diff options
Diffstat (limited to 'drivers/net/ethernet/apple/mace.c')
| -rw-r--r-- | drivers/net/ethernet/apple/mace.c | 1031 |
1 files changed, 1031 insertions, 0 deletions
diff --git a/drivers/net/ethernet/apple/mace.c b/drivers/net/ethernet/apple/mace.c new file mode 100644 index 000000000..fd1b008b7 --- /dev/null +++ b/drivers/net/ethernet/apple/mace.c @@ -0,0 +1,1031 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Network device driver for the MACE ethernet controller on + * Apple Powermacs. Assumes it's under a DBDMA controller. + * + * Copyright (C) 1996 Paul Mackerras. + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/delay.h> +#include <linux/string.h> +#include <linux/timer.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/crc32.h> +#include <linux/spinlock.h> +#include <linux/bitrev.h> +#include <linux/slab.h> +#include <linux/pgtable.h> +#include <asm/dbdma.h> +#include <asm/io.h> +#include <asm/macio.h> + +#include "mace.h" + +static int port_aaui = -1; + +#define N_RX_RING 8 +#define N_TX_RING 6 +#define MAX_TX_ACTIVE 1 +#define NCMDS_TX 1 /* dma commands per element in tx ring */ +#define RX_BUFLEN (ETH_FRAME_LEN + 8) +#define TX_TIMEOUT HZ /* 1 second */ + +/* Chip rev needs workaround on HW & multicast addr change */ +#define BROKEN_ADDRCHG_REV 0x0941 + +/* Bits in transmit DMA status */ +#define TX_DMA_ERR 0x80 + +struct mace_data { + volatile struct mace __iomem *mace; + volatile struct dbdma_regs __iomem *tx_dma; + int tx_dma_intr; + volatile struct dbdma_regs __iomem *rx_dma; + int rx_dma_intr; + volatile struct dbdma_cmd *tx_cmds; /* xmit dma command list */ + volatile struct dbdma_cmd *rx_cmds; /* recv dma command list */ + struct sk_buff *rx_bufs[N_RX_RING]; + int rx_fill; + int rx_empty; + struct sk_buff *tx_bufs[N_TX_RING]; + int tx_fill; + int tx_empty; + unsigned char maccc; + unsigned char tx_fullup; + unsigned char tx_active; + unsigned char tx_bad_runt; + struct timer_list tx_timeout; + int timeout_active; + int port_aaui; + int chipid; + struct macio_dev *mdev; + spinlock_t lock; +}; + +/* + * Number of bytes of private data per MACE: allow enough for + * the rx and tx dma commands plus a branch dma command each, + * and another 16 bytes to allow us to align the dma command + * buffers on a 16 byte boundary. + */ +#define PRIV_BYTES (sizeof(struct mace_data) \ + + (N_RX_RING + NCMDS_TX * N_TX_RING + 3) * sizeof(struct dbdma_cmd)) + +static int mace_open(struct net_device *dev); +static int mace_close(struct net_device *dev); +static netdev_tx_t mace_xmit_start(struct sk_buff *skb, struct net_device *dev); +static void mace_set_multicast(struct net_device *dev); +static void mace_reset(struct net_device *dev); +static int mace_set_address(struct net_device *dev, void *addr); +static irqreturn_t mace_interrupt(int irq, void *dev_id); +static irqreturn_t mace_txdma_intr(int irq, void *dev_id); +static irqreturn_t mace_rxdma_intr(int irq, void *dev_id); +static void mace_set_timeout(struct net_device *dev); +static void mace_tx_timeout(struct timer_list *t); +static inline void dbdma_reset(volatile struct dbdma_regs __iomem *dma); +static inline void mace_clean_rings(struct mace_data *mp); +static void __mace_set_address(struct net_device *dev, const void *addr); + +/* + * If we can't get a skbuff when we need it, we use this area for DMA. + */ +static unsigned char *dummy_buf; + +static const struct net_device_ops mace_netdev_ops = { + .ndo_open = mace_open, + .ndo_stop = mace_close, + .ndo_start_xmit = mace_xmit_start, + .ndo_set_rx_mode = mace_set_multicast, + .ndo_set_mac_address = mace_set_address, + .ndo_validate_addr = eth_validate_addr, +}; + +static int mace_probe(struct macio_dev *mdev, const struct of_device_id *match) +{ + struct device_node *mace = macio_get_of_node(mdev); + struct net_device *dev; + struct mace_data *mp; + const unsigned char *addr; + u8 macaddr[ETH_ALEN]; + int j, rev, rc = -EBUSY; + + if (macio_resource_count(mdev) != 3 || macio_irq_count(mdev) != 3) { + printk(KERN_ERR "can't use MACE %pOF: need 3 addrs and 3 irqs\n", + mace); + return -ENODEV; + } + + addr = of_get_property(mace, "mac-address", NULL); + if (addr == NULL) { + addr = of_get_property(mace, "local-mac-address", NULL); + if (addr == NULL) { + printk(KERN_ERR "Can't get mac-address for MACE %pOF\n", + mace); + return -ENODEV; + } + } + + /* + * lazy allocate the driver-wide dummy buffer. (Note that we + * never have more than one MACE in the system anyway) + */ + if (dummy_buf == NULL) { + dummy_buf = kmalloc(RX_BUFLEN+2, GFP_KERNEL); + if (dummy_buf == NULL) + return -ENOMEM; + } + + if (macio_request_resources(mdev, "mace")) { + printk(KERN_ERR "MACE: can't request IO resources !\n"); + return -EBUSY; + } + + dev = alloc_etherdev(PRIV_BYTES); + if (!dev) { + rc = -ENOMEM; + goto err_release; + } + SET_NETDEV_DEV(dev, &mdev->ofdev.dev); + + mp = netdev_priv(dev); + mp->mdev = mdev; + macio_set_drvdata(mdev, dev); + + dev->base_addr = macio_resource_start(mdev, 0); + mp->mace = ioremap(dev->base_addr, 0x1000); + if (mp->mace == NULL) { + printk(KERN_ERR "MACE: can't map IO resources !\n"); + rc = -ENOMEM; + goto err_free; + } + dev->irq = macio_irq(mdev, 0); + + rev = addr[0] == 0 && addr[1] == 0xA0; + for (j = 0; j < 6; ++j) { + macaddr[j] = rev ? bitrev8(addr[j]): addr[j]; + } + eth_hw_addr_set(dev, macaddr); + mp->chipid = (in_8(&mp->mace->chipid_hi) << 8) | + in_8(&mp->mace->chipid_lo); + + + mp = netdev_priv(dev); + mp->maccc = ENXMT | ENRCV; + + mp->tx_dma = ioremap(macio_resource_start(mdev, 1), 0x1000); + if (mp->tx_dma == NULL) { + printk(KERN_ERR "MACE: can't map TX DMA resources !\n"); + rc = -ENOMEM; + goto err_unmap_io; + } + mp->tx_dma_intr = macio_irq(mdev, 1); + + mp->rx_dma = ioremap(macio_resource_start(mdev, 2), 0x1000); + if (mp->rx_dma == NULL) { + printk(KERN_ERR "MACE: can't map RX DMA resources !\n"); + rc = -ENOMEM; + goto err_unmap_tx_dma; + } + mp->rx_dma_intr = macio_irq(mdev, 2); + + mp->tx_cmds = (volatile struct dbdma_cmd *) DBDMA_ALIGN(mp + 1); + mp->rx_cmds = mp->tx_cmds + NCMDS_TX * N_TX_RING + 1; + + memset((char *) mp->tx_cmds, 0, + (NCMDS_TX*N_TX_RING + N_RX_RING + 2) * sizeof(struct dbdma_cmd)); + timer_setup(&mp->tx_timeout, mace_tx_timeout, 0); + spin_lock_init(&mp->lock); + mp->timeout_active = 0; + + if (port_aaui >= 0) + mp->port_aaui = port_aaui; + else { + /* Apple Network Server uses the AAUI port */ + if (of_machine_is_compatible("AAPL,ShinerESB")) + mp->port_aaui = 1; + else { +#ifdef CONFIG_MACE_AAUI_PORT + mp->port_aaui = 1; +#else + mp->port_aaui = 0; +#endif + } + } + + dev->netdev_ops = &mace_netdev_ops; + + /* + * Most of what is below could be moved to mace_open() + */ + mace_reset(dev); + + rc = request_irq(dev->irq, mace_interrupt, 0, "MACE", dev); + if (rc) { + printk(KERN_ERR "MACE: can't get irq %d\n", dev->irq); + goto err_unmap_rx_dma; + } + rc = request_irq(mp->tx_dma_intr, mace_txdma_intr, 0, "MACE-txdma", dev); + if (rc) { + printk(KERN_ERR "MACE: can't get irq %d\n", mp->tx_dma_intr); + goto err_free_irq; + } + rc = request_irq(mp->rx_dma_intr, mace_rxdma_intr, 0, "MACE-rxdma", dev); + if (rc) { + printk(KERN_ERR "MACE: can't get irq %d\n", mp->rx_dma_intr); + goto err_free_tx_irq; + } + + rc = register_netdev(dev); + if (rc) { + printk(KERN_ERR "MACE: Cannot register net device, aborting.\n"); + goto err_free_rx_irq; + } + + printk(KERN_INFO "%s: MACE at %pM, chip revision %d.%d\n", + dev->name, dev->dev_addr, + mp->chipid >> 8, mp->chipid & 0xff); + + return 0; + + err_free_rx_irq: + free_irq(macio_irq(mdev, 2), dev); + err_free_tx_irq: + free_irq(macio_irq(mdev, 1), dev); + err_free_irq: + free_irq(macio_irq(mdev, 0), dev); + err_unmap_rx_dma: + iounmap(mp->rx_dma); + err_unmap_tx_dma: + iounmap(mp->tx_dma); + err_unmap_io: + iounmap(mp->mace); + err_free: + free_netdev(dev); + err_release: + macio_release_resources(mdev); + + return rc; +} + +static int mace_remove(struct macio_dev *mdev) +{ + struct net_device *dev = macio_get_drvdata(mdev); + struct mace_data *mp; + + BUG_ON(dev == NULL); + + macio_set_drvdata(mdev, NULL); + + mp = netdev_priv(dev); + + unregister_netdev(dev); + + free_irq(dev->irq, dev); + free_irq(mp->tx_dma_intr, dev); + free_irq(mp->rx_dma_intr, dev); + + iounmap(mp->rx_dma); + iounmap(mp->tx_dma); + iounmap(mp->mace); + + free_netdev(dev); + + macio_release_resources(mdev); + + return 0; +} + +static void dbdma_reset(volatile struct dbdma_regs __iomem *dma) +{ + int i; + + out_le32(&dma->control, (WAKE|FLUSH|PAUSE|RUN) << 16); + + /* + * Yes this looks peculiar, but apparently it needs to be this + * way on some machines. + */ + for (i = 200; i > 0; --i) + if (le32_to_cpu(dma->control) & RUN) + udelay(1); +} + +static void mace_reset(struct net_device *dev) +{ + struct mace_data *mp = netdev_priv(dev); + volatile struct mace __iomem *mb = mp->mace; + int i; + + /* soft-reset the chip */ + i = 200; + while (--i) { + out_8(&mb->biucc, SWRST); + if (in_8(&mb->biucc) & SWRST) { + udelay(10); + continue; + } + break; + } + if (!i) { + printk(KERN_ERR "mace: cannot reset chip!\n"); + return; + } + + out_8(&mb->imr, 0xff); /* disable all intrs for now */ + i = in_8(&mb->ir); + out_8(&mb->maccc, 0); /* turn off tx, rx */ + + out_8(&mb->biucc, XMTSP_64); + out_8(&mb->utr, RTRD); + out_8(&mb->fifocc, RCVFW_32 | XMTFW_16 | XMTFWU | RCVFWU | XMTBRST); + out_8(&mb->xmtfc, AUTO_PAD_XMIT); /* auto-pad short frames */ + out_8(&mb->rcvfc, 0); + + /* load up the hardware address */ + __mace_set_address(dev, dev->dev_addr); + + /* clear the multicast filter */ + if (mp->chipid == BROKEN_ADDRCHG_REV) + out_8(&mb->iac, LOGADDR); + else { + out_8(&mb->iac, ADDRCHG | LOGADDR); + while ((in_8(&mb->iac) & ADDRCHG) != 0) + ; + } + for (i = 0; i < 8; ++i) + out_8(&mb->ladrf, 0); + + /* done changing address */ + if (mp->chipid != BROKEN_ADDRCHG_REV) + out_8(&mb->iac, 0); + + if (mp->port_aaui) + out_8(&mb->plscc, PORTSEL_AUI + ENPLSIO); + else + out_8(&mb->plscc, PORTSEL_GPSI + ENPLSIO); +} + +static void __mace_set_address(struct net_device *dev, const void *addr) +{ + struct mace_data *mp = netdev_priv(dev); + volatile struct mace __iomem *mb = mp->mace; + const unsigned char *p = addr; + u8 macaddr[ETH_ALEN]; + int i; + + /* load up the hardware address */ + if (mp->chipid == BROKEN_ADDRCHG_REV) + out_8(&mb->iac, PHYADDR); + else { + out_8(&mb->iac, ADDRCHG | PHYADDR); + while ((in_8(&mb->iac) & ADDRCHG) != 0) + ; + } + for (i = 0; i < 6; ++i) + out_8(&mb->padr, macaddr[i] = p[i]); + + eth_hw_addr_set(dev, macaddr); + + if (mp->chipid != BROKEN_ADDRCHG_REV) + out_8(&mb->iac, 0); +} + +static int mace_set_address(struct net_device *dev, void *addr) +{ + struct mace_data *mp = netdev_priv(dev); + volatile struct mace __iomem *mb = mp->mace; + unsigned long flags; + + spin_lock_irqsave(&mp->lock, flags); + + __mace_set_address(dev, addr); + + /* note: setting ADDRCHG clears ENRCV */ + out_8(&mb->maccc, mp->maccc); + + spin_unlock_irqrestore(&mp->lock, flags); + return 0; +} + +static inline void mace_clean_rings(struct mace_data *mp) +{ + int i; + + /* free some skb's */ + for (i = 0; i < N_RX_RING; ++i) { + if (mp->rx_bufs[i] != NULL) { + dev_kfree_skb(mp->rx_bufs[i]); + mp->rx_bufs[i] = NULL; + } + } + for (i = mp->tx_empty; i != mp->tx_fill; ) { + dev_kfree_skb(mp->tx_bufs[i]); + if (++i >= N_TX_RING) + i = 0; + } +} + +static int mace_open(struct net_device *dev) +{ + struct mace_data *mp = netdev_priv(dev); + volatile struct mace __iomem *mb = mp->mace; + volatile struct dbdma_regs __iomem *rd = mp->rx_dma; + volatile struct dbdma_regs __iomem *td = mp->tx_dma; + volatile struct dbdma_cmd *cp; + int i; + struct sk_buff *skb; + unsigned char *data; + + /* reset the chip */ + mace_reset(dev); + + /* initialize list of sk_buffs for receiving and set up recv dma */ + mace_clean_rings(mp); + memset((char *)mp->rx_cmds, 0, N_RX_RING * sizeof(struct dbdma_cmd)); + cp = mp->rx_cmds; + for (i = 0; i < N_RX_RING - 1; ++i) { + skb = netdev_alloc_skb(dev, RX_BUFLEN + 2); + if (!skb) { + data = dummy_buf; + } else { + skb_reserve(skb, 2); /* so IP header lands on 4-byte bdry */ + data = skb->data; + } + mp->rx_bufs[i] = skb; + cp->req_count = cpu_to_le16(RX_BUFLEN); + cp->command = cpu_to_le16(INPUT_LAST + INTR_ALWAYS); + cp->phy_addr = cpu_to_le32(virt_to_bus(data)); + cp->xfer_status = 0; + ++cp; + } + mp->rx_bufs[i] = NULL; + cp->command = cpu_to_le16(DBDMA_STOP); + mp->rx_fill = i; + mp->rx_empty = 0; + + /* Put a branch back to the beginning of the receive command list */ + ++cp; + cp->command = cpu_to_le16(DBDMA_NOP + BR_ALWAYS); + cp->cmd_dep = cpu_to_le32(virt_to_bus(mp->rx_cmds)); + + /* start rx dma */ + out_le32(&rd->control, (RUN|PAUSE|FLUSH|WAKE) << 16); /* clear run bit */ + out_le32(&rd->cmdptr, virt_to_bus(mp->rx_cmds)); + out_le32(&rd->control, (RUN << 16) | RUN); + + /* put a branch at the end of the tx command list */ + cp = mp->tx_cmds + NCMDS_TX * N_TX_RING; + cp->command = cpu_to_le16(DBDMA_NOP + BR_ALWAYS); + cp->cmd_dep = cpu_to_le32(virt_to_bus(mp->tx_cmds)); + + /* reset tx dma */ + out_le32(&td->control, (RUN|PAUSE|FLUSH|WAKE) << 16); + out_le32(&td->cmdptr, virt_to_bus(mp->tx_cmds)); + mp->tx_fill = 0; + mp->tx_empty = 0; + mp->tx_fullup = 0; + mp->tx_active = 0; + mp->tx_bad_runt = 0; + + /* turn it on! */ + out_8(&mb->maccc, mp->maccc); + /* enable all interrupts except receive interrupts */ + out_8(&mb->imr, RCVINT); + + return 0; +} + +static int mace_close(struct net_device *dev) +{ + struct mace_data *mp = netdev_priv(dev); + volatile struct mace __iomem *mb = mp->mace; + volatile struct dbdma_regs __iomem *rd = mp->rx_dma; + volatile struct dbdma_regs __iomem *td = mp->tx_dma; + + /* disable rx and tx */ + out_8(&mb->maccc, 0); + out_8(&mb->imr, 0xff); /* disable all intrs */ + + /* disable rx and tx dma */ + rd->control = cpu_to_le32((RUN|PAUSE|FLUSH|WAKE) << 16); /* clear run bit */ + td->control = cpu_to_le32((RUN|PAUSE|FLUSH|WAKE) << 16); /* clear run bit */ + + mace_clean_rings(mp); + + return 0; +} + +static inline void mace_set_timeout(struct net_device *dev) +{ + struct mace_data *mp = netdev_priv(dev); + + if (mp->timeout_active) + del_timer(&mp->tx_timeout); + mp->tx_timeout.expires = jiffies + TX_TIMEOUT; + add_timer(&mp->tx_timeout); + mp->timeout_active = 1; +} + +static netdev_tx_t mace_xmit_start(struct sk_buff *skb, struct net_device *dev) +{ + struct mace_data *mp = netdev_priv(dev); + volatile struct dbdma_regs __iomem *td = mp->tx_dma; + volatile struct dbdma_cmd *cp, *np; + unsigned long flags; + int fill, next, len; + + /* see if there's a free slot in the tx ring */ + spin_lock_irqsave(&mp->lock, flags); + fill = mp->tx_fill; + next = fill + 1; + if (next >= N_TX_RING) + next = 0; + if (next == mp->tx_empty) { + netif_stop_queue(dev); + mp->tx_fullup = 1; + spin_unlock_irqrestore(&mp->lock, flags); + return NETDEV_TX_BUSY; /* can't take it at the moment */ + } + spin_unlock_irqrestore(&mp->lock, flags); + + /* partially fill in the dma command block */ + len = skb->len; + if (len > ETH_FRAME_LEN) { + printk(KERN_DEBUG "mace: xmit frame too long (%d)\n", len); + len = ETH_FRAME_LEN; + } + mp->tx_bufs[fill] = skb; + cp = mp->tx_cmds + NCMDS_TX * fill; + cp->req_count = cpu_to_le16(len); + cp->phy_addr = cpu_to_le32(virt_to_bus(skb->data)); + + np = mp->tx_cmds + NCMDS_TX * next; + out_le16(&np->command, DBDMA_STOP); + + /* poke the tx dma channel */ + spin_lock_irqsave(&mp->lock, flags); + mp->tx_fill = next; + if (!mp->tx_bad_runt && mp->tx_active < MAX_TX_ACTIVE) { + out_le16(&cp->xfer_status, 0); + out_le16(&cp->command, OUTPUT_LAST); + out_le32(&td->control, ((RUN|WAKE) << 16) + (RUN|WAKE)); + ++mp->tx_active; + mace_set_timeout(dev); + } + if (++next >= N_TX_RING) + next = 0; + if (next == mp->tx_empty) + netif_stop_queue(dev); + spin_unlock_irqrestore(&mp->lock, flags); + + return NETDEV_TX_OK; +} + +static void mace_set_multicast(struct net_device *dev) +{ + struct mace_data *mp = netdev_priv(dev); + volatile struct mace __iomem *mb = mp->mace; + int i; + u32 crc; + unsigned long flags; + + spin_lock_irqsave(&mp->lock, flags); + mp->maccc &= ~PROM; + if (dev->flags & IFF_PROMISC) { + mp->maccc |= PROM; + } else { + unsigned char multicast_filter[8]; + struct netdev_hw_addr *ha; + + if (dev->flags & IFF_ALLMULTI) { + for (i = 0; i < 8; i++) + multicast_filter[i] = 0xff; + } else { + for (i = 0; i < 8; i++) + multicast_filter[i] = 0; + netdev_for_each_mc_addr(ha, dev) { + crc = ether_crc_le(6, ha->addr); + i = crc >> 26; /* bit number in multicast_filter */ + multicast_filter[i >> 3] |= 1 << (i & 7); + } + } +#if 0 + printk("Multicast filter :"); + for (i = 0; i < 8; i++) + printk("%02x ", multicast_filter[i]); + printk("\n"); +#endif + + if (mp->chipid == BROKEN_ADDRCHG_REV) + out_8(&mb->iac, LOGADDR); + else { + out_8(&mb->iac, ADDRCHG | LOGADDR); + while ((in_8(&mb->iac) & ADDRCHG) != 0) + ; + } + for (i = 0; i < 8; ++i) + out_8(&mb->ladrf, multicast_filter[i]); + if (mp->chipid != BROKEN_ADDRCHG_REV) + out_8(&mb->iac, 0); + } + /* reset maccc */ + out_8(&mb->maccc, mp->maccc); + spin_unlock_irqrestore(&mp->lock, flags); +} + +static void mace_handle_misc_intrs(struct mace_data *mp, int intr, struct net_device *dev) +{ + volatile struct mace __iomem *mb = mp->mace; + static int mace_babbles, mace_jabbers; + + if (intr & MPCO) + dev->stats.rx_missed_errors += 256; + dev->stats.rx_missed_errors += in_8(&mb->mpc); /* reading clears it */ + if (intr & RNTPCO) + dev->stats.rx_length_errors += 256; + dev->stats.rx_length_errors += in_8(&mb->rntpc); /* reading clears it */ + if (intr & CERR) + ++dev->stats.tx_heartbeat_errors; + if (intr & BABBLE) + if (mace_babbles++ < 4) + printk(KERN_DEBUG "mace: babbling transmitter\n"); + if (intr & JABBER) + if (mace_jabbers++ < 4) + printk(KERN_DEBUG "mace: jabbering transceiver\n"); +} + +static irqreturn_t mace_interrupt(int irq, void *dev_id) +{ + struct net_device *dev = (struct net_device *) dev_id; + struct mace_data *mp = netdev_priv(dev); + volatile struct mace __iomem *mb = mp->mace; + volatile struct dbdma_regs __iomem *td = mp->tx_dma; + volatile struct dbdma_cmd *cp; + int intr, fs, i, stat, x; + int xcount, dstat; + unsigned long flags; + /* static int mace_last_fs, mace_last_xcount; */ + + spin_lock_irqsave(&mp->lock, flags); + intr = in_8(&mb->ir); /* read interrupt register */ + in_8(&mb->xmtrc); /* get retries */ + mace_handle_misc_intrs(mp, intr, dev); + + i = mp->tx_empty; + while (in_8(&mb->pr) & XMTSV) { + del_timer(&mp->tx_timeout); + mp->timeout_active = 0; + /* + * Clear any interrupt indication associated with this status + * word. This appears to unlatch any error indication from + * the DMA controller. + */ + intr = in_8(&mb->ir); + if (intr != 0) + mace_handle_misc_intrs(mp, intr, dev); + if (mp->tx_bad_runt) { + fs = in_8(&mb->xmtfs); + mp->tx_bad_runt = 0; + out_8(&mb->xmtfc, AUTO_PAD_XMIT); + continue; + } + dstat = le32_to_cpu(td->status); + /* stop DMA controller */ + out_le32(&td->control, RUN << 16); + /* + * xcount is the number of complete frames which have been + * written to the fifo but for which status has not been read. + */ + xcount = (in_8(&mb->fifofc) >> XMTFC_SH) & XMTFC_MASK; + if (xcount == 0 || (dstat & DEAD)) { + /* + * If a packet was aborted before the DMA controller has + * finished transferring it, it seems that there are 2 bytes + * which are stuck in some buffer somewhere. These will get + * transmitted as soon as we read the frame status (which + * reenables the transmit data transfer request). Turning + * off the DMA controller and/or resetting the MACE doesn't + * help. So we disable auto-padding and FCS transmission + * so the two bytes will only be a runt packet which should + * be ignored by other stations. + */ + out_8(&mb->xmtfc, DXMTFCS); + } + fs = in_8(&mb->xmtfs); + if ((fs & XMTSV) == 0) { + printk(KERN_ERR "mace: xmtfs not valid! (fs=%x xc=%d ds=%x)\n", + fs, xcount, dstat); + mace_reset(dev); + /* + * XXX mace likes to hang the machine after a xmtfs error. + * This is hard to reproduce, resetting *may* help + */ + } + cp = mp->tx_cmds + NCMDS_TX * i; + stat = le16_to_cpu(cp->xfer_status); + if ((fs & (UFLO|LCOL|LCAR|RTRY)) || (dstat & DEAD) || xcount == 0) { + /* + * Check whether there were in fact 2 bytes written to + * the transmit FIFO. + */ + udelay(1); + x = (in_8(&mb->fifofc) >> XMTFC_SH) & XMTFC_MASK; + if (x != 0) { + /* there were two bytes with an end-of-packet indication */ + mp->tx_bad_runt = 1; + mace_set_timeout(dev); + } else { + /* + * Either there weren't the two bytes buffered up, or they + * didn't have an end-of-packet indication. + * We flush the transmit FIFO just in case (by setting the + * XMTFWU bit with the transmitter disabled). + */ + out_8(&mb->maccc, in_8(&mb->maccc) & ~ENXMT); + out_8(&mb->fifocc, in_8(&mb->fifocc) | XMTFWU); + udelay(1); + out_8(&mb->maccc, in_8(&mb->maccc) | ENXMT); + out_8(&mb->xmtfc, AUTO_PAD_XMIT); + } + } + /* dma should have finished */ + if (i == mp->tx_fill) { + printk(KERN_DEBUG "mace: tx ring ran out? (fs=%x xc=%d ds=%x)\n", + fs, xcount, dstat); + continue; + } + /* Update stats */ + if (fs & (UFLO|LCOL|LCAR|RTRY)) { + ++dev->stats.tx_errors; + if (fs & LCAR) + ++dev->stats.tx_carrier_errors; + if (fs & (UFLO|LCOL|RTRY)) + ++dev->stats.tx_aborted_errors; + } else { + dev->stats.tx_bytes += mp->tx_bufs[i]->len; + ++dev->stats.tx_packets; + } + dev_consume_skb_irq(mp->tx_bufs[i]); + --mp->tx_active; + if (++i >= N_TX_RING) + i = 0; +#if 0 + mace_last_fs = fs; + mace_last_xcount = xcount; +#endif + } + + if (i != mp->tx_empty) { + mp->tx_fullup = 0; + netif_wake_queue(dev); + } + mp->tx_empty = i; + i += mp->tx_active; + if (i >= N_TX_RING) + i -= N_TX_RING; + if (!mp->tx_bad_runt && i != mp->tx_fill && mp->tx_active < MAX_TX_ACTIVE) { + do { + /* set up the next one */ + cp = mp->tx_cmds + NCMDS_TX * i; + out_le16(&cp->xfer_status, 0); + out_le16(&cp->command, OUTPUT_LAST); + ++mp->tx_active; + if (++i >= N_TX_RING) + i = 0; + } while (i != mp->tx_fill && mp->tx_active < MAX_TX_ACTIVE); + out_le32(&td->control, ((RUN|WAKE) << 16) + (RUN|WAKE)); + mace_set_timeout(dev); + } + spin_unlock_irqrestore(&mp->lock, flags); + return IRQ_HANDLED; +} + +static void mace_tx_timeout(struct timer_list *t) +{ + struct mace_data *mp = from_timer(mp, t, tx_timeout); + struct net_device *dev = macio_get_drvdata(mp->mdev); + volatile struct mace __iomem *mb = mp->mace; + volatile struct dbdma_regs __iomem *td = mp->tx_dma; + volatile struct dbdma_regs __iomem *rd = mp->rx_dma; + volatile struct dbdma_cmd *cp; + unsigned long flags; + int i; + + spin_lock_irqsave(&mp->lock, flags); + mp->timeout_active = 0; + if (mp->tx_active == 0 && !mp->tx_bad_runt) + goto out; + + /* update various counters */ + mace_handle_misc_intrs(mp, in_8(&mb->ir), dev); + + cp = mp->tx_cmds + NCMDS_TX * mp->tx_empty; + + /* turn off both tx and rx and reset the chip */ + out_8(&mb->maccc, 0); + printk(KERN_ERR "mace: transmit timeout - resetting\n"); + dbdma_reset(td); + mace_reset(dev); + + /* restart rx dma */ + cp = bus_to_virt(le32_to_cpu(rd->cmdptr)); + dbdma_reset(rd); + out_le16(&cp->xfer_status, 0); + out_le32(&rd->cmdptr, virt_to_bus(cp)); + out_le32(&rd->control, (RUN << 16) | RUN); + + /* fix up the transmit side */ + i = mp->tx_empty; + mp->tx_active = 0; + ++dev->stats.tx_errors; + if (mp->tx_bad_runt) { + mp->tx_bad_runt = 0; + } else if (i != mp->tx_fill) { + dev_kfree_skb_irq(mp->tx_bufs[i]); + if (++i >= N_TX_RING) + i = 0; + mp->tx_empty = i; + } + mp->tx_fullup = 0; + netif_wake_queue(dev); + if (i != mp->tx_fill) { + cp = mp->tx_cmds + NCMDS_TX * i; + out_le16(&cp->xfer_status, 0); + out_le16(&cp->command, OUTPUT_LAST); + out_le32(&td->cmdptr, virt_to_bus(cp)); + out_le32(&td->control, (RUN << 16) | RUN); + ++mp->tx_active; + mace_set_timeout(dev); + } + + /* turn it back on */ + out_8(&mb->imr, RCVINT); + out_8(&mb->maccc, mp->maccc); + +out: + spin_unlock_irqrestore(&mp->lock, flags); +} + +static irqreturn_t mace_txdma_intr(int irq, void *dev_id) +{ + return IRQ_HANDLED; +} + +static irqreturn_t mace_rxdma_intr(int irq, void *dev_id) +{ + struct net_device *dev = (struct net_device *) dev_id; + struct mace_data *mp = netdev_priv(dev); + volatile struct dbdma_regs __iomem *rd = mp->rx_dma; + volatile struct dbdma_cmd *cp, *np; + int i, nb, stat, next; + struct sk_buff *skb; + unsigned frame_status; + static int mace_lost_status; + unsigned char *data; + unsigned long flags; + + spin_lock_irqsave(&mp->lock, flags); + for (i = mp->rx_empty; i != mp->rx_fill; ) { + cp = mp->rx_cmds + i; + stat = le16_to_cpu(cp->xfer_status); + if ((stat & ACTIVE) == 0) { + next = i + 1; + if (next >= N_RX_RING) + next = 0; + np = mp->rx_cmds + next; + if (next != mp->rx_fill && + (le16_to_cpu(np->xfer_status) & ACTIVE) != 0) { + printk(KERN_DEBUG "mace: lost a status word\n"); + ++mace_lost_status; + } else + break; + } + nb = le16_to_cpu(cp->req_count) - le16_to_cpu(cp->res_count); + out_le16(&cp->command, DBDMA_STOP); + /* got a packet, have a look at it */ + skb = mp->rx_bufs[i]; + if (!skb) { + ++dev->stats.rx_dropped; + } else if (nb > 8) { + data = skb->data; + frame_status = (data[nb-3] << 8) + data[nb-4]; + if (frame_status & (RS_OFLO|RS_CLSN|RS_FRAMERR|RS_FCSERR)) { + ++dev->stats.rx_errors; + if (frame_status & RS_OFLO) + ++dev->stats.rx_over_errors; + if (frame_status & RS_FRAMERR) + ++dev->stats.rx_frame_errors; + if (frame_status & RS_FCSERR) + ++dev->stats.rx_crc_errors; + } else { + /* Mace feature AUTO_STRIP_RCV is on by default, dropping the + * FCS on frames with 802.3 headers. This means that Ethernet + * frames have 8 extra octets at the end, while 802.3 frames + * have only 4. We need to correctly account for this. */ + if (*(unsigned short *)(data+12) < 1536) /* 802.3 header */ + nb -= 4; + else /* Ethernet header; mace includes FCS */ + nb -= 8; + skb_put(skb, nb); + skb->protocol = eth_type_trans(skb, dev); + dev->stats.rx_bytes += skb->len; + netif_rx(skb); + mp->rx_bufs[i] = NULL; + ++dev->stats.rx_packets; + } + } else { + ++dev->stats.rx_errors; + ++dev->stats.rx_length_errors; + } + + /* advance to next */ + if (++i >= N_RX_RING) + i = 0; + } + mp->rx_empty = i; + + i = mp->rx_fill; + for (;;) { + next = i + 1; + if (next >= N_RX_RING) + next = 0; + if (next == mp->rx_empty) + break; + cp = mp->rx_cmds + i; + skb = mp->rx_bufs[i]; + if (!skb) { + skb = netdev_alloc_skb(dev, RX_BUFLEN + 2); + if (skb) { + skb_reserve(skb, 2); + mp->rx_bufs[i] = skb; + } + } + cp->req_count = cpu_to_le16(RX_BUFLEN); + data = skb? skb->data: dummy_buf; + cp->phy_addr = cpu_to_le32(virt_to_bus(data)); + out_le16(&cp->xfer_status, 0); + out_le16(&cp->command, INPUT_LAST + INTR_ALWAYS); +#if 0 + if ((le32_to_cpu(rd->status) & ACTIVE) != 0) { + out_le32(&rd->control, (PAUSE << 16) | PAUSE); + while ((in_le32(&rd->status) & ACTIVE) != 0) + ; + } +#endif + i = next; + } + if (i != mp->rx_fill) { + out_le32(&rd->control, ((RUN|WAKE) << 16) | (RUN|WAKE)); + mp->rx_fill = i; + } + spin_unlock_irqrestore(&mp->lock, flags); + return IRQ_HANDLED; +} + +static const struct of_device_id mace_match[] = +{ + { + .name = "mace", + }, + {}, +}; +MODULE_DEVICE_TABLE (of, mace_match); + +static struct macio_driver mace_driver = +{ + .driver = { + .name = "mace", + .owner = THIS_MODULE, + .of_match_table = mace_match, + }, + .probe = mace_probe, + .remove = mace_remove, +}; + + +static int __init mace_init(void) +{ + return macio_register_driver(&mace_driver); +} + +static void __exit mace_cleanup(void) +{ + macio_unregister_driver(&mace_driver); + + kfree(dummy_buf); + dummy_buf = NULL; +} + +MODULE_AUTHOR("Paul Mackerras"); +MODULE_DESCRIPTION("PowerMac MACE driver."); +module_param(port_aaui, int, 0); +MODULE_PARM_DESC(port_aaui, "MACE uses AAUI port (0-1)"); +MODULE_LICENSE("GPL"); + +module_init(mace_init); +module_exit(mace_cleanup); |