/* * Fast Ethernet Controller (FEC) driver for Motorola MPC8xx. * Copyright (c) 1997 Dan Malek (dmalek@jlc.net) * * Right now, I am very wasteful with the buffers. I allocate memory * pages and then divide them into 2K frame buffers. This way I know I * have buffers large enough to hold one frame within one buffer descriptor. * Once I get this working, I will use 64 or 128 byte CPM buffers, which * will be much more memory efficient and will easily handle lots of * small packets. * * Much better multiple PHY support by Magnus Damm. * Copyright (c) 2000 Ericsson Radio Systems AB. * * Support for FEC controller of ColdFire processors. * Copyright (c) 2001-2005 Greg Ungerer (gerg@snapgear.com) * * Bug fixes and cleanup by Philippe De Muyter (phdm@macqel.be) * Copyright (c) 2004-2006 Macq Electronique SA. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifndef CONFIG_ARCH_MXC #include #include #endif #include "fec.h" #ifdef CONFIG_ARCH_MXC #include #define FEC_ALIGNMENT 0xf #else #define FEC_ALIGNMENT 0x3 #endif /* * Define the fixed address of the FEC hardware. */ #if defined(CONFIG_M5272) static unsigned char fec_mac_default[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, }; /* * Some hardware gets it MAC address out of local flash memory. * if this is non-zero then assume it is the address to get MAC from. */ #if defined(CONFIG_NETtel) #define FEC_FLASHMAC 0xf0006006 #elif defined(CONFIG_GILBARCONAP) || defined(CONFIG_SCALES) #define FEC_FLASHMAC 0xf0006000 #elif defined(CONFIG_CANCam) #define FEC_FLASHMAC 0xf0020000 #elif defined (CONFIG_M5272C3) #define FEC_FLASHMAC (0xffe04000 + 4) #elif defined(CONFIG_MOD5272) #define FEC_FLASHMAC 0xffc0406b #else #define FEC_FLASHMAC 0 #endif #endif /* CONFIG_M5272 */ /* The number of Tx and Rx buffers. These are allocated from the page * pool. The code may assume these are power of two, so it it best * to keep them that size. * We don't need to allocate pages for the transmitter. We just use * the skbuffer directly. */ #define FEC_ENET_RX_PAGES 8 #define FEC_ENET_RX_FRSIZE 2048 #define FEC_ENET_RX_FRPPG (PAGE_SIZE / FEC_ENET_RX_FRSIZE) #define RX_RING_SIZE (FEC_ENET_RX_FRPPG * FEC_ENET_RX_PAGES) #define FEC_ENET_TX_FRSIZE 2048 #define FEC_ENET_TX_FRPPG (PAGE_SIZE / FEC_ENET_TX_FRSIZE) #define TX_RING_SIZE 16 /* Must be power of two */ #define TX_RING_MOD_MASK 15 /* for this to work */ #if (((RX_RING_SIZE + TX_RING_SIZE) * 8) > PAGE_SIZE) #error "FEC: descriptor ring size constants too large" #endif /* Interrupt events/masks. */ #define FEC_ENET_HBERR ((uint)0x80000000) /* Heartbeat error */ #define FEC_ENET_BABR ((uint)0x40000000) /* Babbling receiver */ #define FEC_ENET_BABT ((uint)0x20000000) /* Babbling transmitter */ #define FEC_ENET_GRA ((uint)0x10000000) /* Graceful stop complete */ #define FEC_ENET_TXF ((uint)0x08000000) /* Full frame transmitted */ #define FEC_ENET_TXB ((uint)0x04000000) /* A buffer was transmitted */ #define FEC_ENET_RXF ((uint)0x02000000) /* Full frame received */ #define FEC_ENET_RXB ((uint)0x01000000) /* A buffer was received */ #define FEC_ENET_MII ((uint)0x00800000) /* MII interrupt */ #define FEC_ENET_EBERR ((uint)0x00400000) /* SDMA bus error */ #define FEC_DEFAULT_IMASK (FEC_ENET_TXF | FEC_ENET_RXF | FEC_ENET_MII) /* The FEC stores dest/src/type, data, and checksum for receive packets. */ #define PKT_MAXBUF_SIZE 1518 #define PKT_MINBUF_SIZE 64 #define PKT_MAXBLR_SIZE 1520 /* * The 5270/5271/5280/5282/532x RX control register also contains maximum frame * size bits. Other FEC hardware does not, so we need to take that into * account when setting it. */ #if defined(CONFIG_M523x) || defined(CONFIG_M527x) || defined(CONFIG_M528x) || \ defined(CONFIG_M520x) || defined(CONFIG_M532x) || defined(CONFIG_ARCH_MXC) #define OPT_FRAME_SIZE (PKT_MAXBUF_SIZE << 16) #else #define OPT_FRAME_SIZE 0 #endif /* The FEC buffer descriptors track the ring buffers. The rx_bd_base and * tx_bd_base always point to the base of the buffer descriptors. The * cur_rx and cur_tx point to the currently available buffer. * The dirty_tx tracks the current buffer that is being sent by the * controller. The cur_tx and dirty_tx are equal under both completely * empty and completely full conditions. The empty/ready indicator in * the buffer descriptor determines the actual condition. */ struct fec_enet_private { /* Hardware registers of the FEC device */ void __iomem *hwp; struct net_device *netdev; struct clk *clk; /* The saved address of a sent-in-place packet/buffer, for skfree(). */ unsigned char *tx_bounce[TX_RING_SIZE]; struct sk_buff* tx_skbuff[TX_RING_SIZE]; struct sk_buff* rx_skbuff[RX_RING_SIZE]; ushort skb_cur; ushort skb_dirty; /* CPM dual port RAM relative addresses */ dma_addr_t bd_dma; /* Address of Rx and Tx buffers */ struct bufdesc *rx_bd_base; struct bufdesc *tx_bd_base; /* The next free ring entry */ struct bufdesc *cur_rx, *cur_tx; /* The ring entries to be free()ed */ struct bufdesc *dirty_tx; uint tx_full; /* hold while accessing the HW like ringbuffer for tx/rx but not MAC */ spinlock_t hw_lock; struct platform_device *pdev; int opened; /* Phylib and MDIO interface */ struct mii_bus *mii_bus; struct phy_device *phy_dev; int mii_timeout; uint phy_speed; phy_interface_t phy_interface; int index; int link; int full_duplex; struct completion mdio_done; }; static irqreturn_t fec_enet_interrupt(int irq, void * dev_id); static void fec_enet_tx(struct net_device *dev); static void fec_enet_rx(struct net_device *dev); static int fec_enet_close(struct net_device *dev); static void fec_restart(struct net_device *dev, int duplex); static void fec_stop(struct net_device *dev); /* FEC MII MMFR bits definition */ #define FEC_MMFR_ST (1 << 30) #define FEC_MMFR_OP_READ (2 << 28) #define FEC_MMFR_OP_WRITE (1 << 28) #define FEC_MMFR_PA(v) ((v & 0x1f) << 23) #define FEC_MMFR_RA(v) ((v & 0x1f) << 18) #define FEC_MMFR_TA (2 << 16) #define FEC_MMFR_DATA(v) (v & 0xffff) #define FEC_MII_TIMEOUT 1000 /* us */ /* Transmitter timeout */ #define TX_TIMEOUT (2 * HZ) static netdev_tx_t fec_enet_start_xmit(struct sk_buff *skb, struct net_device *dev) { struct fec_enet_private *fep = netdev_priv(dev); struct bufdesc *bdp; void *bufaddr; unsigned short status; unsigned long flags; if (!fep->link) { /* Link is down or autonegotiation is in progress. */ return NETDEV_TX_BUSY; } spin_lock_irqsave(&fep->hw_lock, flags); /* Fill in a Tx ring entry */ bdp = fep->cur_tx; status = bdp->cbd_sc; if (status & BD_ENET_TX_READY) { /* Ooops. All transmit buffers are full. Bail out. * This should not happen, since dev->tbusy should be set. */ printk("%s: tx queue full!.\n", dev->name); spin_unlock_irqrestore(&fep->hw_lock, flags); return NETDEV_TX_BUSY; } /* Clear all of the status flags */ status &= ~BD_ENET_TX_STATS; /* Set buffer length and buffer pointer */ bufaddr = skb->data; bdp->cbd_datlen = skb->len; /* * On some FEC implementations data must be aligned on * 4-byte boundaries. Use bounce buffers to copy data * and get it aligned. Ugh. */ if (((unsigned long) bufaddr) & FEC_ALIGNMENT) { unsigned int index; index = bdp - fep->tx_bd_base; memcpy(fep->tx_bounce[index], (void *)skb->data, skb->len); bufaddr = fep->tx_bounce[index]; } /* Save skb pointer */ fep->tx_skbuff[fep->skb_cur] = skb; dev->stats.tx_bytes += skb->len; fep->skb_cur = (fep->skb_cur+1) & TX_RING_MOD_MASK; /* Push the data cache so the CPM does not get stale memory * data. */ bdp->cbd_bufaddr = dma_map_single(&dev->dev, bufaddr, FEC_ENET_TX_FRSIZE, DMA_TO_DEVICE); /* Send it on its way. Tell FEC it's ready, interrupt when done, * it's the last BD of the frame, and to put the CRC on the end. */ status |= (BD_ENET_TX_READY | BD_ENET_TX_INTR | BD_ENET_TX_LAST | BD_ENET_TX_TC); bdp->cbd_sc = status; /* Trigger transmission start */ writel(0, fep->hwp + FEC_X_DES_ACTIVE); /* If this was the last BD in the ring, start at the beginning again. */ if (status & BD_ENET_TX_WRAP) bdp = fep->tx_bd_base; else bdp++; if (bdp == fep->dirty_tx) { fep->tx_full = 1; netif_stop_queue(dev); } fep->cur_tx = bdp; spin_unlock_irqrestore(&fep->hw_lock, flags); return NETDEV_TX_OK; } static void fec_timeout(struct net_device *dev) { struct fec_enet_private *fep = netdev_priv(dev); dev->stats.tx_errors++; fec_restart(dev, fep->full_duplex); netif_wake_queue(dev); } static irqreturn_t fec_enet_interrupt(int irq, void * dev_id) { struct net_device *dev = dev_id; struct fec_enet_private *fep = netdev_priv(dev); uint int_events; irqreturn_t ret = IRQ_NONE; do { int_events = readl(fep->hwp + FEC_IEVENT); writel(int_events, fep->hwp + FEC_IEVENT); if (int_events & FEC_ENET_RXF) { ret = IRQ_HANDLED; fec_enet_rx(dev); } /* Transmit OK, or non-fatal error. Update the buffer * descriptors. FEC handles all errors, we just discover * them as part of the transmit process. */ if (int_events & FEC_ENET_TXF) { ret = IRQ_HANDLED; fec_enet_tx(dev); } if (int_events & FEC_ENET_MII) { ret = IRQ_HANDLED; complete(&fep->mdio_done); } } while (int_events); return ret; } static void fec_enet_tx(struct net_device *dev) { struct fec_enet_private *fep; struct bufdesc *bdp; unsigned short status; struct sk_buff *skb; fep = netdev_priv(dev); spin_lock(&fep->hw_lock); bdp = fep->dirty_tx; while (((status = bdp->cbd_sc) & BD_ENET_TX_READY) == 0) { if (bdp == fep->cur_tx && fep->tx_full == 0) break; dma_unmap_single(&dev->dev, bdp->cbd_bufaddr, FEC_ENET_TX_FRSIZE, DMA_TO_DEVICE); bdp->cbd_bufaddr = 0; skb = fep->tx_skbuff[fep->skb_dirty]; /* Check for errors. */ if (status & (BD_ENET_TX_HB | BD_ENET_TX_LC | BD_ENET_TX_RL | BD_ENET_TX_UN | BD_ENET_TX_CSL)) { dev->stats.tx_errors++; if (status & BD_ENET_TX_HB) /* No heartbeat */ dev->stats.tx_heartbeat_errors++; if (status & BD_ENET_TX_LC) /* Late collision */ dev->stats.tx_window_errors++; if (status & BD_ENET_TX_RL) /* Retrans limit */ dev->stats.tx_aborted_errors++; if (status & BD_ENET_TX_UN) /* Underrun */ dev->stats.tx_fifo_errors++; if (status & BD_ENET_TX_CSL) /* Carrier lost */ dev->stats.tx_carrier_errors++; } else { dev->stats.tx_packets++; } if (status & BD_ENET_TX_READY) printk("HEY! Enet xmit interrupt and TX_READY.\n"); /* Deferred means some collisions occurred during transmit, * but we eventually sent the packet OK. */ if (status & BD_ENET_TX_DEF) dev->stats.collisions++; /* Free the sk buffer associated with this last transmit */ dev_kfree_skb_any(skb); fep->tx_skbuff[fep->skb_dirty] = NULL; fep->skb_dirty = (fep->skb_dirty + 1) & TX_RING_MOD_MASK; /* Update pointer to next buffer descriptor to be transmitted */ if (status & BD_ENET_TX_WRAP) bdp = fep->tx_bd_base; else bdp++; /* Since we have freed up a buffer, the ring is no longer full */ if (fep->tx_full) { fep->tx_full = 0; if (netif_queue_stopped(dev)) netif_wake_queue(dev); } } fep->dirty_tx = bdp; spin_unlock(&fep->hw_lock); } /* During a receive, the cur_rx points to the current incoming buffer. * When we update through the ring, if the next incoming buffer has * not been given to the system, we just set the empty indicator, * effectively tossing the packet. */ static void fec_enet_rx(struct net_device *dev) { struct fec_enet_private *fep = netdev_priv(dev); struct bufdesc *bdp; unsigned short status; struct sk_buff *skb; ushort pkt_len; __u8 *data; #ifdef CONFIG_M532x flush_cache_all(); #endif spin_lock(&fep->hw_lock); /* First, grab all of the stats for the incoming packet. * These get messed up if we get called due to a busy condition. */ bdp = fep->cur_rx; while (!((status = bdp->cbd_sc) & BD_ENET_RX_EMPTY)) { /* Since we have allocated space to hold a complete frame, * the last indicator should be set. */ if ((status & BD_ENET_RX_LAST) == 0) printk("FEC ENET: rcv is not +last\n"); if (!fep->opened) goto rx_processing_done; /* Check for errors. */ if (status & (BD_ENET_RX_LG | BD_ENET_RX_SH | BD_ENET_RX_NO | BD_ENET_RX_CR | BD_ENET_RX_OV)) { dev->stats.rx_errors++; if (status & (BD_ENET_RX_LG | BD_ENET_RX_SH)) { /* Frame too long or too short. */ dev->stats.rx_length_errors++; } if (status & BD_ENET_RX_NO) /* Frame alignment */ dev->stats.rx_frame_errors++; if (status & BD_ENET_RX_CR) /* CRC Error */ dev->stats.rx_crc_errors++; if (status & BD_ENET_RX_OV) /* FIFO overrun */ dev->stats.rx_fifo_errors++; } /* Report late collisions as a frame error. * On this error, the BD is closed, but we don't know what we * have in the buffer. So, just drop this frame on the floor. */ if (status & BD_ENET_RX_CL) { dev->stats.rx_errors++; dev->stats.rx_frame_errors++; goto rx_processing_done; } /* Process the incoming frame. */ dev->stats.rx_packets++; pkt_len = bdp->cbd_datlen; dev->stats.rx_bytes += pkt_len; data = (__u8*)__va(bdp->cbd_bufaddr); dma_unmap_single(NULL, bdp->cbd_bufaddr, bdp->cbd_datlen, DMA_FROM_DEVICE); /* This does 16 byte alignment, exactly what we need. * The packet length includes FCS, but we don't want to * include that when passing upstream as it messes up * bridging applications. */ skb = dev_alloc_skb(pkt_len - 4 + NET_IP_ALIGN); if (unlikely(!skb)) { printk("%s: Memory squeeze, dropping packet.\n", dev->name); dev->stats.rx_dropped++; } else { skb_reserve(skb, NET_IP_ALIGN); skb_put(skb, pkt_len - 4); /* Make room */ skb_copy_to_linear_data(skb, data, pkt_len - 4); skb->protocol = eth_type_trans(skb, dev); netif_rx(skb); } bdp->cbd_bufaddr = dma_map_single(NULL, data, bdp->cbd_datlen, DMA_FROM_DEVICE); rx_processing_done: /* Clear the status flags for this buffer */ status &= ~BD_ENET_RX_STATS; /* Mark the buffer empty */ status |= BD_ENET_RX_EMPTY; bdp->cbd_sc = status; /* Update BD pointer to next entry */ if (status & BD_ENET_RX_WRAP) bdp = fep->rx_bd_base; else bdp++; /* Doing this here will keep the FEC running while we process * incoming frames. On a heavily loaded network, we should be * able to keep up at the expense of system resources. */ writel(0, fep->hwp + FEC_R_DES_ACTIVE); } fep->cur_rx = bdp; spin_unlock(&fep->hw_lock); } /* ------------------------------------------------------------------------- */ #ifdef CONFIG_M5272 static void __inline__ fec_get_mac(struct net_device *dev) { struct fec_enet_private *fep = netdev_priv(dev); unsigned char *iap, tmpaddr[ETH_ALEN]; if (FEC_FLASHMAC) { /* * Get MAC address from FLASH. * If it is all 1's or 0's, use the default. */ iap = (unsigned char *)FEC_FLASHMAC; if ((iap[0] == 0) && (iap[1] == 0) && (iap[2] == 0) && (iap[3] == 0) && (iap[4] == 0) && (iap[5] == 0)) iap = fec_mac_default; if ((iap[0] == 0xff) && (iap[1] == 0xff) && (iap[2] == 0xff) && (iap[3] == 0xff) && (iap[4] == 0xff) && (iap[5] == 0xff)) iap = fec_mac_default; } else { *((unsigned long *) &tmpaddr[0]) = readl(fep->hwp + FEC_ADDR_LOW); *((unsigned short *) &tmpaddr[4]) = (readl(fep->hwp + FEC_ADDR_HIGH) >> 16); iap = &tmpaddr[0]; } memcpy(dev->dev_addr, iap, ETH_ALEN); /* Adjust MAC if using default MAC address */ if (iap == fec_mac_default) dev->dev_addr[ETH_ALEN-1] = fec_mac_default[ETH_ALEN-1] + fep->index; } #endif /* ------------------------------------------------------------------------- */ /* * Phy section */ static void fec_enet_adjust_link(struct net_device *dev) { struct fec_enet_private *fep = netdev_priv(dev); struct phy_device *phy_dev = fep->phy_dev; unsigned long flags; int status_change = 0; spin_lock_irqsave(&fep->hw_lock, flags); /* Prevent a state halted on mii error */ if (fep->mii_timeout && phy_dev->state == PHY_HALTED) { phy_dev->state = PHY_RESUMING; goto spin_unlock; } /* Duplex link change */ if (phy_dev->link) { if (fep->full_duplex != phy_dev->duplex) { fec_restart(dev, phy_dev->duplex); status_change = 1; } } /* Link on or off change */ if (phy_dev->link != fep->link) { fep->link = phy_dev->link; if (phy_dev->link) fec_restart(dev, phy_dev->duplex); else fec_stop(dev); status_change = 1; } spin_unlock: spin_unlock_irqrestore(&fep->hw_lock, flags); if (status_change) phy_print_status(phy_dev); } static int fec_enet_mdio_read(struct mii_bus *bus, int mii_id, int regnum) { struct fec_enet_private *fep = bus->priv; unsigned long time_left; fep->mii_timeout = 0; init_completion(&fep->mdio_done); /* start a read op */ writel(FEC_MMFR_ST | FEC_MMFR_OP_READ | FEC_MMFR_PA(mii_id) | FEC_MMFR_RA(regnum) | FEC_MMFR_TA, fep->hwp + FEC_MII_DATA); /* wait for end of transfer */ time_left = wait_for_completion_timeout(&fep->mdio_done, usecs_to_jiffies(FEC_MII_TIMEOUT)); if (time_left == 0) { fep->mii_timeout = 1; printk(KERN_ERR "FEC: MDIO read timeout\n"); return -ETIMEDOUT; } /* return value */ return FEC_MMFR_DATA(readl(fep->hwp + FEC_MII_DATA)); } static int fec_enet_mdio_write(struct mii_bus *bus, int mii_id, int regnum, u16 value) { struct fec_enet_private *fep = bus->priv; unsigned long time_left; fep->mii_timeout = 0; init_completion(&fep->mdio_done); /* start a read op */ writel(FEC_MMFR_ST | FEC_MMFR_OP_READ | FEC_MMFR_PA(mii_id) | FEC_MMFR_RA(regnum) | FEC_MMFR_TA | FEC_MMFR_DATA(value), fep->hwp + FEC_MII_DATA); /* wait for end of transfer */ time_left = wait_for_completion_timeout(&fep->mdio_done, usecs_to_jiffies(FEC_MII_TIMEOUT)); if (time_left == 0) { fep->mii_timeout = 1; printk(KERN_ERR "FEC: MDIO write timeout\n"); return -ETIMEDOUT; } return 0; } static int fec_enet_mdio_reset(struct mii_bus *bus) { return 0; } static int fec_enet_mii_probe(struct net_device *dev) { struct fec_enet_private *fep = netdev_priv(dev); struct phy_device *phy_dev = NULL; char mdio_bus_id[MII_BUS_ID_SIZE]; char phy_name[MII_BUS_ID_SIZE + 3]; int phy_id; fep->phy_dev = NULL; /* check for attached phy */ for (phy_id = 0; (phy_id < PHY_MAX_ADDR); phy_id++) { if ((fep->mii_bus->phy_mask & (1 << phy_id))) continue; if (fep->mii_bus->phy_map[phy_id] == NULL) continue; if (fep->mii_bus->phy_map[phy_id]->phy_id == 0) continue; strncpy(mdio_bus_id, fep->mii_bus->id, MII_BUS_ID_SIZE); break; } if (phy_id >= PHY_MAX_ADDR) { printk(KERN_INFO "%s: no PHY, assuming direct connection " "to switch\n", dev->name); strncpy(mdio_bus_id, "0", MII_BUS_ID_SIZE); phy_id = 0; } snprintf(phy_name, MII_BUS_ID_SIZE, PHY_ID_FMT, mdio_bus_id, phy_id); phy_dev = phy_connect(dev, phy_name, &fec_enet_adjust_link, 0, PHY_INTERFACE_MODE_MII); if (IS_ERR(phy_dev)) { printk(KERN_ERR "%s: could not attach to PHY\n", dev->name); return PTR_ERR(phy_dev); } /* mask with MAC supported features */ phy_dev->supported &= PHY_BASIC_FEATURES; phy_dev->advertising = phy_dev->supported; fep->phy_dev = phy_dev; fep->link = 0; fep->full_duplex = 0; printk(KERN_INFO "%s: Freescale FEC PHY driver [%s] " "(mii_bus:phy_addr=%s, irq=%d)\n", dev->name, fep->phy_dev->drv->name, dev_name(&fep->phy_dev->dev), fep->phy_dev->irq); return 0; } static int fec_enet_mii_init(struct platform_device *pdev) { struct net_device *dev = platform_get_drvdata(pdev); struct fec_enet_private *fep = netdev_priv(dev); int err = -ENXIO, i; fep->mii_timeout = 0; /* * Set MII speed to 2.5 MHz (= clk_get_rate() / 2 * phy_speed) */ fep->phy_speed = DIV_ROUND_UP(clk_get_rate(fep->clk), 5000000) << 1; writel(fep->phy_speed, fep->hwp + FEC_MII_SPEED); fep->mii_bus = mdiobus_alloc(); if (fep->mii_bus == NULL) { err = -ENOMEM; goto err_out; } fep->mii_bus->name = "fec_enet_mii_bus"; fep->mii_bus->read = fec_enet_mdio_read; fep->mii_bus->write = fec_enet_mdio_write; fep->mii_bus->reset = fec_enet_mdio_reset; snprintf(fep->mii_bus->id, MII_BUS_ID_SIZE, "%x", pdev->id + 1); fep->mii_bus->priv = fep; fep->mii_bus->parent = &pdev->dev; fep->mii_bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL); if (!fep->mii_bus->irq) { err = -ENOMEM; goto err_out_free_mdiobus; } for (i = 0; i < PHY_MAX_ADDR; i++) fep->mii_bus->irq[i] = PHY_POLL; platform_set_drvdata(dev, fep->mii_bus); if (mdiobus_register(fep->mii_bus)) goto err_out_free_mdio_irq; return 0; err_out_free_mdio_irq: kfree(fep->mii_bus->irq); err_out_free_mdiobus: mdiobus_free(fep->mii_bus); err_out: return err; } static void fec_enet_mii_remove(struct fec_enet_private *fep) { if (fep->phy_dev) phy_disconnect(fep->phy_dev); mdiobus_unregister(fep->mii_bus); kfree(fep->mii_bus->irq); mdiobus_free(fep->mii_bus); } static int fec_enet_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) { struct fec_enet_private *fep = netdev_priv(dev); struct phy_device *phydev = fep->phy_dev; if (!phydev) return -ENODEV; return phy_ethtool_gset(phydev, cmd); } static int fec_enet_set_settings(struct net_device *dev, struct ethtool_cmd *cmd) { struct fec_enet_private *fep = netdev_priv(dev); struct phy_device *phydev = fep->phy_dev; if (!phydev) return -ENODEV; return phy_ethtool_sset(phydev, cmd); } static void fec_enet_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) { struct fec_enet_private *fep = netdev_priv(dev); strcpy(info->driver, fep->pdev->dev.driver->name); strcpy(info->version, "Revision: 1.0"); strcpy(info->bus_info, dev_name(&dev->dev)); } static struct ethtool_ops fec_enet_ethtool_ops = { .get_settings = fec_enet_get_settings, .set_settings = fec_enet_set_settings, .get_drvinfo = fec_enet_get_drvinfo, .get_link = ethtool_op_get_link, }; static int fec_enet_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) { struct fec_enet_private *fep = netdev_priv(dev); struct phy_device *phydev = fep->phy_dev; if (!netif_running(dev)) return -EINVAL; if (!phydev) return -ENODEV; return phy_mii_ioctl(phydev, rq, cmd); } static void fec_enet_free_buffers(struct net_device *dev) { struct fec_enet_private *fep = netdev_priv(dev); int i; struct sk_buff *skb; struct bufdesc *bdp; bdp = fep->rx_bd_base; for (i = 0; i < RX_RING_SIZE; i++) { skb = fep->rx_skbuff[i]; if (bdp->cbd_bufaddr) dma_unmap_single(&dev->dev, bdp->cbd_bufaddr, FEC_ENET_RX_FRSIZE, DMA_FROM_DEVICE); if (skb) dev_kfree_skb(skb); bdp++; } bdp = fep->tx_bd_base; for (i = 0; i < TX_RING_SIZE; i++) kfree(fep->tx_bounce[i]); } static int fec_enet_alloc_buffers(struct net_device *dev) { struct fec_enet_private *fep = netdev_priv(dev); int i; struct sk_buff *skb; struct bufdesc *bdp; bdp = fep->rx_bd_base; for (i = 0; i < RX_RING_SIZE; i++) { skb = dev_alloc_skb(FEC_ENET_RX_FRSIZE); if (!skb) { fec_enet_free_buffers(dev); return -ENOMEM; } fep->rx_skbuff[i] = skb; bdp->cbd_bufaddr = dma_map_single(&dev->dev, skb->data, FEC_ENET_RX_FRSIZE, DMA_FROM_DEVICE); bdp->cbd_sc = BD_ENET_RX_EMPTY; bdp++; } /* Set the last buffer to wrap. */ bdp--; bdp->cbd_sc |= BD_SC_WRAP; bdp = fep->tx_bd_base; for (i = 0; i < TX_RING_SIZE; i++) { fep->tx_bounce[i] = kmalloc(FEC_ENET_TX_FRSIZE, GFP_KERNEL); bdp->cbd_sc = 0; bdp->cbd_bufaddr = 0; bdp++; } /* Set the last buffer to wrap. */ bdp--; bdp->cbd_sc |= BD_SC_WRAP; return 0; } static int fec_enet_open(struct net_device *dev) { struct fec_enet_private *fep = netdev_priv(dev); int ret; /* I should reset the ring buffers here, but I don't yet know * a simple way to do that. */ ret = fec_enet_alloc_buffers(dev); if (ret) return ret; /* Probe and connect to PHY when open the interface */ ret = fec_enet_mii_probe(dev); if (ret) { fec_enet_free_buffers(dev); return ret; } phy_start(fep->phy_dev); netif_start_queue(dev); fep->opened = 1; return 0; } static int fec_enet_close(struct net_device *dev) { struct fec_enet_private *fep = netdev_priv(dev); /* Don't know what to do yet. */ fep->opened = 0; netif_stop_queue(dev); fec_stop(dev); if (fep->phy_dev) phy_disconnect(fep->phy_dev); fec_enet_free_buffers(dev); return 0; } /* Set or clear the multicast filter for this adaptor. * Skeleton taken from sunlance driver. * The CPM Ethernet implementation allows Multicast as well as individual * MAC address filtering. Some of the drivers check to make sure it is * a group multicast address, and discard those that are not. I guess I * will do the same for now, but just remove the test if you want * individual filtering as well (do the upper net layers want or support * this kind of feature?). */ #define HASH_BITS 6 /* #bits in hash */ #define CRC32_POLY 0xEDB88320 static void set_multicast_list(struct net_device *dev) { struct fec_enet_private *fep = netdev_priv(dev); struct netdev_hw_addr *ha; unsigned int i, bit, data, crc, tmp; unsigned char hash; if (dev->flags & IFF_PROMISC) { tmp = readl(fep->hwp + FEC_R_CNTRL); tmp |= 0x8; writel(tmp, fep->hwp + FEC_R_CNTRL); return; } tmp = readl(fep->hwp + FEC_R_CNTRL); tmp &= ~0x8; writel(tmp, fep->hwp + FEC_R_CNTRL); if (dev->flags & IFF_ALLMULTI) { /* Catch all multicast addresses, so set the * filter to all 1's */ writel(0xffffffff, fep->hwp + FEC_GRP_HASH_TABLE_HIGH); writel(0xffffffff, fep->hwp + FEC_GRP_HASH_TABLE_LOW); return; } /* Clear filter and add the addresses in hash register */ writel(0, fep->hwp + FEC_GRP_HASH_TABLE_HIGH); writel(0, fep->hwp + FEC_GRP_HASH_TABLE_LOW); netdev_for_each_mc_addr(ha, dev) { /* Only support group multicast for now */ if (!(ha->addr[0] & 1)) continue; /* calculate crc32 value of mac address */ crc = 0xffffffff; for (i = 0; i < dev->addr_len; i++) { data = ha->addr[i]; for (bit = 0; bit < 8; bit++, data >>= 1) { crc = (crc >> 1) ^ (((crc ^ data) & 1) ? CRC32_POLY : 0); } } /* only upper 6 bits (HASH_BITS) are used * which point to specific bit in he hash registers */ hash = (crc >> (32 - HASH_BITS)) & 0x3f; if (hash > 31) { tmp = readl(fep->hwp + FEC_GRP_HASH_TABLE_HIGH); tmp |= 1 << (hash - 32); writel(tmp, fep->hwp + FEC_GRP_HASH_TABLE_HIGH); } else { tmp = readl(fep->hwp + FEC_GRP_HASH_TABLE_LOW); tmp |= 1 << hash; writel(tmp, fep->hwp + FEC_GRP_HASH_TABLE_LOW); } } } /* Set a MAC change in hardware. */ static int fec_set_mac_address(struct net_device *dev, void *p) { struct fec_enet_private *fep = netdev_priv(dev); struct sockaddr *addr = p; if (!is_valid_ether_addr(addr->sa_data)) return -EADDRNOTAVAIL; memcpy(dev->dev_addr, addr->sa_data, dev->addr_len); writel(dev->dev_addr[3] | (dev->dev_addr[2] << 8) | (dev->dev_addr[1] << 16) | (dev->dev_addr[0] << 24), fep->hwp + FEC_ADDR_LOW); writel((dev->dev_addr[5] << 16) | (dev->dev_addr[4] << 24), fep->hwp + FEC_ADDR_HIGH); return 0; } static const struct net_device_ops fec_netdev_ops = { .ndo_open = fec_enet_open, .ndo_stop = fec_enet_close, .ndo_start_xmit = fec_enet_start_xmit, .ndo_set_multicast_list = set_multicast_list, .ndo_change_mtu = eth_change_mtu, .ndo_validate_addr = eth_validate_addr, .ndo_tx_timeout = fec_timeout, .ndo_set_mac_address = fec_set_mac_address, .ndo_do_ioctl = fec_enet_ioctl, }; /* * XXX: We need to clean up on failure exits here. * * index is only used in legacy code */ static int fec_enet_init(struct net_device *dev, int index) { struct fec_enet_private *fep = netdev_priv(dev); struct bufdesc *cbd_base; struct bufdesc *bdp; int i; /* Allocate memory for buffer descriptors. */ cbd_base = dma_alloc_coherent(NULL, PAGE_SIZE, &fep->bd_dma, GFP_KERNEL); if (!cbd_base) { printk("FEC: allocate descriptor memory failed?\n"); return -ENOMEM; } spin_lock_init(&fep->hw_lock); fep->index = index; fep->hwp = (void __iomem *)dev->base_addr; fep->netdev = dev; /* Set the Ethernet address */ #ifdef CONFIG_M5272 fec_get_mac(dev); #else { unsigned long l; l = readl(fep->hwp + FEC_ADDR_LOW); dev->dev_addr[0] = (unsigned char)((l & 0xFF000000) >> 24); dev->dev_addr[1] = (unsigned char)((l & 0x00FF0000) >> 16); dev->dev_addr[2] = (unsigned char)((l & 0x0000FF00) >> 8); dev->dev_addr[3] = (unsigned char)((l & 0x000000FF) >> 0); l = readl(fep->hwp + FEC_ADDR_HIGH); dev->dev_addr[4] = (unsigned char)((l & 0xFF000000) >> 24); dev->dev_addr[5] = (unsigned char)((l & 0x00FF0000) >> 16); } #endif /* Set receive and transmit descriptor base. */ fep->rx_bd_base = cbd_base; fep->tx_bd_base = cbd_base + RX_RING_SIZE; /* The FEC Ethernet specific entries in the device structure */ dev->watchdog_timeo = TX_TIMEOUT; dev->netdev_ops = &fec_netdev_ops; dev->ethtool_ops = &fec_enet_ethtool_ops; /* Initialize the receive buffer descriptors. */ bdp = fep->rx_bd_base; for (i = 0; i < RX_RING_SIZE; i++) { /* Initialize the BD for every fragment in the page. */ bdp->cbd_sc = 0; bdp++; } /* Set the last buffer to wrap */ bdp--; bdp->cbd_sc |= BD_SC_WRAP; /* ...and the same for transmit */ bdp = fep->tx_bd_base; for (i = 0; i < TX_RING_SIZE; i++) { /* Initialize the BD for every fragment in the page. */ bdp->cbd_sc = 0; bdp->cbd_bufaddr = 0; bdp++; } /* Set the last buffer to wrap */ bdp--; bdp->cbd_sc |= BD_SC_WRAP; fec_restart(dev, 0); return 0; } /* This function is called to start or restart the FEC during a link * change. This only happens when switching between half and full * duplex. */ static void fec_restart(struct net_device *dev, int duplex) { struct fec_enet_private *fep = netdev_priv(dev); int i; /* Whack a reset. We should wait for this. */ writel(1, fep->hwp + FEC_ECNTRL); udelay(10); /* Clear any outstanding interrupt. */ writel(0xffc00000, fep->hwp + FEC_IEVENT); /* Reset all multicast. */ writel(0, fep->hwp + FEC_GRP_HASH_TABLE_HIGH); writel(0, fep->hwp + FEC_GRP_HASH_TABLE_LOW); #ifndef CONFIG_M5272 writel(0, fep->hwp + FEC_HASH_TABLE_HIGH); writel(0, fep->hwp + FEC_HASH_TABLE_LOW); #endif /* Set maximum receive buffer size. */ writel(PKT_MAXBLR_SIZE, fep->hwp + FEC_R_BUFF_SIZE); /* Set receive and transmit descriptor base. */ writel(fep->bd_dma, fep->hwp + FEC_R_DES_START); writel((unsigned long)fep->bd_dma + sizeof(struct bufdesc) * RX_RING_SIZE, fep->hwp + FEC_X_DES_START); fep->dirty_tx = fep->cur_tx = fep->tx_bd_base; fep->cur_rx = fep->rx_bd_base; /* Reset SKB transmit buffers. */ fep->skb_cur = fep->skb_dirty = 0; for (i = 0; i <= TX_RING_MOD_MASK; i++) { if (fep->tx_skbuff[i]) { dev_kfree_skb_any(fep->tx_skbuff[i]); fep->tx_skbuff[i] = NULL; } } /* Enable MII mode */ if (duplex) { /* MII enable / FD enable */ writel(OPT_FRAME_SIZE | 0x04, fep->hwp + FEC_R_CNTRL); writel(0x04, fep->hwp + FEC_X_CNTRL); } else { /* MII enable / No Rcv on Xmit */ writel(OPT_FRAME_SIZE | 0x06, fep->hwp + FEC_R_CNTRL); writel(0x0, fep->hwp + FEC_X_CNTRL); } fep->full_duplex = duplex; /* Set MII speed */ writel(fep->phy_speed, fep->hwp + FEC_MII_SPEED); #ifdef FEC_MIIGSK_ENR if (fep->phy_interface == PHY_INTERFACE_MODE_RMII) { /* disable the gasket and wait */ writel(0, fep->hwp + FEC_MIIGSK_ENR); while (readl(fep->hwp + FEC_MIIGSK_ENR) & 4) udelay(1); /* configure the gasket: RMII, 50 MHz, no loopback, no echo */ writel(1, fep->hwp + FEC_MIIGSK_CFGR); /* re-enable the gasket */ writel(2, fep->hwp + FEC_MIIGSK_ENR); } #endif /* And last, enable the transmit and receive processing */ writel(2, fep->hwp + FEC_ECNTRL); writel(0, fep->hwp + FEC_R_DES_ACTIVE); /* Enable interrupts we wish to service */ writel(FEC_DEFAULT_IMASK, fep->hwp + FEC_IMASK); } static void fec_stop(struct net_device *dev) { struct fec_enet_private *fep = netdev_priv(dev); /* We cannot expect a graceful transmit stop without link !!! */ if (fep->link) { writel(1, fep->hwp + FEC_X_CNTRL); /* Graceful transmit stop */ udelay(10); if (!(readl(fep->hwp + FEC_IEVENT) & FEC_ENET_GRA)) printk("fec_stop : Graceful transmit stop did not complete !\n"); } /* Whack a reset. We should wait for this. */ writel(1, fep->hwp + FEC_ECNTRL); udelay(10); writel(fep->phy_speed, fep->hwp + FEC_MII_SPEED); writel(FEC_DEFAULT_IMASK, fep->hwp + FEC_IMASK); } static int __devinit fec_probe(struct platform_device *pdev) { struct fec_enet_private *fep; struct fec_platform_data *pdata; struct net_device *ndev; int i, irq, ret = 0; struct resource *r; r = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!r) return -ENXIO; r = request_mem_region(r->start, resource_size(r), pdev->name); if (!r) return -EBUSY; /* Init network device */ ndev = alloc_etherdev(sizeof(struct fec_enet_private)); if (!ndev) return -ENOMEM; SET_NETDEV_DEV(ndev, &pdev->dev); /* setup board info structure */ fep = netdev_priv(ndev); memset(fep, 0, sizeof(*fep)); ndev->base_addr = (unsigned long)ioremap(r->start, resource_size(r)); fep->pdev = pdev; if (!ndev->base_addr) { ret = -ENOMEM; goto failed_ioremap; } platform_set_drvdata(pdev, ndev); pdata = pdev->dev.platform_data; if (pdata) fep->phy_interface = pdata->phy; /* This device has up to three irqs on some platforms */ for (i = 0; i < 3; i++) { irq = platform_get_irq(pdev, i); if (i && irq < 0) break; ret = request_irq(irq, fec_enet_interrupt, IRQF_DISABLED, pdev->name, ndev); if (ret) { while (i >= 0) { irq = platform_get_irq(pdev, i); free_irq(irq, ndev); i--; } goto failed_irq; } } fep->clk = clk_get(&pdev->dev, "fec_clk"); if (IS_ERR(fep->clk)) { ret = PTR_ERR(fep->clk); goto failed_clk; } clk_enable(fep->clk); ret = fec_enet_init(ndev, 0); if (ret) goto failed_init; ret = fec_enet_mii_init(pdev); if (ret) goto failed_mii_init; /* Carrier starts down, phylib will bring it up */ netif_carrier_off(ndev); ret = register_netdev(ndev); if (ret) goto failed_register; return 0; failed_register: fec_enet_mii_remove(fep); failed_mii_init: failed_init: clk_disable(fep->clk); clk_put(fep->clk); failed_clk: for (i = 0; i < 3; i++) { irq = platform_get_irq(pdev, i); if (irq > 0) free_irq(irq, ndev); } failed_irq: iounmap((void __iomem *)ndev->base_addr); failed_ioremap: free_netdev(ndev); return ret; } static int __devexit fec_drv_remove(struct platform_device *pdev) { struct net_device *ndev = platform_get_drvdata(pdev); struct fec_enet_private *fep = netdev_priv(ndev); platform_set_drvdata(pdev, NULL); fec_stop(ndev); fec_enet_mii_remove(fep); clk_disable(fep->clk); clk_put(fep->clk); iounmap((void __iomem *)ndev->base_addr); unregister_netdev(ndev); free_netdev(ndev); return 0; } #ifdef CONFIG_PM static int fec_suspend(struct device *dev) { struct net_device *ndev = dev_get_drvdata(dev); struct fec_enet_private *fep; if (ndev) { fep = netdev_priv(ndev); if (netif_running(ndev)) fec_enet_close(ndev); clk_disable(fep->clk); } return 0; } static int fec_resume(struct device *dev) { struct net_device *ndev = dev_get_drvdata(dev); struct fec_enet_private *fep; if (ndev) { fep = netdev_priv(ndev); clk_enable(fep->clk); if (netif_running(ndev)) fec_enet_open(ndev); } return 0; } static const struct dev_pm_ops fec_pm_ops = { .suspend = fec_suspend, .resume = fec_resume, .freeze = fec_suspend, .thaw = fec_resume, .poweroff = fec_suspend, .restore = fec_resume, }; #endif static struct platform_driver fec_driver = { .driver = { .name = "fec", .owner = THIS_MODULE, #ifdef CONFIG_PM .pm = &fec_pm_ops, #endif }, .probe = fec_probe, .remove = __devexit_p(fec_drv_remove), }; static int __init fec_enet_module_init(void) { printk(KERN_INFO "FEC Ethernet Driver\n"); return platform_driver_register(&fec_driver); } static void __exit fec_enet_cleanup(void) { platform_driver_unregister(&fec_driver); } module_exit(fec_enet_cleanup); module_init(fec_enet_module_init); MODULE_LICENSE("GPL");