXDMA_CFG); val = readl(gp->regs + MAC_TXCFG); writel(val & ~MAC_TXCFG_ENAB, gp->regs + MAC_TXCFG); val = readl(gp->regs + MAC_RXCFG); writel(val & ~MAC_RXCFG_ENAB, gp->regs + MAC_RXCFG); (void) readl(gp->regs + MAC_RXCFG); /* Need to wait a bit ... done by the caller */ } /* Must be invoked under gp->lock and gp->tx_lock. */ // XXX dbl check what that function should do when called on PCS PHY static void gem_begin_auto_negotiation(struct gem *gp, struct ethtool_cmd *ep) { u32 advertise, features; int autoneg; int speed; int duplex; if (gp->phy_type != phy_mii_mdio0 && gp->phy_type != phy_mii_mdio1) goto non_mii; /* Setup advertise */ if (found_mii_phy(gp)) features = gp->phy_mii.def->features; else features = 0; advertise = features & ADVERTISE_MASK; if (gp->phy_mii.advertising != 0) advertise &= gp->phy_mii.advertising; autoneg = gp->want_autoneg; speed = gp->phy_mii.speed; duplex = gp->phy_mii.duplex; /* Setup link parameters */ if (!ep) goto start_aneg; if (ep->autoneg == AUTONEG_ENABLE) { advertise = ep->advertising; autoneg = 1; } else { autoneg = 0; speed = ep->speed; duplex = ep->duplex; } start_aneg: /* Sanitize settings based on PHY capabilities */ if ((features & SUPPORTED_Autoneg) == 0) autoneg = 0; if (speed == SPEED_1000 && !(features & (SUPPORTED_1000baseT_Half | SUPPORTED_1000baseT_Full))) speed = SPEED_100; if (speed == SPEED_100 && !(features & (SUPPORTED_100baseT_Half | SUPPORTED_100baseT_Full))) speed = SPEED_10; if (duplex == DUPLEX_FULL && !(features & (SUPPORTED_1000baseT_Full | SUPPORTED_100baseT_Full | SUPPORTED_10baseT_Full))) duplex = DUPLEX_HALF; if (speed == 0) speed = SPEED_10; /* If we are asleep, we don't try to actually setup the PHY, we * just store the settings */ if (gp->asleep) { gp->phy_mii.autoneg = gp->want_autoneg = autoneg; gp->phy_mii.speed = speed; gp->phy_mii.duplex = duplex; return; } /* Configure PHY & start aneg */ gp->want_autoneg = autoneg; if (autoneg) { if (found_mii_phy(gp)) gp->phy_mii.def->ops->setup_aneg(&gp->phy_mii, advertise); gp->lstate = link_aneg; } else { if (found_mii_phy(gp)) gp->phy_mii.def->ops->setup_forced(&gp->phy_mii, speed, duplex); gp->lstate = link_force_ok; } non_mii: gp->timer_ticks = 0; mod_timer(&gp->link_timer, jiffies + ((12 * HZ) / 10)); } /* A link-up condition has occurred, initialize and enable the * rest of the chip. * * Must be invoked under gp->lock and gp->tx_lock. */ static int gem_set_link_modes(struct gem *gp) { u32 val; int full_duplex, speed, pause; full_duplex = 0; speed = SPEED_10; pause = 0; if (found_mii_phy(gp)) { if (gp->phy_mii.def->ops->read_link(&gp->phy_mii)) return 1; full_duplex = (gp->phy_mii.duplex == DUPLEX_FULL); speed = gp->phy_mii.speed; pause = gp->phy_mii.pause; } else if (gp->phy_type == phy_serialink || gp->phy_type == phy_serdes) { u32 pcs_lpa = readl(gp->regs + PCS_MIILP); if ((pcs_lpa & PCS_MIIADV_FD) || gp->phy_type == phy_serdes) full_duplex = 1; speed = SPEED_1000; } if (netif_msg_link(gp)) printk(KERN_INFO "%s: Link is up at %d Mbps, %s-duplex.\n", gp->dev->name, speed, (full_duplex ? "full" : "half")); if (!gp->running) return 0; val = (MAC_TXCFG_EIPG0 | MAC_TXCFG_NGU); if (full_duplex) { val |= (MAC_TXCFG_ICS | MAC_TXCFG_ICOLL); } else { /* MAC_TXCFG_NBO must be zero. */ } writel(val, gp->regs + MAC_TXCFG); val = (MAC_XIFCFG_OE | MAC_XIFCFG_LLED); if (!full_duplex && (gp->phy_type == phy_mii_mdio0 || gp->phy_type == phy_mii_mdio1)) { val |= MAC_XIFCFG_DISE; } else if (full_duplex) { val |= MAC_XIFCFG_FLED; } if (speed == SPEED_1000) val |= (MAC_XIFCFG_GMII); writel(val, gp->regs + MAC_XIFCFG); /* If gigabit and half-duplex, enable carrier extension * mode. Else, disable it. */ if (speed == SPEED_1000 && !full_duplex) { val = readl(gp->regs + MAC_TXCFG); writel(val | MAC_TXCFG_TCE, gp->regs + MAC_TXCFG); val = readl(gp->regs + MAC_RXCFG); writel(val | MAC_RXCFG_RCE, gp->regs + MAC_RXCFG); } else { val = readl(gp->regs + MAC_TXCFG); writel(val & ~MAC_TXCFG_TCE, gp->regs + MAC_TXCFG); val = readl(gp->regs + MAC_RXCFG); writel(val & ~MAC_RXCFG_RCE, gp->regs + MAC_RXCFG); } if (gp->phy_type == phy_serialink || gp->phy_type == phy_serdes) { u32 pcs_lpa = readl(gp->regs + PCS_MIILP); if (pcs_lpa & (PCS_MIIADV_SP | PCS_MIIADV_AP)) pause = 1; } if (netif_msg_link(gp)) { if (pause) { printk(KERN_INFO "%s: Pause is enabled " "(rxfifo: %d off: %d on: %d)\n", gp->dev->name, gp->rx_fifo_sz, gp->rx_pause_off, gp->rx_pause_on); } else { printk(KERN_INFO "%s: Pause is disabled\n", gp->dev->name); } } if (!full_duplex) writel(512, gp->regs + MAC_STIME); else writel(64, gp->regs + MAC_STIME); val = readl(gp->regs + MAC_MCCFG); if (pause) val |= (MAC_MCCFG_SPE | MAC_MCCFG_RPE); else val &= ~(MAC_MCCFG_SPE | MAC_MCCFG_RPE); writel(val, gp->regs + MAC_MCCFG); gem_start_dma(gp); return 0; } /* Must be invoked under gp->lock and gp->tx_lock. */ static int gem_mdio_link_not_up(struct gem *gp) { switch (gp->lstate) { case link_force_ret: if (netif_msg_link(gp)) printk(KERN_INFO "%s: Autoneg failed again, keeping" " forced mode\n", gp->dev->name); gp->phy_mii.def->ops->setup_forced(&gp->phy_mii, gp->last_forced_speed, DUPLEX_HALF); gp->timer_ticks = 5; gp->lstate = link_force_ok; return 0; case link_aneg: /* We try forced modes after a failed aneg only on PHYs that don't * have "magic_aneg" bit set, which means they internally do the * while forced-mode thingy. On these, we just restart aneg */ if (gp->phy_mii.def->magic_aneg) return 1; if (netif_msg_link(gp)) printk(KERN_INFO "%s: switching to forced 100bt\n", gp->dev->name); /* Try forced modes. */ gp->phy_mii.def->ops->setup_forced(&gp->phy_mii, SPEED_100, DUPLEX_HALF); gp->timer_ticks = 5; gp->lstate = link_force_try; return 0; case link_force_try: /* Downgrade from 100 to 10 Mbps if necessary. * If already at 10Mbps, warn user about the * situation every 10 ticks. */ if (gp->phy_mii.speed == SPEED_100) { gp->phy_mii.def->ops->setup_forced(&gp->phy_mii, SPEED_10, DUPLEX_HALF); gp->timer_ticks = 5; if (netif_msg_link(gp)) printk(KERN_INFO "%s: switching to forced 10bt\n", gp->dev->name); return 0; } else return 1; default: return 0; } } static void gem_link_timer(unsigned long data) { struct gem *gp = (struct gem *) data; int restart_aneg = 0; if (gp->asleep) return; spin_lock_irq(&gp->lock); spin_lock(&gp->tx_lock); gem_get_cell(gp); /* If the reset task is still pending, we just * reschedule the link timer */ if (gp->reset_task_pending) goto restart; if (gp->phy_type == phy_serialink || gp->phy_type == phy_serdes) { u32 val = readl(gp->regs + PCS_MIISTAT); if (!(val & PCS_MIISTAT_LS)) val = readl(gp->regs + PCS_MIISTAT); if ((val & PCS_MIISTAT_LS) != 0) { if (gp->lstate == link_up) goto restart; gp->lstate = link_up; netif_carrier_on(gp->dev); (void)gem_set_link_modes(gp); } goto restart; } if (found_mii_phy(gp) && gp->phy_mii.def->ops->poll_link(&gp->phy_mii)) { /* Ok, here we got a link. If we had it due to a forced * fallback, and we were configured for autoneg, we do * retry a short autoneg pass. If you know your hub is * broken, use ethtool ;) */ if (gp->lstate == link_force_try && gp->want_autoneg) { gp->lstate = link_force_ret; gp->last_forced_speed = gp->phy_mii.speed; gp->timer_ticks = 5; if (netif_msg_link(gp)) printk(KERN_INFO "%s: Got link after fallback, retrying" " autoneg once...\n", gp->dev->name); gp->phy_mii.def->ops->setup_aneg(&gp->phy_mii, gp->phy_mii.advertising); } else if (gp->lstate != link_up) { gp->lstate = link_up; netif_carrier_on(gp->dev); if (gem_set_link_modes(gp)) restart_aneg = 1; } } else { /* If the link was previously up, we restart the * whole process */ if (gp->lstate == link_up) { gp->lstate = link_down; if (netif_msg_link(gp)) printk(KERN_INFO "%s: Link down\n", gp->dev->name); netif_carrier_off(gp->dev); gp->reset_task_pending = 1; schedule_work(&gp->reset_task); restart_aneg = 1; } else if (++gp->timer_ticks > 10) { if (found_mii_phy(gp)) restart_aneg = gem_mdio_link_not_up(gp); else restart_aneg = 1; } } if (restart_aneg) { gem_begin_auto_negotiation(gp, NULL); goto out_unlock; } restart: mod_timer(&gp->link_timer, jiffies + ((12 * HZ) / 10)); out_unlock: gem_put_cell(gp); spin_unlock(&gp->tx_lock); spin_unlock_irq(&gp->lock); } /* Must be invoked under gp->lock and gp->tx_lock. */ static void gem_clean_rings(struct gem *gp) { struct gem_init_block *gb = gp->init_block; struct sk_buff *skb; int i; dma_addr_t dma_addr; for (i = 0; i < RX_RING_SIZE; i++) { struct gem_rxd *rxd; rxd = &gb->rxd[i]; if (gp->rx_skbs[i] != NULL) { skb = gp->rx_skbs[i]; dma_addr = le64_to_cpu(rxd->buffer); pci_unmap_page(gp->pdev, dma_addr, RX_BUF_ALLOC_SIZE(gp), PCI_DMA_FROMDEVICE); dev_kfree_skb_any(skb); gp->rx_skbs[i] = NULL; } rxd->status_word = 0; wmb(); rxd->buffer = 0; } for (i = 0; i < TX_RING_SIZE; i++) { if (gp->tx_skbs[i] != NULL) { struct gem_txd *txd; int frag; skb = gp->tx_skbs[i]; gp->tx_skbs[i] = NULL; for (frag = 0; frag <= skb_shinfo(skb)->nr_frags; frag++) { int ent = i & (TX_RING_SIZE - 1); txd = &gb->txd[ent]; dma_addr = le64_to_cpu(txd->buffer); pci_unmap_page(gp->pdev, dma_addr, le64_to_cpu(txd->control_word) & TXDCTRL_BUFSZ, PCI_DMA_TODEVICE); if (frag != skb_shinfo(skb)->nr_frags) i++; } dev_kfree_skb_any(skb); } } } /* Must be invoked under gp->lock and gp->tx_lock. */ static void gem_init_rings(struct gem *gp) { struct gem_init_block *gb = gp->init_block; struct net_device *dev = gp->dev; int i; dma_addr_t dma_addr; gp->rx_new = gp->rx_old = gp->tx_new = gp->tx_old = 0; gem_clean_rings(gp); gp->rx_buf_sz = max(dev->mtu + ETH_HLEN + VLAN_HLEN, (unsigned)VLAN_ETH_FRAME_LEN); for (i = 0; i < RX_RING_SIZE; i++) { struct sk_buff *skb; struct gem_rxd *rxd = &gb->rxd[i]; skb = gem_alloc_skb(RX_BUF_ALLOC_SIZE(gp), GFP_ATOMIC); if (!skb) { rxd->buffer = 0; rxd->status_word = 0; continue; } gp->rx_skbs[i] = skb; skb->dev = dev; skb_put(skb, (gp->rx_buf_sz + RX_OFFSET)); dma_addr = pci_map_page(gp->pdev, virt_to_page(skb->data), offset_in_page(skb->data), RX_BUF_ALLOC_SIZE(gp), PCI_DMA_FROMDEVICE); rxd->buffer = cpu_to_le64(dma_addr); wmb(); rxd->status_word = cpu_to_le64(RXDCTRL_FRESH(gp)); skb_reserve(skb, RX_OFFSET); } for (i = 0; i < TX_RING_SIZE; i++) { struct gem_txd *txd = &gb->txd[i]; txd->control_word = 0; wmb(); txd->buffer = 0; } wmb(); } /* Init PHY interface and start link poll state machine */ static void gem_init_phy(struct gem *gp) { u32 mifcfg; /* Revert MIF CFG setting done on stop_phy */ mifcfg = readl(gp->regs + MIF_CFG); mifcfg &= ~MIF_CFG_BBMODE; writel(mifcfg, gp->regs + MIF_CFG); if (gp->pdev->vendor == PCI_VENDOR_ID_APPLE) { int i; /* Those delay sucks, the HW seem to love them though, I'll * serisouly consider breaking some locks here to be able * to schedule instead */ for (i = 0; i < 3; i++) { #ifdef CONFIG_PPC_PMAC pmac_call_feature(PMAC_FTR_GMAC_PHY_RESET, gp->of_node, 0, 0); msleep(20); #endif /* Some PHYs used by apple have problem getting back to us, * we do an additional reset here */ phy_write(gp, MII_BMCR, BMCR_RESET); msleep(20); if (phy_read(gp, MII_BMCR) != 0xffff) break; if (i == 2) printk(KERN_WARNING "%s: GMAC PHY not responding !\n", gp->dev->name); } } if (gp->pdev->vendor == PCI_VENDOR_ID_SUN && gp->pdev->device == PCI_DEVICE_ID_SUN_GEM) { u32 val; /* Init datapath mode register. */ if (gp->phy_type == phy_mii_mdio0 || gp->phy_type == phy_mii_mdio1) { val = PCS_DMODE_MGM; } else if (gp->phy_type == phy_serialink) { val = PCS_DMODE_SM | PCS_DMODE_GMOE; } else { val = PCS_DMODE_ESM; } writel(val, gp->regs + PCS_DMODE); } if (gp->phy_type == phy_mii_mdio0 || gp->phy_type == phy_mii_mdio1) { // XXX check for errors mii_phy_probe(&gp->phy_mii, gp->mii_phy_addr); /* Init PHY */ if (gp->phy_mii.def && gp->phy_mii.def->ops->init) gp->phy_mii.def->ops->init(&gp->phy_mii); } else { gem_pcs_reset(gp); gem_pcs_reinit_adv(gp); } /* Default aneg parameters */ gp->timer_ticks = 0; gp->lstate = link_down; netif_carrier_off(gp->dev); /* Can I advertise gigabit here ? I'd need BCM PHY docs... */ spin_lock_irq(&gp->lock); gem_begin_auto_negotiation(gp, NULL); spin_unlock_irq(&gp->lock); } /* Must be invoked under gp->lock and gp->tx_lock. */ static void gem_init_dma(struct gem *gp) { u64 desc_dma = (u64) gp->gblock_dvma; u32 val; val = (TXDMA_CFG_BASE | (0x7ff << 10) | TXDMA_CFG_PMODE); writel(val, gp->regs + TXDMA_CFG); writel(desc_dma >> 32, gp->regs + TXDMA_DBHI); writel(desc_dma & 0xffffffff, gp->regs + TXDMA_DBLOW); desc_dma += (INIT_BLOCK_TX_RING_SIZE * sizeof(struct gem_txd)); writel(0, gp->regs + TXDMA_KICK); val = (RXDMA_CFG_BASE | (RX_OFFSET << 10) | ((14 / 2) << 13) | RXDMA_CFG_FTHRESH_128); writel(val, gp->regs + RXDMA_CFG); writel(desc_dma >> 32, gp->regs + RXDMA_DBHI); writel(desc_dma & 0xffffffff, gp->regs + RXDMA_DBLOW); writel(RX_RING_SIZE - 4, gp->regs + RXDMA_KICK); val = (((gp->rx_pause_off / 64) << 0) & RXDMA_PTHRESH_OFF); val |= (((gp->rx_pause_on / 64) << 12) & RXDMA_PTHRESH_ON); writel(val, gp->regs + RXDMA_PTHRESH); if (readl(gp->regs + GREG_BIFCFG) & GREG_BIFCFG_M66EN) writel(((5 & RXDMA_BLANK_IPKTS) | ((8 << 12) & RXDMA_BLANK_ITIME)), gp->regs + RXDMA_BLANK); else writel(((5 & RXDMA_BLANK_IPKTS) | ((4 << 12) & RXDMA_BLANK_ITIME)), gp->regs + RXDMA_BLANK); } /* Must be invoked under gp->lock and gp->tx_lock. */ static u32 gem_setup_multicast(struct gem *gp) { u32 rxcfg = 0; int i; if ((gp->dev->flags & IFF_ALLMULTI) || (gp->dev->mc_count > 256)) { for (i=0; i<16; i++) writel(0xffff, gp->regs + MAC_HASH0 + (i << 2)); rxcfg |= MAC_RXCFG_HFE; } else if (gp->dev->flags & IFF_PROMISC) { rxcfg |= MAC_RXCFG_PROM; } else { u16 hash_table[16]; u32 crc; struct dev_mc_list *dmi = gp->dev->mc_list; int i; for (i = 0; i < 16; i++) hash_table[i] = 0; for (i = 0; i < gp->dev->mc_count; i++) { char *addrs = dmi->dmi_addr; dmi = dmi->next; if (!(*addrs & 1)) continue; crc = ether_crc_le(6, addrs); crc >>= 24; hash_table[crc >> 4] |= 1 << (15 - (crc & 0xf)); } for (i=0; i<16; i++) writel(hash_table[i], gp->regs + MAC_HASH0 + (i << 2)); rxcfg |= MAC_RXCFG_HFE; } return rxcfg; } /* Must be invoked under gp->lock and gp->tx_lock. */ static void gem_init_mac(struct gem *gp) { unsigned char *e = &gp->dev->dev_addr[0]; writel(0x1bf0, gp->regs + MAC_SNDPAUSE); writel(0x00, gp->regs + MAC_IPG0); writel(0x08, gp->regs + MAC_IPG1); writel(0x04, gp->regs + MAC_IPG2); writel(0x40, gp->regs + MAC_STIME); writel(0x40, gp->regs + MAC_MINFSZ); /* Ethernet payload + header + FCS + optional VLAN tag. */ writel(0x20000000 | (gp->rx_buf_sz + 4), gp->regs + MAC_MAXFSZ); writel(0x07, gp->regs + MAC_PASIZE); writel(0x04, gp->regs + MAC_JAMSIZE); writel(0x10, gp->regs + MAC_ATTLIM); writel(0x8808, gp->regs + MAC_MCTYPE); writel((e[5] | (e[4] << 8)) & 0x3ff, gp->regs + MAC_RANDSEED); writel((e[4] << 8) | e[5], gp->regs + MAC_ADDR0); writel((e[2] << 8) | e[3], gp->regs + MAC_ADDR1); writel((e[0] << 8) | e[1], gp->regs + MAC_ADDR2); writel(0, gp->regs + MAC_ADDR3); writel(0, gp->regs + MAC_ADDR4); writel(0, gp->regs + MAC_ADDR5); writel(0x0001, gp->regs + MAC_ADDR6); writel(0xc200, gp->regs + MAC_ADDR7); writel(0x0180, gp->regs + MAC_ADDR8); writel(0, gp->regs + MAC_AFILT0); writel(0, gp->regs + MAC_AFILT1); writel(0, gp->regs + MAC_AFILT2); writel(0, gp->regs + MAC_AF21MSK); writel(0, gp->regs + MAC_AF0MSK); gp->mac_rx_cfg = gem_setup_multicast(gp); #ifdef STRIP_FCS gp->mac_rx_cfg |= MAC_RXCFG_SFCS; #endif writel(0, gp->regs + MAC_NCOLL); writel(0, gp->regs + MAC_FASUCC); writel(0, gp->regs + MAC_ECOLL); writel(0, gp->regs + MAC_LCOLL); writel(0, gp->regs + MAC_DTIMER); writel(0, gp->regs + MAC_PATMPS); writel(0, gp->regs + MAC_RFCTR); writel(0, gp->regs + MAC_LERR); writel(0, gp->regs + MAC_AERR); writel(0, gp->regs + MAC_FCSERR); writel(0, gp->regs + MAC_RXCVERR); /* Clear RX/TX/MAC/XIF config, we will set these up and enable * them once a link is established. */ writel(0, gp->regs + MAC_TXCFG); writel(gp->mac_rx_cfg, gp->regs + MAC_RXCFG); writel(0, gp->regs + MAC_MCCFG); writel(0, gp->regs + MAC_XIFCFG); /* Setup MAC interrupts. We want to get all of the interesting * counter expiration events, but we do not want to hear about * normal rx/tx as the DMA engine tells us that. */ writel(MAC_TXSTAT_XMIT, gp->regs + MAC_TXMASK); writel(MAC_RXSTAT_RCV, gp->regs + MAC_RXMASK); /* Don't enable even the PAUSE interrupts for now, we * make no use of those events other than to record them. */ writel(0xffffffff, gp->regs + MAC_MCMASK); /* Don't enable GEM's WOL in normal operations */ if (gp->has_wol) writel(0, gp->regs + WOL_WAKECSR); } /* Must be invoked under gp->lock and gp->tx_lock. */ static void gem_init_pause_thresholds(struct gem *gp) { u32 cfg; /* Calculate pause thresholds. Setting the OFF threshold to the * full RX fifo size effectively disables PAUSE generation which * is what we do for 10/100 only GEMs which have FIFOs too small * to make real gains from PAUSE. */ if (gp->rx_fifo_sz <= (2 * 1024)) { gp->rx_pause_off = gp->rx_pause_on = gp->rx_fifo_sz; } else { int max_frame = (gp->rx_buf_sz + 4 + 64) & ~63; int off = (gp->rx_fifo_sz - (max_frame * 2)); int on = off - max_frame; gp->rx_pause_off = off; gp->rx_pause_on = on; } /* Configure the chip "burst" DMA mode & enable some * HW bug fixes on Apple version */ cfg = 0; if (gp->pdev->vendor == PCI_VENDOR_ID_APPLE) cfg |= GREG_CFG_RONPAULBIT | GREG_CFG_ENBUG2FIX; #if !defined(CONFIG_SPARC64) && !defined(CONFIG_ALPHA) cfg |= GREG_CFG_IBURST; #endif cfg |= ((31 << 1) & GREG_CFG_TXDMALIM); cfg |= ((31 << 6) & GREG_CFG_RXDMALIM); writel(cfg, gp->regs + GREG_CFG); /* If Infinite Burst didn't stick, then use different * thresholds (and Apple bug fixes don't exist) */ if (!(readl(gp->regs + GREG_CFG) & GREG_CFG_IBURST)) { cfg = ((2 << 1) & GREG_CFG_TXDMALIM); cfg |= ((8 << 6) & GREG_CFG_RXDMALIM); writel(cfg, gp->regs + GREG_CFG); } } static int gem_check_invariants(struct gem *gp) { struct pci_dev *pdev = gp->pdev; u32 mif_cfg; /* On Apple's sungem, we can't rely on registers as the chip * was been powered down by the firmware. The PHY is looked * up later on. */ if (pdev->vendor == PCI_VENDOR_ID_APPLE) { gp->phy_type = phy_mii_mdio0; gp->tx_fifo_sz = readl(gp->regs + TXDMA_FSZ) * 64; gp->rx_fifo_sz = readl(gp->regs + RXDMA_FSZ) * 64; gp->swrst_base = 0; mif_cfg = readl(gp->regs + MIF_CFG); mif_cfg &= ~(MIF_CFG_PSELECT|MIF_CFG_POLL|MIF_CFG_BBMODE|MIF_CFG_MDI1); mif_cfg |= MIF_CFG_MDI0; writel(mif_cfg, gp->regs + MIF_CFG); writel(PCS_DMODE_MGM, gp->regs + PCS_DMODE); writel(MAC_XIFCFG_OE, gp->regs + MAC_XIFCFG); /* We hard-code the PHY address so we can properly bring it out of * reset later on, we can't really probe it at this point, though * that isn't an issue. */ if (gp->pdev->device == PCI_DEVICE_ID_APPLE_K2_GMAC) gp->mii_phy_addr = 1; else gp->mii_phy_addr = 0; return 0; } mif_cfg = readl(gp->regs + MIF_CFG); if (pdev->vendor == PCI_VENDOR_ID_SUN && pdev->device == PCI_DEVICE_ID_SUN_RIO_GEM) { /* One of the MII PHYs _must_ be present * as this chip has no gigabit PHY. */ if ((mif_cfg & (MIF_CFG_MDI0 | MIF_CFG_MDI1)) == 0) { printk(KERN_ERR PFX "RIO GEM lacks MII phy, mif_cfg[%08x]\n", mif_cfg); return -1; } } /* Determine initial PHY interface type guess. MDIO1 is the * external PHY and thus takes precedence over MDIO0. */ if (mif_cfg & MIF_CFG_MDI1) { gp->phy_type = phy_mii_mdio1; mif_cfg |= MIF_CFG_PSELECT; writel(mif_cfg, gp->regs + MIF_CFG); } else if (mif_cfg & MIF_CFG_MDI0) { gp->phy_type = phy_mii_mdio0; mif_cfg &= ~MIF_CFG_PSELECT; writel(mif_cfg, gp->regs + MIF_CFG); } else { gp->phy_type = phy_serialink; } if (gp->phy_type == phy_mii_mdio1 || gp->phy_type == phy_mii_mdio0) { int i; for (i = 0; i < 32; i++) { gp->mii_phy_addr = i; if (phy_read(gp, MII_BMCR) != 0xffff) break; } if (i == 32) { if (pdev->device != PCI_DEVICE_ID_SUN_GEM) { printk(KERN_ERR PFX "RIO MII phy will not respond.\n"); return -1; } gp->phy_type = phy_serdes; } } /* Fetch the FIFO configurations now too. */ gp->tx_fifo_sz = readl(gp->regs + TXDMA_FSZ) * 64; gp->rx_fifo_sz = readl(gp->regs + RXDMA_FSZ) * 64; if (pdev->vendor == PCI_VENDOR_ID_SUN) { if (pdev->device == PCI_DEVICE_ID_SUN_GEM) { if (gp->tx_fifo_sz != (9 * 1024) || gp->rx_fifo_sz != (20 * 1024)) { printk(KERN_ERR PFX "GEM has bogus fifo sizes tx(%d) rx(%d)\n", gp->tx_fifo_sz, gp->rx_fifo_sz); return -1; } gp->swrst_base = 0; } else { if (gp->tx_fifo_sz != (2 * 1024) || gp->rx_fifo_sz != (2 * 1024)) { printk(KERN_ERR PFX "RIO GEM has bogus fifo sizes tx(%d) rx(%d)\n", gp->tx_fifo_sz, gp->rx_fifo_sz); return -1; } gp->swrst_base = (64 / 4) << GREG_SWRST_CACHE_SHIFT; } } return 0; } /* Must be invoked under gp->lock and gp->tx_lock. */ static void gem_reinit_chip(struct gem *gp) { /* Reset the chip */ gem_reset(gp); /* Make sure ints are disabled */ gem_disable_ints(gp); /* Allocate & setup ring buffers */ gem_init_rings(gp); /* Configure pause thresholds */ gem_init_pause_thresholds(gp); /* Init DMA & MAC engines */ gem_init_dma(gp); gem_init_mac(gp); } /* Must be invoked with no lock held. */ static void gem_stop_phy(struct gem *gp, int wol) { u32 mifcfg; unsigned long flags; /* Let the chip settle down a bit, it seems that helps * for sleep mode on some models */ msleep(10); /* Make sure we aren't polling PHY status change. We * don't currently use that feature though */ mifcfg = readl(gp->regs + MIF_CFG); mifcfg &= ~MIF_CFG_POLL; writel(mifcfg, gp->regs + MIF_CFG); if (wol && gp->has_wol) { unsigned char *e = &gp->dev->dev_addr[0]; u32 csr; /* Setup wake-on-lan for MAGIC packet */ writel(MAC_RXCFG_HFE | MAC_RXCFG_SFCS | MAC_RXCFG_ENAB, gp->regs + MAC_RXCFG); writel((e[4] << 8) | e[5], gp->regs + WOL_MATCH0); writel((e[2] << 8) | e[3], gp->regs + WOL_MATCH1); writel((e[0] << 8) | e[1], gp->regs + WOL_MATCH2); writel(WOL_MCOUNT_N | WOL_MCOUNT_M, gp->regs + WOL_MCOUNT); csr = WOL_WAKECSR_ENABLE; if ((readl(gp->regs + MAC_XIFCFG) & MAC_XIFCFG_GMII) == 0) csr |= WOL_WAKECSR_MII; writel(csr, gp->regs + WOL_WAKECSR); } else { writel(0, gp->regs + MAC_RXCFG); (void)readl(gp->regs + MAC_RXCFG); /* Machine sleep will die in strange ways if we * dont wait a bit here, looks like the chip takes * some time to really shut down */ msleep(10); } writel(0, gp->regs + MAC_TXCFG); writel(0, gp->regs + MAC_XIFCFG); writel(0, gp->regs + TXDMA_CFG); writel(0, gp->regs + RXDMA_CFG); if (!wol) { spin_lock_irqsave(&gp->lock, flags); spin_lock(&gp->tx_lock); gem_reset(gp); writel(MAC_TXRST_CMD, gp->regs + MAC_TXRST); writel(MAC_RXRST_CMD, gp->regs + MAC_RXRST); spin_unlock(&gp->tx_lock); spin_unlock_irqrestore(&gp->lock, flags); /* No need to take the lock here */ if (found_mii_phy(gp) && gp->phy_mii.def->ops->suspend) gp->phy_mii.def->ops->suspend(&gp->phy_mii); /* According to Apple, we must set the MDIO pins to this begnign * state or we may 1) eat more current, 2) damage some PHYs */ writel(mifcfg | MIF_CFG_BBMODE, gp->regs + MIF_CFG); writel(0, gp->regs + MIF_BBCLK); writel(0, gp->regs + MIF_BBDATA); writel(0, gp->regs + MIF_BBOENAB); writel(MAC_XIFCFG_GMII | MAC_XIFCFG_LBCK, gp->regs + MAC_XIFCFG); (void) readl(gp->regs + MAC_XIFCFG); } } static int gem_do_start(struct net_device *dev) { struct gem *gp = netdev_priv(dev); unsigned long flags; spin_lock_irqsave(&gp->lock, flags); spin_lock(&gp->tx_lock); /* Enable the cell */ gem_get_cell(gp); /* Init & setup chip hardware */ gem_reinit_chip(gp); gp->running = 1; napi_enable(&gp->napi); if (gp->lstate == link_up) { netif_carrier_on(gp->dev); gem_set_link_modes(gp); } netif_wake_queue(gp->dev); spin_unlock(&gp->tx_lock); spin_unlock_irqrestore(&gp->lock, flags); if (request_irq(gp->pdev->irq, gem_interrupt, IRQF_SHARED, dev->name, (void *)dev)) { printk(KERN_ERR "%s: failed to request irq !\n", gp->dev->name); spin_lock_irqsave(&gp->lock, flags); spin_lock(&gp->tx_lock); napi_disable(&gp->napi); gp->running = 0; gem_reset(gp); gem_clean_rings(gp); gem_put_cell(gp); spin_unlock(&gp->tx_lock); spin_unlock_irqrestore(&gp->lock, flags); return -EAGAIN; } return 0; } static void gem_do_stop(struct net_device *dev, int wol) { struct gem *gp = netdev_priv(dev); unsigned long flags; spin_lock_irqsave(&gp->lock, flags); spin_lock(&gp->tx_lock); gp->running = 0; /* Stop netif queue */ netif_stop_queue(dev); /* Make sure ints are disabled */ gem_disable_ints(gp); /* We can drop the lock now */ spin_unlock(&gp->tx_lock); spin_unlock_irqrestore(&gp->lock, flags); /* If we are going to sleep with WOL */ gem_stop_dma(gp); msleep(10); if (!wol) gem_reset(gp); msleep(10); /* Get rid of rings */ gem_clean_rings(gp); /* No irq needed anymore */ free_irq(gp->pdev->irq, (void *) dev); /* Cell not needed neither if no WOL */ if (!wol) { spin_lock_irqsave(&gp->lock, flags); gem_put_cell(gp); spin_unlock_irqrestore(&gp->lock, flags); } } static void gem_reset_task(struct work_struct *work) { struct gem *gp = container_of(work, struct gem, reset_task); mutex_lock(&gp->pm_mutex); if (gp->opened) napi_disable(&gp->napi); spin_lock_irq(&gp->lock); spin_lock(&gp->tx_lock); if (gp->running) { netif_stop_queue(gp->dev); /* Reset the chip & rings */ gem_reinit_chip(gp); if (gp->lstate == link_up) gem_set_link_modes(gp); netif_wake_queue(gp->dev); } gp->reset_task_pending = 0; spin_unlock(&gp->tx_lock); spin_unlock_irq(&gp->lock); if (gp->opened) napi_enable(&gp->napi); mutex_unlock(&gp->pm_mutex); } static int gem_open(struct net_device *dev) { struct gem *gp = netdev_priv(dev); int rc = 0; mutex_lock(&gp->pm_mutex); /* We need the cell enabled */ if (!gp->asleep) rc = gem_do_start(dev); gp->opened = (rc == 0); mutex_unlock(&gp->pm_mutex); return rc; } static int gem_close(struct net_device *dev) { struct gem *gp = netdev_priv(dev); mutex_lock(&gp->pm_mutex); napi_disable(&gp->napi); gp->opened = 0; if (!gp->asleep) gem_do_stop(dev, 0); mutex_unlock(&gp->pm_mutex); return 0; } #ifdef CONFIG_PM static int gem_suspend(struct pci_dev *pdev, pm_message_t state) { struct net_device *dev = pci_get_drvdata(pdev); struct gem *gp = netdev_priv(dev); unsigned long flags; mutex_lock(&gp->pm_mutex); printk(KERN_INFO "%s: suspending, WakeOnLan %s\n", dev->name, (gp->wake_on_lan && gp->opened) ? "enabled" : "disabled"); /* Keep the cell enabled during the entire operation */ spin_lock_irqsave(&gp->lock, flags); spin_lock(&gp->tx_lock); gem_get_cell(gp); spin_unlock(&gp->tx_lock); spin_unlock_irqrestore(&gp->lock, flags); /* If the driver is opened, we stop the MAC */ if (gp->opened) { napi_disable(&gp->napi); /* Stop traffic, mark us closed */ netif_device_detach(dev); /* Switch off MAC, remember WOL setting */ gp->asleep_wol = gp->wake_on_lan; gem_do_stop(dev, gp->asleep_wol); } else gp->asleep_wol = 0; /* Mark us asleep */ gp->asleep = 1; wmb(); /* Stop the link timer */ del_timer_sync(&gp->link_timer); /* Now we release the mutex to not block the reset task who * can take it too. We are marked asleep, so there will be no * conflict here */ mutex_unlock(&gp->pm_mutex); /* Wait for a pending reset task to complete */ while (gp->reset_task_pending) yield(); flush_scheduled_work(); /* Shut the PHY down eventually and setup WOL */ gem_stop_phy(gp, gp->asleep_wol); /* Make sure bus master is disabled */ pci_disable_device(gp->pdev); /* Release the cell, no need to take a lock at this point since * nothing else can happen now */ gem_put_cell(gp); return 0; } static int gem_resume(struct pci_dev *pdev) { struct net_device *dev = pci_get_drvdata(pdev); struct gem *gp = netdev_priv(dev); unsigned long flags; printk(KERN_INFO "%s: resuming\n", dev->name); mutex_lock(&gp->pm_mutex); /* Keep the cell enabled during the entire operation, no need to * take a lock here tho since nothing else can happen while we are * marked asleep */ gem_get_cell(gp); /* Make sure PCI access and bus master are enabled */ if (pci_enable_device(gp->pdev)) { printk(KERN_ERR "%s: Can't re-enable chip !\n", dev->name); /* Put cell and forget it for now, it will be considered as * still asleep, a new sleep cycle may bring it back */ gem_put_cell(gp); mutex_unlock(&gp->pm_mutex); return 0; } pci_set_master(gp->pdev); /* Reset everything */ gem_reset(gp); /* Mark us woken up */ gp->asleep = 0; wmb(); /* Bring the PHY back. Again, lock is useless at this point as * nothing can be happening until we restart the whole thing */ gem_init_phy(gp); /* If we were opened, bring everything back */ if (gp->opened) { /* Restart MAC */ gem_do_start(dev); /* Re-attach net device */ netif_device_attach(dev); } spin_lock_irqsave(&gp->lock, flags); spin_lock(&gp->tx_lock); /* If we had WOL enabled, the cell clock was never turned off during * sleep, so we end up beeing unbalanced. Fix that here */ if (gp->asleep_wol) gem_put_cell(gp); /* This function doesn't need to hold the cell, it will be held if the * driver is open by gem_do_start(). */ gem_put_cell(gp); spin_unlock(&gp->tx_lock); spin_unlock_irqrestore(&gp->lock, flags); mutex_unlock(&gp->pm_mutex); return 0; } #endif /* CONFIG_PM */ static struct net_device_stats *gem_get_stats(struct net_device *dev) { struct gem *gp = netdev_priv(dev); struct net_device_stats *stats = &gp->net_stats; spin_lock_irq(&gp->lock); spin_lock(&gp->tx_lock); /* I have seen this being called while the PM was in progress, * so we shield against this */ if (gp->running) { stats->rx_crc_errors += readl(gp->regs + MAC_FCSERR); writel(0, gp->regs + MAC_FCSERR); stats->rx_frame_errors += readl(gp->regs + MAC_AERR); writel(0, gp->regs + MAC_AERR); stats->rx_length_errors += readl(gp->regs + MAC_LERR); writel(0, gp->regs + MAC_LERR); stats->tx_aborted_errors += readl(gp->regs + MAC_ECOLL); stats->collisions += (readl(gp->regs + MAC_ECOLL) + readl(gp->regs + MAC_LCOLL)); writel(0, gp->regs + MAC_ECOLL); writel(0, gp->regs + MAC_LCOLL); } spin_unlock(&gp->tx_lock); spin_unlock_irq(&gp->lock); return &gp->net_stats; } static int gem_set_mac_address(struct net_device *dev, void *addr) { struct sockaddr *macaddr = (struct sockaddr *) addr; struct gem *gp = netdev_priv(dev); unsigned char *e = &dev->dev_addr[0]; if (!is_valid_ether_addr(macaddr->sa_data)) return -EADDRNOTAVAIL; if (!netif_running(dev) || !netif_device_present(dev)) { /* We'll just catch it later when the * device is up'd or resumed. */ memcpy(dev->dev_addr, macaddr->sa_data, dev->addr_len); return 0; } mutex_lock(&gp->pm_mutex); memcpy(dev->dev_addr, macaddr->sa_data, dev->addr_len); if (gp->running) { writel((e[4] << 8) | e[5], gp->regs + MAC_ADDR0); writel((e[2] << 8) | e[3], gp->regs + MAC_ADDR1); writel((e[0] << 8) | e[1], gp->regs + MAC_ADDR2); } mutex_unlock(&gp->pm_mutex); return 0; } static void gem_set_multicast(struct net_device *dev) { struct gem *gp = netdev_priv(dev); u32 rxcfg, rxcfg_new; int limit = 10000; spin_lock_irq(&gp->lock); spin_lock(&gp->tx_lock); if (!gp->running) goto bail; netif_stop_queue(dev); rxcfg = readl(gp->regs + MAC_RXCFG); rxcfg_new = gem_setup_multicast(gp); #ifdef STRIP_FCS rxcfg_new |= MAC_RXCFG_SFCS; #endif gp->mac_rx_cfg = rxcfg_new; writel(rxcfg & ~MAC_RXCFG_ENAB, gp->regs + MAC_RXCFG); while (readl(gp->regs + MAC_RXCFG) & MAC_RXCFG_ENAB) { if (!limit--) break; udelay(10); } rxcfg &= ~(MAC_RXCFG_PROM | MAC_RXCFG_HFE); rxcfg |= rxcfg_new; writel(rxcfg, gp->regs + MAC_RXCFG); netif_wake_queue(dev); bail: spin_unlock(&gp->tx_lock); spin_unlock_irq(&gp->lock); } /* Jumbo-grams don't seem to work :-( */ #define GEM_MIN_MTU 68 #if 1 #define GEM_MAX_MTU 1500 #else #define GEM_MAX_MTU 9000 #endif static int gem_change_mtu(struct net_device *dev, int new_mtu) { struct gem *gp = netdev_priv(dev); if (new_mtu < GEM_MIN_MTU || new_mtu > GEM_MAX_MTU) return -EINVAL; if (!netif_running(dev) || !netif_device_present(dev)) { /* We'll just catch it later when the * device is up'd or resumed. */ dev->mtu = new_mtu; return 0; } mutex_lock(&gp->pm_mutex); spin_lock_irq(&gp->lock); spin_lock(&gp->tx_lock); dev->mtu = new_mtu; if (gp->running) { gem_reinit_chip(gp); if (gp->lstate == link_up) gem_set_link_modes(gp); } spin_unlock(&gp->tx_lock); spin_unlock_irq(&gp->lock); mutex_unlock(&gp->pm_mutex); return 0; } static void gem_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) { struct gem *gp = netdev_priv(dev); strcpy(info->driver, DRV_NAME); strcpy(info->version, DRV_VERSION); strcpy(info->bus_info, pci_name(gp->pdev)); } static int gem_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) { struct gem *gp = netdev_priv(dev); if (gp->phy_type == phy_mii_mdio0 || gp->phy_type == phy_mii_mdio1) { if (gp->phy_mii.def) cmd->supported = gp->phy_mii.def->features; else cmd->supported = (SUPPORTED_10baseT_Half | SUPPORTED_10baseT_Full); /* XXX hardcoded stuff for now */ cmd->port = PORT_MII; cmd->transceiver = XCVR_EXTERNAL; cmd->phy_address = 0; /* XXX fixed PHYAD */ /* Return current PHY settings */ spin_lock_irq(&gp->lock); cmd->autoneg = gp->want_autoneg; cmd->speed = gp->phy_mii.speed; cmd->duplex = gp->phy_mii.duplex; cmd->advertising = gp->phy_mii.advertising; /* If we started with a forced mode, we don't have a default * advertise set, we need to return something sensible so * userland can re-enable autoneg properly. */ if (cmd->advertising == 0) cmd->advertising = cmd->supported; spin_unlock_irq(&gp->lock); } else { // XXX PCS ? cmd->supported = (SUPPORTED_10baseT_Half | SUPPORTED_10baseT_Full | SUPPORTED_100baseT_Half | SUPPORTED_100baseT_Full | SUPPORTED_Autoneg); cmd->advertising = cmd->supported; cmd->speed = 0; cmd->duplex = cmd->port = cmd->phy_address = cmd->transceiver = cmd->autoneg = 0; /* serdes means usually a Fibre connector, with most fixed */ if (gp->phy_type == phy_serdes) { cmd->port = PORT_FIBRE; cmd->supported = (SUPPORTED_1000baseT_Half | SUPPORTED_1000baseT_Full | SUPPORTED_FIBRE | SUPPORTED_Autoneg | SUPPORTED_Pause | SUPPORTED_Asym_Pause); cmd->advertising = cmd->supported; cmd->transceiver = XCVR_INTERNAL; if (gp->lstate == link_up) cmd->speed = SPEED_1000; cmd->duplex = DUPLEX_FULL; cmd->autoneg = 1; } } cmd->maxtxpkt = cmd->maxrxpkt = 0; return 0; } static int gem_set_settings(struct net_device *dev, struct ethtool_cmd *cmd) { struct gem *gp = netdev_priv(dev); /* Verify the settings we care about. */ if (cmd->autoneg != AUTONEG_ENABLE && cmd->autoneg != AUTONEG_DISABLE) return -EINVAL; if (cmd->autoneg == AUTONEG_ENABLE && cmd->advertising == 0) return -EINVAL; if (cmd->autoneg == AUTONEG_DISABLE && ((cmd->speed != SPEED_1000 && cmd->speed != SPEED_100 && cmd->speed != SPEED_10) || (cmd->duplex != DUPLEX_HALF && cmd->duplex != DUPLEX_FULL))) return -EINVAL; /* Apply settings and restart link process. */ spin_lock_irq(&gp->lock); gem_get_cell(gp); gem_begin_auto_negotiation(gp, cmd); gem_put_cell(gp); spin_unlock_irq(&gp->lock); return 0; } static int gem_nway_reset(struct net_device *dev) { struct gem *gp = netdev_priv(dev); if (!gp->want_autoneg) return -EINVAL; /* Restart link process. */ spin_lock_irq(&gp->lock); gem_get_cell(gp); gem_begin_auto_negotiation(gp, NULL); gem_put_cell(gp); spin_unlock_irq(&gp->lock); return 0; } static u32 gem_get_msglevel(struct net_device *dev) { struct gem *gp = netdev_priv(dev); return gp->msg_enable; } static void gem_set_msglevel(struct net_device *dev, u32 value) { struct gem *gp = netdev_priv(dev); gp->msg_enable = value; } /* Add more when I understand how to program the chip */ /* like WAKE_UCAST | WAKE_MCAST | WAKE_BCAST */ #define WOL_SUPPORTED_MASK (WAKE_MAGIC) static void gem_get_wol(struct net_device *dev, struct ethtool_wolinfo *wol) { struct gem *gp = netdev_priv(dev); /* Add more when I understand how to program the chip */ if (gp->has_wol) { wol->supported = WOL_SUPPORTED_MASK; wol->wolopts = gp->wake_on_lan; } else { wol->supported = 0; wol->wolopts = 0; } } static int gem_set_wol(struct net_device *dev, struct ethtool_wolinfo *wol) { struct gem *gp = netdev_priv(dev); if (!gp->has_wol) return -EOPNOTSUPP; gp->wake_on_lan = wol->wolopts & WOL_SUPPORTED_MASK; return 0; } static const struct ethtool_ops gem_ethtool_ops = { .get_drvinfo = gem_get_drvinfo, .get_link = ethtool_op_get_link, .get_settings = gem_get_settings, .set_settings = gem_set_settings, .nway_reset = gem_nway_reset, .get_msglevel = gem_get_msglevel, .set_msglevel = gem_set_msglevel, .get_wol = gem_get_wol, .set_wol = gem_set_wol, }; static int gem_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) { struct gem *gp = netdev_priv(dev); struct mii_ioctl_data *data = if_mii(ifr); int rc = -EOPNOTSUPP; unsigned long flags; /* Hold the PM mutex while doing ioctl's or we may collide * with power management. */ mutex_lock(&gp->pm_mutex); spin_lock_irqsave(&gp->lock, flags); gem_get_cell(gp); spin_unlock_irqrestore(&gp->lock, flags); switch (cmd) { case SIOCGMIIPHY: /* Get address of MII PHY in use. */ data->phy_id = gp->mii_phy_addr; /* Fallthrough... */ case SIOCGMIIREG: /* Read MII PHY register. */ if (!gp->running) rc = -EAGAIN; else { data->val_out = __phy_read(gp, data->phy_id & 0x1f, data->reg_num & 0x1f); rc = 0; } break; case SIOCSMIIREG: /* Write MII PHY register. */ if (!capable(CAP_NET_ADMIN)) rc = -EPERM; else if (!gp->running) rc = -EAGAIN; else { __phy_write(gp, data->phy_id & 0x1f, data->reg_num & 0x1f, data->val_in); rc = 0; } break; }; spin_lock_irqsave(&gp->lock, flags); gem_put_cell(gp); spin_unlock_irqrestore(&gp->lock, flags); mutex_unlock(&gp->pm_mutex); return rc; } #if (!defined(CONFIG_SPARC) && !defined(CONFIG_PPC_PMAC)) /* Fetch MAC address from vital product data of PCI ROM. */ static int find_eth_addr_in_vpd(void __iomem *rom_base, int len, unsigned char *dev_addr) { int this_offset; for (this_offset = 0x20; this_offset < len; this_offset++) { void __iomem *p = rom_base + this_offset; int i; if (readb(p + 0) != 0x90 || readb(p + 1) != 0x00 || readb(p + 2) != 0x09 || readb(p + 3) != 0x4e || readb(p + 4) != 0x41 || readb(p + 5) != 0x06) continue; this_offset += 6; p += 6; for (i = 0; i < 6; i++) dev_addr[i] = readb(p + i); return 1; } return 0; } static void get_gem_mac_nonobp(struct pci_dev *pdev, unsigned char *dev_addr) { size_t size; void __iomem *p = pci_map_rom(pdev, &size); if (p) { int found; found = readb(p) == 0x55 && readb(p + 1) == 0xaa && find_eth_addr_in_vpd(p, (64 * 1024), dev_addr); pci_unmap_rom(pdev, p); if (found) return; } /* Sun MAC prefix then 3 random bytes. */ dev_addr[0] = 0x08; dev_addr[1] = 0x00; dev_addr[2] = 0x20; get_random_bytes(dev_addr + 3, 3); return; } #endif /* not Sparc and not PPC */ static int __devinit gem_get_device_address(struct gem *gp) { #if defined(CONFIG_SPARC) || defined(CONFIG_PPC_PMAC) struct net_device *dev = gp->dev; const unsigned char *addr; addr = of_get_property(gp->of_node, "local-mac-address", NULL); if (addr == NULL) { #ifdef CONFIG_SPARC addr = idprom->id_ethaddr; #else printk("\n"); printk(KERN_ERR "%s: can't get mac-address\n", dev->name); return -1; #endif } memcpy(dev->dev_addr, addr, 6); #else get_gem_mac_nonobp(gp->pdev, gp->dev->dev_addr); #endif return 0; } static void gem_remove_one(struct pci_dev *pdev) { struct net_device *dev = pci_get_drvdata(pdev); if (dev) { struct gem *gp = netdev_priv(dev); unregister_netdev(dev); /* Stop the link timer */ del_timer_sync(&gp->link_timer); /* We shouldn't need any locking here */ gem_get_cell(gp); /* Wait for a pending reset task to complete */ while (gp->reset_task_pending) yield(); flush_scheduled_work(); /* Shut the PHY down */ gem_stop_phy(gp, 0); gem_put_cell(gp); /* Make sure bus master is disabled */ pci_disable_device(gp->pdev); /* Free resources */ pci_free_consistent(pdev, sizeof(struct gem_init_block), gp->init_block, gp->gblock_dvma); iounmap(gp->regs); pci_release_regions(pdev); free_netdev(dev); pci_set_drvdata(pdev, NULL); } } static const struct net_device_ops gem_netdev_ops = { .ndo_open = gem_open, .ndo_stop = gem_close, .ndo_start_xmit = gem_start_xmit, .ndo_get_stats = gem_get_stats, .ndo_set_multicast_list = gem_set_multicast, .ndo_do_ioctl = gem_ioctl, .ndo_tx_timeout = gem_tx_timeout, .ndo_change_mtu = gem_change_mtu, .ndo_set_mac_address = eth_mac_addr, .ndo_validate_addr = eth_validate_addr, }; static int __devinit gem_init_one(struct pci_dev *pdev, const struct pci_device_id *ent) { static int gem_version_printed = 0; unsigned long gemreg_base, gemreg_len; struct net_device *dev; struct gem *gp; int err, pci_using_dac; if (gem_version_printed++ == 0) printk(KERN_INFO "%s", version); /* Apple gmac note: during probe, the chip is powered up by * the arch code to allow the code below to work (and to let * the chip be probed on the config space. It won't stay powered * up until the interface is brought up however, so we can't rely * on register configuration done at this point. */ err = pci_enable_device(pdev); if (err) { printk(KERN_ERR PFX "Cannot enable MMIO operation, " "aborting.\n"); return err; } pci_set_master(pdev); /* Configure DMA attributes. */ /* All of the GEM documentation states that 64-bit DMA addressing * is fully supported and should work just fine. However the * front end for RIO based GEMs is different and only supports * 32-bit addressing. * * For now we assume the various PPC GEMs are 32-bit only as well. */ if (pdev->vendor == PCI_VENDOR_ID_SUN && pdev->device == PCI_DEVICE_ID_SUN_GEM && !pci_set_dma_mask(pdev, DMA_64BIT_MASK)) { pci_using_dac = 1; } else { err = pci_set_dma_mask(pdev, DMA_32BIT_MASK); if (err) { printk(KERN_ERR PFX "No usable DMA configuration, " "aborting.\n"); goto err_disable_device; } pci_using_dac = 0; } gemreg_base = pci_resource_start(pdev, 0); gemreg_len = pci_resource_len(pdev, 0); if ((pci_resource_flags(pdev, 0) & IORESOURCE_IO) != 0) { printk(KERN_ERR PFX "Cannot find proper PCI device " "base address, aborting.\n"); err = -ENODEV; goto err_disable_device; } dev = alloc_etherdev(sizeof(*gp)); if (!dev) { printk(KERN_ERR PFX "Etherdev alloc failed, aborting.\n"); err = -ENOMEM; goto err_disable_device; } SET_NETDEV_DEV(dev, &pdev->dev); gp = netdev_priv(dev); err = pci_request_regions(pdev, DRV_NAME); if (err) { printk(KERN_ERR PFX "Cannot obtain PCI resources, " "aborting.\n"); goto err_out_free_netdev; } gp->pdev = pdev; dev->base_addr = (long) pdev; gp->dev = dev; gp->msg_enable = DEFAULT_MSG; spin_lock_init(&gp->lock); spin_lock_init(&gp->tx_lock); mutex_init(&gp->pm_mutex); init_timer(&gp->link_timer); gp->link_timer.function = gem_link_timer; gp->link_timer.data = (unsigned long) gp; INIT_WORK(&gp->reset_task, gem_reset_task); gp->lstate = link_down; gp->timer_ticks = 0; netif_carrier_off(dev); gp->regs = ioremap(gemreg_base, gemreg_len); if (!gp->regs) { printk(KERN_ERR PFX "Cannot map device registers, " "aborting.\n"); err = -EIO; goto err_out_free_res; } /* On Apple, we want a reference to the Open Firmware device-tree * node. We use it for clock control. */ #if defined(CONFIG_PPC_PMAC) || defined(CONFIG_SPARC) gp->of_node = pci_device_to_OF_node(pdev); #endif /* Only Apple version supports WOL afaik */ if (pdev->vendor == PCI_VENDOR_ID_APPLE) gp->has_wol = 1; /* Make sure cell is enabled */ gem_get_cell(gp); /* Make sure everything is stopped and in init state */ gem_reset(gp); /* Fill up the mii_phy structure (even if we won't use it) */ gp->phy_mii.dev = dev; gp->phy_mii.mdio_read = _phy_read; gp->phy_mii.mdio_write = _phy_write; #ifdef CONFIG_PPC_PMAC gp->phy_mii.platform_data = gp->of_node; #endif /* By default, we start with autoneg */ gp->want_autoneg = 1; /* Check fifo sizes, PHY type, etc... */ if (gem_check_invariants(gp)) { err = -ENODEV; goto err_out_iounmap; } /* It is guaranteed that the returned buffer will be at least * PAGE_SIZE aligned. */ gp->init_block = (struct gem_init_block *) pci_alloc_consistent(pdev, sizeof(struct gem_init_block), &gp->gblock_dvma); if (!gp->init_block) { printk(KERN_ERR PFX "Cannot allocate init block, " "aborting.\n"); err = -ENOMEM; goto err_out_iounmap; } if (gem_get_device_address(gp)) goto err_out_free_consistent; dev->netdev_ops = &gem_netdev_ops; netif_napi_add(dev, &gp->napi, gem_poll, 64); dev->ethtool_ops = &gem_ethtool_ops; dev->watchdog_timeo = 5 * HZ; dev->irq = pdev->irq; dev->dma = 0; dev->set_mac_address = gem_set_mac_address; #ifdef CONFIG_NET_POLL_CONTROLLER dev->poll_controller = gem_poll_controller; #endif /* Set that now, in case PM kicks in now */ pci_set_drvdata(pdev, dev); /* Detect & init PHY, start autoneg, we release the cell now * too, it will be managed by whoever needs it */ gem_init_phy(gp); spin_lock_irq(&gp->lock); gem_put_cell(gp); spin_unlock_irq(&gp->lock); /* Register with kernel */ if (register_netdev(dev)) { printk(KERN_ERR PFX "Cannot register net device, " "aborting.\n"); err = -ENOMEM; goto err_out_free_consistent; } printk(KERN_INFO "%s: Sun GEM (PCI) 10/100/1000BaseT Ethernet %pM\n", dev->name, dev->dev_addr); if (gp->phy_type == phy_mii_mdio0 || gp->phy_type == phy_mii_mdio1) printk(KERN_INFO "%s: Found %s PHY\n", dev->name, gp->phy_mii.def ? gp->phy_mii.def->name : "no"); /* GEM can do it all... */ dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_LLTX; if (pci_using_dac) dev->features |= NETIF_F_HIGHDMA; return 0; err_out_free_consistent: gem_remove_one(pdev); err_out_iounmap: gem_put_cell(gp); iounmap(gp->regs); err_out_free_res: pci_release_regions(pdev); err_out_free_netdev: free_netdev(dev); err_disable_device: pci_disable_device(pdev); return err; } static struct pci_driver gem_driver = { .name = GEM_MODULE_NAME, .id_table = gem_pci_tbl, .probe = gem_init_one, .remove = gem_remove_one, #ifdef CONFIG_PM .suspend = gem_suspend, .resume = gem_resume, #endif /* CONFIG_PM */ }; static int __init gem_init(void) { return pci_register_driver(&gem_driver); } static void __exit gem_cleanup(void) { pci_unregister_driver(&gem_driver); } module_init(gem_init); module_exit(gem_cleanup);