target/linux/ramips/files/drivers/net/ramips.c

   1 /*
   2  *   This program is free software; you can redistribute it and/or modify
   3  *   it under the terms of the GNU General Public License as published by
   4  *   the Free Software Foundation; version 2 of the License
   5  *
   6  *   This program is distributed in the hope that it will be useful,
   7  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
   8  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   9  *   GNU General Public License for more details.
  10  *
  11  *   You should have received a copy of the GNU General Public License
  12  *   along with this program; if not, write to the Free Software
  13  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
  14  *
  15  *   Copyright (C) 2009 John Crispin <blogic@openwrt.org>
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/kernel.h>
  20 #include <linux/types.h>
  21 #include <linux/dma-mapping.h>
  22 #include <linux/init.h>
  23 #include <linux/skbuff.h>
  24 #include <linux/etherdevice.h>
  25 #include <linux/ethtool.h>
  26 #include <linux/platform_device.h>
  27
  28 #include <ramips_eth_platform.h>
  29 #include "ramips_eth.h"
  30
  31 #define TX_TIMEOUT (20 * HZ / 100)
  32 #define MAX_RX_LENGTH   1600
  33
  34 #ifdef CONFIG_RALINK_RT305X
  35 #include "ramips_esw.c"
  36 #endif
  37
  38 #define phys_to_bus(a)  (a & 0x1FFFFFFF)
  39
  40 static struct net_device * ramips_dev;
  41 static void __iomem *ramips_fe_base = 0;
  42
  43 static inline void
  44 ramips_fe_wr(u32 val, unsigned reg)
  45 {
  46         __raw_writel(val, ramips_fe_base + reg);
  47 }
  48
  49 static inline u32
  50 ramips_fe_rr(unsigned reg)
  51 {
  52         return __raw_readl(ramips_fe_base + reg);
  53 }
  54
  55 static inline void
  56 ramips_fe_int_disable(u32 mask)
  57 {
  58         ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) & ~mask,
  59                      RAMIPS_FE_INT_ENABLE);
  60         /* flush write */
  61         ramips_fe_rr(RAMIPS_FE_INT_ENABLE);
  62 }
  63
  64 static inline void
  65 ramips_fe_int_enable(u32 mask)
  66 {
  67         ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) | mask,
  68                      RAMIPS_FE_INT_ENABLE);
  69         /* flush write */
  70         ramips_fe_rr(RAMIPS_FE_INT_ENABLE);
  71 }
  72
  73 static inline void
  74 ramips_hw_set_macaddr(unsigned char *mac)
  75 {
  76         ramips_fe_wr((mac[0] << 8) | mac[1], RAMIPS_GDMA1_MAC_ADRH);
  77         ramips_fe_wr((mac[2] << 24) | (mac[3] << 16) | (mac[4] << 8) | mac[5],
  78                      RAMIPS_GDMA1_MAC_ADRL);
  79 }
  80
  81 #ifdef CONFIG_RALINK_RT288X
  82 static void
  83 ramips_setup_mdio_cfg(struct raeth_priv *re)
  84 {
  85         unsigned int mdio_cfg;
  86
  87         mdio_cfg = RAMIPS_MDIO_CFG_TX_CLK_SKEW_200 |
  88                    RAMIPS_MDIO_CFG_TX_CLK_SKEW_200 |
  89                    RAMIPS_MDIO_CFG_GP1_FRC_EN;
  90
  91         if (re->duplex == DUPLEX_FULL)
  92                 mdio_cfg |= RAMIPS_MDIO_CFG_GP1_DUPLEX;
  93
  94         if (re->tx_fc)
  95                 mdio_cfg |= RAMIPS_MDIO_CFG_GP1_FC_TX;
  96
  97         if (re->rx_fc)
  98                 mdio_cfg |= RAMIPS_MDIO_CFG_GP1_FC_RX;
  99
 100         switch (re->speed) {
 101         case SPEED_10:
 102                 mdio_cfg |= RAMIPS_MDIO_CFG_GP1_SPEED_10;
 103                 break;
 104         case SPEED_100:
 105                 mdio_cfg |= RAMIPS_MDIO_CFG_GP1_SPEED_100;
 106                 break;
 107         case SPEED_1000:
 108                 mdio_cfg |= RAMIPS_MDIO_CFG_GP1_SPEED_1000;
 109                 break;
 110         default:
 111                 BUG();
 112         }
 113
 114         ramips_fe_wr(mdio_cfg, RAMIPS_MDIO_CFG);
 115 }
 116 #else
 117 static inline void ramips_setup_mdio_cfg(struct raeth_priv *re)
 118 {
 119 }
 120 #endif /* CONFIG_RALINK_RT288X */
 121
 122 static void
 123 ramips_cleanup_dma(struct raeth_priv *re)
 124 {
 125         int i;
 126
 127         for (i = 0; i < NUM_RX_DESC; i++)
 128                 if (re->rx_skb[i])
 129                         dev_kfree_skb_any(re->rx_skb[i]);
 130
 131         if (re->rx)
 132                 dma_free_coherent(NULL,
 133                                   NUM_RX_DESC * sizeof(struct ramips_rx_dma),
 134                                   re->rx, re->phy_rx);
 135
 136         if (re->tx)
 137                 dma_free_coherent(NULL,
 138                                   NUM_TX_DESC * sizeof(struct ramips_tx_dma),
 139                                   re->tx, re->phy_tx);
 140 }
 141
 142 static int
 143 ramips_alloc_dma(struct raeth_priv *re)
 144 {
 145         int err = -ENOMEM;
 146         int i;
 147
 148         re->skb_free_idx = 0;
 149
 150         /* setup tx ring */
 151         re->tx = dma_alloc_coherent(NULL,
 152                                     NUM_TX_DESC * sizeof(struct ramips_tx_dma),
 153                                     &re->phy_tx, GFP_ATOMIC);
 154         if (!re->tx)
 155                 goto err_cleanup;
 156
 157         memset(re->tx, 0, NUM_TX_DESC * sizeof(struct ramips_tx_dma));
 158         for (i = 0; i < NUM_TX_DESC; i++) {
 159                 re->tx[i].txd2 = TX_DMA_LSO | TX_DMA_DONE;
 160                 re->tx[i].txd4 = TX_DMA_QN(3) | TX_DMA_PN(1);
 161         }
 162
 163         /* setup rx ring */
 164         re->rx = dma_alloc_coherent(NULL,
 165                                     NUM_RX_DESC * sizeof(struct ramips_rx_dma),
 166                                     &re->phy_rx, GFP_ATOMIC);
 167         if (!re->rx)
 168                 goto err_cleanup;
 169
 170         memset(re->rx, 0, sizeof(struct ramips_rx_dma) * NUM_RX_DESC);
 171         for (i = 0; i < NUM_RX_DESC; i++) {
 172                 struct sk_buff *new_skb = dev_alloc_skb(MAX_RX_LENGTH + 2);
 173
 174                 if (!new_skb)
 175                         goto err_cleanup;
 176
 177                 skb_reserve(new_skb, 2);
 178                 re->rx[i].rxd1 = dma_map_single(NULL,
 179                                                 new_skb->data,
 180                                                 MAX_RX_LENGTH,
 181                                                 DMA_FROM_DEVICE);
 182                 re->rx[i].rxd2 |= RX_DMA_LSO;
 183                 re->rx_skb[i] = new_skb;
 184         }
 185
 186         return 0;
 187
 188  err_cleanup:
 189         ramips_cleanup_dma(re);
 190         return err;
 191 }
 192
 193 static void
 194 ramips_setup_dma(struct raeth_priv *re)
 195 {
 196         ramips_fe_wr(phys_to_bus(re->phy_tx), RAMIPS_TX_BASE_PTR0);
 197         ramips_fe_wr(NUM_TX_DESC, RAMIPS_TX_MAX_CNT0);
 198         ramips_fe_wr(0, RAMIPS_TX_CTX_IDX0);
 199         ramips_fe_wr(RAMIPS_PST_DTX_IDX0, RAMIPS_PDMA_RST_CFG);
 200
 201         ramips_fe_wr(phys_to_bus(re->phy_rx), RAMIPS_RX_BASE_PTR0);
 202         ramips_fe_wr(NUM_RX_DESC, RAMIPS_RX_MAX_CNT0);
 203         ramips_fe_wr((NUM_RX_DESC - 1), RAMIPS_RX_CALC_IDX0);
 204         ramips_fe_wr(RAMIPS_PST_DRX_IDX0, RAMIPS_PDMA_RST_CFG);
 205 }
 206
 207 static int
 208 ramips_eth_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
 209 {
 210         struct raeth_priv *priv = netdev_priv(dev);
 211         unsigned long tx;
 212         unsigned int tx_next;
 213         unsigned int mapped_addr;
 214         unsigned long flags;
 215
 216         if (priv->plat->min_pkt_len) {
 217                 if (skb->len < priv->plat->min_pkt_len) {
 218                         if (skb_padto(skb, priv->plat->min_pkt_len)) {
 219                                 printk(KERN_ERR
 220                                        "ramips_eth: skb_padto failed\n");
 221                                 kfree_skb(skb);
 222                                 return 0;
 223                         }
 224                         skb_put(skb, priv->plat->min_pkt_len - skb->len);
 225                 }
 226         }
 227
 228         dev->trans_start = jiffies;
 229         mapped_addr = (unsigned int) dma_map_single(NULL, skb->data, skb->len,
 230                                                     DMA_TO_DEVICE);
 231         dma_sync_single_for_device(NULL, mapped_addr, skb->len, DMA_TO_DEVICE);
 232         spin_lock_irqsave(&priv->page_lock, flags);
 233         tx = ramips_fe_rr(RAMIPS_TX_CTX_IDX0);
 234         tx_next = (tx + 1) % NUM_TX_DESC;
 235
 236         if ((priv->tx_skb[tx]) || (priv->tx_skb[tx_next]) ||
 237             !(priv->tx[tx].txd2 & TX_DMA_DONE) ||
 238             !(priv->tx[tx_next].txd2 & TX_DMA_DONE))
 239                 goto out;
 240
 241         priv->tx[tx].txd1 = mapped_addr;
 242         priv->tx[tx].txd2 &= ~(TX_DMA_PLEN0_MASK | TX_DMA_DONE);
 243         priv->tx[tx].txd2 |= TX_DMA_PLEN0(skb->len);
 244         dev->stats.tx_packets++;
 245         dev->stats.tx_bytes += skb->len;
 246         priv->tx_skb[tx] = skb;
 247         wmb();
 248         ramips_fe_wr(tx_next, RAMIPS_TX_CTX_IDX0);
 249         spin_unlock_irqrestore(&priv->page_lock, flags);
 250         return NETDEV_TX_OK;
 251
 252  out:
 253         spin_unlock_irqrestore(&priv->page_lock, flags);
 254         dev->stats.tx_dropped++;
 255         kfree_skb(skb);
 256         return NETDEV_TX_OK;
 257 }
 258
 259 static void
 260 ramips_eth_rx_hw(unsigned long ptr)
 261 {
 262         struct net_device *dev = (struct net_device *) ptr;
 263         struct raeth_priv *priv = netdev_priv(dev);
 264         int rx;
 265         int max_rx = 16;
 266
 267         while (max_rx) {
 268                 struct sk_buff *rx_skb, *new_skb;
 269
 270                 rx = (ramips_fe_rr(RAMIPS_RX_CALC_IDX0) + 1) % NUM_RX_DESC;
 271                 if (!(priv->rx[rx].rxd2 & RX_DMA_DONE))
 272                         break;
 273                 max_rx--;
 274
 275                 new_skb = netdev_alloc_skb(dev, MAX_RX_LENGTH + 2);
 276                 /* Reuse the buffer on allocation failures */
 277                 if (new_skb) {
 278                         rx_skb = priv->rx_skb[rx];
 279                         skb_put(rx_skb, RX_DMA_PLEN0(priv->rx[rx].rxd2));
 280                         rx_skb->dev = dev;
 281                         rx_skb->protocol = eth_type_trans(rx_skb, dev);
 282                         rx_skb->ip_summed = CHECKSUM_NONE;
 283                         dev->stats.rx_packets++;
 284                         dev->stats.rx_bytes += rx_skb->len;
 285                         netif_rx(rx_skb);
 286
 287                         priv->rx_skb[rx] = new_skb;
 288                         skb_reserve(new_skb, 2);
 289                         priv->rx[rx].rxd1 = dma_map_single(NULL,
 290                                                            new_skb->data,
 291                                                            MAX_RX_LENGTH,
 292                                                            DMA_FROM_DEVICE);
 293                 }
 294
 295                 priv->rx[rx].rxd2 &= ~RX_DMA_DONE;
 296                 wmb();
 297                 ramips_fe_wr(rx, RAMIPS_RX_CALC_IDX0);
 298         }
 299
 300         if (max_rx == 0)
 301                 tasklet_schedule(&priv->rx_tasklet);
 302         else
 303                 ramips_fe_int_enable(RAMIPS_RX_DLY_INT);
 304 }
 305
 306 static void
 307 ramips_eth_tx_housekeeping(unsigned long ptr)
 308 {
 309         struct net_device *dev = (struct net_device*)ptr;
 310         struct raeth_priv *priv = netdev_priv(dev);
 311
 312         while ((priv->tx[priv->skb_free_idx].txd2 & TX_DMA_DONE) &&
 313                (priv->tx_skb[priv->skb_free_idx])) {
 314                 dev_kfree_skb_irq(priv->tx_skb[priv->skb_free_idx]);
 315                 priv->tx_skb[priv->skb_free_idx] = 0;
 316                 priv->skb_free_idx++;
 317                 if (priv->skb_free_idx >= NUM_TX_DESC)
 318                         priv->skb_free_idx = 0;
 319         }
 320
 321         ramips_fe_int_enable(RAMIPS_TX_DLY_INT);
 322 }
 323
 324 static void
 325 ramips_eth_timeout(struct net_device *dev)
 326 {
 327         struct raeth_priv *priv = netdev_priv(dev);
 328
 329         tasklet_schedule(&priv->tx_housekeeping_tasklet);
 330 }
 331
 332 static irqreturn_t
 333 ramips_eth_irq(int irq, void *dev)
 334 {
 335         struct raeth_priv *priv = netdev_priv(dev);
 336         unsigned long fe_int = ramips_fe_rr(RAMIPS_FE_INT_STATUS);
 337
 338         ramips_fe_wr(0xFFFFFFFF, RAMIPS_FE_INT_STATUS);
 339
 340         if (fe_int & RAMIPS_RX_DLY_INT) {
 341                 ramips_fe_int_disable(RAMIPS_RX_DLY_INT);
 342                 tasklet_schedule(&priv->rx_tasklet);
 343         }
 344
 345         if (fe_int & RAMIPS_TX_DLY_INT)
 346                 ramips_eth_tx_housekeeping((unsigned long)dev);
 347
 348         return IRQ_HANDLED;
 349 }
 350
 351 static int
 352 ramips_eth_open(struct net_device *dev)
 353 {
 354         struct raeth_priv *priv = netdev_priv(dev);
 355         int err;
 356
 357         err = request_irq(dev->irq, ramips_eth_irq, IRQF_DISABLED,
 358                           dev->name, dev);
 359         if (err)
 360                 return err;
 361
 362         err = ramips_alloc_dma(priv);
 363         if (err)
 364                 goto err_free_irq;
 365
 366         ramips_hw_set_macaddr(dev->dev_addr);
 367
 368         ramips_setup_dma(priv);
 369         ramips_fe_wr((ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) & 0xff) |
 370                 (RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN |
 371                 RAMIPS_TX_DMA_EN | RAMIPS_PDMA_SIZE_4DWORDS),
 372                 RAMIPS_PDMA_GLO_CFG);
 373         ramips_fe_wr((ramips_fe_rr(RAMIPS_FE_GLO_CFG) &
 374                 ~(RAMIPS_US_CYC_CNT_MASK << RAMIPS_US_CYC_CNT_SHIFT)) |
 375                 ((priv->plat->sys_freq / RAMIPS_US_CYC_CNT_DIVISOR) << RAMIPS_US_CYC_CNT_SHIFT),
 376                 RAMIPS_FE_GLO_CFG);
 377
 378         tasklet_init(&priv->tx_housekeeping_tasklet, ramips_eth_tx_housekeeping,
 379                      (unsigned long)dev);
 380         tasklet_init(&priv->rx_tasklet, ramips_eth_rx_hw, (unsigned long)dev);
 381
 382         ramips_setup_mdio_cfg(priv);
 383
 384         ramips_fe_wr(RAMIPS_DELAY_INIT, RAMIPS_DLY_INT_CFG);
 385         ramips_fe_wr(RAMIPS_TX_DLY_INT | RAMIPS_RX_DLY_INT, RAMIPS_FE_INT_ENABLE);
 386         ramips_fe_wr(ramips_fe_rr(RAMIPS_GDMA1_FWD_CFG) &
 387                 ~(RAMIPS_GDM1_ICS_EN | RAMIPS_GDM1_TCS_EN | RAMIPS_GDM1_UCS_EN | 0xffff),
 388                 RAMIPS_GDMA1_FWD_CFG);
 389         ramips_fe_wr(ramips_fe_rr(RAMIPS_CDMA_CSG_CFG) &
 390                 ~(RAMIPS_ICS_GEN_EN | RAMIPS_TCS_GEN_EN | RAMIPS_UCS_GEN_EN),
 391                 RAMIPS_CDMA_CSG_CFG);
 392         ramips_fe_wr(RAMIPS_PSE_FQFC_CFG_INIT, RAMIPS_PSE_FQ_CFG);
 393         ramips_fe_wr(1, RAMIPS_FE_RST_GL);
 394         ramips_fe_wr(0, RAMIPS_FE_RST_GL);
 395
 396         netif_start_queue(dev);
 397         return 0;
 398
 399  err_free_irq:
 400         free_irq(dev->irq, dev);
 401         return err;
 402 }
 403
 404 static int
 405 ramips_eth_stop(struct net_device *dev)
 406 {
 407         struct raeth_priv *priv = netdev_priv(dev);
 408
 409         ramips_fe_wr(ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) &
 410                      ~(RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN | RAMIPS_TX_DMA_EN),
 411                      RAMIPS_PDMA_GLO_CFG);
 412
 413         /* disable all interrupts in the hw */
 414         ramips_fe_wr(0, RAMIPS_FE_INT_ENABLE);
 415
 416         free_irq(dev->irq, dev);
 417         netif_stop_queue(dev);
 418         tasklet_kill(&priv->tx_housekeeping_tasklet);
 419         tasklet_kill(&priv->rx_tasklet);
 420         ramips_cleanup_dma(priv);
 421         printk(KERN_DEBUG "ramips_eth: stopped\n");
 422         return 0;
 423 }
 424
 425 static int __init
 426 ramips_eth_probe(struct net_device *dev)
 427 {
 428         struct raeth_priv *priv = netdev_priv(dev);
 429
 430         BUG_ON(!priv->plat->reset_fe);
 431         priv->plat->reset_fe();
 432         net_srandom(jiffies);
 433         memcpy(dev->dev_addr, priv->plat->mac, ETH_ALEN);
 434
 435         ether_setup(dev);
 436         dev->mtu = 1500;
 437         dev->watchdog_timeo = TX_TIMEOUT;
 438         spin_lock_init(&priv->page_lock);
 439
 440         return 0;
 441 }
 442
 443 static const struct net_device_ops ramips_eth_netdev_ops = {
 444         .ndo_init               = ramips_eth_probe,
 445         .ndo_open               = ramips_eth_open,
 446         .ndo_stop               = ramips_eth_stop,
 447         .ndo_start_xmit         = ramips_eth_hard_start_xmit,
 448         .ndo_tx_timeout         = ramips_eth_timeout,
 449         .ndo_change_mtu         = eth_change_mtu,
 450         .ndo_set_mac_address    = eth_mac_addr,
 451         .ndo_validate_addr      = eth_validate_addr,
 452 };
 453
 454 static int
 455 ramips_eth_plat_probe(struct platform_device *plat)
 456 {
 457         struct raeth_priv *priv;
 458         struct ramips_eth_platform_data *data = plat->dev.platform_data;
 459         struct resource *res;
 460         int err;
 461
 462         if (!data) {
 463                 dev_err(&plat->dev, "no platform data specified\n");
 464                 return -EINVAL;
 465         }
 466
 467         res = platform_get_resource(plat, IORESOURCE_MEM, 0);
 468         if (!res) {
 469                 dev_err(&plat->dev, "no memory resource found\n");
 470                 return -ENXIO;
 471         }
 472
 473         ramips_fe_base = ioremap_nocache(res->start, res->end - res->start + 1);
 474         if (!ramips_fe_base)
 475                 return -ENOMEM;
 476
 477         ramips_dev = alloc_etherdev(sizeof(struct raeth_priv));
 478         if (!ramips_dev) {
 479                 dev_err(&plat->dev, "alloc_etherdev failed\n");
 480                 err = -ENOMEM;
 481                 goto err_unmap;
 482         }
 483
 484         strcpy(ramips_dev->name, "eth%d");
 485         ramips_dev->irq = platform_get_irq(plat, 0);
 486         if (ramips_dev->irq < 0) {
 487                 dev_err(&plat->dev, "no IRQ resource found\n");
 488                 err = -ENXIO;
 489                 goto err_free_dev;
 490         }
 491         ramips_dev->addr_len = ETH_ALEN;
 492         ramips_dev->base_addr = (unsigned long)ramips_fe_base;
 493         ramips_dev->netdev_ops = &ramips_eth_netdev_ops;
 494
 495         priv = netdev_priv(ramips_dev);
 496
 497         priv->speed = data->speed;
 498         priv->duplex = data->duplex;
 499         priv->rx_fc = data->rx_fc;
 500         priv->tx_fc = data->tx_fc;
 501         priv->plat = data;
 502
 503         err = register_netdev(ramips_dev);
 504         if (err) {
 505                 dev_err(&plat->dev, "error bringing up device\n");
 506                 goto err_free_dev;
 507         }
 508
 509 #ifdef CONFIG_RALINK_RT305X
 510         rt305x_esw_init();
 511 #endif
 512         printk(KERN_DEBUG "ramips_eth: loaded\n");
 513         return 0;
 514
 515  err_free_dev:
 516         kfree(ramips_dev);
 517  err_unmap:
 518         iounmap(ramips_fe_base);
 519         return err;
 520 }
 521
 522 static int
 523 ramips_eth_plat_remove(struct platform_device *plat)
 524 {
 525         unregister_netdev(ramips_dev);
 526         free_netdev(ramips_dev);
 527         printk(KERN_DEBUG "ramips_eth: unloaded\n");
 528         return 0;
 529 }
 530
 531 static struct platform_driver ramips_eth_driver = {
 532         .probe = ramips_eth_plat_probe,
 533         .remove = ramips_eth_plat_remove,
 534         .driver = {
 535                 .name = "ramips_eth",
 536                 .owner = THIS_MODULE,
 537         },
 538 };
 539
 540 static int __init
 541 ramips_eth_init(void)
 542 {
 543         int ret = platform_driver_register(&ramips_eth_driver);
 544         if (ret)
 545                 printk(KERN_ERR
 546                        "ramips_eth: Error registering platfom driver!\n");
 547         return ret;
 548 }
 549
 550 static void __exit
 551 ramips_eth_cleanup(void)
 552 {
 553         platform_driver_unregister(&ramips_eth_driver);
 554 }
 555
 556 module_init(ramips_eth_init);
 557 module_exit(ramips_eth_cleanup);
 558
 559 MODULE_LICENSE("GPL");
 560 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
 561 MODULE_DESCRIPTION("ethernet driver for ramips boards");