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