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