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