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 inline void
  55 ramips_fe_int_disable(u32 mask)
  56 {
  57         ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) & ~mask,
  58                      RAMIPS_FE_INT_ENABLE);
  59         /* flush write */
  60         ramips_fe_rr(RAMIPS_FE_INT_ENABLE);
  61 }
  62
  63 static inline void
  64 ramips_fe_int_enable(u32 mask)
  65 {
  66         ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) | mask,
  67                      RAMIPS_FE_INT_ENABLE);
  68         /* flush write */
  69         ramips_fe_rr(RAMIPS_FE_INT_ENABLE);
  70 }
  71
  72 static void
  73 ramips_cleanup_dma(struct raeth_priv *re)
  74 {
  75         int i;
  76
  77         for (i = 0; i < NUM_RX_DESC; i++)
  78                 if (re->rx_skb[i])
  79                         dev_kfree_skb_any(re->rx_skb[i]);
  80
  81         if (re->rx)
  82                 dma_free_coherent(NULL,
  83                                   NUM_RX_DESC * sizeof(struct ramips_rx_dma),
  84                                   re->rx, re->phy_rx);
  85
  86         if (re->tx)
  87                 dma_free_coherent(NULL,
  88                                   NUM_TX_DESC * sizeof(struct ramips_tx_dma),
  89                                   re->tx, re->phy_tx);
  90 }
  91
  92 static int
  93 ramips_alloc_dma(struct raeth_priv *re)
  94 {
  95         int err = -ENOMEM;
  96         int i;
  97
  98         re->skb_free_idx = 0;
  99
 100         /* setup tx ring */
 101         re->tx = dma_alloc_coherent(NULL,
 102                                     NUM_TX_DESC * sizeof(struct ramips_tx_dma),
 103                                     &re->phy_tx, GFP_ATOMIC);
 104         if (!re->tx)
 105                 goto err_cleanup;
 106
 107         memset(re->tx, 0, NUM_TX_DESC * sizeof(struct ramips_tx_dma));
 108         for (i = 0; i < NUM_TX_DESC; i++) {
 109                 re->tx[i].txd2 = TX_DMA_LSO | TX_DMA_DONE;
 110                 re->tx[i].txd4 = TX_DMA_QN(3) | TX_DMA_PN(1);
 111         }
 112
 113         /* setup rx ring */
 114         re->rx = dma_alloc_coherent(NULL,
 115                                     NUM_RX_DESC * sizeof(struct ramips_rx_dma),
 116                                     &re->phy_rx, GFP_ATOMIC);
 117         if (!re->rx)
 118                 goto err_cleanup;
 119
 120         memset(re->rx, 0, sizeof(struct ramips_rx_dma) * NUM_RX_DESC);
 121         for (i = 0; i < NUM_RX_DESC; i++) {
 122                 struct sk_buff *new_skb = dev_alloc_skb(MAX_RX_LENGTH + 2);
 123
 124                 if (!new_skb)
 125                         goto err_cleanup;
 126
 127                 skb_reserve(new_skb, 2);
 128                 re->rx[i].rxd1 = dma_map_single(NULL,
 129                                                 skb_put(new_skb, 2),
 130                                                 MAX_RX_LENGTH + 2,
 131                                                 DMA_FROM_DEVICE);
 132                 re->rx[i].rxd2 |= RX_DMA_LSO;
 133                 re->rx_skb[i] = new_skb;
 134         }
 135
 136         return 0;
 137
 138  err_cleanup:
 139         ramips_cleanup_dma(re);
 140         return err;
 141 }
 142
 143 static void
 144 ramips_setup_dma(struct raeth_priv *re)
 145 {
 146         ramips_fe_wr(phys_to_bus(re->phy_tx), RAMIPS_TX_BASE_PTR0);
 147         ramips_fe_wr(NUM_TX_DESC, RAMIPS_TX_MAX_CNT0);
 148         ramips_fe_wr(0, RAMIPS_TX_CTX_IDX0);
 149         ramips_fe_wr(RAMIPS_PST_DTX_IDX0, RAMIPS_PDMA_RST_CFG);
 150
 151         ramips_fe_wr(phys_to_bus(re->phy_rx), RAMIPS_RX_BASE_PTR0);
 152         ramips_fe_wr(NUM_RX_DESC, RAMIPS_RX_MAX_CNT0);
 153         ramips_fe_wr((NUM_RX_DESC - 1), RAMIPS_RX_CALC_IDX0);
 154         ramips_fe_wr(RAMIPS_PST_DRX_IDX0, RAMIPS_PDMA_RST_CFG);
 155 }
 156
 157 static int
 158 ramips_eth_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
 159 {
 160         struct raeth_priv *priv = netdev_priv(dev);
 161         unsigned long tx;
 162         unsigned int tx_next;
 163         unsigned int mapped_addr;
 164         unsigned long flags;
 165
 166         if (priv->plat->min_pkt_len) {
 167                 if (skb->len < priv->plat->min_pkt_len) {
 168                         if (skb_padto(skb, priv->plat->min_pkt_len)) {
 169                                 printk(KERN_ERR
 170                                        "ramips_eth: skb_padto failed\n");
 171                                 kfree_skb(skb);
 172                                 return 0;
 173                         }
 174                         skb_put(skb, priv->plat->min_pkt_len - skb->len);
 175                 }
 176         }
 177
 178         dev->trans_start = jiffies;
 179         mapped_addr = (unsigned int) dma_map_single(NULL, skb->data, skb->len,
 180                                                     DMA_TO_DEVICE);
 181         dma_sync_single_for_device(NULL, mapped_addr, skb->len, DMA_TO_DEVICE);
 182         spin_lock_irqsave(&priv->page_lock, flags);
 183         tx = ramips_fe_rr(RAMIPS_TX_CTX_IDX0);
 184         tx_next = (tx + 1) % NUM_TX_DESC;
 185
 186         if ((priv->tx_skb[tx]) || (priv->tx_skb[tx_next]) ||
 187             !(priv->tx[tx].txd2 & TX_DMA_DONE) ||
 188             !(priv->tx[tx_next].txd2 & TX_DMA_DONE))
 189                 goto out;
 190
 191         priv->tx[tx].txd1 = mapped_addr;
 192         priv->tx[tx].txd2 &= ~(TX_DMA_PLEN0_MASK | TX_DMA_DONE);
 193         priv->tx[tx].txd2 |= TX_DMA_PLEN0(skb->len);
 194         dev->stats.tx_packets++;
 195         dev->stats.tx_bytes += skb->len;
 196         priv->tx_skb[tx] = skb;
 197         wmb();
 198         ramips_fe_wr(tx_next, RAMIPS_TX_CTX_IDX0);
 199         spin_unlock_irqrestore(&priv->page_lock, flags);
 200         return NETDEV_TX_OK;
 201
 202  out:
 203         spin_unlock_irqrestore(&priv->page_lock, flags);
 204         dev->stats.tx_dropped++;
 205         kfree_skb(skb);
 206         return NETDEV_TX_OK;
 207 }
 208
 209 static void
 210 ramips_eth_rx_hw(unsigned long ptr)
 211 {
 212         struct net_device *dev = (struct net_device *) ptr;
 213         struct raeth_priv *priv = netdev_priv(dev);
 214         int rx;
 215         int max_rx = 16;
 216
 217         while (max_rx) {
 218                 struct sk_buff *rx_skb, *new_skb;
 219
 220                 rx = (ramips_fe_rr(RAMIPS_RX_CALC_IDX0) + 1) % NUM_RX_DESC;
 221                 if (!(priv->rx[rx].rxd2 & RX_DMA_DONE))
 222                         break;
 223                 max_rx--;
 224
 225                 rx_skb = priv->rx_skb[rx];
 226                 rx_skb->len = RX_DMA_PLEN0(priv->rx[rx].rxd2);
 227                 rx_skb->dev = dev;
 228                 rx_skb->protocol = eth_type_trans(rx_skb, dev);
 229                 rx_skb->ip_summed = CHECKSUM_NONE;
 230                 dev->stats.rx_packets++;
 231                 dev->stats.rx_bytes += rx_skb->len;
 232                 netif_rx(rx_skb);
 233
 234                 new_skb = netdev_alloc_skb(dev, MAX_RX_LENGTH + 2);
 235                 priv->rx_skb[rx] = new_skb;
 236                 BUG_ON(!new_skb);
 237                 skb_reserve(new_skb, 2);
 238                 priv->rx[rx].rxd1 = dma_map_single(NULL,
 239                                                    new_skb->data,
 240                                                    MAX_RX_LENGTH + 2,
 241                                                    DMA_FROM_DEVICE);
 242                 priv->rx[rx].rxd2 &= ~RX_DMA_DONE;
 243                 wmb();
 244                 ramips_fe_wr(rx, RAMIPS_RX_CALC_IDX0);
 245         }
 246
 247         if (max_rx == 0)
 248                 tasklet_schedule(&priv->rx_tasklet);
 249         else
 250                 ramips_fe_int_enable(RAMIPS_RX_DLY_INT);
 251 }
 252
 253 static void
 254 ramips_eth_tx_housekeeping(unsigned long ptr)
 255 {
 256         struct net_device *dev = (struct net_device*)ptr;
 257         struct raeth_priv *priv = netdev_priv(dev);
 258
 259         while ((priv->tx[priv->skb_free_idx].txd2 & TX_DMA_DONE) &&
 260                (priv->tx_skb[priv->skb_free_idx])) {
 261                 dev_kfree_skb_irq(priv->tx_skb[priv->skb_free_idx]);
 262                 priv->tx_skb[priv->skb_free_idx] = 0;
 263                 priv->skb_free_idx++;
 264                 if (priv->skb_free_idx >= NUM_TX_DESC)
 265                         priv->skb_free_idx = 0;
 266         }
 267
 268         ramips_fe_int_enable(RAMIPS_TX_DLY_INT);
 269 }
 270
 271 static int
 272 ramips_eth_set_mac_addr(struct net_device *dev, void *priv)
 273 {
 274         unsigned char *mac = priv;
 275
 276         if (netif_running(dev))
 277                 return -EBUSY;
 278
 279         memcpy(dev->dev_addr, ((struct sockaddr*)priv)->sa_data, dev->addr_len);
 280         ramips_fe_wr((mac[0] << 8) | mac[1], RAMIPS_GDMA1_MAC_ADRH);
 281         ramips_fe_wr((mac[2] << 24) | (mac[3] << 16) | (mac[4] << 8) | mac[5],
 282                      RAMIPS_GDMA1_MAC_ADRL);
 283         return 0;
 284 }
 285
 286 static void
 287 ramips_eth_timeout(struct net_device *dev)
 288 {
 289         struct raeth_priv *priv = netdev_priv(dev);
 290
 291         tasklet_schedule(&priv->tx_housekeeping_tasklet);
 292 }
 293
 294 static irqreturn_t
 295 ramips_eth_irq(int irq, void *dev)
 296 {
 297         struct raeth_priv *priv = netdev_priv(dev);
 298         unsigned long fe_int = ramips_fe_rr(RAMIPS_FE_INT_STATUS);
 299
 300         ramips_fe_wr(0xFFFFFFFF, RAMIPS_FE_INT_STATUS);
 301
 302         if (fe_int & RAMIPS_RX_DLY_INT) {
 303                 ramips_fe_int_disable(RAMIPS_RX_DLY_INT);
 304                 tasklet_schedule(&priv->rx_tasklet);
 305         }
 306
 307         if (fe_int & RAMIPS_TX_DLY_INT)
 308                 ramips_eth_tx_housekeeping((unsigned long)dev);
 309
 310         return IRQ_HANDLED;
 311 }
 312
 313 static int
 314 ramips_eth_open(struct net_device *dev)
 315 {
 316         struct raeth_priv *priv = netdev_priv(dev);
 317         int err;
 318
 319         err = request_irq(dev->irq, ramips_eth_irq, IRQF_DISABLED,
 320                           dev->name, dev);
 321         if (err)
 322                 return err;
 323
 324         err = ramips_alloc_dma(priv);
 325         if (err)
 326                 goto err_free_irq;
 327
 328         ramips_setup_dma(priv);
 329         ramips_fe_wr((ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) & 0xff) |
 330                 (RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN |
 331                 RAMIPS_TX_DMA_EN | RAMIPS_PDMA_SIZE_4DWORDS),
 332                 RAMIPS_PDMA_GLO_CFG);
 333         ramips_fe_wr((ramips_fe_rr(RAMIPS_FE_GLO_CFG) &
 334                 ~(RAMIPS_US_CYC_CNT_MASK << RAMIPS_US_CYC_CNT_SHIFT)) |
 335                 ((priv->plat->sys_freq / RAMIPS_US_CYC_CNT_DIVISOR) << RAMIPS_US_CYC_CNT_SHIFT),
 336                 RAMIPS_FE_GLO_CFG);
 337
 338         tasklet_init(&priv->tx_housekeeping_tasklet, ramips_eth_tx_housekeeping,
 339                      (unsigned long)dev);
 340         tasklet_init(&priv->rx_tasklet, ramips_eth_rx_hw, (unsigned long)dev);
 341
 342         ramips_fe_wr(RAMIPS_DELAY_INIT, RAMIPS_DLY_INT_CFG);
 343         ramips_fe_wr(RAMIPS_TX_DLY_INT | RAMIPS_RX_DLY_INT, RAMIPS_FE_INT_ENABLE);
 344         ramips_fe_wr(ramips_fe_rr(RAMIPS_GDMA1_FWD_CFG) &
 345                 ~(RAMIPS_GDM1_ICS_EN | RAMIPS_GDM1_TCS_EN | RAMIPS_GDM1_UCS_EN | 0xffff),
 346                 RAMIPS_GDMA1_FWD_CFG);
 347         ramips_fe_wr(ramips_fe_rr(RAMIPS_CDMA_CSG_CFG) &
 348                 ~(RAMIPS_ICS_GEN_EN | RAMIPS_TCS_GEN_EN | RAMIPS_UCS_GEN_EN),
 349                 RAMIPS_CDMA_CSG_CFG);
 350         ramips_fe_wr(RAMIPS_PSE_FQFC_CFG_INIT, RAMIPS_PSE_FQ_CFG);
 351         ramips_fe_wr(1, RAMIPS_FE_RST_GL);
 352         ramips_fe_wr(0, RAMIPS_FE_RST_GL);
 353
 354         netif_start_queue(dev);
 355         return 0;
 356
 357  err_free_irq:
 358         free_irq(dev->irq, dev);
 359         return err;
 360 }
 361
 362 static int
 363 ramips_eth_stop(struct net_device *dev)
 364 {
 365         struct raeth_priv *priv = netdev_priv(dev);
 366
 367         ramips_fe_wr(ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) &
 368                      ~(RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN | RAMIPS_TX_DMA_EN),
 369                      RAMIPS_PDMA_GLO_CFG);
 370         free_irq(dev->irq, dev);
 371         netif_stop_queue(dev);
 372         tasklet_kill(&priv->tx_housekeeping_tasklet);
 373         tasklet_kill(&priv->rx_tasklet);
 374         ramips_cleanup_dma(priv);
 375         printk(KERN_DEBUG "ramips_eth: stopped\n");
 376         return 0;
 377 }
 378
 379 static int __init
 380 ramips_eth_probe(struct net_device *dev)
 381 {
 382         struct raeth_priv *priv = netdev_priv(dev);
 383         struct sockaddr addr;
 384
 385         BUG_ON(!priv->plat->reset_fe);
 386         priv->plat->reset_fe();
 387         net_srandom(jiffies);
 388         memcpy(addr.sa_data, priv->plat->mac, 6);
 389         ramips_eth_set_mac_addr(dev, &addr);
 390
 391         ether_setup(dev);
 392         dev->mtu = 1500;
 393         dev->watchdog_timeo = TX_TIMEOUT;
 394         spin_lock_init(&priv->page_lock);
 395
 396         return 0;
 397 }
 398
 399 static const struct net_device_ops ramips_eth_netdev_ops = {
 400         .ndo_init               = ramips_eth_probe,
 401         .ndo_open               = ramips_eth_open,
 402         .ndo_stop               = ramips_eth_stop,
 403         .ndo_start_xmit         = ramips_eth_hard_start_xmit,
 404         .ndo_tx_timeout         = ramips_eth_timeout,
 405         .ndo_change_mtu         = eth_change_mtu,
 406         .ndo_set_mac_address    = ramips_eth_set_mac_addr,
 407         .ndo_validate_addr      = eth_validate_addr,
 408 };
 409
 410 static int
 411 ramips_eth_plat_probe(struct platform_device *plat)
 412 {
 413         struct raeth_priv *priv;
 414         struct ramips_eth_platform_data *data = plat->dev.platform_data;
 415         struct resource *res;
 416         int err;
 417
 418         if (!data) {
 419                 dev_err(&plat->dev, "no platform data specified\n");
 420                 return -EINVAL;
 421         }
 422
 423         res = platform_get_resource(plat, IORESOURCE_MEM, 0);
 424         if (!res) {
 425                 dev_err(&plat->dev, "no memory resource found\n");
 426                 return -ENXIO;
 427         }
 428
 429         ramips_fe_base = ioremap_nocache(res->start, res->end - res->start + 1);
 430         if (!ramips_fe_base)
 431                 return -ENOMEM;
 432
 433         ramips_dev = alloc_etherdev(sizeof(struct raeth_priv));
 434         if (!ramips_dev) {
 435                 dev_err(&plat->dev, "alloc_etherdev failed\n");
 436                 err = -ENOMEM;
 437                 goto err_unmap;
 438         }
 439
 440         strcpy(ramips_dev->name, "eth%d");
 441         ramips_dev->irq = platform_get_irq(plat, 0);
 442         if (ramips_dev->irq < 0) {
 443                 dev_err(&plat->dev, "no IRQ resource found\n");
 444                 err = -ENXIO;
 445                 goto err_free_dev;
 446         }
 447         ramips_dev->addr_len = ETH_ALEN;
 448         ramips_dev->base_addr = (unsigned long)ramips_fe_base;
 449         ramips_dev->netdev_ops = &ramips_eth_netdev_ops;
 450
 451         priv = netdev_priv(ramips_dev);
 452         priv->plat = data;
 453
 454         err = register_netdev(ramips_dev);
 455         if (err) {
 456                 dev_err(&plat->dev, "error bringing up device\n");
 457                 goto err_free_dev;
 458         }
 459
 460 #ifdef CONFIG_RALINK_RT305X
 461         rt305x_esw_init();
 462 #endif
 463         printk(KERN_DEBUG "ramips_eth: loaded\n");
 464         return 0;
 465
 466  err_free_dev:
 467         kfree(ramips_dev);
 468  err_unmap:
 469         iounmap(ramips_fe_base);
 470         return err;
 471 }
 472
 473 static int
 474 ramips_eth_plat_remove(struct platform_device *plat)
 475 {
 476         unregister_netdev(ramips_dev);
 477         free_netdev(ramips_dev);
 478         printk(KERN_DEBUG "ramips_eth: unloaded\n");
 479         return 0;
 480 }
 481
 482 static struct platform_driver ramips_eth_driver = {
 483         .probe = ramips_eth_plat_probe,
 484         .remove = ramips_eth_plat_remove,
 485         .driver = {
 486                 .name = "ramips_eth",
 487                 .owner = THIS_MODULE,
 488         },
 489 };
 490
 491 static int __init
 492 ramips_eth_init(void)
 493 {
 494         int ret = platform_driver_register(&ramips_eth_driver);
 495         if (ret)
 496                 printk(KERN_ERR
 497                        "ramips_eth: Error registering platfom driver!\n");
 498         return ret;
 499 }
 500
 501 static void __exit
 502 ramips_eth_cleanup(void)
 503 {
 504         platform_driver_unregister(&ramips_eth_driver);
 505 }
 506
 507 module_init(ramips_eth_init);
 508 module_exit(ramips_eth_cleanup);
 509
 510 MODULE_LICENSE("GPL");
 511 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
 512 MODULE_DESCRIPTION("ethernet driver for ramips boards");