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 <eth.h>
  28
  29 #define TX_TIMEOUT (20 * HZ / 100)
  30 #define MAX_RX_LENGTH   1500
  31
  32 #ifdef CONFIG_RALINK_RT305X
  33 #include "ramips_esw.c"
  34 #endif
  35
  36 #define phys_to_bus(a)  (a & 0x1FFFFFFF)
  37
  38 static struct net_device * ramips_dev;
  39 static void __iomem *ramips_fe_base = 0;
  40
  41 static inline void
  42 ramips_fe_wr(u32 val, unsigned reg)
  43 {
  44         __raw_writel(val, ramips_fe_base + reg);
  45 }
  46
  47 static inline u32
  48 ramips_fe_rr(unsigned reg)
  49 {
  50         return __raw_readl(ramips_fe_base + reg);
  51 }
  52
  53 static void
  54 ramips_cleanup_dma(struct net_device *dev)
  55 {
  56         struct raeth_priv *priv = netdev_priv(dev);
  57         int i;
  58
  59         for (i = 0; i < NUM_RX_DESC; i++)
  60                 if (priv->rx_skb[i])
  61                         dev_kfree_skb_any(priv->rx_skb[i]);
  62
  63         if (priv->rx)
  64                 dma_free_coherent(NULL,
  65                                   NUM_RX_DESC * sizeof(struct ramips_rx_dma),
  66                                   priv->rx, priv->phy_rx);
  67
  68         if (priv->tx)
  69                 dma_free_coherent(NULL,
  70                                   NUM_TX_DESC * sizeof(struct ramips_tx_dma),
  71                                   priv->tx, priv->phy_tx);
  72 }
  73
  74 static int
  75 ramips_alloc_dma(struct net_device *dev)
  76 {
  77         struct raeth_priv *priv = netdev_priv(dev);
  78         int err = -ENOMEM;
  79         int i;
  80
  81         priv->skb_free_idx = 0;
  82
  83         /* setup tx ring */
  84         priv->tx = dma_alloc_coherent(NULL,
  85                 NUM_TX_DESC * sizeof(struct ramips_tx_dma), &priv->phy_tx, GFP_ATOMIC);
  86         if (!priv->tx)
  87                 goto err_cleanup;
  88
  89         for(i = 0; i < NUM_TX_DESC; i++)
  90         {
  91                 memset(&priv->tx[i], 0, sizeof(struct ramips_tx_dma));
  92                 priv->tx[i].txd2 |= TX_DMA_LSO | TX_DMA_DONE;
  93                 priv->tx[i].txd4 &= (TX_DMA_QN_MASK | TX_DMA_PN_MASK);
  94                 priv->tx[i].txd4 |= TX_DMA_QN(3) | TX_DMA_PN(1);
  95         }
  96
  97         /* setup rx ring */
  98         priv->rx = dma_alloc_coherent(NULL,
  99                 NUM_RX_DESC * sizeof(struct ramips_rx_dma), &priv->phy_rx, GFP_ATOMIC);
 100         if (!priv->rx)
 101                 goto err_cleanup;
 102
 103         memset(priv->rx, 0, sizeof(struct ramips_rx_dma) * NUM_RX_DESC);
 104         for(i = 0; i < NUM_RX_DESC; i++)
 105         {
 106                 struct sk_buff *new_skb = dev_alloc_skb(MAX_RX_LENGTH + 2);
 107
 108                 if (!new_skb)
 109                         goto err_cleanup;
 110
 111                 skb_reserve(new_skb, 2);
 112                 priv->rx[i].rxd1 =
 113                         dma_map_single(NULL, skb_put(new_skb, 2), MAX_RX_LENGTH + 2,
 114                                 DMA_FROM_DEVICE);
 115                 priv->rx[i].rxd2 |= RX_DMA_LSO;
 116                 priv->rx_skb[i] = new_skb;
 117         }
 118
 119         return 0;
 120
 121  err_cleanup:
 122         ramips_cleanup_dma(dev);
 123         return err;
 124 }
 125
 126 static void
 127 ramips_setup_dma(struct net_device *dev)
 128 {
 129         struct raeth_priv *priv = netdev_priv(dev);
 130
 131         ramips_fe_wr(phys_to_bus(priv->phy_tx), RAMIPS_TX_BASE_PTR0);
 132         ramips_fe_wr(NUM_TX_DESC, RAMIPS_TX_MAX_CNT0);
 133         ramips_fe_wr(0, RAMIPS_TX_CTX_IDX0);
 134         ramips_fe_wr(RAMIPS_PST_DTX_IDX0, RAMIPS_PDMA_RST_CFG);
 135
 136         ramips_fe_wr(phys_to_bus(priv->phy_rx), RAMIPS_RX_BASE_PTR0);
 137         ramips_fe_wr(NUM_RX_DESC, RAMIPS_RX_MAX_CNT0);
 138         ramips_fe_wr((NUM_RX_DESC - 1), RAMIPS_RX_CALC_IDX0);
 139         ramips_fe_wr(RAMIPS_PST_DRX_IDX0, RAMIPS_PDMA_RST_CFG);
 140 }
 141
 142 static int
 143 ramips_eth_hard_start_xmit(struct sk_buff* skb, struct net_device *dev)
 144 {
 145         struct raeth_priv *priv = netdev_priv(dev);
 146         unsigned long tx;
 147         unsigned int tx_next;
 148         unsigned int mapped_addr;
 149         if(priv->plat->min_pkt_len)
 150         {
 151                 if(skb->len < priv->plat->min_pkt_len)
 152                  {
 153                      if(skb_padto(skb, priv->plat->min_pkt_len))
 154                          {
 155                                  printk(KERN_ERR "ramips_eth: skb_padto failed\n");
 156                                  kfree_skb(skb);
 157                                  return 0;
 158                          }
 159                      skb_put(skb, priv->plat->min_pkt_len - skb->len);
 160                  }
 161         }
 162         dev->trans_start = jiffies;
 163         mapped_addr = (unsigned int)dma_map_single(NULL, skb->data, skb->len,
 164                         DMA_TO_DEVICE);
 165         dma_sync_single_for_device(NULL, mapped_addr, skb->len, DMA_TO_DEVICE);
 166         tx = ramips_fe_rr(RAMIPS_TX_CTX_IDX0);
 167         if(tx == NUM_TX_DESC - 1)
 168                 tx_next = 0;
 169         else
 170                 tx_next = tx + 1;
 171         if((priv->tx_skb[tx]== 0) && (priv->tx_skb[tx_next] == 0))
 172         {
 173                 if(!(priv->tx[tx].txd2 & TX_DMA_DONE))
 174                 {
 175                         kfree_skb(skb);
 176                         dev->stats.tx_dropped++;
 177                         printk(KERN_ERR "%s: dropping\n", dev->name);
 178                         return 0;
 179                 }
 180                 priv->tx[tx].txd1 = virt_to_phys(skb->data);
 181                 priv->tx[tx].txd2 &= ~(TX_DMA_PLEN0_MASK | TX_DMA_DONE);
 182                 priv->tx[tx].txd2 |= TX_DMA_PLEN0(skb->len);
 183                 ramips_fe_wr((tx + 1) % NUM_TX_DESC, RAMIPS_TX_CTX_IDX0);
 184                 dev->stats.tx_packets++;
 185                 dev->stats.tx_bytes += skb->len;
 186                 priv->tx_skb[tx] = skb;
 187                 ramips_fe_wr((tx + 1) % NUM_TX_DESC, RAMIPS_TX_CTX_IDX0);
 188         } else {
 189                 dev->stats.tx_dropped++;
 190                 kfree_skb(skb);
 191         }
 192         return 0;
 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->tail = rx_skb->data + rx_skb->len;
 215                 rx_skb->dev = dev;
 216                 rx_skb->protocol = eth_type_trans(rx_skb, dev);
 217                 rx_skb->ip_summed = CHECKSUM_NONE;
 218                 dev->stats.rx_packets++;
 219                 dev->stats.rx_bytes += rx_skb->len;
 220                 netif_rx(rx_skb);
 221
 222                 new_skb = __dev_alloc_skb(MAX_RX_LENGTH + 2, GFP_DMA | GFP_ATOMIC);
 223                 priv->rx_skb[rx] = new_skb;
 224                 BUG_ON(!new_skb);
 225                 skb_reserve(new_skb, 2);
 226                 priv->rx[rx].rxd1 =
 227                         dma_map_single(NULL, new_skb->data, MAX_RX_LENGTH + 2,
 228                         DMA_FROM_DEVICE);
 229                 priv->rx[rx].rxd2 &= ~RX_DMA_DONE;
 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 = ramips_alloc_dma(dev);
 306         if (err)
 307                 return err;
 308
 309         ramips_setup_dma(dev);
 310         ramips_fe_wr((ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) & 0xff) |
 311                 (RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN |
 312                 RAMIPS_TX_DMA_EN | RAMIPS_PDMA_SIZE_4DWORDS),
 313                 RAMIPS_PDMA_GLO_CFG);
 314         ramips_fe_wr((ramips_fe_rr(RAMIPS_FE_GLO_CFG) &
 315                 ~(RAMIPS_US_CYC_CNT_MASK << RAMIPS_US_CYC_CNT_SHIFT)) |
 316                 ((rt305x_sys_freq / RAMIPS_US_CYC_CNT_DIVISOR) << RAMIPS_US_CYC_CNT_SHIFT),
 317                 RAMIPS_FE_GLO_CFG);
 318         request_irq(dev->irq, ramips_eth_irq, IRQF_DISABLED, dev->name, dev);
 319         tasklet_init(&priv->tx_housekeeping_tasklet, ramips_eth_tx_housekeeping,
 320                 (unsigned long)dev);
 321         tasklet_init(&priv->rx_tasklet, ramips_eth_rx_hw, (unsigned long)dev);
 322         ramips_fe_wr(RAMIPS_DELAY_INIT, RAMIPS_DLY_INT_CFG);
 323         ramips_fe_wr(RAMIPS_TX_DLY_INT | RAMIPS_RX_DLY_INT, RAMIPS_FE_INT_ENABLE);
 324         ramips_fe_wr(ramips_fe_rr(RAMIPS_GDMA1_FWD_CFG) &
 325                 ~(RAMIPS_GDM1_ICS_EN | RAMIPS_GDM1_TCS_EN | RAMIPS_GDM1_UCS_EN | 0xffff),
 326                 RAMIPS_GDMA1_FWD_CFG);
 327         ramips_fe_wr(ramips_fe_rr(RAMIPS_CDMA_CSG_CFG) &
 328                 ~(RAMIPS_ICS_GEN_EN | RAMIPS_TCS_GEN_EN | RAMIPS_UCS_GEN_EN),
 329                 RAMIPS_CDMA_CSG_CFG);
 330         ramips_fe_wr(RAMIPS_PSE_FQFC_CFG_INIT, RAMIPS_PSE_FQ_CFG);
 331         ramips_fe_wr(1, RAMIPS_FE_RST_GL);
 332         ramips_fe_wr(0, RAMIPS_FE_RST_GL);
 333         netif_start_queue(dev);
 334         return 0;
 335 }
 336
 337 static int
 338 ramips_eth_stop(struct net_device *dev)
 339 {
 340         struct raeth_priv *priv = netdev_priv(dev);
 341
 342         ramips_fe_wr(RAMIPS_PDMA_GLO_CFG, ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) &
 343                 ~(RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN | RAMIPS_TX_DMA_EN));
 344         free_irq(dev->irq, dev);
 345         netif_stop_queue(dev);
 346         tasklet_kill(&priv->tx_housekeeping_tasklet);
 347         tasklet_kill(&priv->rx_tasklet);
 348         ramips_cleanup_dma(dev);
 349         printk(KERN_DEBUG "ramips_eth: stopped\n");
 350         return 0;
 351 }
 352
 353 static int __init
 354 ramips_eth_probe(struct net_device *dev)
 355 {
 356         struct raeth_priv *priv = netdev_priv(dev);
 357         struct sockaddr addr;
 358
 359         BUG_ON(!priv->plat->reset_fe);
 360         priv->plat->reset_fe();
 361         net_srandom(jiffies);
 362         memcpy(addr.sa_data, priv->plat->mac, 6);
 363         ramips_eth_set_mac_addr(dev, &addr);
 364
 365         ether_setup(dev);
 366         dev->open = ramips_eth_open;
 367         dev->stop = ramips_eth_stop;
 368         dev->hard_start_xmit = ramips_eth_hard_start_xmit;
 369         dev->set_mac_address = ramips_eth_set_mac_addr;
 370         dev->mtu = MAX_RX_LENGTH;
 371         dev->tx_timeout = ramips_eth_timeout;
 372         dev->watchdog_timeo = TX_TIMEOUT;
 373         return 0;
 374 }
 375
 376 static int
 377 ramips_eth_plat_probe(struct platform_device *plat)
 378 {
 379         struct raeth_priv *priv;
 380         struct ramips_eth_platform_data *data = plat->dev.platform_data;
 381         struct resource *res;
 382         int err;
 383
 384         if (!data) {
 385                 dev_err(&plat->dev, "no platform data specified\n");
 386                 return -EINVAL;
 387         }
 388
 389         res = platform_get_resource(plat, IORESOURCE_MEM, 0);
 390         if (!res) {
 391                 dev_err(&plat->dev, "no memory resource found\n");
 392                 return -ENXIO;
 393         }
 394
 395         ramips_fe_base = ioremap_nocache(res->start, res->end - res->start + 1);
 396         if(!ramips_fe_base)
 397                 return -ENOMEM;
 398
 399         ramips_dev = alloc_etherdev(sizeof(struct raeth_priv));
 400         if(!ramips_dev) {
 401                 dev_err(&plat->dev, "alloc_etherdev failed\n");
 402                 err = -ENOMEM;
 403                 goto err_unmap;
 404         }
 405
 406         strcpy(ramips_dev->name, "eth%d");
 407         ramips_dev->irq = platform_get_irq(plat, 0);
 408         if (ramips_dev->irq < 0) {
 409                 dev_err(&plat->dev, "no IRQ resource found\n");
 410                 err = -ENXIO;
 411                 goto err_free_dev;
 412         }
 413         ramips_dev->addr_len = ETH_ALEN;
 414         ramips_dev->base_addr = (unsigned long)ramips_fe_base;
 415         ramips_dev->init = ramips_eth_probe;
 416         priv = (struct raeth_priv*)netdev_priv(ramips_dev);
 417         priv->plat = data;
 418
 419         err = register_netdev(ramips_dev);
 420         if (err) {
 421                 dev_err(&plat->dev, "error bringing up device\n");
 422                 goto err_free_dev;
 423         }
 424
 425 #ifdef CONFIG_RALINK_RT305X
 426         rt305x_esw_init();
 427 #endif
 428         printk(KERN_DEBUG "ramips_eth: loaded\n");
 429         return 0;
 430
 431  err_free_dev:
 432         kfree(ramips_dev);
 433  err_unmap:
 434         iounmap(ramips_fe_base);
 435         return err;
 436 }
 437
 438 static int
 439 ramips_eth_plat_remove(struct platform_device *plat)
 440 {
 441         unregister_netdev(ramips_dev);
 442         free_netdev(ramips_dev);
 443         printk(KERN_DEBUG "ramips_eth: unloaded\n");
 444         return 0;
 445 }
 446
 447 static struct platform_driver ramips_eth_driver = {
 448         .probe = ramips_eth_plat_probe,
 449         .remove = ramips_eth_plat_remove,
 450         .driver = {
 451                 .name = "ramips_eth",
 452                 .owner = THIS_MODULE,
 453         },
 454 };
 455
 456 static int __init
 457 ramips_eth_init(void)
 458 {
 459         int ret = platform_driver_register(&ramips_eth_driver);
 460         if (ret)
 461                 printk(KERN_ERR
 462                        "ramips_eth: Error registering platfom driver!\n");
 463         return ret;
 464 }
 465
 466 static void __exit
 467 ramips_eth_cleanup(void)
 468 {
 469         platform_driver_unregister(&ramips_eth_driver);
 470 }
 471
 472 module_init(ramips_eth_init);
 473 module_exit(ramips_eth_cleanup);
 474
 475 MODULE_LICENSE("GPL");
 476 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
 477 MODULE_DESCRIPTION("ethernet driver for ramips boards");