1e4f2379dSAlexey Brodkin /* 2e4f2379dSAlexey Brodkin * Copyright (C) 2004-2013 Synopsys, Inc. (www.synopsys.com) 3e4f2379dSAlexey Brodkin * 4e4f2379dSAlexey Brodkin * This program is free software; you can redistribute it and/or modify 5e4f2379dSAlexey Brodkin * it under the terms of the GNU General Public License version 2 as 6e4f2379dSAlexey Brodkin * published by the Free Software Foundation. 7e4f2379dSAlexey Brodkin * 8e4f2379dSAlexey Brodkin * Driver for the ARC EMAC 10100 (hardware revision 5) 9e4f2379dSAlexey Brodkin * 10e4f2379dSAlexey Brodkin * Contributors: 11e4f2379dSAlexey Brodkin * Amit Bhor 12e4f2379dSAlexey Brodkin * Sameer Dhavale 13e4f2379dSAlexey Brodkin * Vineet Gupta 14e4f2379dSAlexey Brodkin */ 15e4f2379dSAlexey Brodkin 16775dd682SBeniamino Galvani #include <linux/crc32.h> 17e4f2379dSAlexey Brodkin #include <linux/etherdevice.h> 18e4f2379dSAlexey Brodkin #include <linux/interrupt.h> 19e4f2379dSAlexey Brodkin #include <linux/io.h> 20e4f2379dSAlexey Brodkin #include <linux/module.h> 21e4f2379dSAlexey Brodkin #include <linux/of_address.h> 22e4f2379dSAlexey Brodkin #include <linux/of_irq.h> 23e4f2379dSAlexey Brodkin #include <linux/of_mdio.h> 24e4f2379dSAlexey Brodkin #include <linux/of_net.h> 25e4f2379dSAlexey Brodkin #include <linux/of_platform.h> 26e4f2379dSAlexey Brodkin 27e4f2379dSAlexey Brodkin #include "emac.h" 28e4f2379dSAlexey Brodkin 29e4f2379dSAlexey Brodkin 30e4f2379dSAlexey Brodkin /** 3174dd40bcSBeniamino Galvani * arc_emac_tx_avail - Return the number of available slots in the tx ring. 3274dd40bcSBeniamino Galvani * @priv: Pointer to ARC EMAC private data structure. 3374dd40bcSBeniamino Galvani * 3474dd40bcSBeniamino Galvani * returns: the number of slots available for transmission in tx the ring. 3574dd40bcSBeniamino Galvani */ 3674dd40bcSBeniamino Galvani static inline int arc_emac_tx_avail(struct arc_emac_priv *priv) 3774dd40bcSBeniamino Galvani { 3874dd40bcSBeniamino Galvani return (priv->txbd_dirty + TX_BD_NUM - priv->txbd_curr - 1) % TX_BD_NUM; 3974dd40bcSBeniamino Galvani } 4074dd40bcSBeniamino Galvani 4174dd40bcSBeniamino Galvani /** 42e4f2379dSAlexey Brodkin * arc_emac_adjust_link - Adjust the PHY link duplex. 43e4f2379dSAlexey Brodkin * @ndev: Pointer to the net_device structure. 44e4f2379dSAlexey Brodkin * 45e4f2379dSAlexey Brodkin * This function is called to change the duplex setting after auto negotiation 46e4f2379dSAlexey Brodkin * is done by the PHY. 47e4f2379dSAlexey Brodkin */ 48e4f2379dSAlexey Brodkin static void arc_emac_adjust_link(struct net_device *ndev) 49e4f2379dSAlexey Brodkin { 50e4f2379dSAlexey Brodkin struct arc_emac_priv *priv = netdev_priv(ndev); 51e4f2379dSAlexey Brodkin struct phy_device *phy_dev = priv->phy_dev; 52e4f2379dSAlexey Brodkin unsigned int reg, state_changed = 0; 53e4f2379dSAlexey Brodkin 54e4f2379dSAlexey Brodkin if (priv->link != phy_dev->link) { 55e4f2379dSAlexey Brodkin priv->link = phy_dev->link; 56e4f2379dSAlexey Brodkin state_changed = 1; 57e4f2379dSAlexey Brodkin } 58e4f2379dSAlexey Brodkin 59e4f2379dSAlexey Brodkin if (priv->speed != phy_dev->speed) { 60e4f2379dSAlexey Brodkin priv->speed = phy_dev->speed; 61e4f2379dSAlexey Brodkin state_changed = 1; 626eacf311SRomain Perier if (priv->set_mac_speed) 636eacf311SRomain Perier priv->set_mac_speed(priv, priv->speed); 64e4f2379dSAlexey Brodkin } 65e4f2379dSAlexey Brodkin 66e4f2379dSAlexey Brodkin if (priv->duplex != phy_dev->duplex) { 67e4f2379dSAlexey Brodkin reg = arc_reg_get(priv, R_CTRL); 68e4f2379dSAlexey Brodkin 69e4f2379dSAlexey Brodkin if (DUPLEX_FULL == phy_dev->duplex) 70e4f2379dSAlexey Brodkin reg |= ENFL_MASK; 71e4f2379dSAlexey Brodkin else 72e4f2379dSAlexey Brodkin reg &= ~ENFL_MASK; 73e4f2379dSAlexey Brodkin 74e4f2379dSAlexey Brodkin arc_reg_set(priv, R_CTRL, reg); 75e4f2379dSAlexey Brodkin priv->duplex = phy_dev->duplex; 76e4f2379dSAlexey Brodkin state_changed = 1; 77e4f2379dSAlexey Brodkin } 78e4f2379dSAlexey Brodkin 79e4f2379dSAlexey Brodkin if (state_changed) 80e4f2379dSAlexey Brodkin phy_print_status(phy_dev); 81e4f2379dSAlexey Brodkin } 82e4f2379dSAlexey Brodkin 83e4f2379dSAlexey Brodkin /** 84e4f2379dSAlexey Brodkin * arc_emac_get_settings - Get PHY settings. 85e4f2379dSAlexey Brodkin * @ndev: Pointer to net_device structure. 86e4f2379dSAlexey Brodkin * @cmd: Pointer to ethtool_cmd structure. 87e4f2379dSAlexey Brodkin * 88e4f2379dSAlexey Brodkin * This implements ethtool command for getting PHY settings. If PHY could 89e4f2379dSAlexey Brodkin * not be found, the function returns -ENODEV. This function calls the 90e4f2379dSAlexey Brodkin * relevant PHY ethtool API to get the PHY settings. 91e4f2379dSAlexey Brodkin * Issue "ethtool ethX" under linux prompt to execute this function. 92e4f2379dSAlexey Brodkin */ 93e4f2379dSAlexey Brodkin static int arc_emac_get_settings(struct net_device *ndev, 94e4f2379dSAlexey Brodkin struct ethtool_cmd *cmd) 95e4f2379dSAlexey Brodkin { 96e4f2379dSAlexey Brodkin struct arc_emac_priv *priv = netdev_priv(ndev); 97e4f2379dSAlexey Brodkin 98e4f2379dSAlexey Brodkin return phy_ethtool_gset(priv->phy_dev, cmd); 99e4f2379dSAlexey Brodkin } 100e4f2379dSAlexey Brodkin 101e4f2379dSAlexey Brodkin /** 102e4f2379dSAlexey Brodkin * arc_emac_set_settings - Set PHY settings as passed in the argument. 103e4f2379dSAlexey Brodkin * @ndev: Pointer to net_device structure. 104e4f2379dSAlexey Brodkin * @cmd: Pointer to ethtool_cmd structure. 105e4f2379dSAlexey Brodkin * 106e4f2379dSAlexey Brodkin * This implements ethtool command for setting various PHY settings. If PHY 107e4f2379dSAlexey Brodkin * could not be found, the function returns -ENODEV. This function calls the 108e4f2379dSAlexey Brodkin * relevant PHY ethtool API to set the PHY. 109e4f2379dSAlexey Brodkin * Issue e.g. "ethtool -s ethX speed 1000" under linux prompt to execute this 110e4f2379dSAlexey Brodkin * function. 111e4f2379dSAlexey Brodkin */ 112e4f2379dSAlexey Brodkin static int arc_emac_set_settings(struct net_device *ndev, 113e4f2379dSAlexey Brodkin struct ethtool_cmd *cmd) 114e4f2379dSAlexey Brodkin { 115e4f2379dSAlexey Brodkin struct arc_emac_priv *priv = netdev_priv(ndev); 116e4f2379dSAlexey Brodkin 117e4f2379dSAlexey Brodkin if (!capable(CAP_NET_ADMIN)) 118e4f2379dSAlexey Brodkin return -EPERM; 119e4f2379dSAlexey Brodkin 120e4f2379dSAlexey Brodkin return phy_ethtool_sset(priv->phy_dev, cmd); 121e4f2379dSAlexey Brodkin } 122e4f2379dSAlexey Brodkin 123e4f2379dSAlexey Brodkin /** 124e4f2379dSAlexey Brodkin * arc_emac_get_drvinfo - Get EMAC driver information. 125e4f2379dSAlexey Brodkin * @ndev: Pointer to net_device structure. 126e4f2379dSAlexey Brodkin * @info: Pointer to ethtool_drvinfo structure. 127e4f2379dSAlexey Brodkin * 128e4f2379dSAlexey Brodkin * This implements ethtool command for getting the driver information. 129e4f2379dSAlexey Brodkin * Issue "ethtool -i ethX" under linux prompt to execute this function. 130e4f2379dSAlexey Brodkin */ 131e4f2379dSAlexey Brodkin static void arc_emac_get_drvinfo(struct net_device *ndev, 132e4f2379dSAlexey Brodkin struct ethtool_drvinfo *info) 133e4f2379dSAlexey Brodkin { 13423d2d9a6SRomain Perier struct arc_emac_priv *priv = netdev_priv(ndev); 13523d2d9a6SRomain Perier 13623d2d9a6SRomain Perier strlcpy(info->driver, priv->drv_name, sizeof(info->driver)); 13723d2d9a6SRomain Perier strlcpy(info->version, priv->drv_version, sizeof(info->version)); 138e4f2379dSAlexey Brodkin } 139e4f2379dSAlexey Brodkin 140e4f2379dSAlexey Brodkin static const struct ethtool_ops arc_emac_ethtool_ops = { 141e4f2379dSAlexey Brodkin .get_settings = arc_emac_get_settings, 142e4f2379dSAlexey Brodkin .set_settings = arc_emac_set_settings, 143e4f2379dSAlexey Brodkin .get_drvinfo = arc_emac_get_drvinfo, 144e4f2379dSAlexey Brodkin .get_link = ethtool_op_get_link, 145e4f2379dSAlexey Brodkin }; 146e4f2379dSAlexey Brodkin 147e4f2379dSAlexey Brodkin #define FIRST_OR_LAST_MASK (FIRST_MASK | LAST_MASK) 148e4f2379dSAlexey Brodkin 149e4f2379dSAlexey Brodkin /** 150e4f2379dSAlexey Brodkin * arc_emac_tx_clean - clears processed by EMAC Tx BDs. 151e4f2379dSAlexey Brodkin * @ndev: Pointer to the network device. 152e4f2379dSAlexey Brodkin */ 153e4f2379dSAlexey Brodkin static void arc_emac_tx_clean(struct net_device *ndev) 154e4f2379dSAlexey Brodkin { 155e4f2379dSAlexey Brodkin struct arc_emac_priv *priv = netdev_priv(ndev); 156ff458f6fSTobias Klauser struct net_device_stats *stats = &ndev->stats; 157e4f2379dSAlexey Brodkin unsigned int i; 158e4f2379dSAlexey Brodkin 159e4f2379dSAlexey Brodkin for (i = 0; i < TX_BD_NUM; i++) { 160e4f2379dSAlexey Brodkin unsigned int *txbd_dirty = &priv->txbd_dirty; 161e4f2379dSAlexey Brodkin struct arc_emac_bd *txbd = &priv->txbd[*txbd_dirty]; 162e4f2379dSAlexey Brodkin struct buffer_state *tx_buff = &priv->tx_buff[*txbd_dirty]; 163e4f2379dSAlexey Brodkin struct sk_buff *skb = tx_buff->skb; 164e4f2379dSAlexey Brodkin unsigned int info = le32_to_cpu(txbd->info); 165e4f2379dSAlexey Brodkin 166c278c253SAlexander Kochetkov if ((info & FOR_EMAC) || !txbd->data || !skb) 167e4f2379dSAlexey Brodkin break; 168e4f2379dSAlexey Brodkin 169e4f2379dSAlexey Brodkin if (unlikely(info & (DROP | DEFR | LTCL | UFLO))) { 170e4f2379dSAlexey Brodkin stats->tx_errors++; 171e4f2379dSAlexey Brodkin stats->tx_dropped++; 172e4f2379dSAlexey Brodkin 173e4f2379dSAlexey Brodkin if (info & DEFR) 174e4f2379dSAlexey Brodkin stats->tx_carrier_errors++; 175e4f2379dSAlexey Brodkin 176e4f2379dSAlexey Brodkin if (info & LTCL) 177e4f2379dSAlexey Brodkin stats->collisions++; 178e4f2379dSAlexey Brodkin 179e4f2379dSAlexey Brodkin if (info & UFLO) 180e4f2379dSAlexey Brodkin stats->tx_fifo_errors++; 181e4f2379dSAlexey Brodkin } else if (likely(info & FIRST_OR_LAST_MASK)) { 182e4f2379dSAlexey Brodkin stats->tx_packets++; 183e4f2379dSAlexey Brodkin stats->tx_bytes += skb->len; 184e4f2379dSAlexey Brodkin } 185e4f2379dSAlexey Brodkin 186a4a1139bSAlexey Brodkin dma_unmap_single(&ndev->dev, dma_unmap_addr(tx_buff, addr), 187a4a1139bSAlexey Brodkin dma_unmap_len(tx_buff, len), DMA_TO_DEVICE); 188e4f2379dSAlexey Brodkin 189e4f2379dSAlexey Brodkin /* return the sk_buff to system */ 190e4f2379dSAlexey Brodkin dev_kfree_skb_irq(skb); 191e4f2379dSAlexey Brodkin 192e4f2379dSAlexey Brodkin txbd->data = 0; 193e4f2379dSAlexey Brodkin txbd->info = 0; 194c278c253SAlexander Kochetkov tx_buff->skb = NULL; 195e4f2379dSAlexey Brodkin 19627082ee1SVineet Gupta *txbd_dirty = (*txbd_dirty + 1) % TX_BD_NUM; 197e4f2379dSAlexey Brodkin } 19874dd40bcSBeniamino Galvani 19974dd40bcSBeniamino Galvani /* Ensure that txbd_dirty is visible to tx() before checking 20074dd40bcSBeniamino Galvani * for queue stopped. 20174dd40bcSBeniamino Galvani */ 20274dd40bcSBeniamino Galvani smp_mb(); 20374dd40bcSBeniamino Galvani 20474dd40bcSBeniamino Galvani if (netif_queue_stopped(ndev) && arc_emac_tx_avail(priv)) 20574dd40bcSBeniamino Galvani netif_wake_queue(ndev); 206e4f2379dSAlexey Brodkin } 207e4f2379dSAlexey Brodkin 208e4f2379dSAlexey Brodkin /** 209e4f2379dSAlexey Brodkin * arc_emac_rx - processing of Rx packets. 210e4f2379dSAlexey Brodkin * @ndev: Pointer to the network device. 211e4f2379dSAlexey Brodkin * @budget: How many BDs to process on 1 call. 212e4f2379dSAlexey Brodkin * 213e4f2379dSAlexey Brodkin * returns: Number of processed BDs 214e4f2379dSAlexey Brodkin * 215e4f2379dSAlexey Brodkin * Iterate through Rx BDs and deliver received packages to upper layer. 216e4f2379dSAlexey Brodkin */ 217e4f2379dSAlexey Brodkin static int arc_emac_rx(struct net_device *ndev, int budget) 218e4f2379dSAlexey Brodkin { 219e4f2379dSAlexey Brodkin struct arc_emac_priv *priv = netdev_priv(ndev); 220e4f2379dSAlexey Brodkin unsigned int work_done; 221e4f2379dSAlexey Brodkin 2229cff866eSAlexey Brodkin for (work_done = 0; work_done < budget; work_done++) { 223e4f2379dSAlexey Brodkin unsigned int *last_rx_bd = &priv->last_rx_bd; 224ff458f6fSTobias Klauser struct net_device_stats *stats = &ndev->stats; 225e4f2379dSAlexey Brodkin struct buffer_state *rx_buff = &priv->rx_buff[*last_rx_bd]; 226e4f2379dSAlexey Brodkin struct arc_emac_bd *rxbd = &priv->rxbd[*last_rx_bd]; 227e4f2379dSAlexey Brodkin unsigned int pktlen, info = le32_to_cpu(rxbd->info); 228e4f2379dSAlexey Brodkin struct sk_buff *skb; 229e4f2379dSAlexey Brodkin dma_addr_t addr; 230e4f2379dSAlexey Brodkin 231e4f2379dSAlexey Brodkin if (unlikely((info & OWN_MASK) == FOR_EMAC)) 232e4f2379dSAlexey Brodkin break; 233e4f2379dSAlexey Brodkin 234e4f2379dSAlexey Brodkin /* Make a note that we saw a packet at this BD. 235e4f2379dSAlexey Brodkin * So next time, driver starts from this + 1 236e4f2379dSAlexey Brodkin */ 237e4f2379dSAlexey Brodkin *last_rx_bd = (*last_rx_bd + 1) % RX_BD_NUM; 238e4f2379dSAlexey Brodkin 239e4f2379dSAlexey Brodkin if (unlikely((info & FIRST_OR_LAST_MASK) != 240e4f2379dSAlexey Brodkin FIRST_OR_LAST_MASK)) { 241e4f2379dSAlexey Brodkin /* We pre-allocate buffers of MTU size so incoming 242e4f2379dSAlexey Brodkin * packets won't be split/chained. 243e4f2379dSAlexey Brodkin */ 244e4f2379dSAlexey Brodkin if (net_ratelimit()) 245e4f2379dSAlexey Brodkin netdev_err(ndev, "incomplete packet received\n"); 246e4f2379dSAlexey Brodkin 247e4f2379dSAlexey Brodkin /* Return ownership to EMAC */ 248a4a1139bSAlexey Brodkin rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE); 249e4f2379dSAlexey Brodkin stats->rx_errors++; 250e4f2379dSAlexey Brodkin stats->rx_length_errors++; 251e4f2379dSAlexey Brodkin continue; 252e4f2379dSAlexey Brodkin } 253e4f2379dSAlexey Brodkin 254e4f2379dSAlexey Brodkin pktlen = info & LEN_MASK; 255e4f2379dSAlexey Brodkin stats->rx_packets++; 256e4f2379dSAlexey Brodkin stats->rx_bytes += pktlen; 257e4f2379dSAlexey Brodkin skb = rx_buff->skb; 258e4f2379dSAlexey Brodkin skb_put(skb, pktlen); 259e4f2379dSAlexey Brodkin skb->dev = ndev; 260e4f2379dSAlexey Brodkin skb->protocol = eth_type_trans(skb, ndev); 261e4f2379dSAlexey Brodkin 262a4a1139bSAlexey Brodkin dma_unmap_single(&ndev->dev, dma_unmap_addr(rx_buff, addr), 263a4a1139bSAlexey Brodkin dma_unmap_len(rx_buff, len), DMA_FROM_DEVICE); 264e4f2379dSAlexey Brodkin 265e4f2379dSAlexey Brodkin /* Prepare the BD for next cycle */ 266a4a1139bSAlexey Brodkin rx_buff->skb = netdev_alloc_skb_ip_align(ndev, 267a4a1139bSAlexey Brodkin EMAC_BUFFER_SIZE); 268e4f2379dSAlexey Brodkin if (unlikely(!rx_buff->skb)) { 269e4f2379dSAlexey Brodkin stats->rx_errors++; 270e4f2379dSAlexey Brodkin /* Because receive_skb is below, increment rx_dropped */ 271e4f2379dSAlexey Brodkin stats->rx_dropped++; 272e4f2379dSAlexey Brodkin continue; 273e4f2379dSAlexey Brodkin } 274e4f2379dSAlexey Brodkin 275e4f2379dSAlexey Brodkin /* receive_skb only if new skb was allocated to avoid holes */ 276e4f2379dSAlexey Brodkin netif_receive_skb(skb); 277e4f2379dSAlexey Brodkin 278e4f2379dSAlexey Brodkin addr = dma_map_single(&ndev->dev, (void *)rx_buff->skb->data, 279a4a1139bSAlexey Brodkin EMAC_BUFFER_SIZE, DMA_FROM_DEVICE); 280e4f2379dSAlexey Brodkin if (dma_mapping_error(&ndev->dev, addr)) { 281e4f2379dSAlexey Brodkin if (net_ratelimit()) 282e4f2379dSAlexey Brodkin netdev_err(ndev, "cannot dma map\n"); 283e4f2379dSAlexey Brodkin dev_kfree_skb(rx_buff->skb); 284e4f2379dSAlexey Brodkin stats->rx_errors++; 285e4f2379dSAlexey Brodkin continue; 286e4f2379dSAlexey Brodkin } 287a4a1139bSAlexey Brodkin dma_unmap_addr_set(rx_buff, addr, addr); 288a4a1139bSAlexey Brodkin dma_unmap_len_set(rx_buff, len, EMAC_BUFFER_SIZE); 289e4f2379dSAlexey Brodkin 290a4a1139bSAlexey Brodkin rxbd->data = cpu_to_le32(addr); 291e4f2379dSAlexey Brodkin 292e4f2379dSAlexey Brodkin /* Make sure pointer to data buffer is set */ 293e4f2379dSAlexey Brodkin wmb(); 294e4f2379dSAlexey Brodkin 295e4f2379dSAlexey Brodkin /* Return ownership to EMAC */ 296a4a1139bSAlexey Brodkin rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE); 297e4f2379dSAlexey Brodkin } 298e4f2379dSAlexey Brodkin 299e4f2379dSAlexey Brodkin return work_done; 300e4f2379dSAlexey Brodkin } 301e4f2379dSAlexey Brodkin 302e4f2379dSAlexey Brodkin /** 303e4f2379dSAlexey Brodkin * arc_emac_poll - NAPI poll handler. 304e4f2379dSAlexey Brodkin * @napi: Pointer to napi_struct structure. 305e4f2379dSAlexey Brodkin * @budget: How many BDs to process on 1 call. 306e4f2379dSAlexey Brodkin * 307e4f2379dSAlexey Brodkin * returns: Number of processed BDs 308e4f2379dSAlexey Brodkin */ 309e4f2379dSAlexey Brodkin static int arc_emac_poll(struct napi_struct *napi, int budget) 310e4f2379dSAlexey Brodkin { 311e4f2379dSAlexey Brodkin struct net_device *ndev = napi->dev; 312e4f2379dSAlexey Brodkin struct arc_emac_priv *priv = netdev_priv(ndev); 313e4f2379dSAlexey Brodkin unsigned int work_done; 314e4f2379dSAlexey Brodkin 315e4f2379dSAlexey Brodkin arc_emac_tx_clean(ndev); 316e4f2379dSAlexey Brodkin 317e4f2379dSAlexey Brodkin work_done = arc_emac_rx(ndev, budget); 318e4f2379dSAlexey Brodkin if (work_done < budget) { 319e4f2379dSAlexey Brodkin napi_complete(napi); 3207ce7679dSBeniamino Galvani arc_reg_or(priv, R_ENABLE, RXINT_MASK | TXINT_MASK); 321e4f2379dSAlexey Brodkin } 322e4f2379dSAlexey Brodkin 323e4f2379dSAlexey Brodkin return work_done; 324e4f2379dSAlexey Brodkin } 325e4f2379dSAlexey Brodkin 326e4f2379dSAlexey Brodkin /** 327e4f2379dSAlexey Brodkin * arc_emac_intr - Global interrupt handler for EMAC. 328e4f2379dSAlexey Brodkin * @irq: irq number. 329e4f2379dSAlexey Brodkin * @dev_instance: device instance. 330e4f2379dSAlexey Brodkin * 331e4f2379dSAlexey Brodkin * returns: IRQ_HANDLED for all cases. 332e4f2379dSAlexey Brodkin * 333e4f2379dSAlexey Brodkin * ARC EMAC has only 1 interrupt line, and depending on bits raised in 334e4f2379dSAlexey Brodkin * STATUS register we may tell what is a reason for interrupt to fire. 335e4f2379dSAlexey Brodkin */ 336e4f2379dSAlexey Brodkin static irqreturn_t arc_emac_intr(int irq, void *dev_instance) 337e4f2379dSAlexey Brodkin { 338e4f2379dSAlexey Brodkin struct net_device *ndev = dev_instance; 339e4f2379dSAlexey Brodkin struct arc_emac_priv *priv = netdev_priv(ndev); 340ff458f6fSTobias Klauser struct net_device_stats *stats = &ndev->stats; 341e4f2379dSAlexey Brodkin unsigned int status; 342e4f2379dSAlexey Brodkin 343e4f2379dSAlexey Brodkin status = arc_reg_get(priv, R_STATUS); 344e4f2379dSAlexey Brodkin status &= ~MDIO_MASK; 345e4f2379dSAlexey Brodkin 346e4f2379dSAlexey Brodkin /* Reset all flags except "MDIO complete" */ 347e4f2379dSAlexey Brodkin arc_reg_set(priv, R_STATUS, status); 348e4f2379dSAlexey Brodkin 3497ce7679dSBeniamino Galvani if (status & (RXINT_MASK | TXINT_MASK)) { 350e4f2379dSAlexey Brodkin if (likely(napi_schedule_prep(&priv->napi))) { 3517ce7679dSBeniamino Galvani arc_reg_clr(priv, R_ENABLE, RXINT_MASK | TXINT_MASK); 352e4f2379dSAlexey Brodkin __napi_schedule(&priv->napi); 353e4f2379dSAlexey Brodkin } 354e4f2379dSAlexey Brodkin } 355e4f2379dSAlexey Brodkin 356e4f2379dSAlexey Brodkin if (status & ERR_MASK) { 357e4f2379dSAlexey Brodkin /* MSER/RXCR/RXFR/RXFL interrupt fires on corresponding 358e4f2379dSAlexey Brodkin * 8-bit error counter overrun. 359e4f2379dSAlexey Brodkin */ 360e4f2379dSAlexey Brodkin 361e4f2379dSAlexey Brodkin if (status & MSER_MASK) { 362e4f2379dSAlexey Brodkin stats->rx_missed_errors += 0x100; 363e4f2379dSAlexey Brodkin stats->rx_errors += 0x100; 364e4f2379dSAlexey Brodkin } 365e4f2379dSAlexey Brodkin 366e4f2379dSAlexey Brodkin if (status & RXCR_MASK) { 367e4f2379dSAlexey Brodkin stats->rx_crc_errors += 0x100; 368e4f2379dSAlexey Brodkin stats->rx_errors += 0x100; 369e4f2379dSAlexey Brodkin } 370e4f2379dSAlexey Brodkin 371e4f2379dSAlexey Brodkin if (status & RXFR_MASK) { 372e4f2379dSAlexey Brodkin stats->rx_frame_errors += 0x100; 373e4f2379dSAlexey Brodkin stats->rx_errors += 0x100; 374e4f2379dSAlexey Brodkin } 375e4f2379dSAlexey Brodkin 376e4f2379dSAlexey Brodkin if (status & RXFL_MASK) { 377e4f2379dSAlexey Brodkin stats->rx_over_errors += 0x100; 378e4f2379dSAlexey Brodkin stats->rx_errors += 0x100; 379e4f2379dSAlexey Brodkin } 380e4f2379dSAlexey Brodkin } 381e4f2379dSAlexey Brodkin 382e4f2379dSAlexey Brodkin return IRQ_HANDLED; 383e4f2379dSAlexey Brodkin } 384e4f2379dSAlexey Brodkin 3855a45e57aSBeniamino Galvani #ifdef CONFIG_NET_POLL_CONTROLLER 3865a45e57aSBeniamino Galvani static void arc_emac_poll_controller(struct net_device *dev) 3875a45e57aSBeniamino Galvani { 3885a45e57aSBeniamino Galvani disable_irq(dev->irq); 3895a45e57aSBeniamino Galvani arc_emac_intr(dev->irq, dev); 3905a45e57aSBeniamino Galvani enable_irq(dev->irq); 3915a45e57aSBeniamino Galvani } 3925a45e57aSBeniamino Galvani #endif 3935a45e57aSBeniamino Galvani 394e4f2379dSAlexey Brodkin /** 395e4f2379dSAlexey Brodkin * arc_emac_open - Open the network device. 396e4f2379dSAlexey Brodkin * @ndev: Pointer to the network device. 397e4f2379dSAlexey Brodkin * 398e4f2379dSAlexey Brodkin * returns: 0, on success or non-zero error value on failure. 399e4f2379dSAlexey Brodkin * 400e4f2379dSAlexey Brodkin * This function sets the MAC address, requests and enables an IRQ 401e4f2379dSAlexey Brodkin * for the EMAC device and starts the Tx queue. 402e4f2379dSAlexey Brodkin * It also connects to the phy device. 403e4f2379dSAlexey Brodkin */ 404e4f2379dSAlexey Brodkin static int arc_emac_open(struct net_device *ndev) 405e4f2379dSAlexey Brodkin { 406e4f2379dSAlexey Brodkin struct arc_emac_priv *priv = netdev_priv(ndev); 407e4f2379dSAlexey Brodkin struct phy_device *phy_dev = priv->phy_dev; 408e4f2379dSAlexey Brodkin int i; 409e4f2379dSAlexey Brodkin 410e4f2379dSAlexey Brodkin phy_dev->autoneg = AUTONEG_ENABLE; 411e4f2379dSAlexey Brodkin phy_dev->speed = 0; 412e4f2379dSAlexey Brodkin phy_dev->duplex = 0; 413b0ac9564SFlorian Fainelli phy_dev->advertising &= phy_dev->supported; 414e4f2379dSAlexey Brodkin 415a4a1139bSAlexey Brodkin priv->last_rx_bd = 0; 416a4a1139bSAlexey Brodkin 417e4f2379dSAlexey Brodkin /* Allocate and set buffers for Rx BD's */ 418e4f2379dSAlexey Brodkin for (i = 0; i < RX_BD_NUM; i++) { 419a4a1139bSAlexey Brodkin dma_addr_t addr; 420a4a1139bSAlexey Brodkin unsigned int *last_rx_bd = &priv->last_rx_bd; 421a4a1139bSAlexey Brodkin struct arc_emac_bd *rxbd = &priv->rxbd[*last_rx_bd]; 422a4a1139bSAlexey Brodkin struct buffer_state *rx_buff = &priv->rx_buff[*last_rx_bd]; 423a4a1139bSAlexey Brodkin 424a4a1139bSAlexey Brodkin rx_buff->skb = netdev_alloc_skb_ip_align(ndev, 425a4a1139bSAlexey Brodkin EMAC_BUFFER_SIZE); 426a4a1139bSAlexey Brodkin if (unlikely(!rx_buff->skb)) 427e4f2379dSAlexey Brodkin return -ENOMEM; 428e4f2379dSAlexey Brodkin 429a4a1139bSAlexey Brodkin addr = dma_map_single(&ndev->dev, (void *)rx_buff->skb->data, 430a4a1139bSAlexey Brodkin EMAC_BUFFER_SIZE, DMA_FROM_DEVICE); 431a4a1139bSAlexey Brodkin if (dma_mapping_error(&ndev->dev, addr)) { 432a4a1139bSAlexey Brodkin netdev_err(ndev, "cannot dma map\n"); 433a4a1139bSAlexey Brodkin dev_kfree_skb(rx_buff->skb); 434a4a1139bSAlexey Brodkin return -ENOMEM; 435a4a1139bSAlexey Brodkin } 436a4a1139bSAlexey Brodkin dma_unmap_addr_set(rx_buff, addr, addr); 437a4a1139bSAlexey Brodkin dma_unmap_len_set(rx_buff, len, EMAC_BUFFER_SIZE); 438a4a1139bSAlexey Brodkin 439a4a1139bSAlexey Brodkin rxbd->data = cpu_to_le32(addr); 440e4f2379dSAlexey Brodkin 441e4f2379dSAlexey Brodkin /* Make sure pointer to data buffer is set */ 442e4f2379dSAlexey Brodkin wmb(); 443e4f2379dSAlexey Brodkin 444a4a1139bSAlexey Brodkin /* Return ownership to EMAC */ 445a4a1139bSAlexey Brodkin rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE); 446e4f2379dSAlexey Brodkin 447a4a1139bSAlexey Brodkin *last_rx_bd = (*last_rx_bd + 1) % RX_BD_NUM; 448a4a1139bSAlexey Brodkin } 449e4f2379dSAlexey Brodkin 450e4f2379dSAlexey Brodkin /* Clean Tx BD's */ 451e4f2379dSAlexey Brodkin memset(priv->txbd, 0, TX_RING_SZ); 452e4f2379dSAlexey Brodkin 453e4f2379dSAlexey Brodkin /* Initialize logical address filter */ 454e4f2379dSAlexey Brodkin arc_reg_set(priv, R_LAFL, 0); 455e4f2379dSAlexey Brodkin arc_reg_set(priv, R_LAFH, 0); 456e4f2379dSAlexey Brodkin 457e4f2379dSAlexey Brodkin /* Set BD ring pointers for device side */ 458e4f2379dSAlexey Brodkin arc_reg_set(priv, R_RX_RING, (unsigned int)priv->rxbd_dma); 459e4f2379dSAlexey Brodkin arc_reg_set(priv, R_TX_RING, (unsigned int)priv->txbd_dma); 460e4f2379dSAlexey Brodkin 461e4f2379dSAlexey Brodkin /* Enable interrupts */ 4627ce7679dSBeniamino Galvani arc_reg_set(priv, R_ENABLE, RXINT_MASK | TXINT_MASK | ERR_MASK); 463e4f2379dSAlexey Brodkin 464e4f2379dSAlexey Brodkin /* Set CONTROL */ 465e4f2379dSAlexey Brodkin arc_reg_set(priv, R_CTRL, 466e4f2379dSAlexey Brodkin (RX_BD_NUM << 24) | /* RX BD table length */ 467e4f2379dSAlexey Brodkin (TX_BD_NUM << 16) | /* TX BD table length */ 468e4f2379dSAlexey Brodkin TXRN_MASK | RXRN_MASK); 469e4f2379dSAlexey Brodkin 470e4f2379dSAlexey Brodkin napi_enable(&priv->napi); 471e4f2379dSAlexey Brodkin 472e4f2379dSAlexey Brodkin /* Enable EMAC */ 473e4f2379dSAlexey Brodkin arc_reg_or(priv, R_CTRL, EN_MASK); 474e4f2379dSAlexey Brodkin 475e4f2379dSAlexey Brodkin phy_start_aneg(priv->phy_dev); 476e4f2379dSAlexey Brodkin 477e4f2379dSAlexey Brodkin netif_start_queue(ndev); 478e4f2379dSAlexey Brodkin 479e4f2379dSAlexey Brodkin return 0; 480e4f2379dSAlexey Brodkin } 481e4f2379dSAlexey Brodkin 482e4f2379dSAlexey Brodkin /** 483775dd682SBeniamino Galvani * arc_emac_set_rx_mode - Change the receive filtering mode. 484775dd682SBeniamino Galvani * @ndev: Pointer to the network device. 485775dd682SBeniamino Galvani * 486775dd682SBeniamino Galvani * This function enables/disables promiscuous or all-multicast mode 487775dd682SBeniamino Galvani * and updates the multicast filtering list of the network device. 488775dd682SBeniamino Galvani */ 489775dd682SBeniamino Galvani static void arc_emac_set_rx_mode(struct net_device *ndev) 490775dd682SBeniamino Galvani { 491775dd682SBeniamino Galvani struct arc_emac_priv *priv = netdev_priv(ndev); 492775dd682SBeniamino Galvani 493775dd682SBeniamino Galvani if (ndev->flags & IFF_PROMISC) { 494775dd682SBeniamino Galvani arc_reg_or(priv, R_CTRL, PROM_MASK); 495775dd682SBeniamino Galvani } else { 496775dd682SBeniamino Galvani arc_reg_clr(priv, R_CTRL, PROM_MASK); 497775dd682SBeniamino Galvani 498775dd682SBeniamino Galvani if (ndev->flags & IFF_ALLMULTI) { 499775dd682SBeniamino Galvani arc_reg_set(priv, R_LAFL, ~0); 500775dd682SBeniamino Galvani arc_reg_set(priv, R_LAFH, ~0); 501775dd682SBeniamino Galvani } else { 502775dd682SBeniamino Galvani struct netdev_hw_addr *ha; 503775dd682SBeniamino Galvani unsigned int filter[2] = { 0, 0 }; 504775dd682SBeniamino Galvani int bit; 505775dd682SBeniamino Galvani 506775dd682SBeniamino Galvani netdev_for_each_mc_addr(ha, ndev) { 507775dd682SBeniamino Galvani bit = ether_crc_le(ETH_ALEN, ha->addr) >> 26; 508775dd682SBeniamino Galvani filter[bit >> 5] |= 1 << (bit & 31); 509775dd682SBeniamino Galvani } 510775dd682SBeniamino Galvani 511775dd682SBeniamino Galvani arc_reg_set(priv, R_LAFL, filter[0]); 512775dd682SBeniamino Galvani arc_reg_set(priv, R_LAFH, filter[1]); 513775dd682SBeniamino Galvani } 514775dd682SBeniamino Galvani } 515775dd682SBeniamino Galvani } 516775dd682SBeniamino Galvani 517775dd682SBeniamino Galvani /** 518e4f2379dSAlexey Brodkin * arc_emac_stop - Close the network device. 519e4f2379dSAlexey Brodkin * @ndev: Pointer to the network device. 520e4f2379dSAlexey Brodkin * 521e4f2379dSAlexey Brodkin * This function stops the Tx queue, disables interrupts and frees the IRQ for 522e4f2379dSAlexey Brodkin * the EMAC device. 523e4f2379dSAlexey Brodkin * It also disconnects the PHY device associated with the EMAC device. 524e4f2379dSAlexey Brodkin */ 525e4f2379dSAlexey Brodkin static int arc_emac_stop(struct net_device *ndev) 526e4f2379dSAlexey Brodkin { 527e4f2379dSAlexey Brodkin struct arc_emac_priv *priv = netdev_priv(ndev); 528e4f2379dSAlexey Brodkin 529e4f2379dSAlexey Brodkin napi_disable(&priv->napi); 530e4f2379dSAlexey Brodkin netif_stop_queue(ndev); 531e4f2379dSAlexey Brodkin 532e4f2379dSAlexey Brodkin /* Disable interrupts */ 5337ce7679dSBeniamino Galvani arc_reg_clr(priv, R_ENABLE, RXINT_MASK | TXINT_MASK | ERR_MASK); 534e4f2379dSAlexey Brodkin 535e4f2379dSAlexey Brodkin /* Disable EMAC */ 536e4f2379dSAlexey Brodkin arc_reg_clr(priv, R_CTRL, EN_MASK); 537e4f2379dSAlexey Brodkin 538e4f2379dSAlexey Brodkin return 0; 539e4f2379dSAlexey Brodkin } 540e4f2379dSAlexey Brodkin 541e4f2379dSAlexey Brodkin /** 542e4f2379dSAlexey Brodkin * arc_emac_stats - Get system network statistics. 543e4f2379dSAlexey Brodkin * @ndev: Pointer to net_device structure. 544e4f2379dSAlexey Brodkin * 545e4f2379dSAlexey Brodkin * Returns the address of the device statistics structure. 546e4f2379dSAlexey Brodkin * Statistics are updated in interrupt handler. 547e4f2379dSAlexey Brodkin */ 548e4f2379dSAlexey Brodkin static struct net_device_stats *arc_emac_stats(struct net_device *ndev) 549e4f2379dSAlexey Brodkin { 550e4f2379dSAlexey Brodkin struct arc_emac_priv *priv = netdev_priv(ndev); 551ff458f6fSTobias Klauser struct net_device_stats *stats = &ndev->stats; 552e4f2379dSAlexey Brodkin unsigned long miss, rxerr; 553e4f2379dSAlexey Brodkin u8 rxcrc, rxfram, rxoflow; 554e4f2379dSAlexey Brodkin 555e4f2379dSAlexey Brodkin rxerr = arc_reg_get(priv, R_RXERR); 556e4f2379dSAlexey Brodkin miss = arc_reg_get(priv, R_MISS); 557e4f2379dSAlexey Brodkin 558e4f2379dSAlexey Brodkin rxcrc = rxerr; 559e4f2379dSAlexey Brodkin rxfram = rxerr >> 8; 560e4f2379dSAlexey Brodkin rxoflow = rxerr >> 16; 561e4f2379dSAlexey Brodkin 562e4f2379dSAlexey Brodkin stats->rx_errors += miss; 563e4f2379dSAlexey Brodkin stats->rx_errors += rxcrc + rxfram + rxoflow; 564e4f2379dSAlexey Brodkin 565e4f2379dSAlexey Brodkin stats->rx_over_errors += rxoflow; 566e4f2379dSAlexey Brodkin stats->rx_frame_errors += rxfram; 567e4f2379dSAlexey Brodkin stats->rx_crc_errors += rxcrc; 568e4f2379dSAlexey Brodkin stats->rx_missed_errors += miss; 569e4f2379dSAlexey Brodkin 570e4f2379dSAlexey Brodkin return stats; 571e4f2379dSAlexey Brodkin } 572e4f2379dSAlexey Brodkin 573e4f2379dSAlexey Brodkin /** 574e4f2379dSAlexey Brodkin * arc_emac_tx - Starts the data transmission. 575e4f2379dSAlexey Brodkin * @skb: sk_buff pointer that contains data to be Transmitted. 576e4f2379dSAlexey Brodkin * @ndev: Pointer to net_device structure. 577e4f2379dSAlexey Brodkin * 578e4f2379dSAlexey Brodkin * returns: NETDEV_TX_OK, on success 579e4f2379dSAlexey Brodkin * NETDEV_TX_BUSY, if any of the descriptors are not free. 580e4f2379dSAlexey Brodkin * 581e4f2379dSAlexey Brodkin * This function is invoked from upper layers to initiate transmission. 582e4f2379dSAlexey Brodkin */ 583e4f2379dSAlexey Brodkin static int arc_emac_tx(struct sk_buff *skb, struct net_device *ndev) 584e4f2379dSAlexey Brodkin { 585e4f2379dSAlexey Brodkin struct arc_emac_priv *priv = netdev_priv(ndev); 586e4f2379dSAlexey Brodkin unsigned int len, *txbd_curr = &priv->txbd_curr; 587ff458f6fSTobias Klauser struct net_device_stats *stats = &ndev->stats; 588e4f2379dSAlexey Brodkin __le32 *info = &priv->txbd[*txbd_curr].info; 589e4f2379dSAlexey Brodkin dma_addr_t addr; 590e4f2379dSAlexey Brodkin 591e4f2379dSAlexey Brodkin if (skb_padto(skb, ETH_ZLEN)) 592e4f2379dSAlexey Brodkin return NETDEV_TX_OK; 593e4f2379dSAlexey Brodkin 594e4f2379dSAlexey Brodkin len = max_t(unsigned int, ETH_ZLEN, skb->len); 595e4f2379dSAlexey Brodkin 59674dd40bcSBeniamino Galvani if (unlikely(!arc_emac_tx_avail(priv))) { 597e4f2379dSAlexey Brodkin netif_stop_queue(ndev); 59874dd40bcSBeniamino Galvani netdev_err(ndev, "BUG! Tx Ring full when queue awake!\n"); 599e4f2379dSAlexey Brodkin return NETDEV_TX_BUSY; 600e4f2379dSAlexey Brodkin } 601e4f2379dSAlexey Brodkin 602e4f2379dSAlexey Brodkin addr = dma_map_single(&ndev->dev, (void *)skb->data, len, 603e4f2379dSAlexey Brodkin DMA_TO_DEVICE); 604e4f2379dSAlexey Brodkin 605e4f2379dSAlexey Brodkin if (unlikely(dma_mapping_error(&ndev->dev, addr))) { 606e4f2379dSAlexey Brodkin stats->tx_dropped++; 607e4f2379dSAlexey Brodkin stats->tx_errors++; 608e4f2379dSAlexey Brodkin dev_kfree_skb(skb); 609e4f2379dSAlexey Brodkin return NETDEV_TX_OK; 610e4f2379dSAlexey Brodkin } 611a4a1139bSAlexey Brodkin dma_unmap_addr_set(&priv->tx_buff[*txbd_curr], addr, addr); 612e4f2379dSAlexey Brodkin dma_unmap_len_set(&priv->tx_buff[*txbd_curr], len, len); 613e4f2379dSAlexey Brodkin 614a4a1139bSAlexey Brodkin priv->txbd[*txbd_curr].data = cpu_to_le32(addr); 615e4f2379dSAlexey Brodkin 616e4f2379dSAlexey Brodkin /* Make sure pointer to data buffer is set */ 617e4f2379dSAlexey Brodkin wmb(); 618e4f2379dSAlexey Brodkin 61937ec274eSEric Dumazet skb_tx_timestamp(skb); 62037ec274eSEric Dumazet 621e4f2379dSAlexey Brodkin *info = cpu_to_le32(FOR_EMAC | FIRST_OR_LAST_MASK | len); 622e4f2379dSAlexey Brodkin 623c278c253SAlexander Kochetkov /* Make sure info word is set */ 624c278c253SAlexander Kochetkov wmb(); 625c278c253SAlexander Kochetkov 626c278c253SAlexander Kochetkov priv->tx_buff[*txbd_curr].skb = skb; 627c278c253SAlexander Kochetkov 628e4f2379dSAlexey Brodkin /* Increment index to point to the next BD */ 629e4f2379dSAlexey Brodkin *txbd_curr = (*txbd_curr + 1) % TX_BD_NUM; 630e4f2379dSAlexey Brodkin 63174dd40bcSBeniamino Galvani /* Ensure that tx_clean() sees the new txbd_curr before 63274dd40bcSBeniamino Galvani * checking the queue status. This prevents an unneeded wake 63374dd40bcSBeniamino Galvani * of the queue in tx_clean(). 63474dd40bcSBeniamino Galvani */ 63574dd40bcSBeniamino Galvani smp_mb(); 636e4f2379dSAlexey Brodkin 63774dd40bcSBeniamino Galvani if (!arc_emac_tx_avail(priv)) { 638e4f2379dSAlexey Brodkin netif_stop_queue(ndev); 63974dd40bcSBeniamino Galvani /* Refresh tx_dirty */ 64074dd40bcSBeniamino Galvani smp_mb(); 64174dd40bcSBeniamino Galvani if (arc_emac_tx_avail(priv)) 64274dd40bcSBeniamino Galvani netif_start_queue(ndev); 64374dd40bcSBeniamino Galvani } 644e4f2379dSAlexey Brodkin 645e4f2379dSAlexey Brodkin arc_reg_set(priv, R_STATUS, TXPL_MASK); 646e4f2379dSAlexey Brodkin 647e4f2379dSAlexey Brodkin return NETDEV_TX_OK; 648e4f2379dSAlexey Brodkin } 649e4f2379dSAlexey Brodkin 650235a251aSMax Schwarz static void arc_emac_set_address_internal(struct net_device *ndev) 651235a251aSMax Schwarz { 652235a251aSMax Schwarz struct arc_emac_priv *priv = netdev_priv(ndev); 653235a251aSMax Schwarz unsigned int addr_low, addr_hi; 654235a251aSMax Schwarz 655235a251aSMax Schwarz addr_low = le32_to_cpu(*(__le32 *) &ndev->dev_addr[0]); 656235a251aSMax Schwarz addr_hi = le16_to_cpu(*(__le16 *) &ndev->dev_addr[4]); 657235a251aSMax Schwarz 658235a251aSMax Schwarz arc_reg_set(priv, R_ADDRL, addr_low); 659235a251aSMax Schwarz arc_reg_set(priv, R_ADDRH, addr_hi); 660235a251aSMax Schwarz } 661235a251aSMax Schwarz 662e4f2379dSAlexey Brodkin /** 663e4f2379dSAlexey Brodkin * arc_emac_set_address - Set the MAC address for this device. 664e4f2379dSAlexey Brodkin * @ndev: Pointer to net_device structure. 665e4f2379dSAlexey Brodkin * @p: 6 byte Address to be written as MAC address. 666e4f2379dSAlexey Brodkin * 667e4f2379dSAlexey Brodkin * This function copies the HW address from the sockaddr structure to the 668e4f2379dSAlexey Brodkin * net_device structure and updates the address in HW. 669e4f2379dSAlexey Brodkin * 670e4f2379dSAlexey Brodkin * returns: -EBUSY if the net device is busy or 0 if the address is set 671e4f2379dSAlexey Brodkin * successfully. 672e4f2379dSAlexey Brodkin */ 673e4f2379dSAlexey Brodkin static int arc_emac_set_address(struct net_device *ndev, void *p) 674e4f2379dSAlexey Brodkin { 675e4f2379dSAlexey Brodkin struct sockaddr *addr = p; 676e4f2379dSAlexey Brodkin 677e4f2379dSAlexey Brodkin if (netif_running(ndev)) 678e4f2379dSAlexey Brodkin return -EBUSY; 679e4f2379dSAlexey Brodkin 680e4f2379dSAlexey Brodkin if (!is_valid_ether_addr(addr->sa_data)) 681e4f2379dSAlexey Brodkin return -EADDRNOTAVAIL; 682e4f2379dSAlexey Brodkin 683e4f2379dSAlexey Brodkin memcpy(ndev->dev_addr, addr->sa_data, ndev->addr_len); 684e4f2379dSAlexey Brodkin 685235a251aSMax Schwarz arc_emac_set_address_internal(ndev); 686e4f2379dSAlexey Brodkin 687e4f2379dSAlexey Brodkin return 0; 688e4f2379dSAlexey Brodkin } 689e4f2379dSAlexey Brodkin 690e4f2379dSAlexey Brodkin static const struct net_device_ops arc_emac_netdev_ops = { 691e4f2379dSAlexey Brodkin .ndo_open = arc_emac_open, 692e4f2379dSAlexey Brodkin .ndo_stop = arc_emac_stop, 693e4f2379dSAlexey Brodkin .ndo_start_xmit = arc_emac_tx, 694e4f2379dSAlexey Brodkin .ndo_set_mac_address = arc_emac_set_address, 695e4f2379dSAlexey Brodkin .ndo_get_stats = arc_emac_stats, 696775dd682SBeniamino Galvani .ndo_set_rx_mode = arc_emac_set_rx_mode, 6975a45e57aSBeniamino Galvani #ifdef CONFIG_NET_POLL_CONTROLLER 6985a45e57aSBeniamino Galvani .ndo_poll_controller = arc_emac_poll_controller, 6995a45e57aSBeniamino Galvani #endif 700e4f2379dSAlexey Brodkin }; 701e4f2379dSAlexey Brodkin 70223d2d9a6SRomain Perier int arc_emac_probe(struct net_device *ndev, int interface) 703e4f2379dSAlexey Brodkin { 70423d2d9a6SRomain Perier struct device *dev = ndev->dev.parent; 705f7578496SThierry Reding struct resource res_regs; 706e4f2379dSAlexey Brodkin struct device_node *phy_node; 707e4f2379dSAlexey Brodkin struct arc_emac_priv *priv; 708e4f2379dSAlexey Brodkin const char *mac_addr; 709f7578496SThierry Reding unsigned int id, clock_frequency, irq; 710e4f2379dSAlexey Brodkin int err; 711e4f2379dSAlexey Brodkin 712e4f2379dSAlexey Brodkin 713e4f2379dSAlexey Brodkin /* Get PHY from device tree */ 714f15f44e0SRomain Perier phy_node = of_parse_phandle(dev->of_node, "phy", 0); 715e4f2379dSAlexey Brodkin if (!phy_node) { 716f15f44e0SRomain Perier dev_err(dev, "failed to retrieve phy description from device tree\n"); 717e4f2379dSAlexey Brodkin return -ENODEV; 718e4f2379dSAlexey Brodkin } 719e4f2379dSAlexey Brodkin 720e4f2379dSAlexey Brodkin /* Get EMAC registers base address from device tree */ 721f15f44e0SRomain Perier err = of_address_to_resource(dev->of_node, 0, &res_regs); 722e4f2379dSAlexey Brodkin if (err) { 723f15f44e0SRomain Perier dev_err(dev, "failed to retrieve registers base from device tree\n"); 724e4f2379dSAlexey Brodkin return -ENODEV; 725e4f2379dSAlexey Brodkin } 726e4f2379dSAlexey Brodkin 727e4f2379dSAlexey Brodkin /* Get IRQ from device tree */ 728f15f44e0SRomain Perier irq = irq_of_parse_and_map(dev->of_node, 0); 729f7578496SThierry Reding if (!irq) { 730f15f44e0SRomain Perier dev_err(dev, "failed to retrieve <irq> value from device tree\n"); 731e4f2379dSAlexey Brodkin return -ENODEV; 732e4f2379dSAlexey Brodkin } 733e4f2379dSAlexey Brodkin 734e4f2379dSAlexey Brodkin 735e4f2379dSAlexey Brodkin ndev->netdev_ops = &arc_emac_netdev_ops; 736e4f2379dSAlexey Brodkin ndev->ethtool_ops = &arc_emac_ethtool_ops; 737e4f2379dSAlexey Brodkin ndev->watchdog_timeo = TX_TIMEOUT; 738e4f2379dSAlexey Brodkin /* FIXME :: no multicast support yet */ 739e4f2379dSAlexey Brodkin ndev->flags &= ~IFF_MULTICAST; 740e4f2379dSAlexey Brodkin 741e4f2379dSAlexey Brodkin priv = netdev_priv(ndev); 742f15f44e0SRomain Perier priv->dev = dev; 743e4f2379dSAlexey Brodkin 744f15f44e0SRomain Perier priv->regs = devm_ioremap_resource(dev, &res_regs); 745e4f2379dSAlexey Brodkin if (IS_ERR(priv->regs)) { 74623d2d9a6SRomain Perier return PTR_ERR(priv->regs); 747e4f2379dSAlexey Brodkin } 748f15f44e0SRomain Perier dev_dbg(dev, "Registers base address is 0x%p\n", priv->regs); 749e4f2379dSAlexey Brodkin 75023d2d9a6SRomain Perier if (priv->clk) { 75123d2d9a6SRomain Perier err = clk_prepare_enable(priv->clk); 75223d2d9a6SRomain Perier if (err) { 75323d2d9a6SRomain Perier dev_err(dev, "failed to enable clock\n"); 75423d2d9a6SRomain Perier return err; 75523d2d9a6SRomain Perier } 75623d2d9a6SRomain Perier 75723d2d9a6SRomain Perier clock_frequency = clk_get_rate(priv->clk); 75823d2d9a6SRomain Perier } else { 75988154c96SHeiko Stübner /* Get CPU clock frequency from device tree */ 760f15f44e0SRomain Perier if (of_property_read_u32(dev->of_node, "clock-frequency", 76188154c96SHeiko Stübner &clock_frequency)) { 762f15f44e0SRomain Perier dev_err(dev, "failed to retrieve <clock-frequency> from device tree\n"); 76323d2d9a6SRomain Perier return -EINVAL; 76488154c96SHeiko Stübner } 76588154c96SHeiko Stübner } 76688154c96SHeiko Stübner 767e4f2379dSAlexey Brodkin id = arc_reg_get(priv, R_ID); 768e4f2379dSAlexey Brodkin 769e4f2379dSAlexey Brodkin /* Check for EMAC revision 5 or 7, magic number */ 770e4f2379dSAlexey Brodkin if (!(id == 0x0005fd02 || id == 0x0007fd02)) { 771f15f44e0SRomain Perier dev_err(dev, "ARC EMAC not detected, id=0x%x\n", id); 772e4f2379dSAlexey Brodkin err = -ENODEV; 77388154c96SHeiko Stübner goto out_clken; 774e4f2379dSAlexey Brodkin } 775f15f44e0SRomain Perier dev_info(dev, "ARC EMAC detected with id: 0x%x\n", id); 776e4f2379dSAlexey Brodkin 777e4f2379dSAlexey Brodkin /* Set poll rate so that it polls every 1 ms */ 778e4f2379dSAlexey Brodkin arc_reg_set(priv, R_POLLRATE, clock_frequency / 1000000); 779e4f2379dSAlexey Brodkin 780f7578496SThierry Reding ndev->irq = irq; 781f15f44e0SRomain Perier dev_info(dev, "IRQ is %d\n", ndev->irq); 782e4f2379dSAlexey Brodkin 783e4f2379dSAlexey Brodkin /* Register interrupt handler for device */ 784f15f44e0SRomain Perier err = devm_request_irq(dev, ndev->irq, arc_emac_intr, 0, 785e4f2379dSAlexey Brodkin ndev->name, ndev); 786e4f2379dSAlexey Brodkin if (err) { 787f15f44e0SRomain Perier dev_err(dev, "could not allocate IRQ\n"); 78888154c96SHeiko Stübner goto out_clken; 789e4f2379dSAlexey Brodkin } 790e4f2379dSAlexey Brodkin 791e4f2379dSAlexey Brodkin /* Get MAC address from device tree */ 792f15f44e0SRomain Perier mac_addr = of_get_mac_address(dev->of_node); 793e4f2379dSAlexey Brodkin 79499470819SLuka Perkov if (mac_addr) 795e4f2379dSAlexey Brodkin memcpy(ndev->dev_addr, mac_addr, ETH_ALEN); 79699470819SLuka Perkov else 79799470819SLuka Perkov eth_hw_addr_random(ndev); 798e4f2379dSAlexey Brodkin 799235a251aSMax Schwarz arc_emac_set_address_internal(ndev); 800f15f44e0SRomain Perier dev_info(dev, "MAC address is now %pM\n", ndev->dev_addr); 801e4f2379dSAlexey Brodkin 802e4f2379dSAlexey Brodkin /* Do 1 allocation instead of 2 separate ones for Rx and Tx BD rings */ 803f15f44e0SRomain Perier priv->rxbd = dmam_alloc_coherent(dev, RX_RING_SZ + TX_RING_SZ, 804e4f2379dSAlexey Brodkin &priv->rxbd_dma, GFP_KERNEL); 805e4f2379dSAlexey Brodkin 806e4f2379dSAlexey Brodkin if (!priv->rxbd) { 807f15f44e0SRomain Perier dev_err(dev, "failed to allocate data buffers\n"); 808e4f2379dSAlexey Brodkin err = -ENOMEM; 80988154c96SHeiko Stübner goto out_clken; 810e4f2379dSAlexey Brodkin } 811e4f2379dSAlexey Brodkin 812e4f2379dSAlexey Brodkin priv->txbd = priv->rxbd + RX_BD_NUM; 813e4f2379dSAlexey Brodkin 814e4f2379dSAlexey Brodkin priv->txbd_dma = priv->rxbd_dma + RX_RING_SZ; 815f15f44e0SRomain Perier dev_dbg(dev, "EMAC Device addr: Rx Ring [0x%x], Tx Ring[%x]\n", 816e4f2379dSAlexey Brodkin (unsigned int)priv->rxbd_dma, (unsigned int)priv->txbd_dma); 817e4f2379dSAlexey Brodkin 81893e91b3dSRomain Perier err = arc_mdio_probe(priv); 819e4f2379dSAlexey Brodkin if (err) { 820f15f44e0SRomain Perier dev_err(dev, "failed to probe MII bus\n"); 82188154c96SHeiko Stübner goto out_clken; 822e4f2379dSAlexey Brodkin } 823e4f2379dSAlexey Brodkin 824e4f2379dSAlexey Brodkin priv->phy_dev = of_phy_connect(ndev, phy_node, arc_emac_adjust_link, 0, 82523d2d9a6SRomain Perier interface); 826e4f2379dSAlexey Brodkin if (!priv->phy_dev) { 827f15f44e0SRomain Perier dev_err(dev, "of_phy_connect() failed\n"); 828e4f2379dSAlexey Brodkin err = -ENODEV; 829796bec1eSHeiko Stübner goto out_mdio; 830e4f2379dSAlexey Brodkin } 831e4f2379dSAlexey Brodkin 832f15f44e0SRomain Perier dev_info(dev, "connected to %s phy with id 0x%x\n", 833e4f2379dSAlexey Brodkin priv->phy_dev->drv->name, priv->phy_dev->phy_id); 834e4f2379dSAlexey Brodkin 835e4f2379dSAlexey Brodkin netif_napi_add(ndev, &priv->napi, arc_emac_poll, ARC_EMAC_NAPI_WEIGHT); 836e4f2379dSAlexey Brodkin 837e4f2379dSAlexey Brodkin err = register_netdev(ndev); 838e4f2379dSAlexey Brodkin if (err) { 839f15f44e0SRomain Perier dev_err(dev, "failed to register network device\n"); 840796bec1eSHeiko Stübner goto out_netif_api; 841e4f2379dSAlexey Brodkin } 842e4f2379dSAlexey Brodkin 843e4f2379dSAlexey Brodkin return 0; 844e4f2379dSAlexey Brodkin 845796bec1eSHeiko Stübner out_netif_api: 846796bec1eSHeiko Stübner netif_napi_del(&priv->napi); 847796bec1eSHeiko Stübner phy_disconnect(priv->phy_dev); 848796bec1eSHeiko Stübner priv->phy_dev = NULL; 849796bec1eSHeiko Stübner out_mdio: 850796bec1eSHeiko Stübner arc_mdio_remove(priv); 85188154c96SHeiko Stübner out_clken: 85223d2d9a6SRomain Perier if (priv->clk) 85388154c96SHeiko Stübner clk_disable_unprepare(priv->clk); 854e4f2379dSAlexey Brodkin return err; 855e4f2379dSAlexey Brodkin } 85623d2d9a6SRomain Perier EXPORT_SYMBOL_GPL(arc_emac_probe); 857e4f2379dSAlexey Brodkin 85823d2d9a6SRomain Perier int arc_emac_remove(struct net_device *ndev) 859e4f2379dSAlexey Brodkin { 860e4f2379dSAlexey Brodkin struct arc_emac_priv *priv = netdev_priv(ndev); 861e4f2379dSAlexey Brodkin 862e4f2379dSAlexey Brodkin phy_disconnect(priv->phy_dev); 863e4f2379dSAlexey Brodkin priv->phy_dev = NULL; 864e4f2379dSAlexey Brodkin arc_mdio_remove(priv); 865e4f2379dSAlexey Brodkin unregister_netdev(ndev); 866e4f2379dSAlexey Brodkin netif_napi_del(&priv->napi); 86788154c96SHeiko Stübner 86888154c96SHeiko Stübner if (!IS_ERR(priv->clk)) { 86988154c96SHeiko Stübner clk_disable_unprepare(priv->clk); 87088154c96SHeiko Stübner } 87188154c96SHeiko Stübner 872e4f2379dSAlexey Brodkin 873e4f2379dSAlexey Brodkin return 0; 874e4f2379dSAlexey Brodkin } 87523d2d9a6SRomain Perier EXPORT_SYMBOL_GPL(arc_emac_remove); 876e4f2379dSAlexey Brodkin 877e4f2379dSAlexey Brodkin MODULE_AUTHOR("Alexey Brodkin <abrodkin@synopsys.com>"); 878e4f2379dSAlexey Brodkin MODULE_DESCRIPTION("ARC EMAC driver"); 879e4f2379dSAlexey Brodkin MODULE_LICENSE("GPL"); 880