Minor update to the winbond-840 driver:
* improved SMP locking, one or 2 races fixed.
* memory leak in _close fixed.
* partial implementation of _suspend and _resume. The chip is disabled
and restarted, but not yet put into sleep mode. [lack of hardware to
test it]
-- Manfred
--- 2.4/drivers/net/winbond-840.c Fri Apr 20 20:54:23 2001 +++ build-2.4/drivers/net/winbond-840.c Sat May 19 14:14:22 2001 @@ -32,10 +32,16 @@ synchronize tx_q_bytes software reset in tx_timeout Copyright (C) 2000 Manfred Spraul + * further cleanups + power management. + Copyright (c) 2001 Manfred Spraul TODO: * according to the documentation, the chip supports big endian descriptors. Remove cpu_to_le32, enable BE descriptors. + * figure out why FreeBSD doesn't need the FIFO workaround + * Implement the HasACPI block + * Wake-On-LAN */ /* Automatically extracted configuration info: @@ -122,13 +128,14 @@ #include <linux/skbuff.h> #include <linux/init.h> #include <linux/delay.h> +#include <linux/rtnetlink.h> #include <asm/processor.h> /* Processor type for cache alignment. */ #include <asm/bitops.h> #include <asm/io.h> /* These identify the driver base version and may not be removed. */ static char version[] __devinitdata = -KERN_INFO "winbond-840.c:v1.01 (2.4 port) 5/15/2000 Donald Becker <becker@scyld.com>\n" +KERN_INFO "winbond-840.c:v1.01.m2 5/15/2000 Donald Becker <becker@scyld.com>\n" KERN_INFO " http://www.scyld.com/network/drivers.html\n"; MODULE_AUTHOR("Donald Becker <becker@scyld.com>"); @@ -198,7 +205,7 @@ PCI_ADDR_64BITS=0x100, PCI_NO_ACPI_WAKE=0x200, PCI_NO_MIN_LATENCY=0x400, }; enum chip_capability_flags { - CanHaveMII=1, HasBrokenTx=2, AlwaysFDX=4, FDXOnNoMII=8,}; + CanHaveMII=1, HasBrokenTx=2, AlwaysFDX=4, FDXOnNoMII=8,HasACPI=16}; #ifdef USE_IO_OPS #define W840_FLAGS (PCI_USES_IO | PCI_ADDR0 | PCI_USES_MASTER) #else @@ -302,7 +309,7 @@ struct w840_tx_desc { s32 status; s32 length; - u32 buffer1, buffer2; /* We use only buffer 1. */ + u32 buffer1, buffer2; }; /* Bits in network_desc.status */ @@ -340,8 +347,7 @@ /* These values are keep track of the transceiver/media in use. */ unsigned int full_duplex:1; /* Full-duplex operation requested. */ unsigned int duplex_lock:1; - unsigned int medialock:1; /* Do not sense media. */ - unsigned int default_port:4; /* Last dev->if_port value. */ + int dev_suspended; /* MII transceiver section. */ int mii_cnt; /* MII device addresses. */ u16 advertising; /* NWay media advertisement */ @@ -352,13 +358,14 @@ static int mdio_read(struct net_device *dev, int phy_id, int location); static void mdio_write(struct net_device *dev, int phy_id, int location, int value); static int netdev_open(struct net_device *dev); -static void check_duplex(struct net_device *dev); +static int update_link(struct net_device *dev); static void netdev_timer(unsigned long data); static void init_rxtx_rings(struct net_device *dev); static void free_rxtx_rings(struct netdev_private *np); static void init_registers(struct net_device *dev); static void tx_timeout(struct net_device *dev); -static int alloc_ring(struct net_device *dev); +static int alloc_ringdesc(struct net_device *dev); +static void free_ringdesc(struct netdev_private *np); static int start_tx(struct sk_buff *skb, struct net_device *dev); static void intr_handler(int irq, void *dev_instance, struct pt_regs *regs); static void netdev_error(struct net_device *dev, int intr_status); @@ -427,6 +434,7 @@ np->chip_id = chip_idx; np->drv_flags = pci_id_tbl[chip_idx].drv_flags; spin_lock_init(&np->lock); + np->dev_suspended = 0; pci_set_drvdata(pdev, dev); @@ -437,9 +445,9 @@ if (option > 0) { if (option & 0x200) np->full_duplex = 1; - np->default_port = option & 15; - if (np->default_port) - np->medialock = 1; + if (option & 15) + printk(KERN_INFO "%s: ignoring user supplied media type %d", + dev->name, option & 15); } if (find_cnt < MAX_UNITS && full_duplex[find_cnt] > 0) np->full_duplex = 1; @@ -667,7 +675,7 @@ printk(KERN_DEBUG "%s: w89c840_open() irq %d.\n", dev->name, dev->irq); - if((i=alloc_ring(dev))) + if((i=alloc_ringdesc(dev))) return i; init_registers(dev); @@ -678,7 +686,7 @@ /* Set the timer to check for link beat. */ init_timer(&np->timer); - np->timer.expires = jiffies + 3*HZ; + np->timer.expires = jiffies + 1*HZ; np->timer.data = (unsigned long)dev; np->timer.function = &netdev_timer; /* timer handler */ add_timer(&np->timer); @@ -686,25 +694,88 @@ return 0; } -static void check_duplex(struct net_device *dev) +static int update_link(struct net_device *dev) { struct netdev_private *np = dev->priv; - int mii_reg5 = mdio_read(dev, np->phys[0], 5); - int negotiated = mii_reg5 & np->advertising; - int duplex; + int negotiated, duplex, fasteth, result, mii_reg; - if (np->duplex_lock || mii_reg5 == 0xffff) + /* BSMR */ + mii_reg = mdio_read(dev, np->phys[0], 1); + + if (mii_reg == 0xffff) + return np->csr6; + /* reread: the link status bit is sticky */ + mii_reg = mdio_read(dev, np->phys[0], 1); + + if (!mii_reg & 0x4) { + if (netif_carrier_ok(dev)) { + printk(KERN_INFO "%s: MII #%d reports no link. Disabling watchdog.\n", + dev->name, np->phys[0]); + netif_carrier_off(dev); + } + return np->csr6; + } + if (!netif_carrier_ok(dev)) { + printk(KERN_INFO "%s: MII #%d link is back. Enabling watchdog.\n", + dev->name, np->phys[0]); + netif_carrier_on(dev); + } + + mii_reg = mdio_read(dev, np->phys[0], 5); + negotiated = mii_reg & np->advertising; + + /* remove fastether and fullduplex */ + result = np->csr6 & ~0x20000200; + + duplex = np->duplex_lock || (negotiated & 0x0100) || ((negotiated & 0x02C0) == 0x0040); + if (duplex) + result |= 0x200; + + fasteth = negotiated & 0x380; + if (fasteth) + result |= 0x20000000; + if (result != np->csr6 && debug) + printk(KERN_INFO "%s: Setting %s-duplex based on MII #%d " + "negotiated capability %4.4x.\n", dev->name, + duplex ? "full" : "half", np->phys[0], negotiated); + return result; +} + +#define RXTX_TIMEOUT 2000 +static inline void update_csr6(struct net_device *dev, int new) +{ + struct netdev_private *np = dev->priv; + long ioaddr = dev->base_addr; + int limit = RXTX_TIMEOUT; + + if (new==np->csr6) return; - duplex = (negotiated & 0x0100) || (negotiated & 0x01C0) == 0x0040; - if (np->full_duplex != duplex) { - np->full_duplex = duplex; - if (debug) - printk(KERN_INFO "%s: Setting %s-duplex based on MII #%d " - "negotiated capability %4.4x.\n", dev->name, - duplex ? "full" : "half", np->phys[0], negotiated); - np->csr6 &= ~0x200; - np->csr6 |= duplex ? 0x200 : 0; + /* stop both Tx and Rx processes */ + writel(np->csr6 & ~0x2002, ioaddr + NetworkConfig); + /* wait until they have really stopped */ + for (;;) { + int csr5 = readl(ioaddr + IntrStatus); + int t; + + t = (csr5 >> 17) & 0x07; + if (t==0||t==1) { + /* rx stopped */ + t = (csr5 >> 20) & 0x07; + if (t==0||t==1) + break; + } + + limit--; + if(!limit) { + printk(KERN_INFO "%s: couldn't stop rxtx, IntrStatus %xh.\n", + dev->name, csr5); + break; + } + udelay(1); } + np->csr6 = new; + /* and restart them with the new configuration */ + writel(np->csr6, ioaddr + NetworkConfig); } static void netdev_timer(unsigned long data) @@ -712,8 +783,6 @@ struct net_device *dev = (struct net_device *)data; struct netdev_private *np = dev->priv; long ioaddr = dev->base_addr; - int next_tick = 10*HZ; - int old_csr6 = np->csr6; if (debug > 2) printk(KERN_DEBUG "%s: Media selection timer tick, status %8.8x " @@ -721,13 +790,9 @@ dev->name, (int)readl(ioaddr + IntrStatus), (int)readl(ioaddr + NetworkConfig)); spin_lock_irq(&np->lock); - check_duplex(dev); - if (np->csr6 != old_csr6) { - writel(np->csr6 & ~0x0002, ioaddr + NetworkConfig); - writel(np->csr6 | 0x2002, ioaddr + NetworkConfig); - } + update_csr6(dev, update_link(dev)); spin_unlock_irq(&np->lock); - np->timer.expires = jiffies + next_tick; + np->timer.expires = jiffies + 10*HZ; add_timer(&np->timer); } @@ -847,19 +912,20 @@ #warning Processor architecture undefined! #endif - if (dev->if_port == 0) - dev->if_port = np->default_port; - - /* Fast Ethernet; 128 byte Tx threshold; + /* 128 byte Tx threshold; Transmit on; Receive on; */ - np->csr6 = 0x20022002; - check_duplex(dev); - set_rx_mode(dev); - writel(0, ioaddr + RxStartDemand); + np->csr6 = 0x00022002; + update_link(dev); /* Clear and Enable interrupts by setting the interrupt mask. */ + /* But defer interrupt processing until everything is set up */ + disable_irq(dev->irq); writel(0x1A0F5, ioaddr + IntrStatus); writel(0x1A0F5, ioaddr + IntrEnable); + set_rx_mode(dev); + + enable_irq(dev->irq); + writel(0, ioaddr + RxStartDemand); } @@ -887,31 +953,36 @@ printk(KERN_DEBUG "Tx Descriptor addr %xh.\n",readl(ioaddr+0x4C)); #endif - spin_lock_irq(&np->lock); /* * Under high load dirty_tx and the internal tx descriptor pointer * come out of sync, thus perform a software reset and reinitialize * everything. */ + disable_irq(dev->irq); + del_timer_sync(&np->timer); + spin_lock(&np->lock); writel(1, dev->base_addr+PCIBusCfg); + readl(dev->base_addr+PCIBusCfg); udelay(1); free_rxtx_rings(np); init_rxtx_rings(dev); init_registers(dev); - set_rx_mode(dev); - spin_unlock_irq(&np->lock); + spin_unlock(&np->lock); + enable_irq(dev->irq); netif_wake_queue(dev); dev->trans_start = jiffies; np->stats.tx_errors++; - return; + + np->timer.expires = jiffies + 1*HZ; + add_timer(&np->timer); } /* Initialize the Rx and Tx rings, along with various 'dev' bits. */ -static int alloc_ring(struct net_device *dev) +static int alloc_ringdesc(struct net_device *dev) { struct netdev_private *np = dev->priv; @@ -927,6 +998,14 @@ return 0; } +static void free_ringdesc(struct netdev_private *np) +{ + pci_free_consistent(np->pci_dev, + sizeof(struct w840_rx_desc)*RX_RING_SIZE + + sizeof(struct w840_tx_desc)*TX_RING_SIZE, + np->rx_ring, np->ring_dma_addr); + +} static int start_tx(struct sk_buff *skb, struct net_device *dev) { @@ -958,9 +1037,9 @@ /* The spinlock protects against 2 races: * - tx_q_bytes is updated by this function and intr_handler - * - our hardware is extremely fast and finishes the packet between - * our check for "queue full" and netif_stop_queue. - * Thus setting DescOwn and netif_stop_queue must be atomic. + * - netdev_tx_done() could run immediately after setting DescOwn. + * If setting DescOwn and netif_stop_queue() is not atomic, we can + * lock up. */ spin_lock_irq(&np->lock); @@ -990,6 +1069,61 @@ return 0; } +static void netdev_tx_done(struct net_device *dev) +{ + struct netdev_private *np = dev->priv; + for (; np->cur_tx - np->dirty_tx > 0; np->dirty_tx++) { + int entry = np->dirty_tx % TX_RING_SIZE; + int tx_status = le32_to_cpu(np->tx_ring[entry].status); + + if (tx_status < 0) + break; + if (tx_status & 0x8000) { /* There was an error, log it. */ +#ifndef final_version + if (debug > 1) + printk(KERN_DEBUG "%s: Transmit error, Tx status %8.8x.\n", + dev->name, tx_status); +#endif + np->stats.tx_errors++; + if (tx_status & 0x0104) np->stats.tx_aborted_errors++; + if (tx_status & 0x0C80) np->stats.tx_carrier_errors++; + if (tx_status & 0x0200) np->stats.tx_window_errors++; + if (tx_status & 0x0002) np->stats.tx_fifo_errors++; + if ((tx_status & 0x0080) && np->full_duplex == 0) + np->stats.tx_heartbeat_errors++; +#ifdef ETHER_STATS + if (tx_status & 0x0100) np->stats.collisions16++; +#endif + } else { +#ifdef ETHER_STATS + if (tx_status & 0x0001) np->stats.tx_deferred++; +#endif +#ifndef final_version + if (debug > 3) + printk(KERN_DEBUG "%s: Transmit slot %d ok, Tx status %8.8x.\n", + dev->name, entry, tx_status); +#endif + np->stats.tx_bytes += np->tx_skbuff[entry]->len; + np->stats.collisions += (tx_status >> 3) & 15; + np->stats.tx_packets++; + } + /* Free the original skb. */ + pci_unmap_single(np->pci_dev,np->tx_addr[entry], + np->tx_skbuff[entry]->len, + PCI_DMA_TODEVICE); + np->tx_q_bytes -= np->tx_skbuff[entry]->len; + dev_kfree_skb_irq(np->tx_skbuff[entry]); + np->tx_skbuff[entry] = 0; + } + if (np->tx_full && + np->cur_tx - np->dirty_tx < TX_QUEUE_LEN - 4 + && np->tx_q_bytes < TX_BUG_FIFO_LIMIT) { + /* The ring is no longer full, clear tbusy. */ + np->tx_full = 0; + netif_wake_queue(dev); + } +} + /* The interrupt handler does all of the Rx thread work and cleans up after the Tx thread. */ static void intr_handler(int irq, void *dev_instance, struct pt_regs *rgs) @@ -999,8 +1133,8 @@ long ioaddr = dev->base_addr; int work_limit = max_interrupt_work; - spin_lock(&np->lock); - + if (np->dev_suspended) + return; do { u32 intr_status = readl(ioaddr + IntrStatus); @@ -1016,51 +1150,14 @@ if (intr_status & (IntrRxDone | RxNoBuf)) netdev_rx(dev); + if (intr_status & RxNoBuf) + writel(0, ioaddr + RxStartDemand); - for (; np->cur_tx - np->dirty_tx > 0; np->dirty_tx++) { - int entry = np->dirty_tx % TX_RING_SIZE; - int tx_status = le32_to_cpu(np->tx_ring[entry].status); - - if (tx_status < 0) - break; - if (tx_status & 0x8000) { /* There was an error, log it. */ -#ifndef final_version - if (debug > 1) - printk(KERN_DEBUG "%s: Transmit error, Tx status %8.8x.\n", - dev->name, tx_status); -#endif - np->stats.tx_errors++; - if (tx_status & 0x0104) np->stats.tx_aborted_errors++; - if (tx_status & 0x0C80) np->stats.tx_carrier_errors++; - if (tx_status & 0x0200) np->stats.tx_window_errors++; - if (tx_status & 0x0002) np->stats.tx_fifo_errors++; - if ((tx_status & 0x0080) && np->full_duplex == 0) - np->stats.tx_heartbeat_errors++; -#ifdef ETHER_STATS - if (tx_status & 0x0100) np->stats.collisions16++; -#endif - } else { -#ifdef ETHER_STATS - if (tx_status & 0x0001) np->stats.tx_deferred++; -#endif - np->stats.tx_bytes += np->tx_skbuff[entry]->len; - np->stats.collisions += (tx_status >> 3) & 15; - np->stats.tx_packets++; - } - /* Free the original skb. */ - pci_unmap_single(np->pci_dev,np->tx_addr[entry], - np->tx_skbuff[entry]->len, - PCI_DMA_TODEVICE); - np->tx_q_bytes -= np->tx_skbuff[entry]->len; - dev_kfree_skb_irq(np->tx_skbuff[entry]); - np->tx_skbuff[entry] = 0; - } - if (np->tx_full && - np->cur_tx - np->dirty_tx < TX_QUEUE_LEN - 4 - && np->tx_q_bytes < TX_BUG_FIFO_LIMIT) { - /* The ring is no longer full, clear tbusy. */ - np->tx_full = 0; - netif_wake_queue(dev); + if (intr_status & (TxIdle | IntrTxDone) && + np->cur_tx != np->dirty_tx) { + spin_lock(&np->lock); + netdev_tx_done(dev); + spin_unlock(&np->lock); } /* Abnormal error summary/uncommon events handlers. */ @@ -1073,8 +1170,12 @@ "status=0x%4.4x.\n", dev->name, intr_status); /* Set the timer to re-enable the other interrupts after 10*82usec ticks. */ - writel(AbnormalIntr | TimerInt, ioaddr + IntrEnable); - writel(10, ioaddr + GPTimer); + spin_lock(&np->lock); + if (!np->dev_suspended) { + writel(AbnormalIntr | TimerInt, ioaddr + IntrEnable); + writel(10, ioaddr + GPTimer); + } + spin_unlock(&np->lock); break; } } while (1); @@ -1082,8 +1183,6 @@ if (debug > 3) printk(KERN_DEBUG "%s: exiting interrupt, status=%#4.4x.\n", dev->name, (int)readl(ioaddr + IntrStatus)); - - spin_unlock(&np->lock); } /* This routine is logically part of the interrupt handler, but separated @@ -1218,31 +1317,36 @@ if (intr_status == 0xffffffff) return; if (intr_status & TxFIFOUnderflow) { + int new; /* Bump up the Tx threshold */ + spin_lock(&np->lock); #if 0 /* This causes lots of dropped packets, * and under high load even tx_timeouts */ - np->csr6 += 0x4000; + new = np->csr6 + 0x4000; #else - int cur = (np->csr6 >> 14)&0x7f; - if (cur < 64) - cur *= 2; + new = (np->csr6 >> 14)&0x7f; + if (new < 64) + new *= 2; else - cur = 0; /* load full packet before starting */ - np->csr6 &= ~(0x7F << 14); - np->csr6 |= cur<<14; + new = 0; /* load full packet before starting */ + new = (np->csr6 & ~(0x7F << 14)) | (new<<14); #endif - printk(KERN_DEBUG "%s: Tx underflow, increasing threshold to %8.8x.\n", - dev->name, np->csr6); - writel(np->csr6, ioaddr + NetworkConfig); + printk(KERN_DEBUG "%s: Tx underflow, new csr6 %8.8x.\n", + dev->name, new); + update_csr6(dev, new); + spin_unlock(&np->lock); } if (intr_status & IntrRxDied) { /* Missed a Rx frame. */ np->stats.rx_errors++; } if (intr_status & TimerInt) { /* Re-enable other interrupts. */ - writel(0x1A0F5, ioaddr + IntrEnable); + spin_lock(&np->lock); + if (!np->dev_suspended) + writel(0x1A0F5, ioaddr + IntrEnable); + spin_unlock(&np->lock); } np->stats.rx_missed_errors += readl(ioaddr + RxMissed) & 0xffff; writel(0, ioaddr + RxStartDemand); @@ -1307,26 +1411,33 @@ } writel(mc_filter[0], ioaddr + MulticastFilter0); writel(mc_filter[1], ioaddr + MulticastFilter1); - np->csr6 &= ~0x00F8; - np->csr6 |= rx_mode; - writel(np->csr6, ioaddr + NetworkConfig); + spin_lock_irq(&np->lock); + update_csr6(dev, (np->csr6 & ~0x00F8) | rx_mode); + spin_unlock_irq(&np->lock); } static int mii_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) { + struct netdev_private *np = dev->priv; u16 *data = (u16 *)&rq->ifr_data; switch(cmd) { case SIOCDEVPRIVATE: /* Get the address of the PHY in use. */ + spin_lock_irq(&np->lock); data[0] = ((struct netdev_private *)dev->priv)->phys[0] & 0x1f; + spin_unlock_irq(&np->lock); /* Fall Through */ case SIOCDEVPRIVATE+1: /* Read the specified MII register. */ + spin_lock_irq(&np->lock); data[3] = mdio_read(dev, data[0] & 0x1f, data[1] & 0x1f); + spin_unlock_irq(&np->lock); return 0; case SIOCDEVPRIVATE+2: /* Write the specified MII register */ if (!capable(CAP_NET_ADMIN)) return -EPERM; + spin_lock_irq(&np->lock); mdio_write(dev, data[0] & 0x1f, data[1] & 0x1f, data[2]); + spin_unlock_irq(&np->lock); return 0; default: return -EOPNOTSUPP; @@ -1348,12 +1459,18 @@ printk(KERN_DEBUG "%s: Queue pointers were Tx %d / %d, Rx %d / %d.\n", dev->name, np->cur_tx, np->dirty_tx, np->cur_rx, np->dirty_rx); } + /* Prevent further calls to the irq handler first. + * Otherwise it could reenable interrupts .. + */ + free_irq(dev->irq, dev); /* Disable interrupts by clearing the interrupt mask. */ writel(0x0000, ioaddr + IntrEnable); /* Stop the chip's Tx and Rx processes. */ - writel(np->csr6 &= ~0x20FA, ioaddr + NetworkConfig); + spin_lock_irq(&np->lock); + update_csr6(dev, np->csr6 & ~0x20FA); + spin_unlock_irq(&np->lock); if (readl(ioaddr + NetworkConfig) != 0xffffffff) np->stats.rx_missed_errors += readl(ioaddr + RxMissed) & 0xffff; @@ -1376,11 +1493,10 @@ } #endif /* __i386__ debugging only */ - free_irq(dev->irq, dev); - del_timer_sync(&np->timer); free_rxtx_rings(np); + free_ringdesc(np); return 0; } @@ -1402,11 +1518,72 @@ pci_set_drvdata(pdev, NULL); } +static void w840_suspend (struct pci_dev *pdev) +{ + struct net_device *dev = pci_get_drvdata (pdev); + struct netdev_private *np = dev->priv; + long ioaddr = dev->base_addr; + + netif_device_detach(dev); + /* no more calls to tx_timeout, hard_start_xmit, set_rx_mode */ + rtnl_lock(); + rtnl_unlock(); + /* noone within ->open */ + if (netif_running (dev)) { + del_timer_sync(&np->timer); + /* no more link beat timer calls */ + spin_lock_irq(&np->lock); + update_csr6(dev, np->csr6 & ~0x2002); + /* Tx and Rx processes stopped */ + + np->dev_suspended = 1; + writel(0, ioaddr + IntrEnable); + /* all irq events disabled. */ + spin_unlock_irq(&np->lock); + + synchronize_irq(); + + /* Update the error counts. */ + np->stats.rx_missed_errors += readl(ioaddr + RxMissed) & 0xffff; + + /* pci_power_off(pdev, -1); */ + /* if (np->drv_flags & HasACPI) {...} */ + + free_rxtx_rings(np); + } +} + + +static void w840_resume (struct pci_dev *pdev) +{ + struct net_device *dev = pci_get_drvdata (pdev); + struct netdev_private *np = dev->priv; + + if (netif_running (dev)) { + pci_enable_device(pdev); + /* pci_power_on(pdev); */ + /* if (np->drv_flags & HasACPI) {...} */ + np->dev_suspended = 0; + + writel(1, dev->base_addr+PCIBusCfg); + readl(dev->base_addr+PCIBusCfg); + udelay(1); + init_rxtx_rings(dev); + init_registers(dev); + + np->timer.expires = jiffies + 1*HZ; + add_timer(&np->timer); + } + netif_device_attach(dev); +} + static struct pci_driver w840_driver = { name: "winbond-840", id_table: w840_pci_tbl, probe: w840_probe1, remove: w840_remove1, + suspend: w840_suspend, + resume: w840_resume, }; static int __init w840_init(void)
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This archive was generated by hypermail 2b29 : Wed May 23 2001 - 21:00:32 EST