/* * Cadence MACB/GEM Ethernet Controller driver * * Copyright (C) 2004-2006 Atmel Corporation * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "macb.h" #define RX_BUFFER_SIZE 128 #define RX_RING_SIZE 512 /* must be power of 2 */ #define RX_RING_BYTES (sizeof(struct macb_dma_desc) * RX_RING_SIZE) #define TX_RING_SIZE 128 /* must be power of 2 */ #define TX_RING_BYTES (sizeof(struct macb_dma_desc) * TX_RING_SIZE) /* minimum number of free TX descriptors before waking up TX process */ #define MACB_TX_WAKEUP_THRESH (TX_RING_SIZE / 4) #define MACB_RX_INT_FLAGS (MACB_BIT(RCOMP) | MACB_BIT(RXUBR) \ | MACB_BIT(ISR_ROVR)) #define MACB_TX_ERR_FLAGS (MACB_BIT(ISR_TUND) \ | MACB_BIT(ISR_RLE) \ | MACB_BIT(TXERR)) #define MACB_TX_INT_FLAGS (MACB_TX_ERR_FLAGS | MACB_BIT(TCOMP)) /* * Graceful stop timeouts in us. We should allow up to * 1 frame time (10 Mbits/s, full-duplex, ignoring collisions) */ #define MACB_HALT_TIMEOUT 1230 /* Ring buffer accessors */ static unsigned int macb_tx_ring_wrap(unsigned int index) { return index & (TX_RING_SIZE - 1); } static unsigned int macb_tx_ring_avail(struct macb *bp) { return (bp->tx_tail - bp->tx_head) & (TX_RING_SIZE - 1); } static struct macb_dma_desc *macb_tx_desc(struct macb *bp, unsigned int index) { return &bp->tx_ring[macb_tx_ring_wrap(index)]; } static struct macb_tx_skb *macb_tx_skb(struct macb *bp, unsigned int index) { return &bp->tx_skb[macb_tx_ring_wrap(index)]; } static dma_addr_t macb_tx_dma(struct macb *bp, unsigned int index) { dma_addr_t offset; offset = macb_tx_ring_wrap(index) * sizeof(struct macb_dma_desc); return bp->tx_ring_dma + offset; } static unsigned int macb_rx_ring_wrap(unsigned int index) { return index & (RX_RING_SIZE - 1); } static struct macb_dma_desc *macb_rx_desc(struct macb *bp, unsigned int index) { return &bp->rx_ring[macb_rx_ring_wrap(index)]; } static void *macb_rx_buffer(struct macb *bp, unsigned int index) { return bp->rx_buffers + RX_BUFFER_SIZE * macb_rx_ring_wrap(index); } static void __macb_set_hwaddr(struct macb *bp) { u32 bottom; u16 top; bottom = cpu_to_le32(*((u32 *)bp->dev->dev_addr)); macb_or_gem_writel(bp, SA1B, bottom); top = cpu_to_le16(*((u16 *)(bp->dev->dev_addr + 4))); macb_or_gem_writel(bp, SA1T, top); } static void __init macb_get_hwaddr(struct macb *bp) { u32 bottom; u16 top; u8 addr[6]; bottom = macb_or_gem_readl(bp, SA1B); top = macb_or_gem_readl(bp, SA1T); addr[0] = bottom & 0xff; addr[1] = (bottom >> 8) & 0xff; addr[2] = (bottom >> 16) & 0xff; addr[3] = (bottom >> 24) & 0xff; addr[4] = top & 0xff; addr[5] = (top >> 8) & 0xff; if (is_valid_ether_addr(addr)) { memcpy(bp->dev->dev_addr, addr, sizeof(addr)); } else { netdev_info(bp->dev, "invalid hw address, using random\n"); eth_hw_addr_random(bp->dev); } } static int macb_mdio_read(struct mii_bus *bus, int mii_id, int regnum) { struct macb *bp = bus->priv; int value; macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_SOF) | MACB_BF(RW, MACB_MAN_READ) | MACB_BF(PHYA, mii_id) | MACB_BF(REGA, regnum) | MACB_BF(CODE, MACB_MAN_CODE))); /* wait for end of transfer */ while (!MACB_BFEXT(IDLE, macb_readl(bp, NSR))) cpu_relax(); value = MACB_BFEXT(DATA, macb_readl(bp, MAN)); return value; } static int macb_mdio_write(struct mii_bus *bus, int mii_id, int regnum, u16 value) { struct macb *bp = bus->priv; macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_SOF) | MACB_BF(RW, MACB_MAN_WRITE) | MACB_BF(PHYA, mii_id) | MACB_BF(REGA, regnum) | MACB_BF(CODE, MACB_MAN_CODE) | MACB_BF(DATA, value))); /* wait for end of transfer */ while (!MACB_BFEXT(IDLE, macb_readl(bp, NSR))) cpu_relax(); return 0; } static int macb_mdio_reset(struct mii_bus *bus) { return 0; } static void macb_handle_link_change(struct net_device *dev) { struct macb *bp = netdev_priv(dev); struct phy_device *phydev = bp->phy_dev; unsigned long flags; int status_change = 0; spin_lock_irqsave(&bp->lock, flags); if (phydev->link) { if ((bp->speed != phydev->speed) || (bp->duplex != phydev->duplex)) { u32 reg; reg = macb_readl(bp, NCFGR); reg &= ~(MACB_BIT(SPD) | MACB_BIT(FD)); if (macb_is_gem(bp)) reg &= ~GEM_BIT(GBE); if (phydev->duplex) reg |= MACB_BIT(FD); if (phydev->speed == SPEED_100) reg |= MACB_BIT(SPD); if (phydev->speed == SPEED_1000) reg |= GEM_BIT(GBE); macb_or_gem_writel(bp, NCFGR, reg); bp->speed = phydev->speed; bp->duplex = phydev->duplex; status_change = 1; } } if (phydev->link != bp->link) { if (!phydev->link) { bp->speed = 0; bp->duplex = -1; } bp->link = phydev->link; status_change = 1; } spin_unlock_irqrestore(&bp->lock, flags); if (status_change) { if (phydev->link) { netif_carrier_on(dev); netdev_info(dev, "link up (%d/%s)\n", phydev->speed, phydev->duplex == DUPLEX_FULL ? "Full" : "Half"); } else { netif_carrier_off(dev); netdev_info(dev, "link down\n"); } } } /* based on au1000_eth. c*/ static int macb_mii_probe(struct net_device *dev) { struct macb *bp = netdev_priv(dev); struct phy_device *phydev; int ret; phydev = phy_find_first(bp->mii_bus); if (!phydev) { netdev_err(dev, "no PHY found\n"); return -1; } /* TODO : add pin_irq */ /* attach the mac to the phy */ ret = phy_connect_direct(dev, phydev, &macb_handle_link_change, 0, bp->phy_interface); if (ret) { netdev_err(dev, "Could not attach to PHY\n"); return ret; } /* mask with MAC supported features */ if (macb_is_gem(bp)) phydev->supported &= PHY_GBIT_FEATURES; else phydev->supported &= PHY_BASIC_FEATURES; phydev->advertising = phydev->supported; bp->link = 0; bp->speed = 0; bp->duplex = -1; bp->phy_dev = phydev; return 0; } int macb_mii_init(struct macb *bp) { struct macb_platform_data *pdata; int err = -ENXIO, i; /* Enable management port */ macb_writel(bp, NCR, MACB_BIT(MPE)); bp->mii_bus = mdiobus_alloc(); if (bp->mii_bus == NULL) { err = -ENOMEM; goto err_out; } bp->mii_bus->name = "MACB_mii_bus"; bp->mii_bus->read = &macb_mdio_read; bp->mii_bus->write = &macb_mdio_write; bp->mii_bus->reset = &macb_mdio_reset; snprintf(bp->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x", bp->pdev->name, bp->pdev->id); bp->mii_bus->priv = bp; bp->mii_bus->parent = &bp->dev->dev; pdata = bp->pdev->dev.platform_data; if (pdata) bp->mii_bus->phy_mask = pdata->phy_mask; bp->mii_bus->irq = kmalloc(sizeof(int)*PHY_MAX_ADDR, GFP_KERNEL); if (!bp->mii_bus->irq) { err = -ENOMEM; goto err_out_free_mdiobus; } for (i = 0; i < PHY_MAX_ADDR; i++) bp->mii_bus->irq[i] = PHY_POLL; dev_set_drvdata(&bp->dev->dev, bp->mii_bus); if (mdiobus_register(bp->mii_bus)) goto err_out_free_mdio_irq; if (macb_mii_probe(bp->dev) != 0) { goto err_out_unregister_bus; } return 0; err_out_unregister_bus: mdiobus_unregister(bp->mii_bus); err_out_free_mdio_irq: kfree(bp->mii_bus->irq); err_out_free_mdiobus: mdiobus_free(bp->mii_bus); err_out: return err; } EXPORT_SYMBOL_GPL(macb_mii_init); static void macb_update_stats(struct macb *bp) { u32 __iomem *reg = bp->regs + MACB_PFR; u32 *p = &bp->hw_stats.macb.rx_pause_frames; u32 *end = &bp->hw_stats.macb.tx_pause_frames + 1; WARN_ON((unsigned long)(end - p - 1) != (MACB_TPF - MACB_PFR) / 4); for(; p < end; p++, reg++) *p += __raw_readl(reg); } static int macb_halt_tx(struct macb *bp) { unsigned long halt_time, timeout; u32 status; macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(THALT)); timeout = jiffies + usecs_to_jiffies(MACB_HALT_TIMEOUT); do { halt_time = jiffies; status = macb_readl(bp, TSR); if (!(status & MACB_BIT(TGO))) return 0; usleep_range(10, 250); } while (time_before(halt_time, timeout)); return -ETIMEDOUT; } static void macb_tx_error_task(struct work_struct *work) { struct macb *bp = container_of(work, struct macb, tx_error_task); struct macb_tx_skb *tx_skb; struct sk_buff *skb; unsigned int tail; netdev_vdbg(bp->dev, "macb_tx_error_task: t = %u, h = %u\n", bp->tx_tail, bp->tx_head); /* Make sure nobody is trying to queue up new packets */ netif_stop_queue(bp->dev); /* * Stop transmission now * (in case we have just queued new packets) */ if (macb_halt_tx(bp)) /* Just complain for now, reinitializing TX path can be good */ netdev_err(bp->dev, "BUG: halt tx timed out\n"); /* No need for the lock here as nobody will interrupt us anymore */ /* * Treat frames in TX queue including the ones that caused the error. * Free transmit buffers in upper layer. */ for (tail = bp->tx_tail; tail != bp->tx_head; tail++) { struct macb_dma_desc *desc; u32 ctrl; desc = macb_tx_desc(bp, tail); ctrl = desc->ctrl; tx_skb = macb_tx_skb(bp, tail); skb = tx_skb->skb; if (ctrl & MACB_BIT(TX_USED)) { netdev_vdbg(bp->dev, "txerr skb %u (data %p) TX complete\n", macb_tx_ring_wrap(tail), skb->data); bp->stats.tx_packets++; bp->stats.tx_bytes += skb->len; } else { /* * "Buffers exhausted mid-frame" errors may only happen * if the driver is buggy, so complain loudly about those. * Statistics are updated by hardware. */ if (ctrl & MACB_BIT(TX_BUF_EXHAUSTED)) netdev_err(bp->dev, "BUG: TX buffers exhausted mid-frame\n"); desc->ctrl = ctrl | MACB_BIT(TX_USED); } dma_unmap_single(&bp->pdev->dev, tx_skb->mapping, skb->len, DMA_TO_DEVICE); tx_skb->skb = NULL; dev_kfree_skb(skb); } /* Make descriptor updates visible to hardware */ wmb(); /* Reinitialize the TX desc queue */ macb_writel(bp, TBQP, bp->tx_ring_dma); /* Make TX ring reflect state of hardware */ bp->tx_head = bp->tx_tail = 0; /* Now we are ready to start transmission again */ netif_wake_queue(bp->dev); /* Housework before enabling TX IRQ */ macb_writel(bp, TSR, macb_readl(bp, TSR)); macb_writel(bp, IER, MACB_TX_INT_FLAGS); } static void macb_tx_interrupt(struct macb *bp) { unsigned int tail; unsigned int head; u32 status; status = macb_readl(bp, TSR); macb_writel(bp, TSR, status); netdev_vdbg(bp->dev, "macb_tx_interrupt status = 0x%03lx\n", (unsigned long)status); head = bp->tx_head; for (tail = bp->tx_tail; tail != head; tail++) { struct macb_tx_skb *tx_skb; struct sk_buff *skb; struct macb_dma_desc *desc; u32 ctrl; desc = macb_tx_desc(bp, tail); /* Make hw descriptor updates visible to CPU */ rmb(); ctrl = desc->ctrl; if (!(ctrl & MACB_BIT(TX_USED))) break; tx_skb = macb_tx_skb(bp, tail); skb = tx_skb->skb; netdev_vdbg(bp->dev, "skb %u (data %p) TX complete\n", macb_tx_ring_wrap(tail), skb->data); dma_unmap_single(&bp->pdev->dev, tx_skb->mapping, skb->len, DMA_TO_DEVICE); bp->stats.tx_packets++; bp->stats.tx_bytes += skb->len; tx_skb->skb = NULL; dev_kfree_skb_irq(skb); } bp->tx_tail = tail; if (netif_queue_stopped(bp->dev) && macb_tx_ring_avail(bp) > MACB_TX_WAKEUP_THRESH) netif_wake_queue(bp->dev); } static int macb_rx_frame(struct macb *bp, unsigned int first_frag, unsigned int last_frag) { unsigned int len; unsigned int frag; unsigned int offset; struct sk_buff *skb; struct macb_dma_desc *desc; desc = macb_rx_desc(bp, last_frag); len = MACB_BFEXT(RX_FRMLEN, desc->ctrl); netdev_vdbg(bp->dev, "macb_rx_frame frags %u - %u (len %u)\n", macb_rx_ring_wrap(first_frag), macb_rx_ring_wrap(last_frag), len); /* * The ethernet header starts NET_IP_ALIGN bytes into the * first buffer. Since the header is 14 bytes, this makes the * payload word-aligned. * * Instead of calling skb_reserve(NET_IP_ALIGN), we just copy * the two padding bytes into the skb so that we avoid hitting * the slowpath in memcpy(), and pull them off afterwards. */ skb = netdev_alloc_skb(bp->dev, len + NET_IP_ALIGN); if (!skb) { bp->stats.rx_dropped++; for (frag = first_frag; ; frag++) { desc = macb_rx_desc(bp, frag); desc->addr &= ~MACB_BIT(RX_USED); if (frag == last_frag) break; } /* Make descriptor updates visible to hardware */ wmb(); return 1; } offset = 0; len += NET_IP_ALIGN; skb_checksum_none_assert(skb); skb_put(skb, len); for (frag = first_frag; ; frag++) { unsigned int frag_len = RX_BUFFER_SIZE; if (offset + frag_len > len) { BUG_ON(frag != last_frag); frag_len = len - offset; } skb_copy_to_linear_data_offset(skb, offset, macb_rx_buffer(bp, frag), frag_len); offset += RX_BUFFER_SIZE; desc = macb_rx_desc(bp, frag); desc->addr &= ~MACB_BIT(RX_USED); if (frag == last_frag) break; } /* Make descriptor updates visible to hardware */ wmb(); __skb_pull(skb, NET_IP_ALIGN); skb->protocol = eth_type_trans(skb, bp->dev); bp->stats.rx_packets++; bp->stats.rx_bytes += skb->len; netdev_vdbg(bp->dev, "received skb of length %u, csum: %08x\n", skb->len, skb->csum); netif_receive_skb(skb); return 0; } /* Mark DMA descriptors from begin up to and not including end as unused */ static void discard_partial_frame(struct macb *bp, unsigned int begin, unsigned int end) { unsigned int frag; for (frag = begin; frag != end; frag++) { struct macb_dma_desc *desc = macb_rx_desc(bp, frag); desc->addr &= ~MACB_BIT(RX_USED); } /* Make descriptor updates visible to hardware */ wmb(); /* * When this happens, the hardware stats registers for * whatever caused this is updated, so we don't have to record * anything. */ } static int macb_rx(struct macb *bp, int budget) { int received = 0; unsigned int tail; int first_frag = -1; for (tail = bp->rx_tail; budget > 0; tail++) { struct macb_dma_desc *desc = macb_rx_desc(bp, tail); u32 addr, ctrl; /* Make hw descriptor updates visible to CPU */ rmb(); addr = desc->addr; ctrl = desc->ctrl; if (!(addr & MACB_BIT(RX_USED))) break; if (ctrl & MACB_BIT(RX_SOF)) { if (first_frag != -1) discard_partial_frame(bp, first_frag, tail); first_frag = tail; } if (ctrl & MACB_BIT(RX_EOF)) { int dropped; BUG_ON(first_frag == -1); dropped = macb_rx_frame(bp, first_frag, tail); first_frag = -1; if (!dropped) { received++; budget--; } } } if (first_frag != -1) bp->rx_tail = first_frag; else bp->rx_tail = tail; return received; } static int macb_poll(struct napi_struct *napi, int budget) { struct macb *bp = container_of(napi, struct macb, napi); int work_done; u32 status; status = macb_readl(bp, RSR); macb_writel(bp, RSR, status); work_done = 0; netdev_vdbg(bp->dev, "poll: status = %08lx, budget = %d\n", (unsigned long)status, budget); work_done = macb_rx(bp, budget); if (work_done < budget) { napi_complete(napi); /* * We've done what we can to clean the buffers. Make sure we * get notified when new packets arrive. */ macb_writel(bp, IER, MACB_RX_INT_FLAGS); } /* TODO: Handle errors */ return work_done; } static irqreturn_t macb_interrupt(int irq, void *dev_id) { struct net_device *dev = dev_id; struct macb *bp = netdev_priv(dev); u32 status; status = macb_readl(bp, ISR); if (unlikely(!status)) return IRQ_NONE; spin_lock(&bp->lock); while (status) { /* close possible race with dev_close */ if (unlikely(!netif_running(dev))) { macb_writel(bp, IDR, -1); break; } netdev_vdbg(bp->dev, "isr = 0x%08lx\n", (unsigned long)status); if (status & MACB_RX_INT_FLAGS) { /* * There's no point taking any more interrupts * until we have processed the buffers. The * scheduling call may fail if the poll routine * is already scheduled, so disable interrupts * now. */ macb_writel(bp, IDR, MACB_RX_INT_FLAGS); if (napi_schedule_prep(&bp->napi)) { netdev_vdbg(bp->dev, "scheduling RX softirq\n"); __napi_schedule(&bp->napi); } } if (unlikely(status & (MACB_TX_ERR_FLAGS))) { macb_writel(bp, IDR, MACB_TX_INT_FLAGS); schedule_work(&bp->tx_error_task); break; } if (status & MACB_BIT(TCOMP)) macb_tx_interrupt(bp); /* * Link change detection isn't possible with RMII, so we'll * add that if/when we get our hands on a full-blown MII PHY. */ if (status & MACB_BIT(ISR_ROVR)) { /* We missed at least one packet */ if (macb_is_gem(bp)) bp->hw_stats.gem.rx_overruns++; else bp->hw_stats.macb.rx_overruns++; } if (status & MACB_BIT(HRESP)) { /* * TODO: Reset the hardware, and maybe move the * netdev_err to a lower-priority context as well * (work queue?) */ netdev_err(dev, "DMA bus error: HRESP not OK\n"); } status = macb_readl(bp, ISR); } spin_unlock(&bp->lock); return IRQ_HANDLED; } #ifdef CONFIG_NET_POLL_CONTROLLER /* * Polling receive - used by netconsole and other diagnostic tools * to allow network i/o with interrupts disabled. */ static void macb_poll_controller(struct net_device *dev) { unsigned long flags; local_irq_save(flags); macb_interrupt(dev->irq, dev); local_irq_restore(flags); } #endif static int macb_start_xmit(struct sk_buff *skb, struct net_device *dev) { struct macb *bp = netdev_priv(dev); dma_addr_t mapping; unsigned int len, entry; struct macb_dma_desc *desc; struct macb_tx_skb *tx_skb; u32 ctrl; unsigned long flags; #if defined(DEBUG) && defined(VERBOSE_DEBUG) netdev_vdbg(bp->dev, "start_xmit: len %u head %p data %p tail %p end %p\n", skb->len, skb->head, skb->data, skb_tail_pointer(skb), skb_end_pointer(skb)); print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_OFFSET, 16, 1, skb->data, 16, true); #endif len = skb->len; spin_lock_irqsave(&bp->lock, flags); /* This is a hard error, log it. */ if (macb_tx_ring_avail(bp) < 1) { netif_stop_queue(dev); spin_unlock_irqrestore(&bp->lock, flags); netdev_err(bp->dev, "BUG! Tx Ring full when queue awake!\n"); netdev_dbg(bp->dev, "tx_head = %u, tx_tail = %u\n", bp->tx_head, bp->tx_tail); return NETDEV_TX_BUSY; } entry = macb_tx_ring_wrap(bp->tx_head); bp->tx_head++; netdev_vdbg(bp->dev, "Allocated ring entry %u\n", entry); mapping = dma_map_single(&bp->pdev->dev, skb->data, len, DMA_TO_DEVICE); tx_skb = &bp->tx_skb[entry]; tx_skb->skb = skb; tx_skb->mapping = mapping; netdev_vdbg(bp->dev, "Mapped skb data %p to DMA addr %08lx\n", skb->data, (unsigned long)mapping); ctrl = MACB_BF(TX_FRMLEN, len); ctrl |= MACB_BIT(TX_LAST); if (entry == (TX_RING_SIZE - 1)) ctrl |= MACB_BIT(TX_WRAP); desc = &bp->tx_ring[entry]; desc->addr = mapping; desc->ctrl = ctrl; /* Make newly initialized descriptor visible to hardware */ wmb(); skb_tx_timestamp(skb); macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TSTART)); if (macb_tx_ring_avail(bp) < 1) netif_stop_queue(dev); spin_unlock_irqrestore(&bp->lock, flags); return NETDEV_TX_OK; } static void macb_free_consistent(struct macb *bp) { if (bp->tx_skb) { kfree(bp->tx_skb); bp->tx_skb = NULL; } if (bp->rx_ring) { dma_free_coherent(&bp->pdev->dev, RX_RING_BYTES, bp->rx_ring, bp->rx_ring_dma); bp->rx_ring = NULL; } if (bp->tx_ring) { dma_free_coherent(&bp->pdev->dev, TX_RING_BYTES, bp->tx_ring, bp->tx_ring_dma); bp->tx_ring = NULL; } if (bp->rx_buffers) { dma_free_coherent(&bp->pdev->dev, RX_RING_SIZE * RX_BUFFER_SIZE, bp->rx_buffers, bp->rx_buffers_dma); bp->rx_buffers = NULL; } } static int macb_alloc_consistent(struct macb *bp) { int size; size = TX_RING_SIZE * sizeof(struct macb_tx_skb); bp->tx_skb = kmalloc(size, GFP_KERNEL); if (!bp->tx_skb) goto out_err; size = RX_RING_BYTES; bp->rx_ring = dma_alloc_coherent(&bp->pdev->dev, size, &bp->rx_ring_dma, GFP_KERNEL); if (!bp->rx_ring) goto out_err; netdev_dbg(bp->dev, "Allocated RX ring of %d bytes at %08lx (mapped %p)\n", size, (unsigned long)bp->rx_ring_dma, bp->rx_ring); size = TX_RING_BYTES; bp->tx_ring = dma_alloc_coherent(&bp->pdev->dev, size, &bp->tx_ring_dma, GFP_KERNEL); if (!bp->tx_ring) goto out_err; netdev_dbg(bp->dev, "Allocated TX ring of %d bytes at %08lx (mapped %p)\n", size, (unsigned long)bp->tx_ring_dma, bp->tx_ring); size = RX_RING_SIZE * RX_BUFFER_SIZE; bp->rx_buffers = dma_alloc_coherent(&bp->pdev->dev, size, &bp->rx_buffers_dma, GFP_KERNEL); if (!bp->rx_buffers) goto out_err; netdev_dbg(bp->dev, "Allocated RX buffers of %d bytes at %08lx (mapped %p)\n", size, (unsigned long)bp->rx_buffers_dma, bp->rx_buffers); return 0; out_err: macb_free_consistent(bp); return -ENOMEM; } static void macb_init_rings(struct macb *bp) { int i; dma_addr_t addr; addr = bp->rx_buffers_dma; for (i = 0; i < RX_RING_SIZE; i++) { bp->rx_ring[i].addr = addr; bp->rx_ring[i].ctrl = 0; addr += RX_BUFFER_SIZE; } bp->rx_ring[RX_RING_SIZE - 1].addr |= MACB_BIT(RX_WRAP); for (i = 0; i < TX_RING_SIZE; i++) { bp->tx_ring[i].addr = 0; bp->tx_ring[i].ctrl = MACB_BIT(TX_USED); } bp->tx_ring[TX_RING_SIZE - 1].ctrl |= MACB_BIT(TX_WRAP); bp->rx_tail = bp->tx_head = bp->tx_tail = 0; } static void macb_reset_hw(struct macb *bp) { /* * Disable RX and TX (XXX: Should we halt the transmission * more gracefully?) */ macb_writel(bp, NCR, 0); /* Clear the stats registers (XXX: Update stats first?) */ macb_writel(bp, NCR, MACB_BIT(CLRSTAT)); /* Clear all status flags */ macb_writel(bp, TSR, -1); macb_writel(bp, RSR, -1); /* Disable all interrupts */ macb_writel(bp, IDR, -1); macb_readl(bp, ISR); } static u32 gem_mdc_clk_div(struct macb *bp) { u32 config; unsigned long pclk_hz = clk_get_rate(bp->pclk); if (pclk_hz <= 20000000) config = GEM_BF(CLK, GEM_CLK_DIV8); else if (pclk_hz <= 40000000) config = GEM_BF(CLK, GEM_CLK_DIV16); else if (pclk_hz <= 80000000) config = GEM_BF(CLK, GEM_CLK_DIV32); else if (pclk_hz <= 120000000) config = GEM_BF(CLK, GEM_CLK_DIV48); else if (pclk_hz <= 160000000) config = GEM_BF(CLK, GEM_CLK_DIV64); else config = GEM_BF(CLK, GEM_CLK_DIV96); return config; } static u32 macb_mdc_clk_div(struct macb *bp) { u32 config; unsigned long pclk_hz; if (macb_is_gem(bp)) return gem_mdc_clk_div(bp); pclk_hz = clk_get_rate(bp->pclk); if (pclk_hz <= 20000000) config = MACB_BF(CLK, MACB_CLK_DIV8); else if (pclk_hz <= 40000000) config = MACB_BF(CLK, MACB_CLK_DIV16); else if (pclk_hz <= 80000000) config = MACB_BF(CLK, MACB_CLK_DIV32); else config = MACB_BF(CLK, MACB_CLK_DIV64); return config; } /* * Get the DMA bus width field of the network configuration register that we * should program. We find the width from decoding the design configuration * register to find the maximum supported data bus width. */ static u32 macb_dbw(struct macb *bp) { if (!macb_is_gem(bp)) return 0; switch (GEM_BFEXT(DBWDEF, gem_readl(bp, DCFG1))) { case 4: return GEM_BF(DBW, GEM_DBW128); case 2: return GEM_BF(DBW, GEM_DBW64); case 1: default: return GEM_BF(DBW, GEM_DBW32); } } /* * Configure the receive DMA engine to use the correct receive buffer size. * This is a configurable parameter for GEM. */ static void macb_configure_dma(struct macb *bp) { u32 dmacfg; if (macb_is_gem(bp)) { dmacfg = gem_readl(bp, DMACFG) & ~GEM_BF(RXBS, -1L); dmacfg |= GEM_BF(RXBS, RX_BUFFER_SIZE / 64); gem_writel(bp, DMACFG, dmacfg); } } static void macb_init_hw(struct macb *bp) { u32 config; macb_reset_hw(bp); __macb_set_hwaddr(bp); config = macb_mdc_clk_div(bp); config |= MACB_BF(RBOF, NET_IP_ALIGN); /* Make eth data aligned */ config |= MACB_BIT(PAE); /* PAuse Enable */ config |= MACB_BIT(DRFCS); /* Discard Rx FCS */ config |= MACB_BIT(BIG); /* Receive oversized frames */ if (bp->dev->flags & IFF_PROMISC) config |= MACB_BIT(CAF); /* Copy All Frames */ if (!(bp->dev->flags & IFF_BROADCAST)) config |= MACB_BIT(NBC); /* No BroadCast */ config |= macb_dbw(bp); macb_writel(bp, NCFGR, config); macb_configure_dma(bp); /* Initialize TX and RX buffers */ macb_writel(bp, RBQP, bp->rx_ring_dma); macb_writel(bp, TBQP, bp->tx_ring_dma); /* Enable TX and RX */ macb_writel(bp, NCR, MACB_BIT(RE) | MACB_BIT(TE) | MACB_BIT(MPE)); /* Enable interrupts */ macb_writel(bp, IER, (MACB_RX_INT_FLAGS | MACB_TX_INT_FLAGS | MACB_BIT(HRESP))); } /* * The hash address register is 64 bits long and takes up two * locations in the memory map. The least significant bits are stored * in EMAC_HSL and the most significant bits in EMAC_HSH. * * The unicast hash enable and the multicast hash enable bits in the * network configuration register enable the reception of hash matched * frames. The destination address is reduced to a 6 bit index into * the 64 bit hash register using the following hash function. The * hash function is an exclusive or of every sixth bit of the * destination address. * * hi[5] = da[5] ^ da[11] ^ da[17] ^ da[23] ^ da[29] ^ da[35] ^ da[41] ^ da[47] * hi[4] = da[4] ^ da[10] ^ da[16] ^ da[22] ^ da[28] ^ da[34] ^ da[40] ^ da[46] * hi[3] = da[3] ^ da[09] ^ da[15] ^ da[21] ^ da[27] ^ da[33] ^ da[39] ^ da[45] * hi[2] = da[2] ^ da[08] ^ da[14] ^ da[20] ^ da[26] ^ da[32] ^ da[38] ^ da[44] * hi[1] = da[1] ^ da[07] ^ da[13] ^ da[19] ^ da[25] ^ da[31] ^ da[37] ^ da[43] * hi[0] = da[0] ^ da[06] ^ da[12] ^ da[18] ^ da[24] ^ da[30] ^ da[36] ^ da[42] * * da[0] represents the least significant bit of the first byte * received, that is, the multicast/unicast indicator, and da[47] * represents the most significant bit of the last byte received. If * the hash index, hi[n], points to a bit that is set in the hash * register then the frame will be matched according to whether the * frame is multicast or unicast. A multicast match will be signalled * if the multicast hash enable bit is set, da[0] is 1 and the hash * index points to a bit set in the hash register. A unicast match * will be signalled if the unicast hash enable bit is set, da[0] is 0 * and the hash index points to a bit set in the hash register. To * receive all multicast frames, the hash register should be set with * all ones and the multicast hash enable bit should be set in the * network configuration register. */ static inline int hash_bit_value(int bitnr, __u8 *addr) { if (addr[bitnr / 8] & (1 << (bitnr % 8))) return 1; return 0; } /* * Return the hash index value for the specified address. */ static int hash_get_index(__u8 *addr) { int i, j, bitval; int hash_index = 0; for (j = 0; j < 6; j++) { for (i = 0, bitval = 0; i < 8; i++) bitval ^= hash_bit_value(i*6 + j, addr); hash_index |= (bitval << j); } return hash_index; } /* * Add multicast addresses to the internal multicast-hash table. */ static void macb_sethashtable(struct net_device *dev) { struct netdev_hw_addr *ha; unsigned long mc_filter[2]; unsigned int bitnr; struct macb *bp = netdev_priv(dev); mc_filter[0] = mc_filter[1] = 0; netdev_for_each_mc_addr(ha, dev) { bitnr = hash_get_index(ha->addr); mc_filter[bitnr >> 5] |= 1 << (bitnr & 31); } macb_or_gem_writel(bp, HRB, mc_filter[0]); macb_or_gem_writel(bp, HRT, mc_filter[1]); } /* * Enable/Disable promiscuous and multicast modes. */ void macb_set_rx_mode(struct net_device *dev) { unsigned long cfg; struct macb *bp = netdev_priv(dev); cfg = macb_readl(bp, NCFGR); if (dev->flags & IFF_PROMISC) /* Enable promiscuous mode */ cfg |= MACB_BIT(CAF); else if (dev->flags & (~IFF_PROMISC)) /* Disable promiscuous mode */ cfg &= ~MACB_BIT(CAF); if (dev->flags & IFF_ALLMULTI) { /* Enable all multicast mode */ macb_or_gem_writel(bp, HRB, -1); macb_or_gem_writel(bp, HRT, -1); cfg |= MACB_BIT(NCFGR_MTI); } else if (!netdev_mc_empty(dev)) { /* Enable specific multicasts */ macb_sethashtable(dev); cfg |= MACB_BIT(NCFGR_MTI); } else if (dev->flags & (~IFF_ALLMULTI)) { /* Disable all multicast mode */ macb_or_gem_writel(bp, HRB, 0); macb_or_gem_writel(bp, HRT, 0); cfg &= ~MACB_BIT(NCFGR_MTI); } macb_writel(bp, NCFGR, cfg); } EXPORT_SYMBOL_GPL(macb_set_rx_mode); static int macb_open(struct net_device *dev) { struct macb *bp = netdev_priv(dev); int err; netdev_dbg(bp->dev, "open\n"); /* carrier starts down */ netif_carrier_off(dev); /* if the phy is not yet register, retry later*/ if (!bp->phy_dev) return -EAGAIN; if (!is_valid_ether_addr(dev->dev_addr)) return -EADDRNOTAVAIL; err = macb_alloc_consistent(bp); if (err) { netdev_err(dev, "Unable to allocate DMA memory (error %d)\n", err); return err; } napi_enable(&bp->napi); macb_init_rings(bp); macb_init_hw(bp); /* schedule a link state check */ phy_start(bp->phy_dev); netif_start_queue(dev); return 0; } static int macb_close(struct net_device *dev) { struct macb *bp = netdev_priv(dev); unsigned long flags; netif_stop_queue(dev); napi_disable(&bp->napi); if (bp->phy_dev) phy_stop(bp->phy_dev); spin_lock_irqsave(&bp->lock, flags); macb_reset_hw(bp); netif_carrier_off(dev); spin_unlock_irqrestore(&bp->lock, flags); macb_free_consistent(bp); return 0; } static void gem_update_stats(struct macb *bp) { u32 __iomem *reg = bp->regs + GEM_OTX; u32 *p = &bp->hw_stats.gem.tx_octets_31_0; u32 *end = &bp->hw_stats.gem.rx_udp_checksum_errors + 1; for (; p < end; p++, reg++) *p += __raw_readl(reg); } static struct net_device_stats *gem_get_stats(struct macb *bp) { struct gem_stats *hwstat = &bp->hw_stats.gem; struct net_device_stats *nstat = &bp->stats; gem_update_stats(bp); nstat->rx_errors = (hwstat->rx_frame_check_sequence_errors + hwstat->rx_alignment_errors + hwstat->rx_resource_errors + hwstat->rx_overruns + hwstat->rx_oversize_frames + hwstat->rx_jabbers + hwstat->rx_undersized_frames + hwstat->rx_length_field_frame_errors); nstat->tx_errors = (hwstat->tx_late_collisions + hwstat->tx_excessive_collisions + hwstat->tx_underrun + hwstat->tx_carrier_sense_errors); nstat->multicast = hwstat->rx_multicast_frames; nstat->collisions = (hwstat->tx_single_collision_frames + hwstat->tx_multiple_collision_frames + hwstat->tx_excessive_collisions); nstat->rx_length_errors = (hwstat->rx_oversize_frames + hwstat->rx_jabbers + hwstat->rx_undersized_frames + hwstat->rx_length_field_frame_errors); nstat->rx_over_errors = hwstat->rx_resource_errors; nstat->rx_crc_errors = hwstat->rx_frame_check_sequence_errors; nstat->rx_frame_errors = hwstat->rx_alignment_errors; nstat->rx_fifo_errors = hwstat->rx_overruns; nstat->tx_aborted_errors = hwstat->tx_excessive_collisions; nstat->tx_carrier_errors = hwstat->tx_carrier_sense_errors; nstat->tx_fifo_errors = hwstat->tx_underrun; return nstat; } static struct net_device_stats *macb_get_stats(struct net_device *dev) { struct macb *bp = netdev_priv(dev); struct net_device_stats *nstat = &bp->stats; struct macb_stats *hwstat = &bp->hw_stats.macb; if (macb_is_gem(bp)) return gem_get_stats(bp); /* read stats from hardware */ macb_update_stats(bp); /* Convert HW stats into netdevice stats */ nstat->rx_errors = (hwstat->rx_fcs_errors + hwstat->rx_align_errors + hwstat->rx_resource_errors + hwstat->rx_overruns + hwstat->rx_oversize_pkts + hwstat->rx_jabbers + hwstat->rx_undersize_pkts + hwstat->sqe_test_errors + hwstat->rx_length_mismatch); nstat->tx_errors = (hwstat->tx_late_cols + hwstat->tx_excessive_cols + hwstat->tx_underruns + hwstat->tx_carrier_errors); nstat->collisions = (hwstat->tx_single_cols + hwstat->tx_multiple_cols + hwstat->tx_excessive_cols); nstat->rx_length_errors = (hwstat->rx_oversize_pkts + hwstat->rx_jabbers + hwstat->rx_undersize_pkts + hwstat->rx_length_mismatch); nstat->rx_over_errors = hwstat->rx_resource_errors + hwstat->rx_overruns; nstat->rx_crc_errors = hwstat->rx_fcs_errors; nstat->rx_frame_errors = hwstat->rx_align_errors; nstat->rx_fifo_errors = hwstat->rx_overruns; /* XXX: What does "missed" mean? */ nstat->tx_aborted_errors = hwstat->tx_excessive_cols; nstat->tx_carrier_errors = hwstat->tx_carrier_errors; nstat->tx_fifo_errors = hwstat->tx_underruns; /* Don't know about heartbeat or window errors... */ return nstat; } static int macb_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) { struct macb *bp = netdev_priv(dev); struct phy_device *phydev = bp->phy_dev; if (!phydev) return -ENODEV; return phy_ethtool_gset(phydev, cmd); } static int macb_set_settings(struct net_device *dev, struct ethtool_cmd *cmd) { struct macb *bp = netdev_priv(dev); struct phy_device *phydev = bp->phy_dev; if (!phydev) return -ENODEV; return phy_ethtool_sset(phydev, cmd); } static int macb_get_regs_len(struct net_device *netdev) { return MACB_GREGS_NBR * sizeof(u32); } static void macb_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *p) { struct macb *bp = netdev_priv(dev); unsigned int tail, head; u32 *regs_buff = p; regs->version = (macb_readl(bp, MID) & ((1 << MACB_REV_SIZE) - 1)) | MACB_GREGS_VERSION; tail = macb_tx_ring_wrap(bp->tx_tail); head = macb_tx_ring_wrap(bp->tx_head); regs_buff[0] = macb_readl(bp, NCR); regs_buff[1] = macb_or_gem_readl(bp, NCFGR); regs_buff[2] = macb_readl(bp, NSR); regs_buff[3] = macb_readl(bp, TSR); regs_buff[4] = macb_readl(bp, RBQP); regs_buff[5] = macb_readl(bp, TBQP); regs_buff[6] = macb_readl(bp, RSR); regs_buff[7] = macb_readl(bp, IMR); regs_buff[8] = tail; regs_buff[9] = head; regs_buff[10] = macb_tx_dma(bp, tail); regs_buff[11] = macb_tx_dma(bp, head); if (macb_is_gem(bp)) { regs_buff[12] = gem_readl(bp, USRIO); regs_buff[13] = gem_readl(bp, DMACFG); } } const struct ethtool_ops macb_ethtool_ops = { .get_settings = macb_get_settings, .set_settings = macb_set_settings, .get_regs_len = macb_get_regs_len, .get_regs = macb_get_regs, .get_link = ethtool_op_get_link, .get_ts_info = ethtool_op_get_ts_info, }; EXPORT_SYMBOL_GPL(macb_ethtool_ops); int macb_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) { struct macb *bp = netdev_priv(dev); struct phy_device *phydev = bp->phy_dev; if (!netif_running(dev)) return -EINVAL; if (!phydev) return -ENODEV; return phy_mii_ioctl(phydev, rq, cmd); } EXPORT_SYMBOL_GPL(macb_ioctl); static const struct net_device_ops macb_netdev_ops = { .ndo_open = macb_open, .ndo_stop = macb_close, .ndo_start_xmit = macb_start_xmit, .ndo_set_rx_mode = macb_set_rx_mode, .ndo_get_stats = macb_get_stats, .ndo_do_ioctl = macb_ioctl, .ndo_validate_addr = eth_validate_addr, .ndo_change_mtu = eth_change_mtu, .ndo_set_mac_address = eth_mac_addr, #ifdef CONFIG_NET_POLL_CONTROLLER .ndo_poll_controller = macb_poll_controller, #endif }; #if defined(CONFIG_OF) static const struct of_device_id macb_dt_ids[] = { { .compatible = "cdns,at32ap7000-macb" }, { .compatible = "cdns,at91sam9260-macb" }, { .compatible = "cdns,macb" }, { .compatible = "cdns,pc302-gem" }, { .compatible = "cdns,gem" }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, macb_dt_ids); static int __devinit macb_get_phy_mode_dt(struct platform_device *pdev) { struct device_node *np = pdev->dev.of_node; if (np) return of_get_phy_mode(np); return -ENODEV; } static int __devinit macb_get_hwaddr_dt(struct macb *bp) { struct device_node *np = bp->pdev->dev.of_node; if (np) { const char *mac = of_get_mac_address(np); if (mac) { memcpy(bp->dev->dev_addr, mac, ETH_ALEN); return 0; } } return -ENODEV; } #else static int __devinit macb_get_phy_mode_dt(struct platform_device *pdev) { return -ENODEV; } static int __devinit macb_get_hwaddr_dt(struct macb *bp) { return -ENODEV; } #endif static int __init macb_probe(struct platform_device *pdev) { struct macb_platform_data *pdata; struct resource *regs; struct net_device *dev; struct macb *bp; struct phy_device *phydev; u32 config; int err = -ENXIO; regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!regs) { dev_err(&pdev->dev, "no mmio resource defined\n"); goto err_out; } err = -ENOMEM; dev = alloc_etherdev(sizeof(*bp)); if (!dev) goto err_out; SET_NETDEV_DEV(dev, &pdev->dev); /* TODO: Actually, we have some interesting features... */ dev->features |= 0; bp = netdev_priv(dev); bp->pdev = pdev; bp->dev = dev; spin_lock_init(&bp->lock); INIT_WORK(&bp->tx_error_task, macb_tx_error_task); bp->pclk = clk_get(&pdev->dev, "pclk"); if (IS_ERR(bp->pclk)) { dev_err(&pdev->dev, "failed to get macb_clk\n"); goto err_out_free_dev; } clk_enable(bp->pclk); bp->hclk = clk_get(&pdev->dev, "hclk"); if (IS_ERR(bp->hclk)) { dev_err(&pdev->dev, "failed to get hclk\n"); goto err_out_put_pclk; } clk_enable(bp->hclk); bp->regs = ioremap(regs->start, resource_size(regs)); if (!bp->regs) { dev_err(&pdev->dev, "failed to map registers, aborting.\n"); err = -ENOMEM; goto err_out_disable_clocks; } dev->irq = platform_get_irq(pdev, 0); err = request_irq(dev->irq, macb_interrupt, 0, dev->name, dev); if (err) { dev_err(&pdev->dev, "Unable to request IRQ %d (error %d)\n", dev->irq, err); goto err_out_iounmap; } dev->netdev_ops = &macb_netdev_ops; netif_napi_add(dev, &bp->napi, macb_poll, 64); dev->ethtool_ops = &macb_ethtool_ops; dev->base_addr = regs->start; /* Set MII management clock divider */ config = macb_mdc_clk_div(bp); config |= macb_dbw(bp); macb_writel(bp, NCFGR, config); err = macb_get_hwaddr_dt(bp); if (err < 0) macb_get_hwaddr(bp); err = macb_get_phy_mode_dt(pdev); if (err < 0) { pdata = pdev->dev.platform_data; if (pdata && pdata->is_rmii) bp->phy_interface = PHY_INTERFACE_MODE_RMII; else bp->phy_interface = PHY_INTERFACE_MODE_MII; } else { bp->phy_interface = err; } if (bp->phy_interface == PHY_INTERFACE_MODE_RGMII) macb_or_gem_writel(bp, USRIO, GEM_BIT(RGMII)); else if (bp->phy_interface == PHY_INTERFACE_MODE_RMII) #if defined(CONFIG_ARCH_AT91) macb_or_gem_writel(bp, USRIO, (MACB_BIT(RMII) | MACB_BIT(CLKEN))); #else macb_or_gem_writel(bp, USRIO, 0); #endif else #if defined(CONFIG_ARCH_AT91) macb_or_gem_writel(bp, USRIO, MACB_BIT(CLKEN)); #else macb_or_gem_writel(bp, USRIO, MACB_BIT(MII)); #endif err = register_netdev(dev); if (err) { dev_err(&pdev->dev, "Cannot register net device, aborting.\n"); goto err_out_free_irq; } if (macb_mii_init(bp) != 0) { goto err_out_unregister_netdev; } platform_set_drvdata(pdev, dev); netif_carrier_off(dev); netdev_info(dev, "Cadence %s at 0x%08lx irq %d (%pM)\n", macb_is_gem(bp) ? "GEM" : "MACB", dev->base_addr, dev->irq, dev->dev_addr); phydev = bp->phy_dev; netdev_info(dev, "attached PHY driver [%s] (mii_bus:phy_addr=%s, irq=%d)\n", phydev->drv->name, dev_name(&phydev->dev), phydev->irq); return 0; err_out_unregister_netdev: unregister_netdev(dev); err_out_free_irq: free_irq(dev->irq, dev); err_out_iounmap: iounmap(bp->regs); err_out_disable_clocks: clk_disable(bp->hclk); clk_put(bp->hclk); clk_disable(bp->pclk); err_out_put_pclk: clk_put(bp->pclk); err_out_free_dev: free_netdev(dev); err_out: platform_set_drvdata(pdev, NULL); return err; } static int __exit macb_remove(struct platform_device *pdev) { struct net_device *dev; struct macb *bp; dev = platform_get_drvdata(pdev); if (dev) { bp = netdev_priv(dev); if (bp->phy_dev) phy_disconnect(bp->phy_dev); mdiobus_unregister(bp->mii_bus); kfree(bp->mii_bus->irq); mdiobus_free(bp->mii_bus); unregister_netdev(dev); free_irq(dev->irq, dev); iounmap(bp->regs); clk_disable(bp->hclk); clk_put(bp->hclk); clk_disable(bp->pclk); clk_put(bp->pclk); free_netdev(dev); platform_set_drvdata(pdev, NULL); } return 0; } #ifdef CONFIG_PM static int macb_suspend(struct platform_device *pdev, pm_message_t state) { struct net_device *netdev = platform_get_drvdata(pdev); struct macb *bp = netdev_priv(netdev); netif_carrier_off(netdev); netif_device_detach(netdev); clk_disable(bp->hclk); clk_disable(bp->pclk); return 0; } static int macb_resume(struct platform_device *pdev) { struct net_device *netdev = platform_get_drvdata(pdev); struct macb *bp = netdev_priv(netdev); clk_enable(bp->pclk); clk_enable(bp->hclk); netif_device_attach(netdev); return 0; } #else #define macb_suspend NULL #define macb_resume NULL #endif static struct platform_driver macb_driver = { .remove = __exit_p(macb_remove), .suspend = macb_suspend, .resume = macb_resume, .driver = { .name = "macb", .owner = THIS_MODULE, .of_match_table = of_match_ptr(macb_dt_ids), }, }; static int __init macb_init(void) { return platform_driver_probe(&macb_driver, macb_probe); } static void __exit macb_exit(void) { platform_driver_unregister(&macb_driver); } module_init(macb_init); module_exit(macb_exit); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Cadence MACB/GEM Ethernet driver"); MODULE_AUTHOR("Haavard Skinnemoen (Atmel)"); MODULE_ALIAS("platform:macb");