Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2004-2013 Synopsys, Inc. (www.synopsys.com) |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 as |
| 6 | * published by the Free Software Foundation. |
| 7 | * |
| 8 | * Driver for the ARC EMAC 10100 (hardware revision 5) |
| 9 | * |
| 10 | * Contributors: |
| 11 | * Amit Bhor |
| 12 | * Sameer Dhavale |
| 13 | * Vineet Gupta |
| 14 | */ |
| 15 | |
Beniamino Galvani | 775dd68 | 2014-05-11 18:11:47 +0200 | [diff] [blame] | 16 | #include <linux/crc32.h> |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 17 | #include <linux/etherdevice.h> |
| 18 | #include <linux/interrupt.h> |
| 19 | #include <linux/io.h> |
| 20 | #include <linux/module.h> |
| 21 | #include <linux/of_address.h> |
| 22 | #include <linux/of_irq.h> |
| 23 | #include <linux/of_mdio.h> |
| 24 | #include <linux/of_net.h> |
| 25 | #include <linux/of_platform.h> |
| 26 | |
| 27 | #include "emac.h" |
| 28 | |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 29 | |
| 30 | /** |
Beniamino Galvani | 74dd40b | 2014-09-10 22:50:03 +0200 | [diff] [blame] | 31 | * arc_emac_tx_avail - Return the number of available slots in the tx ring. |
| 32 | * @priv: Pointer to ARC EMAC private data structure. |
| 33 | * |
| 34 | * returns: the number of slots available for transmission in tx the ring. |
| 35 | */ |
| 36 | static inline int arc_emac_tx_avail(struct arc_emac_priv *priv) |
| 37 | { |
| 38 | return (priv->txbd_dirty + TX_BD_NUM - priv->txbd_curr - 1) % TX_BD_NUM; |
| 39 | } |
| 40 | |
| 41 | /** |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 42 | * arc_emac_adjust_link - Adjust the PHY link duplex. |
| 43 | * @ndev: Pointer to the net_device structure. |
| 44 | * |
| 45 | * This function is called to change the duplex setting after auto negotiation |
| 46 | * is done by the PHY. |
| 47 | */ |
| 48 | static void arc_emac_adjust_link(struct net_device *ndev) |
| 49 | { |
| 50 | struct arc_emac_priv *priv = netdev_priv(ndev); |
| 51 | struct phy_device *phy_dev = priv->phy_dev; |
| 52 | unsigned int reg, state_changed = 0; |
| 53 | |
| 54 | if (priv->link != phy_dev->link) { |
| 55 | priv->link = phy_dev->link; |
| 56 | state_changed = 1; |
| 57 | } |
| 58 | |
| 59 | if (priv->speed != phy_dev->speed) { |
| 60 | priv->speed = phy_dev->speed; |
| 61 | state_changed = 1; |
Romain Perier | 6eacf31 | 2014-09-08 17:14:47 +0000 | [diff] [blame] | 62 | if (priv->set_mac_speed) |
| 63 | priv->set_mac_speed(priv, priv->speed); |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 64 | } |
| 65 | |
| 66 | if (priv->duplex != phy_dev->duplex) { |
| 67 | reg = arc_reg_get(priv, R_CTRL); |
| 68 | |
| 69 | if (DUPLEX_FULL == phy_dev->duplex) |
| 70 | reg |= ENFL_MASK; |
| 71 | else |
| 72 | reg &= ~ENFL_MASK; |
| 73 | |
| 74 | arc_reg_set(priv, R_CTRL, reg); |
| 75 | priv->duplex = phy_dev->duplex; |
| 76 | state_changed = 1; |
| 77 | } |
| 78 | |
| 79 | if (state_changed) |
| 80 | phy_print_status(phy_dev); |
| 81 | } |
| 82 | |
| 83 | /** |
| 84 | * arc_emac_get_settings - Get PHY settings. |
| 85 | * @ndev: Pointer to net_device structure. |
| 86 | * @cmd: Pointer to ethtool_cmd structure. |
| 87 | * |
| 88 | * This implements ethtool command for getting PHY settings. If PHY could |
| 89 | * not be found, the function returns -ENODEV. This function calls the |
| 90 | * relevant PHY ethtool API to get the PHY settings. |
| 91 | * Issue "ethtool ethX" under linux prompt to execute this function. |
| 92 | */ |
| 93 | static int arc_emac_get_settings(struct net_device *ndev, |
| 94 | struct ethtool_cmd *cmd) |
| 95 | { |
| 96 | struct arc_emac_priv *priv = netdev_priv(ndev); |
| 97 | |
| 98 | return phy_ethtool_gset(priv->phy_dev, cmd); |
| 99 | } |
| 100 | |
| 101 | /** |
| 102 | * arc_emac_set_settings - Set PHY settings as passed in the argument. |
| 103 | * @ndev: Pointer to net_device structure. |
| 104 | * @cmd: Pointer to ethtool_cmd structure. |
| 105 | * |
| 106 | * This implements ethtool command for setting various PHY settings. If PHY |
| 107 | * could not be found, the function returns -ENODEV. This function calls the |
| 108 | * relevant PHY ethtool API to set the PHY. |
| 109 | * Issue e.g. "ethtool -s ethX speed 1000" under linux prompt to execute this |
| 110 | * function. |
| 111 | */ |
| 112 | static int arc_emac_set_settings(struct net_device *ndev, |
| 113 | struct ethtool_cmd *cmd) |
| 114 | { |
| 115 | struct arc_emac_priv *priv = netdev_priv(ndev); |
| 116 | |
| 117 | if (!capable(CAP_NET_ADMIN)) |
| 118 | return -EPERM; |
| 119 | |
| 120 | return phy_ethtool_sset(priv->phy_dev, cmd); |
| 121 | } |
| 122 | |
| 123 | /** |
| 124 | * arc_emac_get_drvinfo - Get EMAC driver information. |
| 125 | * @ndev: Pointer to net_device structure. |
| 126 | * @info: Pointer to ethtool_drvinfo structure. |
| 127 | * |
| 128 | * This implements ethtool command for getting the driver information. |
| 129 | * Issue "ethtool -i ethX" under linux prompt to execute this function. |
| 130 | */ |
| 131 | static void arc_emac_get_drvinfo(struct net_device *ndev, |
| 132 | struct ethtool_drvinfo *info) |
| 133 | { |
Romain Perier | 23d2d9a | 2014-08-26 13:14:51 +0000 | [diff] [blame] | 134 | struct arc_emac_priv *priv = netdev_priv(ndev); |
| 135 | |
| 136 | strlcpy(info->driver, priv->drv_name, sizeof(info->driver)); |
| 137 | strlcpy(info->version, priv->drv_version, sizeof(info->version)); |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 138 | } |
| 139 | |
| 140 | static const struct ethtool_ops arc_emac_ethtool_ops = { |
| 141 | .get_settings = arc_emac_get_settings, |
| 142 | .set_settings = arc_emac_set_settings, |
| 143 | .get_drvinfo = arc_emac_get_drvinfo, |
| 144 | .get_link = ethtool_op_get_link, |
| 145 | }; |
| 146 | |
| 147 | #define FIRST_OR_LAST_MASK (FIRST_MASK | LAST_MASK) |
| 148 | |
| 149 | /** |
| 150 | * arc_emac_tx_clean - clears processed by EMAC Tx BDs. |
| 151 | * @ndev: Pointer to the network device. |
| 152 | */ |
| 153 | static void arc_emac_tx_clean(struct net_device *ndev) |
| 154 | { |
| 155 | struct arc_emac_priv *priv = netdev_priv(ndev); |
Tobias Klauser | ff458f6 | 2014-07-09 11:07:37 +0200 | [diff] [blame] | 156 | struct net_device_stats *stats = &ndev->stats; |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 157 | unsigned int i; |
| 158 | |
| 159 | for (i = 0; i < TX_BD_NUM; i++) { |
| 160 | unsigned int *txbd_dirty = &priv->txbd_dirty; |
| 161 | struct arc_emac_bd *txbd = &priv->txbd[*txbd_dirty]; |
| 162 | struct buffer_state *tx_buff = &priv->tx_buff[*txbd_dirty]; |
| 163 | struct sk_buff *skb = tx_buff->skb; |
| 164 | unsigned int info = le32_to_cpu(txbd->info); |
| 165 | |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 166 | if ((info & FOR_EMAC) || !txbd->data) |
| 167 | break; |
| 168 | |
| 169 | if (unlikely(info & (DROP | DEFR | LTCL | UFLO))) { |
| 170 | stats->tx_errors++; |
| 171 | stats->tx_dropped++; |
| 172 | |
| 173 | if (info & DEFR) |
| 174 | stats->tx_carrier_errors++; |
| 175 | |
| 176 | if (info & LTCL) |
| 177 | stats->collisions++; |
| 178 | |
| 179 | if (info & UFLO) |
| 180 | stats->tx_fifo_errors++; |
| 181 | } else if (likely(info & FIRST_OR_LAST_MASK)) { |
| 182 | stats->tx_packets++; |
| 183 | stats->tx_bytes += skb->len; |
| 184 | } |
| 185 | |
Alexey Brodkin | a4a1139 | 2013-06-26 11:49:26 +0400 | [diff] [blame] | 186 | dma_unmap_single(&ndev->dev, dma_unmap_addr(tx_buff, addr), |
| 187 | dma_unmap_len(tx_buff, len), DMA_TO_DEVICE); |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 188 | |
| 189 | /* return the sk_buff to system */ |
| 190 | dev_kfree_skb_irq(skb); |
| 191 | |
| 192 | txbd->data = 0; |
| 193 | txbd->info = 0; |
| 194 | |
Vineet Gupta | 27082ee | 2013-09-04 17:17:15 +0530 | [diff] [blame] | 195 | *txbd_dirty = (*txbd_dirty + 1) % TX_BD_NUM; |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 196 | } |
Beniamino Galvani | 74dd40b | 2014-09-10 22:50:03 +0200 | [diff] [blame] | 197 | |
| 198 | /* Ensure that txbd_dirty is visible to tx() before checking |
| 199 | * for queue stopped. |
| 200 | */ |
| 201 | smp_mb(); |
| 202 | |
| 203 | if (netif_queue_stopped(ndev) && arc_emac_tx_avail(priv)) |
| 204 | netif_wake_queue(ndev); |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 205 | } |
| 206 | |
| 207 | /** |
| 208 | * arc_emac_rx - processing of Rx packets. |
| 209 | * @ndev: Pointer to the network device. |
| 210 | * @budget: How many BDs to process on 1 call. |
| 211 | * |
| 212 | * returns: Number of processed BDs |
| 213 | * |
| 214 | * Iterate through Rx BDs and deliver received packages to upper layer. |
| 215 | */ |
| 216 | static int arc_emac_rx(struct net_device *ndev, int budget) |
| 217 | { |
| 218 | struct arc_emac_priv *priv = netdev_priv(ndev); |
| 219 | unsigned int work_done; |
| 220 | |
Alexey Brodkin | 9cff866 | 2013-08-13 17:04:36 +0400 | [diff] [blame] | 221 | for (work_done = 0; work_done < budget; work_done++) { |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 222 | unsigned int *last_rx_bd = &priv->last_rx_bd; |
Tobias Klauser | ff458f6 | 2014-07-09 11:07:37 +0200 | [diff] [blame] | 223 | struct net_device_stats *stats = &ndev->stats; |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 224 | struct buffer_state *rx_buff = &priv->rx_buff[*last_rx_bd]; |
| 225 | struct arc_emac_bd *rxbd = &priv->rxbd[*last_rx_bd]; |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 226 | unsigned int pktlen, info = le32_to_cpu(rxbd->info); |
| 227 | struct sk_buff *skb; |
| 228 | dma_addr_t addr; |
| 229 | |
| 230 | if (unlikely((info & OWN_MASK) == FOR_EMAC)) |
| 231 | break; |
| 232 | |
| 233 | /* Make a note that we saw a packet at this BD. |
| 234 | * So next time, driver starts from this + 1 |
| 235 | */ |
| 236 | *last_rx_bd = (*last_rx_bd + 1) % RX_BD_NUM; |
| 237 | |
| 238 | if (unlikely((info & FIRST_OR_LAST_MASK) != |
| 239 | FIRST_OR_LAST_MASK)) { |
| 240 | /* We pre-allocate buffers of MTU size so incoming |
| 241 | * packets won't be split/chained. |
| 242 | */ |
| 243 | if (net_ratelimit()) |
| 244 | netdev_err(ndev, "incomplete packet received\n"); |
| 245 | |
| 246 | /* Return ownership to EMAC */ |
Alexey Brodkin | a4a1139 | 2013-06-26 11:49:26 +0400 | [diff] [blame] | 247 | rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE); |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 248 | stats->rx_errors++; |
| 249 | stats->rx_length_errors++; |
| 250 | continue; |
| 251 | } |
| 252 | |
| 253 | pktlen = info & LEN_MASK; |
| 254 | stats->rx_packets++; |
| 255 | stats->rx_bytes += pktlen; |
| 256 | skb = rx_buff->skb; |
| 257 | skb_put(skb, pktlen); |
| 258 | skb->dev = ndev; |
| 259 | skb->protocol = eth_type_trans(skb, ndev); |
| 260 | |
Alexey Brodkin | a4a1139 | 2013-06-26 11:49:26 +0400 | [diff] [blame] | 261 | dma_unmap_single(&ndev->dev, dma_unmap_addr(rx_buff, addr), |
| 262 | dma_unmap_len(rx_buff, len), DMA_FROM_DEVICE); |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 263 | |
| 264 | /* Prepare the BD for next cycle */ |
Alexey Brodkin | a4a1139 | 2013-06-26 11:49:26 +0400 | [diff] [blame] | 265 | rx_buff->skb = netdev_alloc_skb_ip_align(ndev, |
| 266 | EMAC_BUFFER_SIZE); |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 267 | if (unlikely(!rx_buff->skb)) { |
| 268 | stats->rx_errors++; |
| 269 | /* Because receive_skb is below, increment rx_dropped */ |
| 270 | stats->rx_dropped++; |
| 271 | continue; |
| 272 | } |
| 273 | |
| 274 | /* receive_skb only if new skb was allocated to avoid holes */ |
| 275 | netif_receive_skb(skb); |
| 276 | |
| 277 | addr = dma_map_single(&ndev->dev, (void *)rx_buff->skb->data, |
Alexey Brodkin | a4a1139 | 2013-06-26 11:49:26 +0400 | [diff] [blame] | 278 | EMAC_BUFFER_SIZE, DMA_FROM_DEVICE); |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 279 | if (dma_mapping_error(&ndev->dev, addr)) { |
| 280 | if (net_ratelimit()) |
| 281 | netdev_err(ndev, "cannot dma map\n"); |
| 282 | dev_kfree_skb(rx_buff->skb); |
| 283 | stats->rx_errors++; |
| 284 | continue; |
| 285 | } |
Alexey Brodkin | a4a1139 | 2013-06-26 11:49:26 +0400 | [diff] [blame] | 286 | dma_unmap_addr_set(rx_buff, addr, addr); |
| 287 | dma_unmap_len_set(rx_buff, len, EMAC_BUFFER_SIZE); |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 288 | |
Alexey Brodkin | a4a1139 | 2013-06-26 11:49:26 +0400 | [diff] [blame] | 289 | rxbd->data = cpu_to_le32(addr); |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 290 | |
| 291 | /* Make sure pointer to data buffer is set */ |
| 292 | wmb(); |
| 293 | |
| 294 | /* Return ownership to EMAC */ |
Alexey Brodkin | a4a1139 | 2013-06-26 11:49:26 +0400 | [diff] [blame] | 295 | rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE); |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 296 | } |
| 297 | |
| 298 | return work_done; |
| 299 | } |
| 300 | |
| 301 | /** |
| 302 | * arc_emac_poll - NAPI poll handler. |
| 303 | * @napi: Pointer to napi_struct structure. |
| 304 | * @budget: How many BDs to process on 1 call. |
| 305 | * |
| 306 | * returns: Number of processed BDs |
| 307 | */ |
| 308 | static int arc_emac_poll(struct napi_struct *napi, int budget) |
| 309 | { |
| 310 | struct net_device *ndev = napi->dev; |
| 311 | struct arc_emac_priv *priv = netdev_priv(ndev); |
| 312 | unsigned int work_done; |
| 313 | |
| 314 | arc_emac_tx_clean(ndev); |
| 315 | |
| 316 | work_done = arc_emac_rx(ndev, budget); |
| 317 | if (work_done < budget) { |
| 318 | napi_complete(napi); |
Beniamino Galvani | 7ce7679 | 2014-09-10 22:50:02 +0200 | [diff] [blame] | 319 | arc_reg_or(priv, R_ENABLE, RXINT_MASK | TXINT_MASK); |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 320 | } |
| 321 | |
| 322 | return work_done; |
| 323 | } |
| 324 | |
| 325 | /** |
| 326 | * arc_emac_intr - Global interrupt handler for EMAC. |
| 327 | * @irq: irq number. |
| 328 | * @dev_instance: device instance. |
| 329 | * |
| 330 | * returns: IRQ_HANDLED for all cases. |
| 331 | * |
| 332 | * ARC EMAC has only 1 interrupt line, and depending on bits raised in |
| 333 | * STATUS register we may tell what is a reason for interrupt to fire. |
| 334 | */ |
| 335 | static irqreturn_t arc_emac_intr(int irq, void *dev_instance) |
| 336 | { |
| 337 | struct net_device *ndev = dev_instance; |
| 338 | struct arc_emac_priv *priv = netdev_priv(ndev); |
Tobias Klauser | ff458f6 | 2014-07-09 11:07:37 +0200 | [diff] [blame] | 339 | struct net_device_stats *stats = &ndev->stats; |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 340 | unsigned int status; |
| 341 | |
| 342 | status = arc_reg_get(priv, R_STATUS); |
| 343 | status &= ~MDIO_MASK; |
| 344 | |
| 345 | /* Reset all flags except "MDIO complete" */ |
| 346 | arc_reg_set(priv, R_STATUS, status); |
| 347 | |
Beniamino Galvani | 7ce7679 | 2014-09-10 22:50:02 +0200 | [diff] [blame] | 348 | if (status & (RXINT_MASK | TXINT_MASK)) { |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 349 | if (likely(napi_schedule_prep(&priv->napi))) { |
Beniamino Galvani | 7ce7679 | 2014-09-10 22:50:02 +0200 | [diff] [blame] | 350 | arc_reg_clr(priv, R_ENABLE, RXINT_MASK | TXINT_MASK); |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 351 | __napi_schedule(&priv->napi); |
| 352 | } |
| 353 | } |
| 354 | |
| 355 | if (status & ERR_MASK) { |
| 356 | /* MSER/RXCR/RXFR/RXFL interrupt fires on corresponding |
| 357 | * 8-bit error counter overrun. |
| 358 | */ |
| 359 | |
| 360 | if (status & MSER_MASK) { |
| 361 | stats->rx_missed_errors += 0x100; |
| 362 | stats->rx_errors += 0x100; |
| 363 | } |
| 364 | |
| 365 | if (status & RXCR_MASK) { |
| 366 | stats->rx_crc_errors += 0x100; |
| 367 | stats->rx_errors += 0x100; |
| 368 | } |
| 369 | |
| 370 | if (status & RXFR_MASK) { |
| 371 | stats->rx_frame_errors += 0x100; |
| 372 | stats->rx_errors += 0x100; |
| 373 | } |
| 374 | |
| 375 | if (status & RXFL_MASK) { |
| 376 | stats->rx_over_errors += 0x100; |
| 377 | stats->rx_errors += 0x100; |
| 378 | } |
| 379 | } |
| 380 | |
| 381 | return IRQ_HANDLED; |
| 382 | } |
| 383 | |
Beniamino Galvani | 5a45e57 | 2014-05-11 18:11:48 +0200 | [diff] [blame] | 384 | #ifdef CONFIG_NET_POLL_CONTROLLER |
| 385 | static void arc_emac_poll_controller(struct net_device *dev) |
| 386 | { |
| 387 | disable_irq(dev->irq); |
| 388 | arc_emac_intr(dev->irq, dev); |
| 389 | enable_irq(dev->irq); |
| 390 | } |
| 391 | #endif |
| 392 | |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 393 | /** |
| 394 | * arc_emac_open - Open the network device. |
| 395 | * @ndev: Pointer to the network device. |
| 396 | * |
| 397 | * returns: 0, on success or non-zero error value on failure. |
| 398 | * |
| 399 | * This function sets the MAC address, requests and enables an IRQ |
| 400 | * for the EMAC device and starts the Tx queue. |
| 401 | * It also connects to the phy device. |
| 402 | */ |
| 403 | static int arc_emac_open(struct net_device *ndev) |
| 404 | { |
| 405 | struct arc_emac_priv *priv = netdev_priv(ndev); |
| 406 | struct phy_device *phy_dev = priv->phy_dev; |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 407 | int i; |
| 408 | |
| 409 | phy_dev->autoneg = AUTONEG_ENABLE; |
| 410 | phy_dev->speed = 0; |
| 411 | phy_dev->duplex = 0; |
Florian Fainelli | b0ac956 | 2013-12-05 14:52:15 -0800 | [diff] [blame] | 412 | phy_dev->advertising &= phy_dev->supported; |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 413 | |
Alexey Brodkin | a4a1139 | 2013-06-26 11:49:26 +0400 | [diff] [blame] | 414 | priv->last_rx_bd = 0; |
| 415 | |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 416 | /* Allocate and set buffers for Rx BD's */ |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 417 | for (i = 0; i < RX_BD_NUM; i++) { |
Alexey Brodkin | a4a1139 | 2013-06-26 11:49:26 +0400 | [diff] [blame] | 418 | dma_addr_t addr; |
| 419 | unsigned int *last_rx_bd = &priv->last_rx_bd; |
| 420 | struct arc_emac_bd *rxbd = &priv->rxbd[*last_rx_bd]; |
| 421 | struct buffer_state *rx_buff = &priv->rx_buff[*last_rx_bd]; |
| 422 | |
| 423 | rx_buff->skb = netdev_alloc_skb_ip_align(ndev, |
| 424 | EMAC_BUFFER_SIZE); |
| 425 | if (unlikely(!rx_buff->skb)) |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 426 | return -ENOMEM; |
| 427 | |
Alexey Brodkin | a4a1139 | 2013-06-26 11:49:26 +0400 | [diff] [blame] | 428 | addr = dma_map_single(&ndev->dev, (void *)rx_buff->skb->data, |
| 429 | EMAC_BUFFER_SIZE, DMA_FROM_DEVICE); |
| 430 | if (dma_mapping_error(&ndev->dev, addr)) { |
| 431 | netdev_err(ndev, "cannot dma map\n"); |
| 432 | dev_kfree_skb(rx_buff->skb); |
| 433 | return -ENOMEM; |
| 434 | } |
| 435 | dma_unmap_addr_set(rx_buff, addr, addr); |
| 436 | dma_unmap_len_set(rx_buff, len, EMAC_BUFFER_SIZE); |
| 437 | |
| 438 | rxbd->data = cpu_to_le32(addr); |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 439 | |
| 440 | /* Make sure pointer to data buffer is set */ |
| 441 | wmb(); |
| 442 | |
Alexey Brodkin | a4a1139 | 2013-06-26 11:49:26 +0400 | [diff] [blame] | 443 | /* Return ownership to EMAC */ |
| 444 | rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE); |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 445 | |
Alexey Brodkin | a4a1139 | 2013-06-26 11:49:26 +0400 | [diff] [blame] | 446 | *last_rx_bd = (*last_rx_bd + 1) % RX_BD_NUM; |
| 447 | } |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 448 | |
| 449 | /* Clean Tx BD's */ |
| 450 | memset(priv->txbd, 0, TX_RING_SZ); |
| 451 | |
| 452 | /* Initialize logical address filter */ |
| 453 | arc_reg_set(priv, R_LAFL, 0); |
| 454 | arc_reg_set(priv, R_LAFH, 0); |
| 455 | |
| 456 | /* Set BD ring pointers for device side */ |
| 457 | arc_reg_set(priv, R_RX_RING, (unsigned int)priv->rxbd_dma); |
| 458 | arc_reg_set(priv, R_TX_RING, (unsigned int)priv->txbd_dma); |
| 459 | |
| 460 | /* Enable interrupts */ |
Beniamino Galvani | 7ce7679 | 2014-09-10 22:50:02 +0200 | [diff] [blame] | 461 | arc_reg_set(priv, R_ENABLE, RXINT_MASK | TXINT_MASK | ERR_MASK); |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 462 | |
| 463 | /* Set CONTROL */ |
| 464 | arc_reg_set(priv, R_CTRL, |
| 465 | (RX_BD_NUM << 24) | /* RX BD table length */ |
| 466 | (TX_BD_NUM << 16) | /* TX BD table length */ |
| 467 | TXRN_MASK | RXRN_MASK); |
| 468 | |
| 469 | napi_enable(&priv->napi); |
| 470 | |
| 471 | /* Enable EMAC */ |
| 472 | arc_reg_or(priv, R_CTRL, EN_MASK); |
| 473 | |
| 474 | phy_start_aneg(priv->phy_dev); |
| 475 | |
| 476 | netif_start_queue(ndev); |
| 477 | |
| 478 | return 0; |
| 479 | } |
| 480 | |
| 481 | /** |
Beniamino Galvani | 775dd68 | 2014-05-11 18:11:47 +0200 | [diff] [blame] | 482 | * arc_emac_set_rx_mode - Change the receive filtering mode. |
| 483 | * @ndev: Pointer to the network device. |
| 484 | * |
| 485 | * This function enables/disables promiscuous or all-multicast mode |
| 486 | * and updates the multicast filtering list of the network device. |
| 487 | */ |
| 488 | static void arc_emac_set_rx_mode(struct net_device *ndev) |
| 489 | { |
| 490 | struct arc_emac_priv *priv = netdev_priv(ndev); |
| 491 | |
| 492 | if (ndev->flags & IFF_PROMISC) { |
| 493 | arc_reg_or(priv, R_CTRL, PROM_MASK); |
| 494 | } else { |
| 495 | arc_reg_clr(priv, R_CTRL, PROM_MASK); |
| 496 | |
| 497 | if (ndev->flags & IFF_ALLMULTI) { |
| 498 | arc_reg_set(priv, R_LAFL, ~0); |
| 499 | arc_reg_set(priv, R_LAFH, ~0); |
| 500 | } else { |
| 501 | struct netdev_hw_addr *ha; |
| 502 | unsigned int filter[2] = { 0, 0 }; |
| 503 | int bit; |
| 504 | |
| 505 | netdev_for_each_mc_addr(ha, ndev) { |
| 506 | bit = ether_crc_le(ETH_ALEN, ha->addr) >> 26; |
| 507 | filter[bit >> 5] |= 1 << (bit & 31); |
| 508 | } |
| 509 | |
| 510 | arc_reg_set(priv, R_LAFL, filter[0]); |
| 511 | arc_reg_set(priv, R_LAFH, filter[1]); |
| 512 | } |
| 513 | } |
| 514 | } |
| 515 | |
| 516 | /** |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 517 | * arc_emac_stop - Close the network device. |
| 518 | * @ndev: Pointer to the network device. |
| 519 | * |
| 520 | * This function stops the Tx queue, disables interrupts and frees the IRQ for |
| 521 | * the EMAC device. |
| 522 | * It also disconnects the PHY device associated with the EMAC device. |
| 523 | */ |
| 524 | static int arc_emac_stop(struct net_device *ndev) |
| 525 | { |
| 526 | struct arc_emac_priv *priv = netdev_priv(ndev); |
| 527 | |
| 528 | napi_disable(&priv->napi); |
| 529 | netif_stop_queue(ndev); |
| 530 | |
| 531 | /* Disable interrupts */ |
Beniamino Galvani | 7ce7679 | 2014-09-10 22:50:02 +0200 | [diff] [blame] | 532 | arc_reg_clr(priv, R_ENABLE, RXINT_MASK | TXINT_MASK | ERR_MASK); |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 533 | |
| 534 | /* Disable EMAC */ |
| 535 | arc_reg_clr(priv, R_CTRL, EN_MASK); |
| 536 | |
| 537 | return 0; |
| 538 | } |
| 539 | |
| 540 | /** |
| 541 | * arc_emac_stats - Get system network statistics. |
| 542 | * @ndev: Pointer to net_device structure. |
| 543 | * |
| 544 | * Returns the address of the device statistics structure. |
| 545 | * Statistics are updated in interrupt handler. |
| 546 | */ |
| 547 | static struct net_device_stats *arc_emac_stats(struct net_device *ndev) |
| 548 | { |
| 549 | struct arc_emac_priv *priv = netdev_priv(ndev); |
Tobias Klauser | ff458f6 | 2014-07-09 11:07:37 +0200 | [diff] [blame] | 550 | struct net_device_stats *stats = &ndev->stats; |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 551 | unsigned long miss, rxerr; |
| 552 | u8 rxcrc, rxfram, rxoflow; |
| 553 | |
| 554 | rxerr = arc_reg_get(priv, R_RXERR); |
| 555 | miss = arc_reg_get(priv, R_MISS); |
| 556 | |
| 557 | rxcrc = rxerr; |
| 558 | rxfram = rxerr >> 8; |
| 559 | rxoflow = rxerr >> 16; |
| 560 | |
| 561 | stats->rx_errors += miss; |
| 562 | stats->rx_errors += rxcrc + rxfram + rxoflow; |
| 563 | |
| 564 | stats->rx_over_errors += rxoflow; |
| 565 | stats->rx_frame_errors += rxfram; |
| 566 | stats->rx_crc_errors += rxcrc; |
| 567 | stats->rx_missed_errors += miss; |
| 568 | |
| 569 | return stats; |
| 570 | } |
| 571 | |
| 572 | /** |
| 573 | * arc_emac_tx - Starts the data transmission. |
| 574 | * @skb: sk_buff pointer that contains data to be Transmitted. |
| 575 | * @ndev: Pointer to net_device structure. |
| 576 | * |
| 577 | * returns: NETDEV_TX_OK, on success |
| 578 | * NETDEV_TX_BUSY, if any of the descriptors are not free. |
| 579 | * |
| 580 | * This function is invoked from upper layers to initiate transmission. |
| 581 | */ |
| 582 | static int arc_emac_tx(struct sk_buff *skb, struct net_device *ndev) |
| 583 | { |
| 584 | struct arc_emac_priv *priv = netdev_priv(ndev); |
| 585 | unsigned int len, *txbd_curr = &priv->txbd_curr; |
Tobias Klauser | ff458f6 | 2014-07-09 11:07:37 +0200 | [diff] [blame] | 586 | struct net_device_stats *stats = &ndev->stats; |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 587 | __le32 *info = &priv->txbd[*txbd_curr].info; |
| 588 | dma_addr_t addr; |
| 589 | |
| 590 | if (skb_padto(skb, ETH_ZLEN)) |
| 591 | return NETDEV_TX_OK; |
| 592 | |
| 593 | len = max_t(unsigned int, ETH_ZLEN, skb->len); |
| 594 | |
Beniamino Galvani | 74dd40b | 2014-09-10 22:50:03 +0200 | [diff] [blame] | 595 | if (unlikely(!arc_emac_tx_avail(priv))) { |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 596 | netif_stop_queue(ndev); |
Beniamino Galvani | 74dd40b | 2014-09-10 22:50:03 +0200 | [diff] [blame] | 597 | netdev_err(ndev, "BUG! Tx Ring full when queue awake!\n"); |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 598 | return NETDEV_TX_BUSY; |
| 599 | } |
| 600 | |
| 601 | addr = dma_map_single(&ndev->dev, (void *)skb->data, len, |
| 602 | DMA_TO_DEVICE); |
| 603 | |
| 604 | if (unlikely(dma_mapping_error(&ndev->dev, addr))) { |
| 605 | stats->tx_dropped++; |
| 606 | stats->tx_errors++; |
| 607 | dev_kfree_skb(skb); |
| 608 | return NETDEV_TX_OK; |
| 609 | } |
Alexey Brodkin | a4a1139 | 2013-06-26 11:49:26 +0400 | [diff] [blame] | 610 | dma_unmap_addr_set(&priv->tx_buff[*txbd_curr], addr, addr); |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 611 | dma_unmap_len_set(&priv->tx_buff[*txbd_curr], len, len); |
| 612 | |
| 613 | priv->tx_buff[*txbd_curr].skb = skb; |
Alexey Brodkin | a4a1139 | 2013-06-26 11:49:26 +0400 | [diff] [blame] | 614 | priv->txbd[*txbd_curr].data = cpu_to_le32(addr); |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 615 | |
| 616 | /* Make sure pointer to data buffer is set */ |
| 617 | wmb(); |
| 618 | |
Eric Dumazet | 37ec274 | 2013-12-19 18:10:40 -0800 | [diff] [blame] | 619 | skb_tx_timestamp(skb); |
| 620 | |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 621 | *info = cpu_to_le32(FOR_EMAC | FIRST_OR_LAST_MASK | len); |
| 622 | |
| 623 | /* Increment index to point to the next BD */ |
| 624 | *txbd_curr = (*txbd_curr + 1) % TX_BD_NUM; |
| 625 | |
Beniamino Galvani | 74dd40b | 2014-09-10 22:50:03 +0200 | [diff] [blame] | 626 | /* Ensure that tx_clean() sees the new txbd_curr before |
| 627 | * checking the queue status. This prevents an unneeded wake |
| 628 | * of the queue in tx_clean(). |
| 629 | */ |
| 630 | smp_mb(); |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 631 | |
Beniamino Galvani | 74dd40b | 2014-09-10 22:50:03 +0200 | [diff] [blame] | 632 | if (!arc_emac_tx_avail(priv)) { |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 633 | netif_stop_queue(ndev); |
Beniamino Galvani | 74dd40b | 2014-09-10 22:50:03 +0200 | [diff] [blame] | 634 | /* Refresh tx_dirty */ |
| 635 | smp_mb(); |
| 636 | if (arc_emac_tx_avail(priv)) |
| 637 | netif_start_queue(ndev); |
| 638 | } |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 639 | |
| 640 | arc_reg_set(priv, R_STATUS, TXPL_MASK); |
| 641 | |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 642 | return NETDEV_TX_OK; |
| 643 | } |
| 644 | |
Max Schwarz | 235a251 | 2014-04-18 02:17:32 +0200 | [diff] [blame] | 645 | static void arc_emac_set_address_internal(struct net_device *ndev) |
| 646 | { |
| 647 | struct arc_emac_priv *priv = netdev_priv(ndev); |
| 648 | unsigned int addr_low, addr_hi; |
| 649 | |
| 650 | addr_low = le32_to_cpu(*(__le32 *) &ndev->dev_addr[0]); |
| 651 | addr_hi = le16_to_cpu(*(__le16 *) &ndev->dev_addr[4]); |
| 652 | |
| 653 | arc_reg_set(priv, R_ADDRL, addr_low); |
| 654 | arc_reg_set(priv, R_ADDRH, addr_hi); |
| 655 | } |
| 656 | |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 657 | /** |
| 658 | * arc_emac_set_address - Set the MAC address for this device. |
| 659 | * @ndev: Pointer to net_device structure. |
| 660 | * @p: 6 byte Address to be written as MAC address. |
| 661 | * |
| 662 | * This function copies the HW address from the sockaddr structure to the |
| 663 | * net_device structure and updates the address in HW. |
| 664 | * |
| 665 | * returns: -EBUSY if the net device is busy or 0 if the address is set |
| 666 | * successfully. |
| 667 | */ |
| 668 | static int arc_emac_set_address(struct net_device *ndev, void *p) |
| 669 | { |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 670 | struct sockaddr *addr = p; |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 671 | |
| 672 | if (netif_running(ndev)) |
| 673 | return -EBUSY; |
| 674 | |
| 675 | if (!is_valid_ether_addr(addr->sa_data)) |
| 676 | return -EADDRNOTAVAIL; |
| 677 | |
| 678 | memcpy(ndev->dev_addr, addr->sa_data, ndev->addr_len); |
| 679 | |
Max Schwarz | 235a251 | 2014-04-18 02:17:32 +0200 | [diff] [blame] | 680 | arc_emac_set_address_internal(ndev); |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 681 | |
| 682 | return 0; |
| 683 | } |
| 684 | |
| 685 | static const struct net_device_ops arc_emac_netdev_ops = { |
| 686 | .ndo_open = arc_emac_open, |
| 687 | .ndo_stop = arc_emac_stop, |
| 688 | .ndo_start_xmit = arc_emac_tx, |
| 689 | .ndo_set_mac_address = arc_emac_set_address, |
| 690 | .ndo_get_stats = arc_emac_stats, |
Beniamino Galvani | 775dd68 | 2014-05-11 18:11:47 +0200 | [diff] [blame] | 691 | .ndo_set_rx_mode = arc_emac_set_rx_mode, |
Beniamino Galvani | 5a45e57 | 2014-05-11 18:11:48 +0200 | [diff] [blame] | 692 | #ifdef CONFIG_NET_POLL_CONTROLLER |
| 693 | .ndo_poll_controller = arc_emac_poll_controller, |
| 694 | #endif |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 695 | }; |
| 696 | |
Romain Perier | 23d2d9a | 2014-08-26 13:14:51 +0000 | [diff] [blame] | 697 | int arc_emac_probe(struct net_device *ndev, int interface) |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 698 | { |
Romain Perier | 23d2d9a | 2014-08-26 13:14:51 +0000 | [diff] [blame] | 699 | struct device *dev = ndev->dev.parent; |
Thierry Reding | f757849 | 2013-09-18 15:24:44 +0200 | [diff] [blame] | 700 | struct resource res_regs; |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 701 | struct device_node *phy_node; |
| 702 | struct arc_emac_priv *priv; |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 703 | const char *mac_addr; |
Thierry Reding | f757849 | 2013-09-18 15:24:44 +0200 | [diff] [blame] | 704 | unsigned int id, clock_frequency, irq; |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 705 | int err; |
| 706 | |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 707 | |
| 708 | /* Get PHY from device tree */ |
Romain Perier | f15f44e | 2014-08-26 13:14:49 +0000 | [diff] [blame] | 709 | phy_node = of_parse_phandle(dev->of_node, "phy", 0); |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 710 | if (!phy_node) { |
Romain Perier | f15f44e | 2014-08-26 13:14:49 +0000 | [diff] [blame] | 711 | dev_err(dev, "failed to retrieve phy description from device tree\n"); |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 712 | return -ENODEV; |
| 713 | } |
| 714 | |
| 715 | /* Get EMAC registers base address from device tree */ |
Romain Perier | f15f44e | 2014-08-26 13:14:49 +0000 | [diff] [blame] | 716 | err = of_address_to_resource(dev->of_node, 0, &res_regs); |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 717 | if (err) { |
Romain Perier | f15f44e | 2014-08-26 13:14:49 +0000 | [diff] [blame] | 718 | dev_err(dev, "failed to retrieve registers base from device tree\n"); |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 719 | return -ENODEV; |
| 720 | } |
| 721 | |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 722 | /* Get IRQ from device tree */ |
Romain Perier | f15f44e | 2014-08-26 13:14:49 +0000 | [diff] [blame] | 723 | irq = irq_of_parse_and_map(dev->of_node, 0); |
Thierry Reding | f757849 | 2013-09-18 15:24:44 +0200 | [diff] [blame] | 724 | if (!irq) { |
Romain Perier | f15f44e | 2014-08-26 13:14:49 +0000 | [diff] [blame] | 725 | dev_err(dev, "failed to retrieve <irq> value from device tree\n"); |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 726 | return -ENODEV; |
| 727 | } |
| 728 | |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 729 | |
| 730 | ndev->netdev_ops = &arc_emac_netdev_ops; |
| 731 | ndev->ethtool_ops = &arc_emac_ethtool_ops; |
| 732 | ndev->watchdog_timeo = TX_TIMEOUT; |
| 733 | /* FIXME :: no multicast support yet */ |
| 734 | ndev->flags &= ~IFF_MULTICAST; |
| 735 | |
| 736 | priv = netdev_priv(ndev); |
Romain Perier | f15f44e | 2014-08-26 13:14:49 +0000 | [diff] [blame] | 737 | priv->dev = dev; |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 738 | |
Romain Perier | f15f44e | 2014-08-26 13:14:49 +0000 | [diff] [blame] | 739 | priv->regs = devm_ioremap_resource(dev, &res_regs); |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 740 | if (IS_ERR(priv->regs)) { |
Romain Perier | 23d2d9a | 2014-08-26 13:14:51 +0000 | [diff] [blame] | 741 | return PTR_ERR(priv->regs); |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 742 | } |
Romain Perier | f15f44e | 2014-08-26 13:14:49 +0000 | [diff] [blame] | 743 | dev_dbg(dev, "Registers base address is 0x%p\n", priv->regs); |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 744 | |
Romain Perier | 23d2d9a | 2014-08-26 13:14:51 +0000 | [diff] [blame] | 745 | if (priv->clk) { |
Heiko Stübner | 88154c9 | 2014-04-25 10:06:13 +0200 | [diff] [blame] | 746 | err = clk_prepare_enable(priv->clk); |
| 747 | if (err) { |
Romain Perier | f15f44e | 2014-08-26 13:14:49 +0000 | [diff] [blame] | 748 | dev_err(dev, "failed to enable clock\n"); |
Romain Perier | 23d2d9a | 2014-08-26 13:14:51 +0000 | [diff] [blame] | 749 | return err; |
Heiko Stübner | 88154c9 | 2014-04-25 10:06:13 +0200 | [diff] [blame] | 750 | } |
| 751 | |
| 752 | clock_frequency = clk_get_rate(priv->clk); |
Romain Perier | 23d2d9a | 2014-08-26 13:14:51 +0000 | [diff] [blame] | 753 | } else { |
| 754 | /* Get CPU clock frequency from device tree */ |
| 755 | if (of_property_read_u32(dev->of_node, "clock-frequency", |
| 756 | &clock_frequency)) { |
| 757 | dev_err(dev, "failed to retrieve <clock-frequency> from device tree\n"); |
| 758 | return -EINVAL; |
| 759 | } |
Heiko Stübner | 88154c9 | 2014-04-25 10:06:13 +0200 | [diff] [blame] | 760 | } |
| 761 | |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 762 | id = arc_reg_get(priv, R_ID); |
| 763 | |
| 764 | /* Check for EMAC revision 5 or 7, magic number */ |
| 765 | if (!(id == 0x0005fd02 || id == 0x0007fd02)) { |
Romain Perier | f15f44e | 2014-08-26 13:14:49 +0000 | [diff] [blame] | 766 | dev_err(dev, "ARC EMAC not detected, id=0x%x\n", id); |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 767 | err = -ENODEV; |
Heiko Stübner | 88154c9 | 2014-04-25 10:06:13 +0200 | [diff] [blame] | 768 | goto out_clken; |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 769 | } |
Romain Perier | f15f44e | 2014-08-26 13:14:49 +0000 | [diff] [blame] | 770 | dev_info(dev, "ARC EMAC detected with id: 0x%x\n", id); |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 771 | |
| 772 | /* Set poll rate so that it polls every 1 ms */ |
| 773 | arc_reg_set(priv, R_POLLRATE, clock_frequency / 1000000); |
| 774 | |
Thierry Reding | f757849 | 2013-09-18 15:24:44 +0200 | [diff] [blame] | 775 | ndev->irq = irq; |
Romain Perier | f15f44e | 2014-08-26 13:14:49 +0000 | [diff] [blame] | 776 | dev_info(dev, "IRQ is %d\n", ndev->irq); |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 777 | |
| 778 | /* Register interrupt handler for device */ |
Romain Perier | f15f44e | 2014-08-26 13:14:49 +0000 | [diff] [blame] | 779 | err = devm_request_irq(dev, ndev->irq, arc_emac_intr, 0, |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 780 | ndev->name, ndev); |
| 781 | if (err) { |
Romain Perier | f15f44e | 2014-08-26 13:14:49 +0000 | [diff] [blame] | 782 | dev_err(dev, "could not allocate IRQ\n"); |
Heiko Stübner | 88154c9 | 2014-04-25 10:06:13 +0200 | [diff] [blame] | 783 | goto out_clken; |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 784 | } |
| 785 | |
| 786 | /* Get MAC address from device tree */ |
Romain Perier | f15f44e | 2014-08-26 13:14:49 +0000 | [diff] [blame] | 787 | mac_addr = of_get_mac_address(dev->of_node); |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 788 | |
Luka Perkov | 9947081 | 2013-10-30 00:11:00 +0100 | [diff] [blame] | 789 | if (mac_addr) |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 790 | memcpy(ndev->dev_addr, mac_addr, ETH_ALEN); |
Luka Perkov | 9947081 | 2013-10-30 00:11:00 +0100 | [diff] [blame] | 791 | else |
| 792 | eth_hw_addr_random(ndev); |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 793 | |
Max Schwarz | 235a251 | 2014-04-18 02:17:32 +0200 | [diff] [blame] | 794 | arc_emac_set_address_internal(ndev); |
Romain Perier | f15f44e | 2014-08-26 13:14:49 +0000 | [diff] [blame] | 795 | dev_info(dev, "MAC address is now %pM\n", ndev->dev_addr); |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 796 | |
| 797 | /* Do 1 allocation instead of 2 separate ones for Rx and Tx BD rings */ |
Romain Perier | f15f44e | 2014-08-26 13:14:49 +0000 | [diff] [blame] | 798 | priv->rxbd = dmam_alloc_coherent(dev, RX_RING_SZ + TX_RING_SZ, |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 799 | &priv->rxbd_dma, GFP_KERNEL); |
| 800 | |
| 801 | if (!priv->rxbd) { |
Romain Perier | f15f44e | 2014-08-26 13:14:49 +0000 | [diff] [blame] | 802 | dev_err(dev, "failed to allocate data buffers\n"); |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 803 | err = -ENOMEM; |
Heiko Stübner | 88154c9 | 2014-04-25 10:06:13 +0200 | [diff] [blame] | 804 | goto out_clken; |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 805 | } |
| 806 | |
| 807 | priv->txbd = priv->rxbd + RX_BD_NUM; |
| 808 | |
| 809 | priv->txbd_dma = priv->rxbd_dma + RX_RING_SZ; |
Romain Perier | f15f44e | 2014-08-26 13:14:49 +0000 | [diff] [blame] | 810 | dev_dbg(dev, "EMAC Device addr: Rx Ring [0x%x], Tx Ring[%x]\n", |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 811 | (unsigned int)priv->rxbd_dma, (unsigned int)priv->txbd_dma); |
| 812 | |
Romain Perier | 93e91b3 | 2014-08-26 13:14:50 +0000 | [diff] [blame] | 813 | err = arc_mdio_probe(priv); |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 814 | if (err) { |
Romain Perier | f15f44e | 2014-08-26 13:14:49 +0000 | [diff] [blame] | 815 | dev_err(dev, "failed to probe MII bus\n"); |
Heiko Stübner | 88154c9 | 2014-04-25 10:06:13 +0200 | [diff] [blame] | 816 | goto out_clken; |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 817 | } |
| 818 | |
| 819 | priv->phy_dev = of_phy_connect(ndev, phy_node, arc_emac_adjust_link, 0, |
Romain Perier | 23d2d9a | 2014-08-26 13:14:51 +0000 | [diff] [blame] | 820 | interface); |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 821 | if (!priv->phy_dev) { |
Romain Perier | f15f44e | 2014-08-26 13:14:49 +0000 | [diff] [blame] | 822 | dev_err(dev, "of_phy_connect() failed\n"); |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 823 | err = -ENODEV; |
Heiko Stübner | 796bec1 | 2014-04-25 10:03:29 +0200 | [diff] [blame] | 824 | goto out_mdio; |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 825 | } |
| 826 | |
Romain Perier | f15f44e | 2014-08-26 13:14:49 +0000 | [diff] [blame] | 827 | dev_info(dev, "connected to %s phy with id 0x%x\n", |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 828 | priv->phy_dev->drv->name, priv->phy_dev->phy_id); |
| 829 | |
| 830 | netif_napi_add(ndev, &priv->napi, arc_emac_poll, ARC_EMAC_NAPI_WEIGHT); |
| 831 | |
| 832 | err = register_netdev(ndev); |
| 833 | if (err) { |
Romain Perier | f15f44e | 2014-08-26 13:14:49 +0000 | [diff] [blame] | 834 | dev_err(dev, "failed to register network device\n"); |
Heiko Stübner | 796bec1 | 2014-04-25 10:03:29 +0200 | [diff] [blame] | 835 | goto out_netif_api; |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 836 | } |
| 837 | |
| 838 | return 0; |
| 839 | |
Heiko Stübner | 796bec1 | 2014-04-25 10:03:29 +0200 | [diff] [blame] | 840 | out_netif_api: |
| 841 | netif_napi_del(&priv->napi); |
| 842 | phy_disconnect(priv->phy_dev); |
| 843 | priv->phy_dev = NULL; |
| 844 | out_mdio: |
| 845 | arc_mdio_remove(priv); |
Heiko Stübner | 88154c9 | 2014-04-25 10:06:13 +0200 | [diff] [blame] | 846 | out_clken: |
Romain Perier | 23d2d9a | 2014-08-26 13:14:51 +0000 | [diff] [blame] | 847 | if (priv->clk) |
Heiko Stübner | 88154c9 | 2014-04-25 10:06:13 +0200 | [diff] [blame] | 848 | clk_disable_unprepare(priv->clk); |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 849 | return err; |
| 850 | } |
Romain Perier | 23d2d9a | 2014-08-26 13:14:51 +0000 | [diff] [blame] | 851 | EXPORT_SYMBOL_GPL(arc_emac_probe); |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 852 | |
Romain Perier | 23d2d9a | 2014-08-26 13:14:51 +0000 | [diff] [blame] | 853 | int arc_emac_remove(struct net_device *ndev) |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 854 | { |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 855 | struct arc_emac_priv *priv = netdev_priv(ndev); |
| 856 | |
| 857 | phy_disconnect(priv->phy_dev); |
| 858 | priv->phy_dev = NULL; |
| 859 | arc_mdio_remove(priv); |
| 860 | unregister_netdev(ndev); |
| 861 | netif_napi_del(&priv->napi); |
Heiko Stübner | 88154c9 | 2014-04-25 10:06:13 +0200 | [diff] [blame] | 862 | |
| 863 | if (!IS_ERR(priv->clk)) { |
| 864 | clk_disable_unprepare(priv->clk); |
Heiko Stübner | 88154c9 | 2014-04-25 10:06:13 +0200 | [diff] [blame] | 865 | } |
| 866 | |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 867 | |
| 868 | return 0; |
| 869 | } |
Romain Perier | 23d2d9a | 2014-08-26 13:14:51 +0000 | [diff] [blame] | 870 | EXPORT_SYMBOL_GPL(arc_emac_remove); |
Alexey Brodkin | e4f2379 | 2013-06-24 09:54:27 +0400 | [diff] [blame] | 871 | |
| 872 | MODULE_AUTHOR("Alexey Brodkin <abrodkin@synopsys.com>"); |
| 873 | MODULE_DESCRIPTION("ARC EMAC driver"); |
| 874 | MODULE_LICENSE("GPL"); |