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