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 /** 3074dd40bcSBeniamino Galvani * arc_emac_tx_avail - Return the number of available slots in the tx ring. 3174dd40bcSBeniamino Galvani * @priv: Pointer to ARC EMAC private data structure. 3274dd40bcSBeniamino Galvani * 3374dd40bcSBeniamino Galvani * returns: the number of slots available for transmission in tx the ring. 3474dd40bcSBeniamino Galvani */ 3574dd40bcSBeniamino Galvani static inline int arc_emac_tx_avail(struct arc_emac_priv *priv) 3674dd40bcSBeniamino Galvani { 3774dd40bcSBeniamino Galvani return (priv->txbd_dirty + TX_BD_NUM - priv->txbd_curr - 1) % TX_BD_NUM; 3874dd40bcSBeniamino Galvani } 3974dd40bcSBeniamino Galvani 4074dd40bcSBeniamino Galvani /** 41e4f2379dSAlexey Brodkin * arc_emac_adjust_link - Adjust the PHY link duplex. 42e4f2379dSAlexey Brodkin * @ndev: Pointer to the net_device structure. 43e4f2379dSAlexey Brodkin * 44e4f2379dSAlexey Brodkin * This function is called to change the duplex setting after auto negotiation 45e4f2379dSAlexey Brodkin * is done by the PHY. 46e4f2379dSAlexey Brodkin */ 47e4f2379dSAlexey Brodkin static void arc_emac_adjust_link(struct net_device *ndev) 48e4f2379dSAlexey Brodkin { 49e4f2379dSAlexey Brodkin struct arc_emac_priv *priv = netdev_priv(ndev); 5001dea536SPhilippe Reynes struct phy_device *phy_dev = ndev->phydev; 51e4f2379dSAlexey Brodkin unsigned int reg, state_changed = 0; 52e4f2379dSAlexey Brodkin 53e4f2379dSAlexey Brodkin if (priv->link != phy_dev->link) { 54e4f2379dSAlexey Brodkin priv->link = phy_dev->link; 55e4f2379dSAlexey Brodkin state_changed = 1; 56e4f2379dSAlexey Brodkin } 57e4f2379dSAlexey Brodkin 58e4f2379dSAlexey Brodkin if (priv->speed != phy_dev->speed) { 59e4f2379dSAlexey Brodkin priv->speed = phy_dev->speed; 60e4f2379dSAlexey Brodkin state_changed = 1; 616eacf311SRomain Perier if (priv->set_mac_speed) 626eacf311SRomain Perier priv->set_mac_speed(priv, priv->speed); 63e4f2379dSAlexey Brodkin } 64e4f2379dSAlexey Brodkin 65e4f2379dSAlexey Brodkin if (priv->duplex != phy_dev->duplex) { 66e4f2379dSAlexey Brodkin reg = arc_reg_get(priv, R_CTRL); 67e4f2379dSAlexey Brodkin 68663713ebSCaesar Wang if (phy_dev->duplex == DUPLEX_FULL) 69e4f2379dSAlexey Brodkin reg |= ENFL_MASK; 70e4f2379dSAlexey Brodkin else 71e4f2379dSAlexey Brodkin reg &= ~ENFL_MASK; 72e4f2379dSAlexey Brodkin 73e4f2379dSAlexey Brodkin arc_reg_set(priv, R_CTRL, reg); 74e4f2379dSAlexey Brodkin priv->duplex = phy_dev->duplex; 75e4f2379dSAlexey Brodkin state_changed = 1; 76e4f2379dSAlexey Brodkin } 77e4f2379dSAlexey Brodkin 78e4f2379dSAlexey Brodkin if (state_changed) 79e4f2379dSAlexey Brodkin phy_print_status(phy_dev); 80e4f2379dSAlexey Brodkin } 81e4f2379dSAlexey Brodkin 82e4f2379dSAlexey Brodkin /** 83e4f2379dSAlexey Brodkin * arc_emac_get_drvinfo - Get EMAC driver information. 84e4f2379dSAlexey Brodkin * @ndev: Pointer to net_device structure. 85e4f2379dSAlexey Brodkin * @info: Pointer to ethtool_drvinfo structure. 86e4f2379dSAlexey Brodkin * 87e4f2379dSAlexey Brodkin * This implements ethtool command for getting the driver information. 88e4f2379dSAlexey Brodkin * Issue "ethtool -i ethX" under linux prompt to execute this function. 89e4f2379dSAlexey Brodkin */ 90e4f2379dSAlexey Brodkin static void arc_emac_get_drvinfo(struct net_device *ndev, 91e4f2379dSAlexey Brodkin struct ethtool_drvinfo *info) 92e4f2379dSAlexey Brodkin { 9323d2d9a6SRomain Perier struct arc_emac_priv *priv = netdev_priv(ndev); 9423d2d9a6SRomain Perier 9523d2d9a6SRomain Perier strlcpy(info->driver, priv->drv_name, sizeof(info->driver)); 9623d2d9a6SRomain Perier strlcpy(info->version, priv->drv_version, sizeof(info->version)); 97e4f2379dSAlexey Brodkin } 98e4f2379dSAlexey Brodkin 99e4f2379dSAlexey Brodkin static const struct ethtool_ops arc_emac_ethtool_ops = { 100e4f2379dSAlexey Brodkin .get_drvinfo = arc_emac_get_drvinfo, 101e4f2379dSAlexey Brodkin .get_link = ethtool_op_get_link, 1024694e6e3SPhilippe Reynes .get_link_ksettings = phy_ethtool_get_link_ksettings, 1034694e6e3SPhilippe Reynes .set_link_ksettings = phy_ethtool_set_link_ksettings, 104e4f2379dSAlexey Brodkin }; 105e4f2379dSAlexey Brodkin 106e4f2379dSAlexey Brodkin #define FIRST_OR_LAST_MASK (FIRST_MASK | LAST_MASK) 107e4f2379dSAlexey Brodkin 108e4f2379dSAlexey Brodkin /** 109e4f2379dSAlexey Brodkin * arc_emac_tx_clean - clears processed by EMAC Tx BDs. 110e4f2379dSAlexey Brodkin * @ndev: Pointer to the network device. 111e4f2379dSAlexey Brodkin */ 112e4f2379dSAlexey Brodkin static void arc_emac_tx_clean(struct net_device *ndev) 113e4f2379dSAlexey Brodkin { 114e4f2379dSAlexey Brodkin struct arc_emac_priv *priv = netdev_priv(ndev); 115ff458f6fSTobias Klauser struct net_device_stats *stats = &ndev->stats; 116e4f2379dSAlexey Brodkin unsigned int i; 117e4f2379dSAlexey Brodkin 118e4f2379dSAlexey Brodkin for (i = 0; i < TX_BD_NUM; i++) { 119e4f2379dSAlexey Brodkin unsigned int *txbd_dirty = &priv->txbd_dirty; 120e4f2379dSAlexey Brodkin struct arc_emac_bd *txbd = &priv->txbd[*txbd_dirty]; 121e4f2379dSAlexey Brodkin struct buffer_state *tx_buff = &priv->tx_buff[*txbd_dirty]; 122e4f2379dSAlexey Brodkin struct sk_buff *skb = tx_buff->skb; 123e4f2379dSAlexey Brodkin unsigned int info = le32_to_cpu(txbd->info); 124e4f2379dSAlexey Brodkin 125c278c253SAlexander Kochetkov if ((info & FOR_EMAC) || !txbd->data || !skb) 126e4f2379dSAlexey Brodkin break; 127e4f2379dSAlexey Brodkin 128e4f2379dSAlexey Brodkin if (unlikely(info & (DROP | DEFR | LTCL | UFLO))) { 129e4f2379dSAlexey Brodkin stats->tx_errors++; 130e4f2379dSAlexey Brodkin stats->tx_dropped++; 131e4f2379dSAlexey Brodkin 132e4f2379dSAlexey Brodkin if (info & DEFR) 133e4f2379dSAlexey Brodkin stats->tx_carrier_errors++; 134e4f2379dSAlexey Brodkin 135e4f2379dSAlexey Brodkin if (info & LTCL) 136e4f2379dSAlexey Brodkin stats->collisions++; 137e4f2379dSAlexey Brodkin 138e4f2379dSAlexey Brodkin if (info & UFLO) 139e4f2379dSAlexey Brodkin stats->tx_fifo_errors++; 140e4f2379dSAlexey Brodkin } else if (likely(info & FIRST_OR_LAST_MASK)) { 141e4f2379dSAlexey Brodkin stats->tx_packets++; 142e4f2379dSAlexey Brodkin stats->tx_bytes += skb->len; 143e4f2379dSAlexey Brodkin } 144e4f2379dSAlexey Brodkin 145a4a1139bSAlexey Brodkin dma_unmap_single(&ndev->dev, dma_unmap_addr(tx_buff, addr), 146a4a1139bSAlexey Brodkin dma_unmap_len(tx_buff, len), DMA_TO_DEVICE); 147e4f2379dSAlexey Brodkin 148e4f2379dSAlexey Brodkin /* return the sk_buff to system */ 149e4f2379dSAlexey Brodkin dev_kfree_skb_irq(skb); 150e4f2379dSAlexey Brodkin 151e4f2379dSAlexey Brodkin txbd->data = 0; 152e4f2379dSAlexey Brodkin txbd->info = 0; 153c278c253SAlexander Kochetkov tx_buff->skb = NULL; 154e4f2379dSAlexey Brodkin 15527082ee1SVineet Gupta *txbd_dirty = (*txbd_dirty + 1) % TX_BD_NUM; 156e4f2379dSAlexey Brodkin } 15774dd40bcSBeniamino Galvani 15874dd40bcSBeniamino Galvani /* Ensure that txbd_dirty is visible to tx() before checking 15974dd40bcSBeniamino Galvani * for queue stopped. 16074dd40bcSBeniamino Galvani */ 16174dd40bcSBeniamino Galvani smp_mb(); 16274dd40bcSBeniamino Galvani 16374dd40bcSBeniamino Galvani if (netif_queue_stopped(ndev) && arc_emac_tx_avail(priv)) 16474dd40bcSBeniamino Galvani netif_wake_queue(ndev); 165e4f2379dSAlexey Brodkin } 166e4f2379dSAlexey Brodkin 167e4f2379dSAlexey Brodkin /** 168e4f2379dSAlexey Brodkin * arc_emac_rx - processing of Rx packets. 169e4f2379dSAlexey Brodkin * @ndev: Pointer to the network device. 170e4f2379dSAlexey Brodkin * @budget: How many BDs to process on 1 call. 171e4f2379dSAlexey Brodkin * 172e4f2379dSAlexey Brodkin * returns: Number of processed BDs 173e4f2379dSAlexey Brodkin * 174e4f2379dSAlexey Brodkin * Iterate through Rx BDs and deliver received packages to upper layer. 175e4f2379dSAlexey Brodkin */ 176e4f2379dSAlexey Brodkin static int arc_emac_rx(struct net_device *ndev, int budget) 177e4f2379dSAlexey Brodkin { 178e4f2379dSAlexey Brodkin struct arc_emac_priv *priv = netdev_priv(ndev); 179e4f2379dSAlexey Brodkin unsigned int work_done; 180e4f2379dSAlexey Brodkin 1819cff866eSAlexey Brodkin for (work_done = 0; work_done < budget; work_done++) { 182e4f2379dSAlexey Brodkin unsigned int *last_rx_bd = &priv->last_rx_bd; 183ff458f6fSTobias Klauser struct net_device_stats *stats = &ndev->stats; 184e4f2379dSAlexey Brodkin struct buffer_state *rx_buff = &priv->rx_buff[*last_rx_bd]; 185e4f2379dSAlexey Brodkin struct arc_emac_bd *rxbd = &priv->rxbd[*last_rx_bd]; 186e4f2379dSAlexey Brodkin unsigned int pktlen, info = le32_to_cpu(rxbd->info); 187e4f2379dSAlexey Brodkin struct sk_buff *skb; 188e4f2379dSAlexey Brodkin dma_addr_t addr; 189e4f2379dSAlexey Brodkin 190e4f2379dSAlexey Brodkin if (unlikely((info & OWN_MASK) == FOR_EMAC)) 191e4f2379dSAlexey Brodkin break; 192e4f2379dSAlexey Brodkin 193e4f2379dSAlexey Brodkin /* Make a note that we saw a packet at this BD. 194e4f2379dSAlexey Brodkin * So next time, driver starts from this + 1 195e4f2379dSAlexey Brodkin */ 196e4f2379dSAlexey Brodkin *last_rx_bd = (*last_rx_bd + 1) % RX_BD_NUM; 197e4f2379dSAlexey Brodkin 198e4f2379dSAlexey Brodkin if (unlikely((info & FIRST_OR_LAST_MASK) != 199e4f2379dSAlexey Brodkin FIRST_OR_LAST_MASK)) { 200e4f2379dSAlexey Brodkin /* We pre-allocate buffers of MTU size so incoming 201e4f2379dSAlexey Brodkin * packets won't be split/chained. 202e4f2379dSAlexey Brodkin */ 203e4f2379dSAlexey Brodkin if (net_ratelimit()) 204e4f2379dSAlexey Brodkin netdev_err(ndev, "incomplete packet received\n"); 205e4f2379dSAlexey Brodkin 206e4f2379dSAlexey Brodkin /* Return ownership to EMAC */ 207a4a1139bSAlexey Brodkin rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE); 208e4f2379dSAlexey Brodkin stats->rx_errors++; 209e4f2379dSAlexey Brodkin stats->rx_length_errors++; 210e4f2379dSAlexey Brodkin continue; 211e4f2379dSAlexey Brodkin } 212e4f2379dSAlexey Brodkin 213e4f2379dSAlexey Brodkin pktlen = info & LEN_MASK; 214e4f2379dSAlexey Brodkin stats->rx_packets++; 215e4f2379dSAlexey Brodkin stats->rx_bytes += pktlen; 216e4f2379dSAlexey Brodkin skb = rx_buff->skb; 217e4f2379dSAlexey Brodkin skb_put(skb, pktlen); 218e4f2379dSAlexey Brodkin skb->dev = ndev; 219e4f2379dSAlexey Brodkin skb->protocol = eth_type_trans(skb, ndev); 220e4f2379dSAlexey Brodkin 221a4a1139bSAlexey Brodkin dma_unmap_single(&ndev->dev, dma_unmap_addr(rx_buff, addr), 222a4a1139bSAlexey Brodkin dma_unmap_len(rx_buff, len), DMA_FROM_DEVICE); 223e4f2379dSAlexey Brodkin 224e4f2379dSAlexey Brodkin /* Prepare the BD for next cycle */ 225a4a1139bSAlexey Brodkin rx_buff->skb = netdev_alloc_skb_ip_align(ndev, 226a4a1139bSAlexey Brodkin EMAC_BUFFER_SIZE); 227e4f2379dSAlexey Brodkin if (unlikely(!rx_buff->skb)) { 228e4f2379dSAlexey Brodkin stats->rx_errors++; 229e4f2379dSAlexey Brodkin /* Because receive_skb is below, increment rx_dropped */ 230e4f2379dSAlexey Brodkin stats->rx_dropped++; 231e4f2379dSAlexey Brodkin continue; 232e4f2379dSAlexey Brodkin } 233e4f2379dSAlexey Brodkin 234e4f2379dSAlexey Brodkin /* receive_skb only if new skb was allocated to avoid holes */ 235e4f2379dSAlexey Brodkin netif_receive_skb(skb); 236e4f2379dSAlexey Brodkin 237e4f2379dSAlexey Brodkin addr = dma_map_single(&ndev->dev, (void *)rx_buff->skb->data, 238a4a1139bSAlexey Brodkin EMAC_BUFFER_SIZE, DMA_FROM_DEVICE); 239e4f2379dSAlexey Brodkin if (dma_mapping_error(&ndev->dev, addr)) { 240e4f2379dSAlexey Brodkin if (net_ratelimit()) 241e4f2379dSAlexey Brodkin netdev_err(ndev, "cannot dma map\n"); 242e4f2379dSAlexey Brodkin dev_kfree_skb(rx_buff->skb); 243e4f2379dSAlexey Brodkin stats->rx_errors++; 244e4f2379dSAlexey Brodkin continue; 245e4f2379dSAlexey Brodkin } 246a4a1139bSAlexey Brodkin dma_unmap_addr_set(rx_buff, addr, addr); 247a4a1139bSAlexey Brodkin dma_unmap_len_set(rx_buff, len, EMAC_BUFFER_SIZE); 248e4f2379dSAlexey Brodkin 249a4a1139bSAlexey Brodkin rxbd->data = cpu_to_le32(addr); 250e4f2379dSAlexey Brodkin 251e4f2379dSAlexey Brodkin /* Make sure pointer to data buffer is set */ 252e4f2379dSAlexey Brodkin wmb(); 253e4f2379dSAlexey Brodkin 254e4f2379dSAlexey Brodkin /* Return ownership to EMAC */ 255a4a1139bSAlexey Brodkin rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE); 256e4f2379dSAlexey Brodkin } 257e4f2379dSAlexey Brodkin 258e4f2379dSAlexey Brodkin return work_done; 259e4f2379dSAlexey Brodkin } 260e4f2379dSAlexey Brodkin 261e4f2379dSAlexey Brodkin /** 262e4f2379dSAlexey Brodkin * arc_emac_poll - NAPI poll handler. 263e4f2379dSAlexey Brodkin * @napi: Pointer to napi_struct structure. 264e4f2379dSAlexey Brodkin * @budget: How many BDs to process on 1 call. 265e4f2379dSAlexey Brodkin * 266e4f2379dSAlexey Brodkin * returns: Number of processed BDs 267e4f2379dSAlexey Brodkin */ 268e4f2379dSAlexey Brodkin static int arc_emac_poll(struct napi_struct *napi, int budget) 269e4f2379dSAlexey Brodkin { 270e4f2379dSAlexey Brodkin struct net_device *ndev = napi->dev; 271e4f2379dSAlexey Brodkin struct arc_emac_priv *priv = netdev_priv(ndev); 272e4f2379dSAlexey Brodkin unsigned int work_done; 273e4f2379dSAlexey Brodkin 274e4f2379dSAlexey Brodkin arc_emac_tx_clean(ndev); 275e4f2379dSAlexey Brodkin 276e4f2379dSAlexey Brodkin work_done = arc_emac_rx(ndev, budget); 277e4f2379dSAlexey Brodkin if (work_done < budget) { 278e4f2379dSAlexey Brodkin napi_complete(napi); 2797ce7679dSBeniamino Galvani arc_reg_or(priv, R_ENABLE, RXINT_MASK | TXINT_MASK); 280e4f2379dSAlexey Brodkin } 281e4f2379dSAlexey Brodkin 282e4f2379dSAlexey Brodkin return work_done; 283e4f2379dSAlexey Brodkin } 284e4f2379dSAlexey Brodkin 285e4f2379dSAlexey Brodkin /** 286e4f2379dSAlexey Brodkin * arc_emac_intr - Global interrupt handler for EMAC. 287e4f2379dSAlexey Brodkin * @irq: irq number. 288e4f2379dSAlexey Brodkin * @dev_instance: device instance. 289e4f2379dSAlexey Brodkin * 290e4f2379dSAlexey Brodkin * returns: IRQ_HANDLED for all cases. 291e4f2379dSAlexey Brodkin * 292e4f2379dSAlexey Brodkin * ARC EMAC has only 1 interrupt line, and depending on bits raised in 293e4f2379dSAlexey Brodkin * STATUS register we may tell what is a reason for interrupt to fire. 294e4f2379dSAlexey Brodkin */ 295e4f2379dSAlexey Brodkin static irqreturn_t arc_emac_intr(int irq, void *dev_instance) 296e4f2379dSAlexey Brodkin { 297e4f2379dSAlexey Brodkin struct net_device *ndev = dev_instance; 298e4f2379dSAlexey Brodkin struct arc_emac_priv *priv = netdev_priv(ndev); 299ff458f6fSTobias Klauser struct net_device_stats *stats = &ndev->stats; 300e4f2379dSAlexey Brodkin unsigned int status; 301e4f2379dSAlexey Brodkin 302e4f2379dSAlexey Brodkin status = arc_reg_get(priv, R_STATUS); 303e4f2379dSAlexey Brodkin status &= ~MDIO_MASK; 304e4f2379dSAlexey Brodkin 305e4f2379dSAlexey Brodkin /* Reset all flags except "MDIO complete" */ 306e4f2379dSAlexey Brodkin arc_reg_set(priv, R_STATUS, status); 307e4f2379dSAlexey Brodkin 3087ce7679dSBeniamino Galvani if (status & (RXINT_MASK | TXINT_MASK)) { 309e4f2379dSAlexey Brodkin if (likely(napi_schedule_prep(&priv->napi))) { 3107ce7679dSBeniamino Galvani arc_reg_clr(priv, R_ENABLE, RXINT_MASK | TXINT_MASK); 311e4f2379dSAlexey Brodkin __napi_schedule(&priv->napi); 312e4f2379dSAlexey Brodkin } 313e4f2379dSAlexey Brodkin } 314e4f2379dSAlexey Brodkin 315e4f2379dSAlexey Brodkin if (status & ERR_MASK) { 316e4f2379dSAlexey Brodkin /* MSER/RXCR/RXFR/RXFL interrupt fires on corresponding 317e4f2379dSAlexey Brodkin * 8-bit error counter overrun. 318e4f2379dSAlexey Brodkin */ 319e4f2379dSAlexey Brodkin 320e4f2379dSAlexey Brodkin if (status & MSER_MASK) { 321e4f2379dSAlexey Brodkin stats->rx_missed_errors += 0x100; 322e4f2379dSAlexey Brodkin stats->rx_errors += 0x100; 323e4f2379dSAlexey Brodkin } 324e4f2379dSAlexey Brodkin 325e4f2379dSAlexey Brodkin if (status & RXCR_MASK) { 326e4f2379dSAlexey Brodkin stats->rx_crc_errors += 0x100; 327e4f2379dSAlexey Brodkin stats->rx_errors += 0x100; 328e4f2379dSAlexey Brodkin } 329e4f2379dSAlexey Brodkin 330e4f2379dSAlexey Brodkin if (status & RXFR_MASK) { 331e4f2379dSAlexey Brodkin stats->rx_frame_errors += 0x100; 332e4f2379dSAlexey Brodkin stats->rx_errors += 0x100; 333e4f2379dSAlexey Brodkin } 334e4f2379dSAlexey Brodkin 335e4f2379dSAlexey Brodkin if (status & RXFL_MASK) { 336e4f2379dSAlexey Brodkin stats->rx_over_errors += 0x100; 337e4f2379dSAlexey Brodkin stats->rx_errors += 0x100; 338e4f2379dSAlexey Brodkin } 339e4f2379dSAlexey Brodkin } 340e4f2379dSAlexey Brodkin 341e4f2379dSAlexey Brodkin return IRQ_HANDLED; 342e4f2379dSAlexey Brodkin } 343e4f2379dSAlexey Brodkin 3445a45e57aSBeniamino Galvani #ifdef CONFIG_NET_POLL_CONTROLLER 3455a45e57aSBeniamino Galvani static void arc_emac_poll_controller(struct net_device *dev) 3465a45e57aSBeniamino Galvani { 3475a45e57aSBeniamino Galvani disable_irq(dev->irq); 3485a45e57aSBeniamino Galvani arc_emac_intr(dev->irq, dev); 3495a45e57aSBeniamino Galvani enable_irq(dev->irq); 3505a45e57aSBeniamino Galvani } 3515a45e57aSBeniamino Galvani #endif 3525a45e57aSBeniamino Galvani 353e4f2379dSAlexey Brodkin /** 354e4f2379dSAlexey Brodkin * arc_emac_open - Open the network device. 355e4f2379dSAlexey Brodkin * @ndev: Pointer to the network device. 356e4f2379dSAlexey Brodkin * 357e4f2379dSAlexey Brodkin * returns: 0, on success or non-zero error value on failure. 358e4f2379dSAlexey Brodkin * 359e4f2379dSAlexey Brodkin * This function sets the MAC address, requests and enables an IRQ 360e4f2379dSAlexey Brodkin * for the EMAC device and starts the Tx queue. 361e4f2379dSAlexey Brodkin * It also connects to the phy device. 362e4f2379dSAlexey Brodkin */ 363e4f2379dSAlexey Brodkin static int arc_emac_open(struct net_device *ndev) 364e4f2379dSAlexey Brodkin { 365e4f2379dSAlexey Brodkin struct arc_emac_priv *priv = netdev_priv(ndev); 36601dea536SPhilippe Reynes struct phy_device *phy_dev = ndev->phydev; 367e4f2379dSAlexey Brodkin int i; 368e4f2379dSAlexey Brodkin 369e4f2379dSAlexey Brodkin phy_dev->autoneg = AUTONEG_ENABLE; 370e4f2379dSAlexey Brodkin phy_dev->speed = 0; 371e4f2379dSAlexey Brodkin phy_dev->duplex = 0; 372b0ac9564SFlorian Fainelli phy_dev->advertising &= phy_dev->supported; 373e4f2379dSAlexey Brodkin 374a4a1139bSAlexey Brodkin priv->last_rx_bd = 0; 375a4a1139bSAlexey Brodkin 376e4f2379dSAlexey Brodkin /* Allocate and set buffers for Rx BD's */ 377e4f2379dSAlexey Brodkin for (i = 0; i < RX_BD_NUM; i++) { 378a4a1139bSAlexey Brodkin dma_addr_t addr; 379a4a1139bSAlexey Brodkin unsigned int *last_rx_bd = &priv->last_rx_bd; 380a4a1139bSAlexey Brodkin struct arc_emac_bd *rxbd = &priv->rxbd[*last_rx_bd]; 381a4a1139bSAlexey Brodkin struct buffer_state *rx_buff = &priv->rx_buff[*last_rx_bd]; 382a4a1139bSAlexey Brodkin 383a4a1139bSAlexey Brodkin rx_buff->skb = netdev_alloc_skb_ip_align(ndev, 384a4a1139bSAlexey Brodkin EMAC_BUFFER_SIZE); 385a4a1139bSAlexey Brodkin if (unlikely(!rx_buff->skb)) 386e4f2379dSAlexey Brodkin return -ENOMEM; 387e4f2379dSAlexey Brodkin 388a4a1139bSAlexey Brodkin addr = dma_map_single(&ndev->dev, (void *)rx_buff->skb->data, 389a4a1139bSAlexey Brodkin EMAC_BUFFER_SIZE, DMA_FROM_DEVICE); 390a4a1139bSAlexey Brodkin if (dma_mapping_error(&ndev->dev, addr)) { 391a4a1139bSAlexey Brodkin netdev_err(ndev, "cannot dma map\n"); 392a4a1139bSAlexey Brodkin dev_kfree_skb(rx_buff->skb); 393a4a1139bSAlexey Brodkin return -ENOMEM; 394a4a1139bSAlexey Brodkin } 395a4a1139bSAlexey Brodkin dma_unmap_addr_set(rx_buff, addr, addr); 396a4a1139bSAlexey Brodkin dma_unmap_len_set(rx_buff, len, EMAC_BUFFER_SIZE); 397a4a1139bSAlexey Brodkin 398a4a1139bSAlexey Brodkin rxbd->data = cpu_to_le32(addr); 399e4f2379dSAlexey Brodkin 400e4f2379dSAlexey Brodkin /* Make sure pointer to data buffer is set */ 401e4f2379dSAlexey Brodkin wmb(); 402e4f2379dSAlexey Brodkin 403a4a1139bSAlexey Brodkin /* Return ownership to EMAC */ 404a4a1139bSAlexey Brodkin rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE); 405e4f2379dSAlexey Brodkin 406a4a1139bSAlexey Brodkin *last_rx_bd = (*last_rx_bd + 1) % RX_BD_NUM; 407a4a1139bSAlexey Brodkin } 408e4f2379dSAlexey Brodkin 40999f93a15SAlexander Kochetkov priv->txbd_curr = 0; 41099f93a15SAlexander Kochetkov priv->txbd_dirty = 0; 41199f93a15SAlexander Kochetkov 412e4f2379dSAlexey Brodkin /* Clean Tx BD's */ 413e4f2379dSAlexey Brodkin memset(priv->txbd, 0, TX_RING_SZ); 414e4f2379dSAlexey Brodkin 415e4f2379dSAlexey Brodkin /* Initialize logical address filter */ 416e4f2379dSAlexey Brodkin arc_reg_set(priv, R_LAFL, 0); 417e4f2379dSAlexey Brodkin arc_reg_set(priv, R_LAFH, 0); 418e4f2379dSAlexey Brodkin 419e4f2379dSAlexey Brodkin /* Set BD ring pointers for device side */ 420e4f2379dSAlexey Brodkin arc_reg_set(priv, R_RX_RING, (unsigned int)priv->rxbd_dma); 421e4f2379dSAlexey Brodkin arc_reg_set(priv, R_TX_RING, (unsigned int)priv->txbd_dma); 422e4f2379dSAlexey Brodkin 423e4f2379dSAlexey Brodkin /* Enable interrupts */ 4247ce7679dSBeniamino Galvani arc_reg_set(priv, R_ENABLE, RXINT_MASK | TXINT_MASK | ERR_MASK); 425e4f2379dSAlexey Brodkin 426e4f2379dSAlexey Brodkin /* Set CONTROL */ 427e4f2379dSAlexey Brodkin arc_reg_set(priv, R_CTRL, 428e4f2379dSAlexey Brodkin (RX_BD_NUM << 24) | /* RX BD table length */ 429e4f2379dSAlexey Brodkin (TX_BD_NUM << 16) | /* TX BD table length */ 430e4f2379dSAlexey Brodkin TXRN_MASK | RXRN_MASK); 431e4f2379dSAlexey Brodkin 432e4f2379dSAlexey Brodkin napi_enable(&priv->napi); 433e4f2379dSAlexey Brodkin 434e4f2379dSAlexey Brodkin /* Enable EMAC */ 435e4f2379dSAlexey Brodkin arc_reg_or(priv, R_CTRL, EN_MASK); 436e4f2379dSAlexey Brodkin 43701dea536SPhilippe Reynes phy_start_aneg(ndev->phydev); 438e4f2379dSAlexey Brodkin 439e4f2379dSAlexey Brodkin netif_start_queue(ndev); 440e4f2379dSAlexey Brodkin 441e4f2379dSAlexey Brodkin return 0; 442e4f2379dSAlexey Brodkin } 443e4f2379dSAlexey Brodkin 444e4f2379dSAlexey Brodkin /** 445775dd682SBeniamino Galvani * arc_emac_set_rx_mode - Change the receive filtering mode. 446775dd682SBeniamino Galvani * @ndev: Pointer to the network device. 447775dd682SBeniamino Galvani * 448775dd682SBeniamino Galvani * This function enables/disables promiscuous or all-multicast mode 449775dd682SBeniamino Galvani * and updates the multicast filtering list of the network device. 450775dd682SBeniamino Galvani */ 451775dd682SBeniamino Galvani static void arc_emac_set_rx_mode(struct net_device *ndev) 452775dd682SBeniamino Galvani { 453775dd682SBeniamino Galvani struct arc_emac_priv *priv = netdev_priv(ndev); 454775dd682SBeniamino Galvani 455775dd682SBeniamino Galvani if (ndev->flags & IFF_PROMISC) { 456775dd682SBeniamino Galvani arc_reg_or(priv, R_CTRL, PROM_MASK); 457775dd682SBeniamino Galvani } else { 458775dd682SBeniamino Galvani arc_reg_clr(priv, R_CTRL, PROM_MASK); 459775dd682SBeniamino Galvani 460775dd682SBeniamino Galvani if (ndev->flags & IFF_ALLMULTI) { 461775dd682SBeniamino Galvani arc_reg_set(priv, R_LAFL, ~0); 462775dd682SBeniamino Galvani arc_reg_set(priv, R_LAFH, ~0); 463775dd682SBeniamino Galvani } else { 464775dd682SBeniamino Galvani struct netdev_hw_addr *ha; 465775dd682SBeniamino Galvani unsigned int filter[2] = { 0, 0 }; 466775dd682SBeniamino Galvani int bit; 467775dd682SBeniamino Galvani 468775dd682SBeniamino Galvani netdev_for_each_mc_addr(ha, ndev) { 469775dd682SBeniamino Galvani bit = ether_crc_le(ETH_ALEN, ha->addr) >> 26; 470775dd682SBeniamino Galvani filter[bit >> 5] |= 1 << (bit & 31); 471775dd682SBeniamino Galvani } 472775dd682SBeniamino Galvani 473775dd682SBeniamino Galvani arc_reg_set(priv, R_LAFL, filter[0]); 474775dd682SBeniamino Galvani arc_reg_set(priv, R_LAFH, filter[1]); 475775dd682SBeniamino Galvani } 476775dd682SBeniamino Galvani } 477775dd682SBeniamino Galvani } 478775dd682SBeniamino Galvani 479775dd682SBeniamino Galvani /** 480b530b164SAlexander Kochetkov * arc_free_tx_queue - free skb from tx queue 481b530b164SAlexander Kochetkov * @ndev: Pointer to the network device. 482b530b164SAlexander Kochetkov * 483b530b164SAlexander Kochetkov * This function must be called while EMAC disable 484b530b164SAlexander Kochetkov */ 485b530b164SAlexander Kochetkov static void arc_free_tx_queue(struct net_device *ndev) 486b530b164SAlexander Kochetkov { 487b530b164SAlexander Kochetkov struct arc_emac_priv *priv = netdev_priv(ndev); 488b530b164SAlexander Kochetkov unsigned int i; 489b530b164SAlexander Kochetkov 490b530b164SAlexander Kochetkov for (i = 0; i < TX_BD_NUM; i++) { 491b530b164SAlexander Kochetkov struct arc_emac_bd *txbd = &priv->txbd[i]; 492b530b164SAlexander Kochetkov struct buffer_state *tx_buff = &priv->tx_buff[i]; 493b530b164SAlexander Kochetkov 494b530b164SAlexander Kochetkov if (tx_buff->skb) { 495663713ebSCaesar Wang dma_unmap_single(&ndev->dev, 496663713ebSCaesar Wang dma_unmap_addr(tx_buff, addr), 497663713ebSCaesar Wang dma_unmap_len(tx_buff, len), 498663713ebSCaesar Wang DMA_TO_DEVICE); 499b530b164SAlexander Kochetkov 500b530b164SAlexander Kochetkov /* return the sk_buff to system */ 501b530b164SAlexander Kochetkov dev_kfree_skb_irq(tx_buff->skb); 502b530b164SAlexander Kochetkov } 503b530b164SAlexander Kochetkov 504b530b164SAlexander Kochetkov txbd->info = 0; 505b530b164SAlexander Kochetkov txbd->data = 0; 506b530b164SAlexander Kochetkov tx_buff->skb = NULL; 507b530b164SAlexander Kochetkov } 508b530b164SAlexander Kochetkov } 509b530b164SAlexander Kochetkov 510b530b164SAlexander Kochetkov /** 511b530b164SAlexander Kochetkov * arc_free_rx_queue - free skb from rx queue 512b530b164SAlexander Kochetkov * @ndev: Pointer to the network device. 513b530b164SAlexander Kochetkov * 514b530b164SAlexander Kochetkov * This function must be called while EMAC disable 515b530b164SAlexander Kochetkov */ 516b530b164SAlexander Kochetkov static void arc_free_rx_queue(struct net_device *ndev) 517b530b164SAlexander Kochetkov { 518b530b164SAlexander Kochetkov struct arc_emac_priv *priv = netdev_priv(ndev); 519b530b164SAlexander Kochetkov unsigned int i; 520b530b164SAlexander Kochetkov 521b530b164SAlexander Kochetkov for (i = 0; i < RX_BD_NUM; i++) { 522b530b164SAlexander Kochetkov struct arc_emac_bd *rxbd = &priv->rxbd[i]; 523b530b164SAlexander Kochetkov struct buffer_state *rx_buff = &priv->rx_buff[i]; 524b530b164SAlexander Kochetkov 525b530b164SAlexander Kochetkov if (rx_buff->skb) { 526663713ebSCaesar Wang dma_unmap_single(&ndev->dev, 527663713ebSCaesar Wang dma_unmap_addr(rx_buff, addr), 528663713ebSCaesar Wang dma_unmap_len(rx_buff, len), 529663713ebSCaesar Wang DMA_FROM_DEVICE); 530b530b164SAlexander Kochetkov 531b530b164SAlexander Kochetkov /* return the sk_buff to system */ 532b530b164SAlexander Kochetkov dev_kfree_skb_irq(rx_buff->skb); 533b530b164SAlexander Kochetkov } 534b530b164SAlexander Kochetkov 535b530b164SAlexander Kochetkov rxbd->info = 0; 536b530b164SAlexander Kochetkov rxbd->data = 0; 537b530b164SAlexander Kochetkov rx_buff->skb = NULL; 538b530b164SAlexander Kochetkov } 539b530b164SAlexander Kochetkov } 540b530b164SAlexander Kochetkov 541b530b164SAlexander Kochetkov /** 542e4f2379dSAlexey Brodkin * arc_emac_stop - Close the network device. 543e4f2379dSAlexey Brodkin * @ndev: Pointer to the network device. 544e4f2379dSAlexey Brodkin * 545e4f2379dSAlexey Brodkin * This function stops the Tx queue, disables interrupts and frees the IRQ for 546e4f2379dSAlexey Brodkin * the EMAC device. 547e4f2379dSAlexey Brodkin * It also disconnects the PHY device associated with the EMAC device. 548e4f2379dSAlexey Brodkin */ 549e4f2379dSAlexey Brodkin static int arc_emac_stop(struct net_device *ndev) 550e4f2379dSAlexey Brodkin { 551e4f2379dSAlexey Brodkin struct arc_emac_priv *priv = netdev_priv(ndev); 552e4f2379dSAlexey Brodkin 553e4f2379dSAlexey Brodkin napi_disable(&priv->napi); 554e4f2379dSAlexey Brodkin netif_stop_queue(ndev); 555e4f2379dSAlexey Brodkin 556e4f2379dSAlexey Brodkin /* Disable interrupts */ 5577ce7679dSBeniamino Galvani arc_reg_clr(priv, R_ENABLE, RXINT_MASK | TXINT_MASK | ERR_MASK); 558e4f2379dSAlexey Brodkin 559e4f2379dSAlexey Brodkin /* Disable EMAC */ 560e4f2379dSAlexey Brodkin arc_reg_clr(priv, R_CTRL, EN_MASK); 561e4f2379dSAlexey Brodkin 562b530b164SAlexander Kochetkov /* Return the sk_buff to system */ 563b530b164SAlexander Kochetkov arc_free_tx_queue(ndev); 564b530b164SAlexander Kochetkov arc_free_rx_queue(ndev); 565b530b164SAlexander Kochetkov 566e4f2379dSAlexey Brodkin return 0; 567e4f2379dSAlexey Brodkin } 568e4f2379dSAlexey Brodkin 569e4f2379dSAlexey Brodkin /** 570e4f2379dSAlexey Brodkin * arc_emac_stats - Get system network statistics. 571e4f2379dSAlexey Brodkin * @ndev: Pointer to net_device structure. 572e4f2379dSAlexey Brodkin * 573e4f2379dSAlexey Brodkin * Returns the address of the device statistics structure. 574e4f2379dSAlexey Brodkin * Statistics are updated in interrupt handler. 575e4f2379dSAlexey Brodkin */ 576e4f2379dSAlexey Brodkin static struct net_device_stats *arc_emac_stats(struct net_device *ndev) 577e4f2379dSAlexey Brodkin { 578e4f2379dSAlexey Brodkin struct arc_emac_priv *priv = netdev_priv(ndev); 579ff458f6fSTobias Klauser struct net_device_stats *stats = &ndev->stats; 580e4f2379dSAlexey Brodkin unsigned long miss, rxerr; 581e4f2379dSAlexey Brodkin u8 rxcrc, rxfram, rxoflow; 582e4f2379dSAlexey Brodkin 583e4f2379dSAlexey Brodkin rxerr = arc_reg_get(priv, R_RXERR); 584e4f2379dSAlexey Brodkin miss = arc_reg_get(priv, R_MISS); 585e4f2379dSAlexey Brodkin 586e4f2379dSAlexey Brodkin rxcrc = rxerr; 587e4f2379dSAlexey Brodkin rxfram = rxerr >> 8; 588e4f2379dSAlexey Brodkin rxoflow = rxerr >> 16; 589e4f2379dSAlexey Brodkin 590e4f2379dSAlexey Brodkin stats->rx_errors += miss; 591e4f2379dSAlexey Brodkin stats->rx_errors += rxcrc + rxfram + rxoflow; 592e4f2379dSAlexey Brodkin 593e4f2379dSAlexey Brodkin stats->rx_over_errors += rxoflow; 594e4f2379dSAlexey Brodkin stats->rx_frame_errors += rxfram; 595e4f2379dSAlexey Brodkin stats->rx_crc_errors += rxcrc; 596e4f2379dSAlexey Brodkin stats->rx_missed_errors += miss; 597e4f2379dSAlexey Brodkin 598e4f2379dSAlexey Brodkin return stats; 599e4f2379dSAlexey Brodkin } 600e4f2379dSAlexey Brodkin 601e4f2379dSAlexey Brodkin /** 602e4f2379dSAlexey Brodkin * arc_emac_tx - Starts the data transmission. 603e4f2379dSAlexey Brodkin * @skb: sk_buff pointer that contains data to be Transmitted. 604e4f2379dSAlexey Brodkin * @ndev: Pointer to net_device structure. 605e4f2379dSAlexey Brodkin * 606e4f2379dSAlexey Brodkin * returns: NETDEV_TX_OK, on success 607e4f2379dSAlexey Brodkin * NETDEV_TX_BUSY, if any of the descriptors are not free. 608e4f2379dSAlexey Brodkin * 609e4f2379dSAlexey Brodkin * This function is invoked from upper layers to initiate transmission. 610e4f2379dSAlexey Brodkin */ 611e4f2379dSAlexey Brodkin static int arc_emac_tx(struct sk_buff *skb, struct net_device *ndev) 612e4f2379dSAlexey Brodkin { 613e4f2379dSAlexey Brodkin struct arc_emac_priv *priv = netdev_priv(ndev); 614e4f2379dSAlexey Brodkin unsigned int len, *txbd_curr = &priv->txbd_curr; 615ff458f6fSTobias Klauser struct net_device_stats *stats = &ndev->stats; 616e4f2379dSAlexey Brodkin __le32 *info = &priv->txbd[*txbd_curr].info; 617e4f2379dSAlexey Brodkin dma_addr_t addr; 618e4f2379dSAlexey Brodkin 619e4f2379dSAlexey Brodkin if (skb_padto(skb, ETH_ZLEN)) 620e4f2379dSAlexey Brodkin return NETDEV_TX_OK; 621e4f2379dSAlexey Brodkin 622e4f2379dSAlexey Brodkin len = max_t(unsigned int, ETH_ZLEN, skb->len); 623e4f2379dSAlexey Brodkin 62474dd40bcSBeniamino Galvani if (unlikely(!arc_emac_tx_avail(priv))) { 625e4f2379dSAlexey Brodkin netif_stop_queue(ndev); 62674dd40bcSBeniamino Galvani netdev_err(ndev, "BUG! Tx Ring full when queue awake!\n"); 627e4f2379dSAlexey Brodkin return NETDEV_TX_BUSY; 628e4f2379dSAlexey Brodkin } 629e4f2379dSAlexey Brodkin 630e4f2379dSAlexey Brodkin addr = dma_map_single(&ndev->dev, (void *)skb->data, len, 631e4f2379dSAlexey Brodkin DMA_TO_DEVICE); 632e4f2379dSAlexey Brodkin 633e4f2379dSAlexey Brodkin if (unlikely(dma_mapping_error(&ndev->dev, addr))) { 634e4f2379dSAlexey Brodkin stats->tx_dropped++; 635e4f2379dSAlexey Brodkin stats->tx_errors++; 636e4f2379dSAlexey Brodkin dev_kfree_skb(skb); 637e4f2379dSAlexey Brodkin return NETDEV_TX_OK; 638e4f2379dSAlexey Brodkin } 639a4a1139bSAlexey Brodkin dma_unmap_addr_set(&priv->tx_buff[*txbd_curr], addr, addr); 640e4f2379dSAlexey Brodkin dma_unmap_len_set(&priv->tx_buff[*txbd_curr], len, len); 641e4f2379dSAlexey Brodkin 642a4a1139bSAlexey Brodkin priv->txbd[*txbd_curr].data = cpu_to_le32(addr); 643e4f2379dSAlexey Brodkin 644e4f2379dSAlexey Brodkin /* Make sure pointer to data buffer is set */ 645e4f2379dSAlexey Brodkin wmb(); 646e4f2379dSAlexey Brodkin 64737ec274eSEric Dumazet skb_tx_timestamp(skb); 64837ec274eSEric Dumazet 649e4f2379dSAlexey Brodkin *info = cpu_to_le32(FOR_EMAC | FIRST_OR_LAST_MASK | len); 650e4f2379dSAlexey Brodkin 651c278c253SAlexander Kochetkov /* Make sure info word is set */ 652c278c253SAlexander Kochetkov wmb(); 653c278c253SAlexander Kochetkov 654c278c253SAlexander Kochetkov priv->tx_buff[*txbd_curr].skb = skb; 655c278c253SAlexander Kochetkov 656e4f2379dSAlexey Brodkin /* Increment index to point to the next BD */ 657e4f2379dSAlexey Brodkin *txbd_curr = (*txbd_curr + 1) % TX_BD_NUM; 658e4f2379dSAlexey Brodkin 65974dd40bcSBeniamino Galvani /* Ensure that tx_clean() sees the new txbd_curr before 66074dd40bcSBeniamino Galvani * checking the queue status. This prevents an unneeded wake 66174dd40bcSBeniamino Galvani * of the queue in tx_clean(). 66274dd40bcSBeniamino Galvani */ 66374dd40bcSBeniamino Galvani smp_mb(); 664e4f2379dSAlexey Brodkin 66574dd40bcSBeniamino Galvani if (!arc_emac_tx_avail(priv)) { 666e4f2379dSAlexey Brodkin netif_stop_queue(ndev); 66774dd40bcSBeniamino Galvani /* Refresh tx_dirty */ 66874dd40bcSBeniamino Galvani smp_mb(); 66974dd40bcSBeniamino Galvani if (arc_emac_tx_avail(priv)) 67074dd40bcSBeniamino Galvani netif_start_queue(ndev); 67174dd40bcSBeniamino Galvani } 672e4f2379dSAlexey Brodkin 673e4f2379dSAlexey Brodkin arc_reg_set(priv, R_STATUS, TXPL_MASK); 674e4f2379dSAlexey Brodkin 675e4f2379dSAlexey Brodkin return NETDEV_TX_OK; 676e4f2379dSAlexey Brodkin } 677e4f2379dSAlexey Brodkin 678235a251aSMax Schwarz static void arc_emac_set_address_internal(struct net_device *ndev) 679235a251aSMax Schwarz { 680235a251aSMax Schwarz struct arc_emac_priv *priv = netdev_priv(ndev); 681235a251aSMax Schwarz unsigned int addr_low, addr_hi; 682235a251aSMax Schwarz 683235a251aSMax Schwarz addr_low = le32_to_cpu(*(__le32 *)&ndev->dev_addr[0]); 684235a251aSMax Schwarz addr_hi = le16_to_cpu(*(__le16 *)&ndev->dev_addr[4]); 685235a251aSMax Schwarz 686235a251aSMax Schwarz arc_reg_set(priv, R_ADDRL, addr_low); 687235a251aSMax Schwarz arc_reg_set(priv, R_ADDRH, addr_hi); 688235a251aSMax Schwarz } 689235a251aSMax Schwarz 690e4f2379dSAlexey Brodkin /** 691e4f2379dSAlexey Brodkin * arc_emac_set_address - Set the MAC address for this device. 692e4f2379dSAlexey Brodkin * @ndev: Pointer to net_device structure. 693e4f2379dSAlexey Brodkin * @p: 6 byte Address to be written as MAC address. 694e4f2379dSAlexey Brodkin * 695e4f2379dSAlexey Brodkin * This function copies the HW address from the sockaddr structure to the 696e4f2379dSAlexey Brodkin * net_device structure and updates the address in HW. 697e4f2379dSAlexey Brodkin * 698e4f2379dSAlexey Brodkin * returns: -EBUSY if the net device is busy or 0 if the address is set 699e4f2379dSAlexey Brodkin * successfully. 700e4f2379dSAlexey Brodkin */ 701e4f2379dSAlexey Brodkin static int arc_emac_set_address(struct net_device *ndev, void *p) 702e4f2379dSAlexey Brodkin { 703e4f2379dSAlexey Brodkin struct sockaddr *addr = p; 704e4f2379dSAlexey Brodkin 705e4f2379dSAlexey Brodkin if (netif_running(ndev)) 706e4f2379dSAlexey Brodkin return -EBUSY; 707e4f2379dSAlexey Brodkin 708e4f2379dSAlexey Brodkin if (!is_valid_ether_addr(addr->sa_data)) 709e4f2379dSAlexey Brodkin return -EADDRNOTAVAIL; 710e4f2379dSAlexey Brodkin 711e4f2379dSAlexey Brodkin memcpy(ndev->dev_addr, addr->sa_data, ndev->addr_len); 712e4f2379dSAlexey Brodkin 713235a251aSMax Schwarz arc_emac_set_address_internal(ndev); 714e4f2379dSAlexey Brodkin 715e4f2379dSAlexey Brodkin return 0; 716e4f2379dSAlexey Brodkin } 717e4f2379dSAlexey Brodkin 718e4f2379dSAlexey Brodkin static const struct net_device_ops arc_emac_netdev_ops = { 719e4f2379dSAlexey Brodkin .ndo_open = arc_emac_open, 720e4f2379dSAlexey Brodkin .ndo_stop = arc_emac_stop, 721e4f2379dSAlexey Brodkin .ndo_start_xmit = arc_emac_tx, 722e4f2379dSAlexey Brodkin .ndo_set_mac_address = arc_emac_set_address, 723e4f2379dSAlexey Brodkin .ndo_get_stats = arc_emac_stats, 724775dd682SBeniamino Galvani .ndo_set_rx_mode = arc_emac_set_rx_mode, 7255a45e57aSBeniamino Galvani #ifdef CONFIG_NET_POLL_CONTROLLER 7265a45e57aSBeniamino Galvani .ndo_poll_controller = arc_emac_poll_controller, 7275a45e57aSBeniamino Galvani #endif 728e4f2379dSAlexey Brodkin }; 729e4f2379dSAlexey Brodkin 73023d2d9a6SRomain Perier int arc_emac_probe(struct net_device *ndev, int interface) 731e4f2379dSAlexey Brodkin { 73223d2d9a6SRomain Perier struct device *dev = ndev->dev.parent; 733f7578496SThierry Reding struct resource res_regs; 734e4f2379dSAlexey Brodkin struct device_node *phy_node; 73501dea536SPhilippe Reynes struct phy_device *phydev = NULL; 736e4f2379dSAlexey Brodkin struct arc_emac_priv *priv; 737e4f2379dSAlexey Brodkin const char *mac_addr; 738f7578496SThierry Reding unsigned int id, clock_frequency, irq; 739e4f2379dSAlexey Brodkin int err; 740e4f2379dSAlexey Brodkin 741e4f2379dSAlexey Brodkin /* Get PHY from device tree */ 742f15f44e0SRomain Perier phy_node = of_parse_phandle(dev->of_node, "phy", 0); 743e4f2379dSAlexey Brodkin if (!phy_node) { 744f15f44e0SRomain Perier dev_err(dev, "failed to retrieve phy description from device tree\n"); 745e4f2379dSAlexey Brodkin return -ENODEV; 746e4f2379dSAlexey Brodkin } 747e4f2379dSAlexey Brodkin 748e4f2379dSAlexey Brodkin /* Get EMAC registers base address from device tree */ 749f15f44e0SRomain Perier err = of_address_to_resource(dev->of_node, 0, &res_regs); 750e4f2379dSAlexey Brodkin if (err) { 751f15f44e0SRomain Perier dev_err(dev, "failed to retrieve registers base from device tree\n"); 752a94efbd7SPeter Chen err = -ENODEV; 753a94efbd7SPeter Chen goto out_put_node; 754e4f2379dSAlexey Brodkin } 755e4f2379dSAlexey Brodkin 756e4f2379dSAlexey Brodkin /* Get IRQ from device tree */ 757f15f44e0SRomain Perier irq = irq_of_parse_and_map(dev->of_node, 0); 758f7578496SThierry Reding if (!irq) { 759f15f44e0SRomain Perier dev_err(dev, "failed to retrieve <irq> value from device tree\n"); 760a94efbd7SPeter Chen err = -ENODEV; 761a94efbd7SPeter Chen goto out_put_node; 762e4f2379dSAlexey Brodkin } 763e4f2379dSAlexey Brodkin 764e4f2379dSAlexey Brodkin ndev->netdev_ops = &arc_emac_netdev_ops; 765e4f2379dSAlexey Brodkin ndev->ethtool_ops = &arc_emac_ethtool_ops; 766e4f2379dSAlexey Brodkin ndev->watchdog_timeo = TX_TIMEOUT; 767e4f2379dSAlexey Brodkin /* FIXME :: no multicast support yet */ 768e4f2379dSAlexey Brodkin ndev->flags &= ~IFF_MULTICAST; 769e4f2379dSAlexey Brodkin 770e4f2379dSAlexey Brodkin priv = netdev_priv(ndev); 771f15f44e0SRomain Perier priv->dev = dev; 772e4f2379dSAlexey Brodkin 773f15f44e0SRomain Perier priv->regs = devm_ioremap_resource(dev, &res_regs); 774663713ebSCaesar Wang if (IS_ERR(priv->regs)) 77523d2d9a6SRomain Perier return PTR_ERR(priv->regs); 776663713ebSCaesar Wang 777f15f44e0SRomain Perier dev_dbg(dev, "Registers base address is 0x%p\n", priv->regs); 778e4f2379dSAlexey Brodkin 77923d2d9a6SRomain Perier if (priv->clk) { 78023d2d9a6SRomain Perier err = clk_prepare_enable(priv->clk); 78123d2d9a6SRomain Perier if (err) { 78223d2d9a6SRomain Perier dev_err(dev, "failed to enable clock\n"); 783a94efbd7SPeter Chen goto out_put_node; 78423d2d9a6SRomain Perier } 78523d2d9a6SRomain Perier 78623d2d9a6SRomain Perier clock_frequency = clk_get_rate(priv->clk); 78723d2d9a6SRomain Perier } else { 78888154c96SHeiko Stübner /* Get CPU clock frequency from device tree */ 789f15f44e0SRomain Perier if (of_property_read_u32(dev->of_node, "clock-frequency", 79088154c96SHeiko Stübner &clock_frequency)) { 791f15f44e0SRomain Perier dev_err(dev, "failed to retrieve <clock-frequency> from device tree\n"); 792a94efbd7SPeter Chen err = -EINVAL; 793a94efbd7SPeter Chen goto out_put_node; 79488154c96SHeiko Stübner } 79588154c96SHeiko Stübner } 79688154c96SHeiko Stübner 797e4f2379dSAlexey Brodkin id = arc_reg_get(priv, R_ID); 798e4f2379dSAlexey Brodkin 799e4f2379dSAlexey Brodkin /* Check for EMAC revision 5 or 7, magic number */ 800e4f2379dSAlexey Brodkin if (!(id == 0x0005fd02 || id == 0x0007fd02)) { 801f15f44e0SRomain Perier dev_err(dev, "ARC EMAC not detected, id=0x%x\n", id); 802e4f2379dSAlexey Brodkin err = -ENODEV; 80388154c96SHeiko Stübner goto out_clken; 804e4f2379dSAlexey Brodkin } 805f15f44e0SRomain Perier dev_info(dev, "ARC EMAC detected with id: 0x%x\n", id); 806e4f2379dSAlexey Brodkin 807e4f2379dSAlexey Brodkin /* Set poll rate so that it polls every 1 ms */ 808e4f2379dSAlexey Brodkin arc_reg_set(priv, R_POLLRATE, clock_frequency / 1000000); 809e4f2379dSAlexey Brodkin 810f7578496SThierry Reding ndev->irq = irq; 811f15f44e0SRomain Perier dev_info(dev, "IRQ is %d\n", ndev->irq); 812e4f2379dSAlexey Brodkin 813e4f2379dSAlexey Brodkin /* Register interrupt handler for device */ 814f15f44e0SRomain Perier err = devm_request_irq(dev, ndev->irq, arc_emac_intr, 0, 815e4f2379dSAlexey Brodkin ndev->name, ndev); 816e4f2379dSAlexey Brodkin if (err) { 817f15f44e0SRomain Perier dev_err(dev, "could not allocate IRQ\n"); 81888154c96SHeiko Stübner goto out_clken; 819e4f2379dSAlexey Brodkin } 820e4f2379dSAlexey Brodkin 821e4f2379dSAlexey Brodkin /* Get MAC address from device tree */ 822f15f44e0SRomain Perier mac_addr = of_get_mac_address(dev->of_node); 823e4f2379dSAlexey Brodkin 82499470819SLuka Perkov if (mac_addr) 825e4f2379dSAlexey Brodkin memcpy(ndev->dev_addr, mac_addr, ETH_ALEN); 82699470819SLuka Perkov else 82799470819SLuka Perkov eth_hw_addr_random(ndev); 828e4f2379dSAlexey Brodkin 829235a251aSMax Schwarz arc_emac_set_address_internal(ndev); 830f15f44e0SRomain Perier dev_info(dev, "MAC address is now %pM\n", ndev->dev_addr); 831e4f2379dSAlexey Brodkin 832e4f2379dSAlexey Brodkin /* Do 1 allocation instead of 2 separate ones for Rx and Tx BD rings */ 833f15f44e0SRomain Perier priv->rxbd = dmam_alloc_coherent(dev, RX_RING_SZ + TX_RING_SZ, 834e4f2379dSAlexey Brodkin &priv->rxbd_dma, GFP_KERNEL); 835e4f2379dSAlexey Brodkin 836e4f2379dSAlexey Brodkin if (!priv->rxbd) { 837f15f44e0SRomain Perier dev_err(dev, "failed to allocate data buffers\n"); 838e4f2379dSAlexey Brodkin err = -ENOMEM; 83988154c96SHeiko Stübner goto out_clken; 840e4f2379dSAlexey Brodkin } 841e4f2379dSAlexey Brodkin 842e4f2379dSAlexey Brodkin priv->txbd = priv->rxbd + RX_BD_NUM; 843e4f2379dSAlexey Brodkin 844e4f2379dSAlexey Brodkin priv->txbd_dma = priv->rxbd_dma + RX_RING_SZ; 845f15f44e0SRomain Perier dev_dbg(dev, "EMAC Device addr: Rx Ring [0x%x], Tx Ring[%x]\n", 846e4f2379dSAlexey Brodkin (unsigned int)priv->rxbd_dma, (unsigned int)priv->txbd_dma); 847e4f2379dSAlexey Brodkin 84893e91b3dSRomain Perier err = arc_mdio_probe(priv); 849e4f2379dSAlexey Brodkin if (err) { 850f15f44e0SRomain Perier dev_err(dev, "failed to probe MII bus\n"); 85188154c96SHeiko Stübner goto out_clken; 852e4f2379dSAlexey Brodkin } 853e4f2379dSAlexey Brodkin 85401dea536SPhilippe Reynes phydev = of_phy_connect(ndev, phy_node, arc_emac_adjust_link, 0, 85523d2d9a6SRomain Perier interface); 85601dea536SPhilippe Reynes if (!phydev) { 857f15f44e0SRomain Perier dev_err(dev, "of_phy_connect() failed\n"); 858e4f2379dSAlexey Brodkin err = -ENODEV; 859796bec1eSHeiko Stübner goto out_mdio; 860e4f2379dSAlexey Brodkin } 861e4f2379dSAlexey Brodkin 862f15f44e0SRomain Perier dev_info(dev, "connected to %s phy with id 0x%x\n", 86301dea536SPhilippe Reynes phydev->drv->name, phydev->phy_id); 864e4f2379dSAlexey Brodkin 865e4f2379dSAlexey Brodkin netif_napi_add(ndev, &priv->napi, arc_emac_poll, ARC_EMAC_NAPI_WEIGHT); 866e4f2379dSAlexey Brodkin 867e4f2379dSAlexey Brodkin err = register_netdev(ndev); 868e4f2379dSAlexey Brodkin if (err) { 869f15f44e0SRomain Perier dev_err(dev, "failed to register network device\n"); 870796bec1eSHeiko Stübner goto out_netif_api; 871e4f2379dSAlexey Brodkin } 872e4f2379dSAlexey Brodkin 873a94efbd7SPeter Chen of_node_put(phy_node); 874e4f2379dSAlexey Brodkin return 0; 875e4f2379dSAlexey Brodkin 876796bec1eSHeiko Stübner out_netif_api: 877796bec1eSHeiko Stübner netif_napi_del(&priv->napi); 87801dea536SPhilippe Reynes phy_disconnect(phydev); 879796bec1eSHeiko Stübner out_mdio: 880796bec1eSHeiko Stübner arc_mdio_remove(priv); 88188154c96SHeiko Stübner out_clken: 88223d2d9a6SRomain Perier if (priv->clk) 88388154c96SHeiko Stübner clk_disable_unprepare(priv->clk); 884a94efbd7SPeter Chen out_put_node: 885a94efbd7SPeter Chen of_node_put(phy_node); 886a94efbd7SPeter Chen 887e4f2379dSAlexey Brodkin return err; 888e4f2379dSAlexey Brodkin } 88923d2d9a6SRomain Perier EXPORT_SYMBOL_GPL(arc_emac_probe); 890e4f2379dSAlexey Brodkin 89123d2d9a6SRomain Perier int arc_emac_remove(struct net_device *ndev) 892e4f2379dSAlexey Brodkin { 893e4f2379dSAlexey Brodkin struct arc_emac_priv *priv = netdev_priv(ndev); 894e4f2379dSAlexey Brodkin 89501dea536SPhilippe Reynes phy_disconnect(ndev->phydev); 896e4f2379dSAlexey Brodkin arc_mdio_remove(priv); 897e4f2379dSAlexey Brodkin unregister_netdev(ndev); 898e4f2379dSAlexey Brodkin netif_napi_del(&priv->napi); 89988154c96SHeiko Stübner 900663713ebSCaesar Wang if (!IS_ERR(priv->clk)) 90188154c96SHeiko Stübner clk_disable_unprepare(priv->clk); 902e4f2379dSAlexey Brodkin 903e4f2379dSAlexey Brodkin return 0; 904e4f2379dSAlexey Brodkin } 90523d2d9a6SRomain Perier EXPORT_SYMBOL_GPL(arc_emac_remove); 906e4f2379dSAlexey Brodkin 907e4f2379dSAlexey Brodkin MODULE_AUTHOR("Alexey Brodkin <abrodkin@synopsys.com>"); 908e4f2379dSAlexey Brodkin MODULE_DESCRIPTION("ARC EMAC driver"); 909e4f2379dSAlexey Brodkin MODULE_LICENSE("GPL"); 910