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/platform_device.h>
  26
  27 #include <ramips_eth_platform.h>
  28 #include "ramips_eth.h"
  29
  30 #define TX_TIMEOUT (20 * HZ / 100)
  31 #define MAX_RX_LENGTH   1600
  32
  33 #ifdef CONFIG_RALINK_RT305X
  34 #include "ramips_esw.c"
  35 #endif
  36
  37 #define phys_to_bus(a)  (a & 0x1FFFFFFF)
  38
  39 static struct net_device * ramips_dev;
  40 static void __iomem *ramips_fe_base = 0;
  41
  42 static inline void
  43 ramips_fe_wr(u32 val, unsigned reg)
  44 {
  45         __raw_writel(val, ramips_fe_base + reg);
  46 }
  47
  48 static inline u32
  49 ramips_fe_rr(unsigned reg)
  50 {
  51         return __raw_readl(ramips_fe_base + reg);
  52 }
  53
  54 static void
  55 ramips_cleanup_dma(struct net_device *dev)
  56 {
  57         struct raeth_priv *priv = netdev_priv(dev);
  58         int i;
  59
  60         for (i = 0; i < NUM_RX_DESC; i++)
  61                 if (priv->rx_skb[i])
  62                         dev_kfree_skb_any(priv->rx_skb[i]);
  63
  64         if (priv->rx)
  65                 dma_free_coherent(NULL,
  66                                   NUM_RX_DESC * sizeof(struct ramips_rx_dma),
  67                                   priv->rx, priv->phy_rx);
  68
  69         if (priv->tx)
  70                 dma_free_coherent(NULL,
  71                                   NUM_TX_DESC * sizeof(struct ramips_tx_dma),
  72                                   priv->tx, priv->phy_tx);
  73 }
  74
  75 static int
  76 ramips_alloc_dma(struct net_device *dev)
  77 {
  78         struct raeth_priv *priv = netdev_priv(dev);
  79         int err = -ENOMEM;
  80         int i;
  81
  82         priv->skb_free_idx = 0;
  83
  84         /* setup tx ring */
  85         priv->tx = dma_alloc_coherent(NULL,
  86                                       NUM_TX_DESC * sizeof(struct ramips_tx_dma),
  87                                       &priv->phy_tx, GFP_ATOMIC);
  88         if (!priv->tx)
  89                 goto err_cleanup;
  90
  91         memset(priv->tx, 0, NUM_TX_DESC * sizeof(struct ramips_tx_dma));
  92         for (i = 0; i < NUM_TX_DESC; i++) {
  93                 priv->tx[i].txd2 |= TX_DMA_LSO | TX_DMA_DONE;
  94                 priv->tx[i].txd4 &= (TX_DMA_QN_MASK | TX_DMA_PN_MASK);
  95                 priv->tx[i].txd4 |= TX_DMA_QN(3) | TX_DMA_PN(1);
  96         }
  97
  98         /* setup rx ring */
  99         priv->rx = dma_alloc_coherent(NULL,
 100                                       NUM_RX_DESC * sizeof(struct ramips_rx_dma),
 101                                       &priv->phy_rx, GFP_ATOMIC);
 102         if (!priv->rx)
 103                 goto err_cleanup;
 104
 105         memset(priv->rx, 0, sizeof(struct ramips_rx_dma) * NUM_RX_DESC);
 106         for (i = 0; i < NUM_RX_DESC; i++) {
 107                 struct sk_buff *new_skb = dev_alloc_skb(MAX_RX_LENGTH + 2);
 108
 109                 if (!new_skb)
 110                         goto err_cleanup;
 111
 112                 skb_reserve(new_skb, 2);
 113                 priv->rx[i].rxd1 = dma_map_single(NULL,
 114                                                   skb_put(new_skb, 2),
 115                                                   MAX_RX_LENGTH + 2,
 116                                                   DMA_FROM_DEVICE);
 117                 priv->rx[i].rxd2 |= RX_DMA_LSO;
 118                 priv->rx_skb[i] = new_skb;
 119         }
 120
 121         return 0;
 122
 123  err_cleanup:
 124         ramips_cleanup_dma(dev);
 125         return err;
 126 }
 127
 128 static void
 129 ramips_setup_dma(struct net_device *dev)
 130 {
 131         struct raeth_priv *priv = netdev_priv(dev);
 132
 133         ramips_fe_wr(phys_to_bus(priv->phy_tx), RAMIPS_TX_BASE_PTR0);
 134         ramips_fe_wr(NUM_TX_DESC, RAMIPS_TX_MAX_CNT0);
 135         ramips_fe_wr(0, RAMIPS_TX_CTX_IDX0);
 136         ramips_fe_wr(RAMIPS_PST_DTX_IDX0, RAMIPS_PDMA_RST_CFG);
 137
 138         ramips_fe_wr(phys_to_bus(priv->phy_rx), RAMIPS_RX_BASE_PTR0);
 139         ramips_fe_wr(NUM_RX_DESC, RAMIPS_RX_MAX_CNT0);
 140         ramips_fe_wr((NUM_RX_DESC - 1), RAMIPS_RX_CALC_IDX0);
 141         ramips_fe_wr(RAMIPS_PST_DRX_IDX0, RAMIPS_PDMA_RST_CFG);
 142 }
 143
 144 static int
 145 ramips_eth_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
 146 {
 147         struct raeth_priv *priv = netdev_priv(dev);
 148         unsigned long tx;
 149         unsigned int tx_next;
 150         unsigned int mapped_addr;
 151         unsigned long flags;
 152
 153         if (priv->plat->min_pkt_len) {
 154                 if (skb->len < priv->plat->min_pkt_len) {
 155                         if (skb_padto(skb, priv->plat->min_pkt_len)) {
 156                                 printk(KERN_ERR
 157                                        "ramips_eth: skb_padto failed\n");
 158                                 kfree_skb(skb);
 159                                 return 0;
 160                         }
 161                         skb_put(skb, priv->plat->min_pkt_len - skb->len);
 162                 }
 163         }
 164
 165         dev->trans_start = jiffies;
 166         mapped_addr = (unsigned int) dma_map_single(NULL, skb->data, skb->len,
 167                                                     DMA_TO_DEVICE);
 168         dma_sync_single_for_device(NULL, mapped_addr, skb->len, DMA_TO_DEVICE);
 169         spin_lock_irqsave(&priv->page_lock, flags);
 170         tx = ramips_fe_rr(RAMIPS_TX_CTX_IDX0);
 171         if (tx == NUM_TX_DESC - 1)
 172                 tx_next = 0;
 173         else
 174                 tx_next = tx + 1;
 175
 176         if ((priv->tx_skb[tx]) || (priv->tx_skb[tx_next]) ||
 177             !(priv->tx[tx].txd2 & TX_DMA_DONE) ||
 178             !(priv->tx[tx_next].txd2 & TX_DMA_DONE))
 179                 goto out;
 180
 181         priv->tx[tx].txd1 = mapped_addr;
 182         priv->tx[tx].txd2 &= ~(TX_DMA_PLEN0_MASK | TX_DMA_DONE);
 183         priv->tx[tx].txd2 |= TX_DMA_PLEN0(skb->len);
 184         dev->stats.tx_packets++;
 185         dev->stats.tx_bytes += skb->len;
 186         priv->tx_skb[tx] = skb;
 187         wmb();
 188         ramips_fe_wr((tx + 1) % NUM_TX_DESC, RAMIPS_TX_CTX_IDX0);
 189         spin_unlock_irqrestore(&priv->page_lock, flags);
 190         return NETDEV_TX_OK;
 191
 192  out:
 193         spin_unlock_irqrestore(&priv->page_lock, flags);
 194         dev->stats.tx_dropped++;
 195         kfree_skb(skb);
 196         return NETDEV_TX_OK;
 197 }
 198
 199 static void
 200 ramips_eth_rx_hw(unsigned long ptr)
 201 {
 202         struct net_device *dev = (struct net_device *) ptr;
 203         struct raeth_priv *priv = netdev_priv(dev);
 204         int rx;
 205         int max_rx = 16;
 206
 207         while (max_rx) {
 208                 struct sk_buff *rx_skb, *new_skb;
 209
 210                 rx = (ramips_fe_rr(RAMIPS_RX_CALC_IDX0) + 1) % NUM_RX_DESC;
 211                 if (!(priv->rx[rx].rxd2 & RX_DMA_DONE))
 212                         break;
 213                 max_rx--;
 214
 215                 rx_skb = priv->rx_skb[rx];
 216                 rx_skb->len = RX_DMA_PLEN0(priv->rx[rx].rxd2);
 217                 rx_skb->dev = dev;
 218                 rx_skb->protocol = eth_type_trans(rx_skb, dev);
 219                 rx_skb->ip_summed = CHECKSUM_NONE;
 220                 dev->stats.rx_packets++;
 221                 dev->stats.rx_bytes += rx_skb->len;
 222                 netif_rx(rx_skb);
 223
 224                 new_skb = netdev_alloc_skb(dev, MAX_RX_LENGTH + 2);
 225                 priv->rx_skb[rx] = new_skb;
 226                 BUG_ON(!new_skb);
 227                 skb_reserve(new_skb, 2);
 228                 priv->rx[rx].rxd1 = dma_map_single(NULL,
 229                                                    new_skb->data,
 230                                                    MAX_RX_LENGTH + 2,
 231                                                    DMA_FROM_DEVICE);
 232                 priv->rx[rx].rxd2 &= ~RX_DMA_DONE;
 233                 wmb();
 234                 ramips_fe_wr(rx, RAMIPS_RX_CALC_IDX0);
 235         }
 236
 237         if (max_rx == 0)
 238                 tasklet_schedule(&priv->rx_tasklet);
 239         else
 240                 ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) | RAMIPS_RX_DLY_INT,
 241                              RAMIPS_FE_INT_ENABLE);
 242 }
 243
 244 static void
 245 ramips_eth_tx_housekeeping(unsigned long ptr)
 246 {
 247         struct net_device *dev = (struct net_device*)ptr;
 248         struct raeth_priv *priv = netdev_priv(dev);
 249
 250         while ((priv->tx[priv->skb_free_idx].txd2 & TX_DMA_DONE) &&
 251                (priv->tx_skb[priv->skb_free_idx])) {
 252                 dev_kfree_skb_irq((struct sk_buff *) priv->tx_skb[priv->skb_free_idx]);
 253                 priv->tx_skb[priv->skb_free_idx] = 0;
 254                 priv->skb_free_idx++;
 255                 if (priv->skb_free_idx >= NUM_TX_DESC)
 256                         priv->skb_free_idx = 0;
 257         }
 258
 259         ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) | RAMIPS_TX_DLY_INT,
 260                      RAMIPS_FE_INT_ENABLE);
 261 }
 262
 263 static int
 264 ramips_eth_set_mac_addr(struct net_device *dev, void *priv)
 265 {
 266         unsigned char *mac = (unsigned char *) priv;
 267
 268         if (netif_running(dev))
 269                 return -EBUSY;
 270
 271         memcpy(dev->dev_addr, ((struct sockaddr*)priv)->sa_data, dev->addr_len);
 272         ramips_fe_wr((mac[0] << 8) | mac[1], RAMIPS_GDMA1_MAC_ADRH);
 273         ramips_fe_wr((mac[2] << 24) | (mac[3] << 16) | (mac[4] << 8) | mac[5],
 274                      RAMIPS_GDMA1_MAC_ADRL);
 275         return 0;
 276 }
 277
 278 static void
 279 ramips_eth_timeout(struct net_device *dev)
 280 {
 281         struct raeth_priv *priv = netdev_priv(dev);
 282
 283         tasklet_schedule(&priv->tx_housekeeping_tasklet);
 284 }
 285
 286 static irqreturn_t
 287 ramips_eth_irq(int irq, void *dev)
 288 {
 289         struct raeth_priv *priv = netdev_priv(dev);
 290         unsigned long fe_int = ramips_fe_rr(RAMIPS_FE_INT_STATUS);
 291
 292         ramips_fe_wr(0xFFFFFFFF, RAMIPS_FE_INT_STATUS);
 293
 294         if (fe_int & RAMIPS_RX_DLY_INT) {
 295                 ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) & ~(RAMIPS_RX_DLY_INT),
 296                              RAMIPS_FE_INT_ENABLE);
 297                 tasklet_schedule(&priv->rx_tasklet);
 298         }
 299
 300         if (fe_int & RAMIPS_TX_DLY_INT)
 301                 ramips_eth_tx_housekeeping((unsigned long)dev);
 302
 303         return IRQ_HANDLED;
 304 }
 305
 306 static int
 307 ramips_eth_open(struct net_device *dev)
 308 {
 309         struct raeth_priv *priv = netdev_priv(dev);
 310         int err;
 311
 312         err = request_irq(dev->irq, ramips_eth_irq, IRQF_DISABLED,
 313                           dev->name, dev);
 314         if (err)
 315                 return err;
 316
 317         err = ramips_alloc_dma(dev);
 318         if (err)
 319                 goto err_free_irq;
 320
 321         ramips_setup_dma(dev);
 322         ramips_fe_wr((ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) & 0xff) |
 323                 (RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN |
 324                 RAMIPS_TX_DMA_EN | RAMIPS_PDMA_SIZE_4DWORDS),
 325                 RAMIPS_PDMA_GLO_CFG);
 326         ramips_fe_wr((ramips_fe_rr(RAMIPS_FE_GLO_CFG) &
 327                 ~(RAMIPS_US_CYC_CNT_MASK << RAMIPS_US_CYC_CNT_SHIFT)) |
 328                 ((rt305x_sys_freq / RAMIPS_US_CYC_CNT_DIVISOR) << RAMIPS_US_CYC_CNT_SHIFT),
 329                 RAMIPS_FE_GLO_CFG);
 330
 331         tasklet_init(&priv->tx_housekeeping_tasklet, ramips_eth_tx_housekeeping,
 332                      (unsigned long)dev);
 333         tasklet_init(&priv->rx_tasklet, ramips_eth_rx_hw, (unsigned long)dev);
 334
 335         ramips_fe_wr(RAMIPS_DELAY_INIT, RAMIPS_DLY_INT_CFG);
 336         ramips_fe_wr(RAMIPS_TX_DLY_INT | RAMIPS_RX_DLY_INT, RAMIPS_FE_INT_ENABLE);
 337         ramips_fe_wr(ramips_fe_rr(RAMIPS_GDMA1_FWD_CFG) &
 338                 ~(RAMIPS_GDM1_ICS_EN | RAMIPS_GDM1_TCS_EN | RAMIPS_GDM1_UCS_EN | 0xffff),
 339                 RAMIPS_GDMA1_FWD_CFG);
 340         ramips_fe_wr(ramips_fe_rr(RAMIPS_CDMA_CSG_CFG) &
 341                 ~(RAMIPS_ICS_GEN_EN | RAMIPS_TCS_GEN_EN | RAMIPS_UCS_GEN_EN),
 342                 RAMIPS_CDMA_CSG_CFG);
 343         ramips_fe_wr(RAMIPS_PSE_FQFC_CFG_INIT, RAMIPS_PSE_FQ_CFG);
 344         ramips_fe_wr(1, RAMIPS_FE_RST_GL);
 345         ramips_fe_wr(0, RAMIPS_FE_RST_GL);
 346
 347         netif_start_queue(dev);
 348         return 0;
 349
 350  err_free_irq:
 351         free_irq(dev->irq, dev);
 352         return err;
 353 }
 354
 355 static int
 356 ramips_eth_stop(struct net_device *dev)
 357 {
 358         struct raeth_priv *priv = netdev_priv(dev);
 359
 360         ramips_fe_wr(ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) &
 361                      ~(RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN | RAMIPS_TX_DMA_EN),
 362                      RAMIPS_PDMA_GLO_CFG);
 363         free_irq(dev->irq, dev);
 364         netif_stop_queue(dev);
 365         tasklet_kill(&priv->tx_housekeeping_tasklet);
 366         tasklet_kill(&priv->rx_tasklet);
 367         ramips_cleanup_dma(dev);
 368         printk(KERN_DEBUG "ramips_eth: stopped\n");
 369         return 0;
 370 }
 371
 372 static int __init
 373 ramips_eth_probe(struct net_device *dev)
 374 {
 375         struct raeth_priv *priv = netdev_priv(dev);
 376         struct sockaddr addr;
 377
 378         BUG_ON(!priv->plat->reset_fe);
 379         priv->plat->reset_fe();
 380         net_srandom(jiffies);
 381         memcpy(addr.sa_data, priv->plat->mac, 6);
 382         ramips_eth_set_mac_addr(dev, &addr);
 383
 384         ether_setup(dev);
 385         dev->mtu = 1500;
 386         dev->watchdog_timeo = TX_TIMEOUT;
 387         spin_lock_init(&priv->page_lock);
 388
 389         return 0;
 390 }
 391
 392 static const struct net_device_ops ramips_eth_netdev_ops = {
 393         .ndo_init               = ramips_eth_probe,
 394         .ndo_open               = ramips_eth_open,
 395         .ndo_stop               = ramips_eth_stop,
 396         .ndo_start_xmit         = ramips_eth_hard_start_xmit,
 397         .ndo_tx_timeout         = ramips_eth_timeout,
 398         .ndo_change_mtu         = eth_change_mtu,
 399         .ndo_set_mac_address    = ramips_eth_set_mac_addr,
 400         .ndo_validate_addr      = eth_validate_addr,
 401 };
 402
 403 static int
 404 ramips_eth_plat_probe(struct platform_device *plat)
 405 {
 406         struct raeth_priv *priv;
 407         struct ramips_eth_platform_data *data = plat->dev.platform_data;
 408         struct resource *res;
 409         int err;
 410
 411         if (!data) {
 412                 dev_err(&plat->dev, "no platform data specified\n");
 413                 return -EINVAL;
 414         }
 415
 416         res = platform_get_resource(plat, IORESOURCE_MEM, 0);
 417         if (!res) {
 418                 dev_err(&plat->dev, "no memory resource found\n");
 419                 return -ENXIO;
 420         }
 421
 422         ramips_fe_base = ioremap_nocache(res->start, res->end - res->start + 1);
 423         if (!ramips_fe_base)
 424                 return -ENOMEM;
 425
 426         ramips_dev = alloc_etherdev(sizeof(struct raeth_priv));
 427         if (!ramips_dev) {
 428                 dev_err(&plat->dev, "alloc_etherdev failed\n");
 429                 err = -ENOMEM;
 430                 goto err_unmap;
 431         }
 432
 433         strcpy(ramips_dev->name, "eth%d");
 434         ramips_dev->irq = platform_get_irq(plat, 0);
 435         if (ramips_dev->irq < 0) {
 436                 dev_err(&plat->dev, "no IRQ resource found\n");
 437                 err = -ENXIO;
 438                 goto err_free_dev;
 439         }
 440         ramips_dev->addr_len = ETH_ALEN;
 441         ramips_dev->base_addr = (unsigned long)ramips_fe_base;
 442         ramips_dev->netdev_ops = &ramips_eth_netdev_ops;
 443
 444         priv = netdev_priv(ramips_dev);
 445         priv->plat = data;
 446
 447         err = register_netdev(ramips_dev);
 448         if (err) {
 449                 dev_err(&plat->dev, "error bringing up device\n");
 450                 goto err_free_dev;
 451         }
 452
 453 #ifdef CONFIG_RALINK_RT305X
 454         rt305x_esw_init();
 455 #endif
 456         printk(KERN_DEBUG "ramips_eth: loaded\n");
 457         return 0;
 458
 459  err_free_dev:
 460         kfree(ramips_dev);
 461  err_unmap:
 462         iounmap(ramips_fe_base);
 463         return err;
 464 }
 465
 466 static int
 467 ramips_eth_plat_remove(struct platform_device *plat)
 468 {
 469         unregister_netdev(ramips_dev);
 470         free_netdev(ramips_dev);
 471         printk(KERN_DEBUG "ramips_eth: unloaded\n");
 472         return 0;
 473 }
 474
 475 static struct platform_driver ramips_eth_driver = {
 476         .probe = ramips_eth_plat_probe,
 477         .remove = ramips_eth_plat_remove,
 478         .driver = {
 479                 .name = "ramips_eth",
 480                 .owner = THIS_MODULE,
 481         },
 482 };
 483
 484 static int __init
 485 ramips_eth_init(void)
 486 {
 487         int ret = platform_driver_register(&ramips_eth_driver);
 488         if (ret)
 489                 printk(KERN_ERR
 490                        "ramips_eth: Error registering platfom driver!\n");
 491         return ret;
 492 }
 493
 494 static void __exit
 495 ramips_eth_cleanup(void)
 496 {
 497         platform_driver_unregister(&ramips_eth_driver);
 498 }
 499
 500 module_init(ramips_eth_init);
 501 module_exit(ramips_eth_cleanup);
 502
 503 MODULE_LICENSE("GPL");
 504 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
 505 MODULE_DESCRIPTION("ethernet driver for ramips boards");