diff options
Diffstat (limited to 'drivers/net/ethoc.c')
| -rw-r--r-- | drivers/net/ethoc.c | 1112 |
1 files changed, 1112 insertions, 0 deletions
diff --git a/drivers/net/ethoc.c b/drivers/net/ethoc.c new file mode 100644 index 000000000000..91a9b1a33764 --- /dev/null +++ b/drivers/net/ethoc.c @@ -0,0 +1,1112 @@ +/* + * linux/drivers/net/ethoc.c + * + * Copyright (C) 2007-2008 Avionic Design Development GmbH + * Copyright (C) 2008-2009 Avionic Design GmbH + * + * 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. + * + * Written by Thierry Reding <thierry.reding@avionic-design.de> + */ + +#include <linux/etherdevice.h> +#include <linux/crc32.h> +#include <linux/io.h> +#include <linux/mii.h> +#include <linux/phy.h> +#include <linux/platform_device.h> +#include <net/ethoc.h> + +/* register offsets */ +#define MODER 0x00 +#define INT_SOURCE 0x04 +#define INT_MASK 0x08 +#define IPGT 0x0c +#define IPGR1 0x10 +#define IPGR2 0x14 +#define PACKETLEN 0x18 +#define COLLCONF 0x1c +#define TX_BD_NUM 0x20 +#define CTRLMODER 0x24 +#define MIIMODER 0x28 +#define MIICOMMAND 0x2c +#define MIIADDRESS 0x30 +#define MIITX_DATA 0x34 +#define MIIRX_DATA 0x38 +#define MIISTATUS 0x3c +#define MAC_ADDR0 0x40 +#define MAC_ADDR1 0x44 +#define ETH_HASH0 0x48 +#define ETH_HASH1 0x4c +#define ETH_TXCTRL 0x50 + +/* mode register */ +#define MODER_RXEN (1 << 0) /* receive enable */ +#define MODER_TXEN (1 << 1) /* transmit enable */ +#define MODER_NOPRE (1 << 2) /* no preamble */ +#define MODER_BRO (1 << 3) /* broadcast address */ +#define MODER_IAM (1 << 4) /* individual address mode */ +#define MODER_PRO (1 << 5) /* promiscuous mode */ +#define MODER_IFG (1 << 6) /* interframe gap for incoming frames */ +#define MODER_LOOP (1 << 7) /* loopback */ +#define MODER_NBO (1 << 8) /* no back-off */ +#define MODER_EDE (1 << 9) /* excess defer enable */ +#define MODER_FULLD (1 << 10) /* full duplex */ +#define MODER_RESET (1 << 11) /* FIXME: reset (undocumented) */ +#define MODER_DCRC (1 << 12) /* delayed CRC enable */ +#define MODER_CRC (1 << 13) /* CRC enable */ +#define MODER_HUGE (1 << 14) /* huge packets enable */ +#define MODER_PAD (1 << 15) /* padding enabled */ +#define MODER_RSM (1 << 16) /* receive small packets */ + +/* interrupt source and mask registers */ +#define INT_MASK_TXF (1 << 0) /* transmit frame */ +#define INT_MASK_TXE (1 << 1) /* transmit error */ +#define INT_MASK_RXF (1 << 2) /* receive frame */ +#define INT_MASK_RXE (1 << 3) /* receive error */ +#define INT_MASK_BUSY (1 << 4) +#define INT_MASK_TXC (1 << 5) /* transmit control frame */ +#define INT_MASK_RXC (1 << 6) /* receive control frame */ + +#define INT_MASK_TX (INT_MASK_TXF | INT_MASK_TXE) +#define INT_MASK_RX (INT_MASK_RXF | INT_MASK_RXE) + +#define INT_MASK_ALL ( \ + INT_MASK_TXF | INT_MASK_TXE | \ + INT_MASK_RXF | INT_MASK_RXE | \ + INT_MASK_TXC | INT_MASK_RXC | \ + INT_MASK_BUSY \ + ) + +/* packet length register */ +#define PACKETLEN_MIN(min) (((min) & 0xffff) << 16) +#define PACKETLEN_MAX(max) (((max) & 0xffff) << 0) +#define PACKETLEN_MIN_MAX(min, max) (PACKETLEN_MIN(min) | \ + PACKETLEN_MAX(max)) + +/* transmit buffer number register */ +#define TX_BD_NUM_VAL(x) (((x) <= 0x80) ? (x) : 0x80) + +/* control module mode register */ +#define CTRLMODER_PASSALL (1 << 0) /* pass all receive frames */ +#define CTRLMODER_RXFLOW (1 << 1) /* receive control flow */ +#define CTRLMODER_TXFLOW (1 << 2) /* transmit control flow */ + +/* MII mode register */ +#define MIIMODER_CLKDIV(x) ((x) & 0xfe) /* needs to be an even number */ +#define MIIMODER_NOPRE (1 << 8) /* no preamble */ + +/* MII command register */ +#define MIICOMMAND_SCAN (1 << 0) /* scan status */ +#define MIICOMMAND_READ (1 << 1) /* read status */ +#define MIICOMMAND_WRITE (1 << 2) /* write control data */ + +/* MII address register */ +#define MIIADDRESS_FIAD(x) (((x) & 0x1f) << 0) +#define MIIADDRESS_RGAD(x) (((x) & 0x1f) << 8) +#define MIIADDRESS_ADDR(phy, reg) (MIIADDRESS_FIAD(phy) | \ + MIIADDRESS_RGAD(reg)) + +/* MII transmit data register */ +#define MIITX_DATA_VAL(x) ((x) & 0xffff) + +/* MII receive data register */ +#define MIIRX_DATA_VAL(x) ((x) & 0xffff) + +/* MII status register */ +#define MIISTATUS_LINKFAIL (1 << 0) +#define MIISTATUS_BUSY (1 << 1) +#define MIISTATUS_INVALID (1 << 2) + +/* TX buffer descriptor */ +#define TX_BD_CS (1 << 0) /* carrier sense lost */ +#define TX_BD_DF (1 << 1) /* defer indication */ +#define TX_BD_LC (1 << 2) /* late collision */ +#define TX_BD_RL (1 << 3) /* retransmission limit */ +#define TX_BD_RETRY_MASK (0x00f0) +#define TX_BD_RETRY(x) (((x) & 0x00f0) >> 4) +#define TX_BD_UR (1 << 8) /* transmitter underrun */ +#define TX_BD_CRC (1 << 11) /* TX CRC enable */ +#define TX_BD_PAD (1 << 12) /* pad enable for short packets */ +#define TX_BD_WRAP (1 << 13) +#define TX_BD_IRQ (1 << 14) /* interrupt request enable */ +#define TX_BD_READY (1 << 15) /* TX buffer ready */ +#define TX_BD_LEN(x) (((x) & 0xffff) << 16) +#define TX_BD_LEN_MASK (0xffff << 16) + +#define TX_BD_STATS (TX_BD_CS | TX_BD_DF | TX_BD_LC | \ + TX_BD_RL | TX_BD_RETRY_MASK | TX_BD_UR) + +/* RX buffer descriptor */ +#define RX_BD_LC (1 << 0) /* late collision */ +#define RX_BD_CRC (1 << 1) /* RX CRC error */ +#define RX_BD_SF (1 << 2) /* short frame */ +#define RX_BD_TL (1 << 3) /* too long */ +#define RX_BD_DN (1 << 4) /* dribble nibble */ +#define RX_BD_IS (1 << 5) /* invalid symbol */ +#define RX_BD_OR (1 << 6) /* receiver overrun */ +#define RX_BD_MISS (1 << 7) +#define RX_BD_CF (1 << 8) /* control frame */ +#define RX_BD_WRAP (1 << 13) +#define RX_BD_IRQ (1 << 14) /* interrupt request enable */ +#define RX_BD_EMPTY (1 << 15) +#define RX_BD_LEN(x) (((x) & 0xffff) << 16) + +#define RX_BD_STATS (RX_BD_LC | RX_BD_CRC | RX_BD_SF | RX_BD_TL | \ + RX_BD_DN | RX_BD_IS | RX_BD_OR | RX_BD_MISS) + +#define ETHOC_BUFSIZ 1536 +#define ETHOC_ZLEN 64 +#define ETHOC_BD_BASE 0x400 +#define ETHOC_TIMEOUT (HZ / 2) +#define ETHOC_MII_TIMEOUT (1 + (HZ / 5)) + +/** + * struct ethoc - driver-private device structure + * @iobase: pointer to I/O memory region + * @membase: pointer to buffer memory region + * @num_tx: number of send buffers + * @cur_tx: last send buffer written + * @dty_tx: last buffer actually sent + * @num_rx: number of receive buffers + * @cur_rx: current receive buffer + * @netdev: pointer to network device structure + * @napi: NAPI structure + * @stats: network device statistics + * @msg_enable: device state flags + * @rx_lock: receive lock + * @lock: device lock + * @phy: attached PHY + * @mdio: MDIO bus for PHY access + * @phy_id: address of attached PHY + */ +struct ethoc { + void __iomem *iobase; + void __iomem *membase; + + unsigned int num_tx; + unsigned int cur_tx; + unsigned int dty_tx; + + unsigned int num_rx; + unsigned int cur_rx; + + struct net_device *netdev; + struct napi_struct napi; + struct net_device_stats stats; + u32 msg_enable; + + spinlock_t rx_lock; + spinlock_t lock; + + struct phy_device *phy; + struct mii_bus *mdio; + s8 phy_id; +}; + +/** + * struct ethoc_bd - buffer descriptor + * @stat: buffer statistics + * @addr: physical memory address + */ +struct ethoc_bd { + u32 stat; + u32 addr; +}; + +static u32 ethoc_read(struct ethoc *dev, loff_t offset) +{ + return ioread32(dev->iobase + offset); +} + +static void ethoc_write(struct ethoc *dev, loff_t offset, u32 data) +{ + iowrite32(data, dev->iobase + offset); +} + +static void ethoc_read_bd(struct ethoc *dev, int index, struct ethoc_bd *bd) +{ + loff_t offset = ETHOC_BD_BASE + (index * sizeof(struct ethoc_bd)); + bd->stat = ethoc_read(dev, offset + 0); + bd->addr = ethoc_read(dev, offset + 4); +} + +static void ethoc_write_bd(struct ethoc *dev, int index, + const struct ethoc_bd *bd) +{ + loff_t offset = ETHOC_BD_BASE + (index * sizeof(struct ethoc_bd)); + ethoc_write(dev, offset + 0, bd->stat); + ethoc_write(dev, offset + 4, bd->addr); +} + +static void ethoc_enable_irq(struct ethoc *dev, u32 mask) +{ + u32 imask = ethoc_read(dev, INT_MASK); + imask |= mask; + ethoc_write(dev, INT_MASK, imask); +} + +static void ethoc_disable_irq(struct ethoc *dev, u32 mask) +{ + u32 imask = ethoc_read(dev, INT_MASK); + imask &= ~mask; + ethoc_write(dev, INT_MASK, imask); +} + +static void ethoc_ack_irq(struct ethoc *dev, u32 mask) +{ + ethoc_write(dev, INT_SOURCE, mask); +} + +static void ethoc_enable_rx_and_tx(struct ethoc *dev) +{ + u32 mode = ethoc_read(dev, MODER); + mode |= MODER_RXEN | MODER_TXEN; + ethoc_write(dev, MODER, mode); +} + +static void ethoc_disable_rx_and_tx(struct ethoc *dev) +{ + u32 mode = ethoc_read(dev, MODER); + mode &= ~(MODER_RXEN | MODER_TXEN); + ethoc_write(dev, MODER, mode); +} + +static int ethoc_init_ring(struct ethoc *dev) +{ + struct ethoc_bd bd; + int i; + + dev->cur_tx = 0; + dev->dty_tx = 0; + dev->cur_rx = 0; + + /* setup transmission buffers */ + bd.addr = 0; + bd.stat = TX_BD_IRQ | TX_BD_CRC; + + for (i = 0; i < dev->num_tx; i++) { + if (i == dev->num_tx - 1) + bd.stat |= TX_BD_WRAP; + + ethoc_write_bd(dev, i, &bd); + bd.addr += ETHOC_BUFSIZ; + } + + bd.addr = dev->num_tx * ETHOC_BUFSIZ; + bd.stat = RX_BD_EMPTY | RX_BD_IRQ; + + for (i = 0; i < dev->num_rx; i++) { + if (i == dev->num_rx - 1) + bd.stat |= RX_BD_WRAP; + + ethoc_write_bd(dev, dev->num_tx + i, &bd); + bd.addr += ETHOC_BUFSIZ; + } + + return 0; +} + +static int ethoc_reset(struct ethoc *dev) +{ + u32 mode; + + /* TODO: reset controller? */ + + ethoc_disable_rx_and_tx(dev); + + /* TODO: setup registers */ + + /* enable FCS generation and automatic padding */ + mode = ethoc_read(dev, MODER); + mode |= MODER_CRC | MODER_PAD; + ethoc_write(dev, MODER, mode); + + /* set full-duplex mode */ + mode = ethoc_read(dev, MODER); + mode |= MODER_FULLD; + ethoc_write(dev, MODER, mode); + ethoc_write(dev, IPGT, 0x15); + + ethoc_ack_irq(dev, INT_MASK_ALL); + ethoc_enable_irq(dev, INT_MASK_ALL); + ethoc_enable_rx_and_tx(dev); + return 0; +} + +static unsigned int ethoc_update_rx_stats(struct ethoc *dev, + struct ethoc_bd *bd) +{ + struct net_device *netdev = dev->netdev; + unsigned int ret = 0; + + if (bd->stat & RX_BD_TL) { + dev_err(&netdev->dev, "RX: frame too long\n"); + dev->stats.rx_length_errors++; + ret++; + } + + if (bd->stat & RX_BD_SF) { + dev_err(&netdev->dev, "RX: frame too short\n"); + dev->stats.rx_length_errors++; + ret++; + } + + if (bd->stat & RX_BD_DN) { + dev_err(&netdev->dev, "RX: dribble nibble\n"); + dev->stats.rx_frame_errors++; + } + + if (bd->stat & RX_BD_CRC) { + dev_err(&netdev->dev, "RX: wrong CRC\n"); + dev->stats.rx_crc_errors++; + ret++; + } + + if (bd->stat & RX_BD_OR) { + dev_err(&netdev->dev, "RX: overrun\n"); + dev->stats.rx_over_errors++; + ret++; + } + + if (bd->stat & RX_BD_MISS) + dev->stats.rx_missed_errors++; + + if (bd->stat & RX_BD_LC) { + dev_err(&netdev->dev, "RX: late collision\n"); + dev->stats.collisions++; + ret++; + } + + return ret; +} + +static int ethoc_rx(struct net_device *dev, int limit) +{ + struct ethoc *priv = netdev_priv(dev); + int count; + + for (count = 0; count < limit; ++count) { + unsigned int entry; + struct ethoc_bd bd; + + entry = priv->num_tx + (priv->cur_rx % priv->num_rx); + ethoc_read_bd(priv, entry, &bd); + if (bd.stat & RX_BD_EMPTY) + break; + + if (ethoc_update_rx_stats(priv, &bd) == 0) { + int size = bd.stat >> 16; + struct sk_buff *skb = netdev_alloc_skb(dev, size); + if (likely(skb)) { + void *src = priv->membase + bd.addr; + memcpy_fromio(skb_put(skb, size), src, size); + skb->protocol = eth_type_trans(skb, dev); + dev->last_rx = jiffies; + priv->stats.rx_packets++; + priv->stats.rx_bytes += size; + netif_receive_skb(skb); + } else { + if (net_ratelimit()) + dev_warn(&dev->dev, "low on memory - " + "packet dropped\n"); + + priv->stats.rx_dropped++; + break; + } + } + + /* clear the buffer descriptor so it can be reused */ + bd.stat &= ~RX_BD_STATS; + bd.stat |= RX_BD_EMPTY; + ethoc_write_bd(priv, entry, &bd); + priv->cur_rx++; + } + + return count; +} + +static int ethoc_update_tx_stats(struct ethoc *dev, struct ethoc_bd *bd) +{ + struct net_device *netdev = dev->netdev; + + if (bd->stat & TX_BD_LC) { + dev_err(&netdev->dev, "TX: late collision\n"); + dev->stats.tx_window_errors++; + } + + if (bd->stat & TX_BD_RL) { + dev_err(&netdev->dev, "TX: retransmit limit\n"); + dev->stats.tx_aborted_errors++; + } + + if (bd->stat & TX_BD_UR) { + dev_err(&netdev->dev, "TX: underrun\n"); + dev->stats.tx_fifo_errors++; + } + + if (bd->stat & TX_BD_CS) { + dev_err(&netdev->dev, "TX: carrier sense lost\n"); + dev->stats.tx_carrier_errors++; + } + + if (bd->stat & TX_BD_STATS) + dev->stats.tx_errors++; + + dev->stats.collisions += (bd->stat >> 4) & 0xf; + dev->stats.tx_bytes += bd->stat >> 16; + dev->stats.tx_packets++; + return 0; +} + +static void ethoc_tx(struct net_device *dev) +{ + struct ethoc *priv = netdev_priv(dev); + + spin_lock(&priv->lock); + + while (priv->dty_tx != priv->cur_tx) { + unsigned int entry = priv->dty_tx % priv->num_tx; + struct ethoc_bd bd; + + ethoc_read_bd(priv, entry, &bd); + if (bd.stat & TX_BD_READY) + break; + + entry = (++priv->dty_tx) % priv->num_tx; + (void)ethoc_update_tx_stats(priv, &bd); + } + + if ((priv->cur_tx - priv->dty_tx) <= (priv->num_tx / 2)) + netif_wake_queue(dev); + + ethoc_ack_irq(priv, INT_MASK_TX); + spin_unlock(&priv->lock); +} + +static irqreturn_t ethoc_interrupt(int irq, void *dev_id) +{ + struct net_device *dev = (struct net_device *)dev_id; + struct ethoc *priv = netdev_priv(dev); + u32 pending; + + ethoc_disable_irq(priv, INT_MASK_ALL); + pending = ethoc_read(priv, INT_SOURCE); + if (unlikely(pending == 0)) { + ethoc_enable_irq(priv, INT_MASK_ALL); + return IRQ_NONE; + } + + ethoc_ack_irq(priv, INT_MASK_ALL); + + if (pending & INT_MASK_BUSY) { + dev_err(&dev->dev, "packet dropped\n"); + priv->stats.rx_dropped++; + } + + if (pending & INT_MASK_RX) { + if (napi_schedule_prep(&priv->napi)) + __napi_schedule(&priv->napi); + } else { + ethoc_enable_irq(priv, INT_MASK_RX); + } + + if (pending & INT_MASK_TX) + ethoc_tx(dev); + + ethoc_enable_irq(priv, INT_MASK_ALL & ~INT_MASK_RX); + return IRQ_HANDLED; +} + +static int ethoc_get_mac_address(struct net_device *dev, void *addr) +{ + struct ethoc *priv = netdev_priv(dev); + u8 *mac = (u8 *)addr; + u32 reg; + + reg = ethoc_read(priv, MAC_ADDR0); + mac[2] = (reg >> 24) & 0xff; + mac[3] = (reg >> 16) & 0xff; + mac[4] = (reg >> 8) & 0xff; + mac[5] = (reg >> 0) & 0xff; + + reg = ethoc_read(priv, MAC_ADDR1); + mac[0] = (reg >> 8) & 0xff; + mac[1] = (reg >> 0) & 0xff; + + return 0; +} + +static int ethoc_poll(struct napi_struct *napi, int budget) +{ + struct ethoc *priv = container_of(napi, struct ethoc, napi); + int work_done = 0; + + work_done = ethoc_rx(priv->netdev, budget); + if (work_done < budget) { + ethoc_enable_irq(priv, INT_MASK_RX); + napi_complete(napi); + } + + return work_done; +} + +static int ethoc_mdio_read(struct mii_bus *bus, int phy, int reg) +{ + unsigned long timeout = jiffies + ETHOC_MII_TIMEOUT; + struct ethoc *priv = bus->priv; + + ethoc_write(priv, MIIADDRESS, MIIADDRESS_ADDR(phy, reg)); + ethoc_write(priv, MIICOMMAND, MIICOMMAND_READ); + + while (time_before(jiffies, timeout)) { + u32 status = ethoc_read(priv, MIISTATUS); + if (!(status & MIISTATUS_BUSY)) { + u32 data = ethoc_read(priv, MIIRX_DATA); + /* reset MII command register */ + ethoc_write(priv, MIICOMMAND, 0); + return data; + } + + schedule(); + } + + return -EBUSY; +} + +static int ethoc_mdio_write(struct mii_bus *bus, int phy, int reg, u16 val) +{ + unsigned long timeout = jiffies + ETHOC_MII_TIMEOUT; + struct ethoc *priv = bus->priv; + + ethoc_write(priv, MIIADDRESS, MIIADDRESS_ADDR(phy, reg)); + ethoc_write(priv, MIITX_DATA, val); + ethoc_write(priv, MIICOMMAND, MIICOMMAND_WRITE); + + while (time_before(jiffies, timeout)) { + u32 stat = ethoc_read(priv, MIISTATUS); + if (!(stat & MIISTATUS_BUSY)) + return 0; + + schedule(); + } + + return -EBUSY; +} + +static int ethoc_mdio_reset(struct mii_bus *bus) +{ + return 0; +} + +static void ethoc_mdio_poll(struct net_device *dev) +{ +} + +static int ethoc_mdio_probe(struct net_device *dev) +{ + struct ethoc *priv = netdev_priv(dev); + struct phy_device *phy; + int i; + + for (i = 0; i < PHY_MAX_ADDR; i++) { + phy = priv->mdio->phy_map[i]; + if (phy) { + if (priv->phy_id != -1) { + /* attach to specified PHY */ + if (priv->phy_id == phy->addr) + break; + } else { + /* autoselect PHY if none was specified */ + if (phy->addr != 0) + break; + } + } + } + + if (!phy) { + dev_err(&dev->dev, "no PHY found\n"); + return -ENXIO; + } + + phy = phy_connect(dev, dev_name(&phy->dev), ðoc_mdio_poll, 0, + PHY_INTERFACE_MODE_GMII); + if (IS_ERR(phy)) { + dev_err(&dev->dev, "could not attach to PHY\n"); + return PTR_ERR(phy); + } + + priv->phy = phy; + return 0; +} + +static int ethoc_open(struct net_device *dev) +{ + struct ethoc *priv = netdev_priv(dev); + unsigned int min_tx = 2; + unsigned int num_bd; + int ret; + + ret = request_irq(dev->irq, ethoc_interrupt, IRQF_SHARED, + dev->name, dev); + if (ret) + return ret; + + /* calculate the number of TX/RX buffers */ + num_bd = (dev->mem_end - dev->mem_start + 1) / ETHOC_BUFSIZ; + priv->num_tx = min(min_tx, num_bd / 4); + priv->num_rx = num_bd - priv->num_tx; + ethoc_write(priv, TX_BD_NUM, priv->num_tx); + + ethoc_init_ring(priv); + ethoc_reset(priv); + + if (netif_queue_stopped(dev)) { + dev_dbg(&dev->dev, " resuming queue\n"); + netif_wake_queue(dev); + } else { + dev_dbg(&dev->dev, " starting queue\n"); + netif_start_queue(dev); + } + + phy_start(priv->phy); + napi_enable(&priv->napi); + + if (netif_msg_ifup(priv)) { + dev_info(&dev->dev, "I/O: %08lx Memory: %08lx-%08lx\n", + dev->base_addr, dev->mem_start, dev->mem_end); + } + + return 0; +} + +static int ethoc_stop(struct net_device *dev) +{ + struct ethoc *priv = netdev_priv(dev); + + napi_disable(&priv->napi); + + if (priv->phy) + phy_stop(priv->phy); + + ethoc_disable_rx_and_tx(priv); + free_irq(dev->irq, dev); + + if (!netif_queue_stopped(dev)) + netif_stop_queue(dev); + + return 0; +} + +static int ethoc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) +{ + struct ethoc *priv = netdev_priv(dev); + struct mii_ioctl_data *mdio = if_mii(ifr); + struct phy_device *phy = NULL; + + if (!netif_running(dev)) + return -EINVAL; + + if (cmd != SIOCGMIIPHY) { + if (mdio->phy_id >= PHY_MAX_ADDR) + return -ERANGE; + + phy = priv->mdio->phy_map[mdio->phy_id]; + if (!phy) + return -ENODEV; + } else { + phy = priv->phy; + } + + return phy_mii_ioctl(phy, mdio, cmd); +} + +static int ethoc_config(struct net_device *dev, struct ifmap *map) +{ + return -ENOSYS; +} + +static int ethoc_set_mac_address(struct net_device *dev, void *addr) +{ + struct ethoc *priv = netdev_priv(dev); + u8 *mac = (u8 *)addr; + + ethoc_write(priv, MAC_ADDR0, (mac[2] << 24) | (mac[3] << 16) | + (mac[4] << 8) | (mac[5] << 0)); + ethoc_write(priv, MAC_ADDR1, (mac[0] << 8) | (mac[1] << 0)); + + return 0; +} + +static void ethoc_set_multicast_list(struct net_device *dev) +{ + struct ethoc *priv = netdev_priv(dev); + u32 mode = ethoc_read(priv, MODER); + struct dev_mc_list *mc = NULL; + u32 hash[2] = { 0, 0 }; + + /* set loopback mode if requested */ + if (dev->flags & IFF_LOOPBACK) + mode |= MODER_LOOP; + else + mode &= ~MODER_LOOP; + + /* receive broadcast frames if requested */ + if (dev->flags & IFF_BROADCAST) + mode &= ~MODER_BRO; + else + mode |= MODER_BRO; + + /* enable promiscuous mode if requested */ + if (dev->flags & IFF_PROMISC) + mode |= MODER_PRO; + else + mode &= ~MODER_PRO; + + ethoc_write(priv, MODER, mode); + + /* receive multicast frames */ + if (dev->flags & IFF_ALLMULTI) { + hash[0] = 0xffffffff; + hash[1] = 0xffffffff; + } else { + for (mc = dev->mc_list; mc; mc = mc->next) { + u32 crc = ether_crc(mc->dmi_addrlen, mc->dmi_addr); + int bit = (crc >> 26) & 0x3f; + hash[bit >> 5] |= 1 << (bit & 0x1f); + } + } + + ethoc_write(priv, ETH_HASH0, hash[0]); + ethoc_write(priv, ETH_HASH1, hash[1]); +} + +static int ethoc_change_mtu(struct net_device *dev, int new_mtu) +{ + return -ENOSYS; +} + +static void ethoc_tx_timeout(struct net_device *dev) +{ + struct ethoc *priv = netdev_priv(dev); + u32 pending = ethoc_read(priv, INT_SOURCE); + if (likely(pending)) + ethoc_interrupt(dev->irq, dev); +} + +static struct net_device_stats *ethoc_stats(struct net_device *dev) +{ + struct ethoc *priv = netdev_priv(dev); + return &priv->stats; +} + +static int ethoc_start_xmit(struct sk_buff *skb, struct net_device *dev) +{ + struct ethoc *priv = netdev_priv(dev); + struct ethoc_bd bd; + unsigned int entry; + void *dest; + + if (unlikely(skb->len > ETHOC_BUFSIZ)) { + priv->stats.tx_errors++; + return -EMSGSIZE; + } + + entry = priv->cur_tx % priv->num_tx; + spin_lock_irq(&priv->lock); + priv->cur_tx++; + + ethoc_read_bd(priv, entry, &bd); + if (unlikely(skb->len < ETHOC_ZLEN)) + bd.stat |= TX_BD_PAD; + else + bd.stat &= ~TX_BD_PAD; + + dest = priv->membase + bd.addr; + memcpy_toio(dest, skb->data, skb->len); + + bd.stat &= ~(TX_BD_STATS | TX_BD_LEN_MASK); + bd.stat |= TX_BD_LEN(skb->len); + ethoc_write_bd(priv, entry, &bd); + + bd.stat |= TX_BD_READY; + ethoc_write_bd(priv, entry, &bd); + + if (priv->cur_tx == (priv->dty_tx + priv->num_tx)) { + dev_dbg(&dev->dev, "stopping queue\n"); + netif_stop_queue(dev); + } + + dev->trans_start = jiffies; + dev_kfree_skb(skb); + + spin_unlock_irq(&priv->lock); + return NETDEV_TX_OK; +} + +static const struct net_device_ops ethoc_netdev_ops = { + .ndo_open = ethoc_open, + .ndo_stop = ethoc_stop, + .ndo_do_ioctl = ethoc_ioctl, + .ndo_set_config = ethoc_config, + .ndo_set_mac_address = ethoc_set_mac_address, + .ndo_set_multicast_list = ethoc_set_multicast_list, + .ndo_change_mtu = ethoc_change_mtu, + .ndo_tx_timeout = ethoc_tx_timeout, + .ndo_get_stats = ethoc_stats, + .ndo_start_xmit = ethoc_start_xmit, +}; + +/** + * ethoc_probe() - initialize OpenCores ethernet MAC + * pdev: platform device + */ +static int ethoc_probe(struct platform_device *pdev) +{ + struct net_device *netdev = NULL; + struct resource *res = NULL; + struct resource *mmio = NULL; + struct resource *mem = NULL; + struct ethoc *priv = NULL; + unsigned int phy; + int ret = 0; + + /* allocate networking device */ + netdev = alloc_etherdev(sizeof(struct ethoc)); + if (!netdev) { + dev_err(&pdev->dev, "cannot allocate network device\n"); + ret = -ENOMEM; + goto out; + } + + SET_NETDEV_DEV(netdev, &pdev->dev); + platform_set_drvdata(pdev, netdev); + + /* obtain I/O memory space */ + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + dev_err(&pdev->dev, "cannot obtain I/O memory space\n"); + ret = -ENXIO; + goto free; + } + + mmio = devm_request_mem_region(&pdev->dev, res->start, + res->end - res->start + 1, res->name); + if (!res) { + dev_err(&pdev->dev, "cannot request I/O memory space\n"); + ret = -ENXIO; + goto free; + } + + netdev->base_addr = mmio->start; + + /* obtain buffer memory space */ + res = platform_get_resource(pdev, IORESOURCE_MEM, 1); + if (!res) { + dev_err(&pdev->dev, "cannot obtain memory space\n"); + ret = -ENXIO; + goto free; + } + + mem = devm_request_mem_region(&pdev->dev, res->start, + res->end - res->start + 1, res->name); + if (!mem) { + dev_err(&pdev->dev, "cannot request memory space\n"); + ret = -ENXIO; + goto free; + } + + netdev->mem_start = mem->start; + netdev->mem_end = mem->end; + + /* obtain device IRQ number */ + res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); + if (!res) { + dev_err(&pdev->dev, "cannot obtain IRQ\n"); + ret = -ENXIO; + goto free; + } + + netdev->irq = res->start; + + /* setup driver-private data */ + priv = netdev_priv(netdev); + priv->netdev = netdev; + + priv->iobase = devm_ioremap_nocache(&pdev->dev, netdev->base_addr, + mmio->end - mmio->start + 1); + if (!priv->iobase) { + dev_err(&pdev->dev, "cannot remap I/O memory space\n"); + ret = -ENXIO; + goto error; + } + + priv->membase = devm_ioremap_nocache(&pdev->dev, netdev->mem_start, + mem->end - mem->start + 1); + if (!priv->membase) { + dev_err(&pdev->dev, "cannot remap memory space\n"); + ret = -ENXIO; + goto error; + } + + /* Allow the platform setup code to pass in a MAC address. */ + if (pdev->dev.platform_data) { + struct ethoc_platform_data *pdata = + (struct ethoc_platform_data *)pdev->dev.platform_data; + memcpy(netdev->dev_addr, pdata->hwaddr, IFHWADDRLEN); + priv->phy_id = pdata->phy_id; + } + + /* Check that the given MAC address is valid. If it isn't, read the + * current MAC from the controller. */ + if (!is_valid_ether_addr(netdev->dev_addr)) + ethoc_get_mac_address(netdev, netdev->dev_addr); + + /* Check the MAC again for validity, if it still isn't choose and + * program a random one. */ + if (!is_valid_ether_addr(netdev->dev_addr)) + random_ether_addr(netdev->dev_addr); + + ethoc_set_mac_address(netdev, netdev->dev_addr); + + /* register MII bus */ + priv->mdio = mdiobus_alloc(); + if (!priv->mdio) { + ret = -ENOMEM; + goto free; + } + + priv->mdio->name = "ethoc-mdio"; + snprintf(priv->mdio->id, MII_BUS_ID_SIZE, "%s-%d", + priv->mdio->name, pdev->id); + priv->mdio->read = ethoc_mdio_read; + priv->mdio->write = ethoc_mdio_write; + priv->mdio->reset = ethoc_mdio_reset; + priv->mdio->priv = priv; + + priv->mdio->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL); + if (!priv->mdio->irq) { + ret = -ENOMEM; + goto free_mdio; + } + + for (phy = 0; phy < PHY_MAX_ADDR; phy++) + priv->mdio->irq[phy] = PHY_POLL; + + ret = mdiobus_register(priv->mdio); + if (ret) { + dev_err(&netdev->dev, "failed to register MDIO bus\n"); + goto free_mdio; + } + + ret = ethoc_mdio_probe(netdev); + if (ret) { + dev_err(&netdev->dev, "failed to probe MDIO bus\n"); + goto error; + } + + ether_setup(netdev); + + /* setup the net_device structure */ + netdev->netdev_ops = ðoc_netdev_ops; + netdev->watchdog_timeo = ETHOC_TIMEOUT; + netdev->features |= 0; + + /* setup NAPI */ + memset(&priv->napi, 0, sizeof(priv->napi)); + netif_napi_add(netdev, &priv->napi, ethoc_poll, 64); + + spin_lock_init(&priv->rx_lock); + spin_lock_init(&priv->lock); + + ret = register_netdev(netdev); + if (ret < 0) { + dev_err(&netdev->dev, "failed to register interface\n"); + goto error; + } + + goto out; + +error: + mdiobus_unregister(priv->mdio); +free_mdio: + kfree(priv->mdio->irq); + mdiobus_free(priv->mdio); +free: + free_netdev(netdev); +out: + return ret; +} + +/** + * ethoc_remove() - shutdown OpenCores ethernet MAC + * @pdev: platform device + */ +static int ethoc_remove(struct platform_device *pdev) +{ + struct net_device *netdev = platform_get_drvdata(pdev); + struct ethoc *priv = netdev_priv(netdev); + + platform_set_drvdata(pdev, NULL); + + if (netdev) { + phy_disconnect(priv->phy); + priv->phy = NULL; + + if (priv->mdio) { + mdiobus_unregister(priv->mdio); + kfree(priv->mdio->irq); + mdiobus_free(priv->mdio); + } + + unregister_netdev(netdev); + free_netdev(netdev); + } + + return 0; +} + +#ifdef CONFIG_PM +static int ethoc_suspend(struct platform_device *pdev, pm_message_t state) +{ + return -ENOSYS; +} + +static int ethoc_resume(struct platform_device *pdev) +{ + return -ENOSYS; +} +#else +# define ethoc_suspend NULL +# define ethoc_resume NULL +#endif + +static struct platform_driver ethoc_driver = { + .probe = ethoc_probe, + .remove = ethoc_remove, + .suspend = ethoc_suspend, + .resume = ethoc_resume, + .driver = { + .name = "ethoc", + }, +}; + +static int __init ethoc_init(void) +{ + return platform_driver_register(ðoc_driver); +} + +static void __exit ethoc_exit(void) +{ + platform_driver_unregister(ðoc_driver); +} + +module_init(ethoc_init); +module_exit(ethoc_exit); + +MODULE_AUTHOR("Thierry Reding <thierry.reding@avionic-design.de>"); +MODULE_DESCRIPTION("OpenCores Ethernet MAC driver"); +MODULE_LICENSE("GPL v2"); + |