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 213e688822dSAlexander Kochetkov /* Prepare the BD for next cycle. netif_receive_skb() 214e688822dSAlexander Kochetkov * only if new skb was allocated and mapped to avoid holes 215e688822dSAlexander Kochetkov * in the RX fifo. 216e688822dSAlexander Kochetkov */ 217e688822dSAlexander Kochetkov skb = netdev_alloc_skb_ip_align(ndev, EMAC_BUFFER_SIZE); 218e688822dSAlexander Kochetkov if (unlikely(!skb)) { 219e688822dSAlexander Kochetkov if (net_ratelimit()) 220e688822dSAlexander Kochetkov netdev_err(ndev, "cannot allocate skb\n"); 221e688822dSAlexander Kochetkov /* Return ownership to EMAC */ 222e688822dSAlexander Kochetkov rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE); 223e4f2379dSAlexey Brodkin stats->rx_errors++; 224e4f2379dSAlexey Brodkin stats->rx_dropped++; 225e4f2379dSAlexey Brodkin continue; 226e4f2379dSAlexey Brodkin } 227e4f2379dSAlexey Brodkin 228e688822dSAlexander Kochetkov addr = dma_map_single(&ndev->dev, (void *)skb->data, 229a4a1139bSAlexey Brodkin EMAC_BUFFER_SIZE, DMA_FROM_DEVICE); 230e4f2379dSAlexey Brodkin if (dma_mapping_error(&ndev->dev, addr)) { 231e4f2379dSAlexey Brodkin if (net_ratelimit()) 232e688822dSAlexander Kochetkov netdev_err(ndev, "cannot map dma buffer\n"); 233e688822dSAlexander Kochetkov dev_kfree_skb(skb); 234e688822dSAlexander Kochetkov /* Return ownership to EMAC */ 235e688822dSAlexander Kochetkov rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE); 236e4f2379dSAlexey Brodkin stats->rx_errors++; 237e688822dSAlexander Kochetkov stats->rx_dropped++; 238e4f2379dSAlexey Brodkin continue; 239e4f2379dSAlexey Brodkin } 240e688822dSAlexander Kochetkov 241e688822dSAlexander Kochetkov /* unmap previosly mapped skb */ 242e688822dSAlexander Kochetkov dma_unmap_single(&ndev->dev, dma_unmap_addr(rx_buff, addr), 243e688822dSAlexander Kochetkov dma_unmap_len(rx_buff, len), DMA_FROM_DEVICE); 244e688822dSAlexander Kochetkov 245e688822dSAlexander Kochetkov pktlen = info & LEN_MASK; 246e688822dSAlexander Kochetkov stats->rx_packets++; 247e688822dSAlexander Kochetkov stats->rx_bytes += pktlen; 248e688822dSAlexander Kochetkov skb_put(rx_buff->skb, pktlen); 249e688822dSAlexander Kochetkov rx_buff->skb->dev = ndev; 250e688822dSAlexander Kochetkov rx_buff->skb->protocol = eth_type_trans(rx_buff->skb, ndev); 251e688822dSAlexander Kochetkov 252e688822dSAlexander Kochetkov netif_receive_skb(rx_buff->skb); 253e688822dSAlexander Kochetkov 254e688822dSAlexander Kochetkov rx_buff->skb = skb; 255a4a1139bSAlexey Brodkin dma_unmap_addr_set(rx_buff, addr, addr); 256a4a1139bSAlexey Brodkin dma_unmap_len_set(rx_buff, len, EMAC_BUFFER_SIZE); 257e4f2379dSAlexey Brodkin 258a4a1139bSAlexey Brodkin rxbd->data = cpu_to_le32(addr); 259e4f2379dSAlexey Brodkin 260e4f2379dSAlexey Brodkin /* Make sure pointer to data buffer is set */ 261e4f2379dSAlexey Brodkin wmb(); 262e4f2379dSAlexey Brodkin 263e4f2379dSAlexey Brodkin /* Return ownership to EMAC */ 264a4a1139bSAlexey Brodkin rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE); 265e4f2379dSAlexey Brodkin } 266e4f2379dSAlexey Brodkin 267e4f2379dSAlexey Brodkin return work_done; 268e4f2379dSAlexey Brodkin } 269e4f2379dSAlexey Brodkin 270e4f2379dSAlexey Brodkin /** 271e4f2379dSAlexey Brodkin * arc_emac_poll - NAPI poll handler. 272e4f2379dSAlexey Brodkin * @napi: Pointer to napi_struct structure. 273e4f2379dSAlexey Brodkin * @budget: How many BDs to process on 1 call. 274e4f2379dSAlexey Brodkin * 275e4f2379dSAlexey Brodkin * returns: Number of processed BDs 276e4f2379dSAlexey Brodkin */ 277e4f2379dSAlexey Brodkin static int arc_emac_poll(struct napi_struct *napi, int budget) 278e4f2379dSAlexey Brodkin { 279e4f2379dSAlexey Brodkin struct net_device *ndev = napi->dev; 280e4f2379dSAlexey Brodkin struct arc_emac_priv *priv = netdev_priv(ndev); 281e4f2379dSAlexey Brodkin unsigned int work_done; 282e4f2379dSAlexey Brodkin 283e4f2379dSAlexey Brodkin arc_emac_tx_clean(ndev); 284e4f2379dSAlexey Brodkin 285e4f2379dSAlexey Brodkin work_done = arc_emac_rx(ndev, budget); 286e4f2379dSAlexey Brodkin if (work_done < budget) { 2876ad20165SEric Dumazet napi_complete_done(napi, work_done); 2887ce7679dSBeniamino Galvani arc_reg_or(priv, R_ENABLE, RXINT_MASK | TXINT_MASK); 289e4f2379dSAlexey Brodkin } 290e4f2379dSAlexey Brodkin 291e4f2379dSAlexey Brodkin return work_done; 292e4f2379dSAlexey Brodkin } 293e4f2379dSAlexey Brodkin 294e4f2379dSAlexey Brodkin /** 295e4f2379dSAlexey Brodkin * arc_emac_intr - Global interrupt handler for EMAC. 296e4f2379dSAlexey Brodkin * @irq: irq number. 297e4f2379dSAlexey Brodkin * @dev_instance: device instance. 298e4f2379dSAlexey Brodkin * 299e4f2379dSAlexey Brodkin * returns: IRQ_HANDLED for all cases. 300e4f2379dSAlexey Brodkin * 301e4f2379dSAlexey Brodkin * ARC EMAC has only 1 interrupt line, and depending on bits raised in 302e4f2379dSAlexey Brodkin * STATUS register we may tell what is a reason for interrupt to fire. 303e4f2379dSAlexey Brodkin */ 304e4f2379dSAlexey Brodkin static irqreturn_t arc_emac_intr(int irq, void *dev_instance) 305e4f2379dSAlexey Brodkin { 306e4f2379dSAlexey Brodkin struct net_device *ndev = dev_instance; 307e4f2379dSAlexey Brodkin struct arc_emac_priv *priv = netdev_priv(ndev); 308ff458f6fSTobias Klauser struct net_device_stats *stats = &ndev->stats; 309e4f2379dSAlexey Brodkin unsigned int status; 310e4f2379dSAlexey Brodkin 311e4f2379dSAlexey Brodkin status = arc_reg_get(priv, R_STATUS); 312e4f2379dSAlexey Brodkin status &= ~MDIO_MASK; 313e4f2379dSAlexey Brodkin 314e4f2379dSAlexey Brodkin /* Reset all flags except "MDIO complete" */ 315e4f2379dSAlexey Brodkin arc_reg_set(priv, R_STATUS, status); 316e4f2379dSAlexey Brodkin 3177ce7679dSBeniamino Galvani if (status & (RXINT_MASK | TXINT_MASK)) { 318e4f2379dSAlexey Brodkin if (likely(napi_schedule_prep(&priv->napi))) { 3197ce7679dSBeniamino Galvani arc_reg_clr(priv, R_ENABLE, RXINT_MASK | TXINT_MASK); 320e4f2379dSAlexey Brodkin __napi_schedule(&priv->napi); 321e4f2379dSAlexey Brodkin } 322e4f2379dSAlexey Brodkin } 323e4f2379dSAlexey Brodkin 324e4f2379dSAlexey Brodkin if (status & ERR_MASK) { 325e4f2379dSAlexey Brodkin /* MSER/RXCR/RXFR/RXFL interrupt fires on corresponding 326e4f2379dSAlexey Brodkin * 8-bit error counter overrun. 327e4f2379dSAlexey Brodkin */ 328e4f2379dSAlexey Brodkin 329e4f2379dSAlexey Brodkin if (status & MSER_MASK) { 330e4f2379dSAlexey Brodkin stats->rx_missed_errors += 0x100; 331e4f2379dSAlexey Brodkin stats->rx_errors += 0x100; 332e4f2379dSAlexey Brodkin } 333e4f2379dSAlexey Brodkin 334e4f2379dSAlexey Brodkin if (status & RXCR_MASK) { 335e4f2379dSAlexey Brodkin stats->rx_crc_errors += 0x100; 336e4f2379dSAlexey Brodkin stats->rx_errors += 0x100; 337e4f2379dSAlexey Brodkin } 338e4f2379dSAlexey Brodkin 339e4f2379dSAlexey Brodkin if (status & RXFR_MASK) { 340e4f2379dSAlexey Brodkin stats->rx_frame_errors += 0x100; 341e4f2379dSAlexey Brodkin stats->rx_errors += 0x100; 342e4f2379dSAlexey Brodkin } 343e4f2379dSAlexey Brodkin 344e4f2379dSAlexey Brodkin if (status & RXFL_MASK) { 345e4f2379dSAlexey Brodkin stats->rx_over_errors += 0x100; 346e4f2379dSAlexey Brodkin stats->rx_errors += 0x100; 347e4f2379dSAlexey Brodkin } 348e4f2379dSAlexey Brodkin } 349e4f2379dSAlexey Brodkin 350e4f2379dSAlexey Brodkin return IRQ_HANDLED; 351e4f2379dSAlexey Brodkin } 352e4f2379dSAlexey Brodkin 3535a45e57aSBeniamino Galvani #ifdef CONFIG_NET_POLL_CONTROLLER 3545a45e57aSBeniamino Galvani static void arc_emac_poll_controller(struct net_device *dev) 3555a45e57aSBeniamino Galvani { 3565a45e57aSBeniamino Galvani disable_irq(dev->irq); 3575a45e57aSBeniamino Galvani arc_emac_intr(dev->irq, dev); 3585a45e57aSBeniamino Galvani enable_irq(dev->irq); 3595a45e57aSBeniamino Galvani } 3605a45e57aSBeniamino Galvani #endif 3615a45e57aSBeniamino Galvani 362e4f2379dSAlexey Brodkin /** 363e4f2379dSAlexey Brodkin * arc_emac_open - Open the network device. 364e4f2379dSAlexey Brodkin * @ndev: Pointer to the network device. 365e4f2379dSAlexey Brodkin * 366e4f2379dSAlexey Brodkin * returns: 0, on success or non-zero error value on failure. 367e4f2379dSAlexey Brodkin * 368e4f2379dSAlexey Brodkin * This function sets the MAC address, requests and enables an IRQ 369e4f2379dSAlexey Brodkin * for the EMAC device and starts the Tx queue. 370e4f2379dSAlexey Brodkin * It also connects to the phy device. 371e4f2379dSAlexey Brodkin */ 372e4f2379dSAlexey Brodkin static int arc_emac_open(struct net_device *ndev) 373e4f2379dSAlexey Brodkin { 374e4f2379dSAlexey Brodkin struct arc_emac_priv *priv = netdev_priv(ndev); 37501dea536SPhilippe Reynes struct phy_device *phy_dev = ndev->phydev; 376e4f2379dSAlexey Brodkin int i; 377e4f2379dSAlexey Brodkin 378e4f2379dSAlexey Brodkin phy_dev->autoneg = AUTONEG_ENABLE; 379e4f2379dSAlexey Brodkin phy_dev->speed = 0; 380e4f2379dSAlexey Brodkin phy_dev->duplex = 0; 381b0ac9564SFlorian Fainelli phy_dev->advertising &= phy_dev->supported; 382e4f2379dSAlexey Brodkin 383a4a1139bSAlexey Brodkin priv->last_rx_bd = 0; 384a4a1139bSAlexey Brodkin 385e4f2379dSAlexey Brodkin /* Allocate and set buffers for Rx BD's */ 386e4f2379dSAlexey Brodkin for (i = 0; i < RX_BD_NUM; i++) { 387a4a1139bSAlexey Brodkin dma_addr_t addr; 388a4a1139bSAlexey Brodkin unsigned int *last_rx_bd = &priv->last_rx_bd; 389a4a1139bSAlexey Brodkin struct arc_emac_bd *rxbd = &priv->rxbd[*last_rx_bd]; 390a4a1139bSAlexey Brodkin struct buffer_state *rx_buff = &priv->rx_buff[*last_rx_bd]; 391a4a1139bSAlexey Brodkin 392a4a1139bSAlexey Brodkin rx_buff->skb = netdev_alloc_skb_ip_align(ndev, 393a4a1139bSAlexey Brodkin EMAC_BUFFER_SIZE); 394a4a1139bSAlexey Brodkin if (unlikely(!rx_buff->skb)) 395e4f2379dSAlexey Brodkin return -ENOMEM; 396e4f2379dSAlexey Brodkin 397a4a1139bSAlexey Brodkin addr = dma_map_single(&ndev->dev, (void *)rx_buff->skb->data, 398a4a1139bSAlexey Brodkin EMAC_BUFFER_SIZE, DMA_FROM_DEVICE); 399a4a1139bSAlexey Brodkin if (dma_mapping_error(&ndev->dev, addr)) { 400a4a1139bSAlexey Brodkin netdev_err(ndev, "cannot dma map\n"); 401a4a1139bSAlexey Brodkin dev_kfree_skb(rx_buff->skb); 402a4a1139bSAlexey Brodkin return -ENOMEM; 403a4a1139bSAlexey Brodkin } 404a4a1139bSAlexey Brodkin dma_unmap_addr_set(rx_buff, addr, addr); 405a4a1139bSAlexey Brodkin dma_unmap_len_set(rx_buff, len, EMAC_BUFFER_SIZE); 406a4a1139bSAlexey Brodkin 407a4a1139bSAlexey Brodkin rxbd->data = cpu_to_le32(addr); 408e4f2379dSAlexey Brodkin 409e4f2379dSAlexey Brodkin /* Make sure pointer to data buffer is set */ 410e4f2379dSAlexey Brodkin wmb(); 411e4f2379dSAlexey Brodkin 412a4a1139bSAlexey Brodkin /* Return ownership to EMAC */ 413a4a1139bSAlexey Brodkin rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE); 414e4f2379dSAlexey Brodkin 415a4a1139bSAlexey Brodkin *last_rx_bd = (*last_rx_bd + 1) % RX_BD_NUM; 416a4a1139bSAlexey Brodkin } 417e4f2379dSAlexey Brodkin 41899f93a15SAlexander Kochetkov priv->txbd_curr = 0; 41999f93a15SAlexander Kochetkov priv->txbd_dirty = 0; 42099f93a15SAlexander Kochetkov 421e4f2379dSAlexey Brodkin /* Clean Tx BD's */ 422e4f2379dSAlexey Brodkin memset(priv->txbd, 0, TX_RING_SZ); 423e4f2379dSAlexey Brodkin 424e4f2379dSAlexey Brodkin /* Initialize logical address filter */ 425e4f2379dSAlexey Brodkin arc_reg_set(priv, R_LAFL, 0); 426e4f2379dSAlexey Brodkin arc_reg_set(priv, R_LAFH, 0); 427e4f2379dSAlexey Brodkin 428e4f2379dSAlexey Brodkin /* Set BD ring pointers for device side */ 429e4f2379dSAlexey Brodkin arc_reg_set(priv, R_RX_RING, (unsigned int)priv->rxbd_dma); 430e4f2379dSAlexey Brodkin arc_reg_set(priv, R_TX_RING, (unsigned int)priv->txbd_dma); 431e4f2379dSAlexey Brodkin 432e4f2379dSAlexey Brodkin /* Enable interrupts */ 4337ce7679dSBeniamino Galvani arc_reg_set(priv, R_ENABLE, RXINT_MASK | TXINT_MASK | ERR_MASK); 434e4f2379dSAlexey Brodkin 435e4f2379dSAlexey Brodkin /* Set CONTROL */ 436e4f2379dSAlexey Brodkin arc_reg_set(priv, R_CTRL, 437e4f2379dSAlexey Brodkin (RX_BD_NUM << 24) | /* RX BD table length */ 438e4f2379dSAlexey Brodkin (TX_BD_NUM << 16) | /* TX BD table length */ 439e4f2379dSAlexey Brodkin TXRN_MASK | RXRN_MASK); 440e4f2379dSAlexey Brodkin 441e4f2379dSAlexey Brodkin napi_enable(&priv->napi); 442e4f2379dSAlexey Brodkin 443e4f2379dSAlexey Brodkin /* Enable EMAC */ 444e4f2379dSAlexey Brodkin arc_reg_or(priv, R_CTRL, EN_MASK); 445e4f2379dSAlexey Brodkin 446b18b7453SAlexander Kochetkov phy_start(ndev->phydev); 447e4f2379dSAlexey Brodkin 448e4f2379dSAlexey Brodkin netif_start_queue(ndev); 449e4f2379dSAlexey Brodkin 450e4f2379dSAlexey Brodkin return 0; 451e4f2379dSAlexey Brodkin } 452e4f2379dSAlexey Brodkin 453e4f2379dSAlexey Brodkin /** 454775dd682SBeniamino Galvani * arc_emac_set_rx_mode - Change the receive filtering mode. 455775dd682SBeniamino Galvani * @ndev: Pointer to the network device. 456775dd682SBeniamino Galvani * 457775dd682SBeniamino Galvani * This function enables/disables promiscuous or all-multicast mode 458775dd682SBeniamino Galvani * and updates the multicast filtering list of the network device. 459775dd682SBeniamino Galvani */ 460775dd682SBeniamino Galvani static void arc_emac_set_rx_mode(struct net_device *ndev) 461775dd682SBeniamino Galvani { 462775dd682SBeniamino Galvani struct arc_emac_priv *priv = netdev_priv(ndev); 463775dd682SBeniamino Galvani 464775dd682SBeniamino Galvani if (ndev->flags & IFF_PROMISC) { 465775dd682SBeniamino Galvani arc_reg_or(priv, R_CTRL, PROM_MASK); 466775dd682SBeniamino Galvani } else { 467775dd682SBeniamino Galvani arc_reg_clr(priv, R_CTRL, PROM_MASK); 468775dd682SBeniamino Galvani 469775dd682SBeniamino Galvani if (ndev->flags & IFF_ALLMULTI) { 470775dd682SBeniamino Galvani arc_reg_set(priv, R_LAFL, ~0); 471775dd682SBeniamino Galvani arc_reg_set(priv, R_LAFH, ~0); 472d0e3f65bSAlexander Kochetkov } else if (ndev->flags & IFF_MULTICAST) { 473775dd682SBeniamino Galvani struct netdev_hw_addr *ha; 474775dd682SBeniamino Galvani unsigned int filter[2] = { 0, 0 }; 475775dd682SBeniamino Galvani int bit; 476775dd682SBeniamino Galvani 477775dd682SBeniamino Galvani netdev_for_each_mc_addr(ha, ndev) { 478775dd682SBeniamino Galvani bit = ether_crc_le(ETH_ALEN, ha->addr) >> 26; 479775dd682SBeniamino Galvani filter[bit >> 5] |= 1 << (bit & 31); 480775dd682SBeniamino Galvani } 481775dd682SBeniamino Galvani 482775dd682SBeniamino Galvani arc_reg_set(priv, R_LAFL, filter[0]); 483775dd682SBeniamino Galvani arc_reg_set(priv, R_LAFH, filter[1]); 484d0e3f65bSAlexander Kochetkov } else { 485d0e3f65bSAlexander Kochetkov arc_reg_set(priv, R_LAFL, 0); 486d0e3f65bSAlexander Kochetkov arc_reg_set(priv, R_LAFH, 0); 487775dd682SBeniamino Galvani } 488775dd682SBeniamino Galvani } 489775dd682SBeniamino Galvani } 490775dd682SBeniamino Galvani 491775dd682SBeniamino Galvani /** 492b530b164SAlexander Kochetkov * arc_free_tx_queue - free skb from tx queue 493b530b164SAlexander Kochetkov * @ndev: Pointer to the network device. 494b530b164SAlexander Kochetkov * 495b530b164SAlexander Kochetkov * This function must be called while EMAC disable 496b530b164SAlexander Kochetkov */ 497b530b164SAlexander Kochetkov static void arc_free_tx_queue(struct net_device *ndev) 498b530b164SAlexander Kochetkov { 499b530b164SAlexander Kochetkov struct arc_emac_priv *priv = netdev_priv(ndev); 500b530b164SAlexander Kochetkov unsigned int i; 501b530b164SAlexander Kochetkov 502b530b164SAlexander Kochetkov for (i = 0; i < TX_BD_NUM; i++) { 503b530b164SAlexander Kochetkov struct arc_emac_bd *txbd = &priv->txbd[i]; 504b530b164SAlexander Kochetkov struct buffer_state *tx_buff = &priv->tx_buff[i]; 505b530b164SAlexander Kochetkov 506b530b164SAlexander Kochetkov if (tx_buff->skb) { 507663713ebSCaesar Wang dma_unmap_single(&ndev->dev, 508663713ebSCaesar Wang dma_unmap_addr(tx_buff, addr), 509663713ebSCaesar Wang dma_unmap_len(tx_buff, len), 510663713ebSCaesar Wang DMA_TO_DEVICE); 511b530b164SAlexander Kochetkov 512b530b164SAlexander Kochetkov /* return the sk_buff to system */ 513b530b164SAlexander Kochetkov dev_kfree_skb_irq(tx_buff->skb); 514b530b164SAlexander Kochetkov } 515b530b164SAlexander Kochetkov 516b530b164SAlexander Kochetkov txbd->info = 0; 517b530b164SAlexander Kochetkov txbd->data = 0; 518b530b164SAlexander Kochetkov tx_buff->skb = NULL; 519b530b164SAlexander Kochetkov } 520b530b164SAlexander Kochetkov } 521b530b164SAlexander Kochetkov 522b530b164SAlexander Kochetkov /** 523b530b164SAlexander Kochetkov * arc_free_rx_queue - free skb from rx queue 524b530b164SAlexander Kochetkov * @ndev: Pointer to the network device. 525b530b164SAlexander Kochetkov * 526b530b164SAlexander Kochetkov * This function must be called while EMAC disable 527b530b164SAlexander Kochetkov */ 528b530b164SAlexander Kochetkov static void arc_free_rx_queue(struct net_device *ndev) 529b530b164SAlexander Kochetkov { 530b530b164SAlexander Kochetkov struct arc_emac_priv *priv = netdev_priv(ndev); 531b530b164SAlexander Kochetkov unsigned int i; 532b530b164SAlexander Kochetkov 533b530b164SAlexander Kochetkov for (i = 0; i < RX_BD_NUM; i++) { 534b530b164SAlexander Kochetkov struct arc_emac_bd *rxbd = &priv->rxbd[i]; 535b530b164SAlexander Kochetkov struct buffer_state *rx_buff = &priv->rx_buff[i]; 536b530b164SAlexander Kochetkov 537b530b164SAlexander Kochetkov if (rx_buff->skb) { 538663713ebSCaesar Wang dma_unmap_single(&ndev->dev, 539663713ebSCaesar Wang dma_unmap_addr(rx_buff, addr), 540663713ebSCaesar Wang dma_unmap_len(rx_buff, len), 541663713ebSCaesar Wang DMA_FROM_DEVICE); 542b530b164SAlexander Kochetkov 543b530b164SAlexander Kochetkov /* return the sk_buff to system */ 544b530b164SAlexander Kochetkov dev_kfree_skb_irq(rx_buff->skb); 545b530b164SAlexander Kochetkov } 546b530b164SAlexander Kochetkov 547b530b164SAlexander Kochetkov rxbd->info = 0; 548b530b164SAlexander Kochetkov rxbd->data = 0; 549b530b164SAlexander Kochetkov rx_buff->skb = NULL; 550b530b164SAlexander Kochetkov } 551b530b164SAlexander Kochetkov } 552b530b164SAlexander Kochetkov 553b530b164SAlexander Kochetkov /** 554e4f2379dSAlexey Brodkin * arc_emac_stop - Close the network device. 555e4f2379dSAlexey Brodkin * @ndev: Pointer to the network device. 556e4f2379dSAlexey Brodkin * 557e4f2379dSAlexey Brodkin * This function stops the Tx queue, disables interrupts and frees the IRQ for 558e4f2379dSAlexey Brodkin * the EMAC device. 559e4f2379dSAlexey Brodkin * It also disconnects the PHY device associated with the EMAC device. 560e4f2379dSAlexey Brodkin */ 561e4f2379dSAlexey Brodkin static int arc_emac_stop(struct net_device *ndev) 562e4f2379dSAlexey Brodkin { 563e4f2379dSAlexey Brodkin struct arc_emac_priv *priv = netdev_priv(ndev); 564e4f2379dSAlexey Brodkin 565e4f2379dSAlexey Brodkin napi_disable(&priv->napi); 566e4f2379dSAlexey Brodkin netif_stop_queue(ndev); 567e4f2379dSAlexey Brodkin 568b18b7453SAlexander Kochetkov phy_stop(ndev->phydev); 569b18b7453SAlexander Kochetkov 570e4f2379dSAlexey Brodkin /* Disable interrupts */ 5717ce7679dSBeniamino Galvani arc_reg_clr(priv, R_ENABLE, RXINT_MASK | TXINT_MASK | ERR_MASK); 572e4f2379dSAlexey Brodkin 573e4f2379dSAlexey Brodkin /* Disable EMAC */ 574e4f2379dSAlexey Brodkin arc_reg_clr(priv, R_CTRL, EN_MASK); 575e4f2379dSAlexey Brodkin 576b530b164SAlexander Kochetkov /* Return the sk_buff to system */ 577b530b164SAlexander Kochetkov arc_free_tx_queue(ndev); 578b530b164SAlexander Kochetkov arc_free_rx_queue(ndev); 579b530b164SAlexander Kochetkov 580e4f2379dSAlexey Brodkin return 0; 581e4f2379dSAlexey Brodkin } 582e4f2379dSAlexey Brodkin 583e4f2379dSAlexey Brodkin /** 584e4f2379dSAlexey Brodkin * arc_emac_stats - Get system network statistics. 585e4f2379dSAlexey Brodkin * @ndev: Pointer to net_device structure. 586e4f2379dSAlexey Brodkin * 587e4f2379dSAlexey Brodkin * Returns the address of the device statistics structure. 588e4f2379dSAlexey Brodkin * Statistics are updated in interrupt handler. 589e4f2379dSAlexey Brodkin */ 590e4f2379dSAlexey Brodkin static struct net_device_stats *arc_emac_stats(struct net_device *ndev) 591e4f2379dSAlexey Brodkin { 592e4f2379dSAlexey Brodkin struct arc_emac_priv *priv = netdev_priv(ndev); 593ff458f6fSTobias Klauser struct net_device_stats *stats = &ndev->stats; 594e4f2379dSAlexey Brodkin unsigned long miss, rxerr; 595e4f2379dSAlexey Brodkin u8 rxcrc, rxfram, rxoflow; 596e4f2379dSAlexey Brodkin 597e4f2379dSAlexey Brodkin rxerr = arc_reg_get(priv, R_RXERR); 598e4f2379dSAlexey Brodkin miss = arc_reg_get(priv, R_MISS); 599e4f2379dSAlexey Brodkin 600e4f2379dSAlexey Brodkin rxcrc = rxerr; 601e4f2379dSAlexey Brodkin rxfram = rxerr >> 8; 602e4f2379dSAlexey Brodkin rxoflow = rxerr >> 16; 603e4f2379dSAlexey Brodkin 604e4f2379dSAlexey Brodkin stats->rx_errors += miss; 605e4f2379dSAlexey Brodkin stats->rx_errors += rxcrc + rxfram + rxoflow; 606e4f2379dSAlexey Brodkin 607e4f2379dSAlexey Brodkin stats->rx_over_errors += rxoflow; 608e4f2379dSAlexey Brodkin stats->rx_frame_errors += rxfram; 609e4f2379dSAlexey Brodkin stats->rx_crc_errors += rxcrc; 610e4f2379dSAlexey Brodkin stats->rx_missed_errors += miss; 611e4f2379dSAlexey Brodkin 612e4f2379dSAlexey Brodkin return stats; 613e4f2379dSAlexey Brodkin } 614e4f2379dSAlexey Brodkin 615e4f2379dSAlexey Brodkin /** 616e4f2379dSAlexey Brodkin * arc_emac_tx - Starts the data transmission. 617e4f2379dSAlexey Brodkin * @skb: sk_buff pointer that contains data to be Transmitted. 618e4f2379dSAlexey Brodkin * @ndev: Pointer to net_device structure. 619e4f2379dSAlexey Brodkin * 620e4f2379dSAlexey Brodkin * returns: NETDEV_TX_OK, on success 621e4f2379dSAlexey Brodkin * NETDEV_TX_BUSY, if any of the descriptors are not free. 622e4f2379dSAlexey Brodkin * 623e4f2379dSAlexey Brodkin * This function is invoked from upper layers to initiate transmission. 624e4f2379dSAlexey Brodkin */ 625e4f2379dSAlexey Brodkin static int arc_emac_tx(struct sk_buff *skb, struct net_device *ndev) 626e4f2379dSAlexey Brodkin { 627e4f2379dSAlexey Brodkin struct arc_emac_priv *priv = netdev_priv(ndev); 628e4f2379dSAlexey Brodkin unsigned int len, *txbd_curr = &priv->txbd_curr; 629ff458f6fSTobias Klauser struct net_device_stats *stats = &ndev->stats; 630e4f2379dSAlexey Brodkin __le32 *info = &priv->txbd[*txbd_curr].info; 631e4f2379dSAlexey Brodkin dma_addr_t addr; 632e4f2379dSAlexey Brodkin 633e4f2379dSAlexey Brodkin if (skb_padto(skb, ETH_ZLEN)) 634e4f2379dSAlexey Brodkin return NETDEV_TX_OK; 635e4f2379dSAlexey Brodkin 636e4f2379dSAlexey Brodkin len = max_t(unsigned int, ETH_ZLEN, skb->len); 637e4f2379dSAlexey Brodkin 63874dd40bcSBeniamino Galvani if (unlikely(!arc_emac_tx_avail(priv))) { 639e4f2379dSAlexey Brodkin netif_stop_queue(ndev); 64074dd40bcSBeniamino Galvani netdev_err(ndev, "BUG! Tx Ring full when queue awake!\n"); 641e4f2379dSAlexey Brodkin return NETDEV_TX_BUSY; 642e4f2379dSAlexey Brodkin } 643e4f2379dSAlexey Brodkin 644e4f2379dSAlexey Brodkin addr = dma_map_single(&ndev->dev, (void *)skb->data, len, 645e4f2379dSAlexey Brodkin DMA_TO_DEVICE); 646e4f2379dSAlexey Brodkin 647e4f2379dSAlexey Brodkin if (unlikely(dma_mapping_error(&ndev->dev, addr))) { 648e4f2379dSAlexey Brodkin stats->tx_dropped++; 649e4f2379dSAlexey Brodkin stats->tx_errors++; 6500f6e8761SWei Yongjun dev_kfree_skb_any(skb); 651e4f2379dSAlexey Brodkin return NETDEV_TX_OK; 652e4f2379dSAlexey Brodkin } 653a4a1139bSAlexey Brodkin dma_unmap_addr_set(&priv->tx_buff[*txbd_curr], addr, addr); 654e4f2379dSAlexey Brodkin dma_unmap_len_set(&priv->tx_buff[*txbd_curr], len, len); 655e4f2379dSAlexey Brodkin 656a4a1139bSAlexey Brodkin priv->txbd[*txbd_curr].data = cpu_to_le32(addr); 657e4f2379dSAlexey Brodkin 658e4f2379dSAlexey Brodkin /* Make sure pointer to data buffer is set */ 659e4f2379dSAlexey Brodkin wmb(); 660e4f2379dSAlexey Brodkin 66137ec274eSEric Dumazet skb_tx_timestamp(skb); 66237ec274eSEric Dumazet 663e4f2379dSAlexey Brodkin *info = cpu_to_le32(FOR_EMAC | FIRST_OR_LAST_MASK | len); 664e4f2379dSAlexey Brodkin 665c278c253SAlexander Kochetkov /* Make sure info word is set */ 666c278c253SAlexander Kochetkov wmb(); 667c278c253SAlexander Kochetkov 668c278c253SAlexander Kochetkov priv->tx_buff[*txbd_curr].skb = skb; 669c278c253SAlexander Kochetkov 670e4f2379dSAlexey Brodkin /* Increment index to point to the next BD */ 671e4f2379dSAlexey Brodkin *txbd_curr = (*txbd_curr + 1) % TX_BD_NUM; 672e4f2379dSAlexey Brodkin 67374dd40bcSBeniamino Galvani /* Ensure that tx_clean() sees the new txbd_curr before 67474dd40bcSBeniamino Galvani * checking the queue status. This prevents an unneeded wake 67574dd40bcSBeniamino Galvani * of the queue in tx_clean(). 67674dd40bcSBeniamino Galvani */ 67774dd40bcSBeniamino Galvani smp_mb(); 678e4f2379dSAlexey Brodkin 67974dd40bcSBeniamino Galvani if (!arc_emac_tx_avail(priv)) { 680e4f2379dSAlexey Brodkin netif_stop_queue(ndev); 68174dd40bcSBeniamino Galvani /* Refresh tx_dirty */ 68274dd40bcSBeniamino Galvani smp_mb(); 68374dd40bcSBeniamino Galvani if (arc_emac_tx_avail(priv)) 68474dd40bcSBeniamino Galvani netif_start_queue(ndev); 68574dd40bcSBeniamino Galvani } 686e4f2379dSAlexey Brodkin 687e4f2379dSAlexey Brodkin arc_reg_set(priv, R_STATUS, TXPL_MASK); 688e4f2379dSAlexey Brodkin 689e4f2379dSAlexey Brodkin return NETDEV_TX_OK; 690e4f2379dSAlexey Brodkin } 691e4f2379dSAlexey Brodkin 692235a251aSMax Schwarz static void arc_emac_set_address_internal(struct net_device *ndev) 693235a251aSMax Schwarz { 694235a251aSMax Schwarz struct arc_emac_priv *priv = netdev_priv(ndev); 695235a251aSMax Schwarz unsigned int addr_low, addr_hi; 696235a251aSMax Schwarz 697235a251aSMax Schwarz addr_low = le32_to_cpu(*(__le32 *)&ndev->dev_addr[0]); 698235a251aSMax Schwarz addr_hi = le16_to_cpu(*(__le16 *)&ndev->dev_addr[4]); 699235a251aSMax Schwarz 700235a251aSMax Schwarz arc_reg_set(priv, R_ADDRL, addr_low); 701235a251aSMax Schwarz arc_reg_set(priv, R_ADDRH, addr_hi); 702235a251aSMax Schwarz } 703235a251aSMax Schwarz 704e4f2379dSAlexey Brodkin /** 705e4f2379dSAlexey Brodkin * arc_emac_set_address - Set the MAC address for this device. 706e4f2379dSAlexey Brodkin * @ndev: Pointer to net_device structure. 707e4f2379dSAlexey Brodkin * @p: 6 byte Address to be written as MAC address. 708e4f2379dSAlexey Brodkin * 709e4f2379dSAlexey Brodkin * This function copies the HW address from the sockaddr structure to the 710e4f2379dSAlexey Brodkin * net_device structure and updates the address in HW. 711e4f2379dSAlexey Brodkin * 712e4f2379dSAlexey Brodkin * returns: -EBUSY if the net device is busy or 0 if the address is set 713e4f2379dSAlexey Brodkin * successfully. 714e4f2379dSAlexey Brodkin */ 715e4f2379dSAlexey Brodkin static int arc_emac_set_address(struct net_device *ndev, void *p) 716e4f2379dSAlexey Brodkin { 717e4f2379dSAlexey Brodkin struct sockaddr *addr = p; 718e4f2379dSAlexey Brodkin 719e4f2379dSAlexey Brodkin if (netif_running(ndev)) 720e4f2379dSAlexey Brodkin return -EBUSY; 721e4f2379dSAlexey Brodkin 722e4f2379dSAlexey Brodkin if (!is_valid_ether_addr(addr->sa_data)) 723e4f2379dSAlexey Brodkin return -EADDRNOTAVAIL; 724e4f2379dSAlexey Brodkin 725e4f2379dSAlexey Brodkin memcpy(ndev->dev_addr, addr->sa_data, ndev->addr_len); 726e4f2379dSAlexey Brodkin 727235a251aSMax Schwarz arc_emac_set_address_internal(ndev); 728e4f2379dSAlexey Brodkin 729e4f2379dSAlexey Brodkin return 0; 730e4f2379dSAlexey Brodkin } 731e4f2379dSAlexey Brodkin 732e11e8729SRomain Perier static int arc_emac_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) 733e11e8729SRomain Perier { 734e11e8729SRomain Perier if (!netif_running(dev)) 735e11e8729SRomain Perier return -EINVAL; 736e11e8729SRomain Perier 737e11e8729SRomain Perier if (!dev->phydev) 738e11e8729SRomain Perier return -ENODEV; 739e11e8729SRomain Perier 740e11e8729SRomain Perier return phy_mii_ioctl(dev->phydev, rq, cmd); 741e11e8729SRomain Perier } 742e11e8729SRomain Perier 743e11e8729SRomain Perier 744e4f2379dSAlexey Brodkin static const struct net_device_ops arc_emac_netdev_ops = { 745e4f2379dSAlexey Brodkin .ndo_open = arc_emac_open, 746e4f2379dSAlexey Brodkin .ndo_stop = arc_emac_stop, 747e4f2379dSAlexey Brodkin .ndo_start_xmit = arc_emac_tx, 748e4f2379dSAlexey Brodkin .ndo_set_mac_address = arc_emac_set_address, 749e4f2379dSAlexey Brodkin .ndo_get_stats = arc_emac_stats, 750775dd682SBeniamino Galvani .ndo_set_rx_mode = arc_emac_set_rx_mode, 751e11e8729SRomain Perier .ndo_do_ioctl = arc_emac_ioctl, 7525a45e57aSBeniamino Galvani #ifdef CONFIG_NET_POLL_CONTROLLER 7535a45e57aSBeniamino Galvani .ndo_poll_controller = arc_emac_poll_controller, 7545a45e57aSBeniamino Galvani #endif 755e4f2379dSAlexey Brodkin }; 756e4f2379dSAlexey Brodkin 75723d2d9a6SRomain Perier int arc_emac_probe(struct net_device *ndev, int interface) 758e4f2379dSAlexey Brodkin { 75923d2d9a6SRomain Perier struct device *dev = ndev->dev.parent; 760f7578496SThierry Reding struct resource res_regs; 761e4f2379dSAlexey Brodkin struct device_node *phy_node; 76201dea536SPhilippe Reynes struct phy_device *phydev = NULL; 763e4f2379dSAlexey Brodkin struct arc_emac_priv *priv; 764e4f2379dSAlexey Brodkin const char *mac_addr; 765f7578496SThierry Reding unsigned int id, clock_frequency, irq; 766e4f2379dSAlexey Brodkin int err; 767e4f2379dSAlexey Brodkin 768e4f2379dSAlexey Brodkin /* Get PHY from device tree */ 769f15f44e0SRomain Perier phy_node = of_parse_phandle(dev->of_node, "phy", 0); 770e4f2379dSAlexey Brodkin if (!phy_node) { 771f15f44e0SRomain Perier dev_err(dev, "failed to retrieve phy description from device tree\n"); 772e4f2379dSAlexey Brodkin return -ENODEV; 773e4f2379dSAlexey Brodkin } 774e4f2379dSAlexey Brodkin 775e4f2379dSAlexey Brodkin /* Get EMAC registers base address from device tree */ 776f15f44e0SRomain Perier err = of_address_to_resource(dev->of_node, 0, &res_regs); 777e4f2379dSAlexey Brodkin if (err) { 778f15f44e0SRomain Perier dev_err(dev, "failed to retrieve registers base from device tree\n"); 779a94efbd7SPeter Chen err = -ENODEV; 780a94efbd7SPeter Chen goto out_put_node; 781e4f2379dSAlexey Brodkin } 782e4f2379dSAlexey Brodkin 783e4f2379dSAlexey Brodkin /* Get IRQ from device tree */ 784f15f44e0SRomain Perier irq = irq_of_parse_and_map(dev->of_node, 0); 785f7578496SThierry Reding if (!irq) { 786f15f44e0SRomain Perier dev_err(dev, "failed to retrieve <irq> value from device tree\n"); 787a94efbd7SPeter Chen err = -ENODEV; 788a94efbd7SPeter Chen goto out_put_node; 789e4f2379dSAlexey Brodkin } 790e4f2379dSAlexey Brodkin 791e4f2379dSAlexey Brodkin ndev->netdev_ops = &arc_emac_netdev_ops; 792e4f2379dSAlexey Brodkin ndev->ethtool_ops = &arc_emac_ethtool_ops; 793e4f2379dSAlexey Brodkin ndev->watchdog_timeo = TX_TIMEOUT; 794e4f2379dSAlexey Brodkin 795e4f2379dSAlexey Brodkin priv = netdev_priv(ndev); 796f15f44e0SRomain Perier priv->dev = dev; 797e4f2379dSAlexey Brodkin 798f15f44e0SRomain Perier priv->regs = devm_ioremap_resource(dev, &res_regs); 79954447f1aSWei Yongjun if (IS_ERR(priv->regs)) { 80054447f1aSWei Yongjun err = PTR_ERR(priv->regs); 80154447f1aSWei Yongjun goto out_put_node; 80254447f1aSWei Yongjun } 803663713ebSCaesar Wang 804f15f44e0SRomain Perier dev_dbg(dev, "Registers base address is 0x%p\n", priv->regs); 805e4f2379dSAlexey Brodkin 80623d2d9a6SRomain Perier if (priv->clk) { 80723d2d9a6SRomain Perier err = clk_prepare_enable(priv->clk); 80823d2d9a6SRomain Perier if (err) { 80923d2d9a6SRomain Perier dev_err(dev, "failed to enable clock\n"); 810a94efbd7SPeter Chen goto out_put_node; 81123d2d9a6SRomain Perier } 81223d2d9a6SRomain Perier 81323d2d9a6SRomain Perier clock_frequency = clk_get_rate(priv->clk); 81423d2d9a6SRomain Perier } else { 81588154c96SHeiko Stübner /* Get CPU clock frequency from device tree */ 816f15f44e0SRomain Perier if (of_property_read_u32(dev->of_node, "clock-frequency", 81788154c96SHeiko Stübner &clock_frequency)) { 818f15f44e0SRomain Perier dev_err(dev, "failed to retrieve <clock-frequency> from device tree\n"); 819a94efbd7SPeter Chen err = -EINVAL; 820a94efbd7SPeter Chen goto out_put_node; 82188154c96SHeiko Stübner } 82288154c96SHeiko Stübner } 82388154c96SHeiko Stübner 824e4f2379dSAlexey Brodkin id = arc_reg_get(priv, R_ID); 825e4f2379dSAlexey Brodkin 826e4f2379dSAlexey Brodkin /* Check for EMAC revision 5 or 7, magic number */ 827e4f2379dSAlexey Brodkin if (!(id == 0x0005fd02 || id == 0x0007fd02)) { 828f15f44e0SRomain Perier dev_err(dev, "ARC EMAC not detected, id=0x%x\n", id); 829e4f2379dSAlexey Brodkin err = -ENODEV; 83088154c96SHeiko Stübner goto out_clken; 831e4f2379dSAlexey Brodkin } 832f15f44e0SRomain Perier dev_info(dev, "ARC EMAC detected with id: 0x%x\n", id); 833e4f2379dSAlexey Brodkin 834e4f2379dSAlexey Brodkin /* Set poll rate so that it polls every 1 ms */ 835e4f2379dSAlexey Brodkin arc_reg_set(priv, R_POLLRATE, clock_frequency / 1000000); 836e4f2379dSAlexey Brodkin 837f7578496SThierry Reding ndev->irq = irq; 838f15f44e0SRomain Perier dev_info(dev, "IRQ is %d\n", ndev->irq); 839e4f2379dSAlexey Brodkin 840e4f2379dSAlexey Brodkin /* Register interrupt handler for device */ 841f15f44e0SRomain Perier err = devm_request_irq(dev, ndev->irq, arc_emac_intr, 0, 842e4f2379dSAlexey Brodkin ndev->name, ndev); 843e4f2379dSAlexey Brodkin if (err) { 844f15f44e0SRomain Perier dev_err(dev, "could not allocate IRQ\n"); 84588154c96SHeiko Stübner goto out_clken; 846e4f2379dSAlexey Brodkin } 847e4f2379dSAlexey Brodkin 848e4f2379dSAlexey Brodkin /* Get MAC address from device tree */ 849f15f44e0SRomain Perier mac_addr = of_get_mac_address(dev->of_node); 850e4f2379dSAlexey Brodkin 85199470819SLuka Perkov if (mac_addr) 852e4f2379dSAlexey Brodkin memcpy(ndev->dev_addr, mac_addr, ETH_ALEN); 85399470819SLuka Perkov else 85499470819SLuka Perkov eth_hw_addr_random(ndev); 855e4f2379dSAlexey Brodkin 856235a251aSMax Schwarz arc_emac_set_address_internal(ndev); 857f15f44e0SRomain Perier dev_info(dev, "MAC address is now %pM\n", ndev->dev_addr); 858e4f2379dSAlexey Brodkin 859e4f2379dSAlexey Brodkin /* Do 1 allocation instead of 2 separate ones for Rx and Tx BD rings */ 860f15f44e0SRomain Perier priv->rxbd = dmam_alloc_coherent(dev, RX_RING_SZ + TX_RING_SZ, 861e4f2379dSAlexey Brodkin &priv->rxbd_dma, GFP_KERNEL); 862e4f2379dSAlexey Brodkin 863e4f2379dSAlexey Brodkin if (!priv->rxbd) { 864f15f44e0SRomain Perier dev_err(dev, "failed to allocate data buffers\n"); 865e4f2379dSAlexey Brodkin err = -ENOMEM; 86688154c96SHeiko Stübner goto out_clken; 867e4f2379dSAlexey Brodkin } 868e4f2379dSAlexey Brodkin 869e4f2379dSAlexey Brodkin priv->txbd = priv->rxbd + RX_BD_NUM; 870e4f2379dSAlexey Brodkin 871e4f2379dSAlexey Brodkin priv->txbd_dma = priv->rxbd_dma + RX_RING_SZ; 872f15f44e0SRomain Perier dev_dbg(dev, "EMAC Device addr: Rx Ring [0x%x], Tx Ring[%x]\n", 873e4f2379dSAlexey Brodkin (unsigned int)priv->rxbd_dma, (unsigned int)priv->txbd_dma); 874e4f2379dSAlexey Brodkin 87593e91b3dSRomain Perier err = arc_mdio_probe(priv); 876e4f2379dSAlexey Brodkin if (err) { 877f15f44e0SRomain Perier dev_err(dev, "failed to probe MII bus\n"); 87888154c96SHeiko Stübner goto out_clken; 879e4f2379dSAlexey Brodkin } 880e4f2379dSAlexey Brodkin 88101dea536SPhilippe Reynes phydev = of_phy_connect(ndev, phy_node, arc_emac_adjust_link, 0, 88223d2d9a6SRomain Perier interface); 88301dea536SPhilippe Reynes if (!phydev) { 884f15f44e0SRomain Perier dev_err(dev, "of_phy_connect() failed\n"); 885e4f2379dSAlexey Brodkin err = -ENODEV; 886796bec1eSHeiko Stübner goto out_mdio; 887e4f2379dSAlexey Brodkin } 888e4f2379dSAlexey Brodkin 889f15f44e0SRomain Perier dev_info(dev, "connected to %s phy with id 0x%x\n", 89001dea536SPhilippe Reynes phydev->drv->name, phydev->phy_id); 891e4f2379dSAlexey Brodkin 892e4f2379dSAlexey Brodkin netif_napi_add(ndev, &priv->napi, arc_emac_poll, ARC_EMAC_NAPI_WEIGHT); 893e4f2379dSAlexey Brodkin 894e4f2379dSAlexey Brodkin err = register_netdev(ndev); 895e4f2379dSAlexey Brodkin if (err) { 896f15f44e0SRomain Perier dev_err(dev, "failed to register network device\n"); 897796bec1eSHeiko Stübner goto out_netif_api; 898e4f2379dSAlexey Brodkin } 899e4f2379dSAlexey Brodkin 900a94efbd7SPeter Chen of_node_put(phy_node); 901e4f2379dSAlexey Brodkin return 0; 902e4f2379dSAlexey Brodkin 903796bec1eSHeiko Stübner out_netif_api: 904796bec1eSHeiko Stübner netif_napi_del(&priv->napi); 90501dea536SPhilippe Reynes phy_disconnect(phydev); 906796bec1eSHeiko Stübner out_mdio: 907796bec1eSHeiko Stübner arc_mdio_remove(priv); 90888154c96SHeiko Stübner out_clken: 90923d2d9a6SRomain Perier if (priv->clk) 91088154c96SHeiko Stübner clk_disable_unprepare(priv->clk); 911a94efbd7SPeter Chen out_put_node: 912a94efbd7SPeter Chen of_node_put(phy_node); 913a94efbd7SPeter Chen 914e4f2379dSAlexey Brodkin return err; 915e4f2379dSAlexey Brodkin } 91623d2d9a6SRomain Perier EXPORT_SYMBOL_GPL(arc_emac_probe); 917e4f2379dSAlexey Brodkin 91823d2d9a6SRomain Perier int arc_emac_remove(struct net_device *ndev) 919e4f2379dSAlexey Brodkin { 920e4f2379dSAlexey Brodkin struct arc_emac_priv *priv = netdev_priv(ndev); 921e4f2379dSAlexey Brodkin 92201dea536SPhilippe Reynes phy_disconnect(ndev->phydev); 923e4f2379dSAlexey Brodkin arc_mdio_remove(priv); 924e4f2379dSAlexey Brodkin unregister_netdev(ndev); 925e4f2379dSAlexey Brodkin netif_napi_del(&priv->napi); 92688154c96SHeiko Stübner 927663713ebSCaesar Wang if (!IS_ERR(priv->clk)) 92888154c96SHeiko Stübner clk_disable_unprepare(priv->clk); 929e4f2379dSAlexey Brodkin 930e4f2379dSAlexey Brodkin return 0; 931e4f2379dSAlexey Brodkin } 93223d2d9a6SRomain Perier EXPORT_SYMBOL_GPL(arc_emac_remove); 933e4f2379dSAlexey Brodkin 934e4f2379dSAlexey Brodkin MODULE_AUTHOR("Alexey Brodkin <abrodkin@synopsys.com>"); 935e4f2379dSAlexey Brodkin MODULE_DESCRIPTION("ARC EMAC driver"); 936e4f2379dSAlexey Brodkin MODULE_LICENSE("GPL"); 937