| /* |
| * 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 <linux/clk.h> |
| #include <linux/module.h> |
| #include <linux/moduleparam.h> |
| #include <linux/kernel.h> |
| #include <linux/types.h> |
| #include <linux/circ_buf.h> |
| #include <linux/slab.h> |
| #include <linux/init.h> |
| #include <linux/io.h> |
| #include <linux/gpio.h> |
| #include <linux/gpio/consumer.h> |
| #include <linux/interrupt.h> |
| #include <linux/netdevice.h> |
| #include <linux/etherdevice.h> |
| #include <linux/dma-mapping.h> |
| #include <linux/platform_data/macb.h> |
| #include <linux/platform_device.h> |
| #include <linux/phy.h> |
| #include <linux/of.h> |
| #include <linux/of_device.h> |
| #include <linux/of_gpio.h> |
| #include <linux/of_mdio.h> |
| #include <linux/of_net.h> |
| |
| #include "macb.h" |
| |
| #define MACB_RX_BUFFER_SIZE 128 |
| #define RX_BUFFER_MULTIPLE 64 /* bytes */ |
| #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) |
| |
| /* level of occupied TX descriptors under which we wake up TX process */ |
| #define MACB_TX_WAKEUP_THRESH (3 * 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)) |
| |
| #define MACB_MAX_TX_LEN ((unsigned int)((1 << MACB_TX_FRMLEN_SIZE) - 1)) |
| #define GEM_MAX_TX_LEN ((unsigned int)((1 << GEM_TX_FRMLEN_SIZE) - 1)) |
| |
| #define GEM_MTU_MIN_SIZE 68 |
| |
| #define MACB_WOL_HAS_MAGIC_PACKET (0x1 << 0) |
| #define MACB_WOL_ENABLED (0x1 << 1) |
| |
| /* 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 struct macb_dma_desc *macb_tx_desc(struct macb_queue *queue, |
| unsigned int index) |
| { |
| return &queue->tx_ring[macb_tx_ring_wrap(index)]; |
| } |
| |
| static struct macb_tx_skb *macb_tx_skb(struct macb_queue *queue, |
| unsigned int index) |
| { |
| return &queue->tx_skb[macb_tx_ring_wrap(index)]; |
| } |
| |
| static dma_addr_t macb_tx_dma(struct macb_queue *queue, unsigned int index) |
| { |
| dma_addr_t offset; |
| |
| offset = macb_tx_ring_wrap(index) * sizeof(struct macb_dma_desc); |
| |
| return queue->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 + bp->rx_buffer_size * macb_rx_ring_wrap(index); |
| } |
| |
| /* I/O accessors */ |
| static u32 hw_readl_native(struct macb *bp, int offset) |
| { |
| return __raw_readl(bp->regs + offset); |
| } |
| |
| static void hw_writel_native(struct macb *bp, int offset, u32 value) |
| { |
| __raw_writel(value, bp->regs + offset); |
| } |
| |
| static u32 hw_readl(struct macb *bp, int offset) |
| { |
| return readl_relaxed(bp->regs + offset); |
| } |
| |
| static void hw_writel(struct macb *bp, int offset, u32 value) |
| { |
| writel_relaxed(value, bp->regs + offset); |
| } |
| |
| /* Find the CPU endianness by using the loopback bit of NCR register. When the |
| * CPU is in big endian we need to program swaped mode for management |
| * descriptor access. |
| */ |
| static bool hw_is_native_io(void __iomem *addr) |
| { |
| u32 value = MACB_BIT(LLB); |
| |
| __raw_writel(value, addr + MACB_NCR); |
| value = __raw_readl(addr + MACB_NCR); |
| |
| /* Write 0 back to disable everything */ |
| __raw_writel(0, addr + MACB_NCR); |
| |
| return value == MACB_BIT(LLB); |
| } |
| |
| static bool hw_is_gem(void __iomem *addr, bool native_io) |
| { |
| u32 id; |
| |
| if (native_io) |
| id = __raw_readl(addr + MACB_MID); |
| else |
| id = readl_relaxed(addr + MACB_MID); |
| |
| return MACB_BFEXT(IDNUM, id) >= 0x2; |
| } |
| |
| 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); |
| |
| /* Clear unused address register sets */ |
| macb_or_gem_writel(bp, SA2B, 0); |
| macb_or_gem_writel(bp, SA2T, 0); |
| macb_or_gem_writel(bp, SA3B, 0); |
| macb_or_gem_writel(bp, SA3T, 0); |
| macb_or_gem_writel(bp, SA4B, 0); |
| macb_or_gem_writel(bp, SA4T, 0); |
| } |
| |
| static void macb_get_hwaddr(struct macb *bp) |
| { |
| struct macb_platform_data *pdata; |
| u32 bottom; |
| u16 top; |
| u8 addr[6]; |
| int i; |
| |
| pdata = dev_get_platdata(&bp->pdev->dev); |
| |
| /* Check all 4 address register for valid address */ |
| for (i = 0; i < 4; i++) { |
| bottom = macb_or_gem_readl(bp, SA1B + i * 8); |
| top = macb_or_gem_readl(bp, SA1T + i * 8); |
| |
| if (pdata && pdata->rev_eth_addr) { |
| addr[5] = bottom & 0xff; |
| addr[4] = (bottom >> 8) & 0xff; |
| addr[3] = (bottom >> 16) & 0xff; |
| addr[2] = (bottom >> 24) & 0xff; |
| addr[1] = top & 0xff; |
| addr[0] = (top & 0xff00) >> 8; |
| } else { |
| 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)); |
| return; |
| } |
| } |
| |
| dev_info(&bp->pdev->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; |
| } |
| |
| /** |
| * macb_set_tx_clk() - Set a clock to a new frequency |
| * @clk Pointer to the clock to change |
| * @rate New frequency in Hz |
| * @dev Pointer to the struct net_device |
| */ |
| static void macb_set_tx_clk(struct clk *clk, int speed, struct net_device *dev) |
| { |
| long ferr, rate, rate_rounded; |
| |
| if (!clk) |
| return; |
| |
| switch (speed) { |
| case SPEED_10: |
| rate = 2500000; |
| break; |
| case SPEED_100: |
| rate = 25000000; |
| break; |
| case SPEED_1000: |
| rate = 125000000; |
| break; |
| default: |
| return; |
| } |
| |
| rate_rounded = clk_round_rate(clk, rate); |
| if (rate_rounded < 0) |
| return; |
| |
| /* RGMII allows 50 ppm frequency error. Test and warn if this limit |
| * is not satisfied. |
| */ |
| ferr = abs(rate_rounded - rate); |
| ferr = DIV_ROUND_UP(ferr, rate / 100000); |
| if (ferr > 5) |
| netdev_warn(dev, "unable to generate target frequency: %ld Hz\n", |
| rate); |
| |
| if (clk_set_rate(clk, rate_rounded)) |
| netdev_err(dev, "adjusting tx_clk failed.\n"); |
| } |
| |
| 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 && |
| bp->caps & MACB_CAPS_GIGABIT_MODE_AVAILABLE) |
| 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) { |
| /* Update the TX clock rate if and only if the link is |
| * up and there has been a link change. |
| */ |
| macb_set_tx_clk(bp->tx_clk, phydev->speed, dev); |
| |
| 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 macb_platform_data *pdata; |
| struct phy_device *phydev; |
| int phy_irq; |
| int ret; |
| |
| phydev = phy_find_first(bp->mii_bus); |
| if (!phydev) { |
| netdev_err(dev, "no PHY found\n"); |
| return -ENXIO; |
| } |
| |
| pdata = dev_get_platdata(&bp->pdev->dev); |
| if (pdata && gpio_is_valid(pdata->phy_irq_pin)) { |
| ret = devm_gpio_request(&bp->pdev->dev, pdata->phy_irq_pin, |
| "phy int"); |
| if (!ret) { |
| phy_irq = gpio_to_irq(pdata->phy_irq_pin); |
| phydev->irq = (phy_irq < 0) ? PHY_POLL : phy_irq; |
| } |
| } |
| |
| /* attach the mac to the phy */ |
| ret = phy_connect_direct(dev, phydev, &macb_handle_link_change, |
| 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) && bp->caps & MACB_CAPS_GIGABIT_MODE_AVAILABLE) |
| phydev->supported &= PHY_GBIT_FEATURES; |
| else |
| phydev->supported &= PHY_BASIC_FEATURES; |
| |
| if (bp->caps & MACB_CAPS_NO_GIGABIT_HALF) |
| phydev->supported &= ~SUPPORTED_1000baseT_Half; |
| |
| phydev->advertising = phydev->supported; |
| |
| bp->link = 0; |
| bp->speed = 0; |
| bp->duplex = -1; |
| bp->phy_dev = phydev; |
| |
| return 0; |
| } |
| |
| static int macb_mii_init(struct macb *bp) |
| { |
| struct macb_platform_data *pdata; |
| struct device_node *np; |
| int err = -ENXIO, i; |
| |
| /* Enable management port */ |
| macb_writel(bp, NCR, MACB_BIT(MPE)); |
| |
| bp->mii_bus = mdiobus_alloc(); |
| if (!bp->mii_bus) { |
| 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; |
| 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 = dev_get_platdata(&bp->pdev->dev); |
| |
| dev_set_drvdata(&bp->dev->dev, bp->mii_bus); |
| |
| np = bp->pdev->dev.of_node; |
| if (np) { |
| /* try dt phy registration */ |
| err = of_mdiobus_register(bp->mii_bus, np); |
| |
| /* fallback to standard phy registration if no phy were |
| * found during dt phy registration |
| */ |
| if (!err && !phy_find_first(bp->mii_bus)) { |
| for (i = 0; i < PHY_MAX_ADDR; i++) { |
| struct phy_device *phydev; |
| |
| phydev = mdiobus_scan(bp->mii_bus, i); |
| if (IS_ERR(phydev)) { |
| err = PTR_ERR(phydev); |
| break; |
| } |
| } |
| |
| if (err) |
| goto err_out_unregister_bus; |
| } |
| } else { |
| if (pdata) |
| bp->mii_bus->phy_mask = pdata->phy_mask; |
| |
| err = mdiobus_register(bp->mii_bus); |
| } |
| |
| if (err) |
| goto err_out_free_mdiobus; |
| |
| err = macb_mii_probe(bp->dev); |
| if (err) |
| goto err_out_unregister_bus; |
| |
| return 0; |
| |
| err_out_unregister_bus: |
| mdiobus_unregister(bp->mii_bus); |
| err_out_free_mdiobus: |
| mdiobus_free(bp->mii_bus); |
| err_out: |
| return err; |
| } |
| |
| static void macb_update_stats(struct macb *bp) |
| { |
| u32 *p = &bp->hw_stats.macb.rx_pause_frames; |
| u32 *end = &bp->hw_stats.macb.tx_pause_frames + 1; |
| int offset = MACB_PFR; |
| |
| WARN_ON((unsigned long)(end - p - 1) != (MACB_TPF - MACB_PFR) / 4); |
| |
| for (; p < end; p++, offset += 4) |
| *p += bp->macb_reg_readl(bp, offset); |
| } |
| |
| 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_unmap(struct macb *bp, struct macb_tx_skb *tx_skb) |
| { |
| if (tx_skb->mapping) { |
| if (tx_skb->mapped_as_page) |
| dma_unmap_page(&bp->pdev->dev, tx_skb->mapping, |
| tx_skb->size, DMA_TO_DEVICE); |
| else |
| dma_unmap_single(&bp->pdev->dev, tx_skb->mapping, |
| tx_skb->size, DMA_TO_DEVICE); |
| tx_skb->mapping = 0; |
| } |
| |
| if (tx_skb->skb) { |
| dev_kfree_skb_any(tx_skb->skb); |
| tx_skb->skb = NULL; |
| } |
| } |
| |
| static void macb_tx_error_task(struct work_struct *work) |
| { |
| struct macb_queue *queue = container_of(work, struct macb_queue, |
| tx_error_task); |
| struct macb *bp = queue->bp; |
| struct macb_tx_skb *tx_skb; |
| struct macb_dma_desc *desc; |
| struct sk_buff *skb; |
| unsigned int tail; |
| unsigned long flags; |
| |
| netdev_vdbg(bp->dev, "macb_tx_error_task: q = %u, t = %u, h = %u\n", |
| (unsigned int)(queue - bp->queues), |
| queue->tx_tail, queue->tx_head); |
| |
| /* Prevent the queue IRQ handlers from running: each of them may call |
| * macb_tx_interrupt(), which in turn may call netif_wake_subqueue(). |
| * As explained below, we have to halt the transmission before updating |
| * TBQP registers so we call netif_tx_stop_all_queues() to notify the |
| * network engine about the macb/gem being halted. |
| */ |
| spin_lock_irqsave(&bp->lock, flags); |
| |
| /* Make sure nobody is trying to queue up new packets */ |
| netif_tx_stop_all_queues(bp->dev); |
| |
| /* Stop transmission now |
| * (in case we have just queued new packets) |
| * macb/gem must be halted to write TBQP register |
| */ |
| 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"); |
| |
| /* Treat frames in TX queue including the ones that caused the error. |
| * Free transmit buffers in upper layer. |
| */ |
| for (tail = queue->tx_tail; tail != queue->tx_head; tail++) { |
| u32 ctrl; |
| |
| desc = macb_tx_desc(queue, tail); |
| ctrl = desc->ctrl; |
| tx_skb = macb_tx_skb(queue, tail); |
| skb = tx_skb->skb; |
| |
| if (ctrl & MACB_BIT(TX_USED)) { |
| /* skb is set for the last buffer of the frame */ |
| while (!skb) { |
| macb_tx_unmap(bp, tx_skb); |
| tail++; |
| tx_skb = macb_tx_skb(queue, tail); |
| skb = tx_skb->skb; |
| } |
| |
| /* ctrl still refers to the first buffer descriptor |
| * since it's the only one written back by the hardware |
| */ |
| if (!(ctrl & MACB_BIT(TX_BUF_EXHAUSTED))) { |
| 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); |
| } |
| |
| macb_tx_unmap(bp, tx_skb); |
| } |
| |
| /* Set end of TX queue */ |
| desc = macb_tx_desc(queue, 0); |
| desc->addr = 0; |
| desc->ctrl = MACB_BIT(TX_USED); |
| |
| /* Make descriptor updates visible to hardware */ |
| wmb(); |
| |
| /* Reinitialize the TX desc queue */ |
| queue_writel(queue, TBQP, queue->tx_ring_dma); |
| /* Make TX ring reflect state of hardware */ |
| queue->tx_head = 0; |
| queue->tx_tail = 0; |
| |
| /* Housework before enabling TX IRQ */ |
| macb_writel(bp, TSR, macb_readl(bp, TSR)); |
| queue_writel(queue, IER, MACB_TX_INT_FLAGS); |
| |
| /* Now we are ready to start transmission again */ |
| netif_tx_start_all_queues(bp->dev); |
| macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TSTART)); |
| |
| spin_unlock_irqrestore(&bp->lock, flags); |
| } |
| |
| static void macb_tx_interrupt(struct macb_queue *queue) |
| { |
| unsigned int tail; |
| unsigned int head; |
| u32 status; |
| struct macb *bp = queue->bp; |
| u16 queue_index = queue - bp->queues; |
| |
| status = macb_readl(bp, TSR); |
| macb_writel(bp, TSR, status); |
| |
| if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE) |
| queue_writel(queue, ISR, MACB_BIT(TCOMP)); |
| |
| netdev_vdbg(bp->dev, "macb_tx_interrupt status = 0x%03lx\n", |
| (unsigned long)status); |
| |
| head = queue->tx_head; |
| for (tail = queue->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(queue, tail); |
| |
| /* Make hw descriptor updates visible to CPU */ |
| rmb(); |
| |
| ctrl = desc->ctrl; |
| |
| /* TX_USED bit is only set by hardware on the very first buffer |
| * descriptor of the transmitted frame. |
| */ |
| if (!(ctrl & MACB_BIT(TX_USED))) |
| break; |
| |
| /* Process all buffers of the current transmitted frame */ |
| for (;; tail++) { |
| tx_skb = macb_tx_skb(queue, tail); |
| skb = tx_skb->skb; |
| |
| /* First, update TX stats if needed */ |
| if (skb) { |
| netdev_vdbg(bp->dev, "skb %u (data %p) TX complete\n", |
| macb_tx_ring_wrap(tail), skb->data); |
| bp->stats.tx_packets++; |
| bp->stats.tx_bytes += skb->len; |
| } |
| |
| /* Now we can safely release resources */ |
| macb_tx_unmap(bp, tx_skb); |
| |
| /* skb is set only for the last buffer of the frame. |
| * WARNING: at this point skb has been freed by |
| * macb_tx_unmap(). |
| */ |
| if (skb) |
| break; |
| } |
| } |
| |
| queue->tx_tail = tail; |
| if (__netif_subqueue_stopped(bp->dev, queue_index) && |
| CIRC_CNT(queue->tx_head, queue->tx_tail, |
| TX_RING_SIZE) <= MACB_TX_WAKEUP_THRESH) |
| netif_wake_subqueue(bp->dev, queue_index); |
| } |
| |
| static void gem_rx_refill(struct macb *bp) |
| { |
| unsigned int entry; |
| struct sk_buff *skb; |
| dma_addr_t paddr; |
| |
| while (CIRC_SPACE(bp->rx_prepared_head, bp->rx_tail, |
| RX_RING_SIZE) > 0) { |
| entry = macb_rx_ring_wrap(bp->rx_prepared_head); |
| |
| /* Make hw descriptor updates visible to CPU */ |
| rmb(); |
| |
| bp->rx_prepared_head++; |
| |
| if (!bp->rx_skbuff[entry]) { |
| /* allocate sk_buff for this free entry in ring */ |
| skb = netdev_alloc_skb(bp->dev, bp->rx_buffer_size); |
| if (unlikely(!skb)) { |
| netdev_err(bp->dev, |
| "Unable to allocate sk_buff\n"); |
| break; |
| } |
| |
| /* now fill corresponding descriptor entry */ |
| paddr = dma_map_single(&bp->pdev->dev, skb->data, |
| bp->rx_buffer_size, |
| DMA_FROM_DEVICE); |
| if (dma_mapping_error(&bp->pdev->dev, paddr)) { |
| dev_kfree_skb(skb); |
| break; |
| } |
| |
| bp->rx_skbuff[entry] = skb; |
| |
| if (entry == RX_RING_SIZE - 1) |
| paddr |= MACB_BIT(RX_WRAP); |
| bp->rx_ring[entry].addr = paddr; |
| bp->rx_ring[entry].ctrl = 0; |
| |
| /* properly align Ethernet header */ |
| skb_reserve(skb, NET_IP_ALIGN); |
| } else { |
| bp->rx_ring[entry].addr &= ~MACB_BIT(RX_USED); |
| bp->rx_ring[entry].ctrl = 0; |
| } |
| } |
| |
| /* Make descriptor updates visible to hardware */ |
| wmb(); |
| |
| netdev_vdbg(bp->dev, "rx ring: prepared head %d, tail %d\n", |
| bp->rx_prepared_head, bp->rx_tail); |
| } |
| |
| /* 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 gem_rx(struct macb *bp, int budget) |
| { |
| unsigned int len; |
| unsigned int entry; |
| struct sk_buff *skb; |
| struct macb_dma_desc *desc; |
| int count = 0; |
| |
| while (count < budget) { |
| u32 addr, ctrl; |
| |
| entry = macb_rx_ring_wrap(bp->rx_tail); |
| desc = &bp->rx_ring[entry]; |
| |
| /* Make hw descriptor updates visible to CPU */ |
| rmb(); |
| |
| addr = desc->addr; |
| ctrl = desc->ctrl; |
| |
| if (!(addr & MACB_BIT(RX_USED))) |
| break; |
| |
| bp->rx_tail++; |
| count++; |
| |
| if (!(ctrl & MACB_BIT(RX_SOF) && ctrl & MACB_BIT(RX_EOF))) { |
| netdev_err(bp->dev, |
| "not whole frame pointed by descriptor\n"); |
| bp->stats.rx_dropped++; |
| break; |
| } |
| skb = bp->rx_skbuff[entry]; |
| if (unlikely(!skb)) { |
| netdev_err(bp->dev, |
| "inconsistent Rx descriptor chain\n"); |
| bp->stats.rx_dropped++; |
| break; |
| } |
| /* now everything is ready for receiving packet */ |
| bp->rx_skbuff[entry] = NULL; |
| len = ctrl & bp->rx_frm_len_mask; |
| |
| netdev_vdbg(bp->dev, "gem_rx %u (len %u)\n", entry, len); |
| |
| skb_put(skb, len); |
| addr = MACB_BF(RX_WADDR, MACB_BFEXT(RX_WADDR, addr)); |
| dma_unmap_single(&bp->pdev->dev, addr, |
| bp->rx_buffer_size, DMA_FROM_DEVICE); |
| |
| skb->protocol = eth_type_trans(skb, bp->dev); |
| skb_checksum_none_assert(skb); |
| if (bp->dev->features & NETIF_F_RXCSUM && |
| !(bp->dev->flags & IFF_PROMISC) && |
| GEM_BFEXT(RX_CSUM, ctrl) & GEM_RX_CSUM_CHECKED_MASK) |
| skb->ip_summed = CHECKSUM_UNNECESSARY; |
| |
| bp->stats.rx_packets++; |
| bp->stats.rx_bytes += skb->len; |
| |
| #if defined(DEBUG) && defined(VERBOSE_DEBUG) |
| netdev_vdbg(bp->dev, "received skb of length %u, csum: %08x\n", |
| skb->len, skb->csum); |
| print_hex_dump(KERN_DEBUG, " mac: ", DUMP_PREFIX_ADDRESS, 16, 1, |
| skb_mac_header(skb), 16, true); |
| print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_ADDRESS, 16, 1, |
| skb->data, 32, true); |
| #endif |
| |
| netif_receive_skb(skb); |
| } |
| |
| gem_rx_refill(bp); |
| |
| return count; |
| } |
| |
| 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 = desc->ctrl & bp->rx_frm_len_mask; |
| |
| 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 = bp->rx_buffer_size; |
| |
| if (offset + frag_len > len) { |
| if (unlikely(frag != last_frag)) { |
| dev_kfree_skb_any(skb); |
| return -1; |
| } |
| frag_len = len - offset; |
| } |
| skb_copy_to_linear_data_offset(skb, offset, |
| macb_rx_buffer(bp, frag), |
| frag_len); |
| offset += bp->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; |
| } |
| |
| static inline void macb_init_rx_ring(struct macb *bp) |
| { |
| dma_addr_t addr; |
| int i; |
| |
| 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 += bp->rx_buffer_size; |
| } |
| bp->rx_ring[RX_RING_SIZE - 1].addr |= MACB_BIT(RX_WRAP); |
| } |
| |
| static int macb_rx(struct macb *bp, int budget) |
| { |
| bool reset_rx_queue = false; |
| 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; |
| |
| if (unlikely(first_frag == -1)) { |
| reset_rx_queue = true; |
| continue; |
| } |
| |
| dropped = macb_rx_frame(bp, first_frag, tail); |
| first_frag = -1; |
| if (unlikely(dropped < 0)) { |
| reset_rx_queue = true; |
| continue; |
| } |
| if (!dropped) { |
| received++; |
| budget--; |
| } |
| } |
| } |
| |
| if (unlikely(reset_rx_queue)) { |
| unsigned long flags; |
| u32 ctrl; |
| |
| netdev_err(bp->dev, "RX queue corruption: reset it\n"); |
| |
| spin_lock_irqsave(&bp->lock, flags); |
| |
| ctrl = macb_readl(bp, NCR); |
| macb_writel(bp, NCR, ctrl & ~MACB_BIT(RE)); |
| |
| macb_init_rx_ring(bp); |
| macb_writel(bp, RBQP, bp->rx_ring_dma); |
| |
| macb_writel(bp, NCR, ctrl | MACB_BIT(RE)); |
| |
| spin_unlock_irqrestore(&bp->lock, flags); |
| return received; |
| } |
| |
| 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 = bp->macbgem_ops.mog_rx(bp, budget); |
| if (work_done < budget) { |
| napi_complete(napi); |
| |
| /* Packets received while interrupts were disabled */ |
| status = macb_readl(bp, RSR); |
| if (status) { |
| if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE) |
| macb_writel(bp, ISR, MACB_BIT(RCOMP)); |
| napi_reschedule(napi); |
| } else { |
| 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 macb_queue *queue = dev_id; |
| struct macb *bp = queue->bp; |
| struct net_device *dev = bp->dev; |
| u32 status, ctrl; |
| |
| status = queue_readl(queue, ISR); |
| |
| if (unlikely(!status)) |
| return IRQ_NONE; |
| |
| spin_lock(&bp->lock); |
| |
| while (status) { |
| /* close possible race with dev_close */ |
| if (unlikely(!netif_running(dev))) { |
| queue_writel(queue, IDR, -1); |
| if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE) |
| queue_writel(queue, ISR, -1); |
| break; |
| } |
| |
| netdev_vdbg(bp->dev, "queue = %u, isr = 0x%08lx\n", |
| (unsigned int)(queue - bp->queues), |
| (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. |
| */ |
| queue_writel(queue, IDR, MACB_RX_INT_FLAGS); |
| if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE) |
| queue_writel(queue, ISR, MACB_BIT(RCOMP)); |
| |
| 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))) { |
| queue_writel(queue, IDR, MACB_TX_INT_FLAGS); |
| schedule_work(&queue->tx_error_task); |
| |
| if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE) |
| queue_writel(queue, ISR, MACB_TX_ERR_FLAGS); |
| |
| break; |
| } |
| |
| if (status & MACB_BIT(TCOMP)) |
| macb_tx_interrupt(queue); |
| |
| /* 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. |
| */ |
| |
| /* There is a hardware issue under heavy load where DMA can |
| * stop, this causes endless "used buffer descriptor read" |
| * interrupts but it can be cleared by re-enabling RX. See |
| * the at91 manual, section 41.3.1 or the Zynq manual |
| * section 16.7.4 for details. |
| */ |
| if (status & MACB_BIT(RXUBR)) { |
| ctrl = macb_readl(bp, NCR); |
| macb_writel(bp, NCR, ctrl & ~MACB_BIT(RE)); |
| macb_writel(bp, NCR, ctrl | MACB_BIT(RE)); |
| |
| if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE) |
| queue_writel(queue, ISR, MACB_BIT(RXUBR)); |
| } |
| |
| 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 (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE) |
| queue_writel(queue, ISR, MACB_BIT(ISR_ROVR)); |
| } |
| |
| 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"); |
| |
| if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE) |
| queue_writel(queue, ISR, MACB_BIT(HRESP)); |
| } |
| |
| status = queue_readl(queue, 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) |
| { |
| struct macb *bp = netdev_priv(dev); |
| struct macb_queue *queue; |
| unsigned long flags; |
| unsigned int q; |
| |
| local_irq_save(flags); |
| for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) |
| macb_interrupt(dev->irq, queue); |
| local_irq_restore(flags); |
| } |
| #endif |
| |
| static unsigned int macb_tx_map(struct macb *bp, |
| struct macb_queue *queue, |
| struct sk_buff *skb) |
| { |
| dma_addr_t mapping; |
| unsigned int len, entry, i, tx_head = queue->tx_head; |
| struct macb_tx_skb *tx_skb = NULL; |
| struct macb_dma_desc *desc; |
| unsigned int offset, size, count = 0; |
| unsigned int f, nr_frags = skb_shinfo(skb)->nr_frags; |
| unsigned int eof = 1; |
| u32 ctrl; |
| |
| /* First, map non-paged data */ |
| len = skb_headlen(skb); |
| offset = 0; |
| while (len) { |
| size = min(len, bp->max_tx_length); |
| entry = macb_tx_ring_wrap(tx_head); |
| tx_skb = &queue->tx_skb[entry]; |
| |
| mapping = dma_map_single(&bp->pdev->dev, |
| skb->data + offset, |
| size, DMA_TO_DEVICE); |
| if (dma_mapping_error(&bp->pdev->dev, mapping)) |
| goto dma_error; |
| |
| /* Save info to properly release resources */ |
| tx_skb->skb = NULL; |
| tx_skb->mapping = mapping; |
| tx_skb->size = size; |
| tx_skb->mapped_as_page = false; |
| |
| len -= size; |
| offset += size; |
| count++; |
| tx_head++; |
| } |
| |
| /* Then, map paged data from fragments */ |
| for (f = 0; f < nr_frags; f++) { |
| const skb_frag_t *frag = &skb_shinfo(skb)->frags[f]; |
| |
| len = skb_frag_size(frag); |
| offset = 0; |
| while (len) { |
| size = min(len, bp->max_tx_length); |
| entry = macb_tx_ring_wrap(tx_head); |
| tx_skb = &queue->tx_skb[entry]; |
| |
| mapping = skb_frag_dma_map(&bp->pdev->dev, frag, |
| offset, size, DMA_TO_DEVICE); |
| if (dma_mapping_error(&bp->pdev->dev, mapping)) |
| goto dma_error; |
| |
| /* Save info to properly release resources */ |
| tx_skb->skb = NULL; |
| tx_skb->mapping = mapping; |
| tx_skb->size = size; |
| tx_skb->mapped_as_page = true; |
| |
| len -= size; |
| offset += size; |
| count++; |
| tx_head++; |
| } |
| } |
| |
| /* Should never happen */ |
| if (unlikely(!tx_skb)) { |
| netdev_err(bp->dev, "BUG! empty skb!\n"); |
| return 0; |
| } |
| |
| /* This is the last buffer of the frame: save socket buffer */ |
| tx_skb->skb = skb; |
| |
| /* Update TX ring: update buffer descriptors in reverse order |
| * to avoid race condition |
| */ |
| |
| /* Set 'TX_USED' bit in buffer descriptor at tx_head position |
| * to set the end of TX queue |
| */ |
| i = tx_head; |
| entry = macb_tx_ring_wrap(i); |
| ctrl = MACB_BIT(TX_USED); |
| desc = &queue->tx_ring[entry]; |
| desc->ctrl = ctrl; |
| |
| do { |
| i--; |
| entry = macb_tx_ring_wrap(i); |
| tx_skb = &queue->tx_skb[entry]; |
| desc = &queue->tx_ring[entry]; |
| |
| ctrl = (u32)tx_skb->size; |
| if (eof) { |
| ctrl |= MACB_BIT(TX_LAST); |
| eof = 0; |
| } |
| if (unlikely(entry == (TX_RING_SIZE - 1))) |
| ctrl |= MACB_BIT(TX_WRAP); |
| |
| /* Set TX buffer descriptor */ |
| desc->addr = tx_skb->mapping; |
| /* desc->addr must be visible to hardware before clearing |
| * 'TX_USED' bit in desc->ctrl. |
| */ |
| wmb(); |
| desc->ctrl = ctrl; |
| } while (i != queue->tx_head); |
| |
| queue->tx_head = tx_head; |
| |
| return count; |
| |
| dma_error: |
| netdev_err(bp->dev, "TX DMA map failed\n"); |
| |
| for (i = queue->tx_head; i != tx_head; i++) { |
| tx_skb = macb_tx_skb(queue, i); |
| |
| macb_tx_unmap(bp, tx_skb); |
| } |
| |
| return 0; |
| } |
| |
| static int macb_start_xmit(struct sk_buff *skb, struct net_device *dev) |
| { |
| u16 queue_index = skb_get_queue_mapping(skb); |
| struct macb *bp = netdev_priv(dev); |
| struct macb_queue *queue = &bp->queues[queue_index]; |
| unsigned long flags; |
| unsigned int count, nr_frags, frag_size, f; |
| |
| #if defined(DEBUG) && defined(VERBOSE_DEBUG) |
| netdev_vdbg(bp->dev, |
| "start_xmit: queue %hu len %u head %p data %p tail %p end %p\n", |
| queue_index, 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 |
| |
| /* Count how many TX buffer descriptors are needed to send this |
| * socket buffer: skb fragments of jumbo frames may need to be |
| * split into many buffer descriptors. |
| */ |
| count = DIV_ROUND_UP(skb_headlen(skb), bp->max_tx_length); |
| nr_frags = skb_shinfo(skb)->nr_frags; |
| for (f = 0; f < nr_frags; f++) { |
| frag_size = skb_frag_size(&skb_shinfo(skb)->frags[f]); |
| count += DIV_ROUND_UP(frag_size, bp->max_tx_length); |
| } |
| |
| spin_lock_irqsave(&bp->lock, flags); |
| |
| /* This is a hard error, log it. */ |
| if (CIRC_SPACE(queue->tx_head, queue->tx_tail, TX_RING_SIZE) < count) { |
| netif_stop_subqueue(dev, queue_index); |
| spin_unlock_irqrestore(&bp->lock, flags); |
| netdev_dbg(bp->dev, "tx_head = %u, tx_tail = %u\n", |
| queue->tx_head, queue->tx_tail); |
| return NETDEV_TX_BUSY; |
| } |
| |
| /* Map socket buffer for DMA transfer */ |
| if (!macb_tx_map(bp, queue, skb)) { |
| dev_kfree_skb_any(skb); |
| goto unlock; |
| } |
| |
| /* Make newly initialized descriptor visible to hardware */ |
| wmb(); |
| |
| skb_tx_timestamp(skb); |
| |
| macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TSTART)); |
| |
| if (CIRC_SPACE(queue->tx_head, queue->tx_tail, TX_RING_SIZE) < 1) |
| netif_stop_subqueue(dev, queue_index); |
| |
| unlock: |
| spin_unlock_irqrestore(&bp->lock, flags); |
| |
| return NETDEV_TX_OK; |
| } |
| |
| static void macb_init_rx_buffer_size(struct macb *bp, size_t size) |
| { |
| if (!macb_is_gem(bp)) { |
| bp->rx_buffer_size = MACB_RX_BUFFER_SIZE; |
| } else { |
| bp->rx_buffer_size = size; |
| |
| if (bp->rx_buffer_size % RX_BUFFER_MULTIPLE) { |
| netdev_dbg(bp->dev, |
| "RX buffer must be multiple of %d bytes, expanding\n", |
| RX_BUFFER_MULTIPLE); |
| bp->rx_buffer_size = |
| roundup(bp->rx_buffer_size, RX_BUFFER_MULTIPLE); |
| } |
| } |
| |
| netdev_dbg(bp->dev, "mtu [%u] rx_buffer_size [%Zu]\n", |
| bp->dev->mtu, bp->rx_buffer_size); |
| } |
| |
| static void gem_free_rx_buffers(struct macb *bp) |
| { |
| struct sk_buff *skb; |
| struct macb_dma_desc *desc; |
| dma_addr_t addr; |
| int i; |
| |
| if (!bp->rx_skbuff) |
| return; |
| |
| for (i = 0; i < RX_RING_SIZE; i++) { |
| skb = bp->rx_skbuff[i]; |
| |
| if (!skb) |
| continue; |
| |
| desc = &bp->rx_ring[i]; |
| addr = MACB_BF(RX_WADDR, MACB_BFEXT(RX_WADDR, desc->addr)); |
| dma_unmap_single(&bp->pdev->dev, addr, bp->rx_buffer_size, |
| DMA_FROM_DEVICE); |
| dev_kfree_skb_any(skb); |
| skb = NULL; |
| } |
| |
| kfree(bp->rx_skbuff); |
| bp->rx_skbuff = NULL; |
| } |
| |
| static void macb_free_rx_buffers(struct macb *bp) |
| { |
| if (bp->rx_buffers) { |
| dma_free_coherent(&bp->pdev->dev, |
| RX_RING_SIZE * bp->rx_buffer_size, |
| bp->rx_buffers, bp->rx_buffers_dma); |
| bp->rx_buffers = NULL; |
| } |
| } |
| |
| static void macb_free_consistent(struct macb *bp) |
| { |
| struct macb_queue *queue; |
| unsigned int q; |
| |
| bp->macbgem_ops.mog_free_rx_buffers(bp); |
| if (bp->rx_ring) { |
| dma_free_coherent(&bp->pdev->dev, RX_RING_BYTES, |
| bp->rx_ring, bp->rx_ring_dma); |
| bp->rx_ring = NULL; |
| } |
| |
| for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) { |
| kfree(queue->tx_skb); |
| queue->tx_skb = NULL; |
| if (queue->tx_ring) { |
| dma_free_coherent(&bp->pdev->dev, TX_RING_BYTES, |
| queue->tx_ring, queue->tx_ring_dma); |
| queue->tx_ring = NULL; |
| } |
| } |
| } |
| |
| static int gem_alloc_rx_buffers(struct macb *bp) |
| { |
| int size; |
| |
| size = RX_RING_SIZE * sizeof(struct sk_buff *); |
| bp->rx_skbuff = kzalloc(size, GFP_KERNEL); |
| if (!bp->rx_skbuff) |
| return -ENOMEM; |
| |
| netdev_dbg(bp->dev, |
| "Allocated %d RX struct sk_buff entries at %p\n", |
| RX_RING_SIZE, bp->rx_skbuff); |
| return 0; |
| } |
| |
| static int macb_alloc_rx_buffers(struct macb *bp) |
| { |
| int size; |
| |
| size = RX_RING_SIZE * bp->rx_buffer_size; |
| bp->rx_buffers = dma_alloc_coherent(&bp->pdev->dev, size, |
| &bp->rx_buffers_dma, GFP_KERNEL); |
| if (!bp->rx_buffers) |
| return -ENOMEM; |
| |
| 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; |
| } |
| |
| static int macb_alloc_consistent(struct macb *bp) |
| { |
| struct macb_queue *queue; |
| unsigned int q; |
| int size; |
| |
| for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) { |
| size = TX_RING_BYTES; |
| queue->tx_ring = dma_alloc_coherent(&bp->pdev->dev, size, |
| &queue->tx_ring_dma, |
| GFP_KERNEL); |
| if (!queue->tx_ring) |
| goto out_err; |
| netdev_dbg(bp->dev, |
| "Allocated TX ring for queue %u of %d bytes at %08lx (mapped %p)\n", |
| q, size, (unsigned long)queue->tx_ring_dma, |
| queue->tx_ring); |
| |
| size = TX_RING_SIZE * sizeof(struct macb_tx_skb); |
| queue->tx_skb = kmalloc(size, GFP_KERNEL); |
| if (!queue->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); |
| |
| if (bp->macbgem_ops.mog_alloc_rx_buffers(bp)) |
| goto out_err; |
| |
| return 0; |
| |
| out_err: |
| macb_free_consistent(bp); |
| return -ENOMEM; |
| } |
| |
| static void gem_init_rings(struct macb *bp) |
| { |
| struct macb_queue *queue; |
| unsigned int q; |
| int i; |
| |
| for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) { |
| for (i = 0; i < TX_RING_SIZE; i++) { |
| queue->tx_ring[i].addr = 0; |
| queue->tx_ring[i].ctrl = MACB_BIT(TX_USED); |
| } |
| queue->tx_ring[TX_RING_SIZE - 1].ctrl |= MACB_BIT(TX_WRAP); |
| queue->tx_head = 0; |
| queue->tx_tail = 0; |
| } |
| |
| bp->rx_tail = 0; |
| bp->rx_prepared_head = 0; |
| |
| gem_rx_refill(bp); |
| } |
| |
| static void macb_init_rings(struct macb *bp) |
| { |
| int i; |
| |
| macb_init_rx_ring(bp); |
| |
| for (i = 0; i < TX_RING_SIZE; i++) { |
| bp->queues[0].tx_ring[i].addr = 0; |
| bp->queues[0].tx_ring[i].ctrl = MACB_BIT(TX_USED); |
| } |
| bp->queues[0].tx_head = 0; |
| bp->queues[0].tx_tail = 0; |
| bp->queues[0].tx_ring[TX_RING_SIZE - 1].ctrl |= MACB_BIT(TX_WRAP); |
| |
| bp->rx_tail = 0; |
| } |
| |
| static void macb_reset_hw(struct macb *bp) |
| { |
| struct macb_queue *queue; |
| unsigned int q; |
| |
| /* 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 */ |
| for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) { |
| queue_writel(queue, IDR, -1); |
| queue_readl(queue, ISR); |
| if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE) |
| queue_writel(queue, ISR, -1); |
| } |
| } |
| |
| 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 |
| * - use the correct receive buffer size |
| * - set best burst length for DMA operations |
| * (if not supported by FIFO, it will fallback to default) |
| * - set both rx/tx packet buffers to full memory size |
| * These are configurable parameters 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, bp->rx_buffer_size / RX_BUFFER_MULTIPLE); |
| if (bp->dma_burst_length) |
| dmacfg = GEM_BFINS(FBLDO, bp->dma_burst_length, dmacfg); |
| dmacfg |= GEM_BIT(TXPBMS) | GEM_BF(RXBMS, -1L); |
| dmacfg &= ~GEM_BIT(ENDIA_PKT); |
| |
| if (bp->native_io) |
| dmacfg &= ~GEM_BIT(ENDIA_DESC); |
| else |
| dmacfg |= GEM_BIT(ENDIA_DESC); /* CPU in big endian */ |
| |
| if (bp->dev->features & NETIF_F_HW_CSUM) |
| dmacfg |= GEM_BIT(TXCOEN); |
| else |
| dmacfg &= ~GEM_BIT(TXCOEN); |
| netdev_dbg(bp->dev, "Cadence configure DMA with 0x%08x\n", |
| dmacfg); |
| gem_writel(bp, DMACFG, dmacfg); |
| } |
| } |
| |
| static void macb_init_hw(struct macb *bp) |
| { |
| struct macb_queue *queue; |
| unsigned int q; |
| |
| u32 config; |
| |
| macb_reset_hw(bp); |
| macb_set_hwaddr(bp); |
| |
| config = macb_mdc_clk_div(bp); |
| if (bp->phy_interface == PHY_INTERFACE_MODE_SGMII) |
| config |= GEM_BIT(SGMIIEN) | GEM_BIT(PCSSEL); |
| config |= MACB_BF(RBOF, NET_IP_ALIGN); /* Make eth data aligned */ |
| config |= MACB_BIT(PAE); /* PAuse Enable */ |
| config |= MACB_BIT(DRFCS); /* Discard Rx FCS */ |
| if (bp->caps & MACB_CAPS_JUMBO) |
| config |= MACB_BIT(JFRAME); /* Enable jumbo frames */ |
| else |
| config |= MACB_BIT(BIG); /* Receive oversized frames */ |
| if (bp->dev->flags & IFF_PROMISC) |
| config |= MACB_BIT(CAF); /* Copy All Frames */ |
| else if (macb_is_gem(bp) && bp->dev->features & NETIF_F_RXCSUM) |
| config |= GEM_BIT(RXCOEN); |
| if (!(bp->dev->flags & IFF_BROADCAST)) |
| config |= MACB_BIT(NBC); /* No BroadCast */ |
| config |= macb_dbw(bp); |
| macb_writel(bp, NCFGR, config); |
| if ((bp->caps & MACB_CAPS_JUMBO) && bp->jumbo_max_len) |
| gem_writel(bp, JML, bp->jumbo_max_len); |
| bp->speed = SPEED_10; |
| bp->duplex = DUPLEX_HALF; |
| bp->rx_frm_len_mask = MACB_RX_FRMLEN_MASK; |
| if (bp->caps & MACB_CAPS_JUMBO) |
| bp->rx_frm_len_mask = MACB_RX_JFRMLEN_MASK; |
| |
| macb_configure_dma(bp); |
| |
| /* Initialize TX and RX buffers */ |
| macb_writel(bp, RBQP, bp->rx_ring_dma); |
| for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) { |
| queue_writel(queue, TBQP, queue->tx_ring_dma); |
| |
| /* Enable interrupts */ |
| queue_writel(queue, IER, |
| MACB_RX_INT_FLAGS | |
| MACB_TX_INT_FLAGS | |
| MACB_BIT(HRESP)); |
| } |
| |
| /* Enable TX and RX */ |
| macb_writel(bp, NCR, MACB_BIT(RE) | MACB_BIT(TE) | MACB_BIT(MPE)); |
| } |
| |
| /* 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] = 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. */ |
| static 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); |
| |
| /* Disable RX checksum offload */ |
| if (macb_is_gem(bp)) |
| cfg &= ~GEM_BIT(RXCOEN); |
| } else { |
| /* Disable promiscuous mode */ |
| cfg &= ~MACB_BIT(CAF); |
| |
| /* Enable RX checksum offload only if requested */ |
| if (macb_is_gem(bp) && dev->features & NETIF_F_RXCSUM) |
| cfg |= GEM_BIT(RXCOEN); |
| } |
| |
| 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); |
| } |
| |
| static int macb_open(struct net_device *dev) |
| { |
| struct macb *bp = netdev_priv(dev); |
| size_t bufsz = dev->mtu + ETH_HLEN + ETH_FCS_LEN + NET_IP_ALIGN; |
| 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; |
| |
| /* RX buffers initialization */ |
| macb_init_rx_buffer_size(bp, bufsz); |
| |
| 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); |
| |
| bp->macbgem_ops.mog_init_rings(bp); |
| macb_init_hw(bp); |
| |
| /* schedule a link state check */ |
| phy_start(bp->phy_dev); |
| |
| netif_tx_start_all_queues(dev); |
| |
| return 0; |
| } |
| |
| static int macb_close(struct net_device *dev) |
| { |
| struct macb *bp = netdev_priv(dev); |
| unsigned long flags; |
| |
| netif_tx_stop_all_queues(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 int macb_change_mtu(struct net_device *dev, int new_mtu) |
| { |
| struct macb *bp = netdev_priv(dev); |
| u32 max_mtu; |
| |
| if (netif_running(dev)) |
| return -EBUSY; |
| |
| max_mtu = ETH_DATA_LEN; |
| if (bp->caps & MACB_CAPS_JUMBO) |
| max_mtu = gem_readl(bp, JML) - ETH_HLEN - ETH_FCS_LEN; |
| |
| if ((new_mtu > max_mtu) || (new_mtu < GEM_MTU_MIN_SIZE)) |
| return -EINVAL; |
| |
| dev->mtu = new_mtu; |
| |
| return 0; |
| } |
| |
| static void gem_update_stats(struct macb *bp) |
| { |
| unsigned int i; |
| u32 *p = &bp->hw_stats.gem.tx_octets_31_0; |
| |
| for (i = 0; i < GEM_STATS_LEN; ++i, ++p) { |
| u32 offset = gem_statistics[i].offset; |
| u64 val = bp->macb_reg_readl(bp, offset); |
| |
| bp->ethtool_stats[i] += val; |
| *p += val; |
| |
| if (offset == GEM_OCTTXL || offset == GEM_OCTRXL) { |
| /* Add GEM_OCTTXH, GEM_OCTRXH */ |
| val = bp->macb_reg_readl(bp, offset + 4); |
| bp->ethtool_stats[i] += ((u64)val) << 32; |
| *(++p) += val; |
| } |
| } |
| } |
| |
| 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 void gem_get_ethtool_stats(struct net_device *dev, |
| struct ethtool_stats *stats, u64 *data) |
| { |
| struct macb *bp; |
| |
| bp = netdev_priv(dev); |
| gem_update_stats(bp); |
| memcpy(data, &bp->ethtool_stats, sizeof(u64) * GEM_STATS_LEN); |
| } |
| |
| static int gem_get_sset_count(struct net_device *dev, int sset) |
| { |
| switch (sset) { |
| case ETH_SS_STATS: |
| return GEM_STATS_LEN; |
| default: |
| return -EOPNOTSUPP; |
| } |
| } |
| |
| static void gem_get_ethtool_strings(struct net_device *dev, u32 sset, u8 *p) |
| { |
| unsigned int i; |
| |
| switch (sset) { |
| case ETH_SS_STATS: |
| for (i = 0; i < GEM_STATS_LEN; i++, p += ETH_GSTRING_LEN) |
| memcpy(p, gem_statistics[i].stat_string, |
| ETH_GSTRING_LEN); |
| break; |
| } |
| } |
| |
| 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->rx_length_mismatch); |
| nstat->tx_errors = (hwstat->tx_late_cols + |
| hwstat->tx_excessive_cols + |
| hwstat->tx_underruns + |
| hwstat->tx_carrier_errors + |
| hwstat->sqe_test_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->queues[0].tx_tail); |
| head = macb_tx_ring_wrap(bp->queues[0].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->queues[0], tail); |
| regs_buff[11] = macb_tx_dma(&bp->queues[0], head); |
| |
| if (!(bp->caps & MACB_CAPS_USRIO_DISABLED)) |
| regs_buff[12] = macb_or_gem_readl(bp, USRIO); |
| if (macb_is_gem(bp)) |
| regs_buff[13] = gem_readl(bp, DMACFG); |
| } |
| |
| static void macb_get_wol(struct net_device *netdev, struct ethtool_wolinfo *wol) |
| { |
| struct macb *bp = netdev_priv(netdev); |
| |
| wol->supported = 0; |
| wol->wolopts = 0; |
| |
| if (bp->wol & MACB_WOL_HAS_MAGIC_PACKET) { |
| wol->supported = WAKE_MAGIC; |
| |
| if (bp->wol & MACB_WOL_ENABLED) |
| wol->wolopts |= WAKE_MAGIC; |
| } |
| } |
| |
| static int macb_set_wol(struct net_device *netdev, struct ethtool_wolinfo *wol) |
| { |
| struct macb *bp = netdev_priv(netdev); |
| |
| if (!(bp->wol & MACB_WOL_HAS_MAGIC_PACKET) || |
| (wol->wolopts & ~WAKE_MAGIC)) |
| return -EOPNOTSUPP; |
| |
| if (wol->wolopts & WAKE_MAGIC) |
| bp->wol |= MACB_WOL_ENABLED; |
| else |
| bp->wol &= ~MACB_WOL_ENABLED; |
| |
| device_set_wakeup_enable(&bp->pdev->dev, bp->wol & MACB_WOL_ENABLED); |
| |
| return 0; |
| } |
| |
| static 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, |
| .get_wol = macb_get_wol, |
| .set_wol = macb_set_wol, |
| }; |
| |
| static const struct ethtool_ops gem_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, |
| .get_ethtool_stats = gem_get_ethtool_stats, |
| .get_strings = gem_get_ethtool_strings, |
| .get_sset_count = gem_get_sset_count, |
| }; |
| |
| static 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); |
| } |
| |
| static int macb_set_features(struct net_device *netdev, |
| netdev_features_t features) |
| { |
| struct macb *bp = netdev_priv(netdev); |
| netdev_features_t changed = features ^ netdev->features; |
| |
| /* TX checksum offload */ |
| if ((changed & NETIF_F_HW_CSUM) && macb_is_gem(bp)) { |
| u32 dmacfg; |
| |
| dmacfg = gem_readl(bp, DMACFG); |
| if (features & NETIF_F_HW_CSUM) |
| dmacfg |= GEM_BIT(TXCOEN); |
| else |
| dmacfg &= ~GEM_BIT(TXCOEN); |
| gem_writel(bp, DMACFG, dmacfg); |
| } |
| |
| /* RX checksum offload */ |
| if ((changed & NETIF_F_RXCSUM) && macb_is_gem(bp)) { |
| u32 netcfg; |
| |
| netcfg = gem_readl(bp, NCFGR); |
| if (features & NETIF_F_RXCSUM && |
| !(netdev->flags & IFF_PROMISC)) |
| netcfg |= GEM_BIT(RXCOEN); |
| else |
| netcfg &= ~GEM_BIT(RXCOEN); |
| gem_writel(bp, NCFGR, netcfg); |
| } |
| |
| return 0; |
| } |
| |
| 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 = macb_change_mtu, |
| .ndo_set_mac_address = eth_mac_addr, |
| #ifdef CONFIG_NET_POLL_CONTROLLER |
| .ndo_poll_controller = macb_poll_controller, |
| #endif |
| .ndo_set_features = macb_set_features, |
| }; |
| |
| /* Configure peripheral capabilities according to device tree |
| * and integration options used |
| */ |
| static void macb_configure_caps(struct macb *bp, |
| const struct macb_config *dt_conf) |
| { |
| u32 dcfg; |
| |
| if (dt_conf) |
| bp->caps = dt_conf->caps; |
| |
| if (hw_is_gem(bp->regs, bp->native_io)) { |
| bp->caps |= MACB_CAPS_MACB_IS_GEM; |
| |
| dcfg = gem_readl(bp, DCFG1); |
| if (GEM_BFEXT(IRQCOR, dcfg) == 0) |
| bp->caps |= MACB_CAPS_ISR_CLEAR_ON_WRITE; |
| dcfg = gem_readl(bp, DCFG2); |
| if ((dcfg & (GEM_BIT(RX_PKT_BUFF) | GEM_BIT(TX_PKT_BUFF))) == 0) |
| bp->caps |= MACB_CAPS_FIFO_MODE; |
| } |
| |
| dev_dbg(&bp->pdev->dev, "Cadence caps 0x%08x\n", bp->caps); |
| } |
| |
| static void macb_probe_queues(void __iomem *mem, |
| bool native_io, |
| unsigned int *queue_mask, |
| unsigned int *num_queues) |
| { |
| unsigned int hw_q; |
| |
| *queue_mask = 0x1; |
| *num_queues = 1; |
| |
| /* is it macb or gem ? |
| * |
| * We need to read directly from the hardware here because |
| * we are early in the probe process and don't have the |
| * MACB_CAPS_MACB_IS_GEM flag positioned |
| */ |
| if (!hw_is_gem(mem, native_io)) |
| return; |
| |
| /* bit 0 is never set but queue 0 always exists */ |
| *queue_mask = readl_relaxed(mem + GEM_DCFG6) & 0xff; |
| |
| *queue_mask |= 0x1; |
| |
| for (hw_q = 1; hw_q < MACB_MAX_QUEUES; ++hw_q) |
| if (*queue_mask & (1 << hw_q)) |
| (*num_queues)++; |
| } |
| |
| static int macb_clk_init(struct platform_device *pdev, struct clk **pclk, |
| struct clk **hclk, struct clk **tx_clk) |
| { |
| int err; |
| |
| *pclk = devm_clk_get(&pdev->dev, "pclk"); |
| if (IS_ERR(*pclk)) { |
| err = PTR_ERR(*pclk); |
| dev_err(&pdev->dev, "failed to get macb_clk (%u)\n", err); |
| return err; |
| } |
| |
| *hclk = devm_clk_get(&pdev->dev, "hclk"); |
| if (IS_ERR(*hclk)) { |
| err = PTR_ERR(*hclk); |
| dev_err(&pdev->dev, "failed to get hclk (%u)\n", err); |
| return err; |
| } |
| |
| *tx_clk = devm_clk_get(&pdev->dev, "tx_clk"); |
| if (IS_ERR(*tx_clk)) |
| *tx_clk = NULL; |
| |
| err = clk_prepare_enable(*pclk); |
| if (err) { |
| dev_err(&pdev->dev, "failed to enable pclk (%u)\n", err); |
| return err; |
| } |
| |
| err = clk_prepare_enable(*hclk); |
| if (err) { |
| dev_err(&pdev->dev, "failed to enable hclk (%u)\n", err); |
| goto err_disable_pclk; |
| } |
| |
| err = clk_prepare_enable(*tx_clk); |
| if (err) { |
| dev_err(&pdev->dev, "failed to enable tx_clk (%u)\n", err); |
| goto err_disable_hclk; |
| } |
| |
| return 0; |
| |
| err_disable_hclk: |
| clk_disable_unprepare(*hclk); |
| |
| err_disable_pclk: |
| clk_disable_unprepare(*pclk); |
| |
| return err; |
| } |
| |
| static int macb_init(struct platform_device *pdev) |
| { |
| struct net_device *dev = platform_get_drvdata(pdev); |
| unsigned int hw_q, q; |
| struct macb *bp = netdev_priv(dev); |
| struct macb_queue *queue; |
| int err; |
| u32 val; |
| |
| /* set the queue register mapping once for all: queue0 has a special |
| * register mapping but we don't want to test the queue index then |
| * compute the corresponding register offset at run time. |
| */ |
| for (hw_q = 0, q = 0; hw_q < MACB_MAX_QUEUES; ++hw_q) { |
| if (!(bp->queue_mask & (1 << hw_q))) |
| continue; |
| |
| queue = &bp->queues[q]; |
| queue->bp = bp; |
| if (hw_q) { |
| queue->ISR = GEM_ISR(hw_q - 1); |
| queue->IER = GEM_IER(hw_q - 1); |
| queue->IDR = GEM_IDR(hw_q - 1); |
| queue->IMR = GEM_IMR(hw_q - 1); |
| queue->TBQP = GEM_TBQP(hw_q - 1); |
| } else { |
| /* queue0 uses legacy registers */ |
| queue->ISR = MACB_ISR; |
| queue->IER = MACB_IER; |
| queue->IDR = MACB_IDR; |
| queue->IMR = MACB_IMR; |
| queue->TBQP = MACB_TBQP; |
| } |
| |
| /* get irq: here we use the linux queue index, not the hardware |
| * queue index. the queue irq definitions in the device tree |
| * must remove the optional gaps that could exist in the |
| * hardware queue mask. |
| */ |
| queue->irq = platform_get_irq(pdev, q); |
| err = devm_request_irq(&pdev->dev, queue->irq, macb_interrupt, |
| IRQF_SHARED, dev->name, queue); |
| if (err) { |
| dev_err(&pdev->dev, |
| "Unable to request IRQ %d (error %d)\n", |
| queue->irq, err); |
| return err; |
| } |
| |
| INIT_WORK(&queue->tx_error_task, macb_tx_error_task); |
| q++; |
| } |
| |
| dev->netdev_ops = &macb_netdev_ops; |
| netif_napi_add(dev, &bp->napi, macb_poll, 64); |
| |
| /* setup appropriated routines according to adapter type */ |
| if (macb_is_gem(bp)) { |
| bp->max_tx_length = GEM_MAX_TX_LEN; |
| bp->macbgem_ops.mog_alloc_rx_buffers = gem_alloc_rx_buffers; |
| bp->macbgem_ops.mog_free_rx_buffers = gem_free_rx_buffers; |
| bp->macbgem_ops.mog_init_rings = gem_init_rings; |
| bp->macbgem_ops.mog_rx = gem_rx; |
| dev->ethtool_ops = &gem_ethtool_ops; |
| } else { |
| bp->max_tx_length = MACB_MAX_TX_LEN; |
| bp->macbgem_ops.mog_alloc_rx_buffers = macb_alloc_rx_buffers; |
| bp->macbgem_ops.mog_free_rx_buffers = macb_free_rx_buffers; |
| bp->macbgem_ops.mog_init_rings = macb_init_rings; |
| bp->macbgem_ops.mog_rx = macb_rx; |
| dev->ethtool_ops = &macb_ethtool_ops; |
| } |
| |
| /* Set features */ |
| dev->hw_features = NETIF_F_SG; |
| /* Checksum offload is only available on gem with packet buffer */ |
| if (macb_is_gem(bp) && !(bp->caps & MACB_CAPS_FIFO_MODE)) |
| dev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_RXCSUM; |
| if (bp->caps & MACB_CAPS_SG_DISABLED) |
| dev->hw_features &= ~NETIF_F_SG; |
| dev->features = dev->hw_features; |
| |
| if (!(bp->caps & MACB_CAPS_USRIO_DISABLED)) { |
| val = 0; |
| if (bp->phy_interface == PHY_INTERFACE_MODE_RGMII) |
| val = GEM_BIT(RGMII); |
| else if (bp->phy_interface == PHY_INTERFACE_MODE_RMII && |
| (bp->caps & MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII)) |
| val = MACB_BIT(RMII); |
| else if (!(bp->caps & MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII)) |
| val = MACB_BIT(MII); |
| |
| if (bp->caps & MACB_CAPS_USRIO_HAS_CLKEN) |
| val |= MACB_BIT(CLKEN); |
| |
| macb_or_gem_writel(bp, USRIO, val); |
| } |
| |
| /* Set MII management clock divider */ |
| val = macb_mdc_clk_div(bp); |
| val |= macb_dbw(bp); |
| if (bp->phy_interface == PHY_INTERFACE_MODE_SGMII) |
| val |= GEM_BIT(SGMIIEN) | GEM_BIT(PCSSEL); |
| macb_writel(bp, NCFGR, val); |
| |
| return 0; |
| } |
| |
| #if defined(CONFIG_OF) |
| /* 1518 rounded up */ |
| #define AT91ETHER_MAX_RBUFF_SZ 0x600 |
| /* max number of receive buffers */ |
| #define AT91ETHER_MAX_RX_DESCR 9 |
| |
| /* Initialize and start the Receiver and Transmit subsystems */ |
| static int at91ether_start(struct net_device *dev) |
| { |
| struct macb *lp = netdev_priv(dev); |
| dma_addr_t addr; |
| u32 ctl; |
| int i; |
| |
| lp->rx_ring = dma_alloc_coherent(&lp->pdev->dev, |
| (AT91ETHER_MAX_RX_DESCR * |
| sizeof(struct macb_dma_desc)), |
| &lp->rx_ring_dma, GFP_KERNEL); |
| if (!lp->rx_ring) |
| return -ENOMEM; |
| |
| lp->rx_buffers = dma_alloc_coherent(&lp->pdev->dev, |
| AT91ETHER_MAX_RX_DESCR * |
| AT91ETHER_MAX_RBUFF_SZ, |
| &lp->rx_buffers_dma, GFP_KERNEL); |
| if (!lp->rx_buffers) { |
| dma_free_coherent(&lp->pdev->dev, |
| AT91ETHER_MAX_RX_DESCR * |
| sizeof(struct macb_dma_desc), |
| lp->rx_ring, lp->rx_ring_dma); |
| lp->rx_ring = NULL; |
| return -ENOMEM; |
| } |
| |
| addr = lp->rx_buffers_dma; |
| for (i = 0; i < AT91ETHER_MAX_RX_DESCR; i++) { |
| lp->rx_ring[i].addr = addr; |
| lp->rx_ring[i].ctrl = 0; |
| addr += AT91ETHER_MAX_RBUFF_SZ; |
| } |
| |
| /* Set the Wrap bit on the last descriptor */ |
| lp->rx_ring[AT91ETHER_MAX_RX_DESCR - 1].addr |= MACB_BIT(RX_WRAP); |
| |
| /* Reset buffer index */ |
| lp->rx_tail = 0; |
| |
| /* Program address of descriptor list in Rx Buffer Queue register */ |
| macb_writel(lp, RBQP, lp->rx_ring_dma); |
| |
| /* Enable Receive and Transmit */ |
| ctl = macb_readl(lp, NCR); |
| macb_writel(lp, NCR, ctl | MACB_BIT(RE) | MACB_BIT(TE)); |
| |
| return 0; |
| } |
| |
| /* Open the ethernet interface */ |
| static int at91ether_open(struct net_device *dev) |
| { |
| struct macb *lp = netdev_priv(dev); |
| u32 ctl; |
| int ret; |
| |
| /* Clear internal statistics */ |
| ctl = macb_readl(lp, NCR); |
| macb_writel(lp, NCR, ctl | MACB_BIT(CLRSTAT)); |
| |
| macb_set_hwaddr(lp); |
| |
| ret = at91ether_start(dev); |
| if (ret) |
| return ret; |
| |
| /* Enable MAC interrupts */ |
| macb_writel(lp, IER, MACB_BIT(RCOMP) | |
| MACB_BIT(RXUBR) | |
| MACB_BIT(ISR_TUND) | |
| MACB_BIT(ISR_RLE) | |
| MACB_BIT(TCOMP) | |
| MACB_BIT(ISR_ROVR) | |
| MACB_BIT(HRESP)); |
| |
| /* schedule a link state check */ |
| phy_start(lp->phy_dev); |
| |
| netif_start_queue(dev); |
| |
| return 0; |
| } |
| |
| /* Close the interface */ |
| static int at91ether_close(struct net_device *dev) |
| { |
| struct macb *lp = netdev_priv(dev); |
| u32 ctl; |
| |
| /* Disable Receiver and Transmitter */ |
| ctl = macb_readl(lp, NCR); |
| macb_writel(lp, NCR, ctl & ~(MACB_BIT(TE) | MACB_BIT(RE))); |
| |
| /* Disable MAC interrupts */ |
| macb_writel(lp, IDR, MACB_BIT(RCOMP) | |
| MACB_BIT(RXUBR) | |
| MACB_BIT(ISR_TUND) | |
| MACB_BIT(ISR_RLE) | |
| MACB_BIT(TCOMP) | |
| MACB_BIT(ISR_ROVR) | |
| MACB_BIT(HRESP)); |
| |
| netif_stop_queue(dev); |
| |
| dma_free_coherent(&lp->pdev->dev, |
| AT91ETHER_MAX_RX_DESCR * |
| sizeof(struct macb_dma_desc), |
| lp->rx_ring, lp->rx_ring_dma); |
| lp->rx_ring = NULL; |
| |
| dma_free_coherent(&lp->pdev->dev, |
| AT91ETHER_MAX_RX_DESCR * AT91ETHER_MAX_RBUFF_SZ, |
| lp->rx_buffers, lp->rx_buffers_dma); |
| lp->rx_buffers = NULL; |
| |
| return 0; |
| } |
| |
| /* Transmit packet */ |
| static int at91ether_start_xmit(struct sk_buff *skb, struct net_device *dev) |
| { |
| struct macb *lp = netdev_priv(dev); |
| |
| if (macb_readl(lp, TSR) & MACB_BIT(RM9200_BNQ)) { |
| netif_stop_queue(dev); |
| |
| /* Store packet information (to free when Tx completed) */ |
| lp->skb = skb; |
| lp->skb_length = skb->len; |
| lp->skb_physaddr = dma_map_single(NULL, skb->data, skb->len, |
| DMA_TO_DEVICE); |
| |
| /* Set address of the data in the Transmit Address register */ |
| macb_writel(lp, TAR, lp->skb_physaddr); |
| /* Set length of the packet in the Transmit Control register */ |
| macb_writel(lp, TCR, skb->len); |
| |
| } else { |
| netdev_err(dev, "%s called, but device is busy!\n", __func__); |
| return NETDEV_TX_BUSY; |
| } |
| |
| return NETDEV_TX_OK; |
| } |
| |
| /* Extract received frame from buffer descriptors and sent to upper layers. |
| * (Called from interrupt context) |
| */ |
| static void at91ether_rx(struct net_device *dev) |
| { |
| struct macb *lp = netdev_priv(dev); |
| unsigned char *p_recv; |
| struct sk_buff *skb; |
| unsigned int pktlen; |
| |
| while (lp->rx_ring[lp->rx_tail].addr & MACB_BIT(RX_USED)) { |
| p_recv = lp->rx_buffers + lp->rx_tail * AT91ETHER_MAX_RBUFF_SZ; |
| pktlen = MACB_BF(RX_FRMLEN, lp->rx_ring[lp->rx_tail].ctrl); |
| skb = netdev_alloc_skb(dev, pktlen + 2); |
| if (skb) { |
| skb_reserve(skb, 2); |
| memcpy(skb_put(skb, pktlen), p_recv, pktlen); |
| |
| skb->protocol = eth_type_trans(skb, dev); |
| lp->stats.rx_packets++; |
| lp->stats.rx_bytes += pktlen; |
| netif_rx(skb); |
| } else { |
| lp->stats.rx_dropped++; |
| } |
| |
| if (lp->rx_ring[lp->rx_tail].ctrl & MACB_BIT(RX_MHASH_MATCH)) |
| lp->stats.multicast++; |
| |
| /* reset ownership bit */ |
| lp->rx_ring[lp->rx_tail].addr &= ~MACB_BIT(RX_USED); |
| |
| /* wrap after last buffer */ |
| if (lp->rx_tail == AT91ETHER_MAX_RX_DESCR - 1) |
| lp->rx_tail = 0; |
| else |
| lp->rx_tail++; |
| } |
| } |
| |
| /* MAC interrupt handler */ |
| static irqreturn_t at91ether_interrupt(int irq, void *dev_id) |
| { |
| struct net_device *dev = dev_id; |
| struct macb *lp = netdev_priv(dev); |
| u32 intstatus, ctl; |
| |
| /* MAC Interrupt Status register indicates what interrupts are pending. |
| * It is automatically cleared once read. |
| */ |
| intstatus = macb_readl(lp, ISR); |
| |
| /* Receive complete */ |
| if (intstatus & MACB_BIT(RCOMP)) |
| at91ether_rx(dev); |
| |
| /* Transmit complete */ |
| if (intstatus & MACB_BIT(TCOMP)) { |
| /* The TCOM bit is set even if the transmission failed */ |
| if (intstatus & (MACB_BIT(ISR_TUND) | MACB_BIT(ISR_RLE))) |
| lp->stats.tx_errors++; |
| |
| if (lp->skb) { |
| dev_kfree_skb_irq(lp->skb); |
| lp->skb = NULL; |
| dma_unmap_single(NULL, lp->skb_physaddr, |
| lp->skb_length, DMA_TO_DEVICE); |
| lp->stats.tx_packets++; |
| lp->stats.tx_bytes += lp->skb_length; |
| } |
| netif_wake_queue(dev); |
| } |
| |
| /* Work-around for EMAC Errata section 41.3.1 */ |
| if (intstatus & MACB_BIT(RXUBR)) { |
| ctl = macb_readl(lp, NCR); |
| macb_writel(lp, NCR, ctl & ~MACB_BIT(RE)); |
| macb_writel(lp, NCR, ctl | MACB_BIT(RE)); |
| } |
| |
| if (intstatus & MACB_BIT(ISR_ROVR)) |
| netdev_err(dev, "ROVR error\n"); |
| |
| return IRQ_HANDLED; |
| } |
| |
| #ifdef CONFIG_NET_POLL_CONTROLLER |
| static void at91ether_poll_controller(struct net_device *dev) |
| { |
| unsigned long flags; |
| |
| local_irq_save(flags); |
| at91ether_interrupt(dev->irq, dev); |
| local_irq_restore(flags); |
| } |
| #endif |
| |
| static const struct net_device_ops at91ether_netdev_ops = { |
| .ndo_open = at91ether_open, |
| .ndo_stop = at91ether_close, |
| .ndo_start_xmit = at91ether_start_xmit, |
| .ndo_get_stats = macb_get_stats, |
| .ndo_set_rx_mode = macb_set_rx_mode, |
| .ndo_set_mac_address = eth_mac_addr, |
| .ndo_do_ioctl = macb_ioctl, |
| .ndo_validate_addr = eth_validate_addr, |
| .ndo_change_mtu = eth_change_mtu, |
| #ifdef CONFIG_NET_POLL_CONTROLLER |
| .ndo_poll_controller = at91ether_poll_controller, |
| #endif |
| }; |
| |
| static int at91ether_clk_init(struct platform_device *pdev, struct clk **pclk, |
| struct clk **hclk, struct clk **tx_clk) |
| { |
| int err; |
| |
| *hclk = NULL; |
| *tx_clk = NULL; |
| |
| *pclk = devm_clk_get(&pdev->dev, "ether_clk"); |
| if (IS_ERR(*pclk)) |
| return PTR_ERR(*pclk); |
| |
| err = clk_prepare_enable(*pclk); |
| if (err) { |
| dev_err(&pdev->dev, "failed to enable pclk (%u)\n", err); |
| return err; |
| } |
| |
| return 0; |
| } |
| |
| static int at91ether_init(struct platform_device *pdev) |
| { |
| struct net_device *dev = platform_get_drvdata(pdev); |
| struct macb *bp = netdev_priv(dev); |
| int err; |
| u32 reg; |
| |
| dev->netdev_ops = &at91ether_netdev_ops; |
| dev->ethtool_ops = &macb_ethtool_ops; |
| |
| err = devm_request_irq(&pdev->dev, dev->irq, at91ether_interrupt, |
| 0, dev->name, dev); |
| if (err) |
| return err; |
| |
| macb_writel(bp, NCR, 0); |
| |
| reg = MACB_BF(CLK, MACB_CLK_DIV32) | MACB_BIT(BIG); |
| if (bp->phy_interface == PHY_INTERFACE_MODE_RMII) |
| reg |= MACB_BIT(RM9200_RMII); |
| |
| macb_writel(bp, NCFGR, reg); |
| |
| return 0; |
| } |
| |
| static const struct macb_config at91sam9260_config = { |
| .caps = MACB_CAPS_USRIO_HAS_CLKEN | MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII, |
| .clk_init = macb_clk_init, |
| .init = macb_init, |
| }; |
| |
| static const struct macb_config pc302gem_config = { |
| .caps = MACB_CAPS_SG_DISABLED | MACB_CAPS_GIGABIT_MODE_AVAILABLE, |
| .dma_burst_length = 16, |
| .clk_init = macb_clk_init, |
| .init = macb_init, |
| }; |
| |
| static const struct macb_config sama5d2_config = { |
| .caps = MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII, |
| .dma_burst_length = 16, |
| .clk_init = macb_clk_init, |
| .init = macb_init, |
| }; |
| |
| static const struct macb_config sama5d3_config = { |
| .caps = MACB_CAPS_SG_DISABLED | MACB_CAPS_GIGABIT_MODE_AVAILABLE |
| | MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII, |
| .dma_burst_length = 16, |
| .clk_init = macb_clk_init, |
| .init = macb_init, |
| }; |
| |
| static const struct macb_config sama5d4_config = { |
| .caps = MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII, |
| .dma_burst_length = 4, |
| .clk_init = macb_clk_init, |
| .init = macb_init, |
| }; |
| |
| static const struct macb_config emac_config = { |
| .clk_init = at91ether_clk_init, |
| .init = at91ether_init, |
| }; |
| |
| static const struct macb_config np4_config = { |
| .caps = MACB_CAPS_USRIO_DISABLED, |
| .clk_init = macb_clk_init, |
| .init = macb_init, |
| }; |
| |
| static const struct macb_config zynqmp_config = { |
| .caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE | MACB_CAPS_JUMBO, |
| .dma_burst_length = 16, |
| .clk_init = macb_clk_init, |
| .init = macb_init, |
| .jumbo_max_len = 10240, |
| }; |
| |
| static const struct macb_config zynq_config = { |
| .caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE | MACB_CAPS_NO_GIGABIT_HALF, |
| .dma_burst_length = 16, |
| .clk_init = macb_clk_init, |
| .init = macb_init, |
| }; |
| |
| static const struct of_device_id macb_dt_ids[] = { |
| { .compatible = "cdns,at32ap7000-macb" }, |
| { .compatible = "cdns,at91sam9260-macb", .data = &at91sam9260_config }, |
| { .compatible = "cdns,macb" }, |
| { .compatible = "cdns,np4-macb", .data = &np4_config }, |
| { .compatible = "cdns,pc302-gem", .data = &pc302gem_config }, |
| { .compatible = "cdns,gem", .data = &pc302gem_config }, |
| { .compatible = "atmel,sama5d2-gem", .data = &sama5d2_config }, |
| { .compatible = "atmel,sama5d3-gem", .data = &sama5d3_config }, |
| { .compatible = "atmel,sama5d4-gem", .data = &sama5d4_config }, |
| { .compatible = "cdns,at91rm9200-emac", .data = &emac_config }, |
| { .compatible = "cdns,emac", .data = &emac_config }, |
| { .compatible = "cdns,zynqmp-gem", .data = &zynqmp_config}, |
| { .compatible = "cdns,zynq-gem", .data = &zynq_config }, |
| { /* sentinel */ } |
| }; |
| MODULE_DEVICE_TABLE(of, macb_dt_ids); |
| #endif /* CONFIG_OF */ |
| |
| static int macb_probe(struct platform_device *pdev) |
| { |
| int (*clk_init)(struct platform_device *, struct clk **, |
| struct clk **, struct clk **) |
| = macb_clk_init; |
| int (*init)(struct platform_device *) = macb_init; |
| struct device_node *np = pdev->dev.of_node; |
| struct device_node *phy_node; |
| const struct macb_config *macb_config = NULL; |
| struct clk *pclk, *hclk = NULL, *tx_clk = NULL; |
| unsigned int queue_mask, num_queues; |
| struct macb_platform_data *pdata; |
| bool native_io; |
| struct phy_device *phydev; |
| struct net_device *dev; |
| struct resource *regs; |
| void __iomem *mem; |
| const char *mac; |
| struct macb *bp; |
| int err; |
| |
| regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| mem = devm_ioremap_resource(&pdev->dev, regs); |
| if (IS_ERR(mem)) |
| return PTR_ERR(mem); |
| |
| if (np) { |
| const struct of_device_id *match; |
| |
| match = of_match_node(macb_dt_ids, np); |
| if (match && match->data) { |
| macb_config = match->data; |
| clk_init = macb_config->clk_init; |
| init = macb_config->init; |
| } |
| } |
| |
| err = clk_init(pdev, &pclk, &hclk, &tx_clk); |
| if (err) |
| return err; |
| |
| native_io = hw_is_native_io(mem); |
| |
| macb_probe_queues(mem, native_io, &queue_mask, &num_queues); |
| dev = alloc_etherdev_mq(sizeof(*bp), num_queues); |
| if (!dev) { |
| err = -ENOMEM; |
| goto err_disable_clocks; |
| } |
| |
| dev->base_addr = regs->start; |
| |
| SET_NETDEV_DEV(dev, &pdev->dev); |
| |
| bp = netdev_priv(dev); |
| bp->pdev = pdev; |
| bp->dev = dev; |
| bp->regs = mem; |
| bp->native_io = native_io; |
| if (native_io) { |
| bp->macb_reg_readl = hw_readl_native; |
| bp->macb_reg_writel = hw_writel_native; |
| } else { |
| bp->macb_reg_readl = hw_readl; |
| bp->macb_reg_writel = hw_writel; |
| } |
| bp->num_queues = num_queues; |
| bp->queue_mask = queue_mask; |
| if (macb_config) |
| bp->dma_burst_length = macb_config->dma_burst_length; |
| bp->pclk = pclk; |
| bp->hclk = hclk; |
| bp->tx_clk = tx_clk; |
| if (macb_config) |
| bp->jumbo_max_len = macb_config->jumbo_max_len; |
| |
| bp->wol = 0; |
| if (of_get_property(np, "magic-packet", NULL)) |
| bp->wol |= MACB_WOL_HAS_MAGIC_PACKET; |
| device_init_wakeup(&pdev->dev, bp->wol & MACB_WOL_HAS_MAGIC_PACKET); |
| |
| spin_lock_init(&bp->lock); |
| |
| /* setup capabilities */ |
| macb_configure_caps(bp, macb_config); |
| |
| platform_set_drvdata(pdev, dev); |
| |
| dev->irq = platform_get_irq(pdev, 0); |
| if (dev->irq < 0) { |
| err = dev->irq; |
| goto err_disable_clocks; |
| } |
| |
| mac = of_get_mac_address(np); |
| if (mac) |
| ether_addr_copy(bp->dev->dev_addr, mac); |
| else |
| macb_get_hwaddr(bp); |
| |
| /* Power up the PHY if there is a GPIO reset */ |
| phy_node = of_get_next_available_child(np, NULL); |
| if (phy_node) { |
| int gpio = of_get_named_gpio(phy_node, "reset-gpios", 0); |
| |
| if (gpio_is_valid(gpio)) { |
| bp->reset_gpio = gpio_to_desc(gpio); |
| gpiod_direction_output(bp->reset_gpio, 1); |
| } |
| } |
| of_node_put(phy_node); |
| |
| err = of_get_phy_mode(np); |
| if (err < 0) { |
| pdata = dev_get_platdata(&pdev->dev); |
| 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; |
| } |
| |
| /* IP specific init */ |
| err = init(pdev); |
| if (err) |
| goto err_out_free_netdev; |
| |
| err = register_netdev(dev); |
| if (err) { |
| dev_err(&pdev->dev, "Cannot register net device, aborting.\n"); |
| goto err_out_unregister_netdev; |
| } |
| |
| err = macb_mii_init(bp); |
| if (err) |
| goto err_out_unregister_netdev; |
| |
| netif_carrier_off(dev); |
| |
| netdev_info(dev, "Cadence %s rev 0x%08x at 0x%08lx irq %d (%pM)\n", |
| macb_is_gem(bp) ? "GEM" : "MACB", macb_readl(bp, MID), |
| dev->base_addr, dev->irq, dev->dev_addr); |
| |
| phydev = bp->phy_dev; |
| phy_attached_info(phydev); |
| |
| return 0; |
| |
| err_out_unregister_netdev: |
| unregister_netdev(dev); |
| |
| err_out_free_netdev: |
| free_netdev(dev); |
| |
| err_disable_clocks: |
| clk_disable_unprepare(tx_clk); |
| clk_disable_unprepare(hclk); |
| clk_disable_unprepare(pclk); |
| |
| return err; |
| } |
| |
| static int 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); |
| mdiobus_free(bp->mii_bus); |
| |
| /* Shutdown the PHY if there is a GPIO reset */ |
| if (bp->reset_gpio) |
| gpiod_set_value(bp->reset_gpio, 0); |
| |
| unregister_netdev(dev); |
| clk_disable_unprepare(bp->tx_clk); |
| clk_disable_unprepare(bp->hclk); |
| clk_disable_unprepare(bp->pclk); |
| free_netdev(dev); |
| } |
| |
| return 0; |
| } |
| |
| static int __maybe_unused macb_suspend(struct device *dev) |
| { |
| struct platform_device *pdev = to_platform_device(dev); |
| struct net_device *netdev = platform_get_drvdata(pdev); |
| struct macb *bp = netdev_priv(netdev); |
| |
| netif_carrier_off(netdev); |
| netif_device_detach(netdev); |
| |
| if (bp->wol & MACB_WOL_ENABLED) { |
| macb_writel(bp, IER, MACB_BIT(WOL)); |
| macb_writel(bp, WOL, MACB_BIT(MAG)); |
| enable_irq_wake(bp->queues[0].irq); |
| } else { |
| clk_disable_unprepare(bp->tx_clk); |
| clk_disable_unprepare(bp->hclk); |
| clk_disable_unprepare(bp->pclk); |
| } |
| |
| return 0; |
| } |
| |
| static int __maybe_unused macb_resume(struct device *dev) |
| { |
| struct platform_device *pdev = to_platform_device(dev); |
| struct net_device *netdev = platform_get_drvdata(pdev); |
| struct macb *bp = netdev_priv(netdev); |
| |
| if (bp->wol & MACB_WOL_ENABLED) { |
| macb_writel(bp, IDR, MACB_BIT(WOL)); |
| macb_writel(bp, WOL, 0); |
| disable_irq_wake(bp->queues[0].irq); |
| } else { |
| clk_prepare_enable(bp->pclk); |
| clk_prepare_enable(bp->hclk); |
| clk_prepare_enable(bp->tx_clk); |
| } |
| |
| netif_device_attach(netdev); |
| |
| return 0; |
| } |
| |
| static SIMPLE_DEV_PM_OPS(macb_pm_ops, macb_suspend, macb_resume); |
| |
| static struct platform_driver macb_driver = { |
| .probe = macb_probe, |
| .remove = macb_remove, |
| .driver = { |
| .name = "macb", |
| .of_match_table = of_match_ptr(macb_dt_ids), |
| .pm = &macb_pm_ops, |
| }, |
| }; |
| |
| module_platform_driver(macb_driver); |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_DESCRIPTION("Cadence MACB/GEM Ethernet driver"); |
| MODULE_AUTHOR("Haavard Skinnemoen (Atmel)"); |
| MODULE_ALIAS("platform:macb"); |